WO2017047773A1 - Roulement à billes à contact angulaire - Google Patents

Roulement à billes à contact angulaire Download PDF

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Publication number
WO2017047773A1
WO2017047773A1 PCT/JP2016/077501 JP2016077501W WO2017047773A1 WO 2017047773 A1 WO2017047773 A1 WO 2017047773A1 JP 2016077501 W JP2016077501 W JP 2016077501W WO 2017047773 A1 WO2017047773 A1 WO 2017047773A1
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WO
WIPO (PCT)
Prior art keywords
ball bearing
bearing
seal member
seal
flocked portion
Prior art date
Application number
PCT/JP2016/077501
Other languages
English (en)
Japanese (ja)
Inventor
裕士 恩田
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 WO2017047773A1 publication Critical patent/WO2017047773A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
    • F16C33/7843—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc
    • F16C33/7846—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc with a gap between the annular disc and the inner race
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
    • F16C33/7823—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of sealing lips
    • 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
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
    • F16C19/163—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls with angular contact

Definitions

  • the present invention relates to an angular ball bearing used for supporting a spindle of a machine tool.
  • angular ball bearings can receive a combined load composed of a radial load and a relatively large axial load. For this reason, it is often used for applications such as machine tools, medical equipment, construction machines, and agricultural machines that require high-speed rotation even under environments with heavy loads and various load directions.
  • Angular contact ball bearings that support machine tool spindles are required to rotate stably and at high speeds in order to increase machining efficiency.
  • Oil mist lubrication, air-oil lubrication, and bearings that supply lubricating oil from the outside are required for lubrication.
  • Grease lubrication that encloses grease inside is used.
  • coolant is supplied to the workpiece and the cutting tool in order to lubricate and cool the workpiece and the cutting tool during cutting.
  • coolant liquid or foreign matter enters the angular ball bearing that supports the spindle of the machine tool, it may affect bearing lubrication and cause bearing seizure.
  • the seal structure at the front end of the main shaft has been devised, but it may still enter the bearing and cause problems.
  • Patent Document 1 proposes a roller bearing with a seal that prevents heat generation due to contact between an inner ring seal groove and a seal lip.
  • this rolling bearing 11 includes an inner ring 12, an outer ring 13, a ball 14, and a cage 15, and a pair of seals 16, 16 that seal the end of the bearing space between the inner and outer rings are provided as an outer ring.
  • the seal lip 16a of the seal 16 is positioned in the annular inner ring seal groove 12a provided on the outer diameter surface of the inner ring 12, and the inner ring end face of the inner ring seal groove 12a is fitted.
  • the distance between the inner side surface on the side and the side surface of the seal lip 16a is a distance at which the seal lip 16a and the inner ring seal groove 12a are held in a non-contact manner.
  • spindle configuration that provides ancillary equipment and performs air purge to ensure sealing.
  • air is blown out to prevent the coolant liquid and foreign matter from entering.
  • the pressure inside the spindle is made higher than the outside so as to prevent the intrusion of the coolant or foreign matter, so that the seal can be made more reliable.
  • the present invention has been made to cope with such problems, and provides an angular contact ball bearing having a seal structure capable of preventing entry of coolant liquid and foreign matters from the outside while being a simple structure provided inside the bearing.
  • the purpose is to do.
  • the angular ball bearing of the present invention is an angular ball bearing comprising an inner ring and an outer ring which are raceways, a plurality of balls interposed between the inner and outer rings, a cage for holding the balls, and a seal member.
  • the seal member has one end fixed to the outer ring, has a gap with the inner ring, and implants fibers in at least one part selected from the inner diameter part of the seal member and the bearing outer end surface. It has the hair transplant part formed.
  • the above-described flocked portion is composed of a plurality of types of fibers having different fiber lengths. Moreover, the said hair transplant part is comprised from the fiber of the same fiber length as the said clearance gap, and the fiber of fiber length shorter than the said clearance gap, It is characterized by the above-mentioned.
  • the flocked portion is formed on the inner diameter portion of the seal member and the bearing outer end surface, and the flocked portion on the inner diameter portion and the flocked portion on the end surface are discontinuous.
  • the fiber is a synthetic resin fiber
  • the flocked portion is an electrostatic flocked portion.
  • the angular ball bearing of the present invention comprises an inner ring and an outer ring which are raceways, a plurality of balls interposed between the inner and outer rings, a cage for holding the balls, and a seal member.
  • a flocked product in which one end is fixed to the outer ring, a gap is formed between the inner ring, and fibers are implanted in at least one portion selected from the inner diameter portion (seal lip) of the seal member and the outer end surface of the bearing. Therefore, when used in a machine tool or the like, it is possible to prevent or suppress the entry of coolant liquid or foreign matter from the outside of the bearing with a simple structure without requiring any additional equipment.
  • the flocked portion is composed of a plurality of types of fibers having different fiber lengths, for example, a fiber having the same fiber length as the gap and a fiber having a fiber length shorter than the gap. Intrusion of coolant and foreign matter can be further prevented while suppressing an increase in torque due to contact.
  • a flocked portion on both the inner diameter portion of the seal member and the outer end surface of the bearing, coolant liquid and foreign matter can be adsorbed on the seal end surface, and entry into the bearing can be suppressed. Further, discontinuity of the flocked portion of the inner diameter portion and the flocked portion of the outer end surface of the bearing can suppress the intrusion of the coolant liquid through the seal end surface, the inner diameter of the seal, and the path inside the bearing.
  • the fiber is a synthetic resin fiber and the flocked portion is an electrostatic flocked portion, swelling and dissolution due to oil are difficult to occur, and it is chemically stable and becomes a homogeneous and dense flocked portion.
  • FIG. 1 is a partial cross-sectional view of an angular ball bearing having a flocked portion (seal inner diameter portion) as an angular ball bearing of the present invention.
  • the black arrows in the figure indicate the intrusion direction of the coolant and foreign matter from the outside of the bearing (the same applies to FIGS. 2 to 4).
  • a plurality of balls 4 are arranged in a circumferential direction in a raceway space between an inner ring 2 and an outer ring 3, and the inner ring 2, the outer ring 3, and the balls 4 have a predetermined contact angle. It is provided with ⁇ .
  • a cage 5 On the outer diameter surface of the inner ring 2, a counter bore 2 b is provided on one side (left side in the drawing) of the raceway surface 2 a so that the outer diameter gradually decreases toward the outside. An annular seal groove 2c is provided on the shoulder on the opposite side of the raceway surface 2a.
  • the angular ball bearing 1 is lubricated with grease sealed inside the bearing.
  • the cage 5 is an outer ring guide system, and is guided to the outer ring 3 when the outer diameter surface of the cage 5 comes into contact with the inner diameter surface of the outer ring 3.
  • the outer ring 3 is provided with a pair of annular seal members 7 and 7 at both axial ends of the outer ring 3 in order to seal the bearing space between the inner and outer rings.
  • the seal member 7 is a composite composed of a cored bar 7a and an elastic member 7b such as a rubber molded body. One end of each of the seal members 7 is fixed to the outer ring 3, and a gap (clearance) is provided between the seal members 7 and the inner ring 2.
  • one seal member 7 (the left side in the figure) is disposed at the position of the counter bore 2b on the outer diameter surface of the inner ring 2 so that the inner diameter portion 7c thereof is not in contact with the inner ring 2.
  • the other seal member 7 (right side in the figure) is disposed in the seal groove 2 c of the inner ring 2 so that the inner diameter portion 7 c thereof is not in contact with the inner ring 2.
  • a flocked portion 6 formed by flocking fibers is formed on the inner diameter portion 7 c of the seal member 7.
  • the fiber length of the short fiber which comprises the hair transplant part 6 is single, and the length is made into the same grade as the said clearance gap.
  • the fiber tip of the flocked portion 6 is in sliding contact with the counter bore 2b and the seal groove 2c of the inner ring 2, thereby sealing the gap between the seal member 7 and the inner ring 2.
  • FIG. 2 is a partial cross-sectional view of an angular contact ball bearing having a flocked portion (bearing outer end surface) as an angular contact ball bearing of the present invention.
  • the flocked portion 6 is formed on the bearing outer end surface 7 d of the seal member 7.
  • no flocked portion is formed on the inner diameter portion of the seal member 7.
  • the other overall configuration is the same as that of the angular ball bearing of the form shown in FIG.
  • the flocked portion 6 on the outer end face 7d of the bearing can adsorb the coolant and foreign matter before reaching the seal lip, entry into these bearings can be suppressed. Further, the bearing outer end surface 7d on which the flocked portion 6 is formed has less interference with other members than the inner diameter portion, and the inner ring rotary bearing is not subjected to centrifugal force, so that the flocked portion is less likely to drop off. The above effects can be expected stably over a long period of time.
  • FIG. 3 is a partial cross-sectional view of an angular ball bearing having a flocked portion (seal inner diameter portion) as the angular ball bearing of the present invention.
  • the flocked portion 6 is formed on the inner diameter portion 7 c of the seal member 7 as in FIG. 1.
  • a plurality of types of fibers having different fiber lengths are used as the short fibers that form the flocked portion 6.
  • the other overall configuration is the same as that of the angular ball bearing of the form shown in FIG.
  • the flocked portion 6 formed in the inner diameter portion 7c of the seal member 7 has the fiber tip in sliding contact with the counter bore and the seal groove of the inner ring 2 in order to seal the gap between the seal member 7 and the inner ring 2. Since this sliding contact increases torque and heat generation, it is necessary to suppress this. For example, by adjusting the fiber length so that it is about the same as the gap, the contact becomes light contact, and an increase in torque can be prevented.
  • the short fibers forming the flocked portion 6 the fibers having the same fiber length as the gap and the fibers having a fiber length shorter than the gap are used, so that the short fiber is shorter than the inner ring 2. Are not in contact with each other, and long fibers are light in contact with each other, and an increase in torque and heat generation can be suppressed. Moreover, it has sufficient sealing property by the flocking structure which combined these.
  • FIG. 4 is a partial cross-sectional view of an angular ball bearing having a flocked portion (a seal inner diameter portion and a bearing outer end surface) as an angular ball bearing of the present invention.
  • the flocked portion 6 is formed on the inner diameter portion 7c of the seal member 7 as in FIG. 1, and the flocked portion 6 is formed on the bearing outer end surface 7d of the seal member 7 as in FIG. Forming.
  • the other overall configuration is the same as that of the angular ball bearing of the form shown in FIG.
  • the combination of the flocked portions shown in FIGS. 1 and 2 can further prevent the coolant liquid and foreign matter from entering the bearing.
  • the seal member 7 when the flocked portion of the inner diameter portion 7 c and the flocked portion of the bearing outer end surface 7 d are continuously formed, the seal end surface, the inner diameter of the seal, and the inside of the bearing are transmitted through the flocked portion. There is a risk of coolant entering the path. For this reason, it is preferable that these flocked parts are not continuous.
  • the flocked portion 6 may be formed on a part of each of the inner diameter portion 7c and the bearing outer end surface 7d instead of the entire surface.
  • the structure of the seal member is not limited to the illustrated example, and may be a shield made of a plate-shaped metal plate, a rubber molded body alone, a composite of a rubber molded body and a plastic plate, or a ceramic plate.
  • the cage 5 is a resin-made machined cage, and pocket portions for holding balls as rolling elements are provided at regular intervals in the circumferential direction on an annular cage body.
  • the resin cage is made of, for example, a polyamide resin such as a phenol resin, a polyether ether ketone (PEEK) resin, a polyphenylene sulfide (PPS) resin, a thermoplastic polyimide resin, a polyamideimide resin, a nylon 66 resin, or a nylon 46 resin. It is manufactured by injection molding using a resin composition containing a reinforcing fiber such as carbon fiber or glass fiber and other additives as a material. In particular, a phenol resin is preferable because it has a high elastic modulus at a high temperature and can cope with high-speed rotation.
  • the angular ball bearing of the present invention is not limited to this, and any material such as a metal material can be adopted.
  • the cage type is not particularly limited, and may be a crown-shaped cage or a waveform cage.
  • the flocked portion 6 is formed by flocking short fibers.
  • Spraying or electrostatic flocking can be employed as a flocking method. Even on a curved surface such as the guide surface of the cage, it is preferable to employ electrostatic flocking because a large amount of fibers can be densely and vertically planted in a short time.
  • electrostatic flocking method a known method can be adopted.For example, after applying an adhesive to a range where electrostatic flocking is performed, the short fibers are charged and flocked substantially perpendicularly to the adhesive application surface by electrostatic force, The method of performing a drying process, a finishing process, etc. is mentioned. In addition, electrostatic spraying (fiber coating) can also be employed.
  • the short fiber used for flocking is not particularly limited as long as it can be used as a short fiber for flocking.
  • polyolefin resin such as polyethylene and polypropylene
  • polyamide resin such as nylon, aromatic polyamide resin
  • polyethylene terephthalate Polyester resin
  • polyethylene naphthalate polyethylene succinate
  • polybutylene terephthalate synthetic resin fiber
  • acrylic resin vinyl chloride
  • vinylon (2) inorganic fiber
  • inorganic fiber such as carbon fiber, glass fiber, (3) rayon, acetate, etc.
  • natural fibers such as cotton, silk, hemp and wool.
  • synthetic resin fiber among the above because it is difficult to cause swelling and dissolution with oil, is chemically stable, can produce a large amount of homogeneous fibers, and can be obtained at low cost.
  • the shape of the fiber is not particularly limited as long as it does not interfere with other members that adversely affect the bearing function at the place where the flocked portion is formed.
  • the specific shape is preferably, for example, a length of 0.5 to 2.0 mm and a thickness of 0.5 to 50 dtex, and the density of the fibers in the flocked portion is the ratio of the fibers to the flocked area Is preferably 1 to 40%.
  • the shape of the short fiber there are a straight and a bend (a shape where the tip is bent), and any of them can be used.
  • the adhesive examples include an adhesive mainly composed of urethane resin, epoxy resin, acrylic resin, vinyl acetate resin, polyimide resin, silicone resin and the like.
  • urethane resin solvent adhesive epoxy resin solvent adhesive, vinyl acetate resin solvent adhesive, acrylic resin emulsion adhesive, acrylic ester-vinyl acetate copolymer emulsion adhesive, vinyl acetate emulsion adhesive And urethane resin emulsion adhesives, epoxy resin emulsion adhesives, polyester emulsion adhesives, ethylene-vinyl acetate copolymer adhesives, and the like. These may be used independently and 2 or more types may be used together.
  • the angular ball bearing of the present invention is lubricated with a lubricant (mainly grease). These lubricants are sealed in the bearing space between the inner and outer rings, and lubricated by being interposed in the rolling surface. Any lubricating oil or grease can be used without particular limitation as long as it is normally used for an angular ball bearing.
  • the flocked portion is formed on the seal member as described above. Therefore, particularly when formed on the inner diameter portion, the seal member has a high sealing performance against foreign matters from the outside, and at the same time, high against leakage of grease inside the bearing. Also has sealing properties. Therefore, for example, even when a low-viscosity base oil or a grease having a high miscibility is used for torque reduction, leakage of the grease or base oil can be prevented. For this reason, various greases can be widely used.
  • the angular ball bearing of the present invention is a simple structure provided inside the bearing, but has a seal structure that can prevent entry of coolant liquid and foreign matters from the outside, and can be used for angular ball bearings in various applications.
  • it can be suitably used as an angular ball bearing that supports a spindle of a machine tool that is used at high speed and is likely to be mixed with coolant or foreign matter.

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

Abstract

L'invention concerne un roulement à billes à contact angulaire, lequel roulement a une structure simple pour l'installation à l'intérieur d'un palier, et lequel a une structure d'étanchéité apte à empêcher l'entrée de liquide de refroidissement et de matières étrangères à partir de l'extérieur. Le roulement à billes à contact angulaire (1) supporte un arbre principal de machine-outil, ou analogue, et comporte : une bague interne (2) et une bague externe (3), qui sont des bagues de roulement; une pluralité de billes (4) interposées entre les bagues interne et externe; un élément de retenue (5) pour retenir les billes (4); et un élément d'étanchéité (7). Une extrémité de l'élément d'étanchéité (7) est fixée à la bague externe (3), et un espace est présent entre l'élément d'étanchéité (7) et la bague interne (2). Au moins une partie sélectionnée parmi la section de diamètre interne (7c) et la surface d'extrémité externe de roulement (7d) de l'élément d'étanchéité (7) comprend une section de soies (6), dans laquelle des fibres sont implantées à titre de soies.
PCT/JP2016/077501 2015-09-18 2016-09-16 Roulement à billes à contact angulaire WO2017047773A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015185356A JP2017057989A (ja) 2015-09-18 2015-09-18 アンギュラ玉軸受
JP2015-185356 2015-09-18

Publications (1)

Publication Number Publication Date
WO2017047773A1 true WO2017047773A1 (fr) 2017-03-23

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PCT/JP2016/077501 WO2017047773A1 (fr) 2015-09-18 2016-09-16 Roulement à billes à contact angulaire

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WO (1) WO2017047773A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB526125A (en) * 1938-03-12 1940-09-11 Skf Svenska Kullagerfab Ab Improvements in or relating to bearing seals
JPS55132464A (en) * 1979-03-30 1980-10-15 Skf Ab Sealing device
JP2008069828A (ja) * 2006-09-13 2008-03-27 Nsk Ltd 転がり軸受
JP2010159876A (ja) * 2009-01-06 2010-07-22 General Electric Co <Ge> コンプライアント回転シールを提供するシステム及び方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB526125A (en) * 1938-03-12 1940-09-11 Skf Svenska Kullagerfab Ab Improvements in or relating to bearing seals
JPS55132464A (en) * 1979-03-30 1980-10-15 Skf Ab Sealing device
JP2008069828A (ja) * 2006-09-13 2008-03-27 Nsk Ltd 転がり軸受
JP2010159876A (ja) * 2009-01-06 2010-07-22 General Electric Co <Ge> コンプライアント回転シールを提供するシステム及び方法

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