Hub bearing and machining process thereof

Abstract

The embodiment of the invention provides a hub bearing and a machining process thereof, and relates to the technical field of hub bearings. The hub bearing comprises an outer ring, a fixing ring, an inner ring and a flange, the outer ring is mounted on the circumferential outer wall of the inner ring, double rows of raceways are arranged in the outer ring, balls are mounted in the raceways through retainers, one end of the outer ring is connected with the fixing ring, one end of the inner ring is connected with the flange, and a gap between the outer ring and one end of the inner ring is sealed through a sealing ring. A gap between the other ends of the outer ring and the inner ring is sealed through a sealing adjusting mechanism which is installed on the inner ring. Dynamic self-adaptive sealing adjustment is achieved through a mechanical linkage structure of the floating ring, the lever arm and the sealing push ring, slope positioning matching and guide limiting design are combined, it is ensured that sealing pressure is automatically matched along with working conditions and evenly attached to a sealing groove, meanwhile, abrasion resistance and operation stability are improved, the sealing life is remarkably prolonged, and the overall reliability is remarkably improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of hub bearings, in particular to a hub bearing and a processing technology thereof. BACKGROUND

[0002] As a key component in the automobile transmission system, the hub bearing bears the important functions of supporting the wheel load, transmitting the driving force and ensuring the stable rotation of the wheel. With the continuous improvement of the performance requirements of automobiles, higher standards are put forward for the sealing, durability and running stability of the hub bearing.

[0003] The conventional hub bearing often faces the problem of poor adaptability of the sealing structure during use, especially in the case of complex and variable vehicle driving conditions. The fixed or passive sealing design is difficult to effectively cope with the sealing pressure fluctuation caused by the change of the pre-tightening force, and it is easy to cause the increase of friction loss and the over-high temperature rise due to the over-tight sealing, or the leakage of lubricating grease and the invasion of impurities due to the over-loose sealing, thereby affecting the bearing life and the safety of the whole vehicle.

[0004] In order to solve the above problems, although there are various improved sealing structures in the prior art, most of them rely on additional elastic elements or complex hydraulic / pneumatic adjustment systems, which not only have complex structures and high assembly difficulty, but also have high maintenance cost, and it is difficult to meet the needs of mass production and long-term stable operation.

[0005] Therefore, there is an urgent need for a new type of hub bearing with dynamic self-adaptive sealing capability, compact structure and strong process feasibility, so as to realize the real-time matching of the sealing performance and the working condition, and improve the reliability, durability and manufacturing efficiency of the product. SUMMARY

[0006] The application aims to at least solve the problem in the prior art that the fixed or passive sealing design is difficult to effectively cope with the sealing pressure fluctuation caused by the change of the pre-tightening force, and it is easy to cause the increase of friction loss and the over-high temperature rise due to the over-tight sealing, or the leakage of lubricating grease and the invasion of impurities due to the over-loose sealing, thereby affecting the bearing life and the safety of the whole vehicle. To this end, the application provides a hub bearing and a processing technology thereof.

[0007] To achieve the above-mentioned purpose, in one aspect, the application provides a hub bearing, which comprises an outer ring, a fixed ring, an inner ring and a flange, the outer ring is installed on the circumferential outer wall of the inner ring, a double-row raceway is arranged in the outer ring, and the rolling balls are installed in the raceway through the retainer, one end of the outer ring is connected with the fixed ring, one end of the inner ring is connected with the flange, the gap between the outer ring and one end of the inner ring is sealed by a sealing ring, and the gap between the other end of the outer ring and the inner ring is sealed by a sealing adjustment mechanism, the sealing adjustment mechanism is installed on the inner ring, and wherein:

[0008] The sealing adjusting mechanism comprises a floating ring which is axially slidably sleeved on the inner ring, one end of the floating ring is in contact with the flange, the outer wall of the inner ring is movably provided with at least three circumferentially distributed lever arms, one end of the lever arm is in contact with the floating ring, and the other end of the lever arm is connected to a sealing push ring, one side of the sealing push ring is in contact with one side of a sealing lip, and the sealing lip is arranged in a sealing groove of the outer ring.

[0009] Further, the middle part of each lever arm is fixed to the inner ring through a hinge pin, and the hinge pin is a hollow pin which is riveted at both ends in the mounting hole of the inner ring.

[0010] Further, the lever arm is in an L-shaped structure, one end of the lever arm is provided with a roller which is in contact with the floating ring, and the other end of the lever arm is movably connected with a sliding block which is arranged in a sliding groove arranged on the other side of the sealing push ring.

[0011] Further, the sealing lip is in a corrugated rubber structure, and a metal ring is embedded in the root of the sealing lip and clamped in the sealing groove.

[0012] Further, the inner wall of the sealing push ring is provided with a slope which is located inside the sealing lip and causes the sealing lip to radially expand when the sealing push ring is pushed.

[0013] Further, one side of the sealing push ring is provided with a plurality of positioning strips I, and an insertion slot is formed between two adjacent positioning strips I, and a positioning strip II on one side of the sealing lip is inserted into the insertion slot.

[0014] Further, the inner wall of the floating ring is provided with a guide block which is slidably arranged in a guide groove arranged on the outer wall of the inner ring.

[0015] Further, a return spring is connected between the floating ring and the flange.

[0016] Further, an annular groove is arranged on one side of the flange, a wear-resistant sheet is arranged in the annular groove, one side of the floating ring is provided with a convex ring which is slidably connected with the wear-resistant sheet.

[0017] Further, on the other hand, the application also provides a wheel hub bearing machining process, comprising the wheel hub bearing of any one of the above-mentioned embodiments, and comprising the following steps:

[0018] S1, the lever arm is fixed to the outer wall of the inner ring through the hinge pin, the hinge pin is a hollow pin structure which is riveted at both ends, and the lever arm can be flexibly rotated around the hinge pin;

[0019] S2, the floating ring is slidably sleeved on the outer wall of the inner ring, and the floating ring is in contact with the end face of the flange, the inner wall of the floating ring is provided with a guide block which is slidably arranged in a guide groove arranged on the inner ring, one end of the lever arm is provided with a roller which is in contact with the end face of the floating ring, and the linkage function is realized;

[0020] S3, the sealing push ring is sleeved into the inner ring, one side of the positioning strip one forms a insertion slot, and the positioning strip two on one side of the sealing lip is inserted and matched, the inner wall of the sealing push ring is provided with a slope structure, which promotes the radial expansion of the sealing lip during pushing;

[0021] S4, the outer ring is pressed onto the inner ring assembly, the outer ring is provided with a sealing groove, and the installed sealing lip is embedded in the sealing groove in an interference fit manner during the pressing process, so as to ensure that the sealing structure is tight and reliable.

[0022] The beneficial effects of the present application are: through the pure mechanical linkage structure of the floating ring, the lever arm and the sealing push ring, dynamic self-adaptive sealing adjustment of the pre-tightening force change is realized. When the pre-tightening force increases, the axial movement of the floating ring drives the rotation of the lever arm, which promotes the radial expansion of the sealing push ring and increases the compression amount of the sealing lip; when the pre-tightening force decreases, the reset spring pushes the floating ring to reset, reducing the sealing pressure. This design ensures that the sealing pressure always matches the working condition, effectively avoids the high friction loss caused by over-tightening or the leakage risk caused by over-looseness of the traditional sealing, the inner wall of the sealing push ring is provided with a slope, which cooperates with the positioning strip one and the positioning strip two, and can make the sealing lip of the corrugated rubber structure uniformly expand radially during pushing, ensuring that it is tightly fitted with the outer ring sealing groove, preventing lubricating oil leakage and external impurities from entering, the inner wall of the floating ring is provided with a guide block, which is slidingly matched with the guide groove on the inner ring, ensuring the stability and centring of the floating ring during movement, avoiding deviation or jamming phenomenon, prolonging the service life of the component, the flange is provided with an annular groove and embedded with a wear-resistant piece, the end of the floating ring is provided with a convex ring which is slidingly connected with the flange, effectively reducing friction and wear, improving the durability and working stability of the overall bearing assembly.

[0023] Additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by practicing the present application. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creating any creative labor on the basis of these drawings.

[0025] Figure 1 is a schematic diagram of the overall structure according to the embodiments of the present application;

[0026] Figure 2 is a schematic diagram of the overall structure according to the embodiments of the present application;

[0027] Figure 3 is a schematic diagram of the overall structure according to the embodiments of the present application;

[0028] Figure 4 is a schematic view of a sealing groove according to an embodiment of the present application;

[0029] Figure 5 is a schematic view of a structure of a sealing adjusting mechanism according to an embodiment of the present application;

[0030] Figure 6 is a schematic view of a split of a floating ring, a sealing push ring and a sealing lip according to an embodiment of the present application;

[0031] Figure 7 is a schematic view of a structure of a floating ring according to an embodiment of the present application;

[0032] Figure 8 is a schematic view of a structure of a sealing push ring according to an embodiment of the present application;

[0033] Figure 9 is a schematic view of a structure of a sealing lip according to an embodiment of the present application;

[0034] Figure 10 is a schematic view of a structure of a flange according to an embodiment of the present application.

[0035] Figure:

[0036] 1, outer ring; 11, sealing groove; 2, fixed ring; 3, raceway; 4, inner ring; 41, guide groove; 5, ball; 6, flange; 61, annular groove; 62, wear plate; 7, sealing ring; 8, sealing adjusting mechanism; 81, lever arm; 82, roller; 83, sliding block; 84, floating ring; 841, guide block; 842, convex ring; 843, return spring; 85, sealing push ring; 851, slope; 852, sliding groove; 86, positioning bar one; 87, sealing lip; 88, metal ring; 89, positioning bar two. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

[0038] A hub bearing and a processing technology thereof according to an embodiment of the present application will be described below with reference to the drawings.

[0039] As shown in Figures 1-10 A hub bearing according to an embodiment of the present application includes an outer ring 1, a fixed ring 2, an inner ring 4 and a flange 6. The outer ring 1 is mounted on the circumferential outer wall of the inner ring 4 and forms a cooperation relationship with it. A double-row raceway 3 is arranged inside the outer ring 1. Balls 5 are evenly distributed and mounted in the raceway 3 through a retainer, so as to realize the rolling connection between the inner and outer rings. One end of the outer ring 1 is axially positioned and fixed through the fixed ring 2, and one end of the inner ring 4 is connected with the flange 6, which is used for assembly connection with other components, so as to constitute a complete hub bearing overall structure.

[0040] In the sealing structure, a sealing ring 7 is installed at the gap between the outer ring 1 and one end of the inner ring 4, and a sealing adjusting mechanism 8 is arranged at the gap of the other end, which is installed on the inner ring 4 and can adjust the sealing state according to the use requirements. The two sealing structures work together to form double sealing protection, effectively prevent dust, moisture and other external pollutants from entering the bearing, and ensure the long-term stable operation of the bearing under complex working conditions, thereby improving the service life and reliability of the bearing.

[0041] The sealing adjusting mechanism 8 includes a floating ring 84 which is axially slidably sleeved on the inner ring 4 and in contact with one end of the flange 6 to realize axial positioning. At least three lever arms 81 are uniformly distributed in the circumferential direction and movably installed on the outer wall of the inner ring 4. The middle part of each lever arm 81 is rotatably connected to the inner ring 4 by a hinge shaft. The hinge shaft adopts a hollow pin structure, and its two ends are riveted and fixed in the mounting hole of the inner ring 4. The middle part of the lever arm 81 is provided with a through hole which is sleeved on the hollow pin and can freely swing within a certain range.

[0042] The lever arm 81 is in an "L" shape structure, one end of which is provided with a roller 82 which is in contact with the surface of the floating ring 84 to reduce the friction therebetween, and the other end is movably connected with a sliding block 83 which is embedded in a sliding groove 852 provided on one side of a sealing push ring 85 and can slide therein, thereby realizing the linkage between the lever arm 81 and the sealing push ring 85.

[0043] One side of the sealing push ring 85 is in contact with a sealing lip 87 which adopts a corrugated rubber structure, and a metal ring 88 is embedded at the root of the sealing lip 87 and clamped in a sealing groove 11 provided in the end of the outer ring 1 to enhance the overall rigidity and anti-deformation ability of the sealing lip 87 and avoid the problems of collapse or failure of the traditional rubber sealing lip 87 due to uneven stress.

[0044] Through the above structure design, a pure mechanical linkage relationship is formed between the floating ring 84, the lever arm 81 and the sealing push ring 85. When the bearing is subjected to a change in pre-tightening force from the flange 6, the axial displacement is transmitted to the lever arm 81 through the floating ring 84 and further converted into the radial displacement of the sealing push ring 85, which drives the sealing lip 87 to change accordingly, thereby realizing the self-adaptive adjustment function of "increasing pre-tightening force → enhancing sealing pressure". This structure not only improves the sealing performance of the bearing, but also dynamically adjusts the sealing state according to the actual working condition, ensures the clean and stable internal environment of the bearing, and prolongs the service life.

[0045] The inner wall of the sealing push ring 85 is provided with a slope 851 structure located at a position corresponding to the sealing lip 87. When the sealing push ring 85 moves axially, the inner slope 851 exerts a force on the sealing lip 87, causing the sealing lip 87 to expand radially, thereby enhancing the sealing effect.

[0046] A plurality of positioning bars one 86 are arranged on the outer circumferential surface of one side of the sealing push ring 85 and are spaced apart in the circumferential direction, and a slot structure is formed between two adjacent positioning bars one 86. The sealing lip 87 is provided with a positioning bar two 89 at a corresponding position, and the positioning bar two 89 can be inserted into the slot, thereby realizing stable connection between the sealing push ring 85 and the sealing lip 87 and ensuring that the two are synchronized during movement.

[0047] The inner wall of the floating ring 84 is provided with a guide block 841 which is slidingly fitted in a guide groove 41 formed on the outer wall of the inner ring 4, so that the floating ring 84 maintains good guidance and stability during axial movement, preventing deviation, jamming and rotation.

[0048] To further improve the adaptability of the sealing adjustment mechanism 8, a return spring 843 is arranged between the floating ring 84 and the flange 6. The return spring 843 can provide elastic compensation when the bearing expands due to temperature rise, maintain the initial pre-tightening force, avoid sealing failure caused by high temperature, and ensure the continuous stability of the sealing performance.

[0049] In addition, an annular groove 61 is arranged on one side of the flange 6, and a wear-resistant sheet 62 is embedded in the annular groove 61 to improve the wear resistance of the contact surface. The side of the floating ring 84 close to the flange 6 is provided with a convex ring 842 which forms a sliding fit with the wear-resistant sheet 62, further improving the stability and durability of the floating ring 84 during axial movement.

[0050] On the other hand, the present application also provides a hub bearing machining process, and the operation steps are as follows:

[0051] S1, the lever arm 81 is fixed to the outer wall of the inner ring 4 through a hinge pin, which is a hollow pin structure with both ends riveted, ensuring that the lever arm 81 can rotate flexibly around the hinge shaft;

[0052] S2, the floating ring 84 is slidingly sleeved on the outer wall of the inner ring 4 and is in contact with the end face of the flange 6. The inner wall of the floating ring 84 is provided with a guide block 841 which cooperates with the guide groove 41 on the inner ring 4 to slide. The one end of the lever arm 81 is provided with a roller 82 which is in contact with the end face of the floating ring 84, realizing the linkage function;

[0053] S3, the sealing push ring 85 is sleeved on the inner ring 4, and the slot formed by the positioning bar one 86 on one side of the sealing push ring 85 is inserted and fitted with the positioning bar two 89 on one side of the sealing lip 87. The inner wall of the sealing push ring 85 is provided with a slope 851 structure which causes the sealing lip 87 to expand radially when pushed.

[0054] S4, the outer ring 1 is pressed to the inner ring 4 assembly, the outer ring 1 is provided with a sealing groove 11, the installed sealing lip 87 is embedded in the sealing groove 11 in an interference fit manner during the pressing process, ensuring that the sealing structure is tight and reliable.

[0055] Workflow: When the flange 6 is subjected to axial pre-tightening force, the floating ring 84 moves, the lever arm 81 swings, and the sealing push ring 85 is expanded radially by the slider 83, so that the sealing lip 87 is tightly attached to the inner wall of the outer ring 1, and the sealing pressure is enhanced. At the same time, the slope 851 structure inside the sealing push ring 85 further promotes the expansion of the sealing lip 87, and improves the sealing effect. The floating ring 84 slides in the guide groove 41 and is compensated by the reset spring 843 for thermal expansion displacement, ensuring that the sealing system is always in a stable working state, realizing the dynamic sealing function of "pre-tightening force change → sealing pressure self-adaptive adjustment".

[0056] The above is only an embodiment of the present application and does not limit the protection scope of the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0057] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A wheel hub bearing, characterized in that: The invention comprises an outer ring (1), a fixing ring (2), an inner ring (4) and a flange (6), wherein the outer ring (1) is mounted on the circumferential outer wall of the inner ring (4), a double-row raceway (3) is provided in the outer ring (1), and balls (5) are mounted in the raceway (3) through a retaining frame, one end of the outer ring (1) is connected to the fixing ring (2), one end of the inner ring (4) is connected to the flange (6), a gap between the outer ring (1) and one end of the inner ring (4) is sealed by a sealing ring (7), and a gap between the outer ring (1) and the other end of the inner ring (4) is sealed by a sealing adjustment mechanism (8), and the sealing adjustment mechanism (8) is mounted on the inner ring (4), wherein: The sealing adjustment mechanism (8) includes a floating ring (84) axially slidingly mounted on the inner ring (4), one end of which contacts the flange (6), and at least three circumferentially evenly distributed lever arms (81) are movably mounted on the outer wall of the inner ring (4), one end of the lever arm (81) contacts the floating ring (84), and the other end is connected to the sealing push ring (85), one side of the sealing push ring (85) is in contact with one side of the sealing lip (87), and the sealing lip (87) is installed in the sealing groove (11) opened in the outer ring (1).

2. The wheel hub bearing according to claim 1, characterized in that: The middle part of each lever arm (81) is fixed to the inner ring (4) through a hinge shaft, and the hinge pin is a hollow pin with both ends riveted into the mounting holes of the inner ring (4).

3. The wheel hub bearing according to claim 2, characterized in that: The lever arm (81) is in an L-shaped structure. A roller (82) is provided at one end of the lever arm (81), and the roller (82) contacts the floating ring (84). The other end of the lever arm (81) is movably connected to a slider (83), and the slider (83) is located in a slide groove (852) opened on the other side of the sealing push ring (85).

4. The wheel hub bearing according to claim 1, characterized in that: The sealing lip (87) is a corrugated rubber structure, with a metal ring (88) embedded at the root, and the metal ring (88) is clamped in the sealing groove (11).

5. The wheel hub bearing according to claim 1, characterized in that: The inner wall of the sealing push ring (85) is provided with a slope (851), which is located inside the sealing lip (87) and causes the sealing lip (87) to expand radially when pushed.

6. The wheel hub bearing according to claim 5, characterized in that: A plurality of positioning strips (86) are provided on one side of the sealing push ring (85), a slot is formed between two adjacent positioning strips (86), and a positioning strip (89) on one side of the sealing lip (87) is inserted into the slot.

7. The wheel hub bearing according to claim 1, characterized in that: The inner wall of the floating ring (84) is provided with a guide block (841), and the guide block (841) slides in a guide groove (41) provided on the outer wall of the inner ring (4).

8. The wheel hub bearing according to claim 7, characterized in that: A return spring (843) is connected between the floating ring (84) and the flange (6).

9. The wheel hub bearing according to claim 1, characterized in that: An annular groove (61) is provided on one side of the flange (6), a wear-resistant sheet (62) is provided in the annular groove (61), a convex ring (842) is provided on one side of the floating ring (84), and the convex ring (842) is slidably connected to the wear-resistant sheet (62).

10. A wheel hub bearing processing process, comprising the wheel hub bearing according to any one of claims 1 to 9, characterized in that: The steps include: S1. Fix the lever arm (81) to the outer wall of the inner ring (4) through a hinge pin. The hinge pin is a hollow pin structure with riveted ends to ensure that the lever arm (81) can rotate flexibly around the hinge axis; S2. The floating ring (84) is slidably mounted on the outer wall of the inner ring (4), and the floating ring (84) is brought into contact with the end face of the flange (6). A guide block (841) is provided on the inner wall of the floating ring (84), which slides in cooperation with the guide groove (41) on the inner ring (4). A roller (82) is provided at one end of the lever arm (81), which contacts the end face of the floating ring (84), thereby realizing a linkage function. S3, insert the sealing push ring (85) into the inner ring (4), and the slot formed by the first positioning strip (86) on one side thereof is plugged into the second positioning strip (89) on the side of the sealing lip (87). The inner wall of the sealing push ring (85) is provided with a slope (851) structure, which causes the sealing lip (87) to expand radially when pushed; S4. Press the outer ring (1) onto the inner ring (4) assembly. The outer ring (1) is provided with a sealing groove (11). During the press-fitting process, the installed sealing lip (87) is embedded in the sealing groove (11) in an interference fit manner to ensure that the sealing structure is tight and reliable.

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