Hydraulic control system for four-wheel drive torque tranfer mec

Details Hydraulic control system for four-wheel drive torque tranfer mec Hydraulic control system for four-wheel drive torque tranfer mec

1982-09-29

1989-04-25

Pate, III, William F.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74152C, 74868, 180247, B60K 4122

Patent

active

048236489

ABSTRACT:
A hydraulic control system for a four-wheel drive torque transfer mechanism for a vehicle, including an automatic transmission, a transfer mechanism having a two-wheel drive direct-coupling gear (H.sub.2), a four-wheel drive direct-coupling gear (H.sub.4) and a reduced-speed four-wheel drive gear (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 connected to the first output shaft by means of a linkage, a four-wheel drive clutch for rotatably connecting and disconnecting the first and second output shafts, a direct-coupling clutch for connecting and disconnecting the input shaft of the reduction gear mechanism and the first output shaft and a reduction brake for shifting the reduction gear mechanism into the reduced-speed mode. The hydraulic control circuit includes a modulator valve capable of supplying a fluid of a reduced pressure when the transfer mechanism is established in the four-wheel drive direct-coupling gear so that the coupling torque of the four-wheel drive clutch is reduced and supplying a fluid of an increased pressure when the transfer mechanism is established in the reduced-speed four-wheel drive gear so that the coupling torque of the four-wheel drive clutch is increased.

REFERENCES:
patent: 3352373 (1967-11-01), Tuck
patent: 3865207 (1975-02-01), Schwab et al.
patent: 3963085 (1976-06-01), Vinton
patent: 3988951 (1976-11-01), Mair et al.
patent: 4274303 (1981-06-01), Shindo et al.
patent: 4292860 (1981-10-01), Kako et al.
patent: 4298085 (1981-11-01), Moroto et al.
patent: 4369671 (1983-01-01), Matsumoto et al.
patent: 4417642 (1983-11-01), Suzuki et al.
patent: 4422349 (1983-12-01), Matsumoto et al.

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