Lock-synchronisied gearbox shift system

US5782331A · kind A · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

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

Key dates

• Filing date: Jan 22, 1996
• Grant date: Jul 21, 1998
• Expiry date: Jan 22, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/19284
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The invention concerns gearshift transmissions with a lock synchronization arrangement in which one synchronizer member, connected with a transmission shaft and at least one gear wheel rotating at a different speed, can be coupled together during synchronous speed by means of an annular sliding sleeve axially movable by a gearshift force. Coupling teeth of the sliding sleeve mesh with corresponding coupling teeth of each rotating gear wheel or of a clutch member connected with each rotating wheel. Between the sliding sleeve and each rotating gear wheel is situated one synchronizer ring, parts of said synchronizer ring forming, with parts connected with the gear wheel or provided thereon, a positively engaged coupling. In the absence of synchronism, the axial movement of the sliding sleeve is locked by blocking surfaces of locking teeth. The coupling teeth are stub-ended coupling teeth which are dampened by elastic elements. The axial shifting movement is terminated when the stub-ended coupling teeth butt upon each other. The gearshift stroke is shortened. The so-called "2nd point" in the gearshift cycle is no longer perceivable for the driver. Different embodiments are proposed.