Patent · US Expired

Shiftable transmission

US6949042B2 · kind B2 · utility

5Cited by

11References

7Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Helmut Eymuller · Friedrichshafen, DE
Siegfried Stutzle · Friedrichshafen, DE
Jurgen Legner · Friedrichshafen, DE

Key dates

Filing date	Apr 27, 2002
Grant date	Sep 27, 2005
Priority date	—
Expiry date	Jun 16, 2022

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H2063/3036
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A shiftable transmission in which at least two clutches (2, 7) actuated in closing direction by spring force and in opening direction by the exertion of pressure are arranged, wherein output of the transmission is stopped by unpressurized shifting of both actuation devices (9, 13) thereby closing both clutches (2, 7). When pressure is exerted upon the second actuation device (13), the actuation force of the first actuation device (9) is composed of a spring force of the first actuation device (9) and a hydraulic force from the pressurization of the second actuation device (13). The clutch belonging to the first actuation device can thus be impinged upon with different forces depending on whether or not the second actuation device is impinged upon with pressure.

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