Precisely matched hub unit

Abstract

The utility model provides a precisely-matched hub unit which comprises a mandrel, an inner ring fixedly sleeved on the periphery of the mandrel, an outer ring sleeved on the periphery of the mandrel and the inner ring, a rotating annular gap formed among the outer ring, the mandrel and the inner ring, a retainer group arranged in the rotating annular gap, a plurality of rolling bodies rotationally arranged on the retainer group, and a plurality of rolling bodies rotationally arranged on the retainer group. A non-base surface sealing piece is plugged in a front end opening of the rotating annular space, a magnetic reverse gland is plugged in a rear end opening of the rotating annular space, a gland covers the rear ends of the mandrel, the inner ring and the outer ring, the periphery of the gland is bent to form a ring edge, the ring edge extends into the rotating annular space and is attached to the inner wall of the outer ring, and a sealing ring wraps the bent position, connected with the ring edge, of the gland. The first edge of the sealing ring extends between the outer wall of the ring edge and the inner wall of the outer ring, and the second edge of the sealing ring is flush with the plane of the gland. The specific structure of the sealing ring is adopted, and the included angle notch is designed in the specific position of the sealing ring, so that the shape and range of easy bending deformation of the sealing ring are adjusted, the sealing ring is more adaptive to the gap structure, and the sealing effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery, and relates to an automobile wheel hub, in particular to a hub unit with precise fit. Background Art

[0002] The function of an automobile hub unit is to bear the weight and provide precise guidance for the rotation of the wheel hub. It bears both axial load and radial load, and is one of the very critical components in an automobile. The service life of the bearing is the direct data for measuring the product quality, and improving the bearing service life is the main technical difficulty at present.

[0003] In the design of traditional hub units, the combination of the mandrel, inner ring and outer ring is often not fully optimized, resulting in limited sealing effect and durability of the unit under high-speed rotation and deformation load. This deficiency may cause leakage of lubricant and entry of external contaminants, thereby affecting the rolling efficiency and service life of the bearing.

[0004] In the existing sealing structure of the magnetic counter-pressure cover in the hub structure, the sealing structure usually affects the penetration of magnetic lines of force, thereby reducing the induction effect of the sensor; in addition, in the traditional structure, the sealing effect between the gland and the outer ring needs to be improved, and it is still impossible to completely prevent the entry of external contamination or the overflow of internal lubricating oil. Summary of the Utility Model

[0005] The purpose of the utility model is to propose a hub unit with precise fit in view of the above problems existing in the prior art.

[0006] The purpose of the utility model can be achieved by the following technical solutions: a hub unit with precise fit includes a mandrel, an inner ring is fixedly sleeved on the outer periphery of the mandrel, an outer ring is sleeved on the outer periphery of the mandrel and the inner ring, a rotating annular gap is formed between the outer ring and the mandrel and the inner ring, a cage group is arranged in the rotating annular gap, a plurality of rolling elements are rotatably arranged on the cage group, a non-base surface seal is blocked in the front port of the rotating annular gap, a magnetic counter-pressure cover is blocked in the rear port of the rotating annular gap, a gland is sleeved on the rear ends of the mandrel, inner ring and outer ring, a ring edge is formed by bending the periphery of the gland, the ring edge extends into the rotating annular gap and adheres to the inner wall of the outer ring, a sealing ring is wrapped at the bending part where the gland is connected to the ring edge, the first edge of the sealing ring extends into the space between the outer wall of the ring edge and the inner wall of the outer ring, and the second edge of the sealing ring is flush with the plane of the gland.

[0007] In the above hub unit with precise fit, the gland is integrally connected to the ring edge through an arc chamfer, the sealing ring wraps the arc chamfer, the inner circumference of the sealing ring has an arc surface, the arc surface closely adheres to the outer peripheral surface of the arc chamfer, and an annular step is recessed on the outer peripheral surface of the sealing ring.

[0008] In the above-mentioned precision-fitted hub unit, a 90° angle is formed between the first edge and the second edge of the sealing ring, and the annular step is arranged between the first edge and the second edge to form an angular notch.

[0009] In the above-mentioned precision-fitted hub unit, the angle of the angular notch is not less than 90°, a right angle or an obtuse angle is formed between the first step surface of the annular step and the first edge, and a right angle is formed between the second step surface of the annular step and the second edge.

[0010] In the above-mentioned precision-fitted hub unit, the first step surface and the first edge are connected by a sharp angle, the second step surface and the second edge are connected by a rounded corner, and the first step surface and the second step surface are connected by a sharp angle.

[0011] In the above-mentioned precision-fitted hub unit, the gland is a disc-shaped cover body, the middle of the gland has a disc bottom in the shape of a conical shell, the outer periphery of the disc bottom is turned outwards to form a disc edge in the shape of an annular plane, and the periphery of the disc edge is connected to the ring edge.

[0012] In the above-mentioned precision-fitted hub unit, the second edge of the sealing ring is flush with the outer surface of the disc edge.

[0013] In the above-mentioned precision-fitted hub unit, the rotating annular gap is a bent annular channel, a first raceway and a second raceway are arranged at intervals in the annular channel, the cage group includes cage A and cage B, cage A is arranged in the first raceway, and cage B is arranged in the second raceway.

[0014] In the above-mentioned precision-fitted hub unit, a counterbore is recessed on the front end surface of the mandrel, the counterbore has a stepped flared opening, and an arc-shaped pit is recessed on the bottom surface of the stepped flared opening.

[0015] In the above-mentioned precision-fitted hub unit, a flange is arranged on the outer periphery of the front end of the mandrel, mounting holes are arranged on the flange, and bolts are inserted through the mounting holes; a second flange is provided on the outer ring, and threaded holes are provided on the second flange.

[0016] Compared with the prior art, the precision-fitted hub unit has the following beneficial effects:

[0017] 1. By matching a sealing ring on the gland, adopting a specific structure of the sealing ring, and designing an angular notch at a specific position of the sealing ring, the form and range of the easily bent and deformed sealing ring are adjusted, so that the sealing ring is more adapted to the gap structure, further improving the sealing pre-tightening force, enhancing the sealing effect, effectively blocking the impact and erosion of larger impurities, and extending the service life.

[0018] 2. A sealing ring is used in cooperation with a gland, and the position of the sealing ring corresponds to the position of the magnetic back gland, so as to improve the signal transmission intensity of the magnetic back gland, facilitating the sensor to sense accurate data. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an overall sectional view structure diagram of the hub unit with precise fit.

[0020] Figure 2 It is a partial enlarged structure diagram of the hub unit with precise fit.

[0021] In the figure, 1. mandrel; 2. non-base surface seal; 3. rolling element; 4. cage A; 5. outer ring; 6. cage B; 7. inner ring; 8. magnetic back gland; 9. gland; 9a. bottom of the disc; 9b. edge of the disc; 9c. ring edge; 10. sealing ring; 10a. first edge; 10b. second edge; 10c. first step surface; 10d. second step surface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0023] As Figures 1 to 2 shown, the hub unit with precise fit includes a mandrel 1. An inner ring 7 is fixedly sleeved on the outer periphery of the mandrel 1. An outer ring 5 is sleeved on the outer peripheries of the mandrel 1 and the inner ring 7. A rotating annular gap is formed between the outer ring 5 and the mandrel 1 and the inner ring 7. A cage group is arranged in the rotating annular gap. A plurality of rolling elements 3 are rotatably arranged on the cage group. A non-base surface seal 2 is blocked in the front port of the rotating annular gap. A magnetic back gland 8 is blocked in the rear port of the rotating annular gap. A gland 9 is sleeved on the rear ends of the mandrel 1, the inner ring 7 and the outer ring 5. The periphery of the gland 9 is bent to form a ring edge 9c. The ring edge 9c extends into the rotating annular gap and adheres to the inner wall of the outer ring 5. The bent part of the gland 9 connecting the ring edge 9c wraps the sealing ring 10. The first edge 10a of the sealing ring 10 extends into the space between the outer wall of the ring edge 9c and the inner wall of the outer ring 5. The second edge 10b of the sealing ring 10 is flush with the plane of the gland 9.

[0024] The inner ring 7 is press-fitted on the mandrel 1 and fixed on the mandrel 1 by interference fit. The mandrel 1 locks the inner ring 7 by curling to determine the product clearance, enabling the product to be quickly installed without adjusting the clearance amount. The magnetic back gland 8 is press-fitted on the inner ring 7, and the gland 9 is press-fitted on the outer ring 5. There is a certain gap between the magnetic back gland 8 and the gland 9 to ensure no interference during rotation.

[0025] As Figure 2As shown, preferably, the gland 9 is integrally connected to the ring edge 9c through an arc chamfer. The sealing ring 10 covers the arc chamfer. The inner circumference of the sealing ring 10 has an arc surface, and the arc surface closely adheres to the outer circumferential surface of the arc chamfer. An annular step is recessed on the outer circumferential surface of the sealing ring 10. The sealing ring 10 is made of rubber to form a circular ring seal. The rubber is fixed to the gland 9 by vulcanization. By using the elasticity of the rubber, after assembly, it closely adheres to the gland 9 on the inner side and to the outer ring 5 on the outer side, thereby improving the sealing effect.

[0026] As Figure 2 shown, preferably, a 90° angle is formed between the first edge 10a and the second edge 10b of the sealing ring 10. The annular step is arranged in the angle notch formed between the first edge 10a and the second edge 10b. Preferably, the angle of the angle notch is not less than 90°. The first step surface 10c of the annular step is connected to the first edge 10a to form a right angle or an obtuse angle, and the second step surface 10d of the annular step is connected to the second edge 10b to form a right angle. By setting the angle notch formed by the annular step, a weak point is formed at the notch position, so as to increase the elastic deformation range of the first edge 10a of the sealing ring 10 and improve the sealing effect on the gap between the gland 9 and the outer ring 5.

[0027] As Figure 2 shown, preferably, the first step surface 10c is connected to the first edge 10a through a sharp angle, the second step surface 10d is connected to the second edge 10b through a rounded corner, and the first step surface 10c is connected to the second step surface 10d through a sharp angle. The rounded corner transition increases the support strength, and the sharp angle connection improves the deformation ability of bending. There is a sharp angle between the first step surface 10c and the second step surface 10d, making it easier for the two sides of the angle notch to overlap, increasing the expansion angle range of the first edge 10a of the sealing ring 10, and improving the sealing pre-tightening force.

[0028] As Figure 1 shown, preferably, the gland 9 is a disc-shaped cover body. The middle part of the gland 9 has a disc bottom 9a in the shape of a conical shell. The outer circumference of the disc bottom 9a is turned outwards to form a disc edge 9b in the shape of an annular plane, and the periphery of the disc edge 9b is connected to the ring edge 9c. The disc-shaped cover body of the gland 9 is used to match the assembly structure. The disc bottom 9a of the conical shell covers the rear ends of the mandrel 1 and the inner ring 7, and the disc edge 9b of the annular plane abuts against the magnetic back gland 8 and blocks the rear port of the rotating ring gap. Thus, the characteristics of the disc-shaped cover body are used to cooperate with the structural characteristics of the rear ends of the mandrel 1, the inner ring 7 and the outer ring 5.

[0029] As Figure 1 shown, preferably, the second edge 10b of the sealing ring 10 is flush with the outer surface of the disc edge 9b. Making the outer side surface of the sealing ring 10 flush with a part of the surface of the gland 9 can not only achieve a flat appearance structure but also avoid damage to the sealing ring 10 such as corrosion caused by the accumulation of pollutants at uneven heights.

[0030] As Figure 1 shown, preferably, the rotating annular gap is a bent annular channel, and a first raceway and a second raceway are arranged at intervals in the annular channel. The cage group includes cage A4 and cage B6. Cage A4 is arranged in the first raceway, and cage B6 is arranged in the second raceway.

[0031] The cages assist the two rows of rolling elements 3 to be evenly distributed on the raceways; cage A4 and cage B6 have different sizes, and there is a certain clearance between the cages and the rolling elements 3. There is a raceway on the outer circumference of the mandrel 1, and the raceway is surface hardened locally to increase its hardness and wear resistance. There is a row of raceways on the outer circumference of the inner ring 7, and the raceway is hardened integrally to increase its hardness and wear resistance. There are two rows of raceways on the outer ring 5 for supporting the rotation of the rolling elements 3. The curvatures of the two rows of raceways are different, and the raceways are surface hardened locally to increase their hardness and wear resistance.

[0032] The structure of a double row angular contact bearing is formed inside the hub unit, so that it can bear both axial load and radial load. The two rows of rolling elements 3 have different pitch circle characteristics, which can adjust the force center and effectively improve the service life of the hub bearing unit.

[0033] As Figure 1 shown, preferably, a counterbore is recessed on the front end face of the mandrel 1, the counterbore has a stepped flared opening, and an arc-shaped pit is recessed on the bottom surface of the stepped flared opening. Through the design of the counterbore in the middle of the mandrel 1, the weight of the mandrel 1 is reduced.

[0034] As Figure 1 shown, preferably, a first flange is provided on the outer periphery of the front end of the mandrel 1, mounting holes are provided on the flange, and bolts are inserted through the mounting holes; a second flange is provided on the outer ring 5, and threaded holes are provided on the second flange. By providing a certain number of mounting holes on the first flange and press-fitting bolts one by one in the holes, a plurality of bolts are used to connect the hub unit to the brake disc and the hub. During installation, the bolts are inserted through the threaded holes of the second flange to connect the hub unit to the steering knuckle and fix it on the vehicle chassis.

[0035] This hub unit with precise fit has the following improved features:

[0036] At the front port position of the rotating annular gap, the fitting clearance between the outer ring 5 and the mandrel 1 is small, and the non-base surface seal 2 is fitted inside the outer ring 5 and the mandrel 1, effectively blocking the impact and erosion of larger impurities and playing a protective role. In short, the gland 9 and the non-base surface seal 2 form a sealed space inside the hub unit to prevent the leakage of grease and the entry of external impurities. The outer diameter of the outer ring 5 is designed with a mud guiding water groove to reduce the contact of mud and water with the sealing lip and improve the service life of the seal.

[0037] The raceways of the outer ring 5 are designed with the same curvature and different contact angles, so that the two rows of rolling elements 3 are evenly stressed under the loaded state, thereby improving the service life of the hub unit. The contact parts of the raceways of the outer ring 5, the raceways of the spindle 1, and the raceways of the inner ring 7 all adopt heat treatment processes to increase hardness, improve the overall mechanical properties, increase the roughness of the contact surface, and reduce the amount of mating deformation.

[0038] The gland 9 is made of austenitic stainless steel and will not exhibit obvious magnetism in a magnetic field, enabling the magnetic field lines to penetrate smoothly and preventing the internal magnetic counter-gland 8 from being exposed externally. The sealing ring 10 is made of rubber and is arranged at the mating part of the gland 9 and the outer ring 5. The sensor can remotely receive the signal of the magnetic counter-gland 8 through the characteristics of the material of the gland 9. The signal transmission intensity is increased through the rubber sealing ring 10, and the sealing performance is improved, so that only one seal is required when the product rotates relatively.

[0039] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the defined scope. Although the present invention has been described in detail in the drawings and the foregoing description, such description is considered to be illustrative or exemplary rather than restrictive. It should be understood that within the scope of the following claims, those of ordinary skill in the art can make changes and modifications. Specifically, the present invention encompasses additional embodiments having any combination of features from the different embodiments described above. With respect to the use of the expressions "generally" or "substantially", this patent application should be understood to disclose that the same fully meets these features and values, i.e., without the foregoing being characterized as "generally" or "substantially".

[0040] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A precision-matched hub unit, comprising a core shaft, the outer periphery of the core shaft is fixedly sleeved with an inner ring, the core shaft and the outer periphery of the inner ring are sleeved with an outer ring, a rotating annular gap is formed between the outer ring, the core shaft and the inner ring, a retaining frame group is arranged in the rotating annular gap, and a plurality of rolling bodies are rotatably arranged on the retaining frame group, characterized in that: The front port of the rotating annular gap is sealed with a non-base surface seal, the rear port of the rotating annular gap is sealed with a magnetic counter-pressure cover, the rear ends of the core shaft, the inner ring and the outer ring are covered with a pressure cover, the periphery of the pressure cover is bent to form a ring edge, the ring edge extends into the rotating annular gap and is attached to the inner wall of the outer ring, the pressure cover is connected to the bending part of the ring edge and is attached to a sealing ring, the first edge of the sealing ring extends between the outer wall of the ring edge and the inner wall of the outer ring, and the second edge of the sealing ring is flush with the plane of the pressure cover.

2. The precision-fit hub unit according to claim 1, characterized in that: The pressure cover is integrally connected with the ring edge through a circular chamfer, the sealing ring covers the circular chamfer, the inner circumference of the sealing ring has a circular surface, the circular surface is closely attached to the outer circumferential surface of the circular chamfer, and an annular step is concavely arranged on the outer circumferential surface of the sealing ring.

3. The precision-fit hub unit according to claim 2, characterized in that: A 90° angle is formed between the first edge and the second edge of the sealing ring, and the annular step is arranged between the first edge and the second edge to form an angle gap.

4. The precision-fit hub unit according to claim 3, characterized in that: The angle of the angled notch is not less than 90°, the first step surface of the annular step is connected with the first edge to form a right angle or an obtuse angle, and the second step surface of the annular step is connected with the second edge to form a right angle.

5. The precision-fit hub unit according to claim 4, characterized in that: The first step surface is connected to the first edge via a sharp corner, the second step surface is connected to the second edge via a rounded corner, and the first step surface is connected to the second step surface via a sharp corner.

6. The precision-fit hub unit according to claim 1, characterized in that: The gland is a disc-shaped cover body, and the middle part of the gland has a disc bottom in the form of a conical shell, the outer periphery of the disc bottom is folded outward to form a disc edge in an annular plane, and the periphery of the disc edge is connected to the ring edge.

7. The precision-fit hub unit according to claim 6, characterized in that: The second edge of the sealing ring is flush with the outer surface of the disk edge.

8. The precision-fit hub unit according to claim 1, characterized in that: The rotating annular gap is a bent annular channel, in which raceway 1 and raceway 2 are arranged at intervals. The retainer group includes retainer A and retainer B. Retainer A is arranged in raceway 1, and retainer B is arranged in raceway 2.

9. The precision-fit hub unit according to claim 1, characterized in that: The front end surface of the core shaft is concavely provided with a countersunk hole, the countersunk hole has a stepped expansion, and the bottom surface of the stepped expansion is concavely provided with an arc surface pit.

10. The precision-fit hub unit according to claim 1, characterized in that: A flange is arranged on the outer periphery of the front end of the core shaft, a mounting hole is arranged on the flange, and bolts are inserted into the mounting hole; a second flange is arranged on the outer ring, and a threaded hole is arranged on the second flange.

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