WO1998019053A1 - Culbuteur ou basculeur pour mecanisme de distribution d'un moteur a combustion interne - Google Patents

Culbuteur ou basculeur pour mecanisme de distribution d'un moteur a combustion interne Download PDF

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Publication number
WO1998019053A1
WO1998019053A1 PCT/EP1997/004370 EP9704370W WO9819053A1 WO 1998019053 A1 WO1998019053 A1 WO 1998019053A1 EP 9704370 W EP9704370 W EP 9704370W WO 9819053 A1 WO9819053 A1 WO 9819053A1
Authority
WO
WIPO (PCT)
Prior art keywords
rocker arm
support element
rocker
combustion engine
internal combustion
Prior art date
Application number
PCT/EP1997/004370
Other languages
German (de)
English (en)
Inventor
Emil Hacker
Peter Sailer
Ernst Strian
Original Assignee
INA Wälzlager Schaeffler oHG
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 Wälzlager Schaeffler oHG filed Critical INA Wälzlager Schaeffler oHG
Priority to DE19781214T priority Critical patent/DE19781214D2/de
Publication of WO1998019053A1 publication Critical patent/WO1998019053A1/fr

Links

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
    • 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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
    • 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
    • F01L2001/187—Clips, e.g. for retaining rocker arm on pivot
    • 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
    • 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

Definitions

  • the invention relates to a rocker arm or rocker arm for a valve train of an internal combustion engine, which has at one end a spherical recess by means of which it is pivotally mounted relative to a spherical end of a support element, while its other end is operatively connected to a gas exchange valve.
  • the invention has for its object to manufacture the generic valve train with actuating lever and support element so that wear is reduced.
  • this object is achieved according to the characterizing part of claim 1 in that the spherical end of the support element and / or the dome-shaped recess of the rocker arm or finger lever have a contact surface with more than 10% carbide content.
  • carbides are understood to mean the mixed carbides of iron with the alloying elements such as chromium or manganese. Due to the carbide content, an appropriate choice of materials is made between the partners involved, which reduces adhesive and / or abrasive wear. This is particularly true for a valve train that must operate under the conditions of insufficient lubrication, i. H. Such a selection of materials is particularly resistant to thermomechanical stresses.
  • the carbides are embedded in a predominantly martensitic matrix and, in addition to increasing wear resistance, also provide an additional support effect for the matrix. In addition, such a carbide-rich matrix has increased tempering resistance, i. H. the loss of hardness caused by the frictional heating is shifted towards higher temperatures.
  • the carbide portion should be in globular form, ie with the greatest possible avoidance of a carbide network.
  • the carbide separates out along the boundaries and thus causes an embrittling effect.
  • the residual austenite should be below 50%, preferably below 30%. This is due to the fact that residual austenite is a relatively soft structural component and therefore its proportions must be limited. An increased residual austenite content can, however, reduce the abrasive wear, so that it is adjusted accordingly depending on the wear mechanism acting.
  • the rocker arm or finger follower or the support element can be made from a case hardening steel, a low-lying steel or a high-alloy steel. With all of the iron alloys mentioned, the corresponding carbide content can be adjusted without problems.
  • Figures 1 and 2 show a side view of a valve train, partially in section.
  • the valve drive shown in Figures 1 and 2 consists of a rocker arm 1, which has a dome-shaped recess 2 on the left side, in which a support element 3 with a piston with a spherical end 4 is arranged.
  • the rocker arm 1 On the right side, the rocker arm 1 is operatively connected to a gas exchange valve 5, a roller-mounted roller 6 being provided as a cam counter-rotor in its central part.
  • the piston of the support element 3 has an undercut 7 under its spherical end 4, in which a connecting element designed as a sheet metal holding clamp 8 engages.
  • an assembly consisting of rocker arm 1 and support element 3 is realized by the sheet metal holding bracket 8.
  • the two figures show the top and bottom dead center of a valve train. It is understandable that at several thousand revolutions per minute there is considerable susceptibility to wear between the dome-shaped recess 2 of the rocker arm 1 and the spherical end 4 of the support element 3 if no appropriate precautions are taken.
  • a support element 3 is made of a steel of the brand 16 MnCr 5, ie with 0.16% carbon, 1.25% manganese and 1.25% chromium. This support element 3 is subjected to a two-hour case hardening at approximately 900 °. After quenching in an oil bath, the contact surface of the spherical end 4 had a carbon content of 1.5% with 25% carbide content and 30% residual austenite.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

L'invention concerne un culbuteur ou basculeur (1) pour mécanisme de distribution d'un moteur à combustion interne, qui présente à une extrémité, un évidement (2) sous forme de calotte lui permetttant d'être monté de manière à se déplacer par pivotement à l'encontre d'une extrémité (4) sphérique d'un élément d'appui (3), son autre extrémité coopérant avec une soupape d'échange de gaz (5). Selon l'invention, l'extrémité sphérique (4) de l'élément d'appui (3) et/ou l'évidement (2) sous forme de calotte du culbuteur ou basculeur (1) comporte(nt) une surface de contact contenant plus de 10 % de carbure. Ce système permet d'obtenir une résistance à l'usure particulière du mécanisme de distribution.
PCT/EP1997/004370 1996-10-25 1997-08-12 Culbuteur ou basculeur pour mecanisme de distribution d'un moteur a combustion interne WO1998019053A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19781214T DE19781214D2 (de) 1996-10-25 1997-08-12 Kipp- oder Schlepphebel für einen Ventiltrieb einer Brennkraftmaschine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19644374A DE19644374A1 (de) 1996-10-25 1996-10-25 Kipp- oder Schlepphebel für einen Ventiltrieb einer Brennkraftmaschine
DE19644374.1 1996-10-25

Publications (1)

Publication Number Publication Date
WO1998019053A1 true WO1998019053A1 (fr) 1998-05-07

Family

ID=7809963

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/004370 WO1998019053A1 (fr) 1996-10-25 1997-08-12 Culbuteur ou basculeur pour mecanisme de distribution d'un moteur a combustion interne

Country Status (2)

Country Link
DE (2) DE19644374A1 (fr)
WO (1) WO1998019053A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003056315A (ja) * 2001-08-22 2003-02-26 Ntn Corp ローラ付きカムフォロア
EP1482190B1 (fr) * 2003-05-27 2012-12-05 Nissan Motor Company Limited Elément de roulement
DE102004005831A1 (de) * 2004-02-06 2005-08-25 Ina-Schaeffler Kg Verbindungsvorrichtung für einen Betätigungshebel und ein Abstützelement einer Ventilsteuerung einer Brennkraftmaschine
DE102004037274A1 (de) * 2004-07-31 2006-02-16 Ina-Schaeffler Kg Oberflächenausgestaltung einer vorbestimmten Fläche eines einem reibenden Verschleiß ausgesetzten Maschinenteils und Verfahren zur Herstellung derselben
CN103939161B (zh) * 2014-04-16 2016-08-03 杭州新坐标科技股份有限公司 用于连接滚轮摇臂和液压挺柱的球头卡片

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3542001A (en) 1968-10-25 1970-11-24 Eaton Yale & Towne Hydraulic lifter with lash compensator
US4870931A (en) * 1987-05-30 1989-10-03 Nippon Piston Ring Co., Ltd. Rocker arm having wear resistant scuffing resistant portion
EP0423832A1 (fr) * 1989-10-20 1991-04-24 Nissan Motor Co., Ltd. Culbuteur en fonte à teneur élevée en chrome

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2506333B2 (ja) * 1986-03-12 1996-06-12 日産自動車株式会社 耐摩耗性鉄基焼結合金

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3542001A (en) 1968-10-25 1970-11-24 Eaton Yale & Towne Hydraulic lifter with lash compensator
US4870931A (en) * 1987-05-30 1989-10-03 Nippon Piston Ring Co., Ltd. Rocker arm having wear resistant scuffing resistant portion
EP0423832A1 (fr) * 1989-10-20 1991-04-24 Nissan Motor Co., Ltd. Culbuteur en fonte à teneur élevée en chrome

Also Published As

Publication number Publication date
DE19781214D2 (de) 2000-01-05
DE19644374A1 (de) 1998-04-30

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