WO2012043706A1 - Unité de support de roue motrice et son procédé de fabrication - Google Patents

Unité de support de roue motrice et son procédé de fabrication Download PDF

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Publication number
WO2012043706A1
WO2012043706A1 PCT/JP2011/072345 JP2011072345W WO2012043706A1 WO 2012043706 A1 WO2012043706 A1 WO 2012043706A1 JP 2011072345 W JP2011072345 W JP 2011072345W WO 2012043706 A1 WO2012043706 A1 WO 2012043706A1
Authority
WO
WIPO (PCT)
Prior art keywords
wheel
mounting flange
bearing device
hub
wheel bearing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2011/072345
Other languages
English (en)
Japanese (ja)
Inventor
梅木田　光
清武 柴田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTN Corp
Original Assignee
NTN Corp
NTN Toyo Bearing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2010220756A external-priority patent/JP2012076481A/ja
Priority claimed from JP2010220755A external-priority patent/JP2012076480A/ja
Application filed by NTN Corp, NTN Toyo Bearing Co Ltd filed Critical NTN Corp
Publication of WO2012043706A1 publication Critical patent/WO2012043706A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0094—Hubs one or more of the bearing races are formed by the hub
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/28—Making machine elements wheels; discs
    • B21K1/40—Making machine elements wheels; discs hubs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0005—Hubs with ball bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0078—Hubs characterised by the fixation of bearings
    • B60B27/0084—Hubs characterised by the fixation of bearings caulking to fix inner race
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/186—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2380/00—Bearings
    • B60B2380/10—Type
    • B60B2380/12—Ball bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2380/00—Bearings
    • B60B2380/70—Arrangements
    • B60B2380/75—Twin or multiple bearings having identical diameters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2380/00—Bearings
    • B60B2380/70—Arrangements
    • B60B2380/77—Diameters of bearings at opposite ends of hub
    • B60B2380/772—Identical diameters of bearings at opposite ends of hub
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2380/00—Bearings
    • B60B2380/80—Shafts specially adapted to receive bearings
    • B60B2380/82—Caulked to fix race
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2900/00—Purpose of invention
    • B60B2900/10—Reduction of
    • B60B2900/111—Weight
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2220/00—Shaping
    • F16C2220/40—Shaping by deformation without removing material
    • F16C2220/46—Shaping by deformation without removing material by forging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

Definitions

  • the present invention relates to a wheel bearing device that rotatably supports a wheel of an automobile or the like.
  • the present invention relates to a reduction in cost by reducing a cutting allowance and an increase in the strength of a high load portion, thereby reducing the weight and increasing the weight.
  • the present invention relates to a wheel bearing device that solves the conflicting problem of increasing rigidity and extends the life of the bearing, and a method of manufacturing the same.
  • 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.
  • Second generation structure with body mounting flange or wheel mounting flange formed directly on the outer periphery
  • third generation structure with one inner rolling surface formed directly on the outer periphery of the hub wheel, or constant velocity 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 joint.
  • the wheel bearing device 50 is called a third generation on the driven wheel side, and includes an inner member 51, an outer member 52, and double-row balls 53, 53.
  • the inner member 51 includes a hub ring 55 including a solid shaft portion 54 and an inner ring 56 fitted to the hub ring 55.
  • the hub wheel 55 integrally has a wheel mounting flange 57 for mounting a wheel (not shown) at one end thereof, an inner rolling surface 55a on the outer periphery, and a small diameter extending in the axial direction from the inner rolling surface 55a.
  • a step portion 55b is formed.
  • hub bolts 57 a for fixing the wheels are planted at equal circumferential positions of the wheel mounting flanges 57.
  • a positioning cylinder portion 58 for positioning the wheel is provided concentrically with the shaft portion 54.
  • An inner ring 56 having an inner rolling surface 56a formed on the outer periphery is press-fitted into the small diameter step portion 55b of the hub wheel 55.
  • the inner ring 56 is prevented from coming off in the axial direction with respect to the hub wheel 55 by a crimped portion 55c formed by plastically deforming the end portion of the small diameter step portion 55b of the hub wheel 55 radially outward. .
  • the outer member 52 includes a hollow shaft portion 59, and integrally includes a vehicle body attachment flange 52b for attachment to a suspension device (not shown) on the outer periphery, and double row outer rolling on the inner periphery. Surfaces 52a and 52a are formed. Between the inner rolling surfaces 55a and 56a facing the double-row outer rolling surfaces 52a and 52a, double-row balls 53 and 53 are accommodated via a cage 61 so as to roll freely. Further, a positioning cylinder portion 60 for positioning the vehicle body is formed concentrically with the shaft portion 59 on the opposite side of the shaft portion 59 with the vehicle body mounting flange 52b interposed therebetween.
  • a wheel mounting flange 57 extending radially in a direction orthogonal to the shaft portion 54 is formed integrally with the shaft portion 54 by cold side extrusion, and is also extruded during molding.
  • the positioning cylinder portion 58 constituted by the remaining portion is also formed integrally with the shaft portion 54.
  • a vehicle body mounting flange 52b extending radially in a direction orthogonal to the shaft portion 59 is formed integrally with the shaft portion 59 by cold side extrusion, and is also extruded during molding.
  • the positioning cylinder part 60 constituted by the remaining part is also formed integrally with the shaft part 59.
  • the wheel mounting flange 57 and the vehicle body mounting flange 52b are compression-molded, it can be molded with a relatively small equipment using cold forging, and the machining cost in the subsequent process is reduced.
  • the hub wheel 55 and the outer member 52 that are reduced and inexpensive can be obtained.
  • cylindrical positioning cylinders 58, 60 that are continuous in the circumferential direction can be easily cold formed integrally with the shafts 54, 59 with high accuracy, so that the thickness of the necessary part is secured.
  • the material yield can be improved and the manufacturing cost can be reduced (see, for example, Patent Document 1).
  • the bonde process refers to a process of applying a phosphate film (lubricant film) in order to eliminate the frictional resistance between the molded product and the mold during the cold forging process.
  • the present invention has been made in view of the above circumstances, and reduces the cutting cost to reduce the cost, while increasing the strength of the high-load portion, solving the conflicting problem of weight reduction and high rigidity.
  • the invention according to claim 1 of the present invention includes an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, and a wheel for attaching a wheel to one end.
  • a hub ring that integrally has a mounting flange and a cylindrical pilot portion that extends outward from the wheel mounting flange, and that has a small-diameter step portion extending in the axial direction on the outer periphery, and a small-diameter step portion of the hub ring.
  • An inner member comprising at least one combined inner ring and having an outer circumferential surface formed with a double row inner rolling surface facing the double row outer rolling surface, and held between the inner member and the outer member
  • a wheel bearing device comprising a double row rolling element housed so as to be freely rollable via a vessel, the hub wheel is formed by hot forging and cold forging, and the cold forging is partially It has been subjected.
  • the hub wheel is formed by hot forging and cold forging, and cold forging is partially applied, so work hardening by cold forging increases the strength of high load parts and light weight
  • the wheel mounting flange is composed of a plurality of partial flanges divided into a plurality of circumferential directions as in the invention described in claim 2, when the outer member is fastened to the knuckle, this wheel
  • the knuckle bolt can be easily fastened with a tool without being obstructed by the mounting flange, and the assembling work can be simplified.
  • the pilot portion is provided with notches at a plurality of locations in the circumferential direction, and is formed in the shape of intermittent protrusions.
  • the pilot portion is interposed between the partial flanges. If formed, weight reduction can be achieved without reducing the rigidity of the hub wheel.
  • the wheel mounting flange can be effectively applied even if a large moment load is applied to the wheel mounting flange. It is possible to increase the strength and improve the durability.
  • the cold forging may be performed on the pilot portion.
  • a recess extending in a mortar shape from the outer end surface of the hub wheel toward the inner side is formed, and a through-hole that opens from the recess to the inner end surface Is formed by punching, and the recess is tapered from the inner diameter portion of the pilot portion by the cold forging, and the outer end of the hub wheel is substantially the same as the thickness of the wheel mounting flange. If they are formed to have the same uniform thickness, the conflicting problems of weight reduction and high rigidity can be solved simultaneously.
  • the outer member is formed of medium-high carbon steel containing 0.40 to 0.80 wt% of carbon and is attached to the vehicle body on the outer periphery via a fixing bolt. If the mounting flange is integrated and the cold forging is applied to the base of the wheel mounting flange, the strength of the wheel mounting flange is effectively increased even if a large moment load is applied to the wheel mounting flange. Durability can be improved.
  • the hub wheel may be formed of medium to high carbon steel containing carbon of 0.40 to 0.80 wt%.
  • the method invention according to claim 9 of the present invention includes an outer member in which a double row outer rolling surface is integrally formed on the inner periphery, a wheel mounting flange for mounting a wheel on one end, A hub ring integrally having a cylindrical pilot portion extending from the wheel mounting flange to the outer side and having a small diameter step portion extending in the axial direction on the outer periphery, and at least fitted to the small diameter step portion of the hub ring
  • An inner member comprising a single inner ring and having a double row inner rolling surface facing the outer row rolling surface of the double row on the outer periphery, and a cage between the inner member and the outer member
  • the hub wheel is subjected to a hot forging step and a cold partly applied after the hot forging step.
  • An intermediate forging step at least a root portion of the wheel mounting flange is It is thinned by between forging.
  • the hub wheel includes a hot forging step and a cold forging step that is partially performed after the hot forging step, and at least a root portion of the wheel mounting flange is thinned by cold forging. Therefore, even if a large moment load is applied to the wheel mounting flange by work hardening by cold forging, the strength of the wheel mounting flange can be effectively increased and the durability can be improved.
  • the cutting allowance can be reduced by partial cold forging, the processing force can be reduced, and the forging equipment can be made compact.
  • the said wheel mounting flange is comprised by the some partial flange divided
  • the part is formed in a shape narrower than the tip part, and the root part is formed in a smooth arc shape gradually spreading from the tip part in a state where the tip part is constrained by a die by the cold forging.
  • the plastic flow of the material can be made smooth, the wheel mounting flange can be made thin, and the base part on the inner side of the wheel mounting flange, the inner rolling surface, etc. Can be formed with high accuracy.
  • a recess extending in a mortar shape from the outer end surface of the hub wheel toward the inner side is formed by hot forging, and this recess is an inner diameter of the pilot portion. If it is formed into a convex arc shape from the surface and the recess is tapered and thinned by cold forging, the strength and rigidity of the hub wheel will be increased by work hardening by cold forging. Thus, the hollowing can be realized and the weight can be reduced.
  • the pilot portion is provided with notches at a plurality of locations in the circumferential direction, and is formed by hot forging into an intermittent projecting piece, the pilot portion being While arrange
  • the root portion of the wheel mounting flange is thinned by at least 10% by the cold forging, the strength and rigidity are increased by work hardening of the cold forging. It is possible to reduce the weight of the strengthened portion by reducing the thickness.
  • a base portion is formed in a shape narrower than a tip portion by the hot forging of the side surface in the circumferential direction of the partial flange, and the cold forging If the base is formed in a smooth arc shape that gradually spreads from the tip while the tip is constrained by a mold, the plastic flow of the material can be made smooth, and the wheel mounting flange can be made thin. In addition, it is possible to accurately form the pilot portion, the inner base portion of the wheel mounting flange, the inner rolling surface and the like by the remaining extruded portion at the time of molding.
  • the hub wheel has a hardness increase after cold forging set to 5% or more with respect to the surface hardness after hot forging, the load is high.
  • the strength of the portion can be increased, and the conflicting problems of weight reduction and high rigidity can be solved.
  • the hub bolt insertion hole of the wheel mounting flange is punched by the hot forging, and then formed into a predetermined inner diameter by the cold forging. If the hardness increase after cold forging is set to be less than 5% of the surface hardness of the inner peripheral surface after hot forging of the hub bolt insertion hole, the difference in hardness between the hub bolt and the hub bolt insertion hole Can be set to 10 HRC or more, the inner peripheral surface of the hub bolt insertion hole is plastically deformed, and the hub bolt knurl sufficiently bites into the hub bolt insertion hole, increasing the slip torque of the hub bolt without hindering assembly workability and Can be stabilized.
  • a wheel bearing device includes an outer member in which a double row outer rolling surface is integrally formed on an inner periphery, a wheel mounting flange for mounting a wheel at one end, and an outer portion from the wheel mounting flange.
  • a hub ring integrally formed with a cylindrical pilot portion extending to the side and having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring fitted to the small-diameter step portion of the hub ring,
  • An inner member having a double row inner rolling surface facing the outer row rolling surface of the double row is formed on the outer periphery, and the inner member and the outer member are rotatably accommodated via a cage between the inner member and the outer member.
  • the hub wheel is formed by hot forging and cold forging, and the cold forging is partially applied.
  • Work hardening increases the strength of heavy loads, making it lighter and more rigid
  • the method for manufacturing a wheel bearing device includes an outer member in which a double row outer rolling surface is integrally formed on an inner periphery, a wheel mounting flange for mounting a wheel at one end, and the wheel mounting.
  • a hub ring integrally having a cylindrical pilot portion extending from the flange to the outer side and having a small-diameter step portion extending in the axial direction on the outer periphery, and at least one inner ring fitted to the small-diameter step portion of the hub ring
  • An inner member having a double-row inner rolling surface facing the outer row of the double row on the outer periphery, and the inner member and the outer member can be freely rolled via a cage.
  • the hub wheel is subjected to a hot forging step, and a cold forging step that is partially performed after the hot forging step.
  • At least the base of the wheel mounting flange is cold-forged. Because it is thinned by, in work hardening by cold forging, even large moment load is loaded on the wheel mounting flange, effectively increasing the strength of the wheel mounting flange, it is possible to improve the durability.
  • cutting costs can be reduced by partial cold forging, the cost can be reduced, the processing force can be kept small, and the forging equipment can be made compact.
  • FIG. 1 It is a longitudinal section showing one embodiment of a wheel bearing device concerning the present invention. It is a front view of FIG. It is a block diagram which shows the manufacturing process of the wheel bearing apparatus which concerns on this invention.
  • A) is a front view showing the hub wheel of FIG. 1 after hot forging, and (b) is a longitudinal sectional view taken along line IV-IV of (a).
  • A) is a front view showing the hub wheel of FIG. 1 after cold forging, and (b) is a longitudinal sectional view taken along line VV of (a). It is explanatory drawing which shows the cold forging method of the hub wheel of FIG.
  • (A) is a plan view showing a state in which a molded product is set on a cold forging die
  • (b) is a cross-sectional view taken along line VII-VII in (a). It is a longitudinal cross-sectional view which shows the conventional wheel bearing apparatus.
  • a hub ring formed with a small-diameter step that extends to the inner ring, and an inner ring that is fitted to the small-diameter step of the hub ring and that has an inner rolling surface facing the other of the outer rolling surfaces of the double row on the outer periphery.
  • the wheel bearing device comprising: an inner member, and a double row rolling element that is rotatably accommodated between the inner member and the outer member via a cage.
  • the pilot portion is formed in the shape of a projecting piece that extends from the wheel mounting flange to the outer side and is provided with notches at a plurality of locations in the circumferential direction, and the pilot portion is disposed between the partial flanges.
  • the hub wheel is formed by two forging processes including hot forging and subsequent cold forging, and the cold forging is applied to at least a root portion of the wheel mounting flange.
  • FIG. 1 is a longitudinal sectional view showing an embodiment of a wheel bearing device according to the present invention
  • FIG. 2 is a front view of FIG. 1
  • FIG. 3 is a block diagram showing a manufacturing process of the wheel bearing device according to the present invention.
  • 4A is a front view showing the hub wheel of FIG. 1 after hot forging
  • FIG. 4B is a longitudinal sectional view taken along line IV-IV in FIG. 5A
  • FIG. 1 is a front view showing the hub wheel after cold forging
  • FIG. 1B is a longitudinal sectional view taken along line VV of FIG. 1A
  • FIG. 6 is a cold forging method of the hub wheel of FIG.
  • FIG. 1 is a longitudinal sectional view showing an embodiment of a wheel bearing device according to the present invention
  • FIG. 2 is a front view of FIG. 1
  • FIG. 3 is a block diagram showing a manufacturing process of the wheel bearing device according to the present invention.
  • 4A is a front view showing the hub wheel of FIG. 1 after hot
  • FIG. 7A is a plan view showing a state where a molded product is set on a cold forging die
  • FIG. 7B is a sectional view taken along line VII-VII in FIG. .
  • 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)
  • the side closer to the center is referred to as the inner side (right side in FIG. 1).
  • This wheel bearing device is for a driven wheel called a third generation, and includes an inner member 1 and an outer member 2, and a double row rolling element housed between the inner member 1 and the outer member 2. (Balls) 3 and 3.
  • the inner member 1 indicates a hub ring 4 and an inner ring 5 press-fitted into the hub ring 4.
  • the hub wheel 4 integrally has a wheel mounting flange 6 divided into a plurality of circumferential directions (here, five) at the outer end of the outer periphery (see FIG. 2), and a wheel (not shown) is provided on the outer periphery.
  • the hub bolt 7 for fastening is attached.
  • the wheel mounting flange 6 is formed so as to protrude radially from the annular base portion with a width substantially the same as the portion where each bolt insertion hole 8 is formed by cutting out a portion excluding the vicinity of the hub bolt insertion hole 8. That is, the wheel mounting flange 6 is formed by being divided into a plurality of partial flanges 6a separated in the circumferential direction.
  • a cylindrical brake pilot portion 10 extending outward is formed on the base portion 9 of the wheel mounting flange 6 of the hub wheel 4 to guide the inner diameter surface of the brake rotor 11. Further, a wheel pilot portion 12 extending from the brake pilot portion 10 to the outer side is formed. The wheel pilot portion 12 guides the inner diameter surface of the wheel hub 13 mounted on the brake rotor 11 so as to be smaller in diameter than the brake pilot portion 10. And the notch is provided in the multiple places of the circumferential direction, and it forms in the shape of the intermittent protrusion.
  • the intermittent wheel pilot portion 12 is formed between a plurality of partial flanges 6a (see FIG. 2). Thereby, weight reduction can be achieved without reducing the rigidity of the hub wheel 4.
  • An inner rolling surface 4a and a small-diameter step portion 4b extending in the axial direction from the inner rolling surface 4a are formed on the outer periphery of the hub wheel 4 from the wheel mounting flange 6 to the inner side. Then, the inner ring 5 having the inner raceway surface 5a formed on the outer periphery is press-fitted into the small diameter step portion 4b, and the crimping portion 4c formed by plastically deforming the end portion of the small diameter step portion 4b radially outwardly, The inner ring 5 is prevented from coming off in the axial direction with respect to the hub ring 4.
  • the hub wheel 4 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and includes a base 9 on which an outer side inner rolling surface 4a and an outer side seal 19 described later are mounted.
  • the surface hardness is set to a range of 58 to 64 HRC by induction hardening over the small diameter step 4b.
  • the caulking portion 4c is an unquenched portion having a surface hardness of 30 HRC or less after forging.
  • the inner ring 5 and the rolling element 3 are made of high carbon chrome bearing steel such as SUJ2, and are hardened in the range of 58 to 64 HRC to the core by quenching.
  • the wheel mounting flange 6 is cut out at a portion other than the vicinity of the bolt insertion hole 8 and protrudes radially from the annular base portion with substantially the same width as the formation portion of each bolt insertion hole 8.
  • the present invention is not limited to this, but it is not illustrated, but between the bolt insertion holes while avoiding the periphery of the bolt insertion holes, the R shape is deeper from the pitch circle diameter of the bolt insertion holes to the inner diameter side. It may be a wheel mounting flange having a flower shape in which a notch is formed.
  • the outer member 2 integrally has a vehicle body mounting flange 14 attached to a knuckle (not shown) constituting a suspension device on the outer periphery, and has a bolt insertion hole 15 formed in the outer peripheral portion.
  • the vehicle body mounting flange 14 has an R-shaped notch 16 that is deeper from the periphery of the bolt insertion hole 15 to the inner diameter side than the pitch circle diameter of the bolt insertion hole 15. Is formed. That is, the vehicle body mounting flange 14 is divided into a plurality (here, four) of partial flanges 14a that are separated in the circumferential direction. Further, as shown in FIG.
  • a cylindrical knuckle pilot portion 17 extending in the axial direction from the vehicle body mounting flange 14 is formed at the inner end of the outer member 2, and the outer diameter of the knuckle pilot portion 17 is formed.
  • a knuckle is fitted to the surface.
  • the outer member 2 is made of medium and high carbon steel containing 0.40 to 0.80 wt% of carbon such as S53C, and the inner periphery thereof has a plurality of inner rolling surfaces 4a and 5a facing the double rows of inner rolling surfaces 4a and 5a.
  • the outer rolling surfaces 2a, 2a of the rows are formed.
  • At least these double row outer raceway surfaces 2a and 2a are hardened by induction hardening to a surface hardness in the range of 58 to 64 HRC, and are held between the inner member 1 and outer member 2 rolling surfaces.
  • the double-row rolling elements 3 and 3 are accommodated by the vessels 18 and 18 so as to roll freely.
  • Seals 19 and 20 are attached to both ends of the outer member 2 to seal the annular space between the outer member 2 and the inner member 1. These seals 19 and 20 prevent leakage of the lubricating grease sealed inside the bearing and intrusion of rainwater, dust and the like from the outside into the bearing.
  • the wheel mounting flange 6 of the hub wheel 4 is cut out at a portion other than the vicinity of the bolt insertion hole 8, and only the portion where each bolt insertion hole 8 is formed has substantially the same width from the annular base to the outer diameter side. Since it is formed so as to protrude, the knuckle bolt can be easily fastened with a tool without being obstructed by the wheel mounting flange 6 when the outer member 2 is fastened to the knuckle. Work can be simplified.
  • the hub wheel 4 and the outer member 2 are significantly thinned, and the wheel mounting flange 6 and the vehicle body mounting flange 14 are formed by being divided into a plurality of partial flanges 6a and 14a, which are completely different from conventional disk-shaped flanges. Therefore, the lightest weight can be achieved while ensuring the strength and durability.
  • the wheel bearing device referred to as the third generation in which the inner raceway surface 4a is formed directly on the outer periphery of the hub wheel 4 is illustrated, but the wheel bearing device according to the present invention is not limited to such a structure.
  • a wheel bearing device having a first generation or second generation structure in which a pair of inner rings are press-fitted into a small-diameter step portion of a hub ring may be used.
  • the wheel bearing apparatus comprised by the double row angular contact ball bearing which used the rolling elements 3 and 3 as a ball
  • the hub wheel 4 and the outer member 2 are formed by hot forging, subsequent cold forging, and two forging processes.
  • the manufacturing method of the hub wheel 4 according to the present invention will be described in detail.
  • the hub wheel 4 is hot forged from a bar material as a raw material and then partially cold forged. And it heat-processes through a turning process, and is completed by an assembly process after a grinding process and a super finishing process.
  • a predetermined forging shape as shown in FIG. 4 is formed by hot forging.
  • both side faces 23 'and 24' of the wheel mounting flange 6 and the pilot part 12 are forged in a state where a machining allowance such as a predetermined turning allowance is left.
  • a recess 26 ′ extending in a mortar shape from the outer end surface 21 ′ toward the inner side is formed, and a through hole 27 opening from the recess 26 ′ to the inner end surface 2 ′ is formed.
  • the hub wheel 4 ' is formed into a hollow shaft by punching.
  • a side surface (indicated by a two-dot chain line in the drawing) 28 of the plurality of partial flanges 6a ′ and 6a ′ constituting the wheel mounting flange 6 ′ has a shape in which a root portion 28a is narrower than a tip portion 28b. Is formed.
  • the recess 26 ′ is formed in a convex arc shape from the inner diameter surface of the pilot portion 12, and the hollow hub wheel 4 ′ is formed with a uniform thickness substantially the same as the thickness of the wheel mounting flange 6 ′. ing.
  • forging is performed in a state in which both side surfaces 23 and 24 of the wheel mounting flange 6 and the mortar-shaped recess 26 leave a predetermined turning allowance (indicated by a two-dot chain line in the figure).
  • the die for cold forging includes an outer end surface 21 ′, an outer side surface 23 ′ of the wheel mounting flange 6 ′, a punch 29 that forms an inner peripheral portion, and a wheel. It is constituted by a die 30 that forms an inner side surface 24 ′, a base portion 9 ′, an inner rolling surface 4a ′, a counter portion 25 ′, and a small-diameter step portion 4b ′ of the mounting flange 6 ′.
  • the shape and dimensions of the side surfaces 28 in the circumferential direction of the plurality of partial flanges 6a 'and 6a' constituting the wheel mounting flange 6 ' are greatly changed. That is, the constricted root portion 28a is formed in a smooth arc shape gradually spreading from the tip portion 28b by cold forging while the tip portion 28b is constrained by a die, and the wheel mounting flange is formed by smooth plastic flow of the material. 6 'is thinned by at least 10%, and the root portion 28a constricted by the remaining extrusion portion at the time of molding is formed into a die shape. Further, as shown in FIG.
  • the recess 26 is tapered from the outer side surface 24 of the wheel mounting flange 6 to reduce the thickness, and the hollow hub wheel 4 is replaced with the wheel mounting flange 6. It is formed to have a uniform wall thickness that is substantially the same as the wall thickness.
  • the hub wheel 4 is subjected to cold forging at a site where strength is required after hot forging, the work load by cold forging increases the strength of the high-load portion and reduces the weight. It is possible to provide a wheel bearing device that solves the conflicting problem of increasing rigidity and extends the life of the bearing. In addition, it is possible to reduce the processing force by partial cold forging, to make the forging equipment compact, as well as to oil lubrication without needing to be bonded as in the past, reducing cutting cost and low cost. Can be achieved.
  • the outer member 2 is hot forged from a bar material as a material, and then partially cold forged, like the hub wheel 4. And it heat-processes through a turning process, and is completed by an assembly process after a grinding process and a super finishing process.
  • both end surfaces, both side surfaces of the partial flange 14a constituting the vehicle body mounting flange 14, the knuckle pilot portion 17 on which the knuckle is fitted, and the seals 19 and 20 are attached.
  • the seal fitting surface, the double-row outer rolling surfaces 2a, 2a, and the inner diameter surface are forged with a predetermined turning allowance left by hot forging and partial cold forging.
  • the partial flange 14a is thinned, and the outer side surface of the partial flange 14a and the corners of the outer peripheral surface are formed in an arc shape having a predetermined radius of curvature by the remaining extruded portion at the time of molding.
  • the circumferential side surfaces of the plurality of partial flanges 14a, 14a are formed in a smooth arc shape that gradually spreads from the tip portion toward the root portion.
  • the present invention can be applied to a wheel bearing device having a first to third generation structure provided with a hub wheel integrally having a wheel mounting flange.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

L'invention vise à proposer une unité de support de roue motrice et son procédé de fabrication, l'unité de support étant réduite en termes de coûts par réduction d'une tolérance de coupe et ayant la résistance d'une partie de charge élevée accrue pour résoudre le problème mutuellement contradictoire consistant à parvenir à une réduction de poids et à une amélioration de la rigidité, permettant ainsi de fournir une durée de vie utile allongée pour le support. À cet effet, selon l'invention, une unité de support de roue motrice est conçue de sorte que : une bride de montage de roue motrice (6) soit composée d'une pluralité de brides partielles (6a) qui sont divisées dans la direction circonférentielle ; des parties pilotes (12) s'étendent de la bride de montage de roue motrice (6) vers le côté externe et comportent des encoches à une pluralité de positions dans la direction circonférentielle de façon à être formées selon la forme de pièces projetées par intermittence ; les parties pilotes (12) étant disposées chacune entre chacune des brides partielles (6a) ; et un moyeu (4) soit formé en deux étapes de forgeage, c'est-à-dire, par forgeage à chaud puis par forgeage à froid, de sorte qu'au moins la partie de base de la bride de montage de roue motrice (6) soit forgée à froid.
PCT/JP2011/072345 2010-09-30 2011-09-29 Unité de support de roue motrice et son procédé de fabrication Ceased WO2012043706A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2010220756A JP2012076481A (ja) 2010-09-30 2010-09-30 車輪用軸受装置およびその製造方法
JP2010-220756 2010-09-30
JP2010220755A JP2012076480A (ja) 2010-09-30 2010-09-30 車輪用軸受装置およびその製造方法
JP2010-220755 2010-09-30

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WO2012043706A1 true WO2012043706A1 (fr) 2012-04-05

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113302412A (zh) * 2019-01-25 2021-08-24 Ntn株式会社 车轮用轴承装置

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Publication number Priority date Publication date Assignee Title
JP2006123890A (ja) * 2004-10-01 2006-05-18 Jtekt Corp 転がり軸受装置及びその製造方法
JP2006142916A (ja) * 2004-11-17 2006-06-08 Nsk Ltd 車輪支持用転がり軸受ユニット
JP2007152413A (ja) * 2005-12-08 2007-06-21 Nsk Ltd 車輪支持用転がり軸受ユニットを構成する軌道輪部材の製造方法
JP2008194742A (ja) * 2007-02-15 2008-08-28 Ntn Corp フランジ構造体製造方法
JP2008307563A (ja) * 2007-06-13 2008-12-25 Ntn Corp フランジ構造体の製造方法
JP2009255751A (ja) * 2008-04-17 2009-11-05 Nsk Ltd 外向フランジ部付金属製部材及びその製造方法
JP2010013039A (ja) * 2008-07-07 2010-01-21 Nsk Ltd 車輪支持用転がり軸受ユニット及びその製造方法
JP2010089522A (ja) * 2008-10-03 2010-04-22 Nsk Ltd 車輪支持用転がり軸受ユニットの製造方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006123890A (ja) * 2004-10-01 2006-05-18 Jtekt Corp 転がり軸受装置及びその製造方法
JP2006142916A (ja) * 2004-11-17 2006-06-08 Nsk Ltd 車輪支持用転がり軸受ユニット
JP2007152413A (ja) * 2005-12-08 2007-06-21 Nsk Ltd 車輪支持用転がり軸受ユニットを構成する軌道輪部材の製造方法
JP2008194742A (ja) * 2007-02-15 2008-08-28 Ntn Corp フランジ構造体製造方法
JP2008307563A (ja) * 2007-06-13 2008-12-25 Ntn Corp フランジ構造体の製造方法
JP2009255751A (ja) * 2008-04-17 2009-11-05 Nsk Ltd 外向フランジ部付金属製部材及びその製造方法
JP2010013039A (ja) * 2008-07-07 2010-01-21 Nsk Ltd 車輪支持用転がり軸受ユニット及びその製造方法
JP2010089522A (ja) * 2008-10-03 2010-04-22 Nsk Ltd 車輪支持用転がり軸受ユニットの製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113302412A (zh) * 2019-01-25 2021-08-24 Ntn株式会社 车轮用轴承装置

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