Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1985-02-19
1986-12-16
Dorner, Kenneth J.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74868, B60K 4104
Patent
active
046287710
ABSTRACT:
The hydraulic control circuit for an automatic transmission includes solenoid-operated clutch pressure valves which selectively connect line pressure to the selected clutch as the winding of the solenoids are energized and de-energized by an electronic control system. A solenoid feed valve and feedback valve operate to connect line pressure to the input port of the several clutch actuator valves, provided the clutch pressures are within certain limits. If these limits are exceeded, line pressure is disconnected from the actuator valves and is applied, instead, automatically and without respect to electronic control, to the clutches that produce a predetermined gear ratio. A coast control valve operates to regulate pressure to a servo that is pressurized at a lower level for low gear ratio operation and at a higher level for reverse drive operation. The coast control valve vents the servo if either of the clutches that produce the predetermined speed ratio are pressurized. A line pressure regulator and boost valve act in combination with an on-off valve whose state is determined by a solenoid. Minimum line pressure is established at a minimum value, determined by the pressure drops across two orifices whose sizes are predetermined, when the solenoid opens line pressure to a vent port. Maximum line pressure is determined by pressure forces developed on a boost valve when the line pressure regulator solenoid closes the boost line to the vent port.
REFERENCES:
patent: 3823621 (1974-07-01), Kubo et al.
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patent: 4308764 (1982-01-01), Kawamoto et al.
patent: 4331046 (1982-05-01), Leonard et al.
patent: 4349088 (1982-09-01), Ito et al.
patent: 4488457 (1984-12-01), Nishimura et al.
patent: 4494423 (1985-01-01), McCarthy
patent: 4501174 (1985-02-01), Sugano
Liang Polung
Person Dennis W.
Pierce Stanley L.
Dorner Kenneth J.
Ford Motor Company
Harrington Donald J.
McKenzie Frank G.
Novais David
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