WO2021049158A1 - Dispositif d'étanchéité - Google Patents

Dispositif d'étanchéité 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
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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
English (en)
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/zh
Priority to JP2021545138A priority patent/JPWO2021049158A1/ja
Publication of WO2021049158A1 publication Critical patent/WO2021049158A1/fr

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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.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

Ce dispositif d'étanchéité est utilisé dans un roulement de moyeu comprenant un élément bague extérieure, un élément bague intérieure et des éléments de roulement. L'élément bague intérieure possède une section bride opposée à une surface d'extrémité de l'élément de bague extérieure. Le dispositif d'étanchéité comprend une section cylindrique et une section d'extension. La section cylindrique est fixée au côté intérieur de l'élément bague extérieure. La section d'extension s'étend vers l'extérieur dans la direction radiale au-delà de la surface périphérique extérieure de l'élément bague extérieure depuis une extrémité de la section cylindrique, et comporte une surface de contact qui vient en contact avec une surface d'extrémité de l'élément bague extérieure. Une section à différence de niveau comprenant une pluralité de surfaces est formée dans le côté de section bride de l'élément bague intérieure dans la section d'extension. La pluralité de surfaces sont séparées en outre en étages incrémentaux depuis la surface d'extrémité de l'élément bague extérieure, progressivement vers l'extérieur dans la direction radiale.
PCT/JP2020/027341 2019-09-13 2020-07-14 Dispositif d'étanchéité WO2021049158A1 (fr)

Priority Applications (2)

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CN202080053691.5A CN114222869A (zh) 2019-09-13 2020-07-14 密封装置
JP2021545138A JPWO2021049158A1 (fr) 2019-09-13 2020-07-14

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JP2019167192 2019-09-13
JP2019-167192 2019-09-13

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CN (1) CN114222869A (fr)
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006008898A1 (fr) * 2004-07-16 2006-01-26 Nok Corporation Dispositif d’étanchéité
JP2013231470A (ja) * 2012-04-27 2013-11-14 Uchiyama Manufacturing Corp 密封構造
JP2015100856A (ja) * 2013-11-21 2015-06-04 株式会社ジェイテクト シール装置の組み付け装置、組み付け方法、及び車輪用軸受装置
JP2015224746A (ja) * 2014-05-29 2015-12-14 株式会社ジェイテクト 車輪用転がり軸受装置
DE102016218450A1 (de) * 2016-09-26 2018-03-29 Schaeffler Technologies AG & Co. KG Radlagerdichtung mit integrierter Vordichtung

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Publication number Priority date Publication date Assignee Title
JP2008014384A (ja) * 2006-07-05 2008-01-24 Koyo Sealing Techno Co Ltd 密封装置
JP4807804B2 (ja) * 2008-02-04 2011-11-02 Ｎｔｎ株式会社 車輪用軸受装置
JP2011080570A (ja) * 2009-10-09 2011-04-21 Ntn Corp 車輪用軸受装置
JP5821437B2 (ja) * 2011-09-07 2015-11-24 日本精工株式会社 シールリング付転がり軸受装置
JP6048221B2 (ja) * 2013-03-01 2016-12-21 日本精工株式会社 シールリング付車輪支持用転がり軸受ユニット
JP2015040626A (ja) * 2013-08-23 2015-03-02 日本精工株式会社 転がり軸受ユニット及び転がり軸受ユニットの製造方法
JP5778238B2 (ja) * 2013-11-18 2015-09-16 Nok株式会社 密封装置の製造方法
JP6838354B2 (ja) * 2016-11-01 2021-03-03 日本精工株式会社 シールリング及びシールリング付転がり軸受ユニット

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006008898A1 (fr) * 2004-07-16 2006-01-26 Nok Corporation Dispositif d’étanchéité
JP2013231470A (ja) * 2012-04-27 2013-11-14 Uchiyama Manufacturing Corp 密封構造
JP2015100856A (ja) * 2013-11-21 2015-06-04 株式会社ジェイテクト シール装置の組み付け装置、組み付け方法、及び車輪用軸受装置
JP2015224746A (ja) * 2014-05-29 2015-12-14 株式会社ジェイテクト 車輪用転がり軸受装置
DE102016218450A1 (de) * 2016-09-26 2018-03-29 Schaeffler Technologies AG & Co. KG Radlagerdichtung mit integrierter Vordichtung

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CN114222869A (zh) 2022-03-22
JPWO2021049158A1 (fr) 2021-03-18

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