A high-sealing close-contact type rubber seal ring of a ball screw pair

Abstract

The utility model discloses a high sealing close type rubber sealing ring of ball screw pair, including sealing ring, nut and ball screw, sealing ring is fixed in the both sides of nut, and sealing ring and nut are all threadedly sleeved on ball screw, the ball screw is threadedly opened ball race and positioning groove, and the ball race and positioning groove are sequentially interval distribution settings, sealing ring includes inner ring and outer ring framework, the inner ring inside is opened and is equipped with through -hole, the through -hole inside is equipped with first sealing lip and second sealing lip, the through -hole is equipped with the positioning lip between first sealing lip and second sealing lip, the positioning lip is engaged with positioning groove, the utility model discloses, has the characteristics such as good installation stability and good sealing.

Description

Technical Field

[0001] This utility model relates to the field of sealing ring technology, specifically a high-sealing, tight-fitting rubber sealing ring for ball screw assemblies. Background Technology

[0002] Ball screw assemblies are core components in the field of precision transmission. With their high transmission efficiency and precise positioning, they are widely used in CNC machine tools, automated equipment, precision instruments, and other applications requiring stringent operational stability. As a key protective component of the ball screw assembly, the sealing ring is installed on both sides of the nut. Its core function is to prevent external dust, debris, and other impurities from entering the meshing area between the screw and the nut, while also preventing internal grease leakage. Its sealing performance and installation stability directly determine the transmission accuracy and service life of the ball screw assembly.

[0003] A published Chinese patent, publication number CN211315015U, discloses a ball nut sealing ring, including a sealing ring body, a lead screw through hole, and a sealing ring tooth mechanism; the sealing ring tooth mechanism is disposed on the sealing ring body, and the lead screw through hole is opened at the center of the sealing ring body; the sealing ring tooth mechanism includes a first tooth and a second tooth, both of which are annular structures.

[0004] The sealing ring provided by this patent relies solely on the initial engagement between the locking teeth and the ball groove to achieve a basic seal. In actual installation, when the sealing ring is screwed into the mounting positions on both sides of the nut as the ball screw rotates, the radial limiting ability is insufficient due to the limited positioning achieved only through the ball groove, which easily leads to shaking and displacement. This instability during installation results in uneven contact pressure between the sealing ring and the screw surface, causing tiny gaps in the sealing ring and preventing a tight seal. This allows impurities to penetrate into the ball screw assembly, exacerbating wear on the balls and screw. Furthermore, the single ball groove engagement structure is insufficient to counteract the radial force during installation, which can easily lead to deformation of the sealing ring locking teeth after long-term use.

[0005] Therefore, it is essential to design a high-sealing, tight-fitting rubber seal ring for ball screw assemblies that offers good installation stability and sealing performance. Utility Model Content

[0006] The purpose of this invention is to provide a high-sealing, tight-fitting rubber sealing ring for ball screw assemblies to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a high-sealing tight-fitting rubber sealing ring for a ball screw pair, including a sealing ring, a nut and a ball screw, wherein the sealing ring is fixed on both sides of the nut, and both the sealing ring and the nut are threaded onto the ball screw; The ball screw has a ball groove and a positioning groove threaded on it. The ball groove and the positioning groove are arranged in sequence at intervals. The sealing ring includes an inner ring and an outer ring skeleton. The inner ring has a through hole. The through hole has a first sealing lip and a second sealing lip. The through hole has a positioning lip between the first sealing lip and the second sealing lip. The positioning lip engages with the positioning groove.

[0008] In one embodiment of the present invention, both the first sealing lip and the second sealing lip engage with the ball groove.

[0009] In one embodiment of this utility model, the outer ring skeleton is provided with a plurality of fixing grooves.

[0010] In one embodiment of this utility model, a plurality of the fixing grooves are symmetrically distributed around the ball screw, and when the sealing ring is screwed into both sides of the nut, the fixing grooves are aligned with the screw holes of the nut, and a screw is connected between the fixing grooves and the screw holes.

[0011] In one embodiment of the present invention, the first sealing lip, the second sealing lip, and the positioning lip are arranged in a continuous spiral shape inside the through hole.

[0012] In one embodiment of this utility model, both the inner ring and the outer ring skeleton are cylindrical structures, and the inner ring and the outer ring skeleton are made of nitrile rubber and cold-rolled steel plate, respectively.

[0013] Compared with the prior art, the beneficial effects achieved by this utility model are: (1) By setting a positioning lip that precisely engages with the positioning groove, a radial limiting structure is constructed between the sealing ring and the ball screw. The positioning lip is embedded in the positioning groove next to the ball groove, forming a combination of rigidity and elasticity. This can effectively limit the radial displacement and circumferential shaking of the sealing ring during the rotation and screwing into both sides of the nut. This solves the problem of inaccurate positioning caused by the traditional sealing ring relying solely on the elastic contact of the teeth. Furthermore, the precise limiting of the positioning lip ensures that the first and second sealing lips can always maintain a uniform contact pressure with the ball groove, avoiding excessive local compression and wear of the sealing lip due to the shaking of the sealing ring, thus shortening the service life of the sealing ring.

[0014] (2) By setting an outer ring skeleton and a fixing groove, when the sealing ring is screwed into both sides of the nut, the fixing groove and the nut screw hole are precisely aligned and fixed by screw connection, so as to achieve rigid fixation of the sealing ring and the nut, which further enhances the stability of the sealing ring during the rotation installation process. At the same time, the outer ring skeleton is made of cold-rolled steel plate, which improves the overall structural strength of the sealing ring and avoids sealing failure caused by deformation during long-term use. Attached Figure Description

[0015] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0016] Figure 1 This is a schematic diagram of the structural composition of this utility model.

[0017] Figure 2 This is a schematic diagram of the sealing ring structure of this utility model.

[0018] Figure 3 This is a cross-sectional view of the present invention.

[0019] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0020] In the diagram: 10, sealing ring; 11, inner ring; 111, through hole; 112, first sealing lip; 113, second sealing lip; 114, positioning lip; 12, outer ring skeleton; 121, fixing groove; 20, nut; 30, ball screw; 31, ball groove; 32, positioning groove; 40, screw. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0022] This utility model provides a technical solution: a high-sealing, tight-fitting rubber sealing ring for a ball screw assembly, comprising a sealing ring 10, a nut 20, and a ball screw 30. The sealing ring 10 is fixed on both sides of the nut 20, and both the sealing ring 10 and the nut 20 are threaded onto the ball screw 30. The ball screw 30 has a ball groove 31 and a positioning groove 32 threadedly formed, with the ball groove 31 and the positioning groove 32 arranged alternately. The sealing ring 10 includes an inner ring 11 and an outer ring skeleton 12. The inner ring 11 has a through hole 111 inside, and a first sealing lip 112 and a second sealing lip 113 are provided inside the through hole 111. The first sealing lip 112 and the second sealing lip 113 both engage with the ball groove 31. A positioning lip 1 is provided between the first sealing lip 112 and the second sealing lip 113 in the through hole 111. 14. The positioning lip 114 engages with the positioning groove 32; the positioning lip 114 and the positioning groove 32 on the ball screw 30 cooperate to provide a reliable radial limiting effect on the sealing ring 10, effectively constraining the displacement trajectory of the sealing ring 10 during the process of rotating and screwing into both sides of the nut 20 with the ball screw 30. This solves the problem of shaking and displacement that is prone to occur in traditional sealing rings due to the lack of a dedicated positioning structure. On the other hand, the fit between the first sealing lip 112 and the second sealing lip 113 and the ball groove 31, combined with the limiting effect of the positioning lip 114, ensures that the two sealing lips can always maintain a uniform and tight fit pressure with the ball groove 31, avoiding local poor fit or excessive wear of the sealing lips due to the shaking of the sealing ring 10. This significantly enhances the tightness of the sealing surface and effectively prevents external dust and impurities from entering the interior of the ball screw pair.

[0023] The outer ring frame 12 has multiple fixing grooves 121, which are symmetrically distributed around the ball screw 30. When the sealing ring 10 is screwed into both sides of the nut 20, the fixing grooves 121 are aligned with the screw holes of the nut 20, and screws 40 are connected between the fixing grooves 121 and the screw holes. The fixing grooves 121 on the outer ring frame 12, which are symmetrically distributed around the ball screw 30, can be precisely aligned with the screw holes of the nut 20 after the sealing ring 10 is screwed into both sides of the nut 20. The sealing ring 10 and the nut 20 are rigidly fixed by the connection of the screws 40, forming a reliable constraint in the axial direction. The symmetrically distributed fixing grooves 121 make the fixing force act evenly on the outer ring frame 12, ensuring that the sealing ring 10 is under overall force balance.

[0024] The first sealing lip 112, the second sealing lip 113, and the positioning lip 114 are arranged in a continuous spiral shape inside the through hole 111. The first sealing lip 112, the second sealing lip 113, and the positioning lip 114 adopt a continuous spiral design, which perfectly fits the ball groove 31 and the positioning groove 32 distributed in a thread on the ball screw 30, so that the lip structure and the thread trajectory of the ball screw 30 are highly adapted, further optimizing the synergistic effect of sealing and positioning. Both the inner ring 11 and the outer ring skeleton 12 are cylindrical structures, made of nitrile rubber and cold-rolled steel plate, respectively. The cylindrical structure of the inner ring 11 and the outer ring skeleton 12 not only perfectly matches the cylindrical mounting surfaces of the ball screw 30 and nut 20, ensuring the coaxiality of the overall assembly of the sealing ring 10, but also allows the inner ring 11, made of nitrile rubber, to tightly fit the first sealing lip 112, the second sealing lip 113, and the positioning lip 114 into the ball groove 31 and the positioning groove 32, compensating for minor vibrations during the operation of the screw through elastic deformation. The outer ring skeleton 12, made of cold-rolled steel plate, provides a stable support frame for the inner ring 11, ensuring the reliability of the connection between the sealing ring 10 and the nut 20.

[0025] Working principle: Initial assembly is achieved through the threaded engagement of the sealing ring 10 and the ball screw 30. Due to the continuous spiral design of the first sealing lip 112, the second sealing lip 113, and the positioning lip 114, they can smoothly screw into the ball screw 30 along the ball grooves 31 and positioning grooves 32 distributed on the thread. During this process, the positioning lip 114 embeds into the positioning groove 32 to form a radial limit, preventing the sealing ring 10 from shaking or shifting. Simultaneously, the first sealing lip 112 and the second sealing lip 113 simultaneously form a preliminary engagement with the ball grooves 31. When the sealing ring 10 is screwed to the preset installation positions on both sides of the nut 20, the fixing groove 121 on the outer ring frame 12 precisely aligns with the screw hole of the nut 20. The two are rigidly connected by the screw 40, completing the axial fixation. At this time, the sealing ring 10 maintains a stable assembly posture under the dual constraints of radial positioning and axial fixation.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or specific orientation structure and operation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0027] In the description of this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this utility model, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, those skilled in the art can combine different embodiments or examples and features of different embodiments or examples described in this utility model without contradiction.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-sealing tight-fitting rubber sealing ring for a ball screw assembly, comprising a sealing ring (10), a nut (20) and a ball screw (30), wherein the sealing ring (10) is fixed on both sides of the nut (20), and both the sealing ring (10) and the nut (20) are threaded onto the ball screw (30); Its features are: The ball screw (30) has a ball groove (31) and a positioning groove (32) threaded on it. The ball groove (31) and the positioning groove (32) are arranged in sequence at intervals. The sealing ring (10) includes an inner ring (11) and an outer ring skeleton (12). The inner ring (11) has a through hole (111) inside. The through hole (111) has a first sealing lip (112) and a second sealing lip (113) inside. The through hole (111) has a positioning lip (114) between the first sealing lip (112) and the second sealing lip (113). The positioning lip (114) engages with the positioning groove (32).

2. The high-sealing, tight-fitting rubber sealing ring for a ball screw assembly according to claim 1, characterized in that: The first sealing lip (112) and the second sealing lip (113) are engaged with the ball groove (31).

3. The high-sealing, tight-fitting rubber sealing ring for a ball screw assembly according to claim 1, characterized in that: The outer ring frame (12) has multiple fixing slots (121).

4. The high-sealing, tight-fitting rubber sealing ring for a ball screw assembly according to claim 3, characterized in that: Multiple fixing grooves (121) are symmetrically distributed around the ball screw (30). When the sealing ring (10) is screwed into both sides of the nut (20), the fixing groove (121) and the screw hole of the nut (20) are aligned, and a screw (40) is connected between the fixing groove (121) and the screw hole.

5. The high-sealing, tight-fitting rubber sealing ring for a ball screw assembly according to claim 1, characterized in that: The first sealing lip (112), the second sealing lip (113), and the positioning lip (114) are arranged in a continuous spiral shape inside the through hole (111).

6. The high-sealing, tight-fitting rubber sealing ring for a ball screw assembly according to claim 1, characterized in that: The inner ring (11) and the outer ring skeleton (12) are both cylindrical structures, and the inner ring (11) and the outer ring skeleton (12) are made of nitrile rubber and cold-rolled steel plate, respectively.

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