TWM472775U - Ball screw - Google Patents

Abstract

A ball screw includes a screw, a nut and a plurality of balls. The nut is slidably disposed on the screw. The nut includes a nut body and at least one end assembly. The nut body has a fabricating opening and a groove on at least one end part of the nut body. The groove extends from the fabricating opening to the inside of the nut body. The end assembly includes a positioning member and an end circulation member. The end circulation member is mounted the nut body and has a circulation part and a positioning hole. The circulation part and the positioning member are both held in the fabricating opening and the groove.

Description

Ball screw

This creation is about a ball screw.

The ball screw is a device widely used in many mechanical devices. The purpose of the ball screw is to provide a precise transmission function. In the mechanical operation, the rotary motion and the linear motion are used to carry the loaded machine or object in a straight line. Actuate.

With the development of technology, the higher the requirements on precision, the smaller the range of motion required by the machine, so as to achieve the purpose of micro-motion. In addition, some small machines also require a small-sized ball screw for smooth operation. For the above reasons, the demand for ball screws with small lead is also increasing.

However, if the ball screw of the small lead is too deep, the engagement of the end members may affect the operation of the ball passage, so that the balls cannot operate normally inside the nut.

In view of the above problems, the purpose of the present invention is to provide a ball screw that can be applied to a small lead.

To achieve the above object, a ball screw according to the present invention comprises a screw, a nut and a plurality of balls. The screw has at least one track groove. The nut is slid over the screw. The nut includes a nut body and at least one end assembly. The nut body has an assembly opening and an assembly groove at least at one end. The assembly slot self-assembling opening extends into the interior of the nut body. The inner side of the nut body has at least one inner ball groove corresponding to the track groove. The inner ball groove corresponds to the track groove, and forms an inner ball channel with the corresponding track groove. The nut body has a return passage corresponding to the inner ball passage, and the inner ball passage is a part of one of the ball circulation passages of the ball screw. The end assembly includes a positioning member and an end portion of the circulation member. The end circulation member is mounted on the end of the nut body and has a Loop department. The circulation portion and the positioning member are commonly accommodated in the assembly opening and the assembly groove. The balls are placed in the ball circulation passage.

In an embodiment, the end circulation member has a positioning hole, and the positioning member has a positioning member body and a positioning latch. The positioning body is received in the assembly slot, and the positioning clip is engaged with the positioning hole.

In an embodiment, the longitudinal direction of the positioning member is perpendicular to the long axis direction of the nut body.

In an embodiment, the positioning hole is a through hole or a blind hole.

In an embodiment, the circulation portion is further provided with a reinforcing member.

In an embodiment, the lead groove has a lead of less than 4 mm.

In an embodiment, the end assembly further includes a dust member. The dustproof member is mounted on the other side of the end circulation member with respect to the nut body.

In an embodiment, the end assembly further includes a securing member. The fixing member is mounted on the other side of the dustproof member with respect to the end circulation member.

In an embodiment, the positioning member is made of metal.

In summary, the ball screw according to the present invention has a novel structural design, and the end circulation member is fixed by the arrangement of the positioning member and the end portion of the end circulation member in the assembly opening and the assembly groove. The nut further makes the end circulation member less likely to sway or vibrate relative to the nut, thus not affecting the operation in the ball passage, and is applicable to the ball screw of the small guide track groove.

[study]

no

[this creation]

1‧‧‧ screw

11‧‧‧ Track slot

2‧‧‧ nuts

21‧‧‧ Nut body

211‧‧‧Assembly opening

212‧‧‧Inside ball groove

213‧‧‧ Return channel

214‧‧‧First annular receiving slot

215‧‧‧Second annular accommodating groove

216‧‧‧End opening

22‧‧‧End components

221‧‧‧End cycle parts

222‧‧‧Dust-proof parts

223‧‧‧Fixed parts

224‧‧ Circulation Department

225‧‧‧Returning corner

226‧‧‧Reinforcement

3‧‧‧ balls

A-A‧‧‧ Straight line

EP1‧‧‧ first end

EP2‧‧‧ second end

ES1‧‧‧ first end face

ES2‧‧‧ second end

G‧‧‧Assembly

H‧‧‧Position hole

IS‧‧‧ inner surface

OS‧‧‧ outer surface

P‧‧‧positioning parts

P1‧‧‧ positioning body

P2‧‧‧positioning card

PS‧‧‧Bumps

R‧‧‧inner ball channel

S‧‧‧Rolling screw

T‧‧‧ positioning groove

1 is a schematic view of a ball screw according to an embodiment of the present invention.

2 is an exploded perspective view of the ball screw shown in FIG. 1.

3 is a partial cross-sectional view of the ball screw shown in FIG. 1.

4 is a top view of the nut 2 .

5A and 5B are cross-sectional views of Fig. 4 taken along line A-A.

6A and 6B are schematic views of the end circulation member and the positioning member.

Hereinafter, a ball screw according to a preferred embodiment of the present invention will be described with reference to the related drawings, wherein the same elements will be described with the same reference numerals.

1 is a schematic view showing the appearance of a ball screw according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the ball screw shown in FIG. 1. Referring to FIG. 1 and FIG. 2 simultaneously, the ball screw S is composed of a plurality of components, and the components mainly include a screw 1, a nut 2, and a plurality of balls 3. The screw 1 is a cylindrical rod body, and its outer surface has a spiral track groove 11 continuously wound along the longitudinal axis (i.e., the long axis of the screw 1). The nut 2 is slidably disposed on the screw 1 , and the nut 2 includes a nut body 21 and at least one end assembly 22 . In this embodiment, the two sets of end assemblies 22 are taken as an example. The nut body 21 is substantially a hollow annular cylinder and can be sleeved on the screw 1. The nut body 21 has two end portions, which are respectively a first end portion EP1 and a second end portion EP2 of the nut body 21 along the two ends of the long axis. Moreover, at least one end portion has an assembly opening 211 and an assembly groove G for the end assembly 22 to be mounted. The assembly groove G self-assembling opening 211 extends toward the inside of the nut body 21, and the extending direction may be substantially perpendicular to the long axis direction of the nut body 21. In addition, the inner side of the nut body 21 has at least one inner ball groove 212 corresponding to the track groove 11. The structural features and components of the above-described ball screw S will be described below.

In the present embodiment, the nut body 21 is formed by processing a nut body (not shown). Specifically, the nut body material may be a block or column material of a metal material, and after being ground, the nut body 21 and its detailed structure are formed. Of course, the processing method of the nut body 21 is not limited. In practical applications, the nut body 21 can also be made by other methods such as casting, forging, and milling. The nut body 21 can be an annular cylinder and has an inner ball groove 212 formed on the inner side. Of course, in the actual manufacturing process, the flange hole, the oil hole, the return hole and the like may be added or drilled according to the use requirement, or even the surface heat treatment of the nut body may be used to strengthen the nut. The hardness of the body, this creation is not limited here.

3 is a partial cross-sectional view of the ball screw shown in FIG. 1, please refer to FIG. 2 and FIG. 3 at the same time. In the present embodiment, the ball screw S has a ball circulation passage. The track groove 11 is formed on the outer surface of the screw 1. The inner side of the nut body 21 has an inner ball groove 212. Corresponding to the track groove 11. The lead distance and the groove surface configuration of the inner ball groove 212 are the same as or similar to the track groove 11. When the nut 2 is sleeved to the screw 1, the inner ball groove 212 and the track groove 11 can correspond to each other to form an inner ball passage R. The nut body 21 has a return passage 213 corresponding to the inner ball passage R, and the inner ball passage R is a part of the ball circulation passage of the ball screw S, and provides a path for the ball 3 to circulate.

Referring also to Figures 2 and 3, in the present embodiment, the nut 2 has two sets of end assemblies 22 to enhance the functionality provided by the respective end assemblies 22. The end assembly 22 includes an end portion of the circulation member 221 and a positioning member P. Preferably, the end assembly 22 and the nut body 21 are assembled in a snap fit manner.

4 is a top view of the nut 2, and FIGS. 5A and 5B are cross-sectional views of FIG. 4 along a line A-A. Please refer to FIG. 4, FIG. 5A and FIG. 5B at the same time. The two end portions 221 are respectively mounted and engaged with the first end portion EP1 and the second end portion EP2 of the nut body 21. Still further, as shown in FIGS. 6A and 6B, it is a schematic view of the end circulation member 221 and the positioning member P. The positioning member P has a positioning member body P1 and a positioning cassette P2, and the end circulation member 221 has a circulation portion 224 and a positioning hole H. The positioning member P is disposed in the assembly opening 211 of the nut body 21 and the assembly groove G by the positioning member body P1 and the circulation portion 224, and is engaged with the positioning hole of the end circulation member 221 by the positioning clip P2. H. In this way, the positioning member P can fix the end circulation member 221 to the nut body 21. In this embodiment, the end portion 221 may further have a positioning groove T for receiving the positioning member P. Preferably, the positioning member body P1 is received in the positioning groove T, so that positioning can be performed. The piece P is less likely to be shaken or rotated with respect to the end portion. In addition, the positioning hole H may be a through hole or a blind hole, and the creation is not limited.

In addition, in the present embodiment, the extending direction of the assembly groove G can be substantially perpendicular to the long axis direction of the nut body 21, so that the positioning member P is housed in the assembly groove G in a direction perpendicular to the long axis of the nut body 21. The configuration in which the positioning member P and the end circulation member 221 are accommodated in the assembly groove G does not affect the operation in the ball passage, and therefore the embodiment can be applied to a ball screw having a small lead, such as the track groove 11. The lead can be less than 4mm.

In addition, the positioning member P and the end circulation member 221 may be a single member integrally formed, or a separate member, as long as it can be locked to the nut body 21, the present invention is not limited thereto. The material of the positioning member P may be metal or non-metal, and the creation is not limited.

Referring to FIGS. 2, 3, 6A, and 6B as well, the circulation portion 224 is housed in the assembly opening 211 and the assembly groove G. The circulation portion 224 further includes a recirculation curve 225 which communicates with the return passage 213 of the nut body 21 and the inner ball passage R to collectively form a ball circulation passage of the ball screw S.

Following the above, when viewed as a whole, the inner ball passage R and the return passage 213 complete the ball circulation path by the return curve 225, and the plurality of balls 3 are placed in the ball circulation path, and the balls 3 continue in the ball circulation path. Rolling causes the nut 2 to move relative to the screw 1.

In addition, in the present embodiment, when the ball 3 passes through the return curve 225, a strong impact force is generated on the return curve 225. Therefore, a reinforcement member 226 is provided in the return curve 225, which can be used for enhanced reflow. The strength of the curve, but the material of the reinforcing member 226 is not limited by the creation, it may be stainless steel with high impact resistance, or other metal materials.

2 and 3, the first end portion EP1 and the second end portion EP2 have a first end surface ES1 and a second end surface ES2, respectively. The assembly opening 211 extends from the first end surface ES1 of the nut body 21 toward the second end surface ES2, and the assembly opening 211 also penetrates the outer surface OS and the inner surface IS of the nut body 21, thereby being relative to the nut body. 21 presents an "open" gap form. Therefore, in the process, the embodiment only needs to be through the lathe milling method, especially the CNC turning and milling method, and the open operation mode can be adopted. On the nut body 21, for example, from the first end face ES1 or from the outer surface OS, the former is directed to the second end face ES2, and the latter is directed to the inner surface IS to directly cut the block of a predetermined size to form the assembly opening 211. In practical applications, the assembly opening 211 can also be formed by turning or cutting. In addition, the nut body 21 defines that the side wall of the assembly opening 211 can be further processed by grinding and/or polishing, and the remaining burrs after the rough molding are removed, which helps to reduce the tolerance, and the present invention is not limited thereto. Further, other operational portions not described above should be understood by those having ordinary skill in the art to which the present invention pertains, and will not be described herein.

It is worth mentioning that the assembly opening 211 and the assembly groove G can be made by open machining and open through the inner and outer openings. Therefore, when the quality control is implemented, the detection is easy and the measurement tool is simplified. When applied, two-dimensional inspection can be used to ensure the accuracy of the product. Compared with the prior art, there is the advantage of shortening the process or quality control time and reducing the cost. Overall, the nut body 21 of the present invention and its assembly opening 211 and group are compared with the prior art. Because of the special design of the structure, the groove G can be formed by the open processing method, which not only greatly reduces the difficulty and time consuming of the small structure processing, but also helps to improve the precision of the assembly opening 211.

As shown in FIG. 3, the dustproof member 222 is disposed on the other side of the end portion circulating member 221 with respect to the nut body 21. The fixing member 223 is attached to the other side of the dustproof member 222 with respect to the end portion circulating member 221. Preferably, as shown in FIG. 5A, one end of the nut body 21, such as the first end portion EP1, has a first annular receiving groove 214, a second annular receiving groove 215 and one end from the inside to the outside. Opening 216. The first annular receiving groove 214 and the second annular receiving groove 215 are formed on the inner side of the nut body 21, and the end opening 216 is defined by the inner protruding block PS of the nut body 21. Similarly, as shown in FIG. 5B, the second end portion EP2 also has the first annular receiving groove 214, a second annular receiving groove 215, and an opening 216, and the structure thereof is as described above, and therefore will not be described again.

As shown in FIG. 2 to FIG. 5B , the end portion 221 is received in the first annular receiving groove 214 , and the dust member 222 and the fixing member 223 are received in the second annular receiving groove 215 . In the present embodiment, the material of the dust-proof member 222 is a soft material, that is, the dust-proof member 222 can absorb the tolerances during assembly by the characteristics of the soft material, and provides dustproof and/or oil-sealing effects.

In the above, the fixing member 223 is located at the outermost side with respect to the nut body 21, but is also accommodated in the second annular receiving groove 215. The fixing member 223 is preferably a C-shaped structure. When assembled, the fixing member 223 can be subjected to an external force to be pressed first, so that after the volume is reduced, as shown in FIG. 1 or FIG. 4B, the end opening 216 can be passed through and then set. The second annular receiving groove 215. Thereafter, by releasing the elastic force or deformation ability of the fixing member 223 itself, the fixing member 223 can be expanded and abutted against the second annular receiving groove 215, thereby fixing the end assembly 22 in the direction along the long axis of the screw 1. And avoid the problem of longitudinal displacement of the end assembly 22.

According to the above, since the nut body 21 has the assembly opening 211 to be assembled with the end assembly 22, and the end assembly 22 has the fixing member 223, the assembly of the end assembly 22 and the nut body 21 can be achieved without screw locking. It can prevent the effect of displacement. Of course, in other embodiments, if the ball screw is a small or micro ball screw or a screw without a screw locking space, the above structure can exert a very good effect.

In summary, the ball screw according to the present design, through the novel structural design, is accommodated in the assembly opening and the assembly groove by the circulation part of the positioning piece and the end circulation part. The end circulation member is fixed to the nut, so that the end circulation member is not easy to shake or vibrate with respect to the nut, so that the operation in the ball passage is not affected, and the ball screw of the small guide track groove can be applied.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of this creation shall be included in the scope of the appended patent application.

1‧‧‧ screw

11‧‧‧ Track slot

21‧‧‧ Nut body

211‧‧‧Assembly opening

212‧‧‧Inside ball groove

22‧‧‧End components

221‧‧‧End cycle parts

222‧‧‧Dust-proof parts

223‧‧‧Fixed parts

224‧‧ Circulation Department

225‧‧‧Returning corner

226‧‧‧Reinforcement

3‧‧‧ balls

EP1‧‧‧ first end

EP2‧‧‧ second end

ES1‧‧‧ first end face

ES2‧‧‧ second end

G‧‧‧Assembly

H‧‧‧Position hole

IS‧‧‧ inner surface

OS‧‧‧ outer surface

P‧‧‧positioning parts

P1‧‧‧ positioning body

P2‧‧‧positioning card

S‧‧‧Rolling screw

Claims (9)

A ball screw comprising: a screw having at least one track groove; a nut slidingly disposed on the screw, the nut comprising: a nut body having an assembly opening at least at one end and an assembly groove, An assembly slot extends from the assembly opening to the interior of the nut body, the inner side of the nut body having at least one inner ball groove corresponding to the track groove, the inner ball groove corresponding to the track groove, and corresponding to the track groove An inner ball passage having a return passage corresponding to the inner ball passage, wherein the inner ball passage is a part of a ball circulation passage of the ball screw; and at least one end assembly comprising: a positioning member; One end of the circulation member is mounted on the end of the nut body, and has a circulation portion, the circulation portion and the positioning member are commonly accommodated in the assembly opening and the assembly groove; and a plurality of balls are accommodated The ball circulation channel. The ball screw of the first aspect of the invention, wherein the end of the circulation member further has a positioning hole, the positioning member has a positioning member body and a positioning card, the positioning member body is received in the assembly groove, And the positioning card is engaged with the positioning hole. The ball screw of claim 2, wherein the longitudinal direction of the positioning member is perpendicular to a longitudinal direction of the nut body. The ball screw of claim 2, wherein the positioning hole is a through hole or a blind hole. The ball screw of claim 1, wherein the circulation portion is further provided with a reinforcing member. The ball screw of claim 1, wherein the track groove has a lead of less than 4 mm. The ball screw of claim 1, wherein the end assembly further comprises a dustproof member mounted on the other side of the end circulation member relative to the nut body. The ball screw of claim 7, wherein the end assembly further comprises a fixing member mounted on the other side of the dust-proof member relative to the end-cycle member. The ball screw of claim 1, wherein the positioning member is made of metal.