EP2669516B1 - Hydraulic pump with axial pistons - Google Patents

Hydraulic pump with axial pistons Download PDF

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Publication number
EP2669516B1
EP2669516B1 EP13169420.0A EP13169420A EP2669516B1 EP 2669516 B1 EP2669516 B1 EP 2669516B1 EP 13169420 A EP13169420 A EP 13169420A EP 2669516 B1 EP2669516 B1 EP 2669516B1
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EP
European Patent Office
Prior art keywords
section
pump
face
distribution member
contour
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EP13169420.0A
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German (de)
French (fr)
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EP2669516A1 (en
Inventor
Ludovic Leglize
Thierry Caule
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Safran Landing Systems SAS
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Safran Landing Systems SAS
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    • 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
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B27/00—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders
    • F04B27/08—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis
    • F04B27/0804—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B27/0821—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block component parts, details, e.g. valves, sealings, lubrication
    • F04B27/0839—Multi-cylinder pumps specially adapted for elastic fluids and characterised by number or arrangement of cylinders having cylinders coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block component parts, details, e.g. valves, sealings, lubrication valve means, e.g. 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/10—Adaptations or arrangements of distribution members
    • F04B39/1066—Valve plates

Definitions

  • the invention relates to a hydraulic pump with axial pistons comprising a rotary barrel having an end face cooperating with a dispensing ice.
  • a hydraulic pump is disclosed for example in the document US Patent 5,182,978 .
  • the object of the invention is to propose modifications of limited size to be made to pumps, so as to allow in particular the adaptation of an aluminum body.
  • an axial piston hydraulic pump comprising a rotary barrel having an end face which cooperates with a dispensing window having two diametrically opposite through recesses which are respectively connected to a suction port and to a suction port. a discharge port of the pump, the barrel having a plurality of axial bores opening on the end face and in which pistons are slidably mounted, the axial bores being in communication alternately with the suction and discharge ports through the recesses; through the distribution ice.
  • the through recesses each have a variable current section between a first section delimited by a first contour at a first face of the ice facing the barrel, and a second section delimited by a second contour of distinct shape.
  • the first contour at a second face of the dispensing glass opposite the first face characterized in that a body of the pump is made of aluminum, in that the dispensing glass is made of steel, and in that the running sections of each through recess have substantially constant surfaces.
  • a second section whose contour is of lesser curvature than that of the first section (whose shape is in beans)
  • the constraints imposed by the fluid on the body after its passage through the body are reduced. of the through recesses.
  • the stresses are transferred from the pump body to the dispensing ice. This transfer of stress makes it possible, by using a light material to make the body, aluminum for example, and a heavier and more robust material for making ice, for example steel, to obtain a relatively light pump. and having a very good mechanical strength.
  • the pump of the invention finds a particularly advantageous application in aircraft hydraulic circuits in which the pressures are commonly several hundred bars. It may for example equip an aerodynamic surface actuator, or a landing gear actuator.
  • the pump 1 comprises a pump body 2 composed of a first part 2a and a second part 2b accommodating the constituent elements of the pump 1.
  • the first part 2a of the pump body receives a dispensing glass 3 cooperating with a cylinder 4 by pressing a bearing surface 5 of the dispensing window 3 against an end face 6 of the cylinder 4, these faces being perpendicular to an axis of revolution X of the cylinder 4.
  • the cylinder 4 comprises a series of axial bores 7 (ie extending parallel to the axis of revolution X barrel) in order to serve as guides to sliding pistons 8.
  • a conduit 9 communicates the bearing surface 5 of the ice 3 with the interior of the volume of the delimited cylindrical space by each piercing 7 and the associated piston 8.
  • a driver 10 surrounding the barrel 4 is rotatably mounted.
  • the trainer 10 is composed of a cylindrical portion 11 accommodating the barrel 4, a transverse wall 12 forming a support for a spring 13 pressing the barrel 4 against the dispensing window 3, and a bevel gear 14.
  • the driver 10 is rotatably mounted on the first portion 2a of the body 2 to the rolling means 15 allowing the free rotation of the driver 10 along an axis coincident with the axis of revolution X of the cylinder 4.
  • the bevel gear 14 is intended to cooperate with a counterpart gear 16 arranged on a drive shaft 17 rotatably mounted by means of bearings 18 on the second portion 2b of the body 2, and disposed along an axis Y which is concurrent with the axis X.
  • Housings 19 are arranged axially on one face of the drive shaft 17 forming a plate 20 facing the driver 10. These housings 19 each comprise a cylindrical portion 21 threading into a bore 22 associated formed on the face of the drive shaft 17, and each have a spherical receptacle 40 swiveling the spherical end 23 of an associated rod 24, the other end also spherical 25 is rotated on the corresponding piston.
  • the bore 22 is made substantially opposite the trace of the axis of the piston on a plane normal to the Y axis passing through the center of the receptacles 40 of the housings 19.
  • the housings 19 are connected to the plate 20 by a circular flange 24 reported, common to all housing, by means of a central screw 27.
  • the pistons 8 In their relative movement relative to the cylinder 4, the pistons 8 have a displacement 7.
  • the ducts 9 located at the end of the bores 7 move opposite two through recesses 28 of the dispensing window 3.
  • One of these recesses 28 communicates with a suction port 29 of the pump 1, the other to a discharge port 30 of the pump 1.
  • the hydraulic fluid is sucked and discharged by the pump 1 by the action of the pistons 8, via the conduits 9, the through recesses 28, and the suction orifices 29 and discharge 30.
  • the diametrically opposed transverse recesses 28 on the distribution window 3 each have a variable section between a first section 31 delimited by a first contour 32 at the bearing surface 5 of the ice 3, and a second section 33 delimited by a second contour 34 at a second face 35 of the distribution window 3 facing the suction orifices 29 and discharge 30.
  • Each of the sections 31, 33 has a generally oblong curved shape extending over the almost all of a semicircle surrounding the centers of the faces of the ice.
  • the second section 33 has a broader shape, less long and less curved contour than that of the first section 31. Despite this difference in shape, the first and second section have a surface substantially equal.
  • each of the through recesses 28 has a substantially constant surface cross section, from a first section of narrower and longer shape, to a second section wider and shorter.
  • This particular form of the through recesses 28 makes it possible to transfer mechanical stresses from the body 2 of the pump 1 to the dispensing window 3.
  • a relatively light material for the body 2 of the pump 1 (of aluminum for example ) and a heavier but more robust material for the distribution window 3 (steel for example)
  • the design of the pump 1 of the invention is derived from the design of a pump previously developed for an aircraft whose hydraulic pressure is greater (the context of such reuse has been described earlier), and in the case where only the dispensing glass 3 has been modified (as well as possibly the material of other elements of the pump 1), it is of course necessary to keep the shape of the first section 31 at the bearing surface 5 of the ice, which is defined by the dimensions and the rotational movement of the barrel 4 and the pistons 8. It is also noted that, as the sections of each recess of the pump of the invention have a substantially constant surface, the fluid flow properties of the pump of the invention are preserved compared to those of the pump before modification.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Description

L'invention concerne une pompe hydraulique à pistons axiaux comportant un barillet rotatif ayant une face terminale coopérant avec une glace de distribution. Une telle pompe hydraulique est divulguée par exemple dans le document US Patent 5,182,978 .The invention relates to a hydraulic pump with axial pistons comprising a rotary barrel having an end face cooperating with a dispensing ice. Such a hydraulic pump is disclosed for example in the document US Patent 5,182,978 .

ARRIERE PLAN DE L'INVENTIONBACKGROUND OF THE INVENTION

Les programmes aéronautiques récents, qu'ils soient civils ou militaires, ont pour objectif de concevoir de nouveaux aéronefs toujours plus performants, en respectant des délais de développement toujours plus réduits.Recent aeronautics programs, whether civilian or military, aim to design new and more efficient aircraft, while respecting ever-shorter development times.

Ainsi, pour mettre en oeuvre des diminutions de masse visant à réduire la consommation de carburant des aéronefs, pour optimiser l'intégration des différents systèmes embarqués, pour augmenter la sécurité des vols, les constructeurs d'aéronefs sont conduits à transmettre à leurs fournisseurs d'équipements des spécifications techniques qui varient très fortement d'un programme à l'autre.Thus, to implement mass reductions aimed at reducing the fuel consumption of aircraft, to optimize the integration of various embedded systems, to increase the safety of flights, aircraft manufacturers are led to transmit to their suppliers of aircraft. technical specifications that vary greatly from program to program.

Dans ce contexte, la réutilisation, pour un nouveau programme, d'équipements ou de parties d'équipements développés dans le cadre d'un programme précédent est un enjeu crucial pour les fournisseurs d'équipements. Une telle réutilisation présente bien sûr un intérêt économique, mais aussi un intérêt du point de vue de la sécurité. En effet, un équipement dont le fonctionnement a déjà été éprouvé dans un programme précédent obtiendra, à priori, un niveau de fiabilité satisfaisant plus rapidement qu'un équipement nouveau.In this context, the reuse, for a new program, of equipment or parts of equipment developed under a previous program is a crucial issue for equipment suppliers. Such reuse is of course of economic interest, but also of interest from the point of view of safety. Indeed, equipment whose operation has already been tested in a previous program will obtain, a priori, a satisfactory level of reliability faster than new equipment.

Il a été ainsi envisagé d'adapter une pompe hydraulique, préalablement conçue principalement en acier pour fonctionner sur un aéronef dont la pression des circuits hydrauliques était très importante, pour pouvoir l'intégrer dans un aéronef dont la pression hydraulique est moins importante.It was thus envisaged to adapt a hydraulic pump, previously designed mainly steel to operate on an aircraft whose pressure of hydraulic circuits was very important, to be able to integrate it into an aircraft whose hydraulic pressure is less important.

Pour établir une réduction de masse appréciable tout en réutilisant un maximum d'éléments de la pompe, il a été envisagé de remplacer le corps en acier de la pompe par un corps en aluminium. Cependant, des simulations ont dévoilé des zones de contraintes mécaniques importantes au niveau du corps de la pompe.To establish an appreciable reduction of mass while reusing a maximum of elements of the pump, it It has been envisaged to replace the steel body of the pump with an aluminum body. However, simulations have revealed areas of significant mechanical stress at the pump body.

OBJET DE L'INVENTIONOBJECT OF THE INVENTION

L'invention a pour objet de proposer des modifications d'ampleur limitée à apporter à des pompes, de manière à permettre notamment l'adaptation d'un corps en aluminium.The object of the invention is to propose modifications of limited size to be made to pumps, so as to allow in particular the adaptation of an aluminum body.

RESUME DE L'INVENTIONSUMMARY OF THE INVENTION

En vue de la réalisation de ce but, on propose une pompe hydraulique à pistons axiaux comportant un barillet rotatif ayant une face terminale qui coopère avec une glace de distribution comportant deux évidements traversants diamétralement opposés qui sont reliés respectivement à un orifice d'aspiration et à un orifice de refoulement de la pompe, le barillet présentant une pluralité de perçages axiaux débouchant sur la face terminale et dans lesquels des pistons sont montés coulissants, les perçages axiaux étant en communication alternativement avec les orifices d'aspiration et de refoulement à travers les évidements traversants de la glace de distribution. Selon l'invention, les évidements traversants présentent chacun une section courante variable entre une première section délimitée par un premier contour au niveau d'une première face de la glace en regard du barillet, et une deuxième section délimitée par un deuxième contour de forme distincte du premier contour au niveau d'une deuxième face de la glace de distribution opposée à la première face, caractérisé en ce qu'un corps de la pompe est en aluminium, en ce que la glace de distribution est en acier, et en ce que les sections courantes de chaque évidement traversant ont des surfaces sensiblement constantes. En particulier, en choisissant une deuxième section dont le contour est de courbure moins importante que celui de la première section (dont la forme est en haricot), on diminue les contraintes imposées par le fluide au corps à l'issue de son passage au travers des évidements traversants. Les contraintes sont transférées du corps de la pompe vers la glace de distribution. Ce transfert de contraintes permet, en utilisant une matière légère pour fabriquer le corps, de l'aluminium par exemple, et une matière plus lourde et plus robuste pour fabriquer la glace, de l'acier par exemple, d'obtenir une pompe relativement légère et présentant une très bonne robustesse mécanique.With a view to achieving this object, an axial piston hydraulic pump is proposed comprising a rotary barrel having an end face which cooperates with a dispensing window having two diametrically opposite through recesses which are respectively connected to a suction port and to a suction port. a discharge port of the pump, the barrel having a plurality of axial bores opening on the end face and in which pistons are slidably mounted, the axial bores being in communication alternately with the suction and discharge ports through the recesses; through the distribution ice. According to the invention, the through recesses each have a variable current section between a first section delimited by a first contour at a first face of the ice facing the barrel, and a second section delimited by a second contour of distinct shape. the first contour at a second face of the dispensing glass opposite the first face, characterized in that a body of the pump is made of aluminum, in that the dispensing glass is made of steel, and in that the running sections of each through recess have substantially constant surfaces. In particular, by choosing a second section whose contour is of lesser curvature than that of the first section (whose shape is in beans), the constraints imposed by the fluid on the body after its passage through the body are reduced. of the through recesses. The stresses are transferred from the pump body to the dispensing ice. This transfer of stress makes it possible, by using a light material to make the body, aluminum for example, and a heavier and more robust material for making ice, for example steel, to obtain a relatively light pump. and having a very good mechanical strength.

BREVE DESCRIPTION DES DESSINSBRIEF DESCRIPTION OF THE DRAWINGS

L'invention sera mieux comprise à la lumière de la description qui suit en référence aux figures des dessins annexés parmi lesquelles :

  • la figure 1 représente une coupe longitudinale d'une pompe selon l'invention;
  • la figure 2 représente en perspective une glace de distribution d'une pompe selon l'invention.
The invention will be better understood in the light of the description which follows with reference to the figures of the appended drawings in which:
  • the figure 1 represents a longitudinal section of a pump according to the invention;
  • the figure 2 represents in perspective a distribution window of a pump according to the invention.

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

La pompe de l'invention trouve une application particulièrement intéressante dans les circuits hydrauliques d'aéronef dans lesquels les pressions sont couramment de plusieurs centaines de bars. Elle pourra par exemple équiper un actionneur de surface aérodynamique, ou encore un actionneur d'orientation d'atterrisseur.The pump of the invention finds a particularly advantageous application in aircraft hydraulic circuits in which the pressures are commonly several hundred bars. It may for example equip an aerodynamic surface actuator, or a landing gear actuator.

En référence à la figure 1, la pompe 1 selon l'invention comporte un corps de pompe 2 composé d'une première partie 2a et d'une deuxième partie 2b accueillant les éléments constitutifs de la pompe 1. La première partie 2a du corps de pompe reçoit une glace de distribution 3 coopérant avec un barillet 4 par appui d'une face d'appui 5 de la glace de distribution 3 contre une face terminale 6 du barillet 4, ces faces étant perpendiculaires à un axe de révolution X du barillet 4. Le barillet 4 comporte une série de perçages axiaux 7 (c'est à dire s'étendant parallèlement à l'axe de révolution X du barillet) débouchants destinés à servir de guides à des pistons coulissants 8. Pour chaque perçage 7, un conduit 9 met en communication la face d'appui 5 de la glace 3 avec l'intérieur du volume de l'espace cylindrique délimité par chaque perçage 7 et le piston 8 associé.With reference to the figure 1 , the pump 1 according to the invention comprises a pump body 2 composed of a first part 2a and a second part 2b accommodating the constituent elements of the pump 1. The first part 2a of the pump body receives a dispensing glass 3 cooperating with a cylinder 4 by pressing a bearing surface 5 of the dispensing window 3 against an end face 6 of the cylinder 4, these faces being perpendicular to an axis of revolution X of the cylinder 4. The cylinder 4 comprises a series of axial bores 7 (ie extending parallel to the axis of revolution X barrel) in order to serve as guides to sliding pistons 8. For each piercing 7, a conduit 9 communicates the bearing surface 5 of the ice 3 with the interior of the volume of the delimited cylindrical space by each piercing 7 and the associated piston 8.

Un entraîneur 10 entourant le barillet 4 est monté en rotation. L'entraîneur 10 est composé d'une partie cylindrique 11 accueillant le barillet 4, d'une paroi transversale 12 formant fond servant d'appui à un ressort 13 plaquant le barillet 4 contre la glace de distribution 3, et d'un pignon conique 14. L'entraîneur 10 est monté rotatif sur la première partie 2a du corps 2 aux moyens de roulement 15 autorisant la libre rotation de l'entraineur 10 selon un axe confondu avec l'axe de révolution X du barillet 4.A driver 10 surrounding the barrel 4 is rotatably mounted. The trainer 10 is composed of a cylindrical portion 11 accommodating the barrel 4, a transverse wall 12 forming a support for a spring 13 pressing the barrel 4 against the dispensing window 3, and a bevel gear 14. The driver 10 is rotatably mounted on the first portion 2a of the body 2 to the rolling means 15 allowing the free rotation of the driver 10 along an axis coincident with the axis of revolution X of the cylinder 4.

Le pignon conique 14 est destiné à coopérer avec un pignon homologue 16 agencé sur un arbre d'entraînement 17 monté rotatif au moyens de roulements 18 sur la deuxième partie 2b du corps 2, et disposé selon un axe Y qui est concourant avec l'axe X.The bevel gear 14 is intended to cooperate with a counterpart gear 16 arranged on a drive shaft 17 rotatably mounted by means of bearings 18 on the second portion 2b of the body 2, and disposed along an axis Y which is concurrent with the axis X.

Des logements 19 sont disposés axialement sur une face de l'arbre d'entraînement 17 formant un plateau 20 en regard de l'entraîneur 10. Ces logements 19 comportent chacun une partie cylindrique 21 s'enfilant dans un alésage 22 associé ménagé sur la face de l'arbre d'entraînement 17, et présentent chacun un réceptacle sphérique 40 rotulant l'extrémité sphérique 23 d'une biellette 24 associée, dont l'autre extrémité 25 également sphérique est rotulée sur le piston correspondant. L'alésage 22 est réalisé sensiblement en regard de la trace de l'axe du piston sur un plan normal à l'axe Y passant par le centre des réceptacles 40 des logements 19. Les logements 19 sont liés au plateau 20 par une bride circulaire 26 rapportée, commune à tous les logements, au moyen d'une vis centrale 27.Housings 19 are arranged axially on one face of the drive shaft 17 forming a plate 20 facing the driver 10. These housings 19 each comprise a cylindrical portion 21 threading into a bore 22 associated formed on the face of the drive shaft 17, and each have a spherical receptacle 40 swiveling the spherical end 23 of an associated rod 24, the other end also spherical 25 is rotated on the corresponding piston. The bore 22 is made substantially opposite the trace of the axis of the piston on a plane normal to the Y axis passing through the center of the receptacles 40 of the housings 19. The housings 19 are connected to the plate 20 by a circular flange 24 reported, common to all housing, by means of a central screw 27.

L'arbre d'entraînement 17, lorsqu'il est entraîné en rotation, provoque la rotation du plateau 20 et donc de l'entraîneur 10 et du barillet 4. Dans leur mouvement relatif par rapport au barillet 4, les pistons 8 ont un déplacement d'avant en arrière dans les perçages 7. Pendant la rotation, les conduits 9 situés à l'extrémité des perçages 7 se déplacent en regard de deux évidements traversants 28 de la glace de distribution 3. L'un de ces évidements 28 communique avec un orifice d'aspiration 29 de la pompe 1, l'autre vers un orifice de refoulement 30 de la pompe 1.The drive shaft 17, when rotated, causes rotation of the plate 20 and therefore of the driver 10 and the cylinder 4. In their relative movement relative to the cylinder 4, the pistons 8 have a displacement 7. During the rotation, the ducts 9 located at the end of the bores 7 move opposite two through recesses 28 of the dispensing window 3. One of these recesses 28 communicates with a suction port 29 of the pump 1, the other to a discharge port 30 of the pump 1.

Lors du fonctionnement de la pompe, le fluide hydraulique est aspiré et refoulé par la pompe 1 par l'action des pistons 8, via les conduits 9, les évidements traversants 28, et les orifices d'aspiration 29 et de refoulement 30.During operation of the pump, the hydraulic fluid is sucked and discharged by the pump 1 by the action of the pistons 8, via the conduits 9, the through recesses 28, and the suction orifices 29 and discharge 30.

Tout ceci est bien connu et n'est rappelé que pour donner le contexte de l'invention.All this is well known and is only recalled to give the context of the invention.

Conformément à l'invention, et comme cela est visible à la figure 2, les évidements traversants 28, diamétralement opposés sur la glace de distribution 3, présentent chacun une section variable entre une première section 31 délimitée par un premier contour 32 au niveau de la face d'appui 5 de la glace 3, et une deuxième section 33 délimitée par un deuxième contour 34 au niveau d'une deuxième face 35 de la glace de distribution 3 en regard des orifices d'aspiration 29 et de refoulement 30. Chacune des sections 31, 33 a une forme générale oblongue incurvée s'étendant sur la quasi-totalité d'un demi-cercle entourant les centres des faces de la glace. La deuxième section 33 a une forme plus large, moins longue et de contour moins courbé que celle de la première section 31. Malgré cette différence de forme, la première et la deuxième section ont une surface sensiblement égale. Ainsi, chacun des évidements traversant 28 présente une section courante de surface sensiblement constante, à partir d'une première section de forme moins large et plus longue, jusqu'à une seconde section plus large et moins longue.According to the invention, and as can be seen in figure 2 , the diametrically opposed transverse recesses 28 on the distribution window 3, each have a variable section between a first section 31 delimited by a first contour 32 at the bearing surface 5 of the ice 3, and a second section 33 delimited by a second contour 34 at a second face 35 of the distribution window 3 facing the suction orifices 29 and discharge 30. Each of the sections 31, 33 has a generally oblong curved shape extending over the almost all of a semicircle surrounding the centers of the faces of the ice. The second section 33 has a broader shape, less long and less curved contour than that of the first section 31. Despite this difference in shape, the first and second section have a surface substantially equal. Thus, each of the through recesses 28 has a substantially constant surface cross section, from a first section of narrower and longer shape, to a second section wider and shorter.

Cette forme particulière des évidements traversants 28 permet de transférer des contraintes mécaniques du corps 2 de la pompe 1 vers la glace de distribution 3. Ainsi, en choisissant une matière relativement légère pour le corps 2 de la pompe 1 (de l'aluminium par exemple) et une matière plus lourde mais plus robuste pour la glace de distribution 3 (de l'acier par exemple), on obtient une pompe 1 légère et capable de supporter d'importantes contraintes mécaniques.This particular form of the through recesses 28 makes it possible to transfer mechanical stresses from the body 2 of the pump 1 to the dispensing window 3. Thus, by choosing a relatively light material for the body 2 of the pump 1 (of aluminum for example ) and a heavier but more robust material for the distribution window 3 (steel for example), we obtain a light pump 1 and capable of withstanding significant mechanical stresses.

On note que, dans le cas où la conception de la pompe 1 de l'invention est issue de la conception d'une pompe préalablement développée pour un aéronef dont la pression hydraulique est plus importante (le contexte d'une telle réutilisation a été décrit plus tôt), et dans le cas où seule la glace de distribution 3 a été modifiée (ainsi, éventuellement, que la matière d'autres éléments de la pompe 1), il est bien sûr nécessaire de conserver la forme de la première section 31 au niveau de la face d'appui 5 de la glace, qui est définie par les dimensions et le mouvement rotatif du barillet 4 et des pistons 8. On note aussi que, comme les sections de chaque évidement de la pompe de l'invention ont une surface sensiblement constante, les propriétés d'écoulement fluidique de la pompe de l'invention sont préservées par rapport à celles de la pompe avant modification.Note that, in the case where the design of the pump 1 of the invention is derived from the design of a pump previously developed for an aircraft whose hydraulic pressure is greater (the context of such reuse has been described earlier), and in the case where only the dispensing glass 3 has been modified (as well as possibly the material of other elements of the pump 1), it is of course necessary to keep the shape of the first section 31 at the bearing surface 5 of the ice, which is defined by the dimensions and the rotational movement of the barrel 4 and the pistons 8. It is also noted that, as the sections of each recess of the pump of the invention have a substantially constant surface, the fluid flow properties of the pump of the invention are preserved compared to those of the pump before modification.

L'invention n'est pas limitée au mode de réalisation particulier qui vient d'être décrit, mais, bien au contraire, couvre toute variante entrant dans le cadre de l'invention tel que défini par les revendications.The invention is not limited to the particular embodiment which has just been described, but, on the contrary, covers any variant within the scope of the invention as defined by the claims.

Claims (2)

  1. Axial piston hydraulic pump including a rotatable drum (4) having an end face (6) which cooperates with a distribution member (3) having two diametrically opposite openings (28) through it connected to an inlet port (29) and an outlet port (30) of the pump, respectively, the drum (4) having a plurality of axial bores (7) opening onto the end face (6) and in which pistons (8) are slidably mounted, the axial bores (7) alternately communicating with the inlet port (29) and the outlet port (30) through the openings (28) in the distribution member (3), each of the through-openings (28) having a varying main section between a first section (31) delimited by a first contour (32) on a first face (5) of the distribution member (3) facing the drum (4) and a second section (33) delimited by a second contour (34) a different shape than the first contour on a second face (35) of the distribution member opposite the first face, characterized in that a body (2) of the pump is made of aluminium, in that the distribution member (3) is made of steel and in that the main sections of the through-openings (28) each have a substantially constant area.
  2. Pump according to claim 1, wherein the first section (31) and the second section (33) have an oblong shape, the shape of the second section (33) being wider and shorter than the shape of the first section (31).
EP13169420.0A 2012-05-31 2013-05-28 Hydraulic pump with axial pistons Active EP2669516B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1255056A FR2991400B1 (en) 2012-05-31 2012-05-31 HYDRAULIC PUMP WITH AXIAL PISTONS

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EP2669516B1 true EP2669516B1 (en) 2017-07-12

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CN104533596B (en) * 2014-11-15 2017-01-18 汪培杰 Design method of trigger wheel for fluid transfer device
ES2796054T3 (en) * 2015-02-11 2020-11-25 Danfoss As Hydraulic device
CN105604916B (en) * 2016-02-21 2018-08-03 珠海格力节能环保制冷技术研究中心有限公司 Compressor valve board and compressor valve component
DE102018214165A1 (en) * 2018-08-22 2020-02-27 Robert Bosch Gmbh Control plate for axial piston machine and axial piston machine with control plate

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US3523678A (en) * 1968-03-13 1970-08-11 Lucas Industries Ltd Valve plate for a hydraulic pump or motor
JPS59215973A (en) * 1983-05-20 1984-12-05 Hitachi Constr Mach Co Ltd Variable displacement hydraulic rotary machine of tilting cylinder block type
JP2577974B2 (en) * 1988-10-03 1997-02-05 日立建機株式会社 Variable capacity oblique axis hydraulic machine
DE4035748A1 (en) * 1989-11-09 1991-05-16 Vickers Systems Gmbh High speed axial piston pump - has pressed against seal of barrel and including pressure zone
US6640687B1 (en) * 2002-08-09 2003-11-04 Sauer-Danfoss Inc. Control system for hydrostatic pump

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FR2991400A1 (en) 2013-12-06
FR2991400B1 (en) 2015-12-25

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