Invention Grant
- Patent Title: Actuating device for a shift element of a transmission device which can be applied with an actuating pressure
- Patent Title (中): 用于可施加致动压力的变速器装置的变速元件的致动装置
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Application No.: US12950062Application Date: 2010-11-19
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Publication No.: US08667885B2Publication Date: 2014-03-11
- Inventor: Thilo Schmidt , Georg Gierer
- Applicant: Thilo Schmidt , Georg Gierer
- Applicant Address: DE Friedrichshafen
- Assignee: ZF Friedrichshafen AG
- Current Assignee: ZF Friedrichshafen AG
- Current Assignee Address: DE Friedrichshafen
- Agency: Davis & Bujold, PLLC
- Agent Michael J. Bujold
- Priority: DE102009054541 20091211
- Main IPC: F16H61/28
- IPC: F16H61/28

Abstract:
An actuating device for a shift element of a transmission which is acted upon by a hydraulic actuating pressure (p_B1) and comprises a valve device. To vary the actuating pressure (p_B1), the valve device is acted upon by a control pressure (p_EDS) in an area of active surfaces (A18, A19) of at least a first and a second valve slides. An active surface (A38) of the first valve slide (A8) is acted upon by a hydraulic pressure (p_B2) which is equivalent to the actuating pressure (p_B1), 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_B1) 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).
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