Hydraulic control for an automatic vehicle transmission

Details Hydraulic control for an automatic vehicle transmission Hydraulic control for an automatic vehicle transmission

1979-07-20

1981-10-27

Braun, Leslie

Machine element or mechanism

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

Preselected indexed position

74867, B60K 4106

Patent

active

042966523

ABSTRACT:
A hydraulic control device for an automatic vehicle transmission includes a main pressure control valve for delivering an engine load-dependent main output pressure for operating actuating components of the vehicle transmission and a pressure-limiting valve for delivering an engine load-dependent, upwardly limited control pressure. The pressure-limiting valve includes a control piston exposed to the control pressure and to the force of a spring opposing the control pressure. The device further has an additional control valve for applying to the main pressure control valve an output pressure which is a function of a vehicle speed-dependent pressure and the control pressure and which is modulated by the control pressure and a higher main input pressure.

REFERENCES:
patent: 3237476 (1966-03-01), Jandasek
patent: 3293935 (1966-12-01), Tuck et al.
patent: 3546973 (1970-12-01), Ohie et al.
patent: 3643527 (1972-02-01), Ohnuma
patent: 3651714 (1972-03-01), Ohya et al.
patent: 3863739 (1975-02-01), Schaefer et al.
patent: 3886820 (1975-06-01), Lentz
patent: 3902380 (1975-09-01), Murakami
patent: 4023444 (1977-05-01), Murakami
patent: 4030381 (1977-06-01), Lalin

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