Agricultural machine hub bearing unit cage oil seal

Abstract

The utility model relates to agricultural wheel hub unit technical field, and disclose a kind of agricultural wheel hub bearing unit framework oil seal, this agricultural wheel hub bearing unit framework oil seal, including outer framework, the outer framework outside closely adheres to wheel hub inner hole inside, outer framework baffle is provided at outer framework one end, and the other end of outer framework is connected in inner sealing lip inside. The agricultural wheel hub bearing unit framework oil seal, in order to make sealing effect better and improve the service life of oil seal body, by being provided with outer framework, inner framework, outer sealing lip, inner sealing lip, outer sealing end face small lip, outer framework baffle, compression spring, cavity and sealing body, to have labyrinth seal effect, and three main lips are designed as 10 ° inclination, both have the resistance ability of strong resistance to external foreign matter, significantly improve the strength and reliability of dustproof function, in turn can make sealing effect better and improve the service life of oil seal body.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery hub unit technology, specifically to an oil seal for the skeleton of an agricultural machinery hub bearing unit. Background Technology

[0002] Existing hub units connected to the plowshare all use a conventional skeleton oil seal at the output end to prevent grease leakage from the inner cavity of the hub unit. However, oil seal leakage is the most common and most likely failure mode of this type of hub unit, which is unacceptable for environmental protection. Once oil seal leakage occurs, the usual remedy is to replace the oil seal, but the failure of the seal will trigger a series of mechanical disassembly operations, which can easily lead to the inability to operate normally for agricultural machinery operating in the field.

[0003] Grease leakage from the oil seals of agricultural machinery hub units is a gradual process. The main influencing factors include working environment, rubber material of the oil seal, structure of the oil seal, and the matching and selection of the oil seal with related elements. Due to the unpredictable working environment of agricultural machinery, improving the reliability and service life of oil seals based on relatively mature rubber materials, the structure of the skeleton oil seal and its matching with related elements become key factors.

[0004] Conventional skeleton oil seals suffer from problems such as a small number of main lips, thin lip thickness, and small compression capacity at the outer lip, making them vulnerable to long-term accumulation and intrusion of external rainwater and silt, which is the main site of oil seal failure. The inner lip of a typical skeleton oil seal usually relies solely on the elasticity of the lip for motion sealing. Due to the thin lip and insufficient compensation for long-term wear, grease leakage often occurs. Regarding the oil seal cavity: conventional skeleton oil seals have small cavity space and short sealing distance, making them prone to failure even with slight intrusion of external foreign objects. In view of this, we propose a skeleton oil seal for agricultural machinery wheel hub bearing units. Utility Model Content

[0005] The purpose of this utility model is to provide an oil seal for the skeleton of an agricultural machinery wheel hub bearing unit to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An oil seal for a hub bearing unit of agricultural machinery includes an outer skeleton, the outer side of which is tightly fitted to the inner hole of the hub. One end of the outer skeleton is provided with an outer skeleton retaining edge, and the other end of the outer skeleton is snapped onto the inner side of an inner sealing lip. The inner skeleton is attached to the outer side of the inner sealing lip, which increases the internal space of the oil seal body cavity. A compression spring is sleeved on the inner side of the inner sealing lip, and the sealing is locked by the compression spring. This non-lip-type sealing structure has reliable clearance compensation and wear compensation, which greatly improves the reliability and service life of the seal. A sealing body is tightly fitted to the outer side of the inner skeleton, and the outer side of the sealing body is tightly fitted to the outer side of the shaft. The sealing body is provided with an outer sealing lip and a small lip on the outer sealing end face. The outer sealing lip and the inner side of the outer skeleton form a cavity, and the outer sealing lip and the outer skeleton are interference-fitted.

[0008] Preferably, the inner skeleton tongue is extended and wedge-shaped in the horizontal direction.

[0009] Preferably, the outer sealing lip is provided in multiple sets, and the outer sealing lip is inclined to the vertical direction.

[0010] Preferably, the cavity is filled with grease. Adding an appropriate amount of grease not only prevents the intrusion of water and fine dust, but also reduces the coefficient of friction between the lip and the skeleton, reduces wear, and extends its service life.

[0011] Preferably, both the outer skeleton and the inner skeleton are made of metal.

[0012] Preferably, the outer sealing lip, inner sealing lip, small lip of the outer sealing end face, outer skeleton edge, and sealing body are all made of rubber.

[0013] Compared with the prior art, this utility model provides an oil seal for the skeleton of an agricultural machinery wheel hub bearing unit, which has the following beneficial effects:

[0014] 1. This agricultural machinery wheel hub bearing unit skeleton oil seal, in order to achieve better sealing effect and extend the service life of the oil seal body, is equipped with an outer skeleton, an inner skeleton, an outer sealing lip, an inner sealing lip, a small lip on the outer sealing end face, an outer skeleton retaining edge, a compression spring, a cavity, and a sealing body, thus achieving a labyrinthine sealing effect. The three main lips are designed with a 10° inclination angle, which not only facilitates assembly but also provides stronger resistance to external foreign objects, significantly improving the strength and reliability of the dustproof function, thereby achieving better sealing effect and extending the service life of the oil seal body.

[0015] 2. In order to further improve the sealing effect, the oil seal of the wheel hub bearing unit skeleton of this agricultural machinery adds appropriate amount of grease between the outer lip and the main lip. This not only prevents the intrusion of water and fine dust, but also reduces the friction coefficient between the lip and the skeleton, reduces the wear of the sealing lip, and extends its working life, thereby further improving the sealing effect. Attached Figure Description

[0016] Figure 1 This is a top view of the overall structure of this utility model;

[0017] Figure 2 This is a partial structural schematic diagram from another perspective of the present invention;

[0018] Figure 3 This is a front sectional view of the overall structure of this utility model;

[0019] Figure 4 This utility model Figure 3 Enlarged structural diagram of region A in the middle;

[0020] Figure 5 This is an exploded cross-sectional view of part of the structure of this utility model;

[0021] Figure 6 This is an exploded view of part of the structure of this utility model.

[0022] In the diagram: 1. Outer skeleton; 2. Inner skeleton; 3. Outer sealing lip; 4. Inner sealing lip; 5. Small lip of outer sealing end face; 6. Outer skeleton retaining edge; 7. Compression spring; 8. Cavity; 9. Sealing body. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1 - Figure 6 This utility model provides a technical solution:

[0025] An oil seal for a hub bearing unit in agricultural machinery includes an outer skeleton 1. The outer skeleton 1 is tightly fitted to the inner hole of the hub. The hub is an existing device and is not shown in the figure. One end of the outer skeleton 1 is provided with an outer skeleton flange 6, and the other end of the outer skeleton 1 is snapped into the inner side of an inner sealing lip 4. An inner skeleton 2 is attached to the outer side of the inner sealing lip 4. Both the outer skeleton 1 and the inner skeleton 2 are made of metal, which increases the internal space of the oil seal body. A compression spring 7 is sleeved on the inner side of the inner sealing lip 4. The non-lip seal structure has reliable gap compensation and wear compensation, which greatly improves the reliability and service life of the seal. A sealing body 9 is tightly fitted to the outer side of the shaft. The shaft is an existing device and is shown in the drawing but not labeled. The sealing body 9 is provided with an outer sealing lip 3 and an outer sealing end face small lip 5. The outer sealing lip 3 and the inner side of the outer frame 1 form a cavity 8. The cavity 8 is filled with grease. Adding an appropriate amount of grease not only prevents the intrusion of water and fine dust, but also reduces the coefficient of friction between the lip and the frame, reduces the degree of wear, and extends its working life. The outer sealing lip 3 and the outer frame 1 are interference fit. The outer sealing lip 3, inner sealing lip 4, outer sealing end face small lip 5, outer frame retaining edge 6 and sealing body 9 are all made of rubber.

[0026] In one embodiment of this utility model, the tongue of the inner skeleton 2 is extended and set in a wedge shape in the horizontal direction, and is designed as a 25° wedge shape for easy assembly.

[0027] In one embodiment of this utility model, the outer sealing lip 3 is provided in three sets, and the outer sealing lip 3 is inclined to the vertical direction at an angle of 10°, which is conducive to assembly and has a stronger resistance to external foreign objects, thus significantly improving the strength and reliability of the dustproof function.

[0028] In use: The oil seal as a whole increases the sealing cavity space. The tongue of the inner skeleton 2 is extended and designed as a 25° wedge shape for easy assembly. The outer skeleton 1 is interference-fitted with the inner diameter D of the hub inner hole, and the sealing body 9 is interference-fitted with the outer diameter d of the shaft. The outer sealing lip 3 is inclined to the vertical direction at a 10° angle, which is conducive to assembly and significantly improves the strength and reliability of the dustproof function. An appropriate amount of grease is filled between the lips. When the inner skeleton 2 is pressed in, it lifts the inner sealing lip 4 to form an elastic seal. The compression spring 7 is set inside the inner sealing lip 4, thereby forming a reliable seal with the inner skeleton 2. It has reliable gap compensation and wear compensation, which greatly improves the reliability and service life of the inner lip seal, enhances the overall sealing reliability, extends the service life of the oil seal, and reduces the sealing failure rate.

[0029] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A type of oil seal for the skeleton of an agricultural machinery wheel hub bearing unit, characterized in that: The system includes an outer frame (1), the outer frame (1) being tightly fitted to the inner hole of the hub, an outer frame retainer (6) being provided at one end of the outer frame (1), and the other end of the outer frame (1) being snapped into the inner side of the inner sealing lip (4). An inner frame (2) is attached to the outer side of the inner sealing lip (4), and a compression spring (7) is sleeved on the inner side of the inner sealing lip (4). A sealing body (9) is tightly fitted to the outer side of the inner frame (2), and the outer side of the sealing body (9) is tightly fitted to the outer side of the shaft. An outer sealing lip (3) and a small lip (5) on the outer sealing end face are provided on the sealing body (9). The outer sealing lip (3) and the inner side of the outer frame (1) form a cavity (8), and the outer sealing lip (3) and the outer frame (1) are interference-fitted.

2. The oil seal for the skeleton of an agricultural machinery wheel hub bearing unit according to claim 1, characterized in that: The tongue of the endoskeleton (2) is extended and set in a wedge shape in the horizontal direction.

3. The oil seal for the skeleton of an agricultural machinery wheel hub bearing unit according to claim 1, characterized in that: The outer sealing lip (3) is provided in multiple sets, and the outer sealing lip (3) is inclined to the vertical direction.

4. The oil seal for the skeleton of an agricultural machinery wheel hub bearing unit according to claim 1, characterized in that: The cavity (8) is filled with grease.

5. The oil seal for the skeleton of an agricultural machinery wheel hub bearing unit according to claim 1, characterized in that: Both the outer frame (1) and the inner frame (2) are made of metal. The outer frame (1) is interference-fitted with the inner diameter D of the hub hole, and the sealing body (9) is interference-fitted with the outer diameter d of the shaft.

6. The oil seal for the skeleton of an agricultural machinery wheel hub bearing unit according to claim 1, characterized in that: The outer sealing lip (3), inner sealing lip (4), small lip on the outer sealing end face (5), outer skeleton edge (6), and sealing body (9) are all made of rubber.

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