Malfunction prevention device of automotive hydraulic transmissi

Details Malfunction prevention device of automotive hydraulic transmissi Malfunction prevention device of automotive hydraulic transmissi

1982-11-08

1984-12-18

Herrmann, Allan D.

Machine element or mechanism

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

Preselected indexed position

74869, 74878, B60K 4116

Patent

active

044884575

ABSTRACT:
An hydraulic transmission interposed between an engine and the wheels of a vehicle is controlled by hydraulic circuits and hydraulically-operated clutches. A shift valve assembly is supplied with oil pressure in accordance with the extent of opening of the throttle of the engine, as well as vehicle governor pressure acting as a vehicle speed signal. The shift valve assembly not only functions to control operation of hydraulic clutches but also acts as a malfunction-preventive valve which operates to impede engagement of the reverse transmission clutch during forward running of the vehicle at a speed higher than a predetermined vehicle speed, irrespective of the throttle valve opening.

REFERENCES:
patent: 3146630 (1964-09-01), Ivey
patent: 3401581 (1968-09-01), Chana
patent: 3714849 (1973-02-01), Smith
patent: 4290325 (1981-09-01), Nishimura

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