EP0454518A1 - Control device for two adjacent valves - Google Patents

Control device for two adjacent valves Download PDF

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Publication number
EP0454518A1
EP0454518A1 EP91400883A EP91400883A EP0454518A1 EP 0454518 A1 EP0454518 A1 EP 0454518A1 EP 91400883 A EP91400883 A EP 91400883A EP 91400883 A EP91400883 A EP 91400883A EP 0454518 A1 EP0454518 A1 EP 0454518A1
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EP
European Patent Office
Prior art keywords
pusher
recess
pushers
skirt
face
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Withdrawn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
EP91400883A
Other languages
German (de)
French (fr)
Inventor
Gabriel Laine
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.)
Automobiles Peugeot SA
Automobiles Citroen SA
Original Assignee
Automobiles Peugeot SA
Automobiles Citroen SA
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 Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0454518A1 publication Critical patent/EP0454518A1/en
Withdrawn legal-status Critical Current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
    • F01L1/32—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for rotating lift valves, e.g. to diminish wear
    • 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
    • F01L1/14—Tappets; Push rods
    • F01L1/143—Tappets; Push rods for use with overhead 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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/245—Hydraulic tappets
    • F01L1/25—Hydraulic tappets between cam and valve stem
    • 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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis

Definitions

  • the present invention relates to a device for actuating at least two adjacent valves which are slidably mounted in a cylinder head along two parallel axes and each comprising a valve stem whose end is biased axially, against the force applied to it by a return spring, by a control cam which cooperates with the end face of a valve lifter with sliding skirt in a bore of the cylinder head, the two control cams being carried by a shaft cams whose axis is perpendicular to those of the valves.
  • valve lifters currently used are free to rotate each around its respective axis.
  • the diameter of the cylindrical guide portion of each pusher in its bore must be as large as possible to allow significant valve liftings to be obtained, but it is limited by the distance between the axes of the two valves and by the thickness. of the cylinder head material which separates the two bores between them.
  • the object of the present invention is to make it possible to produce pushers which are as light as possible in order to allow rapid opening of the valves and whose guide diameter is as large as possible. to get large valve lift.
  • the invention provides an actuation device of the type mentioned above, characterized in that it comprises means for stopping the rotation of each pusher about its axis and in that the end face of each pusher is a rectangular contour face whose width is parallel to the axis of the camshaft and less than the diameter of the skirt of the pusher to which it is connected by lateral parts inclined relative to the axis of the pusher.
  • a cylinder head portion 10 of an internal combustion engine in which are formed two guide bores 12 of axes XX which each slide to receive a pusher 14 which is provided to cooperate with the upper end 16 of the rod 18 of a valve.
  • the axes XX common to the pusher 14 and to the valve stems 18 are mutually parallel and contained in a plane perpendicular to the upper face 11 of the portion of cylinder head 10 beyond which the pushers 14 project.
  • Each pusher 14 is made of folded and stamped sheet metal and comprises a cylindrical skirt 20 for guiding the pusher in its bore 12 and an upper end face 22 which is designed to cooperate with a control cam 24.
  • the two cams 24 are carried by a common camshaft 26 whose axis of rotation Y-Y is perpendicular to the axes X-X and is contained in the plane common to these two axes.
  • the cams 24 control the movements of the valve stems 18 by means of the pushers 14 against the return force applied to each of the valves by a return spring 27.
  • the bores 12 for guiding the cylindrical skirts 20 of the pushers 14 are connected together in the central part 28 formed between the two pushers by a recess which is formed by a groove or groove 30 in the cylinder head portion 10.
  • the groove 30 is a groove with sides parallel to the axes X-X and Y-Y which intersects the bores 12 and which extends on either side, to the left and the right by considering FIGS. 1 to 4, of the bores 12.
  • each pusher 14 has a tab 32 folded at 90 ° which projects radially outwards relative to the external cylindrical surface 34 of the skirt 20.
  • the skirt 20 has a vertical groove 38 cut out from the sheet.
  • the rectangular contour of the vertical groove 38 is dimensioned so as to receive in sliding, as shown in Figures 1, 3 and 4, the radial tab 32 of the adjacent pusher.
  • the cooperation of the lug 32 with the axial groove 38 ensures the immobilization in rotation of each of the two pushers 14 around its sliding axis X-X.
  • at least one of the pushers is stopped in rotation by cooperation of a relief of the skirt, such as a tab 32, with the sides of the groove 30.
  • the lug 32 and the groove 38 are received in the central part of the recess 28 between the two bores 12 while the radial lug 32 of the left pusher 14, considering Figures 1, 3 and 4, is received in the part right end of the recess 28, this radial tab of course ensuring no immobilization function in rotation.
  • Each of the pushers 14 being immobilized in rotation about its axis, its upper end face 22 with which the corresponding cam 24 cooperates may be a face with a rectangular contour, the surface of which corresponds to the zone of contact with the cam.
  • each upper face 22 has an added contact plate 40.
  • Each intermediate plate 40 has a substantially rectangular outline whose width "l” is substantially equal to the width of the corresponding cam 24 and whose length "L”, which is perpendicular to the axis YY of the camshaft 26, corresponds to the desired valve lift.
  • the pusher thus designed has a lighter structure compared to conventional plungers thanks in particular to the inclined lateral parts 42 which connect the skirt 20 to the upper end face 22.
  • each pusher 14 is a hydraulic pusher whose hydraulic compensation chamber 44 is supplied with oil under pressure by a conduit 48 formed in the cylinder head portion 10, which opens into the guide bore 12 of the pusher 14 opposite an orifice 50 formed in the skirt 20 of the pusher 14 and which is connected to the lubrication circuit of the engine.
  • the lubrication of the guide of the skirt 20 in its bore 12 is ensured by an oil bath 46 which communicates with the bore by a channel 52 and on the opposite face by the leakage rate the pressurized oil arriving through the conduit 48.
  • the inclined profiles of the parts 42 or 42 ′ of the tappets 14 also make it possible to reduce the volume filled with oil from the chamber 44 and therefore the weight of the tappet in the case of a hydraulic tappet.

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

Abstract

The invention relates to a device for actuating at least two adjacent valves which are mounted sliding in a cylinder head (10) along two parallel axes (X-X) and each comprising a valve stem (18) whose end (16) is actuated axially, against the coaxial force applied to it by a return spring (27), by a driving cam (24) which cooperates with the end face (22, 40) of a valve push rod (14) with a skirt (20) sliding in a bore in the cylinder head (10), the two driving cams (24) being carried by a cam shaft (26) whose axis (Y-Y) is perpendicular to those (X-X) of the valves, characterised in that it comprises means (32, 38) of stopping the rotation of each push rod (14) about its axis (X-X) and in that the end face of each push rod is a face having a rectangular outline whose width (l) is parallel to the axis (Y-Y) of the cam shaft and less than the diameter of the skirt (20) of the push rod, to which it is connected by lateral parts (42) which are inclined with respect to the axis (X-X) of the push rod. <IMAGE>

Description

La présente invention concerne un dispositif d'actionnement d'au moins deux soupapes voisines qui sont montées coulissantes dans une culasse selon deux axes parallèles et comportant chacune une tige de soupape dont l'extrémité est sollicitée axialement, à l'encontre de l'effort qui lui est appliqué par un ressort de rappel, par une came de commande qui coopère avec la face d'extrémité d'un poussoir de soupape à jupe coulissant dans un alésage de la culasse, les deux cames de commande étant portées par un arbre à cames dont l'axe est perpendiculaire à ceux des soupapes.The present invention relates to a device for actuating at least two adjacent valves which are slidably mounted in a cylinder head along two parallel axes and each comprising a valve stem whose end is biased axially, against the force applied to it by a return spring, by a control cam which cooperates with the end face of a valve lifter with sliding skirt in a bore of the cylinder head, the two control cams being carried by a shaft cams whose axis is perpendicular to those of the valves.

Les poussoirs de soupapes actuellement utilisés, qu'ils soient mécaniques ou hydrauliques, sont libres en rotation chacun autour de son axe respectif.The valve lifters currently used, whether mechanical or hydraulic, are free to rotate each around its respective axis.

Le diamètre de la portion cylindrique de guidage de chaque poussoir dans son alésage doit être le plus grand possible pour permettre d'obtenir des levées de soupape importantes mais il est limité par la cote d'écartement des axes des deux soupapes et par l'épaisseur du matériau de la culasse qui sépare les deux alésages entre eux.The diameter of the cylindrical guide portion of each pusher in its bore must be as large as possible to allow significant valve liftings to be obtained, but it is limited by the distance between the axes of the two valves and by the thickness. of the cylinder head material which separates the two bores between them.

La zone de contact théorique entre la came et la face d'extrémité du poussoir est retangulaire mais, du fait de la rotation du poussoir, c'est toute la surface supérieure en forme de disque du plateau qui est utilisée pendant le fonctionnement et qui doit posséder des caractéristiques de résistance et de friction correspondantes.The theoretical contact area between the cam and the end face of the pusher is retangular but, due to the rotation of the pusher, the entire upper disc-shaped surface of the plate which is used during operation and which must have corresponding resistance and friction characteristics.

Il existe donc deux portions de surfaces chacune en forme de demi-lune qui sont théoriquement inutiles et qui augmentent le poids total du poussoir.There are therefore two portions of surfaces each in the form of a half-moon which are theoretically useless and which increase the total weight of the pusher.

La présente invention a pour but de permettre de réaliser des poussoirs qui soient le plus léger possible afin de permettre une ouverture rapide des soupapes et dont le diamètre de guidage soit le plus grand possible pour obtenir des levées de soupapes importantes.The object of the present invention is to make it possible to produce pushers which are as light as possible in order to allow rapid opening of the valves and whose guide diameter is as large as possible. to get large valve lift.

Dans ce but l'invention propose un dispositif d'actionnemnt du type mentionné plus haut, caractérisé en ce qu'il comporte des moyens d'arrêt en rotation de chaque poussoir autour de son axe et en ce que la face d'extrémité de chaque poussoir est une face de contour rectangulaire dont la largeur est parallèle à l'axe de l'arbre à cames et inférieure au diamètre de la jupe du poussoir à laquelle elle est reliée par des parties latérales inclinées par rapport à l'axe du poussoir.To this end, the invention provides an actuation device of the type mentioned above, characterized in that it comprises means for stopping the rotation of each pusher about its axis and in that the end face of each pusher is a rectangular contour face whose width is parallel to the axis of the camshaft and less than the diameter of the skirt of the pusher to which it is connected by lateral parts inclined relative to the axis of the pusher.

Selon d'autres caractéristiques de l'invention :

  • les moyens d'arrêt en rotation des poussoirs sont situés dans un évidement qui relie entre eux les alésages des poussoirs et les moyens d'arrêt en rotation comportent des formes complémentaires formées respectivement sur chacun des poussoirs, situées dans l'évidement et qui coopèrent entre elles ;
  • la portion cylindrique de guidage de chaque poussoir est une jupe cylindrique montée coulissante dans l'alésage, un premier poussoir comportant un relief qui fait saillie radialement depuis la surface cylindrique externe de la jupe du poussoir, qui s'étend dans l'évidement et qui est reçu en coulissement dans une rainure axiale formée dans la jupe du poussoir voisin ;
  • la jupe de chacun des poussoirs est réalisée en tôle et le relief est une patte radial repliée à 90° venu de matière avec la jupe ;
  • la rainure axiale est découpée dans la jupe du poussoir ;
  • les jupes des deux poussoirs voisins sont identiques, la patte et la rainure de chaque poussoir étant opposées diamétralement, et l'évidement qui relie les deux alésages s'étend de part et d'autre de ces derniers en éloignement de la portion centrale de l'évidement dans laquelle sont reçues la patte et la rainure coopérantes ;
  • l'évidement est une gorge à flancs parallèles qui s'ouvre dans la face supérieure de la culasse à travers laquelle font saillie les faces d'extrémité des poussoirs ; et
  • chacun des poussoirs est un poussoir hydraulique dont la chambre hydraulique de compensation est alimentée en huile par un conduit de la culasse qui débouche dans l'aIésage de guidage du poussoir et à travers un orifice formé dans la portion cylindrique de guidage du poussoir et agencé sensiblement en regard du conduit.
According to other characteristics of the invention:
  • the means for stopping the tappets in rotation are located in a recess which connects the bores of the tappets together and the means for stopping in rotation comprise complementary shapes formed respectively on each of the tappets, located in the recess and which cooperate between them;
  • the cylindrical guide portion of each pusher is a cylindrical skirt mounted sliding in the bore, a first pusher having a relief which projects radially from the external cylindrical surface of the pusher skirt, which extends in the recess and which is slidably received in an axial groove formed in the skirt of the neighboring pusher;
  • the skirt of each of the pushers is made of sheet metal and the relief is a radial tab folded at 90 ° integral with the skirt;
  • the axial groove is cut in the skirt of the pusher;
  • the skirts of the two neighboring pushers are identical, the tab and the groove of each pushbutton being diametrically opposite, and the recess which connects the two bores extends on either side of the latter away from the central portion of the in which the tab and the cooperating groove;
  • the recess is a groove with parallel sides which opens in the upper face of the cylinder head through which the end faces of the pushers project; and
  • each of the tappets is a hydraulic tappet, the hydraulic compensation chamber of which is supplied with oil by a cylinder head duct which opens into the tappet guide bore and through an orifice formed in the cylindrical guide portion of the tappet and arranged substantially next to the conduit.

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui va suivre pour la compréhension de laquelle on se reportera au dessin annexé dans lequel :

  • La figure 1 est une vue en coupe partielle selon la ligne 1-1 de la figure 2 d'un mode de réalisation d'un dispositif d'actionnement selon l'invention ;
  • la figure 2 est une vue en coupe selon la ligne 2-2 de la figure 1 ;
  • la figure 3 est une vue en coupe selon la ligne 3-3 de la figure 1 ; et
  • la figure 4 est une vue schématique de dessus des deux poussoirs d'actionnement du dispositif représenté aux figures 1 à 3.
Other characteristics and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawing in which:
  • Figure 1 is a partial sectional view along line 1-1 of Figure 2 of an embodiment of an actuating device according to the invention;
  • Figure 2 is a sectional view along line 2-2 of Figure 1;
  • Figure 3 is a sectional view along line 3-3 of Figure 1; and
  • FIG. 4 is a schematic top view of the two actuating pushers of the device shown in FIGS. 1 to 3.

On a représenté aux figures une portion de culasse 10 d'un moteur à combustion interne dans laquelle sont formés deux alésages de guidage 12 d'axes X-X qui reçoivent chacun en coulissement un poussoir 14 qui est prévu pour coopérer avec l'extrémité supérieure 16 de la tige 18 d'une soupape.There is shown in the figures a cylinder head portion 10 of an internal combustion engine in which are formed two guide bores 12 of axes XX which each slide to receive a pusher 14 which is provided to cooperate with the upper end 16 of the rod 18 of a valve.

Les axes X-X communs au poussoir 14 et aux tiges de soupape 18 sont parallèles entre eux et contenus dans un plan perpendiculaire à la face supérieure 11 de la portion de culasse 10 au-delà de laquelle font saillie les poussoirs 14.The axes XX common to the pusher 14 and to the valve stems 18 are mutually parallel and contained in a plane perpendicular to the upper face 11 of the portion of cylinder head 10 beyond which the pushers 14 project.

Chaque poussoir 14 est réalisé en tôle pliée et emboutie et comporte une jupe cylindrique 20 de guidage du poussoir dans son alésage 12 et une face supérieure d'extrémité 22 qui est prévue pour coopérer avec une came de commande 24.Each pusher 14 is made of folded and stamped sheet metal and comprises a cylindrical skirt 20 for guiding the pusher in its bore 12 and an upper end face 22 which is designed to cooperate with a control cam 24.

Les deux cames 24 sont portées par un arbre à cames commun 26 dont l'axe de rotation Y-Y est perpendiculaire aux axes X-X et est contenu dans le plan commun à ces deux axes.The two cams 24 are carried by a common camshaft 26 whose axis of rotation Y-Y is perpendicular to the axes X-X and is contained in the plane common to these two axes.

Les cames 24 commandent les mouvements des tiges de soupapes 18 par l'intermédiaire des poussoirs 14 à l'encontre de l'effort de rappel appliqué à chacune des soupapes par un ressort de rappel 27.The cams 24 control the movements of the valve stems 18 by means of the pushers 14 against the return force applied to each of the valves by a return spring 27.

Les alésages 12 de guidage des jupes cylindriques 20 des poussoirs 14 sont reliés entre eux dans la partie centrale 28 formée entre les deux poussoirs par un évidement qui est constitué par une gorge ou saignée 30 de la portion de culasse 10.The bores 12 for guiding the cylindrical skirts 20 of the pushers 14 are connected together in the central part 28 formed between the two pushers by a recess which is formed by a groove or groove 30 in the cylinder head portion 10.

La gorge 30 est une gorge à flancs parallèles aux axes X-X et Y-Y qui intercèpte les alésages 12 et qui s'étend de part et d'autre, vers la gauche et la droite en considérant les figures 1 à 4, des alésages 12.The groove 30 is a groove with sides parallel to the axes X-X and Y-Y which intersects the bores 12 and which extends on either side, to the left and the right by considering FIGS. 1 to 4, of the bores 12.

A sa partie inférieure qui est reçue dans l'alésage 12 et dans l'évidement 28, la jupe 20 de chaque poussoir 14 comporte une patte 32 repliée à 90° qui fait saillie radialement vers l'extérieur par rapport à la surface cylindrique externe 34 de la jupe 20.At its lower part which is received in the bore 12 and in the recess 28, the skirt 20 of each pusher 14 has a tab 32 folded at 90 ° which projects radially outwards relative to the external cylindrical surface 34 of the skirt 20.

A la même hauteur par rapport à son bord circulaire inférieur 36, la jupe 20 comporte une rainure verticale 38 découpée dans la tôle.At the same height with respect to its lower circular edge 36, the skirt 20 has a vertical groove 38 cut out from the sheet.

Le contour rectangulaire de la rainure verticale 38 est dimensionné de manière à recevoir en coulissement, comme cela est représenté aux figures 1, 3 et 4, la patte radiale 32 du poussoir adjacent.The rectangular contour of the vertical groove 38 is dimensioned so as to receive in sliding, as shown in Figures 1, 3 and 4, the radial tab 32 of the adjacent pusher.

La coopération de la patte 32 avec la rainure axiale 38 assure l'immobilisation en rotation de chacun des deux poussoirs 14 autour de son axe de coulissement X-X. En variante, au moins l'un des poussoirs est arrêté en rotation par coopération d'un relief de la jupe, tel qu'une patte 32, avec les flancs de la gorge 30.The cooperation of the lug 32 with the axial groove 38 ensures the immobilization in rotation of each of the two pushers 14 around its sliding axis X-X. As a variant, at least one of the pushers is stopped in rotation by cooperation of a relief of the skirt, such as a tab 32, with the sides of the groove 30.

La patte 32 et la rainure 38 sont reçues dans la partie centrale de l'évidement 28 entre les deux alésages 12 tandis que la patte radiale 32 du poussoir de gauche 14, en considérant les figures 1, 3 et 4, est reçue dans la partie d'extrémité de droite de l'évidement 28, cette patte radiale n'assurant bien entendu aucune fonction d'immobilisation en rotation.The lug 32 and the groove 38 are received in the central part of the recess 28 between the two bores 12 while the radial lug 32 of the left pusher 14, considering Figures 1, 3 and 4, is received in the part right end of the recess 28, this radial tab of course ensuring no immobilization function in rotation.

Chacun des poussoirs 14 étant immobilisé en rotation autour de son axe, sa face d'extrémité supérieure 22 avec laquelle coopère la came correspondante 24 peut être un face de contour rectangulaire dont la surface correspond à la zone de contact avec la came.Each of the pushers 14 being immobilized in rotation about its axis, its upper end face 22 with which the corresponding cam 24 cooperates may be a face with a rectangular contour, the surface of which corresponds to the zone of contact with the cam.

Dans le mode de réalisation représenté, chaque face supérieure 22 comporte une plaque de contact rapportée 40.In the embodiment shown, each upper face 22 has an added contact plate 40.

Chaque plaque intermédiaire 40 présente un contour sensiblement rectangulaire dont la largeur "l" est sensiblement égale à la largeur de la came correspondante 24 et dont la longueur "L", qui est perpendiculaire à l'axe Y-Y de l'arbre à cames 26, correspond à la levée de soupape souhaitée.Each intermediate plate 40 has a substantially rectangular outline whose width "l" is substantially equal to the width of the corresponding cam 24 and whose length "L", which is perpendicular to the axis YY of the camshaft 26, corresponds to the desired valve lift.

Le poussoir ainsi conçu présente une structure allégée par rapport aux poussoirs classiques grâce notamment aux parties latérales inclinées 42 qui relient la jupe 20 à la face d'extrémité supérieure 22.The pusher thus designed has a lighter structure compared to conventional plungers thanks in particular to the inclined lateral parts 42 which connect the skirt 20 to the upper end face 22.

Cet allègement peut encore être accentué, et l'inertie en translation du poussoir réduite, en adoptant le profil incurvé 42′ représenté en traits mixtes à la figure 1.This reduction can be further accentuated, and the inertia in translation of the pusher reduced, in adopting the curved profile 42 ′ shown in phantom in Figure 1.

Dans le mode de réalisation représenté aux figures, chaque poussoir 14 est un poussoir hydraulique dont la chambre hydraulique de compensation 44 est alimentée en huile sous pression par un conduit 48 formé dans la portion de culasse 10, qui débouche dans l'alésage 12 de guidage du poussoir 14 en regard d'un orifice 50 formé dans la jupe 20 du poussoir 14 et qui est relié au circuit de lubrification du moteur.In the embodiment shown in the figures, each pusher 14 is a hydraulic pusher whose hydraulic compensation chamber 44 is supplied with oil under pressure by a conduit 48 formed in the cylinder head portion 10, which opens into the guide bore 12 of the pusher 14 opposite an orifice 50 formed in the skirt 20 of the pusher 14 and which is connected to the lubrication circuit of the engine.

Du fait de l'immobilisation en rotation de chacun des poussoirs, il n'est plus nécessaire de prévoir dans la portion de culasse 10 une gorge radiale périphérique qui entoure complètement la jupe 20 du poussoir 14.Due to the immobilization in rotation of each of the pushers, it is no longer necessary to provide in the cylinder head portion 10 a peripheral radial groove which completely surrounds the skirt 20 of the pushbutton 14.

La lubrification du guidage de la jupe 20 dans son alésage 12 est assurée par un bain d'huile 46 qui communique avec l'alésage par un canal 52 et sur la face opposée par le débit de fuite l'huile sous pression arrivant par le conduit 48.The lubrication of the guide of the skirt 20 in its bore 12 is ensured by an oil bath 46 which communicates with the bore by a channel 52 and on the opposite face by the leakage rate the pressurized oil arriving through the conduit 48.

Un évidement central 28 étant prévu entre les alésages 12, les parois sensiblement tangentes des jupes 20 peuvent être très rapprochées l'une de l'autre ce qui permet d'augmenter le diamètre des alésages de guidage.A central recess 28 being provided between the bores 12, the substantially tangent walls of the skirts 20 can be very close to each other which makes it possible to increase the diameter of the guide bores.

Les profils inclinés des parties 42 ou 42′ des poussoirs 14 permettent également de réduire le volume rempli d'huile de la chambre 44 et donc le poids du poussoir dans le cas d'un poussoir hydraulique.The inclined profiles of the parts 42 or 42 ′ of the tappets 14 also make it possible to reduce the volume filled with oil from the chamber 44 and therefore the weight of the tappet in the case of a hydraulic tappet.

Claims (9)

Dispositif d'actionnement d'au moins deux soupapes voisines qui sont montées coulissantes dans une culasse (10) selon deux axes parallèles (X-X) et comportant chacune une tige de soupape (18) dont l'extrémité (16) est sollicitée axialement, à l'encontre de l'effort coaxial qui lui est appliqué par un ressort de rappel (27), par une came de commande (24) qui coopère avec la face d'extrémité (22, 40) d'un poussoir de soupape (14) à jupe (20) coulissant dans un alésage (12) de la culasse (10), les deux cames de commande (24) étant portées par un arbre à cames (26) dont l'axe (Y-Y) est perpendiculaire à ceux (X-X) des soupapes, caractérisé en ce qu'il comporte des moyens (32, 38) d'arrêt en rotation de chaque poussoir (14) autour de son axe (X-X) et en ce que la face d'extrémité de chaque poussoir est une face de contour rectangulaire dont la largeur (l) est parallèle à l'axe (Y-Y) de l'arbre à cames et inférieure au diamètre de la jupe (20) du poussoir à laquelle elle est reliée par des parties latérales (42) inclinées par rapport à l'axe (X-X) du poussoir.Device for actuating at least two adjacent valves which are slidably mounted in a cylinder head (10) along two parallel axes (XX) and each comprising a valve stem (18) the end (16) of which is axially stressed, at against the coaxial force applied to it by a return spring (27), by a control cam (24) which cooperates with the end face (22, 40) of a valve lifter (14 ) with skirt (20) sliding in a bore (12) of the cylinder head (10), the two control cams (24) being carried by a camshaft (26) whose axis (YY) is perpendicular to those ( XX) of the valves, characterized in that it comprises means (32, 38) for stopping the rotation of each pusher (14) about its axis (XX) and in that the end face of each pusher is a rectangular contour face whose width (l) is parallel to the axis (YY) of the camshaft and less than the diameter of the skirt (20) of the valve lifter e it is connected by lateral parts (42) inclined relative to the axis (X-X) of the pusher. Dispositif selon la revendication 1, caractérisé en ce que les moyens d'arrêt en rotation sont situés dans un évidement (28) de la culasse (10).Device according to claim 1, characterized in that the rotational stop means are located in a recess (28) of the cylinder head (10). Dispositif selon la revendication 2, caractérisé en ce que l'évidement (28) relie entre eux les alésages (12) des poussoirs (14) et en ce que les moyens d'arrêt en rotation (32, 38) comportent des formes complémentaires formées respectivement sur chacun des poussoirs (14), situées dans l'évidement (28) et qui coopèrent entre elles.Device according to claim 2, characterized in that the recess (28) interconnects the bores (12) of the pushers (14) and in that the means for stopping in rotation (32, 38) comprise complementary shapes formed respectively on each of the pushers (14), located in the recess (28) and which cooperate with each other. Dispositif selon la revendication 3, caractérisé en ce que au moins l'un des poussoirs (14) comporte un relief (32) qui fait saillie radialement depuis la surface cylindrique externe (34) de la jupe (20) du poussoir (14), qui s'étend dans l'évidement (28) et qui est reçu en coulissement dans cet évidement ou dans une rainure axiale (38) formée dans la jupe (20) du poussoir voisin.Device according to claim 3, characterized in that at least one of the pushers (14) has a relief (32) which projects radially from the external cylindrical surface (34) of the skirt (20) of the pusher (14), which extends in the recess (28) and which is slidably received in this recess or in an axial groove (38) formed in the skirt (20) of the neighboring pusher. Dispositif selon la revendication 4, caractérisé en ce que les jupes (20) des deux poussoirs voisins sont identiques, le relief (32) et la rainure (38) de chaque poussoir étant opposés diamétralement, et en ce que l'évidement (28) qui relie les deux alésages (12) s'étend de part et d'autre de ces derniers.Device according to claim 4, characterized in that the skirts (20) of the two neighboring pushers are identical, the relief (32) and the groove (38) of each pushbutton being diametrically opposite, and in that the recess (28) which connects the two bores (12) extends on either side of the latter. Dispositif selon la revendication 5, caractérisé en ce que l'évidement est une gorge (30) à flancs parallèles qui s'ouvre dans la face supérieure (11) de la culasse (10) à travers laquelle font saillie les faces d'extrémité des poussoirs (14).Device according to claim 5, characterized in that the recess is a groove (30) with parallel sides which opens in the upper face (11) of the cylinder head (10) through which the end faces of the pushers (14). Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que chacun des poussoirs est réalisé en tôle emboutie.Device according to any one of the preceding claims, characterized in that each of the pushers is made of pressed sheet metal. Dispositif selon la revendication 7, caractérisé en ce que la face d'extrémité (22) de chaque poussoir supporte une plaque rectangulaire (40).Device according to claim 7, characterized in that the end face (22) of each pusher supports a rectangular plate (40). Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que chacun des poussoirs (14) est un poussoir hydraulique dont la chambre hydraulique de compensation (44) est alimentée en huile par un conduit (48) de la culasse qui débouche dans l'alésage de guidage (12) du poussoir (14) et à travers un orifice (50) formé dans la portion cylindrique de guidage du poussoir et agencé sensiblement en regard du conduit (48).Device according to any one of the preceding claims, characterized in that each of the tappets (14) is a hydraulic tappet, the hydraulic compensation chamber (44) of which is supplied with oil by a conduit (48) from the cylinder head which opens into the 'guide bore (12) of the pusher (14) and through an orifice (50) formed in the cylindrical guide portion of the pusher and arranged substantially opposite the conduit (48).
EP91400883A 1990-04-24 1991-03-29 Control device for two adjacent valves Withdrawn EP0454518A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9005221A FR2661211B1 (en) 1990-04-24 1990-04-24 DEVICE FOR ACTUATING TWO NEIGHBORING VALVES.
FR9005221 1990-04-24

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EP0454518A1 true EP0454518A1 (en) 1991-10-30

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EP91400883A Withdrawn EP0454518A1 (en) 1990-04-24 1991-03-29 Control device for two adjacent valves

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EP (1) EP0454518A1 (en)
FR (1) FR2661211B1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997028355A1 (en) * 1996-02-03 1997-08-07 INA Wälzlager Schaeffler oHG Pushrod for the valve gear mechanism of an internal combustion engine
EP1059423A3 (en) * 1999-06-07 2001-03-14 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve driving apparatus for internal combustion engine
DE19957772A1 (en) * 1999-12-01 2001-06-07 Bayerische Motoren Werke Ag Valve lifter for valve drive in IC engines esp. cup lifter has check part with contact path fastened to guide jacket via acute angle chamfers
DE10123966A1 (en) * 2001-05-17 2002-11-21 Ina Schaeffler Kg Bucket tappet for valve drive has jacket with appreciably lower height than bucket tappet as whole
DE10332981A1 (en) * 2003-07-21 2005-02-10 Bayerische Motoren Werke Ag Valve tappet unit for internal combustion engine has first and second engagement protrusions each entering allocated radial hole in sleeve section and in direction radial to axis of oscillation

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267919A (en) * 1965-06-21 1966-08-23 Gen Motors Corp Tappet anti-rotating device
DE3725458A1 (en) * 1987-07-31 1989-02-09 Bayerische Motoren Werke Ag Control device for inlet/exhaust valves of an internal combustion engine
DE3806839A1 (en) * 1988-03-03 1989-09-14 Bayerische Motoren Werke Ag Positionally secured valve tappet, especially for internal combustion engines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267919A (en) * 1965-06-21 1966-08-23 Gen Motors Corp Tappet anti-rotating device
DE3725458A1 (en) * 1987-07-31 1989-02-09 Bayerische Motoren Werke Ag Control device for inlet/exhaust valves of an internal combustion engine
DE3806839A1 (en) * 1988-03-03 1989-09-14 Bayerische Motoren Werke Ag Positionally secured valve tappet, especially for internal combustion engines

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997028355A1 (en) * 1996-02-03 1997-08-07 INA Wälzlager Schaeffler oHG Pushrod for the valve gear mechanism of an internal combustion engine
US6032631A (en) * 1996-02-03 2000-03-07 Ina Walzlager Schaeffler Ohg Tappet for a valve train of an internal combustion engine
US6119643A (en) * 1996-02-03 2000-09-19 Ina Wlazlager Schaeffler Ohg Tappet for a valve train of an internal combustion engine
EP1059423A3 (en) * 1999-06-07 2001-03-14 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Valve driving apparatus for internal combustion engine
EP1336725A3 (en) * 1999-06-07 2003-11-12 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Internal combustion engine
DE19957772A1 (en) * 1999-12-01 2001-06-07 Bayerische Motoren Werke Ag Valve lifter for valve drive in IC engines esp. cup lifter has check part with contact path fastened to guide jacket via acute angle chamfers
DE10123966A1 (en) * 2001-05-17 2002-11-21 Ina Schaeffler Kg Bucket tappet for valve drive has jacket with appreciably lower height than bucket tappet as whole
DE10332981A1 (en) * 2003-07-21 2005-02-10 Bayerische Motoren Werke Ag Valve tappet unit for internal combustion engine has first and second engagement protrusions each entering allocated radial hole in sleeve section and in direction radial to axis of oscillation
US7146952B2 (en) 2003-07-21 2006-12-12 Bayerische Motoren Werke Aktiengesellschaft Valve tappet system, especially anti-rotation bucket tappet having curved cam follower surface

Also Published As

Publication number Publication date
FR2661211A1 (en) 1991-10-25
FR2661211B1 (en) 1992-08-14

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