EP1516107B1 - Fixation d'un tourillon - Google Patents

Fixation d'un tourillon Download PDF

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Publication number
EP1516107B1
EP1516107B1 EP03761465A EP03761465A EP1516107B1 EP 1516107 B1 EP1516107 B1 EP 1516107B1 EP 03761465 A EP03761465 A EP 03761465A EP 03761465 A EP03761465 A EP 03761465A EP 1516107 B1 EP1516107 B1 EP 1516107B1
Authority
EP
European Patent Office
Prior art keywords
pin
hardness
bolt
hrc
peripheral surface
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
EP03761465A
Other languages
German (de)
English (en)
Other versions
EP1516107A1 (fr
Inventor
Joseph Griffin
Marion Ince
Charles Schwab
Eric Nelson
Richard Carpenter
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
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 Schaeffler KG filed Critical Schaeffler KG
Publication of EP1516107A1 publication Critical patent/EP1516107A1/fr
Application granted granted Critical
Publication of EP1516107B1 publication Critical patent/EP1516107B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

Definitions

  • the invention relates to a bearing pin in a receiving bore of a housing which can be caulked to achieve a force and / or positive connection at least at one end with the bore end, wherein the bolt has a lateral surface with a hardness greater than the hardness of its front ends is.
  • Such a bolt for supporting the acted upon by a cam roller of a rocker arm is out of US 5,054,440 or JP-A-62007908 previously known.
  • This rocker arm has a fork-shaped portion whose two cheeks each have a receiving bore through which the bearing pin is guided. He carries a roller mounted on needles, which is acted upon by a cam.
  • the bolt is held in the receiving bore by caulking, that is, it is acted upon at one or both end faces with a corresponding tool, so that a portion of its material is displaced in the radial direction in the receiving bore.
  • the object of the invention is therefore to develop a bearing pin, which has a long life even under high load conditions.
  • this object is achieved by the characterizing part of claim 1 in conjunction with the preamble thereof in that the entire bolt is carbonitrided, quenched and tempered, so that a hardness of HV 745-950 (HRC 62-68) is realized, then the thus treated bolts to set a hardness of HV 212-305 (HRB 93-HRC 30) is annealed before the shell surface is subjected to induction hardening to set a final hardness of HV 745-950 (HRC 62-68).
  • the advantage of such a bolt produced in accordance with the invention is that there is an increased hardness and a higher residual compressive stress in the raceway area, so that the bolt has an increased wear and fatigue strength at the same time soft front ends in this area.
  • Carbonitriding is known to those skilled in the art as a thermochemical process for treating a workpiece in the austenitic state with the purpose of enriching the surface layer with carbon and nitrogen, both of which are then in solid solution in austenite. Following this treatment, quenching takes place immediately the goal of achieving a cure.
  • carbonitriding realizes a specific layer structure in the form of a bonding layer and an underlying diffusion layer. While the bonding layer governs all the work-piece properties associated with the immediate surface impact, ie, wear behavior and corrosion resistance, the mechanical properties of the workpieces, which relate to fatigue strength and tensile strength, are determined by the diffusion layer.
  • soft annealing the carbonitrided, quenched and tempered pin for setting the hardness values HV 212-305 (HRB 93-HRC 30), which are the hardness values for the two end faces of the pin.
  • This soft annealing serves, in particular, to improve the ability to change the shape of the bolt so that it can easily be plastically deformed in its end regions and thus can be clamped in a simple manner to a receiving bore.
  • the annealing temperatures depend on the particular material used and are between 650 and 700 ° C for steel.
  • the purpose of soft annealing is ultimately to give the steel a suitable structure for curing and to convert it into a soft, easily workable state.
  • Induction hardening is currently the most widely used thermal surface hardening method.
  • a current-carrying coil inductor
  • an alternating magnetic field generated, which induces an alternating current in an electrically conductive workpiece (bolt) according to the transformer principle.
  • the direct conversion of the electrical into thermal energy via internal heat sources thus leads to heating of the component, wherein the energy transfer takes place without contact.
  • the heating is limited mainly to the surface layer in which the internal heat sources are effective.
  • heat conduction occurs as a result of radially advancing heating of the component. It follows that the hardening depth can be adjusted by simple means and always adaptable to the respective application without great effort.
  • the bolt should be solid or at least in the section of its front-side hollow cylindrical.
  • rocker arm 1 of a valve train of an internal combustion engine is pivotally mounted about its axis 2.
  • rocker arm 1 At its right end portion of the rocker arm 1 is in operative connection with the shaft of the gas exchange valve 3, which is held by the associated spring 4 in the closed position.
  • the roller 5 At its left-side end, the roller 5 is held in the rocker arm 1 via the bolt 6, which is in contact with the cam 7.
  • a pivoting movement of the rocker arm 1 about its axis 2 is triggered such that its left-hand part is moved upwards and its right-hand part is moved downwards, the gas exchange valve 3 opening.
  • the rocker arm 1 at its left-hand end a fork-shaped part with the spaced apart cheeks 1.1, 1.2.
  • these cheeks 1.1, 1.2 extends the aligned hole 1.3, in which the bolt 6 is arranged, which carries the roller 5 mounted on the WälzSystemkranz.
  • the bolt 6 forms the inner race 6.1 for the WälzSystemkranz 8 and is caulked at its two end faces 6.2 in the receiving bore 1.3 of the cheeks 1.1, 1.2 of the rocker arm 1.
  • By applying an axial force is material of the bolt 6 in the direction of the cheeks 1.1, 1.2 pressed, so that a positive connection between the bolt 6 and rocker arm 1 is formed. From the above figure it can be seen that the bearing pin 6 on the one hand must be soft on its end faces 6.2 in order to be caulked and on the other hand in the raceway area 6.1 must have sufficient hardness to act as a resilient radial bearing can.
  • Such a 17 MnCr5 steel stud that is, 0.17% carbon and 1.25% manganese and chromium each, is carbonitrided in a gas mixture, then quenched and tempered in an oil bath.
  • internal stresses are reduced, that is, hardness and strength decrease, while the toughness increases.
  • brittle tetragonal martensite changes into tougher cubic martensite.
  • the bolt After tempering, the bolt has a hardness of HV 800. Subsequently, it is subjected to soft annealing, wherein one understands a long-term heating of the steel to temperatures close to the A1 point followed by slow cooling.
  • the purpose of soft annealing is to give the steel, on the one hand, a structure suitable for hardening and, on the other hand, to convert it into a soft, readily processable state.
  • the bolt After soft annealing, the bolt has a hardness of HV 250, this hardness being the final hardness for both end faces 6.2 at the same time.
  • a partial induction hardening of the lateral surface of the bolt 6 so that it has a final hardness of HV 800.
  • This region 6.3 contains the structure described in claim 2 after induction hardening, that is, finely divided spherical carbides in a matrix of tempered martensite having a residual austenite content of 5-25%.
  • the transition region 6.4 of the bolt 6 separates the hardened region 6.3 from the soft end faces 6.2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Articles (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Rolling Contact Bearings (AREA)

Claims (5)

  1. Goujon de montage (6) placé dans un alésage de réception (1.3) d'un boîtier et dont au moins une extrémité peut être matée frontalement avec l'alésage (1.3) pour obtenir une correspondance mécanique et/ou géométrique, le goujon (6) présentant une surface d'enveloppe dont la dureté est supérieure à la dureté de ses extrémités frontales (6.2),
    caractérisé en ce que
    l'ensemble du goujon (6) est carbo-nitruré, trempé et revenu de manière à obtenir une dureté HV de 745 à 950 (dureté HRC de 62 à 68),
    le goujon (6) ainsi traité subissant ensuite un recuit d'adoucissement pour établir une dureté HV de 212 à 305 (HRB 93- HRC 30) avant que la surface d'enveloppe subisse un durcissement par induction de manière à établir une dureté finale HV de 745 à 950 (HRC 62 à 68) .
  2. Goujon (6) selon la revendication 1, caractérisé en ce qu'après le chauffage par induction, la surface d'enveloppe présente des carbures sphériques finement répartis dans une matrice de martensite revenue dont la teneur résiduelle en austénite est de 5 à 25 %.
  3. Goujon (6) selon la revendication 1, caractérisé en ce qu'il est plein ou cylindrique creux au moins dans la partie formée par ses extrémités frontales.
  4. Goujon (6) selon la revendication 1, caractérisé en ce qu'il est utilisé pour monter un galet (5) d'un levier d'actionnement (1) d'un entraînement de soupape d'un moteur à combustion interne.
  5. Goujon (6) selon la revendication 1, caractérisé en ce qu'il est utilisé pour monter une roue planétaire d'une boîte de vitesses à roues dentées pour véhicule automobile.
EP03761465A 2002-06-27 2003-06-12 Fixation d'un tourillon Expired - Lifetime EP1516107B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US39181802P 2002-06-27 2002-06-27
US391818P 2002-06-27
PCT/EP2003/006277 WO2004003349A1 (fr) 2002-06-27 2003-06-12 Fixation d'un tourillon

Publications (2)

Publication Number Publication Date
EP1516107A1 EP1516107A1 (fr) 2005-03-23
EP1516107B1 true EP1516107B1 (fr) 2009-01-14

Family

ID=29780526

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03761465A Expired - Lifetime EP1516107B1 (fr) 2002-06-27 2003-06-12 Fixation d'un tourillon

Country Status (8)

Country Link
US (1) US7377988B2 (fr)
EP (1) EP1516107B1 (fr)
KR (1) KR100927568B1 (fr)
CN (1) CN100359138C (fr)
AU (1) AU2003242704A1 (fr)
DE (2) DE10315416A1 (fr)
PL (1) PL202382B1 (fr)
WO (1) WO2004003349A1 (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2345822B1 (fr) * 2004-08-02 2019-01-09 NTN Corporation Roulement pour culbuteur et culbuteur
US7563064B2 (en) * 2005-12-06 2009-07-21 Blount, Inc. Shear resistant rivet and saw chain
US7891279B2 (en) * 2005-12-06 2011-02-22 Blout, Inc. Shear resistant rivet and saw chain
DE102006054406B4 (de) * 2006-11-18 2016-09-15 Schaeffler Technologies AG & Co. KG Hubübertragungsbauteil und Verfahren zu dessen Herstellung
US20090173301A1 (en) * 2008-01-09 2009-07-09 Roller Bearing Company Of America, Inc Surface treated rocker arm shaft
DE102008017023A1 (de) * 2008-04-03 2009-10-08 Schaeffler Kg Bauteil für eine mit Alkoholkraftstoff betriebene Brennkraftmaschine
BR112012026018A2 (pt) * 2010-04-22 2016-06-28 Taiho Kogyo Co Ltd aparelho de mancal
DE102011103689A1 (de) * 2010-06-29 2011-12-29 Schaeffler Technologies Gmbh & Co. Kg Niet und Verfahren zum Vernieten von Bauteilen
DE102011004630A1 (de) * 2011-02-24 2012-08-30 Schaeffler Technologies Gmbh & Co. Kg Wälzkörper
DE102012205242A1 (de) 2012-03-30 2013-10-02 Schaeffler Technologies AG & Co. KG Wälzlagerbauteil
CN104995429A (zh) * 2013-02-27 2015-10-21 舍弗勒技术股份两合公司 行星小齿轮轴
DE102015204421A1 (de) * 2015-03-12 2016-04-21 Schaeffler Technologies AG & Co. KG Lagerbolzen für einen Nockenfolger für einen Ventiltrieb einer Brennkraftmaschine und Verfahren zur Herstellung eines Lagerbolzens
EP3181838B1 (fr) * 2015-12-16 2019-10-23 Aktiebolaget SKF Procédé de fabrication d'une broche pour dispositif de galet à contre-came
US10077484B2 (en) 2016-10-28 2018-09-18 Schaeffler Technologies AG & Co. KG Method for producing a planetary gear shaft having increased hardness
DE102017119964A1 (de) * 2017-08-31 2019-02-28 Schaeffler Technologies AG & Co. KG Lagervorrichtung, Planetengetriebe mit einer Lagervorrichtung und Verfahren zur Herstellung und Montage eines Planetenbolzens
DE102017119965A1 (de) * 2017-08-31 2018-11-15 Schaeffler Technologies AG & Co. KG Lagervorrichtung
CN114198407B (zh) * 2021-12-15 2022-09-16 奇瑞汽车股份有限公司 发动机的轴承下盖和加工工艺方法、发动机

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FR2241624A1 (en) * 1973-07-13 1975-03-21 Int Nickel Ltd Fabrication of articles in chromium steels - using spheroidised structure and formation of martensite after deformation
SE446646B (sv) * 1981-12-15 1986-09-29 Santrade Ltd Bergborrkrona och sett att tillverka denna
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Also Published As

Publication number Publication date
EP1516107A1 (fr) 2005-03-23
AU2003242704A1 (en) 2004-01-19
KR100927568B1 (ko) 2009-11-23
US20040000280A1 (en) 2004-01-01
CN100359138C (zh) 2008-01-02
CN1662729A (zh) 2005-08-31
PL372840A1 (en) 2005-08-08
US7377988B2 (en) 2008-05-27
KR20050014008A (ko) 2005-02-05
DE10315416A1 (de) 2004-01-22
PL202382B1 (pl) 2009-06-30
WO2004003349A1 (fr) 2004-01-08
DE50311093D1 (de) 2009-03-05

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