Power-branched transmission and method for the operation of such a transmission

US7722493B2 · kind B2 · utility

Assignee

• MALI Holding AG · CH

Inventors

• Markus Liebherr · Ennetbaden, CH
• Josef Häglsperger · Gangkofen, DE
• Peter Dziuba · Helmstedt, DE
• Josef Bauer · Munich, DE
• Manfred Kirchhoff · Müncheberg, DE

Key dates

• Filing date: Oct 20, 2005
• Grant date: May 25, 2010
• Expiry date: Feb 13, 2027

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2039/005
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A power-branched transmission, particularly for agricultural vehicles such as tractors or similar, includes a stepped planetary gear which is disposed between an input shaft and an output shaft and is used for dividing the power supplied at the input shaft onto a mechanical power branch and a hydraulic power branch. The hydraulic power branch is formed by two hydraulically interconnected, identical hydrostatic axial piston engines which can be selectively operated as a pump or an engine, can be swiveled within a predefined pivoting angle, and can be connected to the input shaft or the stepped planetary gear in a different manner via two respective clutches so as to cover different operating ranges or running steps. In order to obtain better efficiency in such a power-branched transmission, the two hydrostatic axial piston engines are configured as wide-angle hydrostats that are provided with a minimum pivoting angle range of 45°.