Automatic transmission having hydraulic and electronic control systems

Patent · Tue Jun 23 04:00:00 EDT 1987

OSTI ID:6297646

Furukawa, T; Mori, M

A shifting apparatus is described for a motor vehicle transmission which comprises: a shift actuator including shift shafts, cylinders, springs and select levers; the shift shafts effecting engagement and disengagement of transmission gears to accomplish shift ranges; each of the cylinders comprising one piston and two chambers defined by the piston, the piston being movable to three positions corresponding to the positions of the shift shaft and being actuated to one of the first or second position by applying working pressure to the chambers corresponding to each position; each of the springs urging the pistons to locate at a neutral position defined between the first or second positions; each of the select levers operatively connecting one of the shift shafts with a respective one of the pistons; an electronic control unit for gear shift operation; a hydraulic control unit comprising first, second and third solenoid valves, only the first solenoid valve actuated at a first shift range; the first and second solenoid valves actuated at a second shift range; only the second solenoid valve is actuated at a third shift range, and second and third solenoid valves are actuated at a fourth shift range; the third solenoid valve is actuated at a fifth shift range, no solenoid valve is actuated at a neutral shift range; and a reverse shift range is accomplished by actuating all the three solenoid valves.

• Assignee: Aisin Seik Kabushiki Kaisha, Aichi
• Patent Number(s): US 4674345
• OSTI ID: 6297646
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
ACTUATORS
CONTROL EQUIPMENT
CONTROL SYSTEMS
CYLINDERS
DESIGN
ELECTRIC COILS
ELECTRICAL EQUIPMENT
ELECTRONIC EQUIPMENT
EQUIPMENT
GEARS
HYDRAULIC CONTROL DEVICES
MACHINE PARTS
MECHANICAL TRANSMISSIONS
OPERATION
PISTONS
SHAFTS
SOLENOIDS
VEHICLES