A multi-protection combined sealing device for rake blade hub bearings

Abstract

This utility model discloses a multi-protection combined sealing device for a rake blade hub bearing, including a main shaft; a cover sleeved on the front end of the main shaft, the cover having a cylindrical base and a radially outwardly protruding convex portion at the front end of the base; an outer housing coaxially sleeved on the main shaft, the inner hole of which has a radially inwardly extending stepped surface; an annular receiving cavity is formed between the convex portion of the cover and the stepped surface of the outer housing, the receiving cavity communicating with the bearing mounting area between the main shaft and the outer housing; and a sealing assembly disposed in the receiving cavity, the sealing assembly including at least three layers of sealing rings spaced apart along the axial direction, and a support assembly supporting the sealing rings, the sealing rings and the support assembly forming a gradient progressive sealing structure, constructing a multi-level gradient dynamic interception barrier inside the agricultural machinery bearing, utilizing the continuous back-turn effect of the pollutant migration path to achieve efficient sedimentation of impurities and enhance the sealing effect.

Description

Technical Field

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

[0002] Agricultural machinery disc harrow wheel hub bearings are subjected to extreme working conditions of high dust, mud splashing, and crop residue entanglement for a long time. Sealing failure is the main cause of early bearing damage. Traditional single-layer lip seal structure is prone to permanent deformation under the impact of gravel, forming a channel for impurities to enter. Simple labyrinth seal structure has a short sealing path and large gap, which cannot effectively intercept high-speed splashed particulate impurities and corrosive media. Impurities can easily penetrate the sealing interface and enter the bearing area, leading to lubrication failure, groove peeling and early fatigue, and a significant decrease in the reliability of the whole machine.

[0003] To address the aforementioned shortcomings, there is an urgent need for a sealing device that can achieve multi-gradient barrier protection, in order to significantly improve sealing reliability and extend the service life of such bearings. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model relates to a multi-protection combined sealing device for rake blade hub bearings. This device has a simple and reliable structure, effectively solves 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:

[0005] A multi-protection combined sealing device for rake blade hub bearings, comprising:

[0006] spindle;

[0007] A cover fitted onto the front end of the main shaft, the cover having a cylindrical base and a radially outwardly protruding cam portion located at the front end of the base;

[0008] The outer housing is coaxially fitted outside the main shaft, and its front end inner hole has a stepped surface that extends radially inward;

[0009] An annular receiving cavity is formed between the convex portion of the cover and the stepped surface of the outer shell, and the receiving cavity is connected to the bearing mounting area between the main shaft and the outer shell;

[0010] A sealing assembly disposed within the receiving cavity includes at least three layers of sealing rings spaced apart along the axial direction, and a support assembly supporting the sealing rings, wherein the sealing rings and the support assembly constitute a gradient progressive sealing structure.

[0011] Based on the above scheme and as a preferred embodiment of the above scheme: the support component includes a first support body and a second support body;

[0012] The first support body is a ring structure with a concave cross-section. It has a connecting plate that fits with the inner hole surface of the outer shell, an inner side plate and an outer side plate that bend inward from both ends of the connecting plate, wherein the inner side plate abuts against the stepped surface of the outer shell, and a first axial gap is formed between the outer side plate and the cylindrical base of the cover body.

[0013] The second support body is sleeved on the outside of the base of the cover body. It has an outer ring body that mates with the base of the cover body and a partition plate that extends radially outward from the front end of the outer ring body. The partition plate is inserted between the inner side plate and the outer side plate of the first support body, and a second axial gap is formed between the partition plate and the connecting plate.

[0014] The outer side plate and the cover plate form a first radial channel, the outer side plate and the partition plate form a second radial channel, and the partition plate and the inner side plate form a third radial channel. The first axial gap connects the first radial channel and the second radial channel, and the second axial gap connects the second and third radial channels, forming a continuous zigzag sealing path. The sealing ring is used to establish a gradient sealing barrier in the zigzag sealing path.

[0015] Based on the above scheme and as a preferred embodiment of the above scheme: each layer of sealing ring surface is provided with protruding ribs, and several protruding ribs are spaced apart along the length direction of the sealing ring.

[0016] Based on the above scheme and as a preferred embodiment of the above scheme: the sealing ring is divided into

[0017] The first sealing ring is fixed to the end face of the outer side plate of the first support body facing the cover plate, and its protruding ribs extend into the first radial channel and block the radial through path.

[0018] The second sealing ring is fixed to the end face of the second support body partition near the outer side plate, and its protruding ribs extend into the second radial channel to block the radial through path;

[0019] The third sealing ring is fixed to the axial end face of the partition plate near the inner side plate, and its protruding ribs extend into the third radial channel to block the radial through path.

[0020] Based on the above scheme and as a preferred option: each protruding rib undergoes directional bending deformation under axial assembly pre-tightening, with the bending direction pointing towards the pollutant inflow end of its channel, forming a hook-shaped sealing structure opposite to the direction of media intrusion.

[0021] The outstanding and beneficial technical effects of this invention compared to the prior art are as follows: This invention constructs a multi-level gradient dynamic dirt interception barrier inside the agricultural machinery bearing through an innovative multi-level serpentine variable sealing channel and reverse bending rib design. It utilizes the continuous back-and-forth effect of the pollutant migration path to achieve efficient sedimentation of impurities, enhance the sealing effect, and completely solve the problem of sealing failure under high dust and mud splash conditions, thereby achieving a breakthrough improvement in the service life of the rake wheel hub bearing. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the internal cross-section of the bearing;

[0023] Figure 2 This is a schematic diagram of the bearing's three-dimensional structure. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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.

[0027] To address the aforementioned technical issues, such as Figure 1-2 As shown, this utility model designs a multi-protection combined sealing device for rake blade hub bearings, including...

[0028] Main spindle 1 serves as the torque input end and is the assembly reference for the entire bearing structure, providing a coaxial reference for the subsequent cover 2 and outer shell 3.

[0029] A cover 2 is fitted onto the front end of the main shaft 1. The cover 2 has a cylindrical base 21 and a radially outward protruding convex portion 22 located at the front end of the base 21. A gap is left between the convex portion 22 and the inner hole of the outer shell 3.

[0030] The outer housing 3, which is coaxially sleeved outside the main shaft 1, has a stepped surface extending radially inward in the inner hole at its front end;

[0031] The convex portion 22 of the cover 2 forms a baffle in the axial direction, which not only blocks the directly splashed mud, but also forms an annular receiving cavity 4 with the stepped surface of the outer shell 3. The receiving cavity 4 is connected to the bearing mounting area between the main shaft 1 and the outer shell 3.

[0032] The sealing assembly located within the receiving cavity 4 includes at least three layers of sealing rings spaced apart along the axial direction, and a support assembly supporting the sealing rings. The sealing rings and the support assembly form a gradient progressive sealing structure. By utilizing multiple layers of sealing rings for step-by-step protection, external contaminant particles are weakened layer by layer, preventing them from ultimately reaching the raceway. This achieves gradient filtration from the surface to the inside, which is significantly better than the traditional single-stage sealing method, can extend bearing life, and improve its reliability.

[0033] In this embodiment, it is further preferred that the support component includes a first support body 5 and a second support body 6;

[0034] The first support 5 is a ring structure with a concave cross-section. It has a connecting plate 51 that fits into the inner hole surface of the outer shell 3, an inner side plate 52 and an outer side plate 53 that bend inward from both ends of the connecting plate 51. The inner side plate 52 is attached to the stepped surface of the outer shell 3, and the outer side plate 53 forms a first axial gap with the cylindrical base 21 of the cover 2. The first support 5 forms a rigid constraint in both the radial and axial directions through the continuous bending of the connecting plate 51, the outer side plate 53 and the inner side plate 52. This provides a reference mounting surface for the sealing ring and initially divides the receiving cavity 4 into two-stage reflux zones, so that large particles of impurities will undergo inertial separation during the first reflux.

[0035] The second support 6 is sleeved on the outside of the base 21 of the cover 2. It has an outer ring 61 that mates with the base 21 of the cover 2 and a partition 62 that extends radially outward from the front end of the outer ring 61. The partition 62 is inserted between the inner side plate 52 and the outer side plate 53 of the first support 5. A second axial gap is formed between the partition 62 and the connecting plate 51. After the partition 62 is radially inserted into the groove of the first support 5, it splits the single path into two parallel and opposite sub-channels, so that the medium flow must undergo a second reversal before it can continue to penetrate. This structure achieves a geometric increase in path length while maintaining a compact axial dimension.

[0036] The outer side plate 53 and the convex plate of the cover 2 form a first radial channel 7, the outer side plate 53 and the partition plate 62 form a second radial channel 8, and the partition plate 62 and the inner side plate 52 form a third radial channel 9. The first axial gap connects the first and second radial channels, and the second axial gap connects the second and third radial channels, forming a continuous zigzag sealing path. The continuous zigzag path, consisting of the first radial channel 7, the first axial gap, the second radial channel 8, the second axial gap, and the third radial channel 9 connected in series, allows pollutants to undergo multiple directional reversals within a limited space. The centrifugal separation and turbulent dissipation caused by the sudden change in direction work together to form a natural settling zone, reducing the load on the subsequent sealing ring.

[0037] The sealing ring can establish a gradient sealing barrier in the serpentine sealing path, with its sealing strength increasing from the outside to the inside. Through spatial misalignment and functional sharing, the wear risk of a single sealing surface is dispersed to multiple levels, so that the wear originally concentrated on a single sealing surface is absorbed by multiple levels in a coordinated manner, significantly extending the overall sealing life.

[0038] In this embodiment, it is further preferred that each sealing ring surface is provided with protruding ribs 13. The protruding ribs 13 are actually distributed in a ring shape in the three-dimensional structure. Several protruding ribs 13 are spaced apart along the length direction of the sealing ring, which actually forms multiple parallel ring ridges. This arrangement significantly increases the contact area with the medium and the turbulence damping without increasing the thickness of the sealing ring, so that impurities are reflected, decelerated and deposited multiple times between adjacent ring ridges, thus weakening their kinetic energy in advance.

[0039] In this embodiment, it is further preferred that the sealing ring is divided into a first sealing ring 10, which is fixed to the end face of the outer side plate 53 of the first support body 5 facing the convex disk of the cover body 2, and its protrusion extends into the first radial channel 7 and blocks the radial through path; a second sealing ring 11, which is fixed to the end face of the partition 62 of the second support body 6 near the outer side plate 53, and its protrusion extends into the second radial channel 8 to block the radial through path; and a third sealing ring 12, which is fixed to the axial end face of the partition 62 near the inner side plate 52, and its protrusion extends into the third radial channel 9 to block the radial through path. Furthermore, preferably, each protruding rib 13 undergoes directional bending deformation under axial assembly pre-tightening, with the bending direction pointing towards the pollutant inflow end of its channel, forming a hook-shaped sealing structure opposite to the direction of media intrusion. Through the precise layout of the three sealing rings in the serpentine channel and the reverse hook-shaped bending design of the protruding rib 13, a multi-level linkage dynamic pollution interception system is constructed. The first sealing ring 10 protruding rib 13 blocks external direct-flowing impurities, the second sealing ring 11 protruding rib 13 intercepts diverted migrating particles, and the third sealing ring 12 protruding rib 13 seals the final permeation channel. Under the action of assembly pre-tightening force, each protruding rib 13 is directionally bent to form a hook-shaped sealing lip, with its bending direction always opposite to the pollutant flow direction, so that various pollutants settle step by step in the three-level return channel, completely eliminating the problem of rapid bearing damage caused by the failure of a single barrier in traditional seals, and achieving long-term sealing protection for agricultural machinery wheel hub bearings under extreme working conditions.

[0040] The rib 13 and the sealing ring body are integrally vulcanized and molded. The material can be hydrogenated nitrile rubber. At the same time, the surface of the rib 13 is covered with a wear-resistant coating to ensure that the sealing performance can maintain low wear and long service life even when rotating at high speed.

[0041] In addition, the outer edge of each sealing ring is further bent toward the axial gap area to form a covering wing. This wing is also vulcanized to form continuous protrusions 13. The bent wing is tightly attached to the gap sidewall under assembly pre-tightening. The protrusions 13 are bent in the opposite direction into a hook shape, directly blocking the potential leakage channel of the axial gap, realizing radial and axial double interception, so that impurities are intercepted a second time before entering the next channel, and the redundancy and reliability of the overall sealing link are improved again.

[0042] 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 multiple shielded combination seal for a harrow hub bearing, comprising: include spindle; A cover fitted onto the front end of the main shaft, the cover 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 cover and the stepped surface of the outer shell, and the receiving cavity is connected to the bearing mounting area between the main shaft and the outer shell; A sealing assembly disposed within the receiving cavity includes at least three layers of sealing rings spaced apart along the axial direction, and a support assembly supporting the sealing rings, wherein the sealing rings and the support assembly constitute a gradient progressive sealing structure.

2. The multi-protection combined sealing device for rake blade hub bearings according to claim 1, characterized in that: The support assembly includes a first support body and a second support body; The first support body is a ring structure with a concave cross-section. It has a connecting plate that fits with the inner hole surface of the outer shell, an inner side plate and an outer side plate that bend inward from both ends of the connecting plate, wherein the inner side plate abuts against the stepped surface of the outer shell, and a first axial gap is formed between the outer side plate and the cylindrical base of the cover body. The second support body is sleeved on the outside of the base of the cover body. It has an outer ring body that mates with the base of the cover body and a partition plate that extends radially outward from the front end of the outer ring body. The partition plate is inserted between the inner side plate and the outer side plate of the first support body, and a second axial gap is formed between the partition plate and the connecting plate. The outer side plate and the cover protrusion form a first radial channel, the outer side plate and the partition plate form a second radial channel, and the partition plate and the inner side plate form a third radial channel. The first axial gap connects the first radial channel and the second radial channel, and the second axial gap connects the second radial channel and the third radial channel, forming a continuous zigzag sealing path. The sealing ring is used to establish a gradient sealing barrier in the zigzag sealing path.

3. A multi-protection combined sealing device for a rake blade hub bearing according to claim 2, characterized in that: Each sealing ring surface is provided with protruding ribs, and several protruding ribs are spaced apart along the length of the sealing ring.

4. A multi-protection combined sealing device for a rake blade hub bearing according to claim 3, characterized in that: The sealing ring is divided into The first sealing ring is fixed to the end face of the outer side plate of the first support body facing the cover plate, and its protruding rib extends into the first radial channel and blocks the radial through path. The second sealing ring is fixed to the end face of the second support body partition near the outer side plate, and its protruding ribs extend into the second radial channel to block the radial through path; The third sealing ring is fixed to the axial end face of the partition plate near the inner side plate, and its protruding ribs extend into the third radial channel to block the radial through path.

5. A multi-protection combined sealing device for a rake blade hub bearing according to claim 4, characterized in that: Each rib undergoes directional bending deformation under axial assembly pre-tightening, with the bending direction pointing towards the pollutant inflow end of its channel, forming a hook-shaped sealing structure opposite to the direction of media intrusion.

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