JP4486411B2 - ローラ付きカムフォロア - Google Patents
ローラ付きカムフォロア Download PDFInfo
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- JP4486411B2 JP4486411B2 JP2004158046A JP2004158046A JP4486411B2 JP 4486411 B2 JP4486411 B2 JP 4486411B2 JP 2004158046 A JP2004158046 A JP 2004158046A JP 2004158046 A JP2004158046 A JP 2004158046A JP 4486411 B2 JP4486411 B2 JP 4486411B2
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- Prior art keywords
- roller
- rolling
- cam follower
- surface layer
- austenite
- Prior art date
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- 238000005096 rolling process Methods 0.000 claims description 61
- 229910001566 austenite Inorganic materials 0.000 claims description 58
- 239000002344 surface layer Substances 0.000 claims description 48
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 45
- 229910052757 nitrogen Inorganic materials 0.000 claims description 26
- 239000010410 layer Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 23
- 238000005496 tempering Methods 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 19
- 230000006698 induction Effects 0.000 claims description 17
- 229910000859 α-Fe Inorganic materials 0.000 claims description 16
- 230000000717 retained effect Effects 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 4
- 238000005256 carbonitriding Methods 0.000 description 22
- 229910000831 Steel Inorganic materials 0.000 description 19
- 238000010438 heat treatment Methods 0.000 description 19
- 239000010959 steel Substances 0.000 description 19
- 229910052799 carbon Inorganic materials 0.000 description 16
- 238000012360 testing method Methods 0.000 description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 13
- 150000001247 metal acetylides Chemical class 0.000 description 12
- 229910001567 cementite Inorganic materials 0.000 description 10
- 229910000734 martensite Inorganic materials 0.000 description 10
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 9
- 238000001816 cooling Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 239000013078 crystal Substances 0.000 description 7
- 238000010791 quenching Methods 0.000 description 6
- 230000000171 quenching effect Effects 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000010583 slow cooling Methods 0.000 description 5
- 238000009661 fatigue test Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 238000007542 hardness measurement Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 230000005291 magnetic effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000897 Babbitt (metal) Inorganic materials 0.000 description 1
- 229910017112 Fe—C Inorganic materials 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010273 cold forging Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 150000002829 nitrogen Chemical class 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005480 shot peening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/78—Combined heat-treatments not provided for above
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
- F01L1/146—Push-rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
- F16C13/006—Guiding rollers, wheels or the like, formed by or on the outer element of a single bearing or bearing unit, e.g. two adjacent bearings, whose ratio of length to diameter is generally less than one
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/44—Needle bearings
- F16C19/46—Needle bearings with one row or needles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/62—Selection of substances
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/64—Special methods of manufacture
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/30—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for crankshafts; for camshafts
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2301/00—Using particular materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2303/00—Manufacturing of components used in valve arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2305/00—Valve arrangements comprising rollers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2305/00—Valve arrangements comprising rollers
- F01L2305/02—Mounting of rollers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/90—Surface areas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
- F16C2360/18—Camshafts
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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
- F16H53/00—Cams ; Non-rotary cams; or cam-followers, e.g. rollers for gearing mechanisms
- F16H53/06—Cam-followers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/21—Elements
- Y10T74/2101—Cams
- Y10T74/2107—Follower
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- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Rolling Contact Bearings (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Gears, Cams (AREA)
Description
いが窒素を多く含むため、Fe3(C、N)のように炭窒化物というべきである。しかし、説明を簡単にするため、炭化物というとき、上記炭窒化物も含めて指すこととする。また、通常、鋼材はMnなどを含むため、炭化物の中に固溶して(Fe、Mn)3(C、N)
のような形態をとるが、このような形態を当然含む。さらに、焼戻しが高温で行なわれるとき、M3C型の炭化物だけでなく、M23C6型の炭化物やその他の炭化物をも含むが、上記炭化物にはそのような炭化物をも含んでいる。
は、フェライトやセメンタイトと異なり、強磁性体ではないことを利用して、磁気天秤などの磁気測定装置を用いて測定することもできる。
部25を形成し固定されている。すなわち、ローラ軸の少なくとも両端2aでは硬度をHV300以下に抑制されてかしめ加工が容易にされ、かしめ加工を施されてローラ支持部の面取り部にかしめ加工固定部25を形成している。
パターンである。図6の熱処理パターンにおける徐冷処理また図7における調質処理は、互いに対応しており、表層部以外の部分の硬度を低くすることに寄与している。図6および図7の熱処理パターンのどちらもその後で、転走面のある表層部に高周波焼入れを施し、その後、低温焼戻しを施す。
鋼の炭素濃度によらず窒素富化層が明瞭に生成される。本実施の形態では、かしめ加工を行なうためにミクロ組織にフェライトを含むようにするため、炭素濃度は比較的低くするので、上記窒素富化層には炭素も併せて富化される場合が多い。
り軸受の対象部材に窒素富化層を形成する。この窒素富化層では、鉄原子Feに対する侵入型元素であるC、Nが過共析に侵入し、たとえばオーステナイト中に炭化物が析出している(2相共存)。すなわち、窒素富化層では過共析鋼となっている。また、浸炭窒化処理されない内部では、素材である元々の鋼材の組成により、オーステナイト相となっている。また、素材である鋼材がフェライトとオーステナイトとの2相、またはオーステナイトとセメンタイトとの2相、が共存する温度で浸炭窒化処理を行なってもよい。
処理温度から徐冷する。この徐冷の目的は、組織を軟化し加工性を向上するためである。
この徐冷中に、内部では上記のオーステナイトから、フェライトとセメンタイトとで構成されるパーライトが生成するが、パーライト中のセメンタイトを層状化させずに凝集粗大化させることにより、軟化を推進する。したがって、徐冷する温度域は浸炭窒化処理温度〜(A1点−100℃)程度まででよい。これより低い温度まで徐冷してもセメンタイト
の凝集粗大化は期待できず、時間ばかりかかり能率を低下させる。目安としては620℃程度まででよい。その後は、時間短縮のために空冷してもよいし、水冷や油冷を行なってもよい。
とえば油冷などして焼き入れる。この場合、内部では、もともとの鋼材の組成によりオーステナイトからマルテンサイトなどが生成する。このマルテンサイト組織は硬い。このままでは、かしめ加工は困難なので、上記焼戻処理(調質処理)を行なう。焼戻しはA1点
直下でA1点にできるだけ近い温度で急速に進行する。すなわち、高温焼戻しを行なう。
したがって、焼戻しはA1点〜650℃の範囲、またより好ましくはA1点〜680℃の範囲で行なうことが望ましい。この焼戻しにより、マルテンサイト組織における高い転位密度は消失し、転位密度の低いフェライトと凝集粗大化したセメンタイトとの組織が得られる。
下で長寿命を実現することができる。
図6に対応)および図9に示すヒートパターンH2(図7に対応)の熱処理を施した。す
なわち、鋼管または冷間加工された鋼材に、まずA1点以上で浸炭窒化処理を施し、その
後、ヒートパターンH1またはH2に応じて、(ヒートパターンH1)A1点以下に徐冷(炉冷)するか、または(ヒートパターンH2)A1点以下に急冷後に焼戻し(調質)する。その後、転走面に対応する表層部のみに高周波焼入れを施す。上記のヒートパターンH1、
H2における温度は、図8および図9に示すとおりである。
印加される。
Claims (4)
- ローラと、前記ローラの内方に位置するローラ軸と、前記ローラと前記ローラ軸との間に介在するころとを備え、前記ローラが、前記ローラ軸との間に前記ローラの内周を転走する前記ころを介在させて、前記ローラ軸により支持されたローラ付きカムフォロアであって、
前記ローラ軸における前記ころが転走する転走面の領域の表層部が、高周波焼入れされた窒素富化層であり、かつ、前記転走面の領域の表層部のオーステナイト結晶粒度が11番以上であり、かつ、前記転走面の領域の表層部の硬度がHV653以上の範囲であり、
前記ローラ軸の端部が、硬さがHV(ビッカース硬度)300以下であり、塑性加工されており、ロッカーアームのローラ支持部に固定されている、ローラ付きカムフォロア。 - 前記転走面の領域の表層部以外の領域では、そのミクロ組織がフェライトと炭化物とを有する、請求項1に記載のローラ付きカムフォロア。
- 前記転走面の領域の表層部において残留オーステナイトが10〜50体積%を占める、請求項1または2に記載のローラ付きカムフォロア。
- 前記ローラ軸は、A1点以上で浸炭窒化処理した後にA1点未満にまで徐冷し、次いで前記転走面の領域の表層部を高周波焼入れする処理、およびA1以上で浸炭窒化処理した後、A1点未満にまで急冷し、次いでA1点未満で焼戻しを行ない、その後前記転走面の領域の表層部を高周波焼入れする処理、のいずれかの処理がなされている、請求項1〜3のいずれかに記載のローラ付きカムフォロア。
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JP2004158046A JP4486411B2 (ja) | 2003-06-05 | 2004-05-27 | ローラ付きカムフォロア |
US10/859,120 US7603929B2 (en) | 2003-06-05 | 2004-06-03 | Rolling bearing, cam-follower with roller, and cam |
EP04013289A EP1484517B1 (en) | 2003-06-05 | 2004-06-04 | Rolling bearing, cam follower with roller, and cam |
DE602004013071T DE602004013071T2 (de) | 2003-06-05 | 2004-06-04 | Wälzlager, Nockenfolger mit Roller und zugehörige Nocke |
CNB200410048844XA CN100504092C (zh) | 2003-06-05 | 2004-06-07 | 滚动轴承、凸轮从动件以及凸轮 |
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JP (1) | JP4486411B2 (ja) |
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EP2345822B1 (en) * | 2004-08-02 | 2019-01-09 | NTN Corporation | Rolling bearing for rocker arm and rocker arm |
DE602006021498D1 (de) * | 2005-03-11 | 2011-06-09 | Ntn Toyo Bearing Co Ltd | Wälzlager |
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EP1484517B1 (en) | 2008-04-16 |
CN100504092C (zh) | 2009-06-24 |
JP2005299914A (ja) | 2005-10-27 |
EP1484517A2 (en) | 2004-12-08 |
US20040247216A1 (en) | 2004-12-09 |
DE602004013071T2 (de) | 2009-06-25 |
US7603929B2 (en) | 2009-10-20 |
EP1484517A3 (en) | 2006-05-31 |
DE602004013071D1 (de) | 2008-05-29 |
CN1573148A (zh) | 2005-02-02 |
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