JP2011133056A - Method of manufacturing rolling bearing unit for supporting wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a rolling bearing unit for supporting a wheel in which the deterioration of roundness of outer ring raceway surface at mounting on a knuckle is suppressed. <P>SOLUTION: The rolling bearing unit for supporting a wheel is provided with outer ring flanges which face vehicle center side and have mounting surfaces and a plurality of bolt holes for mounting to a support member of a vehicle body on its outer circumferential part. On its inner circumferential part, the bearing unit has an outer ring which has double-row inner peripheral raceways, an inner ring which has double-row outer peripheral raceways facing the double-row inner peripheral raceways, and rollers which are disposed between the outer and inner rings and enables the outer and inner rings to rotate relatively. In the method of manufacturing the rolling bearing unit, polishing processing is applied to the inner peripheral raceways of the outer ring with the outer ring mounted on the support member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a method of manufacturing a wheel-supporting rolling bearing unit used for an automobile, for example.

Generally, in a rolling bearing unit for supporting a wheel used in an automobile, an inner ring rotates and an outer ring is fixed to a support member on the vehicle body side. As shown in FIG. 2 (e), when the outer ring 1 is attached to the knuckle 2 as a support member, the roundness of the outer ring raceway surface 3 may deteriorate. In FIG. 2 (f), a thick dotted ellipse is exaggerated and schematically showing that the roundness of the outer ring raceway surface 3 has deteriorated for ease of explanation. The reason why the roundness deteriorates is that the flatness of the portion 7 attached to the knuckle 2 of the outer ring flange 4 is not good, the strength of the outer ring flange is insufficient, and the flatness of the outer ring attachment surface 5 of the knuckle 2 is not good. Etc. When the roundness is deteriorated, the preload amount or gap amount of the rolling bearing unit is changed, which may lead to a decrease in life and a decrease in support rigidity. As a prior art for improving this part, there is, for example, Patent Document 1. As shown in FIG. 3, the bolt hole periphery 6 of the outer ring flange 4 is made thicker than the other parts to improve the strength of the flange. Thereby, when the bearing unit is attached to the support member, the accuracy of the attachment surface is prevented from affecting the performance of the bearing. Another prior art for improvement in this field is, for example, Patent Document 2. As shown in FIG. 4, the portion attached to the knuckle of the outer ring flange 4 is a concave cone toward the center. Thus, when the bearing unit is attached to the support member, the accuracy of the attachment surface of the support member does not affect the performance of the bearing.

JP 2006-7820 A JP 2006-7822 A

However, in the rolling bearing unit for supporting a wheel described in Patent Document 1, the outer ring flange can be improved even if the bolt hole periphery 6 of the outer ring flange 4 is made thicker than the other parts and the local strength is improved as shown in FIG. If the overall flatness of the periphery 6 of the plurality of bolt holes is not good, the flange 4 may be deformed to some extent when the outer ring 1 is attached to the knuckle 2. Circularity may deteriorate. Further, in the wheel support rolling bearing unit described in Patent Document 2, it is difficult to predict the inclination angle required for the outer ring flange 4, and the mounting accuracy may not be improved due to the shape of the mating mounting surface and the component rigidity.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a method for manufacturing a wheel-supporting rolling bearing unit that suppresses deterioration of the outer ring raceway surface roundness when attached to a knuckle. There is.

In order to solve the above problems, the present invention has the following configuration. That is, in the method for manufacturing a wheel support rolling bearing unit according to the present invention, an outer ring flange having a mounting surface to a support member of a vehicle body and a plurality of bolt holes for mounting is provided on the outer peripheral portion on the vehicle center side. An outer ring having a double-row inner raceway on the periphery, an inner ring having a double-row outer race facing the double-row inner raceway, and a relative rotation of the outer inner ring interposed between the outer and inner rings. A rolling bearing unit for wheel support having a rolling element,
The inner circumferential track of the outer ring is polished with the outer ring attached to a support member. In addition, the support member in the present invention is the support member or a member having the same shape, strength and accuracy as the support member, so that the amount of elastic deformation of the outer ring raceway surface does not change. It is preferable that the part which becomes an obstacle is deleted.

According to the present invention, when the wheel-supporting rolling bearing unit is attached to the vehicle support member, it is possible to suppress the deterioration of the roundness of the inner circumferential track of the outer ring.

It is the figure which represented typically an example of the manufacturing method of the rolling bearing unit for wheel support which concerns on this invention. It is a schematic diagram in which the roundness of the inner circumference track of the outer ring is deteriorated by being attached to the support member. It is the figure which made the bolt hole periphery of the conventional outer ring flange thicker than the other part. It is the figure which made the part attached to the support member of the conventional outer ring | wheel flange the concave cone toward the center part.

An embodiment of a method for manufacturing a wheel bearing rolling bearing unit according to the present invention will be described with reference to the drawings. In FIG. 2 (e), the wheel support rolling bearing unit according to the present invention has an outer ring flange 4 having a mounting surface to the support member of the vehicle body and a plurality of bolt holes for mounting on the outer peripheral portion toward the center of the vehicle. An outer ring 1 having a double-row inner circumferential track 3, an inner ring 10 having a double-row outer race facing the double-row inner circumferential track, and an outer inner ring interposed between the outer and inner rings. Rolling elements 9 that enable relative rotation. In FIG. 2, the rolling elements 9 are rollers, but may be balls. 2 is two, and one of the inner rings 10 of FIG. 2 may have a wheel support flange. Further, the inner surface of the other inner ring may be fitted to the outer surface of one of the inner rings 10 in FIG. 2, and the other inner ring may be fixed by caulking.

FIG. 1 is a diagram schematically showing an example of a method for manufacturing a wheel bearing rolling bearing unit according to the present invention. FIG. 1A is a cross-sectional view of a state in which a bolt 8 is attached to a knuckle 2 that is a support member of an outer ring 1 of a wheel bearing rolling bearing unit. It is preferable that the knuckle 2 is removed before attaching the outer ring 3 to the extent that the amount of elastic deformation of the outer ring raceway surface 3 does not change. Further, instead of the knuckle 2, an alternative member having the same shape and strength as the knuckle 2 may be used. The outer ring 1 is subjected to induction heat treatment on the outer ring raceway surface 3 and tempered. In the case of FIG. 1A, the flange 4 is elastically deformed in the direction of the arrow and the outer ring raceway surface 3 is also slightly elastically deformed due to the influence of the flatness of the portion 7 attached to the knuckle of the outer ring flange. In this way, the outer ring raceway surface 3 is polished while the outer ring 1 is attached to the knuckle 2.

After polishing, the outer ring raceway surface 3 in a state of being attached to the knuckle 2 has a good roundness as schematically shown by a thick dotted circle in FIG. Thereafter, when the outer ring 1 is removed from the knuckle 2, the force applied to the outer ring raceway surface 3 is released, so that the outer ring raceway is schematically represented by a thick dotted oval in FIG. The roundness of the surface is slightly worse. And it wash | cleans and combines with an inner ring | wheel, a rolling element, etc., and it becomes a rolling bearing unit for wheel support. Thereafter, it is assembled to a knuckle 2 or the like that is a support member of a vehicle such as an automobile. At that time, as shown in FIG. 1D, the roundness of the raceway surface 3 of the outer ring 1 is improved to the state shown in FIG. 1B. As described above, the wheel support rolling bearing unit is attached to the vehicle support member by polishing the inner raceway of the outer ring with the outer ring attached to the support member or a member equivalent to the support member. At this time, it is possible to suppress the deterioration of the roundness of the inner raceway of the outer ring.

In addition, this embodiment shows an example of this invention and this invention is not limited to this embodiment. As long as the gist of the present invention is not deviated, the present invention can be applied to other embodiments.

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Knuckle 3 Outer ring raceway surface 4 Outer ring flange 5 Outer ring mounting surface of knuckle 6 Near bolt hole of outer ring flange 7 Part attached to knuckle of outer ring flange 8 Bolt 9 Rolling element 10 Inner ring

Claims (1)

An outer ring flange having a mounting surface to the support member of the vehicle body and a plurality of bolt holes for mounting is provided on the outer peripheral part, and an outer ring having a double row inner peripheral track is provided on the inner peripheral part. In a method of manufacturing a wheel-supporting rolling bearing unit, comprising: an inner ring having a double-row outer circumferential track facing a row of inner circumferential tracks; and a rolling element interposed between the outer and inner rings to enable relative rotation of the outer inner ring. ,
A method of manufacturing a wheel-supporting rolling bearing unit, wherein the outer ring is polished on an inner circumferential track of the outer ring with the outer ring attached to a support member

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