WO2017022794A1 - Dispositif de retenue de palier à rouleaux et palier à rouleaux - Google Patents

Dispositif de retenue de palier à rouleaux et palier à rouleaux Download PDF

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Publication number
WO2017022794A1
WO2017022794A1 PCT/JP2016/072798 JP2016072798W WO2017022794A1 WO 2017022794 A1 WO2017022794 A1 WO 2017022794A1 JP 2016072798 W JP2016072798 W JP 2016072798W WO 2017022794 A1 WO2017022794 A1 WO 2017022794A1
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Prior art keywords
fluororesin
ppm
rolling bearing
layer
base material
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PCT/JP2016/072798
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English (en)
Japanese (ja)
Inventor
晶美 多田
佐藤　洋司
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Ntn株式会社
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Priority claimed from JP2015153734A external-priority patent/JP2017032093A/ja
Priority claimed from JP2015153733A external-priority patent/JP2017032092A/ja
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2017022794A1 publication Critical patent/WO2017022794A1/fr

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    • 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
    • F16C33/46—Cages for rollers or needles
    • F16C33/56—Selection of substances
    • 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
    • F16C33/66—Special parts or details in view of lubrication

Definitions

  • the present invention relates to a rolling bearing cage and a rolling bearing, and in particular, has excellent wear resistance and seizure resistance on the cage surface, and can maintain the excellent wear resistance and seizure resistance for a long period of time,
  • the present invention relates to a rolling bearing using the cage.
  • ⁇ Sliding surfaces such as rolling bearings and cages are supplied with lubricating oil or lubricating grease to reduce rolling friction or sliding friction. Further, a surface treatment for improving the slidability is applied to the sliding surface.
  • One of the surface treatments is a method of forming a fluorine resin film. For example, a method of improving wear resistance and adhesion to a substrate by irradiating a polytetrafluoroethylene (hereinafter referred to as PTFE) coating formed on a sliding portion of a sliding member with a dose of 50 to 250 kGy. Is known (Patent Document 1).
  • a fluororesin film is formed on the surface of a base material excellent in heat resistance selected from metal materials such as polyimide resin, copper, aluminum and alloys thereof, ceramics, and glass, and at a temperature equal to or higher than the melting point of the fluororesin.
  • a base material excellent in heat resistance selected from metal materials such as polyimide resin, copper, aluminum and alloys thereof, ceramics, and glass, and at a temperature equal to or higher than the melting point of the fluororesin.
  • the fluororesin As a sliding member made of fluororesin used for non-lubricated bearings, dynamic seals, etc., the fluororesin is heated above its crystalline melting point, and ionizing radiation is emitted within the range of irradiation dose of 1 kGy to 10 MGy in the absence of oxygen. Irradiated fluororesins are known (Patent Document 3).
  • Patent Document 1 is a method for improving adhesion to a base material because it is used under non-lubricated and low surface pressure conditions.
  • Lubricating oil required for sliding surfaces of various machines It is difficult to apply in the case of medium, high slip speed and high surface pressure.
  • the fluororesin coating described in Patent Document 2 is intended to simultaneously cause a cross-linking reaction of a fluororesin and a chemical reaction between the fluororesin and a substrate surface, thereby achieving strong adhesion between the two.
  • an iron substrate such as a cage or a cage, it is difficult to generate a chemical reaction with the surface of the substrate, and there is a problem that strong adhesion cannot be achieved.
  • the sliding member described in Patent Document 3 is used for a non-lubricated bearing, a dynamic seal, and the like, and relates to a sliding member made of a fluororesin rather than a film shape. Therefore, the characteristics as a coating material are unknown, and it is difficult to apply to rolling bearing applications that require high slip speed and high surface pressure in lubricating oil. Similar to the coating produced by the method described in Patent Literature 1, the coating described in Patent Literature 4 is evaluated with a flat plate test piece, a low surface pressure, a low sliding speed, and no lubrication. It is not known whether it can be used under pressure, high slip speed and oil lubrication.
  • the present invention has been made to cope with such a problem, and is a rolling bearing holding having a sliding surface excellent in slidability even under conditions of high sliding speed and high surface pressure in lubricating oil. It is an object of the present invention to provide a rolling bearing using the cage and the cage.
  • the rolling bearing cage of the present invention holds a rolling element of a rolling bearing used in an oil lubricated environment, and has a base material and a sliding layer formed on the surface of the base material.
  • This sliding layer is a fluororesin layer, and the fluororesin present on the surface of the sliding layer that is not in contact with the base material of the fluororesin layer and its neighboring layers has at least a three-dimensional structure. That the surface of the sliding layer and its neighboring layers have at least a three-dimensional structure is not limited to the fact that the entire portion of the sliding layer is made of only a three-dimensional fluoropolymer, and does not impair the characteristics of the three-dimensional structure.
  • the fluororesin having a two-dimensional structure may be included in this part.
  • the fact that the surface on the substrate side and the vicinity thereof have an uncrosslinked two-dimensional structure is not limited to the fact that this entire portion of the sliding layer is made of only a two-dimensional structure fluororesin, As long as the characteristics are not impaired, a part of the fluororesin having a three-dimensional structure may be included in this part.
  • the vicinity means a layer less than 2.5 ⁇ m from the target surface.
  • the surface of the sliding layer that is not in contact with the base material and the fluororesin existing in the neighboring layer have a three-dimensional structure, and the surface in contact with the base material and the vicinity thereof.
  • the fluororesin present in the layer has a two-dimensional structure.
  • the content of the three-dimensional structure of the fluororesin continuously decreases from the surface of the fluororesin layer toward the surface in contact with the base material.
  • the three-dimensional structure of the fluororesin present on the surface of the sliding layer that is not in contact with the base material and in the vicinity thereof is continuous toward the surface in contact with the base material. ing.
  • the fluororesin is a PTFE resin, and the thickness of the sliding layer is 5 ⁇ m or more and less than 40 ⁇ m.
  • the base material is an iron-based metal material.
  • the rolling bearing of the present invention is a rolling bearing using the cage of the present invention.
  • the fluororesin present on the surface of the sliding layer that is not in contact with the base material and its neighboring layers has at least a three-dimensional structure. Therefore, the lubricating oil has a high sliding speed and a high surface pressure. Wear can be suppressed even under conditions, and the life of the bearing can be maintained for a long time. Moreover, the rolling bearing using this cage is excellent in slidability in lubricating oil.
  • the rolling bearing cage of the present invention has a sliding layer formed on a substrate.
  • An example of a sectional view of the sliding layer is shown in FIG.
  • FIG. 1 shows an example in which the cross section is a gradient material.
  • the sliding layer 21 is composed of a cross-linked fluororesin layer formed on the surface of the metal substrate 22.
  • the cross-linked fluororesin layer has a cross-linked structure in which the fluororesin layer has a three-dimensional structure in which the surface 23 of the fluororesin layer that is not in contact with the metal substrate and the fluororesin present in the vicinity thereof.
  • the surface 24 of the fluororesin layer in contact with the metal substrate 22 and the fluororesin present in the vicinity thereof have an uncrosslinked structure having a two-dimensional structure.
  • the content of the three-dimensional structure of the fluororesin existing between the surface 23 and the surface 24 in contact with the substrate is continuous from the surface 23 of the fluororesin layer toward the surface 24 in contact with the substrate. It has become less.
  • FIG. 2 shows a cross-sectional view of another sliding layer formed on the substrate.
  • FIG. 2 shows an example in which the cross section of the sliding layer is a uniform material.
  • the sliding layer 21 consists of a crosslinked fluororesin layer formed on the surface 22 of the iron-based metal substrate.
  • the sliding layer 21 made of a crosslinked fluororesin has a crosslinked structure consisting of a three-dimensional structure from the surface 24 in contact with the metal substrate to the surface 23 of the sliding layer.
  • Examples of the base material that can be used for the rolling bearing cage of the present invention include an aluminum material, an iron-based metal material, a polyimide material, or a ceramic material.
  • a ferrous metal material is preferable as the rolling bearing cage.
  • the iron-based metal material include bearing steel used for rolling bearings, carburized steel, carbon steel for machine structure, cold rolled steel, hot rolled steel, and the like.
  • the ferrous metal material is adjusted to a predetermined surface hardness by quenching and tempering after processing into the shape of the cage.
  • a ferrous metal material cage using chromium molybdenum steel (SCM415) it is preferable to use an ferrous metal material whose Hv value is adjusted to 484 to 595.
  • the sliding layer is made of a fluororesin layer formed on the surface of the iron-based metal material.
  • fluororesins include PTFE, tetrafluoroethylene-perfluoro (alkyl vinyl ether) copolymer (hereinafter referred to as PFA), tetrafluoroethylene-hexafluoropropylene copolymer (hereinafter referred to as FEP), ethylene-tetrafluoroethylene copolymer.
  • PFA tetrafluoroethylene-perfluoro (alkyl vinyl ether) copolymer
  • FEP tetrafluoroethylene-hexafluoropropylene copolymer
  • ethylene-tetrafluoroethylene copolymer examples include polymers, polyvinylidene fluoride, and polyvinyl fluoride. These resins can be used alone or as a mixture. Of these, PTFE which is excellent in heat resistance and slidability is preferable.
  • the fluororesin layer before cross-linking can be produced by applying and drying, followed by baking using an aqueous dispersion in which PTFE resin particles are dispersed.
  • the aqueous dispersion may contain a nonionic surfactant such as polyoxyethylene alkyl ether, an inorganic pigment such as carbon black, and water as a main solvent.
  • an antifoamer, a desiccant, a thickener, a leveling agent, a repellency inhibitor, etc. can be mix
  • the cross-linked fluororesin layer is a cross-linked fluororesin layer in which at least the surface and the vicinity thereof are cross-linked.
  • a method for forming the sliding layer on the surface of the iron-based metal material will be described below.
  • the roughness (Ra) of the metal material surface is adjusted in advance to 1.0 to 2.0 ⁇ m using shot blasting before forming the sliding layer. Thereafter, it is preferably immersed in an organic solvent such as petroleum benzine and subjected to ultrasonic degreasing for about 5 minutes to 1 hour.
  • aqueous coating solution for forming the fluororesin layer Before the aqueous coating solution for forming the fluororesin layer, in order to improve the dispersibility of the aqueous dispersion, it is rotated for 1 hour at, for example, 40 rpm using a ball mill. Redistribute. The re-dispersed aqueous coating solution is filtered using a 100 mesh wire net and painted using a spray method. (3) Drying of aqueous coating solution for forming the fluororesin layer The aqueous coating solution is applied and then dried. As drying conditions, for example, drying in a thermostat at 90 ° C. for about 30 minutes is preferable.
  • the layer thickness of the fluororesin layer after drying is 5 ⁇ m or more and less than 40 ⁇ m, preferably 15 to 30 ⁇ m. If the thickness is less than 5 ⁇ m, the metal substrate may be exposed due to peeling or initial wear due to poor adhesion of the coating. If it is 40 ⁇ m or more, cracks during film formation or peeling during operation may deteriorate the lubrication state.
  • any coating method can be used as long as it can form a film such as a dipping method and a brush coating method in addition to the spray method.
  • the spray method is preferable in view of making the surface roughness and coating shape of the coating as small as possible and considering the uniformity of the layer thickness.
  • Examples of radiation include ⁇ rays (particle beams of helium-4 nuclei emitted from radionuclides that undergo ⁇ decay), ⁇ rays (negative electrons and positrons emitted from nuclei), and electron beams (almost constant kinetic energy).
  • Particle beam such as electron beam, generally generated by accelerating thermionic electrons in vacuum; gamma ray (emitted and absorbed by transitions between energy levels of nuclei and elementary particles, pair annihilation of elementary particles, pair production, etc.) Ionizing radiation such as an electromagnetic wave having a short wavelength).
  • electron beams and ⁇ rays are preferable, and electron beams are more preferable.
  • an electron beam has advantages such as easy availability of an electron beam irradiation apparatus, simple irradiation operation, and the ability to employ a continuous irradiation process.
  • the cross-linking of the fluororesin layer does not proceed sufficiently except in the temperature range where the irradiation temperature is 30 ° C. lower than the melting point of the fluororesin layer to 50 ° C. higher than the melting point.
  • the range of oxygen concentration is preferably 0 to 300 ppm.
  • an inert atmosphere by nitrogen gas injection is preferable from the viewpoint of operability and cost.
  • the irradiation dose is 250 kGy or less, crosslinking is insufficient, the wear amount is large, and the metal substrate may be exposed.
  • the irradiation dose exceeds 750 kGy crosslinking proceeds more than necessary, and the hardness of the coating increases, so that the coating becomes brittle and damage to the coating such as peeling may easily occur.
  • the acceleration voltage upon irradiation is 40 kV or more and 500 kV Less than, preferably 50 to 100 kV. If it is less than 40 kV, the penetration of the electron beam into the vicinity of the surface layer of the fluororesin layer becomes shallow, and if it is 500 kV or more, the entire fluororesin layer is cross-linked.
  • the intensity of the radiation attenuates inside the polymer, so that the radiation can reach the irradiated surface sufficiently, but the other surface cannot be tilted.
  • the acceleration voltage when irradiated is preferably 500 kV or more, preferably 800 to 1200 kV.
  • the fluororesin layer is irradiated with radiation at this acceleration voltage, the radiation reaches all layer surfaces from the irradiated surface to the substrate surface, and a crosslinked fluororesin layer crosslinked from the surface to the substrate surface is obtained.
  • the layer thickness of the sliding layer obtained by the method described above is 5 ⁇ m or more and less than 40 ⁇ m, preferably 15 ⁇ m or more and less than 30 ⁇ m. If the layer thickness is less than 5 ⁇ m, the metal substrate may be exposed due to peeling due to poor adhesion of the coating or due to initial wear. If it is 40 ⁇ m or more, cracks during film formation or peeling during operation may deteriorate the lubrication state. By setting the layer thickness in the range of 5 ⁇ m or more and less than 40 ⁇ m, it is possible to prevent the metal substrate from being exposed due to initial wear and to prevent peeling during operation over a long period of time.
  • the fluororesin layer used in the present invention has a crosslinked structure.
  • a fluorine-based resin particularly a PTFE resin
  • a PTFE resin is chemically very stable and extremely stable against an organic solvent, so that it is difficult to identify the molecular structure or molecular weight.
  • the PTFE resin forms a three-dimensional structure by cross-linking, it becomes more difficult to dissolve in a solvent, and structural analysis becomes more difficult.
  • 19 F Magical Angle Spinning (MAS) Nuclear Magnetic Resonance (NMR) Method High Speed Magnetic Nuclear Resonance
  • Test piece A PTFE resin layer was formed on a metal flat plate of 30 mm ⁇ 30 mm and 2 mm thickness made of SPCC. As the PTFE resin layer, a top coating (model number: EK-3700C21R) manufactured by Daikin was used. The drying time was 30 minutes in a constant temperature bath at 90 ° C., followed by baking in a heating furnace at 380 ° C. for 30 minutes.
  • Test piece coating test example A1 PTFE coating (irradiation dose: 0 kGy, layer thickness: 20 ⁇ m)
  • Experimental Example A2 PTFE coating (irradiation dose: 500 kGy, layer thickness: 20 ⁇ m)
  • Experimental Example A3 PTFE coating (irradiation dose: 1000 kGy, layer thickness: 20 ⁇ m)
  • NMR measurement was performed using an NMR device JNM-ECX400 manufactured by JEOL Ltd., using a suitable measurement nuclide ( 19 F), resonance frequency (376.2 MHz), MAS (Magic Angle Spinning) rotation speed (15 and 12 kHz), sample amount (about 70 ⁇ L in a 4 mm solid state NMR tube), waiting time (10 seconds) and measurement temperature (about 24 ° C.).
  • FIGS. 3 shows NMR of Experimental Example A1
  • FIG. 4 shows NMR of Experimental Example A2
  • FIG. 5 shows an enlarged view of the NMR chart of Experimental Example A3.
  • the upper row represents the MAS rotational speed 15 kHz
  • the lower row represents the MAS rotational speed 12 kHz.
  • FIG. 6 is a graph obtained by normalizing the signal intensity at ⁇ 82 ppm, the intensity of which increases with crosslinking, with the signal intensity at ⁇ 122 ppm as the main signal.
  • the upper part represents the measured value
  • the lower part represents the graph. It is considered that the higher the signal intensity ratio is, the more the degree of crosslinking proceeds.
  • ⁇ 122 ppm is the signal of the F atom in the —CF 2 —CF 2 — bond
  • ⁇ 82 ppm is the signal of the F atom of —CF 3 in the —CF 2 —CF 3 bond. Therefore, the signals of ⁇ 82 ppm and ⁇ 162 ppm at a MAS rotational speed of 15 kHz, and ⁇ 58 ppm, ⁇ 90 ppm, ⁇ 154 ppm and ⁇ 186 ppm at a MAS rotational speed of 12 kHz are spinning side bands (SSB). A broad signal is observed in the range of ⁇ 122 ppm to ⁇ 130 ppm hidden by the ⁇ 122 ppm signal.
  • SSB spinning side bands
  • This signal is the signal of the F atom of —CF 2 — in the —CF 2 —CF 3 bond that should be observed at ⁇ 126 ppm. Therefore, the uncrosslinked PTFE resin layer not irradiated with radiation is an NMR chart having signals of ⁇ 122 ppm attributed to —CF 2 —CF 2 — bonds, ⁇ 82 ppm and ⁇ 126 ppm attributed to —CF 2 —CF 3. expressed.
  • a solid 19 F MAS NMR of a PTFE resin layer (Experimental Example A2, 500 kGy) irradiated with a radiation dose of 500 kGy was measured under the same conditions as those for the uncrosslinked PTFE resin layer, and ⁇ 68 ppm and ⁇ 70 ppm except for the spinning sideband. , ⁇ 80 ppm, ⁇ 82 ppm, ⁇ 109 ppm, ⁇ 112 ppm, ⁇ 122 ppm, ⁇ 126 ppm, ⁇ 152 ppm, and ⁇ 186 ppm were observed (FIG. 4 top and FIG. 4 bottom).
  • the normalized signal intensity ratio increases as the irradiation dose increases.
  • the irradiation dose was 500 kGy, a clearly crosslinked structure appeared, and when the irradiation dose was doubled to 1000 kGy, the normalized signal intensity ratio was about three times, indicating that the crosslinking was more advanced.
  • the PTFE resin gradient material has a chemical shift value ( ⁇ ppm) appearing in a solid 19 F Magic angle Spinning (MAS) nuclear magnetic resonance (NMR) chart as compared with the uncrosslinked PTFE resin.
  • MAS Magic angle Spinning
  • NMR nuclear magnetic resonance
  • at least one chemical shift value selected from ⁇ 68 ppm, ⁇ 70 ppm, ⁇ 77 ppm, ⁇ 80 ppm, ⁇ 109 ppm, ⁇ 112 ppm, ⁇ 152 ppm, and ⁇ 186 ppm appears.
  • the surface layer has a three-dimensional structure in which the signal intensity of the chemical shift value appearing at ⁇ 82 ppm is increased as compared with the signal intensity of the uncrosslinked PTFE resin.
  • Test piece A PTFE resin layer was formed on a metal plate having a thickness of 30 mm ⁇ 30 mm and a thickness of 2 mm made by SPCC using a top coating made by Daikin (model number: EK-3700C21R). The drying time was 30 minutes in a constant temperature bath at 90 ° C., followed by baking in a heating furnace at 380 ° C. for 30 minutes. Thereafter, the specimen was irradiated with an electron beam from the surface of the PTFE resin layer under the following conditions.
  • Atmosphere in chamber at the time of irradiation heated nitrogen
  • Electron flow 8.1 mA for Experimental Example B2, 12.7 mA for Experimental Example B3, Experimental Example B4, Experimental Example B5, and Experimental Example B6
  • Irradiation width (conveyor moving direction): 27.5cm
  • Test piece coating experiment example B1 PTFE coating (irradiation dose: 0 kGy, layer thickness: 20 ⁇ m)
  • Experimental Example B2 PTFE coating (irradiation dose: 85 kGy, layer thickness: 20 ⁇ m)
  • Experimental Example B3 PTFE coating (irradiation dose: 250 kGy, layer thickness: 20 ⁇ m)
  • Experimental Example B4 PTFE coating (irradiation dose: 500 kGy, layer thickness: 20 ⁇ m)
  • Experimental Example B5 PTFE coating (irradiation dose: 750 kGy, layer thickness: 20 ⁇ m)
  • Experimental Example B6 PTFE coating (irradiation dose: 1000 kGy, layer thickness: 20 ⁇ m)
  • At least one chemical shift selected from -68 ppm, -70 ppm, -77 ppm, -80 ppm, -109 ppm, -112 ppm, -152 ppm, and -186 ppm It can be said that it has a three-dimensional structure in which the value appears or the signal intensity of the chemical shift value appearing at ⁇ 82 ppm is increased compared to the signal intensity of the uncrosslinked PTFE resin.
  • FIG. 7 shows the structure of a rolling bearing cage having the sliding layer.
  • FIG. 7 is a perspective view of a ferrous metal cage for a rolling bearing using needle rollers as rolling elements.
  • the cage 1 is provided with pockets 2 for holding needle rollers, and each needle is composed of a column portion 3 positioned between the pockets and both side annular portions 4 and 5 for fixing the column portion 3. Maintain the distance between the rollers.
  • the column portion 3 is bent into a mountain fold or a valley fold at the center portion of the column portion, and has a complicated shape of a flat plate having a circular bulge in a plan view at the joint portion with both annular portions 4 and 5. It is said that.
  • the manufacturing method of this cage is a method in which an annulus is cut out from a base material and a pocket 2 is formed by stamping by pressing, a flat plate is pressed, cut into an appropriate length, and then rolled into an annular shape.
  • a method of joining by welding can be employed.
  • a sliding layer of PTFE resin film is formed on the surface portion of the cage 1.
  • the surface portion of the cage that forms the sliding layer is a portion that contacts the lubricating oil or grease, and the sliding layer is formed on the entire surface of the cage 1 including the surface of the pocket 2 that contacts the needle roller. Is preferred.
  • FIG. 8 is a perspective view showing a needle roller bearing which is an embodiment of a rolling bearing.
  • the needle roller bearing 6 includes a plurality of needle rollers 7 and a cage 1 that holds the needle rollers 7 at regular intervals or at unequal intervals.
  • a shaft such as a crankshaft or a piston pin is directly inserted into the inner diameter side of the cage 1, and the outer diameter side of the cage 1 is a housing. It is used by being fitted into the engagement hole of a certain connecting rod. Since the needle roller 7 having no inner and outer rings and having a smaller diameter than the length is used as a rolling element, the needle roller bearing 6 is more compact than a general rolling bearing having inner and outer rings. Become.
  • FIG. 9 shows a longitudinal sectional view of a four-cycle engine using the needle roller bearing.
  • FIG. 9 is a longitudinal sectional view of a four-cycle engine using a needle roller bearing as an example of the rolling bearing of the present invention.
  • the intake valve 8a is opened, the exhaust valve 9a is closed, and an air-fuel mixture obtained by mixing gasoline and air is sucked into the combustion chamber 10 through the intake pipe 8, and the intake valve 8a is closed and the piston 11 is closed.
  • a compression stroke in which the air-fuel mixture is compressed an explosion stroke in which the compressed air-fuel mixture is exploded, and an exhaust stroke in which the exploded combustion gas is exhausted through the exhaust pipe 9 by opening the exhaust valve 9a.
  • the piston 11 that performs linear reciprocating motion by combustion in these strokes, the crankshaft 12 that outputs rotational motion, the connecting rod 13 that connects the piston 11 and the crankshaft 12, and converts linear reciprocating motion into rotational motion,
  • the crankshaft 12 rotates about the rotation center shaft 14 and balances rotation by a balance weight 15.
  • the connecting rod 13 is formed by providing a large end 16 below the linear rod and a small end 17 above.
  • the crankshaft 12 is rotatably supported via a needle roller bearing 6 a attached to the engagement hole of the large end portion 16 of the connecting rod 13.
  • the piston pin 18 that connects the piston 11 and the connecting rod 13 is rotatably supported via a needle roller bearing 6b attached to the engagement hole of the small end portion 17 of the connecting rod 13.
  • FIG. 8 illustrates a needle roller bearing as the bearing
  • the rolling bearing of the present invention is a cylindrical roller bearing, a tapered roller bearing, a self-aligning roller bearing, a needle roller bearing, a thrust cylindrical roller bearing, or a thrust cone other than those described above. It can also be used as a roller bearing, a thrust needle roller bearing, a thrust spherical roller bearing, a foil bearing and the like. In particular, it can be suitably used for a rolling bearing that is used in an oil-lubricated environment and uses a ferrous metal material cage.
  • Example 1 and Comparative Example 1 A needle bearing cage (base surface hardness Hv: 484 to 595) made of chromium molybdenum steel (SCM415) ⁇ 44 mm ⁇ width 22 mm, which has been quenched and tempered, was prepared and used for the formation of the PTFE resin layer used in Experimental Example A1.
  • the PTFE surface sliding layer was coated, dried, and fired under the same conditions as in Experimental Example A1, except that the coating liquid was the same as the coating liquid and the thickness of the coating layer was changed to the thickness shown in Table 1.
  • the electron beam irradiation is performed with the irradiation dose shown in Table 1, and the PTFE inclination of the three-dimensional structure to the two-dimensional structure is directed from the surface of the coating layer to the surface on the substrate side.
  • Material was used.
  • “two-dimensional ⁇ three-dimensional PTFE” represents a PTFE structure from the surface on the substrate side to the surface. Comparative Example 1 was not irradiated as in Experimental Example A1.
  • the surface treated needle bearing cage was evaluated by the following method.
  • An outline of the wear amount test apparatus is shown in FIG. In a state where a concave mating member 19 made of SUJ2 and quenched and tempered HRC62 and having a concave surface roughness of 0.1 to 0.2 ⁇ mRa is pressed from the vertical direction to the cage 1 attached to the rotary shaft with a predetermined load 20, together with the rotary shaft
  • the friction characteristics of the coating applied to the surface of the cage 1 were evaluated by rotating the cage 1, and the amount of wear was measured.
  • the measurement conditions are load: 440 N, lubricating oil: mineral oil (10W-30), sliding speed: 930.6 m / min, measurement time: 100 hours.
  • the adhesiveness of the PTFE coating was also evaluated by visually observing the amount of peeling at that time.
  • the peeling amount is “large” when the peeling area at the maximum peeling location is 1 mm 2 or more, and the “small” is when the peeling area at the maximum peeling location is less than 1 mm 2 .
  • the radius of the concave R portion was set to a size 20 to 55 ⁇ m larger than the cage radius. Lubricating oil was used in an amount soaking up to half the height of the cage. The results are shown in Table 1.
  • the cage for rolling bearings of the present invention can suppress wear even under conditions of high sliding speed and high surface pressure in lubricating oil, and is particularly used in lubricating oil using a ferrous metal material cage. And can be used in the field of rolling bearings using this cage.

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Abstract

L'invention concerne un palier à rouleaux et un dispositif de retenue, le palier à rouleaux présentant une surface de glissement aux propriétés de glissement excellentes, même dans des conditions de vitesse de glissement élevée et d'huile lubrifiante à haute pression superficielle. Le dispositif de retenue retient l'élément du palier à rouleaux utilisé dans un environnement d'huile lubrifiante, et est constitué d'un matériau de base et d'une couche de glissement formée sur la surface du matériau de base. La couche de glissement est une couche de résine fluorée dans laquelle soit : (1) la résine fluorée a une structure tridimensionnelle dans la surface de la couche de glissement, la couche de résine fluorée ne venant pas en contact avec le matériau de base et dans les couches proximales à celui-ci; la résine fluorée a une structure bidimensionnelle dans la surface où la couche de résine fluorée vient en contact avec le matériau de base et dans les couches proximales à celui-ci, et le rapport de la structure tridimensionnelle de la résine fluorée diminue progressivement de la surface de couche de glissement vers la surface en contact avec le matériau de base; soit (2) la structure tridimensionnelle de la résine fluorée est continue, de la surface de couche de glissement vers la surface en contact avec le matériau de base.
PCT/JP2016/072798 2015-08-03 2016-08-03 Dispositif de retenue de palier à rouleaux et palier à rouleaux WO2017022794A1 (fr)

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Application Number Priority Date Filing Date Title
JP2015-153733 2015-08-03
JP2015153734A JP2017032093A (ja) 2015-08-03 2015-08-03 転がり軸受用保持器および転がり軸受
JP2015-153734 2015-08-03
JP2015153733A JP2017032092A (ja) 2015-08-03 2015-08-03 転がり軸受用保持器および転がり軸受

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JP2008286375A (ja) * 2007-05-21 2008-11-27 Ntn Corp 摺動部材用組成物および転がり軸受
JP5454903B2 (ja) * 2010-02-19 2014-03-26 株式会社レイテック 傾斜材料製品ならびにその製造方法

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Publication number Priority date Publication date Assignee Title
CN112020616A (zh) * 2018-04-27 2020-12-01 Thk株式会社 分离体、机械元件、运动引导装置及产业用机械
US11028261B2 (en) 2018-04-27 2021-06-08 Kureha Gohsen Co., Ltd. Separator, mechanical element, operation guide device and manufacturing apparatus
DE112019001684B4 (de) 2018-04-27 2023-11-09 Thk Co., Ltd. Abstandhalter, mechanisches Element, Betriebsführungsvorrichtung und Fertigungsvorrichtung

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