Easily-assembled stable wheel core electric driving system box body and wheel core electric driving system

Abstract

The utility model discloses a stable type wheel core electric drive system box body easy to assemble and a wheel core electric drive system, a shaft installation seat is arranged at the inner end of a second supporting shaft of the box body, a reduction gearbox assembly is provided with a shaft connecting seat matched with the shaft installation seat, the shaft installation seat is locked on the shaft connecting seat through a locking bolt, and the shaft connecting seat is connected with the shaft installation seat. A blocking table extending towards the shaft mounting base is integrally formed on the shaft connecting base, and at least part of the circumferential outer wall of the shaft mounting base is supported on the blocking table. Locking bolts for fixing the second supporting shaft are all installed outside the reduction gearbox assembly, the second supporting shaft can be very conveniently debugged, the installation precision of the second supporting shaft is improved, the second supporting shaft can be reliably supported by arranging a blocking table, and therefore the installation stability of the second supporting shaft is greatly improved, and the service life of the second supporting shaft is prolonged. And meanwhile, the stress capacity of the second supporting shaft is improved, and the risk that the second supporting shaft is loosened or fractured and falls off after being used for a long time is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric drive devices, in particular to a stable wheel core electric drive system box body and a wheel core electric drive system which are easy to assemble. 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. Among them, wheel core drive is a common drive method in motorcycle electric drive systems. By integrating high-speed motors and reducers in the wheel hub, it has obvious advantages in terms of compactness, torque transmission capability, and motor efficiency.

[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.

[0016] Therefore, referring to the Chinese utility model patent application with application number 202420807200.7 applied by the applicant of this application, 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, 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 disassembly and assembly.

[0017] However, during the testing and use process, the applicant found that since the bolts fixing the right support shaft were located inside the reduction gearbox assembly, not only was it completely impossible to debug the right support shaft without opening the reduction gearbox assembly, but the installation stability of the right support shaft was poor, and the force was completely supported by a few bolts, which made it very easy for the shaft to loosen or break and fall off during long-term use.

[0018] Solving the above problems has become a top priority. Utility Model Content

[0019] In order to solve the technical problems that the right support shaft (equivalent to the second support shaft in this application) cannot be debugged without opening the reduction gearbox assembly, and the installation stability of the right support shaft is poor, the utility model provides a stable wheel core electric drive system box and a wheel core electric drive system that are easy to assemble.

[0020] The technical solution is as follows:

[0021] The first aspect of the present application relates to a stable wheel core electric drive system case that is easy to assemble, including a motor shell assembly that encloses a motor assembly chamber and a reduction box assembly that encloses a reduction box chamber, the motor shell assembly and the reduction box assembly are locked together by threaded fasteners, a first support shaft extending away from the reduction box assembly is installed on the side of the motor shell assembly away from the reduction box assembly, the reduction box assembly is provided with a second support shaft extending away from the motor shell assembly, the inner end of the second support shaft extending into the reduction box chamber has a shaft mounting seat, and the inner wall of the reduction box assembly is integrally formed with the shaft mounting seat A matching shaft connecting seat, the end face of the shaft mounting seat is supported on the shaft connecting seat, the shaft connecting seat is integrally formed with a stop platform extending toward the shaft mounting seat, at least part of the circumferential outer wall of the shaft mounting seat is supported on the stop platform, a plurality of bolt connecting holes are provided on the shaft mounting seat, and bolt loading holes corresponding to each bolt connecting hole are provided on the shaft connecting seat, each bolt loading hole is recessed on the outer surface of the reduction box assembly to form a nut groove, each locking bolt is respectively passed through the corresponding bolt loading hole and tightened in the corresponding bolt connecting hole, and the outer end surface of the nut of each locking bolt is not higher than the notch position of the corresponding nut groove.

[0022] By adopting the above-mentioned stable wheel core electric drive system box and wheel core electric drive system that are easy to assemble, the locking bolts for fixing the second support shaft are all installed on the outside of the reduction box assembly, which makes it very convenient to debug the second support shaft and improve the installation accuracy of the second support shaft. In addition, by setting a baffle, reliable support can be provided for the second support shaft, thereby greatly improving the stability of the installation of the second support shaft, and at the same time improving the force-bearing capacity of the second support shaft, greatly reducing the risk of loosening or breaking of the second support shaft after long-term use.

[0023] In some embodiments, the motor housing assembly includes a motor housing body with a cylindrical structure, a first end cover of the motor housing covering the end of the motor housing body away from the reduction gear assembly, and a second end cover of the motor housing covering the end of the motor housing body close to the reduction gear assembly. The reduction gear assembly includes a reduction gear body and a reduction gear rear cover covering the side of the reduction gear body close to the second end cover of the motor housing, the reduction gear rear cover is fitted with the second end cover of the motor housing, the motor housing body, the first end cover of the motor housing, the second end cover of the motor housing, the reduction gear body and the reduction gear rear cover are locked together by threaded fasteners, the first support shaft is installed on the first end cover of the motor housing and extends in a direction away from the motor housing body, the shaft connecting seat is integrally formed on the inner surface of the reduction gear rear cover, the nut recesses are recessed on the outer surface of the reduction gear rear cover, and the bolt insertion holes pass through the reduction gear rear cover and the shaft connecting seat along the thickness direction.

[0024] In some embodiments, the threaded fasteners include multiple short bolts and multiple long bolts, the first end cover of the motor housing is locked on the motor housing body by multiple short bolts, and the reduction gear box body, reduction gear box rear cover and the second end cover of the motor housing are locked on the motor housing body by multiple long bolts.

[0025] In some embodiments, a plurality of baffle reinforcement ribs are provided between the baffle and the circumferential inner wall of the reduction gearbox rear cover.

[0026] The second aspect of the present application relates to a wheel core electric drive system, including a wheel hub, a motor assembly, a reduction transmission assembly and the above-mentioned stable wheel core electric drive system case that is easy to assemble, the motor assembly is installed in the motor assembly chamber, the reduction transmission assembly is installed in the reduction assembly chamber, the motor shaft of the motor assembly is coaxially arranged with the first support shaft and the second support shaft, the outer end of the motor shaft penetrates into the reduction assembly chamber and drives the wheel hub to rotate through the reduction transmission assembly, the wheel hub protrudes to one side to form a powertrain installation space that is compatible with the motor housing assembly and the reduction box assembly, and the motor housing assembly and the reduction box assembly are at least partially located in the powertrain installation space.

[0027] By adopting the above wheel core electric drive system, the motor assembly and the reduction transmission assembly are integrated as much as possible in the powertrain installation space inside the wheel hub, which has obvious advantages in terms of structural compactness, torque transmission capability, and motor efficiency.

[0028] In some embodiments, 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 relatively rotatably mounted on the second 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 assembly via 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.

[0029] In some embodiments, the wheel hub drive sleeve includes a mounting sleeve mounted on the second 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 connecting bolts.

[0030] In some embodiments, a motor shaft through hole compatible with the motor shaft is formed on the side of the reduction box assembly close to the motor housing assembly, a recessed surface on the side of the shaft mounting seat close to the motor shaft through hole is formed to form a recessed groove connected to the motor shaft through hole, a first half groove compatible with the first-stage driven gear is formed on the hole wall on the side of the motor shaft through hole close to the first-stage driven gear, a second half groove compatible with the first-stage driven gear is formed on the hole wall on the side of the baffle close to the first-stage driven gear, the second half groove and the first half groove together constitute a gear recessed gap compatible with the first-stage driven gear, and the first-stage driven gear partially extends into the gear recessed gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the wheel core electric drive system;

[0032] Figure 2 A schematic diagram of the matching relationship between the rear cover of the reduction gearbox and the second support shaft from one viewing angle;

[0033] Figure 3 A schematic diagram of the matching relationship between the rear cover of the reduction gearbox and the second support shaft from another perspective;

[0034] Figure 4 This is a schematic diagram of the structure of the rear cover of the reduction gearbox from one perspective;

[0035] Figure 5 This is a structural diagram of the rear cover of the reduction gearbox from another perspective;

[0036] Figure 6 It is a schematic structural diagram of the second support shaft. DETAILED DESCRIPTION

[0037] The utility model is further described below in conjunction with embodiments and drawings.

[0038] like Figure 1-Figure 6 As shown, a stable wheel core electric drive system housing that is easy to assemble mainly includes a motor housing assembly 1a that encloses a motor assembly chamber and a reduction box assembly 1b that encloses a reduction assembly chamber, that is, the motor housing assembly 1a constitutes a motor assembly chamber for installing a motor assembly 3, and the reduction box assembly 1b constitutes a reduction assembly chamber for installing a reduction transmission assembly 4. The motor housing assembly 1a and the reduction box assembly 1b are locked together by threaded fasteners, that is, the motor housing assembly 1a and the reduction box assembly 1b are tightly connected by threaded fasteners.

[0039] A first support shaft 1c extending away from the reduction box assembly 1b is installed on one side of the motor housing assembly 1a away from the reduction box assembly 1b. The reduction box assembly 1b is provided with a second support shaft 1d extending away from the motor housing assembly 1a, and the second support shaft 1d is coaxially arranged with the first support shaft 1c.

[0040] The end of the second support shaft 1d extending into the reduction assembly chamber is its inner end, and the end of the second support shaft 1d extending outside the reduction assembly chamber is its outer end. The inner end of the second support shaft 1d has a shaft mounting seat 1d1, and a shaft connecting seat 1b21 matched with the shaft mounting seat 1d1 is integrally formed on the inner wall of the reduction box assembly 1b. The shaft mounting seat 1d1 is locked on the shaft connecting seat 1b21 by a locking bolt 1e.

[0041] Specifically, the end face of the shaft mounting seat 1d1 is supported on the shaft connecting seat 1b21, and a plurality of bolt connecting holes 1d11 are provided on the shaft mounting seat 1d1. The shaft connecting seat 1b21 is provided with bolt insertion holes 1b21b corresponding to each bolt connecting hole 1d11 one by one. Each bolt insertion hole 1b21b is recessed on the outer surface of the reduction box assembly 1b to form a nut recess 1b21b1. Each locking bolt 1e is respectively passed through the corresponding bolt insertion hole 1b21b and tightened in the corresponding bolt connecting hole 1d11, and the outer end face of the nut of each locking bolt 1e is not higher than the notch position of the corresponding nut recess 1b21b1, that is, the nut of each locking bolt 1e will not affect the assembly between the housing assembly 1a and the reduction box assembly 1b. Therefore, each locking bolt 1e for fixing the second support shaft 1d is installed outside the reduction gearbox assembly 1b, which can facilitate debugging of the second support shaft 1d and improve the installation accuracy and convenience of the second support shaft 1d.

[0042] In addition, a stop platform 1b21a extending toward the shaft mounting seat 1d1 is integrally formed on the shaft connecting seat 1b21, and at least a portion of the circumferential outer wall of the shaft mounting seat 1d1 is supported on the stop platform 1b21a. By setting the stop platform 1b21a, reliable support can be provided for the second support shaft 1d, thereby greatly improving the installation stability of the second support shaft 1d, and at the same time improving the force-bearing capacity of the second support shaft 1d, thereby greatly reducing the risk of the second support shaft 1d loosening or breaking and falling off after long-term use.

[0043] See also Figure 1 The motor housing assembly 1a includes a motor housing main body 1a1 with a cylindrical structure, a motor housing first end cover 1a2 covering the end of the motor housing main body 1a1 away from the reduction gearbox assembly 1b, and a motor housing second end cover 1a3 covering the end of the motor housing main body 1a1 close to the reduction gearbox assembly 1b. The motor housing main body 1a1, the motor housing first end cover 1a2 and the motor housing second end cover 1a3 together form a motor assembly chamber.

[0044] The reduction gearbox assembly 1b includes a reduction gearbox body 1b1 and a reduction gearbox rear cover 1b2 covering the reduction gearbox body 1b1 on a side close to the second end cover 1a3 of the motor housing. The reduction gearbox body 1b1 and the reduction gearbox rear cover 1b2 together form a reduction gearbox assembly chamber.

[0045] The outer surface of the reduction gearbox rear cover 1b2 fits with the outer surface of the motor housing second end cover 1a3, and the motor housing body 1a1, the motor housing first end cover 1a2, the motor housing second end cover 1a3, the reduction gearbox body 1b1 and the reduction gearbox rear cover 1b2 are fastened together by threaded fasteners.

[0046] Therefore, the above-mentioned motor housing assembly 1a and reduction box assembly 1b constitute a split assembly structure, which not only requires partial disassembly during maintenance and replacement of parts, thereby improving the convenience of assembly and maintenance and reducing maintenance costs and time, but also each part can be reliably locked by threaded fasteners, thereby ensuring both the overall structural strength and reliability and the convenience of disassembly and assembly.

[0047] In this embodiment, the first support shaft 1c is installed on the first end cover 1a2 of the motor housing by fastening the grosgrain, and extends in the direction away from the motor housing main body 1a1, the shaft connecting seat 1b21 is integrally formed on the inner surface of the reduction gear box rear cover 1b2, the nut recesses 1b21b1 are recessed on the outer surface of the reduction gear box rear cover 1b2, the bolt insertion holes 1b21b pass through the reduction gear box rear cover 1b2 and the shaft connecting seat 1b21 along the thickness direction, and each locking bolt 1e is inserted into the bolt insertion hole 1b21b from the outside of the reduction gear box rear cover 1b2 and is locked in the bolt connection hole 1d11.

[0048] The threaded fasteners include a plurality of short bolts 1f and a plurality of long bolts 1g. The first end cover 1a2 of the motor housing is locked on the motor housing body 1a1 by a plurality of short bolts 1f, that is, a short bolt insertion hole matching the short bolt 1f is provided on the first end cover 1a2 of the motor housing, and a short bolt threaded hole matching the short bolt 1f is provided on the end surface of the motor housing body 1a1 close to the first end cover 1a2 of the motor housing, and each short bolt threaded hole corresponds to each short bolt insertion hole one by one, and each short bolt 1f is screwed into the corresponding short bolt threaded hole after passing through the corresponding short bolt insertion hole. The reduction box body 1b1, the reduction box rear cover 1b2 and the second end cover 1a3 of the motor housing are locked on the motor housing body 1a1 by a plurality of long bolts 1g. That is: a long bolt insertion hole compatible with the long bolt 1g is opened on the reduction box body 1b1, a long bolt first through hole compatible with the long bolt 1g is opened on the reduction box rear cover 1b2, a long bolt second through hole compatible with the long bolt 1g is opened on the second end cover 1a3 of the motor housing, and a long bolt threaded hole compatible with the long bolt 1g is opened on the end surface of the motor housing body 1a1 close to the second end cover 1a3 of the motor housing, each long bolt threaded hole, each long bolt first through hole, each long bolt second through hole corresponds to each long bolt insertion hole one by one, and each long bolt 1g passes through the corresponding long bolt insertion hole, the long bolt first through hole and the long bolt second through hole in turn and is tightened in the corresponding long bolt threaded hole.

[0049] See also Figure 2and Figure 4 A plurality of baffle reinforcing ribs 1b22 are provided between the baffle 1b21a and the circumferential inner wall of the reduction gearbox rear cover 1b2, which can effectively improve the structural strength of the baffle 1b21a and prevent the baffle 1b21a from deformation, damage and other problems, thereby further improving the reliability of the support for the shaft mounting seat 1d1.

[0050] Embodiment 2:

[0051] See also Figure 1-Figure 5 A wheel core electric drive system includes a wheel hub 2, a motor assembly 3, a reduction transmission assembly 4 and an easy-to-assemble stable wheel core electric drive system case of Example 1, the motor assembly 3 is installed in the motor assembly chamber, the reduction transmission assembly 4 is installed in the reduction assembly chamber, the motor shaft 3a of the motor assembly 3 is coaxially arranged with the first support shaft 1c and the second support shaft 1d, and the outer end of the motor shaft 3a penetrates into the reduction assembly chamber and drives the wheel hub 2 to rotate through the reduction transmission assembly 4 to realize the driving of the vehicle.

[0052] The wheel hub 2 protrudes toward one side to form a powertrain installation space 2a adapted to the motor housing assembly 1a and the reduction box assembly 1b, and the motor housing assembly 1a and the reduction box assembly 1b are at least partially located in the powertrain installation space 2a. Integrating the motor assembly 3 and the reduction transmission assembly 4 in the powertrain installation space 2a inside the wheel hub 2 as much as possible has obvious advantages in terms of structural compactness, torque transmission capability, and motor efficiency.

[0053] The reduction transmission assembly 4 includes an intermediate shaft 4a parallel to the motor shaft 3a, a primary driving gear 4b synchronously rotatedly mounted on the motor shaft 3a, a wheel hub driving sleeve 4c relatively rotatedly mounted on the second support shaft 1d, a secondary driven gear 4d synchronously rotatedly mounted on the wheel hub driving sleeve 4c, and a primary driven gear 4e synchronously rotatedly mounted on the intermediate shaft 4a, both ends of the intermediate shaft 4a are rotatably mounted on the reduction box assembly 1b through two bearings, the primary driving gear 4b is meshed with the primary driven gear 4e, the intermediate shaft 4a is formed with a secondary driving tooth 4a1 meshed with the secondary driven gear 4d, and 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.

[0054] 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.

[0055] The wheel hub driving sleeve 4c includes a mounting sleeve 4c1 sleeved on the second supporting shaft 1d 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 connecting 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.

[0056] In this embodiment, a motor shaft through hole 1b23 compatible with the motor shaft 3a is formed on the side of the reduction box component 1b close to the motor housing component 1a, and a recessed groove 1d12 connected to the motor shaft through hole 1b23 is formed on the surface of the shaft mounting seat 1d1 close to the motor shaft through hole 1b23; a first half groove 1b24 compatible with the first-stage driven gear 4e is formed on the hole wall on the side of the motor shaft through hole 1b23 close to the first-stage driven gear 4e; a second half groove 1b21c compatible with the first-stage driven gear 4e is formed on the hole wall on the side of the stop platform 1b21a close to the first-stage driven gear 4e, and the second half groove 1b21c and the first half groove 1b24 together constitute a gear recessed gap compatible with the first-stage driven gear 4e, and a portion of the first-stage driven gear 4e extends to the motor shaft through hole 1b23 and the recessed groove 1d12 through the gear recessed gap. The above design facilitates the assembly and matching of the primary driving gear 4b and the primary driven gear 4e.

[0057] Furthermore, the locking bolts 1e are distributed along the circumference of the motor shaft through hole 1b23 to improve the reliability of the locking shaft mounting seat 1d1.

[0058] In this embodiment, the motor assembly 3 further includes a rotor 3b which is synchronously rotated and sleeved on the motor shaft 3a, and a stator 3c which is 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 first support shaft 1c and the second support shaft 1d, and both ends of the motor shaft 3a are rotatably supported on the first end cover 1a2 and the second end cover 1a3 of the motor housing through two bearings, which is simple and reliable.

[0059] 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. A stable wheel core electric drive system case that is easy to assemble, comprising a motor housing assembly that encloses a motor assembly chamber and a reduction box assembly that encloses a reduction assembly chamber, the motor housing assembly and the reduction box assembly being locked together by threaded fasteners, a first support shaft extending in a direction away from the reduction box assembly being installed on a side of the motor housing assembly away from the reduction box assembly, the reduction box assembly being provided with a second support shaft extending in a direction away from the motor housing assembly, the inner end of the second support shaft extending into the reduction assembly chamber having a shaft mounting seat, a shaft connecting seat that is compatible with the shaft mounting seat being integrally formed on an inner wall of the reduction box assembly, the end face of the shaft mounting seat being supported on the shaft connecting seat, characterized in that: The shaft connecting seat is integrally formed with a stop platform extending toward the shaft mounting seat, and at least part of the circumferential outer wall of the shaft mounting seat is supported on the stop platform. The shaft mounting seat is provided with a plurality of bolt connecting holes, and the shaft connecting seat is provided with bolt insertion holes corresponding to each bolt connecting hole one by one. Each bolt insertion hole is recessed on the outer surface of the reduction box assembly to form a nut groove, and each locking bolt is respectively passed through the corresponding bolt insertion hole and tightened in the corresponding bolt connecting hole, and the outer end surface of the nut of each locking bolt is not higher than the notch position of the corresponding nut groove.

2. The easy-to-assemble stable wheel core electric drive system box according to claim 1, characterized in that: The motor housing assembly includes a motor housing body with a cylindrical structure, a first end cover of the motor housing covering an end of the motor housing body away from the reduction gear assembly, and a second end cover of the motor housing covering an end of the motor housing body close to the reduction gear assembly. The reduction gear assembly includes a reduction gear body and a reduction gear rear cover covering the reduction gear body close to the second end cover of the motor housing, the reduction gear rear cover is fitted with the second end cover of the motor housing, the motor housing body, the first end cover of the motor housing, the second end cover of the motor housing, the reduction gear body and the reduction gear rear cover are locked together by threaded fasteners, the first support shaft is mounted on the first end cover of the motor housing and extends in a direction away from the motor housing body, the shaft connecting seat is integrally formed on the inner surface of the reduction gear rear cover, the nut recesses are recessed on the outer surface of the reduction gear rear cover, and the bolt insertion holes pass through the reduction gear rear cover and the shaft connecting seat along the thickness direction.

3. The easy-to-assemble stable wheel core electric drive system box according to claim 2, characterized in that: The threaded fasteners include multiple short bolts and multiple long bolts. The first end cover of the motor housing is locked on the motor housing body by multiple short bolts, and the reduction box body, the reduction box rear cover and the second end cover of the motor housing are locked on the motor housing body by multiple long bolts.

4. The easy-to-assemble stable wheel core electric drive system box according to claim 2, characterized in that: A plurality of baffle reinforcement ribs are arranged between the baffle and the circumferential inner wall of the reduction box rear cover.

5. A wheel core electric drive system, characterized in that: It includes a wheel hub, a motor assembly, a reduction transmission assembly and an easily assembled stable wheel core electric drive system case as described in any one of claims 1 to 4, wherein the motor assembly is installed in a motor assembly chamber, the reduction transmission assembly is installed in the reduction assembly chamber, the motor shaft of the motor assembly is coaxially arranged with the first support shaft and the second support shaft, the outer end of the motor shaft penetrates into the reduction assembly chamber and drives the wheel hub to rotate through the reduction transmission assembly, the wheel hub protrudes to one side to form a powertrain installation space compatible with the motor housing assembly and the reduction box assembly, and the motor housing assembly and the reduction box assembly are at least partially located in the powertrain installation space.

6. The wheel core electric drive system according to claim 5, characterized in that: 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 driving sleeve relatively rotatably mounted on the second support shaft, a secondary driven gear synchronously rotatably mounted on the wheel hub driving sleeve, and a primary driven gear synchronously rotatably mounted on the intermediate shaft. Both ends of the intermediate shaft are rotatably mounted on the reduction box assembly 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. The wheel hub driving sleeve rotates synchronously with the wheel hub.

7. The wheel core electric drive system according to claim 6, characterized in that: The wheel hub drive sleeve includes a mounting sleeve sleeved on the second 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 connecting bolts.

8. The wheel core electric drive system according to claim 6, characterized in that: A motor shaft through hole compatible with the motor shaft is formed on the side of the reduction box assembly close to the motor housing assembly, and a recessed groove connected to the motor shaft through hole is formed on the surface of the shaft mounting seat close to the motor shaft through hole. A first half groove compatible with the primary driven gear is formed on the hole wall on the side of the motor shaft through hole close to the primary driven gear, and a second half groove compatible with the primary driven gear is formed on the hole wall on the side of the baffle close to the primary driven gear. The second half groove and the first half groove together constitute a gear recessed gap compatible with the primary driven gear, and part of the primary driven gear extends to the motor shaft through hole and the recessed groove through the gear recessed gap.

Images