Motor drive structure and electric vehicle having the same

Abstract

The present application discloses a motor drive structure and an electric vehicle having the motor drive structure, and relates to the field of motor drive technology. The motor drive structure in the present application includes a housing, a rotating shaft is rotatably inserted in the housing, a stator is arranged in the housing, and a rotor corresponding to the stator is sleeved on the rotating shaft; one end of the rotating shaft extends out of the housing and is connected to a reducer, a hollow wheel hub is arranged at one end of the housing, and the reducer is located in the wheel hub; a brake assembly and an encoder assembly are arranged at the other end of the rotating shaft; one end of the wheel hub is rotatably connected to the end of the housing, and the other end of the wheel hub has a first end cover; the reducer includes a primary planetary reduction gear assembly and a secondary planetary reduction gear assembly. The technical solution of the present application realizes the miniaturization and lightweight of the motor drive structure in equipment such as high-power heavy-load electric vehicles; and improves the rigidity and support strength of the motor drive structure, which is stable and reliable.

Description

[0001] This application claims domestic priority, and the priority basis of this application includes: an invention application filed with the State Intellectual Property Office of China with application number 202211386435.5, application date November 7, 2022, and patent name “A motor drive structure and an electric vehicle having the motor drive structure”. Technical Field

[0002] The present application relates to the field of motor drive technology, and in particular to a motor drive structure and an electric vehicle having the motor drive structure. Background Art

[0003] The motor drive structure that uses electricity as the driving force is a new energy drive method that is currently widely promoted and applied. With the improvement of people's environmental awareness and production technology level, its application scope is becoming wider and wider. For example, in electric vehicles, lawn mowers, hedge trimmers, electric forklifts and other equipment, more and more motor drive structures are used to realize the walking drive of related equipment.

[0004] A common motor drive structure is a "two-in-one electric drive assembly" composed of a drive motor and a reducer, or a "three-in-one electric drive assembly" composed of a drive motor, a reducer and a brake device; with the increasing application of electric drive wheels, the requirements for how to increase power and reduce volume, how to increase bearing capacity and support strength are becoming higher and higher; especially for some specific working conditions, such as how to change the original other drives into a motor drive structure within the original space, or how to further improve the power density of the motor drive structure within the original space, have become the goals pursued by these "two-in-one electric drive assemblies" and "three-in-one electric drive assemblies".

[0005] For two-wheeled electric vehicles or light-loaded multi-wheeled equipment, the use of hub motors can save installation space for the entire drive structure; however, for special working conditions (such as lawn mowers) and multi-wheeled equipment with large loads, the use of conventional hub motors has problems such as poor heat dissipation, bumps that easily lead to damage to internal components, short service life, poor support and load-bearing capacity, and difficulty in reducing unsprung mass, resulting in poor comfort.

[0006] Other wheel-side motor drive structures designed in the related art require a large installation space and lack stability and reliability in supporting the overall equipment. Summary of the invention

[0007] In order to improve the stability and reliability of a motor drive structure in an electric vehicle, the present application provides a motor drive structure and an electric vehicle having the motor drive structure.

[0008] In the first aspect, the present application provides a motor drive structure adopting the following technical solution:

[0009] A motor drive structure, comprising a housing, a rotating shaft rotatably inserted in the housing, a stator arranged in the housing, a rotor corresponding to the stator sleeved on the rotating shaft; one end of the rotating shaft extends out of the housing and is connected to a reducer, a hollow wheel hub is arranged at one end of the housing, and the reducer is located in the wheel hub; a brake assembly and an encoder assembly are arranged at the other end of the rotating shaft;

[0010] One end of the wheel hub is rotatably connected to the end of the housing, and the other end of the wheel hub has a first end cover;

[0011] The reducer comprises a primary planetary reduction gear assembly and a secondary planetary reduction gear assembly; the primary planetary reduction gear assembly is located at one end of the wheel hub ring close to the first end cover, and the secondary planetary reduction gear assembly is located at one end of the wheel hub ring close to the housing; the output end of the primary planetary reduction gear assembly is connected to the input end of the secondary planetary reduction gear assembly, and the output end of the secondary planetary reduction gear assembly is connected to the wheel hub ring and can drive the wheel hub ring to rotate;

[0012] The first-stage planetary reduction gear assembly comprises a first-stage planet carrier, a first-stage sun gear fixedly mounted on the end of the rotating shaft, a first-stage inner gear ring fixedly mounted on the inner wall of the wheel hub ring, and a plurality of first-stage planetary gears rotatably mounted in the first-stage planet carrier, and all the first-stage planetary gears are meshed with the first-stage sun gear and the first-stage inner gear ring at the same time;

[0013] One end of the first-stage planet carrier is rotatably connected to the first end cover via a first bearing;

[0014] The secondary planetary reduction gear assembly comprises a secondary planet carrier, a secondary sun gear sleeved on the rotating shaft, a secondary inner gear ring fixedly mounted on the inner wall of the wheel hub ring, and a plurality of secondary planetary gears rotatably arranged in the secondary planet carrier, and all the secondary planetary gears are meshed with the secondary sun gear and the secondary inner gear ring at the same time;

[0015] There is a gap between the inner wall of the secondary sun gear and the outer peripheral surface of the rotating shaft, and the other end of the primary planet carrier is fixedly connected to the secondary sun gear;

[0016] One end of the secondary planet carrier is rotatably connected to the hub ring and the primary planet carrier at inner and outer sides respectively, and the other end of the secondary planet carrier is fixedly connected to the casing.

[0017] By adopting the above technical solution, the housing of the motor drive structure is directly fixed to the frame, the tire is installed on the wheel hub, and a motor drive structure is installed on each of the two rear wheels of the electric vehicle, lawn mower and other equipment, and the two motor drive structures are driven independently. The wheel hub at one end of the housing is used to install the rim and tire. The wheel hub has a wide width and is particularly suitable for load-bearing tires with heavy loads or high driving power; the reducer is arranged in the wheel hub, which makes reasonable use of the space.

[0018] The reducer in the present application is a two-stage reduction mechanism with a high reduction ratio, and the transmission ratio can reach 15:1 to 55:1. Under the same volume, it can achieve higher torque output; the rotor and the stator cooperate to generate an electromagnetic driving force to drive the rotating shaft to rotate, and the rotating shaft is decelerated by the two-stage reduction mechanism and then transmitted to the wheel hub, thereby driving the wheel tire to rotate; the first-stage planetary reduction gear assembly is located at the end of the wheel hub away from the stator and the rotor, and the second-stage planetary reduction gear assembly is located at the end of the wheel hub close to the stator and the rotor. The output end of the rotating shaft first passes through the second-stage planetary reduction gear assembly and then transmits to the first-stage planetary reduction gear assembly. In this way, the position where the torque is finally transmitted to the wheel tire is closer to the middle position of the entire motor drive structure, and the bearing capacity of the entire motor drive structure is more stable and the support strength is higher. At the same time, both ends of the first-stage planetary carrier of the first-stage planetary reduction gear assembly in the present application are effectively supported, which improves the rigidity and support strength of the first-stage planetary carrier, thereby ensuring the stability of torque transmission and further improving the support strength of the entire motor drive structure.

[0019] Optionally, a second end cover is fixedly provided at one end of the casing away from the wheel hub ring, and a partition is also fixedly provided at a position between the stator and the second end cover in the casing, the end of the rotating shaft passes through the partition and extends into the cavity between the second end cover and the partition, the brake assembly is located in the cavity between the second end cover and the partition and the brake assembly is sleeved on the end of the rotating shaft.

[0020] By adopting the above technical solution, the brake assembly is arranged at an inner position closer to electric vehicles and other equipment to brake them. The entire spatial layout is convenient for space utilization of the overall equipment and for circuit layout, thereby improving compactness. By arranging the brake assembly in an independent space formed by the second end cover and the partition, it is effectively protected and the service life of the entire motor drive structure is improved.

[0021] Optionally, the brake assembly includes an electromagnetic brake, which includes a yoke assembly, a spline wheel fixed to the end of the rotating shaft, and a friction plate that cooperates with the spline wheel and is circumferentially fixed; the brake assembly also includes an arc plate for manually releasing the electromagnetic brake.

[0022] By adopting the above technical solution, the electromagnetic brake is easy to use, stable and reliable, with a compact structure and easy installation. The electromagnetic brake in this application can be a spring-pressurized electromagnetic power-off brake, that is, a friction plate brake in which the spring exerts pressure to generate friction torque when the power is off and is released (i.e., disengaged) when the power is on. It can achieve rapid parking and accurate positioning, and can achieve safe braking when the power is off, thereby improving safety; by setting an arc plate, manual emergency release of the brake can be achieved in special conditions such as loss of points.

[0023] Optionally, a first mounting hole is provided in the middle portion of the second end cover, one end of the electromagnetic brake is installed in the first mounting hole and the other end of the electromagnetic brake faces the cavity between the second end cover and the partition; a second mounting hole is provided in the middle portion of the electromagnetic brake; one end of the encoder assembly is arranged in the second mounting hole, and the other end of the encoder assembly is sleeved on the end portion of the rotating shaft.

[0024] By adopting the above technical solution, the encoder assembly is used to monitor the rotational speed and other information of the motor drive structure in real time. The above structure improves the convenience of installing the brake assembly and the encoder assembly, and further improves the compactness of the motor drive structure.

[0025] Optionally, a first step is provided on the inner wall of the housing, and one side of the outer peripheral edge of the partition plate abuts against the step surface of the first step; the outer peripheral edge of the partition plate is fixedly connected to the step surface of the first step by a first fastening bolt;

[0026] The side surface of the partition plate has a first annular protrusion, and the side surface of the first annular protrusion is in contact with the inner wall of the housing at the first step;

[0027] The middle part of the partition has a cylindrical portion on one side facing the stator and the rotor, the rotating shaft passes through the cylindrical portion, and the rotating shaft and the cylindrical portion are rotatably connected via a second bearing;

[0028] A plurality of reinforcing ribs are provided between the outer peripheral surface of the cylinder and the side surface of the partition.

[0029] By adopting the above technical solution, both ends of the shaft are strongly supported, the rotation of the shaft is more stable and reliable, and the partition positioning is accurate and reliable, and the installation is firm.

[0030] Optionally, the end of the housing has a second step, the second end cover has a second annular protrusion on a side facing the stator and the rotor, the second annular protrusion abuts against the second step, and a sealing ring is further provided between the second annular protrusion and the second step;

[0031] The second end cover is fixedly connected to the partition plate by second fastening bolts.

[0032] By adopting the above technical solution, the installation and positioning of the second end cover is accurate and reliable, and the connection is stable. It can also effectively prevent foreign matter such as oil, water, and dust from entering the motor.

[0033] Optionally, the outer circumferential surface of the casing has a first annular flange for being fixedly connected to the frame, the first annular flange is provided with a plurality of first connecting holes, the outer circumferential surface of the casing also has a plurality of heat dissipation ribs, the length direction of the heat dissipation ribs is arranged along the axial direction of the casing, and the plurality of heat dissipation ribs are distributed at intervals along the circumference of the casing; one end of the heat dissipation rib is fixedly connected to the side of the first annular flange.

[0034] By adopting the above technical solution, the heat dissipation rib plate can not only play the role of motor heat dissipation, but also play the role of strengthening the casing support, thereby improving the supporting strength and structural rigidity of the entire motor drive structure.

[0035] Optionally, the housing has a third end cover at one end close to the hub ring, the rotating shaft passes through the third end cover and the rotating shaft and the third end cover are rotatably connected via a third bearing; a first dynamic sealing ring is also provided between the rotating shaft and the hole wall of the third end cover; the first dynamic sealing ring is located on the side of the third bearing facing the reducer.

[0036] By adopting the above technical solution, the supporting effect of the third bearing between the rotating shaft and the third end cover ensures the stable and reliable operation of the rotating shaft. At the same time, the third bearing and the third end cover are sealed by the first dynamic sealing ring to prevent the lubricating oil in the transmission from flowing into the interior of the drive motor, thereby ensuring the insulation and pressure resistance reliability of the drive motor.

[0037] Optionally, the outer peripheral surface of the hub ring is provided with a second annular flange for being fixedly connected to the wheel rim, and the second annular flange is provided with a plurality of second connecting holes;

[0038] The second annular flange will abut against the end face of the casing, the outer side of the third end cover has an annular mounting groove, the end of the hub ring is inserted into the annular mounting groove, and a second dynamic sealing ring is provided between the inner wall of the end of the hub ring and the groove wall of the annular mounting groove.

[0039] By adopting the above technical solution, the second annular flange is convenient for installing the wheel tire. The second annular flange is close to the housing, so that the center of gravity of the wheel tire after installation is located in the middle of the entire motor drive structure, which is convenient for better bearing. By setting the second dynamic sealing ring, independent sealing is achieved inside the wheel hub ring, effectively preventing leakage of lubricating oil.

[0040] Optionally, the inner side of the first end cover has an annular mounting groove, the first bearing is embedded in the mounting groove and the outer ring of the first bearing is tightly matched with the groove wall of the mounting groove, and the inner ring of the first bearing is sleeved on the outer circumferential surface of one end of the first-stage planet carrier;

[0041] The other end of the primary planet carrier is sleeved on one end of the secondary sun gear, and the end of the secondary planet carrier is sleeved on the end of the primary planet carrier, and the two are rotatably connected via a fourth bearing.

[0042] Optionally, fifth bearings are provided on both sides of the secondary internal gear ring in the casing, and both sides of the outer periphery of the secondary planetary carrier are rotatably connected to the casing through a corresponding fifth bearing.

[0043] By adopting the above technical solution, the first-stage planetary carrier and the second-stage planetary carrier are effectively supported in multiple ways, which ensures the stability and reliability of the torque output of the reducer, while improving the supporting strength of the entire motor drive structure.

[0044] In the second aspect, the electric vehicle provided by the present application having the above motor drive structure adopts the following technical solution:

[0045] An electric vehicle comprises a frame, wheels and tires and the above-mentioned motor drive structure, wherein a housing in the motor drive structure is fixedly connected to the frame, and the wheels and tires are sleeved on a wheel hub in the motor drive structure.

[0046] In the present application, the motor drive structure can not only play the conventional motor drive role, but also play the role of wheel hub support; the casing is fixedly connected to the frame, the tire is installed on the wheel hub rim, and a motor drive structure is installed corresponding to the two rear wheels or the two front wheels or each front and rear wheel, and the two motor drive structures are driven independently.

[0047] In the present application, the drive, transmission and braking are integrated into the motor drive structure assembly, and the spatial position is reasonably arranged, and the transmission components such as the clutch, transmission, drive shaft, differential, transfer case, etc. are omitted, which can effectively simplify the chassis structure of equipment such as electric vehicles, ensure its compactness, and achieve the miniaturization and lightweight of the motor drive structure in equipment such as high-power and heavy-load electric vehicles; and improve the installation flexibility of the electric drive wheel. The electric vehicle in the present application can achieve true real-time all-wheel drive, have differential steering functions, etc., and is easy to operate, stable and reliable.

[0048] In summary, the present application includes at least one of the following beneficial technical effects:

[0049] 1. The wheel hub at one end of the motor drive structure casing in the present application is used to install the rim and tire. The wheel hub has a wider width and is particularly suitable for load-bearing tires with heavy loads or high driving power. The reducer is arranged in the wheel hub, which makes reasonable use of the space, makes the overall structure compact, and saves installation space.

[0050] 2. In the present application, the output end of the rotating shaft first passes through the secondary planetary reduction gear assembly and then is transmitted to the primary planetary reduction gear assembly, so that the position where the torque is finally transmitted to the wheel tire is closer to the middle position of the entire motor drive structure, and the bearing capacity of the entire motor drive structure is more stable and the supporting strength is higher.

[0051] 3. In the present application, both the first-stage planetary carrier and the second-stage planetary carrier of the first-stage planetary reduction gear assembly adopt a multiple support structure, in which both ends of the first-stage planetary carrier are effectively supported. Compared with the original structure in which one end of the first-stage planetary carrier is suspended in the air, this technical solution improves the rigidity and support strength of the first-stage planetary carrier, thereby ensuring the stability of torque transmission and improving the support strength of the entire motor drive structure.

[0052] 4. The installation and positioning of the second end cover and the partition in the present application are accurate and reliable, the connection is firm, and the brake assembly and the encoder assembly are easy to assemble.

[0053] 5. In this application, the drive, transmission and braking are integrated into the motor drive structure assembly, and the spatial position is reasonably arranged, omitting the transmission components such as the clutch, transmission, drive shaft, differential, transfer case, etc., which can effectively simplify the chassis structure of the electric vehicle, ensure its compactness, and realize the miniaturization and lightweight of the motor drive structure in high-power and heavy-load electric vehicles.

[0054] 6. In the present application, the housing of the motor drive structure is directly fixed to the vehicle frame, the tire is mounted on the wheel hub, and a motor drive structure is installed on each of the two rear wheels of an electric vehicle, lawn mower or other equipment, and the two motor drive structures are driven independently; true real-time all-wheel drive can be achieved, with differential steering function, etc., which is easy to operate, stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a first three-dimensional structural schematic diagram of the motor drive structure.

[0056] Figure 2 It is a second three-dimensional structural schematic diagram of the motor drive structure.

[0057] Figure 3 It is a first cross-sectional structural schematic diagram of the motor drive structure.

[0058] Figure 4 yes Figure 3 Schematic diagram of the local enlarged structure at point A in the middle.

[0059] Figure 5 yes Figure 3 Schematic diagram of the local enlarged structure at point B in the middle.

[0060] Figure 6 It is a second cross-sectional structural schematic diagram of the motor drive structure.

[0061] Figure 7 yes Figure 6 Schematic diagram of the local enlarged structure at point C in the middle.

[0062] Figure 8 It is a first three-dimensional structural schematic diagram of a primary planetary carrier in the motor drive structure.

[0063] Fig. 9 It is a second three-dimensional structural schematic diagram of the first-stage planetary carrier in the motor drive structure.

[0064] Fig.10 This is a schematic diagram of the installation and use structure of the motor drive structure in Example 2.

[0065] Fig.11 This is a schematic diagram of the motor drive structure coordination connection structure in Example 3.

[0066] Fig.12 This is a schematic diagram of the motor drive structure coordination connection structure in Example 4.

[0067] In the figure, 1, housing; 1a, first step; 1b, second step; 1c, first annular flange; 1c1, first connecting hole; 1d, heat dissipation rib plate; 2, rotating shaft; 3, stator; 4, rotor; 5, reducer; 51, first-stage planetary reduction gear assembly; 511, first-stage planet carrier; 5111, annular ring; 5111a, through hole; 5111b, mounting groove; 5111c, pin hole; 5112, first mounting cylinder; 5113, second mounting cylinder; 5114, first annular platform step; 5115, second annular step; 5116, arc groove; 5117, rectangular groove; 512, primary sun gear; 513, primary inner gear ring; 514, primary planetary gear; 52, secondary planetary reduction gear assembly; 521, secondary planet carrier; 522, secondary sun gear; 5221, abutting step; 5222, retaining ring; 523, secondary inner gear ring; 524, secondary planetary gear; 6, wheel hub; 61, second annular flange; 61a, second connecting hole; 7, brake assembly; 71, electromagnetic brake; 711, yoke assembly; 712, spline wheel; 713, friction plate; 714, arc plate; 8, encoder assembly; 9, first end cover; 91, mounting groove; 10, first bearing; 11, second end cover; 11a, second annular protrusion; 12, partition; 12a, first annular protrusion; 12b, cylinder body; 12c, reinforcing rib plate; 13, first fastening bolt; 14, second bearing; 15, sealing ring; 16, second fastening bolt; 17, third end cover; 17a, annular mounting groove; 18, third bearing; 19, first dynamic sealing ring; 20, second dynamic sealing ring; 21, fourth bearing; 22, fifth bearing; 23, vehicle frame; 24, wheel tire; 25, mounting seat; 26, first bevel gear; 27, second bevel gear; 28, drive shaft; 29, transmission shaft; 30, connecting shaft; 31, first clutch; 32, bevel gear; 33, universal joint; 34, second clutch; 35, tire rim; 36, third clutch; 37, universal joint shaft. DETAILED DESCRIPTION

[0068] The following is combined with Figure 1 -Attached Fig.12 , further details of this application are given.

[0069] Example 1

[0070] For some specific powertrains, especially electric drive assemblies that require high power, the installation space of the drive assembly in the air is extremely limited, and no more space can be obtained in the axial dimension. Therefore, for this kind of narrow space, it is not easy to realize the "three-in-one electric drive assembly" that integrates the reducer with the drive motor and the brake assembly. In addition to considering the structural size, it is also necessary to consider the overall structural strength, transmission efficiency, and how to lubricate and seal, which are all very difficult to achieve. In the limited space where the axial position is difficult to expand outward, it is a difficult point worth improving to not only integrate the brake assembly and reducer into the drive motor assembly, but also to further improve the power density, achieve high power heavy load and ensure sufficient support strength.

[0071] The motor drive structure of the present application sets the reducer 5 at a position close to the outer end of the electric vehicle, the drive motor is set in the middle, and the brake assembly 7 is set at a position close to the inner end of the electric vehicle. Specifically, refer to Figure 1 and Figure 2 The motor drive structure includes a housing 1, and the housing 1 has a first annular flange 1c on its outer circumference for being fixedly connected to the vehicle frame. The first annular flange 1c is provided with a plurality of first connection holes 1c1. The housing 1 also has a plurality of heat dissipation ribs 1d on its outer circumference. The length direction of the heat dissipation ribs 1d is arranged along the axial direction of the housing 1, and the plurality of heat dissipation ribs 1d are distributed at intervals along the circumference of the housing 1. One end of the heat dissipation rib 1d is fixedly connected to the side of the first annular flange 1c. The heat dissipation rib 1d can not only play the role of heat dissipation of the motor, but also play the role of strengthening the supporting strength of the housing 1, thereby improving the supporting strength and structural rigidity of the entire motor drive structure. A hollow wheel hub 6 is arranged at one end of the housing 1, and the wheel hub 6 is rotatably arranged at the end of the housing 1. A brake assembly 7 and an encoder assembly 8 are arranged at the other end of the housing 1. The housing 1 of the motor drive structure is directly fixedly connected to the vehicle frame, and the tire is installed on the wheel hub 6. A motor drive structure is respectively installed on the two rear wheels of the electric vehicle, lawn car and other equipment, and the two motor drive structures are driven independently. The wheel hub 6 at one end of the housing 1 is used to mount a wheel rim and a tire. The wheel hub 6 has a relatively wide width and is particularly suitable for a load-bearing tire with a heavy load or high driving power.

[0072] Reference Figure 1 and Figure 3 A rotating shaft 2 is rotatably inserted in the casing 1, a stator 3 is arranged in the casing 1, and a rotor 4 corresponding to the stator 3 is sleeved on the rotating shaft 2; one end of the rotating shaft 2 extends out of the casing 1 and is connected to a reducer 5, and the reducer 5 is located in the wheel hub 6, which reasonably utilizes the space; the brake assembly 7 and the encoder assembly 8 are both sleeved on the other end of the rotating shaft 2.

[0073] Reference Figure 2 and Figure 3One end of the hub ring 6 is rotatably connected to the end of the casing 1, and the other end of the hub ring 6 has a first end cover 9; a second end cover 11 is fixedly provided at one end of the casing 1 away from the hub ring 6, and a partition plate 12 is also fixedly provided at a position between the stator 3 and the second end cover 11 in the casing 1, and the end of the rotating shaft 2 passes through the partition plate 12 and extends into the cavity between the second end cover 11 and the partition plate 12.

[0074] Reference Figure 3 and Figure 4 A first step 1a is provided on the inner wall of the casing 1, and one side of the outer peripheral edge of the partition 12 abuts against the step surface of the first step 1a; the outer peripheral edge of the partition 12 is fixedly connected to the step surface of the first step 1a by a first fastening bolt 13; the side of the partition 12 has a first annular protrusion 12a, and the side of the first annular protrusion 12a abuts against the inner wall of the casing 1 at the first step 1a; the middle part of the partition 12 has a cylindrical portion 12b on the side facing the stator 3 and the rotor 4, the rotating shaft 2 passes through the cylindrical portion 12b, and the rotating shaft 2 and the cylindrical portion 12b are rotatably connected by a second bearing 14; a number of reinforcing ribs 12c are also provided between the outer peripheral surface of the cylindrical portion 12b and the side of the partition 12. In the present application, both ends of the rotating shaft 2 are strongly supported, the rotation of the rotating shaft 2 is more stable and reliable, and the positioning of the partition 12 is accurate and reliable, and the installation is firm.

[0075] Reference Figure 3 and Figure 4 The end of the casing 1 has a second step 1b, and the second end cover 11 has a second annular protrusion 11a on the side facing the stator 3 and the rotor 4. The second annular protrusion 11a abuts against the second step 1b, and a sealing ring 15 is also provided between the second annular protrusion 11a and the second step 1b; the second end cover 11 is fixedly connected to the partition 12 by a second fastening bolt 16, so that the installation positioning of the second end cover 11 is accurate and reliable, the connection is firm, and it can effectively prevent foreign matter such as oil, water, and dust from entering the interior of the motor.

[0076] Reference Figure 4 and Figure 5 As shown, the brake assembly 7 is located in the cavity between the second end cover 11 and the partition 12 and the brake assembly 7 is sleeved on the end of the rotating shaft 2; the brake assembly 7 is arranged at an inner position closer to the electric vehicle and other equipment for braking it, and the entire spatial layout is convenient for the space utilization of the overall equipment and the layout of the circuit, thereby improving the compactness; by arranging the brake assembly 7 in the independent space formed by the second end cover 11 and the partition 12, it is effectively protected and the service life of the entire motor drive structure is improved.

[0077] Further, combined with Figure 3 and Figure 5As shown, the brake assembly 7 includes an electromagnetic brake 71, which includes a yoke assembly 711, a spline wheel 712 fixed at the end of the rotating shaft 2, and a friction plate 713 matched with the spline wheel 712 and circumferentially fixed; the brake assembly 7 also includes an arc plate 714 for manually releasing the electromagnetic brake 71; the electromagnetic brake 71 is easy to use, stable and reliable, with a compact structure and easy installation. The electromagnetic brake 71 in the present application can be a spring-pressurized electromagnetic power-off brake, that is, a friction plate 713 brake that generates friction torque when the power is off and is released (i.e. disengaged) when the power is on, which can achieve rapid parking and accurate positioning, and can achieve safe braking when the power is off, thereby improving safety; by setting the arc plate 714, manual emergency release of the brake can be achieved under special conditions such as loss of power. A first mounting hole is provided in the middle of the second end cover 11, one end of the electromagnetic brake 71 is installed in the first mounting hole and the other end of the electromagnetic brake 71 faces the cavity between the second end cover 11 and the partition 12; a second mounting hole is provided in the middle of the electromagnetic brake 71; one end of the encoder assembly 8 is arranged in the second mounting hole, and the other end of the encoder assembly 8 is sleeved on the end of the rotating shaft 2; the encoder assembly 8 is used to monitor the rotational speed and other information of the motor drive structure in real time. The above structure improves the convenience of installation of the brake assembly 7 and the encoder assembly 8, and further improves the compactness of the motor drive structure.

[0078] Reference Figure 6 and Figure 7 The end of the casing 1 close to the hub ring 6 is provided with a third end cover 17, the rotating shaft 2 passes through the third end cover 17, and the rotating shaft 2 and the third end cover 17 are rotatably connected through a third bearing 18; a first dynamic sealing ring 19 is also provided between the rotating shaft 2 and the hole wall of the third end cover 17; the first dynamic sealing ring 19 is located on the side of the third bearing 18 facing the reducer 5; the supporting effect of the third bearing 18 between the rotating shaft 2 and the third end cover 17 ensures the stable reliability of the operation of the rotating shaft 2, and at the same time, the third bearing 18 and the third end cover 17 are sealed by the first dynamic sealing ring 19 to prevent the lubricating oil in the transmission from flowing into the interior of the drive motor, thereby ensuring the insulation and pressure resistance reliability of the drive motor.

[0079] Reference Figure 2 and Figure 7The outer circumference of the wheel hub 6 is provided with a second annular flange 61 for fixing with the wheel rim, and the second annular flange 61 is provided with a plurality of second connection holes 61a; the second annular flange 61 will abut against the end surface of the housing 1, and the outer side of the third end cover 17 is provided with an annular mounting groove 17a, and the end of the wheel hub 6 is inserted into the annular mounting groove 17a, and a second dynamic sealing ring 20 is provided between the inner wall of the end of the wheel hub 6 and the groove wall of the annular mounting groove 17a. The second annular flange 61 is convenient for installing the wheel tire, and the second annular flange 61 is close to the housing 1, so that the center of gravity of the wheel tire after installation is located in the middle of the entire motor drive structure, which is convenient for better bearing. By providing the second dynamic sealing ring 20, the independent sealing inside the wheel hub 6 is realized, and the leakage of lubricating oil is effectively prevented.

[0080] In the present application, the third end cover 17 at one end of the casing 1 is integrally formed with the barrel portion of the casing 1, and the second end cover 11 and the partition 12 at the other end of the casing 1 are detachably fixed to the barrel portion of the casing 1, which facilitates the assembly of the overall structure and ensures its stability and reliability. Specifically, during assembly, the stator is first installed into the interior of the casing 1 from the end away from the third end cover 17, and then the shaft 2 with the rotor 4 is inserted, and then the partition 12 part is installed. The relative position of the partition 12 and the casing 1 is positioned and limited by the first step 1a set at the end of the casing 1 and the first annular protrusion 12a set on the side of the partition 12, and then a circle of first fastening bolts 13 are set on the outer peripheral edge of the partition 12 to fix the partition 12 on the step surface of the first step 1a, thereby achieving precise assembly and connection; a cylindrical body 12b and a reinforcing rib plate 12c are set in the middle of the partition 12 for assembly and support with the shaft 2, thereby ensuring the supporting strength of the partition 12 and the stable reliability of the shaft 2 after installation. Finally, the brake assembly 7, the encoder assembly 8 and the second end cover 11 are installed in sequence. The brake assembly 7 and the encoder assembly 8 are first assembled on the second end cover 11, and then assembled together to the end of the housing 1 and the rotating shaft 2. The second step 1b is provided at the end of the housing 1 and the second annular protrusion 11a is provided on the second end cover 11, so as to achieve the assembly and matching of the two. The sealing ring 15 and a plurality of second fastening bolts 16 are combined to achieve the precise positioning and limiting of the second end cover 11, and maintain a stable sealing connection. The entire structural design facilitates the smooth progress of the assembly process, and reduces the difficulty of the assembly process while ensuring the compact structure, structural connection strength, support strength and sealing.

[0081] Reference Figure 6 and Figure 7The reducer 5 includes a primary planetary reduction gear assembly 51 and a secondary planetary reduction gear assembly 52; the primary planetary reduction gear assembly 51 includes a primary planet carrier 511, a primary sun gear 512 fixed to the end of the rotating shaft 2, a primary inner gear ring 513 fixed to the inner wall of the hub ring 6, and a plurality of primary planetary wheels 514 rotatably arranged in the primary planet carrier 511. In this embodiment, the number of primary planetary wheels 514 is usually set to 3, and can also be set to 4; all primary planetary wheels 514 are meshed with the primary sun gear 512 and the primary inner gear ring 513 at the same time; one end of the primary planet carrier 511 is rotatably connected to the first end cover 9 through the first bearing 10; the secondary planetary gear 514 is rotatably connected to the first end cover 9 through the first bearing 10; The planetary reduction gear assembly 52 includes a secondary planetary carrier 521, a secondary sun gear 522 sleeved on the rotating shaft 2, a secondary internal gear ring 523 fixed on the inner wall of the hub ring 6, and a plurality of secondary planetary gears 524 rotatably arranged in the secondary planetary carrier 521, all of the secondary planetary gears 524 are meshed with the secondary sun gear 522 and the secondary internal gear ring 523 at the same time; there is a gap between the inner wall of the secondary sun gear 522 and the outer peripheral surface of the rotating shaft 2, and the other end of the primary planetary carrier 511 is fixedly connected to the secondary sun gear 522; the inner and outer sides of one end of the secondary planetary carrier 521 are respectively rotatably connected to the hub ring 6 and the primary planetary carrier 511, and the other end of the secondary planetary carrier 521 is fixedly connected to the casing 1.

[0082] Reference Figure 7 and Figure 8 The first-stage planet carrier 511 includes an annular ring 5111 with a through hole 5111a in the middle, the rotating shaft 2 is inserted into the through hole 5111a, and the first-stage sun gear 512 fixedly arranged at the end of the rotating shaft 2 is located in the through hole 5111a. A plurality of mounting grooves 5111b are provided on the outer peripheral surface of the annular ring 5111, and the mounting grooves 5111b are connected to the through hole 5111a. The plurality of mounting grooves 5111b are evenly spaced along the circumference of the annular ring 5111, and the number of the mounting grooves 5111b matches the number of the first-stage planet gears 514. Each first-stage planetary gear 514 is installed in a corresponding installation groove 5111b, and there are pin holes 5111c on the groove walls on both sides of the installation groove 5111b. A connecting pin is connected to the middle of each first-stage planetary gear 514, and the two ends of the connecting pin are respectively inserted into the pin holes 5111c on the groove walls on both sides of the installation groove 5111b; a part of the first-stage planetary gear 514 penetrates into the through hole 5111a and meshes with the first-stage sun gear 512, and a part of the first-stage planetary gear 514 extends out of the installation groove 5111b and meshes with the first-stage inner gear ring 513.

[0083] Reference Figure 7The inner side of the first end cover 9 has an annular mounting groove 91, the first bearing 10 is embedded in the mounting groove 91 and the outer ring of the first bearing 10 is tightly matched with the groove wall of the mounting groove 91, and the inner ring of the first bearing 10 is sleeved on the outer peripheral surface of one end of the primary planet carrier 511; the other end of the primary planet carrier 511 is sleeved on one end of the secondary sun gear 522, and the end of the secondary planet carrier 521 is sleeved on the end of the primary planet carrier 511 and the two are rotatably connected through the fourth bearing 21. The fifth bearing 22 is provided on both sides of the secondary inner gear ring 523 in the housing 1, and the outer sides of the secondary planet carrier 521 are rotatably connected to the housing 1 through a corresponding fifth bearing 22; the primary planet carrier 511 and the secondary planet carrier 521 are supported by multiple effective supports, which ensures the stability and reliability of the torque output of the reducer 5, and at the same time improves the support strength of the entire motor drive structure.

[0084] Reference Figure 8 and Fig. 9 The end surfaces of both sides of the annular ring 5111 are respectively provided with an integrally formed first mounting cylinder 5112 and a second mounting cylinder 5113, the first mounting cylinder 5112 and the second mounting cylinder 5113 are both coaxially arranged with the through hole 5111a, the inner diameter of the first mounting cylinder 5112 is larger than the outer diameter of the second mounting cylinder 5113, the inner ring of the first bearing 10 is sleeved on the outer circumferential surface of the first mounting cylinder 5112, and the inner ring of the fourth bearing 21 is sleeved on the outer circumferential surface of the second mounting cylinder 5113; the end surface of the annular ring 5111 is aligned with the first mounting cylinder 5112. The connection between the mounting cylinder 5112 and the second mounting cylinder 5113 is provided with a first annular step 5114, one end of the inner ring of the first bearing 10 is in contact with the step surface of the first annular step 5114, and a gap is formed between the outer ring end of the first bearing 10 and the end surface of the annular ring 5111; the connection between the other end surface of the annular ring 5111 and the second mounting cylinder 5113 is provided with a second annular step 5115, one end of the inner ring of the fourth bearing 21 is in contact with the step surface of the second annular step 5115, and a gap is formed between the outer ring end of the fourth bearing 21 and the end surface of the annular ring 5111. The first annular step 5114 and the first mounting cylinder 5112 are provided with an arc-shaped groove 5116 corresponding to the pin hole 5111c. At least two rectangular grooves 5117 are formed on the inner wall of the second mounting cylinder 5113, and the two ends of the rectangular grooves 5117 pass through the two ends of the second mounting cylinder 5113, and all the rectangular grooves 5117 are spaced apart along the circumference of the second mounting cylinder 5113; combined with Figure 7As shown, one end of the secondary sun gear 522 is inserted into the second mounting cylinder 5113 and a limit block is fixedly provided on the outer peripheral surface of the end of the secondary sun gear 522, and the limit block is embedded in the rectangular groove 5117, so that a circumferential limit can be formed between the second mounting cylinder 5113 and the secondary sun gear 522, so that the secondary sun gear 522 is driven to rotate by the primary planetary carrier 511; an abutment step 5221 is provided on the secondary sun gear 522, and a retaining ring 5222 is also clamped at the end of the secondary sun gear 522, and the second mounting cylinder 5113 is located between the abutment step 5221 and the retaining ring 5222, one end of the second mounting cylinder 5113 is abutted against the abutment step 5221, and the other end is abutted against the retaining ring 5222.

[0085] The implementation principle is as follows: the reducer 5 in the present application is a two-stage reduction mechanism with a high reduction ratio, and the transmission ratio can reach 15:1 to 55:1. Under the same volume, it can achieve higher torque output; the rotor 4 and the stator 3 cooperate to generate an electromagnetic driving force to drive the rotating shaft 2 to rotate, and the rotating shaft 2 is decelerated by the two-stage reduction mechanism and then transmitted to the wheel hub 6, thereby driving the wheel tire to rotate; the first-stage planetary reduction gear assembly 51 is located at the end of the wheel hub 6 away from the stator 3 and the rotor 4, and the second-stage planetary reduction gear assembly 52 is located at the end of the wheel hub 6 close to the stator 3 and the rotor 4. The output end of the rotating shaft 2 first passes through the second-stage planetary reduction gear assembly 52 and then transmits to the first-stage planetary reduction gear assembly 51. In this way, the position where the torque is finally transmitted to the wheel tire is closer to the middle position of the entire motor drive structure, and the bearing capacity of the entire motor drive structure is more stable and the supporting strength is higher. At the same time, in the present application, both ends of the first-stage planetary carrier 511 of the first-stage planetary reduction gear assembly 51 are effectively supported, which improves the rigidity and supporting strength of the first-stage planetary carrier 511, thereby ensuring the stability of torque transmission and further improving the supporting strength of the entire motor drive structure.

[0086] Example 2

[0087] Reference Fig.10 This embodiment discloses an electric vehicle, including a frame 23, a wheel tire 24 and the motor drive structure in the above-mentioned embodiment 1, wherein the housing 1 in the motor drive structure is fixedly connected to the frame 23, and the wheel tire 24 is mounted on the wheel hub 6 in the motor drive structure.

[0088] The implementation principle is as follows: in addition to the conventional motor driving function, the motor drive structure in the present application can also play the role of wheel hub support; the housing 1 is fixedly connected to the frame 23, the wheel tire 24 is installed on the wheel hub 6, and a motor drive structure is installed corresponding to the two rear wheels or the two front wheels or each front and rear wheel, and the two motor drive structures are driven independently.

[0089] In the present application, the drive, transmission and braking are integrated into the motor drive structure assembly, and the spatial position is reasonably arranged, and the transmission components such as the clutch, transmission, drive shaft, differential, transfer case, etc. are omitted, which can effectively simplify the chassis structure of equipment such as electric vehicles, ensure its compactness, and achieve the miniaturization and lightweight of the motor drive structure in equipment such as high-power and heavy-load electric vehicles; and improve the installation flexibility of the electric drive wheel. The electric vehicle in the present application can achieve true real-time all-wheel drive, have differential steering functions, etc., and is easy to operate, stable and reliable.

[0090] Example 3

[0091] In this embodiment, two motor drive structures in Embodiment 1 are connected and installed in the electric vehicle in Embodiment 2, as a pair of rear wheels of the electric vehicle, which act as driving wheels. A pair of front wheels of the electric vehicle can use a pair of free wheels without driving force, which are connected to a steering gear or a steering wheel to control the direction.

[0092] Reference Fig.11 The two motor drive structures are arranged opposite to each other, and a mounting seat 25 is arranged between the two motor drive structures. A pair of bevel gears are arranged in the mounting seat 25, namely a first bevel gear 26 and a second bevel gear 27. The first bevel gear 26 and the second bevel gear 27 are coaxially arranged and a connecting shaft 30 is arranged therebetween. The axial direction of the connecting shaft 30 is arranged along the length direction of the electric vehicle. Both ends of the connecting shaft 30 are rotatably connected to the mounting seat 25 respectively. The first bevel gear 26 and the second bevel gear 27 are sleeved on both ends of the connecting shaft 30 and the first bevel gear 26 and the second bevel gear 27 are both circumferentially fixedly connected to the connecting shaft 30.

[0093] Combination Figure 3 and Fig.11 As shown, in this embodiment, the end of the rotating shaft 2 of the motor drive structure close to the second end cover 11 is connected to the driving shaft 28, and the outer end of the driving shaft 28 is connected to the transmission shaft 29. The central axis directions of the driving shaft 28 and the transmission shaft 29 are arranged along the width direction of the electric vehicle. A first clutch 31 is arranged between the driving shaft 28 and the transmission shaft 29, and the torque transmission between the driving shaft 28 and the transmission shaft 29 can be controlled by the clutch action of the first clutch 31; a pair of helical gears 32 are also arranged on the mounting seat 25 along the width direction of the electric vehicle, one of the helical gears 32 is meshed with the first bevel gear 26, and the other helical gear 32 is meshed with the second bevel gear 27; the end of the transmission shaft 29 is connected to the central axis of the helical gear 32 to realize the torque transmission between the two.

[0094] In this embodiment, the two motor drive structures are electrically controlled and driven separately, and can independently provide driving force without interfering with each other. At the same time, when the wheel tire 24 on one of the motor drive structures has insufficient grip, the torque generated by it cannot realize the movement of the electric vehicle. At this time, the torque generated by it can be transmitted to the other motor drive structure to improve the output power of the single-sided wheel. Further, in order to improve the flexibility of the two motor drive structures, a universal joint 33 can be provided at the connection between the end of the transmission shaft 29 and the central axis of the bevel gear 32 to connect the two.

[0095] In this embodiment, the encoder assembly 8 in the motor drive structure is still retained, but the data line of the encoder assembly 8 is moved from the middle of the second end cover 11 to one side of the second end cover 11 to avoid interference with the drive shaft.

[0096] Example 4

[0097] In this embodiment, four motor drive structures in Embodiment 1 are connected and installed in the electric vehicle in Embodiment 2, serving as a pair of rear wheels and a pair of front wheels of the electric vehicle, acting as drive wheels, and achieving a four-wheel drive effect.

[0098] Reference Fig.12 This embodiment is substantially the same as the third embodiment, except that two motor drive structures are relatively arranged as a pair of front wheels, and another two motor drive structures are relatively arranged as a pair of rear wheels. The pair of front wheels and the pair of rear wheels are connected by a pair of universal joint shafts 37. The pair of universal joint shafts 37 are located between the two mounting seats 25. A second clutch 34 is provided between the universal joint shafts 37 and the corresponding connecting shafts 30. In this way, the four motor drive structures can be driven in a timely manner by combining the site environment through the electronic control system, so that each wheel tire 24 can be driven independently, and the torque can be selectively transmitted to any pair or any one of the drive wheels, thereby improving the operation capability in complex environments.

[0099] Furthermore, a tire ring 35 can be provided on the wheel hub 6, and the tire ring 35 is used to fit the wheel tire 24. A third clutch 36 is provided between the wheel hub 6 and the tire ring 35; in this way, when the motor drive structure needs to transmit torque to other wheels, the third clutch 36 can be controlled to separate as needed, so that it does not drive the wheel tire 24 corresponding to the motor drive structure to rotate, thereby meeting diverse needs.

[0100] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A motor drive structure, comprising a housing (1), a rotating shaft (2) rotatably inserted in the housing (1), a stator (3) arranged in the housing (1), and a rotor (4) corresponding to the stator (3) sleeved on the rotating shaft (2); characterized in that: One end of the rotating shaft (2) extends out of the casing (1) and is connected to a reducer (5); one end of the casing (1) is provided with a hollow wheel hub (6), and the reducer (5) is located inside the wheel hub (6); one end of the wheel hub (6) is rotatably connected to the end of the casing (1), and the other end of the wheel hub (6) is provided with a first end cover (9); The reducer (5) comprises a primary planetary reduction gear assembly (51) and a secondary planetary reduction gear assembly (52); the primary planetary reduction gear assembly (51) is located at one end of the wheel hub (6) close to the first end cover (9), and the secondary planetary reduction gear assembly (52) is located at one end of the wheel hub (6) close to the housing (1); the output end of the primary planetary reduction gear assembly (51) is connected to the input end of the secondary planetary reduction gear assembly (52), and the output end of the secondary planetary reduction gear assembly (52) is connected to the wheel hub (6) and can drive the wheel hub (6) to rotate; The first-stage planetary reduction gear assembly (51) comprises a first-stage planet carrier (511), a first-stage sun gear (512) fixedly mounted at the end of the rotating shaft (2), a first-stage inner gear ring (513) fixedly mounted on the inner wall of the wheel hub ring (6), and a plurality of first-stage planetary gears (514) rotatably arranged in the first-stage planet carrier (511), and all the first-stage planetary gears (514) are simultaneously meshed with the first-stage sun gear (512) and the first-stage inner gear ring (513); an end of the first-stage planet carrier (511) away from the second-stage planetary reduction gear assembly (52) is rotatably connected to the first end cover (9) via a first bearing (10); The secondary planetary reduction gear assembly (52) comprises a secondary planet carrier (521), a secondary sun gear (522) sleeved on the rotating shaft (2), a secondary inner gear ring (523) fixedly mounted on the inner wall of the wheel hub ring (6), and a plurality of secondary planetary gears (524) rotatably arranged in the secondary planet carrier (521), and all the secondary planetary gears (524) are simultaneously meshed with the secondary sun gear (522) and the secondary inner gear ring (523); There is a gap between the inner wall of the secondary sun gear (522) and the outer peripheral surface of the rotating shaft (2); one end of the primary planet carrier (511) away from the first end cover (9) is fixedly connected to the secondary sun gear (522); the inner and outer sides of one end of the secondary planet carrier (521) are rotatably connected to the wheel hub (6) and the primary planet carrier (511) respectively, and the other end of the secondary planet carrier (521) is fixedly connected to the casing (1); The first end cover (9) has an annular mounting groove (91) on its inner side, the first bearing (10) is embedded in the mounting groove (91) and the outer ring of the first bearing (10) is tightly matched with the groove wall of the mounting groove (91), and the inner ring of the first bearing (10) is sleeved on the outer circumferential surface of one end of the first-stage planet carrier (511); The other end of the primary planet carrier (511) is sleeved on one end of the secondary sun gear (522), and the end of the secondary planet carrier (521) is sleeved on the end of the primary planet carrier (511), and the two are rotatably connected via a fourth bearing (21); Fifth bearings (22) are provided on both sides of the secondary inner gear ring (523) in the casing (1), and both sides of the outer periphery of the secondary planet carrier (521) are rotatably connected to the casing (1) via a corresponding fifth bearing (22).

2. The motor drive structure according to claim 1, characterized in that: A brake assembly (7) is provided at the other end of the rotating shaft (2); a second end cover (11) is fixedly provided at one end of the housing (1) away from the wheel hub (6); a partition (12) is also fixedly provided at a position between the stator (3) and the second end cover (11) in the housing (1); the end of the rotating shaft (2) passes through the partition (12) and extends into the cavity between the second end cover (11) and the partition (12); the brake assembly (7) is located in the cavity between the second end cover (11) and the partition (12) and the brake assembly (7) is sleeved on the end of the rotating shaft (2).

3. The motor drive structure according to claim 2, characterized in that: The brake assembly (7) comprises an electromagnetic brake (71), and the electromagnetic brake (71) comprises a yoke assembly (711), a spline wheel (712) fixedly arranged at the end of the rotating shaft (2), and a friction plate (713) matched with the spline wheel (712) and circumferentially fixedly connected; The middle part of the second end cover (11) has a first mounting hole, one end of the electromagnetic brake (71) is mounted in the first mounting hole and the other end of the electromagnetic brake (71) faces the cavity between the second end cover (11) and the partition (12); the middle part of the electromagnetic brake (71) has a second mounting hole; the electromagnetic brake (71) is also connected to an encoder assembly (8), one end of the encoder assembly (8) is arranged in the second mounting hole, and the other end of the encoder assembly (8) is sleeved on the end of the rotating shaft (2).

4. The motor drive structure according to claim 2, characterized in that: A first step (1a) is provided on the inner wall of the casing (1), and one side of the outer peripheral edge of the partition (12) abuts against the step surface of the first step (1a); the outer peripheral edge of the partition (12) is fixedly connected to the step surface of the first step (1a) by a first fastening bolt (13); The side surface of the partition plate (12) has a first annular protrusion (12a), and the side surface of the first annular protrusion (12a) is in contact with the inner wall of the housing (1) at the first step (1a); The middle part of the partition (12) has a cylindrical portion (12b) on one side facing the stator (3) and the rotor (4), the rotating shaft (2) passes through the cylindrical portion (12b), and the rotating shaft (2) and the cylindrical portion (12b) are rotatably connected via a second bearing (14); A plurality of reinforcing rib plates (12c) are also provided between the outer peripheral surface of the cylinder portion (12b) and the side surface of the partition plate (12).

5. The motor drive structure according to claim 4, characterized in that: The end of the housing (1) has a second step (1b), and the second end cover (11) has a second annular protrusion (11a) on the side facing the stator (3) and the rotor (4), the second annular protrusion (11a) abuts against the second step (1b), and a sealing ring (15) is provided between the second annular protrusion (11a) and the second step (1b); The second end cover (11) is fixedly connected to the partition plate (12) via a second fastening bolt (16).

6. The motor drive structure according to claim 1 or 2, characterized in that: The outer circumferential surface of the casing (1) is provided with a first annular flange (1c) for being fixedly connected to the vehicle frame, the first annular flange (1c) being provided with a plurality of first connection holes (1c1), and the outer circumferential surface of the casing (1) is also provided with a plurality of heat dissipation ribs (1d), the length direction of the heat dissipation ribs (1d) being arranged along the axial direction of the casing (1), and the plurality of heat dissipation ribs (1d) being distributed at intervals along the circumference of the casing (1); one end of the heat dissipation rib (1d) is fixedly connected to the side surface of the first annular flange (1c).

7. The motor drive structure according to claim 1 or 2, characterized in that: The housing (1) has a third end cover (17) at one end close to the wheel hub (6); the rotating shaft (2) passes through the third end cover (17); and the rotating shaft (2) and the third end cover (17) are rotatably connected via a third bearing (18); a first dynamic sealing ring (19) is also provided between the rotating shaft (2) and the hole wall of the third end cover (17); the first dynamic sealing ring (19) is located on a side of the third bearing (18) facing the reducer (5); The outer peripheral surface of the wheel hub (6) is provided with a second annular flange (61) for being fixedly connected to the wheel rim, and the second annular flange (61) is provided with a plurality of second connection holes (61a); The second annular flange (61) will abut against the end surface of the casing (1), the outer side of the third end cover (17) has an annular mounting groove (17a), the end of the wheel hub (6) is inserted into the annular mounting groove (17a), and a second dynamic sealing ring (20) is provided between the inner wall of the end of the wheel hub (6) and the groove wall of the annular mounting groove (17a).

8. An electric vehicle having a motor drive structure as claimed in any one of claims 1 to 7, characterized in that: The vehicle comprises a vehicle frame (23), a wheel tire (24) and a motor drive structure, wherein a housing (1) in the motor drive structure is fixedly connected to the vehicle frame (23), and the wheel tire (24) is sleeved on a wheel hub (6) in the motor drive structure.

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