A coaxial mid-drive motor with forward and reverse drive modes

Abstract

The present invention discloses a coaxial structure mid-mounted motor in a forward and reverse drive mode, comprising a housing, a left cover, a right cover, a motor shaft, a forward and reverse drive assembly, a planetary reduction mechanism, and a dual clutch system. A partition is provided on the housing, and the partition divides the accommodating chamber into a first chamber and a second chamber. The forward and reverse drive assembly is located in the first chamber, and the planetary reduction mechanism and the dual clutch system are located in the second chamber. One side of the planetary reduction mechanism is fixed on the partition, and the dual clutch system cooperates with the left cover, and the planetary reduction mechanism is detachably connected to the dual clutch system. The planetary reduction mechanism and the dual clutch system are annularly sleeved on the motor shaft and are coaxially arranged with the forward and reverse drive assembly. The present invention avoids the collision impact caused by the speed difference of the dual clutch system by controlling the forward and reverse rotation of the forward and reverse drive assembly and coordinating the transmission connection of the dual clutch system and the planetary reduction mechanism, thereby improving the output efficiency of the motor and the comfort performance of the customer's riding experience.

Description

Technical Field

[0001] The invention relates to a reduction motor, in particular to a coaxial mid-mounted motor in a forward and reverse drive mode. Background Art

[0002] The following problems exist in the use of rear-mounted hub motors for electric motorcycles and electric mopeds in the prior art: 1. The existing hub motor has a large main circuit current and high power consumption when starting and climbing a slope, which affects the vehicle's range; 2. The motor is not powerful enough, and climbing is hindered, affecting riding comfort; 3. The motor has low efficiency and high power consumption when climbing a slope, which affects the vehicle's range.

[0003] Therefore, electric motors for electric motorcycles and electric mopeds need to be further improved. Summary of the invention

[0004] The present invention aims at the defects of the hub motors of electric motorcycles and electric mopeds in the prior art, such as large power consumption and insufficient climbing power, and provides a new coaxial mid-mounted motor with forward and reverse drive modes.

[0005] In order to solve the above technical problems, the present invention is implemented by the following technical solutions:

[0006] A coaxial structure mid-mounted motor in a forward and reverse drive mode, comprising a housing, a left cover, a right cover, a motor shaft, and a forward and reverse drive assembly, wherein two ends of the housing respectively cooperate with the left cover and the right cover to form a accommodating chamber, the forward and reverse drive assembly is fixedly mounted on the inner wall of the right cover, the motor shaft passes through the left cover and cooperates with the forward and reverse drive assembly, and further comprises a planetary reduction mechanism and a dual clutch system, a partition is provided on the housing, the partition divides the accommodating chamber into a first chamber and a second chamber, the forward and reverse drive assembly is located in the first chamber, the planetary reduction mechanism and the dual clutch system are located in the second chamber, one side of the planetary reduction mechanism is fixed on the partition, the dual clutch system cooperates with the left cover, the planetary reduction mechanism is detachably connected to the dual clutch system, the planetary reduction mechanism and the dual clutch system are annularly sleeved on the motor shaft and coaxially arranged with the forward and reverse drive assembly.

[0007] In the above-mentioned coaxial structure with a motor, the housing, the left cover, and the right cover cooperate with each other to form the accommodating chamber of the present invention, which is used to accommodate other components. The forward and reverse drive assembly is used to output forward or reverse power, and transmit the power to the motor shaft to achieve speed control. The planetary reduction mechanism and the dual clutch system can output the speed of the motor shaft after speed change. The planetary reduction mechanism, the dual clutch system, and the forward and reverse drive assembly are coaxially arranged to transmit power more accurately.

[0008] The present invention can meet the power and speed requirements of the coaxial structure mid-mounted motor when starting and going uphill by controlling the forward and reverse rotation of the forward and reverse drive assembly, in conjunction with the transmission connection of the dual clutch system and the planetary reduction mechanism. In addition, by controlling the forward and reverse rotation of the forward and reverse drive assembly, the collision impact caused by the speed difference of the rigid structural parts of the dual clutch system is effectively avoided, and a smooth transition from low speed and high power to high speed and low power of the whole vehicle is achieved. At the same time, the power consumption of the coaxial structure mid-mounted motor in different riding states is also reduced, the output efficiency of the motor is improved, the vehicle's mileage is effectively increased, and the comfort performance of the customer's riding experience is improved.

[0009] In addition, cooling insulating oil can be added to the first chamber, and cooling lubricating oil can be added to the second chamber, which can quickly and effectively reduce the temperature rise of various components inside the coaxial structure mid-mounted motor, improve the quality of the motor, extend its service life, and improve the riding experience.

[0010] Preferably, in the above-mentioned forward and reverse drive mode, a coaxial structure with a central motor is provided, and the planetary reduction mechanism includes a sun gear, a planetary gear, a planetary gear positioning shaft, a planetary bracket, an inner ring gear, and a ring gear bracket. The sun gear ring is sleeved on the motor shaft and limited by a key connection. The planetary gears are respectively meshed with the sun gear and the inner ring gear, and the planetary bracket is fixed on the partition. One end of the planetary gear positioning shaft cooperates with the planetary bracket, the planetary gear positioning shaft is rotatably connected to the planetary gear, the ring gear bracket is rotatably connected to the motor shaft, and the inner ring gear is meshed with the ring gear bracket.

[0011] The sun gear is sleeved on the motor shaft and can rotate synchronously with the motor shaft to transmit power in real time. The planetary bracket is fixed on the partition to support the positioning shaft of the planetary gear. Through the meshing between the planetary gear, sun gear, inner ring gear and ring gear bracket, the power transmission from the sun gear to the ring gear bracket can be achieved, and a larger reduction ratio can be obtained to obtain a larger output power.

[0012] Preferably, in the above-mentioned coaxial structure mid-mounted motor in a forward and reverse drive mode, the dual-clutch system includes a centrifugal clutch inner ring, an overrunning clutch inner ring, and an overrunning clutch outer ring, the centrifugal clutch inner ring is sleeved on the motor shaft, the overrunning clutch outer ring is detachably connected to the gear ring bracket, the outer edge of the centrifugal clutch inner ring is provided with a first pawl, the inner edge of the overrunning clutch inner ring is provided with a first ratchet, the first pawl cooperates with the first ratchet, the outer edge of the overrunning clutch inner ring is provided with a second pawl, the inner edge of the overrunning clutch outer ring is provided with a second ratchet, the second pawl cooperates with the second ratchet.

[0013] The inner ring of the centrifugal clutch is sleeved on the motor shaft to achieve synchronous rotation with the motor shaft. The outer ring of the overrunning clutch is detachably connected to the ring gear bracket to achieve synchronous rotation with the ring gear bracket. The inner ring of the centrifugal clutch is sleeved on the motor shaft to achieve synchronous rotation with the motor shaft. The inner ring of the overrunning clutch and the inner ring of the centrifugal clutch are matched with ratchet pawls, so that the rotation speed of the inner ring of the centrifugal clutch can be transmitted to the inner ring of the overrunning clutch in one direction. The inner ring of the overrunning clutch and the outer ring of the overrunning clutch are matched with ratchet pawls, so that the rotation speed of the outer ring of the overrunning clutch can be transmitted to the inner ring of the overrunning clutch in one direction. The use of the above mechanical structure to transmit power can quickly realize the rapid conversion of different motion output modes to meet the various power and speed requirements required for different road conditions when riding electric motorcycles or electric mopeds.

[0014] Preferably, the motor is placed in the coaxial structure of the forward and reverse drive mode described above, and the forward and reverse drive assembly includes a stator assembly and a rotor assembly, one side of the stator assembly is fixed to the inner wall of the right cover, the stator assembly is rotatably connected to the motor shaft, the rotor assembly is sleeved on the motor shaft, and the stator assembly, the rotor assembly and the motor shaft are coaxially arranged.

[0015] One side of the stator assembly is fixed on the inner wall of the right cover, and the rotor assembly is sleeved on the motor shaft. When the motor in the coaxial structure is energized, the forward and reverse rotation of the rotor assembly is controlled, and the rotor assembly and the motor shaft are further rotated synchronously.

[0016] Preferably, the above-mentioned coaxial structure mid-mounted motor in a forward and reverse drive mode further includes a first bearing and a second bearing, and the stator assembly is coaxially arranged with the motor shaft through the cooperation of the first bearing and the second bearing.

[0017] The first bearing and the second bearing play the role of supporting and limiting the stator assembly, so that the stator assembly and the motor shaft always remain coaxial.

[0018] Preferably, in the above-mentioned coaxial structure of the forward and reverse drive mode, a central motor is provided, the motor shaft is provided with no less than 2 positioning holes, and the rotor assembly is coaxially arranged with the motor shaft by connecting with the positioning holes through screws.

[0019] The positioning hole serves as a positioning guide to ensure that the rotor assembly and the motor shaft always remain coaxial.

[0020] Preferably, in the above-mentioned coaxial structure of the forward and reverse drive mode, a central motor is installed, and an elastic centrifugal block is rotatably provided on the inner ring of the centrifugal clutch, and the elastic centrifugal block is connected to the first pawl.

[0021] When the clockwise speed of the inner ring of the centrifugal clutch is high, the elastic centrifugal block opens and drives the first pawl to rotate, so that the first pawl engages with the first ratchet tooth. When the inner ring of the centrifugal clutch rotates counterclockwise, the elastic centrifugal block contracts and closes, thereby realizing directional transmission of power.

[0022] Preferably, in the above-mentioned coaxial structure with a forward and reverse drive mode and a central motor, the right cover is provided with heat dissipation ribs.

[0023] The heat dissipation ribs can increase the cooling area of ​​the right cover, thereby achieving efficient heat dissipation.

[0024] Preferably, the above-mentioned coaxial structure mid-mounted motor in the forward and reverse drive mode further includes an O-ring, and the O-ring is provided at the connection between the box body and the left cover and the right cover.

[0025] The O-ring seals the box and prevents oil leakage due to gaps between the box body and the left and right covers.

[0026] Preferably, the coaxial mid-mounted motor in the forward and reverse drive mode described above further includes a sprocket, and the sprocket cooperates with the inner ring of the overrunning clutch.

[0027] The sprocket cooperates with the inner ring of the overrunning clutch, so that the inner ring of the overrunning clutch transmits power to the sprocket to achieve power output. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 An exploded view of the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of the dual clutch system in the present invention. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-3 The present invention is further described in detail with specific embodiments, but they are not limitations of the present invention:

[0032] Example 1

[0033] A coaxial structure mid-mounted motor in a forward and reverse drive mode, comprising a box body 1, a left cover 5, a right cover 2, a motor shaft 3, and a forward and reverse drive assembly 7. The two ends of the box body 1 respectively cooperate with the left cover 5 and the right cover 2 to form a receiving cavity. The forward and reverse drive assembly 7 is fixed on the inner wall of the right cover 2. The motor shaft 3 passes through the left cover 5 and cooperates with the forward and reverse drive assembly 7. It also includes a planetary reduction mechanism 6 and a dual clutch system 4. A partition 11 is provided on the box body 1, and the partition 11 divides the receiving cavity into The first chamber 12 and the second chamber 13 are formed by cutting, the forward and reverse drive assembly 7 is located in the first chamber 12, the planetary reduction mechanism 6 and the dual clutch system 4 are located in the second chamber 13, one side of the planetary reduction mechanism 6 is fixed on the partition 11, the dual clutch system 4 cooperates with the left cover 5, the planetary reduction mechanism 6 and the dual clutch system 4 are detachably connected, the planetary reduction mechanism 6 and the dual clutch system 4 are annularly sleeved on the motor shaft 3 and are coaxially arranged with the forward and reverse drive assembly 7.

[0034] When the central motor of the coaxial structure is energized, the forward and reverse drive assembly 7 can be controlled by an external control system to realize the switching of the forward and reverse states, clockwise for forward rotation and counterclockwise for reverse rotation. The forward and reverse drive control process of the central motor of the coaxial structure presents three motion states: starting or climbing low-speed state, gliding state, and steady high-speed driving state.

[0035] The power transmission path in the starting or climbing low-speed state is: forward and reverse drive component 7 reverse - planetary reduction mechanism 6 - dual clutch system 4 - power output. The power is output through the planetary reduction mechanism 6, which can enable the coaxial structure mid-mounted motor to obtain a larger output power when starting at a lower speed or climbing a slope.

[0036] After the above starting or climbing low speed state, the forward and reverse drive assembly 7 switches to forward rotation, and the planetary reduction mechanism 6 no longer provides power to the dual clutch system 4. The dual clutch system 4 itself has a certain forward rotation speed. At this time, the whole vehicle is in a gliding state.

[0037] Steady high-speed driving state: the power transmission path is: forward and reverse drive component 7 forward - dual clutch system 4 - power output. The forward rotation speed of the forward and reverse drive component 7 is directly transmitted through the dual clutch system 4, which can enable the whole vehicle to obtain a higher output speed when riding on a flat road.

[0038] Preferably, the planetary reduction mechanism 6 includes a sun gear 62, a planetary gear 65, a planetary gear positioning shaft 64, a planetary bracket 66, an inner ring gear 63, and a ring gear bracket 61. The sun gear 62 is sleeved on the motor shaft 3 and is limited by a key connection. The planetary gear 65 is respectively meshed with the sun gear 62 and the inner ring gear 63. The planetary bracket 66 is fixed on the partition 11. One end of the planetary gear positioning shaft 64 cooperates with the planetary bracket 66. The planetary gear positioning shaft 64 is rotatably connected to the planetary gear 65. The ring gear bracket 61 is rotatably connected to the motor shaft 3. The inner ring gear 63 is meshed with the ring gear bracket 61.

[0039] Preferably, the dual clutch system 4 includes a centrifugal clutch inner ring 43, an overrunning clutch inner ring 41, and an overrunning clutch outer ring 42, the centrifugal clutch inner ring 43 is sleeved on the motor shaft 3, the overrunning clutch outer ring 42 is detachably connected to the ring gear bracket 61, the outer edge of the centrifugal clutch inner ring 43 is provided with a first pawl 431, the inner edge of the overrunning clutch inner ring 41 is provided with a first ratchet 411, the first pawl 431 cooperates with the first ratchet 411, the outer edge of the overrunning clutch inner ring 41 is provided with a second pawl 412, the inner edge of the overrunning clutch outer ring 42 is provided with a second ratchet 421, the second pawl 412 cooperates with the second ratchet 421.

[0040] Preferably, the forward and reverse drive assembly 7 includes a stator assembly 72 and a rotor assembly 71, one side of the stator assembly 72 is fixed to the inner wall of the right cover 2, the stator assembly 72 is rotationally connected to the motor shaft 3, the rotor assembly 71 is sleeved on the motor shaft 3, and the stator assembly 72, the rotor assembly 71 and the motor shaft 3 are coaxially arranged.

[0041] Preferably, it further comprises a first bearing 32 and a second bearing 33 , and the stator assembly 72 is coaxially arranged with the motor shaft 3 through the cooperation of the first bearing 32 and the second bearing 33 .

[0042] Preferably, the motor shaft 3 is provided with no less than two positioning holes 31 , and the rotor assembly 71 is coaxially arranged with the motor shaft 3 by connecting with the positioning holes 31 via screws.

[0043] Preferably, an elastic centrifugal block 432 is rotatably provided on the inner ring 43 of the centrifugal clutch, and the elastic centrifugal block 432 is connected to the first pawl 431 .

[0044] Preferably, the right cover 2 is provided with heat dissipation ribs 21 .

[0045] Preferably, an O-ring 14 is further included, and the O-ring 14 is disposed at the connection between the box body 1 and the left cover 5 and the right cover 2 .

[0046] Preferably, a sprocket 44 is further included, and the sprocket 44 cooperates with the overrunning clutch inner ring 41 .

[0047] When the motor in the coaxial structure is powered on, the rotor assembly 71 can be controlled by an external control system to switch the rotor assembly 71 between forward and reverse rotation. Clockwise rotation is forward rotation, and counterclockwise rotation is reverse rotation. The forward and reverse rotation driving control process of the motor in the coaxial structure presents three motion states:

[0048] Starting or climbing low speed state: When the coaxial structure mid-mounted motor starts, the external control system first controls the rotor assembly 71 to reverse, driving the motor shaft 3 to reverse, and the sun gear 62 also reverses with the motor shaft 3. The rotation of the sun gear 62 is transmitted to the inner ring gear 63 through the planetary gear 65. At this time, the inner ring gear 63 is in forward rotation. Since the planetary support 66 is fixed on the partition 11, the inner ring gear 63 will drive the ring gear support 61 to rotate forward. The overrunning clutch outer ring 42 is detachably connected to the ring gear support 61, so that the overrunning clutch outer ring 42 and the ring gear support 61 rotate forward synchronously. Through the engagement of the second ratchet 412 with the second ratchet 421, the overrunning clutch outer ring 42 will drive the overrunning clutch inner ring 41 to rotate forward, and the reverse rotation of the rotor assembly 71 is transmitted to the outside through the overrunning clutch outer ring 42 and the overrunning clutch inner ring 41, so that the coaxial structure mid-mounted motor realizes power transmission.

[0049] The power transmission path is: the rotor assembly 71 reverses - the sun gear 62 reverses - the inner gear ring 63 and the overrunning clutch outer ring 42 forward - the overrunning clutch inner ring 41 forward. In the above state, the power is output through the planetary reduction mechanism 6, which can achieve a larger output power for the coaxial structure mid-mounted motor when starting at a low level or going uphill.

[0050] Sliding state: When the reverse speed of the rotor assembly 71 reaches the set value, the external control system will control the rotor assembly 71 to start forward rotation, the motor shaft 3 also rotates forward, and drives the sun gear 62 to rotate forward, and transmits the rotation to the inner ring gear 63 via the planetary gear 65. At this time, the inner ring gear 63 is reversed, and the inner ring gear 63 drives the ring gear bracket 61 to reverse, and the ring gear bracket 61 and the overrunning clutch outer ring 42 reverse synchronously. Since the second pawl 412 and the second ratchet 421 can only transmit in one direction, the second pawl 412 and the second ratchet 421 are disengaged at this time, and the overrunning clutch inner ring 41 and the overrunning clutch outer ring 42 are disengaged. After the above-mentioned starting or climbing low-speed state, the overrunning clutch inner ring 41 itself has a certain forward rotation speed, and the whole vehicle is in a forward sliding state.

[0051] Steady high-speed driving state: as the forward rotation speed of the rotor assembly 71 continues to increase, when the forward rotation speed reaches the set forward rotation threshold, the forward rotation threshold should be lower than the speed of the overrunning clutch inner ring 41 in the second motion state, the elastic centrifugal block 432 of the centrifugal clutch inner ring 43 opens, driving the first pawl 431 to open, at this time, the forward rotation speed of the overrunning clutch inner ring 41 is in a deceleration state, and the forward rotation speed of the centrifugal clutch inner ring 43 is in an acceleration state, when the forward rotation speed difference between the two approaches 0, the first pawl 431 of the centrifugal clutch inner ring 43 will engage with the first ratchet 411 of the overrunning clutch inner ring 41, the gliding state of the whole vehicle is terminated, and the forward rotation of the rotor assembly 71 is transmitted to the outside through the centrifugal clutch inner ring 43 and the overrunning clutch inner ring 41.

[0052] The power transmission path is: the rotor assembly 71 rotates forward - the centrifugal clutch inner ring 43 rotates forward - the first ratchet 431 engages with the first ratchet tooth 411 - the overrunning clutch inner ring 41 rotates forward. The above-mentioned stable high-speed driving state directly transmits the rotation of the rotor assembly 71 through the centrifugal clutch inner ring 43, which can achieve a higher output speed when the whole vehicle is riding on a flat road.

[0053] In conclusion, the above is only a preferred embodiment of the present invention, and all equivalent changes and modifications made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A coaxial structure mid-mounted motor in a forward and reverse drive mode, comprising a housing (1), a left cover (5), a right cover (2), a motor shaft (3), and a forward and reverse drive assembly (7), wherein two ends of the housing (1) respectively cooperate with the left cover (5) and the right cover (2) to form a receiving cavity, the forward and reverse drive assembly (7) is fixedly mounted on the inner wall of the right cover (2), the motor shaft (3) passes through the left cover (5) and cooperates with the forward and reverse drive assembly (7), and is characterized in that: It also includes a planetary reduction mechanism (6) and a dual clutch system (4), wherein a partition (11) is provided on the housing (1), wherein the partition (11) divides the accommodating chamber into a first chamber (12) and a second chamber (13), wherein the forward and reverse drive assembly (7) is located in the first chamber (12), wherein the planetary reduction mechanism (6) and the dual clutch system (4) are located in the second chamber (13), wherein one side of the planetary reduction mechanism (6) is fixed on the partition (11), wherein the dual clutch system (4) cooperates with the left cover (5), wherein the planetary reduction mechanism (6) and the dual clutch system (4) are detachably connected, wherein the planetary reduction mechanism (6) and the dual clutch system (4) are sleeved on the motor shaft (3) and are coaxially arranged with the forward and reverse drive assembly (7); The planetary reduction mechanism (6) comprises a sun gear (62), a planetary gear (65), a planetary gear positioning shaft (64), a planetary support (66), an inner ring gear (63), and a ring gear support (61); the sun gear (62) is sleeved on the motor shaft (3) and is limited by a key connection; the planetary gear (65) is respectively meshed with the sun gear (62) and the inner ring gear (63); the planetary support (66) is fixed on the partition (11); one end of the planetary gear positioning shaft (64) cooperates with the planetary support (66); the planetary gear positioning shaft (64) is rotatably connected to the planetary gear (65); the ring gear support (61) is rotatably connected to the motor shaft (3); and the inner ring gear (63) is meshed with the ring gear support (61); The dual clutch system (4) comprises a centrifugal clutch inner ring (43), an overrunning clutch inner ring (41), and an overrunning clutch outer ring (42); the centrifugal clutch inner ring (43) is sleeved on the motor shaft (3); the overrunning clutch outer ring (42) is detachably connected to the ring gear bracket (61); a first ratchet (431) is provided on the outer edge of the centrifugal clutch inner ring (43); a first ratchet (411) is provided on the inner edge of the overrunning clutch inner ring (41); the first ratchet (431) cooperates with the first ratchet (411); a second ratchet (412) is provided on the outer edge of the overrunning clutch inner ring (41); a second ratchet (421) is provided on the inner edge of the overrunning clutch outer ring (42); the second ratchet (412) cooperates with the second ratchet (421); The forward and reverse drive assembly (7) comprises a stator assembly (72) and a rotor assembly (71); one side of the stator assembly (72) is fixedly mounted on the inner wall of the right cover (2); the stator assembly (72) is rotationally connected to the motor shaft (3); the rotor assembly (71) is sleeved on the motor shaft (3); the stator assembly (72), the rotor assembly (71) and the motor shaft (3) are coaxially arranged; when the motor in the coaxial structure is powered on, the rotor assembly 71 can be controlled by an external control system to achieve forward and reverse state switching of the rotor assembly 71.

2. The coaxial mid-mounted motor in forward and reverse driving mode according to claim 1, characterized in that: It also comprises a first bearing (32) and a second bearing (33), and the stator assembly (72) is coaxially arranged with the motor shaft (3) through the cooperation of the first bearing (32) and the second bearing (33).

3. The coaxial mid-mounted motor in forward and reverse driving mode according to claim 1, characterized in that: The motor shaft (3) is provided with no less than two positioning holes (31), and the rotor assembly (71) is coaxially arranged with the motor shaft (3) by connecting the rotor assembly (71) with the positioning holes (31) via screws.

4. The coaxial mid-mounted motor in forward and reverse driving mode according to claim 1, characterized in that: An elastic centrifugal block (432) is rotatably provided on the inner ring (43) of the centrifugal clutch, and the elastic centrifugal block (432) is connected to the first ratchet pawl (431).

5. The coaxial mid-mounted motor in forward and reverse driving mode according to claim 1, characterized in that: The right cover (2) is provided with heat dissipation ribs (21).

6. The coaxial mid-mounted motor in forward and reverse driving mode according to claim 1, characterized in that: It also includes an O-type sealing ring (14), and the O-type sealing ring (14) is provided at the connection between the box body (1) and the left cover (5) and the right cover (2).

7. The coaxial mid-mounted motor in forward and reverse driving mode according to claim 1, characterized in that: It also includes a sprocket (44), wherein the sprocket (44) cooperates with the overrunning clutch inner ring (41).

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