Integrated electric drive housing and electric drive assembly

Abstract

The present invention discloses an integrated electric drive housing and an electric drive assembly. It includes a common end plate, which is provided with a motor bearing hole; an integrally formed motor outer housing is provided on one axial side of the common end plate, and the common end plate and the extension portion together constitute the end of the reducer housing, and the end of the reducer housing has an axial annular flange; the common end plate on the motor outer housing side is provided with an annular cooling groove; a cooling channel is provided between the outer circumferential surface of the motor inner housing sleeved in the motor outer housing and the inner wall of the motor outer housing, and the cooling channel is connected to the annular cooling groove of the common end plate; an oil collecting box is integrally formed on the common end plate on the reducer side, and the annular cooling groove and the axial projection of the oil collecting box have an overlapping portion. The cooling channel on the motor side of the present invention has a long flow path, which improves the heat dissipation effect. It reduces the oil stirring loss and heat generation under high-speed conditions, improves the transmission efficiency of the electric drive assembly, and is conducive to increasing the vehicle's cruising range.

Description

Technical Field

[0001] The present invention relates to a new energy vehicle component technology, and specifically to an integrated technology for an electric drive assembly of a new energy vehicle, in particular to a housing technology for integrating a motor reducer. Background Art

[0002] The electric drive assembly includes the motor and reducer, which is one of the key devices of new energy vehicles. At present, various R&D entities are committed to integrating the motor and reducer to achieve lightweight, improve the cooling performance of the motor reducer assembly, ensure the smooth operation of the assembly, reduce the negative impact of high temperature on the motor and the reducer, improve the lubrication effect of the reducer and extend its service life.

[0003] CN108400670A discloses an integrated housing of a motor reducer with a cooling water channel. The integrated housing of the motor reducer is formed by one-piece casting, and the cooling circulation water channel can form an internal cavity by low-pressure casting. The cooling circulation flow channel formed by die casting is a die-cast inner cavity, which places high requirements on the die casting mold design. Therefore, in order to reduce the difficulty of mold design and reduce the flow resistance and turbulence of the flow channel; the end flow channel in this patent application includes an end cover cooling water channel and a bearing cooling water channel; the end cover cooling water channel is in a semi-fan shape, and the bearing cooling water channel is in a semi-circular ring shape. This has a poor cooling effect on the reducer side. At the same time, although the perpendicular arrangement of the bearing cooling water channel and the end cover cooling water channel is beneficial to the heat dissipation of the motor bearing seat, the mutually perpendicular flow channel setting structure increases the flow resistance and turbulence of the flow channel, and increases the cooling water circulation energy.

[0004] CN108539897A discloses an integrated housing of a motor and a reducer and a casting and welding method thereof. The motor housing adopts an assembled structure, the inner housing is sleeved inside the outer housing of the motor, and a spiral water channel is formed between the inner housing and the outer housing of the motor. However, in this technical solution, there is no flow channel on the end face. It is impossible to cool the reducer side. The cooling effect is poor.

[0005] CN211501568U discloses a powertrain housing and an electric vehicle having the same. The cooling sleeve is embedded in the motor accommodation space and defines a cooling water channel with the inner wall of the housing body. There is no cooling channel on the partition, so the reducer side cannot be cooled. At the same time, the lubrication of the bearing seat by the lubricating oil on the reducer side is only achieved through the oil inlet hole. During the high-speed operation of the reducer, the lubricating oil splashes during the high-speed rotation of the transmission mechanism, causing oil stirring (oil stirring loss) and heat, and the lubricating oil has poor conductivity in the reducer housing. Summary of the invention

[0006] The object of the present invention is to provide an integrated electric drive housing, and an electric drive assembly including the integrated electric drive housing; the motor side of the integrated housing has good cooling and sealing, and the reducer side has good lubrication and cooling.

[0007] One of the technical solutions of the present invention is: an integrated electric drive housing, including a common end plate, the common end plate is provided with a motor bearing hole; an integrally formed motor housing is arranged on one axial side of the common end plate, the other axial side of the common end plate has an extension portion along at least one radial side, the common end plate and the extension portion together constitute a reducer housing end, the reducer housing end has an axial annular flange, the reducer housing end and the annular flange constitute a cavity for accommodating a reduction transmission mechanism; the common end plate on the motor housing side is provided with an annular cooling groove; and further comprising:

[0008] The motor inner housing is sleeved in the motor outer housing; a cooling channel is arranged between the outer circumferential surface of the motor inner housing and the inner wall of the motor outer housing, and the cooling channel is connected to the annular cooling groove of the common end plate; a cooling medium inlet is arranged on the motor outer housing, and a cooling medium outlet is respectively connected to the cooling channel;

[0009] An oil collecting box is integrally formed on the common end plate on the reducer side, and the annular cooling groove and the axial projection of the oil collecting box have an overlapping portion; the oil collecting box is used to temporarily hold the splashed lubricating oil.

[0010] The cooling channel on the motor side of the present invention has a long flow path, especially the annular cooling groove on the common end plate, which surrounds the entire motor shaft hole. On the basis of meeting the overall strength, the flow path length and flow area are greatly increased, thereby improving the heat dissipation effect. An annular cooling groove is arranged on the common end plate, which is conducive to the setting of the component forming mold in the groove. It is important that an oil collecting box is arranged on the common end plate on the reducer side of the present invention, and the lubricating oil splashed into the oil collecting box is temporarily allowed to stand still, especially for the splashed lubricating oil of the high-speed reduction mechanism. The oil stirring loss and heat generation under high-speed working conditions are reduced by temporarily standing still. At the same time, the overlapping parts of the axial projections of the oil collecting boxes and the annular cooling grooves on both sides of the common end plate are respectively arranged. When the cooling medium flows through the annular cooling groove, the heat of the lubricating oil in the oil collecting box is directly exchanged with the medium, thereby realizing direct heat dissipation by the lubricating oil.

[0011] The common end plate is cleverly used for structural design, which is compact and beneficial to improving the transmission efficiency of the electric drive assembly. It can significantly reduce the temperature rise and extend the service life of the electric drive product.

[0012] Further optimized technical features are: the medium inflow section of the annular cooling groove is provided with a diverter guide plate, which divides the incoming medium into two paths and flows around the annular cooling groove; the medium outflow section is provided with a baffle plate, and the two media flow together and flow out after passing through the baffle plate.

[0013] The flow diversion guide plate smoothly diverts the incoming medium into two directions to form a flow in two directions, which accelerates the flow efficiency of the cooling medium in the annular cooling groove and improves the heat exchange efficiency; when the two media flowing in opposite directions meet and converge, they are blocked by the baffle plate to avoid turbulence caused by the impact of the two media, ensure the smooth convergence of the two media, and avoid heat accumulation caused by turbulence.

[0014] A further optimized technical feature is that the flow splitter guide plate is an arc-shaped flow splitter guide plate, and the connection between the arc-shaped flow splitter guide plate and the annular cooling groove wall is the highest point of the circumference of the annular cooling groove wall.

[0015] The arc-shaped flow splitting guide plate may be composed of, but not limited to, a straight line segment and a tangent arc segment, or may be composed of one arc segment or a plurality of tangent arc segments; the arc opening faces upward.

[0016] The above-mentioned connection point is the circumferential highest point of the annular cooling groove wall, which includes not only the circumferential highest point, but also the position close to the circumferential highest point, such as the distance from the circumferential highest point is no more than 5 mm.

[0017] A further optimized technical feature is that the oil collecting box comprises:

[0018] The bottom plate of the oil collecting box, the two sides of the bottom plate of the oil collecting box extend upward to form the oil inlet side wall and the oil outlet side wall of the oil collecting box; there is an oil inlet gap between the oil inlet side wall and the inner wall of the annular flange, and there is an oil outlet gap between the oil outlet side wall and the inner wall of the annular flange; an oil baffle is arranged in the oil collecting box, and the oil baffle blocks the oil inlet gap and the oil outlet gap.

[0019] At least the oil collecting box bottom plate, the oil inlet side wall, the oil outlet side wall and the common end plate form a containing cavity.

[0020] The oil inlet side wall and / or the oil outlet side wall are not perpendicular to the horizontal plane.

[0021] The above-mentioned annular flange inner wall includes the upper part of the inner wall of the side edge of the annular flange inner wall (close to the top of the annular flange inner wall) and the top of the annular flange inner wall; it may also only include the top of the annular flange inner wall.

[0022] The lubricating oil splashed from the oil inlet gap falls into the bottom of the oil collecting box under the obstruction of the oil baffle plate, preventing the high-speed splashing lubricating liquid from splashing out directly through the oil inlet gap and the oil outlet gap.

[0023] A further optimized technical feature is that the oil collecting box bottom plate comprises two bottom plates, which are integrally formed into a "V" shape, and an oil leakage hole is provided on the bottom plate on the oil inlet gap side and / or the bottom plate on the oil outlet gap side, and the oil leakage hole is higher than the lowest point of the bottom plate.

[0024] The "V" shape may be formed by, but is not limited to, two straight bottom plates, or a straight bottom plate and an arc bottom plate, or two arc bottom plates.

[0025] For the lubricating oil temporarily resting in the bottom plate of the "V"-shaped oil collecting box, the splashed lubricating oil will splash out from the oil outlet gap through the sloped bottom plate.

[0026] Further optimized technical features are: the oil collecting box is located above the motor shaft hole and extends to above the first bearing hole of the reducer; the oil leakage hole of the oil collecting box bottom plate is connected to the bearing lubrication and cooling oil channel of the first bearing hole.

[0027] This design scheme is conducive to the utilization of lubricating oil overflowing from the oil collecting box. Since the oil collecting box and the annular cooling groove have an overlapping portion, the lubricating oil in the oil collecting box can be cooled down by the medium flowing through the annular cooling groove. The cooled lubricating oil overflows into the first bearing hole, which is conducive to improving the cooling and lubrication of the closed intermediate bearing.

[0028] A further optimized technical feature is that an "L" oil guide plate is provided between the bearing limit flanges of the first bearing hole of the reducer and the second bearing hole of the reducer, and the "L" oil guide plate guides the splashed lubricating oil to the first bearing hole of the reducer and the second bearing hole of the reducer respectively. This design actively guides the splashed lubricating oil and is also conducive to improving the efficiency of the lubricating oil entering the first bearing hole and the second bearing hole.

[0029] A further optimized technical feature is that the "L" oil guide plate is arranged opposite to the oil inlet side wall of the oil collecting box, and the splashed lubricating oil is blocked by the oil inlet side wall of the box and falls down, and the "L" oil guide plate guides the splashed lubricating oil to the first bearing hole and the second bearing hole of the reducer respectively.

[0030] The oil inlet side wall of the oil collecting box in this design not only serves as a component of the oil collecting box cavity, but also guides the splashing lubrication. Compared with the "L" oil guide plate, it allows the splashing lubricating oil to flow along a set path, thereby improving the efficiency of the lubricating oil entering the first bearing hole and the second bearing hole.

[0031] Further optimized technical features are: an exhaust hole is provided at the top of one side of the annular flange of the reducer, an oil baffle is provided on the inner wall of the annular flange on the side of the exhaust hole, the oil baffle extends from the top to the lower part of the cavity, a downwardly inclined first baffle is provided at the upper part of the oil baffle near the exhaust hole side, a downwardly inclined second baffle is provided on the side wall of the annular flange opposite to the oil baffle, the first baffle and the second baffle are stacked and crossed up and down; the oil baffle, the top of the annular flange and the side wall of the annular flange constitute an exhaust channel.

[0032] The exhaust passage is located on the common end plate, and a special exhaust passage is arranged on the side of the motor shaft hole, away from the extension part.

[0033] The exhaust passage and the annular cooling groove are adjacent to each other or have an overlapping portion in their axial projections; the cooling medium flowing through the annular cooling groove cools the oil and gas in the exhaust passage, and the relatively low temperature is conducive to the separation of the oil and gas.

[0034] A further optimized technical feature is that: the end faces of the motor inner housing and the motor outer housing in contact are welded and sealed, and the motor inner housing and the motor outer housing are axially interference-fitted and connected.

[0035] The second technical solution of the present invention is: an integrated electric drive assembly, which includes the integrated electric drive housing of the above technical solution, and components constituting the motor are arranged on one side of the housing; components constituting the reducer are arranged on the other side of the housing, and the output shaft of the motor constitutes the input shaft of the reducer.

[0036] The motor housing and reducer housing are integrated into an integrated design. The motor inner housing is welded to the motor outer housing. The electric drive housing has a high degree of integration, which saves connecting bolts, has a simple structure, is easy to assemble, realizes a lightweight design, and improves power density.

[0037] The water channel between the inner and outer shells of the motor is sealed by welding. After welding, the seal is firm and reliable, solving the problem of coolant leakage.

[0038] An oil collecting box is provided in the reducer housing to reduce oil churning loss and heat generation under high-speed conditions, improve the transmission efficiency of the electric drive assembly, and help increase the vehicle's cruising range;

[0039] In the cooling system of the electric drive assembly, in addition to the motor water channel, there is also an end water channel, which can cool the motor stator and rotor, motor bearings and reducer at the same time. The end water channel is provided with a heat dissipation rib plate, which guides the flow of coolant while increasing the heat exchange area, thereby improving the heat dissipation performance of the cooling system and ensuring the service life and reliability of the electric drive product. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of the integrated electric drive housing;

[0041] Figure 2 A schematic diagram of the main cross-section of the integrated electric drive housing;

[0042] Figure 3 Schematic diagram of the end face flow channel of the common end plate of the integrated electric drive housing;

[0043] Figure 4 Schematic diagram of the flow channel in the motor housing A;

[0044] Figure 5 Schematic diagram of the flow channel in the motor housing B;

[0045] Figure 6Schematic diagram of the integrated electric drive housing reducer cavity structure;

[0046] Figure 7 Schematic diagram of splash lubrication oil circuit of integrated electric drive housing reducer cavity;

[0047] Figure 8 Schematic diagram of the exhaust channel structure of the reducer cavity. DETAILED DESCRIPTION

[0048] The embodiments of the present invention are described in detail below, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0049] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] like Figure 1As shown in Figure 2, the integrated electric drive housing in the embodiment includes a common end plate 100, and a motor bearing hole 101 is opened on the common end plate 100, in which the motor bearing is installed and positioned by the motor bearing hole 101 (not shown in the figure). An integrally formed motor outer shell 102 is provided on one axial side of the common end plate, and the inner cavity of the motor outer shell 102 is a cylinder. A cooling medium inlet and a cooling medium outlet are provided on the outer wall of the motor outer shell 102, and the cooling medium in the embodiment is water; the water inlet 103 is provided on the side away from the common end plate 100, and the water outlet 105 is provided close to the common end plate 100. The motor outer shell 102 is connected to the motor inner shell 104; the motor inner shell 104 is a separate part and is assembled in the motor outer shell 102. An interference fit connection structure is adopted between the motor outer shell 102 and the motor inner shell 104.

[0053] The assembled motor outer shell 102 and the motor inner shell 104 form an integral motor shell, and a cooling channel is provided between the outer circumferential surface of the motor inner shell and the inner wall of the motor outer shell. The end faces of the motor outer shell 102 and the motor inner shell 104 in contact are welded and sealed. In the embodiment, the motor outer shell 102 and the motor inner shell 104 have an inner welded sealing ring 107 between the end faces at the motor bearing hole, and the motor outer shell 102 and the motor inner shell 104 have an outer welded sealing ring 106 between the outer end faces. The two welded sealing rings are formed by friction welding, and the sealing is firm and reliable after welding, which solves the problem of coolant leakage in the cooling channel.

[0054] like Figure 4 As shown in Figure 5, the motor inner housing 104 is a cylindrical barrel. The motor inner housing 104 includes an end plate 1041 with an opening that fits with a common end plate, an inner wall 1042 of the motor cylindrical inner housing axially extending from the edge of the end plate 1041, and a cooling channel spiral groove 1043 is provided on the circumferential surface of the inner wall 1042. The starting end of the spiral groove 1043 away from the end plate 1041 is the inner housing water inlet level 1044, which is relatively connected to the water inlet 103 on the motor outer housing 102. The end of the spiral groove 1043 close to the end plate 1041 is the inner housing water outlet level 1045, which is relatively connected to the water outlet 105 on the motor outer housing 102. After assembly, the inner housing water outlet level 1045 is located at the highest point of the circumference, or passes the highest point of the circumference and is adjacent to the highest point of the circumference.

[0055] The water outlet level 1045 of the inner shell is arranged at the last spiral groove layer, located at the highest point of the circumference, or beyond the highest point of the circumference and adjacent to the highest point of the circumference.

[0056] like Figure 4As shown, a water outlet 1047 is provided at the upper end of the end plate 1041; the water outlet 1047 is close to the inner shell water outlet level 1045, and the angle between the water outlet 1047 and the center point of the inner shell water outlet level 1045 does not exceed 45 degrees. A guide rib plate 1046 is provided in the sub-final spiral groove layer adjacent to the inner shell water outlet level 1045, and the guide rib plate 1046 divides the flow channel of the sub-final spiral groove layer 1049 into two parts along the water flow direction, one part continues to form the final spiral groove layer along the spiral direction, and the other part is connected to the water outlet 1047 at the upper end of the end plate 1041.

[0057] A water inlet 1048 is provided at the lower end of the end plate 1041 , and the water inlet 1048 is connected to the last spiral groove layer 1050 .

[0058] like Figure 3 As shown, the common end plate 100 is provided with an annular cooling groove 110; the annular cooling groove 110 is arranged around the motor bearing hole. The water inlet section 1101 of the annular cooling groove 110 extends to the inner edge of the common end plate 100 to form a water inlet 1107; the water inlet 1107 is arranged opposite to the water outlet 1047 at the upper end of the end plate 1041, and the water inlet 1107 is connected to the water outlet 1047 after assembly. That is, the water inlet section 1101 of the annular cooling groove 110 is arranged close to the highest point of the circumference, and the angle between the center point of the water inlet section 1101 (water inlet 1107) and the center point of the highest point of the circumference does not exceed 45 degrees.

[0059] The water outlet section 1102 of the annular cooling groove 110 is located at the lower portion of the annular cooling groove 110 , and is arranged opposite to the water inlet 1048 at the lower end portion of the end plate 1041 .

[0060] A diverter guide plate 1103 is provided in the water inlet section 1101 of the annular cooling groove 110. In the embodiment, the diverter guide plate 1103 is in an arc shape, and the connection between the diverter guide plate 1103 and the groove wall of the annular cooling groove is the circumferential highest point of the groove wall 1110 of the annular cooling groove. The connection here includes a tangential connection between the diverter guide plate 1103 and the groove wall of the annular cooling groove, or a non-tangential connection. The above-mentioned connection is the circumferential highest point of the groove wall of the annular cooling groove, which includes not only the circumferential highest point, but also the position close to the circumferential highest point, such as a distance from the circumferential highest point not exceeding 5 mm. The front end of the water inlet section 1101 is a water inlet 1107; after assembly, the water inlet 1107 is connected to the water outlet 1047 on the end plate 1041.

[0061] The flow dividing and guiding plate 1103 divides the cooling medium entering the annular cooling groove 110 into two paths, one path flows clockwise and the other path flows counterclockwise. The structure of the flow dividing and guiding plate in the embodiment ensures that the medium flowing clockwise is smooth and the medium flowing counterclockwise flows quickly to a lower position.

[0062] A baffle plate 1104 is provided in the water outlet section 1102 of the annular cooling groove 110, and the baffle plate 1104 is set as a vertical plate; one end of the baffle plate 1104 is connected to the wall of the annular cooling groove, and the other end extends out of the annular cooling groove, and is in the annular cooling groove water outlet 1106. After assembly, the annular cooling groove water outlet 1106 is connected to the water inlet 1048 provided at the lower end of the end plate 1041. The medium flowing clockwise and the medium flowing counterclockwise are blocked by the baffle plate and change direction to flow from the annular cooling groove water outlet into the spiral groove layer at the end of the end plate 1041.

[0063] like Figure 6 As shown, the other axial side of the common end plate 100 has an extension portion at least along one radial side, and the common end plate and the extension portion together constitute the end of the reducer housing, and the end of the reducer housing has an axial annular flange 203, and the end of the reducer housing and the annular flange constitute a cavity for accommodating the reduction transmission mechanism, the reducer half housing 200. The annular flange 203 forms the side wall of the reducer, including the upper and lower left and right continuous ring. The end face of the annular flange 203 is a flange connection surface, which is connected to the other half housing of the reducer by bolts to form a complete reducer housing.

[0064] In the embodiment, the reducer housing is provided with three parallel transmission shaft connection structures, which are the corresponding inputs of the motor bearing hole 101 on the common end plate 100; the first reducer bearing hole 201 adjacent to the motor bearing hole 101, and the second reducer bearing hole 202 adjacent to the first reducer bearing hole 201. The three hole centers form a triangle; the first reducer bearing hole 201 is at the lowest position.

[0065] An oil collecting box 220 is integrally formed on the common end plate 100 in the cavity of the reducer housing. In the embodiment, the oil collecting box 220 is located above the motor bearing hole 101 and extends to above the first reducer bearing hole 201.

[0066] The oil collecting box 220 includes a bottom plate 221. In the embodiment, the bottom plate 221 is composed of two plates. The two plates form a "V" shape, forming a structure with a low middle and high ends. The "V"-shaped structure can increase the area in a shorter horizontal distance, thereby increasing the volume. In the structural design, it is beneficial to reduce the radial size of the reducer housing. The two ends of the two plates extend upward to form an oil inlet side wall 222 and an oil outlet side wall 223 respectively. There is an oil inlet gap 224 between the oil inlet side wall 222 and the inner wall of the annular flange, and there is an oil outlet gap 225 between the oil outlet side wall 223 and the inner wall of the annular flange. In the embodiment, the inner wall of the annular flange is the inner wall of the top of the annular flange. The oil inlet side wall 222 and the oil outlet side wall 223 are not perpendicular to the horizontal plane. There is an obtuse angle between the oil inlet side wall 222 and the oil inlet side bottom plate; there is an obtuse angle between the oil outlet side wall 223 and the oil outlet side bottom plate.

[0067] like Figure 7As shown, an oil baffle plate 226 is provided in the oil collecting box 220, and the oil baffle plate 226 is integrally formed with the inner wall of the top of the annular flange and the common end plate 100. The oil baffle plate 226 blocks the oil inlet gap and the oil outlet gap. The oil baffle plate 226 of the embodiment extends from top to bottom to the lowest position of the "V" shape of the two plates; a connecting channel 227 is opened at the lower part of the oil baffle plate 226 to connect the oil inlet side and the oil outlet side of the oil collecting box. The connecting channel 227 can be, but is not limited to, the gap between the oil baffle plate 226 and the bottom plate, and a through groove and / or through hole is opened at the lower part of the oil baffle plate 226.

[0068] The oil side bottom plate is located above the first reducer bearing hole 201, and an oil leakage hole 228 is provided on the oil inlet side bottom plate (also called the bottom plate on the oil inlet gap side), and the oil leakage hole is higher than the lowest point of the bottom plate. The oil leakage hole 228 is connected to the bearing limit ring of the first reducer bearing hole 201 through a flow channel to achieve oil spill to lubricate the reducer bearing.

[0069] like Figure 3 As shown, the space in the oil collecting box 220 (the portion above the dotted line) and the axial projection of the annular cooling groove 110 have an overlapping portion.

[0070] like Figure 7 As shown, an "L"-shaped oil guide plate is provided between the first bearing hole 201 of the reducer and the bearing limiting flange (also called a bearing limiting ring) of the second bearing hole 202 of the reducer.

[0071] In the embodiment, the "L" oil guide plate includes a guide plate 231 and a guide plate 232, both of which are straight plates. One end of the guide plate 231 is connected to one end of the guide plate 232 to form an angle. The other end of the guide plate 231 extends to the lubricating oil channel 233 of the bearing limit flange (bearing limit ring) of the first bearing hole 201, and the lubricating oil channel 233 can be but not limited to a hole or a through groove. The other end of the guide plate 232 extends to the lubricating oil channel 234 of the bearing limit flange of the second bearing hole 202, and the lubricating oil channel 234 can be but not limited to a hole or a through groove.

[0072] The connecting point of the guide plate 231 and the guide plate 232 is opposite to the oil inlet side wall 222 .

[0073] like Figure 7As shown, in the embodiment, the lubricating oil in the reducer cavity is thrown out during the high-speed rotation of the gear, splashes along the inner wall of the annular flange, and at the oil inlet side wall 222, a part of it enters the oil collecting box along the oil inlet gap 224, and falls into the bottom of the oil collecting box after being blocked by the oil baffle 226; the lubricating oil at the bottom of the oil collecting box accumulates to the height of the oil leakage hole 228, and overflows into the first reducer bearing hole 202 through the oil leakage hole 228 to lubricate the bearing in the first reducer bearing hole. The lubricating oil temporarily standing in the oil collecting box will flow out of the oil collecting box from the oil outlet gap 225 along the oil outlet side wall 223 under the impact of the splashing lubricating oil. The lubricating oil in the oil collecting box forms a dynamic balance. The heat of the lubricating oil in the oil collecting box is heat-exchanged with the cooling medium in the annular cooling groove 110 on the motor side of the common end plate, and is cooled down.

[0074] It splashes along the inner wall of the annular flange, and at the oil inlet side wall 222, another part is blocked by the oil inlet side wall 222 and reflected to flow downward, falling on the "L" oil guide plate, and flows through the first bearing hole 201 and the second bearing hole 202 through the guide plates 231 and 232 respectively, lubricating the bearings at the two locations respectively.

[0075] The above design forms a constrained flow channel for the splashing of lubricating oil, reduces the churning loss and heat generated by the disorderly splashing of lubricating oil even under high-speed conditions, and improves the lubrication efficiency of bearings and other components. It further improves the transmission efficiency of the electric drive assembly, which is beneficial to increase the vehicle's cruising range.

[0076] like Figure 8 As shown, an exhaust passage is provided in the reducer housing. An oil baffle plate 240 is provided on the common end plate 100 near the motor bearing hole 101, and the upper end of the oil baffle plate 240 is connected to the inner wall of the annular flange. The oil baffle plate extends from the top to the lower part of the cavity, and in the embodiment, extends to the bottom of the motor bearing hole. The oil baffle plate 240 includes an arc segment corresponding to the arc of the motor bearing hole 101, and the arc segment extends to the bottom of the motor bearing hole 101. The oil baffle plate 240 and the top of the annular flange and the side wall of the annular flange constitute an exhaust passage 300. An exhaust hole 301 is provided at the top of one side of the annular flange and is connected to the exhaust passage 300. A first baffle plate 302 inclined downward is provided on the upper part of the oil baffle plate near the exhaust hole, and a second baffle plate 303 inclined downward is provided on the side wall of the annular flange opposite to the oil baffle plate, and the first baffle plate and the second baffle plate are stacked and crossed up and down. Multiple first baffle plates and multiple second baffle plates can be provided respectively. The oil baffle plate prevents splashing lubricating oil from entering the exhaust passage 300. The oil baffle plate extends from the top to the lower part of the cavity, and in the embodiment extends to below the motor bearing hole to increase the length of the exhaust channel 300.

[0077] The exhaust channel 300 and the axial projection of the annular cooling groove are adjacent to each other or have an overlapped portion; the cooling medium flowing through the annular cooling groove cools the oil and gas in the exhaust channel, and the relatively low temperature is conducive to the separation of oil and gas. The crossed first baffle and the second baffle can effectively block the lubricating oil. At the same time, the lubricating oil accumulated on the first baffle and the second baffle flows down along the downwardly inclined first baffle and the second baffle, and the gas bypasses the first baffle and the second baffle and can be discharged from the exhaust hole 301.

[0078] The integrated electric drive housing of the embodiment can be formed by integral casting (die casting); the annular cooling groove on the end face of the common end plate is an open structure, which is conducive to the design, molding and demoulding of the die-casting mold.

[0079] The portion of the oil collecting box bottom plate located above the motor bearing hole (the oil outlet side in the embodiment) is formed by an arc corresponding to the arc of the motor bearing hole, which is beneficial to the design, molding and demoulding of the die-casting mold.

[0080] The portion of the oil collecting box bottom plate located above the first bearing hole of the reducer (the oil inlet side in the embodiment) is formed by an arc corresponding to the arc of the first bearing hole of the reducer, which is beneficial to the design, molding and demoulding of the die-casting mold.

[0081] The arc section of the oil baffle plate 240 in the exhaust channel corresponding to the arc of the motor bearing hole 101 is beneficial to the design, molding and demoulding of the die-casting mold.

[0082] The motor housing side is installed with the stator and rotor bearings and end covers that constitute the motor; the reducer side is installed with the reduction transmission mechanism, and the bearings and end plates form the electric drive assembly. The output shaft of the motor constitutes the input shaft of the reducer, and the second reducer bearing hole of the reducer is the power output shaft.

[0083] The electric drive assembly is highly integrated and lightweight in design, which is beneficial to improving power density, optimizing cooling performance, and improving the efficiency of the electric drive assembly; it is beneficial to increasing the vehicle's cruising range; an end face cooling water channel is provided at the connection between the motor and the reducer, which can cool the motor stator and rotor, motor bearings and reducer at the same time, and a heat dissipation rib plate (diverter guide plate) is provided in the end face water channel, which guides the flow of the coolant while increasing the heat exchange area, thereby improving the heat dissipation performance of the cooling system and ensuring the service life and reliability of the electric drive product.

Claims

1. An integrated electric drive housing, comprising a common end plate, the common end plate is provided with a motor bearing hole; an integrally formed motor housing is arranged on one axial side of the common end plate, the other axial side of the common end plate has an extension portion along at least one radial side, the common end plate and the extension portion together constitute a reducer housing end, the reducer housing end has an axial annular flange, the reducer housing end and the annular flange constitute a cavity for accommodating a reduction transmission mechanism; wherein: The common end plate on the motor housing side is provided with an annular cooling groove; and further comprising: The motor inner housing is sleeved in the motor outer housing; a cooling channel is arranged between the outer circumferential surface of the motor inner housing and the inner wall of the motor outer housing, and the cooling channel is connected to the annular cooling groove of the common end plate; a cooling medium inlet is arranged on the motor outer housing, and a cooling medium outlet is respectively connected to the cooling channel; An oil collecting box is integrally formed on the common end plate on the reducer side, and the annular cooling groove and the axial projection of the oil collecting box have an overlapping portion, and the oil collecting box is used to collect the splashed lubricating oil; The medium inflow section of the annular cooling groove is provided with a flow divider guide plate, which divides the incoming medium into two paths to flow around the annular cooling groove; the medium outflow section is provided with a baffle plate, and the two paths of medium converge and flow out after passing through the baffle plate.

2. The integrated electric drive housing according to claim 1, characterized in that: The flow splitter guide plate is an arc-shaped flow splitter guide plate, and the connection point between the arc-shaped flow splitter guide plate and the groove wall of the annular cooling groove is the highest point of the circumference of the groove wall of the annular cooling groove.

3. The integrated electric drive housing according to claim 1, characterized in that: The oil collection box includes: The bottom of the oil collecting box, both sides of the bottom of the oil collecting box extend upward to form the oil inlet side wall and the oil outlet side wall of the oil collecting box; there is an oil inlet gap between the oil inlet side wall and the inner wall of the annular flange, and there is an oil outlet gap between the oil outlet side wall and the inner wall of the annular flange; an oil baffle is arranged in the oil collecting box, which blocks the oil inlet gap and the oil outlet gap.

4. The integrated electric drive housing according to claim 3, characterized in that: The bottom of the oil collecting box includes two bottom plates, which are integrally formed into a "V" shape. An oil leakage hole is opened on the bottom plate on the oil inlet gap side, and the oil leakage hole is higher than the lowest point of the bottom plate.

5. The integrated electric drive housing according to claim 1, 3 or 4, characterized in that: The oil collecting box is located above the motor shaft hole and extends above the first bearing hole of the reducer; the oil leakage hole at the bottom of the oil collecting box is connected to the bearing lubrication and cooling oil channel of the first bearing hole.

6. The integrated electric drive housing according to claim 1, characterized in that: a reducer An "L"-shaped oil guide plate is provided between the bearing limit flanges of the first bearing hole of the reducer and the second bearing hole of the reducer. The "L"-shaped oil guide plate guides the splashed lubricating oil to the first bearing hole of the reducer and the second bearing hole of the reducer respectively.

7. The integrated electric drive housing according to claim 6, characterized in that: The "L" oil guide plate is arranged opposite to the oil inlet side wall of the oil collecting box. The splashed lubricating oil is blocked by the oil inlet side wall of the box and falls down. The "L" oil guide plate guides the splashed lubricating oil to the first bearing hole of the reducer and the second bearing hole of the reducer respectively.

8. The integrated electric drive housing according to claim 1, characterized in that: An exhaust hole is provided at the top of one side of the annular flange of the reducer, and an oil baffle is provided on the inner wall of the annular flange on the side of the exhaust hole. The oil baffle extends from the top to the lower part of the cavity. A downwardly inclined first baffle is provided at the upper part of the oil baffle near the exhaust hole side, and a downwardly inclined second baffle is provided on the side wall of the annular flange opposite to the oil baffle. The first baffle and the second baffle are stacked and crossed up and down; the oil baffle, the top of the annular flange and the side wall of the annular flange constitute an exhaust channel.

9. An integrated electric drive assembly, characterized by: It comprises the integrated electric drive housing as claimed in claims 1-8, wherein components constituting a motor are arranged on one side of the housing; components constituting a reducer are arranged on the other side of the housing, and the output shaft of the motor constitutes the input shaft of the reducer.

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