Motor vehicle gearbox

US5503039A · kind A · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Gerhard Bailly · Friedrichshafen, DE
• Unal Gazyakan · Friedrichshafen, DE

Key dates

• Filing date: Apr 20, 1994
• Grant date: Apr 2, 1996
• Expiry date: Apr 20, 2014

Classification

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

Abstract

In a motor vehicle transmission, in particular a multi-speed synchronized countershaft transmission, each two speeds are associated with one among several gearshift sets (28, 29). It is essential that the two speeds (1st and 3rd or 2nd and 4th) associated with each gearshift set are not successive speeds. The great advantage here is that the gearshifting thus obtained is a "shifting-shifting" system which makes it possible to carry out overlapping actuating operations and thus a reduction of the time interval between gearshifts. At certain speeds, several gearshift sets or synchronizing mechanisms can be simultaneously loaded whereby the load of the individual gearshift sets (28, 29) is substantially reduced. Great advantages such as shorter gearshifting times, longer service life of the synchronizing sets and smaller gearshift sets may thus be obtained.