EP0839990B1 - Arbre à cames assemblé - Google Patents

Arbre à cames assemblé Download PDF

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Publication number
EP0839990B1
EP0839990B1 EP97116683A EP97116683A EP0839990B1 EP 0839990 B1 EP0839990 B1 EP 0839990B1 EP 97116683 A EP97116683 A EP 97116683A EP 97116683 A EP97116683 A EP 97116683A EP 0839990 B1 EP0839990 B1 EP 0839990B1
Authority
EP
European Patent Office
Prior art keywords
cams
shaft body
camshaft
cast
iron
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
EP97116683A
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German (de)
English (en)
Other versions
EP0839990A1 (fr
Inventor
Roland Klaar
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Individual
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Individual
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Publication date
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Publication of EP0839990A1 publication Critical patent/EP0839990A1/fr
Application granted granted Critical
Publication of EP0839990B1 publication Critical patent/EP0839990B1/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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/08—Shape of cams
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • 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
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams

Definitions

  • the invention relates to a built camshaft, in particular for internal combustion engines, with a shaft body, on which separately manufactured cams are fixed are.
  • Built camshafts for example with a steel tube as the shaft body, can have various attached or attached parts, namely cams, sprocket mount, Thrust bearings, thrust bearing shoulder, signal transmitter, sprocket or the like.
  • a camshaft is said to be “built” if the shaft body and the Cams manufactured in a separate manner and the essentially finished Cams on the shaft body, e.g. by being attached. Such built Camshafts and their assembly are described in DE 41 21 951 C1 and in DE 195 20 306 A1.
  • Camshafts e.g. are cast from iron. Be camshafts traditionally for this very reason, i.e. with the cams, cast because the one-piece molding of the cams during casting is a very economical method of manufacture is.
  • cast iron can also be used when the camshaft to be cast entirely from a single part (i.e. with the cams); it reference is made to US-A-52 998 81.
  • the one-piece cast with the cam shaft body by a multi-part Steel shaft body must be replaced to save costs.
  • the one-piece camshafts can also be produced as hollow bodies; in this connection reference is made to GB-PS 15 96 442, GB-PS 11 91 202, JP-A-619 959, EP 0 154 787 B1 and EP 0 272 471 B1. Cast camshafts are usually made so that they the cams and other functional parts embrace in one piece when pouring.
  • Cams are used, not only can be machined very precisely (accuracy on the order of micrometers), but also at least one because of the kinematics of the lever linkage require concave area in circumference. Under a "concave" area is in In this sense, a circumferential cam section with over two geometric turning points decreasing and increasing radius of the cam. The lever roller runs through the concave peripheral section like a car wheel a bump. Of course, the concave circumferential area should also be exact how the other parts of the cam circumference are machined. The inventor recognized that these accuracy regulations only with economically justifiable means for individually manufactured cams, e.g. can be achieved by sintering. If lever linkage to be operated by the cams, practically only come built Camshafts in question.
  • camshafts of internal combustion engines are already based on vibration technology Aspects balanced by shaping the shaft, so that if possible optimal running smoothness at all possible speeds is present.
  • Such balancing comes from one, for example starting from of a steel tube, camshaft built is not really out of the question since one Steel pipe with economically and safety-related means as well as with that cannot balance the required micrometer accuracy.
  • optimal Balanced camshafts are only available in cast iron stores. With these However, camshafts (see above) cannot be used with the cam itself the accuracy required by modern technology.
  • the invention has for its object an alternatively produced shaft body to be specified for a camshaft.
  • the solution according to the invention exists for the built-in camshaft with a shaft body on which separately manufactured cams can be fixed in that a manufactured by casting Shaft body is provided.
  • the invention provides a cast camshaft for receiving a large number of cam parts for producing a composite or built camshaft.
  • This camshaft is said to be according to another invention with the exception of the actual cams, if possible, all of their other functional parts, such as sprocket mount, thrust bearing and position encoder, due to manufacturing or in one piece as a fixed part of the cast body.
  • the other functional parts of the Shaft production can be molded in one piece.
  • a decisive advantage of the invention is that the cast shaft body already in its manufacture in optimally balanced in terms of vibration technology is to be shaped. According to another invention, namely the shaft is beneficial in manufacturing profiled according to the predetermined balancing rules become.
  • the shaft body of camshafts can e.g. according to EP 0 272 471 B1 mentioned at the beginning using glass bodies with a through hole, with Pour blind holes and / or internal cavity. It's in the frame the invention, when casting the respective cavity already a profile specified on the inside of the shaft to generate immediately so that the shaft essentially the predetermined in this first production step vibrationally balanced accordingly is manufactured.
  • an outer profile In addition to or instead of this inner profile comes according to yet another invention, an outer profile - In particular also according to the intended Balancing - in question.
  • the shaft body can be made of metallic or non-metallic material, in particular from Iron-carbon material, from alloyed or unalloyed iron, made of lamellar or spheroidal graphite iron or cast steel and from injection molding and the like in the engine compartment of internal combustion engines usable materials.
  • the invention relates in the narrower sense only on the one piece with the additional functional parts required for the cams - but without precisely reworked cams - manufactured and if necessary balanced shaft body.
  • the individually produced The cams themselves can be made according to known joining processes (see DE 41 21 951 C1 and DE 195 20 306 A1 mentioned above) after essentially complete preprocessing on the shaft body be fixed.
  • Fig. 1 shows a built camshaft 1 with a shaft body 2, on which separately manufactured cams 3 are fixed.
  • a collar 4 of the shaft body 2 corrugated clamping sleeves 5 serve.
  • On the shaft body 2, which according to FIG. 1 preferably consists of a Steel pipe is required to complete the Camshaft 1 usually a hub or sprocket holder 6, an axial bearing 7 with a shoulder 8 and usually also an asymmetrical one Position transmitter 9 (for the first cylinder dead center detection) be fixed.
  • the receptacle 6 and / or the shoulder 8 can also be designed as a sprocket.
  • the parts 6 to 9 are required to complete a conventionally built 1 can be produced separately.
  • Camshaft with shaft body 12 made of cast iron sees externally essentially the same as the completely built one 1.
  • the cams 3 can be applied practically the same way with collar 4 and adapter sleeve 5 as in Fig. 1.
  • the receptacle 16, the thrust bearing 17, the shoulder 18 and the (asymmetrical) signal transmitter 19 already in one piece on the shaft body 11 during the production of the raw body 20 3 arise.
  • an outer layer 21 can be removed, so that the contour according to Fig. 2 is formed.
  • the camshaft according to the invention there is a significant advantage of the camshaft according to the invention in that the shaft body 12 already in its shape as a green body 20 (Fig. 3) by casting in the after vibration engineering Viewpoint optimally balanced manufactured can be.
  • the shaft body 12 in the area between two cams 3, where no bearings 23 are required, an oval, rectangular or similar non-circular cross-section, to achieve the desired balance.
  • the deformation for the purpose of balancing should be done so that the cams 3 is not hindered; Bulges of the outer surface are therefore usually not permitted.
  • a hollow cast (or otherwise hollow) camshaft can be achieved. If, for example, within the cast Shaft body 12 or the body 20 a sack-shaped cavity 24 according to Fig. 2 or 3, e.g. by inserting a quartz core, is formed - with the appropriate shape of the core - profiling already when casting on the inner surface manufactured with bulges 25 or indentations 26 that the shaft according to predetermined, e.g. calculated, Rules is already balanced as a raw body.
  • Fig. 4 shows an example of the cross section of an inventive on the shaft body 12 to be attached cam 3 which a point of their tread, ie their circumference 27, one has concave region 28 with two turning points 29.
  • the inner surface 30 of the cam 3 with a wave profile fitted to the shaft profile of the clamping sleeve 5 (Fig. 1 and 2) become.

Landscapes

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

Claims (3)

  1. Arbre à cames de structure composite, en particulier pour moteurs à combustion interne, muni d'un corps d'arbre sur lequel sont fixées des cames (3) fabriquées séparément, caractérisé en ce que l'on prévoit un corps d'arbre (12) fabriqué en fonderie.
  2. Arbre à cames selon la revendication 1, caractérisé en ce que l'on forme, par fabrication en une seule pièce, sur le corps d'arbre (12), à l'exception des cames (3), tous les éléments fonctionnels, tels que le récepteur (16) de la roue à chaíne, le palier axial (17) avec son épaulement (18) et le positionneur (19).
  3. Arbre à cames selon la revendication 1 ou 2, caractérisé en ce que le corps d'arbre (12) est profilé à l'extérieur (22) et/ou à l'intérieur (25, 26).
EP97116683A 1996-11-01 1997-09-25 Arbre à cames assemblé Expired - Lifetime EP0839990B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19645112A DE19645112A1 (de) 1996-11-01 1996-11-01 Gebaute Nockenwelle
DE19645112 1996-11-01

Publications (2)

Publication Number Publication Date
EP0839990A1 EP0839990A1 (fr) 1998-05-06
EP0839990B1 true EP0839990B1 (fr) 2001-04-25

Family

ID=7810415

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97116683A Expired - Lifetime EP0839990B1 (fr) 1996-11-01 1997-09-25 Arbre à cames assemblé

Country Status (6)

Country Link
US (1) US5992265A (fr)
EP (1) EP0839990B1 (fr)
AT (1) ATE200816T1 (fr)
BR (1) BR9705197A (fr)
CA (1) CA2219560A1 (fr)
DE (2) DE19645112A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19715856B4 (de) * 1997-04-16 2005-01-27 Volkswagen Ag Nockenwellenanordnung
AU2001287196A1 (en) * 2000-08-18 2002-03-04 Jesel, Inc. Modular camshaft assembly
GB2385888B (en) * 2002-06-21 2004-05-05 Jean-Pierre Pirault Improvements to latchable cam lobe systems for poppet valve motion control
JP2004124244A (ja) * 2002-09-30 2004-04-22 Nippon Piston Ring Co Ltd 高精度焼結カムロブ材
DE10302260B4 (de) * 2003-01-22 2005-03-24 Thyssenkrupp Automotive Ag Vorrichtung zur Betätigung der Ladungswechselventile in Hubkolbenmotoren
DE10330449B3 (de) * 2003-07-05 2005-02-24 Daimlerchrysler Ag Nockenwellenversteller
US20050045128A1 (en) * 2003-08-27 2005-03-03 Borgwarner Inc. Camshaft incorporating variable camshaft timing phaser rotor
DE102004011815A1 (de) 2004-03-11 2005-09-29 Daimlerchrysler Ag Nockenwelle und Verfahren zur Herstellung einer Nockenwelle
US7234428B2 (en) * 2005-07-28 2007-06-26 Briggs And Stratton Corporation Cam shaft assembly for an engine
DE102007051517B4 (de) * 2006-12-22 2020-02-27 Leichtbau-Zentrum Sachsen Gmbh Hohlwelle aus Faserverbundwerkstoff und darauf zu befestigende Funktionselemente
US8807106B2 (en) * 2010-03-19 2014-08-19 Textron Inc. Camshaft
MX2016010930A (es) * 2016-08-23 2017-04-03 Arbomex S A De C V Proceso de fabricacion de arbol de levas con componente funcional como inserto de ensamble y el arbol de levas obtenido con el mismo.
DE102021213711A1 (de) 2021-12-02 2023-06-07 Mahle International Gmbh Welle für einen Ventiltrieb

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2336241A1 (de) * 1973-07-17 1975-02-06 Volkswagenwerk Ag Poly-metallische, zusammengefuegte steuerwellen
DE2546802A1 (de) * 1975-10-18 1977-04-28 Kloeckner Humboldt Deutz Ag Nockenwelle fuer hubkolbenmaschinen
DE3301749A1 (de) * 1983-01-20 1984-08-09 Mahle Gmbh, 7000 Stuttgart Nockenwelle fuer verbrennungsmotoren
DE3521206A1 (de) * 1985-06-13 1986-12-18 Sintermetallwerk Krebsöge GmbH, 5608 Radevormwald Verfahren und vorrichtung zum herstellen von steuerwellen

Family Cites Families (23)

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Publication number Priority date Publication date Assignee Title
GB1191202A (en) * 1967-04-01 1970-05-13 Nippon Piston Ring Co Ltd Method of Producing Cam Shafts and Cam Shafts Produced by Such Method
US3999277A (en) * 1974-07-02 1976-12-28 Hiroshi Hamada Method of manufacturing assembly-type camshaft
GB1596442A (en) * 1978-02-07 1981-08-26 Lydmet Ltd Casting of long hollow objects
DE3205952A1 (de) * 1981-09-12 1983-03-31 J. Wizemann Gmbh U. Co, 7000 Stuttgart Nockenwelle
GB2147388B (en) * 1983-09-29 1986-10-08 Dana Corp Balance weights
GB8403355D0 (en) * 1984-02-08 1984-03-14 Clancy Ltd G Castings
JPS603961A (ja) * 1984-05-07 1985-01-10 V I V Eng Kk カムシヤフトの製造方法
JPS619959A (ja) * 1984-06-27 1986-01-17 Honda Motor Co Ltd 中空軸の鋳造方法
JPS6330655A (ja) * 1986-07-25 1988-02-09 Hitachi Ltd カムシヤフトの製造方法
DE3712609A1 (de) * 1986-12-15 1988-06-23 Monforts Eisengiesserei Verfahren und giessform zum herstellen eines gusseisenkoerpers und danach hergestellter gusseisenkoerper
DE3705114A1 (de) * 1987-02-18 1988-09-22 Audi Ag Nockenwelle aus gusseisen fuer brennkraftmaschinen
DE3720597C1 (de) * 1987-05-12 1988-08-11 Schneider Gesenkschmiede Hohlwelle
DE4004505A1 (de) * 1990-02-14 1991-08-22 Bayerische Motoren Werke Ag Verfahren zum herstellen einer nockenwelle
WO1992002739A1 (fr) * 1990-07-27 1992-02-20 Mettler Friedli Karl Assemblage d'un corps cylindrique fabrique a la cote exacte
DE4121951C1 (fr) * 1991-07-03 1992-12-24 Supervis Ets
GB9120021D0 (en) * 1991-09-19 1991-11-06 Lydmet Ltd Camshafts
JP3230606B2 (ja) 1992-06-30 2001-11-19 株式会社エヌ・ティ・ティ・データ 固有名詞特定方法
US5428894A (en) * 1992-07-13 1995-07-04 The Torrington Company Method of making a camshaft
DE4420092C3 (de) * 1994-06-09 2001-08-09 Daimler Chrysler Ag Verfahren zum Herstellen einer gebauten Nockenwelle mit induktionsgehärteten Nocken
JP3394357B2 (ja) * 1995-05-10 2003-04-07 Ｎｔｎ株式会社 カムシャフト
DE19520306C2 (de) * 1995-06-02 1998-05-20 Ford Werke Ag Zusammengesetzte Nockenwelle, insbesondere für Brennkraftmaschinen
US5797180A (en) * 1996-08-28 1998-08-25 Tecumseh Products Company Method of manufacturing a plastic camshaft with a tubular metal insert
US5778841A (en) * 1997-02-26 1998-07-14 Cummins Engine Company, Inc. Camshaft for internal combustion engines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2336241A1 (de) * 1973-07-17 1975-02-06 Volkswagenwerk Ag Poly-metallische, zusammengefuegte steuerwellen
DE2546802A1 (de) * 1975-10-18 1977-04-28 Kloeckner Humboldt Deutz Ag Nockenwelle fuer hubkolbenmaschinen
DE3301749A1 (de) * 1983-01-20 1984-08-09 Mahle Gmbh, 7000 Stuttgart Nockenwelle fuer verbrennungsmotoren
DE3521206A1 (de) * 1985-06-13 1986-12-18 Sintermetallwerk Krebsöge GmbH, 5608 Radevormwald Verfahren und vorrichtung zum herstellen von steuerwellen

Also Published As

Publication number Publication date
BR9705197A (pt) 2001-03-20
US5992265A (en) 1999-11-30
DE59703428D1 (de) 2001-05-31
EP0839990A1 (fr) 1998-05-06
CA2219560A1 (fr) 1998-05-01
DE19645112A1 (de) 1998-05-14
ATE200816T1 (de) 2001-05-15

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