Patent · US Expired

Power shift transmission for motor vehicles

US6244402A · kind A · utility

9Cited by

6References

10Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Hans-Jorg Domian · Markdorf, DE
Ralf Dreibholz · Meckenbeuren, DE
Walter Kuhn · Friedrichshafen, DE

Key dates

Filing date	Dec 10, 1998
Grant date	Jun 12, 2001
Priority date	—
Expiry date	Dec 10, 2018

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB60W2710/18
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

A power shift transmission (3) for motor vehicles in which instead of a hydrodynamic torque converter a controlled or regulated multiple disc clutch serves to assist starting. The loading of clutch is minimized by a fitted catch which prevents the motor vehicle from rolling in the opposite direction to the direction of travel intended by the gear selection. Catch can take the form of a mechanical catch, as sprag unit, or the form of an electronically adjusted catch which acts on one and/or more transmission brakes and/or clutches and/or into the service brake of the vehicle.

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