JP5417239B2 - Wheel bearing device and manufacturing method thereof - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a wheel bearing device that rotatably supports a drive wheel of a vehicle such as an automobile, and more particularly, to a wheel bearing device that is lightweight and compact and improves the strength and durability of the bearing, and a method for manufacturing the same. 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 an inner ring rotation method and an outer ring 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 is 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, for the purpose of reducing manufacturing costs, it has been considered to manufacture a hub ring and a double row angular ball bearing by deep drawing using a plate material. In this way, when manufacturing hub rings and double row angular contact ball bearings by deep drawing, if a thick plate is used to ensure sufficient strength as the base material, processing is difficult and the shape of the bent part・ Since the accuracy tends to decrease, a precision technique for improving the accuracy is required, and the production efficiency deteriorates despite the press working.

  As a solution to these problems, a wheel bearing device as shown in FIG. 5 is known. This wheel bearing device 50 is referred to as a third generation structure, and includes a hub ring 51 and a double-row angular ball bearing 52. The hub ring 51 is disposed radially outward on one shaft end side of the hollow shaft portion 53. A plurality of cut and raised pieces 54 extending in the direction and a plurality of tongue pieces 55 extending along the axial direction are provided alternately in the circumferential direction. The double-row angular ball bearing 52 is mounted on the shaft 53 and mounted with a wheel or brake rotor (not shown) positioned axially on one side of the cut-and-raised piece 54. It is fixed by a hub bolt 56 that is fixed through. Further, each tongue piece 55 is provided with a radially outwardly bulging portion 55a on the root side to form a pilot portion.

  The double row angular contact ball bearing 52 includes an outer member 57 in which double row outer rolling surfaces 57a and 57a are formed on the inner periphery, a hub wheel 51 in which one inner rolling surface 51a is formed on the outer periphery, An inner ring 58 that is externally fitted to the small-diameter stepped portion 53a of the shaft portion 53 of the hub wheel 51 and has an inner rolling surface 58a formed on the outer periphery, and double rows of balls 60 and 60 arranged via a cage 59 are provided. I have.

  A plurality of cut-and-raised pieces 61 extending radially outward and a plurality of tongue pieces 62 extending along the axial direction are provided alternately on one axial end side of the outer member 57 in the circumferential direction. It has been. A knuckle (not shown) is attached to one side of the cut and raised piece 61 in a state of being positioned in the axial direction and is fixed by a fixing bolt (not shown). In addition, the double row angular ball bearings 52 are centered with respect to the knuckle by defining the dimensional relationship so that each tongue piece 55 and the inner peripheral surface of the through hole of the knuckle are in close contact with each other. The end portion of the small diameter step portion 53a of the shaft portion 53 of the hub wheel 51 is bent radially outward by rolling caulking, and the inner ring 58 is fixed in the axial direction.

  The outer member 57 of the hub wheel 51 and the double-row angular ball bearing 52 is manufactured through a cold forging process, a cutting process, and a bending process using a cylindrical tube as a base material, so that it does not require a precision technique. At the same time, it is not necessary to retrofit parts for centering, so that the manufacturing cost can be reduced.

JP 2003-25803 A

  However, in this conventional wheel bearing device 50, when a large moment load is applied to the cut and raised pieces 54 and 61 of the hub wheel 51 and the outer member 57, the cut and raised pieces 54 and 61 are a single plate. However, there is a problem that strength and rigidity are insufficient and desired durability cannot be obtained. Further, the hub bolt 56 is fixed to the cut-and-raised piece 54 of the hub wheel 51, but the fixing force is insufficient because the press-fitted width of the hub bolt 56 is equal to the plate thickness, and the hub bolt 56 may be loosened.

  Here, if a thick plate material is used to ensure sufficient strength as the base material, it is difficult to process and the shape and accuracy of the bent part are likely to deteriorate, so precision technology to improve accuracy is required. Is done. In this case, in spite of the press working, not only the production efficiency is deteriorated and the manufacturing cost is increased, but also it is difficult to achieve the weight reduction.

  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 and a method for manufacturing the same, which are lightweight and compact and improve the strength and durability of the bearing.

  In order to achieve such an object, the invention described in 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 an outer end portion. A wheel mounting flange for mounting a wheel is integrally formed, and an arcuate inner rolling surface facing one of the double-row rolling surfaces on the outer periphery, and a cylindrical shape extending in the axial direction from the inner rolling surface A hub ring formed with a small-diameter step portion, and an arc-shaped inner rolling surface that is press-fitted into the small-diameter step portion of the hub ring via a predetermined shimiro and faces the other of the outer rolling surfaces of the double row on the outer periphery. An inner member formed of an inner ring formed with an inner ring, a double row of balls accommodated between the rolling surfaces of the inner member and the outer member via a cage, and the outer member. An end of the small-diameter step portion, and a seal attached to both end openings of the annular space formed between the inner member and the inner member. In the wheel bearing device in which the inner ring is fixed in the axial direction with respect to the hub ring by a caulking portion formed by plastically deforming the outer ring in the radial direction, the hub ring, the inner ring, and the outer member are plate members or It is formed from a pipe material by plastic working, and the wheel mounting flange is composed of a flange main body protruding in a petal shape at the outer end of the hub wheel, and a reinforcing plate joined to the flange main body, The reinforcing plate is formed from a plate material by plastic working, and includes a flange portion that comes into contact with an outer side surface of the flange body, and a cylindrical pilot portion that extends in an axial direction from the flange portion and guides the wheel and the brake rotor. In addition, an in-row portion protrudes from the outer diameter portion of the flange portion, and is externally fitted to the outer diameter of the flange main body via a predetermined fitting clearance.

  In this way, the hub wheel has a wheel mounting flange integrally at the outer end, and the crimped portion formed by plastically deforming the end of the small-diameter stepped portion radially outwardly with respect to the hub wheel. In a wheel bearing device in which the inner ring is fixed in the axial direction, the hub ring, the inner ring, and the outer member are formed by plastic working from a plate material or pipe material, and the wheel mounting flange is petal-like at the outer end of the hub ring. A flange body projecting from the flange body, and a reinforcing plate joined to the flange body, the reinforcing plate is formed by plastic processing from a plate material, and a flange portion that comes into contact with the outer side surface of the flange body, A cylindrical pilot portion that extends in the axial direction from the flange portion and guides the wheel and the brake rotor is provided. Because it is fitted externally through a fixed fitting clearance, it is possible to increase the strength and rigidity of the wheel mounting flange while reducing the weight of the hub wheel, and even if a large moment load is applied to this wheel mounting flange. Durability can be ensured.

  According to a second aspect of the present invention, a bolt insertion hole is formed by punching in the circumferential direction of the wheel mounting flange, and a predetermined chamfered portion is pressed at an edge of the bolt insertion hole. If formed by processing, the working efficiency can be improved and the cost can be reduced.

  If the thickness of the reinforcing plate is set to about 70 to 75% of the thickness of the flange main body as in the invention described in claim 3, the weight of the hub wheel can be reduced. It is possible to increase the strength and rigidity of the wheel mounting flange while achieving the plan.

  Further, as in the invention described in claim 4, if an annular groove having a predetermined width including the bolt insertion hole is formed on the outer side surface of the reinforcing plate by cutting, press-fitting of the hub bolt is performed. It is possible to suppress the influence of deformation to the side due to the minimum.

  Preferably, as in the invention described in claim 5, if the outer side surface of the reinforcing plate is secondarily cut after press-fitting a hub bolt into the bolt insertion hole, the side surface increased by press-fitting the hub bolt. The shake can be suppressed as much as possible.

  According to a sixth aspect of the present invention, a vehicle body mounting flange for being attached to a knuckle is integrally formed on the outer periphery of the outer member, and the vehicle body mounting flange is an end on the inner side of the outer member. A flange body projecting in a petal shape at the part, and a reinforcing plate joined to the flange body, and this reinforcing plate is formed from a plate material by plastic working and abuts against the inner side surface of the flange body A flange portion and a cylindrical pilot portion extending in an axial direction from the flange portion and fitted to the knuckle; and an inrow portion protruding from an outer diameter portion of the flange portion; If it is fitted on the diameter via a predetermined clearance, the strength and rigidity of the body mounting flange can be increased while reducing the weight of the outer member. Be loaded on the body mounting flange can be ensured durability.

  Moreover, if the thickness of the said reinforcement board is set to the thickness of about 70 to 75% with respect to the thickness of the said flange main body like invention of Claim 7, the weight reduction of an outer member will be carried out. The strength and rigidity of the vehicle body mounting flange can be increased while achieving the above.

  In the method invention according to claim 8 of the present invention, the outer member in which the double row arc-shaped outer rolling surface is integrally formed on the inner periphery and the wheel on the outer end are attached. The wheel mounting flange is integrated with an arcuate inner rolling surface facing one of the double row rolling surfaces on the outer periphery, and a cylindrical small-diameter step portion extending in the axial direction from the inner rolling surface. The formed hub ring and a small-diameter step portion of the hub ring are press-fitted through a predetermined scissors, and an arc-shaped inner rolling surface facing the other of the outer rolling surfaces of the double row is formed on the outer periphery. An inner member formed of an inner ring, a double row of balls accommodated between the rolling surfaces of the inner member and the outer member via a cage, the outer member and the inner member; And seals mounted at both end openings of the annular space formed between and the end of the small-diameter stepped portion In the method of manufacturing a wheel bearing device in which the inner ring is fixed in the axial direction with respect to the hub wheel by a caulking portion formed by plastic deformation in the wheel, the wheel mounting flange is an outer end of the hub wheel. It comprises a flange body projecting in a petal shape on the part and a reinforcing plate joined to the flange body, and this reinforcing plate is formed from a plate material by plastic working and abuts on the outer side surface of the flange body A flange portion and a cylindrical pilot portion that extends in the axial direction from the flange portion and guides the wheel and the brake rotor are provided, and an inrow portion protrudes from an outer diameter portion of the flange portion, and is provided outside the flange main body. Bolt insertion holes are punched out by punching in the circumferential direction with the flange body and the reinforcing plate being joined, with the flange body and the reinforcing plate being joined together. If this is done, the press-fitting width of the hub bolt can be secured, the hub bolt can be prevented from loosening over a long period of time and the fixing force can be increased, and the wheel mounting flange can be separated from the flange body and the reinforcing plate. Even so, the dimensions and position accuracy of the bolt insertion holes are improved. Therefore, the press-fitting work of the hub bolt is performed efficiently, and the hub bolt is not tilted and fixed by press-fitting.

  Preferably, as in the invention described in claim 9, if the bolt insertion hole is formed by punching from the flange main body side, the fracture surface of the inlet of the drill pin becomes a shearing surface, and harmful burrs, etc. Can be prevented, and a raised portion does not occur on the seating surface of the hub bolt.

  According to a tenth aspect of the present invention, a vehicle body attachment flange for being attached to a knuckle is integrally provided on the outer periphery of the outer member, and the vehicle body attachment flange is an end on the inner side of the outer member. A flange body projecting in a petal shape at the part, and a reinforcing plate joined to the flange body, and this reinforcing plate is formed from a plate material by plastic working and abuts against the inner side surface of the flange body A flange portion and a cylindrical pilot portion extending in an axial direction from the flange portion and fitted to the knuckle; and an inrow portion protruding from an outer diameter portion of the flange portion; Fixed if the bolt hole is punched out with the flange body and the flange part of the reinforcing plate being integrated together, with the flange body and the flange portion of the reinforcing plate being integrated together. The press-fitting width of the bolt can be secured, the fixing bolt can be prevented from loosening over a long period of time, and the fixing force can be increased, and the body mounting flange can be a separate body of the flange body and the reinforcing plate. Bolt pilot hole dimensions and position accuracy are 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 for mounting the wheel on the outer end. A hub wheel having an arcuate inner rolling surface facing one of the double-row rolling surfaces on the outer periphery, and a cylindrical small-diameter stepped portion extending in the axial direction from the inner rolling surface, And an inner member formed of an inner ring that is press-fitted into a small-diameter step portion of the hub wheel via a predetermined shimiro and has an arc-shaped inner rolling surface facing the other of the outer rolling surfaces of the double row on the outer periphery. And a double row of balls accommodated between the rolling surfaces of the inner member and the outer member via a cage, and the outer member and the inner member. And seals mounted at both ends of the annular space, and plastically deforming the end of the small diameter stepped portion radially outward. In the wheel bearing device in which the inner ring is fixed in the axial direction with respect to the hub ring by the formed crimping portion, the hub ring, the inner ring, and the outer member are formed from a plate material or a pipe material by plastic working, The wheel mounting flange is composed of a flange body projecting in a petal shape at the outer end of the hub wheel, and a reinforcing plate joined to the flange body, and the reinforcing plate is formed from a plate material by plastic working. A flange portion that contacts the outer side surface of the flange main body, a cylindrical pilot portion that extends in an axial direction from the flange portion and guides the wheel and the brake rotor, and an outer diameter portion of the flange portion Since the in-row portion protrudes from the flange body and is fitted on the outer diameter of the flange body through a predetermined fitting clearance, the weight of the hub wheel can be reduced and the vehicle can be reduced. It is possible to increase the strength and rigidity of the mounting flange, large moment load can be ensured durable be loaded on the wheel mounting flange.

  The wheel bearing device manufacturing method according to 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 for attaching the wheel to the outer end. A wheel mounting flange is integrally formed, and an arc-shaped inner rolling surface facing one of the double-row rolling surfaces and a cylindrical small-diameter step portion extending in the axial direction from the inner rolling surface are formed on the outer periphery. Hub ring, and an inner ring that is press-fitted into a small-diameter step portion of the hub ring through a predetermined shimiro and has an arc-shaped inner rolling surface facing the other of the double-row outer rolling surfaces on the outer periphery. An inner member, a double row of balls accommodated between the rolling surfaces of the inner member and the outer member via a cage, and the outer member and the inner member. And seals attached to both end openings of the annular space formed between the ends of the small-diameter stepped portion. In the method of manufacturing a wheel bearing device in which the inner ring is fixed in the axial direction with respect to the hub ring by a caulking portion formed by plastic deformation to the hub ring, the hub ring, the inner ring, and the outer member are plate members or pipe members. The wheel mounting flange is formed of a flange body projecting in a petal shape at the outer end of the hub wheel, and a reinforcing plate joined to the flange body. The plate is formed by plastic processing from the plate material, and the bolt insertion holes are punched in the circumferential direction evenly with the flange body and the reinforcing plate joined, ensuring the press-fitting width of the hub bolt The hub bolt can be prevented from loosening over a long period of time and the fixing force can be increased, and the wheel mounting flange is a separate body of the flange body and the reinforcing plate. Dimensions and positional accuracy of the bolt holes is improved even. Therefore, the press-fitting work of the hub bolt is performed efficiently, and the hub bolt is not tilted and fixed by press-fitting.

It is a longitudinal section showing a 1st embodiment of a bearing device for wheels concerning the present invention. It is a front view of FIG. It is explanatory drawing which shows the manufacturing process of the hub ring | wheel of FIG. 1, (a) shows a punching process, (b) shows a surface pressing process. (A) is a front view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention, (b) is principal part sectional drawing of (a). It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus.

  The outer member integrally formed with the outer circumferential rolling surface of the double-row arc shape on the inner periphery and the wheel mounting flange for attaching the wheel to the end portion on the outer side are integrally formed, and the double-row on the outer periphery. A hub ring formed with an arcuate inner rolling surface facing one of the rolling surfaces, a cylindrical small-diameter step portion extending in the axial direction from the inner rolling surface, and a predetermined diameter on the small-diameter step portion of the hub ring. An inner member formed by an inner ring that is press-fitted through an outer periphery and has an arc-shaped inner rolling surface facing the other of the outer rolling surfaces of the double row on the outer periphery, and the inner member and the outer member. Mounted in both ends of the annular space formed between the double-row balls accommodated between the rolling surfaces of the member so as to roll freely through a cage and the outer member and the inner member. A crimp portion formed by plastically deforming an end portion of the small-diameter step portion radially outward. In the method of manufacturing a wheel bearing device in which the inner ring is fixed in the axial direction with respect to the wheel ring, the hub ring, the inner ring, and the outer member are formed from a plate material or a pipe material by plastic working, and the wheel mounting flange is The flange body is composed of a flange body projecting in a petal shape at the outer end of the hub wheel, and a reinforcing plate joined to the flange body. The reinforcing plate is 70 to 75 with respect to the thickness of the flange body. %, The bolt insertion holes are punched from the flange body side in the circumferential direction with the flange body and the reinforcing plate being joined. It is installed.

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 a front view of FIG. 1, and FIG. 3 is an explanatory view showing a processing step of the hub wheel of FIG. (A) shows a punching process and (b) shows a surface pressing process. 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).

  This wheel bearing device is referred to as a third generation structure on the driven wheel side, and includes a plurality of balls 3, 3, which are accommodated so as to roll between the inner member 1 and the outer member 2, and both members 1, 2. And. The inner member 1 includes a hub ring 4 and an inner ring 5 press-fitted into the hub ring 4 through a predetermined shimiro.

  The hub wheel 4 integrally has a wheel mounting flange 6 for mounting a wheel (not shown) at an end portion on the outer side, and one (outer side) arcuate inner rolling surface 4a on the outer periphery. A cylindrical small diameter step portion 4c extending in the axial direction from the inner rolling surface 4a via the shoulder portion 4b is formed. Hub bolts 6a are implanted in the wheel mounting flange 6 in a circumferentially equal distribution, and circular holes 6b are formed between the hub bolts 6a. The circular hole 6b can not only contribute to weight reduction, but also a fastening jig such as a wrench can be inserted from the circular hole 6b in the assembly / disassembly process of the apparatus, and the work can be simplified.

  The inner ring 5 is formed with the other (inner side) arcuate inner rolling surface 5a on the outer periphery, and extends in the axial direction from the large diameter side of the inner rolling surface 5a. A cylindrical shoulder portion 7, a large end portion 8 formed by bending inward in the radial direction from the shoulder portion 7, and a cylindrical small end portion extending in the axial direction from the small diameter side of the inner rolling surface 5 a Part 9 is provided. The small end portion 9 is pressed into the small diameter step portion 4c in a state of abutting against the shoulder portion 4b of the hub wheel 4 to form a back-to-back type double row angular ball bearing, and the end portion of the small diameter step portion 4c is connected to the inner ring. 5 is fixed in the axial direction in a state where a predetermined bearing preload is applied by a caulking portion 4d formed by plastic deformation radially outward along the side surface of the large end portion 8 to constitute a so-called self-retained structure. ing. By adopting such a configuration, it is possible to form with a uniform thickness and high accuracy, to increase strength and rigidity, and to easily apply a desired bearing preload.

  The outer member 2 has a vehicle body mounting flange 10 to be attached to a knuckle (not shown) at an end on the inner side, an annular protrusion 11 protruding radially inward on the inner periphery, and the annular protrusion. Double-row arc-shaped outer rolling surfaces 2a and 2a are integrally formed on both sides of the portion 11. Further, fitting portions 12 and 13 of seals 15 and 16 to be described later are formed at both ends of the double row outer rolling surfaces 2a and 2a.

  Between both rolling surfaces of the inner member 1 and the outer member 2, double rows of balls 3 and 3 are accommodated and held by the cages 14 and 14 so as to be freely rollable. Seals 15 and 16 are attached to the opening portions at both ends of the annular space formed between the inner member 1 and the outer member 2, and leakage of grease sealed inside the bearing to the outside and from the outside Rain water and dust are prevented from entering the bearing.

  The outer-side seal 15 is an integral type composed of a core metal 17 that is press-fitted into the inner periphery of the outer-side end portion of the outer member 2 and a seal member 18 that is integrally joined to the core metal 17 by vulcanization adhesion. It is composed of a seal. The metal core 17 is formed by press working an austenitic stainless steel plate (JIS standard SUS304 type or the like) or a cold rolled steel plate (JIS standard SPCC type or the like).

  On the other hand, the seal member 18 is made of synthetic rubber such as NBR (acrylonitrile-butadiene rubber), and is formed to be inclined to the side lip 18a and the dust lip 18b formed to be inclined outward in the radial direction, and to the inner side of the bearing. The grease lip 18c is integrally provided. The base portion 6c on the inner side of the wheel mounting flange 6 is formed in a curved surface having an arc-shaped cross section, and the side lip 18a and the dust lip 18b are slidably contacted with the base portion 6c with a predetermined squeezing force, and the grease lip 18c is predetermined. The labyrinth seal is configured so as to confront each other through the radial clearance.

  On the other hand, the inner seal 16 is a so-called pack seal composed of an annular seal plate 19 and a slinger 20 which are arranged to face each other. The seal plate 19 includes a cored bar 21 that is press-fitted into the inner periphery of the end of the outer member 2 and a seal member 22 that is integrally joined to the cored bar 21 by vulcanization adhesion. The core metal 21 is formed by pressing from a steel plate having rust prevention ability, such as an austenitic stainless steel plate (JIS standard SUS304, etc.) or a rust-proof cold rolled steel plate (JIS standard SPCC, etc.). The cross section is substantially L-shaped.

  The seal member 22 is made of a synthetic rubber such as NBR, and includes a side lip 22a extending obliquely outward in the radial direction, a grease lip 22b and a dust lip 22c formed in a bifurcated shape.

  On the other hand, the slinger 20 is a ferritic stainless steel plate (JIS standard SUS430 or the like), an austenitic stainless steel plate (JIS standard SUS304 type or the like), or a rust-proof cold rolled steel plate (JIS standard). A cylindrical portion 20a that is formed into a substantially L-shaped cross section by pressing from a steel plate having anticorrosive ability, such as a SPCC system, etc., and is press-fitted into the shoulder 7 of the inner ring 5, and radially outward from the cylindrical portion 20a. And an upright plate portion 20b. The side lip 22a of the seal member 22 is slidably contacted with the upright plate portion 20b via a predetermined axial nip, and the grease lip 22b and the dust lip 22c are slid onto the cylindrical portion 20a via a predetermined radial nip. It is touched. Further, the standing plate portion 20b of the slinger 20 is opposed to the seal plate 19 through a slight radial clearance to form a labyrinth seal.

  The hub ring 4 is formed by pressing or cold rolling (hereinafter referred to as plastic working) a plate material or pipe material made of carburized steel such as SCr420 or SCM415 having a relatively small amount of carbon. Specifically, it is formed from a pipe material by pressing and cold rolling. Further, both end faces where burrs are generated by plastic working are turned after the machining, or are ground if necessary. And the surface hardness is hardened in the range of 50 to 64 HRC by carburizing and quenching. Note that the caulking portion 4d is kept raw in raw material hardness by carburization prevention. Further, the inner rolling surface 4a is formed with a predetermined size and accuracy by grinding. Thereafter, superfinishing is performed as necessary. Thereby, it has sufficient mechanical strength with respect to the rotational bending load applied to the wheel mounting flange 6, the fretting resistance of the small diameter step portion 4c is improved, and the durability of the hub wheel 4 is further improved. Further, there is no occurrence of minute cracks and the like, and the plastic working of the crimped portion 4d can be performed smoothly.

  In addition to this, examples of the material of the hub wheel 4 include carburized steel such as SCM440, cold rolled steel (such as JIS standard SPCC), and carbon steel such as S45C. In the case of cold rolled steel or carbon steel, the surface hardness is set to 50 to 50 by induction hardening from the inner rolling surface 4a to the small diameter step 4c from the base 6c which becomes the seal land portion of the seal 15 on the outer side. A hardening process is performed in the range of 64 HRC.

  The outer member 2 is formed by plastic working from a plate material and pipe material made of carburized steel such as SCr420 and SCM415. Specifically, it is formed from a pipe material by pressing and cold rolling. And the surface hardness is hardened in the range of 50 to 64 HRC by carburizing and quenching. Other examples of the material of the outer member 2 include carburized steel such as SCM440, or cold rolled steel or carbon steel such as S45C. In the case of cold-rolled steel or carbon steel, at least the double row outer raceway surfaces 2a and 2a of the outer member 2 are hardened by induction hardening in a range of 50 to 64 HRC. The double row outer rolling surfaces 2a, 2a are formed with predetermined dimensions and accuracy by grinding. After that, superfinishing is performed as necessary.

  The inner ring 5 is formed by plastic working from a pipe material made of bearing steel such as SUJ2 or carburized steel such as SCr420 or SCM415. And the surface hardness is hardened in the range of 50 to 64 HRC by submerged quenching or carburizing quenching. Further, the inner rolling surface 5a is formed with a predetermined size and accuracy by grinding. After that, superfinishing is performed as necessary. In addition to this, examples of the material of the inner ring 5 include carburized steel such as SCM440, or cold rolled steel or carbon steel such as S45C. In the case of a cold rolled steel plate or carbon steel, at least the inner rolling surface 5a is subjected to a hardening process in a range of 50 to 64 HRC by induction hardening.

  As described above, in the present embodiment, the hub wheel 4, the inner ring 5, and the outer member 2 are formed by plastic working from a plate material or a pipe material, so that the strength and durability of the bearing can be improved with light weight and compactness. The illustrated wheel bearing device can be provided.

  Here, the wheel mounting flange 6 of the hub wheel 4 is composed of a flange main body 23 projecting in a petal shape at the outer end of the hub wheel 4 and a reinforcing plate 24 joined to the flange main body 23. ing. The reinforcing plate 24 is formed by press working from carburized steel such as SCM440, cold rolled steel plate (JIS standard SPCC system, etc.) or carbon steel such as S45C. Steel plates with a wall thickness of about 75% are used. Accordingly, the strength and rigidity of the wheel mounting flange 6 can be increased while reducing the weight of the hub wheel 4, and durability can be ensured even when a large moment load is applied to the wheel mounting flange 6.

  The reinforcing plate 24 includes a flange portion 24a that contacts the outer side surface 23a of the flange body 23, and a cylindrical pilot portion 24b that extends in the axial direction from the flange portion 24a and guides a wheel and a brake rotor (not shown). It has. In addition, an in-row part 25 projects from the outer diameter part of the flange part 24a, and is fitted on the outer diameter of the flange body 23 via a predetermined fitting clearance. The centering accuracy between the hub wheel 4 and the reinforcing plate 24 can be increased by the inrow portion 25.

Next, the processing steps of the wheel mounting flange 6 will be described in detail with reference to FIG.
(A) is a drilling step, and the hub wheel 4 is placed on the base (die) 26 so that the reinforcing plate 24 is positioned below in a state where the flange main body 23 and the reinforcing plate 24 are joined. Then, the bolt insertion holes 27 are bored from the inner side (flange main body 23 side) by punching processing at equal intervals in the circumferential direction. This punching process is performed by a punching tool (punch) 28 in which perforated pins 28a are provided so as to be equidistant in the circumferential direction. Here, although punching may be performed from the outer side (reinforcing plate 24 side), the exit side of the perforated pin 28a has a broken surface, and burrs are generated by punching, resulting in a raised portion on the seating surface of the hub bolt 6a. It is not preferable. As in this embodiment, the punching process is performed by punching from the inner side (flange body 23 side), so that the fracture surface at the entrance of the perforated pin 28a becomes a sheared surface, thereby preventing the occurrence of harmful burrs and the like. can do.

  Then, in the surface pressing step shown in (b), the hub wheel 4 is placed on the base 26 so that the reinforcing plate 24 is positioned above, and the surface pressing pins 29a are projected in the circumferential direction. Surface pressing is performed from the outer side (reinforcement plate 24 side) by the surface pressing tool 29. The surface pressing pin 29 a is set to have a slightly smaller diameter than the bolt insertion hole 27, and a tapered surface set in a range of 30 to 60 ° is formed on the base 30, and the surface pressing pin 29 a is inserted into the bolt insertion hole 27. By doing so, a predetermined chamfered portion 27a is formed by pressing at the edge of the bolt insertion hole 27 on the reinforcing plate 24 side. Thereby, work efficiency can improve and cost reduction can be achieved. In addition, the hub wheel 4 is reversed, and similarly, a predetermined chamfered portion 27a is formed by pressing at the edge of the bolt insertion hole 27 on the flange body 23 side.

  As described above, in this embodiment, the wheel mounting flange 6 of the hub wheel 4 includes the flange main body 23 and the reinforcing plate 24 joined thereto, and the flange main body 23 of the hub wheel 4 and the flange of the reinforcing plate 24. Since the punching process and the surface pressing process of the bolt insertion hole 27 are performed in a state where the portions 24a are integrally overlapped, the press-fitting width of the hub bolt 6a can be secured, and the hub bolt 6a is loosened over a long period of time. Can be prevented and the fixing force can be increased, and even if the wheel mounting flange 6 is a separate body of the flange main body 23 and the reinforcing plate 24, the dimensions and position accuracy of the bolt insertion holes 27 are improved. Therefore, the press-fitting work of the hub bolt 6a is performed efficiently, and the hub bolt 6a is not tilted and fixed.

  In the present embodiment, as shown in FIG. 1, the vehicle body mounting flange 10 of the outer member 2 is joined to a flange main body 31 projecting in a petal shape at an end on the inner side, and the flange main body 31. And a reinforcing plate 32. The reinforcing plate 32 is formed by press working from carburized steel such as SCM440, cold rolled steel plate (JIS standard SPCC system, etc.) or carbon steel such as S45C. Steel plates with a wall thickness of about 75% are used. Accordingly, the strength and rigidity of the vehicle body mounting flange 10 can be increased while reducing the weight of the outer member 2, and durability can be ensured even when a large moment load is applied to the vehicle body mounting flange 10. .

  The reinforcing plate 32 includes a flange portion 32a that contacts the side surface 31a on the inner side of the flange body 31, a cylindrical pilot portion 32b that extends in the axial direction from the flange portion 32a, and is fitted to a knuckle (not shown). It has. In addition, an in-row portion 33 projects from the outer diameter portion of the flange portion 32a, and is externally fitted to the outer diameter of the flange main body 31 through a predetermined fitting clearance. The centering accuracy between the outer member 2 and the reinforcing plate 32 can be increased by the inrow portion 33.

  Here, punching and surface pressing of the bolt lower hole are performed in a state where the flange main body 31 of the outer member 2 and the flange portion 32a of the reinforcing plate 32 are integrally overlapped. Accordingly, it is possible to secure a press-fitting width of a fixing bolt (not shown), to prevent the fixing bolt from loosening over a long period of time, and to increase the fixing force. Even if it is the separate body of 31 and the reinforcement board 32, the dimension and position accuracy of a bolt pilot hole will improve.

  Fig.4 (a) is a front view which shows 2nd Embodiment of the wheel bearing apparatus which concerns on this invention, (b) is principal part sectional drawing of (a). Note that this embodiment is basically different from the above-described embodiment (FIG. 1) only in part of the configuration of the reinforcing plate, and the same reference numerals are used for the same parts or parts having the same functions. Detailed description will be omitted.

  The wheel mounting flange 35 of the hub wheel 34 includes a flange main body 23 projecting in a petal shape at the outer end of the hub wheel 34 and a reinforcing plate 36 joined to the flange main body 23. The reinforcing plate 36 is formed by press working from carburized steel such as SCM440, cold rolled steel plate (JIS standard SPCC system, etc.) or carbon steel such as S45C. Steel plates with a wall thickness of about 75% are used.

  The reinforcing plate 36 includes a flange portion 36a that contacts the outer side surface 23a of the flange main body 23, and a cylindrical pilot portion 24b that extends in an axial direction from the flange portion 36a. In addition, an in-row portion 25 is projected from the outer diameter portion of the flange portion 36a and is externally fitted to the outer diameter of the flange body 23 through a predetermined fitting clearance.

  As in the above-described embodiment, the bolt insertion holes 27 are bored from the inner side (flange body 23 side) by punching in the circumferential direction, and surface pressing is performed by a surface pressing tool. A predetermined chamfered portion 27 a is formed at the edge of the hole 27 by press working.

  In addition, after the surface pressing process, an annular groove 38 having a predetermined width including the bolt insertion hole 27 is formed on the outer side surface 37 of the reinforcing plate 36 with which the brake rotor (not shown) abuts by cutting. Is formed. By forming the annular groove 38 in the side surface 37, it is possible to minimize the influence of deformation or the like on the side surface 37 due to press-fitting of a hub bolt (not shown). Furthermore, if the side surface 37 is subjected to secondary cutting after press-fitting of the hub bolt, it is possible to suppress as much as possible the runout of the side surface 37 caused by press-fitting the hub bolt.

  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 including an inner member including a hub ring integrally having a wheel mounting flange and an inner ring press-fitted into the hub ring.

DESCRIPTION OF SYMBOLS 1 Inner member 2 Outer member 2a Outer rolling surface 3 Ball | bowl 4, 34 Hub wheel 4a, 5a Inner rolling surface 4b, 7 Shoulder part 4c Small diameter step part 4d Clamping part 5 Inner ring 6, 35 Wheel mounting flange 6a Hub bolt 6b Circular holes 6c, 30 Base 8 Large end portion 9 of inner ring Small end portion 10 of inner ring Car body mounting flange 11 Annular convex portions 12, 13 Fitting portion 14 Cage 15 Outer side seal 16 Inner side seal 17, 21 core Gold 18, 22 Seal member 18a, 22a Side lip 18b, 22c Dustrip 18c, 22b Grease lip 19 Seal plate 20 Slinger 20a Cylindrical portion 20b Standing plate portion 23, 31 Flange body 23a Side surface 24, 32 on the outer side of the flange body 36 Reinforcing plates 24a, 32a, 36a Flange portions 24b, 32b Pilot portions 25, 33 Inrow portions 26 Base 27 Bo G Insert hole 27a Chamfer 28 Punching tool 28a Drilling pin 29 Surface pressing tool 29a Surface pressing pin 31a Flange body inner side 37 Flange outer side 38 Flange 50 Wheel bearing device 51 Hub wheel 51a, 58a Inner rolling surface 52 Double row angular contact ball bearing 53 Shaft portion 53a Small diameter step portion 54, 61 Cut and raised pieces 55, 62 Tongue piece 55a Swelling portion 56 Hub bolt 57 Outer member 57a Outer rolling surface 58 Inner ring 59 Cage 60 balls

Claims (10)

An outer member in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery;
A wheel mounting flange for mounting the wheel on the outer end is integrated, and an arcuate inner rolling surface facing one of the double row rolling surfaces on the outer periphery, and an axis extending from the inner rolling surface. A hub wheel formed with a cylindrical small-diameter step portion extending in the direction, and a circle that is press-fitted into the small-diameter step portion of the hub wheel through a predetermined shimoshiro and that opposes the other of the double-row outer rolling surfaces on the outer periphery An inner member composed of an inner ring formed with an arc-shaped inner rolling surface;
A double row of balls accommodated between the rolling surfaces of the inner member and the outer member via a retainer between the rolling surfaces;
A seal mounted at both ends of an annular space formed between the outer member and the inner member;
In the wheel bearing device in which the inner ring is fixed in the axial direction with respect to the hub wheel by a crimping portion formed by plastically deforming an end portion of the small-diameter stepped portion radially outwardly,
A flange main body in which the hub ring, the inner ring, and the outer member are formed by plastic working from a plate material or a pipe material, and the wheel mounting flange is protruded in a petal shape at the outer end of the hub wheel, and the flange A reinforcing plate joined to the main body, the reinforcing plate is formed from a plate material by plastic working, a flange portion that contacts the side surface on the outer side of the flange main body, and extends in the axial direction from the flange portion, the wheel And a cylindrical pilot portion that guides the brake rotor, and an inlay portion that protrudes from the outer diameter portion of the flange portion, and is fitted on the outer diameter of the flange body via a predetermined fitting clearance. A wheel bearing device characterized by that.   The wheel according to claim 1, wherein bolt insertion holes are formed by punching at equal intervals in the circumferential direction of the wheel mounting flange, and a predetermined chamfered portion is formed by pressing at an edge of the bolt insertion hole. Bearing device.   The wheel bearing device according to claim 1 or 2, wherein a thickness of the reinforcing plate is set to about 70 to 75% of a thickness of the flange main body.   The wheel bearing device according to any one of claims 1 to 3, wherein an annular groove having a predetermined width including the bolt insertion hole is formed on a side surface on the outer side of the reinforcing plate by cutting.   The wheel bearing device according to any one of claims 1 to 4, wherein after the hub bolt is press-fitted into the bolt insertion hole, the outer side surface of the reinforcing plate is secondarily cut.   A flange body that integrally has a vehicle body mounting flange to be attached to a knuckle on the outer periphery of the outer member, and the vehicle body mounting flange protrudes in a petal shape at an end on the inner side of the outer member; A reinforcing plate joined to the flange main body, the reinforcing plate is formed from a plate material by plastic working, and a flange portion that contacts the side surface on the inner side of the flange main body, and extends axially from the flange portion, And a cylindrical pilot portion that is fitted to the knuckle, and an in-row portion projects from the outer diameter portion of the flange portion, and is fitted to the outer diameter of the flange body via a predetermined fitting clearance. The wheel bearing device according to claim 1.   The wheel bearing device according to claim 6, wherein a thickness of the reinforcing plate is set to about 70 to 75% of a thickness of the flange main body. An outer member in which a double-row arc-shaped outer rolling surface is integrally formed on the inner periphery;
A wheel mounting flange for mounting the wheel on the outer end is integrated, and an arcuate inner rolling surface facing one of the double row rolling surfaces on the outer periphery, and an axis extending from the inner rolling surface. A hub wheel formed with a cylindrical small-diameter step portion extending in the direction, and a circle that is press-fitted into the small-diameter step portion of the hub wheel through a predetermined shimoshiro and that opposes the other of the double-row outer rolling surfaces on the outer periphery An inner member composed of an inner ring formed with an arc-shaped inner rolling surface;
A double row of balls accommodated between the rolling surfaces of the inner member and the outer member via a retainer between the rolling surfaces;
A seal mounted at both ends of an annular space formed between the outer member and the inner member;
In the method of manufacturing a wheel bearing device in which the inner ring is fixed in the axial direction with respect to the hub wheel by a crimping portion formed by plastically deforming an end portion of the small-diameter stepped portion radially outward.
A flange main body in which the hub ring, the inner ring, and the outer member are formed by plastic working from a plate material or a pipe material, and the wheel mounting flange is protruded in a petal shape at the outer end of the hub wheel, and the flange A reinforcing plate joined to the main body, the reinforcing plate is formed from a plate material by plastic working, a flange portion that contacts the side surface on the outer side of the flange main body, and extends in the axial direction from the flange portion, the wheel And a cylindrical pilot portion that guides the brake rotor, and an inrow portion that protrudes from the outer diameter portion of the flange portion, and is externally fitted to the outer diameter of the flange body through a predetermined fitting clearance, In a state where the flange main body and the reinforcing plate are joined, a bolt insertion hole is formed by punching in a circumferentially uniform distribution. Method.   The method for manufacturing a wheel bearing device according to claim 8, wherein the bolt insertion hole is formed by punching from the flange body side.   A flange body that integrally has a vehicle body mounting flange to be attached to a knuckle on the outer periphery of the outer member, and the vehicle body mounting flange protrudes in a petal shape at an end on the inner side of the outer member; A reinforcing plate joined to the flange main body, the reinforcing plate is formed from a plate material by plastic working, and a flange portion that contacts the side surface on the inner side of the flange main body, and extends axially from the flange portion, And a cylindrical pilot portion that is fitted to the knuckle, and an in-row portion projects from the outer diameter portion of the flange portion, and is fitted to the outer diameter of the flange body via a predetermined fitting clearance. The method for manufacturing a wheel bearing device according to claim 8, wherein punching of the bolt lower hole is performed in a state where the flange main body and the flange portion of the reinforcing plate are integrally overlapped.

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