Lubricating chute for a reduction gear

Abstract

The invention relates to a lubricating chute (2) for a reduction gear (1) of a rotary electric machine, the chute (2) comprising a flow floor (9) having a bottom surface (10) and one or more discharge ports (25, 26, 27, 28) arranged in the flow floor (9), the bottom surface (10) being bordered by guide walls (11, 12) connecting to the flow floor (9) so as to form at least one passage (17, 18, 19) for circulating a lubricant towards the one or more discharge ports (25, 26, 27, 28), and comprising at least one discharge port (25, 26, 27, 28) which is surrounded by a raised rim (37).

Description

[0001] Description

[0002] Title: Lubrication chute of a reducer

[0003] The present invention claims priority from French application 2304389 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, and in particular the lubrication of these reducers for rotating electrical machines.

[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] Lubricating gearboxes in rotating electrical machines is essential for their proper functioning and reliability, in order to reduce friction and wear generated by the movements of the various elements within them. However, over the course of use of the machines, dust and other particles of various materials, such as aluminum, steel or plastic for example, can mix with the lubricant and damage the bearings and gears, among others, of the gearbox.

[0009] It is known from the prior art to install a chute comprising a lubricant guide making it possible to distribute the lubricant within the reducer as well as means for retaining at least part of the particles present in the lubricant circulating in the chute.

[0010] Patent application JP09210185 describes a transmission lubrication chute having a recessed cavity beneath its flow floor, the cavity allowing lubricant particles to be retained. The chute takes the form of a conduit open at its ends, the lubricant entering the chute and being distributed after passing through the chute to the transmission gears through the ends of the open conduit.

[0011] Application FR 3 109 619 teaches multiple conical-shaped cavities arranged in the thickness of the floor of a gearbox lubrication chute to allow the lubricant to drain while stopping unwanted particles. The chute provides several lubricant discharge channels above the gearbox gears and bearings.

[0012] Applications FR 3 082 264, FR 3 121 721, EP 2 199 645 and FR 3 109 619 in a second embodiment, disclose chutes comprising walls formed from magnetizable or magnetic materials, capable of attracting the magnetic particles transported by the lubricant. FR 3 082 264 and EP 2 199 645 respectively present lubrication chutes for a gearbox and a transmission, evacuating the lubricant towards pinions and bearings by means of discharge channels.

[0013] The magnetic walls mentioned above are effective in retaining magnetic particles carried by the lubricant. However, given the diverse nature of the particles, which can be made of plastic for example, many particles cannot be retained by these magnetic walls.

[0014] There is a need for a chute that can efficiently and precisely guide a lubricant to specific elements of a reducer of a rotating electrical machine, while retaining particles, both magnetic and non-magnetic, carried by the lubricant.

[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 lubrication chute for a reducer of a rotating electrical machine, the chute comprising a flow floor having a bottom surface and one or more discharge orifices provided in the flow floor, the bottom surface being bordered by guide walls attached to the flow floor, so as to form at least one corridor for circulation of a lubricant towards the discharge orifice(s), and at least one discharge orifice being surrounded by a raised rim. A reducer may comprise at least one primary shaft, an output shaft, a transmission stage, a lubrication chute and a casing in which the primary and secondary shafts, the transmission stage and the chute are housed.The transmission stage may comprise one or more secondary shafts, in particular one or two, so that a transmission of movement takes place between the primary shaft and the output shaft.

[0017] A "lubrication chute" means a chute into which a lubricant can flow. The chute is configured to direct and discharge the lubricant to at least one element of the reducer.

[0018] The reducer element can be chosen from: a bearing, a pinion, a gear, a cog, a primary shaft, a secondary shaft of a transmission stage or an output shaft, a casing, a seal, this list not being limiting.

[0019] The lubricant may be a fluid lubricant, for example a liquid. Preferably, it is an oil, in particular a gearbox oil.

[0020] The chute can be open upwards. It can be without a top wall.

[0021] The chute can provide an elongated circulation corridor in the form of a conduit.

[0022] The chute may extend along a straight axis. Alternatively, the chute may have an L shape.

[0023] A "drain floor" means a lower wall of the chute onto which the lubricant can flow.

[0024] "Guide walls" means side walls of the chute, in particular those that are longer than they are high. The chute may have two guide walls, one on the reducer side and one on the machine side.

[0025] The guide walls can have different heights. Alternatively, they have the same height.

[0026] The guide wall on the reducer side can have a height between 5 and 50 mm, better between 6 and 35 mm, better between 7 and 25 mm, for example 9 mm.

[0027] The guide wall on the machine side can have a height between 5 and 50 mm, better between 6 and 35 mm, better between 7 and 25 mm, for example 22 mm.

[0028] The term "bottom surface" of the flow floor means the inner face of the flow floor, which is bordered by the guide walls. The bottom surface is the upper surface of the flow floor. The term "circulation corridor" means a corridor, in particular of a width less than or equal to that of the chute, allowing the flow of the lubricant along at least part of the length of the chute. The guide walls bordering the bottom surface of the flow floor form a first circulation corridor within the chute.

[0029] A "drain hole" means a hole in the floor of the chute. This is an orifice through which lubricant can flow out of the chute and lubricate at least one element of the reducer located below the chute.

[0030] Choosing a discharge port instead of a discharge chute allows lubricant to be delivered more precisely to strategic parts of the gearbox that require lubrication. This improves lubrication accuracy and prevents lubricant loss.

[0031] A "rim" means a projection that borders the discharge opening.

[0032] By "raised rim" is meant that the projection is significantly raised upwards, in particular by at least 0.5 mm, relative to the bottom surface of the discharge floor. The raised rim of the orifices, greater than the maximum particle size, allows the flow of the majority of the lubricant through the discharge orifices by maintaining the particles by settling in a remainder of lubricant at the bottom of the chute, in particular heavy particles.

[0033] Statement of the invention

[0034] One of the guide walls may include centering pins. It may include rivets. The pins and / or rivets may be intended to cooperate with fixing holes provided in a gearbox housing, in order to allow the centering and fixing of the chute on the housing respectively.

[0035] One of the guide walls may include a flexible tab that can be wedged against an internal face of the gearbox housing. The tab may be elastic and deformable. The flexible tab may prevent the chute from moving in the gearbox. It may be a guide wall opposite the guide wall including centering pins and / or rivets. Preferably, the guide wall including the flexible tab does not include centering pins or rivets. The chute may further include one or more internal walls. The internal walls may have a height less than or equal to a height of the guide walls.

[0036] The inner wall(s) may be parallel to the guide walls. An inner wall and a guide wall may form a lubricant flow path between them. Two inner walls may form a lubricant flow path between them. In particular, the chute may comprise a single inner wall and two guide walls, so as to form two flow paths for the lubricant.

[0037] The traffic lanes can have the same width. Alternatively, they can have different widths.

[0038] The circulation lanes may extend the entire length of the chute. Alternatively, at least one of the circulation lanes extends only a portion of the length of the chute before joining another circulation lane.

[0039] The chute may have an inlet wall, which may be arranged transversely to the direction of flow of the lubricant in the chute. The inlet wall may be attached obliquely to the flow floor.

[0040] The inlet wall can be placed opposite an output wheel of the reducer, so as to recover inside the chute at least part, or even most, of the lubricant projected upwards by the output wheel.

[0041] The inlet wall may include a notch arranged opposite the outlet wheel to facilitate the entry of lubricant into the chute.

[0042] The chute may further have a closing wall, which may be arranged transversely to the direction of flow of the lubricant and placed at the end of the lubricant flow corridor formed by the guide walls and the bottom surface. This closing wall makes it possible to prevent the flow of the lubricant outside the chute and thus to keep it within the chute.

[0043] All chute walls can have the same thickness. Alternatively, the chute walls can have different thicknesses.

[0044] The discharge floor of the chute can be generally horizontal.

[0045] The floor may be composed of a first generally horizontal floor portion extending from the inlet wall to an intermediate point of the chute and a second oblique floor portion extending from this intermediate point to the closing wall, such that the closing wall is located higher than the inlet wall of the chute. Such an oblique portion of the floor allows the lubricant to flow back towards the first generally horizontal portion of the chute and facilitates its retention in the chute, as well as its exit through the discharge orifice(s).

[0046] The chute can be made of sheet metal. Alternatively, the chute can be made of injection-molded plastic.

[0047] The chute may have a plurality of discharge orifices which distribute the lubricant to different elements of the reducer. In particular, the chute may have at least one discharge orifice, or even at least two, in particular two discharge orifices, or even three, better still four.

[0048] The chute may have a primary discharge port, located above the primary shaft of the reducer, so as to distribute lubricant to it.

[0049] The chute may include a secondary discharge port, located above a secondary shaft of the transmission stage of the reducer, so as to distribute lubricant to it.

[0050] The chute may have an outlet discharge port, located above the output shaft of the reducer, so as to distribute lubricant to it.

[0051] The chute may include a gear discharge port, located above a gear of the transmission stage of the reducer, so as to distribute lubricant thereto.

[0052] In one embodiment, the chute may include at least one primary discharge port, one secondary discharge port, and one outlet discharge port provided in the drain floor, the discharge ports being surrounded by a raised rim.

[0053] The different discharge openings may have the same shape. Alternatively, the discharge openings may have different shapes. Each discharge opening may have a circular shape, or another shape, for example an elliptical shape or an oval shape.

[0054] In particular, the primary, intermediate and gear discharge ports can have a circular shape. They can have a diameter between 2 and 5 mm, better between 3 and 4 mm.

[0055] The primary discharge orifice can be a circle of diameter 4 mm.

[0056] The secondary discharge port can be a 3.5 mm diameter circle. The gear discharge port can be a 3 mm diameter circle.

[0057] The outlet discharge port may have an oval shape. It may have a larger dimension L in length between 3 and 5 mm, better between 4 and 5 mm. It may have a smaller dimension 1 in width between 2 and 3 mm.

[0058] The different discharge ports may have equal cross-sections. Alternatively, they may have different cross-sections. The different discharge ports may have different cross-sections to distribute the lubricant flow differently to the reducer elements.

[0059] In one embodiment, the primary discharge orifice may have a larger cross-section than the secondary discharge orifice. In particular, the primary and intermediate discharge orifices may have a circular shape and the primary discharge orifice may have a diameter at least 14% larger than the diameter of the secondary discharge orifice.

[0060] In one embodiment, the primary discharge port may have a larger cross-section than the gear discharge port. In particular, the primary and gear discharge ports may have a circular shape and the primary discharge port may have a diameter at least 33% larger than the diameter of the gear discharge port.

[0061] In one embodiment, the primary discharge orifice may have a larger cross-section than the outlet discharge orifice. In particular, the primary discharge orifice may have a larger cross-section than all other discharge orifices in the chute.

[0062] The larger cross-section of the primary discharge port ensures a greater flow of lubricant to the primary shaft, which needs a greater flow of lubricant than the other shafts of the reducer to ensure its proper lubrication.

[0063] The edges of the spill openings may be formed integrally with the bottom surface of the drainage floor.

[0064] At least a portion of the discharge openings of the chute may be surrounded by raised edges. Preferably, all of the openings of the chute are surrounded by raised edges.

[0065] The height of the elevation of the edges of the discharge orifice(s) relative to the bottom surface may be greater than or equal to three times the maximum particle size present in the lubricant, better still greater than or equal to four times, or even five times, the maximum particle size.

[0066] The height of the raised edges can be in the range of 0.5 to 5 mm, better in the range of 1 to 3 mm, even better in the range of 1 to 2 mm, for example 1.5 mm.

[0067] One or more discharge orifices may be extended by a lubricant discharge column. A "discharge column" means a column extending below the chute, starting from the discharge orifice towards a reducer element to be lubricated. The presence of the discharge column allows the lubricant to be delivered more precisely to the reducer elements to be lubricated, limiting leaks and lubricant losses.

[0068] All of the discharge ports may be extended by a lubricant discharge column. Alternatively, at least one port may not be extended by a discharge column.

[0069] In particular, in one embodiment, the primary discharge port may be extended by a discharge column. The secondary discharge port may be extended by a discharge column. The outlet discharge port may not be extended by a discharge column. The gear discharge port may not be extended by a discharge column.

[0070] The discharge column may be a conduit of constant cross-section. Alternatively, the discharge column may have a cross-section that decreases as it moves away from the chute.

[0071] The flow floor of the lubrication chute may have on its bottom surface a plurality of transverse ribs, which are oriented transversely to the direction of circulation of the lubricant.

[0072] By "rib" we mean an upward projection.

[0073] Two consecutive transverse ribs, oriented transversely to the direction of circulation of the lubricant, form between them a retention cavity capable of retaining by decantation the particles transported by the lubricant during its flow in the chute.

[0074] The transverse ribs may extend from one guide wall to another guide wall of the chute. They then extend over the entire width of the chute. Alternatively, the transverse ribs may extend over only a portion of the width of the chute. For example, the transverse ribs may extend from a guide wall to an inner wall of the chute. In particular, the chute may have two lubricant circulation corridors, with transverse ribs extending over only one of the corridors.

[0075] The bottom surface may have transverse ribs along its entire length. Alternatively, the bottom surface may have transverse ribs only along a portion of its length.

[0076] The transverse ribs can be straight.

[0077] The flow floor of the lubrication chute may have on its bottom surface a plurality of longitudinal ribs intersecting the transverse ribs, so as to form cavities for retaining particles present in the lubricant.

[0078] The longitudinal ribs may be oriented substantially parallel to the direction of flow of the lubricant. The longitudinal ribs may be oriented substantially parallel to the guide walls.

[0079] The longitudinal ribs may extend from the inlet wall to the closure wall of the chute. Alternatively, the longitudinal ribs may extend only a portion of the length of the chute.

[0080] All transverse ribs can be intersected with longitudinal ribs. Alternatively, only some of the transverse ribs are intersected with longitudinal ribs.

[0081] The crisscrossing can take the form of a grid. The cross-section of the ribs can be more or less fine. All the ribs can have the same thickness. Alternatively, the transverse and longitudinal ribs can have different thicknesses.

[0082] The transverse and longitudinal ribs may have the same height. Alternatively, the transverse ribs may have a different height than the longitudinal ribs. The transverse and longitudinal ribs may have a height between 0.5 and 5 mm, preferably between 1 and 3 mm, preferably between 1 and 2 mm.

[0083] The longitudinal ribs may be straight. The transverse and longitudinal ribs may be formed integrally with the bottom surface of the drainage floor.

[0084] The lubricant flow paths may all have transverse ribs or an intersecting of transverse and longitudinal ribs. Alternatively, at least one of the flow paths may not have ribs, to expedite the delivery of lubricant to a discharge port located in the flow path or at its end. At least one flow path may not have ribs and at least one flow path may have ribs.

[0085] The retention cavities formed by the intersecting ribs allow the particles carried by the lubricant to be retained by settling as it flows through the chute. Creating retention cavities by intersecting ribs is simpler than manufacturing cavities by offsetting the floor of the chute. This limits the size of the chute and makes it possible to stiffen the structure of the chute and limit the effects of vibrations due to the operation of the reducer.

[0086] The elevation of the edges of one or more of the discharge orifices may be greater than or equal to the height of the transverse and / or longitudinal ribs, in particular equal to the height of the transverse and / or longitudinal ribs. The significant elevation of the edges of the discharge orifices forms a final barrier before discharge and thus makes it possible to retain by decantation the particles which would not have been previously retained by the ribs.

[0087] The flow floor of the chute may extend over a single level. Alternatively, the chute may comprise at least one internal wall, on either side of which the floor level is different, so that the lubricant circulation corridors provided by this wall are substantially offset in height.

[0088] The offset of the flow corridors makes it easier to separate the flow of lubricant entering the chute into several flows.

[0089] The difference in floor level on either side of the internal walls can be between 5 and 20 mm, better between 6 and 15 mm, better between 7 and 10 mm, for example around 8.5 mm.

[0090] In particular, the chute may comprise an internal wall providing two circulation corridors with the guide walls, and the flow floor may have a different level on either side of the internal wall so that the two lubricant circulation corridors are substantially offset in height.

[0091] The chute may comprise several internal walls, on either side of which the floor level is different, so that the lubricant circulation corridors provided by this wall are significantly offset in height.

[0092] In one embodiment, the chute may comprise an inner wall providing two circulation corridors with the guide walls, and the flow floor may have a different level on either side of the inner wall so that the two lubricant circulation corridors are substantially offset in height, the lowest corridor having ribs and the highest corridor not having ribs, a primary discharge orifice being provided in the floor at the end of the highest corridor.

[0093] The offset of the passages and the absence of ribs on the uppermost passage leading to the primary discharge port ensures rapid distribution and a greater flow of lubricant to the input shaft located below the primary discharge port.

[0094] The chute may have a lower support zone, in particular a rigid one, extending under the chute and intended to come to bear against a bearing of the reducer. The support zone coming to bear against a bearing makes it possible to limit the movement of the chute due to vibrations caused by the operation of the reducer. The lower support zone may be positioned at the end of a discharge column extending from the primary discharge orifice.

[0095] The chute may have an upper support zone, in particular a rigid one, extending under the chute and intended to come to bear against an internal face of the reducer casing.

[0096] The upper support area may be of a hollowed-out triangular shape.

[0097] The upper bearing area may extend below a chute discharge opening located above an output shaft of the reducer, the upper bearing area being defined by a bearing wall.

[0098] Lubricant exiting the discharge port above the output shaft can thus flow towards the support wall and then towards the output shaft and a bearing supporting it. The support wall can be inserted into a groove in the gearbox housing, leading to the bearing and the output shaft to facilitate the delivery of lubricant to it and prevent leakage.

[0099] The invention also relates, independently or in combination with the above, to a lubrication chute for a reducer of a rotating electrical machine, the chute comprising a flow floor having a bottom surface and one or more discharge orifices provided in the floor, the bottom surface being bordered by guide walls attached to the flow floor, so as to form at least one corridor for circulation of a lubricant towards the discharge orifice(s), and the bottom surface having a plurality of transverse ribs, which are oriented transversely to the direction of circulation of the lubricant.

[0100] The invention also relates to a reducer for a motor vehicle comprising a lubrication chute as described above.

[0101] The reducer according to the invention may comprise a single transmission stage. Alternatively, it may comprise several transmission stages, for example two or three.

[0102] The invention also relates to a propulsion device for a motor vehicle, comprising a reducer as described above and one or two rotating electrical machines.

[0103] The rotating electrical machine(s) may be arranged on either side of the reducer. Each rotating electrical machine may have a shaft connected to a primary shaft of the reducer.

[0104] The invention also relates to a motor vehicle comprising a propulsion 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.

[0105] 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. Brief description of the drawings

[0106] 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.

[0107] [Fig 1] Figure 1 is a partial perspective view of a reducer according to the invention.

[0108] [Fig 2] Figure 2 is another partial perspective view of the reducer of Figure 1.

[0109] [Fig 3] Figure 3 is another partial perspective view of the reducer of Figure 1 without its casing.

[0110] [Fig 4] Figure 4 is a perspective view of the lubrication chute of Figure 1.

[0111] [Fig 5] Figure 5 is a top view of the lubrication chute of Figure 4.

[0112] [Fig 6] Figure 6 illustrates, in part, the inlet wall of the lubrication chute of Figure 4.

[0113] [Fig 7] Figure 7 is a partial perspective view of the reducer of Figure 1.

[0114] [Fig 8] Figure 8 is a partial perspective view of a support area of ​​the lubrication chute of Figure 4.

[0115] [Fig 9] Figure 9 illustrates, in part, the engagement of the lubrication chute support zone within the gearbox housing of Figure 1.

[0116] [Fig 10] Figure 10 is another perspective view of the engagement of a lubrication chute bearing area within the gearbox housing of Figure 1.

[0117] Detailed description

[0118] Figures 1 to 10 illustrate a reducer 1 comprising a lubrication chute 2 attached to a wall of the casing 3 of the reducer 1.

[0119] The reducer 1 comprises a primary shaft 4, a secondary shaft 5 in a transmission stage, and an output shaft 6 carried by a bearing 7 and provided with a toothed output wheel 8, as visible in figure 3.

[0120] The chute 2, illustrated in isolation in Figures 4 to 8, is open upwards and has an L-shape. The chute 2 has a flow floor 9 having a bottom surface 10. It also has two guide walls, a gear-side guide wall 11 and a machine-side guide wall 12, the guide walls 11 and 12 being parallel to each other, as illustrated in Figure 4.

[0121] The guide wall on the reducer side has a height of 9 mm.

[0122] The guide wall on the machine side has a height of 22 mm.

[0123] The guide wall 12 comprises centering pins 13 and rivets 14 configured to cooperate with fixing holes provided in the casing 3 of the reducer in order to allow the chute 2 to be fixed to the casing 3.

[0124] The guide wall 11 comprises a flexible tongue 15 preventing the chute from moving.

[0125] The chute 2 comprises an internal wall 16. The internal wall 16 provides a first circulation corridor 17 for the lubricant with the guide wall 11. The internal wall 16 and the guide wall 12 provide a second circulation corridor 18 for the lubricant. The circulation corridor 17 is narrower than the circulation corridor 18.

[0126] The circulation corridors 17 and 18 extend only over part of the length of the chute and join to form a single circulation corridor 19, arranged between the two guide walls 11 and 12, as seen in Figure 5.

[0127] The chute 2 has an inlet wall 20 arranged transversely to the direction of circulation of the lubricant in the chute. The inlet wall 20 is attached obliquely to the floor 9, as illustrated in Figure 6. The inlet wall 20 comprises a notch 21 arranged opposite the output wheel 8, as visible in Figure 7.

[0128] The chute 2 comprises a closing wall 22 arranged transversely to the direction of circulation of the lubricant and placed at the end of the circulation corridor 19.

[0129] The flow floor 9 of the chute 2 is composed of a first generally horizontal floor portion 23 going from the inlet wall 20 to an intermediate point of the chute and a second oblique floor portion 24 going from this intermediate point to the closing wall 22, as visible in FIG. 7.

[0130] Chute 2 in this example is made of injection-molded plastic.

[0131] In the example described, as seen in Figure 5, the chute has four discharge ports: a primary discharge port 25 located above the primary shaft 4, a secondary discharge port 26 located above the secondary shaft 5 of the transmission stage, an output discharge port 27 located above the output shaft 6 and a gear discharge port 28 located above a gear of the transmission stage.

[0132] The primary discharge orifice 25 is a circle of diameter 4 mm.

[0133] The secondary discharge orifice 26 is a circle with a diameter of 3.5 mm.

[0134] The gear discharge hole 28 is a circle with a diameter of 3 mm.

[0135] The outlet discharge port 27 has an oval shape. It has a largest dimension L of 4.4 mm and a smallest dimension 1 of 2.6 mm.

[0136] The primary discharge orifice 25 has a larger cross-section than all the other chute orifices 26, 27, 28.

[0137] All the discharge openings 25, 26, 27, 28 of the chute are surrounded by a raised rim 37. The raised rims in this example are 1.5 mm. The rims 37 of the discharge openings 25, 26, 27, 28 are formed in one piece with the bottom surface 10 of the flow floor 9.

[0138] The primary discharge orifice 25 is extended by a discharge column 29 whose cross-section decreases as it moves away from the chute 2. Similarly, the secondary discharge orifice 26 is extended by a discharge column 30 whose cross-section decreases as it moves away from the chute 2.

[0139] Transverse ribs 31 extend over the corridor 18, arranged between the guide wall 12 and the internal wall 16.

[0140] Longitudinal ribs 32 intersect a portion of the transverse ribs 31, so as to form particle receiving cavities 33, making it possible to retain by decantation the undesirable particles transported by the lubricant during its passage through the chute 2.

[0141] The longitudinal ribs 32 are parallel to the direction of circulation of the lubricant in the chute 2. They are also parallel to the guide walls 11 and 12.

[0142] The transverse ribs 31 and longitudinal ribs 32 are rectilinear. In this example, they have the same height of 1.5 mm. They are formed in one piece with the bottom surface 10 of the flow floor 9.

[0143] The lubricant flow path 17 does not have ribs 31, 32. This makes it possible to accelerate the flow of the lubricant towards the primary discharge orifice 25 located at the end of the flow path 17. The level of the flow floor 9 is different on either side of the internal wall 16 so that the flow paths 17 and 18 are offset in height. The flow path 17 is located higher than the flow path 18.

[0144] The level difference between the two traffic lanes 17, 18 is 8.5 mm.

[0145] The chute 2 has a rigid lower support zone 35, shown in Figure 7, extending under the chute and coming to bear against the bearing carrying the primary shaft 4 of the reducer 1.

[0146] The lower support zone 35 is positioned at the end of the discharge column 29 extending the primary discharge orifice 25.

[0147] The chute 2 has a rigid upper support zone 34 extending under the chute and coming to bear against the internal face of the casing 3 of the reducer 1.

[0148] The upper support area 34 is of hollow triangular shape. It extends below the outlet discharge orifice 27.

[0149] The upper bearing zone 34 is defined by a bearing wall, as illustrated in Figure 8. The lubricant leaving the outlet discharge orifice 27 can thus flow towards the bearing wall and then into the groove 36 of the casing 3 of the reducer 1 in the direction of the output shaft 6 and the bearing 7 carrying it.

[0150] Figures 9 and 10 illustrate the engagement of the upper support zone 34 in a groove 36 of the casing 3 of the reducer 1, the groove 36 leading to the bearing 7 and to the output shaft 6 to facilitate the routing of the lubricant thereto and to prevent leaks.

Claims

Claims 1. Lubrication chute (2) of a reducer (1) of a rotating electrical machine, the chute (2) comprising a flow floor (9) having a bottom surface (10) and one or more discharge orifices (25, 26, 27, 28) formed in the flow floor (9), the bottom surface (10) being bordered by guide walls (11, 12) attached to the flow floor (9), so as to form at least one circulation corridor (17, 18, 19) of a lubricant towards the discharge orifice(s) (25, 26, 27, 28), and at least one discharge orifice (25, 26, 27, 28) being surrounded by a raised rim (37).

2. Lubrication chute (2) according to the preceding claim, comprising at least one primary discharge orifice (25), one secondary discharge orifice (26) and one outlet discharge orifice (27) provided in the flow floor (9), these discharge orifices (25, 26, 27) being surrounded by a raised rim (37).

3. Lubrication chute (2) according to the preceding claim, the primary discharge orifice (25) having a larger section than those of the other discharge orifices (26, 27, 28) of the chute (2).

4. Lubrication chute (2) according to any one of the preceding claims, one or more of the discharge orifices (25, 26, 27, 28) being extended by a discharge column (29, 30) of the lubricant.

5. Lubrication chute (2) according to any one of the claims, the flow floor (9) having on its bottom surface (10) a plurality of transverse ribs (31), which are oriented transversely to the direction of circulation of the lubricant.

6. Lubrication chute (2) according to the preceding claim, the flow floor (9) having on its bottom surface (10) a plurality of longitudinal ribs (32) intersecting the transverse ribs (31), so as to form retention cavities (33) for particles present in the lubricant.

7. Lubrication chute (2) according to one of the two preceding claims, the elevation of the edges (37) of one or more or more of the discharge orifices (25, 26, 27, 28) being greater than or equal to the height of the transverse ribs (31) and / or longitudinal (32), in particular equal to the height of the transverse (31) and / or longitudinal (32) ribs.

8. Lubrication chute (2) according to any one of the preceding claims, the chute (2) comprising at least one internal wall (16), on either side of which the level of the floor (9) is different, so that the circulation corridors (17, 18) of the lubricant formed by this wall (16) are substantially offset in height.

9. Lubrication chute (2) according to the preceding claim, at least one circulation corridor (17) not having ribs (31, 32) and at least one circulation corridor (18) having ribs (31, 32).

10. Lubrication chute (2) according to any one of the preceding claims, the chute (2) having a lower support zone (35), in particular rigid, extending under the chute (2) and intended to come into contact with a bearing of the reducer (1).

11. Lubrication chute (2) according to the preceding claim, the chute (2) having an upper support zone (34) extending below a discharge orifice (27) of the chute located above an output shaft (6) of the reducer (1), the upper support zone being intended to come into contact with the internal face of the casing (3) of the reducer (1).

12. Lubrication chute (2) of a reducer (1) of a rotating electrical machine, the chute (2) comprising a flow floor (9) having a bottom surface (10) and one or more discharge orifices (25, 26, 27, 28) formed in the floor (9), the bottom surface (10) being bordered by guide walls (11, 12) connected to the flow floor (9), so as to form at least one circulation corridor (17, 18, 19) for a lubricant towards the discharge orifice(s) (25, 26, 27, 28), and the bottom surface (10) having a plurality of transverse ribs (31), which are oriented transversely to the direction of circulation of the lubricant, the flow floor (9) having on its bottom surface (10) a plurality of longitudinal ribs (32) intersecting the transverse ribs (31), so as to form retention cavities (33) for particles present in the lubricant.

13. Reducer (1) for a motor vehicle comprising a lubrication chute (2) 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 propulsion device according to the preceding claim.

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