WO2022065194A1 - Roulement à billes et poulie - Google Patents

Roulement à billes et poulie Download PDF

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Publication number
WO2022065194A1
WO2022065194A1 PCT/JP2021/034118 JP2021034118W WO2022065194A1 WO 2022065194 A1 WO2022065194 A1 WO 2022065194A1 JP 2021034118 W JP2021034118 W JP 2021034118W WO 2022065194 A1 WO2022065194 A1 WO 2022065194A1
Authority
WO
WIPO (PCT)
Prior art keywords
axial
slinger
inner ring
labyrinth
bearing
Prior art date
Application number
PCT/JP2021/034118
Other languages
English (en)
Japanese (ja)
Inventor
貴裕 和久田
隼人 川口
Original Assignee
Ntn株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2022065194A1 publication Critical patent/WO2022065194A1/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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/32—Friction members
    • F16H55/36—Pulleys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
    • F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
    • F16J15/3256—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals
    • 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 invention relates to ball bearings and pulleys.
  • vehicles may be used under submerged driving, and dirt such as mud adhering to the surroundings of the engine room may be cleaned with high-pressure water.
  • Vehicles may be used in harsh environments that are not expected in the Japanese market. Therefore, in order to prevent foreign matter such as muddy water from entering the inside of the bearing of the pulley that drives the auxiliary equipment of the engine, measures such as covering the pulley itself with a cover may be taken.
  • the bearing shown in Patent Document 1 is provided with a bearing sealing device composed of an inner ring side slinger and a sliding seal portion at both ends in the axial direction of the rolling element arrangement space formed between the inner and outer rings. (See paragraphs 0017 to 0021 of Patent Document 1, FIG. 2 and the like).
  • the inner ring side slinger is arranged so as to block the annular opening of the rolling element placement space in the axial direction, and the inner peripheral edge portion in the radial direction is fitted to the axial end portion of the inner ring so as not to rotate relative to each other. Further, the sliding seal portion is arranged to face the inner ring side slinger so as to form an axial seal gap inside in the axial direction.
  • the outer peripheral edge in the radial direction is fitted to the axial end of the outer ring so as not to rotate relative to each other, and a main seal lip is formed on the inner peripheral edge side in the radial direction so as to be in sliding contact with the outside of the axial end of the inner ring.
  • a sub-seal lip is formed so as to rise diagonally in the radial direction while crossing the axial seal gap from the axial base surface, and the tip of the sub-seal lip is the inner ring. It is in sliding contact with the inner surface of the side slinger in the axial direction.
  • the inner ring the outer ring arranged coaxially with the inner ring on the outer peripheral side of the inner ring, the ball interposed between the inner ring and the outer ring, and the inner ring.
  • a seal member that seals the bearing internal space formed between the outer ring and the outer ring of the bearing with respect to the outside of the bearing, and a slinger provided on the axially outer side of the seal member.
  • the slinger has an annular protrusion extending axially from the base portion toward the slinger, and the slinger has an annular flat portion along the base portion and a non-annular projection corresponding to the formation position of the annular projection.
  • a ball bearing was constructed in which an axial labyrinth extending to was formed.
  • the circumferential cross section of the slinger has an S-shape, and the inner peripheral side thereof is fitted to the outer peripheral surface of the axial end portion of the inner ring.
  • a labyrinth extending in the axial direction can be further formed between the inner peripheral surface of the axial end of the outer ring and the outer peripheral side of the slinger, so that the bearing can be further formed.
  • the effect of preventing foreign matter from entering from the end of the bearing can be further enhanced.
  • the radial labyrinth has an axial width of 0.2 to 1.0 mm and the axial labyrinth has a radial width of 0.1 to 0.5 mm.
  • the ball bearings according to each of the above configurations can be applied to pulleys.
  • This ball bearing reduces the torque of the bearing while ensuring the effect of preventing foreign matter from entering, so it is particularly applicable to pulleys that drive auxiliary equipment for vehicle engines that are susceptible to foreign matter such as muddy water. Are suitable.
  • the seal member and the slinger are formed by forming an annular protrusion on the seal member as described above and forming a step portion on the slinger that bends in the axial direction so as to maintain a non-contact state with the annular protrusion.
  • a complex labyrinth consisting of a radial labyrinth extending in the radial direction and an axial labyrinth extending in the axial direction was constructed between the two. Therefore, it is possible to reduce the torque of the bearing while preventing foreign matter from entering the inside of the bearing. Further, since both the seal member and the slinger are easy to mold and easy to assemble, the manufacturing cost can be suppressed.
  • a vertical sectional view showing an embodiment of a ball bearing according to the present invention A vertical sectional view showing a main part of the ball bearing shown in FIG.
  • the ball bearing 10 includes an inner ring 11, an outer ring 12 arranged coaxially with the inner ring 11 on the outer peripheral side of the inner ring 11, and a ball 13 interposed between the inner ring 11 and the outer ring 12. It includes a seal member 14 that seals the bearing internal space formed between the inner ring 11 and the outer ring 12 with respect to the outside of the bearing, and a slinger 15 provided on the axially outer side of the seal member 14.
  • the ball bearing 10 is suitable for an outer ring rotation type bearing, such as a bearing applied to a pulley for driving an auxiliary machine of an engine, which will be described later, but may also be applied to an inner ring rotation type bearing.
  • the direction of the ball bearing 10 along the bearing central axis C is referred to as an "axial direction”, and this direction corresponds to the left-right direction in FIG.
  • the direction perpendicular to the bearing central axis C is referred to as a “diametrical direction”, and this direction corresponds to the vertical direction in FIG.
  • the circumferential direction around the bearing central axis C is referred to as "circumferential direction”.
  • the inner ring 11 is an annular member having an inner ring track 16 formed on the outer periphery thereof and a through hole 18 through which a pulley boss portion 17 (see FIG. 3) is inserted at the center in the axial direction.
  • Seal sliding surfaces 19 that rotate relative to the seal member 14 are formed at both ends of the outer circumference of the inner ring 11 in the axial direction over the entire circumference in the circumferential direction.
  • the outer ring 12 is an annular member having an outer ring track 20 formed on the inner circumference. Seal grooves 21 are formed at both ends of the inner circumference of the outer ring 12 in the axial direction.
  • the seal member 14 is attached to the outer ring 12 by press-fitting the outer peripheral edge of the seal member 14 into the seal groove 21.
  • the ball 13 is guided by the inner ring track 16 and the outer ring track 20 and rolls in the circumferential direction.
  • the balls 13 are held by the cage 22, and a predetermined interval is secured between the balls 13.
  • the cage 22 is a rolling element guide type cage 22 guided by a ball 13.
  • the seal member 14 has an annular base portion 23, an annular protrusion 24 extending axially from the base portion 23 toward the slinger 15, and an annular core metal 25.
  • a press-fit end 26 is formed on the outer peripheral edge of the base portion 23, and a seal lip 27 is formed on the inner peripheral edge of the base portion 23.
  • the base 23 and the annular protrusion 24 are made of rubber such as nitrile rubber, fluororubber, silicone rubber, and acrylic rubber.
  • the annular protrusion 24 is an upright surface extending straight along the axial direction on the bearing outer diameter side, whereas it is an inclined surface extending inclined with respect to the axial direction on the bearing inner diameter side.
  • the annular protrusion 24 is an upright surface extending straight along the axial direction on the bearing outer diameter side, whereas it is an inclined surface extending inclined with respect to the axial direction on the bearing inner diameter side.
  • the core metal 25 is an annular metal plate.
  • the core metal 25 is formed, for example, by pressing a steel plate.
  • the seal member 14 maintains a predetermined shape.
  • the seal member 14 attached to the outer ring 12 is in contact with the seal sliding surface 19 on the entire circumference in the circumferential direction at the seal lip 27, and the inner space of the bearing is partitioned so as to be sealed from the outside of the bearing with the seal member 14 as a boundary. There is. This prevents the leakage of lubricant such as grease sealed in the bearing internal space and the intrusion of foreign matter from the outside of the bearing.
  • the slinger 15 is a metal member having an S-shaped cross section in the circumferential direction.
  • the slinger 15 keeps a non-contact state with the annular flat portion 28 along the base 23 of the seal member 14 and the annular projection 24 formed on the seal member 14 in a non-contact state.
  • a stepped portion 29 that bends in the axial direction and a protruding portion 30 that has a surface parallel to the flat portion 28 and protrudes outward in the axial direction so as to include the annular protrusion 24 are continuously formed.
  • an outer peripheral flange 31 is formed on the outer peripheral side of the slinger 15, and an inner peripheral flange 32 is formed on the inner peripheral side.
  • the slinger 15 is attached to the inner ring 11 by press-fitting the inner peripheral flange 32 into the outer peripheral end of the inner ring 11.
  • the shape of the circumferential cross section of the slinger 15 is not limited to the S-shape, and the shape may be appropriately changed as long as the step portion 29 corresponding to the formation position of the annular protrusion 24 formed on the seal member 14 is provided. can. Further, the material of the slinger 15 is not limited to metal, and other materials such as resin can be adopted as long as a predetermined strength can be secured.
  • a radial labyrinth 33 extending in the radial direction is formed between the base 23 of the seal member 14 and the flat portion 28 of the slinger 15, and an axial direction is formed between the annular protrusion 24 of the seal member 14 and the step portion 29 of the slinger 15.
  • Axial labyrinth 34 extending to is formed.
  • an opening labyrinth 35 extending in the axial direction is formed between the inner peripheral end of the outer ring 12 and the outer peripheral flange 31 of the slinger 15.
  • the continuously formed opening labyrinth 35, radial labyrinth 33, and axial labyrinth 34 form a labyrinth having a complicated shape, so that foreign matter can be effectively prevented from entering from the outside of the bearing. can do.
  • the axial width n of the radial labyrinth 33 shown in FIG. 2 is 0.5 mm, and the radial width t of the axial labyrinth 34 is 0.2 mm.
  • the axial width n of the radial labyrinth 33 can be appropriately changed within the range of 0.2 to 1.0 mm, preferably within the range of 0.3 to 0.7 mm. If the axial width n is smaller than 0.2 mm, when the inner ring 11 and the outer ring 12 rattle relatively in the axial direction, the seal member 14 and the slinger 15 may come into contact with each other to increase the bearing torque. Further, if the axial width n is larger than 1.0 mm, the effect of labyrinth to prevent the invasion of foreign matter may be reduced.
  • the radial width t of the axial labyrinth 34 can be appropriately changed within the range of 0.1 to 0.5 mm, preferably within the range of 0.1 to 0.3 mm. If the radial width t is smaller than 0.1 mm, when the inner ring 11 and the outer ring 12 rattle relatively in the radial direction, the seal member 14 and the slinger 15 may come into contact with each other to increase the bearing torque. Further, if the radial width t is larger than 0.5 mm, the effect of labyrinth to prevent the invasion of foreign matter may be reduced.
  • the radial labyrinth 33 is not limited to a shape that extends straight in the radial direction, but also includes a shape that is inclined by a predetermined angle in the axial direction.
  • the axial labyrinth 34 is not limited to a shape extending straight in the axial direction, but also includes a shape inclined by a predetermined angle in the radial direction.
  • the radial labyrinth 33 and the axial labyrinth 34 also include a shape curved with respect to the extending direction.
  • the axial height h from one surface of the base 23 of the sealing member 14 to the axial end of the press-fit end 26 is the axial height from the other surface of the base 23 to the axial end of the annular projection 24. It is preferably H or more.
  • the size of the gap m between the axial tip of the annular protrusion 24 of the seal member 14 and the protrusion 30 of the slinger 15 is 0.6 mm.
  • the size of this gap m may be the same as the axial width n of the radial labyrinth 33, but it may be 0.1 mm larger than the axial width n in consideration of the tolerance of the axial height H of the annular projection 24. There is.
  • FIG. 3 shows an example of a pulley provided with the ball bearing 10 shown in FIG.
  • This pulley includes a ball bearing 10 described above, a pulley boss portion 17 integrated with the inner ring 11, a pulley main body portion 41 integrated with the outer ring 12, and a cover 42 attached to the pulley boss portion 17. Be prepared.
  • the pulley boss portion 17 has an outer peripheral fitting surface 43 that fits into the inner ring 11 and a first shoulder portion 44 that abuts the inner ring 11 in the axial direction.
  • the pulley boss portion 17 is attached to a pulley support shaft (not shown).
  • the pulley main body 41 has an outer peripheral surface 45 around which a belt (not shown) is wound, an inner peripheral fitting surface 46 that fits on the outer ring 12, and a second shoulder portion 47 that abuts the outer ring 12 in the axial direction. ..
  • the outer peripheral surface 45 of the pulley main body 41 is along the axial direction, and a flat belt can be hung.
  • the pulley body 41 for a flat belt is exemplified, the outer peripheral surface 45 may be formed into a V-groove shape to correspond to the V-belt.
  • the ball bearing 10 rotatably supports the pulley main body 41.
  • the cover 42 is fitted to the outer periphery of the pulley boss portion 17 and is abutted in the axial direction of the inner ring 11.
  • the cover 42 can prevent foreign matter from entering the inside of the ball bearing 10.
  • FIG. 4 shows another example of the pulley provided with the ball bearing 10 shown in FIG. Compared with the pulley shown in FIG. 3, this pulley has the same shape of the pulley boss portion 17 and the cover 42, but the shape of the pulley main body portion 48 is different.
  • the pulley main body 48 has a substantially cylindrical shape, and the outer peripheral surface 49 around which the belt (not shown) is wound, the inner peripheral fitting surface 50 fitted to the outer ring 12, and the outer ring 12 in the axial direction. It has a second shoulder portion 51 that abuts against.
  • the outer peripheral surface 49 of the pulley main body 48 is along the axial direction, and a flat belt can be hung.
  • the outer peripheral surface 49 can be formed into a V-groove shape to correspond to the V-belt.
  • the ball bearing 10 rotatably supports the pulley main body 48.

Landscapes

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

Abstract

La présente invention comprend un chemin de roulement intérieur (11), un chemin de roulement extérieur (12), une bille (13), un élément d'étanchéité (14) et une bague d'étanchéité (15). L'élément d'étanchéité (14) présente une partie de base annulaire (23) et une saillie annulaire (24) s'étendant dans la direction axiale de la partie de base (23) vers la bague d'étanchéité (15) ; la bague d'étanchéité (15) présente une partie plate annulaire (28) conforme à la partie de base (23), et une surépaisseur (29) qui se courbe dans la direction axiale en fonction de la position de formation de la saillie annulaire (24) de manière à maintenir un état sans contact avec la saillie annulaire (24) ; un labyrinthe radial (33) s'étendant dans la direction radiale est formé entre la partie de base (23) et la partie plate (28) ; un labyrinthe axial (34) s'étendant dans la direction axiale est formé entre la saillie annulaire (24) et la surépaisseur (29).
PCT/JP2021/034118 2020-09-28 2021-09-16 Roulement à billes et poulie WO2022065194A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020162007A JP2022054795A (ja) 2020-09-28 2020-09-28 玉軸受及びプーリ
JP2020-162007 2020-09-28

Publications (1)

Publication Number Publication Date
WO2022065194A1 true WO2022065194A1 (fr) 2022-03-31

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PCT/JP2021/034118 WO2022065194A1 (fr) 2020-09-28 2021-09-16 Roulement à billes et poulie

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JP (1) JP2022054795A (fr)
WO (1) WO2022065194A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03127098U (fr) * 1990-01-30 1991-12-20
JP2008064238A (ja) * 2006-09-08 2008-03-21 Nsk Ltd 水ポンプ用軸受
JP2014109330A (ja) * 2012-12-03 2014-06-12 Ntn Corp 車輪用軸受の密封装置
JP2017180552A (ja) * 2016-03-29 2017-10-05 内山工業株式会社 軸受密封装置
JP2020051597A (ja) * 2018-09-28 2020-04-02 Ntn株式会社 車輪用軸受装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03127098U (fr) * 1990-01-30 1991-12-20
JP2008064238A (ja) * 2006-09-08 2008-03-21 Nsk Ltd 水ポンプ用軸受
JP2014109330A (ja) * 2012-12-03 2014-06-12 Ntn Corp 車輪用軸受の密封装置
JP2017180552A (ja) * 2016-03-29 2017-10-05 内山工業株式会社 軸受密封装置
JP2020051597A (ja) * 2018-09-28 2020-04-02 Ntn株式会社 車輪用軸受装置

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