The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 11, 2014
Filed:
Nov. 19, 2010
Thilo Schmidt, Meckenbeuren, DE;
Georg Gierer, Kressbronn, DE;
Thilo Schmidt, Meckenbeuren, DE;
Georg Gierer, Kressbronn, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
An actuating device for a shift element of a transmission which is acted upon by a hydraulic actuating pressure (p_B) and comprises a valve device. To vary the actuating pressure (p_B), the valve device is acted upon by a control pressure (p_EDS) in an area of active surfaces (A, A) of at least a first and a second valve slides. An active surface (A) of the first valve slide (A) is acted upon by a hydraulic pressure (p_B) which is equivalent to the actuating pressure (p_B), acts in opposition to the control pressure (p_EDS) and can be adjusted as a function of the control pressure (p_EDS) applied, such that a smaller variation of the actuating pressure (p_B) results from a change of the control pressure (p_EDS) within a first pressure range of the control pressure (p_EDS) than within a second pressure range of the control pressure (p_EDS).