EP1609960A1 - Hebelartiger Nockenfolger - Google Patents
Hebelartiger Nockenfolger Download PDFInfo
- Publication number
- EP1609960A1 EP1609960A1 EP05010811A EP05010811A EP1609960A1 EP 1609960 A1 EP1609960 A1 EP 1609960A1 EP 05010811 A EP05010811 A EP 05010811A EP 05010811 A EP05010811 A EP 05010811A EP 1609960 A1 EP1609960 A1 EP 1609960A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cam follower
- lever
- steel
- hardness
- hardening
- 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.)
- Granted
Links
Images
Classifications
-
- 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
- F01L1/185—Overhead end-pivot rocking arms
Definitions
- the invention relates to a non-cutting produced from a steel sheet lever-like Cam follower for a valve train of an internal combustion engine for acting at least one gas exchange valve.
- valve drive mechanism In an automotive internal combustion engine is a valve drive mechanism to drive intake valves and exhaust valves in synchronism with the engine revolution available.
- the valve drive mechanism generally includes a camshaft and a cam follower, the rotational movement of the camshaft in a reciprocating motion to the inlet and inlet axial drive Exhaust valves converted.
- the cam follower comprises a rocker arm of the Cam is driven, which are supported by the camshaft.
- case hardening consists of carburizing or carbonitriding with subsequent hardening either immediately afterwards or after an intermediate cooling and reheating to a suitable hardening temperature. Depending on the required Use properties or the requirements of the following Processing is tempered after hardening or deep-frozen and tempered. Case hardening serves the edge layer of workpieces made of steel a much higher hardness and the workpiece better mechanical To give properties. For this purpose, the surface layer before curing with carbon (carburizing) or carbon and nitrogen (carbonitriding) enriched. The additional nitrogen enrichment causes compared to the Carburizing by changing the conversion behavior in the surface layer a higher hardenability and a higher tempering resistance after hardening.
- the lever-type cam followers produced in this way has the disadvantage that the corresponding heat treatment of the insert material very time consuming and expensive.
- the invention is therefore based on the object, the production costs for a Lever-like cam follower made of sheet metal decisively to reduce.
- this object is achieved by the characterizing part of Claim 1 in conjunction with the preamble solved by a cold-workable hardenable tempering steel is used.
- the core hardness has a value of ⁇ 600 HV and an edge hardness ⁇ 680 HV having the core hardness in the range between 600 and 650 HV and marginal hardness in the range between 680 and 700 HV.
- lever-like cam follower made of a tempering steel brand C45M with 0.39-0.46% C, 0.15% Si, 0.55-0.70% Mn, 0.020% P, 0.07% S, 0.25-0.40% Cr, 0.020 - 0.060% Al, 0.0040 - 0.0100% N 2 , 0.10 - 0.20% Ni, 0.05 - 0.10% Mo, to 0.005% Sn, to 0.002% Sb, total Cu, Ni , Mn, Cr 1.00 to 1.45% is used.
- This cold formable hardenable steel is an isotropic fine grain steel with high purity. Its thermoformability and formability is comparable to previously used cold-rolled materials, in its hardenability, however, he is significantly above conventional steels. He is due to its high core hardness higher statically and dynamically loadable than parts made of conventional steel. This reduces plastic deformation in places of high static load.
- Figures 1 and 2 show an example of a cam follower 1 in the form of a Toggle lever, which is made of a sheet material and a finger-like Has geometry. Between its parallel side walls 2 a runs Crossbar 3, which connects the two side walls 2 with each other, so that a U-shaped profile is formed, which encloses the gap 4. At a side facing away from the gap 4 bottom 5 is in the range of the end 6 an unillustrated shank end of a gas exchange valve at. This is mounted between two webs 7, which also at the bottom 5 lost.
- the side walls 2 have two mutually aligned recesses 8, in which the axis 9 is inserted. On this axis 9 is about the rolling bearing 10, the roller 11 stored.
- roller 11 With the roller 11 is an unrepresented Cam of a camshaft in operative connection.
- the cam follower 1 In the area of another end 12 is the cam follower 1 on a head of a supporting element, not shown stored, wherein both parts by the holding member 13 with each other are connected.
- the webs 7 extend integrally as an extension the side walls 2 and 180 ° in the region of the end 6 to the underside 5 bent.
- the cam follower 1 is in the region of the end 6 in his Width reduced.
- Such a cam follower 1 is produced without cutting from a 3.5 mm thick strip of the tempered steel C45M with the following chemical composition: 0.42 - 0.46% C, to 0.15% Si, 0.60 - 0.70% Mn, to 0.020% P, to 0.07% S, 0.30 - 0.40% Cr, 0.020 0.060% Al, 0.0040-0.0100% N 2 , 0.10-0.20% Ni, 0.05-0.10% Mo, to 0.005% Sn, to 0.002% Sb, to 0.15 % Cu, sum of Cu, Ni, Mn, Cr 1.05 to 1.45%.
- a steel C45M according to the invention follows its heat treatment unlike a conventional steel of the Brand DC04M only a flat towards the middle of the belt sloping hardness curve on. While the edge hardness is to be set with about 750 HV, the core hardness decreases a value of about 650 HV. Due to this optimized hardenability, the to vote on the component geometry and the load, this points Steel has a high core hardness, toughness and elasticity. This high core hardness The cold - workable, hardenable steel ultimately ensures that the the savings described above, such as reducing the wall cross-section, Increasing the strength and reducing the total weight possible are.
- a cam follower 1 made of case hardening steel C16M is a classic according to FIG Case hardened, with the lever 1 120 min at a Temperature of 880 ° C is maintained. After that, the part will open Quenched room temperature and then left for 120 min. This is to be understood as meaning a heat treatment that is cured and hardened relatively brittle material state should give a higher toughness. She consists in heating to temperatures in the range of 160 - 650 ° sufficient holding time and cooling again to room temperature. By duration and cooling again to room temperature. By starting it will the hardness decreases, the strength decreases and the ductility and the Toughness is increasing. Case hardening therefore creates a quasi-material composite, wherein the edge provided with the maximum achievable hardness is and the core is much softer.
- cam follower 1 is made of tempered steel C45M, so it is first hardened slightly carburizing, where it is 30 min at 840 ° C. to hold. This is followed by quenching to room temperature and a tempering, which also extends to 120 minutes. It is clear that in the first case, the actual hardening process during case hardening 120 min and in the second case only 30 minutes, so that during the actual hardening process a time saving of 75% can be realized. It is further from Advantage that even hardening at a lower by 40 ° C temperature possible is what means a significant energy saving.
Abstract
Description
0,39 - 0,46% C, bis 0,15 % Si, 0,55 - 0,70 % Mn, bis 0,020 % P, bis 0,07 % S, 0,25 - 0,40 % Cr, 0,020 - 0,060 % Al, 0,0040 - 0,0100 % N2, 0,10 - 0,20 % Ni, 0,05 - 0,10 % Mo, bis 0,005 % Sn, bis 0,002 % Sb, Summe Cu, Ni, Mn, Cr 1,00 bis 1,45 %
verwendet ist.
- Figur 1
- einen Längsschnitt durch einen Nockenfolger,
- Figur 2
- eine Draufsicht auf den Nockenfolger gemäß Figur 1,
- Figur 3
- einen Härtevergleich zwischen einem klassischen Stahl und einem erfindungsgemäßen Stahl und
- Figur 4
- eine Wärmebehandlung von klassischem Stahl und dem erfindungsgemäßen Stahl.
0,42 - 0,46 % C, bis 0,15 % Si, 0,60 - 0,70 % Mn, bis 0,020 % P, bis 0,07 % S, 0,30 - 0,40 % Cr, 0,020 - 0,060 % Al, 0,0040 - 0,0100 % N2, 0,10 - 0,20 % Ni, 0,05 - 0,10 % Mo, bis 0,005 % Sn, bis 0,002 % Sb, bis 0,15 % Cu, Summe Cu, Ni, Mn, Cr 1,05 bis 1,45 %.
- 1
- Nockenfolger
- 2
- Seitenwand
- 3
- Querbalken
- 4
- Zwischenraum
- 5
- Unterseite
- 6
- Ende
- 7
- Steg
- 8
- Aussparung
- 9
- Achse
- 10
- Wälzlager
- 11
- Rolle
- 12
- Ende
- 13
- Halteelement
Claims (4)
- Spanlos aus einem Stahlblech hergestellter hebelartiger Nockenfolger (1) für einen Ventiltrieb einer Brennkraftmaschine zur Beaufschlagung wenigstens eines Gaswechselventils, dadurch gekennzeichnet, dass ein kaltumformbarer durchhärtbarer Vergütungsstahl verwendet ist.
- Hebelartiger Nockenfolger (1) nach Anspruch 1, dadurch gekennzeichnet, dass dieser eine Kernhärte von größer gleich 600 HV und eine Randhärte von größer gleich 680 HV aufweist.
- Hebelartiger Nockenfolger (1) nach Anspruch 2, dadurch gekennzeichnet, dass die Kernhärte einen Wert von 600 - 650 HV und die Randhärte einen Wert von 680 - 750 HV aufweist.
- Hebelartiger Nockenfolger (1) nach Anspruch 1, dadurch gekennzeichnet, dass ein Vergütungsstahl der Marke C45M
mit 0,39 - 0,46% C, bis 0,15 % Si, 0,55-0,70 % Mn, bis 0,020 % P, bis 0,07 % S, 0,25 - 0,40 % Cr, 0,020 - 0,060 % Al, 0,0040 - 0,0100 % N2, 0,10 - 0,20 % Ni, 0,05 - 0,10 % Mo, bis 0,005 % Sn, bis 0,002 % Sb, bis 0,15 % Cu, Summe Cu, Ni, Mn, Cr 1,00 bis 1,45 %
verwendet ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004028667A DE102004028667A1 (de) | 2004-06-12 | 2004-06-12 | Hebelartiger Nockenfolger |
DE102004028667 | 2004-06-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1609960A1 true EP1609960A1 (de) | 2005-12-28 |
EP1609960B1 EP1609960B1 (de) | 2007-03-14 |
Family
ID=34936664
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05010811A Expired - Fee Related EP1609960B1 (de) | 2004-06-12 | 2005-05-19 | Hebelartiger Nockenfolger |
Country Status (4)
Country | Link |
---|---|
US (1) | US8328959B2 (de) |
EP (1) | EP1609960B1 (de) |
JP (1) | JP2006046325A (de) |
DE (2) | DE102004028667A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011003865A1 (de) * | 2009-07-08 | 2011-01-13 | Schaeffler Technologies Gmbh & Co. Kg | Verfahren zur herstellung eines hubübertragungsbauteils |
CN103667955A (zh) * | 2013-12-20 | 2014-03-26 | 齐齐哈尔轨道交通装备有限责任公司 | 一种高冲击强度钢及其铸件 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006002994A1 (de) * | 2006-01-21 | 2007-08-02 | Schaeffler Kg | Hebelartiger Nockenfolger |
US7836860B2 (en) | 2007-11-21 | 2010-11-23 | Charter Manufacturing Co., Inc. | Engine rocker arm |
JP5164545B2 (ja) | 2007-12-07 | 2013-03-21 | 株式会社オティックス | 動弁装置及びロッカアームユニット |
JP5517915B2 (ja) * | 2010-12-28 | 2014-06-11 | 株式会社オティックス | ロッカアームユニット |
DE102011089396A1 (de) | 2011-12-21 | 2013-06-27 | Schaeffler Technologies AG & Co. KG | Schlepphebel für ein Gaswechselventil einer Brennkraftmaschine |
WO2014143817A1 (en) | 2013-03-15 | 2014-09-18 | Roller Bearing Company Of America, Inc. | Needle roller cam follower for higher mileage applications of light, medium and heavy duty vehicles |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4829647A (en) * | 1987-12-14 | 1989-05-16 | Ford Motor Company | Method of making low friction finger follower rocker arms |
US4969957A (en) * | 1988-08-27 | 1990-11-13 | Mazda Motor Corporation | Method of producing a mechanical component with superior fatigue strength |
US6003482A (en) * | 1996-08-05 | 1999-12-21 | Motorenfabrik Hatz Gmbh & Co. Kg | Rocker arm for an internal combustion engine |
US20030106514A1 (en) * | 1998-03-12 | 2003-06-12 | Nsk Ltd. | Sheet metal rocker arm, manufacturing method thereof, cam follower with said rocker arm, and assembling method thereof |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3909902B2 (ja) * | 1996-12-17 | 2007-04-25 | 株式会社小松製作所 | 高耐面圧用鋼部品およびその製造方法 |
US5819694A (en) * | 1997-05-15 | 1998-10-13 | Welles Manufacturing Company | Stamped roller-type cam followers with added height |
JP2000054810A (ja) * | 1998-08-07 | 2000-02-22 | Nippon Seiko Kk | 板金製ロッカーアームを備えたカムフォロア |
DE10020118B4 (de) * | 2000-04-22 | 2009-11-12 | Schaeffler Kg | Wälzlagerbauteil |
JP2003206708A (ja) * | 2002-01-16 | 2003-07-25 | Ntn Corp | ローラ付きカムフォロア |
-
2004
- 2004-06-12 DE DE102004028667A patent/DE102004028667A1/de not_active Withdrawn
-
2005
- 2005-05-19 EP EP05010811A patent/EP1609960B1/de not_active Expired - Fee Related
- 2005-05-19 DE DE502005000466T patent/DE502005000466D1/de active Active
- 2005-06-02 US US11/143,254 patent/US8328959B2/en not_active Expired - Fee Related
- 2005-06-10 JP JP2005170702A patent/JP2006046325A/ja active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4829647A (en) * | 1987-12-14 | 1989-05-16 | Ford Motor Company | Method of making low friction finger follower rocker arms |
US4969957A (en) * | 1988-08-27 | 1990-11-13 | Mazda Motor Corporation | Method of producing a mechanical component with superior fatigue strength |
US6003482A (en) * | 1996-08-05 | 1999-12-21 | Motorenfabrik Hatz Gmbh & Co. Kg | Rocker arm for an internal combustion engine |
US20030106514A1 (en) * | 1998-03-12 | 2003-06-12 | Nsk Ltd. | Sheet metal rocker arm, manufacturing method thereof, cam follower with said rocker arm, and assembling method thereof |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011003865A1 (de) * | 2009-07-08 | 2011-01-13 | Schaeffler Technologies Gmbh & Co. Kg | Verfahren zur herstellung eines hubübertragungsbauteils |
CN102421994A (zh) * | 2009-07-08 | 2012-04-18 | 谢夫勒科技有限两合公司 | 升程传递部件的制造方法 |
US8590149B2 (en) | 2009-07-08 | 2013-11-26 | Schaeffler Technologies AG & Co. KG | Method of manufacturing a lift transmitting component |
CN102421994B (zh) * | 2009-07-08 | 2014-07-02 | 谢夫勒科技股份两合公司 | 升程传递部件的制造方法 |
CN103667955A (zh) * | 2013-12-20 | 2014-03-26 | 齐齐哈尔轨道交通装备有限责任公司 | 一种高冲击强度钢及其铸件 |
CN103667955B (zh) * | 2013-12-20 | 2016-02-17 | 齐齐哈尔轨道交通装备有限责任公司 | 一种高冲击强度钢及其铸件 |
Also Published As
Publication number | Publication date |
---|---|
US20050274437A1 (en) | 2005-12-15 |
DE502005000466D1 (de) | 2007-04-26 |
JP2006046325A (ja) | 2006-02-16 |
US8328959B2 (en) | 2012-12-11 |
EP1609960B1 (de) | 2007-03-14 |
DE102004028667A1 (de) | 2005-12-29 |
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