Patent · US Expired

Hydromechanical transmission with power branching

US4382392A · kind A · utility

23Cited by

14References

2Claims

0Family size

Assignee

Zahnradfabrik Friedrichshafen AG · DE

Inventors

Michael Meyerle · Meckenbeuren, DE
Gisbert Lechner · Böblingen, DE
Anton Ott · Tettnang, DE

Key dates

Filing date	Apr 17, 1978
Grant date	May 10, 1983
Priority date	—
Expiry date	Apr 17, 1998

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H2037/106
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

This invention is for a hydrostatic-mechanical transmission system of the power-branching type having a "neutral" operating mode. An assembly of a hydrostatic transmission including a variable displacement pump and a hydraulic motor is connected to the input shaft of a mechanical transmission. The mechanical transmission has a speed-range selector defining a first low-speed range for the gearing and a second high-speed range for the gearing. Two planetary gear sets in succession are coupled to the transmission such that the transmission ratios of the hydrostatic transmission and the mechanical transmission establish a neutral mode in each speed range a zero output contribution by the mechanical transmission.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.