JP2008014448A - Wheel bearing device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel bearing device which prevents the come-off of an inner ring in the processes of assembly on a vehicle without giving ill effects to the bearing function, while improving the air tightness and mud water resistance of a bearing space without causing the distortion of a seal member which seals the bearing space between the inner ring and an outward member by diameter-enlarging and fastening a hub ring to prevent the come-off of the inner ring. <P>SOLUTION: A stepped portion 16 is provided on the inner peripheral edge of the inboard side end face of the inner ring 10, and a fastened portion 9c is provided on the outer periphery of the inboard side end of the hub ring 9 for engaging with an axially stepped face 16b of the stepped portion 16 of the inner ring 10 by diameter-enlarging and fastening work. The bearing space between the inner ring 10 and the outward member 1 is sealed by the seal member 8 pressed into the outer periphery of the inboard side end of the inner ring 10. The seal member 8 is fitted to the inner ring 10 after the diameter-enlarging and fastening work for the fastened portion 9c. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wheel bearing device that rotatably supports a wheel of an automobile or the like, and a manufacturing method thereof.

  Conventionally, what is shown in FIG. 9 is proposed as a wheel bearing device for driving wheel support (for example, patent document 1). This is because the rolling elements 35 made of balls are interposed between the opposing raceway surfaces 33, 34 of the outer member 31 and the inner member 32 in a double row, and the inner member 32 is surrounded by the wheel mounting hub flange 39a. And the inner ring 40 fitted to the outer periphery of the inboard side end of the hub ring 39. The stem portion 43a of the outer ring 43 of the constant velocity joint is inserted into the through hole 41 in the center of the hub wheel 39 and is spline-fitted, and the step surface 43b of the outer ring 43 of the constant velocity joint is connected to the inboard side end surface 40a of the inner ring 40. Pressed. In this state, the inner member 32 is tightened by the constant velocity joint outer ring 43 and the nut 44 by screwing the nut 44 into the distal end of the stem portion 43a.

In this proposed example, the inner ring 40 is fitted on a stepped inner ring fitting portion 45 formed on the outer circumference of the inboard side end portion of the hub wheel 39, and a step is formed on the inner circumference of the inboard side end portion of the inner ring 40. A portion 46 is formed, and the inboard side end of the hub wheel 39 is expanded and deformed to the outer diameter side, and the stepped portion 46 of the inner ring 40 is crimped. As a result, the inner ring 40 is prevented from coming off due to an external force generated during assembly to the vehicle.
JP-A-9-164803

However, the above-described wheel bearing device has the following problems.
(1) Since the caulking portion 39c of the hub wheel 39 is large, the radial step of the step portion 46 formed at the inboard side end portion of the inner ring 40 as shown in FIG. The radius difference needs to be about 5 to 7 mm. When the level difference of the stepped portion 46 is increased in this way, the area of the inboard side end surface 40a of the inner ring 40 is reduced, so that the contact surface pressure with the stepped surface 43b of the constant velocity joint outer ring 43 is increased. Therefore, it causes wear and abnormal noise.
(2) If the caulking portion 39c of the hub wheel 39 is to be stored inside (outboard side) from the inboard side end of the inner ring 40, the axial length of the stepped portion 46 of the inner ring 40 is set to 7 as shown in FIG. It needs to be about ~ 8mm. As described above, when the axial length of the inner ring stepped portion 46 increases, the inner ring stepped portion 46 tends to be positioned on the extension line L of the rolling element contact angle θ, and the inner ring deformation due to a load load during operation increases. There is a possibility of short life. Further, when the axial length of the inner ring stepped portion 46 is increased, the fitting length (area) of the inner ring 40 with respect to the hub ring 39 is reduced accordingly, so that inner ring creep occurs and the bearing life may be reduced. . These problems can be avoided by increasing the width of the entire inner ring 40, but this requires extra space in the width direction.
(3) Since the caulking portion 39c of the hub wheel 39 is large, the caulking punch interferes with the inner ring 40 in swing caulking and pressurization, and machining is difficult.

  In order to solve such a problem, an attempt was made to make the stepped portion 46 of the inner ring 40 shallow with a depth corresponding to the inner peripheral surface of the inner ring end surface 40a. Even if the stepped portion 46 is shallow, sufficient resistance against pulling force acting when the bearing is assembled to the vehicle can be obtained.

  When the caulking portion 39c is used for such a small stepped portion 46, it can be plastically deformed by a relatively simple method by press work, without using swing caulking. In that case, for example, as shown in FIG. 11, the bearing device is fixed in a posture in which the inboard side faces upward, and in this state, the caulking punch 19 is lowered onto the inboard side end of the hub wheel 39, and the hub The caulking portion 39c of the ring 39 is expanded in diameter over the entire circumference.

  However, in the diameter-enlarged caulking by the above press working, while the caulking punch 19 is in contact with the inboard side end of the hub wheel 39, the outer diameter seal press-fitting portion 40b of the inner ring 40 is also expanded, and the caulking punch 19 is moved to the hub. At the moment of separation from the wheel 39, the seal press-fitting portion 40b contracts. For this reason, when caulking is performed in a state where the sealing means 38 is press-fitted between the outer member 31 and the inner ring 40, the thin cored bar 38aa of the sealing member 38a attached to the inner ring 40 side of the sealing means 38 is applied. The strain remains, the tightening allowance with the inner ring 40 is reduced, and the airtightness and mud water resistance are lowered. 11 includes the first seal member 38a fitted to the outer periphery of the inner ring 40 and the second seal member 38b fitted to the inner periphery of the outer member 31. The metal core 38aa of the sealing member 38a is a slinger.

  In order to ensure airtightness, the initial tightening allowance of the seal member 38a may be increased. However, if the seal member 38a is too large, a problem may occur in the seal member 38a due to distortion during press-fitting. Therefore, it is necessary to take into account the tightness of the parts in consideration of airtightness and twisting at the time of press-fitting, leading to an increase in cost.

  The object of the present invention is to prevent the inner ring from coming off in the assembly process to the vehicle without adversely affecting the bearing function, and the inner ring and the outer member can be obtained by expanding the diameter of the hub ring to prevent the inner ring from coming off. It is to provide a wheel bearing device having good airtightness and muddy water resistance of the bearing space and a manufacturing method thereof without causing distortion in a seal member that seals the bearing space between the bearing space and the bearing member.

The wheel bearing device according to the present invention includes an outer member having a double-row raceway surface on an inner periphery, an inner member having an outer periphery raceway surface facing each of the raceway surfaces, and the facing raceway surface. The inner member is provided on the outer periphery of an inboard side portion of the hub wheel and a hub wheel having a flange for mounting the axle on the outer periphery and a through hole in the center. It is an inner ring fitted to a stepped inner ring fitting part, has the raceway surface in each row on the hub ring and the inner ring, and has a stepped part on the inner peripheral edge of the end face on the inboard side of the inner ring, A bearing between the inner ring and the outer member is provided on the outer periphery of the end of the inboard side of the hub ring by expanding and crimping to engage a step surface facing the axial direction of the step portion of the inner ring. The space is sealed with a seal member press-fitted into the outer periphery of the inboard side end of the inner ring.
In this wheel bearing device, the seal member is fitted to the inner ring after the diameter-enlarged caulking process of the caulking portion.

In the wheel bearing device of the present invention, a step portion is provided on the inner peripheral surface of the inner ring, and the caulking portion by the caulking process of the hub wheel is engaged in the step portion. It is possible to prevent the inner ring from coming off from the hub ring due to external force. Since the stepped portion has a very limited range of the inner peripheral edge of the inner ring, the stepped portion can be made as small as possible while ensuring the slip-off resistance of the inner ring. For this reason, there is little decrease in the area of the end surface of the inner ring while providing the stepped portion, the increase in contact surface pressure with the step surface of the constant velocity universal joint is suppressed, and it is possible to prevent the occurrence of wear and noise due to the occurrence of inner ring creep, etc. Thus, it is possible to suppress a decrease in bearing life.
In addition, since the seal member is fitted to the inner ring after the diameter-enlarged caulking process of the caulking part, the core metal of the seal member is not distorted due to the enlarging caulking process, and the airtightness and mud water resistance are reduced. Can be prevented.

In the present invention, the seal member has a L-shaped cored bar having a cylindrical portion that fits into the inner ring and a standing plate portion that extends from the inboard side end of the cylindrical portion toward the outer diameter side. A second seal member facing the first seal member, which is a member, is press-fitted into the inner diameter surface of the outer member, and a seal lip is provided on the second seal member for sliding contact with the core metal of the first seal member. It is good to be
With this configuration, the airtightness and mud water resistance of the bearing space between the inner ring and the outer member can be improved.

The method for manufacturing a wheel bearing device according to the present invention is applied to the wheel bearing device, wherein the seal member is fitted into the inner ring after the diameter-enlarged caulking process of the caulking portion. It is characterized by that.
According to this manufacturing method, since the seal member is fitted to the inner ring after the diameter-enlarged caulking process of the caulking portion, the core metal of the seal member does not generate distortion due to the enlarging caulking process, and is airtight. The wheel bearing device can be manufactured without deteriorating the property and the resistance to muddy water.

  The wheel bearing device according to the present invention includes an outer member having a double-row raceway surface on an inner periphery, an inner member having an outer periphery raceway surface facing each of the raceway surfaces, and the facing raceway surface. The inner member is provided on the outer periphery of an inboard side portion of the hub wheel and a hub wheel having a flange for mounting the axle on the outer periphery and a through hole in the center. It is an inner ring fitted to a stepped inner ring fitting part, has the raceway surface in each row on the hub ring and the inner ring, and has a stepped part on the inner peripheral edge of the end face on the inboard side of the inner ring, A bearing between the inner ring and the outer member is provided on the outer periphery of the end of the inboard side of the hub ring by expanding and crimping to engage a step surface facing the axial direction of the step portion of the inner ring. The space is sealed by a seal member press-fitted into the outer periphery of the inner ring side end of the inner ring, and the seal Since the material is fitted to the inner ring after the diameter-enlarged caulking process of the caulking portion, the inner ring is removed in the assembly process to the vehicle without adversely affecting the bearing function. In addition, the hub ring diameter-enlarging process for preventing the inner ring from slipping out can prevent the seal of the bearing space without causing distortion in the seal member that seals the bearing space between the inner ring and the outer member. Airtightness and muddy water resistance can be improved.

  The method for manufacturing a wheel bearing device according to the present invention also includes an outer member having a double-row raceway surface on the inner periphery, and an inner member having a raceway surface on the outer periphery that faces each of the raceway surfaces. A double-row rolling element interposed between the raceway surfaces, the inner member having a flange for mounting an axle on the outer periphery and a through hole in the center, and an inboard side portion of the hub wheel. An inner ring fitted to a step-shaped inner ring fitting portion provided on the outer periphery, the hub ring and the inner ring having the raceway surface in each row, and on the inner peripheral edge of the end surface on the inboard side of the inner ring A stepped portion is provided, and a caulking portion that engages with a stepped surface of the inner ring facing the axial direction of the stepped portion of the inner ring is provided on the outer periphery of the inboard side end of the hub ring by expanding the diameter, and the inner ring and the outer member The wheel shaft is sealed with a seal member press-fitted into the outer periphery of the inner ring side end of the inner ring. A method of manufacturing an apparatus, wherein the seal member is fitted into the inner ring after the diameter-enlarged caulking process of the caulking portion, so that the vehicle does not adversely affect the bearing function. The inner ring can be prevented from slipping out during the assembly process, and the hub ring is subjected to diameter-enlarged caulking to prevent the inner ring from slipping, and the seal member that seals the bearing space between the inner ring and the outer member is distorted. Therefore, it is possible to manufacture a wheel bearing device having good airtightness and muddy water resistance of the bearing space.

An embodiment of the present invention will be described with reference to FIGS. This embodiment is a third generation type inner ring rotation type and is applied to a wheel bearing device for driving wheel support. In this specification, the side closer to the outer side in the vehicle width direction of the vehicle when attached to the vehicle is referred to as the outboard side, and the side closer to the center of the vehicle is referred to as the inboard side.
The wheel bearing device includes an outer member 1 having a double-row raceway surface 3 formed on the inner periphery, an inner member 2 having a raceway surface 4 opposed to each raceway surface 3, and these outer members 1. And rolling elements 5 composed of double-row balls interposed between the raceway surfaces 3 and 4 of the inner member 2. This wheel bearing device is a double-row outward angular ball bearing type, and the rolling elements 5 are held by a cage 6 for each row. The raceway surfaces 3 and 4 have a circular arc shape in cross section, and the raceway surfaces 3 and 4 are formed such that the rolling element contact angle θ is back to back. Both ends of the bearing space between the outer member 1 and the inner member 2 are sealed by sealing means 7 and 8, respectively.

The outer member 1 is a member on the fixed side, and has a flange 1a attached to the knuckle in the suspension device (not shown) of the vehicle body on the outer periphery, and the whole is an integral part.
The inner member 2 is a rotating member, and is fitted to the outer periphery of the hub wheel 9 having a hub flange 9a for wheel mounting on the outer periphery and the inboard side end of the shaft portion 9b of the hub wheel 9. The inner ring 10 made. The hub ring 9 and the inner ring 10 are formed with the raceway surfaces 4 of the respective rows. The hub wheel 9 has a through hole 11 in the center. The raceway surface 4 of the hub wheel 9 is a surface hardened surface by quenching. The entire inner ring 10 is hardened by quenching from the surface to the core.

  As shown in the enlarged cross-sectional views of FIGS. 2 and 3, a stepped inner ring fitting portion having a smaller diameter than the outer periphery of the other part of the hub wheel 9 is provided on the outer periphery of the inboard side end of the hub wheel 9. 15 is formed, and the inner ring 10 is fitted to the inner ring fitting portion 15. A step portion 16 is provided on the inner peripheral edge of the end face of the inner ring 10 on the inboard side. That is, a stepped portion 16 having a depth corresponding to the inner peripheral edge of the end surface 10a is provided at the inboard side end of the inner ring 10 up to the end surface 10a on the inboard side of the inner ring 10. The step portion 16 is located on the inboard side of the straight line L that forms the rolling element contact angle θ of the raceway surface 4 of the inner ring 10. The inner surface of the stepped portion 16 has a shape including a straight portion 16a formed of a cylindrical surface and a stepped surface 16b facing in the axial direction. The step surface 16b is an inclined surface whose cross section along the axial direction is a straight line or a curved line. The step surface 16b may be a surface perpendicular to the axial direction.

  At the inboard side end of the hub wheel 9, a caulking portion 9 c that engages with a step surface 16 b facing the axial direction of the step portion 16 of the inner ring 10 by caulking is provided. FIG. 2 shows a state before the caulking process of the caulking portion 9c, and FIG. 3 shows a state after the caulking process. The caulking portion 9c has an inner diameter surface that is larger in diameter than other portions before and after caulking and has a reduced thickness. The caulking portion 9c does not protrude from the end surface 10a of the inner ring 10, but may not contact the inner diameter surface of the step portion 16 of the inner ring 10 or may contact it. As shown in FIG. 2, the sealing means 8 on the inboard side is not attached before the crimping portion 9c is crimped. After the crimping process, the sealing means 8 is press-fitted between the outer ring 1 and the inner ring 10. It will be attached and will be in the state of the assembly completion product shown in FIG. The methods of crimping and sealing means press-fitting will be described later.

  The inner peripheral surface of the through hole 11 of the hub wheel 9 has a general-shaped portion 11a in which a spline groove 11aa is formed. The portion on the inboard side of the general diameter portion 11a includes a large-diameter step portion 11b at the end of the inboard side and a groove bottom of the spline groove 11aa of the general-diameter portion 11a having a smaller diameter than the large-diameter step portion 11b. A stepped shape having two steps is formed by the intermediate diameter step portion 11c having a diameter larger than the diameter. An outer peripheral wall portion of the large-diameter step portion 11b is a cylindrical portion where the caulking is performed. Further, the intermediate diameter step portion 11 c is set to a position B deeper in the axial direction than the axial position A of the step portion 16 of the inner ring 10.

  As shown in FIG. 4, the sealing means 8 on the inboard side includes a first seal member 21 fitted to the outer periphery of the inner ring 10, and the inner periphery of the outer member 1 facing the first seal member 21. It is comprised with the 2nd sealing member 24 to fit. The first seal member 21 or its core 22 is a slinger.

  The first seal member 21 that also serves as a magnetic encoder includes a cored bar 22 and an encoder rubber 23 fixed to the cored bar 22. The cored bar 22 is a metal ring having an L-shaped cross section having a cylindrical part 22a for press-fitting and a standing plate part 22b extending from one end of the cylindrical part 22a to the outer diameter side. The first seal member 21 is attached to the inner member 2 by press-fitting the shaped portion 22 a to the outer diameter surface of the inner ring 10 of the inner member 2. The encoder rubber 23 is a ring-shaped member obtained by kneading magnetic powder and a rubber material, and the side surface opposite to the protruding side of the cylindrical portion 22a of the upright plate portion 22b of the cored bar 22 (facing the outside of the bearing). The magnetic poles aligned in the circumferential direction are magnetized. A rotation detection device for detecting the wheel rotation speed is configured by arranging the magnetic sensor 27 as shown in FIG. 4 so as to face the encoder rubber 23 in the first seal member 21.

  The second seal member 24 includes a metal core 25 and an elastic body 26 that is vulcanized and bonded to the metal core 25. The metal core 25 is a metal ring having an inverted L-shaped cross section having a cylindrical portion 25a for press-fitting and a standing plate portion 25b extending from one end of the cylindrical portion 25a to the inner diameter side. The shape portion 25 a is attached to the outer member 1 by press-fitting to the inner diameter surface of the outer member 1. The second seal member 24 integrally includes a side lip 26a slidably in contact with the core metal upright plate portion 22b of the first seal member 21 and radial lips 26b and 26c slidably in contact with the core metal cylindrical portion 22a. These seal lips 26 a to 26 c are provided as a part of the elastic body 26 vulcanized and bonded to the core metal 25. The second seal member 24 is configured such that an elastic body 26 is held in a fitting portion of the core metal 25 with the outer member 1. That is, the elastic body 26 has a tip cover portion 26d that covers from the inner diameter surface of the cylindrical portion 25a of the core metal 25 to the outer diameter of the tip portion, and the tip cover portion 26d serves as the core metal 25 and the outer member 1. It intervenes in the fitting part. The cylindrical portion 25a of the core metal 25 and the core metal upright plate portion 22b of the first seal member 21 are opposed to each other with a slight radial gap, and the labyrinth seal 28 is configured by the gap.

In assembling the wheel bearing device to the vehicle, the stem portion 13a of the outer ring 13 serving as one joint member of the constant velocity joint 12 is inserted into the through hole 11 of the hub wheel 9, and the spline on the outer periphery of the stem portion 13a. 13 aa and the spline groove 11 aa on the inner peripheral surface of the through hole 11 are spline-fitted, and the constant velocity joint outer ring 13 is coupled to the inner member 2 by tightening a nut 14 that is screwed to the tip of the stem portion 13 a. At this time, the step surface 13 b facing the outboard side provided in the constant velocity joint outer ring 13 is pressed against the end surface 10 a facing the inboard side of the inner ring 10, and the inner member 2 is formed by the constant velocity joint outer ring 13 and the nut 14. Is tightened.
The hub flange 9a for wheel attachment is located at the end of the hub wheel 9 on the outboard side, and a wheel (not shown) is attached to the hub flange 9a with a hub bolt 17 via a brake rotor.

  According to the wheel bearing device having this configuration, the step portion 16 is provided on the inner peripheral surface of the inner ring 10, and the caulking portion 9 c is engaged with the step surface 16 b facing the axial direction of the step portion 16 by the caulking process of the hub wheel 9. Therefore, it is possible to prevent the inner ring 10 from coming off from the hub wheel 9 due to an external force generated in the assembly process to the vehicle. Since the stepped portion 16 has a very limited range of the inner periphery of the inner ring 10, the stepped portion 16 can be made as small as possible while ensuring the slip-off resistance of the inner ring 10. For this reason, there is little decrease in the area of the end surface 10a of the inner ring 10 while the stepped portion 16 is provided, and an increase in the contact surface pressure with the step surface 13b of the constant velocity joint outer ring 13 is suppressed, thereby preventing the occurrence of wear and noise. Thus, a decrease in bearing life can be suppressed.

  In addition, since the axial range of the step portion 16 is limited to the position on the inboard side that does not extend to the straight line L that forms the rolling element contact angle θ of the raceway surface 4 of the inner ring 10, the inner ring 10 of the inner ring 10 due to a load load during operation is limited. The deformation can be reduced and the life can be extended accordingly. Further, the axial position A of the end portion on the outboard side of the step portion 16 of the inner ring 10 is made shallower than the axial position B of the end portion on the inboard side of the intermediate diameter step portion 11c of the through hole 11 to thereby form the inner ring step portion. Since the axial length of 16 is shortened, the fitting length (area) of the inner ring 10 to the hub ring 9 can be sufficiently secured, the occurrence of inner ring creep can be suppressed, and the bearing life can be extended. it can.

  The through hole 11 of the hub wheel 9 has a portion on the inboard side with respect to the general diameter portion 11a in which the spline groove 11aa is formed, a large diameter step portion 11b on the inboard side end, and a smaller diameter than the large diameter step portion 11b. Therefore, when the intermediate diameter step portion 11c is inserted into the stem portion 13a of the constant velocity joint outer ring 13, the intermediate diameter step portion 11c has a two-step stepped shape. As a result, the assemblability is further improved.

  In this wheel bearing device, since the raceway surface 4 of the hub wheel 9 is a hardened surface, the rolling life can be ensured. Since the caulking portion 9c is a non-heat treatment portion, the caulking process can be easily performed. The inner ring 10 is a small part having a raceway surface 4 and the inner diameter surface of the inner ring 10 being fitted to the hub ring 9, so that the entire surface from the surface to the core is hardened by quenching as described above. Thus, the rolling life is excellent and the wear resistance of the fitting surface is excellent.

  5 to 8 show a caulking process of the caulking portion 9 c of the hub wheel 9 and a press-fitting process of the inboard side sealing means 8. First, as shown in FIG. 5, the hub flange 9a of the hub wheel 9 is attached to the cradle 18 with the hub bolts 17, and the bearing device is fixed on the cradle 18 with the inboard side facing upward. At this time, the sealing means 8 on the inboard side is not attached between the outer ring 1 and the inner ring 10.

  In this fixed state, as shown in FIG. 6, the caulking punch 19 having the tapered outer peripheral surface 19 a is lowered onto the inboard side end of the hub wheel 9, and the distal end portion having the tapered outer peripheral surface is formed. By pressing into the inner periphery of the hub wheel 9, the crimped portion 9c of the hub wheel 9 is pressed over the entire periphery. As a result, as shown in FIG. 6B, which is an enlarged view of a part of FIG. 6A, the caulking portion 9c of the hub wheel 9 is caulked by the inner ring step portion 16, and the step surface 16b facing in the axial direction. Engage with. Since the tip outer peripheral surface 19a of the caulking punch 19 is a tapered surface, the caulking process is performed smoothly.

  Thereafter, the caulking punch 19 is retracted from the inboard side end of the hub wheel 9, and the sealing means 8 including the first sealing member 21 and the second sealing member 24 is sealed by the seal press-fitting jig 29 as shown in FIG. (See FIG. 4) is press-fitted into the end portion on the inboard side between the outer ring 1 and the inner ring 10. FIG. 8 shows a state where the press-fitting of the sealing means 8 is completed.

  In this way, since the inboard side sealing means 8 is attached after the caulking process of the caulking portion 9c of the hub wheel 9, the problem of caulking when the sealing means 8 is attached is avoided. can do. That is, when caulking is performed with the sealing means 8 attached, while the caulking punch 19 is in contact with the inboard side end of the hub wheel 9, the diameter of the seal press-fitting portion of the inner ring 10 is increased, and the caulking punch 19 is Since the seal press-fitting portion contracts at the moment of separation from the hub wheel 9, distortion remains in the metal core 22 of the first seal member 21 fitted to the inner ring 10, and the interference with the inner ring 10 is reduced. Airtightness and muddy water resistance are reduced. However, according to this manufacturing method, the first sealing member 21 is not affected by the caulking process, so that the airtightness and the muddy water resistance of the sealing means 8 are not reduced. For this reason, it is not necessary to increase the initial fastening allowance of the first seal member 21, and it is also possible to avoid the occurrence of problems such as kinking during press fitting due to the increased initial fastening allowance.

  The inboard-side seal means 8 includes a first seal member 21 that fits to the outer periphery of the inner ring 10 and a second seal member 24 that fits to the inner periphery of the outer member 1. Since the member 24 is provided with the seal lips 26a to 26c that are in sliding contact with the core metal 22 having the L-shaped cross section of the first seal member 21, the airtightness of the bearing space between the inner ring 10 and the outer member 1 is improved. Property and muddy water resistance are good.

It is sectional drawing of the wheel bearing apparatus concerning embodiment of this invention. It is a partial expanded sectional view before hub wheel caulking processing of the bearing device for the wheels. It is a partial expanded sectional view after hub ring caulking processing of the bearing device for the wheels. It is an expanded sectional view of the inboard side sealing means of the bearing device for the wheels. It is process drawing No. 1 of the caulking process and sealing means press-fitting of the bearing device for the wheels. (A) is the process drawing 2 of the caulking process and sealing means press-fitting of the bearing device for the wheel, and (B) is an enlarged view of the VIB portion. It is process drawing No. 3 of the caulking process of the wheel bearing device and the sealing means press-fitting. It is process drawing No. 4 of the caulking process of the wheel bearing device and the sealing means press-fitting. It is sectional drawing of the prior art example of the bearing apparatus for wheels. It is a partial expanded sectional view of the conventional example. (A) is explanatory drawing which shows the conventional crimping process, (B) is the XIB part enlarged view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Outer member 2 ... Inner member 3 ... Outer member raceway surface 4 ... Inner member raceway surface 5 ... Rolling elements 7, 8 ... Sealing means 9 ... Hub wheel 9a ... Hub flange 9c ... Clamping part 10 ... Inner ring 11 ... Through hole 15 ... Inner ring fitting part 16 ... Inner ring step part 16a ... Straight part 16b of inner ring step part ... Step surface 19 facing the axial direction of the inner ring step part ... Clamping punch 21 ... First seal member 22, 25 ... Core bars 22a, 25a ... Cylindrical portions 22b, 25b ... Standing plate portion 23 ... Encoder rubber 24 ... Second seal member 26 ... Elastic body 26a ... Side lip (seal lip)
26b, 26c ... Radial lip (seal lip)
29 ... Seal press-fit jig θ ... Rolling element contact angle L ... Straight line forming the rolling element contact angle

Claims (3)

An outer member having a double-row raceway surface on the inner periphery, an inner member having a raceway surface facing each of the raceway surfaces on the outer periphery, and a double-row rolling element interposed between the opposing raceway surfaces A hub wheel having a flange for mounting an axle on the outer periphery and a through hole in the center, and a stepped inner ring fitting portion provided on the outer periphery of the inboard side portion of the hub wheel. The inner ring is a fitted inner ring, the hub ring and the inner ring have the raceway surface in each row, a step portion is provided on the inner peripheral edge of the end surface on the inboard side of the inner ring, and the outer periphery of the inboard side end of the hub ring The inner ring is provided with a caulking portion that engages with a step surface facing the axial direction of the step portion of the inner ring by expanding and caulking, and a bearing space between the inner ring and the outer member is provided at an inboard side end of the inner ring. A wheel bearing device sealed with a seal member press-fitted into the outer periphery of
The wheel bearing device according to claim 1, wherein the seal member is fitted to the inner ring after the diameter-enlarged caulking process of the caulking portion.   In Claim 1, the said sealing member has a cross-section L-shaped cored bar which has a cylindrical part fitted to the above-mentioned inner ring, and a standing board part extended from the inboard side end of this cylindrical part to the outer diameter side, A second seal member facing the first seal member, which is a seal member, is press-fitted into the inner surface of the outer member, and a seal lip that is slidably contacted with the core metal of the first seal member is formed on the second seal member. Wheel bearing device provided. An outer member having a double-row raceway surface on the inner periphery, an inner member having a raceway surface facing each of the raceway surfaces on the outer periphery, and a double-row rolling element interposed between the opposing raceway surfaces A hub wheel having a flange for mounting an axle on the outer periphery and a through hole in the center, and a stepped inner ring fitting portion provided on the outer periphery of the inboard side portion of the hub wheel. The inner ring is a fitted inner ring, the hub ring and the inner ring have the raceway surface in each row, a step portion is provided on the inner peripheral edge of the end surface on the inboard side of the inner ring, and the outer periphery of the inboard side end of the hub ring The inner ring is provided with a caulking portion that engages with a step surface facing the axial direction of the step portion of the inner ring by expanding and caulking, and a bearing space between the inner ring and the outer member is provided at an inboard side end of the inner ring. A wheel bearing device sealed with a sealing member press-fitted into the outer periphery of the wheel,
The method for manufacturing a wheel bearing device according to claim 1, wherein the seal member is fitted into the inner ring after the diameter-enlarged caulking process of the caulking portion.

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