Hydraulic control system for four-wheel drive transfer mechanism

Details Hydraulic control system for four-wheel drive transfer mechanism Hydraulic control system for four-wheel drive transfer mechanism

1982-09-29

1985-03-12

Pekar, John A.

Motor vehicles

Having four wheels driven

With manually operated means for disengaging drive to one or...

74752A, 74869, B60K 1734

Patent

active

045039275

ABSTRACT:
A hydraulic control system for a four-wheel drive transfer mechanism for vehicles, 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 detachably connecting or disconnecting the first and second output shafts, direct-coupling clutch for connecting or disconnecting the input shaft of the reduction gear mechanism and the first output shaft and a reduced-speed drive brake for shifting the reduction gear mechanism into the reduced-speed range. The hydraulic control circuit includes a down-shift timing valve adapted to be operated by the line pressure of the hydraulic control circuit to distribute the pressurized fluid to the respective servomotors of the direct-coupling clutch and the reduced-speed drive brake so as to make the reduced-speed drive brake start engaging before the direct-coupling clutch is disengaged when the line pressure is lower than a predetermined level and to engage the reduced-speed drive brake after the direct-coupling clutch has been disengaged when the line pressure is higher than the predetermined level.

REFERENCES:
patent: 4298085 (1981-11-01), Moroto

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