EP1609960A1 - Suiveur de came du type a levier - Google Patents

Suiveur de came du type a levier Download PDF

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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
Application number
EP05010811A
Other languages
German (de)
English (en)
Other versions
EP1609960B1 (fr
Inventor
Helmut Engelhardt
Ernst Ammon
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.)
IHO Holding GmbH and Co KG
Original Assignee
INA Schaeffler KG
Schaeffler KG
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
Application filed by INA Schaeffler KG, Schaeffler KG filed Critical INA Schaeffler KG
Publication of EP1609960A1 publication Critical patent/EP1609960A1/fr
Application granted granted Critical
Publication of EP1609960B1 publication Critical patent/EP1609960B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Heat Treatment Of Articles (AREA)
EP05010811A 2004-06-12 2005-05-19 Suiveur de came du type a levier Expired - Fee Related EP1609960B1 (fr)

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 (fr) 2005-12-28
EP1609960B1 EP1609960B1 (fr) 2007-03-14

Family

ID=34936664

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05010811A Expired - Fee Related EP1609960B1 (fr) 2004-06-12 2005-05-19 Suiveur de came du type a levier

Country Status (4)

Country Link
US (1) US8328959B2 (fr)
EP (1) EP1609960B1 (fr)
JP (1) JP2006046325A (fr)
DE (2) DE102004028667A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011003865A1 (fr) * 2009-07-08 2011-01-13 Schaeffler Technologies Gmbh & Co. Kg Procédé de fabrication d'un composant de transmission de course
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)

* Cited by examiner, † Cited by third party
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
EP2971624B1 (fr) 2013-03-15 2018-03-14 Roller Bearing Company of America, Inc. Suiveur de came à rouleau monté sur roulement à aiguilles pour utilisation à kilométrage élevé de véhicules du type poids lourds, moyens ou légers

Citations (4)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011003865A1 (fr) * 2009-07-08 2011-01-13 Schaeffler Technologies Gmbh & Co. Kg Procédé de fabrication d'un composant de transmission de course
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
JP2006046325A (ja) 2006-02-16
EP1609960B1 (fr) 2007-03-14
DE102004028667A1 (de) 2005-12-29
US8328959B2 (en) 2012-12-11
DE502005000466D1 (de) 2007-04-26
US20050274437A1 (en) 2005-12-15

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