EP0643200A1 - Nockenwelle für Brennkraftmaschine - Google Patents

Nockenwelle für Brennkraftmaschine Download PDF

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Publication number
EP0643200A1
EP0643200A1 EP94401975A EP94401975A EP0643200A1 EP 0643200 A1 EP0643200 A1 EP 0643200A1 EP 94401975 A EP94401975 A EP 94401975A EP 94401975 A EP94401975 A EP 94401975A EP 0643200 A1 EP0643200 A1 EP 0643200A1
Authority
EP
European Patent Office
Prior art keywords
cams
sleeve
shaft
inner shaft
engine
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.)
Withdrawn
Application number
EP94401975A
Other languages
English (en)
French (fr)
Inventor
Patrick Gallard
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.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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 Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0643200A1 publication Critical patent/EP0643200A1/de
Withdrawn legal-status Critical Current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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/34413—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using composite camshafts, e.g. with cams being able to move relative to the camshaft
    • 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
    • F01L2001/0471—Assembled camshafts
    • F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod

Definitions

  • the invention relates to a camshaft for an internal combustion engine intended in particular to equip a motor vehicle. It relates more particularly to a composite type camshaft comprising two interlocked shafts which can be angularly displaced with respect to each other, by a given angular value, each of these shafts supporting cams of which they are integral in rotation .
  • phase shift of the valve opening periods can be achieved relatively simply when the exhaust and intake valves of an internal combustion engine are associated with individual camshafts. This is more difficult if the opening of the intake and exhaust valves is ensured by a single camshaft.
  • European patent EP-A-254,058 discloses a camshaft of the composite type, therefore comprising two shafts rotatably mounted concentrically with one another, one of which is integral with the cams controlling the opening of the valves intake and the other, cams controlling the opening of the exhaust valves.
  • the two shafts are connected to a drive system comprising a phase shifting mechanism intended to cause the variation of the relative angular positions according to the operation of the engine.
  • the cams coupled with the inner shaft are rotatably mounted on the outer shaft which is mounted in fixed bearings in a rotatable and axially stationary manner and present in the circumferential direction of the slots which are crossed radially by fixing bolts which ensure the coupling of the cams mounted in a rotary manner on the external shaft with the internal shaft.
  • the proposed fastening system has certain drawbacks which make the use of the composite camshaft unreliable. Such a system in fact presupposes the drilling of the cams integral with the inner shaft, which is particularly difficult to achieve given the hardness of the materials used.
  • the present invention therefore proposes to remedy these drawbacks by proposing a composite camshaft comprising a system coupling cams rotatably mounted on the outer shaft with the inner shaft both extremely reliable and extremely simple to perform.
  • the composite camshaft for an internal combustion engine of the in-line multi-cylinder type represented in FIGS. 1 to 3 comprises an inner shaft 3 and a hollow outer shaft 1.
  • the outer shaft 1 which is intended to be rotatably mounted in fixed bearings of the motor concentrically houses the inner shaft 2, the latter being able to be angularly displaced relative to the outer shaft.
  • a drive system not shown, having no relation to the invention, ensures the rotation control of the two shafts, this drive system comprising a phase shifting mechanism intended to cause the rotation of the inner and outer shafts one by relative to the other on a given angle of rotation according to the operation of the engine.
  • Each of the shafts is linked to a separate group of cams intended to control the opening of the engine valves.
  • the outer shaft 1 supports the control cams of the exhaust valves not shown. These exhaust cams are secured in rotation with the outer shaft, for example by shrinking.
  • the outer shaft 1 further comprises bearing surfaces also not shown, intended to rotate in fixed bearings of the engine block to ensure the rotational guidance of the composite camshaft.
  • cams 4 and 6 for controlling the intake valves mounted free in rotation on the outer shaft 1, are they secured in rotation with the inner shaft 3.
  • the embodiment of these cams is more particularly described with regard to Figures 2 and 3.
  • the cams 4 and 6 intended to control the intake valves are carried as much as possible in groups of two on sleeves 2.
  • Each sleeve 2 is formed of an oblong part having a cylindrical central bore. It therefore supports two intake cams 4 and 6 arranged at the two axial ends on either side of a central peripheral surface of range 5.
  • This surface of range 5 is intended to be rotatably mounted in a fixed bearing of the engine block .
  • the bearing surfaces of the composite camshaft in the corresponding bearings of the engine therefore consist of bearing surfaces 5 integral with the inner shaft 3 and bearing surfaces directly integral with the shaft exterior 2.
  • the sleeve 2 is adjusted sliding on the outer shaft so as to be perfectly free to rotate and is fixed to the inner shaft 3 by means of a pin 7 consisting of a cylindrical axis which is housed respectively in a bore corresponding cylindrical 8 machined radially through the sleeve 2 and emerging at its two ends in line with the bearing surface 5, and in a corresponding cylindrical bore 10 radially passing through the internal shaft 3.
  • Recesses 9 are provided on the outer shaft 1 to allow the passage of the pin 7, the width of these recesses 9 is dimensioned to allow a certain rotation of the inner shaft 3 relative to the outer shaft 1.
  • the pin 7 passing right through the sleeve 7 and the inner shaft 3 allows a particularly solid connection of the cams 4 and 6 to the shaft 3. It is however possible to provide a fixing system using one or more pins of lesser length coming for example to be lodged in a corresponding blind hole carried by the internal shaft.
  • the positioning of the pin 7 at the level of a bearing ensures a particularly simple and effective locking of the pin, preventing any accidental withdrawal once the camshaft in place, and therefore ensures completely reliable operation unlike the aforementioned prior art in which the fixing bolts can unscrew freely under the effect of vibrations affecting the operation of the composite shaft.
  • the fixing system according to the invention makes it possible to improve the functioning of the composite shaft.
  • the lubricating oil in contact with the bearing surface 5 can penetrate via the various bores 8 and 9 at the level of the internal shaft 3, one can for example provide a longitudinal groove at the periphery of the pin 7.
  • a sleeve can be provided carrying only a cam and a bearing surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP94401975A 1993-09-09 1994-09-06 Nockenwelle für Brennkraftmaschine Withdrawn EP0643200A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9310707A FR2709786B1 (fr) 1993-09-09 1993-09-09 Arbre à cames pour moteur à combustion interne.
FR9310707 1993-09-09

Publications (1)

Publication Number Publication Date
EP0643200A1 true EP0643200A1 (de) 1995-03-15

Family

ID=9450677

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94401975A Withdrawn EP0643200A1 (de) 1993-09-09 1994-09-06 Nockenwelle für Brennkraftmaschine

Country Status (2)

Country Link
EP (1) EP0643200A1 (de)
FR (1) FR2709786B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0686754A2 (de) * 1994-05-12 1995-12-13 Carraro S.P.A. Steuervorrichtung mit einziger Welle, insbesondere für Brennkraftmaschinen
EP1362986A1 (de) * 2001-05-15 2003-11-19 Mechadyne plc Variable Nockenwelle
DE102005014680A1 (de) * 2005-02-03 2006-08-10 Mahle International Gmbh Nockenwelle mit gegeneinander verdrehbaren Nocken für insbesondere Kraftfahrzeuge
DE102005004976A1 (de) * 2005-02-04 2006-08-10 Mahle International Gmbh Nockenwelle mit gegeneinander verdrehbaren Nocken für insbesondere Kraftfahrzeugmotoren
EP1696106A1 (de) * 2005-01-19 2006-08-30 Mahle International GmbH Welleneinrichtung, insbesondere Nockenwelle von Kraftfahrzeugmotoren
EP1754913A2 (de) 2005-08-16 2007-02-21 Mahle International GmbH Gefügter, vorgefertigte Einzelnocken umfassender Mehrfachnocken

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19757504B4 (de) * 1997-12-23 2005-03-31 Daimlerchrysler Ag Gebaute Nockenwelle für eine Brennkraftmaschine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2747884A1 (de) * 1977-10-26 1979-05-03 Audi Nsu Auto Union Ag Verfahren zum steuern des betriebes einer brennkraftmaschine, sowie nach dem verfahren arbeitende brennkraftmaschine
JPS6017214A (ja) * 1983-07-11 1985-01-29 Toyota Motor Corp 内燃機関の動弁装置
WO1991005941A1 (en) * 1989-10-13 1991-05-02 Rover Group Limited An internal combustion engine camshaft drive mechanism

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2747884A1 (de) * 1977-10-26 1979-05-03 Audi Nsu Auto Union Ag Verfahren zum steuern des betriebes einer brennkraftmaschine, sowie nach dem verfahren arbeitende brennkraftmaschine
JPS6017214A (ja) * 1983-07-11 1985-01-29 Toyota Motor Corp 内燃機関の動弁装置
WO1991005941A1 (en) * 1989-10-13 1991-05-02 Rover Group Limited An internal combustion engine camshaft drive mechanism

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 9, no. 135 (M - 386) 11 June 1985 (1985-06-11) *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0686754A2 (de) * 1994-05-12 1995-12-13 Carraro S.P.A. Steuervorrichtung mit einziger Welle, insbesondere für Brennkraftmaschinen
EP0686754A3 (de) * 1994-05-12 1996-04-10 Carraro Spa Steuervorrichtung mit einziger Welle, insbesondere für Brennkraftmaschinen
EP1362986A1 (de) * 2001-05-15 2003-11-19 Mechadyne plc Variable Nockenwelle
EP1696106A1 (de) * 2005-01-19 2006-08-30 Mahle International GmbH Welleneinrichtung, insbesondere Nockenwelle von Kraftfahrzeugmotoren
US7284521B2 (en) 2005-01-19 2007-10-23 Mahle International Gmbh Shaft mechanism, in particular camshaft of automotive engines
DE102005014680A1 (de) * 2005-02-03 2006-08-10 Mahle International Gmbh Nockenwelle mit gegeneinander verdrehbaren Nocken für insbesondere Kraftfahrzeuge
US7610890B2 (en) 2005-02-03 2009-11-03 Mahle International Gmbh Camshaft with cams that can be rotated in relation to each other, especially for motor vehicles
DE102005004976A1 (de) * 2005-02-04 2006-08-10 Mahle International Gmbh Nockenwelle mit gegeneinander verdrehbaren Nocken für insbesondere Kraftfahrzeugmotoren
US7431002B2 (en) 2005-02-04 2008-10-07 Mahle International Gmbh Camshaft with contrarotating cams for automotive engines in particular
EP1754913A2 (de) 2005-08-16 2007-02-21 Mahle International GmbH Gefügter, vorgefertigte Einzelnocken umfassender Mehrfachnocken
EP1754913A3 (de) * 2005-08-16 2008-07-16 Mahle International GmbH Gefügter, vorgefertigte Einzelnocken umfassender Mehrfachnocken
US9709152B2 (en) 2005-08-16 2017-07-18 Mahle International Gmbh Joined multiple cam comprising individual prefabricated cams

Also Published As

Publication number Publication date
FR2709786B1 (fr) 1995-11-17
FR2709786A1 (fr) 1995-03-17

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