Interlock preventive device for automatic power transmission

Details Interlock preventive device for automatic power transmission Interlock preventive device for automatic power transmission

1978-11-21

1981-12-29

Braun, Leslie

Machine element or mechanism

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

Preselected indexed position

74868, 74878, B60K 4106, B60K 4110

Patent

active

043076319

ABSTRACT:
In a hydraulic control system for an automatic power transmission system, an interlock preventive is provided by one of the two frictional units to be made operative to produce the first gear ratio in the manual forward drive range is forcibly rendered inoperative in the event a third frictional unit is accidentally brought into operative condition due to a failure occurring in the hydraulic control system in which shift valves contributive to the shifting between the first, second and third forward drive gear ratios are arranged in parallel with each other with respect to the fluid circuit through which the fluid pressure to be distributed by one of the shift valves to the third frictional unit is to be directed to the shift valves.

REFERENCES:
patent: 2932990 (1960-04-01), Cartwright et al.
patent: 3158037 (1964-11-01), Searles
patent: 3650162 (1972-03-01), Leising et al.
patent: 3651714 (1972-03-01), Ohya et al.
patent: 3667323 (1972-06-01), Irie
patent: 3813964 (1974-06-01), Ichimura et al.
patent: 3978743 (1976-09-01), Murakami
patent: 4046033 (1977-09-01), Hashimoto et al.
patent: 4111072 (1978-09-01), Harmon et al.
patent: 4111074 (1978-09-01), Northup
patent: 4145937 (1979-03-01), Shindo et al.
patent: 4186627 (1980-02-01), Kuramochi

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