PROBLEM TO BE SOLVED: To provide a worm wheel capable of suppressing deterioration of accuracy in flatness with respect to an axial direction of an outer peripheral surface in a radial direction of a tooth part, to provide an electric power steering device and to provide a manufacturing method of a worm wheel.SOLUTION: A worm wheel 24 includes: a sleeve 50; a tooth formation part 65 provided on an outer peripheral surface 54c of a second annular part 54 in the sleeve 50; and a tooth part 60 having a first thick wall part 63 provided on a first side surface 54a closer to a gate of injection moulding of the second annular part 54 and a second thick wall part 64 provided on a second side surface 54b on the opposite side from the first side surface 54a of the second annular part 54. Then, in the outer peripheral surface 54c of the second annular part 54, a central part 54cc protrudes further to the radial direction compared to both end parts 54ca, 54cb, and in the first thick wall part 63 of the tooth part 60, the wall thickness in the axial direction is set to be smaller than the second thick wall part 64.SELECTED DRAWING: Figure 4

    【課題】歯部の径方向の外周面の軸方向に対する平坦性の精度の低下を抑えられるウォームホイール、電動パワーステアリング装置、及び、ウォームホイールの製造方法を提供する。【解決手段】ウォームホイール24は、スリーブ50と、スリーブ50において、第2環状部54の外周面54c上に設けられた歯形成部65、第2環状部54の射出成形のゲート寄りの第1側面54a上に設けられた第1肉厚部63、及び、第2環状部54の第1側面54aとは反対側の第2側面54b上に設けられた第2肉厚部64を有する歯部60とを備えている。そして、第2環状部54の外周面54cは、中央部54ccが両端部54ca,54cbと比較して径方向に突出しており、歯部60の第1肉厚部63は、第2肉厚部64と比較して軸方向の肉厚が小さく設定されるようにした。【選択図】図4


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    Title :

    WORM WHEEL, ELECTRIC POWER STEERING DEVICE AND MANUFACTURING METHOD OF WORM WHEEL


    Additional title:

    ウォームホイール、電動パワーステアリング装置、及び、ウォームホイールの製造方法


    Contributors:

    Publication date :

    2018-01-18


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F16H Getriebe , GEARING / B29C Formen oder Verbinden von Kunststoffen , SHAPING OR JOINING OF PLASTICS / B62D MOTOR VEHICLES , Motorfahrzeuge



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