EP0334064B1 - Elément dans la distribution d'un moteur à combustion interne - Google Patents

Elément dans la distribution d'un moteur à combustion interne Download PDF

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Publication number
EP0334064B1
EP0334064B1 EP89103613A EP89103613A EP0334064B1 EP 0334064 B1 EP0334064 B1 EP 0334064B1 EP 89103613 A EP89103613 A EP 89103613A EP 89103613 A EP89103613 A EP 89103613A EP 0334064 B1 EP0334064 B1 EP 0334064B1
Authority
EP
European Patent Office
Prior art keywords
component
coating
layer
control cam
valve gear
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
EP89103613A
Other languages
German (de)
English (en)
Other versions
EP0334064A1 (fr
Inventor
Norbert Dipl.-Chem.Dr. Geheeb
Ernst Dipl.-Ing.Dr. Mayer
Uwe Dipl.-Ing. Köhler
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 EP0334064A1 publication Critical patent/EP0334064A1/fr
Application granted granted Critical
Publication of EP0334064B1 publication Critical patent/EP0334064B1/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
    • F01L1/20—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
    • 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

Definitions

  • the invention relates to a component in the valve timing drive of an internal combustion engine, against the surface of which a control cam runs, in particular a tappet, a metallic coating having a layer thickness of at most 5 ⁇ m being applied to the surface against which the control cam runs.
  • the invention is based on the object of proposing a surface coating for components of this type which, in addition to favorable wear behavior, also ensures high flexural fatigue strength, compressive strength and thus long service life of the component.
  • the coating is a chrome layer with a layer thickness of preferably 2.5 microns, which consists of several layers applied one after the other, at least the first layer directly applied to the material of the component is free of microcracks, and the last layer has micro cracks.
  • a layer thickness of preferably 2.5 microns which consists of several layers applied one after the other, at least the first layer directly applied to the material of the component is free of microcracks, and the last layer has micro cracks.
  • the micro-crack-free first layer can expediently be applied by electrolytic metal deposition (electroplating) with a current density of approximately 15 A / dm 2, while the outer layer, which has at least 600 cracks / cm, is electroplated with a current density of less than 15 A / dm2 can be applied.
  • the chromium-coated component is expediently heated after the electroplating and kept at a temperature of approximately 120 ° C. for four hours before being allowed to cool in air.
  • valve train with a tappet is shown in longitudinal section:
  • the tappet 3 which contains a hydraulic valve clearance compensation element in a known manner, is mounted so as to be longitudinally displaceable.
  • the control cam 5 runs on the flat bottom 4 of the tappet 3, while the tappet, on the other hand, bears against the stem 6 of a control valve.
  • the bottom 4 of the tappet 3 is provided with a thin chrome layer 7 according to the invention.

Landscapes

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

Claims (2)

1. Composant dans la commande de soupape d'un moteur à combustion interne, composant, en particulier un poussoir à cloche (3), dont la surface (4) est contactée par une came de commande (5), un revêtement métallique d'une épaisseur de revêtement de 5 µm au maximum étant appliqué à cette surface contactée (4) par la came de commande (5), caractérisé en ce que le revêtement est un revêtement en chrome (7) avec une épaisseur de 2,5 µm de préférence, qui est constitué de plusieurs couches successivement appliquées, dont au moins la première couche appliquée directement au matériau du composant est exempte de microfissures et dont la dernière couche comprend des microfissures.
2. Composant selon la revendication 1, caractérisé en ce que la dernière couche qu'on applique comprend au moins 600 fissures/cm.
EP89103613A 1988-03-23 1989-03-02 Elément dans la distribution d'un moteur à combustion interne Expired - Lifetime EP0334064B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3809702A DE3809702A1 (de) 1988-03-23 1988-03-23 Bauteil im ventilsteuertrieb einer brennkraftmaschine
DE3809702 1988-03-23

Publications (2)

Publication Number Publication Date
EP0334064A1 EP0334064A1 (fr) 1989-09-27
EP0334064B1 true EP0334064B1 (fr) 1991-12-27

Family

ID=6350429

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89103613A Expired - Lifetime EP0334064B1 (fr) 1988-03-23 1989-03-02 Elément dans la distribution d'un moteur à combustion interne

Country Status (3)

Country Link
US (1) US4876996A (fr)
EP (1) EP0334064B1 (fr)
DE (2) DE3809702A1 (fr)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1230012B (it) * 1989-04-20 1991-09-20 Eaton Automotive Spa Punteria idraulica con condotto di aspirazione dell'olio, dal serbatoio esterno al serbatoio interno senza inclusioni di bolle d'aria, realizzato mediante lavorazione meccanica.
DE4117425C1 (fr) * 1991-05-28 1992-07-30 Fa. Carl Freudenberg, 6940 Weinheim, De
DE4118776A1 (de) * 1991-06-07 1992-12-10 Schaeffler Waelzlager Kg Mechanischer ventilstoessel fuer eine brennkraftmaschine
DE4220584C2 (de) * 1992-06-24 2001-02-01 Schaeffler Waelzlager Ohg Ventiltrieb einer Brennkraftmaschine
US5226389A (en) * 1992-11-04 1993-07-13 Eaton Corporation Direct acting tappet
US5249554A (en) * 1993-01-08 1993-10-05 Ford Motor Company Powertrain component with adherent film having a graded composition
US5237967A (en) * 1993-01-08 1993-08-24 Ford Motor Company Powertrain component with amorphous hydrogenated carbon film
DE4302877C2 (de) * 1993-02-02 1996-04-11 Schaeffler Waelzlager Kg Stößel
EP0618351B1 (fr) * 1993-03-25 1997-08-06 Fuji Oozx Inc. Poussoirs de soupapes pour moteurs à combustion interne
US5743224A (en) * 1993-09-14 1998-04-28 Unisia Jecs Corporation Valve lifter surface and processing method thereof
DE9317325U1 (de) * 1993-11-12 1994-01-05 Schaeffler Waelzlager Kg Stößel für einen Ventiltrieb einer Brennkraftmaschine
US6119644A (en) * 1997-05-22 2000-09-19 Ina Walzlager Schaeffler Ohg Hydraulic clearance compensation element
IT1302651B1 (it) * 1998-10-13 2000-09-29 Eaton Automotive Spa Punteria idraulica con perdita di altezza controllata.
US20020197504A1 (en) * 1999-12-27 2002-12-26 Hiroyuki Takamura Sliding member
JP4059621B2 (ja) * 2000-09-29 2008-03-12 日本ピストンリング株式会社 クロムめっき摺動部材及びその製造方法
US20050084610A1 (en) * 2002-08-13 2005-04-21 Selitser Simon I. Atmospheric pressure molecular layer CVD
DE10249761A1 (de) * 2002-10-25 2004-05-13 Ina-Schaeffler Kg Nockenfolger eines Ventiltriebs einer Brennkraftmaschine
DE102004028221A1 (de) 2004-06-09 2005-12-29 Ina-Schaeffler Kg Hochbeanspruchtes Motorenbauteil

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1425653A1 (de) * 1963-07-08 1969-01-23 Richard Kuechen Sen Ventilantrieb mit hydraulischem Spielausgleich

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US32167A (en) * 1861-04-23 Thomas h
US3131470A (en) * 1960-12-09 1964-05-05 Burgess Norton Mfg Co Method of making valve lifters
GB1044692A (en) * 1964-02-18 1966-10-05 Daimler Benz Ag Improvements relating to cam devices
US3545415A (en) * 1967-04-08 1970-12-08 Nippon Piston Ring Co Ltd Valve lifter with thin plastic coating
US4230491A (en) * 1979-01-08 1980-10-28 Stanadyne, Inc. Internal combustion engine tappet comprising a sintered powdered metal wear resistant composition
US4367701A (en) * 1979-12-05 1983-01-11 Eaton Corporation Acting valve gear
US4688526A (en) * 1983-12-07 1987-08-25 Eaton Corporation Self-contained hydraulic bucket lifter
JPS62255507A (ja) * 1986-04-30 1987-11-07 Hitachi Ltd バルブリフタ−の製造方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1425653A1 (de) * 1963-07-08 1969-01-23 Richard Kuechen Sen Ventilantrieb mit hydraulischem Spielausgleich

Also Published As

Publication number Publication date
US4876996A (en) 1989-10-31
DE3809702A1 (de) 1989-10-05
EP0334064A1 (fr) 1989-09-27
DE58900604D1 (de) 1992-02-06

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