WO2024009459A1 - 転がり軸受装置 - Google Patents

転がり軸受装置 Download PDF

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Publication number
WO2024009459A1
WO2024009459A1 PCT/JP2022/026976 JP2022026976W WO2024009459A1 WO 2024009459 A1 WO2024009459 A1 WO 2024009459A1 JP 2022026976 W JP2022026976 W JP 2022026976W WO 2024009459 A1 WO2024009459 A1 WO 2024009459A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact
ring
packing
inner ring
circumferential direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/026976
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
丈晴 浦西
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JTEKT Corp
Original Assignee
JTEKT Corp
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 JTEKT Corp filed Critical JTEKT Corp
Priority to PCT/JP2022/026976 priority Critical patent/WO2024009459A1/ja
Priority to CN202280096057.9A priority patent/CN119213232A/zh
Priority to KR1020257003557A priority patent/KR20250034425A/ko
Priority to JP2024531848A priority patent/JPWO2024009459A1/ja
Priority to DE112022007498.1T priority patent/DE112022007498T5/de
Publication of WO2024009459A1 publication Critical patent/WO2024009459A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/24—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly
    • F16C19/26—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly with a single row of rollers
    • 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
    • F16J15/44—Free-space packings
    • F16J15/447—Labyrinth packings
    • F16J15/4476—Labyrinth packings with radial path
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/44—Needle bearings
    • F16C19/46—Needle bearings with one row or needles
    • 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
    • F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
    • F16C23/06—Ball or roller bearings
    • F16C23/08—Ball or roller bearings self-adjusting
    • F16C23/082—Ball or roller bearings self-adjusting by means of at least one substantially spherical surface
    • F16C23/084—Ball or roller bearings self-adjusting by means of at least one substantially spherical surface sliding on a complementary spherical surface
    • 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
    • F16C33/80—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
    • F16J15/002—Sealings comprising at least two sealings in succession
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/44—Free-space packings
    • F16J15/447—Labyrinth packings

Definitions

  • the present disclosure relates to a rolling bearing device.
  • Patent Document 1 discloses a rolling bearing device including a punch-type roll used in a continuous casting machine.
  • the punch-type roll has a small diameter shaft and two large diameter parts having a larger diameter than the small diameter shaft. Since the inner ring included in the rolling bearing device is attached to the small diameter shaft portion, the rolling bearing device is configured to have a two-part structure.
  • Labyrinth rings, packings, and oil seals are used in rolling bearing devices to prevent cooling water and casting scale from entering the bearing interior where multiple rollers of the rolling bearing device are present.
  • the labyrinth ring is attached to the axle box, and the packing and oil seal are attached to the inner ring. The packing and oil seal contact the labyrinth ring.
  • the packing 90 includes a cylindrical portion 91 made of resin and a biasing portion 92 made of rubber in order to have followability with respect to the labyrinth ring 100.
  • the resin cylindrical portion 91 slides into contact with the labyrinth ring 100.
  • the rubber biasing portion 92 is continuously provided along the inner circumference of the cylindrical portion 91 .
  • the biasing portion 92 has a convex portion 93 that contacts a groove bottom surface 96 of the seal groove 95.
  • the packing 90 has followability because the convex portion 93 is mainly elastically deformed.
  • the convex portion 93 will be bent as shown by the two-dot chain line in FIG. This may result in a situation where the In this case, the packing 90 may not be able to exhibit sufficient followability.
  • the followability decreases, the tightness of the packing 90 with respect to the labyrinth ring 100 decreases, and the sealing performance between the packing 90 and the labyrinth ring 100 decreases.
  • an object of the present disclosure is to provide a rolling bearing device including a packing that can improve followability.
  • the rolling bearing device of the present disclosure includes: A pestle-shaped roll, an axle box, an inner ring that rotates integrally with the pestle-shaped roll and has an inner ring raceway; an outer ring having an outer ring raceway facing the inner ring raceway and attached to the axle box; a plurality of rollers disposed between the inner ring raceway and the outer ring raceway; a labyrinth ring attached to the axle box so as to be radially opposed to an axial end of the inner ring; a packing attached to the inner ring and slidingly in contact with the labyrinth ring; an oil seal attached to the inner ring and slidingly in contact with the labyrinth ring; Equipped with The pestle-shaped roll has a small diameter shaft portion to which the inner ring is attached, and two large diameter portions having a larger diameter than the small diameter shaft portion, A first seal groove to which the packing is attached, and a second seal groove to which the oil seal is attached are provided on the outer periphery of the inner
  • the packing is a cylindrical portion that slides into contact with the labyrinth ring; a biasing portion provided on the radially inner side of the cylindrical portion and capable of being elastically deformed; a first protrusion that continuously contacts the first side surface in the circumferential direction; a second protrusion that continuously contacts the second side surface in the circumferential direction; has The biasing portion includes a plurality of contact portions that are provided intermittently along the circumferential direction and contact the groove bottom surface.
  • the followability of the packing to the labyrinth ring is improved.
  • FIG. 1 is a sectional view showing an example of a rolling bearing device.
  • FIG. 2 is a sectional view showing a part of the first axial side of the rolling bearing device shown in FIG. 1.
  • FIG. 3 is a sectional view illustrating the packing and the first seal groove.
  • FIG. 4 is a sectional view of the packing.
  • FIG. 5 is a sectional view showing a modification (1) of the packing.
  • FIG. 6 is a sectional view showing a modified example (2) of the packing.
  • FIG. 7 is a sectional view showing a modified example (3) of the packing.
  • FIG. 8 is a sectional view of a conventional packing.
  • the rolling bearing device of the present disclosure includes: A pestle-shaped roll, an axle box, an inner ring that rotates integrally with the pestle-shaped roll and has an inner ring raceway; an outer ring having an outer ring raceway facing the inner ring raceway and attached to the axle box; a plurality of rollers disposed between the inner ring raceway and the outer ring raceway; a labyrinth ring attached to the axle box so as to be radially opposed to an axial end of the inner ring; a packing attached to the inner ring and slidingly in contact with the labyrinth ring; an oil seal attached to the inner ring and slidingly in contact with the labyrinth ring; Equipped with The pestle-shaped roll has a small diameter shaft portion to which the inner ring is attached, and two large diameter portions having a larger diameter than the small diameter shaft portion, A first seal groove to which the packing is attached, and a second seal groove to which the oil seal is attached are provided on the outer periphery of the inner
  • the packing is a cylindrical portion that slides into contact with the labyrinth ring; a biasing portion provided on the radially inner side of the cylindrical portion and capable of being elastically deformed; a first protrusion that continuously contacts the first side surface in the circumferential direction; a second protrusion that continuously contacts the second side surface in the circumferential direction; has The biasing portion includes a plurality of contact portions that are provided intermittently along the circumferential direction and contact the groove bottom surface.
  • the packing is interposed between the groove bottom surface and the labyrinth ring in a state where the urging portion is elastically compressed and deformed in the radial direction.
  • the cylindrical portion follows and contacts the labyrinth ring.
  • the contact portions of the biasing portion are provided intermittently along the circumferential direction. Therefore, for example, when the biasing part is greatly compressed in the radial direction with respect to the first seal groove, a part of the biasing part can be elastically deformed to escape in the circumferential direction. Therefore, the load on the biasing section is smaller than that of the prior art biasing section.
  • the packing can follow and contact the labyrinth ring, and the interference between the packing and the labyrinth ring is suppressed from becoming small.
  • the contact portion is provided intermittently along the circumferential direction, and the biasing portion has a range that does not come into contact with the groove bottom surface. Therefore, the first protrusion portion continuously contacts the first side surface in the circumferential direction, and the second protrusion portion continuously contacts the second side surface in the circumferential direction. Therefore, the space between the first seal groove and the packing has sealing performance.
  • the biasing portion has a non-contact portion that connects the two circumferentially adjacent contact portions and is not in contact with the groove bottom surface.
  • the biasing part and the cylindrical part are strongly joined.
  • the biasing section having a plurality of contact sections provided intermittently is unlikely to fall off from the cylindrical section.
  • the contact part has a radially outer part fixed to the cylindrical part and a radially inner part that is integral with the radially outer part, and the radially inner part is , having two support parts that extend separately from the radially outer part to both sides in the circumferential direction and contact the groove bottom surface, and a gap is formed between the two support parts and the groove bottom surface.
  • the two support parts deform elastically.
  • the packing becomes easier to elastically deform and follows the labyrinth ring.
  • the contact portion includes a radially outer portion fixed to the cylindrical portion and a radially outer portion that is integral with the radially outer portion.
  • the radially inner portion has a circumferential dimension that changes along the radial direction. In this case, a portion of the contact portion having a small circumferential dimension is likely to be elastically deformed, and the packing may easily follow the labyrinth ring.
  • the inner ring is a split raceway ring
  • the outer ring has a convex portion along a spherical surface on its outer circumferential side.
  • the axle box includes a first axle box member having a concave portion along a spherical surface on which the convex portion is slidable, and a second axle box member that is combined with the first axle box member.
  • a bearing unit including an inner ring, a plurality of rollers, an outer ring, and an axle box is located on the outer circumferential side of a small-diameter shaft portion of a punch-type roll, and the punch-type roll is Supported by an axle box.
  • FIG. 1 is a sectional view showing an example of a rolling bearing device 10.
  • the rolling bearing device 10 is a device that includes a punch-shaped roll 3 and a bearing unit 19.
  • the bearing unit 19 includes an inner ring 11, an outer ring 15, a plurality of cylindrical rollers (rolling elements) 13, a labyrinth ring 31, a packing 32, an oil seal 33, and an axle box 14.
  • the bearing unit 19 supports the punch type roll 3.
  • the punch-shaped roll 3 is used in a continuous casting machine.
  • the punch-type roll 3 and another opposing punch-type roll sandwich and move the slab.
  • the punch type roll 3 casts the moving slab while compressing it.
  • the pestle-shaped roll 3 integrally includes a central small-diameter shaft portion 4 and two large-diameter portions 5, 5 provided on both sides of the small-diameter shaft portion 4 in the axial direction.
  • the large diameter portion 5 has a larger diameter than the small diameter shaft portion 4.
  • the pestle-shaped roll 3 has a small diameter shaft portion 4 supported by a bearing unit 19.
  • the direction parallel to the central axis L1 is the axial direction of the rolling bearing device 10.
  • a direction parallel to the central axis L1 is simply referred to as an "axial direction.”
  • the direction perpendicular to the central axis L1 is the radial direction of the rolling bearing device 10.
  • the direction perpendicular to the central axis L1 is simply referred to as the "radial direction.”
  • the direction along the circle centered on the central axis L1 is the circumferential direction of the rolling bearing device 10.
  • FIG. 1 is a sectional view taken in a plane including the central axis L1 and a vertical direction.
  • the rolling bearing device 10 has a symmetrical configuration between a first axial side and a second axial side at the axial center of the small diameter shaft portion.
  • the labyrinth ring 31, the packing 32, and the oil seal 33 are arranged on both sides of the rolling bearing device 10 in the axial direction.
  • the labyrinth ring 31, packing 32, and oil seal 33 on the first axial side have the same configuration as those on the second axial side, and are arranged symmetrically.
  • the axle box 14 has a two-part structure divided into upper and lower parts.
  • the axle box 14 has a first axle box member 17 fixed to a common base plate of the casting machine segment, and a second axle box member 18 placed on the first axle box member 17.
  • the first axle box member 17 and the second axle box member 18 are connected and fixed by bolts or the like not shown.
  • the first axle box member 17 has a concave and spherical inner surface 17a on its upper surface side.
  • the first axle box member 17 is an alignment ring.
  • the outer ring 15 has a configuration in which an alignment outer ring is divided in half along a plane including its central axis.
  • the inner peripheral surface of the outer ring 15 has a shape along a cylindrical surface centered on the central axis L1.
  • the inner peripheral surface of the outer ring 15 has an outer ring raceway 15c.
  • the outer ring 15 has a convex spherical outer diameter surface 15d.
  • the spherical outer diameter surface 15d is able to abut and slide on the concave and spherical inner surface 17a.
  • the second axle box member 18 is a member above the axle box 14.
  • the inner peripheral surface of the second axle box member 18 has a shape along a cylindrical surface centered on the central axis L1.
  • the inner peripheral surface of the second axle box member 18 has an outer ring raceway 18c.
  • the inner ring 11 is attached to the small diameter shaft portion 4 by being fitted onto the outside of the small diameter shaft portion 4 .
  • the inner ring 11 rotates together with the pestle-shaped roll 3.
  • the inner ring 11 is a two-split bearing ring.
  • the inner ring 11 has a first inner ring segment 11a and a second inner ring segment 11b each having a semi-cylindrical shape.
  • the dividing surfaces of these inner ring division bodies 11a and 11b are on a plane containing the central axis of the inner ring 11.
  • the inner ring segments 11a and 11b are connected and fixed by bolts or the like (not shown) to form an integral cylindrical member (inner ring 11).
  • the inner ring 11 has a cylindrical inner ring raceway 11c on its outer peripheral side.
  • the inner ring 11 has flanges 20, 20 having a larger diameter than the inner ring raceway 11c on both sides of the inner ring raceway 11c in the axial direction.
  • the inner raceway 11c and the outer raceways 15c and 18c face each other in the radial direction.
  • the rollers 13 are arranged between the inner ring raceway 11c and the outer ring raceways 15c and 18c. As the pestle-shaped roll 3 rotates together with the inner ring 11 relative to the outer ring 15 and the axle box 14, the rollers 13 roll on the inner ring raceway 11c and the outer ring raceways 15c, 18c.
  • FIG. 2 is a sectional view showing a part of the first axial side of the rolling bearing device 10 shown in FIG. 1.
  • the diameter of the outer peripheral surface 20a of the collar 20 of the inner ring 11 is larger than the diameter of the inner ring raceway 11c.
  • a first seal groove 71 and a second seal groove 72 are provided on the outer peripheral surface 20a of the collar 20.
  • the first seal groove 71 and the second seal groove 72 are each annular grooves.
  • the seal grooves 71 and 72 are recessed radially inward from the outer peripheral surface 20a.
  • the first seal groove 71 is a groove for attaching the packing 32
  • the second seal groove 72 is a groove for attaching the oil seal 33.
  • FIG. 3 is a cross-sectional view illustrating the packing 32 and the first seal groove 71.
  • the first seal groove 71 includes a first side surface 66 that is annular, a second side surface 67 that is annular and opposite to the first side surface 66 in the axial direction, and a first side surface 66 and a second side surface 67. and a groove bottom surface 68 provided between the groove bottom surface 68 and the groove bottom surface 68.
  • the first side surface 66 is an annular plane extending radially inward from a portion of the outer circumferential surface 20a of the inner ring 11.
  • the second side surface 67 is an annular plane extending radially inward from the other portion of the outer peripheral surface 20a of the inner ring 11.
  • the groove bottom surface 68 is a cylindrical surface that extends in the axial direction from the radially inner end of the first side surface 66 and is connected to the radially inner end of the second side surface 67 .
  • the groove bottom surface 68 is a cylindrical surface centered on the central axis of the inner ring 11.
  • the groove bottom surface 68 may be a conical surface or a part of a torus other than the above-mentioned cylindrical surface.
  • the labyrinth ring 31 (see FIG. 1) is a generally cylindrical member.
  • the labyrinth ring 31 is divided into two parts in the circumferential direction.
  • the labyrinth ring 31 has a first semi-cylindrical portion 31a and a second semi-cylindrical portion 31b.
  • the dividing planes of these half-cylindrical parts 31a and 31b lie on a plane that includes the central axis of the labyrinth ring 31.
  • the central axis of the labyrinth ring 31 coincides with the central axis of the outer ring 15.
  • a first half-cylindrical portion 31a constituting the lower half of the labyrinth ring 31 is attached to the first axle box member 17.
  • the second half-cylindrical portion 31b constituting the upper half of the labyrinth ring 31 is attached to the second axle box member 18.
  • the labyrinth ring 31 faces the axial end (flange 20) of the inner ring 11 in the radial direction.
  • the labyrinth ring 31 on the first axial side (the right side in FIG. 1) is provided to protrude from the axle box 14 toward the first axial side.
  • a portion 31c of the labyrinth ring 31 enters the concave circumferential groove 6 formed in the large diameter portion 5 of the punch-shaped roll 3.
  • the labyrinth ring 31 on the second axial side (the left side in FIG. 1) is provided to protrude from the axle box 14 toward the second axial side.
  • a portion 31c of the labyrinth ring 31 enters the concave circumferential groove 6 formed in the large diameter portion 5 of the punch-shaped roll 3.
  • a labyrinth gap is formed between a portion 31c of the labyrinth ring 31 and the concave circumferential groove 6 on both sides in the axial direction.
  • the labyrinth gap prevents foreign matter such as cooling water from entering the bearing interior 16 from the outside.
  • the oil seal 33 includes a fixing portion 52, lips 53, 54, and a metal ring 55.
  • the fixing portion 52 and lips 53, 54 are made of rubber.
  • the fixing portion 52 and the lips 53, 54 are integral.
  • the fixing portion 52 and the lips 53, 54 are annular.
  • the fixing portion 52 and the lips 53, 54 are separated at one location in the circumferential direction.
  • the metal ring 55 has two arc-shaped metal plates. The metal rings 55 are each fixed to a portion of the fixing portion 52 on a first side in the circumferential direction from the separation location and a portion on a second side in the circumferential direction from the separation location.
  • the oil seal 33 is fitted into the second seal groove 72 and attached.
  • the oil seal 33 has a ring shape as a whole when attached to the inner ring 11. Since the oil seal 33 is separated at one location in the circumferential direction, it can be attached to the inner ring 11 having a smaller diameter than the large diameter portion 5 of the punch type roll 3. When the pestle-shaped roll 3 and the inner ring 11 rotate, the oil seal 33 rotates together with the inner ring 11. The lip portions 53 and 54 of the oil seal 33 slide into contact with the inner peripheral surface 31d of the labyrinth ring 31.
  • the packing 32 includes a cylindrical portion 40 , a biasing portion 41 , a first protrusion 46 , and a second protrusion 47 .
  • the cylindrical portion 40 is annular.
  • the cylindrical portion 40 is separated at one location in the circumferential direction. With the packing 32 attached to the first seal groove 71, the separated end portions of the cylindrical portion 40 are pressed against each other in the circumferential direction.
  • the cylindrical portion 40 is made of resin.
  • the cylindrical portion 40 may be made of rubber instead of resin.
  • the cylindrical portion 40 is preferably made of resin.
  • the cylindrical portion 40 is made of polytetrafluoroethylene.
  • FIG. 4 is a cross-sectional view of the packing 32, showing a cross section taken in the direction of the IV arrow in FIG.
  • the groove bottom surface 68 of the first seal groove 71 is shown by a two-dot chain line.
  • the urging section 41 has a plurality of contact sections 42 and a plurality of non-contact sections 43.
  • the contact portions 42 and non-contact portions 43 are arranged alternately in the circumferential direction.
  • the contact portion 42 contacts the groove bottom surface 68.
  • the non-contact portion 43 connects two circumferentially adjacent contact portions 42, 42.
  • the non-contact portion 43 does not contact the groove bottom surface 68.
  • Contact portions 42 , 42 adjacent in the circumferential direction are connected by a non-contact portion 43 .
  • the biasing portion 41 of this embodiment has an annular shape as a whole. At one separation point in the circumferential direction where the cylindrical portion 40 separates, the biasing portion 41 is also separated in the circumferential direction.
  • the biasing portion 41 is made of rubber and is elastically deformable.
  • the biasing portion 41, the first protrusion 46, and the second protrusion 47 are integrally formed.
  • the biasing portion 41, the first protrusion 46, and the second protrusion 47 are annular.
  • the biasing portion 41, the first protruding portion 46, and the second protruding portion 47 are separated at the same location where the cylindrical portion 40 is separated.
  • the biasing portion 41, the first protrusion 46, and the second protrusion 47 are made of rubber.
  • the biasing portion 41, the first protrusion 46, and the second protrusion 47 are made of fluororubber.
  • the biasing portion 41 is fixed to the inside of the cylindrical portion 40 in the radial direction.
  • the biasing portion 41 is bonded to the cylindrical portion 40 with, for example, an adhesive.
  • the outer circumferential surface 40a of the cylindrical portion 40 is a cylindrical surface.
  • a recess 40b is provided on the inner peripheral side of the cylindrical portion 40. A portion of the biasing portion 41 has entered the recess 40b. With this configuration, the cylindrical portion 40 and the biasing portion 41 are strongly joined.
  • the first protruding portion 46 is located on the side surface 41a of the biasing portion 41 on the first axial side.
  • the second protruding portion 47 is located on the side surface 41b of the biasing portion 41 on the second axial side.
  • the first protruding portion 46 is located on the first axial side of the cylindrical portion 40 and the biasing portion 41 .
  • the second protruding portion 47 is located on the second axial side of the cylindrical portion 40 and the biasing portion 41 .
  • the first protrusion 46 is provided in an annular shape on the side surface 41a of the biasing portion 41.
  • the first protrusion 46 continuously contacts the first side surface 66 in the circumferential direction.
  • the first protruding portion 46 is located on the first side in the axial direction from the side surface 41a of the biasing portion 41.
  • the second protruding portion 47 is provided in an annular shape on the side surface 41b of the biasing portion 41.
  • the second protrusion 47 continuously contacts the second side surface 67 in the circumferential direction.
  • the second protruding portion 47 is located on the second axial side of the side surface 41b of the biasing portion 41.
  • the first protruding portion 46 and the second protruding portion 47 are integrally molded with the biasing portion 41.
  • the axial dimension of the cylindrical portion 40 and the axial dimension of the biasing portion 41 are the same.
  • the axial dimension of the radially outer part 41j of the urging part 41 that includes the joint part with the cylindrical part 40, and the axial dimension of the radially inner part 41s of the urging part 41 that contacts the groove bottom surface 68. are the same.
  • the axial dimension of the radially outer portion 41j is the dimension of the portion excluding the first protrusion 46 and the second protrusion 47.
  • the packing 32 is fitted and attached to the first seal groove 71.
  • the packing 32 has an annular shape as a whole when attached to the inner ring 11. Since the packing 32 is separated at one point in the circumferential direction, it can be attached to the inner ring 11 having a smaller diameter than the large diameter portion 5 of the punch-shaped roll 3.
  • the urging portion 41 is radially compressed and elastically deformed between the cylindrical portion 40 and the groove bottom surface 68 at the contact portion 42 .
  • the contact portion 42 presses the cylindrical portion 40 against the labyrinth ring 31 .
  • the packing 32 rotates together with the inner ring 11.
  • the cylindrical portion 40 slides into contact with the inner circumferential surface 31d of the labyrinth ring 31.
  • Packing 32 and oil seal 33 contact labyrinth ring 31.
  • the sealing performance of the packing 32, the oil seal 33, and the labyrinth ring 31 prevents cooling water and casting scale from entering from the outside of the rolling bearing device 10 into the bearing interior 16 where the plurality of rollers 10 are present.
  • the oil seal 33 also has the function of preventing lubricant such as grease or oil/air oil inside the bearing 16 from leaking to the outside.
  • each contact portion 42 has a radially outer part 41j on the radially outer side and a radially inner part 41s on the radially inner side.
  • the radially outer portion 41j is connected to the non-contact portion 43.
  • the radially outer portion 41j is integrated with the non-contact portion 43 to form an annular shape.
  • a plurality of radially inner portions 41s exist in the circumferential direction.
  • the radially inner portions 41s are provided intermittently (intermittently) in the circumferential direction.
  • the radially inner portions 41s that are adjacent to each other in the circumferential direction are separated from each other in the circumferential direction.
  • the radially inner portion 41s is integrated with the radially outer portion 41j.
  • the radially inner portion 41s contacts the groove bottom surface 68.
  • the radially inner portion 41s has a first support portion 44 and a second support portion 45.
  • the first support portion 44 is provided extending from the radially outer portion 41j to the first side in the circumferential direction and radially inward.
  • the second support portion 45 is provided extending from the radially outer portion 41j to the second side in the circumferential direction and radially inward.
  • the tip 44 a of the first support portion 44 and the tip 45 a of the second support portion 45 contact the groove bottom surface 68 .
  • the distal end portion 44a of the first support portion 44 and the distal end portion 45a of the second support portion 45 are separated from each other in the circumferential direction.
  • the state in which the packing 32 is mounted in the first seal groove 71 and the cylindrical portion 40 is in contact with the labyrinth ring 31 is referred to as the "packing 32 mounted state.”
  • the packing 32 is attached, the first support portion 44 is compressed in the radial direction, and the tip portion 44a moves toward the first side in the circumferential direction.
  • the second support portion 45 is compressed in the radial direction, and the tip portion 45a moves toward the second side in the circumferential direction.
  • the first support part 44 and the second support part 45 are pulled apart in the circumferential direction.
  • a gap E exists between the first support portion 44 and the second support portion 45 and between the groove bottom surface 68.
  • a space P exists inside the non-contact portion 43 in the radial direction.
  • the contact portion 42 is compressed in the radial direction and elastically deforms.
  • the contact portion between the tip portion 44a and the groove bottom surface 68 moves toward the first side (space P side) in the circumferential direction.
  • the contact portion (contact area) between the tip portion 44a and the groove bottom surface 68 expands to the second side (gap E side) in the circumferential direction.
  • the contact portion between the tip portion 45a and the groove bottom surface 68 moves to the second side (space P side) in the circumferential direction.
  • the contact portion (contact area) between the tip portion 45a and the groove bottom surface 68 expands toward the first side (gap E side) in the circumferential direction.
  • the radially inner portion 41s can expand toward the space P or the gap E.
  • the contact portion 42 is compressed in the radial direction, and the radially inner portion 41s can escape into the space P or the gap E. Therefore, the cylindrical portion 40 can be easily moved in the radial direction.
  • the first protrusion 46 contacts the first side surface 66 with an interference margin.
  • the second protrusion 47 contacts the second side surface 67 with an interference margin.
  • the first protrusion 46 can move in the radial direction while remaining in contact with the first side surface 66.
  • the second protrusion 47 can move in the radial direction while contacting the second side surface 67.
  • FIG. 5 is a sectional view showing a modified example (1) of the packing 32.
  • the biasing portion 41 includes a contact portion 42 and a non-contact portion 43, and a plurality of contact portions 42 are provided intermittently along the circumferential direction, and each contact portion 42 contacts the groove bottom surface 68.
  • the non-contact portion 43 connects the two circumferentially adjacent contact portions 42, 42, and the non-contact portion 43 does not contact the groove bottom surface 68; They are the same in that they have a direction inner part 41s.
  • the radially inner portion 41s contacts the groove bottom surface 68 at two locations: the first support portion 44 and the second support portion 45.
  • the number of contact portions of the radially inner portion 41s with the groove bottom surface 68 is one.
  • the radially inner portion 41s has a shape in which the circumferential dimension decreases from the radially outer portion 41j toward the groove bottom surface 68.
  • the urging portion 41 can be easily molded (demolded).
  • the contact portion 42 is compressed in the radial direction and is elastically deformed. At this time, the radially inner portion 41s can expand toward the space P.
  • FIG. 6 is a sectional view showing a modified example (2) of the packing 32.
  • the number of contact portions of the radially inner portion 41s with the groove bottom surface 68 is one.
  • Modification (2) shown in FIG. 6 differs from Modification (1) shown in FIG. 5 in the form of the radially inner portion 41s.
  • the radially inner portion 41s has a shape whose circumferential dimension increases toward the groove bottom surface 68.
  • the contact portion 42 with the groove bottom surface 68 becomes large, the packing 32 is unlikely to be displaced from the inner ring 11 in the circumferential direction.
  • the contact portion 42 is compressed in the radial direction and is elastically deformed. At this time, the radially inner portion 41s can expand toward the space P.
  • the circumferential dimension of the contact portion 42 changes along the radial direction of the contact portion 42.
  • the contact portion 42 has, at least in part, a radially inner portion 41s whose circumferential dimension changes along the radial direction.
  • FIG. 7 is a sectional view showing a modification (3) of the packing 32.
  • the radially inner portion 41s contacts the groove bottom surface 68 at one location.
  • Modification (3) differs from Modification (1) and Modification (2) in the form of the radially inner portion 41s.
  • a surface 49a on the first side in the circumferential direction of the radially inner portion 41s and a surface 49b on the second side in the circumferential direction of the radially inner portion 41s are parallel.
  • the first side surface 49a and the second side surface 49b are parallel to the axial direction.
  • a virtual plane is located along the radial direction at the center of the first side surface 49a and the second side surface 49b.
  • the dimension in the circumferential direction (tangential direction) between the first side surface 49a and the second side surface 49b does not change. That is, the tangential dimension of the radially inner portion 41s is constant along the radial extending direction of the radially inner portion 41s.
  • the contact portion 42 is compressed in the radial direction and is elastically deformed. At this time, the radially inner portion 41s can expand toward the space P.
  • the cross-sectional shape of the contact portion 42 of the packing 32 in each of the embodiments of FIGS. 5, 6, and 7 is the same as the shape shown in FIG. 3.
  • the packing 32 in each of the embodiments of FIGS. 5, 6, and 7 also has a first protrusion 46 and a second protrusion 47 that are annular.
  • the rolling bearing device 10 of each of the above embodiments includes the packing 32 that is attached to the inner ring 11 and slides into contact with the labyrinth ring 31.
  • Each type of packing 32 includes a cylindrical portion 40 that slides into contact with the labyrinth ring 31 , a biasing portion 41 that is provided inside the radial direction of the cylindrical portion 40 and is elastically deformable, and a first portion of the first seal groove 71 .
  • a first protrusion 46 that continuously contacts the side surface 66 in the circumferential direction; and a second protrusion 47 that continuously contacts the second side surface 67 of the first seal groove 71 in the circumferential direction. and has.
  • the biasing section 41 has a plurality of contact sections 42 .
  • the plurality of contact portions 42 are provided intermittently along the circumferential direction and contact the groove bottom surface 68 of the first seal groove 71 .
  • the packing 32 is interposed between the groove bottom surface 68 and the labyrinth ring 31 in a state where the urging portion 41 is elastically compressed and deformed in the radial direction.
  • the biasing portion 41 is elastically compressed and deformed in the radial direction, and a state in which the cylindrical portion 40 follows and contacts the labyrinth ring 31 is obtained.
  • the contact portions 42 of the biasing portion 41 are provided intermittently along the circumferential direction. Therefore, in the first seal groove 71, even if the biasing portion 41 is largely compressed in the radial direction, a portion of the biasing portion 41 will not be elastically deformed to escape in the circumferential direction.
  • the load on the biasing portion 41 is less than that on the packing of the conventional structure.
  • the packing 32 can follow and contact the labyrinth ring 31, and a decrease in the interference between them is suppressed.
  • the contact portions 42 are provided intermittently (intermittently) along the circumferential direction, and there is a range in the biasing portion 41 that does not come into contact with the first seal groove 71 .
  • the first protrusion 46 continuously contacts the first side surface 66 of the first seal groove 71 in the circumferential direction.
  • the second protrusion 47 continuously contacts the second side surface 67 of the first seal groove 71 in the circumferential direction. Therefore, the sealing performance between the first seal groove 71 and the packing 32 is ensured.
  • the biasing portion 41 further includes a non-contact portion 43 that connects two circumferentially adjacent contact portions 42 and 42 and does not contact the groove bottom surface 68. Therefore, the joining area between the biasing part 41 and the cylindrical part 40 expands along the circumferential direction, and even if the biasing part 41 and the cylindrical part 40 are made of different materials, they are strongly joined. In other words, the biasing part 41 having a plurality of contact parts 42 provided intermittently becomes difficult to fall off from the cylindrical part 40.
  • the contact portion 42 has a radially outer portion 41j fixed to the cylindrical portion 40, and a radially inner portion 41s that is integral with the radially outer portion 41j.
  • the radially inner portion 41s has two support portions 44 and 45.
  • the support portions 44 and 45 extend separately from the radially outer portion 41j on both sides in the circumferential direction and contact the groove bottom surface 78.
  • the contact part 42 becomes elastic in the radial direction.
  • the two supports 44 and 45 also deform.
  • the packing 32 has a larger elastically deformable size and can easily follow the labyrinth ring 31.
  • the contact portion 42 has a radially outer portion 41j fixed to the cylindrical portion 40, and a radially inner portion 41s that is integral with the radially outer portion 41j.
  • the circumferential dimension of the radially inner portion 41s changes along the radial direction.
  • the contact portion 42 tends to be elastically deformed in a portion having a small circumferential dimension. Therefore, the packing 32 shown in FIGS. 5 and 6 is easier to follow than the packing 32 shown in FIG. 7. In the embodiments shown in FIGS. 5, 6, and 7, the packing 32 can be followed by elastic deformation of the entire contact portion 42 in the radial direction.
  • the shape of contact portion 42 may vary within the scope of this disclosure.
  • the circumferential dimension of the radially inner portion 41s changes linearly along the radial direction of the contact portion 42.
  • the side surface of the radially inner portion 41s facing in the circumferential direction is a flat surface.
  • the circumferential dimension of the radially inner portion 41s may change non-linearly along the radial direction of the contact portion 42.
  • the packing of the rolling bearing device of the present invention may be a packing 32 that combines at least two of the contact portions 42 shown in FIGS. 4, 5, 6, and 7.

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)
  • Support Of The Bearing (AREA)
PCT/JP2022/026976 2022-07-07 2022-07-07 転がり軸受装置 Ceased WO2024009459A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PCT/JP2022/026976 WO2024009459A1 (ja) 2022-07-07 2022-07-07 転がり軸受装置
CN202280096057.9A CN119213232A (zh) 2022-07-07 2022-07-07 滚动轴承装置
KR1020257003557A KR20250034425A (ko) 2022-07-07 2022-07-07 구름 베어링 장치
JP2024531848A JPWO2024009459A1 (https=) 2022-07-07 2022-07-07
DE112022007498.1T DE112022007498T5 (de) 2022-07-07 2022-07-07 Walzlagenvorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/026976 WO2024009459A1 (ja) 2022-07-07 2022-07-07 転がり軸受装置

Publications (1)

Publication Number Publication Date
WO2024009459A1 true WO2024009459A1 (ja) 2024-01-11

Family

ID=89453096

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/026976 Ceased WO2024009459A1 (ja) 2022-07-07 2022-07-07 転がり軸受装置

Country Status (5)

Country Link
JP (1) JPWO2024009459A1 (https=)
KR (1) KR20250034425A (https=)
CN (1) CN119213232A (https=)
DE (1) DE112022007498T5 (https=)
WO (1) WO2024009459A1 (https=)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH066751U (ja) * 1992-06-30 1994-01-28 エヌティエヌ株式会社 分割形転がり軸受のシール装置
JP2004278738A (ja) * 2003-03-18 2004-10-07 Koyo Seiko Co Ltd 軸受ユニット
JP2006071058A (ja) * 2004-09-06 2006-03-16 Nok Corp 密封装置
JP2017190835A (ja) * 2016-04-14 2017-10-19 株式会社ジェイテクト 軸受装置及び密封装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH066751U (ja) * 1992-06-30 1994-01-28 エヌティエヌ株式会社 分割形転がり軸受のシール装置
JP2004278738A (ja) * 2003-03-18 2004-10-07 Koyo Seiko Co Ltd 軸受ユニット
JP2006071058A (ja) * 2004-09-06 2006-03-16 Nok Corp 密封装置
JP2017190835A (ja) * 2016-04-14 2017-10-19 株式会社ジェイテクト 軸受装置及び密封装置

Also Published As

Publication number Publication date
JPWO2024009459A1 (https=) 2024-01-11
CN119213232A (zh) 2024-12-27
DE112022007498T5 (de) 2025-05-15
KR20250034425A (ko) 2025-03-11

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