Patent · US Active

Method for shifting actuation of an automated group transmission

US7976431B2 · kind B2 · utility

9Cited by

3References

6Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Josef Bader · Friedrichshafen, DE
Andreas Graf · Gottmadingen, DE
Martin Miller · Markdorf, DE
Mario Steinborn · Friedrichshafen, DE
Thomas Hafen · Salem, DE

Key dates

Filing date	Sep 9, 2008
Grant date	Jul 12, 2011
Priority date	—
Expiry date	Mar 19, 2030

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T74/1926
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A method for shifting an automated transmission situated in a drive train of a motor vehicle between an engine and a drive axle and having at least one multi-speed main transmission and a two-speed range change group rear-mounted thereon. The main transmission has at least one counter shaft with a transmission brake. A clutch engages the prime mover and the main transmission and the range change group is shifted via unsynchronized dog clutches which are combined in pairs in a common shift set and have two shift positions and one neutral position such that, during a range change gear shift both in the main transmission and the range change group a change between two ratio stages occurs. A range change up-shift includes synchronizing the input shaft and the target gear utilizing the transmission brake and passively synchronizing the dog shifted transmission parts by the edge beveling of the concerned dog clutches.

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