Hydraulically-assisted automatic skip shifting method of a multi-path toothed-wheel gear change box

US5172602A · kind A · utility

Assignee

• Mercedes-Benz Group AG · DE

Inventors

• Gunter Jurgens · Waiblingen, DE
• Gerhard Wagner · Brookline, US
• Frank Tietze · Stuttgart, DE

Key dates

• Filing date: Oct 5, 1991
• Grant date: Dec 22, 1992
• Expiry date: Oct 5, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/19251
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method for the automatic shifting of a multi-path toothed-wheel gear change box between two gears which are formed in a first gearbox subunit temporarily engages a middle gear formed in a second, parallel gearbox subunit. It is simultaneously ensured, by control of the working pressures for actuating the power-shift clutches connecting the gearbox subunits to the input shaft, that the speed characteristic of the input shaft shifting is essentially steady without remaining at the middle gear speed value.