Patent · US Active

Hydraulic or pneumatic control of an automated shift transmission

US8078370B2 · kind B2 · utility

4Cited by

5References

10Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Rainer Petzold · Friedrichshafen, DE
Mario Steinborn · Friedrichshafen, DE
Markus Deeg · Eberdingen, DE
Friedbert Roether · Cleebronn, DE

Key dates

Filing date	Aug 20, 2007
Grant date	Dec 13, 2011
Priority date	—
Expiry date	Oct 8, 2028

Classification

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

Abstract

A hydraulic or pneumatic control device for an automated shift transmission including actuating devices with actuating cylinders (15, 16) having pressure spaces (19a, 19b; 20a, 20b). The pressure spaces (19a, 19b; 20a, 20b) of the actuating cylinders (15, 16) can be connected by a respective control valve (22a, 22b; 32a, 32b) to a pressure line (26), which can be selectively connected to or cut off from a main pressure line (8) by a main shut-off valve (45a). At least one additional main shut-off valve (45b) is arranged in parallel with the first main shut-off valve (45a) between the main pressure line (8) and the pressure line (26) to improve the control characteristics and increase the operational reliability.

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