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WO2013137399A1 - Élément coulissant - Google Patents

Élément coulissant Download PDF

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Publication number
WO2013137399A1
WO2013137399A1 PCT/JP2013/057218 JP2013057218W WO2013137399A1 WO 2013137399 A1 WO2013137399 A1 WO 2013137399A1 JP 2013057218 W JP2013057218 W JP 2013057218W WO 2013137399 A1 WO2013137399 A1 WO 2013137399A1
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WO
WIPO (PCT)
Prior art keywords
coating
polyethylene
sliding member
sliding
static friction
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2013/057218
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English (en)
Japanese (ja)
Inventor
昭憲 岩井
鈴木　知朗
友樹 小川
安藤　淳二
寛之 安藤
井上　博文
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JTEKT Corp
STT Inc
Original Assignee
JTEKT Corp
STT Inc
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Filing date
Publication date
Application filed by JTEKT Corp, STT Inc filed Critical JTEKT Corp
Publication of WO2013137399A1 publication Critical patent/WO2013137399A1/fr
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Ceased legal-status Critical Current

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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
    • 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
    • C10M177/00—Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
    • 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/065—Sulfides; Selenides; Tellurides
    • 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06—Metal compounds
    • C10M2201/065—Sulfides; Selenides; Tellurides
    • C10M2201/066—Molybdenum sulfide
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/022—Ethene
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
    • 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
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/1003—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds used as base material
    • 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
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/101—Condensation polymers of aldehydes or ketones and phenols, e.g. Also polyoxyalkylene ether derivatives thereof
    • C10M2209/1013—Condensation polymers of aldehydes or ketones and phenols, e.g. Also polyoxyalkylene ether derivatives thereof used as base material
    • 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
    • C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
    • C10M2213/06—Perfluoro polymers
    • C10M2213/062—Polytetrafluoroethylene [PTFE]
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/12—Groups 6 or 16
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C10N2020/02—Viscosity; Viscosity index
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/015—Dispersions of solid lubricants
    • C10N2050/02—Dispersions of solid lubricants dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10—Form in which the lubricant is applied to the material being lubricated semi-solid; greasy

Definitions

  • the present invention relates to a sliding member.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2007-177955 (Patent Document 1) describes that a diamond-like carbon (DLC) film is applied to the surface of the sliding member.
  • DLC diamond-like carbon
  • This invention is made
  • the sliding member of the present invention is a sliding member having a coating on the surface and sliding in the presence of a lubricant, wherein the coating is used as a binder, as an epoxy resin and a phenol resin, and as a solid lubricant, At least one of molybdenum disulfide and tungsten disulfide, polytetrafluoroethylene (PTFE), and polyethylene.
  • a lubricant used as a binder, as an epoxy resin and a phenol resin, and as a solid lubricant, At least one of molybdenum disulfide and tungsten disulfide, polytetrafluoroethylene (PTFE), and polyethylene.
  • the solid lubricant constituting the resin film contains disulfide, PTFE and polyethylene. Furthermore, a mixture of an epoxy resin and a phenol resin is used as a binder for the resin film. As a result, even if the number of repetitions increases, an increase in the static friction coefficient can be suppressed, and a decrease in the dynamic friction coefficient can be suppressed. That is, the state where the difference between the static friction coefficient and the dynamic friction coefficient is small can be maintained. Therefore, the occurrence of stick-slip can be continuously suppressed over a long period. In particular, wear resistance and toughness can be sufficiently exhibited by a mixture of an epoxy resin and a phenol resin as a coating binder.
  • FIG. 3 shows a schematic enlarged cross-sectional view of the male spline coating of FIG. 2.
  • the relationship between the number of repetitions in the durability test and ⁇ s / ⁇ d is shown.
  • the static friction coefficient of the sliding member according to the kind of lubricant base oil is shown.
  • the static friction coefficient of the sliding member according to a polyethylene ratio is shown.
  • the static friction coefficient of the sliding member according to the mass ratio of the solid lubricant with respect to the binder is shown.
  • the friction coefficient with respect to the sliding speed in Example 1 is shown.
  • the friction coefficient with respect to the sliding speed in a comparative example is shown.
  • the friction coefficient with respect to the sliding speed in another comparative example is shown.
  • the sliding member of this embodiment will be described by taking a sliding spline shaft as an example.
  • the sliding member of the present invention can be effectively applied to all sliding members that can generate stick-slip in addition to the sliding spline shaft.
  • the sliding spline shaft is applied to, for example, an automobile propeller shaft.
  • the sliding spline shaft includes a first shaft member 10 having a male spline 11 and a second shaft member 20 having a female spline 21.
  • the male spline 11 is spline-fitted with the female spline 21 and is slidable in the axial direction.
  • the members 10 and 20 can transmit torque to each other and can be relatively moved in the axial direction.
  • grease as a lubricant is present at the spline sliding portion.
  • the base material 16 of the male spline 11 is formed by forging, quenching, and tempering a steel material.
  • the steel material forming the male spline 11 is, for example, S30C.
  • the male spline 11 is formed by S30C, if it is steel materials or a metal material, it will not restrict to this.
  • an underlayer 17 and a film 18 are formed on the surface of the male spline 11. That is, the base layer 17 is formed on the surface of the base material 16 made of steel, and the coating film 18 that is the surface layer is formed on the surface of the base layer 17.
  • a dry film in which a resin is used as a binder and a solid lubricant is blended is applied to the film 18.
  • the cost can be reduced by applying a dry film that is a resin film instead of a DLC film.
  • the female spline 21 is formed of a steel material, for example, S30C.
  • the female spline 21 is formed of S30C, but is not limited thereto as long as it is a steel material or a metal material.
  • the coating 18 of the male spline 11 can slide on the surface of the female spline 21.
  • the base layer 17 and the coating 18 are formed on the surface of the male spline 11, and no coating is formed on the surface of the female spline 21.
  • the coating formation target may be the female spline 21. And you may form a film in both. In these cases, the coating may be formed after the base layer is formed on the surface of the female spline 21.
  • the underlayer 17 and the coating 18 will be described.
  • the formation process of the underlayer 17 and the coating film 18 will be described with reference to FIGS.
  • the surface of the base material 16 made of steel is cleaned by alkali degreasing (S1).
  • a base treatment is performed to form a base layer 17 made of a phosphate such as zinc phosphate or manganese phosphate (S2).
  • the foundation layer 17 can improve adhesion.
  • a paint for forming the surface film 18 is applied to the surface of the base layer 17 by spraying in an air atmosphere (S3).
  • This paint contains a mixture of an epoxy resin and a phenol resin as a binder, disulfide, polytetrafluoroethylene (PTFE) and polyethylene as a solid lubricant, and a solvent.
  • firing is performed in an air atmosphere (S4). Note that although firing is performed in an air atmosphere because it is inexpensive, a nitrogen atmosphere may be used.
  • the base layer 17 and the film 18 thus formed are as shown in FIG. That is, a base layer 17 made of phosphate having a thickness in the range of 1 to 5 ⁇ m is formed on the surface of the base material 16.
  • the coating 18 contains a mixture 31 of an epoxy resin and a phenol resin as a binder, and disulfide 33, PTFE 34, and polyethylene 32 as solid lubricants. These component ratios are as shown in Table 1. Note that molybdenum disulfide is used as an example as a disulfide. Of course, tungsten disulfide is also applicable as the disulfide. Moreover, you may contain an additive suitably.
  • the film 18 has a thickness in the range of 5 to 100 ⁇ m, and more preferably in the range of 10 to 40 ⁇ m from the viewpoint of adhesion and wear resistance.
  • the mass ratio of the epoxy resin as a binder and the phenol resin is 25 to 100 parts by mass of the phenol resin with respect to 100 parts by mass of the epoxy resin. This ratio can ensure wear resistance and toughness.
  • the mass ratio is 65 to 75 parts by mass of phenol resin with respect to 100 parts by mass of epoxy resin.
  • the toughness can be increased by increasing the ratio of the epoxy resin, and the wear resistance can be improved by increasing the ratio of the phenol resin.
  • the epoxy resin having a molecular weight of 20,000 to 30,000 is preferably applied.
  • the polyethylene 32 has an average particle diameter of 1 to 30 ⁇ m, and the mass ratio with respect to the entire coating 18 is 5 to 10% by mass.
  • the average particle diameter of the polyethylene 32 is appropriately selected according to the film thickness of the coating 18.
  • the disulfide 33 has an average particle diameter of 1 to 5 ⁇ m, and the mass ratio with respect to the entire coating 18 is 10 to 15 mass%.
  • PTFE 34 has an average particle diameter of 1 to 10 ⁇ m, and a mass ratio with respect to the entire coating film 18 is 10 to 15 mass%.
  • at least the ratio of polyethylene 32 is the same as or less than that of disulfide 33 and PTFE 34.
  • Solvents include methyl ethyl ketone, toluene, xylene, propylene glycol monomethyl ether acetate, isopropyl alcohol, 1-butanol, methyl isobutyl ketone, phenol, orthocresol and the like.
  • the grease as the lubricant is based on poly ⁇ olefin (PAO).
  • PAO poly ⁇ olefin
  • PAO having a kinematic viscosity at 40 ° C. of 1,000 to 10,000 mm 2 / s or higher and a kinematic viscosity at 100 ° C. of 200 to 700 mm 2 / s or higher is preferably used.
  • the durability test condition is that the second shaft member 20 is fixed and the first shaft member 10 is reciprocated in the axial direction with a twisting torque applied thereto. This is repeated until the number of reciprocating movements reaches 6n times (n is a set value).
  • the static friction force ⁇ s and the dynamic friction force ⁇ d are performed using a strain gauge attached to the female spline 21.
  • the static friction force ⁇ s and the dynamic friction force ⁇ d are measured for the state before the start of the durability test and the number of repetitions of n, 2n, 3n, 4n, 5n, and 6n.
  • Example 1 (A1) a zinc phosphate coating is formed as a base layer 17 on the surface of the base material 16 of the male spline 11 formed by forging, quenching and tempering the steel S30C as the male spline 11, This is a case where the male spline 11 having the coating film 18 having the components shown in 1 is used and the grease shown in Table 3 is used as the grease as the lubricant.
  • the thickness of the underlayer 17 varies, and the range of the thickness is 1 to 3 ⁇ m.
  • the average particle diameter of polyethylene 32 in the coating 18 is 10 ⁇ m
  • the average particle diameter of molybdenum disulfide 33 is 3 ⁇ m
  • the average particle diameter of PTFE is 5 ⁇ m.
  • the film 18 has a thickness of 10 to 20 ⁇ m.
  • PTFE having an average particle diameter of 5 ⁇ m and stearic acid wax having a melting point of 220 ⁇ 15 ° C. are used.
  • Example 2 is a male spline in which the same base layer 17 and coating film 18 as those of Example 1 are formed on the surface of the base material 16 of the male spline 11 formed by forging, quenching, and tempering the steel S30C as the male spline 11.
  • No. 11 is used, and the grease that is a lubricant is a mineral oil as a base oil, Li stearate (lithium soap) as a thickener, and a grease containing a molybdenum-based additive.
  • the film thickness of the foundation layer 17 and the coating film 18 is the same as the film thickness of the foundation layer 17 and the coating film 18 of Example 1.
  • Example 1 replacing the removed mass with a binder is used, and the grease of Example 1 is used as the grease as the lubricant. That is, grease using a base oil of poly ⁇ olefin is used.
  • the film thickness of the foundation layer 17 and the coating film 18 is the same as the film thickness of the foundation layer 17 and the coating film 18 of Example 1.
  • Test results The test results are shown in Tables 4 to 7 for Example 1, Example 2, Comparative Example, and Reference Example, respectively.
  • FIG. 5 shows ⁇ s / ⁇ d with respect to the number of repetitions.
  • A1, A2, B, and C indicate Example 1, Example 2, Comparative Example, and Reference Example, respectively.
  • the static friction force ⁇ s is always larger than the dynamic friction force ⁇ d. Therefore, the vertical axis value is always larger than 1 as shown in FIG.
  • the ⁇ -V characteristic has a positive slope
  • the ⁇ -V characteristic has a negative slope. That is, in the comparative example (B), the ⁇ -V characteristic is always a negative gradient. Therefore, stick slip can occur from the initial state.
  • the dynamic friction force ⁇ d decreases as the number of repetitions increases, the difference ( ⁇ s ⁇ d) between the static friction force ⁇ s and the dynamic friction force ⁇ d gradually increases. Therefore, stick slip is more likely to occur as the number of repetitions increases.
  • Example 1 (A1) it can be seen that the static friction force ⁇ s is significantly smaller than that in Comparative Example (B). Furthermore, in Example 1 (A1), the static friction force ⁇ s is smaller than the dynamic friction force ⁇ d. That is, the ⁇ -V characteristic has a positive slope. In particular, both in the initial state and in the case where the number of repetitions increases, both the static friction force ⁇ s and the dynamic friction force ⁇ d do not change greatly, and ⁇ s / ⁇ d is also substantially constant. Thus, even if the number of repetitions increases, a positive slope ⁇ -V characteristic can be obtained. Therefore, the occurrence of stick-slip can be reliably suppressed over a long period of time.
  • Example 2 (A2) has a static friction force ⁇ s that is not so different from that of Comparative Example (B).
  • the dynamic friction force ⁇ d in the comparative example (B) decreases as the number of repetitions increases, whereas the dynamic friction force ⁇ d in Example 2 (A2) does not change so much even if the number of repetitions increases. Therefore, in Example 2 (A2), both the static frictional force ⁇ s and the dynamic frictional force ⁇ d are not significantly changed in both the initial state and the state where the number of repetitions is increased, and ⁇ s / ⁇ d is substantially constant.
  • the ⁇ -V characteristics hardly change, and stick-slip generation can be suppressed for a long period of time.
  • the static friction force ⁇ s immediately after the start of the test is smaller than that in the comparative example (B).
  • the state in which the dynamic friction force ⁇ d is larger than the static friction force ⁇ s is maintained both in the initial state and in the state where the number of repetitions is increased. That is, it has a positive slope ⁇ -V characteristic. Therefore, in Reference Example (C), the occurrence of stick slip can be suppressed over a long period of time. However, as the number of repetitions increases, both the static friction force ⁇ s and the dynamic friction force ⁇ d change.
  • Example 1 (A1) is compared with Reference Example (C).
  • the absolute value of the difference ⁇ s ⁇ d between the static frictional force ⁇ s and the dynamic frictional force ⁇ d is larger than that in the reference example (C). That is, in Example 1 (A1), the static friction force ⁇ s is surely smaller than the dynamic friction force ⁇ d.
  • positive ⁇ -V characteristics can be obtained with certainty.
  • Example 1 (A1) even when the number of repetitions increases, the frictional forces ⁇ s and ⁇ d are both kept small, but in Reference Example (C), the frictional force ⁇ s increases as the number of repetitions increases. , ⁇ d are both increased.
  • the frictional forces ⁇ s and ⁇ d are smaller, the occurrence of stick-slip is suppressed. That is, according to Example 1 (A1), since the frictional forces ⁇ s and ⁇ d can be reduced as compared with the reference example (C), the occurrence of stick slip can be suppressed.
  • Example 1 (A1) is in an optimal state. That is, the base layer 17 and the coating film 18 are formed as in Example 2 (A2), but when grease using mineral oil as a base oil is used, or the base layer 17 and polyethylene are used as in Reference Example (C). Compared to the case of using the grease with PAO as the base oil by forming the removed film 18, the base layer 17 and the film 18 containing polyethylene are formed and the grease with the base oil as PAO is used. Become effective.
  • the polyethylene 32 used as the solid lubricant for the coating 18 has long molecular chains entangled in the particles.
  • the molecular structure of polyethylene 32 of the coating 18 is similar to the molecular structure of PAO used as a base oil for grease. Therefore, it is considered that PAO becomes familiar with the polyethylene 32 in the coating 18 and the PAO is infiltrated into the polyethylene 32 particles.
  • a coating film having the components shown in Table 1 was formed on a steel plate made of SPCC-SB and having a size of 35 ⁇ 70 ⁇ 0.3 mm without forming an underlayer, and used as a test piece.
  • the film thickness varies, and the film thickness is in the range of 15 to 25 ⁇ m.
  • the coating was formed by applying a coating for forming a coating on a steel plate and holding at a firing temperature of 180 ° C. for 30 minutes.
  • Lubricant base oil was apply
  • the test piece is fixed to a moving table of a surface property measuring instrument (HEIDON-14DR, (registered trademark) Shinto Kagaku Co., Ltd.), and a 10 mm diameter JIS SUJ2 non-rotatable steel ball is fixed on the test piece. Placed on top. A weight was placed above the vertical direction of the steel ball, and the load applied to the test piece by the steel ball was 9.8N. The ball is connected to a load cell fixed to the surface property measuring machine via an arm extending in a first horizontal direction perpendicular to the vertical direction.
  • HEIDON-14DR (registered trademark) Shinto Kagaku Co., Ltd.
  • the moving table was reciprocated by a distance of 10 mm in the first linear direction which is the horizontal direction, and the torque was detected by the load cell.
  • the moving platform is accelerated in the positive direction of the first linear direction from 0 mm / min to 2,000 mm / min at a constant acceleration, and immediately decelerated to 0 mm / min at a constant acceleration equal to the constant acceleration.
  • Immediately, in the negative direction of the first linear direction it accelerates to -2,000mm / min with a constant acceleration, then immediately decelerates to 0mm / min with a constant acceleration equal to the constant acceleration, and slides this one time. Repeated 1,000 times.
  • the static friction coefficient is the starting torque when the test piece starts to slide with respect to the steel ball when the moving table is accelerated in the positive direction of the first linear direction from 0 mm / min. Is obtained from the load applied to the test piece.
  • the lubricant base oil is fluorinated oil (130mm 2 / s @ 40 ° C), silicone oil (100mm 2 / s @ 40 ° C), poly ⁇ olefin (30mm 2 / s @ 40 ° C), ester Oil (100 mm 2 / s @ 40 ° C.) and mineral oil (40 mm 2 / s @ 40 ° C.) were used.
  • the measurement result of the static friction coefficient of the sliding member with respect to the number of sliding times is shown in FIG.
  • FIG. 6 in the case of silicone oil, it has been found that in the case of fluorine oil, the static friction coefficient is 0.2 or higher immediately after the start of measurement, and the static friction coefficient further increases when the number of sliding times exceeds 300. Is good with a coefficient of static friction of about 0.1 immediately after the start of measurement. Silicone oil has a low surface tension, so it easily penetrates into the film. However, -Si-O- bonds contained in silicone oil are fragile due to sliding, and the static friction coefficient increases rapidly when the number of sliding exceeds 500.
  • the coefficient of static friction is a high value of about 0.18 to 0.20 immediately after the start of measurement.
  • the coefficient of static friction is stable from 0.1 to 13 to 0.14 immediately after the start of measurement.
  • polyalphaolefin it can be seen that the coefficient of static friction is stable at 0.08 to 0.11 immediately after the start of measurement, which is preferable. It is considered that the above results were obtained because the poly ⁇ -olefin and the polyethylene in the film are similar in molecular structure and are easy to adjust.
  • Each coating 18 has a constant mass ratio of binder to solid lubricant of 2: 1, a constant mass ratio of epoxy resin to phenolic resin of 6: 4, and is composed of molybdenum disulfide and polytetrafluoroethylene (PTFE).
  • PTFE polytetrafluoroethylene
  • the mass ratio of polyethylene when the mass ratio of molybdenum disulfide and PTFE to polyethylene (hereinafter referred to as “the mass ratio of polyethylene”) is set to 70:30, even in the initial state and when the number of sliding times increases, Smallest coefficient of static friction. In other words, when the mass ratio of polyethylene in the coating 18 is less than the above ratio, it is considered that the effect of polyethylene cannot be sufficiently exhibited. On the other hand, if the mass ratio of polyethylene in the coating 18 is larger than the above ratio, it is considered that the polyethylene absorbs grease excessively, thereby reducing the grease and consequently increasing the coefficient of static friction.
  • the mass ratio (P / B ratio) of the solid lubricant (P) to the binder (B) was changed to 0.6, 0.5, and 0.4.
  • the mass ratio of the epoxy resin and the phenol resin was constant at 6: 4
  • the mass ratio of molybdenum disulfide, PTFE, and polyethylene was constant at 3.8: 3.8: 2.5.
  • F1, F2, and F3 indicate cases where the P / B ratios are 0.6, 0.5, and 0.4, respectively. That is, when the P / B ratio is set to 0.5, the static friction coefficient is substantially constant even when the number of sliding operations is increased. On the other hand, when the P / B ratio is 0.6 or 0.4, the static friction coefficient is changed when the number of sliding is increased. Thus, when the P / B ratio is 0.5, the static friction coefficient is stable over a long period of time. That is, it can be seen that the P / B ratio should be 0.43 to 0.58.
  • Example 1 As a coating of S30C, a coating containing a solid lubricant containing polyethylene was formed on a resin binder, and grease using PAO as a base oil was used as the lubricant.
  • the test body F2 does not form a film, but uses a grease containing mineral oil as a base oil and containing a molybdenum-based additive.
  • the specimen F3 uses a grease that forms diamond-like carbon (DLC) as a coating of S30C, uses mineral oil as a base oil, and does not contain a molybdenum-based additive.
  • DLC diamond-like carbon
  • each of the above specimens was used as a block, a load of 50 N was applied to the ring using S30C, and the sliding speed was 0.009 m / s, 0.018 m / s, 0.037 m / s, 0.073 m /
  • the coefficient of friction was measured in a state where the velocity was changed to s, 0.147 m / s, 0.073 m / s, 0.037 m / s, 0.018 m / s, and 0.009 m / s and held at each speed for a certain period of time.
  • FIG. 9 shows the measurement result of the test specimen F1
  • FIG. 10 shows the measurement result of the test specimen F2
  • FIG. 11 shows the measurement result of the test specimen F3.
  • 9 to 11 there are shown a case where the sliding speed is increased and a case where the sliding speed is decreased, respectively.
  • FIG. 9 shows that the specimen F1 corresponding to Example 1 has a larger friction coefficient as the sliding speed increases and a smaller friction coefficient as the sliding speed decreases. That is, it can be seen that the ⁇ -V characteristic has a positive slope.
  • the friction coefficient decreases as the sliding speed increases, and the friction coefficient increases as the sliding speed decreases. That is, it can be seen that the ⁇ -V characteristic has a negative slope.
  • the specimen F1 has a smaller coefficient of friction when the sliding speed is smaller than the other specimens F2 and F3.
  • the mass ratio of the epoxy resin and the phenol resin is 25 to 100 parts by mass of the phenol resin with respect to 100 parts by mass of the epoxy resin, and the mass ratio of the polyethylene 32 with respect to the entire coating 18 is 5 to 10% by mass.
  • the lubricant includes poly alpha olefin (PAO) as the base oil.
  • PAO poly alpha olefin
  • the polyethylene 32 used as the solid lubricant for the coating 18 has long molecular chains entangled in the particles.
  • the molecular structure of polyethylene 32 of the coating 18 is similar to the molecular structure of PAO used as the base oil for the lubricant. Therefore, it is considered that PAO becomes familiar with the polyethylene 32 in the coating 18 and the PAO is infiltrated into the polyethylene 32 particles.
  • the base oil has a 40 ° C. kinematic viscosity of 1,000 mm 2 / s or more.
  • PAO that has soaked in the polyethylene 32 particles in the coating 18 forms a strong oil film, and the oil film is less likely to break. As a result, it is easy to maintain the lubricant holding state by the coating 18. Thereby, the said effect can be exhibited more effectively.
  • the sliding member is a spline shaft that slides in the axial direction.
  • the present invention to the spline shaft that slides in the axial direction, it is possible to suppress the occurrence of stick-slip when sliding in the axial direction.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)

Abstract

La présente invention se rapporte à un élément coulissant qui peut à un faible coût réduire l'apparition d'un glissement saccadé. Un film de revêtement sur la surface de l'élément coulissant contient les éléments suivants ; une résine époxy et une résine phénolique en tant que liant, au moins un disulfure de disulfure de molybdène et un disulfure de tungstène en tant que lubrifiant solide polytétrafluoroéthylène ( PTFE ) et du polyéthylène.
PCT/JP2013/057218 2012-03-14 2013-03-14 Élément coulissant Ceased WO2013137399A1 (fr)

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US10294441B2 (en) 2014-03-04 2019-05-21 Dow Corning Toray Co., Ltd. Coating composition for lubricating coating film
CN111356753A (zh) * 2017-11-14 2020-06-30 株式会社丰田自动织机 滑动构件及其制造方法
EP3858957A1 (fr) * 2020-02-03 2021-08-04 Klüber Lubrication München SE & Co. KG Système tribologique

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JP3216733B2 (ja) 1992-07-09 2001-10-09 アイダエンジニアリング株式会社 外壁の一部を肉厚に成形する段付カップ状部品の鍛造加工装置
US10370514B2 (en) * 2014-06-23 2019-08-06 Southwire Company, Llc UV-resistant superhydrophobic coating compositions
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MX2020012415A (es) 2018-05-23 2021-04-28 Nissan Motor Dispositivo de eje estriado deslizante.
JP2019210957A (ja) * 2018-05-31 2019-12-12 トヨタ自動車株式会社 スプライン構造
WO2023002853A1 (fr) * 2021-07-21 2023-01-26 株式会社日本触媒 Résine acrylique pour encre

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US10294441B2 (en) 2014-03-04 2019-05-21 Dow Corning Toray Co., Ltd. Coating composition for lubricating coating film
CN111356753A (zh) * 2017-11-14 2020-06-30 株式会社丰田自动织机 滑动构件及其制造方法
CN111356753B (zh) * 2017-11-14 2022-05-17 株式会社丰田自动织机 滑动构件及其制造方法
EP3858957A1 (fr) * 2020-02-03 2021-08-04 Klüber Lubrication München SE & Co. KG Système tribologique

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