A drive assembly and vehicle with a ring-shaped heat dissipation bridge

Abstract

The present invention provides a drive assembly and a vehicle with a heat dissipation bridge arranged in an annular manner, comprising a housing, a stator, a rotor and a motor control device, wherein the motor control device is located at the axial rear end of the rotor and in a control placement cavity, and a power tube module of the motor control device is located at the periphery of a circuit board module; the power tube module comprises a heat dissipation bridge assembly and a plurality of power tubes, the heat dissipation bridge assembly is arranged at the periphery of the circuit board module based on the axis of the rotor, the heat dissipation bridge assembly is provided with a cooling channel, the heat dissipation bridge assembly is provided with interface ends at both ends of the cooling channel, the heat dissipation bridge assembly is provided with heat conducting surfaces on both sides, a plurality of power tubes are distributed on both sides and are connected to the heat conducting surfaces by thermal conduction, and the interface ends are connected to the liquid cooling channel. By arranging the power tubes on the heat conducting surfaces on both sides, and the heat dissipation bridge assembly is arranged at the periphery of the circuit board module and can be arranged in an annular manner, not only the annular space at the periphery of the circuit board module is fully utilized, but also the number of power devices arranged is increased, which is conducive to improving the performance of the equipment.

Description

Technical Field

[0001] The present invention relates to the field of new energy, and in particular to a drive assembly and a vehicle with a heat dissipation bridge arranged in a ring. Background Art

[0002] New energy vehicles do not burn gasoline or diesel to generate power, so they have many characteristics such as environmental protection and low pollution. With the vigorous promotion and application of new energy power generation such as hydropower, wind power, solar power and nuclear power, many new energy vehicles are gradually being promoted and applied, such as new energy electric cars, new energy electric buses, new energy electric trucks, new energy electric cleaning vehicles, new energy electric rail transportation vehicles, new energy electric flying transportation vehicles, new energy electric shipping transportation vehicles, etc.

[0003] New energy vehicles are generally equipped with batteries, motor control devices, motors and power generation devices. The power tube in the motor control device receives the DC power output by the battery, and converts the DC power into AC power for output to the motor. The motor then outputs a rotational driving force to drive the power generation devices such as wheels and paddles, which in turn drive the vehicle to move.

[0004] With the integration of the driving assembly, i.e., the motor and the motor control device, in vehicles, such as the driving assembly disclosed in the publication number CN110855161A, the space utilization is improved at the rear end of the shaft of the rotor of the motor control device to achieve a high degree of integration of the driving assembly, and multiple power tubes are arranged circumferentially and form a heat conduction connection with the inner wall of the control installation cavity, and cooperate with the interconnected motor cooling groove and control cooling groove to achieve integrated liquid cooling. Since the inner circumferential wall is used as the heat conduction interface of the power tube, but the inner circumferential wall is determined by the size of the shell, the limited inner circumferential wall area will affect the number of power tube devices arranged, thereby directly affecting the performance release of the motor control device. Summary of the invention

[0005] A first object of the present invention is to provide a drive assembly that utilizes a ring-shaped heat dissipation bridge to increase the number of power tubes arranged.

[0006] A second object of the present invention is to provide a vehicle having the above-mentioned drive assembly.

[0007] In order to achieve the first purpose of the present invention, the present invention provides a drive assembly with a ring-shaped heat dissipation bridge, including a casing, a stator, a rotor and a motor control device, a liquid cooling channel is arranged on the outer wall of the casing, the casing is surrounded by a motor placement cavity and a control placement cavity, the stator and the rotor are located in the motor placement cavity, the motor control device is located at the axial rear end of the rotor and in the control placement cavity, the motor control device includes a circuit board module and a power tube module, the circuit board module is located in the middle, and the power tube module is located at the periphery of the circuit board module; the power tube module includes a heat dissipation bridge component and a plurality of power tubes, the heat dissipation bridge component is arranged on the periphery of the circuit board module based on the axis of the rotor, the heat dissipation bridge component is provided with a cooling channel, the heat dissipation bridge component is respectively provided with interface ends at both ends of the extension direction of the cooling channel, the heat dissipation bridge component is provided with heat conduction surfaces on opposite sides of the cooling channel, the plurality of power tubes are distributed on opposite sides of the cooling channel and are thermally connected to the heat conduction surfaces, and the interface end is communicated with the liquid cooling channel.

[0008] It can be seen from the above scheme that by setting up an independent heat dissipation bridge component, in addition to setting up cooling channels for heat conduction, the heat dissipation bridge component also sets heat conduction surfaces on both sides, so that the power tubes can be set on the heat conduction surfaces on both sides, and the heat dissipation bridge component is set on the periphery of the circuit board module and can be arranged in an annular direction, which not only makes full use of the annular space on the periphery of the circuit board module, and increases the number of power devices arranged by using the two-sided arrangement, which is beneficial to improving the performance of the equipment, and uses the independent heat-conducting heat dissipation bridge component to improve the heat dissipation efficiency, so that the performance of the equipment can be more fully released.

[0009] A further solution is that a partition wall is radially arranged on the inner wall of the casing, and the partition wall is located between the motor placement cavity and the control placement cavity. The liquid cooling channel includes a first inner groove arranged in the partition wall, and the first inner groove is isolated from the motor placement cavity and the control placement cavity. The interface end is fixedly mounted on the partition wall and communicated with the first inner groove.

[0010] As can be seen from the above, the radially arranged partition walls provide stable installation and fixation for the interface end of the heat dissipation bridge assembly, and the first inner groove in the partition walls is used for drainage, so that the coolant in the liquid cooling channel can stably pass through the cooling channel.

[0011] A further solution is that the heat dissipation bridge assembly includes a heat dissipation bridge and two interface parts. The heat dissipation bridge is arranged along an arc extension or along an arc with multiple obtuse angle bends. The cooling channel is arranged in the heat dissipation bridge. The heat conducting surface is located on the outer walls on both sides of the heat dissipation bridge. The two interface parts are respectively connected to the two ends of the heat dissipation bridge, and the interface ends are located on the interface parts.

[0012] It can be seen from the above that the annular space on the periphery of the circuit board module can be fully utilized through arc extension or arc-shaped multiple obtuse-angle bends. The simplified structure can arrange more power tubes. Furthermore, the arc-shaped multiple-segment setting allows the power tubes to better engage with the heat-conducting surface, thereby improving the heat conduction efficiency.

[0013] A further solution is that the heat dissipation bridge assembly includes at least two heat dissipation bridges and at least two interface parts, the cooling channel is arranged in the heat dissipation bridge, the heat conducting surface is located on the outer walls on both sides of the heat dissipation bridge, the interface part is provided with two mutually isolated transfer channels, the transfer channel is respectively provided with an interface end and a connection end at both ends, and the heat dissipation bridge is connected between the connection ends of two adjacent interface parts.

[0014] As can be seen from the above, two mutually isolated transfer channels are provided through the interface component, so that the interface component can be connected to two independent heat dissipation bridges, and the integrated installation simplifies the assembly and fixation of the heat dissipation bridge.

[0015] A further solution is that the liquid cooling channel further comprises a second inner groove arranged on the outer wall of the housing, the second inner groove is located outside the motor placement cavity, an inlet groove is arranged on the outer wall of the housing outside the motor placement cavity, the second inner groove is provided with a diverter rib, and the diverter rib is opposite to the inlet groove;

[0016] The first inner groove includes at least two sector inner grooves, and the sector inner groove includes a cooling input groove, a cooling output groove and a spacing inner groove. The cooling input groove and the cooling output groove are located on both sides of the spacing inner groove. The cooling input groove is connected with the second inner groove. The cooling channel is connected between the cooling input groove and the cooling output groove. The spacing inner groove is connected with the cooling output groove.

[0017] A further solution is that the liquid cooling channel also includes at least two third inner grooves arranged on the outer wall of the casing, the third inner grooves are located outside the motor placement cavity, and the third inner grooves are connected to the spacer inner grooves.

[0018] As can be seen from the above, the newly input coolant is diverted by the diversion ribs, and then the coolant first enters the cooling channel of the heat dissipation bridge with high heat for heat conduction, then enters the interval inner groove for heat conduction, and finally enters the third inner groove on the outside of the motor placement cavity, which not only ensures the heat dissipation priority of the power tube, but also makes the heat conduction and heat dissipation of the entire drive assembly more sufficient and reasonable.

[0019] A further solution is that the heat dissipation bridge assembly includes three heat dissipation bridges and three interface parts; the liquid cooling channel also includes a second inner groove arranged on the outer wall of the casing, the second inner groove is located on the outside of the motor placement cavity, and an inlet groove is arranged on the outer wall of the casing outside the motor placement cavity, and the second inner groove is provided with diverter ribs, converging ribs and two guide ribs, and the diverter ribs are opposite to the inlet groove; the first inner groove includes three sector inner grooves, the sector inner groove includes a cooling input groove, a cooling output groove and a spacing inner groove, the cooling input groove and the cooling output groove are located on both sides of the spacing inner groove, the cooling input groove is connected with the second inner groove, the cooling channel is connected between the cooling input groove and the cooling output groove, and the spacing inner groove is connected with the cooling output groove; the diversion length of the guide rib is two-thirds of the width of the second inner groove, the two guide ribs are located on both sides of the diverter rib, the two guide ribs are respectively located at two of the cooling input grooves, the converging rib is located between the two guide ribs and on the opposite side of the diverter rib, and the converging rib faces the other cooling input groove.

[0020] As can be seen from the above, by arranging the three-phase power tube groups corresponding to the three heat dissipation bridges, and utilizing the diversion coordination of the diversion ribs, the converging ribs and the two guide ribs, the coolant is evenly input into the three heat dissipation bridges for heat conduction, and then respectively input into the three sectors for heat conduction, so that the liquid cooling channel has better heat dissipation uniformity.

[0021] A further solution is that the pins of the power tube are located on the back side of the interface end, and the pins of the power tube are connected to the circuit board module.

[0022] As can be seen from above, the pins located on the back side are more convenient for connecting with the circuit board module.

[0023] A further solution is that the heat dissipation bridge is made by an extrusion molding process.

[0024] As can be seen from the above, a profile is made by extrusion molding process using a customized mold, and then a cooling groove is formed along the length direction. Not only can the length of the profile be easily adjusted, the shape of the cooling groove can be easily customized, and it is convenient to bend and shape. Then, a larger thermal contact surface can be designed, and then a higher thermal conductivity efficiency can be achieved. The extruded profile has a higher density, good sealing, and avoids leakage. At the same time, the production cost is relatively low.

[0025] In order to achieve the second object of the present invention, the present invention provides a vehicle, comprising a drive assembly as described above.

[0026] As can be seen from the above, increasing the number of power devices arranged on both sides is beneficial to improving equipment performance, and using an independent heat-conducting heat dissipation bridge component to improve heat dissipation efficiency, thereby improving the operating stability of the powertrain and vehicle, as well as higher power performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of an embodiment of a drive assembly of the present invention.

[0028] Figure 2 It is a structural diagram of an embodiment of the drive assembly of the present invention from the perspective of the rear end of the shaft.

[0029] Figure 3 It is a structural diagram of a power tube module in an embodiment of a drive assembly of the present invention.

[0030] Figure 4 It is a structural diagram of an embodiment of the drive assembly of the present invention at a first radial side viewing angle.

[0031] Figure 5 It is a structural diagram of an embodiment of the drive assembly of the present invention at a second radial side viewing angle.

[0032] Figure 6 It is a cross-sectional view of an embodiment of the drive assembly of the present invention along a radial surface at the heat dissipation bridge.

[0033] Figure 7 It is a cross-sectional view of an embodiment of the drive assembly of the present invention along a radial surface at the partition wall.

[0034] Figure 8 It is a structural diagram of a motor control device in an embodiment of a drive assembly of the present invention.

[0035] Fig. 9 It is an exploded view of the motor control device in the drive assembly embodiment of the present invention.

[0036] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0037] Drive assembly embodiment:

[0038] Reference Figures 1 to 7 The drive assembly 1 includes a casing 11, a stator, a rotor and a motor control device 2. A liquid cooling channel is arranged on the outer wall of the casing 11, and a peripheral wall 12 is arranged on the outer side of the liquid cooling channel. The casing 11 encloses a motor placement cavity and a control placement cavity. A partition wall 101 is radially arranged on the inner wall of the casing 11, and the partition wall 101 is located between the motor placement cavity and the control placement cavity. The stator and the rotor are located in the motor placement cavity. The motor control device 2 is located at the axial rear end of the rotor and in the control placement cavity. The motor control device 2 includes a circuit board module 21 and a power tube module 22. The circuit board module 21 is located in the middle, and the power tube module 22 is located on the periphery of the circuit board module 21.

[0039] The power tube module 22 includes a heat dissipation bridge assembly and multiple power tubes 25, three heat dissipation bridges 23 and three interface parts 24. The heat dissipation bridge 23 can be made of materials such as aluminum and its alloys, copper and its alloys, or zinc and its alloys. The heat dissipation bridge 23 is made by an extrusion molding process along the length direction X. During the extrusion and stretching molding, a customized mold is used to make the heat dissipation bridge 23 penetrate along the length direction X. The heat dissipation bridge 23 is provided with heat conducting surfaces 233 on opposite sides of the cooling channel 232. After the heat dissipation bridge 23 is linearly extruded, it is bent into multiple straight sections through multiple sections. The adjacent straight sections are arranged at an obtuse angle, and the multiple straight sections are distributed along the arc direction. The heat dissipation bridge 23 is provided with access ends 231 at both ends of the extension direction of the cooling channel 232.

[0040] The interface member 24 is provided with two transfer channels isolated from each other, and the transfer channels are arranged in an L shape. The transfer channel is respectively provided with an interface end 242 and a connection end 241 at both ends. The access end 231 is inserted into the connection end 241 and connected by welding. The heat dissipation bridge 23 is connected between the connection ends 241 of two adjacent interface members 24. The heat dissipation bridge 23 is arranged to extend approximately along 120°, and then through the mutual connection of three heat dissipation bridges 23 and three interface members 24, the heat dissipation bridge assembly is located on the periphery of the circuit board module 21 based on the axis of the rotor and arranged along a 360° ring.

[0041] Multiple power tubes 25 are distributed on the heat-conducting surfaces 233 on both sides, and the heat-conducting sheet 261 is adjacent to the power tube 25 and the clip 262, thereby realizing the thermal conduction connection between the power tube 25 and the heat-conducting surface 233. The power tube of one bridge arm is set on a heat dissipation bridge for heat dissipation, and the interface end 242 faces the partition wall 101. The pins of the power tube 25 are located on the back side of the interface end 242, and the pins of the power tube 25 are connected to the circuit board 36 of the circuit board module 21.

[0042] The liquid cooling channel includes a first inner groove, a second inner groove and at least three third inner grooves 117, which are all arranged on the outer wall of the casing 11. The second inner groove 112 is located on the outside of the control placement cavity and is arranged in a ring shape. An inlet groove 111 is arranged on the outer wall of the casing 11 outside the control placement cavity. The second inner groove 112 is provided with a diverter rib 1121, a converging rib 1123 and two guide ribs 1122. The diverter ribs 1121 and the converging ribs 1123 are arranged in a symmetrical conical shape, and the tip of the diverter rib 1121 is opposite to the inlet groove 111.

[0043] The first inner groove is arranged in the partition wall 101, and the first inner groove is isolated from the motor placement cavity and the control placement cavity. The first inner groove includes three sector inner grooves. Figure 6A sector inner groove is the area between two adjacent radial lines D. The sector inner groove includes a cooling input groove 114, a cooling output groove 116 and an interval inner groove 113. The cooling input groove 114 is provided with an input port along the axial direction, and the cooling output groove 116 is provided with an output port along the axial direction. The cooling input groove 114 and the cooling output groove 116 are located on both sides of the interval inner groove 113. The interval inner groove 113 is arranged in a multi-stage connection and is provided with a guide plug. The three sector inner grooves are distributed along the circumferential direction.

[0044] The flow guiding length of the flow guiding rib 1122 is two-thirds of the width of the second inner groove 112. Both the flow guiding length and the width of the inner groove are lengths in the axial direction. The two flow guiding ribs 1122 are located on both sides of the flow dividing rib 1121. The two flow guiding ribs 1122 are respectively located at two of the cooling input grooves 114, thereby realizing the introduction of the coolant from the second inner groove 112 to the cooling input groove 114. The converging rib 1123 is located between the two flow guiding ribs 1122 and on the opposite side of the flow dividing rib 1121. The end of the converging rib 1123 faces the other cooling input groove 114. Through the half-flow diversion of the diverting rib 1121, the two-thirds flow diversion of the flow guiding rib 1122, and the converging of the converging rib 1123, the equal flow introduction of the three cooling input grooves 114 is realized.

[0045] The interface member 24 is provided with a positioning hole 243 between the two interface ends 242, and the positioning hole 243 is fixedly connected to the partition wall 101 by screws. The interface end 242 at one end of the heat dissipation bridge 23 is connected to the input port of the cooling input groove 114, and the interface end 242 at one end of the heat dissipation bridge 23 is connected to the output port of the cooling output groove 116. After the coolant is introduced from the cooling input groove 114, it is input into the cooling channel 232 of the heat dissipation bridge 23, and then output from the cooling output groove 116, then flows through the partition inner groove 11, and finally outputs from the tail end 116.

[0046] The third inner groove 117 is located outside the motor placement cavity, and the third inner groove is spirally arranged along the axial direction. Three third inner grooves 117 are evenly distributed in the circumferential direction. One third inner groove 117 is connected to the tail end 116 of a spacer inner groove 113, and then the coolant output from the tail end 116 flows into the third inner groove 117 for heat dissipation. An outlet groove 111 is provided on the outer wall of the housing 11 outside the motor placement cavity. The three third inner grooves 117 converge near the outlet groove 111 and flow out from the outlet groove 111. Thus, the power tube 25, the partition wall 101 and the outer wall of the motor placement cavity are sequentially heat-dissipated in an integrated manner along the flow direction, and the flow channel design of shunting and converging is used to achieve uniform heat dissipation of the three-phase power tube.

[0047] Of course, the above embodiments are only preferred embodiments of the present case, and there may be more variations in actual applications. For example, the heat dissipation bridge assembly may be arranged in an integrated manner, the heat dissipation bridge may be arranged along an arc-shaped extension, and the interface end of the heat dissipation bridge assembly may be directly connected to the cooling channel. In addition, the heat dissipation bridge may also be arranged in a straight line and distributed on the periphery of the circuit board assembly, which may also achieve heat dissipation for the heat dissipation bridge and the power tube. The first inner groove may include two sector inner grooves, or correspondingly include two third inner grooves, which may also dissipate heat for the partition wall and the motor. In addition, the number of heat dissipation bridges may be adjusted according to actual needs. As long as an independent heat dissipation bridge is used, the heat dissipation bridge has more heat conduction surfaces, so that more power tubes can be configured, which also achieves the purpose of the present invention.

[0048] Reference Figure 8 and Fig. 9 The circuit board module 21 of the motor control device 2 includes a shell cover 35, a film capacitor module 34, a first connecting plate 31, a second connecting plate 32 and three single-phase connecting plates 33. The shell cover 35 is arranged in a bottomed annular cylindrical shape, and the shell cover 35 surrounds an annular mounting groove. The first connecting plate 31 and the second connecting plate 32 are both made of conductive material. The first connecting plate 31 is arranged in a bottomed annular cylindrical shape. The first connecting plate 31 is provided with an annular bottom wall, a first inner annular wall 311 and a first outer annular wall 312. The first inner annular wall 311 is connected to the inner side of the annular bottom wall, and the first outer annular wall 312 is connected to the outer side of the annular bottom wall. The annular bottom wall, the first inner annular wall 311 and the first outer annular wall 312 surround a device accommodating cavity. The second connecting plate 32 is arranged in an annular shape, and the second connecting plate 32 covers the device accommodating cavity. The single-phase connecting plate 33 is arranged in an umbrella shape. The three single-phase connecting plates 33 are located above the second connecting plate 32 and distributed along the circumferential direction.

[0049] The film capacitor module 34 includes a shell, a capacitor core, a first connecting terminal 341 and a second connecting terminal. The shell is arranged in a ring shape. The shell is provided with an upper ring wall, a lower ring wall, a second inner ring wall and a second outer ring wall. The upper ring wall is located above the lower ring wall, the second inner ring wall is located on the radial inner side and connected between the upper ring wall and the lower ring wall, the second outer ring wall is located on the radial outer side and connected between the upper ring wall and the lower ring wall, the upper ring wall, the lower ring wall, the second inner ring wall and the second outer ring wall form a capacitor ring groove, the capacitor core is arranged in the capacitor ring groove, the capacitor core includes at least two layers of metallized film, the two layers of metallized film are wound around the second inner ring wall, the first connecting The connecting terminal 341 is located on the lower ring wall, the second connecting terminal is located on the lower ring wall, the first connecting terminal 341 and the second connecting terminal are respectively connected to the two layers of metallized film, a plurality of first connecting terminals 341 and a plurality of second connecting terminals are distributed along the circumferential direction, the shell is arranged in the device accommodating cavity, the second inner ring wall is sleeved outside the first inner ring wall 311, the first connecting terminal 341 is connected to the first connecting plate 31, the second outer ring wall is located on the inner side of the first outer ring wall 312, the second connecting plate 32 covers the upper ring wall, the second connecting terminal is connected to the second connecting plate 32, and the first connecting plate 31 is arranged in the annular mounting groove of the shell cover 35

[0050] The first connecting plate 31 is provided with a plurality of first pins along the circumferential direction on the first outer annular wall 312, the second connecting plate 32 is provided with a plurality of second pins along the circumferential direction on the outer edge, the shell cover 35 is provided with an assembly groove 351 in the middle, the shell cover 35 is provided with a fixing block 352 in the assembly groove, the fixing block 352 is provided with a fixing hole, the first connecting plate 31 is provided with a first fixing plate 313 extending inwardly on the first inner annular wall 311, the second connecting plate 32 is provided with a second fixing plate 321 extending inwardly on the inner edge, the first fixing plate 313 and the second fixing plate 321 are fixedly connected to the fixing block 352 respectively.

[0051] Transport Example:

[0052] The vehicle includes a drive assembly as described above, and the drive assembly may be integrated with a transmission or may not be integrated with a transmission. The vehicle may be a new energy electric car, a new energy electric bus, a new energy electric truck, a new energy electric cleaning vehicle, a new energy electric rail vehicle, a new energy electric flying vehicle, a new energy electric shipping vehicle, etc.

[0053] As can be seen from the above, by setting up an independent heat dissipation bridge component, in addition to setting up cooling channels for heat conduction, the heat dissipation bridge component also sets heat conduction surfaces on both sides, so that the power tubes can be set on the heat conduction surfaces on both sides, and the heat dissipation bridge component is set on the periphery of the circuit board module and can be arranged in a ring shape, which not only makes full use of the ring shape space on the periphery of the circuit board module, and increases the number of power devices arranged by using a two-sided arrangement, which is beneficial to improving equipment performance, and uses an independent heat-conducting heat dissipation bridge component to improve the heat dissipation efficiency, so that the performance of the equipment can be more fully released.

[0054] In addition, a ring-shaped wound capacitor core is arranged in an annular shell, and a first connecting terminal and a second connecting terminal are respectively provided on the upper ring wall and the lower ring wall of the shell. Then, the overall annular film capacitor module is placed in the first connecting plate and connected between the first connecting plate and the second connecting plate. Thus, the space of the annular cylindrical first connecting plate can be fully utilized, and a larger capacitor can be arranged in a limited space to improve the performance of the motor controller.

Claims

1. A drive assembly with a heat dissipation bridge arranged in an annular manner, comprising a housing, a stator, a rotor and a motor control device, wherein a liquid cooling channel is arranged on the outer wall of the housing, the housing is surrounded by a motor placement cavity and a control placement cavity, the stator and the rotor are located in the motor placement cavity, the motor control device is located at the axial rear end of the rotor and in the control placement cavity, the motor control device comprises a circuit board module and a power tube module, the circuit board module is located in the middle, and the power tube module is located on the periphery of the circuit board module; Features: The power tube module comprises a heat dissipation bridge component and a plurality of power tubes, the heat dissipation bridge component is arranged on the outer periphery of the circuit board module based on the axis of the rotor, the heat dissipation bridge component is provided with a cooling channel, the heat dissipation bridge component is respectively provided with interface ends at both ends of the extension direction of the cooling channel, the heat dissipation bridge component is provided with heat conduction surfaces on opposite sides of the cooling channel, the plurality of power tubes are distributed on opposite sides of the cooling channel and are thermally connected to the heat conduction surfaces, and the interface ends are communicated with the liquid cooling channel; The inner wall of the housing is provided with a partition wall in the radial direction, the partition wall is located between the motor placement cavity and the control placement cavity, the liquid cooling channel includes a first inner groove arranged in the partition wall, the first inner groove is isolated from the motor placement cavity and the control placement cavity, the interface end faces the partition wall, the interface end is fixedly mounted on the partition wall and communicates with the first inner groove; The heat dissipation bridge assembly includes a heat dissipation bridge and two interface parts. The heat dissipation bridge is arranged along an arc extension or along an arc with multiple obtuse angle bends. The cooling channel is arranged in the heat dissipation bridge. The heat conducting surface is located on the outer walls on both sides of the heat dissipation bridge. The two interface parts are respectively connected to the two ends of the heat dissipation bridge, and the interface end is located on the interface part.

2. The drive assembly according to claim 1, Features: The heat dissipation bridge assembly includes at least two heat dissipation bridges and at least two interface parts, the cooling channel is arranged in the heat dissipation bridge, the heat conducting surface is located on the outer walls on both sides of the heat dissipation bridge, the interface part is provided with two mutually isolated transfer channels, the transfer channel is respectively provided with the interface end and the connection end at both ends, and the heat dissipation bridge is connected between the connection ends of two adjacent interface parts.

3. The drive assembly according to claim 2, Features: The liquid cooling channel further comprises a second inner groove arranged on the outer wall of the housing, the second inner groove is located outside the control placement cavity, an inlet groove is arranged on the outer wall of the housing outside the control placement cavity, and the second inner groove is provided with a diversion rib, and the diversion rib is opposite to the inlet groove; The first inner groove includes at least two sector inner grooves, and the sector inner groove includes a cooling input groove, a cooling output groove and a spacing inner groove. The cooling input groove and the cooling output groove are located on both sides of the spacing inner groove. The cooling input groove is connected with the second inner groove. The cooling channel is connected between the cooling input groove and the cooling output groove. The spacing inner groove is connected with the cooling output groove.

4. The drive assembly according to claim 3, Features: The liquid cooling channel also includes at least two third inner grooves arranged on the outer wall of the housing, the third inner grooves are located outside the motor placement cavity, and the third inner grooves are communicated with the spacing inner grooves.

5. The drive assembly according to claim 2, Features: The heat dissipation bridge assembly comprises three heat dissipation bridges and three interface components; The liquid cooling channel further comprises a second inner groove arranged on the outer wall of the housing, the second inner groove is located outside the control placement cavity, an inlet groove is arranged on the outer wall of the housing outside the control placement cavity, the second inner groove is provided with a flow dividing rib, a flow converging rib and two flow guiding ribs, the flow dividing rib is opposite to the inlet groove; The first inner groove includes three sector inner grooves, the sector inner groove includes a cooling input groove, a cooling output groove and a spacing inner groove, the cooling input groove and the cooling output groove are located on both sides of the spacing inner groove, the cooling input groove is communicated with the second inner groove, the cooling channel is connected between the cooling input groove and the cooling output groove, and the spacing inner groove is communicated with the cooling output groove; The guide length of the guide rib is two-thirds of the width of the second inner groove, the two guide ribs are located on both sides of the diverter rib, the two guide ribs are respectively located at two of the cooling input grooves, the converging rib is located between the two guide ribs and on the opposite side of the diverter rib, and the converging rib faces the other cooling input groove.

6. The drive assembly according to any one of claims 1 to 5, Features: The pins of the power tube are located on the back side of the interface end, and the pins of the power tube are connected to the circuit board module.

7. The drive assembly according to any one of claims 1 to 5, Features: The heat dissipation bridge is made by an extrusion molding process.

8. Transportation, It is characterized in that Comprising a drive assembly as described in any one of claims 1 to 7 above.

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