JP2015055306A - Wheel bearing device and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a wheel bearing device in which a bearing clearance adjustment is facilitated and at the same time an amount of use of expensive material having a high cleanliness factor used as a raceway surface is reduced to attain a low cost.SOLUTION: A wheel bearing 2 comprises an outer member 5 having a vehicle body fixing flange 3 integrally arranged at its outer circumference and formed with a fitting surface 10 at its inner circumference; an outer ring 6 press fitted to and fixed to the fitting surface 10 of the outer member 5 and formed with plural rows of outer raceway surfaces 6a at its inner circumference; a pair of inner rings 7, 8 internally inserted into the outer ring 6 and formed, at outer circumferences, with an inner raceway surfaces 7a oppositely facing against plural rows of outer raceway surfaces 6a; and plural rows of rolling motion members 9 rotatably stored between both raceway surfaces of these inner and outer rings. The fitting surface 10 of the outer member 5 is kept as its cutting work, after the outer ring 6 is press fitted and fixed to the outer member 5, the plural rows of outer raceway surfaces 6a are lathe turned, and the inner raceway surfaces 7a are lathe turned after the outer side inner ring 7 of the pair of inner rings 7, 8 is press fitted into a hub ring 1.

Description

  The present invention relates to a method of manufacturing a bearing device for a wheel that rotatably supports a wheel of an automobile or the like, and in particular, it is easy to adjust the clearance of the bearing and uses a high-purity and expensive material used as a race. The present invention relates to a wheel bearing device and a method for manufacturing the same that reduce costs and reduce costs.

  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. It is roughly divided into the second generation structure in which the body mounting flange or wheel mounting flange is directly formed on the outer periphery of the member (outer ring), or the third generation structure in which one inner rolling surface is directly formed on the outer periphery of the hub wheel. Has been.

  In recent years, in such a wheel bearing device, there is a strong demand for improvement in so-called NVH, not to mention improvement in durability and cost reduction, but noise (NOISE), vibration (VIBRATION), unpleasant sound (HARSHNESS). For example, the wheel bearing device shown in FIG. 20 is called the first generation for driving wheels, and is press-fitted into the hub wheel 51 and the hub wheel 51 to rotatably support the hub wheel 51 with respect to the knuckle 52. The wheel bearing 53 is mainly configured. The hub wheel 51 has a wheel mounting flange 54 at one end, a cylindrical small-diameter step portion 55 extending in the axial direction from the wheel mounting flange 54 on the outer periphery, and a serration 56 for torque transmission formed on the inner periphery. ing. A wheel bearing 53 is press-fitted into the small diameter step portion 55.

  The wheel bearing 53 is fixed in a state of being sandwiched between the shoulder 59 of the outer joint member 58 constituting the constant velocity universal joint 57 and the hub wheel 51. The outer joint member 58 is integrally formed with a stem portion 60 extending in the axial direction from the shoulder portion 59, and a serration 60 a and a screw portion 60 b that engage with the serration 56 of the hub wheel 51 are formed on the outer periphery of the stem portion 60. Has been. Torque from the engine is transmitted to the hub wheel 51 via a drive shaft and a constant velocity universal joint 57 (not shown) and a serration 60 a of the stem portion 60. Further, a desired bearing preload is applied to the wheel bearing 53 by fastening the fixing nut 61 to the threaded portion 60b of the stem portion 60 with a predetermined tightening torque.

  As shown in an enlarged view in FIG. 21, the wheel bearing 53 includes an outer ring 62, a pair of inner rings 63 and 63 inserted into the outer ring 62, and a double row of balls accommodated between the inner and outer rings 63 and 62. 64, 64, and a back-to-back type double row angular contact ball bearing set in a state where the front side end faces (small end faces) 63b of the pair of inner rings 63, 63 are butted.

  The outer ring 62 is integrally formed with double rows of outer rolling surfaces 62a and 62a on the inner periphery. The inner ring 63 is formed with an inner rolling surface 63a facing the double row outer rolling surfaces 62a, 62a on the outer periphery thereof. The double-row balls 64 and 64 are accommodated between the rolling surfaces 62a and 63a, respectively, and are held by the cages 65 and 65 so as to be able to roll. Further, seals 66 and 67 are attached to the end portion of the wheel bearing 53 to prevent leakage of the lubricating grease sealed inside the bearing and intrusion of rainwater, dust and the like from the outside into the bearing.

  As shown in FIG. 22A, the inner ring 63 is formed with a counter portion 68 having a diameter larger than the groove bottom diameter d1 and having a predetermined width in the vicinity of the groove bottom portion of the inner rolling surface 63a. As shown in an enlarged view of FIG. 22B, the counter portion 68 includes a cylindrical portion 68a extending in the axial direction from the inner rolling surface 63a, and a tapered surface that decreases in diameter from the cylindrical portion 68a toward the small end surface 63b. 68b, and a small outer diameter 69 is formed by reducing the diameter of the taper surface 68b by one step. The outer diameter d2 of the counter portion 68 is larger than the inscribed circle diameter d0 of the ball 64 by a predetermined scratch margin δ (one side) in a state where the ball 64 is stored in the groove bottom of the outer rolling surface 62a of the outer ring 62. The diameter is set (d2 = d0 + 2δ). The inclination angle θ of the tapered surface 68b is set to 5 ° or less. With this inclination angle θ, the ball 64 can be smoothly guided from the tapered surface 68b to the cylindrical portion 68a, and it is possible to suppress as much as possible the occurrence of scratches on the ball 64 during assembly.

  As shown in FIG. 23, the counter unit 68 is formed of a grinding wheel of a total type that has been formed into a predetermined shape and size. That is, at the same time as the inner rolling surface 63a, the large outer diameter 70, the counter portion 68, and the small end surface 63b are formed by the overall grinding wheel 71, and the counter portion 68 has a clicking margin δ within a predetermined tolerance range. The outer diameter d2 of the portion 68 is regulated within a predetermined standard value. Further, the connecting portion A between the inner rolling surface 63a and the counter portion 68 is formed in an arc surface having a predetermined radius of curvature R, and the corner portions of the cylindrical portion 68a and the tapered portion 68b in the counter portion 68 are arc-shaped. And is smoothly and continuously formed. As a result, the occurrence of burrs and the like can be prevented, and the outer diameter d2 of the counter portion 68 can be processed with high accuracy without variation. Accordingly, it is possible to prevent the occurrence of a scratch on the inner ring 63 during assembly, and the counter unit 68 does not come into contact with the ball 64 at the edge after the assembly, in the middle of conveyance or in the assembly process at the automobile manufacturer, and the acoustic The characteristics and life can be improved (for example, see Patent Document 1).

JP 2007-85371 A

  In this conventional wheel bearing 53, the connecting portion A between the inner rolling surface 63 a and the counter portion 68 is simultaneously ground by a general grindstone to be formed into an arc surface having a predetermined curvature radius R, and the counter portion 68. Since the corner portions of the cylindrical portion 68a and the tapered portion 68b are rounded into a circular arc shape and are formed smoothly and continuously, the occurrence of nicks and scratches during the assembly of the inner ring 63 and the falling off of the inner ring 63 after assembly are prevented. In addition, the initial clearance setting can be minimized and the preload variation can be reduced.

  In such a conventional wheel bearing 53, the bearing clearance is adjusted in advance by a selected combination of the outer ring 62, the inner ring 63 and the ball 64. However, since it is press-fitted and fixed to the hub wheel 51 and the knuckle 52, there is a problem that the range of the bearing clearance is expanded by this press-fitting. In order to regulate the range of this bearing clearance, it is necessary to adjust the initial bearing clearance in the wheel bearing 53 to a considerably narrow range. This not only complicates the assembly work and reduces the number of assembly steps, but also increases the management cost and causes a cost increase.

  The present invention has been made in view of such circumstances, and makes it easy to adjust the clearance of the bearing, while reducing the amount of expensive and highly expensive material used as a bearing ring, thereby reducing the cost. An object of the present invention is to provide a wheel bearing device and a manufacturing method thereof.

  In order to achieve such an object, the method invention according to claim 1 of the present invention has a wheel mounting flange for attaching a wheel to one end portion, and an outer periphery of the wheel mounting flange from the wheel mounting flange via a shoulder portion. In a manufacturing method of a wheel bearing device including a hub wheel formed with a small diameter step portion extending in the axial direction and a wheel bearing press-fitted into the hub wheel and rotatably supporting the hub wheel with respect to a knuckle, The wheel bearing integrally has a vehicle body mounting flange for mounting to the knuckle on the outer periphery, and an outer member having a cylindrical fitting surface formed on the inner periphery, and a fitting surface of the outer member The outer ring was press-fitted into the inner ring and formed with a double row outer raceway on the inner circumference, and the inner raceway was formed on the outer circumference and opposed to the outer raceway of the double row on the outer circumference. A cage is interposed between the pair of inner rings and the rolling surfaces of these inner and outer rings. And a rolling elements rollably accommodated in double row Te, outer raceway run surfaces of the double row after the outer ring is press-fitted into the outer member is grinding.

  As described above, the wheel bearing integrally has a vehicle body mounting flange to be attached to the knuckle on the outer periphery, the outer member having the cylindrical fitting surface formed on the inner periphery, and the fitting of the outer member. An outer ring that is press-fitted and fixed to the mating surface and has a double row outer rolling surface formed on the inner periphery, and an inner rolling surface that is inserted into the outer ring and that faces the double row outer rolling surface is formed on the outer periphery. A pair of inner rings, and a double row of rolling elements accommodated between the rolling surfaces of the inner and outer rings via a cage so that the outer ring is press-fitted and fixed to the outer member. Since the outer rolling surface of the outer ring is ground, it is possible to reduce the cost by using an inexpensive material with low cleanliness for the outer member, and the dimensions of the double row outer rolling surface by press-fitting the outer ring The change can be prevented and the clearance of the bearing can be easily adjusted.

  Preferably, as in the invention described in claim 2, if the fitting surface of the outer member is left turned, the cost can be reduced by eliminating grinding.

  Further, as in the invention described in claim 3, if the outer member is formed from a plate material by plastic working, the cost can be further reduced.

  Further, as in the invention according to claim 4, if the inner raceway is ground after the inner ring on the outer side of the pair of inner rings is press-fitted into the hub ring, the inner rolling by the inner ring press-fitting is performed. It is possible to prevent the dimensional change of the running surface and to easily adjust the bearing clearance.

  Moreover, if the width dimension of the outer ring is set to be smaller than the set width of the pair of inner rings as in the invention described in claim 5, the amount of material used for the outer ring that requires a highly clean material can be reduced. The cost can be reduced by reducing as much as possible.

  Further, as in the invention described in claim 6, if the end surface of the outer ring is set so as not to be hung on the outer diameter surface of the inner ring, a sufficient sectional height of the seal can be secured, and the inner ring It is possible to increase the groove depth of the inner rolling surface of the roller, and to prevent the contact ellipse of the rolling element from riding on the inner rolling surface when a turning moment is applied, and to prevent edge load from occurring. Can be improved.

  Further, as in the invention described in claim 7, a hardened layer is formed on the outer periphery of the hub wheel by induction hardening in a range of surface hardness of 50 to 64 HRC, and the hardened layer is formed between the shoulder and the shoulder. If it is set only at the corner of the small diameter step, the cost can be reduced by simplifying induction hardening, and at least the fretting of the shoulder due to contact with the inner ring can be prevented, and the moment load is applied to the wheel mounting flange. The desired strength and durability can be ensured even when repeatedly loaded.

  Further, as in the eighth aspect of the invention, a seal is attached to the outer end of the outer member, and the opening of the annular space formed between the outer member and the inner ring is sealed. If so, it is possible to reduce the amount of material used for the outer ring that requires a material with a high cleanliness as much as possible, thereby reducing the cost.

  Further, as in the invention according to claim 9, if the outer side end face of the outer member is opposed to the inner side face of the wheel mounting flange via an axial clearance, a labyrinth seal is formed. Further, it is possible to prevent muddy water or the like from directly entering the seal, and to improve the durability of the seal.

  Further, as in the invention described in claim 10, a cap is attached to the inner side end portion of the outer member, and the cap is made of a nonmagnetic austenitic stainless steel plate having corrosion resistance by press working. If it is formed in a letter shape, it will not adversely affect the sensing performance of the rotational speed sensor, and it can be a separate pilot part that becomes the fitting part of the knuckle, and the shape of the outer member can be simplified. Cost reduction.

  Further, the invention according to claim 11 of the present invention has a wheel mounting flange for attaching a wheel to one end portion, and a small diameter step extending in the axial direction from the wheel mounting flange to the outer periphery via a shoulder portion. A wheel bearing device comprising a hub wheel formed with a portion and a wheel bearing that is press-fitted into the hub wheel and rotatably supports the hub wheel with respect to a knuckle. A body mounting flange to be attached to the knuckle is integrated, an outer member having a cylindrical fitting surface formed on the inner periphery, and press-fitted and fixed to the fitting surface of the outer member. An outer ring formed with an outer rolling surface of the row, a pair of inner rings interpolated in the outer ring and formed with an inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and the inner and outer rings Double row accommodated between both rolling surfaces via a cage. Rolling a body, an outer rolling run surfaces of the double row after the outer ring is press-fitted into the outer member is grinding.

  In this way, a hub wheel having a wheel mounting flange for mounting a wheel at one end integrally, and a small-diameter step portion extending in the axial direction from the wheel mounting flange via a shoulder portion on the outer periphery, and the hub In a wheel bearing device having a wheel bearing that is press-fitted into a wheel and rotatably supports a hub wheel with respect to a knuckle, the wheel bearing integrally has a vehicle body mounting flange for being attached to the knuckle on the outer periphery. An outer member having a cylindrical fitting surface formed on the inner periphery, an outer ring press-fitted and fixed to the fitting surface of the outer member, and a double-row outer rolling surface formed on the inner periphery; and A pair of inner rings that are inserted into the outer ring and formed with inner rolling surfaces facing the outer rolling surfaces of the double row on the outer periphery, and can be freely rolled via a cage between both rolling surfaces of these inner and outer rings. And the outer ring is press-fitted and fixed to the outer member. Since the outer raceway surface of the double row is ground, the cost can be reduced by using an inexpensive material with low cleanliness for the outer member, and the outer row of the double row by the outer ring is press-fitted. It is possible to prevent the dimensional change of the running surface and to easily adjust the bearing clearance.

  Further, as in the invention described in claim 12, a wheel mounting flange for mounting a wheel on one end portion is integrally provided, and a small-diameter step portion extending in the axial direction from the wheel mounting flange via a shoulder portion is provided on the outer periphery. A vehicle body mounting for including a formed hub wheel and a wheel bearing that is press-fitted into the hub wheel and rotatably supports the hub wheel with respect to a knuckle, and the wheel bearing is attached to the knuckle on an outer periphery. An outer member with an integral flange and a cylindrical mating surface formed on the inner circumference, and press-fitted and fixed to the mating surface of this outer member, forming a double row outer rolling surface on the inner circumference A pair of inner rings formed on the outer periphery and formed with an inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and a cage between both rolling surfaces of the inner and outer rings. Wheel bearing device comprising a double row rolling element housed in a freely rotatable manner via In this case, if the outer member is made of a material that is less clean than the outer ring, the amount of expensive and highly clean material used as a rolling surface is reduced as much as possible to further reduce costs. be able to.

  The method for manufacturing a wheel bearing device according to the present invention has a wheel mounting flange for mounting a wheel at one end, and a small-diameter step portion extending axially from the wheel mounting flange via a shoulder on the outer periphery. In a manufacturing method of a wheel bearing device comprising a formed hub wheel and a wheel bearing press-fitted into the hub wheel and rotatably supporting the hub wheel with respect to a knuckle, the wheel bearing is provided on an outer periphery. A body mounting flange for mounting to the knuckle is integrally formed, an outer member having a cylindrical fitting surface formed on the inner periphery, and press-fitted and fixed to the fitting surface of the outer member. An outer ring formed with a double row outer rolling surface, a pair of inner rings inserted into the outer ring and formed with an inner rolling surface facing the outer side rolling surface of the double row on the outer periphery, and these inner and outer rings It is accommodated between the rolling surfaces of the roller through a cage so that it can roll freely. A double row rolling element, and the outer ring is rolled and fixed to the outer member, and the outer rolling surface of the double row is ground, so an inexpensive material with low cleanliness is used for the outer member. Thus, the cost can be reduced and the dimensional change of the double row outer raceway due to the press-fitting of the outer ring can be prevented, and the adjustment of the clearance of the bearing can be facilitated.

  The wheel bearing device according to the present invention integrally has a wheel mounting flange for mounting a wheel at one end, and a small-diameter step portion extending in the axial direction from the wheel mounting flange via a shoulder is formed on the outer periphery. In a wheel bearing device comprising a hub wheel and a wheel bearing that is press-fitted into the hub wheel and rotatably supports the hub wheel with respect to a knuckle, the wheel bearing is attached to the knuckle on the outer periphery. An outer member having a cylindrical mounting surface on the inner periphery, and press-fitted and fixed to the engaging surface of the outer member, and double row outer rolling on the inner periphery An outer ring formed with a surface, a pair of inner rings inserted into the outer ring and formed with an inner rolling surface facing the outer rolling surface of the double row on the outer periphery, and between both rolling surfaces of the inner and outer rings With double-row rolling elements accommodated in a rotatable manner through a cage. Since the outer rolling surfaces of the double row are ground after the outer ring is press-fitted and fixed to the outer member, the outer member is made of an inexpensive material with a low cleanliness, thereby reducing the cost. In addition, it is possible to prevent the dimensional change of the double-row outer rolling surface due to the press-fitting of the outer ring, and it is possible to easily adjust the clearance of the bearing.

  In addition, the wheel bearing device according to the present invention has a wheel mounting flange for mounting the wheel at one end integrally, and a small-diameter step portion extending in the axial direction from the wheel mounting flange via the shoulder is formed on the outer periphery. And a wheel bearing that is press-fitted into the hub wheel and rotatably supports the hub wheel with respect to a knuckle, and the wheel bearing is attached to the knuckle on the outer periphery. And an outer member having a cylindrical fitting surface formed on the inner periphery, and press-fitted and fixed to the fitting surface of the outer member, and a double row outer rolling surface is formed on the inner periphery. An outer ring, a pair of inner rings that are inserted into the outer ring and formed on the outer periphery with an inner rolling surface facing the outer rolling surface of the double row, and a cage between both rolling surfaces of the inner and outer rings. Wheel bearing device comprising a double row rolling element accommodated in a freely rolling manner via In this case, the outer member is made of a material having a lower degree of cleanliness than the outer ring, so that the amount of expensive and high-purity material used as a rolling surface is reduced as much as possible to further reduce the cost. Can be planned.

It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. It is a principal part enlarged view which shows the wheel bearing of FIG. It is a principal part enlarged view which shows the seal part of FIG. It is a principal part enlarged view which shows the cap part of FIG. (A)-(c) is explanatory drawing which shows the manufacturing method of the outward member which concerns on this invention. (A)-(c) is explanatory drawing which shows the manufacturing method of the inward member which concerns on this invention. It is explanatory drawing which shows the manufacturing method of the wheel bearing apparatus of FIG. It is explanatory drawing which shows the hardened layer range of the hub ring of FIG. It is explanatory drawing which shows the modification of the hub ring of FIG. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view which shows the seal part of FIG. It is a longitudinal cross-sectional view which shows 3rd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view which shows the seal part of FIG. It is a longitudinal cross-sectional view which shows 4th Embodiment of the wheel bearing apparatus which concerns on this invention. It is a principal part enlarged view which shows the wheel bearing of FIG. (A)-(c) is explanatory drawing which shows the manufacturing method of the outward member which concerns on this invention. It is explanatory drawing which shows the manufacturing method of the wheel bearing apparatus of FIG. It is a longitudinal cross-sectional view which shows 5th Embodiment of the wheel bearing apparatus which concerns on this invention. It is a longitudinal cross-sectional view which shows 6th Embodiment of the wheel bearing apparatus which concerns on this invention. It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus. It is a longitudinal cross-sectional view which shows the wheel bearing of FIG. (A) is the principal part enlarged view of FIG. 21, (b) is the principal part enlarged view which expanded (a). It is explanatory drawing which shows the grinding process of the inner ring | wheel of FIG.

  A hub wheel integrally having a wheel mounting flange for mounting a wheel at one end and a small-diameter step portion extending in the axial direction from the wheel mounting flange via a shoulder portion on the outer periphery, and press-fitted into the hub wheel In the manufacturing method of the wheel bearing device including the wheel bearing for rotatably supporting the hub wheel with respect to the knuckle, the wheel bearing is integrally provided with a vehicle body mounting flange for being attached to the knuckle on the outer periphery. And an outer member having a cylindrical fitting surface formed on the inner periphery, and an outer ring press-fitted and fixed to the fitting surface of the outer member, and a double row outer rolling surface formed on the inner periphery. A pair of inner rings that are inserted into the outer ring and formed on the outer periphery with an inner rolling surface facing the outer rolling surface of the double row, and between the rolling surfaces of the inner and outer rings via a cage. A plurality of rolling elements accommodated in a freely movable manner, and fitting of the outer member After the outer ring is press-fitted and fixed to the outer member, the outer rolling surface of the double row is ground and the inner ring on the outer side of the pair of inner rings is the hub. After being press-fitted into the ring, the inner rolling surface is ground.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a longitudinal sectional view showing a first embodiment of a wheel bearing device according to the present invention, FIG. 2 is an enlarged view of a main part showing the wheel bearing of FIG. 1, and FIG. 3 is a seal portion of FIG. FIG. 4 is an enlarged view of the main part showing the cap part of FIG. 2, and FIGS. 5A to 5C are explanatory views showing the method for manufacturing the outer member according to the present invention. 6 (a) to (c) are explanatory views showing a method for manufacturing the inner member according to the present invention, FIG. 7 is an explanatory view showing a method for manufacturing the wheel bearing device of FIG. 1, and FIG. FIG. 9 is an explanatory view showing a modified example of the hub wheel of FIG. 8. In the following description, the side closer to the outer side of the vehicle when assembled to the vehicle is referred to as the outer side (left side in FIG. 1), and the side closer to the center is referred to as the inner side (right side in FIG. 1).

  FIG. 1 shows a wheel bearing device for a driven wheel referred to as a first generation. The wheel bearing device is press-fitted into a hub wheel 1 and the hub wheel 1, and the hub wheel 1 is inserted into a knuckle (not shown). The wheel bearing 2 that is rotatably supported is mainly configured. The hub wheel 1 is formed with a wheel mounting flange 3 at one end portion and a small-diameter step portion 4 extending in the axial direction from the wheel mounting flange 3 through a shoulder portion 1a on the outer periphery. Hub bolts 3a for fastening a wheel (not shown) and a brake rotor (not shown) are implanted in the wheel mounting flange 3 at equal intervals in the circumferential direction.

  The wheel bearing 2 includes an outer member 5, an outer ring 6 press-fitted and fixed to the outer member 5, a pair of inner rings 7 and 8 inserted in the outer ring 6, the inner rings 7 and 8, and the outer ring 6 And a pair of rolling elements (balls) 9 and 9 accommodated between them, and a pair of inner rings 7 and 8 which are set in a state where the front side end faces (small end faces) 7b and 7b are butted together It consists of a double-row angular contact ball bearing of the type.

  The outer member 5 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and integrally has a vehicle body mounting flange 5b to be attached to the knuckle on the outer periphery, and the outer ring 6 is fitted on the inner periphery. A cylindrical fitting surface 10 to be joined is formed. The outer ring 6 is made of high carbon chrome bearing steel such as SUJ2, and the outer circumferential surfaces 6a and 6a of the double row are integrally formed on the inner periphery, and the core is hardened in the range of 58 to 64 HRC by quenching. .

  The inner rings 7 and 8 are made of high carbon chrome bearing steel such as SUJ2 like the outer ring 6, and the inner race surface 7a facing the outer row race surfaces 6a and 6a in the double row is formed on the outer periphery. The core is hardened in the range of 58 to 64 HRC. And the double row rolling elements 9 and 9 are accommodated between these rolling surfaces 6a and 7a, respectively, and are hold | maintained by the holder | retainers 11 and 11 so that rolling is possible.

  A seal 12 is attached to the opening of the annular space formed between the outer member 5 and the inner ring 7 on the outer side, and a cap 13 is attached to the opening on the inner side of the outer member 5. This prevents leakage of lubricating grease sealed inside the bearing and prevents rainwater, dust, etc. from entering the bearing from the outside. In addition, although the wheel bearing comprised by the double row angular contact ball bearing which used the ball for the rolling element 9 was illustrated here, it is not restricted to this but is comprised by the double row tapered roller bearing which uses the tapered roller for the rolling element 9 It may be what was done.

  As shown in the enlarged view of FIG. 2, the outer member 5 has an annular groove 5 a formed on the outer peripheral surface on the outer side. By this annular groove 5a, muddy water or the like that has traveled on the outer peripheral surface of the outer member 5 flows and is discharged to the lower part (road surface side) along this bowl-shaped annular groove 5a. Infiltration can be suppressed.

  A flange portion 10 a is integrally formed on the inner side of the fitting surface 10 of the outer member 5, and an annular retaining ring groove 14 is formed on the outer side, and a retaining ring 15 attached to the retaining ring groove 14. The outer ring 6 is positioned and fixed in the axial direction by the flange portion 10a.

  On the other hand, a pair of inner rings 7 and 8 are press-fitted into the small-diameter step portion 4 of the hub wheel 1 via a predetermined squeezing until the large end surface 7c of the inner ring 7 on the outer side abuts with the shoulder 1a. The pair of inner rings 7 and 8 are fixed in the axial direction in a state where a predetermined bearing preload is applied by a caulking portion 4a formed by plastically deforming an end portion of the small diameter step portion 4 radially outward. Here, although the pair of inner rings 7 and 8 are configured with the same specifications, the chamfered portion at the end on the large diameter side of the inner ring 7 on the outer side of the pair of inner rings 7 and 8 is more than the inner ring 8 on the inner side. The only difference is that it is large. In addition, the same specification means that the dimensions of the inner rolling surface 7a and the like including the inner diameter, outer diameter, and width dimension of the bearing are the same.

  A pulsar ring 16 is press-fitted into the outer diameter surface 7d of the inner ring 8 on the inner side. The pulsar ring 16 includes a support ring 17 formed in an annular shape, and a magnetic encoder 18 that is integrally joined to a side surface of the support ring 17 by vulcanization adhesion or the like. This magnetic encoder 18 is a rotary encoder for detecting the rotational speed of a wheel by mixing magnetic powder such as ferrite in an elastomer such as rubber and magnetizing magnetic poles N and S alternately in the circumferential direction.

  The support ring 17 has a rust preventive ability such as a ferromagnetic steel plate, for example, a ferritic stainless steel plate (JIS standard SUS430 or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC or the like). It has a cylindrical portion 17a that is formed into a substantially L-shaped cross section by pressing from a steel plate, and is press-fitted into the inner ring 8, and a standing plate portion 17b that extends radially outward from the cylindrical portion 17a. A magnetic encoder 18 is joined to the inner side surface of the upright plate portion 17b.

  As shown in an enlarged view in FIG. 3, the outer seal 12 is composed of a so-called pack seal, which is a composite seal composed of an annular seal plate 19 and a slinger 20 that are arranged to face each other. The seal plate 19 includes a cored bar 21 attached to the outer member 5 and a seal member 22 integrally joined to the cored bar 21 by vulcanization adhesion.

  The core metal 21 is formed into a substantially L-shaped cross section by press working from an austenitic stainless steel sheet (JIS standard SUS304 system or the like) or a rust-proof cold rolled steel sheet. The seal member 22 is made of synthetic rubber such as NBR (acrylonitrile-butadiene rubber), and includes a base portion 22a that covers the inner peripheral surface of the core metal 21, and a side lip 22b that extends from the base portion 22a so as to incline radially outward. A dust lip 22d and a grease lip 22d are formed on the inner diameter side of the side lip 22b. Then, the base portion 22 a is fixed by going around from the outer surface of the end portion of the fitting portion of the metal core 21 to the inner edge of the inner diameter portion, thereby improving the airtightness of the fitting portion with the outer member 5. In addition to NBR, the material of the seal member 22 includes, for example, HNBR (hydrogenated acrylonitrile-butadiene rubber), EPM, EPDM (ethylene / propylene rubber), etc., which have excellent heat resistance, heat resistance and chemical resistance. Examples thereof include ACM (polyacrylic rubber), FKM (fluororubber), and silicon rubber, which are excellent in properties.

  On the other hand, the slinger 20 has a substantially L-shaped cross section, and includes a cylindrical portion 20a that is press-fitted into the outer diameter surface 7d of the inner ring 7, and a standing plate portion 20b that extends radially outward from the cylindrical portion 20a. . Then, the side lip 22b of the seal member 22 is slidably contacted with the upright plate portion 20b via a predetermined axial nip, and the dust lip 22c and the grease lip 22d are slid onto the cylindrical portion 20a via a predetermined radial nip. It is touched.

  A cap 13 is attached to the outer member 5 and closes the opening on the inner side of the outer member 5. The cap 13 has corrosion resistance and is formed into a cup shape by pressing from a non-magnetic austenitic stainless steel plate so as not to adversely affect the sensing performance of a rotational speed sensor (not shown), as shown in FIG. A cylindrical fitting portion 13a that is press-fitted into the inner periphery of the inner side end of the outer member 5, and a small axial clearance from the fitting portion 13a to the magnetic encoder 18 via the reduced diameter portion 13b. Oppositely, the bottom part 13c which covers the edge part of the inner side of the hub wheel 1 is provided.

  An elastic member 23 made of synthetic rubber such as NBR is integrally joined to the reduced diameter portion 13b by vulcanization adhesion. The elastic member 23 includes an annular protrusion 23a that protrudes radially outward from the outer diameter of the fitting portion 13a. And this annular protrusion 23a is elastically deformed and crimped | bonded to the outer member 5 at the time of the cap 13 fitting, and the airtightness of the fitting part 13a is improved.

  Here, in this embodiment, as shown in FIG. 2, the width dimension Wo of the outer ring 6 is set to a pair of inner rings 7 so that the axial position of the end face of the outer ring 6 does not hang on the outer diameter surface 7 d of the inner rings 7, 8. , 8 is set smaller than the set width Wi (= W1 + W2). As a result, a sufficient cross-sectional height of the seal 12 can be ensured, and the groove depth of the inner rolling surface 7a can be increased, so that the contact ellipse of the rolling element 9 is loaded on the inner rolling surface 7a when a turning moment is applied. It is possible to prevent the occurrence of an edge load by climbing the shaft and improve the durability of the bearing. In addition, the amount of material used for the outer ring 6 that requires a highly clean material can be reduced as much as possible to reduce the cost.

  As described above, the outer member 5 and the outer ring 6 are made of the same kind of steel material. For example, the outer member 5 is made of the same kind of steel material, but the outer member 5 is made of an inexpensive material with low cleanliness. On the other hand, cost can be reduced by using a material with a high cleanliness for the outer ring 6.

Next, the manufacturing method of the wheel bearing 2 is demonstrated using FIGS.
As shown in FIG. 5A, the outer peripheral surface of the outer member 5 including the vehicle body mounting flange 5b, the annular groove 5a and the like, and the inner peripheral surfaces of the fitting surface 10, the flange portion 10a, the retaining ring groove 14 and the like are provided. Each is formed by turning. Then, the outer ring 6 ′ is press-fitted into the fitting surface 10, and a retaining ring 15 is mounted in the retaining ring groove 14, and the outer ring 6 ′ is positioned and fixed by the retaining ring 15 and the flange portion 10 a.

  Here, the fitting surface 10 of the outer member 5 may be ground after turning, but in the present embodiment, the fitting surface 10 remains turned. In addition, the outer ring 6 ′ is turned in a state in which the outer surface 6b and the width surface 6c of the double row outer rolling surfaces 6a ′ and 6a ′ are left with a grinding allowance, and after being subjected to heat treatment (sublimation quenching). The outer peripheral surface 6b and the width surface 6c excluding the double row outer rolling surfaces 6a ′ and 6a ′ are ground.

  Next, as shown in FIG. 5 (b), the outer ring 6 ′ is press-fitted and fixed to the outer member 5, and then the outer ring 6 ′ is in sliding contact with the outer peripheral surface of the outer member 5. A grinding wheel 25 of the total type is inserted in The outer peripheral surface to which the shoe 24 is slidably contacted is previously finished to a predetermined shape and size by grinding. Then, as shown in FIG. 5C, the double-row outer rolling surfaces 6a ′ and 6a ′ are simultaneously ground by the grinding wheel 25 formed in a predetermined shape and size, and at the same time by a super grinding wheel (not shown). Finished to the shape and dimensions. Thus, after the outer ring 6 is press-fitted and fixed to the outer member 5, the outer rolling surfaces 6a, 6a of the double row are ground, so an inexpensive material with low cleanliness is used for the outer member 5, To reduce the cost by reducing the amount of high-purity and high-priced material used as the rolling surface as much as possible, and to reduce the cost by eliminating grinding of the fitting surface 10 of the outer member 5. Can do. Moreover, since the outer rolling surfaces 6a and 6a are formed in a state after the outer ring 6 has been press-fitted in advance, it is possible to prevent dimensional changes of the double row outer rolling surfaces 6a and 6a due to the press-fitting of the outer ring 6 ′. It is possible to easily adjust the clearance of the bearing. Here, “a material with low cleanliness” refers to a material having an oxygen content exceeding 20 ppm, for example.

  On the other hand, as shown in FIG. 6A, the hub wheel 1 is subjected to a heat treatment (induction hardening) to be described later after turning the outer peripheral surfaces of the wheel mounting flange 3, the shoulder portion 1a, the small diameter step portion 4 and the like. The small diameter step 4 is ground, and the outer side inner ring 7 ′ is press-fitted into the small diameter step 4. Here, after the inner ring 7 ′ is turned with the inner rolling surface 7a ′, the inner diameter surface 7e, the large end surface 7c, and the small end surface 7b ′ left with a grinding allowance, and is subjected to a heat treatment (submerged quenching). The inner diameter surface 7e and the large end surface 7c excluding the inner rolling surface 7a ′ and the small end surface 7b ′ are ground.

  Next, as shown in FIG. 6B, the inner ring 7 ′ is press-fitted and fixed to the small-diameter step portion 4 of the hub wheel 1, and then the total grinding wheel 26 is extrapolated to the inner ring 7 ′. Then, as shown in FIG. 6 (c), the inner rolling surface 7a, the small end surface 7b and the counter portion 27 are simultaneously ground by the grinding wheel 26 formed in a predetermined shape and size, and at the same time by a super grinding wheel (not shown). Finished to a predetermined shape and size. In this way, since the inner rolling surface 7a is ground after the outer side inner ring 7 is press-fitted and fixed to the small-diameter step portion 4 of the hub wheel 1, the dimensional change of the inner rolling surface 7a due to the inner ring 7 ′ is press-fitted. Can be prevented, and the adjustment of the clearance of the bearing can be facilitated.

  As shown in FIG. 7, the wheel bearing 2 is assembled by press-fitting and fixing a seal 12 to the outer end of the outer ring 6 and rolling elements 9 and cages 11 on the outer rolling surface 6a on the outer side. Assembly is installed. In this state, the outer member 5 is extrapolated to the hub wheel 1, and the outer rolling element 9 is accommodated between the outer rolling surface 6 a of the outer ring 6 and the inner rolling surface 7 a of the inner ring 7. Thereafter, the assembly of the rolling elements 9 and the retainer 11 is mounted on the inner-side outer raceway 6a, and the inner-side inner ring 8 is press-fitted into the small-diameter step portion 4. Finally, the end portion of the small-diameter step portion 4 is plastically deformed to form a crimped portion 4a, and the pair of inner rings 7 and 8 are applied to the hub wheel 1 with a predetermined bearing preload applied by the crimped portion 4a. Fixed.

  In this embodiment, as shown in FIG. 8, the surface hardness is set to a range of 50 to 64 HRC by induction quenching from the shoulder portion 1a of the hub wheel 1 to the small diameter step portion 4 (cross hatching in the figure). Are formed). The caulking portion 4a is a raw unquenched portion after forging.

  Here, the hardened layer 28 is formed by induction hardening over the entire region of the small diameter step portion 4 except for the caulking portion 4a of the hub wheel 1. However, the present invention is not limited to this, and as shown in FIG. The hardened layer 29 (with cross-hatching in the figure) has a surface hardness of 50 to 64 HRC by induction hardening only on the shoulder 1a with which the inner ring 7 is abutted and only the shoulder 1a and the corner 1b of the small-diameter step 4 May be formed. As a result, the cost can be reduced by simplifying induction hardening, fretting of the shoulder 1a due to contact with the inner ring 7 can be prevented, and the desired strength and durability can be obtained even when moment load is repeatedly applied to the wheel mounting flange 3. Sex can be secured.

  FIG. 10 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention, and FIG. 11 is an enlarged view of a main part showing the seal portion of FIG. The second embodiment is basically the same as the above-described embodiment (FIG. 1) except that the seal and the outer member are partially different in configuration, and other parts having the same parts or the same functions. The same reference numerals are given to the parts and the detailed description thereof is omitted.

  The wheel bearing device shown in FIG. 10 is for a driven wheel called the first generation, and is press-fitted into the hub wheel 1 and the hub wheel 1 to rotate the hub wheel 1 with respect to a knuckle (not shown). The wheel bearing 30 that is freely supported is mainly configured.

  The wheel bearing 30 includes an outer member 31, an outer ring 6 press-fitted and fixed to the outer member 31, a pair of inner rings 7 and 8 inserted in the outer ring 6, the inner rings 7 and 8, and the outer ring 6 Are provided with double-row rolling elements 9, 9 accommodated in between.

  The outer member 31 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, has a body mounting flange 5b integrally on the outer periphery, and a cylindrical shape in which the outer ring 6 is fitted on the inner periphery. A fitting surface 10 is formed.

  In addition, a seal 32 is attached to the opening of the annular space formed between the outer member 31 and the base 3 b of the wheel mounting flange 3 of the hub wheel 1 and the inner ring 7 on the outer side, and the outer member 31. A cap 13 is attached to the opening on the inner side to prevent leakage of the lubricating grease sealed inside the bearing and prevent rainwater, dust, etc. from entering the bearing from the outside.

  As shown in an enlarged view in FIG. 11, the outer-side seal 32 includes a core bar 33 press-fitted into the inner periphery of the outer-side end portion of the outer member 31 via a predetermined shimiro, and a pressure applied to the core bar 33. It is constituted by an integrated seal composed of a seal member 34 integrally joined by sulfur bonding. The core metal 33 is formed from an austenitic stainless steel plate or a cold rolled steel plate in a substantially L-shaped cross section by press working.

  On the other hand, the seal member 34 is made of synthetic rubber such as NBR, and is formed to be inclined outward in the radial direction. The side lip 34a and the dust lip are slidably contacted with a base portion 3b having a circular cross section in a predetermined axial direction. 34b, and a grease lip 34c formed so as to be inclined toward the inner side of the bearing and in sliding contact with the outer diameter surface 7d of the inner ring 7 via a predetermined radial shimiro.

  In addition to NBR, examples of the material of the seal member 34 include HNBR, EPDM, etc. excellent in heat resistance, ACM, FKM, silicon rubber, etc. excellent in heat resistance and chemical resistance. Can do.

  Here, in the present embodiment, the outer end surface 31a of the outer member 31 is formed to extend in the axial direction, and is opposed to the inner side surface 3c of the wheel mounting flange 3 via a slight axial clearance. A labyrinth seal 35 is formed. This prevents muddy water or the like from directly entering the seal 32 and improves the durability of the seal 32.

  Also in this embodiment, after the outer ring 6 is press-fitted and fixed to the outer member 31, the double row outer rolling surfaces 6 a and 6 a are ground and the outer side inner ring 7 is a hub as in the above-described embodiment. Since the inner rolling surface 7a is ground after being press-fitted and fixed to the small-diameter step portion 4 of the wheel 1, an inexpensive material with low cleanliness is used for the outer member 31, and the cleanliness used as the rolling surface is reduced. The amount of expensive and expensive material used can be reduced as much as possible to reduce the cost, and the dimensional change of the rolling surfaces 6a and 7a due to the press-fitting of the outer ring 6 and the inner ring 7 can be prevented, and the bearing clearance can be easily adjusted. can do.

  FIG. 12 is a longitudinal sectional view showing a third embodiment of the wheel bearing device according to the present invention, and FIG. 13 is an enlarged view of a main part showing the seal portion of FIG. The third embodiment is basically different from the above-described embodiment (FIG. 1) only in the seal configuration, and the same reference numerals are given to the same parts and parts having the same functions or the same functions. In addition, the detailed description is omitted.

  The wheel bearing device shown in FIG. 12 is for a driven wheel called the first generation, and is pressed into the hub wheel 1 and the hub wheel 1 to rotate the hub wheel 1 with respect to a knuckle (not shown). The wheel bearing 2 that is freely supported is mainly configured.

  The wheel bearing 2 includes an outer member 5, an outer ring 6 press-fitted and fixed to the outer member 5, a pair of inner rings 7 and 8 inserted in the outer ring 6, the inner rings 7 and 8, and the outer ring 6 Are provided with double-row rolling elements 9, 9 accommodated in between.

  A seal 36 is attached to the opening of the annular space formed between the outer member 5 and the base 3b of the wheel mounting flange 3 of the hub wheel 1 and the inner ring 7 on the outer side. A cap 13 is attached to the opening on the side to prevent leakage of the lubricating grease sealed in the bearing and prevent rainwater, dust, etc. from entering the bearing from the outside.

  As shown in an enlarged view in FIG. 13, the outer-side seal 36 includes a core metal 37 press-fitted into the outer-side end portion of the outer member 5 via a predetermined scissors, and vulcanized adhesion to the core metal 37. The seal member 38 is integrally formed with an integral seal.

  The core metal 37 is formed into a substantially L-shaped cross section by press working from an austenitic stainless steel plate or a cold rolled steel plate, and is a cylindrical fitting portion 37a that is press-fitted into the outer periphery 5c of the outer member 5; A disc portion 37b extending radially inward from the fitting portion 37a and closely contacting the outer end surface 5d of the outer member 5, and extending radially inward from the disc portion 37b via an inclined portion 37c. And an inner diameter portion 37d.

  On the other hand, the seal member 38 is made of a synthetic rubber such as NBR, and is formed in a bifurcated shape outward in the radial direction, and the inner ring 7 and the inner ring 7 are slidably contacted with a base portion 3b having a circular cross section in a predetermined axial direction. And a grease lip 38b slidably in contact with the outer diameter surface 7d via a predetermined radial shimiro. In addition to NBR, examples of the material of the seal member 38 include ACM, FKM, or silicon rubber having excellent heat resistance and chemical resistance, such as HNBR and EPDM having excellent heat resistance. Can do.

  Thus, in this embodiment, since the seal 36 is externally fitted to the end of the outer member 5, the seal 36 can be mounted after the wheel bearing 2 is assembled. Can be achieved.

  Also in this embodiment, after the outer ring 6 is press-fitted and fixed to the outer member 5, the double row outer rolling surfaces 6 a and 6 a are ground and the outer side inner ring 7 is a hub as in the above-described embodiment. Since the inner rolling surface 7a and the small end surface 7b are ground after being press-fitted and fixed to the small-diameter step portion 4 of the wheel 1, an inexpensive material with low cleanliness is used for the outer member 5 and used as the rolling surface. The amount of high-purity and high-priced material used is reduced as much as possible to reduce the cost, and the dimensional change of the rolling surfaces 6a and 7a due to the press-fitting of the outer ring 6 and the inner ring 7 can be prevented, and the bearing clearance is reduced. Adjustment can be facilitated.

  FIG. 14 is a longitudinal sectional view showing a fourth embodiment of the wheel bearing device according to the present invention, FIG. 15 is an enlarged view of a main part showing the wheel bearing of FIG. 14, and FIGS. FIG. 17 is an explanatory view showing a manufacturing method of the outer member of FIG. 14, and FIG. 17 is an explanatory view showing a manufacturing method of the wheel bearing device of FIG. The fourth embodiment is basically different from the above-described embodiment (FIG. 1) only in the configuration of the outer member and the cap, except for the same parts and parts having the same functions or parts and parts. Are given the same reference numerals and their detailed description is omitted.

  The wheel bearing device shown in FIG. 14 is for a driven wheel called the first generation, and is press-fitted into the hub wheel 1 and the hub wheel 1 to rotate the hub wheel 1 with respect to a knuckle (not shown). The main structure is a wheel bearing 39 which is freely supported. The wheel bearing 39 includes an outer member 40, an outer ring 6 press-fitted and fixed to the outer member 40, a pair of inner rings 7 and 8 inserted in the outer ring 6, the inner rings 7 and 8, and the outer ring 6. Are provided with double-row rolling elements 9, 9 accommodated in between.

  The outer member 40 is formed from a plate material or pipe material made of cold-rolled steel plate or carbon steel such as S45C by pressing or rolling (hereinafter referred to as plastic working), and is attached to a knuckle on the outer periphery. The cylindrical fitting surface 10 which has 40a integrally and the outer ring | wheel 6 is fitted by the inner periphery is formed. In addition, as a material of the outer member 40, carburized steel such as SCr420 and SCM415 can be exemplified.

  Further, a seal 12 is attached to the opening of the annular space formed between the outer member 40 and the inner ring 7 on the outer side, and a cap 41 is attached to the opening on the inner side of the outer member 40. This prevents leakage of lubricating grease sealed inside the bearing and prevents rainwater, dust, etc. from entering the bearing from the outside.

  As shown in an enlarged view in FIG. 15, the outer member 40 has a flange portion 10 a formed integrally on the inner side of the fitting surface 10, and an annular retaining ring groove 14 formed on the outer side. The outer ring 6 is positioned and fixed in the axial direction by a retaining ring 15 mounted in the retaining ring groove 14 and the flange portion 10a.

  A cap 41 is attached to the outer member 40 to close the inner side opening of the outer member 40. The cap 41 has corrosion resistance and is formed into a substantially U-shaped cross section by pressing from a non-magnetic austenitic stainless steel plate so as not to adversely affect the sensing performance of a rotational speed sensor (not shown). A cylindrical fitting portion 41a that is press-fitted into the inner periphery of the end portion on the inner side of the member 40, and the magnetic encoder 18 from the fitting portion 41a through the reduced diameter portion 41b face each other through a slight axial clearance, A bottom portion 41 c that covers an end portion on the inner side of the hub wheel 1 is provided.

  An elastic member 42 made of synthetic rubber such as NBR is integrally joined to the reduced diameter portion 41b by vulcanization adhesion. This elastic member 42 is elastically deformed and pressure-bonded to the outer member 40 when the cap 41 is fitted, thereby improving the airtightness of the fitting portion 41a.

  Here, in the present embodiment, the plate thickness t0 of the fitting portion 41a and the reduced diameter portion 41b is set to be thicker than the plate thickness t1 of the bottom portion 41c (t0> t1). As a result, the sensing performance of the rotational speed sensor is further improved, and the strength and rigidity of the cap 41 are increased, so that the cap 41 can be prevented from being deformed when fitted. And it can be set as the separate pilot part used as the fitting part of a knuckle, the shape of the outer member 40 can be simplified, and cost reduction can be achieved further.

Next, the manufacturing method of the wheel bearing 39 is demonstrated using FIG. 16, FIG.
As shown in FIG. 16 (a), the outer peripheral surface of the outer member 40, including the vehicle body mounting flange 40a, the annular groove 5a, and the like, and the inner peripheral surface of the fitting surface 10, the flange portion 10a, the retaining ring groove 14, and the like. Each is formed by turning. Then, the outer ring 6 ′ is press-fitted into the fitting surface 10, and a retaining ring 15 is mounted in the retaining ring groove 14, and the outer ring 6 ′ is positioned and fixed by the retaining ring 15 and the flange portion 10 a. In addition, the outer ring 6 ′ is turned in a state in which the outer surface 6b and the width surface 6c of the double row outer rolling surfaces 6a ′ and 6a ′ are left with a grinding allowance, and after being subjected to heat treatment (sublimation quenching). The outer peripheral surface 6b and the width surface 6c excluding the double row outer rolling surfaces 6a ′ and 6a ′ are ground.

  Next, as shown in (b), after the outer ring 6 ′ is press-fitted and fixed to the outer member 40, the outer ring 6 ′ is totally connected to the outer ring 6 ′ with the shoe 24 being in sliding contact with the outer peripheral surface of the outer member 40. A grinding wheel 25 of the mold is inserted. Then, as shown in (c), the double-row outer rolling surfaces 6a ′ and 6a ′ are simultaneously ground by the grinding wheel 25 formed in a predetermined shape and size, and at the same time by a super grindstone (not shown). -Finished to dimensions. Thus, after the outer ring 6 is press-fitted and fixed to the outer member 40, the double-row outer raceway surfaces 6a and 6a are ground, so an inexpensive material with low cleanliness is used for the outer member 40, The cost is reduced by reducing the amount of high-purity and high-priced material used as a rolling surface as much as possible, and the cost is reduced by eliminating plastic processing and grinding of the fitting surface 10 of the outer member 40. Can be achieved. Further, the dimensional change of the double row outer rolling surfaces 6a, 6a due to the press-fitting of the outer ring 6 'can be prevented, and the bearing clearance can be easily adjusted.

  On the other hand, the hub wheel 1 is subjected to heat treatment (induction hardening) after turning the outer peripheral surfaces of the wheel mounting flange 3, the shoulder portion 1a, the small-diameter step portion 4 and the like, as in the above-described embodiment, and then subjected to heat treatment (induction hardening). The inner ring 7 ′ on the outer side is press-fitted into the small-diameter step portion 4. The inner ring 7 ′ is press-fitted and fixed to the small-diameter step portion 4 of the hub wheel 1, and then the inner rolling surface 7 a, the small end surface 7 b, and the counter portion 27 are ground by a grinding wheel (not shown) formed in a predetermined shape and size. Are simultaneously ground and finished to a predetermined shape and size by a super grindstone (not shown). In this way, since the inner rolling surface 7a is ground after the outer side inner ring 7 is press-fitted and fixed to the small-diameter step portion 4 of the hub wheel 1, the dimensional change of the inner rolling surface 7a due to the inner ring 7 ′ is press-fitted. Can be prevented, and the adjustment of the clearance of the bearing can be facilitated.

  As shown in FIG. 17, the wheel bearing 39 is assembled by press-fitting and fixing the seal 12 to the outer end of the outer ring 6 and the rolling elements 9 and the cage 11 on the outer rolling surface 6a on the outer side. Assembly is installed. In this state, the outer member 40 is extrapolated to the hub wheel 1, and the outer rolling element 9 is accommodated between the outer rolling surface 6 a of the outer ring 6 and the inner rolling surface 7 a of the inner ring 7. Thereafter, the assembly of the rolling elements 9 and the retainer 11 is mounted on the inner-side outer raceway 6a, and the inner-side inner ring 8 is press-fitted into the small-diameter step portion 4. Finally, the end portion of the small-diameter step portion 4 is plastically deformed to form a crimped portion 4a, and the pair of inner rings 7 and 8 are applied to the hub wheel 1 with a predetermined bearing preload applied by the crimped portion 4a. Fixed.

  According to the manufacturing method of the present invention, the variation in the groove bottom dimension between the inner rolling surface 7a of the inner ring 7 on the outer side and the outer rolling surface 6a of the outer ring 6 has conventionally been different from the hub ring 1 and the outer ring 6 in the inner ring 7. It was confirmed that the outer member 40 having a variation of about ± 0.060 mm in the press-fitted state can be suppressed to a variation of ± 0.030 mm. That is, in the prior art, the inner ring 7 and the outer ring 6 have their rolling surfaces ground before being press-fitted and are press-fitted into the hub wheel 1 and the outer member 40, respectively. Therefore, there are variations associated with grinding and variations associated with press-fitting. However, according to the manufacturing method according to the present invention, since grinding is performed after press-fitting, only variations associated with grinding occur. As a result, the variation in roundness of the outer rolling surface 6a of the outer ring 6 is improved. Specifically, conventionally, for example, the roundness is about 0.010 to 0.020 mm (radius method), and is affected by the roundness shape of the press-fit portion of the outer member 40. That is, the phase and shape of the roundness of the outer rolling surface 6a of the outer ring 6 when the outer member 40 is press-fitted and the roundness of the press-fitted portion of the outer member 40 after the outer ring 6 is pulled out substantially coincide. On the other hand, in the manufacturing method according to the present invention, the roundness can be suppressed to 0.005 mm or less and is not affected by the roundness shape of the press-fitting portion of the outer member 40.

  FIG. 18 is a longitudinal sectional view showing a fifth embodiment of the wheel bearing device according to the present invention. The fifth embodiment basically differs from the above-described fourth embodiment (FIG. 14) only in the configuration of the outer member, and other parts and parts having the same parts or the same functions. Are denoted by the same reference numerals, and detailed description thereof is omitted.

  The wheel bearing device shown in FIG. 18 is for a driven wheel called the first generation, and is pressed into the hub wheel 1 and the hub wheel 1 to rotate the hub wheel 1 with respect to a knuckle (not shown). The main structure is a wheel bearing 43 which is supported freely.

  The wheel bearing 43 includes an outer member 44, an outer ring 6 press-fitted and fixed to the outer member 44, a pair of inner rings 7 and 8 inserted in the outer ring 6, the inner rings 7 and 8, and the outer ring 6. Are provided with double-row rolling elements 9, 9 accommodated in between.

  The outer member 44 is formed by plastic working from a plate material made of a cold rolled steel plate or carbon steel such as S45C, and integrally has a vehicle body mounting flange 40a to be attached to the knuckle on the outer periphery, and the outer ring 6 is on the inner periphery. A cylindrical fitting surface 10 to be fitted is formed.

  A seal 32 is attached to the opening of the annular space formed between the outer member 44 and the base 3 b of the wheel mounting flange 3 of the hub wheel 1 and the inner ring 7 on the outer side, and the outer member 44. A cap 41 is attached to the opening on the inner side to prevent leakage of the lubricating grease sealed inside the bearing and prevent rainwater, dust, etc. from entering the bearing from the outside.

  Here, the outer end surface 31a of the outer member 44 is formed to extend in the axial direction, and faces the inner side surface 3c of the wheel mounting flange 3 via a slight axial clearance to form a labyrinth seal 35. doing. This prevents muddy water or the like from directly entering the seal 32 and improves the durability of the seal 32.

  Also in this embodiment, after the outer ring 6 is press-fitted and fixed to the outer member 44, the double-row outer rolling surfaces 6a, 6a are ground and the inner ring 7 on the outer side is also a hub. Since the inner rolling surface 7a and the small end surface 7b are ground after being press-fitted and fixed to the small-diameter step portion 4 of the wheel 1, an inexpensive material with low cleanliness is used for the outer member 44, which is used as the rolling surface. The amount of high-purity and high-priced material used is reduced as much as possible to reduce the cost, and the dimensional change of the rolling surfaces 6a and 7a due to the press-fitting of the outer ring 6 and the inner ring 7 can be prevented, and the bearing clearance is reduced. Adjustment can be facilitated.

  FIG. 19 is a longitudinal sectional view showing a sixth embodiment of the wheel bearing device according to the present invention. The sixth embodiment is basically different from the above-described fourth embodiment (FIG. 14) only in the seal configuration, and other parts and parts having the same function or the same function are used. The same reference numerals are assigned and detailed description thereof is omitted.

  The wheel bearing device shown in FIG. 19 is for a driven wheel called the first generation, and is pressed into the hub wheel 1 and the hub wheel 1 to rotate the hub wheel 1 with respect to a knuckle (not shown). The main structure is a wheel bearing 39 which is freely supported.

  The wheel bearing 39 includes an outer member 40, an outer ring 6 press-fitted and fixed to the outer member 40, a pair of inner rings 7 and 8 inserted in the outer ring 6, the inner rings 7 and 8, and the outer ring 6. Are provided with double-row rolling elements 9, 9 accommodated in between.

  A seal 36 is attached to the opening of the annular space formed between the outer member 40 and the base portion 3b of the wheel mounting flange 3 of the hub wheel 1 and the inner ring 7 on the outer side. A cap 41 is attached to the opening on the side to prevent leakage of lubricating grease sealed inside the bearing and prevent rainwater, dust, etc. from entering the bearing from the outside.

  Thus, in this embodiment, since the seal 36 is externally fitted to the end portion of the outer member 40, the seal 36 can be mounted after the wheel bearing 39 is assembled. Can be achieved.

  Also in this embodiment, after the outer ring 6 is press-fitted and fixed to the outer member 40, the double-row outer rolling surfaces 6a, 6a are ground and the inner ring 7 on the outer side is also a hub. Since the inner rolling surface 7a and the small end surface 7b are ground after being press-fitted and fixed to the small-diameter step portion 4 of the wheel 1, an inexpensive material with low cleanliness is used for the outer member 40 and used as the rolling surface. The amount of high-purity and high-priced material used is reduced as much as possible to reduce the cost, and the dimensional change of the rolling surfaces 6a and 7a due to the press-fitting of the outer ring 6 and the inner ring 7 can be prevented, and the bearing clearance is reduced. Adjustment can be facilitated.

  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 can be applied to a wheel bearing device having a first to third generation structure regardless of whether it is for driving wheels or driven wheels.

1 Hub Wheel 1a Shoulder 1b Corner 2, 30, 39, 43 Wheel Bearing 3 Wheel Mounting Flange 3a Hub Bolt 3b Inner Side Base 3c of Wheel Mounting Flange Inner Side Side 4 of Wheel Mounting Flange Small Diameter Step 4a Caulking Portions 5, 31, 40, 44 Outer member 5a Annular groove 5b, 40a Car body mounting flange 5c Outer member outer side outer periphery 5d, 31a Outer member outer side end surface 6, 6 'Outer ring 6a, 6a 'Outer rolling surface 6b Outer ring outer diameter surface 6c Outer ring width surface 7, 7', 8 Inner ring 7a, 7a 'Inner rolling surface 7b, 7b' Small end surface 7c Large end surface 7d Inner ring outer diameter surface 7e Inner ring inner diameter surface DESCRIPTION OF SYMBOLS 9 Rolling body 10 Fitting surface 10a Gutter part 11 Cage 12, 32, 36 Seal 13, 41 Cap 13a, 37a, 41a Fitting part 13b, 41b Reduced diameter part 13c, 41c Bottom part 14 Retaining ring groove 15 Retaining ring 6 Pulsar ring 17 Support ring 17a, 20a Cylindrical portion 17b, 20b Standing plate portion 18 Magnetic encoder 19 Seal plate 20 Slinger 21, 33, 37 Core metal 22, 34, 38 Seal member 22a Base portion 22b, 34a of seal member Side lip 22c, 34b, 38a Dustrip 22d, 34c, 38b Grease lip 23, 42 Elastic member 23a Annular projection 24 Shoe 25, 26 Grinding wheel 27 Counter part 28, 29 Hardened layer 37b Disk part 37c Inclined part 37d Inner diameter part 51 Hub wheel 52 Knuckle 53 Wheel bearing 54 Wheel mounting flange 55 Small diameter step portion 56, 60a Serration 57 Constant velocity universal joint 58 Outer joint member 59 Shoulder portion 60 Stem portion 60b Screw portion 61 Fixed nut 62 Outer ring 62a Outer rolling surface 63 Inner ring 63a Inner rolling Surface 63b Small end surface 64 Ball 6 Cage 66, 67 Seal 68 Counter part 68a Cylindrical part 68b Taper part 69 Small outer diameter 70 Large outer diameter 71 Grinding wheel A Connecting part d0 Inscribed circle diameter d1 of inner raceway groove bottom diameter d2 Outside of counter part Diameter t0 Thickness of cap fitting portion t1 Thickness of cap bottom portion Wo Outer ring width dimension Wi Outer ring width W1 Outer side inner ring width dimension W2 Inner side inner ring width dimension δ Clicking margin θ Taper Inclination angle

Claims (12)

A hub wheel integrally having a wheel mounting flange for mounting a wheel at one end and a small-diameter step portion extending in the axial direction from the wheel mounting flange via a shoulder portion on the outer periphery, and press-fitted into the hub wheel In the manufacturing method of the wheel bearing device provided with the wheel bearing for rotatably supporting the hub wheel relative to the knuckle,
The wheel bearing integrally has a vehicle body mounting flange for mounting to the knuckle on the outer periphery, and an outer member having a cylindrical fitting surface formed on the inner periphery, and a fitting surface of the outer member The outer ring was press-fitted into the inner ring and formed with a double row outer raceway on the inner circumference, and the inner raceway was formed on the outer circumference and opposed to the outer raceway of the double row on the outer circumference. A pair of inner rings and a double row rolling element that is rotatably accommodated between the rolling surfaces of the inner and outer rings via a cage, and after the outer ring is press-fitted and fixed to the outer member, A method for manufacturing a wheel bearing device, characterized in that a double row outer rolling surface is ground.   The method for manufacturing a wheel bearing device according to claim 1, wherein the fitting surface of the outer member is left turned.   The method for manufacturing a wheel bearing device according to claim 1, wherein the outer member is formed of a plate material by plastic working.   The method for manufacturing a wheel bearing device according to claim 1, wherein the inner raceway is ground after an inner ring on the outer side of the pair of inner rings is press-fitted into the hub ring.   The wheel bearing device manufacturing method according to claim 1, wherein a width dimension of the outer ring is set smaller than a set width of the pair of inner rings.   The method for manufacturing a wheel bearing device according to claim 5, wherein an end surface of the outer ring is set so as not to hang on an outer diameter surface of the inner ring.   A hardened layer is formed on the outer circumference of the hub ring by induction hardening in a range of surface hardness of 50 to 64 HRC, and this hardened layer is set only at the shoulder and at the corner of the shoulder and the small diameter step. The manufacturing method of the wheel bearing apparatus of Claim 1.   2. The wheel bearing device according to claim 1, wherein a seal is attached to an outer end portion of the outer member, and an opening of an annular space formed between the outer member and an inner ring is sealed. Production method.   The wheel bearing device manufacturing method according to claim 1, wherein an outer end face of the outer member is opposed to an inner side face of the wheel mounting flange via an axial clearance, and a labyrinth seal is formed.   2. The cap according to claim 1, wherein a cap is attached to an inner side end of the outer member, and the cap is formed into a U-shaped cross section by pressing from a non-magnetic austenitic stainless steel plate having corrosion resistance. Manufacturing method of wheel bearing device. A hub wheel integrally having a wheel mounting flange for mounting a wheel at one end and a small-diameter step portion extending in the axial direction from the wheel mounting flange via a shoulder portion on the outer periphery, and press-fitted into the hub wheel In the wheel bearing device comprising a wheel bearing for rotatably supporting the hub wheel with respect to the knuckle,
The wheel bearing integrally has a vehicle body mounting flange for mounting to the knuckle on the outer periphery, and an outer member having a cylindrical fitting surface formed on the inner periphery, and a fitting surface of the outer member The outer ring was press-fitted into the inner ring and formed with a double row outer raceway on the inner circumference, and the inner raceway was formed on the outer circumference and opposed to the outer raceway of the double row on the outer circumference. A pair of inner rings and a double row rolling element that is rotatably accommodated between the rolling surfaces of the inner and outer rings via a cage, and after the outer ring is press-fitted and fixed to the outer member, A bearing device for a wheel, characterized in that a double row outer rolling surface is ground. A hub wheel integrally having a wheel mounting flange for mounting a wheel at one end and a small-diameter step portion extending in the axial direction from the wheel mounting flange via a shoulder portion on the outer periphery, and press-fitted into the hub wheel A wheel bearing for rotatably supporting the hub wheel with respect to a knuckle;
The wheel bearing integrally has a vehicle body mounting flange for mounting to the knuckle on the outer periphery, and an outer member having a cylindrical fitting surface formed on the inner periphery, and a fitting surface of the outer member The outer ring was press-fitted into the inner ring and formed with a double row outer raceway on the inner circumference, and the inner raceway was formed on the outer circumference and opposed to the outer raceway of the double row on the outer circumference. In a wheel bearing device comprising a pair of inner rings and a double-row rolling element that is accommodated in a freely rolling manner between both rolling surfaces of the inner and outer rings via a cage,
The wheel bearing device according to claim 1, wherein the outer member is made of a material having a cleanliness lower than that of the outer ring.

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