Hub unit with optimized matching

Abstract

The utility model provides a hub unit with optimized matching, 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 space formed among the outer ring, the mandrel and the inner ring, a retainer arranged in the rotating annular space, and a rolling body rotatably arranged on the retainer. One end of the rotating annular space sequentially blocks the base surface sealing piece and the magnetic reverse gland from inside to outside, and the outer end surface of the magnetic reverse gland is pressed and attached to the inner ring end surface and the outer ring end surface; the other end of the rotating annular space blocks the non-base-plane sealing piece, the non-base-plane sealing piece is provided with a blocking part and a sleeve body, the blocking part is arranged in a port of the rotating annular space, the sleeve body extends out of the port of the rotating annular space and wraps part of the outer wall of the outer ring, and the edge of the sleeve body is turned outwards to form a blocking edge. Through the special design that the non-basal plane sealing piece is bent in multiple directions and the design that the non-basal plane sealing piece is matched with the mandrel and multiple lips are adopted, the sealing performance is improved. And meanwhile, the blocking edge effectively increases the strength and improves the pre-tightening force attached to the outer wall surface of the outer ring.

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 optimized fit. Background Technique

[0002] The function of the 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 key components in the automobile. The service life of the bearing is the direct data for measuring the product quality, and improving the bearing life is the main technical difficulty at present.

[0003] In the traditional hub unit design, 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 pollutants, thus affecting the rolling efficiency and life of the bearing.

[0004] First of all, during the long-term use of the existing hub unit, due to external force influence and temperature change, the seals of the hub with traditional structure are prone to aging and damage, resulting in reduced sealing effect. This not only increases the maintenance cost but also may lead to mechanical failures.

[0005] Secondly, the hub unit in the traditional design usually does not consider the optimization of the sealing structure, so that the sealing performance cannot be guaranteed under extreme working conditions. This limits the wide application of the hub unit, especially in the application scenarios of high speed and high load. Content of the Utility Model

[0006] The purpose of the utility model is to provide a hub unit with optimized fit in view of the above problems existing in the current technology.

[0007] The purpose of the utility model can be achieved by the following technical solutions: A hub unit with optimized 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 peripheries 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 is arranged in the rotating annular gap. Rolling elements are rotatably arranged on the cage. One end of the rotating annular gap is sequentially blocked by a base surface seal and a magnetic back pressure cover from inside to outside. The outer end surface of the magnetic back pressure cover presses against the end surfaces of the inner ring and the outer ring. The other end of the rotating annular gap is blocked by a non-base surface seal. The non-base surface seal has a blocking portion and a sleeve body. The blocking portion is placed inside the port of the rotating annular gap. The sleeve body extends out of the port of the rotating annular gap and wraps a part of the outer wall of the outer ring. A retaining edge is formed by turning the edge of the sleeve body outwards.

[0008] In the above-mentioned optimally matched hub unit, the plugging portion includes an annular sheet body, and a number of plugging sheets are arranged in parallel on the annular sheet body. A plugging angle is formed between the plugging sheet and the annular sheet body, and the plugging angle is an acute angle.

[0009] In the above-mentioned optimally matched hub unit, one side surface of the annular sheet body adheres to the end surface of the outer ring, the outer ring of the annular sheet body is connected to the sleeve body through an arc corner, and the end of the plugging sheet abuts against the step surface of the mandrel to form a seal.

[0010] In the above-mentioned optimally matched hub unit, the rotating annular gap is a bent annular channel. A first raceway is inclined inwardly on the outer circumference of the inner ring, and a first retaining edge is arranged along the two side circles of the first raceway. A first rolling surface is correspondingly arranged on the inner wall of the outer ring. The first raceway, the first rolling surface and the circumferential wall of the rolling element form rolling friction, and the first retaining edge and the end surface of the rolling element form rotational friction; A second raceway is inclined inwardly on the outer circumference of the mandrel, and a second retaining edge is arranged along the two side circles of the second raceway. A second rolling surface is correspondingly arranged on the inner wall of the outer ring. The second raceway, the second rolling surface and the circumferential wall of the rolling element form rolling friction, and the second retaining edge and the end surface of the rolling element form rotational friction.

[0011] In the above-mentioned optimally matched hub unit, a bent arc corner is arranged between the first retaining edge and the first raceway, and a gap is left between the bent arc corner and the edge of the end surface of the rolling element; A bent arc corner is arranged between the second retaining edge and the second raceway, and a gap is left between the bent arc corner and the edge of the end surface of the rolling element.

[0012] In the above-mentioned optimally matched hub unit, two cage members are symmetrically arranged in the bent annular channel. One row of rolling elements is arranged on each cage member, and a gap is arranged between the two cage members.

[0013] In the above-mentioned optimally matched hub unit, a flange is convexly provided on the outer circumference of the mandrel, a number of mounting holes are opened on the flange, and bolts are press-fitted into the mounting holes.

[0014] In the above-mentioned optimally matched hub unit, the mandrel has a central through hole, an internal spline is arranged on the inner wall of the central through hole, and a guiding diameter is provided at the front end of the internal spline.

[0015] In the above-mentioned optimally matched hub unit, a counterbore is arranged on one side of the central through hole facing the base surface.

[0016] Compared with the prior art, the optimally matched hub unit of the present invention has the following beneficial effects:

[0017] 1. A base surface seal is press-fitted onto the inner diameter of the outer ring, and a non-base surface seal is press-fitted onto the outer diameter of the outer ring. The effective sealing of both ends of the rotating annular gap is achieved through the cooperation of the two. Further, through the special design of the multi-directional bending of the non-base surface seal and the multi-lip design of the cooperation between the non-base surface seal and the mandrel, the erosion of muddy water is effectively blocked, and the leakage of grease and the entry of external impurities are prevented, improving the sealing performance. At the same time, the retaining edge increases the edge thickness of the sleeve body and forms a right-angle structure, effectively increasing the strength and improving the pre-tightening force of the sleeve body edge fitting the outer wall surface of the outer ring, enhancing the sealing effect.

[0018] 2. The rolling surface of the outer ring, the raceway of the mandrel, the raceway of the inner ring, and the rib of the inner ring increase the effective contact area with the rolling elements, improve the load capacity, and extend the service life of the hub bearing unit.

[0019] 3. Heat treatment processes are adopted for all contact parts to increase the hardness, improve the overall mechanical properties, increase the surface roughness of the contact surface, and reduce the amount of fitting deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of an optimized-fitting hub unit.

[0021] Figure 2 It is Figure 1 An enlarged schematic diagram of part II of

[0022] In the figure, 1. Mandrel; 2. Non-base surface seal; 2a. Sleeve body; 2b. Retaining edge; 2c. Annular sheet; 2d. Plugging sheet; 3. Rolling element; 4. Outer ring; 5. Cage; 6. Base surface seal; 7. Magnetic counter-pressure cover; 8. Inner ring; 9. Bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following are specific embodiments of the present invention in combination with the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0024] Such as Figure 1 and 2As shown in the figure, the hub unit with the optimized cooperation includes a mandrel 1. An inner ring 8 is fixedly sleeved on the outer periphery of the mandrel 1. The inner ring 8 is press-fitted on the mandrel 1, and the product end play is fixed and adjusted by the crimping of the mandrel 1, enabling the product to be quickly replaced modularly and reducing the replacement difficulty. The mandrel 1 completes the crimping during the assembly of the product to ensure the rotation accuracy of the product. An outer ring 4 is sleeved on the outer periphery of the inner ring 8 and the mandrel 1. A rotating annular gap is formed between the outer ring 4, the mandrel 1 and the inner ring 8. A cage 5 is arranged in the rotating annular gap. Rolling elements 3 are rotatably arranged on the cage 5. One end of the rotating annular gap is sequentially sealed with a base surface seal 6 and a magnetic back pressure cover 7 from the inside to the outside. The magnetic back pressure cover 7 provides a signal source for the sensor. The outer end face of the magnetic back pressure cover 7 presses against the end faces of the inner ring 8 and the outer ring 4. The other end of the rotating annular gap is sealed with a non-base surface seal 2. The non-base surface seal 2 has a sealing portion and a sleeve body 2a. The sealing portion is placed inside the port of the rotating annular gap, and the sleeve body 2a extends out of the port of the rotating annular gap and wraps around a part of the outer wall of the outer ring 4. A retaining edge 2b is formed by turning the edge of the sleeve body 2a outwards.

[0025] Preferably, the sealing portion includes an annular sheet body 2c. A plurality of sealing sheets 2d are arranged in parallel on the annular sheet body 2c. A sealing angle is formed between the sealing sheet 2d and the annular sheet body 2c. The sealing angle is an acute angle. The sealing sheet 2d is specifically a conical annular sheet body 2c. The number of the sealing sheets 2d is three. The small-diameter ports of the three sealing sheets 2d are evenly spaced along the inner circle edge of the annular sheet body 2c. A sealing angle is formed between the outer wall of the sealing sheet 2d and the annular sheet body 2c.

[0026] The annular sheet body 2c, the sleeve body 2a and the retaining edge 2b form a bending design, effectively blocking the erosion of mud and water. A multi-lip design is adopted in cooperation with the mandrel 1 to improve the sealing performance. At the same time, the retaining edge 2b increases the edge thickness of the sleeve body 2a and forms a right-angle structure, effectively increasing the strength and the pre-tightening force of the sleeve body 2a against the outer wall of the outer ring 4, and enhancing the sealing effect.

[0027] Preferably, one side surface of the annular sheet body 2c is attached to the end face of the outer ring 4. The outer ring 4 edge of the annular sheet body 2c is connected to the sleeve body 2a through an arc corner. The end of the sealing sheet 2d abuts against the step surface of the mandrel 1 to form a seal. The outer ring 4 is tightly attached in a wrapping type through the annular sheet body 2c and the sleeve body 2a, and the mandrel 1 is tightly attached elastically through a plurality of sealing sheets 2d, thereby realizing an effective and stable sealing effect on the port of the rotating annular gap.

[0028] Preferably, the rotating annular gap is a bent annular channel. On the outer circumference of the inner ring 8, a first raceway is inclined inward. The first raceway is hardened integrally to increase its hardness and thus its wear resistance. On both circumferential edges of the first raceway, a first retaining edge is provided. Corresponding to the first retaining edge, a first rolling surface is provided on the inner wall of the outer ring 4. The first rolling surface is hardened locally to increase its hardness and wear resistance. The first raceway, the first rolling surface and the circumferential wall of the rolling element 3 form rolling friction, and the first retaining edge and the end face of the rolling element 3 form rotational friction. On the outer circumference of the core shaft 1, a second raceway is inclined inward. The second raceway is hardened locally to increase its hardness and wear resistance. On both circumferential edges of the second raceway, a second retaining edge is provided. Corresponding to the second retaining edge, a second rolling surface is provided on the inner wall of the outer ring 4. The second rolling surface is hardened locally to increase its hardness and wear resistance. The second raceway, the second rolling surface and the circumferential wall of the rolling element 3 form rolling friction, and the second retaining edge and the end face of the rolling element 3 form rotational friction.

[0029] The bent annular channel is a symmetric structure. Two rows of rolling elements 3 are symmetrically arranged on both sides of the bending point, so that a double-row angular contact bearing structure is formed inside the hub unit. The raceway surface has a certain angle, so that it can bear both axial load and radial load.

[0030] Preferably, a bent arc corner is provided between the first retaining edge and the first raceway, and a gap is left between the bent arc corner and the edge of the end face of the rolling element 3. A bent arc corner is provided between the second retaining edge and the second raceway, and a gap is left between the bent arc corner and the edge of the end face of the rolling element 3.

[0031] An access gap is formed between the raceway and the retaining edge through the bent arc corner, so as to avoid frictional damage to the edge of the end face of the rolling element 3, prevent the rolling element 3 from deforming, ensure the concentricity of the hub rotation, and extend the service life of the rolling element 3. The first retaining edge and the second retaining edge are super-finished to improve their accuracy and surface roughness.

[0032] Preferably, two cages 5 are symmetrically arranged inside the bent annular channel. One row of rolling elements 3 is arranged on each cage 5, and a gap is provided between the two cages 5.

[0033] Preferably, a flange is convexly provided on the outer periphery of the core shaft 1. A plurality of mounting holes are opened on the flange, and bolts 9 are press-fitted into the mounting holes. The hub unit is connected to the brake disc and the hub through a plurality of bolts 9.

[0034] Preferably, the core shaft 1 has a central through hole. Internal splines are provided on the inner wall of the central through hole, and a guiding diameter is provided at the front end of the internal splines. During assembly, the internal splines cooperate with the external splines to fix the hub bearing unit on the vehicle chassis and ensure the torque transmission of the hub unit.

[0035] Preferably, a counterbore is provided on one side of the central through hole facing the base surface. The weight of the hub bearing is reduced through the counterbore, effectively reducing the unsprung weight and improving the vehicle handling performance.

[0036] The effect of the optimized and coordinated hub unit is as follows: after the outer ring 4 is press-fitted with the non-base surface seal 2, an external mud guide groove is formed, and the muddy water flows out before flowing into the lip where the non-base surface seal 2 contacts the mandrel 1, reducing the erosion of the muddy water on the seal.

[0037] The design of the hub unit bearing also has a very important impact on the bearing life. For example, by appropriately increasing the diameter of the rolling element 3, the fatigue life of the rolling bearing largely depends on the maximum load of the rolling element 3. Increasing the diameter of the rolling element 3 can enhance the load-bearing capacity of the rolling element 3 and improve the bearing life. Reasonably setting the contact parameters between the rolling element 3 and the raceway has an obvious effect on the life of the hub unit bearing.

[0038] 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 may 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 scope defined by the appended claims.

[0039] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 components. 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 hub unit with optimized fit, comprising a core shaft, the core shaft outer circumference is fixedly sleeved with an inner ring, the core shaft and the outer circumference of the inner ring are sleeved with an outer ring, a rotating annular gap is formed between the outer ring and the core shaft and the inner ring, a retaining frame is arranged in the rotating annular gap, and a rolling body is rotatably arranged on the retaining frame, characterized in that: One end of the rotating annular gap is blocked with a base surface seal and a magnetic back pressure cover in sequence from the inside to the outside, and the outer end face of the magnetic back pressure cover is pressed against the inner ring end face and the outer ring end face; the other end of the rotating annular gap is blocked with a non-base surface seal, and the non-base surface seal has a sealing portion and a sleeve body, the sealing portion is placed in the rotating annular gap port, the sleeve body extends out of the rotating annular gap port and wraps around a portion of the outer wall of the outer ring, and the edge of the sleeve body is folded outward to form a retaining edge.

2. The optimally matched hub unit according to claim 1, characterized in that: The blocking portion comprises an annular sheet body, on which a plurality of blocking sheets are arranged in parallel, and a blocking angle is formed between the blocking sheets and the annular sheet body, and the blocking angle is an acute angle.

3. The optimally matched hub unit according to claim 2, characterized in that: One side surface of the annular sheet body is attached to the end surface of the outer ring, the outer ring of the annular sheet body is connected to the sleeve body through an arc corner, and the end of the blocking sheet abuts against the step surface of the core shaft to form a seal.

4. The optimally matched hub unit according to claim 1, characterized in that: The rotating annular gap is a bent annular channel, and a raceway 1 is arranged on the outer circumference of the inner ring in an inwardly inclined manner, and ribs 1 are arranged on both side edges of the raceway 1, and a rolling surface 1 is arranged correspondingly on the inner wall of the outer ring. The raceway 1 and the rolling surface 1 form rolling friction with the circumferential wall of the rolling body, and the rib 1 forms rotational friction with the end face of the rolling body; a raceway 2 is arranged on the outer circumference of the core shaft in an inwardly inclined manner, and ribs 2 are arranged on both side edges of the raceway 2, and a rolling surface 2 is arranged correspondingly on the inner wall of the outer ring. The raceway 2 and the rolling surface 2 form rolling friction with the circumferential wall of the rolling body, and the rib 2 forms rotational friction with the end face of the rolling body.

5. The optimally matched hub unit according to claim 4, characterized in that: An arc corner is set between the first retaining edge and the first raceway, and a gap is left between the arc corner and the end surface edge of the rolling body; an arc corner is set between the second retaining edge and the second raceway, and a gap is left between the arc corner and the end surface edge of the rolling body.

6. The optimally matched hub unit according to claim 4, characterized in that: Two retaining frames are symmetrically arranged in the bent annular channel, a row of rolling elements is arranged on each retaining frame, and a gap is arranged between the two retaining frames.

7. The optimally matched hub unit according to claim 1, characterized in that: A flange is protruded from the outer periphery of the core shaft, a plurality of mounting holes are opened on the flange, and bolts are press-fitted into the mounting holes.

8. The optimally matched hub unit according to claim 1, characterized in that: The core shaft has a central through hole, an inner spline is arranged on the inner wall of the central through hole, and a guide diameter is arranged at the front end of the inner spline.

9. The optimally matched hub unit according to claim 8, characterized in that: A sink hole is arranged on one side of the central through hole facing the base surface.

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