The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 13, 1977
Filed:
Feb. 19, 1975
Ted M McQuinn, Carmel, IN (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A transmission having a plurality of gear ratios which are selectively engaged on the supply of fluid to a servo motor fluid chamber and controls. The controls have a source of fluid under regulated pressure selectively connected by a relay valve respectively in a first and a second position to a first and a second servo motor to provide a first and a second ratio drive, an automatic shift valve controlled by speed and torque demand for shift movement between a first and a second position having spaced lands slidably sealed in a bore and a smaller intermediate restricting portion providing a restricted passage between the bore and restriction portion operative in the first position to restrictively connect the actuator chamber of the relay valve so the relay valve is in first position and in the second position to restrictively connect said source to the actuator chamber of the relay valve to shift the relay valve to second position.