EP0814265A1 - Hydraulic pump with noise reduction - Google Patents

Hydraulic pump with noise reduction Download PDF

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Publication number
EP0814265A1
EP0814265A1 EP97401387A EP97401387A EP0814265A1 EP 0814265 A1 EP0814265 A1 EP 0814265A1 EP 97401387 A EP97401387 A EP 97401387A EP 97401387 A EP97401387 A EP 97401387A EP 0814265 A1 EP0814265 A1 EP 0814265A1
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EP
European Patent Office
Prior art keywords
pump
pump body
auxiliary
cavity
auxiliary pump
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.)
Withdrawn
Application number
EP97401387A
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German (de)
French (fr)
Inventor
Didier Grattery
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.)
Hydroperfect International Inc
Original Assignee
Hydroperfect International Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hydroperfect International Inc filed Critical Hydroperfect International Inc
Publication of EP0814265A1 publication Critical patent/EP0814265A1/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
    • F04C15/0049—Equalization of pressure pulses

Definitions

  • the present invention relates to a new hydraulic pump with damping capacity.
  • the invention extends, more particularly, to gear pumps in which two engaged pinions are driven to raise the pressure of a hydraulic fluid which is discharged towards a circuit of use.
  • the work produced by the pinions, which constitute the moving gear assembly, has the effect of generating pulsations due to the non-linear work produced in the intents of the pinions.
  • the pulsations produced have the effect of generating pump noises that are difficult to remove even with thick-walled bodies and receiver noises, the intensity of which depends on the performance of the high-pressure oil transmission pipes.
  • GB-A-2 036 873 provides a solid body in which the gables or other elements ensuring the elevation of the walls are contained in a space leading to a chamber provided in the same body. This arrangement requires complex machining in the pump body in order to both contain the movable element or elements, delimit at least one damping chamber and provide conduits between the cavities containing the movable element of the damping chamber and the inlet and outlet pipes of the pump.
  • GB-A-2 277 963 provides, to reduce the noise due to the operation of a pump, a substantially annular conduit at the periphery of the pump body, this conduit leading to a chamber provided in a cover attached to one side of the body of the pump. pump and drilled to allow passage to a mobile crew drive shaft.
  • DE-A-41 20 757 relates to a hydraulic machine in which the hydraulic fluid circulates in damping chambers which are located on either side of a rotor in parts attached laterally to the body containing the rotor.
  • this embodiment also, it is necessary to design attachments to the pump body and to machine them in a particularly complex manner to reduce the pulsations produced, which significantly increases the cost of producing the pump.
  • the main object of the invention is to reduce, or even almost completely eliminate, the pulsations generated by the operation of a hydraulic pump by using a damping cavity but without there being any need for costly machining, nor to complex assemblies, which makes it possible to produce efficient, silent and low-cost hydraulic pumps.
  • the hydraulic pump with damping capacity in which the pump body which contains the movable element between bearings is supported by a sole, is characterized in that said pump body is tightly connected to an analogous auxiliary pump body not fitted with a moving element and into the cavity of which the outlet pipe of the pump body provided with the moving element opens.
  • Fig. 1 is a sectional elevation, seen along line I-I of FIG. 2, a hydraulic pump fitted with the pulsation damper of the invention.
  • Fig. 2 is a section taken along line II-II of FIG. 1.
  • Fig. 3 is a cross section seen along line III-III of FIG. 1.
  • Fig. 4 is a cross section seen along line IV-IV of FIG. 1.
  • a soleplate 1 supports a hydraulic pump body 2, the moving assembly 3 of which, in this case pinions, is rotatably supported between bearings 4, 5 and bearings for supporting a shaft training 6.
  • the hydraulic fluid is brought to the moving element 3 by an intake duct 7 and is discharged by an outlet duct 8 communicating with a channel 9 of a closure plate 10 extending parallel to the sole 1.
  • the plate closure 10 is, moreover, fixed to an auxiliary pump body 11 produced by a part identical to the pump body 2 but containing neither movable equipment, nor bearing or bearing so that this auxiliary pump body delimits a discharge cavity 12 of large volume, the conduit 13 which passes through the wall leads to a discharge pipe, not shown.
  • the auxiliary pump body 11 is itself closed by a closure plate 14 constituted by a cover such as that normally used for closing the pump body 2 when the latter is not provided with a pump body auxiliary 11.
  • the drawing shows the cells 14a which have the interior of a usual cover.
  • the pump bodies 2 and 11 are, moreover, provided with seals 16, 17 bearing against the plate 10 to prevent any leakage.
  • the plate 10 additionally serves to hold a calibrated tube 18 which opens into the cavity 12 into which the hydraulic fluid coming from the outlet conduit 8 is brought.
  • the presence of the cavity 12 supplied by the calibrated tube 18 has the effect of both damping the pulsations generated within the hydraulic fluid during its rise in pressure by the moving assembly 3 so that a flow is thus obtained regular undisturbed from the duct 13, this undisturbed flow being due to the combined action of the cavity 12 substantially of ovoid shape, of the cells 14a and of the calibrated tube 18 but also to the mass which the auxiliary pump body 11 presents which is identical to the pump body 2, the thicknesses of the walls of which are normally chosen to withstand high forces due to the presence and maintenance of the moving element 3 and bearings 4, 5.
  • the length and section of the calibrated tube 18 can vary according to the characteristics specific to each application.

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

Abstract

The body (2) of the hydraulic pump which contains the movable gearing (3) between bearings (4,5) is supported by a base plate (1). The pump body is connected to an auxiliary pump body (11) by bolts. The auxiliary pump does not have any gearing and the gear pump outlet pipe (8) discharges into the auxiliary pump cavity (12). The outlet pipe is connected to the cavity by a calibrated tube (18). The gear pump is separated from the auxiliary pump by a closing plate (10). The two pump bodies are connected by bolts (15). The auxiliary pump is closed by a cover (14).

Description

La présente invention concerne une nouvelle pompe hydraulique à capacité d'amortissement.The present invention relates to a new hydraulic pump with damping capacity.

L'invention s'étend, plus particulièrement, aux pompes à engrenage dans lesquelles deux pignons en prise sont entraînés pour élever la pression d'un fluide hydraulique qui est refoulé vers un circuit d'utilisation.The invention extends, more particularly, to gear pumps in which two engaged pinions are driven to raise the pressure of a hydraulic fluid which is discharged towards a circuit of use.

Le travail produit par les pignons, qui constituent l'équipage mobile à engrenage, a pour effet d'engendrer des pulsations dues au travail non linéaire produit dans les entredents des pignons. Les pulsations produites ont pour effet de générer des bruits de pompe difficiles à faire disparaître même avec des corps à parois épaisses et des bruits de récepteurs dont l'intensité est fonction des performances des tuyaux de transmission d'huile haute pression.The work produced by the pinions, which constitute the moving gear assembly, has the effect of generating pulsations due to the non-linear work produced in the intents of the pinions. The pulsations produced have the effect of generating pump noises that are difficult to remove even with thick-walled bodies and receiver noises, the intensity of which depends on the performance of the high-pressure oil transmission pipes.

L'art antérieur a recherché différents moyens pour réduire les bruits ainsi engendrés.The prior art has sought different means to reduce the noise thus generated.

GB-A-2 036 873 prévoit un corps massif dans lequel les pignons ou autres éléments assurant l'élévation des parois sont contenus dans une espace menant à une chambre prévue dans le même corps. Cette disposition nécessite des usinages complexes dans le corps de pompe pour, à la fois contenir le ou les équipages mobiles, délimiter au moins une chambre d'amortissement et prévoir des conduits entre les cavités contenant l'équipage mobile de la chambre d'amortissement et les conduits d'entrée et de sortie de la pompe.GB-A-2 036 873 provides a solid body in which the gables or other elements ensuring the elevation of the walls are contained in a space leading to a chamber provided in the same body. This arrangement requires complex machining in the pump body in order to both contain the movable element or elements, delimit at least one damping chamber and provide conduits between the cavities containing the movable element of the damping chamber and the inlet and outlet pipes of the pump.

GB-A-2 277 963 prévoit, pour réduire les bruits dus au fonctionnement d'une pompe, un conduit sensiblement annulaire à la périphérie du corps de pompe, ce conduit menant à une chambre prévue dans un couvercle accolé sur un côté du corps de pompe et percé pour laisser le passage à un arbre d'entraînement de l'équipage mobile. Ainsi, dans cette disposition, il y a lieu de réaliser plusieurs pièces et d'assurer l'étanchéité entre elles et également l'étanchéité avec l'arbre d'entraînement, ce qui conduit à des usinages complexes.GB-A-2 277 963 provides, to reduce the noise due to the operation of a pump, a substantially annular conduit at the periphery of the pump body, this conduit leading to a chamber provided in a cover attached to one side of the body of the pump. pump and drilled to allow passage to a mobile crew drive shaft. Thus, in this arrangement, it is necessary to make several parts and to seal between them and also sealing with the drive shaft, which leads to complex machining.

DE-A-41 20 757 concerne une machine hydraulique dans laquelle le fluide hydraulique circule dans des chambres d'amortissement qui se trouvent de part et d'autre d'un rotor dans des parties rapportées latéralement au corps contenant le rotor. Dans cette réalisation encore, il est nécessaire de concevoir des pièces rapportées au corps de pompe et de les usiner d'une manière particulièrement complexe pour réduire les pulsations produites, ce qui augmente sensiblement le prix de réalisation de la pompe.DE-A-41 20 757 relates to a hydraulic machine in which the hydraulic fluid circulates in damping chambers which are located on either side of a rotor in parts attached laterally to the body containing the rotor. In this embodiment also, it is necessary to design attachments to the pump body and to machine them in a particularly complex manner to reduce the pulsations produced, which significantly increases the cost of producing the pump.

L'invention a pour objet principal de réduire, voire supprimer presque complètement, les pulsations engendrées par le fonctionnement d'une pompe hydraulique en mettant en oeuvre une cavité d'amortissement mais sans qu'il y ait lieu de procéder à des usinages coûteux, ni à des assemblages complexes, ce qui rend possible la réalisation de pompes hydrauliques efficaces, silencieuses et d'un faible coût de revient.The main object of the invention is to reduce, or even almost completely eliminate, the pulsations generated by the operation of a hydraulic pump by using a damping cavity but without there being any need for costly machining, nor to complex assemblies, which makes it possible to produce efficient, silent and low-cost hydraulic pumps.

Conformément à l'invention, la pompe hydraulique à capacité d'amortissement, dans laquelle le corps de pompe qui contient l'équipage mobile entre des coussinets est supporté par une semelle, est caractérisée en ce que ledit corps de pompe est relié de façon étanche à un corps de pompe auxiliaire analogue non muni d'équipage mobile et dans la cavité duquel débouche le conduit de sortie du corps de pompe muni de l'équipage mobile.According to the invention, the hydraulic pump with damping capacity, in which the pump body which contains the movable element between bearings is supported by a sole, is characterized in that said pump body is tightly connected to an analogous auxiliary pump body not fitted with a moving element and into the cavity of which the outlet pipe of the pump body provided with the moving element opens.

Diverses autres caractéristiques de l'invention ressortent d'ailleurs de la description détaillée qui suit.Various other characteristics of the invention will also emerge from the detailed description which follows.

Une forme de réalisation de l'objet de l'invention est représentée, à titre d'exemple non limitatif, au dessin annexé.An embodiment of the object of the invention is shown, by way of nonlimiting example, in the accompanying drawing.

La fig. 1 est une coupe-élévation, vue suivant la ligne I-I de la fig. 2, d'une pompe hydraulique munie de l'amortisseur de pulsations de l'invention.Fig. 1 is a sectional elevation, seen along line I-I of FIG. 2, a hydraulic pump fitted with the pulsation damper of the invention.

La fig. 2 est une coupe prise suivant la ligne II-II de la fig. 1.Fig. 2 is a section taken along line II-II of FIG. 1.

La fig. 3 est une coupe transversale vue suivant la ligne III-III de la fig. 1.Fig. 3 is a cross section seen along line III-III of FIG. 1.

La fig. 4 est une coupe transversale vue suivant la ligne IV-IV de la fig. 1.Fig. 4 is a cross section seen along line IV-IV of FIG. 1.

Comme le montre le dessin, une semelle 1 supporte un corps de pompe hydraulique 2 dont l'équipage mobile 3, en l'occurrence des pignons, est supporté à rotation entre des coussinets 4, 5 et des paliers pour le support d'un arbre d'entraînement 6.As shown in the drawing, a soleplate 1 supports a hydraulic pump body 2, the moving assembly 3 of which, in this case pinions, is rotatably supported between bearings 4, 5 and bearings for supporting a shaft training 6.

Le liquide hydraulique est amené à l'équipage mobile 3 par un conduit d'admission 7 et est refoulé par un conduit de sortie 8 communiquant avec un canal 9 d'une plaque de fermeture 10 s'étendant parallèlement à la semelle 1. La plaque de fermeture 10 est, par ailleurs, fixée à un corps de pompe auxiliaire 11 réalisé par une pièce identique au corps de pompe 2 mais ne contenant ni équipage mobile, ni coussinet ou palier afin que ce corps de pompe auxiliaire délimite une cavité 12 de refoulement de grand volume dont le conduit 13 qui traverse la paroi mène à une tubulure de refoulement non représentée.The hydraulic fluid is brought to the moving element 3 by an intake duct 7 and is discharged by an outlet duct 8 communicating with a channel 9 of a closure plate 10 extending parallel to the sole 1. The plate closure 10 is, moreover, fixed to an auxiliary pump body 11 produced by a part identical to the pump body 2 but containing neither movable equipment, nor bearing or bearing so that this auxiliary pump body delimits a discharge cavity 12 of large volume, the conduit 13 which passes through the wall leads to a discharge pipe, not shown.

Le corps de pompe auxiliaire 11 est lui-même fermé par une plaque de fermeture 14 constituée par un couvercle tel que celui utilisé normalement pour la fermeture du corps de pompe 2 lorsque celui-ci n'est pas muni d'un corps de pompe auxiliaire 11. Le dessin montre les alvéoles 14a qui présentent l'intérieur d'un couvercle usuel.The auxiliary pump body 11 is itself closed by a closure plate 14 constituted by a cover such as that normally used for closing the pump body 2 when the latter is not provided with a pump body auxiliary 11. The drawing shows the cells 14a which have the interior of a usual cover.

Le maintien des corps de pompe 2 et 11 ainsi que des couvercles 10 et 14 est assuré par des boulons 15 ou autres organes de fixation appropriés.The retention of the pump bodies 2 and 11 as well as of the covers 10 and 14 is ensured by bolts 15 or other suitable fixing members.

Les corps de pompe 2 et 11 sont, par ailleurs, munis de joints d'étanchéité 16, 17 prenant appui contre la plaque 10 pour éviter toute fuite.The pump bodies 2 and 11 are, moreover, provided with seals 16, 17 bearing against the plate 10 to prevent any leakage.

La plaque 10 sert supplémentairement au maintien d'un tube calibré 18 qui débouche dans la cavité 12 dans laquelle est amené le fluide hydraulique provenant du conduit de sortie 8.The plate 10 additionally serves to hold a calibrated tube 18 which opens into the cavity 12 into which the hydraulic fluid coming from the outlet conduit 8 is brought.

La présence de la cavité 12 alimentée par le tube calibré 18 a pour effet à la fois d'amortir les pulsations engendrées au sein du fluide hydraulique lors de son élévation en pression par l'équipage mobile 3 de sorte qu'on obtient ainsi un écoulement régulier non perturbé à partir du conduit 13, cet écoulement non perturbé étant dû à l'action combinée de la cavité 12 sensiblement de forme ovoïde, des alvéoles 14a et du tube calibré 18 mais aussi à la masse que présente le corps de pompe auxiliaire 11 qui est identique au corps de pompe 2 dont les épaisseurs des parois sont normalement choisies pour supporter des efforts élevés dus à la présence et au maintien de l'équipage mobile 3 et coussinets 4, 5. La longueur et la section du tube calibré 18 peuvent varier en fonction des caractéristiques spécifiques à chaque application.The presence of the cavity 12 supplied by the calibrated tube 18 has the effect of both damping the pulsations generated within the hydraulic fluid during its rise in pressure by the moving assembly 3 so that a flow is thus obtained regular undisturbed from the duct 13, this undisturbed flow being due to the combined action of the cavity 12 substantially of ovoid shape, of the cells 14a and of the calibrated tube 18 but also to the mass which the auxiliary pump body 11 presents which is identical to the pump body 2, the thicknesses of the walls of which are normally chosen to withstand high forces due to the presence and maintenance of the moving element 3 and bearings 4, 5. The length and section of the calibrated tube 18 can vary according to the characteristics specific to each application.

L'invention n'est pas limitée à l'exemple de réalisation, représenté et décrit en détail, car diverses modifications peuvent y être apportées sans sortir de son cadre.The invention is not limited to the embodiment, shown and described in detail, because various modifications can be made without departing from its scope.

Claims (8)

Pompe hydraulique à capacité d'amortissement dans laquelle le corps de pompe (2) qui contient l'équipage mobile (3) entre des coussinets (4, 5) est supporté par une semelle (1), caractérisée en ce que ledit corps de pompe (2) est relié, de façon étanche, à un corps de pompe auxiliaire analogue (11) non muni d'équipage mobile et dans la cavité (12) duquel débouche le conduit de sortie (8) du corps de pompe (2) muni de l'équipage mobile.Hydraulic pump with damping capacity in which the pump body (2) which contains the movable assembly (3) between bearings (4, 5) is supported by a sole (1), characterized in that said pump body (2) is connected, in a leaktight manner, to a similar auxiliary pump body (11) not fitted with a moving element and into the cavity (12) from which the outlet conduit (8) of the pump body (2) provided of the moving crew. Pompe suivant la revendication 1, caractérisée en ce que le conduit de sortie (8) du corps de pompe (2) est relié à la cavité (12) du corps de pompe auxiliaire par un tube calibré (18).Pump according to claim 1, characterized in that the outlet pipe (8) of the pump body (2) is connected to the cavity (12) of the auxiliary pump body by a calibrated tube (18). Pompe suivant l'une des revendications 1 et 2, caractérisée en ce que le corps de pompe (2) est séparé du corps de pompe auxiliaire (11) par une plaque de fermeture (10).Pump according to either of Claims 1 and 2, characterized in that the pump body (2) is separated from the auxiliary pump body (11) by a closing plate (10). Pompe suivant l'une des revendications 1 à 3, caractérisée en ce que les corps de pompe (2, 11) sont reliés par des boulons (15) ou autres organes de fixation.Pump according to one of claims 1 to 3, characterized in that the pump bodies (2, 11) are connected by bolts (15) or other fixing members. Pompe suivant l'une des revendications 1 à 4, caractérisée en ce que les corps de pompe (2, 11) sont identiques.Pump according to one of Claims 1 to 4, characterized in that the pump bodies (2, 11) are identical. Pompe suivant la revendication 1, caractérisé en ce que le corps de pompe auxiliaire présente une cavité (12) sensiblement de forme ovoïde.Pump according to claim 1, characterized in that the auxiliary pump body has a cavity (12) substantially of ovoid shape. Pompe suivant les revendications 1 et 6, caractérisée en ce que le corps de pompe auxiliaire est fermé par un couvercle (14) présentant des alvéoles (14a).Pump according to claims 1 and 6, characterized in that the auxiliary pump body is closed by a cover (14) having cells (14a). Pompe suivant la revendication 2, caractérisée en ce que le tube calibré (18) est de longueur et section variable en fonction des caractéristiques spécifiques de chaque application.Pump according to claim 2, characterized in that the calibrated tube (18) is of variable length and section in according to the specific characteristics of each application.
EP97401387A 1996-06-18 1997-06-17 Hydraulic pump with noise reduction Withdrawn EP0814265A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9607542 1996-06-18
FR9607542A FR2749886B1 (en) 1996-06-18 1996-06-18 HYDRAULIC PUMP WITH DAMPING CAPACITY

Publications (1)

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EP0814265A1 true EP0814265A1 (en) 1997-12-29

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EP97401387A Withdrawn EP0814265A1 (en) 1996-06-18 1997-06-17 Hydraulic pump with noise reduction

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2036873A (en) * 1978-12-01 1980-07-02 South Western Ind Res Silencing Fluid Pumps and Motors
DE4120757A1 (en) * 1990-06-25 1992-01-02 Zahnradfabrik Friedrichshafen Sliding vane fluid pump - has damping chambers in housing which reduce noise and pressure pulsations

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2036873A (en) * 1978-12-01 1980-07-02 South Western Ind Res Silencing Fluid Pumps and Motors
DE4120757A1 (en) * 1990-06-25 1992-01-02 Zahnradfabrik Friedrichshafen Sliding vane fluid pump - has damping chambers in housing which reduce noise and pressure pulsations

Also Published As

Publication number Publication date
FR2749886B1 (en) 1998-09-11
FR2749886A1 (en) 1997-12-19

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