PROBLEM TO BE SOLVED: To provide a worm gear speed reducer capable of reducing torque fluctuation while allowing an assembly error or machining error, and a steering device including the worm gear speed reducer.SOLUTION: In a worm gear speed reducer 19, the relation between an outer diameter D1 of a worm 20 and an outer diameter D2 of a hob for cutting a worm wheel 21 and forming a tooth groove 42 satisfies the following formula (1): 3≥D2/D1≥1.7; and the relation between a pressure angle α of the worm wheel 21 and a pressure angle β of the worm 20 on an engagement pitch circle P of the worm 20 and worm wheel 21 satisfies the following formula (2): 0.1 degrees≤α-β≤0.5 degrees.SELECTED DRAWING: Figure 4

    【課題】組み付け誤差や加工誤差を許容しつつ、トルク変動を低減できるウォーム減速機およびこのウォーム減速機を含むステアリング装置を提供すること。【解決手段】ウォーム減速機19では、ウォーム20の外径D1と、ウォームホイール21を切削して歯溝42を形成するためのホブの外径D2との関係が以下の式(1)を満足する。ウォーム20およびウォームホイール21の噛み合いピッチ円Pにおけるウォームホイール21の圧力角αとウォーム20の圧力角βとの関係が以下の式(2)を満足する。3≧D2/D1≧1.7 …式(1)0.1度≦α−β≦0.5度 …式(2)【選択図】図4


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    Title :

    WORM GEAR SPEED REDUCER AND STEERING DEVICE


    Additional title:

    ウォーム減速機およびステアリング装置


    Contributors:

    Publication date :

    2016-12-22


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F16H Getriebe , GEARING / B23F Herstellen von Zahnrädern oder Zahnstangen , MAKING GEARS OR TOOTHED RACKS / B62D MOTOR VEHICLES , Motorfahrzeuge



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