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:
May. 02, 1978
Filed:
Aug. 21, 1975
Applicant:
Inventor:
Howard E Chana, Troy, MI (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16H / ;
U.S. Cl.
CPC ...
74759 ; 74753 ;
Abstract
A four-speed planetary transmission providing two underdrive ratios, a direct drive ratio, an overdrive ratio and a reverse ratio is disclosed. Three selectively operable friction clutches and two friction brakes are provided to connect the transmission input to the planetary gearing arrangement and to establish the above speed ratios. One of the clutches has serially disposed therewith a one-way clutch which is operable on a 3-4 upshift or, a 4-3 downshift or, a 4-2 downshift to provide a controlled drive path so that simultaneous overlapping of other friction drive establishing devices in the transmission is avoided during these ratio changes.