Hydraulic clutch for motor vehicles, having creep-inhibiting fea

Details Hydraulic clutch for motor vehicles, having creep-inhibiting fea Hydraulic clutch for motor vehicles, having creep-inhibiting fea

1985-07-15

1987-09-29

Bonck, Rodney H.

192 clutches and power-stop control

Clutches

Axially engaging

192 85AA, 192113B, F16D 1372, F16D 25061, F16D 2514

Patent

active

046963839

ABSTRACT:
A frictionally engaging device for power transmission of a vehicle, has a first pressure chamber defined in part by one side of a piston urging frictionally engaging elements into engagement with each other, and a second pressure chamber defined in part by the other side of the piston for accommodating the frictionally engaging elements. A hydraulic pressure control arrangement controls operating fluid pressure supplied to the first pressure chamber at least to a value higher than a first predetermined value which causes engagement of the frictionally engaging elements and to a second predetermined value lower than the first predetermined value, which inhibits creeping of the frictionally engaging elements. When the operating fluid pressure is lower than the second predetermined value, a first valve opens to allow escape of the operating fluid from the second pressure chamber to the first pressure chamber. When the operating fluid pressure is at least lower than the first predetermined value, a second valve opens to permit flow of the operating fluid from the first pressure chamber to the second pressure chamber, to thereby cool the frictionally engaging elements.

REFERENCES:
patent: 2642844 (1953-06-01), Flinn
patent: 2837192 (1958-06-01), Dunkelow
patent: 3064780 (1962-11-01), Richards et al.
patent: 3677381 (1972-07-01), Takagi et al.
patent: 4271951 (1981-06-01), Nishimura et al.
patent: 4513638 (1985-04-01), Nishikawa et al.

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