Design method of high rigidity riveted hub bearing unit

Abstract

This invention relates to a design method for a high-rigidity riveted wheel hub bearing unit, belonging to the technical field of wheel hub bearing units. The wheel hub bearing unit structure includes a flange with splined mounting holes. An outer ring is movably fitted onto the flange. An inner ring, nested and riveted to the flange, is located between the rear of the outer ring and the flange. A cage is provided between the front of the outer ring and the flange, and between the inner and outer rings. The cage contains several steel balls movably nested within it, with a contact angle of 35°±3°. This method solves the problem of riveting pressure being transmitted from the flange to the inner ring, causing deformation of the inner ring. It increases the axial preload, which in turn increases the preload force, resulting in higher bearing rigidity. This improves the rigidity of the bearing, increases its impact resistance, and extends its service life.

Description

Technical Field

[0001] This invention relates to the field of wheel hub bearing unit technology, and specifically to a design method for a high-rigidity riveted wheel hub bearing unit. Background Technology

[0002] Wheel hub bearing units are components used in automobile wheel hubs to bear weight and provide precise guidance for the rotation of the wheel hub. They bear both axial and radial loads and are an important part of automobile load-bearing and rotation.

[0003] Traditional design methods treat the inner ring of the bearing and the groove curvature and diameter of the flange as equal, without considering the deformation and impact on the inner ring after assembly and riveting. In practice, after riveting, the inner ring groove curvature becomes smaller and the groove diameter becomes larger, the contact angle of the steel balls becomes smaller, the axial load capacity of the bearing becomes worse, and the axial preload of the bearing cannot be increased. As a result, the bearing cannot meet the design stiffness requirements or higher stiffness requirements. Summary of the Invention

[0004] This invention primarily addresses the shortcomings of existing technologies by providing a design method for a high-rigidity riveted wheel hub bearing unit. It solves the problem of inner ring deformation caused by riveting pressure being transmitted from the flange to the inner ring. By increasing the axial preload, which in turn increases the preload force, the bearing achieves high rigidity. This improves the rigidity of the bearing, enhances its impact resistance, and extends its service life.

[0005] The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions:

[0006] A design method for a high-rigidity riveted wheel hub bearing unit, the wheel hub bearing unit structure including a flange, the flange having splined mounting holes, an outer ring that is movably fitted onto the flange, an inner ring that is nested and riveted between the rear of the outer ring and the flange, a cage being provided between the front of the outer ring and the flange, and between the inner ring and the outer ring, the cage containing a plurality of steel balls that are movably nested and connected to the cage, the contact angle of the steel balls being 35°±3°.

[0007] The design methodology includes the following steps:

[0008] Step 1: Based on the tolerance values ​​of the inner ring di inner diameter and the flange shaft diameter, substitute them into the formula to calculate the expansion amount 'a' of the theoretical design size of the inner ring groove diameter after the inner ring is pressed into the flange shaft diameter. Then subtract the expansion amount 'a' from the theoretical design size of the inner ring groove diameter to obtain the size of the inner ring di groove diameter.

[0009] Step 2: Based on the riveting deformation, the inner ring groove curvature dimension will shrink by 0.01 to 0.03 mm after riveting, and the inner ring Ri groove curvature will increase by 0.02 mm from the theoretical design dimension of the inner ring groove curvature.

[0010] Step 3: When designing the inner ring, the inner ring di groove diameter should be a smaller than the flange groove diameter, and the inner ring Ri groove curvature should be 0.02mm larger than the flange groove curvature.

[0011] Step 4: Inner ring forming. After pressing into the flange and riveting, the inner ring di groove diameter will increase by a, and the inner ring Ri groove curvature will decrease by 0.01~0.03mm, which will cancel out the previous optimization design. At this time, the inner ring groove diameter and groove curvature will return to the theoretical design value and be the same as the groove diameter and groove curvature value of the flange.

[0012] Preferably, the axial clearance of the riveted wheel hub bearing unit is -0.045 to -0.015 mm.

[0013] As a preferred option, a structure for fixing the inner ring with a flange is adopted to achieve an axial riveting force of over 60kN.

[0014] Preferably, a multi-lip skeleton sealing ring is provided between the front end of the outer ring and the flange. The installation of the multi-lip skeleton sealing ring serves as a dust cover and a grease retainer.

[0015] The present invention can achieve the following effects:

[0016] This invention provides a design method for a high-rigidity riveted wheel hub bearing unit. Compared with existing technologies, this design method solves the problem of inner ring deformation caused by riveting pressure being transmitted from the flange to the inner ring. It increases the axial preload, which in turn increases the preload force, thus achieving high bearing rigidity. This improves the rigidity of the bearing, enhances its impact resistance, and extends its service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 This is a cross-sectional view of the inner ring of the present invention.

[0019] Figure 3 This is a schematic diagram of the flange of the present invention.

[0020] In the diagram: Inner ring 1, Outer ring 2, Steel ball 3, Multi-lip skeleton seal ring 4, Flange 5, Spline assembly hole 6, Cage 7, Inner ring Ri groove curvature 8, Inner ring di groove diameter 9, Inner ring di inner diameter 10, Flange groove diameter 11, Flange groove curvature 12, Flange shaft diameter 13. Detailed Implementation

[0021] The technical solution of the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0022] Example: Figure 1 , Figure 2 and Figure 3 As shown, a design method for a high-rigidity riveted wheel hub bearing unit is disclosed. The wheel hub bearing unit structure includes a flange 5, with splined mounting holes 6 inside the flange 5. An outer ring 2 is provided on the flange 5 and is movably fitted with it. An inner ring 1 is provided between the rear of the outer ring 2 and the flange 5, and is nested and riveted with the flange 5 for positioning. A cage 7 is provided between the front of the outer ring 2 and the flange 5, and between the inner ring 1 and the outer ring 2. The cage 7 contains six steel balls 3 that are movably nested with the cage 7, and the contact angle of the steel balls 3 is 35°±3°. A multi-lip skeleton seal ring 4 is provided between the front end of the outer ring 2 and the flange 5. The installation of the multi-lip skeleton seal ring 4 serves as a dust cover and retains grease.

[0023] The design methodology includes the following steps:

[0024] Step 1: Based on the tolerance values ​​of the inner ring di inner diameter 10 and the flange shaft diameter 13, substitute them into the formula to calculate the expansion amount 'a' of the inner ring 1's theoretical design size of the inner ring groove diameter after pressing into the flange shaft diameter 13. Then subtract this expansion amount 'a' from the theoretical design size of the inner ring groove diameter to obtain the size of the inner ring di groove diameter 9.

[0025] Step 2: Based on the riveting deformation, the inner ring groove curvature dimension will shrink by 0.01 to 0.03 mm after riveting, and the inner ring Ri groove curvature 8 will increase by 0.02 mm from the theoretical design dimension of the inner ring groove curvature.

[0026] Step 3: When designing the inner ring 1, the inner ring di groove diameter 9 is designed to be a smaller than the flange groove diameter 11, and the inner ring Ri groove curvature 8 is designed to be 0.02mm larger than the flange groove curvature 12.

[0027] Step 4: Inner ring 1 is formed and fixed using flange 5, achieving an axial riveting force of over 60kN. After pressing in the flange and riveting, the inner ring groove diameter 9 will increase by 'a', and the inner ring groove curvature 8 will decrease by 0.01–0.03mm, offsetting the previous optimization design. At this point, the inner ring groove diameter and curvature will return to their theoretical design values ​​and be identical to the flange groove diameter and curvature values. The axial clearance of the riveted wheel hub bearing unit is -0.045 to -0.015mm.

[0028] In summary, the design method of this high-rigidity riveted hub bearing unit solves the problem of inner ring deformation caused by the transmission of riveting pressure from the flange to the inner ring. Increasing the axial preload, which in turn increases the preload force, results in higher bearing rigidity. This improves the rigidity of the bearing, enhances its impact resistance, and extends its service life.

[0029] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A design method for a high-rigidity riveted wheel hub bearing unit, characterized in that: The hub bearing unit structure includes a flange (5), which has a spline mounting hole (6) inside. The flange (5) has an outer ring (2) that is movably connected to the flange (5). The outer ring (2) is provided with an inner ring (1) that is nested and riveted to limit the flange (5) between the rear of the outer ring (2) and the flange (5). The outer ring (2) is provided with a cage (7) between the front of the outer ring (2) and the flange (5), and between the inner ring (1) and the outer ring (2). The cage (7) contains a number of steel balls (3) that are movably nested and connected to the cage (7). The contact angle of the steel balls (3) is 35°±3°. The design methodology includes the following steps: Step 1: Based on the tolerance values ​​of the inner ring di inner diameter (10) and the flange shaft diameter (13), substitute them into the formula to calculate the expansion amount a of the inner ring (1) after the flange shaft diameter (13) is pressed in. Then subtract the expansion amount a from the inner ring groove diameter theoretical design size to obtain the size of the inner ring di groove diameter (9). Step 2: Based on the riveting deformation, the inner ring groove curvature size will shrink by 0.01 to 0.03 mm after riveting, and the inner ring Ri groove curvature (8) will increase by 0.02 mm on the theoretical design size of the inner ring groove curvature. Step 3: When designing the inner ring (1), the inner ring di groove diameter (9) is designed to be a smaller than the flange groove diameter (11), and the inner ring Ri groove curvature (8) is designed to be 0.02mm larger than the flange groove curvature (12). Step 4: Inner ring (1) forming. After pressing into the flange and riveting, the inner ring di groove diameter (9) will increase by a, and the inner ring Ri groove curvature (8) will decrease by 0.01~0.03mm, which cancels out the previous optimization design. At this time, the inner ring groove diameter and groove curvature will return to the theoretical design value and be the same as the groove diameter and groove curvature value of the flange.

2. The design method for the high-rigidity riveted wheel hub bearing unit according to claim 1, characterized in that: The axial clearance of the riveted wheel hub bearing unit is -0.045 to -0.015 mm.

3. The design method for the high-rigidity riveted wheel hub bearing unit according to claim 1, characterized in that: The inner ring (1) is fixed by riveting with a flange (5), so that the axial riveting force can reach more than 60kN.

4. The design method of the high-rigidity riveted wheel hub bearing unit according to claim 1, characterized in that: A multi-lip skeleton sealing ring (4) is provided between the front end of the outer ring (2) and the flange (5). The installation of the multi-lip skeleton sealing ring (4) serves as a dust cover and a grease preserver.

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