LINEAR ACTUATOR AND CLUTCH ACTUATOR

PROBLEM TO BE SOLVED: To obtain a linear actuator having a new structure which suffers fewer inconveniences, for example, improvement of a supporting form of a bearing.SOLUTION: A linear actuator includes: a fixing member; a first rotary member provided so as to rotate about a center axis; a second rotary member provided so as to rotate about the center axis; a one-way clutch which permits the relative rotation of the first rotary member in one direction about the center axis to the second rotary member, and prohibits the relative rotation of the first rotary member in the other direction about the center axis to the second rotary member; a thrust bearing which is interposed between the first rotary member and the second rotary member and permits the relative rotation about the center axis of the first rotary member and the second rotary member, while separating from the fixed member; a friction resistance member sandwiched between the fixed member and the second rotary member in the axial direction of the center axis; and a rotation/direct-action conversion mechanism which converts the rotation of the first rotary member into the direct-action of a direct-acting member.SELECTED DRAWING: Figure 2 【課題】例えば、ベアリングの支持態様を改善することが可能となるなど、より不都合の少ない新規な構成のリニアアクチュエータを得る。【解決手段】本発明のリニアアクチュエータは、固定部材と、中心軸回りに回転可能に設けられた第一回転部材と、中心軸回りに回転可能に設けられた第二回転部材と、第一回転部材の第二回転部材に対する中心軸回りの一方向への相対的な回転を許容するとともに第一回転部材の第二回転部材に対する中心軸回りの他方向への相対的な回転を禁止するワンウエイクラッチと、固定部材から離間した状態で、第一回転部材と第二回転部材との間に介在し第一回転部材と第二回転部材との中心軸回りの相対回転を許容するスラストベアリングと、固定部材と第二回転部材との間に中心軸の軸方向に挟まれた摩擦抵抗部材と、第一回転部材の回転を直動部材の直動に変換する回転直動変換機構と、を備える。【選択図】図２