EP2860362B1 - Commande de soupape desmodromique - Google Patents

Commande de soupape desmodromique Download PDF

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Publication number
EP2860362B1
EP2860362B1 EP13188247.4A EP13188247A EP2860362B1 EP 2860362 B1 EP2860362 B1 EP 2860362B1 EP 13188247 A EP13188247 A EP 13188247A EP 2860362 B1 EP2860362 B1 EP 2860362B1
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EP
European Patent Office
Prior art keywords
valve
roller
spring
valve control
desmodromic
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.)
Active
Application number
EP13188247.4A
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German (de)
English (en)
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EP2860362A1 (fr
Inventor
Harald KÖNIG
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Individual
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Individual
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Priority to EP13188247.4A priority Critical patent/EP2860362B1/fr
Priority to JP2014206252A priority patent/JP2015075114A/ja
Publication of EP2860362A1 publication Critical patent/EP2860362A1/fr
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Publication of EP2860362B1 publication Critical patent/EP2860362B1/fr
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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

Definitions

  • the invention relates to a desmodromic valve control, in particular for internal combustion engines, according to the preamble of claim 1.
  • valve controls are understood in which the movement of the valve, actually the valve plate, not against the force of a closing spring, but is positively controlled both when opening and closing. Generally speaking, the movement caused by a force fit is replaced by a movement caused by a positive fit.
  • valve controls have long been proposed, because in particular for fast-rotating internal combustion engines, the problem is that the valve springs are not strong enough to hold the driver on the valve stem in contact with the cam, and it comes to flutter and hitting, causing the wear becomes so extreme that it soon comes to the failure of the valve train.
  • valve movement takes place in a form-controlled manner in the case of desmodromic valve drives, it is necessary to compensate for tolerances, different thermal expansions and also to compensate for wear, to provide elastic compensation for the deviations from the theoretical ideal.
  • valvetrain is known, which is intended for overhead valves and interestingly kinetically practically corresponds exactly to the first mentioned document for standing valves.
  • the actual valve stem is biased against the driver via a spring, so that a hard seating on the valve seat is avoided.
  • FIG.1 a schematic section through the valve axis and normal to the axes of the camshafts, in the closed state of the valve
  • the Fig. 2 a section analogous to that of Fig.1 in the open state of the valve
  • the Fig. 3 a horizontal section along the line III-III of Fig. 1 and the Figs. 4 and 5 Views of a variant according to the Fig. 1 and 2 ,
  • the Fig. 1 shows a section through the axis of the valve stem 7 and normal to the axes of the two camshafts 1, 10.
  • the device has the following structure: A roller carriage 16 is mounted linearly movable in the region of one of its ends in a guide 12, wherein the direction of movement parallel to Axle of the valve stem 7 extends.
  • the roller carriage 16 carries a roller 8 whose axis is parallel to the axes of the two camshafts 1, 10.
  • At the end of the roller carriage 16, which faces away from the guide 12, it has the shape of a double claw, that is, a groove in the vertical direction allows the receptacle of the valve stem 7, and a groove in the horizontal direction, the recording of the spring plate fifth , which is fixedly connected to the valve stem 7.
  • guide springs 3, 4, 6 are provided on the roller carriage, which may for example have the form of leaf springs.
  • the spring plate 5 of the valve stem 7 comes only with these spring elements 3, 4, 6 in contact, these are biased accordingly.
  • the guide of the roller carriage 16 is effected by a rod-shaped runner 15 in the guide 12.
  • the guide 12 is biased relative to the stationary system (engine block, or cylinder 9) by spring elements 13, 14, that the roller 8 to the left, between the cams 2, 11 of the camshafts 1, 10 is pulled so that it always rests against both cams.
  • the roller 8 moves between the cams 2, 11, wherein, as already mentioned, according to the different momentarily effective radii of the cams, rolling friction and sliding friction occurs.
  • lifting or clamping is reliably avoided even with larger deviations from the theoretical ideal position or ideal dimension, since the roller carriage 16 in addition to the significant vertical movement corresponding to the valve lift also a small, but sufficient for tolerance compensation movement in can perform horizontal direction and is pressed only by the spring elements 13, 14 against the cam.
  • valve tappet 7 The actual and accurate guidance of the valve tappet 7 along the valve axis 18 is effected by a, provided with no reference numeral, valve guide.
  • valve guide As a result of the connection between the valve tappet and the roller slide via the springs 3, 4, 6, the valve tappet and thus also the valve disk are set in a stochastic rotary movement about the axis of the valve tappet 7, which leads to a uniform wear or to a dense grinding of the valve seat.
  • the Fig. 3 shows that the roller carriage 16 in the illustrated embodiment can also pivot within limits about the axis of the guide 12, which helps to compensate for tolerances and operational dimensional changes.
  • the Figs. 4 and 5 show in representations corresponding to those of Figs. 1 and 2 a variant with a pivotable roller carriage 16.
  • the guide 12 consists of a rotation axis about which the roller carriage 16 can be rotated.
  • the camshaft, the spring element 14, by which the roller 8 is pressed against the cams 2, 11, and the mechanism as a whole works completely analogous to that of Figs. 1 to 3 ,
  • the transmission of the movement is somewhat different in the illustrated embodiment:
  • a pivotable about its axis valve shaft 19 presses with a flattening against the end face of the valve stem 7, a spring element 6 causes the compensation of all Abnitzept, expansions and tolerances.
  • the valve shaft has a spherical bearing and the valve stem a dome-shaped, concave end face, which facilitates the rotation of the valve stem about the longitudinal axis, but also brings with it a guide.
  • the invention is not limited to the illustrated and described embodiments, but can be modified variously.
  • it is possible to maintain the formation of the claw in the formation of the roller carriage 16 as a pivot lever, and to adapt their shape of the spring plate 5 towards directed surfaces in the roller carriage 16 to the tilting movement.
  • a force component is provided by resilient arrangement, either the bearing of the rocker arm or the rocker arm to the bearing, which aims to bring the three axes of the camshaft and the roller for alignment, so that a secure, permanent concern of the roller 8 on both cams 2, 11 is ensured.
  • roller carriage 16 is to be loaded with a spring so that the roller is pushed away from the bearing 12 but also again to the connecting straight line of the two camshafts.
  • a special training opportunity is instead of a roller 10 two to arrange on the same axis and with the same diameter, one for each cam. Thus, the sliding friction between the cam and roller can be completely avoided. If a torque compensation is desired, then three rollers should be provided symmetrical to the paper plane, the two outer for one of the (then also doubled) cam, the inner for the other cam.
  • valve control is achieved, which manages with extremely vinous components and still uses components that exist in the required steadfastness, dimensioning and mechanical design in the prior art and are therefore available at low cost and in multiple variance.
  • Reference numeral directory 1 camshaft 7 Valve tappet, valve stem 2 cam 8th role 3 guide spring 9 cylinder 4 guide spring 10 camshaft 5 spring plate 11 cam 6 guide spring 12 Leadership, camp 13 spring element 17 activity 14 spring element 18 valve axis 15 bar-shaped runner 16 roll carriage

Landscapes

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

Claims (4)

  1. Commande de soupape desmodromique, en particulier pour des moteurs à combustion interne, caractérisée en ce qu' il est prévu, par soupape, deux arbres à cames (1, 10) dont les cames (2, 11) agissent sur au moins un galet (8) d'un chariot à galets (16), en ce que les axes des arbres à cames et du (des) galet (s) s'étendent parallèlement l'un à l'autre, et en ce que l'axe du galet (8) est poussé par un élément élastique (13, 14) vers le plan de liaison des axes des arbres à cames (1, 10).
  2. Commande de soupape desmodromique selon la revendication 1, caractérisée en ce que les chariots à galets (16) sont guidés dans un moyen de guidage linéaire (12) parallèlement au déplacement de la soupape, et en ce qu'au moins l'élément élastique (13, 14) est prévu dans le moyen de guidage.
  3. Commande de soupape desmodromique selon la revendication 1 ou 2, caractérisée en ce qu'entre le chariot à galets (16) et une cuvette de ressort (5) de la queue de soupape est prévu au moins un ressort (3, 4, 6).
  4. Commande de soupape desmodromique selon la revendication 3, caractérisée en ce que la queue de soupape est en liaison active avec le chariot à galets (16) uniquement par l'intermédiaire des ressorts (3, 4, 6).
EP13188247.4A 2013-10-11 2013-10-11 Commande de soupape desmodromique Active EP2860362B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13188247.4A EP2860362B1 (fr) 2013-10-11 2013-10-11 Commande de soupape desmodromique
JP2014206252A JP2015075114A (ja) 2013-10-11 2014-10-07 デスモドロミック型弁制御装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13188247.4A EP2860362B1 (fr) 2013-10-11 2013-10-11 Commande de soupape desmodromique

Publications (2)

Publication Number Publication Date
EP2860362A1 EP2860362A1 (fr) 2015-04-15
EP2860362B1 true EP2860362B1 (fr) 2016-09-14

Family

ID=49354502

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13188247.4A Active EP2860362B1 (fr) 2013-10-11 2013-10-11 Commande de soupape desmodromique

Country Status (2)

Country Link
EP (1) EP2860362B1 (fr)
JP (1) JP2015075114A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2568107B (en) * 2017-11-07 2022-11-02 Camcon Auto Ltd Actuation assembly and methods of operation thereof

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1238263A (en) * 1916-11-08 1917-08-28 Louis Chevrolet Valve mechanism.
US1238175A (en) 1917-04-09 1917-08-28 Hulbert S Clark Elastic puppet-valve.
DE363020C (de) 1919-12-03 1922-11-03 Fiat Spa Zwanglaeufige Ventilsteuerung fuer Explosionsmotoren
FR771075A (fr) * 1933-06-24 1934-09-29 Procedes Dabeg Soc D Expl Des Dispositif de commande pour distribution à soupapes de moteurs à vapeur ou autres
US3610218A (en) 1970-04-13 1971-10-05 Roger Owen Durham Desmodromic valve actuator
DE3373322D1 (en) 1982-11-24 1987-10-08 Bbc Brown Boveri & Cie Saturated steam turbine plant
DE9004504U1 (fr) * 1990-04-20 1990-06-28 Boehmert, Erich, 4600 Dortmund, De
DE4215056A1 (de) 1992-05-07 1993-11-11 Audi Ag Vorrichtung zum desmodromischen Steuern der Gaswechselventile einer Brennkraftmasschine
WO2002081871A1 (fr) 2001-04-09 2002-10-17 Stefan Battlogg Distribution desmodromique

Also Published As

Publication number Publication date
EP2860362A1 (fr) 2015-04-15
JP2015075114A (ja) 2015-04-20

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