Patent ID: 7117672
Filing Date: 2006-10-10
Classification: F16H

Abstract:
1. A hydraulic non-stage transmission comprising: a swash plate plunger pump; a swash plate plunger motor; and a hydraulic closed circuit for connecting a pump discharge port and a pump suction port of said swash plate plunger pump, respectively, to a motor suction port and a motor discharge port of said swash plate plunger motor; wherein a pump swash plate member forming a part of said swash plate plunger pump is driven by receiving an input rotational drive force, a pump cylinder forming a part of said swash plate plunger pump and a motor cylinder forming a part of said swash plate plunger motor are connected to each other and disposed in a connected state on an output shaft, a motor swash plate member forming said swash plate plunger motor is restricted in rotation and the motor swash plate angle can be variably regulated; said output shaft is provided therein with a valve hole extending in the axial direction, a hollow cylindrical valve spool is inserted in said valve hole so as to be rotatable relative to said output shaft; said hydraulic closed circuit includes a plurality of communication oil passages formed in said pump cylinder, said motor cylinder and said output shaft; said valve spool includes a pump-side spool member connected to said pump swash plate member so as to be integrally rotatable and forming an oil passage on the swash plate plunger pump side of said hydraulic closed circuit, and a motor-side spool member restricted in rotation and forming an oil passage on the swash plate plunger motor side of said hydraulic closed circuit.