Gear shift device

US4807489A · kind A · utility

Assignee

• Zahnradfabrik Friedrichshafen AG · DE

Inventors

• Friedrich Schreiner · Spaichingen, DE
• Otto Ebner · Friedrichshafen, DE
• Gerhard Buri · Markdorf, DE
• Bernhard Grupp · Weingarten, DE

Key dates

• Filing date: Mar 21, 1986
• Grant date: Feb 28, 1989
• Expiry date: Mar 21, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/20636
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A gear shift device e.g. for a six-speed automotive speed change transmission with a gear shift lever for selection and shifting of all gears and with shift rails for the shifting of gears in one shift path has an H-shaped shift pattern similar to a four-speed transmission and has means for fixing or returning of a central selection and shift shaft or rotating shaft and/or the gear-shift lever into predetermined shift paths, e.g. the gears 3/4, where for the shift path of the gears 5/6 a retention device is provided additionally, which upon completed or nearly completed shift into the next higher, that is sixth gear, retains the central selection and shift shaft or the rotating shaft and/or the gear-shift lever in this shift path and upon completed or nearly completed shift into the next lower, that is fifth gear, permits the return of the central selector and shift shaft or the rotating shaft and/or the gear-shift lever into a lower shift path, e.g. the shift path of the gears 3/4, when the gear shift shaft is placed again into the neutral position. Thereby misshifts, e.g. from the sixth to the third gear are prevented due to the effective return device.