TWM523027U - Ball screw with brushing device - Google Patents

Description

Ball screw with wiper

This creation is related to the scraper of the ball screw, especially a wiper fixing method which is easy to install and can prevent the occurrence of false preload.

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 very important; for this reason, many techniques for dust-proofing of ball screws have been developed on the market, one of which is shown in Figure 4, with a ring-shaped wiper at one end of a nut (A). (B), the nut (A) has opposite two screw holes (A1) in the radial direction, and the assembler must hold the electric drill, and drill the drill bit from the screw hole (A1) into the scraper (B). Two pairs of recessed holes (C2) of the screw hole (A1), and respectively locked by a screw (A2) and passed through the two screw holes (A1), and the screw (A2) is inserted into the recessed hole (C2) Fixing the wiper (B) to fix the wiper (B) in the nut (A), so that the lip (B1) of the wiper (B) can be accommodated in the ball screw In the rolling groove (C1) of the screw (C), when the ball screw is actuated, the lip of the wiper (B) B1) The function of scraping foreign matter is generated in the rolling groove (C1) as the screw (C) rotates, and in addition, dust or dust can be prevented from entering the rolling groove (C1), and the ball screw is kept clean. In the state of being able to act accurately.
However, after actual use, it has been found that such a wiper (B) still has the following defects:
First, the installer must use an electric drill to machine the recessed hole (C2), resulting in an extended assembly time, and is prone to work-related accidents. In addition, the drill generated during the drill will also fall into the nut, if not Cleaning will affect the smoothness of the ball screw operation and cause serious damage.
Secondly, the wiper (B) should be placed in an extremely close but not in contact with the screw (C), which is the most ideal state, but the force and depth of the lock are quite difficult to control. If the depth of the screw (A2) locked into the screw hole (A1) is too deep, the wiper (B) will be pressed by both sides, and the lip (B1) of the wiper (B) is pressed. False preloading due to the rolling groove (C1) of the screw (C) [Note: False preloading refers to the adjustment of the pre-pressure between the screw of the ball screw, the nut and the ball, but due to the lip ( B1) pressing the force of the rolling groove (C1), the user mistakenly believes that the ball screw has a pre-pressure, but the pre-pressure is temporary, because the lip (B1) is worn after the rolling groove (C1), The pre-pressure will disappear and the accuracy of the operation of the device will be evoked. When the screw (C) rotates, the lip (B1) will continuously rub in the rolling groove (C1), and the wiper (B) The material is mostly made of plastic and other materials with a hardness lower than that of metal. The lip (B1) will be heated due to high friction. Thermal deformation, or is ground dust, damage or the influence of the dust wiper (B) actuation accuracy problems. 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 purpose of the creation is to develop a wiper fixing structure that is easy to assemble and to avoid false pre-stressing of the scraper after assembly.
In order to achieve the above object, the present invention is a ball screw with a scraper, comprising: a screw which is elongated into a long strip structure in one direction, defining the direction of elongation as an axial direction, and the outer edge of the screw is provided a spiral rolling groove; a nut having a through hole for the screw sleeve, the inner edge surface of the through hole is provided with a rolling groove opposite to the rolling groove, and the rolling groove and the rolling groove form a load a path, the two ends of the through hole are respectively provided with a mounting groove, the outer edge surface of the nut is through a plurality of screw holes communicating with the mounting groove; a plurality of rolling systems are disposed in the load path; The squeegee is provided in an annular structure, the inner ring surface is provided with a lip corresponding to the rolling groove, and the outer ring surface is provided with an annular groove, and the groove is provided with an elastic member; After the plurality of screw bolts are disposed on the screw hole, the end of the screw is in contact with the elastic member, thereby restricting the rotation of the wiper and the degree of freedom in the axial direction.
The present invention provides the elastic member by the groove of the wiper, and the groove is used to replace the conventional drilling operation, and the screw extends into the groove to limit the axial freedom of the wiper, but Because the groove is an annular groove, the degree of freedom of rotation of the wiper cannot be limited. Therefore, the present invention can achieve the limitation of the scraping when the screw is in contact with the elastic member by the elastic member. The effect of the rotation degree of the brush, and when the screw lock is too tight, the elastic member absorbs the locking force without transmitting the locking force to the lip of the wiper, thereby avoiding The problem of false preloading arises, so this creation completely solves the problems of the prior art.

Prior art
A‧‧‧ nuts
A1‧‧‧ screw hole
A2‧‧‧ screws
B‧‧‧Scratch
B1‧‧‧Lip
C‧‧‧ screw
C1‧‧‧ rolling groove
C2‧‧‧ concave hole creation
1‧‧‧ screw
11‧‧‧ rolling groove
2‧‧‧ nuts
21‧‧‧through hole
211‧‧‧ rolling groove
22‧‧‧ screw holes
23‧‧‧Installation slot
3‧‧‧Scratch
31‧‧‧Lip
32‧‧‧ Groove
4‧‧‧Flexible parts
5‧‧‧ rolling elements
7‧‧‧ screws
71‧‧‧End
X‧‧‧axis direction
H‧‧‧thickness
T‧‧ depth

The first figure is a system diagram for creating a ball screw with a wiper.
The second figure is a combination diagram of a ball screw with a wiper.
The third figure is a cross-sectional view of the ball screw of the scraper.
The fourth figure is a cross-sectional view of the ball screw of the prior art with a wiper.

Referring to the first to third figures, the present invention is a ball screw with a wiper comprising: a screw (1) which is elongated in a direction into a strip-like structure, defining the direction of elongation as an axis Direction (X), the outer edge surface of the screw (1) is provided with a spiral rolling groove (11); a nut (2) having a through hole (21) for the screw (1) to be sleeved, The inner edge surface of the through hole (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 load path, and the through hole (21) Each of the two ends is provided with a mounting groove (23), and the outer surface of the nut (2) penetrates a plurality of screw holes (22) communicating with the mounting groove (23); the plurality of rolling elements (5) are provided In the load path, the two scrapers (3) are respectively disposed on the two mounting grooves (23), and the scraper (3) has an annular structure, and the inner ring surface is provided with a corresponding rolling groove (11). The lip portion (31) is provided with an annular groove (32) on the outer ring surface, and the elastic member (4) is disposed in the groove (32). In the embodiment, the elastic member (4) is a ring. The squeegee (3) and the elastic member (4) can be integrally formed by a two-shot injection molding method, and the elastic member (4) can also be composed of a plurality of members and arranged at intervals in the groove (32). After the plurality of screws (7) are screwed to the screw holes (22), the end portion (71) of the screw (7) is in contact with the elastic member (4), and the thickness of the elastic member (4) (H) It is 1/2 of the depth (T) of the groove (32), thereby limiting the rotation of the wiper (3) and the degree of freedom in the axial direction.
In view of the above, the "industry availability" of this creation should be unquestionable. In addition, the characteristic techniques revealed in the examples in this case have not been seen in publications before, and have not been disclosed. The use, not only has the fact that the effect is improved as described above, but also has additional functions that cannot be neglected. Therefore, the "novelty" and "progressiveness" of the creation have been in compliance with the patent regulations, and the application for creating a patent is proposed 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 illustrate the present invention and is not intended to limit the present invention. Therefore, variations of numerical values and substitution of equivalent elements are still within the scope of the present invention.

1‧‧‧ screw

11‧‧‧ rolling groove

2‧‧‧ nuts

21‧‧‧through hole

211‧‧‧ rolling groove

22‧‧‧ screw holes

23‧‧‧Installation slot

3‧‧‧Scratch

31‧‧‧Lip

32‧‧‧ Groove

4‧‧‧Flexible parts

5‧‧‧ rolling elements

7‧‧‧ screws

71‧‧‧End

X‧‧‧axis direction

Claims (2)

A ball screw with a scraper, comprising: a screw, which is elongated into a long strip structure in one direction, defines the direction of elongation as an axial direction, and the outer peripheral surface of the screw is provided with a spiral rolling groove; a nut The through hole has a through hole for the screw sleeve, and the inner edge surface of the through hole is provided with a rolling groove opposite to the rolling groove, and the rolling groove and the rolling groove form a load path, and the two ends of the through hole are respectively The utility model is provided with a mounting groove, the outer edge surface of the nut penetrating through a plurality of screw holes communicating with the mounting groove; a plurality of rolling systems are disposed on the load path; the two scrapers are respectively disposed on the two mounting grooves, the scraping brush The device has an annular structure, and has a lip corresponding to the rolling groove on the inner ring surface, and an annular groove on the outer ring surface, wherein the groove is provided with an elastic member; the plurality of screws are arranged on the screw hole The end of the screw is in contact with the elastic member, thereby limiting the rotation of the wiper and the degree of freedom in the axial direction. The ball screw with a wiper according to claim 1, wherein the thickness of the elastic member is 1/2 of the depth of the groove.