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Bearing device for wheel

一种轴承装置、车轮的技术，应用在轴承、车轴、车轮等方向，能够解决难轻量化、断裂、耐久性下降等问题，达到质量容易管理的效果

Active Publication Date: 2007-03-14
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in order to reduce the weight of the wheel bearing device, if the wheel mounting flange 104a is made into an arm shape, etc., the durability of the unquenched coarsened microstructure after hot forging will be reduced, and cracks will occur.
As a result, cracks occur, making it difficult to reduce weight

Method used

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  • Bearing device for wheel
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  • Bearing device for wheel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The results of actual studies on the mechanical properties and microstructure will be described below. Table 1 shows the composition of steel materials used in Example 1 of the present invention. The steels in the examples of the present invention are improved on the basis of S53C, and the characteristics of the composition are as follows. The characteristic point in Examples 3 and 4 of the present invention is that V and the like are contained in addition to low Mn.

[0059] (Example 1 of the present invention) S53C corresponds to +V: 0.08% by mass

[0060] (Example 2 of the present invention) S53C corresponds to +Ti0.07% by mass

[0061] (Example 3 of the present invention) Low Mn (0.25% by mass)+V: 0.09% by mass

[0062] (Example 4 of the present invention) Low Mn (0.24 mass%)+V: 0.04 mass%+Ti0.06 mass%

Embodiment 2

[0084] Next, a durability test was performed using the steel used for the manufacture of the hub ring and the outer ring of the wheel bearing device. This test can be called a test for verifying the life of repeated stress from the hub bolt hole eccentric position of the hub rim against the root of the flange or the arm. The steel used as an example of the present invention contains 0.6% by mass of C, 0.57% by mass of Si, 0.8% by mass of Mn, 0.015% by mass of P, 0.017% by mass of S, 0.25% by mass of Cr and 0.15% by mass of V. mass % of steel. As the steel used in the comparative example, commercially available carbon steel S53C for machine structures specified in JIS G4051 was used.

[0085] As shown in FIG. 2 , the steel materials of the above-mentioned examples of the present invention and the steel materials of the comparative example were hot forged to produce cooled test pieces, and neither of them was normalized.

[0086] In the test, the shrinkage workability was eval...

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PUM

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Abstract

A bearing device for a wheel enabling the easy control of quality since there is no possibility of cracking even if caulking is applied thereto. The bearing device comprises an outer ring (3) having double rows of raceway surfaces on the inner periphery thereof, an inner member having raceway surfaces opposed to the raceway surfaces, and balls (1) interposed between the double rows of raceway surfaces opposed to each other. The inner member further comprises a HUB ring (4) and an inner ring (2). Caulking is applied to the HUB ring (4) to join it to the inner ring (2). The grain size number of the austenite grains of a caulked section (4b) is at least 6.

Description

technical field [0001] The present invention relates to a bearing device for a wheel, and more specifically, to a bearing device for a wheel including parts such as a hub ring for tightening in the bearing device for a wheel. Background technique [0002] A hub bearing (HUB) is a wheel support device that rotatably supports a tire (wheel) on a vehicle body. A constant velocity universal joint (CVJ: Constant Velocity Joint) is a torque transmission device that transmits the rotation of the engine to the wheels. These HUBs and CVJs have the following problems in manufacture. [0003] (1) It becomes a stepped shape with high processing rate; [0004] (2) Because of the raceway surface, a part with high hardness is required after induction hardening. Therefore, if steel with high carbon content such as S53C, SAE1050 is used, the deformation resistance during processing becomes high. [0005] From the foregoing, hot forging is widely used because cold forging and warm forging...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C33/64F16C33/62C21D9/40C22C38/00C22C38/14B60B35/18F16C19/18F16C19/38F16C33/60F16C35/063F16C43/04
CPCF16C43/04F16C2326/02B60B27/0042B60B27/0084C21D9/40C22C38/04C21D2211/001B60B27/001F16C35/063F16C19/186B60B27/0094B60B27/0005F16C19/187C22C38/02B60B27/0068F16C33/64C22C38/18F16C19/386
Inventor 平井功田洼孝康吉田和彦
Owner NTN CORP
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