Fail-safe hydraulic control valves in an automatic transmission

Details Fail-safe hydraulic control valves in an automatic transmission Fail-safe hydraulic control valves in an automatic transmission

1989-01-04

1991-02-26

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

74868, F16H 5900, F16H 6100, F16H 4500

Patent

active

049952854

ABSTRACT:
The first and second emergency control valves are a back up device in case all solenoid valves are in failure (non electrified). When the first and second solenoid valves are all off due to wire disconnection and the like in case the manual valve is at the 3 range, a 1-2 shift valve is constrained by the first emergency control valve, so that the hydraulic control device becomes the third speed mode. In case t#e manual shift lever is at the 2 range and a 2-3 shift valve, the 2-3 shift valve are constrained by the first and the second emergency control valves, so that the hydraulic control device becomes the second speed mode. In case the manual shift lever is at the 1 range, the first emergency control valve is constrained, and the 2-3 shift valve is constrained by the second emergency control valve, so that the hydraulic control device becomes the first speed mode. When the manual valve is at the D range, the fourth speed mode is attained in case the first and second solenoid valves are all off.

REFERENCES:
patent: 4351206 (1982-09-01), Lemieux et al.
patent: 4841816 (1989-06-01), Bullock

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