WO2021049158A1 - Sealing device - Google Patents

Sealing device Download PDF

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Publication number
WO2021049158A1
WO2021049158A1 PCT/JP2020/027341 JP2020027341W WO2021049158A1 WO 2021049158 A1 WO2021049158 A1 WO 2021049158A1 JP 2020027341 W JP2020027341 W JP 2020027341W WO 2021049158 A1 WO2021049158 A1 WO 2021049158A1
Authority
WO
WIPO (PCT)
Prior art keywords
flange
ring member
outer ring
back surface
sealing device
Prior art date
Application number
PCT/JP2020/027341
Other languages
French (fr)
Japanese (ja)
Inventor
祐也 坂野
Original Assignee
Nok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 Nok株式会社 filed Critical Nok株式会社
Priority to CN202080053691.5A priority Critical patent/CN114222869A/en
Priority to JP2021545138A priority patent/JPWO2021049158A1/ja
Publication of WO2021049158A1 publication Critical patent/WO2021049158A1/en

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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
    • 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
    • F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
    • F16C33/7823—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of sealing lips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
    • B60B35/12—Torque-transmitting axles
    • B60B35/18—Arrangement 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
    • 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
    • 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
    • F16C33/80—Labyrinth sealings
    • 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
    • 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

Definitions

  • the present invention relates to a sealing device used in a bearing device.
  • Patent Document 1 discloses a sealing device mounted on a bearing device that rotatably supports wheels of an automobile.
  • This bearing device is a so-called hub bearing and has an outer ring and an inner ring. A flange portion is formed on the inner ring.
  • a sealing device is provided between the outer ring and the inner ring of this bearing device.
  • the sealing device has a metal reinforcing ring and a sealing body integrally formed with the reinforcing ring.
  • the reinforcing ring includes a tubular portion and an outer diameter flange portion. The tubular portion is press-fitted into the inner part of the outer ring near the flange portion of the inner ring.
  • the outer diameter flange portion extends radially outward from one end of the tubular portion of the reinforcing ring.
  • the seal body has a dust lip, a grease lip, and a coating layer. The coating layer covers the outer diameter flange portion.
  • a gap is formed between the coating layer and the flange of the inner ring.
  • the coating layer has a tapered tubular labyrinth slip.
  • the labyrinth slip extends toward the flange. The tips of the dust lip and the grease lip come into contact with the inner ring.
  • the tip of the labyrinth slip faces the flange portion of the inner ring with a slight gap. That is, the tip of the labyrinth slip is not in contact with the flange portion of the inner ring.
  • the labyrinth seal is formed by a slight gap between the tip of the labyrinth slip and the flange portion of the inner ring.
  • This labyrinth seal it is possible to secure a certain degree of sealing property against the inflow of foreign matter (for example, rainwater, muddy water or dust) from the outside into the internal space of the bearing device.
  • This type of sealing device may require structural simplification for constructing labyrinth seals.
  • an object of the present invention is to provide a sealing device capable of constructing a labyrinth seal with a simple structure.
  • a sealing device used for a bearing device including an outer ring member, an inner ring member and a rolling member.
  • the inner ring member has a flange portion facing the end face of the outer ring member.
  • the rolling member is provided between the outer ring member and the inner ring member.
  • the sealing device includes a cylindrical portion and a stretched portion.
  • the cylindrical portion is fixed to the inside of the outer ring member.
  • the extended portion extends from the end of the cylindrical portion to the outer side in the radial direction from the outer peripheral surface of the outer ring member.
  • the stretched portion has a contact surface that abuts on the end surface of the outer ring member.
  • a stepped portion having a plurality of surfaces is provided at a portion of the stretched portion facing the flange portion side.
  • the plurality of surfaces include a first surface separated by a first distance from the contact surface, and a second surface located radially outside the first surface. The second surface is separated from the contact surface by a second distance that exceeds the first distance.
  • a sealing device capable of constructing a labyrinth seal with a simple structure.
  • FIG. 1 is a cross-sectional view of the sealing device 1 in the present embodiment.
  • FIG. 1 shows an example of a state in which the sealing device 1 is mounted on the hub bearing 100.
  • FIG. 2 is an enlarged cross-sectional view of a main part of the sealing device 1.
  • the sealing device 1 is mounted on the hub bearing 100.
  • the hub bearing 100 is used as a bearing device that rotatably supports a rotating member such as a wheel in various industrial machines such as automobiles, construction machines, and agricultural machines.
  • the circumferential direction of a virtual circle having an arbitrary diameter centered on the central axis O of the sealing device 1 is referred to as "circumferential direction”
  • the radial direction of the virtual circle is referred to as "diameter direction”. Is written.
  • observing from a direction parallel to the central axis O is referred to as "planar view”
  • observing a cross section including the central axis O is referred to as "cross-sectional view”.
  • the hub bearing 100 has an outer ring member 101A and an inner ring member 102A.
  • the outer ring member 101A has a cylindrical outer ring main body 101.
  • the inner ring member 102A has an inner ring main body 102 and a flange portion 103.
  • the inner ring main body 102 is a cylindrical structure inserted into the outer ring main body 101 of the outer ring member 101A.
  • the flange portion 103 is provided on one end side of the inner ring main body 102.
  • the flange portion 103 is an annular portion protruding from the outer peripheral surface of the inner ring main body 102.
  • the outer ring member 101A is fixed to, for example, a suspension device (not shown) of an automobile.
  • the outer ring main body 101 of the outer ring member 101A surrounds at least a part of the inner ring main body 102 from the radial outside thereof.
  • the outer ring main body 101 and the inner ring main body 102 are arranged concentrically.
  • a plurality of rolling members 104 are provided between the outer ring member 101A (outer ring main body 101) and the inner ring member 102A (inner ring main body 102).
  • the rolling members 104 are arranged in the circumferential direction at intervals from each other. Each rolling member 104 is held via a cage (not shown).
  • the flange portion 103 extends radially outward from one end side of the inner ring main body 102, and is formed in a substantially annular shape in a plan view.
  • a wheel (not shown) of a wheel is attached to the flange portion 103.
  • a part of the flange back surface 103a of the flange portion 103 faces the end surface 101a of the outer ring member 101A (outer ring main body 101) with a gap.
  • the flange back surface 103a is a surface of the wheel opposite to the wheel (the surface on the left side in FIGS. 1 and 2).
  • the end face 101a is an end face on the flange portion 103 side of the outer ring main body 101.
  • the flange portion 103 faces the end surface 101a of the outer ring member 101A.
  • the base end portion of the flange portion 103 is formed in a curved surface shape so that the back surface 103a of the flange and the outer peripheral surface 102a of the inner ring main body 102 are smoothly continuous with each other.
  • the flange back surface 103a has a disk shape in a plan view. Further, the flange back surface 103a is formed in a stepped shape so that the distance from the end surface 101a of the outer ring member 101A increases stepwise toward the outside in the radial direction in a cross-sectional view.
  • the flange back surface 103a has an outer edge back surface 103a1, an intermediate back surface 103a2, and an inner edge back surface 103a3 in this order from the outer side in the radial direction.
  • the inner edge back surface portion 103a3 is located on the innermost side in the radial direction.
  • the inner edge back surface portion 103a3 is continuous from the base end portion of the flange portion 103 and extends in a direction orthogonal to the central axis O of the outer ring main body 101 and the inner ring main body 102.
  • the intermediate back surface portion 103a2 is continuous with the outer edge of the inner edge back surface portion 103a3 and further extends outward in the radial direction.
  • the outer edge back surface portion 103a1 is continuous with the outer edge of the intermediate back surface portion 103a2 and further extends outward in the radial direction.
  • the boundary between the inner edge back surface portion 103a3 and the intermediate back surface portion 103a2 is provided at a position corresponding to the end surface 101a of the outer ring member 101A on the flange back surface 103a in the radial direction.
  • the boundary between the intermediate back surface portion 103a2 and the outer edge back surface portion 103a1 is located on the outer side of the flange back surface 103a in the radial direction with respect to the outer peripheral surface 101c of the outer ring member 101A.
  • the intermediate back surface portion 103a2 is curved so as to be separated from the end surface 101a of the outer ring member 101A in the radial direction from the inner edge thereof, and further extends in parallel with the inner edge back surface portion 103a3 in the radial direction outward direction.
  • the outer edge back surface portion 103a1 is curved so as to be separated from the end surface 101a of the outer ring member 101A from the inner edge thereof to the outer side in the radial direction, and further extends in parallel with the intermediate back surface portion 103a2 in the radial outer direction.
  • the sealing device 1 is used for the hub bearing 100 and seals the grease filled between the outer ring main body 101 and the inner ring main body 102.
  • the sealing device 1 is mounted between a portion of the outer ring member 101A (specifically, the outer ring main body 101) on the inner peripheral surface 101b on the end surface 101a side and a portion of the inner ring main body 102 on the outer peripheral surface 102a on the flange portion 103 side. There is.
  • the sealing device 1 includes a reinforcing ring 10 and a sealing body 20.
  • the reinforcing ring 10 is a member that reinforces the seal body 20.
  • the seal body 20 extends substantially along the reinforcing ring 10 and is attached to the surface of the reinforcing ring 10 by, for example, adhesive.
  • the reinforcing ring 10 has a first cylindrical portion 11, a first disc portion 12, a second cylindrical portion 13, and a second disc portion 14.
  • the reinforcing ring 10 is made of, for example, a metal material, and is formed into an annular shape as a whole by press working.
  • a metal material a material selected from a plate-shaped material group such as stainless steel, SPCC and SPHC is used.
  • the first cylindrical portion 11 is formed in a cylindrical shape and is press-fitted inside a portion of the outer ring main body 101 on the end face 101a side. That is, the outer peripheral surface of the first cylindrical portion 11 and the inner peripheral surface 101b of the outer ring main body 101 are in close contact with each other.
  • the outer diameter of the first cylindrical portion 11 is set to be larger than the inner diameter of the outer ring main body 101 by the press-fitting allowance.
  • the first disk portion 12 is formed in a disk shape in a plan view. Specifically, the first disk portion 12 extends radially outward from the end portion (right end portion in the figure) of the first cylindrical portion 11 on the flange portion 103 side. The first disk portion 12 is continuous with the first cylindrical portion 11 and is located between the end surface 101a of the outer ring main body 101 and the flange back surface 103a of the flange portion 103. In the present embodiment, the first disk portion 12 extends from the end of the first cylindrical portion 11 to the outer side in the radial direction with respect to the outer peripheral surface 101c of the outer ring main body 101. That is, the outer peripheral portion of the first disk portion 12 protrudes slightly outward in the radial direction from the outer peripheral surface 101c of the outer ring main body 101.
  • the second cylindrical portion 13 is a cylindrical portion.
  • the second cylindrical portion 13 is formed concentrically with the first cylindrical portion 11 inward in the radial direction of the first cylindrical portion 11.
  • the second cylindrical portion 13 is continuous with the first cylindrical portion 11 and is formed in a shape folded back from the end portion (left end portion in the figure) opposite to the flange portion 103 in the first cylindrical portion 11. There is.
  • the second disk portion 14 is a disk-shaped portion in a plan view.
  • the second disk portion 14 extends radially inward from the end of the second cylindrical portion 13 opposite to the first cylindrical portion 11. That is, the second disk portion 14 is continuous with the second cylindrical portion 13.
  • the second disk portion 14 is located between the inner peripheral surface 101b of the outer ring main body 101 and the outer peripheral surface 102a of the inner ring main body 102.
  • the seal body 20 has an elastic cylindrical portion 21, a seal base portion 22, and a seal extending portion 23.
  • the seal body 20 is made of an elastic material.
  • the elastic material a material such as rubber or a thermoplastic elastomer is used.
  • the elastic cylindrical portion 21 is formed in a cylindrical shape and fills a gap between the first cylindrical portion 11 and the second cylindrical portion 13.
  • the portion including the first cylindrical portion 11 and the second cylindrical portion 13 of the reinforcing ring 10 and the elastic cylindrical portion 21 of the seal body 20 (hereinafter referred to as “cylindrical portion 1A”) is formed in a cylindrical shape as a whole.
  • the cylindrical portion 1A is fixed to the inside of the portion of the outer ring member 101A (outer ring main body 101) on the end face 101a side. That is, the cylindrical portion 1A is press-fitted into the outer ring main body 101.
  • the outer peripheral surface 11a of the first cylindrical portion 11 of the cylindrical portion 1A is in close contact with the inner peripheral surface 101b of the outer ring main body 101, so that the sealing device 1 is fixed to the outer ring member 101A of the hub bearing 100.
  • the cylindrical portion 1A in the present embodiment corresponds to the "cylindrical portion" according to the present invention.
  • the seal base 22 is formed in a disk shape in a plan view. Specifically, the seal base portion 22 extends inward in the radial direction from the end portion of the elastic cylindrical portion 21 on the flange portion 103 side. The seal base portion 22 extends along the surface of the second disk portion 14 of the reinforcing ring 10 on the flange portion 103 side. The inner peripheral portion of the seal base portion 22 slightly wraps around to the surface of the second disk portion 14 opposite to the flange portion 103.
  • the seal base 22 is formed with a grease lip portion 24, a side lip portion 25, and an intermediate lip portion 26.
  • the grease lip portion 24, the side lip portion 25, and the intermediate lip portion 26 may be collectively referred to as a “lip portion”.
  • the grease lip portion 24 extends from the inner peripheral portion of the seal base portion 22. Specifically, the base end portion of the grease lip portion 24 is connected to the inner peripheral portion of the seal base portion 22. The tip of the grease lip portion 24 is slidably in contact with the outer peripheral surface 102a of the inner ring main body 102. The tip end portion of the grease lip portion 24 is located at a position away from the flange back surface 103a from the base end portion of the grease lip portion 24 in the direction of the central axis O. That is, the grease lip portion 24 is formed in a tapered tubular shape whose diameter is reduced from the base end portion to the tip end portion. That is, the outer diameter at the tip of the grease lip portion 24 is smaller than the outer diameter at the base end portion of the grease lip portion 24.
  • the side lip portion 25 extends from the side surface 22a, which is the surface of the seal base portion 22 on the flange portion 103 side.
  • the base end portion of the side lip portion 25 is connected to the side surface 22a of the seal base portion 22.
  • the tip end portion of the side lip portion 25 slidably contacts the inner edge back surface portion 103a3 of the flange back surface 103a.
  • the side lip portion 25 is formed in a tapered tubular shape whose diameter increases from the base end portion to the tip end portion. That is, the outer diameter at the tip of the side lip portion 25 is larger than the outer diameter at the base end portion of the side lip portion 25.
  • the intermediate lip portion 26 extends from the end portion on the inner peripheral portion side of the side surface 22a of the seal base portion 22.
  • the intermediate lip portion 26 is located between the grease lip portion 24 and the side lip portion 25.
  • the base end portion of the intermediate lip portion 26 is connected to the side surface 22a of the seal base portion 22.
  • the tip of the intermediate lip portion 26 is slidably in contact with a curved surface portion of the base end portion of the flange portion 103 that is continuous with the inner ring main body 102.
  • the intermediate lip portion 26 is formed in a tapered tubular shape whose diameter increases from the base end portion to the tip end portion. That is, the outer diameter of the tip portion of the intermediate lip portion 26 is larger than the outer diameter of the base end portion of the intermediate lip portion 26.
  • the seal extending portion 23 extends radially outward from the end portion of the cylindrical portion 1A on the flange portion 103 side. Then, a part of the seal extending portion 23 is in contact with the end surface 101a of the outer ring main body 101. Specifically, the seal stretched portion 23 has a first stretched portion 23a, an extended portion 23b, and a second stretched portion 23c.
  • the first stretched portion 23a is formed in a disk shape in a plan view. Specifically, the first stretched portion 23a extends radially outward along the side surface 12a on the flange portion 103 side of the first disk portion 12 of the reinforcing ring 10.
  • the extension portion 23b is formed in a disk shape in a plan view like the first extension portion 23a. Specifically, the extension portion 23b extends further radially outward from the outer peripheral portion of the first extension portion 23a and covers the outer peripheral portion of the first disk portion 12 of the reinforcing ring 10.
  • the second extending portion 23c is a disk-shaped portion extending inward in the radial direction from the inner peripheral portion of the extending portion 23b. The second stretched portion 23c extends along the side surface 12b of the first disk portion 12 of the reinforcing ring 10 opposite to the side surface 12a. The second stretched portion 23c covers the side surface 12b.
  • the first disk portion 12 of the reinforcing ring 10 and the seal extending portion 23 of the seal main body 20 form the extending portion 1B.
  • the stretched portion 1B extends from the end of the cylindrical portion 1A to the outer side in the radial direction from the outer peripheral surface 101c of the outer ring member 101A (outer ring main body 101). That is, the outer peripheral portion (specifically, the extension portion 23b) of the stretched portion 1B protrudes radially outward from the outer peripheral surface 101c of the outer ring main body 101. Further, the stretched portion 1B has a contact surface 1B1 that abuts on the end surface 101a of the outer ring member 101A.
  • the extension portion 23b has a function of limiting the path by which foreign matter such as rainwater, muddy water, or dust reaches the gap between the first surface 271 and the flange portion 103, which will be described later.
  • the stretched portion 1B composed of the first disk portion 12 and the seal stretched portion 23 corresponds to the “stretched portion” according to the present invention.
  • each lip portion (24, 25, 26) of the sealing device 1 has a function of preventing or suppressing grease from leaking from the internal space S1 to the outside, and foreign matter such as dust, rainwater or muddy water invades the internal space S1 from the outside. It has a function to prevent or suppress this.
  • the flange back surface 103a of the flange portion 103 is formed in a stepped shape in a cross-sectional view. Focusing on the relationship with the end surface 101a of the outer ring member 101A, the flange back surface 103a is formed in a stepped shape so as to be gradually separated from the end surface 101a of the outer ring member 101A in the direction of the central axis O toward the outer side in the radial direction.
  • the side surface of the stretched portion 1B of the sealing device 1 on the flange portion 103 side is also cross-sectionally viewed as described in detail below. It is formed in a staircase pattern.
  • FIG. 2 is an enlarged cross-sectional view of a main part of the sealing device 1.
  • a step portion 27 is provided on the surface of the stretched portion 1B of the sealing device 1 on the flange portion 103 side.
  • the step portion 27 has a plurality of surfaces 27a that are gradually separated from the contact surface 1B1 (in other words, the end surface 101a of the outer ring member 101A) toward the outer side in the radial direction.
  • the entire side surface of the stretched portion 1B on the flange portion 103 side constitutes the step portion 27.
  • a case where the step portion 27 has two steps is illustrated.
  • the number of steps (in other words, the number of steps) in the step portion 27 is not particularly limited.
  • the number of steps in the step portion 27 is set according to, for example, the shape of the flange back surface 103a in the flange portion 103 of the hub bearing 100 (bearing device). For example, when three or more steps are required on the step portion 27, four or more surfaces 27a may be provided.
  • the “step” means a portion (site) in the step portion 27 where the height (distance) in the direction of the central axis O with respect to the contact surface 1B1 suddenly changes.
  • the stepped portion 27 has a first surface 271, a second surface 272, and a third surface 273 in order from the outside in the radial direction as a plurality of surfaces 27a.
  • the first surface 271, the second surface 272, and the third surface 273 are formed of an annular flat surface (a plane perpendicular to the central axis O) extending in a direction orthogonal to the central axis O of the outer ring main body 101 and the inner ring main body 102, respectively.
  • the plurality of surfaces 27a are the outermost first surface 271 in the radial direction, the second surface 272 radially inner than the first surface 271, and the third surface 273 radially inner than the second surface 272. Includes.
  • each surface 27a (271,272,273) of the stepped portion 27 with respect to the contact surface 1B1 is the third surface 273 and the second surface 272.
  • the first surface 271 is higher in this order. That is, the distance between the contact surface 1B1 and the first surface 271 is larger than the distance between the contact surface 1B1 and the second surface 272, and the distance between the contact surface 1B1 and the second surface 272 is the contact surface 1B1. Is greater than the distance between and the third surface 273. That is, the step portion 27 is formed in a stepped shape that goes up toward the outside in the radial direction or goes down toward the inside in the radial direction.
  • the second surface 272 or the third surface 273 corresponds to the "first surface” according to the present invention.
  • the first surface 271 corresponds to the "second surface” according to the present invention
  • the third surface 273 is the "first surface”
  • the first surface 271 is the "outermost surface in the radial direction among the plurality of surfaces” according to the present invention
  • the third surface 273 is the "diameter direction among the plurality of surfaces” according to the present invention. Corresponds to the "innermost surface”.
  • the stepped portion 27 includes a first inclined surface 274 and a second inclined surface 275 in addition to the first surface 271, the second surface 272, and the third surface 273.
  • the first inclined surface 274 is a surface connecting between the inner edge of the first surface 271 and the outer edge of the second surface 272.
  • the first inclined surface 274 is inclined with respect to the first surface 271 and the second surface 272.
  • the second inclined surface 275 is a surface connecting between the inner edge of the second surface 272 and the outer edge of the third surface 273.
  • the second inclined surface 275 is inclined with respect to the second surface 272 and the third surface 273.
  • the first inclined surface 274 and the second inclined surface 275 are inclined so as to reduce the diameter toward the contact surface 1B1 side, respectively. That is, the inner diameter of the first inclined surface 274 near the contact surface 1B1 is smaller than the inner diameter of the first inclined surface 274 near the flange 103. Similarly, the inner diameter of the second inclined surface 275 near the contact surface 1B1 is smaller than the inner diameter of the second inclined surface 275 near the flange 103.
  • the step portion 27 includes the first corner portion 276 and the second corner portion 277.
  • the first corner portion 276 is a portion where the first surface 271 and the first inclined surface 274 intersect.
  • the second corner portion 277 is a portion where the second surface 272 and the second inclined surface 275 intersect.
  • the first corner portion 276 and the second corner portion 277 are each formed into a smooth R shape.
  • a step is formed between the portion of the first inclined surface 274 and the portion of the second inclined surface 275 in the step portion 27.
  • the thickness of the outer portion 1B2 of the stretched portion 1B including the outer edge portion of the stretched portion 1B is set smaller than the thickness of the inner portion 1B3 of the stretched portion 1B including the contact surface 1B1.
  • the outer portion 1B2 is a portion on the distal end side of the extension portion 23b.
  • the inner portion 1B3 is a portion of the extension portion 23b on the proximal end side.
  • the thickness of each of the outer portion 1B2 and the inner portion 1B3 means the plate thickness in the direction of the central axis O.
  • a notch 23b1 recessed inward in the radial direction from the outer peripheral surface is formed on the surface of the extension portion 23b of the extension portion 1B on the contact surface 1B1 side.
  • the thickness of the outer portion 1B2 in the stretched portion 1B is smaller (thinner) than the thickness of the portion including the base end portion of the extension portion 23b, the second stretched portion 23c, and the first disk portion 12 of the reinforcing ring 10. ).
  • the inner edge of the first surface 271 (in other words, the first corner portion 276) of the plurality of surfaces 27a is located at the outer portion 1B2. Further, the inner edge (first corner portion 276) of the first surface 271 is a portion (outer edge back portion 103a1) of the flange portion 103 that is radially outer from the boundary (corner portion) between the outer edge back portion 103a1 and the intermediate back surface portion 103a2. Of these, a portion extending in a direction substantially orthogonal to the central axis O). That is, the inner edge (first corner portion 276) of the first surface 271 faces the portion on the inner edge side of the outer edge back surface portion 103a1. In other words, the inner edge of the first surface 271 and the outer edge back surface 103a1 overlap in a plan view.
  • the inner edge of the second surface 272 (in other words, the second corner portion 277) of the plurality of surfaces 27a is located radially inside the outer portion 1B2. Specifically, the inner edge (second corner portion 277) of the second surface 272 is located radially inside the outer portion 1B2 and radially outside the outer ring member 101A from the outer peripheral surface 101c. Further, the inner edge (second corner portion 277) of the second surface 272 faces a portion of the intermediate back surface portion 103a2 of the flange portion 103 that extends in a direction substantially orthogonal to the central axis O. In other words, the inner edge (second corner portion 277) of the second surface 272 faces the portion of the intermediate back surface portion 103a2 close to the outer edge. In other words, the inner edge of the second surface 272 and the intermediate back surface portion 103a2 overlap in a plan view.
  • the radial length of the range in which the second surface 272 and the intermediate back surface portion 103a2 face each other is the radial length in the range in which the first surface 271 and the outer edge back surface portion 103a1 face each other, and the third surface. It is longer than the length in the radial direction in the range where the 273 and the inner edge back surface 103a3 face each other.
  • the inner edge of the third surface 273 of the plurality of surfaces 27a is located at a position corresponding to the end surface 101a of the outer ring member 101A in the stretched portion 1B in the radial direction. Specifically, the inner edge of the third surface 273 overlaps the end surface 101a in a plan view. Further, the inner edge of the third surface 273 is a portion of the flange portion 103 that is radially inside from the boundary (corner portion) between the inner edge back portion 103a3 and the intermediate back portion 103a2 (of the inner edge back portion 103a3, orthogonal to the central axis O).
  • the inner edge of the third surface 273 faces a portion near the outer edge of the inner edge back surface portion 103a3.
  • the inner edge of the third surface 273 and the inner edge back surface portion 103a3 overlap in a plan view.
  • a gap is provided between the plurality of surfaces 27a and the flange portion 103, respectively.
  • a gap is formed between the first surface 271 and the outer edge back surface 103a1, between the second surface 272 and the intermediate back surface 103a2, and the third surface 273.
  • a gap is formed between the inner edge and the back surface portion 103a3, respectively.
  • the gap between the first surface 271 and the flange portion 103 (outer edge back portion 103a1) is larger than the gap between the second surface 272 and the flange portion 103 (intermediate back surface portion 103a2). Further, the gap between the second surface 272 and the flange portion 103 is larger than the gap between the third surface 273 and the flange portion 103 (inner edge back surface portion 103a3), for example.
  • the gap between the stepped portion 27 and the flange back surface 103a is gradually increased toward the outer side in the radial direction. Become.
  • the first surface 271 constitutes a labyrinth seal on the outer edge side in cooperation with the outer edge back surface portion 103a1.
  • a fluid such as rainwater or muddy water (hereinafter referred to as "external liquid”) passes through the gap between the first surface 271 and the flange back surface 103a, and the second surface 272 and the flange back surface 103a. It has a function of suppressing or preventing inflow into the area between.
  • the second surface 272 forms an intermediate labyrinth seal in cooperation with the intermediate back surface portion 103a2 on the inner side in the radial direction from the labyrinth seal on the outer edge side.
  • the intermediate labyrinth seal has a function of suppressing or preventing the external liquid that has passed through the labyrinth seal on the outer edge side from flowing into the region between the third surface 273 and the flange back surface 103a.
  • the third surface 273 constitutes the labyrinth seal on the inner edge side in cooperation with the inner edge back surface portion 103a3 on the inner side in the radial direction from the intermediate labyrinth seal.
  • the labyrinth seal on the inner edge side has a function of suppressing or preventing the external liquid that has passed through the intermediate labyrinth seal from flowing into the region between the seal base 22 of the seal body 20 and the flange back surface 103a.
  • the labyrinth seal is a non-contact seal formed by the unevenness between two opposing members.
  • the radial length of the intermediate labyrinth seal is longer than the radial length of the outer labyrinth seal.
  • the length of the intermediate labyrinth seal in the radial direction is the length in the radial direction in the range where the second surface 272 and the intermediate back surface portion 103a2 overlap in a plan view.
  • the radial length of the labyrinth seal on the outer edge side is the radial length of the range in which the first surface 271 and the outer edge back surface portion 103a1 overlap in a plan view.
  • the radial length of the intermediate labyrinth seal is longer than the radial length of the labyrinth seal on the inner edge side.
  • the radial length of the labyrinth seal on the inner edge side is the radial length of the range in which the third surface 273 and the inner edge back surface portion 103a3 overlap in a plan view.
  • the sealing action and the discharging action of the sealing device 1 with respect to the external liquid M such as rainwater or muddy water will be described with reference to FIG.
  • the upper side of the paper surface is the upper side in the vertical direction
  • the lower side of the paper surface is the lower side in the vertical direction.
  • External liquid M scattered from the ground by the wheels may adhere to the hub bearing 100. Then, for example, around the upper region of the flange portion 103 in the vertical direction, the external liquid M may scatter from the periphery of the outer ring main body 101 toward the flange back surface 103a of the flange portion 103. In this case, a part of the external liquid M toward the back surface 103a of the flange collides with the notch 23b1 in the extension 23b of the extension 1B. That is, the extension portion 23b functions as a splash guard (weir portion) that obstructs the path for the external liquid M to reach the gap between the step portion 27 and the flange back surface 103a.
  • the extension portion 23b functions as a splash guard (weir portion) that obstructs the path for the external liquid M to reach the gap between the step portion 27 and the flange back surface 103a.
  • the outer portion 1B2 of the stretched portion 1B elastically bends toward the flange portion 103 side, as shown in FIG.
  • the gap between the first surface 271 of the step portion 27 and the flange back surface 103a is narrowed as compared with that before the elastic deformation of the outer portion 1B2.
  • a part of the external liquid M toward the back surface 103a of the flange may exceed the outer edge portion (upper end portion in FIG. 3) of the extension portion 23b of the extension portion 1B.
  • a plurality of labyrinth seals composed of the step portion 27 and the flange back surface 103a are formed. Therefore, the inflow of the external liquid M into the internal space S1 of the hub bearing 100 is suppressed or prevented.
  • the external liquid M may not collide with the notch 23b1. Further, since the collision of the external liquid M with the notch portion 23b1 is gentle, the elastic deformation of the outer portion 1B2 of the stretched portion 1B may be slight. In these cases, the gap between the first surface 271 and the flange back surface 103a is maintained in a large state with respect to the gap in other portions. Therefore, it is assumed that a part of the external liquid M reaches the gap between the first surface 271 and the outer edge back surface portion 103a1 from the upper side in the vertical direction and passes through this gap.
  • the intermediate labyrinth seal composed of the second surface 272 and the intermediate back surface portion 103a2 suppresses or prevents the inflow of the external liquid M between the third surface 273 and the intermediate back surface portion 103a2.
  • the labyrinth seal on the inner edge side composed of the third surface 273 and the inner edge back surface 103a3 allows the external liquid M to flow into the region between the seal base 22 and the inner edge back surface 103a3 of the seal body 20. Suppressed or prevented. As a result, the inflow of the external liquid M into the internal space S1 of the hub bearing 100 is suppressed or prevented.
  • the external liquid M that has flowed down in the vertical direction goes to the outside (below the sealing device 1) through the gap between the first surface 271 and the outer edge back surface 103a1 that is maintained in a relatively large gap. It is discharged promptly.
  • the stepped portion 27 on the flange portion 103 side of the stretched portion 1B has a plurality of surfaces whose distance from the end surface 101a of the outer ring member 101A gradually increases toward the outer side in the radial direction. 27a is formed. That is, the step portion 27 is formed in a stepped shape in a cross-sectional view. Further, the flange back surface 103a of the flange portion 103 of the hub bearing 100 is also formed in a stepped shape in a cross-sectional view.
  • the stepped portion 27 is formed in a stepped shape so as to correspond to the shape of the flange back surface 103a, and the stepped portion 27 and the flange back surface 103a form a plurality of labyrinth seals.
  • a sealing device 1 capable of constructing a labyrinth seal with a simple structure.
  • step portion 27 of the extension portion 1B is not in contact with the flange back surface 103a of the flange portion 103, an increase in rotational torque in the hub bearing 100 can be suppressed. As a result, the rotational torque of the hub bearing 100 is reduced, and the sealing property against foreign matter such as the external liquid M is improved. Further, since the plurality of labyrinth seals are provided concentrically and in multiple stages, the sealing property against foreign matter such as the external liquid M can be more effectively improved.
  • the thickness of the outer portion 1B2 of the stretched portion 1B is smaller than the thickness of the inner portion 1B3 of the stretched portion 1B. Therefore, the rigidity of the tip portion of the extension portion 23b of the extension portion 1B is lower than the rigidity of the base end portion of the extension portion 23b. As a result, when the external liquid M collides with the extension portion 23b of the extension portion 1B, the gap between the first surface 271 and the flange back surface 103a becomes narrow as described above. As a result, the labyrinth seal on the outer edge side composed of the first surface 271 and the flange back surface 103a exerts its sealing function more effectively.
  • the inner edge (first corner portion 276) of the first surface 271 of the step portion 27 is located at the outer portion 1B2, and the inner edge (second corner portion 277) of the second surface 272 is in the radial direction from the outer portion 1B2. It is located inside. Therefore, the second surface 272 is generally formed at a portion of the stretched portion 1B having a relatively high rigidity. As a result, even if the external liquid M vigorously collides with the stretched portion 1B, the gap between the second surface 272 and the flange back surface 103a can be substantially maintained at the design value.
  • the intermediate labyrinth seal composed of the second surface 272 and the flange back surface 103a effectively exerts the intended sealing function regardless of the presence or absence of collision of the external liquid M.
  • the labyrinth seal on the inner edge side composed of the third surface 273 and the flange back surface 103a effectively exerts the intended sealing function regardless of the presence or absence of collision of the external liquid M.
  • the gap between the first surface 271 and the flange portion 103 (flange back surface 103a) is the third surface 273 and the flange portion 103 (flange back surface 103a). ) Is larger than the gap between them. Therefore, in anticipation of the amount of elastic deformation of the stretched portion 1B due to the collision of the external liquid M, the gap between the first surface 271 and the flange back surface 103a is secured larger than the gap between the third surface 273 and the flange back surface 103a.
  • the gap between the first surface 271 and the flange back surface 103a is maintained wide.
  • the external liquid M that has passed through the gap between the first surface 271 and the flange back surface 103a from above in the vertical direction passes through the gap between the first surface 271 and the flange back surface 103a on the lower side in the vertical direction. It is quickly discharged to the outside (below the sealing device 1). Thereby, the discharge property of the external liquid M can be improved.
  • the inner edge (second corner portion 277) of the second surface 272 is also located radially outside the outer peripheral surface 101c of the outer ring member 101A.
  • the labyrinth seal on the outer edge side and the labyrinth seal in the middle are located far outward in the radial direction from the internal space S1 of the hub bearing 100.
  • the hermeticity with respect to the internal space S1 can be improved.
  • Each surface 27a of the step portion 27 extends in a direction orthogonal to the central axis O, but is not limited to this, and may be slightly inclined with respect to the central axis O, for example. Further, between two surfaces 27a adjacent to each other (for example, the first surface 271 and the second surface 272, the second surface 272 and the third surface 273), a surface inclined with respect to the central axis O (first inclined surface). 274, second inclined surface 275), but is not limited to this. Two surfaces 27a adjacent to each other may be connected by a surface extending parallel to the central axis O.
  • the entire side surface of the stretched portion 1B on the flange portion 103 side constitutes the step portion 27, and the entire side surface is formed in a stepped shape.
  • the step portion 27 may be formed only in the portion of the stretched portion 1B having a predetermined width in the radial direction.
  • the sealing device 1 is assumed to have the reinforcing ring 10, but the present invention is not limited to this, and the reinforcing ring 10 may not be provided.
  • the portion corresponding to the reinforcing ring 10 can be formed integrally with the seal body 20 by, for example, a member made of the same material as the seal body 20.
  • the bearing device to which the sealing device 1 is mounted is not limited to the hub bearing 100.
  • the sealing device 1 is attached to a bearing device having an arbitrary structure including an outer ring member, an inner ring member having a flange portion facing the end surface of the outer ring member, and a rolling member provided between the outer ring member and the inner ring member. It will be used.

Abstract

This sealing device is used in a hub bearing having an outer race member, an inner race member, and rolling elements. The inner race member has a flange section opposing an end surface of the outer race member. The sealing device includes a cylindrical section and an extending section. The cylindrical section is secured to the inner side of the outer race member. The extending section extends outward in the radial direction past the outer peripheral surface of the outer race member from an end of the cylindrical section, and has a contact surface that comes into contact with an end surface of the outer race member. A level-difference section having a plurality of surfaces is formed in the flange-section side of the inner race member in the extending section. Progressively outward in the radial direction, the plurality of surfaces are separated farther in incremental steps from the end surface of the outer race member.

Description

密封装置Sealing device
　本発明は、軸受装置に用いられる密封装置に関する。 The present invention relates to a sealing device used in a bearing device.
　特許文献１は、自動車の車輪を回転自在に支持する軸受装置に装着される密封装置を開示している。この軸受装置は、いわゆるハブベアリングであり、外輪と内輪とを有している。内輪にはフランジ部が形成されている。この軸受装置の外輪と内輪との間に、密封装置が設けられている。密封装置は、金属製の補強環と、補強環と一体的に成形されるシール本体とを有している。補強環は、筒部と外径フランジ部とを含む。筒部は、外輪のうち内輪のフランジ部に近い部位の内側に圧入される。外径フランジ部は、補強環の筒部の一端部から径方向外方に延びる。シール本体は、ダスト用リップと、グリース用リップと、被覆層とを有している。被覆層は、外径フランジ部を被覆する。 Patent Document 1 discloses a sealing device mounted on a bearing device that rotatably supports wheels of an automobile. This bearing device is a so-called hub bearing and has an outer ring and an inner ring. A flange portion is formed on the inner ring. A sealing device is provided between the outer ring and the inner ring of this bearing device. The sealing device has a metal reinforcing ring and a sealing body integrally formed with the reinforcing ring. The reinforcing ring includes a tubular portion and an outer diameter flange portion. The tubular portion is press-fitted into the inner part of the outer ring near the flange portion of the inner ring. The outer diameter flange portion extends radially outward from one end of the tubular portion of the reinforcing ring. The seal body has a dust lip, a grease lip, and a coating layer. The coating layer covers the outer diameter flange portion.
　被覆層と内輪のフランジ部との間には隙間が形成されている。被覆層は、テーパー筒状のラビリンスリップを有する。ラビリンスリップは、フランジ部に向かって延びる。ダスト用リップ及びグリース用リップの先端は内輪に接触する。他方、ラビリンスリップの先端は、内輪のフランジ部との間に僅かな隙間をあけて対向する。すなわち、ラビリンスリップの先端は、内輪のフランジ部に接触していない。 A gap is formed between the coating layer and the flange of the inner ring. The coating layer has a tapered tubular labyrinth slip. The labyrinth slip extends toward the flange. The tips of the dust lip and the grease lip come into contact with the inner ring. On the other hand, the tip of the labyrinth slip faces the flange portion of the inner ring with a slight gap. That is, the tip of the labyrinth slip is not in contact with the flange portion of the inner ring.
国際公開第２０１５／０７２１７０号International Publication No. 2015/072170
　ところで、前述の密封装置では、ラビリンスリップの先端と内輪のフランジ部との間の僅かな隙間によって、ラビリンスシールが構成されている。このラビリンスシールによって、外部から軸受装置の内部空間への異物（例えば雨水、泥水又は埃）の流入に対する一定程度の密封性を確保することが可能である。この種の密封装置では、ラビリンスシールを構築するための構造の簡素化が求められ得る。 By the way, in the above-mentioned sealing device, the labyrinth seal is formed by a slight gap between the tip of the labyrinth slip and the flange portion of the inner ring. With this labyrinth seal, it is possible to secure a certain degree of sealing property against the inflow of foreign matter (for example, rainwater, muddy water or dust) from the outside into the internal space of the bearing device. This type of sealing device may require structural simplification for constructing labyrinth seals.
　そこで、本発明は、簡素な構造でラビリンスシールを構築することが可能な密封装置を提供することを目的とする。 Therefore, an object of the present invention is to provide a sealing device capable of constructing a labyrinth seal with a simple structure.
　本発明の一側面によると、外輪部材と内輪部材と転動部材とを含む軸受装置に用いられる密閉装置が提供される。内輪部材は、外輪部材の端面に相対するフランジ部を有する。転動部材は、外輪部材と内輪部材との間に設けられる。密封装置は、円筒部と延伸部とを含む。円筒部は、外輪部材の内側に固定される。延伸部は、円筒部の端部から外輪部材の外周面より径方向外側まで延びている。そして、延伸部は、外輪部材の端面に当接する当接面を有している。延伸部のうちフランジ部側に相対する部位には、複数の面を有する段差部が設けられている。複数の面は、当接面に対して第１距離だけ離れた第１面と、当該第１面よりも径方向外側に位置する第２面とを含む。第２面は、当接面に対して第１距離を上回る第２距離だけ離れている。 According to one aspect of the present invention, there is provided a sealing device used for a bearing device including an outer ring member, an inner ring member and a rolling member. The inner ring member has a flange portion facing the end face of the outer ring member. The rolling member is provided between the outer ring member and the inner ring member. The sealing device includes a cylindrical portion and a stretched portion. The cylindrical portion is fixed to the inside of the outer ring member. The extended portion extends from the end of the cylindrical portion to the outer side in the radial direction from the outer peripheral surface of the outer ring member. The stretched portion has a contact surface that abuts on the end surface of the outer ring member. A stepped portion having a plurality of surfaces is provided at a portion of the stretched portion facing the flange portion side. The plurality of surfaces include a first surface separated by a first distance from the contact surface, and a second surface located radially outside the first surface. The second surface is separated from the contact surface by a second distance that exceeds the first distance.
　本発明の一側面によれば、簡素な構造でラビリンスシールを構築することが可能な密封装置を提供できる。 According to one aspect of the present invention, it is possible to provide a sealing device capable of constructing a labyrinth seal with a simple structure.
本発明の一実施形態における密封装置の断面図である。It is sectional drawing of the sealing device in one Embodiment of this invention. 上記密封装置の要部を拡大した断面図である。It is an enlarged cross-sectional view of the main part of the sealing device. 上記密封装置における密封作用及び排出作用を説明するための概念図である。It is a conceptual diagram for demonstrating the sealing action and the discharging action in the said sealing apparatus.
　以下、本発明の実施形態を添付図面に基づいて説明する。
　図１は本実施形態における密封装置１の断面図である。図１には密封装置１がハブベアリング１００に装着された状態の一例が示されている。図２は密封装置１の要部を拡大した断面図である。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of the sealing device 1 in the present embodiment. FIG. 1 shows an example of a state in which the sealing device 1 is mounted on the hub bearing 100. FIG. 2 is an enlarged cross-sectional view of a main part of the sealing device 1.
　[密封装置の装着対象]
　密封装置１は、ハブベアリング１００に装着される。ハブベアリング１００は、自動車、建築機械又は農業機械といった様々な産業機械において、車輪などの回転部材を回転可能に支持する軸受装置として用いられる。なお、以下の説明においては、密封装置１の中心軸Ｏを中心とする任意の直径の仮想円における円周の方向を「周方向」と表記し、当該仮想円の半径の方向を「径方向」と表記する。また、中心軸Ｏに平行な方向から観察することを「平面視」と表記し、中心軸Ｏを含む断面を観察することを「断面視」と表記する。 [Target for sealing device]
The sealing device 1 is mounted on the hub bearing 100. The hub bearing 100 is used as a bearing device that rotatably supports a rotating member such as a wheel in various industrial machines such as automobiles, construction machines, and agricultural machines. In the following description, the circumferential direction of a virtual circle having an arbitrary diameter centered on the central axis O of the sealing device 1 is referred to as "circumferential direction", and the radial direction of the virtual circle is referred to as "diameter direction". Is written. Further, observing from a direction parallel to the central axis O is referred to as "planar view", and observing a cross section including the central axis O is referred to as "cross-sectional view".
　ハブベアリング１００は、外輪部材１０１Ａと内輪部材１０２Ａとを有している。外輪部材１０１Ａは、円筒状の外輪本体１０１を有している。内輪部材１０２Ａは、内輪本体１０２と、フランジ部１０３とを有している。内輪本体１０２は、外輪部材１０１Ａの外輪本体１０１内に挿入される円筒状の構造体である。フランジ部１０３は、内輪本体１０２の一端側に設けられている。フランジ部１０３は、内輪本体１０２の外周面から突出する円環状の部分である。 The hub bearing 100 has an outer ring member 101A and an inner ring member 102A. The outer ring member 101A has a cylindrical outer ring main body 101. The inner ring member 102A has an inner ring main body 102 and a flange portion 103. The inner ring main body 102 is a cylindrical structure inserted into the outer ring main body 101 of the outer ring member 101A. The flange portion 103 is provided on one end side of the inner ring main body 102. The flange portion 103 is an annular portion protruding from the outer peripheral surface of the inner ring main body 102.
　外輪部材１０１Ａは、例えば自動車の懸架装置（図示省略）に固定される。外輪部材１０１Ａの外輪本体１０１は、内輪本体１０２の少なくとも一部をその径方向外側から包囲する。外輪本体１０１と内輪本体１０２とは、同心的に配置されている。外輪部材１０１Ａ（外輪本体１０１）と内輪部材１０２Ａ（内輪本体１０２）との間には、複数の転動部材１０４が設けられている。各転動部材１０４は、相互に間隔をあけて周方向に配置される。各転動部材１０４は、保持器（図示省略）を介して保持されている。 The outer ring member 101A is fixed to, for example, a suspension device (not shown) of an automobile. The outer ring main body 101 of the outer ring member 101A surrounds at least a part of the inner ring main body 102 from the radial outside thereof. The outer ring main body 101 and the inner ring main body 102 are arranged concentrically. A plurality of rolling members 104 are provided between the outer ring member 101A (outer ring main body 101) and the inner ring member 102A (inner ring main body 102). The rolling members 104 are arranged in the circumferential direction at intervals from each other. Each rolling member 104 is held via a cage (not shown).
　フランジ部１０３は、内輪本体１０２の一端側から径方向外方に延びており、平面視で概ね円環状に形成されている。このフランジ部１０３には、車輪のホイール（図示省略）が取り付けられる。フランジ部１０３におけるフランジ背面１０３ａの一部は、外輪部材１０１Ａ（外輪本体１０１）における端面１０１ａに対して隙間をあけて相対している。フランジ背面１０３ａは、車輪のホイールと反対側の面（図１及び図２では左側の面）である。端面１０１ａは、外輪本体１０１におけるフランジ部１０３側の端面である。以上の例示の通り、フランジ部１０３は、外輪部材１０１Ａの端面１０１ａに相対している。 The flange portion 103 extends radially outward from one end side of the inner ring main body 102, and is formed in a substantially annular shape in a plan view. A wheel (not shown) of a wheel is attached to the flange portion 103. A part of the flange back surface 103a of the flange portion 103 faces the end surface 101a of the outer ring member 101A (outer ring main body 101) with a gap. The flange back surface 103a is a surface of the wheel opposite to the wheel (the surface on the left side in FIGS. 1 and 2). The end face 101a is an end face on the flange portion 103 side of the outer ring main body 101. As described above, the flange portion 103 faces the end surface 101a of the outer ring member 101A.
　本実施形態では、フランジ部１０３の基端部は、フランジ背面１０３ａと内輪本体１０２の外周面１０２ａとが互いに滑らかに連続するように曲面状に形成されている。フランジ背面１０３ａは、平面視では円盤状である。また、フランジ背面１０３ａは、断面視において、外輪部材１０１Ａの端面１０１ａとの距離が径方向外側に向けて段階的に大きくなるように階段状に形成されている。 In the present embodiment, the base end portion of the flange portion 103 is formed in a curved surface shape so that the back surface 103a of the flange and the outer peripheral surface 102a of the inner ring main body 102 are smoothly continuous with each other. The flange back surface 103a has a disk shape in a plan view. Further, the flange back surface 103a is formed in a stepped shape so that the distance from the end surface 101a of the outer ring member 101A increases stepwise toward the outside in the radial direction in a cross-sectional view.
　本実施形態では、フランジ背面１０３ａは、径方向外側から順に外縁背面部１０３ａ１と中間背面部１０３ａ２と内縁背面部１０３ａ３とを有する。内縁背面部１０３ａ３は、径方向の最も内側に位置する。内縁背面部１０３ａ３は、フランジ部１０３の基端部から連続し、外輪本体１０１及び内輪本体１０２の中心軸Ｏと直交する方向に延びている。中間背面部１０３ａ２は、内縁背面部１０３ａ３の外縁に連続して更に径方向外方に延びている。外縁背面部１０３ａ１は、中間背面部１０３ａ２の外縁に連続して更に径方向外方に延びている。本実施形態では、内縁背面部１０３ａ３と中間背面部１０３ａ２との境界は、径方向において、フランジ背面１０３ａにおける外輪部材１０１Ａの端面１０１ａに対応する位置に設けられる。中間背面部１０３ａ２と外縁背面部１０３ａ１との境界は、フランジ背面１０３ａのうち、外輪部材１０１Ａの外周面１０１ｃよりも径方向外側に位置する。例えば、中間背面部１０３ａ２は、その内縁から径方向外方に向けて外輪部材１０１Ａの端面１０１ａから離れるように湾曲し、更に径方向外方においては、内縁背面部１０３ａ３と平行に延びている。外縁背面部１０３ａ１は、その内縁から径方向外方にかけて外輪部材１０１Ａの端面１０１ａから離れるように湾曲し、更に径方向外方においては、中間背面部１０３ａ２と平行に延びている。 In the present embodiment, the flange back surface 103a has an outer edge back surface 103a1, an intermediate back surface 103a2, and an inner edge back surface 103a3 in this order from the outer side in the radial direction. The inner edge back surface portion 103a3 is located on the innermost side in the radial direction. The inner edge back surface portion 103a3 is continuous from the base end portion of the flange portion 103 and extends in a direction orthogonal to the central axis O of the outer ring main body 101 and the inner ring main body 102. The intermediate back surface portion 103a2 is continuous with the outer edge of the inner edge back surface portion 103a3 and further extends outward in the radial direction. The outer edge back surface portion 103a1 is continuous with the outer edge of the intermediate back surface portion 103a2 and further extends outward in the radial direction. In the present embodiment, the boundary between the inner edge back surface portion 103a3 and the intermediate back surface portion 103a2 is provided at a position corresponding to the end surface 101a of the outer ring member 101A on the flange back surface 103a in the radial direction. The boundary between the intermediate back surface portion 103a2 and the outer edge back surface portion 103a1 is located on the outer side of the flange back surface 103a in the radial direction with respect to the outer peripheral surface 101c of the outer ring member 101A. For example, the intermediate back surface portion 103a2 is curved so as to be separated from the end surface 101a of the outer ring member 101A in the radial direction from the inner edge thereof, and further extends in parallel with the inner edge back surface portion 103a3 in the radial direction outward direction. The outer edge back surface portion 103a1 is curved so as to be separated from the end surface 101a of the outer ring member 101A from the inner edge thereof to the outer side in the radial direction, and further extends in parallel with the intermediate back surface portion 103a2 in the radial outer direction.
　[密封装置の概略構成]
　密封装置１は、ハブベアリング１００に用いられ、外輪本体１０１と内輪本体１０２との間に充填されるグリースを密封する。密封装置１は、外輪部材１０１Ａ（詳しくは、外輪本体１０１）の内周面１０１ｂにおける端面１０１ａ側の部位と、内輪本体１０２の外周面１０２ａにおけるフランジ部１０３側の部位との間に装着されている。 [Outline configuration of sealing device]
The sealing device 1 is used for the hub bearing 100 and seals the grease filled between the outer ring main body 101 and the inner ring main body 102. The sealing device 1 is mounted between a portion of the outer ring member 101A (specifically, the outer ring main body 101) on the inner peripheral surface 101b on the end surface 101a side and a portion of the inner ring main body 102 on the outer peripheral surface 102a on the flange portion 103 side. There is.
　密封装置１は、補強環１０とシール本体２０とを含む。補強環１０は、シール本体２０を補強する部材である。シール本体２０は、概ね補強環１０に沿って延び、補強環１０の表面に例えば接着により取り付けられている。 The sealing device 1 includes a reinforcing ring 10 and a sealing body 20. The reinforcing ring 10 is a member that reinforces the seal body 20. The seal body 20 extends substantially along the reinforcing ring 10 and is attached to the surface of the reinforcing ring 10 by, for example, adhesive.
　補強環１０は、第１円筒部１１と第１円盤部１２と第２円筒部１３と第２円盤部１４とを有する。補強環１０は、例えば、金属材からなり、プレス加工によって全体として環状に成形されている。金属材としては、ステンレス鋼、ＳＰＣＣ及びＳＰＨＣといった板状の材料群の中から選択された材料が用いられる。 The reinforcing ring 10 has a first cylindrical portion 11, a first disc portion 12, a second cylindrical portion 13, and a second disc portion 14. The reinforcing ring 10 is made of, for example, a metal material, and is formed into an annular shape as a whole by press working. As the metal material, a material selected from a plate-shaped material group such as stainless steel, SPCC and SPHC is used.
　第１円筒部１１は、円筒状に形成され、外輪本体１０１における端面１０１ａ側の部位の内側に圧入されている。すなわち、第１円筒部１１の外周面と外輪本体１０１の内周面１０１ｂとは互いに密着する。第１円筒部１１の外径は、外輪本体１０１の内径よりも圧入代分だけ大きく設定されている。 The first cylindrical portion 11 is formed in a cylindrical shape and is press-fitted inside a portion of the outer ring main body 101 on the end face 101a side. That is, the outer peripheral surface of the first cylindrical portion 11 and the inner peripheral surface 101b of the outer ring main body 101 are in close contact with each other. The outer diameter of the first cylindrical portion 11 is set to be larger than the inner diameter of the outer ring main body 101 by the press-fitting allowance.
　第１円盤部１２は、平面視で円盤状に形成されている。具体的には、第１円盤部１２は、第１円筒部１１におけるフランジ部１０３側の端部（図では右端部）から径方向外方に延びる。第１円盤部１２は、第１円筒部１１に連続し、外輪本体１０１の端面１０１ａとフランジ部１０３のフランジ背面１０３ａとの間に位置している。本実施形態では、第１円盤部１２は第１円筒部１１の端部から外輪本体１０１の外周面１０１ｃよりも径方向外側まで延びている。すなわち、第１円盤部１２の外周部は、外輪本体１０１の外周面１０１ｃより僅かに径方向外側に突出している。 The first disk portion 12 is formed in a disk shape in a plan view. Specifically, the first disk portion 12 extends radially outward from the end portion (right end portion in the figure) of the first cylindrical portion 11 on the flange portion 103 side. The first disk portion 12 is continuous with the first cylindrical portion 11 and is located between the end surface 101a of the outer ring main body 101 and the flange back surface 103a of the flange portion 103. In the present embodiment, the first disk portion 12 extends from the end of the first cylindrical portion 11 to the outer side in the radial direction with respect to the outer peripheral surface 101c of the outer ring main body 101. That is, the outer peripheral portion of the first disk portion 12 protrudes slightly outward in the radial direction from the outer peripheral surface 101c of the outer ring main body 101.
　第２円筒部１３は、円筒状の部分である。第２円筒部１３は、第１円筒部１１の径方向内方に、第１円筒部１１と同心的に形成されている。第２円筒部１３は、第１円筒部１１に連続しており、第１円筒部１１におけるフランジ部１０３と反対側の端部（図では左端部）から折り返えされた形状に形成されている。 The second cylindrical portion 13 is a cylindrical portion. The second cylindrical portion 13 is formed concentrically with the first cylindrical portion 11 inward in the radial direction of the first cylindrical portion 11. The second cylindrical portion 13 is continuous with the first cylindrical portion 11 and is formed in a shape folded back from the end portion (left end portion in the figure) opposite to the flange portion 103 in the first cylindrical portion 11. There is.
　第２円盤部１４は、平面視で円盤状の部分である。第２円盤部１４は、第２円筒部１３のうち第１円筒部１１とは反対側の端部から径方向内方に延びている。すなわち、第２円盤部１４は、第２円筒部１３に連続する。また、第２円盤部１４は、外輪本体１０１の内周面１０１ｂと内輪本体１０２の外周面１０２ａとの間に位置している。 The second disk portion 14 is a disk-shaped portion in a plan view. The second disk portion 14 extends radially inward from the end of the second cylindrical portion 13 opposite to the first cylindrical portion 11. That is, the second disk portion 14 is continuous with the second cylindrical portion 13. The second disk portion 14 is located between the inner peripheral surface 101b of the outer ring main body 101 and the outer peripheral surface 102a of the inner ring main body 102.
　シール本体２０は、弾性円筒部２１とシール基部２２とシール延伸部２３とを有する。シール本体２０は、弾性材から形成されている。弾性材としては、ゴム又は熱可塑性エラストマーといった材料が用いられている。 The seal body 20 has an elastic cylindrical portion 21, a seal base portion 22, and a seal extending portion 23. The seal body 20 is made of an elastic material. As the elastic material, a material such as rubber or a thermoplastic elastomer is used.
　弾性円筒部２１は、円筒状に形成され、第１円筒部１１と第２円筒部１３との間の隙間を埋めている。ここで、補強環１０の第１円筒部１１及び第２円筒部１３とシール本体２０の弾性円筒部２１とからなる部分（以下「円筒部１Ａ」という）は、全体として円筒状に形成されている。円筒部１Ａは、外輪部材１０１Ａ（外輪本体１０１）のうち端面１０１ａ側の部位の内側に固定されている。すなわち、円筒部１Ａが外輪本体１０１の内部に圧入される。密封装置１は、円筒部１Ａの第１円筒部１１の外周面１１ａが外輪本体１０１の内周面１０１ｂに密着することで、ハブベアリング１００の外輪部材１０１Ａに固定される。なお、本実施形態における円筒部１Ａは、本発明に係る「円筒部」に相当する。 The elastic cylindrical portion 21 is formed in a cylindrical shape and fills a gap between the first cylindrical portion 11 and the second cylindrical portion 13. Here, the portion including the first cylindrical portion 11 and the second cylindrical portion 13 of the reinforcing ring 10 and the elastic cylindrical portion 21 of the seal body 20 (hereinafter referred to as “cylindrical portion 1A”) is formed in a cylindrical shape as a whole. There is. The cylindrical portion 1A is fixed to the inside of the portion of the outer ring member 101A (outer ring main body 101) on the end face 101a side. That is, the cylindrical portion 1A is press-fitted into the outer ring main body 101. In the sealing device 1, the outer peripheral surface 11a of the first cylindrical portion 11 of the cylindrical portion 1A is in close contact with the inner peripheral surface 101b of the outer ring main body 101, so that the sealing device 1 is fixed to the outer ring member 101A of the hub bearing 100. The cylindrical portion 1A in the present embodiment corresponds to the "cylindrical portion" according to the present invention.
　シール基部２２は、平面視で円盤状に形成されている。具体的には、シール基部２２は、弾性円筒部２１におけるフランジ部１０３側の端部から径方向内方に延びている。シール基部２２は、補強環１０の第２円盤部１４のうちフランジ部１０３側の面に沿って延びている。シール基部２２の内周部は、第２円盤部１４におけるフランジ部１０３と反対側の面まで僅かに回り込んでいる。 The seal base 22 is formed in a disk shape in a plan view. Specifically, the seal base portion 22 extends inward in the radial direction from the end portion of the elastic cylindrical portion 21 on the flange portion 103 side. The seal base portion 22 extends along the surface of the second disk portion 14 of the reinforcing ring 10 on the flange portion 103 side. The inner peripheral portion of the seal base portion 22 slightly wraps around to the surface of the second disk portion 14 opposite to the flange portion 103.
　本実施形態では、シール基部２２には、グリースリップ部２４とサイドリップ部２５と中間リップ部２６とが形成されている。以下の説明においては、グリースリップ部２４とサイドリップ部２５と中間リップ部２６とを「リップ部」と総称する場合がある。 In the present embodiment, the seal base 22 is formed with a grease lip portion 24, a side lip portion 25, and an intermediate lip portion 26. In the following description, the grease lip portion 24, the side lip portion 25, and the intermediate lip portion 26 may be collectively referred to as a “lip portion”.
　グリースリップ部２４は、シール基部２２の内周部から延びている。具体的には、グリースリップ部２４の基端部は、シール基部２２の内周部に接続されている。グリースリップ部２４の先端部は、内輪本体１０２の外周面１０２ａに摺動自在に接触する。グリースリップ部２４の先端部は、中心軸Ｏの方向において、グリースリップ部２４の基端部よりもフランジ背面１０３ａから離れた位置にある。すなわち、グリースリップ部２４は、その基端部から先端部に向かって縮径するテーパー筒状に形成されている。すなわち、グリースリップ部２４の先端部における外径は、当該グリースリップ部２４の基端部における外径よりも小さい。 The grease lip portion 24 extends from the inner peripheral portion of the seal base portion 22. Specifically, the base end portion of the grease lip portion 24 is connected to the inner peripheral portion of the seal base portion 22. The tip of the grease lip portion 24 is slidably in contact with the outer peripheral surface 102a of the inner ring main body 102. The tip end portion of the grease lip portion 24 is located at a position away from the flange back surface 103a from the base end portion of the grease lip portion 24 in the direction of the central axis O. That is, the grease lip portion 24 is formed in a tapered tubular shape whose diameter is reduced from the base end portion to the tip end portion. That is, the outer diameter at the tip of the grease lip portion 24 is smaller than the outer diameter at the base end portion of the grease lip portion 24.
　サイドリップ部２５は、シール基部２２におけるフランジ部１０３側の面である側面２２ａから延びている。サイドリップ部２５の基端部は、シール基部２２の側面２２ａに接続されている。サイドリップ部２５の先端部は、フランジ背面１０３ａの内縁背面部１０３ａ３に摺動自在に接触する。サイドリップ部２５は、その基端部から先端部に向かって拡径するテーパー筒状に形成されている。すなわち、サイドリップ部２５の先端部における外径は、当該サイドリップ部２５の基端部における外径よりも大きい。 The side lip portion 25 extends from the side surface 22a, which is the surface of the seal base portion 22 on the flange portion 103 side. The base end portion of the side lip portion 25 is connected to the side surface 22a of the seal base portion 22. The tip end portion of the side lip portion 25 slidably contacts the inner edge back surface portion 103a3 of the flange back surface 103a. The side lip portion 25 is formed in a tapered tubular shape whose diameter increases from the base end portion to the tip end portion. That is, the outer diameter at the tip of the side lip portion 25 is larger than the outer diameter at the base end portion of the side lip portion 25.
　中間リップ部２６は、シール基部２２の側面２２ａにおける内周部側の端部から延びている。中間リップ部２６は、グリースリップ部２４とサイドリップ部２５との間に位置している。中間リップ部２６の基端部は、シール基部２２の側面２２ａに接続されている。中間リップ部２６の先端部は、フランジ部１０３の基端部のうち内輪本体１０２に連続する曲面状の部位に摺動自在に接触している。中間リップ部２６は、その基端部から先端部に向かって拡径するテーパー筒状に形成されている。すなわち、中間リップ部２６の先端部における外径は、当該中間リップ部２６の基端部における外径よりも大きい。 The intermediate lip portion 26 extends from the end portion on the inner peripheral portion side of the side surface 22a of the seal base portion 22. The intermediate lip portion 26 is located between the grease lip portion 24 and the side lip portion 25. The base end portion of the intermediate lip portion 26 is connected to the side surface 22a of the seal base portion 22. The tip of the intermediate lip portion 26 is slidably in contact with a curved surface portion of the base end portion of the flange portion 103 that is continuous with the inner ring main body 102. The intermediate lip portion 26 is formed in a tapered tubular shape whose diameter increases from the base end portion to the tip end portion. That is, the outer diameter of the tip portion of the intermediate lip portion 26 is larger than the outer diameter of the base end portion of the intermediate lip portion 26.
　シール延伸部２３は、円筒部１Ａにおけるフランジ部１０３側の端部から径方向外方に延びている。そして、シール延伸部２３の一部が、外輪本体１０１の端面１０１ａに当接している。具体的には、シール延伸部２３は、第１延伸部２３ａと延長部２３ｂと第２延伸部２３ｃとを有する。 The seal extending portion 23 extends radially outward from the end portion of the cylindrical portion 1A on the flange portion 103 side. Then, a part of the seal extending portion 23 is in contact with the end surface 101a of the outer ring main body 101. Specifically, the seal stretched portion 23 has a first stretched portion 23a, an extended portion 23b, and a second stretched portion 23c.
　第１延伸部２３ａは、平面視で円盤状に形成されている。具体的には、第１延伸部２３ａは、補強環１０の第１円盤部１２のうちフランジ部１０３側の側面１２ａに沿って径方向外方に延びている。延長部２３ｂは、第１延伸部２３ａと同様に平面視で円盤状に形成されている。具体的には、延長部２３ｂは、第１延伸部２３ａの外周部から更に径方向外方に延び、補強環１０の第１円盤部１２の外周部を覆う。第２延伸部２３ｃは、延長部２３ｂの内周部から径方向内方に延びる円盤状の部分である。第２延伸部２３ｃは、補強環１０の第１円盤部１２のうち側面１２ａとは反対側の側面１２ｂに沿って延びている。第２延伸部２３ｃは、側面１２ｂを覆う。 The first stretched portion 23a is formed in a disk shape in a plan view. Specifically, the first stretched portion 23a extends radially outward along the side surface 12a on the flange portion 103 side of the first disk portion 12 of the reinforcing ring 10. The extension portion 23b is formed in a disk shape in a plan view like the first extension portion 23a. Specifically, the extension portion 23b extends further radially outward from the outer peripheral portion of the first extension portion 23a and covers the outer peripheral portion of the first disk portion 12 of the reinforcing ring 10. The second extending portion 23c is a disk-shaped portion extending inward in the radial direction from the inner peripheral portion of the extending portion 23b. The second stretched portion 23c extends along the side surface 12b of the first disk portion 12 of the reinforcing ring 10 opposite to the side surface 12a. The second stretched portion 23c covers the side surface 12b.
　この密封装置１において、補強環１０の第１円盤部１２とシール本体２０のシール延伸部２３とは、延伸部１Ｂを構成する。延伸部１Ｂは、全体として円筒部１Ａの端部から外輪部材１０１Ａ（外輪本体１０１）の外周面１０１ｃより径方向外側まで延びている。すなわち、延伸部１Ｂの外周部（詳しくは、延長部２３ｂ）は、外輪本体１０１の外周面１０１ｃよりも径方向外側に突出している。また、延伸部１Ｂは、外輪部材１０１Ａの端面１０１ａに当接する当接面１Ｂ１を有する。この延長部２３ｂは、雨水、泥水又は埃といった異物が、後述する第１面２７１とフランジ部１０３との間の隙間に到達する経路を制限する機能を有している。なお、本実施形態において、第１円盤部１２とシール延伸部２３とにより構成される延伸部１Ｂが、本発明に係る「延伸部」に相当する。 In this sealing device 1, the first disk portion 12 of the reinforcing ring 10 and the seal extending portion 23 of the seal main body 20 form the extending portion 1B. As a whole, the stretched portion 1B extends from the end of the cylindrical portion 1A to the outer side in the radial direction from the outer peripheral surface 101c of the outer ring member 101A (outer ring main body 101). That is, the outer peripheral portion (specifically, the extension portion 23b) of the stretched portion 1B protrudes radially outward from the outer peripheral surface 101c of the outer ring main body 101. Further, the stretched portion 1B has a contact surface 1B1 that abuts on the end surface 101a of the outer ring member 101A. The extension portion 23b has a function of limiting the path by which foreign matter such as rainwater, muddy water, or dust reaches the gap between the first surface 271 and the flange portion 103, which will be described later. In the present embodiment, the stretched portion 1B composed of the first disk portion 12 and the seal stretched portion 23 corresponds to the “stretched portion” according to the present invention.
　ここで、密封装置１がハブベアリング１００に装着されることによって、ハブベアリング１００内に円環状の内部空間Ｓ１が画成される。この装着の過程において、シール延伸部２３の第２延伸部２３ｃ（詳しくは、延伸部１Ｂの当接面１Ｂ１）は、外輪本体１０１の端面１０１ａに押圧されることで弾性変形する。また、各リップ部（２４，２５，２６）の先端部も、対応する箇所にそれぞれ接触して弾性変形する。なお、図１では、弾性変形前の状態が示されている。密封装置１の各リップ部（２４，２５，２６）は、グリースが内部空間Ｓ１から外部へ漏れ出ることを防止又は抑制する機能と、埃、雨水又は泥水といった異物が外部から内部空間Ｓ１へ侵入することを防止又は抑制する機能とを有している。 Here, by mounting the sealing device 1 on the hub bearing 100, an annular internal space S1 is defined in the hub bearing 100. In this mounting process, the second stretched portion 23c of the seal stretched portion 23 (specifically, the contact surface 1B1 of the stretched portion 1B) is elastically deformed by being pressed against the end surface 101a of the outer ring main body 101. Further, the tip portions of the lip portions (24, 25, 26) also come into contact with the corresponding portions and elastically deform. Note that FIG. 1 shows the state before elastic deformation. Each lip portion (24, 25, 26) of the sealing device 1 has a function of preventing or suppressing grease from leaking from the internal space S1 to the outside, and foreign matter such as dust, rainwater or muddy water invades the internal space S1 from the outside. It has a function to prevent or suppress this.
　ところで、前述したように、フランジ部１０３のフランジ背面１０３ａは、断面視で階段状に形成されている。外輪部材１０１Ａの端面１０１ａとの関係に着目すると、フランジ背面１０３ａは、径方向外側ほど外輪部材１０１Ａの端面１０１ａから中心軸Ｏの方向に段階的に離れるように、階段状に形成されている。これに対応して、密封装置１の延伸部１Ｂにおけるフランジ部１０３側の側面（換言すると、延伸部１Ｂにおける当接面１Ｂ１と反対側の面）についても、以下に詳述するように断面視で階段状に形成されている。 By the way, as described above, the flange back surface 103a of the flange portion 103 is formed in a stepped shape in a cross-sectional view. Focusing on the relationship with the end surface 101a of the outer ring member 101A, the flange back surface 103a is formed in a stepped shape so as to be gradually separated from the end surface 101a of the outer ring member 101A in the direction of the central axis O toward the outer side in the radial direction. Correspondingly, the side surface of the stretched portion 1B of the sealing device 1 on the flange portion 103 side (in other words, the surface of the stretched portion 1B opposite to the contact surface 1B1) is also cross-sectionally viewed as described in detail below. It is formed in a staircase pattern.
　[密閉装置の詳細構造]
　次に、本実施形態における密封装置１の詳細構造について説明する。図２は密封装置１の要部を拡大した断面図である。 [Detailed structure of sealing device]
Next, the detailed structure of the sealing device 1 in the present embodiment will be described. FIG. 2 is an enlarged cross-sectional view of a main part of the sealing device 1.
　密封装置１の延伸部１Ｂのうちフランジ部１０３側の表面には段差部２７が設けられている。段差部２７は、径方向外側ほど当接面１Ｂ１（換言すると、外輪部材１０１Ａの端面１０１ａ）に対して段階的に離れる複数の面２７ａを有する。本実施形態では、延伸部１Ｂにおけるフランジ部１０３側の側面の全体が段差部２７を構成している。本実施形態では、段差部２７が二つの段差を有している場合を例示する。なお、段差部２７における段差の個数（換言すると、段数）は特に限定されるものではない。段差部２７における段数は、例えば、ハブベアリング１００（軸受装置）のフランジ部１０３におけるフランジ背面１０３ａの形状に応じて設定される。例えば、段差部２７に三つ以上の段差が必要な場合には、面２７ａは四つ以上設ければよい。以下において、「段差」とは、段差部２７において、当接面１Ｂ１を基準とした中心軸Ｏの方向における高さ（距離）が急激に変化する箇所（部位）を意味する。 A step portion 27 is provided on the surface of the stretched portion 1B of the sealing device 1 on the flange portion 103 side. The step portion 27 has a plurality of surfaces 27a that are gradually separated from the contact surface 1B1 (in other words, the end surface 101a of the outer ring member 101A) toward the outer side in the radial direction. In the present embodiment, the entire side surface of the stretched portion 1B on the flange portion 103 side constitutes the step portion 27. In this embodiment, a case where the step portion 27 has two steps is illustrated. The number of steps (in other words, the number of steps) in the step portion 27 is not particularly limited. The number of steps in the step portion 27 is set according to, for example, the shape of the flange back surface 103a in the flange portion 103 of the hub bearing 100 (bearing device). For example, when three or more steps are required on the step portion 27, four or more surfaces 27a may be provided. In the following, the “step” means a portion (site) in the step portion 27 where the height (distance) in the direction of the central axis O with respect to the contact surface 1B1 suddenly changes.
　本実施形態では、段差部２７は、複数の面２７ａとして、径方向外側から順に、第１面２７１と第２面２７２と第３面２７３とを有している。第１面２７１、第２面２７２及び第３面２７３は、それぞれ外輪本体１０１及び内輪本体１０２の中心軸Ｏと直交する方向に延びる円環状の平坦面（中心軸Ｏに対する垂直面）からなる。換言すると、複数の面２７ａは、径方向で最も外側の第１面２７１と、第１面２７１より径方向内側の第２面２７２と、第２面２７２より径方向内側の第３面２７３とを含んでいる。当接面１Ｂ１を基準とした段差部２７の各面２７ａ（２７１，２７２，２７３）の高さ（当接面１Ｂ１に対する中心軸Ｏの方向の距離）は、第３面２７３、第２面２７２、第１面２７１の順で高くなっている。すなわち、当接面１Ｂ１と第１面２７１との距離は、当接面１Ｂ１と第２面２７２との距離よりも大きく、当接面１Ｂ１と第２面２７２との距離は、当接面１Ｂ１と第３面２７３との距離よりも大きい。つまり、段差部２７は、径方向外側に向かって上り又は径方向内側に向かって下りの階段状に形成されている。なお、本実施形態では、第２面２７２又は第３面２７３が本発明に係る「第１面」に相当する。第２面２７２を「第１面」とした場合、第１面２７１が本発明に係る「第２面」に相当し、第３面２７３を「第１面」とした場合、第１面２７１又は第２面２７２が本発明に係る「第２面」に相当する。また、本実施形態では、第１面２７１が本発明に係る「複数の面のうち径方向で最も外側の面」であり、第３面２７３が本発明に係る「複数の面のうち径方向で最も内側の面」に相当する。 In the present embodiment, the stepped portion 27 has a first surface 271, a second surface 272, and a third surface 273 in order from the outside in the radial direction as a plurality of surfaces 27a. The first surface 271, the second surface 272, and the third surface 273 are formed of an annular flat surface (a plane perpendicular to the central axis O) extending in a direction orthogonal to the central axis O of the outer ring main body 101 and the inner ring main body 102, respectively. In other words, the plurality of surfaces 27a are the outermost first surface 271 in the radial direction, the second surface 272 radially inner than the first surface 271, and the third surface 273 radially inner than the second surface 272. Includes. The height of each surface 27a (271,272,273) of the stepped portion 27 with respect to the contact surface 1B1 (distance in the direction of the central axis O with respect to the contact surface 1B1) is the third surface 273 and the second surface 272. , The first surface 271 is higher in this order. That is, the distance between the contact surface 1B1 and the first surface 271 is larger than the distance between the contact surface 1B1 and the second surface 272, and the distance between the contact surface 1B1 and the second surface 272 is the contact surface 1B1. Is greater than the distance between and the third surface 273. That is, the step portion 27 is formed in a stepped shape that goes up toward the outside in the radial direction or goes down toward the inside in the radial direction. In the present embodiment, the second surface 272 or the third surface 273 corresponds to the "first surface" according to the present invention. When the second surface 272 is the "first surface", the first surface 271 corresponds to the "second surface" according to the present invention, and when the third surface 273 is the "first surface", the first surface 271 Alternatively, the second surface 272 corresponds to the "second surface" according to the present invention. Further, in the present embodiment, the first surface 271 is the "outermost surface in the radial direction among the plurality of surfaces" according to the present invention, and the third surface 273 is the "diameter direction among the plurality of surfaces" according to the present invention. Corresponds to the "innermost surface".
　具体的には、第１面２７１の外縁は延伸部１Ｂの径方向の最も外側に位置している。段差部２７は、第１面２７１と第２面２７２と第３面２７３とに加えて第１傾斜面２７４と第２傾斜面２７５とを含む。第１傾斜面２７４は、第１面２７１の内縁と第２面２７２の外縁との間を接続する面である。第１傾斜面２７４は、第１面２７１及び第２面２７２に対して傾斜している。第２傾斜面２７５は、第２面２７２の内縁と第３面２７３の外縁との間を接続する面である。第２傾斜面２７５は、第２面２７２及び第３面２７３に対して傾斜している。第１傾斜面２７４及び第２傾斜面２７５はそれぞれ当接面１Ｂ１側ほど縮径するように傾斜している。すなわち、第１傾斜面２７４のうち当接面１Ｂ１に近い端部における内径は、当該第１傾斜面２７４のうちフランジ部１０３に近い端部における内径よりも小さい。同様に、第２傾斜面２７５のうち当接面１Ｂ１に近い端部における内径は、当該第２傾斜面２７５のうちフランジ部１０３に近い端部における内径よりも小さい。 Specifically, the outer edge of the first surface 271 is located on the outermost side in the radial direction of the stretched portion 1B. The stepped portion 27 includes a first inclined surface 274 and a second inclined surface 275 in addition to the first surface 271, the second surface 272, and the third surface 273. The first inclined surface 274 is a surface connecting between the inner edge of the first surface 271 and the outer edge of the second surface 272. The first inclined surface 274 is inclined with respect to the first surface 271 and the second surface 272. The second inclined surface 275 is a surface connecting between the inner edge of the second surface 272 and the outer edge of the third surface 273. The second inclined surface 275 is inclined with respect to the second surface 272 and the third surface 273. The first inclined surface 274 and the second inclined surface 275 are inclined so as to reduce the diameter toward the contact surface 1B1 side, respectively. That is, the inner diameter of the first inclined surface 274 near the contact surface 1B1 is smaller than the inner diameter of the first inclined surface 274 near the flange 103. Similarly, the inner diameter of the second inclined surface 275 near the contact surface 1B1 is smaller than the inner diameter of the second inclined surface 275 near the flange 103.
　更に、段差部２７は、第１角部２７６と第２角部２７７とを含む。第１角部２７６は、第１面２７１と第１傾斜面２７４とが交差する部位である。第２角部２７７は、第２面２７２と第２傾斜面２７５とが交差する部位である。第１角部２７６及び第２角部２７７は、それぞれ滑らかなＲ形状に形成されている。段差部２７のうち第１傾斜面２７４の部位と第２傾斜面２７５の部位とに段差が形成されている。 Further, the step portion 27 includes the first corner portion 276 and the second corner portion 277. The first corner portion 276 is a portion where the first surface 271 and the first inclined surface 274 intersect. The second corner portion 277 is a portion where the second surface 272 and the second inclined surface 275 intersect. The first corner portion 276 and the second corner portion 277 are each formed into a smooth R shape. A step is formed between the portion of the first inclined surface 274 and the portion of the second inclined surface 275 in the step portion 27.
　本実施形態では、延伸部１Ｂのうち当該延伸部１Ｂの外縁部を含む外側部位１Ｂ２の厚みは、延伸部１Ｂのうち当接面１Ｂ１を含む内側部位１Ｂ３の厚みより小さく設定されている。外側部位１Ｂ２は、延長部２３ｂのうち先端側の部位である。内側部位１Ｂ３は、延長部２３ｂのうち基端側の部位である。外側部位１Ｂ２及び内側部位１Ｂ３の各々の厚みは、中心軸Ｏの方向における板厚を意味する。本実施形態では、延伸部１Ｂの延長部２３ｂにおける当接面１Ｂ１側の面に、外周面から径方向内方に凹んだ切欠部２３ｂ１が形成されている。この切欠部２３ｂ１によって、延伸部１Ｂにおける外側部位１Ｂ２の厚みが、延長部２３ｂの基端部と第２延伸部２３ｃと補強環１０の第１円盤部１２とを含む部位の厚みより小さく（薄く）なっている。 In the present embodiment, the thickness of the outer portion 1B2 of the stretched portion 1B including the outer edge portion of the stretched portion 1B is set smaller than the thickness of the inner portion 1B3 of the stretched portion 1B including the contact surface 1B1. The outer portion 1B2 is a portion on the distal end side of the extension portion 23b. The inner portion 1B3 is a portion of the extension portion 23b on the proximal end side. The thickness of each of the outer portion 1B2 and the inner portion 1B3 means the plate thickness in the direction of the central axis O. In the present embodiment, a notch 23b1 recessed inward in the radial direction from the outer peripheral surface is formed on the surface of the extension portion 23b of the extension portion 1B on the contact surface 1B1 side. Due to this notch 23b1, the thickness of the outer portion 1B2 in the stretched portion 1B is smaller (thinner) than the thickness of the portion including the base end portion of the extension portion 23b, the second stretched portion 23c, and the first disk portion 12 of the reinforcing ring 10. ).
　本実施形態では、複数の面２７ａのうち第１面２７１の内縁（換言すると、第１角部２７６）は外側部位１Ｂ２に位置している。また、第１面２７１の内縁（第１角部２７６）は、フランジ部１０３のうち、外縁背面部１０３ａ１と中間背面部１０３ａ２との境界（角部）より径方向外側の部位（外縁背面部１０３ａ１のうち中心軸Ｏに対して概ね直交する方向に延びる部位）に相対する。すなわち、第１面２７１の内縁（第１角部２７６）は、外縁背面部１０３ａ１の内縁側の部位に相対する。第１面２７１の内縁と外縁背面部１０３ａ１とが平面視で重複すると換言してもよい。 In the present embodiment, the inner edge of the first surface 271 (in other words, the first corner portion 276) of the plurality of surfaces 27a is located at the outer portion 1B2. Further, the inner edge (first corner portion 276) of the first surface 271 is a portion (outer edge back portion 103a1) of the flange portion 103 that is radially outer from the boundary (corner portion) between the outer edge back portion 103a1 and the intermediate back surface portion 103a2. Of these, a portion extending in a direction substantially orthogonal to the central axis O). That is, the inner edge (first corner portion 276) of the first surface 271 faces the portion on the inner edge side of the outer edge back surface portion 103a1. In other words, the inner edge of the first surface 271 and the outer edge back surface 103a1 overlap in a plan view.
　本実施形態では、複数の面２７ａのうち第２面２７２の内縁（換言すると、第２角部２７７）は、外側部位１Ｂ２より径方向内側に位置している。具体的には、第２面２７２の内縁（第２角部２７７）は、外側部位１Ｂ２より径方向内側であり、且つ、外輪部材１０１Ａの外周面１０１ｃより径方向外側に位置している。また、第２面２７２の内縁（第２角部２７７）は、フランジ部１０３の中間背面部１０３ａ２のうち中心軸Ｏに対して概ね直交する方向に延びる部位に相対する。換言すると、第２面２７２の内縁（第２角部２７７）は、中間背面部１０３ａ２のうち外縁に近い部位に相対する。第２面２７２の内縁と中間背面部１０３ａ２とが平面視で重複すると換言してもよい。 In the present embodiment, the inner edge of the second surface 272 (in other words, the second corner portion 277) of the plurality of surfaces 27a is located radially inside the outer portion 1B2. Specifically, the inner edge (second corner portion 277) of the second surface 272 is located radially inside the outer portion 1B2 and radially outside the outer ring member 101A from the outer peripheral surface 101c. Further, the inner edge (second corner portion 277) of the second surface 272 faces a portion of the intermediate back surface portion 103a2 of the flange portion 103 that extends in a direction substantially orthogonal to the central axis O. In other words, the inner edge (second corner portion 277) of the second surface 272 faces the portion of the intermediate back surface portion 103a2 close to the outer edge. In other words, the inner edge of the second surface 272 and the intermediate back surface portion 103a2 overlap in a plan view.
　また、第２面２７２と中間背面部１０３ａ２とが相対する範囲の径方向における長さは、第１面２７１と外縁背面部１０３ａ１とが相対する範囲の径方向における長さ、及び、第３面２７３と内縁背面部１０３ａ３とが相対する範囲の径方向における長さよりも長い。 Further, the radial length of the range in which the second surface 272 and the intermediate back surface portion 103a2 face each other is the radial length in the range in which the first surface 271 and the outer edge back surface portion 103a1 face each other, and the third surface. It is longer than the length in the radial direction in the range where the 273 and the inner edge back surface 103a3 face each other.
　本実施形態では、複数の面２７ａのうち第３面２７３の内縁は、径方向において、延伸部１Ｂにおける外輪部材１０１Ａの端面１０１ａに対応する位置にある。具体的には、第３面２７３の内縁は、平面視で端面１０１ａに重複する。また、第３面２７３の内縁は、フランジ部１０３のうち、内縁背面部１０３ａ３と中間背面部１０３ａ２との境界（角部）より径方向内側の部位（内縁背面部１０３ａ３のうち中心軸Ｏと直交する方向に延びる部位）に相対する。すなわち、第３面２７３の内縁は、内縁背面部１０３ａ３の外縁の近傍の部位に相対する。第３面２７３の内縁と内縁背面部１０３ａ３とが平面視で重複すると換言してもよい。 In the present embodiment, the inner edge of the third surface 273 of the plurality of surfaces 27a is located at a position corresponding to the end surface 101a of the outer ring member 101A in the stretched portion 1B in the radial direction. Specifically, the inner edge of the third surface 273 overlaps the end surface 101a in a plan view. Further, the inner edge of the third surface 273 is a portion of the flange portion 103 that is radially inside from the boundary (corner portion) between the inner edge back portion 103a3 and the intermediate back portion 103a2 (of the inner edge back portion 103a3, orthogonal to the central axis O). It faces the part that extends in the direction of That is, the inner edge of the third surface 273 faces a portion near the outer edge of the inner edge back surface portion 103a3. In other words, the inner edge of the third surface 273 and the inner edge back surface portion 103a3 overlap in a plan view.
　本実施形態では、延伸部１Ｂの段差部２７において、複数の面２７ａとフランジ部１０３との間には、それぞれ、隙間が空けられている。具体的には、延伸部１Ｂが弾性変形していない自由状態において、第１面２７１と外縁背面部１０３ａ１との間、第２面２７２と中間背面部１０３ａ２との間、及び、第３面２７３と内縁背面部１０３ａ３との間には、それぞれ、隙間が形成されている。 In the present embodiment, in the stepped portion 27 of the stretched portion 1B, a gap is provided between the plurality of surfaces 27a and the flange portion 103, respectively. Specifically, in a free state in which the stretched portion 1B is not elastically deformed, between the first surface 271 and the outer edge back surface 103a1, between the second surface 272 and the intermediate back surface 103a2, and the third surface 273. A gap is formed between the inner edge and the back surface portion 103a3, respectively.
　本実施形態では、第１面２７１とフランジ部１０３（外縁背面部１０３ａ１）との間の隙間は、第２面２７２とフランジ部１０３（中間背面部１０３ａ２）との間の隙間より大きい。また、第２面２７２とフランジ部１０３との間の隙間は、例えば、第３面２７３とフランジ部１０３（内縁背面部１０３ａ３）との間の隙間より大きい。以上の例示の通り、本実施形態では、延伸部１Ｂが弾性変形していない自由状態の段差部２７において、段差部２７とフランジ背面１０３ａとの間の隙間が、径方向外側ほど段階的に大きくなる。 In the present embodiment, the gap between the first surface 271 and the flange portion 103 (outer edge back portion 103a1) is larger than the gap between the second surface 272 and the flange portion 103 (intermediate back surface portion 103a2). Further, the gap between the second surface 272 and the flange portion 103 is larger than the gap between the third surface 273 and the flange portion 103 (inner edge back surface portion 103a3), for example. As described above, in the present embodiment, in the stepped portion 27 in the free state in which the stretched portion 1B is not elastically deformed, the gap between the stepped portion 27 and the flange back surface 103a is gradually increased toward the outer side in the radial direction. Become.
　第１面２７１は、外縁背面部１０３ａ１と協働して外縁側のラビリンスシールを構成している。この外縁側のラビリンスシールは、第１面２７１とフランジ背面１０３ａとの間の隙間を介して、雨水又は泥水などの流体（以下「外部液体」という）が、第２面２７２とフランジ背面１０３ａとの間の領域に流入することを抑制又は防止する機能を有する。また、第２面２７２は、外縁側のラビリンスシールよりも径方向内側において、中間背面部１０３ａ２と協働して中間のラビリンスシールを構成している。この中間のラビリンスシールは、外縁側のラビリンスシールを通過した外部液体が、第３面２７３とフランジ背面１０３ａとの間の領域に流入することを抑制又は防止する機能を有する。第３面２７３は、中間のラビリンスシールよりも径方向内側において、内縁背面部１０３ａ３と協働して内縁側のラビリンスシールを構成している。この内縁側のラビリンスシールは、中間のラビリンスシールを通過した外部液体が、シール本体２０のシール基部２２とフランジ背面１０３ａとの間の領域に流入することを抑制又は防止する機能を有する。ラビリンスシールは、相対する２個の部材間の凹凸により形成される非接触シールである。 The first surface 271 constitutes a labyrinth seal on the outer edge side in cooperation with the outer edge back surface portion 103a1. In the labyrinth seal on the outer edge side, a fluid such as rainwater or muddy water (hereinafter referred to as "external liquid") passes through the gap between the first surface 271 and the flange back surface 103a, and the second surface 272 and the flange back surface 103a. It has a function of suppressing or preventing inflow into the area between. Further, the second surface 272 forms an intermediate labyrinth seal in cooperation with the intermediate back surface portion 103a2 on the inner side in the radial direction from the labyrinth seal on the outer edge side. The intermediate labyrinth seal has a function of suppressing or preventing the external liquid that has passed through the labyrinth seal on the outer edge side from flowing into the region between the third surface 273 and the flange back surface 103a. The third surface 273 constitutes the labyrinth seal on the inner edge side in cooperation with the inner edge back surface portion 103a3 on the inner side in the radial direction from the intermediate labyrinth seal. The labyrinth seal on the inner edge side has a function of suppressing or preventing the external liquid that has passed through the intermediate labyrinth seal from flowing into the region between the seal base 22 of the seal body 20 and the flange back surface 103a. The labyrinth seal is a non-contact seal formed by the unevenness between two opposing members.
　なお、本実施形態では、中間のラビリンスシールの径方向における長さが、外縁側のラビリンスシールの径方向における長さよりも長い。なお、中間のラビリンスシールの径方向における長さは、第２面２７２と中間背面部１０３ａ２とが平面視で重複する範囲の径方向における長さである。外縁側のラビリンスシールの径方向における長さは、第１面２７１と外縁背面部１０３ａ１とが平面視で重複する範囲の径方向における長さである。 In the present embodiment, the radial length of the intermediate labyrinth seal is longer than the radial length of the outer labyrinth seal. The length of the intermediate labyrinth seal in the radial direction is the length in the radial direction in the range where the second surface 272 and the intermediate back surface portion 103a2 overlap in a plan view. The radial length of the labyrinth seal on the outer edge side is the radial length of the range in which the first surface 271 and the outer edge back surface portion 103a1 overlap in a plan view.
　また、中間のラビリンスシールの径方向における長さは、内縁側のラビリンスシールの径方向における長さよりも長い。内縁側のラビリンスシールの径方向における長さは、第３面２７３と内縁背面部１０３ａ３とが平面視で重複する範囲の径方向における長さである。 Also, the radial length of the intermediate labyrinth seal is longer than the radial length of the labyrinth seal on the inner edge side. The radial length of the labyrinth seal on the inner edge side is the radial length of the range in which the third surface 273 and the inner edge back surface portion 103a3 overlap in a plan view.
　次に、雨水又は泥水などの外部液体Ｍに対する密封装置１の密封作用及び排出作用について図３を参照して説明する。なお、図３においては、紙面上側が鉛直方向の上方であり、紙面下側が鉛直方向の下方である。 Next, the sealing action and the discharging action of the sealing device 1 with respect to the external liquid M such as rainwater or muddy water will be described with reference to FIG. In FIG. 3, the upper side of the paper surface is the upper side in the vertical direction, and the lower side of the paper surface is the lower side in the vertical direction.
　車輪によって地面から飛散した外部液体Ｍが、ハブベアリング１００に付着する場合がある。そして、例えば、フランジ部１０３のうち鉛直方向の上側領域の周囲では、外輪本体１０１の周囲からフランジ部１０３のフランジ背面１０３ａに向かって外部液体Ｍが飛散する場合がある。この場合、フランジ背面１０３ａに向かう外部液体Ｍの一部は、延伸部１Ｂの延長部２３ｂにおける切欠部２３ｂ１に衝突する。つまり、延長部２３ｂは、段差部２７とフランジ背面１０３ａとの間の隙間に外部液体Ｍが到達する経路を阻害するスプラッシュガード（堰部）として機能する。例えば、外部液体Ｍが勢いよく延伸部１Ｂの切欠部２３ｂ１に衝突すると、図３に示すように、延伸部１Ｂの外側部位１Ｂ２が、フランジ部１０３側に向かって弾性的に屈曲する。その結果、主に段差部２７の第１面２７１とフランジ背面１０３ａとの間の隙間が、外側部位１Ｂ２の弾性変形前と比較して狭くなる。 External liquid M scattered from the ground by the wheels may adhere to the hub bearing 100. Then, for example, around the upper region of the flange portion 103 in the vertical direction, the external liquid M may scatter from the periphery of the outer ring main body 101 toward the flange back surface 103a of the flange portion 103. In this case, a part of the external liquid M toward the back surface 103a of the flange collides with the notch 23b1 in the extension 23b of the extension 1B. That is, the extension portion 23b functions as a splash guard (weir portion) that obstructs the path for the external liquid M to reach the gap between the step portion 27 and the flange back surface 103a. For example, when the external liquid M vigorously collides with the cutout portion 23b1 of the stretched portion 1B, the outer portion 1B2 of the stretched portion 1B elastically bends toward the flange portion 103 side, as shown in FIG. As a result, the gap between the first surface 271 of the step portion 27 and the flange back surface 103a is narrowed as compared with that before the elastic deformation of the outer portion 1B2.
　ここで、フランジ背面１０３ａに向かう外部液体Ｍの一部は、延伸部１Ｂの延長部２３ｂの外縁部（図３では上端部）を超え得る。しかし、延伸部１Ｂのフランジ部１０３側の側面には、段差部２７とフランジ背面１０３ａとにより構成された複数のラビリンスシールが形成されている。したがって、ハブベアリング１００の内部空間Ｓ１への外部液体Ｍの流入が抑制又は防止される。 Here, a part of the external liquid M toward the back surface 103a of the flange may exceed the outer edge portion (upper end portion in FIG. 3) of the extension portion 23b of the extension portion 1B. However, on the side surface of the stretched portion 1B on the flange portion 103 side, a plurality of labyrinth seals composed of the step portion 27 and the flange back surface 103a are formed. Therefore, the inflow of the external liquid M into the internal space S1 of the hub bearing 100 is suppressed or prevented.
　なお、例えば、外部液体Ｍが切欠部２３ｂ１に衝突しない場合がある。また、切欠部２３ｂ１に対する外部液体Ｍの衝突が緩やかであるため延伸部１Ｂの外側部位１Ｂ２の弾性変形が微少な場合もある。これらの場合には、第１面２７１とフランジ背面１０３ａとの間の隙間が他の部位における隙間に対して大きい状態に維持されている。そのため、外部液体Ｍの一部が鉛直方向の上側から第１面２７１と外縁背面部１０３ａ１との間の隙間に到達して、この隙間を通過してしまうことが想定される。しかし、この場合でも、第２面２７２と中間背面部１０３ａ２とにより構成される中間のラビリンスシールによって、第３面２７３と中間背面部１０３ａ２との間への外部液体Ｍの流入が抑制又は防止される。また、外部液体Ｍの一部が中間のラビリンスシールを通過する場合が想定される。この場合でも、第３面２７３と内縁背面部１０３ａ３とにより構成された内縁側のラビリンスシールによって、シール本体２０のシール基部２２と内縁背面部１０３ａ３との間の領域への外部液体Ｍの流入が抑制又は防止される。これらによって、ハブベアリング１００の内部空間Ｓ１への外部液体Ｍの流入が抑制又は防止される。なお、例えば、外縁側のラビリンスシールを通過して、第２面２７２と外縁背面部１０３ａ１との間の円環状の領域の鉛直方向の上側の領域に流入した外部液体Ｍの大半又は全部は、その後、例えば、この円環状の領域内を周方向に流れて鉛直方向の下側に流れ落ちる。この鉛直方向の下側に流れ落ちた外部液体Ｍは、比較的に大きな隙間に維持されている第１面２７１と外縁背面部１０３ａ１との間の隙間を介して外部（密封装置１の下方）に速やかに排出される。 Note that, for example, the external liquid M may not collide with the notch 23b1. Further, since the collision of the external liquid M with the notch portion 23b1 is gentle, the elastic deformation of the outer portion 1B2 of the stretched portion 1B may be slight. In these cases, the gap between the first surface 271 and the flange back surface 103a is maintained in a large state with respect to the gap in other portions. Therefore, it is assumed that a part of the external liquid M reaches the gap between the first surface 271 and the outer edge back surface portion 103a1 from the upper side in the vertical direction and passes through this gap. However, even in this case, the intermediate labyrinth seal composed of the second surface 272 and the intermediate back surface portion 103a2 suppresses or prevents the inflow of the external liquid M between the third surface 273 and the intermediate back surface portion 103a2. To. Further, it is assumed that a part of the external liquid M passes through the intermediate labyrinth seal. Even in this case, the labyrinth seal on the inner edge side composed of the third surface 273 and the inner edge back surface 103a3 allows the external liquid M to flow into the region between the seal base 22 and the inner edge back surface 103a3 of the seal body 20. Suppressed or prevented. As a result, the inflow of the external liquid M into the internal space S1 of the hub bearing 100 is suppressed or prevented. For example, most or all of the external liquid M that has passed through the labyrinth seal on the outer edge side and has flowed into the upper region in the vertical direction of the annular region between the second surface 272 and the outer edge back surface portion 103a1. Then, for example, it flows in the circumferential direction in this annular region and flows down in the vertical direction. The external liquid M that has flowed down in the vertical direction goes to the outside (below the sealing device 1) through the gap between the first surface 271 and the outer edge back surface 103a1 that is maintained in a relatively large gap. It is discharged promptly.
　本実施形態による密封装置１によれば、延伸部１Ｂにおけるフランジ部１０３側の段差部２７には、外輪部材１０１Ａの端面１０１ａとの距離が径方向外側に向けて段階的に増加する複数の面２７ａが形成されている。つまり、段差部２７は断面視で階段状に形成されている。また、ハブベアリング１００のフランジ部１０３のフランジ背面１０３ａも、断面視で階段状に形成されている。したがって、フランジ背面１０３ａの形状に対応するように前述の通り段差部２７が階段状に形成されるだけで、段差部２７とフランジ背面１０３ａとによって、複数のラビリンスシールが構成される。以上の通り、本実施形態によれば、簡素な構造でラビリンスシールを構築することが可能な密封装置１を提供できる。 According to the sealing device 1 according to the present embodiment, the stepped portion 27 on the flange portion 103 side of the stretched portion 1B has a plurality of surfaces whose distance from the end surface 101a of the outer ring member 101A gradually increases toward the outer side in the radial direction. 27a is formed. That is, the step portion 27 is formed in a stepped shape in a cross-sectional view. Further, the flange back surface 103a of the flange portion 103 of the hub bearing 100 is also formed in a stepped shape in a cross-sectional view. Therefore, as described above, only the stepped portion 27 is formed in a stepped shape so as to correspond to the shape of the flange back surface 103a, and the stepped portion 27 and the flange back surface 103a form a plurality of labyrinth seals. As described above, according to the present embodiment, it is possible to provide a sealing device 1 capable of constructing a labyrinth seal with a simple structure.
　また、延伸部１Ｂの段差部２７はフランジ部１０３のフランジ背面１０３ａに接触していないため、ハブベアリング１００における回転トルクの増大を抑制できる。その結果、ハブベアリング１００における回転トルクを低減しながら、外部液体Ｍなどの異物に対する密封性の向上が実現される。また、複数のラビリンスシールが同心的且つ多段に設けられるため、外部液体Ｍなどの異物に対する密封性をより効果的に高めることができる。 Further, since the step portion 27 of the extension portion 1B is not in contact with the flange back surface 103a of the flange portion 103, an increase in rotational torque in the hub bearing 100 can be suppressed. As a result, the rotational torque of the hub bearing 100 is reduced, and the sealing property against foreign matter such as the external liquid M is improved. Further, since the plurality of labyrinth seals are provided concentrically and in multiple stages, the sealing property against foreign matter such as the external liquid M can be more effectively improved.
　本実施形態では、延伸部１Ｂの外側部位１Ｂ２の厚みは、延伸部１Ｂの内側部位１Ｂ３の厚みよりも小さい。したがって、延伸部１Ｂの延長部２３ｂにおける先端部の剛性が延長部２３ｂにおける基端部の剛性より低くなる。その結果、外部液体Ｍが延伸部１Ｂの延長部２３ｂに衝突すると、前述したように第１面２７１とフランジ背面１０３ａとの間の隙間が狭くなる。これにより、第１面２７１とフランジ背面１０３ａとにより構成される外縁側のラビリンスシールがより効果的にそのシール機能を発揮する。 In the present embodiment, the thickness of the outer portion 1B2 of the stretched portion 1B is smaller than the thickness of the inner portion 1B3 of the stretched portion 1B. Therefore, the rigidity of the tip portion of the extension portion 23b of the extension portion 1B is lower than the rigidity of the base end portion of the extension portion 23b. As a result, when the external liquid M collides with the extension portion 23b of the extension portion 1B, the gap between the first surface 271 and the flange back surface 103a becomes narrow as described above. As a result, the labyrinth seal on the outer edge side composed of the first surface 271 and the flange back surface 103a exerts its sealing function more effectively.
　本実施形態では、段差部２７の第１面２７１の内縁（第１角部２７６）は外側部位１Ｂ２に位置し、第２面２７２の内縁（第２角部２７７）は外側部位１Ｂ２より径方向内側に位置している。したがって、第２面２７２は、延伸部１Ｂにおける剛性の比較的に高い部位に概ね形成されている。その結果、外部液体Ｍが延伸部１Ｂに勢いよく衝突したとしても、第２面２７２とフランジ背面１０３ａとの間の隙間は概ね設計値に維持され得る。したがって、第２面２７２とフランジ背面１０３ａとにより構成される中間のラビリンスシールは、外部液体Ｍの衝突の有無に関わらず、意図された密封機能を効果的に発揮する。第３面２７３とフランジ背面１０３ａとにより構成される内縁側のラビリンスシールについても、中間のラビリンスシールと同様に、外部液体Ｍの衝突の有無に関わらず、意図された密封機能を効果的に発揮する。 In the present embodiment, the inner edge (first corner portion 276) of the first surface 271 of the step portion 27 is located at the outer portion 1B2, and the inner edge (second corner portion 277) of the second surface 272 is in the radial direction from the outer portion 1B2. It is located inside. Therefore, the second surface 272 is generally formed at a portion of the stretched portion 1B having a relatively high rigidity. As a result, even if the external liquid M vigorously collides with the stretched portion 1B, the gap between the second surface 272 and the flange back surface 103a can be substantially maintained at the design value. Therefore, the intermediate labyrinth seal composed of the second surface 272 and the flange back surface 103a effectively exerts the intended sealing function regardless of the presence or absence of collision of the external liquid M. Similar to the intermediate labyrinth seal, the labyrinth seal on the inner edge side composed of the third surface 273 and the flange back surface 103a effectively exerts the intended sealing function regardless of the presence or absence of collision of the external liquid M. To do.
　本実施形態では、延伸部１Ｂが弾性変形していない自由状態において、第１面２７１とフランジ部１０３（フランジ背面１０３ａ）との間の隙間は、第３面２７３とフランジ部１０３（フランジ背面１０３ａ）との間の隙間より大きい。したがって、外部液体Ｍの衝突による延伸部１Ｂの弾性変形量を見越して、第１面２７１とフランジ背面１０３ａとの間の隙間を第３面２７３とフランジ背面１０３ａとの間の隙間より大きく確保することで、外部液体Ｍの衝突が無い場合又は衝突の勢いが弱い場合などには、第１面２７１とフランジ背面１０３ａとの間の隙間が広く維持される。その結果、鉛直方向の上方から第１面２７１とフランジ背面１０３ａとの間の隙間を通過した外部液体Ｍが鉛直方向の下側において第１面２７１とフランジ背面１０３ａとの間の隙間を介して外部（密封装置１の下方）に速やかに排出される。これにより、外部液体Ｍの排出性を向上させることができる。 In the present embodiment, in the free state where the stretched portion 1B is not elastically deformed, the gap between the first surface 271 and the flange portion 103 (flange back surface 103a) is the third surface 273 and the flange portion 103 (flange back surface 103a). ) Is larger than the gap between them. Therefore, in anticipation of the amount of elastic deformation of the stretched portion 1B due to the collision of the external liquid M, the gap between the first surface 271 and the flange back surface 103a is secured larger than the gap between the third surface 273 and the flange back surface 103a. Therefore, when there is no collision of the external liquid M or when the momentum of the collision is weak, the gap between the first surface 271 and the flange back surface 103a is maintained wide. As a result, the external liquid M that has passed through the gap between the first surface 271 and the flange back surface 103a from above in the vertical direction passes through the gap between the first surface 271 and the flange back surface 103a on the lower side in the vertical direction. It is quickly discharged to the outside (below the sealing device 1). Thereby, the discharge property of the external liquid M can be improved.
　本実施形態では、第２面２７２の内縁（第２角部２７７）も外輪部材１０１Ａの外周面１０１ｃより径方向外側に位置している。これにより、外縁側のラビリンスシール及び中間のラビリンスシールがハブベアリング１００の内部空間Ｓ１から径方向の外方に遠い位置にある。その結果、内部空間Ｓ１に対する密封性が向上し得る。 In the present embodiment, the inner edge (second corner portion 277) of the second surface 272 is also located radially outside the outer peripheral surface 101c of the outer ring member 101A. As a result, the labyrinth seal on the outer edge side and the labyrinth seal in the middle are located far outward in the radial direction from the internal space S1 of the hub bearing 100. As a result, the hermeticity with respect to the internal space S1 can be improved.
［変形例］
　なお、本実施形態では、段差部２７に三つの面２７ａが設けられることにより、三つのラビリンスシールが設けられるものとしたが、ラビリンスシールの個数はこれに限らず、二つでもよく、四つ以上であってもよい。また、段差部２７とフランジ背面１０３ａとの間の隙間が径方向外側に向けて段階的に大きくなる構成を例示したが、これに限らず、段差部２７とフランジ背面１０３ａとの間の隙間は、段差の形成位置などに応じて適宜に設定される。そして、段差部２７の各面２７ａは、中心軸Ｏと直交する方向に延びているものとしたが、これに限らず、例えば、中心軸Ｏに対して僅かに傾斜していてもよい。また、互いに隣接する二つの面２７ａ（例えば、第１面２７１と第２面２７２、第２面２７２と第３面２７３）の間は、中心軸Ｏに対して傾斜した面（第１傾斜面２７４、第２傾斜面２７５）によって接続されているが、これに限らない。互いに隣接する二つの面２７ａは、中心軸Ｏと平行に延びる面によって接続されてもよい。また、本実施形態では、延伸部１Ｂにおけるフランジ部１０３側の側面の全体が段差部２７を構成しており、この側面の全体が階段状に形成されている。しかし、延伸部１Ｂのうち径方向における所定幅の部分のみに段差部２７が形成されてもよい。 [Modification example]
In the present embodiment, three labyrinth seals are provided by providing the three surfaces 27a on the step portion 27, but the number of labyrinth seals is not limited to this, and may be two or four. It may be the above. Further, the configuration in which the gap between the step portion 27 and the flange back surface 103a gradually increases toward the outside in the radial direction is illustrated, but the present invention is not limited to this, and the gap between the step portion 27 and the flange back surface 103a is not limited to this. , It is set appropriately according to the formation position of the step. Each surface 27a of the step portion 27 extends in a direction orthogonal to the central axis O, but is not limited to this, and may be slightly inclined with respect to the central axis O, for example. Further, between two surfaces 27a adjacent to each other (for example, the first surface 271 and the second surface 272, the second surface 272 and the third surface 273), a surface inclined with respect to the central axis O (first inclined surface). 274, second inclined surface 275), but is not limited to this. Two surfaces 27a adjacent to each other may be connected by a surface extending parallel to the central axis O. Further, in the present embodiment, the entire side surface of the stretched portion 1B on the flange portion 103 side constitutes the step portion 27, and the entire side surface is formed in a stepped shape. However, the step portion 27 may be formed only in the portion of the stretched portion 1B having a predetermined width in the radial direction.
　密封装置１は補強環１０を有するものとしたが、これに限らず、補強環１０を有さなくてもよい。この場合、補強環１０に相当する部分は、例えば、シール本体２０と同材料の部材でシール本体２０と一体に形成され得る。また、密封装置１が装着される軸受装置は、ハブベアリング１００に限定されない。例えば、外輪部材と、外輪部材の端面に相対するフランジ部を有する内輪部材と、外輪部材と内輪部材との間に設けられる転動部材とを含む任意の構造の軸受装置に、密封装置１が利用される。 The sealing device 1 is assumed to have the reinforcing ring 10, but the present invention is not limited to this, and the reinforcing ring 10 may not be provided. In this case, the portion corresponding to the reinforcing ring 10 can be formed integrally with the seal body 20 by, for example, a member made of the same material as the seal body 20. Further, the bearing device to which the sealing device 1 is mounted is not limited to the hub bearing 100. For example, the sealing device 1 is attached to a bearing device having an arbitrary structure including an outer ring member, an inner ring member having a flange portion facing the end surface of the outer ring member, and a rolling member provided between the outer ring member and the inner ring member. It will be used.
　以上、本発明の好ましい実施形態及びその変形例について幾つか説明したが、本発明は上記実施形態及び上記変形例に制限されるものではなく、本発明の技術的思想に基づいて種々の変形及び変更が可能である。 Although some preferred embodiments of the present invention and modifications thereof have been described above, the present invention is not limited to the above-described embodiments and the above-mentioned modifications, and various modifications and variations thereof are based on the technical idea of the present invention. It can be changed.
１…密封装置、１Ａ…円筒部、１Ｂ…延伸部、１Ｂ１…当接面、１Ｂ２…外側部位、１Ｂ３…内側部位、２７…段差部、２７ａ…面、２７１…第１面（複数の面のうち径方向で最も外側の面）、２７２…第２面、２７３…第３面（複数の面のうち径方向で最も内側の面）、１００…ハブベアリング（軸受装置）、１０１Ａ…外輪部材、１０１ａ…外輪部材の端面、１０１ｂ…外輪部材の内周面、１０１ｃ…外輪部材の端面側の外周面、１０２Ａ…内輪部材、１０３…フランジ部、１０４…転動部材 1 ... Sealing device, 1A ... Cylindrical part, 1B ... Stretched part, 1B1 ... Contact surface, 1B2 ... Outer part, 1B3 ... Inner part, 27 ... Step part, 27a ... Surface, 271 ... First surface (multiple surfaces) Of these, the outermost surface in the radial direction), 272 ... the second surface, 273 ... the third surface (the innermost surface in the radial direction of the plurality of surfaces), 100 ... the hub bearing (bearing device), 101A ... the outer ring member, 101a ... End surface of the outer ring member, 101b ... Inner peripheral surface of the outer ring member, 101c ... Outer peripheral surface on the end surface side of the outer ring member, 102A ... Inner ring member, 103 ... Flange portion, 104 ... Rolling member

Claims (3)

  1. 　外輪部材と、前記外輪部材の端面に相対するフランジ部を有する内輪部材と、前記外輪部材と前記内輪部材との間に設けられる転動部材とを含む軸受装置に用いられる密封装置であって、
    　前記外輪部材の内側に固定される円筒部と、
    　前記円筒部の端部から前記外輪部材の外周面より径方向外側まで延びる延伸部であって、前記外輪部材の前記端面に当接する当接面を有する延伸部と、
    　を含み、
    　前記延伸部のうち前記フランジ部に相対する部位には、複数の面を有する段差部が設けられ、
    　前記複数の面は、
    　前記当接面に対して第１距離だけ離れた第１面と、
    　前記第１面よりも径方向外側に位置する第２面とを含み、
    　前記第２面は、前記当接面に対して前記第１距離を上回る第２距離だけ離れている、
    　密封装置。     A sealing device used for a bearing device including an outer ring member, an inner ring member having a flange portion facing the end surface of the outer ring member, and a rolling member provided between the outer ring member and the inner ring member.
    A cylindrical portion fixed to the inside of the outer ring member and
    An extension portion extending from the end portion of the cylindrical portion to the outer side in the radial direction from the outer peripheral surface of the outer ring member, and an extension portion having an abutting surface that abuts on the end surface of the outer ring member.
    Including
    A step portion having a plurality of surfaces is provided at a portion of the stretched portion facing the flange portion.
    The plurality of surfaces
    The first surface, which is separated from the contact surface by the first distance,
    Including a second surface located radially outside the first surface,
    The second surface is separated from the contact surface by a second distance exceeding the first distance.
    Sealing device.
  2. 　前記延伸部のうち当該延伸部の外縁部を含む外側部位の厚みは、前記延伸部のうち前記当接面を含む内側部位の厚みよりも小さい
    　請求項１に記載の密封装置。     The sealing device according to claim 1, wherein the thickness of the outer portion of the stretched portion including the outer edge portion of the stretched portion is smaller than the thickness of the inner portion of the stretched portion including the contact surface.
  3. 　前記複数の面のうち径方向において最も外側の面と前記フランジ部との間の隙間は、前記複数の面のうち径方向において最も内側の面と前記フランジ部との間の隙間よりも大きい
    　請求項１又は２に記載の密封装置。     The gap between the outermost surface of the plurality of surfaces in the radial direction and the flange portion is larger than the gap between the innermost surface of the plurality of surfaces in the radial direction and the flange portion. Item 2. The sealing device according to item 1 or 2.
PCT/JP2020/027341 2019-09-13 2020-07-14 Sealing device WO2021049158A1 (en)

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JP2015100856A (en) * 2013-11-21 2015-06-04 株式会社ジェイテクト Assembling device of seal device, assembling method and vehicle bearing device
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