JP2008128450A - Wheel bearing device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel bearing device whose bearing rigidity is increased to give a longer life to a bearing and whose bearing accuracy is improved, and to provide its manufacturing method. <P>SOLUTION: The method is provided for manufacturing the wheel bearing device comprising an outward member 2 having an integrated vehicle body mounting flange 2c formed on the outer periphery and mounted on a knuckle and having double row outside rolling surfaces 2a, 2b formed on the inner periphery, the double row outside rolling surfaces 2a, 2b being different in pitch circle diameter and thus being different in groove diameter. Herein, an end face Fb on the inner side of the outward member 2 is ground concurrently with an outer peripheral face 21 on the inner side to be the fitting face of the knuckle by a form grinding wheel 23, and its profile irregularity is restricted as predetermined. With the end face Fb as a reference face, the double row outside rolling surfaces 2a, 2b are ground at the same time by the form grinding wheel 25. Thus, the wheel bearing device is obtained in which the double row outside rolling surfaces 2a, 2b have improved circularity and run-out accuracy and whose bearing accuracy is improved. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel bearing device for rotatably supporting a wheel of an automobile or the like, and more particularly to a wheel bearing device for increasing the bearing rigidity to increase the bearing life and improving the bearing accuracy. It relates to a manufacturing method.

  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. In this double row angular contact ball bearing, a plurality of balls are interposed between a fixed ring and a rotating ring, and a predetermined contact angle is given to the balls so as to contact the fixed ring and the rotating ring.

  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. 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).

  In such a wheel bearing device composed of double-row rolling bearings, the left and right rows of bearings have the same specifications so far. Absent. That is, the position of the vehicle weight when stationary is determined so that it acts on the approximate center of the double row rolling bearing, but when turning, the opposite side of the turning direction (when turning right, the vehicle A large radial load or axial load is applied to the left axle. Therefore, at the time of turning, it is effective to increase the rigidity of the outer bearing row rather than the inner bearing row. Then, what is shown in FIG. 4 is known as a bearing device for wheels which achieved high rigidity without enlarging an apparatus.

  This wheel bearing device 50 has a vehicle body mounting flange 51c integrally attached to a knuckle (not shown) on the outer periphery, and an outer side in which double row outer rolling surfaces 51a and 51b are formed on the inner periphery. A member 51 and a wheel mounting flange 53 for mounting a wheel (not shown) at one end are integrally formed, and one inner rolling surface 52a facing the double row outer rolling surfaces 51a and 51b on the outer periphery. The hub wheel 52 formed with a small diameter step portion 52b extending in the axial direction from the inner rolling surface 52a and the small diameter step portion 52b of the hub wheel 52 are externally fitted to the double row outer rolling surface 51a, 51b. An inner member 55 composed of an inner ring 54 formed with the other inner rolling surface 54a facing each other, a double row of balls 56 and 57 accommodated between both the rolling surfaces, and these balls 56 and 57 Cages 58 and 5 that hold the roll freely. It is composed of a double row angular contact ball bearing with and.

  The inner ring 54 is fixed in the axial direction by a caulking portion 52c formed by plastically deforming a small diameter step portion 52b of the hub wheel 52 radially outward. Seals 60 and 61 are attached to the opening of the annular space formed between the outer member 51 and the inner member 55, leakage of the lubricating grease sealed inside the bearing, and rainwater from the outside into the bearing. And dust are prevented from entering.

Here, the pitch circle diameter D1 of the outer side balls 56 group is set larger than the pitch circle diameter D2 of the inner side balls 57 group. Along with this, the inner rolling surface 52a of the hub wheel 52 is expanded in diameter than the inner rolling surface 54a of the inner ring 54, and the outer rolling surface 51a on the outer side of the outer member 51 is also rolled on the inner side. The diameter is larger than that of the surface 51b. The outer side balls 56 are accommodated more than the inner side balls 57. 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 50 can be extended. it can.
JP 2004-108449 A

  The outer member 51 in this type of conventional wheel bearing device 50 is formed of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon, and after forging, turning, and induction heat treatment, FIG. ), The outer side end face Fa of the outer member 51 is brought into contact with the magnet chuck 62 and is aligned with a support member (shoe) 64 so that a knuckle (not shown) is fitted therein. The outer peripheral surface 63 on the side is ground by a grinding wheel 65. Furthermore, as shown in (b), in the state where the inner end face Fb of the outer member 51 is in contact with the magnet chuck 62, the double-row outer rolling surfaces 51a, 51b are It is simultaneously ground and then superfinished. Here, the body mounting flange 51c and the end faces Fa and Fb are generally not turned after being turned.

  However, if the accuracy of the end faces Fa and Fb serving as the processing reference surfaces of the vehicle body mounting flange 51c serving as the knuckle mounting surface and the double row outer rolling surfaces 51a and 51b is poor, misalignment increases and these outer rolling surfaces 51a. Since the roundness and runout accuracy of 51b may deteriorate, conventionally, in order to avoid deformation due to heat treatment, the vehicle body mounting flange 51c and the end faces Fa and Fb may be subjected to secondary turning after high frequency heat treatment. Such post-processing has been desired to be improved because the processing man-hours become complicated and processing costs increase.

  The present invention has been made in view of such circumstances, and provides a wheel bearing device and a method of manufacturing the same that increase the bearing rigidity to extend the life of the bearing and improve the bearing accuracy. It is an object.

  In order to achieve the object, the invention according to claim 1 of the present invention has a vehicle body mounting flange integrally attached to the knuckle on the outer periphery, and a double row outer rolling surface is formed on the inner periphery. An outer member, an inner member provided with a double row inner rolling surface facing the outer row rolling surface of the double row on the outer periphery, and between both rolling surfaces of the inner member and the outer member. In a wheel bearing device including a double row rolling element group accommodated in a freely rolling manner, at least an inner side end face of both end faces of the outer member is regulated to a predetermined surface accuracy by grinding. .

  Thus, in the wheel bearing device including the outer member integrally including the vehicle body mounting flange on the outer periphery and having the double row outer raceway formed on the inner periphery, at least of the both end surfaces of the outer member. Since the end surface on the inner side is regulated to a predetermined surface accuracy by grinding, it is possible to grind the outer surface of the double row with this end surface as a reference surface. Thus, the wheel bearing device can be provided which can improve the degree of accuracy and the run-out and improve the bearing accuracy.

  Preferably, as in the invention according to claim 2, the pitch circle diameter of the outer side rolling element group in the double row rolling element group is set larger than the pitch circle diameter of the inner side rolling element group. If this is done, the bearing space can be effectively utilized to reduce the weight and size, and the bearing rigidity of the outer side portion can be increased compared to the inner side, so that the life of the bearing can be extended.

  According to a third aspect of the present invention, the outer peripheral surface on the inner side that becomes the fitting surface of the knuckle is simultaneously ground with the end surface on the inner side by a general grinding wheel, and is regulated to a predetermined surface accuracy. If so, the roundness and runout accuracy of the double row outer raceway can be further improved.

  Further, as in the invention described in claim 4, if the inner side surface of the vehicle body mounting flange is simultaneously ground with the end surface on the inner side by a general grinding wheel and is regulated to a predetermined surface accuracy. The surface accuracy of the vehicle body mounting flange can be greatly improved, and misalignment can be suppressed.

  According to a fifth aspect of the present invention, there is provided a method invention according to claim 5, wherein an outer member having a body mounting flange integrally attached to a knuckle on the outer periphery and a double row outer rolling surface formed on the inner periphery; An inner member having a double row inner raceway facing the outer raceway of the double row on the outer periphery, and freely rollable between both rolling surfaces of the inner member and the outer member. In the manufacturing method of the wheel bearing device including the accommodated double row rolling element group, at least an inner side end surface of both end surfaces of the outer member and an inner side outer peripheral surface serving as a fitting surface of the knuckle Is ground to a predetermined surface accuracy by a general grinding wheel, and the double row outer rolling surfaces are simultaneously ground by the general grinding wheel with the inner end face as a reference surface.

  A wheel bearing device according to the present invention has a body mounting flange integrally attached to a knuckle on an outer periphery, an outer member having a double row outer raceway formed on an inner periphery, and the compound member on an outer periphery. An inner member provided with a double row inner rolling surface facing the outer rolling surface of the row, and a double row accommodated in a freely rollable manner between both rolling surfaces of the inner member and the outer member In the wheel bearing device including the rolling element group, at least an inner side end surface of the both end surfaces of the outer member is regulated to a predetermined surface accuracy by grinding, so that this end surface is used as a reference surface. Provided is a wheel bearing device that can improve the roundness and runout accuracy of a double row outer rolling surface and can improve the bearing accuracy because the outer rolling surface of the row can be ground. Can do.

  A body mounting flange for mounting to the knuckle on the outer periphery is integrated, an outer member with a double row outer raceway formed on the inner periphery, and a wheel mounting flange for mounting the wheel on one end is integrated. A hub wheel having one inner rolling surface facing the outer rolling surface of the double row on the outer periphery, a small diameter step portion extending in the axial direction from the inner rolling surface, and a small diameter of the hub wheel An inner member consisting of an inner ring that is press-fitted into a stepped portion and has the other inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and both rolling of the inner member and the outer member A double row ball group accommodated in a rollable manner between the surfaces, and the pitch circle diameter of the outer side ball group of the double row ball group is larger than the pitch circle diameter of the inner side ball group In the method of manufacturing a wheel bearing device set to The end surface on the-side is simultaneously ground by the outer peripheral surface on the inner side that becomes the mating surface of the knuckle and the grinding wheel of the total type, and is regulated to a predetermined surface accuracy. The rolling surface is simultaneously ground by a general grinding wheel.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a longitudinal sectional view showing an embodiment of a wheel bearing device according to the present invention, FIG. 2 is an explanatory view showing a grinding process of the outer member of FIG. 1, and FIG. 3 is a modification of FIG. It is explanatory drawing shown.

  This wheel bearing device is for a driven wheel referred to as a third generation, and is a double row rolling element housed in a freely rollable manner between the inner member 1 and the outer member 2, and both members 1 and 2. (Ball) 3 and 4 groups. The inner member 1 includes a hub ring 5 and an inner ring 6 press-fitted into the hub ring 5 through a predetermined shimiro.

  The hub wheel 5 integrally has a wheel mounting flange 7 for attaching a wheel (not shown) to an end portion on the outer side, one (outer side) inner rolling surface 5a on the outer periphery, and this inner rolling. A small-diameter step portion 5b is formed through an axial portion 8 extending in the axial direction from the surface 5a. Hub bolts 7a are planted on the wheel mounting flange 7 in a circumferentially uniform manner, and circular holes 7b are formed between the hub bolts 7a. The circular hole 7b not only contributes to weight reduction, but also a fastening jig such as a wrench can be inserted from the circular hole 7b in the assembly / disassembly process of the apparatus, and the work can be simplified.

  The inner ring 6 is formed with the other (inner side) inner raceway surface 6a on the outer periphery and is press-fitted into the small-diameter stepped portion 5b of the hub wheel 5 to form a back-to-back type double row angular contact ball bearing. The end portion of 5b is fixed in the axial direction with a predetermined bearing preload applied by a caulking portion 5c formed by plastic deformation, thereby forming a so-called self-retain structure. The inner ring 6 and the rolling elements 3 and 4 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 portion by quenching.

  The hub wheel 5 is formed of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the inner raceway surface 5a and the base portion 7c on the inner side of the wheel mounting flange 7 to the small diameter step portion 5b. Thus, a predetermined curing treatment is applied to the surface hardness in the range of 58 to 64 HRC by induction hardening. The caulking portion 5c 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 7, the fretting resistance of the small-diameter step portion 5b serving as the fitting portion of the inner ring 6 is improved, and the minute There is no occurrence of cracks and the like, and the plastic working of the caulking portion 5c can be performed smoothly.

  The outer member 2 integrally has a vehicle body mounting flange 2c to be attached to the knuckle 9 on the outer periphery, and an outer outer rolling surface 2a facing the inner rolling surface 5a of the hub wheel 5 on the inner periphery, An inner side outer rolling surface 2b facing the inner rolling surface 6a of the inner ring 6 is integrally formed. Double row rolling elements 3 and 4 are accommodated between these rolling surfaces and are held by the cages 10 and 11 so as to be freely rollable. A seal 12 and a slinger 13 are respectively attached to the opening of the annular space formed between the outer member 2 and the inner member 1, and leakage of grease sealed inside the bearing to the outside, Prevents rainwater and dust from entering the bearing.

  The outer member 2 is formed of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the double row outer rolling surfaces 2a and 2b have a surface hardness of 58 to 64HRC by induction hardening described later. A predetermined hardened layer 14 is formed in the range (indicated by cross hatching in the figure). In addition, although what was comprised by the double row angular contact ball bearing which used the ball for the rolling elements 3 and 4 was illustrated here, not only this but the double row tapered roller which used the tapered roller for the rolling elements 3 and 4 You may be comprised with the bearing. In addition, the third generation structure on the driven wheel side is illustrated, but regardless of the driven wheel side or the drive wheel side, a body mounting flange is integrally formed on the outer periphery, and a double row outer rolling surface is formed on the inner periphery. Any second- to fourth-generation structure having an outer member may be used.

  In this embodiment, the pitch circle diameter PCDo of the outer side rolling element 3 group is set larger than the pitch circle diameter PCDi of the inner side rolling element 4 group. The sizes of the double-row rolling elements 3 and 4 may be the same, but here, the size of the outer-side rolling elements 3 is set smaller than the size of the inner-side rolling elements 4, and the outer The number of the rolling elements 3 on the side is set larger than the number of the rolling elements 4 on the inner side. As a result, the bearing space can be effectively utilized to reduce the weight and size, and the bearing rigidity of the outer side portion can be increased compared to the inner side, so that the life of the bearing can be extended.

  The outer ring of the hub wheel 5 has a counter part 15 from the groove bottom part of the inner rolling surface 5a, a shoulder part 8b against which the inner ring 6 is abutted from the counter part 15 via the shaft-like part 8 and the tapered step part 8a. And it is formed in the shape following the small diameter step part 5b. Further, a mortar-shaped recess 16 extending in the axial direction is formed at the outer side end of the hub wheel 5. The recess 16 is formed by forging, and the depth is at least near the groove bottom of the inner rolling surface 5a on the outer side. The recess 16 is formed along the outer shape of the hub wheel 5, and the hub The outer wall side of the ring 5 is formed to be substantially uniform.

  On the other hand, in the outer member 2, the outer side outer rolling surface 2a is formed with a larger diameter than the inner side outer rolling surface 2b due to the difference in pitch circle diameters PCDo and PCDi, and the outer side outer rolling surface 2b is formed. An annular recess 19 for weight reduction is formed between the shoulder portion 17 of the running surface 2a and the shoulder portion 18 of the outer side rolling surface 2b on the inner side which is the small diameter side.

  Here, in the present embodiment, the outer member 2 is forged from a bar material as a raw material, turned, and the end surface Fb after the double-row outer rolling surfaces 2a and 2b are subjected to high-frequency heat treatment. Is ground, and the double row outer rolling surfaces 2a, 2b are ground and superfinished.

Next, the grinding method of the outer member 2 will be described in detail with reference to FIG.
First, as shown in (a), the outer side end face Fa is brought into contact with the magnet chuck 20a, and the inner side outer peripheral surface 21 serving as the fitting surface of the knuckle (not shown) is supported by the shoe 22. The outer peripheral surface 21 and the inner end face Fb are simultaneously ground by the grinding wheel 23. It is regulated to a predetermined accuracy. Here, the grinding wheel 23 is composed of a general-purpose grindstone in which an outer peripheral grindstone 23a for grinding the outer peripheral surface 21 on the inner side and an end face grindstone 23b for grinding the end face Fb are integrally formed. Thereby, grinding can be performed efficiently without complicating the processing man-hours, and an increase in processing cost can be suppressed.

  Thereafter, as shown in (b), the grounded end surface Fb of the inner side is brought into contact with the magnet chuck 20b, and the outer peripheral surface 21 of the inner side is supported by the shoe 22 so that the double row outer rolling surface 2a is supported. 2b and the end inner peripheral surfaces 24a and 24b are simultaneously ground by the grinding wheel 25. Here, the grinding wheel 25 is a general type in which grooves 25a and 25b corresponding to the double row outer rolling surfaces 2a and 2b and inner peripheral wheels 25c and 25d corresponding to the end inner peripheral surfaces 24a and 24b are integrally formed. It consists of a grindstone.

  Thus, in the present embodiment, the outer peripheral surface 21 and the end surface Fb on the inner side are simultaneously ground by the general grinding wheel 23 and regulated to a predetermined accuracy, and the end surface Fb is brought into contact with the magnet chuck 20b. Since the double-row outer rolling surfaces 2a and 2b are simultaneously ground by the overall grinding wheel 25, the roundness and runout accuracy of the double-row outer rolling surfaces 2a and 2b are improved. It is possible to provide a wheel bearing device that can improve the bearing accuracy.

  In particular, as in this type of outer member 2, the double row outer rolling surfaces 2 a and 2 b having a groove diameter difference with a difference in pitch circle diameter become the reference surface from the left and right balance surface. Since the accuracy of the inner side end face Fb affects the roundness, runout accuracy, etc., the inner side outer peripheral surface 21 and the end face Fb are simultaneously ground by the grinding wheel 23 of the total type to improve the accuracy. It can be said that it is effective.

  FIG. 3 shows another grinding method for the outer member 2 described above. In addition, the same code | symbol is attached | subjected to the component same site | part or the site | part which has the same function as embodiment mentioned above, and detailed description is abbreviate | omitted. Here, in addition to the outer peripheral surface 21 and the end surface Fb on the inner side, the side surface 26 of the vehicle body mounting flange 2c serving as a mounting surface for a knuckle (not shown) is ground at the same time.

  That is, as shown in (a), the outer peripheral surface 21 is in a state where the outer end surface Fa is brought into contact with the magnet chuck 20a and the inner peripheral surface 21 serving as the fitting surface of the knuckle is supported by the shoe 22. The inner side end face Fb and the inner side face 26 of the vehicle body mounting flange 2 c are simultaneously ground by the grinding wheel 27. Here, the grinding wheel 27 is composed of a general-purpose grindstone in which an outer peripheral grindstone 23a for grinding the outer peripheral surface 21 on the inner side, an end face grindstone 23b for grinding the end face Fb, and a side face grindstone 27a for grinding the side face 26 are integrally formed. Thereby, grinding can be performed efficiently without complicating the processing man-hours, the surface accuracy of the vehicle body mounting flange 2c can be significantly improved, and misalignment can be suppressed.

  Thereafter, as shown in (b), the grounded end surface Fb of the inner side is brought into contact with the magnet chuck 20b, and the outer peripheral surface 21 of the inner side is supported by the shoe 22 so that the double row outer rolling surface 2a is supported. 2b and the end inner peripheral surfaces 24a and 24b are simultaneously ground by the grinding wheel 25. Here, the grinding wheel 25 is a general type in which grooves 25a and 25b corresponding to the double row outer rolling surfaces 2a and 2b and inner peripheral wheels 25c and 25d corresponding to the end inner peripheral surfaces 24a and 24b are integrally formed. It consists of a grindstone.

  As described above, in the present embodiment, the outer peripheral surface 21 and the end surface Fb on the inner side and the side surface 26 of the vehicle body mounting flange 2c are simultaneously ground by the general grinding wheel 27, and the end surface Fb is brought into contact with the magnet chuck 20b. Since the double-row outer rolling surfaces 2a and 2b are simultaneously ground by the grinding wheel 25 of the total type, the misalignment is suppressed and the trueness of the double-row outer rolling surfaces 2a and 2b is reduced. It is possible to provide a wheel bearing device that can improve the circularity and runout accuracy and improve the bearing accuracy.

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

  The wheel bearing device according to the present invention includes an outer member having a body mounting flange integrally formed on the outer periphery and having a double row outer rolling surface formed on the inner periphery, regardless of whether it is for driving wheels or driven wheels. The present invention can be applied to the wheel bearing device having the second to fourth generation structures provided.

It is a longitudinal section showing one embodiment of a wheel bearing device concerning the present invention. FIG. 2 is an explanatory view showing a grinding method of the outer member in FIG. 1, (a) shows a grinding method of an outer peripheral surface and an end surface on the inner side, and (b) shows a grinding method of a double row outer rolling surface. Yes. 2A and 2B are explanatory views showing a modified example of FIG. 2, in which FIG. 2A shows a grinding method for the outer peripheral surface and end face of the inner side and a side surface of the vehicle body mounting flange, and FIG. Show. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus. FIGS. 5A and 5B are explanatory views showing a grinding method of the outer member in FIG. 4, in which FIG. 4A shows a grinding method for the outer peripheral surface on the inner side, and FIG. 5B shows a grinding method for the double row outer rolling surface.

Explanation of symbols

1 .... Inner member 2 ... Outer member 2a, 2b ... Outer rolling surface 2c ... ... Car body mounting flanges 3, 4 ... Rolling elements 5 ... Hub wheels 5a, 6a ... Inner rolling surface 5b ... Small diameter step 5c ... Clamping part 6 ... Inner ring 7 ... ... Wheel mounting flange 7a ... Hub bolt 7b ... Round hole 7c ... Base 8 ... ... Shaft 8a ... Steps 8b, 17, 18 ... Shoulder 9 ... Knuckle 10, 11, ...・ ・ ・ ・ ・ Retainer 12 ・ ・ ・ ・ ・ Seal 13 ・ ・ ・ ・ ・ Slinger 14 ············································································ 20a, 20b ... Magnet chuck 21 ... Outer peripheral surface 22 on the inner side ... Shoes 23, 25, 27 ... Grinding wheel 23a ········································································································・ Inner peripheral grindstone 26... Inner side surface 27 a of the vehicle body mounting flange... 51... Outer member 51 a... Outer rolling surface 51 b... Outer rolling on the inner side Surface 51c ········ Body mounting flange 52 ·················· Hub wheels 52a, 54a ··· Inner rolling surface 52b ······· Small diameter Stepped portion 52c ·················································· Wheel mounting flange 54 ··· .... Inner members 56, 57 ... Balls 58, 59 ... Retainer 60, 61 ... Seal 62 ... Magnet chuck 63 ... Outer peripheral surface 64 on the inner side ... Support members 65, 66 ... Grinding wheel d1 ...・ ・ ・ ・ Groove diameter d2 of outer rolling surface on the outer side ・ ・ ・ ・ ・ ・ ・ ・ Groove diameter ds of outer rolling surface on the inner side ・ ・ ・ ・ ・ ・ ・ ・ Shoulder on the inner side Inside diameter Dc1 .... Outer diameter high frequency heating coil outer diameter Dc2 ... Inner side high frequency heating coil outer diameter D1 ... Outer side ball Pitch circle diameter D2 of the inner side ball Pitch circle diameter Fa of the outer member End face Fb of the outer member ... End surface PCDo on the inner side of the outer member ... Pitch circle diameter PCDi of the outer rolling element group ... Pitch circle diameter of the inner rolling element group

Claims (5)

An outer member integrally having a vehicle body mounting flange to be attached to the knuckle on the outer periphery, and a double row outer rolling surface formed on the inner periphery;
An inner member provided on the outer periphery with a double-row inner rolling surface facing the double-row outer rolling surface;
In the wheel bearing device including the inner member and a double row rolling element group accommodated in a freely rolling manner between both rolling surfaces of the outer member,
The wheel bearing device according to claim 1, wherein at least an inner end surface of the outer member is regulated to a predetermined surface accuracy by grinding.   2. The wheel bearing device according to claim 1, wherein a pitch circle diameter of an outer-side rolling element group in the double-row rolling element group is set larger than a pitch circle diameter of an inner-side rolling element group.   3. The wheel according to claim 1, wherein an outer peripheral surface on the inner side that serves as a fitting surface of the knuckle is simultaneously ground with an end surface on the inner side by a general grinding wheel, and is regulated to a predetermined surface accuracy. Bearing device.   The wheel bearing device according to any one of claims 1 to 3, wherein a side surface on the inner side of the vehicle body mounting flange is simultaneously ground with an end surface on the inner side by a grinding wheel of a total type, and is regulated to a predetermined surface accuracy. . An outer member integrally having a vehicle body mounting flange to be attached to the knuckle on the outer periphery, and a double row outer rolling surface formed on the inner periphery;
An inner member provided on the outer periphery with a double-row inner rolling surface facing the double-row outer rolling surface;
In the method of manufacturing a wheel bearing device comprising the inner member and a double row rolling element group accommodated in a freely rolling manner between both rolling surfaces of the outer member,
At least the inner end face of the outer member end faces and the outer peripheral face of the inner side that becomes the fitting surface of the knuckle are ground to a predetermined surface accuracy by a general grinding wheel, and the inner end face is A method for manufacturing a wheel bearing device, wherein the double-row outer rolling surfaces as a reference surface are simultaneously ground by a general grinding wheel.

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