TWM567822U - End stop for ball screw - Google Patents

Abstract

The present invention relates to an end plug for a ball screw that includes a first reflow member and a second reflow member. The first reflow member has a first engaging portion, and the second reflow member has a second engaging portion and an engaging groove provided in the second engaging portion, and the first and second reflow members utilize the first engaging portion It is assembled with the engagement between the engaging grooves of the second engaging portion, wherein the length of the engaging groove is defined as L, and the height of the engaging groove is defined as H, and the following relationship is satisfied between the two: . Thereby, the end plug of the present invention can reduce the assembly interference amount of the first and second reflow members and increase the assembly speed of the first and second reflow members.

Description

End plug for ball screw

This creation relates to a ball screw, and in particular to an end plug for a ball screw.

The ball screw mainly achieves high-precision linear transmission effect by rolling the steel ball between the screw and the nut. In order to allow the steel ball to continuously circulate and roll, the ball screw is structurally matched with the circulation path of the steel ball to provide an end plug as a reflow element in the nut.

In the related art, the end plug disclosed in the Patent Publication No. M540208 includes a first reflow member and a second reflow member, and the first and second reflow members are utilized between the first and second reflow members. The engaging portions are assembled and assembled, and the positioning is achieved by the engagement between the positioning protrusions and the positioning grooves. In the foregoing patent, the first engaging portion of the first reflow member and the second engaging portion of the second reflow member must have sufficient and matching lengths to ensure that the two are not easily loosened after being engaged with each other, but After the second reflow member is manufactured by injection molding, the second engaging portion is liable to cause a downward tilting phenomenon at the end due to the relationship of its own length being too long, which will cause interference between the first and second engaging portions. The amount is too large to be assembled, and may cause structural damage even in severe cases.

The main purpose of the present invention is to provide an end plug for a ball screw which can avoid structural deformation after the completion of manufacture, thereby reducing the amount of assembly interference and increasing the assembly speed.

In order to achieve the above main object, the end plug of the present invention comprises a first reflow member and a second reflow member. The first reflow member has a first reflow portion and a first engaging portion, the first reflow portion has a first reflow groove, the first engaging portion integrally connects the first reflow portion; the second reflow portion The second reflow portion is detachably disposed at the first reflow portion of the first reflow member and has a second reflow tank, and the second reflow member a second reflow groove of the second reflow portion corresponding to the first reflow groove of the first reflow portion of the first reflow member, so that a return channel is formed between the two reflow portions, and the second engagement portion integrally connects the second reflow portion and Forming an engaging groove with the second reflowing portion, the engaging groove of the second reflowing member is detachably engaged with the first engaging portion of the first reflowing member, wherein the length of the engaging groove is defined For L, the height of the engagement slot is defined as H, and the following relationship is satisfied between the two: .

Therefore, the engagement groove designed by the end plug of the present invention can avoid the structural collapse of the second reflow member after the completion of the manufacturing, so that the interference amount of the first and second reflow members during assembly can be Maintain it to an appropriate level to speed up the assembly process and avoid structural damage.

More preferably, the second engaging portion has a side wall, an end wall and an engaging wall, and the side wall integrally connects the second returning portion with the end wall, the engaging wall integrally connecting the side wall and the end wall And abutting with the first engaging portion of the first reflow member. Thereby, the engaging groove is surrounded by the side wall, the end wall and the engaging wall, and further, the length of the engaging groove is equal to the shortest between the free end of the engaging wall and the end wall. The distance of the engaging groove is equal to the shortest distance between the engaging wall and the second returning portion.

More preferably, the engaging wall has a first side opposite to the engaging groove and a second side facing away from the engaging groove, and the shortest distance between the first and second sides is equal to the engaging groove The height. Thereby, proper assembly tightness is maintained between the first and second reflow members.

More preferably, the first reflow member further has a stop portion integrally connected to the first reflow portion and adjacent to the first engaging portion, and the second retracting member is second engaged. The engaging wall of the portion abuts against the stop of the first returning member.

The detailed construction, features, assembly or use of the end plugs provided by this creation will be described in the detailed description of the subsequent embodiments. However, those of ordinary skill in the art should understand that the detailed description and specific embodiments of the present invention are merely used to illustrate the present invention and are not intended to limit the scope of the patent application.

The Applicant first describes the same or similar elements or structural features thereof in the embodiments and the drawings which will be described below.

Please refer to Figures 1 and 2 first. The ball screw 10 shown in the figure comprises a screw 12, a nut 14 and a plurality of balls 18, wherein the nut 14 has a mounting groove 16 at each end. The number of end plugs 20 when used in conjunction with the aforementioned ball screw 10 is two and is disposed in a one-to-one manner in the mounting groove 16 of the nut 14.

Referring again to Figures 3 through 5 and 7, the end plug 20 of the present invention includes a first return member 30 and a second return member 40.

The first reflow member 30 has a first reflow portion 31. The first reflow portion 31 has a first reflow groove 32 extending in an arc shape, and the first reflow portion 31 is respectively disposed on opposite sides of the first reflow groove 32. There is a guiding protrusion 33 and a positioning protrusion 34. In addition, the first reflow member 30 further has a first engaging portion 35 and a stopping portion 36. The first engaging portion 35 is integrally connected to the first reflow portion 31 and located at a turning point of the first recirculation groove 32. The stopper portion 36 is integrally connected between the first reflow portion 31 and the first engagement portion 35.

The second reflow member 40 has a second reflow portion 41 having a second recirculation groove 42 extending in an arc shape, and the second reflow portion 41 is provided on one side of the second recirculation groove 42. The groove 43 is positioned. In addition, the second reflow member 40 further has a second engaging portion 44. The second engaging portion 44 integrally connects the second reflow portion 41 and forms an engaging groove 48 with the second reflow portion 41, more specifically The second engaging portion 44 has a side wall 45, an end wall 46 and an engaging wall 47. The side wall 45 and the end wall 46 are integrally connected to the second return portion 41, and the engaging wall 47 is integrally connected to the side wall 45. Between the end wall 46 and the end wall 46, the engaging groove 48 is surrounded between the side wall 45, the end wall 46 and the engaging wall 47. Further, as shown in FIG. 7, the engaging wall 47 has a facing engaging groove 48. The shortest distance D between the first side 472 and the second side 474 facing away from the engaging groove 48, the first and second sides 472, 474 (that is, the height of the engaging wall 47) is equal to the height of the engaging groove 48. H.

As can be seen from the above, as shown in FIGS. 3 to 6, the first and second reflow members 30 and 40 are engaged by the engagement between the first engagement portion 35 and the engagement groove 48 of the second engagement portion 44. Assembled together, and the positioning is completed by the engagement between the positioning protrusion 34 and the positioning groove 43, and the stop portion 36 of the first reflow member 30 abuts against the second engagement of the second reflow member 40. The engaging wall 47 of the portion 44 is such that after the assembly is completed, the first and second return grooves 32, 42 can abut each other to form a return passage 49.

In order to have the first and second reflow members 30, 40 have appropriate tightness after assembly, the engagement groove 48 is specially designed in size, and more specifically, as shown in Fig. 7, the engagement groove 48 The length is equal to the shortest distance between the free end of one of the engaging walls 47 and the end wall 46. In the present embodiment, it is defined as L, and the height of the engaging groove 48 is equal to between the engaging wall 47 and the second returning portion 41. The shortest distance is defined as H in this embodiment, and the following relationship is satisfied between the two: . If If the value is less than 1.5, the amount of interference between the first engaging portion 35 and the engaging groove 48 is insufficient. Since the first and second returning members 30 and 40 need to be assembled before the manufacturing is completed, the shaping effect is achieved, if there is insufficient interference. The problem will cause the two to be easily separated during the transportation process, which will cause troubles in subsequent assembly; If it is larger than 4.5, it means that the amount of interference between the first engaging portion 35 and the engaging groove 48 is too large, and it is also difficult to assemble when assembled to the nut 14 like the conventional technique. Therefore, the amount of interference between the first engaging portion 35 and the engaging groove 48 can be maintained at an appropriate level by the above relational expression.

In summary, the end plug 10 of the present invention utilizes the engaging groove 48 designed by the above relationship to prevent the second reflow member 40 from collapsing after the manufacturing is completed, so that the first and second reflow members 30, 40 are Proper interference can be maintained during assembly to speed up the assembly process and avoid structural damage.

10‧‧‧Rolling screw

12‧‧‧ screw

14‧‧‧ Nuts

16‧‧‧Installation slot

18‧‧‧ balls

20‧‧‧End plug

30‧‧‧First reflow

31‧‧‧First Reflow Department

32‧‧‧First reflow tank

33‧‧‧Guided convex

34‧‧‧Positioning lugs

35‧‧‧First engagement department

36‧‧‧stop

40‧‧‧Second reflow

41‧‧‧Second reflow department

42‧‧‧Second reflow tank

43‧‧‧ positioning groove

44‧‧‧Second engagement department

45‧‧‧ side wall

46‧‧‧End wall

47‧‧‧Card wall

472‧‧‧ first side

474‧‧‧ second side

D‧‧‧Distance

48‧‧‧ snap groove

49‧‧‧Return channel

L‧‧‧ length

H‧‧‧ Height

Fig. 1 is a perspective view showing the appearance of a ball screw to which the end plug of the present invention is applied. Fig. 2 is an exploded perspective view of the ball screw to which the end plug of the present invention is applied. Fig. 3 is a perspective view showing the appearance of the end plug of the present invention. Figure 4 is an exploded perspective view of the end plug of the present invention. Figure 5 is an exploded perspective view of the end of the creation in another perspective. Figure 6 is a front view of the end plug of the creation. Figure 7 is a cross-sectional view taken along line 7-7 of Figure 6.

Claims (5)

An end plug for a ball screw, comprising: a first reflow member having a first reflow portion and a first engaging portion, the first reflow portion having a first recirculation groove, the first engaging portion Integrally connecting the first reflow portion; and a second reflow member having a second reflow portion and a second engagement portion, the second reflow portion being detachably disposed at the first reflow portion of the first reflow member And having a second reflow tank corresponding to the first recirculation groove of the first reflow portion of the first reflow member so as to form a return channel therebetween, the second engaging portion integrally connecting the first reflow portion An engaging groove is formed between the second reflow portion and the second reflow portion, and the engaging groove is detachably engaged with the first engaging portion of the first reflow member, and the length of the engaging groove is defined as L. The height of the engagement groove is defined as H, and the following relationship is satisfied between the two: . The end plug for a ball screw according to claim 1, wherein the second engaging portion has a side wall, an end wall and an engaging wall, the side wall integrally connecting the second return portion with the end wall, The engaging wall is integrally connected between the side wall and the end wall and abuts against the first engaging portion of the first reflow member, and the engaging groove is surrounded by the side wall, the end wall and the engaging wall. The end plug for a ball screw according to claim 2, wherein the length of the engaging groove is equal to the shortest distance between the free end of one of the engaging walls and the end wall, and the height of the engaging groove is equal to the card The shortest distance between the wall and the second reflow portion. The end plug for a ball screw according to claim 2 or 3, wherein the engaging wall has a first side opposite to the engaging groove and a second side facing away from the engaging groove, the first The shortest distance between the second sides is equal to the height of the engaging groove. The end plug for a ball screw according to claim 2, wherein the first returning member further has a stopping portion integrally connecting the first returning portion and the first engaging portion, the first The engaging wall of the second engaging portion of the two reflow members abuts against the stopping portion of the first reflow member.