Importance

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Abstract

A hydrostatic transmission including a hydraulic pump and a hydraulic motor fluidly connected with each other, being immersed in an oil sump formed in a housing. A pair of oil passages for fluidly connecting the hydraulic pump with the hydraulic motor are formed in a center section on which the hydraulic pump and the hydraulic motor are mounted. The center section is provided on an outer surface thereof with a pair of openings of the respective oil passages. A control arm is disposed in the housing so as to interlock with a pump capacity changing member like a movable swash plate, thereby enabling the pump capacity changing member to be moved to various actuation positions including a neutral position in association with rotation of the control arm rotated to various actuation positions including a neutral position. A contact member having a surface abutting against the pair of openings of the center section is formed integrally with the control arm. A pair of oil passages are provided in the contact member. The pair of oil passages in the contact member are shut from the oil sump and open on the surface of the contact member. The pair of oil passages in the contact member communicate with the respective openings of the center section when the control arm is located in a certain range including the neutral position. An orifice is provided in the contact member so as to connect the pair of oil passages in the contact member with each other.

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First Claim