`(KK-233.2)
`
`ABSTRACT
`
`A control mechanism for a stepless transmission is a control mechanism connected to a
`
`manipulation lever in a stepless transmission and disposed outside a housing of the transmission. The
`
`control mechanism includes: a) a piston rod connected to the manipulation lever; b) a piston provided
`
`on the piston rod coaXially with the piston rod; c) a cylinder case provided with a cylinder adapted to
`
`house the piston rod and the piston such that the piston rod and the piston are displaceable in an aXial
`
`direction, the piston and the cylinder forming a first fluid chamber to be supplied with a hydraulic
`
`fluid for withdrawing the piston rod from the cylinder and a second fluid chamber to be supplied with
`
`the hydraulic fluid for introducing the piston rod into the cylinder; d) a spring adapted to bias the
`
`manipulation lever in a neutral direction coaXially with the piston rod; e) a proportional pressure
`
`control valve adapted to selectively supply the hydraulic fluid to the first fluid chamber or the second
`
`fluid chamber, the proportional pressure control valves being mounted to the cylinder case; and f) a
`
`pivot shaft adapted to support the cylinder case oscillatably with respect to the housing.
`
`-51-
`
`

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