EP2679818B1 - Hydraulic pump with axial pistons which can operate in both directions of rotation - Google Patents

Hydraulic pump with axial pistons which can operate in both directions of rotation Download PDF

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Publication number
EP2679818B1
EP2679818B1 EP13172383.5A EP13172383A EP2679818B1 EP 2679818 B1 EP2679818 B1 EP 2679818B1 EP 13172383 A EP13172383 A EP 13172383A EP 2679818 B1 EP2679818 B1 EP 2679818B1
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EP
European Patent Office
Prior art keywords
hydraulic pump
pistons
pump
valve plate
barrel
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
EP13172383.5A
Other languages
German (de)
French (fr)
Other versions
EP2679818A1 (en
Inventor
Louis-Claude 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 date
Application filed by Hydro Leduc SAS filed Critical Hydro Leduc SAS
Publication of EP2679818A1 publication Critical patent/EP2679818A1/en
Application granted granted Critical
Publication of EP2679818B1 publication Critical patent/EP2679818B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F04B1/2007—Arrangements for pressing the cylinder barrel against the valve plate, e.g. by fluid pressure
    • 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
    • F04B1/2014—Details or component parts
    • F04B1/2021—Details or component parts characterised by the contact area between cylinder barrel and valve plate
    • 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
    • F04B1/2014—Details or component parts
    • F04B1/2035—Cylinder barrels
    • 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
    • F04B1/2014—Details or component parts
    • F04B1/2042—Valves

Definitions

  • the present invention relates to a hydraulic pump with axial pistons, in particular of low or very low displacement, which can operate in both directions of rotation so as to actuate a hydraulic receiver in one direction or the other.
  • Hydraulic pumps inclined plate, or bias plate, operating axial pistons have been known for a long time.
  • EP 2177759 A1 is considered as the document describing the state of the prior art closest.
  • the object of the present invention is to provide a solution to this problem.
  • This solution consists of a hydraulic pump with bias plate which can rotate in both directions, of the type comprising a rotating barrel bearing pistons, said barrel being applied by a spring against a dispensing window provided with two symmetrical and opposite bores, characterized in that the dispensing window, provided with two symmetrical and opposite bores, the one connected to one of the two outlets of the pump, the other connected to the other outlet, is secured to a double piston with two sections of equal areas, one of these surfaces being in communication with one of the outlet orifices of the pump, the other surface being in communication with the other outlet; so that said ice is always applied against the barrel carrying the pistons by the discharge pressure irrespective of the direction of rotation of the pump, which makes it possible to produce a pump of small cubic capacity (in particular less than 4 to 5 cm 3 ), in which said symmetrical holes of the ice are of small dimensions, without the discharge pressure being able to separate the barrel from the ice.
  • a hydraulic pump with bias plate which can rotate in both directions, of the type comprising
  • the spherical heads of the pistons are held in abutment against the inclined face of the plate biased by the pump by a disk subjected to the action of the spring, which applies the barrel against the dispensing ice.
  • the figure 1 represents a known pump comprising a shaft 1, which drives a cylinder 2, inside which hollow pistons 3 slide, bearing against an inclined plate, or bias plate 4, by means of sliding pads 5.
  • the rear face of the barrel 2 is held in abutment by a spring 9 against a disk 8 which has two arcuate bores 7/7 'of symmetrical shapes, hereinafter called lunules.
  • the liquid is sucked by one of the two holes and pushed back by the other.
  • a groove 17 etched in the surface of the disk 8 makes it possible to communicate each lunule 7, 7 'with the internal space 18 of the pump casing.
  • the orifice 10 of the pump is the intake port when the pump rotates clockwise, the orifice 11 being the delivery port and vice versa when the pump rotates in the opposite direction clockwise.
  • each lunule 7/7 ' can be schematically divided into three zones: a central zone 7a, an outer zone 7c and an intermediate zone 7b.
  • zone 7a prevails the pressure P of discharge, in the zone 7c the pressure is null, or equal to that which reigns in the casing of the pump. In zone 7b there is a pressure varying from the pressure P to 0 or that of the pump casing.
  • the diameter of the pistons is of the order of 6 to 8 mm.
  • FIG 4 illustrates what to get.
  • the inventor has created two artificial surfaces constituted by the double piston 81/82 which pushes on the dispensing ice 80. This artificial thrust is balanced thanks to an increased surface of the lunulae 70 and 70 '.
  • the figure 3 illustrates an example of the pump according to the invention.
  • the cylinder 20 carrying the pistons 30 is integral with the drive shaft 10.
  • the pistons 30 are supported on a bias plate 40 by means of the sliding pads 50.
  • spring 90 maintains firstly the heads of the pistons 30 against the pads 50 by means of the disc 91 and secondly the rear face 21 of the barrel 20 against the dispensing window 80, which comprises two circular machining 70/70 'symmetrical .
  • the dispensing glass 80 is carried by a double stepped piston whose two sections 81 and 82 have equal surfaces on the opposite side to the circular machining 70 and 70 ', designated S1 and S2.
  • the piston 82 slides in a cylindrical chamber 31 which is connected to the circular machining 70 by the pipe 84, while the piston 81 slides in a cylindrical chamber 32 which is connected to the circular machining 70 'through the pipe 83.
  • chamber 31 in which the piston 81 slides is connected to the orifice 11; while the chamber 32 in which the piston 82 slides is connected to the orifice 10.
  • the ice 80 is applied against the rear face 21 of the cylinder 20 by the piston 82 actuated by said pressure of discharge.
  • the pressurized liquid is discharged by the circular machining 70 'and the orifice 11
  • the ice 80 is then applied against the rear face 21 of the barrel 20 by the piston 81 actuated by the discharge pressure.

Description

La présente invention est relative à une pompe hydraulique à pistons axiaux, notamment de faible ou très faible cylindrée, pouvant fonctionner dans les deux sens de rotation de façon à pouvoir actionner un récepteur hydraulique dans un sens ou dans l'autre.The present invention relates to a hydraulic pump with axial pistons, in particular of low or very low displacement, which can operate in both directions of rotation so as to actuate a hydraulic receiver in one direction or the other.

Il s'avère nécessaire de pouvoir actionner, par exemple dans un tube de forage pétrolier, un vérin hydraulique à double effet et cela sans avoir à disposer un distributeur dans le circuit hydraulique et/ou tout en logeant la pompe dans un volume très faible.It is necessary to be able to actuate, for example in a petroleum drill pipe, a double-acting hydraulic cylinder and this without having to have a distributor in the hydraulic circuit and / or while housing the pump in a very small volume.

Pour cela, il est avantageux d'employer la technologie des pompes à plateau biais et pistons axiaux.For this, it is advantageous to use the technology of bias plate pumps and axial pistons.

Les pompes hydrauliques à plateau incliné, ou plateau biais, actionnant des pistons axiaux sont connues depuis fort longtemps.Hydraulic pumps inclined plate, or bias plate, operating axial pistons have been known for a long time.

En particulier il est connu d'employer des pistons creux, qui prennent appui sur un plateau biais par l'intermédiaire de patins de glissement au travers desquels chaque piston est alimenté en liquide , lorsque son patin de glissement passe sur un sillon arqué, appelé lunule, gravé sur la face du plateau biais ; le refoulement du liquide ainsi aspiré à l'intérieur du piston creux se faisant par un clapet anti-retour disposé à l'extrémité du cylindre dans lequel coulisse le piston.In particular it is known to use hollow pistons, which are supported on a bias plate by means of sliding pads through which each piston is supplied with liquid, when its sliding pad passes over an arcuate groove, called a lunula engraved on the side of the bias plate; the discharge of the liquid thus sucked into the hollow piston is by a non-return valve disposed at the end of the cylinder in which the piston slides.

Il est connu d'employer pour ce genre de pompe ce que l'on appelle une distribution par glace, les pistons étant portés par un barillet entrainé en rotation, la face arrière dudit barillet étant appliquée par un ressort contre une glace, constituée par un disque muni de perçages arqués.It is known to use for this type of pump what is called an ice distribution, the pistons being carried by a cylinder rotated, the rear face of said cylinder being applied by a spring against an ice, constituted by a disc with bowed holes.

EP 2177759 A1 est considéré comme le document décrivant l'état de la technique antérieure le plus proche. EP 2177759 A1 is considered as the document describing the state of the prior art closest.

Il s'avère cependant que cette technique, largement utilisée par le demandeur n'est pas utilisable pour des pompes de cylindrée inférieure à 4 à 5 cm3, parce que, dans ce cas, pour éviter que la pression de refoulement ne sépare la face arrière du barillet de la glace de distribution, il faut donner auxdites lunules une section tellement faible qu'il est, dans la pratique, impossible de les usiner. De plus, la très petite taille des lunules condamne la pompe à avoir une aspiration très réduite, ce qui n'est pas forcément compatible avec l'application souhaitée de la pompe.However, it turns out that this technique, widely used by the applicant is not usable for pumps of cubic capacity less than 4 to 5 cm 3 , because, in this case, to prevent the discharge pressure does not separate the face rear of the barrel of the dispensing ice, it is necessary to give said lunules a section so small that it is, in practice, impossible to machine them. In addition, the very small size of the loops condemns the pump to have a very low suction, which is not necessarily compatible with the desired application of the pump.

La présente invention a pour objet d'apporter une solution à ce problème.The object of the present invention is to provide a solution to this problem.

Cette solution consiste en une pompe hydraulique à plateau biais pouvant tourner dans les deux sens, du type comportant un barillet tournant portant des pistons, ledit barillet étant appliqué par un ressort contre une glace de distribution munie de deux perçages symétriques et opposés, caractérisée par le fait que la glace de distribution, munie de deux perçages symétriques et opposés, l'un relié à l'un des deux orifices de sortie de la pompe, l'autre relié à l'autre orifice de sortie, est solidaire d'un piston double à deux sections de surfaces égales, l'une de ces surfaces étant en communication avec un des orifices de sortie de la pompe, l'autre surface étant en communication avec l'autre orifice de sortie ; de telle sorte que ladite glace soit toujours appliquée contre le barillet portant les pistons par la pression de refoulement quel que soit le sens de rotation de la pompe, ce qui permet de réaliser une pompe de faible cylindrée (notamment inférieure à 4 à 5 cm3), dans laquelle lesdits perçages symétriques de la glace sont de faibles dimensions, sans que la pression de refoulement ne puisse séparer le barillet de la glace.This solution consists of a hydraulic pump with bias plate which can rotate in both directions, of the type comprising a rotating barrel bearing pistons, said barrel being applied by a spring against a dispensing window provided with two symmetrical and opposite bores, characterized in that the dispensing window, provided with two symmetrical and opposite bores, the one connected to one of the two outlets of the pump, the other connected to the other outlet, is secured to a double piston with two sections of equal areas, one of these surfaces being in communication with one of the outlet orifices of the pump, the other surface being in communication with the other outlet; so that said ice is always applied against the barrel carrying the pistons by the discharge pressure irrespective of the direction of rotation of the pump, which makes it possible to produce a pump of small cubic capacity (in particular less than 4 to 5 cm 3 ), in which said symmetrical holes of the ice are of small dimensions, without the discharge pressure being able to separate the barrel from the ice.

De préférence les têtes sphériques des pistons sont maintenues en appui contre la face inclinée du plateau biais de la pompe par un disque soumis à l'action du ressort, qui applique le barillet contre la glace de distribution.Preferably the spherical heads of the pistons are held in abutment against the inclined face of the plate biased by the pump by a disk subjected to the action of the spring, which applies the barrel against the dispensing ice.

Afin de faciliter la compréhension de la présente invention on a représenté aux dessins annexés :

  • Figure 1 une vue en coupe longitudinale d'une pompe connue à plateau biais et à glace de distribution.
  • Figure 2 une vue en plan de la glace de distribution de la figure 1 avec ses deux lunules symétriques à une échelle légèrement plus grande.
  • Figure 3 une vue en coupe longitudinale d'un exemple de réalisation d'une pompe d'une cylindrée par exemple inférieure à 4 à 5 cm3 pouvant débiter dans les deux sens.
  • Figure 4 une vue en plan de la glace de distribution avec ses deux lunules dimensionnées dans le cas où la cylindrée d'une pompe du type connu devrait être inférieure à 4 à 5 cm3.
In order to facilitate the understanding of the present invention, the attached drawings show:
  • Figure 1 a longitudinal sectional view of a known bias plateau and ice distribution pump.
  • Figure 2 a plan view of the distribution ice of the figure 1 with its two symmetrical lunules on a slightly larger scale.
  • Figure 3 a longitudinal sectional view of an exemplary embodiment of a pump of a cylinder capacity for example less than 4 to 5 cm 3 can flow in both directions.
  • Figure 4 a plan view of the dispensing ice with its two sized lunettes in the case where the displacement of a pump of known type should be less than 4 to 5 cm 3 .

La figure 1 représente une pompe connue comportant un arbre 1, qui entraîne un barillet 2, à l'intérieur duquel coulissent des pistons creux 3, prenant appui contre un plateau incliné, ou plateau biais 4, par l'intermédiaire de patins de glissement 5.The figure 1 represents a known pump comprising a shaft 1, which drives a cylinder 2, inside which hollow pistons 3 slide, bearing against an inclined plate, or bias plate 4, by means of sliding pads 5.

La face arrière du barillet 2 est maintenue en appui par un ressort 9 contre un disque 8 qui comporte deux perçages arqués 7/7' de formes symétriques, appelés ci-après lunules.The rear face of the barrel 2 is held in abutment by a spring 9 against a disk 8 which has two arcuate bores 7/7 'of symmetrical shapes, hereinafter called lunules.

Le liquide est aspiré par l'un des deux perçages et refoulé par l'autre.The liquid is sucked by one of the two holes and pushed back by the other.

Une rainure 17 gravée dans la surface du disque 8 permet de faire communiquer chaque lunule 7, 7' avec l'espace intérieur 18 du carter de pompe.A groove 17 etched in the surface of the disk 8 makes it possible to communicate each lunule 7, 7 'with the internal space 18 of the pump casing.

L'orifice 10 de la pompe est l'orifice d'admission lorsque la pompe tourne dans le sens horaire, l'orifice 11 étant l'orifice de refoulement et inversement lorsque que la pompe tourne dans le sens inverse horaire.The orifice 10 of the pump is the intake port when the pump rotates clockwise, the orifice 11 being the delivery port and vice versa when the pump rotates in the opposite direction clockwise.

Cette disposition est connue.This provision is known.

Il est connu qu'il faut équilibrer hydrostatiquement la pompe afin d'éviter que la pression de refoulement, qui s'insinue entre la face arrière du barillet 2 et le disque 8 ne les sépare.It is known that it is necessary to balance the pump hydrostatically to prevent the discharge pressure, which creeps between the rear face of the barrel 2 and the disc 8 separates them.

En se reportant à la figure 2 on voit que l'espace intérieur de chaque lunule 7/7' peut être schématiquement divisé en trois zones : une zone centrale 7a, une zone extérieure 7c et une zone intermédiaire 7b.Referring to the figure 2 it can be seen that the interior space of each lunule 7/7 'can be schematically divided into three zones: a central zone 7a, an outer zone 7c and an intermediate zone 7b.

Dans la zone 7a règne la pression P de refoulement, dans la zone 7c la pression est nulle, ou égale à celle qui règne dans le carter de la pompe. Dans la zone 7b règne une pression variant de la pression P à 0 ou à celle du carter de la pompe.In the zone 7a prevails the pressure P of discharge, in the zone 7c the pressure is null, or equal to that which reigns in the casing of the pump. In zone 7b there is a pressure varying from the pressure P to 0 or that of the pump casing.

Si l'on désigne par S la section de la zone 7a ; dS la section de la zone 7b, appelée section d'appui ; s la section des pistons et n le nombre de pistons en pression, il faut appliquer la formule suivante : P x (S+dS) inférieur à P x s x n.If S denotes the section of zone 7a; dS the section of zone 7b, called the support section; s the piston section and n the number of pistons under pressure, the following formula must be applied: P x (S + dS) less than P x s x n.

Pour les cylindrées inférieures à environ 4 à 5 cm3, le diamètre des pistons est de l'ordre de 6 à 8 mm.For displacements of less than about 4 to 5 cm 3 , the diameter of the pistons is of the order of 6 to 8 mm.

Si l'on applique la formule ci-dessus pour calculer les sections S et dS on arrive à des sections très faibles. La figure 4 illustre ce qu'il faut obtenir. Pour l'obtenir, l'inventeur a créé deux surfaces artificielles constituées par le piston double 81/82 qui pousse sur la glace de distribution 80. Cette poussée artificielle est équilibrée grâce à une surface augmentée des lunules 70 et 70'.If one applies the formula above to calculate the sections S and dS one arrives at very weak sections. The figure 4 illustrates what to get. To obtain it, the inventor has created two artificial surfaces constituted by the double piston 81/82 which pushes on the dispensing ice 80. This artificial thrust is balanced thanks to an increased surface of the lunulae 70 and 70 '.

La figure 3 illustre un exemple de la pompe selon l'invention. Le barillet 20 portant les pistons 30 est solidaire de l'arbre d'entrainement 10. Les pistons 30 sont en appui sur un plateau biais 40 par l'intermédiaire des patins de glissement 50. Le ressort 90 maintient d'une part les têtes des pistons 30 contre les patins 50 au moyen du disque 91 et d'autre part la face arrière 21 du barillet 20 contre la glace de distribution 80, qui comporte deux usinages circulaires 70/70' symétriques.The figure 3 illustrates an example of the pump according to the invention. The cylinder 20 carrying the pistons 30 is integral with the drive shaft 10. The pistons 30 are supported on a bias plate 40 by means of the sliding pads 50. spring 90 maintains firstly the heads of the pistons 30 against the pads 50 by means of the disc 91 and secondly the rear face 21 of the barrel 20 against the dispensing window 80, which comprises two circular machining 70/70 'symmetrical .

La glace de distribution 80 est portée par un double piston étagé dont les deux sections 81 et 82 ont des surfaces égales du côté opposé aux usinages circulaires 70 et 70', désignées par S1 et S2. Le piston 82 coulisse dans une chambre cylindrique 31 qui est reliée à l'usinage circulaire 70 par la canalisation 84, tandis que le piston 81 coulisse dans une chambre cylindrique 32 qui est reliée à l'usinage circulaire 70' par la canalisation 83. La chambre 31 dans laquelle coulisse le piston 81 est reliée à l'orifice 11 ; tandis que la chambre 32 dans laquelle coulisse le piston 82 est reliée à l'orifice 10.The dispensing glass 80 is carried by a double stepped piston whose two sections 81 and 82 have equal surfaces on the opposite side to the circular machining 70 and 70 ', designated S1 and S2. The piston 82 slides in a cylindrical chamber 31 which is connected to the circular machining 70 by the pipe 84, while the piston 81 slides in a cylindrical chamber 32 which is connected to the circular machining 70 'through the pipe 83. chamber 31 in which the piston 81 slides is connected to the orifice 11; while the chamber 32 in which the piston 82 slides is connected to the orifice 10.

Ainsi lorsque la pompe tourne dans un sens pour lequel le liquide sous pression est refoulé par l'usinage circulaire 70 et l'orifice 10, la glace 80 est appliquée contre la face arrière 21 du barillet 20 par le piston 82 actionné par ladite pression de refoulement. Lorsque la pompe tourne dans l'autre sens, le liquide sous pression est refoulé par l'usinage circulaire 70' et l'orifice 11, la glace 80 est alors appliquée contre la face arrière 21 du barillet 20 par le piston 81 actionné par la pression de refoulement.Thus when the pump rotates in a direction for which the pressurized liquid is discharged by the circular machining 70 and the orifice 10, the ice 80 is applied against the rear face 21 of the cylinder 20 by the piston 82 actuated by said pressure of discharge. When the pump rotates in the other direction, the pressurized liquid is discharged by the circular machining 70 'and the orifice 11, the ice 80 is then applied against the rear face 21 of the barrel 20 by the piston 81 actuated by the discharge pressure.

Grace à ces dispositions, il est possible d'utiliser des usinages circulaires 70 et 70' de relativement grande section, ce qui évite de devoir usiner une glace de distribution telle que représentée sur la figure 4.Thanks to these provisions, it is possible to use circular machining 70 and 70 'of relatively large section, which avoids having to machine a dispensing ice as shown in the figure 4 .

Bien que l'invention ait été décrite en liaison avec un 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 particular embodiment, it is obvious that it is not limited thereto and that it comprises all the technical equivalents of the means described and their combinations if they 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 (5)

  1. An hydraulic pump able to function in one or the other rotating direction of the type comprising a rotating barrel bearing pistons applied against a valve plate provided with two symmetrical opposed drillings wherein said valve plate (80) provided with two symmetrical and opposed drillings (70,70'), one connected to one of the output openings (10) of the pump, the other one connected to the other output opening (11) is jointly linked to a double piston having two sections (81,82) of equal surfaces, one of these surfaces being connected with one of the two output openings (10), the other one being connected with the other output opening (11) so that the valve plate (80)is always applied against the rotating barrel (20) bearing the pistons (30) by the discharge pressure in any rotating direction of the pump.
  2. An hydraulic pump according to claim 1 wherein the spherical heads of the pistons (30) are maintained applied against the inclined plane of the swash plate (40) by means of a disc (91) pressed by a spring (90) which is applying said barrel (20) against said valve plate (80).
  3. An hydraulic pump according to claim 2 wherein said spring (90) is maintaining a back side of the barrel (20) against the valve plate (80).
  4. An hydraulic pump according to any one of claims 1 to 3 wherein said valve plate (80) is provided with two symmetrical drillings (70,70').
  5. An hydraulic pump according to any one of claims 1 to 4 wherein the cubic displacement of the pump is lower than 5 cm3.
EP13172383.5A 2012-06-28 2013-06-18 Hydraulic pump with axial pistons which can operate in both directions of rotation Not-in-force EP2679818B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1256159A FR2992691B1 (en) 2012-06-28 2012-06-28 HYDRAULIC PUMP WITH AXIAL PISTONS OPERATING IN TWO DIRECTION OF ROTATION

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EP2679818A1 EP2679818A1 (en) 2014-01-01
EP2679818B1 true EP2679818B1 (en) 2014-12-24

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EP (1) EP2679818B1 (en)
FR (1) FR2992691B1 (en)

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GB201609351D0 (en) * 2016-05-26 2016-07-13 Rolls Royce Controls & Data Services Ltd Axial piston pump/motor
CN112539147A (en) * 2020-12-07 2021-03-23 中船重工重庆液压机电有限公司 Integrated valve plate and micropump

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US20140003970A1 (en) 2014-01-02
EP2679818A1 (en) 2014-01-01
FR2992691B1 (en) 2014-07-18
FR2992691A1 (en) 2014-01-03

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