WO2021180489A1 - Plastic flange with reinforcing rim for a rotating electrical machine - Google Patents

Plastic flange with reinforcing rim for a rotating electrical machine Download PDF

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Publication number
WO2021180489A1
WO2021180489A1 PCT/EP2021/054803 EP2021054803W WO2021180489A1 WO 2021180489 A1 WO2021180489 A1 WO 2021180489A1 EP 2021054803 W EP2021054803 W EP 2021054803W WO 2021180489 A1 WO2021180489 A1 WO 2021180489A1
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WO
WIPO (PCT)
Prior art keywords
walls
flange
axis
flange according
wall
Prior art date
Application number
PCT/EP2021/054803
Other languages
French (fr)
Inventor
Fabien Teulon
Anand-Francis CHARLES
Raouaa BAHRI
Venkatesan KUPPUSAMY
Saravanan Govindaraj
Ilayaraja MOORTHY
Original Assignee
Valeo Equipements Electriques Moteur
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 Valeo Equipements Electriques Moteur filed Critical Valeo Equipements Electriques Moteur
Priority to CN202180019820.3A priority Critical patent/CN115244828A/en
Publication of WO2021180489A1 publication Critical patent/WO2021180489A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/08—Insulating casings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the invention relates in particular to a rotating electrical machine comprising a housing comprising at least one flange of plastic material provided with reinforcing walls.
  • a reversible machine is a rotating electrical machine capable of working in a reversible manner, on the one hand, as an electric generator in alternator function and, on the other hand, as an electric motor for example to start the heat engine of the motor vehicle. .
  • a rotating electrical machine comprises a rotor movable in rotation about an axis and a fixed stator surrounding the rotor.
  • alternator mode when the rotor is rotating, it induces a magnetic field in the stator which transforms it into electric current to supply the vehicle's electrical consumers and to recharge the battery.
  • motor mode the stator is electrically powered and induces a magnetic field causing the rotor to rotate through bearings.
  • the rotating electrical machine also comprises an electronic assembly comprising several power modules making it possible to rectify the current supplied by the stator. This electronic module is mounted on the casing of the machine and in particular on one of the flanges forming the casing. In addition, the housing helps maintain and protect the assembly formed by the stator and the rotor.
  • the plastic flanges which are less rigid than the metal flanges, and in which the machine is housed and on which the electronics are mounted in particular, are subjected to significant mechanical stresses. In particular, when the machine is subjected to strong vibrations from the vehicle, the flange is then subjected to significant deformations.
  • the present invention provides a plastic flange for an X axis rotary electrical machine comprising a bottom which extends transversely to the X axis and a side wall extending axially from a periphery of the bottom, characterized in that the at least one of the bottom and of the side wall has a surface from which extends at least one reinforcing wall.
  • the plastic flange is obtained by molding
  • the flange comprises a plurality of walls defining closed cavities
  • the cavities are substantially identical to each other;
  • the cavities have a section in a plane transverse to the X axis having at least two axes of symmetry;
  • the cavities have a hexagonal section
  • the thickness of at least one of the walls is between a quarter of the thickness and once the thickness of the bottom or of the side wall from which it extends, and preferably of the order of half the thickness of the bottom or of the side wall from which it extends;
  • the axial height of at least one of the low walls is between half and three times the thickness of the bottom or of the side wall from which it extends, and preferably of the order of the thickness of the bottom or of the side wall from which it extends;
  • the surface is an outer surface, the flange also comprising an inner surface, another plurality of low walls also extending from the inner surface, at least one low wall of the outer surface being axially aligned with at least one low wall of the interior surface;
  • the flange also comprises a central opening for the passage of the shaft and a hub extending from the central opening, and in which the cavities are formed on the bottom of the flange by on the one hand one of the two pluralities among a plurality of peripheral radial walls extending radially with respect to the axis of the machine from the side wall and a plurality of central radial walls s 'extend radially with respect to the axis of the machine from the rim, and on the other hand a circumferential wall extending around the axis of the machine transversely to the plurality of radial walls;
  • the flange comprises a plurality of central radial walls, and a plurality of peripheral radial walls, the ratio between the number of peripheral radial walls and the number of central radial walls being between 1 and 2 and preferably equal to 1.5;
  • two angularly adjacent walls of one of the plurality of walls are angularly separated by an angle substantially between 10 ° and 15 °, measured from the X axis in a plane perpendicular to this axis;
  • At least one of the walls has an axial height which increases away from the circumferential wall
  • a first outer surface of the flange comprises low walls according to a first embodiment and a second inner surface comprises low walls according to a second embodiment.
  • the object of the present invention also relates to a rotating electrical machine comprising a rotor, a stator, a cooling chamber, and such a flange.
  • Figure 1 shows, schematically and partially, a sectional view of a rotary electrical machine according to an exemplary implementation of the invention.
  • Figure 2a is a perspective view of the flange according to the invention.
  • Figure 2b shows, schematically and partially, two adjacent low walls according to the invention.
  • Figure 2c shows, schematically and partially, two walls axially aligned according to the invention.
  • FIG. 3 is a perspective view of the inside of the flange of [Figure 2a]
  • Figure 4 illustrates a cooling chamber according to the invention.
  • the axial, radial, exterior and interior designations refer to the X axis of the machine, that is to say passing through the shaft 13 at its center.
  • the axial direction corresponds to the X axis while the radial orientations correspond to concurrent planes, and in particular perpendicular, to the X axis.
  • a transverse plane is a plane perpendicular to the axis of the machine X.
  • a lateral surface is a surface of revolution s 'extending around the axis of the machine X.
  • the thickness of a wall is defined by the distance separating the two surfaces forming the wall, along an axis perpendicular to the wall.
  • Figure 1 shows a rotary electrical machine 10 compact and polyphase, in particular for a motor vehicle.
  • This rotating electrical machine 10 converts mechanical energy into electrical energy, in alternator mode, and can operate in motor mode to transform electrical energy into mechanical energy.
  • This rotating electric machine 10 is, for example, an alternator, an alternator-starter, a reversible machine or an electric motor.
  • the rotary electrical machine 10 therefore comprises a casing 11. Inside this casing 11, it further comprises a shaft 13 rotatably mounted by relative to the housing around the X axis, a rotor 12 integral in rotation with the shaft 13 and a stator 15 surrounding the rotor 12. The rotational movement of the rotor 12 therefore takes place around the X axis.
  • a splined end of the shaft 13 ensures the mechanical connection of the electrical machine with an external element to transmit the rotational movement to the shaft 13 or to the shaft 13 to transmit its rotational movement.
  • the rotor 12 has a body in the form of a bundle of sheets. Permanent magnets are implanted in cavities of the body.
  • the stator 15 has a body in the form of a bundle of sheets with notches, equipped with notch insulators for mounting a connected electrical winding. The winding is electrically connected to an electronic control module.
  • the rotor is towards the outside or the machine is an axial flow machine.
  • the housing 11 comprises assembled a front flange 16, and a rear flange 17. At least one of the two flanges is made of plastic, and advantageously the two flanges are made of plastic.
  • plastic flange is meant a flange made of plastic or of composite plastic material.
  • the flange illustrated in Figure 2 comprises a bottom 2 which extends transversely to the X axis and provided at its center with the housing for receiving the bearing.
  • the bottom 2 comprises a central opening 20 for the passage of the shaft 13.
  • the flange further comprises a side wall 3 extending axially from a periphery of the bottom.
  • the inner surface of the flange will be defined hereinafter as being the surface of the bottom and / or of the side wall of the flange which is oriented towards the inside of the machine, that is to say towards the stator.
  • the reinforcing walls 4 extend either from the bottom 2 or from the side wall 3 of the flange.
  • the surface from which the walls 4 extend is all or part of one of the inner or outer surfaces of the bottom or of the side wall of the flange.
  • the low walls 4 advantageously extend substantially perpendicular to the surface.
  • the walls 4 may extend in an oblique direction with respect to the direction perpendicular to the surface from which they extend.
  • the bottom of the flange comprises over its entire surface a plurality of said reinforcing walls forming a mesh defining closed cavities.
  • closed cavity is meant a cavity whose section in a section plane perpendicular to the axis of the machine has a closed periphery.
  • the cavities are defined by a portion of the bottom of the flange and the reinforcing walls.
  • the volume of the cavity is open in the axial direction on the side opposite to the bottom of the flange. The flange thus “hollowed out” of cavities is lightened and stiffened at the same time.
  • through cavities can be considered, that is to say defined only by the reinforcing walls and open axially on either side, the bottom of the flange being locally pierced.
  • the cavities are all substantially identical and mesh the surface regularly.
  • the section of a cavity in the section plane perpendicular to the X axis has at least one axis of symmetry, for example in the case where the section of the cavity is an isosceles triangle .
  • the section of the cavity has at least two axes of symmetry.
  • the section of the cavity is for example triangular or ellipsoidal or rhombus or circular.
  • the cavity comprises for example in this case two planes of symmetry, each plane of symmetry containing the X axis.
  • the cavities are advantageously of hexagonal section. In fact, the fact that three branches extend from each intersection of the mesh significantly stiffens the bottom of the flange.
  • the bottom of the flange therefore has a mesh of reinforcing walls defining a so-called honeycomb stiffening structure.
  • the cavities of the edges of the bottom of the flange that is to say arranged at the junction of the bottom 2 with the central opening 20 or at the junction of the bottom 2 and the side wall 3 are however truncated, that is to say that the sections of these cavities are not complete hexagons. Said truncated cavities are closed either by the wall which forms the edge of the bottom 2 of the flange around its entire periphery, or by the wall which forms the edge of the bottom 2 of the flange at the level of the central opening 20.
  • the thickness of at least one of the walls is between a quarter of the thickness and once the thickness of the bottom or of the side wall from which it extends, and preferably of the order of half the thickness of the bottom or of the side wall from which it extends.
  • the distance between the walls is of the order of one to two times the thickness of the bottom or the side wall of the flange from which it extends.
  • Each wall typically has a thickness of 1 and 1 5mm and advantageously of the order of 1 3mm.
  • the thickness of the bottom 2 of the flange from which the walls 4 forming the cavities 40 extend is typically of the order of half the thickness of the walls 4 as shown in Figure 2b. This gives a flange that is easy to remove from the mold.
  • the low walls have an axial height of the order of 4mm.
  • the height of a wall is advantageously between half and three times the thickness of the bottom.
  • the walls are substantially of the same height as the thickness of the bottom over the entire surface.
  • the thickness of the walls 4 can also be variable so that the thickness of the walls 4 forming a cavity is substantially of the order of the thickness of the bottom 2 which forms the cavity, locally.
  • two axially aligned walls 41, 42 extend on either side of the bottom 2.
  • each of the walls is of the order of half the height axial wall which will be necessary for the desired stiffening.
  • the size associated with the presence of the walls 4 is limited since a given axial height of the wall necessary to stiffen the flange is distributed between the inside and the outside of the machine.
  • the cavities 40 are present only on a part of the bottom 2.
  • the cavities are for example advantageously located on a peripheral surface of the bottom.
  • the cavities are located on a central surface of the bottom. Such location of the cavities makes it possible to optimize the distribution of the cavities to lighten and stiffen the flange without weakening it too much.
  • the honeycomb mesh can be arranged at the level of the inner or outer face of the bottom of the flange. As a variant, the honeycomb mesh could be placed on the inside or the outside of the side wall 3 of the flange.
  • pluralities of radial walls 43 extend on the bottom 2 of the flange, radially relative to the X axis. These radial walls form reinforcing arms and are advantageously located on the inner surface of the bottom 2 of the flange.
  • the radial walls of said plurality extend for example from the side wall 3 of the flange. More precisely a lower end portion of the side wall 30 st defined as being the portion of the side wall which extends from the perimeter of the bottom 2, in its portion located axially close to the bottom 2.
  • the walls 4 are angularly distributed around the X axis of the machine. An angle between 10 ° and 15 ° angularly separates two adjacent walls. Such an angle of separation between the walls makes it possible to optimize the stiffening without making the flange too heavy.
  • the angle between two adjacent walls is advantageously substantially the same all around the axis.
  • the low walls are arranged on a bottom surface defining a peripheral ring around the X axis of the machine.
  • the bottom 2 of the flange also includes a circumferential wall 44.
  • the circumferential wall extends axially around the axis of the machine and intersects at least part of the radial walls 43 of the first plurality.
  • the cavities 40 are then defined by a part of the lower end portion of the side wall 30 as well as by two peripheral radial reinforcing walls 43 and by a portion of the circumferential wall 44.
  • the cavities defined by the plurality of walls have substantially all the same dimensions and the same geometry.
  • Eyelets drilled axially in the circumferential wall make it possible to lighten the flange and to ensure that the material thickness is constant, for molding reasons.
  • a sudden change in thickness or a large thickness of material would imply a molding difficulty due to temperature variations in the mold, therefore a risk of shrinkage or lack of material
  • a second plurality of radial walls extend around the X axis of the machine.
  • the walls of the second plurality are angularly distributed around the axis of the machine on a bottom surface defining a central crown around the X axis.
  • the central opening 20 advantageously comprises a plastic hub 21.
  • the plastic hub extends transversely to the bottom 2 of the flange in the axial direction forming a sleeve.
  • the plastic hub has a metal element.
  • the bearing which will support the shaft is force-fitted.
  • the hub comprising a metal element is molded onto the bearing. The metal element allows good reliability of the front bearing and good control of the clamping of the bearing in the hub
  • the said central radial walls 45 of the second plurality extend from the hub 21, towards the side wall 3, on the bottom 2 of the flange.
  • At least part of the central radial walls intersects the circumferential wall 44.
  • the cavities 4 are then defined by a portion of the hub 21 as well as by two central radial reinforcement walls 45 and by a portion of the circumferential wall 44.
  • the cavities defined by the plurality of low walls all have substantially the same dimensions and the same geometry.
  • the ratio between the number of peripheral radial walls 43 and the number of central radial walls 45 is advantageously of the order of 1.5.
  • the flange comprises several circumferential walls 44 arranged concentrically around the X axis. Such walls 44 intersect the radial walls 43, 45 by defining a plurality of cavities 40.
  • the low walls 43, 45 have an axial height which decreases between the wall from which they extend (that is to say the side wall 2 or the hub 21) and the circumferential wall 44.
  • a low wall has for example an axial height which decreases exponentially between the wall from which it extends and the circumferential wall.
  • the circumferential wall typically has a height of the order of a few millimeters, typically 10mm
  • the profile of the central radial wall 45 has, in the radial direction, a portion of constant axial height from the hub 21 then a portion of axial height which decreases exponentially until reaching the axial height of the circumferential wall 44, at the junction of the radial wall 45 with the circumferential wall 44.
  • the flange has on its bottom face 2 on the outer side, a "honeycomb" mesh and on its bottom face on the inner side of the reinforcing arms.
  • the low walls form open cavities.
  • the plastic flange described above is advantageously obtained by molding.
  • the junctions between bottom 2 and hub 21 or bottom 2 and side wall 3 are slightly rounded, do not have projecting angles.
  • the walls 4 are therefore integral with the bottom 2 of the flange.
  • thermoplastic material is used, or a thermosetting plastic material or else a plastic loaded with fiber such as mechanical textile fiber or fillers such as carbon, graphite, glass fiber, aluminum or copper.
  • the material is reinforced plastic with reinforcing elements such as a metal such as aluminum or a metal alloy at the bottom or the skirt of the flange.
  • the plastic is reinforced with carbon or a textile fiber or an animal or vegetable fiber, such as spider silk or ox nerve or kevlar or hemp.
  • the rear flange 17 also comprises a bottom provided at its center with the housing for receiving the rear bearing, and a side wall extending axially towards the side wall of the front flange.
  • the front and rear flanges are secured to each other so as to form all or part of the housing containing the machine.
  • the fixing of the flanges 16, 17 between them or an intermediate piece can be achieved by means of fixing members, such as screws, passing through perforated lugs projecting radially from the side wall of the flange and intended to cooperate with Corresponding threaded holes formed in lugs projecting radially from the side wall of the other flange or of the intermediate part.
  • the plastic is thermally insulating, it is advantageous to provide cooling by liquid such as oil or water.
  • the front plastic flange 16 can advantageously have a double side wall forming a cooling chamber 160.
  • the side wall of the front flange is formed of two annular walls radially concentric around the axis X, a radially inner wall 31 and a radially outer wall 32.
  • the radially inner wall 31 is positioned facing the coil and the radially outer wall 32 is positioned facing the outside.
  • Each wall 31, 32 extends along the X axis in annular form between one end connected to the bottom 2.
  • the two walls of the double wall are therefore connected to each other at the level of the background.
  • the free ends of the inner and outer walls are the ends not connected to each other and not connected to the transverse wall.
  • the rear flange 17 has for example only a bottom without extension in the form of a side wall.
  • the side wall of the front flange 3 covers the stator 15 over its entire height and the rear flange 17 is a cover without a side wall, the front and rear flanges do not have an overlap surface around the X axis.
  • the cooling chamber 160 is then housed in the side wall of the front flange, between the two concentric walls.
  • the bottom of the rear flange 17 bears at the level of a peripheral zone on the free end of the side wall of the front flange, opposite the bottom of the front flange.
  • the cooling fluid circulates between the two concentric walls.
  • the outer concentric wall 32 then advantageously has reinforcing walls 4 forming at least locally a honeycomb structure. Magnetic noise is thus limited.

Abstract

The present invention relates to a plastic flange for an X-axis rotating electrical machine, comprising a bottom (2) which extends transversely to the X-axis and a side wall (3) extending axially from a perimeter of the bottom, characterised in that at least one of the bottom (2) and the side wall (3) has a surface from which at least one reinforcing rim (4) extends.

Description

Description Description
Titre de l'invention : Flasque plastique muni de murets de renfort pour une machine électrique tournanteTitle of the invention: Plastic flange fitted with reinforcing walls for a rotating electrical machine
[0001] L’invention concerne notamment une machine électrique tournante comportant un carter comprenant au moins un flasque en matériau plastique muni de murets de renfort. [0001] The invention relates in particular to a rotating electrical machine comprising a housing comprising at least one flange of plastic material provided with reinforcing walls.
[0002] L’invention trouve une application particulièrement avantageuse dans le domaine des machines électriques tournantes telles que les alternateurs, les alterno-démarreurs ou encore les machines réversibles ou les moteurs électriques. On rappelle qu’une machine réversible est une machine électrique tournante apte à travailler de manière réversible, d’une part, comme générateur électrique en fonction alternateur et, d’autre part, comme moteur électrique par exemple pour démarrer le moteur thermique du véhicule automobile. The invention finds a particularly advantageous application in the field of rotating electrical machines such as alternators, alternator-starters or even reversible machines or electric motors. It is recalled that a reversible machine is a rotating electrical machine capable of working in a reversible manner, on the one hand, as an electric generator in alternator function and, on the other hand, as an electric motor for example to start the heat engine of the motor vehicle. .
[0003] Une machine électrique tournante comprend un rotor mobile en rotation autour d’un axe et un stator fixe entourant le rotor. En mode alternateur, lorsque le rotor est en rotation, il induit un champ magnétique au stator qui le transforme en courant électrique afin d’alimenter les consommateurs électriques du véhicule et de recharger la batterie. En mode moteur, le stator est alimenté électriquement et induit un champ magnétique entraînant le rotor en rotation par l’intermédiaire de roulements. La machine électrique tournante comporte également un ensemble électronique comprenant plusieurs modules de puissance permettant de redresser le courant fourni par le stator. Ce module électronique est monté sur le carter de la machine et notamment sur un des flasques formant le carter. En outre, le carter permet de maintenir et de protéger l’ensemble formé par le stator et le rotor. [0003] A rotating electrical machine comprises a rotor movable in rotation about an axis and a fixed stator surrounding the rotor. In alternator mode, when the rotor is rotating, it induces a magnetic field in the stator which transforms it into electric current to supply the vehicle's electrical consumers and to recharge the battery. In motor mode, the stator is electrically powered and induces a magnetic field causing the rotor to rotate through bearings. The rotating electrical machine also comprises an electronic assembly comprising several power modules making it possible to rectify the current supplied by the stator. This electronic module is mounted on the casing of the machine and in particular on one of the flanges forming the casing. In addition, the housing helps maintain and protect the assembly formed by the stator and the rotor.
[0004] Dans un soucis d’allègement du poids général de la machine, visant à limiter les émissions de C02 pour respecter les normes antipollution, des flasques en matériau plastique ont été développés. [0004] In order to lighten the general weight of the machine, aiming to limit C02 emissions in order to comply with antipollution standards, plastic material flanges have been developed.
[0005] Les flasques plastique, moins rigides que les flasques métalliques, et dans lesquels est logée la machine et sur lesquels sont montés notamment l’électronique sont soumis à des contraintes mécaniques importantes. En particulier, lorsque la machine est soumise aux vibrations fortes du véhicule, le flasque est alors soumis à des déformations importantes. [0005] The plastic flanges, which are less rigid than the metal flanges, and in which the machine is housed and on which the electronics are mounted in particular, are subjected to significant mechanical stresses. In In particular, when the machine is subjected to strong vibrations from the vehicle, the flange is then subjected to significant deformations.
[0006] La présente invention propose un flasque plastique pour machine électrique tournante d’axe X comprenant un fond qui s’étend transversalement à l’axe X et une paroi latérale s’étendant axialement depuis un pourtour du fond, caractérisé en ce que l’un au moins du fond et de la paroi latérale a une surface d’où s’étend au moins un muret de renfort. The present invention provides a plastic flange for an X axis rotary electrical machine comprising a bottom which extends transversely to the X axis and a side wall extending axially from a periphery of the bottom, characterized in that the at least one of the bottom and of the side wall has a surface from which extends at least one reinforcing wall.
[0007] Les murets permettent de rigidifier le flasque qui se déforme alors moins. De plus un tel flasque localement creusé par des cavités est encore plus allégé. The low walls make it possible to stiffen the flange which then deforms less. In addition, such a flange locally hollowed out by cavities is even lighter.
[0008] Selon d’autres caractéristiques prises isolément ou en combinaison : [0008] According to other characteristics taken alone or in combination:
[0009] le flasque plastique est obtenu par moulage ; [0009] the plastic flange is obtained by molding;
[0010] le flasque comprend une pluralité de murets définissant des cavités fermées ; [0010] the flange comprises a plurality of walls defining closed cavities;
[0011] les cavités sont sensiblement identiques les unes aux autres ; The cavities are substantially identical to each other;
[0012] les cavités ont une section dans un plan transverse à l’axe X présentant au moins deux axes de symétrie ; [0012] the cavities have a section in a plane transverse to the X axis having at least two axes of symmetry;
[0013] les cavités ont une section hexagonale ; The cavities have a hexagonal section;
[0014] l’épaisseur d’au moins un des murets est comprise entre le quart de l’épaisseur et une fois l’épaisseur du fond ou de la paroi latérale dont il s’étend, et préférentiellement de l’ordre de la moitié de l’épaisseur du fond ou de la paroi latérale dont il s’étend ; [0014] the thickness of at least one of the walls is between a quarter of the thickness and once the thickness of the bottom or of the side wall from which it extends, and preferably of the order of half the thickness of the bottom or of the side wall from which it extends;
[0015] la hauteur axiale d’au moins un des murets est comprise entre la moitié et trois fois l’épaisseur du fond ou de la paroi latérale dont il s’étend, et préférentiellement de l’ordre de l’épaisseur du fond ou de la paroi latérale dont il s’étend ; [0015] the axial height of at least one of the low walls is between half and three times the thickness of the bottom or of the side wall from which it extends, and preferably of the order of the thickness of the bottom or of the side wall from which it extends;
[0016] la surface est une surface extérieure, le flasque comprenant également une surface intérieure, une autre pluralité de murets s’étendant aussi depuis la surface intérieure, au moins un muret de la surface extérieure étant axialement aligné avec au moins un muret de la surface intérieure; [0016] the surface is an outer surface, the flange also comprising an inner surface, another plurality of low walls also extending from the inner surface, at least one low wall of the outer surface being axially aligned with at least one low wall of the interior surface;
[0017] le flasque comprend également une ouverture centrale de passage de l’arbre et un moyeu s’étendant depuis l’ouverture centrale, et dans lequel les cavités sont formées sur le fond du flasque par d’une part l’une des deux pluralités parmi une pluralité de murets radiaux périphériques s’étendent radialement par rapport à l’axe de la machine depuis la paroi latérale et une pluralité de murets radiaux centraux s’étendent radialement par rapport à l’axe de la machine depuis le rebord, et d’autre part un muret circonférentiel s’étendant autour de l’axe de la machine transversalement à la pluralité de murets radiaux; [0017] the flange also comprises a central opening for the passage of the shaft and a hub extending from the central opening, and in which the cavities are formed on the bottom of the flange by on the one hand one of the two pluralities among a plurality of peripheral radial walls extending radially with respect to the axis of the machine from the side wall and a plurality of central radial walls s 'extend radially with respect to the axis of the machine from the rim, and on the other hand a circumferential wall extending around the axis of the machine transversely to the plurality of radial walls;
[0018] le flasque comprend une pluralité de murets radiaux centraux, et une pluralité de murets radiaux périphériques, le rapport entre le nombre de murets radiaux périphériques et le nombre de murets radiaux centraux étant compris entre 1 et 2 et préférentiellement égal à 1.5 ; The flange comprises a plurality of central radial walls, and a plurality of peripheral radial walls, the ratio between the number of peripheral radial walls and the number of central radial walls being between 1 and 2 and preferably equal to 1.5;
[0019] deux murets angulairement adjacents d’une des pluralités de murets sont angulairement séparés d’un angle sensiblement compris entre 10° et 15°, mesuré depuis l’axe X dans un plan perpendiculaire à cet axe ; [0019] two angularly adjacent walls of one of the plurality of walls are angularly separated by an angle substantially between 10 ° and 15 °, measured from the X axis in a plane perpendicular to this axis;
[0020] au moins l’un des murets a une hauteur axiale qui augmente en s’éloignant du muret circonférentiel ; [0020] at least one of the walls has an axial height which increases away from the circumferential wall;
[0021] une première surface extérieure du flasque comprend des murets selon un premier mode de réalisation et une deuxième surface intérieure comprend des murets selon un deuxième mode de réalisation. A first outer surface of the flange comprises low walls according to a first embodiment and a second inner surface comprises low walls according to a second embodiment.
[0022] L’objet de la présente invention porte également sur une machine électrique tournante comprenant un rotor, un stator, une chambre de refroidissement, et un tel flasque. The object of the present invention also relates to a rotating electrical machine comprising a rotor, a stator, a cooling chamber, and such a flange.
[0023] La présente invention pourra être mieux comprise à la lecture de la description détaillée qui va suivre, d’exemples de mise en oeuvre non limitatifs de l’invention et de l’examen des dessins annexés. [0023] The present invention may be better understood from reading the detailed description which follows, of non-limiting examples of implementation of the invention and of the examination of the accompanying drawings.
[0024] La [Figure 1] représente, schématiquement et partiellement, une vue en coupe d’une machine électrique tournante selon un exemple de mise en oeuvre de l’invention. [0024] [Figure 1] shows, schematically and partially, a sectional view of a rotary electrical machine according to an exemplary implementation of the invention.
[0025] La [Figure 2a] est une vue en perspective du flasque selon l’invention. [0025] [Figure 2a] is a perspective view of the flange according to the invention.
[0026] La [Figure 2b] représente, schématiquement et partiellement, deux murets adjacents selon l’invention. [0027] La [Figure 2c] représente, schématiquement et partiellement, deux murets axialement alignés selon l’invention. [0026] [Figure 2b] shows, schematically and partially, two adjacent low walls according to the invention. [0027] [Figure 2c] shows, schematically and partially, two walls axially aligned according to the invention.
[0028] La [Figure 3] est une vue en perspective de l’intérieur du flasque de la [Figure 2a] [0028] [Figure 3] is a perspective view of the inside of the flange of [Figure 2a]
[0029] La [Figure 4] illustre une chambre de refroidissement selon l’invention. [0029] [Figure 4] illustrates a cooling chamber according to the invention.
[0030] Les éléments identiques, similaires ou analogues conservent les mêmes références d’une figure à l’autre. On notera également que les différentes figures ne sont pas nécessairement à la même échelle. De plus, les exemples de réalisation qui sont décrits dans la suite ne sont nullement limitatifs. On pourra notamment imaginer des variantes de l’invention ne comprenant qu’une sélection de caractéristiques décrites par la suite isolées des autres caractéristiques décrites. En particulier toutes les variantes et tous les modes de réalisation décrits sont combinables entre eux si rien ne s’oppose à cette combinaison sur le plan technique. Identical, similar or analogous elements retain the same references from one figure to another. It will also be noted that the different figures are not necessarily on the same scale. In addition, the exemplary embodiments which are described below are in no way limiting. In particular, variants of the invention can be imagined comprising only a selection of characteristics described below isolated from the other characteristics described. In particular, all of the variants and all of the embodiments described can be combined with one another if there is nothing to prevent this combination from a technical point of view.
[0031] Dans la suite de la description, les dénominations axiales, radiales, extérieures et intérieures se réfèrent à l’axe X de la machine c’est-à-dire traversant en son centre l’arbre 13. La direction axiale correspond à l'axe X alors que les orientations radiales correspondent à des plans concourants, et notamment perpendiculaires, à l'axe X. Un plan transversal est un plan perpendiculaire à l’axe de la machine X. Une surface latérale est une surface de révolution s’étendant autour de l’axe de la machine X. L’épaisseur d’une paroi est définie par la distance séparant les deux surfaces formant la paroi, selon un axe perpendiculaire à la paroi. In the remainder of the description, the axial, radial, exterior and interior designations refer to the X axis of the machine, that is to say passing through the shaft 13 at its center. The axial direction corresponds to the X axis while the radial orientations correspond to concurrent planes, and in particular perpendicular, to the X axis. A transverse plane is a plane perpendicular to the axis of the machine X. A lateral surface is a surface of revolution s 'extending around the axis of the machine X. The thickness of a wall is defined by the distance separating the two surfaces forming the wall, along an axis perpendicular to the wall.
[0032] La figure 1 représente une machine électrique tournante 10 compacte et polyphasée, notamment pour véhicule automobile. Cette machine électrique tournante 10 transforme de l’énergie mécanique en énergie électrique, en mode alternateur, et peut fonctionner en mode moteur pour transformer de l’énergie électrique en énergie mécanique. Cette machine électrique tournante 10 est, par exemple, un alternateur, un alterno-démarreur, une machine réversible ou un moteur électrique. [0032] Figure 1 shows a rotary electrical machine 10 compact and polyphase, in particular for a motor vehicle. This rotating electrical machine 10 converts mechanical energy into electrical energy, in alternator mode, and can operate in motor mode to transform electrical energy into mechanical energy. This rotating electric machine 10 is, for example, an alternator, an alternator-starter, a reversible machine or an electric motor.
[0033] La machine électrique tournante 10 comporte donc un carter 11. A l'intérieur de ce carter 11 , elle comporte, en outre, un arbre 13 monté en rotation par rapport au carter autour de l’axe X, un rotor 12 solidaire en rotation de l’arbre 13 et un stator 15 entourant le rotor 12. Le mouvement de rotation du rotor 12 se fait donc autour de l’axe X. The rotary electrical machine 10 therefore comprises a casing 11. Inside this casing 11, it further comprises a shaft 13 rotatably mounted by relative to the housing around the X axis, a rotor 12 integral in rotation with the shaft 13 and a stator 15 surrounding the rotor 12. The rotational movement of the rotor 12 therefore takes place around the X axis.
[0034] Une extrémité cannelée de l’arbre 13 permet d'assurer la liaison mécanique de la machine électrique avec un élément extérieur pour transmettre le mouvement de rotation à l’arbre 13 ou à l’arbre 13 de transmettre son mouvement de rotation. A splined end of the shaft 13 ensures the mechanical connection of the electrical machine with an external element to transmit the rotational movement to the shaft 13 or to the shaft 13 to transmit its rotational movement.
[0035] Le rotor 12 comporte un corps sous la forme d’un paquet de tôles. Des aimants permanents sont implantés dans des cavités du corps. Le stator 15 comporte un corps en forme d'un paquet de tôles doté d'encoches, équipées d’isolants d’encoches pour le montage d’un bobinage électrique connecté. Le bobinage est relié électriquement à un module électronique de commande. [0035] The rotor 12 has a body in the form of a bundle of sheets. Permanent magnets are implanted in cavities of the body. The stator 15 has a body in the form of a bundle of sheets with notches, equipped with notch insulators for mounting a connected electrical winding. The winding is electrically connected to an electronic control module.
[0036] En variante le rotor est vers l'extérieur ou la machine est une machine à flux axial. As a variant, the rotor is towards the outside or the machine is an axial flow machine.
[0037] Le carter 11 comporte assemblés un flasque avant 16, et un flasque arrière 17. L’un au moins des deux flasques est en matière plastique, et avantageusement les deux flasques sont en matière plastique. The housing 11 comprises assembled a front flange 16, and a rear flange 17. At least one of the two flanges is made of plastic, and advantageously the two flanges are made of plastic.
[0038] Ce qui sera décrit dans la suite concerne l’au moins un des deux flasques en matière plastique, qui pourra être indifféremment le flasque avant ou le flasque arrière. What will be described below concerns at least one of the two plastic flanges, which can be either the front flange or the rear flange.
[0039] On entend par flasque plastique un flasque en plastique ou en matériau plastique composite. By plastic flange is meant a flange made of plastic or of composite plastic material.
[0040] Le flasque illustré à la figure 2 comporte un fond 2 qui s’étend transversalement à l’axe X et muni en son centre du logement de réception du roulement. Le fond 2 comprend une ouverture centrale 20 pour le passage de l'arbre 13. Le flasque comporte, en outre, une paroi latérale 3 s’étendant axialement depuis un pourtour du fond. The flange illustrated in Figure 2 comprises a bottom 2 which extends transversely to the X axis and provided at its center with the housing for receiving the bearing. The bottom 2 comprises a central opening 20 for the passage of the shaft 13. The flange further comprises a side wall 3 extending axially from a periphery of the bottom.
[0041] On définira pour la suite la surface intérieure du flasque comme étant la surface du fond et/ou de la paroi latérale du flasque qui est orientée vers l’intérieur de la machine, c’est à dire vers le stator. On définira la surface extérieure du flasque comme étant la surface du fond et/ou de la paroi latérale du flasque qui est orientée vers l’extérieur de la machine. The inner surface of the flange will be defined hereinafter as being the surface of the bottom and / or of the side wall of the flange which is oriented towards the inside of the machine, that is to say towards the stator. We will define the surface of the flange as being the surface of the bottom and / or of the side wall of the flange which is oriented towards the outside of the machine.
[0042] Les murets de renfort 4 s’étendent soit depuis le fond 2 soit depuis la paroi latérale 3 du flasque. La surface d’où s’étendent les murets 4 est tout ou partie de l’une des surfaces intérieure ou extérieure du fond ou de la paroi latérale du flasque. The reinforcing walls 4 extend either from the bottom 2 or from the side wall 3 of the flange. The surface from which the walls 4 extend is all or part of one of the inner or outer surfaces of the bottom or of the side wall of the flange.
[0043] Les murets 4 s’étendent avantageusement sensiblement perpendiculairement à la surface. En variante les murets 4 peuvent s’étendre dans une direction oblique par rapport à la direction perpendiculaire à la surface d’où ils s’étendent. The low walls 4 advantageously extend substantially perpendicular to the surface. As a variant, the walls 4 may extend in an oblique direction with respect to the direction perpendicular to the surface from which they extend.
[0044] Dans un premier mode de réalisation illustré à la figure 2a, le fond du flasque comprend sur toute sa surface une pluralité desdits murets de renfort formant un maillage définissant des cavités fermées. On entend par cavité fermée une cavité dont la section dans un plan de coupe perpendiculaire à l’axe de la machine a une périphérie fermée. En volume les cavités sont définies par une portion du fond du flasque et les murets de renfort. Le volume de la cavité est ouvert dans la direction axiale du côté opposé au fond du flasque. Le flasque ainsi « creusé » de cavités est allégé et rigidifié à la fois. In a first embodiment illustrated in Figure 2a, the bottom of the flange comprises over its entire surface a plurality of said reinforcing walls forming a mesh defining closed cavities. By closed cavity is meant a cavity whose section in a section plane perpendicular to the axis of the machine has a closed periphery. In volume, the cavities are defined by a portion of the bottom of the flange and the reinforcing walls. The volume of the cavity is open in the axial direction on the side opposite to the bottom of the flange. The flange thus “hollowed out” of cavities is lightened and stiffened at the same time.
[0045] En variante on pourra envisager des cavités traversantes c’est-à-dire définies uniquement par les murets de renfort et ouvertes axialement de part et d’autre, le fond du flasque étant localement percé. [0045] As a variant, through cavities can be considered, that is to say defined only by the reinforcing walls and open axially on either side, the bottom of the flange being locally pierced.
[0046] De façon générale les cavités sont toutes sensiblement identiques et maillent la surface régulièrement. In general, the cavities are all substantially identical and mesh the surface regularly.
[0047] Dans ce premier mode de réalisation, la section d’une cavité dans le plan de coupe perpendiculaire à l’axe X présente au moins un axe de symétrie, par exemple dans le cas où la section de la cavité est un triangle isocèle. Avantageusement la section de la cavité présente au moins deux axes de symétrie. La section de la cavité est par exemple triangulaire ou ellipsoïdale ou losange ou circulaire. En trois dimensions, la cavité comprend par exemple dans ce cas deux plans de symétrie, chaque plan de symétrie contenant l’axe X. [0048] Les cavités sont avantageusement de section hexagonale. En effet le fait que de chaque intersection du maillage s’étende trois branches rigidifie de façon importante le fond du flasque. In this first embodiment, the section of a cavity in the section plane perpendicular to the X axis has at least one axis of symmetry, for example in the case where the section of the cavity is an isosceles triangle . Advantageously, the section of the cavity has at least two axes of symmetry. The section of the cavity is for example triangular or ellipsoidal or rhombus or circular. In three dimensions, the cavity comprises for example in this case two planes of symmetry, each plane of symmetry containing the X axis. The cavities are advantageously of hexagonal section. In fact, the fact that three branches extend from each intersection of the mesh significantly stiffens the bottom of the flange.
[0049] Le fond du flasque présente donc un maillage de murets de renfort définissant une structure rigidifiante dite en nid d’abeille. The bottom of the flange therefore has a mesh of reinforcing walls defining a so-called honeycomb stiffening structure.
[0050] Les cavités des bords du fond du flasque, c’est-à-dire disposées au niveau de la jonction du fond 2 avec l’ouverture centrale 20 ou au niveau de la jonction du fond 2 et de la paroi latérale 3 sont cependant tronquées c’est-à-dire que les sections de ces cavités ne sont pas des hexagones complets. Lesdites cavités tronquées sont fermées soit par le muret qui forme le bord du fond 2 du flasque sur tout son pourtour, soit par le muret qui forme le bord du fond 2 du flasque au niveau de l’ouverture centrale 20. The cavities of the edges of the bottom of the flange, that is to say arranged at the junction of the bottom 2 with the central opening 20 or at the junction of the bottom 2 and the side wall 3 are however truncated, that is to say that the sections of these cavities are not complete hexagons. Said truncated cavities are closed either by the wall which forms the edge of the bottom 2 of the flange around its entire periphery, or by the wall which forms the edge of the bottom 2 of the flange at the level of the central opening 20.
[0051] Dans un mode réalisation avantageux, l’épaisseur d’au moins un des murets est comprise entre le quart de l’épaisseur et une fois l’épaisseur du fond ou de la paroi latérale dont il s’étend, et préférentiellement de l’ordre de la moitié de l’épaisseur du fond ou de la paroi latérale dont il s’étend. La distance entre les murets est de l’ordre de une à deux fois l’épaisseur du fond ou de la paroi latérale du flasque d’où il s’étend. In an advantageous embodiment, the thickness of at least one of the walls is between a quarter of the thickness and once the thickness of the bottom or of the side wall from which it extends, and preferably of the order of half the thickness of the bottom or of the side wall from which it extends. The distance between the walls is of the order of one to two times the thickness of the bottom or the side wall of the flange from which it extends.
[0052] Chaque muret a typiquement une épaisseur 1 et 1 5mm et avantageusement de l’ordre de 1 3mm L’épaisseur du fond 2 du flasque d’où s’étendent les murets 4 formant les cavités 40 est typiquement de l’ordre de la moitié de l’épaisseur des murets 4 comme illustré à la figure 2b. On obtient ainsi un flasque facile à démouler. Each wall typically has a thickness of 1 and 1 5mm and advantageously of the order of 1 3mm. The thickness of the bottom 2 of the flange from which the walls 4 forming the cavities 40 extend is typically of the order of half the thickness of the walls 4 as shown in Figure 2b. This gives a flange that is easy to remove from the mold.
[0053] Les murets ont une hauteur axiale de l’ordre de 4mm. La hauteur d’un muret est avantageusement comprise entre la moitié et trois fois l’épaisseur du fond. Dans le cas où l’épaisseur du fond est sensiblement homogène dans son plan d’extension, les murets sont sensiblement de même hauteur que l’épaisseur du fond sur toute la surface. En variante dans le cas où l’épaisseur du fond 2 est variable, l’épaisseur des murets 4 peut être également variable de sorte que l’épaisseur des murets 4 formant une cavité est sensiblement de l’ordre de l’épaisseur du fond 2 qui forme la cavité, localement. [0054] En variante illustrée à la figure 2c, deux murets axialement alignés 41 , 42 s’étendent de part et d’autre du fond 2. Avantageusement, la hauteur de chacun des murets est de l’ordre de la moitié de la hauteur axiale du muret qui sera nécessaire pour la rigidification souhaitée. Ainsi on limite l’encombrement lié à la présence des murets 4 puisqu’une hauteur axiale de muret donnée nécessaire pour rigidifier le flasque est répartie entre l’intérieur et l’extérieur de la machine. The low walls have an axial height of the order of 4mm. The height of a wall is advantageously between half and three times the thickness of the bottom. In the case where the thickness of the bottom is substantially homogeneous in its extension plane, the walls are substantially of the same height as the thickness of the bottom over the entire surface. As a variant in the case where the thickness of the bottom 2 is variable, the thickness of the walls 4 can also be variable so that the thickness of the walls 4 forming a cavity is substantially of the order of the thickness of the bottom 2 which forms the cavity, locally. In a variant illustrated in Figure 2c, two axially aligned walls 41, 42 extend on either side of the bottom 2. Advantageously, the height of each of the walls is of the order of half the height axial wall which will be necessary for the desired stiffening. Thus, the size associated with the presence of the walls 4 is limited since a given axial height of the wall necessary to stiffen the flange is distributed between the inside and the outside of the machine.
[0055] En variantes les cavités 40 ne sont présentes que sur une partie du fond 2. Les cavités sont par exemple avantageusement localisées sur une surface périphérique du fond. En variante les cavités sont localisées sur une surface centrale du fond. Une telle localisation des cavités permet d’optimiser la répartition des cavités pour alléger et rigidifier le flasque sans pour autant trop le fragiliser. In variants, the cavities 40 are present only on a part of the bottom 2. The cavities are for example advantageously located on a peripheral surface of the bottom. As a variant, the cavities are located on a central surface of the bottom. Such location of the cavities makes it possible to optimize the distribution of the cavities to lighten and stiffen the flange without weakening it too much.
[0056] Le maillage en nid d’abeille pourra être disposé au niveau de la face intérieure ou extérieure du fond du flasque. En variante le maillage en nid d’abeille pourra être disposé sur la face intérieure ou la face extérieure de la paroi latérale 3 du flasque. [0056] The honeycomb mesh can be arranged at the level of the inner or outer face of the bottom of the flange. As a variant, the honeycomb mesh could be placed on the inside or the outside of the side wall 3 of the flange.
[0057] Dans un deuxième mode de réalisation illustré à la figure 3, des pluralités de murets radiaux 43 s’étendent sur le fond 2 du flasque, radialement par rapport à l’axe X. Ces murets radiaux forment des bras de renfort et sont avantageusement situés sur la surface intérieure du fond 2 du flasque. In a second embodiment illustrated in Figure 3, pluralities of radial walls 43 extend on the bottom 2 of the flange, radially relative to the X axis. These radial walls form reinforcing arms and are advantageously located on the inner surface of the bottom 2 of the flange.
[0058] Les murets radiaux de ladite pluralité s’étendent par exemple depuis la paroi latérale 3 du flasque. Plus précisément une portion d’extrémité inférieure de la paroi latérale 30 st définie comme étant la portion de la paroi latérale qui s’étend du pourtour du fond 2, dans sa portion située axialement à proximité du fond 2. Les murets radiaux dits périphériques s’étendent depuis ladite portion d’extrémité inférieure de la paroi latérale 30, sur le fond du flasque, vers l’axe X. Les murets 4 sont angulairement répartis autour de l’axe X de la machine. Un angle compris entre 10° et 15° sépare angulairement deux murets adjacents. Un tel angle de séparation entre les murets permet d’optimiser la rigidification sans trop alourdir le flasque. L’angle entre deux murets adjacents est avantageusement sensiblement le même tout autour de l’axe. Les murets sont disposés sur une surface du fond définissant une couronne périphérique autour de l’axe X de la machine. The radial walls of said plurality extend for example from the side wall 3 of the flange. More precisely a lower end portion of the side wall 30 st defined as being the portion of the side wall which extends from the perimeter of the bottom 2, in its portion located axially close to the bottom 2. The so-called peripheral radial walls s 'extend from said lower end portion of the side wall 30, on the bottom of the flange, towards the X axis. The walls 4 are angularly distributed around the X axis of the machine. An angle between 10 ° and 15 ° angularly separates two adjacent walls. Such an angle of separation between the walls makes it possible to optimize the stiffening without making the flange too heavy. The angle between two adjacent walls is advantageously substantially the same all around the axis. The low walls are arranged on a bottom surface defining a peripheral ring around the X axis of the machine.
[0059] Le fond 2 du flasque comprend également un muret circonférentiel 44. Le muret circonférentiel s’étend axialement autour de l’axe de la machine et coupe au moins une partie des murets radiaux 43 de la première pluralité. Les cavités 40 sont alors définies par une partie de la portion d’extrémité inférieure de la paroi latérale 30 ainsi que par deux murets de renfort radiaux périphériques 43 et par une portion du muret circonférentiel 44. Les cavités définies par la pluralité de murets ont sensiblement toute les mêmes dimensions et la même géométrie. The bottom 2 of the flange also includes a circumferential wall 44. The circumferential wall extends axially around the axis of the machine and intersects at least part of the radial walls 43 of the first plurality. The cavities 40 are then defined by a part of the lower end portion of the side wall 30 as well as by two peripheral radial reinforcing walls 43 and by a portion of the circumferential wall 44. The cavities defined by the plurality of walls have substantially all the same dimensions and the same geometry.
[0060] Des oeillets percés axialement dans le muret circonférentiel permettent d’alléger le flasque et de faire en sorte que l’épaisseur de matière soit constante, pour des raisons de moulage. Une brusque variation d’épaisseur ou une forte épaisseur de matière impliquerait une difficulté de moulage due aux variations de température dans le moule, donc un risque de retassure ou manque matièreEyelets drilled axially in the circumferential wall make it possible to lighten the flange and to ensure that the material thickness is constant, for molding reasons. A sudden change in thickness or a large thickness of material would imply a molding difficulty due to temperature variations in the mold, therefore a risk of shrinkage or lack of material
[0061] En combinaison, une deuxième pluralité de murets radiaux s’étend autour de l’axe X de la machine. Les murets de la deuxième pluralité sont angulairement répartis autour de l’axe de la machine sur une surface du fond définissant une couronne centrale autour de l’axe X. In combination, a second plurality of radial walls extend around the X axis of the machine. The walls of the second plurality are angularly distributed around the axis of the machine on a bottom surface defining a central crown around the X axis.
[0062] L’ouverture centrale 20 comprend avantageusement un moyeu plastique 21. Le moyeu plastique s’étend transversalement au fond 2 du flasque dans la direction axiale formant un manchon. Le moyeu plastique comporte un élément en métal. Dans cet élément en métal on vient emmancher en force le roulement qui va soutenir l’arbre En variante le moyeu comportant un élément en métal est surmoulé sur le roulement. L’élément en métal permet une bonne fiabilité du roulement avant et une bonne maîtrise du serrage du roulement dans le moyeuThe central opening 20 advantageously comprises a plastic hub 21. The plastic hub extends transversely to the bottom 2 of the flange in the axial direction forming a sleeve. The plastic hub has a metal element. In this metal element, the bearing which will support the shaft is force-fitted. As a variant, the hub comprising a metal element is molded onto the bearing. The metal element allows good reliability of the front bearing and good control of the clamping of the bearing in the hub
[0063] Les murets radiaux dit centraux 45 de la deuxième pluralité s’étendent depuis le moyeu 21 , vers la paroi latérale 3, sur le fond 2 du flasque. The said central radial walls 45 of the second plurality extend from the hub 21, towards the side wall 3, on the bottom 2 of the flange.
[0064] Au moins une partie des murets radiaux centraux coupe le muret circonférentiel 44. Les cavités 4 sont alors définies par une portion du moyeu 21 ainsi que par deux murets de renfort radiaux centraux 45 et par une portion du muret circonférentiel 44. Les cavités définies par la pluralité de murets ont sensiblement toutes les mêmes dimensions et la même géométrie. [0065] Le rapport entre le nombre de murets radiaux périphériques 43 et le nombre de murets radiaux centraux 45 est avantageusement de l’ordre de 1.5. At least part of the central radial walls intersects the circumferential wall 44. The cavities 4 are then defined by a portion of the hub 21 as well as by two central radial reinforcement walls 45 and by a portion of the circumferential wall 44. The cavities defined by the plurality of low walls all have substantially the same dimensions and the same geometry. The ratio between the number of peripheral radial walls 43 and the number of central radial walls 45 is advantageously of the order of 1.5.
[0066] En variante le flasque comprend plusieurs murets circonférentiels 44 disposés concentriquement autour de l’axe X. De tels murets 44 coupent les murets radiaux 43, 45 en définissant une pluralité de cavités 40. [0066] As a variant, the flange comprises several circumferential walls 44 arranged concentrically around the X axis. Such walls 44 intersect the radial walls 43, 45 by defining a plurality of cavities 40.
[0067] Les murets 43, 45 ont une hauteur axiale qui décroit entre la paroi d’où ils s’étendent (c’est-à-dire la paroi latérale 2 ou le moyeu 21) et le muret circonférentiel 44. Un muret a par exemple une hauteur axiale qui décroit exponentiellement entre la paroi d’où il s’étend et le muret circonférentiel. Le muret circonférentiel a typiquement une hauteur de l’ordre de quelques millimètres, typiquement 10mm The low walls 43, 45 have an axial height which decreases between the wall from which they extend (that is to say the side wall 2 or the hub 21) and the circumferential wall 44. A low wall has for example an axial height which decreases exponentially between the wall from which it extends and the circumferential wall. The circumferential wall typically has a height of the order of a few millimeters, typically 10mm
[0068] Plus particulièrement le profil du muret radial central 45 présente, dans la direction radiale, une portion de hauteur axiale constante depuis le moyeu 21 puis une portion de hauteur axiale qui décroit exponentiellement jusqu’à atteindre la hauteur axiale du muret circonférentiel 44, à la jonction du muret radial 45 avec le muret circonférentiel 44. More particularly, the profile of the central radial wall 45 has, in the radial direction, a portion of constant axial height from the hub 21 then a portion of axial height which decreases exponentially until reaching the axial height of the circumferential wall 44, at the junction of the radial wall 45 with the circumferential wall 44.
[0069] Dans un mode préféré de réalisation, le flasque présente sur sa face de fond 2 côté extérieur, un maillage « en nid d’abeille » et sur sa face de fond côté intérieur des bras de renfort. In a preferred embodiment, the flange has on its bottom face 2 on the outer side, a "honeycomb" mesh and on its bottom face on the inner side of the reinforcing arms.
[0070] En variante les murets forment des cavités ouvertes. As a variant, the low walls form open cavities.
[0071] Le flasque plastique décrit ci-dessus est avantageusement obtenu par moulage. Les jonctions entre fond 2 et moyeu 21 ou fond 2 et paroi latérale 3 sont légèrement arrondies, ne présentent pas des angles saillants. Dans un tel flasque obtenu par moulage les murets 4 sont donc venus de matière avec le fond 2 du flasque. The plastic flange described above is advantageously obtained by molding. The junctions between bottom 2 and hub 21 or bottom 2 and side wall 3 are slightly rounded, do not have projecting angles. In such a flange obtained by molding, the walls 4 are therefore integral with the bottom 2 of the flange.
[0072] Afin de répondre aux exigences de solidité face aux contraintes thermique l’ajout d’éléments additionnels dans le plastique est envisagé. On utilise typiquement un matériau thermoplastique, ou un matériau plastique thermodurcissable ou encore un plastique chargé en fibre telle que de la fibre textile mécanique ou en charges telles que du carbone, du graphite, de la fibre de verre, de l’aluminium ou du cuivre. En variante on renforce le matériau plastique avec des éléments de renfort tels qu’un métal tel que de l’aluminium ou un alliage métallique au niveau du fond ou de la jupe du flasque. En variante le plastique est renforcé par du carbone ou une fibre textile ou une fibre animale ou végétale, telle que de la soie d’araignée ou du nerf de bœuf ou du kevlar ou chanvre. Ces éléments de renfort apportent un renfort très localisé dans des zones soumises à des contraintes particulièrement importantes. De plus de tels ajouts métalliques par exemple doivent se faire en très petite proportion pour ne pas risquer d’alourdir le poids du flasque. In order to meet the strength requirements in the face of thermal stresses, the addition of additional elements in the plastic is envisaged. Typically a thermoplastic material is used, or a thermosetting plastic material or else a plastic loaded with fiber such as mechanical textile fiber or fillers such as carbon, graphite, glass fiber, aluminum or copper. . As a variant, the material is reinforced plastic with reinforcing elements such as a metal such as aluminum or a metal alloy at the bottom or the skirt of the flange. As a variant, the plastic is reinforced with carbon or a textile fiber or an animal or vegetable fiber, such as spider silk or ox nerve or kevlar or hemp. These reinforcing elements provide very localized reinforcement in areas subject to particularly significant stresses. In addition, such metal additions, for example, must be made in very small proportions so as not to risk increasing the weight of the flange.
[0073] En considérant que ce qui précède est la description du flasque avant 16, le flasque arrière 17 comporte également un fond muni en son centre du logement de réception du roulement arrière, et une paroi latérale s’étendant axialement vers la paroi latérale du flasque avant. Les flasques avant et arrière sont solidarisés l’une à l’autre de sorte à former tout ou partie du carter contenant la machine. [0074] La fixation des flasques 16, 17 entre eux ou une pièce intermédiaire pourra être réalisée au moyen d'organes de fixation, tels que des vis, traversant des oreilles trouées dépassant radialement de la paroi latérale du flasque et destinées à coopérer avec des trous taraudés correspondants ménagés dans des oreilles dépassant radialement de la paroi latérale de l’autre flasque ou de la pièce intermédiaire. Considering that the above is the description of the front flange 16, the rear flange 17 also comprises a bottom provided at its center with the housing for receiving the rear bearing, and a side wall extending axially towards the side wall of the front flange. The front and rear flanges are secured to each other so as to form all or part of the housing containing the machine. The fixing of the flanges 16, 17 between them or an intermediate piece can be achieved by means of fixing members, such as screws, passing through perforated lugs projecting radially from the side wall of the flange and intended to cooperate with Corresponding threaded holes formed in lugs projecting radially from the side wall of the other flange or of the intermediate part.
[0075] Le plastique étant isolant thermiquement on prévoit avantageusement un refroidissement par liquide tel que de l’huile ou de l’eau. Since the plastic is thermally insulating, it is advantageous to provide cooling by liquid such as oil or water.
[0076] Dans une configuration avantageuse de machine illustrée à la figure 4, le flasque plastique avant 16 peut avantageusement présenter une double paroi latérale formant une chambre de refroidissement 160. In an advantageous machine configuration illustrated in FIG. 4, the front plastic flange 16 can advantageously have a double side wall forming a cooling chamber 160.
[0077] Plus précisément la paroi latérale du flasque avant est formée de deux parois annulaires radialement concentriques autour de l’axe X, une paroi radialement intérieure 31 et une paroi radialement extérieure 32. La paroi radialement intérieure 31 est positionnée en regard du bobinage et la paroi radialement extérieure 32 est positionnée en regard de l’extérieur. Chaque paroi 31 , 32 s’étend le long de l’axe X sous forme annulaire entre une extrémité reliée au fond 2. Les deux parois de la double paroi sont donc reliées entre elles au niveau du fond. Les extrémités libres des parois intérieure et extérieure sont les extrémités non reliées entre elles et non reliées à la paroi transversale. More specifically, the side wall of the front flange is formed of two annular walls radially concentric around the axis X, a radially inner wall 31 and a radially outer wall 32. The radially inner wall 31 is positioned facing the coil and the radially outer wall 32 is positioned facing the outside. Each wall 31, 32 extends along the X axis in annular form between one end connected to the bottom 2. The two walls of the double wall are therefore connected to each other at the level of the background. The free ends of the inner and outer walls are the ends not connected to each other and not connected to the transverse wall.
[0078] Le flasque arrière 17 présente par exemple uniquement un fond sans extension sous forme d’une paroi latérale. La paroi latérale du flasque avant 3 couvre le stator 15 sur toute sa hauteur et le flasque arrière 17 est un couvercle sans paroi latérale, les flasques avant et arrière ne présentent pas de surface de recouvrement autour de l’axe X. The rear flange 17 has for example only a bottom without extension in the form of a side wall. The side wall of the front flange 3 covers the stator 15 over its entire height and the rear flange 17 is a cover without a side wall, the front and rear flanges do not have an overlap surface around the X axis.
[0079] La chambre de refroidissement 160 est alors logée dans la paroi latérale du flasque avant, entre les deux parois concentriques. Le fond du flasque arrière 17 est en appui au niveau d’une zone périphérique sur l’extrémité libre de la paroi latérale du flasque avant, opposée au fond du flasque avant. Le fluide de refroidissement circule entre les deux parois concentriques. The cooling chamber 160 is then housed in the side wall of the front flange, between the two concentric walls. The bottom of the rear flange 17 bears at the level of a peripheral zone on the free end of the side wall of the front flange, opposite the bottom of the front flange. The cooling fluid circulates between the two concentric walls.
[0080] La paroi concentrique extérieure 32 présente alors avantageusement des murets de renfort 4 formant au moins localement une structure en nid d’abeille. On limite ainsi le bruit magnétique. The outer concentric wall 32 then advantageously has reinforcing walls 4 forming at least locally a honeycomb structure. Magnetic noise is thus limited.

Claims

Revendications Claims
1. Flasque plastique pour machine électrique tournante d’axe X comprenant un fond (2) qui s’étend transversalement à l’axe X et une paroi latérale (3) s’étendant axialement depuis un pourtour du fond, caractérisé en ce que l’un au moins du fond (2) et de la paroi latérale (3) a une surface d’où s’étend au moins un muret de renfort (4). 1. Plastic flange for an X axis rotary electric machine comprising a bottom (2) which extends transversely to the X axis and a side wall (3) extending axially from a periphery of the bottom, characterized in that the 'at least one of the bottom (2) and of the side wall (3) has a surface from which extends at least one reinforcing wall (4).
2. Flasque plastique selon la revendication 1 obtenu par moulage. 2. Plastic flange according to claim 1 obtained by molding.
3. Flasque plastique selon l’une quelconque des revendications précédentes comprenant une pluralité de murets (4) définissant des cavités fermées. 3. Plastic flange according to any one of the preceding claims comprising a plurality of walls (4) defining closed cavities.
4. Flasque selon la revendication 3 dans lequel les cavités (40) sont sensiblement identiques les unes aux autres. 4. Flange according to claim 3 wherein the cavities (40) are substantially identical to each other.
5. Flasque selon l’une quelconque des revendications précédentes dans lequel les cavités (40) ont une section dans un plan transverse à l’axe X présentant au moins deux axes de symétrie. 5. Flange according to any one of the preceding claims wherein the cavities (40) have a section in a plane transverse to the X axis having at least two axes of symmetry.
6. Flasque selon l’une quelconque des revendications précédentes dans lequel les cavités (40) ont une section hexagonale. 6. Flange according to any one of the preceding claims, in which the cavities (40) have a hexagonal section.
7. Flasque selon l’une quelconque des revendications précédentes dans lequel l’épaisseur d’au moins un des murets (4) est comprise entre le quart de l’épaisseur et une fois l’épaisseur du fond (2) ou de la paroi latérale (3) dont il s’étend, et préférentiellement de l’ordre de la moitié de l’épaisseur du fond ou de la paroi latérale dont il s’étend. 7. Flange according to any one of the preceding claims wherein the thickness of at least one of the walls (4) is between a quarter of the thickness and once the thickness of the bottom (2) or of the wall. side (3) from which it extends, and preferably of the order of half the thickness of the bottom or of the side wall from which it extends.
8. Flasque selon l’une quelconque des revendications précédentes dans lequel la hauteur axiale d’au moins un des murets (4) est comprise entre la moitié et trois fois l’épaisseur du fond (2) ou de la paroi latérale (3) dont il s’étend, et préférentiellement de l’ordre de l’épaisseur du fond ou de la paroi latérale dont il s’étend. 8. Flange according to any one of the preceding claims wherein the axial height of at least one of the walls (4) is between half and three times the thickness of the bottom (2) or of the side wall (3). from which it extends, and preferably of the order of the thickness of the bottom or of the side wall from which it extends.
9. Flasque selon l’une quelconque des revendications précédentes dans lequel la surface est une surface extérieure, le flasque comprenant également une surface intérieure, une autre pluralité de murets s’étendant aussi depuis la surface intérieure, au moins un muret de la surface extérieure (41) étant axialement aligné avec au moins un muret de la surface intérieure (42). 9. Flange according to any one of the preceding claims wherein the surface is an exterior surface, the flange also comprising an interior surface, another plurality of walls also extending from the interior surface, at least one wall of the exterior surface. (41) being axially aligned with at least one wall of the interior surface (42).
10. Flasque plastique selon la revendication 3 comprenant également une ouverture centrale (20) de passage de l’arbre et un moyeu (21) s’étendant depuis l’ouverture centrale, et dans lequel les cavités sont formées sur le fond du flasque par : d’une part l’une des deux pluralités parmi : une pluralité de murets radiaux périphériques (43) s’étendent radialement par rapport à l’axe de la machine depuis la paroi latérale et une pluralité de murets radiaux centraux (45) s’étendent radialement par rapport à l’axe de la machine depuis le rebord, et. d’autre part un muret circonférentiel (44) s’étendant autour de l’axe de la machine transversalement à la pluralité de murets radiaux (43, 45). 10. Plastic flange according to claim 3 also comprising a central opening (20) for the passage of the shaft and a hub (21) extending. from the central opening, and in which the cavities are formed on the bottom of the flange by: on the one hand one of two pluralities among: a plurality of peripheral radial walls (43) extend radially with respect to the axis of the machine from the side wall and a plurality of central radial walls (45) extend radially with respect to the axis of the machine from the rim, and. on the other hand, a circumferential wall (44) extending around the axis of the machine transversely to the plurality of radial walls (43, 45).
11. Flasque selon la revendication 10 comprenant une pluralité de murets radiaux centraux (45), et une pluralité de murets radiaux périphériques (43), le rapport entre le nombre de murets radiaux périphériques et le nombre de murets radiaux centraux étant compris entre 1 et 2 et préférentiellement égal à 1.5. 11. Flange according to claim 10 comprising a plurality of central radial walls (45), and a plurality of peripheral radial walls (43), the ratio between the number of peripheral radial walls and the number of central radial walls being between 1 and 2 and preferably equal to 1.5.
12. Flasque selon l’une quelconque des revendications 10 à 11 dans lequel deux murets angulairement adjacents d’une des pluralités de murets sont angulairement séparés d’un angle sensiblement compris entre 10° et 15°, mesuré depuis l’axe X dans un plan perpendiculaire à cet axe. 12. Flange according to any one of claims 10 to 11 wherein two angularly adjacent walls of one of the plurality of walls are angularly separated by an angle substantially between 10 ° and 15 °, measured from the X axis in a plane perpendicular to this axis.
13. Flasque selon l’une quelconque des revendications 10 à 12 dans lequel au moins l’un des murets (43, 45) à une hauteur axiale qui augmente en s’éloignant du muret circonférentiel. 13. Flange according to any one of claims 10 to 12 wherein at least one of the walls (43, 45) has an axial height which increases away from the circumferential wall.
14. Flasque selon l’une quelconque des revendications précédentes dans lequel une première surface extérieure comprend des murets selon l’une quelconque des revendications 4 à 8 et dans lequel une deuxième surface intérieure comprend des murets selon l’une quelconque des revendications 10 à 13. 14. Flange according to any one of the preceding claims wherein a first exterior surface comprises walls according to any one of claims 4 to 8 and wherein a second interior surface comprises walls according to any one of claims 10 to 13 .
15. Machine électrique tournante comprenant un rotor, un stator, une chambre de refroidissement, un flasque selon l’une quelconque des revendications précédentes 1 à 14 15. A rotating electrical machine comprising a rotor, a stator, a cooling chamber, a flange according to any one of the preceding claims 1 to 14
PCT/EP2021/054803 2020-03-09 2021-02-26 Plastic flange with reinforcing rim for a rotating electrical machine WO2021180489A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202180019820.3A CN115244828A (en) 2020-03-09 2021-02-26 Plastic flange with reinforced rim for a rotating electrical machine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR2002286A FR3108000B1 (en) 2020-03-09 2020-03-09 Plastic flange fitted with reinforcing walls for a rotating electrical machine
FRFR2002286 2020-03-09

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201669842U (en) * 2010-04-24 2010-12-15 宁海茂盛模具有限公司 Hexagonal honeycomb-shaped structural reinforcing rib of shell plate for injection molding product
WO2014000479A1 (en) * 2012-06-29 2014-01-03 中山大洋电机股份有限公司 Novel end cover and which for use in external rotor motor
US20180048212A1 (en) * 2010-08-17 2018-02-15 Nidec Motor Corporation Direct drive rotor with metal coupler

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201669842U (en) * 2010-04-24 2010-12-15 宁海茂盛模具有限公司 Hexagonal honeycomb-shaped structural reinforcing rib of shell plate for injection molding product
US20180048212A1 (en) * 2010-08-17 2018-02-15 Nidec Motor Corporation Direct drive rotor with metal coupler
WO2014000479A1 (en) * 2012-06-29 2014-01-03 中山大洋电机股份有限公司 Novel end cover and which for use in external rotor motor

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CN115244828A (en) 2022-10-25
FR3108000B1 (en) 2023-05-12

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