192 clutches and power-stop control – Transmission control and clutch control – Common control
Patent
1986-03-06
1987-06-30
Bonck, Rodney H.
192 clutches and power-stop control
Transmission control and clutch control
Common control
192 52, 192 871, 192 8713, 192 8719, 192 85R, 74335, 91451, 91518, F16D 2511, F16D 2500
Patent
active
046763490
ABSTRACT:
A fluid pressure control system including a modulating pressure relief valve is normally needed in a power transmission having clutches that require smooth engagement. It is also desirable in many systems to maintain a difference in fluid pressure levels between the fluid in different selected clutches, such as speed range and directional clutches, during initial engagement. This arrangement ensures that the selected directional clutch engages only after the selected speed range clutch engages so that only the selected directional clutch absorbs the inertial load. In order to conserve horsepower, reduce fluid leakage, and thereby improve system efficiency and component reliability, it is also desirable to reduce the fluid pressure levels in the system once the selected clutches are fully engaged. The present fluid pressure control system provides a pressure cutback device which efficiently reduces the fluid pressures in the system to minimal but adequate levels soon after complete engagement of the selected clutches.
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Bonck Rodney H.
Caterpillar Inc.
Testardi David A.
Woloch Anthony N.
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