Patent ID: 6474433
Filing Date: 2002-11-05
Classification: B60K,F16D,F16H

Abstract:
A four-wheel-drive vehicle comprising:(a) an engine; (b) a first differential which is driven by said engine to drive one of a front wheel drive system and a rear wheel drive system; (c) a second differential which is drivingly connected to the other one of said front and rear wheel drive systems; and (d) a torque transmission coupling which is provided between said first and second differentials, said torque transmission coupling comprising: (i) an input member driven by said transmission; (ii) an output member drivingly connected to said second differential; (iii) an oil pump drivingly connected to said input member and said output member to generate oil pressure in response to a speed of a relative rotation due to oil pressure supplied to said oil pump corresponding to revolution of said engine; and (iv) a friction clutch mechanism which engages said input shaft and said output shaft with each other by said oil pressure generated by said oil pump, wherein said friction clutch mechanism transmits torque from a ring gear to a differential case of said second differential, and wherein said pump, said friction clutch mechanism and said differential case of said second differential are contained within a first outer housing driven by said ring gear.