JP2005289147A - Bearing device for wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel which is reduced in weight and size, and is improved in the strength of a hub wheel and durability under the condition of a rotary bending load. <P>SOLUTION: The bearing device 2 for a wheel is equipped with an outer member 4 with double row outer rolling surfaces 4a formed on its inner periphery, an inner member 3 which integrally has a plurality of radially extending wheel mounting arms 6 at the end of the outboard side and comprises one inside rolling surface 1a formed on the outer periphery, a hub wheel 1 on which a cylindrical small diameter step part 7 axially extending from the inside rolling surface 1a is formed, and an inner wheel 10 which is pressed in the small diameter step part 7 with the other inside rolling surface 10a formed on the outer periphery, and with double row rolling elements 5 accommodated between both rolling surfaces in a freely rolling way. The side face 17 of the outboard side of the wheel mounting arm 6 is formed tilting on the inboard side by a tilting angle α toward the end part relative to the vertical face. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wheel bearing device that rotatably supports a wheel of an automobile or the like with respect to a suspension device, and more particularly to a wheel bearing device that is lighter and more compact and has improved durability.

  In recent years, demands for improving fuel efficiency have been severe from the viewpoint of resource saving or pollution. In automobile parts, the weight reduction of wheel bearing devices has been attracting attention as a factor to meet such demands and has been strongly desired for a long time. In particular, among vehicles such as automobiles, light vehicles such as light four-wheel vehicles or small cars are not only cost-reduced, but demands for this weight reduction are increasing. There are various proposals related to wheel bearing devices that have been made lighter in the past. However, in the wheel bearing device that supports the wheel in a freely rotatable manner, reliability and durability contradicting this weight reduction in one aspect. Improving the performance is also an important factor.

  FIG. 6 shows an example of a wheel bearing device that is used in an automobile and is reduced in weight. This wheel bearing device has a typical structure used on the drive wheel side, and includes a hub wheel 51 and a double row rolling bearing 52 as a unit.

  The hub wheel 51 is formed by forging to form a hollow structure, and integrally includes a wheel mounting flange 53 for mounting a wheel (not shown), and one inner rolling surface 51a of the double row rolling bearing 52 on the outer periphery thereof. A cylindrical small diameter step portion 51b extending in the axial direction from the inner rolling surface 51a is formed, and a torque transmission spline 54 is formed on the inner periphery.

  A separate inner ring 55 in which the other inner rolling surface 55a of the double row rolling bearing 52 is formed on the outer periphery is press-fitted into the small diameter step portion 51b. The end portion of the small diameter step portion 51 b is plastically deformed radially outward to form a crimped portion 56, and the inner ring 55 is fixed to the hub wheel 51 in the axial direction by the crimped portion 56.

  On the other hand, the outer member 57 constituting the double-row rolling bearing 52 integrally has a vehicle body mounting flange 57b for fixing to the knuckle 58 constituting the suspension device, and the inner rolling surfaces 51a, 55a are arranged on the inner periphery. Double row outer rolling surfaces 57a and 57a are formed opposite to each other. As described above, the double row rolling bearing 52 includes the hub wheel 51, the inner ring 55, the outer member 57, and the double row rolling elements that are accommodated so as to roll freely between the rolling surfaces 51a, 57a, 55a, and 57a. 59, 59.

  In the hub wheel 51, hub bolts 53a are implanted at four equal locations around the wheel mounting flange 53, and the brake rotor 60 and the wheel are fastened. As shown in FIG. 7, the hub wheel 51 is formed with a bolt insertion hole 61 in which the hub bolt 53 a is fixed to the wheel mounting flange 53, and avoids the periphery of the bolt insertion hole 61. , An R-shaped notch 62 is formed on the outer periphery of the wheel mounting flange 53.

The notch 62 is formed so that the deepest portion 62 a is close to the string B connecting the center of the adjacent bolt insertion hole 61 on the inner diameter side of the pitch circle diameter A of the bolt insertion hole 61. Further, the wheel mounting flange 53 is formed with a thin portion 63 in which the thickness in the vicinity of the outer periphery of each bolt insertion hole 61 is reduced, and the inner peripheral side including the bolt insertion holes 61 is not reduced in thickness. The normal thick portion 64 is used so that sufficient bending rigidity can be obtained. This prevents a reduction in the bending rigidity of the wheel mounting flange 53 while reducing the weight.
JP 2003-94905 A

  However, in the hub wheel 51 of such a conventional wheel bearing device, the hub wheel 51 is reduced in weight and the bending rigidity of the wheel mounting flange 53 is prevented from being lowered, as shown in FIG. In addition, the corner portion 67 between the brake rotor 60 and the pilot portion 65 into which the wheel is inserted and the side surface 66 of the wheel mounting flange 53 is a portion where an alternating stress is generated due to a lateral turning or the like of the vehicle. As a result, tensile stress is repeatedly generated on the surface of the corner 67. Such tensile stress lowers the fatigue strength of the hub wheel 51, and particularly appears in such a hub wheel 51 that is slimmed down.

  The present invention has been made in view of such conventional problems, and provides a wheel bearing device that is light and compact, and has improved strength and durability of the hub wheel under the condition of rotational bending load. The purpose is to provide.

  In order to achieve such an object, the invention described in claim 1 of the present invention includes an outer member having a double row outer raceway formed on the inner periphery, and a wheel mounting flange at an end on the outboard side. A hub ring integrally formed with a cylindrical small-diameter stepped portion extending in the axial direction on the outer periphery, and an inner ring press-fitted into the small-diameter step portion of the hub ring, and the double row outer rolling on the outer periphery In the wheel bearing device, comprising: an inner member formed with an inner rolling surface facing the surface; and a double row rolling element that is slidably accommodated between the both rolling surfaces. A notch is formed between the hub bolt insertion holes, avoiding the periphery of the hub bolt insertion holes drilled on the circumference of the flange at equal intervals, from the pitch circle diameter of the hub bolt insertion holes, to the wheel mounting flange. The side of the outboard side is slightly toward the edge with respect to the vertical plane Employing the configuration is formed to be inclined to the inboard side.

  In this way, a notch is formed between the hub bolt insertion holes, avoiding the periphery of the hub bolt insertion holes perforated on the circumference of the wheel mounting flange, from the pitch circle diameter of the hub bolt insertion holes to the inner diameter side. At the same time, the side surface on the outboard side of the wheel mounting flange is slightly inclined toward the inboard side toward the end with respect to the vertical surface, so that the wheel mounting flange is deformed by tightening the hub bolt. By compressing the side surface into a vertical surface, a compressive stress is applied to the corner that is the base of the wheel mounting flange. Therefore, even if an alternating stress is generated at this corner due to a vehicle turning or the like, and a repeated bending moment is applied, and a repeated tensile stress is generated on the surface of the corner, the fatigue strength of the hub wheel does not decrease sufficiently. Durability can be maintained.

  Preferably, as in the invention described in claim 2, since the inclination angle is set to 5 minutes or less, it is possible to suppress the occurrence of tensile stress at the base portion on the inboard side of the wheel mounting flange, thereby reducing the fatigue strength. A decrease can be prevented.

  Further, in the invention according to claim 3, the wheel mounting flange is formed by notching a portion excluding the vicinity of the hub bolt insertion hole, and having a width substantially the same as the formation portion of the hub bolt insertion hole, and radiating from the annular base portion. Since the rib is formed so that the side surface on the inboard side of the wheel mounting flange gradually becomes thicker toward the base portion thereof, without damaging the rigidity of the hub wheel. Weight reduction can be achieved.

  According to a fourth aspect of the present invention, there is provided a brake pilot portion that extends toward the outboard side of the wheel mounting flange and guides the inner surface of the brake rotor to the hub wheel, and further outboards from the brake rotor pilot portion. A wheel pilot portion that extends to the side and guides the inner diameter surface of the wheel is formed, and at least the wheel pilot portion is provided with notches at a plurality of locations in the circumferential direction, and is intermittently formed in a protruding piece shape. Therefore, it is possible to reduce the weight without reducing the rigidity of the hub wheel.

  Preferably, as in the fifth aspect of the present invention, if the wheel pilot portion is disposed corresponding to the position of the hub bolt insertion hole, the rigidity of the hub wheel is further secured while reducing the weight. be able to.

  According to a sixth aspect of the present invention, the outer member integrally has an annular vehicle body mounting portion protruding outward, and a plurality of vehicle body mounting arms extending radially from the vehicle body mounting portion are formed. Bolt insertion holes that are fixed to the knuckles are drilled at the end portions of the vehicle body mounting arm, and the vehicle body mounting arm is cut out at portions other than the vicinity of the bolt insertion holes, Since it has substantially the same width and is formed so as to protrude radially from the vehicle body mounting portion, weight reduction can be achieved without impairing the rigidity of the outer member.

  According to the seventh aspect of the present invention, one inner rolling surface is formed on the outer periphery of the hub wheel, and the other inner rolling surface is formed on the outer periphery of one inner ring press-fitted into the small diameter step portion. In addition, a crimped portion is formed by plastically deforming the end portion of the small diameter step portion radially outward, and the inner ring is fixed in the axial direction with respect to the hub wheel by the crimped portion. The rigidity of the hub wheel can be increased, and the weight and size can be reduced. Moreover, since it is not necessary to control the preload amount by tightening the inner ring firmly with a nut or the like as in the prior art, it is possible to simplify the incorporation into the vehicle and maintain the preload amount for a long time. In addition, the number of parts can be greatly reduced, and in combination with the improvement of incorporation, cost reduction and further reduction in weight and compactness can be achieved.

  The wheel bearing device according to the present invention has an outer member in which a double row outer rolling surface is formed on the inner periphery, and a wheel mounting flange at the end on the outboard side, and the outer periphery in the axial direction. A hub wheel formed with an extending cylindrical small-diameter stepped portion, and at least one inner ring press-fitted into the small-diameter stepped portion of the hub wheel, the outer periphery of the double-row facing the outer rolling surface of the double-row In a wheel bearing device comprising an inner member in which an inner rolling surface is formed and a double row rolling element that is accommodated so as to roll between both rolling surfaces, the circumference of the wheel mounting flange, etc. A notch is formed between the hub bolt insertion holes, avoiding the periphery of the hub bolt insertion hole formed in the arrangement, from the pitch circle diameter of the hub bolt insertion hole to the inner diameter side, and on the outboard side of the wheel mounting flange. Sides slightly indented towards the edge with respect to the vertical plane Since the wheel mounting flange is deformed by tightening the hub bolt and the side surface is corrected to a vertical surface, compressive stress is applied to the corner that is the base of the wheel mounting flange. Is done. Therefore, even if alternating stress is generated at the corners due to the vehicle turning or the like and repeated bending moments are applied, and repeated tensile stresses are generated on the surface of the corners, the fatigue strength of the hub wheel does not decrease sufficiently. Durability can be maintained.

  An outer member having a double row outer rolling surface formed on the inner periphery, and a wheel mounting flange integrally formed on the end on the outboard side, and one of the outer members facing the double row outer rolling surface on the outer periphery. A hub ring formed with an inner rolling surface and a cylindrical small-diameter step portion extending in an axial direction from the inner rolling surface, and press-fitted into the small-diameter step portion of the hub ring, and the double row outer rolling A wheel bearing device comprising: an inner member comprising an inner ring on which the other inner rolling surface facing the surface is formed; and a double row rolling element that is movably accommodated between the both rolling surfaces. In the above, a notch is formed between the hub bolt insertion holes, avoiding the periphery of the hub bolt insertion holes drilled at equal circumferences of the wheel mounting flanges, from the pitch circle diameter of the hub bolt insertion holes to the inner diameter side. The side surface of the wheel mounting flange on the outboard side is the end with respect to the vertical surface. Towards it is formed to be inclined slightly inboard side.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a longitudinal sectional view showing an embodiment of a wheel bearing device according to the present invention, FIG. 2 is a right side view of FIG. 1, and FIG. 3 is a right side view of a hub wheel in FIG. 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).

  This wheel bearing device is a wheel bearing device that rotatably supports a driven wheel. The wheel bearing device 2 is configured to roll between an inner member 3, an outer member 4, and both members 3, 4. It has double-row rolling elements (balls) 5 and 5 accommodated in a freely movable manner. Here, the inner member 3 refers to the hub wheel 1 and the inner ring 10 press-fitted into the hub wheel 1.

  The hub wheel 1 integrally has a wheel mounting flange 6 (hereinafter referred to as a wheel mounting arm) that is divided into four radially extending at an end on the outer board side of the outer periphery. Hub bolts 6a for fastening the wheels are planted at the equidistant positions. The wheel mounting arm 6 is cut out at a portion other than the vicinity of the hub bolt insertion hole 6b and has a width substantially the same as the portion where each hub bolt insertion hole 6b is formed, and projects radially from an annular base, that is, a brake pilot portion 14 described later. It is formed to do. Furthermore, a rib 6c is formed on the side surface of the wheel mounting arm 6 on the inboard side so as to gradually increase in thickness toward the base portion. Thereby, weight reduction can be achieved without impairing the rigidity of the hub wheel 1.

  In the present embodiment, the wheel mounting formed by notching the portion except the vicinity of the hub bolt insertion hole 6b and having a width substantially the same as that of each hub bolt insertion hole 6b and projecting radially from the annular base portion. Although the arm 6 has been exemplified, the present invention is not limited thereto, and a notch is formed between the hub bolt insertion holes so as to avoid the periphery of the hub bolt insertion hole and deeper than the pitch circle diameter of the hub bolt insertion hole to the inner diameter side, as in the past. It may be something like a wheel mounting flange.

  Further, on the outer periphery of the wheel mounting arm 6 of the hub wheel 1 on the inboard side, an inner rolling surface 1a and a cylindrical small diameter step portion 7 extending in the axial direction from the inner rolling surface 1a are formed. An inner ring 10 is press-fitted into the stepped portion 7 through a predetermined shimoshiro. And the crimping part 8 is formed by plastically deforming the edge part of the small diameter step part 7 to radial direction outward. The inner ring 10 is fixed in the axial direction with respect to the hub wheel 1 by the caulking portion 8 to form a so-called third generation self-retained structure. Therefore, the rigidity of the hub wheel 1 can be increased, and the weight and size can be reduced. Moreover, since it is not necessary to control the preload amount by tightening the inner ring firmly with a nut or the like as in the prior art, it is possible to simplify the incorporation into the vehicle and maintain the preload amount for a long time. In addition, the number of parts can be greatly reduced, and in combination with the improvement of incorporation, low cost, light weight and compactness can be achieved. The wheel bearing according to the present invention is not limited to the third generation structure, and may be a so-called second generation structure in which a pair of inner rings are press-fitted into a hub ring, for example.

  Double rows of outer rolling surfaces 4a, 4a are formed on the inner periphery of the outer member 4, and one of the inner rolling surfaces of the inner member 3 facing the outer rolling surfaces 4a, 4a. The surface 1 a is formed on the hub wheel 1, and the other inner rolling surface 10 a is formed on the outer periphery of the inner ring 10. Double-row rolling elements 5 and 5 are accommodated between these rolling surfaces 4a, 1a and 4a and 10a, and these double-row rolling elements 5 and 5 are held by a cage 9 so as to be freely rollable.

  A seal 11 is attached to the end of the outer member 4 on the outboard side, and the annular space between the outer member 4 and the inner member 3 is sealed. On the other hand, a cup-shaped seal cap (not shown) is attached to the end of the outer member 4 on the inboard side, and closes the opening of the outer member 4. The seal 11 and the seal cap prevent leakage of the lubricating grease sealed inside the bearing and intrusion of rainwater and dust from the outside into the bearing.

  Further, the outer member 4 integrally has an annular vehicle body mounting portion 4b protruding outward, and four vehicle body mounting arms 12 extending radially from the vehicle body mounting portion 4b are formed. Bolt insertion holes 13 are formed in the end portions. The vehicle body mounting arm 12 is formed so as to protrude radially from the vehicle body mounting portion 4b with a width substantially the same as the portion where each bolt insertion hole 13 is formed, by cutting out a portion other than the vicinity of the bolt insertion hole 13. . And it fixes to the knuckle (not shown) which comprises a suspension apparatus with the knuckle bolt (not shown) penetrated to the bolt insertion hole 13. FIG. Further, a cylindrical knuckle pilot portion 4c extending in the axial direction from the vehicle body attachment portion 4b is formed at an end portion on the inboard side of the outer member 4, and the knuckle is fitted on the outer diameter surface of the knuckle pilot portion 4c. Combined.

  Thus, the outer member 4 has an annular vehicle body mounting portion 4b protruding to the outer periphery, and the vehicle body mounting arms 12 extending radially from the vehicle body mounting portion 4b are formed with substantially the same width. Weight reduction can be achieved without impairing the rigidity of the side member 4. The knuckle pilot portion 4c may be provided with notches at a plurality of locations in the circumferential direction, and may be intermittently formed in a protruding piece shape. Thereby, weight reduction can be achieved without reducing the rigidity of the outer member 4.

  Further, in the present embodiment, the wheel mounting arm 6 is cut out at a portion other than the vicinity of the hub bolt insertion hole 6b, and only the formation portion of each hub bolt insertion hole 6b protrudes from the annular base portion to the outer diameter side with substantially the same width. Thus, when the outer member 4 is fastened to the knuckle, the knuckle bolt can be easily fastened with a tool without being obstructed by the wheel mounting arm 6, and the assembly work can be performed. It can be simplified.

  The hub wheel 1 is formed of medium carbon steel containing carbon of 0.40 to 0.80 wt% such as S53C, and the surface hardness is increased by induction hardening on the inboard side base portion and the small diameter step portion 7 of the wheel mounting arm 6. It is cured in the range of 54 to 64 HRC. The caulking portion 8 is an unquenched portion having a material surface hardness of 24 HRC or less after forging. As a result, the rigidity of the hub wheel 1 is improved, and fretting wear on the fitting surface with the inner ring 10 can be prevented, and the durability of the hub wheel 1 is improved. In addition, the workability when plastically deforming the caulking portion 8 is improved, and the occurrence of cracks and the like during processing is prevented, and the reliability of the quality is improved.

  Similarly to the hub wheel 1, the outer member 4 is formed of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the surface of the double row outer rolling surfaces 4a and 4a is induction hardened. Hardening is performed in the range of 54 to 64 HRC. On the other hand, the inner ring 10 is made of a high carbon chrome bearing steel such as SUJ2, and is hardened in the range of 54 to 64 HRC to the core portion by quenching. In addition, although the double row angular contact ball bearing which used the rolling elements 5 and 5 as a ball | bowl was illustrated here, the double row tapered roller bearing which uses a tapered roller for a rolling element may be sufficient not only in this.

  In this embodiment, as shown in FIG. 1, a cylindrical brake pilot portion 14 extending toward the outboard side is formed at the base portion of the wheel mounting arm 6 of the hub wheel 1 to guide an inner diameter surface of a brake rotor (not shown). ing. Further, a wheel pilot portion 15 is formed extending further from the brake pilot portion 14. The wheel pilot portion 15 guides an inner diameter surface of a wheel (not shown) mounted on the brake rotor so as to be slightly smaller in diameter than the brake pilot portion 14. And the notch is provided in the several places of the circumferential direction, and it is intermittently formed in the shape of a protrusion. Here, the intermittent wheel pilot portion 15 is formed corresponding to the position of the wheel mounting arm 6. Thereby, weight reduction can be achieved without reducing the rigidity of the hub wheel 1.

  Such a wheel pilot portion 15 may be a machined wheel 19 such as an aluminum wheel as shown in FIG. 4, or a wheel 20 formed by pressing a steel plate as shown in FIG. good. Thereby, it can mount | wear with high precision and simply, without producing fear of eccentricity.

  On the other hand, in FIGS. 4 and 5, since the brake pilot portion 14 is continuous over the entire circumference, not only the brake rotor 18 in the disc brake but also a brake drum (not shown) in the drum brake. Similarly, it can be mounted with high accuracy without causing the risk of eccentricity, and the occurrence of brake vibration can be suppressed. Here, if the brake pilot portion 14 is also of a split type like the wheel pilot portion 15, further weight reduction can be achieved.

  In the present embodiment, as shown in FIG. 1, arc stealing is provided at the wheel mounting arm 6 of the hub wheel 1 and the corner 16 of the brake pilot portion 15. Thereby, it is possible to easily prevent the brake rotor from interfering with the corner portion 16. Further, the side surface 17 on the outboard side is formed so as to be slightly inclined toward the inboard side from the corner portion 16 toward the end portion (radially outward) with respect to the vertical surface. Thus, when the brake rotor and the wheel are fastened to the hub wheel 1 by the hub bolt 6a, the wheel mounting arm 6 itself is deformed to the outboard side and is in close contact with the side surface of the brake rotor. In the present embodiment, an arc-shaped theft is provided at the corner 16, but this stealing is not necessarily provided.

  The wheel mounting arm 6 that was initially inclined to the inboard side is deformed by tightening the hub bolt 6a, and its side surface 17 is corrected to a vertical surface, whereby a compressive stress is applied to the corner 16 that is the base of the wheel mounting arm 6. Will be granted. Therefore, even if an alternating stress is generated at the corner 16 due to the vehicle turning or the like, and a repeated bending moment is applied, and the tensile stress is repeatedly generated on the surface of the corner 16, the fatigue strength of the hub wheel 1 is lowered. And sufficient durability can be maintained. Although the inclination angle α of the wheel mounting arm 6 is appropriately changed depending on the size of the hub wheel 1, it is preferably 5 minutes or less. This is because if the inclination angle α exceeds 5 minutes, an excessive tensile stress may be generated on the inboard side of the base of the wheel mounting arm 6 to reduce the fatigue strength.

  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 according to the present invention can be applied to an inner ring rotating type wheel bearing device of any structure such as a driving wheel, a driven wheel, or a rolling element having a ball, a tapered roller or the like.

It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. It is a right view of FIG. It is a right view of the hub wheel in FIG. It is a longitudinal cross-sectional view which shows the state which mounted | wore the brake rotor and the wheel with the wheel bearing apparatus which concerns on this invention. Same as above It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus. It is a front view which shows the conventional hub wheel.

Explanation of symbols

1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 1a, 10a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner rolling surface 2 ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel bearing device 3 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner member 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Outer member 4a ·········· Outside rolling surface 4b・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Knuckle pilot 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling element 6・ ・ Wheel mounting arm 6a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt 6b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub bolt insertion hole 6c ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rib 7 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter step 8 ・ ・ ・ ・ ・ ・ ・ ・··········································· 9・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal 12 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Car body mounting arm 13 .... Bolt insertion hole 14 ... Brake pilot part 15 ... Wheel pilot part 16 ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Corner 17 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Side 18 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ Brake rotor 19 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Machined wheel 20 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Pressed wheel 51 ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheels 51a, 55a ・ ・ ・ ・ ・ ・... Inner rolling surface 51b ... Small diameter step 52 ... Double row rolling bearing 53 ..... Wheel mounting flange 53a ..... hub bolt 54 ...・ ・ Spline 55 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inner ring 56 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Clamping section 57 ・ ・ ・ ・ ・ ・ ・ ・... Outer member 57a ... Outer rolling surface 57b ... 58 ... knuckle 59 ... rolling element 60 ... .... Brake rotor 61 ... Bolt insertion hole 62 ...・ ・ ・ ・ ・ ・ ・ ・ ・ Notch 63 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Thin wall 64 ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ Thick part 65 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Pilot part 66 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Side 67 ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Corner A ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Pitch circle diameter B ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・・ String α connecting the center of adjacent bolt insertion holes ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Inclination angle

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 the end on the outboard side and having a cylindrical small-diameter step portion extending in the axial direction on the outer periphery, and at least one press-fitted into the small-diameter step portion of the hub wheel An inner member formed of an inner ring, and an inner member in which a double-row inner rolling surface facing the double-row outer rolling surface is formed on the outer periphery;
In a wheel bearing device comprising: a double-row rolling element accommodated between the rolling surfaces so as to be freely rollable;
A notch is formed between the hub bolt insertion holes, avoiding the periphery of the hub bolt insertion holes perforated at equal circumferences of the wheel mounting flanges, from the pitch circle diameter of the hub bolt insertion holes to the inner diameter side. A wheel bearing device, wherein a side surface of the wheel mounting flange on the outboard side is formed to be slightly inclined toward the inboard side toward the end with respect to the vertical surface.   The wheel bearing device according to claim 1, wherein the inclination angle is set to 5 minutes or less.   The wheel mounting flange is formed so as to project radially from an annular base portion with a width substantially the same as the formation portion of the hub bolt insertion hole by cutting out a portion except the vicinity of the hub bolt insertion hole. The wheel bearing device according to claim 1 or 2, wherein a rib is formed so that a side surface on an inboard side of the wheel mounting flange is gradually thickened toward a base portion thereof.   A brake pilot portion that extends toward the outboard side from the wheel mounting flange and guides the inner diameter surface of the brake rotor to the hub wheel, and a wheel that extends further from the brake pilot portion to the outboard side and guides the inner diameter surface of the wheel The wheel part according to any one of claims 1 to 3, wherein a pilot part is formed, and at least the wheel pilot part is provided with notches at a plurality of positions in a circumferential direction, and is formed intermittently in a protruding piece shape. Bearing device.   The wheel bearing device according to claim 4, wherein the wheel pilot portion is disposed corresponding to a position of the hub bolt insertion hole.   The outer member integrally has an annular vehicle body mounting portion projecting to the outer periphery, and a plurality of vehicle body mounting arms extending radially from the vehicle body mounting portion are formed, and fixed to the knuckles at the ends of the vehicle body mounting arms, respectively. A bolt insertion hole to be drilled, and the vehicle body mounting arm is cut out at a portion except the vicinity of the bolt insertion hole, and has a width substantially the same as a portion where the bolt insertion hole is formed. The wheel bearing device according to any one of claims 1 to 5, wherein the wheel bearing device is formed so as to protrude radially.   One inner rolling surface is formed on the outer periphery of the hub wheel, the other inner rolling surface is formed on the outer periphery of one inner ring press-fitted into the small diameter step portion, and the end of the small diameter step portion is The wheel bearing according to claim 1, wherein a caulking portion is formed by plastic deformation radially outward, and the inner ring is fixed in an axial direction with respect to the hub wheel by the caulking portion. apparatus.

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