EP2828520B1 - Internally drained hydraulic motor - Google Patents

Internally drained hydraulic motor Download PDF

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Publication number
EP2828520B1
EP2828520B1 EP13715290.6A EP13715290A EP2828520B1 EP 2828520 B1 EP2828520 B1 EP 2828520B1 EP 13715290 A EP13715290 A EP 13715290A EP 2828520 B1 EP2828520 B1 EP 2828520B1
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EP
European Patent Office
Prior art keywords
motor
hydraulic motor
port
hydraulic
intermediate pipe
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.)
Not-in-force
Application number
EP13715290.6A
Other languages
German (de)
French (fr)
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EP2828520A1 (en
Inventor
François POREL
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.)
Hydro Leduc SAS
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Hydro Leduc SAS
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Publication of EP2828520A1 publication Critical patent/EP2828520A1/en
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Publication of EP2828520B1 publication Critical patent/EP2828520B1/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/22—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block having two or more sets of cylinders or pistons
    • F04B1/24—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block having two or more sets of cylinders or pistons inclined to the main shaft axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0636—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F03C1/0639—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block having two or more sets of cylinders or pistons
    • F03C1/0642—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block having two or more sets of cylinders or pistons inclined on main shaft axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/08—Distributing valve-gear peculiar thereto
    • F03C1/14—Distributing valve-gear peculiar thereto by driving liquid of engine
    • 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
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/15—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor with special provision for automatic return
    • 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

Definitions

  • the present concerns an improvement made to a hydraulic motor (cf. FR285364 A ).
  • a drainage pipe 98 connects the casing of the hydraulic motor H to the tank 99.
  • the engine must be the driving element of tools that equip sets to be connected to the gear arms.
  • the present invention aims to eliminate this disadvantage.
  • the return pipe of the motor also serves as a drainage pipe, which makes it possible to eliminate the separate drainage pipes usually used.
  • the invention further comprises all or part of the following provisions.
  • the intermediate pipe communicates between the two check valves with an accumulator responsible for absorbing the pressure peaks each time there is a reversal of the direction of the fluid and therefore, the direction of rotation of the hydraulic motor.
  • the casing comprises a yoke on which are arranged the two bidirectional hydraulic ports of the engine.
  • the intermediate pipe and the two non-return valves are arranged in the cylinder head.
  • the bidirectional hydraulic ports comprise orifices formed in the cylinder head.
  • the cylinder head comprises the accumulator responsible for absorbing the pressure peaks connected to the intermediate pipe.
  • the drainage orifice extends through the cylinder head to connect the intermediate pipe to a zone of the housing located behind the ice distribution.
  • the figure 1 represents a hydraulic motor 1 according to the invention which can be arranged in the hydraulic system of the figure 4 in place of the motor H of the figure 4 .
  • the two ducts A and B are connected to each other by an intermediate duct 2, which comprises two flaps non-return 3 and 4, and which is connected to the housing of the hydraulic motor 1 by a pipe 5, arranged between the two valves 3 and 4.
  • the valve 3 When the line A is the supply line and the line B the return line, the valve 3 is kept closed by the high pressure; while the valve 4 is subjected to the pressure back to the tarpaulin.
  • the internal leaks occurring inside the engine 1 are collected by the pipe 5. When the pressure of these internal leaks increases, the liquid in the line 5 opens the valve 4 and joins the return line B to the tank.
  • This arrangement makes it possible to absorb the pressure peaks that may occur during a sudden change in the direction of rotation of the motor, that is to say a sudden reversal of the high pressure and low pressure sides.
  • FIG. 1 illustrates an embodiment of the invention.
  • a housing 10 is disposed a shaft 11 carrying a plate 12 having a plurality of spherical housings 13 in which are arranged the spherical heads 14 of pistons 15, which slide in cylinders 16 formed in a cylinder 17.
  • the barrel 17 is mounted to pivoting on a pivot 19 whose axis is at an angle to the axis of the shaft 1.
  • the rear face of the cylinder 17 rests against a dispensing window 18. This type of hydraulic motor broken axis is known.
  • the yoke 20 of the housing 10 comprises the means described in connection with the figure 1 .
  • Driving A of the figure 1 arrives at the engine through the orifice 21 and the pipe B through the orifice 22 ( figure 3 ).
  • the pipe 23, which corresponds to the pipe 2 of the figure 1 comprises two nonreturn valves 25 and 26, which correspond to the valves 3 and 4 of the figure 1 . Between these two valves 25 and 26 arrives the pipe 27, which corresponds to the pipe 5.
  • a passage 28 ( figure 2 ), corresponding to conduct 6 of the figure 1 communicates the pipe 23 with an accumulator capable of absorbing the pressure peaks at the change of direction of rotation of the hydraulic motor.
  • the accumulator 29 is made by a piston pushed by compression springs but this choice is not limiting. In particular, the accumulator 29 prevents the pressure exceeding the sealing limit of the front seal of the housing 10 during a sudden reversal of the direction of rotation of the motor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Hydraulic Motors (AREA)

Description

La présente concerne un perfectionnement apporté à un moteur hydraulique (cf FR285364 A ).The present concerns an improvement made to a hydraulic motor (cf. FR285364 A ).

Il est connu d'équiper un moteur hydraulique d'un ou deux orifices de drainage au moyen desquels les fuites internes se produisant à l'intérieur dudit moteur sont évacuées à l'extérieur de celui-ci. Cette disposition présente l'inconvénient de nécessiter la mise en place d'une conduite de drainage en plus de la conduite d'alimentation du moteur en liquide sous pression venant de la pompe et de la conduite de retour à la bâche.It is known to equip a hydraulic motor with one or two drainage holes by means of which internal leakage occurring inside said engine are discharged outside thereof. This provision has the disadvantage of requiring the establishment of a drain line in addition to the supply line of the engine in liquid under pressure from the pump and the return line to the tank.

En se reportant à la figure 4, on voit que le moteur d'entrainement M, qui peut être un moteur électrique, un moteur à combustion interne ou autre, entraine une pompe P, dont la sortie haute pression est reliée à un distributeur D, qui permet de réaliser sélectivement plusieurs types de connexions hydrauliques entre la sortie de la pompe P et deux canalisations d'alimentation A et B reliées au moteur hydraulique H. Dans la position neutre représentée, le distributeur D relie les deux canalisations A et B à la bâche 99. Le moteur hydraulique H n'est donc pas alimenté. Les deux autres positions du distributeur D permettent :

  • Soit de relier la conduite A à la pompe P et la conduite B à la bâche 99, pour faire tourner le moteur hydraulique H dans un sens,
  • Soit de relier la conduite A à la bâche 99 et la conduite B à la pompe P, pour faire tourner le moteur hydraulique H dans l'autre sens.
Referring to the figure 4 it can be seen that the drive motor M, which may be an electric motor, an internal combustion engine or the like, drives a pump P whose high pressure output is connected to a distributor D, which makes it possible to selectively produce several types hydraulic connections between the output of the pump P and two supply lines A and B connected to the hydraulic motor H. In the neutral position shown, the distributor D connects the two pipes A and B to the tank 99. The hydraulic motor H is not powered. The other two positions of the distributor D allow:
  • Either connect the pipe A to the pump P and the pipe B to the tank 99, to turn the hydraulic motor H in one direction,
  • Either connect the pipe A to the tank 99 and the pipe B to the pump P, to turn the hydraulic motor H in the other direction.

Une conduite de drainage 98 relie le carter du moteur hydraulique H à la bâche 99. Dans certains cas, en particulier lorsque le moteur doit être l'élément d'entrainement d'outils qui équipent des ensembles à relier sur les bras d'engins de travaux publics, par exemple sur un camion, son emplacement peut rendre très difficile de placer la conduite de drainage 98. Dans cette situation, souvent seules les canalisations A et B sont prévues sur l'engin.A drainage pipe 98 connects the casing of the hydraulic motor H to the tank 99. In some cases, particularly when the engine must be the driving element of tools that equip sets to be connected to the gear arms. public works, for example on a truck, its location can make it very difficult to place the drain line 98. In this situation, often only pipes A and B are provided on the machine.

La présente invention a pour objet de supprimer cet inconvénient.The present invention aims to eliminate this disadvantage.

Selon un mode de réalisation, l'invention fournit un moteur hydraulique pouvant être actionné dans les deux sens, le moteur hydraulique comportant deux ports hydrauliques bidirectionnels pouvant chacun être relié, sélectivement selon le sens de rotation dans lequel le moteur doit être actionné, soit à une source de liquide sous pression pour servir de port d'alimentation du moteur hydraulique, soit à un dispositif de collecte du liquide à une plus basse pression pour servir de port de retour du moteur hydraulique, le moteur hydraulique comportant un orifice de drainage communiquant avec un espace intérieur du carter du moteur, caractérisé par le fait qu'il comporte :

  • une conduite intermédiaire dans laquelle débouche l'orifice de drainage du carter, un premier clapet anti-retour disposé entre la conduite intermédiaire et un premier port hydraulique bidirectionnel et apte à s'ouvrir sous l'effet d'un différentiel de pression positif entre la conduite intermédiaire et le premier port hydraulique bidirectionnel, et
  • un deuxième clapet anti-retour disposé entre la conduite intermédiaire et un deuxième port hydraulique bidirectionnel et apte à s'ouvrir sous l'effet d'un différentiel de pression positif entre la conduite intermédiaire et le deuxième port hydraulique bidirectionnel.
According to one embodiment, the invention provides a hydraulic motor that can be actuated in both directions, the hydraulic motor comprising two bidirectional hydraulic ports each of which can be connected, selectively according to the direction of rotation in which the motor is to be actuated, ie to a source of pressurized liquid to serve as a hydraulic motor supply port, ie at a device for collecting the liquid at a lower pressure to serve as a return port for the hydraulic motor, the hydraulic motor comprising a drainage orifice communicating with an interior space of the motor housing, characterized in that it comprises:
  • an intermediate pipe into which the crankcase drain orifice opens, a first non-return valve disposed between the intermediate pipe and a first bi-directional hydraulic port and able to open under the effect of a positive pressure differential between the intermediate pipe and the first bi-directional hydraulic port, and
  • a second non-return valve disposed between the intermediate pipe and a second bidirectional hydraulic port and able to open under the effect of a positive pressure differential between the intermediate pipe and the second bidirectional hydraulic port.

Un tel agencement permet que le liquide provenant des fuites internes du moteur soit évacué du carter à travers celui des deux clapets anti-retour qui est relié au port de retour du moteur. Ainsi, la conduite de retour du moteur sert aussi de conduite de drainage, ce qui permet de supprimer les conduites de drainage séparées habituellement utilisées.Such an arrangement allows the liquid from internal engine leakage is removed from the housing through that of the two check valves that is connected to the return port of the engine. Thus, the return pipe of the motor also serves as a drainage pipe, which makes it possible to eliminate the separate drainage pipes usually used.

Selon des modes de réalisation, l'invention comprend en outre tout ou partie des dispositions suivantes.According to embodiments, the invention further comprises all or part of the following provisions.

Selon un mode de réalisation, la conduite intermédiaire communique entre les deux clapets anti-retour avec un accumulateur chargé d'absorber les pointes de pression chaque fois qu'il y a inversion du sens du fluide et de ce fait, du sens de rotation du moteur hydraulique.According to one embodiment, the intermediate pipe communicates between the two check valves with an accumulator responsible for absorbing the pressure peaks each time there is a reversal of the direction of the fluid and therefore, the direction of rotation of the hydraulic motor.

Selon un mode de réalisation, le moteur hydraulique comporte en outre un arbre de sortie accessible depuis l'extérieur du carter et, à l'intérieur du carter :

  • un plateau solidaire de l'arbre moteur et comportant une pluralité de logements sphériques,
  • un barillet monté à rotation sur un pivot dont l'axe fait un angle avec l'axe de l'arbre moteur,
  • une pluralité de pistons coulissant dans des alésages cylindriques ménagés axialement dans le barillet, chaque piston comportant une tête sphérique reçue dans un des logements sphériques du plateau, et
  • une glace de distribution contre laquelle repose de manière glissante une face arrière du barillet.
According to one embodiment, the hydraulic motor further comprises an output shaft accessible from outside the housing and, inside the housing:
  • a plate integral with the motor shaft and comprising a plurality of spherical housings,
  • a cylinder mounted to rotate on a pivot whose axis is at an angle with the axis of the motor shaft,
  • a plurality of pistons sliding in cylindrical bores formed axially in the barrel, each piston comprising a spherical head received in one of the spherical housing of the plateau, and
  • a dispensing glass against which slidably rests a rear face of the barrel.

Selon un mode de réalisation, le carter comporte une culasse sur laquelle sont disposés les deux ports hydrauliques bidirectionnels du moteur.According to one embodiment, the casing comprises a yoke on which are arranged the two bidirectional hydraulic ports of the engine.

Selon un mode de réalisation, la conduite intermédiaire et les deux clapets anti-retour sont disposés dans la culasse.According to one embodiment, the intermediate pipe and the two non-return valves are arranged in the cylinder head.

Selon un mode de réalisation, les ports hydrauliques bidirectionnels comportent des orifices ménagés dans la culasse.According to one embodiment, the bidirectional hydraulic ports comprise orifices formed in the cylinder head.

Selon un mode de réalisation, la culasse comporte l'accumulateur chargé d'absorber les pointes de pression relié à la conduite intermédiaire.According to one embodiment, the cylinder head comprises the accumulator responsible for absorbing the pressure peaks connected to the intermediate pipe.

Selon un mode de réalisation, l'orifice de drainage s'étend à travers la culasse pour relier la conduite intermédiaire à une zone du carter située derrière la glace de distribution.According to one embodiment, the drainage orifice extends through the cylinder head to connect the intermediate pipe to a zone of the housing located behind the ice distribution.

L'invention sera mieux comprise, et d'autres buts, détails, caractéristiques et avantages de celle-ci apparaîtront plus clairement au cours de la description suivante d'un mode de réalisation particulier de l'invention, donné uniquement à titre illustratif et non limitatif, en référence aux dessins annexés. Sur ces dessins :

  • La figure 1 est un schéma fonctionnel d'un moteur hydraulique selon un mode de réalisation de l'invention.
  • La figure 2 est une vue en coupe longitudinale d'un exemple de réalisation du moteur hydraulique de la figure 1.
  • La figure 3 est une vue d'un détail, en coupe selon la ligne D-D de la figure 2.
  • La figure 4 est un schéma fonctionnel d'un système hydraulique selon l'état de la technique.
The invention will be better understood, and other objects, details, features and advantages thereof will appear more clearly in the following description of a particular embodiment of the invention, given solely for illustrative purposes and not limiting, with reference to the accompanying drawings. On these drawings:
  • The figure 1 is a block diagram of a hydraulic motor according to one embodiment of the invention.
  • The figure 2 is a longitudinal sectional view of an exemplary embodiment of the hydraulic motor of the figure 1 .
  • The figure 3 is a view of a detail, in section along the line DD of the figure 2 .
  • The figure 4 is a block diagram of a hydraulic system according to the state of the art.

La figure 1 représente un moteur hydraulique 1 selon l'invention qui peut être agencé dans le système hydraulique de la figure 4 en lieu et place du moteur H de la figure 4.The figure 1 represents a hydraulic motor 1 according to the invention which can be arranged in the hydraulic system of the figure 4 in place of the motor H of the figure 4 .

En se reportant à la figure 1, on voit que les deux conduites A et B sont reliées l'une à l'autre par une conduite intermédiaire 2, qui comporte deux clapets anti-retour 3 et 4, et qui est reliée au carter du moteur hydraulique 1 par une conduite 5, disposée entre les deux clapets 3 et 4.Referring to the figure 1 it can be seen that the two ducts A and B are connected to each other by an intermediate duct 2, which comprises two flaps non-return 3 and 4, and which is connected to the housing of the hydraulic motor 1 by a pipe 5, arranged between the two valves 3 and 4.

Le fonctionnement de ce dispositif est le suivant.The operation of this device is as follows.

Lorsque la conduite A est la conduite d'alimentation et la conduite B la conduite de retour, le clapet 3 est maintenu fermé par la haute pression ; tandis que le clapet 4 n'est soumis qu'à la pression de retour à la bâche.When the line A is the supply line and the line B the return line, the valve 3 is kept closed by the high pressure; while the valve 4 is subjected to the pressure back to the tarpaulin.

Les fuites internes se produisant à l'intérieur du moteur 1 sont recueillies par la conduite 5. Lorsque la pression de ces fuites internes augmente, le liquide dans la conduite 5 ouvre le clapet 4 et rejoint la conduite B de retour au réservoir.The internal leaks occurring inside the engine 1 are collected by the pipe 5. When the pressure of these internal leaks increases, the liquid in the line 5 opens the valve 4 and joins the return line B to the tank.

Ainsi il n'est plus nécessaire de prévoir un drainage du moteur 1 par des canalisations extérieures comme c'est le cas actuellement, ce drainage étant réalisé par des moyens internes au moteur 1.Thus it is no longer necessary to provide a drainage of the engine 1 by external pipes as is currently the case, this drainage being achieved by means internal to the engine 1.

De préférence une conduite 6, disposée entre les deux clapets 3 et 4, relie la conduite 2 à un accumulateur 7 capable d'absorber les pointes de pression au changement de sens de rotation du moteur hydraulique. Cette disposition permet d'absorber les pics de pression susceptibles de se produire lors d'un changement brutal du sens de rotation du moteur, c'est-à-dire une inversion brutale des côtés haute pression et basse pression.Preferably a pipe 6, arranged between the two valves 3 and 4, connects the pipe 2 to an accumulator 7 capable of absorbing the pressure peaks at the change of direction of rotation of the hydraulic motor. This arrangement makes it possible to absorb the pressure peaks that may occur during a sudden change in the direction of rotation of the motor, that is to say a sudden reversal of the high pressure and low pressure sides.

Les figures 2 et 3 illustrent un mode de réalisation de l'invention. Dans un carter 10 est disposé un arbre 11 portant un plateau 12 comportant une pluralité de logements sphériques 13 dans lesquels sont disposées les têtes sphériques 14 de pistons 15, qui coulissent dans des cylindres 16 ménagés dans un barillet 17. Le barillet 17 est monté à pivotement sur un pivot 19 dont l'axe fait un angle avec l'axe de l'arbre 1. La face arrière du barillet 17 repose contre une glace de distribution 18. Ce type de moteur hydraulique à axe brisé est connu.The figures 2 and 3 illustrate an embodiment of the invention. In a housing 10 is disposed a shaft 11 carrying a plate 12 having a plurality of spherical housings 13 in which are arranged the spherical heads 14 of pistons 15, which slide in cylinders 16 formed in a cylinder 17. The barrel 17 is mounted to pivoting on a pivot 19 whose axis is at an angle to the axis of the shaft 1. The rear face of the cylinder 17 rests against a dispensing window 18. This type of hydraulic motor broken axis is known.

Selon un mode de réalisation de l'invention la culasse 20 du carter 10 comporte les moyens décrits en liaison avec la figure 1.According to one embodiment of the invention, the yoke 20 of the housing 10 comprises the means described in connection with the figure 1 .

La conduite A de la figure 1 arrive au moteur par l'orifice 21 et la conduite B par l'orifice 22 (figure 3). La conduite 23, qui correspond à la conduite 2 de la figure 1, comporte deux clapets anti-retour 25 et 26, qui correspondent aux clapets 3 et 4 de la figure 1. Entre ces deux clapets 25 et 26 arrive la conduite 27, qui correspond à la conduite 5.Driving A of the figure 1 arrives at the engine through the orifice 21 and the pipe B through the orifice 22 ( figure 3 ). The pipe 23, which corresponds to the pipe 2 of the figure 1 , comprises two nonreturn valves 25 and 26, which correspond to the valves 3 and 4 of the figure 1 . Between these two valves 25 and 26 arrives the pipe 27, which corresponds to the pipe 5.

Un passage 28 (figure 2), correspondant à la conduite 6 de la figure 1 met en communication la conduite 23 avec un accumulateur capable d'absorber les pointes de pression au changement de sens de rotation du moteur hydraulique. L'accumulateur 29 est réalisé par un piston poussé par des ressorts de compression mais ce choix n'est pas limitatif. En particulier, l'accumulateur 29 permet d'éviter que la pression dépasse la limite d'étanchéité du joint frontal du carter 10 lors d'une inversion brutale de sens de rotation du moteur.A passage 28 ( figure 2 ), corresponding to conduct 6 of the figure 1 communicates the pipe 23 with an accumulator capable of absorbing the pressure peaks at the change of direction of rotation of the hydraulic motor. The accumulator 29 is made by a piston pushed by compression springs but this choice is not limiting. In particular, the accumulator 29 prevents the pressure exceeding the sealing limit of the front seal of the housing 10 during a sudden reversal of the direction of rotation of the motor.

Le fonctionnement est celui décrit en liaison avec la figure 1. Lorsque le moteur est alimenté en liquide hydraulique sous pression, il se produit des fuites entre la face arrière du barillet 17 et la glace de distribution 18. Ces fuites produisent une augmentation de la pression du liquide se trouvant dans le volume 30 du carter 10 dans lequel se trouve le barillet 17. Comme la conduite 27 est en communication avec ledit volume 30 du carter 10, cette pression agit sur les deux clapets 25 et 26. Celui des deux clapets 25 et 26 qui correspond à l'orifice d'alimentation du moteur 10 (suivant le sens d'alimentation du moteur) est soumis une haute pression sur sa surface extérieure, de sorte qu'il reste à l'état fermé. Inversement, celui des deux clapets 25 et 26 qui correspond à l'orifice de retour du moteur 10 s'ouvre du fait du différentiel de pression entre la conduite 23 et le circuit basse pression de retour à la bâche. De ce fait, le liquide provenant des fuites internes du moteur est évacué par celle des deux conduites A et B qui est reliée à la bâche.The operation is that described in connection with the figure 1 . When the engine is supplied with hydraulic fluid under pressure, leakage occurs between the rear face of the barrel 17 and the dispensing window 18. These leaks produce an increase in the pressure of the liquid in the volume of the casing 10 which is the cylinder 17. As the pipe 27 is in communication with said volume 30 of the housing 10, this pressure acts on the two valves 25 and 26. That of the two valves 25 and 26 which corresponds to the supply port of the motor 10 (according to the motor supply direction) is subjected to a high pressure on its outer surface, so that it remains in the closed state. Conversely, that of the two valves 25 and 26 which corresponds to the return port of the engine 10 opens because of the pressure differential between the pipe 23 and the low pressure return circuit to the tank. As a result, the liquid coming from the internal leakage of the engine is evacuated by that of the two lines A and B which is connected to the tank.

Bien que l'invention ait été décrite en liaison avec un seul mode de réalisation particulier, il est bien évident qu'elle n'y est nullement limitée et qu'elle comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci entrent dans le cadre de l'invention.Although the invention has been described in connection with a single particular embodiment, it is obvious that it is not limited thereto and that it includes all the technical equivalents of the means described and their combinations if they These are within the scope of the invention.

L'usage du verbe « comporter », « comprendre » ou « inclure » et de ses formes conjuguées n'exclut pas la présence d'autres éléments ou d'autres étapes que ceux énoncés dans une revendication. L'usage de l'article indéfini « un » pour un élément n'exclut pas, sauf mention contraire, la présence d'une pluralité de tels éléments.The use of the verb "to include", "to understand" or "to include" and its conjugated forms does not exclude the presence of other elements or steps other than those set out in a claim. The use of the indefinite article "a" for an element does not exclude, unless otherwise stated, the presence of a plurality of such elements.

Dans les revendications, tout signe de référence entre parenthèses ne saurait être interprété comme une limitation de la revendication.In the claims, any reference sign in parentheses can not be interpreted as a limitation of the claim.

Claims (8)

  1. A hydraulic motor (1; 10) that can be operated in both directions, the hydraulic motor comprising two two-way hydraulic ports (A, B; 21, 22) each of which can be connected, selectively depending on the direction of rotation in which the motor is to be actuated, either to a source of pressurized liquid in order to act as a feed port for the hydraulic motor, or to a device for collecting the liquid at a lower pressure in order to act as a hydraulic motor return port, the hydraulic motor comprising a drain port (5; 27) communicating with an interior space (30) of the motor case, characterized in that it comprises: an intermediate pipe (2; 23) into which the drain port (5; 27) of the case opens,
    a first nonreturn valve (3; 25) positioned between the intermediate pipe (2; 23) and a first two-way hydraulic port (A; 21) and able to open under the effect of a positive pressure differential between the intermediate pipe and the first two-way hydraulic port; and
    a second nonreturn valve (4; 26) positioned between the intermediate pipe (2; 23) and a second two-way hydraulic port (B; 22) and able to open under the effect of a positive pressure differential between the intermediate pipe and the second two-way hydraulic port.
  2. The motor as claimed in claim 1, in which the intermediate pipe (2; 23) communicates between the two nonreturn valves (3, 4; 25, 26) with a pressure accumulator (7; 29).
  3. The hydraulic motor as claimed in claim 1, further comprising an output shaft (11) accessible from outside the case and, inside the case:
    a plate (12) secured to the motor shaft (11) and comprising a plurality of spherical housings (13), a barrel (17) mounted so as to be able to rotate on a pivot (19) the axis of which makes an angle with the axis of the motor shaft (11),
    a plurality of pistons (15) sliding in cylindrical bores (16) formed axially in the barrel (17), each piston having a spherical head (14) housed in one of the spherical housings (13) of the plate (12), and
    a port plate (18) against which a rear face of the barrel (17) rests slidingly.
  4. The hydraulic motor as claimed in claim 3, characterized in that the case comprises a cylinder block (20) on which the two two-way hydraulic ports (21, 22) of the motor are positioned.
  5. The hydraulic motor as claimed in claim 4, in which the intermediate pipe (23) and the two nonreturn valves (25, 26) are positioned in the cylinder block (20).
  6. The hydraulic motor as claimed in claim 4 or 5, characterized in that the two-way hydraulic ports comprise ports (21, 22) formed in the cylinder block (20).
  7. The hydraulic motor as claimed in one of claims 4 to 6, in which the cylinder block (20) comprises an accumulator (29) capable of absorbing pressure spikes when the direction of rotation of the motor reverses, the accumulator being connected to the intermediate pipe (23).
  8. The hydraulic motor as claimed in one of claims 4 to 7, in which the drain port (27) extends through the cylinder block (20) to connect the intermediate pipe (23) to a region of the case that is situated behind the port plate (18).
EP13715290.6A 2012-03-19 2013-03-08 Internally drained hydraulic motor Not-in-force EP2828520B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1252426A FR2988143B1 (en) 2012-03-19 2012-03-19 HYDRAULIC MOTOR WITH INTERNAL DRAINAGE
PCT/FR2013/050499 WO2013140064A1 (en) 2012-03-19 2013-03-08 Internally drained hydraulic motor

Publications (2)

Publication Number Publication Date
EP2828520A1 EP2828520A1 (en) 2015-01-28
EP2828520B1 true EP2828520B1 (en) 2016-03-02

Family

ID=48083470

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13715290.6A Not-in-force EP2828520B1 (en) 2012-03-19 2013-03-08 Internally drained hydraulic motor

Country Status (4)

Country Link
US (1) US20150059326A1 (en)
EP (1) EP2828520B1 (en)
FR (1) FR2988143B1 (en)
WO (1) WO2013140064A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3012181A1 (en) 2013-10-22 2015-04-24 Hydro Leduc HYDRAULIC PISTON PUMP WITH BI-DIRECTIONAL ICE DISTRIBUTION

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2504987B1 (en) * 1981-05-04 1986-04-18 Poclain Hydraulics Sa PRESSURE FLUID MECHANISM COMPRISING REACTION ROLLERS CARRIED BY PISTONS
KR900003793B1 (en) * 1986-08-25 1990-05-31 가부시키가이샤 히타치세이사쿠쇼 Thrust hydrostatic bearing device for use in axial piston machine
JP2000199479A (en) * 1998-10-30 2000-07-18 Toyota Autom Loom Works Ltd Variable capacity compressor
DE10210877A1 (en) * 2002-03-12 2003-11-27 Wabco Gmbh & Co Ohg Valve device for actuating cylinders
FI118233B (en) * 2003-04-01 2007-08-31 Sampo Hydraulics Oy Radial piston hydraulic motor and method for adjusting radial piston hydraulic motor
JP4365870B2 (en) * 2007-03-30 2009-11-18 三菱重工業株式会社 Fluid pressure actuator

Also Published As

Publication number Publication date
WO2013140064A1 (en) 2013-09-26
EP2828520A1 (en) 2015-01-28
FR2988143A1 (en) 2013-09-20
US20150059326A1 (en) 2015-03-05
FR2988143B1 (en) 2014-04-11

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