Multiple stage gearbox shiftable under load

US4641549A · kind A · utility

Assignee

• J.M. Voith GmbH · DE

Inventor

• Helmut Muller · Bensberg, DE

Key dates

• Filing date: Apr 22, 1985
• Grant date: Feb 10, 1987
• Expiry date: Apr 22, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/19163
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A change spur gear of reducer unit design features two paths of force. The first path of force comprises a unit which provides gearing to high speed, a hydrodynamic torque converter and, following it, a multiple shift gear. The second path of force comprises as well a unit which provides gearing to high speed, on the high speed shaft of which there is a hydrodynamic servoclutch arranged. The secondary vane wheel connects through appropriate reducers with the transmission output. In shifting from one gear to another, the servoclutch is filled first, then the respective shift detent is disengaged under no load, the servoclutch is adjusted to the slip corresponding with the next gear thereby enabling a no-load shifting of the detent of the next gear. Upon emptying of the servoclutch, the engine moment is again assumed by the first path of force without any interruption of the traction force.