Oil seal with limiting function and sealing structure

Abstract

The oil seal is provided with a sealing part and a limiting shoulder part, the oil seal comprises a rubber main body and a framework arranged in the rubber main body, the rubber main body is provided with the sealing part and a limiting flange, the sealing part is used for sealing between an outer side sealing object and an inner side sealing object, and the limiting shoulder part is used for limiting the limiting shoulder part. The limiting flange is arranged on the periphery of the sealing part, the framework comprises a limiting transverse plate, the limiting transverse plate is arranged in the limiting flange, the limiting shoulder part comprises the limiting flange and the limiting transverse plate, and the limiting shoulder part is used for abutting against the end face of an outer side sealing object for limiting. The oil seal is provided with the limiting shoulder part, when the oil seal is pressed into a cavity of an outer side sealing object and the limiting shoulder part is pressed to the end face of the outer side sealing object, the press-fitting depth of the oil seal reaches the needed depth, the oil seal can be judged to be installed in place, and a detection tool does not need to be additionally used for measuring whether the press-fitting depth of the oil seal is qualified or not. The installation process can be simplified while the installation precision is guaranteed, and the installation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sealing technical field especially relates to an oil seal and sealing structure with limiting. BACKGROUND

[0002] Oil seal is important sealing part, and the dimensional stability of the pressing depth of the oil seal installed in the inner wall of the cavity of the sealed object has an important influence on the sealing effect, and poor dimensional stability of the pressing depth will cause the contact area between the lip of the oil seal and the shaft to change during work, thereby affecting the service life of the product.

[0003] The existing oil seal structure is pressed into the cavity of the sealed object 02 first during pressing, and the oil seal 01 is pressed into the cavity of the sealed object 02. Figure 1 The pressing depth of the oil seal is guaranteed by controlling the pressing force of the pressing equipment during the pressing process, but the depth dimension of the oil seal pressing will fluctuate due to the influence of the change of the friction between the outer diameter of the oil seal and the inner wall of the cavity, which affects the qualification rate of the oil seal installation. UTILITY MODEL CONTENTS

[0004] The main purpose of the utility model is to provide an oil seal and sealing structure with limiting, which aims to solve the technical problems of the complicated installation process and low installation efficiency of the oil seal in the prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides an oil seal with limiting, which is provided with a sealing part and a limiting shoulder part, and comprises a rubber main body and a framework arranged in the rubber main body, wherein the rubber main body is provided with the sealing part and a limiting flange, the sealing part is used for sealing between the outer sealing object and the inner sealing object, the limiting flange is arranged on the outer periphery of the sealing part, the framework comprises a limiting horizontal plate, and the limiting horizontal plate is arranged in the limiting flange.

[0006] In the utility model, the oil seal is provided with a limiting shoulder part, when the limiting shoulder part is pressed against the end face of the outer sealing object during pressing of the oil seal into the cavity of the outer sealing object, it indicates that the pressing depth of the oil seal reaches the required depth, that is, the oil seal is installed in place, the consistency of the pressing depth dimension is improved, and it is not necessary to use a detection tool to measure whether the pressing depth of the oil seal is qualified, which can simplify the installation process and improve the installation efficiency while ensuring the installation accuracy.

[0007] Preferably, the lower side of the limiting shoulder includes at least a portion of the lower side of the limiting cross plate, and the lower side of the limiting cross plate can directly abut against the end face of the outer sealing object.

[0008] During press fitting, the lower side of the rigid limiting plate directly abuts against the end face of the outer sealing object, ensuring that the contact between the limiting shoulder and the end face of the outer sealing object is rigid. This guarantees the relative dimensions between the limiting shoulder and the outer sealing object and improves the limiting and positioning accuracy of the oil seal.

[0009] Preferably, the limiting flange is provided on the upper side and outer periphery of the limiting cross plate.

[0010] Preferably, the frame includes a vertical plate, a first horizontal plate, and a second horizontal plate. The first horizontal plate is disposed on the upper side of the vertical plate and extends laterally toward the middle of the oil seal. The second horizontal plate is disposed on the upper side of the vertical plate and the second horizontal plate. The side of the second horizontal plate near the middle of the oil seal is connected to the side of the first horizontal plate near the middle of the oil seal. The second horizontal plate includes a limiting horizontal plate, which is disposed on the side of the second horizontal plate away from the middle of the oil seal and extends to the outer side of the vertical plate. The sides of the vertical plate, the first horizontal plate, and the second horizontal plate away from the limiting horizontal plate are disposed within the sealing portion.

[0011] Since the sealing part of the oil seal will be heated and pressure generated during operation, the skeleton of this utility model includes a first horizontal plate and a second horizontal plate. The first horizontal plate and the second horizontal plate arranged vertically can obtain high structural strength, improve the compressive strength of the sealing part, reduce the deformation of the oil seal caused by pressure during operation, and ensure the sealing performance of the oil seal. At the same time, the second horizontal plate can extend into a limiting horizontal plate, which makes the structure more reasonable.

[0012] Preferably, the vertical plate and the first horizontal plate are provided with a first bending structure, and the first horizontal plate and the second horizontal plate are provided with a second bending structure.

[0013] Preferably, the sealing part includes an outer sealing body disposed on the outer side and an inner sealing body disposed on the inner side. The outer side of the outer sealing body is used to abut and seal with the outer sealing object, and the inner side of the inner sealing body is used to abut and seal with the inner sealing object. The upper side of the outer sealing body is connected to the upper side of the inner sealing body. The vertical plate is disposed in the outer sealing body, and the connection part between the first horizontal plate and the second horizontal plate is disposed in the connection part between the outer sealing body and the inner sealing body.

[0014] Preferably, the inner sealing body is provided with an upper sealing lip and a lower sealing lip on its inner side. The upper and lower sealing lips abut against the inner sealing object to improve the sealing performance.

[0015] In another aspect, this utility model also proposes a sealing structure with the aforementioned self-limiting oil seal. The sealing structure further includes an outer sealing object, the sealing part being disposed in the cavity of the outer sealing object, and the limiting shoulder abutting against the end face of the outer sealing object.

[0016] By using the aforementioned oil seal with built-in limit, the installation process can be simplified and installation efficiency improved. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the cross-sectional structure of an existing oil seal.

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the oil seal of this utility model;

[0020] Figure 3 This is a schematic cross-sectional view of the oil seal of this utility model when it is installed on the outer sealing object;

[0021] Figure 4 This is a cross-sectional structural schematic diagram of another embodiment of the oil seal of this utility model.

[0022] In the attached diagram: 1-Rubber body, 11-Limiting flange, 2-Skeleton, 21-Vertical plate, 22-First horizontal plate, 23-Second horizontal plate, 231-Limiting horizontal plate, 24-First bending structure, 25-Second bending structure, 3-Sealing part, 31-Outer sealing body, 32-Inner sealing body, 321-Upper sealing lip, 323-Lower sealing lip, 4-Limiting shoulder, 5-Outer sealing object, 51-End face.

[0023] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that if the embodiments of this utility model involve directional indicators, such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0026] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0027] like Figures 2 to 4 As shown, an oil seal with a self-limiting function is provided. The oil seal has a sealing part 3 and a limiting shoulder 4. The oil seal includes a rubber body 1 and a skeleton 2 disposed within the rubber body 1. The rubber body 1 has a sealing part 3 and a limiting flange 11. The sealing part 3 is used to seal between the outer sealing object 5 and the inner sealing object (not shown in the figure). The limiting flange 11 is disposed on the outer periphery of the sealing part 3. The skeleton 2 includes a limiting cross plate 231, which is disposed within the limiting flange 11. The limiting shoulder 4 includes the limiting flange 11 and the limiting cross plate 231. The limiting shoulder 4 is used to abut and limit the end face 51 of the outer sealing object 5.

[0028] In this utility model, the oil seal is provided with a limiting shoulder 4. When the oil seal is pressed into the cavity of the outer sealing object 5, when the limiting shoulder 4 is pressed to the end face 51 of the outer sealing object 5, it indicates that the oil seal has reached the required depth, and the oil seal can be judged to be installed in place. There is no need to use a separate testing tool to measure whether the pressing depth of the oil seal is qualified. While ensuring installation accuracy, the installation process can be simplified and the installation efficiency can be improved. In addition, the frame 2 is provided with a limiting cross plate 231 located inside the limiting shoulder 4, which can improve the strength of the limiting shoulder 4, making the limiting shoulder 4 less prone to deformation and improving the installation limiting accuracy.

[0029] In some specific embodiments, the lower side of the limiting shoulder 4 includes at least a portion of the lower side of the limiting cross plate 231, and the lower side of the limiting cross plate 231 can directly abut against the end face 51 of the outer sealing object 5.

[0030] During press-fitting, the lower side of the rigid limiting plate 231 directly abuts against the end face 51 of the outer sealing object 5, ensuring a rigid contact between the limiting shoulder 4 and the end face 51 of the outer sealing object 5. This guarantees the relative dimensions of the limiting shoulder 4 and the outer sealing object 5, improving the limiting and positioning accuracy of the oil seal. If the lower side of the limiting plate 231 uses a limiting flange 11 to contact the outer sealing object 5, the limiting flange 11, being made of elastic material, may compress under varying press-fitting forces, causing a change in the relative position of the limiting shoulder 4 and the outer sealing object 5, thus reducing the limiting and positioning accuracy of the limiting shoulder 4.

[0031] Specifically, the limiting flange 11 is provided on the upper side and outer periphery of the limiting horizontal plate 231, and can wrap the limiting horizontal plate 231 on the upper side and outer periphery.

[0032] In some specific embodiments, reference is made to Figure 2 and Figure 3 The frame 2 includes a vertical plate 21, a first horizontal plate 22, and a second horizontal plate 23. The first horizontal plate 22 is located on the upper side of the vertical plate 21 and extends laterally toward the middle of the oil seal. The second horizontal plate 23 is located on the upper side of the vertical plate 21 and the second horizontal plate 23. The side of the second horizontal plate 23 near the middle of the oil seal is connected to the side of the first horizontal plate 22 near the middle of the oil seal. The second horizontal plate 23 includes a limiting horizontal plate 231, which is located on the side of the second horizontal plate 23 away from the middle of the oil seal and extends to the outside of the vertical plate 21. The sides of the vertical plate 21, the first horizontal plate 22, and the second horizontal plate 23 away from the limiting horizontal plate 231 are located inside the sealing part 3.

[0033] Since the sealing part 3 of the oil seal will be heated and generate pressure during operation, the skeleton 2 in this utility model includes a first horizontal plate 22 and a second horizontal plate 23. The first horizontal plate 22 and the second horizontal plate 23 arranged vertically can obtain high structural strength, improve the compressive strength of the sealing part 3, reduce the deformation of the oil seal caused by pressure during operation, and ensure the sealing performance of the oil seal. At the same time, the second horizontal plate 23 can extend into a limiting horizontal plate 231, which makes the structure more reasonable.

[0034] Furthermore, the vertical plate 21 and the first horizontal plate 22 are provided with a first bending structure 24, and the first horizontal plate 22 and the second horizontal plate 23 are provided with a second bending structure 25. The vertical plate 21, the first horizontal plate 22 and the second horizontal plate 23 of the frame 2 are integrally bent and formed, which simplifies the processing of the frame 2.

[0035] Furthermore, the sealing part 3 includes an outer sealing body 31 disposed on the outer side and an inner sealing body 32 disposed on the inner side. The outer side of the outer sealing body 31 is used to abut and seal with the outer sealing object 5, and the inner side of the inner sealing body 32 is used to abut and seal with the inner sealing object. The upper side of the outer sealing body 31 is connected to the upper side of the inner sealing body 32. The vertical plate 21 is disposed inside the outer sealing body 31, and the connection part of the first horizontal plate 22 and the second horizontal plate 23 is disposed inside the connection part of the outer sealing body 31 and the inner sealing body 32.

[0036] During operation, the connection between the outer sealing body 31 and the inner sealing body 32 is subject to greater heat. Therefore, the connection between the first horizontal plate 22 and the second horizontal plate 23 is located within the connection between the outer sealing body 31 and the inner sealing body 32. This can improve the structural strength of this location, reduce deformation during operation, and better ensure sealing performance.

[0037] In other embodiments, reference is made to Figure 4 The cross-sectional shape of the skeleton 2 can be T-shaped, which can also realize the limiting function of the limiting plate 231.

[0038] In some specific embodiments, the inner sealing body 32 is provided with an upper sealing lip 321 and a lower sealing lip 323 on its inner side. The upper sealing lip 321 and the lower sealing lip 323 abut against the inner sealing object to improve the sealing performance.

[0039] On the other hand, refer to Figure 3 A sealing structure having the aforementioned self-limiting oil seal, the sealing structure further includes an outer sealing object 5, a sealing part 3 disposed in the cavity of the outer sealing object 5, and a limiting shoulder 4 abutting against the end face 51 of the outer sealing object 5.

[0040] By using the aforementioned self-limiting oil seal, the installation process can be simplified and installation efficiency improved when the oil seal needs to be press-fitted into the cavity of the outer sealing object 5.

[0041] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An oil seal with built-in limiting function, characterized in that, The oil seal is provided with a sealing part (3) and a limiting shoulder (4). The oil seal includes a rubber body (1) and a skeleton (2) disposed in the rubber body (1). The rubber body (1) is provided with the sealing part (3) and a limiting flange (11). The sealing part (3) is used to seal between the outer sealing object (5) and the inner sealing object. The limiting flange (11) is disposed on the outer periphery of the sealing part (3). The skeleton (2) includes a limiting horizontal plate (231). The limiting horizontal plate (231) is disposed in the limiting flange (11). The limiting shoulder (4) includes the limiting flange (11) and the limiting horizontal plate (231). The limiting shoulder (4) is used to abut against and limit the end face (51) of the outer sealing object (5).

2. The oil seal with self-limiting function as described in claim 1, characterized in that, The lower side of the limiting shoulder (4) includes at least a portion of the lower side of the limiting cross plate (231), the lower side of the limiting cross plate (231) being able to directly abut against the end face (51) of the outer sealing object (5).

3. The oil seal with self-limiting function as described in claim 2, characterized in that, The limiting flange (11) is located on the upper side and outer periphery of the limiting transverse plate (231).

4. The oil seal with self-limiting function as described in claim 1, characterized in that, The frame (2) includes a vertical plate (21), a first horizontal plate (22) and a second horizontal plate (23). The first horizontal plate (22) is located on the upper side of the vertical plate (21) and extends laterally toward the middle of the oil seal. The second horizontal plate (23) is located on the upper side of the vertical plate (21) and the second horizontal plate (23). The side of the second horizontal plate (23) near the middle of the oil seal is connected to the side of the first horizontal plate (22) near the middle of the oil seal. The second horizontal plate (23) includes a limiting horizontal plate (231). The limiting horizontal plate (231) is located on the side of the second horizontal plate (23) away from the middle of the oil seal and extends to the outside of the vertical plate (21). The side of the vertical plate (21), the first horizontal plate (22) and the second horizontal plate (23) away from the limiting horizontal plate (231) is located inside the sealing part (3).

5. The oil seal with self-limiting function as described in claim 4, characterized in that, The vertical plate (21) and the first horizontal plate (22) are provided with a first bending structure (24), and a second bending structure (25) is provided between the first horizontal plate (22) and the second horizontal plate (23).

6. The oil seal with self-limiting function as described in claim 4, characterized in that, The sealing part (3) includes an outer sealing body (31) on the outside and an inner sealing body (32) on the inside. The outer side of the outer sealing body (31) is used to abut against the outer sealing object (5) for sealing. The inner side of the inner sealing body (32) is used to abut against the inner sealing object for sealing. The upper side of the outer sealing body (31) is connected to the upper side of the inner sealing body (32). The vertical plate (21) is located inside the outer sealing body (31). The connection part of the first horizontal plate (22) and the second horizontal plate (23) is located inside the connection part of the outer sealing body (31) and the inner sealing body (32).

7. The oil seal with self-limiting function as described in claim 6, characterized in that, The inner sealing body (32) is provided with an upper sealing lip (321) and a lower sealing lip (323) on its inner side.

8. A sealing structure, characterized in that, The sealing structure includes a self-limiting oil seal as described in any one of claims 1 to 7, and further includes an outer sealing object (5), the sealing part (3) being disposed in the cavity of the outer sealing object (5), and the limiting shoulder (4) abutting against the end face (51) of the outer sealing object (5).

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