Patent · US Active

Method for actuating a hydraulic storage device of a transmission unit

US7798271B2 · kind B2 · utility

3Cited by

5References

6Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Peter Schiele · Kreßbronn, DE
Armin Thiele · Tettnang, DE
Klaus Steinhauser · Kreßbronn, DE

Key dates

Filing date	Sep 6, 2007
Grant date	Sep 21, 2010
Priority date	—
Expiry date	Oct 21, 2028

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H2312/20
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A process for actuating a hydraulic storage device (5) of a transmission unit comprising a storage space (9) whose volume can be varied between a minimum and a maximum. The volume of the storage space can be changed by acting upon the storage space with pressurized hydraulic fluid from a pressure supply (19) of the transmission unit. To overcome a restoring tendency of the hydraulic storage device, the pressure is set to a threshold value. A holding device (12) holds the hydraulic storage device at least in the operating condition that corresponds to the maximum volume of the storage space against the restoring tendency. The storage space is acted upon by the pressure supply with a pressure corresponding to a threshold value (P_threshold) until the hydraulic storage device reaches the operating condition in which it can be held by the holding device.

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