CN211343915U - Dustproof device and ball screw using the same - Google Patents

Abstract

The utility model relates to a dustproof device for a ball screw, which includes a first dustproof part and a second dustproof part. The first dustproof part has a first annular body, and the outer end surface of the first annular body protrudes outwardly with a plurality of first engaging protrusions, and a chip removal groove is formed between two adjacent first engaging protrusions. The second dustproof part has a second annular body, and the inner annular surface of the second annular body protrudes inwardly with a dustproof lip, and the outer annular surface of the second annular body protrudes outwardly with a plurality of second engaging protrusions. These second engaging protrusions of the second dustproof part are embedded in these chip removal grooves of the first dustproof part in a one-to-one manner, and an elastic ring is used to achieve a tightening and fixing effect. Therefore, the dustproof device of the utility model can improve the dustproof performance without affecting the operating stroke. In addition, the utility model also provides a ball screw using the above-mentioned dustproof device.

Description

Dustproof device and ball screw using the same

technical field

The utility model relates to a ball screw, in particular to a dust-proof device and a ball screw using the dust-proof device.

Background technique

During the operation of the ball screw, the cutting chips of the workpiece or the dust in the working environment are easily attached to the surface of the screw, and then with the rotation of the screw and the movement of the nut, these attachments will pass through the screw and the nut. The gap reaches the ball, which interferes with the action of the ball and increases the wear of the ball, which ultimately affects the life and accuracy of the ball screw.

In order to solve the problem of clearance, a wiper is installed at both ends of the traditional nut, and the wiper has a lip accommodated in the outer thread groove of the screw. The attachments in the external thread groove are scraped off. However, after actual use, it is found that the dust-proof ability of the aforementioned wiper is limited, and is not suitable for a relatively harsh working environment (eg, high dust). In order to further improve the dustproof capability, related patent documents such as TWI568956 and US8096201 are to assemble multiple dustproof accessories in an axial stacking manner, but in addition to increasing the difficulty of assembly, the length of the nut will also Therefore, it becomes longer and affects the operation stroke.

Utility model content

The main purpose of the present invention is to provide a dust-proof device for a ball screw, which can improve the dust-proof performance without affecting the operation stroke of the ball screw.

In order to achieve the above-mentioned main purpose, the dust-proof device of the present invention includes a first dust-proof member, a second dust-proof member, and an elastic ring. The first dust-proof member has a first annular body and a plurality of first engaging protrusions, and the first engaging protrusions are arranged on the first annular body in an annular arrangement at equal intervals, so that adjacent A chip removal groove is formed between the two first engaging protrusions. In addition, the outer peripheral surface of each of the first engaging protrusions has a groove; the second dustproof member has a second annular body, a A dustproof lip and a plurality of second engaging protrusions, the second annular body abuts against the first annular body, and the outer annular surface of the second annular body abuts against the first dustproof piece The inner peripheral surface of these first engaging protrusions, the dust-proof lip is provided on the inner ring surface of the second annular body, and the second engaging protrusions are arranged in the form of an annular arrangement at equal intervals. On the outer ring surface of the annular body, the second engaging protrusions of the second dust-proof member are inserted into the chip removal grooves of the first dust-proof member in a one-to-one manner; the elastic ring is arranged on the The grooves of the first engaging parts of the first dust-proof part abut against the second engaging convex parts of the second dust-proof part, so as to provide elastic force between the first dust-proof part and the second dust-proof part. The dust pieces are fixed together.

It can be seen from the above that the dustproof device of the present invention utilizes the matching of the first dustproof member and the second dustproof member (the outer ring surface of the second annular body abuts against these first dustproof members of the first dustproof member). An inner peripheral surface of an engaging convex portion), and is assembled and fixed by the elastic ring, so that the dustproof device of the present invention can improve the dustproof performance without affecting the operation stroke of the ball screw.

Preferably, each of the second engaging protrusions of the second dust-proof member has an engaging groove, and the engaging grooves are used for the elastic ring to be embedded and fixed. In addition, the distance between each of the engaging grooves and the center of the second annular body is greater than the distance between each of the grooves and the center of the first annular body, so as to prevent the elastic ring from falling off.

Preferably, the first annular body has a notch penetrating through the inner and outer end surfaces.

Preferably, the dustproof lip is arc-shaped.

Preferably, the dust-proof lip has two inner and outer opposite inclined surfaces, and the two inclined surfaces have the same inclined direction.

Preferably, the first engaging protrusions are rotationally symmetric with respect to the center of the first annular body, and the second engaging protrusions are rotationally symmetric with respect to the center of the second annular body.

In addition, the present invention also provides a ball screw using the aforementioned dust-proof device, which comprises a screw shaft, a nut displacably arranged on the screw shaft, and an anti-dust device arranged on one end face of the nut. a dustproof device; the dustproof device has a first dustproof piece, a second dustproof piece and an elastic ring; the first dustproof piece has a first annular body and a plurality of first engaging protrusions, these The first engaging protrusions are arranged on the first annular body in an annular arrangement at equal intervals, so that a chip removal groove is formed between two adjacent first engaging protrusions. These first engaging protrusions Abutting against the end surface of the nut, the outer peripheral surface of each of the first engaging protrusions has a groove; the second dustproof member has a second annular body, a dustproof lip and a plurality of second A snap-fit protrusion, the second annular body abuts against the first ring-shaped body, and the outer ring surface of the second ring-shaped body abuts against the first snap-fit protrusions of the first dustproof piece On the inner peripheral surface, the dust-proof lip is arranged on the inner annular surface of the second annular body and contacts the screw shaft, and the second engaging protrusions are arranged on the second annular body in an annular arrangement at equal intervals The outer ring surface of the second dust-proof part is inserted into the chip removal grooves of the first dust-proof part in a one-to-one manner; the elastic ring is arranged on the first dust-proof part. The grooves of the first engaging parts of the dust piece abut against the second engaging convex parts of the second dust piece.

The detailed structure, characteristics, assembly or usage of the dustproof device for ball screw provided by the present invention will be described in the detailed description of the following embodiments. However, those of ordinary skill in the art should understand that these detailed descriptions and the specific embodiments enumerated for implementing the present utility model are only used to illustrate the present utility model, and are not intended to limit the protection scope of the claims of the present utility model.

Description of drawings

FIG. 1 is a perspective view of the dust-proof device according to the first embodiment of the present invention applied to a ball screw.

2 is a perspective view of the dust-proof device according to the first embodiment of the present invention.

3 is an exploded perspective view of the dust-proof device according to the first embodiment of the present invention.

4 is a cross-sectional view of a second dust-proof member provided by the dust-proof device according to the first embodiment of the present invention.

5 is a partial enlarged cross-sectional view of the dust-proof device according to the first embodiment of the present invention used in conjunction with a ball screw.

6 is an exploded perspective view of a dustproof device according to a second embodiment of the present invention.

7 is a cross-sectional view of a second dust-proof member provided by the dust-proof device according to the second embodiment of the present invention.

FIG. 8 is a partial enlarged cross-sectional view of the dust-proof device according to the second embodiment of the present invention used in conjunction with a ball screw.

[Description of main component symbols in the embodiments of the present disclosure in the accompanying drawings]

10 ball screw 12 screw shaft

14 Nut 16 Dustproof device

20 The first dustproof part 22 The first annular body

24 Cut groove 26 First engaging protrusion

28 groove 29 chip flute

30 The second dustproof part 32 The second annular body

34 Dust lip 36 Second engaging protrusion

38 snap groove 40 elastic ring

50 Second dustproof part 52 Dustproof lip

54 Bevel

Detailed ways

The applicant first explains that in the entire specification, including the embodiments described below and the claims, the terms related to the directionality are based on the directions in the drawings. Next, in the embodiments to be introduced below and the accompanying drawings, the same element numbers represent the same or similar elements or their structural features.

Please refer to FIG. 1 first. The ball screw 10 shown in FIG. 1 includes a screw shaft 12 and a nut 14 disposed on the screw shaft 12 displaceably. Please continue to refer to FIG. 2 and FIG. 3 , the dustproof device 16 of the first embodiment of the present invention includes a first dustproof member 20 , a second dustproof member 30 , and an elastic ring 40 . When used in conjunction with the aforementioned ball screw 10 , one dustproof device 16 according to the first embodiment of the present invention is provided at both ends of the nut 14 .

The first dustproof member 20 is an integral structure made of elastic material such as rubber or engineering plastics. The first dustproof member 20 has a first annular body 22, and the first annular body 22 has a notch groove 24 penetrating the inner and outer end surfaces. It is sleeved on the screw shaft 12 . The first dustproof member 20 also has a plurality of first engaging protrusions 26 (the number is not limited, here is an example of eight). The outer end surface of an annular body 22 is rotationally symmetrical with respect to the center of the first annular body 22, so that a chip removal groove 29 is formed between two adjacent first engaging protrusions 26, and these first engaging protrusions The convex portion 26 abuts against the end face of the nut 14 . In addition, the outer peripheral surface of each of the first engaging protrusions 26 has a groove 28 .

The second dustproof member 30 is an integral structure made of elastic material such as rubber or engineering plastic. The second dustproof member 30 has a second annular body 32 , the inner end face of the second annular body 32 abuts against the outer end face of the first annular body 22 of the first dustproof member 20 , and the second annular body The outer ring surface of 32 abuts against the inner peripheral surfaces of the first engaging protrusions 26 of the first dustproof member 20 . The second dustproof member 30 also has a dustproof lip portion 34. The dustproof lip portion 34 is arc-shaped in this embodiment and protrudes from the inner annular surface of the second annular body 32, as shown in FIG. 4 and FIG. As shown in FIG. 5 , the second dustproof member 30 uses the dustproof lip 34 to contact the surface of the screw shaft 12 to scrape off foreign objects (such as dust or cutting chips of the workpiece) adhering to the surface of the screw shaft 12 . The second dustproof member 30 also has a plurality of second engaging protrusions 36 (the number is not limited, and eight are taken as an example here), and these second engaging protrusions 36 are arranged in an annular arrangement at equal intervals on the first The outer annular surfaces of the two annular bodies 32 are rotationally symmetric with respect to the center of the second annular body 32 , and the second engaging protrusions 36 of the second dustproof member 30 are engaged with the first and second dustproof members 30 in a one-to-one manner. Inside these chip flutes 29 of the dustproof member 20 . In addition, the outer end surface of each second engaging portion 36 has an engaging groove 38 , and the distance between each engaging groove 38 and the center of the second annular body 32 is greater than that between each of the grooves 28 and the first annular body 22 The distance from the center is shown in Figure 3 and Figure 5.

The elastic ring 40 is made of elastic material such as rubber or engineering plastic. As shown in FIG. 5 , the elastic ring 40 is disposed in the grooves 28 of the first engaging protrusions 26 of the first dustproof member 20 and is inserted into the second engaging protrusions 36 of the second dustproof member 30 . In the engaging groove 38, on the one hand, elastic force is provided to the first engaging portions of the first dustproof member 20, so that the first engaging convex portions 26 of the first dustproof member 20 are tightly fixed to the screw shaft 12, and the other is On the one hand, elastic force is provided to the second engaging portions 36 of the second dustproof member 30 , so that the second dustproof member 30 is tightly fixed to the first dustproof member 20 . In addition, in addition to the elastic ring 40, the first dustproof member 20 and the second dustproof member 30 may additionally use an adhesive to enhance the fixing effect.

It can be seen from the above that the dustproof device 16 of the present invention utilizes the combination of the first dustproof member 20 and the second dustproof member 30 , for example, the outer ring surface of the second annular body 32 abuts against the first dustproof member 20 . The inner peripheral surfaces of these first engaging protrusions 26 can improve the shortcomings of the prior art when a plurality of dust-proof fittings are stacked in an axial direction, and the elastic rings 40 are used to fasten the two, so that the utility model has the advantages of The dust-proof device 16 can improve the dust-proof performance without affecting the operation stroke of the ball screw 10, and can be easily replaced if the structure is damaged, so as to increase the convenience of use.

It should be added here that the configuration of the dust lip can vary in different ways. As shown in FIGS. 6 to 8 , in the second embodiment of the present invention, the dustproof lip 52 of the second dustproof member 50 has two opposite inner and outer inclined surfaces 54 , and the two inner and outer inclined surfaces 54 have the same inclination direction In this way, the contact area between the dustproof lip 52 and the screw shaft 12 can be increased, thereby enhancing the dustproof effect.

Claims (8)

1. A dust keeper for a ball screw, comprising:

the first dustproof piece is provided with a first annular body and a plurality of first clamping convex parts, the first clamping convex parts are arranged on the first annular body in an equally-spaced annular arrangement mode, so that a chip groove is formed between every two adjacent first clamping convex parts, and the peripheral surface of each first clamping convex part is provided with a groove;

the second dustproof piece is provided with a second annular body, a dustproof lip and a plurality of second clamping convex parts, the second annular body is abutted against the first annular body, the outer annular surface of the second annular body is abutted against the inner circumferential surfaces of the first clamping convex parts of the first dustproof piece, the dustproof lip is arranged on the inner annular surface of the second annular body, the second clamping convex parts are arranged on the outer annular surface of the second annular body in an equally-spaced annular arrangement mode, and the second clamping convex parts of the second dustproof piece are embedded in the chip removal grooves of the first dustproof piece in a one-to-one mode; and

and the elastic ring is arranged in the grooves of the first clamping parts of the first dustproof piece and abuts against the second clamping convex parts of the second dustproof piece.

2. The dust-proof device for a ball screw according to claim 1, wherein each of the second engaging protrusions of the second dust-proof member has an engaging groove, and a part of the elastic ring is fitted in the engaging grooves.

3. The dust-proof device for a ball screw according to claim 1 or 2, wherein a distance between each of the engaging grooves and a center of the second annular body is larger than a distance between each of the grooves and a center of the first annular body.

4. The dust keeper of claim 1, wherein the first annular body has a groove extending through both the inner and outer end surfaces.

5. The dust keeper of claim 1, wherein the dust lip is arcuate.

6. The dust prevention device for a ball screw of claim 1, wherein the dust lip portion has two inner and outer opposite inclined surfaces having the same inclination direction.

7. The dust-proof device for a ball screw according to claim 1, wherein the first engaging protrusions are rotationally symmetrical with respect to a center of the first annular body, and the second engaging protrusions are rotationally symmetrical with respect to a center of the second annular body.

8. A ball screw, comprising:

a screw shaft;

a nut displaceably provided on the screw shaft; and

a dust-proof device, set up in an terminal surface of this nut, this dust-proof device has:

the first dustproof piece is provided with a first annular body and a plurality of first clamping convex parts, the first clamping convex parts are arranged on the first annular body in an equally-spaced annular arrangement mode, so that a chip groove is formed between every two adjacent first clamping convex parts, the first clamping convex parts abut against the end face of the nut, and the peripheral surface of each first clamping convex part is provided with a groove;

the second dustproof piece is provided with a second annular body, a dustproof lip and a plurality of second clamping convex parts, the second annular body is abutted against the first annular body, the outer annular surface of the second annular body is abutted against the inner circumferential surfaces of the first clamping convex parts of the first dustproof piece, the dustproof lip is arranged on the inner annular surface of the second annular body and contacts with the screw shaft, the second clamping convex parts are arranged on the outer annular surface of the second annular body in an equally-spaced annular arrangement mode, and the second clamping convex parts of the second dustproof piece are embedded in the chip grooves of the first dustproof piece in a one-to-one mode; and

and the elastic ring is arranged in the grooves of the first clamping parts of the first dustproof piece and abuts against the second clamping convex parts of the second dustproof piece.

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