Dual-motor distributed driving device and vehicle

Abstract

According to the dual-motor distributed driving device and the vehicle, the electric drive and electric control shell of the shell assembly of the dual-motor distributed driving device is integrally formed, so that a screw connecting structure between the two motors is reduced, and the size of the dual-motor distributed driving device is further reduced. Moreover, the electric-drive and electric-control shell is integrally formed, and an oil cooling channel and a water cooling channel of the cooling assembly are arranged in the electric-drive and electric-control shell and can communicate with a first motor mounting cavity, a second motor mounting cavity, a first speed reducer mounting cavity and a second speed reducer mounting cavity; a pipeline for connecting an oil cooling channel and a water cooling channel does not need to be arranged outside the shell assembly, so that the dual-motor distributed driving device is more compact in structure and smaller in size.

Description

Technical Field

[0001] The utility model relates to the field of vehicles, and mainly relates to a dual-motor distributed driving device and a vehicle. Background Art

[0002] In the existing distributed electric drive system, two motor housings are fixed together through screw holes, so that the distributed electric drive system is an integrated structure. However, the existing distributed electric drive system has a low degree of integration and a large volume. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a small-sized dual-motor distributed drive device and a vehicle.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A dual-motor distributed drive device includes a housing component and a cooling component, wherein the housing component includes an electric drive and electric control housing, a first middle plate, a second middle plate, a first end cover and a second end cover, wherein the electric drive and electric control housing is integrally formed, and a first motor mounting cavity, a second motor mounting cavity and a controller mounting cavity are provided on the electric drive and electric control housing, wherein the first motor mounting cavity and the second motor mounting cavity are coaxially arranged, and the controller mounting cavity is arranged on the same radial side of the first motor mounting cavity and the second motor mounting cavity, the first middle plate is arranged at the opening end of the first motor mounting cavity, the first end cover is fixed on the first middle plate, a first reducer mounting cavity is formed between the first end cover and the first middle plate, and the second middle plate is arranged At the open end of the second motor installation cavity, the second end cover is fixed on the second middle plate, and a second reducer installation cavity is formed between the second end cover and the second middle plate; the cooling assembly includes an oil cooling channel, a water cooling channel, an oil pump and a radiator, the oil cooling channel and the water cooling channel are arranged inside the electric drive and electric control housing, the oil cooling channel is communicated with the first motor installation cavity, the second motor installation cavity, the first reducer installation cavity and the second reducer installation cavity, the water cooling channel is communicated with the controller installation cavity, the oil pump and the radiator are fixed on the electric drive and electric control housing, and the radiator is communicated with the oil cooling channel and the water cooling channel, and the oil pump is connected in series to the oil cooling channel. By integrally forming the electric drive and electric control housing, and arranging the oil cooling channel and the water cooling channel inside the electric drive and electric control housing, it is not necessary to arrange pipelines connecting the oil cooling channel and the water cooling channel outside the housing assembly, thereby making the structure of the dual-motor distributed drive device more compact and smaller in size.

[0006] In some schemes of the present application, the oil cooling channel includes an oil storage chamber, an oil inlet channel, an oil outlet channel and a diverter oil channel. The oil storage chamber, the oil inlet channel, the oil outlet channel and the diverter oil channel are opened in the electric drive and electronic control housing. The oil storage chamber is located at the bottom of the electric drive and electronic control housing. One end of the oil inlet channel is connected to the oil storage chamber, and the other end is connected to the oil inlet end of the oil pump. One end of the oil outlet channel is connected to the oil outlet end of the oil pump, and the other end is connected to the oil inlet end of the radiator. One end of the diverter oil channel is connected to the oil outlet end of the radiator, and the other end is connected to the first motor mounting chamber, the second motor mounting chamber, the first reducer mounting chamber and the second reducer mounting chamber. The first motor mounting chamber, the second motor mounting chamber, the first reducer mounting chamber and the second reducer mounting chamber are connected to the oil storage chamber.

[0007] In some schemes of the present application, the electric drive and electric control housing has a second partition, and the second partition is arranged between the first motor installation cavity and the second motor installation cavity; the first motor installation cavity and the second motor installation cavity are both equipped with motors, and the motor includes a rotating shaft, and the rotating shaft is provided with a first center hole, and the diversion oil channel includes a main channel and a diversion channel, and the main channel is arranged on the second partition, and one end of the main channel is connected to the oil outlet end of the radiator, and the other end is connected to the first center hole; the diversion channel is arranged on the outside of the motor, and one end of the diversion channel is connected to the main channel, and the other end is connected to the first reducer installation cavity and the second reducer installation cavity. The diversion oil channel includes a main channel and a diversion channel, and the main channel is arranged on the second partition, so that the path of the diversion oil channel is short and the oil distribution between the two motors and the two reducer installation cavities is uniform.

[0008] In some solutions of the present application, the flow branch is provided with an oil spray hole facing the circumferential outer surface of the motor, thereby increasing the contact area between the cooling oil and the motor, thereby improving the cooling effect and cooling uniformity.

[0009] In some schemes of the present application, the first center hole is arranged along the axial direction of the rotating shaft, and the rotating shaft is also provided with a plurality of first through holes, and the plurality of first through holes are arranged at intervals along the axial direction of the rotating shaft, and the first through holes connect the first center hole and the circumferential outer surface of the rotating shaft; at least one of the first through holes is located in the first motor mounting cavity, at least one of the first through holes is located in the second motor mounting cavity, at least one of the first through holes is located in the first reducer mounting cavity, and at least one of the first through holes is located in the second reducer mounting cavity. By providing a plurality of first through holes on the rotating shaft, the first through holes connect the first motor mounting cavity, the second motor mounting cavity, the first reducer mounting cavity and the second reducer mounting cavity, so that the first center hole and the first through holes form an oil channel parallel to the branch channel, and the positions of the first through holes are different, so that the cooling oil is distributed more evenly.

[0010] In some schemes of the present application, planetary reducers are arranged in both the first reducer mounting cavity and the second reducer mounting cavity; the planetary reducer comprises a sun gear, a planet carrier, a planet gear, a ring gear and an output shaft, the sun gear is connected to the rotating shaft, the ring gear is arranged on the circumferential outer side of the sun gear, the planet gear is arranged between the sun gear and the ring gear, and meshes with both the sun gear and the ring gear, a needle roller is arranged on the planet carrier, the needle roller is rotatably connected to the planet gear, and the output shaft is fixedly connected to the planet carrier; a second center hole and a second through hole are arranged on the needle roller, the second center hole is arranged along the axial direction of the needle roller and is connected to one end face of the needle roller, and the second through hole is connected to the second center hole and the circumferential outer surface of the needle roller; the ring gear arranged in the first reducer mounting cavity is a first ring gear, the first ring gear is connected to the first end cover, and the ring gear arranged in the second reducer mounting cavity is a second ring gear, the second ring gear is connected to the second end cover. The planetary reduction mechanism is used as the reduction mechanism, which can reduce the volume, and the needle roller is provided with a second center hole and a second through hole, so that the coolant at each shaft and gear of the reduction mechanism is more uniform.

[0011] In some embodiments of the present application, the planetary gear includes a first gear and a second gear, and the first gear is fixedly connected to the second gear, the first gear is meshed with the sun gear, the second gear is meshed with the ring gear, and the diameter of the first gear is larger than the diameter of the second gear, so that the planetary reducer forms a two-stage reduction mechanism, and the envelope volume is smaller. The second through hole is arranged between the first gear and the second gear; an oil guide member is arranged on the planetary carrier, the oil inlet of the oil guide member is close to the first through hole, and the oil outlet of the oil guide member is connected to the second center hole, so that the coolant is more evenly distributed.

[0012] In some schemes of the present application, the motor further includes a rotor and a stator, the rotor is fixed on the rotating shaft, the stator is arranged on the circumferential outer side of the rotor and connected to the electric drive and electric control housing, and the axial length of the rotor is less than the axial length of the stator; the rotor of the motor arranged in the first motor installation cavity is a first rotor, a first space is formed between the first intermediate plate and the first rotor, and the rotor of the motor arranged in the second motor installation cavity is a second rotor, a second space is formed between the second intermediate plate and the second rotor; the dual-motor distributed drive device further includes a first rotation angle sensor and a second rotation angle sensor, the first rotation angle sensor is arranged in the first space and connected to the first intermediate plate, and the second rotation angle sensor is arranged in the second space and connected to the second intermediate plate. The space between the stator and the rotor is fully utilized to install the rotation angle sensor, thereby reducing the axial length of the dual-motor distributed drive device.

[0013] In some schemes of the present application, a controller is installed in the controller installation cavity; the water cooling channel includes a water inlet channel and a water outlet channel, and the water inlet channel and the water outlet channel are both arranged on the side wall of the electric drive and electric control housing, one end of the water inlet channel is connected to the outer surface of the electric drive and electric control housing, and is used to be connected to a cooling water supply device, and the other end of the water inlet channel is connected to the water inlet end of the controller, one end of the water outlet channel is connected to the water outlet end of the controller, and the other end is connected to the water inlet end of the radiator.

[0014] In some solutions of the present application, the electric drive and electric control housing has a first partition, the first partition is arranged between the first motor installation cavity, the second motor installation cavity and the controller installation cavity, the oil outlet channel, the water inlet channel and the water outlet channel are arranged at intervals on the first partition, and the radiator is arranged above the first partition. By arranging the oil outlet channel, the water inlet channel and the water outlet channel at intervals on the first partition, and arranging the radiator above the first partition, the channel path is shortened and the structure is simpler.

[0015] A vehicle comprises a vehicle body, a wheel end and the dual-motor distributed drive device, wherein the dual-motor distributed drive device is fixed on the vehicle body, and the wheel end is connected to the output shaft of the dual-motor distributed drive device.

[0016] Beneficial effect: In the dual-motor distributed drive device of the present application, the electric drive and electric control housing of the housing assembly is integrally formed, so that the screw connection structure between the two motors is reduced, thereby reducing the volume of the dual-motor distributed drive device. Moreover, through the integral formation of the electric drive and electric control housing, the oil cooling channel and the water cooling channel of the cooling assembly are arranged inside the electric drive and electric control housing, and can be connected to the first motor installation cavity, the second motor installation cavity, the first reducer installation cavity and the second reducer installation cavity, so that there is no need to arrange the connecting oil cooling channel and water cooling channel pipeline outside the housing assembly, thereby making the dual-motor distributed drive device more compact and smaller in size. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the main structure of the dual-motor distributed drive device.

[0018] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure at AA.

[0019] Figure 3 It is a right view structural schematic diagram of a dual-motor distributed drive device.

[0020] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure at BB.

[0021] Figure 5 It is a schematic diagram of the connection structure between the motor, planetary reducer and housing assembly.

[0022] Figure 6 yes Figure 5 A partial enlargement of point C.

[0023] Figure 7 It is a structural schematic diagram of the electric drive and electronic control housing.

[0024] Figure 8 It is a schematic diagram of the structure of the cooling assembly.

[0025] Main component symbol description: 1-housing assembly; 11-electric drive and electric control housing; 111-first motor installation cavity; 112-second motor installation cavity; 113-controller installation cavity; 114-first partition; 115-second partition; 12-first middle plate; 13-second middle plate; 14-first end cover; 141-first reducer installation cavity; 15-second end cover; 151-second reducer installation cavity; 2-cooling assembly; 21-oil cooling channel; 211-oil storage cavity; 212-oil inlet channel; 213-oil outlet channel; 214-diverter oil channel; 2141-main channel; 2142-diverter channel; 22-water cooling channel; 221-water inlet channel; 2 22-water outlet channel; 23-oil pump; 24-radiator; 3-motor; 31-rotating shaft; 311-first center hole; 312-first through hole; 32-rotor; 33-stator; 34-first motor; 35-second motor; 4-planetary reducer; 41-sun gear; 42-planet carrier; 421-needle roller; 422-second center hole; 423-second through hole; 43-planetary gear; 431-first gear; 432-second gear; 44-gear ring; 45-output shaft; 46-oil guide; 47-first planetary reducer; 48-second planetary reducer; 51-first rotation angle sensor; 52-second rotation angle sensor; 6-controller. DETAILED DESCRIPTION

[0026] The utility model provides a dual-motor distributed drive device and a vehicle. In order to make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the protection scope of the utility model.

[0027] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "inside", "outside", etc., indicating orientations or positional relationships, are 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] A vehicle comprises a vehicle body, wheel ends and a dual-motor distributed drive device, wherein the dual-motor distributed drive device is fixed to the vehicle body, and the wheel ends are connected to the output shafts of the dual-motor distributed drive device, so that the dual-motor distributed drive device can drive the wheel ends to rotate, thereby realizing the movement of the vehicle.

[0030] See also Figure 1-Figure 4 as well as Figure 8 The dual-motor distributed drive device includes a housing assembly 1, a first motor 34, a second motor 35, a first planetary reducer 47, a second planetary reducer 48, a controller 6 and a cooling assembly 2. The first motor 34, the second motor 35, the first planetary reducer 47 and the second planetary reducer 48 are all arranged in the housing assembly 1, and the first planetary reducer 47, the first motor 34, the second motor 35 and the second planetary reducer 48 are coaxially arranged to form a dual-motor coaxial arrangement & planetary transmission system.

[0031] Among them, the first planetary reducer 47 is arranged on the side of the first motor 34 away from the second motor 35, and is connected to the first motor 34 in a transmission manner, so that the power output by the first motor 34 is transmitted to the wheel end after being decelerated by the first planetary reducer 47, thereby reducing the torque demand of the first motor 34, so that the first motor 34 can be designed to be smaller, so as to reduce the volume of the dual-motor distributed drive device, or the first motor 34 is set to be a motor that can output a higher speed, so that the output speed of the dual-motor distributed drive device covers a wider range. Similarly, the second planetary reducer 48 is arranged on the side of the second motor 35 away from the first motor 34, and is connected to the second motor 35 in a transmission manner, so that the power output by the second motor 35 is transmitted to the wheel end after being decelerated by the second planetary reducer 48, thereby reducing the torque demand of the second motor 35, so that the second motor 35 can be designed to be smaller, so as to reduce the volume of the dual-motor distributed drive device, or the second motor 35 is set to be a motor that can output a higher speed, so that the output speed of the dual-motor distributed drive device covers a wider range.

[0032] The torque of the first motor 34 of the present application is decelerated and increased through the first planetary reducer 47, and the torque of the second motor 35 is decelerated and increased through the second planetary reducer 48. Compared with the reducer with parallel shafts, the radial and axial spaces can be effectively optimized, which is more conducive to optimizing the space for the whole vehicle. At the same time, the high integration of the first motor 34, the second motor 35, the first planetary reducer 47, the second planetary reducer 48, the controller 6 and the accessory system is conducive to improving the structural compactness of the distributed assembly and improving the power density.

[0033] The controller 6 is arranged on the same radial side of the first motor 34 and the second motor 35, and the controller 6 is electrically connected to the first motor 34 and the second motor 35 at the same time. Compared with the controllers 6 of the two motors 3 being installed separately, the controller 6 of the present application only needs to be installed once. The controller 6 is integrated inside the housing assembly 1, and the housing assembly 1 itself can meet the requirements of IP grade and strength support. Therefore, there is no need to set up a separate housing for the controller 6, which saves the cost of the controller 6 housing, reduces the weight, and improves the integration, making the stiffness mode of the whole machine better.

[0034] Preferably, the controller 6 is provided with connection ports on both sides along the axis of the first motor 34, and the connection ports on both sides are respectively opposite to the connection terminals of the first motor 34 and the connection terminals of the second motor 35, thereby reducing the connection distance between the first motor 34 and the controller 6 and between the second motor 35 and the controller 6, and can reduce the use of conductive metal, thereby reducing costs.

[0035] In one embodiment, the axial direction of the first motor 34 and the second motor 35 is the width direction of the vehicle, and the controller 6 is arranged on one side of the first motor 34 and the second motor 35 along the length direction of the vehicle, thereby reducing the height of the dual-motor distributed drive device and making it easier to arrange the dual-motor distributed drive device on the vehicle.

[0036] See also Figure 1 , Figure 4 as well as Figure 7 The housing assembly 1 includes an electric drive and electric control housing 11, a first middle plate 12, a second middle plate 13, a first end cover 14 and a second end cover 15. A first motor installation cavity 111, a second motor installation cavity 112 and a controller installation cavity 113 are arranged on the electric drive and electric control housing 11. The first motor installation cavity 111 and the second motor installation cavity 112 are arranged coaxially, and the controller installation cavity 113 is arranged on the same radial side of the first motor installation cavity 111 and the second motor installation cavity 112. The first motor 34 is installed in the first motor installation cavity 111, the second motor 35 is installed in the second motor installation cavity 112, and the controller 6 is installed in the controller installation cavity 113. By deeply integrating the two motors 3 into one electric drive and electric control housing 11, and integrating the controller 6 into the electric drive and electric control housing 11, the integration of the assembly is improved, and the connection process of the two motors 3 is optimized.

[0037] The first middle plate 12 and the second middle plate 13 are both fixed on the electric drive and electric control housing 11. The first middle plate 12 is arranged at the open end of the first motor installation cavity 111, so that the first middle plate 12 and the electric drive and electric control housing 11 together form a closed first motor installation cavity 111. The first end cover 14 is fixed on the first middle plate 12, and together with the first middle plate 12, it forms a first reducer installation cavity 141, and the first planetary reducer 47 is installed in the first reducer installation cavity 141. The rotating shaft 31 of the first motor 34 passes through the first middle plate 12 and extends to the inside of the first reducer installation cavity 141, and is drivingly connected to the first planetary reducer 47 installed in the first reducer installation cavity 141.

[0038] Similarly, the second middle plate 13 is arranged at the open end of the second motor installation cavity 112, so that the second middle plate 13 and the electric drive and electric control housing 11 together form a closed second motor installation cavity 112, the second end cover 15 is fixed on the second middle plate 13, and together with the second middle plate 13, it forms a second reducer installation cavity 151, and the second planetary reducer 48 is installed in the second reducer installation cavity 151. The rotating shaft 31 of the second motor 35 passes through the second middle plate 13 and extends to the inside of the second reducer installation cavity 151, and is drivingly connected to the second planetary reducer 48 installed in the second reducer installation cavity 151.

[0039] See also Figure 2 , Figure 4 , Figure 5 , Figure 7 as well as Figure 8 The cooling assembly 2 includes an oil cooling channel 21, a water cooling channel 22, an oil pump 23 and a radiator 24. The oil cooling channel 21 is connected to the first motor installation cavity 111, the second motor installation cavity 112, the first reducer installation cavity 141 and the second reducer installation cavity 151. The oil pump 23 and the radiator 24 are fixed on the electric drive and electric control housing 11. The oil cooling channel 21 is connected to the radiator 24. The oil pump 23 is connected in series to the oil cooling channel 21, so that the cooling oil flows through the oil pump 23, the radiator 24 and the oil cooling channel 21 to the first motor installation cavity 111, the second motor installation cavity 112, the first reducer installation cavity 141 and the second reducer installation cavity 151 to cool the first motor 34, the second motor 35, the first planetary reducer 47 and the second planetary reducer 48. The water cooling channel 22 is connected to the controller 6 and is connected to the radiator 24, so that the cooling water can pass through the controller 6 and the radiator 24 in sequence to achieve cooling of the controller 6 and the radiator 24.

[0040] Among them, under normal working conditions of the dual-motor distributed drive device, the operating temperature of the controller 6 is lower than the operating temperature of the first motor 34 and the second motor 35, so the temperature of the cooling oil will be higher than the temperature of the cooling water, and the water inlet end of the water-cooling channel 22 and the water outlet end of the radiator 24 are both connected to the cooling water supply device and form a circulation. When the cooling water flows through the radiator 24, it exchanges heat with the cooling oil flowing through the radiator 24 to achieve cooling of the cooling oil.

[0041] In special cases, such as low temperature environments, when the cooling water is heated to a set operating temperature, the temperature of the cooling water is higher than the temperature of the cooling oil, and the cooling water heats the cooling oil, so that the first motor 34 and the second motor 35 quickly reach the optimal operating temperature. When the first motor 34 and the second motor 35 operate at the optimal operating temperature, energy consumption can be reduced and performance can be improved.

[0042] In the above, the electric drive and electronic control housing 11 is integrally formed, so that the oil cooling channel 21 and the water cooling channel 22 can be distributed inside the electric drive and electronic control housing 11, and the oil pump 23 is directly connected to the oil cooling channel 21, and the radiator 24 is directly connected to the oil cooling channel 21 and the water cooling channel 22, so that there is no need to set pipes outside the housing assembly 1 to guide the cooling oil and cooling water to each cooling point, and the first motor 34 and the second motor 35 share a set of cooling components 2, thereby making the structure of the dual-motor distributed drive device more concise, highly integrated, and smaller in size.

[0043] In one embodiment, the first planetary reducer 47 and the second planetary reducer 48 are respectively connected to different wheel ends to form a distributed pure electric drive structure.

[0044] In another embodiment, the dual-motor distributed drive device may further include an engine to form an extended-range power device or a hybrid power device, wherein the extended-range power device refers to a power device in which the engine can drive one of the motors 3 to generate electricity, and the other motor 3 is used to drive the two wheel ends to rotate; the hybrid power device refers to a power device in which the engine can output power together with one or both of the two motors 3 to drive the two wheel ends to rotate.

[0045] In other embodiments, a dual-motor distributed drive device is used to drive the front wheels of the vehicle, and an additional drive motor 3 is added to drive the rear wheels of the vehicle, thereby realizing a four-drive force structure of the vehicle.

[0046] The oil cooling channel 21 includes an oil storage chamber 211, an oil inlet channel 212, an oil outlet channel 213 and a bypass oil channel 214. The oil storage chamber 211 is located at the bottom of the housing assembly 1. One end of the oil inlet channel 212 is connected to the oil storage chamber 211, and the other end is connected to the oil inlet end of the oil pump 23. One end of the oil outlet channel 213 is connected to the oil outlet end of the oil pump 23, and the other end is connected to the oil inlet end of the radiator 24. One end of the bypass oil channel 214 is connected to the oil outlet end of the radiator 24, and the other end is connected to the first motor installation chamber 111, the second motor installation chamber 112, the first reducer installation chamber 141 and the second reducer installation chamber 151. The first motor installation chamber 111, the second motor installation chamber 112, the first reducer installation chamber 141 and the second reducer installation chamber 151 are connected to the oil storage chamber 211.

[0047] Therefore, under the pressure boosting effect of the oil pump 23, the cooling oil in the oil storage chamber 211 passes through the oil inlet channel 212, the oil outlet channel 213, the radiator 24, and the bypass oil channel 214 in sequence to reach the various points that need cooling and lubrication in the first motor 34, the second motor 35, the first planetary reducer 47, and the second planetary reducer 48, and then flows back to the oil storage chamber 211 under the fluidity of the cooling oil, forming an oil cooling cycle. Among them, the oil storage chamber 211, the oil inlet channel 212, the oil outlet channel 213, and the bypass oil channel 214 are opened in the housing assembly 1, so that there is no need to set a connecting pipeline outside the housing assembly 1, which improves the degree of integration and makes the structure more compact.

[0048] The water cooling channel 22 includes an inlet channel 221 and an outlet channel 222. One end of the inlet channel 221 is connected to the outer surface of the housing assembly 1 for connecting to the cooling water supply device. The other end of the inlet channel 221 is connected to the water inlet end of the controller 6. One end of the outlet channel 222 is connected to the water outlet end of the controller 6, and the other end is connected to the water inlet end of the radiator 24. The cooling water provided by the cooling water supply device enters the cooling channel of the controller 6 through the inlet channel 221, then enters the radiator 24 through the outlet channel 222 and exchanges heat with the cooling oil, and finally flows back to the cooling water supply device to form a circulation channel for cooling water. Among them, the inlet channel 221 and the outlet channel 222 are both arranged on the side wall of the housing assembly 1, so that except for the pipeline used to connect to the cooling water supply device, the circulation channel of the rest of the cooling water is arranged in the housing assembly 1, which reduces the number of pipelines arranged on the outer surface of the housing assembly 1 and improves the integration degree of the dual-motor distributed drive device.

[0049] The electric drive and electric control housing 11 has a first partition 114, which is arranged between the first motor installation cavity 111, the second motor installation cavity 112 and the controller installation cavity 113, the oil outlet channel 213, the water inlet channel 221 and the water outlet channel 222 are arranged at intervals on the first partition 114, and the radiator 24 is arranged above the first partition 114. Therefore, there is no need for pipe connection between the oil outlet channel 213, the water inlet channel 221 and the water outlet channel 222 and the radiator 24, and the length of the oil outlet channel 213, the water inlet channel 221 and the water outlet channel 222 is shortened, thereby reducing the space required for setting the oil outlet channel 213, the water inlet channel 221 and the water outlet channel 222.

[0050] In one embodiment, the first motor 34 and the second motor 35 have the same structure, and the first motor 34 and the second motor 35 are symmetrically arranged. In order to avoid repeated description, the structure of the first motor 34 and the second motor 35 is described below using motor 3 as an embodiment.

[0051] See also Figure 5 and Figure 8 The motor 3 includes a rotating shaft 31, a rotor 32 and a stator 33. The rotor 32 is fixed on the rotating shaft 31. The stator 33 is arranged on the outer side of the rotor 32 in the circumferential direction and connected to the electric drive and electric control housing 11. The rotor 32 can rotate relative to the stator 33. When the winding on the stator 33 is energized, a magnetic field is formed, and the rotor 32 and the stator 33 are induced to rotate the rotor 32, and then the power is output through the rotating shaft 31.

[0052] The electric drive and electric control housing 11 has a second partition 115, and the second partition 115 is arranged between the first motor installation cavity 111 and the second motor installation cavity 112. A first central hole 311 is arranged on the rotating shaft 31, and the diverter oil passage 214 includes a main flow passage 2141, which is arranged on the second partition 115. One end of the main flow passage 2141 is connected to the oil outlet end of the radiator 24, and the other end is connected to the first central hole 311, so that the cooling oil can cool the rotating shaft 31 of the motor 3, and the path of the diverter oil passage 214 is short, and the oil distribution between the two motors 3 and the two reducer installation cavities is more uniform.

[0053] The branch oil channel 214 also includes a branch channel 2142, which is arranged on the outside of the motor 3. One end of the branch channel 2142 is connected to the main channel 2141, and the other end is connected to the first reducer mounting cavity 141 and the second reducer mounting cavity 151, so that part of the cooling oil in the main channel 2141 is distributed to the first planetary reducer 47 and the second planetary reducer 48 through the branch channel 2142, so as to cool the first planetary reducer 47 and the second planetary reducer 48, and lubricate the gears in the first planetary reducer 47 and the second planetary reducer 48.

[0054] In one embodiment, an oil spray hole facing the circumferential outer surface of the motor 3 is opened on the branch channel 2142, so that part of the cooling oil in the branch channel 2142 can be sprayed on the circumferential outer surface of the motor 3, that is, the outer surface of the stator 33, thereby cooling the stator 33 and improving the cooling effect of the motor 3 and the uniformity of cooling.

[0055] In a preferred embodiment, the branch channel 2142 is arranged at the upper part of the motor 3, so that after the cooling oil is sprayed out from the oil spray hole onto the circumferential outer surface of the motor 3, the cooling oil flows downward under the action of gravity, and then contacts the surface of the lower part of the motor 3, thereby increasing the contact area between the cooling oil and the motor 3, further improving the cooling effect on the motor 3 and the cooling uniformity.

[0056] In one embodiment, the flow channel 2142 is a pipe, and the pipe located outside the first motor 34 is a first pipe, which passes through the first motor installation cavity 111, and the two ends of the first pipe are respectively connected to the second partition plate 115 and the first middle plate 12, and the end of the first pipe away from the second partition plate 115 passes through the first middle plate 12 to achieve communication with the first reducer installation cavity 141. The pipe located outside the second motor 35 is a second pipe, which passes through the second motor installation cavity 112, and the two ends of the second pipe are respectively connected to the second partition plate 115 and the second middle plate 13, and the end of the second pipe away from the second partition plate 115 passes through the second middle plate 13 to achieve communication with the second reducer installation cavity 151.

[0057] In other embodiments, the branch channel 2142 can be a channel opened on the side wall of the electric drive and electronic control housing 11, and the electric drive and electronic control housing 11 has a first oil through hole drilled on the side wall of the first motor mounting cavity 111, one end of the first oil through hole is connected to the main channel 2141, and the other end is connected to the end surface of the electric drive and electronic control housing 11, and the first intermediate plate 12 is provided with a second oil through hole at the position corresponding to the first oil through hole, so that the cooling oil in the main channel 2141 can pass through the first oil through hole and the second oil through hole into the first reducer mounting cavity 141. Similarly, the electric drive and electric control housing 11 has a third oil through hole drilled on the side wall of the second motor installation cavity 112, one end of the third oil through hole is connected to the main flow channel 2141, and the other end is connected to the end surface of the electric drive and electric control housing 11, and the second intermediate plate 13 is provided with a fourth oil through hole at the position corresponding to the third oil through hole, so that the cooling oil in the main flow channel 2141 can pass through the third oil through hole and the fourth oil through hole into the second reducer installation cavity 151. Among them, the first oil through hole and the second oil through hole, as well as the third oil through hole and the fourth oil through hole all constitute the branch flow channel 2142.

[0058] In one embodiment, the first center hole 311 is arranged along the axial direction of the rotating shaft 31, and the rotating shaft 31 is further provided with a plurality of first through holes 312, which are arranged at intervals along the axial direction of the rotating shaft 31, and the first through holes 312 communicate with the first center hole 311 and the circumferential outer surface of the rotating shaft 31. Among them, at least one first through hole 312 is located in the first motor installation cavity 111, at least one first through hole 312 is located in the second motor installation cavity 112, at least one first through hole 312 is located in the first reducer installation cavity 141, and at least one first through hole 312 is located in the second reducer installation cavity 151, so that the cooling oil entering the first center hole 311 of the rotating shaft 31 can be distributed to the first planetary reducer 47, the second planetary reducer 48, the rotor 32 of the first motor 34, and the rotor 32 of the second motor 35 through each first through hole 312, so that the cooling of the dual-motor distributed drive device is more uniform and local high temperature is avoided. That is, the first through hole 312 on the rotating shaft 31 of the first motor 34 is arranged corresponding to the position of the first motor installation cavity 111 and the first reducer installation cavity 141, and the first through hole 312 on the rotating shaft 31 of the second motor 35 is arranged corresponding to the position of the second motor installation cavity 112 and the second reducer installation cavity 151. By providing a plurality of first through holes 312 on the rotating shaft 31, the first through holes 312 are connected to the first motor installation cavity 111, the second motor installation cavity 112, the first reducer installation cavity 141 and the second reducer installation cavity 151, so that the first center hole 311 and the first through holes 312 form an oil passage parallel to the branch channel 2142, and the positions of the settings are different, so that the cooling oil is more evenly distributed.

[0059] In a preferred embodiment, the first through hole 312 is arranged along the radial direction of the rotating shaft 31, so that the processing of the first through hole 312 is convenient, and when the rotating shaft 31 rotates, the cooling oil can flow to the outside of the rotating shaft 31 of the motor 3 and the planetary reducer 4 more easily under the action of centrifugal force.

[0060] In detail, the rotating shaft 31 of the first motor 34 is connected to the first middle plate 12 and the second partition plate 115 through a bearing, which can reduce the friction between the rotating shaft 31 of the first motor 34 and the first middle plate 12 and the second partition plate 115. The rotating shaft 31 of the second motor 35 is connected to the second middle plate 13 and the second partition plate 115 through a bearing, which can reduce the friction between the rotating shaft 31 of the second motor 35 and the second middle plate 13 and the second partition plate 115. In this embodiment, the first through hole 312 is provided so that the cooling oil can reach the bearing to achieve cooling and lubrication of the bearing.

[0061] In the above, the two motors 3 and the two planetary reducers 4 share a cooling system, the first reducer mounting cavity 141 and the second reducer mounting cavity 151 are structurally connected, and the two motor 3 rotors 32 are centrally distributed with oil through an oil channel on the casing, so that the dual-motor distributed drive device has a higher degree of integration and a smaller volume.

[0062] In one embodiment, the axial length of the rotor 32 is less than the axial length of the stator 33. The rotor 32 of the motor 3 disposed in the first motor installation cavity 111 is a first rotor, and a first space is formed between the first intermediate plate 12 and the first rotor. The dual-motor distributed drive device further includes a first rotation angle sensor 51, which is disposed in the first space and connected to the first intermediate plate 12, so that the space between the first intermediate plate 12 and the first rotor is fully utilized to install the first rotation angle sensor 51, making the structure more compact and reducing the axial length of the dual-motor distributed drive device along the first motor 34. Among them, the first rotation angle sensor 51 is used to monitor the rotation angle of the first rotating shaft of the motor 3.

[0063] Similarly, the rotor 32 of the motor 3 disposed in the second motor installation cavity 112 is the second rotor, and a second space is formed between the second intermediate plate 13 and the second rotor; the dual-motor distributed drive device further includes a second rotation angle sensor 52, which is disposed in the second space and connected to the second intermediate plate 13, so that the space between the second intermediate plate 13 and the second rotor is fully utilized to install the second rotation angle sensor 52, making the structure more compact and reducing the length of the dual-motor distributed drive device along the axial direction of the first motor 34. The second rotation angle sensor 52 is used to monitor the rotation angle of the second shaft of the motor 3.

[0064] In one embodiment, the first planetary reducer 47 and the second planetary reducer 48 have the same structure, and the first planetary reducer 47 and the second planetary reducer 48 are symmetrically arranged. In order to avoid repetition, the structure of the first planetary reducer 47 and the second planetary reducer 48 is described below using the planetary reducer 4 as an embodiment.

[0065] See also Figure 5 , Figure 6 and Figure 8The planetary reducer 4 includes a sun gear 41, a planet carrier 42, a planetary gear 43, a ring gear 44 and an output shaft 45. The sun gear 41 is connected to the rotating shaft 31. The ring gear 44 is arranged on the circumferential outer side of the sun gear 41. The planetary gear 43 is arranged between the sun gear 41 and the ring gear 44 and meshes with both the sun gear 41 and the ring gear 44. The planetary carrier 42 is provided with a needle roller 421, which is rotatably connected to the planetary gear 43. The output shaft 45 is fixedly connected to the planetary carrier 42. Among them, the ring gear 44 arranged in the first reducer installation cavity 141 is the first ring gear, which is connected to the first end cover 14, and the ring gear 44 arranged in the second reducer installation cavity 151 is the second ring gear, which is connected to the second end cover 15. Through the above arrangement, the motor 3 is transmitted to the output shaft 45 through the sun gear 41, the planetary gear 43 and the planetary carrier 42.

[0066] The output shaft 45 disposed in the first reducer installation cavity 141 is the first output shaft, which is sealed and connected to the first end cover 14, and the first output shaft can rotate relative to the first end cover 14, so that the first output shaft can be connected to the external wheel end, and the first output shaft and the first end cover 14 are sealed and connected to avoid oil leakage. Similarly, the gear ring 44 disposed in the second reducer installation cavity 151 is the second output shaft, which is sealed and connected to the second end cover 15, and the second output shaft can rotate relative to the second end cover 15, so that the second output shaft can be connected to the external wheel end, and the second output shaft and the second end cover 15 are sealed and connected to avoid oil leakage. Therefore, the dual-motor distributed drive device can complete the oil filling when it is assembled off the line, and there is no need to add half-axle sealing during transportation, and the vehicle production line does not need to be refueled, which saves the whole vehicle assembly and refueling process and reduces the whole vehicle production line cost.

[0067] Among them, the first output shaft is coaxially arranged with the rotating shaft 31 of the first motor 34, and the second output shaft is coaxially arranged with the rotating shaft 31 of the second motor 35, which reduces the space occupied by the dual-motor distributed drive device in the length direction of the vehicle, making it more convenient to arrange the dual-motor distributed drive device on the vehicle.

[0068] The planetary gear 43 includes a first gear 431 and a second gear 432, and the first gear 431 and the second gear 432 are fixedly connected, the first gear 431 meshes with the sun gear 41, and the second gear 432 meshes with the ring gear 44. The diameter of the first gear 431 is greater than the diameter of the second gear 432, so that the first gear 431 and the sun gear 41 and the second gear 432 and the ring gear 44 form a two-stage reduction transmission of the planetary reducer 4, and a larger transmission ratio is obtained. The transmission structure with a large reduction ratio is also more adaptable to the trend of the motor 3 to develop to a higher speed. Compared with other planetary reducers that can achieve high-speed ratio transmission, when the same transmission ratio is obtained, the size of the second gear 432 and the ring gear 44 can be reduced, so that while ensuring the strength of the shaft 31 of the first motor 34 and the second motor 35, the volume of the dual-motor distributed drive device is reduced, the structural integration of the dual-electric drive distributed drive is improved, the volume envelope of the assembly is reduced, and the weight of the assembly is reduced, thereby improving the power density of the dual-motor distributed drive device, reducing the demand for the torque performance of the motor 3, and reducing the production cost.

[0069] Among them, the first gear 431 and the second gear 432 are distributed along the axial direction of the needle roller 421 to form a double-row planetary gear structure. The planetary reducer 4 including the double-row planetary gear structure can realize coaxial output of the power of the motor 3, and the axial and radial space occupied by the double-row planetary gear is smaller than the space occupied by the parallel shaft reducer, thereby reducing the volume of the dual-motor distributed drive device.

[0070] The needle roller 421 is provided with a second center hole 422 and a second through hole 423, the second center hole 422 is arranged along the axial direction of the needle roller 421, and is communicated with one end surface of the needle roller 421, and the second through hole 423 communicates the second center hole 422 and the circumferential outer surface of the needle roller 421, so that the cooling oil can flow to the rotation connection position of the planetary gear 43 and the needle roller 421 through the second center hole 422 and the second through hole 423, so as to realize the cooling and lubrication of the planetary gear and the needle roller 421. In detail, the planetary gear 43 is rotationally connected to the needle roller 421 through the bearing, so the cooling oil can cool and lubricate the bearing after passing through the second center hole 422 and the second through hole 423.

[0071] In one embodiment, the second through hole 423 is disposed between the first gear 431 and the second gear 432 , so that the cooling oil between the first gear 431 and the needle roller 421 and between the second gear 432 and the needle roller 421 is more evenly distributed.

[0072] An oil guide member 46 is provided on the planet carrier 42 , the oil inlet of the oil guide member 46 is close to the first through hole 312 , and the oil outlet of the oil guide member 46 is connected to the second center hole 422 , so that part of the cooling oil flowing out of the first through hole 312 flows into the second center hole 422 through the oil guide member 46 .

[0073] In the above, the planetary reducer 4 (i.e., the first planetary reducer 47 and the second planetary reducer 48) is used between the first motor 34 and the wheel end, and between the second motor 35 and the wheel end, so that the first motor 34 and the first planetary reducer 47, the second motor 35 and the second planetary reducer 48 can output coaxially, and compared with the parallel shaft reducer, the volume is smaller, so that the volume of the housing assembly 1 is smaller. According to calculations, when the same transmission ratio is obtained, the planetary reducer 4 is at least one third smaller in volume and weight than the parallel shaft reducer.

[0074] After the parallel shaft reducer is installed, there must be a height difference between the transmission shafts. When the height difference is too large, it will cause poor lubrication of the gears or bearings on a certain transmission shaft. At this time, additional forced lubrication measures are required to ensure the function, which leads to a larger volume and a more complex structure. The present application adopts a planetary reducer 4, because the needle roller 421 on the planetary carrier 42 changes its height position as the planetary carrier 42 rotates, that is, the needle roller 421 can reach a lower position in the reducer installation cavity, thereby ensuring that each gear and bearing can contact with the cooling oil.

[0075] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and the utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the utility model.

Claims

1. Dual-motor distributed drive device, characterized in that: include: A housing assembly, comprising an electric drive and electric control housing, a first middle plate, a second middle plate, a first end cover and a second end cover, wherein the electric drive and electric control housing is integrally formed, and is provided with a first motor mounting cavity, a second motor mounting cavity and a controller mounting cavity, wherein the first motor mounting cavity and the second motor mounting cavity are coaxially arranged, and the controller mounting cavity is arranged on the same radial side of the first motor mounting cavity and the second motor mounting cavity, the first middle plate is arranged at an opening end of the first motor mounting cavity, the first end cover is fixed on the first middle plate, a first reducer mounting cavity is formed between the first end cover and the first middle plate, the second middle plate is arranged at the opening end of the second motor mounting cavity, the second end cover is fixed on the second middle plate, and a second reducer mounting cavity is formed between the second end cover and the second middle plate; A cooling component includes an oil cooling channel, a water cooling channel, an oil pump and a radiator. The oil cooling channel and the water cooling channel are arranged inside the electric drive and electronic control housing. The oil cooling channel is connected to the first motor mounting cavity, the second motor mounting cavity, the first reducer mounting cavity and the second reducer mounting cavity. The water cooling channel is connected to the controller mounting cavity. The oil pump and the radiator are fixed on the electric drive and electronic control housing, and the radiator is connected to the oil cooling channel and the water cooling channel. The oil pump is connected in series to the oil cooling channel.

2. The dual-motor distributed drive device according to claim 1, characterized in that: The oil cooling channel includes an oil storage chamber, an oil inlet channel, an oil outlet channel and a diverter oil channel. The oil storage chamber, the oil inlet channel, the oil outlet channel and the diverter oil channel are opened in the electric drive and electronic control housing. The oil storage chamber is located at the bottom of the electric drive and electronic control housing. One end of the oil inlet channel is communicated with the oil storage chamber, and the other end is communicated with the oil inlet end of the oil pump. One end of the oil outlet channel is communicated with the oil outlet end of the oil pump, and the other end is communicated with the oil inlet end of the radiator. One end of the diverter oil channel is communicated with the oil outlet end of the radiator, and the other end is communicated with the first motor mounting chamber, the second motor mounting chamber, the first reducer mounting chamber and the second reducer mounting chamber. The first motor mounting chamber, the second motor mounting chamber, the first reducer mounting chamber and the second reducer mounting chamber are communicated with the oil storage chamber.

3. The dual-motor distributed drive device according to claim 2, characterized in that: The electric drive and electric control housing has a second partition plate, and the second partition plate is arranged between the first motor installation cavity and the second motor installation cavity; A motor is installed in each of the first motor installation cavity and the second motor installation cavity, the motor includes a rotating shaft, the rotating shaft is provided with a first center hole, the flow-dividing oil passage includes a main flow passage and a branch flow passage, the main flow passage is provided on the second partition plate, one end of the main flow passage is connected to the oil outlet end of the radiator, and the other end is connected to the first center hole; The shunt channel is arranged on the outside of the motor, one end of the shunt channel is communicated with the main channel, and the other end of the shunt channel is communicated with the first reducer installation cavity and the second reducer installation cavity.

4. The dual-motor distributed drive device according to claim 3, characterized in that: The branch flow channel is provided with an oil injection hole facing the circumferential outer surface of the motor.

5. The dual-motor distributed drive device according to claim 3, characterized in that: The first center hole is arranged along the axial direction of the rotating shaft, and the rotating shaft is further provided with a plurality of first through holes, which are arranged at intervals along the axial direction of the rotating shaft, and the first through holes communicate with the first center hole and the circumferential outer surface of the rotating shaft; At least one of the first through holes is located in the first motor mounting cavity, at least one of the first through holes is located in the second motor mounting cavity, at least one of the first through holes is located in the first reducer mounting cavity, and at least one of the first through holes is located in the second reducer mounting cavity.

6. The dual-motor distributed drive device according to claim 5, characterized in that: A planetary reducer is disposed in each of the first reducer installation cavity and the second reducer installation cavity; The planetary reducer comprises a sun gear, a planet carrier, planetary gears, a ring gear and an output shaft, wherein the sun gear is connected to the rotating shaft, the ring gear is arranged on the circumferential outer side of the sun gear, the planetary gears are arranged between the sun gear and the ring gear, and mesh with both the sun gear and the ring gear, the planetary carrier is provided with a needle roller, the needle roller is rotatably connected to the planetary gear, and the output shaft is fixedly connected to the planet carrier; The needle roller is provided with a second center hole and a second through hole, the second center hole is arranged along the axial direction of the needle roller and is connected to one end surface of the needle roller, and the second through hole is connected to the second center hole and the circumferential outer surface of the needle roller; The gear ring disposed in the first reducer installation cavity is the first gear ring, which is connected to the first end cover, and the gear ring disposed in the second reducer installation cavity is the second gear ring, which is connected to the second end cover.

7. The dual-motor distributed drive device according to claim 6, characterized in that: The planetary gear includes a first gear and a second gear, and the first gear is fixedly connected to the second gear, the first gear is meshed with the sun gear, the second gear is meshed with the ring gear, and the diameter of the first gear is greater than the diameter of the second gear; The second through hole is arranged between the first gear and the second gear; An oil guide member is disposed on the planet carrier, an oil inlet of the oil guide member is close to the first through hole, and an oil outlet of the oil guide member is communicated with the second center hole.

8. The dual-motor distributed drive device according to claim 3, characterized in that: The motor further comprises a rotor and a stator, wherein the rotor is fixed on the rotating shaft, the stator is arranged on the circumferential outer side of the rotor and connected to the electric drive and electric control housing, and the axial length of the rotor is smaller than the axial length of the stator; The rotor of the motor disposed in the first motor installation cavity is a first rotor, a first space is formed between the first intermediate plate and the first rotor, and the rotor of the motor disposed in the second motor installation cavity is a second rotor, a second space is formed between the second intermediate plate and the second rotor; The dual-motor distributed drive device also includes a first rotation angle sensor and a second rotation angle sensor. The first rotation angle sensor is arranged in the first space and connected to the first middle plate. The second rotation angle sensor is arranged in the second space and connected to the second middle plate.

9. The dual-motor distributed drive device according to claim 2, characterized in that: A controller is installed in the controller installation cavity; The water cooling channel includes a water inlet channel and a water outlet channel, and the water inlet channel and the water outlet channel are both arranged on the side wall of the electric drive and electronic control housing. One end of the water inlet channel is connected to the outer surface of the electric drive and electronic control housing for connecting to a cooling water supply device, and the other end of the water inlet channel is connected to the water inlet end of the controller. One end of the water outlet channel is connected to the water outlet end of the controller, and the other end is connected to the water inlet end of the radiator.

10. The dual-motor distributed drive device according to claim 9, characterized in that: The electric drive and electric control housing has a first partition, which is arranged between the first motor installation cavity, the second motor installation cavity and the controller installation cavity. The oil outlet channel, the water inlet channel and the water outlet channel are arranged at intervals on the first partition, and the radiator is arranged above the first partition.

11. A vehicle, characterized in that: It comprises a vehicle body, a wheel end and a dual-motor distributed drive device as described in any one of claims 1-10, wherein the dual-motor distributed drive device is fixed on the vehicle body, and the wheel end is connected to the output shaft of the dual-motor distributed drive device.

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