JP5166754B2 - Wheel bearing device - Google Patents

Description

  The present invention relates to a wheel bearing device for rotatably supporting the wheel of a vehicle such as an automobile, and more particularly, to a wheel bearing device that achieves light weight, compactness, and low cost, as well as improved sealing performance and bearing accuracy. It is about.

  2. Description of the Related Art Conventionally, a wheel bearing device for supporting a wheel of an automobile or the like supports a hub wheel for mounting a wheel rotatably via a double row rolling bearing, and includes a drive wheel and a driven wheel. For structural reasons, an inner ring rotation method is generally used for driving wheels, and both an inner ring rotation method and an outer member rotation method are generally used for driven wheels. This 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, and an outer member. 2nd generation structure with body mounting flange or wheel mounting flange formed directly on the outer periphery of the wheel, 3rd generation structure with one inner rolling surface formed directly on the outer periphery of the hub wheel, or constant speed with the hub wheel It is roughly classified into a fourth generation structure in which the inner rolling surface is directly formed on the outer periphery of the outer joint member of the universal joint.

  Conventionally, an angular ball bearing having a structure in which an inner ring and an outer ring (outer member) are formed by pressing from a steel plate is known. For example, the angular ball bearing 50 shown in FIG. 6 is used in a magnetic hard disk drive or the like, but the outer ring 51 and the pair of inner rings 52 and 53 are formed from a stainless steel plate by pressing or rolling.

  The outer ring 51 is formed with an annular convex portion 51a protruding radially inward at a substantially middle portion of the inner peripheral surface, and outer rolling surfaces 51b and 51c are formed on inner peripheral surfaces on both sides of the annular convex portion 51a. Yes. The outer ring 51 has an outer peripheral surface fitted into a hole in the housing 54, and a flange 51 d formed at one end is brought into contact with the end surface of the housing 54 to perform axial positioning. An annular recess 51e is formed on the outer peripheral surface of the outer ring 51 by the annular protrusion 51a. The annular recess 51e is filled with an adhesive, and the outer ring 51 is fixed to the hole of the housing 54.

  On the other hand, the inner rings 52 and 53 are respectively fitted inside the double row outer raceway surfaces 51b and 51c of the outer ring 51 from both sides in the axial direction. Curved shoulder portions 52a and 53a are formed on the outer circumferences of the outer ends in the axial direction of the inner rings 52 and 53, and inner rolling surfaces 52b and 53b are formed on the curved shoulder portions 52a and 53a. The double rows of balls 56, 56 are arranged between the inner rolling surfaces 52b, 53b and the outer rolling surfaces 51b, 51c of the outer ring 51, and are retained by the cages 57, 57 for each row. Is retained.

  On the inner peripheral surfaces of the inner rings 52 and 53, fitting portions 52c and 53c that are fitted into the shaft member 55 with clearance are formed. After the inner rings 52, 53 are fitted into the shaft member 55 in the axial direction, a cylindrical weight 59 having a constant weight is placed on the curved shoulder 52 a of one inner ring 52, and the weight of the weight 59 The other inner ring 53 is pressed via the inner ring 52, the ball 56, the outer ring 51, and the ball 56, and the curved shoulder portion 53 a is fitted until it comes into contact with the flange portion 55 a of the shaft member 55. Thereby, an appropriate preload is set for the angular ball bearing 50.

When this gap fitting is completed, the adhesive 60 is filled in the gap between the curved shoulder portion 52a of the one inner ring 52 and the shaft member 55, and this adhesive 60 prevents the one inner ring 52 from being fitted off. The flange portion 55a of the shaft member 55 prevents the other inner ring 53 from being fitted off.
Japanese Utility Model Publication No. 6-1835

  However, when this type of angular contact ball bearing made of a press is used as a wheel bearing, a sealing device (not shown) is formed between the outer ring 51 and the inner rings 52 and 53 in order to ensure sealing performance. Although it is necessary to attach to the opening of the space, not only the number of parts increases, but also a structural change for securing the sealing space is unavoidable, and the number of assembly steps increases along with the processing cost, and the cost increase cannot be denied. Furthermore, it has been difficult to equalize the accuracy of each part, in particular, the accuracy of each rolling surface, as compared with a conventional machined bearing.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a wheel bearing device that achieves light weight, compactness, and cost reduction, and also improves sealing performance and bearing accuracy. .

In order to achieve such an object, the invention according to claim 1 of the present invention includes an outer member in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery, and a wheel mounting flange at one end. And a hub wheel formed with a small-diameter stepped portion extending in the axial direction from the wheel mounting flange through the shoulder portion, and a small-diameter stepped portion of the hub wheel is press-fitted through a predetermined shimiro to the outer periphery. A pair of inner rings formed with arc-shaped inner rolling surfaces facing the outer surfaces of the double rows, and double rows of balls accommodated between the inner races and both rolling surfaces of the outer member; A double-sided angular contact ball of a back-to-back type in which a small-diameter side end face of the inner ring abuts in a butted state, and a seal attached to an opening of an annular space formed between the outer member and the inner ring In the wheel bearing device that constitutes the bearing, the outer member and the inner ring are Together are formed by the ring processing, the shoulder portion of said inner ring comprising a land portion or the fitting portion of the two rolling run surface and the seal is formed to a predetermined size, accuracy grinding Rutotomoni, of the outer member Both end surfaces and the large-diameter side end surface of the inner ring are turned after rolling, and the outer-diameter surface of the outer member and the inner-diameter surface and small-diameter side end surface of the inner ring are formed with predetermined dimensions and accuracy by grinding. ing.

Thus, in the wheel bearing device of the first generation structure composed of a hub wheel integrally having a wheel mounting flange at one end and a double-row angular ball bearing of a back-to-back type, the outer member and the inner ring are pipes. together are formed by a rolling process from wood, both end faces of Ryotenhashi surface and predetermined dimensions inner ring shoulder portion by grinding to a land portion or the fitting portion of the seal, it is formed on the accuracy Rutotomoni, outer member The inner diameter large end face of the inner ring is turned after rolling, and the outer diameter surface of the outer member and the inner diameter face and the small diameter end face of the inner ring are formed with a predetermined size and accuracy by grinding. As a result, the yield can be improved, the cost can be reduced, and the same accuracy and sealing performance as those of conventional bearings can be secured.

  Preferably, as in the invention described in claim 2, cylindrical portions are formed at both ends of the outer member by rolling processing, and the seal is fitted into the cylindrical portions, and the inner ring has a larger diameter side. If a shoulder extending in the axial direction is formed at the end of the sleeve by rolling, and the seal lip of the seal is in sliding contact with the shoulder, a desired sealing property can be ensured.

  According to a third aspect of the present invention, the seal is formed of a slinger and an annular seal plate having a substantially L-shaped cross section and arranged to face each other. The seal plate is a side lip and a radial seal plate. A cylindrical portion is formed at both ends of the outer member by rolling, and the seal plate is fitted into the cylindrical portion, and a shoulder extending in the axial direction at the large-diameter end of the inner ring If the part is formed by rolling, the slinger is press-fitted into the shoulder, and the seal lip of the seal plate is slidably contacted with the slinger, a stronger sealing performance can be obtained.

  Further, as in the invention described in claim 4, if shoulder portions extending radially inward are formed at both ends of the outer member by rolling, and the seal is integrally joined to the shoulder portions. In addition, the number of parts can be reduced and the number of assembly steps can be greatly reduced, thereby further reducing the cost.

  According to a fifth aspect of the present invention, an outer joint member of a constant velocity universal joint is fitted into the hub wheel via a serration, and the pair of inner rings are connected to a shoulder portion of the hub wheel and the outer joint member. If a predetermined bearing preload is applied, the bearing rigidity is increased and the rolling fatigue life of the bearing is improved.

The wheel bearing device according to the present invention has an outer member in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery, and a wheel mounting flange at one end, and the wheel mounting flange. A hub wheel formed with a small-diameter step portion extending in the axial direction from the shoulder portion through the shoulder portion, and press-fitted into the small-diameter step portion of this hub ring through a predetermined shimoshiro, facing the outer rolling surface of the double row on the outer periphery A pair of inner rings formed with arc-shaped inner rolling surfaces, a double row of balls accommodated between both inner rings and the rolling surfaces of the outer member, and the outer member and the inner ring. In a wheel bearing device comprising a seal mounted on the opening of the formed annular space, the back end type double-row angular contact ball bearing is configured by abutting the end surface on the small diameter side of the inner ring in a butted state, The outer member and the inner ring are formed from a pipe material by rolling. Together, the shoulder portion of said inner ring comprising a land portion or the fitting portion of the two rolling run surface and the seal is formed to a predetermined size, accuracy grinding Rutotomoni, both end faces and the inner ring of the outer member The large-diameter end surface is turned after rolling, and the outer-diameter surface of the outer member and the inner-diameter surface and the small-diameter-side end surface of the inner ring are formed with a predetermined size and accuracy by grinding so that productivity Thus, the yield can be improved and the cost can be reduced, and the same accuracy and sealing performance as those of the conventional bearing can be secured.

  An outer member in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery, and a wheel mounting flange are integrally formed at one end, and extend axially from the wheel mounting flange via a shoulder. A hub ring having a cylindrical small-diameter stepped portion, and an arc-shaped inner rolling that is press-fitted into the small-diameter stepped portion of the hub ring through a predetermined shimoshiro and faces the outer rolling surface of the double row on the outer periphery. A pair of inner rings formed with surfaces, a double row of balls accommodated between the rolling surfaces of the inner ring and the outer member, and an opening in an annular space formed between the outer member and the inner ring A small-diameter side end face of the inner ring abuts in a butted state to form a back-to-back type double row angular ball bearing, wherein the outer member and the inner ring Both ends of the outer member formed by rolling from pipe material The seal is fitted into the formed cylindrical portion, and a shoulder portion extending in the axial direction is formed at an end portion on the large diameter side of the inner ring, and a seal lip of the seal is slidably contacted with the shoulder portion, Both rolling surfaces, the fitting surface of the seal and the seal land portion are formed with predetermined dimensions and accuracy by grinding.

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 showing the wheel bearing of FIG. 1, and FIG. 3 (a) is an outward view of FIG. FIG. 4B is a longitudinal sectional view showing a single inner ring of FIG. 2, FIG. 4A is an enlarged view showing a modification of FIG. 2, and FIG. It is an enlarged view which shows a seal | sticker. In the following description, the side closer to the outer side of the vehicle in a state assembled to the vehicle is referred to as the outer side (left side in the drawing), and the side closer to the center is referred to as the inner side (right side in the drawing).

  This wheel bearing device has a first generation structure, and includes a hub wheel 1 and a wheel bearing 2 attached to the hub wheel 1. A constant velocity universal joint 3 is fitted into the hub wheel 1 so as to be able to transmit torque, and the hub wheel 1 and the constant velocity universal joint 3 are detachably integrated via a fixing nut 4.

  The hub wheel 1 has a wheel mounting flange 5 for mounting a wheel (not shown) at one end portion on the outer side, and a cylindrical shape extending from the wheel mounting flange 5 to the outer periphery in the axial direction via a shoulder portion 1a. A small-diameter step portion 1b is formed, and a serration (or spline) 1c for torque transmission is formed on the inner periphery. The hub wheel 1 is made of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and remains as forged. In addition, a method of performing a tempering treatment after forging in order to increase the fatigue strength with respect to the bending strength, or by subjecting the surface hardness to a range of 58 to 64 HRC by induction hardening from the shoulder portion 1a to the small diameter step portion 1b. May be.

  The wheel bearing 2 is fitted into a knuckle 6, and as shown in an enlarged view in FIG. 2, an outer member 7 having double rows of arc-shaped outer rolling surfaces 7a, 7a formed on the inner periphery, and an outer periphery on the outer member 7. A pair of inner races 8 and 8 formed with arcuate inner raceway surfaces 8a and 8a facing these double row outer raceway surfaces 7a and 7a, and cages 9 and 9 between both raceway surfaces. Double-row balls 10 and 10 accommodated so as to roll freely, and seals 11 attached to both ends of the outer member 7 are provided. The small-diameter (front) side end faces 8b, 8b of the inner rings 8, 8 abut each other in a butted state to constitute a so-called back-to-back type double row angular ball bearing.

  The seal 11 is composed of a core metal 11a fitted to the cylindrical portion 13 of the outer member 7, and a seal member 11b integrally joined to the core metal 11a by vulcanization adhesion or the like, and made of an elastomer such as nitrile rubber, It has a pair of radial lips. In addition, leakage of grease sealed in the bearing and foreign matter such as rainwater and dust from the outside are prevented from entering the bearing.

  As shown in FIG. 1, the constant velocity universal joint 3 includes an outer joint member 15, a joint inner ring 16, a cage 17, and a torque transmission ball 18. The outer joint member 15 integrally includes a cup-shaped mouth portion 19, a shoulder portion 20 that is a bottom portion of the mouth portion 19, and a shaft portion 21 that extends from the shoulder portion 20 in the axial direction. A serration 21a that engages with the serration 1c of the hub wheel 1 is formed on the outer periphery of the shaft portion 21, and a male screw 21b is formed at the end of the serration 21a. The outer joint member 15 is fitted into the hub wheel 1 via the serrations 1c and 21a until the shoulder 20 abuts the end surface of the inner ring 8, and the pair of inner rings 8 and 8 are connected to the shoulder 1a of the hub ring 1. In a state of being sandwiched between the shoulder portions 20 of the outer joint member 15, the hub wheel 1 is press-fitted into the small-diameter step portion 1 b through a predetermined squeeze. Further, a predetermined bearing preload is applied to the male screw 21b by tightening the fixing nut 4 with a predetermined tightening torque. As a result, the bearing rigidity is increased and the rolling fatigue life of the bearing is improved.

  Here, the outer member 7 and the inner ring 8 are formed by cold rolling a pipe material made of bearing steel such as SUJ2 or carburized steel such as SCr420 or SCM415. Then, SUJ2 is hardened to a surface hardness of 50 to 64 HRC by submerged or induction hardening, and carburized steel is carburized and quenched. Other examples of the material of the outer member 7 and the inner ring 8 include carbon steel such as SCM440, cold rolled steel plate (JIS standard SPCC system, etc.), S53C, and the like. In the case of cold rolled steel or carbon steel, at least the outer member 7 has double row outer rolling surfaces 7a, 7a, and the inner race 8 has an inner rolling surface 8a having a surface hardness of 50 to 64 HRC by induction hardening. The range is hardened to improve rolling fatigue life. These rolling surfaces 7a and 8a are formed with predetermined dimensions and accuracy by grinding. After that, superfinishing is performed as necessary.

Next, the configuration of the outer member 7 and the inner ring 8 will be described in detail with reference to FIG.
As shown in (a), the outer member 7 includes an annular protrusion 12 projecting radially inward from the pipe material, which is a raw material, by a cold rolling process, and the annular protrusion 12. Double-row arcuate outer rolling surfaces 7a and 7a are formed on both sides, and cylindrical portions 13 and 13 serving as fitting portions for the seal 11 are formed on both ends. Here, the cylindrical portion 13 is formed with a predetermined size and accuracy by grinding after cold rolling. Note that both end surfaces where burrs are generated in the rolling process are turned after the rolling process. Moreover, a grinding process is given as needed.

  On the other hand, as shown in (b), the inner ring 8 includes an arc-shaped inner rolling surface 8a and a shoulder portion extending in the axial direction from the inner rolling surface 8a by cold rolling from a pipe material as a material. 14 is formed. Here, the shoulder portion 14 becomes a seal land portion of the seal 11 and is formed with a predetermined size and accuracy by grinding after cold rolling. As with the outer member 7, both end surfaces where burrs are generated in the rolling process are turned after the rolling process. Moreover, a grinding process is given as needed.

  In the present embodiment, the outer member 7 and the inner ring 8 are formed by cold rolling from the pipe material, and the outer member 7 serving as a fitting surface between the rolling surfaces 7 a and 8 a and the seal 11 is formed. Since the cylindrical portion 13 and the shoulder portion 14 of the inner ring 8 that becomes the land portion of the seal 11 are formed by grinding, the productivity is improved, the yield is good, and the cost can be reduced. The same accuracy and sealability as the bearing can be secured. Here, the outer member 7 and the inner ring 8 are formed by cold rolling. However, the outer member 7 and the inner ring 8 may be formed by warm rolling, and the fitting of the knuckle 6 or the hub wheel 1 may be performed. The outer diameter surface of the outer member 7 serving as the mating surface, the inner diameter surface of the inner ring 8, and the small-diameter side end surface 8b of the inner ring 8 serving as the butting surface may be formed by grinding.

  FIG. 4A is a modification of the above-described embodiment (FIG. 2), but only the configuration of the seal is different. The same parts and parts as those in the above-described embodiment or parts and parts having the same functions are denoted by the same reference numerals and detailed description thereof is omitted.

  The wheel bearing 26 includes an outer member 7, a pair of inner rings 8, 8, and double-row balls 10, 10 accommodated between the rolling surfaces via the cages 9, 9 so as to roll freely, And a seal 27 attached to an opening of an annular space formed between the outer member 7 and the inner ring 8.

  The seal 27 is constituted by a so-called pack seal composed of a slinger 28 and an annular seal plate 29 arranged to face each other as shown in an enlarged view in FIG. The slinger 28 has a substantially L-shaped cross section when it is pressed from an austenitic stainless steel plate (JIS standard SUS304, etc.) or a rust-proof cold rolled steel plate (JIS standard SPCC, etc.). A cylindrical portion 28a that is press-fitted into the shoulder portion 14 of the inner ring 8, and a standing plate portion 28b that extends radially outward from the cylindrical portion 28a.

  The seal plate 29 is formed in a substantially L-shaped cross section, and includes a metal core 30 that is press-fitted into the cylindrical portion 13 of the outer member 7, and a seal member 31 that is integrally joined to the metal core 30 by vulcanization adhesion or the like. Become. The core 30 is formed by press working from an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a rust-proof cold rolled steel plate (JIS standard SPCC type or the like).

  On the other hand, the seal member 31 is made of an elastic member such as nitrile rubber, and includes a side lip 31a that is in sliding contact with the standing plate portion 28b of the slinger 28, and radial lips 31b and 31c that are in sliding contact with the cylindrical portion 28a and are formed in a bifurcated shape. Have. A labyrinth seal is formed by allowing the outer edge of the standing plate portion 28b of the slinger 28 and the cored bar 30 to face each other through a slight radial clearance, and prevents rainwater, dust, etc. from directly falling on the side lip 31a from the outside. And improve the sealing performance.

  Also in the present embodiment, the productivity is improved, the yield is good, the cost can be reduced, and the cylindrical portion 13 and the inner ring of the outer member 7 serving as a fitting surface between the rolling surfaces 7a and 8a and the seal 23 are also provided. Since the eight shoulder portions 14 are formed by grinding, it is possible to ensure the same accuracy as that of a conventional bearing and obtain a stronger sealing performance.

  FIG. 5 is a longitudinal sectional view showing a second embodiment of the wheel bearing device according to the present invention. In this embodiment, the outer member and the seal are basically different from the above-described embodiment, and other parts having the same parts or the same functions are denoted by the same reference numerals and detailed description thereof is omitted. To do.

  This wheel bearing device has a first generation structure, and includes a hub wheel 1 and a wheel bearing 22 attached to the hub wheel 1. The wheel bearing 22 includes an outer member 23 having double rows of outer rolling surfaces 7a and 7a formed on the inner periphery, and an inner rolling surface 8a facing the double rows of outer rolling surfaces 7a and 7a on the outer periphery. And a pair of balls 10 and 10 accommodated between the rolling surfaces via the cages 9 and 9 so as to roll freely.

  The outer member 23 is formed by cold rolling a pipe material made of carburized steel such as SCr420 or SCM415 having a relatively small amount of carbon. This outer member 23 has double rows of outer rolling surfaces 7a, 7a formed on the inner periphery, and a shoulder portion extending radially inward to the outer end side of these double rows of outer rolling surfaces 7a, 7a. 24 is formed. Elastomeric seals 25, 25 are integrally joined to these shoulder portions 24 by vulcanization adhesion. The shoulder portion 24 is formed with a stepped portion 24a by machining and is positioned by engaging with the flange portion 6a of the knuckle 6.

  As described above, in this embodiment, the seal 25 is integrally joined to the shoulder portion 24 of the outer member 23, and the seal 25 slides on the shoulder portion 14 of the inner ring 8 to leak the grease enclosed in the bearing. This prevents foreign matters such as rainwater and dust from entering the bearing from the outside. As a result, the number of parts can be reduced, the number of assembly steps can be greatly reduced, and the cost can be further reduced.

  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 generation structure including a hub wheel integrally having a wheel mounting flange at one end and a pair of inner rings press-fitted into the hub wheel. .

It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. It is an enlarged view which shows the wheel bearing of FIG. (A) is a longitudinal cross-sectional view which shows the outer member ring single-piece | unit of FIG. (B) is the longitudinal cross-sectional view which shows an inner ring single-piece | unit as above. (A) is an enlarged view which shows the modification of FIG. (B) is an enlarged view showing the seal of (a). It is a longitudinal cross-sectional view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention. It is a longitudinal cross-sectional view which shows the angular contact ball bearing of the structure where the conventional inner and outer ring | wheel was formed by press work.

Explanation of symbols

1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Hub wheel 1a, 14, 20, 24 ・ ・ ・ ・ ・ ・ Shoulder 1b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Small diameter step 1c, 21a ... Serrations 2, 22, 26 ... Wheel bearing 3 ...・ ・ ・ Constant velocity universal joint 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fixing nut 5 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Wheel mounting flange 6 .... Knuckle 6a ..... collar part 7, 23 .......... outside Member 7a ··· Outer rolling surface 8 ········· Inner ring 8a ···・ ・ ・ ・ ・ Inner rolling surface 8b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Small diameter side end surface 9 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・····················································································································· ··········································································································· ... Cylindrical part 15 ... Outer joint member 16 ... Fitting inner ring 17 ... ... Cage 18 ... Torque transmission ball 19 ... Mouse part 21 ...・ ・ ・ ・ ・ ・ ・ ・ ・ Shaft 21b ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Male screw 28 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Slinger 28b ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Standing plate 29 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Seal plate 31a ... Side lips 31b, 31c ... Radial lip 50 ... ... Angular ball bearings 51 ·············· Outer ring 51a ··· Outer rolling surface 51d ·············· Flange 51e ..... Inner rings 52a, 53a .... Curved shoulders 52b, 53b ..... Inner rolling surfaces 52c, 53c ... ... Fitting part 54 ... Housing 55 .................. Shaft member 55a ...・ ・ ・ ・ Hut 56 ……・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Ball 57 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Retainer 59 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Weight 60 ... ·············adhesive

Claims (5)

An outer member in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery;
A hub wheel integrally having a wheel mounting flange at one end and a small-diameter step portion extending in the axial direction from the wheel mounting flange via the shoulder portion, and a predetermined squeeze through the small-diameter step portion of the hub wheel A pair of inner rings formed with an arc-shaped inner rolling surface facing the outer rolling surface of the double row on the outer periphery,
A double row of balls accommodated between both rolling surfaces of the inner ring and the outer member;
A seal attached to an opening of an annular space formed between the outer member and the inner ring,
In the wheel bearing device for forming the double-sided angular contact ball bearing of the back-to-back type by abutting the small-diameter side end face of the inner ring in a butted state,
The outer member and the inner ring are formed from a pipe material by rolling, and both the rolling surfaces and the shoulder portion of the inner ring serving as a land portion or a fitting portion of the seal have predetermined dimensions and accuracy by grinding. formed Rutotomoni, with both end faces and the large diameter side end face of the inner ring of the outer member is turning after rolling process, the outer diameter surface and the inner ring of the radially inner surface and a small-diameter side end surface of the outer member grinding A wheel bearing device characterized by being formed with predetermined dimensions and accuracy by machining .   Cylindrical portions are formed at both ends of the outer member by rolling processing, and the seal is fitted into the cylindrical portion, and a shoulder portion extending in the axial direction at the end portion on the large diameter side of the inner ring is formed by rolling processing. The wheel bearing device according to claim 1, wherein the bearing lip is formed and slidably contacted with the seal lip of the seal.   The seal is formed of a slinger and an annular seal plate having a substantially L-shaped cross section and arranged to face each other. The seal plate has a side lip and a radial lip, and both end portions of the outer member. A cylindrical portion is formed by rolling processing, and the sealing plate is fitted into the cylindrical portion, and a shoulder portion extending in the axial direction is formed by rolling processing on the end portion on the large diameter side of the inner ring. The wheel bearing device according to claim 1, wherein a slinger is press-fitted, and a seal lip of the seal plate is slidably contacted with the slinger.   The wheel bearing device according to claim 1, wherein shoulder portions extending radially inward are formed at both end portions of the outer member by rolling, and the seal is integrally joined to the shoulder portions. An outer joint member of a constant velocity universal joint is fitted into the hub wheel via a serration, the pair of inner rings are sandwiched between a shoulder portion of the hub wheel and a shoulder portion of the outer joint member, and a predetermined bearing preload is generated. The wheel bearing device according to any one of claims 1 to 4, which is provided.

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