Hub oil seal

Abstract

The utility model discloses a hub oil seal which comprises a sealing body and a framework. The sealing body comprises a body part, a connecting bridge part and a sealing lip part, the connecting bridge part is connected to the inner periphery of the body part and extends inwards in the radial direction, and the sealing lip part is connected to the inner periphery of the connecting bridge part. The sealing body is provided with a first groove part located above the connecting bridge part and a second groove part located below the connecting bridge part, and the framework is embedded in the body part. According to the utility model, the journal sticking force can be reduced, the abrasion can be reduced, the service life can be prolonged, and inconvenience caused by frequent replacement can be avoided.

Description

Technical Field

[0001] The utility model relates to a hub oil seal. Background Art

[0002] At present, an oil seal is a sealing element used for sealing a rotating shaft. The specific structure of an oil seal is disclosed in a Chinese patent with the publication number CN203906798U. The application of oil seals is very extensive, and the sealing requirements for oil seals are different in different application scenarios. For example, an oil seal needs to be installed in a bicycle hub, and the sealing requirement for the oil seal in a bicycle is not very high. Therefore, it is not necessary for the oil seal to have a large shaft holding force. However, the shaft holding force of many existing oil seals is too large, which will cause the contact pressure between the oil seal and the rotating shaft to increase, and then cause severe friction of the oil seal when the rotating shaft rotates, resulting in too fast wear of the oil seal, affecting the service life of the oil seal, and causing the need to frequently replace the oil seal, which is very inconvenient. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a hub oil seal, which can reduce the shaft holding force, thereby reducing wear and extending the service life, and can avoid the inconvenience caused by frequent replacement.

[0004] To solve the above technical problem, the technical solution of the utility model is: a hub oil seal, comprising a sealing body and a skeleton;

[0005] The sealing body includes a body portion, a connecting bridge portion and a sealing lip portion;

[0006] The connecting bridge portion is connected to the inner peripheral portion of the body portion and extends radially inward;

[0007] The sealing lip portion is connected to the inner peripheral portion of the connecting bridge portion;

[0008] The sealing body is provided with a first groove portion above the connecting bridge portion and a second groove portion below the connecting bridge portion;

[0009] The skeleton is embedded in the body portion.

[0010] Further, a specific structure of the sealing lip portion is provided. The sealing lip portion includes a main lip and a sub-lip above the main lip;

[0011] The main lip extends downward and inclines inward from top to bottom;

[0012] The sub-lip extends upward and inclines inward from bottom to top.

[0013] Further, in order to reduce friction, a polytetrafluoroethylene film layer is respectively sprayed on the inner side walls of the main lip and the sub-lip.

[0014] Further, in order to store the grease, a grease cavity for storing the grease is provided between the main lip and the sub-lip.

[0015] Further, the diameter D1 of the lip tip of the main lip is 44.4 mm, and the diameter D2 of the lip tip of the sub-lip is 44.6 mm.

[0016] Further, a specific structure of the body portion is provided. The body portion includes an axially extending portion and a radially extending portion;

[0017] The outer peripheral portion of the radially extending portion is connected to the lower end portion of the axially extending portion;

[0018] The connecting bridge portion is connected to the inner peripheral portion of the radially extending portion and extends radially inward;

[0019] The skeleton is embedded in the axially extending portion and the radially extending portion.

[0020] Further, a specific structure of the skeleton is provided. The skeleton includes an axially extending body and a radially extending body;

[0021] The outer peripheral portion of the radially extending body is connected to the lower end portion of the axially extending body;

[0022] The axially extending body is embedded in the axially extending portion;

[0023] The radially extending body is embedded in the radially extending portion.

[0024] Further, an arc transition connection is provided between the lower end portion of the axially extending body and the outer peripheral portion of the radially extending body.

[0025] Further, the height H of the axially extending portion is 3.2 mm, the outer diameter D3 of the axially extending portion is 52 mm, and the inner diameter D4 of the axially extending body is 49.5 mm.

[0026] Further, the material of the skeleton is stainless steel, and the material of the seal body is rubber.

[0027] After adopting the above technical solution, since the connecting bridge portion extends radially and the first groove portion and the second groove portion are respectively provided above and below the connecting bridge portion, the connecting bridge portion is relatively easy to deform under the action of an external force, and further the supporting force provided by the connecting bridge portion to the sealing lip portion becomes smaller. When the rotating shaft is assembled inside the sealing lip portion, the sealing lip portion will be pushed outwards, and further the connecting bridge portion is deformed under force. At this time, the supporting force provided by the connecting bridge portion to the sealing lip portion is small. Therefore, the holding force of the sealing lip portion on the rotating shaft can be reduced, and further the wear of the sealing lip portion is reduced and the service life is prolonged. When applied to a bicycle hub, the inconvenience caused by frequent replacement can be avoided. Brief Description of the Drawings

[0028] Figure 1 is a schematic structural view of the hub oil seal of the present utility model;

[0029] Figure 2 is Figure 1 a partial detailed view of. Detailed Description of the Preferred Embodiments

[0030] In order to make the content of the present utility model be more clearly understood, the present utility model will be further described in detail below according to specific embodiments in conjunction with the drawings.

[0031] As Figures 1-2 shown, a hub oil seal includes a sealing body 1 and a skeleton 2;

[0032] The sealing body 1 includes a body portion 3, a connecting bridge portion 4 and a sealing lip portion;

[0033] The connecting bridge portion 4 is connected to the inner peripheral portion of the body portion 3 and extends radially inwards;

[0034] The sealing lip portion is connected to the inner peripheral portion of the connecting bridge portion 4;

[0035] The sealing body 1 is provided with a first groove portion 5 above the connecting bridge portion 4 and a second groove portion 6 below the connecting bridge portion 4;

[0036] The skeleton 2 is embedded in the body portion 3. Specifically, since the connecting bridge portion 4 extends radially and the first groove portion 5 and the second groove portion 6 are respectively provided above and below the connecting bridge portion 4, the connecting bridge portion 4 is relatively easy to deform under the action of an external force, and then the supporting force provided by the connecting bridge portion 4 to the sealing lip portion becomes smaller. When the rotating shaft is assembled inside the sealing lip portion, the sealing lip portion will be pushed outwards, and then the connecting bridge portion 4 is deformed by the force. At this time, the supporting force provided by the connecting bridge portion 4 to the sealing lip portion is small. Therefore, the holding force of the sealing lip portion on the rotating shaft can be reduced, and the wear of the sealing lip portion is reduced and the service life is extended. When applied to a bicycle hub, the inconvenience caused by frequent replacement can be avoided.

[0037] As Figures 1-2 shown, the sealing lip portion may include a main lip 7 and a sub-lip 8 located above the main lip 7;

[0038] The main lip 7 extends downwards and inclines inwards from top to bottom;

[0039] The sub-lip 8 extends upwards and inclines inwards from bottom to top.

[0040] In this embodiment, a polytetrafluoroethylene film layer is respectively sprayed on the inner side walls of the main lip 7 and the sub-lip 8 to reduce the friction between the main lip 7 and the rotating shaft and between the sub-lip 8 and the rotating shaft, and further reduce the wear of the main lip 7 and the sub-lip 8.

[0041] As Figures 1-2 shown, a grease cavity 9 for storing grease is provided between the main lip 7 and the sub-lip 8 to further reduce the wear of the main lip 7 and the sub-lip 8.

[0042] As Figures 1-2 shown, the body portion 3 may include an axially extending portion 10 and a radially extending portion 11;

[0043] The outer peripheral portion of the radially extending portion 11 is connected to the lower end portion of the axially extending portion 10;

[0044] The connecting bridge portion 4 is connected to the inner peripheral portion of the radially extending portion 11 and extends radially inwards;

[0045] The skeleton 2 is embedded in the axially extending portion 10 and the radially extending portion 11.

[0046] As Figures 1-2 shown, the skeleton 2 may include an axially extending body 12 and a radially extending body 13;

[0047] The outer peripheral part of the radial body 13 is connected to the lower end part of the axial body 12;

[0048] The axial body 12 is embedded in the axially extending part 10;

[0049] The radial body 13 is embedded in the radially extending part 11; Specifically, there is an arc transition connection between the lower end part of the axial body 12 and the outer peripheral part of the radial body 13.

[0050] In this embodiment, the diameter D1 of the lip tip of the main lip 7 is 44.4 mm, the diameter D2 of the lip tip of the secondary lip 8 is 44.6 mm, the height H of the axially extending part 10 is 3.2 mm, the outer diameter D3 of the axially extending part 10 is 52 mm, and the inner diameter D4 of the axial body 12 is 49.5 mm.

[0051] In this embodiment, the material of the skeleton 2 can be stainless steel, the material of the sealing body 1 can be rubber, and the hub oil seal of the embodiment of the present application can be applied to a bicycle.

[0052] To sum up, since the connecting bridge part 4 extends radially and the first groove part 5 and the second groove part 6 are respectively arranged above and below the connecting bridge part 4, the connecting bridge part 4 is relatively easy to deform under the action of an external force, and further the supporting force provided by the connecting bridge part 4 to the sealing lip part becomes smaller. When the rotating shaft is assembled inside the sealing lip part, it will push the sealing lip part outwards, and further the connecting bridge part 4 is deformed by the force. At this time, the supporting force provided by the connecting bridge part 4 to the sealing lip part is small. Therefore, the clamping force of the sealing lip part on the rotating shaft can be reduced, and further the wear of the sealing lip part is reduced and the service life is prolonged. Applying it to a bicycle hub can avoid the inconvenience caused by frequent replacement.

[0053] In the specific embodiments described above, the technical problems solved, technical solutions and beneficial effects of the present invention are further described in detail. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hub oil seal, characterized in that, It includes a sealing body (1) and a skeleton (2); The sealing body (1) includes a body portion (3), a connecting bridge portion (4) and a sealing lip; The connecting bridge portion (4) is connected to the inner peripheral portion of the body portion (3) and extends radially inward; The sealing lip is connected to the inner peripheral portion of the connecting bridge portion (4); The sealing body (1) is provided with a first groove portion (5) above the connecting bridge portion (4) and a second groove portion (6) below the connecting bridge portion (4); The skeleton (2) is embedded in the body portion (3).

2. The hub oil seal according to claim 1, wherein, The sealing lip includes a main lip (7) and a secondary lip (8) above the main lip (7); The main lip (7) extends downward and inclines inward from top to bottom; The secondary lip (8) extends upward and inclines inward from bottom to top.

3. The hub oil seal according to claim 2, wherein Polytetrafluoroethylene film layers are respectively sprayed on the inner side walls of the main lip (7) and the secondary lip (8).

4. The hub oil seal according to claim 2, characterized in that, A grease cavity (9) for storing grease is provided between the main lip (7) and the secondary lip (8).

5. The hub oil seal according to claim 2, characterized in that, The diameter D1 of the lip tip of the main lip (7) is 44.4 mm, and the diameter D2 of the lip tip of the secondary lip (8) is 44.6 mm.

6. The hub oil seal according to claim 1, characterized in that, The body portion (3) includes an axially extending portion (10) and a radially extending portion (11); The outer peripheral portion of the radially extending portion (11) is connected to the lower end portion of the axially extending portion (10); The connecting bridge portion (4) is connected to the inner peripheral portion of the radially extending portion (11) and extends radially inward; The skeleton (2) is embedded in the axially extending portion (10) and the radially extending portion (11).

7. The hub oil seal according to claim 6, wherein The skeleton (2) includes an axially extending body (12) and a radially extending body (13); The outer peripheral portion of the radially extending body (13) is connected to the lower end portion of the axially extending body (12); The axially extending body (12) is embedded in the axially extending portion (10); The radially extending body (13) is embedded in the radially extending portion (11).

8. The hub oil seal according to claim 7, characterized in that, There is an arc transition connection between the lower end portion of the axially extending body (12) and the outer peripheral portion of the radially extending body (13).

9. The hub oil seal according to claim 7, wherein, The height H of the axially extending portion (10) is 3.2 mm, the outer diameter D3 of the axially extending portion (10) is 52 mm, and the inner diameter D4 of the axially extending body (12) is 49.5 mm.

10. The hub oil seal according to claim 1, characterized in that, The material of the skeleton (2) is stainless steel, and the material of the sealing body (1) is rubber.

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