JP2005306257A - Bearing device for wheel with brake rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel with a brake rotor which realizes its reduction in weight and miniaturization, and increases design flexibility of the brake rotor. <P>SOLUTION: The brake rotor 12 is mounted on a flange 7 for attaching the wheel of a hub wheel 1 of the bearing device for the wheel with the brake rotor. Then the brake rotor 12 comprises an intermediate member 15 and a brake disk 16. The intermediate member consists of a metallic material which has higher thermal conductivity than a metal constituting the hub wheel 1, and the brake disk 16 comprises a disc-shaped composite material which is separate from the intermediate member 15. Further, the intermediate member 15 has a disc-shaped base part 17, a cylindrical part 18, and an attaching part 19. The disc-shaped base part is fixed to the flange 7 for attaching the wheel with removability, and the cylindrical part, which is axially extended from the base part 17, is engaged with the outside diameter of the flange 7 for attaching the wheel through predetermined guide clearance. Furthermore, the attaching part is extended from the cylindrical part 18 in the outer radial direction, and the bearing device is constituted so that the brake disk 16 is fixed to the attaching part 19 with removability. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wheel bearing device with a brake rotor that rotatably supports a wheel of an automobile or the like.

  A wheel bearing device that rotatably supports a wheel with respect to a suspension device of an automobile has been made lighter and more compact for improving fuel efficiency, not to mention cost reduction. Normally, the brake rotor that constitutes the braking device is fixed to a wheel mounting flange integrally formed at one end of the hub wheel via a bolt. Recently, the brake rotor has been designed to further reduce weight and size. An integrated system has been proposed.

  When the brake rotor is integrally coupled to the hub wheel as described above, sufficient durability and reliability cannot be ensured even if the hub wheel and brake rotor made of the same material as the conventional one are combined. This is because the hub wheel is made of medium carbon steel such as S53C, while the brake rotor is made of cast iron, so the difference in linear expansion coefficient between them is large. The dimensional difference between the outer diameter of the wheel mounting flange and the inner diameter of the brake rotor may become so large that it cannot be ignored. When such a dimensional difference is generated, the fitting portion is lowered and the support thereof becomes incomplete, and uncomfortable vibration and noise may occur during braking.

  As a solution to these problems, a wheel bearing device with a brake rotor as shown in FIG. 8 is known. This wheel bearing device with a brake rotor is integrally provided with a vehicle body mounting flange 51b attached to a suspension device (not shown) on the outer periphery, and an outer periphery in which double-row outer rolling surfaces 51a and 51a are formed on the inner periphery. One side member 51 and a wheel mounting flange 52 for attaching a wheel (not shown) to one end are integrally formed, and a cylindrical small-diameter step portion 53a extending in the axial direction from the wheel mounting flange 52 is formed on the outer periphery. And a pair of inner rings 54, 54 that are press-fitted into the small-diameter stepped portion 53 a and are formed with inner rolling surfaces 54 a, 54 a facing the double-row outer rolling surfaces 51 a, 51 a on the outer periphery. The inner member 55 includes a plurality of rolling elements (balls) 56 and 56 interposed between the inner member 55 and the outer member 51 so as to be freely rollable.

On the outer diameter surface of the wheel mounting flange 52, the inner diameter surface of the brake rotor 57 is externally fitted with an interference fit and fixed by caulking. Here, the linear expansion coefficients of the hub wheel 53 and the brake rotor 57 are substantially matched. That is, the hub wheel 53 is made of medium carbon steel such as S45C, while the brake rotor 57 is made of spheroidal graphite cast iron such as FCD400. Therefore, the difference in linear expansion coefficient between the two is as small as 0.4 × 10 ^−6, and the change in the fitting portion is reduced regardless of a large temperature change with use, and the support of the fitting portion is reduced. It is possible to prevent the strength from decreasing.
JP 2003-54208 A

In such a conventional wheel bearing device with a brake rotor, there is no bolt fastening operation, and the brake rotor 57 is crimped and fixed to the wheel mounting flange 52, so that the assembling property can be improved and the weight and the size can be reduced. However, on the other hand, the following problems are inherent. That is,
1. Since the brake rotor 57 is integrated with the wheel mounting flange 52, maintenance of the brake rotor is difficult.
2. When a composite material such as ceramic reinforced aluminum is used for the brake rotor 57 for weight reduction, it is difficult to crimp and fix the fitting portion by plastic deformation.
3. Further, when such a composite material is used for the brake rotor 57, the amount of the expensive composite material used is increased, resulting in an increase in cost.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a wheel bearing device with a brake rotor which is designed to reduce the weight and size of the device and increase the degree of freedom in designing the brake rotor. .

  In order to achieve such an object, the invention according to claim 1 of the present invention integrally has an outer member having a double row outer rolling surface formed on the inner periphery, and a wheel mounting flange at one end, A hub ring having a small-diameter step formed on the outer periphery, and at least one inner ring press-fitted into the small-diameter step of the hub ring, an inner rolling surface facing the double-row outer rolling surface is formed. An inner member and a double-row rolling element that is rotatably accommodated between the rolling surfaces of the inner member and the outer member, and a brake rotor is attached to the wheel mounting flange. In the wheel bearing device with a brake rotor, the brake rotor includes an intermediate member and a disc-shaped brake disk separate from the intermediate member, and the intermediate member is fitted to the outer diameter of the wheel mounting flange. From the cylindrical part to be joined And a mounting portion extending outward, and adopt a configuration in which the brake disk is fixed to the mounting portion.

  Thus, in the wheel bearing device with a brake rotor in which the brake rotor is mounted on the wheel mounting flange of the hub wheel, the brake rotor includes an intermediate member, and a disc-shaped brake disk separate from the intermediate member. The intermediate member has a cylindrical portion fitted to the outer diameter of the wheel mounting flange and a mounting portion extending radially outward from the cylindrical portion, and the brake disc is fixed to the mounting portion. Therefore, it can be easily fixed even if a composite member such as ceramic reinforced aluminum is used for the brake disc, and the design freedom of the brake rotor is increased regardless of the physical property value such as the linear expansion coefficient. Weight reduction can be achieved.

  According to a second aspect of the present invention, the intermediate member has a disk-shaped base portion extending radially inward from the cylindrical portion, and the base portion is detachably fixed to the wheel mounting flange. Therefore, the brake rotor can be easily detached from the wheel bearing device, and maintenance of the brake rotor is facilitated.

  Preferably, as in the invention described in claim 3, if the thickness of the cylindrical portion is set larger than the thickness of the base portion and the mounting portion, the angular rigidity of the brake rotor can be improved. .

  In the invention according to claim 4, since the brake disc is detachably fixed to the intermediate member, the brake rotor can be easily detached from the wheel bearing device, and maintenance of the brake rotor is facilitated. In addition, even if a composite member such as ceramic reinforced aluminum is used for the brake disc, the expensive composite member can be suppressed to a minimum capacity and the cost increase can be suppressed.

  In the invention according to claim 5, since the plurality of perforations or recesses or notches are provided in the intermediate member, the weight of the brake rotor can be reduced.

  According to a sixth aspect of the present invention, since the intermediate member is made of a metal material having a higher thermal conductivity than the metal constituting the hub wheel, heat generated by the brake rotor is applied to the wheel mounting flange. Transmission can be suppressed and durability of the apparatus can be improved.

  In the invention according to claim 7, since the brake disc is formed of a composite member, the brake performance can be improved.

  The wheel bearing device with a brake rotor according to the present invention has an outer member having a double row outer raceway formed on the inner periphery, a wheel mounting flange on one end, and a small diameter step on the outer periphery. An inner member formed with a formed hub ring, and at least one inner ring press-fitted into a small-diameter step portion of the hub ring, and formed with an inner rolling surface facing the outer rolling surface of the double row; A wheel bearing with a brake rotor, comprising a double row rolling element that is rotatably accommodated between the rolling surfaces of the inner member and the outer member, and a brake rotor attached to the wheel mounting flange. In the apparatus, the brake rotor includes an intermediate member and a disc-shaped brake disc separate from the intermediate member, and the intermediate member is fitted to the outer diameter of the wheel mounting flange; , Radially outside from this cylindrical part Since the brake disc is fixed to the mounting portion, it can be easily fixed even if a composite member such as ceramic reinforced aluminum is used for the brake disc, and the linear expansion coefficient Therefore, the design freedom of the brake rotor is increased regardless of the physical property values, and the weight can be reduced.

  A vehicle body mounting flange is integrally formed on the outer periphery, an outer member having a double row outer rolling surface formed on the inner periphery, a wheel mounting flange is integrally formed on one end, and the double row outer rolling is formed on the outer periphery. One inner rolling surface facing the running surface, a hub ring formed with a cylindrical small-diameter stepped portion extending in the axial direction from the inner rolling surface, and a small-diameter stepped portion of the hub wheel are press-fitted to the outer periphery. An inner member comprising an inner ring formed with the other inner rolling surface facing the double row outer rolling surface, and freely rollable between the respective rolling surfaces of the inner member and the outer member. In a wheel bearing device with a brake rotor, wherein the brake rotor has a thermal conductivity higher than that of the metal constituting the hub wheel. Intermediate member made of a high metal material and the intermediate member Consists of a brake disc made of a separate disc-shaped composite material, the intermediate member being detachably fixed to the wheel mounting flange of the hub wheel, and an axial direction from this base portion A cylindrical portion that extends and is fitted to the outer diameter of the wheel mounting flange via a predetermined guide clearance, and a mounting portion that extends radially outward from the cylindrical portion, and the brake disc is mounted on the mounting portion. It is detachably fixed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device with a brake rotor according to the present invention. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outboard side (left side in the drawing), and the side closer to the center is referred to as the inboard side (right side in the drawing).

The wheel bearing device 2 with a brake rotor is for a drive wheel, and has a so-called third generation configuration in which the hub wheel 1 and a double row rolling bearing are unitized.
The wheel bearing device 2 with a brake rotor has an outer member 4, an inner member 3, and double-row rolling elements (balls) 5, 5, and the outer member 4 is carbon 0.40 such as S53C. It is made of medium carbon steel containing 0.80 wt%, and integrally has a vehicle body attachment flange 4b for attachment to a vehicle body (not shown) on the outer periphery. Double rows of outer rolling surfaces 4a and 4a are formed on the inner periphery, and a hardened layer is formed with a surface hardness in the range of 58 to 64 HRC by induction hardening.

  On the other hand, the inner member 3 is formed with double-row inner rolling surfaces 1a and 6a facing the outer rolling surfaces 4a and 4a of the outer member 4 described above. Of these double-row inner rolling surfaces 1a, 6a, one inner rolling surface 1a is on the outer periphery of the hub wheel 1, and the other inner rolling surface 6a is on the outer periphery of the inner ring 6 press-fitted into the hub wheel 1, respectively. It is integrally formed. In this case, the inner member 3 refers to the hub wheel 1 and the inner ring 6.

  The hub wheel 1 is made of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and has a wheel mounting flange 7 for mounting a wheel (not shown) at an end on the outboard side. An inner rolling surface 1a and a cylindrical small-diameter step portion 1b extending in the axial direction from the inner rolling surface 1a are formed on the outer periphery. The inner ring 6 is press-fitted into the small-diameter step portion 1b, and an end portion of the small-diameter step portion 1b is plastically deformed in the radial direction to form a crimped portion 8. The inner ring 6 is fixed in the axial direction with respect to the hub wheel 1 by the caulking portion 8 to form a so-called self-retaining structure. As a result, it is not necessary to control the preload by tightening firmly with a nut or the like as in the prior art, so that the weight and size can be reduced and the strength and durability of the hub wheel 1 can be improved and long. The amount of preload can be maintained for a period.

  Here, an inner raceway surface 1a and a cylindrical small-diameter step portion 1b extending in the axial direction from the inner raceway surface 1a are formed on the hub wheel 1, and the inner ring 6 is press-fitted into the small-diameter step portion 1b. Although the so-called third generation structure has been illustrated, the present invention is not limited to this, and although not illustrated, a so-called first or second generation structure in which a pair of inner rings are press-fitted into the small-diameter step portion of the hub wheel may be used.

  Double row rolling elements 5 and 5 are accommodated between both rolling surfaces of the outer member 4 and the inner member 3, and are held by the cages 9 and 9 so as to be freely rollable. Further, seals 10 and 11 are attached to the end portion of the outer member 4 to prevent leakage of the lubricating grease sealed inside the bearing and intrusion of rainwater, dust and the like into the bearing from the outside.

  Further, the hub wheel 1 has a hardened layer with a surface hardness of 58 to 64 HRC by induction quenching from the seal land portion where the seal 10 on the outboard side is in sliding contact to the inner rolling surface 1a and the small diameter step portion 1b. Is formed. As a result, the seal land which is the base of the wheel mounting flange 7 not only has improved wear resistance, but also has sufficient mechanical strength against the rotational bending load applied to the wheel mounting flange 7. The durability of 1 is further improved. Note that the caulking portion 8 is an unquenched portion having a material surface hardness of 25 HRC or less after forging. Thereby, the workability when plastically deforming the caulking portion 8 is improved and the occurrence of cracks or the like during the processing is prevented, and the reliability of the quality is improved.

  A hub bolt 7 a for fixing the wheel in a circumferential direction is planted on the wheel mounting flange 7 in the hub wheel 1, and a cylindrical brake that supports the brake rotor 12 is provided on the outboard side of the wheel mounting flange 7. A wheel pilot portion 14 having a smaller diameter than the brake pilot portion 13 is integrally formed on the pilot portion 13 and further on the outboard side from the brake pilot portion 13.

  In the present embodiment, the brake rotor 12 includes an intermediate member 15 and a brake disc 16. The intermediate member 15 is a disc-shaped base portion 17 fixed to the wheel mounting flange 7 of the hub wheel 1, and extends axially from the base portion 17, and is fitted to the outer diameter of the wheel mounting flange 7 via a predetermined guide clearance. The cross section is formed of a cylindrical portion 18 to be joined and a mounting portion 19 extending radially outward from the cylindrical portion 18, and the cross section is formed in a substantially crank shape. On the other hand, the brake disc 16 is made of a composite material such as ceramic reinforced aluminum and is formed in a disc shape. The intermediate member 15 and the brake disc 16 are fastened by a plurality of bolts 20 fitted in the bolt holes 20a. In addition to guiding the intermediate member 15 by the outer diameter of the wheel mounting flange 7, for example, the intermediate member 15 may be guided by the brake pilot portion 13.

  The intermediate member 15 is made of a material having a high thermal conductivity such as an aluminum alloy, and the bolt holes 21 drilled in the circumferential direction of the base portion 17 are knurled. Thereby, it is possible to suppress the heat generated in the brake rotor 12 from being transmitted to the wheel mounting flange 7, and it is possible to easily fix the intermediate member 15 to the hub bolt 7a. By providing the intermediate member 15 with air-cooling fins (not shown), the heat dissipation can be further improved. The intermediate member 15 may be fixed to the wheel mounting flange 7 by press-fitting the bolt hole 21 into the hub bolt 7a without performing knurling.

  Here, since the wall thickness b1 of the cylindrical portion 18 in the intermediate member 15 is set larger than the wall thicknesses b2 and b3 of the base portion 17 and the attachment portion 19, the weight can be reduced without reducing the angular rigidity. Further, since the brake disk 16 is formed in a simple disk shape and is detachably fixed to the intermediate member 15 by the bolt 20, maintenance is facilitated and a composite member such as ceramic reinforced aluminum can be used. It can be fixed easily, and expensive composite materials can be minimized to prevent the cost from rising. Furthermore, the degree of freedom in design is increased regardless of physical property values such as the linear expansion coefficient, and the weight can be reduced.

FIG. 2 is a cross-sectional view showing a modification of the intermediate member 15 constituting the brake rotor 12. In addition, the same code | symbol is attached | subjected to the same site | part and the detailed description is abbreviate | omitted.
The intermediate member 22 is made of a light alloy such as an aluminum alloy, extends in the axial direction from the disk-shaped base portion 17, and is fitted to the outer diameter of the wheel mounting flange 7 via a predetermined guide clearance. The cylinder portion 23 and the mounting portion 19 extending radially outward from the cylinder portion 23 have a substantially crank shape in cross section. The cylindrical portion 23 is provided with perforations 23a intermittently in the circumferential direction, thereby further reducing the weight.

FIG. 3 is a front view showing a modified example of the intermediate member 15 in the same manner, and the same parts as those in the above-described embodiment are denoted by the same reference numerals and detailed description thereof is omitted.
The intermediate member 24 is made of a light alloy such as an aluminum alloy, and has a disk-like base portion 25 fixed to the wheel mounting flange 7 of the hub wheel 1, a cylindrical portion 18 extending in the axial direction from the base portion 25, and the cylindrical portion. And a mounting portion 26 extending radially outward from 18 and having a substantially crank-shaped cross section. The base 25 is provided with a recess 27 between the bolt holes 21. Further, the mounting portion 26 is also provided with a recess 28 between the bolt holes 20a, 20a. These recesses 27 and 28 further reduce the weight of the intermediate member 24. The recesses 27 and 28 may be provided on either side of the base portion 25 and the attachment portion 26, and the cylindrical portion 18 may be further provided with the above-described perforations 23a.

FIG. 4 is a front view showing a modified example of the intermediate member 24. The same parts as those in the above-described embodiment are denoted by the same reference numerals and detailed description thereof is omitted.
The intermediate member 29 is made of a light alloy such as an aluminum alloy, and includes a base portion 30 fixed to the wheel mounting flange 7 of the hub wheel 1, a cylindrical portion 18 extending in the axial direction from the base portion 30, and a radial direction from the cylindrical portion 18. It consists of the attachment part 31 extended outward, and the cross section is formed in the substantially crank shape. The base 30 is provided with a notch 32 between the bolt holes 21. The mounting portion 31 is also provided with a notch 33 between the bolt holes 20a, 20a. These notches 32 and 33 further reduce the weight of the intermediate member 29. Note that the notches 32 and 33 and the recesses 27 and 28 of the above-described embodiment (FIG. 3) may be appropriately combined, and the above-described perforations 23a may be further provided in the cylindrical portion 18.

  FIG. 5 is a longitudinal sectional view showing a second embodiment of the wheel bearing device with a brake rotor according to the present invention. In this embodiment, only the configuration of the brake rotor is different from that of the first embodiment described above, and the same parts, the same parts, or the parts having the same function are denoted by the same reference numerals and detailed description thereof will be given. Omitted.

  The hub wheel 1 ′ has a wheel mounting flange 7 integrally at an end portion on the outboard side, and a hub bolt 7 a ′ for fixing the wheel in the circumferential direction of the wheel mounting flange 7 is planted. . A wheel pilot portion 14 ′ is integrally formed on the outboard side of the wheel mounting flange 7.

In the present embodiment, the brake rotor 34 includes the intermediate member 35 and the brake disc 16 as in the above-described embodiment. The intermediate member 35 includes a cylindrical portion 36 that is fixed to the outer diameter of the wheel mounting flange 7 in the hub wheel 1 ′ by welding, and a mounting portion 37 that extends radially outward from the cylindrical portion 36. It is formed in an L shape.

  Here, the attachment portion 37 has a spire shape in cross section so that the wall thickness gradually decreases as the outer diameter is increased. Thereby, weight reduction can be achieved without reducing the rigidity of the intermediate member 35. Further, in the present embodiment, the brake pilot portion 13 of the hub wheel 1 and the base portions 17, 25, 30 of the intermediate members 15, 22, 24, 29 can be removed (see FIGS. 1 to 4). More lightweight and compact. The fixing means for the intermediate member 35 is not limited to welding, but the intermediate member 35 is fitted to the outer diameter of the wheel mounting flange 7 and the intermediate member 35 is caulked to the wheel mounting flange 7 by plastic deformation of the fitting portion. It may be fixed.

  FIG. 6 is a longitudinal sectional view showing a third embodiment of a wheel bearing device with a brake rotor according to the present invention. This embodiment is basically different from the first embodiment (FIG. 1) described above only in the configuration of the brake rotor, and other parts having the same functions, the same parts, or the same functions are denoted by the same reference numerals. Detailed description thereof is omitted.

  In the present embodiment, the brake rotor 38 includes an intermediate member 39 and a brake disc 16 '. The intermediate member 39 includes a disk-shaped base 40 fixed to the wheel mounting flange 7 of the hub wheel 1, a cylindrical portion 18 that extends in the axial direction from the base portion 40, and a mounting that extends radially outward from the cylindrical portion 18. It consists of the part 41, and the cross section is formed in the substantially crank shape. On the other hand, the brake disk 16 'is made of a composite material such as ceramic reinforced aluminum and is formed in a disc shape.

  The intermediate member 39 has a base 40 fastened to the wheel mounting flange 7 ′ via a plurality of bolts 42. On the other hand, the intermediate member 39 and the brake disc 16 'are fixed together by welding. Here, an annular recess 41 a is formed on the inboard side surface of the attachment portion 41 in the intermediate member 39. The recess 41a can reliably contact the brake disc 16 'at both edges of the mounting portion 41, can minimize the heat effect during welding, and can suppress thermal deformation. Angular rigidity is improved.

  FIG. 7 is a longitudinal sectional view showing a fourth embodiment of a wheel bearing device with a brake rotor according to the present invention. This embodiment is different from the above-described third embodiment (FIG. 6) only in the configuration of the brake rotor, and other parts that are the same, the same parts, or the same function are denoted by the same reference numerals and detailed. Description is omitted.

  In the present embodiment, the brake rotor 43 includes an intermediate member 44 and a brake disc 45. The intermediate member 44 is a disc-shaped base portion 40 fixed to the wheel mounting flange 7 ′ of the hub wheel 1, a cylindrical portion 18 extending in the axial direction from the base portion 40, and extends radially outward from the cylindrical portion 18. The cross section is formed into a substantially crank shape. On the other hand, the brake disk 45 is composed of a pair of disk-shaped disks 45a and 45b made of a composite material such as ceramic reinforced aluminum. Thereby, brake performance, such as a heat dissipation effect, can be improved.

  The intermediate member 44 and the brake disc 45 are integrally fixed by a plurality of bolts 47. Here, by setting the width dimension of the mounting portion 46 in the intermediate member 44 to a desired gap c of the brake disk 45, it can also serve as a spacer.

  The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example, and various modifications can be made without departing from the scope of the present invention. Of course, the scope of the present invention is indicated by the description of the scope of claims, and further, the equivalent meanings described in the scope of claims and all modifications within the scope of the scope of the present invention are included. Including.

  The wheel bearing device with a brake rotor according to the present invention has a wheel mounting flange integrally for a driving wheel, a driven wheel, and a rolling element irrespective of a ball or a tapered roller. Can be applied to a wheel bearing device with a brake rotor to which is fixed.

1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device with a brake rotor according to the present invention. It is a sectional view showing the modification of the intermediate member in a 1st embodiment same as the above. It is a front view which shows the other modification of the intermediate member in 1st Embodiment same as the above. It is a front view which shows the other modification of the intermediate member in 1st Embodiment same as the above. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus with a brake rotor which concerns on this invention. It is a longitudinal cross-sectional view which shows 3rd Embodiment of the wheel bearing apparatus with a brake rotor which concerns on this invention. It is a longitudinal cross-sectional view which shows 4th Embodiment of the wheel bearing apparatus with a brake rotor which concerns on this invention. It is a longitudinal cross-sectional view which shows the conventional bearing apparatus for wheels with a brake rotor.

Explanation of symbols

1, 1 '... hub wheel 1a, 6a ... inner rolling surface 1b ...・ Small diameter step 2 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Bearing bearing device 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 4 ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer member 4a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 4b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ Car body mounting flange 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 6 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 7, 7 ′ ・ ・ ・ ・ ・..... Wheel mounting flanges 7a, 7a '..... Hub bolt 8 ........ caulking Part 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 10, 11 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal 12, 34, 38, 43 ・Brake rotor 13 Brake pilot part 14, 14 '... Wheel pilot part 15 22, 22, 24, 29, 35, 39, 44 ..Intermediate member 16, 16 ′, 45... Brake disc 17, 25, 30, 40. ... Base parts 18, 23, 36 ... Cylindrical parts 19, 26, 31, 37, 41, 46 ... Installation parts 20, 42, 47 ... Bolts 20a, 21 ... Bolt holes 27, 28 ... ············································································································· 45b ... ... Disk 51 ... Outer member 51a ... Outer rolling surface 51b ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting flange 52 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 53 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Hub wheel 53a ... Small diameter step 54 ... Inner ring 54a ... Inside rolling surface 55 ..... Inner member 56 ..... Rolling element 57 ...・ Brake rotor b1, b2, b3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wall thickness c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Gap

Claims (7)

An outer member having a double row outer raceway formed on the inner periphery, a hub wheel integrally having a wheel mounting flange at one end and a small diameter step formed on the outer periphery, and a small diameter step of the hub wheel An inner member formed with at least one inner ring press-fitted into the portion, and formed with an inner rolling surface facing the outer rolling surface of the double row, and each of the inner member and the outer member. In a wheel bearing device with a brake rotor, comprising a double-row rolling element accommodated between the running surfaces so as to freely roll, and a brake rotor attached to the wheel mounting flange.
The brake rotor includes an intermediate member and a disc-shaped brake disc that is separate from the intermediate member, and the intermediate member is fitted to the outer diameter of the wheel mounting flange, and the cylinder And a brake rotor-equipped wheel bearing device, wherein the brake disc is fixed to the mounting portion.   The wheel for a brake rotor-equipped wheel according to claim 1, wherein the intermediate member has a disk-shaped base portion extending radially inward from the cylindrical portion, and the base portion is detachably fixed to the wheel mounting flange. Bearing device.   The wheel bearing device with a brake rotor according to claim 2, wherein a thickness of the cylindrical portion is set larger than a thickness of the base portion and the mounting portion.   The wheel bearing device with a brake rotor according to any one of claims 1 to 3, wherein the brake disk is detachably fixed to the intermediate member.   The wheel bearing device with a brake rotor according to any one of claims 1 to 4, wherein the intermediate member is provided with a plurality of perforations, recesses, or notches.   The wheel bearing device with a brake rotor according to any one of claims 1 to 5, wherein the intermediate member is formed of a metal material having a higher thermal conductivity than a metal constituting the hub wheel.   The wheel bearing device with a brake rotor according to any one of claims 1 to 6, wherein the brake disc is formed of a composite member.

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