High-protection grease lubrication box type hub oil seal

Abstract

The utility model relates to a high protection grease lubrication box type hub oil seal which comprises an outer oil seal and an inner oil seal, the outer oil seal comprises an outer framework, the inner oil seal comprises an inner framework, a first rubber body is installed on the outer framework, and a first radial auxiliary lip, a second radial auxiliary lip and a third radial auxiliary lip are sequentially arranged on the right side face of the first rubber body. The first radial auxiliary lip, the second radial auxiliary lip and the third radial auxiliary lip are in interference fit with the inner framework, and an axial auxiliary lip is arranged below the right side of the first rubber body and abuts against the inner framework. The space between the first radial auxiliary lip and the second radial auxiliary lip, the space between the second radial auxiliary lip and the third radial auxiliary lip and the space between the third radial auxiliary lip and the axial auxiliary lip are filled with lubricating grease respectively, a second rubber body is installed on the inner framework, and the second rubber body is in interference fit with the shaft. By the adoption of the technical scheme, the oil seal can adapt to the severe working environment, has the stable lubricating grease sealing performance and also has the extremely high muddy water preventing performance.

Description

Technical Field

[0001] The utility model relates to the technical field of oil seals, in particular to a high-protection grease lubricating box-type wheel hub oil seal. Background Art

[0002] With the development of modern machinery and the complexity of the operating environment, high-protection wheel hub oil seals have become a common requirement in the market. As a part of them, grease-lubricated wheel hub oil seals also need to have higher protection requirements. However, most of the current wheel hub oil seals are ordinary oil seals. Although they can meet the sealing requirements under normal conditions, when facing harsh working environments, ordinary wheel hub oil seals cannot provide effective and reliable sealing performance, resulting in the machinery being easily penetrated by mud and water when working in harsh and complex working environments, affecting the normal performance and life of the machinery. Summary of the invention

[0003] The utility model aims to provide a high-protection grease-lubricated box-type wheel hub oil seal that can adapt to harsh working environments, aiming to solve the problems of insufficient sealing performance and insufficient reliability of existing wheel hub oil seals in harsh working environments.

[0004] The technical solution adopted by the utility model is: a high-protection grease lubrication box-type wheel hub oil seal, including an outer oil seal and an inner oil seal, the outer oil seal includes an outer frame, the inner oil seal includes an inner frame, the outer frame and the inner frame are combined to form a labyrinth space between the outer frame and the inner frame, a first rubber body is installed on the outer frame, the upper left side surface of the first rubber body is an assembly guide part, the assembly guide part and the shell body are clearance-matched, the middle left side surface of the first rubber body is an outer diameter sealing surface, a plurality of annular protrusions are arranged on the outer diameter sealing surface, the outer diameter sealing surface and the shell body are interference-fitted, and a downwardly protruding support part is arranged at the lower part of the first rubber body, The supporting portion abuts against the inner skeleton, and a first radial auxiliary lip, a second radial auxiliary lip, and a third radial auxiliary lip are sequentially arranged on the right side surface of the first rubber body, and the first radial auxiliary lip, the second radial auxiliary lip, and the third radial auxiliary lip are respectively interference fit with the inner skeleton. An axial auxiliary lip is arranged at the lower right side of the first rubber body, and the axial auxiliary lip abuts against the inner skeleton, and the space between the first radial auxiliary lip and the second radial auxiliary lip, the space between the second radial auxiliary lip and the third radial auxiliary lip, and the space between the third radial auxiliary lip and the axial auxiliary lip are respectively filled with grease, and a second rubber body is installed on the inner skeleton, and the second rubber body is interference fit with the shaft.

[0005] A further technical solution of the utility model is that a dustproof part is arranged at the lower part of the left side surface of the first rubber body to prevent the invasion of large particles of external impurities.

[0006] The beneficial effect of the utility model is that due to the adoption of the above technical scheme, the high-protection grease lubrication box-type wheel hub oil seal of the utility model can adapt to harsh working environments, and has both stable sealing grease performance and extremely high mud and water resistance performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 The utility model is a structural schematic diagram of a high-protection grease lubrication box-type wheel hub oil seal. 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 high-protection grease-lubricated cassette wheel hub oil seal shown in the figure comprises an outer oil seal and an inner oil seal, wherein the outer oil seal comprises an outer skeleton 13, and the inner oil seal comprises an inner skeleton 21, and the inner skeleton is in an "L" shape. The outer skeleton and the inner skeleton are combined with each other so that a labyrinth-like space is formed between the outer skeleton and the inner skeleton, and a first rubber body is installed on the outer skeleton 13, and the upper part of the left side surface of the first rubber body is an assembly guide portion 11, and the assembly guide portion is clearance-matched with the shell body to play an assembly guide role, and the middle part of the left side surface of the first rubber body is an outer diameter sealing surface 12, and a plurality of annular protrusions are arranged on the outer diameter sealing surface, and the outer diameter sealing surface is interference-fitted with the shell body to play a static sealing role, and a downwardly protruding support portion 15 is arranged at the lower part of the first rubber body, and the support portion abuts against the inner skeleton 21, and the support portion is the connection portion between the outer oil seal and the inner oil seal when they rotate relative to each other, which can not only ensure the axial distance between the inner and outer oil seals, but also play a role in preventing The first rubber body is provided with a first radial auxiliary lip 17, a second radial auxiliary lip 18 and a third radial auxiliary lip 19 on the right side thereof in sequence, and the first radial auxiliary lip, the second radial auxiliary lip and the third radial auxiliary lip are respectively interference fit with the inner skeleton 21 to prevent external dust, mud and water from entering the inner part of the oil seal. The axial surface of the inner skeleton is interference fit with the first radial auxiliary lip, the second radial auxiliary lip and the third radial auxiliary lip to realize dynamic sealing. An axial auxiliary lip 16 is provided at the lower right side of the first rubber body, and the axial auxiliary lip abuts against the inner skeleton 21. The space between the first radial auxiliary lip and the second radial auxiliary lip, the space between the second radial auxiliary lip and the third radial auxiliary lip, and the space between the third radial auxiliary lip and the axial auxiliary lip are respectively filled with grease 31. The second rubber body 22 is installed on the inner skeleton, and the second rubber body is interference fit with the shaft to ensure static sealing with the shaft.

[0011] Furthermore, a dustproof portion 14 is provided at the lower portion of the left side surface of the first rubber body to prevent the invasion of large particles of foreign matter from outside.

[0012] In the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[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 high protection grease lubricated cassette wheel hub oil seal, characterized in that: The invention comprises an outer oil seal and an inner oil seal, wherein the outer oil seal comprises an outer frame, and the inner oil seal comprises an inner frame, and the outer frame and the inner frame are combined with each other so that a labyrinth-like space is formed between the outer frame and the inner frame, and a first rubber body is installed on the outer frame, and an upper portion of the left side surface of the first rubber body is an assembly guide portion, and the assembly guide portion is clearance-matched with a shell body, and a middle portion of the left side surface of the first rubber body is an outer diameter sealing surface, and a plurality of annular protrusions are arranged on the outer diameter sealing surface, and the outer diameter sealing surface is interference-fitted with the shell body, and a downwardly protruding support portion is arranged at the lower portion of the first rubber body, and the support portion contacts the inner frame, and the first A first radial auxiliary lip, a second radial auxiliary lip, and a third radial auxiliary lip are sequentially arranged on the right side surface of the rubber body, and the first radial auxiliary lip, the second radial auxiliary lip, and the third radial auxiliary lip are respectively interference fit with the inner skeleton. An axial auxiliary lip is arranged at the lower right side of the first rubber body, and the axial auxiliary lip abuts against the inner skeleton. The space between the first radial auxiliary lip and the second radial auxiliary lip, the space between the second radial auxiliary lip and the third radial auxiliary lip, and the space between the third radial auxiliary lip and the axial auxiliary lip are respectively filled with grease. A second rubber body is installed on the inner skeleton, and the second rubber body is interference fit with the shaft.

2. A high protection grease lubrication cassette wheel hub oil seal according to claim 1, characterized in that: A dustproof portion is disposed at the lower portion of the left side surface of the first rubber body.

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