TW201315914A - Dustproof element of ball screw - Google Patents

Abstract

A dustproof element of a ball screw is mounted in the ball screw. The dustproof element has a through hole. The through hole has an inside circumference from which a dustproof lip projects to mate a first threading groove. The dustproof lip has a first end and a second end in an axial direction. The first and second ends respectively form first and dustproof faces that are opposite to each other. The first dustproof face forms a first gap with respect to the first threading groove, and the first gap is arranged to gradually reduce from the first end to the second end. The second dustproof face forms a second gap with respect to the first threading groove, and the second gap is arranged to gradually expand from the first end to the second end. As such, the dustproof element has a simple structure and is easy to manufacture so that the assembling efficiency of screw and nut can be enhanced.

Description

Ball screw dustproof component

The present invention relates to a dustproof member, and more particularly to a dustproof member of a ball screw.

According to the conventional ball screw, there is a screw and a nut. The outer surface of the screw has a first thread groove. The inner surface of the nut has a second thread groove corresponding to the first thread groove, and the second thread groove forms a thread path with the first thread groove. The plurality of rolling elements are limited to scrolling in the thread path. The friction between the screw and the nut is reduced by the point contact between the rolling elements and the screw and the nut to facilitate the nut running on the screw.

Since the ball screw drives components in various types of machines, it often encounters the adhesion of foreign matter or dust on the screw. If it is not removed, the nut and the rolling elements are directly moved along with the foreign matter or dust. It is feared that the life of the screw, the nut and the rolling elements will be shortened and the operation will not be smooth. In this regard, there have been creations such as U.S. No. 5,722,294 and U.S. Patent No. 693,1955 which can be used to remove foreign matter and dust on the screw in time to maintain the smooth operation and service life of the ball screw.

However, the above-mentioned U.S. Patent No. 5,722,294 discloses that the wiper is divided into two sections, and the keyway and the key part for the combination must be pre-formed, and the process of the wiper is complicated, and the assembly convenience and accuracy are tested. Further, it is the U.S. Patent No. 693,1955, which uses a multi-stage wiper and different wipers are made of different materials, which is quite difficult to manufacture and assemble.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a dustproof member for a ball screw which is easy to manufacture and easy to assemble, so that assembly efficiency of the screw nut can be increased.

In order to achieve the foregoing object, a dustproof member for a ball screw according to the present invention is used for a ball screw having a screw and a nut having a first thread groove on an outer surface thereof. The inner surface of the nut has a second thread groove corresponding to the first thread groove, and the second thread groove and the first thread groove form a thread path, and the plurality of rolling elements are limited to Rolling in a threaded path; the dustproof member is disposed on the nut, wherein the dustproof member has a through hole for the screw to be inserted, and a dustproof portion is protruded from the inner edge of the through hole The lip portion has a first end and a second end in the axial direction, and the first end and the second end respectively form a first dustproof surface and a second dustproof surface disposed opposite to each other. a first gap is formed between the first dustproof surface and the first thread groove, and the first gap is tapered from the first end to the second end; the second dustproof surface and the first thread groove There is a second gap between the two, and the second room Was from the first end to the second end of the divergent distribution system.

The structure of the dustproof member is simple and simple to manufacture, and because the first gap between the first dustproof surface and the first thread groove is tapered, the assembly has a high assembly margin. The dustproof component provided by the invention is simple to manufacture and convenient to assemble, and can increase the assembly efficiency of the screw nut.

In order to explain in detail the technical features of the present invention, one of the following preferred embodiments will be described with reference to the following drawings, wherein: as shown in the first to seventh embodiments, a preferred embodiment of the present invention is provided. The dustproof member 10 of the ball screw is used for a ball screw 80. The ball screw 80 has a screw 81 and a nut 82. The outer surface of the screw 81 has a first thread groove 811, and the nut 82 has an inner surface. a second thread groove 821 corresponding to the first thread groove 811, and the second thread groove 821 and the first thread groove 811 together form a thread path 83, and the plurality of rolling elements 84 are limited to the thread Scroll in path 83.

The dustproof member 10 is disposed on the nut 82, and the dustproof member 10 has a through hole 11 through which the screw 81 is disposed, and the first thread groove 811 protrudes from the inner edge of the through hole 11. a dust-proof lip portion 12 having a first end 121 and a second end 122 in the axial direction, the first end 121 and the second end 122 are respectively formed with opposite ones a first gap D1 is defined between the first dust-proof surface 123 and the first threaded groove 811, and the first gap D1 is from the first end 121 to the second end 122. The second dust-proof surface 124 and the first thread groove 811 have a second gap D2, and the second gap D2 is gradually distributed from the first end 121 to the second end 122.

It is worth mentioning that in the preferred embodiment, the nut 82 forms a positioning recess 852 and a pair of tooth recesses 853 at the end faces. The dustproof member 10 is formed on the outer edge thereof, and the positioning concave portion 852 and the pair of concave portions 853 respectively form a positioning convex portion 13 and a pair of dent portion 14 , and the positioning convex portion 13 is combined with the positioning concave portion 852 and The pair of dentitions 14 and the pair of dents 853 are combined to limit the relative position of the dustproof member 10 and the nut 82. On the assembly of the dustproof member 10, only the positioning protrusion 13 and the pair of dentitions are required. 14 is respectively disposed in the positioning concave portion 852 and the pair of concave concave portions 853, so that the dustproof member 10 can be completed without additional alignment and correction.

Regarding the manufacturing method of the dustproof member 10, the dustproof member 10 can be produced by injection molding or by the transfer molding according to the user's selection.

In order to adjust the position between the dustproof member 10 and the nut 85, a gasket 15 is disposed between the dustproof member 10 and the nut 85, and the dustproof member 10 and the nut 85 are adjusted by changing the thickness of the washer 15. The location between.

It should be further noted that, in the preferred embodiment, if the position of the first thread groove 811 of the screw 81 in the through hole 11 is predicted, the dustproof member 10 can also be protected from dust. The end face of the fitting 10 has a tooth point 16 for comparison with the first thread groove 811 of the screw 81.

Therefore, the structure of the dustproof member 10 is simple and simple to manufacture, and since the first gap D1 between the first dust-proof surface 123 and the first thread groove 811 is tapered, the assembly is high. The dustproof component 10 provided by the present invention is simple to manufacture and convenient to assemble, and the assembly efficiency of the screw nut can be increased.

10. . . Dustproof component

11. . . Through hole

12. . . Dust lip

121. . . First end

122. . . Second end

123. . . First dust surface

124. . . Second dust surface

13. . . Positioning convex

14. . . Tooth convex

15. . . washer

16. . . Tooth point

80. . . Ball screw

81. . . Screw

811. . . First thread groove

82. . . Nut

821. . . Second thread groove

83. . . Thread path

84. . . Rolling body

852. . . Positioning recess

853. . . To the concave

D1. . . First gap

D2. . . Second gap

The first drawing is an exploded view of a preferred embodiment of the present invention;

The second drawing is a cross-sectional view of a preferred embodiment of the present invention;

The third drawing is a top view of the dustproof component of the preferred embodiment of the present invention;

Figure 4 is a perspective view of a dustproof member of a preferred embodiment of the present invention;

Figure 5 is a cross-sectional view of a dustproof member of a preferred embodiment of the present invention;

Figure 6 is a partial cross-sectional view of a preferred embodiment of the present invention showing the screw and the dustproof member;

Figure 7 is a partial enlarged view of the sixth figure showing the screw and dustproof components

Figure 8 is a partial cross-sectional view of a preferred embodiment of the present invention showing the screw and the dustproof member;

The ninth drawing is a partially enlarged view of the eighth figure showing the screw and the dustproof member.

10. . . Dustproof component

11. . . Through hole

12. . . Dust lip

121. . . First end

122. . . Second end

123. . . First dust surface

124. . . Second dust surface

13. . . Positioning convex

14. . . Tooth convex

16. . . Tooth point

Claims (6)

A ball screw dustproof component is used for a ball screw, the ball screw has a screw and a nut, the screw has a first thread groove on an outer surface, and the nut has an inner surface with the first thread groove Corresponding a second thread groove, and the second thread groove and the first thread groove form a thread path, and the plurality of rolling elements are restricted to roll in the thread path; the dustproof element is disposed on the thread The cap is characterized in that: the dustproof member has a through hole for the screw, and a dust lip is protruded from the inner edge of the through hole, and the dust lip has one of the axial directions. The first end and the second end respectively form a first dustproof surface and a second dustproof surface disposed opposite to each other, and the first dustproof surface and the first threaded groove have a first gap, and the first gap is tapered from the first end to the second end; a second gap is formed between the second dustproof surface and the first thread groove, and the second gap is The first end to the second end are in a divergent distribution. The dustproof member of the ball screw according to the first aspect of the invention, wherein: the nut forms a positioning recess and a pair of tooth recesses on the end surface; the dustproof member respectively fits the positioning recess and the pair on the outer edge thereof The concave portion forms a positioning convex portion and a pair of dental convex portions. The positioning convex portion is combined with the positioning concave portion and the pair of dental convex portions are combined with the pair of concave portions to restrict the relative position of the dustproof member and the nut. A dustproof member for a ball screw according to claim 1, wherein the dustproof member is produced by injection molding. A dustproof member for a ball screw according to claim 1, wherein the dustproof member is produced by transfer molding. A dustproof member for a ball screw according to claim 1, wherein a gasket is disposed between the dustproof member and the nut. The dustproof component of the ball screw of claim 1, wherein the end surface of the dustproof fitting has a toothing point for comparing the first thread groove of the screw.