Shifting arrangement for two clutches for the shifting between a

Details Shifting arrangement for two clutches for the shifting between a Shifting arrangement for two clutches for the shifting between a

1987-01-13

1988-02-02

Pekar, John A.

Motor vehicles

Having four wheels driven

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

B60K 1734, B60K 2308

Patent

active

047224142

ABSTRACT:
A shifting arrangement for the shifting between a single-axle standard drive and an all-wheel drive having a first clutch for the locking of a central differential gear and a second clutch for the connecting and disconnecting of one vehicle axle actuated by first and second pressure medium control element respectively against the force of a spring having first and second shift valve respectively controlled by an electronic control unit, to either supply working pressure or relieve from pressure respective control elements. The improvement including a hydraulic identifying valve for bringing the control elements into a mutual interaction. The identifying valve operates, as a function of the working pressure of at least one of the control elements and exclusively during the simultaneous controlling of both shift valves, in such a way that the clutch torque at both clutches increases and decreases approximately to the same extent. As a result, when shifting into a shift step with a balanced all-wheel drive from standard drive, a shifting can first take place for a short time into an intermediate step with a longitudinally locked all-wheel drive for securing the driving stability.

REFERENCES:
patent: 3963035 (1976-06-01), Vinton

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