EP3991276A1 - Carter pour machine électrique tournante comprenant un palier plastique - Google Patents
Carter pour machine électrique tournante comprenant un palier plastiqueInfo
- Publication number
- EP3991276A1 EP3991276A1 EP20734753.5A EP20734753A EP3991276A1 EP 3991276 A1 EP3991276 A1 EP 3991276A1 EP 20734753 A EP20734753 A EP 20734753A EP 3991276 A1 EP3991276 A1 EP 3991276A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bearing
- skirt
- wall
- chamber
- transverse wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
- H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
-
- 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
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
Definitions
- the invention relates in particular to a rotating electrical machine
- a reversible machine is a rotating electric 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 electric machine comprises a movable rotor in rotation
- 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 bearings forming the casing.
- the housing helps maintain and protect the assembly formed by the stator and the rotor.
- a cooling circuit in which a cooling fluid advantageously circulates should in particular be provided at the level of the bearings of the casing to cool the machine.
- Such a cooling circuit comprises
- At least one cooling chamber for example formed by two walls extending axially around the axis of the machine and each belonging to a different bearing, and between which is disposed at least one seal ensuring the sealing of the chamber as described in document FR3057414.
- the casing for a rotary electrical machine comprises a first bearing and a second bearing, at least the first bearing being made of plastic, said first bearing comprising a transverse wall and a skirt extending from the transverse wall between one end connected to the transverse wall and a free end, the casing also comprising a first cooling chamber, said first cooling chamber being housed at least in part in the skirt of the first bearing.
- cooling chamber is made of plastic, that is to say non-porous, leakage problems are limited. Corrosion problems and contamination of the cooling fluid are also avoided.
- the skirt of the first bearing comprises a double wall, the first cooling chamber being housed in the double wall of the skirt;
- the casing comprises at least one seal arranged between the bearings to seal the first cooling chamber
- the first bearing comprises at least one radial reinforcement element, overmolded in the skirt of the bearing;
- the skirt of the first bearing comprises an opening provided with a sleeve
- At least a portion of the plastic forming the skirt of the first bearing is loaded with charges suitable for increasing the thermal conductivity of said portion of plastic;
- the double wall of the skirt of the first bearing comprises an inner wall and an outer wall, the transverse wall of the second bearing resting on the free axial end of the skirt of the first bearing, the first cooling chamber being delimited by the inner and outer walls of the skirt of the first bearing and by the transverse wall of the second bearing;
- the second bearing also comprises a skirt extending from a transverse wall between an end connected to the transverse wall and a free end, the skirt of the second bearing also comprising a double wall, said double wall comprising an inner wall and a outer wall, the first cooling chamber being delimited by the two inner walls joined along their respective free ends and by the two outer walls joined along their respective free ends;
- the casing comprises a second cooling chamber, said
- the invention also relates to an X-axis rotary electrical machine comprising a rotor movable in rotation about the X axis, a fixed stator surrounding the rotor comprising a body, and such a housing.
- double wall is understood to mean a first wall
- annular and a second annular wall connected by at least one of their respective axial ends.
- Figure 1 is a longitudinal sectional view of a rotary electrical machine comprising a housing with a first cooling chamber according to a first embodiment of the present invention
- Figure 2 is a part of the longitudinal sectional view of the machine in the first embodiment
- Figure 3 is a longitudinal sectional view of the rotary electrical machine comprising a housing with a first cooling chamber according to a second embodiment of the present invention
- Figure 4 is a perspective view of the rotary electrical machine illustrating a second cooling chamber of the casing
- the exterior and interior refer to the X axis 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.
- the radial directions, the exterior or interior denominations are assessed with respect to the same X axis, the interior denomination
- the upper and lower denominations as well as above / below or even front / rear refer to the pulley.
- an upper or top or front face being a face oriented in the direction of the pulley while a lower or bottom or rear face being a face oriented in the opposite direction of the pulley.
- Figure 1 shows a rotary electrical machine 10 compact
- This electric machine rotary 10 transforms 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 comprises a casing 1 1. Inside this casing 1 1, it further comprises a shaft 13 mounted in rotation with respect to the casing around the axis X, 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 an axis X.
- a fluted end of the shaft 13 ensures the mechanical connection of the electrical machine with an external element to transmit the
- the rotor 12 has a body in the form of a bundle of sheets.
- the stator 15 has a body in the form of a bundle of sheets provided with notches, equipped with insulation with notches for mounting a connected electrical winding.
- the coil is electrically connected to an electronic control module 24.
- the housing 1 1 comprises assembled a first bearing which will be in the following description the front bearing 16, and a second bearing, which will be in the following description the rear bearing 17. At least one of the two bearings is made of plastic.
- the bearings 16, 17 are of hollow shape and are obtained for example by molding.
- the bearing may in particular be in thermoplastic.
- the bearing could be in thermo-hard.
- a cooling circuit is provided to cool the machine.
- the cooling circuit allowing the flow of a cooling fluid inside the machine 10.
- the cooling fluid is a water-based fluid containing, where appropriate, antifreeze.
- the cooling fluid could be oil-based.
- the cooling circuit advantageously comprises a first cooling chamber 49, delimited by the front and rear bearings, which allows the fluid to circulate around the assembly of the stator 15 and of the rotor 12 to cool the machine.
- the front bearing 16 comprises a transverse wall 45 provided at its center with the housing for receiving the rear bearing 18 and defining an opening for the passage of the shaft 13.
- the front bearing 16 further comprises a skirt 47 projecting from an outer periphery of the transverse wall 45.
- the skirt has an annular shape of axial orientation extending towards the rear bearing 17.
- the rear bearing 17 also comprises a transverse wall 48 provided at its center with the housing for receiving the rear bearing 19. The front and rear bearings are secured to one another so as to form the casing containing the machine.
- the rear bearing 17 has for example only a transverse wall 48 without extension in the form of a skirt.
- the front bearing skirt 47 covers the stator 15 over its entire height and the rear bearing 17 is a skirtless cover, the front and rear bearings do not have an overlap surface around the X axis.
- the skirt of the front bearing 47 comprises a double wall, that is to say that the skirt of the front bearing is formed of two annular walls radially concentric around the axis X, a radially inner wall 47a and a radially outer wall 47b, as illustrated in FIG. 2.
- the radially inner wall 47a is positioned facing the coil and the radially outer wall 47b is positioned facing the outside.
- Each wall 47a, 47b extends along the X axis in annular form between one end connected to the transverse wall of the bearing 45 and an opposite free end.
- the two walls 47a, 47b of the double wall are therefore connected to one another at the level of the transverse wall of the bearing 45.
- the free ends of the internal and external walls are the ends not connected to each other and not connected to the transverse wall.
- the skirt of the front bearing 47 therefore has a U-shape, one of the branches of the U being closer to the machine and one of the branches of the U being further away from the machine.
- Such a form of bearing is in particular easily obtained by molding.
- the first cooling chamber 49 is then housed in the skirt 47 of the front bearing, between the two walls of the skirt of the front bearing 47a, 47b.
- the transverse wall 48 of the rear bearing 17 bears at the level of a peripheral zone on the free end of the skirt of the front bearing 16, opposite the transverse wall of the front bearing 45.
- the cooling fluid circulates between the two walls. 47a, 47b of the bearing skirt. More precisely, the cooling chamber 49 is delimited by the inner and outer walls, and by the portion of the peripheral zone of the transverse wall of the rear bearing 48.
- each free end of each wall of the front bearing 47a, 47b advantageously has a groove 470a, 470b
- the first cooling chamber 49 comprises two O-rings 51, arranged respectively in each of the two grooves present at the level of the free ends of the inner walls 47a and outer 47b.
- the first cooling chamber 49 thus formed extends so as to surround the stator 15, over approximately 360 degrees, therefore having an annular shape.
- the fixing of the bearings 16, 17 between them to form the first chamber 49 can be achieved by means of fixing members, such as screws, passing through perforated ears projecting radially from the skirt of the bearing and intended to cooperate with corresponding threaded holes formed in lugs projecting radially from the cover.
- the rear bearing comprises a double wall and carries the first cooling chamber and that the front bearing is in the form of a cover (not shown).
- the rear bearing 17 comprises a skirt 50 projecting from an outer periphery of the wall transverse 48.
- the skirt of the first bearing 47 has a height along the X axis greater than or equal to the height of the body of the stator along the X axis, and the skirt of the second bearing 50 has a height along the X axis that is much lower. at the height along the X axis of the skirt of the first bearing 47, typically at the fifth of the height of the skirt of the first bearing 47.
- the front 16 and rear 17 bearings respectively comprise a transverse wall 45, 48 and a skirt 47, 50 projecting from an outer periphery of the transverse wall 45, 48.
- Each skirt 47, 50 has an annular shape
- the skirts 47, 50 are directed axially towards one another and are secured to one another so as to form the casing containing the machine.
- the skirts of the front 47 and rear 50 bearings each comprise a double wall, as described in the first embodiment.
- the rear bearing skirt 50 therefore also includes two radially concentric walls around the X axis, inner and outer 50a, 50b.
- the inner and outer walls of the double wall 50a, 50b are interconnected at the level of the transverse wall 48.
- the free ends of the inner 50a and outer 50b walls are the ends not connected to each other and not connected to the transverse wall 48.
- the skirts of the front and rear bearings 47 and 50 are assembled at their free ends, without overlap between the skirts.
- the two inner walls 47a, 50a are assembled along their respective free ends, just as the two outer walls 47b, 50b are assembled along their respective free ends.
- the cooling fluid circulates in the closed annular volume thus delimited by said four walls forming the first cooling chamber, surrounding the stator over 360 °.
- Gaskets are in particular provided at the junction between the double walls 47a, 50a as well as between the walls 47b, 50b so as to ensure the sealing of the chamber.
- each free end of each wall of the front bearing 47a, 47b and each free end of each wall of the rear bearing 50a, 50b advantageously has a groove 470a, 470b, 500a, 500b, respectively, adapted to house an O-ring therein so as to seal the junction between the walls 47a, 50a and between the walls 47b, 50b.
- the cooling circuit comprises a second chamber 52 allowing the fluid to circulate at the level of the electronic control module 24.
- the electric control module 24 advantageously comprises a
- heat sink 240 ensuring its cooling on which are fixed in particular power modules making it possible to control the rotating electrical machine 10 in motor mode or in alternator mode.
- the electric control module 24 is mounted pressed, via the heat sink 240, against the rear face of the transverse wall 45 of the rear bearing 17.
- the second chamber makes it possible to circulate the fluid at the level of the electronic control module 24 and of the dissipator 240 in order to evacuate the calories generated by the electrical control module 24.
- the chamber 52 is hollowed out in the transverse wall 48 of the rear bearing.
- the second chamber 52 is therefore delimited by the transverse wall of the rear bearing 17, and an axial end face of the heat sink (not visible in FIG. 4), in this case the front face.
- the chamber is also delimited by a seal 520 mounted tight between the rear bearing 17 and the heat sink. This seal thus forms a side wall of the chamber.
- the closed contour defining that of the chamber may be of the toric type.
- the seal defines an elongated, closed, C-shaped volume whose ends are very close, so that the chamber extends circumferentially more than 300 degrees and almost 360 degrees to ensure cooling of the entire surface of the heat sink 240.
- the seal can be maintained in the groove during the assembly operations to facilitate the production of the electric machine.
- the heat sink 240 can be hollowed out in the surface delimited by the seal to increase the volume of the chamber.
- the volume hollowed out in the element is delimited by the receiving groove of the seal.
- the use of the gasket makes it possible to have to dig only one part, which facilitates the realization of the chamber.
- only the rear bearing 17 is hollowed out.
- the second cooling chamber 52 is arranged to allow the cooling of capacitors and / or power modules of the electric control module. To this end, the second cooling chamber 52 passes below these elements. In other words, there is an at least partial superposition in axial projection along the X axis between the projected surface of these components and the projected surface of the second cooling chamber 52.
- the dissipator 240 may advantageously comprise fins at the
- Such fins allow in particular improved cooling of the electronic control module 24, in
- the fins are advantageously bathed in the cooling fluid so as to optimize the cooling.
- the second chamber 52 is integrated into the heat sink 240, that is to say that the second chamber 52 can be produced during the molding or machining of said
- heat sink 240 to define a hollow volume inside thereof.
- the second chamber 52 is thus delimited by internal faces of the dissipator 240.
- the two chambers 49, 52 are interconnected by an intermediate channel (not shown) allowing the circulation of the cooling fluid between the two chambers.
- This intermediate channel is materialized by a fluid conduit connecting an opening in the wall of the second chamber and an opening in the wall of the first chamber.
- the fluid advantageously circulates first in the second chamber 52 to cool the electronics then around the stator.
- the second chamber 52 comprises an inlet connected to the inlet of the cooling circuit and an outlet connected to the intermediate channel.
- the first chamber 49 comprises an inlet connected to the intermediate channel then an outlet connected to the outlet of the cooling circuit.
- the fluid which enters the second chamber 52 via the inlet of the second chamber circulates in said chamber before being transferred to the first chamber 49 and then discharged via the outlet of the first chamber.
- a sleeve 472 for example made of stainless steel for example molded, forms an inlet connected to the intermediate channel.
- the sleeve will be fitted or glued.
- a flexible tube may in particular be held by a plastic or metal collar at the level of the sleeve to allow the entry or exit of fluid.
- a self-regulating valve may in particular be provided at the level of the coolant inlet sleeve from the second chamber to the first chamber, to adapt the pressure of the coolant arriving in the first chamber as a function of the temperature of the fluid. having already cooled the electronics.
- the inner wall of the skirt 47a, 50a near the stator will advantageously be loaded, at least locally, by loads increasing the thermal conductivity of the plastic.
- a portion of the inner wall of the skirt 47a separating the liquid contained in the chamber 49 and the stator 15 will for example be charged.
- an insert for example metallic, is molded in said inner wall of the skirt of the bearing 47a, 50a to improve heat exchanges. More specifically, the insert forms a portion of the wall facing the stator package, said insert being molded at its contour in the plastic bearing.
- the inner wall of the skirt 47a, 50a therefore comprises a metal portion and a plastic portion.
- a radial reinforcing element 473 for example metallic, is advantageously molded in the skirt of the front bearing 47, so as to avoid the problems of thermal expansion of the front bearing, for example.
- the radial reinforcement element prevents deformation of the bearing skirt under radial stresses.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Motor Or Generator Cooling System (AREA)
- Mounting Of Bearings Or Others (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1907015A FR3098051B1 (fr) | 2019-06-27 | 2019-06-27 | Carter pour machine électrique tournante comprenant un palier plastique |
| PCT/EP2020/068296 WO2020260713A1 (fr) | 2019-06-27 | 2020-06-29 | Carter pour machine électrique tournante comprenant un palier plastique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3991276A1 true EP3991276A1 (fr) | 2022-05-04 |
Family
ID=69743272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20734753.5A Pending EP3991276A1 (fr) | 2019-06-27 | 2020-06-29 | Carter pour machine électrique tournante comprenant un palier plastique |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3991276A1 (fr) |
| FR (1) | FR3098051B1 (fr) |
| WO (1) | WO2020260713A1 (fr) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0589187B1 (fr) * | 1992-09-24 | 1997-05-14 | FHP Motors GmbH | Machine électrique entièrement fermeé, refroidie en surface par liquide |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2717638B1 (fr) * | 1994-03-18 | 1996-04-26 | Valeo Equip Electr Moteur | Alternateur de véhicule automobile à refroidissement par eau. |
| DE102009010461A1 (de) * | 2009-02-13 | 2010-08-19 | Alfred Kärcher Gmbh & Co. Kg | Motorpumpeneinheit |
| DE102010041589A1 (de) * | 2010-09-29 | 2012-03-29 | Robert Bosch Gmbh | Gehäuseelement zur Aufnahme einer Leistungselektronik einer Elektromaschine, Gehäuse für eine Elektromaschine, Werkzeug zur Herstellung eines Gehäuseelementes sowie Verfahren zur Herstellung eines Gehäuses für eine Elektromaschine |
| DE102016103525A1 (de) * | 2016-02-29 | 2017-08-31 | Pierburg Gmbh | Gebläse für einen Verbrennungsmotor |
| FR3057414B1 (fr) | 2016-10-10 | 2018-10-12 | Valeo Equipements Electriques Moteur | Machine electrique tournante munie d'une chambre de refroidissement formee par un joint |
| DE102017221835A1 (de) * | 2017-12-04 | 2019-06-06 | Mahle International Gmbh | Elektrische Maschine, insbesondere für ein Fahrzeug |
-
2019
- 2019-06-27 FR FR1907015A patent/FR3098051B1/fr active Active
-
2020
- 2020-06-29 EP EP20734753.5A patent/EP3991276A1/fr active Pending
- 2020-06-29 WO PCT/EP2020/068296 patent/WO2020260713A1/fr not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0589187B1 (fr) * | 1992-09-24 | 1997-05-14 | FHP Motors GmbH | Machine électrique entièrement fermeé, refroidie en surface par liquide |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3098051B1 (fr) | 2021-07-02 |
| FR3098051A1 (fr) | 2021-01-01 |
| WO2020260713A1 (fr) | 2020-12-30 |
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