Oil pressure control for automatic transmissions

Details Oil pressure control for automatic transmissions Oil pressure control for automatic transmissions

1992-05-27

1993-11-09

Braun, Leslie A.

192 clutches and power-stop control

Clutches

Operators

192103F, 192106F, 192 358, F16D 2511

Patent

active

052594890

ABSTRACT:
An oil pressure control system for an automatic transmission which is equipped with a clutch including: an oil chamber; a piston adapted to be moved forward by pressure oil fed to the oil chamber; a plurality of friction discs adapted to engage when thrust by the piston; and a check valve assembly adapted to be opened by a centrifugal force, to release the pressure oil from the oil chamber. The control system comprises: an oil passage for feeding and releasing the pressure oil to and from the oil chamber; a limiter for limiting the inflow of the pressure oil into the oil chamber via the oil passage; an idle revolution detector for detecting that the clutch is idly revolving, to output an output signal when it detects the idle revolution; and a command unit made responsive to the output signal of the detector for limiting the inflow of the pressure oil into the clutch via the oil passage.

REFERENCES:
patent: 4473143 (1984-09-01), Windsor
patent: 4792012 (1988-12-01), Morisawa et al.
patent: 4795011 (1989-01-01), Ushijima et al.
patent: 4805750 (1989-02-01), Nitz
patent: 4875561 (1989-10-01), Schneider et al.
patent: 4934218 (1990-06-01), Takase et al.
patent: 5062050 (1991-10-01), Petzold et al.
patent: 5069319 (1991-12-01), Makabe

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