EP0516946A1 - Assembled camshaft - Google Patents

Assembled camshaft Download PDF

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Publication number
EP0516946A1
EP0516946A1 EP92106321A EP92106321A EP0516946A1 EP 0516946 A1 EP0516946 A1 EP 0516946A1 EP 92106321 A EP92106321 A EP 92106321A EP 92106321 A EP92106321 A EP 92106321A EP 0516946 A1 EP0516946 A1 EP 0516946A1
Authority
EP
European Patent Office
Prior art keywords
shaft
cam
groove
contour
camshaft
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
EP92106321A
Other languages
German (de)
French (fr)
Other versions
EP0516946B1 (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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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

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

Abstract

A description is given of a camshaft, the cams (2) of which are connected frictionally and positively to the shaft (1) by expanding the shaft. In the region of the cam tip (2a), the cam has a groove (5) which starts from the through-hole in the shaft and merges into an opening (8) of greater width (b), the contour of which is similar to the outer contour of the cam tip (2a). By means of this configuration, large jumps in stiffness, which would cause impermissibly high deformation gradients of the shaft, are avoided.

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 non-positive 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, in the known state of the art, inadmissibly high deformations of the shaft material can occur 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.To achieve this object, it is provided that the groove lying in the area of the cam tip merges into a breakthrough which is wider in width and whose contour is similar to the outer contour of the cam tip.

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 deforms 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 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 through 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 impermissibly 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 jump in stiffness 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. Ebenso können weitere Details abweichend vom gezeigten Ausführungsbeispiel gestaltet sein, ohne den Inhalt des Patentanspruches zu verlassen.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. Likewise, further details may deviate from the exemplary embodiment shown, without leaving the content of the patent claim.

Claims (1)

Zusammengesetzte Nockenwelle, deren eine Wellen-Durchgangsbohrung (3) aufweisende Nocken (2) zumindest eine von der Durchgangsbohrung (3) ausgehende Nut (5) aufweisen, und die durch Aufweiten der Welle (1) kraftschlüssig und formschlüssig mit der Welle (1) verbunden sind, dadurch gekennzeichnet, daß die im Bereich der Nockenspitze (2a) liegende Nut (5) in einen in der Breite (b) erweiterten Durchbruch (8) übergeht, dessen Kontur der Außenkontur der Nockenspitze (2a) ähnlich ist.Composite camshaft, the cams (2) of which have a shaft through-bore (3) and have at least one groove (5) extending from the through-bore (3), and which are connected to the shaft (1) in a non-positive and positive manner by expanding the shaft (1) are characterized in that 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).
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 true EP0516946A1 (en) 1992-12-09
EP0516946B1 EP0516946B1 (en) 1994-10-05

Family

ID=6433373

Family Applications (1)

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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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7290515B2 (en) 2004-03-11 2007-11-06 Daimlerchrysler Ag Camshaft and method for producing a camshaft

Families Citing this family (2)

* 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
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 (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
EP0278292A1 (en) * 1987-02-10 1988-08-17 Gesenkschmiede Schneider Gmbh Hollow shaft and method of manufacturing it

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960014541B1 (en) * 1987-06-25 1996-10-16 후아낙크 가부시끼가이샤 Device for detecting the advanced position of screw

Patent Citations (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
EP0278292A1 (en) * 1987-02-10 1988-08-17 Gesenkschmiede Schneider Gmbh Hollow shaft and method of manufacturing it

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
EUREKA Bd. 11, Nr. 5, 1. Mai 1991, HORTON KIRBY, KENT Seite 9; 'PPS binds camshafts to cut cost, weight and excess noise' *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 109 (M-472)23. April 1986 & JP-A-60 240 363 ( MITSUBISHI KINZOKU KK ) 29. November 1985 *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 246 (M-510)23. August 1986 & JP-A-61 074 965 ( MUSASHI SEIMITSU KOGYO KK ) 17. April 1986 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7290515B2 (en) 2004-03-11 2007-11-06 Daimlerchrysler Ag Camshaft and method for producing a camshaft

Also Published As

Publication number Publication date
DE59200585D1 (en) 1994-11-10
DE4118685A1 (en) 1992-12-10
EP0516946B1 (en) 1994-10-05

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