PROBLEM TO BE SOLVED: To reduce surface pressure of a contact surface between a male screw and a female screw, and thereby reducing frictional force.SOLUTION: A feed screw mechanism 48 is provided with: a curve part 202 on an outer diameter side tooth surface of an effective diameter φX of a male screw part 112a; and a plane part 200 on an inner diameter side tooth surface of the effective diameter φX of the male screw part 112a. The tooth surface of a male screw is configured to be successive to the plane part 200 and the curve part 202. When a relative angel of the male screw part 112a and a female screw part 114a is zero so as to face each other, the plane surface of the plane part 200 contacts with the tooth surface of the female screw, and when a relative angle θ is formed by the male screw part 112a and the female screw part 114a, the curve surface of the curve part 202 contacts with the tooth surface of the female screw.SELECTED DRAWING: Figure 7

    【課題】雄ねじと雌ねじとの接触面の面圧を低下させ、摩擦力を低減すること。【解決手段】送りねじ機構48は、雄ねじ部112aの有効径φXの外径側歯面に曲面部202を設けると共に、雄ねじ部112aの有効径φXの内径側歯面に平面部200を設け、雄ねじの歯面が平面部200と曲面部202とが連続して構成される。雄ねじ部112aと雌ねじ部114aの相対角がゼロで正対するときには、平面部200の平面が雌ねじの歯面と接触すると共に、雄ねじ部112aと雌ねじ部114aとによって相対角θが形成されるときには、曲面部202の曲面が雌ねじの歯面と接触する。【選択図】図7


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    Title :

    TELESCOPIC ACTUATOR


    Additional title:

    伸縮アクチュエータ


    Contributors:

    Publication date :

    2016-07-11


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

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



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