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Abstract

A transmission mechanism having a cooling flow path, the transmission mechanism comprising a shaft assembly and an inner cylinder. A first annular rib portion is formed on an outer peripheral wall of one axial end of the inner cylinder to close a gap between the axial end of the inner cylinder and the shaft assembly, and a second annular rib portion is formed on an outer peripheral wall of the other axial end of the inner cylinder to close a gap between the other axial end of the inner cylinder and the shaft assembly, such that a cooling medium entering from an inlet of the shaft assembly can flow through a central hole, a communication hole, an intermediate space and a discharge hole to be discharged to the outside of the shaft assembly. An electric bridge drive system including the transmission mechanism.

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First Claim