FR2734607A1 - 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 PDF

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Publication number
FR2734607A1
FR2734607A1 FR9506426A FR9506426A FR2734607A1 FR 2734607 A1 FR2734607 A1 FR 2734607A1 FR 9506426 A FR9506426 A FR 9506426A FR 9506426 A FR9506426 A FR 9506426A FR 2734607 A1 FR2734607 A1 FR 2734607A1
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FR
France
Prior art keywords
cylinder
distributor
fluid
outlet
differential
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.)
Pending
Application number
FR9506426A
Other languages
French (fr)
Inventor
Pierre Mathoulin
Robert Rocher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EHA ENGINEERIE HYDROMECANIQUE
Original Assignee
EHA ENGINEERIE HYDROMECANIQUE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EHA ENGINEERIE HYDROMECANIQUE filed Critical EHA ENGINEERIE HYDROMECANIQUE
Priority to FR9506426A priority Critical patent/FR2734607A1/en
Priority to FR9508289A priority patent/FR2734608A1/en
Publication of FR2734607A1 publication Critical patent/FR2734607A1/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • F15B11/003—Systems with load-holding 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
    • 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
    • F15B2211/30515—Load holding 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
    • F15B2211/31—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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/40—Flow control
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/413—Flow control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional 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
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41581—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a 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
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

The differential hydraulic system is made up of a hydraulic power source (1) supplying a fluid. A distribution valve (2) feeds the jack (3) via the supply feed (4) and the return feed (5). A compact feed differential unit (9) is interposed between the feeds. This unit is actuated, in view of the extension of the rod (3a) of the jack. The unit is arranged to directly transfer oil contained in the chamber (B) of the jack, situated on the rod side, towards the chamber (A) of the jack situated on the opposite side of the piston (3b) of the jack. It achieves this without returning to the distribution valve and thence to the power source thus reducing the power of the installation.

Description

DISPOSITIF HYDRAULIOUE DIFFERENTIEL POUR
ALIMENTATION ET VERROUILLAGE DE VERINS DE
COMMANDE À DOUBLE EFFET
L'objet de l'invention se rapporte au secteur technique des organes de commande hydrauliques de levage et de manutention notamment.DIFFERENTIAL HYDRAULIC DEVICE FOR
FEEDING AND LOCKING OF CYLINDERS
DOUBLE ACTING CONTROL
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 ensemble, 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, answers 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. Thereby,
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 conventional hydraulic circuit (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 the actuators trains of rollers, of cost price by the importance of the equipment and the powers required, as well as pressure losses and heating of important 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 or near the body of the control cylinder, while that the power station and the distributor are fixed on the roof.

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 accompanying 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.

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.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) authorizing 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.

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.FIGS. 3, 4 and 5 show 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 en positions extrêmes (relevée ou abaissée) des trains de galets constituant une double sécurité, en complément des moyens de verrouillage mécaniques.In addition, the circuit thus produced, at the same time a blocking in extreme positions (raised or lowered) of the roller trains constituting double security, in addition to the mechanical locking means.

Avec ce type de circuit hydraulique, on obtient une installation compacte avec réduction sensible des sections de 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 a significant reduction in the pipe sections for satisfactory performance and identical to a higher power installation.

Claims (4)

REVENDICATIONS -1- Dispositif hydraulique différentiel pour alimentation et verrouillage de vérins à double effet, caractérisé en ce que dans le circuit hydraulique de commande du vérin (3), comprenant une centrale hydraulique (1) alimentant en fluide un distributeur (2) puis le vérin (3) par des canalisations d'entrée (4) et de sortie (5), est interposé un dispositif différentiel compact d'alimentation (9) apte, lorsqu'il est actionné en vue de la sortie de la tige (3a) du vérin, à acheminer directement le fluide contenu dans la chambre (B) du vérin, située du côté de ladite tige, vers la chambre (A) du vérin formée à l'opposé du piston (3b) du vérin, sans revenir vers le distributeur et la centrale et en s'ajoutant ainsi au fluide entrant dans le vérin, cela tout en réduisant la puissance de l'installation.-1- Differential hydraulic device for supplying and locking double-acting cylinders, characterized in that in the hydraulic circuit for controlling the cylinder (3), comprising a hydraulic unit (1) supplying a distributor (2) with fluid then the cylinder (3) via inlet (4) and outlet (5) pipes, there is interposed a compact differential supply device (9) capable, when it is actuated with a view to the outlet of the rod (3a) from the cylinder, to direct the fluid contained in the chamber (B) of the cylinder, located on the side of said rod, towards the chamber (A) of the cylinder formed opposite the piston (3b) of the cylinder, without returning to the distributor and the power plant and thus adding to the fluid entering the cylinder, while reducing the power of the installation. -2- Dispositif selon la revendication 1, caractérisé en ce que le dispositif différentiel (9) est constitué par une canalisation dérivée (8) reliant les canalisations d'entrée (4) et de sortie (5) et sur laquelle sont disposés une soupape de contrôle de pression (10) et un organe de pilotage (11) autorisant le passage du fluide en direction de la chambre (A) du vérin ; un clapet anti-retour (7) étant disposé sur la canalisation de sortie (5) pour empêcher le retour du fluide vers le distributeur.-2- Device according to claim 1, characterized in that the differential device (9) consists of a branch pipe (8) connecting the inlet pipes (4) and outlet (5) and on which are arranged a valve pressure control (10) and a control member (11) authorizing the passage of the fluid towards the chamber (A) of the jack; a non-return valve (7) being disposed on the outlet pipe (5) to prevent the return of the fluid to the distributor. -3- Dispositif selon la revendication 2, caractérisé en ce que la soupape (10) est tarée à une valeur suffisante pour équilibrer une charge (6) à déplacer par le vérin en bloquant ainsi cette charge en position (relevée ou abaissée) lorsque le distributeur (2) n'est pas actionné, et en constituant ainsi un verrouillage de sécurité.-3- Device according to claim 2, characterized in that the valve (10) is calibrated to a value sufficient to balance a load (6) to be moved by the cylinder thereby blocking this load in position (raised or lowered) when the distributor (2) is not actuated, and thus constituting a safety interlock. -4- Dispositif selon la revendication 1 appliqué aux manoeuvres de trains de galets (G) de guidage sur rail (R) d'un véhicule (V) de transport urbain du type rail-route, dont les essieux directeurs (E1-E2-E3-E4) sont équipés de pneus (P), caractérisé en ce que chaque bras articulé des trains de galets est équipé d'un vérin à double effet (20) pour relever ou abaisser lesdits galets par l'intermédiaire d'une centrale hydraulique (29) logée en toiture du véhicule, d'un distributeur (28) pour chaque essieu également positionné en toiture et relié par canalisation d'entrée (21) et de sortie (22) à chaque vérin, avec interposition d'un dispositif différentiel (24) par vérin et d'un clapet anti-retour (25). -4- Device according to claim 1 applied to the maneuvers of roller trains (G) guiding on rail (R) of a vehicle (V) of urban transport of the rail-road type, including the steering axles (E1-E2- E3-E4) are equipped with tires (P), characterized in that each articulated arm of the roller trains is equipped with a double-acting cylinder (20) for raising or lowering said rollers by means of a hydraulic unit (29) housed on the roof of the vehicle, a distributor (28) for each axle also positioned on the roof and connected by inlet (21) and outlet (22) pipes to each cylinder, with the interposition of a differential device (24) by cylinder and a non-return valve (25).
FR9506426A 1995-05-24 1995-05-24 Differential hydraulic circuit for feed and locking up of controlled double acting jack Pending FR2734607A1 (en)

Priority Applications (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

Applications Claiming Priority (1)

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

Publications (1)

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FR2734607A1 true FR2734607A1 (en) 1996-11-29

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FR (1) FR2734607A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR996243A (en) * 1949-09-24 1951-12-17 Guided vehicles
DE1087471B (en) * 1956-02-03 1960-08-18 Michelin & Cie Device for the automatic locking, lifting or lowering of a guide element arranged on a vehicle, which is guided in a guide track laid on the roadway
FR2187086A5 (en) * 1972-05-31 1974-01-11 Poclain Sa
EP0503266A1 (en) * 1991-03-11 1992-09-16 HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG Hydraulic control device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR996243A (en) * 1949-09-24 1951-12-17 Guided vehicles
DE1087471B (en) * 1956-02-03 1960-08-18 Michelin & Cie Device for the automatic locking, lifting or lowering of a guide element arranged on a vehicle, which is guided in a guide track laid on the roadway
FR2187086A5 (en) * 1972-05-31 1974-01-11 Poclain Sa
EP0503266A1 (en) * 1991-03-11 1992-09-16 HEILMEIER & WEINLEIN Fabrik für Oel-Hydraulik GmbH & Co. KG Hydraulic control device

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