Casing for a reduction gear of a rotary electric machine

Abstract

The invention relates to a casing (1) for a reduction gear of a rotary electric machine, comprising an inner side wall (2) forming a cavity (3) for receiving a differential (13) of the reduction gear provided with a wheel (14), the cavity (3) having on its periphery a deflecting rib (4) guiding upwards the flow of a stream of lubricant sprayed by the wheel (14) of the differential (13) in operation, and a splitting rib (5) for splitting the stream of lubricant arranged after the deflecting rib (4) in the direction of flow of the stream of lubricant, the splitting rib (5) being configured to split the stream of lubricant into several streams (F1, F2, F3) each directed in different directions.

Description

[0001] Description

[0002] Title: Housing of a rotating electrical machine reducer

[0003] The present invention claims priority from French application 2304394 filed on May 2, 2023, 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 reducers for rotating electrical machines, more precisely the lubrication of reducers, and in particular the guidance of the lubricant inside them.

[0006] The machines may be synchronous or asynchronous, with alternating current. They may be traction or propulsion machines for electric motor vehicles (Battery Electric Vehicle) and / or hybrid vehicles (Hybrid Electric Vehicle - Plug-in Hybrid Electric Vehicle), such as individual cars, vans, trucks or buses. The invention also applies to rotating electrical machines for industrial and / or energy production applications, in particular naval, aeronautical or wind power.

[0007] Prior art

[0008] Lubrication of the elements of a reducer is a key issue for their proper functioning and reliability. It can be ensured by splashing the elements located in the lower part of the reducer into a lubricant and by the "rise" of the lubricant in the upper part of the reducer thanks to the rotation of the various rotating elements. The lubricant then trickles down and is projected by the rotational movements onto the walls of the reducer housing, contributing to the lubrication of all its elements. Lubrication by "splash", although particularly effective, nevertheless requires a large volume of lubricant, which, through a significant no-load drag phenomenon, reduces the efficiency of the reducer. To minimize these losses, systems for recovering and guiding the lubricant within the reducers, seeking to ensure good lubrication of the elements using a reduced volume of lubricant, have been proposed.

[0009] FR 3 059 753 thus discloses a deflector mounted in a reducer housing and having a V-shaped opening for recovering a lubricant and an area for facilitating the rise of the lubricant by rotational drive. US 2020 / 0132183 describes a guide plate mounted inside a reducer housing, the guide plate comprising ribs for guiding a lubricant.

[0010] US 2019 / 0173359 discloses a reduction gear housing with a lubricant reservoir, a passage for allowing the flow of lubricant to a shaft and a wall for diverting the flow of lubricant projected by the differential gear to the reservoir.

[0011] JP 2019 / 132411 discloses a cover for a gear of a differential provided with a plurality of alternating grooves and ribs ensuring better distribution of the lubricant.

[0012] US 2022 / 0286011 describes a groove in a gear housing extending between a lubrication trough and the axis of rotation of an intermediate shaft, to improve the delivery of a lubricant.

[0013] FR 3 094 438 discloses a reducer casing having an inner wall along which the projected oil flows and a rib collecting the oil flowing along the wall to guide it towards rotating parts ensuring its projection upwards.

[0014] There is a need to facilitate the rise of a lubricant towards the upper part of a reducer casing, and to ensure efficient distribution of the lubricant towards specific elements thereof.

[0015] Statement 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 gearbox housing for a rotating electrical machine, comprising an inner side wall providing a cavity for receiving a differential of the gearbox provided with a wheel, the cavity having on its periphery a deflecting rib guiding upwards the flow of a flow of lubricant projected by the wheel of the differential in operation, and a rib for dividing the flow of lubricant arranged after the deflecting rib in the direction of flow of the flow of lubricant, the dividing rib being configured to divide the flow of lubricant into several flows each directed in different directions.

[0017] A reducer may comprise a primary input shaft, an output shaft, a transmission stage, possibly a lubrication trough and a housing in which the shafts, the transmission stage and the trough are housed. The transmission stage may comprise at least one secondary shaft, so that a transmission of movement takes place between the input shaft and the output shaft. The secondary shaft may rotate a toothed output wheel which drives a differential.

[0018] The reducer housing may have side walls.

[0019] A "cavity" means a hollow space for containing a differential of the reducer, the cavity extending deep into the side wall. The cavity may have a generally circular shape, particularly in cross-section perpendicular to an axis of rotation X.

[0020] The reducer housing may contain the lubricant necessary for lubricating the reducer elements during operation.

[0021] The lubricant may be a fluid lubricant, for example a liquid. Preferably, it is an oil, for example a gearbox oil.

[0022] The reducer can be lubricated by “splash” lubrication.

[0023] The reducer can be lubricated by spraying a lubricant upwards by rotation of various elements within the reducer, in particular by rotation of the gear wheel of the reducer differential.

[0024] Summary of the invention

[0025] By "deflector rib" is meant a projecting portion in the cavity, configured to guide the flow of lubricant projected by the differential wheel, in particular by defining an area where the lubricant can flow along the wall of the cavity.

[0026] Due to the angle of the differential wheel teeth, lubricant may tend to flow downward or sideways before reaching the top of the gearbox, where there may be a lubrication chute to collect it. The deflector rib helps to direct as much lubricant as possible to the top of the gearbox by guiding the flow of lubricant and keeping it at the differential wheel, preventing it from flowing down the cavity.

[0027] The deflecting rib may extend in a plane transverse to an axis of rotation X of the output shaft. This transverse plane is vertical, extending along a vertical axis Z perpendicular to the axis of rotation X. The deflecting rib may extend inside the cavity, in particular circumferentially.

[0028] The deflecting rib may be arranged in the periphery of the cavity at a distance L from the cavity opening along an axis parallel to the axis of rotation X. The distance L may be chosen so that the deflecting rib is positioned inside the cavity behind the differential wheel. The width L may be between 2 and 5 cm, better between 3 and 4 cm, for example of the order of 3.6 cm.

[0029] The deflector rib can be positioned at a distance d from the differential wheel, between 2 and 6 mm, better between 2.5 and 5 mm, for example around 3.2 mm. This distance d allows a sufficiently large quantity of lubricant to be brought up along the deflector rib.

[0030] The deflector rib may have two ends, one located at a low point of the cavity and the other at a high point. The low point may be lower than the high point along the vertical Z axis. The low point may be the lowest point of the cavity, or alternatively be different from the lowest point of the cavity. The high point may be the highest point of the cavity, or alternatively be different from the highest point of the cavity.

[0031] The deflecting rib may have a thickness ei of between 3 and 20 mm, better still between 4 and 15 mm, better still between 5 and 10 mm, for example of the order of 7 mm, the thickness being measured along an axis parallel to the axis of rotation X, as for the distance L.

[0032] The deflecting rib may have a depth pi of between 5 and 20 mm, better between 6 and 15 mm, for example of the order of 7 mm, the depth being measured radially in the plane transverse to the axis of rotation X, transverse plane in which the deflecting rib generally lies.

[0033] A section of the deflecting rib in a plane radial to the axis of rotation X and perpendicular to the plane containing the deflecting rib, may have a generally rounded shape. Alternatively, it may have another shape, for example square or rectangular.

[0034] The deflector rib can be formed integrally with the inner wall of the reducer housing.

[0035] By "fractionating rib" is meant a projecting portion configured to separate the flow of lubricant conducted by the deflecting rib towards the top of the cavity, into several flows directed in different directions. The flows may each be directed towards different elements of the reducer, in particular towards a lubrication chute, among others.

[0036] The fractionating rib may be located after the deflector rib at the end of the upward guidance of the lubricant flow provided by the deflector rib. The fractionating rib may be arranged near an upper end of the deflector rib.

[0037] The fractionating rib may generally extend in a radial plane. It may have the form of a veil of material extending along this plane.

[0038] The deflecting rib may extend circumferentially in the form of an arc of a circle from a low point of the cavity to the splitting rib located at a high point of the cavity.

[0039] The splitting rib can be positioned at a point higher than the high point of the deflector rib, along the vertical Z axis.

[0040] The deflecting rib may be in the form of an arc, in particular an arc smaller than a semicircle. In a plane transverse to the axis of rotation X containing the deflecting rib, an angle 9 may be defined formed by the intersection of two radially extending straight lines contained in the transverse plane, each connecting one end of the deflecting rib to the axis of rotation X. The angle 9 may have a value between 5 and 175°, better still between 99 and 179°, even better still between 129 and 169°, for example of the order of 149°.

[0041] The splitting rib can be located at the highest point of the cavity.

[0042] The deflecting and splitting ribs may be arranged in the periphery of the cavity at the same distance L from the opening of the cavity and at the same distance d from the differential wheel measured on an axis parallel to the axis of rotation X of the output shaft of the reducer.

[0043] The splitting rib may extend in a radial plane relative to the X axis of rotation of the output shaft. This radial plane is vertical, extending along a vertical Z axis perpendicular to the X axis of rotation.

[0044] The splitting rib can thus have a face oriented transversely to the deflecting rib, so that the face of the splitting rib is opposite the upper end of the deflecting rib.

[0045] The fractioning rib may be formed in one piece with the inner wall of the reducer housing. The fractioning rib may have a thickness e2 of between 3 and 7 mm, better between 4 and 6 mm, for example of the order of 5 mm, the thickness being measured in the plane transverse to the axis of rotation X containing the deflecting rib along a horizontal axis Y perpendicular to the vertical axis Z.

[0046] Preferably, the splitting rib has the same thickness as the walls of the housing to facilitate the manufacture of the assembly.

[0047] The fractioning rib may have a depth p2 of between 1 and 4 cm, better between 2 and 3.5 cm, for example of the order of 2.7 cm, the thickness being measured along the axis of rotation X in the radial plane relative to the axis of rotation X containing the fractioning rib.

[0048] The splitting rib may have a protruding edge forming a right angle.

[0049] The splitting rib may have a substantially triangular shape. Alternatively, it may have another shape, such as, for example, a rectangular shape.

[0050] The fractioning rib may have a horizontal side and a vertical side. The horizontal and vertical sides together form said right angle. Thus, the two sides may meet at a right angle so that the fractioning rib, when viewed perpendicular to the radial plane containing the fractioning rib, may have a projecting edge forming a right angle.

[0051] The presence of a protruding edge forming a right angle makes it easier to break the flow of lubricant brought by the deflector rib and to cause the lubricant to drip.

[0052] The splitting rib and the deflecting rib may be spaced by a non-zero spacing es.

[0053] The spacing between the deflector and fractionator ribs makes it easier to divide the flow by creating an initial break in the flow which will strike the rib on its edges but also its entire face oriented transversely to the guidance of the deflector rib, thus increasing the impact surface.

[0054] The spacing es between the two ribs may be between 5 and 11 mm, preferably between 8 and 10 mm, measured circumferentially in the plane transverse to the axis of rotation X containing the deflecting rib. The splitting rib may be configured to divide the flow of lubricant into three flows: a first flow Fi, driven towards a lubrication chute located in the upper part of the reducer, a second flow F2, trickling towards the differential bearing, and a third flow F3, dripping towards the differential, in particular towards the differential housing and towards internal elements of the differential.

[0055] The first flow driven into the chute may have a greater flow rate than the other two flows.

[0056] The bell-shaped differential housing may have openings to allow lubricant to enter and thus lubricate the internal elements of the differential.

[0057] By "internal components" we mean gears contained within the differential housing.

[0058] A run-off rib may extend from the split rib toward the X axis of rotation of the output shaft.

[0059] By "flow rib" we mean a protruding part allowing to guide the flow of F2 lubricant towards the differential bearing.

[0060] The runoff rib can receive lubricant projected at high velocity and can receive lubricant from the F2 stream coming from the splitting rib.

[0061] The drip rib may be contiguous with the splitting rib. The drip rib may be radially aligned with the splitting rib in the cavity. The drip rib may extend in the same plane as the splitting rib.

[0062] The runoff rib may be located deeper in the cavity than the deflector and splitter ribs. The runoff rib may be arranged in the bottom of the cavity.

[0063] The flow rib may have a thickness of between 2 and 6 mm, better between 3 and 5 mm, for example of the order of 4 mm, the thickness being measured in the plane transverse to the axis of rotation X containing the deflecting rib along a horizontal axis Y perpendicular to the vertical axis Z.

[0064] The runoff rib may have a depth ps of between 5 and 20 mm, better between 7 and 15 mm, for example of the order of 14 mm, the depth being measured along the axis of rotation X in the radial plane relative to the axis of rotation X containing the splitting rib.

[0065] The flow rib can be formed in one piece with the inner wall of the reducer housing.

[0066] The splitting rib may have an adjacent cutout and / or the runoff rib may have an adjacent notch.

[0067] The split rib can be configured so that the second F2 stream of lubricant trickles over the cutout then over the trickle rib then over the notch and discharges at the differential bearing.

[0068] The cutout can recover the lubricant from the splitting rib and transmit the lubricant to the trickle rib.

[0069] The cutout may have a generally rounded bottom.

[0070] The cutout can be formed below the splitting rib.

[0071] The cutout may be arranged between the dividing rib and the runoff rib. It may be radially aligned with the runoff rib. It may also be radially aligned with the dividing rib.

[0072] The cutout may have a shoulder with a height hi of between 1 and 3 cm, preferably between 1.5 and 2.5 cm, for example of the order of 1.8 cm, measured along the axis of rotation X in the radial plane relative to the axis of rotation X containing the fractionating rib.

[0073] The notch can have a generally rounded shape.

[0074] The notch may be formed below the drip rib. The notch may be radially aligned with the drip rib and may extend toward the center of the cavity. The notch may open into a recess in the inner wall of the gear housing to discharge lubricant at the differential bearing.

[0075] The notch may have a shoulder with a height I12 of between 0.5 and 3 cm, preferably between 0.8 and 2 cm, for example of the order of 1 cm, measured along the axis of rotation X in the radial plane relative to the axis of rotation X containing the fractionating rib.

[0076] The notch and cutout increase the flow of lubricant to the rear of the bearing. The notch and cutout may have shoulders of the same height. Alternatively, they have shoulders of different heights.

[0077] The cavity may have a lubrication rib for a dynamic differential seal. The dynamic differential seal, which ensures the seal of the reducer at the transmission level, needs to be lubricated to avoid deterioration and thus increase its lifespan. The lubrication rib allows part of the flow arriving at the differential bearing to be recovered and brought deeper into the cavity at the dynamic differential seal, located after the differential bearing and thus away from the lubrication circuit.

[0078] The notch can collect the lubricant from the flow rib and transmit the lubricant to the differential bearing, to the front and rear of the bearing, and to the lubrication rib of the dynamic seal of the differential. At the differential bearing, the second flow F2 of the lubricant can thus split into three directions.

[0079] The lubrication rib may extend in the same plane as the splitting rib and / or the runoff rib.

[0080] The lubrication rib may be oriented perpendicular to the splitting rib and / or the runoff rib.

[0081] The lubrication rib can be formed in one piece with the inner wall of the reducer housing.

[0082] The lubrication rib can extend from the differential bearing to the dynamic seal.

[0083] The lubrication rib may have a thickness e4 of between 1 and 10 mm, preferably between 3 and 5 mm, for example of the order of 4 mm, the thickness being measured in a plane parallel to the plane transverse to the axis of rotation X containing the deflecting rib along a horizontal axis Y perpendicular to the vertical axis Z.

[0084] The lubrication rib may have a depth p4 of between 1 and 10 mm, preferably between 3 and 7 mm, for example of the order of 4 mm, the depth being measured along the vertical axis Z in a plane parallel to the radial plane relative to the axis of rotation X containing the fractionation rib. The depth and thickness of the lubrication rib may be sufficiently large to ensure the routing of the lubricant to the dynamic seal.

[0085] The invention also relates to a reducer for a motor vehicle comprising a casing as described above.

[0086] The reducer according to the invention may comprise a single transmission stage. Alternatively, it may comprise several transmission stages, for example two or three.

[0087] The invention also relates to a propulsion device for a motor vehicle, comprising a reducer as described above and a rotating electrical machine.

[0088] The invention also relates to a motor vehicle comprising a device as described above. The vehicle may comprise at least two drive wheels, each of the drive wheels being rotated by the reducer, in particular by an output shaft thereof.

[0089] The drive wheels may be arranged on either side of the reducer. Each drive wheel may comprise a shaft connected to an output shaft of the reducer. The device may comprise a first drive wheel rotatably connected to a first output shaft of the reducer. The device may comprise a second drive wheel rotatably connected to a second output shaft of the reducer.

[0090] Brief description of the drawings

[0091] The invention will be better understood by reading the detailed description which follows, non-limiting examples of its embodiment, and by examining the attached drawing.

[0092] [Fig 1] Figure 1 is a schematic and partial perspective view of a reducer housing according to the invention.

[0093] [Fig 2] Figure 2 is another perspective view of the housing of Figure 1.

[0094] [Fig 3] Figure 3 is another partial perspective view of the housing of Figure 1.

[0095] [Fig 4] Figure 4 is a partial front view of the housing of Figure 1.

[0096] [Fig 5] Figure 5 is a sectional view of the housing of Figure 1.

[0097] [Fig 6] Figure 6 is another partial perspective view of the housing of the figure

[0098] 1. Detailed description

[0099] Figures 1 to 6 illustrate a reducer casing 1 comprising an inner side wall 2 providing a receiving cavity 3 for a reducer differential 13, which is provided with a wheel 14.

[0100] The cavity 3 has on its periphery a deflecting rib 4 guiding upwards the flow of a stream of lubricant projected by the wheel 14 of the differential 13 in operation.

[0101] The deflecting rib 4 extends in a plane transverse to an axis of rotation X of the output shaft. This transverse plane is vertical, extending along a vertical axis Z perpendicular to the axis of rotation X.

[0102] The deflecting rib 4 extends inside the cavity 3.

[0103] The deflecting rib 4 is arranged in the periphery of the cavity 3 at a distance L, as illustrated in Figures 2 and 5, from the opening of the cavity along an axis parallel to the axis of rotation X. The distance L is 3.6 cm so that the deflecting rib 4 is positioned inside the cavity 3 behind the wheel 14 of the differential 13.

[0104] The distance d between the deflecting rib 4 and the wheel 14 of the differential is of the order of 3.2 mm, as visible in figure 5.

[0105] The deflecting rib 4 has two ends, a lower end 11 located at a low point of the cavity and a higher end 18 at a high point. The lower point is lower than the high point along the vertical axis Z.

[0106] The deflecting rib 4 has a thickness ei of 7 mm, measured along the same axis parallel to the rotation axis X as the distance L, as visible in Figure 3.

[0107] The deflecting rib 4 has a depth pi of 7 mm, measured radially in the plane transverse to the axis of rotation X containing the deflecting rib.

[0108] A section of the deflecting rib 4 in a plane radial to the axis of rotation X and perpendicular to the plane containing the deflecting rib has a generally rounded shape.

[0109] The deflecting rib 4 is formed in one piece with the inner wall 2 of the casing 1 of the reducer.

[0110] The cavity 3 also has a rib 5 for dividing the lubricant flow arranged after the deflecting rib 4 in the direction of flow of the lubricant flow which goes from the lower end 11 to the upper end 15 of the deflecting rib 4. The dividing rib 5 is configured to divide the lubricant flow into several flows F1, F2 and F3, each directed in different directions, illustrated in FIGS. 1 and 5.

[0111] The fractioning rib 5 is located after the deflecting rib 4 at the end of the upward guidance of the flow of lubricant provided by the deflecting rib 4. The fractioning rib 5 is arranged near an upper end 18 of the deflecting rib 4.

[0112] The deflecting rib 4 extends circumferentially in the form of an arc of a circle, smaller than a semicircle, from a low point of the cavity, towards the fractioning rib 5 located at the highest point of the cavity, higher than the high point of the deflecting rib, along the vertical axis Z.

[0113] In a plane transverse to the axis of rotation X containing the deflecting rib 4, an angle 9 can be defined formed by the intersection of two radially extending straight lines contained in the transverse plane, each connecting one end 18, 11 of the deflecting rib 4 to the axis of rotation X, as illustrated in Figure 2. The angle 9 has a value of 149° in this example.

[0114] The deflecting ribs 4 and fractioning ribs 5 are arranged in the periphery of the cavity 3 at the same distance L from the opening of the cavity measured on an axis parallel to the axis of rotation X of the output shaft of the reducer.

[0115] The splitting rib 5 extends in a radial plane relative to the axis of rotation X of the output shaft. This radial plane is vertical, extending along a vertical axis Z perpendicular to the axis of rotation X.

[0116] The splitting rib thus has a face 17 (visible in figure 1) oriented transversely to the deflecting rib 4, so that the face 17 of the splitting rib 5 is opposite the upper end 18 of the deflecting rib.

[0117] The splitting rib 5 is formed in one piece with the inner wall 2 of the casing 1 of the reducer.

[0118] The fractioning rib 5 has a thickness e2 of 5 mm, measured in the plane transverse to the axis of rotation X containing the deflecting rib 4 along a horizontal axis Y perpendicular to the vertical axis Z, as illustrated in Figure 4. The fractioning rib 5 has a depth p2 of 27 mm, measured along the axis of rotation X in the radial plane relative to the axis of rotation X containing the fractioning rib.

[0119] The splitting rib 5 has a projecting edge 10 forming a right angle.

[0120] The splitting rib 5 has a substantially triangular shape

[0121] The dividing rib 5 has a horizontal side 15 and a vertical side 16. The horizontal sides 15 and vertical sides 16 together form said right angle.

[0122] The fractionating rib 5 and the deflecting rib 4 are spaced apart by a non-zero spacing es of 9.5 mm measured circumferentially in the plane transverse to the axis of rotation X containing the deflecting rib.

[0123] A run-off rib 7 extends from the splitting rib 5 towards the axis of rotation X of the output shaft.

[0124] The drip rib 7 is contiguous with the splitting rib 5. The drip rib 7 is radially aligned with the splitting rib 5 in the cavity 3. The drip rib 7 extends in the same plane as the splitting rib 5.

[0125] The flow rib 7 is located deeper in the cavity 3 than the deflector rib 4 and the fractionation rib 5. The flow rib 7 is arranged in the bottom of the cavity 3.

[0126] The flow rib 7 has a thickness es of 4 mm, measured in the plane transverse to the axis of rotation X containing the deflecting rib along a horizontal axis Y perpendicular to the vertical axis Z, as visible in Figure 4.

[0127] The runoff rib 7 has a depth ps of 14 mm, measured along the rotation axis X in the radial plane relative to the rotation axis X containing the splitting rib, as shown in Figure 3.

[0128] The flow rib 7 is formed in one piece with the inner wall 2 of the casing 1 of the reducer.

[0129] The splitting rib 5 has an adjacent cutout 6 and the runoff rib 7 has an adjacent notch 8.

[0130] Cutout 6 has a generally rounded bottom.

[0131] The cutout 6 is formed below the splitting rib 5. The cutout 6 is arranged between the splitting rib 5 and the runoff rib 7. It is radially aligned with the runoff rib 7. It is also radially aligned with the splitting rib 5.

[0132] The cutout 6 has a shoulder with a height hi of 18 mm, measured along the axis of rotation X in the radial plane relative to the axis of rotation X containing the fractionating rib 5.

[0133] Notch 8 has a generally rounded shape.

[0134] The notch 8 is formed below the flow rib 7. The notch 8 is radially aligned with the flow rib and extends towards the center of the cavity. The notch 8 opens into a recess in the inner wall 2 of the casing

[0135] 1 of the reducer to pour the lubricant at the level of the bearing 12 of the differential 13.

[0136] The notch 8 has a shoulder with a height I12 of 10 mm, measured along the axis of rotation X in the radial plane relative to the axis of rotation X containing the fractionating rib 5.

[0137] The cavity 3 has a lubrication rib 19, shown in figure 6, of a dynamic seal 20 of the differential 13 visible in figure 5.

[0138] The lubrication rib 19 extends from the bearing 12 of the differential 13 to the dynamic seal.

[0139] The lubrication rib 19 extends in the same plane as the splitting rib 5 and the runoff rib 7.

[0140] The lubrication rib 19 is oriented perpendicular to the splitting rib 5 and the runoff rib 7.

[0141] The lubricating rib 19 is formed in one piece with the inner wall

[0142] 2 of the reducer housing 1.

[0143] The lubrication rib 19 has a thickness e4 of 4 mm, measured in a plane parallel to the plane transverse to the axis of rotation X containing the deflecting rib along a horizontal axis Y perpendicular to the vertical axis Z, as visible in figure 6.

[0144] The lubrication rib 19 has a depth p4 of 4 mm, measured along the vertical axis Z in a plane parallel to the radial plane relative to the axis of rotation X containing the fractionation rib.

[0145] The dividing rib 5 is configured to divide the flow of lubricant into three flows: a first flow Fi, shown in Figure 1, driven towards a lubrication chute 9 located in the upper part of the reducer, a second flow F2, shown in Figure 5, flowing over the cutout 6 then over the flow rib 7 then over the notch 8 and discharging at the level of the bearing 12 of the differential 13, and a third flow F3, shown in Figure 5, dripping towards the differential 13, in particular towards the differential housing and towards internal elements of the differential.

[0146] At the level of the bearing 12 of the differential 13, the flow F2 of the lubricant splits into three directions: in front and behind the bearing 12 and towards the lubrication rib 19 of the dynamic seal 20.

Claims

Claims 1. Housing (1) for a rotating electrical machine reducer, comprising an inner side wall (2) forming a cavity (3) for receiving a differential (13) of the reducer provided with a wheel (14), the cavity (3) having on its periphery a deflecting rib (4) guiding upwards the flow of a flow of lubricant projected by the wheel (14) of the differential (13) in operation, and a rib (5) for dividing the flow of lubricant arranged after the deflecting rib (4) in the direction of flow of the flow of lubricant, the dividing rib (5) being configured to divide the flow of lubricant into several flows (Fi, F2, F3) each directed in different directions.

2. Casing (1) according to the preceding claim, the deflecting rib (4) extending circumferentially in the form of an arc of a circle from a low point of the cavity towards the fractionating rib (5) located at an upper point of the cavity.

3. Housing (1) according to any one of the preceding claims, the fractionating rib (5) being located at the highest point of the cavity.

4. Housing (1) according to any one of the preceding claims, the deflecting (4) and fractionating (5) ribs being arranged in the periphery of the cavity (3) at the same distance (d) from the differential wheel measured on an axis parallel to the axis of rotation X of the output shaft of the reducer.

5. Housing (1) according to any one of the preceding claims, the fractioning rib (5) having a projecting edge (10) forming a right angle.

6. Housing (1) according to any one of the preceding claims, the fractioning rib (5) and the deflecting rib (4) being spaced apart by a non-zero spacing (es).

7. Housing (1) according to the preceding claim, the spacing (es) between the two ribs (4, 5) being between 5 and 11 mm, preferably between 8 and 10 mm.

8. Housing (1) according to any one of the preceding claims, a flow rib (7) extending from the splitting rib (5) towards the axis of rotation X of the output shaft.

9. Housing (1) according to any one of the preceding claims, the fractionation rib (5) having an adjacent cutout (6) and / or the runoff rib (7) having an adjacent notch (8).

10. Housing (1) according to any one of the preceding claims, the cavity (3) having a lubrication rib (19) of a dynamic seal (20) of the differential (13).

11. Housing (1) according to claims 8 and 9, the dividing rib (5) being configured to divide the flow of lubricant into three flows: a first flow (Fi) driven towards a lubrication chute (9) located in the upper part of the reducer, a second flow (F2) flowing over the cutout (6) then over the flow rib (7) then over the notch (8) and flowing at the level of the bearing (12) of the differential (13), and a third flow (F3), dripping towards the differential (13), in particular towards the differential housing and towards internal elements of the differential.

12. Housing (1) according to claims 10 and 11, the second flow (F2) splitting at the level of the bearing (12) of the differential (13) in three directions: at the front and at the rear of the bearing (12) and towards the lubrication rib (19) of the dynamic seal (20) of the differential (13).

13. Reducer for a motor vehicle comprising a casing (1) according to any one of the preceding claims.

14. Propulsion device for a motor vehicle, comprising a reducer (1) according to the preceding claim and a rotating electrical machine.

15. Motor vehicle comprising a device according to the preceding claim.

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