Wheel core staggered tightening and overlying combined type speed reduction driving electric driving system of two electric wheels

Abstract

The utility model discloses an electric two-wheel wheel core staggered tightening overlying combined type speed reduction driving electric driving system which comprises a power assembly and a hub, the power assembly comprises a box body assembly, a motor assembly and a speed reduction transmission assembly, and the motor assembly and the speed reduction transmission assembly are both installed in the box body assembly. The box body assembly comprises a partition plate assembly, a motor shell assembly and a speed reducer box body assembly, wherein the motor shell assembly and the speed reducer box body assembly are installed on the two sides of the partition plate assembly through threaded fasteners respectively. By the adoption of the electric two-wheel wheel core staggered tightening and overlying combined type speed reduction driving electric driving system, the box body assembly is of a split type assembly structure, when parts are maintained and replaced, the whole box body assembly does not need to be disassembled, only local disassembly can be carried out, assembling and maintaining convenience is improved, maintaining cost is reduced, maintaining time is shortened, and the service life of the electric two-wheel wheel core is prolonged. All parts of the box body assembly can be reliably locked through the threaded fasteners, so that the structural strength and reliability of the box body assembly are ensured, and the convenience of disassembly and assembly is also ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electric drive systems, in particular to an electric two-wheel wheel core staggered, compacted, stacked, combined deceleration drive electric drive system. Background Art

[0002] Electric two-wheeled vehicles refer to mechatronic personal transportation vehicles that use batteries as auxiliary energy and are equipped with motors, controllers, display instrument systems and other components on the basis of two-wheeled vehicles. They are not only travel tools, but also advanced new tools for leisure and entertainment, green travel, and can also meet the needs of fitness, personality display, social interaction, etc., with obvious advantages in economy and convenience.

[0003] The hub motor is a new power transmission technology that embeds the motor inside the wheel hub. Through the steel sheets and coils on the motor, a magnetic field is formed under the action of electric current, thereby driving the rotation of the rear wheel and realizing multiple functions such as electric vehicles. It has become an important technology for electric vehicles and motorcycles.

[0004] The advantages of wheel hub motors are: low cost, easy maintenance and wide application. Wheel hub motor technology, also known as in-wheel motor technology, is an advanced drive method used in electric vehicles and is also often used in integrated electric wheel systems developed by auto parts manufacturers. Wheel hub motor technology has great development prospects.

[0005] However, there are still some problems with hub motors:

[0006] 1. When driving on flat roads and in working conditions, the hub motor mainly uses the rated power; when driving on starting, accelerating, on slopes, overloading, driving against the wind and other driving conditions and working conditions, the hub motor uses the peak power.

[0007] 2. Hub motors generally do not have a transmission system and are low-speed motors. Therefore, their functional density is low. During long-term high-speed riding, the hub motor will not be able to speed up, and the acceleration is poor. The current is large and the energy consumption is high during starting and slope driving. Therefore, the overall driving efficiency of the hub motor is low and the cruising range is short.

[0008] 3. For the power output curve of the hub motor, the motor's efficient platform load and speed deviate from the wheel load and speed, and there are not many efficient driving roads and working conditions. Specifically, the energy conversion efficiency at the start moment is about 5%-10%, and the energy conversion efficiency from starting acceleration to the rated power maximum driving speed gradually increases from 10% to 60%-65%; when driving on a slope of less than 20°, the energy conversion efficiency is about 40%; when driving under overload or slope greater than 20°, the energy conversion efficiency is 20%-35%; when driving on ideal roads and in a good windless environment, the energy conversion efficiency is 60%-65%.

[0009] 4. The wheel hub motor structure is a closed structure that places the motor inside the wheel hub. Through the steel sheet and coil on the motor, a magnetic field is formed under the action of current, thereby driving the rotation of the rear wheel. The motor rotor is connected to the tire, and the heat dissipation performance is extremely poor. Long-term operation will increase the temperature of the motor, resulting in increased energy consumption and reduced efficiency. It may even cause tire blowouts, motor demagnetization and rust, shortening the service life of the electric two-wheeled vehicle and affecting its efficiency.

[0010] 5. The hub motor is installed inside the wheel hub. Due to the space constraints of the inner diameter of the wheel hub, the power is also restricted.

[0011] 6. When the hub motor is started, driving on a slope causes the motor to block, or the battery has a large current, the battery charge and discharge characteristics will not match the power. This will not only affect the reasonable discharge and balanced power supply of the battery, affecting the battery life, but also cause the cable to burn due to overload and overheating, and the controller to be damaged due to frequent high current shocks.

[0012] 7. The comprehensive road use and additional costs of hub motors are high, and the reliability is low.

[0013] 8. More than 95% of electric two-wheelers require the installation size to be within 200 mm. The wheel hub motor is large in size and medium in weight, which affects the handling and road feel. Specifically, when the maximum speed of an electric two-wheeler is required to be greater than 100 kilometers, due to the increase in the size and weight of the electric two-wheeler, while the cost increases, the rotational inertia of the unsprung mass around the kingpin will increase significantly, resulting in poor directional force response, a significant decrease in steering return at high speed, and a downward shift in the resonance frequency of the steering wheel shimmy, which increases the dynamic load between the tire and the ground and makes the tire ground contact worse. The increase in tire dynamic load will accelerate the fatigue damage of the wheel hub motor, and the poor ground contact is not conducive to stable handling. These changes will affect the steering road feel and increase the shimmy trend during driving.

[0014] Therefore, with the rapid development of new energy technologies, more and more motorcycles are beginning to use a combination of motors and reduction mechanisms to form an electric drive system.

[0015] Please refer to the Chinese patent with announcement number CN218868049U applied by the inventor of this application, which discloses a wheel core drive assembly, whose structure includes a rotatably mounted wheel hub and a drive system housing arranged in the internal cavity of the wheel hub, the motor and the reduction mechanism are integrated and assembled inside the drive system housing, and the two ends of the drive system housing are connected to the motorcycle frame through outwardly extending support shafts. Although such an assembly structure has certain advantages in terms of compactness, for the wheel core drive assembly, the drive system housing is an integral structure, that is, the motor, reduction mechanism, bearings and other components are all installed in a housing. When repairing and replacing components, the entire drive assembly needs to be disassembled, which has technical problems of poor assembly convenience and high maintenance cost. Utility Model Content

[0016] In order to solve the technical problems that the drive system housing of the existing wheel core drive assembly is an integral structure, which has poor assembly convenience and high maintenance cost, the utility model provides an electric two-wheel wheel core staggered, compacted, stacked, combined deceleration drive electric drive system.

[0017] The technical solution is as follows:

[0018] The first aspect of the present application relates to an electric two-wheeled wheel core staggered, compacted and stacked combined reduction drive electric drive system, including a powertrain and a wheel hub, the powertrain including a housing assembly and a motor assembly and a reduction transmission assembly both installed in the housing assembly, the housing assembly including a partition plate assembly and a motor housing assembly and a reducer housing assembly respectively installed on both sides of the partition plate assembly by threaded fasteners, the motor housing assembly and the partition plate assembly together form a motor assembly chamber, the motor assembly is installed in the motor assembly chamber, the motor housing assembly has a left support shaft extending in a direction away from the reducer housing assembly, the reducer housing assembly and the partition plate assembly together form a reduction assembly chamber, the reduction transmission assembly is installed in the reduction assembly chamber, the reducer housing assembly has a right support shaft extending in a direction away from the reducer housing assembly, the wheel hub is rotatably mounted on the right support shaft, and the motor assembly drives the wheel hub to rotate through the reduction transmission assembly.

[0019] The above electric two-wheeled wheel core staggered, compacted and stacked combined reduction drive electric drive system is adopted, and the box assembly is a split assembly structure. Not only does it not need to disassemble the entire box assembly when repairing and replacing parts, but only partial disassembly is required, which improves the convenience of assembly and maintenance and reduces maintenance costs and time. Moreover, each part of the box assembly can be reliably locked by threaded fasteners, which not only ensures the structural strength and reliability of the box assembly, but also ensures the convenience of disassembly and assembly.

[0020] In some embodiments, the partition plate assembly includes a right end cover of the motor housing and a reduction gear box rear cover that is snugly disposed on a side of the right end cover of the motor housing close to the reduction gear box assembly;

[0021] The motor housing assembly comprises a motor housing body and a left end cover of the motor housing, the right end cover of the motor housing covers one end of the motor housing body close to the reducer housing assembly, the left end cover of the motor housing covers one end of the motor housing body away from the right end cover of the motor housing, the left end cover of the motor housing, the motor housing body and the right end cover of the motor housing together form the motor assembly chamber, the left support shaft is mounted on the left end cover of the motor housing and extends in a direction away from the right end cover of the motor housing;

[0022] The reducer case assembly includes a reducer case body, which is installed on the side of the reducer case rear cover away from the right end cover of the motor housing. The reducer case body and the reducer case rear cover together form the reduction assembly chamber. The right support shaft is installed on the reducer case rear cover and passes through the reducer case body outward in the direction away from the right end cover of the motor housing, and is then equipped with a wheel hub that can rotate relative to the reducer case.

[0023] The above structure further improves the convenience of maintenance of the internal components of the box assembly and the reliability of installation. In addition, the left support shaft and the right support shaft are respectively installed on the left end cover of the motor housing and the rear cover of the reduction box. After being fixedly connected with the flat fork, the force of the wheel hub acts on the left end cover of the motor housing and the rear cover of the reduction box respectively. The two jointly bear the traction and reaction force, which can avoid stress concentration, reduce resonance and resonance, ensure the reliability of the reduction transmission components, reduce noise, and thus improve the stability, safety and reliability of the electric two-wheeled vehicle.

[0024] In some embodiments, a plurality of threaded through holes are provided along the circumference of the motor housing body and pass through both ends thereof, a first through hole is provided on the left end cover of the motor housing and is respectively connected to the corresponding threaded through holes, and each first bolt is respectively passed through the corresponding first through hole and is tightened in the corresponding threaded through hole, a second through hole is provided on the right end cover of the motor housing and is respectively connected to the corresponding threaded through hole, and a third through hole is provided on the rear cover of the reduction gearbox and is respectively connected to the corresponding second through hole, and each second bolt is respectively passed through the corresponding third through hole and the second through hole in sequence and is tightened in the corresponding threaded through hole.

[0025] In this way, the reliable connection of the various components of the motor part of the box assembly and the reliable connection with the reducer part are cleverly achieved, and the overall structure is extremely compact.

[0026] In some embodiments, the reducer body is provided with fourth through holes whose number is less than or equal to the third through holes, and each fourth through hole is respectively connected to the corresponding third through hole, and the head of the second bolt of each fourth through hole is supported on the reducer body, and the screw rod passes through the corresponding fourth through hole, the third through hole and the second through hole in sequence and is tightened in the corresponding threaded through hole.

[0027] Such a connection can significantly improve the structural integrity of the box assembly, making it more compact, while ensuring that the box assembly will not suffer from a reduction in strength due to the use of a split design.

[0028] In some embodiments, the inner end of the right support shaft is fixedly connected to a force-bearing support plate, which has a plurality of support plate mounting holes. The rear cover of the reducer is provided with connecting seats corresponding to the support plate mounting holes respectively. Each connecting seat is provided with a threaded blind hole connected to the corresponding support plate mounting hole respectively. Each third bolt passes through the corresponding support plate mounting hole and is tightened in the corresponding threaded blind hole.

[0029] Such a structure is equivalent to a fixed connection between the inner end of the right support shaft and the housing of the reducer part. The resonance and resonance generated by the transmission operation of the reduction transmission component will hardly be transmitted to the right support shaft, which can improve the stability and reliability of the assembly of the wheel core drive assembly on the frame.

[0030] In some embodiments, the motor shaft of the motor assembly is coaxially arranged with the left support shaft and the right support shaft, the reduction transmission assembly includes an intermediate shaft parallel to the motor shaft, a primary driving gear synchronously rotatably mounted on the motor shaft, a wheel hub drive sleeve rotatably mounted on the right support shaft, a secondary driven gear synchronously rotatably mounted on the wheel hub drive sleeve, and a primary driven gear synchronously rotatably mounted on the intermediate shaft, the two ends of the intermediate shaft are rotatably mounted on the reduction box body and the reduction box rear cover through two bearings, the primary driving gear is meshed with the primary driven gear, the intermediate shaft is formed with secondary driving teeth meshed with the secondary driven gear, and the wheel hub drive sleeve rotates synchronously with the wheel hub.

[0031] The above structure ensures the reliable installation of the intermediate shaft, further reduces the resonance and resonance generated by the transmission operation of the reduction transmission component, and reduces noise.

[0032] In some embodiments, the wheel hub drive sleeve includes a mounting sleeve mounted on the right support shaft and a mounting flange integrally formed at one end of the mounting sleeve close to the wheel hub. The center position of the secondary driven gear has a supporting sleeve splined with the mounting sleeve, and the mounting flange is locked to the wheel hub by a plurality of fourth bolts.

[0033] The above structure is simple and reliable, which not only ensures the reliability of cooperation with the secondary driven gear, but also ensures the reliability of cooperation with the wheel hub.

[0034] In some embodiments, the wheel hub comprises an axle hub, a rim coaxially arranged outside the axle hub, and a plurality of spokes circumferentially distributed between the axle hub and the rim, the axle hub, the rim and the spokes are all made of steel, the axle hub is locked with the mounting flange by a plurality of fourth bolts, the rim comprises an outer rim ring of an annular structure and an inner rim ring fixedly mounted inside the outer rim ring, at least one reinforced buffer chamber of an annular structure is enclosed between the outer rim ring and the inner rim ring, and the spokes are spokes or spoke plates;

[0035] When the wheel spokes are spokes, the spokes are all bent tube structures, and the two ends of each spoke are respectively fixedly connected to the wheel axle hub and the inner ring of the rim, so that the inner ring of the rim, the wheel axle hub and each spoke are surrounded to form a powertrain installation space with a groove-shaped structure, and the powertrain is located in the powertrain installation space;

[0036] When the spokes are spoke plates, the spoke plates are plate-like structures that are bent outward, and the two ends of each spoke plate are respectively fixedly connected to the wheel axle hub and the inner ring of the rim, so that the inner ring of the rim, the wheel axle hub and each spoke are combined to form a powertrain installation space with a groove-like structure, and the powertrain is located in the powertrain installation space.

[0037] The above structure not only greatly improves the strength of the rim part through the double-layer rim structure, ensures the reliable installation of the tire, and improves the durability of the tire, but also the spokes are made of steel pipes or steel plates. Under the premise of ensuring the structural strength, the weight is greatly reduced, meeting the lightweight design requirements and having better anti-collision performance; the rim is a hollow structure, the spokes are also a hollow structure, and the spoke plate is made of steel plates, which can effectively improve the heat dissipation capacity of the wheel hub to a certain extent, protect the tire, and improve the durability of the tire. In addition, the cup-shaped powertrain installation space is easy to embed the powertrain inside the wheel hub, which not only makes the overall structure more compact, fully utilizes the position space, reduces the volume, reduces the weight, and achieves lightweight, but also has better balance, improves efficiency, and extends the vehicle's endurance.

[0038] In some embodiments, the inner ring of the wheel rim is a "U"-shaped groove structure, and the groove walls on both sides of the inner ring of the wheel rim are inclined outward from the groove bottom to the groove opening.

[0039] This design not only ensures the beautiful appearance of the rim, but also facilitates the connection with the spokes.

[0040] In some embodiments, the rim outer ring includes a bead seat with an annular groove structure and a deepened groove bottom recessed at the bottom of the bead seat groove, and the transition positions between the groove walls on both sides of the bead seat and the groove bottom are fixedly connected to the groove opening positions of the groove walls on both sides of the rim inner ring.

[0041] The above structure enables the outer ring of the rim and the inner ring of the rim to be integrated in appearance, thereby improving the overall aesthetic appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a schematic structural diagram of the electric drive system when the wheel hub is embodiment 1;

[0043] Figure 2 It is a structural schematic diagram of the motor component and part of the box assembly;

[0044] Figure 3 It is a structural schematic diagram of the reduction transmission component and part of the box assembly;

[0045] Figure 4 It is a structural schematic diagram of the box assembly;

[0046] Figure 5 is a cross-sectional view of wheel hub embodiment 1;

[0047] Figure 6 for Figure 5 Right view of;

[0048] Figure 7 is a cross-sectional view of a wheel hub embodiment 2;

[0049] Figure 8 for Figure 7 Left view of

[0050] Fig. 9 for Figure 7 Right view of;

[0051] Fig.10 is a schematic structural diagram of the electric drive system when the wheel hub is embodiment 2;

[0052] Fig.11 It is a cross-sectional view of wheel hub embodiment 3. DETAILED DESCRIPTION

[0053] The utility model is further described below in conjunction with embodiments and drawings.

[0054] like Figure 1-Figure 11 As shown, an electric two-wheeled wheel core staggered, compacted and stacked combined reduction drive electric drive system mainly includes a power assembly and a wheel hub 2.

[0055] See also Figure 1-Figure 4 as well as Fig.10 The power assembly includes a housing assembly 1, a motor assembly 3 and a reduction transmission assembly 4. The motor assembly 3 and the reduction transmission assembly 4 are both installed in the housing assembly 1. The motor assembly 3 drives the wheel hub 2 to rotate through the reduction transmission assembly 4 to realize the driving of the vehicle.

[0056] The housing assembly 1 includes a partition plate assembly 1a and a motor housing assembly 1b and a reducer housing assembly 1c respectively installed on both sides of the partition plate assembly 1a by threaded fasteners. Specifically, the motor housing assembly 1b, the partition plate assembly 1a and the reducer housing assembly 1c are connected in sequence from left to right to realize the split assembly structure of the housing assembly 1.

[0057] In this embodiment, the motor housing assembly 1b and the partition plate assembly 1a together form a motor assembly chamber, and the motor assembly 3 is installed in the motor assembly chamber, ensuring the reliable installation of the motor assembly 3 and a stable working environment. The motor housing assembly 1b has a left support shaft 1b1 extending away from the reducer case assembly 1c.

[0058] Similarly, the reducer case assembly 1c and the partition plate assembly 1a together form a reducer assembly chamber, and the reduction transmission assembly 4 is installed in the reducer assembly chamber, ensuring the reliable installation of the reduction transmission assembly 4 and a stable working environment. The reducer case assembly 1c has a right support shaft 1c1 extending away from the reducer case assembly 1c, and the wheel hub 2 can be rotatably mounted on the right support shaft 1c1.

[0059] Therefore, the split assembly structure of the above-mentioned box assembly 1 not only does not require the entire box assembly 1 to be disassembled when repairing and replacing parts, but only requires partial disassembly, thereby improving the convenience of assembly and maintenance and reducing maintenance costs and time, and the various parts of the box assembly can be reliably locked by threaded fasteners, which not only ensures the structural strength and reliability of the box assembly, but also ensures the convenience of assembly and disassembly.

[0060] Furthermore, the partition plate assembly 1a includes a right end cover 1a1 of the motor housing and a reducer case rear cover 1a2 which is snugly arranged on the right end cover 1a1 of the motor housing close to the reducer case assembly 1c. The partition plate assembly 1a is divided into two parts, which are respectively assembled with the motor housing assembly 1b and the reducer case assembly 1c into a complete case, thereby ensuring the reliability of the assembly of the motor assembly 3 and the reduction transmission assembly 4.

[0061] See also Figure 2 and Figure 4The motor housing assembly 1b includes a motor housing body 1b2 and a left end cover 1b3 of the motor housing. The right end cover 1a1 of the motor housing covers one end of the motor housing body 1b2 close to the reducer case assembly 1c. The left end cover 1b3 of the motor housing covers one end of the motor housing body 1b2 away from the right end cover 1a1 of the motor housing. The left end cover 1b3 of the motor housing, the motor housing body 1b2 and the right end cover 1a1 of the motor housing together form a motor assembly chamber. The left support shaft 1b1 is installed on the left end cover 1b3 of the motor housing and extends in a direction away from the right end cover 1a1 of the motor housing. The motor assembly 3 is installed in the motor assembly chamber, which is stable and reliable. Moreover, the motor shaft 3a of the motor assembly 3 passes through the right end cover 1a1 of the motor housing and then passes into the reduction assembly chamber.

[0062] Furthermore, the rear end of the left support shaft 1b1 is fixedly connected with a left shaft support plate 1b11, which is locked on the left end cover 1b3 of the motor housing by a fifth bolt 1b12, ensuring the reliable installation of the left support shaft 1b1. Such a structure is equivalent to the inner end of the left support shaft 1b1 being fixedly connected to the housing of the motor part, and the resonance and resonance generated by the transmission operation of the motor assembly 3 will hardly be transmitted to the left support shaft 1b1, which can improve the stability and reliability of the assembly of the wheel core drive assembly on the vehicle frame.

[0063] See also Figure 3 and Figure 4 The reducer case assembly 1c includes a reducer body 1c2, which is installed on the side of the reducer rear cover 1a2 away from the right end cover 1a1 of the motor housing. The reducer body 1c2 and the reducer rear cover 1a2 together form a reduction assembly chamber. The right support shaft 1c1 is installed on the reducer rear cover 1a2, and passes through the reducer body 1c2 outward in the direction away from the right end cover 1a1 of the motor housing, and is then fitted with a wheel hub 2 that can rotate relative to the reducer body. The reduction transmission assembly 4 is installed in the reduction assembly chamber, which is stable and reliable.

[0064] The inner end of the right support shaft 1c1 is fixedly connected with a force-bearing support plate 1f, which is provided with a plurality of support plate mounting holes. The reduction box rear cover 1a2 is provided with connection seats 1a22 corresponding to the support plate mounting holes, and each connection seat 1a22 is provided with a threaded blind hole 1a23 connected to the corresponding support plate mounting hole. Each third bolt passes through the corresponding support plate mounting hole and is tightened in the corresponding threaded blind hole 1a23, ensuring the reliable installation of the right support shaft 1c1. Such a structure is equivalent to the inner end of the right support shaft 1c1 being fixedly connected to the housing of the reducer part, and the resonance and resonance generated by the transmission operation of the reduction transmission assembly 4 will hardly be transmitted to the right support shaft 1c1, which can improve the stability and reliability of the assembly of the wheel core drive assembly on the frame.

[0065] See also Figure 4, a plurality of threaded through holes 1b21 are provided along the circumference of the motor housing body 1b2, and the first through holes 1b31 are provided on the left end cover 1b3 of the motor housing, which are respectively connected to the corresponding threaded through holes 1b21, and each first bolt 1d is respectively passed through the corresponding first through holes 1b31 and then screwed into the corresponding threaded through holes 1b21, and the second through holes 1a11 are respectively connected to the corresponding threaded through holes 1b21 on the right end cover 1a1 of the motor housing, and the third through holes 1a21 are respectively connected to the corresponding second through holes 1a11 on the rear cover 1a2 of the reduction box, and each second bolt 1e is respectively passed through the corresponding third through holes 1a21 and the second through holes 1a11 and then screwed into the corresponding threaded through holes 1b21. That is, after the first bolt 1d and the second bolt 1e are screwed, the left end cover 1b3 of the motor housing and the partition plate assembly 1a are tightened on the motor housing body 1b2, thereby ensuring the overall structural strength. In this way, the reliable connection of the various components of the motor part of the box assembly 1 and the reliable connection with the reducer part are cleverly achieved, and the overall structure is extremely compact.

[0066] Furthermore, the reduction box body 1c2 is provided with fourth through holes 1c21 whose number is less than or equal to the third through holes 1a21, and each fourth through hole 1c21 is connected to the corresponding third through hole 1a21, and the heads of the second bolts 1e connected to each fourth through hole 1c21 are supported on the reduction box body 1c2, and the screw rods pass through the corresponding fourth through holes 1c21, the third through holes 1a21 and the second through holes 1a11 in sequence and are then tightened in the corresponding threaded through holes 1b21. Therefore, after the second bolts 1e are tightened, the reduction box body 1c2 and the partition plate assembly 1a can be tightened on the motor housing body 1b2 at the same time, which not only ensures the reliable connection of the reducer part of the housing assembly 1, but also improves the assembly accuracy while reducing the assembly process. In addition, the structural integrity of the housing assembly 1 can be significantly improved, making it more compact, and at the same time, it is ensured that the housing assembly will not have the problem of strength reduction due to the use of a split design.

[0067] See also Figure 1 and Figure 2 The motor assembly 3 includes a motor shaft 3a, a rotor 3b synchronously rotatedly mounted on the motor shaft 3a, and a stator 3c fixedly mounted on the inner circumference of the motor housing body 1b2, and the stator 3c surrounds the rotor 3b. The motor shaft 3a of the motor assembly 3 is coaxially arranged with the left support shaft 1b1 and the right support shaft 1c1, and the two ends of the motor shaft 3a are rotatably supported on the left end cover 1b3 of the motor housing and the right end cover 1a1 of the motor housing through two bearings, which is simple and reliable.

[0068] See also Figure 1 and Figure 3The reduction transmission assembly 4 includes an intermediate shaft 4a parallel to the motor shaft 3a, a primary driving gear 4b synchronously rotatably mounted on the motor shaft 3a, a wheel hub driving sleeve 4c rotatably mounted on the right support shaft 1c1, a secondary driven gear 4d synchronously rotatably mounted on the wheel hub driving sleeve 4c, and a primary driven gear 4e synchronously rotatably mounted on the intermediate shaft 4a. Both ends of the intermediate shaft 4a are rotatably mounted on the reduction box body 1c2 and the reduction box rear cover 1a2 through two bearings. The primary driving gear 4b meshes with the primary driven gear 4e. The intermediate shaft 4a is formed with a secondary driving tooth 4a1 meshing with the secondary driven gear 4d. The wheel hub driving sleeve 4c rotates synchronously with the wheel hub 2. The above structure ensures the reliable installation of the intermediate shaft 4a, further reduces the resonance and resonance generated by the transmission operation of the reduction transmission assembly, and reduces noise.

[0069] Based on this, the transmission path of the wheel core drive assembly is: motor shaft 3a→primary driving gear 4b→primary driven gear 4e→intermediate shaft 4a→secondary driving gear 4a1→secondary driven gear 4d→wheel hub drive sleeve 4c→wheel hub 2.

[0070] The wheel hub driving sleeve 4c includes a mounting sleeve 4c1 sleeved on the right supporting shaft 1c1 and a mounting flange 4c2 integrally formed on one end of the mounting sleeve 4c1 close to the wheel hub 2. The center of the secondary driven gear 4d has a supporting sleeve 4d1 splined with the mounting sleeve 4c1, and the mounting flange 4c2 is locked with the wheel hub 2 by a plurality of fourth bolts 4f. The above structure is simple and reliable, which not only ensures the reliability of the cooperation with the secondary driven gear 4d, but also ensures the reliability of the cooperation with the wheel hub 2.

[0071] Wheel hub 2 embodiment 1:

[0072] See also Figure 1 , Figure 5 and Figure 6 The wheel hub 2 mainly includes a wheel hub 2a, a wheel rim 2b and a plurality of wheel spokes 2c. The wheel hub 2a, the wheel rim 2b and the wheel spokes 2c are all made of steel, which has the advantages of low cost, strong durability, and not easy to deform and wear. It should be pointed out that each wheel spoke 2c of the present embodiment is a spoke plate, and the wheel rim 2b is coaxially arranged on the outer side of the wheel hub 2a. The wheel hub 2a is locked with the mounting flange 4c2 by a plurality of fourth bolts 4f, and each spoke plate is distributed between the wheel hub 2a and the wheel rim 2b along the circumferential direction, that is, the two ends of the spoke plate are fixedly connected with the wheel hub 2a and the wheel rim 2b respectively. In addition, the wheel hub 2a protrudes from one side of the wheel rim inner ring 2b2, and the spoke plates are all plate-like structures bent outward, so that the wheel rim inner ring 2b2, the wheel hub 2a and each spoke plate enclose a powertrain installation space 5 with a groove-like structure, so that the overall wheel hub structure is similar to a conventional wheel hub structure.

[0073] The number of spokes can be any number, depending on the maximum load that the hub needs to bear. In this embodiment, each spoke is first fixedly connected to the axle hub 2a and the rim 2b by welding, and then the hub is integrally stamped to form the powertrain installation space 5, and finally finalized. The spoke 2c is made of spokes and integrally stamped, which has low process difficulty, less equipment investment, is easy to mass produce, and is lighter in weight and lower in cost.

[0074] In this embodiment, the rim 2b adopts a double-layer structure, and the rim 2b includes a rim outer ring 2b1 and a rim inner ring 2b2, both of which are annular structures, wherein the rim inner ring 2b2 is fixedly installed on the inner side of the rim outer ring 2b1. The rim inner ring 2b2 in this embodiment is preferably fixedly installed on the inner side of the rim outer ring 2b1 by welding, which has a simple process, is stable and reliable, and is durable.

[0075] Furthermore, at least one reinforced buffer chamber 2b3 in an annular structure is formed between the rim outer ring 2b1 and the rim inner ring 2b2, thereby greatly improving the strength of the rim 2b, ensuring reliable installation of the tire, and improving the durability of the tire.

[0076] In this embodiment, the two ends of each spoke are fixedly connected to the wheel axle hub 2a and the wheel rim inner ring 2b2 by welding process, which is simple in process, stable, reliable and durable.

[0077] See also Figure 5 The inner ring 2b2 of the rim is a "U"-shaped groove structure, and the groove walls on both sides of the inner ring 2b2 of the rim are inclined outward from the bottom of the groove to the groove mouth, which ensures the aesthetic appearance of the rim 2b and is easy to connect with the spokes.

[0078] The wheel rim outer ring 2b1 of this embodiment is a traditional structure. Specifically, the wheel rim outer ring 2b1 includes a bead seat 2b11 in an annular groove structure and a deepened groove bottom 2b12 formed at the groove bottom position of the bead seat 2b11. The tire is mounted on the bead seat 2b11. The transition positions between the groove walls on both sides of the bead seat 2b11 and the groove bottom are fixedly connected to the groove opening positions of the groove walls on both sides of the wheel rim inner ring 2b2, so that the wheel rim outer ring 2b1 and the wheel rim inner ring 2b2 are integrated in appearance, improving the overall appearance aesthetics.

[0079] See also Figure 5In this embodiment, the groove bottom of the deepened groove bottom 2b12 fits with the groove bottom of the rim inner ring 2b2, so that the rim outer ring 2b1 and the rim inner ring 2b2 enclose two reinforced buffer chambers 2b3 relatively arranged on both sides of the deepened groove bottom 2b12. The design of partial fit between the rim outer ring 2b1 and the rim inner ring 2b2 makes the connection between the rim outer ring 2b1 and the rim inner ring 2b2 more reliable. At the same time, the outer edge of the spoke is fixedly connected to the groove wall position of the rim inner ring 2b2, that is, the connection position between the spoke and the rim inner ring 2b2 corresponds to the reinforced buffer chamber 2b3, which not only improves the overall structural strength of the steel hub, but also facilitates heat dissipation.

[0080] See also Figure 1 and Figure 6 In this embodiment, the wheel rim inner ring 2b2, the wheel axle hub 2a and the spokes together form a powertrain installation space 5 with a groove-shaped structure, and the powertrain installation space 5 is used to accommodate the powertrain 5.

[0081] It should be pointed out that each spoke can be pre-formed first and then fixedly connected to the axle hub 2a and the rim 2b by a welding process, or each spoke can be first fixedly connected to the axle hub 2a and the rim 2b by a welding process, and then the hub is stamped as a whole to form the powertrain installation space 5 and finally finalized.

[0082] Wheel hub 2 embodiment 2:

[0083] See also Figure 7-Figure 10 The main structure of this embodiment is exactly the same as that of the wheel hub 2 in embodiment 1, with the difference that each spoke 2c of this embodiment is a spoke, and the number of spokes can be any, depending on the maximum load that the wheel hub needs to withstand.

[0084] The spokes are all tubular structures, and can be egg-shaped tubes, diamond-shaped tubes, flat oval tubes and other common tubular structures, which can ensure both aesthetics and structural strength. The two ends of each spoke are fixedly connected to the wheel hub 2a and the inner ring of the rim 2b2 by welding technology, which is simple in process, stable and reliable, and durable.

[0085] Therefore, the spokes in this embodiment are made of steel pipes, which greatly reduces the weight while ensuring the structural strength, meeting the lightweight design requirements. At the same time, the rim 2b and the spokes are hollow structures, which can effectively improve the heat dissipation capacity of the hub to a certain extent, protect the tire, improve the durability of the tire, and have better anti-collision performance.

[0086] In this embodiment, the axle hub 2a protrudes from one side of the rim inner ring 2b2, and each spoke is a bent tube structure, so that the rim inner ring 2b2, the axle hub 2a and the spokes together form a powertrain installation space 5 with a groove-shaped structure, and the powertrain installation space 5 is used to accommodate the powertrain 5.

[0087] Specifically, a plurality of mounting holes 2a1 are formed on the axle hub 2a, and each mounting hole 2a1 on the axle hub 2a is locked with the mounting flange 4c2 by a plurality of fourth bolts 4f.

[0088] Furthermore, at least one connection hole 2c1 is also provided on the spoke, which can further improve the reliability of the connection between the power assembly 5 and the present embodiment.

[0089] Furthermore, the connection holes 2c1 are all waist-shaped holes extending along the length direction of the corresponding spokes, so as to adapt to power assemblies 5 of different sizes and have good versatility.

[0090] It should be pointed out that each spoke can be pre-formed first and then fixedly connected to the axle hub 2a and the rim 2b through a welding process, or each spoke can be first fixedly connected to the axle hub 2a and the rim 2b through a welding process, and then the hub is stamped as a whole to form a powertrain installation space 5 and finally finalized.

[0091] Wheel hub 2 embodiment 3:

[0092] See also Fig.11 The main structure of this embodiment is exactly the same as that of the wheel hub 2 in the second embodiment, except that a gap is left between the groove bottom of the deepened groove bottom 2b12 and the groove bottom of the inner ring 2b2 of the rim, so that a reinforced buffer chamber 2b3 is formed between the outer ring 2b1 of the rim and the inner ring 2b2 of the rim. The reinforced buffer chamber 2b3 of this embodiment has a large space and can achieve better heat dissipation performance.

[0093] Similar to the second embodiment of the hub 2, in this embodiment, the outer edge of the spoke is fixedly connected to the groove wall of the inner ring 2b2 of the rim, so that a larger powertrain installation space 5 can be obtained to accommodate powertrains 5 of different sizes.

[0094] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make a variety of similar expressions without violating the purpose and claims of the present invention, and such changes fall within the scope of protection of the present invention.

Claims

1. An electric two-wheeled wheel core staggered, compacted, and stacked combined deceleration drive electric drive system, comprising a power assembly and a wheel hub (2), characterized in that: The power assembly comprises a housing assembly (1), and a motor assembly (3) and a reduction transmission assembly (4) both mounted in the housing assembly (1); the housing assembly (1) comprises a partition plate assembly (1a), and a motor housing assembly (1b) and a reduction gear housing assembly (1c) respectively mounted on both sides of the partition plate assembly (1a) via threaded fasteners; the motor housing assembly (1b) and the partition plate assembly (1a) together form a motor assembly chamber; the motor assembly (3) is mounted in the motor assembly chamber; the motor housing assembly (1b) has A left support shaft (1b1) extends in a direction away from the reducer housing assembly (1c); the reducer housing assembly (1c) and the partition plate assembly (1a) together form a reduction assembly chamber; the reduction transmission assembly (4) is installed in the reduction assembly chamber; the reducer housing assembly (1c) has a right support shaft (1c1) extending in a direction away from the reducer housing assembly (1c); the wheel hub (2) is rotatably mounted on the right support shaft (1c1); and the motor assembly (3) drives the wheel hub (2) to rotate via the reduction transmission assembly (4).

2. The electric two-wheeled wheel core staggered, compacted, and stacked combined deceleration drive electric drive system according to claim 1 is characterized by: The partition plate assembly (1a) comprises a right end cover (1a1) of a motor housing and a reduction gear box rear cover (1a2) which is arranged in a close relationship on a side of the right end cover (1a1) of the motor housing close to the reduction gear box assembly (1c); The motor housing assembly (1b) comprises a motor housing body (1b2) and a motor housing left end cover (1b3); the motor housing right end cover (1a1) covers an end of the motor housing body (1b2) close to the reducer housing assembly (1c); the motor housing left end cover (1b3) covers an end of the motor housing body (1b2) away from the motor housing right end cover (1a1); the motor housing left end cover (1b3), the motor housing body (1b2) and the motor housing right end cover (1a1) together form the motor assembly chamber; the left support shaft (1b1) is mounted on the motor housing left end cover (1b3) and extends in a direction away from the motor housing right end cover (1a1); The reducer housing assembly (1c) comprises a reducer housing body (1c2), which is mounted on a side of the reducer housing rear cover (1a2) away from the right end cover (1a1) of the motor housing. The reducer housing body (1c2) and the reducer housing rear cover (1a2) together form the reduction assembly chamber. The right support shaft (1c1) is mounted on the reducer housing rear cover (1a2) and passes through the reducer housing body (1c2) in a direction away from the right end cover (1a1) of the motor housing, and is then fitted with a wheel hub (2) that can rotate relative to the reducer housing body.

3. The electric two-wheeled wheel core staggered, compacted, and stacked combined deceleration drive electric drive system according to claim 2 is characterized by: A plurality of threaded through holes (1b21) are provided along the circumference of the motor housing body (1b2) and pass through both ends thereof; a first through hole (1b31) is provided on the left end cover (1b3) of the motor housing and is respectively connected to the corresponding threaded through hole (1b21); each first bolt (1d) passes through the corresponding first through hole (1b31) and is screwed into the corresponding threaded through hole (1b21); a second through hole (1a11) is provided on the right end cover (1a1) of the motor housing and is respectively connected to the corresponding threaded through hole (1b21); a third through hole (1a21) is provided on the reduction box rear cover (1a2) and is respectively connected to the corresponding second through hole (1a11); each second bolt (1e) passes through the corresponding third through hole (1a21) and the second through hole (1a11) in sequence and is screwed into the corresponding threaded through hole (1b21).

4. The electric two-wheeled wheel core staggered, compacted, and stacked combined deceleration drive electric drive system according to claim 3 is characterized by: The reduction box body (1c2) is provided with fourth through holes (1c21) whose number is less than or equal to the third through holes (1a21); each fourth through hole (1c21) is connected to the corresponding third through hole (1a21); the head of the second bolt (1e) connected to each fourth through hole (1c21) is supported on the reduction box body (1c2); the screw rod part passes through the corresponding fourth through hole (1c21), the third through hole (1a21) and the second through hole (1a11) in sequence and is then screwed into the corresponding threaded through hole (1b21).

5. The electric two-wheeled wheel core staggered, compacted, and stacked combined deceleration drive electric drive system according to claim 2 is characterized by: The inner end of the right support shaft (1c1) is fixedly connected to a load-bearing support plate (1f), and a plurality of support plate mounting holes are provided on the load-bearing support plate (1f). The reduction box rear cover (1a2) is provided with connecting seats (1a22) corresponding to the respective support plate mounting holes, and each connecting seat (1a22) is provided with a threaded blind hole (1a23) connected to the corresponding support plate mounting hole, and each third bolt passes through the corresponding support plate mounting hole and is tightened in the corresponding threaded blind hole (1a23).

6. The electric two-wheeled wheel core staggered, compacted, and stacked combined deceleration drive electric drive system according to claim 5 is characterized by: The motor shaft (3a) of the motor assembly (3) is coaxially arranged with the left support shaft (1b1) and the right support shaft (1c1), and the reduction transmission assembly (4) comprises an intermediate shaft (4a) parallel to the motor shaft (3a), a primary driving gear (4b) synchronously rotatably mounted on the motor shaft (3a), a wheel hub driving sleeve (4c) rotatably mounted on the right support shaft (1c1), a secondary driven gear (4d) synchronously rotatably mounted on the wheel hub driving sleeve (4c), and A primary driven gear (4e) is synchronously rotatably sleeved on an intermediate shaft (4a); both ends of the intermediate shaft (4a) are rotatably mounted on a reduction box body (1c2) and a reduction box rear cover (1a2) via two bearings; the primary driving gear (4b) meshes with the primary driven gear (4e); a secondary driving tooth (4a1) meshing with the secondary driven gear (4d) is formed on the intermediate shaft (4a); and the wheel hub drive sleeve (4c) rotates synchronously with the wheel hub (2).

7. The electric two-wheeled wheel core staggered, compacted, and stacked combined deceleration drive electric drive system according to claim 6, characterized in that: The wheel hub drive sleeve (4c) comprises a mounting sleeve (4c1) sleeved on the right support shaft (1c1) and a mounting flange (4c2) integrally formed on one end of the mounting sleeve (4c1) close to the wheel hub (2); a supporting sleeve (4d1) spline-matched with the mounting sleeve (4c1) is provided at the center of the secondary driven gear (4d); and the mounting flange (4c2) is locked with the wheel hub (2) by a plurality of fourth bolts (4f).

8. The electric two-wheeled wheel core staggered, compacted, and stacked combined deceleration drive electric drive system according to claim 7, characterized in that: The wheel hub (2) comprises an axle hub (2a), a rim (2b) coaxially arranged on the outside of the axle hub (2a), and a plurality of spokes (2c) circumferentially distributed between the axle hub (2a) and the rim (2b); the axle hub (2a), the rim (2b) and the spokes (2c) are all made of steel; the axle hub (2a) is locked with a mounting flange (4c2) by a plurality of fourth bolts (4f); the rim (2b) comprises an outer rim ring (2b1) in an annular structure and an inner rim ring (2b2) ​​fixedly mounted on the inner side of the outer rim ring (2b1); at least one reinforced buffer chamber (2b3) in an annular structure is enclosed between the outer rim ring (2b1) and the inner rim ring (2b2); the spokes (2c) are spokes or spoke plates; When the wheel spokes (2c) are spokes, the spokes are all bent tube structures, and the two ends of each spoke are respectively fixedly connected to the wheel axle hub (2a) and the wheel rim inner ring (2b2), so that the wheel rim inner ring (2b2), the wheel axle hub (2a) and each wheel spoke (2c) are surrounded to form a power assembly installation space (5) with a groove-shaped structure, and the power assembly is located in the power assembly installation space (5); When the wheel spokes (2c) are spoke plates, the spoke plates are plate-like structures that are bent outwards, and the two ends of each spoke plate are respectively fixedly connected to the wheel axle hub (2a) and the wheel rim inner ring (2b2), so that the wheel rim inner ring (2b2), the wheel axle hub (2a) and each wheel spoke (2c) are combined to form a powertrain installation space (5) with a groove-like structure, and the powertrain is located in the powertrain installation space (5).

9. The electric two-wheeled wheel core staggered, compacted, and stacked combined deceleration drive electric drive system according to claim 8, characterized in that: The wheel rim inner ring (2b2) ​​is a "U"-shaped groove structure, and the groove walls on both sides of the wheel rim inner ring (2b2) ​​are inclined outward from the groove bottom to the groove opening.

10. The electric two-wheeled wheel core staggered, compacted, and stacked combined deceleration drive electric drive system according to claim 8, characterized in that: The wheel rim outer ring (2b1) comprises a bead seat (2b11) in an annular groove structure and a deepened groove bottom (2b12) recessed at the groove bottom position of the bead seat (2b11); transition positions between the groove walls on both sides of the bead seat (2b11) and the groove bottom are respectively fixedly connected to the groove opening positions of the groove walls on both sides of the wheel rim inner ring (2b2).

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