JP2007237332A - Brake rotor machining method of bearing unit for drive wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple and inexpensive machining method for improving the run out of the end surface of a brake rotor as an alternative to the method for accurately machining each part single body. <P>SOLUTION: In a bearing unit for a driving wheel, a hub wheel 11, an outer joint member 13 of a constant velocity universal joint and an axle bearing are unitized, and at least one of double row inner races of the axle bearing 14 is formed on the outer joint member 13. A bearing outer ring 16 of the bearing unit for the driving wheel is fixedly supported, the hub wheel 11 and the outer joint member 13 are integrally rotated, a predetermined portion of the hub wheel 11 is subjected to turning work, and a brake rotor 50 is assembled to the hub wheel 11. The end surface of the brake rotor 50 is subjected to turning work while holding the turning machined portion of the hub wheel 11 with a chuck in an assembling state, and integrally rotating the hub wheel 11, the outer joint member 13, and the brake rotor 50. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a brake rotor machining method for a drive wheel bearing unit, and more specifically, a brake rotor is assembled to a drive wheel bearing unit in which an automobile hub wheel, an outer joint member of a constant velocity universal joint, and an axle bearing are unitized. The present invention relates to a machining method in which an end face of a brake rotor is turned in a state.

A power transmission system that transmits power from an automobile engine to a driving wheel needs to cope with angular displacement and axial displacement due to a change in the relative positional relationship between the engine and the wheel. For example, as shown in FIG. interposed the drive shaft 1 between the engine side and the drive wheel side, is connected to one end of the drive shaft 1 to a differential via a sliding type constant velocity joint J _1, fixed type constant velocity universal joint and the other end through J ₂ are connected to the drive wheels 2. The so-called plunging of the sliding type constant velocity universal joint J ₁ absorbs axial displacement, and the fixed type constant velocity universal joint J ₂ allows only angular displacement.

Fixed type constant velocity universal joint J ₂ is, an inner joint member 4 attached to the other end of the drive shaft 1, the outer joint member 3 which is coupled to the wheel hub 7, inner joint member 4 and the outer joint A plurality of torque transmission balls 5 incorporated between the track grooves of the member 3 and a holding member for holding the torque transmission balls 5 interposed between the outer spherical surface of the inner joint member 4 and the inner spherical surface of the outer joint member 3. The device 6 is a main component. The hub wheel 7 is rotatably supported by an axle bearing 8, and the brake rotor 10 and the wheel 2 of the driving wheel are fixed to the hub wheel 7. The hub wheel 7, the outer joint member 3 of the constant velocity universal joint J ₂ , and the axle bearing 8 are unitized for the purpose of reducing assembly costs and reducing the weight and constitute a so-called “fourth generation” bearing unit for driving wheels. ing.

  The dimensional accuracy of the drive wheel bearing unit as a whole is increased by the accuracy of the component itself. Each component is required to have an accuracy exceeding the dimensional accuracy required for the entire unit. In particular, end face runout accuracy of the brake rotor is important, and not only the dimensional accuracy of the brake rotor itself but also the flange surface of the hub wheel to which it is attached is required to have the same high accuracy. Thus, in order to achieve high accuracy as a whole unit, it is necessary to finish each component with higher accuracy.

  The so-called fourth generation bearing unit, in which the inboard raceway surface (inner race) of the axle bearing is formed on the outer diameter surface of the outer joint member, is the inner race of the outer joint member and the outer joint member. A double-row inner race is formed jointly with the inner race of the separate hub wheel. For this reason, in order to obtain a predetermined centering accuracy between the axle bearing and the hub wheel, it is necessary to strictly manage the fitting accuracy of the outer joint member with respect to the hub wheel. Therefore, the fourth generation bearing unit is required to have higher accuracy by a single component than the previous generation bearing unit, and the absorption of the cost increase due to this has been a problem.

  An object of the present invention is to provide a machining method capable of easily obtaining a desired end face runout accuracy by machining the brake rotor in a sub-assy state in which the brake rotor is assembled to the bearing unit instead of machining each component with high accuracy. Is to provide.

  In order to achieve the above-mentioned object, the invention according to claim 1 is configured such that a hub wheel, an outer joint member of a constant velocity universal joint, and an axle bearing are unitized, and at least one of the double-row inner races of the axle bearing is the outer race. The bearing outer ring of the drive wheel bearing unit formed on the joint member is fixedly supported, and the hub wheel and the outer joint member are rotated together while turning a predetermined portion of the hub wheel, and then the brake rotor is assembled to the hub wheel. In this assembled state, the end surface of the brake rotor is turned while integrally rotating the hub wheel, the outer joint member, and the brake rotor with reference to the turned portion of the hub wheel. The predetermined part of the hub wheel to be turned first is, for example, the end face of the wheel pilot. In this case, the outer diameter surface of the wheel pilot is chucked when the hub wheel, the outer joint member, and the brake rotor are rotated together.

  According to the invention of claim 2, a predetermined portion of the hub wheel is turned on the basis of the axial abutting surface of the hub wheel with respect to the outer joint member, and then the outer joint member of the constant velocity universal joint, the axle is applied to the hub wheel. A bearing and a brake rotor are assembled into a drive wheel bearing unit. In this unit state, the hub wheel, outer joint member, and brake rotor are rotated together with the hub wheel, the outer joint member, and the end surface of the brake rotor as a reference. It is characterized by turning. The axial abutment surface of the hub wheel is a part that allows adjustment of the bearing clearance (preload) by increasing or decreasing the turning allowance. When turning a single hub wheel, the outer ring surface adjacent to the race surface is chucked to rotate the hub wheel.

  According to the invention of claim 3, a predetermined portion of the hub wheel is turned on the basis of the race surface of the hub wheel, and then the outer joint member of the constant velocity universal joint, the axle bearing and the brake rotor are assembled to the hub wheel for driving. A bearing unit for a wheel, and in this unit state, the end surface of the brake rotor is turned while integrally rotating the hub wheel, the outer joint member, and the brake rotor with reference to the turned part of the hub wheel. To do. The dimensional accuracy of the race surface of the hub wheel is extremely high. The high accuracy of the race surface is used to determine the accuracy of the hub wheel chuck portion when turning the end face of the brake rotor. The predetermined portion of the hub wheel that is turned on the basis of the race surface is, for example, a wheel pilot end surface.

  According to the invention of claim 4, the race surface of the single hub wheel is turned on the basis of a predetermined portion of the hub wheel, and then the outer joint member of the constant velocity universal joint, the axle bearing and the brake rotor are assembled to the hub wheel for driving. A wheel bearing unit is provided, and in this unit state, the end surface of the brake rotor is turned while integrally rotating the hub wheel, the outer joint member, and the brake rotor with reference to the predetermined portion of the hub wheel. In this case, the predetermined portion of the hub wheel is, for example, the inner surface of the hub wheel.

  In the invention of claim 5, the hub wheel, the outer joint member of the constant velocity universal joint, the axle bearing and the brake rotor are unitized, and at least one of the double row inner races of the axle bearing is formed in the outer joint member. When turning the end face of the brake rotor of the drive wheel bearing unit, the hub wheel and the brake rotor are rotated together by gripping the wheel pilot inner diameter or outer diameter of the hub ring with a chuck. To do. The dimensional error in the portion from the hub wheel to the brake rotor is removed by turning the brake rotor.

  In the invention of claim 6, the hub wheel, the outer joint member of the constant velocity universal joint, the axle bearing and the brake rotor are unitized, and at least one of the double row inner races of the axle bearing is formed in the outer joint member. When turning the end face of the brake rotor of the drive wheel bearing unit, the inner diameter of the center hole of the hub wheel is gripped by a chuck, and the hub wheel and the brake rotor are rotated together. The dimensional error in the portion from the hub wheel to the brake rotor is removed by turning the brake rotor.

  In the invention of claim 7, the hub wheel, the outer joint member of the constant velocity universal joint, the axle bearing and the brake rotor are unitized, and at least one of the double row inner races of the axle bearing is formed in the outer joint member. When turning the end face of the brake rotor of the drive wheel bearing unit, the outer diameter of the hat portion of the brake rotor is gripped by a chuck (see chuck 56a in FIG. 1A), and the brake rotor is rotated. And Since the assembly of the brake rotor to the hub wheel has an inlay relationship in the radial direction, the axes of the brake rotor and the hub wheel are aligned with each other. Therefore, even if the outer diameter of the hat portion of the brake rotor is gripped by the chuck and rotated, the same rotational accuracy as that obtained when the hub wheel is rotated as a reference can be obtained.

  In the invention of claim 8, the hub wheel, the outer joint member of the constant velocity universal joint, the axle bearing and the brake rotor are unitized, and at least one of the double row inner races of the axle bearing is formed in the outer joint member. When turning the end surface of the brake rotor of the drive wheel bearing unit, the inner diameter or outer diameter of the outer joint member is gripped by a chuck (see chuck 56b in FIG. 1A), and the outer joint member, hub wheel, and brake The rotor is integrally rotated. The axes of the hub wheel and the outer joint member are generally aligned with high accuracy. The rotational accuracy similar to the hub wheel reference can be obtained by gripping and rotating the inner diameter or outer diameter of the outer joint member with a chuck. The dimensional error in the portion from the hub wheel to the brake rotor is removed by turning the brake rotor.

  In the invention of claim 9, the hub wheel, the outer joint member of the constant velocity universal joint, the axle bearing and the brake rotor are unitized, and at least one of the double row inner races of the axle bearing is formed in the outer joint member. When turning the end face of the brake rotor of the drive wheel bearing unit, the track groove of the outer joint member is gripped by a chuck to rotate the outer joint member and the hub wheel. The axes of the hub wheel and the outer joint member are generally aligned with high accuracy. The rotation accuracy similar to the hub wheel reference can be obtained by gripping and rotating the track groove of the outer joint member with the chuck. The dimensional error in the portion from the hub wheel to the brake rotor is removed by turning the brake rotor.

The invention of claim 10 is characterized in that, in the invention of claims 1 to 4, when turning the end face of the brake rotor, clamping is performed so as to sandwich the hub wheel and the bearing outer ring. A stable clamping state is obtained by clamping the hub wheel and the bearing outer ring.
The invention of claim 11 is characterized in that, in the invention of claims 1 to 4, when the end face of the brake rotor is turned, the hub wheel and the outer joint member are clamped so as to be sandwiched therebetween. A stable clamping state is obtained by clamping the hub wheel and the outer joint member.

  According to the present invention, the end surface of the brake rotor is turned while the hub wheel, the outer joint member, and the brake rotor are rotated together after the assembly without having to process each component of the bearing unit for the drive wheel with high accuracy. As a result, the end face runout accuracy required for the brake rotor can be easily and reliably realized at low cost.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1A is an example of a drive wheel bearing unit called a fourth generation. This bearing unit is configured by unitizing the hub wheel 11, the outer joint member 13 of the constant velocity universal joint 12, and the axle bearing 14, and the inner race on the inboard side of the axle bearing 14 is formed on the outer diameter surface of the outer joint member 13. 17b is formed.

  The axle bearing 14 supports a bearing outer ring 16 having double rows of outer races 15a and 15b, double rows of inner races 17a and 17b, double rows of rolling elements 18a and 18b, and rolling elements 18a and 18b for each row. And the cages 12a and 12b. Of the double row inner races 17 a and 17 b, one inner race 17 a is formed integrally with the outer peripheral surface of the hub wheel 11, and the other inner race 17 b is formed integrally with the outer peripheral surface of the outer joint member 13. The bearing outer ring 16 is fixed to the knuckle by a flange 19. Seals 20 are attached to the openings at both ends of the axle bearing 14 in order to prevent entry of foreign matter from the outside and leakage of grease filled inside.

  In the illustrated example, the axle bearing 14 has a double-row angular contact ball bearing structure. However, as another axle bearing having a large bearing load capacity, a double-row tapered roller bearing structure using a tapered roller as a rolling element can be adopted. .

  The hub wheel 11 includes a flange 21, and hub bolts 22 for fixing the wheel and the brake rotor are attached to the flange 21 at equal circumferential positions. An annular convex edge 23 is formed on the outer peripheral portion of the end portion of the hub wheel 11 on the outer joint member side. The bearing clearance (preload) can be adjusted by adjusting the processing amount of the annular convex edge 23. The hub wheel 11 has a hollow portion 24 opened on the end surface on the side opposite to the outer joint member, and a through hole 25 is formed in the center portion of the hub wheel 11 in the axial direction.

  The outer joint member 13 includes a mouth part 26 having a substantially bowl shape and a shaft part 27 formed integrally with the mouse part 26. A track groove 29 on which the torque transmitting ball 28 rolls is formed in the mouse portion 26 so as to extend in the axial direction at equal circumferential positions on the inner spherical surface 30.

  An inner joint member 31, a torque transmission ball 28, and a cage 32 are incorporated in the mouse portion 26. The inner joint member 31 is coupled to a drive shaft (not shown) that transmits power from the engine by serrations (or splines), and the track groove 29 of the outer joint member 13 is located at a circumferentially equal position of the outer spherical surface 33. Corresponding track grooves 34 are provided. A torque transmission ball 28 is interposed between the track groove 29 of the outer joint member 13 and the track groove 34 of the inner joint member 31 to transmit torque therebetween. Each torque transmission ball 28 is incorporated in the pocket 35 of the cage 32, and the cage 32 is interposed between the inner spherical surface 30 of the outer joint member 13 and the outer spherical surface 33 of the inner joint member 31.

  The torque transmission portion between the shaft portion 27 of the outer joint member 13 and the hub wheel 11 has an uneven mesh structure such as a spline or serration formed on the outer peripheral surface of the shaft portion 27 and the inner peripheral surface of the hub wheel 11. It is possible. The shaft part 27 and the hub wheel 11 are fixed by caulking by plastic deformation at the end part of the shaft part 27 or by a fixing nut screwed to the tip of the shaft part 11. The torque transmitting portion and the fixed portion between the shaft portion 27 and the hub wheel 11 may be realized by plastic coupling by expanding the outer diameter of the shaft portion 27 or reducing the inner diameter of the hub wheel 11.

  In the first embodiment shown in FIG. 1A, torque is transmitted by inserting and fitting the shaft portion 27 of the outer joint member 13 into the through hole 25 of the hub wheel 11. The drive wheel bearing unit shown in FIG. 2 to FIG. 7 is substantially the same as FIG. 1A except for the portion or structure of the torque transmitting portion which is different from FIG. 1A. Therefore, in FIG. 2 to FIG. 7, the same parts as those in FIG.

  The bearing unit of FIG. 2 is coupled to the hub wheel 11 by plastically deforming the distal end flange portion of the shaft portion 27a of the outer joint member 13 outward. The outer periphery of the shaft portion 27a and the inner periphery of the hub wheel 11 are engaged with each other by serration to transmit torque.

  The bearing unit of FIG. 3 fits the shaft portion 27b of the outer joint member 13 and the inner periphery of the hub wheel 11 and connects them by serration as in FIG.

  The bearing unit of FIG. 4 performs torque transmission by fitting the boss portion 11a of the hub wheel 11 inside the cylindrical shaft portion 27c of the outer joint member 13. A cone-shaped recess 11 b for heat dissipation and thinning is formed in the center of the hub wheel 11.

  The bearing unit of FIG. 5 performs torque transmission by fitting the boss portion 11a of the hub wheel 11 to the inner side of the cylindrical shaft portion 27c of the outer joint member 13 as in FIG. is doing. At the center of the hub wheel 11, a cone-shaped recess 11b for heat dissipation and thinning is formed.

  The bearing unit of FIG. 6 connects the shaft portion 27d of the outer joint member 13 and the inner periphery of the hub wheel 11 in the same manner as FIG.

  The bearing unit of FIG. 7 performs torque transmission by fitting the boss portion 11c of the hub wheel 11 inside the cylindrical shaft portion 27c of the outer joint member 13 as in FIG. It is what. Further, a through hole 25a is formed in the hub wheel 11 following the cone-shaped recess 11b to reduce heat and reduce the thickness.

  In the drive wheel bearing unit shown in FIGS. 1A and 2 to 7, the brake rotor 50 is assembled to the flange 21 of the hub wheel 11 by the hub bolt 22. The bearing unit in FIG. 1A will be described as an example. Before or after the brake rotor 50 is assembled, the end surface of the wheel pilot 11p of the hub wheel 11 is turned first. That is, as shown in FIG. 1B, the outer diameter surface of the outer ring 16 of the axle bearing 14 is held and fixedly supported by the chuck 53, and in this state, the drive shaft 51 is fitted into the center through hole of the outer joint member 13, 11 and the outer joint member 13 are rotated together. In this way, the hub wheel 11 is rotated, and the end surface of the wheel pilot 11p of the hub wheel 11 is turned by the turning tool 54. Since the outer diameter surface of the wheel pilot 11p is already parallel to the axis when the hub ring is formed, there is no need to turn again.

  Next, the brake rotor 50 is attached to the flange 21 of the hub wheel 11 using the hub bolt 22. In this sub-assembly state, the outer diameter surface of the wheel pilot 11p is gripped by a plurality of chucks 55 having an L-shaped cross section. The chuck 55 is attached to the tip of a drive shaft (not shown). When gripping with the chuck 55, the turned end surface of the wheel pilot 11p is brought into contact with the inner surface of the chuck 55 without any gap. Of course, the contact inner surfaces of the plurality of chucks 55 are included in a single plane. Thus, the axis of the drive shaft of the chuck 55 and the axis of the hub wheel 11 are accurately aligned. That is, the hub wheel 11 is chucked without being inclined with respect to the axis of the drive shaft of the chuck 55.

  Next, the drive shaft of the chuck 55 is rotated to rotate the outer joint member 13, the hub wheel 11, and the brake rotor 50 together. In this state, the turning tool 52 is illustrated from the outer peripheral side of both end faces of the brake rotor 50 as shown in the figure. Cut to the inner circumference and turn both end faces. Even if there is surface runout on both end faces of the brake rotor 50 when the brake rotor 50 is assembled to the bearing unit at the beginning, the end runout can be removed by executing the turning process after assembly as described above. In experiments by the inventors of the present application, it was confirmed that the end face runout can be reduced to 30 μm or less. The turning procedure of the wheel pilot 11p and the brake rotor 50 described above is exactly the same for the bearing unit of FIGS.

Next, a modified embodiment of the present invention will be described with reference to FIGS.
FIG. 8A corresponds to claim 2, and the end surface of the wheel pilot 11 p of the hub wheel 11 alone is held by the chuck 56 with the axial abutting surface of the hub wheel 11 against the outer joint member 3 held by the chuck 56. Turning at 54. Next, the outer joint member 3 of the constant velocity universal joint, the axle bearing 8 and the brake rotor 50 are assembled to the hub wheel 11 to form a drive wheel bearing unit. In this unit state, the wheel pilot which is a turned part of the hub wheel 11 The end surface of the brake rotor 50 is turned while the hub wheel 11, the outer joint member 3, and the brake rotor 50 are integrally rotated with reference to the end surface of 11p.

  FIG. 8B corresponds to claim 3. The inner race 17 a which is the race surface of the hub wheel 11 is held by the chuck 56, and the end surface of the wheel pilot 11 p of the hub wheel 11 alone is turned by the turning tool 54. Then, the outer joint member 3 of the constant velocity universal joint, the axle bearing 8 and the brake rotor 50 are assembled to the hub wheel 11 to form a drive wheel bearing unit. In this unit state, the hub wheel 11 has been turned. The end surface of the brake rotor 50 is turned while the hub wheel 11, the outer joint member 3, and the brake rotor 50 are rotated together with the end surface of the wheel pilot 11p as a reference.

  FIG. 8C corresponds to claim 4, and the inner race 17 a which is the race surface of the hub wheel 11 alone is held by the turning tool 54 while the outer diameter of the wheel pilot 11 p of the hub wheel 11 is held by the chuck 56. Then, the outer joint member 3 of the constant velocity universal joint, the axle bearing 8 and the brake rotor 50 are assembled to the hub wheel 11 to form a drive wheel bearing unit. In this unit state, the hub wheel 11 has been turned. The end surface of the brake rotor 50 is turned while the hub wheel 11, the outer joint member 3, and the brake rotor 50 are rotated together with the end surface of the wheel pilot 11p as a reference.

  FIGS. 8D and 8E correspond to claim 5, and the hub wheel 11, the outer joint member 3 of the constant velocity universal joint, the axle bearing 8, and the brake rotor 50 are unitized so that the axle bearing 8 can be combined. When turning the end surface of the brake rotor 50 of the drive wheel bearing unit in which at least one of the inner races in the row is formed on the outer joint member 3, the outer diameter of the wheel pilot 11p of the hub wheel 11 (FIG. 8D )) Or the inner diameter (FIG. 8E) is gripped by the chuck 56, and the hub wheel 11 and the brake rotor 50 are rotated together. In FIG. 8D, the configuration of the drive wheel bearing unit other than the hub wheel 11 is omitted for simplicity.

  FIG. 8F corresponds to claim 6, and the hub wheel 11, the outer joint member 3 of the constant velocity universal joint, the axle bearing 8, and the brake rotor 50 are unitized to form a double row inner race of the axle bearing 8. When turning the end surface of the brake rotor 50 of the drive wheel bearing unit, at least one of which is formed on the outer joint member 3, the inner diameter of the center hole of the hub wheel 11 is gripped by the chuck 56 and the hub wheel 11 and The brake rotor 50 is rotated integrally. In FIG. 8F, the configuration of the drive wheel bearing unit other than the hub wheel 11 is omitted for simplicity.

FIG. 9 corresponds to claim 10. When turning the end face of the brake rotor 50, the hub ring 11 and the bearing outer ring 16 are clamped by the chucks 61 and 62.
FIG. 10 corresponds to the eleventh aspect, and when turning the end face of the brake rotor 50, the hub wheel 11 and the outer joint member 3 are clamped by the chucks 61 and 62.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

Sectional drawing which shows the brake rotor processing method of the bearing unit for drive wheels which concerns on this invention. Sectional drawing which shows the pre-process of turning of a brake rotor. Sectional drawing which shows the other type processing method of the brake rotor of a bearing unit. Sectional drawing which shows the other type processing method of the brake rotor of a bearing unit. Sectional drawing which shows the other type processing method of the brake rotor of a bearing unit. Sectional drawing which shows the other type processing method of the brake rotor of a bearing unit. Sectional drawing which shows the other type processing method of the brake rotor of a bearing unit. Sectional drawing which shows the other type processing method of the brake rotor of a bearing unit. (A)-(F) is sectional drawing of the hub ring which shows the other type processing method of the brake rotor of a bearing unit. Sectional drawing which shows the other type processing method of the brake rotor of a bearing unit. Sectional drawing which shows the other type processing method of the brake rotor of a bearing unit. Sectional drawing of the bearing unit for drive wheels of the state with which the motor vehicle was mounted | worn.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive shaft 2 Drive wheel 3 Outer joint member 4 Inner joint member 5 Torque transmission ball 6 Cage 7 Hub wheel 8 Axle bearing 8a, 8b Ball 9 Knuckle 11 Hub wheel 11a Boss part 11b Cone-shaped recessed part 11c Boss part 12 etc. Speed universal joint 12a, 12b Cage 13 Outer joint member 14 Axle bearing 15a, 15b Outer race 16 Bearing outer ring 17a, 17b Inner race 18a, 18b Rolling element 19 Flange 20 Seal 21 Flange 22 Hub bolt 23 Annular convex edge 24 Cavity 25 Passing through Hole 26 Mouse portion 27 Shaft portion 27a Shaft portion 27b Shaft portion 27c Tubular shaft portion 27d Shaft portion 28 Torque transmission ball 29 Track groove 30 Inner spherical surface 31 Inner joint member 32 Retainer 33 Outer spherical surface 34 Track groove 35 Pocket 50 Brake rotor 51 Drive shaft 52 Turning tool 53 Chuck 54 Cutting byte 55 Chuck J ₁ sliding type constant velocity universal joint J ₂ fixed type constant velocity joint

Claims (11)

A bearing outer ring of a drive wheel bearing unit in which a hub wheel, an outer joint member of a constant velocity universal joint, and an axle bearing are unitized, and at least one of double row inner races of the axle bearing is formed on the outer joint member. While fixing and supporting, turning the hub wheel and the outer joint member integrally, turning a predetermined part of the hub wheel, then assembling the brake rotor to the hub wheel, and in this assembled state, the turned part of the hub wheel is A brake rotor machining method for a drive wheel bearing unit, characterized in that the end surface of the brake rotor is turned while gripping with a chuck and rotating the hub wheel, the outer joint member and the brake rotor together. A predetermined portion of the hub wheel is turned with reference to the axial abutting surface of the hub wheel against the outer joint member, and then the outer joint member of the constant velocity universal joint, the axle bearing and the brake rotor are assembled to the hub wheel. A bearing unit for a drive wheel, and in this unit state, the end surface of the brake rotor is turned while integrally rotating the hub wheel, the outer joint member, and the brake rotor with reference to the turned portion of the hub wheel. A brake rotor machining method for a drive wheel bearing unit. A predetermined part of the hub wheel is turned on the basis of the race surface of the hub wheel, and then the outer joint member of the constant velocity universal joint, the axle bearing and the brake rotor are assembled to the hub wheel to form a drive wheel bearing unit. A bearing unit for a drive wheel, wherein the end surface of the brake rotor is turned while the hub wheel, the outer joint member, and the brake rotor are rotated integrally with reference to the turned portion of the hub wheel in a unit state. Brake rotor processing method. The race surface of the hub wheel alone is turned on the basis of a predetermined part of the hub wheel, and then the outer joint member of the constant velocity universal joint, the axle bearing and the brake rotor are assembled to the hub wheel to form a drive wheel bearing unit. A brake rotor for a drive wheel bearing unit, wherein the end surface of the brake rotor is turned while integrally rotating the hub wheel, the outer joint member and the brake rotor with the predetermined portion of the hub wheel as a reference in the unit state. Processing method. The hub unit, the outer joint member of the constant velocity universal joint, the axle bearing and the brake rotor are unitized, and at least one of the double row inner races of the axle bearing is formed on the outer joint member. When turning the end face of a brake rotor, the hub wheel and the brake rotor are integrally rotated by gripping the wheel pilot inner diameter or outer diameter of the hub wheel with a chuck. Brake rotor processing method. The hub unit, the outer joint member of the constant velocity universal joint, the axle bearing and the brake rotor are unitized, and at least one of the double row inner races of the axle bearing is formed on the outer joint member. When turning the end face of the brake rotor, the inner diameter of the center hole of the hub wheel is gripped by a chuck so that the hub wheel and the brake rotor are rotated integrally. Processing method. The hub unit, the outer joint member of the constant velocity universal joint, the axle bearing and the brake rotor are unitized, and at least one of the double row inner races of the axle bearing is formed on the outer joint member. A brake rotor machining method for a drive wheel bearing unit, characterized in that when turning an end face of a brake rotor, the brake rotor is rotated by holding the outer diameter of the hat portion of the brake rotor with a chuck. The hub unit, the outer joint member of the constant velocity universal joint, the axle bearing and the brake rotor are unitized, and at least one of the double row inner races of the axle bearing is formed on the outer joint member. When turning the end face of the brake rotor, the inner diameter or outer diameter of the outer joint member is gripped by a chuck so that the outer joint member, the hub wheel and the brake rotor are rotated together. Brake rotor machining method for wheel bearing unit. The hub unit, the outer joint member of the constant velocity universal joint, the axle bearing and the brake rotor are unitized, and at least one of the double row inner races of the axle bearing is formed on the outer joint member. When turning the end face of the brake rotor, the track groove of the outer joint member is gripped by a chuck to rotate the outer joint member and the hub wheel. Processing method. The method for machining a brake rotor for a drive wheel bearing unit according to any one of claims 1 to 4, wherein the end surface of the brake rotor is clamped so as to sandwich the hub wheel and the bearing outer ring. The method for machining a brake rotor of a bearing unit for a drive wheel according to any one of claims 1 to 4, wherein when the end face of the brake rotor is turned, the hub wheel and the outer joint member are clamped.

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