Control valve system for a four speed ratio automatic transmission including a dual range regulator valve for controlling independently two upshift ratio changes
This patent describes a control system for a four speed automatic transmission for use in a vehicle driveline to deliver torque from an engine to vehicle traction wheels. The transmission has a driving shaft powered by the engine, a driven shaft, multiple ratio gearing establishing multiple torque delivery paths between the driving and driven shafts and fluid pressure operated clutches and brakes adapted to control the relative motion of the elements of the gearing; clutch and brake servo means for activating and deactivating the clutches and brakes to effect speed ratio changes; a fluid pressure source, conduit structure connecting the pressure source with the servo means, multiple ratio shift valve structure including a 1-2 shift valve means and a 3-4 shift valve means in the conduit structure for controlling distribution of pump pressure to the servo means to effect ratio changes, respectively, between a first ratio and a second ratio and between a third ratio and a fourth ratio; a 1-2 accumulator comprising an accumulator cylinder and an accumulator piston cooperating with the cylinder to define 1-2 accumulator chamber, the 1-2 accumulator chamber communicating with the servo means for effecting second speed ratio; and a 3-4 accumulator comprising an accumulator cylinder and an accumulator piston cooperating with the cylinder to define a 3-4 accumulator chamber, the 3-4 accumulator chamber communicating with the servo means for effecting fourth speed ratio.
- Assignee:
- Ford Motor Co., Dearborn, MI
- Patent Number(s):
- US 4633738
- OSTI ID:
- 6949921
- 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
VALVES
VEHICLES
BRAKES
CONTROL SYSTEMS
CYLINDERS
GEARS
HYDRAULICS
PISTONS
PRESSURE CONTROL
PRESSURE REGULATORS
PUMPS
SERVOMECHANISMS
SHAFTS
SPEED REGULATORS
TORQUE
VELOCITY
WHEELS
CONTROL
CONTROL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
FLUID MECHANICS
MACHINE PARTS
MECHANICS
330602* - Vehicle Design Factors- Engine-Transmission Matching