EP1580405B1 - Actionneur de soupapes desmodromique - Google Patents

Actionneur de soupapes desmodromique Download PDF

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Publication number
EP1580405B1
EP1580405B1 EP05006467A EP05006467A EP1580405B1 EP 1580405 B1 EP1580405 B1 EP 1580405B1 EP 05006467 A EP05006467 A EP 05006467A EP 05006467 A EP05006467 A EP 05006467A EP 1580405 B1 EP1580405 B1 EP 1580405B1
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EP
European Patent Office
Prior art keywords
valve
intermediate member
drive according
head
valve stem
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.)
Not-in-force
Application number
EP05006467A
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German (de)
English (en)
Other versions
EP1580405A1 (fr
Inventor
Stefan Battlogg
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
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1580405A1 publication Critical patent/EP1580405A1/fr
Application granted granted Critical
Publication of EP1580405B1 publication Critical patent/EP1580405B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01L1/30—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of positively opened and closed valves, i.e. desmodromic valves
    • 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
    • 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
    • F01L1/08—Shape of cams
    • 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01L13/0005—Deactivating valves
    • 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
    • F01L2301/00—Using particular materials
    • 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
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • the invention relates to a valve train for an internal combustion engine, with at least one driven cam element, the at least one valve forcibly opens and closes, wherein between the cam member and the valve stem at least one pivotable in a bearing intermediate member is provided.
  • cam member is provided with a lateral groove, in which engages the head of the valve stem, or with a lateral web, which is encompassed by the head of the valve stem.
  • Desmodromic valve trains are also known with an intermediate member between the cam member and the valve stem, for example from the GB 809,027 or the EP 1 205 643 ,
  • the latter shows a toggle lever as an intermediate member, and the valve lift can be changed by pivoting the bearing of the first lever of the toggle lever on a circular arc. A complete shutdown of the valve can not be achieved.
  • the invention now proposes that the bearing of the intermediate member is arranged approximately parallel to the valve stem adjustable, and that the valve is thereby silently laid, that the bearing is released and the lifting component of the movable connection between the intermediate member and the valve is locked.
  • a shutdown of a valve or an associated cylinder of the internal combustion engine can be done because the pivot axis is changed, so instead of the valve, the stock up and down is moved.
  • degrees of freedom and attitudes without the forced guidance must be given up.
  • the forcibly guided valve stem may be rotatably supported about its longitudinal axis by the intermediate member.
  • the rotatable attitude allows the valve stem to rotate under the influence of non-longitudinal forces, thereby providing more balanced loading and wear of the valve stem and its guide in the cylinder head.
  • the valve stem may have a rotationally symmetrical head, in particular a ball head, which is mounted in a receptacle of the intermediate member.
  • a play-free ball joint-like connection of the valve stem to the moving on the arc intermediate member is possible with selection of a suitable elastic valve material, so that the shaft can bend slightly.
  • the intermediate member has a receptacle for the head of the valve stem, which allows a compensating movement in the longitudinal direction of the intermediate member.
  • the receptacle represents, in particular, a part of an undercut groove extending in the longitudinal direction of the intermediate member, which can be open towards the free end.
  • the intermediate member has two interconnected tabs, which have mutually complementary to a receptacle for the head of the valve stem recesses.
  • the intermediate member is preferably connected to the enclosing element by means of a bearing pin which is arranged parallel to the axis of rotation of the cam element.
  • the flexible enclosing element can therefore in particular have chain links, wherein the bearing pin forms a bolt of the chain.
  • the enclosing element may form a closed chain, with the cam element circulating between the link plates. But it is also possible that chain links are provided only in the connection area with the enclosing element, and the remaining portion of the enclosing element is formed from a band or the like.
  • a further preferred embodiment provides that the two straps of the intermediate link each have an eyelet which engage between the link plates and are penetrated by a pin of the chain.
  • the two eyelets can embrace the link plates from the outside fork-shaped.
  • the valve trains shown in the figures each have a camshaft having a cylindrical or hollow cylindrical support rod and at least one cam member 2 which is rotatably mounted on the support rod.
  • the cam element 2 has a cam region 3 and a base circle region 4 which is concentric with the support rod (FIG. 1) and extends over the greater part of the circumference of the cam element 2 in the exemplary embodiments shown.
  • the axis of rotation of the support rod and the cam elements 2 is denoted by 1.
  • the valve 7 has a valve stem 8, at the lower end of which a valve disk is provided, and which is slidably guided in a guide held in the cylinder head 5 or the like.
  • the head 9 of the valve stem 8 is rotationally symmetrical, for example, a ball head, and freely rotatably mounted in a receptacle 12 of an intermediate member 11 about the longitudinal axis 6.
  • the valve 7 can thus respond to various loads during opening and closing in such a way that it twists. This avoids prematurely unilateral wear in the leadership of the cylinder head 5 and the receptacle 12 of the intermediate member 11, and Abnweilened in the valve seat.
  • the intermediate member 11 is pivotally mounted in a bearing 22, which preferably also has a trained as a ball head bearing head 23.
  • This bearing may also have a hinge pin. The like., Or be executed differently, as will be explained below.
  • the intermediate member 11 abuts the peripheral surface 3, 4 of the cam member 2, so that it is pivoted by the rotation of the cam member 2 in the bearing 22 back and forth.
  • the bearing 22 can also be adjustable to compensate for tolerances of the individual parts and to adjust them. The adjustment can be mechanical, hydraulic or otherwise.
  • cam element 2 is surrounded by a flexible, as inelastic encircling element 25 on which a bearing pin 14 is provided.
  • the enclosing element 25 rests substantially free of play on the circumference of the cam member 2, and consists in particular od of a chain.
  • Whose members 26 are hinged together. It can also from a low-friction material band, for example a steel band, a fiber-reinforced textile loop in the circumferential direction or the like, or be formed from a combination of these two elements.
  • a fiber-reinforced fabric loop is produced in particular in a textile rotary work technique (circular weaving etc.), and contains, for example, aramid fibers or the like as circumferentially extending threads which have a high length consistency and temperature resistance.
  • the cam member 2 rotates in the enclosing member 25, the cam portion 3 generates a circumferential recess or bulge of the enclosing element, which causes a pivoting of the intermediate member 11, so that the intermediate member movably held valve 7 is moved downwards and opened, and after passage of the cam portion 3 pulled back up and closed.
  • a light spring surrounding the valve stem 8 does not serve to return the valve, but secures the closed position of the valve in the base circle region.
  • the spring serves as a locking spring, in particular to compensate for thermally induced changes and tolerances.
  • the intermediate member 11 is a drag lever, which is pivotally mounted at one end on the cylinder head 5 in the bearing 22.
  • the bearing 22 is provided in this embodiment with a spherical bearing head 23 which is mounted in a spherical receptacle 19, so that the valve 7 connected to the second end of the intermediate member 11 moves on a circular arc. Since the valve stem 8 in its guide in the cylinder head 5 moves in a straight line, a ball joint between the head 9 and the intermediate member would bend the valve stem 8 (in the drawing to the left). This is indeed feasible with appropriate choice of material for the valve stem 8, but much cheaper is the embodiment shown in Fig.
  • the leaf spring 30 thus fulfills the function of a valve clearance compensation.
  • Fig. 3 shows an embodiment in which the valve stem 8 is connected to the intermediate member 11 via a second intermediate member forming the handlebar 10, so that the joints need no compensation game.
  • the receptacle 12 and arranged on the handlebar 10 head 31 also form a backlash-free ball joint as shown in this embodiment on the valve stem 8 receptacle 32 with the second head 31 of the handlebar 10.
  • the valve stem 8 could of course, as in the other embodiments with the head Be provided 9, so that the handlebar 10 on one side a head 31 and on the other side the receptacle 32 has.
  • Fig. 4 shows an embodiment of the invention, which allows the shutdown of the valve 7 despite rotating camshaft, and therefore can be used to shut off a valve or cylinder.
  • Trained as a drag lever intermediate member 11 is pivotable as well as in the embodiment of FIG. 1 in the bearing 22 and provided with a game having receptacle 12 in which the head 9 can move.
  • the bearing 22 is adjustable in this embodiment in the cylinder head 5, and is od in the functional position by a latch 24.
  • the bolt 24 is moved out of its engagement with the bearing 22, whereupon the bearing 22 can move approximately parallel to the valve stem 8.
  • the end of the intermediate member 11 connected to the valve stem 8 is fixed by means of a second latch 29 or the like in the closed position.
  • the cam member 2 continues to move the intermediate member 11, however, the pivot axis has changed and is now set by the bolt 29 while the bearing 22 is moved up and down.
  • a common locking device may be provided which holds either the valve 7 or the bearing 22 or releases. If a spring 34 is used (FIGS. 13, 16), then the latch 29 may possibly also be omitted, since the spring 34 holds the valve in the closed position when the bearing 22 is moved up and down.
  • the intermediate member 11 is composed of two mirror-inverted tabs 13, the center each have a mounting opening 18 for a not-shown connecting element (screw, Rivets od. Like.) Have.
  • each tab 13 is provided with an eyelet 17 having a second opening, the eyelet 17 protrudes from the longitudinal extension of the tabs 13, and is mounted on the bearing pin 14 which connects two chain links 26 in the enclosing element 25.
  • Fig. 6 shows an embodiment in which the tabs 13 engage over the middle like outwardly like a fork.
  • An embodiment in which the eyelets 17 intervene in place of the usually provided there roller 27 between the tabs of the chain links 26 is also possible.
  • Fig. 5 shows the inside of the tab 13 in the orientation of FIG. 1.
  • Left is the receptacle 12 for the head 9 of the valve stem 8, and on the right is the receptacle 19 for the head 23 of the bearing 22 is shown.
  • the receptacle 12 comprises the space required in the longitudinal extent of the intermediate member 11 for the migration of the head 9.
  • the receptacle 12 is formed by an elongated end rounded recess 15 which is open to receive the valve stem 8, and opened towards the end can. At the top of an opening 16 is provided.
  • the receptacle 19 has a hemispherical recess 20 for the bearing head 23, and is also open at the bottom.
  • a lubricant in particular oil can be introduced into the receptacle 19 under pressure through the spray openings 21 at the top against the chain links 26 of the Enclosing element 25 and the bearing pin 14 injects.
  • a portion of the sprayed lubricant is trapped in the mentioned opening 16 of the receptacle 12 and flows into the recess 15 to the head 9 of the valve stem 8 and on to its leadership in the cylinder head 5. It will therefore be lubricated in a simple manner, all moving parts of the valve train.
  • the intermediate member 11 could also be made of a one-piece, substantially flat, sheet metal stamping on which the two tabs 13 are integrally formed on a connecting web, and are folded against each other, at the same time the two heads 9 and 31 are inserted. The two tabs 13 are then fixed in this position (welded, screwed, riveted od. Like.).
  • the intermediate member 11 is formed as a rocker arm, wherein the bearing 22 and the connection point with the cam member 2 are arranged reversed.
  • Fig. 8 shows in section an embodiment of the in Fig. 1 to 4 and 7 schematically illustrated head 9 of the valve stem 8, at its upper end three annular grooves are provided.
  • the spherical head 9 is formed from two parts 33, on which respective webs 41 are provided, which engage in annular grooves of the valve stem 8.
  • FIG. 9 to 11 show a further embodiment in which the free end of the intermediate member 11 is fork-shaped and has two mutually parallel webs 35 which engage under the head 9 of the valve stem 8.
  • Another web 36 of the intermediate member 11 extends above the head 9, which is cylindrical in this embodiment and is arranged on the valve stem 8 hammerhead-like.
  • the fork-shaped end of the intermediate member 11 is pivotable relative to the valve stem 8 and slidable in the longitudinal direction of the intermediate member 11.
  • an annular groove is formed on the latter, as can be seen in FIG. 1, in each of which a web 41 engages.
  • the webs are provided on parts 33 which complement each other to a conical sleeve which is held in a conical bore of the head 9.
  • Fig. 12 shows a variant of the connection region between the intermediate member 11 and the valve stem 8, in which the free end of the intermediate member 11 a rounded pin 40 which engages in an eyelet in the head 9 of the valve stem.
  • the valve stem 8 is similar to FIG. 11 via a two-part conical sleeve with webs 41 which engage in an annular groove of the valve stem 8, rotatably connected to the head 9.
  • Figs. 13 and 14 show an embodiment in which the valve head holder is similar to that shown in Fig. 12, but with an additional shim 48 is provided.
  • the intermediate member 11 abuts with a roller 37 on the circumference of the cam member 2, and for reasons of clarity, only two hinge pins 31 are shown by the enclosing element formed by a chain 25.
  • the intermediate member 11 has at the end opposite the pin 40 on a hemispherical recess having receptacle 19 for the bearing head 23 which is rotatably supported in the height-adjustable bearing 22.
  • the bearing head 23, which can be supplied with lubricating oil via an only indicated oil supply channel, has an upwardly projecting threaded pin 43, which passes through a bore in the intermediate member 11 and is secured adjustable by a threaded nut 49.
  • Fig. 15 shows a further embodiment of the height-adjustable mounting of the intermediate member 11.
  • the bearing head 23 has an eye 46, is arranged with a threaded end portion in the bearing 22 and in turn secured by a threaded nut 49. An accessible via a bore 44 screw 47 is used for adjustment and clamping in the bearing 22.
  • the eye 46 is penetrated by a bearing pin 45 which is arranged in the fork-shaped receptacle 19 of the intermediate member 11 and the pivoting of the intermediate member 11 allows.
  • Fig. 16 shows an oblique view of an embodiment in which the valve-side connection similar to FIG. 12 is provided, and which comprises the cylinder head 5 adjustable bearing 22, and has, as shown in FIG. 17, an adjustable bearing head 23 which in the spherical Recording 19 of the intermediate member 11 is rotatably mounted.
  • the adjustment of the bearing head 23 by means of a screw 47 which is accessible through the bore 44.

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

Claims (16)

  1. Commande de soupape pour un moteur à combustion interne, avec au moins un élément à came (2) entraîné qui ouvre et ferme au moins une soupape (7), entre l'élément à came (2) et la tige de soupape (8) étant prévu au moins un élément intermédiaire (11) pivotant dans un palier (22), caractérisée en ce que le palier (22) est disposé de manière réglable, sensiblement parallèle à la tige de soupape (8), en ce que la soupape (7) peut ainsi être immobilisée, en ce que le palier (22) est libéré et en ce que la composante de levée de la liaison mobile entre l'élément intermédiaire (11) et la soupape (7) est bloquée.
  2. Commande de soupape selon la revendication 1, caractérisée en ce que l'élément à came (2) est disposé de manière rotative dans un élément enveloppant (25) flexible et en ce que l'élément enveloppant (25) est relié de manière mobile à la tige de soupape (8) de la soupape (7), à l'aide dudit au moins un élément intermédiaire (11).
  3. Commande de soupape selon les revendications 1 ou 2, caractérisée en ce que la tige de soupape (8) est maintenue sur l'élément intermédiaire (11) de manière rotative autour de son axe longitudinal (4).
  4. Commande de soupape selon, les revendications 1 à 3, caractérisée en ce que l'élément intermédiaire (11) comporte un logement (12) pour la tête (9) de la tige de soupape (8), qui autorise un mouvement de compensation dans le sens longitudinal de l'élément intermédiaire (11).
  5. Commande de soupape selon la revendication 4, caractérisée en ce que l'élément intermédiaire comprend deux pattes (13) reliées ensemble qui présentent des cavités (15) se complétant entre elles, vers le logement (12) de la tête (9) de la tige de soupape (8).
  6. Commande de soupape selon les revendications 4 ou 5, caractérisée en ce que le logement (12) est découpé à l'arrière et ouvert du côté de l'extrémité libre.
  7. Commande de soupape selon les revendications 3 à 8, caractérisée en ce que la tige de soupape (8) présente une tête (9) à symétrie de révolution.
  8. Commande de soupape selon les revendications 3 à 7, caractérisée en ce que la tête (9) est une tête sphérique.
  9. Commande de soupape selon les revendications 1. à 3, caractérisée en ce qu'entre la tige de soupape (8) et l'extrémité libre de l'élément intermédiaire (11) est prévue une complémentarité de forme avec compensation du mouvement dans le sens longitudinal de l'élément intermédiaire (11), l'extrémité de l'élément intermédiaire (11) étant guidée sur la tête (9) de la tige de soupape (8) de manière rotative et réglable.
  10. Commande de soupape selon la revendication 9, caractérisée en ce que l'extrémité de l'élément intermédiaire (11) est conformée en tenon (40) qui s'engage dans un anneau prévu dans la tête (9) de la tige de soupape (8).
  11. Commande de soupape selon la revendication 9, caractérisée en ce que l'extrémité de l'élément intermédiaire (11) est conformée en fourche et comporte deux branches (35) parallèles entre elles qui saisissent la tête (9) de la tige de soupape (8).
  12. Commande de soupape selon la revendication 10 ou 11, caractérisée en ce que l'extrémité de l'élément intermédiaire (11) est arrondie.
  13. Commande de soupape selon les revendications 2 à 12, caractérisée en ce que l'élément intermédiaire (11) est relié à l'élément enveloppant (25) au moyen d'un tenon (14) qui est disposé parallèlement à l'axe de rotation (1) de l'élément à came (2).
  14. Commande de soupape selon la revendications 13, caractérisée en ce que l'élément enveloppant (25) flexible présente des maillons de chaîne (26), le tenon (14) reliant deux cylindres à chaîne (26).
  15. Commande de soupape selon les revendications 5 et 13, caractérisée en ce que les deux pattes de l'élément intermédiaire (11) comportent chacune un anneau (17) qui est traversé par le tenon (14).
  16. Commande de soupape selon les revendications 1 à 15, caractérisée en ce que l'élément intermédiaire (11) est logé sur la tête du cylindre (5), comprimé par un ressort dans le sens de fermeture de la soupape (7).
EP05006467A 2004-03-26 2005-03-24 Actionneur de soupapes desmodromique Not-in-force EP1580405B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT5482004 2004-03-26
AT5482004 2004-03-26

Publications (2)

Publication Number Publication Date
EP1580405A1 EP1580405A1 (fr) 2005-09-28
EP1580405B1 true EP1580405B1 (fr) 2007-11-21

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Application Number Title Priority Date Filing Date
EP05006467A Not-in-force EP1580405B1 (fr) 2004-03-26 2005-03-24 Actionneur de soupapes desmodromique

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EP (1) EP1580405B1 (fr)
DE (1) DE502005002015D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004029621B4 (de) * 2004-06-18 2006-09-07 Dr.Ing.H.C. F. Porsche Ag Ventiltrieb für eine Brennkraftmaschine
WO2019130364A1 (fr) 2017-12-29 2019-07-04 Carlo Giacone Système de commande, d'entraînement et de vérification pour vannes de machine

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1671973A (en) * 1926-04-10 1928-06-05 Russell T Anderson Rocker arm and cam assembly for internal-combustion engines
GB809027A (en) * 1955-07-29 1959-02-18 Joseph Henry Suckling Improvements relating to valve operating mechanism for internal combustion engines
GB1369597A (en) * 1970-10-17 1974-10-09 Snell A J Valve gear
JPS6081411A (ja) * 1983-10-07 1985-05-09 Honda Motor Co Ltd 内燃機関の弁強制開閉装置
JPS60128915A (ja) * 1983-12-17 1985-07-10 Honda Motor Co Ltd 多気筒内燃機関の弁作動休止装置
IT1190034B (it) * 1986-06-05 1988-02-10 Ducati Meccanica Spa Testa a quattro valvole a comando desmodromico per motori a scoppio
US20030159667A1 (en) * 1997-02-13 2003-08-28 Armstrong Mark Frederick Adjustment mechanism for valves
EP1206629A1 (fr) * 1999-08-12 2002-05-22 Stefan Battlogg Commande de soupape, en particulier pour moteurs a combustion interne de vehicules
EP1205643A1 (fr) * 2000-11-13 2002-05-15 Stefan Battlogg Dispositif d'actionnement de soupapes de moteur à combustion interne
EP1277921B1 (fr) * 2001-07-19 2004-07-07 Ducati Motor Holding S.p.A. Assortiment de culasses avec un dispositif de commande des soupapes desmodromique, pour moteurs à combustion interne
WO2003083269A1 (fr) * 2002-03-28 2003-10-09 Stefan Battlogg Dispositif pour transformer un mouvement rotatoire en un mouvement de va-et-vient

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DE502005002015D1 (de) 2008-01-03
EP1580405A1 (fr) 2005-09-28

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