EP0040161B1 - Wobble plate of an axial-type piston pump - Google Patents

Wobble plate of an axial-type piston pump Download PDF

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Publication number
EP0040161B1
EP0040161B1 EP81400765A EP81400765A EP0040161B1 EP 0040161 B1 EP0040161 B1 EP 0040161B1 EP 81400765 A EP81400765 A EP 81400765A EP 81400765 A EP81400765 A EP 81400765A EP 0040161 B1 EP0040161 B1 EP 0040161B1
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EP
European Patent Office
Prior art keywords
plate
axis
pistons
cylinder
projection
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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.)
Expired
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EP81400765A
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German (de)
French (fr)
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EP0040161A1 (en
Inventor
François Couillard
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Individual
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Individual
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Publication date
Priority claimed from FR8010916A external-priority patent/FR2484555B1/en
Priority claimed from FR8106018A external-priority patent/FR2502702B1/en
Application filed by Individual filed Critical Individual
Priority to AT81400765T priority Critical patent/ATE10301T1/en
Publication of EP0040161A1 publication Critical patent/EP0040161A1/en
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Publication of EP0040161B1 publication Critical patent/EP0040161B1/en
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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
    • F04B1/26—Control
    • F04B1/28—Control of machines or pumps with stationary cylinders
    • F04B1/29—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block
    • F04B1/295—Control of machines or pumps with stationary cylinders by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate

Definitions

  • the plate is tiltable about an axis orthogonal to said axis of revolution carried laterally by a support for driving the plate in rotation.
  • the invention relates to this type of pump and relates to an improvement in construction to meet a particular requirement imposed by the use of these pumps in the field of very precise metering at relatively low flow rate less than the deciliter and which can reach a few microliters per minute. This requirement is particularly severe in liquid chromatography. It is for reasons of precision to keep each piston of the pump in an invariable delivery neutral position regardless of the displacement, so the stroke of the pistons.
  • the invention relates to a reciprocating piston pump of the fixed barrel type comprising a plurality of parallel pistons whose axes are regularly distributed on a cylinder and which are held in abutment by their end external to the barrel on a plate capable of to be inclined around a shaft perpendicular to the axis of the aforesaid cylinder.
  • the plate can rotate around the axis of said cylinder and the surface portion of the plate on which said ends of the pistons rest has in a plane passing through the axis of said cylinder and perpendicular to said shaft.
  • articulation of the plate a circular projection centered on the axis of the articulation shaft and forming a stop for said ends of the pistons.
  • Said projection can be toroidal and defined by the surface generated by the above-mentioned circular projection during a movement of revolution around the axis of said cylinder, and the contact between the latter and the piston ends can be practically punctual.
  • the inclination of the plate can be adjusted by means of a movable fulcrum along the axis of said cylinder which cooperates with a face of the plate opposite to that provided with the above-mentioned surface portion, while the contact part of this face with said point has a cam profile allowing a variation of the piston stroke proportional to the displacement of the point along said axis.
  • It can also be adjusted by means of a circular track centered on the axis of revolution and cooperating with a part of the plate diametrically opposite to said articulation axis.
  • a fixed pump body 1 with a longitudinal axis 1a around which are regularly distributed three, four or more, pistons 2 whose axes 2a are located on a cylinder with axis 1a.
  • pistons 2 are slidably mounted in the body or barrel 1 and their end 2b cooperates with a chamber 3 to vary the volume.
  • springs 2c are kept applied by springs 2c on a plate 4 which is articulated at 5 around a shaft orthogonal to the axis 1a and carried by a rotating support 10 around the axis 1a.
  • a member 6 - for example a micrometric threaded rod - serves as an adjustable stop for the plate 4 and its position along the axis 1a determines the inclination of the plate and thereby the stroke of the pistons maneuvered by the inclined plate and the displacement of the pump.
  • FIG. 3 One of the solutions to this problem offered by the invention is illustrated in FIG. 3 on which we find some of the elements already described with the same references.
  • the upper face 4a of the plate has a surface portion 7 on which the pistons 2 bear.
  • This surface portion 7 is such that, in a plane containing the axis 1 a and perpendicular to the axis 5 - that is to say the plane of the figure -, it has a circular trace 7a constituted by an arc of a circle centered on the axis 5.
  • the place of point 8 during the rotation of the plate is a circle contained in a plane perpendicular to the axis 1 which defines the neutral point of delivery of all the pistons.
  • the surface 7 does not have an ascending slope from the face 4a of the plate along the contact line of the pistons when this plate is perpendicular to the axis 1a.
  • a preferred form of the surface 7 will be constituted by the surface generated by the rotation of the trace 7a around the axis 1a.
  • the surface 7 will then be toroidal (as in the figure).
  • the pistons 2 have an end surface 2d on the side of the convex plate (here spherical) such that the contact of these pistons with the surface 7 is practically punctual.
  • This surface 2d can affect the profile of a cam in the plane of the figure - and more generally in each radial plane passing through the axes 2a - which would, taking into account the geometry of the movable elements relative to each other, make the variation of the piston stroke by inclination of the proportional plate - linear function - of the movement of the member 6. In this case, care will be taken to stop the pistons rotating around their axis relative to the pump body.
  • Such a profile of the surfaces 2d brings an improvement to the pump affecting in a high order the precision of the adjustment, taking into account that the corrections which it brings are minimal.
  • the contact end of the member 6 will be able to be made in adequate cam profile of revolution and that the cutting of the face 4b will be carried out beyond the shaft 5 relative to the axis. 1 a if the platform is tilted in direction A.
  • a part 4c of the plate 4 cooperating with a circular track 9 extending a plane perpendicular to the axis 1 a and adjustable along this axis.
  • These two means replace the central member 6 to adjust the inclination of the plate 4.
  • the bearing surface of said part 4c can also be cut on the cam surface to make the relationship between the movement linear. of track 9 and the variation of the stroke of the subsequent pistons.
  • the position of the axis 5a of the shaft 5 can be indifferent at least in theory (apart from its orientation) and is shown arbitrarily in the figure. It may however be advantageous to provide it directly above the axes 2a.
  • the arrangement se-Ion the invention allows to choose the best technological possibilities of the position of this axis.
  • the invention finds an interesting application in the field of precision pumps.

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

Description

Il est connu, dans le domaine des pompes, d'animer d'un mouvement alternatif des pistons montés à coulissement dans un corps de pompe appelé barillet et régulièrement répartis dans ce corps de pompe autour d'un axe parallèle à l'axe de chacun des pistons, au moyen d'un plateau inclinable sur lequel prennent appui les pistons, en faisant tourner le plateau par rapport au barillet ou, inversement, le barillet par rapport au plateau autour de l'axe longitudinal susdit.It is known in the field of pumps to animate reciprocating pistons mounted to slide in a pump body called a barrel and regularly distributed in this pump body around an axis parallel to the axis of each. pistons, by means of a tilting plate on which the pistons bear, by rotating the plate relative to the barrel or, conversely, the barrel relative to the plate around the aforesaid longitudinal axis.

Dans le cas notamment d'un plateau tournant et d'un barillet fixe, le plateau est inclinable autour d'un axe orthogonal audit axe de révolution porté latéralement par un support d'entraînement en rotation du plateau.In the case in particular of a rotating plate and a fixed barrel, the plate is tiltable about an axis orthogonal to said axis of revolution carried laterally by a support for driving the plate in rotation.

L'invention est relative à ce type de pompe et concerne un perfectionnement de construction pour répondre à une exigence particulière qu'impose l'usage de ces pompes dans le domaine du dosage très précis à relativement faible débit inférieur au décilitre et pouvant atteindre quelques microlitres par minute. Cette exigence est particulièrement sévère en chromatographie en phase liquide. Il s'agit pour des raisons de précision de conserver à chacun des pistons de la pompe une position de point mort de refoulement invariable quelle que soit la cylindrée, donc la course des pistons.The invention relates to this type of pump and relates to an improvement in construction to meet a particular requirement imposed by the use of these pumps in the field of very precise metering at relatively low flow rate less than the deciliter and which can reach a few microliters per minute. This requirement is particularly severe in liquid chromatography. It is for reasons of precision to keep each piston of the pump in an invariable delivery neutral position regardless of the displacement, so the stroke of the pistons.

Par le brevet des Etats Unis d'Amérique n° 2 349 310 on connaît une pompe dans laquelle on a recherché une telle position des pistons, toutefois les tiges des pistons sont articulées sur le plateau inclinable et l'axe d'articulation doit passer par le centre de l'articulation à rotule de la tige de piston sur le plateau. Il en résulte que cette disposition nécessite donc une grande complexité en ce qui concerne la réalisation pour obtenir une position précise de l'axe d'articulation du plateau qui doit passer par le centre de l'articulation à rotule.By the patent of the United States of America n ° 2 349 310 a pump is known in which one sought such a position of the pistons, however the rods of the pistons are articulated on the tilting plate and the axis of articulation must pass through the center of the ball joint of the piston rod on the plate. As a result, this arrangement therefore requires a great deal of complexity as regards the embodiment in order to obtain a precise position of the axis of articulation of the plate which must pass through the center of the ball joint.

A cet effet, donc l'invention concerne une pompe à pistons alternatifs du type à barillet fixe comportant une pluralité de pistons parallèles dont les axes sont régulièrement répartis sur un cylindre et qui sont maintenus en appui par leur extrémité extérieure au barillet sur un plateau susceptible d'être incliné autour d'un arbre perpendiculaire à l'axe du cylindre susdit.To this end, therefore, the invention relates to a reciprocating piston pump of the fixed barrel type comprising a plurality of parallel pistons whose axes are regularly distributed on a cylinder and which are held in abutment by their end external to the barrel on a plate capable of to be inclined around a shaft perpendicular to the axis of the aforesaid cylinder.

Conformément à la présente invention, le plateau peut tourner autour de l'axe dudit cylindre et la portion de surface du plateau sur laquelle s'appuient lesdites extrémités des pistons possède dans un plan passant par l'axe dudit cylindre et perpendiculaire audit arbre d'articulation du plateau une saillie circulaire centrée sur l'axe de l'arbre d'articulation et formant une butée pour lesdites extrémités des pistons.According to the present invention, the plate can rotate around the axis of said cylinder and the surface portion of the plate on which said ends of the pistons rest has in a plane passing through the axis of said cylinder and perpendicular to said shaft. articulation of the plate a circular projection centered on the axis of the articulation shaft and forming a stop for said ends of the pistons.

Ladite saillie peut être torique et définie par la surface engendrée par la saillie circulaire susdite lors d'un mouvement de révolution autour de l'axe dudit cylindre, et le contact entre cette dernière et les extrémités de piston peut être pratiquement ponctuel. De plus, l'inclinaison du plateau peut être réglée au moyen d'un point d'appui mobile le long de l'axe dudit cylindre qui coopère avec une face du plateau opposée à celle pourvue de la portion de surface susdite, tandis que la partie de contact de cette face avec ledit point présente un profil de came permettant une variation de la course des pistons proportionnelle au déplacement du point le long dudit axe.Said projection can be toroidal and defined by the surface generated by the above-mentioned circular projection during a movement of revolution around the axis of said cylinder, and the contact between the latter and the piston ends can be practically punctual. In addition, the inclination of the plate can be adjusted by means of a movable fulcrum along the axis of said cylinder which cooperates with a face of the plate opposite to that provided with the above-mentioned surface portion, while the contact part of this face with said point has a cam profile allowing a variation of the piston stroke proportional to the displacement of the point along said axis.

Elle peut également être réglée au moyen d'une piste circulaire centrée sur l'axe de révolution et coopérant avec une partie du plateau dia- mètralement opposée audit axe d'articulation.It can also be adjusted by means of a circular track centered on the axis of revolution and cooperating with a part of the plate diametrically opposite to said articulation axis.

L'invention sera mieux comprise au cours de la description donnée ci-après à titre d'exemple purement indicatif et non limitatif qui permettra d'en dégager les avantages et les caractéristiques secondaires.The invention will be better understood during the description given below by way of purely indicative and nonlimiting example which will make it possible to identify the advantages and the secondary characteristics thereof.

Il sera fait référence aux dessins annexés dans lesquels:

  • - la fig. 1 illustre la construction générale d'une pompe connue;
  • - les fig. 2A et 2B montrent par un détail de construction les imperfections de fonctionnement d'une pompe du type de la fig. 1;
  • - la fig. 3 illustre un mode de réalisation du perfectionnement selon l'invention.
Reference will be made to the appended drawings in which:
  • - fig. 1 illustrates the general construction of a known pump;
  • - figs. 2A and 2B show a construction detail of the operating imperfections of a pump of the type of FIG. 1;
  • - fig. 3 illustrates an embodiment of the improvement according to the invention.

En se reportant au schéma de la fig. 1, on voir un corps de pompe 1 fixe d'axe longitudinal 1a autour duquel sont régulièrement répartis trois, quatre ou plus, pistons 2 dont les axes 2a sont situés sur un cylindre d'axe 1a. Ces pistons sont montés coulissants dans le corps ou barillet 1 et leur extrémité 2b coopère avec une chambre 3 pour en faire varier le volume. Ces pistons sont maintenus appliqués par des ressorts 2c sur un plateau 4 qui est articulé en 5 autour d'un arbre orthogonal à l'axe 1 a et porté par un support tournant 10 autour de l'axe 1a. Un organe 6 - par exemple une tige filetée micrométrique - sert de butée réglable au plateau 4 et sa position le long de l'axe 1a détermine l'inclinaison du plateau et par là la course des pistons manoeuvrés par le plateau incliné et la cylindrée de la pompe.Referring to the diagram in fig. 1, we see a fixed pump body 1 with a longitudinal axis 1a around which are regularly distributed three, four or more, pistons 2 whose axes 2a are located on a cylinder with axis 1a. These pistons are slidably mounted in the body or barrel 1 and their end 2b cooperates with a chamber 3 to vary the volume. These pistons are kept applied by springs 2c on a plate 4 which is articulated at 5 around a shaft orthogonal to the axis 1a and carried by a rotating support 10 around the axis 1a. A member 6 - for example a micrometric threaded rod - serves as an adjustable stop for the plate 4 and its position along the axis 1a determines the inclination of the plate and thereby the stroke of the pistons maneuvered by the inclined plate and the displacement of the pump.

Lorsque le plateau 4 est parfaitement perpendiculaire à l'axe 1a, sa rotation ne provoque aucun mouvement des pistons qui restent à leur point mort haut tel qu'il est représenté sur la fig. 2B. On peut d'ailleurs régler ce point mort de refoulement de manière que les pistons ne pénètrent pas dans la chambre 3.When the plate 4 is perfectly perpendicular to the axis 1a, its rotation does not cause any movement of the pistons which remain at their top dead center as shown in FIG. 2B. It is also possible to adjust this neutral point of delivery so that the pistons do not enter chamber 3.

Mais on voit sur la fig. 2A que, si l'on incline le plateau 4 autour de l'arbre 5, on modifie la position du point mort haut (de refoulement) des pistons d'une valeur de fonction de l'angle d'inclinaison. Ces dispositions sont préjudiciables dans certaines applications des pompes pour des dosages extrêmement précis.But we see in fig. 2A that, if the plate 4 is inclined around the shaft 5, the position of the top dead center (of delivery) of the pistons is modified by a value of function of the angle of inclination. These provisions are detrimental in certain applications of pumps for extremely precise dosages.

L'une des solutions à ce problème que propose l'invention est illustrée par la fig. 3 sur laquelle on retrouve certains des éléments déjà décrits avec les mêmes références.One of the solutions to this problem offered by the invention is illustrated in FIG. 3 on which we find some of the elements already described with the same references.

On notera en regard de cette figure que la face supérieure 4a du plateau possède une portion de surface 7 sur laquelle prennent appui les pistons 2. Cette portion de surface 7 est telle que, dans un plan contenant l'axe 1 a et perpendiculaire à l'axe 5 - c'est-à-dire le plan de figure -, elle possède une trace 7a circulaire constituée par un arc de cercle centré sur l'axe 5. Ainsi, quelle que soit l'inclinaison du plateau 4 autour de l'axe 5, le point de contact 8 des pistons avec le plateau dans le plan susdit est fixe. Il est donc situé à une distance fixe du barillet 1. Si l'inclinaison du plateau est réalisée dans le sens de la flèche A, le lieu du point 8 lors de la rotation du plateau est un cercle contenu dans un plan perpendiculaire à l'axe 1 qui définit le point mort de refoulement de tous les pistons. On voit qu'ainsi tous les pistons ont un point mort de refoulement invariable et indépendant de l'inclinaison du plateau. Ce résultat sera obtenu si, par ailleurs, la surface 7 ne présente pas de pente ascendante à partir de la face 4a du plateau le long de la ligne de contact des pistons lorsque ce plateau est perpendiculaire à l'axe 1 a.It will be noted with regard to this figure that the upper face 4a of the plate has a surface portion 7 on which the pistons 2 bear. This surface portion 7 is such that, in a plane containing the axis 1 a and perpendicular to the axis 5 - that is to say the plane of the figure -, it has a circular trace 7a constituted by an arc of a circle centered on the axis 5. Thus, what that the inclination of the plate 4 around the axis 5, the point of contact 8 of the pistons with the plate in the above-mentioned plane is fixed. It is therefore located at a fixed distance from the barrel 1. If the inclination of the plate is made in the direction of the arrow A, the place of point 8 during the rotation of the plate is a circle contained in a plane perpendicular to the axis 1 which defines the neutral point of delivery of all the pistons. We see that thus all the pistons have a neutral point of unchanging discharge and independent of the inclination of the plate. This result will be obtained if, moreover, the surface 7 does not have an ascending slope from the face 4a of the plate along the contact line of the pistons when this plate is perpendicular to the axis 1a.

Une forme préférée de la surface 7 sera constituée par la surface engendrée par la rotation de la trace 7a autour de l'axe 1 a. La surface 7 sera alors torique (comme sur la figure).A preferred form of the surface 7 will be constituted by the surface generated by the rotation of the trace 7a around the axis 1a. The surface 7 will then be toroidal (as in the figure).

On aura noté que les pistons 2 présentent une surface d'extrémité 2d du côté du plateau convexe (ici sphérique) telle que le contact de ces pistons avec la surface 7 soit pratiquement ponctuel. Cette surface 2d peut affecter le profil d'une came dans le plan de la figure - et plus généralement dans chaque plan radial passant par les axes 2a - qui permettrait, compte tenu de la géométrie des éléments mobiles les uns par rapport aux autres, de rendre la variation de la course des pistons par inclinaison du plateau proportionnelle - fonction linéaire - du déplacement de l'organe 6. On prendra soin dans ce cas d'arrêter les pistons en rotation autour de leur axe par rapport au corps de pompe. Un tel profil des surfaces 2d apporte un perfectionnement à la pompe affectant dans un ordre élevé la précision du réglage, compte tenu du fait que les corrections qu'il apporte sont minimes.It will be noted that the pistons 2 have an end surface 2d on the side of the convex plate (here spherical) such that the contact of these pistons with the surface 7 is practically punctual. This surface 2d can affect the profile of a cam in the plane of the figure - and more generally in each radial plane passing through the axes 2a - which would, taking into account the geometry of the movable elements relative to each other, make the variation of the piston stroke by inclination of the proportional plate - linear function - of the movement of the member 6. In this case, care will be taken to stop the pistons rotating around their axis relative to the pump body. Such a profile of the surfaces 2d brings an improvement to the pump affecting in a high order the precision of the adjustment, taking into account that the corrections which it brings are minimal.

De la même manière, on pourra réaliser en profil de came adéquat l'extrémité de contact de l'organe 6 sera de révolution et que le taillage de la face 4b sera réalisé au-delà de l'arbre 5 par rapport à l'axe 1 a si le plateau est incliné dans le sens A.Likewise, the contact end of the member 6 will be able to be made in adequate cam profile of revolution and that the cutting of the face 4b will be carried out beyond the shaft 5 relative to the axis. 1 a if the platform is tilted in direction A.

Enfin, sur cette fig. 3, on a représenté une partie 4c du plateau 4 coopérant avec une piste circulaire 9 s'étendant un plan perpendiculaire à l'axe 1 a et réglable le long de cet axe. Ces deux moyens viennent en substitution de l'organe central 6 pour assurer le réglage de l'inclinaison du plateau 4. La surface d'appui de ladite partie 4c pourra elle aussi être taillée en surface de came pour rendre linéaire la relation entre le mouvement de la piste 9 et la variation de la course des pistons subséquents.Finally, in this fig. 3, there is shown a part 4c of the plate 4 cooperating with a circular track 9 extending a plane perpendicular to the axis 1 a and adjustable along this axis. These two means replace the central member 6 to adjust the inclination of the plate 4. The bearing surface of said part 4c can also be cut on the cam surface to make the relationship between the movement linear. of track 9 and the variation of the stroke of the subsequent pistons.

La position de l'axe 5a de l'arbre 5 peut être indifférente au moins en théorie (hormis son orientation) et est représentée quelconque sur la figure. Il peut cependant être avantageux de la prévoir à l'aplomb des axes 2a. La disposition se-Ion l'invention permet de choisir au mieux des possibilités technologiques de la position de cet axe.The position of the axis 5a of the shaft 5 can be indifferent at least in theory (apart from its orientation) and is shown arbitrarily in the figure. It may however be advantageous to provide it directly above the axes 2a. The arrangement se-Ion the invention allows to choose the best technological possibilities of the position of this axis.

L'invention trouve une application intéressante dans le domaine des pompes de précision.The invention finds an interesting application in the field of precision pumps.

Claims (7)

1. Reciprocating piston pump of the type incorporating a fixed barrel piston-chamber 1 comprising a plurality of parallel pistons 2 whose axes 2a are regularly distributed over a cylinder and which are maintained in abutment by their end 2d outside the barrel on a plate 4 capable of being inclined about a shaft 5 perpendicular to the axis 1 a of said cylinder, characterized in that the plate 4 may rotate about the axis of said cylinder and the surface portion 7 of the plate 4 on which said ends 2d of the pistons bear possesses in a plane passing through the axis of said cylinder 1a and perpendicular to said pivot shaft 5 of the plate 4 a circular projection 7a centred on the axis 5a of the pivot shaft 5 and forming a stop for said ends of the pistons.
2. Pump according to Claim 1, characterized in that said projection 7a is toric and is defined by the surface generated by said circular projection 7a during a movement of revolution about the axis 1 a of said cylinder.
3. Pump according to any one of the preceding claims, characterized in that the contact 8 between the ends 2d of said pistons and said projection 7a is virtually punctual.
4. Pump according to any one of the preceding Claims, characterized in that the inclination of the plate is adjusted by means of a mobile point 6 along the axis of said cylinder 1a which cooperates with a face of the plate 4b opposite that provided with the projection 7a and in that the part of this face 4b in contact with said point 6 presents a cam profile allowing a variation of the stroke of the pistons proportional to the displacement of the point along said axis 1 a.
5. Pump according to any one of the preceding Claims, characterized in that the inclination of the plate is adjusted by a circular track 9 centred on the axis of said cylinder cooperating with a part 4c of the plate diametrically opposite the said pivot shaft 5, said track being adjustable in position along said axis 1a.
6. Pump according to Claim 5, characterized in that the contact between said part of the plate and the track is ensured along a cam profile made on said part allowing a variation of the stroke of the pistons proportional to the displacement of said track.
7. Pump according to any one of Claims 4 to 6, characterized in that the point of contact of the pistons with the said projection 7a moves along a cam profile 2d made at the end of said pistons 2 to allow a variation of the stroke of these latter proportional to the displacement of the element 6, for controlling the inclination of the plate.
EP81400765A 1980-05-14 1981-05-13 Wobble plate of an axial-type piston pump Expired EP0040161B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81400765T ATE10301T1 (en) 1980-05-14 1981-05-13 CONTROLLABLE AXIAL PISTON PUMP WITH FIXED CYLINDER BLOCK.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8010916A FR2484555B1 (en) 1980-05-14 1980-05-14 PUMP DEVICE FOR LIQUID
FR8010916 1980-05-14
FR8106018A FR2502702B1 (en) 1981-03-25 1981-03-25 ALTERNATIVE PISTON PUMP WITH FIXED BARREL AND TURNTABLE
FR8106018 1981-03-25

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Publication Number Publication Date
EP0040161A1 EP0040161A1 (en) 1981-11-18
EP0040161B1 true EP0040161B1 (en) 1984-11-14

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EP81400765A Expired EP0040161B1 (en) 1980-05-14 1981-05-13 Wobble plate of an axial-type piston pump

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EP (1) EP0040161B1 (en)
DE (1) DE3167159D1 (en)
IT (1) IT1142504B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10307507B4 (en) * 2002-02-21 2013-09-12 Institut Français du Pétrole Method and system for metering fluids injected in a pumping device

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EP0040161A1 (en) 1981-11-18
IT8148454A0 (en) 1981-05-13
IT1142504B (en) 1986-10-08
DE3167159D1 (en) 1984-12-20

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