EP0516946B1 - Assembled camshaft - Google Patents

Assembled camshaft Download PDF

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Publication number
EP0516946B1
EP0516946B1 EP92106321A EP92106321A EP0516946B1 EP 0516946 B1 EP0516946 B1 EP 0516946B1 EP 92106321 A EP92106321 A EP 92106321A EP 92106321 A EP92106321 A EP 92106321A EP 0516946 B1 EP0516946 B1 EP 0516946B1
Authority
EP
European Patent Office
Prior art keywords
shaft
cam
groove
bore
contour
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
EP92106321A
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German (de)
French (fr)
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EP0516946A1 (en
Inventor
Karl-Heinz Menzl
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.)
Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0516946A1 publication Critical patent/EP0516946A1/en
Application granted granted Critical
Publication of EP0516946B1 publication Critical patent/EP0516946B1/en
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
    • F01L1/047—Camshafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Definitions

  • the invention relates to a composite camshaft, the cams of which have a shaft through bore and have at least one groove extending from the through bore, and which are connected to the shaft in a force-locking and positive manner by expanding the shaft.
  • Such a camshaft is known from DE 34 01 057 C2. It has been shown here that unsatisfactory results are achieved when the hollow shaft is expanded due to the extreme jumps in stiffness in the transition region between the contour of the through-hole and the groove lying next to it. Although it is desirable to not only elastically but also plastically deform the shaft body in order to achieve the non-positive connection, impermissibly high deformations of the shaft material can occur in the known prior art in the above-mentioned transition region.
  • the object of the invention is therefore to demonstrate measures by means of which extremely high deformation gradients can be avoided on a composite camshaft according to the preamble of claim 1 during the manufacturing process.
  • the groove lying in the area of the cam tip merges into an opening which is widened in width, the contour of which is similar to the outer contour of the cam tip.
  • a camshaft according to the invention differs significantly from the prior art known from EP-A-0 303 845, since there the cams also have recesses, but are formed in several pieces.
  • the assembled camshaft consists of a hollow shaft 1 and at least one cam 2 placed on the hollow shaft 1, which has a shaft through bore 3 for this purpose.
  • the connection between the cam 2 and the hollow shaft 1 is made by expanding the hollow shaft 1.
  • the interior 4 of the hollow shaft 1 is subjected to high pressure, for which purpose a largely incompressible fluid is introduced during the manufacturing process.
  • the hollow shaft 1 is deformed into the plastic area, so that a non-positive connection is produced between the cams 2, which are only elastically deformed over wide areas, and the plastically deformed hollow shaft 1.
  • This non-positive connection is supported by a positive connection in the area of at least one groove 5 provided in the cam 2 and extending from the shaft passage bore 3.
  • the plastically deformed hollow shaft claws in this groove 5 so that the highest torques can be transmitted safely.
  • the groove 5 lying in the area of the cam tip 2a merges into an opening 8 widened in width b, the contour of which is similar to the outer contour of the cam tip 2a.
  • the groove 5 and the opening 8 thus form an undercut in the transition area 6 of the cam 2, which significantly reduces the stiffness jump in this area.
  • the cam 2 is also plastically deformed slightly when the hollow shaft 1 is expanded.
  • this configuration advantageously equalizes the stress distribution occurring in the cam 2. This results from the contour of the opening 8 similar to the cam tip 2a.
  • the cam 2 shown can be easily manufactured, for example, in a sintering process.
  • the shaft through bore 3 need not have a circular cross section in order to achieve the effect according to the invention.

Description

Die Erfindung betrifft eine zusammengesetzte Nockenwelle, deren eine Wellendurchgangsbohrung aufweisende Nocken zumindest eine von der Durchgangsbohrung ausgehende Nut aufweisen und die durch Aufweiten der Welle kraftschlüssig und formschlüssig mit der Welle verbunden sind.The invention relates to a composite camshaft, the cams of which have a shaft through bore and have at least one groove extending from the through bore, and which are connected to the shaft in a force-locking and positive manner by expanding the shaft.

Eine derartige Nockenwelle ist aus der DE 34 01 057 C2 bekannt. Hierbei hat sich gezeigt, daß aufgrund der extremen Steifigkeitssprünge im Übergangsbereich zwischen der Kontur der Durchgangsbohrung sowie der daneben liegenden Nut beim Aufweiten der Hohlwelle unbefriedigende Ergebnisse erzielt werden. Zwar ist es erwünscht, zur Erzielung der kraftschlüssigen Verbindung den Wellenkörper nicht nur elastisch, sondern auch plastisch zu verformen, jedoch können sich beim bekannten Stand der Technik im oben genannten Übergangsbereich unzulässig hohe Verformungen des Wellenmaterials einstellen.Such a camshaft is known from DE 34 01 057 C2. It has been shown here that unsatisfactory results are achieved when the hollow shaft is expanded due to the extreme jumps in stiffness in the transition region between the contour of the through-hole and the groove lying next to it. Although it is desirable to not only elastically but also plastically deform the shaft body in order to achieve the non-positive connection, impermissibly high deformations of the shaft material can occur in the known prior art in the above-mentioned transition region.

Aufgabe der Erfindung ist es daher, Maßnahmen aufzuzeigen, mit Hilfe derer an einer zusammengesetzten Nockenwelle nach dem Oberbegriff des Anspruchs 1 beim Fertigungsprozeß extrem hohe Verformungsgradienten vermieden werden.The object of the invention is therefore to demonstrate measures by means of which extremely high deformation gradients can be avoided on a composite camshaft according to the preamble of claim 1 during the manufacturing process.

Zur Lösung dieser Aufgabe ist vorgesehen, daß die im Bereich der Nockenspitze liegende Nut in einen in der Breite erweiterten Durchbruch übergeht, dessen Kontur der Außenkontur der Nockenspitze ähnlich ist. Dabei unterscheidet sich eine erfindungsgemäße Nockenwelle wesentlich von dem aus der EP-A-0 303 845 bekannten Stand der Technik, da dort die Nocken zwar ebenfalls Aussparungen aufweisen, dabei jedoch mehrstückig ausgebildet sind.To achieve this object, it is provided that the groove lying in the area of the cam tip merges into an opening which is widened in width, the contour of which is similar to the outer contour of the cam tip. Here, a camshaft according to the invention differs significantly from the prior art known from EP-A-0 303 845, since there the cams also have recesses, but are formed in several pieces.

Näher erläutert wird die Erfindung anhand eines bevorzugten Ausführungsbeispieles, wobei ein durch einen Nocken verlaufender Schnitt durch eine erfindungsgemäße Nockenwelle gezeigt ist.The invention is explained in more detail with reference to a preferred exemplary embodiment, a section through a camshaft through a camshaft according to the invention being shown.

Die zusammengesetzte Nockenwelle besteht aus einer Hohlwelle 1 sowie zumindest einem auf die Hohlwelle 1 aufgesetzten Nocken 2, der hierfür eine Wellendurchgangsbohrung 3 aufweist. Die Verbindung zwischen dem Nocken 2 sowie der Hohlwelle 1 erfolgt durch Aufweiten der Hohlwelle 1. Hierzu wird der Innenraum 4 der Hohlwelle 1 mit hohem Druck beaufschlagt, wozu beim Fertigungsprozeß ein weitgehend inkompressibles Fluid eingebracht wird. Hierdurch verformt sich die Hohlwelle 1 bis in den plastischen Bereich, so daß zwischen dem über weite Bereiche lediglich elastisch verformten Nocken 2 sowie der plastisch verformten Hohlwelle 1 eine kraftschlüssige Verbindung hergestellt wird.The assembled camshaft consists of a hollow shaft 1 and at least one cam 2 placed on the hollow shaft 1, which has a shaft through bore 3 for this purpose. The connection between the cam 2 and the hollow shaft 1 is made by expanding the hollow shaft 1. For this purpose, the interior 4 of the hollow shaft 1 is subjected to high pressure, for which purpose a largely incompressible fluid is introduced during the manufacturing process. As a result, the hollow shaft 1 is deformed into the plastic area, so that a non-positive connection is produced between the cams 2, which are only elastically deformed over wide areas, and the plastically deformed hollow shaft 1.

Unterstützt wird diese kraftschlüssige Verbindung durch eine formschlüssige Verbindung im Bereich zumindest einer im Nocken 2 vorgesehenen, von der Wellendurchgangsbohrung 3 ausgehenden Nut 5. In dieser Nut 5 krallt sich die plastisch verformte Hohlwelle fest, so daß sicher höchste Drehmomente übertragen werden können.This non-positive connection is supported by a positive connection in the area of at least one groove 5 provided in the cam 2 and extending from the shaft passage bore 3. The plastically deformed hollow shaft claws in this groove 5 so that the highest torques can be transmitted safely.

Jedoch könnte sich im Übergangsbereich 6 zwischen der Nut 5 sowie der die Wellendurchgangsbohrung 3 beschreibenden Innenkontur 7 des Nockens 2 aufgrund des relativ hohen Steifigkeitssprunges eine unzulässig hohe plastische Verformung der Welle 1 einstellen. Der sog. Verformungsgradient, der durch Vergleich der Wellenverformung im Bereich der Innenkontur 7 mit derjenigen im Bereich der Nut 5 gebildet wird, könnte hierbei unzulässig hoch werden.However, an inadmissibly high plastic deformation of the shaft 1 could occur in the transition region 6 between the groove 5 and the inner contour 7 of the cam 2 describing the shaft through bore 3 due to the relatively high jump in stiffness. The so-called deformation gradient, which is formed by comparing the wave deformation in the area of the inner contour 7 with that in the area of the groove 5, could become inadmissibly high.

Um hier Abhilfe zu schaffen, geht die im Bereich der Nockenspitze 2a liegende Nut 5 in einen in der Breite b erweiterten Durchbruch 8 über, dessen Kontur der Außenkontur der Nockenspitze 2a ähnlich ist. Die Nut 5 sowie der Durchbruch 8 bilden somit im Übergangsbereich 6 des Nockens 2 einen Hinterschnitt, der den Steifigkeitssprung in diesem Bereich erheblich herabsetzt. In diesem Übergangsbereich 6 wird somit beim Aufweiten der Hohlwelle 1 auch der Nocken 2 geringfügig plastisch verformt. Gleichzeitig vergleichmäßigt diese Konfiguration vorteilhafterweise die im Nocken 2 auftretende Spannungsverteilung. Dies resultiert aus der der Nockenspitze 2a ähnlichen Kontur des Durchbruchs 8.In order to remedy this, the groove 5 lying in the area of the cam tip 2a merges into an opening 8 widened in width b, the contour of which is similar to the outer contour of the cam tip 2a. The groove 5 and the opening 8 thus form an undercut in the transition area 6 of the cam 2, which significantly reduces the stiffness jump in this area. In this transition region 6, the cam 2 is also plastically deformed slightly when the hollow shaft 1 is expanded. At the same time, this configuration advantageously equalizes the stress distribution occurring in the cam 2. This results from the contour of the opening 8 similar to the cam tip 2a.

Der gezeigte Nocken 2 läßt sich beispielsweise in einem Sinterprozeß einfach fertigen. Dabei muß die Wellendurchgangsbohrung 3 keineswegs einen Kreisquerschnitt besitzen, um den erfindungsgemäßen Effekt zu erzielen.The cam 2 shown can be easily manufactured, for example, in a sintering process. The shaft through bore 3 need not have a circular cross section in order to achieve the effect according to the invention.

Claims (1)

  1. An assembled camshaft, the one-piece cams (2) of which, having a shaft through-bore (3), are provided with at least one groove (5) emerging from the through-bore (3) and are connected with the shaft (1) in a force-locking and form-locking manner by expansion of the shaft (1), characterised in that the groove (5) lying in the region of the cam tip (2a) continues into an opening (8) which is expanded in width (b), the contour of the opening being similar to the external contour of the cam tip (2a).
EP92106321A 1991-06-07 1992-04-11 Assembled camshaft Expired - Lifetime EP0516946B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4118685 1991-06-07
DE4118685A DE4118685A1 (en) 1991-06-07 1991-06-07 COMPOSED CAMSHAFT

Publications (2)

Publication Number Publication Date
EP0516946A1 EP0516946A1 (en) 1992-12-09
EP0516946B1 true EP0516946B1 (en) 1994-10-05

Family

ID=6433373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92106321A Expired - Lifetime EP0516946B1 (en) 1991-06-07 1992-04-11 Assembled camshaft

Country Status (2)

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EP (1) EP0516946B1 (en)
DE (2) DE4118685A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4323168C1 (en) * 1993-07-10 1994-09-15 Buderus Guss Gmbh Integrally cast camshaft and method for its production
DE102004011815A1 (en) 2004-03-11 2005-09-29 Daimlerchrysler Ag Camshaft and method for producing a camshaft
DE102010008566A1 (en) * 2010-02-19 2011-08-25 Neumayer Tekfor Holding GmbH, 77756 Cam for use in camshaft for controlling valve of combustion engine in motor vehicle, has units connected with each other and designed such that cavity is formed between units, where one of units is made of low carbon steel or plastic

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0303845A1 (en) * 1987-08-13 1989-02-22 Gesenkschmiede Schneider Gmbh Hollow shaft and process for producing it

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2187405A (en) * 1986-03-05 1987-09-09 Gkn Technology Ltd Securing elements on tubular members
DE3704092C1 (en) * 1987-02-10 1988-05-26 Schneider Gesenkschmiede Hollow shaft and process for its manufacture

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0303845A1 (en) * 1987-08-13 1989-02-22 Gesenkschmiede Schneider Gmbh Hollow shaft and process for producing it

Also Published As

Publication number Publication date
DE4118685A1 (en) 1992-12-10
DE59200585D1 (en) 1994-11-10
EP0516946A1 (en) 1992-12-09

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