To provide a stopper which enables improvement of durability by controlling a folding method of a bellows.SOLUTION: A cylindrical stopper made of a thermoplastic elastomer includes: a cylindrical expansion/contraction part which includes a first end and a second end in an axial direction and in which an inner peripheral surface and an outer peripheral surface are formed in bellows shapes where crests and troughs continue in the axial direction; and an annular contact surface part which extends from the second end to the outer side in an axial perpendicular direction of a center axis. The contact surface part includes: an inner surface which continues into the inner peripheral surface so as to form a peak at the inner side in the axial perpendicular direction of the second end and faces an axial end surface of a second member; an outer surface which continues into the outer peripheral surface so as to form a trough bottom at the outer side in the axial perpendicular direction of the second end; and an outer end part which is located at the outer side in the axial perpendicular direction relative to the plurality of peaks of the outer peripheral surface of the expansion/contraction part.SELECTED DRAWING: Figure 1
【課題】蛇腹の折り畳み方の制御により耐久性を向上できるストッパを提供すること。【解決手段】筒状の熱可塑性エラストマ製のストッパは、軸方向の第1端および第2端を含み、山と谷とが軸方向に連続する蛇腹状に内周面および外周面が形成された筒状の伸縮部と、第2端から中心軸の軸直角方向の外側へ延びた環状の接触面部と、を備える。接触面部は、第2端の軸直角方向の内側に山頂を形成するように内周面に連なり第2部材の軸方向端面に面する内面と、第2端の軸直角方向の外側に谷底を形成するように外周面に連なる外面と、伸縮部の外周面の複数の山頂よりも軸直角方向の外側に位置する外端部と、を含む。【選択図】図1
STOPPER
ストッパ
2022-02-03
Patent
Electronic Resource
Japanese