Patent · US Active

Transmission device with a hydraulic system comprising a transmission main pump apparatus

US8808129B2 · kind B2 · utility

1Cited by

4References

20Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Matthias List · Dresden, DE
Thilo Schmidt · Meckenbeuren, DE
Thomas Lindner · Polling, DE
Peter Tiesler · Meckenbeuren, DE

Key dates

Filing date	Oct 27, 2009
Grant date	Aug 19, 2014
Priority date	—
Expiry date	Sep 19, 2032

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H61/0031
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A transmission device (1) with a hydraulic system (4) comprising a main transmission pump device for supplying various transmission components with hydraulic fluid. The main transmission pump device is driven by torque applied to the transmission input shaft (2). A force flow between the transmission input shaft (2) and transmission output shaft (3) is produced by various hydraulically actuated transmission components. When the hydraulic system (4) is not supplied by the main transmission pump, the force flow is interrupted. The hydraulic system (4) has an auxiliary pump device (5) by virtue of which the hydraulic system (4) too can be supplied with hydraulic fluid. The auxiliary pump device (5) is driven by torque applied to the transmission output shaft (3) at least when the force flow is interrupted.

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