公开(公告)号：US20160223059A1

公开(公告)日：2016-08-04

申请号：US15021340

申请日：2014-01-31

Applicant: NSK LTD.

Inventor： Motoshi SAKAI ,  Koji HASHIMOTO

IPC: F16H25/22

CPC classification number: F16H25/2223 ,  F16H2025/249

Abstract: A ball screw in the present invention includes a nut (1) having a spiral groove formed in an inner peripheral surface; a screw shaft (2) having a spiral groove formed in an outer peripheral surface; balls arranged between a raceway formed by the spiral groove of the nut and the spiral groove of the screw shaft; and a ball return passage for returning the balls from an end point of the raceway to a start point. The nut (1) includes a protruding portion (13) protruding from an axial end surface, and the ball return passage is a recessed portion formed in the inner peripheral surface of the nut. Deviation of the center of gravity of the nut (1) from a rotational center line caused by the protruding portion (13) is made smaller by the configuration of the recessed portion.

Abstract translation: 本发明的滚珠丝杠包括在内周面形成有螺旋槽的螺母（1） 螺旋轴（2），其具有形成在外周面中的螺旋槽; 布置在由螺母的螺旋槽形成的滚道和螺杆轴的螺旋槽之间的滚珠; 以及用于将球从滚道的终点返回到起点的球返回通道。 螺母（1）包括从轴向端面突出的突出部（13），球返回通路是形成在螺母的内周面的凹部。 通过凹部的构造使螺母（1）的重心与由突出部（13）引起的旋转中心线的偏差变小。

公开(公告)号：US20190316990A1

公开(公告)日：2019-10-17

申请号：US16317138

申请日：2017-06-13

Applicant: NSK LTD.

Inventor： Hiroshi KAWAHARA ,  Daisuke GUNJI ,  Fumiaki SODA ,  Koji HASHIMOTO

IPC: G01M17/013 ,  G01L5/16 ,  G01L5/13 ,  B60B1/14

Abstract: A wheel equipped with a sensing device includes a wheel and a sensing device. The sensing device includes a displacement extraction member, a to-be-detected part, and a detecting part. One radial end portion of the displacement extraction member is supported to one radial end-side portion of the wheel. The other radial end portion of the displacement extraction member is a free end. The to-be-detected part is provided to one of the other radial end-side portion of the wheel and the other radial end portion of the displacement extraction member. The detecting part is provided to the other of the other radial end-side portion of the wheel and the other radial end portion of the displacement extraction member, and is arranged in a vicinity of the to-be-detected part. An output of the detecting part changes in association with a change in positional relationship between the detecting part and the to-be-detected part.