Transmission control system with separate shift timing control pressure supply passage

Patent · Tue Aug 25 00:00:00 EDT 1987

OSTI ID:6091944

Sakai, T; Minemoto, I

This patent describes an automatic transmission, for a gear transmission mechanism comprising first and second hydraulic pressure actuated friction engaging devices which comprise respective first and second pressure chambers. The gear transmission mechanism provides a certain lower speed stage when the first friction engaging device is engaged by supply of actuating hydraulic fluid pressure to the first pressure chamber and the second friction engaging device is disengaged by non-supply of actuating hydraulic fluid pressure to the second pressure chamber, and a certain higher speed stage one speed stage above the certain lower speed stage when the first friction engaging device is disengaged by non-supply of actuating hydraulic fluid pressure to the first pressure chamber and the second friction engaging device is engaged by supply of actuating hydraulic fluid pressure to the second pressure chamber, the second pressure chamber having a hole for passage of hydraulic fluid.

• Assignee: Toyota Jidosha Kabushiki Kaisha, Toyota
• Patent Number(s): US 4668451
• OSTI ID: 6091944
• Country of Publication: United States
• Language: English

Related Subjects

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