Automatic change-speed transmission with a secondary servo-generator for the emergency supply of aggregates of the transmission control and shifting system operating with a servo-force

US4150543A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Josef Helmer · Ingolstadt, DE
• Hermann Gaus · Stuttgart, DE

Key dates

• Filing date: Sep 22, 1977
• Grant date: Apr 24, 1979
• Expiry date: Sep 22, 1997

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H61/0025
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

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.