EP1887222B1 - Improvement for radial piston pumps - Google Patents

Improvement for radial piston pumps Download PDF

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Publication number
EP1887222B1
EP1887222B1 EP07290798A EP07290798A EP1887222B1 EP 1887222 B1 EP1887222 B1 EP 1887222B1 EP 07290798 A EP07290798 A EP 07290798A EP 07290798 A EP07290798 A EP 07290798A EP 1887222 B1 EP1887222 B1 EP 1887222B1
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EP
European Patent Office
Prior art keywords
pump
barrel
spring barrel
collector
bores
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.)
Active
Application number
EP07290798A
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German (de)
French (fr)
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EP1887222A1 (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 of EP1887222A1 publication Critical patent/EP1887222A1/en
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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
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/10—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary
    • F04B1/107—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary with actuating or actuated elements at the outer ends of the cylinders
    • F04B1/1071—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary with actuating or actuated elements at the outer ends of the cylinders with rotary cylinder blocks
    • F04B1/1072—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary with actuating or actuated elements at the outer ends of the cylinders with rotary cylinder blocks with cylinder blocks and actuating cams rotating together
    • 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
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/047—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the outer ends of the cylinders
    • F04B1/0472—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the outer ends of the cylinders with cam-actuated distribution members

Definitions

  • the present invention relates to a rotary barrel pump in which the pistons move in bores formed through the barrel, diametrically at its axis, deviating under the effect of the centrifugal force and approaching by pressing on an eccentric crown.
  • the pump according to the invention comprises feeding means and output in the faith very simple and particularly powerful that allow its use at very high speeds of rotation of the barrel.
  • the pump according to the invention is a rotary barrel pump in which the pistons move in bores formed diametrically through said barrel by deviating under the effect of the centrifugal force and approaching by pressing on an eccentric ring characterized in that said bores communicate: firstly with the supply pipe by means of pipes opening into a chamber situated at the rear of the rotary barrel, chamber into which the supply pipe opens; on the other hand with the discharge pipe by means of a manifold, applied against the rear face of said barrel by a spring, this manifold being provided with a cup communicating with said discharge pipe; said collector being eccentric with respect to the axis of the barrel; so that each of the pipes opens, during a half-turn in said chamber and during a half-turn in the cup.
  • the pump indicated by the general reference P is driven by a motor M.
  • the pump P is constituted by a barrel 1 which, in the example shown, is a solid cylindrical body, whose end 1a is traversed, according to a diameter, by a bore 2.
  • This bore 2 is divided into two equal parts 2a, 2b by a plug 3 placed on the axis XX of the barrel 1.
  • this ring is eccentric with respect to the axis XX.
  • This pump is intended to be driven at very high speeds, of the order of 25,000 t / m.
  • the weights 4a, 4b are spaced from the axis XX by the centrifugal force and are brought towards the center by the ring 5, which is eccentric: this movement back and forth of the weights 4a, 4b causes an effect pumping, said weights acting as pistons.
  • the hydraulic liquid can enter the bores 2 during the movement of separation of the weights / pistons 4 and can be evacuated under pressure when these weights / pistons 4 are pushed by the ring 5.
  • the bores 2a and 2b are each connected by a pipe 6a, 6b to a chamber 7 in which the hydraulic liquid arrives via an intake pipe 8.
  • a discharge manifold 9 is applied by a spring 10 against the flat rear face 11 of the rear portion 1a of the barrel 1.
  • the end of said discharge manifold 9 which bears against the face 11, comprises a cylindrical cup 12, which communicates with an outlet pipe 13.
  • the axis of the cup 12 is eccentric with respect to the axis XX of the barrel 1.
  • the ring 5 is constituted by a bearing, the ends of the pistons 4 being in abutment against the inner ring of said bearing.
  • This inner ring is rotated by the support exerted by the pistons, with a slight sliding thereof.
  • a pump such as the one shown in Figures 1 to 3 , can be driven up to 20,000 rpm and more without the need to pressurize the pump supply and can supply up to 700 bar pressure.
  • the collector 9 is constituted to be hydrostatically balanced, the surface of its rear face being slightly greater than that of the cup 12, the spring 10 for the sole purpose of ensuring proper operation without pressure or very low discharge pressure.
  • the barrel 1 is traversed by a single bore 2, but it is possible to have several bores each provided with two pistons.
  • the present invention makes it possible to realize with simple and inexpensive mechanical means a pump having remarkable qualities.

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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

La présente invention a pour objet une pompe à barillet tournant dans laquelle les pistons se déplacent dans des alésages ménagés à travers le barillet, diamétralement à son axe, en s'écartant sous l'effet de la force centrifuge et en se rapprochant par appui sur une couronne excentrée.The present invention relates to a rotary barrel pump in which the pistons move in bores formed through the barrel, diametrically at its axis, deviating under the effect of the centrifugal force and approaching by pressing on an eccentric crown.

De telles pompes sont connues par les brevets WO 02/084105 du 24 octobre 2002; US 2004/065192 du 17 septembre 2003 ; DE 198 43 120 du 21 septembre 1998 ; DE 36 28 769 du 25 août 1986 et EP 0 812 985 du 3 juin 1997, et DE 19504380 , considéré comme l'état de la technique le plus proche.Such pumps are known by the patents WO 02/084105 of October 24, 2002; US 2004/065192 September 17, 2003; DE 198 43 120 of 21 September 1998; DE 36 28 769 of 25 August 1986 and EP 0 812 985 of 3 June 1997, and From 19504380 , considered the closest state of the art.

Ces pompes connues présentent toutes l'inconvénient de mettre en oeuvre des moyens complexes pour assurer l'alimentation et le refoulement de l'huile ; ce qui, en pratique, interdit leur emploi pour des vitesses élevées de rotation du barillet et donc en limite l'usage.These known pumps all have the disadvantage of implementing complex means to ensure the supply and discharge of the oil; which, in practice, prohibits their use for high speeds of rotation of the barrel and therefore limits its use.

La pompe suivant l'invention comporte des moyens d'alimentation et de sortie à la foi très simples et particulièrement performants qui permettent son utilisation à de très hautes vitesses de rotation du barillet.The pump according to the invention comprises feeding means and output in the faith very simple and particularly powerful that allow its use at very high speeds of rotation of the barrel.

La pompe selon l'invention est une pompe à barillet tournant dans laquelle les pistons se déplacent dans des alésages ménagés diamétralement à travers ledit barillet en s'écartant sous l'effet de la force centrifuge et en se rapprochant par appui sur une couronne excentrée caractérisée par le fait que lesdits alésages communiquent : d'une part avec la canalisation d'alimentation au moyen de canalisations débouchant dans une chambre située à l'arrière du barillet tournant, chambre dans laquelle débouche la canalisation d'alimentation ; d'autre part avec la canalisation de refoulement au moyen d'un collecteur, appliquée contre la face arrière dudit barillet par un ressort, ce collecteur étant muni d'une coupelle communiquant avec ladite canalisation de refoulement ; ledit collecteur étant excentré par rapport à l'axe du barillet ; de telle sorte que chacune des canalisations débouche, pendant un demi-tour dans ladite chambre et pendant un demi-tour dans la coupelle.The pump according to the invention is a rotary barrel pump in which the pistons move in bores formed diametrically through said barrel by deviating under the effect of the centrifugal force and approaching by pressing on an eccentric ring characterized in that said bores communicate: firstly with the supply pipe by means of pipes opening into a chamber situated at the rear of the rotary barrel, chamber into which the supply pipe opens; on the other hand with the discharge pipe by means of a manifold, applied against the rear face of said barrel by a spring, this manifold being provided with a cup communicating with said discharge pipe; said collector being eccentric with respect to the axis of the barrel; so that each of the pipes opens, during a half-turn in said chamber and during a half-turn in the cup.

A titre d'exemple non limitatif et pour faciliter la compréhension de l'invention, on a représenté aux dessins annexés :

  • Figure 1 : une vue en coupe longitudinale d'un exemple de réalisation de l'invention.
  • Figure 2 : une vue à échelle agrandie d'une partie de la figure 1, les pièces étant en position médiane.
  • Figure 3 : une vue correspondant à la figure 2, après une rotation de 90°.
  • Figure 4 : une vue en coupe selon BB de la figure 1.
By way of non-limiting example and to facilitate the understanding of the invention, there is shown in the accompanying drawings:
  • Figure 1 : a longitudinal sectional view of an exemplary embodiment of the invention.
  • Figure 2 : an enlarged view of part of the figure 1 , the parts being in median position.
  • Figure 3 : a view corresponding to the figure 2 , after a rotation of 90 °.
  • Figure 4 : a sectional view according to BB of the figure 1 .

En se reportant à ces figures, on voit que la pompe indiquée par la référence générale P, est entraînée par un moteur M.Referring to these figures, we see that the pump indicated by the general reference P, is driven by a motor M.

La pompe P est constituée par un barillet 1 qui, dans l'exemple représenté, est un corps cylindrique plein, dont l'extrémité 1a est traversée, selon un diamètre, par un alésage 2.The pump P is constituted by a barrel 1 which, in the example shown, is a solid cylindrical body, whose end 1a is traversed, according to a diameter, by a bore 2.

Cet alésage 2 est séparé en deux parties égales 2a, 2b par un bouchon 3 placé sur l'axe XX du barillet 1.This bore 2 is divided into two equal parts 2a, 2b by a plug 3 placed on the axis XX of the barrel 1.

Dans les alésages 2a, 2b coulissent librement deux masselottes cylindriques 4a et 4b, qui font légèrement saillie hors de la partie cylindrique arrière 1a du barillet 1.In the bores 2a, 2b slide freely two cylindrical weights 4a and 4b, which protrude slightly out of the rear cylindrical portion 1a of the barrel 1.

Les extrémités des masselottes 4a, 4b qui font saillie hors du barillet 1a prennent appui contre une couronne circulaire 5.The ends of the weights 4a, 4b protruding out of the barrel 1a bear against a circular ring 5.

Comme on le voit à la figure 3, cette couronne est excentrée par rapport à l'axe XX.As we see in figure 3 , this ring is eccentric with respect to the axis XX.

Cette pompe est destinée à être entraînée à de très grandes vitesses, de l'ordre de 25.000 t/m.This pump is intended to be driven at very high speeds, of the order of 25,000 t / m.

A de telles vitesses, les masselottes 4a, 4b sont écartées de l'axe XX par la force centrifuge et sont ramenées vers le centre par la couronne 5, qui est excentrée : ce mouvement de va et vient des masselottes 4a, 4b provoque un effet de pompage, lesdites masselottes faisant office de pistons.At such speeds, the weights 4a, 4b are spaced from the axis XX by the centrifugal force and are brought towards the center by the ring 5, which is eccentric: this movement back and forth of the weights 4a, 4b causes an effect pumping, said weights acting as pistons.

Il faut que le liquide hydraulique puisse rentrer dans les alésages 2 lors du mouvement d'écartement des masselottes/pistons 4 et puisse être évacué sous pression lorsque ces masselottes/pistons 4 sont repoussées par la couronne 5.It is necessary that the hydraulic liquid can enter the bores 2 during the movement of separation of the weights / pistons 4 and can be evacuated under pressure when these weights / pistons 4 are pushed by the ring 5.

Dans ce but, les alésages 2a et 2b sont reliés, chacun, par une conduite 6a, 6b à une chambre 7 dans laquelle arrive le liquide hydraulique par une conduite d'admission 8.For this purpose, the bores 2a and 2b are each connected by a pipe 6a, 6b to a chamber 7 in which the hydraulic liquid arrives via an intake pipe 8.

Un collecteur de refoulement 9 est appliqué par un ressort 10, contre la face arrière plane 11 de la partie arrière 1 a du barillet 1.A discharge manifold 9 is applied by a spring 10 against the flat rear face 11 of the rear portion 1a of the barrel 1.

L'extrémité dudit collecteur de refoulement 9 qui est en appui contre la face 11, comporte une coupelle cylindrique 12, qui communique avec une canalisation de sortie 13.The end of said discharge manifold 9 which bears against the face 11, comprises a cylindrical cup 12, which communicates with an outlet pipe 13.

Comme cela est indiqué sur la figure 2 par la ligne brisée Z, l'axe de la coupelle 12 est excentré par rapport à l'axe XX du barillet 1.As indicated on the figure 2 by the broken line Z, the axis of the cup 12 is eccentric with respect to the axis XX of the barrel 1.

Comme on le voit en comparant les figures 2 et 3 il en résulte que, lorsque le barillet 1 exécute une rotation, dans un premier temps, un demi-tour, pendant que le piston 4a s'écarte, sous l'effet de la force centrifuge, la canalisation 6a communique avec la chambre 7 et le liquide hydraulique est aspiré dans l'alésage 2a ; puis dans un deuxième temps, deuxième demi-tour, lorsque le piston 4a est repoussé par la couronne 5, qui est excentrée, le liquide est refoulé de l'alésage 2a, par la canalisation 6a qui se trouve, alors, en correspondance avec la coupelle 12, du fait de l'excentration de celle-ci.As can be seen by comparing the figures 2 and 3 as a result, when the cylinder 1 executes a rotation, in a first step, a half-turn, while the piston 4a departs, under the effect of the centrifugal force, the pipe 6a communicates with the chamber 7 and the hydraulic liquid is sucked into the bore 2a; then in a second step, second half-turn, when the piston 4a is pushed by the ring 5, which is eccentric, the liquid is discharged from the bore 2a, through the pipe 6a which is, then, in correspondence with the cup 12, because of the eccentricity thereof.

On obtient ainsi, à chaque tour, aspiration puis refoulement du liquide hydraulique.Thus, at each turn, suction and discharge of the hydraulic fluid.

Il est par ailleurs aisé d'agir sur l'excentricité de la couronne 5 et d'obtenir ainsi une pompe à cylindrée variable.It is also easy to act on the eccentricity of the ring 5 and thus obtain a variable displacement pump.

De préférence, la couronne 5 est constituée par un roulement, les extrémités des pistons 4 étant en appui contre la bague intérieure dudit roulement.Preferably, the ring 5 is constituted by a bearing, the ends of the pistons 4 being in abutment against the inner ring of said bearing.

Cette couronne intérieure est entraînée en rotation par l'appui exercé par les pistons, avec un léger glissement de ceux-ci.This inner ring is rotated by the support exerted by the pistons, with a slight sliding thereof.

Une pompe, telle que celle représentée aux figures 1 à 3, peut être entraînée jusqu'à 20.000 t/m et plus sans qu'il soit nécessaire de pressuriser l'alimentation de la pompe et elle peut fournir jusqu'à 700 bars de pression.A pump, such as the one shown in Figures 1 to 3 , can be driven up to 20,000 rpm and more without the need to pressurize the pump supply and can supply up to 700 bar pressure.

Tous les efforts sont des efforts radiaux, ce qui permet d'employer des moyens usuels, peu chers, pour assurer l'étanchéité.All efforts are radial forces, which allows to use the usual means, inexpensive, to seal.

De préférence le collecteur 9 est constitué pour être hydrostatiquement équilibré, la surface de sa face arrière étant légèrement supérieure à celle de la coupelle 12, le ressort 10 ayant seulement pour but de garantir un fonctionnement correct sans pression ou à très faible pression de refoulement.Preferably the collector 9 is constituted to be hydrostatically balanced, the surface of its rear face being slightly greater than that of the cup 12, the spring 10 for the sole purpose of ensuring proper operation without pressure or very low discharge pressure.

Dans l'exemple représenté, le barillet 1 est traversé par un seul alésage 2, mais il est possible de disposer plusieurs alésages munis chacun de deux pistons.In the example shown, the barrel 1 is traversed by a single bore 2, but it is possible to have several bores each provided with two pistons.

La présente invention permet de réaliser avec des moyens mécaniques simples et peu coûteux une pompe ayant des qualités remarquables.The present invention makes it possible to realize with simple and inexpensive mechanical means a pump having remarkable qualities.

Claims (3)

  1. Spring barrel pump of the type in which the pistons (4) move into bores (2a,2b) provided through said spring barrel (1), diametrically to its axis (XX), by moving away under the effect of the centrifugal force and by drawing closer by resting on an eccentric ring (5), characterized by the fact that said bores (2a, 2b) communicate: on the one hand, with the supply duct (8) by means of ducts (6a, 6b) opening into a chamber (7) that is located behind the spring barrel (1) into which said duct (8) opens; on the other hand, with the conveyor duct (13) by means of a collector (9), applied against the rear surface (11) of the spring barrel (1) by a spring (10), whereby this collector (9) is equipped with a cup (12) that communicates with said conveyor duct (13); whereby said collector (9) is eccentric relative to the axis (XX) of the spring barrel (1), such that each of the ducts (6a, 6b) opens into the chamber (7) during a half-turn and into the cup (12) during a half-turn.
  2. Pump according to claim 1, wherein the collector (9) is balanced hydrostatically so as to be kept — by pressure — resting against the rear surface (11) of the spring barrel (1).
  3. Pump according to claim 1, wherein the pump is a variable-capacity pump.
EP07290798A 2006-07-26 2007-06-27 Improvement for radial piston pumps Active EP1887222B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0606863A FR2904380A1 (en) 2006-07-26 2006-07-26 Pump e.g. spring barrel pump, has collector equipped with cup that communicates with conveyor duct, where collector is eccentric relative to axis of spring barrel, such that each of ducts empties into chamber during half-turn

Publications (2)

Publication Number Publication Date
EP1887222A1 EP1887222A1 (en) 2008-02-13
EP1887222B1 true EP1887222B1 (en) 2009-10-28

Family

ID=37507865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07290798A Active EP1887222B1 (en) 2006-07-26 2007-06-27 Improvement for radial piston pumps

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US (1) US20080025850A1 (en)
EP (1) EP1887222B1 (en)
DE (1) DE602007002954D1 (en)
FR (1) FR2904380A1 (en)

Families Citing this family (1)

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

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1378546A (en) * 1972-06-20 1974-12-27 Hydrostatic Transmissions Ltd Fluid pressure machines
DE2341013C2 (en) * 1973-08-14 1982-08-05 Alfred Teves Gmbh, 6000 Frankfurt Radial piston pump
FR2365041A1 (en) * 1976-09-21 1978-04-14 Poclain Hydraulics Sa MULTI-CYLINDER HYDRAULIC MECHANISM
GB2014648A (en) * 1978-02-17 1979-08-30 Lucas Industries Ltd A Pump for Liquids
DE3121529A1 (en) * 1981-05-29 1982-12-23 Alfred Teves Gmbh, 6000 Frankfurt RADIAL PISTON MACHINE, IN PARTICULAR RADIAL PISTON PUMP
DE3121527A1 (en) * 1981-05-29 1982-12-23 Alfred Teves Gmbh, 6000 Frankfurt RADIAL PISTON MACHINE, IN PARTICULAR RADIAL PISTON PUMP
DE3121528A1 (en) * 1981-05-29 1983-01-05 Alfred Teves Gmbh, 6000 Frankfurt RADIAL PISTON MACHINE, IN PARTICULAR BALL PISTON PUMP
DE3139561A1 (en) * 1981-10-05 1983-04-21 Alfred Teves Gmbh, 6000 Frankfurt RADIAL PISTON MACHINE, IN PARTICULAR BALL PISTON PUMP
FR2588616B1 (en) * 1985-10-16 1988-01-08 Poclain Hydraulics Sa MECHANISM, PUMP MOTOR, HAVING AT LEAST TWO SEPARATE ACTIVE CYLINDERS.
DE3607351A1 (en) * 1986-03-06 1987-09-10 Teves Gmbh Alfred RADIAL PISTON PUMP
DE3628769A1 (en) * 1986-08-25 1988-03-10 Teves Gmbh Alfred Radial piston pump
JPS64367A (en) * 1987-03-02 1989-01-05 Nippon Denso Co Ltd Radial piston pump
US5477680A (en) * 1994-09-13 1995-12-26 Burndy Corporation Motor driven hydraulic tool with variable displacement hydraulic pump
DE19504380C2 (en) * 1995-01-05 1997-03-13 Linear Anstalt Pump for conveying a medium
GB9611588D0 (en) * 1996-06-04 1996-08-07 Lucas Ind Plc Rotary pump and cam ring therefor
US5769611A (en) * 1996-09-06 1998-06-23 Stanadyne Automotive Corp. Hydraulic pressure supply pump with multiple sequential plungers
DE19843120C1 (en) * 1998-09-21 1999-12-30 Bosch Gmbh Robert Adjustable radial piston pump or motor
NL1012151C2 (en) * 1999-05-25 2000-11-28 Applied Power Inc Radial plunger machine, especially a radial plunger pump.
DE10118884A1 (en) * 2001-04-18 2002-11-07 Bosch Gmbh Robert High-pressure fuel pump for a fuel system of a direct-injection internal combustion engine, fuel system and internal combustion engine
JP2004132196A (en) * 2002-10-08 2004-04-30 Komatsu Ltd Radial type fluid machine

Also Published As

Publication number Publication date
FR2904380A1 (en) 2008-02-01
DE602007002954D1 (en) 2009-12-10
US20080025850A1 (en) 2008-01-31
EP1887222A1 (en) 2008-02-13

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