Pressure control device for the actuation of a clutch or brake

Details Pressure control device for the actuation of a clutch or brake Pressure control device for the actuation of a clutch or brake

1981-08-18

1984-09-04

Garrett, Robert E.

Motors: expansible chamber type

With motive fluid valve

Both inlet and exhaust controlled by motive fluid pressure...

91461, 91469, 1376256, 192 52, F15B 13043

Patent

active

044690118

ABSTRACT:
A hydraulic control device for the pressurization of a clutch or the like for a transmission operable under load comprises a spool-type valve displaceable in one direction to pressurize the clutch and in the opposite direction to vent the same. The valve spool operates with a damping piston which receives the clutch pressure buildup and acts against a control piston which, in turn, is displaced by an operative valve. According to the invention, the pressure head is maintained substantially constant by providing a sleeve or bushing within the damping piston chamber which bears against the spool by a spring and which can be biased by a spring between the damping piston and the sleeve.

REFERENCES:
patent: 3559669 (1971-02-01), Dach
patent: 3583422 (1971-06-01), Dach et al.
patent: 3674121 (1972-07-01), Copeland
patent: 3999462 (1976-12-01), Chamberlain
patent: 4111283 (1978-09-01), Hastings, Jr.
patent: 4139015 (1979-02-01), Sakai
patent: 4281676 (1981-08-01), Morris

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