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:
Apr. 24, 1979
Filed:
Sep. 22, 1977
Josef Helmer, Aich, DE;
Hermann Gaus, Stuttgart, DE;
Abstract
An automatic change-speed transmission for vehicles with a drive connection between a transmission output shaft adapted to be coupled with vehicle wheels and a secondary servo-force generator for the emergency supply of aggregates of the transmission control and shifting system operating with a servo-pressure, which drive connection is adapted to be disconnected by a disengaging mechanism, and with a permanent drive connection between a transmission input shaft adapted to be driven by a driving engine and a primary servo-force generator for the normal supply of the aggregates; a servo-motor for the disengaging mechanism which is adapted to be displaced into a disengaging position disconnecting the secondary servo-force generator from the transmission output shaft is brought into its working position by a control device operating in dependence on the servo-force of the primary servo-force generator when the actual value of the servo-force lies below a necessary operating value.