TWI401373B - Ball screw having a dust keeper - Google Patents

Description

Ball screw with dustproof device

The invention is an accessory for a linear transmission component, in particular a ball screw with a dustproof device.

Referring to FIG. 1A and FIG. B, a conventional dustproof device is disposed on a ball screw, and the ball screw is composed of a screw 1, a nut 2 and a plurality of rolling elements A. A rolling groove 11 is disposed on the outer surface of the screw, and the nut 2 is disposed on the screw 1 and is provided with a rolling groove 21 opposite to the rolling groove 11. The rolling groove 11 and the rolling groove 21 form a load path. The path is provided for the rolling element A, and the dustproof device 3 is disposed at both ends of the nut 2, and the dustproof device 3 protrudes toward the rolling groove 11 by a scraping portion 31, and the scraping portion 31 is coupled to The rolling groove 11 is in contact to prevent foreign matter from invading the inside of the nut. However, the conventional dustproof device 3 cannot completely block the foreign matter from invading the inside of the nut because the rolling groove 11 of the screw 1 is formed by extrusion. A groove 12 is formed between the rolling grooves 11 due to the pressing relationship, and foreign matter is accumulated in the groove 12, and the configuration of the dustproof device 3 cannot remove the foreign matter accumulated in the groove 12. Therefore, the foreign matter enters the inside of the nut 2 from the groove 12, thereby interfering with the operation of the rolling member A. Smooth operation of the ball screw is reduced, also cause further rolling groove of the ball screw 11 or the wear of the rolling groove 21, and reduce the precision ball screw, is severely damaged, and therefore there is a real need for improvement.

Based on the problems of the above-mentioned conventional techniques, the inventors of the present invention have succeeded in research and development, and the inventions which can achieve the object of the following inventions are finally born.

That is, the primary object of the present invention is to develop a dustproof device capable of removing foreign matter from the surface of a screw which is extruded.

In order to achieve the above object, the present invention is a ball screw with a dustproof device, comprising: a screw, the outer edge of which is provided with a spiral rolling groove, and the rolling groove has a spiral groove; a nut having a through hole for the screw, wherein the inner edge surface of the hole is provided with a rolling groove opposite to the rolling groove, the rolling groove and the rolling groove form a load path; and the dustproof device is installed on the nut The dustproof device is provided with a through hole through which the screw is disposed, and the inner edge surface of the through hole is provided with a first scraping portion protruding toward the rolling groove, and the first scraping portion is Rolling groove contact, the through hole is further provided with a second scraping portion protruding toward the groove, and the second scraping portion is in contact with the groove.

Wherein, the load path is provided with a plurality of rolling elements.

Wherein, the nut is provided with a reflow member, and the reflow member is provided with a return passage for circulating the rolling member.

The two ends of the nut are respectively provided with a mounting groove for receiving and positioning the dustproof device.

Wherein, the second scraping portion of the dustproof device is a spiral protrusion.

The second scraping portion of the dustproof device is a columnar body that protrudes toward the center of the through hole.

Wherein, the dustproof device can be divided into two parts, the first part has a first scraping portion, and the second part has a second scraping portion.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the description of the embodiments of the invention. By.

Referring to FIG. 2 to FIG. 7 , the present invention is a ball screw with a dustproof device, comprising: a screw 4 having a spiral rolling groove 41 at an outer edge thereof, the rolling groove 41 having a a spiral groove 42; a nut 5 provided with a through hole 51 for the screw 4 to be bored, the inner edge surface of the hole 51 is provided with a rolling groove 511 opposite to the rolling groove 41, the rolling groove 41 and the rolling The slot 511 is configured as a load path, and a mounting slot 512 is defined in each end of the nut 5; a plurality of rolling elements 8 are disposed on the load path; and a reflow member 7 is mounted on the nut 5, the reflow The member 7 is provided with a return passage 71 for providing circulation of the rolling member 8.

The dust-proof device 6 is mounted on the mounting groove 512 of the nut 5. The dust-proof device 6 is provided with a through hole 61 through which the screw 4 is disposed. The inner surface of the through hole 61 is provided with a convex surface toward the rolling groove 41. The first scraping portion 611 is in contact with the rolling groove 41. The through hole 61 is further provided with a second scraping portion 612 protruding toward the recess 42. The second scraping portion The 612 is in contact with the groove 42; the cross section of the first scraping portion 611 is the same as the cross section of the rolling groove 41, and the dustproof effect is higher; the cross section of the second scraping portion 612 is disposed as the groove 42. The same cross section has a higher dustproof effect.

In order to clarify the implementation features of the present invention, the following description shows a more advanced and practical manner of the present invention: the present invention is a ball screw with a dustproof device, the screw of the ball screw is provided with a spiral rolling groove, the rolling The groove system is formed by extrusion, so that there is a groove between the rolling grooves, wherein the dustproof device is in contact with the rolling groove by the first scraping portion, and the second scraping portion and the groove Contact to achieve double layer to prevent foreign matter from invading the inside of the nut, so that the rolling member can run smoothly between the screw and the nut, and improve the positioning accuracy of the ball screw and prolong the service life.

In view of the above, the "industrial availability" of the present invention should be unquestionable. In addition, the feature technology disclosed in the embodiment of the present invention has not been seen in publications before the application, nor has it been disclosed. The use of not only has the fact that the effect is improved as described above, but also has an additional effect that cannot be neglected. Therefore, the "novelty" and "progressiveness" of the present invention are in compliance with the patent regulations, and the application for the invention patent is filed according to law. Please give us a review and grant a patent as soon as possible.

The above description of the embodiments is intended to be illustrative of the invention and is not intended to limit the scope of the invention.

Conventional technology

1. . . Screw

11. . . Rolling groove

12. . . Groove

2. . . Nut

twenty one. . . Rolling groove

3. . . Dustproof device

31. . . Scraping section

A. . . Rolling element

this invention

4. . . Screw

41. . . Rolling groove

42. . . Groove

5. . . Nut

51. . . perforation

511. . . Rolling groove

512. . . Mounting slot

6. . . Dustproof device

61. . . Through hole

611. . . First scraping section

612. . . Second scraping section

7. . . Reflow piece

71. . . Return channel

8. . . Rolling element

Figure 1A is a cross-sectional view of a ball screw of a conventional dustproof device.

Figure 1B is a cross-sectional view of a ball screw of a conventional dustproof device.

Figure 2 is a perspective view of the dustproof device of the present invention.

Figure 3 is an exploded view of the ball screw with the dustproof device of the present invention.

Figure 4 is a combination view of a ball screw with a dustproof device of the present invention.

Figure 5 is an end view of the ball screw with the dustproof device of the present invention.

Figure 6 is a cross-sectional view taken along line A-A of Figure 5.

Figure 7 is a cross-sectional view taken along line B-B of Figure 5.

4‧‧‧ screw

41‧‧‧ rolling groove

42‧‧‧ Groove

5‧‧‧ nuts

51‧‧‧Perforation

511‧‧‧ rolling groove

512‧‧‧Installation slot

6‧‧‧Dust-proof device

612‧‧‧Second scraping section

8‧‧‧Rolling parts

Claims (4)

A ball screw with a dustproof device comprises: a screw, the outer edge of which is provided with a spiral rolling groove, the rolling groove has a spiral groove; a nut is provided for the screw to be worn a perforation is provided, the inner edge surface of the perforation is provided with a rolling groove opposite to the rolling groove, the rolling groove and the rolling groove form a load path; and the dustproof device is installed at both ends of the nut, and the dustproof device is a through hole for the screw is disposed, the inner edge surface of the through hole is provided with a first scraping portion protruding toward the rolling groove, and the first scraping portion is in contact with the rolling groove, and the through hole is further provided with a And a second scraping portion protruding toward the groove, the second scraping portion is in contact with the groove; wherein the second scraping portion of the dustproof device is a spiral protrusion. A ball screw with a dustproof device comprises: a screw, the outer edge of which is provided with a spiral rolling groove, the rolling groove has a spiral groove; a nut is provided for the screw to be worn a perforation is provided, the inner edge surface of the perforation is provided with a rolling groove opposite to the rolling groove, the rolling groove and the rolling groove form a load path; and the dustproof device is installed at both ends of the nut, and the dustproof device is a through hole for the screw is provided, and a surface of the inner edge of the through hole is provided with a first scraping portion protruding toward the rolling groove, and the first scraping portion is Rolling groove contact, the through hole is further provided with a second scraping portion protruding toward the groove, the second scraping portion is in contact with the groove; wherein the second scraping portion of the dustproof device is facing the through The columnar body protruding from the center of the hole. A ball screw for a dustproof device according to claim 1 or 2, wherein the dustproof device is divided into two parts, the first part having a first scraping portion and the second part having a second scraping portion. The ball screw with a dustproof device according to claim 1 or 2, wherein each of the two ends of the nut is provided with a mounting groove for receiving and positioning the dustproof device.