Control valve system for a four-speed automatic power transmission transaxle
This patent describes a control system for an automatic transmission for an automotive vehicle. The transmission has a torque input shaft, a torque output shaft, a hydrokinetic torque converter with an impeller connected to the torque input shaft and a turbine, and multiple ratio gearing having an input element connected to the turbine and an output element connected to the output shaft; first clutch and brake means for controlling the relative motion of the elements of the gearing to establish and disestablish ratio changes between a fourth speed ratio and a third speed ratio; second clutch and brake means for controlling the relative motion of the elements of the gearing to establish and disestablish ratio changes between a second speed ratio and the third speed ratio; third clutch and brake means for controlling the relative motion of the elements of the gearing to establish and disestablish ratio changes between a first speed ratio and the second speed ratio; fluid pressure actuators for each of the clutch and brake means; a fluid pressure pump; and conduit structure connecting the pump and the actuators including a 1-2 shift valve means for controlling selectively distribution of actuating pressure to the actuator for the third clutch and brake means, a 2-3 shift valve means for controlling selectively distribution of actuating pressure to the actuator for the second clutch and brake means, and a 3-4 shift valve means for controlling selectively distribution of actuating pressure to the actuator for the first clutch and brake means.
- Assignee:
- Ford Motor Co., Dearborn, MI
- Patent Number(s):
- US 4637281
- OSTI ID:
- 7157217
- Resource Relation:
- Patent File Date: Filed date 19 Jul 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MECHANICAL TRANSMISSIONS
CONTROL SYSTEMS
VEHICLES
ACTUATORS
BRAKES
GEARS
PRESSURE CONTROL
SHAFTS
SIGNALS
TORQUE
TURBINES
VALVES
VELOCITY
CONTROL
CONTROL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
MACHINE PARTS
MACHINERY
TURBOMACHINERY
330602* - Vehicle Design Factors- Engine-Transmission Matching