Reliably sealed automotive propeller shaft bearing

Abstract

This utility model discloses a reliable sealing automotive driveshaft bearing, comprising an outer ring, an inner ring, and rolling elements. The rolling elements are disposed between the outer ring and the inner ring. A first frame is connected to the inner ring. The first frame includes a connecting portion connected to the outer wall of the inner ring and a blocking portion for blocking the space between the outer ring and the inner ring. A second frame is connected to the inner wall of the outer ring. A sealing lip is connected to the second frame. The sealing lip includes a first lip body and a second lip body. The first lip body abuts against the blocking portion of the first frame, and the second lip body abuts against the connecting portion of the first frame. The end of the first lip body has an excess portion for abutting against the blocking portion when the outer ring is not concentric. This design achieves effective sealing while exhibiting good operational stability.

Description

Technical Field

[0001] This utility model relates to a reliable and sealed automotive drive shaft bearing. Background Technology

[0002] As a key component of the automotive transmission system, the driveshaft support bearing is installed at the output end of the differential, and its main function is to provide stable support for the driveshaft. During vehicle operation, the radial and axial loads on this bearing are relatively small, and the operating speed is low. Theoretically, under normal installation and use, the probability of failure due to fatigue wear is negligible. However, due to limitations in assembly processes, it is difficult to achieve ideal concentricity in the bearing mounting holes. This necessitates that the bearing possess excellent self-aligning performance to compensate for operational deviations caused by misalignment and ensure smooth operation of the driveshaft. Simultaneously, after installation, the bearing is directly exposed to the external environment, making it highly susceptible to contaminants such as sand, rainwater, and mud. However, due to the significant misalignment of the mounting holes in this type of bearing, the inner and outer rings may become misaligned during operation. This reduces the interference fit between the inner rubber seal and the outer dust cover, leading to bearing seal failure. To avoid seal failure due to misalignment, the interference fit between the inner rubber seal and the outer dust cover needs to be increased, but this also increases the bearing's rotational torque, affecting the smooth operation of the structure. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a reliable automotive driveshaft bearing that achieves effective sealing while maintaining good operational stability.

[0004] To achieve the above objectives, this utility model provides a reliable and sealed automotive driveshaft bearing, comprising an outer ring, an inner ring, and rolling elements. The rolling elements are disposed between the outer ring and the inner ring. A first frame is connected to the inner ring. The first frame includes a connecting portion connected to the outer wall of the inner ring and a blocking portion for blocking between the outer ring and the inner ring. A second frame is connected to the inner wall of the outer ring. A sealing lip is connected to the second frame. The sealing lip includes a first lip body and a second lip body. The first lip body abuts against the blocking portion of the first frame, and the second lip body abuts against the connecting portion of the first frame. The end of the first lip body has an excess portion for abutting against the blocking portion when the outer ring is not concentric.

[0005] The beneficial effects of this design are as follows: With only one first lip in the radial direction, the interference fit between the first lip and the outer shield can be increased without increasing torque, and sealing failure can be avoided when the inner and outer rings of the bearing are misaligned. The second lip is an axial interference lip; even if the bearing operates eccentrically or experiences axial displacement, the second lip will not detach from the outer dust cover, and the bearing sealing performance will not be affected. Simultaneously, the first lip abuts against the first frame shield, and the second lip abuts against the first frame connection, forming a double sealing protection in both the radial and axial directions. The first lip prevents external dust, water, and other foreign objects from radially intruding into the bearing, while the second lip prevents foreign objects from entering axially. During vehicle operation, the drive shaft may experience misalignment of the inner and outer rings of the bearing due to road bumps, component wear, etc. In this case, the excess portion at the end of the first lip plays a crucial role. This excess portion has a certain degree of elasticity and deformation space; when facing misalignment of the outer ring, it can elastically deform and tightly abut against the shield, automatically compensating for the gap caused by eccentricity and ensuring the effectiveness of the seal. Traditional multi-lip sealing structures often result in a significant increase in torque when the interference fit is increased to improve the sealing effect, affecting power transmission efficiency. This design, however, uses only one first lip in the radial direction, reducing the number of lips and their friction. While increasing the interference fit between the first lip and the outer shielding part, it does not cause a significant increase in torque, ensuring smooth operation of the structure.

[0006] As a further feature of this invention, the sealing lip also includes a third lip body, which is disposed on one side of the second lip body. The second lip body abuts against the connecting portion, with the end of the second lip body facing away from the rolling element and the free end of the third lip body facing towards the end close to the rolling element.

[0007] The beneficial effects of this design are: it further enhances the axial sealing effect. The end of the second lip is far from the rolling elements, preventing the intrusion of external foreign objects, while the free end of the third lip faces the rolling elements, effectively preventing internal grease leakage. Even under extreme conditions such as frequent starts and stops and severe vibrations, it can comprehensively resist axial foreign object intrusion while firmly locking in the grease, reducing bearing wear caused by poor lubrication, and significantly improving the sealing reliability and service life of the bearing under complex axial stress environments.

[0008] As a further feature of this invention, a positioning platform is formed on the outer ring, a raceway is provided on the positioning platform, the rolling element is fitted in the raceway, positioning grooves are provided on both sides of the positioning platform on the outer ring, the second frame is disposed in the positioning groove, and the side wall of the positioning platform is inclined and abuts against the outer wall of the second frame.

[0009] The advantages of this design are as follows: The positioning groove firmly secures the second skeleton to the outer ring, preventing circumferential or axial displacement during bearing operation and ensuring the sealing lip remains in the correct working position. The inclined design of the positioning platform sidewall cleverly utilizes mechanical principles to generate a thrust towards the first skeleton on the second skeleton. During bearing assembly and operation, this thrust keeps the second skeleton inclined towards the first skeleton, ensuring a tight fit between the sealing lip and the first skeleton, reducing gaps and effectively preventing the entry of foreign objects. Simultaneously, this inclined state enhances the uniformity of contact between the sealing lip and the first skeleton, maintaining stable sealing pressure even under complex operating conditions such as bearing vibration and impact, preventing seal failure due to loosening or misalignment of the sealing lip.

[0010] As a further feature of this invention, one end face of the second frame abuts against the side wall of the positioning platform, and the other end face of the second frame is covered with a connecting lip, which is engaged in the positioning groove.

[0011] The advantages of this design are as follows: With this configuration, the end face abuts against the inclined sidewall of the positioning platform, generating axial preload through the inclined thrust; the other end connecting lip engages with the positioning groove, achieving circumferential locking through the groove structure. When the bearing is subjected to alternating loads, the inclined thrust compensates for the clearance caused by vibration, and the groove prevents the skeleton from shifting, ensuring the sealing lip remains aligned with the first skeleton and preventing seal failure caused by skeleton displacement. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model. Detailed Implementation

[0013] Examples of implementations of this utility model of a reliably sealed automotive driveshaft bearing Figure 1The bearing includes an outer ring 1, an inner ring 2, and rolling elements 3. The rolling elements 3 are disposed between the outer ring 1 and the inner ring 2. A first frame is connected to the inner ring 2. The first frame includes a connecting portion 41 connected to the outer wall of the inner ring 2 and a blocking portion 42 for blocking the space between the outer ring 1 and the inner ring 2. A second frame 5 is connected to the inner wall of the outer ring 1. A sealing lip is connected to the second frame 5. The sealing lip includes a first lip body 61 and a second lip body 62. The first lip body 61 abuts against the blocking portion 42 of the first frame, and the second lip body 62 abuts against the connecting portion 41 of the first frame. The end of the first lip body 61 has an excess portion 611 for abutting against the blocking portion 42 when the outer ring 1 is not concentric. The beneficial effect of this configuration is that, since there is only one first lip body 61 in the radial direction, the interference fit between the first lip body 61 and the outer blocking portion 42 can be increased without causing an increase in torque. At the same time, it can prevent sealing failure when the inner and outer rings 1 of the bearing are not concentric. The second lip 62 is an axial interference lip, ensuring that even if the bearing operates eccentrically or experiences axial displacement, the second lip 62 will not detach from the outer dust cover, and the bearing sealing performance will not be affected. Simultaneously, the first lip 61 abuts against the first frame shielding portion 42, and the second lip 62 abuts against the first frame connecting portion 41, forming a double-seal protection in both the radial and axial directions. The first lip 61 prevents external dust, water, and other foreign objects from radially intruding into the bearing, while the second lip 62 prevents foreign objects from entering axially. During vehicle operation, the drive shaft may experience misalignment of the inner and outer rings 1 due to road bumps, component wear, etc. In this case, the excess portion 611 at the end of the first lip 61 plays a crucial role. The excess portion 611 has a certain degree of elasticity and deformation space. When facing misalignment of the outer ring 1, it can elastically deform and tightly abut against the shielding portion 42, automatically compensating for the gap caused by eccentricity and ensuring the effectiveness of the seal. Traditional multi-lip seal structures, when increasing the interference fit to improve the sealing effect, often result in a significant increase in torque, affecting power transmission efficiency. This design uses only one first lip body 61 in the radial direction, which reduces the number of lips and the friction between them. While increasing the interference between the first lip body 61 and the outer shielding part 42, it does not cause a significant increase in torque, ensuring the smooth operation of the structure.

[0014] As a further feature of this embodiment, the sealing lip also includes a third lip body 63, which is disposed on one side of the second lip body 62. The second lip body 62 abuts against the connecting portion 41, with the end of the second lip body 62 facing away from the rolling element 3, and the free end of the third lip body 63 facing towards the rolling element 3. The beneficial effect of this configuration is that it further enhances the axial sealing effect. The end of the second lip body 62, being away from the rolling element 3, can prevent the intrusion of external foreign objects, while the free end of the third lip body 63, facing the rolling element 3, can effectively prevent internal grease leakage. Even under extreme operating conditions such as frequent starts and stops of the vehicle and severe vibrations, it can comprehensively resist the intrusion of axial foreign objects while firmly locking in the grease, reducing bearing wear caused by poor lubrication, and significantly improving the sealing reliability and service life of the bearing under complex axial stress environments.

[0015] As a further feature of this embodiment, a positioning platform 11 is formed on the outer ring 1, and a raceway is provided on the positioning platform 11. The rolling element 3 is fitted in the raceway. Positioning grooves are provided on both sides of the positioning platform 11 on the outer ring 1, and the second frame 5 is disposed in the positioning grooves. The sidewall of the positioning platform 11 is inclined and abuts against the outer wall of the second frame 5. The beneficial effect of this configuration is that the positioning grooves firmly fix the second frame 5 to the outer ring 1, preventing circumferential or axial displacement during bearing operation and ensuring that the sealing lip is always in the correct working position. The inclined design of the sidewall of the positioning platform 11 cleverly utilizes mechanical principles to generate a thrust on the second frame 5 towards the first frame. During bearing assembly and operation, this thrust keeps the second frame 5 in an inclined state towards the first frame, thereby ensuring that the sealing lip is tightly fitted with the first frame, reducing the gap between them, and effectively preventing the entry of foreign objects. At the same time, this tilted state can enhance the uniformity of contact between the sealing lip and the first skeleton, and maintain a stable sealing pressure even under complex working conditions such as bearing vibration and impact, thus avoiding sealing failure caused by loosening or displacement of the sealing lip.

[0016] As a further feature of this embodiment, one end face of the second frame 5 abuts against the side wall of the positioning platform 11, and the other end face of the second frame 5 is covered with a connecting lip 64, which is engaged in the positioning groove. The advantages of this configuration are: with this configuration, the end face abuts against the inclined side wall of the positioning platform 11, generating axial preload through the inclined thrust; the connecting lip 64 at the other end engages in the positioning groove, achieving circumferential locking through the groove structure. When the bearing is subjected to alternating loads, the inclined thrust can compensate for the gap caused by vibration, and the groove can prevent frame displacement, ensuring that the sealing lip remains aligned with the first frame and avoiding seal failure caused by frame displacement.

[0017] The above examples are merely one preferred embodiment of this utility model. Ordinary variations and substitutions made by those skilled in the art within the scope of this utility model's technical solution are all included within the protection scope of this utility model.

Claims

1. A reliably sealed automotive driveshaft bearing, comprising an outer ring, an inner ring, and rolling elements, wherein the rolling elements are disposed between the outer ring and the inner ring, characterized in that: A first skeleton is connected to the inner ring. The first skeleton includes a connecting part connected to the outer wall of the inner ring and a blocking part for blocking between the outer ring and the inner ring. A second skeleton is connected to the inner wall of the outer ring. A sealing lip is connected to the second skeleton. The sealing lip includes a first lip body and a second lip body. The first lip body abuts against the blocking part of the first skeleton, and the second lip body abuts against the connecting part of the first skeleton. The end of the first lip body has an excess portion for abutting against the blocking part when the outer ring is not concentric.

2. The reliably sealed automotive driveshaft bearing according to claim 1, characterized in that: The sealing lip also includes a third lip body, which is disposed on one side of the second lip body. The second lip body abuts against the connecting portion, with the end of the second lip body facing away from the rolling element and the free end of the third lip body facing towards the end close to the rolling element.

3. The reliably sealed automotive driveshaft bearing according to claim 2, characterized in that: A positioning platform is formed on the outer ring, and a raceway is provided on the positioning platform. The rolling element is fitted in the raceway. Positioning grooves are provided on both sides of the positioning platform on the outer ring. The second frame is disposed in the positioning groove. The side wall of the positioning platform is inclined and abuts against the outer wall of the second frame.

4. The automotive driveshaft bearing with reliable sealing according to claim 3, characterized in that: One end face of the second frame abuts against the side wall of the positioning platform, and the other end face of the second frame is covered with a connecting lip, which is engaged in the positioning groove.

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