| 摘要 |
A hydrostatic transaxle apparatus, comprises: a housing filled therein with fluid so as to serve as a fluid sump; an axle disposed in the housing; a first hydraulic displacement unit disposed in the housing, the first hydraulic displacement unit having a rotary shaft serving as an input shaft; a second hydraulic displacement unit disposed in the housing, the second hydraulic displacement unit having a rotary shaft serving as an output shaft drivingly connected to the axle, wherein at least one of the first and second hydraulic displacement units includes a cylinder block fixed on the rotary shaft, the cylinder block and the rotary shaft having a coupling portion therebetween through which the cylinder block and the rotary shaft are coupled to each other, a plurality of axial pistons axially reciprocally fitted into the cylinder block in parallel to the rotary shaft, the plurality of pistons including at least two pistons disposed opposite to each other with respect to a center axis of the rotary shaft, and a swash plate abutting against heads of the plurality of the pistons, wherein each of the pistons has a center axis, and has a diameter that is substantially equal to a length of the center axis thereof, wherein the head of each of the pistons has a sectionally arcuate shape as a part of a circle having a center disposed in section has a semicircular head whose center of curvature is disposed within the center axis of the piston, and wherein a line connected between the centers of the circles of the at least two pistons is passed through the coupling portion; and a center section disposed in the housing, wherein the first and second hydraulic displacement units are mounted onto the center section so as to be fluidly connected to each other.
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