PROBLEM TO BE SOLVED: To prevent deterioration of characteristics of grease.SOLUTION: A feed screw mechanism 48 includes a male screw member 112 having a male screw portion 112a and a female screw member 114 having a female screw portion 117a. The male screw member 112 has a grease holding groove 200 formed at the center along the axial direction, and a taper portion 204 substantially formed into the taper shape, positioned between an incomplete screw portion 129a closest to the grease holding groove 200 and the grease holding groove 200 at both sides through the grease holding groove 200, and being in non-contact with the female screw portion 117a formed on the female screw member 114, and the depth (D1) of a bottom surface 202 of the grease holding groove 200 is deeper than the depth (D2) of a trough portion 131 (D1>D2), and the grease holding groove 200 is filled with grease G.

    【課題】グリスの性状の劣化を回避すること。【解決手段】送りねじ機構48は、雄ねじ部112aを有する雄ねじ部材112と、雌ねじ部117aを有する雌ねじ部材114とを備え、雄ねじ部材112は、軸方向に沿った中央に形成されるグリス保持溝200と、グリス保持溝200を挟んだ両側で該グリス保持溝200に最も近接する不完全ねじ部129aとグリス保持溝200との間に位置し、雌ねじ部材114に形成される雌ねじ部117aと非接触で略テーパ状に形成されるテーパ部204とを有し、グリス保持溝200の底面202の深さ(D1)は、谷部131の深さ(D2)よりも深く形成され(D1>D2)、グリス保持溝200には、グリスGが充填される。【選択図】図4


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    Title :

    TELESCOPIC ACTUATOR


    Additional title:

    伸縮アクチュエータ


    Contributors:

    Publication date :

    2015-11-16


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F16H Getriebe , GEARING / B60G VEHICLE SUSPENSION ARRANGEMENTS , Radaufhängungen und Federungen für Fahrzeuge / B62D MOTOR VEHICLES , Motorfahrzeuge



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