JP4627017B2 - Wheel bearing device - Google Patents

Description

  The present invention relates to a wheel bearing device that rotatably supports a wheel of an automobile or the like.

  An example of this type of wheel bearing device (for example, Patent Document 1) is shown in FIG. This wheel bearing device is of the double-row outward angular ball bearing type classified as the first generation, and is opposed to the outer ring 21 having the double-row raceway surface 24 on the inner periphery and the raceway surfaces 24 respectively. An inner ring 22 having a raceway surface 25 and a double row ball 23 interposed between the double row raceway surfaces 24 and 25 are provided. The inner ring 22 has two individual inner rings 22A arranged in the axial direction, and the balls 23 are held by the holders 26 for each row. Both ends of the annular space formed between the outer ring 21 and the inner ring 22 are sealed with a pair of seals 27 and 28.

As described above, in the wheel bearing device using the ball as the rolling element, a non-separation structure in which the inner ring is not separated is adopted during the conveyance and in the assembly process of the automobile manufacturer. In the case of the wheel bearing device, as a non-separating structure,
(1) The outer ring 21 and the inner ring 22 are provided with counter bore portions 29 and 30 that are adjacent to the raceway surfaces 24 and 25 and protrude from the groove bottom diameter of the raceway surfaces 24 and 25, and are interposed between the raceway surfaces 24 and 25. The counter bores 29 and 30 prevent the ball 23 from being pulled out in the axial direction.
As another example of the non-separation structure of the wheel bearing device,
(2) A counter bore portion is provided on the outer ring, and a claw provided on the inner diameter surface of the cage is engaged with the inner ring and non-separated by interposing a ball,
(3) Non-separated by stopping two individual inner rings constituting the inner ring side by side with the connecting ring in the axial direction;
Etc. are also known. Among these non-separated structures, the structures (1) and (2) are widely adopted from the viewpoints of economy and assemblability.

In order to adopt the non-separated structure of (1) and (2) above, it is an indispensable condition to provide a counterbore portion protruding from the groove bottom diameter on the outer ring. In this case, in the bearing assembly process, the ball and cage assembly passes through the outer ring counter bore portion and is inserted into the bearing race portion. That is, in the case of the wheel bearing device of FIG. 9, the bearing assembly process is as follows.
a) Insert the assembly of the ball 23 and the cage 26 into the inner surface of the outer ring 21.
b) Insert the bearing inner ring 22A.
c) Enclose grease.
d) Press-fit the seals 27 and 28.
Japanese Patent Laid-Open No. 10-260195

  By the way, when the ball and cage assembly is inserted into the inner surface of the outer ring 21 in the bearing assembly process, the ball 23 passes through the counter bore portion 29 of the outer ring 21 as shown in an enlarged view in FIG. Since the inner diameter surface 29a of the counterbore part 29 is a turning process, a processing mark remains. As a result, when the ball 23 passes through the counter bore inner diameter surface 29a having a turning mark, a scratch may occur on the ball surface. This damage is harmful to the raceway during rotation of the bearing and causes a short bearing life.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a wheel bearing device capable of extending the bearing life by preventing the ball from being scratched during assembly while having a non-separation structure in which the inner ring is not separated from the outer ring during transportation and handling. Is to provide.

Wheel support bearing assembly of the present invention, between the raceway surfaces of the double row inner and outer rings, is a double row outward angular contact ball bearing type, which is interposed a ball double row outer ring end of orbital plane of each row of the outer ring each contact next to part side, the wheel bearing apparatus having a counter bore portion inner surface is projected on the inner diameter side than the groove bottom diameter of the outer ring raceway surface, the inner surface of the counter bore and grinding surface, the The outer ring has a seal mounting surface larger in diameter than the groove bottom diameter of the outer ring raceway surface on the outer ring end side of the counter bore portion on the inner diameter surface, and the inner diameter of the groove portion of the seal mounting surface side the counter bore portion is found protrude into, there is a chamfer between the inner surface of the counterbore portion and the outer end portion side surface of the counter bore portion, before Symbol groove is an unground surface , the inner diameter surface of the counter bore portion of the outer ring and said chamfered portion , Which was co-ground with different parts of the same grinding wheel as the track surface, and the seal mounting surface, an outer diameter surface of the inner ring, respectively in the column between the side of the double row of orbital plane of each row of the inner ring next to contact with the ball that mediate counterbore portion protruding radially outward than the groove bottom diameter of the raceway surface setting only, with a counter bore and the inner ring of the counterbore portion of the outer ring, between the raceway surfaces of the inner and outer rings outer race but is prevented to be pulled out in the axial direction, before Symbol ball is held by the retainer for each column, the assembly is composed of a plurality of balls the retainer, this assembly is raceway surface of the outer ring Inserted into the raceway surface of each row from the end side, the ball passes through the counterbore portion while rubbing against the inner diameter surface of the counterbore portion of the outer ring, and the assembly is inserted into the raceway surface of each row. And the inner ring is inserted into the outer ring into which the assembly is inserted. Characterized in that but is inserted.
According to this configuration, since the counterbore portion protrudes toward the inner diameter side of the groove bottom diameter of the outer ring raceway surface, a non-separation structure in which the inner ring is not separated from the outer ring can be achieved. The counterbore part protrudes to the inner diameter side of the groove bottom diameter of the outer ring raceway surface, but the inner diameter surface of the counterbore part is a grinding surface and there are no turning traces. It is possible to prevent the ball from being scratched by inserting the instrument assembly. For this reason, it is possible to avoid shortening the service life of the wheel bearing device due to the balls that are scratched during assembly.

Before Kigairin is the end side of the counter bore portion of the inner surface, and has a sealing mounting surface having a diameter larger than the inner diameter of the counterbore section. The inner diameter surface of the counter bore portion of the outer ring, in which the raceway surface, and was simultaneous grinding in each part of the same grinding wheel as the seal mounting surfaces.
In this way, when the inner diameter surface of the outer ring counterbore portion is ground simultaneously with the raceway surface and the seal mounting surface, it is possible to avoid the occurrence of misalignment of the shaft center between the surfaces during grinding. The accuracy between each other is increased. Further, since simultaneous grinding is performed, it is not necessary to add a dedicated processing step to grind the inner diameter surface of the outer ring counterbore portion, so that an increase in cost can be suppressed.

The wheel bearing device manufacturing method according to the present invention includes a double-row outward angular ball bearing type wheel bearing device in which double-row balls are interposed between the double-row raceway surfaces of the inner and outer rings . in contact next to the outer ring end portion side of the orbital plane, respectively, has a counterbore portion inner surface is projected on the inner diameter side than the groove bottom diameter of the outer ring raceway surface, wherein on the end side than the counter bore portion than the groove bottom diameter of the outer ring raceway surface has a sealing mounting surface of the large diameter, the said counter bore on the inner diameter side of the groove of the seal mounting surface is found protrudes, the radially inner surface of the counter bore portion There is a chamfered portion between the outer ring end portion side surface of the counter bore portion, before Symbol groove is an unground surface, an inner diameter surface of the counter bore portion of the outer ring, the chamfered portion, orbital plane, and the seal mounting surface is the grinding surface, an outer diameter surface of the inner ring, the trajectory of each row of the inner ring A counter bore portion that protrudes to the outer diameter side of the groove bottom diameter of the raceway surface is provided adjacent to the inter-row side of the double row, and the counter bore portion of the outer ring and the counter bore portion of the inner ring a method of manufacturing a wheel bearing device ball interposed between ring raceway is prevented to be pulled out in the axial direction, the inner diameter surface of the counter bore, the chamfered portion, orbital plane, and the seal a mounting surface, and simultaneously grinding the parts of the same grinding wheel, before Symbol ball is held by the retainer for each column, the assembly is composed of a plurality of balls the retainer, this assembly, the trajectory of the outer ring It is inserted into the raceway surface of each row from the outer ring end side of the surface, the ball passes through the counterbore portion while rubbing against the inner diameter surface of the counterbore portion of the outer race, and the assembly passes through the raceway of each row. Inserted into the surface, the assembly There wherein the inner ring is inserted into the inserted outer ring.
According to this method, it is possible to manufacture a wheel bearing device that can prevent the ball from being scratched during assembly and increase the life of the bearing while having a non-separable structure in which the inner and outer rings are not separated. A high accuracy can be obtained between the faces, and it is not necessary to add a dedicated processing step as a step of grinding the inner diameter surface of the outer ring counterbore portion, thereby suppressing an increase in cost.

Wheel support bearing assembly of the present invention, between the raceway surfaces of the double row inner and outer rings, is a double row outward angular contact ball bearing type, which is interposed a ball double row outer ring end of orbital plane of each row of the outer ring each contact next to part side, the wheel bearing apparatus having a counter bore portion inner surface is projected on the inner diameter side than the groove bottom diameter of the outer ring raceway surface, the inner surface of the counter bore and grinding surface, the The outer ring has a seal mounting surface larger in diameter than the groove bottom diameter of the outer ring raceway surface on the outer ring end side of the counter bore portion on the inner diameter surface, and the inner diameter of the groove portion of the seal mounting surface side the counter bore portion is found protrude into, there is a chamfer between the inner surface of the counterbore portion and the outer end portion side surface of the counter bore portion, before Symbol groove is an unground surface , the inner diameter surface of the counter bore portion of the outer ring and said chamfered portion , Which was co-ground with different parts of the same grinding wheel as the track surface, and the seal mounting surface, an outer diameter surface of the inner ring, respectively in the column between the side of the double row of orbital plane of each row of the inner ring next to contact with the ball that mediate counterbore portion protruding radially outward than the groove bottom diameter of the raceway surface setting only, with a counter bore and the inner ring of the counterbore portion of the outer ring, between the raceway surfaces of the inner and outer rings outer race but is prevented to be pulled out in the axial direction, before Symbol ball is held by the retainer for each column, the assembly is composed of a plurality of balls the retainer, this assembly is raceway surface of the outer ring Inserted into the raceway surface of each row from the end side, the ball passes through the counterbore portion while rubbing against the inner diameter surface of the counterbore portion of the outer ring, and the assembly is inserted into the raceway surface of each row. And the inner ring is inserted into the outer ring into which the assembly is inserted. There for insertion, while the non-isolated structure inner ring during transportation and handling are not separated, the ball of abrasion occurs is prevented during assembly, it is possible to bearing long life.
The wheel bearing device manufacturing method according to the present invention includes a double-row outward angular ball bearing type wheel bearing device in which double-row balls are interposed between the double-row raceway surfaces of the inner and outer rings . in contact next to the outer ring end portion side of the orbital plane, respectively, has a counterbore portion inner surface is projected on the inner diameter side than the groove bottom diameter of the outer ring raceway surface, wherein on the end side than the counter bore portion than the groove bottom diameter of the outer ring raceway surface has a sealing mounting surface of the large diameter, the said counter bore on the inner diameter side of the groove of the seal mounting surface is found protrudes, the radially inner surface of the counter bore portion There is a chamfered portion between the outer ring end portion side surface of the counter bore portion, before Symbol groove is an unground surface, an inner diameter surface of the counter bore portion of the outer ring, the chamfered portion, orbital plane, and the seal mounting surface is the grinding surface, an outer diameter surface of the inner ring, the trajectory of each row of the inner ring A counter bore portion that protrudes to the outer diameter side of the groove bottom diameter of the raceway surface is provided adjacent to the inter-row side of the double row, and the counter bore portion of the outer ring and the counter bore portion of the inner ring a method of manufacturing a wheel bearing device ball interposed between ring raceway is prevented to be pulled out in the axial direction, the inner diameter surface of the counter bore, the chamfered portion, orbital plane, and the seal a mounting surface, and simultaneously grinding the parts of the same grinding wheel, before Symbol ball is held by the retainer for each column, the assembly is composed of a plurality of balls the retainer, this assembly, the trajectory of the outer ring It is inserted into the raceway surface of each row from the outer ring end side of the surface, the ball passes through the counterbore portion while rubbing against the inner diameter surface of the counterbore portion of the outer race, and the assembly passes through the raceway of each row. Inserted into the surface, the assembly Since the inner ring is inserted into the outer ring into which the inner ring is inserted, the wheel bearing has a non-separable structure in which the inner and outer rings are not separated, but the ball is prevented from being scratched during assembly and the bearing life can be extended. The apparatus can be manufactured, high accuracy can be obtained between each surface of the outer ring, and it is not necessary to add a dedicated processing step as a step of grinding the inner diameter surface of the outer ring counterbore portion, thereby suppressing an increase in cost.

  A first embodiment of the present invention will be described with reference to FIGS. The wheel bearing device A of this embodiment is of the double-row outward angular ball bearing type classified as the first generation. This wheel bearing device A includes an outer ring 1 having a double row raceway surface 4 on an inner periphery, an inner ring 2 having a raceway surface 5 facing each of the raceway surfaces 4, and the double row raceway surfaces 4, 5. And a double row of balls 3 interposed therebetween. The inner ring 2 is formed by arranging two individual inner rings 2A in the axial direction. The balls 3 are held by the cage 6 for each row. Both ends of the annular space formed between the inner and outer rings 2 and 1 are sealed with a pair of seals 7 and 8.

  On the inner diameter surface of the outer ring 1, a counter bore portion 9 is provided adjacent to the raceway surface 4 of each row and protrudes from the bottom diameter of the raceway surface 4 toward the inner diameter side. A counter bore portion 39 is provided adjacent to the raceway surface 5 and projecting to the outer diameter side from the bottom diameter of the raceway surface 5. The counter bore portions 9 and 39 are stepped portions that protrude to the inner diameter side or the outer diameter side from the counter bore portions having the same diameter as the groove bottoms of the raceway surfaces 4 and 5 provided in a general angular contact ball bearing. It is provided. These counter bore portions 9 and 39 prevent the balls 3 interposed between the raceway surfaces 4 and 5 from being pulled out in the axial direction.

FIG. 2 shows an enlarged view of the left end side of the outer ring 1 in FIG. In the figure, the radially inner surface 9a of the counterbore portion 9 of the outer ring 2 that is the grinding surface. A chamfered portion 9b is provided between the inner diameter surface 9a of the counter bore portion 9 and the surface of the counter bore portion 9a on the outer ring end side. On the end side than the counter bore 9 in the inner diameter surface of the outer ring 1, than the inner diameter of the counter bore portion 9 sealing mounting surface 1a of the large diameter is formed, the seal on these sealing mounting surface 1a 7,8 are attached. That is, in FIG. 2, the counter bore portion 9 on the left column side is provided as a shoulder portion protruding toward the inner diameter side of the groove portion 1aa of the seal mounting surface 1a. Although the enlarged view of the relationship between the counter bore portion 9 on the right column side and the seal mounting surface 1a is omitted, the structure is the same as that on the left column side.

  1 includes a seal member 8A and a slinger 8B in which the seal member 8A is in sliding contact, and the seal member 8A is attached to the seal attachment surface 1a of the outer ring 1. The slinger 8B is attached to the outer diameter surface of the bearing inner ring 2A, and a magnetic encoder 40 for detecting rotation is integrally provided.

  The wheel bearing device A having this configuration prevents the balls 3 interposed between the raceway surfaces 4 and 5 from being pulled out in the axial direction by the counter bore portions 9 and 39 of the outer and inner rings 1 and 2 as described above. Thus, a non-separation structure in which the inner ring 2 is not separated from the outer ring 1 in the course of conveyance and in the assembly process of the automobile manufacturer is obtained.

  In the assembly of the wheel bearing device A, the assembly of the ball 3 and the cage 6 is inserted into the raceway surface 4 of each row of the outer ring 1, and then each bearing inner ring 2A corresponding to each row is inserted. Next, after sealing the grease, the seals 7 and 8 are press-fitted. In the insertion of the ball and cage assembly in this assembly process, the ball 3 passes through the counterbore portion 9 of the outer ring 1 as shown in FIG. 3 showing an example of insertion from the left end side of the outer ring 1. At this time, as shown in FIG. 4 which is an enlarged view of a part of FIG. 3, the inner diameter surface 9 a of the counterbore portion 9 is a grinding surface and there is no turning processing trace. It can be prevented from occurring. As described above, since it is possible to eliminate the occurrence of scratches on the balls 3 in the assembly process, it is possible to avoid shortening the life of the bearing device A due to the scratches on the balls 3.

FIG. 5 shows an example of a processing method in which the inner diameter surface 9a of the counterbore portion 9 of the outer ring 1 is a ground surface. In this processing method, the inner diameter surface 9a and the chamfered portion 9b of the counterbore portion 9 of the outer ring 1 are simultaneously ground together with the raceway surface 4 and the seal mounting surface 1a at each portion of the same grindstone 20. The grindstone 20 has an outer diameter surface having a cross-sectional shape along the finished cross-sectional shape of each of the surfaces 9a, 4, 1a. In this way, by simultaneously grinding the inner diameter surface 9a of the counterbore portion 9 together with the raceway surface 4 and the seal mounting surface 1a with the same grindstone 20, the shafts between the surfaces 9a, 4 and 1a can be connected to each other during grinding. It is possible to avoid the shift of the center and the like, and the accuracy between the surfaces 9a, 4 and 1a is increased. Moreover, according to the simultaneous grinding, it is not necessary to add a dedicated processing step for grinding the inner diameter surface 9a of the counterbore part 9, and it is possible to suppress an increase in cost.

  FIG. 6 shows another embodiment of the present invention. This wheel bearing device B is a double-row outward angular contact ball bearing type classified as the second generation, and is an outer ring rotating type and for supporting a driven wheel. The wheel bearing device B includes an outer ring 1 serving as a hub ring having double-row raceway surfaces 4 on an inner periphery, an inner ring 2 having raceway surfaces 5 respectively opposed to the raceway surfaces 4, and these double-row raceway surfaces. And double-row balls 3 interposed between four and five. The outer ring 1 has a wheel mounting flange 1b on the outer periphery. In assembly to the vehicle, the flange 1b is provided with a hub bolt 13 press-fitted in the bolt insertion hole 12 and a hub nut (not shown) screwed into the hub bolt 13 so that the brake rotor and wheels ( (None of them are shown in the figure). The inner ring 2 is formed by arranging two individual inner rings 2A in the axial direction as in the previous embodiment. An axle (not shown) is fixed to the inner diameter surface of the inner ring 2. The balls 3 are held by the cage 6 for each row. Both ends of the annular space formed between the inner and outer rings 2 and 1 are sealed with a pair of seals 7 and 8.

  Also in this wheel bearing device B, as an inner ring non-separating structure, a counter bore portion 9 is provided adjacent to the raceway surface 4 of each row of the outer race 1 and projecting to the inner diameter side of the groove bottom diameter of the raceway surface 4. Further, adjacent to the raceway surface 5 of each row of the inner ring 2, a counter bore portion 39 is provided that projects to the outer diameter side from the groove bottom diameter of the raceway surface 5. The inner diameter surface of the counter bore portion 9 of the outer ring 1 is the ground surface as in the embodiment of FIG.

  FIG. 7 shows still another embodiment of the present invention. The wheel bearing device C of this embodiment is a double-row outward angular contact ball bearing type classified as the third generation, and is an inner ring rotating type and for driving wheel support. This wheel bearing device C includes an outer ring 1 having a double row raceway surface 4 on an inner periphery, an inner ring 2 having a raceway surface 5 opposed to each raceway surface 4, and the raceway surfaces 4 of these inner and outer rings 2, 1. , 5 and a double row of balls 3 interposed between them. The balls 3 are held by the cage 6 for each row. Both ends of the bearing space between the inner and outer rings 2 and 1 are sealed by seals 7 and 8, respectively.

  The outer ring 1 is a member on the fixed side and has a vehicle body mounting flange (not shown) on the outer periphery, and the vehicle body mounting flange is fastened with a bolt (none of which is shown) to a knuckle installed on the vehicle body. Is done. The inner ring 2 is a member on the rotation side, and includes a hub ring 10 having a wheel mounting flange 10a on the outer periphery, and an individual inner ring 11 fitted to the outer periphery of the inboard side end of the hub wheel 10. . Outboard side raceway surfaces 5 of the double row raceway surfaces 5 are formed on the hub wheel 10, and inboard side row raceway surfaces 5 are formed on the inner ring unit 11. The hub wheel 10 has an inner ring fitting surface 10b formed as a step portion on the outer periphery of the inboard side end, and the individual inner ring 11 is fitted to the inner ring fitting surface 10b. The flange 10a of the hub wheel 10 includes a hub bolt 13 press-fitted into the bolt insertion hole 12 and a hub nut (not shown) screwed into the hub bolt 13 so that the brake rotor and wheels of the brake device (both not shown). ) And are attached in layers.

  The hub wheel 10 has a center hole 19, and a stem portion 15 a of an outer ring 15 which is one joint member of the constant velocity joint 14 is inserted into the center hole 19 and is spline-fitted, and is screwed to the tip of the stem portion 15 a. By tightening the nut 16 to be joined, the constant velocity outer outer ring 15 is coupled to the inner ring 2. At this time, the step surface 15 b facing the outboard side provided in the constant velocity joint outer ring 15 is pressed against the end surface 11 a facing the inboard side of the inner ring alone 11, and the inner ring 2 is formed by the constant velocity joint outer ring 15 and the nut 16. It is tightened.

  In the wheel bearing device C, the ball and cage assembly inserted into the outer ring 1 is adjacent to the raceway surface 4 of each row of the outer ring 1 so that the ball and cage assembly does not fall off from the outer ring 1 in the bearing assembly process. A counter bore portion 9 is provided that protrudes toward the inner diameter side of the groove bottom diameter. The inner diameter surface of the counter bore portion 9 of the outer ring 1 is the ground surface as in the embodiment of FIG.

  FIG. 8 shows still another embodiment of the present invention. The wheel bearing device D of this embodiment is a double-row outward angular contact ball bearing type classified as the fourth generation, and is an inner ring rotating type and for driving wheel support. The wheel bearing device D includes an outer ring 1 having a double row raceway surface 4 on an inner periphery, an inner ring 2 having a raceway surface 5 opposed to each raceway surface 4, and the raceway surfaces 4 of the inner and outer rings 2, 1. , 5 and a double row of balls 3 interposed between them. The balls 3 are held by the cage 6 for each row. Both ends of the bearing space between the inner and outer rings 2 and 1 are sealed by seals 7 and 8, respectively.

The outer ring 1 is a member on the fixed side, and has a vehicle body mounting flange 1c on the outer periphery, and a vehicle body mounting flange 1c by a knuckle bolt (not shown) penetrating the bolt insertion hole 17 of the vehicle body mounting flange 1c. Is fastened to a knuckle (not shown) installed on the vehicle body.
The inner ring 2 is a member on the rotation side, and has a hub wheel 10 having a wheel mounting flange 10a at an end on the outboard side, and a constant velocity joint that is inserted into and fitted in the central hole 19 of the hub wheel 10. It consists of an outer ring 15. Outboard side raceway surfaces 5 of the double row raceway surfaces 5 are formed on the hub wheel 10, and inboard side row raceway surfaces 5 are formed on the constant velocity joint outer ring 15. The flange 10a of the hub wheel 10 includes a hub bolt 13 press-fitted and fixed to the bolt insertion hole 12 and a hub nut (not shown) that is screwed into the hub bolt 13 so that the brake rotor and wheels of the brake device (both not shown). )) Are stacked and attached.

  Also in the wheel bearing device D, the ball and cage assembly inserted into the outer ring 1 as in the wheel bearing device C is provided on the raceway surface 4 of each row of the outer ring 1 so that it does not fall off from the outer ring 1 in the bearing assembly process. Adjacent to the groove bottom diameter of the raceway surface 4 is provided a counter bore portion 9 that protrudes to the inner diameter side. The inner diameter surface of the counter bore portion 9 of the outer ring 1 is the ground surface as in the embodiment of FIG.

It is sectional drawing of the wheel bearing apparatus concerning 1st Embodiment of this invention. It is an expanded sectional view of the one end part of the outer ring in the bearing device for the wheels. It is explanatory drawing of ball | bowl and cage assembly insertion to the outer ring | wheel in the assembly process of the bearing apparatus for wheels. FIG. 4 is a partially enlarged sectional view of FIG. 3. It is explanatory drawing of the grinding method of the counter bore part inner surface. It is sectional drawing of the wheel bearing apparatus concerning other embodiment of this invention. It is sectional drawing of the wheel bearing apparatus concerning other embodiment of this invention. It is sectional drawing of the wheel bearing apparatus concerning other embodiment of this invention. It is sectional drawing of a prior art example. It is explanatory drawing of ball | bowl and holder | retainer assembly insertion to the outer ring | wheel in the assembly process of the prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Outer ring 1a ... Seal mounting surface 4 ... Outer ring raceway surface 9: Counter bore portion 9a ... Inner diameter surface 20 of counter bore portion ... Grinding wheel

Claims (2)

Between raceways double row inner and outer rings, is a double row outward angular contact ball bearing type, which is interposed a ball double row, contact adjacent the respective outer end portions of the orbital plane for each column of the outer ring, the inner diameter In a wheel bearing device having a counter bore portion whose surface projects to the inner diameter side of the groove bottom diameter of the outer ring raceway surface, the inner diameter surface of the counter bore portion is a ground surface, and the outer ring is the counter bore portion on the inner diameter surface. A seal mounting surface having a diameter larger than the groove bottom diameter of the outer ring raceway surface on the outer ring end portion side than the portion, and the counter bore portion projects to the inner diameter side of the groove portion of the seal mounting surface. It provided al is, there is a chamfered portion between the inner surface of the counterbore portion and the outer end portion side surface of the counter bore portion, before Symbol groove is an unground surface, an inner diameter of the counter bore portion of the outer ring surface and the chamfered portion and is raceways, and seal mounting Has been co-ground with different parts of the same grinding wheel and the surface,
The outer diameter surface of the inner ring, respectively in the column between the side of the double row of orbital plane of each row of the inner ring in contact with neighboring, set the counter bore portion protruding radially outward than the groove bottom diameter of the raceway surface The ball interposed between the raceway surfaces of the inner and outer rings is prevented from being pulled out in the axial direction by the counterbore part of the outer ring and the counterbore part of the inner ring,
Before Symbol ball is held by the retainer for each column, the assembly between a plurality of balls the retainer is formed, the assembly is inserted from the outer end side of the raceway surface of the outer ring raceway surface of each column The ball passes through the counter bore while rubbing against the inner diameter surface of the counter bore portion of the outer ring, the assembly is inserted into the raceway surface of each row, and the inner ring is inserted into the outer ring into which the assembly is inserted. A bearing device for a wheel, characterized in that is inserted. Between raceway surfaces of the double row inner and outer rings, the bearing device for a wheel double row outward angular contact ball bearing type, which is interposed a ball double row, next to each of the outer end side of the orbital plane of each row of the outer ring In contact with the counter bore portion, the inner diameter surface of which protrudes toward the inner diameter side of the groove bottom diameter of the outer ring raceway surface, the end bore side of the counter bore portion being larger than the groove bottom diameter of the outer ring raceway surface . has a seal mounting surface, the said counter bore on the inner diameter side of the groove of the seal mounting surface is found protrudes, the radially inner surface of the counterbore portion and the surface of the outer ring end portion side of the counter bore portion There is a chamfered portion between the front Symbol groove is an unground surface, an inner diameter surface of the counter bore portion of the outer ring, the chamfered portion, orbital plane, and the seal mounting surface is the grinding surface, said inner ring Adjacent to the inter-row side of the double row of the raceway surface of each row of the inner ring. A counter bore projecting outward from the groove bottom diameter of the raceway surface is provided, and the ball interposed between the raceway surfaces of the inner and outer rings is pulled out in the axial direction between the counter bore portion of the outer ring and the counter bore portion of the inner ring. a method of manufacturing a possible wheel bearing device is prevented to escape, inner diameter surface of the counter bore, the chamfered portion, orbital surface, and a seal mounting surfaces, co-grinding in each part of the same grindstone ,
Before Symbol ball is held by the retainer for each column, the assembly between a plurality of balls the retainer is formed, the assembly is inserted from the outer end side of the raceway surface of the outer ring raceway surface of each column The ball passes through the counter bore while rubbing against the inner diameter surface of the counter bore portion of the outer ring, the assembly is inserted into the raceway surface of each row, and the inner ring is inserted into the outer ring into which the assembly is inserted. A method for manufacturing a wheel bearing device, wherein a wheel is inserted.

Images