Multi-layer sharp corner limiting type sealing ring

Abstract

The utility model relates to the technical field of sealing rings, and discloses a multilayer sharp corner limiting type sealing ring. The multilayer sharp corner limiting type sealing ring is provided with a sealing ring body, a sealing pressing plate is integrally formed at one end of the sealing ring body, and the outer diameter of the sealing pressing plate is larger than that of the sealing ring body; a limiting bulge is arranged at the other end of the sealing ring main body and is correspondingly matched and assembled with the lead screw nut mounting groove; a plurality of layers of contact convex rings are arranged on the inner ring of the sealing ring body, and sharp corner structures in linear contact with a lead screw shaft are arranged on the inner rings of the contact convex rings. The contact convex ring comprises a small-width arc part and a large-width arc part, and a transition section arc part is connected between the small-width arc part and the large-width arc part; and the plurality of layers of contact convex rings are distributed in a spatial staggered manner. The structure is simple, the limiting protrusion and the lead screw nut installation groove are assembled in a corresponding and matched mode, installation is convenient, and radial movement is prevented; the contact convex ring is in linear contact with the lead screw shaft, so that the contact area can be reduced, and heat is reduced; meanwhile, external fine impurities are prevented from entering the nut.

Description

Technical Field

[0001] This utility model relates to the field of sealing ring technology, and in particular to a multi-layer sharp-corner limiting sealing ring for ball screw sealing. Background Technology

[0002] With the advancement and development of industry, the demand for high-precision, well-sealed, low-noise, compact, high-load-bearing, and maintenance-free ball screws in domestic industrial equipment is increasing. In the field of precision machining, due to the high requirements for machining accuracy, the precision requirements for machining process control and the transmission of machining equipment, there are requirements for the dustproof performance and operational stability of ball screws. Both dustproof performance and operational stability involve the issue of screw sealing.

[0003] In existing technologies, to improve sealing performance, ball screw seals employ either gap sealing or contact sealing methods. Gap sealing uses a non-contact labyrinth seal, utilizing a spring clip to hold the sealing ring in place; contact sealing primarily uses a diaphragm seal, employing a sealing plate and screws to hold the sealing ring in place. The former has a gap between the sealing ring and the contact area with the screw shaft, making it prone to radial movement, allowing fine external particles to easily enter the screw, resulting in limited sealing effectiveness. The latter, due to its thinner and softer material, is prone to misalignment during installation in the raceway, causing radial movement, and its thinner thickness also limits its ability to block fine impurities.

[0004] Existing sealing technologies offer a wide variety of methods. When sealing is required, most employ a separate sealing ring and sealing plate design. However, due to the lack of a defined radial positioning shape, this method is difficult to install or prone to inaccurate positioning, leading to installation deviations, radial movement, and consequently, poor operation and suboptimal sealing performance. In applications with fine impurities or suspended dust, the labyrinth seal has a very small gap between itself and the lead screw shaft groove, resulting in limited dustproof performance and grease leakage. Assembly errors can easily lead to contact between the seal and the groove. Because the labyrinth seal has a large contact area, this increases torque and heat generation, further reducing sealing performance.

[0005] The thinner, less rigid, and inaccurately installed split-type sealing rings result in a larger contact area and increased friction at the sealing contact points. Installation deviations lead to increased operating torque, heat generation, and reduced sealing performance. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a multi-layered pointed corner limiting sealing ring that is easy to install and has good sealing performance.

[0007] The technical solution adopted by this utility model to solve its technical problem is:

[0008] A multi-layered pointed corner limiting seal ring is used for sealing a ball screw assembly. The ball screw assembly includes a screw shaft and a screw nut, and has a seal ring body sleeved on the screw shaft. One end of the seal ring body is integrally formed with a sealing pressure plate, the outer diameter of which is larger than the outer diameter of the seal ring body. The other end of the seal ring body is provided with a limiting protrusion, which is assembled with the screw nut mounting groove.

[0009] The inner ring of the sealing ring body has several layers of contact protrusions, and the inner ring of the contact protrusions has a pointed structure that forms line contact with the lead screw shaft. Each contact protrusion includes a narrow-width arc portion and a wide-width arc portion, connected by a transition arc portion. The layers of contact protrusions are spatially staggered. The narrow-width arc portion contacts the outer diameter line of the lead screw shaft, the wide-width arc portion contacts the lead screw shaft groove line, and the two ends of the narrow-width arc portion are connected to transition arc portions, which in turn connect to the wide arc portions. To match the helical structure of the lead screw shaft groove, the layers of contact protrusions form a helical spatial staggered distribution.

[0010] Furthermore, the longitudinal section of the pointed structure is V-shaped.

[0011] Furthermore, the longitudinal section of the pointed structure includes two intersecting inclined surfaces, and the intersection of the two inclined surfaces forms a rounded corner.

[0012] Furthermore, the longitudinal section of the pointed structure has a vertical surface and an inclined surface, and the intersection of the vertical surface and the inclined surface forms a pointed corner.

[0013] Furthermore, the longitudinal section of the pointed structure has a vertical surface and an inclined surface, and the intersection of the vertical surface and the inclined surface forms a rounded corner.

[0014] Furthermore, the number of contact protrusions is 3 to 5 layers, and the number of contact protrusions increases with the thickness of the sealing ring.

[0015] Furthermore, the narrow arc portion is a 1 / 3 circle arc portion, which is set to 1 / 3 circle to facilitate matching with the outer diameter of the lead screw shaft.

[0016] Furthermore, the limiting protrusion is an arc-shaped protrusion with a thickness that gradually increases from one end to the other. The screw nut mounting groove is correspondingly provided with the arc-shaped protrusion, which facilitates the rotational installation of the limiting protrusion and the screw nut mounting groove.

[0017] Furthermore, the arc-shaped protrusion is an arc-shaped protrusion with a radius of 1 / 2 circle.

[0018] Furthermore, the limiting protrusion is an annular protrusion, and the outer circumference of the annular protrusion is provided with an external thread that corresponds to and mates with the screw nut mounting groove.

[0019] Furthermore, the sealing plate is provided with several screw holes to facilitate the assembly of the sealing ring and the lead screw nut.

[0020] Furthermore, the main body of the sealing ring is a polytetrafluoroethylene (PTFE) sealing ring, which has a low coefficient of friction and high wear resistance, minimizing heat and friction, and ensuring dustproof performance and stable operation.

[0021] Furthermore, the sealing plate is a metal plate, which provides rigid support for the sealing ring.

[0022] The beneficial effects of this utility model are as follows: This utility model has a simple structure and reasonable design, and has the following advantages:

[0023] (1) The other end of the sealing ring body is provided with a limiting protrusion. The limiting protrusion is assembled with the screw nut mounting groove to radially limit the assembly of the sealing ring, which improves the problem of poor sealing effect caused by radial movement of the sealing ring during installation or operation when it is in a gap or contact state.

[0024] (2) The inner ring of the sealing ring body is provided with several layers of contact convex rings. The inner ring of the contact convex ring is provided with a sharp corner structure that forms a line contact with the lead screw shaft. The several layers of contact convex rings are spatially staggered. Compared with traditional contact seals, line contact can reduce the contact area and reduce heat generation. From the perspective of force, the multi-layer sharp corner tooth structure is adopted. Although fine substances enter the nut at a certain speed, they will be blocked multiple times and eventually blocked to the outside. The sealing ring of this utility model more effectively restricts the entry of fine impurities from the outside into the nut, and the sealing effect is better. It effectively reduces the probability of impurities affecting the stability of the ball screw, the service life and the generation of operating noise.

[0025] (3) Compared with flat sealing rings, the sealing ring of this utility model has a lower probability of side leakage and impurity entry during high-speed operation, and the sealing effect is better; the sealing ring of this utility model is suitable for both contact sealing and gap sealing.

[0026] (4) The sealing ring body and the sealing pressure plate are integrated into one structure. Compared with the split sealing ring, the number of sealing components and the sealing assembly time are reduced. In addition, the sealing is fixed with screws and lead screw nuts, resulting in higher sealing and fixing strength. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a perspective view of the sealing ring in Example 1;

[0029] Figure 2 yes Figure 1 The main view;

[0030] Figure 3 yes Figure 2 Rear view;

[0031] Figure 4 yes Figure 2 Sectional view along the middle AA direction;

[0032] Figure 5 This is a schematic diagram of the structure of a single contact protrusion ring in Example 1;

[0033] Figure 6 This is a schematic diagram of the three-layer contact convex ring structure in Example 1;

[0034] Figure 7 This is a cross-sectional view of the contact convex ring in Embodiment 1;

[0035] Figure 8 This is a schematic diagram of the installation of the sealing ring in this utility model.

[0036] Figure 9 This is a perspective view of the sealing ring in Example 2;

[0037] Figure 10 yes Figure 9 Main view;

[0038] Figure 11 This is a cross-sectional view of the contact convex ring in Embodiment 3;

[0039] Figure 12 This is a cross-sectional view of the contact convex ring in Example 4;

[0040] Figure 13 This is a cross-sectional view of the contact protrusion ring in Example 5.

[0041] In the diagram: 100. Sealing ring, 200. Lead screw shaft, 300. Lead screw nut;

[0042] 1. Sealing ring body, 2. Sealing pressure plate, 3. Arc-shaped protrusion, 4. Annular protrusion, 5. Contact protrusion, 6. Screw hole, 51. Small-width arc section, 52. Transition arc section, 53. Large-width arc section. Detailed Implementation

[0043] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application. As used herein, the singular form includes the plural form unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this description, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0046] Example 1

[0047] like Figures 1-5 The diagram shows a multi-layered pointed corner limiting seal ring used for sealing a ball screw assembly. The ball screw assembly includes a screw shaft 200 and a screw nut 300. It has a seal ring body 1 sleeved on the screw shaft 200. One end of the seal ring body 1 is injection molded with a sealing pressure plate 2, the outer diameter of which is larger than the outer diameter of the seal ring body 1. The other end of the seal ring body 1 is provided with a limiting protrusion, which is assembled in accordance with the mounting groove of the screw nut 300.

[0048] The inner ring of the sealing ring body 1 is provided with three layers of contact convex rings 5. The inner ring of the contact convex ring 5 is provided with a sharp corner structure that forms line contact with the lead screw shaft 200. The contact convex ring 5 includes a small-width arc portion 51 and a large-width arc portion 53. A transition section arc portion 52 connects the small-width arc portion 51 and the large-width arc portion 53. Several layers of contact convex rings 5 ​​are spatially staggered.

[0049] To complement the helical structure of the lead screw shaft channel, three layers of contact convex rings are arranged in a spatially staggered helical pattern. Specifically: [Example...] Figure 6 As shown, in this embodiment, the three-layer contact convex ring 5 has line A as the central axis of the sealing ring body 1, and line B is set parallel to line A. Based on line B, the small-width arc portion 51 on the pressure plate side, the arc portion 52 on the middle transition section, and the large-width arc portion 53 on the convex side are correspondingly set.

[0050] like Figure 7 As shown, the longitudinal section of the pointed structure in this embodiment is V-shaped, which facilitates line contact with the lead screw shaft 200.

[0051] The narrow-width arc portion 51 is an arc portion that is 1 / 3 of a circle.

[0052] The limiting protrusion is an annular protrusion 4, and the outer circumference of the annular protrusion 4 is provided with an external thread that corresponds to the mounting groove of the lead screw nut 300.

[0053] The sealing plate 2 has several screw holes 6 for easy assembly of the sealing ring and the lead screw nut 300.

[0054] The sealing ring body 1 is a polytetrafluoroethylene sealing ring.

[0055] Sealing plate 2 is a metal plate.

[0056] like Figure 8 As shown, rotating the sealing ring 100, with the annular convex ring 4 threadedly engaged with the mounting groove of the lead screw nut 300, allows the sealing ring 100 to be installed at both ends of the lead screw nut 300. The contact convex ring 5 of the inner ring of the sealing ring body 1 abuts against the lead screw shaft 200. The sealing ring 100 and the end face of the lead screw nut 300 are tightly fitted, resulting in a smooth surface and a more aesthetically pleasing appearance.

[0057] Example 2

[0058] like Figure 9 and Figure 10 As shown, the difference from Embodiment 1 is that the limiting protrusion in this embodiment is an arc-shaped protrusion 3. The thickness of the arc-shaped protrusion 3 gradually increases from one end to the other end. The mounting groove of the lead screw nut 300 cooperates with the arc-shaped protrusion 3. The arc-shaped protrusion 3 is an arc-shaped protrusion with a 1 / 2 circle.

[0059] Example 3

[0060] like Figure 11 As shown, the difference from Embodiment 1 is that the longitudinal section of the sharp-cornered structure in this embodiment includes two intersecting inclined surfaces, and the intersection of the two inclined surfaces forms a rounded corner.

[0061] Example 4

[0062] like Figure 12 As shown, the difference from Embodiment 1 is that the longitudinal section of the sharp corner structure in this embodiment has a vertical surface and an inclined surface, and the intersection of the vertical surface and the inclined surface forms a sharp corner.

[0063] Example 5

[0064] like Figure 13 As shown, the difference from Embodiment 1 is that the longitudinal section of the pointed corner structure in this embodiment has a vertical surface and an inclined surface, and the intersection of the vertical surface and the inclined surface forms a rounded corner.

[0065] In summary, this utility model has a simple structure and reasonable design, and has the following advantages:

[0066] (1) The other end of the sealing ring body 1 is provided with a limiting protrusion. The limiting protrusion is assembled with the mounting groove of the screw nut 300 to radially limit the assembly of the sealing ring 100, which improves the problem of poor sealing effect caused by radial movement during the installation or operation of the sealing ring when it is in a gap or contact.

[0067] (2) The inner ring of the sealing ring body 1 is provided with several layers of contact convex rings 5. The inner ring of the contact convex ring 5 is provided with a sharp corner structure that forms a line contact with the lead screw shaft 200. The several layers of contact convex rings 5 ​​are spatially staggered. Compared with traditional contact seals, line contact can reduce the contact area and reduce heat generation. From the perspective of force, the multi-layer sharp corner structure can prevent fine substances from entering the nut at a certain speed. However, it will be blocked multiple times and eventually blocked from the outside. The sealing ring of this utility model can more effectively restrict the entry of fine impurities from the outside into the nut. The sealing effect is better and the probability of impurities affecting the stability of the ball screw, the service life and the generation of operating noise is effectively reduced.

[0068] (3) Compared with flat sealing rings, the sealing ring of this utility model has a lower probability of side leakage and impurity entry during high-speed operation, and the sealing effect is better; the sealing ring of this utility model is suitable for both contact sealing and gap sealing.

[0069] (4) The sealing ring body 1 and the sealing pressure plate 2 are integrated into one structure. Compared with the split sealing ring, the number of sealing components and the sealing assembly time are reduced. In addition, the screws 6 and the lead screw nut 300 are used for fixing, which results in higher sealing and fixing strength.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multi-layered, pointed-corner limiting seal ring for sealing a ball screw assembly, the ball screw assembly comprising a screw shaft (200) and a screw nut (300), characterized in that: It has a sealing ring body (1) sleeved on the lead screw shaft (200), and a sealing pressure plate (2) integrally formed at one end of the sealing ring body (1). The outer diameter of the sealing pressure plate (2) is larger than the outer diameter of the sealing ring body (1). The other end of the sealing ring body (1) is provided with a limiting protrusion, which is assembled with the mounting groove of the lead screw nut (300). The inner ring of the sealing ring body (1) is provided with several layers of contact convex rings (5), and the inner ring of the contact convex ring (5) is provided with a sharp corner structure that forms a line contact with the lead screw shaft (200); the contact convex ring (5) includes a small-width arc portion (51) and a large-width arc portion (53), and a transition arc portion (52) connects the small-width arc portion (51) and the large-width arc portion (53); the several layers of contact convex rings (5) are spatially staggered.

2. The multi-layered pointed-corner limiting sealing ring according to claim 1, characterized in that: The longitudinal section of the pointed structure is V-shaped.

3. The multi-layered pointed-corner limiting sealing ring according to claim 1, characterized in that: The longitudinal section of the pointed structure includes two intersecting inclined surfaces, and the intersection of the two inclined surfaces forms a rounded corner.

4. The multi-layered pointed-corner limiting sealing ring according to claim 1, characterized in that: The longitudinal section of the pointed structure has a vertical surface and an inclined surface, and the intersection of the vertical surface and the inclined surface forms a pointed corner.

5. The multi-layered pointed-corner limiting sealing ring according to claim 1, characterized in that: The longitudinal section of the pointed structure has a vertical surface and an inclined surface, and the intersection of the vertical surface and the inclined surface forms a rounded corner.

6. The multi-layered pointed-corner limiting sealing ring according to claim 1, characterized in that: The number of contact protrusions (5) is 3 to 5 layers.

7. The multi-layered pointed-corner limiting sealing ring according to claim 1, characterized in that: The narrow arc portion (51) is an arc portion that is 1 / 3 of a circle.

8. The multi-layered pointed-corner limiting sealing ring according to claim 1, characterized in that: The limiting protrusion is an arc-shaped protrusion (3), and the thickness of the arc-shaped protrusion (3) gradually increases from one end to the other end.

9. The multi-layered pointed-corner limiting sealing ring according to claim 8, characterized in that: The arc-shaped protrusion (3) is an arc-shaped protrusion with a radius of 1 / 2 circle.

10. The multi-layered pointed-corner limiting sealing ring according to claim 1, characterized in that: The limiting protrusion is an annular protrusion (4), and the outer circumference of the annular protrusion (4) is provided with an external thread that corresponds to the mounting groove of the lead screw nut (300).

11. The multi-layered pointed-corner limiting sealing ring according to claim 1, characterized in that: The sealing plate (2) has several screw holes (6) for easy assembly of the sealing ring and the lead screw nut (300).

12. The multi-layered pointed-corner limiting sealing ring according to claim 1, characterized in that: The sealing ring body (1) is a polytetrafluoroethylene sealing ring.

13. The multi-layered pointed-corner limiting sealing ring according to claim 1, characterized in that: The sealing plate (2) is a metal plate.

Images