Patent · US Expired

Gear actuator for engaging and/or disengaging gears of a transmission

US6723021B2 · kind B2 · utility

3Cited by

3References

3Claims

0Family size

Assignee

Hydraulik-Ring GmbH · DE

Inventors

Thomas Claus · Lörrach, DE
Roland Meyer · Jeffery Road, DE
Andreas Wild · Weimar, DE
Thomas Schmidt · Hannover, DE
Wolfgang Weigert · Tegernheim, DE
Stephan Pindl · Ergoldsbach, DE

Key dates

Filing date	Mar 7, 2002
Grant date	Apr 20, 2004
Priority date	—
Expiry date	Mar 7, 2022

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T74/20024
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A gear actuator for engaging and disengaging gears in an automatic manual transmission has a single working piston or two working pistons provided with a first working piston surface and a second working piston surface. An auxiliary piston is provided also. A pressure control valve controls a pressure supplied to the second working piston surface. A shut-off valve is provided. The first working piston surface and the pressure valve are supplied with a system pressure of a hydraulic system. The first working piston surface and the pressure control valve can be decoupled from the system pressure of the hydraulic system by the shut-off valve.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.