WO2023248750A1 - Roulement à billes - Google Patents

Roulement à billes Download PDF

Info

Publication number
WO2023248750A1
WO2023248750A1 PCT/JP2023/020363 JP2023020363W WO2023248750A1 WO 2023248750 A1 WO2023248750 A1 WO 2023248750A1 JP 2023020363 W JP2023020363 W JP 2023020363W WO 2023248750 A1 WO2023248750 A1 WO 2023248750A1
Authority
WO
WIPO (PCT)
Prior art keywords
pocket
ball bearing
cage
conical surface
spherical concave
Prior art date
Application number
PCT/JP2023/020363
Other languages
English (en)
Japanese (ja)
Inventor
孝康 田窪
和憲 村主
昭彦 片山
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 WO2023248750A1 publication Critical patent/WO2023248750A1/fr

Links

Images

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
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/41—Ball cages comb-shaped
    • 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
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings

Definitions

  • the present invention relates to a ball bearing that can prevent heat generation and damage caused by interference between a cage and balls that occur during high-speed rotation, and can be applied to all kinds of high-speed rotation applications, including automobile parts and industrial machinery.
  • a ball bearing includes an inner raceway member 1 having an inner raceway groove 1a formed on its outer periphery, an outer raceway member 2 having an outer raceway groove 2a formed on its inner periphery, and an inner raceway member 2 having an outer raceway groove 2a formed on its inner periphery. It includes a plurality of balls 3 as rolling elements interposed between the groove 1a and the outer raceway groove 2a, and a retainer 4 having pockets 5 that hold the balls 3 at equal intervals in the circumferential direction.
  • a crown-shaped retainer 4 as shown in FIG. 22 may be used (Patent Document 1).
  • the crown-shaped retainer 4 has an annular portion 4a located on one side of the ball 3 in the axial direction, and a plurality of pairs of holding claws 4b extending from the annular portion 4a to the other side in the axial direction.
  • the pocket 5 to accommodate is formed by the opposing surfaces of the circumferentially adjacent holding claws 4b and one axial end surface of the annular portion 4a.
  • the shape of the pocket 5 is a spherical concave surface that holds the balls 3 in order to prevent the retainer 4 from coming off in the axial direction.
  • FIG. 23(a) shows a state before the holding claw 5a is deformed by centrifugal force
  • FIG. 23(b) schematically shows a state in which the holding claw 4b is deformed by centrifugal force.
  • Patent Document 2 discloses a ball bearing in which the balls 3 do not come into contact with the cylindrical surface 5b on the inner diameter side of the pocket 5 that accommodates the balls 3 even if the cage 4 is deformed by centrifugal force.
  • this invention makes it possible to avoid strong contact between the inner diameter side of the pocket and the balls even if the crown-shaped cage is deformed by centrifugal force when the ball bearing rotates at high speed.
  • the present invention aims to provide a ball bearing that has less whirl and does not interfere with rotation.
  • a ball bearing according to the present invention includes an inner raceway member having an inner raceway groove formed on its outer periphery, an outer raceway member having an outer raceway groove formed on its inner periphery, and an inner raceway member having an outer raceway groove formed on its inner periphery.
  • the cage includes a plurality of balls as rolling elements interposed between the groove and the outer raceway groove, and a cage having pockets that hold the balls at equal intervals in the circumferential direction.
  • the inner circumferential surface of the pocket is a composite surface consisting of a spherical concave surface that holds the balls and a conical surface, and the spherical concave surface is located on the outer diameter side. , the conical surface is located on the inner diameter side.
  • the axial center of the cone forming the conical surface is inclined with respect to the axial center of the retainer, and the inner peripheral surface of the pocket has a spherical concave surface on the bottom side.
  • a groove extending from the inner diameter side to the outer diameter side of the pocket is provided in the spherical concave surface of the inner peripheral surface of the pocket, and a conical surface is formed on the inner diameter side of the tip than this groove, and the conical surface is formed on the inner diameter side of the tip than the groove. It may also have a spherical concave portion.
  • the apex of the cone forming the conical surface is located in the inner diameter direction of the cage, and when the distance from the center of the ball to the apex of the cone forming the conical surface is L and the diameter of the ball is D, 5/6 The relationship ⁇ D ⁇ (1/ ⁇ 2) ⁇ L is satisfied.
  • the shoulder portion of the inner raceway member or the shoulder portion of the outer raceway member may be finished by grinding.
  • the cage used in the ball bearing according to the present invention securely holds the balls by the spherical concave portion located on the outer diameter side of the inner peripheral surface of the pocket, so that the cage does not come out in the axial direction. can be prevented. Furthermore, due to the conical surface located on the inner diameter side of the inner peripheral surface of the pocket, even if the crown part of the cage is deformed to the outer diameter due to centrifugal force during high-speed rotation, the cage does not swing around as much and strong contact with the balls is maintained. can be avoided.
  • FIG. 1 is a longitudinal cross-sectional view of a ball bearing according to the present invention.
  • 2 is a partially enlarged view showing a first embodiment of a cage used in the ball bearing of FIG. 1.
  • FIG. FIG. 3 is a perspective view of the retainer of FIG. 2;
  • FIG. 3 is a front view of the cage of FIG. 2;
  • FIG. 3 is a right side view of the retainer in FIG. 2;
  • 6 is a cross-sectional view taken along line AA in FIG. 5.
  • FIG. FIG. 3 is an explanatory diagram showing the relationship between the spherical concave surface and the conical surface of the cage according to the present invention.
  • FIG. 2 is a partially enlarged view showing a second embodiment of a cage used in a ball bearing according to the present invention.
  • FIG. 9 is a perspective view of the retainer of FIG. 8;
  • FIG. 9 is a front view of the retainer of FIG. 8;
  • FIG. 9 is a right side view of the retainer of FIG. 8;
  • 12 is a sectional view taken along line BB in FIG. 11.
  • FIG. 14 is a perspective view of the retainer of FIG. 13;
  • 14 is a front view of the retainer of FIG. 13.
  • FIG. FIG. 14 is a right side view of the retainer of FIG. 13;
  • 17 is a sectional view taken along line CC in FIG. 16.
  • FIG. 3 is a partial cross-sectional view showing a connecting portion between a spherical concave surface and a conical surface of the cage according to the present invention.
  • FIG. 2 is a longitudinal cross-sectional view of a ball bearing in which a cage according to the present invention is guided by an inner raceway member.
  • FIG. 2 is a longitudinal cross-sectional view of a ball bearing in which a cage according to the present invention is guided by an outer raceway member.
  • FIG. 2 is a longitudinal cross-sectional view of a conventional ball bearing. 22 is a perspective view of a cage used in the ball bearing of FIG. 21.
  • FIG. 6 is a schematic diagram showing a state of contact between a retaining claw and a ball when a crown-shaped retainer is deformed by centrifugal force, with (a) showing the state before the deformation and (b) showing the state after the deformation.
  • FIG. 3 is a perspective view of a cage used in another conventional ball bearing.
  • FIG. 1 shows a ball bearing 20 according to an embodiment of the present invention. Used in alternators, idler pulleys, electromagnetic clutches for car air conditioners, electric fan motors, etc.
  • the ball bearing 20 according to the embodiment shown in FIG. 1 includes an inner raceway member 21 having an inner raceway groove 21a formed on the outer circumferential surface, and an outer raceway groove 22a disposed on the outside of the inner raceway member 21, and an outer raceway groove 22a on the inner circumferential surface.
  • the main part is constituted by a sealing member 26 that seals an annular space 25 formed between the inner raceway member 21 and the outer raceway member 22.
  • the outer raceway member 22 is attached to a stationary member such as a housing, and the inner raceway member 21 is attached to an electric motor or a rotating shaft rotationally driven by engine output.
  • the seal member 26 is composed of an annular core metal 26a and a rubber-like member 26b that is integrally fixed to the core metal 26a. Fixed in mated state.
  • a seal groove 28 consisting of a circumferential groove is formed at a position corresponding to the inner circumference of the seal member 26, and a seal lip 26c formed at the inner circumference side end of the seal member 26 is formed at a position corresponding to the inner circumference of the seal member 26. It is in sliding contact with the seal groove 28 of 21.
  • this embodiment illustrates a type in which the inner raceway member 21 rotates
  • a type in which the inner raceway member 21 is attached to a stationary member such as a shaft and the outer raceway member 22 is attached to a rotating shaft and rotates may also be used. is also applicable.
  • the inner raceway member 21 rotates while the seal lip 26c at the tip of the seal member 26 remains in sliding contact with or close to the outer peripheral end of the inner raceway member 21. This prevents foreign matter such as water and dust from entering the bearing, or lubricant from leaking from the inside of the bearing to the outside.
  • the cage 24 has pockets 31 that hold a plurality of balls 23 at equal intervals in the circumferential direction, and an annular portion 30 located on one side of the balls 23 in the axial direction. , a plurality of pairs of holding claws 32 extending from the annular portion 30 to the other side in the axial direction, and the pocket 31 is formed by the opposing surfaces of the circumferentially adjacent holding claws 32 and one end surface in the axial direction of the annular portion 30. is forming.
  • the inner peripheral surface of the pocket 31 is formed into a composite surface consisting of a spherical concave surface 31a that holds the ball 23 and a conical surface 31b.
  • the inner peripheral surface of the pocket 31 is basically a spherical concave surface 31a that holds the balls 23.
  • the rolling element guide is such that the container 24 does not come into contact with the shoulders of the inner raceway member 21 and the outer raceway member 22.
  • the inner peripheral surface of the pocket 31 is A part of the inner diameter side is a conical surface 31b.
  • the axis of the conical surface 31b is inclined with respect to the axis of the cage 24. This angle of inclination is such that the conical surface 31b is located at the tip of the pocket 31 and the spherical concave surface 31a remains at the bottom of the pocket 31, and the size of the angle is 45 degrees at maximum.
  • the projected length as seen from the direction of the rotation axis is 5/6 ⁇ D ⁇ (1/ ⁇ 2).
  • the conical surface 31b of the cage 24 in the embodiment shown in FIGS. It is tilted against. Therefore, the spherical concave surface 31a remains on the bottom side of the inner peripheral surface of the pocket 31, and the conical surface 31b is located from the inner diameter side of the pocket 31 to the tip end side of the holding claw 32.
  • FIGS. 2 to 6 to make it easier to understand the spherical concave surface 31a and the conical surface 31b, the spherical shape forming the spherical concave surface 31a is shown with a broken line, and the cone forming the conical surface 31b is shown with a dashed line. .
  • FIGS. 8 to 12 show a cage 24 of a second embodiment used in the ball bearing 20 of the present invention.
  • the retainer 24 of the second embodiment has a groove 33 in the spherical concave surface 31a of the inner peripheral surface of the pocket 31.
  • the inner diameter side of the tip from the groove 33 is a conical surface 31b
  • the spherical concave surface 31a is located on the outer diameter side of the tip from the groove 33
  • the spherical concave surface 31a is also left on the bottom side of the pocket 31 from the groove 33.
  • the grooves 33 act as oil reservoirs, so the lubricity during rotation of the bearing is improved.
  • FIGS. 13 to 17 show a cage 24 of a third embodiment used in the ball bearing 20 of the present invention.
  • the entire inner peripheral surface of the pocket 31 is a conical surface 31b, and the remaining outer peripheral surface is a spherical concave surface 31a.
  • the spherical concave surface 31a and the conical surface 31b are continuous surfaces connected by a tangential line, so that the balls 23 and the pockets 31 are Since there is surface contact, there is no concern that the oil film will run out, and a good lubrication state can be maintained.
  • a resin with excellent wear resistance and seizure resistance can be used, and in particular, a resin with excellent tensile elongation, tensile strength, impact resistance, abrasion resistance, lubricity, etc.
  • Polyamide resins such as PA66 (polyamide 66), PA46 (polyamide 46), PA9T (polyamide 9T), PA11 (polyamide 11) or PA6 (polyamide 6) are desirable.
  • fibrous reinforcing materials such as carbon, glass, and aramid may be combined to improve strength and creep characteristics.
  • the inner raceway member 21, the outer raceway member 22, and the balls 23 are formed of metal such as bearing steel or carburized steel.
  • the grease filled in this ball bearing 20 is a semi-solid lubricant consisting of base oil, thickener, and additives.
  • the base oil constituting the lubricating grease include mineral oils such as paraffinic mineral oil and naphthenic mineral oil, hydrocarbon synthetic oils such as polybutene, poly- ⁇ -olefin, alkylbenzene, alkylnaphthalene, and alicyclic compounds; Natural oils and fats, polyol ester oils, phosphate esters, diester oils, polyglycol oils, silicone oils, polyphenyl ether oils, alkyldiphenyl ether oils, non-hydrocarbon synthetic oils such as fluorinated oils, etc. are generally used as base oils for lubricating greases. Any conventional oil can be used without particular limitation.
  • thickeners examples include metal soap thickeners such as aluminum soap, lithium soap, sodium soap, composite lithium soap, composite calcium soap, and composite aluminum soap, and urea compounds such as diurea compounds and polyurea compounds. These thickeners may be used alone or in combination of two or more.
  • additives for lubricating greases include extreme pressure agents, amine-based and phenolic antioxidants, metal deactivators such as benzotriazole, viscosity index improvers such as polymethacrylate and polystyrene, and molybdenum disulfide. , solid lubricants such as graphite, etc. These can be added alone or in combination of two or more.
  • the cage 24 used in the ball bearing 20 according to the present invention reliably holds the balls 23 by the spherical concave surface 31a of the inner peripheral surface of the pocket 31, so that the cage 24 does not come out in the axial direction. can be prevented. Even if the crown portion of the retainer 24 is deformed to the outer diameter due to centrifugal force during high-speed rotation, the retainer 24 does not swing around much, and the conical surface 31b of the inner peripheral surface of the pocket 31 prevents strong contact with the balls 23. It can be prevented. Furthermore, when the retainer 24 is assembled into a bearing, the pocket 31 expands to embrace the balls 23, and the crown portion is deformed to the outer diameter by the conical surface 31b. It is possible to reduce deformation by reducing the pull-out force from the mold during injection molding. Therefore, it is possible to use hard resin as the material for the cage 24.
  • the guiding type is a rolling element guide.
  • the shoulder of the inner raceway member 21 is ground to function as a guide surface for the retainer 24, and as shown in FIG. 20, the retainer 24 is structured to come into contact with the shoulder of the outer raceway member 22.
  • the shoulder portion of the outer raceway member 22 may be ground to function as a guide surface for the retainer 24.
  • Ball bearing 21 Inner raceway member 21a Inner raceway groove 22 Outer raceway member 22a Outer raceway groove 23 Balls 24 Cage 30 Annular portion 31 Pocket 31a Spherical concave surface 31b Conical surface 32 Holding claw 33 Groove

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

L'invention concerne un roulement à billes dans lequel, même lorsqu'une griffe de retenue d'un dispositif de retenue de type couronne est déformée par une force centrifuge, un contact fort entre un côté radial interne d'une poche et une bille peut être évité et un tourbillonnement centrifuge du dispositif de retenue est petit et interfère avec la rotation. Un dispositif de retenue 24 a une partie annulaire 30 située sur un côté dans une direction axiale d'une bille 23 et une pluralité de paires de griffes de retenue 32 s'étendant à partir de la partie annulaire 30 vers l'autre côté dans la direction axiale. Une poche 31 pour stocker la bille 23 est formée par des surfaces opposées des griffes de dispositif de retenue 32 adjacentes l'une à l'autre dans une direction circonférentielle et une surface d'extrémité de la partie annulaire 30 dans la direction axiale. Une surface circonférentielle interne de la poche 31 est une surface composite composée d'une surface concave sphérique 31a qui maintient la bille 23, et d'une surface conique 31b. La surface concave sphérique 31a est située sur le côté radial externe et la surface conique 31b est située sur le côté radial interne.
PCT/JP2023/020363 2022-06-20 2023-05-31 Roulement à billes WO2023248750A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022098692A JP2024000120A (ja) 2022-06-20 2022-06-20 玉軸受
JP2022-098692 2022-06-20

Publications (1)

Publication Number Publication Date
WO2023248750A1 true WO2023248750A1 (fr) 2023-12-28

Family

ID=89379869

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/020363 WO2023248750A1 (fr) 2022-06-20 2023-05-31 Roulement à billes

Country Status (2)

Country Link
JP (1) JP2024000120A (fr)
WO (1) WO2023248750A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001124094A (ja) * 1999-10-27 2001-05-08 Minebea Co Ltd 軸受の外輪のランド仕上げ加工法及び軸受
JP2002503326A (ja) * 1998-02-24 2002-01-29 エスケイエフ フランス 剛性玉軸受のための保持器及び関連せる軸受
JP2004003532A (ja) * 2002-04-05 2004-01-08 Minebea Co Ltd 保持器
JP2007292093A (ja) * 2006-04-21 2007-11-08 Ntn Corp 深溝玉軸受
JP2012057754A (ja) * 2010-09-10 2012-03-22 Ntn Corp 転がり軸受用保持器およびこれを備えた転がり軸受

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002503326A (ja) * 1998-02-24 2002-01-29 エスケイエフ フランス 剛性玉軸受のための保持器及び関連せる軸受
JP2001124094A (ja) * 1999-10-27 2001-05-08 Minebea Co Ltd 軸受の外輪のランド仕上げ加工法及び軸受
JP2004003532A (ja) * 2002-04-05 2004-01-08 Minebea Co Ltd 保持器
JP2007292093A (ja) * 2006-04-21 2007-11-08 Ntn Corp 深溝玉軸受
JP2012057754A (ja) * 2010-09-10 2012-03-22 Ntn Corp 転がり軸受用保持器およびこれを備えた転がり軸受

Also Published As

Publication number Publication date
JP2024000120A (ja) 2024-01-05

Similar Documents

Publication Publication Date Title
WO2012157411A1 (fr) Dispositif de retenue destiné à un palier à billes et palier à billes
JP5615649B2 (ja) 玉軸受
US8961023B2 (en) Ball bearing retainer and ball bearing
JP2002106686A (ja) プーリユニット
JP2012163172A (ja) 玉軸受用保持器および玉軸受
JP2012107674A (ja) 玉軸受
JP5872172B2 (ja) 玉軸受用保持器および玉軸受
WO2023248750A1 (fr) Roulement à billes
JP5863284B2 (ja) 玉軸受用保持器および玉軸受
WO2024018952A1 (fr) Roulement à billes
WO2023008313A1 (fr) Roulement à billes
WO2023189430A1 (fr) Roulement à billes
WO2023189431A1 (fr) Roulement à billes
WO2023149266A1 (fr) Roulement à billes
JP2013142407A (ja) 玉軸受用保持器および玉軸受
JP5836649B2 (ja) 玉軸受用保持器および玉軸受
JP2013200006A (ja) 玉軸受およびその保持器
WO2023153386A1 (fr) Roulement à billes rempli de graisse
JP6096260B2 (ja) 玉軸受用保持器および玉軸受
WO2023048046A1 (fr) Roulement à rouleaux
JP2012172834A (ja) 密封型転がり軸受
WO2017038754A1 (fr) Roulement à billes à contact oblique

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23826937

Country of ref document: EP

Kind code of ref document: A1