Shift signal valve hysteresis

Details Shift signal valve hysteresis Shift signal valve hysteresis

1977-06-09

1978-11-21

Scott, Samuel

Fluid handling

Systems

Multi-way valve unit

74868, 74864, B60K 4118, F15D 102

Patent

active

041261542

ABSTRACT:
A transmission having a plurality of gear ratios which are selectively engaged on the supply of fluid to a servo motor fluid chamber and controls. The controls have a source of fluid under regulated pressure selectively connected by a relay valve respectively in a first and a second position to a first and a second servo motor to provide a first and a second ratio drive, an automatic shift valve controlled by speed and torque demand for shift movement between a first and a second position having spaced lands slidably sealed in a bore and a smaller intermediate restricting portion providing a restricted passage between the bore and restricting portion operative in the first position to restrictively connect the actuator chamber of the relay valve so the relay valve is in first position and in the second position to restrictively connect said source to the actuator chamber of the relay valve to shift the relay valve to second position.

REFERENCES:
patent: 3587355 (1971-06-01), Schaefer
patent: 3886819 (1975-06-01), Lentz
patent: 4036083 (1977-07-01), McQuinn
patent: 4041810 (1977-08-01), Harmon et al.

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