CN214146458U

CN214146458U - Ball screw

Info

Publication number: CN214146458U
Application number: CN202022935114.9U
Authority: CN
Inventors: 樊俊昂
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-27
Filing date: 2020-12-10
Publication date: 2021-09-07
Anticipated expiration: 2030-12-10
Also published as: TWM608102U

Abstract

A ball screw comprises a nut, a screw shaft, two circulating pieces and a plurality of balls. The nut is provided with an inner spiral groove, two positioning holes and a middle backflow hole. The screw shaft penetrates through the nut and is provided with an outer spiral groove communicated with the inner spiral groove, and a part of the outer spiral groove and a part of the inner spiral groove form a circulating channel together. The circulating pieces are arranged in the axial direction of the screw cap in a reverse direction, each circulating piece penetrates through the corresponding positioning hole and is clamped in the inner spiral groove, and an end backflow hole communicated between one end of the middle backflow hole and one end of the circulating channel is formed in each circulating piece. The ball is accommodated in the circulation channel, the end backflow hole and the middle backflow hole. Therefore, each circulating piece can be firmly fixed in the nut.

Description

Ball screw

Technical Field

The present invention relates to a ball screw, and more particularly to a ball screw having a circulating member.

Background

The ball screw is matched with the screw cap, the screw shaft and the circulating piece by the balls capable of circularly moving so as to reduce the friction force of relative rotation between the screw cap and the screw shaft and obtain a smooth linear transmission effect.

When the conventional side-mounting type circulating member is to be assembled to the nut, the circulating member is usually first mounted in the slot of the nut, and then the circulating member is inserted into the circulating member and screwed into the screw hole of the nut by the screw, so as to fix the circulating member to the nut. However, the above-mentioned way of locking by screws increases the number of components of the ball screw, thereby resulting in higher overall manufacturing cost and more complicated and inconvenient assembly process.

Disclosure of Invention

One of the objects of the present invention is to provide a ball screw that can overcome at least one of the disadvantages of the background art.

The object of the present invention and the technical problem to be solved are achieved by the following technical solutions, according to the present invention, a ball screw comprises a nut, a screw shaft, two circulation members, and a plurality of balls, wherein the nut is formed with an inner spiral groove, two positioning holes spaced apart from each other and communicating with the inner spiral groove, and a middle return hole in the middle of the positioning holes, the positioning holes are arranged in an axial direction of the nut at intervals, the screw shaft is inserted into the nut and formed with 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, the circulation members are arranged in an axial direction of the nut, each circulation member is inserted into the corresponding positioning hole and engaged with the inner spiral groove, each circulation member is formed with an end return hole communicating between one end of the middle return hole and one end of the circulation channel, the ball is accommodated in the circulation channel, the end backflow hole and the middle backflow hole.

The utility model discloses a ball screw, each the circulation piece is including wearing to locate and corresponding reference column in the locating hole, and the card drag in the side card drag post of interior spiral slot, the reference column is defined out the end backward flow hole.

The utility model discloses a ball screw, the reference column has the outer peripheral face, and connect in the inner terminal surface of outer peripheral face the inner, protruding the locating of side clip column the outer peripheral face and part protrusion interior terminal surface and embedding outer spiral ditch inslot.

The utility model discloses a ball screw, side card pawl is protruding to be located integratively the reference column constitutes continuous structure rather than, each the circulation piece is single independent component.

The utility model discloses a ball screw, each the circulation piece is including wearing to locate and corresponding reference column in the locating hole, and protruding locating the side clip post of reference column one side, the reference column is defined out the end backward flow hole, side clip post clip in interior spiral slot and partial embedding outer spiral ditch inslot.

The utility model discloses a ball screw, each the locating hole is the circular port, each the reference column of circulation piece reaches side card pawl is circular post.

The beneficial effects of the utility model reside in that: each circulating piece is arranged in the corresponding positioning hole in a penetrating mode through the positioning column, and the side clamping columns are clamped in the inner spiral grooves, so that each circulating piece can be stably fixed in the nut. Since each of the circulating members and the nut can be firmly fixed together without additional locking by a locking member such as a screw, the number of components of the ball screw can be reduced to improve the assembling convenience and reduce the overall manufacturing cost.

Drawings

Fig. 1 is a perspective view of an embodiment of the ball screw according to the present invention;

FIG. 2 is an exploded perspective view of the embodiment illustrating the assembly relationship between a nut, a screw shaft, two endless members, and a plurality of balls;

FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1, illustrating that the positioning post of each of the circulation members is inserted and positioned in the corresponding positioning hole, and the backflow hole at one end of each of the circulation members is communicated with one end of the backflow hole in the nut;

FIG. 4 is a perspective view of the endless member of the embodiment;

FIG. 5 is a cross-sectional view taken along line V-V of FIG. 1, illustrating that the side catching posts of each of the circulation members are caught in the inner spiral grooves of the nuts, and the end return holes of each of the circulation members communicate with one end of the circulation passage; and

fig. 6 is a sectional view taken along line VI-VI in fig. 1.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

Before the present invention is described in detail, it should be noted that in the following description, like elements are represented by like reference numerals.

Referring to fig. 1 and 2, an embodiment of the ball screw 100 of the present invention, the ball screw 100 includes a nut 1, a screw shaft 2, two circulating members 3, and a plurality of balls 4.

Referring to fig. 2 and 3, the nut 1 includes an inner circumferential surface 11, an outer circumferential surface 12, and two

end surfaces

13 and 14. The inner circumferential 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 peripheral surface 12 is opposite to the inner peripheral surface 11. The end faces 13, 14 are spaced apart in the axial direction a, and the through hole 15 is interposed between the

end faces

13, 14. The inner peripheral surface 11 of the nut 1 is recessed toward the outer peripheral surface 12 to form an inner spiral groove 16, and the inner spiral groove 16 is disposed between the

end surfaces

13 and 14 and is communicated with the through hole 15. The nut 1 is formed with two positioning holes 17, and a central return hole 18. The positioning holes 17 are arranged at intervals along the axial direction a of the nut 1 and extend between the inner circumferential surface 11 and the outer circumferential surface 12 respectively, and the positioning holes 17 are communicated with the inner spiral grooves 16. In the present embodiment, each positioning hole 17 is a circular hole. The central return hole 18 is located between the positioning holes 17, and the central return hole 18 extends in the axial direction a of the nut 1.

The screw shaft 2 is arranged in the through hole 15 of the screw cap 1 in a penetrating way, and an outer spiral groove 21 which can be communicated with the inner spiral groove 16 is formed on the screw shaft 2. A portion of the outer spiral groove 21 and a portion of the inner spiral groove 16 can together form a circulation path P.

Referring to fig. 3, 4 and 5, the circulating members 3 are oppositely arranged along the axial direction a of the nut 1, and each circulating member 3 includes a positioning column 31 and a side catch column 32. In the present embodiment, each of the circulating members 3 is made of, for example, metal in an integral manner, and the side latching columns 32 are integrally protruded from one side of the corresponding positioning columns 31 and form a continuous structure with the corresponding positioning columns 31, so that each of the circulating members 3 is a single independent component. This reduces the manufacturing cost of each of the circulation members 3. The positioning post 31 is a circular post for passing through the corresponding positioning hole 17, and the positioning post 31 has an outer peripheral surface 311 and an inner end surface 312 connected to an inner end of the outer peripheral surface 311 (where the inner end refers to an end adjacent to the inner peripheral surface 11). The positioning column 31 defines an end backflow hole 313, the end backflow 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, the end backflow hole 313 has a first opening 314 located at one side of the outer peripheral surface 311 and a second opening 315 located at the other side of the outer peripheral surface 311, and the first opening 314 and the second opening 315 are spaced by about 90 degrees. The first opening 314 and the second opening 315 of the end return hole 313 are respectively used for communicating one end of the middle return hole 18 with one end of the circulation passage P. The side latching column 32 is a circular column protruding from the outer peripheral surface 311 on a side opposite to the second opening 315 and partially protruding from the inner end surface 312, and the side latching column 32 is configured to latch in the inner spiral groove 16 and can be embedded in the outer spiral groove 21.

Referring to fig. 3, 5 and 6, the balls 4 are disposed in the circulation passage P, the end return holes 313 and the middle return hole 18, and can roll in a circulation path formed by the circulation passage P, the end return holes 313 and the middle return hole 18.

Referring to fig. 2, 3 and 5, when the screw shaft 2, the circulating member 3 and the balls 4 are to be assembled to the nut 1, first, a portion of the screw shaft 2 is inserted into the through hole 15 of the nut 1 through the end surface 13 side, 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, so that the positioning column 31 and the side catch column 32 of the circulating member 3 are aligned with the corresponding positioning hole 17 and the corresponding internal spiral groove 16, respectively. Then, the positioning posts 31 move toward the corresponding positioning holes 17 and penetrate into the positioning holes, and when the side latching posts 32 are latched in the inner spiral grooves 16, the positioning posts 31 cannot move and rotate continuously in the corresponding positioning holes 17, so that the circulating member 3 can be stably fixed on the nut 1. Then, the balls 4 are sequentially inserted into the through holes 15 through the end surface 14 side to be mounted in the inner spiral groove 16 of the nut 1, and the screw shaft 2 is rotated at the same time, so that the balls 4 sequentially penetrate into the circulation passage P.

Referring to fig. 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, such that the positioning post 31 of the other circulating member 3 is inserted into the other positioning hole 17, and the side latching post 32 is latched in the inner spiral groove 16. Thereafter, the remaining balls 4 are assembled in the aforementioned manner so that the balls 4 can be accommodated in the circulation passage P, the end return hole 313 and the center return hole 18.

Each of the circulating members 3 is inserted into the corresponding positioning hole 17 through the positioning column 31, so that the positioning column 31 does not shake along the extending direction perpendicular to the positioning hole 17 during the moving process in the corresponding positioning hole 17, and can perform the function of pre-positioning during the whole assembly process. Each of the circulating members 3 is clamped in the inner spiral groove 16 by the side clamping columns 32, which can prevent the positioning columns 31 from rotating relative to the corresponding positioning holes 17, so that the first opening 314 and the second opening 315 of the end return hole 313 can be accurately aligned with and communicated with the middle return hole 18 and the circulating channel P, respectively. Therefore, each circulating piece 3 can be firmly fixed in the nut 1 without being additionally locked by other locking pieces.

Further, each of the circulation members 3 is embedded in the male screw groove 21 by the side catching column 32 partially protruding from the inner end surface 312, so that the side catching column 32 can be stably positioned on the screw shaft 2. Furthermore, the positioning holes 17 are circular holes, and the positioning posts 31 and the side catch posts 32 of the circulating members 3 are circular posts, so that the structure is very simple in design and manufacture, and the manufacturing cost can be reduced.

In summary, in the ball screw 100 of the present embodiment, each of the circulating elements 3 is inserted into the corresponding positioning hole 17 through the positioning column 31, and the side latching columns 32 are latched in the inner spiral grooves 16, so that each of the circulating elements 3 can be stably fixed in the nut 1. Because each circulating piece 3 and nut 1 can be firmly fixed together without additional locking by a locking member such as a screw, the number of components of ball screw 100 can be reduced to improve the assembly convenience and reduce the overall manufacturing cost, thereby achieving the objective of the present invention.

Claims

1. A ball screw; the method is characterized in that:

the ball screw comprises a screw cap, a screw shaft, two circulating pieces and a plurality of balls, wherein the screw cap is provided with an inner spiral groove, two positioning holes which are spaced and communicated with the inner spiral groove and a middle backflow hole which is arranged in the middle of the positioning holes, the positioning holes are spaced and arranged along the axial direction of the screw cap, the screw shaft is arranged in the screw cap in a penetrating way and is provided with an outer spiral groove communicated with the inner spiral groove, one part of the outer spiral groove and one part of the inner spiral groove form a circulating channel together, the circulating pieces are arranged reversely along the axial direction of the screw cap, each circulating piece is arranged in the corresponding positioning hole in a penetrating way and is clamped in the inner spiral groove, each circulating piece is provided with an end backflow hole communicated between one end of the middle backflow hole and one end of the circulating channel, and the balls are contained in the circulating channel, The end backflow hole and the middle backflow hole.

2. The ball screw of claim 1, wherein: each circulating piece comprises a positioning column penetrating through the corresponding positioning hole and a side clamping column clamped in the inner spiral groove, and the positioning column defines the end backflow hole.

3. The ball screw of claim 2, wherein: the positioning column is provided with an outer peripheral surface and an inner end surface connected to the inner end of the outer peripheral surface, and the side clamping column is convexly arranged on the outer peripheral surface and partially protrudes out of the inner end surface to be embedded into the outer spiral groove.

4. The ball screw of claim 3, wherein: the side clamping columns are integrally and convexly arranged on the positioning columns to form a continuous structure with the positioning columns, and each circulating piece is a single independent component.

5. The ball screw of claim 1, wherein: each circulating piece comprises a positioning column which is arranged in the corresponding positioning hole in a penetrating mode and a side clamping column which is convexly arranged on one side of the positioning column, the positioning column defines the end backflow hole, and the side clamping column is clamped in the inner spiral groove and is partially embedded into the outer spiral groove.

6. The ball screw of claim 2, 3, 4 or 5, wherein: each positioning hole is a circular hole, and the positioning column and the side clamping column of each circulating piece are circular columns.