WO2024251524A1 - Elément de répartition de flux au sein d'un arbre creux - Google Patents
Elément de répartition de flux au sein d'un arbre creux Download PDFInfo
- Publication number
- WO2024251524A1 WO2024251524A1 PCT/EP2024/064145 EP2024064145W WO2024251524A1 WO 2024251524 A1 WO2024251524 A1 WO 2024251524A1 EP 2024064145 W EP2024064145 W EP 2024064145W WO 2024251524 A1 WO2024251524 A1 WO 2024251524A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shaft
- hole
- bore
- central bore
- section
- 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.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/003—Couplings; Details of shafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C3/00—Shafts; Axles; Cranks; Eccentrics
- F16C3/02—Shafts; Axles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
Definitions
- TITLE Flow distribution element within a hollow shaft.
- the invention relates to a flow distribution element within a hollow shaft.
- the invention also relates to an electric motor rotor shaft comprising such a distribution element.
- the invention also relates to an electric motor comprising such a shaft or such a distribution element.
- the invention also relates to a vehicle comprising such an electric motor.
- a vehicle in particular a motor vehicle, generally comprises at least one electric traction and/or propulsion motor for moving such a vehicle. This is particularly the case for hybrid or electric vehicles.
- Such an electric motor comprises a rotor that rotates in proximity to a stator.
- the rotor has a high, even very high, rotation speed, for example of the order of 16,000 revolutions per minute.
- Such an electric motor heats up during operation, although it must not exceed a limit temperature, for example of the order of 140 degrees Celsius. Indeed, beyond this limit temperature, the magnets of such an electric motor lose, at least partially, their magnetic properties and this results in malfunctions of the electric motor.
- such a vehicle typically includes a gearbox for adjusting the rotational speed of a ground-engaging element such as a wheel relative to the rotational speed output from the electric motor.
- a gearbox for adjusting the rotational speed of a ground-engaging element such as a wheel relative to the rotational speed output from the electric motor.
- Such an electric motor is typically arranged, at least partially, within such a gearbox.
- Such a gearbox speeds also reach a high temperature in operation, for example of the order of 100 degrees Celsius.
- the present invention aims to provide a distribution element remedying the above drawbacks.
- the invention makes it possible to obtain an electric motor rotor comprising a shaft which provides cooling of the motor, compatible with the high speed of the rotor and ensuring cooling at each end of the rotor although the admission of a cooling fluid is only at one end of the rotor.
- the invention relates to a distribution element intended to be attached within a bore of a shaft so as to form, possibly in cooperation with a surface of the bore, in this bore two fluid circuits, in particular oil circuits, the distribution element comprising:
- the invention also relates to a shaft for a rotor of an electric motor, in particular of a traction and/or propulsion motor of a motor vehicle, the shaft comprising:
- section of the shaft extending axially over a given length of the shaft and being intended to extend substantially opposite a stator of such an electric motor, the section comprising a first part and a second part on either side of a plane passing through the axis of the shaft, the section comprising a first axial end and a second axial end,
- the shaft comprising a distribution element as defined above attached within the central bore so as to supply oil to the first hole and the second hole.
- the distribution element can be shaped so as to create, in the central bore, a first oil supply chamber for the first hole and a second oil supply chamber for the second hole, the first and second chambers being able to communicate with the open end of the central bore.
- the distribution element may comprise the second oil supply chamber, the second chamber may comprise an evacuation orifice arranged opposite the second hole.
- the second chamber may have a hollow half-cylinder shape extending into the second portion of the section, the second chamber may have a half-disc shaped bottom extending perpendicular to the axis of the shaft.
- the distribution element may comprise a hollow half-cylinder shape which may extend into the first part of the section.
- the positioning element may be in contact with the central bore, in particular the positioning element may have the shape of a hollow cylinder with a diameter equal to or substantially equal to the diameter of the central bore so as to be force-fitted and/or to stick within the central bore.
- the partition wall may extend substantially centered on the plane and a half circular pellet may extend radially from the partition wall into the central bore, within the second portion of the section, the half circular pellet may be arranged between the first hole and the second hole while being spaced from the first hole and the second hole.
- the positioning element may be a cylindrical part of diameter equal or substantially equal to the diameter of a non-opening end of the bore so as to be force-fitted and/or glued at the non-opening end.
- the invention also relates to an electric motor, in particular a traction and/or propulsion motor for a vehicle, the electric motor comprising a rotor shaft as defined above or a distribution element as defined above.
- the invention also relates to a vehicle, in particular a motor vehicle, comprising a gearbox, the vehicle comprising an electric motor as defined above arranged at least partially within the gearbox.
- Figure 1 is a schematic view of a motor vehicle according to one embodiment of the invention.
- Figure 2 is a sectional view of an electric motor comprising a distribution element according to a first embodiment of the invention.
- Figure 3 is a front view of the distribution element according to the first embodiment of the invention.
- Figure 4 is a perspective view of the distribution element according to the first embodiment of the invention.
- Figure 5 is a sectional view of an electric motor comprising a distribution element according to a second embodiment of the invention.
- Figure 6 is a perspective view of the distribution element according to the second embodiment of the invention.
- the direction in which a vehicle, in particular a motor vehicle, moves in a straight line is defined as the longitudinal direction X.
- the direction perpendicular to the longitudinal direction located in a plane parallel to the ground, is called the transverse direction Y.
- the third direction, perpendicular to the other two, is called the vertical direction Z.
- a direct XYZ reference frame is used in which X is the longitudinal direction in the front-rear direction of the vehicle, therefore directed towards the rear, Y is the transverse direction directed towards the right and Z is the vertical direction directed upwards.
- the forward direction corresponds to the direction in which the vehicle usually moves in the longitudinal direction and is opposite to the rear direction.
- a vehicle in particular a motor vehicle 1 , comprises a gearbox 5.
- the vehicle comprises an electric motor 2, for example an electric traction and/or propulsion motor of the vehicle.
- the electric motor 2 is arranged, at least partially, within the gearbox 5.
- the electric motor 2 comprises a shaft 10, a rotor 3 and a stator 4.
- the shaft 10 comprises an axis A.
- the shaft 10 is the shaft of the rotor 3.
- the shaft 10 and the rotor 3, the rotor 3 being for example fixed on the shaft 10, are intended to rotate around the axis A, or substantially around the axis A, for example at a very high speed, for example of the order of 16,000 revolutions/minute.
- the rotor 3 is arranged opposite the stator 4.
- the shaft 10 comprises a bore 20, preferably a central bore 20, i.e. centered on the axis A of the shaft.
- the shaft 10 comprises an open end 24 of the central bore 20.
- the bore is intended to receive a fluid at the open end 24.
- the shaft 10 of the rotor 3 comprises a distribution element or distributor.
- the distribution element 30 is attached within the bore 20 of the shaft 10.
- the distribution element 30 then forms, possibly in cooperation with a surface 25 of the bore, two fluid circuits in this bore.
- fluid we preferably mean oil, for example lubricating and/or cooling oil.
- the fluid inlet or admission is ensured at the level of the emerging end 24 of the shaft 10.
- the bore 20 is formed, machined, from this emerging end 24.
- a first fluid circuit C1 extends from the inlet to a first hole 21.
- a second fluid circuit C2 extends from the inlet 24 to a second hole 22.
- the first circuit C1 and the second circuit C2 are materialized at the level of the inlet and at the outlet of each hole by an arrow.
- the distribution element 30 comprises a positioning element 39 for positioning the distribution element 30 in the bore 20.
- the positioning element 39 is in contact, or substantially in contact, with the central bore 20.
- the positioning element 39 has the shape of a hollow cylinder with a diameter equal to or substantially equal to the diameter of the central bore 20.
- the cylindrical positioning element 39 comprises a shoulder 38 intended to come into abutment against or at the open end of the shaft 10 or intake 24.
- the distribution element 30 also comprises at least one separation wall 37 of a flow C separating into two flows or circuits C1, C2 of fluid, as illustrated in particular in FIG. 4.
- the shaft 10 for the rotor 3 of the electric motor 2 further comprises a section 15, or cylindrical portion, of the shaft 10 extending axially over a given length L15 of the shaft 10 illustrated in FIGS. 2 and 5.
- the section 15 is intended to extend, or extend substantially, opposite the stator 4 of the electric motor 2. More precisely, the section 15 comprises a first part 16 and a second part 17 on either side of a plane P passing through the axis A of the shaft 10.
- the section 15 is divided, cut, separated in two, fictitiously, by the plane P so as to obtain the first part 16 (portion of the shaft 10 extending below the axis line A in FIGS. 2 and 5 and over the axial length L15, the plane P extending perpendicular to this axis). view) and the second part 17 (portion of the shaft 10 extending above the axis line A in figures 2 and 5 and over the axial length L15, the plane P extending perpendicular to this view).
- the section 15 comprises a first axial end 11 and a second axial end 12 illustrated in dotted lines in FIGS. 2 and 5.
- the shaft 10 comprises the first hole 21.
- the first hole 21 extends for example radially from the central bore 20, within the first part 16 of the section 15, and close to the first axial end 11 of the section 15.
- the first hole 21 is circular and/or the axis of the first hole 21 extends perpendicular to the plane P.
- the first hole 21 extends from the central bore 20 to an external surface 18 of the first part 16 of the section 15.
- several holes, radial or not, are provided so as to extend from the central bore 20 to the external surface 18 of the first part 16 of the section 15.
- the shaft 10 comprises the second hole 22.
- the second hole 22 extends for example radially from the central bore 20, within the second part 17 of the section 15, and close to the second axial end 12 of the section 15.
- the second hole 22 is circular and/or the axis of the second hole 22 extends perpendicular to the plane P.
- the second hole 22 extends from the central bore 20 to an external surface 19 of the second part 17 of the section 15.
- several holes, radial or not, are provided so as to extend from the central bore 20 to the external surface 19 of the second part 17 of the section 15.
- the shaft 10 comprises the distribution element reported, fixed, glued, fitted within the central bore 20.
- the fluid admitted at the level of the emerging end 24 of the bore 20 communicates with, supplies, the first hole 21 and the second hole 22.
- the distribution element 30 is shaped so as to create, in the central bore, a first chamber 31 for supplying the first hole 21 and a second chamber 32 for supplying the second hole 22.
- the first and second chambers 31, 32 communicate with the open end 24 of the central bore 20.
- the distribution element 30 which creates the second supply chamber 32.
- the second chamber 32 then has the shape of a hollow half-cylinder 35 extending into the second part 17 of the section 15 of the shaft 10 once the element 30 is arranged in the bore 20.
- the second chamber 32 then has a bottom 33 in the shape of a half-disc extending perpendicular to the axis A so as to close, plug, or seal the hollow half-cylinder 35.
- the second chamber 32 comprises a hole or discharge orifice 34 for the fluid, for example circular, arranged opposite or at least partially opposite the second hole 22 once the distribution element 30 is inserted into the bore 20 of the shaft 10.
- the distribution element 30 of the first embodiment comprises a hollow half-cylinder shape 36.
- the hollow half-cylinder 36 extends into the first part 16 of the section 15 once the element 30 is arranged in the bore 20.
- the hollow half-cylinder 35 closed by the bottom 33 and the hollow half-cylinder 36 form a cylinder having a skin or external surface of diameter substantially equal to, preferably slightly smaller than, the diameter of the bore 20.
- the external surface of the two half-cylinders 35, 36 form the positioning element 39 facilitating the fixing of the distribution element 30 within the bore 20.
- the separation wall 37 extends on either side of the fictitious plane P separating the first part 16 from the second part 17 of the section 15, preferably being centered relative to the plane P.
- the separation wall 37 extends in the direction of the inlet 24 so as to divide the flow of fluid C arriving at the inlet into two flows C1, C2.
- the separation wall 37 does not extend to the level of the shoulder 38.
- the separation wall 37 stops at a distance L24 relative to the inlet 24, that is to say relative to the orifice of the bore 20 or relative to the shoulder 38.
- the distance L24 is equal to at least the internal diameter of the tubular part of the element 30 receiving the fluid, or even twice this internal diameter, so as to obtain a laminar flow instead of a turbulent flow.
- the axial end of the first chamber 31 corresponds to the non-opening end 23 of the bore 20.
- the end 23 is arranged at a defined distance D from the first hole 21.
- the defined distance D is twice the diameter of the first hole 21, or at least twice the diameter of the first hole 21.
- the axial end of the second chamber 32 is obtained by the bottom 33.
- the bottom 33 is preferably arranged at a defined distance D from the second hole 22.
- the defined distance D is twice the diameter of the second hole 22, or at least twice the diameter of the second hole 22.
- the bottom 33 is arranged, in the axial direction, after the second hole 22, that is to say between the non-opening end 23 and the second hole 22 so as to allow the fluid in the second chamber 32 to access the second hole 22.
- the distribution element is therefore a part comprising a cylindrical portion which allows the oil to be distributed uniformly over its internal surface by centrifugation at the inlet 24.
- the element 30 extends in the axial direction with the open semi-cylindrical part 36 which allows the oil to pass towards the bottom 23 of the central bore 20 of the rotor shaft.
- the element 30 extends in the axial direction with the semi-cylindrical chamber 32 comprising the radial oil discharge orifice 34 arranged opposite the second hole 22 made in the rotor shaft on the oil inlet side.
- the shoulder 38 makes it possible to ensure axial positioning of the distribution element 30 relative to the central bore 20.
- the contact between the shoulder 38 of the element 30 and a end or a shoulder of the central bore 20 of the shaft 10 makes it possible to ensure that the orifice 34 of the hollow half-cylinder 35 is at the level, along the axis A, of the second hole 22 made in the shaft.
- the distribution element 40 is also shaped so as to create, in the central bore, a first chamber 41 for supplying the first hole 21 and a second chamber 42 for supplying the second hole 22.
- the first and second chambers each communicate with the open end 24 of the central bore 20.
- the distribution element 40 comprises a positioning element 49 for positioning the distribution element 40 in the bore 20.
- the positioning element 49 is a cylindrical part of diameter equal, or substantially equal, to the diameter of the non-emerging end 23 of the bore 20.
- the distribution element 40 can be force-fitted and/or glued at the non-emerging end 23.
- the distribution element 40 comprises at least one separation wall 47 for the two fluid circuits.
- the separation wall 47 preferably extends substantially centered on the fictitious plane P separating the first part 16 from the second part 17 of the section 15.
- the separation wall 47 for example of the plate type, comes into contact, or substantially in contact, with the wall 25 of the bore 20.
- the separation wall has a clearance relative to the bore 20 so as not to hinder the assembly of the positioning element at the bottom 23 of the bore 20.
- the separation wall 47 comprises two edges 46 intended to come into contact, or substantially in contact, with the bore 20.
- the section perpendicular to the axis A of each edge 46 is curved so as to follow the circular section of the bore. central 20 opposite each edge. The curvature of each edge 46 then has an axis radius A of length just less than the radius of the bore 20 at this level.
- the distribution element 40 further comprises a half circular pellet 48.
- the half pellet or the half circular plate 48 extends radially from the separation wall 47.
- the half pellet 48 extends to the central bore 20, or substantially to the bore 20 so as not to hinder the assembly of the element 40 within the bore 20.
- the half pellet 48 extends into the second part 17 of the section 15. The half pellet 48 therefore creates an axial bottom, or substantially an axial bottom, for the second chamber 42.
- the distribution element 40 creates in the bore 20 the first chamber 41 within the first part 16 of the section 15 of the shaft 10 and the second chamber 42 within the second part 17 of the section 15 of the shaft 10.
- the first chamber 41 has a substantially half-cylinder shape extending from the disc or cylinder type positioning element 49 to one end 45 of the dividing wall 47 on the intake side.
- the wall or surface 25 of the bore 20 on the side of the first part 16 of the section helps to create the first chamber 41.
- the second chamber 42 also has a substantially half-cylinder shape extending from the half-pastille 48 to the end 45 of the dividing wall 47 on the intake side.
- the wall or surface 25 of the bore 20 on the side of the second part 17 of the section helps to create the second chamber 42.
- the separation wall 47 does not extend to the open end 24 of the shaft 10. In fact, the separation wall 47 stops at the distance L24 relative to the inlet 24, that is to say relative to the orifice of the bore 20. Thus, the flow C arriving at the inlet 24 is not divided upon arriving in the bore
- the distance L24 is equal to at least the diameter of the bore 20, or even twice this diameter, so as to obtain a laminar flow instead of turbulent.
- the half circular pellet 48 is arranged, positioned, in the direction of the axis A, between the first hole 21 and the second hole 22. In addition, the half circular pellet 48 is axially distant from the first hole.
- the axial end of the first chamber 41 is arranged at a defined distance D from the first hole 21.
- the defined distance D is twice the diameter of the first hole 21, or at least twice the diameter of the first hole 21.
- the axial end of the second chamber 42, created by the half-pellet 48 is arranged at a defined distance D from the second hole 22.
- the defined distance D is twice the diameter of the second hole 22, or at least twice the diameter of the second hole 22.
- the half-pellet 48 is arranged behind the second hole 22 in the direction of the non-opening end 23 of the bore.
- the positioning element 49 makes it possible to ensure axial positioning of the distribution element 40 relative to the central bore 20.
- the contact between the element 49 of the element 40 and the bottom of the end 23 of the central bore 20 of the shaft 10 makes it possible to ensure the axial positioning, that is to say along the axis A, of the distribution element 40 within the bore 20.
- the separation wall comprises two edges coming into contact with the central bore of the shaft and ensures positioning with respect to the bore so that the distribution element can be devoid of a cylindrical pellet-type positioning element.
- the end 23 of the bore comes into contact with the separation wall which ensures the bottom of the first chamber.
- the distribution element is devoid of half-pad 48.
- the distribution element only comprises a separation plate 47 capable of being positioned centered on the plane P and coming into contact with the end 23 of the bore 20.
- the sealing for the oil flow C on the intake side 24 between a fixed casing and the rotating shaft end 20 is obtained via radial grooves provided on the shaft and a smooth surface of a bore in the casing.
- the fluid preferably oil, creates fluid “seals” in the grooves like O-rings. This eliminates the need for lip seals which generate friction and reduce the efficiency of the electric motor.
- the flow distribution element 30; 40 is obtained from plastic material, such material being resistant for example up to 200 degrees C.
- the distribution element is obtained from metallic material, for example by sintering.
- the oil flow C preferably coming from a pump, in particular a pump dedicated to the lubrication of the gearbox if necessary, is admitted at the level of the inlet 24, that is to say at the open end of the shaft 10.
- the oil flow C preferably comes from a fixed casing and passes at the level of the inlet 24 in the shaft 20 which rotates, in particular at high speed.
- the oil flow first travels a distance L24 (either within a tubular part of the distribution element 30 of the first embodiment, or directly within the bore 20 in the second embodiment).
- the distance L24 makes it possible to attenuate any turbulence in the flow of oil linked to the passage from a fixed part, the casing, to a rotating part, the shaft 10.
- the oil flows, or flows substantially in laminar flow, at least turbulent or not turbulent.
- the separation wall 37; 47 is placed at this level so as to divide the oil flow C into two flows C1, C2.
- the flow C1 joins the first chamber 31; 41 and the flow C2 joins the second chamber 32; 42.
- one hole may have a larger cross-section than the cross-section of the other hole, for example if more cooling is required on one side of the rotor and/or stator.
- the cross-section of the distribution element may make it possible to make the cross-sections of the first and second chambers unequal.
- the geometry of the distribution element may be adapted, modified, to calibrate each flow C1, C2, for example 70 percent at the bottom (flow C1) and 30 percent at the inlet (flow C2), or vice versa.
- several first holes are arranged in the first part 16 of the section 15 from the bore 20 and/or several second holes (radial or not) are arranged in the second part 17 of the section 15 from the bore 20.
- as many corresponding orifices 34 are provided in the second chamber 32 so as to be opposite the second holes.
- an angular positioning means (not shown) is provided within the central bore and/or on the distribution element so as to angularly orient, around the axis A, the distribution element relative to the bore.
- an angular positioning means (not shown) is provided within the central bore and/or on the distribution element so as to angularly orient, around the axis A, the distribution element relative to the bore.
- an axial groove is provided within the bore and a projection, possibly of the lug type, extends radially outwardly from the distribution element.
- a projection possibly of the lug type, extends radially outwardly from the distribution element.
- one of the hollow half-cylinders 35, 36 comprises the projection.
- the positioning element 49 comprises the angular positioning projection
- at least one edge 46 of the partition wall 47 comprises the positioning projection
- the circular half-pad 48 comprises the positioning projection.
- each hole in the shaft should be arranged with the corresponding chamber, possibly with an orifice of a corresponding chamber in the distribution element.
- a position-holding means for example welding and/or a press-fit and/or glue, is provided to angularly hold the distribution element within the bore.
- the position-holding means can act as an angular positioning means, which simplifies the manufacture of the shaft and/or the distribution element.
- the oil flows through the holes 21, 22 and is therefore projected on each side of the rotor 3 and the stator 4 by centrifugal force.
- the diffusion of this oil on either side of the rotor, and/or stacks of the rotor, and/or the stator, contributes to effectively cooling the electric motor 2.
- the rotor can rotate at a speed of the order of 16,000 revolutions per minute.
- the electric motor does not reach the limit temperature of around 140 degrees C.
- the magnets retain their magnetic properties, are not altered, and the motor operates perfectly.
- the solution preferably aims to create two equal flows on either side of the rotor/stator assembly so as to cool both sides equally. This prevents one side from being less cooled and the magnets arranged at this level from creating malfunctions of the electric motor.
- the solution is compatible for an electric motor integrated into a gearbox.
- the gearbox has a temperature of the order of 100 degrees C for example, cooling via the holes allows each side face of the electric motor to be kept below the critical temperature, for example of the order of 140 degrees C.
- the solution consists in placing a physical element in the center of the rotor shaft to separate the oil flow arriving in the shaft, and its centrifugation into two separate flows.
- a single hole, for example radial is provided in the rotor shaft through which a first half of the flow is directed towards the outside of the shaft, and one or more holes at the other end of the shaft to direct the second half of the oil flow to the other side of the rotor.
- the invention relates to a separator of the oil flow into two flows for cooling an electric motor.
- the oil inlet is arranged on only one side of the shaft, the oil diffusion hole closest to the inlet does not offer a higher flow rate than the hole furthest from the inlet.
- the solution makes it possible to obtain oil flow rates passing through the holes independent of the rotation speed.
- the solution therefore makes it possible to cool the electric motor with oil injected into the bore 20 of the shaft 10 of the rotor 3.
- the oil is introduced into the intake 24 at the bore 20, i.e. at the center of the rotor, the oil is projected by centrifugation towards the inside of the stator 4, which makes it possible to draw calories from the hot parts, in particular the rotor and the stator.
- the solution is suitable for cooling the heat flow produced by the symmetrical losses of the electric motor.
- the solution allows, if desired, a distribution of the oil flow arriving in the bore into two equal flow rates so as to optimize cooling over the entire range of engine rotation speeds.
- Drill or machine holes of larger diameter is advantageous because it is easier and therefore less expensive, which helps to save money.
- flow distribution or separator element may be suitable for creating two separate chambers within the central bore such that each chamber supplies oil to at least one hole provided on the inlet side and at least one other hole provided at the other end of the shaft.
- the solution is suitable for cooling any electric motor equipped with an oil intake.
- the solution is particularly suitable for cooling an electric motor arranged, at least in part, within a gearbox, particularly in a vehicle. Indeed, although the gearbox reaches a temperature of around 100 degrees C for example, the cooling resulting from the solution makes it possible to cool the electric motor whose rotation can be very high so as to prevent the electric motor from reaching a critical temperature of around 140 degrees C. As a reminder, such a temperature causes losses of magnetic properties of the magnets which generates malfunctions of the electric motor.
- the solution therefore provides efficient cooling for the electric motor, compatible with its installation within a gearbox.
- the distribution element is easy to manufacture and integrate within the shaft in which a bore has been machined, for example.
- the solution therefore makes it possible to obtain an electric motor rotor providing cooling at each end of the rotor, for example with two equitable or even equal oil flows.
- the solution therefore achieves the desired objective of obtaining an electric motor rotor comprising a shaft which provides cooling of the motor, compatible with the high speed of the rotor and ensuring a cooling at each end of the rotor although the cooling fluid intake is only at one end of the rotor, and has the advantage of being able to be adapted to all types of electric motors benefiting from a fluid intake for its lubrication and/or cooling.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Mechanical Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP24728610.7A EP4725100A1 (fr) | 2023-06-06 | 2024-05-22 | Elément de répartition de flux au sein d'un arbre creux |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2305651A FR3149738B1 (fr) | 2023-06-06 | 2023-06-06 | Elément de répartition de flux au sein d’un arbre creux. |
| FRFR2305651 | 2023-06-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024251524A1 true WO2024251524A1 (fr) | 2024-12-12 |
Family
ID=88147016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2024/064145 Ceased WO2024251524A1 (fr) | 2023-06-06 | 2024-05-22 | Elément de répartition de flux au sein d'un arbre creux |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4725100A1 (fr) |
| FR (1) | FR3149738B1 (fr) |
| WO (1) | WO2024251524A1 (fr) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017006807A1 (de) * | 2017-07-18 | 2018-01-25 | Daimler Ag | Antriebseinrichtung für ein Kraftfahrzeug, insbesondere für einen Kraftwagen |
| US20200259398A1 (en) * | 2019-02-13 | 2020-08-13 | Hamilton Sundstrand Corporation | Dual fluid rotating shaft |
| CN113206563A (zh) * | 2021-04-21 | 2021-08-03 | 浙江零跑科技有限公司 | 一种油冷电驱动力转子结构 |
-
2023
- 2023-06-06 FR FR2305651A patent/FR3149738B1/fr active Active
-
2024
- 2024-05-22 WO PCT/EP2024/064145 patent/WO2024251524A1/fr not_active Ceased
- 2024-05-22 EP EP24728610.7A patent/EP4725100A1/fr active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017006807A1 (de) * | 2017-07-18 | 2018-01-25 | Daimler Ag | Antriebseinrichtung für ein Kraftfahrzeug, insbesondere für einen Kraftwagen |
| US20200259398A1 (en) * | 2019-02-13 | 2020-08-13 | Hamilton Sundstrand Corporation | Dual fluid rotating shaft |
| CN113206563A (zh) * | 2021-04-21 | 2021-08-03 | 浙江零跑科技有限公司 | 一种油冷电驱动力转子结构 |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3149738A1 (fr) | 2024-12-13 |
| EP4725100A1 (fr) | 2026-04-15 |
| FR3149738B1 (fr) | 2025-11-07 |
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