EP1966509A2 - Flywheel comprising means for damping oscillations thereof - Google Patents
Flywheel comprising means for damping oscillations thereofInfo
- Publication number
- EP1966509A2 EP1966509A2 EP06842107A EP06842107A EP1966509A2 EP 1966509 A2 EP1966509 A2 EP 1966509A2 EP 06842107 A EP06842107 A EP 06842107A EP 06842107 A EP06842107 A EP 06842107A EP 1966509 A2 EP1966509 A2 EP 1966509A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- flywheel
- hub
- inertial mass
- annular
- damping member
- 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- Withdrawn
Links
Classifications
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- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
- F16F15/131—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses
- F16F15/13142—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses characterised by the method of assembly, production or treatment
- F16F15/1315—Multi-part primary or secondary masses, e.g. assembled from pieces of sheet steel
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- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
- F16F15/131—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses
- F16F15/13107—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses for damping of axial or radial, i.e. non-torsional vibrations
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- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2222/00—Special physical effects, e.g. nature of damping effects
- F16F2222/04—Friction
Definitions
- This invention relates generally to engine flywheels. BACKGROUND OF THE INVENTION It relates more particularly to a flywheel of a torque transmission device of an engine which comprises a hub and an annular inertial mass of larger diameter than the hub and integral with this hub, and damping means oscillations of the annular inertial mass with respect to this hub, comprising at least one damping member connecting the hub to the annular inertial mass and able to deform elastically in the direction of the axis of rotation of the flywheel.
- the invention finds a particularly advantageous application for flexible type flywheels.
- the flexibility of the flywheel can cause, by bending of the inertial mass, deflections of the flywheel in the axial direction of the drive shaft which exceed the tolerable limit. This results in mechanical strength problems of the flywheel and the clutch disc that cooperates with the flywheel.
- the damping member is attached with a fastening system on the hub and is located between the hub and the inertial mass of the flywheel.
- the damping device is mounted in the flywheel during the assembly of the hub and the flywheel flywheel mass.
- the inertial mass and the hub of such a flywheel necessarily form two separate parts.
- the manufacturing cost and the assembly time of the parts of such a flywheel are important.
- the damping member comprises an outer portion of which a single face bears against and cooperates by friction with the annular inertial mass of the flywheel. The damping of the axial deflections of the flywheel is therefore limited.
- the present invention proposes a new flywheel whose axial movements are reduced.
- a flywheel of a torque transmission device of an engine comprising a hub and an annular inertial mass of larger diameter than the hub and secured to this hub, means of damping oscillations of the annular inertial mass with respect to this hub, comprising at least one damping member connecting the hub to the annular inertial mass and able to deform elastically in the direction of the axis of rotation of the flywheel, in which the damping member is formed in the form of an insert around which the flywheel is cast.
- the damping member rubs on the parts of the annular inertial mass of the flywheel with which it is in contact which reduces the axial movements of the flywheel annular mass of the flywheel. Thanks to the damping member adapted to deform elastically, the flywheel retains the flexibility provided by its bending capabilities. Thus the large amplitudes of the axial movements of the inertial mass are decreased, without significantly impacting the flexing capabilities of the entire flywheel. In addition, such a damping member does not require any means of attachment. Finally the size of the transmission device is reduced because the damping member is integrated in the flywheel.
- the damping member extends radially and has a central portion inserted into the thickness of the hub and an outer portion inserted into the annular inertial mass;
- the central portion of the damping member is integral with the hub and the outer portion of the damping member is movable radially relative to the annular inertial mass;
- the central part of the damping member is of annular shape and the damping member comprises two tabs which extend radially from the central part and whose end portion constitutes the outer part of the damping member ;
- each tongue is disposed along a preferred axis of bending of the flywheel;
- the annular inertial mass is provided with recessed sleeves adapted to receive the outer portion of the damping member
- the surface state of the end portions of the tongues is adapted to promote contact between said end portions and the annular inertial mass
- the flywheel comprising a plurality of inserts according to one of the preceding claims, axially spaced so that during the casting of the flywheel of the material envelops each of the inserts individually;
- the damping member is a plate
- Figure 1 is a side view of a flywheel and a crankshaft
- FIG. 2A is a sectional view in the median plane of the flywheel according to a first embodiment
- - Figure 2B is an axial sectional view of the flywheel of Figure 2A;
- - Figure 3A is a sectional view in the median plane of the flywheel according to a second embodiment;
- FIG. 3B is an axial sectional view of the flywheel of Figure 3A;
- FIG. 4A is a sectional view in the median plane of the flywheel according to a third embodiment
- FIG. 4B is an axial sectional view of the flywheel of Figure 4A;
- FIG. 5A is a sectional view in the median plane of the flywheel according to a fourth embodiment
- - Figure 5B is an axial sectional view of the flywheel of Figure 5A;
- - Figure 6A is a sectional view in the median plane of the flywheel according to a fifth embodiment;
- FIG. 6B is an axial sectional view of the flywheel of Figure 6A.
- FIG. 1 there is shown a portion of a torque transmission device of an internal combustion engine of a motor vehicle.
- This torque transmission device comprises a driving shaft, here a crankshaft 10 provided with a plate 1 1 attachment, and a flywheel 20 for cooperating with a clutch disc (not shown).
- the flywheel 20 comprises, on the one hand, a hub 22 adapted to be fixed to the plate 1 1 of the crankshaft 10 and, on the other hand, an annular inertial mass 21 which, moreover large diameter that the hub 22, is integral with the hub 22.
- the inertial mass 21 has a rear radial face oriented on the side of the crankshaft 10 and an opposite front radial face intended to cooperate by friction with the clutch disc (not shown).
- the hub 10 is the central portion of the flywheel 20.
- the flywheel 20 has openings, or through windows 23, 24, 25, 26 formed in the hub or central portion of the flywheel.
- the two through windows 25, 26 are diametrically opposed and symmetrical to one another relative to the axis X perpendicular to the plane of symmetry of the crankshaft 10 which allows to have flexibility around this axis X.
- the two through windows 23, 24 are diametrically opposed and symmetrical to each other with respect to the Y axis, that is to say the axis defined by the intersection of the average plane of the flywheel 20 and the plane of symmetry of the crankshaft 10 which allows to have flexibility around this axis.
- the levels of flexibility around the two preferred axes X and Y can be adjusted by acting on the size and shape of the through windows.
- the positions of these preferred axes with respect to each other and with respect to the plane of the crankshaft can be adjusted in order to decouple the bending modes around each of these two axes, that is to say in order to position , in the frequency range, the bending mode of the wheel around the X axis far enough from the bending mode around the Y axis not to increase the vibration of the crankshaft.
- the flywheel also comprises means for damping oscillations of the annular inertial mass 21 with respect to the hub 22.
- damping means comprise a damping member 30 connecting the hub 22 to the annular inertial mass 21 and capable of elastically deform in the direction of the axis of the crankshaft 10 coincides with the A1 axis of rotation of the flywheel.
- the damping member 30 is made in the form of an insert around which the flywheel 20 is cast.
- the damping member 30 extends in a plane transverse to the axis A1 and has a central portion 33 inserted into the thickness of the hub 22 and an outer portion 312, 322 inserted into the inertial mass 21 annular.
- the central portion 33 of the damping member 30 is integral with the hub 22 and the outer portion 312, 322 of the damping member 30 is movable radially with respect to the annular inertial mass 21, by sliding accompanied by a energy dissipation by friction, when the flywheel vibrates in flexion.
- the damping member is a flexible plate 30 made of a material, for example steel, sufficiently elastic to be able to deform under the effect of the deflections of the inertial mass and sufficiently strong mechanically to be able to hold under the effect of the alternating stresses imposed by the inertial mass in flexion.
- the plate is in one piece and is obtained by stamping then cutting (or punching).
- the plate has a small thickness, for example between 1.5 mm and 3 mm.
- the flexible plate 30 comprises tongues 31, 32 which extend radially from the central portion 33 and whose end portion constitutes the outer portion 312, 322 of the damping device.
- the central portion 33 is here in the form of a ring and interconnects the two tabs.
- These tongues 31, 32 also include an intermediate portion 31 1, 321.
- the hub 22 of the flywheel 20 has holes 27 for the passage of fastening screws 12.
- the central portion 33 of the plate is disposed between the orifices 27 and the through windows 23, 24, 25, 26 formed in the hub 22.
- each tab is disposed along a preferred bending axis of the flywheel 20, here the Y axis.
- the surfaces of the end portions of the tabs and portions of the annular inertial mass intended to be in contact can be adapted to promote friction between said parts by sliding by means of a suitable machining process and / or by removal of a specific coating.
- the mounting of the transmission device is carried out as follows.
- the flexible plate 30 composed of the ring 33 and the tongues 31, 32 is firstly produced. If necessary, it is possible to treat the surfaces of the end portions of the tongues in contact with the annular mass in order to allow relative mobility between the tongues and the annular mass.
- the plate is placed in a flywheel mold with a support for positioning the plate in the mold.
- molding of the flywheel is performed by overmolding the hub around the ring and overmolding the annular mass around the tongues.
- the flywheel 20 comprises a second damping insert 40 axially spaced from the first damping insert 30 so that, during the casting of the flywheel 20, the material wraps each of the inserts 30 and 40 individually.
- the plates 30, 40 are not contiguous to each other but are in contact on each of their face with the inertial mass to increase the friction surfaces of the inertial mass 21 on the plates during bending oscillations of the flywheel 20.
- FIGS. 5A and 5B which is a variant of the first embodiment (FIGS. 2A and 2B)
- a plate 60 provided with tongues 61, 62 whose external parts 63, 64 are expanded.
- the contact surfaces between the tongues and the annular inertial mass are increased.
- the annular inertial mass is also possible for the annular inertial mass to be provided with recessed sleeves 71, 72 adapted to receive the outer portion of the damping member 30 in order to improve the endurance behavior of the interfaces between the steel tongues and the cast ring mass.
- the sleeves are integral with the annular mass and the tongues slide in the sleeves.
- the sleeves are assembled on the tongues with a certain level of prestress so that the tongues always remain in contact with the sleeves while being able to slide when there is a movement relative between the annular mass and the hub of the steering wheel. Then, the flywheel is overmolded around the sleeves and the damping member.
- the plate has the shape of a washer, that is to say a hollow disc at the passage of the crankshaft and fixing screws to be in contact with the hub and the mass annular inertia of the flywheel throughout their radial extent.
- FIGS. 4A and 4B which is a variant of the first embodiment (FIGS. 2A and 2B)
- the damping member is in this embodiment consists of two parts each comprising a tongue 53, 57 whose end near the hub 22 is extended by a base 54, 56 widened, here rectangular, inserted into the hub 22.
- the two bases 54, 56 rectangular are distinct and constitute the central part of the damping device.
- flywheel is perforated.
- damping member as described above with a solid flywheel.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Operated Clutches (AREA)
- Pulleys (AREA)
Abstract
The invention relates to a flywheel (20) of a torque transmission device of an engine, comprising a hub (22) and an annular inertial mass (21) which has a larger diameter than the hub and is fixed thereto, and means for damping oscillations of the annular inertial mass in relation to said hub. The inventive flywheel comprises at least one damping element (30) which connects the hub to the annular inertial mass and can elastically deform itself according to the direction of the rotational axis of the flywheel. According to the invention, the damping element is embodied as an insert around which the flywheel is cast.
Description
VOLANT MOTEUR COMPORTANT DES MOYENS D'AMORTISSEMENT DES FLYWHEEL COMPRISING DAMPING MEANS
OSCILLATIONS DUDIT VOLANT MOTEUR DOMAINE TECHNIQUE AUQUEL SE RAPPORTE L'INVENTION La présente invention concerne de manière générale les volants moteur. Elle concerne plus particulièrement un volant moteur d'un dispositif de transmission de couple d'un moteur qui comprend un moyeu et une masse inertielle annulaire de plus grand diamètre que le moyeu et solidaire de ce moyeu, et des moyens d'amortissement des oscillations de la masse inertielle annulaire par rapport à ce moyeu, comportant au moins un organe d'amortissement reliant le moyeu à la masse inertielle annulaire et apte à se déformer élastiquement suivant la direction de l'axe de rotation du volant moteur.This invention relates generally to engine flywheels. BACKGROUND OF THE INVENTION It relates more particularly to a flywheel of a torque transmission device of an engine which comprises a hub and an annular inertial mass of larger diameter than the hub and integral with this hub, and damping means oscillations of the annular inertial mass with respect to this hub, comprising at least one damping member connecting the hub to the annular inertial mass and able to deform elastically in the direction of the axis of rotation of the flywheel.
L'invention trouve une application particulièrement avantageuse pour les volants moteurs de type flexible.The invention finds a particularly advantageous application for flexible type flywheels.
ARRIERE-PLAN TECHNOLOGIQUE Pour réduire les vibrations du moteur dans le domaine de moyennes fréquences (200-1000 Hz), on utilise généralement un volant moteur dit assoupli.BACKGROUND ART To reduce the motor vibrations in the medium frequency range (200-1000 Hz), a so-called relaxed flywheel is generally used.
Pour assouplir le volant moteur il est connu de réaliser des fenêtres traversantes diamétralement opposées sur le disque ce qui permet d'avoir une flexibilité autour d'un ou de plusieurs axes privilégiés appartenant au plan moyen du volant moteur, c'est-à-dire dans le plan transversal à l'axe de l'arbre menant.To soften the flywheel it is known to make diametrically opposite through windows on the disk which allows to have flexibility around one or more preferred axes belonging to the middle plane of the flywheel, that is to say in the plane transverse to the axis of the driving shaft.
Cependant, lorsque le moteur est en fonctionnement, la souplesse du volant moteur peut provoquer, par flexion de la masse inertielle, des débattements du volant moteur dans la direction axiale de l'arbre menant qui dépassent la limite tolérable. Il en résulte des problèmes de tenue mécanique du volant moteur et du disque d'embrayage qui coopère avec le volant moteur.However, when the engine is running, the flexibility of the flywheel can cause, by bending of the inertial mass, deflections of the flywheel in the axial direction of the drive shaft which exceed the tolerable limit. This results in mechanical strength problems of the flywheel and the clutch disc that cooperates with the flywheel.
Il est donc nécessaire pour ce type de volant moteur de trouver un moyen d'amortissement qui permet de réduire les débattements axiaux du volant moteur sans avoir toutefois un impact significatif sur sa souplesse en flexion.It is therefore necessary for this type of flywheel to find a damping means that reduces the axial deflections of the flywheel without having a significant impact on its flexibility in flexion.
Le document WO 2004/065807 décrit, dans son mode de réalisation illustré par la figure 13, un volant moteur qui comprend un moyeu et une masse inertielle annulaire fixée au moyeu. Il est aussi prévu un organe d'amortissement des oscillations de la masse inertielle annulaire par rapport à ce moyeu, apte à se déformer élastiquement suivant la direction de l'axe de rotation du volant.Document WO 2004/065807 describes, in its embodiment illustrated in FIG. 13, a flywheel which comprises a hub and an annular inertial mass fixed to the hub. There is also provided a damping member oscillations of the annular inertial mass with respect to this hub, able to deform elastically in the direction of the axis of rotation of the steering wheel.
Toutefois, dans ce mode de réalisation, l'organe d'amortissement est rapporté avec un système de fixation sur le moyeu et est situé entre le moyeu et la masse inertielle du volant moteur. L'organe d'amortissement est donc monté dans
le volant moteur lors de l'assemblage du moyeu et de la masse inertielle du volant moteur. La masse inertielle et le moyeu d'un tel volant moteur forment nécessairement deux pièces distinctes. Il en résulte que le coût de fabrication et le temps de montage des pièces d'un tel volant moteur sont importants. Au surplus, dans ce dispositif, l'organe d'amortissement comporte une partie extérieure dont une seule face prend appui contre et coopère par friction avec la masse inertielle annulaire du volant moteur. L'amortissement des débattements axiaux du volant moteur est donc limité.However, in this embodiment, the damping member is attached with a fastening system on the hub and is located between the hub and the inertial mass of the flywheel. The damping device is mounted in the flywheel during the assembly of the hub and the flywheel flywheel mass. The inertial mass and the hub of such a flywheel necessarily form two separate parts. As a result, the manufacturing cost and the assembly time of the parts of such a flywheel are important. Moreover, in this device, the damping member comprises an outer portion of which a single face bears against and cooperates by friction with the annular inertial mass of the flywheel. The damping of the axial deflections of the flywheel is therefore limited.
OBJET DE L'INVENTION La présente invention propose un nouveau volant moteur dont les débattements axiaux sont réduits.OBJECT OF THE INVENTION The present invention proposes a new flywheel whose axial movements are reduced.
À cet effet, on propose selon l'invention un volant moteur d'un dispositif de transmission de couple d'un moteur comprenant un moyeu et une masse inertielle annulaire de plus grand diamètre que le moyeu et solidaire de ce moyeu, des moyens d'amortissement des oscillations de la masse inertielle annulaire par rapport à ce moyeu, comportant au moins un organe d'amortissement reliant le moyeu à la masse inertielle annulaire et apte à se déformer élastiquement suivant la direction de l'axe de rotation du volant moteur, dans lequel l'organe d'amortissement est réalisé sous la forme d'un insert autour duquel le volant moteur est coulé.For this purpose, it proposes according to the invention a flywheel of a torque transmission device of an engine comprising a hub and an annular inertial mass of larger diameter than the hub and secured to this hub, means of damping oscillations of the annular inertial mass with respect to this hub, comprising at least one damping member connecting the hub to the annular inertial mass and able to deform elastically in the direction of the axis of rotation of the flywheel, in which the damping member is formed in the form of an insert around which the flywheel is cast.
Lors de la flexion du volant moteur, l'organe d'amortissement frotte sur les parties de la masse inertielle annulaire du volant moteur avec lesquelles il est en contact ce qui réduit les débattements axiaux de la masse inertielle annulaire du volant moteur. Grâce à l'organe d'amortissement apte à se déformer élastiquement, le volant moteur conserve la souplesse que lui procurent ses capacités de flexion. Ainsi les amplitudes importantes des débattements axiaux de la masse inertielle sont diminuées, sans impacter de façon significative les capacités de flexion de l'ensemble du volant moteur. Au surplus, un tel organe d'amortissement ne nécessite aucun moyen de fixation. Enfin l'encombrement du dispositif de transmission est réduit du fait que l'organe d'amortissement est intégré dans le volant moteur.During the bending of the flywheel, the damping member rubs on the parts of the annular inertial mass of the flywheel with which it is in contact which reduces the axial movements of the flywheel annular mass of the flywheel. Thanks to the damping member adapted to deform elastically, the flywheel retains the flexibility provided by its bending capabilities. Thus the large amplitudes of the axial movements of the inertial mass are decreased, without significantly impacting the flexing capabilities of the entire flywheel. In addition, such a damping member does not require any means of attachment. Finally the size of the transmission device is reduced because the damping member is integrated in the flywheel.
D'autres caractéristiques avantageuses et non limitatives du volant moteur selon l'invention sont les suivantes :
- l'organe d'amortissement s'étend radialement et présente une partie centrale insérée dans l'épaisseur du moyeu et une partie extérieure insérée dans la masse inertielle annulaire ;Other advantageous and non-limiting features of the flywheel according to the invention are the following: - The damping member extends radially and has a central portion inserted into the thickness of the hub and an outer portion inserted into the annular inertial mass;
- la partie centrale de l'organe d'amortissement est solidaire du moyeu et la partie extérieure de l'organe d'amortissement est mobile radialement par rapport à la masse inertielle annulaire ;- The central portion of the damping member is integral with the hub and the outer portion of the damping member is movable radially relative to the annular inertial mass;
- la partie centrale de l'organe d'amortissement est de forme annulaire et l'organe d'amortissement comprend deux languettes qui s'étendent radialement depuis la partie centrale et dont la partie terminale constitue la partie extérieure de l'organe d'amortissement ;the central part of the damping member is of annular shape and the damping member comprises two tabs which extend radially from the central part and whose end portion constitutes the outer part of the damping member ;
- le volant moteur présentant au moins un axe privilégié de flexion, chaque languette est disposée le long d'un axe privilégié de flexion du volant moteur ;- The flywheel having at least one preferred axis of bending, each tongue is disposed along a preferred axis of bending of the flywheel;
- la partie extérieure des languettes est élargie ;the outer part of the tongues is enlarged;
- la masse inertielle annulaire est pourvue de fourreaux encastrés adaptés à recevoir la partie extérieure de l'organe d'amortissement ;- The annular inertial mass is provided with recessed sleeves adapted to receive the outer portion of the damping member;
- l'état de surface des parties terminales des languettes est adapté pour favoriser le contact entre lesdites parties terminales et la masse inertielle annulaire ;- The surface state of the end portions of the tongues is adapted to promote contact between said end portions and the annular inertial mass;
- Le volant moteur comprenant une pluralité d'inserts selon l'une des revendications précédentes, axialement espacés de sorte que lors de la coulée du volant moteur de la matière enveloppe chacun des inserts individuellement ;- The flywheel comprising a plurality of inserts according to one of the preceding claims, axially spaced so that during the casting of the flywheel of the material envelops each of the inserts individually;
- l'organe d'amortissement est une plaque ;the damping member is a plate;
- la plaque est une rondelle. DESCRIPTION DÉTAILLÉE D'UN EXEMPLE DE RÉALISATION- the plate is a washer. DETAILED DESCRIPTION OF AN EXEMPLARY EMBODIMENT
La description qui va suivre en regard des dessins annexés de plusieurs modes de réalisation, donnés à titre d'exemples non limitatifs, fera bien comprendre en quoi consiste l'invention et comment elle peut être réalisée.The following description with reference to the accompanying drawings of several embodiments, given by way of non-limiting examples, will make it clear what the invention consists of and how it can be achieved.
Sur les dessins annexés : - la figure 1 est une vue de côté d'un volant moteur et d'un vilebrequin ;In the accompanying drawings: - Figure 1 is a side view of a flywheel and a crankshaft;
- la figure 2A est une vue en coupe dans le plan médian du volant moteur selon un premier mode de réalisation ;- Figure 2A is a sectional view in the median plane of the flywheel according to a first embodiment;
- la figure 2B est une vue en coupe axiale du volant moteur de la figure 2A ;
- la figure 3A est une vue en coupe dans le plan médian du volant moteur selon un deuxième mode de réalisation ;- Figure 2B is an axial sectional view of the flywheel of Figure 2A; - Figure 3A is a sectional view in the median plane of the flywheel according to a second embodiment;
- la figure 3B est une vue en coupe axiale du volant moteur de la figure 3A ;- Figure 3B is an axial sectional view of the flywheel of Figure 3A;
- la figure 4A est une vue en coupe dans le plan médian du volant moteur selon un troisième mode de réalisation ;- Figure 4A is a sectional view in the median plane of the flywheel according to a third embodiment;
- la figure 4B est une vue en coupe axiale du volant moteur de la figure 4A ;- Figure 4B is an axial sectional view of the flywheel of Figure 4A;
- la figure 5A est une vue en coupe dans le plan médian du volant moteur selon un quatrième mode de réalisation ;- Figure 5A is a sectional view in the median plane of the flywheel according to a fourth embodiment;
- la figure 5B est une vue en coupe axiale du volant moteur de la figure 5A ; - la figure 6A est une vue en coupe dans le plan médian du volant moteur selon un cinquième mode de réalisation ;- Figure 5B is an axial sectional view of the flywheel of Figure 5A; - Figure 6A is a sectional view in the median plane of the flywheel according to a fifth embodiment;
- la figure 6B est une vue en coupe axiale du volant moteur de la figure 6A.- Figure 6B is an axial sectional view of the flywheel of Figure 6A.
En préliminaire, on notera que les éléments identiques ou similaires des différents modes de réalisation représentés sur les différentes figures seront, dans la mesure du possible, référencés par les mêmes signes de référence et ne seront pas décrits à chaque fois.As a preliminary, it will be noted that the identical or similar elements of the various embodiments represented in the different figures will, as far as possible, be referenced by the same reference signs and will not be described each time.
Sur la figure 1 , on a représenté une partie d'un dispositif de transmission de couple d'un moteur à combustion interne d'un véhicule automobile.In Figure 1, there is shown a portion of a torque transmission device of an internal combustion engine of a motor vehicle.
Ce dispositif de transmission de couple comprend un arbre menant, ici un vilebrequin 10 pourvu d'un plateau 1 1 de fixation, ainsi qu'un volant moteur 20 destiné à coopérer avec un disque d'embrayage (non représenté).This torque transmission device comprises a driving shaft, here a crankshaft 10 provided with a plate 1 1 attachment, and a flywheel 20 for cooperating with a clutch disc (not shown).
Comme représenté sur les figures 2A et 2B, le volant moteur 20 comporte, d'une part, un moyeu 22 adapté à être fixé au plateau 1 1 du vilebrequin 10 et, d'autre part, une masse inertielle 21 annulaire qui, de plus grand diamètre que le moyeu 22, est solidaire de ce moyeu 22.As represented in FIGS. 2A and 2B, the flywheel 20 comprises, on the one hand, a hub 22 adapted to be fixed to the plate 1 1 of the crankshaft 10 and, on the other hand, an annular inertial mass 21 which, moreover large diameter that the hub 22, is integral with the hub 22.
De même que le moyeu, la masse inertielle 21 présente une face radiale arrière orientée du côté du vilebrequin 10 et une face radiale avant opposée destinée à coopérer par friction avec le disque d'embrayage (non représenté).Like the hub, the inertial mass 21 has a rear radial face oriented on the side of the crankshaft 10 and an opposite front radial face intended to cooperate by friction with the clutch disc (not shown).
Le moyeu du 10 constitue la partie centrale du volant moteur 20. Ici le volant moteur 20 comporte des ouvertures, ou fenêtres traversantes 23, 24, 25, 26 pratiquées dans le moyeu, ou partie centrale, du volant moteur.The hub 10 is the central portion of the flywheel 20. Here the flywheel 20 has openings, or through windows 23, 24, 25, 26 formed in the hub or central portion of the flywheel.
Ici, les deux fenêtres traversantes 25, 26 sont diamétralement opposées et symétriques l'une de l'autre par rapport à l'axe X perpendiculaire au plan de symétrie du vilebrequin 10 ce qui permet d'avoir une flexibilité autour de cet axe X.
Similairement, les deux fenêtres traversantes 23, 24 sont diamétralement opposées et symétriques l'une de l'autre par rapport à l'axe Y, c'est-à-dire l'axe défini par l'intersection du plan moyen du volant moteur 20 et du plan de symétrie du vilebrequin 10 ce qui permet d'avoir une flexibilité autour de cet axe. Les niveaux de flexibilité autour des deux axes privilégiés X et Y peuvent être ajustés en agissant sur la dimension et la forme des fenêtres traversantes.Here, the two through windows 25, 26 are diametrically opposed and symmetrical to one another relative to the axis X perpendicular to the plane of symmetry of the crankshaft 10 which allows to have flexibility around this axis X. Similarly, the two through windows 23, 24 are diametrically opposed and symmetrical to each other with respect to the Y axis, that is to say the axis defined by the intersection of the average plane of the flywheel 20 and the plane of symmetry of the crankshaft 10 which allows to have flexibility around this axis. The levels of flexibility around the two preferred axes X and Y can be adjusted by acting on the size and shape of the through windows.
Les positions de ces axes privilégiés l'un par rapport à l'autre et par rapport au plan du vilebrequin peuvent être ajustés afin de découpler les modes de flexion autour de chacun de ces deux axes, c'est-à-dire afin de positionner, dans le domaine des fréquences, le mode de flexion du volant autour de l'axe X suffisamment loin du mode de flexion autour de l'axe Y pour ne pas augmenter les vibrations du vilebrequin.The positions of these preferred axes with respect to each other and with respect to the plane of the crankshaft can be adjusted in order to decouple the bending modes around each of these two axes, that is to say in order to position , in the frequency range, the bending mode of the wheel around the X axis far enough from the bending mode around the Y axis not to increase the vibration of the crankshaft.
Le volant moteur comporte également des moyens d'amortissement des oscillations de la masse inertielle 21 annulaire par rapport au moyeu 22. Ces moyens d'amortissement comportent un organe d'amortissement 30 reliant le moyeu 22 à la masse inertielle 21 annulaire et apte à se déformer élastiquement suivant la direction de l'axe du vilebrequin 10 confondu avec l'axe A1 de rotation du volant moteur.The flywheel also comprises means for damping oscillations of the annular inertial mass 21 with respect to the hub 22. These damping means comprise a damping member 30 connecting the hub 22 to the annular inertial mass 21 and capable of elastically deform in the direction of the axis of the crankshaft 10 coincides with the A1 axis of rotation of the flywheel.
Avantageusement, l'organe d'amortissement 30 est réalisé sous la forme d'un insert autour duquel le volant moteur 20 est coulé. L'organe d'amortissement 30 s'étend dans un plan transversal à l'axe A1 et présente une partie centrale 33 insérée dans l'épaisseur du moyeu 22 et une partie extérieure 312, 322 insérée dans la masse inertielle 21 annulaire. La partie centrale 33 de l'organe d'amortissement 30 est solidaire du moyeu 22 et la partie extérieure 312, 322 de l'organe d'amortissement 30 est mobile radialement par rapport à la masse inertielle 21 annulaire, par glissement accompagné d'une dissipation d'énergie par friction, lorsque le volant moteur vibre en flexion.Advantageously, the damping member 30 is made in the form of an insert around which the flywheel 20 is cast. The damping member 30 extends in a plane transverse to the axis A1 and has a central portion 33 inserted into the thickness of the hub 22 and an outer portion 312, 322 inserted into the inertial mass 21 annular. The central portion 33 of the damping member 30 is integral with the hub 22 and the outer portion 312, 322 of the damping member 30 is movable radially with respect to the annular inertial mass 21, by sliding accompanied by a energy dissipation by friction, when the flywheel vibrates in flexion.
Ici, l'organe d'amortissement est une plaque flexible 30 réalisée dans un matériau, de l'acier par exemple, suffisamment élastique pour pouvoir se déformer sous l'effet des débattements de la masse inertielle et suffisamment résistant mécaniquement pour pouvoir tenir sous l'effet des contraintes alternées imposées par la masse inertielle en flexion. La plaque est d'un seul tenant et est obtenue par emboutissage puis découpage (ou poinçonnement). La plaque présente une épaisseur faible, comprise par exemple entre 1 ,5 mm et 3 mm.
Selon un premier mode de réalisation de l'invention représenté sur les figures 2A et 2B, la plaque flexible 30 comprend des languettes 31 , 32 qui s'étendent radialement depuis la partie centrale 33 et dont la partie terminale constitue la partie extérieure 312, 322 de l'organe d'amortissement. La partie centrale 33 est ici en forme de couronne et relie entre elles les deux languettes. Ces languettes 31 , 32 comprennent également une partie intermédiaire 31 1 , 321 .Here, the damping member is a flexible plate 30 made of a material, for example steel, sufficiently elastic to be able to deform under the effect of the deflections of the inertial mass and sufficiently strong mechanically to be able to hold under the effect of the alternating stresses imposed by the inertial mass in flexion. The plate is in one piece and is obtained by stamping then cutting (or punching). The plate has a small thickness, for example between 1.5 mm and 3 mm. According to a first embodiment of the invention shown in Figures 2A and 2B, the flexible plate 30 comprises tongues 31, 32 which extend radially from the central portion 33 and whose end portion constitutes the outer portion 312, 322 of the damping device. The central portion 33 is here in the form of a ring and interconnects the two tabs. These tongues 31, 32 also include an intermediate portion 31 1, 321.
Le moyeu 22 du volant 20 comporte des orifices 27 pour le passage de vis de fixation 12. La partie centrale 33 de la plaque est disposée entre les orifices 27 et les fenêtres traversantes 23, 24, 25, 26 pratiquées dans le moyeu 22. Comme représenté sur la figure 2A, chaque languette est disposée le long d'un axe privilégié de flexion du volant moteur 20, ici l'axe Y. En variante, on pourrait aussi prévoir de disposer des languettes suivant l'axe X.The hub 22 of the flywheel 20 has holes 27 for the passage of fastening screws 12. The central portion 33 of the plate is disposed between the orifices 27 and the through windows 23, 24, 25, 26 formed in the hub 22. As shown in FIG. shown in Figure 2A, each tab is disposed along a preferred bending axis of the flywheel 20, here the Y axis. Alternatively, one could also provide tabs along the X axis.
Les surfaces des parties terminales des languettes et des parties de la masse inertielle annulaire destinées à être en contact peuvent être adaptées pour favoriser les frottements entre lesdites parties par glissement au moyen d'un processus d'usinage adéquat et/ou par dépose d'un revêtement spécifique.The surfaces of the end portions of the tabs and portions of the annular inertial mass intended to be in contact can be adapted to promote friction between said parts by sliding by means of a suitable machining process and / or by removal of a specific coating.
Le montage du dispositif de transmission est réalisé de la façon suivante.The mounting of the transmission device is carried out as follows.
On réalise tout d'abord la plaque flexible 30 composée de la couronne 33 et des languettes 31 , 32. Si nécessaire, on peut procéder au traitement des surfaces des parties terminales des languettes en contact avec la masse annulaire afin de permettre une mobilité relative entre les languettes et la masse annulaire.The flexible plate 30 composed of the ring 33 and the tongues 31, 32 is firstly produced. If necessary, it is possible to treat the surfaces of the end portions of the tongues in contact with the annular mass in order to allow relative mobility between the tongues and the annular mass.
Enfin, on pose la plaque dans un moule du volant moteur avec un support permettant de bien positionner la plaque dans le moule. Enfin, on réalise le moulage du volant moteur par surmoulage du moyeu autour de la couronne et par surmoulage de la masse annulaire autour des languettes.Finally, the plate is placed in a flywheel mold with a support for positioning the plate in the mold. Finally, molding of the flywheel is performed by overmolding the hub around the ring and overmolding the annular mass around the tongues.
Les parties terminales des languettes en acier sont en contact permanent avec la masse annulaire en fonte. En fonctionnement, lorsque le volant moteur 20 vibre en flexion autour de l'axe perpendiculaire au plan de symétrie du vilebrequin 10, la masse annulaire 21 bouge axialement par rapport à son moyeu 22 et tente de tirer les languettes 31 , 32 également dans le sens axial. De ce fait, un effort de cisaillement est créé entre les languettes 31 , 32 et la masse annulaire 21 . Au-delà d'une certaine limite, les parties terminales 312, 322 des languettes 31 , 32 glissent par rapport à la masse annulaire 21 et créent donc un frottement sur la masse annulaire. Chaque mouvement axial de la masse annulaire est
accompagné d'un frottement avec les surfaces avant et arrière des parties terminales 312, 322 des languettes 31 , 32. Ces frottements alternatifs permettent d'atténuer les mouvements de la masse annulaire dans le sens axial et donc réduit les débattements axiaux du volant moteur en flexion. Selon un deuxième mode de réalisation représenté sur les figures 3A etThe end portions of the steel tabs are in permanent contact with the cast iron annular mass. In operation, when the flywheel 20 vibrates in bending about the axis perpendicular to the plane of symmetry of the crankshaft 10, the annular mass 21 moves axially relative to its hub 22 and tries to pull the tongues 31, 32 also in the direction axial. As a result, a shear force is created between the tongues 31, 32 and the annular mass 21. Beyond a certain limit, the end portions 312, 322 of the tongues 31, 32 slide relative to the annular mass 21 and thus create a friction on the annular mass. Each axial movement of the annular mass is accompanied by a friction with the front and rear surfaces of the end portions 312, 322 of the tongues 31, 32. These alternating friction make it possible to attenuate the movements of the annular mass in the axial direction and thus reduce the axial deflections of the flywheel in bending. According to a second embodiment shown in FIGS.
3B, le volant moteur 20 comprend un deuxième d'insert d'amortissement 40 axialement espacé du premier insert d'amortissement 30 de sorte que, lors de la coulée du volant moteur 20, de la matière enveloppe chacun des inserts 30 et 40 individuellement. Les plaques 30, 40 ne sont pas accolées les unes aux autres mais sont en contact sur chacune de leur face avec la masse inertielle pour augmenter les surfaces de frottement de la masse inertielle 21 sur les plaques lors des oscillations de flexion du volant moteur 20.3B, the flywheel 20 comprises a second damping insert 40 axially spaced from the first damping insert 30 so that, during the casting of the flywheel 20, the material wraps each of the inserts 30 and 40 individually. The plates 30, 40 are not contiguous to each other but are in contact on each of their face with the inertial mass to increase the friction surfaces of the inertial mass 21 on the plates during bending oscillations of the flywheel 20.
On peut aussi selon un troisième mode de réalisation représenté sur les figures 5A et 5B,qui est une variante du premier mode de réalisation (figures 2A et 2B), utiliser une plaque 60 pourvue de languettes 61 , 62 dont les parties extérieures 63, 64 sont élargies. Ainsi, les surfaces de contact entre les languettes et la masse inertielle annulaire sont augmentées.It is also possible, according to a third embodiment shown in FIGS. 5A and 5B, which is a variant of the first embodiment (FIGS. 2A and 2B), to use a plate 60 provided with tongues 61, 62 whose external parts 63, 64 are expanded. Thus, the contact surfaces between the tongues and the annular inertial mass are increased.
Selon un quatrième mode de réalisation représenté sur les figures 6A et 6B, on peut aussi prévoir que la masse inertielle annulaire soit pourvue de fourreaux 71 , 72 encastrés adaptés à recevoir la partie extérieure de l'organe d'amortissement 30 afin d'améliorer la tenue en endurance des interfaces entre les languettes en acier et la masse annulaire en fonte. Dans ce mode de réalisation, les fourreaux sont solidaires de la masse annulaire et les languettes glissent dans les fourreaux. Lors du procédé de fabrication du volant moteur selon ce mode de réalisation, on assemble les fourreaux sur les languettes avec un certain niveau de précontrainte afin que les languettes restent toujours en contact avec les fourreaux tout en pouvant glisser lorsque qu'il y a un mouvement relatif entre la masse annulaire et le moyeu du volant. Puis, le volant moteur est surmoulé autour des fourreaux et de l'organe d'amortissement.According to a fourth embodiment shown in FIGS. 6A and 6B, it is also possible for the annular inertial mass to be provided with recessed sleeves 71, 72 adapted to receive the outer portion of the damping member 30 in order to improve the endurance behavior of the interfaces between the steel tongues and the cast ring mass. In this embodiment, the sleeves are integral with the annular mass and the tongues slide in the sleeves. In the method of manufacturing the flywheel according to this embodiment, the sleeves are assembled on the tongues with a certain level of prestress so that the tongues always remain in contact with the sleeves while being able to slide when there is a movement relative between the annular mass and the hub of the steering wheel. Then, the flywheel is overmolded around the sleeves and the damping member.
En variante, on peut prévoir que la plaque ait la forme d'une rondelle, c'est-à-dire d'un disque évidé au niveau du passage du vilebrequin et des vis de fixations pour être en contact avec le moyeu et la masse inertielle annulaire du volant moteur sur toute leur étendue radiale.
Selon un cinquième mode de réalisation représenté sur les figures 4A et 4B, qui est une variante du premier mode de réalisation (figures 2A et 2B), on peut utiliser une plaque en deux parties 51 , 52. L'organe d'amortissement est dans ce mode de réalisation constitué de deux pièces qui comprennent chacune une languette 53, 57 dont l'extrémité proche du moyeu 22 est prolongée par une base 54, 56 élargie, ici rectangulaire, insérée dans le moyeu 22. Les deux bases 54, 56 rectangulaires sont distinctes et constituent la partie centrale de l'organe d'amortissement.Alternatively, it can be provided that the plate has the shape of a washer, that is to say a hollow disc at the passage of the crankshaft and fixing screws to be in contact with the hub and the mass annular inertia of the flywheel throughout their radial extent. According to a fifth embodiment shown in FIGS. 4A and 4B, which is a variant of the first embodiment (FIGS. 2A and 2B), it is possible to use a two-part plate 51, 52. The damping member is in this embodiment consists of two parts each comprising a tongue 53, 57 whose end near the hub 22 is extended by a base 54, 56 widened, here rectangular, inserted into the hub 22. The two bases 54, 56 rectangular are distinct and constitute the central part of the damping device.
La présente invention n'est nullement limitée aux modes de réalisation décrits et représentés, mais l'homme du métier saura y apporter toute variante conforme à son esprit.The present invention is not limited to the embodiments described and shown, but the skilled person will be able to make any variant within his mind.
Ici le volant moteur est ajouré. En variante, on peut prévoir d'utiliser l'organe d'amortissement tel que décrit ci-dessus avec un volant moteur plein.
Here the flywheel is perforated. Alternatively, it can be provided to use the damping member as described above with a solid flywheel.
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0513353A FR2895479B1 (en) | 2005-12-27 | 2005-12-27 | FLYWHEEL COMPRISING MEANS FOR DAMPING THE OSCILLATIONS OF SAID ENGINE FLYWHEEL |
PCT/FR2006/051296 WO2007074252A2 (en) | 2005-12-27 | 2006-12-06 | Flywheel comprising means for damping oscillations thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1966509A2 true EP1966509A2 (en) | 2008-09-10 |
Family
ID=36891676
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06842107A Withdrawn EP1966509A2 (en) | 2005-12-27 | 2006-12-06 | Flywheel comprising means for damping oscillations thereof |
Country Status (3)
Country | Link |
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EP (1) | EP1966509A2 (en) |
FR (1) | FR2895479B1 (en) |
WO (1) | WO2007074252A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2925638B1 (en) * | 2007-12-20 | 2012-12-21 | Renault Sas | INERTIA WHEEL FOR MOTOR VEHICLE WITH DAMPER GASKETS |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2725000B1 (en) * | 1994-09-26 | 1996-12-20 | Valeo | DOUBLE SHOCK ABSORBER |
FR2849683B1 (en) * | 2003-01-06 | 2006-07-28 | Valeo Embrayages | FLEXIBLE INERTILE WHEEL FOR TORQUE TRANSMISSION DEVICE |
FR2858674B1 (en) * | 2003-08-04 | 2007-06-29 | Valeo Embrayages | DOUBLE FLYWHEEL DAMPER WITH FLEXIBLE PRIMARY FLYWHEEL |
-
2005
- 2005-12-27 FR FR0513353A patent/FR2895479B1/en not_active Expired - Fee Related
-
2006
- 2006-12-06 EP EP06842107A patent/EP1966509A2/en not_active Withdrawn
- 2006-12-06 WO PCT/FR2006/051296 patent/WO2007074252A2/en active Application Filing
Non-Patent Citations (1)
Title |
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See references of WO2007074252A3 * |
Also Published As
Publication number | Publication date |
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WO2007074252A2 (en) | 2007-07-05 |
FR2895479B1 (en) | 2012-03-23 |
FR2895479A1 (en) | 2007-06-29 |
WO2007074252A3 (en) | 2007-08-16 |
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