192 clutches and power-stop control – Clutch and brake
Patent
1991-06-04
1992-04-21
Bonck, Rodney H.
192 clutches and power-stop control
Clutch and brake
60413, 91459, 13762564, 13762568, 192109F, F16D 6704, F16D 2514
Patent
active
051059290
ABSTRACT:
A hydraulic modulation valve for use in conjuction with a tractor power-takeoff shaft to prevent an instantaneous loading of the hydraulic clutch controlling the operation of the power-takeoff shaft is disclosed wherein the supply line leading from the valve spool to the hydraulic clutch is in flow communication with a modulation chamber. A yieldable spring-loaded piston is moved within the modulation chamber from an initial position to an operating position to allow the hydraulic pressure to increase from zero pressure to a working pressure for the hydraulic clutch. A bypass line bleeds hydraulic fluid from the inlet end of the modulation chamber to slow the rate at which hydraulic pressure is increased within the modulation chamber. The movable piston closes off the inlet opening to the bypass line when in the initial position adjacent the inlet end of the modulation chamber to permit an initial rapid increase of hydraulic pressure, while the piston closes off the outlet opening of the bypass line when reaching the operating position to permit the working pressure within the modulation chamber to remain constant.
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Emmadi Ramakrishna
Schmid David R.
Bonck Rodney H.
Ford New Holland Inc.
Miller Larry W.
Seemar Frank A.
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