Non-step hydraulic transmission

摘要

A non-step hydraulic transmission is provided which includes a hydraulic pump having a pump cylinder and a plurality of pump plungers slidably fitted into the pump cylinder. The pump plungers are arranged in a circular pattern around the axis of the pump cylinder. A hydraulic motor having a motor cylinder concentrically surrounds the pump cylinder and a plurality of motor plungers are slidably fitted into the motor cylinder. The motor plungers are arranged in a circular pattern around the axis of the motor cylinder. A hydraulic circuit hydraulically couples the pump and the motor and a distribution plate is positioned in the hydraulic circuit between the pump and the motor. The distribution plate is coupled to the motor cylinder and slidably, rotatably contacts an end surface of the pump cylinder. A pump swash plate is fixed to the motor cylinder and moves each of the pump plungers in response to the relative rotation of the motor cylinder and the pump cylinder. A casing houses the hydraulic pump and the hydraulic motor and a motor swash plate is mounted on the casing for moving each of the motor plungers in response to the rotation of the motor cylinder.