Patent ID: 8727743

Claim:
An opposing swash plate piston pump/motor in which a first swash plate and a second swash plate are disposed on either side of a cylinder block, a plurality of cylinders are disposed in the cylinder block on a circumference centering on a central axis of the cylinder block and parallel to the central axis of the cylinder block, a first piston and a second piston are inserted opposite to each other in each cylinder, the first piston slides on the first swash plate, and the second piston slides on the second swash plate such that the first piston and the second piston enlarge and reduce a respective volume within the respective cylinders, the piston pump/motor comprising: a servo mechanism that tilts the first swash plate; and a tilt linking mechanism that tilts the second swash plate in conjunction with tilting of the first swash plate, comprising: a slide bar supported to be capable of displacing in only an orthogonal direction to a plane formed by the central axis of the cylinder block, a tilt central axis of the first swash plate, and a tilt central axis of the second swash plate; a first engagement pin that is fixed to the first swash plate in parallel with the tilt central axis of the first swash plate, the first engagement pin engaging the first swash plate with the slide bar so that the first swash plate is capable of rocking with respect to the slide bar and displacing in an axial direction of the slide bar; and a second engagement pin that is fixed to the second swash plate in parallel with the tilt central axis of the second swash plate, the second engagement pin engaging the second swash plate with the slide bar so that the second swash plate is capable of rocking with respect to the slide bar and displacing in the axial direction of the slide bar, the second engagement pin being disposed on an opposite side of the tilt central axis of the second swash plate to the cylinder block, wherein the slide bar engages with the first swash plate via a notch that holds the first engagement pin to be capable of displacing in the axial direction of the slide bar, and engages with the second swash plate via a notch that holds the second engagement pin to be capable of displacing in the axial direction of the slide bar.