Automatic transmission

Patent · Tue Oct 11 00:00:00 EDT 1988

OSTI ID:6525772

Miki, N

This patent describes an automatic transmission including a fluid torque converter, a first gear unit having three forward-speed gears and a single reverse gear, a second gear unit having a low-speed gear and a high-speed gear, and a hydraulic control system, the hydraulic control system comprising: a source of pressurized fluid; a first shift valve for controlling the shifting between the first-speed gear and the second-speed gear of the first gear unit; a second shift valve for controlling the shifting between the second-speed gear and the third-speed gear of the first gear unit; a third shift valve equipped with a spool having two positions for controlling the shifting between the low-speed gear and the high-speed gear of the second gear unit; a manual selector valve having a plurality of shift positions for distributing the pressurized fluid supply from the source of pressurized fluid to the first, second and third shift valves respectively; first, second and third solenoid valves corresponding to the first, second and third shift valves, respectively for independently controlling the operation of the respective shift valves, thereby establishing a six forward-speed automatic transmission by combining the low-speed gear and the high-speed gear of the second gear unit with each of the first-speed gear, the second speed gear and the third-speed gear of the first gear unit; and means to fixedly position the spool of the third shift valve at one of the two positions by supplying the pressurized fluid to the third shift valve when the manual selector valve is shifted to a particular shift position, thereby locking the second gear unit in one of low-speed gear and the high-speed gear, whereby the six forward-speed automatic transmission is converted to a three forward-speed automatic transmission when the manual selector valve is shifted to the particular shift position.

• Assignee: Aisin Warner Kabushiki Kaisha, Aichi
• Patent Number(s): US 4776240
• OSTI ID: 6525772
• Resource Relation: Patent File Date: Filed date 4 Feb 1982
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
CONTROL SYSTEMS
HYDRAULICS
MECHANICAL TRANSMISSIONS
AUTOMATION
COMPRESSION
DESIGN
GEARS
HYDRAULIC EQUIPMENT
OPERATION
SOLENOIDS
VALVES
VEHICLES
CONTROL EQUIPMENT
ELECTRIC COILS
ELECTRICAL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
FLUID MECHANICS
MACHINE PARTS
MECHANICS
330602* - Vehicle Design Factors- Engine-Transmission Matching