PROBLEM TO BE SOLVED: To suppress deformation caused by difference in linear expansion coefficients between different materials.SOLUTION: A telescopic actuator includes a feed screw mechanism 48 composed of a male screw member 112 having a male screw portion 112a, and a female screw member 114 engaged with the male screw portion 112a, and converting the rotating motion of a motor 42 into reciprocating linear motion. The male screw member 112 and the female screw member 114 are respectively composed of different materials, and include an auxiliary member 200 of a linear expansion coefficient αin the axial direction, satisfying a relationship of α<α<αwhen a linear expansion coefficient in the axial direction of the male screw member 114 is α, a linear expansion coefficient in the axial direction of the female screw member 114 is α, and a magnitude relationship of the linear expansion coefficients is α<α. The an auxiliary member 200 is integrally coupled inside the male screw member 112 and within an axial range including the male screw portion 112a.
【課題】異種材料間の線膨張係数の違いによる変形を抑制すること。【解決手段】雄ねじ部112aを有する雄ねじ部材112と、雄ねじ部112aに螺合する雌ねじ部材114とからなり、モータ42の回転運動を往復直線運動に変換する送りねじ機構48を備え、雄ねじ部材112と雌ねじ部材114は、それぞれ異種材料からなり、雄ねじ部材112の軸方向の線膨張係数をαSとし、雌ねじ部材114の軸方向の線膨張係数をαNとし、線膨張係数の大小関係がαS<αNのとき、αS<αN<αCの関係を満たす軸方向の線膨張係数αCの補助部材200を備え、補助部材200を、雄ねじ部材112の内部で且つ雄ねじ部112aを有する軸方向の範囲で一体的に結合させて構成する。【選択図】図3
TELESCOPIC ACTUATOR
伸縮アクチュエータ
2015-11-16
Patent
Electronic Resource
Japanese