Patent · US Active

Hydraulic supply system for a hydraulically-actuated automatic transmission

US8308606B2 · kind B2 · utility

1Cited by

2References

7Claims

0Family size

Assignee

Schaeffler Technologies AG & Co. KG · DE

Inventors

Eric Muller · Contz-les-Bains, FR
Marco Grethel · Frebershausen, DE
Hanjo Nissen · Bogen, DE
Franz Benz · Achern, DE

Key dates

Filing date	Dec 18, 2008
Grant date	Nov 13, 2012
Priority date	—
Expiry date	Apr 16, 2031

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/85986
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A hydraulic supply system for a hydraulically-operated automatic transmission includes a primary pump that is driven by an internal combustion engine of a vehicle. An electrically-driven auxiliary pump is provided to supply the system with hydraulic pressure when the primary pump is off or to supplement the primary pump when the primary pump does not deliver sufficient pressure. A discharge line from the auxiliary pump is connected to a control line of the hydraulic supply system and to the hydraulic system supply line under system pressure. Check valves are provided in the respective lines from the auxiliary pump. An additional check valve is provided in a line that extends from the control line to a torque sensing chamber of the automatic transmission.

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