Hub unit

Abstract

The utility model discloses a hub unit which comprises a half shaft, a hub bearing and a bearing, the half shaft comprises an extending part and a base connected with the extending part, and an axial spline is arranged on the periphery of the extending part and inserted into a middle shaft through hole of the hub bearing so as to be clamped with a wall face key groove of the middle shaft through hole; an annular ball groove is formed in the base, the bearing comprises a bearing outer ring, a retainer and a ball, the ball is arranged on the retainer, the outer side of the ball is in contact with the bearing outer ring, and the inner side of the ball is in contact with the ball groove in the base. According to the hub unit, the ball groove is formed in the base, so that the bearing can be well connected with the half shaft without an inner ring structure, meanwhile, the contact area of the balls and the half shaft is increased, the bearing keeps a good acting effect, the stress effect is reduced, the service life of the bearing is prolonged, and in addition, on the premise that the outer diameter of the hub unit is not changed, the service life of the hub unit is prolonged. The bearing inner ring is omitted, so that the depth size of the axial spline can be increased, and the torsion transmission effect of the hub unit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a wheel hub unit. Background Art

[0002] The wheel hub unit is used to bear the rigid rotational inertia between the vehicle and the tire. It cooperates with the tire to support the wheel. The wheel hub unit needs to provide precise guidance during the vehicle transmission process, so it needs to bear both axial loads and radial loads. Currently, the wheel hub units mostly transmit torque through axial splines. The torque value that can be transmitted is related to the depth of the splines. Under the condition of large torque transmission, the existing wheel hub unit size has to be enlarged to meet the use. The increase in the size of the wheel hub unit will affect the spatial layout of the entire vehicle, and at the same time affect the production cost and lightweight requirements of the entire vehicle.

[0003] Therefore, how to meet the vehicle's greater torque transmission requirements while avoiding increasing the size of the wheel hub unit is a technical problem that needs to be urgently solved by those skilled in the art. Utility Model Content

[0004] The utility model provides a wheel hub unit to meet the larger torque transmission demand of the vehicle and avoid increasing the size of the wheel hub unit.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The utility model provides a wheel hub unit, comprising a half shaft, a wheel hub bearing and a bearing, wherein the half shaft comprises a protruding portion and a base connected to the protruding portion, wherein the outer periphery of the protruding portion is provided with an axial spline and is inserted into a central shaft through hole of the wheel hub bearing to be clamped with a keyway on the wall of the central shaft through hole;

[0007] An annular ball track is arranged on the base, and the bearing comprises a bearing outer ring, a retaining frame and a ball. The ball is arranged on the retaining frame, and the outer side of the ball contacts the bearing outer ring, and the inner side contacts the ball track on the base.

[0008] Optionally, in the above-mentioned wheel hub unit, the base includes a docking surface, the docking surface is docked with one side of the wheel hub bearing in the axial direction, and the edge of the ball track contacts with the edge of the docking surface.

[0009] Optionally, in the above-mentioned wheel hub unit, the docking surface is docked with the wheel hub bearing through a curved surface area.

[0010] Optionally, in the above hub unit, a region of the hub bearing connected to the bearing in an axial direction thereof is of a single-step stepped configuration.

[0011] Optionally, in the above wheel hub unit, the inner side of one row of balls contacts only the ball track, and the inner side of another row of balls contacts only the wheel hub bearing.

[0012] The utility model provides a wheel hub unit, comprising a half shaft, a wheel hub bearing and a bearing, wherein the half shaft comprises a protruding portion and a base which is in contact with and fixedly connected to the protruding portion, the protruding portion and the base are both in contact with the wheel hub bearing, and the bearing is sleeved on the outer periphery of the half shaft and the wheel hub bearing;

[0013] The outer periphery of the extension is provided with axial splines, and the extension is inserted into the central axis through hole of the hub bearing; the docking surface of the base docks with one side of the hub bearing in the axial direction, and the docking surface is provided with radial splines and clamped with the keyway on the hub bearing.

[0014] Optionally, in the above hub unit, the radial splines are butted against the axial splines one by one and extend to the edge of the butt surface.

[0015] Optionally, in the above-mentioned hub unit, the half shaft is a stepped shaft configuration, and the protruding portion and the mating surface are respectively located on adjacent two polar steps and are coaxially arranged.

[0016] Optionally, in the above hub unit, the radial splines are evenly arranged along the circumference of the half shaft.

[0017] Optionally, in the above-mentioned wheel hub unit, one side of the extension portion extends out of the center shaft through hole and is locked and connected to the end of the wheel hub bearing through a locking nut.

[0018] It can be seen from the above technical scheme that the hub unit provided by the utility model realizes the effect of smooth assembly of the bearing without the inner ring of the bearing by arranging an independent ball track structure on the half-shaft to directly contact the ball. On the one hand, the base of the half-shaft is relatively large, and its direct contact with the ball can increase the effective area of ​​the ball, so that the bearing maintains a good effect, reduces stress, and extends the service life of the bearing; on the other hand, the inner ring structure of the bearing is cancelled, and design margins can be provided for other structural parts, especially axial splines, on the premise that the overall outer diameter of the hub unit remains unchanged, that is, the key body depth of the axial spline can be increased, thereby improving the connection effect between the axial spline and the hub bearing, so as to achieve the improvement of the torque transmission performance of the entire hub unit during use without increasing the outer diameter of the hub unit, and meet a larger torque transmission working condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, the drawings described below are only some examples or embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work, and the utility model can also be applied to other similar scenarios based on the provided drawings. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0020] Figure 1 It is a schematic diagram of the structure of the hub unit provided by an embodiment of the utility model;

[0021] Figure 2 yes Figure 1 A schematic cross-sectional structure diagram of ;

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of a hub unit in the prior art;

[0023] Figure 4 It is a schematic diagram of the half-shaft structure provided by an embodiment of the utility model;

[0024] Figure 5 It is a schematic diagram of the hub bearing structure provided by an embodiment of the utility model;

[0025] Figure 6 for Figure 5 Back view of

[0026] Figure 7 This is a schematic diagram of the assembly status of the cage and the ball;

[0027] Figure 8 is a schematic diagram of the cage structure;

[0028] Among them, 1-semi-axle; 10-extension part; 101-axial spline; 11-base; 111-joint surface; 112-radial spline; 113-ballway; 2-wheel hub bearing; 20-middle shaft through hole; 30-bearing outer ring; 31-cage; 32-ball; 4-locking nut; 5-bearing oil seal;

[0029] The following is Figure 3 Reference numerals in the hub unit diagram provided in the prior art:

[0030] 60-half shaft; 70-wheel hub bearing; 810-bearing outer ring; 820-bearing inner ring; 830-cage; 840-ball. DETAILED DESCRIPTION

[0031] With the development of vehicle diversity, the transmission requirements of vehicles are becoming more and more complex. For the wheel hub unit, it needs to provide precise guidance during the vehicle transmission process. Therefore, it needs to withstand both axial loads and radial loads. Under the condition of large torque transmission, maintaining the good effect of the wheel hub unit without affecting the production cost and lightweight indicators of the whole vehicle is becoming more and more a research direction for technicians.

[0032] In order to make the technical personnel in this field better understand the present invention, the embodiments of the present invention are described below with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the contents of the utility model described in the claims. In addition, the entire contents of the structures represented by the following embodiments are not limited to those necessary for the solutions of the utility model described in the claims.

[0033] See also Figure 1-8 The wheel hub unit provided by the embodiment of the utility model includes a half-shaft 1, a wheel hub bearing 2 and a bearing, wherein the half-shaft 1 is used for power transmission, and specifically includes an extension portion 10 and a base 11 of an integrated structure. At the same time, the extension portion 10 and the base 11 are both in contact with the wheel hub bearing 2. The contact structure is specifically that a through middle shaft through hole 20 is provided on the wheel hub bearing 2, and the extension portion 10 is inserted into the middle shaft through hole 20 in a close fit. The cross-sectional dimension of the base 11 in the axial direction of the half-shaft 1 is larger than the cross-sectional dimension of the extension portion 10, that is, the cross-sectional dimension of the base 11 is also larger than the cross-sectional dimension of the middle shaft through hole 20, so that the base 11 can dock and contact with the side of the wheel hub bearing 2 where the middle shaft through hole 20 is provided, so as to realize the basic contact between the half-shaft 1 and the wheel hub bearing 2.

[0034] In order to achieve stable connection and torque transmission between the half-shaft 1 and the wheel hub bearing 2, an axial spline 101 is provided on the outer periphery of the extension part 10 on the half-shaft 1, and a keyway is correspondingly provided in the middle shaft through hole 20. When the extension part 10 is inserted into the middle shaft through hole 20, it fits with the inner wall of the middle shaft through hole 20, and at the same time, the axial spline 101 is plugged into the keyway on the wall of the middle shaft through hole 20 one by one, so as to lock the extension part 10 and the wheel hub bearing 2.

[0035] Meanwhile, the bearing specifically includes a bearing outer ring 30, a retainer 31 and a ball 32. The ball 32 is arranged on the retainer 31. The base 11 is also provided with a ball track 113 having an annular structure and taking the axis of the base 11 as the central axis, so as to cooperate with the bearing. Specifically, the outer side of the ball 32 contacts the bearing outer ring 30, and the inner side of the ball 32 contacts the ball track 113 on the base 11, so as to form a bearing structure in which the bearing outer ring 30 and the ball track 113 on the base 11 cooperate to clamp the ball 32. The ball 32 is realized in While reducing the friction between the outer ring 30 of the bearing and the half-shaft 1, the inner side achieves stable contact with the ball track 113. The above structure is achieved by updating the structure of the half-shaft 1, that is, setting the ball track 113 on the base 11 to eliminate the original bearing inner ring of the bearing structure while maintaining the normal function of the bearing and the half-shaft 1; at the same time, the above structural design simplifies the bearing and saves the bearing inner ring, thereby reducing the number of parts of the hub unit, that is, achieving convenient disassembly of the hub unit and reducing the failure rate of the hub unit.

[0036] In addition, it should be noted that an independent ball track 113 structure is provided on the half-shaft 1 to contact the ball 32, and to tighten and surround the ball 32 together with the outer ring 30 of the bearing. Since the base of the half-shaft 1 is larger, the contact area between the ball 32 and the ball track 113 can be increased, so that the bearing maintains a good working effect, reduces stress, and extends the service life of the bearing.

[0037] It should also be noted that in the above structure, the inner ring structure of the bearing is cancelled compared with the prior art, and the outer diameter of the entire wheel hub unit will be reduced accordingly, that is, the update of the bearing structure improves the design freedom of other components inside the wheel hub unit. In a specific embodiment of the utility model, the outer diameter of the wheel hub unit remains unchanged to adapt to the current vehicle design structure, and the design margin generated by the reduction of the inner ring of the bearing is supplemented to the axial spline 101 of the extension part 10, that is, the key body depth of the axial spline 101 is increased, thereby improving its connection effect with the wheel hub bearing 2, thereby improving the torque transmission performance of the entire wheel hub unit during use, and meeting a larger torque transmission working condition.

[0038] The hub unit provided by the embodiment of the utility model realizes the effect of smooth assembly of the bearing without the need for an inner ring of the bearing by arranging an independent ball track 113 structure on the half-shaft 1 so as to make direct contact with the ball 32. On the one hand, the base of the half-shaft 1 is relatively large, and its direct contact with the ball 32 can increase the effective area of ​​the ball 32, so that the bearing maintains a good effect, reduces stress, and extends the service life of the bearing; on the other hand, the inner ring structure of the bearing is cancelled, and design margins can be provided for other structural parts, especially the axial spline 101, on the premise that the overall outer diameter of the hub unit remains unchanged, that is, the key body depth of the axial spline 101 can be increased, thereby improving the connection effect between the axial spline 101 and the hub bearing 2, so as to improve the torque transmission performance of the entire hub unit during use without increasing the outer diameter of the hub unit, and meet a larger torque transmission working condition.

[0039] It should also be noted that in a specific embodiment of the present invention, the axial splines 101 are evenly arranged in the circumferential direction of the protruding portion 10, so that each axial spline 101 is evenly stressed during connection and torque transmission, avoiding the risk of stress concentration. At the same time, the axial splines 101 are completely inserted into the keyway provided on the wall surface of the central axis through hole 20. Here, completely inserted specifically means that the end of the axial spline 101 abuts against the bottom of the keyway provided on the wall surface of the central axis through hole 20, so that the entire area of ​​the axial spline 101 can transmit force.

[0040] In order to further optimize the above technical solution, the base 11 also includes a surface facing the wheel hub bearing 2 and in contact with the wheel hub bearing 2 in the axial direction, hereinafter referred to as the docking surface 111. Preferably, one side edge of the ball track 113 is in contact with the edge of the docking surface 111, so that the contact position of the ball 32 and the half shaft 1 is as close as possible to the setting position of the radial spline 112, thereby reducing the torque transmission distance and making the torque transmission effect better. At the same time, the precise alignment of the ball track 113 and the contact method of the edge also provide additional support for the ball 32, ensuring the smooth operation of the bearing.

[0041] On the basis of the above structure, the area on the docking surface 111 that contacts the wheel hub bearing 2 is an arc surface configuration rather than a planar docking structure in the prior art. The setting of the arc surface area is based on the direct setting of the docking surface 111 and the ball to achieve the arc surface design of other docking areas. Compared with the prior art, the arc surface docking area can not only avoid stress concentration, but also enable the docking surface 111 and the wheel hub bearing 2 to maintain a larger contact area to achieve a better force transmission effect.

[0042] Correspondingly, since the hub unit provided in the embodiment of the utility model has a bearing structure that eliminates the inner ring of the bearing, the hub bearing 2 no longer needs to design a clamping structure for the inner ring of the bearing, so as to meet the assembly requirements. That is, compared with the prior art, in which the hub bearing 2 is provided with a two-stage stepped configuration in the docking area, the hub bearing 2 provided in the embodiment of the utility model only needs to be provided with a single-stage step, and its structure and cost are lower, and the difficulty of assembly is reduced.

[0043] In a specific embodiment of the present invention, in order to improve the operating stability of the bearing, the retaining frame 31 is a symmetrical structure with installation positions on both sides, and the balls 32 are arranged in two rows for cooperation, wherein the inner side of one row of balls 32 contacts the ball track 113 on the base 11, while the inner side of the other row of balls 32 contacts and cooperates with the wheel hub bearing 2. In addition, bearing oil seals 5 are provided on both sides of the bearing to make the bearing have better sealing performance, reduce the risk of pollutants and moisture entering the bearing during operation, and extend the maintenance and replacement cycle of the bearing.

[0044] Furthermore, a wheel hub unit provided in another embodiment of the utility model also includes a half-shaft 1, a wheel hub bearing 2 and a bearing, wherein the bearing can be a bearing structure identical to that of the prior art, or can be a bearing provided in any of the above embodiments without the need for a bearing inner ring structure; in particular, the half-shaft 1 is used for power transmission, and specifically includes an extension portion 10 and a base 11 of an integrated structure, and at the same time, the extension portion 10 and the base 11 are both in contact with the wheel hub bearing 2, and the contact structure is specifically that a through middle shaft through hole 20 is provided on the wheel hub bearing 2, and the extension portion 10 is arranged to be inserted into the middle shaft through hole 20, and the cross-sectional dimension of the base 11 in the axial direction of the half-shaft 1 is larger than the cross-sectional dimension of the extension portion 10, that is, the cross-sectional dimension of the base 11 is also larger than the cross-sectional dimension of the middle shaft through hole 20, so that the base 11 can dock and contact with the side of the wheel hub bearing 2 where the middle shaft through hole 20 is provided, so as to realize basic contact between the half-shaft 1 and the wheel hub bearing 2.

[0045] In order to achieve stable connection and torque transmission between the half-shaft 1 and the wheel hub bearing 2, on the half-shaft 1, an axial spline 101 is provided on the outer periphery of the extension 10, and a keyway is correspondingly provided in the middle shaft through hole 20. When the extension 10 is inserted into the middle shaft through hole 20, it fits with the inner wall of the middle shaft through hole 20; at the same time, a side of the base 11 facing the wheel hub bearing 2 and in contact with the wheel hub bearing 2 in the axial direction, hereinafter referred to as the docking surface 111, is provided with a radial spline 112 to clamp with the keyway on one side of the wheel hub bearing 2 in the axial direction, so as to strengthen the locking of the connection between the extension 10 and the wheel hub bearing 2.

[0046] On the basis of the above structure, the extension 10 is a design structure extending into the center shaft through hole 20, and the connection between the spline and the wheel hub bearing 2 has a connection basis of the radial spline 112. Therefore, the extension 10 can be plugged into the center shaft through hole 20, or it can be only inserted into the center shaft through hole 20 and used as a limiting structure. In a specific embodiment of the utility model, in order to improve the connection effect between the wheel hub bearing 2 and the half shaft 1, the axial spline 101 is plugged into the keyway on the wall of the center shaft through hole 20 one by one to lock the extension 10 and the wheel hub bearing 2.

[0047] It should be noted that the axial splines 101 and the radial splines 112 are preferably arranged in directions close to perpendicular, so that the axial splines 101 and the radial splines 112 can transmit torque from two perpendicular directions, thereby improving the effect of their cooperation.

[0048] At the same time, it should be noted that since the hub unit provided in the embodiment of the utility model adds the setting of the radial spline 112 on the basis of the axial spline 101, so as to transmit torque jointly through the radial spline 112 and the axial spline 101, the corresponding hub unit can transmit a larger torque. Correspondingly, under the condition of the same torque transmission requirement, the use of the hub unit provided in the embodiment of the utility model can reduce the original axial spline 101 and the depth of the newly added radial spline 112, thereby reducing the overall volume of the hub unit, which can not only achieve weight reduction of the whole vehicle, but also meet the demand of the whole vehicle for a small space hub unit, thereby improving the convenience of space layout on the vehicle body.

[0049] The hub unit provided by the embodiment of the utility model has an axial spline 101 arranged on the outer wall of the extension part 10 of the half shaft 1, so that when the extension part 10 is inserted into the central shaft through hole 20 of the hub bearing 2, the axial spline 101 is plugged and locked with the keyway on the wall of the central shaft through hole 20. On this basis, with the help of the docking surface 111 on the base 11 that contacts one side of the hub bearing 2, radial splines 112 are arranged on the docking surface 111, so that when the docking surface 111 contacts the hub bearing 2, the radial spline 112 is inserted into the corresponding keyway to realize the clamping connection between the base 11 and the hub bearing 2. A plurality of axial splines 101 are arranged parallel to each other on the outer periphery of the extension part 10, and a plurality of radial splines 112 are arranged on the docking surface 111. The surface 111 is concentrically and divergently arranged, and the axial splines 101 and the radial splines 112 can transmit torque on two planes, thereby realizing the applicability of the corresponding hub unit to larger torque conditions. At the same time, compared with the prior art, the hub unit provided by the embodiment of the utility model can achieve greater torque transmission without increasing the hub unit under the same hub unit size by virtue of the cooperation of the axial splines 101 and the radial splines 112. Therefore, under the working conditions of the same torque, the size of the hub unit can be lightweight and miniaturized, thereby reducing the weight reduction index of the whole vehicle. At the same time, the reduction in the size of the hub unit can also improve the convenience of space layout on the vehicle body and reduce the difficulty of vehicle design.

[0050] Taking into account that in the hub unit provided in the embodiment of the utility model, the connection stability of the spline is an important basis for torque transmission, therefore, in some specific embodiments of the utility model, the radial splines 112 and the axial splines 101 are connected one by one in the hub unit. The one-to-one connection here specifically refers to that the number of radial splines 112 and axial splines 101 is the same, and each end of the axial spline 101 is connected to a corresponding radial spline 112, so that a pair of radial splines 112 and axial splines 101 form a continuous and bent spline structure to improve the integrity of the splines, thereby enhancing its connection strength, stability and the effect on torque transmission.

[0051] Based on the above embodiment, it is preferred that the first end of the radial spline 112 is connected to the axial spline 101 at one side edge of the mating surface 111, and the second end of the radial spline 112 extends to the other side edge of the mating surface 111, so as to increase the contact area between the radial spline 112 and the keyway when the size permits, thereby improving the load capacity of the entire hub unit.

[0052] In some embodiments of the present invention, the half-shaft 1 in the hub unit adopts a stepped shaft configuration. At the same time, the protruding portion 10 and the mating surface 111 are located on adjacent two polar steps and are coaxially arranged. The half-shaft 1 with a stepped configuration can provide different functions on different steps, such as respectively arranging axial splines 101 and radial splines 112 on different steps while maintaining the overall coaxiality; and it should be noted that the mating surface 111 of the step is preferably perpendicular to the axis of the half-shaft 1, so that the radial spline 112 and the axial spline 101 are in a vertical state and can disperse the torque and stabilize the transmission of force during the torque transmission process.

[0053] In order to ensure the stable connection between the half-shaft 1 and the wheel hub bearing 2 in the axial direction, in some embodiments of the utility model, one side of the protruding portion 10 extends out of the central shaft through hole 20, and is locked and connected to the end of the wheel hub bearing 2 through a locking nut 4, so as to stably connect and limit the half-shaft 1. At the same time, the setting of the locking nut 4 can also facilitate the disassembly of the half-shaft 1 and the wheel hub bearing 2, thereby reducing the difficulty of maintenance of the wheel hub unit.

[0054] Furthermore, a plurality of radial splines 112 are arranged in a discrete manner on the docking surface 111 so as to dock with the hub bearing 2 from various positions and transfer torque. In order to transfer torque more evenly, the radial splines 112 are spaced and evenly arranged along the circumference of the half-shaft 1. This evenly distributed design helps to achieve a more even load distribution around the half-shaft 1, reduce the risk of local stress concentration, and thereby improve the durability and service life of the entire hub unit.

[0055] It should be noted that, for the convenience of description, only the parts related to the utility model are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the utility model can be combined with each other.

[0056] As shown in the utility model and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not specifically refer to the singular, but may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0057] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0058] The above description is only a preferred embodiment of the utility model and an explanation of the technical principles used, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. The scope of the utility model involved in the utility model is not limited to the technical solution formed by a specific combination of the above-mentioned technical features, but also should cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the concept of the above-mentioned utility model. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the utility model (but not limited to) to form a technical solution.

Claims

1. A wheel hub unit, characterized in that: It comprises a half shaft, a wheel hub bearing and a bearing, wherein the half shaft comprises a protruding portion and a base connected to the protruding portion, the outer periphery of the protruding portion is provided with an axial spline and is inserted into the central shaft through hole of the wheel hub bearing to be clamped with the wall keyway of the central shaft through hole, and the bearing is sleeved on the outer periphery of the half shaft and the wheel hub bearing; An annular ball track is arranged on the base, and the bearing comprises a bearing outer ring, a retaining frame and a ball. The ball is arranged on the retaining frame, and the outer side of the ball contacts the bearing outer ring, and the inner side contacts the ball track on the base.

2. The hub unit according to claim 1, characterized in that: The base includes a butt joint surface, which is butt jointed with one side of the hub bearing in the axial direction, and the edge of the ball track contacts with the edge of the butt joint surface.

3. The hub unit according to claim 2, characterized in that: The butt joint surface is butt jointed with the hub bearing via a curved surface area.

4. The hub unit according to claim 1, characterized in that: The hub bearing has a single-step configuration in an area where the hub bearing is connected to the bearing in its axial direction.

5. The hub unit according to claim 1, characterized in that: The inner side of the balls in one row only contacts the ball track, and the inner side of the balls in the other row only contacts the wheel hub bearing.

6. A wheel hub unit, characterized in that: It comprises a half shaft, a wheel hub bearing and a bearing, wherein the half shaft comprises a protruding portion and a base which is in contact with and fixedly connected to the protruding portion, the protruding portion and the base are both in contact with the wheel hub bearing, and the bearing is sleeved on the outer periphery of the half shaft and the wheel hub bearing; The outer periphery of the protruding portion is provided with axial splines, and the protruding portion is inserted into the central axis through hole of the hub bearing; the docking surface of the base is docked with one side of the hub bearing in the axial direction, and the docking surface is provided with radial splines and clamped with the keyway on the hub bearing.

7. The hub unit according to claim 6, characterized in that: The radial splines are butted against the axial splines one by one and extend to the edge of the butt surface.

8. The hub unit according to claim 6, characterized in that: The semi-shaft is of stepped shaft configuration, and the protruding portion and the butt joint surface are respectively located on adjacent two-pole steps and are coaxially arranged.

9. The hub unit according to claim 6, characterized in that: The radial splines are evenly arranged along the circumference of the semi-shaft, and the axial splines are evenly arranged along the circumference of the protruding portion and clamped with the wall keyway of the central shaft through hole.

10. The hub unit according to claim 1 or 6, characterized in that: One side of the protruding portion protrudes out of the middle shaft through hole and is locked and connected to the end of the hub bearing through a locking nut.

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