EP0496982A1 - Poussoir en métal léger muni d'une armature anti-usure à matrice austénitique - Google Patents

Poussoir en métal léger muni d'une armature anti-usure à matrice austénitique Download PDF

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Publication number
EP0496982A1
EP0496982A1 EP91120741A EP91120741A EP0496982A1 EP 0496982 A1 EP0496982 A1 EP 0496982A1 EP 91120741 A EP91120741 A EP 91120741A EP 91120741 A EP91120741 A EP 91120741A EP 0496982 A1 EP0496982 A1 EP 0496982A1
Authority
EP
European Patent Office
Prior art keywords
steel plate
light metal
tappet
hardened
steel
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
EP91120741A
Other languages
German (de)
English (en)
Other versions
EP0496982B1 (fr
Inventor
Karl-Ludwig Dipl.-Ing. Grell
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.)
INA Waelzlager Schaeffler OHG
Original Assignee
INA Waelzlager 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 Waelzlager Schaeffler OHG filed Critical INA Waelzlager Schaeffler OHG
Publication of EP0496982A1 publication Critical patent/EP0496982A1/fr
Application granted granted Critical
Publication of EP0496982B1 publication Critical patent/EP0496982B1/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
    • F01L1/14—Tappets; Push rods
    • F01L1/16—Silencing impact; Reducing wear
    • 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
    • F01L1/245—Hydraulic tappets
    • F01L1/25—Hydraulic tappets between cam and valve stem
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49298—Poppet or I.C. engine valve or valve seat making
    • Y10T29/49304—Valve tappet making

Definitions

  • the invention initially relates to a light metal tappet, in particular for the valve control of an internal combustion engine, with a tappet base body and a steel plate anchored on the contact surface for the control cams of the valve control, which has a hardened surface.
  • Such light metal tappets as described for example in EP 0 030 780 B1, are exposed to relatively large temperature fluctuations from -30 ° C. during a cold start to approximately 130 ° C. during operation of an internal combustion engine.
  • the problem here is the possibly different thermal expansion of the materials used.
  • the steel plate anchored as a wear-resistant insert in a light metal plunger has good wear properties, it tends to detach when subjected to a corresponding thermal load. The thermal load capacity is therefore limited.
  • Another disadvantage in terms of application technology is that the installation space in the form of a relatively wide edge as a functional surface or as a cam contact surface, which is contacted by the control cam of a valve control, is lost.
  • the object of the present invention is to provide a light metal tappet with an anchored steel plate, the surface of which has a high ductility with high wear resistance and hardness.
  • the steel plate consists of an austenitic, carbon-precipitation-hardened base material, which has the same coefficient of expansion as aluminum, with a nitrided surface, a further Solidification is given by the fact that the surface of the steel plate is additionally work hardened.
  • the work hardening of the surface of the steel plate is carried out by shot peening.
  • the steel plate is welded to a ram base body with a thin-walled cup shirt, the cup shirt consisting of an alloyed aluminum material, in particular AlSi 18 CuMgNi, and having a wall thickness of approximately 0.6 to 2.5 mm.
  • the thermal expansion coefficients of the tappet base body and the steel plate are almost the same, and that the tappet base body consists of ceramic, plastic, duroplastic or fiber reinforced light metal material.
  • the steel plate is provided with holding teeth on its underside facing the plunger base body.
  • the invention further relates to a method for producing a light metal tappet, in particular for the valve control of an internal combustion engine, with a tappet base body and a steel plate anchored on the contact surface for the cams of the valve control, which has a hardened surface, which is part of the object of the invention
  • a light metal plunger can be manufactured with an anchored steel plate.
  • a steel plate having an austenitic matrix is carburized and precipitation hardened and the surface facing the control cam is then nitrided, it being advantageous for the surface to be nitrided during the heat treatment or for the surface to be additionally work hardened, nitriding can be carried out in a gas stream, in a nitriding bath or in a plasma process.
  • a high-alloy, austenitic and martensite-free steel is used, which can additionally be hardened with carbon precipitation, bath nitrided or cold worked.
  • valve control 25 of a combustion engine essentially consists of a control cam 19 which acts against the surface 16 of a tappet 10.
  • the control cam 19 in turn is arranged in a rotationally fixed manner on a camshaft 23.
  • the plunger 10 is not one in a sliding guide 20
  • Cylinder head 24 shown in detail can be moved up and down and acts on the side facing away from the control cam 19 against the valve stem 21 of a valve, not shown.
  • a valve spring 22 is assigned to the valve stem 21 and ensures the resetting of the tappet 10.
  • the plunger 10 shown in detail in FIG. 2 consists of a light metal alloy, for example AlSi 18 CuMgNi, and has a plunger body 11 in which a steel plate 12 is anchored or welded.
  • the plunger or cup body 11 has a plunger housing or cup shirt 13 pointing away from the steel plate 12, which is provided with an annular groove 14 toward the steel plate 12. In this annular groove 14, the steel plate 12 can be pressed, cast or pressed with holding teeth 15 having brackets 15a.
  • the steel plate 12 consists of an austenitic matrix which is hardened like a carbon precipitate. On its surface 16 facing away from the tappet body 11, the steel plate 12 is nitrided, i. H. enriched with nitrogen. The surface 16 thereby receives a wear layer which is firmly connected to the matrix by diffusion. To further increase the wear resistance, the surface 16 can be work hardened.
  • the steel plate 12 is provided on its inside 17 with stiffening elements 18 directed outward in the form of spokes.
  • a steel plate 12 consists of a high-alloy steel, for example X5CrNi18-9. This steel has almost the same coefficient of thermal expansion as the above-mentioned light metal alloy of the plunger 10. Due to the austenitic matrix, the steel plate 12 has a high ductility and is particularly wear-resistant due to the nitriding and work hardening of the surface 16 on the contact surface of the control cam 19 and is suitable for installation in a cylinder head 24, not shown, with a valve control 25 of an internal combustion engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)
  • Heat Treatment Of Articles (AREA)
EP91120741A 1991-02-01 1991-12-03 Poussoir en métal léger muni d'une armature anti-usure à matrice austénitique Expired - Lifetime EP0496982B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4102988 1991-02-01
DE4102988A DE4102988C1 (fr) 1991-02-01 1991-02-01

Publications (2)

Publication Number Publication Date
EP0496982A1 true EP0496982A1 (fr) 1992-08-05
EP0496982B1 EP0496982B1 (fr) 1994-02-23

Family

ID=6424143

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91120741A Expired - Lifetime EP0496982B1 (fr) 1991-02-01 1991-12-03 Poussoir en métal léger muni d'une armature anti-usure à matrice austénitique

Country Status (4)

Country Link
US (1) US5184583A (fr)
EP (1) EP0496982B1 (fr)
JP (1) JPH0559913A (fr)
DE (2) DE4102988C1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29501151U1 (de) * 1995-01-25 1995-03-02 INA Wälzlager Schaeffler KG, 91074 Herzogenaurach Stößel mit einer geteilten Hemdfläche
WO1995006192A1 (fr) * 1993-08-24 1995-03-02 Ina Wälzlager Schaeffler Kg Poussoir de soupape cupuliforme
DE19509665A1 (de) * 1995-03-17 1996-09-19 Schaeffler Waelzlager Kg Mechanischer Ventilstößel

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05202706A (ja) * 1992-01-29 1993-08-10 Daido Steel Co Ltd エンジンバルブおよびその製造方法
US5361648A (en) * 1992-04-07 1994-11-08 Nsk Ltd. Rolling-sliding mechanical member
GB9221817D0 (en) * 1992-10-16 1992-12-02 Automotive Products Plc A differential mechanism
GB2273139B (en) * 1992-11-12 1996-05-15 Ford Motor Co Low friction valve train for an internal combustion engine
JPH11132012A (ja) * 1997-10-29 1999-05-18 Fuji Oozx Inc 軽金属製タペット及びその製造方法
WO2023154505A1 (fr) * 2022-02-14 2023-08-17 Awa Forged Composites, Llc Procédé de conception et de production de poussoirs en polymère renforcé par des fibres

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1181552A (en) * 1966-02-24 1970-02-18 Earl Avery Thompson Improvements in or relating to Articles made of High-Chromium, High-Carbon Iron Alloys, Hydraulic Valve Tappets made from these Alloys, and to Processes for making said Articles and Tappets.
EP0030780A1 (fr) * 1979-12-05 1981-06-24 Eaton Corporation Pilon léger pour dispositif de valve à action directe
DE3519015A1 (de) * 1985-05-25 1986-11-27 INA Wälzlager Schaeffler KG, 8522 Herzogenaurach Aeusseres fuehrungsteil fuer einen ventilstoessel fuer verbrennungskraftmaschinen
DE3721677A1 (de) * 1987-07-01 1989-01-12 Irm Antriebstech Gmbh Tassenstoessel mit hydraulischem ventilspielausgleich und verfahren zum herstellen eines solchen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3409235A1 (de) * 1984-03-14 1985-09-19 Motomak Motorenbau, Maschinen- u. Werkzeugfabrik, Konstruktionen GmbH, 8070 Ingolstadt Aeusseres fuehrungsteil fuer einen ventilstoessel fuer verbrennungskraftmaschinen
JPS63109151A (ja) * 1986-10-27 1988-05-13 Hitachi Ltd 高硬度複合材およびその製造方法
JPS63289306A (ja) * 1987-05-22 1988-11-25 日本特殊陶業株式会社 摺動部品の製造法
US4909198A (en) * 1988-03-01 1990-03-20 Toyota Jidosha Kabushiki Kaisha Aluminum alloy valve lifter with sprayed coating and method of producing same
DE3920729A1 (de) * 1989-06-24 1991-01-10 Gmb Giesserei & Maschinenbau B Tassenstoesselkoerper fuer ventilstoessel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1181552A (en) * 1966-02-24 1970-02-18 Earl Avery Thompson Improvements in or relating to Articles made of High-Chromium, High-Carbon Iron Alloys, Hydraulic Valve Tappets made from these Alloys, and to Processes for making said Articles and Tappets.
EP0030780A1 (fr) * 1979-12-05 1981-06-24 Eaton Corporation Pilon léger pour dispositif de valve à action directe
DE3519015A1 (de) * 1985-05-25 1986-11-27 INA Wälzlager Schaeffler KG, 8522 Herzogenaurach Aeusseres fuehrungsteil fuer einen ventilstoessel fuer verbrennungskraftmaschinen
DE3721677A1 (de) * 1987-07-01 1989-01-12 Irm Antriebstech Gmbh Tassenstoessel mit hydraulischem ventilspielausgleich und verfahren zum herstellen eines solchen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995006192A1 (fr) * 1993-08-24 1995-03-02 Ina Wälzlager Schaeffler Kg Poussoir de soupape cupuliforme
US5954020A (en) * 1993-08-24 1999-09-21 Ina Walzlager Schaeffler Kg Cup-shaped tappet
CN1048536C (zh) * 1993-08-24 2000-01-19 Ina滚柱轴承制造两合公司 杯形阀门挺杆
DE29501151U1 (de) * 1995-01-25 1995-03-02 INA Wälzlager Schaeffler KG, 91074 Herzogenaurach Stößel mit einer geteilten Hemdfläche
DE19509665A1 (de) * 1995-03-17 1996-09-19 Schaeffler Waelzlager Kg Mechanischer Ventilstößel

Also Published As

Publication number Publication date
DE59101048D1 (de) 1994-03-31
US5184583A (en) 1993-02-09
DE4102988C1 (fr) 1992-04-16
JPH0559913A (ja) 1993-03-09
EP0496982B1 (fr) 1994-02-23

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