WO2007132552A1

WO2007132552A1 - Brake rotor-equipped bearing device for wheel

Info

Publication number: WO2007132552A1
Application number: PCT/JP2007/000480
Authority: WO
Inventors: Takayuki Norimatsu; Akira Fujimura; Shinji Morita
Original assignee: Ntn Corporation
Priority date: 2006-05-15
Filing date: 2007-05-07
Publication date: 2007-11-22
Also published as: JP2007303653A

Abstract

A brake-rotor equipped bearing device for a wheel, where contradictory problems of reduction in weight and size and increase in rigidity are solved at the same time, whose strength and durability are increased, and whose reliability is enhanced. The brake-rotor equipped bearing device for a wheel has double-row rolling bodies. In the bearing device, inner rings (5, 6) are fixed by rocking die swaging and a brake rotor (R) is attached to a wheel installation flange (3). The outer rolling bodies are balls (9) and the inner rolling bodies are conical rollers (10). The basic rated load of the conical roller (10) row on the inner side is set greater than the basic rated load of the ball (9) row on the outer side. The width of run-out of a side face (Rf) of the brake rotor (R) is suppressed to fall within a standard value with the brake rotor (R) rotated with an outer member (4) as the standard. As a result, the rigidity of an inner rolling body row portion is increased, the service life of the device is extended, and vibration and uneven wear caused by face run-out of the brake rotor are prevented. Thus, the reliability of the device is enhanced.

Description

Specification

Wheel bearing device with brake rotor

Technical field

[0001] The present invention relates to a wheel bearing device with a brake rotor for rotatably supporting a wheel of an automobile or the like, and in particular, while reducing the weight and increasing the rigidity and regulating the surface vibration of the brake rotor, The present invention relates to an improved wheel bearing device with a brake rotor.

Background art

[0002] Conventionally, wheel bearing devices for supporting wheels of automobiles and the like support a hub wheel for mounting a wheel rotatably via a rolling bearing, and there are a drive wheel and a driven wheel. For structural reasons, the inner ring rotation method is generally used for driving wheels, and both the inner ring rotation method and outer ring rotation method are used for driven wheels. In this wheel bearing device, a double-row angular contact ball bearing that has a desired bearing rigidity, exhibits durability against misalignment, and has a low 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 body weight.

[0003] In addition, the wheel bearing device has a structure called a first generation in which a wheel bearing composed of a double-row anguilla ball bearing or the like is fitted between a knuckle and a hub wheel constituting a suspension device. Second generation structure with body mounting flange or wheel mounting flange formed directly on the outer periphery of the outer member, or third generation structure with one inner raceway formed directly on the outer periphery of the hub wheel, or hub It is roughly divided into the 4th generation structure in which the inner rolling surface is directly formed on the outer circumference of the outer joint member of the wheel and constant velocity universal joint.

[0004] The wheel bearing device shown in Fig. 6 is a lightweight, compact 4th generation structure, and the hub wheel 50, double row rolling bearing 51 and constant velocity universal joint 52 are united. Configured. The double row rolling bearing 51 includes an outer member 53, an inner member 54, and a plurality of poles 55 and tapered rollers 56 accommodated between the members. I have. In the following description, the side closer to the outside of the vehicle in the 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).

[0005] The outer member 53 is integrally provided with a vehicle body mounting flange 53c attached to a knuckle constituting a suspension device (not shown) on the outer periphery, and a double row outer rolling surface 53a on the inner periphery. 5 3 b is formed. Here, the diameter of the outer rolling surface 53a on the outer side is set to be smaller than the diameter of the outer rolling surface 53b on the inner side. On the other hand, the inner member 5 4 includes a hub wheel 50, an outer joint member 5 8, which will be described later, integrally formed with the hub wheel 50, and a separate inner ring 5 press-fitted into the outer joint member 5 8. 7 and.

[0006] The hub wheel 50 has integrally a wheel mounting flange 50b for mounting a wheel (not shown) at one end, and double row outer rolling surfaces 5 3a, 5 3 on the outer periphery. Out of b, the inner side rolling surface 50 0a opposite to the outer side outer rolling surface 5 3 a is directly formed, and the outer race of the inner ring 5 7 has double row outer rolling surfaces 5 3 a, 5 3 An inner rolling surface 5 7 a opposite to the inner outer rolling surface 5 3 b of b is formed.

[0007] The constant velocity universal joint 52 has an outer joint member 58 comprising a cup-shaped mouth portion 59 and a shoulder portion 60 forming the bottom of the mouth portion 59. The outer joint member A curved track groove 5 8 a is formed on the inner periphery of 58. The inner ring 5 7 is press-fitted into the outer diameter of the mouse part 59 and is fixed in the axial direction by a retaining ring 61.

[0008] A plurality of poles 5 5 between the outer rolling surfaces of the outer member 5 3 and the inner member 5 4 5 5 A plurality of tapered rollers 5 6 can freely roll between the inner rolling surfaces The pitch circle diameter of the outer balls 5 5 rows of these balls 5 5 rows and tapered rollers 5 6 rows is set smaller than the pitch circle diameter of the inner tapered rollers 5 6 rows Yes. As a result, the basic load rating of the inner rolling element row portion, which is larger than the outer rolling element row portion, is made larger than the basic load rating of the outer rolling element row portion. The life of the rolling element 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 5 7 is fixed to the mouse part 59 of the outer joint member 58, it is certainly compact in the axial direction. However, the outer diameter itself of the outer member 53 is increased, which not only hinders weight reduction, but is also undesirable due to a design change of peripheral parts such as a knuckle. A wheel bearing device as shown in Fig. 7 is known as a solution to these problems.

[0010] This wheel bearing device has a vehicle body mounting flange 6 2 c integrally attached to a knuckle (not shown) on the outer periphery, and a double row outer rolling surface 6 2 a on the inner periphery. 6 2 b The outer member 6 2 is formed on one end and the wheel mounting flange 6 3 for attaching the wheel (not shown) at one end is integrated into the outer periphery. 2 a, 6 2 b, the inner side rolling surface 6 4 a opposite to the outer side outer rolling surface 6 2 a, and a small-diameter step portion 6 4 b extending axially from the inner rolling surface 6 4 a The hub wheel 6 4 formed and the small-diameter step portion 6 4 b of this hub wheel 6 4 are externally fitted to the outer rolling surface on the inner side of the double row outer rolling surfaces 6 2 a and 6 2 b. 6 2 b Inner raceway face 6 5 b Inner ring 6 5 formed with inner ring 6 5 and double row poles 6 7 and 6 8 accommodated between both raceway faces Roll these double-row poles 6 7 and 6 8 It is composed of double-row anguillar ball bearings with cages 69, 70 that can be moved freely.

[001 1] The inner ring 65 is fixed in the axial direction by a caulking portion 6 4 c formed by plastic deformation of the small-diameter stepped portion 6 4 b of the hub wheel 6 4 radially outward. The seals 7 1 and 7 2 are attached to the opening of the annular space formed between the outer member 62 and the inner member 66, and leakage of the lubricating grease sealed inside the bearing Prevents rainwater and dust from entering the bearing.

[0012] Here, the outer-side balls 6 7 rows of pitch circle diameters D 1 force are set larger than the inner-side balls 6 8 rows of pitch circle diameters D 2. Accordingly, the inner raceway surface 6 4 a of the hub wheel 6 4 has a larger diameter than the inner raceway surface 65 5 a of the inner race 65, and the outer raceway surface on the outer side of the outer member 6 2 is also adjusted. 6 2 a has a larger diameter than the outer rolling surface 6 2 b on the inner side. And the outer ball 6 7 is accommodated more than the inner pole 68. In this way, 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 long life of the wheel bearing device is achieved. (For example, see Patent Document 2).

Patent Document 1: Japanese Patent Laid-Open No. 1-9-9 30 8

Patent Document 2: Japanese Patent Laid-Open No. 2 0 0 4 _ 1 0 8 4 4 9

Disclosure of the invention

Problems to be solved by the invention

In such a conventional wheel bearing device, the pitch circle diameter D 1 of the outer side pole 6 7 rows is set larger than the pitch circle diameter D 2 of the inner side ball 68 rows, Accordingly, the inner raceway surface 6 4 a of the hub wheel 6 4 has a larger diameter than the inner raceway surface 6 5 a of the inner race 65. As a result, the rigidity of the bearing row on the one side of the tower can be improved while avoiding an increase in the size of the device, and the service life of the wheel bearing device can be extended. However, the load applied to each row on the inner side and the outer side is different from each other, and the load applied to the rolling element row portion on the inner side is generally larger than the load applied to the rolling element row portion on the outer side. It is. In such a case, in this conventional wheel bearing device, the basic load rating of the inner rolling element row portion is smaller than the basic load rating of the outer rolling element row portion, resulting in a shorter life.

[0014] The present invention has been made in view of such circumstances, and at the same time, it solves the conflicting problems of light weight and compactness and high rigidity of the device, and at the same time, improved the strength and durability of the brake rotor. The object is to provide a bearing device for a wheel with a wheel.

[001 5] 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.

Means for solving the problem

[001 6] In order to achieve the object, the invention according to claim 1 of the present invention is suspended on the outer periphery. It has a vehicle body mounting flange that can be attached to the device, and an outer member with a double row outer raceway formed on the inner periphery, and a wheel mounting flange that is used to attach a wheel to one end. A hub wheel having a small-diameter step portion formed on the outer periphery, and at least one inner rolling surface that is press-fitted into the small-diameter step portion of the hub wheel and that faces the outer rolling surface of the double row on the outer periphery. An inner member composed of two inner rings, and a double-row rolling element that is rotatably accommodated between the rolling surfaces of the inner member and the outer member, and the end of the small-diameter stepped portion has a diameter. The inner ring is fixed in the axial direction with respect to the hub wheel by a caulking portion formed by plastic deformation outward in the direction, and the wheel shaft with a brake rotor has a brake rotor attached to the wheel mounting flange. In the receiving device, out of the double row rolling elements The negative 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 set larger than the basic rated load of the outer side ball row. At the same time, the swing width of the side surface of the brake rotor is regulated within a standard value in a state where it is rotationally driven with respect to the outer member.

In this way, the second or third generation wheel bearing with brake rotor is equipped with a double row rolling element, the inner ring is fixed by swing caulking, and the brake rotor is mounted on the wheel mounting flange of the hub wheel. In the machine, out of the double row rolling elements, the outer one rolling element is a pole and the inner side rolling element is a tapered roller, and the basic rated load of this inner side tapered roller row is the basic of the outer side pole row. It is set to be larger than the rated load, and the runout width of the side surface of the brake rotor is regulated within the standard value with the outer member being driven to rotate. As the rigidity of the roller increases, the life can be made the same or longer even if the load applied to the inner rolling element row portion is greater than the load applied to the outer rolling element row portion. Therefore, it is possible to realize a design without waste, and to improve the strength and durability and eliminate the need for troublesome adjustment of the side of the brake rotor at the automobile assembly site, thereby improving reliability. It is possible to provide a wheel bearing device with a brake rotor. [0018] 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 pole row on the outer side may be set to be the same. In addition, as in the invention described in claim 3, the pitch circle diameter of the inner cone row may be set smaller than the pitch circle diameter of the outer pole 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 side rolling element row, and the device can be made lighter and more compact. be able to.

[0019] Further, as in the invention according to claim 4, if 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, The diameter step can be formed into a streak shape, and the workability of the hub ring can be improved.

[0020] Further, as in the invention according to claim 5, an outer inner rolling surface is directly formed on an 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-side inner ring is press-fitted into the small-diameter step portion through a predetermined shim opening, the apparatus can be further reduced in weight and size. The invention's effect

[0021] The wheel bearing device with a brake rotor according to the present invention has a 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. An outer member and a wheel mounting flange for mounting a wheel at one end are integrally formed, 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 composed of at least one inner ring formed with an inner rolling surface facing the double row outer rolling surface, and freely rollable between both rolling surfaces of the inner member and the outer member. The inner ring is fixed in the axial direction with respect to the hub ring by a crimped portion formed by plastically deforming the end portion of the small diameter step portion radially outward. And a brake rotor mounted on the wheel mounting flange. Oite the Kirota equipped wheel support bearing assembly, the rolling elements of the outer side of the rolling elements of the double row pole, the inner side The rolling element is a tapered roller, and the basic rated load of the inner side tapered roller row is set larger than the basic rated load of the outer side pole row, and the runout width of the side surface of the brake rotor is Since the outer member is rotationally driven with respect to the standard value, it is regulated within the standard value, so that the rigidity of the rolling element row portion on the inner side becomes high and the load applied to the rolling element row portion on the inner side is increased. Even if the load is greater than the load applied to the rolling element row on the outer side, the service life can be made the same or longer. Therefore, it is possible to realize a design without waste and to improve strength and durability, and at the time of an automobile assembly plant, there is no need to perform troublesome side adjustment of the brake motor, thereby improving reliability. It is possible to provide a wheel bearing device with a brake rotor.

BEST MODE FOR CARRYING OUT THE INVENTION

[0022] —Hub wheel having a wheel mounting flange for attaching a wheel to an end portion, and having a small diameter step portion extending in the axial direction from the wheel mounting flange on the outer periphery; and a small diameter step portion of the hub ring A wheel bearing device comprising a wheel bearing press-fitted into the wheel, the wheel bearing integrally having a body mounting flange for mounting on a suspension device on the outer periphery, and a double row outer surface on the inner periphery. An outer member in which a rolling surface is formed; a pair of inner rings in which an inner rolling surface facing the outer rolling surface of the double row is formed on an outer periphery; A plurality of rolling elements housed therein, and the inner ring is connected to the hub in a state where a predetermined bearing preload is applied by a caulking portion formed by plastically deforming an end portion of the small diameter step portion radially outward. Fixed to the wheel in the axial direction, and the wheel mounting flange In the wheel bearing device with a brake rotor to which a rotor is attached, the outer side rolling element is a ball and the inner side rolling element is a tapered roller among the double row rolling elements. The rated load is set to be larger than the basic rated load of the outer-side ball row, and the runout width of the side surface of the brake rotor is within the standard value in a state of being rotationally driven with reference to the outer member. It is regulated.

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 diagram showing a measurement state of side runout of the brake rotor in FIG. is there.

The 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, and a wheel pilot 1 d is formed at the center of the side surface 3 b on the outer side. At the same time, hub bolts 3 a are planted on the wheel mounting flange 3 at equal intervals in the circumferential direction. The brake rotor R is fixed to the side surface 3 b on the one side of the wheel mounting flange 3 by the hub bolt 3 a. Further, a small diameter step portion 1 b extending in the axial direction from the base portion of the wheel mounting flange 3 via the shoulder portion 1 a is formed.

[0025] The wheel bearing 2 is press-fitted into the small-diameter step portion 1b through a predetermined shimiro while being in contact with the shoulder portion 1a of the hub wheel 1, and the end portion of the small-diameter step portion 1b is It is fixed in the axial direction by a caulking portion 1 c formed by plastic deformation. The hub ring 1 is formed of medium carbon steel containing carbon 0.40 to 0.8 O wt% such as S 53 C, and is hardened by induction hardening from the shoulder 1a to the small diameter step 1b. Has been cured to a range of 5 8-6 4 HRC. Note that the caulking portion 1c remains the surface hardness after forging. This has sufficient mechanical strength against the rotational bending load applied to the wheel mounting flange 3, and improves the fretting resistance of the small-diameter stepped portion 1b that becomes the fitting portion of the wheel bearing 2. At the same time, the plastic working of the caulking portion 1c can be smoothly performed while preventing the occurrence of minute cracks and the like.

[0026] The wheel bearing 2 is integrally provided with a vehicle body mounting flange 4c to be attached to a knuckle (not shown) constituting a suspension device on the outer periphery, and a double row outer rolling surface 4 on the inner periphery. Two outer rings with outer members 4 with a and 4 b and inner rolling surfaces 5 a and 6 a facing the outer circumferential surfaces 4 a and 4 b of the double row on the outer circumference. 5 and 6, and a plurality of balls 9 and tapered rollers 10 accommodated between the rolling surfaces 4a, 5a and 4b and 6a via the cages 7 and 8 so as to roll freely. Have . Seals 1 1 and 1 2 are attached to the opening of the annular space formed between the outer member 4 and the two inner rings 5 and 6, and leakage of grease sealed inside the bearing Prevents rainwater and dust from entering the bearing from the outside.

[0027] Rolling surfaces 4a and 5a on the outer side are formed in an arc shape that makes an annulus contact with ball 9, and rolling surfaces 4b and 6a on the inner side make line contact with tapered roller 10 It is formed like a paper. A large flange 6 b for guiding the tapered roller 10 is formed on the large diameter side of the inner rolling surface 6 a of the inner ring 6 on the inner side, and a cone is formed on the small diameter side of the inner rolling surface 6 a. A gavel 6 c is formed to prevent the roller 10 from falling off.

[0028] The outer member 4 is formed of medium carbon steel containing carbon 0.40 to 0.80 wt% such as S 53 C, and the double row outer rolling surfaces 4 a and 4 b are induction-hardened. The surface hardness is hardened in the range of 58 to 64 HRC. Inner rings 5 and 6 and pole 9 and tapered roller 10 are made of high carbon chrome steel such as SU 2 and hardened in the range of 5 8 to 64 4 H R C to the core part by quenching.

Here, in this embodiment, the pitch circle diameter P CD of the outer pole 9 and the pitch circle diameter P CD of the inner tapered roller 10 are set to be the same. Therefore, 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 load applied to the inner one rolling element row portion is larger on the outer side. Even if the load is larger than the load applied to the rolling element row portion of this, the life can be made the same or more. In other words, 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 R f of the brake rotor R is regulated within the standard value. This standard value is 50 mm or less, preferably 30 mm or less. For example, in the state where the wheel bearing device with a brake rotor is assembled, as shown in FIG. 2, the outer member 4 which is a fixing member is fixed to the measuring table B, and the outer member 4 is The hub wheel 1 is rotated once with respect to the reference, and the axial runout width at the side face R f of the brake port R at that time is determined as the side face R f of the brake rotor The measurement can be performed by bringing the dial gauge G into contact with the measurement.

[0031] Here, if the runout of the side surface R f of the rotor R is outside the standard value, it may be necessary to simply remove the brake rotor R from the wheel mounting flange 3 and change the phase. In the embodiment, the outer side surface 3 b of the wheel mounting flange 3 that serves as the mounting surface of the brake rotor R is previously regulated so as to be equal to or less than a predetermined surface run-out when the hub wheel 1 is processed alone, and the wheel bearing device After assembling, the side surface 3 b is further regulated to a predetermined value by secondary cutting. Then, the side runout of the side surface Rf of the brake rotor R and the side surface 3b on the one side of the wheel at the wheel mounting flange 3 is measured in advance before assembling, and both are regulated so as to be below the standard value by the 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 R f of the brake rotor R is previously regulated within the standard value when shipped from the wheel bearing manufacturer. Therefore, there is no need for troublesome vibration adjustment of the brake rotor R in the automobile assembly plant, and a wheel bearing device with a brake rotor can be provided with improved reliability.

Example 2

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 is basically different 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 called the third generation, and includes an outer member 4, a hub wheel 1 3, and a small diameter step portion 1 3 b of the hub wheel 13. And an inner member 14 composed of an inner ring 6 press-fitted into the inner ring 6. The hub wheel 1 3 includes an outer-side inner rolling surface 1 3 a facing the outer-side outer rolling surface 4 a on the outer periphery, and a small-diameter step portion 1 3 extending in the axial direction from the inner-rolling surface 1 3 a. b is formed. The inner ring 6 is press-fitted into the small-diameter stepped portion 13 b through a predetermined shim opening, and is fixed in the axial direction by the crimping portion 1 c.

An opening in the annular space formed between the outer member 4 and the hub ring 13 and the inner ring 6 Seals 15 and 12 are attached to the parts to prevent leakage of grease sealed inside the bearing and prevent rainwater and dust from entering the bearing from the outside. The hub wheel 1 3 is formed of medium carbon steel containing carbon 0.40 to 0.80 wt%, such as S 5 3 C, and the inner rolling surface 1 3 from the seal land portion where the seal 15 is in sliding contact. The surface hardness is hardened to a range of 5 8 to 6 4 HRC by induction hardening over a and the small diameter step portion 1 3 b.

Here, in the present embodiment, the pitch circle diameter PCD of the 9 rows of balls on the outer side and the pitch circle diameter PCD of the 10 rows of tapered rollers on the inner side are set to be the same as in the embodiment described above. The surface runout of the side surface R f of the brake rotor R is restricted to 50 〃m or less. Therefore, while making the device lighter and more compact, the inner side rolling element row portion becomes more rigid, and the basic load rating is larger than the outer side rolling element row portion basic load rating. Even if the load applied to the moving body row portion is greater than the load applied to the outer rolling element row portion, the life of the wheel bearing device with a brake rotor can be improved to improve the reliability. Can be provided.

Example 3

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 basically differs from the first embodiment (FIG. 1) described above only in the pitch circle diameter of both rolling element rows, except for the same part—the same part or part having the same function. 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. Yes. The hub wheel 16 is integrally provided with a wheel mounting flange 3 at the outer end, and a small-diameter step portion 16 b extending from the wheel mounting flange 3 in the axial direction through a shoulder portion 16 a is formed. ing. The wheel bearing 17 is press-fitted into the small-diameter step portion 16 b through a predetermined shimiro while being abutted against the shoulder portion 16 a of the hub wheel 16, and the small-diameter step portion 16 b To the crimped part 1c formed by plastically deforming the end Therefore, it is fixed in the axial direction.

[0039] The wheel bearing 17 has an outer member 18 having a vehicle body mounting flange 4c integrally formed on the outer periphery and a plurality of outer rolling surfaces 4a, 18a formed on the inner periphery, Two inner races 1 9 and 20 with outer rolling surfaces 1 9 a and 20 a respectively formed on the outer circumference facing these double-row outer rolling surfaces 4 a and 18 a, and both rolling surfaces 4 A plurality of balls 9 and tapered rollers 10 are provided between a, 19a and 18a, 20a, which are rotatably accommodated via cages 7 and 21, respectively. Seals 22 and 23 are attached to the opening of the annular space formed between the outer member 1 8 and the two inner rings 1 9 and 20, and leakage of grease sealed inside the bearing to the outside This prevents rainwater and dust from entering the bearings from the outside.

[0040] The outer member 1 8 is formed of medium carbon steel containing 0.40 to 0.80 wt% of carbon such as S 53 C, and the double row outer rolling surfaces 4 a and 18 a are formed by induction hardening. The surface hardness is set in the range of 58 to 64 H RC. The inner rings 19 and 20 are made of high carbon chrome steel such as SU J 2 and hardened in the range of 58 to 64 HRC up to the core part by quenching.

Here, in the present embodiment, the pitch circle diameter PC D i of the inner side tapered roller 10 row is set smaller than the pitch circle diameter PCD o of the outer side pole 9 row. 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 lowering the basic load rating of the inner rolling element row, and the weight of the device It can be made compact. In addition, there is a difference in pitch circle diameter PCDo and PCD i by increasing the thickness of outer ring inner ring 19 corresponding to the expansion amount of pitch circle diameter PC Do in 9 rows of outer poles. In addition, the small-diameter step portion 16 b of the hub wheel 16 can be formed in a straight shaft shape, and workability can be improved. In addition, since the surface runout of the side surface R f of the brake rotor R is restricted to 5 OjUm or less, it is possible to provide a wheel bearing device with a brake rotor with improved reliability. FIG. 5 is a longitudinal sectional view showing a fourth embodiment of the wheel bearing device with a brake rotor according to the present invention. This embodiment basically differs from the third embodiment (FIG. 4) described above 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. Therefore, detailed explanation is omitted.

This wheel bearing device with a brake rotor is for a driven wheel called the third generation, and includes an outer member 18, a hub wheel 2 4, and a small-diameter step portion 2 4 of the hub wheel 24. and an inner member 25 made of an inner ring 20 press-fitted into a. The hub wheel 24 has an outer inner rolling surface 1 3 a facing the outer outer rolling surface 4 a on the outer periphery, and a small diameter step portion 2 4 extending in the axial direction from the inner rolling surface 1 3 a. a is formed. The inner ring 20 is press-fitted into the small-diameter step portion 24 4a through a predetermined shim opening, and is fixed in the axial direction by the crimping portion 1c.

[0044] Seals 2 2 and 2 3 are attached to the openings of the annular space formed between the outer member 1 8 and the hub ring 2 4 and the inner ring 20, and the exterior of the grease sealed inside the bearing And prevents rainwater and dust from entering the bearings from the outside. The hub wheel 24 is made of medium carbon steel containing carbon 0.40 to 0.80 wt% such as S53C, and the inner rolling surface 1 3 from the seal land where the seal 2 2 is in sliding contact. The surface hardness is hardened to a range of 5 8 to 6 4 HRC by induction hardening over a and the small diameter step portion 2 4 a.

[0045] Here, in the present embodiment, the tapered roller on the inner side is similar to the above-described embodiment.

The pitch circle diameter PCD i of 10 rows is set smaller than the pitch circle diameter PCD o of the 9 rows of outer poles. As a result, the number of balls in the 9 rows of the outer side balls can be accommodated more than the number of tapered rollers 10 in the 10 rows of the inner side tapered rollers, so that the overall bearing rigidity is increased and the outer member The outer diameter D on the inner side in 18 can be made smaller, 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 side bearing row is made larger than the basic load rating of the outer side bearing row while further reducing the weight of the device. Thus, even if the load applied to the inner bearing row is greater than the load applied to the outer bearing row portion, the service life can be made the same or longer. In addition, since the runout of the side surface R f of the brake rotor R is restricted to 50 m 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 within the scope not departing from the gist of the present invention. Of course, the present invention can be implemented in various forms, and 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, Includes all changes.

Industrial applicability

[0047] The wheel bearing device with a brake rotor according to the present invention is 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. be able to.

Brief Description of 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.

[Fig. 2] A schematic diagram showing the measured state of runout of the side surface of the brake rotor in Fig. 1.

FIG. 3 is a longitudinal sectional view showing a second embodiment of a wheel bearing device with a brake rotor according to the present invention.

FIG. 4 is a longitudinal sectional view showing a third embodiment of a wheel bearing device with a brake rotor according to the present invention.

FIG. 5 is a longitudinal sectional view showing a fourth embodiment of a wheel bearing device with a brake rotor according to the present invention.

FIG. 6 is a longitudinal sectional view showing a conventional wheel bearing device.

FIG. 7 is a longitudinal sectional view showing another conventional wheel bearing device. Explanation of symbols

1, 1 3, 1 6, 24

1 a, 1 6 aShoulder

1 b, 1 3 b, 1 6 b, 24 a

1Casting part

1 d ■ ■ wheel pie mouth

2, 1 7 ■ ■ • Wheel bearings

3 ■ Wheel mounting flange

3 ■ Hub Port

3 b ■ Outer side

4, 1 8 ■ ■ • Outer member

4 a, 4 b, 1 8 a ■ ■ ■ Outer rolling surface

4 ■ Body mounting flange

5, 6, 19, 20

5 a, 6 a, 1 3 a, 1 9 a, 20 a Inner rolling surface

6 b ■ ■ Daegu

6 ■ Gavel

7, 8, 2 1Cage

9 ■ Ball

1 0 ■ ■ Conical roller

1 1, 1 2, 1 5, 22, 23

1 4, 25 ■ ■ Inner material

5 0, 64 ■ Hub wheel

50 0, 64 a, 57 a, 65 a-Inner rolling surface

5 0 b, 63 ■ Wheel mounting flange

5 1--Double row rolling bearing

5 2 ■ • Constant velocity universal joint

5 3, 62 ■ • Outer member 6 2 b ■ Outer rolling surface

Body mounting flange

Inner member

ball

Tapered roller

A wheel

Outer joint member

卜 Rack groove

Mouse part

Shoulder

Retaining ring

Small diameter step

Caulking part

Cage

sticker

Measuring table

Inner side outer diameter of outer member Pitch circle diameter of outer side pole Pitch circle diameter of inner side pole Dial gauge

Pitch circle diameter

Pitch circle diameter of inner side tapered roller Pitch circle diameter of outer side ball Brake rotor

Side of brake rotor

Claims

The scope of the claims

[1] An outer member integrally having a vehicle body mounting flange to be attached to the suspension on the outer periphery, and having a double row outer rolling surface formed on the inner periphery;

-Hub wheel with a wheel mounting flange for mounting the wheel at the end, with a small diameter step formed on the outer periphery, and press-fitted into the small diameter step of this hub wheel, and on the outer periphery An inner member composed of at least one inner ring formed with an inner rolling surface facing the rolling surface;

The inner member and a double row rolling element accommodated between the rolling surfaces of the outer member so as to roll freely,

The inner ring is fixed to the hub wheel in the axial direction by a caulking part formed by plastically deforming an end of the small diameter step part radially outward,

In the wheel bearing device with a brake rotor in which a brake rotor is mounted on the wheel mounting flange,

Of the double row rolling elements, the outer one rolling element is a pole, the inner rolling element is a tapered roller, and the basic load rating of the inner side tapered roller row is the basic of the outer side ball row. With a brake rotor characterized in that it is set to be larger than the rated load, 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. Bearing device for wheels.

[2] The bearing device for a vehicle with a brake rotor according to claim 1, wherein a pitch circle diameter of the tapered roller row on the inner side and a pitch circle diameter of the ball row on the outer side are set to be the same.

3. The bearing device for a wheel with a brake rotor according to claim 1, wherein a pitch circle diameter of the inner side tapered roller row is set to be smaller than a pitch circle diameter of the outer side ball row.

4. The bearing device for a vehicle 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 wheel, and the inner diameters of these inner rings are set to be the same. An 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. The wheel bearing device with a brake rotor according to any one of claims 1 to 3, wherein the inner ring on the inner side is press-fitted.