WO2022059685A1 - 車輪用軸受装置 - Google Patents

車輪用軸受装置 Download PDF

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Publication number
WO2022059685A1
WO2022059685A1 PCT/JP2021/033809 JP2021033809W WO2022059685A1 WO 2022059685 A1 WO2022059685 A1 WO 2022059685A1 JP 2021033809 W JP2021033809 W JP 2021033809W WO 2022059685 A1 WO2022059685 A1 WO 2022059685A1
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WO
WIPO (PCT)
Prior art keywords
ring
bearing device
wheel
wheel bearing
outer side
Prior art date
Application number
PCT/JP2021/033809
Other languages
English (en)
French (fr)
Inventor
司 渡邉
Original Assignee
Ntn株式会社
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
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Priority to EP21869371.1A priority Critical patent/EP4215771A4/en
Priority to CN202180051231.3A priority patent/CN116057290A/zh
Priority to US18/020,315 priority patent/US20230286320A1/en
Publication of WO2022059685A1 publication Critical patent/WO2022059685A1/ja

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Classifications

    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
    • F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
    • F16J15/3256—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0073—Hubs characterised by sealing means
    • 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
    • F16C19/182—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 in tandem arrangement
    • 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
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/768—Sealings of ball or roller bearings between relatively stationary parts, i.e. static seals
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/783—Details of the sealing or parts thereof, e.g. geometry, material of the mounting region
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/7833—Special methods of manufacture
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7873—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section
    • F16C33/7876—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section with sealing lips
    • 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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
    • F16C33/7883—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring mounted to the inner race and of generally L-shape, the two sealing rings defining a sealing with box-shaped cross-section
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/14—Sealings between relatively-stationary surfaces by means of granular or plastic material, or fluid
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3268—Mounting of sealing rings
    • F16J15/3276—Mounting of sealing rings with additional static sealing between the sealing, or its casing or support, and the surface on which it is mounted
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/40—Sealings between relatively-moving surfaces by means of fluid
    • 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
    • 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.
  • the wheel bearing device is provided with a sealing member between the outer member and the inner member to prevent foreign matter such as muddy water from entering.
  • the outer side sealing member of the wheel bearing device is fitted to the outer side end portion of the outer member, and closes the outer side opening end of the annular space formed by the outer member and the inner member.
  • the sealing structure of the sealing member is devised to ensure the sealing property (see, for example, Patent Document 1).
  • an adhesive having oil level adhesiveness is filled in the gap existing between the curved surface portion of the slinger and the peripheral surface of the rotating side raceway ring over the entire circumference. is doing. As a result, the sealing property of the fitting portion between the slinger and the rotating side raceway ring is ensured.
  • the present invention has been made in view of the above circumstances, and provides a wheel bearing device provided with an outer side seal that is resistant to deterioration over time and can prevent foreign matter such as muddy water from entering the inside of the bearing. With the goal.
  • the first invention has an outer member having a double row of outer raceway surfaces on the inner circumference, a small diameter step portion extending in the axial direction on the outer periphery, and a wheel mounting flange arranged on the outer side of the small diameter step portion.
  • An inner member composed of a hub wheel and at least one inner ring press-fitted into the small diameter step portion of the hub wheel, and having a double-row inner raceway surface facing the outer raceway plane of the double-row on the outer periphery, and an inner member thereof.
  • the outer end of the annular space formed by the outer member and the inner member, and the double-row rolling elements rotatably accommodated between the respective race planes of the member and the outer member.
  • the outer side sealing member includes an outer side sealing member for closing, and the outer side sealing member is fitted to a core metal fitted to the outer member, a sealing member joined to the core metal, and a hub wheel of the inner member. It has a metal ring to which the sealing member is slidably contacted, an annular space is provided between the metal ring and the hub ring, and the annular space is filled with a filler.
  • the present invention by filling the annular space between the metal ring and the hub wheel with the filler, it is possible to prevent foreign matter such as muddy water from entering the inside of the bearing through the annular space, and it is resistant to foreign matter. It is possible to provide a wheel bearing device provided with an outer side sealing member having improved muddy water.
  • the cross-sectional view which shows the whole structure in 1st Embodiment of a wheel bearing apparatus.
  • the enlarged sectional view which shows the outer side seal member in 1st Embodiment of a wheel bearing apparatus.
  • the enlarged sectional view which shows the outer side seal member in the 2nd Embodiment of a wheel bearing apparatus.
  • the enlarged sectional view which shows the outer side seal member in the 3rd Embodiment of a wheel bearing apparatus.
  • the wheel bearing device 1 which is the first embodiment of the wheel bearing device will be described with reference to FIGS. 1 and 2.
  • the inner side represents the vehicle body side of the wheel bearing device 1 when attached to the vehicle body
  • the outer side represents the wheel side of the wheel bearing device 1 when attached to the vehicle body. ..
  • the wheel bearing device 1 rotatably supports wheels in a suspension device of a vehicle such as an automobile.
  • the wheel bearing device 1 includes an outer ring 2, a hub ring 3, an inner ring 4, a rolling element 5, an inner side sealing member 6, and an outer side sealing member 7.
  • the outer ring 2 which is an outer member supports the hub ring 3 and the inner ring 4.
  • the inner end of the outer ring 2 is provided with an inner opening 2b into which the inner seal member 6 can be fitted.
  • the outer side end 2f of the outer ring 2 is provided with an outer side opening 2c into which the outer side seal member 7 can be fitted.
  • the outer peripheral surface 2e of the outer ring 2 is integrally provided with a vehicle body mounting flange 2d for mounting on a knuckle of a suspension device (not shown).
  • double rows of inner raceway surfaces 2a and 2a are provided on the inner side and the outer side thereof in the circumferential direction.
  • the inner member is composed of a hub wheel 3 and an inner ring 4.
  • the hub wheel 3 rotatably supports a wheel of a vehicle (not shown).
  • a small diameter step portion 3a having a reduced diameter is provided on the outer peripheral surface.
  • a wheel mounting flange 3b for mounting a wheel is integrally provided at the outer end of the hub wheel 3.
  • a hub bolt 3c for fastening the hub wheel 3 to the wheel or the brake device is press-fitted into the wheel mounting flange 3b.
  • an inner raceway surface 3d is provided on the outer peripheral surface of the hub wheel 3 on the outer side.
  • a shoulder portion 3e, a curved surface portion 3f, and a flat surface portion 3g which are portions where the outer side sealing member 7 is arranged, are continuously provided (see FIG. 2 and the like). ..
  • the flat surface portion 3g is located at the base end portion of the wheel mounting flange 3b.
  • the inner ring 4 is press-fitted into the small diameter step portion 3a of the hub ring 3.
  • An inner raceway surface 4a is provided on the outer peripheral surface of the inner ring 4. That is, on the inner side of the hub ring 3, the inner raceway surface 4a is formed by the inner ring 4.
  • the rolling element 5 has a plurality of balls and a cage for holding the balls.
  • the inner side sealing member 6 has a substantially cylindrical sealing plate 6a and a substantially cylindrical slinger 6b.
  • the seal plate 6a is fitted to the inner opening 2b of the outer ring 2, and the slinger 6b is fitted to the inner ring 4.
  • the outer side sealing member 7 closes the outer side opening end of the annular space formed by the outer ring 2 and the hub ring 3.
  • the outer side sealing member 7 has a core metal 8, a metal ring 9, a sealing member 10, and a sealing material 20.
  • the core metal 8 is formed by, for example, pressing a steel plate. As shown in FIG. 2, the core metal 8 includes a cylindrical portion 8a and a bent portion 8b.
  • the cylindrical portion 8a is fitted to the outer side opening 2c of the outer ring 2 (the inner peripheral surface of the outer ring 2 end on the outer side 2f).
  • the bent portion 8b extends inward in the radial direction while being bent from the outer side end portion of the cylindrical portion 8a.
  • a sealing member 10 made of, for example, synthetic rubber is bonded to the core metal 8 (here, vulcanization adhesion).
  • the radial lip 10a, the inner axial lip 10b, and the outer axial lip 10c of the sealing member 10 are joined to the bent portion 8b.
  • the radial lip 10a is provided on the innermost side in the radial direction of the bent portion 8b.
  • the radial lip 10a prevents the grease inside the wheel bearing device 1 from leaking to the outside.
  • the inner axial lip 10b is provided radially outside the radial lip 10a.
  • the outer axial lip 10c is provided radially outward of the inner axial lip 10b.
  • the metal ring 9 is formed by, for example, pressing a steel plate.
  • the metal ring 9 includes a cylindrical portion 9a, a curved portion 9b, a disk portion 9c, a tapered portion 9d, and a flange portion 9e.
  • the cylindrical portion 9a is fitted to the shoulder portion 3e (the portion adjacent to the inner peripheral raceway surface 3d on the outer side) of the hub ring 3.
  • a radial lip 10a is in sliding contact with the cylindrical portion 9a via a grease oil film.
  • the curved portion 9b has a substantially arc shape in a cross-sectional view, and the diameter of the curved portion 9a expands radially outward from the outer side end portion of the cylindrical portion 9a toward the outer side.
  • An inner axial lip 10b is in sliding contact with the curved portion 9b via a grease oil film.
  • the disk portion 9c extends radially outward from the tip portion of the curved portion 9b.
  • the outer axial lip 10c is in sliding contact with the disk portion 9c via a grease oil film.
  • the disk portion 9c faces the flat surface portion 3g of the hub ring 3.
  • the curved portion 9b is a portion between the portion of the metal ring 9 fitted to the hub ring 3 and the portion facing the wheel mounting flange 3b. Further, the curved portion 9b of the metal ring 9 is provided to improve the rigidity of the metal ring 9. By providing the curved portion 9b, the rigidity of the metal ring 9 can be improved, and the movement of the metal ring 9 when the turning load of the vehicle is applied can be suppressed.
  • the diameter of the tapered portion 9d increases from the outer peripheral edge of the disc portion 9c toward the inner side.
  • the flange portion 9e extends radially outward from the tip portion of the tapered portion 9d.
  • the hub ring 3 faces the curved portion 9b of the metal ring 9 and has a curved surface portion 3f which is an outer peripheral surface having a substantially arcuate cross-sectional view.
  • the curved surface portion 3f is formed over the entire circumference of the hub ring 3.
  • the curved surface portion 3f expands in diameter outward in the radial direction from the outer side end of the shoulder portion 3e of the hub wheel 3 toward the outer side.
  • An annular space S having a substantially crescent shape in cross-sectional view is provided between the curved portion 9b and the curved surface portion 3f.
  • the annular space S is filled with a sealing material 20 which is an example of a filler.
  • the sealing material 20 is a material that is applied to a space (gap) portion of a structure to exhibit functions such as waterproofness and airtightness.
  • the sealing material 20 of the present embodiment is held in the form of a gel (paste). That is, the sealing material 20 of the present embodiment is not cured.
  • the sealing material 20 has a predetermined viscosity.
  • the sealing material 20 can be variously selected from acrylic type, urethane type, polyurethane type, silicon type, modified silicon, oil-based caulking type, polysulfide type, butyl rubber type and the like.
  • the sealing material is annularly formed along the circumferential direction of the annular curved surface portion 3f of the hub ring 3.
  • the upper limit is the volume of the annular space S, that is, the space volume between the hub ring 3 (curved surface portion 3f) and the metal ring 9 (curved portion 9b) is sealed.
  • the amount is 100% when filled with the material 20 (the amount does not protrude to the outside of the annular space S), and the lower limit is at least the sealing material 20 evenly in the fitting portion between the hub ring 3 and the metal ring 9. Is the amount to be applied.
  • the sealing material 20 can exhibit functions such as waterproofness and airtightness.
  • annular space S is provided between the curved portion 9b of the metal ring 9 and the curved surface portion 3f of the hub ring 3, and the annular space S is filled with the sealing material 20.
  • foreign matter such as muddy water can be prevented from entering the inside of the bearing through the annular space S, and the muddy water resistance can be improved. That is, as shown in FIG. 5, since the conventional wheel bearing device has an annular space S, foreign matter such as muddy water may accumulate in the annular space S and the foreign matter such as muddy water may infiltrate into the bearing.
  • the sealing material 20 plays a role of closing the annular space S, which is one of the routes for foreign substances such as muddy water to enter. Further, since the sealing material 20 of the present embodiment is held in a gel form (paste form) without being cured, deterioration over time such as cracking due to curing can be suppressed.
  • the outer side seal member 7 of the wheel bearing device 1 is not provided with a rubber member unlike the conventional wheel bearing device shown in FIG. Therefore, in the wheel bearing device 1, it is not necessary to provide a region for arranging the rubber member on the flat surface portion 3g which is the contact surface of the metal ring 9 (disk portion 9c) in the hub wheel 3, and the outer side sealing member. Can be miniaturized. Further, since the outer side seal member 7 of the wheel bearing device 1 is not provided with a rubber member, there is an advantage that design restrictions are not applied even when the outer side seal member and peripheral parts such as the head portion of the hub bolt are close to each other. There is. Further, since the outer side seal member 7 of the wheel bearing device 1 is not provided with the rubber member, the cost can be reduced.
  • the wheel bearing device 1A which is the second embodiment of the wheel bearing device according to the present invention, will be described with reference to FIG.
  • the wheel bearing device 1A according to the present embodiment is a modification of the first embodiment, and a rubber member 11 is added to the outer side seal member 7 of the wheel bearing device 1 according to the first embodiment.
  • a rubber member 11 is bonded (here, vulcanized and bonded) to a surface of the disk portion 9c, the tapered portion 9d, and the flange portion 9e that faces the flat surface portion 3g of the hub ring 3 in the axial direction.
  • the rubber member 11 is, for example, synthetic rubber.
  • the rubber member 11 is provided on the radial outer side of the metal ring 9, and is in contact with the flat surface portion 3g of the hub ring 3.
  • the wheel bearing device 1A has the same effect as the wheel bearing device 1 of the first embodiment, and since the rubber member 11 is provided, foreign matter such as muddy water further invades the inside of the bearing. It can be suppressed.
  • the wheel bearing device 1B which is the third embodiment of the wheel bearing device according to the present invention, will be described with reference to FIG.
  • the wheel bearing device 1B according to the present embodiment is a modification of the first embodiment, and includes a bent portion 9b1 instead of the curved portion 9b in the wheel bearing device 1 according to the first embodiment.
  • the bent portion 9b1 has a linear shape in a cross-sectional view, and the diameter of the bent portion 9b 1 is increased radially outward from the outer side end portion of the cylindrical portion 9a toward the outer side.
  • the bent portion 9b1 is a portion between a portion of the metal ring 9 fitted to the hub ring 3 and a portion facing the wheel mounting flange 3b.
  • An annular space S1 having a substantially semi-elliptical cross-sectional view is provided between the bent portion 9b1 and the curved surface portion 3f.
  • the annular space S1 is filled with the sealing material 20.
  • the wheel bearing device 1B has the same effect as the wheel bearing device 1 of the first embodiment. Further, when the bent portion 9b1 is formed in a straight line, the annular space S1 becomes large, but by filling the annular space S1 with the sealing material 20 as a filler, the annular space S1 can be easily sealed. It has become. This further improves the mud water resistance.
  • the wheel bearing device 1B may also be configured by adding the rubber member 11 as in the wheel bearing device 1A of the second embodiment.
  • the wheel bearing devices 1, 1A, and 1B according to the present embodiment have been described as a wheel bearing device having a third generation structure in which the inner raceway surface 3d of the rolling element 5 is directly formed on the outer periphery of the hub wheel 3.
  • the present invention is not limited to this, and for example, a second generation structure of inner ring rotation in which a pair of inner rings 4 are press-fitted and fixed to the hub wheel 3 may be used.
  • the above-described embodiment merely shows a typical embodiment of the present invention, and can be variously modified and carried out within a range that does not deviate from the gist of the present invention.
  • the present invention can be used for a wheel bearing device.

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Abstract

経時劣化に強く、軸受内部への泥水等の異物の侵入を防止することができるアウター側シールを備えた車輪用軸受装置を提供する。　外輪２とハブ輪３とによって形成された環状空間のうちアウター側開口端を塞ぐアウター側シール部材７を備え、アウター側シール部材７が、外輪２に嵌合される芯金８と、芯金８に接合されるシール部材１０と、ハブ輪３に嵌合されてシール部材１０が摺接する金属環９とを有する、車輪用軸受装置であって、前記金属環９と前記ハブ輪３との間に環状空間Ｓを設けて、当該環状空間Ｓにシーリング材２０が充填される。

Description

車輪用軸受装置
　本発明は車輪用軸受装置に関する。
　車輪用軸受装置には、泥水等の異物の入り込みを防止するシール部材が外方部材と内方部材との間に設けられている。車輪用軸受装置のアウター側シール部材は、外方部材のアウター側端部に嵌合され、外方部材と内方部材とによって形成された環状空間のアウター側開口端を塞いでいる。
　車輪用軸受装置において、シール部材のシール構造を工夫してシール性を確保しているものがある（例えば、特許文献１参照）。
　特許文献１に開示された車輪用軸受装置では、スリンガの曲面部と回転側軌道輪の周面との間に存在する隙間に、油面接着性を有する接着剤を、全周に亘って充填している。これにより、スリンガと回転側軌道輪との嵌合部のシール性を確保している。
　しかしながら、このような従来のシール構造では、経時劣化等により硬化した接着剤に亀裂が入った場合、シール性が低下するおそれがある。そのため、経時劣化にも強く、泥水等の異物の侵入を防止できるように構成されたシール部材が求められる。
特許第４８９３６４８号公報
　本発明は以上の如き状況に鑑みてなされたものであり、経時劣化にも強く、軸受内部への泥水等の異物の侵入を防止することができるアウター側シールを備えた車輪用軸受装置の提供を目的とする。
　第一の発明は、内周に複列の外側軌道面を有する外方部材と、外周に軸方向に延びる小径段部、および前記小径段部よりもアウター側に配置される車輪取り付けフランジを有するハブ輪、ならびにこのハブ輪の小径段部に圧入された少なくとも一つの内輪からなり、外周に前記複列の外側軌道面に対向する複列の内側軌道面を有する内方部材と、この内方部材と前記外方部材のそれぞれの軌道面間に転動自在に収容された複列の転動体と、前記外方部材と前記内方部材とによって形成された環状空間のうちアウター側開口端を塞ぐアウター側シール部材と、を備え、前記アウター側シール部材は、前記外方部材に嵌合された芯金と、前記芯金に接合されたシール部材と、前記内方部材のハブ輪に嵌合されて前記シール部材が摺接する金属環とを有し、前記金属環と前記ハブ輪との間に環状空間を設けて、当該環状空間に充填剤が充填される。
　本発明によれば、金属環とハブ輪との間の環状空間に充填剤を充填することにより、当該環状空間を介しての軸受内部への泥水等の異物の侵入を防ぐことができ、耐泥水性が向上されたアウター側シール部材を備えた車輪用軸受装置を提供することができる。
車輪用軸受装置の第一実施形態における全体構成を示す断面図。 車輪用軸受装置の第一実施形態におけるアウター側シール部材を示す拡大断面図。 車輪用軸受装置の第二実施形態におけるアウター側シール部材を示す拡大断面図。 車輪用軸受装置の第三実施形態におけるアウター側シール部材を示す拡大断面図。 従来の車輪用軸受装置のアウター側シール部材を示す拡大断面図。
　以下に、図１及び図２を用いて、車輪用軸受装置の第一実施形態である車輪用軸受装置１について説明する。なお、以下の説明において、インナー側とは、車体に取り付けた際の車輪用軸受装置１の車体側を表し、アウター側とは、車体に取り付けた際の車輪用軸受装置１の車輪側を表す。
　図１に示すように、車輪用軸受装置１は、自動車等の車両の懸架装置において車輪を回転自在に支持する。車輪用軸受装置１は、外輪２、ハブ輪３、内輪４、転動体５、インナー側シール部材６およびアウター側シール部材７を具備する。
　図１に示すように、外方部材である外輪２は、ハブ輪３と内輪４とを支持する。外輪２のインナー側端部には、インナー側シール部材６が嵌合可能なインナー側開口部２ｂが設けられている。外輪２のアウター側端部２ｆには、アウター側シール部材７を嵌合可能なアウター側開口部２ｃが設けられている。外輪２の外周面２ｅには、図示しない懸架装置のナックルに取り付けるための車体取り付けフランジ２ｄが一体に設けられている。外輪２の内周面には、そのインナー側及びアウター側に周方向に複列の内側軌道面２ａ・２ａが設けられている。
　内方部材は、ハブ輪３と内輪４とによって構成されている。ハブ輪３は、図示しない車両の車輪を回転自在に支持する。ハブ輪３のインナー側端部には、外周面に縮径された小径段部３ａが設けられている。ハブ輪３のアウター側端部には、車輪を取り付けるための車輪取り付けフランジ３ｂが一体的に設けられている。車輪取り付けフランジ３ｂには、ハブ輪３と車輪又はブレーキ装置とを締結するためのハブボルト３ｃが圧入されている。また、ハブ輪３のアウター側の外周面には、内側軌道面３ｄが設けられている。内側軌道面３ｄよりもアウター側の外周面には、アウター側シール部材７が配置される部分である、肩部３ｅ、曲面部３ｆ、平面部３ｇが連続して設けられる（図２等参照）。平面部３ｇは、車輪取り付けフランジ３ｂの基端部に位置している。
　内輪４は、ハブ輪３の小径段部３ａに圧入されている。内輪４の外周面には、内側軌道面４ａが設けられている。つまり、ハブ輪３のインナー側には、内輪４によって内側軌道面４ａが構成されている。
　転動体５は、複数のボールと、当該ボールを保持する保持器とを有している。
　インナー側シール部材６は、略円筒状のシール板６ａと略円筒状のスリンガ６ｂとを有している。シール板６ａは外輪２のインナー側開口部２ｂに嵌合され、スリンガ６ｂは内輪４に嵌合されている。
　図１及び図２に示すように、アウター側シール部材７は、外輪２とハブ輪３とによって形成された環状空間のうちアウター側開口端を塞いでいる。アウター側シール部材７は、芯金８と、金属環９と、シール部材１０と、シーリング材２０とを有している。
　芯金８は、例えば鋼板をプレス加工することによって形成されている。図２に示すように、芯金８は、円筒部８ａと屈曲部８ｂとを含んでいる。
　円筒部８ａは、外輪２のアウター側開口部２ｃ（外輪２のうちアウター側端部２ｆの内周面）に嵌合している。屈曲部８ｂは、円筒部８ａのアウター側端部から屈曲しつつ径方向内方に延びている。
　芯金８には、例えば合成ゴムからなるシール部材１０が接合（ここでは、加硫接着）されている。屈曲部８ｂには、シール部材１０のラジアルリップ１０ａ、内側アキシアルリップ１０ｂ及び外側アキシアルリップ１０ｃが接合されている。ラジアルリップ１０ａは、屈曲部８ｂの最も径方向内側に設けられている。ラジアルリップ１０ａは、車輪用軸受装置１の内部のグリースが外部へ漏れることを防止している。内側アキシアルリップ１０ｂは、ラジアルリップ１０ａよりも径方向外側に設けられている。外側アキシアルリップ１０ｃは、内側アキシアルリップ１０ｂよりも径方向外側に設けられている。
　金属環９は、例えば鋼板をプレス加工することによって形成されている。金属環９は、円筒部９ａと、湾曲部９ｂと、円板部９ｃと、テーパ部９ｄと、鍔部９ｅとを含んでいる。
　円筒部９ａは、ハブ輪３の肩部３ｅ（内周軌道面３ｄとアウター側で隣接している部分）に嵌合している。円筒部９ａには、ラジアルリップ１０ａがグリース油膜を介して摺接している。湾曲部９ｂは、断面視において略円弧状であり、円筒部９ａのアウター側端部からアウター側に向かうにつれて径方向外側に拡径している。湾曲部９ｂには、内側アキシアルリップ１０ｂがグリース油膜を介して摺接している。円板部９ｃは、湾曲部９ｂの先端部から径方向外側に延びている。円板部９ｃには、外側アキシアルリップ１０ｃがグリース油膜を介して摺接している。円板部９ｃは、ハブ輪３の平面部３ｇと対向している。なお、湾曲部９ｂは、金属環９におけるハブ輪３に嵌合される部分と、車輪取り付けフランジ３ｂに対向する部分との間の部分である。
　また、金属環９の湾曲部９ｂは、金属環９の剛性を向上させるために設けられたものである。この湾曲部９ｂを設けたことで、金属環９の剛性を向上して、車両の旋回荷重が付与された際の金属環９の移動を抑制することができる。
　テーパ部９ｄは、円板部９ｃの外周縁からインナー側に向かうにつれて拡径している。鍔部９ｅは、テーパ部９ｄの先端部から径方向外側に延びている。
　ハブ輪３は、金属環９の湾曲部９ｂに対向するとともに断面視略円弧状の外周面である曲面部３ｆを有している。曲面部３ｆは、ハブ輪３の全周に亘って形成される。曲面部３ｆは、ハブ輪３の肩部３ｅのアウター側端からアウター側に向かうにつれて径方向外側に拡径している。湾曲部９ｂと曲面部３ｆとの間には、断面視略三日月形状の環状空間Ｓが設けられている。環状空間Ｓには、充填剤の一例であるシーリング材２０が充填されている。シーリング材２０は、構造体の空間（隙間）部分に塗布して、防水性や気密性などの機能を発揮させる材料である。本実施形態のシーリング材２０は、ゲル状（ペースト状）に保持されている。すなわち、本実施形態のシーリング材２０は、硬化させていない。シーリング材２０は、所定の粘性を有している。シーリング材２０としては、アクリル系、ウレタン系、ポリウレタン系、シリコン系、変成シリコン、油性コーキング系、ポリサルファイド系、及びブチルゴム系等から種々選択できる。
　シーリング材２０を環状空間Ｓに充填する方法としては、例えばハブ輪３にアウター側シール部材７を組み付ける前にハブ輪３の円環状の曲面部３ｆの周方向に沿って、円環状にシーリング材２０を塗布装置を用いて塗布して、シーリング材２０が塗布されたハブ輪３にアウター側シール部材７を組み付けることで、塗布されたシーリング材２０が環状空間Ｓ内に広がって充填される。こうして、シーリング材２０によって環状空間Ｓが封じられる。
　また、シーリング材２０の環状空間Ｓへの充填量について、上限値としては環状空間Ｓの容積、すなわちハブ輪３（曲面部３ｆ）と金属環９（湾曲部９ｂ）の間の空間容積をシーリング材２０で満たして１００％となる量（環状空間Ｓの外部にはみ出さない量）であり、下限値としては少なくともハブ輪３と金属環９との嵌合部に隙間なく均一にシーリング材２０が塗布される量である。このような充填量の範囲であれば、シーリング材２０は、防水性や気密性などの機能を発揮することができる。
　以上に説明した構成によれば、金属環９の湾曲部９ｂとハブ輪３の曲面部３ｆとの間に環状空間Ｓを設けて、当該環状空間Ｓにシーリング材２０が充填されている。これにより、当該環状空間Ｓを介しての軸受内部への泥水等の異物の侵入を防ぎ、耐泥水性を向上させることができる。すなわち、図５に示すように従来の車輪用軸受装置では環状空間Ｓを有するため、環状空間Ｓに泥水等の異物が溜まって当該泥水等の異物が軸受内部に浸入するおそれがあった。一方、本実施形態の車輪用軸受装置１ではシーリング材２０により環状空間Ｓが封じられているため、環状空間Ｓに泥水等の異物が溜まることを抑えて、泥水等の異物が軸受内部へ侵入を防ぐことができる。つまり、シーリング材２０は、泥水等の異物が侵入する経路の一つとなる環状空間Ｓを塞ぐ役割をしている。また、本実施形態のシーリング材２０は、硬化させずにゲル状（ペースト状）で保持されるため、硬化による割れ等の経時劣化が抑えられる。
　また、車輪用軸受装置１のアウター側シール部材７では、図５に示す従来の車輪用軸受装置のように、ゴム部材を設けていない。そのため、車輪用軸受装置１では、ハブ輪３における金属環９（円板部９ｃ）の当接面となる平面部３ｇにゴム部材を配置するための領域を設ける必要が無く、アウター側シール部材の小型化を図ることができる。
　また、車輪用軸受装置１のアウター側シール部材７は、ゴム部材を設けないため、アウター側シール部材とハブボルトのヘッド部分などの周辺部品が近接している場合でも設計上の制約がかからないという利点がある。また、車輪用軸受装置１のアウター側シール部材７では、ゴム部材を設けていないため、コスト低減が可能となる。
　次に、図を用いて、本発明に係る車輪用軸受装置の変形例として第二実施形態及び第三実施形態について説明する。以下の各実施形態の説明では、各実施形態において追加、変更した部位について主に説明を行い、その他同一部品同一部位あるいは同様の機能を有する部品や部位には同じ符号を付して、その説明を省略する。
　[第二実施形態]
　次に、図３を用いて、本発明に係る車輪用軸受装置の第二実施形態である車輪用軸受装置１Ａについて説明する。本実施形態に係る車輪用軸受装置１Ａは、第一実施形態の変形例であり、第一実施形態である車輪用軸受装置１のアウター側シール部材７に、ゴム部材１１が追加されている。
　円板部９ｃ、テーパ部９ｄ及び鍔部９ｅのうちハブ輪３の平面部３ｇと軸方向に対向する面には、ゴム部材１１が接合（ここでは、加硫接着）されている。ゴム部材１１は、例えば、合成ゴムである。ゴム部材１１は、金属環９の径方向外側に設けられるとともに、ハブ輪３の平面部３ｇに接触している。
　これにより、車輪用軸受装置１Ａは、第一実施形態の車輪用軸受装置１と同様の効果を有するとともに、ゴム部材１１が設けられているため、軸受内部への泥水等の異物の侵入を更に抑制することができる。
　[第三実施形態]
　次に、図４を用いて、本発明に係る車輪用軸受装置の第三実施形態である車輪用軸受装置１Ｂについて説明する。本実施形態に係る車輪用軸受装置１Ｂは、第一実施形態の変形例であり、第一実施形態である車輪用軸受装置１における湾曲部９ｂの替わりに折曲部９ｂ１を含んでいる。折曲部９ｂ１は、断面視において直線状であり、円筒部９ａのアウター側端部からアウター側に向かうにつれて径方向外側に拡径している。折曲部９ｂ１は、金属環９におけるハブ輪３に嵌合される部分と、車輪取り付けフランジ３ｂに対向する部分との間の部分である。折曲部９ｂ１と曲面部３ｆとの間には、断面視略半楕円形状の環状空間Ｓ１が設けられている。環状空間Ｓ１には、シーリング材２０が充填されている。
　これにより、車輪用軸受装置１Ｂは、第一実施形態の車輪用軸受装置１と同様の効果を有する。また、折曲部９ｂ１を直線状に形成した場合、環状空間Ｓ１が大きくなるが、環状空間Ｓ１に充填剤であるシーリング材２０を充填することで、容易に環状空間Ｓ１を封じることが可能となっている。これにより、さらに耐泥水性が向上する。
　なお、車輪用軸受装置１Ｂにおいても第二実施形態の車輪用軸受装置１Ａのようにゴム部材１１を追加して構成してもよい。
　以上、本実施形態に係る車輪用軸受装置１・１Ａ・１Ｂは、ハブ輪３の外周に転動体５の内側軌道面３ｄが直接形成されている第３世代構造の車輪用軸受装置として説明したがこれに限定されるものではなく、例えば、ハブ輪３に一対の内輪４が圧入固定された内輪回転の第２世代構造であってもよい。また、上述の実施形態は、本発明の代表的な形態を示したに過ぎず、本発明の骨子を逸脱しない範囲で種々変形して実施することができる。
　本発明は、車輪用軸受装置に利用可能である。
　　１　　車輪用軸受装置
　　２　　外輪
　　２ａ　外側軌道面
　　２ｅ　外周面
　　２ｆ　アウター側端部
　　３　　ハブ輪
　　３ａ　小径段部
　　３ｂ　車輪取り付けフランジ
　　４　　内輪
　　４ａ　内側軌道面
　　５　　転動体
　　７　　アウター側シール部材
　　８　　芯金
　　９　　金属環
　　１０　シール部材
　　２０　シーリング材
　　Ｓ　　環状空間

Claims (4)

  1. 　内周に複列の外側軌道面を有する外方部材と、
    　外周に軸方向に延びる小径段部、および前記小径段部よりもアウター側に配置される車輪取り付けフランジを有するハブ輪、ならびにこのハブ輪の小径段部に圧入された少なくとも一つの内輪からなり、外周に前記複列の外側軌道面に対向する複列の内側軌道面を有する内方部材と、
    　この内方部材と前記外方部材のそれぞれの軌道面間に転動自在に収容された複列の転動体と、
    　前記外方部材と前記内方部材とによって形成された環状空間のうちアウター側開口端を塞ぐアウター側シール部材と、を備え、
    　前記アウター側シール部材は、前記外方部材に嵌合された芯金と、前記芯金に接合されたシール部材と、前記内方部材のハブ輪に嵌合されて前記シール部材が摺接する金属環とを有し、
    　前記金属環と前記ハブ輪との間に環状空間を設けて、当該環状空間に充填剤が充填される、車輪用軸受装置。
  2. 　前記充填剤は、シーリング材である、請求項１に記載の車輪用軸受装置。
  3. 　前記金属環の前記ハブ輪に嵌合される部分と、前記車輪取り付けフランジに対向する部分との間の部分は、断面視において直線状に形成されている、請求項１または請求項２に記載の車輪用軸受装置。
  4. 　前記金属環の径方向外側に設けられるとともに、前記ハブ輪に接触するゴム部材を有する、請求項１～請求項３の何れか一項に記載の車輪用軸受装置。
PCT/JP2021/033809 2020-09-18 2021-09-14 車輪用軸受装置 WO2022059685A1 (ja)

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JP2013242037A (ja) * 2012-04-25 2013-12-05 Nsk Ltd 車輪支持用転がり軸受ユニット
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