Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1982-12-27
1985-09-17
Braun, Leslie A.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74864, B60K 4104
Patent
active
045413088
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: 3448640 (1979-06-01), Nelson
patent: 3680411 (1972-08-01), Ito et al.
patent: 3688607 (1972-09-01), Marlow
patent: 3703109 (1972-01-01), Irie
patent: 3719096 (1973-03-01), Sprague et al.
patent: 3721136 (1973-03-01), Irie
patent: 3726157 (1973-04-01), Marumo
patent: 3752011 (1973-08-01), Casey et al.
patent: 3754482 (1973-08-01), Sanders et al.
patent: 3813964 (1974-06-01), Ichimura et al.
patent: 3823621 (1974-07-01), Kubo et al.
patent: 3937108 (1976-02-01), Will
patent: 3956947 (1976-05-01), Leising et al.
patent: 4023443 (1977-05-01), Usui et al.
patent: 4034627 (1977-07-01), Mizote
patent: 4034628 (1977-07-01), Sakai et al.
patent: 4056991 (1977-01-01), Sakai et al.
patent: 4082013 (1978-04-01), Dorufield
patent: 4094211 (1978-06-01), Espenschied
patent: 4102222 (1978-07-01), Miller et al.
patent: 4106368 (1978-08-01), Ivey
patent: 4145937 (1979-03-01), Shindo et al.
patent: 4290322 (1981-09-01), Huitema
patent: 4494423 (1985-01-01), McCarthy et al.
Liang Polung
Person Dennis W.
Pierce Stanley L.
Braun Leslie A.
Ford Motor Company
Harrington Donald J.
McKenzie Frank G.
Novais David A.
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