Multi-sealing grease lubrication hub unit oil seal

Abstract

The utility model relates to a multi-sealing grease lubrication hub unit oil seal which comprises an outer oil seal and an inner oil seal, the inner oil seal and the outer oil seal are combined with each other, the inner oil seal comprises an inner framework, a framework folding surface is arranged on the inner framework, the outer oil seal is limited in the axial direction by the framework folding surface, a first rubber body is arranged on the right side of the inner framework, and a second rubber body is arranged on the right side of the inner framework. The outer oil seal comprises an outer framework, a second rubber body is installed on the left side of the outer framework and covers the left face, the lower face and the right face of the outer framework, a radial auxiliary lip is arranged in the radial direction of the second rubber body, and the radial auxiliary lip is in interference fit with the inner framework. A plurality of axial auxiliary lips are arranged in the axial direction of the second rubber body and are in interference fit with the inner framework. By the adoption of the technical scheme, muddy water can be effectively prevented from entering a machine, the muddy water prevention performance of mechanical parts can be effectively improved, meanwhile, the turnover face of the inner framework can enable the outer oil seal to be limited in a fixed area to move, and the reliability of the oil seal is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil seals, in particular to a multi-sealing grease lubricated wheel hub unit oil seal. Background Art

[0002] Anti-mud and water oil seal is a sealing ring that can adapt to muddy and water working conditions. Anti-mud and water oil seal is of great significance. It can not only seal the lubricating oil inside the machine but also prevent the mud and water outside the machine from entering the machine. If the mud and water in the external environment enter the oil seal, the lubricating oil sealing structure will also be corroded and worn by the mud and water and fail. The overall function of the oil seal will no longer exist and the mechanical parts will be easily damaged.

[0003] There are many common oil seals on the market, but there are few oil seals with good mud and water resistance. In a harsh muddy working environment, the inner and outer oil seals are easy to move out of place, resulting in oil seal failure. Mud and water can also easily penetrate the common oil seals into the bearing cavity of mechanical equipment, causing the shaft to rust or even seriously wear, resulting in mechanical failures and seriously reducing the service life of mechanical equipment.

[0004] Therefore, it is very necessary to research and develop an oil seal that can effectively improve the reliability and durability of the oil seal against mud and water and has excellent assembly performance. Summary of the invention

[0005] The utility model aims to provide a hub unit oil seal with multiple sealing grease lubrication that can adapt to severe muddy and water working conditions, aiming to solve the problems of insufficient reliability and durability of existing muddy and water-proof oil seals.

[0006] The technical solution adopted by the utility model is: a multi-sealing grease lubricated hub unit oil seal, comprising an outer oil seal and an inner oil seal, the inner oil seal and the outer oil seal are combined with each other, the inner oil seal comprises an inner skeleton, a skeleton folding surface is arranged on the inner skeleton, the skeleton folding surface limits the outer oil seal in the axial direction, a first rubber body is installed on the right side of the inner skeleton, the first rubber body is interference fit with the shaft, the outer oil seal comprises an outer skeleton, a second rubber body is installed on the left side of the outer skeleton, the second rubber body covers the left side, the bottom and the right side of the outer skeleton, a radial auxiliary lip is arranged in the radial direction of the second rubber body, the radial auxiliary lip is interference fit with the inner skeleton, a plurality of axial auxiliary lips are arranged in the axial direction of the second rubber body, the axial auxiliary lips are interference fit with the inner skeleton.

[0007] A further technical solution of the utility model is: a supporting portion is also provided on the second rubber body, the supporting portion is located on the left side of the radial auxiliary lip, the supporting portion is supported by the inner skeleton, and the supporting portion is the connecting portion when the inner oil seal and the outer oil seal rotate relative to each other, which can not only ensure the axial distance between the inner and outer oil seals, but also prevent dust, mud and water from entering the interior of the oil seal.

[0008] The beneficial effect of the utility model is that due to the adoption of the above-mentioned technical scheme, a multi-sealing grease lubricated hub unit oil seal of the utility model can effectively prevent mud and water from entering the inside of the machine when the oil seal is working in a harsh muddy and watery working environment, can effectively improve the mud and water proof performance of mechanical parts, and extend the service life of the machine. At the same time, the folding surface of the inner skeleton can limit the movement of the outer oil seal to a fixed area, so as to prevent oil seal failure caused by assembly failure or axial movement, and improve the reliability of the oil seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of a hub unit oil seal lubricated with multiple sealing greases described in the utility model. DETAILED DESCRIPTION

[0010] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0011] Example:

[0012] like Figure 1 The shown is a multiple sealing grease lubricated hub unit oil seal, a multiple sealing grease lubricated hub unit oil seal, including an outer oil seal and an inner oil seal, the inner oil seal and the outer oil seal are combined with each other, the outer oil seal and the inner oil seal rotate relatively when the machine is working, the inner oil seal includes an inner skeleton 12, the inner skeleton is provided with a skeleton folding surface 13, the folding angle is 90°, the skeleton folding surface 13 limits the outer oil seal in the axial direction, so that the outer oil seal moves in a fixed area to prevent assembly failure or axial movement caused by oil seal failure, a first rubber body 11 is installed on the right side of the inner skeleton, The first rubber body is interference fit with the shaft 3, and the outer oil seal includes an outer skeleton 22. A second rubber body 21 is installed on the left side of the outer skeleton. The second rubber body covers the left side, the bottom and the right side of the outer skeleton. A radial auxiliary lip 24 is provided in the radial direction of the second rubber body. The radial auxiliary lip 24 is interference fit with the inner skeleton 12 to prevent dust. A plurality of axial auxiliary lips 25 are provided in the axial direction of the second rubber body 21. The axial auxiliary lips 25 are interference fit with the inner skeleton 12. The multiple sealing structures effectively prevent external dust, mud and water from entering the interior of the oil seal.

[0013] Furthermore, a support portion 23 is provided on the second rubber body, and the support portion is located on the left side of the radial auxiliary lip. The support portion is supported by the inner skeleton, and the support portion is the connection portion when the inner oil seal and the outer oil seal rotate relative to each other, which can not only ensure the axial distance between the inner and outer oil seals, but also prevent dust, mud and water from entering the interior of the oil seal.

[0014] The oil seal described in the technical solution effectively improves the reliability and durability of mud and water resistance by improving the shape structure of the oil seal rubber body. It has a simple structure and excellent assembly performance.

[0015] In the description of this application, it should be understood that if the terms "left", "right", "up", "down", etc. indicate directions or positional relationships, they are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it cannot be understood as a limitation on this application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0016] 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 multi-sealing grease lubricated wheel hub unit oil seal, characterized in that: It includes an outer oil seal and an inner oil seal, which are combined with each other. The inner oil seal includes an inner skeleton, and a skeleton folding surface is provided on the inner skeleton. The skeleton folding surface limits the outer oil seal in the axial direction. A first rubber body is installed on the right side of the inner skeleton, and the first rubber body is interference fit with the shaft. The outer oil seal includes an outer skeleton, and a second rubber body is installed on the left side of the outer skeleton. The second rubber body covers the left side, the bottom and the right side of the outer skeleton. A radial auxiliary lip is provided in the radial direction of the second rubber body, and the radial auxiliary lip is interference fit with the inner skeleton. A plurality of axial auxiliary lips are provided in the axial direction of the second rubber body, and the axial auxiliary lips are interference fit with the inner skeleton.

2. The multi-sealing grease lubricated hub unit oil seal according to claim 1, characterized in that: The second rubber body is also provided with a support portion, which is located on the left side of the radial auxiliary lip and is supported by the inner frame.

Images