公开(公告)号：US6082209A

公开(公告)日：2000-07-04

申请号：US941305

申请日：1997-09-30

申请人： Takayuki Yabe ,  Nobuhide Kurachi

发明人： Takayuki Yabe ,  Nobuhide Kurachi

IPC分类号： F16H25/22 ,  F16H25/24

CPC分类号： F16H25/2204 ,  Y10T74/19753 ,  Y10T74/19902

摘要： A ball screw includes a screw shaft 2 having an external ball-screw thread 2a, at least one ball nut 3 having an internal ball-screw thread which is opposite to the external ball-screw thread 2a of the screw shaft 2, a spiral raceway formed by combination of the internal ball-screw thread of the ball nut 3 and the external ball-screw thread 2a of the screw shaft 2, a plurality of balls which are circulated through the spiral raceway, and ball return paths 5, 6, and 7 for the plurality of balls. The ball screw also includes three or more circulation circuits X, Y, Z made by the spiral raceway and the ball return paths 5, 6, and 7 formed in the ball nut 3. Of the three or more three circulation circuits X, Y, Z, at least two circulation circuits are arranged so as to be in phase with each other in the circumferential direction of the ball screw 3, and the remaining circulation circuit is positioned so as to be 180 degree out of phase with the two circulation circuits in the circumferential direction. Accordingly it is possible to provide a compact ball screw having heavy load carrying capacity without increasing the size of the ball screw by averaging dispersions in the distribution of loads on the ball screw, and by reducing stress concentrated on the balls placed in a specific position.

摘要翻译： 滚珠丝杠包括具有外部滚珠丝杠2a的螺杆轴2，至少一个滚珠螺母3，其具有与螺杆轴2的外部滚珠丝杠2a相对的内部滚珠丝杠，螺旋滚道 通过滚珠螺母3的内部滚珠丝杠和螺杆轴2的外部滚珠丝杠2a的组合形成的多个滚珠，其通过螺旋滚道循环，滚珠返回路径5,6和 7用于多个球。 滚珠丝杠还包括由螺旋滚道制成的三个或更多个循环回路X，Y，Z，以及形成在滚珠螺母3中的滚珠返回路径5,6和7。在三个或更多个三个循环回路X，Y， Z，至少两个循环回路在滚珠丝杠3的圆周方向上彼此相位配置，并且剩余循环回路与两个循环回路相位相差180度 圆周方向。 因此，可以通过平均在滚珠丝杠上的载荷分布中的分散，并且通过减少集中在放置在特定位置的球上的应力来提供具有重的承载能力的紧凑的滚珠丝杠，而不增加滚珠丝杠的尺寸。