System for controlling automatic transmission having communicati

Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position

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Details

74864, 74865, B60K 4106

Patent

active

046337393

ABSTRACT:
The transmission of the invention is capable of attaining a plurality of shift ranges by locking and releasing one or more elements of a gear mechanism to a casing of the transmission or by connecting and releasing the elements with the input shaft, the output shaft or into and out of engagement with each other. The control system for controlling the action of the elements of the gear set is a hydraulic control system having friction elements which achieve a higher speed range and a lower speed range of the transmission upon actuation by servo valves. An additional servo valve is included to work in opposition to one of the other servo valves and communicates with another of the servo valves. A communication control valve is disposed in a hydraulic line which communicates with another of the servo valves and with the servo valve acting in opposition so as to control the communication between these valves in response to a signal pressure developed by a signal pressure valve.

REFERENCES:
patent: 3505910 (1970-04-01), Shimosaki
patent: 3546973 (1970-12-01), Ohie et al.
patent: 3667323 (1972-06-01), Irie
patent: 3710652 (1973-01-01), Miyazaki
patent: 3842693 (1974-10-01), Oberpichler
patent: 4308765 (1982-01-01), Iwanaga et al.
patent: 4334441 (1982-06-01), Iwanaga et al.
patent: 4467675 (1984-08-01), Sugano et al.
patent: 4481877 (1984-11-01), Takano et al.

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