Patent · US Active

Double-clutch transmission with a device for controlling a plurality of hydraulic shift cylinders

US8272288B2 · kind B2 · utility

1Cited by

1References

8Claims

0Family size

Assignee

Schaeffler Technologies AG & Co. KG · DE

Inventors

Felix Dreher · Waldkirch, DE
Dietmar Lang · Regenstauf, DE
Martin Staudinger · Ettlingen, DE

Key dates

Filing date	Jul 23, 2008
Grant date	Sep 25, 2012
Priority date	—
Expiry date	Jul 26, 2031

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T74/20024
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A double-clutch transmission having at least three and preferably four, hydraulic shift cylinders, and a control device to actuate the hydraulic shift cylinders. To improve the speed of operation when selecting a gear, the shift cylinders needed for gear shifting are actuated with the aid of at least three electromagnetically shiftable directional valves.

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