Hydrodynamic transmission for vehicles

US4099426A · kind A · utility

Assignee

• Voith Getriebe KG · DE

Inventors

• Rolf Keller · Rutesheim, DE
• Erich Polzer · Heidenheim, DE

Key dates

• Filing date: Aug 19, 1976
• Grant date: Jul 11, 1978
• Expiry date: Aug 19, 1996

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/19153
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A transmission for locomotives, earthmoving vehicles or analogous conveyances has two closely adjacent parallel adjustable starting torque converters, one in the forward and the other in the reverse drive train, a common first gear train which connects the primary shafts of the starting converters with each other and with the input shaft, a second gear train which connects the secondary shafts of the starting converters with each other and with the output shaft, a cruising converter which is coaxial with the starting converter of the forward drive train and has a discrete secondary shaft coaxial with the secondary shaft of the respective starting converter and connected with the output shaft by a third gear train, a hydraulic brake whose rotor is driven by the secondary shaft of the starting converter of the reverse drive train and is effective only when the output shaft rotates in the forward direction, a first control unit which engages the brake and causes evacuation of working fluid from the working circuit of the cruising converter when the RPM of the output shaft is excessive, and a second control unit which reduces the transmission of power by the starting converter of the f…