JP4961446B2 - Rolling element cage - Google Patents

Description

  The present invention relates to a rolling element holder of a linear moving device, and more particularly to a holder installed between a slide way and a moving table for supporting and moving between moving tables by a circulation method.

  Until now, any linear guideway can be moved along a slide way by installing a moving table on the guideway. Further, in order to reduce the frictional force or noise, a reflux path for installing a rolling element is further provided between the slide way and the moving table, and the rolling body is usually a steel ball. . For this reason, when the circulation path is rotated, the service life is reduced due to continuous contact collision or friction. Therefore, a corresponding element holder has been devised, and each rolling element using the element holder is devised. As a device for limiting the position of the element, for example, there is a steel ball cage of US Patent Publication No. 2008 / 0000320A1. This steel ball cage is mainly formed with steel ball holding portions for accommodating steel balls on both sides of the inside, and both ends thereof are installed in an arcuate dish. The reason for installing both ends of the steel ball cage in an arcuate dish is that when the steel ball cage is bent at a curved portion, the steel ball cage is brought into contact with other steel ball cages smoothly, and the friction or interference is caused. It is provided to reduce. However, the steel ball cages that are in contact with each other did not rotate and no balls were installed, so it was necessary to improve the smoothness of rolling or noise. However, even if a steel ball is installed between two steel ball cages, there is a drawback that the steel ball cannot be held. Therefore, when the steel ball is rotated at a bent portion, the steel between the two steel ball cages The ball also has a drawback that it cannot rotate smoothly.

US Patent Publication No. 2008 / 0000320A1

  As described above, conventional double-type rolling element cages of the prior art can hold two steel balls smoothly, but both of the two contacted steel ball cages can rotate smoothly. In addition, since there was no installation of steel balls, it was necessary to further improve the smoothness of rolling or noise. And even if a steel ball is installed between two steel ball cages, there is also a drawback that when the steel ball comes to the bent part, it can not rotate smoothly, which is a technical problem to be solved by the present application. It is.

The present invention mainly provides a rolling element retainer. The cage includes an intermediate holding portion, two side holding portions installed on both sides of the intermediate holding portion, and a connecting portion that connects the intermediate holding portion and the side holding portion. The height of the intermediate holding part is equal to the height of the connecting part. In addition, two holding spaces are formed between the intermediate holding portion, the two side holding portions, and the connecting portion, and each of these holding spaces is provided for the installation of the rolling element and is rotated to the outer end surfaces of the holding portions on both sides. A groove is installed. Furthermore, the groove bottom surface of the rotating groove and the side surface of the connecting portion form a continuously extending surface. Alternatively, the direction in which the groove bottom surface of the rotating groove extends and the direction in which the side surface of the connecting portion extends form 90 degrees. Thereby, the cage of the combined rolling element can be rotated in the circulation path in accordance with the rolling element.

  The rolling element retainer of the present invention mainly has a gap between the rolling elements rotating at the circulation path when the rolling grooves of both rolling elements are in contact with one rolling element when the cage of each rolling element moves. It is possible to reduce the noise or improve the smoothness of movement, and at the same time, when the rolling element bends the curved portion, it is pushed by the contact between the rolling element and the rotating groove or on the rear rolling element. By being guided in the direction in which the rolling element is to be rotated, the cage of each rolling element and each rolling element can move to a predetermined optimum path, and there is a risk of biasing to an unexpected path. The smoothness of the movement is further increased.

FIG. The three-dimensional exploded view of the present invention. The solid combination figure of the other Example of this invention. The stereo exploded view of the other Example of this invention. The three-dimensional combination figure of one more Example of this invention. FIG. 3 is a three-dimensional combination diagram of still another embodiment of the present invention. FIG. 4 is an exploded view of yet another embodiment of the present invention. The solid combination figure of the last Example of this invention. The three-dimensional exploded view of the last Example of this invention. Sectional drawing which the rolling element holder | retainer of this invention rotates to a circulation path.

  In order to understand and recognize the object, features, and effects of the present invention more specifically, embodiments of the present invention will be described in detail below with reference to the drawings and reference numerals.

  First, with reference to FIG. 1 and FIG. 2, the rolling element holder | retainer concerning Example 1 provided with the holder | retainer 10 in which the two rolling elements 20 are installed is demonstrated.

The cage 10 includes an intermediate holding part 11, two side holding parts 12 installed on both sides of the intermediate holding part 11, and a connecting part 13 that connects the intermediate holding part 11 and the two side holding parts 12. The height of the intermediate holding part 11 is equal to the height of the connecting part 13. Further, both holding spaces 14 are provided between the intermediate holding portion 11, the two side holding portions 12 and the connecting portion 13. The holding space 14 is used for installing the rolling element 20. In addition, the rotation groove 15 is provided on the outer end surfaces of the two side holding portions 12, and the groove bottom surface of the rotation groove 15 and the side surface of the connecting portion 13 are flush with each other, that is, a surface that extends continuously .

  Next, referring to FIG. 3 and FIG. 4 together, a rolling element holder according to the second embodiment, which includes a holder 10A used for installing the two rolling elements 20A, will be described.

The retainer 10A includes an intermediate holding part 11A, two side holding parts 12A installed on both sides of the intermediate holding part 11A, and a connecting part 13A for connecting the intermediate holding part 11A and the two side holding parts 12A. The height of the intermediate holding portion 11A is equal to the height of the connecting portion 13A. Furthermore, both holding spaces 14A are provided between the intermediate holding portion 11A, the two side holding portions 12A, and the connecting portion 13A. The holding space 14A is used for installing the rolling element 20A. Further, the rotation groove 15A is provided on the outer end surfaces of the two side holding portions 12A, and the groove bottom surface of the rotation groove 15A and the side surface of the connecting portion 13A are formed flush with each other, that is, continuously extending . Further, concave holding surfaces 16A are provided on both sides of the intermediate holding portion 11A and one side of the side holding portion 12A.

  Furthermore, with reference to FIG. 5, the rolling element holder according to the third embodiment provided with a holder 10 </ b> B used for installing the two rolling elements 20 </ b> B will be described.

The cage 10B includes an intermediate holding portion 11B, two side holding portions 12B installed on both sides of the intermediate holding portion 11B, and a connecting portion 13B that connects the intermediate holding portion 11B and the two side holding portions 12B. The height of the intermediate holding part 11B is equal to the height of the connecting part 13B. Furthermore, both holding spaces 14B are provided between the intermediate holding portion 11B, the two side holding portions 12B, and the connecting portion 13B. The holding space 14B is used for installing the rolling element 20B. Moreover, the rotation groove 15B is installed in the outer end surface of the two side holding portions 12B. The direction in which the groove bottom surface of the rotating groove 15B extends and the direction in which the side surface of the connecting portion 13B extends are 90 degrees, and are concave on both sides of the intermediate holding portion 11B and on one side of the holding portions 12B. The holding surface 16B is provided.

  In addition, referring to FIG. 6 and FIG. 7 together, a rolling element holder according to the fourth embodiment, which includes a holder 10C used for installing two rolling elements 20C, will be described.

The cage 10C includes an intermediate holding part 11C, two side holding parts 12C installed on both sides of the intermediate holding part 11C, and a connecting part 13C that connects the intermediate holding part 11C and the two side holding parts 12C. The height of the intermediate holding portion 11C is equal to the height of the connecting portion 13C. Furthermore, both holding spaces 14C are provided between the intermediate holding portion 11C, the two side holding portions 12C, and the connecting portion 13C. The holding space 14C is provided for installing the rolling element 20C. Further, a rotation groove 15C is provided on the outer end surfaces of the two side holding portions 12C. The groove bottom surface of the rotating groove 15C and the side surface of the connecting portion 13C are flush with each other, that is, a continuously extending surface, and are concavely held on both sides of the intermediate holding portion 11C and one side of the side holding portion 12C. While providing the surface 16C, a through hole 17C is opened in the intermediate holding portion 11C and the holding portions 12C on both sides.

  In addition, referring to FIG. 8 and FIG. 9 together, a rolling element holder according to the fifth embodiment, which includes a holder 10D provided for installing two rolling elements 20D, will be described.

The cage 10D includes an intermediate holding portion 11D, two side holding portions 12D installed on both sides of the intermediate holding portion 11D, and a connecting portion 13D that connects the intermediate holding portion 11D and the two side holding portions 12D. The height of the intermediate holding part 11D is equal to the height of the connecting part 13D. Further, both holding spaces 14D are provided between the intermediate holding portion 11D, the two side holding portions 12D, and the connecting portion 13D. The holding space 14D is used for installing the rolling element 20D. Further, a rotation groove 15D is provided on the outer end surfaces of the two side holding portions 12D. The groove bottom surface of the rotating groove 15D and the side surface of the connecting portion 13D are flush with each other , that is, a surface that extends continuously . Further, the intermediate holding portion 11D and the side holding portion 12D or the connecting portion 13D has a stopper 16D. Is installed. The stopper 16D is used for holding the rolling element 20D.

  The rolling element cage of the present invention includes a screw shaft 30, a nut 40, a reflux element 50, and a rotation module 60 as shown in FIG. 3 and FIG.

  The screw shaft 30 is provided with a spiral groove 31 at its outer edge.

  The nut 40 is provided with a perforation 41 for inserting the screw shaft 30, and a spiral tank 42 corresponding to the spiral groove 31 is provided at the inner edge of the perforation 41, and the spiral groove 31 and the spiral tank 42 are loaded. A path 40A is configured.

  The reflux element 50 is mounted on the nut 40, and a reflux path 51 is installed in the reflux element 50. The reflux path 51 is connected to the load path 40A to form a complete circulation path 50A.

  At the same time, the rotation module 60 is installed in the circulation path 50A. The rotation module 60 includes a plurality of cages 10 </ b> A and rolling elements 20. The retainer 10A includes an intermediate holding part 11A, two side holding parts 12A installed on both sides of the intermediate holding part 11A, and a connecting part 13A that connects the intermediate holding part 11A and the holding parts 12A on both sides. Then, both holding spaces 14A are provided between the intermediate holding portion 11A, the two side holding portions 12A, and the connecting portion 13A. The holding space 14A is used for installing the rolling element. Further, when the rotation groove 15A is installed on the outer end surfaces of the two side holding portions 12A and the plurality of cages 10A are installed in the circulation path 50A, each rolling element 15A of each of the plurality of cages 10A has another rolling element. 20A is installed.

  According to the structure of the specific embodiment, the following effects can be obtained. When the cage 10 (10A, 10B, 10C or 10D) of each rolling element of the present invention moves, the rolling elements 15 (15A, 15B, 15C or 15D) at both ends move to the moving element 20 (20A, 20B, 20C or 20D). ) And the clearance with the circulation path 50A hardly occurs, so that noise is reduced and the smoothness of the movement is improved and the rolling element 20 (20A, 20B, 20C or 20D) bends the curved portion. When the rolling element 20 contacts with the rotation groove 15 (15A, 15B, 15C or 15D) or is pushed by the rear rolling element, the rolling element 20 (20A, 20B, 20C or 20D) is guided in the direction to rotate. As a result, each rolling element holder 10 (10A, 10B, 10C or 10D) and each rolling element 20 (2 A, 20B, 20C or 20D) may be moved to a predetermined optimal route, possibility of biased unexpected path without any, smooth degree of the movement is further enhanced.

DESCRIPTION OF SYMBOLS 10 Cage 11 Intermediate cage 12 Both-side cage 13 Connection part 14 Holding space 15 Rotating groove 20 Rolling element 10A Cage 11A Intermediate holding part 12A Side holding part 13A Connecting part 14A Holding space 15A Rotating groove 16A Holding surface 20A Rolling element 10B Cage 11B Intermediate holding part 12B Side holding part 13B Connection part 14B Holding space 15B Rotating groove 16B Holding surface 20B Rolling element 10C Cage 11C Intermediate holding part 12C Side holding part 13C Connecting part 14C Holding space 15C Rotating groove 16C Holding surface 17C Hole 20C Rolling element 10D Cage 11D Intermediate holding part 12D Side holding part 13D Connection part 14D Holding space 15D Rotating groove 16D Stopping part 20D Rolling element 30 Screw shaft 31 Spiral groove 40 Nut 40A Load path 41 Drilling 42 spiral chamber 50 wheel elements 50A circulation path 51 reflux passage 60 rotation module

Claims (3)

A screw shaft provided with a spiral groove on the outer edge;
A perforation for inserting the screw shaft is provided, and a spiral tub corresponding to the spiral groove is provided at an inner edge of the perforation, and the spiral groove and the spiral tub include a nut constituting a load path,
A reflux element installed on the nut, providing a reflux path, the reflux path abutting against the load path and constituting a complete circulation path;
A rolling element holder installed in the circulation path and used for a ball screw provided with a rotating module composed of a plurality of cages and rolling elements,
The cage includes an intermediate holding portion, a side holding portion installed on both sides of the intermediate holding portion, and a connecting portion that connects the intermediate holding portion and the side holding portion, the intermediate holding portion, the side holding portion, and the connection. Both holding spaces between the portions, the holding spaces are provided for the installation of the rolling element, and a rotation groove is installed on the outer end surface of the side holding portion ,
The direction of extension of the groove bottom surface of the rotary groove, and the direction of extension of the side surface of the connecting portion, that not make 90 degrees,
A rolling element retainer. A screw shaft provided with a spiral groove on the outer edge;
A perforation for inserting the screw shaft is provided, and a spiral tub corresponding to the spiral groove is provided at an inner edge of the perforation, and the spiral groove and the spiral tub include a nut constituting a load path,
A reflux element installed on the nut, providing a reflux path, the reflux path abutting against the load path and constituting a complete circulation path;
A rolling element holder installed in the circulation path and used for a ball screw provided with a rotating module composed of a plurality of cages and rolling elements,
The cage includes an intermediate holding portion, a side holding portion installed on both sides of the intermediate holding portion, and a connecting portion that connects the intermediate holding portion and the side holding portion, the intermediate holding portion, the side holding portion, and the connection. Both holding spaces between the portions, the holding spaces are provided for the installation of the rolling element, and a rotation groove is installed on the outer end surface of the side holding portion,
The groove bottom surface of the rotating groove and the side surface of the connecting portion form a continuously extending surface ,
A rolling element retainer. Between the cage, the cage of the rolling element according to claim 1 or claim 2, wherein that you have made to comprise other rolling elements.

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