Mechanical gear selector

US4542662A · kind A · utility

Assignee

• Zahnradfabrik Friedrichafen · DE

Inventor

• Gerold Bieber · Tettnang, DE

Key dates

• Filing date: Nov 18, 1982
• Grant date: Sep 24, 1985
• Expiry date: Nov 18, 2002

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/20558
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

In a mechanical gear selector for a synchronized gear change, there is disposed an automatic force amplifier--primarily a hydrostatically operating automatic amplifier--that amplifies or amplifies the force introduced depending on the magnitude thereof, no separate energy such as a fluid pump being needed therefor, and the amplification also taking place only when needed, primarily for the synchronization of gears. Between a force input shaft and a casing disposed concentrically thereto, which casing also transmits the amplified force, there is situated in connection with an annular and a pressure space the force amplifier proper and a spring element for the defined amplification threshold. On the design depends from what input force amplification starts. From a defined amplified pressure, the amplifying action is terminated by a pressure-reducing valve so that the transmission of force is continued practically with this pressure that has been reached or a pressure therebelow.