JP2008025675A - Ball screw equipped with locking back-flow end plug - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an attachment of a ball screw which can achieve a low noise and a stable fixing effect, and is equipped with a locking back-flow end plug. <P>SOLUTION: This ball screw is equipped with the locking back-flow end plug, and includes a nut, a screw and a back-flow end plug. Locking grooves and locking blocks are formed on facing faces of the nut and the back-flow end plug, respectively, and an elastic connector for connecting the locking grooves or the locking blocks is previously formed at the back-flow end plug. By this, since a limit for fixing the back-flow end plug on the nut by using a conventional fastening element can be released, the cost of the fastening is reduced accompanied by a reduction in the number of the elements, the elastic connector of the back-flow end plug is improved in its assembling usability, and furthermore, since a back-flow passage of the back-flow end plug employs the design of a coated type, a collision of a ball and the nut is avoided, and thus the generation of noise can be suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a ball screw attachment, and more particularly to a ball screw provided with an engagement reflux end plug. Thereby, a low noise and stable fixing effect can be achieved.

Ball screws are now being used in many industrial applications, but in addition to providing high precision effects as linear feed transmission, they also have a low frictional wear rate, high energy conversion rate, low noise, and high rigidity. Needless to say, the ball screw is actually important for each industrial application machine and the like because it has the advantage of being difficult to damage.

  In the conventional ball screw design, in order to continuously circulate the ball between the screw and the nut and relieve the stress, both ends of the nut are fitted with a reflux end plug corresponding to the screw thread and the ball. It is necessary to install. The reflux end plug is used as a key point for causing the ball inside the ball screw to operate mainly between the screw and the nut and refluxing after completion. Therefore, it can be seen how important research and development for reflux end plugs is to the industry to improve more competitive products.

  Conventionally used or recognized reflux end plugs are divided into both types, see the description below. Conventional ball screws are mainly composed of screws, nuts and balls.

  Commonly used ball circulation systems include an internal circulation system, an external circulation system, and an end plug system.

  In the internal circulation system, each ring constitutes one circulation, so that a smaller resistance force or wear can be obtained. However, when it is necessary to receive a larger load, it is necessary to adopt an external circulation type ball screw. However, in the external circulation method, a curved pipe that guides the reflux of the ball is installed on the outer peripheral surface of the nut. However, in order to achieve the demand for a heavy load, the nut size must be large and the nut is small. Since end plug type ball screws must be adopted, such end plug type ball screws are now an important target product while being researched and developed by the industry.

  As shown in the drawing of US Pat. No. 4,357,838 shown in FIG. 1, the prior art disclosed in FIG. 1 is an end plug type ball screw having a reflux end plug. The return end plug 12 is fixed to the end of the spiral concave groove of the nut 11 using the mounting groove 111 on the screw 10 and the nut 11, and the balls are sequentially used by using the open type return path 121 of the return end plug 12. Introduced to reflux. Such conventional products still have some problems even if they are put to practical use, and need to be researched, developed and improved.

  One of the prior arts is that, in assembly, first, after the reflux end plug 12 is attached to the attachment groove 111, the screw 10 is passed through the radial fastening hole 112 on the nut 11, and again by the screw 10. Since it is necessary to fasten the reflux end plug 12 onto the nut 11, such an attachment process is very complicated and inconvenient and needs to be improved.

  The second and other prior arts are that the reflux path 121 manufactured in the body of the reflux end plug 12 is an open type design, so that the metal nut is still in the process of bending the metal ball when the ball is refluxed. Since it generates noise by hitting it in contact with 11, it needs to be improved.

  In response to the above problems, other end plug ball screws have been devised in the market, with reference to US Pat. No. 5,664,592 shown in FIG. That is, the reflux end plug 14 is fixed on the ball screw nut 15 using the C-shaped hook ring 13, and the assembly as in this system is performed by attaching the reflux end plug 14 to one fixing groove 151 of the nut 15. The C-shaped hook ring 13 is locked in the locking groove 152 of the nut 15 and the reflux end plug 13 is tightened to achieve the fixing effect. Such a design is still described below. Problems arise.

  On the other hand, the conventional assembling has a problem of complicated assembling, and the C-shaped hook ring 13 element has to be additionally installed, so it needs to be improved.

  Second, since the reflux path 141 of the conventional reflux end plug 14 is an open path, when the ball is rotated by this open design system, the metal ball and the metal nut 15 come into contact with each other and collide with each other. Therefore, noise is generated and needs to be improved.

In order to effectively solve the problems related to the above, the inventors of the present application have made use of research and development technology and experience accumulated over many years in the ball screw region, and from the angle of its assembly strength and ease of removal, it has been gradually innovative. A ball screw equipped with a reflux end plug for engagement could be developed and devised.
U.S. Pat. No. 4,357,838 US Pat. No. 5,664,459

  An object of the present invention is to provide a ball screw including a return end plug for engagement that mainly reduces the number of elements and improves the assembling convenience.

  Next, an object of the present invention is to provide a ball screw including an engagement reflux end plug that can effectively reduce noise.

  In order to achieve the above object, the opposing surfaces of the nut and the return end plug according to the present invention are respectively formed with an engagement groove and an engagement lump, and the return end plug is provided with an elastic connection portion in advance. Connect the groove or engaging mass.

  In order to achieve the following object, the ball screw of the present invention adopts a coating type design for the reflux path of the reflux end plug.

  As a result, according to the present invention, the return end plug does not need to be fitted to other members and can be fixed on the nut, the cost thereof is reduced as the number of elements decreases, and the return end plug elastic connection portion is assembled. The convenience of attaching can be improved.

  In addition, the ball that has entered the return end plug can be separated from the nut and the noise without colliding with the metal nut to reduce noise.

  By enumerating the preferred embodiments, including the techniques, means and other effects used to achieve the above-mentioned object relating to the present invention, together with the drawings, the objects of the present invention will be described in detail as follows. I am confident that the features and other advantages can thereby be understood more deeply and concretely.

  Referring to the embodiment of the present invention shown in FIGS. 3-5, the embodiment of the present invention includes a nut 20, a screw (not shown), a reflux end plug 30, and a number of balls (not shown). Of which

  The nut 20 includes a through hole 21 penetrating in the axial direction, a reflux hole penetrating the side (not shown), and a spiral groove 22 spirally surrounding the inside. A concave receiving groove 23 is formed in the spiral groove 22 and the reflux hole portion corresponding to the end face of the nut 20, and an engaging groove 24 recessed outside the receiving groove 23 is provided around.

  The screw penetrates the through hole 21 of the nut 20, and the screw and the spiral groove 22 of the nut 20 form a space for accommodating a relatively large number of balls,

  The reflux end plug 30 is fitted and disposed in the recessed receiving groove 23 of the nut 20, and the reflux end plug 30 is provided with a covered reflux path 31. The spiral groove 22 provided so as to be in close contact with 20 is provided with a sheet-like guide plate 311, and the reflux holes 31 are connected by the spiral groove 22 in the guide nut 20 to which the covered reflux path 31 corresponds. . The reflux end plug 30 is provided with an elastic connecting portion 32 that protrudes slightly and extends, and an engaging lump 33 that slightly protrudes using the end of the elastic connecting portion 32 is integrally connected. The shape of the engaging lump 33 is as follows. An inclined surface 331 is provided in the direction of the engaging groove 24 corresponding to the engaging groove 24 of the nut 20 and the engaging lump 33 corresponds, and an abutting surface 332 is provided on the inclined surface 331. As mentioned above, each correlated element of the present invention is an interrelated position or description thereof.

  Among them, the relative positions where the protruding engagement mass 33 of the reflux end plug 30 and the recessed engagement groove 24 of the nut 20 are manufactured can be changed by design. The elastic connection portion 32 of the reflux end plug 30 can also be integrally formed with the engaging groove 24, and here, the technique described above is only one of simple replacement methods. To do.

  In order to clearly describe the implementation features of the present invention, it will be described that the ball screw of the engagement reflux end plug has an inventive step or a practicality as compared with the conventional one.

  When installing the ball screw of the present invention, first, the user penetrates the screw into the nut 20, and the spiral groove 22 of the screw and the nut 20 forms a space for accommodating a relatively large number of balls. The In this case, the assembled end plug 30 is inserted directly into the concave receiving groove 23 of the nut 20 in the axial direction from the end face of the nut 20, and further pressed in the axial direction along the concave receiving groove 23. To localize. At this time, the projecting engagement mass 33 of the reflux end plug 30 is fitted into the engagement groove 24 of the nut 20 without interference by operating and deforming the inclined surface 331 and the elastic connection portion 32, and is positioned. Further, the projecting engagement mass 33 of the reflux end plug 30 is limited to the contact surface 332 and abuts in the receiving groove 23, so that the engagement mass 33 is fitted in the engagement groove 24. The reflux end plug 30 is axially localized on the end face of the nut 20.

  As a result, in the assembly according to the present invention, the projecting engagement mass 33 of the reflux end plug 30 rapidly deforms the inclined surface 331 and the elastic connection portion 32 to deform the engagement groove of the nut 20 without interference. 24 can be assembled. Since there is no need to purchase or produce other clamping elements, the present invention can reliably provide a ball screw with a return end plug for engagement that reduces the number of elements and facilitates assembly.

  On the other hand, the recirculation end plug 30 of the present invention is provided with a covering recirculation path 31, and the covering recirculation path 31 has a spiral groove 22 provided in close contact with the nut 20. In the present invention, a pulling plate 311 is provided, and a reflux hole is connected by a spiral groove 22 in the guiding nut 20 to which the coated reflux path 31 corresponds, and the guiding plate 311 separates the ball and the nut 20. It is possible to reduce the generation of noise by effectively separating the collision between the ball and the nut so that the ball entering the reflux end plug does not collide with the metal nut.

  Further, referring to other embodiments of the engagement groove shown in FIGS. 6 and 7, the concave engagement groove 24 of the nut 20 in the present invention is installed in a state of being recessed in a separate body (as described above, the ring Also, the shape of the engagement groove 24 corresponds to the engagement mass 33 of the elastic connection portion 32 of the return end plug 30, so that each of the advantages of the present invention can be achieved. Since it can be exhibited similarly, it should belong to the protection category of the present invention.

  In general, the ball screw having the reflux end plug for engagement according to the present invention includes a nut, a screw, and a reflux end plug, and an engagement groove and an engagement mass are produced on the relative surfaces of the nut and the reflux end plug, respectively. And an elastic connecting portion for connecting the engaging groove or the engaging lump to the reflux end plug. Therefore, the cost is reduced as the number of elements decreases, and the elastic connection portion of the reflux end plug can improve the convenience of assembly. Further, by adopting a cover-type design for the return path of the return end plug, the collision between the ball and the nut is separated, and the generation of noise can be reduced. Therefore, it goes without saying that the present invention already has industrial applicability, and in addition, the technical features disclosed in the present embodiment are not disclosed in publications before filing and are not disclosed. The technical features listed in the embodiments of the present invention are not limited to the fact that they are not used, and not only have the fact of enhancing the effects as described above, but also the additional effects cannot be overlooked. The present invention is not disclosed in any of these publications and is not publicly used, and has the fact that the above-mentioned effects are promoted. Therefore, the present invention satisfies both novelty and inventive step as patent requirements. It is agreed that it will be filed by law and granted early through examination.

It is drawing of the ball screw of USP4357838. It is drawing of the ball screw of USP5664459. It is a perspective view provided with the reflux end plug of the present invention. It is a disassembled perspective view of the ball screw of this invention. It is a figure which shows the state of assembly | attachment implementation of the ball screw (without a screw) of this invention. It is a disassembled perspective view of the other implementation system of the nut in this invention. It is a perspective view which shows the state which combined the other implementation system of the nut in this invention.

Explanation of symbols

<Conventional technology>
DESCRIPTION OF SYMBOLS 10 Screw 11 Nut 111 Mounting groove 12 Reflux end plug 121 Open type reflux path 13 C-shaped hook ring 14 Reflux end plug 15 Nut 151 Fixing groove 152 Locking groove <the present invention>
20 Nut 21 Through-hole 22 Groove 23 Housing groove 24 Engagement groove 30 Return end plug 31 Return path 311 Guide plate 32 Elastic connection portion 33 Engagement mass 331 Inclined surface 332 Contact surface

Claims (5)

A ball screw including a nut having a reflux hole, a screw and a reflux end plug for engagement including a screw penetrating the nut and a reflux end plug;
The return end plug is formed with an elastic connection portion, and an engagement groove and an engagement lump are relatively manufactured on the nut and the elastic connection portion of the return end plug. A ball screw provided with an engagement reflux end plug, wherein the reflux end plug is fixed on a nut by being fitted in a groove.   The reflux end plug is provided with a coated reflux path, and a sheet-like guide plate is installed in a spiral groove that is in close contact with the nut of the coated reflux path. The ball screw provided with the reflux end plug for engagement according to claim 1, wherein the ball screw is guided and connected to the reflux hole. The spiral groove and the reflux hole portion corresponding to the end face of the nut are provided with a concave receiving groove, an engaging groove recessed in the receiving groove, and
The return end plug is further received and fitted in the concave receiving groove of the nut, and an elastic connection portion extending slightly protruding from the return end plug is installed, and an engagement lump at the end of the elastic connection portion is formed. The ball screw provided with the return end plug for engagement according to claim 1 or 2, wherein the engaging groove of the corresponding nut is provided with an inclined surface and a contact surface with respect to the inclined surface.   4. The ball screw provided with the reflux end plug for engagement according to claim 3, wherein the nut is provided with an engagement groove that is recessed on the outer side of the accommodation groove. A concave groove is formed in the spiral groove and the reflux hole corresponding to the end face of the nut, an engagement mass is provided on the accommodation groove side, an inclined surface is provided on one side of the engagement mass, and the inclined surface is further provided. A contact surface is provided,
The reflux end plug is further received and accommodated in the concave receiving groove of the nut, and the end plug is provided with an elastic connecting portion slightly extended, and an engaging groove is provided in the elastic connecting portion. The shape of each of the nuts is fitted into the engagement groove corresponding to the engagement mass of the nut, and the return end plug is axially positioned on the end surface of the nut. A ball screw provided with the reflux end plug for engagement according to 2.

Images