To provide a worm speed reducer which can inhibit occurrence of abnormal noise between a buffer member and an outer peripheral surface of a bearing.SOLUTION: A worm speed reducer 40 includes: a housing 42; a worm shaft 44 which has a first end part 56 and a second end part 58; a worm wheel 50 which engages with the worm shaft 44; a second bearing 48 which rotatably supports the second end part 58 of the worm shaft 44; a biasing member 52 which biases the second end part 58 of the worm shaft 44 to the worm wheel 50 side; and a buffer member 54 which is disposed between the housing 42 and an outer peripheral surface of the second bearing 48. An inner peripheral surface 66a of the buffer member 54 is formed with a rough surface part 72 for releasing air between the inner peripheral surface 66a and the outer peripheral surface 48a of the second bearing 48. Surface roughness Ra of the rough surface part 72 ranges from 2.5 μm or more to 50 μm or less.SELECTED DRAWING: Figure 4

    【課題】緩衝部材と軸受の外周面との間で異音が発生するのを抑制することができるウォーム減速機を提供する。【解決手段】ウォーム減速機40は、ハウジング42と、第1の端部56及び第2の端部58とを有するウォームシャフト44と、ウォームシャフト44と噛み合うウォームホイール50と、ウォームシャフト44の第2の端部58を回転可能に支持する第2の軸受48と、ウォームシャフト44の第2の端部58をウォームホイール50側に付勢する付勢部材52と、ハウジング42と第2の軸受48の外周面との間に介在された、緩衝部材54とを備える。緩衝部材54の内周面66aには、当該内周面66aと第2の軸受48の外周面48aとの間の空気を外部に逃がすための粗面部72が形成され、粗面部72の表面粗さRaは、2.5μm以上50μm以下である。【選択図】図4


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    Title :

    WORM SPEED REDUCER AND ELECTRIC POWER STEERING DEVICE


    Additional title:

    ウォーム減速機及び電動パワーステアリング装置


    Contributors:

    Publication date :

    2020-06-25


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F16H Getriebe , GEARING / B62D MOTOR VEHICLES , Motorfahrzeuge / F16C SHAFTS , Wellen



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