JP4470705B2 - Wheel supporting hub unit, raceway member of wheel supporting hub unit, and manufacturing method thereof - Google Patents

Description

  The present invention relates to a wheel support hub unit for rotatably supporting a wheel of an automobile or the like with respect to a suspension device, a raceway member of the wheel support hub unit, and a method of manufacturing the same.

  A wheel of an automobile or the like is rotatably supported by a wheel support hub unit attached to a vehicle suspension system. In the wheel supporting hub unit, a double-row rolling element is interposed between an inner member having a raceway surface and an outer member so as to be freely rotatable. An attachment flange for attachment to the suspension device of the vehicle body is formed, and a positioning portion for positioning the wheel is provided on the side of the attachment flange.

  By the way, when manufacturing an inner member and an outer member as raceway members, the area of the mounting flange is large, and an enormous forming load is required in cold forging, so forming by hot forging is generally performed. ing. However, in hot forging, the dimensional accuracy is rough, and the heat treatment part may require removal of the decarburized layer, which requires a large cutting allowance in a subsequent process, resulting in an increase in manufacturing cost.

  Therefore, conventionally, as a method of manufacturing the race member, a mounting flange is cut from an intermediate material formed by cold forging using a cylindrical tube as a base material, and the remaining portion after the cutting is determined by a positioning unit. (For example, refer to Patent Document 1), and a positioning part formed separately from the bearing ring member and attached to the bearing ring member (for example, see Patent Documents 2 and 3). ing.

  Further, as a bearing ring member constituting an inner member and an outer member considering weight reduction and strength, a hub ring 6 ′ shown in FIG. 6 and an outer ring 3 shown in FIG. 7 are known. The hub wheel 6 ′ includes a solid shaft portion 5 ′ and a radial wheel mounting flange 7 ′ extending in a direction orthogonal to the shaft portion 5 ′. The wheel mounting flange 7 ′ includes a plurality of mounting portions 21 ′. It is molded into a thick wall, and a webbed thin-walled portion 22 'is formed between the mounting portions 21'. The outer ring 3 includes a hollow shaft portion 15 and a suspension device mounting flange 18 extending in a direction orthogonal to the shaft portion 15, and the suspension device mounting flange 18 has an outer peripheral portion having a different shape.

Conventionally, as shown in FIG. 8, these bearing ring members form a thin portion 22 ′ by expanding a surplus portion between the attachment portions 21 ′ of the wheel attachment flange 7 ′ to the outer peripheral side by hot forging, Thereafter, as shown in FIG. 9, the trimming process is performed to cut the unnecessary portion 23 ′.
JP 2003-25803 A JP 2003-291604 A JP 2004-74815 A

  However, in the above-mentioned Patent Document 1, since bending is performed at the time of cutting the connecting portion between the mounting flange that requires the most strength and the outer peripheral portion of the bearing ring member, defects such as cracks are likely to occur. Since it becomes unstable and it is necessary to make the connecting portion easy to bend, reinforcement such as increasing the thickness of the connecting portion cannot be performed. Further, since the positioning portion does not have a continuous cylindrical shape in the circumferential direction, the positioning becomes unstable and the strength is not sufficient.

  On the other hand, in Patent Document 2 and Patent Document 3, since the positioning portion is separated from the race ring member, the positional accuracy and perpendicularity between the positioning portion and the raceway surface on the race ring member side are likely to decrease, The number of parts increases and the cost increases. Furthermore, since cold forming cannot be performed with a shape including the mounting flange, the cutting cost in the subsequent process is large and the manufacturing cost increases.

  Moreover, since the bearing ring member shown in FIG.6 and FIG.7 is manufactured by hot forging, the problem mentioned above exists. Furthermore, since the thinly crushed portion greatly extends to the outer peripheral side, the surplus is increased and the yield is deteriorated. Further, since the surplus is large, the area of the upsetting portion is increased and the molding load is increased. For this reason, it is particularly disadvantageous to form such an irregularly shaped flange by cold forging where the stress increases.

  The present invention has been made in order to eliminate such inconveniences. The purpose of the present invention is to be able to integrally form the positioning cylinder portion into a cylindrical shape continuous in the circumferential direction and to bend the mounting flange. An object of the present invention is to provide an inexpensive wheel support hub unit that can be formed with low load by cold forging without processing, a raceway member of the wheel support hub unit, and a manufacturing method thereof.

The above object of the present invention is achieved by the following configurations.
(1) A solid or hollow shaft portion, a wheel or vehicle body mounting portion extending radially outward from the shaft portion, the shaft portion on the opposite side of the mounting portion, and the shaft portion A wheel support hub unit bearing wheel member having a wheel or a positioning cylinder part of a vehicle body disposed concentrically with a bearing ring member,
An extrusion step of extruding a head portion having an inner peripheral shape of the shaft portion and the positioning cylinder portion from a solid or hollow shaft portion material;
An upsetting step of forming the mounting portion by mounting the head while leaving the height of the mounting portion using a mold having a hole corresponding to the outer periphery of the positioning cylinder portion;
A method for manufacturing a bearing ring member of a wheel support hub unit, wherein the bearing ring member is formed by cold forging.
(2) After the extruding step, the head is restrained with an irregularly shaped mold and installed, so that the outer peripheral shape of the irregular shape has the same number of radial protrusions as the number of attachment holes provided in the attachment portion An irregular shape molding process for molding the formed head,
Further comprising
The upsetting step forms an attachment portion having an irregularly shaped outer periphery by using the mold to install the head without restraining the outer periphery of the attachment portion, leaving the height of the attachment portion. (1) The manufacturing method of the bearing ring member of the hub unit for wheel support described in (1).
(3) In the extrusion step, the head is simultaneously formed into an outer shape having an irregular shape having the same number of radial protrusions as the number of attachment holes provided in the attachment portion,
The upsetting step forms an attachment portion having an irregularly shaped outer periphery by using the mold to install the head without restraining the outer periphery of the attachment portion, leaving the height of the attachment portion. (1) The manufacturing method of the bearing ring member of the hub unit for wheel support described in (1).
(4) The wheel support according to (2) or (3), further comprising a thin-walled step of thinly placing between the radial protrusions adjacent to each other in the circumferential direction after the upsetting step. For manufacturing bearing ring member of hub unit for automobile.
(5) A solid or hollow shaft portion, a wheel or body attachment portion extending radially outward from the shaft portion, and concentrically disposed on the opposite side of the shaft portion with the attachment portion interposed therebetween. A wheel support member for a wheel-supporting hub unit having a wheel or a positioning cylinder for a vehicle body,
A bearing ring member for a wheel-supporting hub unit manufactured by the manufacturing method according to any one of (1) to (4).
(6) A wheel support hub unit in which an inner member, an outer member, and a bearing portion having at least rolling elements are disposed between the inner member and the outer member,
The wheel support hub unit, wherein at least one of the inner member and the outer member is the race member described in (5).

  According to the present invention, an extrusion process for extruding a head having an inner peripheral shape of a shaft portion and a positioning cylinder portion from a solid or hollow shaft portion material, and a hole corresponding to the outer periphery of the positioning cylinder portion The bearing ring member is formed by cold forging including a mounting step in which the mounting portion is formed by mounting the head using a mold having a height, leaving the height of the mounting portion. During upsetting of the mounting part with high load, it is not necessary to compress the inside of the outer periphery of the positioning cylinder part. Can be molded.

  As a result, it is possible to form the mounting portion using relatively small equipment by cold forging, reduce the machining cost in the subsequent process, and obtain an inexpensive bearing ring member and wheel support hub unit. . In addition, since the connecting portion and the outer peripheral portion of the bearing ring member are not bent, a sufficient thickness can be secured at the connecting portion, and the bearing ring member and the wheel support having sufficient strength can be secured. A hub unit can be obtained.

  In addition, since the inner peripheral side of the mold can be used as a positioning cylinder during upsetting, a cylindrical positioning cylinder that is continuous in the circumferential direction can be easily molded with high precision with the shaft. In addition, since the extra space required for mounting when the positioning cylinder is separated, the material yield can be improved while securing the thickness of the necessary part. This makes it possible to reduce the manufacturing cost.

  Furthermore, by making the outer peripheral shape of the head part before the upsetting process different, the area of the upsetting part during the upsetting process can be reduced and the molding load can be kept low. In addition, when only the thin wall portion is installed with respect to the attachment portion, the molding load can be kept low by reducing the outer periphery after installation, and the trim amount on the outer periphery is reduced, thereby improving the yield. be able to.

  Hereinafter, a raceway member of a wheel support hub unit concerning each embodiment of the present invention, and a manufacturing method for the same are explained in detail with reference to drawings.

(First embodiment)
As shown in FIG. 1, a wheel support hub unit 1 is for a drive wheel, and includes a hub (inner member) 2, an outer ring (outer member) 3 as a race ring member, and a plurality of rolling elements. 4 is provided.

  The hub 2 includes a hub ring 6 including a hollow shaft portion 5 as a race ring member. The hub wheel 6 extends radially outwardly in a direction perpendicular to the shaft portion 5 to an end portion on the outboard side of the outer peripheral surface (an end portion on the outer side in the vehicle width direction in the assembled state in the automobile: the left end portion in FIG. 1). A wheel mounting flange 7 which is an attachment portion is provided, and a stud 8 for mounting a wheel and a brake rotor (not shown) constituting the wheel on the side surface on the outboard side is substantially equal to the circumferential direction in the wheel mounting flange 7. Several are planted at intervals. Each wheel mounting flange 7 is formed with a mounting hole 7a, and each wheel mounting flange 7 is not connected at the pitch circle position of the mounting hole 7a. Further, on the outboard side of the wheel mounting flange 7 of the hub wheel 6, that is, on the side opposite to the shaft portion 5 across the wheel mounting flange 7, a positioning cylinder portion 9 for positioning the wheel is concentric with the shaft portion 5. Projected.

  A small-diameter step portion 10 is formed on the inboard side end portion of the hub wheel 6 (the end portion on the inner side in the vehicle width direction in the assembled state in the automobile: the right end portion in FIG. 1). 11 is fitted. An inner ring raceway surface 12 is formed on the outer peripheral surface of the inner ring 11, and an inner ring raceway surface 13 is formed on the outer peripheral surface in the axial direction of the hub ring 6. The tip of the hub wheel 6 on the inboard side is formed in a cylindrical shape, and the inner ring 11 is crimped and fixed to the hub wheel 6 by spreading the cylindrical part (clamping part) 14 outward in the radial direction. . In addition, the inner ring 11 can be applied with a necessary preload by a nut (not shown) fastened to the end face on the inboard side of the hub wheel 6 in addition to caulking and fixing.

  The outer ring 3 is configured to include a hollow shaft portion 15, and an outer ring corresponding to the inner ring raceway surface 16 of the inner ring 11 and an outer ring raceway surface 16 corresponding to the inner ring raceway surface 13 of the hub ring 6 on the inner peripheral surface of the outer ring 3. A raceway surface 17 is formed, and the suspension device mounting flange 18 which is a mounting portion extending radially outward in a direction perpendicular to the shaft portion 15 is provided at the end of the outer ring 3 on the side away from the wheel mounting flange 7. Are planted. Each suspension device mounting flange 18 is formed with a mounting hole 18a, and each suspension device mounting flange 18 is configured not to be connected at the pitch circle position of these mounting holes 18a. Further, a positioning cylinder portion 19 for positioning the vehicle body is concentric with the shaft portion 15 on the inboard side of the suspension device mounting flange 18 of the outer ring 3, that is, on the opposite side to the shaft portion 15 across the suspension device mounting flange 18. Is formed.

  A plurality of rolling elements 4 are arranged between the double-row inner ring raceway surfaces 12 and 13 and the double-row outer ring raceway surfaces 16 and 17 so as to be able to roll in the circumferential direction via the cage 20. . In the illustrated example, a ball is used as the rolling element 4. However, in the case of a wheel supporting hub unit that is heavy, a tapered roller may be used as the rolling element 4.

  In order to assemble the wheel support hub unit 1 as described above to a vehicle, the suspension device mounting flange 18 of the outer ring 3 is fixed to the suspension device, and the stud 8 or nut ( The brake rotor and the wheel are fixed via a not-shown) or the like. Thereby, a wheel can be rotatably supported with respect to a suspension apparatus.

  Here, a manufacturing method of the hub wheel 6 for driving wheels, which is the raceway member of the wheel supporting hub unit 1, will be described as an example. First, as shown in FIG. 2A, the shaft member 30a shown in FIG. 2B is formed by subjecting the hollow cylindrical shaft material 30 to forward extrusion. Next, the head of the shaft member 30a is installed, and the shaft member 30b as shown in FIG. 2C is formed. Furthermore, the head part 32 provided with the stepped hollow part 31 used as the inner peripheral shape of the axial part 5 and the positioning cylinder part 9 is shape | molded by performing a head back extrusion molding to this shaft member 30b. Next, the wheel mounting flange 7 is molded by placing the head 32 so as to leave the height of the wheel mounting flange 7 using the molding die 40 shown in FIG.

  The molding die 40 includes a lower die 41 having an inner peripheral surface substantially the same diameter as the outer peripheral surface of the shaft portion 5, an upper die 43 having a hole 42 corresponding to the outer periphery D of the positioning cylinder portion 9, and an upper die A guide member 44 for preventing radial deformation that fits with the mold 43 and can be fitted to the inner peripheral surface of the positioning cylinder portion 9 is provided. As a result, the wheel mounting flange 7 is mounted by mounting the head 32 with the upper mold 43 leaving the height of the wheel mounting flange 7 while the shaft portion 5 of the wheel mounting flange 7 is held by the lower mold 41. The flange 7 is formed.

At this time, the upper mold 43 does not come into contact with the inner side of the outer periphery D of the positioning cylinder part 9 and only the outer side of the positioning cylinder part 9 is installed, and the head height H changes during such installation. Therefore, the positioning cylinder portion 9 is formed simultaneously with the wheel mounting flange 7. A guide member 44 for preventing radial deformation is fitted to the inner periphery of the hollow portion 31 of the positioning cylinder portion 9, but the end surface of the guide member 44 contacts the bottom surface of the positioning cylinder portion 9. I won't let you.
Note that the manufacturing method of the present embodiment can also be applied when manufacturing a hub wheel for an outer ring or a driven wheel.

  Therefore, in the present embodiment, after the shaft portion 5 and the hollow portion 31 are extruded from the hollow shaft portion material 30, the upper mold 43 having the hole 42 corresponding to the outer periphery of the positioning cylinder portion 9 is used. By installing the head 32 while leaving the height of the wheel mounting flange 7, it is not necessary to compress the inside of the outer periphery of the positioning cylinder portion 9 during the upsetting of the wheel mounting flange 7 with the highest processing load. Compared with the case where the whole is installed, the installation area is reduced and the wheel mounting flange 7 can be formed with a low load.

  As a result, the wheel mounting flange 7 can be formed by cold forging using a relatively small facility, and the cutting cost in the subsequent process is reduced, so that the inexpensive hub wheel 6 and the wheel supporting hub unit 1 are obtained. be able to. In addition, since the bending portion between the wheel mounting flange 7 and the outer peripheral portion of the shaft portion 5 is not bent, a sufficient thickness can be secured in the connecting portion, and the hub wheel 6 having sufficient strength and A wheel supporting hub unit 1 can be obtained.

  Further, since the inner peripheral side of the upper mold 43 can be used as the positioning cylinder portion 9 during upsetting, the cylindrical positioning cylinder portion 9 continuous in the circumferential direction is integrated with the shaft portion 5 with high accuracy. The material can be easily molded, and moreover, the extra thickness for mounting that is necessary when the positioning cylinder 9 is made separate is not necessary, so the material with the necessary part thickness secured. The yield can be improved, and thereby the manufacturing cost can be reduced.

(Second Embodiment)
Next, with respect to the method of manufacturing the bearing ring member of the wheel supporting hub unit according to the second embodiment of the present invention, the outer ring 3 for driving wheels according to the first embodiment is taken as an example of the bearing ring member with reference to FIG. Will be described in detail.

  As shown in FIG. 4A, the inner peripheral shape of the shaft portion 15 and the positioning cylinder portion 19 in FIG. A shaft member 50a having a head 52 provided with a hollow 51 is formed. Next, as shown in FIG. 4 (c), the head 52 is suspended by mounting the head 52 with a deformed mold (not shown), thereby mounting the head 52 on the suspension device mounting flange 18. Are formed in a different outer peripheral shape having the same number of radial protrusions 53 as the number of mounting holes 18a provided in the outer periphery. Further, in the upsetting process of FIG. 4D, an upper mold (not shown) having a hole corresponding to the outer periphery D of the positioning cylinder portion 19 is used, and the shaft portion 15 is a lower mold (not shown). The suspension device mounting flange 18 is formed by placing the head 52 without restraining the outer periphery while leaving the height of the suspension device mounting flange 18 in a state where the suspension device 18 is held.

  At this time, since the head 52 of the intermediate material in the irregular shape upsetting process has an irregular shape, the suspension device mounting flange 18 installed in the upsetting process also has an irregular shape, and the installation area is minimized. Therefore, the molding load is reduced, and the head height H does not change, so that the positioning cylinder portion 19 is molded at the same time.

Next, by the step forming process (thin wall process) shown in FIG. 4 (e), the space between the radial protrusions 42 adjacent to each other in the circumferential direction is thinly installed, and unnecessary portions of the suspension device mounting flange 18 are thinned. After forming the portion 54, as shown in FIG. 4 (f), the outer ring 3 is manufactured by removing surplus portions by trimming. In addition, since the upsetting in the stepping step is only the thin portion 54 and the other portions are not compressed, the molding load can be reduced.
The manufacturing method of the present embodiment can also be applied when manufacturing a hub wheel for a driving wheel or a hub wheel for a driven wheel.

Therefore, in the present embodiment, after the extrusion process, the outer shape of the head 52 having the radial protrusion 53 is changed to a different shape in the irregular shape forming step, so that the outer periphery of the suspension device mounting flange 18 before installation is changed. By making the shape different, the area of the upsetting portion during upsetting can be reduced, and the molding load can be kept low. Further, when only the thin portion 54 is installed on the suspension device mounting flange 18, the outer periphery after installation can be reduced, so that the molding load can be kept low, and the trim amount on the outer periphery is reduced. Yield can be improved.
Other operational effects are the same as those in the first embodiment, and a description thereof will be omitted.

(Third embodiment)
Next, regarding the method of manufacturing the bearing ring member of the wheel supporting hub unit according to the third embodiment of the present invention, the hub ring 6 ′ for the driven wheel shown in FIG. Details will be described with reference to FIG.

  First, a shaft member 60a shown in FIG. 5B is formed by subjecting a solid shaft material 60 as shown in FIG. 5A to forward extrusion molding. Next, the head of the shaft member 60a is installed, and a shaft member 60b as shown in FIG. 5C is formed. Further, as shown in FIG. 5 (d), by subjecting the shaft member 60b to the head rear extrusion, the recess 51, which is the inner peripheral shape of the shaft 5 'and the positioning cylinder 9', is extruded. At the same time, the number of mounting holes 7a 'provided in the wheel mounting flange 7' is formed by forming the outer diameter of the head 62 in a different shape by making the inner diameter of the mold (not shown) different. The outer peripheral shape of the unusual shape which has the same number of radial protrusions 63 is formed. Next, in the upsetting process of FIG. 5 (e), an upper mold (not shown) having a hole corresponding to the outer periphery D of the positioning cylinder part 9 ′ is used, and the shaft part 5 ′ is used as a lower mold (not shown). The wheel mounting flange 7 'is formed by placing the head 62 without restraining the outer periphery while leaving the height H of the wheel mounting flange 7 in a state where the wheel mounting flange 7 is held.

  At this time, since the head of the intermediate material in the head rear extrusion process has an irregular shape, the wheel mounting flange 7 ′ installed in the installation process also has an irregular shape, and the installation area is minimized. Since the molding load is reduced and the height H does not change, the positioning cylinder portion 9 'is molded at the same time.

Next, by the step forming process (thin wall process) shown in FIG. 5 (f), the gap between the radial protrusions 63 adjacent to each other in the circumferential direction is thinly installed, and unnecessary portions of the wheel mounting flange 7 ′ are thinned. After that, the excess wheel is removed by trim processing shown in FIG. It should be noted that the upsetting in the stepping step is only the portion that becomes the thin portion 22 'and the other portions are not compressed, so the molding load can be reduced. In the trim processing, if the unnecessary surplus is trimmed, the wheel mounting flanges 7 'and the thin portions 22' having different thicknesses are formed.
Note that the manufacturing method of the present embodiment can also be applied when manufacturing a hub wheel for an outer wheel or a driving wheel.

Therefore, in this embodiment, at the same time as forming the head 62 having the shaft portion 5 ′ and the recessed portion 51 in the head rear extrusion process, the outer peripheral shape of the head 62 having the radial protrusion 63 is made different. Thus, the outer peripheral shape of the wheel mounting flange 7 ′ before installation can be made different, and the area of the upsetting portion during upsetting can be reduced, so that the molding load can be kept low. Further, in the thin-wall process in which only the thin-walled portion 22 'is installed with respect to the wheel mounting flange 7', the molding load can be kept low by reducing the outer periphery after installation, and the trim amount on the outer periphery can be reduced. Since it decreases, the yield can be improved.
Other operational effects are the same as those in the first embodiment, and a description thereof will be omitted.

In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.
In the present embodiment, the double row rolling bearing in which the outer ring 3 is externally fitted to the end of the hub wheel 6 is exemplified as the bearing portion. However, instead of this, two rows of single row angular contact ball bearings and 2 In addition to the single row tapered roller bearings in a row, the present invention may be applied to a race ring member of a wheel supporting hub unit that employs a double row rolling bearing in which an inner ring is divided at a substantially central portion in the axial direction.

  Further, in the present embodiment, the driving wheel member of the wheel supporting hub unit for the driving wheel of the inner ring rotation and the driving wheel member of the wheel supporting hub unit for the driven wheel of the inner ring rotation are illustrated. Of course, the present invention may be applied to the raceway member of a wheel support hub unit for a driving wheel or a driving wheel for rotating an outer ring.

It is sectional drawing which shows an example of the hub unit for wheel support of this invention. It is process drawing for demonstrating the manufacturing method of the track ring member of the hub unit for wheel support which is 1st Embodiment of this invention. It is sectional drawing which shows an example of an upset mold. It is process drawing for demonstrating the manufacturing method of the track ring member of the hub unit for wheel support which is 2nd Embodiment of this invention. It is process drawing for demonstrating the manufacturing method of the track ring member of the hub unit for wheel support which is 3rd Embodiment of this invention. It is a figure which shows the bearing ring member which has a thin part between attachment flanges, (a) is the figure seen from the axial direction, (b) is the VI-VI sectional view taken on the line of (a). It is a figure which shows the bearing ring member which has an irregular-shaped attachment flange, (a) is the figure seen from the axial direction, (b) is the VII-VII sectional view taken on the line of (a). FIG. 7 is a view for explaining a conventional manufacturing method of the bearing ring member shown in FIG. 6, where (a) is a view seen from the axial direction, and (b) is a cross-sectional view taken along line VIII-VIII of (a). It is a figure which shows a mode that the surplus of the attachment flange of the bearing ring member of FIG. 8 is removed by trim processing, (a) is the figure seen from the axial direction, (b) is the IX-IX sectional view taken on the line of (a). is there.

Explanation of symbols

1 Wheel support hub unit 2 Hub 3 Outer ring (Race member)
4 Rolling elements 6 Hub wheel (Raceway ring member)
5,15 Shaft 7 Wheel mounting flange (Mounting part)
9, 19 Cylindrical portion for positioning 18 Suspension device mounting flange (mounting portion)
30, 50, 60 Shaft material 40 Mold 53, 63 Radial protrusion 22 'Thin part

Claims (6)

A solid or hollow shaft part, a wheel or vehicle body mounting part extending radially outward from the shaft part, on the opposite side of the shaft part across the mounting part, and concentric with the shaft part A method of manufacturing a bearing member of a wheel-supporting hub unit having a wheel or a positioning cylinder portion of a vehicle body,
An extrusion step of extruding a head portion having an inner peripheral shape of the shaft portion and the positioning cylinder portion from a solid or hollow shaft portion material;
An upsetting step of forming the mounting portion by mounting the head while leaving the height of the mounting portion using a mold having a hole corresponding to the outer periphery of the positioning cylinder portion;
A method for manufacturing a bearing ring member of a wheel support hub unit, wherein the bearing ring member is formed by cold forging. After the extruding step, the head portion was constrained by an irregularly shaped mold and installed to form an irregular outer peripheral shape having the same number of radial protrusions as the number of attachment holes provided in the attachment portion. An irregular shape forming process for forming the head,
Further comprising
The upsetting step forms an attachment portion having an irregularly shaped outer periphery by using the mold to install the head without restraining the outer periphery of the attachment portion, leaving the height of the attachment portion. The method for manufacturing a race member of the hub unit for supporting a wheel according to claim 1. The extruding step simultaneously molds the head into an irregular outer shape having the same number of radial protrusions as the number of mounting holes provided in the mounting portion,
The upsetting step forms an attachment portion having an irregularly shaped outer periphery by using the mold to install the head without restraining the outer periphery of the attachment portion, leaving the height of the attachment portion. The method for manufacturing a race member of the hub unit for supporting a wheel according to claim 1.   4. The wheel support hub unit raceway according to claim 2, further comprising a thin-walled step of thinly placing between the radially projecting portions adjacent to each other in the circumferential direction after the upsetting step. 5. A manufacturing method of a ring member. A solid or hollow shaft portion, a wheel or a vehicle body mounting portion extending radially outward from the shaft portion, a wheel disposed concentrically on the opposite side of the shaft portion with the mounting portion interposed therebetween, or A wheel ring member of a wheel supporting hub unit having a positioning cylinder part of a vehicle body,
A bearing ring member for a wheel-supporting hub unit manufactured by the manufacturing method according to claim 1. A wheel support hub unit in which an inner member, an outer member, and a bearing portion having at least a rolling element are disposed between the inner member and the outer member,
The wheel support hub unit according to claim 5, wherein at least one of the inner member and the outer member is the race ring member according to claim 5.

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