TWM540208U - End stop for ball screw - Google Patents

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 reflow element disclosed in the Patent No. I296682 of the Republic of China is assembled from the end plug and the separating member, and the end plug is provided with a main return path at the position of the return hole of the corresponding nut. And a filling hole is extended outwardly from the main return path, and the separating member is disposed in the filling hole of the end plug by the plug rod, and the separating member has an auxiliary return path to form a connection with the main return path of the plug. In turn, the balls are guided into and out of the return holes. However, in this conventional patent case, the port of the plug of the separating member is C-shaped, which is easily deformed during the manufacturing process, so that the plug of the separating member is prone to misalignment or over-tightening when assembled in the filling hole of the plug. The condition of the ball will affect the smooth operation of the ball. In order to solve the assembly problem, the current practice is to use special tools to increase the filling hole of the end plug, but this will inevitably increase the manufacturing cost.

The main purpose of the present invention is to provide an end plug for a ball screw which can improve assembly efficiency and assembly accuracy.

In order to achieve the above object, the end plug of the present invention includes a first reflow member and a second reflow member. The first reflowing member has a first reflow portion, a ring-shaped abutting portion and a first connecting portion. The first reflow portion has a first reflowing groove, and the opposite ends of the first connecting portion are respectively connected to the first reflowing portion. And the annular abutting portion, the first connecting portion has an arc shape; the second reflowing member has a second reflow portion, the second reflow portion has a second reflow groove, and the second recirculation groove corresponds to a first returning groove of the first returning member, such that a return channel is formed between the first and second returning grooves, one end of the returning channel is connected to a load path, and further, the second returning member has a first a second connecting portion having an arc shape, the second connecting portion abutting the first connecting portion of the first reflow member, and one end of the second connecting portion is connected to the second reflow portion, The other end of the second connecting portion abuts against the annular abutting portion of the first reflow member, such that the annular abutting portion of the first reflow member, the first engaging portion of the first reflow member, and the second retracting member are second Forming a connecting channel together between the connecting portions, the connecting One end of the channel communicates with the other end of the return channel, the other end of the adapter communicates with a passage of the nut one circulation passage.

More preferably, the first reflow member further has a first engaging portion disposed on the first reflow portion, and the second reflow member further has a second engaging portion disposed on the second reflow portion. 1. The second reflow members are assembled by the engagement of the first and second engaging portions.

More preferably, the first reflow portion of the first reflow member has a positioning protrusion, and the second reflow portion of the second reflow member has a positioning groove, and the first reflow portion of the first reflow member and the first reflow portion The positioning between the second reflow portion of the two reflow members is achieved by the embedding between the positioning protrusion and the positioning groove after assembly.

More preferably, the first reflow member further has a guiding protrusion disposed on the first reflow portion and corresponding to the return passage for providing a guiding reflow effect to each of the balls.

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.

Please refer to Figures 1 and 2 first. The ball screw 10 shown in the figure comprises a screw 20, a nut 30 and a plurality of balls 40. The screw 20 has a rolling groove 21 formed around the outer peripheral wall, and the nut 30 is sleeved. It is disposed on the screw 20 and has an inner circulation passage 31 and a rolling groove 32 formed around the inner peripheral wall. The rolling groove 32 of the nut 30 and the rolling groove 21 of the screw 20 cooperate to form a ball 40 for running. The load path 12 (as shown in FIG. 5), in addition, the two ends of the nut 30 further have a mounting groove 33.

Referring to Figures 3 and 4, the number of end plugs 50 of the present invention is two when the ball screw 20 is used, and the two end plugs 50 are respectively disposed in the mounting grooves 33 at both ends of the nut 30. The end plug 50 of the present invention includes a first reflow member 60 and a second reflow member 70.

The first reflow member 60 has a first reflow portion 61, an annular abutment portion 62 and a first engagement portion 63. The first reflow portion 61 has a first reflow groove 64 away from the side surface of the nut 30. The first reflow portion 61 is respectively provided with a guiding protrusion 65 and a positioning protrusion 66 on opposite sides of the first reflow groove 64. The port of the annular abutting portion 62 is annular, and can form a stable alignment with the port of the inner circulation channel 31 of the nut 30; the cross-sectional shape of the first connecting portion 63 is curved, and one end of the first connecting portion 63 is connected. A reflow portion 61 is opposite to one side of the first reflow groove 64, and the other end of the first engaging portion 63 is connected to one half of the annular abutment portion 62. In addition, the first reflow member 60 further has a first engaging portion 67, and the first engaging portion 67 is connected between the first reflow portion 61 and the first engaging portion 63.

The second reflow member 70 has a second reflow portion 71 , a second engagement portion 72 , and a second engagement portion 73 . The second reflow portion 71 has a second reflow groove 74 facing one side of the nut 30, and the second reflow portion 71 is provided with a positioning groove 75 on one side of the second reflow groove 74; the cross-sectional shape of the second engagement portion 72 In an arc shape, one end of the second engaging portion 72 is connected to the second reflow portion 71 toward one side of the nut 30; the second engaging portion 73 is connected between the second reflow portion 71 and the second engaging portion 72.

As can be seen from the above, the first and second reflow members 60, 70 are assembled by the engagement between the first and second engaging portions 67, 73, and the positioning projections 66 and the positioning grooves 75 are utilized. Inter-engagement to complete positioning. After the assembly is completed, the first and second recirculation grooves 64, 74 are abutted to each other to form a return passage 52, and the return passage 52 corresponds to the guide protrusion 65 of the first reflow member 60, and one end of the return passage 52 The first connecting portion 72 of the second reflow member 70 is connected to the first connecting portion 63 of the first reflow member 60, and the second reflow member 70 is connected to the load path 12 (as shown in FIG. 5). The end of the second engaging portion 72 abuts against the other half of the annular abutting portion 62 of the first reflow member 60, such that the annular abutting portion 62 of the first reflow member 60 and the first engaging portion 63 of the first reflow member 60 And the second connecting portion 72 of the second reflowing member 70 forms an engaging passage 54. One end of the engaging passage 54 communicates with the other end of the return passage 52, and the other end of the engaging passage 54 communicates with the inner circulating passage of the nut 30. 31 (as shown in Figure 6). Thereby, the balls 40 located in the load path 12 can enter the return passage 52 from the inner circulation passage 31 of the nut 30 via the engagement passage 54, and then guided from the return passage 52 by the guide protrusion 65. It returns to the load path 12 to achieve the guiding reflow effect.

It is worth mentioning that the screw 20 used in this embodiment is a toothed design (ie, the rolling groove 21 extends to both ends), however, the end plug 50 of the present invention can also be applied to a screw without teething ( That is, the rolling groove does not extend to the two ends, so that the cost reduction effect is achieved.

It can be seen from the above that the end plug 10 of the present invention utilizes the structural design of the annular abutting portion 62 and the matching between the first and second engaging portions 63, 72, on the one hand, can effectively prevent the end plug 50 itself from being deformed during the manufacturing process. On the other hand, the end plug 50 itself can be assembled more easily and easily with the nut 30, so that special tools can be avoided in the assembly process, thereby achieving the purpose of improving assembly efficiency, improving assembly precision, and reducing manufacturing cost.

10‧‧‧Rolling screw
12‧‧‧Load path
20‧‧‧ screw
21‧‧‧ rolling groove
30‧‧‧ Nuts
31‧‧‧Inner circulation channel
32‧‧‧ rolling trough
33‧‧‧Installation slot
40‧‧‧ balls
50‧‧‧End plug
52‧‧‧Reflux channel
54‧‧‧Connected channel
60‧‧‧First reflow
61‧‧‧First Reflow Department
62‧‧‧Rounded butt joints
63‧‧‧ First Connection
64‧‧‧First reflow tank
65‧‧‧Guided convex
66‧‧‧Positioning bumps
67‧‧‧First engagement department
70‧‧‧Second reflow
71‧‧‧Second reflow
72‧‧‧Second Linkage
73‧‧‧Second engagement department
74‧‧‧Second reflow tank
75‧‧‧ positioning groove

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. Figure 3 is a three-dimensional combination of the end plugs of the creation. Figure 4 is an exploded perspective view of the end plug of the present invention. Figure 5 is a cross-sectional view of the ball screw of the end plug of the present application, mainly showing the relationship between the return passage and the load path. Fig. 6 is another cross-sectional view of the ball screw to which the end plug of the present invention is applied, mainly showing the relationship between the engagement channel and the inner circulation passage.

60‧‧‧First reflow

61‧‧‧First Reflow Department

62‧‧‧Rounded butt joints

63‧‧‧ First Connection

64‧‧‧First reflow tank

65‧‧‧Guided convex

66‧‧‧Positioning bumps

67‧‧‧First engagement department

70‧‧‧Second reflow

71‧‧‧Second reflow

72‧‧‧Second Linkage

73‧‧‧Second engagement department

74‧‧‧Second reflow tank

75‧‧‧ positioning groove

Claims (4)

An end plug for a ball screw, the ball screw comprising a screw and a nut, the screw has a rolling groove, the nut is sleeved on the screw and has an inner circulation passage and a rolling groove, and the rolling groove The rolling groove cooperates with each other to form a load path, and the end plug is disposed in the nut and includes: a first reflow member having a first reflow portion, an annular abutting portion and a first connecting portion, the first The first reflow portion has a first reflow portion, and the opposite ends of the first connecting portion are respectively connected to the first reflow portion and the annular abutting portion, the cross-sectional shape of the first connecting portion is curved; and a second reflow a second reflow portion having a second reflow portion corresponding to the first reflow tank of the first reflow member and the first reflow portion Forming a return channel between the first returning grooves, one end of the returning channel is connected to the load path, the second connecting portion has an arc shape, and the second connecting portion is abutted against the first returning member. First connecting portion, the second connecting portion One end of the second reflow portion is connected to the annular reciprocating portion of the first reflow member, such that the annular abutting portion of the first reflow member and the first connecting portion of the first reflow member And forming a connecting channel between the second connecting portion of the second returning member, one end of the connecting channel is connected to the other end of the return channel, and the other end of the connecting channel is connected to the inner circulation channel of the nut. The end plug for a ball screw according to claim 1, wherein the first reflow member further has a first engaging portion disposed on the first reflow portion, and the second reflow member has a further one. The second engaging portion of the two reflow portions is detachably coupled to each other between the first and second engaging portions. The end plug for a ball screw according to claim 1, wherein the first reflow portion of the first reflow member has a positioning protrusion, and the second reflow portion of the second reflow member has a positioning groove, the positioning The bump is detachably embedded with the positioning groove. The end plug for a ball screw according to claim 1, wherein the first reflow member further has a guiding protrusion disposed at the first reflow portion and corresponding to the return passage.