JP2007303653A - 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, improving reliability by improving strength and durability and by simultaneously solving the contrary problem such as weight reduction, size reduction and high rigidity of the device. <P>SOLUTION: This bearing device for the wheel with the brake rotor has rolling bodies of double rows, and fixes inner races 5 and 6 by rocking caulking, and installs the brake rotor R on a wheel installing flange 3. The outer side rolling body is a ball 9, and the inner side rolling body is a conical roller 10. A basic rated load of an inner side conical roller 10 row is set larger than a basic rated load of an outer side ball 9 row. Since a run-out width of a side surface Rf of the brake rotor R is regulated in a standard value in a state of rotatingly driving an outer member 4 as a reference, rigidity of an inner side rolling body row part is enhanced, and the service life can be lengthened, and the reliability can be improved by preventing vibration and partial abrasion by surface run-out of the brake rotor. <P>COPYRIGHT: (C)2008,JPO&INPIT

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, and in particular, while reducing the weight and increasing the rigidity, restricting the runout of the brake rotor and improving the reliability. The present invention relates to a wheel bearing device with a brake rotor.

  2. Description of the Related Art Conventionally, a wheel bearing device for supporting a wheel of an automobile or the like is such that a hub wheel for mounting a wheel is rotatably supported via a rolling bearing, and there are a drive wheel and a driven wheel. For structural reasons, an inner ring rotation method is generally used for driving wheels, and an inner ring rotation method and an outer ring rotation method are generally used for driven wheels. As the wheel bearing device, a double-row angular ball bearing having a desired bearing rigidity, exhibiting durability against misalignment, and having a small rotational torque from the viewpoint of improving fuel efficiency is often used. On the other hand, double row tapered roller bearings are used in vehicles such as off-road cars and trucks that have a heavy vehicle body weight.

  Further, the wheel bearing device has a structure called a first generation in which a wheel bearing composed of a double row angular ball bearing or the like is fitted between a knuckle and a hub wheel constituting a suspension device. Second generation structure in which body mounting flange or wheel mounting flange is formed directly on the outer periphery of the member, third generation structure in which one inner rolling surface is directly formed on the outer periphery of the hub wheel, or hub wheel, etc. It is roughly classified into a fourth generation structure in which the inner rolling surface is directly formed on the outer periphery of the outer joint member of the speed universal joint.

  The wheel bearing device shown in FIG. 6 has a fourth generation structure that is lightweight and compact, and includes a hub wheel 50, a double row rolling bearing 51, and a constant velocity universal joint 52 that are unitized. The double row rolling bearing 51 includes an outer member 53, an inner member 54, and a plurality of balls 55 and tapered rollers 56 accommodated between the two members. In the following description, the side closer to the outer side of the vehicle in a state assembled to the vehicle is referred to as the outer side (left side in the drawing), and the side closer to the center is referred to as the inner side (right side in the drawing).

  The outer member 53 integrally has a vehicle body mounting flange 53c attached to a knuckle constituting a suspension device (not shown) on the outer periphery, and double row outer rolling surfaces 53a and 53b are formed on the inner periphery. Here, the diameter of the outer-side outer rolling surface 53a is set to be smaller than the diameter of the inner-side outer rolling surface 53b. On the other hand, the inner member 54 includes a hub wheel 50, an outer joint member 58, which will be described later, integrally formed with the hub wheel 50, and a separate inner ring 57 press-fitted into the outer joint member 58. Yes.

  The hub wheel 50 integrally has a wheel mounting flange 50b for mounting a wheel (not shown) at one end, and the outer side outer rolling surface 53a of the double row outer rolling surfaces 53a and 53b on the outer periphery. The inner race surface 50a is formed directly on the inner ring 57, and the inner race surface 57a on the outer circumference of the inner ring 57 is opposed to the inner race surface 53b on the inner side of the double row outer race surfaces 53a, 53b. Is formed.

  The constant velocity universal joint 52 has an outer joint member 58 composed of a cup-shaped mouth portion 59 and a shoulder portion 60 that forms the bottom of the mouth portion 59, and the outer periphery of the outer joint member 58 has a curved shape. A track groove 58a is formed. The inner ring 57 is press-fitted into the outer diameter of the mouse portion 59 and is fixed in the axial direction by a retaining ring 61.

  A plurality of balls 55 are accommodated between the outer rolling surfaces of the outer member 53 and the inner member 54, and a plurality of tapered rollers 56 are accommodated between the inner rolling surfaces. Of the 55 rows and the 56 tapered rollers, the pitch circle diameter of the 55 outer balls is set smaller than the pitch circle diameter of the 56 inner tapered rollers. As a result, the basic rated load of the inner side rolling element row part to which a larger load is applied than the outer side rolling element row part is made larger than the basic rated load of the outer side rolling element row part. The lifetime of the row portions can be made substantially the same, and a design without waste can be made possible (see, for example, Patent Document 1).

  However, in such a wheel bearing device, since the inner ring 57 is fixed to the mouth portion 59 of the outer joint member 58, it is surely made compact in the axial direction. Not only does the outer diameter itself become large and hinders weight reduction, but it is not preferable due to a design change of peripheral parts such as a knuckle. As a solution to such a problem, a wheel bearing device as shown in FIG. 7 is known.

  This wheel bearing device has a vehicle body mounting flange 62c integrally attached to a knuckle (not shown) on the outer periphery, and an outer member having double-row outer rolling surfaces 62a and 62b formed on the inner periphery. 62 and a wheel mounting flange 63 for mounting a wheel (not shown) at one end thereof are integrally formed and opposed to the outer-side outer rolling surface 62a of the double-row outer rolling surfaces 62a and 62b on the outer periphery. The inner raceway 64a, the hub wheel 64 formed with the small diameter step portion 64b extending in the axial direction from the inner raceway surface 64a, and the small diameter step portion 64b of the hub wheel 64, and are fitted on the outer side of the double row. Of the rolling surfaces 62a and 62b, an inner member 66 comprising an inner ring 65 formed with an inner rolling surface 65a facing the inner outer rolling surface 62b, and a double row accommodated between these rolling surfaces. Balls 67, 68 and these It is composed of a double row angular contact ball bearing having a retainer 69, 70 for holding the balls 67, 68 rollably.

  The inner ring 65 is fixed in the axial direction by a caulking portion 64c formed by plastically deforming the small-diameter stepped portion 64b of the hub wheel 64 radially outward. Seals 71 and 72 are attached to the opening portion of the annular space formed between the outer member 62 and the inner member 66, leakage of the lubricating grease sealed inside the bearing, and rainwater entering the bearing from the outside. And dust are prevented from entering.

Here, the pitch circle diameter D1 of the 67 rows of balls on the outer side is set larger than the pitch circle diameter D2 of the 68 rows of balls on the inner side. Along with this, the inner rolling surface 64a of the hub wheel 64 is expanded in diameter than the inner rolling surface 65a of the inner ring 65, and the outer rolling surface 62a on the outer side of the outer member 62 is also rolled on the inner side. The diameter is larger than that of the surface 62b. The outer side balls 67 are accommodated more than the inner side balls 68. As described above, by setting the pitch circle diameters D1 and D2 to D1> D2, the rigidity is improved not only when the vehicle is stationary but also when turning, and the life of the wheel bearing device can be extended. (For example, refer to Patent Document 2).
JP 11-91308 A JP 2004-108449 A

  In such a conventional wheel bearing device, the pitch circle diameter D1 of the outer row of the balls 67 is set larger than the pitch circle diameter D2 of the inner row of the balls 68. The running surface 64 a is larger in diameter than the inner rolling surface 65 a of the inner ring 65. As a result, the rigidity of the outer bearing row can be improved while avoiding an increase in size of the device, and the life of the wheel bearing device can be extended. However, the loads applied to the inner and outer rows are different from each other, and the load applied to the inner rolling element row part is generally larger than the load applied to the outer rolling element row part. is there. In this case, in this conventional wheel bearing device, the basic load rating of the inner side rolling element row portion is smaller than the basic load rating of the outer side rolling element row portion, resulting in a shorter life.

  SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and simultaneously solves the conflicting problems of lightweight, compact and high rigidity of the device, and also has a brake rotor wheel bearing with improved strength and durability. The object is to provide a device.

  Another object of the present invention is to provide a highly reliable wheel bearing device with a brake rotor by preventing vibration and uneven wear due to surface vibration of the brake rotor.

  In order to achieve such an object, the invention according to claim 1 of the present invention has a vehicle body mounting flange integrally attached to the suspension on the outer periphery, and a double row outer rolling surface is formed on the inner periphery. The outer member and a wheel mounting flange for attaching the wheel to one end are integrated, a hub wheel having a small-diameter step portion formed on the outer periphery, and press-fitted into the small-diameter step portion of the hub wheel. An inner member made of at least one inner ring formed with an inner rolling surface facing the double row outer rolling surface, and accommodated in a freely rollable manner between both rolling surfaces of the inner member and the outer member. The inner ring is fixed to the hub wheel in the axial direction by a crimping portion formed by plastically deforming an end of the small diameter step portion radially outward. A brake rotor having a brake rotor attached to the wheel mounting flange In the rolling wheel bearing device, the outer side rolling element of the double row rolling elements is a ball and the inner side rolling element is a tapered roller, and the basic rated load of the inner side tapered roller array is the outer side rolling element. Is set to be larger than the basic load rating of the ball row, and the runout width of the side surface of the brake rotor is regulated within a standard value in a state of being rotationally driven with reference to the outer member.

  As described above, the wheel bearing device with a brake rotor having the second or third generation structure is provided with the double row rolling elements, the inner ring is fixed by swing caulking, and the brake rotor is mounted on the wheel mounting flange of the hub ring. In the double row rolling element, the outer side rolling element is a ball and the inner side rolling element is a tapered roller. The basic rated load of the inner side tapered roller line is the basic rated load of the outer side ball line. And the runout width of the side surface of the brake rotor is regulated within the standard value in a state where it is rotationally driven with respect to the outer member, so that the rigidity of the rolling element row portion on the inner side is high. In addition, even if the load applied to the inner rolling element row portion is larger than the load applied to the outer rolling element row portion, the life can be made the same or longer. Therefore, it is possible to realize a lean design, improve the strength and durability, and eliminate the need for troublesome adjustment of the side of the brake rotor in an automobile assembly plant, thereby improving the reliability of the brake rotor. A bearing device for an attached wheel can be provided.

  Further, as in the invention described in claim 2, the pitch circle diameter of the inner side tapered roller row and the pitch circle diameter of the outer side ball row may be set to be the same. As described above, the pitch circle diameter of the inner side tapered roller row may be set smaller than the pitch circle diameter of the outer side ball row. In this case, the outer diameter on the inner side of the outer member can be set to a small diameter, the knuckle size can be reduced without reducing the basic load rating of the inner rolling element row, and the device can be made lighter and more compact. be able to.

  If the pair of inner rings are press-fitted into the small-diameter step portion of the hub wheel and the inner diameters of these inner rings are set to be the same, the small-diameter step portion of the hub ring is straightened. Therefore, the workability of the hub wheel can be improved.

  Further, as in the invention according to claim 5, the outer side inner rolling surface is directly formed on the outer periphery of the hub wheel, and the small diameter step portion is formed on the inner side from the inner rolling surface, If the inner ring on the inner side is press-fitted into the small-diameter step portion through a predetermined scissors, the device can be further reduced in weight and size.

  A wheel bearing device with a brake rotor according to the present invention has a vehicle body mounting flange integrally attached to the suspension on the outer periphery, and an outer member having a double row outer raceway formed on the inner periphery, A hub wheel integrally having a wheel mounting flange for mounting a wheel at one end, a small diameter stepped portion formed on the outer periphery, and press-fitted into the small diameter stepped portion of the hub wheel, and the double row outer rolling on the outer periphery An inner member composed of at least one inner ring formed with an inner rolling surface facing the surface, and a double row rolling member accommodated between the rolling surfaces of the inner member and the outer member. The inner ring is fixed in the axial direction with respect to the hub wheel by a caulking portion formed by plastically deforming an end of the small diameter step portion radially outward. Wheel with brake rotor fitted with brake rotor In the bearing device, of the double row rolling elements, the outer side rolling element is a ball and the inner side rolling element is a tapered roller, and the basic rated load of the inner side tapered roller row is the outer side ball row. And the runout width of the side surface of the brake rotor is regulated within a standard value in a state of being rotationally driven with respect to the outer member as a reference. Even when the rigidity of the row portion is increased and the load applied to the inner-side rolling element row portion is larger than the load applied to the outer-side rolling element row portion, the life can be made the same or more. Therefore, it is possible to realize a lean design, improve the strength and durability, and eliminate the need for troublesome adjustment of the side of the brake rotor in an automobile assembly plant, thereby improving the reliability of the brake rotor. A bearing device for an attached wheel can be provided.

  A hub wheel having a wheel mounting flange for mounting a wheel at one end and a small diameter step portion extending in the axial direction from the wheel mounting flange is formed on the outer periphery, and the hub wheel is press-fitted into the small diameter step portion of the hub wheel. A wheel bearing device comprising a wheel bearing, and the wheel bearing integrally has a vehicle body mounting flange for mounting on a suspension device on the outer periphery, and a double row outer rolling surface is formed on the inner periphery. An outer member formed on the outer periphery, a pair of inner rings each having an inner rolling surface opposed to the outer rolling surface of the double row on the outer periphery, and a double row of rollers that are rotatably accommodated between the rolling surfaces. A rolling element, and the inner ring is axially oriented with respect to the hub ring in a state where a predetermined bearing preload is applied by a crimping portion formed by plastically deforming an end portion of the small-diameter stepped portion radially outward. And the brake rotor is mounted on the wheel mounting flange. In the wheel bearing device with a brake rotor, the outer side rolling element of the double row rolling elements is a ball and the inner side rolling element is a tapered roller, and the basic rated load of the inner side tapered roller array is The outer side ball train is set to be larger than the basic rated load, and the swing width of the side surface of the brake rotor is regulated within a standard value in a state of being rotationally driven with respect to the outer member. .

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, and FIG. 2 is a schematic view showing a measurement state of surface runout of a side surface of the brake rotor in FIG. .

  This wheel bearing device with a brake rotor is for a driven wheel called a second generation, and includes a hub wheel 1 and a wheel bearing 2 fixed to the hub wheel 1. The hub wheel 1 integrally has a wheel mounting flange 3 for mounting a wheel (not shown) at one end portion on the outer side, a wheel pilot 1d is formed at the center of the side surface 3b on the outer side, and the wheel Hub bolts 3a are implanted in the mounting flange 3 at equal intervals in the circumferential direction. The brake rotor R is fixed to the outer side surface 3b of the wheel mounting flange 3 by hub bolts 3a. A small-diameter step portion 1b extending in the axial direction from the base portion of the wheel mounting flange 3 via the shoulder portion 1a is formed.

  The wheel bearing 2 is press-fitted into the small-diameter step portion 1b through a predetermined shimiro while being abutted against the shoulder portion 1a of the hub wheel 1, and is formed by plastically deforming the end portion of the small-diameter step portion 1b. It is fixed in the axial direction by the fastening portion 1c. The hub wheel 1 is formed of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the surface hardness is set to a range of 58 to 64 HRC by induction hardening from the shoulder portion 1a to the small diameter step portion 1b. It has been cured. The caulking portion 1c is kept in the surface hardness after forging. Thereby, it has sufficient mechanical strength with respect to the rotational bending load applied to the wheel mounting flange 3, and the fretting resistance of the small-diameter step portion 1b that becomes the fitting portion of the wheel bearing 2 is improved. The plastic working of the caulking portion 1c can be smoothly performed while preventing generation of minute cracks and the like.

  The wheel bearing 2 integrally has a vehicle body mounting flange 4c to be attached to a knuckle (not shown) constituting a suspension device on the outer periphery, and double row outer rolling surfaces 4a and 4b are formed on the inner periphery. The outer member 4, two inner races 5 and 6 each having outer circumferential surfaces 5a and 6a opposed to the outer circumferential rolling surfaces 4a and 4b in the double row, and both rolling surfaces 4a and 5a. And a plurality of balls 9 and tapered rollers 10 accommodated in a freely rotatable manner via cages 7 and 8 between 4b and 6a. Seals 11 and 12 are attached to the opening portion of the annular space formed between the outer member 4 and the two inner rings 5 and 6, leakage of grease sealed inside the bearing to the outside, and rainwater from the outside And dust are prevented from entering the bearing.

  The outer side rolling surfaces 4 a and 5 a are formed in an arc shape that makes an angular contact with the ball 9, and the inner side rolling surfaces 4 b and 6 a are formed in a taper shape that makes a line contact with the tapered roller 10. A large flange 6b for guiding the tapered roller 10 is formed on the large diameter side of the inner rolling surface 6a of the inner ring 6 on the inner side, and the tapered roller 10 is dropped on the small diameter side of the inner rolling surface 6a. A gavel 6c is formed for prevention.

  The outer member 4 is formed of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the double row outer rolling surfaces 4a and 4b have a surface hardness of 58 to 64 HRC by induction hardening. It has been cured. Further, the inner rings 5 and 6 and the balls 9 and the tapered rollers 10 are made of high carbon chrome steel such as SUJ2, and are hardened in the range of 58 to 64 HRC up to the core by quenching.

  Here, in this embodiment, the pitch circle diameter PCD of the outer side ball 9 and the pitch circle diameter PCD of the inner side tapered roller 10 are set to be the same. Therefore, the rigidity of the inner side rolling element row portion is increased, the basic load rating is larger than the basic rated load of the outer side rolling element row portion, and the load applied to the inner side rolling element row portion is increased on the outer side. Even if it becomes larger than the load applied to the rolling element row portion, the life can be made the same or more. That is, it is possible to provide a wheel bearing device that can realize a design without waste and has improved strength and durability.

  Furthermore, in this embodiment, the surface runout of the side surface Rf of the brake rotor R is regulated within the standard value. This standard value is 50 μm or less, preferably 30 μm or less. For example, in the state where the wheel bearing device with a brake rotor is assembled, as shown in FIG. 2, the regulation method is such that the outer member 4 that is a fixing member is fixed to the measuring table B, and the outer member 4 is used as a reference. The hub wheel 1 can be rotated once and the axial runout width on the side surface Rf of the brake rotor R at that time can be measured by bringing the dial gauge G into contact with the side surface Rf of the brake rotor R.

  Here, when the runout of the side surface Rf of the rotor R is outside the standard value, the brake rotor R may be simply removed from the wheel mounting flange 3 and the phase may be changed. In this embodiment, The outer side surface 3b of the wheel mounting flange 3 serving as the mounting surface of the brake rotor R is regulated in advance so as to be equal to or less than a predetermined surface run-out when the hub wheel 1 is processed alone, and after the wheel bearing device is assembled, This side surface 3b is regulated within a predetermined value by secondary cutting. Then, the surface runout of the side surface Rf of the brake rotor R and the side surface 3b on the outer side of the wheel mounting flange 3 is measured in advance before assembling, and both are restricted to a standard value or less by a selected combination.

  As described above, in the wheel bearing device with a brake rotor according to the present invention, the surface runout of the side surface Rf of the brake rotor R is previously regulated within the standard value when shipped from the wheel bearing manufacturer. This eliminates the need for troublesome adjustment of the brake rotor R in an automobile assembly plant, and can provide a wheel bearing device with a brake rotor that improves reliability.

  FIG. 3 is a longitudinal sectional view showing a second embodiment of the wheel bearing device with a brake rotor according to the present invention. This embodiment basically differs from the above-described embodiment only in the configuration of the hub wheel, and other parts having the same parts or the same functions are denoted by the same reference numerals and detailed description thereof is omitted. .

  This wheel bearing device with a brake rotor is for a driven wheel referred to as a third generation, and includes an outer member 4, a hub wheel 13, and an inner ring 6 press-fitted into the small-diameter step portion 13 b of the hub wheel 13. And an inner member 14. The hub wheel 13 is formed with an outer-side inner rolling surface 13a facing the outer-side outer rolling surface 4a and a small-diameter step portion 13b extending in the axial direction from the inner-rolling surface 13a. The inner ring 6 is press-fitted into the small-diameter step portion 13b via a predetermined squeeze, and is fixed in the axial direction by the crimping portion 1c.

  Seals 15 and 12 are attached to the opening portion of the annular space formed between the outer member 4 and the hub ring 13 and the inner ring 6, leakage of grease sealed inside the bearing to the outside, and rainwater from the outside. And dust are prevented from entering the bearing. The hub wheel 13 is made of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and extends from the seal land portion where the seal 15 is slidably contacted to the inner rolling surface 13a and the small diameter step portion 13b. The surface hardness is set to a range of 58 to 64 HRC by induction hardening.

  Here, in this embodiment, the pitch circle diameter PCD of the 9 rows of the outer side balls and the pitch circle diameter PCD of the 10 rows of the tapered rollers on the inner side are set to be the same as in the embodiment described above, and the brake rotor R The side runout of the side surface Rf is regulated to 50 μm or less. Therefore, while reducing the weight and size of the device, the rigidity of the inner side rolling element row portion is increased and the basic load rating is larger than the basic rated load of the outer side rolling element row portion, so that the inner side rolling element row portion is increased. A bearing device for a wheel with a brake rotor that can achieve the same or longer life even when the load applied to the moving body row portion is greater than the load applied to the outer rolling element row portion, and which improves reliability. Can be provided.

  FIG. 4 is a longitudinal sectional view showing a third embodiment of the wheel bearing device with a brake rotor according to the present invention. This embodiment is basically the same as the first embodiment (FIG. 1) described above, except that the pitch circle diameters of both rolling element rows are different, and the same parts or parts having the same function are the same. Reference numerals are assigned and detailed description is omitted.

  This wheel bearing device with a brake rotor is for a driven wheel called the second generation, and includes a hub wheel 16 and a wheel bearing 17 fixed to the hub wheel 16. The hub wheel 16 integrally has a wheel mounting flange 3 at an end portion on the outer side, and a small-diameter step portion 16b extending in the axial direction from the wheel mounting flange 3 via a shoulder portion 16a is formed. The wheel bearing 17 is formed by being press-fitted into the small diameter step portion 16b through a predetermined shimiro while being in contact with the shoulder portion 16a of the hub wheel 16, and by plastically deforming the end portion of the small diameter step portion 16b. It is fixed in the axial direction by the crimped portion 1c.

  The wheel bearing 17 has a vehicle body mounting flange 4c integrally on the outer periphery, an outer member 18 having double rows of outer rolling surfaces 4a, 18a formed on the inner periphery, and outer rolling of these double rows on the outer periphery. Rolls between two inner rings 19 and 20 formed with inner rolling surfaces 19a and 20a facing the surfaces 4a and 18a, respectively, and cages 7 and 21 between the rolling surfaces 4a and 19a and 18a and 20a. A plurality of balls 9 and tapered rollers 10 accommodated freely are provided. Seals 22 and 23 are attached to the openings of the annular space formed between the outer member 18 and the two inner rings 19 and 20, leakage of grease sealed inside the bearing to the outside, and rainwater from the outside And dust are prevented from entering the bearing.

  The outer member 18 is formed of medium carbon steel containing carbon 0.40 to 0.80 wt% such as S53C, and the double row outer rolling surfaces 4a and 18a have a surface hardness in the range of 58 to 64HRC by induction hardening. It has been cured. Further, the inner rings 19 and 20 are made of high carbon chrome steel such as SUJ2, and are hardened in the range of 58 to 64 HRC to the core part by quenching.

  Here, in this embodiment, the pitch circle diameter PCDi of the 10 rows of inner side tapered rollers is set to be smaller than the pitch circle diameter PCDo of the 9 rows of balls on the outer side. As a result, the outer diameter D on the inner side of the outer member 18 can be set to a small diameter, the knuckle size can be reduced without reducing the basic load rating of the inner rolling element row, and the device is lighter and more compact. Can be achieved. Further, by increasing the thickness of the inner ring 19 on the outer side corresponding to the amount of expansion of the pitch circle diameter PCDo in the 9 rows of balls on the outer side, the hub wheel 16 can be used even if the pitch circle diameters PCDo and PCDi are different. The small-diameter step portion 16b can be formed in a straight shaft shape, and the workability can be improved. Furthermore, by restricting the surface runout of the side surface Rf of the brake rotor R to 50 μm or less, it is possible to provide a wheel bearing device with a brake rotor with improved reliability.

  FIG. 5: is a longitudinal cross-sectional view which shows 4th Embodiment of the wheel bearing apparatus with a brake rotor which concerns on this invention. This embodiment basically differs from the third embodiment described above (FIG. 4) only in the configuration of the hub wheel, and other parts having the same parts or functions have the same reference numerals. Detailed description is omitted.

  This wheel bearing device with a brake rotor is for a driven wheel referred to as a third generation, and includes an outer member 18, a hub wheel 24, and an inner ring 20 press-fitted into the small-diameter step portion 24 a of the hub wheel 24. The inner member 25 is provided. The hub wheel 24 has an outer-side inner rolling surface 13a facing the outer-side outer rolling surface 4a and a small-diameter step portion 24a extending in the axial direction from the inner-rolling surface 13a. The inner ring 20 is press-fitted into the small-diameter step portion 24a via a predetermined shimoshiro and is fixed in the axial direction by the crimping portion 1c.

  Seals 22 and 23 are attached to the opening of the annular space formed between the outer member 18 and the hub ring 24 and the inner ring 20, leakage of grease sealed inside the bearing to the outside, and rainwater from the outside. And dust are prevented from entering the bearing. The hub wheel 24 is formed of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and extends from the seal land portion where the seal 22 is in sliding contact to the inner rolling surface 13a and the small diameter step portion 24a. The surface hardness is set to a range of 58 to 64 HRC by induction hardening.

  Here, in this embodiment, the pitch circle diameter PCDi of the 10 rows of inner side tapered rollers is set to be smaller than the pitch circle diameter PCDo of the 9 rows of balls on the outer side, as in the embodiment described above. Accordingly, since the number of balls in the 9 rows of outer side balls can be accommodated more than the number of tapered rollers 10 in the 10 rows of inner side tapered rollers, the overall bearing rigidity can be increased and the inner member of the outer member 18 can be increased. The outer diameter D on the side can be made small, and the knuckle size can be reduced without reducing the basic load rating of the inner bearing row. Therefore, the basic load rating of the inner bearing row is made larger than the basic load rating of the outer side bearing row while further reducing the weight and size of the device, and the load applied to the inner side bearing row is increased on the outer side. Even if it becomes larger than the load applied to the bearing row portion, the service life can be made the same or longer. Furthermore, by restricting the surface runout of the side surface Rf of the brake rotor R to 50 μm or less, it is possible to provide a wheel bearing device with a brake rotor with improved reliability.

  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 can be applied to a wheel bearing device with a brake rotor of the second or third generation structure of the inner ring rotating type regardless of whether it is for driving wheels or driven wheels.

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 the schematic which shows the measurement state of the surface runout of the side surface of the brake rotor in FIG. 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 wheel bearing apparatus. It is a longitudinal cross-sectional view which shows the other conventional wheel bearing apparatus.

Explanation of symbols

1, 13, 16, 24... Hub wheel 1a, 16a ........ Shoulders 1b, 13b, 16b, 24a... Small diameter step 1c. ···················································· Wheel Pilot 2, 17 Bearing 3 ... Wheel mounting flange 3a ... Hub bolt 3b ... · · · Outer side surfaces 4 and 18 · · · Outer members 4a, 4b and 18a · · · Outer rolling surface 4c ··· Car body mounting flanges 5, 6, 19, 20 ... Inner rings 5a, 6a, 13a, 19a, 20a Inner rolling surface 6b ... .... Daegu 6c ... ······················································································· Ball 10 ................ tapered rollers 11, 12, 15, 22, 23 ... seals 14, 25 ......... inner member 50, 64... Hub wheels 50a, 64a, 57a, 65a .. Inner rolling surfaces 50b, 63... Wheel mounting flange 51. ····················· Double row rolling bearing 52 · Outer members 53a, 53b, 62a, 62b ··· Outer rolling surfaces 53c, 62c ··· Body mounting flanges 54, 66 ··· Inward Members 55, 67, 68 ... ... Ball 56 ..... Tapered rollers 57, 65 ..... Inner rings 57a, 64a, 65a ..... Rolling surface 58 ... Outer joint member 58a ... Track groove 59 ... ...... Mouse part 60 ......... Shoulder part 61 ......... Retaining ring 64b ...・ ・ ・ ・ ・ ・ ・ ・ Small diameter step portion 64c ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Clamping portion 69, 70 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cage 71, 72・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Seal B ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Measurement D ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outside Outer diameter D1 on the inner side of the member ...円 Circle diameter D2 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Pitch circle diameter G of inner side ball ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Dial gauge PCD ・ ・ ・································································································· Pitch circle diameter of the inner side tapered roller PCDo・ Pitch circle diameter R of outer side ball ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Brake rotor Rf ・ ・ ・ ・ ・ ・ Brake rotor side

Claims (5)

An outer member integrally having a vehicle body mounting flange to be attached to the suspension device on the outer periphery, and having a double row outer rolling surface formed on the inner periphery;
A hub wheel integrally having a wheel mounting flange for mounting a wheel at one end, a small diameter stepped portion formed on the outer periphery, and press-fitted into the small diameter stepped portion of the hub wheel, and the double row outer rolling on the outer periphery An inner member composed of at least one inner ring formed with an inner rolling surface facing the surface;
A double row rolling element housed in a freely rolling manner between the rolling surfaces of the inner member and the outer member;
The inner ring is fixed in the axial direction with respect to the hub wheel by a crimping portion formed by plastically deforming an end portion of the small diameter step portion radially outward,
In the wheel bearing device with a brake rotor in which a brake rotor is mounted on the wheel mounting flange,
Out of the double row rolling elements, the outer side rolling element is a ball and the inner side rolling element is a tapered roller. The basic rated load of the inner side tapered roller row is the basic rated load of the outer side ball row. The wheel bearing with a brake rotor is characterized in that the width of the side surface of the brake rotor is regulated within a standard value while being driven to rotate with respect to the outer member. apparatus.   2. The wheel bearing device with a brake rotor according to claim 1, wherein a pitch circle diameter of the inner side tapered roller row and a pitch circle diameter of the outer side ball row are set to be the same.   The wheel bearing device with a brake rotor according to claim 1, wherein a pitch circle diameter of the inner side tapered roller row is set smaller than a pitch circle diameter of the outer side ball row.   The bearing device for a wheel with a brake rotor according to any one of claims 1 to 3, wherein a pair of inner rings are press-fitted into the small-diameter step portion of the hub ring, and the inner diameters of these inner rings are set to be the same.   An outer rolling surface on the outer side is directly formed on the outer periphery of the hub wheel, and the small-diameter step portion is formed on the inner side from the inner rolling surface, and the inner diameter is formed on the small-diameter step portion via a predetermined shimiro. The wheel bearing device with a brake rotor according to any one of claims 1 to 3, wherein the inner ring on the side is press-fitted.

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