Housing of a motor vehicle propulsion device, including a fluid discharge manifold

Abstract

The invention relates to a housing (10) of a motor vehicle propulsion device intended to house a rotating electrical machine including at least one stator and at least one rotor. The housing (10) comprises a wall having an outer surface and an inner surface, the inner surface defining an inner cavity of the housing (10) receiving the rotating electrical machine. The outer surface includes a manifold (20) for discharging a cooling fluid. The manifold (20) includes a peripheral rib (22) defining a common fluid collection space, including at least one inlet (24) for fluid coming from the stator, at least one inlet (26) for fluid coming from the rotor, and a single fluid outlet (28). The manifold (20) further includes at least one inner rib (30, 32) extending into the common collection space, suitable for defining fluid circulation paths and for directing the fluid towards the single fluid outlet (28).

Description

[0001] Description

[0002] Title: Propulsion system housing for motor vehicles, including a fluid drain manifold

[0003] The present invention claims priority from French application 2503238 filed on March 28, 2025, the content of which (text, drawings and claims) is incorporated herein by reference.

[0004] technical field

[0005] The present invention relates to the field of fluid drainage manifolds for rotating electrical machines, and in particular to cooling fluid drainage manifolds. A cooling fluid is generally used to limit heat losses in the stator and rotor of the electrical machine, as well as in the gearbox.

[0006] The machines can be synchronous or asynchronous, and alternating current. They can be traction or propulsion machines for electric (Battery Electric Vehicle) and / or hybrid (Hybrid Electric Vehicle - Plug-in Hybrid Electric Vehicle) motor vehicles, such as passenger cars, vans, trucks, or buses. The invention also applies to rotating electrical machines for industrial and / or power generation applications, particularly in the marine, aeronautical, or wind power sectors.

[0007] Previous technique

[0008] Document FR 3 142630 Al describes a cooling and lubrication device for an electric powertrain, comprising two compartments, each with an oil recovery zone. Since the two compartments are not on the same level, the oil flow follows upward or downward paths, but does not circulate horizontally within a single compact collection zone.

[0009] US patent 20240333102 A1 discloses a cooling fluid supply system for a single-axle drive system in an electric vehicle, consisting of a set of three lines located at different elevations below the electric motor housing. The fluid is not centralized in a single compact collection area. EP patent 4407215 A1 discloses a vehicle drive system comprising a fluid line formed within the housings of the electric motor and gearbox. No fluid guides or fluid separation ribs are provided.

[0010] Document EP 4361 469 Al discloses a gearbox housing in which a coolant circuit is located beneath the gearbox. There is no coolant collection and drainage area.

[0011] Document FR 3 137733 Al discloses an oil recovery device for a gearbox comprising an electric motor. The oil recovery device consists of a simple settling tank located under the machine.

[0012] Document DE 102023 203763 Al discloses a compartment within the casing of an electric machine, in which a pump, filter, and heat exchanger can be installed. Oil is drawn from the gearbox side by the pump, then passes through the filter and the heat exchanger before returning to the machine's circuit. There are no guide ribs or oil circulation separators.

[0013] US patent 20240146155 Al discloses a low-friction electric motor with a lubricant reservoir located at the bottom of the gearbox. The lubricant and air are separated and injected into specific circuits within the rotor of the electric machine. There is no separate lubricant collection area.

[0014] There is a need to improve the evacuation of the cooling fluid in order to avoid mechanical losses by bubbling, while offering a compact system and avoiding air intake by the fluid evacuation pump which could damage this pump.

[0015] Summary of the invention

[0016] The invention aims to meet all or part of this need and achieves this, according to one of its aspects, by means of a propulsion device housing for a motor vehicle, intended to house a rotating electrical machine comprising at least one stator and at least one rotor,

[0017] the casing comprising a wall having an outer surface and an inner surface, the inner surface delimiting an internal cavity of the casing receiving the rotating electrical machine, the outer surface comprising a collector for the discharge of a cooling fluid, the collector comprising a peripheral rib delimiting a common space for the collection of this fluid,

[0018] the collector comprising at least one fluid inlet in the common collection space, adapted to collect fluid from the stator, at least one fluid inlet in the common collection space, adapted to collect fluid from the rotor and a single fluid outlet from the common collection space,

[0019] the collector further comprising at least one internal rib extending into the common collection space, at least one internal rib being adapted to delimit fluid circulations and to direct the fluid towards the single fluid outlet.

[0020] An electrical machine may have one or more stators. An electrical machine may have one or more rotors.

[0021] The coolant can be a liquid, including oil.

[0022] The collector, or collection area, or collecting zone, is also called an "oil tank".

[0023] The common fluid collection space is advantageously located in the lower part of the crankcase.

[0024] The peripheral rib extends vertically when the propulsion device is in its normal operating position.

[0025] At least one inner rib extends vertically when the propulsion device is in its normal operating position.

[0026] In a particular embodiment where the housing is also intended to house a gearbox, the manifold may further include at least one fluid inlet in the common collection space, adapted to collect fluid from the gearbox. Thus, the manifold according to the invention makes it possible to evacuate the cooling fluid flows from three sources (stator cooling channels, cooling fluid recovery zone at the rotor coil heads, and gearbox cooling fluid recovery zone) in parallel and simultaneously, while maintaining the compactness of the entire system.

[0027] The invention can be applied to a so-called "three-in-one" system comprising an electric machine, an inverter and a reducer, or to a so-called "two-in-one" system comprising an electric machine and a reducer, or even to a single electric machine.

[0028] The invention makes it possible to separate the flows of the cooling fluid arriving in the same collection zone constituted by the collector, these flows having flow velocities which can vary and which can be different from each other.

[0029] Indeed, the flow from the stator is under pressure and at high flow rate and therefore has a high speed, while the flows from the rotor and the reducer are at atmospheric pressure and at low flow rate and therefore have a lower speed.

[0030] According to the invention, the pressure of the flow from the stator helps to direct and guide the other flows towards the outlet and its action is combined with that of the ribs, which act as walls, allowing the flows to be separated and directed, in order to improve the evacuation of the fluid towards the outlet.

[0031] Thus, the ribs contribute to the proper flow of fluid from the recovery zones of the various flows and therefore prevent the undesirable accumulation of fluid which could cause mechanical losses related to bubbling and / or create an entry of fluid into the air gap.

[0032] In other words, the invention makes it possible, on the one hand, to reduce the overall pressure losses of the system and therefore to reduce the power of the pump required to reach a predetermined flow rate and on the other hand, to avoid an accumulation of fluid in the recovery areas of the different flows, in particular at the coil heads, which could cause an addition of fluid in the air gap reducing the efficiency of the electric machine.

[0033] In addition, the creation of a common collection zone for the different flows helps to preserve the compactness of the system and to avoid problems of air sloshing due to air suction during acceleration and braking, for example on slopes.

[0034] Description of the invention

[0035] The collector may include a closing plate, also called a cover, advantageously placed in the lower part of the collector, which allows the common fluid collection space to be closed.

[0036] The closing plate can be flat. This contributes to the overall compactness. The closing plate can also be horizontal. In this case, all fluid flows circulate horizontally within the common collection space, on the same level, i.e., without any rise or fall.

[0037] In a particular embodiment where the closing plate has an inner surface located in the common collection space, at least one inner rib may be arranged on the inner surface of the closing plate.

[0038] Alternatively, the inner surface of the closing plate can be smooth and at least one inner rib can be arranged on the outer surface of the housing.

[0039] The peripheral rib and at least one inner rib can be formed as a single piece with the housing.

[0040] The casing may include a sealing gasket positioned on the peripheral rib.

[0041] In a particular embodiment where at least one inner rib is located on the outer surface of the housing, a gap may be provided between the cover plate and at least one inner rib. This ensures a proper seal between the cover plate and the manifold, and also eliminates the need to adjust the cover plate for correct installation.

[0042] The single fluid outlet can be equipped with a single pump having a single inlet coinciding with the single fluid outlet of the manifold. Having a single pump with a single inlet and outlet reduces the pump power required to achieve a given flow rate, as the overall pressure losses in the system are reduced.

[0043] The manifold may have two fluid inlets adapted to collect fluid from the stator.

[0044] Similarly, to facilitate fluid evacuation, the collector may include two fluid inlets adapted to collect fluid from the rotor.

[0045] The fluid inlet adapted to collect fluid from the rotor that is furthest from the single fluid outlet of the collector may have an oblong shape, which further facilitates the evacuation of the fluid.

[0046] The fluid inlet designed to collect fluid from the rotor that is closest to the single fluid outlet of the collector may be circular. Advantageously, at least one inner rib partially surrounds at least one fluid inlet designed to collect fluid from the stator. This forces fluid circulation and protects the various inlets from other flows.

[0047] The casing may have two internal ribs.

[0048] A first inner rib may have an S shape. A second inner rib may have an L shape. The first and second inner ribs may delimit at least one passage configured to direct the fluid towards the single fluid outlet of the manifold.

[0049] The manifold may also include a filter located at the single fluid outlet of the manifold. The filter's purpose is to trap particles, particularly metallic ones, originating primarily from the gearbox. This prevents damage to the pump and avoids injecting metallic particles onto the coil heads.

[0050] The filter is advantageously located in front of the fluid inlet adapted to collect fluid from the reducer and fits into the single fluid outlet of the manifold.

[0051] Having the filter inside the collector makes maintenance easier. A simple opening allows for easy removal and replacement.

[0052] Alternatively, the filter can be placed downstream of the manifold, for example in the pump. This avoids obstructing the flow of fluid from the gearbox.

[0053] The pump's position differs from conventional solutions. In most prior art systems, a pump draws the coolant from the gearbox. The coolant is then pumped up through a water-oil heat exchanger before being reinjected into the machine. In contrast, according to this invention, the pump draws the coolant from the common collection space, resulting in a more compact design. This has the advantage of collecting the coolant from the gearbox outside of it. This eliminates the need for a pipe or tube inside the gearbox and allows for a very low level of coolant to be maintained within the gearbox.

[0054] The pump's rotation axis is advantageously positioned below the cooling fluid level of the electric machine. The invention also relates to a propulsion device for a motor vehicle, comprising a casing as defined above, a rotating electric machine, a reducer and an inverter.

[0055] The propulsion system for a motor vehicle may include one or two rotating electrical machines.

[0056] The gearbox may have a single transmission stage. Alternatively, it may have several transmission stages, for example two or three transmission stages.

[0057] The rotating electrical machine(s) can be arranged on either side of the gearbox. Each rotating electrical machine can have a shaft connected to a primary shaft of the gearbox.

[0058] The invention also relates to a motor vehicle comprising a propulsion device as described above. The vehicle may have at least two drive wheels, each of the drive wheels being driven in rotation by the reduction gear, in particular by an output shaft thereof.

[0059] The drive wheels can be arranged on either side of the gearbox. Each drive wheel can have a shaft connected to an output shaft of the gearbox. The device can include a first drive wheel fixed in rotation to a first output shaft of the gearbox. The device can include a second drive wheel fixed in rotation to a second output shaft of the gearbox.

[0060] Brief description of the drawings

[0061] The invention will be better understood upon reading the detailed description that follows, a non-limiting example of its embodiment, and an examination of the attached drawings.

[0062] [Fig 1] Figure 1 is a schematic and partial bottom view of a housing according to the invention, in a particular embodiment.

[0063] [Fig 2] Figure 2 is a schematic and partial perspective view of the housing in Figure 1.

[0064] [Fig 3] Figure 3 is a schematic and partial perspective view, from another angle, of the housing of Figure 1. [Fig 4] Figure 4 is an enlarged, schematic and partial view of part of a collector included in the housing of Figure 1.

[0065] [Fig 5] Figure 5 is a schematic and partial cross-sectional view of a housing according to the invention, highlighting the location of the coolant recovery areas and the inlets in a collector included in the housing, in a particular embodiment.

[0066] [Fig 6] Figure 6 is a schematic and partial cross-sectional view of a housing according to the invention, showing in particular the closing plate.

[0067] [Fig 7] Figure 7 is a schematic view of a simulation showing the circulation of the different cooling fluid flows in a collector included in a housing according to the invention, from the inlets of the collector and towards its outlet.

[0068] [Fig 8] Figure 8 is a schematic and partial bottom view of a housing according to the invention, in one embodiment.

[0069] Detailed description

[0070] Figures 1 to 8 illustrate a housing 10 of a propulsion device for a motor vehicle, in a particular embodiment of the invention. The propulsion device comprises a rotating electric machine and a gearbox, both arranged within the housing 10, as well as an inverter. The gearbox may include a primary shaft, a secondary shaft in a transmission stage, and an output shaft.

[0071] In the non-limiting example described here, the electric machine comprises a stator and a rotor.

[0072] As shown in Figures 1 and 5, the housing 10 comprises a wall 12 having an outer surface 14 and an inner surface 16. The inner surface 16 delimits an inner cavity 18 of the housing 10 which receives the rotating electrical machine and the reducer.

[0073] As shown in figures 1 to 8, the outer surface 14 has a collector 20 for draining a cooling fluid.

[0074] According to the invention, the manifold 20 has a peripheral rib 22 defining a common space for collecting the cooling fluid. The peripheral rib 22 extends vertically when the propulsion device is in its normal operating position. In the non-limiting example described here, the manifold 20 has two fluid inlets 24 in the common collection space, adapted to collect fluid from the stator, two fluid inlets 26 in the common collection space, adapted to collect fluid from the rotor, and one fluid inlet 34 in the common collection space, adapted to collect fluid from the gearbox. The fluid inlet 34 adapted to collect fluid from the gearbox extends in a plane orthogonal to the plane in which the other fluid inlets extend.

[0075] The two fluid inlets 24 in the common collection space, adapted to collect fluid from the stator, are in the form of an oblong opening, on the side of the coil heads, at the non-driving end (NDE). Such an oblong shape has the advantage of being simple to machine and avoids having edges, unlike a rectangular shape for example.

[0076] As shown in Figures 1 to 4 and 8, the two fluid inlets 26 in the common collection space are adapted to collect fluid from both sides of the rotor, namely, from the driving end (DE, in English "Driving End", on the gearbox side, at the top in Figures 1 and 8) and from the non-driving end (NDE, on the opposite side of the gearbox, at the bottom in Figures 1 and 8).

[0077] As shown in Figure 5, zone A is the fluid recovery zone from the rotor on the NDE side and does not extend higher than the air gap, zone B is the fluid recovery zone from the rotor on the DE side and does not extend higher than the air gap, reference C designates the circular ring-shaped fluid recovery zone from the stator and zone D is the fluid recovery zone from the reducer.

[0078] According to the invention, the collector 20 has a single fluid outlet 28 from the common collection space.

[0079] The single fluid outlet 28 (visible in figures 1 to 3 and 5 to 8) is equipped with a single pump (not shown) having a single inlet coinciding with the single fluid outlet 28 of the manifold 20.

[0080] In the non-limiting example described here, the collector 20 further comprises two internal ribs 30, 32 extending into the common collection space. These internal ribs 30, 32 are adapted to delimit fluid flows and direct the fluid towards the single fluid outlet 28. The internal ribs 30, 32 extend vertically when the propulsion device is in its normal operating position.

[0081] In the non-limiting example described here, the inner ribs 30, 32 are arranged on the outer surface 14 of the housing 10. The peripheral rib 22 and the inner ribs 30, 32 are formed as a single piece with the housing 10.

[0082] The first inner rib 30 has an S-shaped configuration so as to partially surround, on the one hand, within a first loop of the S, one of the two fluid inlets 24 adapted to collect fluid from the stator and on the other hand, within the second loop of the S, one of the two fluid inlets 26 adapted to collect fluid from the rotor, in this case the fluid inlet 26 which is closest to the single fluid outlet 28.

[0083] The second inner rib 32 has an L-shaped configuration designed to partially surround the other fluid inlet 24 adapted to collect fluid from the stator.

[0084] The inner ribs 30, 32 are arranged relative to each other so that one of the loops of the S of the first inner rib 30 and one of the branches of the L of the second inner rib 32 delimit a first passage PI of fluid between the two inner ribs 30, 32. A second passage P2 of fluid is further delimited by the opposite side of the same loop of the S of the first inner rib 30 and the peripheral rib 22, i.e. the edge of the collector 20.

[0085] Thus, the fluid from the stator is guided by the inner ribs 30 and 32 and by the edge of the collector 20, i.e., the peripheral rib 22, so as to pass perpendicularly to the fluid from the gearbox, in order to guide the latter towards the single fluid outlet 28 and thus improve its evacuation. The first and second passes PI and P2 further guide the fluid collected by the fluid inlet 26, which is adapted to collect fluid from the rotor and is the furthest from the single fluid outlet 28 (the fluid inlet 26 located at the bottom in Figures 1 and 8).

[0086] The thickness of the internal ribs 30, 32 can be between 1 mm and 6 mm, preferably between 2 mm and 5 mm. For example, it is around 4 mm.

[0087] The width of the first passage PI (i.e., the space between the two inner ribs 30, 32) can be between 5 mm and 40 mm, preferably between 6 mm and 20 mm, and even better between 7 mm and 15 mm. For example, it is on the order of 10 mm. The cross-sectional area of ​​the first passage PI of the fluid coming from the NDE inlet can be between 50 mm 2 and 300 mm 2 , ideally between 55 mm 2 and 200 mm 2 , even better between 60 mm 2 and 100 mm 2 For example, it is around 70 mm 2 .

[0088] The cross-sectional area of ​​the second passage P2 of the fluid coming from the NDE inlet can be between 200 mm 2 and 500 mm 2 (for a width of 25 mm), better between 225 mm 2 and 400 mm 2 (for a width of 20 mm), even better between 250 mm 2 and 300 mm 2 (for a width of 15 mm). For example, it is approximately 275 mm 2(for a width of 15 mm).

[0089] The second passage P2 is deeper than the first passage PI, because the housing 10 is rounded, so that the height of the collector 20 is greater at its ends than at its center where the first passage PL is located. Preferably, the cross-sectional area of ​​the second passage P2 is larger than the cross-sectional area of ​​the first passage PL. Thus, a greater quantity of fluid passes through the second passage P2 and a smaller quantity of fluid passes through the first passage PL. The first passage PI allows the excess fluid to be drained.

[0090] The ratio between the second pass section P2 and the first pass section PI can be between 20% and 50%, better between 20% and 40%, even better between 20% and 30%. For example, it is around 25%.

[0091] Other dimensions are identified in Figure 1, as follows.

[0092] The width L1 of the fluid passage from the stator depends on the dimensions of the first passage PI and the width of the collector 20. The width L1 can be between 40 mm and 275 mm, preferably between 50 mm and 180 mm, and even better between 60 mm and 85 mm. For example, it is on the order of 72 mm.

[0093] The width L2 of the fluid passage restriction from the stator depends on the dimensions of the first passage PI, the width of the manifold 20, and the diameter of the circular fluid inlet 26 on the DE side. This passage restriction directs the fluid from the stator to drive the fluid from the gearbox towards the single fluid outlet 28. The width L2 can be smaller than the width L1 to dictate the direction of the fluid flow. The width L2 can range from 10 to 100 mm, ideally from 20 to 50 mm, and even better from 25 to 40 mm. For example, it is typically around 30 mm. The ratio between the widths L1 and L2 can range from 20% to 60%, ideally from 30% to 50%. For example, it is typically around 40%.

[0094] The surface area of ​​the fluid inlet section 24, adapted to collect fluid from the stator, can be between 50 mm 2 and 200 mm 2 , ideally between 80 mm 2and 150 mm 2 even better between 90 mm 2 and 120 mm 2 For example, it is on the order of 100 mm 2 .

[0095] The cross-sectional area of ​​the circular fluid inlet 26, adapted to collect fluid from the rotor on the DE side, can be between 70 mm 2 and 500 mm 2 , ideally between 150 mm 2 and 400 mm 2 even better between 200 mm 2 and 300 mm 2 For example, it is approximately 255 mm 2 .

[0096] The surface area of ​​the oblong fluid inlet section 26, adapted to collect fluid from the rotor on the NDE side, can be between 100 mm 2 and 900 mm 2 , ideally between 300 mm 2 and 700 mm 2 even better between 400 mm 2 and 500 mm 2 For example, it is around 470 mm 2 .

[0097] The surface area of ​​the fluid inlet section 34, adapted to collect fluid from the reducer, can be between 80 mm 2 and 500 mm 2 , ideally between 150 mm 2 and 400 mm 2 even better between 200 mm 2 and 300 mm 2 For example, it is approximately 255 mm 2 .

[0098] The cross-sectional area of ​​the single fluid outlet 28 can be between 100 mm 2 and 1000 mm 2 , ideally between 300 mm 2 and 700 mm 2 even better between 500 mm 2 and 600 mm 2 For example, it is around 570 mm 2 .

[0099] The width L3 of the collector 20 can be between 80 mm and 300 mm, better between 85 mm and 200 mm, even better between 90 mm and 100 mm. It is for example around 92 mm.

[0100] The length L4 of the collector 20 can be between 200 mm and 350 mm, preferably between 250 mm and 300 mm. For example, it is around 286 mm.

[0101] As shown in Figures 5 and 6, the collector 20 also includes a closing plate 36 or cover, which closes the collector 20 from below.

[0102] The closing plate 36 can be made of metal, such as aluminium, or can be made of plastic.

[0103] In the non-limiting example described here, the closing plate 36 is flat. Furthermore, the inner surface of the closing plate 36, located in the common collection space, is smooth, the inner ribs 30, 32 being, as described above, arranged on the outer surface 14 of the housing 10.

[0104] The housing 10 also includes a sealing gasket 38 arranged around the entire circumference of the peripheral rib 22, in contact with the manifold 20 and the closing plate 36. The sealing gasket 38 is, for example, an O-ring.

[0105] The internal ribs 30 and 32 are slightly spaced from the closing plate 36, thus creating a gap that ensures proper contact between the closing plate 36 and therefore a good seal. This gap can be between 0 and 3 mm, preferably between 0.5 mm and 2 mm. For example, it is on the order of 1 mm.

[0106] Figure 7 shows a simulation of the flow from the different fluid inlets to the single fluid outlet 28. The fluid from the rotor on the NDE side is represented by right-slanted hatching, the fluid from the DE rotor is represented by vertical hatching, the fluid from the stator is represented by horizontal hatching, and the fluid from the reducer is represented by left-slanted hatching.

[0107] As shown in Figure 8, in the non-limiting example described here, the manifold 20 further includes a filter 40, located at the single fluid outlet 28 of the manifold 20. The optional filter 40 can be made of a plastic body with a metal mesh having filtration openings of approximately 200 pm, or of a finer non-woven paper.

[0108] Alternatively, the collector could be filterless.

Claims

Demands 1. Housing (10) for a motor vehicle propulsion device, intended to house a rotating electrical machine comprising at least one stator and at least one rotor, the housing (10) comprising a wall (12) having an outer surface (14) and an inner surface (16), the inner surface (16) defining an inner cavity (18) of the housing (10) receiving the rotating electrical machine, the outer surface (14) comprising a collector (20) for draining a cooling fluid, the collector (20) comprising a peripheral rib (22) delimiting a common space for collecting said fluid, the collector (20) comprising at least one fluid inlet (24) in the common collection space, adapted to collect fluid from the stator, at least one fluid inlet (26) in the common collection space, adapted to collect fluid from the rotor and a single fluid outlet (28) from the common collection space, the collector (20) further comprising at least one internal rib (30, 32) extending into the common collection space, the at least one internal rib (30, 32) being adapted to delimit fluid circulations and to direct the fluid towards the single fluid outlet (28).

2. Carter (10) according to claim 1, the collector (20) further comprising a closing plate (36).

3. Housing (10) according to claim 2, the closing plate (36) being flat.

4. Housing (10) according to claim 2 or 3, the closing plate (36) having an inner surface located in the common collection space, the inner surface of the closing plate (36) being smooth and at least one inner rib (30, 32) being disposed on the outer surface (14) of the housing (10).

5. Housing (10) according to any one of the preceding claims, the peripheral rib (22) and at least one inner rib (30, 32) being formed as one piece with the housing (10).

6. Housing (10) according to any one of claims 2 to 5, comprising a sealing gasket (38) disposed on the peripheral rib (22).

7. Housing (10) according to any one of claims 2 to 6, a gap being provided between the closing plate (36) and at least one inner rib (30, 32).

8. Carter (10) according to any one of the preceding claims, the single fluid outlet (28) being equipped with a single pump having a single inlet coinciding with the single fluid outlet (28) of the manifold (20).

9. Carter (10) according to any one of the preceding claims, the manifold (20) having two fluid inlets (24) adapted to collect fluid from the stator and two fluid inlets (26) adapted to collect fluid from the rotor.

10. Housing (10) according to any one of the preceding claims, at least one inner rib (30, 32) partially surrounding at least one fluid inlet (24) adapted to collect fluid from the stator.

11. Housing (10) according to any one of the preceding claims, at least one inner rib (30) partially surrounding at least one fluid inlet (26) adapted to collect fluid from the rotor.

12. Casing (10) according to any one of the preceding claims, comprising a first inner rib (30) having an S shape and a second inner rib (32) having an L shape, the first and second inner ribs (30, 32) delimiting at least one passage (P1, P2) configured to drive the fluid towards the single fluid outlet (28) of the manifold (20).

13. Housing (10) according to any one of the preceding claims, intended to further house a reducer, the manifold (20) further comprising at least one fluid inlet (34) in the common collection space, adapted to collect fluid from the reducer.

14. Carter (10) according to any one of the preceding claims, the manifold (20) further comprising a filter (40) disposed at the single fluid outlet (28) of the manifold (20).

15. Propulsion device for motor vehicle, comprising a casing (10) according to any one of the preceding claims, a rotating electric machine, a reducer and an inverter.

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