EP1107839B1 - Verfahren zur herstellung einer nockenwelle und danach hergestellte nockenwelle - Google Patents

Verfahren zur herstellung einer nockenwelle und danach hergestellte nockenwelle Download PDF

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Publication number
EP1107839B1
EP1107839B1 EP00918679A EP00918679A EP1107839B1 EP 1107839 B1 EP1107839 B1 EP 1107839B1 EP 00918679 A EP00918679 A EP 00918679A EP 00918679 A EP00918679 A EP 00918679A EP 1107839 B1 EP1107839 B1 EP 1107839B1
Authority
EP
European Patent Office
Prior art keywords
camshaft
tube
high pressure
cams
produced
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
EP00918679A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1107839A1 (de
Inventor
Bodo Furchheim
Hoang Le Thien
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.)
Se Sachsische Elektronenstrahl GmbH
Original Assignee
Se Sachsische Elektronenstrahl GmbH
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
Priority claimed from DE1999109184 external-priority patent/DE19909184C2/de
Priority claimed from DE1999132810 external-priority patent/DE19932810C2/de
Priority claimed from DE2000105690 external-priority patent/DE10005690C2/de
Application filed by Se Sachsische Elektronenstrahl GmbH filed Critical Se Sachsische Elektronenstrahl GmbH
Publication of EP1107839A1 publication Critical patent/EP1107839A1/de
Application granted granted Critical
Publication of EP1107839B1 publication Critical patent/EP1107839B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/84—Making other particular articles other parts for engines, e.g. connecting-rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/84—Making other particular articles other parts for engines, e.g. connecting-rods
    • B21D53/845—Making camshafts

Definitions

  • the invention relates to a method for producing camshafts and one according to camshaft manufactured using this method. It is preferably a Camshafts for engines for motor vehicles, but the method is also suitable for similar products, e.g. Cam discs arranged on a shaft manufacture. These are elements that have a rotational movement in a lifting movement implement by moving the lifting elements on rotating disks with different Run curvature and be moved against the direction of rotation.
  • Camshafts are known which are made in one piece, i.e. forged or are poured.
  • the running surfaces of the cams, which are subject to wear, are after mechanical machining by laser beams, electron beams or TIG remelted or e.g. inductive or a thermal / chemical Process hardened. Then the further mechanical treatment takes place. e.g. the Grinding the bearings and cam shapes.
  • These camshafts have the disadvantage that their weight and the mass to be moved are very high. The high mass of Camshaft adversely affects fuel consumption. Another disadvantage is the high mechanical effort involved in processing the blank.
  • camshafts It is also known to manufacture camshafts from individual parts.
  • the single ones Cams are placed on the shaft, and preferably by welding connected, pressed or shrunk.
  • Weight of the solid cam discs removed from one piece, because the shaft can be a hollow shaft, but the manufacturing effort is still very high.
  • camshafts in such a way that an elongated one Hollow body, i.e. a hollow shaft by hydroforming - forming process (IHU process ) Forms acting as cams individually or one after the other or are generated simultaneously (DE-A-196 17 593).
  • IHU process hydroforming - forming process
  • Corresponding two-part or four-part tools ensure that Push the hollow shaft in the axial direction that defines the position of the cams arise and a one-piece molding takes place (WO 97/46341).
  • the camshaft manufactured by this method is deficient afflicted with the fact that the production costs compared to the forged or composite camshafts are lower, but the wear resistance of the Cam area is insufficient. It is not possible to use a material that Wear resistance ensures that the IHU process is practiced. Besides, it is not possible with a small distance between the cams on the shaft, as is usually the case with Automotive engines are required to produce a flat tread on the cams, because at the places of the highest degree of forming are inevitably weakened, which negatively affects the strength.
  • the invention has for its object a method for producing To create camshafts with which by using the known Internal high-pressure forming process can produce camshafts that are firm have low deflection, high torsional strength and high Have flexural rigidity in the load areas on the cam flank and tip.
  • the manufacturing process should be simple. Applying an additional layer, i.e. Wear protection layer in a further process step should be omitted, as well elaborate mechanical rework. The use of materials should be low. The number the required items for the entire camshaft are said to be known Manufacturing processes for camshafts can be reduced.
  • the essence of the invention is that in a separate process accordingly hard and wear-resistant support rings with a small wall thickness and final shape of the cam are produced by these support rings Internal high pressure forming (called IHU) placed in an IHU tool and through the IHU tool and axial forces introduced into the pipe in connection with over a pressure medium generates internal forces a one - or two - stage transformation of the Tube to the camshaft.
  • IHU Internal high pressure forming
  • Process stage is through the hydroforming process the pipe in the area in which the cams are arranged, expanded, with the support rings corresponding to the Positions of the cams are inserted.
  • the support rings In the case of cams that run very pointed, the support rings have the same wall thickness have the disadvantage that the tube is subject to a high degree of deformation and under A multi-stage forming process may be necessary. With that rise Manufacturing costs with falling productivity. Furthermore exist outside of Camshaft in the cylinder head Interfering contours between or next to the cam. Through it the available space is limited and the IHU process is made more difficult. This limitation is, if at all, only due to a complicated, multi-stage Eliminate IHU process. This in turn requires high manufacturing costs. Therefore there is an advantageous embodiment of the method, or of those produced thereafter Wave in that the support rings, which are manufactured in a separate process, correspond to the function-related contour on the outside and a slightly larger one on the inside Have diameter than the tube. The wall thickness of the support ring is not uniformly thick, but has a greater thickness in the area of the cam tip. This means that the support ring has a variable thickness as a cam and the inner contour is no circle.
  • the method according to the invention essentially consists of two or several well-known modern manufacturing processes can be combined.
  • Another advantageous embodiment of the method consists in that drive and / or control elements also attached to the shaft by the IHU method become. Storage areas can also be expanded by expanding the pipe through the IHU - Processes are generated. Especially those due to the plastic deformation process The resulting strain hardening of the pipe material is advantageous.
  • the camshaft produced by the method according to the invention is characterized by hollow cams and very thin-walled support rings in weight very light and owns high rigidity.
  • the support rings do not or only slightly mechanically reworked.
  • Their hardness is according to the requirements already given what the usual subsequent hardening, e.g. induction hardening or remelt hardening in a vacuum process.
  • the further design of the method provides an additional advantage in that the round kneading or upsetting in connection with the IHU process in contrast to all known manufacturing processes a very low manufacturing cost and thus also requires low costs. Above all, these are reduced that the number of separate parts to be manufactured and then joined is very low.
  • the manufacturing according to the invention eliminates sources of error that could occur due to the previous joining of end pieces.
  • the method also consists in the functional elements being kneaded can be produced in their geometry, dimensional accuracy and surface quality and a require very little mechanical rework. Often only one is required Grinding process for completion.
  • the camshaft produced by the method according to the invention consists of a small number of individual parts. With the end of the forming process, they are Cam rings non-positively and positively connected to the shaft.
  • the support rings opposite the prior art consists of plastics or sintered materials. This Materials offer the advantage of simple manufacture at low manufacturing costs.
  • Ceramic materials can also be used. You have the advantage with the highest wear resistance and lowest weight, the lightest Manufacture camshaft.
  • camshaft Another advantageous embodiment of the camshaft is that the tube made of aluminum or titanium. This makes the camshaft very light.
  • a thin-walled tube 1 made of a readily deformable material is by IHU deformation the camshaft is produced close to the contour in a press mold; i.e. the places where a cam 2 has its seat is according to the dimensions of the cam 2 and shaped their location.
  • the shaft with its cam 2 is a single hollow body.
  • a tube made of wear-resistant material profiled that the final shape of the support ring 3 (cam) is given and hardened.
  • the prefabricated tube 1 to be formed into the camshaft is formed by the Support rings 3 pushed and together with them in the open forming tool inserted. In this way, all individual parts are fixed in position.
  • the forming tool is axially closed and radial the force application can be used for forming.
  • the Force application begins with a defined axial force on the pipe 1 and / or Tool, supported by a defined internal pressure in the pipe 1. After the The tool is completely closed axially and radially using a pure IHU process the positive and non-positive connection of tube 1 and support ring 3. On the End of the tube 1 are bearing or drive elements 5 in a known manner applied. It is also possible to use the IHU process on tube 1 Fasten.
  • Another example is the manufacture of a camshaft by the IHU - Process described in combination with the kneading process according to FIG. 4.
  • the tube 1 made of a readily deformable material is deformed to thicken at its ends by kneading or upsetting. This reduces its inside diameter D I on one side and produces its outside diameter D A , so that a zone 6 reinforcing the camshaft is created.
  • a functional element 7 the seat of which is brought to its final dimension by grinding.
  • the inner diameter D is likewise reduced by kneading or upsetting, at the same time as the kneading of the end already described, and a further functional element 7 (bearing seat, control cam, etc.) is created.
  • the collar 8 is also upset, which is necessary for flanging on other units.
  • the support rings 3 which are produced in a separate process and which correspond to the shape of the cams, and the sprocket (not marked) are attached in a force-fitting and positive manner by IHU processes.
  • the support rings 3 and the sprocket are placed in the hydroforming tool.
  • Fig. 5 an embodiment of the camshaft is shown, in which the support ring 3 a has different thickness.
  • the tube 1 made of a readily deformable material has an outer diameter d a .
  • the support ring 3 made of sintered metal has the function-related shape on the outside and is not a circle on the inside. Its inner diameter D i is slightly larger than the outer diameter d a of the tube 1.
  • the thickness of the support ring 3 is not constant.
  • the height A which would arise if one assumes a constant support ring thickness, is greater than the height A 'of the maximum deformation of the tube 1, and thus the radius R i ' in the region of the deformation of the tube 1 is greater than R i when assumed same thickness c of the support ring 3. In this area, the thickness c 'of the support ring 3 is greater and runs in the constant thickness c.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Gears, Cams (AREA)
EP00918679A 1999-03-03 2000-02-23 Verfahren zur herstellung einer nockenwelle und danach hergestellte nockenwelle Expired - Lifetime EP1107839B1 (de)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE19909184 1999-03-03
DE1999109184 DE19909184C2 (de) 1999-03-03 1999-03-03 Verfahren zur Herstellung einer Nockenwelle und danach hergestellte Nockenwelle
DE19932810 1999-07-09
DE1999132810 DE19932810C2 (de) 1999-07-09 1999-07-09 Verfahren zur Herstellung einer Nockenwelle und danach hergestellte Nockenwelle
DE2000105690 DE10005690C2 (de) 1999-07-09 2000-02-09 Nockenwelle
DE10005690 2000-02-09
PCT/DE2000/000536 WO2000051759A1 (de) 1999-03-03 2000-02-23 Verfahren zur herstellung einer nockenwelle und danach hergestellte nockenwelle

Publications (2)

Publication Number Publication Date
EP1107839A1 EP1107839A1 (de) 2001-06-20
EP1107839B1 true EP1107839B1 (de) 2004-09-29

Family

ID=27213642

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00918679A Expired - Lifetime EP1107839B1 (de) 1999-03-03 2000-02-23 Verfahren zur herstellung einer nockenwelle und danach hergestellte nockenwelle

Country Status (11)

Country Link
EP (1) EP1107839B1 (ko)
JP (1) JP2003505245A (ko)
KR (1) KR100648743B1 (ko)
AT (1) ATE277700T1 (ko)
BR (1) BR0005227A (ko)
CZ (1) CZ298111B6 (ko)
DE (1) DE50007978D1 (ko)
DK (1) DK1107839T3 (ko)
ES (1) ES2233357T3 (ko)
HU (1) HU228548B1 (ko)
WO (1) WO2000051759A1 (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2000230A1 (de) * 2007-06-06 2008-12-10 Muhr und Bender KG Verfahren zur Herstellung von Nocken für gebaute Nockenwellen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016123557A1 (de) 2016-12-06 2018-06-07 Thyssenkrupp Ag Verfahren zum Herstellen von Nocken, Nockenwellen und Nockenwellenmodulen und derart hergestellter Nocken

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58148028A (ja) * 1982-02-26 1983-09-03 Masanobu Nakamura 偏心部を有するシヤフトの製造方法
JPS59105647U (ja) * 1982-12-29 1984-07-16 三菱マテリアル株式会社 カムシヤフト
JPS61266132A (ja) * 1985-05-21 1986-11-25 Musashi Seimitsu Ind Co Ltd 組立カムシヤフトの製造方法
JPH064173B2 (ja) * 1985-11-19 1994-01-19 日本ピストンリング株式会社 組立カムシャフトの製造方法
DE3704092C1 (de) * 1987-02-10 1988-05-26 Schneider Gesenkschmiede Hohlwelle sowie Verfahren zu ihrer Herstellung
US5259268A (en) * 1987-02-10 1993-11-09 Gesenkschmiede Schneider Gmbh Hollowshaft and method for the production thereof
DE3941718A1 (de) * 1989-12-18 1991-06-20 Balcke Duerr Ag Verfahren und vorrichtung zum lagegenauen befestigen von teilen auf einem hohlkoerper
JPH04175403A (ja) * 1990-03-26 1992-06-23 Mazda Motor Corp エンジン用カムシャフト
JPH0471729A (ja) * 1990-07-11 1992-03-06 Masanobu Nakamura カムシャフトの製造方法
JPH089479Y2 (ja) * 1991-04-27 1996-03-21 武蔵精密工業株式会社 組立カムシャフト
JPH0538528A (ja) * 1991-08-01 1993-02-19 Mazda Motor Corp 組立カムシヤフト及びその製造方法
JPH05180304A (ja) * 1991-12-26 1993-07-20 Mitsubishi Materials Corp 焼結カム
JPH0735706U (ja) * 1993-12-08 1995-07-04 松本重工業株式会社 カムシャフト
DE19617593A1 (de) * 1996-05-02 1998-01-29 Haerle Hans A Dipl Ing Hohle Nockenwelle aus Rohr
DE19622372B4 (de) * 1996-06-04 2006-06-01 Htm Härtetechnik & Metallbearbeitung Gmbh Verfahren und Vorrichtung zum Herstellen von Nockenwellen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2000230A1 (de) * 2007-06-06 2008-12-10 Muhr und Bender KG Verfahren zur Herstellung von Nocken für gebaute Nockenwellen
US8375580B2 (en) 2007-06-06 2013-02-19 Muhr Und Bender Kg Method for manufacturing cams for composite camshafts

Also Published As

Publication number Publication date
CZ298111B6 (cs) 2007-06-27
BR0005227A (pt) 2001-01-02
HU228548B1 (en) 2013-03-28
HUP0102216A3 (en) 2002-01-28
WO2000051759A1 (de) 2000-09-08
JP2003505245A (ja) 2003-02-12
KR100648743B1 (ko) 2006-11-23
DK1107839T3 (da) 2005-02-07
KR20010052298A (ko) 2001-06-25
HUP0102216A2 (hu) 2001-10-28
DE50007978D1 (de) 2004-11-04
EP1107839A1 (de) 2001-06-20
CZ20004442A3 (cs) 2001-09-12
ATE277700T1 (de) 2004-10-15
ES2233357T3 (es) 2005-06-16

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