Two-wheel/four-wheel automatic change-over device in automobile

Details Two-wheel/four-wheel automatic change-over device in automobile Two-wheel/four-wheel automatic change-over device in automobile

1987-01-30

1988-11-01

Love, John J.

Motor vehicles

Having four wheels driven

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

180197, 180247, 192103F, B60K 2308

Patent

active

047812664

ABSTRACT:
A two-wheel/four-wheel automatic change-over device in an automobile transfer apparatus is disclosed. In the transfer apparatus in which driving forces are transmitted directly from a transmission to front two wheels or rear two wheels and also transmitted through a wet-type multiple disc clutch to the other two wheels, the two-wheel/four-wheel change-over device has a change-over control unit for changing over from two-wheel drive to four-wheel drive. This unit automatically effects an engagement and a release of a wet-type multiple disc clutch in response to a signal of high speed travelling, a signal of slope travelling, a signal of quick acceleration travelling, a slip signal obtained from a relation between a real car speed and rotation of the wheels and a signal of a selector switch. In such a constitution, the wet-type multiple disc clutch is usually hydraulic-controlled so that it is differentiable in time of the four-wheel travelling. The direct connection type four-wheel drive or the two-wheel drive is performed in accordance with those signals with no time-lag. With this arrangement, a tight corner brake phenomenon can be avoided.

REFERENCES:
patent: 4458557 (1984-07-01), Hayakawa
patent: 4556134 (1985-12-01), Takano

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