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To reduce the design cost of planetary gear trains (PGTs) with torque converter, a systemic synthesis method of seven-speed PGTs is proposed based on six-speed PGTs for heavy-duty commercial vehicles. First, the six-speed PGTs with three degrees of freedom (DOFs) and three planetary gear sets (PGSs) are synthesized with the method of switched-input and variable fixed interconnection. Second, seventeen...
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