EP1580405A1 - Actionneur de soupapes desmodromique - Google Patents

Actionneur de soupapes desmodromique Download PDF

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Publication number
EP1580405A1
EP1580405A1 EP05006467A EP05006467A EP1580405A1 EP 1580405 A1 EP1580405 A1 EP 1580405A1 EP 05006467 A EP05006467 A EP 05006467A EP 05006467 A EP05006467 A EP 05006467A EP 1580405 A1 EP1580405 A1 EP 1580405A1
Authority
EP
European Patent Office
Prior art keywords
intermediate member
valve
head
gear according
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.)
Granted
Application number
EP05006467A
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German (de)
English (en)
Other versions
EP1580405B1 (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
Expired - Fee Related 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.
  • Older examples of a desmodronic valve train show the US 2,858,818 or DE 537 556.
  • the invention now proposes that between the cam member and the Valve stem is provided at least one pivotable intermediate member.
  • the Formation of an intermediate member in the Zwangs foundedüngskette between the cam and the valve creates opportunities for degrees of freedom and settings without that the forced guidance must be given up.
  • the positively driven valve stem can be rotated about its longitudinal axis be held by the intermediate member.
  • the rotatable posture allows the valve stem to to twist under the influence of non-longitudinal forces, whereby a more balanced load and wear of the valve stem and its Guidance in the cylinder head is achieved.
  • the Ventitschaft a rotationally symmetrical Head, in particular a ball head, in a receptacle of the intermediate member is mounted.
  • the connected to the enclosing element Intermediate member which is preferably pivotable about a bearing axis, in particular a drag lever mounted at one end or an approximately centrally mounted Rocker arm, so that acting on the valve stem end of the intermediate member moves under the influence of the cam element on a circular arc.
  • a backlash-free ball joint connection of the valve stem to that on the circular arc Moving pontic is selecting a suitable elastic Valve material possible, so that the shaft can bend slightly.
  • Another embodiment provides two intermediate links, of which the first pivotally mounted and connected to the enclosing element, and the second is provided between the first intermediate member and the valve stem, wherein the two intermediate links by means of a ball joint or a bearing pin are connected.
  • a preferred embodiment with only one intermediate member provides that the Intermediate member has a receptacle for the head of the valve stem, the one Compensation movement in the longitudinal direction of the intermediate member permits.
  • the recording in particular, forms a part of itself in the longitudinal direction of the intermediate member extending undercut groove, which may be open to the free end.
  • the intermediate member two with each other connected tabs on each other to a receptacle for the head of Valve stem have complementary recesses.
  • the intermediate member with the Enclosing element preferably connected by means of a bearing pin which is parallel to Rotary axis of the cam element is arranged.
  • the flexible enclosing element Therefore, in particular chain links, wherein the bearing pin is a bolt the chain forms.
  • the enclosing element can form a closed chain, wherein the cam member rotates between the link plates. But it is the same possible that only in the connection area with the enclosing chain links are provided, and the remaining portion of the enclosing element a band od. Like. Is formed.
  • the enclosing element is a chain or at least two chain links has a further preferred embodiment that the two tabs of the intermediate member each have an eyelet which engage between the link plates and are interspersed by a bolt of the chain- The two eyelets can Also grip the link plates from the outside in a forked way.
  • valve drive By means of the valve drive according to the invention can also be a shutdown of a valve or an associated cylinder of the internal combustion engine, if the Bearing axis of the intermediate member arranged approximately parallel to the valve stem adjustable is and the lifting component of the movable connection between the intermediate member and the valve is lockable.
  • the valve trains according to the invention have a camshaft which has a cylindrical or hollow cylindrical support rod and at least one cam element. 2 has, which is arranged rotationally fixed on the support rod.
  • the cam element 2 has a cam portion 3 and a support rod concentric to the base circle area. 4 on (Fig. 1), which in the embodiments shown on the larger part the circumference of the cam member 2 extends.
  • the axis of rotation of the support rod and the cam elements 2 is designated 1.
  • the valve 7 has a Ventitschaft 8, at the lower end of a valve plate is provided, and in a in the Cylinder head 5 or the like held guide is slidably guided.
  • the head 9 of the valve stem 8 is rotationally symmetrical, for example a ball head, and in a receptacle 12 of an intermediate member 11 freely rotatable about the longitudinal axis 6 stored.
  • the valve 7 can thus at different loads during opening and closing in such a way that it twists. This avoids premature one-sided Abnweilungen in the leadership of the cylinder head 5 and the receptacle 12 of the Intermediate member 11, as well as wear in the valve seat.
  • the intermediate member 11 is pivotally mounted in a bearing 22, which is preferred also has a trained as a ball head bearing head 23.
  • This camp can Also od a hinge pin. Like. Have, or be executed differently, as continue will be explained below.
  • the intermediate member 11 is located on the peripheral surface 3, 4 of the Cam element 2, so that it by the rotation of the cam member 2 in the camp 22 is pivoted back and forth.
  • the bearing 22 may also be adjustable to To compensate for tolerances of the individual parts and to adjust them.
  • the attitude can be done mechanically, hydraulically or otherwise.
  • the cam element 2 is surrounded by a flexible, surrounded as inelastic enclosure member 25 is at the one Bearing pin 14 is provided.
  • the enclosing element 25 is substantially clearance on the circumference of the cam member 2, and consists as shown in FIG. 1, in particular from a chain od.
  • the members 26 hinged together are. It can also be made of a low-friction material band, for example a steel strip, a fiber-reinforced in the circumferential direction fabric loop od. Like., or be formed of a combination of these two elements.
  • a fiber reinforced Fabric loop is especially in a textile round work technique (Rundweben etc.), and contains, for example Aramidfasem od. Like. As in the circumferential direction running threads that have a high length consistency and temperature resistance have.
  • a light spring surrounding the valve stem 8 does not serve the purpose Resetting the valve, but ensures the closed position of the valve in Base circle region.
  • the spring serves as a locking spring, in particular: thermally compensate for conditional changes and tolerances.
  • cam element. 2 at least one lateral groove or at least one lateral web before, the or with Tapping elements cooperates on the intermediate member 11 in the connection area are provided to the cam member 2.
  • the intermediate member 11 is a drag lever is, 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, the is mounted in a spherical receptacle 19, so that connected to the valve 7 second end of the intermediate member 11 moves on a circular arc. Since the Valve stem 8 in his leadership in the cylinder head 5 moves straight, would a Ball joint between the head 9 and the intermediate member the valve stem. 8 bend (in the drawing to the left). This is with appropriate choice of material for Although the valve stem 8 executable, but much cheaper is that shown in Fig.
  • connection between the valve stem 8 and the intermediate member 11 is a backlash-free ball joint.
  • a play-free Ball joint shows the embodiment of FIG. 2, wherein in this embodiment the bearing 22 for the intermediate member no defined pivot axis, but a leaf spring 30th od.
  • the spring characteristic of the leaf spring 30 are used twice. For one thing, it can balance the arc slightly bend during the pivoting movement (in Fig. 2 to the right). On the other hand, it can in particular at a slight bias the Press intermediate member 11 against the peripheral surface of the cam member 2, and thereby the closed position of the valve at thermally induced size changes od.
  • the leaf spring 30 thus fulfills the function of a Lash adjuster.
  • Fig. 3 shows an embodiment in which the valve stem 8 with the intermediate member 11 via a second intermediate member forming the handlebar 10 is connected, so that the Joints need no compensation game.
  • the receptacle 12 and the handlebar 10th arranged head 31 also form a play-free ball joint as in this Execution on the valve stem 8 shown receptacle 32 with the second head 31 of the Handlebar 10.
  • the valve stem 8 could of course, as in the other versions with be provided to the head 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, the decommissioning of the valve 7 in spite of rotating Camshaft allows, and therefore to shut off a valve or cylinder can be used.
  • the designed as a drag lever intermediate member 11 is as well as in the embodiment of FIG. 1 in the bearing 22 pivotally and with a provided a game having recording 12, in which the head 9 can wander.
  • the Bearing 22 is adjustable in this embodiment in the cylinder head 5, and is in the Functional position by a latch 24 od.
  • the latch 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 Valve stem 8 connected end of the intermediate member 11 by means of a second latch 29 od.
  • FIGS. 5 and 6 Constructive details of a used as a drag lever intermediate member 11 after the Embodiments of Figs. 1 and 4 show FIGS. 5 and 6.
  • the intermediate member 11 is made composed two mirror-inverted tabs 13, the center of each one Mounting hole 18 for a not shown connecting element (screw, rivets od. Like.) Have.
  • each tab 13 with an eye 17 provided with a second opening the eyelet 17 stands out of the Longitudinal extension of the tabs 13 before, and is on the bearing pin 14, the two chain links 26 connects suspended in the enclosure member 25.
  • Fig. 6 shows a Execution in which the tabs 13 centered like a fork in the middle outward.
  • a Execution in which the eyelets 17 instead of the usually provided there role 27th 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 Recording 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 includes the longitudinal extent of the intermediate member 11 required clearance for the migration of the head 9.
  • Die Receiving 12 is formed by an elongated end rounded recess 15, the is opened down to receive the valve stem 8, and towards the end can be open. 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 Lubricants in particular oil
  • the receptacle 19 is 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.
  • Part of the sprayed Lubricant is caught in the mentioned opening 16 of the receptacle 12 and flows in the recess 15 to the head 9 of the valve stem 8 and further to the guide in the Cylinder head 5. It will therefore easily all moving parts of the Valve gear lubricated.
  • the intermediate member 11 could also consist of a one-piece, substantially flat, Sheet metal stamping be made on which the two tabs 13 on a connecting web are formed, and are folded against each other, at the same time the both 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 junction with the cam member 2 reversed are arranged.
  • Fig. 8 shows in section an embodiment of the in Figs. 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 of two parts 33 on which each 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 Intermediate member 11 is fork-shaped and two mutually parallel webs 35, which engage under the head 9 of the valve stem 8.
  • Another bridge 36 of the Intermediate member 11 extends above the head 9, in this embodiment is cylindrical and is arranged hammerhead on the valve stem 8.
  • the forked End of the intermediate member 11 is pivotable relative to the valve stem 8 and in Slidable longitudinal direction of the intermediate member 11.
  • annular groove in each of which a web 41 engages.
  • the footbridges are on Parts 33 are provided, which complement each other to a conical sleeve, which in one conical bore of the head 9 is held.
  • FIG. 12 shows a variant of the connection region between the intermediate piece 11 and the valve stem 8, in which the free end of the intermediate member 11 a rounded pin 40 which is in an eyelet in the head 9 of the valve stem intervenes.
  • the valve stem 8 is similar to that in Fig. 11 via a two-piece conical Sleeve with webs 41, which engage in an annular groove of the valve stem 8, with the head of the 9th rotatably connected.
  • FIGS. 13 and 14 show an embodiment in which the valve head holder is similar to FIG Fig. 12 is formed, but is provided with an additional shim 48.
  • the intermediate member 11 abuts with a roller 37 on the circumference of the cam member 2, and for the sake of clarity are of that formed by a chain Containment element 25 only two hinge pins 31 shown.
  • the intermediate member 11 has at the opposite end of the pin 40 a hemispherical one Well receiving 19 for the bearing head 23, which in height adjustable bearing 22 is rotatably supported.
  • 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 one with a thread having arranged end portion in the bearing 22 and in turn by a Threaded nut 49 secured. An accessible via a bore 44 screw 47th used for adjustment and clamping in the bearing 22.
  • the eye 46 is of a Bearing pin 45 passes through, in the fork-shaped receptacle 19 of the intermediate member 11 is arranged 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 the cylinder head 5 adjustable bearings 22nd comprises, and as shown in FIG. 17, an adjustable bearing head 23, which in the spherical receptacle 19 of the intermediate member 11 is rotatably mounted.
  • the adjustment of the bearing head 23 by means of a screw 47 which passes through the bore 44th is accessible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP05006467A 2004-03-26 2005-03-24 Actionneur de soupapes desmodromique Expired - Fee Related EP1580405B1 (fr)

Applications Claiming Priority (2)

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

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

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EP05006467A Expired - Fee Related EP1580405B1 (fr) 2004-03-26 2005-03-24 Actionneur de soupapes desmodromique

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

Cited By (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

Citations (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
US4576128A (en) * 1983-12-17 1986-03-18 Honda Giken Kogyo Kabushiki Kaisha Valve operation stopping means for multi-cylinder engine
EP0250797A2 (fr) * 1986-06-05 1988-01-07 DUCATI MECCANICA S.p.A. Culasse à quatre soupapes à opération desmodromique pour un moteur à combustion interne
WO2001012958A1 (fr) * 1999-08-12 2001-02-22 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
EP1277921A1 (fr) * 2001-07-19 2003-01-22 Ducati Motor Holding S.p.A. Assortiment de culasses avec un dispositif de commande des soupapes desmodromique, pour moteurs à combustion interne
US20030159667A1 (en) * 1997-02-13 2003-08-28 Armstrong Mark Frederick Adjustment mechanism for valves
WO2003083269A1 (fr) * 2002-03-28 2003-10-09 Stefan Battlogg Dispositif pour transformer un mouvement rotatoire en un mouvement de va-et-vient

Patent Citations (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
US4576128A (en) * 1983-12-17 1986-03-18 Honda Giken Kogyo Kabushiki Kaisha Valve operation stopping means for multi-cylinder engine
EP0250797A2 (fr) * 1986-06-05 1988-01-07 DUCATI MECCANICA S.p.A. Culasse à quatre soupapes à opération desmodromique pour un moteur à combustion interne
US20030159667A1 (en) * 1997-02-13 2003-08-28 Armstrong Mark Frederick Adjustment mechanism for valves
WO2001012958A1 (fr) * 1999-08-12 2001-02-22 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
EP1277921A1 (fr) * 2001-07-19 2003-01-22 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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 223 (M - 411) 10 September 1985 (1985-09-10) *

Cited By (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

Also Published As

Publication number Publication date
DE502005002015D1 (de) 2008-01-03
EP1580405B1 (fr) 2007-11-21

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