Patent · US Active

Hydraulic system for actuating at least one shifting element of a transmission

US8991276B2 · kind B2 · utility

2Cited by

8References

19Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Markus Herrmann · Scheidegg, DE
Thilo Schmidt · Meckenbeuren, DE

Key dates

Filing date	Jul 2, 2012
Grant date	Mar 31, 2015
Priority date	—
Expiry date	Jun 13, 2033

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/87096
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A hydraulic system (1) for actuating at least one shifting element (2) of a transmission. The hydraulic system comprises a regulating valve device (3) that can be preset and has a regulating valve slide (8), and a shifting valve device (4) which can also be preset and has a shifting valve slide (6). The shifting valve device (4) interacts with the regulating valve device (3). The regulating valve slide (8) and the shifting valve slide (6) are coaxially aligned with one another and move in opposite longitudinal directions within a common boring (24) of a housing (25). Each of the slides has a control surface (5, 14) which faces toward one another and can be pressurized with a pressure signal (p_VS) via a common pressure chamber (26).

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