Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1982-09-29
1989-05-09
Wright, Dirk
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74878, 74866, 180247, B60K 4118, B60K 4116
Patent
active
048278076
ABSTRACT:
A hydraulic control system for a four-wheel drive torque transfer mechanism for a vehicle, including an automatic transmission, a transfer mechanism having gear positions of a two-wheel drive direct-coupling mode H.sub.2, a four-wheel drive direct-coupling mode H.sub.4 and a reduced-speed four-wheel drive mode L.sub.4, and a hydraulic control circuit for controlling the transmission and the transfer mechanism. The transfer mechanism includes a reduction gear mechanism, a first output shaft, a second output shaft rotationally connectible to the first output shaft through a link mechanism, a four-wheel drive clutch for releasably coupling the first and second output shafts, a direct-coupling clutch for releasably coupling an input shaft of the reduction gear mechanism with the first output shaft, and a reduction brake for setting the reducing gear mechanism in a gear train of the reduced-speed mode. The hydraulic control circuit includes an inhibitor valve which is supplied with governor pressure and which selectively applies pressurized fluid to one of the servomotors of the direct-coupling clutch and reduction brake while draining the other servomotor, the inhibitor valve feeding pressurized fluid continuedly to the servomotor of the direct-coupling clutch if manual shift of the transfer mechanism selects the mode L.sub.4 when the governor pressure is higher than a predetermined level, and instead feeding pressurized fluid to the servomotor of the reduction brake and draining the servomotor of the direct-coupling clutch when the governor pressure drops below the predetermined level.
REFERENCES:
patent: 4369671 (1983-01-01), Matsumoto et al.
patent: 4444073 (1984-04-01), Moroto et al.
Hayakawa Yoichi
Ito Yasunobu
Sakai Takahiro
Aisin Warner Kabushiki Kaisha
Wright Dirk
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