Framework oil seal

Abstract

The utility model provides a framework oil seal which comprises a rubber body and a framework. The rubber body is provided with an inner wall surface and an outer wall surface, a first sealing lip and a second sealing lip are arranged on the inner wall surface, the section of each sealing lip is provided with a first side edge, a second side edge and a sealing edge, and the sealing edge is connected between the first side edge and the second side edge; the included angle between the first side edge and the central axis of the framework oil seal ranges from 70 degrees to 80 degrees, the included angle between the second side edge and the central axis of the framework oil seal ranges from 40 degrees to 60 degrees, and the included angle between the sealing edge and the central axis of the framework oil seal ranges from 15 degrees to 20 degrees. The included angles of different angles are formed between the three side edges of each sealing lip and the central axis of the framework oil seal, the small-angle design is adopted between the sealing edges and the central axis of the framework oil seal, and when the framework oil seal is assembled in an interference mode, the friction torque can be reduced, and the assembling difficulty can be lowered; and meanwhile, the sealing edge structure can be subjected to self-adaptive deformation after interference assembly, so that stress concentration is reduced, and the assembly quality and the sealing performance are improved.

Description

Technical Field

[0001] This utility model relates to the field of rubber sealing technology, and in particular to a skeleton oil seal. Background Technology

[0002] A skeleton oil seal is a sealing element widely used in mechanical transmission systems. Its main function is to isolate the parts of the transmission components that require lubrication from the external environment, prevent lubricating oil leakage, and prevent external impurities from entering.

[0003] Currently, most of the sealing lips in skeleton oil seals are designed with a large inclination angle. When the skeleton oil seal is interference-fitted onto a shaft or other components, the frictional torque is large, making assembly difficult and easily leading to stress concentration at the lip, which affects the assembly quality. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a skeleton oil seal that reduces assembly difficulty and improves assembly quality.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a skeleton oil seal, which includes an annular rubber body and a skeleton embedded inside the rubber body. The rubber body has an inner wall surface and an outer wall surface arranged opposite to each other. The inner wall surface is provided with a first sealing lip and a second sealing lip. Each sealing lip has a cross-section with a first side, a second side, and a sealing edge. The sealing edge is connected between the first side and the second side. The first side, the second side, and the sealing edge are all inclined to the same side of the axial direction of the skeleton oil seal. The angle between the first side and the central axis of the skeleton oil seal is 70° to 80°, the angle between the second side and the central axis of the skeleton oil seal is 40° to 60°, and the angle between the sealing edge and the central axis of the skeleton oil seal is 15° to 20°.

[0007] Preferably, the rubber body further has a first end face and a second end face disposed opposite to each other, the first end face and the second end face being perpendicular to the central axis of the skeleton oil seal respectively; an arc-shaped sealing part is provided on the first end face, and the surface of the arc-shaped sealing part protrudes from the first end face.

[0008] Preferably, the cross-sectional shape of the skeleton is L-shaped, and the cross-section of the skeleton includes a first support and a second support that are perpendicular to each other. The first support is parallel to the outer wall surface, the second support is parallel to the second end face, and the side of the second support away from the first end face is exposed on the second end face.

[0009] Preferably, the connection between the first support and the second support is an arc-shaped corner.

[0010] Preferably, the connection between the first sealing lip and the second sealing lip is an arc-shaped corner.

[0011] Preferably, the angle between the first side and the central axis of the skeleton oil seal is 78°.

[0012] Preferably, the angle between the second side and the central axis of the skeleton oil seal is 50°.

[0013] Preferably, the angle between the sealing edge and the central axis of the skeleton oil seal is 18°.

[0014] Preferably, the rubber body is vulcanized nitrile butadiene rubber.

[0015] Preferably, the frame is made of cold-rolled steel.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: The skeleton oil seal of this utility model adopts a double-lip sealing structure, which can effectively block the leakage of internal lubricating medium and prevent the intrusion of external contaminants in application. The three sides of each sealing lip have different included angles with the central axis of the skeleton oil seal. The first side, the second side, and the sealing edge are all inclined to the same side of the axial direction of the skeleton oil seal, and the sealing edge and the central axis of the skeleton oil seal are designed with a small angle. When the skeleton oil seal is interference-fitted onto the shaft or other components, it can reduce the friction torque and reduce the assembly difficulty. At the same time, after interference fitting, the sealing edge structure can undergo adaptive deformation, thereby better fitting the shaft or other components, reducing stress concentration, and improving assembly quality and sealing performance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a skeleton oil seal according to the present invention.

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of a skeleton oil seal according to the present invention.

[0019] In the figure, 10-skeleton oil seal, 11-rubber body, 111-inner wall surface, 112-outer wall surface, 113-first sealing lip, 1131-first side, 1132-second side, 1133-sealing edge, 114-second sealing lip, 115-first end face, 1151-arc-shaped sealing part, 116-second end face, 12-skeleton, 121-first support body, 122-second support body. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. It is understood that, without conflict, some technical means of the various embodiments described herein can be substituted for or combined with each other.

[0021] In the description of this utility model, the terms "first," "second," etc., are used only to distinguish the described objects and have no sequential or technical meaning. Therefore, objects specified with "first," "second," etc., may explicitly or implicitly include one or more of those objects. Furthermore, the words "one" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one, while "multiple" indicates at least two.

[0022] In the description of this utility model, references to "one embodiment" or "some embodiments" mean that one or more embodiments of the utility model include the specific features, structures, or characteristics described in connection with that embodiment. Therefore, the phrases "one embodiment," "some embodiments," "other embodiments," "and other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0023] This utility model provides a skeleton oil seal, as shown in the reference. Figure 1 and Figure 2 In some embodiments, the skeleton oil seal 10 includes an annular rubber body 11 and a skeleton 12 embedded inside the rubber body 11. The rubber body 11 has an inner wall surface 111 and an outer wall surface 112 disposed opposite to each other. The inner wall surface 111 is provided with a first sealing lip 113 and a second sealing lip 114. Each sealing lip has a cross-section with a first side, a second side, and a sealing edge. The sealing edge is connected between the first side and the second side. The first side, the second side, and the sealing edge are all inclined to the same side of the axial direction of the skeleton oil seal 10. Taking the first sealing lip 113 as an example, the cross-section of the first sealing lip 113 has a first side 1131, a second side 1132, and a sealing edge 1133. The sealing edge 1133 is connected between the first side 1131 and the second side 1132. The angle A1 between the first side and the central axis of the skeleton oil seal 10 is 70° to 80°, the angle A2 between the second side and the central axis of the skeleton oil seal 10 is 40° to 60°, and the angle A3 between the sealing edge and the central axis of the skeleton oil seal 10 is 15° to 20°.

[0024] The aforementioned skeleton oil seal 10 adopts a double-lip sealing structure, which can effectively block the leakage of internal lubricating medium and prevent the intrusion of external contaminants in application. Each sealing lip has three sides with different included angles to the central axis of the skeleton oil seal 10. The first side, the second side, and the sealing edge are all inclined to the same axial side of the skeleton oil seal 10, and the sealing edge and the central axis of the skeleton oil seal 10 are designed with a small angle. When the skeleton oil seal 10 is interference-fitted onto a shaft or other components, it can reduce frictional torque and reduce assembly difficulty. At the same time, after interference fitting, the sealing edge structure can self-deform, thereby better fitting the shaft or other components, reducing stress concentration, and improving assembly quality and sealing performance.

[0025] In some preferred embodiments, the rubber body 11 further has a first end face 115 and a second end face 116 disposed opposite to each other, the first end face 115 and the second end face 116 being perpendicular to the central axis of the skeleton oil seal 10. An arc-shaped sealing portion 1151 is provided on the first end face 115, the surface of which protrudes beyond the first end face 115. The arc-shaped sealing portion 1151 can be used to tightly fit with other lateral components, enhancing sealing performance.

[0026] In some preferred embodiments, the skeleton 12 has an L-shaped cross-section, which includes a first support 121 and a second support 122 that are perpendicular to each other. The first support 121 is parallel to the outer wall surface 112, and the second support 122 is parallel to the second end face 116, with the side of the second support 122 away from the first end face 115 exposed on the second end face 116. The skeleton 12 provides the necessary support and stability for the skeleton oil seal 10, ensuring that the skeleton oil seal maintains its shape and tension under various operating conditions.

[0027] Furthermore, the connection between the first support 121 and the second support 122 is an arc-shaped corner, which can avoid stress concentration caused by vertical transition and extend the service life of the frame 12.

[0028] Furthermore, the connection between the first sealing lip 113 and the second sealing lip 114 is an arc-shaped corner, which can optimize mechanical properties, avoid stress concentration, thereby preventing fatigue cracking of the rubber material and extending the service life of the skeleton oil seal 10.

[0029] In some preferred embodiments, the included angle A1 between the first side and the central axis of the skeleton oil seal 10 is 78°, the included angle A2 between the second side and the central axis of the skeleton oil seal 10 is 50°, and the included angle A3 between the sealing edge and the central axis of the skeleton oil seal 10 is 18°. This better reduces frictional torque and simplifies assembly; simultaneously, after interference fit, the sealing edge structure can adaptively deform, thereby better fitting the shaft or other components, reducing stress concentration, and improving assembly quality and sealing performance. Of course, this invention is not limited to these embodiments; in other embodiments, the included angles between the first side, the second side, the sealing edge, and the central axis of the skeleton oil seal 10 can also be other suitable angles.

[0030] In some preferred embodiments, the rubber body 11 is made of vulcanized nitrile rubber, which has excellent oil resistance, abrasion resistance, heat resistance and airtightness, which can ensure the reliability of the skeleton oil seal 10 in application and extend the service life of the skeleton oil seal 10.

[0031] Furthermore, the skeleton 12 is made of cold-rolled steel, which has good yield strength and creep resistance, and can provide good support for the skeleton oil seal 10, thereby improving the reliability and stability of the skeleton oil seal 10.

[0032] This utility model's skeleton oil seal adopts a double-lip sealing structure, which can effectively block the leakage of internal lubricating medium and prevent the intrusion of external contaminants. Each sealing lip has three sides with different included angles to the central axis of the skeleton oil seal, and the sealing edge is designed with a small angle to the central axis of the skeleton oil seal. When the skeleton oil seal is interference-fitted onto a shaft or other component, it can reduce frictional torque and simplify assembly. Simultaneously, after interference fitting, the sealing edge structure can self-deform, thereby better fitting the shaft or other component, reducing stress concentration, and improving assembly quality and sealing performance.

[0033] This utility model has been described by the above-described embodiments; however, these embodiments are merely examples for implementing this utility model. It must be noted that the disclosed embodiments do not limit the scope of this utility model. Conversely, any modifications and refinements made without departing from the spirit and scope of this utility model are within the scope of patent protection of this utility model.

Claims

1. A skeleton oil seal, characterized in that: The skeleton oil seal includes an annular rubber body and a skeleton embedded inside the rubber body; the rubber body has an inner wall surface and an outer wall surface arranged opposite to each other, and a first sealing lip and a second sealing lip are provided on the inner wall surface. Each sealing lip has a cross-section with a first side, a second side, and a sealing edge. The sealing edge is connected between the first side and the second side. The first side, the second side, and the sealing edge are all inclined to the same side of the axial direction of the skeleton oil seal; the angle between the first side and the central axis of the skeleton oil seal is 70° to 80°, the angle between the second side and the central axis of the skeleton oil seal is 40° to 60°, and the angle between the sealing edge and the central axis of the skeleton oil seal is 15° to 20°.

2. The skeleton oil seal as described in claim 1, characterized in that: The rubber body also has a first end face and a second end face that are arranged opposite to each other, the first end face and the second end face being perpendicular to the central axis of the skeleton oil seal; an arc-shaped sealing part is provided on the first end face, and the surface of the arc-shaped sealing part protrudes from the first end face.

3. The skeleton oil seal as described in claim 2, characterized in that: The cross-sectional shape of the skeleton is L-shaped. The cross-section of the skeleton includes a first support and a second support that are perpendicular to each other. The first support is parallel to the outer wall surface, the second support is parallel to the second end face, and the side of the second support away from the first end face is exposed on the second end face.

4. The skeleton oil seal as described in claim 3, characterized in that: The connection between the first support and the second support is an arc-shaped corner.

5. The skeleton oil seal as described in claim 1, characterized in that: The connection between the first sealing lip and the second sealing lip is an arc-shaped corner.

6. The skeleton oil seal as described in claim 1, characterized in that: The angle between the first side and the central axis of the skeleton oil seal is 78°.

7. The skeleton oil seal as described in claim 1, characterized in that: The angle between the second side and the central axis of the skeleton oil seal is 50°.

8. The skeleton oil seal as described in claim 1, characterized in that: The angle between the sealing edge and the central axis of the skeleton oil seal is 18°.

9. The skeleton oil seal as described in claim 1, characterized in that: The rubber body is made of vulcanized nitrile butadiene rubber.

10. The skeleton oil seal as described in claim 1, characterized in that: The frame is made of cold-rolled steel.

Images