EP0718410B1 - Procédé pour la fabrication de leviers oscillants - Google Patents

Procédé pour la fabrication de leviers oscillants Download PDF

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Publication number
EP0718410B1
EP0718410B1 EP94309203A EP94309203A EP0718410B1 EP 0718410 B1 EP0718410 B1 EP 0718410B1 EP 94309203 A EP94309203 A EP 94309203A EP 94309203 A EP94309203 A EP 94309203A EP 0718410 B1 EP0718410 B1 EP 0718410B1
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EP
European Patent Office
Prior art keywords
rocker arm
weight
intake
guide hole
exhaust
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94309203A
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German (de)
English (en)
Other versions
EP0718410A1 (fr
Inventor
Akira c/o K.K. Honda Fujiwara
Noriyuki c/o K.K. Honda Yamada
Kazushige c/o K.K. Honda Yakubo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
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Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP24959593A priority Critical patent/JP3411637B2/ja
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to EP94309203A priority patent/EP0718410B1/fr
Priority to DE1994626982 priority patent/DE69426982T2/de
Publication of EP0718410A1 publication Critical patent/EP0718410A1/fr
Application granted granted Critical
Publication of EP0718410B1 publication Critical patent/EP0718410B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • 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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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

Definitions

  • the present invention relates to a process for producing rocker arms for internal combustion engines.
  • Table 1 discloses nitriding steel compositions 34 CrAl6 and 34 CrAlMo5 which are similar to the compositions of claims 1 and 2 but do not include the claimed content of Pb or Bi.
  • the above-described nitrided steel may, optionally, further contain 0.15 % (inclusive) to 0.3 % (inclusive) by weight of molybdenum (Mo) in addition to the above-described chemical constituents.
  • rocker arm blank having the composition specified, as described above is subjected to the refining treatment as described above, its properties, such as ductility and toughness, will have been improved to levels optimal for a rocker arm, and the hardness of the blank can be adjusted to a value (HRC) in the range of about 20 to 30, which values are those minimally required to achieve the required strength, when the machinability of the blank is also taken into consideration.
  • HRC a value
  • the shaft insertion holes can be easily formed by subjecting the apertures to a reaming operation.
  • the nitriding treatment causes a surface hardening of the entire rocker arm blank, and improved wear resistance is provided to open surfaces and the inner surface of each shaft insertion hole. Because the nitriding treatment is carried out at a relatively low temperature, thermal strain and the like are not produced in the shaft insertion hole and therefore, finishing of the shaft insertion hole, by machining after the nitriding treatment, is not required.
  • the fabrication of the rocker arm blank of this invention is performed with good efficiency by using forging, machining, or the like treatments, and a refining treatment.
  • the reaming and the nitriding treatment can be carried out upon a large number of rocker arm blanks at the same time, leading to an improved mass-productivity of the rocker arm of this invention.
  • Carbon (C) has the effect of enhancing the core portion of the blank, which is to be covered with a nitrided layer, to increase the tensile strength of a produced rocker arm. However, if the C content is less than 0.3 % by weight, such effect is not obtained. On the other hand, if the C content is more than 0.5 % by weight, a notched portion in a produced rocker arm has a reduced fatigue strength.
  • Manganese (Mn) has the effect of enhancing the hardness of the core portion of the rocker arm blank, as does the carbon (C). However, if the Mn content is less than 0.3 % by weight, such effect is not obtained. On the other hand, if the Mn content is more than 1.5 % by weight, the machinability of the rocker arm blank is degraded as a result of the coalescence of inclusions in the steel.
  • Chromium (Cr) has the effect of promoting the nitriding of the rocker arm blank to increase the depth of the nitrided layer and to increase the fatigue strength of the resulting rocker arm. However, if the Cr content is less than 0.9 % by weight, such effect is not obtained. On the other hand, if the Cr content is more than 1.5 % by weight, the machinability of the rocker arm blank is lowered.
  • Al Similar to chromium (Cr) aluminum (Al) has the effect of increasing the depth of the nitrided layer, and the effect of enhancing the hardness of the nitrided layer to improve the wear resistance of the rocker arm. However, if the Al content is less than 0.7 % by weight, such effects are not obtained. On the other hand, if the Al content is more than 1.5 % by weight, the toughness of the nitrided layer is reduced.
  • Silicon (Si) has the effect of enhancing the toughness of a rocker arm. However, if the Si content is less than 0.35 % by weight, such effect is not obtained, and the machinability of the rocker arm blank is degraded.
  • Phosphorus (P) and sulfur (S) are elongation reducing elements and hence, the P content is set in a range represented by P ⁇ 0.03 % by weight, and the S content is set in a range represented by S ⁇ 0.03 % by weight.
  • the copper (Cu) has the effect of strengthening the steel matrix. However, if the Cu content is more than 0.3 % by weight, the machinability of the rocker arm blank is reduced.
  • Nickel (Ni) has an effect similar to the effect of the copper. However, if the Ni content is more than 0.25 % by weight, the machinability of the rocker arm blank is reduced.
  • each of lead (Pb) and bismuth (Bi) have a machinability enhancing effect. However, if the Pb content is less than 0.04 % by weight or if the Bi content is less than 0.03 % by weight, the machinability of the rocker arm blank is degraded. On the other hand, if the Pb content is more than 0.15 % by weight or if the Bi content is more than 0.1 % by weight, the rocker arm produced from such steel has a reduced fatigue strength.
  • Molybdenum (Mo) has a nitriding promoting effect, i.e., an effect of increasing the hardness of a diffused layer of nitrogen and the effect of enhancing the hardenability of the steel to increase the hardness of the core portion of the rocker arm.
  • Mo content is less than 0.15% by weight, such effects are not obtained.
  • Mo content is more than 0.3% by weigh, the machinability of the rocker arm blank is lowered.
  • the structure does not achieve its desired hardness because the hardness of the core portion is low.
  • (T 1 ) > 950°C and (t 1 ) > 2 hours cracks are produced during the hardening portion of the refining treatment.
  • tempering treating temperature (T 2 ) is lower than 600°C and/or the tempering treating time (t 2 ) is less than 0.5 hours in the tempering portion of the refining treatment, machinability is lowered because of higher hardness.
  • (T 2 ) > 700°C and/or (t 2 ) > 2 hours the rocker arm does not achieve the required strength.
  • nitriding treating temperature (T 3 ) is less than 550°C and the treating time (t 3 ) is less than 5 hours, a sufficient depth of the nitrided layer is not obtained.
  • (T 3 ) > 610°C and/or (t 3 ) > 8 hours the strain in the produced rocker arm is increased to unacceptable levels.
  • Figs. 1 to 5 illustrate an internal combustion engine including a valve operation characteristic changing means.
  • a piston 3 is slidably received in a cylinder bore 2 in a cylinder block 1.
  • a pair of intake bores 6 are defined adjacent each other in a cylinder head 4 to communicate with an intake port 5
  • a pair of exhaust bores 8 are also defined adjacent each other in the cylinder head 4 to communicate with an exhaust port 7. These bores 6 and 8 open toward a combustion chamber 9.
  • An intake valve 10 is disposed in each of the intake bores 6, and an exhaust valve 11 is disposed in each of the exhaust bores 8.
  • Valve rods 12 and 13 of the intake and exhaust valves 10 and 11, respectively, are slidably inserted through guide sleeves 14 and 15, respectively, mounted in the cylinder head 4.
  • Retainers 16, 17, 18 and 19 are mounted at upper ends of the valve rods 12 and 13 and the guide sleeves 14 and 15.
  • Valve springs 20 and 21 are compressed between the opposed retainers 16 and 18 as well as 17 and 19, respectively.
  • Each of the intake valves 10 and each of the exhaust valve 11 are opened and closed by an intake-side valve operating mechanism 22 and an exhaust-side valve operating mechanism 23, respectively.
  • the valve operating mechanisms 22 and 23 are provided with a single common cam shaft 24 which is driven at a rotational ratio of 1/2 synchronously with the revolution of the engine.
  • the intake-side valve operating mechanism 22 includes the cam shaft 24, and first, second and third intake-side rocker arms 25, 26 and 27 provided between the cam shaft 24 and the intake valves 10.
  • the exhaust-side valve operating mechanism 23 includes the cam shaft 24, and first and second exhaust-side rocker arms 28 and 29 provided between the cam shaft 24 and the exhaust valves 11.
  • the cam shaft 24 includes a first intake-side cam 30 operative in correspondence with a high-speed operating range for the engine, a pair of second intake-side cams 31 operative in correspondence with a low-speed operating range for the engine, a circular raised portion 32 disposed between the first intake-side cam 30 and one of the second intake-side cams 31 to correspond to circular base portions of these cams 30 and 31, and an exhaust-side cam 33 disposed between the first intake-side cam 30 and the other of the second intake-side cams 31.
  • a pair of rocker shafts 34 and 35 are disposed parallel to the cam shaft 24.
  • the first, third and second intake-side rocker arms 25, 27 and 26 are pivotally carried in the named order in mutually sliding contact on one of the rocker shafts 34 with support holes 36, 37 and 38 located therebetween, as shown in Figs.2 and 3.
  • the exhaust-side rocker arms 28 and 29 are pivotally carried in mutually sliding contact on the other rocker shaft 35 with support holes 39 and 40 located therebetween, as shown in Fig.4.
  • Each of the first and second intake-side rocker arms 25 and 26 has a slipper surface forming piece 41, 42 provided at one end, respectively to come into sliding contact with the second intake-side cam 31 from above, and a tappet screw 43 provided at the other end to abut against the upper end of the valve rod 12 of the intake valve 10.
  • the third intake-side rocker arm 27 has a slipper surface forming piece 44 provided at one end to come into sliding contact with the first intake-side cam 30 from above, and a bottomed cylindrical lifter 45 abuts against a lower surface of the other end of the third intake-side rocker arm 27.
  • each of the first and second exhaust-side rocker arms 28 and 29 has a tappet screw 46 provided at one end to abut against the upper end face of the valve rod 13 of the exhaust valve 11.
  • a slipper surface forming piece 47 is provided at the other end of the first exhaust-side rocker arm 28 to come into sliding contact with the raised portion 32, and further, a slipper surface forming piece 48 is provided at the other end of the second exhaust-side rocker arm 29 to come into sliding contact with the exhaust-side cam 33.
  • an intake valve operation characteristic changing means 49 is provided among the first, second and third intake-side rocker arms 25, 26 and 27.
  • the intake valve operation characteristic changing means 49 will be described below.
  • a first guide hole 50 is provided in the first intake-side rocker arm 25 in parallel to the rocker shaft 34, and opens toward the third intake-side rocker arm 27.
  • a first connecting pin 51 is slidably fitted in the first guide hole 50, and a hydraulic pressure chamber 52 is defined between a closed end of the first guide hole 50 and the first connecting pin 51.
  • An oil passage 53 is provided in the rocker shaft 34 to lead to a hydraulic pressure supply source (not shown) and normally communicate with the hydraulic pressure chamber 52 via through-holes 54 and 55.
  • a projection 56 is coaxially provided on one end face of the first connecting pin 51 and abuttable against the closed end of the first guide hole 50.
  • the length of the first connecting pin 51 is determined such that when the projection 56 has been put into abutment against the closed end of the first guide hole 50, the other end face is located at an open end of the first guide hole 50.
  • a guide hole 57 is provided through the third intake-side rocker arm 27.
  • the guide hole 57 is coaxial with the first guide hole 50 and has the same diameter as the first guide hole 50.
  • a second connecting pin 58 having the same length as the guide hole 57 is slidably fitted in the guide hole 57 and has the same diameter as the first connecting pin 51.
  • the second intake-side rocker arm 26 is provided with a bottomed and stepped second guide hole 59 which opens toward the third intake-side rocker arm 27 and lies coaxially with the guide hole 57.
  • a disk-like stopper 60 having the same diameter as the second connecting pin 58 is slidably fitted in a larger diameter portion 59a of the second guide hole 59, and has a shaft portion 61 coaxially and projectingly provided thereon and loosely inserted in a smaller-diameter portion 59b of the second guide hole 59.
  • a guide hole 62 is coaxially provided extending from a closed end of the second guide hole 59, and the shaft portion 61 is slidably inserted through the second guide hole 62.
  • a coiled return spring 63 is compressed between the stopper 60 and the closed end of the smaller-diameter portion 59b of the second guide hole 59 to surround the shaft portion 61, so that the stopper 60 and the first and second connecting pins 51 and 58 are biased toward the hydraulic pressure chamber 52 by a resilient force of the return spring 63.
  • an exhaust valve operation characteristic changing means 64 is provided between the first and second exhaust-side rocker arms 28 and 29.
  • the changing means 64 will be described below.
  • the second exhaust-side rocker arm 29 is provided with a guide hole 65 which opens toward the first exhaust-side rocker arm 28 and is parallel to the rocker shaft 35.
  • a connecting pin 66 is slidably fitted in the guide hole 65, and a hydraulic pressure chamber 67 is defined between the connecting pin 66 and a closed end of the guide hole 65.
  • An oil passage 68 is provided in the rocker shaft 35 to lead to the hydraulic pressure supply source (not shown) and is normally in communication with the hydraulic pressure chamber 67 by means of through-holes 69 and 70.
  • the connecting pin 66 has a projection 71 coaxially provided at one end face thereof which is abutted against the closed end of the guide hole 65.
  • the axial length of the connecting pin 66 is determined such that the other end face is located at an open end of the guide hole 65, when the projection 71 abuts against the closed end of the guide hole 65.
  • the first exhaust-side rocker arm 28 is provided with a bottomed and stepped guide hole 72 which opens toward the second exhaust-side rocker arm 29 and lies coaxially with the guide hole 65.
  • a disk-line stopper 73 having the same diameter as the connecting pin 66 is slidably fitted in a larger-diameter portion 72a of the guide hole 72, and has a shaft portion 74 coaxially and projectingly provided thereon and loosely fitted in a smaller-diameter portion 72b of the guide hole 72.
  • a smaller guide hole 75 is coaxially provided in a closed end of the guide hole 72, and the shaft portion 74 is slidably inserted through the smaller guide hole 75.
  • a coiled return spring 76 is compressed between the stopper 73 and the closed end of the smaller-diameter portion 72b to surround the shaft portion 74.
  • the stopper 73 and the connecting pin 66 are biased toward the hydraulic pressure chamber 67 by a resilient force of the return spring 76.
  • the swinging amount of the third intake-side rocker arm 27, in sliding contact with the first intake-side cam 30, is largest and hence, the first and second intake-side rocker arms 25 and 26 are also swung along with the third intake-side rocker arm 27 in accordance with the movement of the first intake-side cam 30.
  • the connecting pin 66 urges the stopper 73 against the resilient force of the return spring 76 and during this time, a portion of the connecting pin 66 is fitted into the guide hole 72.
  • the first and second exhaust-side rocker arms 28 and 29 are inhibited from relative swinging movement, but are swung in unison with each other in accordance with the movement of the exhaust-side cam 33.
  • both the intake valves 10 are opened and closed in accordance with the shape of the first intake-side cam 30, and both the exhaust valves are opened and closed in accordance with the shape of the exhaust-side cam 33.
  • the opening and closing mode, and thus the opening and closing timing and the lift amount for the intake valves 10 and the exhaust valves 11, can be varied in correspondence with the low-speed and high-speed operating ranges, respectively, thereby providing a reduction in specific fuel consumption and an increase in engine output.
  • Fig.6 illustrates the first intake-side rocker arm 25.
  • the first intake-side rocker arm 25 includes a rocker arm body 77 and the slipper surface forming piece 41 affixed to the rocker body 77.
  • the rocker arm body 77 has the support hole (shaft insertion hole) 36 through which the rocker shaft 34 is rotatably inserted, the first guide hole (shaft insertion hole) 50 into which the first connecting pin 51 is slidably fitted, and a female threaded bore 78 into which the tappet screw 43 is threadedly engaged.
  • the support hole 36 and the first guide hole 50 may be subjected to burnishing prior to the nitriding treatment.
  • Table 1 shows the composition of the nitrided steel used in each of examples 1 to 3 and comparative examples 1 and 2.
  • hardening conditions included a treating temperature (T 1 ) of 910° C and a treating time (t 1 ) of 1 hour, and oil-cooling was used.
  • Tempering conditions included a treating temperature (T 2 ) of 690° C and a treating time (t 2 ) of 2 hours.
  • the nitriding treatment used was a gas, soft nitriding treatment.
  • a gas mixture consisting of 50 % of halogen gas and 50 % of cracked ammonia gas was used; the treating temperature (T 3 ) was set at 570° C, and the treating time (t 3 ) was set at 5 hours.
  • the strength at yield point was measured. Further, the hardness and wear amount were measured for the opening edge 80 (see Figs.3 and 5) of the first guide hole 50 which requires a strict wear-resistance against collision with the second connection pin 58 during shifting of the second connecting pin 58. In measuring the wear amount of the opening edge 80, the engine was run at 5,000 rpm and the lift load of the valve spring 20 was set at 32 kg.
  • the second connection pin 58 was shifted from the low speed side to the high speed side where the pin 58 was retained for 0.5 seconds, then the pin 58 was shifted from the high speed side to the low speed side where the pin 58 was retained for 0.5 seconds.
  • Such reciprocal shifting of the pin 58 was repeated continuously on this schedule for 400,000 cycles. Thereafter, the amount of wear on the opening edge 80 was measured.
  • the first intake-side rocker arm 25 in each of examples 1 to 3 had an excellent strength at yield point and showed a smaller wear amount at the opening edge 80 of the first guide hole 50 and hence, had excellent mechanical characteristics. Further, as compared with the rocker arm of comparative examples 1 and 2, the first intake-side rocker arm 25 in example 3 had an increased hardness because of the Mo contained therein. The amounts of wear of the inner surfaces of the first guide hole 50 and the support hole 36 were extremely small, because the sliding conditions were quite moderated, as compared with the opening edge 80.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Heat Treatment Of Articles (AREA)
  • Valve Device For Special Equipments (AREA)

Claims (1)

  1. Procédé pour produire un levier oscillant pour un moteur à combustion interne, comprenant les étapes consistant à :
    fabriquer une ébauche brute de levier oscillant (79) qui présente une ouverture (36a) adaptée à une transformation en trou d'insertion d'axe et qui est faite en un acier comprenant de 0,3 % à 0,5 % en poids de carbone, de 0,3 % à 1,5 % en poids de manganèse, de 0,9 % à 1,5 % en poids de chrome, de 0,7 % à 1,5 % en poids d'aluminium, 0,35 % en poids ou moins de silicium, 0,03 % en poids ou moins de phosphore, 0,03 % en poids ou moins de soufre, 0,3 % en poids ou moins de cuivre, 0,25 % en poids ou moins de nickel, le cas échéant de 0,15 % à 0,3 % en poids de molybdène, acier comprenant de 0,04 % à 0,15 % en poids de plomb, de 0,03 % à 0,1 % en poids de bismuth et sensiblement équilibré en fer ;
    affiner ladite ébauche brute de levier oscillant par :
    trempe à une température de traitement (T1) de 850 à 950°C pendant une durée de traitement (t1) de 0,5 à 2 heures, et
    revenu à une température de traitement (T2) de 600 à 700°C pendant une durée de traitement (t2) de 0,5 à 2 heures ;
    aléser ladite ouverture d'une valeur suffisante pour former ledit trou d'insertion d'axe ; et
    nitrurer ladite ébauche de levier oscillant alésée à une température de traitement (T3) de 550 à 610°C pendant une durée de traitement (t3) de 5 à 8 heures.
EP94309203A 1993-10-05 1994-12-09 Procédé pour la fabrication de leviers oscillants Expired - Lifetime EP0718410B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP24959593A JP3411637B2 (ja) 1993-10-05 1993-10-05 内燃機関用ロッカアームの製造方法
EP94309203A EP0718410B1 (fr) 1993-10-05 1994-12-09 Procédé pour la fabrication de leviers oscillants
DE1994626982 DE69426982T2 (de) 1994-12-09 1994-12-09 Verfahren zum Herstellen von Kipphebeln

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP24959593A JP3411637B2 (ja) 1993-10-05 1993-10-05 内燃機関用ロッカアームの製造方法
EP94309203A EP0718410B1 (fr) 1993-10-05 1994-12-09 Procédé pour la fabrication de leviers oscillants

Publications (2)

Publication Number Publication Date
EP0718410A1 EP0718410A1 (fr) 1996-06-26
EP0718410B1 true EP0718410B1 (fr) 2001-03-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP94309203A Expired - Lifetime EP0718410B1 (fr) 1993-10-05 1994-12-09 Procédé pour la fabrication de leviers oscillants

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JP (1) JP3411637B2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10209264B4 (de) * 2002-03-01 2005-06-02 Ab Skf Verfahren zum Herstellen eines Bauteils aus Metall
CN111558651B (zh) * 2020-05-13 2021-09-14 上海长特锻造有限公司 三臂工件生产工艺及使用此工艺生产的工件

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1649398A (en) * 1925-05-14 1927-11-15 Krupp Ag Steel alloy
CH149752A (de) * 1929-09-30 1931-09-30 Aubert & Duval Freres Durch Versticken härtbare Stahl- und Gusseisenlegierung.
DE1199006B (de) * 1960-07-16 1965-08-19 Degussa Verwendung von bekannten Automatenstaehlen als Werkstoff fuer Getrieberaeder, insbesondere fuer Kraftfahrzeuggetriebe, und Verfahren zu deren Waermebehandlung
JPS5341611B2 (fr) * 1972-06-30 1978-11-06
JPS63166947A (ja) * 1986-12-27 1988-07-11 Sumitomo Metal Ind Ltd 窒化鋼
DE4205647C2 (de) * 1992-02-25 1996-08-01 Schaeffler Waelzlager Kg Verfahren zur thermochemisch-thermischen Behandlung von Einsatzstählen

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JP3411637B2 (ja) 2003-06-03
JPH07102322A (ja) 1995-04-18
EP0718410A1 (fr) 1996-06-26

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