To provide a ball screw that can downsize a member pressing a pressed member.SOLUTION: A ball screw 10 is provided with a nut 30, a screw shaft 40, and a plurality of rolling bodies 51. The nut 30 is equipped with a cylindrical nut body 31 equipped with a first screw groove 311 on an inner peripheral surface, and a pressing portion 33 that blocks one end in an axial direction of the nut body 31. The screw shaft 40 is equipped with a screw shaft body 41 equipped with a second screw groove 411 on an outer peripheral surface and disposed on the inside of the nut body 31. The plurality of rolling bodies 51 is disposed in a rolling path 55 that is a spiral space between the first screw groove 311 and the second screw groove 411. The screw shaft body 41 is equipped with a circulation groove 415 leading the rolling bodies 51 from one end to the other end of the rolling path 55.SELECTED DRAWING: Figure 1
【課題】被押圧部材を押す部材を小型化できるボールねじを提供すること。【解決手段】ボールねじ10は、ナット30と、ねじ軸40と、複数の転動体51と、を備える。ナット30は、内周面に第1ねじ溝311を備える筒状のナット本体31、及びナット本体31の軸方向の一端を塞ぐ押圧部33を備える。ねじ軸40は、外周面に第2ねじ溝411を備え且つナット本体31の内側に配置されるねじ軸本体41を備える。複数の転動体51は、第1ねじ溝311及び第2ねじ溝411の間の螺旋状の空間である転動路55に配置される。ねじ軸本体41は、転動体51を転動路55の一端から他端へ導く循環溝415を備える。【選択図】図1
BALL SCREW
ボールねじ
2021-08-10
Patent
Electronic Resource
Japanese
Ball screw and electromechanical actuator with such ball screw
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