4WD vehicle torque distribution device incorporating friction en

Details 4WD vehicle torque distribution device incorporating friction en 4WD vehicle torque distribution device incorporating friction en

1987-04-24

1988-08-30

Pekar, John A.

Motor vehicles

Having four wheels driven

With differential means for driving two wheel sets at...

3644241, B60K 1734

Patent

active

047669730

ABSTRACT:
In a four wheel drive vehicle, this torque distribution device includes a friction engaging mechanism which controls drive torque distribution to the front vehicle wheels and/or to the rear vehicle wheels, and a servo device which receives an actuating hydraulic fluid pressure and which applies an engaging force to the friction engaging mechanism so as to cause it to be able to transmit torque. The engaging force for the friction engaging mechanism and the maximum torque transmission capacity thereof this provided both increase monotonically according to increase of the actuating hydraulic fluid pressure. This servo device includes first and second pistons which partially serve to define respective first and second pressure chambers, and which, when impelled by hydraulic fluid pressure in their respective first and second pressure chambers, both provide such engaging force for the friction engaging mechanism. When actuating hydraulic fluid pressure is supplied to two different combinations of the first pressure chamber and the second pressure chamber, the relationships between the magnitude of the engaging hydraulic fluid pressure and the engaging force for the friction engaging mechanism and the maximum torque transmission capacity of the friction engaging mechanism differ. The combinations may be the individual pressure chambers by themselves, or may be one of the chambers and the two of them together. A three stage specialization of this device, and the method of operation thereof, are also described.

REFERENCES:
patent: 4466502 (1984-08-01), Sakai

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