A double-lip multi-protection combined sealing device for a harrow wheel hub bearing

Abstract

The utility model discloses a double -lipped type multiple protection combination sealing device for harrow piece hub bearing mainly includes spindle, bearing end cover with convex disc part and shell with step surface, and the annular accommodating cavity is formed between the two, and the sealing assembly is located in the cavity, is composed of first sealing main body, first and second support framework, the first support framework is attached to shell step surface, the second support framework is attached to end cover convex disc part, and first sealing main body is equipped with double sealing lip, and the lip contains support spring respectively, and the common constitution is closely attached double -lipped sealing structure, has multiple protection and high sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, specifically to a double-lip type multi-protection combined sealing device for rake blade hub bearings. Background Technology

[0002] In modern mechanical transmission systems, the sealing performance of wheel hub bearings is crucial, especially under harsh operating conditions, such as those in agricultural machinery like harrow blade wheel hub bearings. Traditional wheel hub bearing sealing devices often employ a single-lip seal structure. This structure has limited sealing effectiveness against impurities such as dust and mud, easily allowing these contaminants to enter the bearing, leading to lubrication failure and premature bearing damage. Furthermore, during long-term operation, the sealing performance of a single-lip seal gradually declines due to wear of the sealing lip, failing to effectively prevent the intrusion of external contaminants and the loss of internal lubricating grease. Therefore, designing a sealing device with multiple protective functions to improve the sealing reliability of wheel hub bearings and extend their service life has become a pressing technical problem for the industry. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this utility model relates to a double-lip type multi-protection combined sealing device for rake blade hub bearings. This structure is simple and reliable, effectively solving the aforementioned technical problems and is suitable for widespread use. To achieve the above objectives, this utility model is implemented through the following technical solution:

[0004] A double-lip type multi-protection combined seal device for rake blade hub bearings, comprising:

[0005] spindle;

[0006] A bearing end cap fitted onto the front end of the spindle, the bearing end cap having a cylindrical base and a radially outwardly protruding cam portion located at the front end of the base;

[0007] The outer housing is coaxially fitted outside the main shaft, and its front end inner hole has a stepped surface that extends radially inward;

[0008] An annular receiving cavity is formed between the convex portion of the bearing end cover and the stepped surface of the outer housing, and the receiving cavity is connected to the bearing mounting area between the main shaft and the outer housing.

[0009] A sealing assembly is disposed within the receiving cavity. The sealing assembly includes a first sealing body, a first support frame, a second support frame, a first annular support spring, and a second annular support spring. The first support frame has a U-shaped segment and a straight extension segment. The U-shaped segment fits tightly against the stepped surface of the outer shell. One end of the U-shaped segment bends and extends towards the main shaft to form a straight extension segment, which is perpendicular to the axis of the main shaft. The second support frame has a U-shaped structure and is fitted onto the outside of the convex portion of the bearing end cover and fits tightly against it. The first sealing body has a groove that matches the straight extension segment. The first sealing body also has a first sealing lip and a second sealing lip. The first sealing lip and the second sealing lip are symmetrically arranged on both sides of the groove and fit against the second support frame. A first annular support spring is disposed inside the lip of the first sealing lip, and a second annular support spring is disposed inside the lip of the second sealing lip.

[0010] Based on the above solution and as a preferred embodiment of the above solution: the sealing assembly further includes a second sealing body, the second sealing body having a limiting groove that mates with the port of the second support frame, the second sealing body being pressed and fitted against the inner surface of the convex portion of the bearing end cover by the second support frame, a channel being formed between the first support frame and the second support frame, and a protruding rib being provided on the outer side of the second sealing body, the protruding rib being used to block the channel.

[0011] Based on the above scheme and as a preferred embodiment of the above scheme: there are several protruding ribs, and the several protruding ribs are spaced apart along the length direction of the second sealing body.

[0012] Based on the above scheme and as a preferred embodiment of the above scheme: a bearing inner ring is provided in the bearing mounting area, the front surface of the bearing inner ring abuts against the bearing end cover, the outer diameter of the bearing inner ring is larger than the outer diameter of the base of the bearing end cover, and one end of the second support frame contacts the end face of the bearing inner ring.

[0013] The outstanding and beneficial technical effects of this utility model compared with the prior art are: it constitutes a gradient progressive sealing structure, the sealing strength increases from the outside to the inside, the wear risk of a single sealing surface is dispersed to multiple levels, and the wear that was originally concentrated on a single sealing surface is absorbed by multiple levels in a coordinated manner. The double lip design provides two independent sealing barriers, with the first lip and the second lip undertaking different sealing tasks respectively. The first lip primarily blocks the intrusion of external contaminants, while the second lip further prevents leakage of internal lubricating oil, forming a dual protection mechanism that significantly improves the reliability of the seal. The double-lip design can adapt to minor shaft eccentricity and vibration. Even if a certain degree of eccentricity or vibration occurs during spindle operation, the double lips can still maintain good sealing contact, ensuring that the sealing effect is not affected. The first and second lips are respectively equipped with a first annular support spring and a second annular support spring. These springs not only provide stable radial clamping force for the lips, but also effectively compensate for lip wear, ensuring the stability of the sealing contact. The elastic compensation effect of the springs further improves the adaptability and reliability of the sealing device, enabling it to maintain good sealing performance during long-term operation. Moreover, the spring-supported double-lip design can compensate for changes caused by thermal expansion in real time during dynamic operation, ensuring the continuity and stability of the sealing contact. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the inside of the bearing;

[0015] Figure 2 This is a 3D schematic diagram of the bearing. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. However, the specific implementation methods and embodiments described below are for illustrative purposes only and are not intended to limit the present invention.

[0017] In the description of this utility model, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The directions or positional relationships shown are for the purpose of describing this utility model only, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] In the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0019] To solve the above technical problems, such as Figure 1-2 As shown, this utility model designs a double-lip type multi-protection combined sealing device for rake blade hub bearings, including a main shaft 1; a bearing end cover 2 sleeved on the front end of the main shaft 1, the bearing end cover 2 having a cylindrical base 21 and a radially outwardly protruding convex portion 22 at the front end of the base 21; an outer housing 3 coaxially sleeved on the main shaft 1, the inner hole of which has a radially inwardly extending stepped surface; an annular receiving cavity 11 is formed between the convex portion 22 of the bearing end cover 2 and the stepped surface of the outer housing 3, the receiving cavity 11 communicating with the bearing mounting area 12 between the main shaft 1 and the outer housing 3; a sealing assembly disposed in the receiving cavity 11, the sealing assembly including a first sealing body 4, a first support frame 5, a second support frame 6, a first annular support spring 7, and a second annular support spring 8, the first support frame 5 having a U-shaped section 51 and a straight extension section 52, the U-shaped section 51 being... At the stepped surface of the outer shell 3, and in close contact with the outer shell 3, one end of the U-shaped segment 51 bends and extends towards the main shaft 1 to form a straight extension segment 52. The straight extension segment 52 is perpendicular to the axis of the main shaft 1. The second support frame 6 has a U-shaped structure and is fitted on the outside of the convex portion 22 of the bearing end cover 2 and is in close contact with it. The first sealing body 4 is provided with a groove 43 that is adapted to the straight extension segment 52. The first sealing body 4 is also provided with a first sealing lip 41 and a second sealing lip 42. The first sealing lip 41 and the second sealing lip 42 are symmetrically arranged on both sides of the groove 43 and are in close contact with the second support frame 6. A first annular support spring 7 is provided in the lip opening of the first sealing lip 41, and a second annular support spring 8 is provided in the lip opening of the second sealing lip 42. The first sealing lip 41 and the second sealing lip 42 are symmetrically arranged to form a double sealing barrier. The first sealing lip 41 primarily blocks the intrusion of external contaminants, while the second sealing lip 42 further prevents leakage of internal lubricating oil, ensuring a double guarantee of sealing effect. The radial clamping force applied by the spring to the sealing lip ensures that the sealing lip and the shaft always maintain a tight contact. This clamping force can be appropriately adjusted according to the working conditions, ensuring the sealing effect while avoiding excessive wear of the lip due to excessive clamping force. The double-lip design not only provides a double sealing barrier, but also ensures the reliability and stability of the sealing device under complex working conditions through advantages such as low radial force, high surface roughness tolerance, low wear and erosion risk, thermal expansion compensation capability, good dynamic sealing performance, and effective prevention of lubricating oil leakage.

[0020] In this embodiment, it is further preferred that the sealing assembly also includes a second sealing body 9. The second sealing body 9 has a limiting groove 92 that mates with the port of the second support frame 6. The second sealing body 9 is pressed tightly against the inner surface of the convex portion 22 of the bearing end cover 2 by the second support frame 6, ensuring that the second sealing body 9 will not be displaced or loosened during operation. Even under high vibration and frequent start-stop conditions, the second sealing body 9 can still maintain a tight fit, preventing sealing failure due to loosening.

[0021] A channel is formed between the first support frame 5 and the second support frame 6. The outer side of the second sealing body 9 is provided with a protruding rib 91. The protruding rib 91 directly blocks the channel formed between the first support frame 5 and the second support frame 6 through its physical structure. This physical blocking effect effectively prevents external impurities (such as dust, mud, particles, etc.) from entering the bearing through the channel, which significantly improves the sealing protection capability.

[0022] In this embodiment, it is further preferred that there are several protruding ribs 91, and the several protruding ribs 91 are spaced apart along the length direction of the second sealing body 9 to form a gradient progressive sealing structure. The sealing strength increases from the outside to the inside, which disperses the wear risk of a single sealing surface to multiple levels, so that the wear originally concentrated on a single sealing surface is absorbed by multiple levels in a coordinated manner.

[0023] In this embodiment, it is further preferred that a bearing inner ring 10 is provided in the bearing mounting area 12, the front surface of the bearing inner ring 10 abuts against the bearing end cover 2, the outer diameter of the bearing inner ring 10 is larger than the outer diameter of the base 21 of the bearing end cover 2, and one end of the second support frame 6 contacts the end face of the bearing inner ring 10, so that the bearing inner ring 10 plays an important supporting role during assembly, providing a stable fulcrum for the second support frame 6, ensuring that it always maintains a stable position and posture, and the second support frame 6 can obtain a stable supporting force, thereby avoiding displacement caused by vibration, impact or other external forces.

[0024] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made by those skilled in the art based on the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A double-lip type multi-protection combined sealing device for rake blade hub bearings, characterized in that: include spindle; A bearing end cap fitted onto the front end of the spindle, the bearing end cap having a cylindrical base and a radially outwardly protruding cam portion located at the front end of the base; The outer housing is coaxially fitted outside the main shaft, and its front end inner hole has a stepped surface that extends radially inward; An annular receiving cavity is formed between the convex portion of the bearing end cover and the stepped surface of the outer housing, and the receiving cavity is connected to the bearing mounting area between the main shaft and the outer housing. A sealing assembly is disposed within the receiving cavity. The sealing assembly includes a first sealing body, a first support frame, a second support frame, a first annular support spring, and a second annular support spring. The first support frame has a U-shaped segment and a straight extension segment. The U-shaped segment fits tightly against the stepped surface of the outer shell. One end of the U-shaped segment bends and extends towards the main shaft to form a straight extension segment, which is perpendicular to the axis of the main shaft. The second support frame has a U-shaped structure and is fitted onto the outside of the convex portion of the bearing end cover and fits tightly against it. The first sealing body has a groove that matches the straight extension segment. The first sealing body also has a first sealing lip and a second sealing lip. The first sealing lip and the second sealing lip are symmetrically arranged on both sides of the groove and fit against the second support frame. A first annular support spring is disposed inside the lip of the first sealing lip, and a second annular support spring is disposed inside the lip of the second sealing lip.

2. The double-lip type multi-protection combined sealing device for rake blade hub bearings according to claim 1, characterized in that: The sealing assembly further includes a second sealing body, which has a limiting groove that mates with the port of the second support frame. The second sealing body is pressed and fitted against the inner surface of the convex portion of the bearing end cover by the second support frame. A channel is formed between the first support frame and the second support frame. A protruding rib is provided on the outer side of the second sealing body, which is used to block the channel.

3. A double-lip type multi-protection combined sealing device for a rake blade hub bearing according to claim 2, characterized in that: There are several protruding ribs, which are spaced apart along the length of the second sealing body.

4. A double-lip type multi-protection combined sealing device for a rake blade hub bearing according to claim 3, characterized in that: The bearing mounting area is provided with a bearing inner ring, the front surface of which abuts against the bearing end cover, the outer diameter of which is larger than the base outer diameter of the bearing end cover, and one end of the second support frame is in contact with the end face of the bearing inner ring.

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