Patent ID: 6544137
Filing Date: 2003-04-08
Classification: F16H

Abstract:
A differential device for coupling an input shaft, a first output shaft, and a second output shaft, comprising:a differential case coupled to the input shaft; a first side gear located within said differential case and coupled to the first output shaft; a second side gear located within said differential case and coupled to the second output shaft; a pinion gear located within said differential case, coupled to said first side gear and said second side gear, and adapted to transfer relative rotational movement of said differential case and one of the first and second output shafts into relative rotational movement of said differential case and the other of the first and second output shafts; a hydraulic conduit coupled to said differential case and adapted to transmit a hydraulic fluid; a first rotary pump coupled to said differential case and the first output shaft hydraulic fluid through said hydraulic conduit upon the relative rotational movement of said differential case and the first output shaft and to resist relative rotational movement of said differential case and the first output shaft upon a restriction of the transmittal of hydraulic fluid through said hydraulic conduit; a valve system coupled to said hydraulic conduit and adapted to selectively restrict the transmittal of hydraulic fluid through said hydraulic conduit, thereby selectively causing said first rotary pump to resist relative rotational movement of said differential case and the first output shaft, wherein said valve system includes a pressure relief valve coupled to said hydraulic conduit and adapted to selectively control the maximum pressure of the hydraulic fluid in said hydraulic conduit; and a directional control valve coupled to said hydraulic conduit and adapted to selectively direct hydraulic fluid to said pressure relief valve.