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CN-116981854-B - Linear motion guide device

CN116981854BCN 116981854 BCN116981854 BCN 116981854BCN-116981854-B

Abstract

The linear motion guide device includes a guide rail, a slider guided by the guide rail in the 1 st axial direction, and a rolling element capable of rolling in a circulation path including a rolling path defined between the guide rail and the slider, a return path provided in the slider, and a direction switching path connecting the rolling path and the return path. The return passage has a through hole extending in the 1 st axial direction in the slider and a return guide member disposed in the through hole. The return guide member includes an arcuate outer surface facing a part of an inner peripheral surface of the through hole in a predetermined surface orthogonal to the central axis of the through hole, an inner surface at least a part of which is in contact with the rolling elements, a1 st end surface connecting one end portion of the central axis of the outer surface in the circumferential direction with the inner surface, and a2 nd end surface connecting the other end portion of the central axis of the outer surface in the circumferential direction with the inner surface and separated from the 1 st end surface.

Inventors

  • MIZUMURA YOSHINORI
  • KAWAKAMI KOICHI

Assignees

  • 日本精工株式会社

Dates

Publication Date
20260512
Application Date
20220329
Priority Date
20210331

Claims (9)

  1. 1. A linear motion guide device, wherein, The linear motion guide device is provided with: a guide rail; A slider guided by the guide rail in the 1 st axial direction, and A rolling element capable of rolling in a circulation path including a rolling path defined between the guide rail and the slider, a return path provided inside the slider, and a direction switching path connecting the rolling path and the return path, The return passage has a through hole extending in the 1 st axial direction in the slider and a return guide member disposed in the through hole, The return guide member includes an arcuate outer surface facing a part of an inner peripheral surface of the through hole in a predetermined surface orthogonal to a central axis of the through hole, an inner surface at least a part of which is in contact with the rolling element, a1 st end surface connecting one end portion of the outer surface in a circumferential direction of the central axis with the inner surface, and a2 nd end surface connecting the other end portion of the outer surface in the circumferential direction of the central axis with the inner surface and separated from the 1 st end surface, The inner surface includes, on the predetermined surface, a circular arc region, a1 st straight line region, and a2 nd straight line region, the 1 st straight line region being connected to one end portion of the circular arc region in the circumferential direction of the central axis and extending in the tangential direction of the rolling element, and the 2 nd straight line region being connected to the other end portion of the circular arc region in the circumferential direction of the central axis and extending in the tangential direction of the rolling element.
  2. 2. The linear motion guide device according to claim 1, wherein, In the predetermined surface, a curvature of the circular arc region is smaller than a curvature of the rolling element.
  3. 3. The linear motion guide device according to claim 2, wherein, The contact point between the rolling element and the inner surface is defined at least at one of the boundary between the circular arc region and the 1 st straight line region and the boundary between the circular arc region and the 2 nd straight line region.
  4. 4. The linear motion guide device according to claim 2, wherein, In the predetermined plane, the 1 st straight line region and the 2 nd straight line region are parallel.
  5. 5. The linear motion guide device according to any one of claims 1 to 4, wherein, The rolling elements are in contact with the inner peripheral surface between the 1 st end surface and the 2 nd end surface.
  6. 6. The linear motion guide device according to any one of claims 1 to 4, wherein, The outer surface is opposed to a support region defined as at least half of the inner peripheral surface in a circumferential direction of the central axis.
  7. 7. The linear motion guide device according to any one of claims 1 to 4, wherein, The return passage is provided at a position outside the rolling passage with respect to a center of the slider in a 2 nd axis direction orthogonal to the 1 st axis direction of the predetermined surface, An opening between the 1 st end face and the 2 nd end face is arranged at a position outside the central axis in the 2 nd axis direction.
  8. 8. The linear motion guide device according to any one of claims 1 to 4, wherein, The return guide member includes a1 st return guide member and a2 nd return guide member connected to an end of the 1 st return guide member in the 1 st axial direction.
  9. 9. The linear motion guide device according to any one of claims 1 to 4, wherein, The slider includes a slider body provided with the through hole, an end cap connected to an end of the slider body in the 1 st axial direction, and a return guide disposed between the slider body and the end cap in such a manner as to oppose the end cap, The direction switching path is defined between the end cover and the return guide, The return guide member is integral with at least one of the return guide and the end cap.

Description

Linear motion guide device Technical Field The present disclosure relates to a linear motion guide device provided in a guide portion of a machine tool, a manufacturing apparatus, a measuring apparatus, or the like, and configured to linearly move a moving member such as a table. Background The linear motion guide device is composed of a guide rail, a slider, and a plurality of balls, wherein the guide rail extends in the axial direction, ball rolling grooves are formed on both side surfaces of the guide rail, the slider is arranged in a manner of crossing the guide rail, the ball rolling grooves are positioned at positions opposite to the ball rolling grooves of the guide rail, both ends of a ball return circuit are formed in parallel with the ball rolling circuit, and a direction conversion circuit of the balls connects both ends of the ball rolling circuit and the ball return circuit, and the plurality of balls are arranged in a ball circulation circuit formed by the ball rolling grooves of the guide rail and the ball rolling grooves of the slider, the ball return circuit, and the direction conversion circuit. The slider is composed of a slider body formed with a ball rolling groove and a ball return path, and end caps formed with a direction change path and fixed to both axial end faces of the slider body. In the technical field of linear motion guide devices, a linear motion guide device including a slider body having a return passage for rolling elements as disclosed in patent document 1 is known. In patent document 1, the return passage has a through hole provided in the slider body and a return guide member disposed in the through hole. Even if the inner diameter of the through hole is large, the return guide member can be disposed in the through hole to roll the small-diameter rolling element in the return passage. Since it is not necessary to reduce the inner diameter of the through hole, a decrease in workability in forming the through hole is suppressed. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 2008-175263 Disclosure of Invention Problems to be solved by the invention Although the return guide member is disposed in the through hole without reducing the inner diameter of the through hole, when the linear motion guide device is required to be miniaturized, it is preferable that the inner diameter of the through hole is small. A technique is desired that enables the return guide member to be smoothly disposed in the through hole even when the inner diameter of the through hole is reduced. The purpose of the present disclosure is to provide a linear motion guide device in which the reduction in workability and the increase in size when a return guide member is disposed in a through hole is suppressed. Solution for solving the problem A linear motion guide device according to an aspect of the present disclosure includes a guide rail, a slider guided by the guide rail in a 1 st axial direction, a rolling element capable of rolling in a circulation path including a rolling path defined between the guide rail and the slider, a return path provided in an interior of the slider, and a direction conversion path connecting the rolling path and the return path, the return path having a through hole extending in the 1 st axial direction in the interior of the slider and a return guide member disposed in the through hole, the return guide member including an arcuate outer surface facing a part of an inner peripheral surface of the through hole in a predetermined surface orthogonal to a central axis of the through hole, an inner surface contacting at least a part of the rolling element, a 1 st end surface connecting one end portion of the central axis of the outer surface in a circumferential direction with the inner surface, and a2 nd end surface connecting the other end portion of the central axis of the outer surface in the circumferential direction with the inner surface and separated from the 1 st end surface. According to the above, by forming the return guide member so as to have the 1 st end face and the 2 nd end face separated from the 1 st end face, the return guide member can be elastically deformed so that the outer diameter of the return member becomes small. Therefore, even if the inner diameter of the through hole is small, the return guide member can be inserted into the through hole while being elastically deformed. This suppresses a decrease in workability when the return guide member is disposed in the through hole. Further, since the inner diameter of the through hole can be made small, for example, even when a plurality of return passages are provided adjacently on a predetermined surface, the linear motion guide device can be prevented from becoming large. As a desirable aspect of the linear motion guide device of the present disclosure, the inner surface may include, in the predetermined surface, a circular arc region, a1 st linear region, and