Stepless composite hydrostatic-mechanical transmission

US4304151A · kind A · utility

Assignee

• Zahnradfabrik Friedrichshafen AG · DE

Inventors

• Michael Meyerle · Meckenbeuren, DE
• Anton Ott · Tettnang, DE
• Friedrich Ehrlinger

Key dates

• Filing date: Dec 20, 1978
• Grant date: Dec 8, 1981
• Expiry date: Dec 20, 1998

Classification

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

Abstract

A composite transmission with power branching between a hydrostatic transmission and a mechanical summing transmission in which the hydrostatic transmission has a variable displacement unit. The input shaft is connected to the variable displacement unit and to a ring gear on the four-shaft summing transmission of which the ring gear and sun gear are selectively connectible by respective clutches to the constant displacement hydraulic unit. The planet carrier of the summing transmission is connected to the output shaft. The output shaft can also be directly coupled to the input shaft by a clutch and a further planetary can be provided between the fourth shaft of the summing transmission and the output shaft.