The present invention relates to a speed reducer for a vehicle. The speed reducer of an electric power steering system includes a worm and a worm wheel, wherein the worm wheel includes: a boss having an empty space into which a steering shaft is inserted; a gear part integrally formed with the outer circumferential surface of the boss and having crests and roots formed on the outer circumferential surface thereof so as to be engaged with the worm; and a heat conduction member provided on the side of the boss and the gear part to support the roots and the boss to conduct, to the boss, frictional heat generated from the gear part. Accordingly, the speed reducer releases frictional heat from the worm wheel to the boss to prevent wear and noise caused by expansion of the worm wheel.


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    Title :

    Speed reducer for vehicle


    Contributors:

    Publication date :

    2019-09-17


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    F16H Getriebe , GEARING / B62D MOTOR VEHICLES , Motorfahrzeuge



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