Hub unit

Abstract

The utility model relates to the technical field of hubs, in particular to a hub unit which comprises a hub inner ring and a hub outer ring, a threaded hole used for being connected with a flange plate is formed in the connecting end of the hub outer ring, and the hub inner ring comprises a first inner ring body, a second inner ring body and a clamping ring used for connecting the first inner ring body with the second inner ring body. A first roller is arranged between the first inner ring and the hub outer ring, a second roller is arranged between the second inner ring and the hub outer ring, a first bearing is formed among the first inner ring, the first roller and the hub outer ring, and a second bearing is formed among the second inner ring, the second roller and the hub outer ring; positioning grooves for positioning the first roller and the second roller are respectively formed in the first inner ring and the second inner ring; the second rollers are located at the connecting end of the hub outer ring, the distance between the first rollers and the axis of the hub outer ring is larger than the distance between the second rollers and the axis of the hub outer ring, and the size and number of the first rollers are larger than those of the second rollers.

Description

Technical Field

[0001] This application relates to the technical field of wheel hubs, and particularly to a wheel hub unit. Background Technology

[0002] Existing wheel hub units typically have two sets of bearings, located between the inner and outer rings of the hub unit, at both ends. During installation, the two sets of bearings are installed at each end of the hub unit.

[0003] The hub unit with the above-described structure may experience bearing detachment after prolonged use due to the axial force generated during operation. Furthermore, since the forces on both sides of the hub unit are typically different during use, the bearing experiencing greater force is more prone to detachment, and the two bearings may have different lifespans, resulting in a reduced overall lifespan. Utility Model Content

[0004] To address the issues of bearing detachment and reduced lifespan due to uneven stress on the two bearings, this application provides a hub unit.

[0005] This application provides a hub unit that adopts the following technical solution:

[0006] A wheel hub unit includes an inner wheel hub ring and an outer wheel hub ring. The connecting end of the outer wheel hub ring is provided with a threaded hole for connecting with a flange. The inner wheel hub ring includes a first inner ring, a second inner ring, and a retaining ring for connecting the first inner ring and the second inner ring. A first roller is provided between the first inner ring and the outer wheel hub ring, and a second roller is provided between the second inner ring and the outer wheel hub ring. A first bearing is formed between the first inner ring, the first roller, and the outer wheel hub ring. A second bearing is formed between the second inner ring, the second roller, and the outer wheel hub ring. A first seal is provided at the open end between the first inner ring and the outer wheel hub ring, and a second seal is provided at the open end between the second inner ring and the outer wheel hub ring. Positioning grooves for positioning the first roller and the second roller are respectively provided on the first inner ring and the second inner ring.

[0007] The second roller is located at the connecting end of the outer ring of the hub. The distance between the first roller and the center line of the outer ring of the hub is greater than the distance between the second roller and the center line of the outer ring of the hub. Furthermore, the size and number of the first roller are both greater than those of the second roller.

[0008] By adopting the above technical solution, the bearing structure is directly formed by the inner and outer rings of the inner and outer rings of the hub, which serve as bearings, and the rollers. This simplifies the overall structure and solves the problem of bearing detachment by using retaining rings to connect the first and second inner rings. Furthermore, by changing the installation position and size of the first and second rollers, the first bearing formed by the first roller has a better load-bearing capacity and improves the overall service life. At the same time, reducing the number of second rollers can reduce costs.

[0009] In one embodiment, the angle between the axis of the first roller and the axis of the outer rim of the hub is greater than the angle between the axis of the second roller and the axis of the outer rim of the hub.

[0010] By adopting the above technical solution, the inclination angle of the first roller is increased, and the axial force acting on the first inner ring is reduced, thereby further improving the service life of the first bearing, which is the main load-bearing bearing.

[0011] In one embodiment: the inner sides of the first inner ring and the second inner ring are provided with snap-fit ​​grooves, and the snap ring is provided with two snap-fit ​​protrusions that cooperate with the snap-fit ​​grooves.

[0012] By adopting the above technical solution, the connection via a snap-fit ​​method is relatively convenient.

[0013] In one embodiment, a sealing ring is provided on the outer side of the first inner ring and the second inner ring, and the sealing ring is located at the abutment of the first inner ring and the second inner ring.

[0014] By adopting the above technical solution, a sealing ring is set to enhance the sealing performance at the contact point between the first inner ring and the second inner ring, preventing lubricating oil between the outer ring and the inner ring of the wheel hub from flowing out of the gap.

[0015] In one embodiment: the outer sides of the first inner ring and the second inner ring are spliced ​​to form a mounting groove, the mounting groove being gradually smaller along the direction away from the axis of the inner ring of the hub; the cross-section of the sealing ring is trapezoidal to match the mounting groove, and the outer dimensions of the sealing ring are larger than the mounting groove.

[0016] By adopting the above technical solution and using the trapezoidal sealing ring design, the sealing ring can be fixed after the first inner ring and the second inner ring come into contact. At the same time, the trapezoidal inclined surface design can compress the sealing ring after the first inner ring and the second inner ring are spliced ​​together, making it easier to form a sealing effect.

[0017] In one embodiment: the sealing ring includes a main body and connecting lips disposed on both sides of the main body, the distance between the connecting lips on both sides being gradually increased to form a trapezoidal structure.

[0018] By adopting the above technical solution and forming a trapezoid through the structure of the connecting lip, material costs can be reduced.

[0019] In one embodiment: the ends of the two connecting lips are provided with inwardly folded sealing lips, and the two sealing lips are arranged opposite to each other.

[0020] By adopting the above technical solution, the sealing lip can abut against the bottom of the mounting groove to form a second seal, thereby improving the sealing effect.

[0021] In one embodiment, a support frame is also embedded inside the sealing ring.

[0022] By adopting the above technical solution, the support frame setting can improve the structural strength of the sealing ring.

[0023] In one embodiment: the support frame includes a connecting portion located in the main body and support portions located on two connecting lips, with the two support portions located on both sides of the connecting portion.

[0024] By adopting the above technical solution, the support part can support the connecting lip, improve the elastic stiffness of the connecting lip, and enable it to form greater pressure with the side wall of the mounting groove.

[0025] In one embodiment, the distance between the end of the support and the center line of the inner ring of the hub is less than the distance between the opening edge of the mounting groove near the support and the center line of the inner ring of the hub.

[0026] By adopting the above technical solution, on the one hand, the elastic stiffness of part of the connecting lip can be maximized, so that the sealing lip and the side wall of the mounting groove can form a seal through extrusion deformation, while the other part of the seal without support can form a seal through overall deformation and bending; on the other hand, it can better keep the sealing ring in the mounting groove, and avoid excessive deformation of the sealing lip at one time, which would cause it to fold inward and lose the sealing effect. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of Embodiment 1;

[0028] Figure 2 This is a schematic diagram of the structure of Embodiment 2;

[0029] Figure 3 yes Figure 2 Enlarged view of part A.

[0030] In the diagram, 100 is the inner ring of the hub; 110 is the threaded hole; 200 is the first inner ring; 210 is the positioning groove; 220 is the mounting groove; 300 is the second inner ring; 310 is the snap-fit ​​groove; 400 is the retaining ring; 410 is the snap-fit ​​protrusion; 710 is the first seal; 720 is the second seal; 800 is the sealing ring; 810 is the main body; 820 is the connecting lip; 830 is the sealing lip; 900 is the support frame; 910 is the connecting part; and 920 is the support part. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the accompanying drawings.

[0032] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0033] Example 1: A hub unit, such as Figure 1 As shown, it includes an inner hub ring 100 and an outer hub ring. The connecting end of the outer hub ring is provided with a threaded hole 110 for connecting with a flange. The threaded holes 110 are evenly distributed along the axis of the outer hub ring.

[0034] The inner ring 100 of the wheel hub includes a first inner ring 200, a second inner ring 300, and a retaining ring 400 for connecting the first inner ring 200 and the second inner ring 300. A first roller and a first cage are provided between the first inner ring 200 and the outer ring of the wheel hub, and a second roller and a second cage are provided between the second inner ring 300 and the outer ring of the wheel hub. A first bearing is formed between the first inner ring 200, the first roller, and the outer ring of the wheel hub, and a second bearing is formed between the second inner ring 300, the second roller, and the outer ring of the wheel hub.

[0035] The first inner ring 200 and the second inner ring 300 are respectively provided with positioning grooves 210 for positioning the first roller and the second roller. During installation, the first roller and the first cage are first installed in the positioning groove 210 of the first inner ring 200, and the second roller and the second cage are installed in the positioning groove 210 of the second inner ring 300. Then, the first inner ring 200 and the second inner ring 300 are installed axially to both ends of the outer ring of the hub. The installation is completed after being connected by the retaining ring 400.

[0036] The inner wall of the outer rim of the wheel hub is provided with an inclined surface for abutting against the first roller and the second roller.

[0037] A first seal 710 is provided at the opening between the first inner ring 200 and the outer ring of the hub, and a second seal 720 is provided at the opening between the second inner ring 300 and the outer ring of the hub.

[0038] The second roller is located at the connecting end of the outer rim of the hub. The distance d between the centerline of the first roller and the outer rim of the hub is greater than the distance c between the centerline of the second roller and the outer rim of the hub. Furthermore, the size and number of the first roller are both greater than those of the second roller. In this embodiment, the size includes the diameter and length of the roller; that is, the diameter and length of the first roller are both greater than those of the second roller. At the same time, the size difference between the two rollers must also consider the quantity; the number of rollers cannot be less than the number of rollers due to the first roller being too large. Otherwise, the size difference between the first and second rollers will be too large, affecting the overall lifespan due to the second roller.

[0039] The angle b between the axis of the first roller and the axis of the outer rim of the hub is greater than the angle a between the axis of the second roller and the axis of the outer rim of the hub.

[0040] The inner sides of the first inner ring 200 and the second inner ring 300 are provided with a snap-fit ​​groove 310, and the snap ring 400 is provided with two snap-fit ​​protrusions 410 that cooperate with the snap-fit ​​groove 310.

[0041] Example 2: Figure 2 As shown, the difference from Embodiment 1 is that a sealing ring 800 is provided on the outer side of the first inner ring 200 and the second inner ring 300, and the sealing ring 800 is located at the abutment of the first inner ring 200 and the second inner ring 300. By providing the sealing ring 800, the sealing performance at the abutment of the first inner ring 200 and the second inner ring 300 is enhanced, preventing lubricating oil between the outer ring of the wheel hub and the inner ring of the wheel hub 100 from flowing out from the gap.

[0042] The outer sides of the first inner ring 200 and the second inner ring 300 are spliced ​​together to form a mounting groove 220. The opening of the mounting groove 220 gradually decreases along the direction away from the axis of the inner ring 100 of the hub. Preferably, the bottom of the mounting groove 220 is designed to be high in the middle and low on both sides, so that the middle of the mounting groove 220 presents a raised structure. The raised shape can be straight or curved.

[0043] The cross-section of the sealing ring 800 is trapezoidal and matches the mounting groove 220. The outer dimensions of the sealing ring 800 are larger than those of the mounting groove 220, so that after the first inner ring 200 and the second inner ring 300 are abutted, they can exert force and squeeze the sealing ring 800 from both sides.

[0044] Specifically, the sealing ring 800 includes a main body 810 and connecting lips 820 on both sides of the main body 810. The distance between the connecting lips 820 on both sides is gradually increased to form a trapezoidal structure.

[0045] The ends of the two connecting lips 820 are provided with inwardly folded sealing lips 830, and the two sealing lips 830 are arranged opposite each other. The sealing lips 830 can abut against the bottom of the mounting groove 220 to form a second seal, thereby improving the sealing effect.

[0046] A support frame 900 is embedded inside the sealing ring 800. The support frame 900 includes a connecting portion 910 located on the main body 810 and support portions 920 located on both sides of the connecting portion 910. The support portions 920 can support the connecting lips 820, improve the elastic stiffness of the connecting lips 820, and enable them to form greater pressure with the side wall of the mounting groove 220.

[0047] The distance between the end of the support portion 920 and the centerline of the inner ring 100 of the hub is less than the distance between the edge of the opening of the mounting groove 220 near the support portion 920 and the centerline of the inner ring 100 of the hub. This arrangement allows the elastic stiffness of the connecting lip 820 to reach its optimal level, enabling the sealing lip 830 to form a seal with the side wall of the mounting groove 220 through compression deformation, while the seal of the other part without the support portion 920 is formed by overall deformation and bending. On the other hand, it also better keeps the sealing ring 800 within the mounting groove 220, preventing the sealing lip 830 from deforming too much at once and folding inward, thus losing its sealing effect.

[0048] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hub unit, comprising an inner hub ring (100) and an outer hub ring, wherein the connecting end of the outer hub ring is provided with a threaded hole (110) for connection with a flange, characterized in that: The inner ring (100) of the wheel hub includes a first inner ring (200), a second inner ring (300), and a retaining ring (400) for connecting the first inner ring (200) and the second inner ring (300). A first roller is provided between the first inner ring (200) and the outer ring of the wheel hub, and a second roller is provided between the second inner ring (300) and the outer ring of the wheel hub. A first bearing is formed between the first inner ring (200), the first roller, and the outer ring of the wheel hub. A second bearing is formed between the second inner ring (300), the second roller, and the outer ring of the wheel hub. A first seal (710) is provided at the open end between the first inner ring (200) and the outer ring of the wheel hub, and a second seal (720) is provided at the open end between the second inner ring (300) and the outer ring of the wheel hub. Positioning grooves (210) for positioning the first roller and the second roller are respectively provided on the first inner ring (200) and the second inner ring (300). The second roller is located at the connecting end of the outer ring of the hub. The distance between the first roller and the center line of the outer ring of the hub is greater than the distance between the second roller and the center line of the outer ring of the hub. Furthermore, the size and number of the first roller are both greater than those of the second roller.

2. The hub unit according to claim 1, characterized in that: The angle between the axis of the first roller and the axis of the outer rim of the hub is greater than the angle between the axis of the second roller and the axis of the outer rim of the hub.

3. The hub unit according to claim 1, characterized in that: The inner sides of the first inner ring (200) and the second inner ring (300) are provided with snap-fit ​​grooves (310), and the snap ring (400) is provided with two snap-fit ​​protrusions (410) that cooperate with the snap-fit ​​grooves (310).

4. The hub unit according to claim 1, characterized in that: A sealing ring (800) is provided on the outer side of the first inner ring (200) and the second inner ring (300), and the sealing ring (800) is located at the abutment of the first inner ring (200) and the second inner ring (300).

5. The hub unit according to claim 4, characterized in that: The outer sides of the first inner ring (200) and the second inner ring (300) are spliced ​​together to form a mounting groove (220). The opening of the mounting groove (220) is gradually reduced along the direction away from the axis of the inner ring (100) of the hub. The cross-section of the sealing ring (800) is trapezoidal and matches the mounting groove (220). The outer dimensions of the sealing ring (800) are larger than those of the mounting groove (220).

6. The hub unit according to claim 5, characterized in that: The sealing ring (800) includes a main body (810) and connecting lips (820) on both sides of the main body (810). The distance between the connecting lips (820) on both sides is gradually increased to form a trapezoidal structure.

7. The hub unit according to claim 6, characterized in that: The ends of the two connecting lips (820) are provided with inwardly folded sealing lips (830), and the two sealing lips (830) are arranged opposite to each other.

8. The hub unit according to claim 6 or 7, characterized in that: The inner side of the sealing ring (800) is also embedded with a support frame (900).

9. The hub unit according to claim 8, characterized in that: The support frame (900) includes a connecting part (910) located on the main body (810) and a support part (920) located on two connecting lips (820), with the two support parts (920) located on both sides of the connecting part (910).

10. The hub unit according to claim 9, characterized in that: The distance between the end of the support (920) and the center line of the inner ring (100) of the hub is less than the distance between the edge of the opening of the mounting groove (220) near the support (920) and the center line of the inner ring (100) of the hub.

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