Patent · US Active

Transmission device and method for operating a transmission device

US9404574B2 · kind B2 · utility

0Cited by

8References

8Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Peter Ziemer · Tettnang, DE
Thilo Schmidt · Meckenbeuren, DE
Georg Gierer · Kreßbronn, DE
Gert Bauknecht · Friedrichshafen, DE
Thomas Lindner · Polling, DE
Peter Schiele · Kreßbronn, DE

Key dates

Filing date	Oct 6, 2010
Grant date	Aug 2, 2016
Priority date	—
Expiry date	Mar 20, 2033

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T74/19251
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A transmission device has at least one electro-hydraulic transmission control unit and a method of operating the transmission device having a plurality of gear wheel that can be engaged and disengaged from a force flow by fluidically actuated shifting elements. A piston space of a first shifting element, delimited by a second functional surface of the actuating piston of the first shifting element, is made separate from a piston space of a second shifting element, delimited by the first functional surface of the actuating piston, and an area of the second shifting element, that carries an actuating pressure, or an area of the first shifting element, that carries an actuating pressure, is, or can be, connected to the piston space delimited by the second functional surface of the actuating piston of the first shifting element.

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