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Bearing device for wheel

A bearing device and wheel technology, applied in the direction of rotating bearings, bearings, axles, etc., can solve the problems that the optimal stiffness cannot always be obtained, and achieve the effects of increasing stiffness, suppressing damage to balls, and improving noise characteristics

Active Publication Date: 2008-10-29
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art wheel bearing device, since the two rows of bearings in the double row bearing have the same structure, although it has sufficient rigidity during straight road running, it cannot always obtain optimum rigidity during curve driving

Method used

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  • Bearing device for wheel
  • Bearing device for wheel
  • Bearing device for wheel

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no. 1 approach

[0040] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0041] figure 1 It is a longitudinal sectional view showing the first embodiment of the bearing device for a wheel of the present invention, and FIG. 2 is figure 1 Figure 3 is an enlarged sectional view of the situation during the assembly of the inner ball set onto the inner raceway surface of the hub wheel. In the following description, the term "outside" of the device (left-hand side in the figure) refers to the side that is located outside the vehicle body when the bearing device is installed on the vehicle body, and the term "inside" (right-hand side in the figure) of the device Side) refers to the side that is located inside the vehicle body when the bearing unit is installed on the vehicle body.

[0042] figure 1 The bearing arrangement for a wheel of the invention shown is of the third generation type for a driven wheel, comprising an inner...

no. 2 approach

[0059] Figure 4 is a longitudinal sectional view showing a second embodiment of the bearing device for a wheel of the present invention, Figure 5 Yes Figure 4 An enlarged cross-sectional view of the hub wheel, Image 6 is an enlarged cross-sectional view of the situation during the assembly of the inner ball set on the inner raceway surface of the hub wheel, and Fig. 7 is Figure 4 An enlarged sectional view of the outboard bearing row, Figure 8 is Figure 4 An enlarged cross-sectional view of the inboard bearing row of Figure 9 It is an explanatory diagram showing the grinding work performed on the outer parts after heat treatment, Figure 10 (a) is an explanatory diagram showing the grinding operation performed after the heat treatment of the wheel hub, Figure 10 (b) is an explanatory view showing the grinding operation performed on the inner ring after the heat treatment. Since the second embodiment differs from the first embodiment only in the structure of the w...

no. 3 approach

[0070] Figure 11 It is a longitudinal sectional view showing a third embodiment of the bearing device for a wheel of the present invention. The same reference numerals are used here to designate the same components with the same functions as those used in the previous embodiments.

[0071] The bearing arrangement is of the second generation type for driven wheels, comprising an inner part 28 , an outer part 29 and a double row of balls 3 , 3 housed between the inner part 28 and the outer part 29 in a free rolling manner. The inner member 28 includes a pair of inner rings 30, 5 formed with inner raceway surfaces 30a, 5a on their outer peripheral surfaces.

[0072] The outer member 29 is made of medium carbon steel (such as S53C) with a carbon content of 0.40 to 0.80% by weight, and is integrally formed with a wheel mounting flange 6 on its outer peripheral surface, and integrally formed with a double flange on its inner peripheral surface. Outer raceway surfaces 2a, 2b. The...

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Abstract

[problem]To provide a bearing device for a wheel, in which contradictory problems of reduction in weight and size and increased rigidity of the device are simultaneously solved and, in addition, scratches on balls during assembly are prevented from occurring to achieve improvement of acoustic characteristics and the life of the bearing. [MEANS FOR SOLVING THE PROBLEMS] The bearing device for a wheel has a hub wheel (4) integrally having a wheel mounting flange (6) and also having an inner rolling surface (4a) formed on its outer periphery. The pitch circle diameter PCDo of an outer ball (3) group of double-row ball (3, 3) groups is set larger than the pitch circle diameter PCDi of the inner ball (3) group thereof. The diameters of the balls (3) are set equal to each other. The number of the balls of the outer ball (3) group is set larger than the number of the balls of the inner ball (3) group. Corners (A to C) of the outer peripheral surface of the hub wheel (4) are crushed into a smooth circular arc shape. By this construction, occurrences of scratches on the balls during assembly are suppressed to improve acoustic characteristics of the bearing and also the rigidity of the device is enhanced and the life of the bearing is extended.

Description

technical field [0001] The present invention relates to a bearing device for freely rotatably supporting a wheel, and more particularly, to a bearing device for a wheel with increased rigidity and extended life. Background technique [0002] Generally, a bearing device for a wheel is adapted to freely rotatably support a hub wheel for mounting the wheel through a rolling bearing, and adopts inner ring rotation for a driving wheel, and both inner ring rotation and outer ring rotation for a driven wheel. Double row angular contact ball bearings are widely used in such bearing devices because they have desired bearing rigidity, high durability against misalignment, and small torque required for fuel consumption. A double row angular contact ball bearing has a plurality of balls interposed between a stationary ring and a rotating ring, and the balls are in contact with the stationary ring and the rotating ring at a predetermined contact angle. [0003] Bearing devices for wheel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C33/58B60B35/18F16C19/18
Inventor 小森和雄马场一宏
Owner NTN CORP
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