Method and apparatus for controlling hydraulic vehicle transmission

Patent · Tue Aug 04 00:00:00 EDT 1987

OSTI ID:6395693

Stark, R A

This patent describes an improved hydraulic control means for a vehicle transmission including a speed clutch and direction clutches, a hydraulic fluid reservoir, a hydraulic pump connected to the reservoir, a pressure regulator connected to the pump, and manually operable selector valve means connected to the regulator and with the direction clutches for directing hydraulic fluid to the speed clutch and direction clutches in accordance with the direction and speed desired for the vehicle. The improvement comprises: sequence valve means connected to the selector valve means and connected with the clutches, the sequence valve means including a shuttle valve receiving hydraulic fluid from the selector valve means and a spool valve connected with the shuttle valve with the reservoir. With the speed clutch, the shuttle valve connects between the spool valve and direction clutches. The spool valve dumps pressure fluid from the speed clutch into the reservoir for inactivating the speed clutch when in a bleed position and supplies pressure fluid to the speed clutch for actuating the speed clutch when moved to a pressure position; and, the spool valve is moved into the pressure position by pressure fluid in the shuttle valve after one direction clutch is activated and biased into the bleed position by a resilient member.

• Assignee: Dresser Industries, Inc., Dallas, TX
• Patent Number(s): US 4684004
• OSTI ID: 6395693
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
CONTROL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
FLUIDS
HYDRAULIC CONTROL DEVICES
HYDRAULIC FLUIDS
MACHINE PARTS
MECHANICAL TRANSMISSIONS
PRESSURE REGULATORS
PUMPS
SPEED REGULATORS
VALVES
VEHICLES
VELOCITY
WORKING FLUIDS