Oil seal, drive axle and vehicle

Abstract

The application discloses an oil seal, a drive axle and a vehicle, and the oil seal comprises an oil seal body provided with a main lip; a supporting frame adapted to be connected with a hub bearing, the oil seal body and the supporting frame can rotate relative to each other, and the main lip is in abutment with the supporting frame. By setting the supporting frame and the abutment of the main lip and the supporting frame, the force on the oil seal body during assembly is uniform, deformation and failure of the oil seal body are avoided, lateral impact during operation of the vehicle can be resisted, and high temperature, oil leakage, abnormal wear of the hub bearing and other faults caused by sealing failure of the hub can be avoided.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to an oil seal, a drive axle, and a vehicle. Background Technology

[0002] In related technologies, the oil seal is a single oil seal structure, and the main body of the oil seal includes a main lip and a secondary lip. However, the existing oil seal also has significant defects: poor sealing performance, lubricating medium and iron filings can easily enter the wheel hub cavity through the oil seal, leading to wheel hub bearing failure, abnormal noise at the wheel end, high temperature and other faults. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes an oil seal that can resist lateral impacts on a vehicle during operation, thereby preventing wheel hub failures such as high temperature, oil leakage, and abnormal wear of wheel hub bearings due to seal failure.

[0004] The present invention further proposes a drive bridge.

[0005] The present invention further proposes a vehicle.

[0006] The oil seal according to the present invention includes: an oil seal body having a main lip; a support frame adapted to be connected to a wheel hub bearing, wherein the oil seal body and the support frame are rotatable relative to each other, and the main lip abuts against the support frame.

[0007] According to the present invention, the oil seal is provided with a support frame, and the main lip is abutted against the support frame. This allows the oil seal body to be subjected to uniform force during assembly, preventing deformation and failure of the oil seal body. It can resist lateral impacts on the vehicle during operation, thereby preventing wheel hub failures such as high temperature, oil leakage, and abnormal wear of wheel hub bearings due to seal failure.

[0008] In some examples of the present invention, a return oil line is provided at the main lip, and the return oil line is constructed as a bidirectional sine wave structure.

[0009] In some examples of the invention, the depth of the return oil line gradually decreases in the direction toward the tip of the main lip.

[0010] In some examples of the present invention, the return oil line includes an abutting portion, which abuts against the support frame when the tip of the main lip is pressed and deformed against the support frame.

[0011] In some examples of the present invention, the contact area of ​​the contact portion gradually increases in the direction away from the tip of the main lip.

[0012] In some examples of the present invention, the return oil line further includes a pump suction section connected to the side of the abutment portion away from the tip of the main lip, wherein the cross-sectional area of ​​the pump suction section gradually increases in the direction toward the abutment portion.

[0013] In some examples of the present invention, the support frame includes: a first bracket and a second bracket, the first bracket being adapted to be connected to a hub bearing, the main lip being disposed in abutment against the first bracket, the second bracket being connected to the first bracket, and the first bracket and the second bracket being disposed perpendicularly to each other.

[0014] In some examples of the present invention, the oil seal body is further provided with a first secondary lip and a second secondary lip, wherein the first secondary lip is spaced apart from the first bracket, and the second secondary lip is abutted against the second bracket.

[0015] The drive axle according to the present invention includes: a half-shaft sleeve; a hub, the hub including: a hub body and a hub bearing, the hub body being fixed to the half-shaft sleeve, and the hub bearing being connected to the hub body; the oil seal described above, and the support frame being connected to the hub bearing.

[0016] The vehicle according to the present invention includes: the drive axle described above.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of an oil seal according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the return oil line structure; Figure 3 This is a schematic diagram of the drive bridge according to another embodiment of the present invention.

[0019] Figure label: 1. Oil seal; 10. Oil seal body; 100. Main lip; 101. Oil return line; 102. Lip tip; 103. Abutment part; 104. Pump suction part; 110. First secondary lip; 120. Second secondary lip; 20. Support frame; 200. First bracket; 210. Second bracket; 2. Drive axle; 30. Half shaft sleeve; 40. Wheel hub; 400. Wheel hub body; 410. Wheel hub bearing; 411. Wheel hub outer bearing; 412. Wheel hub inner bearing; 500. Outer oil seal; 510. Inner oil seal; 60. Intermediate sealing ring; 70. Intermediate retaining ring; 80. Nut locking plate; 90. Locking nut. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0021] The following is for reference. Figures 1-3 The oil seal 1 according to an embodiment of the present invention is described.

[0022] like Figure 1 As shown, the oil seal 1 according to an embodiment of the present invention includes: an oil seal body 10 and a support frame 20. The oil seal body 10 can perform a sealing function, and the support frame 20 can perform a supporting function.

[0023] The oil seal body 10 is provided with a main lip 100, and the support frame 20 is adapted to be connected to the wheel hub bearing 410. The oil seal body 10 and the support frame 20 can rotate relative to each other, and the main lip 100 and the support frame 20 are abutted together. The main lip 100 provides a dynamic seal, preventing leakage of the lubricating medium inside the sealing cavity and also acting as a pump. The support frame 20 connects to the hub bearing 410, securely mounting the oil seal body 10 onto the hub bearing 410. This together ensures the normal operation of the hub 40 under complex working conditions. The oil seal body 10 and the support frame 20 can rotate relative to each other; that is, one remains fixed while the other can rotate. This allows the oil seal 1 to adapt to complex and changing mechanical motion conditions, ensuring reliable sealing. The main lip 100 abuts against the support frame 20, effectively sealing the oil seal body and preventing leakage of the lubricating medium. The support frame 20 ensures even stress distribution on the oil seal body 10 during assembly, reducing deformation and failure, and also decreasing friction between the oil seal body 10 and the abutting part. The lubricating medium can be grease.

[0024] Therefore, by setting up a support frame 20, with the main lip 100 abutting against the support frame 20, the oil seal body 10 can be subjected to uniform force during assembly, avoiding deformation and failure of the oil seal body 10, and resisting lateral impacts on the vehicle during operation. This can prevent the wheel hub 40 from experiencing high temperature, oil leakage, abnormal wear of the wheel hub bearing 410, and other malfunctions caused by seal failure.

[0025] Specifically, such as Figure 2 As shown, a return oil line 101 is provided at the main lip 100, and the return oil line 101 is constructed as a bidirectional sine wave structure. The return oil line 101 is located on the side of the main lip 100 facing the outside of the sealing cavity. The return oil line 101 can utilize the pumping effect generated by the shaft rotation to force the lubricating medium leaking to the outside of the main lip 100 back into the sealing cavity. Specifically, when the lubricating medium inside the sealing cavity attempts to leak, the lubricating medium passes through the main lip 100 and reaches the location of the return oil line 101. At this time, the hub 40 rotates, and the return oil line 101 generates pumping, which can pump the lubricating medium back to the inside of the sealing cavity in the opposite direction.

[0026] The bidirectional sine wave structure can adapt to bidirectional rotation, and can simultaneously achieve bidirectional isolation of internal media from leakage and external contaminants from intrusion under bidirectional shaft rotation or bidirectional pressure conditions. It can also adapt to forward and reverse operation without failure. Specifically, it can prevent lubricating media from leaking to the outside, while preventing external water, dust and impurities from intruding into the inside. It can maintain the cleanliness and pressure stability of the sealed cavity. Secondly, it can maintain effective sealing regardless of whether the shaft rotates clockwise or counterclockwise. In addition, it can reduce lubrication failure, component wear and corrosion caused by leakage, reduce maintenance frequency, and improve the durability of equipment under complex working conditions.

[0027] Among them, such as Figure 2 As shown, the depth of the return oil line 101 gradually decreases in the direction towards the lip tip 102 of the main lip 100. That is to say, the depth of the return oil line 101 is gradual. When the vehicle is stationary, the lip tip 102 of the main lip 100 contacts and seals with the support frame 20. If the groove formed by the return oil line 101 is too deep at this time, an oil leakage channel will be formed. Therefore, the depth of the return oil line 101 located at the lip tip 102 of the main lip 100 is shallower, which can avoid static oil leakage. The return oil line 101 in the direction away from the lip tip 102 of the main lip 100 gradually deepens. When the wheel hub 40 rotates, a deeper groove is needed to pump the oil film. The deeper return oil line 101 in the direction away from the lip tip 102 results in higher pumping efficiency.

[0028] It should be noted that the angle of the bevel facing the inner side of the sealing cavity of the oil return line 101 is precisely designed. This is beneficial for the main lip 100 to obtain a relatively wide contact width, which can reduce contact stress, reduce local wear, and improve the service life of the oil seal 1. In addition, the oil return line 101 is constructed as a bidirectional sine wave structure. The bidirectional sine wave structure can adapt to bidirectional rotation and is not prone to causing negative pressure between the lips. It can avoid interfering with the sealing gradient depth of the main lip 100 and can utilize the airflow of the shaft rotation, which is conducive to maintaining the pumping capacity of the main lip 100. After a period of operation, the lip tip 102 of the main lip 100 gradually wears down. The wear of the lip tip 102 fully connects with the oil return line 101, and the relatively wide contact surface of the oil return line 101 can provide a powerful pumping function.

[0029] In addition, such as Figure 2 As shown, the return oil line 101 includes an abutment portion 103, which abuts against the support frame 20 when the lip tip 102 of the main lip 100 is pressed and deformed against the support frame 20. The abutment portion 103 serves an abutment function. When the lip tip 102 of the main lip 100 is pressed and deformed against the support frame 20, the abutment portion 103 abuts against the support frame 20. This increases the contact area between the main lip 100 and the support frame 20, reducing pressure and improving lubrication. It forms a stable hydrodynamic oil film. The larger abutment area provides a larger bearing area for the oil film, making it more stable and less prone to rupture. This significantly reduces frictional torque and temperature rise, greatly extending the service life of the oil seal 1, reducing wear rate, and improving durability. It can transform concentrated point or line contact into surface contact, thereby avoiding stress concentration, improving tolerance to shaft runout and vibration, and maintaining seal continuity.

[0030] Of course, such as Figure 2 As shown, the contact area of ​​the contact portion 103 gradually increases in the direction away from the lip tip 102 of the main lip 100. This provides adaptive sealing capability, ensuring that the main lip 100 fits snugly against the support frame 20, maintaining an effective sealing pressure to prevent oil leakage. It also avoids stress concentration, preventing rubber edge cutting or tearing, thus protecting the structural integrity of the main lip 100. Furthermore, it optimizes the formation of the hydrodynamic oil film, providing an excellent hydrodynamic pressure generation zone for the lubricating medium. It can utilize a higher inlet pressure to block external leakage and a wider outlet area to smoothly pump excess lubricating medium back to the sealing cavity, preventing dry burning of the friction surface. It avoids the problem of high pressure causing wear and low pressure causing leakage, ensuring that the oil seal 1 maintains an optimal dynamic balance state during long-term dynamic operation, preventing both oil leakage and dry friction.

[0031] Furthermore, such as Figure 2As shown, the return oil line 101 also includes a pump suction section 104, which is connected to the side of the abutment section 103 away from the lip tip 102 of the main lip 100. The cross-sectional area of ​​the pump suction section 104 gradually increases in the direction toward the abutment section 103.

[0032] The pump suction section 104 can perform a pump suction function, forcibly expelling the lubricating medium sucked into the return oil line 101 back into the sealing cavity in a specific direction, usually towards the sealing cavity. The pump suction section 104 is connected to the side of the abutment section 103 away from the lip tip 102 of the main lip 100. At this time, the pump suction section 104 and the abutment section 103 form a whole, and the arrangement of the pump suction section 104 and the abutment section 103 is more in line with actual working conditions. The abutment section 103 can better achieve the abutment function, and the pump suction section 104 can better achieve the pump suction function. In the direction of 03, the cross-sectional area of ​​the pump suction part 104 gradually increases, which can enhance the wedge effect, generate strong hydrodynamic pressure, increase the pumping force into the sealing cavity, thereby greatly improving the leak prevention capability, optimizing the stress and deformation of the rubber, improving the fatigue life of the oil seal 1, and enabling the main lip 100 to have better dynamic following performance when encountering shaft wobble, improving the drainage efficiency and anti-impurity capability, and more smoothly collecting and draining the captured lubricating medium back into the sealing cavity, reducing the eddy currents and resistance of the fluid in the groove.

[0033] It should be noted that, as Figure 1 As shown, the support frame 20 includes: a first bracket 200 and a second bracket 210. The first bracket 200 is adapted to be connected to the hub bearing 410. The main lip 100 is abutted against the first bracket 200. The second bracket 210 is connected to the first bracket 200, and the first bracket 200 and the second bracket 210 are arranged perpendicularly to each other.

[0034] The first bracket 200 and the second bracket 210 are components of the support frame 20. Both the first bracket 200 and the second bracket 210 provide support. The first bracket 200 can be connected to the hub bearing 410. The main lip 100 abuts against the first bracket 200, which effectively seals the lubricating medium and prevents leakage from the sealing cavity. Furthermore, the first bracket 200 securely mounts the main lip 100 onto the hub bearing 410, ensuring the normal operation of the hub 40 under complex working conditions. The second bracket 210 is connected to the first bracket 200, forming a single unit that facilitates the installation of the support frame 20. The first bracket 200 and the second bracket 210 are perpendicular to each other, a configuration that better suits actual working conditions. The first bracket 200 and the second bracket 210 provide multi-dimensional structural support and rigidity, ensuring the installation accuracy of the oil seal body 10 and thus guaranteeing sealing reliability.

[0035] In addition, such as Figure 1 As shown, the oil seal body 10 is also provided with a first secondary lip 110 and a second secondary lip 120. The first secondary lip 110 is spaced apart from the first bracket 200, and the second secondary lip 120 is abutted against the second bracket 210. Both the first secondary lip 110 and the second secondary lip 120 can play a sealing and blocking role. When the first secondary lip 110 is spaced apart from the first bracket 200, it can effectively prevent dust, mud, and other impurities from the external environment from entering the sealed cavity. When the second secondary lip 120 is abutted against the second bracket 210, it can play a sealing role and can effectively prevent dust, mud, and other impurities from the external environment from entering the sealed cavity.

[0036] like Figure 3 As shown, the drive axle 2 according to an embodiment of the present invention includes: a half-shaft sleeve 30, a hub 40, the hub 40 including: a hub body 400 and a hub bearing 410, the hub body 400 is fixed on the half-shaft sleeve 30, the hub bearing 410 is connected to the hub body 400, and the oil seal 1 and the support frame 20 described in the above embodiment are connected to the hub bearing 410.

[0037] The half-shaft sleeve 30 can be used to fix the wheel position and bear weight, withstand road reaction forces, protect the half-shaft and transmit power, and provide a mounting base. The wheel hub 40 can be used to support and fix the tire, transmit power and braking force, and buffer impact and dissipate heat. The wheel hub body 400 and wheel hub bearing 410 are components of the wheel hub 40. The wheel hub body 400 is used to support and fix the tire, transmit power and braking force, and buffer impact and dissipate heat. The wheel hub bearing 410 can achieve load-bearing and precise guidance, and can ensure smooth tire movement and low friction. Friction rotation ensures driving safety. The wheel hub body 400 is fixed on the half-shaft sleeve 30. At this time, the wheel hub body 400 and the half-shaft sleeve 30 can better bear the weight of the whole vehicle and withstand the impact of the road. The wheel hub bearing 410 is connected to the wheel hub body 400. At this time, friction conversion and precise guidance can be realized. The oil seal 1 can play a sealing role. The support frame 20 is connected to the wheel hub bearing 410. At this time, the support frame 20 can firmly set the oil seal body 10 on the wheel hub bearing 410, which can jointly ensure the normal operation of the wheel hub 40 under complex working conditions.

[0038] It should be noted that the hub bearing 410 includes an outer hub bearing 411 and an inner hub bearing 412, and the oil seal 1 includes an outer oil seal 500 and an inner oil seal 510. The assembly process of the drive axle 2 is as follows: the inner oil seal 510 and the intermediate sealing ring 60 are assembled onto the inner hub bearing 412, the outer oil seal 500 and the intermediate sealing ring 60 are assembled onto the outer hub bearing 411, the inner hub bearing 412 and the outer hub bearing 411 are assembled onto the hub 40, the intermediate retaining ring 70 is pressed between the inner hub bearing 412 and the outer hub bearing 411, the assembled hub 40 assembly is then assembled onto the half-shaft sleeve 30, the nut locking plate 80 is installed on the outside, and then the locking nut 90 is installed and tightened according to the torque requirements of different product specifications. Finally, the retaining edge of the locking nut 90 is tapped into the keyway of the nut locking plate 80 for anti-loosening treatment.

[0039] The vehicle according to an embodiment of the present invention includes: the drive axle 2 described in the above embodiments.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] In the description of this invention, "first feature" and "second feature" may include one or more of the features. In the description of this invention, "a plurality of" means two or more. In the description of this invention, "above" or "below" the second feature may include direct contact between the first and second features, or it may include contact between the first and second features not being in direct contact but through another feature between them. In the description of this invention, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0042] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0043] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An oil seal (1), characterized in that, include: Oil seal body (10), wherein the oil seal body (10) is provided with a main lip (100); The support frame (20) is adapted to be connected to the hub bearing (410), the oil seal body (10) and the support frame (20) are rotatable relative to each other, and the main lip (100) is abutted against the support frame (20).

2. The oil seal (1) according to claim 1, characterized in that, The main lip (100) is provided with an oil return line (101), which is constructed as a bidirectional sine wave structure.

3. The oil seal (1) according to claim 2, characterized in that, The depth of the return oil line (101) gradually decreases in the direction toward the tip (102) of the main lip (100).

4. The oil seal (1) according to claim 2, characterized in that, The return oil line (101) includes an abutting part (103), which abuts against the support frame (20) when the lip tip (102) of the main lip (100) is pressed and deformed by the support frame (20).

5. The oil seal (1) according to claim 4, characterized in that, In the direction away from the tip (102) of the lip (100), the contact area of ​​the contact portion (103) gradually increases.

6. The oil seal (1) according to claim 4, characterized in that, The return oil line (101) further includes a pump suction section (104), which is connected to the side of the abutment portion (103) away from the lip tip (102) of the main lip (100). The cross-sectional area of ​​the pump suction section (104) gradually increases in the direction toward the abutment portion (103).

7. The oil seal (1) according to claim 1, characterized in that, The support frame (20) includes: a first bracket (200) and a second bracket (210), the first bracket (200) being adapted to be connected to the hub bearing (410), the main lip (100) being abutted against the first bracket (200), the second bracket (210) being connected to the first bracket (200), and the first bracket (200) and the second bracket (210) being vertically arranged.

8. The oil seal (1) according to claim 7, characterized in that, The oil seal body (10) is also provided with a first secondary lip (110) and a second secondary lip (120). The first secondary lip (110) is spaced apart from the first bracket (200), and the second secondary lip (120) is abutted against the second bracket (210).

9. A drive axle (2), characterized in that, include: Half-shaft sleeve (30); The hub (40) includes: a hub body (400) and a hub bearing (410), the hub body (400) is fixed on the half-shaft sleeve (30), and the hub bearing (410) is connected to the hub body (400); The oil seal (1) according to any one of claims 1-8, wherein the support frame (20) is connected to the wheel hub bearing (410).

10. A vehicle, characterized in that, include: The drive axle (2) as described in claim 9.

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