TWM608102U - Ball screw - Google Patents

Abstract

A ball screw includes a nut, a screw shaft, two circulating parts and a plurality of balls. The nut is formed with an inner spiral groove, two positioning holes and a middle return hole. The screw shaft passes through the nut and forms an outer spiral groove communicating with the inner spiral groove, and a part of the outer spiral groove and a part of the inner spiral groove jointly form a circulation channel. The circulating members are arranged in the opposite direction along the axial direction of the nut, each circulating member penetrates the corresponding positioning hole and is locked in the inner spiral groove, and each circulating member is formed with a connection to the inner spiral groove. An end return hole between one end of the middle return hole and one end of the circulation channel. The balls are contained in the circulation channel, the end return holes and the middle return holes. Thereby, each of the circulating parts can be firmly fixed in the nut.

Description

Ball screw

The new model relates to a ball screw, in particular to a ball screw with circulating parts.

The ball screw is matched with the nut, screw shaft and circulating parts through the recirculating ball to reduce the friction between the nut and the screw shaft to obtain a smooth linear transmission effect.

When the existing side-mounted circulating part is to be assembled to the nut, the circulating part is usually first installed in the slot of the nut, and then the circulating part is inserted through the screw and screwed into the screw hole of the nut. To lock the circulating parts on the nut. However, the aforementioned method of screw locking increases the number of components of the ball screw, resulting in higher overall manufacturing costs and more complicated and inconvenient assembly processes.

Therefore, one of the objectives of the present invention is to provide a ball screw that can overcome at least one of the disadvantages of the prior art.

Therefore, the new ball screw includes a nut, a screw shaft, two circulating parts, and a plurality of balls.

The nut is formed with an inner spiral groove, two positioning holes spaced apart and connected to the inner spiral groove, and a middle return hole between the positioning holes, and the positioning holes are along an axial direction of the nut Arranged at intervals. The screw shaft passes through the nut and forms an outer spiral groove communicating with the inner spiral groove, and a part of the outer spiral groove and a part of the inner spiral groove jointly form a circulation channel. The circulating members are arranged in the opposite direction along the axial direction of the nut, each circulating member penetrates the corresponding positioning hole and is locked in the inner spiral groove, and each circulating member is formed with a connection to the inner spiral groove. An end return hole between one end of the middle return hole and one end of the circulation channel. The balls are contained in the circulation channel, the end return holes and the middle return holes.

In the ball screw of the present invention, each of the circulating parts includes a positioning column penetrating the corresponding positioning hole, and a side locking column that is locked to the inner spiral groove, and the positioning column defines the end return hole .

In the ball screw of the present invention, the positioning column has an outer circumferential surface and an inner end surface connected to the inner end of the outer circumferential surface. The side latching column is protruding from the outer circumferential surface and partially protrudes from the inner end surface to be embedded in the outer spiral groove槽内。 In the slot.

In the ball screw of the present invention, the side latching column is integrally projected on the positioning column and forms a continuous structure with the positioning column, so that each of the circulating parts is a single independent component.

In the ball screw of the present invention, each of the circulating parts includes a positioning column penetrating through the corresponding positioning hole, and a side latching column protruding from one side of the positioning column, and the positioning column defines the end return hole , The side locking pin is locked in the inner spiral groove and partially embedded in the outer spiral groove.

In the ball screw of the present invention, each positioning hole is a circular hole, and the positioning column and the side latching column of each circulating member are each a circular column.

The effect of the present invention is that each of the circulating parts is inserted into the corresponding positioning hole through the positioning pillars, and the side latching pillars are locked in the inner spiral groove, so that the circulating parts can be firmly fixed Inside the nut. Since each of the circulating parts and the nut can be firmly fixed together without additional locking members such as screws, the number of components of the ball screw can be reduced, so as to improve the convenience of assembly and reduce the overall manufacturing cost.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are represented by the same numbers.

Referring to FIGS. 1 and 2, it is an embodiment of the new ball screw 100. The ball screw 100 includes a nut 1, a screw shaft 2, two circulating parts 3, and a plurality of balls 4.

2 and 3, the nut 1 includes an inner circumferential surface 11, an outer circumferential surface 12, and two end surfaces 13,14. The inner peripheral surface 11 defines a through hole 15 for the screw shaft 2 to pass through, and the through hole 15 extends along an axial direction A of the nut 1. The outer circumferential surface 12 is opposite to the inner circumferential surface 11. The end surfaces 13 and 14 are spaced apart along the axial direction A, and the through hole 15 is located between the end surfaces 13 and 14. The inner circumferential surface 11 of the nut 1 is recessed toward the outer circumferential surface 12 to form an inner spiral groove 16, and the inner spiral groove 16 is interposed between the end surfaces 13 and 14 and communicates with the through hole 15. The nut 1 is formed with two positioning holes 17 and a middle return hole 18. The positioning holes 17 are arranged at intervals along the axial direction A of the nut 1 and each extend between the inner peripheral surface 11 and the outer peripheral surface 12, and the positioning holes 17 communicate with the inner spiral groove 16. In this embodiment, each positioning hole 17 is a circular hole. The middle return hole 18 is located between the positioning holes 17, and the middle return hole 18 extends along the axial direction A of the nut 1.

The screw shaft 2 is used to pass through the through hole 15 of the nut 1, and the screw shaft 2 is formed with an outer spiral groove 21 that can communicate with the inner spiral groove 16. A part of the outer spiral groove 21 and a part of the inner spiral groove 16 can form a circulation channel P together.

Referring to FIGS. 3, 4 and 5, the circulating members 3 are arranged in the opposite direction along the axial direction A of the nut 1, and each circulating member 3 includes a positioning column 31 and a locking column 32 on one side. In this embodiment, each of the circulating members 3 is made of, for example, metal in an integral molding manner, and the side latching column 32 is integrally protruding from one side of the positioning column 31 and forms a continuous structure with the positioning column 31. So that each of the circulating parts 3 is a single independent component. Thereby, the manufacturing cost of each circulation member 3 can be reduced. The positioning column 31 is a circular column for passing through the corresponding positioning hole 17. The positioning column 31 has an outer peripheral surface 311 and an inner end surface 312 connected to the inner end of the outer peripheral surface 311. The positioning post 31 defines an end return hole 313. The end return hole 313 extends from one side of the outer peripheral surface 311 to the other side of the outer peripheral surface 311 and the inner end surface 312, and the end return hole 313 has an end return hole 313 located on the outer peripheral surface. A first opening 314 on one side of 311 and a second opening 315 on the other side of the outer peripheral surface 311 are separated from the second opening 315 by about 90 degrees. The first opening 314 and the second opening 315 of the end return hole 313 are respectively used to communicate one end of the middle return hole 18 and one end of the circulation channel P. The side latching post 32 is a circular post protruding from the outer peripheral surface 311 opposite to the second opening 315 and partially protruding from the inner end surface 312. The side latching post 32 is used for latching on the inner end surface 312. The spiral groove 16 can be embedded in the outer spiral groove 21.

Referring to Figures 3, 5 and 6, the balls 4 are used to be arranged in the circulation channel P, the end return holes 313 and the middle return hole 18, and can be arranged in the circulation channel P, the end return holes 313 and the middle return hole 18 together constitute a loop Circulate in the path.

Referring to Figures 2, 3 and 5, when the screw shaft 2, the circulating parts 3 and the balls 4 are to be assembled on the nut 1, first, a part of the screw shaft 2 is passed through the end surface 13 side It is arranged in the through hole 15 of the nut 1 so that the screw shaft 2 does not cover the corresponding positioning hole 17 adjacent to the end surface 13. Subsequently, one of the circulating members 3 is inserted into the through hole 15 through the end surface 14 side, so that the positioning post 31 and the side latching post 32 of the circulating member 3 are respectively aligned with the corresponding positioning holes 17 and The inner spiral groove 16. Then, the positioning post 31 is moved toward the corresponding positioning hole 17 and penetrates into it. When the side latching post 32 is latched to the inner spiral groove 16, the positioning post 31 cannot continue to be connected to the corresponding positioning hole 17. The positioning hole 17 moves and rotates, so that the circulating member 3 can be firmly fixed to the nut 1. After that, the balls 4 are sequentially inserted into the through hole 15 via the end surface 14 side to be installed in the inner spiral groove 16 of the nut 1, and the screw shaft 2 is rotated at the same time to make the balls 4 follow Sequence into the circulation channel P.

Referring to Figures 2, 3, and 6, before the balls 4 are installed in the other positioning hole 17, the other circulating member 3 is assembled according to the aforementioned assembly method, so that the positioning pillar of the other circulating member 3 31 passes through the other positioning hole 17, and the side latching post 32 is latched to the inner spiral groove 16. After that, the remaining balls 4 are assembled according to the aforementioned method, so that the balls 4 can be accommodated in the circulation channel P, the end return holes 313 and the middle return hole 18.

Each circulating member 3 is inserted into the corresponding positioning hole 17 through the positioning post 31, and can play a role of pre-positioning during the assembly process to prevent the positioning post 31 from moving in the corresponding positioning hole 17 During the process, it swayed randomly along the extension direction perpendicular to the positioning hole 17. Each of the circulating members 3 is locked in the inner spiral groove 16 by the side locking pin 32, which can prevent the positioning pin 31 from rotating in the corresponding positioning hole 17, so that the end return hole 313 is The first opening 314 and the second opening 315 can be accurately aligned and communicated with the middle return hole 18 and the circulation channel P, respectively. Thereby, each of the circulating members 3 can be firmly fixed in the nut 1 without additional locking by other fasteners.

In addition, each of the circulating members 3 is embedded in the outer spiral groove 21 by partially protruding the side latching post 32 from the inner end surface 312, so that the side latching post 32 can be stably positioned on the screw shaft 2 on. Furthermore, since each positioning hole 17 is a circular hole, and the positioning post 31 and the side latching post 32 of each circulating member 3 are each circular post, the design and manufacture of the aforementioned structure are very simple. Thus, the manufacturing cost can be reduced.

To sum up, in the ball screw 100 of this embodiment, each of the circulating members 3 is inserted into the corresponding positioning hole 17 through the positioning column 31, and the side locking column 32 is locked in the inner spiral groove. In the groove 16, each circulating member 3 can be firmly fixed in the nut 1. Since each of the circulating parts 3 and the nut 1 can be firmly fixed together without being locked by additional fasteners such as screws, the number of components of the ball screw 100 can be reduced to improve assembly convenience And reduce the overall manufacturing cost, so it can indeed achieve the purpose of cost-new style.

However, the above are only examples of the present model, and should not be used to limit the scope of implementation of the present model, all simple equivalent changes and modifications made in accordance with the patent scope of the present model application and the contents of the patent specification still belong to This new patent covers the scope.

100: Ball screw 1: nut 11: Inner peripheral surface 12: Outer peripheral surface 13: end face 14: end face 15: Through hole 16: inner spiral groove 17: positioning hole 18: Medium return hole 2: Screw shaft 21: Outer spiral groove 3: Loop parts 31: Positioning column 311: Outer peripheral surface 312: inner end face 313: End return hole 314: first opening 315: second opening 32: Side card latch 4: Ball A: Axial P: Circulation channel

The other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, among which: Figure 1 is a perspective view of an embodiment of the new ball screw; Figure 2 is a three-dimensional exploded view of the embodiment, illustrating the assembly relationship between a nut, a screw shaft, two circulating parts, and a plurality of balls; Fig. 3 is a cross-sectional view taken along the line III-III in Fig. 1, illustrating that a positioning post of each circulating member is penetrated and positioned in a corresponding positioning hole, and one end of the circulating member is connected to the return hole One end of the return hole in the nut; Figure 4 is a perspective view of the circulating parts of the embodiment; Figure 5 is a cross-sectional view taken along the line V-V in Figure 1, illustrating that one side of the loop member is locked in an inner spiral groove of the nut, and the loop member The end return hole is connected to one end of a circulation channel; and Fig. 6 is a cross-sectional view taken along the VI-VI line in Fig. 1.

100: Ball screw

1: nut

11: Inner peripheral surface

12: Outer peripheral surface

13: end face

14: end face

15: Through hole

16: inner spiral groove

17: positioning hole

2: Screw shaft

21: Outer spiral groove

3: Loop parts

31: Positioning column

32: Side card latch

4: Ball

A: Axial

Claims (6)

A ball screw, including: A nut is formed with an inner spiral groove, two positioning holes spaced apart and connected to the inner spiral groove, and a middle return hole between the positioning holes, and the positioning holes are along an axis of the nut Spaced apart A screw shaft passing through the nut and forming an outer spiral groove communicating with the inner spiral groove, a part of the outer spiral groove and a part of the inner spiral groove together form a circulation channel; Two circulating parts are arranged in opposite directions along the axial direction of the nut, each circulating part penetrates the corresponding positioning hole and is locked in the inner spiral groove, and each circulating part is formed with a connecting hole An end return hole between one end of the middle return hole and one end of the circulation channel; and A plurality of balls are accommodated in the circulation channel, the end return holes and the middle return hole. The ball screw according to claim 1, wherein each of the circulating members includes a positioning column penetrating through the corresponding positioning hole, and a side locking column latched to the inner spiral groove, the positioning column Define the end return hole. The ball screw according to claim 2, wherein the positioning column has an outer peripheral surface and an inner end surface connected to the inner end of the outer peripheral surface, and the side latching post is protruding from the outer peripheral surface and partially protrudes from the inner end surface And embedded in the outer spiral groove. The ball screw according to claim 3, wherein the side latching post is integrally protruding from the positioning post and forms a continuous structure therewith, so that each of the circulating parts is a single independent component. The ball screw according to claim 1, wherein each of the circulating members includes a positioning column penetrating through the corresponding positioning hole, and a side latching column protruding from one side of the positioning column, the positioning column The end return hole is defined, and the side locking pin is locked in the inner spiral groove and partially embedded in the outer spiral groove. The ball screw according to claim 2, 3, 4 or 5, wherein each positioning hole is a circular hole, and the positioning post and the side latching post of each circulating member are each a circular post.

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