CN115027240A - Integrated electric drive shell and electric drive assembly - Google Patents

Abstract

The invention discloses an integrated electric drive shell and an electric drive assembly. The motor bearing comprises a common end plate, wherein the common end plate is provided with a motor bearing hole; the axial side of the shared end plate is provided with an integrally formed motor outer shell, the shared end plate and the extension part jointly form the end part of the reducer shell, and the end part of the reducer shell is provided with an axial annular flange; the common end plate on the side of the motor shell is provided with an annular cooling groove; a cooling flow channel is arranged between the outer circumferential surface of the motor inner shell sleeved in the motor outer shell and the inner wall of the motor outer shell, and the cooling flow channel is communicated with the annular cooling groove of the shared end plate; an oil collecting box is integrally formed on the common end plate at the side of the speed reducer, and the annular cooling groove and the axial projection of the oil collecting box are provided with a superposition part. The cooling flow channel on the motor side of the invention has long flowing line; the heat dissipation effect is improved. The oil stirring loss and the heating under the high-speed working condition are reduced, the transmission efficiency of the electric drive assembly is improved, and the increase of the endurance mileage of the vehicle is facilitated.

Description

Integrated electric drive shell and electric drive assembly

Technical Field

The invention relates to a new energy vehicle part technology, in particular to an integrated technology of an electric drive assembly of a new energy vehicle, and particularly relates to a shell technology integrated with a motor reducer.

Background

The electric drive assembly comprises a motor and a speed reducer, and is one of key devices of a new energy vehicle. At present, each research and development main body is dedicated to motor and reducer integration to realize light weight, the cooling performance of a motor reducer assembly is improved, the stable operation of the assembly is ensured, the negative influence of high temperature on the motor and the negative influence caused by the reducer are reduced, the lubricating effect of the reducer is improved, and the service life is prolonged.

CN108400670A discloses a motor reducer integrated shell with a cooling water channel. The integrated shell of the motor reducer is integrally cast, and the cooling circulation water channel can be cast into an internal cavity through low pressure. The cooling circulation flow passage formed by die casting is an inner cavity formed by die casting, so that the design requirement on a die for die casting is higher. Therefore, the difficulty in designing the die is reduced, and the flow resistance and the turbulent flow of the flow channel are reduced; the end runners in this patent application include end cap cooling water channels and bearing cooling water channels; the end cover cooling water channel is in a half-fan shape, and the bearing cooling water channel is in a semicircular ring shape. This has a poor cooling effect on the reducer side. Meanwhile, the mutually vertical arrangement of the bearing cooling water channel and the end cover cooling water channel is beneficial to heat dissipation of the motor bearing seat, but the mutually vertical flow channel arrangement structure increases the flow resistance and turbulence of the flow channel and increases the cooling water circulation energy.

CN108539897A discloses a motor and reducer integrated shell and its casting and welding method. The motor shell is of an assembled structure, the inner shell is sleeved inside the motor shell, and a spiral water channel is formed between the inner shell and the motor shell. However, in this solution, the end face has no flow channel. Cooling of the reducer side cannot be achieved. The cooling effect is poor.

CN211501568U discloses a powertrain housing and an electric vehicle having the same. The cooling jacket is embedded in the motor accommodating space and defines a cooling water channel with the inner wall of the shell body. The absence of a cooling flow passage in the baffle plate prevents cooling on the reducer side. Meanwhile, the lubricating oil on the side of the speed reducer lubricates the bearing seat only through the oil inlet hole. In the high-speed running process of the speed reducer, lubricating oil splashes in the high-speed rotating process of the transmission mechanism, so that the oil stirring phenomenon (oil stirring loss) and heat generation occur, and the flow conductivity of the lubricating oil in the shell of the speed reducer is poor.

Disclosure of Invention

The invention aims to provide an integrated electric drive shell and an electric drive assembly comprising the integrated electric drive shell; the motor side of the integrated shell has good cooling and sealing, and the speed reducer side has good lubricating and cooling.

One of the technical schemes of the invention is as follows: the integrated electric drive shell comprises a common end plate, and the common end plate is provided with a motor bearing hole; the end part of the reducer shell is provided with an axial annular flange, and the end part of the reducer shell and the annular flange form a cavity for accommodating a speed reduction transmission mechanism; the common end plate on the side of the motor shell is provided with an annular cooling groove; further comprising:

the motor inner shell is sleeved in the motor outer shell; a cooling flow channel is arranged between the outer circumferential surface of the inner shell of the motor and the inner wall of the outer shell of the motor and is communicated with the annular cooling groove of the shared end plate; a cooling medium inlet is formed in the motor outer shell, and the cooling medium outlet is respectively communicated with the cooling flow channel;

an oil collecting box is integrally formed on the common end plate at the speed reducer side, and the annular cooling groove and the axial projection of the oil collecting box are provided with a superposition part; the oil collecting box is used for temporarily standing the splashed lubricating oil.

The cooling flow channel on the motor side of the invention has long flowing line, and particularly the annular cooling groove on the common end plate surrounds the whole motor shaft hole, thereby greatly increasing the flowing area and the flowing line length on the basis of meeting the overall strength and improving the heat dissipation effect. And an annular cooling groove is formed in the shared end plate, so that the arrangement of a forming die of the part in the groove is facilitated. The oil collecting box is arranged on the common end plate at the side of the speed reducer, so that the lubricating oil splashed into the oil collecting box temporarily stands, particularly the splashed lubricating oil of the speed reducer running at a high speed is reduced in stirring loss and heating under a high-speed working condition through temporary standing, meanwhile, the oil collecting boxes at the two sides of the common end plate and the superposed parts of the axial projections of the annular cooling grooves are respectively arranged, and when a cooling medium flows through the annular cooling grooves, the heat of the lubricating oil in the oil collecting box is directly exchanged with the medium, so that the direct heat dissipation of the lubricating oil is realized.

The structure design is carried out by skillfully utilizing the shared end plate, and the structure is compact. The transmission efficiency of the electric drive assembly is improved. The temperature rise is obviously reduced, and the service life of an electric drive product is prolonged.

The further optimization technical characteristics are as follows: a medium inflow section of the annular cooling groove is provided with a shunting guide plate, and the shunting guide plate divides the entering medium into two parts and bypasses the annular cooling groove; the medium outflow section is provided with a flow baffle plate, and the two paths of media flow together and flow out after passing through the flow baffle plate.

The flow dividing guide plate smoothly guides and divides the entering medium into two flows in two directions, so that the flow efficiency of the cooling medium in the annular cooling groove is improved, and the heat exchange efficiency is improved; when two opposite flowing media meet and converge, the two flowing media are blocked by the flow blocking plate, so that the two media are prevented from impacting each other to generate turbulence, the stability of converging of the two media is ensured, and the heat accumulation caused by the turbulence is avoided.

The further optimization technical characteristics are as follows: the diversion guide plate is an arc diversion guide plate, and the joint of the arc diversion 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.

The arc-shaped flow dividing guide plate can be but is not limited to be composed of a straight line section and a tangent arc section, also can be a circular arc section, and also can be composed of a plurality of tangent arc sections; the arc opening faces upwards.

The highest point of the circumference of the groove wall of the annular cooling groove at the joint comprises the highest point of the circumference and also comprises a position close to the highest point of the circumference, for example, the distance from the highest point of the circumference is not more than 5 mm.

The further optimization technical characteristics are as follows: the oil collecting box includes:

the two sides of the oil collecting box bottom plate extend upwards to form an oil inlet side wall and an oil outlet side wall of the oil collecting box; an oil inlet gap is formed between the oil inlet side wall and the inner wall of the annular flange, and an oil outlet gap is formed between the oil outlet side wall and the inner wall of the annular flange; an oil baffle plate is arranged in the oil collecting box and used for blocking an oil inlet gap and an oil outlet gap.

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

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

The inner wall of the annular flange comprises the upper part (close to the top part of the inner wall of the annular flange) of the inner wall at the side edge of the inner wall of the annular flange and the top part of the inner wall of the annular flange; or may include only the top of the inner wall of the annular flange.

Lubricating oil splashed from the oil inlet gap falls into the bottom of the oil collecting box under the blocking of the oil baffle plate, so that the lubricating liquid splashed at a high speed is prevented from being directly splashed out through the oil inlet gap and the oil outlet gap.

The further optimization technical characteristics are as follows: the oil collecting box bottom plate comprises two sections of bottom plates which are integrally formed to form a V shape, oil leakage holes are formed in the bottom plate on the oil inlet gap side and/or the bottom plate on the oil outlet gap side, and the oil leakage holes are higher than the lowest position of the bottom plates.

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

For the lubricating oil temporarily standing in the bottom plate of the V-shaped oil collecting box, the lubricating oil entering in a splashing mode splashes out of the oil outlet gap through the bottom plate with the gradient.

The further optimization technical characteristics are as follows: the oil collecting box is positioned above the motor shaft hole and extends to the position above the first bearing hole of the speed reducer; the oil leakage hole of the oil collecting box bottom plate is communicated with the bearing lubricating and cooling oil duct of the first bearing hole.

This design is favorable to the oil collecting box to spill over the utilization of lubricating oil, because oil collecting box and annular cooling recess have coincidence portion, lubricating oil in the oil collecting box can be cooled down by the medium cooling that annular cooling recess flowed through, and the lubricating oil through the cooling overflows in first bearing hole, is favorable to improving the cooling lubrication who is in confined intermediate bearing.

The further optimization technical characteristics are as follows: an L-shaped oil guide plate is arranged between a first bearing hole of the speed reducer and a bearing limiting flange of a second bearing hole of the speed reducer, and splashed lubricating oil is respectively guided to the first bearing hole of the speed reducer and the second bearing hole of the speed reducer by the L-shaped oil guide plate. The design scheme actively guides the splashed lubricating oil, and is favorable for improving the efficiency of the lubricating oil entering the first bearing hole and the second bearing hole.

The further optimization technical characteristics are as follows: the L-shaped oil guide plate is opposite to the oil inlet side wall of the oil collection box, splashed lubricating oil is blocked by the oil inlet side wall of the oil collection box and falls down, and the L-shaped oil guide plate guides the splashed lubricating oil to the first bearing hole of the speed reducer and the second bearing hole of the speed reducer respectively.

The oil inlet side wall of the oil collecting box in the design scheme has the function of not only forming a part of the containing cavity of the oil collecting box, but also guiding splashed lubricating oil, and the oil guiding plate is opposite to the L-shaped oil guiding plate, so that the splashed lubricating oil flows along a set path, and the efficiency of the lubricating oil entering the first bearing hole and the second bearing hole is improved.

The further optimization technical characteristics are as follows: the top of one side of an annular flange of the speed reducer is provided with an exhaust hole, the inner wall of the annular flange at the side edge of the exhaust hole is provided with an oil baffle plate, the oil baffle plate extends to the lower part of the cavity from the top, the upper part of the oil baffle plate close to the side of the exhaust hole is provided with a first baffle plate inclining downwards, the side wall of the annular flange opposite to the oil baffle plate is provided with a second baffle plate inclining downwards, and the first baffle plate and the second baffle plate are overlapped and crossed up and down; the oil baffle plate, the top of the annular flange and the side wall of the annular flange form an exhaust channel.

The exhaust channels are located on the common end plate, and the special exhaust channels are arranged on the side edge of the motor shaft hole and far away from the extension part.

The axial projections of the exhaust channel and the annular cooling groove form an adjacent relation or have an overlapping part; the cooling medium flowing through the annular cooling groove cools oil and gas in the exhaust channel, and the relatively low temperature is favorable for oil-gas separation.

The further optimization technical characteristics are as follows: and the contact end surfaces of the motor inner shell and the motor outer shell are welded and sealed. The motor inner shell and the motor outer shell are in axial interference fit connection.

The second technical scheme of the invention is as follows: the integrated electric drive assembly comprises an integrated electric drive shell of the technical scheme, wherein one side of the shell is provided with a component forming a motor; the other side of the shell is provided with a component forming a speed reducer, and an output shaft of the motor forms an input shaft of the speed reducer.

The motor outer shell and the reducer shell are integrally designed, the motor inner shell is welded with the motor outer shell, the integration level of the electric drive shell is high, connecting bolts are saved, the structure is simple, the assembly is convenient, the lightweight design is realized, and the power density is improved;

the water channel is sealed between the inner shell and the outer shell of the motor through welding, the sealing is firm and reliable after welding, and the problem of coolant leakage is solved;

an oil collecting box is arranged in the speed reducer shell, so that oil stirring loss and heating under a high-speed working condition are reduced, the transmission efficiency of the electric drive assembly is improved, and the endurance mileage of a vehicle is increased;

in the cooling system of the electric drive assembly, besides the motor water channel, the end surface water channel is further arranged, the motor stator and rotor, the motor bearing and the speed reducer can be cooled simultaneously, the heat dissipation rib plates are arranged in the end surface water channel, the heat exchange area is increased while the cooling liquid flow direction is guided, the heat dissipation performance of the cooling system is improved, and the service life and the reliability of an electric drive product are guaranteed.

Drawings

FIG. 1 is a schematic external view of an integrated electrically driven housing;

FIG. 2 is a schematic main cross-sectional view of an integrated electric drive housing;

FIG. 3 is a schematic view of an end face flow path of a common end plate of an integrated electrically driven housing;

fig. 4 shows a schematic view a of a flow passage of an inner housing of a motor;

fig. 5 shows a schematic view B of a flow passage of an inner housing of the motor;

FIG. 6 is a schematic diagram of a cavity structure of an integrated electrically-driven shell reducer;

FIG. 7 is a schematic diagram of a splash lubrication circuit for a cavity of an integrated electrically-driven shell reducer;

FIG. 8 is a schematic view of the exhaust passage structure of the reducer cavity.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

The invention is described in further detail below with reference to the figures and the specific embodiments.

As shown in fig. 1 and 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, and a motor bearing is installed therein and limited by the motor bearing hole (not shown). An integrally formed motor outer shell 102 is arranged 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 arranged on the outer wall of the motor outer shell 102, and the cooling medium is water in the embodiment; the water inlet 103 is provided on the side away from the common end plate 100, and the water outlet 105 is provided near the common end plate 100. The motor outer shell 102 is connected with the motor inner shell 104; the motor inner housing 104 is a separate component that is assembled to the motor outer housing 102. The motor outer shell 102 and the motor inner shell 104 are connected by interference fit.

The assembled motor outer shell 102 and the assembled motor inner shell 104 form an integral motor housing, and a cooling flow passage is arranged between the outer circumferential surface of the motor inner shell and the inner wall of the motor outer shell. The end surfaces of the motor outer shell 102 and the motor inner shell 104, which are in contact with each other, are welded and sealed, in an embodiment, an inner welding sealing ring 107 is arranged between the end surfaces of the motor outer shell 102 and the motor inner shell 104 at a motor bearing hole, and an outer welding sealing ring 106 is arranged between the end surfaces of the outer end surfaces of the motor outer shell 102 and the motor inner shell 104. The two welding sealing rings are formed by adopting friction welding for sealing, the sealing is firm and reliable after welding, and the problem of cooling liquid leakage of the cooling flow channel is solved.

As shown in fig. 4 and 5, the motor inner housing 104 is a cylindrical barrel, the motor inner housing 104 includes an end plate 1041 with an opening attached to the common end plate, an inner wall 1042 of the motor cylindrical inner housing extending axially at the edge of the end plate 1041, a spiral groove 1043 of a cooling flow channel is formed on the circumferential surface of the inner wall 1042, and a starting end of the spiral groove 1043 away from the end plate 1041 is an inner housing water inlet 1044 and is relatively communicated with the water inlet 103 on the motor outer housing 102. The end of the spiral groove 1043 near the end plate 1041 is an inner housing water outlet level 1045, which is communicated with the water outlet 105 on the motor outer housing 102. After assembly, the inner shell water outlet level 1045 is located at the highest position of the circumference, or adjacent to the highest point of the circumference across the highest position of the circumference.

The inner shell outlet water level 1045 is provided at the end section spiral groove layer, and is located at the highest position of the circumference, or is adjacent to the highest point of the circumference by passing through the highest position of the circumference.

As shown in fig. 4, a water outlet 1047 is formed at the upper end of the end plate 1041; the water outlet 1047 is close to the water outlet level 1045 of the inner shell, and the included angle between the water outlet 1047 and the center point of the water outlet level 1045 of the inner shell is not more than 45 degrees. A flow guide rib plate 1046 is arranged in the secondary tail section spiral groove layer adjacent to the inner shell water outlet position 1045, the flow channel of the secondary tail section spiral groove layer 1049 is divided into two parts by the flow guide rib plate 1046 along the water flow direction, one part continues to form a tail section spiral groove layer along the spiral direction, and the other part is communicated with a water outlet 1047 at the upper end part of the end plate 1041.

A water inlet 1048 is formed in the lower end of the end plate 1041, and the water inlet 1048 is communicated with the last spiral groove layer 1050.

As shown in fig. 3, the common end plate 100 is provided with an annular cooling groove 110; an annular cooling groove 110 is provided around the motor bearing bore. 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 communicated with 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 included angle between the central point of the water inlet section 1101 (the water inlet 1107) and the center of the highest point of the circumference is not more than 45 degrees.

The water outlet section 1102 of the annular cooling groove 110 is located at the lower part of the annular cooling groove 110 and is opposite to the water inlet 1048 at the lower end part of the end plate 1041.

A flow diversion plate 1103 is arranged in the water inlet section 1101 of the annular cooling groove 110. In an embodiment, the diversion baffle 1103 has a circular arc shape, and the connection between the diversion baffle 1103 and the wall of the annular cooling groove is the highest point of the circumference of the wall 1110 of the annular cooling groove. The connections here include a tangential connection, or a non-tangential connection, of the splitter baffle 1103 with the wall of the annular cooling groove. The highest point of the circumference of the groove wall of the annular cooling groove at the joint comprises the highest point of the circumference and also comprises a position close to the highest point of the circumference, for example, the distance from the highest point of the circumference is not more than 5 mm. The front end of the water inlet section 1101 is a water inlet 1107; after assembly, the water inlet 1107 is communicated with a water outlet 1047 on the end plate 1041.

The flow dividing baffle 1103 divides the cooling medium entering the annular cooling groove 110 into two parts, one part flows clockwise, and the other part flows counterclockwise. The structure of the flow dividing guide plate in the embodiment ensures that the medium flowing clockwise smoothly flows and the medium flowing anticlockwise quickly flows to a low position.

A flow baffle plate 1104 is arranged in the water outlet section 1102 of the annular cooling groove 110, and the flow baffle plate 1104 is arranged into a vertical plate; one end of the flow baffle 1104 is connected to the wall of the annular cooling groove, and the other end extends out of the annular cooling groove and is located in the water outlet 1106 of the annular cooling groove. After assembly, the water outlet 1106 of the annular cooling groove is communicated with a water inlet 1048 formed in the lower end part of the end plate 1041. The medium flowing clockwise and the medium flowing anticlockwise are blocked by the baffle plate to change the direction and flow into the spiral groove layer at the tail end of the end plate 1041 from the water outlet of the annular cooling groove.

As shown in fig. 6, the other axial side of the common end plate 100 has an extended portion on at least one radial side, the common end plate and the extended portion together form a reducer case end portion, the reducer case end portion has an axial annular flange 203, and the reducer case end portion and the annular flange form a cavity for accommodating a reduction transmission mechanism, and the reducer half case 200. The annular flange 203 forms a sidewall of the decelerator and includes an upper, lower, left, and right continuously formed in a ring shape. The end face of the annular flange 203 is a flange connecting face, and is connected with the other half shell of the speed reducer through bolts to form a complete shell of the speed reducer.

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

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

The oil collecting box 220 comprises a bottom plate 221, in the embodiment, the bottom plate 221 is composed of two plate members, and the two plate members form a V shape to form a structural form with a low middle part and high two ends; the V-shaped structure can increase the area at a shorter horizontal distance, thereby increasing the volume. The radial size of the speed reducer shell is reduced in the structural design. Two ends of the two plates extend upwards to form an oil inlet side wall 222 and an oil outlet side wall 223 respectively. An oil inlet gap 224 is formed between the oil inlet side wall 222 and the inner wall of the annular flange, and an oil outlet gap 225 is formed 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 sidewall 222 and the oil outlet sidewall 223 are not perpendicular to the horizontal plane. An obtuse angle is formed between the oil inlet side wall 222 and the oil inlet side bottom plate; the oil outlet side wall 223 and the oil outlet side bottom plate form an obtuse angle therebetween.

As shown in fig. 7, an oil baffle 226 is disposed in the oil collecting box 220, and the oil baffle 226 is integrally formed with the top inner wall of the annular flange and the common end plate 100. The oil baffle 226 blocks the oil inlet gap and the oil outlet gap. The oil baffle 226 of the embodiment extends from top to bottom to the lowest position of the two plate members in the shape of a V; the lower part of the oil baffle 226 is provided with a communication channel 227 which communicates the oil inlet side with the oil outlet side of the oil collecting box. The communication channel 227 may be, but is not limited to, a gap between the oil baffle 226 and the bottom plate, and a through groove and/or a through hole is formed in the lower portion of the oil baffle 226.

The oil side base plate is located above the first speed reducer bearing hole 201, and an oil leakage hole 228 is formed in the oil inlet side base plate (also called the base plate on the oil inlet clearance side), and is higher than the lowest position of the base plate. The oil leakage hole 228 is communicated with the bearing limit ring of the first speed reducer bearing hole 201 through a flow passage, so that oil spilling is realized to lubricate a speed reducer bearing.

As shown in fig. 3, the space (portion above the dotted line) inside the oil sump case 220 has an overlap with the projection of the annular cooling groove 110 in the axial direction.

As shown in fig. 7, an oil guide plate of "L" is provided between a first bearing hole 201 of the reduction gear and a bearing limit flange (also referred to as a bearing limit ring) of a second bearing hole 202 of the reduction gear.

In an embodiment, the oil deflector of the "L" includes a deflector 231 and a deflector 232, both of which are straight plates. One end of the baffle 231 and one end of the baffle 232 are connected to form an angle. The other end of the deflector 231 extends to a lubrication passage 233 of a bearing retainer flange (bearing retainer ring) of the first bearing hole 201, and the lubrication passage 233 may be, but is not limited to, a hole or a through groove. The other end of the deflector 232 extends to a lubrication passage 234 of the bearing stop flange of the second bearing bore 202. the lubrication passage 234 may be, but is not limited to, a hole or a through slot.

The junction intersection of the baffle 231 and the baffle 232 is opposite the oil inlet sidewall 222.

As shown in fig. 7, in the embodiment, the lubricating oil in the cavity of the speed reducer 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 the lubricating oil enters the oil collecting box along the oil inlet gap 224 and falls into the bottom of the oil collecting box through the blocking of the oil baffle 226; the lubricating oil at the bottom of the oil collecting box is accumulated 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 temporarily standing lubricating oil in the oil collecting box can 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 splashed lubricating oil. The lubricating oil in the oil collecting box forms dynamic balance. The heat of the lubricating oil in the oil collecting box exchanges heat with the cooling medium in the annular cooling groove 110 on the motor side of the common end plate, and is cooled.

The oil splashes along the inner wall of the annular flange, and at the position of the oil inlet side wall 222, the other part of the oil splashes are blocked by the oil inlet side wall 222 to reflect and flow downwards, fall on the oil guide plate of the L, and respectively flow through the first bearing hole 201 and the second bearing hole 202 through the guide plate 231 and the guide plate 232 to lubricate the bearings at the two positions.

The design forms a constraint flow channel for splashing lubricating oil, reduces the oil stirring loss and heat generated by disordered splashing lubricating oil even under a high-speed working condition, and improves the lubricating efficiency of components such as a bearing. And then improve the transmission efficiency of electric drive assembly, be favorable to increasing the continuation of the journey mileage of vehicle.

As shown in fig. 8, an exhaust passage is provided in the gear case. An oil baffle plate 240 is arranged on the common end plate 100 close to the motor bearing hole 101, the upper end of the oil baffle plate 240 is connected with the inner wall of the annular flange, and the oil baffle plate extends to the lower part of the cavity from the top and extends to the position below the motor bearing hole in the embodiment. The oil deflector 240 includes an arc segment corresponding to the arc of the motor bearing hole 101, the arc segment extending below the motor bearing hole 101. The oil deflector 240 and the top of the annular flange and the side wall of the annular flange form the exhaust passage 300. The top of one side of the annular flange is provided with an exhaust hole 301 communicated with the exhaust channel 300. The upper part of the oil baffle close to the exhaust hole is provided with a first baffle 302 inclined downwards, the side wall of the annular flange opposite to the oil baffle is provided with a second baffle 303 inclined downwards, and the first baffle and the second baffle are overlapped and crossed up and down. The first baffle and the second baffle can be respectively provided in plurality. The oil baffle blocks the splashed lubricating oil from entering the exhaust passage 300. The oil deflector extends from above to the lower portion of the cavity, in embodiments extending below the motor bearing bore to increase the length of the exhaust passage 300.

The exhaust channel 300 is in adjacent relationship or has an overlap with the axial projection of the annular cooling groove; the cooling medium flowing through the annular cooling groove cools oil and gas in the exhaust channel, and the relatively low temperature is favorable for oil-gas separation. The crossed first baffle and the second baffle can effectively block lubricating oil, meanwhile, the lubricating oil gathered on the first baffle and the second baffle flows down along the first baffle and the second baffle which are inclined downwards, and gas can be discharged from the exhaust hole 301 by bypassing the first baffle and the second baffle.

The integrated electrically-driven housing of an embodiment may be formed by integral casting (die-casting); the annular cooling groove on the end face of the shared end plate is of an open structure, and design forming and demolding of the die-casting die are facilitated.

The part (in the embodiment, the oil outlet side) of the oil collecting box bottom plate above the motor bearing hole is formed by adopting an arc opposite to the arc of the motor bearing hole, so that the design forming and the demoulding of the die-casting die are facilitated.

The part (in the embodiment, the oil inlet side) of the oil collecting box bottom plate above the first bearing hole of the speed reducer is formed by an arc opposite to the arc of the first bearing hole of the speed reducer, and design forming and demolding of a die-casting mold are facilitated.

The oil baffle 240 in the exhaust passage and the arc section corresponding to the arc of the motor bearing hole 101 are beneficial to design, forming and demolding of the die-casting die.

A stator and rotor bearing and an end cover which form the motor are arranged on the side of the motor shell; the speed reducer side is provided with a speed reduction transmission mechanism, and the bearing and the end plate form an electric drive assembly. The output shaft of the motor forms the input shaft of the speed reducer, and the bearing hole of the second speed reducer of the speed reducer is a power output shaft.

The electric drive assembly is high in integration height, the lightweight design is realized, the power density is favorably improved, the cooling performance is optimized, and the efficiency of the electric drive assembly is improved; the endurance mileage of the vehicle is increased; the end face cooling water channel is arranged at the joint of the motor and the speed reducer, the motor stator and rotor, the motor bearing and the speed reducer can be cooled simultaneously, the heat dissipation rib plate (shunt guide plate) is arranged in the end face water channel, the heat exchange area is increased when the flow direction of the cooling liquid is guided, the heat dissipation performance of the cooling system is improved, and the service life and the reliability of an electric drive product are guaranteed.

Claims (10)

1. An integrated electrically-driven shell comprises a common end plate, wherein a motor bearing hole is formed in the common end plate; the end part of the reducer shell is provided with an axial annular flange, and the end part of the reducer shell and the annular flange form a cavity for accommodating a speed reduction transmission mechanism; the method is characterized in that: the common end plate on the side of the motor shell is provided with an annular cooling groove; further comprising:

the motor inner shell is sleeved in the motor outer shell; a cooling flow channel is arranged between the outer circumferential surface of the inner shell of the motor and the inner wall of the outer shell of the motor and is communicated with the annular cooling groove of the shared end plate; a cooling medium inlet is formed in the motor outer shell, and the cooling medium outlet is respectively communicated with the cooling flow channel;

an oil collecting box is integrally formed on the common end plate at the side of the speed reducer, the annular cooling groove and the axial projection of the oil collecting box are provided with a superposition part, and the oil collecting box is used for standing the splashed lubricating oil.

2. The integrated electric drive housing of claim 1 wherein: a medium inflow section of the annular cooling groove is provided with a shunting guide plate, and the shunting guide plate divides the entering medium into two bypass annular cooling grooves; the medium outflow section is provided with a flow baffle plate, and the two paths of media flow together and flow out after passing through the flow baffle plate.

3. The integrated electric drive housing of claim 2 wherein: the diversion guide plate is an arc diversion guide plate, and the joint of the arc diversion guide plate and the wall of the annular cooling groove is the highest point of the circumference of the wall of the annular cooling groove.

4. The integrated electric drive housing of claim 1 wherein: the oil collecting box includes:

the two sides of the box bottom of the oil collecting box extend upwards to form an oil inlet side wall and an oil outlet side wall of the oil collecting box; an oil inlet gap is formed between the oil inlet side wall and the inner wall of the annular flange, and an oil outlet gap is formed between the oil outlet side wall and the inner wall of the annular flange; an oil baffle plate is arranged in the oil collecting box and used for blocking an oil inlet gap and an oil outlet gap.

5. The integrated electric drive housing of claim 4 wherein: the oil collecting box bottom comprises two sections of bottom plates which are integrally formed into a V shape, the bottom plate on the oil inlet gap side is provided with an oil leakage hole, and the oil leakage hole is higher than the lowest part of the bottom plate.

6. An integrated electrically driven housing as claimed in claim 1, 4 or 5, wherein: the oil collecting box is positioned above the motor shaft hole and extends to the upper part of a first bearing hole of the speed reducer; the oil leakage hole at the bottom of the oil collecting box is communicated with the bearing lubricating and cooling oil duct of the first bearing hole.

7. The integrated electric drive housing of claim 1 wherein: an L-shaped oil guide plate is arranged between a first bearing hole of the speed reducer and a bearing limiting flange of a second bearing hole of the speed reducer, and splashed lubricating oil is respectively guided to the first bearing hole of the speed reducer and the second bearing hole of the speed reducer by the L-shaped oil guide plate.

8. The integrated electric drive housing of claim 7 wherein: the L-shaped oil guide plate is opposite to the oil inlet side wall of the oil collection box, splashed lubricating oil is blocked by the oil inlet side wall of the oil collection box and falls down, and the L-shaped oil guide plate guides the splashed lubricating oil to the first bearing hole of the speed reducer and the second bearing hole of the speed reducer respectively.

9. The integrated electric drive housing of claim 1 wherein: the top of one side of an annular flange of the speed reducer is provided with an exhaust hole, the inner wall of the annular flange at the side edge of the exhaust hole is provided with an oil baffle plate, the oil baffle plate extends to the lower part of the cavity from the top, the upper part of the oil baffle plate close to the side of the exhaust hole is provided with a first baffle plate inclining downwards, the side wall of the annular flange opposite to the oil baffle plate is provided with a second baffle plate inclining downwards, and the first baffle plate and the second baffle plate are overlapped and crossed up and down; the oil baffle plate, the top of the annular flange and the side wall of the annular flange form an exhaust channel.

10. An integrated electric drive assembly, characterized by: it comprises an integrated electric drive housing according to claims 1-9, on one side of which the components forming the motor are arranged; the other side of the shell is provided with a component forming a speed reducer, and an output shaft of the motor forms an input shaft of the speed reducer.

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