EP0516946A1 - Arbre à cames assembli - Google Patents

Arbre à cames assembli 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)
English (en)
Other versions
EP0516946B1 (fr
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
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0516946A1 publication Critical patent/EP0516946A1/fr
Application granted granted Critical
Publication of EP0516946B1 publication Critical patent/EP0516946B1/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
    • F01L1/047—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 non-positive 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, in the known state of the art, inadmissibly high deformations of the shaft material can occur 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 a breakthrough which is wider in width and whose contour is similar to the outer contour of the cam tip.
  • 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 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.
  • 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.
  • 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.
  • 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.
  • further details may deviate from the exemplary embodiment shown, without leaving the content of the patent claim.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Gears, Cams (AREA)
EP92106321A 1991-06-07 1992-04-11 Arbre à cames assembli Expired - Lifetime EP0516946B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4118685 1991-06-07
DE4118685A DE4118685A1 (de) 1991-06-07 1991-06-07 Zusammengesetzte nockenwelle

Publications (2)

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

Family

ID=6433373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92106321A Expired - Lifetime EP0516946B1 (fr) 1991-06-07 1992-04-11 Arbre à cames assembli

Country Status (2)

Country Link
EP (1) EP0516946B1 (fr)
DE (2) DE4118685A1 (fr)

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 (de) * 1993-07-10 1994-09-15 Buderus Guss Gmbh Einstückig gegossene Nockenwelle und Verfahren zu ihrer Herstellung
DE102010008566A1 (de) * 2010-02-19 2011-08-25 Neumayer Tekfor Holding GmbH, 77756 Nocken für eine Nockenwelle und Nockenwelle

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 (fr) * 1987-02-10 1988-08-17 Gesenkschmiede Schneider Gmbh Arbre creux et son procédé de fabrication

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960014541B1 (ko) * 1987-06-25 1996-10-16 후아낙크 가부시끼가이샤 스크류 최전진위치검출장치

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 (fr) * 1987-02-10 1988-08-17 Gesenkschmiede Schneider Gmbh Arbre creux et son procédé de fabrication

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
DE4118685A1 (de) 1992-12-10
EP0516946B1 (fr) 1994-10-05
DE59200585D1 (de) 1994-11-10

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