EP1477614A1 - Device for changing the kinematic at the tool of a hydraulic excavator - Google Patents

Device for changing the kinematic at the tool of a hydraulic excavator Download PDF

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Publication number
EP1477614A1
EP1477614A1 EP04291215A EP04291215A EP1477614A1 EP 1477614 A1 EP1477614 A1 EP 1477614A1 EP 04291215 A EP04291215 A EP 04291215A EP 04291215 A EP04291215 A EP 04291215A EP 1477614 A1 EP1477614 A1 EP 1477614A1
Authority
EP
European Patent Office
Prior art keywords
connecting rod
bucket
cylinder
jack
rod cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04291215A
Other languages
German (de)
French (fr)
Inventor
René Sieffert
Serge Morin
Philippe Jandard
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.)
ATELIERS DE CONSTRUCTIONS DU BEAUJOLAIS
Original Assignee
Ateliers de Construction du Beaujolais
MORIN
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 Ateliers de Construction du Beaujolais, MORIN filed Critical Ateliers de Construction du Beaujolais
Publication of EP1477614A1 publication Critical patent/EP1477614A1/en
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/425—Drive systems for dipper-arms, backhoes or the like

Definitions

  • the object of the present invention is to provide a device to improve the travel of a tool, for example a shovel hydraulic or loader, in the opening direction as in the direction of closing, and providing a gain of effort to the tooth of the bucket or the tool.
  • a tool for example a shovel hydraulic or loader
  • bucket may be replaced by a “coupler + bucket” assembly, which corresponds to the use of a quick coupler inserted between the pendulum and the tool.
  • Hydraulic excavators and excavation machines have an arm articulated, of which the last segment carrying the bucket, called pendulum, is provided with a cylinder controlling the movements of the bucket through a connecting rod made up of connecting rods and levers.
  • the feet of these connecting rods are in pivot connection with the bucket, and the heads of these connecting rods are in connection pivot with the end of the cylinder rod.
  • This end of the bucket cylinder is also in pivot connection with the heads of two levers arranged on the side and on the other side of the balance, the feet of these levers being in pivot connection with the balance.
  • the other end of the bucket cylinder is pivotally connected to the pendulum opposite the bucket.
  • the linkage forms a parallelogram deformable in which the exit of the rod of the bucket cylinder induces a closing movement of the bucket, while the return of the latter produces a reverse opening movement.
  • the object of the invention is achieved by means of a connecting rod jack (or several connecting rod cylinders positioned side by side) of variable length, one end of the connecting rod cylinder being in pivot connection with the end of the bucket cylinder rod on the one hand, and levers articulated on the balance arm on the other hand; the other end of the connecting rod being in pivot connection with the bucket.
  • the translational movement of the connecting rod cylinder thus pushes the bucket travel limits.
  • the pivot axis of the levers located at one end of the balance arm, is distinct and offset by relative to the pivot axis of the bucket towards the other end of the pendulum arm.
  • the device is characterized in that the connecting rod (s) is (are) dimensioned to support the maximum force developed by the linkage between the bucket cylinder and the bucket.
  • the device is characterized in that the hydraulic pressure supply to the connecting rod cylinder is coupled with feeding the bucket cylinder, so that retraction or expansion, of the bucket cylinder respectively causes retraction or expansion of the connecting rod cylinder.
  • the bucket cylinder and the connecting rod cylinder are operated simultaneously, for their expansion as for their retraction.
  • the device is characterized in that the supply circuit includes a non-return valve and / or a flow divider on the two conduits supplying the connecting rod cylinder.
  • the jacks are actuated so sequential, the connecting rod cylinder being expanded once the bucket cylinder fully expanded, and vice versa the bucket cylinder being retracted once the rod cylinder fully retracted.
  • the device is characterized in that the supply circuit has two solenoid valves on the conduits supplying the cylinders, a first limit switch indicating complete expansion of the bucket cylinder and controlling the solenoid valves, a second limit switch indicating complete retraction of the cylinder connecting rod, controlling the same solenoid valves.
  • the device is characterized in that a quick coupler is interposed between the shovel arm and the bucket, the coupler having compatible shapes and dimensions with the size of the connecting rod (s).
  • the device is characterized in that the rod of the connecting rod is provided with a shield-shaped protection or bellows for example.
  • the device is characterized in that the pivot axis of the upper end of the connecting rod cylinder in pivot connection with the bucket cylinder rod is offset below the axis of symmetry and translation of the rod of the connecting rod cylinder.
  • the device is characterized in that the pivot axis of the lower end of the connecting rod cylinder in pivot connection with the bucket is offset below the axis of symmetry and translation of the rod of the connecting rod.
  • FIGS. 6a, 6b show the device according to the prior art.
  • the last segment of the arm articulated hydraulic shovel is a pendulum (4) one end of which is hinged climb on an arrow (not shown) around an axis of rotation (41).
  • a bucket (2) is mounted pivoting through an axis (40), either directly or via a coupler (6).
  • the pendulum (4) is provided with a bucket cylinder (3) which controls the opening and closing of the bucket.
  • the pivot (32) of the end of the rod (31) of the bucket cylinder (3) is in connection with one or two connecting rods (7a, 7b) linked to the bucket cylinder (3).
  • This same end of the rod (31) of the bucket cylinder (3) is also pivotally connected by the common axis (32) with the upper ends of two levers (5a, 5b) arranged symmetrically on either side of the pendulum.
  • the lower end of these levers (5a, 5b) is in pivot connection with the balance (4) by the axis (51).
  • This pivot axis (51) of the levers (5a, 5b) is distinct and offset with respect to the axis of pivoting (40) of the bucket (3), towards the other end of the arm pendulum (4).
  • the bucket (2) is maintained by means of a device quick coupler (6) of known type, or mounted directly on the pendulum.
  • FIGS 1a and 1b show a similar system provided with a connecting rod cylinder (1) according to the invention.
  • This connecting rod cylinder (1) replaces the connecting rods (7a, 7b). Its upper end (10) is in pivot connection with one of the ends of the levers (5c, 5d) by means of the common axis (32) articulated on the rod (31) of the bucket cylinder (3) and its lower end (11) is in pivot connection with the axis (60) of the bucket or of a quick coupling device (6).
  • the levers (5c, 5d) may possibly be different from the original configuration of the balance to ensure that the new kinematics allow sufficient clearance of the connecting rod cylinder (1) relative to the balance (4) and avoid contact between these two parts when the bucket (2) rotates around the pivot axis (40).
  • FIG. 1a shows the bucket (2) in the open position, the rod (12) of the connecting rod cylinder (1) and the rod (31) of the bucket cylinder (3) being both fully retracted.
  • the angle ⁇ 1 of opening of the bucket (2) is then defined.
  • FIG. 1b shows the bucket in the closed position, that is to say that the rods of the two jacks are fully extended, and the angle ⁇ 1 of closing the bucket is then defined.
  • the sum of the angles ⁇ 1 and ⁇ 1 gives the value of the total clearance obtained thanks to the modification of the kinematics provided by the connecting rod jack (1).
  • This travel is of course greater than the value of the original travel, given by the sum of the angles ⁇ and ⁇ .
  • the design of the connecting rod cylinder (1) and the position of the axis (60), allows distribute the gain in travel.
  • An intermediate solution is to distribute the gain in travel between opening and closing.
  • Figure 8 are plotted the moment curves around the axis of rotation of the bucket as a function of the angle of rotation, this for a cylinder of connecting rod and for an original connecting rod.
  • this advantage lies in the additional supply of energy in the movement of the bucket. This results in a significant increase in the moment measured around the pivot axis (40) of the bucket (2).
  • the curve moment obtained with a connecting rod cylinder is above the curve moment obtained with an original connecting rod on almost all of the travel.
  • the gain in time D can reach the significant value of 10% and the gain in travel G obtained with the connecting rod cylinder (1) according to the invention.
  • connecting rod (1) is (are) supplied (s) from the distributor (8) of the machine, in parallel with the bucket cylinder (3) which allows them to be controlled without particular action of the operator of the machine.
  • the additional connecting rod is connected in parallel with the first.
  • actuator control laws (1) and (3) are envisaged.
  • a simultaneous control of the rods of the two cylinders is envisaged in the most cases and is shown in Figure 2a.
  • An order sequential cylinders is shown in Figure 2b. This case responds to case where the connecting rod cylinder is likely to come into contact with the balance (4) during travel.
  • Figure 2a shows a first hydraulic supply diagram of the connecting rod cylinder (1).
  • two non-return valves 82a, 82b. They allow block the cylinder in the event of untimely hose failure supply by maintaining the hydraulic fluid in the two chambers of the connecting rod cylinder (1), and to operate temporarily with a connecting rod become rigid.
  • the power supplies and valves can be offset and / or integrated into the foot or to the rod of the connecting rod cylinder (1).
  • Flow dividers placed on the conduits supply allow to adapt the exit and re-entry speeds of the two cylinders to the desired operation, and thus compensate for the difference in race.
  • Figure 2b shows a power diagram for sequential actuation of the two cylinders: instead of the flow dividers, there are two solenoid valves (84a, 84b) as well as two end-of-life sensors stroke (9a, 9b) on the cylinders.
  • the sensor (9b) detects the retracted position of the connecting rod cylinder, the other (9a) detects the expanded position of the bucket cylinder.
  • the solenoid valve (84a) supplying the connecting rod cylinder (1) is open
  • the solenoid valve (84b) supplying the cylinder bucket (3) is in the closed position.
  • the distributor supplies the pipe (85) thus causing the retraction of the connecting rod cylinder (1), the cylinder bucket (3) remains stationary.
  • the sensor (9b) moves the solenoid valve (84a) to the closed position and the solenoid valve (84b) in the open position, which has the effect, if the position of the distributor has not been modified by the user, to feed the bucket cylinder to start the retraction of the bucket cylinder (3).
  • the sensor (9b) moves the solenoid valve (84a) to the closed position and the solenoid valve (84b) in the open position, which has the effect, if the position of the distributor has not been modified by the user, to feed the bucket cylinder to start the retraction of the bucket cylinder (3).
  • the solenoid valves In this position, if the user wants to reverse the movement of his tool, he reverses the direction of circulation of the hydraulic fluid by supplying the line (86), the solenoid valves not changing position.
  • the pipeline (86) supplied then causes the bucket cylinder (3) to expand while the cylinder connecting rod (1) remains stationary.
  • the limit switch (9a) activates the change of position of the two solenoid valves, the solenoid valve (84b) goes to the closed position and the solenoid valve (84a) in the open position, which allows the actuator to be fed connecting rod (1).
  • the rod cylinder (s) (1) is (are) dimensioned in section and stroke, depending on each model of hydraulic excavator on which wants to adapt it, depending on the size and hydraulic pressures of the carrier, and on the basis of the maximum effort developed by the crankshaft between the bucket (2) and the bucket cylinder (3).
  • the end upper (10) of the connecting rod cylinder (1) is an eyelet or fork adapting to the pivot (32) of the rod (31) of the bucket cylinder (3), a protective part (120) can be added to protect the rod (12) of the jack (1) from external aggressions
  • Figure 3 shows a connecting rod cylinder whose fixing axes each end are aligned with the axis of symmetry (AA) of the cylinder rod connecting rod.
  • Figure 4 shows a connecting rod cylinder whose upper end (10), in pivot connection (32) at the end of the rod (31) of the bucket cylinder (3) is located below the axis of symmetry (AA) of the connecting rod cylinder by a distance (D).
  • This arrangement allows the connecting rod cylinder (1) to be released by relative to the pivot axis (40) avoiding any contact with the end of the pendulum (4) during rotation of the bucket (2).
  • Figure 5 shows an alternative embodiment of the invention where the lower end (11) of the connecting rod cylinder is located below the axis of symmetry and translation (AA) of the connecting rod cylinder (1) and is extended by a shell (13) surrounding the connecting rod cylinder (1) and its rod (12).
  • the device coupler bucket quick coupler is not used and the bucket (2) is directly articulated on the one hand on the balance (4), pivot (40) and on the other hand on the end lower (11) of the connecting rod cylinder (1) pivot (60).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

The device has a connecting rod with a jack (1) comprising two ends (10, 11). The end (10) is in pivot connection (32) with an end of a shaft (31) for activating a bucket (2), and the end (11) is in pivot connection with the bucket. Length of the connecting rod is varied by activating the jack to increase or decrease movement of the bucket. The end (10) is also in pivot connection with levers articulated on a rocking lever (4).

Description

La présente invention a pour objet de proposer un dispositif permettant d'améliorer le débattement d'un outil, par exemple d'une pelle hydraulique ou d'un chargeur, dans le sens de l'ouverture comme dans le sens de la fermeture, et procurant un gain d'effort à la dent du godet ou de l'outil.The object of the present invention is to provide a device to improve the travel of a tool, for example a shovel hydraulic or loader, in the opening direction as in the direction of closing, and providing a gain of effort to the tooth of the bucket or the tool.

Sur une pelle en configuration d'origine, le montage d'un accessoire tel qu'un coupleur d'attache rapide décrit dans le brevet FR 2 657 596 délivré à MORIN FRERES ne permet pas toujours le respect de la cinématique d'origine, et l'on constate parfois une diminution de l'angle de débattement total du godet, dans d'autres cas, la cinématique d'origine a des performances si déplorables qu'il faut impérativement trouver une solution pour améliorer les caractéristiques de creusement avec un minimum de modifications sur le porteur.On an excavator in original configuration, the mounting of an accessory such as a quick coupler described in patent FR 2 657 596 issued at MORIN FRERES does not always allow the respect of the kinematics original, and sometimes there is a decrease in the angle of travel total bucket, in other cases the original kinematics have performances so deplorable that it is imperative to find a solution to improve the digging characteristics with a minimum of modifications on the carrier.

Dans tous le document, la notion de godet pourra être remplacée par un ensemble « coupleur + godet », qui correspond à l'utilisation d'une attache rapide intercalée entre le balancier et l'outil.Throughout the document, the concept of bucket may be replaced by a “coupler + bucket” assembly, which corresponds to the use of a quick coupler inserted between the pendulum and the tool.

Les pelles hydrauliques et machines d'excavation présentent un bras articulé, dont le dernier segment portant le godet, appelé balancier, est pourvu d'un vérin commandant les mouvements du godet par l'intermédiaire d'un embiellage composé de bielles et de leviers. Les pieds de ces bielles sont en liaison pivot avec le godet, et les têtes de ces bielles sont en liaison pivot avec l'extrémité de la tige de vérin. Cette extrémité du vérin de godet est également en liaison pivot avec les têtes de deux leviers disposés de part et d'autre du balancier, les pieds de ces leviers étant en liaison pivot avec le balancier. L'autre extrémité du vérin de godet est en liaison pivot avec le balancier à l'opposé du godet. L'embiellage forme un parallélogramme déformable dans lequel la sortie de la tige du vérin de godet induit un mouvement de fermeture du godet, tandis que la rentrée de celle-ci produit un mouvement d'ouverture inverse. Hydraulic excavators and excavation machines have an arm articulated, of which the last segment carrying the bucket, called pendulum, is provided with a cylinder controlling the movements of the bucket through a connecting rod made up of connecting rods and levers. The feet of these connecting rods are in pivot connection with the bucket, and the heads of these connecting rods are in connection pivot with the end of the cylinder rod. This end of the bucket cylinder is also in pivot connection with the heads of two levers arranged on the side and on the other side of the balance, the feet of these levers being in pivot connection with the balance. The other end of the bucket cylinder is pivotally connected to the pendulum opposite the bucket. The linkage forms a parallelogram deformable in which the exit of the rod of the bucket cylinder induces a closing movement of the bucket, while the return of the latter produces a reverse opening movement.

L'objet de l'invention est atteint par le moyen d'un vérin de bielle (ou de plusieurs vérins de bielle positionnés côte à côte) de longueur variable, une extrémité du vérin de bielle étant en liaison pivot avec l'extrémité de la tige du vérin de godet d'une part, et de leviers articulés sur le bras balancier d'autre part; l'autre extrémité de la bielle étant en liaison pivot avec le godet. Le mouvement de translation du vérin de bielle vient ainsi repousser les limites de débattement du godet.The object of the invention is achieved by means of a connecting rod jack (or several connecting rod cylinders positioned side by side) of variable length, one end of the connecting rod cylinder being in pivot connection with the end of the bucket cylinder rod on the one hand, and levers articulated on the balance arm on the other hand; the other end of the connecting rod being in pivot connection with the bucket. The translational movement of the connecting rod cylinder thus pushes the bucket travel limits.

Selon une autre particularité de l'invention, l'axe de pivotement des leviers, situé à une extrémité du bras balancier, est distinct et décalé par rapport à l'axe de pivotement du godet en direction de l'autre extrémité du bras balancier.According to another feature of the invention, the pivot axis of the levers, located at one end of the balance arm, is distinct and offset by relative to the pivot axis of the bucket towards the other end of the pendulum arm.

Selon une autre particularité, le dispositif est caractérisé en ce que le(s) vérin(s) de bielle est (sont) dimensionné(s) de manière à supporter l'effort maximum développé par l'embiellage entre le vérin de godet et le godet.According to another particularity, the device is characterized in that the connecting rod (s) is (are) dimensioned to support the maximum force developed by the linkage between the bucket cylinder and the bucket.

Selon une autre particularité, le dispositif est caractérisé en ce que l'alimentation en pression hydraulique du vérin de bielle est couplée avec l'alimentation du vérin de godet, de sorte qu'une rétraction ou une expansion, du vérin de godet provoque respectivement une rétraction ou une expansion du vérin de bielle.According to another particularity, the device is characterized in that the hydraulic pressure supply to the connecting rod cylinder is coupled with feeding the bucket cylinder, so that retraction or expansion, of the bucket cylinder respectively causes retraction or expansion of the connecting rod cylinder.

Selon une autre particularité, le vérin de godet et le vérin de bielle sont actionnés simultanément, pour leur expansion comme pour leur rétraction.According to another particular feature, the bucket cylinder and the connecting rod cylinder are operated simultaneously, for their expansion as for their retraction.

Selon une autre particularité, le dispositif est caractérisé en ce que le circuit d'alimentation comporte un clapet anti-retour et/ou un diviseur de débit sur les deux conduits alimentant le vérin de bielle.According to another particularity, the device is characterized in that the supply circuit includes a non-return valve and / or a flow divider on the two conduits supplying the connecting rod cylinder.

Selon une autre particularité, les vérins sont actionnés de façon séquentielle, le vérin de bielle étant expansé une fois le vérin de godet entièrement expansé, et inversement le vérin de godet étant rétracté une fois le vérin de bielle entièrement rétracté.According to another particular feature, the jacks are actuated so sequential, the connecting rod cylinder being expanded once the bucket cylinder fully expanded, and vice versa the bucket cylinder being retracted once the rod cylinder fully retracted.

Selon une autre particularité, le dispositif est caractérisé en ce que le circuit d'alimentation comporte deux électrovannes sur les conduits alimentant les vérins, un premier capteur de fin de course indiquant l'expansion complète du vérin de godet et commandant les électrovannes, un deuxième capteur de fin de course indiquant la rétraction complète du vérin de bielle, commandant les mêmes électrovannes.According to another particularity, the device is characterized in that the supply circuit has two solenoid valves on the conduits supplying the cylinders, a first limit switch indicating complete expansion of the bucket cylinder and controlling the solenoid valves, a second limit switch indicating complete retraction of the cylinder connecting rod, controlling the same solenoid valves.

Selon une autre particularité, le dispositif est caractérisé en ce qu'un coupleur d'attache rapide est intercalé entre le balancier de la pelle et le godet, le coupleur présentant des formes et des dimensions compatibles avec l'encombrement du (des) vérin(s) de bielle.According to another particularity, the device is characterized in that a quick coupler is interposed between the shovel arm and the bucket, the coupler having compatible shapes and dimensions with the size of the connecting rod (s).

Selon une autre particularité, le dispositif est caractérisé en ce que la tige du vérin de bielle est pourvue d'une protection en forme de bouclier ou de soufflet par exemple.According to another particularity, the device is characterized in that the rod of the connecting rod is provided with a shield-shaped protection or bellows for example.

Selon une autre particularité, le dispositif est caractérisé en ce que l'axe de pivot de l'extrémité supérieure du vérin de bielle en liaison pivot avec la tige du vérin de godet est décalé en dessous de l'axe de symétrie et de translation de la tige du vérin de bielle.According to another particularity, the device is characterized in that the pivot axis of the upper end of the connecting rod cylinder in pivot connection with the bucket cylinder rod is offset below the axis of symmetry and translation of the rod of the connecting rod cylinder.

Selon une autre particularité, le dispositif est caractérisé en ce que l'axe de pivot de l'extrémité inférieure du vérin de bielle en liaison pivot avec le godet est décalé en dessous de l'axe de symétrie et de translation de la tige du vérin de bielle.According to another particularity, the device is characterized in that the pivot axis of the lower end of the connecting rod cylinder in pivot connection with the bucket is offset below the axis of symmetry and translation of the rod of the connecting rod.

Selon une autre particularité, le dispositif est caractérisé en ce que l'extrémité inférieure du vérin de bielle se prolonge en une coque contenant le vérin de bielle et sa tige, deux ouvertures parallèles étant pratiquées sur les faces latérales de la coque pour permettre le passage d'un axe de fixation de l'extrémité supérieure du vérin de bielle. L'invention, avec ses caractéristiques et avantages, ressortira plus clairement à la lecture de la description faite en référence aux dessins annexés dans lesquels :

  • les figures 1a et 1b représentent un schéma du balancier muni d'un vérin de bielle selon l'invention, le godet étant respectivement en position ouverte et fermée ;
  • les figures 2a et 2b représentent des schémas d'alimentation hydraulique du vérin de bielle;
  • les figures 3, 4 et 5 montrent des variantes de réalisation du vérin de bielle selon l'invention ;
  • les figures 6a et 6b représentent un schéma du balancier d'une pelle hydraulique en configuration d'origine, sans vérin de bielle, le godet étant respectivement en position ouverte et fermée ;
  • les figures 7a et 7b montrent une superposition des positions angulaires extrêmes atteintes par le godet selon l'art antérieur et selon l'invention respectivement en position ouverte et en position fermée;
  • la figure 8 montre une courbe comparative du moment mesuré autour de l'axe de rotation du godet en fonction de l'angle de rotation, ceci pour un vérin de bielle et pour une bielle d'origine.
According to another particularity, the device is characterized in that the lower end of the connecting rod cylinder is extended into a shell containing the connecting rod cylinder and its rod, two parallel openings being made on the lateral faces of the shell to allow passage a pin for fixing the upper end of the connecting rod cylinder. The invention, with its characteristics and advantages, will emerge more clearly on reading the description made with reference to the appended drawings in which:
  • Figures 1a and 1b show a diagram of the balance provided with a connecting rod cylinder according to the invention, the bucket being respectively in the open and closed position;
  • Figures 2a and 2b show diagrams of hydraulic supply of the connecting rod cylinder;
  • Figures 3, 4 and 5 show alternative embodiments of the connecting rod cylinder according to the invention;
  • Figures 6a and 6b show a diagram of the balance of a hydraulic excavator in the original configuration, without connecting rod cylinder, the bucket being respectively in the open and closed position;
  • Figures 7a and 7b show a superposition of the extreme angular positions reached by the bucket according to the prior art and according to the invention respectively in the open position and in the closed position;
  • FIG. 8 shows a comparative curve of the moment measured around the axis of rotation of the bucket as a function of the angle of rotation, this for a connecting rod cylinder and for an original connecting rod.

L'invention va maintenant être décrite en référence aux figures 6a, 6b, qui montrent le dispositif suivant l'art antérieur. Le dernier segment du bras articulé de pelle hydraulique est un balancier (4) dont une extrémité est montée articulée sur une flèche (non représentée) autour d'un axe de rotation (41). Sur l'autre extrémité du balancier (4), un godet (2) est monté pivotant par le biais d'un axe (40), soit directement soit par l'intermédiaire d'un coupleur (6). Le balancier (4) est muni d'un vérin de godet (3) qui commande l'ouverture et la fermeture du godet. Le pivot (32) de l'extrémité de la tige (31) du vérin de godet (3) est en liaison avec une ou deux bielles (7a, 7b) liées au vérin de godet (3). Cette même extrémité de la tige (31) du vérin de godet (3) est également en liaison pivot par l'axe commun (32) avec les extrémités supérieures de deux leviers (5a, 5b) disposés symétriquement de part et d'autre du balancier. L'extrémité inférieure de ces leviers (5a, 5b) est en liaison pivot avec le balancier (4) par l'axe (51). Cet axe de pivotement (51) des leviers (5a, 5b) est distinct et décalé par rapport à l'axe de pivotement (40) du godet (3), en direction de l'autre extrémité du bras balancier (4). Le godet (2) est maintenu par l'intermédiaire d'un dispositif d'attache rapide (6) de type connu, ou monté directement sur le balancier. Sur la figure 6a, on peut voir le godet (2) en position ouverte, la tige (31) du vérin de godet (3) étant entièrement rentrée. On peut ainsi définir l'angle α d'ouverture du godet dans le repère orthogonal direct formé par les axes du balancier X et Y. Sur la figure 6b, la tige (31) du vérin de godet (3) est entièrement sortie, et le godet est alors en position fermée. On peut ainsi définir l'angle β de fermeture du godet (2) dans le repère (X, Y).The invention will now be described with reference to FIGS. 6a, 6b, which show the device according to the prior art. The last segment of the arm articulated hydraulic shovel is a pendulum (4) one end of which is hinged climb on an arrow (not shown) around an axis of rotation (41). On the other end of the balance (4), a bucket (2) is mounted pivoting through an axis (40), either directly or via a coupler (6). The pendulum (4) is provided with a bucket cylinder (3) which controls the opening and closing of the bucket. The pivot (32) of the end of the rod (31) of the bucket cylinder (3) is in connection with one or two connecting rods (7a, 7b) linked to the bucket cylinder (3). This same end of the rod (31) of the bucket cylinder (3) is also pivotally connected by the common axis (32) with the upper ends of two levers (5a, 5b) arranged symmetrically on either side of the pendulum. The lower end of these levers (5a, 5b) is in pivot connection with the balance (4) by the axis (51). This pivot axis (51) of the levers (5a, 5b) is distinct and offset with respect to the axis of pivoting (40) of the bucket (3), towards the other end of the arm pendulum (4). The bucket (2) is maintained by means of a device quick coupler (6) of known type, or mounted directly on the pendulum. In Figure 6a, we can see the bucket (2) in the open position, the rod (31) of the bucket cylinder (3) being fully retracted. We can thus define the angle α opening of the bucket in the direct orthogonal coordinate system formed by the axes of the pendulum X and Y. In FIG. 6b, the rod (31) of the bucket cylinder (3) is fully extended, and the bucket is then in the closed position. We can thus define the closing angle β of the bucket (2) in the reference (X, Y).

Les figures 1a et 1b montrent un système similaire pourvu d'un vérin de bielle (1) selon l'invention. Ce vérin de bielle (1) remplace les bielles (7a, 7b). Son extrémité supérieure (10) est en liaison pivot avec l'une des extrémités des leviers (5c, 5d) par le moyen de l'axe commun (32) articulé sur la tige (31 ) du vérin de godet (3) et son extrémité inférieure (11) est en liaison pivot avec l'axe (60) du godet ou d'un dispositif d'attache rapide (6). Les leviers (5c, 5d) peuvent éventuellement être différents de la configuration d'origine du balancier pour assurer que la nouvelle cinématique permette un dégagement suffisant du vérin de bielle (1) par rapport au balancier (4) et éviter tout contact entre ces deux pièces lors de la rotation du godet (2) autour de l'axe de pivotement (40). La figure 1a montre le godet (2) en position ouverte, la tige (12) du vérin de bielle (1) et la tige (31) du vérin de godet (3) étant toutes deux entièrement rentrées. Dans le repère orthogonal (X, Y) on définit alors l'angle α1 d'ouverture du godet (2). La figure 1b montre le godet en position de fermeture, c'est-à-dire que les tiges des deux vérins sont entièrement sorties, et l'on définit alors l'angle β1 de fermeture du godet. La somme des angles α1 et β1 donne la valeur du débattement total obtenu grâce à la modification de la cinématique apportée par le vérin de bielle (1).Figures 1a and 1b show a similar system provided with a connecting rod cylinder (1) according to the invention. This connecting rod cylinder (1) replaces the connecting rods (7a, 7b). Its upper end (10) is in pivot connection with one of the ends of the levers (5c, 5d) by means of the common axis (32) articulated on the rod (31) of the bucket cylinder (3) and its lower end (11) is in pivot connection with the axis (60) of the bucket or of a quick coupling device (6). The levers (5c, 5d) may possibly be different from the original configuration of the balance to ensure that the new kinematics allow sufficient clearance of the connecting rod cylinder (1) relative to the balance (4) and avoid contact between these two parts when the bucket (2) rotates around the pivot axis (40). Figure 1a shows the bucket (2) in the open position, the rod (12) of the connecting rod cylinder (1) and the rod (31) of the bucket cylinder (3) being both fully retracted. In the orthogonal coordinate system (X, Y), the angle α 1 of opening of the bucket (2) is then defined. FIG. 1b shows the bucket in the closed position, that is to say that the rods of the two jacks are fully extended, and the angle β 1 of closing the bucket is then defined. The sum of the angles α 1 and β 1 gives the value of the total clearance obtained thanks to the modification of the kinematics provided by the connecting rod jack (1).

La valeur de ce débattement est bien sûr supérieure à la valeur du débattement d'origine, donnée par la somme des angles α et β. La conception du vérin de bielle (1) et de la position de l'axe (60), permet de répartir le gain en débattement. Ainsi, on pourra choisir d'augmenter au maximum l'angle α1 d'ouverture du godet (2), l'angle de fermeture β1 restant identique à β, ou bien d'augmenter au maximum l'angle de fermeture β1, l'angle d'ouverture α1 restant identique à la configuration d'origine α.The value of this travel is of course greater than the value of the original travel, given by the sum of the angles α and β. The design of the connecting rod cylinder (1) and the position of the axis (60), allows distribute the gain in travel. Thus, we can choose to increase at maximum angle α1 of opening of bucket (2), closing angle β1 remaining identical to β, or to increase the closing angle β1 as much as possible, the opening angle α1 remaining identical to the original configuration α.

Une solution intermédiaire consiste à répartir le gain en débattement entre l'ouverture et la fermeture. An intermediate solution is to distribute the gain in travel between opening and closing.

Les figures 7a et 7b montrent par superposition les différences des positions angulaires extrêmes: γ = (α1-α) en ouverture et δ= (β1-β) en fermeture obtenues grâce à un dispositif selon l'invention d'une part et par une cinématique d'origine d'autre part. Il ressort de ces figures l'avantage d'une fermeture plus importante permettant une meilleure retenue du contenu du godet (2) en position de chargement, et l'avantage à l'ouverture pour le creusement de parois verticales à proximité du porteur, l'ensemble étant obtenu avec le vérin de bielle (1) selon l'invention.Figures 7a and 7b show by superimposition the differences of extreme angular positions: γ = (α1-α) in opening and δ = (β1-β) in closure obtained by a device according to the invention on the one hand and by an original kinematics on the other hand. It appears from these figures the advantage of a larger closure allowing better retention the contents of the bucket (2) in the loading position, and the advantage the opening for digging vertical walls near the carrier, the assembly being obtained with the connecting rod cylinder (1) according to the invention.

Sur la figure 8 sont tracées les courbes de moment autour de l'axe de rotation du godet en fonction de l'angle de rotation, ceci pour un vérin de bielle et pour une bielle d'origine. La figure 8 met ainsi en valeur un deuxième avantage important du dispositif par rapport à la configuration d'origine : cet avantage réside dans l'apport supplémentaire d'énergie dans le mouvement du godet. Il en résulte une augmentation significative du moment mesuré autour de l'axe de pivotement (40) du godet (2). La courbe de moment obtenue avec un vérin de bielle se situe au-dessus de la courbe de moment obtenue avec une bielle d'origine sur la quasi-totalité du débattement. On note sur la figure 8, le gain en moment D pouvant atteindre la valeur significative de 10% et le gain en débattement G obtenus avec le vérin de bielle (1) selon l'invention.In Figure 8 are plotted the moment curves around the axis of rotation of the bucket as a function of the angle of rotation, this for a cylinder of connecting rod and for an original connecting rod. Figure 8 thus highlights a second important advantage of the device compared to the configuration original: this advantage lies in the additional supply of energy in the movement of the bucket. This results in a significant increase in the moment measured around the pivot axis (40) of the bucket (2). The curve moment obtained with a connecting rod cylinder is above the curve moment obtained with an original connecting rod on almost all of the travel. We note in Figure 8, the gain in time D can reach the significant value of 10% and the gain in travel G obtained with the connecting rod cylinder (1) according to the invention.

Un exemple de réalisation de l'invention va maintenant être décrit plus particulièrement en référence aux figures 2a et 2b. Le(s) vérin(s) de bielle (1) est (sont) alimenté(s) à partir du distributeur (8) de l'engin, en parallèle avec le vérin de godet (3) ce qui permet de les commander sans action particulière du conducteur de l'engin. Dans le cas de plusieurs vérins de bielle, le vérin additionnel de bielle, est branché en parallèle du premier.An embodiment of the invention will now be described more particularly with reference to Figures 2a and 2b. The cylinder (s) of connecting rod (1) is (are) supplied (s) from the distributor (8) of the machine, in parallel with the bucket cylinder (3) which allows them to be controlled without particular action of the operator of the machine. In the case of several cylinders connecting rod, the additional connecting rod, is connected in parallel with the first.

Plusieurs lois de commande des vérins (1) et (3) sont envisagées. Une commande simultanée des tiges des deux vérins est envisagée dans la plupart des cas et est représentée par la figure 2a. Une commande séquentielle des vérins est représentée par la figure 2b. Ce cas répond au cas où le vérin de bielle est susceptible d'entrer en contact avec le balancier (4) au cours du débattement. On pourra envisager une sortie et une rentrée successives des tiges des deux vérins: la sortie du vérin de bielle (1) étant actionnée une fois le vérin de godet (3) sorti, la rentrée des vérins s'effectuant dans l'ordre inverse.Several actuator control laws (1) and (3) are envisaged. A simultaneous control of the rods of the two cylinders is envisaged in the most cases and is shown in Figure 2a. An order sequential cylinders is shown in Figure 2b. This case responds to case where the connecting rod cylinder is likely to come into contact with the balance (4) during travel. We can consider an exit and a return successive rods of the two cylinders: the output of the connecting rod cylinder (1) being actuated once the bucket cylinder (3) is out, the cylinders are retracted taking place in reverse order.

La figure 2a représente un premier schéma d'alimentation hydraulique du vérin de bielle (1). Sur chaque conduit (83a, 83b) alimentant le vérin de bielle sont disposés deux clapets anti-retour (82a, 82b). Ils permettent d'assurer un blocage du vérin en cas de rupture intempestive des flexibles d'alimentation en maintenant le fluide hydraulique dans les deux chambres du vérin de bielle (1), et de fonctionner provisoirement avec une bielle devenue rigide. Pour diminuer les risques d'arrachement des flexibles, les alimentations et les clapets pourront être déportées et/ou intégrés au pied ou à la tige du vérin de bielle (1).Figure 2a shows a first hydraulic supply diagram of the connecting rod cylinder (1). On each conduit (83a, 83b) supplying the cylinder connecting rod are arranged two non-return valves (82a, 82b). They allow block the cylinder in the event of untimely hose failure supply by maintaining the hydraulic fluid in the two chambers of the connecting rod cylinder (1), and to operate temporarily with a connecting rod become rigid. To reduce the risk of hose tearing, the power supplies and valves can be offset and / or integrated into the foot or to the rod of the connecting rod cylinder (1).

Les diviseurs de débit (81a, 81b) placés sur les conduits d'alimentation permettent d'adapter les vitesses de sortie et de rentrée des deux vérins au fonctionnement désiré, et de compenser ainsi la différence de course. On pourra choisir de rendre le déplacement du vérin de bielle plus rapide ou plus lent que celui du vérin de godet, ou bien d'avoir des vitesses sensiblement identiques pour les deux vérins. Si les deux diviseurs de débit sont remplacés par de simples passages, le mode de fonctionnement est libre, les vérins positionnent leur course au gré des efforts dans l'embiellage, les avantages de l'invention étant aussi conservées.Flow dividers (81a, 81b) placed on the conduits supply allow to adapt the exit and re-entry speeds of the two cylinders to the desired operation, and thus compensate for the difference in race. We can choose to make the displacement of the connecting rod cylinder more faster or slower than that of the bucket cylinder, or having speeds substantially identical for the two cylinders. If the two flow dividers are replaced by simple passages, the operating mode is free, the jacks position their stroke according to the efforts in the connecting rod assembly, the advantages of the invention also being preserved.

La figure 2b montre un schéma d'alimentation permettant l'actionnement séquentiel des deux vérins: à la place des diviseurs de débit, on dispose deux électrovannes (84a, 84b) ainsi que deux capteurs de fin de course (9a, 9b) sur les vérins. Le capteur (9b) détecte la position rétractée du vérin de bielle, l'autre (9a) détecte la position expansée du vérin de godet. Lorsque les deux vérins sont expansés, l'électrovanne (84a) alimentant le vérin de bielle (1) est ouverte, et l'électrovanne (84b) alimentant le vérin de godet (3) est en position fermée. Lorsque le distributeur alimente la canalisation (85) provoquant ainsi la rétraction du vérin de bielle (1), le vérin de godet (3) reste immobile. Lorsque le vérin de bielle est entièrement rétracté, le capteur (9b) fait passer l'électrovanne (84a) en position fermée et l'électrovanne (84b) en position ouverte, ce qui a pour effet, si la position du distributeur n'a pas été modifiée par l'utilisateur, d'alimenter le vérin de godet pour amorcer la rentrée du vérin de godet (3). Dans cette position, si l'utilisateur veut inverser le mouvement de son outil, il inverse le sens de circulation du fluide hydraulique en alimentant la canalisation (86), les électrovannes ne changeant pas de position. La canalisation (86) alimentée provoque alors l'expansion du vérin de godet (3) pendant que le vérin de bielle (1) reste immobile. Lorsque le vérin de godet (3) est entièrement expansé, le capteur de fin de course (9a) active le changement de position des deux électrovannes, l'électrovanne (84b) passe en position fermée et l'électrovanne (84a) en position ouverte, ce qui permet l'alimentation du vérin de bielle (1 ) .Figure 2b shows a power diagram for sequential actuation of the two cylinders: instead of the flow dividers, there are two solenoid valves (84a, 84b) as well as two end-of-life sensors stroke (9a, 9b) on the cylinders. The sensor (9b) detects the retracted position of the connecting rod cylinder, the other (9a) detects the expanded position of the bucket cylinder. When the two cylinders are expanded, the solenoid valve (84a) supplying the connecting rod cylinder (1) is open, and the solenoid valve (84b) supplying the cylinder bucket (3) is in the closed position. When the distributor supplies the pipe (85) thus causing the retraction of the connecting rod cylinder (1), the cylinder bucket (3) remains stationary. When the connecting rod cylinder is fully retracted, the sensor (9b) moves the solenoid valve (84a) to the closed position and the solenoid valve (84b) in the open position, which has the effect, if the position of the distributor has not been modified by the user, to feed the bucket cylinder to start the retraction of the bucket cylinder (3). In this position, if the user wants to reverse the movement of his tool, he reverses the direction of circulation of the hydraulic fluid by supplying the line (86), the solenoid valves not changing position. The pipeline (86) supplied then causes the bucket cylinder (3) to expand while the cylinder connecting rod (1) remains stationary. When the bucket cylinder (3) is fully expanded, the limit switch (9a) activates the change of position of the two solenoid valves, the solenoid valve (84b) goes to the closed position and the solenoid valve (84a) in the open position, which allows the actuator to be fed connecting rod (1).

Le(s) vérin(s) de bielle (1) est (sont) dimensionné(s) en section et course, en fonction de chaque modèle de pelle hydraulique sur lequel on veut l'adapter, en fonction de l'encombrement et des pressions hydrauliques du porteur, et sur la base de l'effort maximum développé par l'embiellage entre le godet (2) et le vérin de godet (3).The rod cylinder (s) (1) is (are) dimensioned in section and stroke, depending on each model of hydraulic excavator on which wants to adapt it, depending on the size and hydraulic pressures of the carrier, and on the basis of the maximum effort developed by the crankshaft between the bucket (2) and the bucket cylinder (3).

Sur les figures 3, 4 et 5, on peut voir différentes variantes de réalisation du dispositif selon l'invention. Dans tous les cas, l'extrémité supérieure (10) du vérin de bielle (1) est un oeillet ou une fourche s'adaptant au pivot (32) de la tige (31) du vérin de godet (3), une pièce de protection (120) pourra être ajoutée pour protéger la tige (12) du vérin (1) des agressions extérieuresIn Figures 3, 4 and 5, we can see different variants of realization of the device according to the invention. In any case, the end upper (10) of the connecting rod cylinder (1) is an eyelet or fork adapting to the pivot (32) of the rod (31) of the bucket cylinder (3), a protective part (120) can be added to protect the rod (12) of the jack (1) from external aggressions

La figure 3 présente un vérin de bielle dont les axes de fixation de chaque extrémité sont alignés avec l'axe de symétrie (AA) de la tige du vérin de bielle.Figure 3 shows a connecting rod cylinder whose fixing axes each end are aligned with the axis of symmetry (AA) of the cylinder rod connecting rod.

La figure 4 représente un vérin de bielle dont l'extrémité supérieure (10), en liaison pivot (32) à l'extrémité de la tige (31) du vérin de godet (3) se situe en dessous de l'axe de symétrie (AA) du vérin de bielle d'une distance (D). Cette disposition permet un dégagement du vérin de bielle (1) par rapport à l'axe de pivotement (40) évitant tout contact avec l'extrémité du balancier (4) lors de la rotation du godet (2). Figure 4 shows a connecting rod cylinder whose upper end (10), in pivot connection (32) at the end of the rod (31) of the bucket cylinder (3) is located below the axis of symmetry (AA) of the connecting rod cylinder by a distance (D). This arrangement allows the connecting rod cylinder (1) to be released by relative to the pivot axis (40) avoiding any contact with the end of the pendulum (4) during rotation of the bucket (2).

La figure 5 montre une variante de réalisation de l'invention où l'extrémité inférieure (11) du vérin de bielle est située en dessous de l'axe de symétrie et de translation (AA) du vérin de bielle (1) et est prolongée par une coque (13) entourant le vérin de bielle (1) et sa tige (12). Deux ouvertures (130) parallèles débouchantes pratiquées sur les faces latérales de la coque (13), permettent le passage de l'axe de fixation (32) commun à l'extrémité (10) du vérin de bielle, au vérin de godet (2) et aux leviers (5a, 5b). Ainsi la translation de la tige (12) du vérin de bielle (1) se fait de façon protégée à l'intérieur de la coque (13) et permet de reprendre les efforts de flexion de la tige dus au déport (D) de l'extrémité inférieure (11) par rapport à l'axe de symétrie de la tige (12), éliminant ainsi tout risque de flambement de la tige (12) du vérin de bielle (1).Figure 5 shows an alternative embodiment of the invention where the lower end (11) of the connecting rod cylinder is located below the axis of symmetry and translation (AA) of the connecting rod cylinder (1) and is extended by a shell (13) surrounding the connecting rod cylinder (1) and its rod (12). Two openings (130) through parallels formed on the lateral faces of the hull (13), allow the passage of the fixing pin (32) common at the end (10) from the connecting rod cylinder, to the bucket cylinder (2) and to the levers (5a, 5b). So the translation of the rod (12) of the connecting rod cylinder (1) is done in a protected manner the interior of the shell (13) and allows the bending forces of the rod due to offset (D) of the lower end (11) relative to the axis of rod symmetry (12), thereby eliminating any risk of the rod buckling (12) of the connecting rod cylinder (1).

Dans une variante d'utilisation de l'invention le coupleur du dispositif d'attache rapide du godet n'est pas utilisé et le godet (2) est directement articulé d'une part sur le balancier (4), pivot (40) et d'autre part sur l'extrémité inférieure (11) du vérin de bielle (1) pivot (60).In a variant use of the invention, the device coupler bucket quick coupler is not used and the bucket (2) is directly articulated on the one hand on the balance (4), pivot (40) and on the other hand on the end lower (11) of the connecting rod cylinder (1) pivot (60).

Il doit être évident pour les personnes versées dans l'art que la présente invention permet des modes de réalisation sous de nombreuses autres formes spécifiques sans l'éloigner du domaine d'application de l'invention comme revendiqué. Par conséquent, les présents modes de réalisation doivent être considérés à titre d'illustration mais peuvent être modifiés dans le domaine défini par la portée des revendications jointes.It should be obvious to those skilled in the art that the present invention allows embodiments under many other specific forms without departing from the scope of the invention as claimed. Therefore, the present modes of realization must be considered as illustration but can be modified in the field defined by the scope of the appended claims.

Claims (13)

Dispositif permettant d'augmenter le débattement et l'effort développé par un godet articulé au bout d'un balancier (4), d'une pelle hydraulique ou d'un chargeur, comportant au moins un vérin de bielle (1) de longueur variable, caractérisé en ce que: l'extrémité (10) du vérin de bielle (1) est en liaison pivot (32) d'une part avec l'extrémité de la tige (31) du vérin (3) d'actionnement du godet (2) et d'autre part avec un levier (5a, 5b) articulé sur le bras balancier (4), l'extrémité (11) du vérin de bielle est en liaison pivot avec le godet ou le coupleur recevant l'outil (2), les variations de longueur du vérin de bielle venant augmenter et/ou diminuer les limites du débattement du godet (2).Device making it possible to increase the travel and the force developed by an articulated bucket at the end of a balance (4), a hydraulic shovel or a loader, comprising at least one connecting rod jack (1) of variable length , characterized in that : the end (10) of the connecting rod jack (1) is in pivot connection (32) on the one hand with the end of the rod (31) of the jack (3) actuating the bucket (2) and on the other hand with a lever (5a, 5b) articulated on the balance arm (4), the end (11) of the connecting rod cylinder is in pivot connection with the bucket or the coupler receiving the tool (2), the variations in length of the connecting rod jack increasing and / or decreasing the limits of the travel of the bucket (2). Dispositif selon la revendication 1, caractérisé en ce que le(s) vérin(s) de bielle (1) est (sont) dimensionné(s) de manière à supporter l'effort maximum développé par l'embiellage entre le vérin de godet (3) et le godet (2).Device according to claim 1, characterized in that the rod cylinder (s) (1) is (are) dimensioned so as to withstand the maximum force developed by the crankshaft between the bucket cylinder ( 3) and the bucket (2). Dispositif selon la revendication 1 et 2, caractérisé en ce que l'axe de pivotement (51) des leviers (5c, 5d), situé à une extrémité du bras balancier (4), est distinct et décalé par rapport à l'axe de pivotement (40) du godet (2) en direction de l'autre extrémité du bras balancier (4).Device according to claim 1 and 2, characterized in that the pivot axis (51) of the levers (5c, 5d), located at one end of the balance arm (4), is distinct and offset with respect to the axis of pivoting (40) of the bucket (2) towards the other end of the balance arm (4). Dispositif selon la revendication 1, caractérisé en ce que l'alimentation en pression hydraulique du (des) vérin(s) de bielle (1) est couplée avec l'alimentation du vérin de godet (3), de sorte qu'une rétraction ou une expansion du vérin (3) provoque respectivement une rétraction ou une expansion du (des) vérin(s) de bielle (1).Device according to claim 1, characterized in that the hydraulic pressure supply of the connecting rod cylinder (s) (1) is coupled with the supply of the bucket cylinder (3), so that a retraction or an expansion of the jack (3) respectively causes a retraction or an expansion of the connecting rod jack (s) (1). Dispositif selon la revendication 4, caractérisé en ce que le vérin de godet (3) et le(s) vérin(s) de bielle (1) sont actionnés simultanément, pour leur expansion comme pour leur rétraction. Device according to claim 4, characterized in that the bucket cylinder (3) and the rod cylinder (s) (1) are actuated simultaneously, for their expansion as for their retraction. Dispositif selon la revendication 4 ou 5, caractérisé en ce que le circuit d'alimentation comporte un clapet anti-retour (82a,82b) et/ou un diviseur de débit (81a,81b) sur les deux conduits (83a,83b) alimentant le(s) vérin(s) de bielle.Device according to claim 4 or 5, characterized in that the supply circuit comprises a non-return valve (82a, 82b) and / or a flow divider (81a, 81b) on the two conduits (83a, 83b) supplying the connecting rod (s). Dispositif selon la revendication 4, caractérisé en ce que les vérins sont actionnés de façon séquentielle, le(s) vérin(s) de bielle (1) étant expansé(s) une fois le vérin de godet (3) entièrement expansé, et inversement le vérin de godet (3) étant rétracté une fois le(s) vérin(s) de bielle (1) entièrement rétracté(s).Device according to claim 4, characterized in that the jacks are actuated sequentially, the rod jack (s) (1) being expanded once the bucket jack (3) is fully expanded, and vice versa the bucket cylinder (3) being retracted once the connecting rod cylinder (s) (1) is fully retracted. Dispositif selon la revendication 7, caractérisé en ce que le circuit d'alimentation comporte une électrovanne (84a, 84b) sur les deux conduits (83a, 83b) alimentant le vérin de bielle (1), un premier capteur de fin de course (9a) indiquant l'expansion complète du vérin de godet (3), un deuxième capteur de fin de course (9b) indiquant la rétraction complète du (des) vérin(s) de bielle (1).Device according to claim 7, characterized in that the supply circuit comprises a solenoid valve (84a, 84b) on the two conduits (83a, 83b) supplying the connecting rod cylinder (1), a first limit switch (9a ) indicating the complete expansion of the bucket cylinder (3), a second limit switch (9b) indicating the complete retraction of the connecting rod cylinder (s) (1). Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'un coupleur (6) est intercalé entre le balancier (4) de la pelle et le godet (2), le coupleur (6) présentant des formes et des dimensions compatibles avec l'encombrement du vérin de bielle.Device according to one of the preceding claims, characterized in that a coupler (6) is interposed between the balance (4) of the shovel and the bucket (2), the coupler (6) having shapes and dimensions compatible with the size of the connecting rod cylinder. Dispositif selon l'une des revendications précédentes, caractérisé en ce que la tige (12) du vérin de bielle (1) est pourvue d'une pièce de protection (120).Device according to one of the preceding claims, characterized in that the rod (12) of the connecting rod cylinder (1) is provided with a protective part (120). Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'axe du pivot (32) de l'extrémité supérieure (10) du vérin de bielle en liaison pivot avec la tige (31) du vérin de godet (3) est décalé en dessous de l'axe de symétrie de la tige du vérin de bielle (1).Device according to one of the preceding claims, characterized in that the axis of the pivot (32) of the upper end (10) of the connecting rod cylinder in pivot connection with the rod (31) of the bucket cylinder (3) is offset below the axis of symmetry of the rod of the connecting rod cylinder (1). Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'axe du pivot (60) de l'extrémité inférieure (11) du vérin de bielle en liaison pivot avec le godet (2) est décalé en dessous de l'axe de symétrie de la tige (12) du vérin de bielle (1). Device according to one of the preceding claims, characterized in that the axis of the pivot (60) of the lower end (11) of the connecting rod cylinder in pivot connection with the bucket (2) is offset below the axis of symmetry of the rod (12) of the connecting rod cylinder (1). Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'extrémité inférieure (11) du vérin de bielle (1) se prolonge en une coque (13) contenant le vérin de bielle (1) et sa tige (12), deux rainures parallèles débouchantes étant pratiquées sur les faces latérales de la coque (13) pour permettre le passage d'un axe de fixation (32) de l'extrémité supérieure (10) du vérin de bielle.Device according to one of the preceding claims, characterized in that the lower end (11) of the connecting rod jack (1) is extended into a shell (13) containing the connecting rod jack (1) and its rod (12), two parallel through grooves being formed on the lateral faces of the shell (13) to allow the passage of a fixing pin (32) of the upper end (10) of the connecting rod jack.
EP04291215A 2003-05-12 2004-05-12 Device for changing the kinematic at the tool of a hydraulic excavator Withdrawn EP1477614A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0305691 2003-05-12
FR0305691A FR2854910B1 (en) 2003-05-12 2003-05-12 DEVICE FOR MODIFYING THE KINEMATIC OF A HYDRAULIC SHOVEL TOOL

Publications (1)

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EP1477614A1 true EP1477614A1 (en) 2004-11-17

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EP04291215A Withdrawn EP1477614A1 (en) 2003-05-12 2004-05-12 Device for changing the kinematic at the tool of a hydraulic excavator

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EP (1) EP1477614A1 (en)
FR (1) FR2854910B1 (en)

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Publication number Priority date Publication date Assignee Title
WO2020234138A1 (en) 2019-05-21 2020-11-26 Cognibotics Ab A multi-backhoe linkage mechanism
US11118324B2 (en) 2019-05-21 2021-09-14 Cognibotics Ab Multi-backhoe linkage mechanism
CN113605473A (en) * 2021-08-20 2021-11-05 东北大学秦皇岛分校 Loader working device for enhancing overturning force of bucket

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US4032025A (en) * 1975-06-20 1977-06-28 Audie B. Tomlinson Backhoe bucket tilt
GB2008378A (en) * 1977-11-22 1979-06-06 Keenan J Mounting implements on tractors
US4958981A (en) * 1988-12-20 1990-09-25 Masatoshi Uchihashi Attachment connector assembly for hydraulic shovel type excavator
EP0438931A1 (en) * 1990-01-26 1991-07-31 Societe En Nom Collectif Morin Freres Device for connecting a bucket, or the like, to the boom end of a loader
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US6439827B1 (en) * 1997-07-08 2002-08-27 J C Bamford Excavators Limited Load handling vehicle

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020234138A1 (en) 2019-05-21 2020-11-26 Cognibotics Ab A multi-backhoe linkage mechanism
US11118324B2 (en) 2019-05-21 2021-09-14 Cognibotics Ab Multi-backhoe linkage mechanism
CN113605473A (en) * 2021-08-20 2021-11-05 东北大学秦皇岛分校 Loader working device for enhancing overturning force of bucket
CN113605473B (en) * 2021-08-20 2022-11-01 东北大学秦皇岛分校 Loader working device for enhancing overturning force of bucket

Also Published As

Publication number Publication date
FR2854910A1 (en) 2004-11-19
FR2854910B1 (en) 2006-05-12

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