Invention Grant
- Patent Title: Stepped automatic transmission
- Patent Title (中): 步进自动变速箱
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Application No.: US11659464Application Date: 2005-08-08
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Publication No.: US07670248B2Publication Date: 2010-03-02
- Inventor: Gert Bauknecht , Peter Ziemer , Armin Gierling
- Applicant: Gert Bauknecht , Peter Ziemer , Armin Gierling
- Applicant Address: DE Friedrichshafen
- Assignee: ZF Friedrichshafen AG
- Current Assignee: ZF Friedrichshafen AG
- Current Assignee Address: DE Friedrichshafen
- Agency: Davis & Bujold, P.L.L.C.
- Priority: DE102004038294 20040806
- International Application: PCT/EP2005/008589 WO 20050808
- International Announcement: WO2006/015840 WO 20060216
- Main IPC: F16H3/62
- IPC: F16H3/62

Abstract:
A multi-stage automatic transmission comprises a drive input shaft (AN), a drive output shaft (AB), a double planetary transfer gearset (VS), a main gearset (HS) made as a coupled planetary gearset with at least three non-coupled input elements and one output element, and six shift elements (A to F), which, when engaged in pairs, enable at least eight forward gears to be engaged. An input element of the transfer gearset (VS) is connected with the drive input shaft (AN). An output element of the transfer gearset (VS) rotates at a speed lower than the input speed of the drive input shaft (AN). An element of the transfer gearset (VS) is fixed on a transmission housing (GG). The first input element of the main gearset (HS) can be connected via a second shift element (B) to the output element of the transfer gearset (VS), can be fixed by a third shift element (C), and can be connected with the drive input shaft (AN) by a sixth shift element (F). The second input element of the main gearset (HS) can be connected via a first shift element (A) to the output element of the transfer gearset (VS). The third input element of the main gearset (HS) can be fixed by a fourth shift element (D) and can be connected by a fifth shift element (E) to the drive input shaft (AN). The output element of the main gearset (HS) is connected to the drive output shaft (AB). The third and sixth shift elements (C, F) are arranged on the side of the main gearset (HS) opposite to the transfer gearset (VS). Alternatively, the third shift element (C) can also be arranged radially over the main gearset (HS).
Public/Granted literature
- US20080045372A1 Stepped Automatic Transmission Public/Granted day:2008-02-21
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