WO2020129319A1 - Élément coulissant - Google Patents

Élément coulissant Download PDF

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Publication number
WO2020129319A1
WO2020129319A1 PCT/JP2019/033903 JP2019033903W WO2020129319A1 WO 2020129319 A1 WO2020129319 A1 WO 2020129319A1 JP 2019033903 W JP2019033903 W JP 2019033903W WO 2020129319 A1 WO2020129319 A1 WO 2020129319A1
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WO
WIPO (PCT)
Prior art keywords
particles
molybdenum disulfide
barium sulfate
average particle
sliding member
Prior art date
Application number
PCT/JP2019/033903
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English (en)
Japanese (ja)
Inventor
慎司 松本
壁谷　泰典
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大豊工業株式会社
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Publication of WO2020129319A1 publication Critical patent/WO2020129319A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • 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
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • 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
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
    • F16C3/06—Crankshafts
    • 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
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • 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
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • 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
    • F16C9/00—Bearings for crankshafts or connecting-rods; Attachment of connecting-rods
    • F16C9/02—Crankshaft bearings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

Definitions

  • the present invention relates to a sliding member having a resin coating layer.
  • Patent Document 1 A sliding bearing is known in which a resin binder contains adjusted particles and a plate-like solid lubricant (see Patent Document 1).
  • Patent Document 1 describes that the adjustment particles prevent the cracks and the plate-like solid lubricant improves the seizure resistance.
  • Patent Document 1 when a flaw is formed by a foreign substance, there is a problem that seizure easily occurs around the flaw. That is, when a flaw is formed by a foreign substance, the circumference of the flaw rises to form a convex portion, and there is a problem that seizure is likely to occur due to frictional heat concentrated in the convex portion.
  • the present invention has been made in view of the above problems, and an object thereof is to provide a technique capable of exhibiting high seizure resistance even when a scratch is formed.
  • the sliding member of the present invention is a sliding member comprising a base layer and a resin coating layer formed on the base layer, the resin coating layer is a polyamide-imide resin as a binder. , Molybdenum disulfide particles, barium sulfate particles having a total volume of not less than 0.35 times and not more than 0.8 times the total volume of molybdenum disulfide particles, and unavoidable impurities.
  • the barium sulfate particles contained in the resin coating layer are transferred to the mating material. It will be easier. By transferring barium sulfate to the mating material, the mating material can be coated with barium sulfate. Furthermore, it was also confirmed that at the location where barium sulfate was transferred, the components of the lubricating oil were also easily transferred to the mating material. Therefore, even if a convex portion is formed in the vicinity of a scratch formed by a foreign substance, it is possible to reduce the possibility that seizure will occur at the convex portion.
  • the average particle size of the barium sulfate particles may be 0.3 ⁇ m or more and less than 0.7 ⁇ m. It was confirmed that by setting the average particle size of the barium sulfate particles to 0.3 ⁇ m or more and less than 0.7 ⁇ m, the frictional resistance with the mating shaft can be reduced. It was also confirmed that the smoothness of the surface can be improved by setting the average particle diameter of the barium sulfate particles to 0.3 ⁇ m or more and less than 0.7 ⁇ m. Further, it has been confirmed that it is optimal that the average particle diameter of the barium sulfate particles is 0.3 ⁇ m or more and less than 0.7 ⁇ m in terms of improving seizure resistance.
  • FIG. 2A and 2B are schematic cross-sectional views of the overlay. It is a schematic diagram of a reciprocating sliding test. It is a map of the elements transferred to the mating material.
  • 5A to 5C are graphs of transfer amount.
  • 6A to 6C are graphs of the coefficient of friction.
  • 7A to 7C are graphs of the frictional resistance reduction rate.
  • 8A to 8C are graphs of Rpk(0.08).
  • 9A to 9C are graphs of Ra(0.8).
  • 10A to 10C are graphs of the orientation rate.
  • 11A and 11B are graphs of seizure surface pressure.
  • FIG. 1 is a perspective view of a sliding member 1 according to an embodiment of the present invention.
  • the sliding member 1 includes a back metal 10, a lining 11, and an overlay 12.
  • the sliding member 1 is a half-divided metal member obtained by dividing a hollow cylinder into two equal parts in the diametrical direction, and has a semicircular arc-shaped cross section.
  • the sliding bearing A is formed by combining the two sliding members 1 into a cylindrical shape.
  • the slide bearing A bears a cylindrical mating member 2 (engine crankshaft) in a hollow portion formed inside.
  • the outer diameter of the mating member 2 is slightly smaller than the inner diameter of the slide bearing A.
  • Lubricating oil engine oil
  • the sliding member 1 has a structure in which a back metal 10, a lining 11, and an overlay 12 are sequentially stacked in the order of increasing distance from the center of curvature. Therefore, the back metal 10 constitutes the outermost layer of the sliding member 1, and the overlay 12 constitutes the innermost layer of the sliding member 1.
  • the back metal 10, the lining 11, and the overlay 12 each have a constant thickness in the circumferential direction.
  • the back metal 10 has a thickness of 1.1 mm to 1.3 mm
  • the lining 11 has a thickness of 0.2 mm to 0.4 mm.
  • the back metal 10 is made of steel, for example.
  • the lining 11 is made of, for example, an Al alloy or a Cu alloy.
  • the back metal 10 may be omitted.
  • the thickness of the overlay 12 is 6 ⁇ m.
  • the thickness of the overlay 12 may be 2 to 15 ⁇ m, preferably 3 to 9 ⁇ m.
  • the inner side means the side of the center of curvature of the sliding member 1
  • the outer side means the side opposite to the center of curvature of the sliding member 1.
  • the inner surface of the overlay 12 constitutes the sliding surface of the mating member 2.
  • FIG. 2A is a schematic sectional view of the overlay 12.
  • the overlay 12 is a layer laminated on the inner surface of the lining 11 and constitutes the resin coating layer of the present invention.
  • the overlay 12 includes a binder resin 12a (gray), molybdenum disulfide particles 12b (black circles), barium sulfate particles 12c (white circles), and inevitable impurities.
  • the binder resin 12a is a polyamide-imide resin.
  • the volume fraction of the total volume of the molybdenum disulfide particles 12b in the overlay 12 is 30% by volume, and the volume fraction of the total volume of the barium sulfate particles 12c is 15% by volume.
  • the molybdenum disulfide particles 12b have a total volume of 0.5 times the total volume of the barium sulfate particles 12c.
  • the total volume of the binder resin 12a, the molybdenum disulfide particles 12b, and the total volume of the barium sulfate particles 12c are the masses of the binder resin 12a, the molybdenum disulfide particles 12b, and the barium sulfate particles 12c measured before mixing, and their specific gravities. It is calculated based on
  • the molybdenum disulfide particles 12b have an average particle size of 1.4 ⁇ m, and the barium sulfate particles 12c have an average particle size of 0.6 ⁇ m.
  • the molybdenum disulfide particles 12b have an average particle diameter of 2.33 times the average particle diameter of the barium sulfate particles 12c, and the average particle diameters of the molybdenum disulfide particles 12b and the molybdenum disulfide particles 12b are according to MT3300II of Microtrac Bell. It was measured.
  • the molybdenum disulfide particles 12b are layered particles, and the barium sulfate particles 12c are agglomerated particles.
  • the overlay 12 is composed of two coating layers (the outermost layer L1 and the inner layer L2) that are overcoated, and the thicknesses of the outermost layer L1 and the inner layer L2 are each 3 ⁇ m.
  • Rpk, Ra are the surface roughness of JIS B0671-2002 and JIS B0601-2001, respectively, and the surface roughness of the surface (sliding surface) of the overlay 12.
  • Rpk(0.08) was 0.162 ⁇ m
  • Ra(0.8) was 0.151 ⁇ m. ..
  • Rpk and Ra were measured by a surf coder SE-3400 manufactured by Kosaka Research Institute.
  • the ⁇ 002 ⁇ 004 ⁇ 008 ⁇ orientation ratio of molybdenum disulfide in the overlay 12 of the present embodiment was 87%. Moreover, the orientation rate of ⁇ 002 ⁇ 004 ⁇ 006 ⁇ 008 ⁇ of molybdenum disulfide in the overlay 12 of the present embodiment was 89.9%.
  • the orientation ratio is the sum of the intensities of diffracted electron beams of X-rays generated on the crystal plane of ⁇ 002 ⁇ 004 ⁇ 008 ⁇ or ⁇ 002 ⁇ 004 ⁇ 006 ⁇ 008 ⁇ of molybdenum disulfide, It is the ratio divided by the total of the intensities of the diffracted electron beams generated on all the crystal planes.
  • the orientation ratio is an index showing how much the crystal planes of ⁇ 002 ⁇ 004 ⁇ 008 ⁇ or ⁇ 002 ⁇ 004 ⁇ 006 ⁇ 008 ⁇ are orientated in a direction orthogonal to the surface of the overlay 12. is there.
  • the intensity of the diffracted electron beam was measured by SmartLab manufactured by Rigaku Corporation. The higher the orientation rate, the higher the parallelism of the molybdenum disulfide particles 12b to the sliding surface in the layer direction.
  • the film thickness of the outermost layer L1 of the multiple coating layers By setting the film thickness of the outermost layer L1 of the multiple coating layers to be 3 ⁇ m, the shrinkage amount of the binder resin 12a during curing of the outermost layer L1 can be suppressed. Therefore, it is possible to reduce unevenness between the portion where the molybdenum disulfide particles 12b are present and the portion where the molybdenum disulfide particles 12b are not present. Further, by setting the thickness of the outermost layer to be 2 times or less the average particle diameter of the molybdenum disulfide particles 12b, that is, 4 ⁇ m or less (desirably 1 to 2.5 ⁇ m), the layer direction of the layered molybdenum disulfide particles 12b is set. It can be oriented in the coating direction (direction of the sliding surface).
  • the thickness direction of the molybdenum disulfide particles 12b can be oriented in the direction orthogonal to the coating direction, that is, the contraction direction of the binder during curing. As a result, the thickness of the molybdenum disulfide particles 12b in the shrinking direction of the binder can be suppressed, and the unevenness between the portion where the molybdenum disulfide particles 12b exist and the portion where the molybdenum disulfide particles 12b do not exist can be reduced. It was
  • the overlay 12 is formed of a single coating layer, as shown in FIG. 2B, the rotational freedom of the molybdenum disulfide particles 12b during coating is increased, and the layer direction of the molybdenum disulfide particles 12b is perpendicular to the sliding surface. Can be oriented in a direction close to. As a result, the height of the unevenness increases due to the difference in the amount of contraction between the molybdenum disulfide particles 12b and the binder resin 12a in the direction orthogonal to the sliding surface.
  • FIG. 3 is a schematic diagram of the ball-on-plate testing machine 100.
  • the sample S was reciprocally moved with the overlay 12 of the sample S being in contact with the ball 110 formed of the same kind of material as the mating material (SUJ2 of JIS4805).
  • the one-way distance of reciprocating movement was set to 20 mm, and the reciprocal sliding test was continued up to 50 reciprocations.
  • a static load was applied to the ball 110 so that a vertical load of 9.8 N from the ball 110 was applied to the sample S. Further, the contact point between the sample S and the ball 110 was immersed in engine oil (not shown, for example, 0W-20) at 140°C. A load sensor (not shown) is connected to the ball 110, and the frictional force acting on the ball 110 in the sliding direction was measured by a load sensor (not shown). Then, the friction coefficient was measured by dividing the frictional force by the vertical load.
  • the friction coefficient at the first reciprocation was 0.092, and the friction coefficient at the 50th reciprocation was 0.044, which was good.
  • the reduction rate of the friction coefficient obtained by subtracting the final friction coefficient at the 50th reciprocation from the initial friction coefficient at the 1st reciprocation was divided by the initial friction coefficient, and the frictional resistance reduction rate was as good as 47.513%.
  • the outermost surface layer L1 has a small Rpk and has a smooth sliding surface, it is considered that good friction coefficient and friction resistance reduction rate were obtained.
  • each element transferred to the part of the ball 110 where the sample S slid was quantitatively analyzed.
  • the amount of element (transfer amount) was measured by JXA-8100 manufactured by JEOL Ltd.
  • FIG. 4 is a photograph showing the result of quantitative analysis in the analysis range on the ball 110 on which the sample S slides.
  • the lighter the shade of gray the greater the amount of each element present on the surface of the ball 110.
  • three analysis ranges were analyzed so as to be continuous in the vertical direction on the paper surface. As shown in FIG. 4, it can be confirmed that Ba derived from the barium sulfate particles 12c contained in the sample S has transferred to the surface of the ball 110.
  • Ba is a component that is not included in either the ball 110 or the lubricating oil
  • the transfer amount, the friction coefficient, and the friction resistance reduction rate were measured.
  • the material of the mating material 2 was SUJ2 of JIS4805.
  • ⁇ A linear scratch was previously formed on the sliding member 1 in the circumferential direction.
  • the scratch is a portion where the surface of the sliding member 1 is recessed, but the surface of the sliding member 1 rises in a ridge shape on both sides in the width direction of the scratch along the scratch, so that a pair of convex portions are formed. It is formed. Scratches were formed so that the average of the width (the length from the end of the hem of one protrusion to the end of the hem of the other protrusion) and the height of the pair of protrusions was 500 ⁇ m and 40 ⁇ m, respectively. In this convex portion, frictional heat between the ball 110 and the sample S is concentrated and generated, so that the seizure surface pressure is reduced.
  • the relative speed between the sliding member 1 and the mating member 2 was set to 20 m/s, and 140° C. engine oil (not shown, for example, 0W-20) was supplied between the sliding member 1 and the mating member 2.
  • the supply amount of engine oil was set to 1 L/min.
  • a static load is applied to the sliding member 1 so that a vertical load in the diametrical direction is applied to the sliding member 1, and the vertical load is increased by 3 kN every 3 minutes.
  • the seizure surface pressure was derived from the vertical load when seizure finally occurred. As a result, a favorable seizure surface pressure of 86 MPa was obtained. It was determined that seizure had occurred when the frictional force acting on the mating member 2 was 10 N or more.
  • the mating material can be coated with the barium sulfate particles 12c. Further, it was also confirmed that at the location where the barium sulfate particles 12c were transferred, the components of the lubricating oil were also easily transferred to the mating material. Therefore, even if a convex portion is formed in the vicinity of a scratch formed by a foreign substance, it is possible to reduce the possibility that seizure will occur due to coating with the transfer component. As a result, a good seizure surface pressure was obtained.
  • the sliding member 1 is (a) a half-divided substrate forming step, (b) a coating pretreatment step, (c) a first coating step, (d) a second coating step, (e) a drying step, and (f) a firing step. It formed by performing and in order.
  • the manufacturing method of the sliding member 1 is not limited to the above steps.
  • the half-divided base material forming step is a step of forming a base material in which the back metal 10 and the lining 11 are joined into a half-divided shape.
  • the base material in which the backing metal 10 and the lining 11 are joined may be formed by sintering the material of the lining 11 on a plate material corresponding to the backing metal 10.
  • a plate material corresponding to the back metal 10 and the lining 11 may be bonded by rolling to form a base material in which the back metal 10 and the lining 11 are bonded.
  • the base material in which the backing metal 10 and the lining 11 are joined may be processed into a half shape by performing mechanical processing such as pressing or cutting.
  • the coating pretreatment step is a surface treatment for improving the adhesion of the overlay 12 (resin coating layer) to the surface of the lining 11.
  • surface roughening treatment such as sandblasting may be performed, or chemical treatment such as etching or chemical conversion treatment may be performed.
  • the pretreatment process for coating is preferably performed after degreasing the oil content of the half-divided base material with a cleaning agent.
  • the first coating step is a step of coating the inner layer L2 of the overlay 12 on the lining 11.
  • a coating liquid is prepared by mixing the polyamideimide binder resin with the molybdenum disulfide particles 12b and the barium sulfate particles 12c. Further, in order to enhance the dispersibility of the molybdenum disulfide particles 12b and the barium sulfate particles 12c and to adjust the viscosity of the coating liquid, a solvent such as N-methyl-2-pyrrolidone or xylene is used if necessary. Good.
  • the volume ratio of the total volume of the molybdenum disulfide particles 12b in the overlay 12 is 30% by volume, and the volume ratio of the total volume of the barium sulfate particles 12c is 15% by volume. Mix with the coating solution. Further, molybdenum disulfide particles 12b having an average particle diameter of 1.4 ⁇ m and barium sulfate particles 12c having an average particle diameter of 0.6 ⁇ m are mixed with the coating liquid.
  • the first coating step is performed by attaching the coating liquid to a cylindrical coating roll having a diameter smaller than the inner diameter of the lining 11 and rotating the coating roll on the inner surface of the lining 11.
  • the coating liquid is applied to the inner surface of the lining 11 by a thickness such that the film thickness after the (g) baking step described later is 3 ⁇ m. It may be applied on top.
  • the drying step is a step of drying the outermost layer L1 and the inner layer L2.
  • the outermost layer L1 and the inner layer L2 are dried at 40 to 120° C. for 5 to 60 minutes.
  • Table 1 is a table showing the results of various measurements performed on Samples 1 to 9. The method of measuring various measured values of Sample 1 to Sample 9 is the same as the method of measuring various measured values in the first embodiment.
  • Samples 1 to 9 are samples S covered with overlays 12 having different combinations of average particle sizes of molybdenum disulfide particles 12b and barium sulfate particles 12c.
  • Sample 5 is the same as in the first embodiment.
  • Samples 1 to 4 and 6 to 9 are the same as those in the first embodiment, except for the combination of the average particle diameters of the molybdenum disulfide particles 12b and the barium sulfate particles 12c.
  • the overlay 12 is formed by the two layers of the outermost layer L1 and the inner layer L2 each having a thickness of 3 ⁇ m.
  • the volume fraction of the molybdenum disulfide particles 12b in the overlay 12 was 30% by volume, and the volume fraction of the barium sulfate particles 12c was 15% by volume. ing.
  • FIGS. 5A to 5C are graphs showing the relationship between the average particle size and the transfer amount of molybdenum disulfide particles 12b and barium sulfate particles 12c.
  • the transfer amount is the amount of Ba transferred from the samples 1 to 9 to the ball 110 after the reciprocal sliding test.
  • the vertical axis in FIGS. 5A to 5C represents the transfer amount.
  • the horizontal axis of FIG. 5A shows the average particle diameter of the barium sulfate particles 12c
  • the horizontal axis of FIG. 5B shows the average particle diameter of the molybdenum disulfide particles 12b.
  • the horizontal axis of FIG. 5C shows the average particle size ratio.
  • the correlation between the average particle size of molybdenum disulfide particles 12b and barium sulfate particles 12c and the transfer amount is weak.
  • FIG. 5C there is a correlation between the average particle size ratio and the amount of transfer that can be expressed by a function that is convex upward. As shown in gray in FIG. 5C, it was found that a good transfer amount can be obtained by setting the average particle size ratio to 1.0 to 2.8. Further, as shown in Table 1, it was found that a good seizure surface pressure was obtained when the transfer amount was large.
  • FIGS. 6A to 6C are graphs showing the relationship between the average particle size of molybdenum disulfide particles 12b, the average particle size of barium sulfate particles 12c, and the friction coefficient.
  • the vertical axis in FIGS. 6A to 6C represents the coefficient of friction.
  • 7A to 7C are graphs showing the relationship between the average particle size of molybdenum disulfide particles 12b, the average particle size of barium sulfate particles 12c, and the frictional resistance reduction rate.
  • the vertical axis of FIGS. 6A to 6C represents the frictional resistance reduction rate.
  • the horizontal axes of FIGS. 6A and 7A represent the average particle diameter of the barium sulfate particles 12c
  • the horizontal axes of FIGS. 6B and 7B represent the average particle diameter of the molybdenum disulfide particles 12b
  • the horizontal axes of FIGS. 6C and 7C are the horizontal axes.
  • the average particle size ratio
  • FIG. 6C there is a correlation between the average particle size ratio and the friction coefficient that can be expressed by a function that is convex downward.
  • FIG. 7C there is a correlation between the average particle diameter ratio and the frictional resistance reduction rate that can be expressed by a function that is convex upward.
  • gray in FIGS. 6C and 7C it was found that by setting the average particle size ratio to 1.7 to 2.8, a good friction coefficient and a good friction resistance reduction rate can be obtained.
  • FIGS. 5C, 6C, and 7C it was found that when the amount of transferred Ba was large, the coefficient of friction and the reduction rate of frictional resistance were good.
  • FIGS. 8A to 8C are graphs showing the relationship between the average particle size of molybdenum disulfide particles 12b, the average particle size of barium sulfate particles 12c, and Rpk (0.08).
  • the vertical axis of FIGS. 8A to 8C represents Rpk (0.08).
  • 9A to 9C are graphs showing the relationship between the average particle size of molybdenum disulfide particles 12b, the average particle size of barium sulfate particles 12c, and Ra (0.8).
  • the vertical axis of FIGS. 9A to 9C represents Ra (0.8).
  • the horizontal axes of FIGS. 8A and 9A represent the average particle diameter of the barium sulfate particles 12c
  • the horizontal axes of FIGS. 8B and 9B represent the average particle diameter of the molybdenum disulfide particles 12b
  • the horizontal axes of FIGS. 8C and 9C are the horizontal axes.
  • the average particle size ratio is
  • FIGS. 8A and 9A there is a correlation between the average particle diameter of the barium sulfate particles 12c and Rpk(0.08), Ra(0.8) that can be expressed by a function convex downward.
  • Rpk As shown in gray in FIGS. 8A and 8A, it was found that good Rpk can be obtained by setting the average particle diameter of the barium sulfate particles 12c to 0.3 to 0.7 ⁇ m.
  • FIGS. 10A to 10C are graphs showing the relationship between the average particle size of molybdenum disulfide particles 12b, the average particle size of barium sulfate particles 12c, and the orientation rate.
  • the vertical axis in FIGS. 10A to 10C represents the orientation rate.
  • the orientation ratio is an index indicating the degree of parallelism with respect to the sliding surface of the molybdenum disulfide particles 12b in the layer direction.
  • the horizontal axis of FIG. 10A shows the average particle size of the barium sulfate particles 12c
  • the horizontal axis of FIG. 10B shows the average particle size of the molybdenum disulfide particles 12b
  • the horizontal axis of FIG. 10C shows the average particle size ratio.
  • the orientation rate increases as the average particle size of the molybdenum disulfide particles 12b increases.
  • the orientation rate increases as the average particle size of the barium sulfate particles 12c decreases. It is considered that the smaller the average particle diameter of the barium sulfate particles 12c is, the less the possibility that the barium sulfate particles 12c prevent the molybdenum disulfide particles 12b from being oriented so that the layer direction is parallel to the sliding surface.
  • FIG. 10C there is a strong first-order correlation between the average particle size ratio and the orientation rate.
  • Table 2 is a table showing the results of measuring the seizure surface pressure of Samples 11 to 20.
  • the measuring method of each seizure surface pressure of Samples 11 to 20 is the same as the measuring method of various measured values in the first embodiment. However, a seizure surface pressure (a seizure surface pressure with scratches) that was tested using the sliding member 1 with scratches similar to the first embodiment and a sliding member 1 without scratches were used. Both of the seizure surface pressures tested were measured.
  • FIGS. 11A and 11B are graphs showing the relationship between the content of barium sulfate particles 12c of molybdenum disulfide particles 12b and the seizure surface pressure.
  • the vertical axis in FIGS. 11A and 11B represents the seizure surface pressure.
  • the horizontal axis of FIG. 11A shows the content ratio of the barium sulfate particles 12c of the molybdenum disulfide particles 12b
  • the horizontal axis of FIG. 11B shows the content of the molybdenum disulfide particles 12b.
  • the content ratio is a ratio obtained by dividing the content of barium sulfate particles 12c by the molybdenum disulfide particles 12b.
  • FIG. 11A there is a correlation between the content ratio and the seizure surface pressure, which can be expressed by a convex function.
  • gray in FIG. 11A it was found that by setting the content ratio to 0.35 to 0.8, good seizure surface pressure can be obtained. That is, it was found that good seizure surface pressure was obtained by setting the total volume of the barium sulfate particles 12c to 0.35 times or more and 0.8 times or less of the total volume of the molybdenum disulfide particles 12b. This is considered to be because the barium sulfate particles contained in the resin coating layer were easily transferred to the mating material by setting the content ratio to 0.35 to 0.8.
  • the sliding member 1 constituting the sliding bearing A for bearing the crankshaft of the engine is exemplified, but the sliding member 1 of the present invention may form the sliding bearing A for other uses.
  • the sliding member 1 of the present invention may form a radial bearing such as a gear bush for a transmission or a piston pin bush/boss bush.
  • the sliding member of the present invention may be a thrust bearing, various washers, or a swash plate for a car air conditioner compressor.
  • the number of coating layers may be three or more.
  • SYMBOLS 1 Sliding member, 2... Counterpart material, 10... Backing metal, 11... Lining, 12... Overlay, 12a... Binder resin, 12b... Molybdenum disulfide particles, 12c... Barium sulfate particles, 100... Ball on plate tester, 110 ... Ball, A... Bearing, L1... Outermost layer, L2... Inner layer, S... Sample

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ocean & Marine Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Sliding-Contact Bearings (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Lubricants (AREA)

Abstract

Le problème décrit par la présente invention est de fournir une technologie qui permet d'obtenir une résistance au grippage élevée même lorsque des rayures sont formées. La solution selon la présente invention porte sur un élément coulissant qui est pourvu d'une couche de base et d'une couche de revêtement en résine formée sur la couche de base. La couche de revêtement en résine comprend : une résine polyamide-imide servant de liant; des particules de disulfure de molybdène; des particules de sulfate de baryum ayant un volume total qui est de 0,35 à 0,8 fois le volume total des particules de disulfure de molybdène; et des impuretés inévitables.
PCT/JP2019/033903 2018-12-17 2019-08-29 Élément coulissant WO2020129319A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018-235152 2018-12-17
JP2018235152A JP7216538B2 (ja) 2018-12-17 2018-12-17 摺動部材

Publications (1)

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WO2020129319A1 true WO2020129319A1 (fr) 2020-06-25

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JP (1) JP7216538B2 (fr)
WO (1) WO2020129319A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006152274A (ja) * 2004-10-27 2006-06-15 Toyota Industries Corp 摺動部材および摺動部材の製造方法
JP2011079921A (ja) * 2009-10-06 2011-04-21 Daido Metal Co Ltd 摺動用樹脂組成物
JP2011127015A (ja) * 2009-12-18 2011-06-30 Daido Metal Co Ltd 摺動用樹脂組成物
WO2012111774A1 (fr) * 2011-02-18 2012-08-23 大豊工業株式会社 Composition de matériau coulissant et élément coulissant
WO2013039177A1 (fr) * 2011-09-13 2013-03-21 大豊工業株式会社 Élément coulissant et composition de matériau coulissant
WO2013047800A1 (fr) * 2011-09-28 2013-04-04 大豊工業株式会社 Elément de glissement et composition de matière de glissement
JP2014031871A (ja) * 2012-08-06 2014-02-20 Daido Metal Co Ltd すべり軸受

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006152274A (ja) * 2004-10-27 2006-06-15 Toyota Industries Corp 摺動部材および摺動部材の製造方法
JP2011079921A (ja) * 2009-10-06 2011-04-21 Daido Metal Co Ltd 摺動用樹脂組成物
JP2011127015A (ja) * 2009-12-18 2011-06-30 Daido Metal Co Ltd 摺動用樹脂組成物
WO2012111774A1 (fr) * 2011-02-18 2012-08-23 大豊工業株式会社 Composition de matériau coulissant et élément coulissant
WO2013039177A1 (fr) * 2011-09-13 2013-03-21 大豊工業株式会社 Élément coulissant et composition de matériau coulissant
WO2013047800A1 (fr) * 2011-09-28 2013-04-04 大豊工業株式会社 Elément de glissement et composition de matière de glissement
JP2014031871A (ja) * 2012-08-06 2014-02-20 Daido Metal Co Ltd すべり軸受

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JP7216538B2 (ja) 2023-02-01

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