Hydraulic control apparatus for automatic transmissions

Details Hydraulic control apparatus for automatic transmissions Hydraulic control apparatus for automatic transmissions

1989-05-25

1992-02-04

Braun, Leslie A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74866, B60K 4106

Patent

active

050851039

ABSTRACT:
An automatic transmission for an automotive vehicle has a plurality of friction devices for selectively coupling a number of rotary elements in a planetary gear mechanism to one another, and a hydraulic circuit for controlling changeover of the friction devices. The hydraulic circuit includes a regulator valve for generating line pressure, a manual valve for selectively changing over the line pressure to the hydraulic circuit, a plurality of shift solenoids for directly controlling engaging hydraulic pressure of the friction devices by duty control when a shift is made, and a plurality of relay valves controlled by the solenoid valves, wherein the solenoid valves are duty-controlled independently of one another. With such an arrangement, one accumulator is sufficient and the number of valves can be reduced, so that the valve body can be made more compact. In addition, highly precise shock control is possible with regard to all shift conditions.

REFERENCES:
patent: 4488457 (1984-12-01), Nishimura et al.
patent: 4494423 (1985-01-01), McCarthy et al.
patent: 4631982 (1986-12-01), Miki et al.
patent: 4730521 (1988-03-01), Yayasaki et al.
patent: 4753134 (1988-06-01), Hayasaki
patent: 4787258 (1988-11-01), Yamamoto et al.
patent: 4840092 (1989-06-01), Sakaguchi et al.

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