MULTI-SPEED PLANETARY TRANSMISSION

    公开(公告)号:US20180087609A1

    公开(公告)日:2018-03-29

    申请号:US15278586

    申请日:2016-09-28

    Abstract: A multi-speed transmission including a plurality of planetary gearsets and a plurality of selective couplers to achieve at least nine forward speed ratios is disclosed. The plurality of planetary gearsets may include a first planetary gearset, a second planetary gearset, a third planetary gearset, and a fourth planetary gearset. The plurality of selective couplers may include a number of clutches and a number of brakes. The multi-speed transmission may have four planetary gearsets and six selective couplers. The six selective couplers may include three clutches and three brakes.

    Planetary gear train of automatic transmission for vehicle

    公开(公告)号:US09856951B2

    公开(公告)日:2018-01-02

    申请号:US15191833

    申请日:2016-06-24

    Abstract: A planetary gear train of an automatic transmission for a vehicle may include an input shaft configured for receiving an engine torque, an output shaft configured for outputting a shifted torque of the engine, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, six control elements for selectively interconnecting rotation elements of the planetary gear sets and a transmission housing, a first connecting member selectively connected to the transmission housing, a second connecting member selectively connected to the transmission housing, a third connecting member directly connected to the input shaft, a fourth connecting member selectively connected to the transmission housing, a fifth connecting member selectively connected to the input shaft, and selectively connected to the transmission housing, a sixth connecting member directly connected to the output shaft, and a seventh connecting member selectively connected to the input shaft.

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