Cooling device and electric drive system

Abstract

The present invention discloses a cooling device, which includes an integrally formed electronic control motor housing. The electronic control motor housing includes an electronic control housing and a motor housing. The motor housing is a hollow cylindrical shape. The electronic control housing is arranged on one side in the axial direction of the motor housing. An electronic control cooling circuit is provided in the electronic control housing, and a motor cooling circuit is provided in the motor housing. The electronic control cooling circuit is arranged on the side surface of the electronic control housing adjacent to the motor housing, and the motor cooling circuit is arranged inside the circumferential surface of the motor housing. The electronic control cooling circuit is communicated with the motor cooling circuit. The present invention also discloses an electric drive system. The present invention improves the cooling efficiency of the dual motors, and in the cooling device, the electronic control housing and the motor housing are coaxially arranged, which can reduce the X-direction and Z-direction dimensions and realize the flat and miniaturized design of the electric drive system.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and particularly to a cooling device and an electric drive system. Background Art

[0002] The electric drive system of a new energy vehicle generally includes a motor, a reducer, and a motor controller, and a cooling device needs to be provided to cool the motor, the reducer, and the motor controller respectively. In some electric drive systems, the motor and the motor controller share a cooling device. However, this arrangement is not ideal for cooling a dual-motor system. After the coolant passes through the first motor and then flows into the other motor, the temperature of the coolant has risen, and the cooling effect on the other motor is poor. Moreover, the existing cooling device requires an external cooling pipeline to be arranged between the electric control housing and the motor housing to realize the transfer of the coolant, which has a complex structure, occupies a lot of space, has a high cost, and also has a low cooling efficiency.

[0003] Therefore, it is necessary to design a cooling device and an electric drive system that can improve the cooling effect. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a cooling device and an electric drive system that can improve the cooling effect.

[0005] The technical solution of the present invention provides a cooling device, including an integrally formed electric control motor housing, the electric control motor housing includes an electric control housing and a motor housing, the motor housing is a hollow cylindrical shape, the electric control housing is arranged on one side in the axial direction of the motor housing, an electric control cooling circuit is provided in the electric control housing, a motor cooling circuit is provided in the motor housing, the electric control cooling circuit is arranged on the side surface of the electric control housing adjacent to the motor housing, the motor cooling circuit is arranged inside the circumferential surface of the motor housing, and the electric control cooling circuit is communicated with the motor cooling circuit.

[0006] Further, the electric control housing includes a cover and a housing body, the housing body is integrally formed with the motor housing, the cover is detachably connected to the housing body, the housing body includes a bottom plate and a side enclosure plate, and the bottom plate is directly connected to one side of the motor housing;

[0007] The electric control cooling circuit includes a liquid inlet pipe, a cooling tank, and a liquid outlet pipe, the cooling tank is opened on the bottom plate, the liquid inlet pipe extends from the outside of the side enclosure plate into the inside of the bottom plate and is communicated with the cooling tank, and the liquid outlet pipe is communicated from the other side of the cooling tank through the inside of the bottom plate to the inside of the motor housing.

[0008] Further, the electronically controlled cooling circuit further includes a drain pipe disposed inside the bottom plate. One end of the drain pipe communicates with the cooling tank and is connected to the liquid outlet pipe, and the other end of the drain pipe extends out from the outer wall of the side wall panel.

[0009] Further, a power module is installed in the electronically controlled housing. A plurality of heat dissipation components are provided on one side surface of the power module. The heat dissipation components are inserted into the cooling tank, and the power module and the edge of the cooling tank are sealed by a sealing ring.

[0010] Further, a rear cover plate is further included. A rear opening is provided on the opposite side surface where the housing body is connected to the cover. The rear cover plate is used to close the rear opening.

[0011] Further, the housing body includes a partition plate. The partition plate divides the inner cavity of the housing body into a main cavity and a secondary cavity. The main cavity is located between the cover and the partition plate, and the secondary cavity is located between the rear cover plate and the partition plate. The main cavity is used to install the power module. The secondary cavity communicates with the inside of the motor housing. A plugging hole is provided on the partition plate, and the plugging terminal of the power module is installed into the plugging hole.

[0012] Further, the motor cooling circuit is a spiral cooling flow channel provided inside the motor housing.

[0013] Further, the spiral cooling flow channel includes a liquid inlet and a liquid outlet. The liquid inlet is directly connected to the electronically controlled cooling circuit, and the liquid outlet extends out from the motor housing.

[0014] The present invention further provides an electric drive system, including a motor, a motor controller, a reducer, a reduction housing, and two cooling devices as described in any one of the above. The cooling devices are symmetrically arranged on both sides of the reduction housing. The motor housing is directly connected to the reduction housing. The motor is installed in the motor housing, the motor controller is installed in the electronically controlled housing, and the reducer is installed in the reduction housing.

[0015] Further, the electronically controlled cooling circuits and the motor cooling circuits in the two cooling devices are symmetrically arranged.

[0016] After adopting the above technical solutions, the following beneficial effects are achieved:

[0017] In the present invention, two sets of cooling devices are symmetrically arranged to cool a set of motor and electronic control respectively, improving the cooling efficiency of the dual motors. And in the cooling device, the electronically controlled housing and the motor housing are coaxially arranged, which can reduce the X-direction and Z-direction dimensions and realize the flat and miniaturized design of the electric drive system. Description of the Drawings

[0018] Referring to the accompanying drawings, the disclosure of the present invention will become more readily understood. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the drawings:

[0019] Figure 1 is a perspective view of a cooling device in an embodiment of the present invention;

[0020] Figure 2 is an exploded view of a cooling device in an embodiment of the present invention;

[0021] Figure 3 is a perspective view of a cooling device with the cover omitted in an embodiment of the present invention;

[0022] Figure 4 is an exploded view of a cooling device and a power module in an embodiment of the present invention;

[0023] Figure 5 is a perspective view of a cooling device and a resolver stator in an embodiment of the present invention;

[0024] Figure 6 is a schematic diagram of an electric control cooling circuit and a motor cooling circuit in an embodiment of the present invention;

[0025] Figure 7 is a schematic diagram of an electric drive system in another embodiment of the present invention;

[0026] Figure 8 is a schematic diagram of an electric control cooling circuit and a motor cooling circuit of an electric drive system in another embodiment of the present invention;

[0027] Figure 9 is an exploded view of a speed reducer and a speed reduction housing in another embodiment of the present invention;

[0028] Figure 10 is of a speed reducer in another embodiment of the present invention Figure 1 ;

[0029] Figure 11 is of a speed reducer in another embodiment of the present invention Figure 2 ;

[0030] Figure 12 is a schematic diagram of a speed reducer and an oil injection assembly in another embodiment of the present invention;

[0031] Figure 13 is a schematic diagram of an oil injection assembly and a speed reduction housing in another embodiment of the present invention;

[0032] Figure 14 is Figure 13 a partial enlarged view of.

[0033] List of reference numerals:

[0034] Electric control motor housing 10:

[0035] Electric control housing 1: cover 11, housing body 12, rear cover plate 13, bottom plate 121, side wall plate 122, rear opening 123, partition plate 124, insertion hole 125, main cavity 12A, auxiliary cavity 12B;

[0036] Motor housing 2;

[0037] Electric control cooling circuit 3: inlet pipe 31, cooling tank 32, outlet pipe 33, drain pipe 34;

[0038] Motor cooling circuit 4: inlet port 41, outlet port 42;

[0039] Power module 5: heat sink 51;

[0040] Resolver stator 6;

[0041] Reduction housing 20: main housing 201, cover plate 202;

[0042] Reducer 8: input shaft system 81, intermediate shaft system 82, output shaft system 83, input gear 811, intermediate large gear 821, intermediate small gear 822, output gear 831;

[0043] Oil injection assembly 9: collection tank 91, drive gear 92, oil pump 93, delivery pipeline 94, oil nozzle 95, bearing oil nozzle 951, gear oil nozzle 952, bearing oil hole 9511, gear oil hole 9521. Specific embodiments

[0044] The following further illustrates the specific embodiments of the present invention with reference to the accompanying drawings.

[0045] It is easy to understand that according to the technical solution of the present invention, under the condition of not changing the essence of the present invention, there are various structural ways and implementation ways that can be mutually replaced by those of ordinary skill in the art. Therefore, the following specific embodiments and the accompanying drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction on the technical solution of the invention.

[0046] The orientation terms such as up, down, left, right, front, back, front side, back side, top, bottom, etc. mentioned or possibly mentioned in this specification are defined relative to the structures shown in the respective drawings, and they are relative concepts. Therefore, they may change accordingly according to their different positions and different usage states. So, these or other orientation terms should not be interpreted as restrictive terms.

[0047] In some embodiments of the present invention, such as Figure 1 and Figure 6As shown in the figure, the cooling device includes an integrally formed electronic control motor housing 10. The electronic control motor housing 10 includes an electronic control housing 1 and a motor housing 2. The motor housing 2 is a hollow cylindrical shape. The electronic control housing 1 is arranged on one side in the axial direction of the motor housing 2. An electronic control cooling circuit 3 is provided in the electronic control housing 1, and a motor cooling circuit 4 is provided in the motor housing 2. The electronic control cooling circuit 3 is arranged on one side surface of the electronic control housing 1 adjacent to the motor housing 2, and the motor cooling circuit 4 is arranged inside the circumferential surface of the motor housing 2. The electronic control cooling circuit 3 is communicated with the motor cooling circuit 4.

[0048] Specifically, as Figure 1 shown, Figure 1 For a set of cooling devices, the motor controller is installed in the electronic control housing 1, and a motor is installed in the motor housing 2. The motor controller is used to control the operation of the motor. The electronic control housing 1 and the motor housing 2 are integrally formed. The electronic control cooling circuit 3 and the motor cooling circuit 4 are respectively arranged inside the electronic control housing 1 and the motor housing 2 and are communicated with each other, realizing the cooling of the motor controller and the motor at the same time.

[0049] In this embodiment, the motor housing 2 is a hollow cylindrical shape. The electronic control housing 1 is arranged on one side in the axial direction of the motor housing 2. The axial direction of the motor housing 2 is along the Y direction (left - right direction) of the whole vehicle. This layout can reduce the space occupation in the X direction (front - back direction) and the Z direction (up - down direction), which is beneficial to realizing the flat and miniaturized design of the electric drive system.

[0050] In addition, in this embodiment, the electronic control cooling circuit 3 and the motor cooling circuit 4 are respectively arranged inside the electronic control housing 1 and the motor housing 2. The coolant directly flows from the inside of the electronic control housing 1 into the motor housing 2, eliminating the need to arrange external cooling pipelines, reducing space occupation, lowering costs, and improving cooling efficiency at the same time.

[0051] Furthermore, as Figure 2 and Figure 6 shown, the electronic control housing 1 includes a cover 11 and a housing body 12. The housing body 12 is integrally formed with the motor housing 2. The cover 11 is detachably connected to the housing body 12. The housing body 12 includes a bottom plate 121 and a side wall plate 122. The bottom plate 121 is directly connected to one side of the motor housing 2;

[0052] The electronic control cooling circuit 3 includes an inlet pipe 31, a cooling tank 32, and an outlet pipe 33. The cooling tank 32 is opened on the bottom plate 121. The inlet pipe 31 extends from the outside of the side wall plate 122 into the inside of the bottom plate 121 and is communicated with the cooling tank 32. The outlet pipe 33 is communicated from the other side of the cooling tank 32 through the inside of the bottom plate 121 to the inside of the motor housing 2.

[0053] Specifically, as Figure 2As shown, the electronic control housing 1 is a flat hollow housing. The housing body 12 is integrally formed with the motor housing 2. The bottom plate 121 of the housing body 12 is connected to one end face of the motor housing 2. The side wall plates 122 extend outward from the bottom plate 121. The cover 11 is connected to the edge of the side wall plates 122 by a plurality of bolts or screws. A hollow cavity is formed between the cover 11 and the bottom plate 121 for installing the motor controller.

[0054] One end of the liquid inlet pipe 31 of the electronic control cooling circuit 3 is located outside the side wall plates 122 for communicating with an external coolant source, and the other end passes through the inside of the bottom plate 121 and is connected to the cooling tank 32. The cooling tank 32 is a groove formed on the inner side surface of the bottom plate 121. Two liquid holes are formed in the cooling tank 32. One liquid hole is connected to the liquid inlet pipe 31, and the other liquid hole is connected to the liquid outlet pipe 33.

[0055] As Figure 6 shown, the liquid outlet pipe 33 passes through the inside of the bottom plate 121 from the other side of the cooling tank 32 and is connected to the motor cooling circuit 4 inside the motor housing 2.

[0056] During cooling, the coolant enters the cooling tank 32 through the liquid inlet pipe 31. The cooling tank 32 cools the power module 5 (see Figure 4 ), and then flows from the cooling tank 32 into the liquid outlet pipe 33, and finally flows from the liquid outlet pipe 33 into the motor cooling circuit 4 to continue cooling the motor.

[0057] This embodiment effectively utilizes the coolant, simplifies the layout of the cooling device, and reduces the cost.

[0058] Furthermore, as Figure 3 and Figure 6 shown, the electronic control cooling circuit 3 further includes a drain pipe 34. The drain pipe 34 is arranged inside the bottom plate 121. One end of the drain pipe 34 is connected to the cooling tank 32 and is connected to the liquid outlet pipe 33. The other end of the drain pipe 34 extends out from the outer wall of the side wall plates 122.

[0059] Specifically, as Figure 3 shown, one end of the drain pipe 34 is connected to the liquid hole at the bottom of the cooling tank 32, and the other end extends out from the outer wall of the side wall plates 122 for discharging the excess coolant.

[0060] As Figure 6 shown, the middle section of the drain pipe 34 is connected to one end of the liquid outlet pipe 33, and the other end of the liquid outlet pipe 33 is connected to the liquid inlet port 41 of the motor cooling circuit 4.

[0061] The coolant first flows from the cooling tank 32 into the drain pipe 34, and then flows from the drain pipe 34 into the liquid outlet pipe 33. The other end of the drain pipe 34 can be blocked or a valve can be installed. During cooling, the valve is closed; when it is necessary to discharge the excess coolant, the valve is opened.

[0062] It should be noted that Figure 6 The part between the inlet pipe 31 and the drain pipe 34 is not the cooling tank 32, but the shape of the coolant flowing into the cooling tank 32. The coolant is in the cooling tank 32 and cools around a plurality of protruding heat dissipation members 51.

[0063] Furthermore, as Figure 4 shown, a power module 5 is installed in the electric control housing 1. A plurality of heat dissipation members 51 are provided on one side surface of the power module 5. The heat dissipation members 51 are inserted into the cooling tank 32, and the edge of the power module 5 and the cooling tank 32 is sealed by a sealing ring.

[0064] Specifically, the power module 5 is part of the motor controller. Heat is generated when the power module 5 works. The electric control cooling circuit 3 is used to cool the power module 5. A plurality of protruding heat dissipation members 51 are provided on the side of the power module 5 facing the cooling tank 32. The heat dissipation members 51 are inserted into the cooling tank 32, and then the edge of the power module 5 and the cooling tank 32 is sealed by a sealing ring. In this way, when the coolant flows into the cooling tank 32, the coolant contacts the heat dissipation members 51 and takes away the heat of the heat dissipation members 51. Since the sealing ring reduces and seals the gap between the cooling tank 32 and the power module 5, the coolant will not flow into the hollow cavity of the electric control housing 1 and does not affect the motor controller.

[0065] Furthermore, as Figure 4 shown, it further includes a rear cover plate 13. A rear opening 123 is provided on the opposite side surface where the housing body 12 is connected to the cover 11. The rear cover plate 13 is used to close the rear opening 123.

[0066] As Figures 2 - 5 shown, the housing body 12 includes a partition plate 124. The partition plate 124 divides the inner cavity of the housing body 12 into a main cavity 12A and a secondary cavity 12B. The main cavity 12A is located between the cover 11 and the partition plate 124, and the secondary cavity 12B is located between the rear cover plate 13 and the partition plate 124. The main cavity 12A is used to install the power module 5. The secondary cavity 12B is communicated with the inside of the motor housing 2. A plug hole 125 is provided on the partition plate 124, and the plug terminals of the power module 5 are installed in the plug hole 125.

[0067] Specifically, the main cavity 12A is used to install the main components of the motor controller, including the power module 5. Two plug holes 125 are provided on the partition plate 124. One of the plug holes 125 is for installing the electric control motor connection copper bar, and the other plug hole 125 is for installing the plug terminals of the power module 5.

[0068] The secondary cavity 12B is located on the side facing the motor housing 2, and the secondary cavity 12B is communicated with the inside of the motor housing 2.

[0069] As Figure 5As shown, a resolver stator 6 is installed inside the motor housing 2. The wire harness of the resolver stator 6 penetrates into the secondary cavity 12B and is electrically connected to the plug-in terminal. After the flexible cable of the motor stator passes through the motor housing 2 and enters the secondary cavity 12B, it is connected to the copper connection bar of the electric control motor.

[0070] The settings of the secondary cavity 12B and the rear opening 123 facilitate the connection of the plug-in terminal and the wire harness, and also facilitate later maintenance. After the wire harness connection is completed, the rear cover plate 13 is bolted to the rear opening 123.

[0071] In this embodiment, through the settings of the internal structures of the electric control housing 1 and the motor housing 2, the electrical connection between the motor and the motor controller is realized. The structure of the entire electric drive system is more compact, the layout is reasonable, and the occupied space is smaller.

[0072] Further, as Figure 6 shown, the motor cooling circuit 4 is a spiral cooling flow channel provided inside the motor housing 2. The spiral cooling flow channel winds along the circumferential direction of the motor housing 2, and can cool the motor in all directions.

[0073] Further, as Figure 6 shown, the spiral cooling flow channel includes a liquid inlet 41 and a liquid outlet 42. The liquid inlet 41 is directly connected to the electric control cooling circuit 3, and the liquid outlet 42 extends out of the motor housing 2.

[0074] Specifically, the liquid inlet 41 is directly communicated with the liquid outlet pipe 33, and the liquid outlet 42 extends out of the motor housing 2 and is used to connect to an external cooling circulation pipeline. After the cooling circulation pipeline cools the coolant again, it flows into the cooling device again from the liquid inlet pipe 31.

[0075] In other embodiments of the present invention, as Figures 7 - 8 shown, the electric drive system includes a motor, a motor controller, a reducer 8, a reduction housing 20, and two cooling devices in any one of the above embodiments. The cooling devices are symmetrically arranged on both sides of the reduction housing 20. The motor housing 2 is directly connected to the reduction housing 20. The motor is installed in the motor housing 2, the motor controller is installed in the electric control housing 1, and the reducer is installed in the reduction housing 20.

[0076] Specifically, the electric drive system includes two sets of cooling devices, which respectively cool two motors and two motor controllers. The two sets of cooling devices are not connected and are independently cooled respectively, improving the cooling efficiency. Moreover, the electric control housings 1 of the two sets of cooling devices are both arranged in the axial direction of the motor housing 2, reducing the space occupied in the X direction (front-back direction) and Z direction (up-down direction) of the whole vehicle, which is beneficial to the flat and miniaturized design of the electric drive system.

[0077] Further, as Figure 8As shown, the electric control cooling circuit 3 and the motor cooling circuit 4 in the two cooling devices are symmetrically arranged. Among them, the motor cooling circuit 4 is arranged on the inner side, and the electric control cooling circuit 3 is arranged on the outer side.

[0078] Further, as Figure 9 shown, the reduction housing 20 is an integral body, and two sets of speed reducers 8 are integrated inside the reduction housing 20, making the overall structure compact and occupying a small space. The reduction housing 20 includes a main housing 201 and a cover plate 202. The main housing 201 includes two independent first installation cavities and second installation cavities, which respectively install two sets of speed reducers 8. Two cover plates 202 are used to close the main housing 201, and the cover plate 202 is also connected to the motor housing 2.

[0079] In this embodiment, the electric drive system includes two sets of motor controllers - motors - speed reducers. The two sets of devices operate independently and respectively input power to a wheel axle. Since one motor controller only controls one motor, the control logic strategy is simplified and the design cost is reduced.

[0080] Further, as Figure 10 shown, the speed reducer 8 includes an input shaft system 81, an intermediate shaft system 82, and an output shaft system 83. The input shaft system 81 is used to connect with the motor, and the output shaft system 83 is used to connect with the wheel axle.

[0081] As Figure 11 shown, the input shaft system 81 includes an input gear 811, the intermediate shaft system 82 includes an intermediate large gear 821 and an intermediate small gear 822. The intermediate large gear 821 and the intermediate small gear 822 are coaxially and fixedly connected. The input gear 811 meshes with the intermediate large gear 821. The output shaft system 83 includes an output gear 831, and the output gear 831 meshes with the intermediate small gear 822.

[0082] Specifically, the power of the motor is transmitted to the input shaft system 81, the input shaft system 81 is then transmitted to the intermediate shaft system 82, then transmitted from the intermediate shaft system 82 to the output shaft system 83, and finally transmitted from the output shaft system 83 to the wheel axle to drive the rotation of the wheel.

[0083] During transmission, the input gear 811 drives the intermediate large gear 821 to rotate, the intermediate large gear 821 drives the intermediate small gear 822 to rotate, and the intermediate small gear 822 drives the output gear 831 to rotate.

[0084] Since the diameter of the input gear 811 is smaller than the diameter of the intermediate large gear 821, a first speed change occurs during the transmission process. The rotational speeds of the intermediate large gear 821 and the intermediate small gear 822 are the same. The diameter of the intermediate small gear 822 is smaller than the diameter of the output gear 831, and a second speed change occurs during the transmission process. Through the transmission of the speed reducer 8, the speed is changed.

[0085] Further, asFigure 9 and Figures 12 - 13 As shown in Figures 12 - 13 , an oil injection assembly 9 is provided in the deceleration housing 20. The oil injection assembly 9 is installed in the first installation cavity and the second installation cavity, and is used to convey the oil at the bottom of the first installation cavity and the second installation cavity to the intermediate shafting 82 and the input shafting 81.

[0086] As Figure 13 shown in Figure 13 , one end of the oil injection assembly 9 is installed at the bottom of the main housing 201, and the other end extends to the positions of the input shafting 81 and the intermediate shafting 82. The oil injection assembly 9 can convey the oil at the bottom of the first installation cavity and the second installation cavity to the intermediate shafting 82 and the input shafting 81, and spray oil to cool the input shafting 81 and the intermediate shafting 82.

[0087] Since the diameter of the output gear 831 of the output shafting 83 is relatively large, the lower half of the output gear 831 is immersed in the oil. Therefore, when the output gear 831 rotates, it can drive the oil and splash it upward, playing a cooling role. However, the input shafting 81 and the intermediate shafting 82 are at a certain distance from the bottom of the installation cavity, and the direct splashing of the oil has a poor cooling effect. Therefore, it is necessary to drive the oil to the intermediate shafting 82 and the input shafting 81 through the oil injection assembly 9 to achieve a better cooling effect.

[0088] Furthermore, as Figure 12 shown in Figure 12 , the oil injection assembly 9 includes a collection tank 91, a driving gear 92, an oil pump 93, a delivery pipe 94, and an oil nozzle 95. The collection tank 91 is located at the bottom of the first installation cavity and the second installation cavity. The driving gear 92 meshes with the output gear 831, and the driving gear 92 is in transmission connection with the oil pump 93. The delivery pipe 94 connects the collection tank 91, the oil pump 93, and the oil nozzle 95.

[0089] Specifically, the collection tank 91 is located below the output gear 831 and at the bottom of the first installation cavity and the second installation cavity. The driving gear 92 is in transmission connection with the oil pump 93 and meshes with the output gear 831. When the output gear 831 rotates, the output gear 831 drives the driving gear 92 to rotate, and the driving gear 92 drives the oil pump 93 to work. The oil pump 93 pumps the oil in the collection tank 91 into the delivery pipe 94, and finally sprays it out from the oil nozzle 95. The oil nozzle 95 leads to the input shafting 81 and the intermediate shafting 82.

[0090] When the driving gear 92 rotates, it can also stir the oil at the bottom and drive the oil to the intermediate shafting 82 above.

[0091] Furthermore, as Figures 12 - 13 shown in Figures 12 - 13 , the oil nozzle 95 includes a bearing oil nozzle 951 and a gear oil nozzle 952;

[0092] The bearing oil nozzle 951 is arranged in the axial direction. The middle section of the bearing oil nozzle 951 is directly connected to the conveying pipeline 94. Both ends of the bearing oil nozzle 951 extend above the input bearings of the input shaft system 81 respectively.

[0093] The gear oil nozzle 952 is perpendicular to the bearing oil nozzle 951 and extends from the middle section of the bearing oil nozzle 951. The gear oil nozzle 952 extends above the intermediate large gear 821.

[0094] Specifically, one bearing oil hole 9511 is provided at each end of the bearing oil nozzle 951. The bearing oil hole 9511 sprays oil above the input bearings of the input shaft system 81 to cool the input bearings. The gear oil nozzle 952 is provided with a gear oil hole 9521. The gear oil hole 9521 sprays oil towards the intermediate large gear 821, and the oil can flow from the intermediate large gear 821 to the input gear 811, so as to cool the intermediate large gear 821 and the input gear 811.

[0095] In the present invention, two sets of cooling devices are symmetrically arranged to cool a set of motor and electronic control respectively, improving the cooling efficiency of the dual motors; and in the cooling devices, the electronic control housing and the motor housing are coaxially arranged, which can reduce the dimensions in the X and Z directions and realize the flat and miniaturized design of the electric drive system. Moreover, the electronic control cooling circuit and the motor cooling circuit are respectively arranged inside the electronic control housing and the motor housing. The coolant directly flows from the inside of the electronic control housing into the motor housing, without the need to arrange external cooling pipelines, reducing the space occupation, lowering the cost, and at the same time improving the cooling efficiency.

[0096] The above are only the principles and preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, based on the principle of the present invention, several other variants can also be made, which should also be regarded as the protection scope of the present invention.

Claims

1. A cooling device, characterized in that: The electric control motor housing includes an electric control housing and a motor housing, the motor housing is a hollow cylindrical shape, the electric control housing is arranged on one side of the axial direction of the motor housing, the electric control housing is provided with an electric control cooling circuit, the motor housing is provided with a motor cooling circuit, the electric control cooling circuit is arranged on a side of the electric control housing adjacent to the motor housing, the motor cooling circuit is arranged inside the circumferential surface of the motor housing, and the electric control cooling circuit is communicated with the motor cooling circuit; The electric control housing comprises a cover and a housing body, the housing body is integrally formed with the motor housing, the cover is detachably connected to the housing body, the housing body comprises a bottom plate and a side panel, the bottom plate is directly connected to one side of the motor housing, and a power module is installed in the electric control housing; It also includes a rear cover plate, a rear opening is provided on the side opposite to the connection between the shell body and the cover, and the rear cover plate is used to close the rear opening; The shell body comprises a partition, and the partition divides the inner cavity of the shell body into a main cavity and a secondary cavity, the main cavity is located between the cover and the partition, and the secondary cavity is located between the rear cover and the partition, the main cavity is used to install the power module, and the secondary cavity is radially connected to the interior of the motor housing, and two plug holes are provided on the partition, and the plug terminal of the power module is installed in one of the plug holes, and the other plug hole is connected to the copper busbar for connecting the power control motor; A resolver stator is installed inside the motor housing, and the wiring harness of the resolver stator radially penetrates into the auxiliary cavity and is electrically connected to the plug-in terminal of the power module; the flexible cable of the motor stator radially penetrates through the motor housing into the auxiliary cavity and is connected to the copper busbar connecting the electronically controlled motor.

2. The cooling device according to claim 1, characterized in that: The electronically controlled cooling circuit includes a liquid inlet pipe, a cooling groove and a liquid outlet pipe. The cooling groove is opened on the bottom plate. The liquid inlet pipe extends from the outside of the side panel into the inside of the bottom plate and is connected with the cooling groove. The liquid outlet pipe is connected to the inside of the motor housing through the inside of the bottom plate from the other side of the cooling groove.

3. The cooling device according to claim 2, characterized in that: The electronically controlled cooling circuit also includes a drain pipe, which is arranged inside the bottom plate. One end of the drain pipe is connected to the cooling tank and the liquid outlet pipe, and the other end of the drain pipe extends from the outer wall of the side panel.

4. The cooling device according to claim 2, characterized in that: A plurality of heat sinks are disposed on one side of the power module. The heat sinks are inserted into the cooling grooves. The power module and the edges of the cooling grooves are sealed by a sealing ring.

5. The cooling device according to claim 1, characterized in that: The motor cooling circuit is a spiral cooling channel arranged inside the motor housing.

6. The cooling device according to claim 5, characterized in that: The spiral cooling channel comprises a liquid inlet and a liquid outlet, wherein the liquid inlet is directly connected to the electronically controlled cooling circuit, and the liquid outlet extends from the motor housing.

7. An electric drive system, characterized in that: It comprises a motor, a motor controller, a reducer, a reduction housing and two cooling devices according to any one of claims 1 to 6, wherein the cooling devices are symmetrically arranged on both sides of the reduction housing, the motor housing is directly connected to the reduction housing, the motor is installed in the motor housing, the motor controller is installed in the electric control housing, and the reducer is installed in the reduction housing.

8. The electric drive system according to claim 7, characterized in that: The electronically controlled cooling circuit and the motor cooling circuit in the two cooling devices are arranged symmetrically.

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