EP3037664B1 - Variable rate oil pump - Google Patents

Variable rate oil pump Download PDF

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Publication number
EP3037664B1
EP3037664B1 EP15200252.3A EP15200252A EP3037664B1 EP 3037664 B1 EP3037664 B1 EP 3037664B1 EP 15200252 A EP15200252 A EP 15200252A EP 3037664 B1 EP3037664 B1 EP 3037664B1
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EP
European Patent Office
Prior art keywords
ring
circular
contour
circular guide
guide contour
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EP15200252.3A
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German (de)
French (fr)
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EP3037664A1 (en
Inventor
Régis TREMINO
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Renault SAS
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Renault SAS
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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
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
    • F04C14/226—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam by pivoting the cam around an eccentric axis
    • 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/3441—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation

Definitions

  • the subject of the invention is oil pumps, and more particularly variable displacement oil pumps such as oil pumps comprising a mobile ring surrounding the rotor.
  • oil pumps may be used to lubricate the members of a power train, for example a power train of an electric motor vehicle comprising an internal combustion engine.
  • Such oil pumps make it possible, for example, to adapt the oil flow of these members according to the vehicle running conditions, for members such as camshaft phase shifters, valve lever actuators or pushers. variables.
  • such pumps typically driven by a crankshaft axis of the engine, must be able to adapt their flow rate not only according to the speed of rotation of the engine, but also according to other driving parameters.
  • variable flow pump is for example described in the patent application FR 2852354 , wherein the ratio of incoming flow to outflow of the pump is changed by means of a movable ring surrounding the rotor, which is displaced relative to the rotor about a pivot axis at the periphery of the rotor. the ring.
  • the displacement of the ring varies the volume available for the admission of the oil into the pump and the volume available for the expulsion of the oil out of the pump. Due to the presence of the mechanisms for moving the ring, the size of such a pump is much larger than the size of the chamber inside which the pallets move.
  • the document also proposes a variant in which the ring is moved in translation, and for which the size of the pump is substantially circular, but the total diameter of the assembly is also substantially greater than the useful volume of the chamber. oil surrounding the rotor.
  • the pivoting movement is typically applied by means of a pusher pressing a protrusion of the ring, diametrically opposed to the position of the pivot axis.
  • a compression spring serves as an elastic return element to bring the protrusion back to its rest position.
  • the pusher and the spring extend laterally on either side of the outer diameter of the ring, contributing to the overall bulk by a volume which is almost of the same order as that of the ring.
  • the object of the invention is to propose a variable flow pump, which makes it possible in a reduced volume, preferably circular, to offer the wide possibilities of variation of the flow ratio between the inlet and the outlet of the pump.
  • the invention proposes a variable flow oil pump, in particular for a motor vehicle engine element, comprising a pump housing and a rotor with radially movable vanes, configured to rotate inside a circular chamber imposing the radial position of the vanes.
  • the chamber is defined within a movable ring configured to be pivotable relative to the pump housing about an axis of rotation of the ring, so as to modify the eccentricity of the chamber relative to the rotor axis.
  • the axis of rotation of the ring passes through the circular chamber.
  • the housing may comprise a first circular guiding contour, the ring having a portion of first outer contour complementary to the first circular guide contour and centered on the axis of rotation of the ring.
  • the first outer contour portion may surround the circular chamber and the circular chamber may be eccentric with respect to the first outer contour (that is, the chamber may be eccentric to the center of rotation of the ring).
  • the pump housing may comprise a second circular guide contour of the same axis as the first circular guide contour, and extending radially and / or axially beyond the first circular guide contour.
  • the ring may comprise at minus a second outer contour portion configured to move along the second circular guide contour.
  • the angular extent of the portion or portions of the second outer contour of the ring may be strictly less than the angular extent of the second outer contour of the housing.
  • the portion or portions of the second outer contour of the ring can thus move circumferentially along the second outer contour of the housing while keeping a constant angular bearing width during rotation of the ring and / or in order to abut with the housing for two extreme positions limiting the rotation of the ring.
  • the second circular guide contour may be of greater diameter than the first circular guide contour, and the ring may comprise at least one radial rib extending radially between the portion (s) of the first outer contour and the portion or portions (s) second outer contour.
  • the second circular guide contour has at least one portion extending axially out of the axial extent of the first circular guide contour, and the ring comprises at least one radial rib extending axially in a volume defined by the second circular guide contour.
  • the pump may comprise at least one control chamber that can receive an oil pressure so as to rotate the ring, and delimited at least partly by the second circular contour for guiding the housing, and a radial rib of the 'ring
  • the pump may comprise at least two control chambers on either side of the same radial rib.
  • the pump may comprise at least one elastic return means of the ring in rotation, resting on a radial rib of the ring.
  • At least one radial rib may extend to the second circular guide contour. Such a rib may thus delimit at least one control chamber. According to an embodiment that can be to combine with the preceding, at least one rib may be of smaller radial extent than the second circular guide contour, for example if this rib serves to contain an elastic return means
  • the invention also proposes a power unit comprising an internal combustion engine, and comprising an oil pump according to the above-described method, the rotor of the oil pump being driven by a crankshaft axis of the engine, the crankshaft axis driving in addition, a pulley with a diameter greater than the ring and axially covering at least partly a portion of the pump housing.
  • circular elements we mean in the present text, elements that are of revolution about an axis.
  • the circular elements described are defined by cylinder portions of revolution axis parallel to the axis of rotation of the rotor. It is possible to envisage non-cylindrical variants of embodiment, the inner and outer walls of the ring, the housing of the ring, the ends of the pallets, being for example defined by portions of sphere, portions of spheres that can be limited between an upper plane and a lower plane parallel to each other.
  • a pump according to the invention comprises a pump housing 15 which can also house other engine components, and in which is arranged an oil supply channel 17 arriving at a circular recess 23, and a oil leaving 18 starting from this circular recess 23, to bring the oil to a mechanical member to lubricate.
  • a movable ring 4 Inside the circular recess 23 is accommodated a movable ring 4, of first outer contour 11 complementary to the circular housing 23, and inside which is formed a circular chamber 2 which is eccentric with respect to the first outer contour 11 of the ring 4.
  • a rotor 1 with vanes, rotating around a geometric axis x.
  • the rotor 1 is equipped with moving vanes 5 which move radially relative to the rotor, for example in radial grooves 16, so as to remain in contact at their outer radial end with the walls of the circular chamber 2, or at least way to move near this wall.
  • the vanes 5 thus circulate around the rotor, inside the circular chamber 2, in the direction of rotation indicated by the arrow 24, the oil contained in the pump.
  • the vanes 5 of the rotor 1 can be held against the wall of the circular chamber 2 by various means.
  • a ring 6 for aligning the vanes of the rotor imposes a radially constant distance between a radially inner point of the vanes and the x axis of the rotor.
  • each rotor blade being able to be provided with a return spring (not shown), interposed between the bottom of the guide grooves 16 and the end of the vanes 5 in order to recall the pallets. 5 radially outward.
  • the movable ring 4 can rotate inside the circular recess 23 about a geometric axis of rotation ⁇ of the ring.
  • the axis ⁇ of the movable ring 4 is at a non-zero distance d from the axis x of rotation of the rotor 1 of the pump.
  • Inside the movable ring 4 is formed the circular chamber 2 of center ⁇ .
  • the center ⁇ of the circular chamber 2 is at a distance e not zero from the axis ⁇ of the movable ring 4.
  • the center ⁇ of the circular chamber 2 is moves relative to the x-axis of the rotor, and the eccentricity of the circular chamber 2 varies with respect to the x-axis of the rotor.
  • the space radially available between the rotor 1 and the periphery of the circular chamber 2 defines a chamber 3 to variable geometry surrounding the rotor, and whose radial section varies around the rotor according to the eccentricity of the circular chamber 2 at this time. It is in this chamber 3 with variable geometry that the vanes 5 of the rotor circulate the oil around the rotor 1.
  • the mobile ring 4, the circular chamber 2, and the rotor 1 may all be limited, axially, substantially by the same lower plane lying below the section plane of the figure, and by the same top plane lying above the section plane of the figure, respectively corresponding to the lower and upper axial limits of the circular chamber 2.
  • the oil supply channel 17 extends radially to the circular chamber 2, or below the plane lower common, either above the common upper plane or, for some embodiments, partly below the common lower plane, and partly above the common upper plane.
  • the encounter zone between the oil supply channel 17 and the variable geometry chamber 3 defines a zone 19 for regulating the flow of oil entering the pump.
  • This control zone 19 The volume of this control zone 19, and therefore the available section for the passage of oil increases when the radial distance between the rotor and the circular chamber 2 increases on the side of the oil intake.
  • the volume of this control zone decreases when this radial distance decreases due to the rotation of the mobile ring 4.
  • the oil outlet channel 18 extends radially towards the rotor 1 to the chamber circular 2, for example below the common lower plane, or above the common upper plane.
  • the outgoing oil flow can be all the more important as the radial distance in this zone 20, between the circular chamber 2 and the rotor 1 is important.
  • the ratio of the oil flow rate to the oil outflow rate varies according to the oil flow section ratios allowed at a given time by the incoming oil flow rate control zone 19 and the zone. 20 to control the flow of oil out of the pump, so depending on the eccentric position of the chamber 2 relative to the rotor 1, in other words according to the position of the center ⁇ of the chamber 2 relative to the center x of the rotor and with respect to the channels 17 and 18 of arrival and departure of oil.
  • the distance e between the center ⁇ of the ring and the center ⁇ of the circular chamber 2 may be equal to the distance d between the center ⁇ of the ring 4 and the axis x of the rotor 1.
  • the mobile ring 4 can then be configured to be placed in an angular position coinciding the center ⁇ of the circular chamber 2 with the axis of rotation x of the rotor.
  • the radial thickness of the variable geometry chamber 3 can then be the same all around the rotor 1. If the section of the oil supply channel 17 and the oil outlet channel 18 are substantially identical, the flow rate of The incoming oil is then in this position of the ring, substantially equal to the oil flow exiting the pump. This iso-flow configuration is not always possible in pump systems where the mobile ring rotates around a point outside the oil circulation chamber, or in which the mobile ring moves in translation. .
  • the rotation of the ring is done by guiding the first outer contour 11 of the ring relative to a first circular guide contour 21 defined by the inner wall of the recess 23 in which is housed the ring.
  • two oil pressure control chambers are defined on either side of a first radial rib 7 extending radially to beyond the first outer contour 11 of the ring 4.
  • An elastic angular reminder of the ring 4 is ensured by a spring 9 interposed between the housing 15, and a second radial rib 8 of the movable ring 4, also extending radially beyond the first outer contour 11 of the ring 4.
  • the radial ends of the rib 7 and rib 8, which form zones of contact with the casing 15, represent portions of the second outer contour of the ring 4. These portions of the second outer contour move in a rotational movement in contact with the casing 15, this time no longer in contact with the first circular guide contour 21 limiting the circular recess 23, but with a second circular guide contour 22, extending radially outside the first circular guide contour 21.
  • circular guiding contours here means contours extending along circular arc portions around the axis ⁇ of rotation of the movable ring 4, these contours being able to extend all around the axis ⁇ , or that can stretch re on one or more angular portions around the axis ⁇ .
  • the radius of the first circular guide contour 21 is preferably constant, and the radius of the second circular guide contour may also be constant.
  • the oil pressure in the regulation chambers 13 and 14 is provided by oil supply channels (not shown) in each of these chambers, the flow rate of which can be regulated either electronically or hydraulically according to known methods.
  • the pressure difference between the regulation chambers 13 and 14 results in a moment of rotation applied to the mobile ring 4, imposing, as a function of the pressure difference involved, a rotational movement of the ring 4 around the ⁇ axis and a deformation of the return spring 9 which is proportional to the pressure difference.
  • Embodiments may be envisaged in which the angular position of the mobile ring 4 is imposed by pressure regulation chambers which are located in a portion of the casing which is outside the axial extent of the mobile ring 4
  • the control chambers may be located above the common upper plane or below the common lower plane.
  • the radial extent of the second guide contour 22 may then be less than or equal to the radial extent of the first contour 21, the movable ring being rotated by ribs which are attached to a radial face of the ring instead of being attached to the circumference of the ring.
  • the invention is not limited to the embodiments described and can be declined in many variants.
  • the axis of the rotor can be driven by another axis than a motor crankshaft axis.
  • the pump may not have a position making coincide the center of the rotor and the center of the circular chamber 2. It is possible to envisage embodiments where, for certain eccentric positions of the circular chamber 2, at least one of the control zones 19 or 20 of entry or exit of oil would not allow any more passage of the oil.
  • the oil pump according to the invention has a reduced radial size, this space being further concentrated in a substantially circular volume.
  • the reduced radial size of this type of pump makes it possible, during the arrangement of different elements of a powertrain between them, to insert at least a part of the volume of the pump into another element of the pump. revolution having a hollow volume, such as the back of an accessory pulley, or the rear of any pulley driven by the pump shaft, which may typically be a crank shaft (10) of a combustion engine internal.
  • the rotation of the movable ring 4 about an axis ⁇ which is close to the x-axis of the rotor has many advantages.
  • the angular extent of displacement of the circular chamber 2 around the x axis of the rotor can be very wide.
  • the substantially circular rotor recess geometries are simple to make.
  • the friction interfaces between the movable ring 4 and the casing 5 are distributed all around the mobile ring thus limiting the drifts of the characteristics of

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Description

L'invention a pour objet les pompes à huile, et plus particulièrement les pompes à huile à débit variable telles que les pompes à huile comportant un anneau mobile entourant le rotor. De telles pompes à huile peuvent être utilisées pour lubrifier les organes d'un groupe motopropulseur, par exemple d'un groupe motopropulseur d'un véhicule automobile électrique comprenant un moteur à combustion interne. De telles pompes à huile permettent par exemple d'adapter le débit d'huile de ces organes en fonction des conditions de roulage du véhicule, pour des organes tels que des déphaseurs d'arbre à came, des actionneurs de lever de soupape ou des poussoirs variables. Dans un groupe motopropulseur, de telles pompes, classiquement entraînées par un axe de vilebrequin du moteur, doivent pouvoir adapter leur débit non seulement en fonction de la vitesse de rotation du moteur, mais également en fonction d'autres paramètres de roulage. Une telle pompe à débit variable est par exemple décrite dans la demande de brevet FR 2852354 , dans laquelle le rapport entre débit entrant et débit sortant de la pompe est modifié à l'aide d'un anneau mobile entourant le rotor, que l'on déplace par rapport au rotor autour d'un axe de pivot situé à la périphérie de l'anneau. Le déplacement de l'anneau fait varier le volume disponible pour l'admission de l'huile dans la pompe et le volume disponible pour l'expulsion de l'huile hors de la pompe. De par la présence des mécanismes de déplacement de l'anneau, l'encombrement d'une telle pompe est nettement plus important que l'encombrement de la chambre à l'intérieur de laquelle se déplacent les palettes. Le document propose aussi une variante dans laquelle l'anneau est déplacé en translation, et pour laquelle l'encombrement de la pompe est sensiblement circulaire, mais le diamètre total de l'ensemble est également sensiblement plus élevé que le volume utile de la chambre d'huile entourant le rotor. Dans la variante où l'anneau pivote autour d'un axe, le mouvement de pivot est typiquement appliqué à l'aide d'un poussoir appuyant sur une excroissance de l'anneau, diamétralement opposée à la position de l'axe de pivot. Un ressort de compression fait office d'élément de retour élastique afin de ramener l'excroissance à sa position de repos. Le poussoir et le ressort s'étendent latéralement de part et d'autre du diamètre extérieur de l'anneau, contribuant à l'encombrement total par un volume qui est presque du même ordre que celui de l'anneau. En outre l'encombrement lié au poussoir, ou au second anneau extérieur dans la version en translation, augmente encore si l'on souhaite disposer d'une course importante de l'anneau mobile afin d'augmenter les variations possible de plage de débit de la pompe. L'invention a pour but de proposer une pompe à débit variable, qui permette dans un volume réduit de préférence circulaire d'offrir les possibilités étendues de variation de rapport de débit entre l'entrée et la sortie de la pompe.The subject of the invention is oil pumps, and more particularly variable displacement oil pumps such as oil pumps comprising a mobile ring surrounding the rotor. Such oil pumps may be used to lubricate the members of a power train, for example a power train of an electric motor vehicle comprising an internal combustion engine. Such oil pumps make it possible, for example, to adapt the oil flow of these members according to the vehicle running conditions, for members such as camshaft phase shifters, valve lever actuators or pushers. variables. In a powertrain, such pumps, typically driven by a crankshaft axis of the engine, must be able to adapt their flow rate not only according to the speed of rotation of the engine, but also according to other driving parameters. Such a variable flow pump is for example described in the patent application FR 2852354 , wherein the ratio of incoming flow to outflow of the pump is changed by means of a movable ring surrounding the rotor, which is displaced relative to the rotor about a pivot axis at the periphery of the rotor. the ring. The displacement of the ring varies the volume available for the admission of the oil into the pump and the volume available for the expulsion of the oil out of the pump. Due to the presence of the mechanisms for moving the ring, the size of such a pump is much larger than the size of the chamber inside which the pallets move. The document also proposes a variant in which the ring is moved in translation, and for which the size of the pump is substantially circular, but the total diameter of the assembly is also substantially greater than the useful volume of the chamber. oil surrounding the rotor. In the variant where the ring pivots about an axis, the pivoting movement is typically applied by means of a pusher pressing a protrusion of the ring, diametrically opposed to the position of the pivot axis. A compression spring serves as an elastic return element to bring the protrusion back to its rest position. The pusher and the spring extend laterally on either side of the outer diameter of the ring, contributing to the overall bulk by a volume which is almost of the same order as that of the ring. In addition, the size associated with the pusher, or with the second outer ring in the translation version, increases further if it is desired to have a large stroke of the movable ring in order to increase the possible variations in the flow rate range. the pump. The object of the invention is to propose a variable flow pump, which makes it possible in a reduced volume, preferably circular, to offer the wide possibilities of variation of the flow ratio between the inlet and the outlet of the pump.

Le document US 3 728 048 est considéré comme l'état de la technique le plus proche et divulgue les caractéristiques de la préambule de la revendication 1. A cette fin, l'invention propose une pompe à huile à débit variable, notamment pour élément de moteur de véhicule automobile, comprenant un carter de pompe et un rotor à palettes radialement mobiles, configuré pour tourner à l'intérieur d'une chambre circulaire imposant la position radiale des palettes. La chambre est définie à l'intérieur d'un anneau mobile configuré pour pouvoir pivoter par rapport au carter de pompe autour d'un axe de rotation de l'anneau, de manière à modifier l'excentration de la chambre par rapport à l'axe du rotor. De manière avantageuse, l'axe de rotation de l'anneau traverse la chambre circulaire.The document US 3,728,048 is considered to be the closest state of the art and discloses the features of the preamble of claim 1. For this purpose, the invention proposes a variable flow oil pump, in particular for a motor vehicle engine element, comprising a pump housing and a rotor with radially movable vanes, configured to rotate inside a circular chamber imposing the radial position of the vanes. The chamber is defined within a movable ring configured to be pivotable relative to the pump housing about an axis of rotation of the ring, so as to modify the eccentricity of the chamber relative to the rotor axis. Advantageously, the axis of rotation of the ring passes through the circular chamber.

Le carter peut comporter un premier contour circulaire de guidage, l'anneau comporter une portion de premier contour extérieur complémentaire du premier contour circulaire de guidage et centrée sur l'axe de rotation de l'anneau. La portion de premier contour extérieur peut entourer la chambre circulaire et la chambre circulaire peut être excentrée par rapport au premier contour extérieur (autrement dit, la chambre peut être excentrée par rapport au centre de rotation de l'anneau).The housing may comprise a first circular guiding contour, the ring having a portion of first outer contour complementary to the first circular guide contour and centered on the axis of rotation of the ring. The first outer contour portion may surround the circular chamber and the circular chamber may be eccentric with respect to the first outer contour (that is, the chamber may be eccentric to the center of rotation of the ring).

Le carter de pompe peut comporter un second contour circulaire de guidage de même axe que le premier contour circulaire de guidage, et s'étendant radialement et/ou axialement au-delà du premier contour circulaire de guidage. L'anneau peut comporter au moins une portion de second contour extérieur configurée pour se déplacer le long du second contour circulaire de guidage.The pump housing may comprise a second circular guide contour of the same axis as the first circular guide contour, and extending radially and / or axially beyond the first circular guide contour. The ring may comprise at minus a second outer contour portion configured to move along the second circular guide contour.

De manière avantageuse, l'étendue angulaire de la ou des portions de second contour extérieur de l'anneau peut être strictement inférieure à l'étendue angulaire du second contour extérieur du carter. La ou des portions de second contour extérieur de l'anneau peuvent ainsi se déplacer circonférentiellement le long du second contour extérieur du carter en gardant une largeur angulaire d'appui constante pendant la rotation de l'anneau et/ou de manière à venir en butée avec le carter pour deux positions extrême limitant la rotation de l'anneau.Advantageously, the angular extent of the portion or portions of the second outer contour of the ring may be strictly less than the angular extent of the second outer contour of the housing. The portion or portions of the second outer contour of the ring can thus move circumferentially along the second outer contour of the housing while keeping a constant angular bearing width during rotation of the ring and / or in order to abut with the housing for two extreme positions limiting the rotation of the ring.

Le second contour circulaire de guidage peut être de diamètre supérieur au premier contour circulaire de guidage, et l'anneau peut comprendre au moins une nervure radiale s'étendant radialement entre la ou les portion(s) de premier contour extérieur et la ou les portion(s) de second contour extérieur.The second circular guide contour may be of greater diameter than the first circular guide contour, and the ring may comprise at least one radial rib extending radially between the portion (s) of the first outer contour and the portion or portions (s) second outer contour.

Selon un autre mode de réalisation qui peut parfois se combiner au précédent, le second contour circulaire de guidage présente au moins une portion s'étendant axialement hors de l'étendue axiale du premier contour circulaire de guidage, et l'anneau comprend au moins une nervure radiale s'étendant axialement dans un volume défini par le second contour circulaire de guidage.According to another embodiment which can sometimes be combined with the preceding, the second circular guide contour has at least one portion extending axially out of the axial extent of the first circular guide contour, and the ring comprises at least one radial rib extending axially in a volume defined by the second circular guide contour.

Avantageusement, la pompe peut comprendre au moins une chambre de régulation pouvant recevoir une pression d'huile de manière à faire tourner l'anneau, et délimitée au moins pour partie par le second contour circulaire de guidage du carter, et une nervure radiale de l'anneauAdvantageously, the pump may comprise at least one control chamber that can receive an oil pressure so as to rotate the ring, and delimited at least partly by the second circular contour for guiding the housing, and a radial rib of the 'ring

La pompe peut comprendre au moins deux chambres de régulation de part et d'autre d'une même nervure radiale.The pump may comprise at least two control chambers on either side of the same radial rib.

La pompe peut comprendre au moins un moyen de rappel élastique de l'anneau en rotation, s'appuyant sur une nervure radiale de l'anneau.The pump may comprise at least one elastic return means of the ring in rotation, resting on a radial rib of the ring.

Selon un mode de réalisation préférentiel, au moins une nervure radiale peut s'étendre jusqu'au second contour circulaire de guidage. Une telle nervure peut ainsi délimiter au moins une chambre de régulation. Selon un mode de réalisation qui peut se combiner au précédent, au moins une nervure peut être d'étendue radiale inférieure au second contour circulaire de guidage, par exemple si cette nervure sert à contenir un moyen de rappel élastiqueAccording to a preferred embodiment, at least one radial rib may extend to the second circular guide contour. Such a rib may thus delimit at least one control chamber. According to an embodiment that can be to combine with the preceding, at least one rib may be of smaller radial extent than the second circular guide contour, for example if this rib serves to contain an elastic return means

L'invention propose également un groupe motopropulseur comprenant un moteur à combustion interne, et comprenant une pompe à huile selon telle que décrite précédemment, le rotor de la pompe à huile étant entraîné par un axe de vilebrequin du moteur, l'axe de vilebrequin entraînant en outre une poulie de diamètre supérieur à l'anneau et recouvrant axialement au moins en partie une portion du carter de pompe.The invention also proposes a power unit comprising an internal combustion engine, and comprising an oil pump according to the above-described method, the rotor of the oil pump being driven by a crankshaft axis of the engine, the crankshaft axis driving in addition, a pulley with a diameter greater than the ring and axially covering at least partly a portion of the pump housing.

Par éléments circulaires, on entend dans le présent texte, des éléments qui sont de révolution autour d'un axe. Suivant un mode de réalisation préférentiel, les éléments circulaires décrits (anneau mobile, chambre circulaire, portion centrale de rotor portant des palettes) sont définis par des portions de cylindre de révolution d'axe parallèle à l'axe de rotation du rotor. On peut envisager des variantes de réalisation non cylindriques, les parois intérieures et extérieures de l'anneau, le logement de l'anneau, les extrémités des palettes, étant par exemple définies par des portions de sphère, portions de sphères qui peuvent être limitées entre un plan supérieur et un plan inférieur parallèles entre eux.By circular elements, we mean in the present text, elements that are of revolution about an axis. According to a preferred embodiment, the circular elements described (movable ring, circular chamber, central rotor portion carrying pallets) are defined by cylinder portions of revolution axis parallel to the axis of rotation of the rotor. It is possible to envisage non-cylindrical variants of embodiment, the inner and outer walls of the ring, the housing of the ring, the ends of the pallets, being for example defined by portions of sphere, portions of spheres that can be limited between an upper plane and a lower plane parallel to each other.

Quelques buts, caractéristiques et avantages de l'invention apparaîtront à la lecture de la description suivante, donnée uniquement à titre d'exemple non limitatif et faite en références aux dessins annexés sur lesquels :

  • La figure 1 est une vue schématique en coupe d'une pompe à huile selon l'invention ;
  • La figure 2 est une vue schématique en coupe de la pompe à huile de la figure 1, dans une configuration de débit différente.
Some objects, features and advantages of the invention will become apparent on reading the following description, given solely by way of nonlimiting example and with reference to the appended drawings in which:
  • The figure 1 is a schematic sectional view of an oil pump according to the invention;
  • The figure 2 is a schematic sectional view of the oil pump of the figure 1 , in a different flow configuration.

Tel qu'illustré sur les figures 1 et 2, une pompe selon l'invention comprend un carter de pompe 15 qui peut également abriter également d'autres organes du moteur, et dans lequel est aménagé un canal d'amenée d'huile 17 arrivant à un évidement circulaire 23, et un canal de départ d'huile 18 repartant de cet évidement circulaire 23, pour amener l'huile vers un organe mécanique à lubrifier. A l'intérieur de l'évidement circulaire 23 est logé un anneau mobile 4, de premier contour extérieur 11 complémentaire du logement circulaire 23, et à l'intérieur duquel est ménagée une chambre circulaire 2 qui est excentrée par rapport au premier contour extérieur 11 de l'anneau 4. Dans la chambre circulaire 2 est installé un rotor 1 à palettes, tournant autour d'un axe géométrique x. Le rotor 1 est équipé de palettes mobiles 5 qui se déplacent radialement par rapport au rotor, par exemple dans des rainures radiales 16, de manière à rester en contact à leur extrémité radiale extérieure avec les parois de la chambre circulaire 2, ou du moins de manière à se déplacer à proximité de cette paroi. Les palettes 5 font ainsi circuler autour du rotor, à l'intérieur de la chambre circulaire 2, suivant le sens de rotation indiqué par la flèche 24, l'huile contenue dans la pompe. Les palettes 5 du rotor 1 peuvent être maintenues appliquées contre la paroi de la chambre circulaire 2 par divers moyens. Dans l'exemple d'un mode de réalisation illustré en figure 1, un anneau 6 d'alignement des palettes du rotor, impose une distance radialement constante entre un point radialement intérieur des palettes, et l'axe x du rotor. L'anneau 6 n'est toutefois pas systématique, son utilisation peut s'avérer nécessaire avec une huile fortement visqueuse. D'autres variantes de réalisation sont envisageables, par exemple chaque pale du rotor pouvant être munie d'un ressort de rappel (non représenté), interposé entre le fond de rainures 16 de guidage et l'extrémité des palettes 5 afin de rappeler les palettes 5 radialement vers l'extérieur.As illustrated on figures 1 and 2 a pump according to the invention comprises a pump housing 15 which can also house other engine components, and in which is arranged an oil supply channel 17 arriving at a circular recess 23, and a oil leaving 18 starting from this circular recess 23, to bring the oil to a mechanical member to lubricate. Inside the circular recess 23 is accommodated a movable ring 4, of first outer contour 11 complementary to the circular housing 23, and inside which is formed a circular chamber 2 which is eccentric with respect to the first outer contour 11 of the ring 4. In the circular chamber 2 is installed a rotor 1 with vanes, rotating around a geometric axis x. The rotor 1 is equipped with moving vanes 5 which move radially relative to the rotor, for example in radial grooves 16, so as to remain in contact at their outer radial end with the walls of the circular chamber 2, or at least way to move near this wall. The vanes 5 thus circulate around the rotor, inside the circular chamber 2, in the direction of rotation indicated by the arrow 24, the oil contained in the pump. The vanes 5 of the rotor 1 can be held against the wall of the circular chamber 2 by various means. In the example of an embodiment illustrated in figure 1 a ring 6 for aligning the vanes of the rotor imposes a radially constant distance between a radially inner point of the vanes and the x axis of the rotor. The ring 6 is however not systematic, its use may be necessary with a highly viscous oil. Other alternative embodiments are conceivable, for example each rotor blade being able to be provided with a return spring (not shown), interposed between the bottom of the guide grooves 16 and the end of the vanes 5 in order to recall the pallets. 5 radially outward.

L'anneau mobile 4 peut lui tourner à l'intérieur de l'évidement circulaire 23 autour d'un axe géométrique de rotation Ω de l'anneau. L'axe Ω de l'anneau mobile 4 se trouve à une distance d non nulle de l'axe x de rotation du rotor 1 de la pompe. A l'intérieur de l'anneau mobile 4 est ménagée la chambre circulaire 2 de centre ω. Le centre ω de la chambre circulaire 2 se trouve à une distance e non nulle de l'axe Ω de l'anneau mobile 4. Lorsque l'anneau mobile 4 tourne autour de son axe Ω, le centre ω de la chambre circulaire 2 se déplace par rapport à l'axe x du rotor, et l'excentration de la chambre circulaire 2 varie par rapport à l'axe x du rotor. L'espace radialement disponible entre le rotor 1 et la périphérie de la chambre circulaire 2 définit une chambre 3 à géométrie variable entourant le rotor, et dont la section radiale varie tout autour du rotor en fonction de l'excentration de la chambre circulaire 2 à cet instant. C'est dans cette chambre 3 à géométrie variable que les palettes 5 du rotor font circuler l'huile autour du rotor 1.The movable ring 4 can rotate inside the circular recess 23 about a geometric axis of rotation Ω of the ring. The axis Ω of the movable ring 4 is at a non-zero distance d from the axis x of rotation of the rotor 1 of the pump. Inside the movable ring 4 is formed the circular chamber 2 of center ω. The center ω of the circular chamber 2 is at a distance e not zero from the axis Ω of the movable ring 4. When the mobile ring 4 rotates about its axis Ω, the center ω of the circular chamber 2 is moves relative to the x-axis of the rotor, and the eccentricity of the circular chamber 2 varies with respect to the x-axis of the rotor. The space radially available between the rotor 1 and the periphery of the circular chamber 2 defines a chamber 3 to variable geometry surrounding the rotor, and whose radial section varies around the rotor according to the eccentricity of the circular chamber 2 at this time. It is in this chamber 3 with variable geometry that the vanes 5 of the rotor circulate the oil around the rotor 1.

On parle ici par abus de langage indifféremment d'axe ou de centre (de rotation) du rotor, de l'anneau mobile ou de la chambre circulaire, car dans l'exemple illustré ces trois éléments sont des formes sensiblement cylindriques -au sens large, donc définis par des contours non nécessairement de révolution - , leurs axes sont parallèles et se déduisent de la position d'un « centre » correspondant de la section du cylindre en question représentée sur la figure.We speak here by language misuse indifferently axis or center (rotation) of the rotor, the movable ring or the circular chamber, because in the example shown these three elements are substantially cylindrical shapes - in the broad sense , therefore defined by contours not necessarily of revolution -, their axes are parallel and are deduced from the position of a "center" corresponding to the section of the cylinder in question shown in the figure.

L'anneau mobile 4, la chambre circulaire 2, et le rotor 1 peuvent être tous trois limités, axialement, sensiblement par un même plan inférieur se trouvant en-dessous du plan de coupe de la figure, et par un même plan supérieur se trouvant au-dessus du plan de coupe de la figure, correspondant respectivement aux limites axiales inférieures et supérieures de la chambre circulaire 2. Le canal 17 d'amenée d'huile se prolonge radialement jusqu'à la chambre circulaire 2, soit en dessous du plan inférieur commun, soit au-dessus du plan supérieur commun, soit, pour certaines variantes de réalisation, pour partie en dessous du plan inférieur commun, et pour partie au dessus du plan supérieur commun. La zone de rencontre entre le canal 17 d'amenée d'huile, et la chambre à géométrie variable 3, définit une zone 19 de régulation du débit d'huile entrant dans la pompe. Le volume de cette zone de régulation 19, et donc la section disponible pour le passage de l'huile augmente quand la distance radiale entre le rotor et la chambre circulaire 2 augmente du côté de l'admission d'huile. Le volume de cette zone de régulation diminue quand cette distance radiale diminue du fait de la rotation de l'anneau mobile 4. De manière similaire, le canal de départ d'huile 18 se prolonge radialement en direction du rotor 1 jusqu'à la chambre circulaire 2, par exemple en-dessous du plan inférieur commun, ou au-dessus du plan supérieur commun. La section de débit d'huile qui peut sortir de la chambre 3, définie par la rencontre entre la chambre à géométrie variable 3 et le canal 18 de départ d'huile, définit une zone de régulation 20 du débit d'huile sortant de la pompe. Le débit d'huile sortant peut être d'autant plus important que la distance radiale dans cette zone 20, entre la chambre circulaire 2 et le rotor 1 est important. Le rapport entre le débit entrant d'huile et le débit sortant d'huile varie en fonction des rapports de section de passage d'huile, autorisés à un instant donné par la zone 19 de régulation de débit d'huile entrant et par la zone 20 de régulation de débit d'huile sortant de la pompe, donc en fonction de la position d'excentration de la chambre 2 par rapport au rotor 1, autrement dit en fonction de la position du centre ω de la chambre 2 par rapport au centre x du rotor et par rapport aux canaux 17 et 18 d'arrivée et de départ d'huile.The mobile ring 4, the circular chamber 2, and the rotor 1 may all be limited, axially, substantially by the same lower plane lying below the section plane of the figure, and by the same top plane lying above the section plane of the figure, respectively corresponding to the lower and upper axial limits of the circular chamber 2. The oil supply channel 17 extends radially to the circular chamber 2, or below the plane lower common, either above the common upper plane or, for some embodiments, partly below the common lower plane, and partly above the common upper plane. The encounter zone between the oil supply channel 17 and the variable geometry chamber 3 defines a zone 19 for regulating the flow of oil entering the pump. The volume of this control zone 19, and therefore the available section for the passage of oil increases when the radial distance between the rotor and the circular chamber 2 increases on the side of the oil intake. The volume of this control zone decreases when this radial distance decreases due to the rotation of the mobile ring 4. Similarly, the oil outlet channel 18 extends radially towards the rotor 1 to the chamber circular 2, for example below the common lower plane, or above the common upper plane. The section of oil flow that can leave room 3, defined by the meeting between the room to variable geometry 3 and the oil departure channel 18, defines a control zone 20 of the oil flow leaving the pump. The outgoing oil flow can be all the more important as the radial distance in this zone 20, between the circular chamber 2 and the rotor 1 is important. The ratio of the oil flow rate to the oil outflow rate varies according to the oil flow section ratios allowed at a given time by the incoming oil flow rate control zone 19 and the zone. 20 to control the flow of oil out of the pump, so depending on the eccentric position of the chamber 2 relative to the rotor 1, in other words according to the position of the center ω of the chamber 2 relative to the center x of the rotor and with respect to the channels 17 and 18 of arrival and departure of oil.

Selon un mode de réalisation avantageux, la distance e entre le centre Ω de l'anneau et le centre ω de la chambre circulaire 2, peut être égale à la distance d entre le centre Ω de l'anneau 4 et l'axe x du rotor 1. L'anneau mobile 4 peut alors être configuré pour pouvoir être placé dans une position angulaire faisant coïncider le centre ω de la chambre circulaire 2 avec l'axe de rotation x du rotor. L'épaisseur radiale de la chambre 3 à géométrie variable peut être alors la même tout autour du rotor 1. Si la section du canal 17 d'amenée d'huile et du canal 18 de départ d'huile sont sensiblement identiques, le débit d'huile entrant est alors dans cette position de l'anneau, sensiblement égal au débit d'huile sortant de la pompe. Cette configuration à iso-débit n'est pas toujours possible dans les systèmes de pompe où l'anneau mobile tourne autour d'un point extérieur à la chambre de circulation de l'huile, ou dans lesquels l'anneau mobile se déplace en translation.According to an advantageous embodiment, the distance e between the center Ω of the ring and the center ω of the circular chamber 2, may be equal to the distance d between the center Ω of the ring 4 and the axis x of the rotor 1. The mobile ring 4 can then be configured to be placed in an angular position coinciding the center ω of the circular chamber 2 with the axis of rotation x of the rotor. The radial thickness of the variable geometry chamber 3 can then be the same all around the rotor 1. If the section of the oil supply channel 17 and the oil outlet channel 18 are substantially identical, the flow rate of The incoming oil is then in this position of the ring, substantially equal to the oil flow exiting the pump. This iso-flow configuration is not always possible in pump systems where the mobile ring rotates around a point outside the oil circulation chamber, or in which the mobile ring moves in translation. .

Comme déjà mentionné précédemment, la rotation de l'anneau se fait par guidage du premier contour extérieur 11 de l'anneau par rapport à un premier contour circulaire de guidage 21 défini par la paroi intérieure de l'évidement 23 dans lequel est logé l'anneau. Afin d'imposer la position angulaire de l'anneau mobile 4, deux chambre de régulation en pression d'huile, respectivement 13 et 14, sont définies de part et d'autre d'une première nervure radiale 7 s'étendant radialement au-delà du premier contour 11 extérieur de l'anneau 4. Un rappel angulaire élastique de l'anneau 4 est assuré par un ressort 9 interposé entre le carter 15, et une seconde nervure radiale 8 de l'anneau mobile 4, s'étendant elle aussi radialement au-delà du premier contour extérieur 11 de l'anneau 4. Les extrémités radiales de la nervure 7 et de la nervure 8, qui forment des zones de contact avec le carter 15, représentent des portions de second contour extérieur de l'anneau 4. Ces portions de second contour extérieur se déplacent suivant un mouvement de rotation en contact avec le carter 15, cette fois-ci non plus en contact avec le premier contour circulaire 21 de guidage limitant l'évidement circulaire 23, mais avec un second contour circulaire de guidage 22, s'étendant radialement à l'extérieur du premier contour circulaire de guidage 21. Par contours circulaires de guidage, on entend ici des contours s'étendant suivant des portions d'arc de cercle autour de l'axe Ω de rotation de l'anneau mobile 4, ces contours pouvant s'étendre tout autour de l'axe Ω, ou pouvant s'étendre sur une ou plusieurs portions angulaires autour de l'axe Ω. Dans un plan de coupe perpendiculaire à l'axe x, le rayon du premier contour circulaire de guidage 21 est de préférence constant, et le rayon du second contour circulaire de guidage peut être également constant.As already mentioned, the rotation of the ring is done by guiding the first outer contour 11 of the ring relative to a first circular guide contour 21 defined by the inner wall of the recess 23 in which is housed the ring. In order to impose the angular position of the mobile ring 4, two oil pressure control chambers, respectively 13 and 14, are defined on either side of a first radial rib 7 extending radially to beyond the first outer contour 11 of the ring 4. An elastic angular reminder of the ring 4 is ensured by a spring 9 interposed between the housing 15, and a second radial rib 8 of the movable ring 4, also extending radially beyond the first outer contour 11 of the ring 4. The radial ends of the rib 7 and rib 8, which form zones of contact with the casing 15, represent portions of the second outer contour of the ring 4. These portions of the second outer contour move in a rotational movement in contact with the casing 15, this time no longer in contact with the first circular guide contour 21 limiting the circular recess 23, but with a second circular guide contour 22, extending radially outside the first circular guide contour 21. circular guiding contours here means contours extending along circular arc portions around the axis Ω of rotation of the movable ring 4, these contours being able to extend all around the axis Ω, or that can stretch re on one or more angular portions around the axis Ω. In a sectional plane perpendicular to the x-axis, the radius of the first circular guide contour 21 is preferably constant, and the radius of the second circular guide contour may also be constant.

La pression d'huile dans les chambres de régulation 13 et 14 est assurée par des canaux d'amenée d'huile (non représentés) dans chacune de ces chambres, dont le débit peut être régulé soit de manière électronique, soit de manière hydraulique suivant des procédés connus. La différence de pression entre les chambres de régulation 13 et 14 se traduit par un moment de rotation appliqué sur l'anneau mobile 4, imposant, en fonction de la différence de pression impliquée, un mouvement de rotation de l'anneau 4 autour de l'axe Ω et une déformation du ressort de rappel 9 qui est proportionnelle à la différence de pression.The oil pressure in the regulation chambers 13 and 14 is provided by oil supply channels (not shown) in each of these chambers, the flow rate of which can be regulated either electronically or hydraulically according to known methods. The pressure difference between the regulation chambers 13 and 14 results in a moment of rotation applied to the mobile ring 4, imposing, as a function of the pressure difference involved, a rotational movement of the ring 4 around the Ω axis and a deformation of the return spring 9 which is proportional to the pressure difference.

On peut envisager des variantes de réalisation dans lesquelles la position angulaire de l'anneau mobile 4 est imposée par des chambres de régulation de pression qui sont situées dans une portion du carter qui se trouve hors de l'étendue axiale de l'anneau mobile 4. Par exemple les chambres de régulations peuvent être situées au-dessus du plan supérieur commun ou en-dessous du plan inférieur commun. L'étendue radiale du second contour de guidage 22 peut être alors inférieure ou égale à l'étendue radiale du premier contour de guidage 21, l'anneau mobile étant entraîné en rotation par des nervures qui sont rattachées à une face radiale de l'anneau au lieu d'être rattachées à la circonférence de l'anneau.Embodiments may be envisaged in which the angular position of the mobile ring 4 is imposed by pressure regulation chambers which are located in a portion of the casing which is outside the axial extent of the mobile ring 4 For example, the control chambers may be located above the common upper plane or below the common lower plane. The radial extent of the second guide contour 22 may then be less than or equal to the radial extent of the first contour 21, the movable ring being rotated by ribs which are attached to a radial face of the ring instead of being attached to the circumference of the ring.

L'invention ne se limite pas aux exemples de réalisation décrits et peut se décliner en de nombreuses variantes. L'axe du rotor peut être entraîné par un autre axe qu'un axe de vilebrequin de moteur. La pompe peut ne pas présenter de position faisant coïncider le centre du rotor et le centre de la chambre circulaire 2. On peut envisager des variantes de réalisation où, pour certaines positions d'excentration de la chambre circulaire 2, au moins l'une des zones de régulation 19 ou 20 d'entrée ou de sortie d'huile n'autoriserait plus du tout le passage de l'huile.The invention is not limited to the embodiments described and can be declined in many variants. The axis of the rotor can be driven by another axis than a motor crankshaft axis. The pump may not have a position making coincide the center of the rotor and the center of the circular chamber 2. It is possible to envisage embodiments where, for certain eccentric positions of the circular chamber 2, at least one of the control zones 19 or 20 of entry or exit of oil would not allow any more passage of the oil.

La pompe à huile selon l'invention présente un encombrement radial réduit, cet encombrement étant en outre concentré dans un volume sensiblement circulaire. L'encombrement radial réduit de ce type de pompe permet d'insérer, lors de l'agencement de différents éléments d'un groupe motopropulseur entre eux, au moins une partie du volume de la pompe à l'intérieur d'un autre élément de révolution présentant un volume creux, tel que l'arrière d'une poulie d'accessoire, ou l'arrière de toute poulie entraînée par l'axe de la pompe, qui peut être typiquement un axe de vilebrequin (10) de moteur à combustion interne. La rotation de l'anneau mobile 4 autour d'un axe Ω qui est proche de l'axe x du rotor présente de nombreux avantages. L'étendue angulaire de déplacement de la chambre circulaire 2 autour de l'axe x du rotor peut être très large. Les géométries sensiblement circulaires d'évidement du rotor sont simples à réaliser. Les interfaces de frottement entre l'anneau mobile 4 et le carter 5 sont réparties tout autour de l'anneau mobile limitant ainsi les dérives des caractéristiques de la pompe avec l'usure des zones de contact.The oil pump according to the invention has a reduced radial size, this space being further concentrated in a substantially circular volume. The reduced radial size of this type of pump makes it possible, during the arrangement of different elements of a powertrain between them, to insert at least a part of the volume of the pump into another element of the pump. revolution having a hollow volume, such as the back of an accessory pulley, or the rear of any pulley driven by the pump shaft, which may typically be a crank shaft (10) of a combustion engine internal. The rotation of the movable ring 4 about an axis Ω which is close to the x-axis of the rotor has many advantages. The angular extent of displacement of the circular chamber 2 around the x axis of the rotor can be very wide. The substantially circular rotor recess geometries are simple to make. The friction interfaces between the movable ring 4 and the casing 5 are distributed all around the mobile ring thus limiting the drifts of the characteristics of the pump with the wear of the contact zones.

Claims (8)

  1. Variable flow oil pump, in particular for a motor vehicle engine element, comprising a pump casing (15), a movable ring (4), and a rotor (1) with radially movable blades (5) which is configured to rotate within a circular chamber (2) imposing the radial position of the blades (5), the chamber (2) being defined within the movable ring (4) itself configured to be able to pivot with respect to the pump casing (15) about an axis (Ω) of rotation of the ring so as to modify the eccentricity of the chamber (2) with respect to the axis (X) of the rotor, the axis (Ω) of rotation of the ring passing through the circular chamber (2), the casing (15) comprising a first circular guide contour (21), the ring (4) comprising a portion of first outer contour (11) complementary with the first circular guide contour (21) of the casing and centred on the axis (Ω) of rotation of the ring, the portion of first outer contour (11) surrounding the circular chamber (2) and being eccentric with respect thereto, characterized in that the casing additionally comprises a second circular guide contour (22) being of same axis (Ω) as the first circular guide contour (21), the second circular contour (22) extending radially and/or axially beyond the first circular guide contour, the ring (4) additionally comprising at least one portion of second outer contour (12) configured to move along the second circular guide contour (22) of the casing.
  2. Oil pump according to Claim 1, in which the angular extent of the portion or portions of second outer contour of the ring (22) is strictly less than the angular extent of the second outer guide contour (22) of the casing.
  3. Oil pump according to Claim 2, in which the second circular guide contour (22) has a diameter greater than that of the first circular guide contour (21), and the ring (4) comprises at least one radial rib (7, 8) extending radially between the portion(s) of first outer contour (11) and the portion(s) of second outer contour (12).
  4. Oil pump according to either of Claims 2 and 3, in which the second circular guide contour has at least one portion extending axially outside the axial extent of the first circular guide contour, and the ring comprises at least one radial rib extending axially in a volume defined by the second circular guide contour.
  5. Oil pump according to Claims 2 to 4, comprising at least one regulation chamber (13, 14) which can receive an oil pressure so as to rotate the ring (4), and delimited least in part by the second circular guide contour (22) of the casing, and a radial rib (7) of the ring (4).
  6. Oil pump according to Claim 5, comprising at least two regulation chambers (13, 14) on either side of one and the same radial rib (7).
  7. Oil pump according to any one of Claims 3 to 6, comprising at least one elastic return means (9) for returning the ring in rotation, which means bears on a radial rib (8) of the ring (4).
  8. Power train unit comprising an internal combustion engine and comprising an oil pump according to any one of the preceding claims, the rotor (1) of the oil pump being driven by a crankshaft (10) of the engine, the crankshaft (10) additionally driving a pulley having a diameter greater than that of the ring (4) and axially covering at least in part a portion of the pump casing (15).
EP15200252.3A 2014-12-22 2015-12-15 Variable rate oil pump Active EP3037664B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1463040A FR3030647B1 (en) 2014-12-22 2014-12-22 OIL PUMP WITH VARIABLE FLOW.

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Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
GB205815A (en) * 1922-10-20 1924-09-18 Rudolf Loehnert Improvements in or relating to hydraulic change speed gears
US3200756A (en) * 1962-10-15 1965-08-17 Jr George D Ratliff Variable displacement motors and speed controls therefor
US3728048A (en) * 1971-05-19 1973-04-17 G Ratliff Variable displacement motors
US6503068B2 (en) * 2000-11-29 2003-01-07 Showa Corporation Variable capacity type pump
FR2852354B1 (en) 2003-03-13 2006-08-04 Giat Ind Sa DEVICE FOR EXHAUST GAS DILUTION
US8047822B2 (en) * 2006-05-05 2011-11-01 Magna Powertrain Inc. Continuously variable displacement vane pump and system

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ES2672359T3 (en) 2018-06-14
FR3030647A1 (en) 2016-06-24
FR3030647B1 (en) 2019-04-05

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