Attorney Docket No. PK3923598
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`ti
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`PCT/KR2018/015477
`Substitute Specification (Marked-up Copy)
`SDESCRPHONG _ (Formatted:Strikethrough
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`LUBRICATING OILPUMPDEVICE _ URormatted:FontBodne
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`CROSS-REFERENCE TO RELATED APPLICATION
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`This application claims priority to and the benefit of Korean Patent Application No.
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`2017-0183170. filed on Dec. 28. 2017.
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`the disclosure of which is incorporated herein by
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`reference in its entirety.
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`BACKGROUND
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`grosesnsscsecesateen~
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`LFieldoftheInventionnn _ (Formatted:Stkethrougtne
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`The present
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`invention relates to a lubricating oil pump device which supplies a
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`lubricating oil to a variety of machines, and more particularly to a lubricating oil pump device
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`capable of detecting and relieving a high pressure generated while a lubricating oil is supplied.
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`In machines such as an injection molding machine, which injects a resin or a metal, a
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`lathe, or the like, it is necessary to supply a lubricating oil during an operation of a machine.
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`Generally,
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`in a lubricating oil pump device, a lubricating oil pump is used for supplying a
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`lubricating oil to machines such as an injection molding machine, which injects a resin, a metal,
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`or the like. Generally, the lubricating oil pump includes a single piston which discharges a
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`lubricating oil while being repetitively moved forward and backward by pressure application and
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`pressure relief of the lubricating oil and one outlet corresponding to the piston and supplies the
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`Attorney Docket No. PK3923598
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`PCT/KR2018/015477
`Substitute Specification (Marked-up Copy)
`lubricating oil to a lubricating oil pipe W in which a plurality of single metering valves V known
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`as having one shot of discharge amountin a range of 0.03 to 1.5 ml are embeddedin a plurality
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`of parts corresponding thereto.
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`Since the single metering valve V is operated by applying and relieving a pressure of a
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`lubricating oil and discharges the lubricating oil,
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`it
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`is necessary to relieve the pressure.
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`Accordingly, a lubricating oil pump device capable of relieving a pressure is used.
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`A conventional lubricating oil pump device capable of relieving a pressure includes a
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`pump body in which a lubricating oil transfer path and a pressure relief path are formed, a
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`lubricating oil cartridge connected to the lubricating oil transfer path of the pump body, an
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`actuator which movesa piston forward and backward,a relief valve including a shaft, a pressure
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`sensor installed behind the relief valve, and a control portion which controls forward and
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`backward movement of the piston. The conventional lubricating oil pump device measures a
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`pressure at the lubricating oil transfer path in the pump body using the pressure sensor installed
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`behind the relief valve used for adjusting a pressure.
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`In more detail,
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`the conventional
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`lubricating oil pump device senses whether a maximum pressure occurs by using whether the
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`shaft of the relief valve comes into contact with the pressure sensor.
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`When the shaft of the relief valve comes into contact with the pressure sensor,
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`the
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`pressure sensor transmits the contact of the shaft to the control portion and the control portion
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`determines that the maximum pressure occurs in the pump body and controls the actuator to
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`move the piston backward. Also,
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`the piston moved backward by the actuator opens the
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`pressure relief path in the pump body andrelieves a pressure inside the pump body.
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`However, a pressure measuring method used by the conventional lubricating oil pump
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`device has a problem in which a pressure is relieved only when the relief valve is maximally
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`Attorney Docket No. PK3923598
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`PCT/KR2018/015477
`Substitute Specification (Marked-up Copy)
`moved backward by a pressure such that the shaft in the relief valve comes into contact with the
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`pressure sensor. That is, there is a problem in which the piston is moved hindmostand relieves
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`a pressure by opening the pressure relief path only when the pressure inside the pump body
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`reaches a maximum point.
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`In other words, the conventional lubricating oil pump device uses a
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`method of using a safety relief valve which relieves a pressure only when a pressure inside the
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`device reaches a maximum value. However, in this method, since the shaft of the relief valve
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`used for protecting the safety of the pump_is used at a maximally reached pressure is-used-while— .. =
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`doubling as a shaft of a pressure detection sensor which controls a pressure used for each pipe
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`length, when the pressure detection sensor does not work,it is impossible to estimate a particular
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`pressure at which a pressure thereinside may damage the device.
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`In addition, when the pressure
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`is greater than or equal
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`to the particular pressure,
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`it
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`is impossible to relive the pressure
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`thereinside.
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`Also, due to the above problem, the pressure inside the lubricating oil pump device is not
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`appropriately relieved such that the lubricating oil pump device in which a sealing function is
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`very significant may be damaged.
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`Orennaennserenenesemennenneeneneeneseneneeeeseneneeeeseceneeeeee‘N
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`Attorney Docket No . PK3923598
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`PCT/KR2018/015477
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`ecification (Marked-up Copy)
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`Attorney Docket No. PK3923598
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`PCT/KR2018/015477
`Substitute Specification (Marked-up Copy)
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`SUMMARY OF THE INVENTION
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`The present invention is directed to provide a lubricating oil pump device capable of
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`detecting and relieving a high pressure generated while a lubricating oil is supplied.
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`SEES i Formatted: Left, Indent: First line: 0.5", Line spacing:
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`Formatted: Strikethrough
` _to_oneaspect ofthe presentinvention—prevides, thereisprovided a_-
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`lubricating oi] pump device including a pump body (100) and a lubricating oil cartridge (200).
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`Here, the pump body (100) includes a suction portion (111) which is connected to the lubricating
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`oil cartridge (200) and receives a lubricating oil from the lubricating oil cartridge (200), a
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`Attorney Docket No. PK3923598
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`PCT/KR2018/015477
`Substitute Specification (Marked-up Copy)
`discharge portion (112) which is connected to a lubricating oil supply pipe (W) and supplies the
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`lubricating oil to the lubricating oil supply pipe (W), a piston (150) which reciprocates in the
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`pump body (100) to supply the lubricating oil to the pump body (100) from the lubricating oil
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`cartridge (200), a relief valve (160) for adjusting a pressure inside the pump body (100), a
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`pressure sensor (170) for measuring the pressure inside the pump body (100), a control portion
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`(300) which controls an operation of the piston (150) and an operation of the relief valve (160), a
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`first pipe (110) formed between the suction portion (111) and the discharge portion (112),an
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`incoming side check valve which prevents the lubricating oil moved to the first pipe (110)
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`between the suction portion (111) and the discharge portion (112) from flowing backward to the
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`lubricating oil cartridge (200), an outgoing side check valve which prevents the lubricating oil
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`supplied to the lubricating oil supply pipe (W) between the suction portion (111) and the
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`discharge portion (112) from flowing backward to the first_pipe (110),-a second pipe (120)
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`formed betweenthefirst pipe (110) and therelief valve (160), a third pipe (130) formed between
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`the first pipe (110) and the piston (150), and a fourth pipe (140) formed between the first pipe
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`(110) and the pressure sensor (170) and formed between the outgoing side check valve and the
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`lubricating oil supply pipe (W). Here, the pressure sensor (170) senses a pressure inside the
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`pump body (100) through the fourth pipe (140). Here, the relief valve (160) is connected to the
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`first_pipe (110) and the second pipe (120). When the detected pressure exceeds a preset 4
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` WHEEL<
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`pressure_presetbyauser, the control portion (406300) controls an operation ofthe piston(150) _.
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`to open the third pipe (130) using theapressure reliefsignal. i
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`The relief valve (£50160) may includea springand a valve shaft, andthe valve shaft may _
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`include a lubricating oil transfer path for returning the lubricatingoil.
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`Attorney Docket No. PK3923598
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`PCT/KR2018/015477
`Substitute Specification (Marked-up Copy)
`The fourth pipe (140) may be formed in an area adjacent to the discharge portion (112)
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`and may be spaced apart from and parallel to a transfer pipe at which the relief valve (160) is
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`formed.
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`The fourth pipe (140) may be formed in an area adjacent to the discharge portion (112)
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`and may be spaced apart from and perpendicular to a transfer pipe at which therelief valve (160)
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`is formed.
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`#motherAccording toanotheraspectofthe present invention-prevides, thereis provideda_|
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`lubricating oi] pump device including a pump body (100) and a lubricating oil cartridge (200).
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`The pump body (100) includes a suction portion (111) which is connected to the lubricating oil
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`cartridge (200) and receives a lubricating oil from the lubricating oil cartridge (200), a discharge
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`portion (112) which is connected to a lubricating oil supply pipe (W) and supplies the lubricating
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`oil to the lubricating oil supply pipe;(W),—apiston(150) whichreciprocatesinthe pumpbody_..
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`(100) to supply the lubricating oil to the pump body (100) from the lubricating oil cartridge (200),
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`a relief valve (160) for adjusting a pressure inside the pump body (100), a pressure sensor (170)
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`for measuring the pressure inside the pump body (100), a control portion (300) which controls an
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`operation of the piston (150), a first pipe (110) formed between the suction portion (111) and the
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`discharge portion (112),an incoming side check valve which prevents the lubricating oil moved
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`to the first pipe (110) between the suction portion (111) and the discharge portion from flowing
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`backward to the lubricating oil cartridge (200), an outgoing side check valve which prevents the
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`lubricating oil supplied to the lubricating oil supply pipe (W) between the suction portion (111)
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`and the discharge portion (112) from flowing backward to the first pipe (110), —a second pipe
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`(120) formed between the first pipe (110) and the relief valve (450160), a third pipe (130)
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`formed betweenthefirst pipe (110) and the piston (150), and a fourth pipe (140) formed between
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`Attorney Docket No. PK3923598
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`the
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`thi
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`PCT/KR2018/015477
`Substitute Specification (Marked-up Copy)
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`|
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`side check valve and the pressure sensor (440170) and formed — - : Formatted: Strikethrough
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`between the outgoing side check valve and the lubricating oil supply pipe (W). Here,
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`the
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`pressure sensor (170) detects a pressure inside the pump body (100) through the fourth pipe
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`(140) and is configured to transmit a detection signal to the control portion (300) when the
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`valve (160) is connectedto the first pipe (110) and the second pipe (120), and the control portion
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`(300) receives the detection signal from the pressure sensor (405170) and controls an operation
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`Formatted: Strikethrough
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`of the piston (493150)to openthethird pipe(130),
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`The pressure sensor (170) may include a shaft and a pressure sensor which move
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`backward according to a pressure in order to detect a pressure generated by the discharge portion
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`(112) adjacentto the fourth pipe (140) and may transmit a measured pressure value to the control
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`portion (300) to maintain uniform pressure of the discharge portion (112).
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`The pressure detection shaft and pressure sensor may be located on one side surface of
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`the pump body (100) or located in a rear bracket attachment space of the pump body (100).
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`The lubricating oil pump device may further include a pressure detection valve (172)
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`which measures a pressure transferred from the fourth pipe (140) through a spring adjusting
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`screw, which sets a particular pressure, and a mobile shaft. Here, the pressure detection valve
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`(172) may transmit the measured pressure to the pressure sensor (170).
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`A movement distance of the mobile shaft may be adjusted by adjusting the spring
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`adjusting screw of the pressure detection valve (172), and settings of the particular pressure of
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`the pressure detection valve (172) may be changed by adjusting the movement distance of the
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`mobile shaft.
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`Details of other embodiments are included in a detailed description and drawings.
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`Attorney Docket No. PK3923598
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`PCT/KR2018/015477
`Substitute Specification (Marked-upCopy)
`onsets _ (Formatted:Strikethrough
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`BRIEF DESCRIPTION OF THE DRAWINGS
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`The above and other objects, features and advantages of the present invention will = +Formatted:indent:Firstline:3.3chee}
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`thereofwithreferencetotheaccompanyingin detail drawings, in which, _.» (Formatted:Fontcolor:Black .
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`become more apparent to those of ordinary skill in the art by describing exemplary embodiments
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`Attorney Docket No. PK3923598
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`PCT/KR2018/015477
`Substitute Specification (Marked-up Copy)
`FIG. 1 is a front view of a conventional lubricating oil pump device;-
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`FIG. 2 is a perspective view of a lubricating oil pump device according to the present
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`invention;-
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`FIG. 3 is a cross-sectional view of a lubricating oil pump device according to one
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`embodimentof the present invention;;
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`FIG. 4 is a cross-sectional view of a lubricating oil pump device according to another
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`embodimentof the present invention;and-
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`FIG. 5 is a flowchart illustrating controlling, by a control portion, of the lubricating oil
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`pump device accordingto the present invention.
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`Attorney Docket No. PK3923598
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`PCT/KR2018/015477
`Substitute Specification (Marked-up Copy)
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`PMedes-ofthetnvention}
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`DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS
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`SHSN
`Nannnnanannnnanatnnrannnstnananantenanatnananateananesesnssesesnasetesnsnstesnesaseeneene!
`+="! Formatted: Centered
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`The terms or words used in the specification and the claims will not be interpreted while
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`being defined as general or lexical meanings and should be interpreted as meanings and concepts
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`corresponding to the technical concept of
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`the present
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`invention.
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`Accordingly,
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`since
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`embodiments disclosed in the specification and components shown in the drawings are merely
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`exemplary embodiments of the present invention and do not represent an entirety of the technical
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`concept of the present invention,
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`it should be understood that a variety of equivalents and
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`modifications capable of substituting the embodiments and the components maybepresent at the
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`timeof filing of the presents application.
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`FIG. 1 is a front view of a conventional lubricating oil pump device.
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`Referring to FIG. 1, conventional lubricating oil pump devices each include, as shown in
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`FIG. 1, a tank 2 which accommodates a lubricating oil formed of grease, a tank mounting portion
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`3 which is installed above a pump body 10 and on which the tank 2 is mounted, and a cover
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`mounted on the tank mounting portion 3 to cover the tank 2. The tank 2 is an axially retractile
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`resinouscartridge container, and a male screw 5a is formed at an opening portion 5. The tank
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`mounting portion 3 includes a female screw portion 6 with which the male screw 5a of the
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`opening portion 5 of the tank 2 is coupled to be mounted thereon. Also, the tank mounting
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`portion 3 includes a guide pipe 7 which is inserted into the opening portion 5 of the tank 2
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`Attorney Docket No. PK3923598
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`PCT/KR2018/015477
`Substitute Specification (Marked-up Copy)
`
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`leads the lubricating oil in the tank 2 to an inlet 11 of the pump body 10.
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`The pump body 10 includes, as shown in FIG. 1, a suction path 12 which suctions in the
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`lubricating oil stored in the tank 2 through the inlet 11 and a discharge path 14 which discharges
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`the suctioned lubricating oil through an outlet 13. The inlet 11 is open above the pump body 10
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`and is connected to the guide pipe 7.
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`4 Formatted: Strikethrough
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`Also, the outlet 13 is open below the pump body 10. Also, a lubricating oil pipeWisi
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`connected to the outlet 13.
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`Also, the pump body 10 includes a base end portion 15a located at a first side surface 10a
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`10
`of the pump body 10 and a cylinder portion 15 having an axial line inalateral direction. A fore
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`end portion 15b of the cylinder portion 15 includes an introduction hole 16 which communicates
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`with the suction path 12 and introduces the lubricating oil from the suction path 12, and an
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`elicitation hole 17 which communicates with the discharge path 14 andelicits the lubricating oil
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`toward the discharge path 14. Also, a body portion 15c which forms the cylinder portion 15 is
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`formed as a cylindrical member and engages with a hole 18 formed in the pump body 10.
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`An inlet check valve 19 which allows only suction is installed ahead of the introduction
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`hole 16, and an outlet check valve 20 which allows only discharge is installed behind the
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`elicitation hole 17.
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`The outlet check valve 20 includes a valve body-24. The valve body 24+-includes a.:
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`metallic head 23formed having aconic supportshapeformedat a fore endofa rod-22, a rubber_. -
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`O-ring 24-continuously installed at a baseend of the head 23-andfitting onthe rod—22, and a .-
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`outlet check valve 20 includes a metallic sealing surface portion 26-whichisinstalled nextto the_
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`12
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`Attorney Docket No. PK3923598
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`PCT/KR2018/015477
`Substitute Specification (Marked-up Copy)
`elicitation hole 17 of the cylinder portion 15 and comes into contact with or is separated from the
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`head 23-and O-ring24-ofthevalvebody+,aguideportion24+-whichsupportstherod 22-of the__x
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`head 23-and O-ring 24-are separated from the sealing surface portion-26, anda coil spring 28.
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`and the O-ring 24-againstthesealingsurfaceportion26.
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`According to the outlet check valve 20, since the metallic head 23-andthe rubber O-ring_
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`24comeinto contact with the sealing surface portion 26-such that the rubber O-ring24is joined
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`pristoseSoe\
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`SOS
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`valve body 24-tobe movable inanaxialdirection and includesa slit-shapedpath27a ~x
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`as
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`x)
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`passinethrough which the lubricating oil discharged from the elicitation hole 17passes when the
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`which is mounted between the guide portion Zand thepushmember 25-andpressesthe head23 :
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`yaokcls
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`to the metallic sealing surface portion 26-inadditionto metallicjoining between the head23-and_ AD
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`the sealing surface portion—26,sealingis ensuredthat muchanda countercurrentis certainly SEE
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`suppressed whenthe lubricating oil is absorbed through the introduction hole 16 so as to easily
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`perform an operation.
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`In the cylinder portion 15, a piston 30 is inserted to be movable forward and backward.
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`The piston 30 suctions the lubricating oil from the introduction hole 16 while moving backward
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`and discharges the lubricating oil from the elicitation hole 17 while moving forward. A rear
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`side portion 31 of the piston 30 protrudes outward from the base end 15a of the cylinder portion
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`15 (that is, the side surface 10a of the pump body 10) andis linked with an actuator 40 even
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`whenthe piston 30 moves forward.
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`The actuator 40, as shown in FIG. 1, moves the piston 30 forward or backward,
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`introduces the lubricating oil from the introduction hole 16 of the cylinder portion 15 while the
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`piston 30 moves backward and elicits the lubricating oil from the elicitation hole 17 of the
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`cylinder portion 15 while the piston moves forward.
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`In more detail, the actuator 40 includes an
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`Attorney Docket No. PK3923598
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`PCT/KR2018/015477
`Substitute Specification (Marked-up Copy)
`electric motor 41 capable of rotating forward and backward.
`Theelectric motor 41 includes a
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`driving shaft 43 rotating through a gear speed-reduction tool 42 and is fixed to a leg portion 44
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`erected on the first side surface 10a of the pump body 10 such that an axial line of the driving
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`shaft 43 is parallel to an axial line of the piston 30. At the driving shaft 43 of the electric motor
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`41, a screw shaft 45 on the same axis extends. A fore end portion of the screw shaft 45 is
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`rotatably supported at the first side surface 10a of the pump body 10 using a bearing 46. Also,
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`the actuator 40 includes a link member 47 which engages with the screw shaft 45 andis fixed to
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`and linked with the rear side portion 31 of the piston 30.
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`The link member 47 is slidably supported at two guide shafts 48 and is moved forward
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`and backward by forward and backward rotation of the screw shaft 45 so as to move the piston
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`30 forward and backward. Due to forward and backward movement of the piston 30, a
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`lubricating oil is supplied to a lubricant pipe4-connected tothe outlet 13 and the outlet 13 is
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`pressurized whenthe lubricating oil is supplied.
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`geSEE<
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`Also,
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`the piston 30 is movable to move forward to a first position P+—-which is an
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`_-~ (Formatted:Strikethrougn
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`advancing end of a fore end 32 of the piston 30 which moves forward andelicits the lubricating
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`oil, to a second position P2-at which the piston 30 is movedbackward fromthefirst positionPE
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`and absorbs the lubricating oil, and to a third position P3-at which the piston 30 is moved
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`backward from the second positionP2. Also, the pumpbody 10 includesa pressurerelief path _
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`50 formed therein, which is closed by the piston 30 when the piston 30 moves betweenthefirst
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`position Ptandthe second position P2-andis opened bythe piston 30 whenthe piston 30is
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`moved backward to the third position-P3. Accordingly, when supplyingof the lubricating oil =
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`through the lubricating oil pipe is stopped, the piston 30 may be moved backward to the third
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`position P3-and a pressure atthe outlet 13mayberemoved.§2
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`Attorney Docket No. PK3923598
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`PCT/KR2018/015477
`Substitute Specification (Marked-up Copy)
`In more detail, as shown in FIG. 1, a first through hole 51 and a second through hole 52
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`are formed in the cylinder portion 15 of the pump body 10.
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`Thefirst through hole 51 and the
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`second through hole 52 are closed by the piston 30 when the piston 30 moves between thefirst
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`position Pt-andthe secondpositionP2-and are openedwhenthe piston30moves backwardto. -
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`the third position-P3.__Also, afirst path 53, which connects the first through hole 51 to the
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`discharge path 14, and a second path 54, which connects the second through hole 52 to the
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`suction path 12, are formed in the pump body 10. Accordingly, the pressure relief path 50
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`which passes the discharge path 14,the first path 53, the cylinder portion 15, and the second path
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`54 and reaches the suction path 12 when the piston 30 moves backwardto the third position P3-
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`may be formed.
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`FIGS. 2 and 3 are front and side views of a lubricating oi] pump device according to one
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`embodimentof the present invention.
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`The lubricating oil pump device, as shown in FIGS. 2 and 3, includes a pump body 100
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`and a lubricating oil cartridge 200.
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`Schematically, the lubricating oil pump device stores a
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`lubricating oil in the lubricating oil cartridge 200 and supplies and discharges the lubricating oil
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`stored in the lubricating oil cartridge 200 through a lubricating oil pipe formed in the pump body
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`100. Also, the lubricating oil pipe is connected to a discharge portion 112 of the lubricating oil
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`pump device, and the lubricating oil discharged from the discharge portion 112 is supplied into
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`an injection molding device through the lubricating oil pipe and a metering valve V.
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`Additionally, the lubricating oil pump device includesa fixing clip for fixing the device to a wall
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`or another device.
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`A lubricating oil supply device according to one embodiment of the present invention
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`TSSx
`_© (Formatted:Strikethroughee
`includes the pump body 100 includingafirst pipe 110, a second pipe 120, third pipes 43+-and
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`Attorney Docket No. PK3923598
`
`PCT/KR2018/015477
`Substitute Specification (Marked-up Copy)
`432130, and a fourth pipe 140, the lubricating oil cartridge 200 installed on the pump body 100
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`to be connected to one end ofthe first pipe 110 and including a tank storing a lubricating oil and
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`a housing covering the tank, a piston 150 moving forward and backward while repetitively
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`opening andclosingthe third pipes+3+-ead+432130 andtransferringthelubricating oil througha. ~
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`hubricatine-otttransterthe first pipe 110, an actuator 155 moving the piston forward or backward,
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`a relief valve 160 installed at a connecting part between the feurthfirstpipe440110andtheother_
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`JES
`- (Formatted:Strikethroughcee
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`end of the second pipe 120, a pressure sensor 170 formed at one end of the fourth pipe 140 to
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`measure a pressure of the lubricating oil in the pump body 100, and a control portion 300
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`controlling the actuator 155 and the relief valve 160 on the basis of information transmitted from
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`the pressure sensor 170. Also, the pump body 100 may be connected to a plurality of such
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`metering valves V through a lubricating oil pipe W.
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`The pump body 100 includesa suction portion 111 for receiving the lubricating oil stored
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`in the lubricating oil cartridge 200 and the discharge portion 112 for discharging the suctioned
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`lubricating oil. The suction portion 111 is disposed above the pump body 100, the discharge
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`portion 112 is disposed below the pump body 100, andthe first pipe 110 is formed between the
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`suction portion 111 and the discharge portion 112 to transfer the lubricating oil while passing
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`through the pump body. Also, at the suction portion 111 and the discharge portion 112, an
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`incoming-side check valve is installed to prevent the lubricating oil movedto the first pipe 110
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`from flowing backward to the lubricating oil cartridge 200, and an outgoing-side check valve is
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`installed to prevent the lubricating oil supplied to the lubricating oil supply pipe W from flowing
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`backwardto the first pipe 110.
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`Thefirst pipe 110 is connected to the second pipe 120, the third
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`pipe 130, and the fourth pipe 140. The second pipe 120 connects a transfer pipe of the relief
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`valve 160 located at a branch ofthe first pipe 110 to the first pipe 110 with the relief valve 160
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`Attorney Docket No. PK3923598
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`PCT/KR2018/015477
`Substitute Specification (Marked-up Copy)
`therebetween so as to allow thefirst pipe 110 and the second pipe 120 to communicate with each
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`other only when a shaft of the relief valve 160 is moved hindmost due to occurrence of a
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`maximum pressure.
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`The third pipe 130 may includeafirst pressure relief pipe 131 connected to one side of
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`the first pipe 110 and a second pressure relief pipe 132 connected to the other side of the first
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`pipe 110. The first pressure relief pipe 131 and the second pressure relief pipe 132 may be
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`connected to each other or not connected depending on a position of a shaft of the piston 150.
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`In more detail, the piston 150 is movable to be located at a first position which is a maximum
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`advancing point of the shaft of the piston 150 which moves forward andelicits the lubricating oil,
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`a second position which is a maximum retreat point of an action of absorbing the lubricating oil
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`while moving backward from the first position, and a third position which is a point where the
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`shaft of the piston 150 moves back again from the second position and may open the first
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`pressure relief pipe 131 and the second pressure relief pipe 132. Also, the pump body 100
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`includes a third pipe 130 formed therein, which is closed by the piston 150 when the piston 150
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`moves betweenthe first position and the second position and is opened by the piston 150 when
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`the piston 150 is moved backwardto the third position-P3. Accordingly, when supplying of the
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`lubricating oil
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`through the lubricating oil pipe is stopped,
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`the piston 150 may be moved
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`backward to the third position and a pressure at the discharge portion 112 mayberelieved.
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`The fourth pipe 140 is one of branchesof the first pipe 110 and may be formed adjacent
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`to the discharge portion 112 in order to measure a pressure applied to the discharge portion 112.
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`The fourth pipe 140may be formedto be spacedto be parallel to or perpendicular to a movement
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`pipe at whichtherelief valve 160 is located. The fourth pipe 140 is a pipe formed to measure a
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`Attorney Docket No. PK3923598
`
`PCT/KR2018/015477
`Substitute Specification (Marked-up Copy)
`level of the pressure applied to the pump, and a pressure sensor 170 may be formed at an end of
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`the corresponding pipe.
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`The piston 150 is inserted into the pump body 100 and reciprocates forward and
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`backward along an operation path formed in the pump body 100.
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`Since the piston 150
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`reciprocates forward and backward in the pump body 100,the lubricating oil is absorbed into the
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`first pipe 110 of the pump body 100 through the suction portion 111 from the lubricating oil
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`cartridge 200 and is discharged into the lubricating oil supply pipe W through the discharge
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`portion 112.
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`In more detail, when the piston 150 moves backward to the second position, the
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`lubricating oil is absorbed into the first pipe 110from the lubricating oil cartridge_200. When
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`the piston 150 moves forward to the first position, the lubricating oil of the first pipe_110 is
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`discharged into the lubricating oil
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`supply pipe W through the discharge portion 112.
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`Reciprocation of the piston 463150may becontrolled bythe control portion 300 and maybe» i
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`installed to be located at three or more positions (for example, the first position, the second
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`position, and the third position). As described above, when reciprocation is performed between
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`the first position and the second position, the reciprocating oil is pumped and supplied to the
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`lubricating oil supply pipe W through the first pipe 110. When moving backward to the third
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`position, the pressure in the pump may berelieved by opening the third pipe_130. The piston
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`150 may be operated by the actuator 155.
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`The actuator 155 may include an electric motor and the like capable of rotating forward
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`or backward. The electric motor has a driving shaft rotated by a gear speed reduction tool and
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`is disposed such that a shaft line of a shaft is parallel to an axial line of the piston 150. A
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`coaxial screw shaft 151 may be installed at and extend from the driving shaft of the electric
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`Attorney Docket No. PK3923598
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`PCT/KR2018/015477
`Substitute Specification (Marked-up Copy)
`motor. The actuator 155 may include a link member which is engaged with the screw shaft 151
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`andis fixed and linked to a rear side part of the piston 150.
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`The link member may be supported to be slidable by two guide shafts and may be moved
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`forward and backward by forward and backward rotation of the screw shaft 151 to move the
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`piston 150 forward and backward.
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`The relief valve 160 is inserted into the pump body 100 and is generally installed for
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`adjusting a pressure of the pump body 100.
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`Therelief valve 160 is connected to oneside of the
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`first pipe 110 and is located between the first pipe 110 and the second pipe 120 to return the
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`lubricating oil to the suction portion 111 and/or the first pipe 110.
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`Therelief valve 160 includes
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`a valve shaft and a spring, and a lubricating oil transfer path for returning the lubricating oil is
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`formed in the valve shaft.
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`In more detail, in an operation ofthe relief valve 160, the relief valve
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`160 stays in place after being moved forward maximally by the spring when a pressure is not
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`present in the pump body 100 and is moved behind the valve shaft of the relief valve 160 when a
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`pressure increases in the pump body 100. Whentherelief valve 160 has been moved behind
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`maximally by the pressure inside the pump body 100, the lubricating oil transfer path formed in
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`the relief valve 160 is connected to the second pipe 120 and the lubricating oil of the first pipe
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`110 is returned through the lubricating oil transfer path and the second pipe 120 of the relief
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`valve 160. The lubricating oil
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`is returned such that
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`the pressure in the pump body 100
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`decreases.
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`The pressure sensor 170 is inserted in