EP0594104A1 - Arbre à came à levée d'admission variable par déplacement de la came perpendiculairement à son axe - Google Patents

Arbre à came à levée d'admission variable par déplacement de la came perpendiculairement à son axe Download PDF

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Publication number
EP0594104A1
EP0594104A1 EP93116796A EP93116796A EP0594104A1 EP 0594104 A1 EP0594104 A1 EP 0594104A1 EP 93116796 A EP93116796 A EP 93116796A EP 93116796 A EP93116796 A EP 93116796A EP 0594104 A1 EP0594104 A1 EP 0594104A1
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EP
European Patent Office
Prior art keywords
camshaft
rear axle
axis
cam
rotation
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Withdrawn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
EP93116796A
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German (de)
English (en)
Inventor
Aldo Ranzoni
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0594104A1 publication Critical patent/EP0594104A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0057—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by splittable or deformable cams

Definitions

  • the present invention relates to the field of devices (internal combustion engine, compressor) which operate on the basis of thermodynamic gas conversion, which, with or without a mixture of flammable substances, are subjected to cycles which include their compression and subsequent re-expansion, as defined in the preamble of claim 1 is described.
  • the torque curve that can be achieved by a multi-valve engine is, despite everything, not excellent due to a whole range of secondary causes, which are related, among other things, to the ignition and combustion time and the process of gas inertia, and does not meet the requirements of the individual cases.
  • the devices in fact almost always require the use of profile-shaped cams that slide along their axis of rotation, or pairs of cams of different flanked profiles, of which only one, depending on the axial sliding position of the camshaft, actuates the relative valve .
  • valve opening can be regulated in two specific stages, which is unsuitable for achieving a satisfactory correction of the torque curve.
  • the inventor of the present invention intended to find a solution to the operational and operational problems of execution costs and has designed a camshaft for a variable intake stroke of the valve opening in question, due to the cam displacement, especially those that actuate the intake valves, in the direction perpendicular to the axis of rotation the camshaft is reached so that the actual valve lift can be varied continuously and with the desired engagement curves.
  • the invention has the subject of a camshaft for actuating an internal combustion engine or compressor in operation with a variable inlet stroke of the valves and is characterized in that it is equipped with the necessary means for varying the inlet stroke, at least the part of each cam which actuates the relative valve is displaced in a substantially perpendicular direction to the axis of rotation of the camshaft and of the actual cam.
  • the inner rear axle shaft in accordance with each cam 4, has a barrel 3 'with an inclined axis in comparison with the axis of the camshaft 1 in its entirety.
  • the relative cam 4, i.e. its operational part 4 ' is coupled to said inclined barrel 3' through a hole 5 which has the same inclination so that it remains fixed in rotation with the inner rear axle shaft 3, i.e. finally with the camshaft 1.
  • the inner rear axle shaft 3 shifts axially and the cam 4 or better due to the inclinations described above its operative part 4 ', which actuates the valve 6, shifts in the direction perpendicular to its axis of rotation.
  • the projection of the cam 4 relative to the shaft 1 thus changes, and thus the times and the drive run of the valve change, with which the desired result is achieved.
  • the axial displacement of the inner rear axle shaft 3 can be carried out by hydraulic fluid which exerts an impact on the shaft, for example in FIG. 1, where a double-effect piston 7, which is fixed to the rear axle shaft, was used for this purpose.
  • the part 4 'of the cam which does not produce any displacement of the valve 6 with its profile, is fixed and worked out in the outer rear axle shaft.
  • the inner rear axle shaft 3 is made up of several segments 3, 33, which are connected to one another in such a way that they form a solid piece, and the cams are inserted on each of its inclined runs 3 '.
  • this connection is achieved by a system of threaded rods 8.
  • Fig. 2 and 3 also show a cam with a frontal view and cross section and you can see from this how the operative part 4 'of the cam itself 4 perpendicular to its axis of rotation in guides 9 which are on the outer rear axle shaft 2 are attached up to its max. Deflection position (on the order of a few mm) can slide.
  • FIGS. 4, 5 and 6 Another embodiment of the invention is shown in FIGS. 4, 5 and 6.
  • each operative part 4 ′ of the cam 4 in the direction perpendicular to its axis of rotation is achieved by the relative sliding between two planes 10, 11, which are inclined compared to the camshaft axis 1, one of which 11 is a one-piece piece with the inner rear axle shaft 3 forms, since it is worked out in the recess 3 'of the rear axle shaft 3 and the other 10 is worked out on a link 12 connected to said part 4' of the cam. Both surfaces 10, 11 have the same inclination.
  • a spring 15 or another equivalent spring element is attached, which with its resistance to compression guarantees the continuous contact between the two inclined planes 10, 11 and this with automatic compensation of the game.
  • the skewed member connected to the cam is a slide shoe 16.
  • the axial runs of the inner rear axle shaft 3 can be carried out with the systems already described during the rotation of the camshaft 1.
  • the solution can be implemented with the paired inclined planes without the rear axle shaft 2 having to be implemented from a plurality of segments in order to use the cams.
  • the proposed angle for the mentioned inclinations in the first as well as in the second embodiment is approximately 7 °.
  • the operative part 4 'of the cam 4 is displaced in the direction perpendicular to the axis of rotation of the shaft 1 by sliding along the guides 17 which have been worked out on the shaft and which also serve as a stop by exerting pressure.
  • the pressure is exerted directly, or indirectly by a worked-out member 18, by means of a liquid, such as. Example oil pressure.
  • a spring 19 or another compression spring element is attached between the abovementioned stop 17 and the link 18, which guarantees the return stroke of the cam.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
EP93116796A 1992-10-23 1993-10-18 Arbre à came à levée d'admission variable par déplacement de la came perpendiculairement à son axe Withdrawn EP0594104A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3294/92 1992-10-23
CH329492 1992-10-23

Publications (1)

Publication Number Publication Date
EP0594104A1 true EP0594104A1 (fr) 1994-04-27

Family

ID=4252871

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93116796A Withdrawn EP0594104A1 (fr) 1992-10-23 1993-10-18 Arbre à came à levée d'admission variable par déplacement de la came perpendiculairement à son axe

Country Status (1)

Country Link
EP (1) EP0594104A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996030630A1 (fr) * 1995-03-30 1996-10-03 Ab Volvo Mecanisme a soupapes dans un moteur a combustion interne
US5855190A (en) * 1996-09-24 1999-01-05 Yamaha Hatsudoki Kabushiki Kaisha Valve-actuating variable cam for engine
WO1999023362A1 (fr) * 1997-11-03 1999-05-14 Mechadyne International Plc Mecanisme de changement de phase
WO1999023361A1 (fr) * 1997-11-03 1999-05-14 Mechadyne International Plc Mecanisme de changement de phase
EP1030035A3 (fr) * 1999-02-18 2000-10-11 Mechadyne PLC Déphaseur
FR2855094A1 (fr) * 2003-05-20 2004-11-26 Medelco Installation pour la realisation d'un produit solide a partir d'un materiau pulverulent

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR569928A (fr) * 1923-08-20 1924-04-19 Dispositif de commande de cames
US2888837A (en) * 1957-02-28 1959-06-02 Carl S Hellmann Adjustable cam mechanism
US3523465A (en) * 1968-10-31 1970-08-11 William Emory Harrell Adjustable cam shafts
DE3720947A1 (de) * 1986-07-03 1988-01-07 Volkswagen Ag Nockenwellenanordnung
DE3705128A1 (de) * 1987-02-18 1988-09-01 Opel Adam Ag Fuer eine brennkraftmaschine bestimmte nockenwelle
EP0397540A1 (fr) * 1989-03-17 1990-11-14 Regie Nationale Des Usines Renault Arbre à cames pour moteur à distribution variable

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR569928A (fr) * 1923-08-20 1924-04-19 Dispositif de commande de cames
US2888837A (en) * 1957-02-28 1959-06-02 Carl S Hellmann Adjustable cam mechanism
US3523465A (en) * 1968-10-31 1970-08-11 William Emory Harrell Adjustable cam shafts
DE3720947A1 (de) * 1986-07-03 1988-01-07 Volkswagen Ag Nockenwellenanordnung
DE3705128A1 (de) * 1987-02-18 1988-09-01 Opel Adam Ag Fuer eine brennkraftmaschine bestimmte nockenwelle
EP0397540A1 (fr) * 1989-03-17 1990-11-14 Regie Nationale Des Usines Renault Arbre à cames pour moteur à distribution variable

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996030630A1 (fr) * 1995-03-30 1996-10-03 Ab Volvo Mecanisme a soupapes dans un moteur a combustion interne
US5806476A (en) * 1995-03-30 1998-09-15 Ab Volvo Valve mechanism in an internal combustion engine
US5855190A (en) * 1996-09-24 1999-01-05 Yamaha Hatsudoki Kabushiki Kaisha Valve-actuating variable cam for engine
WO1999023362A1 (fr) * 1997-11-03 1999-05-14 Mechadyne International Plc Mecanisme de changement de phase
WO1999023361A1 (fr) * 1997-11-03 1999-05-14 Mechadyne International Plc Mecanisme de changement de phase
US6263845B1 (en) 1997-11-03 2001-07-24 Mechadyne Plc Phase change mechanism
EP1030035A3 (fr) * 1999-02-18 2000-10-11 Mechadyne PLC Déphaseur
FR2855094A1 (fr) * 2003-05-20 2004-11-26 Medelco Installation pour la realisation d'un produit solide a partir d'un materiau pulverulent
WO2004103689A1 (fr) * 2003-05-20 2004-12-02 Medelco Installation pour la realisation d'un produit solide a partir d'un materiau pulverulent
US7517204B2 (en) 2003-05-20 2009-04-14 Medelco System for producing a solid product from a powdery material

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