FR3096613A1 - VEHICLE SUSPENSION BRAKE DEVICE INCLUDING INERTIAL FLUID COLUMNS - Google Patents
VEHICLE SUSPENSION BRAKE DEVICE INCLUDING INERTIAL FLUID COLUMNS Download PDFInfo
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- FR3096613A1 FR3096613A1 FR1905624A FR1905624A FR3096613A1 FR 3096613 A1 FR3096613 A1 FR 3096613A1 FR 1905624 A FR1905624 A FR 1905624A FR 1905624 A FR1905624 A FR 1905624A FR 3096613 A1 FR3096613 A1 FR 3096613A1
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- main
- circuit
- column
- braking device
- inertial
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G13/00—Resilient suspensions characterised by arrangement, location or type of vibration dampers
- B60G13/16—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dynamic absorbers as main damping means, i.e. spring-mass system vibrating out of phase
- B60G13/18—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dynamic absorbers as main damping means, i.e. spring-mass system vibrating out of phase combined with energy-absorbing means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G13/00—Resilient suspensions characterised by arrangement, location or type of vibration dampers
- B60G13/16—Resilient suspensions characterised by arrangement, location or type of vibration dampers having dynamic absorbers as main damping means, i.e. spring-mass system vibrating out of phase
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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
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
- F16F7/1034—Vibration-dampers; Shock-absorbers using inertia effect of movement of a liquid
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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
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/08—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid where gas is in a chamber with a flexible wall
- F16F9/096—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid where gas is in a chamber with a flexible wall comprising a hydropneumatic accumulator of the membrane type provided on the upper or the lower end of a damper or separately from or laterally on the damper
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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
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
- F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
- F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
- F16F9/18—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein
- F16F9/19—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein with a single cylinder and of single-tube type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
- B60G2202/20—Type of damper
- B60G2202/25—Dynamic damper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2500/00—Indexing codes relating to the regulated action or device
- B60G2500/10—Damping action or damper
- B60G2500/11—Damping valves
- B60G2500/116—Damping valves for damping pressure oscillations of the fluid in hydraulic lines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2600/00—Indexing codes relating to particular elements, systems or processes used on suspension systems or suspension control systems
- B60G2600/02—Retarders, delaying means, dead zones, threshold values, cut-off frequency, timer interruption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2600/00—Indexing codes relating to particular elements, systems or processes used on suspension systems or suspension control systems
- B60G2600/68—Filtering means, e.g. fluid filters
Abstract
DISPOSITIF DE FREINAGE DE SUSPENSION DE VEHICULE COMPRENANT DES COLONNES DE FLUIDE INERTIELLES Dispositif de freinage de suspension de véhicule automobile équipé de moyens de fixation en parallèle d’un ressort de suspension, comportant un vérin (6) comportant un piston (10) séparant deux chambres (12, 14) qui se déplace avec la suspension, comportant un circuit hydraulique principal (20) équipé d’une colonne de fluide inertielle principale (22) reliant les deux chambres (12, 14), et comportant un circuit hydraulique secondaire (30) indépendant du vérin (6), passant par la colonne inertielle principale (22), comprenant de chaque côté de cette colonne inertielle principale (22) un accumulateur de pression (36, 46) formant un ressort. Figure pour l’abrégé : Figure 2 VEHICLE SUSPENSION BRAKING DEVICE COMPRISING INERTIAL FLUID COLUMNS Motor vehicle suspension braking device equipped with means for attaching a suspension spring in parallel, comprising a cylinder (6) comprising a piston (10) separating two chambers (12, 14) which moves with the suspension, comprising a main hydraulic circuit (20) equipped with a main inertial fluid column (22) connecting the two chambers (12, 14), and comprising a secondary hydraulic circuit (30) independent of the cylinder (6), passing through the inertial column main (22), comprising on each side of this main inertial column (22) a pressure accumulator (36, 46) forming a spring. Figure for the abstract: Figure 2
Description
La présente invention concerne un dispositif de freinage hydraulique du mouvement de suspension de véhicule automobile, ainsi qu’un véhicule automobile équipé de tels dispositifs de freinage.The present invention relates to a device for hydraulically braking the suspension movement of a motor vehicle, as well as a motor vehicle equipped with such braking devices.
Les véhicules automobiles comportent sur chaque roue un amortisseur disposé en parallèle d’un ressort de suspension, qui amortit le mouvement de la suspension en le freinant afin d’assurer le confort, la tenue de caisse du véhicule et la tenue de route.Motor vehicles have a shock absorber on each wheel arranged in parallel with a suspension spring, which dampens the movement of the suspension by braking it in order to ensure comfort, vehicle body holding and road holding.
Le ressort, généralement métallique, permet de maintenir l’assiette statique ou quasi-statique du véhicule, en fonction de sa charge. Pour l’amortisseur, on utilise généralement des amortisseurs hydrauliques comprenant une tige liée à un piston se déplaçant dans un cylindre en délimitant deux chambres, avec une limitation des passages du fluide d’une chambre à l’autre afin de freiner les mouvements de cette tige.The spring, generally metallic, maintains the static or quasi-static attitude of the vehicle, depending on its load. For the shock absorber, hydraulic shock absorbers are generally used comprising a rod linked to a piston moving in a cylinder by delimiting two chambers, with a limitation of the passages of fluid from one chamber to the other in order to slow down the movements of this stem.
Toutefois afin d’améliorer le freinage de la suspension à certaines fréquences, en particulier aux fréquences propres de la caisse du véhicule, un dispositif de freinage à inertie connu, présenté notamment par le document FR-A1-3058678, comporte un vérin hydraulique entraîné par les mouvements de la suspension, comprenant deux chambres séparées par un piston, et reliées par une colonne de fluide formant une inertie additionnelle.However, in order to improve the braking of the suspension at certain frequencies, in particular at the natural frequencies of the vehicle body, a known inertia braking device, presented in particular by the document FR-A1-3058678, comprises a hydraulic cylinder driven by the movements of the suspension, comprising two chambers separated by a piston, and connected by a column of fluid forming an additional inertia.
On ajoute ainsi une inertie apparente de la caisse du véhicule permettant de descendre la fréquence propre d’oscillation de cette caisse sur ses suspensions, appelée mode de pompage, et aussi d’en limiter ses oscillations. De plus un dispositif commandé de modification de la longueur de la colonne de fluide permet suivant les besoins d’adapter l’inertie additionnelle.We thus add an apparent inertia of the body of the vehicle making it possible to lower the natural frequency of oscillation of this body on its suspensions, called pumping mode, and also to limit its oscillations. In addition, a controlled device for modifying the length of the fluid column makes it possible to adapt the additional inertia as needed.
Toutefois le dispositif commandé de ce système nécessite un moyen de commande de la suspension, pouvant comporter en particulier une liaison électrique, ce qui ajoute une complexité et des coûts.However, the controlled device of this system requires a means for controlling the suspension, which may include in particular an electrical connection, which adds complexity and costs.
La présente invention a notamment pour but d’éviter ces inconvénients de la technique antérieure.The object of the present invention is in particular to avoid these drawbacks of the prior art.
Elle propose à cet effet un dispositif de freinage de suspension de véhicule automobile équipé de moyens de fixation en parallèle d’un ressort de suspension, comportant un vérin comprenant un piston séparant deux chambres qui se déplace avec la suspension, et comportant un circuit hydraulique principal équipé d’une colonne de fluide inertielle principale reliant les deux chambres, ce dispositif étant remarquable en ce qu’il comporte un circuit hydraulique secondaire indépendant du vérin, passant par la colonne inertielle principale, comprenant de chaque côté de cette colonne inertielle principale un accumulateur de pression formant un ressort.It proposes for this purpose a motor vehicle suspension braking device equipped with means for fixing in parallel a suspension spring, comprising a jack comprising a piston separating two chambers which moves with the suspension, and comprising a main hydraulic circuit equipped with a main inertial fluid column connecting the two chambers, this device being remarkable in that it comprises a secondary hydraulic circuit independent of the cylinder, passing through the main inertial column, comprising on each side of this main inertial column an accumulator of pressure forming a spring.
Un avantage de ce dispositif de freinage est qu’on peut facilement régler les valeurs de l’inertie donnée par la colonne inertielle secondaire, et de la raideur des accumulateurs de pression, pour former une flexibilité hydraulique permettant d’introduire une fréquence de coupure calée sur celle du mode de pompage de la caisse du véhicule. On obtient de manière simple et économique, sans utiliser de commande extérieure, un dispositif de freinage qui répond aux différents impératifs de tenue de la caisse, et de filtrage des fréquences plus élevées, de rebond de la roue en particulier.An advantage of this braking device is that one can easily adjust the values of the inertia given by the secondary inertial column, and of the stiffness of the pressure accumulators, to form a hydraulic flexibility making it possible to introduce a fixed cut-off frequency on that of the vehicle body pumping mode. A braking device is obtained in a simple and economical manner, without using an external control, which meets the various requirements for holding the body, and for filtering the higher frequencies, wheel rebound in particular.
Le dispositif de freinage selon l’invention peut comporter, de plus, une ou plusieurs des caractéristiques suivantes qui peuvent être combinées entre elles.The braking device according to the invention may additionally comprise one or more of the following characteristics which may be combined with one another.
Avantageusement, le circuit principal comporte au moins un amortisseur principal formant une perte de charge disposée en série dans ce circuit.Advantageously, the main circuit comprises at least one main damper forming a pressure drop arranged in series in this circuit.
Avantageusement, l’ensemble composé des circuits secondaires comporte au moins une colonne de fluide inertielle secondaire disposée entre les deux accumulateurs de pression pour former un batteur.Advantageously, the assembly made up of the secondary circuits comprises at least one column of secondary inertial fluid placed between the two pressure accumulators to form a beater.
Dans ce cas, le circuit secondaire peut comporter une colonne inertielle secondaire disposée de chaque côté de la colonne inertielle principale.In this case, the secondary circuit may comprise a secondary inertial column arranged on each side of the main inertial column.
Avantageusement, le circuit secondaire comporte au moins un amortisseur secondaire formant une perte de charge disposée en série dans ce circuit.Advantageously, the secondary circuit comprises at least one secondary damper forming a pressure drop arranged in series in this circuit.
Dans ce cas, chaque accumulateur de pression peut comporter un amortisseur secondaire disposé à sa sortie.In this case, each pressure accumulator may include a secondary damper disposed at its outlet.
Avantageusement, le circuit secondaire comporte deux clapets de saturation disposés en opposition de sens l’un par rapport à l’autre, en parallèle de la colonne inertielle principale, ou comporte un amortisseur non-linéaire.Advantageously, the secondary circuit comprises two saturation valves arranged in opposite directions relative to each other, in parallel with the main inertial column, or comprises a non-linear damper.
L’invention a aussi pour objet un véhicule automobile équipé de suspensions, remarquable en ce qu’il comporte des suspensions comprenant un dispositif de freinage comprenant l’une quelconque des caractéristiques précédentes.The invention also relates to a motor vehicle equipped with suspensions, remarkable in that it comprises suspensions comprising a braking device comprising any one of the preceding characteristics.
Avantageusement, le circuit hydraulique secondaire présente une fréquence de coupure du circuit hydraulique principal qui est supérieure à la fréquence de 2,5 Hz.Advantageously, the secondary hydraulic circuit has a cut-off frequency of the main hydraulic circuit which is higher than the frequency of 2.5 Hz.
Avantageusement, le circuit secondaire comportant deux clapets de saturation disposés en opposition de sens l’un par rapport à l’autre, en parallèle de la colonne inertielle principale, présente un effet de coupure dynamique qui écrête les efforts au-dessus de la fréquence de 4 Hz.Advantageously, the secondary circuit comprising two saturation valves arranged in opposite directions with respect to each other, in parallel with the main inertial column, has a dynamic cut-off effect which clips the forces above the frequency of 4Hz.
L’invention sera mieux comprise et d’autres caractéristiques et avantages apparaîtront plus clairement à la lecture de la description ci-après donnée à titre d’exemple, en référence aux dessins annexés dans lesquels :The invention will be better understood and other characteristics and advantages will appear more clearly on reading the description below given by way of example, with reference to the appended drawings in which:
La figure 1 présente des simulations en fonction de la fréquence F exprimée en Hertz sur l’axe horizontal, du rapport d’accélération verticale de la caisse du véhicule en réponse à cette excitation, présenté sur l’axe vertical.Figure 1 presents simulations according to the frequency F expressed in Hertz on the horizontal axis, of the vertical acceleration ratio of the vehicle body in response to this excitation, presented on the vertical axis.
La première courbe 60 correspond à un premier véhicule équipé d’un ressort métallique, et d’un amortisseur habituellement utilisé comprenant un niveau de freinage constant sur toute sa course.The first curve 60 corresponds to a first vehicle equipped with a metal spring, and a normally used shock absorber comprising a constant level of braking over its entire travel.
Pour illustration, on obtient un rapport d’accélération verticale moyen pour les basses fréquences juste au-dessus de 1,5Hz, correspondant à la fréquence propre d’oscillation verticale de la caisse du véhicule posée sur sa suspension, assurant la tenue de la caisse sur tous types de route.For illustration, we obtain an average vertical acceleration ratio for low frequencies just above 1.5Hz, corresponding to the natural frequency of vertical oscillation of the vehicle body placed on its suspension, ensuring the body is held on all types of road.
Pour illustration, la deuxième courbe 62 correspond à un deuxième véhicule équipé d’un ressort métallique, et d’un amortisseur à faible niveau de freinage sur la partie centrale de sa courbe, comportant des butées hydrauliques de fin de course. On obtient un rapport d’accélération verticale élevé pour les basses fréquences autour de 1,5Hz, dépassant le rapport de 3, qui assure mal une tenue de la caisse du véhicule sur une route bosselée.For illustration, the second curve 62 corresponds to a second vehicle equipped with a metal spring, and a low-braking level shock absorber on the central part of its curve, comprising hydraulic limit stops. A high vertical acceleration ratio is obtained for the low frequencies around 1.5Hz, exceeding the ratio of 3, which does not ensure the vehicle body holds well on a bumpy road.
Pour illustration, la troisième courbe 64 correspond à un troisième véhicule équipé d’un vérin hydraulique entraîné par les mouvements de la suspension, comprenant deux chambres reliées par une colonne de fluide principale formant une inertie additionnelle, comme présenté par le document de l’art antérieur.For illustration, the third curve 64 corresponds to a third vehicle equipped with a hydraulic cylinder driven by the movements of the suspension, comprising two chambers connected by a main column of fluid forming an additional inertia, as presented by the document of the art prior.
Pour illustration, on obtient à partir de 1,3Hz un rapport d’accélération verticale réduit, inférieur à 2, qui est plus faible que pour le premier véhicule. En particulier pour une fréquence de 1,8 Hz on obtient un rapport d'environ 1.For illustration, we obtain from 1.3 Hz a reduced vertical acceleration ratio, less than 2, which is lower than for the first vehicle. In particular for a frequency of 1.8 Hz we obtain a ratio of approximately 1.
Toutefois on constate pour la troisième courbe 64 à partir d’une fréquence d’environ 3,5Hz, une augmentation du rapport d’accélération verticale qui atteint une valeur d’environ 0,7 à la fréquence de 7,6Hz.However, for the third curve 64, from a frequency of approximately 3.5 Hz, an increase in the vertical acceleration ratio is observed which reaches a value of approximately 0.7 at the frequency of 7.6 Hz.
La fréquence de rebond de la roue équipée de son pneumatique, qui est normalement pour le premier véhicule d’environ 15Hz, est diminuée pour ce troisième véhicule à cause de la colonne de fluide principale. Cette fréquence de rebond est située entre 5 et 10 Hz. Dans ce cas on transmet des vibrations au véhicule qui sont inconfortables.The rebound frequency of the wheel fitted with its tyre, which is normally around 15Hz for the first vehicle, is reduced for this third vehicle because of the main column of fluid. This rebound frequency is between 5 and 10 Hz. In this case, vibrations are transmitted to the vehicle which are uncomfortable.
La figure 2 présente un bras de suspension 2 relié à une roue du véhicule 4, subissant des accélérations verticales de roue qui sont transmises à une tige 8 d’un vérin hydraulique 6 fixé à la caisse du véhicule 28. En réponse au fonctionnement de la suspension du véhicule, la caisse 28 subit des accélérations verticales.FIG. 2 shows a suspension arm 2 connected to a wheel of the vehicle 4, undergoing vertical wheel accelerations which are transmitted to a rod 8 of a hydraulic cylinder 6 fixed to the body of the vehicle 28. In response to the operation of the suspension of the vehicle, the body 28 undergoes vertical accelerations.
Le vérin hydraulique 6 comporte un piston 10 séparant une première chambre supérieure 12 travaillant en compression lors de la montée de la roue 4, d’une deuxième chambre inférieure 14.The hydraulic cylinder 6 comprises a piston 10 separating a first upper chamber 12 working in compression when the wheel 4 rises, from a second lower chamber 14.
Selon le mode de réalisation présenté, un circuit inertiel principal 20 reliant les deux chambres du vérin 12, 14, comporte en série en partant de la première chambre 12 un premier amortisseur principal 24, une colonne hydraulique inertielle principale 22, et un deuxième amortisseur principal 26. Le débit du circuit inertiel principal 20 est directement lié au débattement relatif du piston 10 par rapport au corps du vérin 6.According to the embodiment presented, a main inertial circuit 20 connecting the two chambers of the actuator 12, 14, comprises in series, starting from the first chamber 12, a first main damper 24, a main inertial hydraulic column 22, and a second main damper 26. The flow rate of the main inertial circuit 20 is directly linked to the relative displacement of the piston 10 with respect to the body of the cylinder 6.
Les caractéristiques de la colonne inertielle principale 22 formée par un tube long et étroit, et des amortisseurs 24, 26 comprenant des restrictions de passage du fluide, sont calculées pour obtenir le meilleur compromis pour la tenue de caisse aux basses fréquences d’oscillations verticales de la caisse sur sa suspension, assurant le confort et la sécurité de tenue de route du véhicule.The characteristics of the main inertial column 22 formed by a long and narrow tube, and shock absorbers 24, 26 comprising fluid passage restrictions, are calculated to obtain the best compromise for body holding at low frequencies of vertical oscillations of the body on its suspension, ensuring the vehicle's road holding comfort and safety.
Une première partie de circuit inertiel secondaire 30 comporte en série en partant d’un point situé entre le premier amortisseur principal 24 et la colonne inertielle principale 22, un premier conduit inertiel secondaire 32, un premier amortisseur secondaire 34, puis un premier accumulateur hydraulique 36 comprenant un gaz inerte sous pression formant un ressort.A first secondary inertial circuit part 30 comprises in series starting from a point located between the first main damper 24 and the main inertial column 22, a first secondary inertial conduit 32, a first secondary damper 34, then a first hydraulic accumulator 36 comprising an inert gas under pressure forming a spring.
Une deuxième partie de circuit inertiel secondaire 30 comporte en série en partant d’un point situé entre la colonne inertielle principale 22 et le deuxième amortisseur principal 26, un deuxième conduit inertiel 42, un deuxième amortisseur secondaire 44, puis un deuxième accumulateur hydraulique 46 comprenant un gaz inerte sous pression formant un ressort.A second secondary inertial circuit part 30 comprises in series starting from a point located between the main inertial column 22 and the second main damper 26, a second inertial conduit 42, a second secondary damper 44, then a second hydraulic accumulator 46 comprising an inert gas under pressure forming a spring.
Deux clapets de saturation 50, 52 disposés en opposition de sens l’un par rapport à l’autre, en parallèle de la colonne inertielle principale 22, présentent un tarage permettant de limiter les pressions maximales aux extrémités de cette colonne, et donc les efforts sur la suspension lors des débattements à hautes fréquences.Two saturation valves 50, 52 arranged in opposite directions with respect to each other, in parallel with the main inertial column 22, have a calibration making it possible to limit the maximum pressures at the ends of this column, and therefore the forces on the suspension during high frequency travel.
Le circuit inertiel secondaire 30 avec ses deux parties, symétriques ou présentant des caractéristiques différentes l’une de l’autre, disposées chacune d’un côté du conduit inertiel principal 22, forment avec ce conduit principal un circuit indépendant des mouvements du piston 10 du vérin 6, avec un débit secondaire comprenant un transfert de fluide d’un accumulateur 36, à l’autre 46.The secondary inertial circuit 30 with its two parts, symmetrical or having different characteristics from each other, each arranged on one side of the main inertial duct 22, form with this main duct a circuit independent of the movements of the piston 10 of the cylinder 6, with a secondary flow comprising a transfer of fluid from one accumulator 36 to the other 46.
En particulier en calant la fréquence propre d’oscillation du débit secondaire proche de la fréquence propre d’oscillation verticale de la caisse du véhicule sur ses suspensions, soit environ 1,5Hz, on obtient l’effet donné par un batteur dynamique amplifiant la maîtrise de la surtension de pompage de la caisse.In particular, by setting the natural frequency of oscillation of the secondary flow close to the natural frequency of vertical oscillation of the body of the vehicle on its suspensions, i.e. approximately 1.5 Hz, the effect given by a dynamic drummer amplifying control is obtained. body pumping surge.
On calcule aussi les caractéristiques du circuit inertiel secondaire 30 pour obtenir une fréquence de coupure du circuit principal 20 supérieure à la fréquence propre de la caisse du véhicule, soit par exemple 2,5 Hz, en déviant le débit de cette moyenne fréquence vers les accumulateurs 36, 46 plutôt qu’à travers ce circuit principal.The characteristics of the secondary inertial circuit 30 are also calculated to obtain a cut-off frequency of the main circuit 20 greater than the natural frequency of the vehicle body, i.e. for example 2.5 Hz, by diverting the flow rate from this medium frequency to the accumulators. 36, 46 rather than through this main circuit.
Les amortisseurs secondaires 34, 44 permettent de maîtriser les effets dynamiques liés aux accumulateurs 36, 46, pour optimiser le compromis entre le filtrage des vibrations et la tenue de caisse.The secondary dampers 34, 44 make it possible to control the dynamic effects linked to the accumulators 36, 46, in order to optimize the compromise between the filtering of vibrations and the handling of the body.
D’autres composants ou fonctions hydrauliques peuvent être ajoutés sur le dispositif de freinage, comme notamment des trous de fuite, des saturateurs complémentaires ou des connexions entre les accumulateurs 36, 46. On peut notamment remplacer les clapets de saturation 50, 52 par des amortisseurs en adaptant la loi de pression par rapport au débit de manière optimale.Other hydraulic components or functions can be added to the braking device, such as in particular leakage holes, additional saturators or connections between the accumulators 36, 46. The saturation valves 50, 52 can in particular be replaced by shock absorbers by adapting the law of pressure in relation to the flow in an optimal manner.
La figure 3 présente une quatrième courbe 66 correspondant à un quatrième véhicule équipé de dispositifs de freinage selon l’invention. Dans cet exemple, on obtient pour les basses fréquences allant jusqu’à 1,9Hz, un rapport d’accélération verticale de la caisse du véhicule équivalent à celui de la première courbe 60 du premier véhicule équipé d’amortisseurs classiques. La tenue de la caisse sur tous types de routes est bien assurée, en particulier sur les routes bosselées.Figure 3 shows a fourth curve 66 corresponding to a fourth vehicle equipped with braking devices according to the invention. In this example, we obtain for low frequencies up to 1.9Hz, a vertical acceleration ratio of the body of the vehicle equivalent to that of the first curve 60 of the first vehicle equipped with conventional shock absorbers. The holding of the body on all types of roads is well assured, especially on bumpy roads.
On obtient pour les moyennes fréquences allant de 1,9Hz jusqu’à environ 6Hz, un rapport d’accélération verticale de la caisse sensiblement équivalent à celui de la deuxième courbe 62 du deuxième véhicule, présentant un très bon niveau de filtrage de la suspension.For the medium frequencies ranging from 1.9 Hz to about 6 Hz, a vertical acceleration ratio of the body is obtained substantially equivalent to that of the second curve 62 of the second vehicle, presenting a very good level of filtering of the suspension.
On obtient aussi à partir d’une fréquence d’environ 6Hz une très légère augmentation du rapport d’accélération dépassant celui de la première courbe 60, qui atteint environ 0,25 à la fréquence de 9Hz, puis décroît ensuite pour rejoindre la valeur de cette première courbe. On notera que cette augmentation est fortement réduite par rapport à celle de la troisième courbe 64 présentée figure 1, grâce à l’effet de coupure dynamique du circuit inertiel secondaire 30, et aux clapets de saturation 50, 52 qui écrêtent les efforts à haute fréquence pour les fortes amplitudes de débattement, notamment à partir de 6Hz.From a frequency of approximately 6Hz, a very slight increase in the acceleration ratio is also obtained, exceeding that of the first curve 60, which reaches approximately 0.25 at the frequency of 9Hz, then then decreases to reach the value of this first curve. It will be noted that this increase is greatly reduced compared to that of the third curve 64 presented in FIG. 1, thanks to the dynamic cut-off effect of the secondary inertial circuit 30, and to the saturation valves 50, 52 which clip the high-frequency forces. for high travel amplitudes, especially from 6Hz.
On assure ainsi de manière simple et efficace, avec un dispositif de freinage entièrement passif, ne comprenant pas de commande extérieure, présentant une simplicité et un coût réduit, une qualité de tenue de caisse du véhicule et de filtration des vibrations donnant suivant les fréquences sensiblement les meilleurs résultats pris parmi les différents types de systèmes de freinage connus présentés ci-dessus.This ensures in a simple and effective manner, with an entirely passive braking device, not comprising an external control, presenting simplicity and a reduced cost, a quality of vehicle body holding and vibration filtration giving, depending on the frequencies, substantially the best results taken from among the different types of known braking systems presented above.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1905624A FR3096613B1 (en) | 2019-05-28 | 2019-05-28 | VEHICLE SUSPENSION BRAKING DEVICE COMPRISING INERTIAL FLUID COLUMNS |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1905624A FR3096613B1 (en) | 2019-05-28 | 2019-05-28 | VEHICLE SUSPENSION BRAKING DEVICE COMPRISING INERTIAL FLUID COLUMNS |
| FR1905624 | 2019-05-28 |
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| Publication Number | Publication Date |
|---|---|
| FR3096613A1 true FR3096613A1 (en) | 2020-12-04 |
| FR3096613B1 FR3096613B1 (en) | 2022-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR1905624A Active FR3096613B1 (en) | 2019-05-28 | 2019-05-28 | VEHICLE SUSPENSION BRAKING DEVICE COMPRISING INERTIAL FLUID COLUMNS |
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| FR (1) | FR3096613B1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3118111A1 (en) * | 2020-12-17 | 2022-06-24 | Psa Automobiles Sa | UNSYMMETRIC HYDRAULIC INERTIAL SUSPENSION SYSTEM |
| FR3120016A1 (en) * | 2021-02-23 | 2022-08-26 | Psa Automobiles Sa | HYDRAULIC INERTIAL SUSPENSION DEVICE, METHOD, SHOCK ABSORBER AND VEHICLE BASED ON SUCH DEVICE |
| FR3120664A1 (en) * | 2021-03-09 | 2022-09-16 | Psa Automobiles Sa | HYDRAULIC INERTIAL SUSPENSION DEVICE, METHOD, SHOCK ABSORBER AND VEHICLE BASED ON SUCH DEVICE |
| FR3127795A1 (en) * | 2021-10-04 | 2023-04-07 | Psa Automobiles Sa | INERTIAL SUSPENSION DEVICE, AXLE SYSTEM AND VEHICLE BASED ON SUCH SYSTEM |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011100307A1 (en) * | 2011-05-03 | 2012-11-08 | Daimler Ag | Land bound passenger vehicle with a decoupling device and method for decoupling a body of the land-based passenger vehicle |
| US20130032442A1 (en) * | 2010-01-25 | 2013-02-07 | Lotus FI Team Limited | Fluid Inerter |
| FR3015371A1 (en) * | 2013-12-19 | 2015-06-26 | Peugeot Citroen Automobiles Sa | HYDROPNEUMATIC SUSPENSION FOR A MOTOR VEHICLE COMPRISING A DOUBLE-EFFECTED CYLINDER CONNECTED TO TWO PRESSURE ACCUMULATORS |
| FR3058678A1 (en) | 2016-11-17 | 2018-05-18 | Peugeot Citroen Automobiles Sa | VARIABLE FLUID INERTIA SUSPENSION DEVICE FOR A VEHICLE TRAIN |
-
2019
- 2019-05-28 FR FR1905624A patent/FR3096613B1/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130032442A1 (en) * | 2010-01-25 | 2013-02-07 | Lotus FI Team Limited | Fluid Inerter |
| DE102011100307A1 (en) * | 2011-05-03 | 2012-11-08 | Daimler Ag | Land bound passenger vehicle with a decoupling device and method for decoupling a body of the land-based passenger vehicle |
| FR3015371A1 (en) * | 2013-12-19 | 2015-06-26 | Peugeot Citroen Automobiles Sa | HYDROPNEUMATIC SUSPENSION FOR A MOTOR VEHICLE COMPRISING A DOUBLE-EFFECTED CYLINDER CONNECTED TO TWO PRESSURE ACCUMULATORS |
| FR3058678A1 (en) | 2016-11-17 | 2018-05-18 | Peugeot Citroen Automobiles Sa | VARIABLE FLUID INERTIA SUSPENSION DEVICE FOR A VEHICLE TRAIN |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3118111A1 (en) * | 2020-12-17 | 2022-06-24 | Psa Automobiles Sa | UNSYMMETRIC HYDRAULIC INERTIAL SUSPENSION SYSTEM |
| FR3120016A1 (en) * | 2021-02-23 | 2022-08-26 | Psa Automobiles Sa | HYDRAULIC INERTIAL SUSPENSION DEVICE, METHOD, SHOCK ABSORBER AND VEHICLE BASED ON SUCH DEVICE |
| FR3120664A1 (en) * | 2021-03-09 | 2022-09-16 | Psa Automobiles Sa | HYDRAULIC INERTIAL SUSPENSION DEVICE, METHOD, SHOCK ABSORBER AND VEHICLE BASED ON SUCH DEVICE |
| FR3127795A1 (en) * | 2021-10-04 | 2023-04-07 | Psa Automobiles Sa | INERTIAL SUSPENSION DEVICE, AXLE SYSTEM AND VEHICLE BASED ON SUCH SYSTEM |
| WO2023057696A1 (en) * | 2021-10-04 | 2023-04-13 | Psa Automobiles Sa | Inertial suspension device, axle system and vehicle based on such a system |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3096613B1 (en) | 2022-07-15 |
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