An efficient heat dissipation type mid-mounted reduction motor with a centrifugal overrunning dual clutch system

Abstract

The present invention discloses a high-efficiency heat-dissipating mid-mounted reduction motor with a centrifugal overrunning dual-clutch system, which includes a housing, a motor shaft, a cooling fan, a rotor assembly, a stator assembly, a planetary reduction mechanism assembly, a centrifugal overrunning dual-clutch system, and a transmission sprocket. The cooling fan is fixed on one side of the motor shaft close to the insulating oil cooling tank. The stator assembly and the rotor assembly are arranged in the insulating oil cooling tank. The centrifugal overrunning dual-clutch system includes a centrifugal clutch, an overrunning clutch inner ring, and an overrunning clutch outer ring. The planetary reduction mechanism assembly is connected to the overrunning clutch outer ring. The transmission sprocket is sleeved on the overrunning clutch inner ring. When the overrunning clutch outer ring is clamped with the overrunning clutch inner ring, an overrunning clutch transmission is formed. When the centrifugal clutch is clamped with the overrunning clutch inner ring, a centrifugal clutch transmission is formed. The present invention can achieve high-efficiency heat dissipation, zero magnetic resistance gliding, obtain higher power, increase the riding mileage of the whole vehicle, extend the service life, and improve the riding experience.

Description

Technical Field

[0001] The present invention relates to a reduction motor, and more particularly to a high-efficiency heat-dissipating center-mounted reduction motor with a centrifugal overrunning double clutch system. Background Art

[0002] The following problems exist in the use of rear hub motors for electric motorcycles and electric mopeds in the prior art: 1. During the starting and climbing stages of the motor, the current in the main circuit of the vehicle's electrical system is large, and the power consumption is high, thus affecting the cruising range of the vehicle; 2. Due to the mechanical structure limitations of the motor, the output power is insufficient, and climbing is blocked, affecting the riding comfort; 3. When the motor climbs, the motor efficiency is low, and the power consumption is high, affecting the cruising range of the vehicle; 4. When the existing motor coasts without power, there is magnetic resistance inside the motor, affecting the riding range of the motor. Therefore, the motors for electric motorcycles and electric mopeds need to be further improved. Summary of the Invention

[0003] Aiming at the defects in the prior art, such as the large current and high power consumption in the main circuit of the electrical system of electric motorcycles and electric mopeds, and the insufficient output power, low efficiency, high power consumption, and internal magnetic resistance of the rear hub motors of existing electric motorcycles and electric mopeds, the present invention provides a new high-efficiency heat-dissipating center-mounted reduction motor with a centrifugal overrunning double clutch system.

[0004] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] A high-efficiency heat-dissipating center-mounted reduction motor with a centrifugal overrunning double clutch system, including a housing and a motor shaft. The motor shaft penetrates through the housing and is rotatably connected to the housing. An insulating oil cooling groove is provided on the housing. It further includes a radiator fan, a rotor assembly, a stator assembly, a planetary reduction mechanism assembly, a centrifugal overrunning double clutch system, and a speed-changing sprocket, which are sequentially sleeved on the motor shaft. The radiator fan is fixed on one side of the motor shaft close to the insulating oil cooling groove. The stator assembly and the rotor assembly are arranged in the insulating oil cooling groove. The stator assembly is fixed on the housing. The rotor assembly is coaxially arranged with the stator assembly. The planetary reduction mechanism assembly cooperates with the housing. The centrifugal overrunning double clutch system includes a centrifugal clutch, an overrunning clutch inner ring, and an overrunning clutch outer ring. The planetary reduction mechanism assembly is connected to the overrunning clutch outer ring. The speed-changing sprocket is sleeved on the overrunning clutch inner ring. When the overrunning clutch outer ring is clamped with the overrunning clutch inner ring, an overrunning clutch transmission is formed. When the centrifugal clutch is clamped with the overrunning clutch inner ring, a centrifugal clutch transmission is formed.

[0006] The present invention is fixedly installed in the middle part of the frame of an electric motorcycle or an electric moped, used to output power for the whole vehicle, drive the rear wheel to move through the way of a variable-speed sprocket-chain, so as to drive the whole vehicle to run. The present invention integrates a stator assembly, a rotor assembly, a planetary reduction mechanism assembly and a centrifugal overrunning dual clutch system in the same housing, having the advantages of novel structure, stable operation and reliable performance. In addition, when not powered on, there is no magnetic resistance between the present invention and the rear wheel, and the whole vehicle can achieve zero magnetic resistance coasting, improving the riding range of the whole vehicle.

[0007] A cooling fan is installed on one side of the insulating oil cooling tank. The cooling fan rotates synchronously with the motor shaft to achieve real-time air cooling. The stator assembly and the rotor assembly are arranged in the insulating oil cooling tank. After the insulating oil cooling tank is filled with cooling insulating oil, it can cool the stator assembly and the rotor assembly. Therefore, through the design of an efficient heat dissipation structure and in cooperation with the liquid oil cooling technology, the present invention can quickly and effectively reduce the temperature rise of each module inside the in-wheel reduction motor, improve the quality of the in-wheel reduction motor, extend the service life and improve the riding experience.

[0008] The planetary reduction mechanism assembly can obtain a large reduction ratio to obtain a large output power. The output end of the present invention is connected with a variable-speed sprocket, and the output power of the in-wheel reduction motor is transmitted to the rear wheel of the electric vehicle through sprocket-chain transmission, but not limited to the rear wheel, and can also be other working components, so as to drive the whole vehicle to move. The present invention can achieve two-stage reduction, further improving the power output from the in-wheel reduction motor to the rear wheel of the electric vehicle.

[0009] The interior of the present invention adopts the design of a centrifugal overrunning dual clutch system, which can achieve two different motion output modes during powered operation to meet various power and speed requirements needed to cope with different road conditions when riding an electric motorcycle or an electric moped. When the rotational speed of the in-wheel reduction motor is low, it is in the overrunning clutch transmission state, and the power is transmitted from the rotor assembly, the motor shaft, the planetary reduction mechanism assembly, the outer ring of the overrunning clutch and the inner ring of the overrunning clutch to the variable-speed sprocket in sequence. This overrunning clutch transmission output mode can obtain a high output power at a low rotational speed through the planetary reduction mechanism assembly, meeting the power requirements when the electric vehicle starts or rides uphill; when the rotational speed of the in-wheel reduction motor is high, it is in the centrifugal clutch transmission state, and the power is transmitted from the rotor assembly, the motor shaft, the centrifugal clutch and the inner ring of the overrunning clutch to the variable-speed sprocket in sequence. This centrifugal clutch transmission output mode can obtain a high output rotational speed, meeting the speed requirements when the electric vehicle rides stably on the road surface.

[0010] By improving the planetary reduction mechanism assembly, the centrifugal overrunning double clutch system and the variable speed sprocket transmission mechanical structure, it is possible to effectively improve the power of the mid-mounted reduction motor during starting and climbing, while ensuring that the overall vehicle electrical system of the electric motorcycle or electric moped outputs a relatively small current value, and ensuring that the mid-mounted reduction motor can still obtain a relatively large motor power output efficiency during climbing. Under the same conditions, it can effectively extend the battery usage time, increase the overall vehicle cruising range, and improve the comfort performance of the user's riding experience. At the same time, when the electric motorcycle or electric moped is riding on a flat road, the mid-mounted reduction motor can have a stable power output to ensure the user's riding experience.

[0011] Preferably, in the above-mentioned high-efficiency heat-dissipating mid-mounted reduction motor with a centrifugal overrunning double clutch system, the outer edge of the centrifugal clutch is provided with a first pawl, the inner edge of the inner ring of the overrunning clutch is provided with a first ratchet tooth, there are no less than two centrifugal blocks between the centrifugal clutch and the inner ring of the overrunning clutch, the centrifugal blocks are connected to the first pawl through springs, the first ratchet tooth is engaged with the first pawl in the centrifugal clutch transmission state, and the first ratchet tooth is disengaged from the first pawl in the overrunning clutch transmission state.

[0012] When the rotational speed of the centrifugal clutch is higher than a certain value, the centrifugal blocks are in an open state, and at the same time the first pawl is ejected. The ejected first pawl can be engaged with the first ratchet teeth on the inner peripheral surface of the inner ring of the overrunning clutch, so that the centrifugal clutch and the inner ring of the overrunning clutch rotate synchronously to achieve motion transmission and form centrifugal clutch transmission; when the rotational speed of the centrifugal clutch is lower than a certain value, the centrifugal blocks are in a contracted state, at this time the first pawl is compressed, and the centrifugal clutch and the inner ring of the overrunning clutch are disengaged to form overrunning clutch transmission. By using the above mechanical structure to transmit power, the rapid conversion between two different motion output modes can be quickly realized to meet the various power and speed requirements needed to cope with different road conditions during the riding of electric motorcycles or electric mopeds.

[0013] Preferably, in the above-mentioned high-efficiency heat-dissipating mid-mounted reduction motor with a centrifugal overrunning double clutch system, the outer edge of the inner ring of the overrunning clutch is provided with a second pawl, the inner edge of the outer ring of the overrunning clutch is provided with a second ratchet tooth, and the second pawl is engaged with the second ratchet tooth in the overrunning clutch transmission state.

[0014] When the rotational speed of the motor shaft is lower than a certain value, the second pawl on the inner ring of the overrunning clutch is in a popped state, the second pawl and the second ratchet tooth are engaged, and the inner ring of the overrunning clutch will follow the rotation of the outer ring of the overrunning clutch, so as to achieve accurate power transmission.

[0015] Preferably, in the above-mentioned high-efficiency heat-dissipating mid-mounted reduction motor with a centrifugal overrunning double clutch system, the centrifugal clutch is connected to the motor shaft through a spline or a flat key.

[0016] The centrifugal clutch ring is sleeved on the motor shaft and fixed on the motor shaft through spline or flat key connection to ensure that the centrifugal clutch and the motor shaft have the same rotational speed and direction.

[0017] Preferably, for the high-efficiency heat-dissipating mid-mounted reduction motor with a centrifugal overrunning double clutch system described above, the planetary reduction mechanism assembly includes a sun gear, planet gears, a positioning shaft, an internal gear ring, and a planetary carrier. The internal gear ring is engaged with the housing. The sun gear and the planetary carrier are sleeved on the motor shaft. Both ends of the positioning shaft are respectively fixed on the outer ring of the overrunning clutch and the planetary carrier. The planet gears are sleeved on the positioning shaft and meshed with the sun gear and the internal gear ring.

[0018] The present invention uses the planetary reduction mechanism assembly for output, which can obtain a larger reduction ratio to obtain greater output power.

[0019] Preferably, for the high-efficiency heat-dissipating mid-mounted reduction motor with a centrifugal overrunning double clutch system described above, a needle roller bearing is provided between the planet gear and the positioning shaft.

[0020] The planet gear is equipped with a needle roller bearing, and the needle roller bearing can bear a greater load compared to a ball bearing.

[0021] Preferably, for the high-efficiency heat-dissipating mid-mounted reduction motor with a centrifugal overrunning double clutch system described above, the number of the planet gears is not less than 3.

[0022] The number of the planet gears is not less than 3, which can achieve better power transmission and balanced force.

[0023] Preferably, for the high-efficiency heat-dissipating mid-mounted reduction motor with a centrifugal overrunning double clutch system described above, the housing is also provided with a partition board, a lubricating oil cooling groove, and a seal. The planetary reduction mechanism assembly and the centrifugal overrunning double clutch system are located in the lubricating oil cooling groove. The partition board is matched with the motor shaft through the seal.

[0024] The partition board divides the housing into an insulating oil cooling groove and a lubricating oil cooling groove. Injecting gear oil into the lubricating oil cooling groove can achieve gear lubrication and cooling. A seal is arranged in the middle of the partition board to prevent the oil from intermixing between the insulating oil cooling groove and the lubricating oil cooling groove.

[0025] Preferably, for the high-efficiency heat-dissipating mid-mounted reduction motor with a centrifugal overrunning double clutch system described above, the housing is also provided with a side cover with heat dissipation fins, and the side cover corresponds to the position of the cooling fan.

[0026] Heat dissipation ribs are designed on the outer side of the side cover to ensure that the heat generated by the stator assembly can be effectively dissipated through the side cover and the cooling fan, achieving real-time air cooling.

[0027] Preferably, for the high-efficiency heat dissipation type mid-mounted reduction motor with a centrifugal overrunning dual clutch system, the stator assembly includes a stator core, a stator bracket, and a coil winding. The coil winding is wound around the stator core, the stator core is fixed on the stator bracket, and one side surface of the stator bracket is fixed on the inner wall of the side cover.

[0028] The stator bracket is fixed on the side cover, and the connection between the stator bracket and the side cover forms a large-area contact of surface with surface, which can enhance the heat dissipation effect.

[0029] Preferably, for the high-efficiency heat dissipation type mid-mounted reduction motor with a centrifugal overrunning dual clutch system, the material of the stator bracket is aluminum alloy or magnesium alloy.

[0030] The stator bracket is preferably made of aluminum alloy or magnesium alloy, which has excellent heat dissipation performance and further improves the heat dissipation efficiency.

[0031] Preferably, for the high-efficiency heat dissipation type mid-mounted reduction motor with a centrifugal overrunning dual clutch system, a positioning bearing is provided between the stator bracket and the motor shaft and is limited by the positioning bearing.

[0032] The stator bracket is effectively positioned with the shaft shoulder on the motor shaft through the positioning bearing, thereby effectively ensuring the coaxiality requirement between the stator assembly and the rotor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic structural diagram of the present invention;

[0034] Figure 2 is an exploded view of the present invention;

[0035] Figure 3 is a schematic structural diagram of the centrifugal clutch and the inner ring of the overrunning clutch in the present invention;

[0036] Figure 4 is a schematic structural diagram of the present invention in the use state. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The following further describes the present invention in detail in conjunction with the appended Figures 1-4 drawings and specific embodiments, but they do not limit the present invention:

[0038] Embodiment 1

[0039] An efficient heat dissipation type mid-mounted reduction motor with a centrifugal overrunning double clutch system, comprising a housing 1 and a motor shaft 2. The motor shaft 2 penetrates through the housing 1 and is rotatably connected to the housing 1. An insulating oil cooling groove 11 is provided on the housing 1. It further includes a cooling fan 3, a rotor assembly 4, a stator assembly 5, a planetary reduction mechanism assembly 6, a centrifugal overrunning double clutch system 7, and a variable speed sprocket 8 that are sequentially sleeved on the motor shaft 2. The cooling fan 3 is fixed on the motor shaft 2 on one side close to the insulating oil cooling groove 11. The stator assembly 5 and the rotor assembly 4 are arranged in the insulating oil cooling groove 11. The stator assembly 5 is fixed on the housing 1. The rotor assembly 4 is coaxially arranged with the stator assembly 5. The planetary reduction mechanism assembly 6 cooperates with the housing 1. The centrifugal overrunning double clutch system 7 includes a centrifugal clutch 71, an overrunning clutch inner ring 72, and an overrunning clutch outer ring 73. The planetary reduction mechanism assembly 6 is connected to the overrunning clutch outer ring 73. The variable speed sprocket 8 is sleeved on the overrunning clutch inner ring 72. When the overrunning clutch outer ring 73 is clamped with the overrunning clutch inner ring 72, an overrunning clutch transmission is formed. When the centrifugal clutch 71 is clamped with the overrunning clutch inner ring 72, a centrifugal clutch transmission is formed.

[0040] The mid-mounted reduction motor is fixedly installed at the middle position of the whole vehicle frame. The variable speed sprocket 8 and the rear wheel 9 are power-transmitted through a sprocket and chain structure. When the stator assembly 5 is electrified, the rotor assembly 4 rotates, driving the motor shaft 2 to rotate, and then driving the planetary reduction mechanism assembly 6 and the centrifugal clutch 71 fixedly installed on the motor shaft 2 to rotate synchronously. At this time, there will be two different motion output modes:

[0041] When the rotational speed of the motor shaft 2 is low, the centrifugal clutch 71 and the overrunning clutch inner ring 72 are disengaged. Although the centrifugal clutch 71 rotates following the motor shaft 2, this rotation is not transmitted to the overrunning clutch inner ring 72. At the same time, since the planetary reduction mechanism assembly 6 rotates synchronously with the motor shaft 2, the planetary reduction mechanism assembly 6 drives the overrunning clutch outer ring 73 to rotate. The overrunning clutch outer ring 73 then clamps with the overrunning clutch inner ring 72, thereby driving the overrunning clutch inner ring 72 to rotate, synchronously driving the variable speed sprocket 8 to rotate, and finally the mid-mounted reduction motor outputs power outward. Higher output power is obtained through the planetary reduction mechanism assembly 6 at a lower rotational speed to meet the demand for higher power when the electric vehicle starts or rides uphill.

[0042] When the rotational speed of the motor shaft 2 is relatively high, the centrifugal clutch 71 and the inner ring 72 of the overrunning clutch are clamped, and the inner ring 72 of the overrunning clutch will rotate following the centrifugal clutch 71. At the same time, during the process of the rotation of the planetary reduction mechanism assembly 6 being transmitted to the inner ring 72 of the overrunning clutch, it experiences a first-stage planetary gear reduction. Therefore, the rotational speed transmitted from the planetary reduction mechanism assembly 6 to the inner ring 72 of the overrunning clutch is significantly lower than the rotational speed obtained from the transmission from the centrifugal clutch 71 to the inner ring 72 of the overrunning clutch. Due to the existence of the relative rotational speed difference, the inner ring 72 of the overrunning clutch and the outer ring 73 of the overrunning clutch are disengaged. At this time, although the planetary reduction mechanism assembly 6 is still rotating, this rotation is not transmitted to the inner ring 72 of the overrunning clutch. Therefore, the inner ring 72 of the overrunning clutch will rotate following the centrifugal clutch 71, synchronously driving the variable-speed sprocket 8 to rotate, and finally the mid-mounted reduction motor outputs power outward. This transmission output method can obtain a relatively high output rotational speed, meeting the requirements for a relatively high motor speed when an electric motorcycle or an electric moped is stably riding on the road surface.

[0043] Preferably, a first pawl 74 is provided on the outer edge of the centrifugal clutch 71, a first ratchet tooth 75 is provided on the inner edge of the inner ring 72 of the overrunning clutch, there are no less than two centrifugal blocks 76 between the centrifugal clutch 71 and the inner ring 72 of the overrunning clutch, the centrifugal blocks 76 are connected to the first pawl 74 through springs, the first ratchet tooth 75 is clamped with the first pawl 74 in the centrifugal clutch transmission state, and the first ratchet tooth 75 is disengaged from the first pawl 74 in the overrunning clutch transmission state.

[0044] Preferably, a second pawl 77 is provided on the outer edge of the inner ring 72 of the overrunning clutch, a second ratchet tooth 78 is provided on the inner edge of the outer ring 73 of the overrunning clutch, and the second pawl 77 meshes with the second ratchet tooth 78 in the overrunning clutch transmission state.

[0045] Preferably, the centrifugal clutch 71 and the motor shaft 2 are connected through a spline or a flat key.

[0046] Preferably, the planetary reduction mechanism assembly 6 includes a sun gear 61, a planetary gear 62, a positioning shaft 63, an internal gear ring 64, and a planetary carrier 65. The internal gear ring 64 is engaged with the housing 1. The sun gear 61 and the planetary carrier 65 are sleeved on the motor shaft 2. Both ends of the positioning shaft 63 are respectively fixed on the outer ring 73 of the overrunning clutch and the planetary carrier 65. The planetary gear 62 is sleeved on the positioning shaft 63 and meshes with the sun gear 61 and the internal gear ring 64.

[0047] Preferably, a needle roller bearing 66 is provided between the planetary gear 62 and the positioning shaft 63.

[0048] Preferably, the number of the planetary gears 62 is no less than 3.

[0049] Preferably, a partition plate 13, a lubricating oil cooling tank 12, and a seal 15 are further provided on the housing 1. The planetary reduction mechanism assembly 6 and the centrifugal overrunning dual clutch system 7 are located in the lubricating oil cooling tank 12. The partition plate 13 is engaged with the motor shaft 2 through the seal 15.

[0050] Preferably, a side cover 14 with heat dissipation fins is further provided on the housing 1, and the side cover 14 corresponds to the position of the heat dissipation fan 3.

[0051] Preferably, the stator assembly 5 includes a stator core 51, a stator bracket 52, and a coil winding 53. The coil winding 53 is wound around the stator core 51, the stator core 51 is fixed on the stator bracket 52, and one side surface of the stator bracket 52 is fixed on the inner wall of the side cover 14.

[0052] Preferably, the material of the stator bracket 52 is aluminum alloy or magnesium alloy.

[0053] Preferably, a positioning bearing 54 is provided between the stator bracket 52 and the motor shaft 2 and is limited by the positioning bearing 54.

[0054] The in - center reduction motor is fixedly installed at the middle position of the vehicle frame. The transmission sprocket 8 and the rear wheel 9 are power - transmitted through a sprocket - chain structure. The stator assembly 5 is fixedly installed on the side cover 14. A coil winding 53 is wound around the stator core 51 of the stator assembly 5. When the coil winding 53 is energized, the rotor assembly 4 rotates, synchronously driving the motor shaft 2 to rotate, and then driving the planetary reduction mechanism assembly 6 and the centrifugal clutch 71 fixedly installed on the motor shaft 2 to rotate synchronously. At this time, there will be two different motion output modes:

[0055] When the rotational speed of the motor shaft 2 is relatively low, the first pawl 74 of the centrifugal clutch 71 is in a contracted state, and the first pawl 74 is disengaged from the first ratchet tooth 75 of the overrunning clutch inner ring 72. Although the centrifugal clutch 71 rotates following the motor shaft 2, this rotation is not transmitted to the overrunning clutch inner ring 72. Meanwhile, since the sun gear 61 rotates synchronously with the motor shaft 2, the sun gear 61 transmits the rotation to the planet gear 62. The planet gear 62 rotates around the sun gear 61 while rotating on its own axis, and drives the planet carrier 65 and the overrunning clutch outer ring 73 to rotate synchronously. At this time, the second ratchet tooth 78 and the second pawl 77 are engaged, so the overrunning clutch outer ring 73 drives the overrunning clutch inner ring 72 to rotate, thereby driving the speed-changing sprocket 8 to rotate. Finally, the mid-mounted reduction motor outputs power outward. The order of motion output in the overrunning clutch transmission state is: stator assembly 5 - rotor assembly 4 - motor shaft 2 - sun gear 61 - planet gear 62 - planet carrier 65 - overrunning clutch outer ring 73 - overrunning clutch inner ring 72 - speed-changing sprocket 8. This transmission output method can obtain a relatively high output power at a relatively low rotational speed through the planetary reduction mechanism assembly 6, meeting the power requirements of the motor when the electric vehicle starts or climbs slopes.

[0056] When the rotational speed of the motor shaft 2 is relatively high, the first pawl 74 of the centrifugal clutch 71 is in a sprung state, and the first pawl 74 is engaged with the first ratchet tooth 75. The overrunning clutch inner ring 72 will rotate following the centrifugal clutch 71. Meanwhile, the motion transmission of the branch from the sun gear 61 to the planet carrier 65 still exists. However, since the rotation of the sun gear 61 is transmitted to the overrunning clutch inner ring 72 through a stage of planetary gear reduction, the rotational speed obtained from the sun gear 61 transmitted to the overrunning clutch inner ring 72 is significantly lower than the rotational speed obtained from the centrifugal clutch 71 transmitted to the overrunning clutch inner ring 72. Due to the existence of the relative rotational speed difference, the overrunning clutch inner ring 72 and the overrunning clutch outer ring 73 are disengaged. At this time, although the planetary reduction mechanism assembly 6 is still rotating, this rotation is not transmitted to the overrunning clutch inner ring 72. Therefore, the overrunning clutch inner ring 72 will rotate following the centrifugal clutch 71, thereby driving the speed-changing sprocket 8 to rotate. Finally, the mid-mounted reduction motor outputs power outward. The order of motion output in the centrifugal clutch transmission state is: stator assembly 5 - rotor assembly 4 - motor shaft 2 - centrifugal clutch 71 - overrunning clutch inner ring 72 - speed-changing sprocket 8. This transmission output method can obtain a relatively high output rotational speed, meeting the speed requirements of electric motorcycles or electric mopeds when riding stably on the road surface.

[0057] Which motion output mode the mid-mounted reduction motor is in mainly depends on the rotational speed of the rotor assembly 4. By simply reasonably setting the rotational speed critical value when the first pawl 74 of the centrifugal clutch 71 springs up, the mid-mounted reduction motor can meet the various power and speed requirements for different road conditions when riding an electric motorcycle or an electric moped.

[0058] The mechanical structure design of the present invention can achieve secondary speed change processing from the mid-mounted reduction motor to the rear wheel 9, that is, a set of speed change assembly can be compounded again. The speed change assembly adjusts the actual torque obtained by the rear wheel 9 according to the size of the speed change sprocket 8. In the case of climbing a slope, as long as the speed change assembly is adjusted, the torque output by the mid-mounted reduction motor can be amplified again. Therefore, with the same power consumption, the mid-mounted reduction motor can obtain a greater torque than the existing rear hub motor, improve the battery usage efficiency, and thus achieve the purpose of extending the cruising range.

[0059] A cooling fan 3 is installed on one side of the insulating oil cooling tank 11 of the housing 1. The cooling fan 3 rotates synchronously with the motor shaft 2 to achieve real-time air cooling. The stator assembly 5 and the rotor assembly 4 are arranged in the insulating oil cooling tank 11. Therefore, after the insulating oil cooling tank 11 is filled with cooling insulating oil, it can cool the stator assembly 5 and the rotor assembly 4. Therefore, through the efficient heat dissipation structure design and in cooperation with the liquid oil cooling technology, the present invention can quickly and effectively reduce the temperature rise of each module inside the mid-mounted reduction motor, improve the quality of the mid-mounted reduction motor, extend the service life, and improve the riding experience.

[0060] In summary, the above are only the preferred embodiments of the present invention. All equivalent changes and modifications made within the scope of the patent application of the present invention shall fall within the scope covered by the present invention.

Claims

1. An efficient heat dissipation type mid-mounted reduction motor with a centrifugal overrunning dual clutch system, comprising a housing (1) and a motor shaft (2). The motor shaft (2) penetrates through the housing (1) and is rotatably connected to the housing (1). Characterized in that: The housing (1) is provided with an insulating oil cooling tank (11). It further includes a cooling fan (3), a rotor assembly (4), a stator assembly (5), a planetary reduction mechanism assembly (6), a centrifugal overrunning dual clutch system (7), and a speed change sprocket (8) that are sequentially sleeved on the motor shaft (2). The cooling fan (3) is fixed on one side of the motor shaft (2) close to the insulating oil cooling tank (11). The stator assembly (5) and the rotor assembly (4) are arranged in the insulating oil cooling tank (11). The stator assembly (5) is fixed on the housing (1). The rotor assembly (4) is coaxially arranged with the stator assembly (5). The planetary reduction mechanism assembly (6) cooperates with the housing (1). The centrifugal overrunning dual clutch system (7) includes a centrifugal clutch (71), an overrunning clutch inner ring (72), and an overrunning clutch outer ring (73). The planetary reduction mechanism assembly (6) is connected to the overrunning clutch outer ring (73). The speed change sprocket (8) is sleeved on the overrunning clutch inner ring (72). When the overrunning clutch outer ring (73) is engaged with the overrunning clutch inner ring (72), an overrunning clutch transmission is formed. When the centrifugal clutch (71) is engaged with the overrunning clutch inner ring (72), a centrifugal clutch transmission is formed.

2. An efficient heat dissipation type mid-mounted reduction motor with a centrifugal overrunning dual clutch system according to claim 1, Characterized in that: The outer edge of the centrifugal clutch (71) is provided with a first pawl (74). The inner edge of the overrunning clutch inner ring (72) is provided with a first ratchet tooth (75). There are at least two centrifugal blocks (76) between the centrifugal clutch (71) and the overrunning clutch inner ring (72). The centrifugal blocks (76) are connected to the first pawl (74) through springs. In the centrifugal clutch transmission state, the first ratchet tooth (75) is engaged with the first pawl (74). In the overrunning clutch transmission state, the first ratchet tooth (75) is disengaged from the first pawl (74).

3. An efficient heat dissipation type mid-mounted reduction motor with a centrifugal overrunning dual clutch system according to claim 1, Characterized in that: The outer edge of the overrunning clutch inner ring (72) is provided with a second pawl (77). The inner edge of the overrunning clutch outer ring (73) is provided with a second ratchet tooth (78). In the overrunning clutch transmission state, the second pawl (77) is engaged with the second ratchet tooth (78).

4. An efficient heat dissipation type mid-mounted reduction motor with a centrifugal overrunning dual clutch system according to claim 1, Characterized in that: The centrifugal clutch (71) is connected to the motor shaft (2) through a spline or a flat key.

5. An efficient heat dissipation type mid-mounted reduction motor with a centrifugal overrunning dual clutch system according to claim 1, Characterized in that: The planetary reduction mechanism assembly (6) includes a sun gear (61), planetary gears (62), a positioning shaft (63), an internal gear ring (64), and a planetary carrier (65). The internal gear ring (64) is engaged with the housing (1). The sun gear (61) and the planetary carrier (65) are sleeved on the motor shaft (2). Both ends of the positioning shaft (63) are fixed to the outer ring of the overrunning clutch (73) and the planetary carrier (65) respectively. The planetary gears (62) are sleeved on the positioning shaft (63) and are engaged with the sun gear (61) and the internal gear ring (64).

6. The high-efficiency heat-dissipating in-line reduction motor with a centrifugal overrunning dual clutch system according to claim 5, characterized in that: A needle roller bearing (66) is provided between the planetary gear (62) and the positioning shaft (63).

7. The high-efficiency heat-dissipating in-line reduction motor with a centrifugal overrunning dual clutch system according to claim 6, characterized in that: The number of the planetary gears (62) is not less than 3.

8. The high-efficiency heat-dissipating in-line reduction motor with a centrifugal overrunning dual clutch system according to claim 1, characterized in that: The housing (1) is further provided with a partition plate (13), a lubricating oil cooling groove (12), and a seal (15). The planetary reduction mechanism assembly (6) and the centrifugal overrunning dual clutch system (7) are located in the lubricating oil cooling groove (12). The partition plate (13) is cooperated with the motor shaft (2) through the seal (15).

9. The high-efficiency heat-dissipating in-line reduction motor with a centrifugal overrunning dual clutch system according to claim 1, characterized in that: The housing (1) is further provided with a side cover (14) with heat-dissipating fins, and the side cover (14) corresponds to the position of the cooling fan (3).

10. The high-efficiency heat-dissipating in-line reduction motor with a centrifugal overrunning dual clutch system according to claim 9, characterized in that: The stator assembly (5) includes a stator core (51), a stator bracket (52), and a coil winding (53). The coil winding (53) is wound around the stator core (51). The stator core (51) is fixed to the stator bracket (52). One side surface of the stator bracket (52) is fixed to the inner wall of the side cover (14).

11. The high-efficiency heat-dissipating in-line reduction motor with a centrifugal overrunning dual clutch system according to claim 10, characterized in that: The material of the stator bracket (52) is aluminum alloy or magnesium alloy.

12. The high-efficiency heat-dissipating in-line reduction motor with a centrifugal overrunning dual clutch system according to claim 10, characterized in that: A positioning bearing (54) is provided between the stator bracket (52) and the motor shaft (2) and is limited by the positioning bearing (54).

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