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:
Mar. 03, 1981
Filed:
Jan. 05, 1978
Applicant:
Inventors:
Willi Kuhnle, Friedrichshafen, DE;
Heinz Wendler, Meckenbeuren, DE;
Assignee:
Zahnradfabrik Friedrichshafen AG, Friedrichshafen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16H / ; F16H / ;
U.S. Cl.
CPC ...
74861 ; 7475 / ; 74866 ;
Abstract
An electrohydraulic speed change system for a load-shiftable gear transmission of an automotive vehicle in which hydraulic devices such as clutches and brakes are operated by electromagnetic actuation of respective valves of the hydraulic system. The speed selection is effected by a series-connected array of switches and the circuit means provided for actuation of the electromagnetic valve includes time-delay networks operating an interrupter switch in series with this array.