JP2006071057A - Bearing unit for supporting wheel and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for performing finish machining of a mounting face 26 of a mounting flange 17 by a dry system without causing chips in accordance with machining to improve rotation balance after machining. <P>SOLUTION: While this bearing unit for supporting a wheel is assembled, an outer ring 6 is fixed, and a hub 8 is rotated. At the same time, an outer peripheral face of a back-up roller 30 is abutted on a part of an anti-mounting face 31 of the mounting flange 17 to support the part. In this condition, an outer peripheral face of a roller 32 for molding is pressed against a part where it is aligned with a contact part of the back-up roller 30 and the anti-mounting face 31 in a mounting face 26. Consequently, finish machining of the mounting face 26 is performed based on plastic deformation of the pressed part. By adopting a finish machining method like this, the above task is solved. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wheel support bearing unit for rotatably supporting a vehicle wheel and a braking rotary member with respect to a suspension device, and a manufacturing method thereof.

  A wheel 1 constituting a wheel of an automobile and a disc 2 constituting a disc brake as a braking device are rotatably supported by a knuckle 3 constituting a suspension device, for example, by a structure as shown in FIG. That is, the outer ring 6 that is a stationary wheel and that constitutes the wheel support bearing unit 5 is fixed to the circular support hole 4 formed in the knuckle 3 by a plurality of bolts 7. On the other hand, the wheel 1 and the disk 2 are coupled and fixed to a hub 8 constituting the wheel support bearing unit 5 by a plurality of studs 9 and nuts 10.

  Double row outer ring raceways 11a and 11b are formed on the inner peripheral surface of the outer ring 6, and a coupling flange 12 is formed on the outer peripheral surface. Such an outer ring 6 is fixed to the knuckle 3 by connecting the connecting flange 12 to the knuckle 3 with the bolts 7. For this purpose, in the illustrated example, the bolts 7 are inserted into through holes 13 formed at a plurality of locations in the circumferential direction of the knuckle 3, and the tip portions of the bolts 7 are connected to the circles of the coupling flange 12. The screw holes 14 formed at a plurality of locations in the circumferential direction are screwed together and further tightened.

  The hub 8 is a combination of a hub body 15 and an inner ring 16. Of these, a part of the outer peripheral surface of the hub body 15 is the outer end opening of the outer ring 6 (outside with respect to the axial direction means outside in the width direction of the vehicle in the assembled state in the automobile, and in each figure except FIG. On the contrary, the right side of each figure except FIG. 3, which is the inner side in the width direction when assembled to the automobile, is referred to as the inner side with respect to the axial direction, and is the same throughout the present specification and claims. A mounting flange 17 is formed in the part. The wheel 1 and the disk 2 are coupled and fixed to the mounting surface 26 (outer surface in the illustrated example) of the mounting flange 17 by the studs 9 and the nuts 10. Further, an inner ring raceway 18a is directly formed on the outer peripheral surface of the intermediate portion of the hub main body 15 at a portion of the double row outer ring raceways 11a, 11b that faces the outer outer raceway 11a. Further, the inner ring 16 is externally fitted and fixed to a small diameter step portion 19 formed at the inner end of the hub body 15. The inner ring raceway 18b formed on the outer peripheral surface of the inner ring 16 is opposed to the inner outer ring raceway 11b of the double row outer ring raceways 11a and 11b.

  Further, a plurality of balls 20, 20 each of which is a rolling element are provided between the outer ring raceways 11a, 11b and the inner ring raceways 18a, 18b so as to be freely rollable. In the case of an automobile bearing unit that is heavy, a tapered roller may be used as the rolling element. Further, since the illustrated example is a wheel support bearing unit 5 for driving wheels (front wheels of FF vehicles, rear wheels of FR and RR vehicles, all wheels of 4WD vehicles), the hub body 15 has a central portion. The spline hole 21 is formed. The spline shaft 23 of the constant velocity joint 22 is inserted into the spline hole 21.

  When the wheel support bearing unit 5 as described above is used, the outer ring 6 is fixed to the knuckle 3 and the wheel 1 and the disk 2 are fixed to the mounting flange 17 of the hub 8 as shown in FIG. Further, a disc brake for braking is configured by combining the disc 2 among them and a support and caliper (not shown) fixed to the knuckle 3. During braking, a pair of pads provided across the disk 2 is pressed against a pair of braking friction surfaces 24, 24 provided on both side surfaces of the radially outer half of the disk 2.

  Next, FIG. 5 shows a second example of a conventionally known wheel support bearing unit for a driven wheel (rear wheel of FF vehicle, front wheel of FR vehicle and RR vehicle). Since the wheel support bearing unit 5a constituting the wheel support bearing unit with disk is for a driven wheel, a spline shaft as a drive shaft is inserted into the center of the hub body 15a constituting the hub 8a. No spline hole is provided. In the case of the illustrated example, the inner end surface of the inner ring 16 that is externally fitted to the small-diameter step portion 19 of the hub main body 15a is formed by crimping the inner end portion of the hub main body 15a in a radially outward direction. 25. The structure and operation of the other parts are the same as in the case of the first example shown in FIG.

  Next, FIG. 6 shows a driven wheel as a third example of a conventionally known wheel supporting bearing unit. In the wheel support bearing unit 5b of the third example, a hub 8b having a mounting flange 17 at a portion near the outer end of the outer peripheral surface is formed in a cylindrical shape. At the same time, double-row outer ring raceways 11a and 11b are formed in the middle or inner end of the inner peripheral surface of the hub 8b. In addition, a pair of inner rings 16a and 16b, each of which is a stationary ring, are provided on the radially inner side of the hub 8b. A plurality of balls 20 and 20 are provided between the inner ring raceways 18a and 18b formed on the outer peripheral surfaces of the inner races 16a and 16b and the outer ring raceways 11a and 11b, respectively, so as to be capable of rolling. .

  When the wheel support bearing unit 5b of the third example configured as described above is assembled to an automobile, the inner rings 16a and 16b are attached to a support shaft (not shown) that constitutes a suspension device and does not rotate during use. Fix externally. At the same time, the inner rings 16a and 16b are clamped in the axial direction between the stepped surface formed on the outer peripheral surface of the intermediate portion of the support shaft and the nut screwed to the tip end portion of the support shaft. A preload is applied to the balls 20 and 20 by bringing the end faces of the inner rings 16a and 16b into contact with each other. Further, the wheel 1 and the disk 2 (see FIG. 4) are fixed to the mounting surface 26 of the mounting flange 17.

  By the way, in the case of the wheel support bearing unit having various structures as described above, the rotational runout accuracy (accuracy related to axial runout accompanying rotation) and flatness of the mounting surface 26 of the mounting flange 15 are good. Otherwise, it becomes difficult to improve the rotational runout accuracy of the pair of braking friction surfaces 24 and 24 constituting the disk 2. If the rotational deflection accuracy of each of the braking friction surfaces 24, 24 cannot be improved, abnormal noise accompanied by vibration called judder is generated during braking, which is not preferable. Therefore, in order to prevent such inconvenience, conventionally, after assembling the wheel support bearing unit, the stationary wheel is fixed and the hub is rotated. By performing grinding, the rotational runout accuracy and flatness of the mounting surface 26 are improved (see, for example, Patent Documents 1 and 2).

  However, when such a conventional technique is implemented, foreign substances such as cutting oil, grinding oil, and chips and grindstone powder generated during processing can enter the space where the balls 20 and 20 are installed. There is sex. In case of intrusion, the lubricating grease enclosed in the space deteriorates early, or the surfaces of the balls 20, 20 and the tracks 11a, 11b, 18a, 18b are damaged, This is not preferable because the durability of the supporting bearing unit may be reduced. Therefore, in order to prevent such inconvenience, it is necessary to prepare equipment for preventing the foreign matter from entering the space when the prior art is implemented. As a result, in the case of the above-described prior art, the implementation cost increases because it is necessary to prepare such equipment. Further, in the case of the above prior art, in order to improve the rotational runout accuracy and flatness of the mounting surface 26, the mounting surface 26 is scraped. Thus, there is a possibility that the rotational balance of the wheel supporting bearing unit is deteriorated.

US Pat. No. 6,415,508 US Pat. No. 6,071,180

  In view of the circumstances as described above, the wheel support bearing unit and the manufacturing method thereof according to the present invention have the rotational runout accuracy of the mounting surface of the mounting flange without lowering or deteriorating the durability and rotation balance of the wheel support bearing unit. The present invention was devised so as to improve the flatness at a low cost.

  A bearing unit for supporting a wheel, which is a subject of the present invention, has a double-row stationary side track on a stationary side circumferential surface, a stationary wheel that does not rotate even when in use, and a rotating side circumferential surface that faces the stationary side circumferential surface. A double row rotation side track has mounting flanges for attaching wheels and braking rotary members to the outer peripheral surface, and is between a hub that rotates during use, and each stationary side track and each rotation side track. And a plurality of rolling elements provided in a freely rotatable manner.

  According to a first aspect of the present invention, there is provided a wheel support bearing unit manufacturing method comprising: assembling the stationary wheel, the hub, and the rolling elements together; fixing the stationary wheel; and rotating the hub The outer peripheral surface of the backup roller that is rotatable about its own central axis is brought into contact with a part of the non-mounting surface that is a side surface that does not contact the braking rotating member among both side surfaces of the mounting flange. Support. At the same time, of the both side surfaces of the mounting flange, a part of the mounting surface that is a side surface with which the brake rotating member is brought into contact with the contact portion between the outer peripheral surface of the backup roller and the anti-mounting surface. Then, the outer peripheral surface or outer peripheral edge of the molding roller which is rotatable around its own central axis is pressed to plastically deform the portion. Thereby, the rotational deflection accuracy and flatness of the mounting surface are improved.

  In the wheel support bearing unit according to the sixth aspect of the present invention, the mounting surface is the above-described one of the both side surfaces of the mounting flange provided in the wheel support bearing unit. 1 (or any one of claims 2 to 5 described later).

  As described above, in the case of the wheel support bearing unit and the manufacturing method thereof according to the present invention, after assembling the stationary wheel, the hub, and the respective rolling elements, the stationary wheel is fixed and the hub is rotated. The mounting surface is processed. For this reason, as in the case of the prior art described above, the rotational deflection accuracy and flatness of the mounting surface can be improved. Particularly in the case of the present invention, the mounting surface is processed by pressing the outer peripheral surface of the molding roller against a part of the mounting surface and plastically deforming the portion. Such a mounting surface can be processed not only dry (without supplying oil to the processing site) but also without generating chips or grinding stone powder. For this reason, in the case of the present invention, it is possible to eliminate the possibility that foreign matters such as oil and chips enter the space where the plurality of rolling elements are installed when the mounting surface is processed. Therefore, in the case of the present invention, it is not necessary to use equipment for preventing this foreign substance from entering, and the mounting surface can be processed at a low cost.

  In the case of the present invention, in order to improve the rotational runout accuracy and flatness of the mounting surface, the mounting flange is not cut and the mounting flange is plastically deformed between the backup roller and the molding roller. For this reason, even if the rotational runout accuracy and flatness of the mounting surface before processing deteriorate due to dimensional errors and assembly errors that are unavoidable in manufacturing, the thickness dimension of the mounting flange after processing is almost the same over the entire circumference. Can be uniform. Therefore, in the case of the present invention, it is possible to prevent the rotation balance of the wheel supporting bearing unit after the mounting surface is processed from being deteriorated.

  Further, in the case of the present invention, since the mounting surface is plastically processed, the mounting surface can be hardened, and the surface roughness of the mounting surface can be reduced.

When carrying out the invention described in claim 1, preferably as described in claim 2, the width T ₁ of the contact portion of the outer peripheral surface or outer peripheral edge of the forming roller relative to the mounting surface, anti-mounting surface Is smaller than the width dimension T ₂ of the contact portion of the outer peripheral surface of the backup roller (the relationship of T ₁ <T ₂ is established).
If in this manner, the contact area of the peripheral surface or outer peripheral edge of the forming roller relative to the mounting surface S ₁ and (contact surface pressure P _1), the contact area S ₂ (the contact surface pressure of the outer peripheral surface of the backup roller with respect to anti-mounting surface P ₂ ) can cause a difference (S ₁ <S ₂ , P ₁ > P ₂ ). As a result, only the mounting surface can be plastically deformed without plastically deforming the anti-mounting surface. In this case, in particular, the width T ₁ of the contact portion of the outer peripheral surface or outer peripheral edge of the molding roller with respect to the mounting surface is compared with the width dimension T ₂ of the contact portion of the outer peripheral surface of the pack-up roller with respect to the anti-mounting surface. The mounting surface can be machined with a smaller machining load as it is made smaller. Further, as the width dimension T ₂ of the contact portion of the outer peripheral surface of the backup roller with respect to the anti-attachment surface is increased, the anti-attachment surface is less likely to be plastically deformed.

More preferably, as described in claim 3, the pressing position is moved in the radial direction of the mounting flange while the outer peripheral surface or outer peripheral edge of the molding roller is pressed against the mounting surface of the mounting flange.
In this way, the mounting surface can be processed with a small processing load.

More preferably, as described in claim 4, the diameter D ₁ of the outer peripheral surface or outer peripheral edge of the molding roller is made smaller than the diameter D ₂ of the outer peripheral surface of the backup roller (D ₁ <D ₂ relationship is established).
In this way, as in the case of the invention described in claim 2 above, the contact area S ₁ (contact surface pressure P ₁ ) of the outer peripheral surface or outer peripheral surface of the molding roller with respect to the mounting surface, and the anti-mounting A difference (S ₁ <S ₂ , P ₁ > P ₂ ) can be generated between the contact area S ₂ (contact surface pressure P ₂ ) of the outer peripheral surface of the backup roller with respect to the surface. As a result, only the mounting surface can be plastically deformed without plastically deforming the anti-mounting surface. In this case, in particular, the smaller the diameter D ₁ of the outer peripheral surface or outer peripheral edge of the forming rollers, allows the machining of the mounting surfaces with a small processing load. Also, the larger the diameter D ₂ of the outer peripheral surface of the backup roller can be the counter-mounting surface hardly plastically deformed.

More preferably, as described in claim 5, an annular shape having a radial width dimension smaller than a width dimension of the outer peripheral surface of the backup roller, extending over the entire circumference in a part of the radial direction of the mounting surface of the mounting flange. The projecting portion is provided, and the axial end surface of the projecting portion is processed by a molding roller.
In this way, the processing area of the mounting surface can be reduced (the processing area can be limited to the axial end surface of the protruding portion), so that the processing time of the mounting surface can be shortened. Further, when processing the mounting surface, only the axial end surface of the protruding portion of the mounting surface is in contact with the outer peripheral surface or outer peripheral edge of the molding roller. The contact area with the surface or the outer peripheral edge can be reduced (contact surface pressure can be increased). Therefore, the mounting surface can be processed with a small processing load.

  FIG. 1 shows Embodiment 1 of the present invention corresponding to claims 1 to 4 and 6. The feature of this embodiment is the finishing method of the mounting surface 26 of the mounting flange 17. Since the structure and operation of the other parts are almost the same as in the case of the conventional structure shown in FIG. 4, the same reference numerals are given to the same parts, and overlapping explanations are omitted or simplified. The description will focus on the features of the example.

  In this embodiment, in order to finish the mounting surface 26, first, as shown in FIG. 1, the hub body 15, the inner ring 16, and the outer ring before finishing the mounting surface 26 are processed. 6 and a plurality of balls 20, 20 are assembled together. In this state, the outer ring 6 is fixed by gripping the outer peripheral surface of the inner end portion of the outer ring 6 with the chuck 27. Further, by rotating the drive shaft 28 with the male spline portion 29 provided at the tip of the drive shaft 28 engaged with the spline hole 21 of the hub body 15, the hub main body 15 and the inner ring 16 ( The hub 8) is rotated relative to the outer ring 6. In this state, the outer peripheral surface (cylindrical surface) of the backup roller 30 is rotatable around the central axis α, and the central axis α is aligned with the radial direction of the mounting flange 17 (vertical direction in FIG. 1). ) In a rolling contact with a sufficiently large supporting force (for example, with an appropriate preload) on a part in the circumferential direction of the anti-mounting surface 31 (inner surface) of the mounting flange 17, Support with sufficient rigidity to prevent displacement to the right.

  In this state, the outer peripheral surface (cylindrical surface) of the molding roller 32 that is rotatable around the central axis β and that is aligned with the radial direction of the mounting flange 17 is the mounting flange. By pressing (strongly rolling contact) a portion of the mounting surface 26 of 17 that is aligned with the contact portion between the outer peripheral surface of the backup roller 17 and the anti-mounting surface 31 (opposite the axial direction of the hub body 15). The part is plastically deformed. Further, in the case of the present embodiment, the molding roller 32 is moved in the radial direction of the mounting flange 17 (for example, as shown by an arrow A in FIG. The entire mounting surface 26 (or a part of the annular region in contact with the braking rotating member) is subjected to plastic working by moving it at a predetermined feed rate from the radial direction toward the inner end in the radial direction. Thereby, the part which gave this plastic working is finished in a plane with favorable rotational runout accuracy and flatness. When the molding roller 32 is moved in the radial direction as described above, the backup roller 30 is also provided as necessary so that the alignment relationship between the molding roller 32 and the backup roller 30 is maintained. Move in the radial direction. The molding roller 32 and the backup roller 30 may be reciprocated in the radial direction of the mounting flange 17.

In the present embodiment, the dimensions of the molding roller 32 and the backup roller 30 are regulated so that the mounting surface 26 can be plastically processed by the molding roller 32 as described above. is doing. Specifically, the width dimension W ₁ of the outer peripheral surface of the molding roller 32 (the width dimension T ₁ of the contact portion of the outer peripheral surface with respect to the mounting surface 26) and the diameter dimension D ₁ are respectively set to the outer periphery of the backup roller 30. The width dimension W _{2 of the} surface (width dimension T ₂ of the contact portion of the outer peripheral surface with respect to the anti-mounting surface 31) and the diameter dimension D ₂ are smaller than {W ₁ <W ₂ (T ₁ <T ₂ ), D ₁ < D ₂ }. As a result, the contact area S ₁ (contact surface pressure P ₁ ) of the outer peripheral surface of the molding roller 32 with respect to the mounting surface 26 and the contact area S ₂ of the outer peripheral surface of the backup roller 30 with respect to the non-attachment surface 31 (contact) A difference (S ₁ <S ₂ , P ₁ > P ₂ ) is given to the surface pressure P ₂ ). Then, by giving such a difference, plastic deformation does not occur (or is unlikely to occur) in a part of the anti-attachment surface 31 with which the outer peripheral surface of the backup roller 30 is in contact, and the molding is performed. Plastic deformation is caused only at a part (or mainly at a part) of the mounting surface 26 with which the outer peripheral surface of the roller 32 is brought into contact.

  As described above, in the case of the wheel support bearing unit of the present embodiment and the manufacturing method thereof, after the outer ring 6, the hub 8, and the plurality of balls 20, 20 are assembled together, the outer ring 6 is fixed, The mounting surface 26 is processed while rotating the hub 8. For this reason, as in the case of the prior art described above, the rotational runout accuracy and flatness of the mounting surface 26 can be improved. In particular, in the case of the present embodiment, the mounting surface 26 is processed by pressing the outer peripheral surface of the molding roller 32 against a part of the mounting surface 26 and plastically deforming the portion. Such mounting surface 26 can be processed dry (without supplying oil to the processing site). In addition, when the mounting surface 26 is processed, chips and grindstone powder are not generated. For this reason, in the case of the present embodiment, when the mounting surface 26 is processed, there is no possibility that foreign matters such as oil and chips enter the space where the balls 20 and 20 are installed. Therefore, in the case of the present embodiment, it is not necessary to use equipment for preventing this foreign substance from entering, and the mounting surface 26 can be processed at a low cost.

  In the case of this embodiment, in order to improve the rotational runout accuracy and flatness of the mounting surface 26, the mounting flange 17 is not shaved, and the mounting flange 17 is connected to the backup roller 30 and the molding roller 32. Plastic deformation between them. For this reason, even if the rotational runout accuracy and flatness of the mounting surface 26 before processing deteriorate due to dimensional errors and assembly errors unavoidable in manufacturing, the thickness dimension of the mounting flange 17 after processing is set to the entire circumference. Can be almost uniform. Therefore, in the case of the present embodiment, it is possible to prevent the rotational balance of the wheel supporting bearing unit after the mounting surface 26 is processed from being deteriorated. Further, in the case of this embodiment, since the mounting surface 26 is plastically processed, the mounting surface 26 can be hardened, and the surface roughness of the mounting surface 26 can be reduced.

  Next, FIG. 2 shows Embodiment 2 of the present invention, which also corresponds to claims 1 to 4 and 6. In the case of the present embodiment, the outer ring 6 is coupled and fixed by bolts 34 to an outer ring fixture 33 such as a support base. The drive shaft 28a for rotating the hub 8 is frictionally engaged with the bottom surface 36 of the circular hole 35 provided at the outer end of the hub 8 by frictionally engaging the front end surface of the drive shaft 28a. Rotation force can be transmitted freely.

Further, in the case of the present embodiment, the width dimension W ₁ and the diameter dimension D ₁ of the outer peripheral edge of the molding roller 32a brought into contact with the mounting surface 26 of the mounting flange 17 are the same as those of the first embodiment shown in FIG. It is smaller than the case. In particular, in order to reduce the width dimension W ₁ , the outer peripheral surface of the molding roller 32a is a chevron-shaped convex surface, and only the narrow edge (outer peripheral edge) present at the center in the width direction of the outer peripheral surface is The mounting surface 26 is pressed. The outer peripheral edge of the molding roller 32a can be a convex curved surface having an arcuate cross section. In the case of this embodiment configured as described above, the mounting surface 26 is processed while the molding roller 32a is moved little by little in the radial direction of the mounting flange 17. In this embodiment, since the contact surface pressure P ₁ of the outer peripheral edge of the molding roller 32a with respect to the mounting surface 26 can be sufficiently increased, the mounting surface 26 can be plastically processed with a small processing load. Further, since the contact surface pressure P ₂ of the outer peripheral surface of the backup roller 30 with respect to the non-mounting surface 31 of the mounting flange 17 can be made sufficiently larger than the contact surface pressure P ₁ , plastic deformation occurs on the non-mounting surface 31 side. What happens can be more reliably prevented. In the case of this embodiment, when the mounting surface 26 is plastically processed, the molding roller 32a is tilted with respect to the radial direction of the mounting flange 17 so that the molding roller 32a is inclined. It is also possible to press the outer peripheral edge of the roller 32a against the mounting surface 26. In this case, it is preferable that the outer peripheral edge of the molding roller 32a is a convex curved surface having an arc cross section. Other configurations and operations are the same as those of the first embodiment described above.

Next, FIG. 3 shows Embodiment 3 of the present invention corresponding to claims 1 to 6. In the case of the present embodiment, a concave portion 38 is formed in an annular region including the opening portions of the mounting holes 37 and 37 of the stud 9 (see FIG. 4) at the radial intermediate portion of the mounting surface 26a of the mounting flange 17a. ing. As a result, of the mounting surface 26 a, the protruding portions 39 that protrude in the axial direction from the bottom surface of the concave portion 38 respectively on both radial side portions of the concave portion 38 (portions shown with diagonal lattices in FIG. 3). , 40 are provided. Of these, the width dimension W ₃ of the radially outer protrusion 39 is the width dimension W ₂ of the outer peripheral surface of the backup roller 30 used when finishing the mounting surface 26a (see FIGS. 1 and 2). (W ₃ <W ₂ ). In the case of the present embodiment, by providing the projecting portions 39 and 40 as described above, only the portions corresponding to the projecting portions 39 and 40 of the mounting surface 26a are provided with the braking rotating member. Is in contact. In connection with this, in the case of the present embodiment, only the portions of the mounting surface 26a corresponding to the protrusions 39 and 40 are finished by the molding roller.

In the case of this embodiment, the processing area of the mounting surface 26a by the molding roller can be reduced (only the part corresponding to the protrusions 39 and 40 can be formed). For this reason, the finishing time of the mounting surface 26a can be shortened. Further, when the molding roller having a width dimension W ₁ of the outer peripheral surface larger than the width dimension W _{3 of the} radially outer protruding portion 39 is used, the mounting surface 26a is formed by the molding roller. When finishing the radially outer portion, only the distal end surface of the radially outer protruding portion 39 comes into contact with the outer peripheral surface of the molding roller. As a result, the surface pressure of the contact portion is increased, so that the end surface of the protruding portion 39 can be finished with a small processing load. Other configurations and operations are the same as those in the first and second embodiments.

Sectional drawing which shows Example 1 of this invention. Sectional drawing which shows the same Example 2. FIG. The figure seen from the axial direction outer side of the hub which shows the same Example 3. FIG. Sectional drawing which shows the 1st example of the bearing unit for wheel support conventionally known in the state which attached the wheel and the rotating member for braking. Sectional drawing which shows the 2nd example in the state which attached the rotating member for braking. Sectional drawing which shows the 3rd example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wheel 2 Disc 3 Knuckle 4 Support hole 5, 5a, 5b Wheel support bearing unit 6 Outer ring 7 Bolt 8, 8a, 8b Hub 9 Stud 10 Nut 11a, 11b Outer ring raceway 12 Coupling flange 13 Through hole 14 Screw hole 15, 15a Hub body 16, 16a, 16b Inner ring 17, 17a Mounting flange 18a, 18b Inner ring race 19 Small diameter step 20 Ball 21 Spline hole 22 Constant velocity joint 23 Spline shaft 24 Braking friction surface 25 Caulking portion 26, 26a Mounting surface 27 Chuck 28 28a Drive shaft 29 Male spline portion 30 Backup roller 31 Anti-attachment surface 32, 32a Molding roller 33 Outer ring fixture 34 Bolt 35 Circular hole 36 Bottom surface 37 Mounting hole 38 Recessed portion 39 Protruding portion 40 Protruding portion

Claims (6)

  A stationary wheel having a double row stationary side track on the stationary side circumferential surface, which does not rotate during use, a double row rotational side track on the rotating side circumferential surface facing the stationary side circumferential surface, a wheel on the outer circumferential surface and A plurality of rolling flanges, each having a mounting flange for mounting a brake rotating member, are provided so as to be freely rotatable between a hub that rotates during use, and each stationary side track and each rotating side track. A wheel support bearing unit comprising a moving body, wherein the stationary wheel, the hub, and the rolling elements are assembled together, the stationary wheel is fixed, and the hub is rotated while the hub is rotated. The outer peripheral surface of the backup roller that is rotatable about its own central axis is brought into contact with a part of the opposite mounting surface, which is the side surface of the mounting flange that does not contact the braking rotating member, to support the portion. And both mounting flanges A part of the mounting surface that is a side surface that contacts the rotating member for braking of the surface, and can be rotated around its own central axis at a portion aligned with the contact portion between the outer peripheral surface of the backup roller and the anti-mounting surface. A method for manufacturing a wheel support bearing unit, in which a rotational deflection accuracy and flatness of the mounting surface are improved by pressing the outer peripheral surface or outer peripheral edge of the molding roller and plastically deforming the portion. The wheel according to claim 1, wherein a width dimension T ₁ of a contact portion of the outer peripheral surface or outer peripheral edge of the molding roller with respect to the mounting surface is smaller than a width dimension T ₂ of a contact portion of the outer peripheral surface of the backup roller with respect to the anti-mounting surface. Manufacturing method of support bearing unit.   The manufacturing method of the wheel-supporting bearing unit according to claim 2, wherein the pressing position is moved in the radial direction of the mounting flange while pressing the outer peripheral surface or outer peripheral edge of the molding roller against the mounting surface of the mounting flange. Diameter D ₁ of the outer peripheral surface or outer peripheral edge of the forming roller is smaller than the diameter D ₂ of the outer peripheral surface of the backup roller, a manufacturing method of a wheel supporting bearing unit as set forth in claim 1.   An annular projecting portion is provided on a part of the mounting flange's mounting surface in the radial direction over the entire circumference, and the radial width dimension is smaller than the width dimension of the outer peripheral surface of the backup roller. The wheel-supporting bearing unit according to any one of claims 1 to 4, wherein the wheel-supporting bearing unit is processed by a roller.   A stationary wheel having a double row stationary side track on the stationary side circumferential surface, which does not rotate during use, a double row rotational side track on the rotating side circumferential surface facing the stationary side circumferential surface, a wheel on the outer circumferential surface and A plurality of rolling flanges, each having a mounting flange for mounting a brake rotating member, are provided so as to be freely rotatable between a hub that rotates during use, and each stationary side track and each rotating side track. In the wheel support bearing unit provided with the moving body, the manufacturing method according to any one of claims 1 to 5, wherein the mounting surface to which the wheel and the braking rotating member are mounted among the both side surfaces of the mounting flange. Wheel support bearing unit characterized by being machined by

Images