Combined sealing device

Abstract

The utility model provides a combined sealing device which comprises a first framework oil seal, a second framework oil seal and an end cover, the end cover is provided with a first sealing groove and a second sealing groove, the first framework oil seal is assembled at the first sealing groove, and the second framework oil seal is assembled at the second sealing groove. Each framework oil seal comprises an annular rubber body and a framework embedded in the rubber body, and the rubber body is provided with an inner wall surface and an outer wall surface which are oppositely arranged; a first sealing lip and a second sealing lip are arranged on the inner wall surface of a rubber body in the first framework oil seal; and a third sealing lip and a fourth sealing lip are arranged on the inner wall surface of a rubber body in the second framework oil seal. The first framework oil seal and the second framework oil seal form a front independent sealing defense line and a rear independent sealing defense line, and the overall sealing redundancy can be remarkably improved; each framework oil seal is provided with a double-sealing-lip structure, three-dimensional sealing is achieved through the contact surface multiplication effect, axial and radial leakage paths are effectively blocked, and therefore the sealing effect is greatly improved, and the service life of equipment is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, and in particular to a combined sealing device. Background Technology

[0002] Track rollers are crucial components of the tracked walking systems of construction machinery (such as bulldozers, rotary drilling rigs, and tractors). They not only support and transmit weight but also play a key role in preventing derailment, reducing drag, and assisting steering. Track rollers mainly consist of axles, wheel bodies, end caps, bearings, and oil seals. The oil seals, mounted on the end caps, are used to seal and protect the bearings, preventing external impurities from entering the track roller. However, most current track rollers use a single oil seal structure, resulting in poor sealing performance, rapid bearing wear, and reduced service life and operational reliability. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a combined sealing device that improves sealing and protection effects and extends the service life of equipment.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model provides a combined sealing device, which includes a first skeleton oil seal, a second skeleton oil seal, and an end cap. The end cap is provided with a first sealing groove and a second sealing groove in an annular shape, and a stepped structure is formed between the first sealing groove and the second sealing groove. The first skeleton oil seal is fitted at the first sealing groove, and the second skeleton oil seal is fitted at the second sealing groove.

[0006] Each 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 that are disposed opposite to each other. The inner wall surface of the rubber body in the first skeleton oil seal is provided with a first sealing lip and a second sealing lip, and the first sealing lip and the second sealing lip are respectively tightly fitted to the corresponding side wall of the first sealing groove. The inner wall surface of the rubber body in the second skeleton oil seal is provided with a third sealing lip and a fourth sealing lip, and the third sealing lip and the fourth sealing lip are respectively tightly fitted to the corresponding side wall of the second sealing groove.

[0007] Preferably, the cross-sections of the first sealing lip and the second sealing lip each have a first side, a second side, and a first sealing edge. The first sealing edge is connected between the first side and the second side, and the first side, the second side, and the first sealing edge are all inclined toward the same axial side of the first skeleton oil seal.

[0008] Preferably, the angle between the first side and the central axis of the first skeleton oil seal is 70° to 80°, the angle between the second side and the central axis of the first skeleton oil seal is 40° to 60°, and the angle between the first sealing edge and the central axis of the first skeleton oil seal is 15° to 20°.

[0009] Preferably, the rubber body of the first skeleton oil seal also has a first end face and a second end face that are disposed opposite to each other, the first end face and the second end face being perpendicular to the central axis of the first skeleton oil seal; an arc-shaped sealing part is provided on the first end face, the surface of the arc-shaped sealing part protruding from the first end face, and the arc-shaped sealing part being tightly fitted with the corresponding side wall of the first sealing groove.

[0010] Preferably, the cross-sectional shape of the skeleton in the first skeleton oil seal 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.

[0011] Preferably, the cross-sections of the third sealing lip and the fourth sealing lip each have a third side, a fourth side, and a second sealing edge. The second sealing edge is connected between the third side and the fourth side. The third side and the fourth side are inclined toward one axial side of the second skeleton oil seal, and the second sealing edge is inclined toward the other axial side of the second skeleton oil seal.

[0012] Preferably, the angle between the third side and the central axis of the second skeleton oil seal is 45° to 50°, the angle between the fourth side and the central axis of the second skeleton oil seal is 25° to 30°, and the angle between the second sealing edge and the central axis of the second skeleton oil seal is 50° to 60°.

[0013] Preferably, the rubber body in the second skeleton oil seal is provided with an auxiliary groove on one axial side, and a fifth sealing lip and a sixth sealing lip are provided at the auxiliary groove. The fifth sealing lip and the sixth sealing lip are respectively tightly fitted to the corresponding sidewall of the second sealing groove.

[0014] Preferably, the cross-section of the skeleton in the second skeleton oil seal includes a third support, a fourth support, and a fifth support, wherein the fourth support is connected between the third support and the fifth support, and the third support and the fifth support are perpendicular to the fourth support.

[0015] Preferably, the rubber body in each skeleton oil seal is made of vulcanized nitrile rubber; the skeleton is made of cold-rolled steel.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: The combined sealing device of this utility model adopts a multi-layer sealing reinforcement structure and a double-layer sealing architecture of first and second skeleton oil seals, forming two independent sealing defense lines at the front and rear, which significantly improves the overall sealing redundancy; the inner wall surface of each skeleton oil seal is provided with a double sealing lip structure, which achieves three-dimensional sealing through the contact surface multiplication effect, effectively blocking axial and radial leakage paths, thereby greatly improving the sealing effect. When applied to support rollers, it can effectively protect the internal structure of the support rollers and extend the service life of the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a combined sealing device according to the present invention.

[0018] Figure 2 This is a schematic cross-sectional view of the first skeleton oil seal in some embodiments of the present invention.

[0019] Figure 3 This is a schematic cross-sectional view of the second skeleton oil seal in some embodiments of this utility model.

[0020] Figure 4 This is a cross-sectional view of the combined sealing device of this utility model when applied to a support roller.

[0021] In the figure, 10-first 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-first 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. 20-Second skeleton oil seal, 21-Rubber body, 211-Inner wall surface, 212-Outer wall surface, 213-Third sealing lip, 2131-Third side edge, 2132-Fourth side edge, 2133-Second sealing edge, 214-Fourth sealing lip, 215-Auxiliary groove, 216-Fifth sealing lip, 217-Sixth sealing lip, 22-Skeleton, 221-Third support body, 222-Fourth support body, 223-Fifth support body. 30-End cap, 31-First sealing groove, 32-Second sealing groove, 40-Bearing, 50-Support roller. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] This utility model provides a combined sealing device, as shown in the reference. Figure 1 The combined sealing device includes a first skeleton oil seal 10, a second skeleton oil seal 20 and an end cap 30. The end cap 30 is provided with a first sealing groove 31 and a second sealing groove 32 in an annular shape, and a stepped structure is formed between the first sealing groove 31 and the second sealing groove 32. The first skeleton oil seal 10 is assembled at the first sealing groove 31 and the second skeleton oil seal 20 is assembled at the second sealing groove 32.

[0026] Each skeleton oil seal includes an annular rubber body and a skeleton embedded inside the rubber body. The rubber body has opposing inner and outer wall surfaces. Specifically, refer to the reference... Figure 1 and Figure 2 The first 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 that are disposed opposite to each other. (Refer to reference...) Figure 1 and Figure 3The second skeleton oil seal 20 includes an annular rubber body 21 and a skeleton 22 embedded inside the rubber body 21. The rubber body 21 has an inner wall surface 211 and an outer wall surface 212 that are disposed opposite to each other.

[0027] Furthermore, the inner wall surface 111 of the rubber body 11 in the first skeleton oil seal 10 is provided with a first sealing lip 113 and a second sealing lip 114, which are respectively tightly fitted to the corresponding sidewalls of the first sealing groove 31. The inner wall surface 211 of the rubber body 21 in the second skeleton oil seal 20 is provided with a third sealing lip 213 and a fourth sealing lip 214, which are respectively tightly fitted to the corresponding sidewalls of the second sealing groove 32.

[0028] The aforementioned combined sealing device adopts a multi-layer sealing reinforcement structure, employing a double-layer sealing architecture of a first skeleton oil seal 10 and a second skeleton oil seal 20, forming two independent sealing defense lines at the front and rear, significantly improving the overall sealing redundancy; the inner wall surface of each skeleton oil seal is equipped with a double sealing lip structure, achieving three-dimensional sealing through the contact surface multiplication effect, effectively blocking axial and radial leakage paths, thereby greatly improving the sealing effect. When applied to support rollers, it can effectively protect the internal structure of the support rollers and extend the service life of the equipment.

[0029] In some preferred embodiments, the cross-sections of the first sealing lip 113 and the second sealing lip 114 each have a first side, a second side, and a first sealing edge. The first sealing edge is connected between the first side and the second side, and the first side, the second side, and the first sealing edge are all inclined toward the same axial side of the first 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 first sealing edge 1133. The first sealing edge 1133 is connected between the first side 1131 and the second side 1132, and the first side 1131, the second side 1132, and the first sealing edge 1133 are all inclined toward the same axial side of the first skeleton oil seal 10.

[0030] Furthermore, the included angle A1 between the first side and the central axis of the first skeleton oil seal 10 is 70° to 80°, the included angle A2 between the second side and the central axis of the first skeleton oil seal 10 is 40° to 60°, and the included angle A3 between the first sealing edge and the central axis of the first skeleton oil seal 10 is 15° to 20°.

[0031] The first 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. The three sides of the first and second sealing lips have different included angles with the central axis of the first skeleton oil seal 10, and the first sealing edge adopts a small angle design with the central axis of the first skeleton oil seal 10. When the first skeleton oil seal 10 is interference-fitted into the first sealing groove 31, it can reduce the frictional torque and reduce the assembly difficulty. At the same time, after interference fitting, the structure of the first sealing edge can undergo adaptive deformation, thereby better fitting the end cap, reducing stress concentration, and improving assembly quality and sealing performance.

[0032] In some preferred embodiments, the included angle A1 between the first side and the central axis of the first skeleton oil seal 10 is 78°, the included angle A2 between the second side and the central axis of the first skeleton oil seal 10 is 50°, and the included angle A3 between the first sealing edge and the central axis of the first skeleton oil seal 10 is 18°. This better reduces frictional torque and simplifies assembly; simultaneously, after interference fit, the first 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. Of course, this invention is not limited to these embodiments; in other embodiments, the included angles between the first side, the second side, the first sealing edge, and the central axis of the first skeleton oil seal 10 can also be other suitable angles.

[0033] Reference Figure 2 The rubber body 11 of the first skeleton oil seal 10 also has a first end face 115 and a second end face 116 arranged opposite to each other. The first end face 115 and the second end face 116 are perpendicular to the central axis of the first skeleton oil seal 10. An arc-shaped sealing part 1151 is provided on the first end face 115. The surface of the arc-shaped sealing part 1151 protrudes from the first end face 115. The arc-shaped sealing part 1151 is tightly fitted with the corresponding side wall of the first sealing groove 31, thereby enhancing the sealing performance.

[0034] Furthermore, the cross-sectional shape of the skeleton 12 in the first skeleton oil seal 10 is L-shaped. The cross-section of the skeleton 12 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. The side of the second support 122 that is away from the first end face 115 is exposed on the second end face 116. The skeleton 12 is used to provide necessary support and stability for the first skeleton oil seal 10, ensuring that the first skeleton oil seal 10 can maintain its shape and tension under various working conditions, and extending the service life of the first skeleton oil seal 10.

[0035] Furthermore, the connection between the first support 121 and the second support 122 is an arc-shaped corner, which can avoid stress concentration and extend the service life of the first skeleton oil seal 10.

[0036] Reference Figure 3 In some preferred embodiments, the cross-sections of the third sealing lip 213 and the fourth sealing lip 214 each have a third side, a fourth side, and a second sealing edge. The second sealing edge is connected between the third side and the fourth side. The third side and the fourth side are inclined towards one axial side of the second skeleton oil seal 20, and the second sealing edge is inclined towards the other axial side of the second skeleton oil seal 20. Taking the third sealing lip 213 as an example, the cross-section of the third sealing lip 213 has a third side 2131, a fourth side 2132, and a second sealing edge 2133. The second sealing edge 2133 is connected between the third side 2131 and the fourth side 2132. The third side 2131 and the fourth side 2132 are inclined towards one axial side of the second skeleton oil seal 20, and the second sealing edge 2133 is inclined towards the other axial side of the second skeleton oil seal 20. The second skeleton oil seal 20 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.

[0037] Reference Figure 3 The angle B1 between the third side and the central axis of the second skeleton oil seal 20 is 45° to 50°, the angle B2 between the fourth side and the central axis of the second skeleton oil seal 20 is 25° to 30°, and the angle B3 between the second sealing edge and the central axis of the second skeleton oil seal 20 is 50° to 60°.

[0038] Preferably, the angle B1 between the third side and the central axis of the second skeleton oil seal 20 is 48°, the angle B2 between the fourth side and the central axis of the second skeleton oil seal 20 is 28°, and the angle B3 between the second sealing edge and the central axis of the second skeleton oil seal 20 is 52°. This achieves a better sealing effect.

[0039] Furthermore, the rubber body 21 in the second skeleton oil seal 20 has an auxiliary groove 215 on one axial side, and a fifth sealing lip 216 and a sixth sealing lip 217 are provided at the auxiliary groove 215. The fifth sealing lip 216 and the sixth sealing lip 217 are respectively tightly fitted to the corresponding sidewalls of the second sealing groove 32. The fifth sealing lip 216 and the sixth sealing lip 217 can further enhance the sealing performance between the second skeleton oil seal 20 and the end cap 30.

[0040] 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 first skeleton oil seal 10.

[0041] Reference Figure 3In some embodiments, the cross-section of the skeleton 22 in the second skeleton oil seal 20 is approximately U-shaped. The cross-section of the skeleton 22 in the second skeleton oil seal 20 includes a third support 221, a fourth support 222, and a fifth support 223. The fourth support 222 connects the third support 221 and the fifth support 223. The third support 221 and the fifth support 223 are perpendicular to the fourth support 221. The skeleton 22 is used to provide necessary support and stability for the second skeleton oil seal 20, ensuring that the second skeleton oil seal 20 maintains its shape and tension under various working conditions, thereby extending the service life of the second skeleton oil seal 20.

[0042] Furthermore, the connection points between the third support 221 and the fourth support 222, and between the fourth support 222 and the fifth support 223, are arc-shaped corners, which can avoid stress concentration and extend the service life of the second skeleton oil seal 20.

[0043] In some preferred embodiments, the rubber body in each skeleton oil seal is made of vulcanized nitrile rubber, which has excellent oil resistance, abrasion resistance, heat resistance and airtightness, ensuring the reliability of the skeleton oil seal in application and extending the service life of the skeleton oil seal.

[0044] Furthermore, the skeleton in each skeleton oil seal is made of cold-rolled steel, which has good yield strength and creep resistance, and can provide good support for the skeleton oil seal, thereby improving the reliability and stability of the skeleton oil seal.

[0045] Reference Figure 4 When the above-mentioned combined sealing device is applied to the support roller 50, the first skeleton oil seal 10 is located between the end cover 30 and the support roller 50, and the second skeleton oil seal 20 is located between the end cover 30, the support roller 50 and the bearing 40. The double-layer sealing structure of the first skeleton oil seal 10 and the second skeleton oil seal 20 forms two independent sealing defense lines, which can significantly improve the overall sealing redundancy. The inner wall surface of each skeleton oil seal is provided with a double sealing lip structure, which achieves three-dimensional sealing through the contact surface multiplication effect, effectively blocking axial and radial leakage paths, thereby greatly improving the sealing effect, effectively protecting the internal structure of the support roller 50 and extending the service life of the equipment.

[0046] This utility model's combined sealing device adopts a multi-layer sealing reinforcement structure, using a double-layer sealing architecture of first and second skeleton oil seals to form two independent sealing defense lines, significantly improving the overall sealing redundancy; each skeleton oil seal has a double sealing lip structure on its inner wall surface, achieving three-dimensional sealing through the contact surface multiplication effect, effectively blocking axial and radial leakage paths, thereby greatly improving the sealing effect. When applied to support rollers, it can effectively protect the internal structure of the support rollers and extend the service life of the equipment.

[0047] 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 combined sealing device, characterized in that: The combined sealing device includes a first skeleton oil seal, a second skeleton oil seal, and an end cap. The end cap is provided with a first sealing groove and a second sealing groove in an annular shape, and a stepped structure is formed between the first sealing groove and the second sealing groove. The first skeleton oil seal is fitted at the first sealing groove, and the second skeleton oil seal is fitted at the second sealing groove. Each 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 that are disposed opposite to each other. The inner wall surface of the rubber body in the first skeleton oil seal is provided with a first sealing lip and a second sealing lip, and the first sealing lip and the second sealing lip are respectively tightly fitted to the corresponding side wall of the first sealing groove. The inner wall surface of the rubber body in the second skeleton oil seal is provided with a third sealing lip and a fourth sealing lip, and the third sealing lip and the fourth sealing lip are respectively tightly fitted to the corresponding side wall of the second sealing groove.

2. The combined sealing device as described in claim 1, characterized in that: The first sealing lip and the second sealing lip each have a first side, a second side, and a first sealing edge in their cross sections. The first sealing edge is connected between the first side and the second side. The first side, the second side, and the first sealing edge are all inclined toward the same axial side of the first skeleton oil seal.

3. The combined sealing device as described in claim 2, characterized in that: The angle between the first side and the central axis of the first skeleton oil seal is 70° to 80°, the angle between the second side and the central axis of the first skeleton oil seal is 40° to 60°, and the angle between the first sealing edge and the central axis of the first skeleton oil seal is 15° to 20°.

4. The combined sealing device as described in claim 1, characterized in that: The rubber body of the first skeleton oil seal 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 are respectively perpendicular to the central axis of the first skeleton oil seal. An arc-shaped sealing part is provided on the first end face. The surface of the arc-shaped sealing part protrudes from the first end face. The arc-shaped sealing part is tightly fitted with the corresponding side wall of the first sealing groove.

5. The combined sealing device as described in claim 4, characterized in that: The cross-sectional shape of the skeleton in the first skeleton oil seal 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.

6. The combined sealing device as described in claim 1, characterized in that: The cross-sections of the third sealing lip and the fourth sealing lip each have a third side, a fourth side, and a second sealing edge. The second sealing edge is connected between the third side and the fourth side. The third side and the fourth side are inclined toward one axial side of the second skeleton oil seal, and the second sealing edge is inclined toward the other axial side of the second skeleton oil seal.

7. The combined sealing device as described in claim 6, characterized in that: The angle between the third side and the central axis of the second skeleton oil seal is 45° to 50°, the angle between the fourth side and the central axis of the second skeleton oil seal is 25° to 30°, and the angle between the second sealing edge and the central axis of the second skeleton oil seal is 50° to 60°.

8. The combined sealing device as described in claim 1, characterized in that: The second skeleton oil seal has an auxiliary groove on one axial side of the rubber body, and a fifth sealing lip and a sixth sealing lip are provided at the auxiliary groove. The fifth sealing lip and the sixth sealing lip are respectively tightly fitted to the corresponding side wall of the second sealing groove.

9. The combined sealing device as described in claim 1, characterized in that: The cross-section of the skeleton in the second skeleton oil seal includes a third support, a fourth support, and a fifth support. The fourth support is connected between the third support and the fifth support, and the third support and the fifth support are perpendicular to the fourth support.

10. The combined sealing device as claimed in claim 1, characterized in that: The rubber body in each skeleton oil seal is made of vulcanized nitrile rubber; the skeleton is made of cold-rolled steel.

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