Fail-safe solenoid valve apparatus for controlling oil pressure

Details Fail-safe solenoid valve apparatus for controlling oil pressure Fail-safe solenoid valve apparatus for controlling oil pressure

1992-05-28

1993-04-27

Lorence, Richard M.

Machine element or mechanism

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

Preselected indexed position

74868, F16H 5924

Patent

active

052051927

ABSTRACT:
An apparatus for controlling an oil pressure for a vehicular automatic transmission has an accumulator connected to an oil passage which is in communication with each of clutches for transmission or speed changing; a regulator valve for regulating an oil pressure to be supplied to the hydraulic clutches; a first pressure control valve of electromagnetic type for controlling an output oil pressure of the regulator valve by causing an oil pressure to act thereupon; and a second pressure control valve of electromagnetic type for controlling a back pressure of the accumulator. A drain port of one of the first and second pressure control valves is connected to an oil passage on an output side of the other of the pressure control valves.

REFERENCES:
patent: 4567791 (1986-02-01), Sato
patent: 4625589 (1986-12-01), Nishikawa et al.
patent: 4628771 (1986-12-01), Person et al.
patent: 4691597 (1987-09-01), Leorat et al.
patent: 4843917 (1989-07-01), Van Selous et al.
patent: 4942787 (1990-07-01), Aoki et al.
patent: 4957015 (1990-09-01), Ishikawa et al.
patent: 5012699 (1991-05-01), Aoki et al.

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