FR2734608A1 - Differential hydraulic circuit for feed and locking up of controlled double acting jack - Google Patents
Differential hydraulic circuit for feed and locking up of controlled double acting jack Download PDFInfo
- Publication number
- FR2734608A1 FR2734608A1 FR9508289A FR9508289A FR2734608A1 FR 2734608 A1 FR2734608 A1 FR 2734608A1 FR 9508289 A FR9508289 A FR 9508289A FR 9508289 A FR9508289 A FR 9508289A FR 2734608 A1 FR2734608 A1 FR 2734608A1
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- Prior art keywords
- cylinder
- chamber
- distributor
- differential
- jack
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
- B62D1/24—Steering controls, i.e. means for initiating a change of direction of the vehicle not vehicle-mounted
- B62D1/26—Steering controls, i.e. means for initiating a change of direction of the vehicle not vehicle-mounted mechanical, e.g. by a non-load-bearing guide
- B62D1/265—Steering controls, i.e. means for initiating a change of direction of the vehicle not vehicle-mounted mechanical, e.g. by a non-load-bearing guide especially adapted for guiding road vehicles carrying loads or passengers, e.g. in urban networks for public transportation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check valves
- F15B2211/3051—Cross-check valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
- F15B2211/3058—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve having additional valves for interconnecting the fluid chambers of a double-acting actuator, e.g. for regeneration mode or for floating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3105—Neutral or centre positions
- F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
- F15B2211/3127—Floating position connecting the working ports and the return line
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
- F15B2211/31576—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and a single output member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/625—Accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/75—Control of speed of the output member
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
Description
DISPOSITIF HYDRAULIOUE DIFFERENTIEL POUR
ALIMENTATION ET VERROUILLAGE DE VERINS DE
COMMANDE À DOUBLE EFFET.DIFFERENTIAL HYDRAULIC DEVICE FOR
FEEDING AND LOCKING OF CYLINDERS
DOUBLE ACTING CONTROL.
L'objet de l'invention se rapporte au secteur technique des organes de commande hydrauliques de levage et de manutention notamment. The object of the invention relates to the technical sector of hydraulic control devices for lifting and handling in particular.
Dans ces domaines techniques, il est souvent nécessaire de mettre en oeuvre des moyens hydrauliques importants pour commander rapidement les mouvements d'ensembles mécaniques à partir de vérins à double effet. In these technical fields, it is often necessary to use significant hydraulic means to quickly control the movements of mechanical assemblies from double-acting cylinders.
Dans la plupart des cas, un circuit classique convenablement calculé et comprenant une pompe hydraulique, un distributeur et des canalisations reliées aux deux extrémités du vérin de commande desdits ensembles, répond au problème posé. Mais dans certains cas, il peut y avoir des contraintes de poids, d'encombrement et surtout de temps de réponse très court pour faire passer un ensemble mécanique d'une position à une autre. In most cases, a conventional circuit suitably calculated and comprising a hydraulic pump, a distributor and pipes connected to the two ends of the control cylinder of said assemblies, responds to the problem posed. But in some cases, there may be constraints of weight, size and above all very short response time to move a mechanical assembly from one position to another.
C'est le cas notamment dans le concept de transport urbain combiné rail-route dans lequel le véhicule suivant son parcours est soit guidé sur un rail unique soit totalement libre sur la voie routière. This is particularly the case in the concept of combined urban rail-road transport in which the vehicle following its route is either guided on a single rail or completely free on the road.
Pour cela, le véhicule généralement composé de plusieurs voitures reliées entre elles par des plateformes tournantes et des soufflets, présente des essieux directeurs équipés et guidés individuellement sur le rail unique par un train de deux galets escamotables par vérins double effet pour passer de la position rail à la position route. For this, the vehicle generally composed of several cars connected together by rotating platforms and bellows, has steering axles equipped and individually guided on the single rail by a train of two retractable rollers by double-acting cylinders to pass from the rail position at the road position.
Pour passer d'une position à l'autre, en particulier de la position route à la position guidage sur un rail, le cahier des charges impose un temps de manoeuvre des galets en descente très court du fait que le véhicule doit enrayer, certes à vitesse lente (5 à 10 km/h) mais compte tenu des entraxes rapprochés des essieux, cela oblige à effectuer l'opération en 1 à 3 secondes. To pass from one position to another, in particular from the road position to the guide position on a rail, the specifications impose a very short downhill maneuvering time of the rollers because the vehicle must stop, certainly at slow speed (5 to 10 km / h) but taking into account the close centers of the axles, this requires the operation to be carried out in 1 to 3 seconds.
On comprend que pour obtenir ce bref temps de réponse, il est nécessaire de mettre en oeuvre des moyens hydrauliques très puissants, donc lourds, encombrants et onéreux. Or ce type de transports urbains est aux normes actuelles en matière d'accès, c'est à dire avec un plancher surbaissé autorisant la montée et la descente au niveau du quai pour les handicapés. De ce fait, I'espace plancher est trop restreint pour loger tous les mécanismes, en particulier les commandes hydrauliques, qu'il faut donc installer en toiture.Mais il est bien évident que l'implantation en toiture de tels équipements avec un circuit hydraulique classique (pompe, distributeur, vérins) pose des problèmes de stabilité du véhicule (centre de gravité trop haut), de renforcement de la caisse (poids important), d'intégration dans l'habillage de canalisations de gros diamètres pour relier les organes aux vérins de commande des trains de galets, de prix de revient par l'importance des équipements et les puissances exigées, ainsi que de pertes de charges et d'échauffement de fluides importants. It is understood that to obtain this short response time, it is necessary to use very powerful hydraulic means, therefore heavy, bulky and expensive. However, this type of urban transport is up to current standards in terms of access, that is to say with a lowered floor allowing the ascent and descent to the level of the platform for the disabled. As a result, the floor space is too limited to accommodate all the mechanisms, in particular the hydraulic controls, which must therefore be installed on the roof. But it is quite obvious that the installation on the roof of such equipment with a hydraulic circuit conventional (pump, distributor, cylinders) poses problems of vehicle stability (center of gravity too high), strengthening of the body (significant weight), integration in the covering of large diameter pipes to connect the organs to cylinders for controlling the train of rollers, cost price by the importance of the equipment and the powers required, as well as pressure losses and significant heating of fluids.
Pour résoudre le problème posé, d'opérer très rapidement la manoeuvre d'ensembles mécaniques à partir de vérins à double effet, sans pour cela mettre en oeuvre des moyens lourds, encombrants et onéreux, on a réalisé le dispositif hydraulique différentiel selon l'invention qui permet de diminuer de manière importante le temps de déplacement de la charge tout en réduisant la puissance nominale pour réaliser une opération identique s'il n'y avait pas le dispositif différentiel. To solve the problem posed, to operate very quickly the operation of mechanical assemblies from double-acting cylinders, without using heavy, bulky and expensive means, the differential hydraulic device according to the invention has been produced. which makes it possible to significantly reduce the load's travel time while reducing the nominal power to perform an identical operation if the differential device were not present.
Pour cela et selon une première caractéristique, dans le circuit hydraulique de commande du vérin à double effet, comprenant une centrale d'alimentation, un distributeur et des canalisations d'entrée et de sortie du vérin, est interposé un dispositif différentiel compact d'alimentation apte, lorsqu'il est actionné en vue de la sortie de la tige de vérin, à acheminer directement le fluide contenu dans la chambre du corps de vérin situé du côté de ladite tige, vers la chambre du corps de vérin formée à l'opposé du piston, sans revenir vers le distributeur et la centrale et en s'ajoutant ainsi au fluide entrant dans le vérin, cela sans apport complémentaire de puissance. For this and according to a first characteristic, in the hydraulic circuit for controlling the double-acting cylinder, comprising a supply unit, a distributor and inlet and outlet lines for the cylinder, a compact differential supply device is interposed. suitable, when actuated for the output of the cylinder rod, to directly convey the fluid contained in the chamber of the cylinder body located on the side of said rod, towards the chamber of the cylinder body formed opposite of the piston, without returning to the distributor and the central unit and thus adding to the fluid entering the cylinder, without additional power.
Pour résoudre le problème posé de loger aisément les équipements hydrauliques dans l'espace restreint du plancher surbaissé d'un véhicule de transport urbain, le dispositif différentiel compact selon l'invention est installé directement sur le corps du vérin de commande ou à proximité, tandis que la centrale d'alimentation et le distributeur sont fixés en toiture. To solve the problem of easily accommodating hydraulic equipment in the limited space of the lowered floor of an urban transport vehicle, the compact differential device according to the invention is installed directly on the body of the control cylinder or close to it, while that the power station and the distributor are fixed on the roof.
Pour résoudre le problème posé d'obstacles s'interposant entre les trains de galets et le rail, on prévoit de créer un aménagement complémentaire dudit dispositif différentiel afin d'une part de constituer un moyen de verrouillage économique des trains de galets en position haute, en lieu et place d'un moyen classique du type genouillère mécanique, et, d'autre part, de permettre auxdits trains de galets de conserver leur appui sur le rail, quels que soient les variations d'altitude de ce dernier, ou lorsque des obstacles s'interposent, cela avec toute la souplesse nécessaire à la fiabilité des mécanismes, c'est à dire en évitant les chocs répétés sur les vérins. To solve the problem of obstacles interposed between the roller trains and the rail, provision is made to create a complementary arrangement of said differential device in order on the one hand to constitute a means of economic locking of the roller trains in the high position, instead of a conventional means of the mechanical toggle type, and, on the other hand, to allow said train of rollers to retain their support on the rail, whatever the variations in altitude of the latter, or when obstacles are interposed, this with all the flexibility necessary for the reliability of the mechanisms, ie by avoiding repeated shocks on the jacks.
Pour cela et selon une autre caractéristique, le dispositif différentiel présente un clapet dans la partie de circuit hydraulique allant du distributeur de fluide au fond du vérin du côté opposé à la tige de piston, tandis que ladite partie du circuit et la canalisation différentielle portant l'organe de contrôle de pression communiquent avec un accumulateur de pression. For this and according to another characteristic, the differential device has a valve in the part of the hydraulic circuit going from the fluid distributor to the bottom of the jack on the side opposite to the piston rod, while said part of the circuit and the differential pipe carrying the The pressure control device communicates with a pressure accumulator.
Ces caractéristiques et d'autres encore ressortiront de la description qui suit
Pour fixer l'objet de l'invention sans toutefois le limiter dans les dessins annexés
- la figure 1 est un schéma illustrant le principe du dispositif selon l'invention.These characteristics and others will emerge from the description which follows
To fix the subject of the invention without however limiting it in the attached drawings
- Figure 1 is a diagram illustrating the principle of the device according to the invention.
- la figure 2 est un schéma illustrant une forme de réalisation du dispositif selon l'invention. - Figure 2 is a diagram illustrating an embodiment of the device according to the invention.
- la figure 3 est une vue à caractère schématique illustrant l'application du dispositif à un véhicule de transport urbain du type combiné rail-route, représenté en position guidage sur rail. - Figure 3 is a schematic view illustrating the application of the device to an urban transport vehicle of the combined rail-road type, shown in the guide position on rail.
- la figure 4 est une vue de côté à caractère schématique considérée suivant la ligne 4-4 de la figure 3, illustrant le véhicule en position de guidage sur rail. - Figure 4 is a schematic side view taken along line 4-4 of Figure 3, illustrating the vehicle in the guide position on the rail.
- la figure 5 est une vue en plan partielle à caractère schématique illustrant deux essieux consécutifs du véhicule selon la figure 3. FIG. 5 is a diagrammatic partial plan view illustrating two consecutive axles of the vehicle according to FIG. 3.
- La figure 6 est un schéma illustrant une réalisation du dispositif avec montage flottant des trains de galets
Afin de rendre plus concret l'objet de l'invention, on le décrit maintenant sous des formes non limitatives de réalisation illustrées aux figures des dessins.- Figure 6 is a diagram illustrating an embodiment of the device with floating mounting of the roller trains
In order to make the object of the invention more concrete, it is now described in nonlimiting embodiments illustrated in the figures of the drawings.
On a illustré à la figure 1 le principe général du dispositif selon l'invention intégré dans un circuit hydraulique classique, à savoir : une centrale hydraulique (1) alimentant un distributeur (2) relié à un vérin à double effet (3) par des canalisations d'entrée (4) et de sortie (5). Le vérin (3) est destiné à déplacer une charge (6) par sa tige (3a) dont le piston (3b) est soumis à l'action d'un fluide (flèche F1) en provenance du distributeur par la canalisation (4) et pénétrant dans la chambre (A) du corps de vérin. Le fluide contenu dans la chambre (B) du corps du vérin est alors repoussé dans la canalisation de sortie (5) pour normalement revenir au distributeur (2).Selon l'invention, on interpose sur cette canalisation un clapet anti-retour (7) et on fait passer le fluide (Flèche F2) dans une canalisation de dérivation (8) reliée à la canalisation d'entrée (4) et sur laquelle est disposé un moyen (9) autorisant le passage du fluide sous pression contrôlée dont le volume vient s'ajouter au fluide entrant dans la chambre (A), en augmentant ainsi la vitesse de sortie de la tige de vérin. Illustrated in Figure 1 the general principle of the device according to the invention integrated in a conventional hydraulic circuit, namely: a hydraulic unit (1) supplying a distributor (2) connected to a double-acting cylinder (3) by inlet (4) and outlet (5) pipes. The jack (3) is intended to move a load (6) by its rod (3a) whose piston (3b) is subjected to the action of a fluid (arrow F1) coming from the distributor by the pipe (4) and entering the chamber (A) of the cylinder body. The fluid contained in the chamber (B) of the cylinder body is then pushed back into the outlet pipe (5) to normally return to the distributor (2). According to the invention, a non-return valve (7) is interposed on this pipe. ) and the fluid is passed (arrow F2) in a bypass pipe (8) connected to the inlet pipe (4) and on which is disposed a means (9) allowing the passage of the fluid under controlled pressure whose volume is added to the fluid entering the chamber (A), thereby increasing the speed of exit of the cylinder rod.
Le moyen (9) peut être de tout type. On a illustré à la figure 2, un moyen représenté en traits interrompus comprenant une soupape (10) et un organe de pilotage (11). The means (9) can be of any type. Is illustrated in Figure 2, a means shown in broken lines comprising a valve (10) and a control member (11).
La soupape (10) est tarée à une valeur suffisante pour équilibrer la charge (6). De ce fait, lorsque le distributeur (2) est non actionné, cette charge est bloquée en position haute ou basse par l'action conjuguée du clapet anti-retour (7) et de la soupape de limitation de pression. The valve (10) is calibrated to a value sufficient to balance the load (6). Therefore, when the distributor (2) is not actuated, this load is blocked in the high or low position by the combined action of the non-return valve (7) and the pressure limiting valve.
En se référant à la figure 6 annexée, on décrit maintenant le fonctionnement du dispositif avec montage flottant des trains de galets. Referring to Figure 6 attached, we now describe the operation of the device with floating mounting of the roller trains.
Lorsque l'on veut actionner les vérins dans le sens d'une remontée de la charge (6), représentant les trains de galets, on ouvre le circuit de la bobine (2a) du distributeur pour alimenter sous pression la chambre (B) des vérins en passant à travers le clapet (7). La mise en pression permet le pilotage par la canalisation (32) d'un deuxième clapet (30) ajouté dans le circuit. Cette ouverture de clapet autorise la vidange d'un accumulateur (31) également ajouté dans le circuit, ainsi que celle du fluide contenu dans la chambre (A) du piston.En position haute, les vérins sont alors verrouillés par les clapets (7 et 30) et la soupape tarée (10) initialement prévue
A l'inverse, lorsque l'on veut actionner les vérins dans le sens d'une descente de la charge (6), on ouvre le circuit du côté de la bobine (2b) du distributeur pour alimenter sous pression la chambre (A) des vérins en passant à travers le clapet (30). La pression doit être suffisante pour piloter la soupape tarée (10), autorisant ainsi la descente du vérin en alimentation différentielle, c'est-à-dire avec passage direct du fluide expulsé de la chambre (B) par le dispositif différentiel.When we want to actuate the cylinders in the direction of a load rise (6), representing the roller trains, we open the coil circuit (2a) of the distributor to supply pressure to the chamber (B) of the cylinders passing through the valve (7). The pressurization allows the piloting by the pipe (32) of a second valve (30) added in the circuit. This valve opening allows the emptying of an accumulator (31) also added to the circuit, as well as that of the fluid contained in the chamber (A) of the piston. In the high position, the jacks are then locked by the valves (7 and 30) and the calibrated valve (10) initially provided
Conversely, when we want to actuate the cylinders in the direction of a descent of the load (6), we open the circuit on the side of the coil (2b) of the distributor to supply pressure to the chamber (A) cylinders passing through the valve (30). The pressure must be sufficient to drive the calibrated valve (10), thus authorizing the descent of the cylinder into differential supply, that is to say with direct passage of the fluid expelled from the chamber (B) by the differential device.
Lorsque les galets arrivent en appui sur leur rail un détecteur (non représenté) coupe l'alimentation de la bobine (2b) afin d'obtenir une pression dans l'accumulateur (31) suffisante pour ouvrir la soupape tarée (10) et mettre en communication les deux chambres des vérins, en permettant ainsi un flottement d'amplitude limitée aux trains de galets, leur autorisant un possible relevage au passage d'obstacles sur le rail avec un retour immédiat en contact et en pression, ou bien pour encaisser les variations d'altitude du rail.When the rollers come to bear on their rail, a detector (not shown) cuts the supply to the coil (2b) in order to obtain a pressure in the accumulator (31) sufficient to open the calibrated valve (10) and put in communication between the two chambers of the jacks, thus allowing floating of limited amplitude to the roller trains, allowing them to be lifted when obstacles pass over the rail with immediate return in contact and pressure, or to absorb variations rail altitude.
On a représenté aux figures 3, 4, et 5, un exemple d'application de ce dispositif à un véhicule de transport urbain du type rail-route. There is shown in Figures 3, 4, and 5, an example of application of this device to an urban transport vehicle of the rail-road type.
Dans cet exemple nullement limitatif, le véhicule (V) présente par exemple trois voitures (V1-V2-V3) reliées entre elle par des plateformes tournantes (T) et des soufflets (S). La voiture (V1) à l'avant présente deux essieux directeurs (E1-E2), tandis que les voitures intermédiaire et arrière (V2-V3) présentent chacune un essieu directeur (E3-E4). Ces essieux sont équipés de pneus (P) permettant au véhicule d'être déplacé en toute liberté sur les voies routières. In this in no way limiting example, the vehicle (V) presents for example three cars (V1-V2-V3) connected to each other by rotating platforms (T) and bellows (S). The car (V1) at the front has two steering axles (E1-E2), while the intermediate and rear cars (V2-V3) each have a steering axle (E3-E4). These axles are fitted with tires (P) allowing the vehicle to be moved freely on the roadways.
Axialement, sur chaque essieu du véhicule s'étendent de part et d'autre des galets (G) portés à rotation libre en bout de couples de bras-supports (B) articulés au corps d'essieu à leur extrémité opposée. Ces galets sont destinés à coopérer avec un rail unique (R) fixé sur les voies routières, lorsque cela est nécessaire. Axially, on each axle of the vehicle extend rollers (G) carried on free rotation at the end of pairs of support arms (B) articulated to the axle body at their opposite end. These rollers are intended to cooperate with a single rail (R) fixed on the roadways, when necessary.
Comme indiqué plus haut, le problème à résoudre est d'opérer le plus rapidement possible la descente de ces galets en fonction de la vitesse d'enrayement du véhicule et de l'entraxe rapproché des essieux. As indicated above, the problem to be solved is to operate the descent of these rollers as quickly as possible as a function of the vehicle speed and the close center distance of the axles.
Pour cela on dispose sur chaque bras-support (B) des trains de galets, un vérin à double effet (20), soit quatre vérins par essieu, et on relie ces vérins au circuit hydraulique conforme à l'invention, à savoir : des canalisations d'entrée (21) et de sortie (22) connectées par une canalisation dérivée (23) à un dispositif différentiel (24) destiné à ajouter le volume de fluide repoussé par le piston au volume entrant dans le vérin, lorsque l'on veut descendre le train de galets, cela grâce au clapet anti-retour (25) et aux organes de passage contrôlé du fluide, soupape (26) et pilotage (27). For this, a double-acting cylinder (20), or four cylinders per axle, is placed on each support arm (B) of roller trains, and these cylinders are connected to the hydraulic circuit according to the invention, namely: inlet (21) and outlet (22) pipes connected by a branch pipe (23) to a differential device (24) intended to add the volume of fluid repelled by the piston to the volume entering the cylinder, when one wants to lower the roller train, thanks to the non-return valve (25) and to the bodies for controlled passage of the fluid, valve (26) and piloting (27).
Comme on le voit, le dispositif différentiel peut parfaitement être installé sur le vérin ou à proximité immédiate, compte tenu de son faible encombrement, tandis que les distributeurs (28) au nombre de quatre (un par essieu) et la centrale hydraulique d'alimentation (29) peuvent être installés en toiture. Les canalisation de liaison (21-22) étant de faible diamètre, la centrale et les distributeurs étant des éléments compacts parce que exigeant peu de puissance, il n'y a pas de problèmes particuliers à les disposer en hauteur. As can be seen, the differential device can be perfectly installed on the cylinder or in the immediate vicinity, given its small size, while the distributors (28) four in number (one per axle) and the hydraulic supply unit (29) can be installed on the roof. The connecting pipes (21-22) being of small diameter, the power station and the distributors being compact elements because requiring little power, there are no particular problems to arrange them in height.
L'injection du fluide dérivé ajoutée au débit de la centrale autorise des vitesses de sortie ou descente des trains de galets conformes aux prescriptions, cela tout en réduisant la puissance nominale de l'installation. The injection of the derivative fluid added to the flow rate of the power plant allows exit or descent speeds of the roller trains in accordance with the requirements, while reducing the nominal power of the installation.
De plus, le circuit ainsi réalisé, on obtient en même temps un blocage dans toutes les positions entre le relevage complet et l'appui des trains de galets sur le rail. Dans cette position d'appui le verrouillage est supprimé et le train de galets devient flottant. Cette sécurité double vient en complément éventuel des moyens de verrouillage mécanique. In addition, the circuit thus produced, at the same time a blocking is obtained in all positions between the complete lifting and the support of the roller trains on the rail. In this support position, the locking is removed and the roller train becomes floating. This double security is a possible complement to the mechanical locking means.
Avec ce type de circuit hydraulique, on obtient une installation compacte avec réduction sensible des sections des canalisations pour des performances satisfaisantes et identiques à une installation de plus grande puissance. With this type of hydraulic circuit, a compact installation is obtained with appreciable reduction in the cross-section of the pipes for satisfactory performance and identical to a higher power installation.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9508289A FR2734608A1 (en) | 1995-05-24 | 1995-06-30 | Differential hydraulic circuit for feed and locking up of controlled double acting jack |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9506426A FR2734607A1 (en) | 1995-05-24 | 1995-05-24 | Differential hydraulic circuit for feed and locking up of controlled double acting jack |
FR9508289A FR2734608A1 (en) | 1995-05-24 | 1995-06-30 | Differential hydraulic circuit for feed and locking up of controlled double acting jack |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2734608A1 true FR2734608A1 (en) | 1996-11-29 |
Family
ID=26231998
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR9508289A Withdrawn FR2734608A1 (en) | 1995-05-24 | 1995-06-30 | Differential hydraulic circuit for feed and locking up of controlled double acting jack |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2734608A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001025087A1 (en) * | 1999-10-07 | 2001-04-12 | Honeywell Normalair-Garrett (Holdings) Limited | Hydraulic system for aircraft landing gear |
EP1518768A1 (en) * | 2003-09-24 | 2005-03-30 | Sörensen Hydraulik Zweigniederlassung, Ulfborg, Filial af Sörensen Hydraulik GmbH, Tyskland | Device for supporting platforms |
WO2002006679A3 (en) * | 2000-07-05 | 2007-10-25 | Raymond Company | Regeneration circuit |
CN106438521A (en) * | 2016-11-11 | 2017-02-22 | 徐工消防安全装备有限公司 | Hydraulic circuit of the differential telescopic system and aerial work platform using hydraulic circuit of the differential telescopic system |
EP4063668A1 (en) * | 2021-03-23 | 2022-09-28 | CNH Industrial Belgium NV | System to reduce line loss in pressure control hydraulic circuit |
CN116838662A (en) * | 2023-08-30 | 2023-10-03 | 之江实验室 | Hydraulic drive system, control method thereof and hydraulic drive limb part |
-
1995
- 1995-06-30 FR FR9508289A patent/FR2734608A1/en not_active Withdrawn
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001025087A1 (en) * | 1999-10-07 | 2001-04-12 | Honeywell Normalair-Garrett (Holdings) Limited | Hydraulic system for aircraft landing gear |
US6792844B1 (en) | 1999-10-07 | 2004-09-21 | Honeywell Normalair-Garrett (Holdings) Limited | Hydraulic system for aircraft landing gear |
WO2002006679A3 (en) * | 2000-07-05 | 2007-10-25 | Raymond Company | Regeneration circuit |
EP1518768A1 (en) * | 2003-09-24 | 2005-03-30 | Sörensen Hydraulik Zweigniederlassung, Ulfborg, Filial af Sörensen Hydraulik GmbH, Tyskland | Device for supporting platforms |
CN106438521A (en) * | 2016-11-11 | 2017-02-22 | 徐工消防安全装备有限公司 | Hydraulic circuit of the differential telescopic system and aerial work platform using hydraulic circuit of the differential telescopic system |
EP4063668A1 (en) * | 2021-03-23 | 2022-09-28 | CNH Industrial Belgium NV | System to reduce line loss in pressure control hydraulic circuit |
CN116838662A (en) * | 2023-08-30 | 2023-10-03 | 之江实验室 | Hydraulic drive system, control method thereof and hydraulic drive limb part |
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