Combined sealing structure

Abstract

The utility model relates to a combined sealing structure, which is used for being mounted between a box body and an axle, and comprises an oil seal sealing element, a sealing ring and a sealing ring, the oil seal sealing element comprises an annular metal framework and a rubber body coated on the metal framework, and the radial outer side part of the rubber body and the box body are mounted in an interference fit manner; a first sealing lip and a second sealing lip are arranged on the radial inner side part of the rubber body, and the first sealing lip and the second sealing lip are respectively in interference fit with an axle; and the annular teflon sealing piece and the oil seal sealing piece are arranged at intervals in the axial direction of the axle, the radial outer side portion of the teflon sealing piece and the box body are installed in an interference fit mode, and the radial inner side portion of the teflon sealing piece and the axle are installed in an interference fit mode. According to the combined sealing structure, the gap between the box body and the axle is effectively sealed through matching of the oil seal sealing piece and the teflon sealing piece, the sealing effect can be improved, and the use requirement of a high-speed rail in a severe environment can be met through the combined sealing structure.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing, in particular to a combined sealing structure. Background Art

[0002] In rail transit projects, it is necessary to install a seal between the carriage box and the axle of a high-speed rail to seal the gap between the box and the axle to prevent oil leakage or dust. In the prior art, the seal installed between the carriage box and the axle is generally a separate rubber seal or oil seal, which has a simple structure and a poor sealing effect, and cannot meet the use requirements of high-speed rail in harsh environments.

[0003] Therefore, it is necessary to improve one or more problems existing in the above-mentioned related technical solutions.

[0004] It should be noted that this section is intended to provide background or context for the technical solutions of the present invention stated in the claims. The description herein is not admitted to be prior art by inclusion in this section. Utility Model Content

[0005] The purpose of the utility model is to provide a combined sealing structure to improve the sealing effect and meet the use requirements of high-speed railways in harsh environments.

[0006] According to the utility model, a combined sealing structure is provided, which is used to be installed between a box body and an axle, and the combined sealing structure comprises:

[0007] An oil seal, comprising an annular metal frame and a rubber body coated on the metal frame, wherein the radial outer side of the rubber body is installed with the box body by interference fit, and the radial inner side of the rubber body is provided with a first sealing lip and a second sealing lip, and the first sealing lip and the second sealing lip are installed with the axle by interference fit respectively;

[0008] An annular polytetrafluoroethylene seal is spaced apart from the oil seal along the axial direction of the axle, a radial outer portion of the polytetrafluoroethylene seal is installed with an interference fit to the box body, and a radial inner portion of the polytetrafluoroethylene seal is installed with an interference fit to the axle.

[0009] Preferably, a chamfered groove is provided on the surface of the polytetrafluoroethylene seal facing the oil seal;

[0010] Wherein, the first sealing lip is accommodated in the chamfered groove, and the second sealing lip is located on a side of the first sealing lip away from the polytetrafluoroethylene sealing element.

[0011] Preferably, the metal skeleton comprises a main body portion, a reinforcement portion and an extension portion; wherein,

[0012] The main body portion extends along the axial direction of the metal framework;

[0013] The reinforcing portion is connected to one end of the main body portion along the axial direction of the metal framework, and after being bent, it extends along the axial direction of the metal framework and fits against the main body portion;

[0014] The extending portion is connected to the reinforcing portion and extends away from the main body portion along the radial direction of the metal framework.

[0015] Preferably, the extending portion includes a vertical section and an inclined section; wherein,

[0016] The vertical section is connected to the end of the reinforcing portion far from the main body portion and extends away from the main body portion along the radial direction of the metal framework;

[0017] The inclined section is connected to the end of the vertical section far from the reinforcing portion and inclines towards the PTFE seal.

[0018] Preferably, an avoidance portion is provided on the surface of the PTFE seal facing the oil seal, and the avoidance portion is arranged opposite to the inclined section.

[0019] Preferably, along the axial direction of the metal framework, the axial dimension of the reinforcing portion is smaller than the axial dimension of the main body portion.

[0020] Preferably, a first spring is provided on the first sealing lip, and a second spring is provided on the second sealing lip.

[0021] Preferably, an installation groove is formed on the radially outer portion of the PTFE seal, and the inner wall of the installation groove is in interference fit with the box body.

[0022] Preferably, a third sealing lip is provided on the radially inner portion of the PTFE seal, and the third sealing lip is installed in interference fit with the axle.

[0023] Preferably, a convex portion is provided on the surface of the third sealing lip facing away from the oil seal.

[0024] The technical solution provided by the present utility model may include the following beneficial effects:

[0025] In the present utility model, through the above-mentioned combined sealing structure, an oil seal and a PTFE seal are used in cooperation to effectively seal the gap between the box body and the axle. Specifically, on the one hand, the rubber body coated on the outside of the metal skeleton is installed in an interference fit with the box body, and at the same time, the second sealing lip is installed in an interference fit with the axle to prevent the oil medium from leaking from the gap between the box body and the axle. The first sealing lip is installed in an interference fit with the axle, which can effectively prevent the dust on the outside from entering the side of the oil medium from the gap between the box body and the axle, improving the sealing effect; on the other hand, the PTFE seal arranged in cooperation with the oil seal further seals the gap between the box body and the axle, plays a heat preservation effect on the axle near the oil seal, prevents the axle from freezing, and further avoids damage to the oil seal caused by the cold start of the vehicle, that is, plays a certain protective effect on the oil seal, meeting the use requirements of high-speed trains in harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0027] Figure 1 The structural schematic diagram showing the application of the combined sealing structure in the embodiment of the present utility model between the box body and the axle;

[0028] Figure 2 The structural schematic diagram showing the combined sealing structure in the embodiment of the present utility model.

[0029] Reference numerals: 1, box body; 2, axle; 100, oil seal; 110, metal skeleton; 111, main body part; 112, strengthening part; 113, extending part; 1131, vertical section; 1132, inclined section; 120, rubber body; 130, first sealing lip; 140, second sealing lip; 150, first spring; 160, second spring; 200, PTFE seal; 210, chamfer groove; 220, avoiding part; 230, installation groove; 240, third sealing lip. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Now, the exemplary embodiments will be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present utility model will be more complete and comprehensive, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The features, structures, or characteristics described can be combined in any suitable manner in one or more embodiments.

[0031] In addition, the drawings are only schematic diagrams of the embodiments of the present utility model and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus repeated descriptions thereof will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0032] In this exemplary embodiment, a combined sealing structure is first provided for installation between the box body 1 and the axle 2. Refer to Figure 1 and Figure 2 as shown, the combined sealing structure includes:

[0033] An oil seal 100, including an annular metal skeleton 110 and a rubber body 120 coated on the metal skeleton 110. The radially outer part of the rubber body 120 is installed in interference fit with the box body 1, and the radially inner part of the rubber body 120 is provided with a first sealing lip 130 and a second sealing lip 140, and the first sealing lip 130 and the second sealing lip 140 are respectively installed in interference fit with the axle 2;

[0034] An annular tetrafluoro seal 200, arranged at an interval from the oil seal 100 along the axial direction of the axle 2. The radially outer part of the tetrafluoro seal 200 is installed in interference fit with the box body 1, and the radially inner part of the tetrafluoro seal 200 is installed in interference fit with the axle 2.

[0035] It should be noted that the annular metal skeleton 110 is completely wrapped by the rubber body 120, and the metal skeleton 110 plays a role in improving the oil seal 100. Through the rubber body 120 coated on the outside of the metal skeleton 110, it can be ensured that the oil seal 100 fits tightly with the box body 1 and the axle 2.

[0036] It should also be noted that the oil seal 100 and the tetrafluoro seal 200 are coaxially arranged, and the axial directions of the oil seal 100 and the tetrafluoro seal 200 are respectively parallel to the axial direction of the axle 2. Among them, the radial directions of the oil seal 100 and the tetrafluoro seal 200 refer to the directions indicated by the arrows ab in Figure 1 , and the axial directions of the oil seal 100 and the tetrafluoro seal 200 refer to the directions indicated by the arrows cd in Figure 1 .

[0037] With the above combined sealing structure, the oil seal 100 and the PTFE seal 200 can be used in cooperation to effectively seal the gap between the box body 1 and the axle 2. Specifically, on the one hand, the rubber body 120 covering the outside of the metal skeleton 110 is installed in an interference fit with the box body 1, and at the same time, the second sealing lip 140 is installed in an interference fit with the axle 2 to prevent the oil medium from leaking from the gap between the box body 1 and the axle 2. The first sealing lip 130 is installed in an interference fit with the axle 2, which can effectively prevent the dust on the outside from entering the side of the oil medium from the gap between the box body 1 and the axle 2, improving the sealing effect. On the other hand, the PTFE seal 200 provided in cooperation with the oil seal 100 further seals the gap between the box body 1 and the axle 2, plays a heat preservation effect on the axle 2 near the oil seal 100, prevents the axle 2 from freezing, and further avoids damage to the oil seal 100 after the vehicle cold starts, that is, plays a certain protective effect on the oil seal 100, meeting the use requirements of high-speed trains in harsh environments.

[0038] Next, Figures 1 to 2 each part of the above combined sealing structure in this exemplary embodiment will be described in more detail.

[0039] In one embodiment, referring to Figure 1 and Figure 2 as shown, the metal skeleton 110 includes a main body portion 111, a reinforcing portion 112, and an extending portion 113; wherein,

[0040] The main body portion 111 extends along the axial direction of the metal skeleton 110.

[0041] The reinforcing portion 112 is connected to one end of the main body portion 111 along the axial direction of the metal skeleton 110, and after being bent, it extends along the axial direction of the metal skeleton 110 and fits with the main body portion 111.

[0042] The extending portion 113 is connected to the reinforcing portion 112 and extends away from the main body portion 111 along the radial direction of the metal skeleton 110.

[0043] The radial direction of the metal skeleton 110 refers to the direction indicated by the arrow ab in Figure 1 The axial direction of the metal skeleton 110 refers to the direction indicated by the arrow cd in Figure 1 as shown.

[0044] It should be noted that referring to Figure 1As shown, the metal skeleton 110 composed of the main body portion 111, the strengthening portion 112, and the extending portion 113 is generally T-shaped to ensure the overall structural stability of the oil seal 100. In addition, by arranging the strengthening portion 112 along the axial direction of the metal skeleton 110 and extending it along the main body portion 111, the overall strength of the metal skeleton 110 can be improved, and thus the structural strength of the oil seal 100 can be enhanced.

[0045] In one embodiment, referring to Figure 1 and Figure 2 as shown, the extending portion 113 includes a vertical section 1131 and an inclined section 1132; wherein,

[0046] The vertical section 1131 is connected to one end of the strengthening portion 112 away from the main body portion 111 and extends away from the main body portion 111 in the radial direction of the metal skeleton 110;

[0047] The inclined section 1132 is connected to one end of the vertical section 1131 away from the strengthening portion 112 and is inclined towards the PTFE seal 200.

[0048] By setting the extending portion 113 of the metal skeleton 110 in the above shape, it can not only ensure that the metal skeleton 110 plays an overall supporting role for the oil seal 100, but also utilize the setting of the inclined section 1132 to provide a larger installation space on the side of the oil seal 100 away from the PTFE seal 200 for installing other components.

[0049] In one embodiment, referring to Figure 1 and Figure 2 as shown, an avoidance portion 220 is provided on the surface of the PTFE seal 200 facing the oil seal 100, and the avoidance portion 220 is arranged opposite to the inclined section 1132. By providing the avoidance portion 220 on the inner circumferential surface of the PTFE seal 200, the inclined section 1132 of the metal skeleton 110 and the rubber body 120 correspondingly arranged on the inclined section 1132 can be avoided, thereby providing a larger installation space for the components arranged on the side of the oil seal 100 away from the PTFE seal 200.

[0050] Optionally, the avoidance portion 220 provided on the PTFE seal 200 can be an inclined surface structure or a groove structure. The specific structural shape of the avoidance portion 220 is not limited in this embodiment, as long as it can avoid the inclined section 1132.

[0051] In one embodiment, referring to Figure 1 and Figure 2As shown, along the axial direction of the metal skeleton 110, the axial dimension of the reinforcing portion 112 is smaller than that of the main body portion 111. By defining the dimensions of the reinforcing portion 112 and the main body portion 111 of the metal skeleton 110 along the axial direction of the metal skeleton 110, not only can the overall strength of the metal skeleton 110 be ensured, but also it is beneficial to control the size of the metal skeleton 110 and avoid occupying too much installation space.

[0052] In one embodiment, referring to Figure 1 and Figure 2 As shown, a chamfer groove 210 is provided on the surface of the PTFE seal 200 facing the oil seal 100;

[0053] Among them, the first sealing lip 130 is received in the chamfer groove 210, and the second sealing lip 140 is located on the side of the first sealing lip 130 away from the PTFE seal 200.

[0054] By providing the chamfer groove 210 on the surface of the PTFE seal 200 facing the oil seal 100, it is convenient for the first sealing lip 130 to be received in the chamfer groove 210, providing a certain installation space for the oil seal 100 and also being able to reduce the weight of the PTFE seal 200.

[0055] Furthermore, referring to Figure 1 and Figure 2 As shown, the first sealing lip 130 and the second sealing lip 140 are arranged at intervals along the axial direction of the oil seal 100. Among them, a first spring 150 is provided on the first sealing lip 130, and a second spring 160 is provided on the second sealing lip 140. The first spring 150 and the second spring 160 can respectively provide a certain pre-tightening force for the first sealing lip 130 and the second sealing lip 140, so that the first sealing lip 130 and the second sealing lip 140 respectively have a good interference fit with the axle 2, improving the sealing performance.

[0056] Optionally, the first spring 150 and the second spring 160 can be stainless steel springs.

[0057] It should be explained that the PTFE seal 200 in this embodiment can be made of filled PTFE material. The filled PTFE material is a material obtained by adding various fillers to polytetrafluoroethylene to enhance its performance. The fillers can be selected from glass fiber, bronze powder, molybdenum disulfide, graphite, carbon fiber or materials with heat preservation performance to significantly improve the performance of the PTFE seal 200.

[0058] The PTFE seal 200 made of filled PTFE material in this embodiment has good heat resistance and a small friction coefficient, and is suitable for the working condition of sealing between the box body 1 and the axle 2.

[0059] Optionally, referring to Figure 1 and Figure 2As shown, an installation groove 230 is formed in the radially outer portion of the tetrafluoro seal 200. The inner wall of the installation groove 230 is in interference fit with the box body 1, so that there is a certain pre-tightening force between the inner wall of the installation groove 230 and the box body 1, preventing the axial displacement of the tetrafluoro seal 200.

[0060] In one embodiment, referring to Figure 1 and Figure 2 As shown, a third sealing lip 240 is provided on the radially inner portion of the tetrafluoro seal 200. The third sealing lip 240 is installed in interference fit with the axle 2. By further providing the third sealing lip 240 on the tetrafluoro seal 200, the third sealing lip 240 is in interference fit with the axle 2, thus playing a sealing role.

[0061] In one embodiment, referring to Figure 1 and Figure 2 As shown, a convex portion is provided on the surface of the third sealing lip 240 facing away from the oil seal 100, which can increase the contact area between the third sealing lip 240 and the axle 2 to improve the heat preservation effect on the axle 2.

[0062] In this embodiment, the oil seal 100 and the tetrafluoro seal 200 are combined to form a combined sealing structure. Assembling this combined sealing structure between the box body 1 and the axle 2 can also extend the service life of the box body 1, reduce the maintenance frequency, and play a role in cost savings.

[0063] It should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. in the above description indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present invention.

[0064] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0065] In the embodiments of the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "coupling", "fixing", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0066] In the embodiments of the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0067] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0068] Those skilled in the art will readily conceive of other implementations of the present utility model after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present utility model, which follow the general principles of the present invention and include the common general knowledge or conventional technical means in the technical field not disclosed in the present utility model. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present utility model are pointed out by the appended claims.

Claims

1. A combined sealing structure for installation between a box body and an axle, characterized in that The combined sealing structure comprises: An oil seal, comprising an annular metal frame and a rubber body coated on the metal frame, wherein the radial outer side of the rubber body is installed with the box body by interference fit, and the radial inner side of the rubber body is provided with a first sealing lip and a second sealing lip, and the first sealing lip and the second sealing lip are installed with the axle by interference fit respectively; An annular polytetrafluoroethylene seal is spaced apart from the oil seal along the axial direction of the axle, a radial outer portion of the polytetrafluoroethylene seal is installed with an interference fit to the box body, and a radial inner portion of the polytetrafluoroethylene seal is installed with an interference fit to the axle.

2. The combined sealing structure according to claim 1, wherein The surface of the polytetrafluoroethylene seal facing the oil seal is provided with a chamfered groove; Wherein, the first sealing lip is accommodated in the chamfered groove, and the second sealing lip is located on a side of the first sealing lip away from the polytetrafluoroethylene sealing element.

3. The combined sealing structure according to claim 1, wherein, The metal skeleton includes a main body, a reinforcement part and an extension part; wherein, The main body is extended along the axial direction of the metal frame; The reinforcing portion is connected to one end of the main body portion along the axial direction of the metal frame, and is bent and extended along the axial direction of the metal frame to fit the main body portion; The extension portion is connected to the reinforcement portion and extends away from the main body portion along a radial direction of the metal frame.

4. The combined sealing structure according to claim 3, characterized in that, The extension portion includes a vertical section and an inclined section; wherein, The vertical section is connected to one end of the reinforcement portion away from the main body portion, and extends away from the main body portion along the radial direction of the metal frame; The inclined section is connected to an end of the vertical section away from the reinforcing portion and is inclined toward the polytetrafluoroethylene sealing component.

5. The combined sealing structure according to claim 4, characterized in that, A relief portion is arranged on the surface of the polytetrafluoroethylene sealing component facing the oil seal component, and the relief portion is arranged opposite to the inclined section.

6. The combined sealing structure according to any one of claims 3-5, characterized in that, Along the axial direction of the metal skeleton, the axial dimension of the reinforcement part is smaller than the axial dimension of the main body part.

7. The combined sealing structure according to claim 1, wherein A first spring is arranged on the first sealing lip, and a second spring is arranged on the second sealing lip.

8. The combined sealing structure according to claim 1, wherein, A mounting groove is provided on the radial outer side of the polytetrafluoroethylene sealing element, and the inner wall of the mounting groove is interference-fitted with the box body.

9. The combined sealing structure according to claim 1, wherein A third sealing lip is provided on the radial inner side of the polytetrafluoroethylene sealing element, and the third sealing lip is installed with interference fit on the axle.

10. The combined seal structure according to claim 9, wherein A protrusion is provided on the surface of the third sealing lip facing away from the oil seal.

Images