Patent · US Expired

Transmission assembly with positive-displacement pump with suction throttle driven by a hydrodynamic converter

US5645406A · kind A · utility

4Cited by

20References

4Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Gerald Rowe · Gettorf, DE
Walter Kuhn · Friedrichshafen, DE
Christof Zippel · Salem, DE
Michael Reichenmiller · Schwäbisch Gmünd, DE

Key dates

Filing date	May 27, 1994
Grant date	Jul 8, 1997
Priority date	—
Expiry date	May 27, 2014

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T74/19149
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A gear for motor vehicles provided with a positive-displacement pump for supplying a lubricating device and the control and activating devices of the gear. The positive-displacement pump is driven by the rotation of a drive motor and is provided with a suction throttle which adjusts the flow of lubricating oil such that a relatively constant flow is maintained over a varying range of rotational speeds of the drive motor. The invention provides the advantages that gear efficiency can be improved since high rotational speeds of the drive motor do not cause a excessive flow of lubricating oil.

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