Invention Grant
- Patent Title: 8-speed transmissions
- Patent Title (中): 8速变速箱
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Application No.: US11832355Application Date: 2007-08-01
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Publication No.: US07946950B2Publication Date: 2011-05-24
- Inventor: Clinton E. Carey , Andrew W. Phillips , Scott H. Wittkopp , James M. Hart , Madhusudan Raghavan
- Applicant: Clinton E. Carey , Andrew W. Phillips , Scott H. Wittkopp , James M. Hart , Madhusudan Raghavan
- Applicant Address: US MI Detroit
- Assignee: GM Global Technology Operations LLC
- Current Assignee: GM Global Technology Operations LLC
- Current Assignee Address: US MI Detroit
- Agency: Quinn Law Group, PLLC
- Main IPC: F16H3/44
- IPC: F16H3/44

Abstract:
The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes three planetary gear sets, six torque-transmitting devices, two fixed interconnections and a grounded member. The powertrain includes an engine and torque converter that is continuously connected to one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting devices provide interconnections between various gear members, and the transmission housing, and are operated in combinations of two to establish eight forward speed ratios and one reverse speed ratio.
Public/Granted literature
- US20090036259A1 8-Speed Transmissions Public/Granted day:2009-02-05
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