Scraper and ball screw equipped with same

Abstract

The invention discloses a scraping and brushing device which comprises a first component and a second component. The first component is in a ring shape and comprises a first end face part, a second end face part, an inner ring part and an outer ring part, wherein the inner ring part and the outer ring part are defined by the first end face part and the second end face part. The second component is annular and comprises a third end face part, a fourth end face part, an inner ring part and an outer ring part, wherein the inner ring part and the outer ring part are defined by the third end face part and the fourth end face part. Wherein the first component and the second component can be mutually embedded into a whole to form the scraping and brushing device. After embedding, the inner ring part of the first component is embedded with the inner ring part of the second component, the outer ring part of the second component covers the outer ring part of the first component, the first end face part is aligned with the third end face part, and the second end face part is aligned with the fourth end face part. Therefore, the modular assembly effect is achieved.

Description

Technical Field

[0001] The present invention relates to a wiper; more particularly, it relates to a ball screw equipped with a wiper. Background Art

[0002] Ball screws are often seen in mechanical transmission devices and are mainly used to convert rotational motion into linear motion. A ball screw basically consists of components such as a screw, balls, ball guides, and a nut. The working principle of a ball screw is to achieve rolling motion through the radial contact of the balls between the screw and the nut, thereby converting rotational motion into linear motion. The structure of the ball screw enables the balls to be evenly distributed on the radial ball guides of the nut, reducing the contact pressure between the balls and the radial ball guides and reducing the rolling resistance of the balls, thereby improving the transmission efficiency.

[0003] In addition, ball screws have the advantage of high rigidity. The structural design of the ball screw enables the balls to be evenly distributed on the radial ball guides of the screw, thereby increasing the contact area between the balls and the radial ball guides, improving the rigidity of the transmission system, and enabling the ball screw to withstand greater loads during operation. Therefore, ball screws are particularly suitable for applications that require high loads and high rigidity, such as cutting loads in machine tool machining, heavy-duty movements in robots, etc. Moreover, ball screws have high precision, enabling high-speed and high-precision motion control in many applications, and are therefore widely used in machine tools, automation equipment, precision measuring instruments, and semiconductor equipment, etc.

[0004] In the above-mentioned ball screw, the smoothness and accuracy of the relative movement of the nut along the axial direction of the screw are significantly affected by the easy entry of external dirt or metal debris into the gap between the two. Therefore, wipers are often provided at the front and rear ends of the nut to provide a wiping ability through the wipers to keep the surface of the screw shaft clean and improve the product accuracy and service life.

[0005] Previously, various wiper structures have been proposed. Due to its complex structure, the single-piece wiper has a high manufacturing cost, and thus the multi-piece assembled wiper has been developed. However, the multi-piece assembled wiper still has its defects. For example, its assembled form is unstable, prone to vibration or loosening, thereby affecting the normal operation of the wiper and reducing the service life. Moreover, the overly complex assembly structure will cause difficulties in disassembly or maintenance in the future. Accordingly, further improvement of the wiper for the ball screw is still required. Summary of the Invention

[0006] The present invention provides a wiper and a ball screw equipped with a wiper. The wiper is formed by two components being mutually embedded into one body, having convenience during assembly, and also having the characteristics of stable assembly, thin and light volume, reduced part interference, and wide applicability.

[0007] On the one hand, the present invention provides a wiper, which includes a first member and a second member. The first member is annular, including a first end face portion, a second end face portion, an inner ring portion and an outer ring portion defined by the first end face portion and the second end face portion. The second member is annular, including a third end face portion, a fourth end face portion, an inner ring portion and an outer ring portion defined by the third end face portion and the fourth end face portion. Wherein, the first member and the second member can be mutually engaged to form a wiper integrally. After the engagement, the inner ring portion of the first member is engaged with the inner ring portion of the second member, the outer ring portion of the second member covers the outer ring portion of the first member, the first end face portion is aligned with the third end face portion, and the second end face portion is aligned with the fourth end face portion.

[0008] In one example, the hardness of the first member can be less than the hardness of the second member.

[0009] In one example, the first member includes a plastic material.

[0010] In one example, the second member includes a metal material.

[0011] In one example, a plurality of engaging blocks are provided on the first end face portion of the first member, and a plurality of engaging holes are provided on the second end face portion of the first member.

[0012] In one example, a plurality of engaging holes are provided on the third end face portion of the second member, a plurality of engaging blocks are provided on the fourth end face portion of the second member, the positions of the engaging holes of the second member correspond to the positions of the engaging blocks of the first member and can be mutually engaged, and the positions of the engaging blocks of the second member correspond to the positions of the engaging holes of the first member and can be mutually engaged.

[0013] In one example, each of the first end face portion and the second end face portion of the first member includes a wiper structure.

[0014] On the one hand, the present invention provides a ball screw equipped with the above wiper, which includes a nut, a screw rod, a plurality of balls and at least one wiper. The nut is in a hollow body shape, and a plurality of threads are provided on the inner side. One side of the nut penetrates through a hollow channel. Both ends of the hollow channel each include an opening. The screw rod is inserted into the nut, and a plurality of threads corresponding to the positions of the threads of the nut are provided on the outer side, and a ball track is formed by the threads on the outer side of the screw rod and the threads on the inner side of the nut. A plurality of balls are rotatably arranged between the threads on the inner side of the nut and the threads on the outer side of the screw rod. The balls form a reflux circulation path through the opening at one end of the hollow channel, the ball track, and the opening at the other end of the hollow channel. Through the rolling reflux of the balls, the nut is driven to perform a linear motion relative to the screw rod. At least one wiper is engaged at one end of the nut, and the wiper structure of the wiper contacts the ball track when the balls circulate and reflux.

[0015] In one example, the ball screw further includes a sleeve cover. The wiper is fitted into the sleeve cover and is embedded in the inner side of one end of the nut through the sleeve cover. Description of the Drawings

[0016] Figure 1 FIG. is a schematic structural diagram of a wiper according to an embodiment;

[0017] Figure 2 FIG. shows Figure 1 another perspective of the wiper;

[0018] Figure 3 FIG. shows Figure 1 an exploded view of the wiper;

[0019] Figure 4 FIG. shows Figure 1 an exploded view of another perspective of the wiper;

[0020] Figure 5 FIG. is a schematic structural diagram of a ball screw according to an embodiment;

[0021] Figure 6 FIG. shows Figure 5 an exploded view of the ball screw;

[0022] Figure 7 FIG. shows Figure 5 a cross-sectional view of the ball screw.

[0023] Symbol Description:

[0024] Wiper 100

[0025] First member 110

[0026] First end face portion 111

[0027] Second end face portion 112

[0028] Inner ring portion 113

[0029] Outer ring portion 114

[0030] Insert block 115

[0031] Insert hole 116

[0032] Wiper structure 117

[0033] Second member 120

[0034] Third end face portion 121

[0035] Fourth end face portion 122

[0036] Inner ring portion 123

[0037] Outer ring portion 124

[0038] Insert block 125

[0039] Insertion hole 126

[0040] Ball screw 200

[0041] Nut 210

[0042] Thread 211

[0043] Hollow channel 212

[0044] Opening 212a

[0045] Screw rod 220

[0046] Thread 221

[0047] Ball 230

[0048] Cover 240

[0049] Ball track 250 Specific embodiments

[0050] Multiple embodiments of the present invention will be described below with reference to the drawings. For the sake of clarity, many practical details will be described together in the following description. However, it should be understood that these practical details are not used to limit the present invention. That is to say, in some embodiments of the present invention, these practical details are not necessary. In addition, to simplify the drawings and focus on the main technical features of the present case, some existing conventional and unnecessary structures and components will be shown in the drawings in a simple schematic manner or omitted.

[0051] In the present invention, the terms "first", "second", "upper", "lower", and "between" describe a relative position. In fact, due to the actual situation, it does not exclude the possibility of a change in the arrangement order. When the perspective is different, the relative position relationship of "first", "second", "upper", and "lower" may also change correspondingly.

[0052] Refer to together Figure 1 , Figure 2 , Figure 3 and Figure 4 . Figure 1 FIG. is a schematic structural diagram of a wiper 100 according to an embodiment. Figure 2 For showing Figure 1 Another perspective of the wiper 100. Figure 3 For showing Figure 1 Exploded view of the wiper 100. Figure 4 For showing Figure 1 Exploded view of another perspective of the wiper 100.

[0053] The wiper 100 includes a first member 110 and a second member 120.

[0054] The first member 110 is annular, including a first end face portion 111, a second end face portion 112, an inner ring portion 113 and an outer ring portion 114 defined by the first end face portion 111 and the second end face portion 112.

[0055] The second member 120 is annular, including a third end face portion 121, a fourth end face portion 122, an inner ring portion 123 and an outer ring portion 124 defined by the third end face portion 121 and the fourth end face portion 122.

[0056] The first member 110 and the second member 120 can be mutually engaged to form the overall structure of the wiper 100. In other words, the wiper 100 is formed by fitting two parts together as one. The first end face portion 111 and the second end face portion 112 of the first member 110 each include a wiper structure 117. The wiper structure 117 is used to scrape off dust or impurity particles.

[0057] To fit the first member 110 and the second member 120 together, a plurality of engaging blocks 115 are provided on the first end face portion 111 of the first member 110, and a plurality of engaging holes 116 are provided on the second end face portion 112 of the first member 110. A plurality of engaging holes 126 are provided on the third end face portion 121 of the second member 120, and a plurality of engaging blocks 125 are provided on the fourth end face portion 122 of the second member 120. The positions of the engaging holes 126 of the second member 120 correspond to the positions of the engaging blocks 115 of the first member 110 and can be mutually engaged. The positions of the engaging blocks 125 of the second member 120 correspond to the positions of the engaging holes 116 of the first member 110 and can be mutually engaged.

[0058] After the engagement, the inner ring portion 113 of the first member 110 is engaged with the inner ring portion 123 of the second member 120, the outer ring portion 124 of the second member 120 covers the outer ring portion 114 of the first member 110, the first end face portion 111 is aligned with the third end face portion 121, and the second end face portion 122 is aligned with the fourth end face portion 122. Thereby, a three-dimensional annular wiper 100 is formed. It can be seen therefrom that the annular structure of the second member 120 is slightly larger than the annular structure of the first member 110, so that the first member 110 is embedded in the second member 120 to form an integral annular structure of the wiper 100.

[0059] In one embodiment, the hardness of the first member 110 may be less than the hardness of the second member 120. For example, the first member 110 may be made of plastic, and the second member 120 may be made of metal. Through the second member 120 with higher hardness, the wiper 100 can be stabilized after installation. Through the first member 110 with lower hardness, the material hardness of the first member 110 can match the screw assembly assembled with the wiper 100, increasing the assembly accuracy, reducing the assembly interference, and improving the effect of brushing and removing dust chips.

[0060] Refer to Figure 5 , Figure 6 and Figure 7 . Figure 5 FIG. is a schematic structural diagram of a ball screw 200 according to an embodiment. Figure 6 For showing Figure 5 exploded view of the ball screw 200 of Figure 7 For showing Figure 5 cross-sectional view of the ball screw 200 of

[0061] The ball screw 200 assembled with the wiper 100 as described above includes a nut 210, a screw 220, a plurality of balls 230, and at least one wiper 100.

[0062] The nut 210 is in a hollow body shape. A plurality of threads 211 are provided inside the nut 210. One side of the nut 210 penetrates a hollow channel 212. Both ends of the hollow channel 212 each include an opening 212a.

[0063] The screw 220 is inserted into the nut 210. A plurality of threads 221 corresponding to the positions of the plurality of threads 211 of the nut 210 are included on the outer side of the screw 220, and a ball track 250 is formed by the plurality of threads 221 on the outer side of the screw 220 and the plurality of threads 211 inside the nut 210.

[0064] A plurality of balls 230 are rotatably disposed between the plurality of threads 211 inside the nut 210 and the plurality of threads 221 on the outer side of the screw 220. The plurality of balls 230 form a reflux circulation path through the opening 212a at one end of the hollow channel 212, the ball track 250, and the opening 212a at the other end of the hollow channel 212. Through the rolling reflux of the plurality of balls 230, the nut 210 can be driven to perform a linear motion relative to the screw 220, achieving a linear transmission effect.

[0065] The wiper 100 is fitted at one end of the nut 210. Through the wiper structure 117 of the wiper 100, it can contact the ball track 250 when these balls 230 circulate and flow back, thereby scraping off dust debris or impurity particles that enter the ball track 250 from the outside or when the nut 210 moves. Two wipers 100 can also be respectively fitted at two ends of the nut 210 to achieve a better dust removal effect. As described above, the wiper structure 117 of the first component 100 of the wiper 100 uses a plastic soft material and is in a tooth-like shape, which can achieve a wiper-like effect and has a good foreign object removal effect.

[0066] To assemble the wiper 100 on the ball screw 200, in addition to directly fitting the aforesaid wiper 100 inside one end of the nut 210 of the ball screw 200, in another embodiment, a socket 240 can be used. The wiper 100 can be fitted into the socket 240 and then fitted inside one end of the nut 210 through the socket 240. Through the socket 240, it helps to position the wiper 100 and assist in firmly fixing the wiper 100 on the nut 210.

[0067] In summary, the benefits of the present invention are as follows:

[0068] 1. The present invention uses two-piece components to be mutually fitted to form the wiper 100, which is easy to assemble, has a modular assembly effect, and is beneficial to the assembly of the overall ball screw 200 assembly and subsequent maintenance.

[0069] 2. The material combination of the two-piece component can be made of metal material or plastic material, and adopts a combination form of hard outside and soft inside (the hardness of the second component 120 is greater than that of the first component 110). Its structure can be adjusted and assembled according to different forms, and the outer contour of each component corresponds to the inner contour of the nut 210. The formed wiper 100 has the advantages of high assembly stability, wide application range, low manufacturing cost, light weight, high tightness, and reduced interference.

[0070] Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Any person skilled in this art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to that defined by the appended claims.

Claims

1. A wiper, characterized in that, Comprising: A first member, which is annular and includes a first end face portion, a second end face portion, an inner ring portion and an outer ring portion defined by the first end face portion and the second end face portion; and A second member, which is annular and includes a third end face portion, a fourth end face portion, an inner ring portion and an outer ring portion defined by the third end face portion and the fourth end face portion; Wherein, the first member and the second member can be mutually engaged to form the wiper integrally. After the engagement, the inner ring portion of the first member is engaged with the inner ring portion of the second member, the outer ring portion of the second member covers the outer ring portion of the first member, the first end face portion is aligned with the third end face portion, and the second end face portion is aligned with the fourth end face portion.

2. The wiper according to claim 1, characterized in that, The hardness of the first member is less than the hardness of the second member.

3. The wiper according to claim 2, characterized in that, The first member includes a plastic material.

4. The wiper according to claim 2, wherein, The second member includes a metal material.

5. The wiper according to claim 1, characterized in that, A plurality of engaging blocks are provided on the first end face portion of the first member, and a plurality of engaging holes are provided on the second end face portion of the first member.

6. The wiper according to claim 5, characterized in that, A plurality of engaging holes are provided on the third end face portion of the second member, and a plurality of engaging blocks are provided on the fourth end face portion of the second member. The positions of the engaging holes of the second member correspond to the positions of the engaging blocks of the first member and can be mutually engaged, and the positions of the engaging blocks of the second member correspond to the positions of the engaging holes of the first member and can be mutually engaged.

7. The wiper according to claim 1, characterized in that, The first end face portion and the second end face portion of the first member each include a wiper structure.

8. A ball screw equipped with the wiper as described in claim 1, characterized in that, Comprising: A nut, which is in a hollow body shape. A plurality of threads are provided inside the nut. One side of the nut penetrates a hollow channel, and each end of the hollow channel includes an opening; A screw rod, which is inserted into the nut. A plurality of threads corresponding to the positions of the threads inside the nut are provided on the outer side of the screw rod, and a ball track is formed by the threads on the outer side of the screw rod and the threads inside the nut; A plurality of balls, which are rollably arranged between the threads inside the nut and the threads on the outer side of the screw rod. The balls form a reflux circulation path through the opening at one end of the hollow channel, the ball track, and the opening at the other end of the hollow channel. The relative linear movement of the nut with respect to the screw rod is driven by the rolling reflux of the balls; and At least one of the wipers is engaged at one end of the nut, and the wiper structure of the wiper contacts the ball track when the balls circulate and reflux.

9. The ball screw according to claim 8, wherein, It further includes a cover. The wiper is engaged with the cover and is embedded inside one end of the nut through the cover.

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