TWI527980B - Ball screw with scraper - Google Patents

Description

Ball screw with wiper

The present invention relates to a scraper for a ball screw, and more particularly to a wiper fixing method capable of preventing false preload generation.

The ball screw uses the rolling of the ball to drive the relative displacement of the screw and the nut, and has the advantages of low friction and high precision. If any dust or dust enters, it will affect the action and precision of the ball screw. Dust-proof measures have become important; for this reason, many techniques for dust-proofing of ball screws have been developed on the market, one of which is provided with a ring-shaped wiper at one end of a nut (A) as shown in the first figure. (B), the nut (A) has opposite two screw holes (A1) in the radial direction, and is respectively locked by a screw (A2) and passes through the two screw holes (A1), and the screw (A2) ) the wiper (B) is clamped by both sides, so that the wiper (B) is fixed in the nut (A), so that the lip (B1) of the wiper (B) can accommodate In the rolling groove (C1) of the screw (C) of the ball screw, when the ball screw is actuated, the lip (B1) of the wiper (B) is rolled along with the rotation of the screw (C) The function of scraping foreign matter is generated in the groove (C1), and dust or dust can be prevented from entering the rolling groove (C1), and the ball screw can be kept in a clean state to be accurately operated.

However, after the actual use, it is found that the wiper (B) still has the following defects: First, the wiper (B) should be kept at the pole with the screw (C) when installed. The position that is close to but not in contact is the most ideal state, but the force and depth of the lock are quite difficult to control. If the screw (A2) is locked into the screw hole (A1), the depth is too deep. Pressing the wiper (B) side, causing the lip (B1) of the wiper (B) to press the rolling groove (C1) of the screw (C) to generate a false preload [Note: the pseudo preload is It means that the pre-pressure adjustment between the screw, the nut and the ball of the ball screw is not performed, but the force of the rolling groove (C1) is pressed by the lip (B1), so that the user mistakenly believes that the ball screw has the pre-pressure. However, the pre-pressure is temporary, because if the lip (B1) is worn with the rolling groove (C1), the pre-pressure will disappear and the accuracy of the operation of the device will be oscillated], when the screw (C) rotates, The lip (B1) will not rub in the rolling groove (C1), and the material of the scraper (B) is mostly a material such as plastic which is less than metal, and the lip is in a state of constant friction. (B1) will cause thermal deformation due to high heat, or be ground to generate dust, causing damage to the wiper (B) or dust to affect the accuracy of the operation.

Second, if the depth of the screw (A2) locked into the screw hole (A1) is too shallow, the wiper (B) is prone to loosening and the like; and third, due to the assembly of the wiper ( B), the wiper (B) must first be calibrated so that the lip (B1) of the wiper (B) is accommodated in the rolling groove (C1) of the screw (C) with a gap therebetween. Then adjust the depth of the screw (A2) to avoid contact between the lip (B1) and the rolling groove (C1). Therefore, it is often necessary to repeat the test several times in order to succeed. It takes a long time to assemble the wiper (B), resulting in additional cost waste. Therefore, the squeegee (B) still has a defect to be solved, and the inventors have improved this.

In view of the above problems, the main object of the present invention is to develop a wiper capable The lip is easily aligned with the rolling groove to maintain a gap, and the screw can prevent the screw from being falsely preloaded when the locking force is too large.

In order to achieve the above object, the present invention is a ball screw with a wiper, comprising: a screw extending into a strip-like structure in one direction, defining the extending direction as an axial direction, the outer surface of the screw a spiral rolling groove is provided; a nut having a through hole for the screw, the inner edge surface of the hole is provided with a rolling groove opposite to the rolling groove, and the rolling groove and the rolling groove form a load path The end faces of the nut are respectively provided with an annular alignment groove, and two ends of the perforation are respectively provided with a mounting groove; a plurality of rolling elements are disposed on the load path; and two scrapers, The squeegee is recessed on one end of the axial direction, and the two sides of the groove are respectively defined as a body portion and a locking portion. The body portion is received in the mounting groove, and the locking portion is accommodated. In the alignment groove, the body portion has a through hole through which the screw is disposed, and an inner edge surface of the through hole is provided with a lip protruding toward the rolling groove; wherein the nut is provided with a fixing member, One end of the fixing member abuts against the locking portion.

Preferably, the fixing member is a screw, and the outer diameter surface of the nut is provided with a screw hole communicating with the alignment groove, the screw hole is provided with the screw, wherein the front end of the screw is abutted on the screw The lock.

Preferably, the bottom surface of the groove bears against the end surface of the nut.

Preferably, the gap between the lip and the rolling groove is maintained at a gap, and the optimum value of the gap is 0.01 to 0.04 mm.

Through the structural design of the matching between the scraper and the nut, the fixing member does not directly apply pressure to the body portion when fixing the scraper, but is disposed on the locking portion to fix the scraping. The effect of the brush; in addition, the bottom surface of the groove bears against the end surface of the nut to allow the lip to maintain a gap with the rolling groove to achieve a quick alignment effect and avoid the lip Increase contact between the part and the rolling groove The resistance of the bead screw runs and avoids wear on the lip.

Prior art

A‧‧‧ nuts

A1‧‧‧ screw hole

A2‧‧‧ screws

B‧‧‧Scratch

B1‧‧‧Lip

C‧‧‧ screw

C1‧‧‧ rolling groove

this invention

1‧‧‧ screw

11‧‧‧ rolling groove

2‧‧‧ nuts

21‧‧‧Perforation

211‧‧‧ rolling groove

212‧‧‧Installation slot

22‧‧‧ alignment slot

23‧‧‧ screw holes

24‧‧‧ end face

90‧‧‧Load path

3‧‧‧Scratch

31‧‧‧ Groove

311‧‧‧ bottom

32‧‧‧ Body Department

321‧‧‧through hole

322‧‧‧Lip

33‧‧‧Locking

4‧‧‧ rolling elements

G‧‧‧ screws

X‧‧‧axis direction

T‧‧‧ gap

The first figure is a cross-sectional view of a prior art ball screw with a wiper.

The second figure is a system diagram of the ball screw with a wiper of the present invention.

The third figure is a combination view of the ball screw with the wiper of the present invention.

The fourth figure is a cross-sectional view of the ball screw with the wiper of the present invention.

Referring to the second to fourth embodiments, a ball screw having a wiper includes a screw (1) extending in one direction to a long length. a strip-like structure defining the direction of extension is an axial direction (X), the outer edge of the screw (1) is provided with a spiral rolling groove (11); and a nut (2) having a screw for the screw (2) 1) a perforated hole (21), the inner edge surface of the perforation (21) is provided with a rolling groove (211) opposite to the rolling groove (11), and the rolling groove (11) and the rolling groove (211) form a The load path (90), the end faces (24) of the axial direction (X) of the nut (2) are respectively provided with an annular alignment groove (22), and both ends of the axial direction (X) of the through hole (21) Each is provided with a mounting groove (212); a plurality of rolling elements (4) disposed on the load path (90); two scrapers (3), the wiper (3) is in the axial direction (X) A groove (31) is defined in the recess, and the two sides of the groove (31) are respectively defined as a body portion (32) and a locking portion (33), and the body portion (32) is received in the mounting groove (212) The locking portion (33) is received in the alignment groove (22), and the body portion (32) has a thread for the screw (1) to be worn. a hole (321) having a lip portion (322) protruding toward the rolling groove (11); the manner of fixing the wiper (3) in the embodiment is The outer diameter surface of the nut (2) is machined with a screw that communicates with the alignment groove (22) a wire hole (23), wherein the screw hole (23) is provided with a screw (G) screwed therein, and the front end of the screw (G) is abutted against the locking portion (33), as shown in the fourth figure, Fixing the wiper (3) to the nut (2), and after the wiper (3) is installed, the bottom surface (311) of the groove (31) bears against the nut (2) The end surface (24) is such that the lip portion (322) of the wiper (3) and the rolling groove (11) are disposed at a gap (T), and the gap is determined by the size of the ball screw, and the optimum value is 0.01~ 0.04mm; in addition to the fixing manner of the screw hole and the screw provided in the embodiment, the wiper can be fixed by the snap structure.

By the structural design of the matching between the scraper and the nut, when the scraper is assembled and fixed, the screw is abutted against the locking portion of the scraper, and the lip of the scraper is borrowed The design of the squeegee is provided with a groove, and a gap is maintained with the rolling groove of the screw to avoid contact between the lip and the rolling groove to improve the resistance of the ball screw operation and to prevent the lip from being worn.

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.

1‧‧‧ screw

11‧‧‧ rolling groove

2‧‧‧ nuts

21‧‧‧Perforation

211‧‧‧ rolling groove

212‧‧‧Installation slot

22‧‧‧ alignment slot

23‧‧‧ screw holes

24‧‧‧ end face

90‧‧‧Load path

3‧‧‧Scratch

31‧‧‧ Groove

311‧‧‧ bottom

32‧‧‧ Body Department

321‧‧‧through hole

322‧‧‧Lip

33‧‧‧Locking

4‧‧‧ rolling elements

G‧‧‧ screws

T‧‧‧ gap

X‧‧‧axis direction

Claims (3)

A ball screw with a scraper comprises: a screw extending into a strip-like structure in one direction, defining the extending direction as an axial direction; the outer peripheral surface of the screw is provided with a spiral rolling groove; a cap having a perforation for the screw, the inner edge surface of the perforation being provided with a rolling groove opposite to the rolling groove, the rolling groove and the rolling groove forming a load path, and the end faces of the nut in the axial direction An annular alignment groove is respectively disposed, and two ends of the perforation are respectively provided with a mounting groove; a plurality of rolling elements are disposed on the load path; and two scrapers are concave on one end of the axial direction a recessed portion is defined as a main body portion and a locking portion, the main body portion is received in the mounting groove, and the locking portion is received in the alignment groove, the body portion has a through hole through which the screw is disposed, the inner edge surface of the through hole is provided with a lip protruding toward the rolling groove; wherein the nut is provided with a fixing member, and one end of the fixing member is abutted against the lock Solid. The ball screw with a wiper according to claim 1, wherein the fixing member is a screw, and the outer diameter surface of the nut is provided with a screw hole communicating with the alignment groove, the screw hole providing the screw hole The screw is screwed therein, and the front end of the screw is abutted against the locking portion. The ball screw with a wiper according to claim 1, wherein a bottom surface of the groove bears against an end surface of the nut.