WO2018011958A1 - Gear and gear production method - Google Patents
Gear and gear production method Download PDFInfo
- Publication number
- WO2018011958A1 WO2018011958A1 PCT/JP2016/070911 JP2016070911W WO2018011958A1 WO 2018011958 A1 WO2018011958 A1 WO 2018011958A1 JP 2016070911 W JP2016070911 W JP 2016070911W WO 2018011958 A1 WO2018011958 A1 WO 2018011958A1
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- WO
- WIPO (PCT)
- Prior art keywords
- gear
- mass
- tooth
- teeth
- thickness
- Prior art date
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Classifications
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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
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/04—After-treatment of articles without altering their shape; Apparatus therefor by wave energy or particle radiation, e.g. for curing or vulcanising preformed articles
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
Definitions
- the present invention relates to a gear and a manufacturing method of the gear.
- Polyamide 66 is widely used for sliding members in the industrial machinery field because of its excellent mechanical properties, friction and wear resistance, chemical resistance, and the like.
- gears, cams, washers, bearings, and the like obtained by molding polyamide 66 are widely used for automobile parts, machine parts, electrical and electronic parts, and the like.
- a resin composition containing polyamide 66 and a sliding agent has been proposed as a resin composition used for molding a molded body (for example, Japanese Patent Laid-Open No. 5-93129, Japanese Patent Laid-Open No. 5-93129) 2013-64420).
- a gear obtained from a conventional resin composition containing polyamide 66 and a sliding agent has a relatively small dynamic friction coefficient.
- it is necessary to prevent the gear during sliding from becoming high temperature. It becomes a high temperature of 80 ° C. or higher, and it cannot be said that the physical deterioration during sliding is not sufficiently suppressed.
- the present invention has been made on the basis of the circumstances as described above, and includes a polyamide 66, and a gear excellent in an effect of suppressing physical deterioration during sliding by suppressing a temperature rise during sliding, and such a gear. It aims at providing the manufacturing method of.
- a gear according to one embodiment of the present invention made to solve the above-described problem is a gear formed by crosslinking a resin composition containing polyamide 66 and a crosslinking aid, and represented by the following formula (1):
- the specified mass reduction rate is 0.5% or less.
- Mass reduction rate [%] (XY) / X ⁇ 100 (1)
- X initial gear mass [g]
- Y Mass of gear after fatigue test in which gears are rotated for 100 hours under conditions of tooth surface load 4.5 N / mm and rotation speed 616 rpm [g]
- a gear according to another embodiment of the present invention made to solve the above-described problem is a gear formed by crosslinking a resin composition containing polyamide 66 and a crosslinking aid, and is represented by the following formula (1). ) Is a mass reduction rate specified by 0.5) or less.
- Mass reduction rate [%] (XY) / X ⁇ 100 (1)
- X initial mass [g] of spur gear A having a tooth width of 5 mm, module 1, number of teeth of 30, and a thickness of 10.7 mm of contiguous teeth of 10.7 mm formed under the same conditions as the gear Y: The spur gear B and spur gear A having a tooth width of 5 mm, module 1, number of teeth 31 and a continuous tooth thickness of 10.7 mm, which are formed under the same conditions as the gear, mesh with each other, and the tooth load 4 Mass of the spur gear A after a fatigue test in which the gears are rotated for 100 hours under conditions of 5 N / mm and a rotation speed of 616 rpm [g]
- a gear according to another embodiment of the present invention which has been made to solve the above problems, is a gear formed by crosslinking a resin composition containing polyamide 66 and a crosslinking aid, and has the following formula (The reduction rate of the tooth thickness defined in 2) is 0.3% or less.
- a gear manufacturing method made to solve the above-described problems is obtained by an injection molding step of injection molding a resin composition containing polyamide 66 and a crosslinking aid, and the injection molding step.
- a method of manufacturing a gear including an ionizing radiation irradiation step of irradiating the molded body with ionizing radiation, wherein the mass reduction rate defined by the following formula (1) of the obtained gear is 0.5% or less.
- Mass reduction rate [%] (XY) / X ⁇ 100 (1)
- Y Mass of gear after fatigue test in which gears are rotated for 100 hours under conditions of tooth surface load 4.5 N / mm and rotation speed 616 rpm [g]
- Another aspect of the present invention which is a gear manufacturing method for solving the above-described problems, is an injection molding step of injection molding a resin composition containing polyamide 66 and a crosslinking aid, and the injection molding step.
- Mass reduction rate [%] (XY) / X ⁇ 100 (1)
- X Initial mass [g] of spur gear A having a tooth width of 5 mm, module 1, number of teeth 30 and a continuous tooth thickness of 10.7 mm formed under the same conditions as the obtained gear
- Y meshing spur gear B and spur gear A having a tooth width of 5 mm, module 1, number of teeth of 31 and a thickness of 10.7 mm, which is a continuous gear tooth, formed under the same conditions as the obtained gear, and tooth load Mass [g] of spur gear A after a fatigue test in which gears are rotated for 100 hours under conditions of 4.5 N / mm and a rotational speed of 616 rpm
- Another aspect of the gear manufacturing method according to the present invention made to solve the above problems is an injection molding step of injection molding a resin composition containing polyamide 66 and a crosslinking aid, and the injection molding step.
- a method of manufacturing a gear including an ionizing radiation irradiation step of irradiating an ionizing radiation to the molded body obtained in the step, wherein the reduction rate of the tooth thickness defined by the following formula (2) of the gear is 0.3. % Or less.
- the gear of the present invention contains polyamide 66 and is excellent in the effect of suppressing physical deterioration during sliding by suppressing the temperature rise during sliding.
- the gear manufacturing method of the present invention includes polyamide 66, and can easily manufacture a gear excellent in the effect of suppressing physical deterioration during sliding by suppressing temperature rise during sliding.
- a gear according to one embodiment of the present invention is a gear formed by crosslinking a resin composition containing polyamide 66 and a crosslinking aid, and has a mass reduction rate of 0.00 specified by the following formula (1). 5% or less.
- Mass reduction rate [%] (XY) / X ⁇ 100 (1)
- X initial gear mass [g]
- Y Mass of gear after fatigue test in which gears are rotated for 100 hours under conditions of tooth surface load 4.5 N / mm and rotation speed 616 rpm [g]
- a gear according to another aspect of the present invention is a gear formed by crosslinking a resin composition containing polyamide 66 and a crosslinking aid, and has a mass reduction rate of 0 defined by the following formula (1). .5% or less.
- Mass reduction rate [%] (XY) / X ⁇ 100 (1)
- X initial mass [g] of spur gear A having a tooth width of 5 mm, module 1, number of teeth of 30, and a thickness of 10.7 mm of contiguous teeth of 10.7 mm formed under the same conditions as the gear
- Y The spur gear B and spur gear A having a tooth width of 5 mm, module 1, number of teeth 31 and a continuous tooth thickness of 10.7 mm, which are formed under the same conditions as the gear, mesh with each other, and the tooth load 4 Mass of the spur gear A after a fatigue test in which the gears are rotated for 100 hours under conditions of 5 N / mm and a rotation speed of 616 rpm [g]
- the gear is excellent in the effect of suppressing physical deterioration during sliding because the mass reduction rate defined by the formula (1) is not more than a specific value. This is because when the mass reduction rate defined by the expression (1) is a specific value or less, the gear is difficult to deform, and a good meshing state is maintained in the sliding gear. It is estimated that the temperature rise is suppressed.
- a gear according to still another aspect of the present invention is a gear formed by cross-linking a resin composition containing polyamide 66 and a cross-linking aid, and having a thickness of a toothpick defined by the following formula (2).
- the reduction rate is 0.3% or less.
- the gear is excellent in the effect of suppressing physical deterioration during sliding because the reduction rate of the tooth thickness defined by the formula (2) is not more than a specific value. This is because if the toothpick thickness reduction rate defined by the formula (2) is below a specific value, the gear is difficult to deform and the sliding gear maintains a good meshing state. It is estimated that the temperature rise inside is suppressed.
- the thickness of the straddle teeth defined by the equation (2) is evaluated by the amount of gear tooth reduction, as well as the mass reduction rate defined by the equation (1). Therefore, it can be considered that making the thickness of the toothpick below a certain value is synonymous with making the mass reduction rate defined by the equation (1) below a certain value.
- the dynamic viscoelasticity at 260 ° C. is preferably 1 MPa or more.
- the “dynamic viscoelastic modulus” is a value measured according to JIS-K-7244-1 (1998).
- the cross-linking aid preferably contains triallyl isocyanurate.
- triallyl isocyanurate as a crosslinking aid in this way, the crosslinking density of the gear can be further increased, so that the effect of suppressing physical deterioration during sliding can be further promoted.
- the content of the crosslinking aid is preferably 1 part by mass or more and 10 parts by mass or less with respect to 100 parts by mass of polyamide 66.
- the gear manufacturing method includes an injection molding step of injection-molding a resin composition containing polyamide 66 and a crosslinking aid, and irradiating ionized radiation to a molded body obtained in the injection molding step.
- regulated by following formula (1) of the gear which is provided with the ionizing radiation irradiation process to perform, Comprising: 0.5% or less is obtained.
- Mass reduction rate [%] (XY) / X ⁇ 100 (1)
- Y Mass of gear after fatigue test in which gears are rotated for 100 hours under conditions of tooth surface load 4.5 N / mm and rotation speed 616 rpm [g]
- a gear manufacturing method includes an injection molding step of injection molding a resin composition containing polyamide 66 and a crosslinking aid, and ionizing radiation on a molded body obtained by the injection molding step.
- a method of manufacturing a gear including an ionizing radiation irradiation step of irradiating, wherein a mass reduction rate defined by the following formula (1) of the obtained gear is 0.5% or less.
- Mass reduction rate [%] (XY) / X ⁇ 100 (1)
- X Initial mass [g] of spur gear A having a tooth width of 5 mm, module 1, number of teeth 30 and a continuous tooth thickness of 10.7 mm formed under the same conditions as the obtained gear
- Y meshing spur gear B and spur gear A having a tooth width of 5 mm, module 1, number of teeth of 31 and a thickness of 10.7 mm, which is a continuous gear tooth, formed under the same conditions as the obtained gear, and tooth load Mass [g] of spur gear A after a fatigue test in which gears are rotated for 100 hours under conditions of 4.5 N / mm and a rotational speed of 616 rpm
- the gear manufacturing method can manufacture a gear having a mass reduction rate of 0.5% or less as defined by the formula (1), it is possible to suppress physical deterioration during sliding by suppressing temperature rise during sliding.
- the gear which is excellent in can be obtained easily.
- the gear manufacturing method includes an injection molding step of injection-molding a resin composition containing polyamide 66 and a crosslinking aid, and ionizing radiation to a molded body obtained in the injection molding step.
- the gear manufacturing method can manufacture a gear having a thickness reduction rate of 0.3% or less as defined by Equation (2), physical deterioration during sliding can be achieved by suppressing temperature rise during sliding. A gear excellent in the suppression effect can be easily obtained.
- the gear according to the first embodiment is formed by crosslinking a resin composition containing polyamide 66 and a crosslinking aid, and the mass reduction rate defined by the following formula (1) is 0.5% or less.
- Mass reduction rate [%] (XY) / X ⁇ 100 (1)
- X initial gear mass [g]
- Y Mass of gear after fatigue test in which gears are rotated for 100 hours under conditions of tooth surface load 4.5 N / mm and rotation speed 616 rpm [g]
- the gear Since the gear has a mass reduction rate defined by the equation (1) that is not more than a specific value, it is excellent in the effect of suppressing physical deterioration during sliding due to suppression of temperature rise during sliding.
- the gear is formed by crosslinking a polyamide 66 and a resin composition containing the crosslinking aid.
- the resin composition contains polyamide 66 and a crosslinking aid.
- the resin composition preferably contains polyamide 66 as a main component.
- the resin composition can improve the mechanical characteristics, friction wear resistance, chemical resistance, and the like of the gear.
- the “main component” means a component that is contained most, for example, a component that is contained by 50% by mass or more.
- the content of polyamide 66 in the resin composition is preferably 70% by mass or more, and more preferably 80% by mass or more.
- the resin composition may contain a resin other than polyamide 66 (other resins).
- other resins include polyamides other than polyamide 66 and resins other than polyamide.
- other resin can be used individually or in combination of 2 or more types.
- polyamides other than polyamide 66 include polyamide 6, polyamide 46, polyamide 11, polyamide 12, polyamide 610, polyamide 612, polyamide 66 / 6I, polyamide 66 / 6T, polyamide 6T / 66, polyamide 6T / 6I, polyamide 6T / 6I / 66, polyamide 6T-5MT, polyamide 6T / 6, polyamide MXD-6, polyamide 9T, wholly aromatic polyamide, and the like.
- the resin other than the polyamide examples include polyolefin, polyurethane, acrylic resin, methacrylic resin, polyester, epoxy resin, fluororesin, natural or synthetic rubber, silicone resin, ABS (styrene-acrylonitrile-butadiene copolymer) resin, and polycarbonate. , Polylactic acid, polyacetal and the like.
- the upper limit of the proportion of the other resin in the total resin components of the resin composition is preferably 20% by mass, and 10% by mass. Is more preferable, and 5 mass% is further more preferable.
- the resin composition preferably contains only polyamide 66 as a resin component.
- the resin composition contains a crosslinking aid.
- the said resin composition can raise the bridge
- crosslinking aid examples include oxime compounds, acrylate or methacrylate compounds, vinyl compounds, allyl compounds, maleimide compounds, and the like.
- a crosslinking adjuvant can be used individually or in combination of 2 or more types.
- oxime compound examples include p-quinone dioxime, p, p'-dibenzoylquinone dioxime, and the like.
- Examples of the acrylate or methacrylate compound include diethylene glycol diacrylate, diethylene glycol dimethacrylate, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, and acrylic acid / zinc oxide.
- a mixture, allyl acrylate, allyl methacrylate, trimethacryl isocyanurate, etc. are mentioned.
- vinyl compound examples include divinylbenzene, vinyltoluene, and vinylpyridine.
- allyl compound examples include hexamethylene diallyl nadiimide, diallyl itaconate, diallyl phthalate, diallyl isophthalate, diallyl monoglycidyl isocyanurate, triallyl cyanurate, triallyl isocyanurate and the like.
- maleimide compound examples include N, N′-m-phenylenebismaleimide, N, N ′-(4,4′-methylenediphenylene) dimaleimide, and the like.
- crosslinking aid an allyl compound is preferable and triallyl isocyanurate is more preferable because the crosslinking density of the gear can be increased.
- the lower limit of the content of the crosslinking aid in the resin composition is preferably 1 part by weight, more preferably 1.5 parts by weight, and even more preferably 2 parts by weight with respect to 100 parts by weight of polyamide 66.
- the upper limit of the content is preferably 10 parts by mass, more preferably 9 parts by mass, and still more preferably 8 parts by mass with respect to 100 parts by mass of the polyamide.
- the resin composition preferably contains a sliding agent.
- the dynamic friction coefficient of the gear can be reduced, so that the effect of suppressing physical deterioration during sliding can be further increased.
- sliding agent examples include polyethylene such as ultra high molecular weight polyethylene, and polyolefin such as polypropylene; Fluororesin such as polytetrafluoroethylene, polytetrafluoroethylene / perfluoroalkoxyethylene copolymer, polytetrafluoroethylene / polyhexafluoropropylene; Silicones such as polydimethylsiloxane, polymethylphenylsiloxane, amino-modified polydimethylsiloxane, epoxy-modified polydimethylsiloxane, alcohol-modified polydimethylsiloxane, carboxy-modified polydimethylsiloxane, fluorine-modified polydimethylsiloxane; Layered inorganic compounds such as graphite; Inorganic fibers such as glass fiber, potassium titanate whisker, zinc oxide whisker, boronic acid whisker; Organic fibers such as LCP fiber, aramid fiber, carbon fiber; Inorganic particles such as such as
- polyolefin is preferable and polyethylene is more preferable because the wear resistance of the gear can be further improved.
- the lower limit of the content of the sliding agent in the resin composition is preferably 1 part by weight, more preferably 1.5 parts by weight, and even more preferably 2 parts by weight with respect to 100 parts by weight of polyamide 66.
- the upper limit of the content is preferably 10 parts by mass, more preferably 9.5 parts by mass, and still more preferably 9 parts by mass with respect to 100 parts by mass of the polyamide.
- the resin composition may contain an additive as necessary.
- the additive include a polymerization inhibitor, a filler (excluding the sliding agent), a plasticizer, a pigment, a stabilizer, a lubricant, a softening agent, a sensitizer, an antioxidant, a flame retardant, Examples include release agents, weathering agents, antistatic agents, and silane coupling agents.
- an additive can be used individually or in combination of 2 or more types.
- the resin composition can be obtained by mixing each constituent component. Specifically, the resin composition can be obtained, for example, by mixing polyamide 66 and the crosslinking aid. In the mixing, a mixer such as a single screw mixer or a twin screw mixer can be used. Moreover, you may heat in the case of mixing.
- the upper limit of the mass reduction rate (first mass reduction rate) defined by the following formula (1) of the gear is 0.5%, more preferably 0.3%, and even more preferably 0.1%. .
- the mass reduction rate is equal to or less than the upper limit, the effect of suppressing physical deterioration during sliding can be promoted. This is because when the mass reduction rate defined by the expression (1) is a specific value or less, the gear is difficult to deform, and a good meshing state is maintained in the sliding gear. It is estimated that the temperature rise is suppressed.
- Mass reduction rate [%] (XY) / X ⁇ 100 (1)
- X initial gear mass [g]
- Y Mass of gear after fatigue test in which gears are rotated for 100 hours under conditions of tooth surface load 4.5 N / mm and rotation speed 616 rpm [g]
- the upper limit of the mass reduction rate (second mass reduction rate) defined by the above formula (1) when the gear is a spur gear A having a fixed shape is preferably 0.5%, 0.3 % Is more preferable, and 0.1% is more preferable.
- X and Y are as follows in the above formula (1). Note that “the gear is changed to the spur gear A” means that the spur gear A is formed under the same conditions as the gear formation method. “Forming under the same conditions as the gear” means that the same resin composition as the resin composition used for forming the gear is used, and the spur gear A and the spur gear are manufactured in the same process (manufacturing method) as the gear. This means that B is formed.
- spur gear A initial mass [g] of spur gear A having a tooth width of 5 mm, module 1, number of teeth of 30, and a thickness of 10.7 mm of contiguous teeth of 10.7 mm formed under the same conditions as the gear Y: The spur gear B and spur gear A having a tooth width of 5 mm, module 1, number of teeth 31 and a continuous tooth thickness of 10.7 mm, which are formed under the same conditions as the gear, mesh with each other, and the tooth load 4 Mass of the spur gear A after a fatigue test in which the gears are rotated for 100 hours under conditions of 5 N / mm and a rotation speed of 616 rpm [g]
- the upper limit of the toothpick thickness reduction rate defined by the following formula (2) of the gear is preferably 0.3%, more preferably 0.2%, and 0 More preferably, 1%. If the reduction rate of the toothpick thickness is less than or equal to the above upper limit, the strength, durability, heat resistance, etc. of the gear can be increased and the effect of suppressing physical deterioration during sliding can be promoted.
- the straddle tooth thickness is a value measured according to JIS-B-0102-1 (2013).
- the upper limit of the maximum temperature during the following sliding test of the gear is preferably 75 ° C, more preferably 70 ° C, and further preferably 50 ° C. When the maximum temperature is not more than the upper limit, the effect of suppressing physical deterioration during sliding can be promoted.
- the above sliding test is performed under the same conditions as the gear, with a tooth width of 5 mm, module 1, number of teeth 30, spur gear A having a continuous tooth thickness of 10.7 mm and a tooth width of 5 mm, module 1, tooth A spur gear B having a thickness of 10.7 mm consisting of eight continuous teeth is manufactured, and the spur gear A and the spur gear B are meshed with each other, and the tooth surface load is 4.5 N / mm in a 25 ° C. atmosphere. This is performed by rotating the gears for 100 hours under the condition of a rotation speed of 616 rpm.
- the lower limit of the dynamic viscoelastic modulus at 260 ° C. of the gear is preferably 1 MPa, more preferably 1.5 MPa, and further preferably 2 MPa. If the dynamic viscoelastic modulus is less than the lower limit, the gear cannot obtain a sufficient crosslinking density, and there is a possibility that the effect of suppressing physical deterioration during sliding cannot be obtained sufficiently.
- gears examples include a spur gear, a cylindrical gear, a helical gear, a helical gear, a bevel gear, a crown gear, a screw gear, a worm gear, and the like.
- the tooth width of the gear is, for example, 1 mm or more and 20 mm or less.
- the gear module is, for example, 0.3 or more and 1.5 or less.
- the number of teeth of the gear is, for example, 5 or more and 100 or less, and the thickness of the contiguous eight teeth is 1 mm or more and 20 mm or less.
- the gear according to the second embodiment is formed by crosslinking a resin composition containing polyamide 66 and a crosslinking aid, and the mass reduction rate defined by the following formula (1) is 0.5% or less.
- Mass reduction rate [%] (XY) / X ⁇ 100 (1)
- X initial mass [g] of spur gear A having a tooth width of 5 mm, module 1, number of teeth of 30, and a thickness of 10.7 mm of contiguous teeth of 10.7 mm formed under the same conditions as the gear
- Y The spur gear B and spur gear A having a tooth width of 5 mm, module 1, number of teeth 31 and a continuous tooth thickness of 10.7 mm, which are formed under the same conditions as the gear, mesh with each other, and the tooth load 4 Mass of the spur gear A after a fatigue test in which the gears are rotated for 100 hours under conditions of 5 N / mm and a rotation speed of 616 rpm [g]
- the upper limit of the mass reduction rate defined by the above formula (1) is preferably 0.3%, more preferably 0.1%.
- the mass reduction rate defined by the formula (1) is not more than a specific value, so that the physical deterioration during sliding is suppressed by suppressing the temperature rise during sliding. Excellent effect.
- the gear material, properties (decrease ratio of the tooth thickness, maximum temperature during sliding and dynamic viscoelasticity), shape, manufacturing method, and the like can be the same as those in the first embodiment.
- the gear of the third embodiment is formed by cross-linking a resin composition containing polyamide 66 and a cross-linking aid, and the reduction rate of the tooth thickness defined by the following formula (2) is 0.3% or less. It is.
- the upper limit of the reduction ratio of the toothpick thickness defined by the above formula (2) is preferably 0.2%, and more preferably 0.1%.
- the gear has an excellent effect of suppressing physical deterioration during sliding due to the suppression of the temperature rise during sliding because the reduction rate of the thickness of the toothpick defined by the formula (2) is not more than a specific value.
- the gear material, properties (mass reduction rate, maximum temperature during sliding and dynamic viscoelasticity), shape, manufacturing method, and the like can be the same as in the first embodiment.
- the gear manufacturing method according to the first embodiment, the second embodiment, and the third embodiment includes an injection molding step of injection molding the resin composition containing polyamide 66 and the crosslinking aid, and the injection molding step. And an ionizing radiation irradiating step for irradiating the molded body obtained in the above with ionizing radiation. According to the gear manufacturing method, the gear can be easily obtained.
- injection molding process In the injection molding step, the resin composition is injection molded to obtain a molded body having a desired gear shape.
- the temperature of the above-mentioned resin composition of an injection molding process 150 ° C is preferred and 200 ° C is more preferred.
- the upper limit of the temperature is preferably 320 ° C, more preferably 300 ° C.
- the lower limit of the injection pressure of the injection molding process preferably 70kg / cm 2, 80kg / cm 2 is more preferable.
- the upper limit of the injection pressure preferably 130kg / cm 2, 120kg / cm 2 is more preferable.
- the lower limit of the mold temperature in the injection molding process is preferably 40 ° C, more preferably 50 ° C.
- the upper limit of the mold temperature is preferably 120 ° C, more preferably 100 ° C.
- the molded body obtained in the injection molding step is irradiated with ionizing radiation to crosslink the molded body.
- the ionizing radiation examples include ⁇ rays, ⁇ rays, ⁇ rays, electron rays, and X rays.
- the ionizing radiation is preferably an electron beam from the viewpoints of ease of control and safety.
- the irradiation amount of the ionizing radiation is not particularly limited, but is preferably 1 kGy or more and 1000 kGy or less from the viewpoint of suppressing deterioration of the resin due to irradiation while obtaining a sufficient crosslinking density.
- the lower limit of the irradiation amount is preferably 5 kGy, more preferably 10 kGy.
- the upper limit of the irradiation dose is preferably 960 kGy, more preferably 480 kGy.
- the irradiation with the ionizing radiation can be performed at room temperature.
- the ionizing radiation is preferably irradiated in a low oxygen or oxygen-free atmosphere.
- the resin composition may be molded into a desired shape using a molding method other than the injection molding method such as an extrusion molding method, a press molding method, a blow molding method, or a vacuum molding method. Good.
- the resin composition may be crosslinked by a chemical crosslinking method.
- the gear may incorporate a metal part such as a shaft.
- the method for manufacturing the gear may include steps other than the step of injection molding the resin composition and the step of irradiating the molded body with ionizing radiation.
- steps other than the step of injection molding the resin composition and the step of irradiating the molded body with ionizing radiation For example, a drying process for drying the molded body after the injection molding process may be provided, or a heat treatment process may be provided after the ionizing radiation irradiation process.
- Polyamide 66 “Leona 1402S” from Asahi Kasei Corporation
- Sliding agent “Miperon XM220” (ultra high molecular weight polyethylene particles) from Mitsui Chemicals, Inc.
- Crosslinking aid “TAICROS” (triallyl isocyanurate) from Evonik Degussa
- the gear-shaped molded body was irradiated with an electron beam so that the irradiation amount was 120 kGy, and the gear of Test Example 1 was obtained.
- Test Example 2 the same electron beam irradiation as in Test Example 1 was performed to obtain the gear of the test example.
- Test Examples 3 and 4 electron beam irradiation as in Test Example 1 was not performed, and the gear-shaped molded body was used as the gear of the test example.
- the spur gear A of each test example was used as the gear of the above test examples 1 to 4. Further, gears similar to those in Test Examples 1 to 4 except that the spur gear shape was 31 were prepared, and these gears were used as the spur gear B of each test example as a counterpart material. Next, the spur gear A and the spur gear B were meshed, and a sliding test was performed for 100 hours in a 25 ° C. atmosphere in which gears were rotated under the conditions of a tooth surface load of 4.5 N / mm and a rotational speed of 616 rpm. The change in temperature of the spur gear A during the sliding test was measured, and the highest temperature reached was defined as the “maximum temperature during the sliding test”. This maximum temperature is shown in the “maximum temperature” column of Table 1. A non-contact thermometer was used for measuring the temperature of the sliding portion of the spur gear.
- Mass reduction rate [%] (XY) / X ⁇ 100 (1)
- X initial mass of spur gear A [g]
- Y Mass [g] of spur gear A after meshing spur gear A and spur gear B, and performing a fatigue test in which gears are rotated for 100 hours under conditions of a tooth surface load of 4.5 N / mm and a rotational speed of 616 rpm.
- Test Examples 1 and 2 As shown in Table 1, in Test Examples 1 and 2, the mass reduction rate and the reduction rate of the tooth thickness were 0. For this reason, in Test Examples 1 and 2, the maximum temperature during the sliding test was lower than in Test Examples 3 and 4. That is, it can be evaluated that Test Examples 1 and 2 are excellent in the effect of suppressing physical deterioration during sliding due to suppression of temperature rise during sliding.
- Test Examples 3 and 4 the temperature increase during sliding is not suppressed as compared with Test Examples 1 and 2, and it can be evaluated that physical deterioration during sliding occurs from Test Examples 1 and 2. The reason for this is presumed that, for Test Examples 3 and 4, the mass reduction rate exceeded 0.5% or the reduction rate of the toothpick thickness exceeded 0.3%.
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Abstract
Description
質量減少率[%]=(X-Y)/X×100 ・・・(1)
X:ギアの初期質量[g]
Y:歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後のギアの質量[g] A gear according to one embodiment of the present invention made to solve the above-described problem is a gear formed by crosslinking a resin composition containing polyamide 66 and a crosslinking aid, and represented by the following formula (1): The specified mass reduction rate is 0.5% or less.
Mass reduction rate [%] = (XY) / X × 100 (1)
X: initial gear mass [g]
Y: Mass of gear after fatigue test in which gears are rotated for 100 hours under conditions of tooth surface load 4.5 N / mm and rotation speed 616 rpm [g]
質量減少率[%]=(X-Y)/X×100 ・・・(1)
X:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数30、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Aの初期質量[g]
Y:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数31、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Bと平歯車Aとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後の平歯車Aの質量[g] A gear according to another embodiment of the present invention made to solve the above-described problem is a gear formed by crosslinking a resin composition containing polyamide 66 and a crosslinking aid, and is represented by the following formula (1). ) Is a mass reduction rate specified by 0.5) or less.
Mass reduction rate [%] = (XY) / X × 100 (1)
X: initial mass [g] of spur gear A having a tooth width of 5 mm, module 1, number of teeth of 30, and a thickness of 10.7 mm of contiguous teeth of 10.7 mm formed under the same conditions as the gear
Y: The spur gear B and spur gear A having a tooth width of 5 mm, module 1, number of teeth 31 and a continuous tooth thickness of 10.7 mm, which are formed under the same conditions as the gear, mesh with each other, and the tooth load 4 Mass of the spur gear A after a fatigue test in which the gears are rotated for 100 hours under conditions of 5 N / mm and a rotation speed of 616 rpm [g]
またぎ歯厚の減少率[%]=(P-Q)/P×100 ・・・(2)
P:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数30の平歯車Aの連続する8枚の歯のまたぎ歯厚[mm]
Q:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数31であり、連続する8枚の歯のまたぎ歯厚が平歯車Aと等しい平歯車Bと平歯車Aとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後の平歯車Aの連続する8枚の歯のまたぎ歯厚[mm] A gear according to another embodiment of the present invention, which has been made to solve the above problems, is a gear formed by crosslinking a resin composition containing polyamide 66 and a crosslinking aid, and has the following formula ( The reduction rate of the tooth thickness defined in 2) is 0.3% or less.
Decrease rate of tooth thickness [%] = (PQ) / P × 100 (2)
P: Thickness [mm] of 8 consecutive teeth of a spur gear A having a tooth width of 5 mm, a module 1, and 30 teeth formed under the same conditions as the gear
Q: A spur gear B and a spur gear A, which have a tooth width of 5 mm, a module 1, and a number of teeth 31 formed under the same conditions as the gear, and the thickness of the continuous eight teeth is equal to the spur gear A, Thickness [mm] of 8 consecutive teeth of spur gear A after a fatigue test in which gears are rotated for 100 hours under conditions of a tooth surface load of 4.5 N / mm and a rotational speed of 616 rpm [mm]
質量減少率[%]=(X-Y)/X×100 ・・・(1)
X:ギアの初期質量[g]
Y:歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後のギアの質量[g] A gear manufacturing method according to one aspect of the present invention made to solve the above-described problems is obtained by an injection molding step of injection molding a resin composition containing polyamide 66 and a crosslinking aid, and the injection molding step. A method of manufacturing a gear including an ionizing radiation irradiation step of irradiating the molded body with ionizing radiation, wherein the mass reduction rate defined by the following formula (1) of the obtained gear is 0.5% or less.
Mass reduction rate [%] = (XY) / X × 100 (1)
X: initial gear mass [g]
Y: Mass of gear after fatigue test in which gears are rotated for 100 hours under conditions of tooth surface load 4.5 N / mm and rotation speed 616 rpm [g]
質量減少率[%]=(X-Y)/X×100 ・・・(1)
X:得られるギアと同じ条件で形成した歯幅5mm、モジュール1、歯数30、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Aの初期質量[g]
Y:得られるギアと同じ条件で形成した歯幅5mm、モジュール1、歯数31、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Bと平歯車Aとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後の平歯車Aの質量[g] Another aspect of the present invention, which is a gear manufacturing method for solving the above-described problems, is an injection molding step of injection molding a resin composition containing polyamide 66 and a crosslinking aid, and the injection molding step. An ionizing radiation irradiating step for irradiating an ionizing radiation to the obtained molded body, wherein the mass reduction rate defined by the following formula (1) of the obtained gear is 0.5% or less. is there.
Mass reduction rate [%] = (XY) / X × 100 (1)
X: Initial mass [g] of spur gear A having a tooth width of 5 mm, module 1, number of teeth 30 and a continuous tooth thickness of 10.7 mm formed under the same conditions as the obtained gear
Y: meshing spur gear B and spur gear A having a tooth width of 5 mm, module 1, number of teeth of 31 and a thickness of 10.7 mm, which is a continuous gear tooth, formed under the same conditions as the obtained gear, and tooth load Mass [g] of spur gear A after a fatigue test in which gears are rotated for 100 hours under conditions of 4.5 N / mm and a rotational speed of 616 rpm
またぎ歯厚の減少率[%]=(P-Q)/P×100 ・・・(2)
P:得られるギアと同じ条件で形成した歯幅5mm、モジュール1、歯数30の平歯車Aの連続する8枚の歯のまたぎ歯厚[mm]
Q:得られるギアと同じ条件で形成した歯幅5mm、モジュール1、歯数31であり、連続する8枚の歯のまたぎ歯厚が平歯車Aと等しい平歯車Bと平歯車Aとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後の平歯車Aの連続する8枚の歯のまたぎ歯厚[mm] Another aspect of the gear manufacturing method according to the present invention made to solve the above problems is an injection molding step of injection molding a resin composition containing polyamide 66 and a crosslinking aid, and the injection molding step. A method of manufacturing a gear including an ionizing radiation irradiation step of irradiating an ionizing radiation to the molded body obtained in the step, wherein the reduction rate of the tooth thickness defined by the following formula (2) of the gear is 0.3. % Or less.
Decrease rate of tooth thickness [%] = (PQ) / P × 100 (2)
P: Thickness [mm] of 8 consecutive teeth of a spur gear A having a tooth width of 5 mm, a module 1, and 30 teeth formed under the same conditions as the obtained gear
Q: meshing spur gear B and spur gear A with a tooth width of 5 mm, module 1 and number of teeth 31 formed under the same conditions as the gear to be obtained, and the thickness of the continuous eight teeth is equal to spur gear A , The tooth thickness [mm] of the continuous eight teeth of the spur gear A after the fatigue test in which the gears are rotated for 100 hours under the conditions of a tooth surface load of 4.5 N / mm and a rotation speed of 616 rpm
本発明の一態様に係るギアは、ポリアミド66及び架橋助剤を含有する樹脂組成物を架橋することで形成されるギアであって、下記式(1)で規定される質量減少率が0.5%以下である。
質量減少率[%]=(X-Y)/X×100 ・・・(1)
X:ギアの初期質量[g]
Y:歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後のギアの質量[g] [Description of Embodiment of the Present Invention]
A gear according to one embodiment of the present invention is a gear formed by crosslinking a resin composition containing polyamide 66 and a crosslinking aid, and has a mass reduction rate of 0.00 specified by the following formula (1). 5% or less.
Mass reduction rate [%] = (XY) / X × 100 (1)
X: initial gear mass [g]
Y: Mass of gear after fatigue test in which gears are rotated for 100 hours under conditions of tooth surface load 4.5 N / mm and rotation speed 616 rpm [g]
質量減少率[%]=(X-Y)/X×100 ・・・(1)
X:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数30、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Aの初期質量[g]
Y:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数31、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Bと平歯車Aとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後の平歯車Aの質量[g] A gear according to another aspect of the present invention is a gear formed by crosslinking a resin composition containing polyamide 66 and a crosslinking aid, and has a mass reduction rate of 0 defined by the following formula (1). .5% or less.
Mass reduction rate [%] = (XY) / X × 100 (1)
X: initial mass [g] of spur gear A having a tooth width of 5 mm, module 1, number of teeth of 30, and a thickness of 10.7 mm of contiguous teeth of 10.7 mm formed under the same conditions as the gear
Y: The spur gear B and spur gear A having a tooth width of 5 mm, module 1, number of teeth 31 and a continuous tooth thickness of 10.7 mm, which are formed under the same conditions as the gear, mesh with each other, and the tooth load 4 Mass of the spur gear A after a fatigue test in which the gears are rotated for 100 hours under conditions of 5 N / mm and a rotation speed of 616 rpm [g]
またぎ歯厚の減少率[%]=(P-Q)/P×100 ・・・(2)
P:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数30の平歯車Aの連続する8枚の歯のまたぎ歯厚[mm]
Q:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数31であり、連続する8枚の歯のまたぎ歯厚が平歯車Aと等しい平歯車Bと平歯車Aとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後の平歯車Aの連続する8枚の歯のまたぎ歯厚[mm] A gear according to still another aspect of the present invention is a gear formed by cross-linking a resin composition containing polyamide 66 and a cross-linking aid, and having a thickness of a toothpick defined by the following formula (2). The reduction rate is 0.3% or less.
Decrease rate of tooth thickness [%] = (PQ) / P × 100 (2)
P: Thickness [mm] of 8 consecutive teeth of a spur gear A having a tooth width of 5 mm, a module 1, and 30 teeth formed under the same conditions as the gear
Q: A spur gear B and a spur gear A, which have a tooth width of 5 mm, a module 1, and a number of teeth 31 formed under the same conditions as the gear, and the thickness of the continuous eight teeth is equal to the spur gear A, Thickness [mm] of 8 consecutive teeth of spur gear A after a fatigue test in which gears are rotated for 100 hours under conditions of a tooth surface load of 4.5 N / mm and a rotational speed of 616 rpm [mm]
質量減少率[%]=(X-Y)/X×100 ・・・(1)
X:ギアの初期質量[g]
Y:歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後のギアの質量[g] The gear manufacturing method according to another aspect of the present invention includes an injection molding step of injection-molding a resin composition containing polyamide 66 and a crosslinking aid, and irradiating ionized radiation to a molded body obtained in the injection molding step. The mass reduction rate prescribed | regulated by following formula (1) of the gear which is provided with the ionizing radiation irradiation process to perform, Comprising: 0.5% or less is obtained.
Mass reduction rate [%] = (XY) / X × 100 (1)
X: initial gear mass [g]
Y: Mass of gear after fatigue test in which gears are rotated for 100 hours under conditions of tooth surface load 4.5 N / mm and rotation speed 616 rpm [g]
質量減少率[%]=(X-Y)/X×100 ・・・(1)
X:得られるギアと同じ条件で形成した歯幅5mm、モジュール1、歯数30、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Aの初期質量[g]
Y:得られるギアと同じ条件で形成した歯幅5mm、モジュール1、歯数31、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Bと平歯車Aとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後の平歯車Aの質量[g] A gear manufacturing method according to still another aspect of the present invention includes an injection molding step of injection molding a resin composition containing polyamide 66 and a crosslinking aid, and ionizing radiation on a molded body obtained by the injection molding step. A method of manufacturing a gear including an ionizing radiation irradiation step of irradiating, wherein a mass reduction rate defined by the following formula (1) of the obtained gear is 0.5% or less.
Mass reduction rate [%] = (XY) / X × 100 (1)
X: Initial mass [g] of spur gear A having a tooth width of 5 mm, module 1, number of teeth 30 and a continuous tooth thickness of 10.7 mm formed under the same conditions as the obtained gear
Y: meshing spur gear B and spur gear A having a tooth width of 5 mm, module 1, number of teeth of 31 and a thickness of 10.7 mm, which is a continuous gear tooth, formed under the same conditions as the obtained gear, and tooth load Mass [g] of spur gear A after a fatigue test in which gears are rotated for 100 hours under conditions of 4.5 N / mm and a rotational speed of 616 rpm
またぎ歯厚の減少率[%]=(P-Q)/P×100 ・・・(2)
P:得られるギアと同じ条件で形成した歯幅5mm、モジュール1、歯数30の平歯車Aの連続する8枚の歯のまたぎ歯厚[mm]
Q:得られるギアと同じ条件で形成した歯幅5mm、モジュール1、歯数31であり、連続する8枚の歯のまたぎ歯厚が平歯車Aと等しい平歯車Bと平歯車Aとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後の平歯車Aの連続する8枚の歯のまたぎ歯厚[mm] The gear manufacturing method according to still another aspect of the present invention includes an injection molding step of injection-molding a resin composition containing polyamide 66 and a crosslinking aid, and ionizing radiation to a molded body obtained in the injection molding step. A method of manufacturing a gear including an ionizing radiation irradiation step of irradiating, wherein a reduction rate of the tooth thickness defined by the following formula (2) of the obtained gear is 0.3% or less.
Decrease rate of tooth thickness [%] = (PQ) / P × 100 (2)
P: Thickness [mm] of 8 consecutive teeth of a spur gear A having a tooth width of 5 mm, a module 1, and 30 teeth formed under the same conditions as the obtained gear
Q: meshing spur gear B and spur gear A with a tooth width of 5 mm, module 1 and number of teeth 31 formed under the same conditions as the gear to be obtained, and the thickness of the continuous eight teeth is equal to spur gear A , The tooth thickness [mm] of the continuous eight teeth of the spur gear A after the fatigue test in which the gears are rotated for 100 hours under the conditions of a tooth surface load of 4.5 N / mm and a rotation speed of 616 rpm
以下、本発明に係るギア、及びギアの製造方法について説明する。 [Details of the embodiment of the present invention]
Hereinafter, the gear and the manufacturing method of the gear according to the present invention will be described.
第一実施形態の当該ギアは、ポリアミド66及び架橋助剤を含有する樹脂組成物を架橋することで形成され、下記式(1)で規定される質量減少率が0.5%以下である。
質量減少率[%]=(X-Y)/X×100 ・・・(1)
X:ギアの初期質量[g]
Y:歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後のギアの質量[g] <Gear of the first embodiment>
The gear according to the first embodiment is formed by crosslinking a resin composition containing polyamide 66 and a crosslinking aid, and the mass reduction rate defined by the following formula (1) is 0.5% or less.
Mass reduction rate [%] = (XY) / X × 100 (1)
X: initial gear mass [g]
Y: Mass of gear after fatigue test in which gears are rotated for 100 hours under conditions of tooth surface load 4.5 N / mm and rotation speed 616 rpm [g]
当該ギアは、ポリアミド66及び上記架橋助剤を含有する樹脂組成物を架橋することで形成される。 (Resin composition)
The gear is formed by crosslinking a polyamide 66 and a resin composition containing the crosslinking aid.
ポリテトラフルオロエチレン、ポリテトラフルオロエチレン・パーフルオロアルコキシエチレン共重合体、ポリテトラフルオロエチレン・ポリヘキサフルオロプロピレンなどのフッ素樹脂;
ポリジメチルシロキサン、ポリメチルフェニルシロキサン、アミノ変性ポリジメチルシロキサン、エポキシ変性ポリジメチルシロキサン、アルコール変性ポリジメチルシロキサン、カルボキシ変性ポリジメチルシロキサン、フッ素変性ポリジメチルシロキサン等のシリコーン;
グラファイト等の層状無機化合物;
ガラス繊維、チタン酸カリウムウィスカ、酸化亜鉛ウィスカ、ボロン酸ウィスカ等の無機繊維;
LCP繊維、アラミド繊維、カーボン繊維等の有機繊維;
アルミナ、シリカ、タルク等の無機粒子;
メタリン酸塩、ピロリン酸塩、リン酸水素カルシウム、リン酸水素カリウム、リン酸バリウム、リン酸リチウム、メタリン酸カルシウム、ピロリン酸亜鉛等のリン酸塩;
スピンドル油、タービン油、マシン油、ダイナモ油等の鉱物油;
モンタン酸カルシウム等のモンタン酸塩;
二酸化モリブテンなどが挙げられる。なお、上記摺動剤は、単独で又は2種以上組み合わせて用いることができる。 Examples of the sliding agent include polyethylene such as ultra high molecular weight polyethylene, and polyolefin such as polypropylene;
Fluororesin such as polytetrafluoroethylene, polytetrafluoroethylene / perfluoroalkoxyethylene copolymer, polytetrafluoroethylene / polyhexafluoropropylene;
Silicones such as polydimethylsiloxane, polymethylphenylsiloxane, amino-modified polydimethylsiloxane, epoxy-modified polydimethylsiloxane, alcohol-modified polydimethylsiloxane, carboxy-modified polydimethylsiloxane, fluorine-modified polydimethylsiloxane;
Layered inorganic compounds such as graphite;
Inorganic fibers such as glass fiber, potassium titanate whisker, zinc oxide whisker, boronic acid whisker;
Organic fibers such as LCP fiber, aramid fiber, carbon fiber;
Inorganic particles such as alumina, silica, talc;
Phosphates such as metaphosphate, pyrophosphate, calcium hydrogen phosphate, potassium hydrogen phosphate, barium phosphate, lithium phosphate, calcium metaphosphate, zinc pyrophosphate;
Mineral oils such as spindle oil, turbine oil, machine oil, dynamo oil;
Montanates such as calcium montanate;
Examples thereof include molybdenum dioxide. In addition, the said sliding agent can be used individually or in combination of 2 or more types.
当該ギアの下記式(1)で規定される質量減少率(第1の質量減少率)の上限としては、0.5%であり、0.3%がより好ましく、0.1%がさらに好ましい。上記質量減少率が上記上限以下であることで、摺動中における物理的劣化抑制効果を促進できる。これは、式(1)で規定される質量減少率が特定の値以下であると、ギアが変形しにくく、摺動中のギアにおいてかみ合わせの良好な状態が維持されることにより摺動中の温度上昇が抑制されるためと推測される。
質量減少率[%]=(X-Y)/X×100 ・・・(1)
X:ギアの初期質量[g]
Y:歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後のギアの質量[g] (First mass reduction rate)
The upper limit of the mass reduction rate (first mass reduction rate) defined by the following formula (1) of the gear is 0.5%, more preferably 0.3%, and even more preferably 0.1%. . When the mass reduction rate is equal to or less than the upper limit, the effect of suppressing physical deterioration during sliding can be promoted. This is because when the mass reduction rate defined by the expression (1) is a specific value or less, the gear is difficult to deform, and a good meshing state is maintained in the sliding gear. It is estimated that the temperature rise is suppressed.
Mass reduction rate [%] = (XY) / X × 100 (1)
X: initial gear mass [g]
Y: Mass of gear after fatigue test in which gears are rotated for 100 hours under conditions of tooth surface load 4.5 N / mm and rotation speed 616 rpm [g]
また、当該ギアを一定形状の平歯車Aにした際の上記式(1)で規定される質量減少率(第2の質量減少率)の上限としては、0.5%が好ましく、0.3%がより好ましく、0.1%がさらに好ましい。ただし、第2の質量減少率では、上記式(1)において、X、Yは以下とする。なお、「当該ギアを平歯車Aにする」とは、当該ギアの形成方法と同じ条件で平歯車Aを形成することを意味する。また、「当該ギアと同じ条件で形成する」とは、当該ギアの形成に用いた樹脂組成物と同じ樹脂組成物を用い、かつ当該ギアと同じ工程(製造方法)で平歯車A及び平歯車Bを形成することを意味する。
X:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数30、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Aの初期質量[g]
Y:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数31、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Bと平歯車Aとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後の平歯車Aの質量[g] (Second mass reduction rate)
The upper limit of the mass reduction rate (second mass reduction rate) defined by the above formula (1) when the gear is a spur gear A having a fixed shape is preferably 0.5%, 0.3 % Is more preferable, and 0.1% is more preferable. However, in the second mass reduction rate, X and Y are as follows in the above formula (1). Note that “the gear is changed to the spur gear A” means that the spur gear A is formed under the same conditions as the gear formation method. “Forming under the same conditions as the gear” means that the same resin composition as the resin composition used for forming the gear is used, and the spur gear A and the spur gear are manufactured in the same process (manufacturing method) as the gear. This means that B is formed.
X: initial mass [g] of spur gear A having a tooth width of 5 mm, module 1, number of teeth of 30, and a thickness of 10.7 mm of contiguous teeth of 10.7 mm formed under the same conditions as the gear
Y: The spur gear B and spur gear A having a tooth width of 5 mm, module 1, number of teeth 31 and a continuous tooth thickness of 10.7 mm, which are formed under the same conditions as the gear, mesh with each other, and the tooth load 4 Mass of the spur gear A after a fatigue test in which the gears are rotated for 100 hours under conditions of 5 N / mm and a rotation speed of 616 rpm [g]
当該ギアの下記式(2)で規定されるまたぎ歯厚の減少率(第1のまたぎ歯厚の減少率)の上限としては、0.3%が好ましく、0.2%がより好ましく、0.1%がさらに好ましい。上記またぎ歯厚の減少率が上記上限以下であると、ギアの強度、耐久性、耐熱性等を高め、摺動中における物理的劣化抑制効果を促進できる。
またぎ歯厚の減少率[%]=(P-Q)/P×100 ・・・(2)
P:ギアのまたぎ歯厚[mm]
Q:歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験を行った後のギアのまたぎ歯厚[mm] (Decrease rate of first straddle thickness)
The upper limit of the toothpick thickness reduction rate defined by the following formula (2) of the gear (the first toothpick thickness reduction rate) is preferably 0.3%, more preferably 0.2%, and 0 More preferably, 1%. If the reduction rate of the toothpick thickness is less than or equal to the above upper limit, the strength, durability, heat resistance, etc. of the gear can be increased and the effect of suppressing physical deterioration during sliding can be promoted.
Decrease rate of tooth thickness [%] = (PQ) / P × 100 (2)
P: Thickness of gear tooth [mm]
Q: Gear thickness [mm] after a fatigue test in which gears are rotated for 100 hours under conditions of a tooth surface load of 4.5 N / mm and a rotation speed of 616 rpm
また、当該ギアを一定形状の平歯車Aにした際の上記式(2)で規定されるまたぎ歯厚の減少率(第2のまたぎ歯厚の減少率)の上限としては、0.3%が好ましく、0.2%がより好ましく、0.1%がさらに好ましい。ただし、第2のまたぎ歯厚の減少率では、上記式(2)において、P、Qは以下とする。
P:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数30の平歯車Aの連続する8枚の歯のまたぎ歯厚[mm]
Q:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数31であり、連続する8枚の歯のまたぎ歯厚が平歯車Aと等しい平歯車Bと平歯車Aとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後の平歯車Aの連続する8枚の歯のまたぎ歯厚[mm] (Decrease rate of second straddle thickness)
Moreover, as an upper limit of the reduction rate of the toothpick thickness (the reduction rate of the second toothpick thickness) defined by the above formula (2) when the gear is a spur gear A having a fixed shape, 0.3% Is preferable, 0.2% is more preferable, and 0.1% is more preferable. However, in the reduction rate of the second straddle tooth thickness, P and Q are as follows in the above formula (2).
P: Thickness [mm] of 8 consecutive teeth of a spur gear A having a tooth width of 5 mm, a module 1, and 30 teeth formed under the same conditions as the gear
Q: A spur gear B and a spur gear A, which have a tooth width of 5 mm, a module 1, and a number of teeth 31 formed under the same conditions as the gear, and the thickness of the continuous eight teeth is equal to the spur gear A, Thickness [mm] of 8 consecutive teeth of spur gear A after a fatigue test in which gears are rotated for 100 hours under conditions of a tooth surface load of 4.5 N / mm and a rotational speed of 616 rpm [mm]
当該ギアの下記の摺動試験中の最大温度の上限としては、75℃が好ましく、70℃がより好ましく、50℃がさらに好ましい。上記最大温度が上記上限以下であると、摺動中における物理的劣化抑制効果を促進できる。上記摺動試験は、当該ギアと同じ条件で、歯幅5mm、モジュール1、歯数30、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Aと歯幅5mm、モジュール1、歯数31、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Bとを作製し、平歯車Aと平歯車Bとをかみ合わせ、25℃雰囲気下、歯面荷重4.5N/mm、回転数616rpmの条件でギア同士を100時間回転させて行う。 (Maximum temperature)
The upper limit of the maximum temperature during the following sliding test of the gear is preferably 75 ° C, more preferably 70 ° C, and further preferably 50 ° C. When the maximum temperature is not more than the upper limit, the effect of suppressing physical deterioration during sliding can be promoted. The above sliding test is performed under the same conditions as the gear, with a tooth width of 5 mm, module 1, number of teeth 30, spur gear A having a continuous tooth thickness of 10.7 mm and a tooth width of 5 mm, module 1, tooth A spur gear B having a thickness of 10.7 mm consisting of eight continuous teeth is manufactured, and the spur gear A and the spur gear B are meshed with each other, and the tooth surface load is 4.5 N / mm in a 25 ° C. atmosphere. This is performed by rotating the gears for 100 hours under the condition of a rotation speed of 616 rpm.
当該ギアの260℃における動的粘弾性率の下限としては、1MPaが好ましく、1.5MPaがより好ましく、2MPaがさらに好ましい。上記動的粘弾性率が上記下限未満である場合、ギアが十分な架橋密度を得ることができず、摺動中における物理的劣化抑制効果を十分に得られないおそれがある。 (Dynamic viscoelastic modulus at 260 ° C.)
The lower limit of the dynamic viscoelastic modulus at 260 ° C. of the gear is preferably 1 MPa, more preferably 1.5 MPa, and further preferably 2 MPa. If the dynamic viscoelastic modulus is less than the lower limit, the gear cannot obtain a sufficient crosslinking density, and there is a possibility that the effect of suppressing physical deterioration during sliding cannot be obtained sufficiently.
第二実施形態の当該ギアは、ポリアミド66及び架橋助剤を含有する樹脂組成物を架橋することで形成され、下記式(1)で規定される質量減少率が0.5%以下である。
質量減少率[%]=(X-Y)/X×100 ・・・(1)
X:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数30、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Aの初期質量[g]
Y:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数31、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Bと平歯車Aとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後の平歯車Aの質量[g] <Gear of the second embodiment>
The gear according to the second embodiment is formed by crosslinking a resin composition containing polyamide 66 and a crosslinking aid, and the mass reduction rate defined by the following formula (1) is 0.5% or less.
Mass reduction rate [%] = (XY) / X × 100 (1)
X: initial mass [g] of spur gear A having a tooth width of 5 mm, module 1, number of teeth of 30, and a thickness of 10.7 mm of contiguous teeth of 10.7 mm formed under the same conditions as the gear
Y: The spur gear B and spur gear A having a tooth width of 5 mm, module 1, number of teeth 31 and a continuous tooth thickness of 10.7 mm, which are formed under the same conditions as the gear, mesh with each other, and the tooth load 4 Mass of the spur gear A after a fatigue test in which the gears are rotated for 100 hours under conditions of 5 N / mm and a rotation speed of 616 rpm [g]
第三実施形態の当該ギアは、ポリアミド66及び架橋助剤を含有する樹脂組成物を架橋することで形成され、下記式(2)で規定されるまたぎ歯厚の減少率が0.3%以下である。
またぎ歯厚の減少率[%]=(P-Q)/P×100 ・・・(2)
P:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数30の平歯車Aの連続する8枚の歯のまたぎ歯厚[mm]
Q:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数31であり、連続する8枚の歯のまたぎ歯厚が平歯車Aと等しい平歯車Bと平歯車Aとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後の平歯車Aの連続する8枚の歯のまたぎ歯厚[mm] <Gear of the third embodiment>
The gear of the third embodiment is formed by cross-linking a resin composition containing polyamide 66 and a cross-linking aid, and the reduction rate of the tooth thickness defined by the following formula (2) is 0.3% or less. It is.
Decrease rate of tooth thickness [%] = (PQ) / P × 100 (2)
P: Thickness [mm] of 8 consecutive teeth of a spur gear A having a tooth width of 5 mm, a module 1, and 30 teeth formed under the same conditions as the gear
Q: A spur gear B and a spur gear A, which have a tooth width of 5 mm, a module 1, and a number of teeth 31 formed under the same conditions as the gear, and the thickness of the continuous eight teeth is equal to the spur gear A, Thickness [mm] of 8 consecutive teeth of spur gear A after a fatigue test in which gears are rotated for 100 hours under conditions of a tooth surface load of 4.5 N / mm and a rotational speed of 616 rpm [mm]
上記第一実施形態、第二実施形態及び第三実施形態の当該ギアの製造方法は、ポリアミド66及び上記架橋助剤を含有する上記樹脂組成物を射出成形する射出成形工程と、上記射出成形工程で得られた成形体に電離放射線を照射する電離放射線照射工程とを備える。当該ギアの製造方法によれば、当該ギアを容易に得ることができる。 <Gear manufacturing method>
The gear manufacturing method according to the first embodiment, the second embodiment, and the third embodiment includes an injection molding step of injection molding the resin composition containing polyamide 66 and the crosslinking aid, and the injection molding step. And an ionizing radiation irradiating step for irradiating the molded body obtained in the above with ionizing radiation. According to the gear manufacturing method, the gear can be easily obtained.
射出成形工程では、上記樹脂組成物を射出成形し、所望のギア形状を有する成形体を得る。 (Injection molding process)
In the injection molding step, the resin composition is injection molded to obtain a molded body having a desired gear shape.
電離放射線照射工程では、上記射出成形工程で得られた成形体に電離放射線を照射し、成形体を架橋する。 (Ionizing radiation irradiation process)
In the ionizing radiation irradiation step, the molded body obtained in the injection molding step is irradiated with ionizing radiation to crosslink the molded body.
上記開示された実施形態は全ての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記実施形態の構成に限定されるものではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味及び範囲内での全ての変更が含まれることが意図される。 [Other Embodiments]
The disclosed embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is not limited to the configuration of the embodiment described above, but is defined by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims. The
ポリアミド66:旭化成せんい社の「レオナ 1402S」
摺動剤:三井化学社の「ミペロン XM220」(超高分子量ポリエチレン粒子)
架橋助剤:エボニックデグサ社の「TAICROS」(トリアリルイソシアヌレート) The details of each component used in the test examples are as follows.
Polyamide 66: “Leona 1402S” from Asahi Kasei Corporation
Sliding agent: “Miperon XM220” (ultra high molecular weight polyethylene particles) from Mitsui Chemicals, Inc.
Crosslinking aid: “TAICROS” (triallyl isocyanurate) from Evonik Degussa
まず、100質量部のポリアミド66及び5質量部の架橋助剤を混合し、樹脂組成物を得た。次に、この樹脂組成物を2軸混合機に投入し、240℃で溶融混合した。溶融混合後、2軸混合機から樹脂組成物を吐出し、その吐出物を水冷し細断して、ペレット状の樹脂組成物を得た。次に、ペレット状の樹脂組成物を射出成形機に投入し、射出成形機による射出成形を行い、ギア状成形体(歯幅5mm、モジュール1、歯数30、またぎ歯厚(連続する8枚の歯のまたぎ歯厚)10.7mmの平歯車形状)を得た。なお、射出成形の条件は、射出温度240℃、金型温度80℃、射出圧100kg/cm2、保圧時間10秒とした。 [Test Example 1]
First, 100 parts by mass of polyamide 66 and 5 parts by mass of a crosslinking aid were mixed to obtain a resin composition. Next, this resin composition was put into a twin-screw mixer and melt-mixed at 240 ° C. After melt mixing, the resin composition was discharged from a twin-screw mixer, and the discharged material was cooled with water and chopped to obtain a pellet-shaped resin composition. Next, the pellet-shaped resin composition is put into an injection molding machine, and injection molding is performed by an injection molding machine. A gear-shaped molded body (tooth width 5 mm, module 1, number of teeth 30, straddle thickness (eight continuous sheets) The thickness of the tooth of the tooth of the spur gear of 10.7 mm). The injection molding conditions were an injection temperature of 240 ° C., a mold temperature of 80 ° C., an injection pressure of 100 kg / cm 2 , and a pressure holding time of 10 seconds.
樹脂組成物の組成を下記表1に示す組成としたこと以外は上記試験例1と同様にして、ギア状成形体(歯幅5mm、モジュール1、歯数30、またぎ歯厚(連続する8枚の歯のまたぎ歯厚)10.7mmの平歯車形状)を得た。 [Test Examples 2 to 4]
A gear-shaped molded product (tooth width 5 mm, module 1, number of teeth 30, tooth thickness (continuous 8 sheets), except that the resin composition was changed to the composition shown in Table 1 below. The thickness of the tooth of the tooth of the spur gear of 10.7 mm).
得られた試験例1~4のギアについて、下記項目の評価を行った。 [Evaluation]
The obtained gears of Test Examples 1 to 4 were evaluated for the following items.
上記試験例1~4のギアを各試験例の平歯車Aとした。さらに歯数31の平歯車形状としたこと以外は上記試験例1~4と同様のギアをそれぞれ作製し、これらのギアを相手材としての各試験例の平歯車Bとした。次に、平歯車Aと平歯車Bとをかみ合わせ、25℃雰囲気下、歯面荷重4.5N/mm、回転数616rpmの条件でギア同士を回転させる摺動試験を100時間行った。摺動試験中の平歯車Aの温度変化を測定し、到達した最高温度を「摺動試験中の最大温度」とした。この最大温度を表1の「最大温度」の欄に示す。なお、平歯車の摺動部の温度測定には、非接触温度計を用いた。 (Maximum temperature during sliding test)
The spur gear A of each test example was used as the gear of the above test examples 1 to 4. Further, gears similar to those in Test Examples 1 to 4 except that the spur gear shape was 31 were prepared, and these gears were used as the spur gear B of each test example as a counterpart material. Next, the spur gear A and the spur gear B were meshed, and a sliding test was performed for 100 hours in a 25 ° C. atmosphere in which gears were rotated under the conditions of a tooth surface load of 4.5 N / mm and a rotational speed of 616 rpm. The change in temperature of the spur gear A during the sliding test was measured, and the highest temperature reached was defined as the “maximum temperature during the sliding test”. This maximum temperature is shown in the “maximum temperature” column of Table 1. A non-contact thermometer was used for measuring the temperature of the sliding portion of the spur gear.
上記試験例1~4のギアを各試験例の平歯車Aとした。さらに歯数31の平歯車形状としたこと以外は上記試験例1~4と同様のギアをそれぞれ作製し、これらのギアを相手材としての各試験例の平歯車Bとした。次に、下記式(1)に基づき質量減少率を求めた。その結果を表1の「質量減少率」の欄に示す。
質量減少率[%]=(X-Y)/X×100 ・・・(1)
X:平歯車Aの初期質量[g]
Y:平歯車Aと平歯車Bとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験を行った後の平歯車Aの質量[g] (Mass reduction rate)
The spur gear A of each test example was used as the gear of the above test examples 1 to 4. Further, gears similar to those in Test Examples 1 to 4 except that the spur gear shape was 31 were prepared, and these gears were used as the spur gear B of each test example as a counterpart material. Next, the mass reduction rate was calculated based on the following formula (1). The results are shown in the column of “mass reduction rate” in Table 1.
Mass reduction rate [%] = (XY) / X × 100 (1)
X: initial mass of spur gear A [g]
Y: Mass [g] of spur gear A after meshing spur gear A and spur gear B, and performing a fatigue test in which gears are rotated for 100 hours under conditions of a tooth surface load of 4.5 N / mm and a rotational speed of 616 rpm.
上記試験例1~4のギアを各試験例の平歯車Aとした。さらに歯数31の平歯車形状としたこと以外は上記試験例1~4と同様のギアをそれぞれ作製し、これらのギアを相手材としての各試験例の平歯車Bとした。次に、下記式(2)に基づきまたぎ歯厚の減少率を求めた。その結果を表1の「またぎ歯厚の減少率」の欄に示す。
またぎ歯厚の減少率[%]=(P-Q)/P×100 ・・・(2)
P:平歯車Aのまたぎ歯厚(連続する8枚の歯のまたぎ歯厚)[mm]
Q:平歯車Aと平歯車Bとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験を行った後の平歯車Aのまたぎ歯厚(連続する8枚の歯のまたぎ歯厚)[mm] (Decrease rate of straddle thickness)
The spur gear A of each test example was used as the gear of the above test examples 1 to 4. Further, gears similar to those in Test Examples 1 to 4 except that the spur gear shape was 31 were prepared, and these gears were used as the spur gear B of each test example as a counterpart material. Next, the reduction rate of the tooth thickness was determined based on the following formula (2). The results are shown in the column “Decrease rate of straddle thickness” in Table 1.
Decrease rate of tooth thickness [%] = (PQ) / P × 100 (2)
P: Spur gear thickness of spur gear A (spacing tooth thickness of 8 consecutive teeth) [mm]
Q: Spur gear thickness of spur gear A after meshing spur gear A and spur gear B, and performing a fatigue test in which gears rotate for 100 hours under conditions of a tooth surface load of 4.5 N / mm and a rotational speed of 616 rpm ( (Thickness of the teeth of 8 consecutive teeth) [mm]
JIS-K-7244-1(1998年)に準拠し、動的粘弾性測定装置(アイティー計測制御社製の「DVA-200」)を用いて、260℃における動的粘弾性率を測定した。その結果を表1の「動的粘弾性率」の欄に示す。 (Dynamic viscoelastic modulus at 260 ° C.)
In accordance with JIS-K-7244-1 (1998), the dynamic viscoelasticity at 260 ° C. was measured using a dynamic viscoelasticity measuring device (“DVA-200” manufactured by IT Measurement & Control Co., Ltd.). . The results are shown in the “dynamic viscoelastic modulus” column of Table 1.
On the other hand, in Test Examples 3 and 4, the temperature increase during sliding is not suppressed as compared with Test Examples 1 and 2, and it can be evaluated that physical deterioration during sliding occurs from Test Examples 1 and 2. The reason for this is presumed that, for Test Examples 3 and 4, the mass reduction rate exceeded 0.5% or the reduction rate of the toothpick thickness exceeded 0.3%.
Claims (9)
- ポリアミド66及び架橋助剤を含有する樹脂組成物を架橋することで形成されるギアであって、
下記式(1)で規定される質量減少率が0.5%以下であるギア。
質量減少率[%]=(X-Y)/X×100 ・・・(1)
X:ギアの初期質量[g]
Y:歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後のギアの質量[g] A gear formed by crosslinking a resin composition containing polyamide 66 and a crosslinking aid,
A gear whose mass reduction rate defined by the following formula (1) is 0.5% or less.
Mass reduction rate [%] = (XY) / X × 100 (1)
X: initial gear mass [g]
Y: Mass of gear after fatigue test in which gears are rotated for 100 hours under conditions of tooth surface load 4.5 N / mm and rotation speed 616 rpm [g] - ポリアミド66及び架橋助剤を含有する樹脂組成物を架橋することで形成されるギアであって、
下記式(1)で規定される質量減少率が0.5%以下であるギア。
質量減少率[%]=(X-Y)/X×100 ・・・(1)
X:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数30、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Aの初期質量[g]
Y:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数31、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Bと平歯車Aとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後の平歯車Aの質量[g] A gear formed by crosslinking a resin composition containing polyamide 66 and a crosslinking aid,
A gear whose mass reduction rate defined by the following formula (1) is 0.5% or less.
Mass reduction rate [%] = (XY) / X × 100 (1)
X: initial mass [g] of spur gear A having a tooth width of 5 mm, module 1, number of teeth of 30, and a thickness of 10.7 mm of contiguous teeth of 10.7 mm formed under the same conditions as the gear
Y: The spur gear B and spur gear A having a tooth width of 5 mm, module 1, number of teeth 31 and a continuous tooth thickness of 10.7 mm, which are formed under the same conditions as the gear, mesh with each other, and the tooth load 4 Mass of the spur gear A after a fatigue test in which the gears are rotated for 100 hours under conditions of 5 N / mm and a rotation speed of 616 rpm [g] - ポリアミド66及び架橋助剤を含有する樹脂組成物を架橋することで形成されるギアであって、
下記式(2)で規定されるまたぎ歯厚の減少率が0.3%以下であるギア。
またぎ歯厚の減少率[%]=(P-Q)/P×100 ・・・(2)
P:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数30の平歯車Aの連続する8枚の歯のまたぎ歯厚[mm]
Q:当該ギアと同じ条件で形成した歯幅5mm、モジュール1、歯数31であり、連続する8枚の歯のまたぎ歯厚が平歯車Aと等しい平歯車Bと平歯車Aとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後の平歯車Aの連続する8枚の歯のまたぎ歯厚[mm] A gear formed by crosslinking a resin composition containing polyamide 66 and a crosslinking aid,
A gear in which the reduction rate of the thickness of the toothpick defined by the following formula (2) is 0.3% or less.
Decrease rate of tooth thickness [%] = (PQ) / P × 100 (2)
P: Thickness [mm] of 8 consecutive teeth of a spur gear A having a tooth width of 5 mm, a module 1, and 30 teeth formed under the same conditions as the gear
Q: A spur gear B and a spur gear A, which have a tooth width of 5 mm, a module 1, and a number of teeth 31 formed under the same conditions as the gear, and the thickness of the continuous eight teeth is equal to the spur gear A, Thickness [mm] of 8 consecutive teeth of spur gear A after a fatigue test in which gears are rotated for 100 hours under conditions of a tooth surface load of 4.5 N / mm and a rotational speed of 616 rpm [mm] - 260℃における動的粘弾性率が1MPa以上である請求項1、請求項2又は請求項3に記載のギア。 The gear according to claim 1, 2 or 3, wherein the dynamic viscoelasticity at 260 ° C is 1 MPa or more.
- 上記架橋助剤が、トリアリルイソシアヌレートを含む請求項1から請求項4のいずれか1項に記載のギア。 The gear according to any one of claims 1 to 4, wherein the crosslinking assistant contains triallyl isocyanurate.
- 上記架橋助剤の含有量が、ポリアミド66の100質量部に対し、1質量部以上10質量部以下である請求項1から請求項5のいずれか1項に記載のギア。 The gear according to any one of claims 1 to 5, wherein a content of the crosslinking aid is 1 part by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the polyamide 66.
- ポリアミド66及び架橋助剤を含有する樹脂組成物を射出成形する射出成形工程と、
上記射出成形工程で得られた成形体に電離放射線を照射する電離放射線照射工程と
を備えるギアの製造方法であって、
得られるギアの下記式(1)で規定される質量減少率が0.5%以下であるギアの製造方法。
質量減少率[%]=(X-Y)/X×100 ・・・(1)
X:ギアの初期質量[g]
Y:歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後のギアの質量[g] An injection molding step of injection molding a resin composition containing polyamide 66 and a crosslinking aid;
An ionizing radiation irradiating step for irradiating the molded body obtained in the injection molding step with ionizing radiation,
A gear manufacturing method in which the mass reduction rate defined by the following formula (1) of the obtained gear is 0.5% or less.
Mass reduction rate [%] = (XY) / X × 100 (1)
X: initial gear mass [g]
Y: Mass of gear after fatigue test in which gears are rotated for 100 hours under conditions of tooth surface load 4.5 N / mm and rotation speed 616 rpm [g] - ポリアミド66及び架橋助剤を含有する樹脂組成物を射出成形する射出成形工程と、
上記射出成形工程で得られた成形体に電離放射線を照射する電離放射線照射工程と
を備えるギアの製造方法であって、
得られるギアの下記式(1)で規定される質量減少率が0.5%以下であるギアの製造方法。
質量減少率[%]=(X-Y)/X×100 ・・・(1)
X:得られるギアと同じ条件で形成した歯幅5mm、モジュール1、歯数30、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Aの初期質量[g]
Y:得られるギアと同じ条件で形成した歯幅5mm、モジュール1、歯数31、連続する8枚の歯のまたぎ歯厚10.7mmの平歯車Bと平歯車Aとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後の平歯車Aの質量[g] An injection molding step of injection molding a resin composition containing polyamide 66 and a crosslinking aid;
An ionizing radiation irradiating step for irradiating the molded body obtained in the injection molding step with ionizing radiation,
A gear manufacturing method in which the mass reduction rate defined by the following formula (1) of the obtained gear is 0.5% or less.
Mass reduction rate [%] = (XY) / X × 100 (1)
X: Initial mass [g] of spur gear A having a tooth width of 5 mm, module 1, number of teeth 30 and a continuous tooth thickness of 10.7 mm formed under the same conditions as the obtained gear
Y: meshing spur gear B and spur gear A having a tooth width of 5 mm, module 1, number of teeth of 31 and a thickness of 10.7 mm, which is a continuous gear tooth, formed under the same conditions as the obtained gear, and tooth load Mass [g] of spur gear A after a fatigue test in which gears are rotated for 100 hours under conditions of 4.5 N / mm and a rotational speed of 616 rpm - ポリアミド66及び架橋助剤を含有する樹脂組成物を射出成形する射出成形工程と、
上記射出成形工程で得られた成形体に電離放射線を照射する電離放射線照射工程と
を備えるギアの製造方法であって、
得られるギアの下記式(2)で規定されるまたぎ歯厚の減少率が0.3%以下であるギアの製造方法。
またぎ歯厚の減少率[%]=(P-Q)/P×100 ・・・(2)
P:得られるギアと同じ条件で形成した歯幅5mm、モジュール1、歯数30の平歯車Aの連続する8枚の歯のまたぎ歯厚[mm]
Q:得られるギアと同じ条件で形成した歯幅5mm、モジュール1、歯数31であり、連続する8枚の歯のまたぎ歯厚が平歯車Aと等しい平歯車Bと平歯車Aとをかみ合わせ、歯面荷重4.5N/mm、回転数616rpmの条件で100時間ギア同士を回転させる疲労試験後の平歯車Aの連続する8枚の歯のまたぎ歯厚[mm]
An injection molding step of injection molding a resin composition containing polyamide 66 and a crosslinking aid;
An ionizing radiation irradiating step for irradiating the molded body obtained in the injection molding step with ionizing radiation,
A gear manufacturing method in which the reduction rate of the tooth thickness defined by the following formula (2) of the obtained gear is 0.3% or less.
Decrease rate of tooth thickness [%] = (PQ) / P × 100 (2)
P: Thickness [mm] of 8 consecutive teeth of a spur gear A having a tooth width of 5 mm, a module 1, and 30 teeth formed under the same conditions as the obtained gear
Q: meshing spur gear B and spur gear A with a tooth width of 5 mm, module 1 and number of teeth 31 formed under the same conditions as the gear to be obtained, and the thickness of the continuous eight teeth is equal to spur gear A , The tooth thickness [mm] of the continuous eight teeth of the spur gear A after the fatigue test in which the gears are rotated for 100 hours under the conditions of a tooth surface load of 4.5 N / mm and a rotation speed of 616 rpm
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JP2017502277A JPWO2018011958A1 (en) | 2016-07-14 | 2016-07-14 | Gear and gear manufacturing method |
KR1020187033857A KR20190031200A (en) | 2016-07-14 | 2016-07-14 | Method for manufacturing gears and gears |
PCT/JP2016/070911 WO2018011958A1 (en) | 2016-07-14 | 2016-07-14 | Gear and gear production method |
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JP2004019820A (en) * | 2002-06-18 | 2004-01-22 | Nsk Ltd | Reduction gear for motor-driven power steering device |
JP2004092893A (en) * | 2002-09-04 | 2004-03-25 | Nsk Ltd | Reduction gear for electric power steering device |
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JP3099396B2 (en) | 1990-03-08 | 2000-10-16 | 日本油脂株式会社 | Sliding property improving agent and sliding property improving method |
JP5837377B2 (en) | 2011-09-15 | 2015-12-24 | ユニチカ株式会社 | Sliding member |
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JP2004019820A (en) * | 2002-06-18 | 2004-01-22 | Nsk Ltd | Reduction gear for motor-driven power steering device |
JP2004092893A (en) * | 2002-09-04 | 2004-03-25 | Nsk Ltd | Reduction gear for electric power steering device |
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