BRAKE DEVICE

To obtain, as one example, a brake device which can suppress an increase of a friction force between screws which are screwed with each other, and the lowering of the mechanical rigidity and durability of a screw.SOLUTION: A brake device according to the present embodiment comprises a rotating member and a linear motion member at which male screws and female screws are arranged, and one of the rotating member and the linear motion member has a first region and a second region in which a first screw is arranged, and which are aligned in a direction along a rotating shaft. The first region has a first end and a second end which are connected to the second region, a first groove is formed at the first region, a range in which the first screw in the second region is arranged is larger than a range in which the first screw in the first region is arranged in a peripheral direction, the second screw is engaged with the first screw in the second region, the linear motion member moves in a first direction, and the second screw thereby approaches the second end.SELECTED DRAWING: Figure 2 【課題】一例として、互いに噛み合うネジの間の摩擦力が増大すること及びネジの機械的強度や耐久性が低下することを抑制可能な制動装置を得る。【解決手段】実施形態に係る制動装置は、雄ネジ及び雌ネジが設けられた回転部材及び直動部材を備え、前記回転部材と前記直動部材とのうち一方の部材は、それぞれに第１のネジが設けられるとともに回転軸に沿う方向に並ぶ第１の領域及び第２の領域を有し、前記第１の領域は、前記第２の領域に接続された第１の端と、第２の端と、を有し、前記第１の領域に第１の溝が設けられ、前記周方向において、前記第２の領域における前記第１のネジが設けられた範囲は、前記第１の領域における前記第１のネジが設けられた範囲よりも大きく、第２のネジは、前記第２の領域における前記第１のネジと噛み合い、前記直動部材が前記第１の方向に移動することで、前記第２のネジが前記第２の端に近づく。【選択図】図２