Load splitting hydromechanical transmission

US4291592A · kind A · utility

Assignee

• Zahnradfabrik Friedrichshafen AG · DE

Inventors

• Michael Meyerle · Meckenbeuren, DE
• Friedrich Ehrlinger

Key dates

• Filing date: Dec 6, 1978
• Grant date: Sep 29, 1981
• Expiry date: Dec 6, 1998

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2037/0886
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A hydromechanical drive has an input shaft connected permanently to the input of a variable-volume hydraulic pump and to the planet carrier of a summing transmission. The pump in turn drives a motor which in turn rotates the sun gear of this summing transmission, which has a first planet gear meshing with the sun gear and with a respective ring gear and a second planet gear meshing with the first planet gear and with a respective ring gear. A planetary-gear output transmission has its planet carrier connected to the ring gear of the second planet gear of the summing transmission and a planet carrier connected permanently to the output shaft of the drive and connectable through an openable clutch to the ring gear of the first planet gear of the summing transmission. In addition this output transmission has a first planet gear meshing with the respective sun gear and with a respective ring gear and a second planet gear meshing with the respective first planet gear and with its own ring gear. Brakes can arrest either of the ring gears of the output transmission. This output transmission can be replaced by a constant-mesh stepdown gear box. Thus the force applied to the input shaft of …