Gm Global Technolgoy Operations, Inc.

David Allen Blenc

James Kevin Mainquist

Robert Charles Downs

Goro Tamai

Kyle Kenneth Kinsey

Kenneth J Micklash, Ii

Joel A Taylor

Tracey Lynn Myers

An electro-hydraulic control system for an automatic transmission comprises a manual selector valve for operator direction of line pressure fluid to a drive passage when drive is selected or to a reverse passage when reverse is selected. A drive/reverse passage connects the drive passage and the reverse passage. A first check ball is disposed between the drive passage and the drive/reverse passage and a second check ball is disposed between the reverse passage and the drive/reverse passage wherein the check balls operate to pressurize the drive/reverse passage when either drive or reverse is selected. The system further includes six fluid operated selectively engageable friction devices, three friction device actuators each associated with one of the six friction devices, in parallel relation and electronically actuated to direct fluid from the drive passage to the respective friction device, and a two-friction device actuator operative to direct fluid from the drive/reverse passage to one of two friction devices. Three pressure-operated feed protection valves are disposed intermediate of two of the actuators and their two friction devices, which operate to prevent flow to the two downstream friction devices.

Hydraulic control for a 5-speed automatic transmission

A first clutch circuit for an automatic transmission in a hybrid drive vehicle comprises an apply line extending from a manual valve to a clutch, with a check ball disposed in the apply line operable to move out of the apply line upon upstream fluid pressure, and an exhaust line extending from the apply line, downstream of the check ball, to an exhaust valve. A driver-triggered valve actuating means operates to close the exhaust valve when the driver selects drive with a driver shift lever and to open the exhaust valve when the driver shifts out of drive thereby releasing the clutch.

Clutch valving circuit for automatic transmission

A hydraulic control has a valve body assembly in which a plurality of control valves are contained. The valve body has separate structures which are secured together by fasteners. Separator plates are positioned between the structure levels to establish flow passages and sealing elements between fluid passages in the separate structures. The separator plate has two conical valve seats formed therein which cooperate with two pintle valves to control the flow of hydraulic fluid to and from a ratio controller within a power transmissions.

Valve assembly in a hydraulic control for a ratio controller in a power

Growing community of inventors

Shelby Township, Macomb County, MI, United States of America

David Allen Blenc