JP2008128388A - Recirculating system of ball screw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of breakage of a spiral rail tooth groove by fitting of a fixing part due to a conventional small curvature radius of a recirculating passage by designing a recirculating element, and improve the smoothness of flowing circulation of a ball by increasing the curvature radius of the recirculating passage. <P>SOLUTION: The system comprises a screw, a nut, a plurality of recirculating elements and a ball, the fixing part of the nut has a section to be fitted in conformation to the recirculating element in the axial direction, and the section includes a continuous tapered hole connecting with a through hole and formed so as not to interfere with a spiral rail. The recirculating element includes a turning structure corresponding to the tapered hole protrusively provided at an opening part connecting with the through-hole, the turning structure being fitted in conformation to the tapered hole. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a ball screw reflux system, and more particularly, to a ball screw reflux system that provides a cross-section in which continuous pores are provided along an axial direction with respect to a fixed portion. More specifically, the present invention provides a turning structure and a cross-sectional arrangement for projecting the reflux element, and the fixed portion increases the radius of curvature of the reflux path without interfering with the spiral rail. The present invention relates to a ball screw reflux system.

  In the first place, the ball screw is fitted to the screw with a nut, and the ball circulates and rotates relative to the inner side of the screw and the nut to move relative to each other.

  A recirculation element is mounted on the internal thread of the nut to recirculate the ball so that the ball is recirculated during circulation between the screw and the nut, thereby constituting a general circulation rotation.

  Speaking of the ball recirculation method of the ball screw so far, one of them is the external circulation recirculation that leads the ball to the outside of the nut, the internal recirculation recirculation where the ball directly recirculates in the internal thread inside the nut, or the internal thread of the nut There is a method in which the ball is guided to the opening of the nut and refluxed.

  As shown in FIGS. 1 and 2, for the ball screw that recirculates by the end cover type, the recirculation element 10 mounted therein includes a localization portion 101, an introduction end 102, and a refraction end that are tightened on a nut by a tightening element. The structure of the reflux path 104 formed by connecting 103 is required. If the lead of the ball screw is not designed so that the lead of the ball screw is not so small, if the lead or the tooth tip becomes too small, the next tooth tip structure will be destroyed.

  As shown in FIG. 3 and FIG. 4, in order to solve the problem that the tooth tip is destroyed, a contractor forms a tooth profile 201 that specifically compensates a part on the reflux element 20 that joins both structures, With this part of the compensation tooth profile 201, a complete tooth profile can be formed by the broken tip portion of the ball screw.

  However, since the reflux element 20 of the designed compensation tooth profile 201 is simply a combination of the two structures 202 and 203, the inside of the reflux element 20 attempts to reflux the ball. Therefore, if the direction changing path of the return element 20 is too small and the direction changing path of the return element 20 is too small, rotation in the return path of the ball is unordered.

  In detail, either the integral structure of the reflux element or the separate structure of the reflux element described later includes a part of the compensation tooth profile 105 on the refraction end 103 positioned in the rotation path, as shown in FIG. However, since the arcuate radius (R value) formed by the refracting end 103 is small, the ball passes through the reflux path. It cannot rotate smoothly. For this reason, the ball and the screw or between the ball and the nut influences the predetermined circulation movement relationship, and further, the mechanical efficiency of the ball screw is reduced.

  The present invention has been devised in view of the drawbacks of the structural design of the conventional reflux element itself, and has been devised by improvement. After many years of research, the ball screw reflux element of the present invention has been successfully researched and developed.

  The object of the present invention is to solve the problem that the fixing portion does not break the tooth groove of the spiral rail and avoids interference by avoiding the spiral rail, and at the same time, by increasing the curvature radius of the return path, It is an object of the present invention to provide a ball screw reflux system capable of effectively improving the smoothness in exercise.

  The recirculation system for a ball screw according to the present invention mainly includes a screw, a nut, a plurality of recirculation elements, and a ball, and the fixing portion of the nut is fitted in the axial direction corresponding to the recirculation element. A cross-section is provided, the cross-section is provided with a continuous leading pore connecting the through-hole, and the cross-section and the spiral rail are prevented from interfering with each other, and the reflux element is provided in an opening connecting the through-hole. A direction changing structure corresponding to the tip pore is protruded, and the direction changing structure is fitted to the tip pore.

  In addition, the design of the other second embodiment can be adopted for the reflux element of the ball screw. For example, the reflux element is two separable structures along its axial direction, and has a tail groove. It is possible to adopt a fixed connection in a manner in which the tenons are fitted to each other.

  Further, the design of the third embodiment can be adopted for the reflux element of the ball screw. For example, the reflux element is two separable structures along the axial direction, and the hole and the pin are mutually connected. It is possible to adopt a fixed connection in a fitting manner.

  The recirculation system for a ball screw according to the present invention provides a direction changing structure or a cross-section fitting for projecting a recirculation element, in particular, by a cross section of a continuous front pore disposed along the axial direction of a fixed portion. It can solve the problem that the fixed part does not break the tooth space of the spiral rail and avoids interference by avoiding the spiral rail, and at the same time, by increasing the curvature radius of the return path, The smoothness can be effectively improved. In addition, the design of such a reflux element can solve the problem of breaking the spiral rail tooth groove by fitting the fixed portion with a small radius of curvature of the conventional reflux path, and can improve the smoothness in which the ball flows and circulates between them, The ball screw can exert a substantial effect on use.

  In order to clearly describe the implementation of the present invention, the implementation method of each embodiment will be described as follows. As shown in FIGS. 5 to 10, the ball screw reflux system designed by the present invention mainly includes a screw 1, a nut 2, a plurality of reflux elements 3, and a ball 4. The outer surface of the nut 1 and the inner surface of the nut 2 are provided with spiral rails 11 and 21 that are aligned with each other, and at least a through hole 22 is provided inside the nut 2. At least one fixing portion 23 for fitting and fitting the reflux elements 3 to the surfaces is provided. The reflux element 3 has a reflux path 31 and an opening, which are connected to the through hole 22 of the nut 2 and the spiral rail 21, respectively. The ball 4 is circulated by an independent loop composed of the spiral rails 11 and 21 of the screw 1 and the nut 2 which are combined with each other and the reflux path 31 of the reflux element 3.

  Among them, the fixing portion 23 of the nut 2 is provided with a cross-section 21 for fitting the reflux element 3 correspondingly along the axial direction, and the cross-section 21 is a continuous for connecting the through hole 22. The front hole 25 is provided, and the cross section 24 and the spiral rail 21 do not interfere with each other. Further, the direction change structure 32 and the tip hole 25 are fitted by projecting the direction change structure 32 corresponding to the tip hole 25 at the opening where the reflux element 3 connects the through hole 22. As described above, the positions of the respective elements according to the first embodiment of the present invention and their outlines are described.

  As shown in FIG. 8, the present invention is a cross-sectional view of A-A ′ combining a reflux element and a nut designed here. As shown in FIG. 9 and FIG. 10 together, the conventional end plugs cannot make the lead angle too small due to the design principle of the ball screw. The reason is that if the lead angle is small, the relative tooth profile will also be small, and the next complete tooth profile will be destroyed. Therefore, when the direction change path of the return element is small, the ball is likely to be out of rotation in the return path.

  As described above, the design of the return element has a small return path curvature radius and can solve the problem of breaking the spiral rail tooth groove by fitting the fixed portion. However, it is possible to improve the smoothness of fluid circulation in the meantime, and the ball screw can exhibit a substantial effect in use.

  Furthermore, as shown in FIG. 11 and FIG. 12, the structure of the reflux element designed here is not limited to the integrally configured type, and the following types of designs are also possible.

  First, the other modified embodiments relating to the reflux element of the first embodiment can adopt the design of the other second embodiment with respect to the reflux element of the ball screw. The separable structure is divided and a fixed coupling is adopted in a manner in which the tail groove 33 and the dovetail 34 are fitted to each other.

  In addition, as another example of the change related to the reflux element of the second embodiment, the design of the other third embodiment can be adopted for the reflux element of the ball screw. A stereotactic coupling is adopted in which the separable structure is divided and the hole 35 and the pin 36 are fitted together.

  As described above, the present application has certain novelty in the spatial form, can enhance the above-mentioned many effects than the conventional one, and sufficiently meets the requirements of the legal invention of novelty and inventive step. Therefore, the application should be granted as an invention patent by submitting an application by law.

The appearance sketch between the conventional reflux element and the nut. The front view of the conventional reflux element. The structure sketch of the other other reflux element. The sectional view of the combination between other conventional reflux elements and nuts. The combination figure of the external appearance structure of the reflux element of this invention. The exploded view of the local structure of the reflux element of this invention. The combination figure of the local structure of the reflux element of this invention. Sectional drawing of A-A 'which combined the reflux element and nut of this invention. FIG. 9 is an exploded cross-sectional view of the cross-sectional structure taken along the line A-A ′ of FIG. 8. FIG. 9 is a combined sectional view of the sectional structure taken along the line A-A ′ of FIG. 8. The exploded view of the external appearance structure of 2nd Example in the reflux element of this invention. The exploded view of the external appearance structure of 3rd Example in the reflux element of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Reflux element 101 Localization part 102 Introduction end 103 Refraction end 104 Reflux path 105 Tooth shape 20 Reflux element 201 Tooth shape 202, 203 Structure 1 Screw 2 Nut 3 Reflux element 4 Ball 11 Spiral rail 21 Spiral rail 22 Through-hole 23 Fixed part 24 cross section 25 tip pore 31 reflux path 32 direction change structure 33 tail groove 34 dovetail 35 hole 36 pin

Claims (5)

A screw, a nut, a plurality of reflux elements, and a ball, wherein the outer surface of the screw and the inner surface of the nut are provided with a spiral rail aligned with each other, and have at least one through hole in the nut; The through holes are provided in order to provide at least one return element on both end faces of the nut and fit the fixing part, and have a return path and an opening inside the return element, the opening being a through hole of the nut. And a spiral rail connected to each other, and by an independent loop consisting of a spiral rail of the screw and nut and a return path of the return element, the ball is circulated,
The fixing portion in the nut is provided with a cross-section for fitting in the axial direction corresponding to the reflux element, the cross-section is provided with a continuous leading pore connected to the through hole, and the cross-section is spiral So as not to interfere with the rails, and
In the reflux element, a direction changing structure corresponding to the tip pore is installed in an opening connecting the through hole, and the direction changing structure is fitted in correspondence to the tip pore. .   2. The ball screw reflux system according to claim 1, wherein a diameter of the opening of the direction changing structure is smaller than a diameter of the opening of the tip pore.   2. The ball screw reflux system according to claim 1, wherein the spiral rail of the nut and the reflux path of the reflux element are connected continuously and smoothly.   2. The ball screw according to claim 1, wherein the reflux element is a two-separable structure along an axial direction thereof, and is a fixed coupling that employs a method of fitting the tail groove and the dovetail together. Reflux system.   2. The ball screw reflux system according to claim 1, wherein the reflux element has two separable structures along an axial direction thereof, and is a fixed coupling that employs a system in which a hole and a pin are fitted to each other. .

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