WO2015150692A1 - Valve with easy assembly of a coupling in a cam - Google Patents

Valve with easy assembly of a coupling in a cam Download PDF

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Publication number
WO2015150692A1
WO2015150692A1 PCT/FR2015/050832 FR2015050832W WO2015150692A1 WO 2015150692 A1 WO2015150692 A1 WO 2015150692A1 FR 2015050832 W FR2015050832 W FR 2015050832W WO 2015150692 A1 WO2015150692 A1 WO 2015150692A1
Authority
WO
WIPO (PCT)
Prior art keywords
cam
valve
hitch
cam path
path
Prior art date
Application number
PCT/FR2015/050832
Other languages
French (fr)
Inventor
Frédéric Ribera
Sylvain Gautier
Original Assignee
Valeo Systemes De Controle Moteur
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 Valeo Systemes De Controle Moteur filed Critical Valeo Systemes De Controle Moteur
Priority to EP15717049.9A priority Critical patent/EP3132169A1/en
Publication of WO2015150692A1 publication Critical patent/WO2015150692A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/52—Mechanical actuating means with crank, eccentric, or cam
    • F16K31/528—Mechanical actuating means with crank, eccentric, or cam with pin and slot
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • F02M26/54—Rotary actuators, e.g. step motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/55—Systems for actuating EGR valves using vacuum actuators
    • F02M26/58—Constructional details of the actuator; Mounting thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/66—Lift valves, e.g. poppet valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/047—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/52—Mechanical actuating means with crank, eccentric, or cam
    • F16K31/524—Mechanical actuating means with crank, eccentric, or cam with a cam
    • F16K31/52408—Mechanical actuating means with crank, eccentric, or cam with a cam comprising a lift valve

Definitions

  • the invention relates to a valve, in particular a valve intended to be implemented in the automotive field.
  • the invention more particularly relates to an exhaust gas recirculation valve, or EG valve, of the English "Exhaust Gas Recirculation”.
  • the invention also relates to a method of manufacturing such a valve.
  • valves comprising a valve opening control member, for example a toothed sector wheel, which rotates against a return spring acting in torsion.
  • the return spring removes the control member in a specific position, once the actuation of the control member is completed.
  • the return spring also keeps the control member in the determined position in the absence of actuation, despite the vibrations to which the valve can be subjected.
  • Such a valve may in particular be of the valve type moving in translation or in a helical movement, with respect to a valve seat which selectively closes.
  • a device is interposed functionally between the control member and the valve stem, which transforms the rotation of the control member in translation, respectively in helical movement, of the valve stem.
  • EGR valve of this type is known from FR-A-2 914 975 or FR-A-2 947 027, in the name of the Applicant.
  • EGR recirculation valves
  • Figure 1 illustrates an EGR valve according to FR-A-2 947 027.
  • the valve 100 comprises a valve 102 which allows the introduction and metering of the exhaust gas into the intake duct of a combustion engine of a motor vehicle.
  • the valve 100 comprises an electric motor 104 meshing with a transmission wheel 106.
  • the transmission wheel 106 meshes with a control member 108, here a toothed sector wheel.
  • a camming cam 110 By means of a camming cam 110, the rotational movements of the toothed sector wheel 108 are converted into reciprocating movement of the valve 102 relative to a valve seat. More specifically, a hitch 112 is mounted in the cam 110, which is rotated by the toothed sector wheel 108.
  • the hitch 112 comprises a bar 114 with a roller 116 free to rotate at each of its ends, each roller 116 being received in a respective track of the cam path of the cam 110.
  • a valve stem 118 integral in translation with the The bar 114 and the valve 102 then makes it possible to raise the valve 102 of a valve seat to selectively open the valve 100.
  • toothed sector wheel 108 is returned to the closed position of the valve 100 by a return spring 112, acting in torsion.
  • the rollers are assembled on the bar, received in the cam from the outside of the cam. This way of proceeding is however complex.
  • the hitch once assembled, is inserted into the cam, from an axial end of the cam, through two recesses in the side wall of the cam, of passage of the hitch, which open on the one hand at an axial end of the cam and, on the other hand, in the cam path.
  • the insertion of the hitch is then carried out by maintaining it in a position where the axis between the two rollers is contained in a plane normal to the axis of the cam.
  • this way of proceeding remains complex.
  • the presence of recesses in the side wall of the cam greatly reduces its mechanical strength, which is detrimental to the life of the cam.
  • the invention aims to provide a valve EG, and more generally, a valve, including a valve for a motor vehicle, does not have the aforementioned drawbacks.
  • the invention aims to provide a valve whose mounting is facilitated.
  • the invention proposes a valve, in particular a valve for a motor vehicle such as an exhaust gas recirculation valve, comprising:
  • a hinge integral in rotation with the control member and comprising a bar and two rollers free to rotate at the ends of the bar, the rollers being adapted to be guided in a cam cam, and
  • the hitch and the cam being shaped to allow the bias insertion of the hitch in the cam, from an axial opening of the cam, so as to engage one of the rollers only in the cam path, and the rotation the hitch to place the other of the rollers next to the cam path.
  • the mounting of the hitch in the valve is achieved in a few simple and quick steps, once the hitch assembled.
  • Such a valve is therefore easier to manufacture.
  • the valve may have one or more of the following features, taken alone or in combination: -
  • the side wall of the cam is devoid of passage recess of the coupling, opening on the one hand to an axial end of the cam and on the other hand, in the cam path;
  • the cam path comprises two tracks, each track preferably extending over an angular sector of at least 90 °, more preferably at least 100 °;
  • At least one track of the cam path comprises at one end, preferably at the end that is axially closest to the axial end of the cam by which the insert is inserted.
  • the hitch a chamfer facing the outside of the cam;
  • the upper ramp of the one or more tracks of the cam path has, at the end having a chamfer, a variation of substantially continuous slope
  • An end of at least one track of the cam path preferably one end of the two tracks of the cam path, has an opening in the side wall of the cam, of diameter greater than the diameter of a roller;
  • the cam comprises at least one, preferably at least two grooves in the radially inner surface of the cam, the grooves preferably having a narrowing at their outlet on an axial end of the cam;
  • the groove or grooves are angularly between the tracks of the cam path;
  • the hitch In the closed position of the valve, the hitch is not in abutment laterally in the cam path.
  • the invention relates to a method of mounting a valve as described above in all its combinations, comprising the steps of:
  • FIG. 1 shows in perspective, a partially cutaway view of an EGR valve
  • FIGS. 4 and 5 represent, according to different perspectives, a cam of the motion transformation device of FIGS. 2 and 3;
  • FIG. 6 shows schematically in perspective the insertion of a hitch assembled to a valve stem in the cam of Figures 4 and 5;
  • FIG. 7 shows schematically in perspective, the cam of Figures 4 and 5, provided with a hitch and fixed in a cam housing provided for this purpose in a valve body.
  • valve for example an EG valve for a motor vehicle, a portion of which is illustrated in FIGS. 2 and 3.
  • This valve comprises a valve 12 which allows the introduction and dosing of a fluid, here the exhaust gas, in a pipe, here the intake.
  • the valve is of the type comprising a control member 14 rotating (or rotating) against a return spring 16 acting in torsion.
  • the valve first comprises a valve body forming a conduit for the exhaust gas to be recirculated.
  • the valve body may also form a conduit for cooling water circulation of the valve.
  • the body may have valve mounting holes to a power unit of a motor vehicle.
  • Such fixing holes may in particular be made in flanges surrounding the outlets of the cooling water circulation duct, thus making it possible to integrate the cooling water circulation duct of the valve into the water circulation duct. engine cooling on which the valve is attached.
  • Such fixing holes may also be made in flanges surrounding the outlets of an exhaust gas recirculation duct.
  • the valve also includes a motor that can be mounted in a housing formed by the valve body.
  • the engine meshes with a transmission wheel.
  • the transmission wheel in turn engages the control member 14, here a toothed sector wheel.
  • the motor is thus adapted to rotate the toothed sector wheel 14.
  • reciprocating movement here is meant a movement comprising a translation along an axis, possibly combined with a rotation with respect to this same axis.
  • the movement transformation device 18 comprises, inside a support member formed by the valve body, a cam-shaped cam 22 (or cylindrical cam), a hitch 24 cooperating with the path of the cam.
  • cam 22 of the cylindrical cam 20 the hitch 24 comprising a bar 25 fixed to the end of a rod 26 integral with the valve 12.
  • the rod 26 in the valve body it can be provided one or more bearings between the rod 26 and the valve body. It can be provided a clearance between the rod 26 and the bar 25 to allow a rotation of the rod relative to the bar, around the axis of the rod, the bar and the rod being integral in translation in the direction of the axis of the rod.
  • the cam path 22 is here formed of two identical tracks, on either side of a tubular wall of the cylindrical cam 20.
  • the hitch 24 comprises, in addition to the bar 25, rollers 28 arranged at the ends of the bar 2 and cooperating with the cam path so that, when the toothed sector wheel 14 is rotated, the latter in turn drives the bar 25 in rotation causing, due to the travel of the rollers 28 in the cam path 22, the translation, or at least the back and forth, of the valve 12.
  • the valve 12, the rod 26 and the bar 25 are fixed relative to each other and form a set whose displacement in the direction of the axis A of displacement of the valve 12 responds to the rotation of the toothed sector wheel 14 around the same axis A.
  • a bearing 30, here a ball bearing to allow the rotation of the toothed sector wheel 14 with respect to the cylindrical cam 20.
  • the toothed sector wheel 14 is rotationally integral with a skirt 32 designed to cooperate with the bar 25.
  • This skirt 32 comprises two symmetrical longitudinal walls and extending essentially parallel to the direction A of rotation of the wheel. toothed sector 14 and translation of the valve 12.
  • the two longitudinal walls define between them a housing for the bar 25.
  • the bar 25 is disposed in the housing so that the toothed sector wheel 14 is able to drive in rotation the bar 25 through the longitudinal walls of the skirt 32, and that the bar 25 is free to slide in the housing in the direction of translation of the valve 12.
  • the rotation of the toothed sector wheel 14 causes the rotation of the bar 25 whose rollers 28 then roll on the cam path 22 of the cylindrical cam 20, fixed, which leads to a joint movement.
  • the valve 12 in the direction of the axis A, the displacement of the valve 12 and the rotation of the toothed sector wheel 14, between a position of the valve 12 corresponding to a closing of the valve and at least one position of the valve corresponding to a valve opening, it being understood that at each position of the valve 12 corresponds a single angular position distinct from the toothed sector wheel 14.
  • the toothed sector wheel 14 is connected to the support member by means of a return spring 16 acting in torsion.
  • the opening of the valve 10 is controlled by the rotation of the toothed sector wheel 14, control member, itself caused by the rotation of the motor, actuating member, against a restoring force exerted on the toothed sector wheel 14 by the return spring 16.
  • the return spring 16 is here a helical spring A axis corresponding to the axis of rotation of the toothed sector wheel 14.
  • the return spring 16 is connected at one end to the support member and, at the other end, the toothed sector wheel 14, such that the rotation of the toothed sector wheel 14 controlling the opening of the valve causes a twisting of the return spring 16.
  • the return spring 16 may be connected to the support member in that one of its ends, bent in the opposite direction from the rest of the helical winding of the return spring 16, is received in a hole in the support member or cooperates with a abutment formed for this purpose by the return spring 16.
  • the return spring 16 is here received in a substantially cylindrical housing delimited by the support member, the cylindrical cam 22 and the toothed sector wheel 14.
  • the return spring 16 exerts a return force reminding the toothed sector wheel 14 in its position corresponding to the closed position of the valve.
  • This position of the toothed sector wheel 14 corresponding to the closing of the valve may correspond to a prestressed state of the return spring 16.
  • the return spring 16 exerts a force on the toothed sector wheel 14 tending to rotate it.
  • the rotation of the toothed sector wheel 14 beyond the position corresponding to the closure of the valve is prevented by the fact that the valve 12 is abutting against a valve seat.
  • cam 20 cam 22 we will now describe more precisely the cam 20 cam 22.
  • the axis of the cam is oriented so that the top corresponds to the end of the cam intended to be oriented towards the toothed sector wheel 14 and the bottom corresponds to opposite end of the cam.
  • the inside diameter of the cam 20 is chosen slightly greater than the length of the bar 25 so that the rollers 28 are received in the cam path.
  • the outer diameter of the cam is chosen substantially equal to the length of the coupling.
  • the cam path 22 of the cam 20 here comprises two cam tracks 34, formed by helical grooves delimited by a high helical ramp 36, the closest to the toothed sector wheel 14, and a low helical ramp 38 , opposite to the high helical ramp 36.
  • the two cam tracks 34 are identical, offset by 180 °, to be able to receive the rollers 28 of the hitch 24.
  • the height of the tracks is slightly greater than the diameter of the rollers 28 of the coupling 24.
  • the side wall of the cam 20 is devoid of recesses in the wall, passage of the coupling, opening on the one hand to an axial end of the cam and on the other hand, in the path of cam.
  • the cam 20 thus has an increased mechanical strength.
  • this allows for cam tracks 34 extending over a larger angular sector. This allows, for a given height of the tracks, measured along the axis of the cam 20, to obtain a more high accuracy of the valve.
  • the tracks 34 of the cam path here comprise, at their lower end, a chamfer 40 oriented towards the outside of the cam 20.
  • the opening in the side wall of the cam 20, at this level. end is wider at the radially outer surface of the wall than at the radially inner surface.
  • the opening in the side wall can thus be at this low end, frustoconical, at least in parts.
  • This chamfer makes it possible to engage a wheel of the hitch only in the cam track (the other wheel being for example always outside the cam), then to rotate the hitch to put the second roller next to the cam path.
  • engaging a roller in the cam path is meant here inserting this roller in the cam path from the inside of the cam and projecting it out of the cam 20.
  • the variation of slope at this chamfer 40 at the end of the track 34 of the cam path is substantially continuous, so as not to form a protruding stop which could block hitch during assembly.
  • an opening is made in the side wall of the cam, of diameter greater than the height of the rollers 28.
  • the hitch 24 does not abut laterally in the cam path 22.
  • the stop be made at the valve against the valve seat.
  • the cam 20 comprises two axial grooves 44, made in the radially inner surface of the side wall of the cam 20. These grooves 44 have a narrowing 46 at their outlet on the lower axial end of the cam . These grooves allow the attachment of the cam in a valve body by means of screws. Preferably, for reasons of resistance of the cam, the grooves 46 are, contrary to what is shown, located angularly between the tracks 34 of the cam path 22.
  • the cam 20 forms at its upper axial end, the closest to the toothed sector wheel 14, a housing 48 for receiving a bearing to allow rotation of the toothed sector wheel with respect to the cam 20. .
  • a hitch 24 and a cam 20 are provided. It should be noted here that, preferably, the hitch 24 is provided while the valve stem 26 is already secured to the hitch, the valve stem 26 being preferably provided with the valve 12.
  • the hitch 24 is inserted diagonally into the cam 20, through an axial opening of the cam - here the low opening, opposite to the toothed sector wheel - for engaging a first roller 28 of the hitch 24 in a track of the cam path 22.
  • the roller 28 can be engaged at the lower end of the track 34 of the cam path, the furthest away from the sector wheel toothed.
  • the roller can here be engaged in this end while the coupling is biased because the opening in the side wall of the cam is of greater diameter. It will be noted here that, in the position represented by the coupling, the second roller 28 is outside the cam 20.
  • the hitch 24 is pivoted, the first roller 28 is always engaged in the cam path 22, to place the second roller 28 of the hitch 24 opposite the cam path 22.
  • This pivoting of the hitch 24 is here possible, in particular, because of the chamfer 40 around the opening 42.
  • the presence of the grooves 44 can facilitate this pivoting, because they give more space to maneuver the hitch 24.
  • the first and second rollers 24 of the hitch 24 can then be inserted in the cam path 22, that is to say that the two rollers 28 are each in contact with a helical ramp of a track 34 of the cam path 22. To do this, simply shift the hitch in a plane substantially normal to the axis of the cam 20.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanically-Actuated Valves (AREA)

Abstract

The invention relates to a valve for a motor vehicle including a member (14) for controlling the opening of the valve, which is rotary, a coupling (24) rotatably secured to the control member (14) and including a bar (25), and two freely rotatable rollers (28) at the ends of the bar (25), the rollers (28) being suitable for being guided in a cam (20) with a cam channel (22), and a gate (21) for closing the valve, translatably secured to the coupling (24). The coupling (24) and the cam (20) are shaped such as to allow the skewed insertion of the coupling (24) into the cam (20), from an axial opening of the cam (20), such as to insert one of the rollers (28) only into the cam channel (22) and the rotation of the coupling (24) such as to place the other one of the rollers opposite the cam channel (22).

Description

VANNE À MONTAGE FACILITÉ D'UN ATTELAGE DANS UNE CAME  MOUNTING VALVE FACILITATING A HITCH IN A CAM
L'invention concerne une vanne, notamment une vanne destinée à être mise en œuvre dans le domaine automobile. L'invention vise plus particulièrement une vanne de recirculation des gaz d'échappement, ou vanne EG , de l'anglais « Exhaust Gas Recirculation ». L'invention se rapporte également à un procédé de fabrication d'une telle vanne. The invention relates to a valve, in particular a valve intended to be implemented in the automotive field. The invention more particularly relates to an exhaust gas recirculation valve, or EG valve, of the English "Exhaust Gas Recirculation". The invention also relates to a method of manufacturing such a valve.
Dans le domaine automobile, il est connu de mettre en œuvre des vannes comprenant un organe de commande de l'ouverture de la vanne, par exemple une roue à secteur denté, qui tourne à rencontre d'un ressort de rappel agissant en torsion. Le ressort de rappel permet de rappeler l'organe de commande dans une position déterminée, une fois l'actionnement de l'organe de commande terminé. Le ressort de rappel permet également de maintenir l'organe de commande dans la position déterminée en l'absence d'actionnement, malgré les vibrations auxquelles la vanne peut être soumise.  In the automotive field, it is known to implement valves comprising a valve opening control member, for example a toothed sector wheel, which rotates against a return spring acting in torsion. The return spring removes the control member in a specific position, once the actuation of the control member is completed. The return spring also keeps the control member in the determined position in the absence of actuation, despite the vibrations to which the valve can be subjected.
Une telle vanne peut notamment être du type à soupape se déplaçant en translation ou selon un mouvement hélicoïdal, par rapport à un siège de vanne qu'elle obture sélectivement. Dans ce cas, un dispositif est interposé fonctionnellement entre l'organe de commande et la tige de soupape, qui transforme la rotation de l'organe de commande en translation, respectivement en mouvement hélicoïdal, de la tige de soupape.  Such a valve may in particular be of the valve type moving in translation or in a helical movement, with respect to a valve seat which selectively closes. In this case, a device is interposed functionally between the control member and the valve stem, which transforms the rotation of the control member in translation, respectively in helical movement, of the valve stem.
Il est par exemple connu une vanne EGR de ce type des documents FR-A-2 914 975 ou FR-A-2 947 027, au nom de la Demanderesse. Ces documents décrivent des exemples de vannes de recirculation « EGR » destinées à adapter la quantité de gaz d'échappement réintroduite à l'admission d'un moteur à explosion, pour réduire les émissions polluantes, notamment les émissions d'oxydes d'azote, NOx.  For example, an EGR valve of this type is known from FR-A-2 914 975 or FR-A-2 947 027, in the name of the Applicant. These documents describe examples of recirculation valves "EGR" for adapting the amount of exhaust gas reintroduced to the intake of a combustion engine, to reduce polluting emissions, including emissions of nitrogen oxides, NOx.
La figure 1 illustre une vanne EGR selon la demande FR-A-2 947 027.  Figure 1 illustrates an EGR valve according to FR-A-2 947 027.
La vanne 100 comporte une soupape 102 qui permet l'introduction et le dosage des gaz d'échappement, dans le conduit d'admission d'un moteur à combustion d'un véhicule automobile. La vanne 100 comporte un moteur électrique 104 engrenant une roue de transmission 106. La roue de transmission 106 engrène un organe de commande 108, ici une roue à secteur denté.  The valve 100 comprises a valve 102 which allows the introduction and metering of the exhaust gas into the intake duct of a combustion engine of a motor vehicle. The valve 100 comprises an electric motor 104 meshing with a transmission wheel 106. The transmission wheel 106 meshes with a control member 108, here a toothed sector wheel.
Au moyen d'une came à chemin de came 110, les mouvements de rotation de la roue à secteur denté 108 sont transformés en mouvement de va-et-vient de la soupape 102 par rapport à un siège de vanne. Plus précisément, un attelage 112 est monté dans la came 110, qui est entraîné en rotation par la roue à secteur denté 108. L'attelage 112 comporte un barreau 114 avec un galet 116 libre en rotation à chacune de ses extrémités, chaque galet 116 étant reçu dans une piste respective du chemin de came de la came 110. Une tige de soupape 118 solidaire en translation du barreau 114 et de la soupape 102 permet alors de lever la soupape 102 d'un siège de vanne pour sélectivement ouvrir la vanne 100. By means of a camming cam 110, the rotational movements of the toothed sector wheel 108 are converted into reciprocating movement of the valve 102 relative to a valve seat. More specifically, a hitch 112 is mounted in the cam 110, which is rotated by the toothed sector wheel 108. The hitch 112 comprises a bar 114 with a roller 116 free to rotate at each of its ends, each roller 116 being received in a respective track of the cam path of the cam 110. A valve stem 118 integral in translation with the The bar 114 and the valve 102 then makes it possible to raise the valve 102 of a valve seat to selectively open the valve 100.
En outre, ici, la roue à secteur denté 108 est rappelée en position de fermeture de la vanne 100 par un ressort de rappel 112, agissant en torsion.  In addition, here, the toothed sector wheel 108 is returned to the closed position of the valve 100 by a return spring 112, acting in torsion.
Cependant, le montage de l'attelage 112 dans la came 110 de telle sorte que les galets soient reçus dans le chemin de came peut poser des problèmes.  However, mounting the hitch 112 in the cam 110 so that the rollers are received in the cam path can cause problems.
Ainsi, selon une première façon de procéder, les galets sont assemblés sur le barreau, reçu dans la came, depuis l'extérieur de la came. Cette façon de procéder est cependant complexe.  Thus, according to a first method, the rollers are assembled on the bar, received in the cam from the outside of the cam. This way of proceeding is however complex.
Selon une autre façon de procéder, l'attelage, une fois assemblé, est inséré dans la came, depuis une extrémité axiale de la came, à travers deux évidements dans la paroi latérale de la came, de passage de l'attelage, qui débouchent d'une part à une extrémité axiale de la came et, d'autre part, dans le chemin de came. L'insertion de l'attelage est alors réalisée en le maintenant dans une position où l'axe entre les deux galets est contenu dans un plan normal à l'axe de la came. Cependant, cette façon de procéder reste complexe. Surtout, la présence d'évidements dans la paroi latérale de la came réduit fortement sa résistance mécanique, ce qui est nuisible à la durée de vie de la came.  According to another way of proceeding, the hitch, once assembled, is inserted into the cam, from an axial end of the cam, through two recesses in the side wall of the cam, of passage of the hitch, which open on the one hand at an axial end of the cam and, on the other hand, in the cam path. The insertion of the hitch is then carried out by maintaining it in a position where the axis between the two rollers is contained in a plane normal to the axis of the cam. However, this way of proceeding remains complex. Above all, the presence of recesses in the side wall of the cam greatly reduces its mechanical strength, which is detrimental to the life of the cam.
C'est pourquoi l'invention a pour but de proposer une vanne EG , et de manière plus générale, une vanne, notamment une vanne pour véhicule automobile, ne présentant pas les inconvénients susmentionnés. Notamment, l'invention vise à fournir une vanne dont le montage est facilité.  This is why the invention aims to provide a valve EG, and more generally, a valve, including a valve for a motor vehicle, does not have the aforementioned drawbacks. In particular, the invention aims to provide a valve whose mounting is facilitated.
À cet effet, l'invention propose une vanne, notamment une vanne pour véhicule automobile telle qu'une vanne de recirculation des gaz d'échappement, comprenant :  For this purpose, the invention proposes a valve, in particular a valve for a motor vehicle such as an exhaust gas recirculation valve, comprising:
- un organe de commande de l'ouverture de la vanne, rotatif,  a control member for the opening of the rotary valve,
- un attelage solidaire en rotation de l'organe de commande et comprenant un barreau et deux galets libres en rotation aux extrémités du barreau, les galets étant adaptés à être guidés dans une came à chemin de came, et  a hinge integral in rotation with the control member and comprising a bar and two rollers free to rotate at the ends of the bar, the rollers being adapted to be guided in a cam cam, and
- une soupape de fermeture de la vanne, solidaire en translation de l'attelage,  a valve for closing the valve, integral in translation with the coupling,
l'attelage et la came étant conformés pour permettre l'insertion en biais de l'attelage dans la came, depuis une ouverture axiale de la came, de façon à engager l'un des galets seulement dans le chemin de came, et la rotation de l'attelage pour placer l'autre des galets en regard du chemin de came.  the hitch and the cam being shaped to allow the bias insertion of the hitch in the cam, from an axial opening of the cam, so as to engage one of the rollers only in the cam path, and the rotation the hitch to place the other of the rollers next to the cam path.
Ainsi, avantageusement, le montage de l'attelage dans la vanne est réalisé en quelques étapes simples et rapides, une fois l'attelage assemblé. Une telle vanne est donc plus facile à fabriquer.  Thus, advantageously, the mounting of the hitch in the valve is achieved in a few simple and quick steps, once the hitch assembled. Such a valve is therefore easier to manufacture.
Selon des modes de réalisation préférés, la vanne peut présenter une ou plusieurs des caractéristiques suivantes, prises seules ou en combinaison : - la paroi latérale de la came est dépourvue d'évidement de passage de l'attelage, débouchant d'une part à une extrémité axiale de la came et, d'autre part, dans le chemin de came ; According to preferred embodiments, the valve may have one or more of the following features, taken alone or in combination: - The side wall of the cam is devoid of passage recess of the coupling, opening on the one hand to an axial end of the cam and on the other hand, in the cam path;
- le chemin de came comprend deux pistes, chaque piste s'étendant de préférence sur un secteur angulaire d'au moins 90°, de préférence encore d'au moins 100° ;  the cam path comprises two tracks, each track preferably extending over an angular sector of at least 90 °, more preferably at least 100 °;
- au moins une piste du chemin de came, de préférence les deux pistes du chemin de came, comporte(nt) à une extrémité, de préférence à l'extrémité la plus proche axialement de l'extrémité axiale de la came par laquelle on insert l'attelage, un chanfrein orienté vers l'extérieur de la came ;  at least one track of the cam path, preferably the two tracks of the cam path, comprises at one end, preferably at the end that is axially closest to the axial end of the cam by which the insert is inserted. the hitch, a chamfer facing the outside of the cam;
- la rampe supérieure de la ou des pistes du chemin de came présente, au niveau de l'extrémité présentant un chanfrein, une variation de pente sensiblement continue ;  the upper ramp of the one or more tracks of the cam path has, at the end having a chamfer, a variation of substantially continuous slope;
- une extrémité d'au moins une piste du chemin de came, de préférence une extrémité des deux pistes du chemin de came, comporte une ouverture dans la paroi latérale de la came, de diamètre supérieur au diamètre d'un galet ;  - An end of at least one track of the cam path, preferably one end of the two tracks of the cam path, has an opening in the side wall of the cam, of diameter greater than the diameter of a roller;
- la came comprend au moins une, de préférence au moins deux rainures dans la surface radialement interne de la came, les rainures présentant de préférence un rétrécissement au niveau de leur débouché sur une extrémité axiale de la came ;  - The cam comprises at least one, preferably at least two grooves in the radially inner surface of the cam, the grooves preferably having a narrowing at their outlet on an axial end of the cam;
- la ou les rainures se situent angulairement entre les pistes du chemin de came ; et  - The groove or grooves are angularly between the tracks of the cam path; and
- en position de fermeture de la vanne, l'attelage n'est pas en butée latéralement dans le chemin de came.  - In the closed position of the valve, the hitch is not in abutment laterally in the cam path.
Selon un autre aspect, l'invention se rapporte à un procédé de montage d'une vanne telle que décrite ci-avant dans toutes ses combinaisons, comprenant les étapes consistant à :  According to another aspect, the invention relates to a method of mounting a valve as described above in all its combinations, comprising the steps of:
a) fournir un attelage et une came, de préférence une tige de soupape étant solidarisée à l'attelage, de manière plus préférée avec une soupape fixée à la tige de soupape ;  a) providing a hitch and a cam, preferably a valve stem being secured to the hitch, more preferably with a valve attached to the valve stem;
b) insérer l'attelage de biais dans la came, par une ouverture axiale de la came, pour engager un premier galet de l'attelage dans le chemin de came ;  b) inserting the bias hitch into the cam, through an axial opening of the cam, to engage a first roller of the hitch in the cam path;
c) pivoter l'attelage pour placer le deuxième galet de l'attelage en regard du chemin de came ; d) Insérer les premier et deuxième galets de l'attelage dans le chemin de came ; et e) assembler l'ensemble formé de la came et de l'attelage à un organe de commande.  c) pivot the hitch to place the second hitch roller next to the cam track; d) Insert the first and second rollers of the hitch in the cam path; and e) assembling the assembly formed of the cam and the hitch to a control member.
L'invention sera mieux comprise à la lumière de la description qui va suivre, description faite en référence aux dessins annexés, parmi lesquels :  The invention will be better understood in the light of the description which follows, description given with reference to the appended drawings, among which:
- la figure 1 représente en perspective, une vue partiellement arrachée d'une vanne EGR ; - Figure 1 shows in perspective, a partially cutaway view of an EGR valve;
- les figures 2 et 3 représentent schématiquement en perspective, un dispositif de transformation de mouvements pour une vanne EGR, respectivement en vue éclatée et assemblé ; - les figures 4 et 5 représentent selon des perspectives différentes une came du dispositif de transformation de mouvements des figures 2 et 3 ; - Figures 2 and 3 show schematically in perspective, a motion transformation device for an EGR valve, respectively exploded view and assembled; FIGS. 4 and 5 represent, according to different perspectives, a cam of the motion transformation device of FIGS. 2 and 3;
- la figure 6 représente schématiquement en perspective l'insertion d'un attelage assemblé à une tige de soupape dans la came des figures 4 et 5 ; et  - Figure 6 shows schematically in perspective the insertion of a hitch assembled to a valve stem in the cam of Figures 4 and 5; and
- la figure 7 représente schématiquement en perspective, la came des figures 4 et 5, munie d'un attelage et fixée dans un logement de came prévu à cet effet dans un corps de vanne.  - Figure 7 shows schematically in perspective, the cam of Figures 4 and 5, provided with a hitch and fixed in a cam housing provided for this purpose in a valve body.
Dans la suite, on décrit une vanne, par exemple une vanne EG pour véhicule automobile, dont une portion est illustrée aux figures 2 et 3.  In the following, a valve is described, for example an EG valve for a motor vehicle, a portion of which is illustrated in FIGS. 2 and 3.
Cette vanne comporte une soupape 12 qui permet l'introduction et le dosage d'un fluide, ici les gaz d'échappement, dans une canalisation, ici l'admission. La vanne est du type comprenant un organe de commande 14 tournant (ou rotatif) à rencontre d'un ressort de rappel 16 agissant en torsion.  This valve comprises a valve 12 which allows the introduction and dosing of a fluid, here the exhaust gas, in a pipe, here the intake. The valve is of the type comprising a control member 14 rotating (or rotating) against a return spring 16 acting in torsion.
La vanne comporte tout d'abord un corps de vanne formant un conduit pour les gaz d'échappement à faire recirculer. Le corps de vanne peut également former un conduit pour une circulation d'eau de refroidissement de la vanne. Le corps peut présenter des trous de fixation de la vanne à un bloc motopropulseur d'un véhicule automobile. De tels trous de fixation peuvent notamment être réalisés dans des collerettes entourant les débouchés du conduit de circulation d'eau de refroidissement permettant ainsi d'intégrer le conduit de circulation d'eau de refroidissement de la vanne dans le conduit de circulation d'eau de refroidissement du moteur sur laquelle la vanne est fixée. De tels trous de fixation peuvent également être réalisés dans des collerettes entourant les débouchés d'un conduit de recirculation de gaz d'échappement.  The valve first comprises a valve body forming a conduit for the exhaust gas to be recirculated. The valve body may also form a conduit for cooling water circulation of the valve. The body may have valve mounting holes to a power unit of a motor vehicle. Such fixing holes may in particular be made in flanges surrounding the outlets of the cooling water circulation duct, thus making it possible to integrate the cooling water circulation duct of the valve into the water circulation duct. engine cooling on which the valve is attached. Such fixing holes may also be made in flanges surrounding the outlets of an exhaust gas recirculation duct.
La vanne comporte également un moteur qui peut être monté dans un logement formé par le corps de vanne. Le moteur engrène une roue de transmission. La roue de transmission engrène à son tour l'organe de commande 14, ici une roue à secteur denté. Le moteur est ainsi adapté à entraîner en rotation la roue à secteur denté 14.  The valve also includes a motor that can be mounted in a housing formed by the valve body. The engine meshes with a transmission wheel. The transmission wheel in turn engages the control member 14, here a toothed sector wheel. The motor is thus adapted to rotate the toothed sector wheel 14.
Le mouvement de rotation de la roue à secteur denté 14 est transformé en mouvement de va-et-vient de la soupape 12 grâce à un dispositif de transformation de mouvements 18. Par mouvement de va-et-vient, on entend ici un mouvement comprenant une translation selon un axe, éventuellement combinée à une rotation par rapport à ce même axe.  The rotational movement of the toothed sector wheel 14 is converted into a reciprocating movement of the valve 12 by means of a motion-transforming device 18. By reciprocating movement, here is meant a movement comprising a translation along an axis, possibly combined with a rotation with respect to this same axis.
Le dispositif de transformation de mouvements 18 comporte à cet effet, à l'intérieur d'un organe support formé par le corps de vanne, une came 20 à chemin de came 22 (ou came cylindrique), un attelage 24 coopérant avec le chemin de came 22 de la came cylindrique 20, l'attelage 24 comprenant un barreau 25 fixé à l'extrémité d'une tige 26 solidaire de la soupape 12. Pour guider la tige 26 dans le corps de vanne, il peut être prévu un ou plusieurs paliers entre la tige 26 et le corps de vanne. Il peut être prévu un jeu entre la tige 26 et le barreau 25 pour permettre une rotation de la tige par rapport au barreau, autour de l'axe de la tige, le barreau et la tige étant solidaire en translation selon la direction de l'axe de la tige. For this purpose, the movement transformation device 18 comprises, inside a support member formed by the valve body, a cam-shaped cam 22 (or cylindrical cam), a hitch 24 cooperating with the path of the cam. cam 22 of the cylindrical cam 20, the hitch 24 comprising a bar 25 fixed to the end of a rod 26 integral with the valve 12. To guide the rod 26 in the valve body, it can be provided one or more bearings between the rod 26 and the valve body. It can be provided a clearance between the rod 26 and the bar 25 to allow a rotation of the rod relative to the bar, around the axis of the rod, the bar and the rod being integral in translation in the direction of the axis of the rod.
Le chemin de came 22 est ici formé de deux pistes identiques, de part et d'autre d'une paroi tubulaire de la came cylindrique 20. L'attelage 24 comporte, outre le barreau 25, des galets 28 disposés aux extrémités du barreau 2 et coopérant avec le chemin de came de sorte que, lorsque la roue à secteur denté 14 est entraînée en rotation, celle-ci entraîne à son tour le barreau 25 en rotation provoquant, grâce au parcours des galets 28 dans le chemin de came 22, la translation, ou tout du moins le va-et-vient, de la soupape 12. La soupape 12, la tige 26 et le barreau 25 sont fixes les uns par rapport à aux autres et forment un ensemble dont le déplacement dans la direction de l'axe A de déplacement de la soupape 12 répond à la rotation de la roue à secteur denté 14 autour de ce même axe A.  The cam path 22 is here formed of two identical tracks, on either side of a tubular wall of the cylindrical cam 20. The hitch 24 comprises, in addition to the bar 25, rollers 28 arranged at the ends of the bar 2 and cooperating with the cam path so that, when the toothed sector wheel 14 is rotated, the latter in turn drives the bar 25 in rotation causing, due to the travel of the rollers 28 in the cam path 22, the translation, or at least the back and forth, of the valve 12. The valve 12, the rod 26 and the bar 25 are fixed relative to each other and form a set whose displacement in the direction of the axis A of displacement of the valve 12 responds to the rotation of the toothed sector wheel 14 around the same axis A.
Entre la roue à secteur denté 14 et la came cylindrique 20, il est disposé un palier 30, ici un roulement à billes, pour permettre la rotation de la roue à secteur denté 14 par rapport à la came cylindrique 20.  Between the toothed sector wheel 14 and the cylindrical cam 20, there is arranged a bearing 30, here a ball bearing, to allow the rotation of the toothed sector wheel 14 with respect to the cylindrical cam 20.
Par ailleurs, la roue à secteur denté 14 est solidaire en rotation d'une jupe 32 prévue pour coopérer avec le barreau 25. Cette jupe 32 comporte deux parois longitudinales symétriques et s'étendant essentiellement parallèlement à la direction A de rotation de la roue à secteur denté 14 et de translation de la soupape 12. Les deux parois longitudinales définissent entre elles un logement pour le barreau 25. Ainsi, le barreau 25 est disposé dans le logement de sorte que la roue à secteur denté 14 soit apte à entraîner en rotation le barreau 25 par l'intermédiaire des parois longitudinales de la jupe 32, et que le barreau 25 soit libre de coulisser dans le logement dans la direction de translation de la soupape 12.  Furthermore, the toothed sector wheel 14 is rotationally integral with a skirt 32 designed to cooperate with the bar 25. This skirt 32 comprises two symmetrical longitudinal walls and extending essentially parallel to the direction A of rotation of the wheel. toothed sector 14 and translation of the valve 12. The two longitudinal walls define between them a housing for the bar 25. Thus, the bar 25 is disposed in the housing so that the toothed sector wheel 14 is able to drive in rotation the bar 25 through the longitudinal walls of the skirt 32, and that the bar 25 is free to slide in the housing in the direction of translation of the valve 12.
Par conséquent, au sein de la vanne, la rotation de la roue à secteur denté 14 entraîne la rotation du barreau 25 dont les galets 28 roulent alors sur le chemin de came 22 de la came cylindrique 20, fixe, ce qui entraîne conjointement un mouvement de la soupape 12 dans la direction de l'axe A, de déplacement de la soupape 12 et de rotation de la roue à secteur denté 14, entre une position de la soupape 12 correspondant à une fermeture de la vanne et au moins une position de la soupape correspondant à une ouverture de vanne, étant entendu qu'à chaque position de la soupape 12 correspond une unique position angulaire distincte de la roue à secteur denté 14.  Therefore, within the valve, the rotation of the toothed sector wheel 14 causes the rotation of the bar 25 whose rollers 28 then roll on the cam path 22 of the cylindrical cam 20, fixed, which leads to a joint movement. of the valve 12 in the direction of the axis A, the displacement of the valve 12 and the rotation of the toothed sector wheel 14, between a position of the valve 12 corresponding to a closing of the valve and at least one position of the valve corresponding to a valve opening, it being understood that at each position of the valve 12 corresponds a single angular position distinct from the toothed sector wheel 14.
Pour rappeler la soupape 12 en position de fermeture de la vanne, et/ou la maintenir dans cette position en l'absence d'actionnement par le moteur, la roue à secteur denté 14 est reliée à l'organe de support au moyen d'un ressort de rappel 16 agissant en torsion. Ainsi, l'ouverture de la vanne 10 est commandée par la rotation de la roue à secteur denté 14, organe de commande, elle- même provoquée par la rotation du moteur, organe d'actionnement, à rencontre d'une force de rappel exercée sur la roue à secteur denté 14 par le ressort de rappel 16. Le ressort de rappel 16 est ici un ressort hélicoïdal d'axe A correspondant à l'axe de rotation de la roue à secteur denté 14. Le ressort de rappel 16 est relié, à une extrémité, à l'organe de support et, à l'autre extrémité, à la roue à secteur denté 14, de telle sorte de la rotation de la roue à secteur denté 14 commandant l'ouverture de la vanne provoque une torsion du ressort de rappel 16. En particulier, le ressort de rappel 16 peut être relié à l'organe support du fait qu'une de ses extrémités, pliée dans le sens opposé du reste de l'enroulement hélicoïdal du ressort de rappel 16, est reçue dans un trou dans l'organe de support ou coopère avec une butée formée à cet effet par le ressort de rappel 16. Le ressort de rappel 16 est ici reçu dans un logement sensiblement cylindrique délimité par l'organe de support, la came cylindrique 22 et la roue à secteur denté 14. To recall the valve 12 in the closed position of the valve, and / or maintain it in this position in the absence of actuation by the engine, the toothed sector wheel 14 is connected to the support member by means of a return spring 16 acting in torsion. Thus, the opening of the valve 10 is controlled by the rotation of the toothed sector wheel 14, control member, itself caused by the rotation of the motor, actuating member, against a restoring force exerted on the toothed sector wheel 14 by the return spring 16. The return spring 16 is here a helical spring A axis corresponding to the axis of rotation of the toothed sector wheel 14. The return spring 16 is connected at one end to the support member and, at the other end, the toothed sector wheel 14, such that the rotation of the toothed sector wheel 14 controlling the opening of the valve causes a twisting of the return spring 16. In particular, the return spring 16 may be connected to the support member in that one of its ends, bent in the opposite direction from the rest of the helical winding of the return spring 16, is received in a hole in the support member or cooperates with a abutment formed for this purpose by the return spring 16. The return spring 16 is here received in a substantially cylindrical housing delimited by the support member, the cylindrical cam 22 and the toothed sector wheel 14.
Le moteur coupé, le ressort de rappel 16 exerce un effort de rappel rappelant la roue à secteur denté 14 dans sa position correspondant à la position de fermeture de la vanne. Cette position de la roue à secteur denté 14 correspondant à la fermeture de la vanne peut correspondre à un état précontraint du ressort de rappel 16. En d'autres termes, dans la position de la roue à secteur denté 14 correspondant à la fermeture de la vanne, le ressort de rappel 16 exerce un effort sur la roue à secteur denté 14 tendant à la faire tourner. Cependant, la rotation de la roue à secteur denté 14 au-delà de la position correspondant à la fermeture de la vanne est empêchée du fait que la soupape 12 est en buté contre un siège de vanne.  With the engine off, the return spring 16 exerts a return force reminding the toothed sector wheel 14 in its position corresponding to the closed position of the valve. This position of the toothed sector wheel 14 corresponding to the closing of the valve may correspond to a prestressed state of the return spring 16. In other words, in the position of the toothed sector wheel 14 corresponding to the closure of the valve, the return spring 16 exerts a force on the toothed sector wheel 14 tending to rotate it. However, the rotation of the toothed sector wheel 14 beyond the position corresponding to the closure of the valve is prevented by the fact that the valve 12 is abutting against a valve seat.
On va maintenant décrire plus précisément la came 20 à chemin de came 22.  We will now describe more precisely the cam 20 cam 22.
Dans la suite, à fin de simplicité de la description, on oriente l'axe de la came de sorte que le haut correspond à l'extrémité de la came destinée à être orientée vers la roue à secteur denté 14 et le bas correspond à l'extrémité opposée de la came.  In the following, to simplify the description, the axis of the cam is oriented so that the top corresponds to the end of the cam intended to be oriented towards the toothed sector wheel 14 and the bottom corresponds to opposite end of the cam.
Tout d'abord, ici, le diamètre intérieur de la came 20 est choisi légèrement supérieur à la longueur du barreau 25 pour que les galets 28 soient reçus dans le chemin de came. Pour les mêmes raisons, le diamètre extérieur de la came est choisi sensiblement égal à la longueur de l'attelage.  First, here, the inside diameter of the cam 20 is chosen slightly greater than the length of the bar 25 so that the rollers 28 are received in the cam path. For the same reasons, the outer diameter of the cam is chosen substantially equal to the length of the coupling.
Par ailleurs, le chemin de came 22 de la came 20 comporte ici deux pistes de came 34, formées par des rainures hélicoïdales délimitées par une rampe hélicoïdale haute 36, la plus proche de la roue à secteur denté 14, et une rampe hélicoïdale basse 38, opposée à la rampe hélicoïdale haute 36. Les deux pistes de came 34 sont identiques, décalées de 180°, pour pouvoir recevoir les galets 28 de l'attelage 24. La hauteur des pistes est légèrement supérieure au diamètre des galets 28 de l'attelage 24.  Furthermore, the cam path 22 of the cam 20 here comprises two cam tracks 34, formed by helical grooves delimited by a high helical ramp 36, the closest to the toothed sector wheel 14, and a low helical ramp 38 , opposite to the high helical ramp 36. The two cam tracks 34 are identical, offset by 180 °, to be able to receive the rollers 28 of the hitch 24. The height of the tracks is slightly greater than the diameter of the rollers 28 of the coupling 24.
On peut noter ici que la paroi latérale de la came 20 est dépourvue d'évidements dans la paroi, de passage de l'attelage, débouchant d'une part à une extrémité axiale de la came et, d'autre part, dans le chemin de came. La came 20 présente ainsi une résistance mécanique accrue. En outre, cela permet de réaliser des pistes de came 34 s'étendant sur un plus grand secteur angulaire. Ceci permet, pour une hauteur donnée des pistes, mesurée selon l'axe de la came 20, d'obtenir une plus grande précision de la vanne. Ici, notamment, on peut réaliser des pistes qui s'étendent sur au moins 90°, voire sur au moins 100°. It may be noted here that the side wall of the cam 20 is devoid of recesses in the wall, passage of the coupling, opening on the one hand to an axial end of the cam and on the other hand, in the path of cam. The cam 20 thus has an increased mechanical strength. In addition, this allows for cam tracks 34 extending over a larger angular sector. This allows, for a given height of the tracks, measured along the axis of the cam 20, to obtain a more high accuracy of the valve. Here, in particular, it is possible to make tracks which extend over at least 90 ° or even over at least 100 °.
Par ailleurs, les pistes 34 du chemin de came, comportent ici, à leur extrémité basse, un chanfrein 40 orienté vers l'extérieur de la came 20. Ainsi, l'ouverture dans la paroi latérale de la came 20, au niveau de cette extrémité, est plus large au niveau de la surface radialement externe de la paroi qu'au niveau de la surface radialement interne. L'ouverture dans la paroi latérale peut ainsi être, au niveau de cette extrémité basse, tronconique, au moins par parties. Ce chanfrein permet d'engager un galet de l'attelage, seulement, dans le chemin de came (l'autre galet étant par exemple toujours à l'extérieur de la came), puis de faire pivoter l'attelage pour mettre le deuxième galet en regard du chemin de came. Par « engager un galet dans le chemin de came », on entend ici insérer ce galet dans le chemin de came depuis l'intérieur de la came et lui faire faire saillie hors de la came 20.  Furthermore, the tracks 34 of the cam path, here comprise, at their lower end, a chamfer 40 oriented towards the outside of the cam 20. Thus, the opening in the side wall of the cam 20, at this level. end, is wider at the radially outer surface of the wall than at the radially inner surface. The opening in the side wall can thus be at this low end, frustoconical, at least in parts. This chamfer makes it possible to engage a wheel of the hitch only in the cam track (the other wheel being for example always outside the cam), then to rotate the hitch to put the second roller next to the cam path. By "engaging a roller in the cam path" is meant here inserting this roller in the cam path from the inside of the cam and projecting it out of the cam 20.
Plus précisément, au niveau de la rampe supérieure 36, la variation de pente au niveau de ce chanfrein 40 à l'extrémité de la piste 34 du chemin de came est sensiblement continue, ceci afin de ne pas former une arrête saillante qui risquerait de bloquer l'attelage lors du montage.  More precisely, at the level of the upper ramp 36, the variation of slope at this chamfer 40 at the end of the track 34 of the cam path is substantially continuous, so as not to form a protruding stop which could block hitch during assembly.
Par ailleurs, au niveau de l'extrémité basse des pistes 34 du chemin de came 22, une ouverture est réalisée dans la paroi latérale de la came, de diamètre supérieur à la hauteur des galets 28. Il est à noter que, de préférence, en position de fermeture de la vanne, l'attelage 24 n'est pas en butée latéralement dans le chemin de came 22. Par exemple, en position de fermeture de la vanne, on préfère que la butée se fasse au niveau de la soupape contre le siège de vanne. Par suite, il n'est pas gênant d'avoir une ouverture élargie au niveau de l'extrémité basse de la piste du chemin de came. En effet, on s'arrange pour que la course de l'attelage dans le chemin de came s'arrête avant l'élargissement de la hauteur de la piste du chemin de came.  Moreover, at the lower end of the tracks 34 of the cam path 22, an opening is made in the side wall of the cam, of diameter greater than the height of the rollers 28. It should be noted that, preferably, in the closed position of the valve, the hitch 24 does not abut laterally in the cam path 22. For example, in the closed position of the valve, it is preferred that the stop be made at the valve against the valve seat. As a result, it is not a problem to have an enlarged opening at the low end of the cam track. Indeed, it is arranged for the stroke of the hitch in the cam path stops before widening the height of the track of the cam path.
L'ouverture élargie au niveau de l'extrémité basse des pistes du chemin de came et le chanfrein autour de cette ouverture permettent comme cela sera décrit plus en détails par la suite, l'insertion de l'attelage dans le chemin de came, depuis l'extrémité basse de la came, opposée à la roue à secteur denté, en biais, de façon à engager l'un des galets seulement dans le chemin de came, et la rotation de l'attelage pour placer l'autre des galets en regard du chemin de came. Ceci permet de monter plus aisément l'attelage dans la came, même quand l'attelage est déjà solidarisé à la tige de soupape 26, munie ou non de la soupape 12.  The widened opening at the low end of the tracks of the cam path and the chamfer around this opening allow as will be described in more detail later, the insertion of the hitch in the cam path, since the lower end of the cam, opposite the toothed sector wheel, at an angle, so as to engage one of the rollers only in the cam path, and the rotation of the hitch to place the other of the rollers in look at the cam path. This makes it possible to mount the hitch more easily in the cam, even when the hitch is already secured to the valve stem 26, provided or not with the valve 12.
Par ailleurs, ici, la came 20 comprend deux rainures 44 axiales, réalisées dans la surface radialement interne de la paroi latérale de la came 20. Ces rainures 44 présentent un rétrécissement 46 au niveau de leur débouché sur l'extrémité axiale basse de la came. Ces rainures permettent la fixation de la came dans un corps de vanne au moyen de vis. De préférence, pour des raisons de résistance de la came, les rainures 46 sont, contrairement à ce qui est représenté, situées angulairement entre les pistes 34 du chemin de came 22. Enfin, la came 20 forme au niveau de son extrémité axiale haute, la plus proche de la roue à secteur denté 14, un logement 48 de réception d'un roulement pour permettre la rotation de la roue à secteur dentée par rapport à la came 20. Furthermore, here, the cam 20 comprises two axial grooves 44, made in the radially inner surface of the side wall of the cam 20. These grooves 44 have a narrowing 46 at their outlet on the lower axial end of the cam . These grooves allow the attachment of the cam in a valve body by means of screws. Preferably, for reasons of resistance of the cam, the grooves 46 are, contrary to what is shown, located angularly between the tracks 34 of the cam path 22. Finally, the cam 20 forms at its upper axial end, the closest to the toothed sector wheel 14, a housing 48 for receiving a bearing to allow rotation of the toothed sector wheel with respect to the cam 20. .
On va maintenant décrire en regard des figures 6 et 7, un procédé de montage d'une vanne telle qu'elle vient d'être décrite.  We will now describe with reference to Figures 6 and 7, a method of mounting a valve as just described.
Dans un premier temps, on fournit un attelage 24 et une came 20. Il est à noter ici que de préférence, l'attelage 24 est fourni alors que la tige de soupape 26 est déjà solidarisée à l'attelage, la tige de soupape 26 étant de manière préférée munie de la soupape 12.  Firstly, a hitch 24 and a cam 20 are provided. It should be noted here that, preferably, the hitch 24 is provided while the valve stem 26 is already secured to the hitch, the valve stem 26 being preferably provided with the valve 12.
Dans un deuxième temps, qu'illustre plus particulièrement la figure 6, on insère l'attelage 24 de biais dans la came 20, par une ouverture axiale de la came - ici l'ouverture basse, opposée à la roue à secteur dentée - pour engager un premier galet 28 de l'attelage 24 dans une piste du chemin de came 22. Ici le galet 28 peut être engagé au niveau de l'extrémité basse de la piste 34 du chemin de came, la plus éloignée de la roue à secteur dentée. Le galet peut ici être engagé dans cette extrémité alors que l'attelage est de biais car l'ouverture dans la paroi latérale de la came y est de diamètre supérieur. On note ici que, dans la position représentée de l'attelage, le deuxième galet 28 est à l'extérieur de la came 20.  In a second step, which is illustrated more particularly in FIG. 6, the hitch 24 is inserted diagonally into the cam 20, through an axial opening of the cam - here the low opening, opposite to the toothed sector wheel - for engaging a first roller 28 of the hitch 24 in a track of the cam path 22. Here the roller 28 can be engaged at the lower end of the track 34 of the cam path, the furthest away from the sector wheel toothed. The roller can here be engaged in this end while the coupling is biased because the opening in the side wall of the cam is of greater diameter. It will be noted here that, in the position represented by the coupling, the second roller 28 is outside the cam 20.
Ensuite, on fait pivoter l'attelage 24, le premier galet 28 étant toujours engager dans le chemin de came 22, pour placer le deuxième galet 28 de l'attelage 24 en regard du chemin de came 22. Ce pivotement de l'attelage 24 est ici possible, notamment, du fait du chanfrein 40 autour de l'ouverture 42. En outre, la présence des rainures 44 peut faciliter ce pivotement, car elles donnent plus d'espace pour manœuvrer l'attelage 24.  Then, the hitch 24 is pivoted, the first roller 28 is always engaged in the cam path 22, to place the second roller 28 of the hitch 24 opposite the cam path 22. This pivoting of the hitch 24 is here possible, in particular, because of the chamfer 40 around the opening 42. In addition, the presence of the grooves 44 can facilitate this pivoting, because they give more space to maneuver the hitch 24.
On peut ensuite insérer les premier et deuxième galets 24 de l'attelage 24 dans le chemin de came 22, c'est-à-dire qu'alors les deux galets 28 sont en contact chacun avec une rampe hélicoïdale d'une piste 34 du chemin de came 22. Pour ce faire, il suffit de décaler l'attelage dans un plan sensiblement normal à l'axe de la came 20.  The first and second rollers 24 of the hitch 24 can then be inserted in the cam path 22, that is to say that the two rollers 28 are each in contact with a helical ramp of a track 34 of the cam path 22. To do this, simply shift the hitch in a plane substantially normal to the axis of the cam 20.
On peut alors fixer l'ensemble ainsi formé dans un logement prévu à cet effet dans un corps de vanne formant un conduit sélectivement obturé par la soupape 12. Ici, cette fixation est réalisée au moyen de vis 50 que l'on glisse dans les rainures 44, la tête de vis venant en appui sur une surface de la came formée par le rétrécissement 46 au niveau du débouché de ces rainures 44.  We can then fix the assembly thus formed in a housing provided for this purpose in a valve body forming a pipe selectively closed by the valve 12. Here, this fixing is carried out by means of screws 50 that slide in the grooves 44, the screw head bearing on a surface of the cam formed by the narrowing 46 at the outlet of these grooves 44.
On peut alors fixer à l'ensemble formé d'au moins la came et l'attelage, la roue à secteur 14, de sorte que la jupe 32 coopère avec l'attelage 24.  It is then possible to attach to the assembly formed of at least the cam and the hitch, the sector wheel 14, so that the skirt 32 cooperates with the hitch 24.
Bien entendu, la présente invention ne se limite pas à la description ci-dessus. De nombreuses variantes de réalisation sont accessibles à l'homme de l'art, dans le cadre de l'invention définie par le jeu de revendications ci-joint.  Of course, the present invention is not limited to the above description. Many alternative embodiments are accessible to those skilled in the art, in the context of the invention defined by the attached set of claims.
En particulier, de nombreuses autres géométries de la came et de l'attelage, accessibles à l'homme de l'art, permettent l'insertion de cet attelage dans la came de biais, tel que cela a été décrit. In particular, many other geometries of the cam and the hitch, accessible to those skilled in the art, allow the insertion of this hitch in the bias cam, as has been described.

Claims

REVENDICATIONS
Vanne, notamment vanne pour véhicule automobile telle qu'une vanne de recirculation des gaz d'échappement, comprenant Valve, especially a valve for a motor vehicle such as an exhaust gas recirculation valve, comprising
un organe de commande (14) de l'ouverture de la vanne, rotatif, a control member (14) for opening the valve, rotary,
un attelage (24) solidaire en rotation de l'organe de commande (14) et comprenant un barreau (25) et deux galets (28) libres en rotation aux extrémités du barreau (25), les galets (28) étant adaptés à être guidés dans une came (20) à chemin de came (22), et une soupape (12) de fermeture de la vanne, solidaire en translation de l'attelage (24), dans laquelle la paroi latérale de la came (20) est dépourvue d'évidement de passage de l'attelage (24), débouchant d'une part à une extrémité axiale de la came et, d'autre part, dans le chemin de came. a hitch (24) integral in rotation with the control member (14) and comprising a bar (25) and two rollers (28) free to rotate at the ends of the bar (25), the rollers (28) being adapted to be guided in a cam path cam (20) (22), and a valve (12) closing the valve, integral in translation with the coupling (24), wherein the side wall of the cam (20) is devoid of passage recess of the coupling (24), opening on the one hand to an axial end of the cam and on the other hand, in the cam path.
Vanne selon la revendication 1, dans laquelle le chemin de came (22) comprend deux pistes (34), chaque piste (34) s'étendant de préférence sur un secteur angulaire d'au moins 90°, de préférence encore d'au moins 100°. Valve according to claim 1, wherein the cam path (22) comprises two tracks (34), each track (34) preferably extending over an angular sector of at least 90 °, more preferably at least 100 °.
Vanne selon l'une des revendications 1 ou 2, dans laquelle au moins une piste (34) du chemin de came (22), de préférence les deux pistes (34) du chemin de came (22), comporte(nt) à une extrémité, de préférence à l'extrémité la plus proche axialement de l'extrémité axiale de la came par laquelle on insert l'attelage (24), un chanfrein (40) orienté vers l'extérieur de la came. Valve according to one of claims 1 or 2, wherein at least one track (34) of the cam path (22), preferably the two tracks (34) of the cam path (22), comprises (s) a end, preferably at the end axially closest to the axial end of the cam by which the hitch (24) is inserted, a chamfer (40) facing outwardly of the cam.
Vanne selon la revendication 3, dans laquelle la rampe supérieure (36) de la ou des pistes (34) du chemin de came (22) présente, au niveau de l'extrémité présentant un chanfrein (40), une variation de pente sensiblement continue. Valve according to claim 3, wherein the upper ramp (36) of the track (s) (34) of the cam path (22) has, at the end having a chamfer (40), a substantially continuous slope variation. .
Vanne selon l'une quelconque des revendications précédentes, dans laquelle une extrémité d'au moins une piste (34) du chemin de came (22), de préférence une extrémité des deux pistes (34) du chemin de came (22), comporte une ouverture dans la paroi latérale de la came (20), de diamètre supérieur au diamètre d'un galet (28). A valve according to any one of the preceding claims, wherein an end of at least one track (34) of the cam path (22), preferably one end of the two tracks (34) of the cam path (22), comprises an opening in the side wall of the cam (20), of diameter greater than the diameter of a roller (28).
Vanne selon l'une quelconque des revendications précédentes, dans laquelle la came (20) comprend au moins une, de préférence au moins deux rainures (44) dans la surface radialement interne de la came (20), les rainures (44) présentant de préférence un rétrécissement (46) au niveau de leur débouché sur une extrémité axiale de la came (20). Valve according to any one of the preceding claims, wherein the cam (20) comprises at least one, preferably at least two grooves (44) in the radially inner surface of the cam (20), the grooves (44) having preferably a narrowing (46) at their outlet on an axial end of the cam (20).
7. Vanne selon la revendication 6, dans laquelle la ou les rainures (44) se situent angulairement entre les pistes (34) du chemin de came (22). 7. Valve according to claim 6, wherein the groove or grooves (44) are angularly between the tracks (34) of the cam path (22).
8. Vanne selon l'une quelconque des revendications précédentes, dans laquelle en position de fermeture de la vanne, l'attelage (24) n'est pas en butée latéralement dans le chemin de came (22). 8. Valve according to any one of the preceding claims, wherein in the closed position of the valve, the coupling (24) does not abut laterally in the cam path (22).
9. Procédé de montage d'une vanne selon l'une quelconque des revendications précédentes, comprenant les étapes consistant à : The method of mounting a valve according to any one of the preceding claims, comprising the steps of:
a) fournir un attelage (24) et une came (20), de préférence une tige de soupape (26) étant solidarisée à l'attelage (24), de manière plus préférée avec une soupape (12) fixée à la tige de soupape (26) ;  a) providing a hitch (24) and a cam (20), preferably a valve stem (26) being secured to the hitch (24), more preferably with a valve (12) attached to the valve stem (26);
b) insérer l'attelage (24) de biais dans la came (20), par une ouverture axiale de la came, pour engager un premier galet (28) de l'attelage dans le chemin de came (22) ;  b) inserting the hitch (24) biased into the cam (20), through an axial opening of the cam, to engage a first roller (28) of the hitch in the cam path (22);
c) pivoter l'attelage (24) pour placer le deuxième galet (28) de l'attelage (24) en regard du chemin de came (22) ;  c) pivoting the hitch (24) to place the second roller (28) of the hitch (24) facing the cam path (22);
d) Insérer les premier et deuxième galets (28) de l'attelage (24) dans le chemin de came (22) ; et  d) inserting the first and second rollers (28) of the hitch (24) into the cam path (22); and
e) assembler l'ensemble formé de la came (20) et de l'attelage (24) à un organe de  e) assembling the assembly formed of the cam (20) and the coupling (24) with a member of
commande (14).  control (14).
PCT/FR2015/050832 2014-04-01 2015-03-31 Valve with easy assembly of a coupling in a cam WO2015150692A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15717049.9A EP3132169A1 (en) 2014-04-01 2015-03-31 Valve with easy assembly of a coupling in a cam

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1452884A FR3019248B1 (en) 2014-04-01 2014-04-01 MOUNTING VALVE FACILITATES HITCHING IN A CAM
FR1452884 2014-04-01

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WO2015150692A1 true WO2015150692A1 (en) 2015-10-08

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3065042B1 (en) * 2017-04-11 2019-06-28 Valeo Systemes De Controle Moteur DEVICE FOR MAINTAINING A BEARING

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1001629A (en) * 1963-03-18 1965-08-18 Rotork Eng Co Ltd Improvements in or relating to actuating mechanisms, more particularly for fluid flow control valves
EP1342907A2 (en) * 2002-03-02 2003-09-10 Pierburg GmbH Valve system
FR2914975A1 (en) 2007-04-16 2008-10-17 Valeo Sys Controle Moteur Sas DEVICE FOR TRANSFORMING A PIVOT MOTION OF A GEAR INTO A TRANSLATION MOVEMENT OF A SLIDER AND VALVE COMPRISING SUCH A DEVICE
WO2010146121A1 (en) * 2009-06-17 2010-12-23 Valeo Systemes De Controle Moteur Valve comprising a movement transformation device
FR2947027A1 (en) 2009-06-17 2010-12-24 Valeo Sys Controle Moteur Sas MOVEMENT TRANSFORMATION DEVICE AND VALVE HAVING SUCH A DEVICE
FR2947026A1 (en) * 2009-06-17 2010-12-24 Valeo Sys Controle Moteur Sas Device for use in exhaust gas recirculation system of thermal engine of motor vehicle to transform rotational movement of wheel into translation movement of valve element, has cam passage connected to valve element

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1001629A (en) * 1963-03-18 1965-08-18 Rotork Eng Co Ltd Improvements in or relating to actuating mechanisms, more particularly for fluid flow control valves
EP1342907A2 (en) * 2002-03-02 2003-09-10 Pierburg GmbH Valve system
FR2914975A1 (en) 2007-04-16 2008-10-17 Valeo Sys Controle Moteur Sas DEVICE FOR TRANSFORMING A PIVOT MOTION OF A GEAR INTO A TRANSLATION MOVEMENT OF A SLIDER AND VALVE COMPRISING SUCH A DEVICE
WO2010146121A1 (en) * 2009-06-17 2010-12-23 Valeo Systemes De Controle Moteur Valve comprising a movement transformation device
FR2947027A1 (en) 2009-06-17 2010-12-24 Valeo Sys Controle Moteur Sas MOVEMENT TRANSFORMATION DEVICE AND VALVE HAVING SUCH A DEVICE
FR2947026A1 (en) * 2009-06-17 2010-12-24 Valeo Sys Controle Moteur Sas Device for use in exhaust gas recirculation system of thermal engine of motor vehicle to transform rotational movement of wheel into translation movement of valve element, has cam passage connected to valve element

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EP3132169A1 (en) 2017-02-22
FR3019248B1 (en) 2017-09-01

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