Hub oil seal with long service life

Abstract

The utility model relates to a long-life hub oil seal which comprises an outer oil seal and an inner oil seal, the outer oil seal is assembled on a mounting shell, the outer oil seal is a single outer supporting framework, the section of the outer supporting framework is Z-shaped, the inner oil seal comprises an inner supporting framework and a rubber body, N air holes are formed in the upper end face of the inner supporting framework, N is larger than or equal to 3, and N is larger than or equal to 3. The rubber body is fixedly installed on the inner supporting framework, a plurality of arc-shaped protruding sealing ribs are arranged on the inner side of the rubber body, the sealing ribs are in interference fit with the shaft, a first sealing lip is arranged on the outer side of the upper middle portion of the rubber body, and a second sealing lip and a third sealing lip are arranged on the outer side of the lower middle portion of the rubber body. By the adoption of the technical scheme, the heat dissipation effect is enhanced while the sealing performance is guaranteed, spring components are reduced, so that radial friction force is reduced, temperature rise is reduced, and the service life of the oil seal is longer.

Description

Technical Field

[0001] The utility model relates to the technical field of oil seals, in particular to a long-life wheel hub oil seal. Background Art

[0002] The axle wheel hub oil seal is one of the important sealing parts in the chassis system. Most OEMs use the original single oil seal structure, including a rubber body, a support frame and an oil seal spring. The support frame used is L-shaped and relatively simple. The oil seal spring is radially confined to the lip position of the rubber body, resulting in excessive radial force, excessive friction temperature rise, and lubricating oil consumption, which eventually leads to oil seal failure and affects the life of the wheel hub. Summary of the invention

[0003] The utility model aims to provide a long-life wheel hub oil seal, aiming to solve the problem that the existing wheel hub oil seal has too large radial force, resulting in excessive friction temperature rise and lubricating oil consumption, which leads to a short service life of the wheel hub.

[0004] The technical solution adopted by the utility model is: a long-life wheel hub oil seal, comprising an outer oil seal and an inner oil seal, the outer oil seal is assembled on the mounting shell, the outer oil seal is a single outer support skeleton, the cross-section of the outer support skeleton is "ㄣ"-shaped, the outer diameter surface of the outer support skeleton is interference-sealed with the shell, the inner oil seal comprises the inner support skeleton and a rubber body, the upper end surface of the inner support skeleton is provided with N air vents, N≥3, the rubber body is fixedly mounted on the inner support skeleton, the inner side of the rubber body is provided with a plurality of arc-shaped raised sealing ribs, the sealing ribs are interference-fitted with the shaft, a first sealing lip is arranged on the outer side of the middle and upper part of the rubber body, the first sealing lip is interference-fitted with the inner diameter surface of the upper half of the outer support skeleton, the space below the first sealing lip is filled with grease, a second sealing lip and a third sealing lip are arranged on the outer side of the middle and lower part of the rubber body, the second sealing lip and the third sealing lip are respectively interference-fitted with the inner diameter surface of the lower half of the outer support skeleton.

[0005] A further technical solution of the utility model is that the rubber body is made of high and low temperature resistant hydrogenated nitrile material, which reduces the friction coefficient of the rubber body and reduces the friction between the rubber body and the external support frame and the shaft.

[0006] The beneficial effect of the utility model is that due to the adoption of the above technical scheme, a long-life wheel hub oil seal of the utility model can enhance the heat dissipation effect while ensuring the sealing performance, reduce the spring components to reduce the radial friction and reduce the temperature rise, so that the service life of the oil seal is longer. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 The utility model is a schematic diagram of a long-life wheel hub oil seal structure. DETAILED DESCRIPTION

[0008] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0009] Example:

[0010] like Figure 1 A long-life wheel hub oil seal shown in the figure comprises an outer oil seal and an inner oil seal. The outer oil seal is assembled on the mounting shell. The outer oil seal is a single outer support skeleton 1. The cross-section of the outer support skeleton is "ㄣ"-shaped. The outer diameter surface of the outer support skeleton 1 is interference-sealed with the shell. The outer oil seal and the mounting shell are assembled by interference fitting to achieve a sealing effect. The outer oil seal is arranged to be composed of a single outer support skeleton, which is a metal part without a complicated rubber wrapping on the outside, which is beneficial to improving the heat dissipation effect; the inner oil seal comprises an inner support skeleton 5 and a rubber body 6. N air holes 4 are arranged on the upper end surface of the inner support skeleton, N ≥ 3, and the air holes are evenly distributed on the upper end surface of the inner support skeleton. The air holes can avoid the formation of a vacuum between the inner and outer oil seals and can also play an observation role. The rubber body is directly fixed on the inner support skeleton to reduce the oil seal spring component, thereby reducing the radial friction and reducing the temperature rise. The inner side of the rubber body (the "inside" here refers to Figure 1 The outer side of the middle upper part of the rubber body (the outer side here refers to the outer side of the middle upper part of the rubber body) is provided with a plurality of arc-shaped raised sealing ribs 61, which are interference-fitted with the shaft and rotate simultaneously with the shaft. Figure 1 The first sealing lip 2 is provided with an interference fit with the inner diameter surface of the upper half of the outer support frame. The space below the first sealing lip is filled with grease 3 to lubricate and prevent dry friction with the outer oil seal. The outer side of the middle and lower part of the rubber body (the "outer side" here refers to Figure 1 A second sealing lip 7 and a third sealing lip 8 are provided (in the left direction in the figure), and the second sealing lip and the third sealing lip are respectively interference fit with the inner diameter surface of the lower half of the outer support frame.

[0011] Furthermore, the rubber body is made of high and low temperature resistant hydrogenated nitrile material, which can reduce the friction coefficient of the rubber body and reduce the friction between the rubber body and the external support frame and the shaft.

[0012] For ease of understanding, it is necessary to explain that Figure 1 In the diagram, the upper side of the graphic is the dust-proof side, and the lower side of the graphic is the oil-sealed side.

[0013] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A long-life wheel hub oil seal, comprising an outer oil seal and an inner oil seal, wherein the outer oil seal is assembled on a mounting housing, and is characterized in that: The outer oil seal is a single outer support skeleton, the cross-section of the outer support skeleton is "ㄣ"-shaped, the outer diameter surface of the outer support skeleton is interference-sealed with the shell, the inner oil seal includes an inner support skeleton and a rubber body, the upper end surface of the inner support skeleton is provided with N air holes, N ≥ 3, the rubber body is fixedly mounted on the inner support skeleton, the inner side of the rubber body is provided with a plurality of arc-shaped raised sealing ribs, the sealing ribs are interference-fitted with the shaft, a first sealing lip is provided on the outer side of the middle and upper part of the rubber body, the first sealing lip is interference-fitted with the inner diameter surface of the upper half of the outer support skeleton, the space below the first sealing lip is filled with grease, a second sealing lip and a third sealing lip are provided on the outer side of the middle and lower part of the rubber body, the second sealing lip and the third sealing lip are interference-fitted with the inner diameter surface of the lower half of the outer support skeleton respectively.

2. A long-life wheel hub oil seal according to claim 1, characterized in that: The rubber body is made of hydrogenated nitrile material.

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