CN115056906A - Middle shaft multi-gear speed changing motor power-assisted transmission mechanism - Google Patents

Abstract

The invention relates to a middle shaft multi-gear variable speed motor power-assisted transmission mechanism, which comprises: the automatic centrifugal speed change mechanism is sleeved on the first main shaft, the core assembly is sleeved on the second main shaft, the automatic centrifugal speed change mechanism comprises a speed change mechanism output part, a planetary transmission and an automatic centrifugal gear shift assembly, each planetary transmission comprises a central wheel, a planetary carrier, a gear ring and a planetary wheel, one of the planetary carrier of the lowest-speed planetary transmission, the gear ring of the highest-speed planetary transmission and the planetary carrier of the highest-speed planetary transmission is fixedly connected with the first main shaft, a first overrunning clutch is arranged between the planetary carrier of the lowest-speed planetary transmission and the speed change mechanism output part, the core assembly is provided with a core assembly output part, and the core assembly output part is in transmission connection with the speed change mechanism output part, thereby greatly improving riding stability.

Description

Power-assisted transmission mechanism of middle shaft multi-gear variable speed motor

[ technical field ] A

The invention relates to the field of electric power-assisted speed change mechanisms, in particular to a power-assisted transmission mechanism of a middle shaft multi-gear speed change motor.

[ background of the invention ]

Bicycles are a traditional industry, have a history of over 100 years, and due to the problems of environmental protection and traffic, bicycles become popular transportation and fitness tools for residents of all countries in the world, particularly developed countries, and the center of gravity of the bicycle industry in the world is being changed from a traditional transportation tool instead of walking to sports, mountain land and leisure.

The pure manpower of bicycle is trampled the words and is ridden comparatively labouredly, consequently in order to solve this technical problem, technical staff developed the bicycle of taking motor helping hand afterwards, and motor helping hand structure generally sets up on the rear wheel axle among the prior art to make the focus of whole car at the car rear, and then the stationarity of riding is influenced.

Therefore, it is necessary to provide a power transmission mechanism of a middle shaft multi-gear speed changing motor, which solves the above technical problems.

[ summary of the invention ]

In order to solve the problems, the invention aims to provide a middle shaft multi-gear speed change motor power-assisted transmission mechanism which is stable in riding and can realize multi-gear speed change.

In order to achieve the purpose, the invention adopts the technical scheme that: a kind of axis multi-gear variable speed electrical machinery helping hand drive motor constructs, including: the automatic centrifugal speed change mechanism comprises a speed change mechanism output part, at least two sets of planetary transmissions and at least two sets of automatic centrifugal gear shift assemblies, each set of automatic centrifugal gear shift assembly is correspondingly arranged between each set of planetary transmission and the speed change mechanism output part, the power output wheel is fixedly connected with the speed change mechanism output part, and a plurality of sets of planetary transmissions are sequentially arranged from a low-speed stage to a high-speed stage on the structural arrangement, every set of planetary transmission all includes sun gear, planet carrier, ring gear and planet wheel, and in every two sets of adjacent planetary transmission, one of them set of planetary transmission's ring gear and another set of planetary transmission's planet carrier form first subassembly, and several sets of planetary transmission's sun gear form second subassembly, second subassembly and casing fixed connection, one of them and first main shaft fixed connection in the planet carrier of lowest speed level planetary transmission, highest speed level planetary transmission's ring gear and highest speed level planetary transmission's the planet carrier three, be equipped with first freewheel clutch between lowest speed level planetary transmission's planet carrier and the speed change mechanism output, the core subassembly is equipped with core subassembly output, the transmission is connected between core subassembly output and the speed change mechanism output.

Preferably, the power-assisted transmission mechanism of the middle shaft multi-gear speed change motor is further configured as follows: each set of automatic centrifugal gear shifting assembly comprises a pawl frame, a ratchet wheel, at least two centrifugal linkage members, at least one pawl member, at least one balance member, a first elastic member for controlling the initial position of the pawl member and a second elastic member for controlling the centrifugal linkage members, wherein the pawl frame is fixedly connected with or integrally formed with the output member of the speed change mechanism, the ratchet wheel is arranged on the first assembly member or a gear ring of the highest-speed planetary transmission, the centrifugal linkage members and the pawl members are rotatably arranged on the pawl frame through a first pin, the first elastic member is arranged on the first pin, the second elastic member is arranged on the pawl frame through a second pin, the balance members are connected between the two adjacent centrifugal linkage members, the centrifugal linkage members are provided with counterweight parts, the pawl members are provided with pawl parts meshed with the ratchet wheels, and when the counterweight parts rotate to be close to the ratchet wheel, the pawl part rotates to be away from the ratchet wheel and is disengaged from the ratchet wheel, and when the counterweight part rotates to be away from the ratchet wheel, the pawl part rotates to be close to the ratchet wheel and is engaged with the ratchet wheel.

Preferably, the power-assisted transmission mechanism of the middle shaft multi-gear speed change motor is further configured as follows: the core sub-assembly includes motor sub-assembly and speed reduction sub-assembly, the motor sub-assembly includes motor stator and electric motor rotor, motor stator with casing fixed connection, the electric motor rotor cover is located on the second main shaft and can rotates for the second main shaft, the speed reduction sub-assembly includes speed reduction centre wheel, speed reduction planet carrier, speed reduction ring gear and speed reduction planet wheel, speed reduction centre wheel and motor rotor fixed connection, speed reduction ring gear with casing fixed connection, speed reduction planet carrier do core sub-assembly output.

Preferably, the power-assisted transmission mechanism of the middle shaft multi-gear speed-changing motor is further configured as follows: the first main shaft is provided with a first gear, the second main shaft is provided with a second gear, the first gear is meshed with the second gear, a second overrunning clutch is arranged between the second gear and the output part of the core assembly, the output part of the speed change mechanism is fixedly connected with the first gear, or the second gear is fixedly connected with the output part of the core assembly, and the second overrunning clutch is arranged between the output part of the speed change mechanism and the first gear.

Preferably, the power-assisted transmission mechanism of the middle shaft multi-gear speed change motor is further configured as follows: the automatic transmission mechanism is characterized in that a first transmission wheel is arranged on the first main shaft, a second transmission wheel is arranged on the second main shaft, the first transmission wheel and the second transmission wheel are transmitted through a transmission part, a second overrunning clutch is arranged between the second transmission wheel and an output part of the core assembly, the output part of the speed change mechanism is fixedly connected with the first transmission wheel, or the second transmission wheel is fixedly connected with the output part of the core assembly, and the second overrunning clutch is arranged between the output part of the speed change mechanism and the first transmission wheel.

Preferably, the power-assisted transmission mechanism of the middle shaft multi-gear speed-changing motor is further configured as follows: the transmission part is a transmission belt or a chain, and the transmission wheel is a belt wheel or a chain wheel.

Preferably, the power-assisted transmission mechanism of the middle shaft multi-gear speed change motor is further configured as follows: the output member of the speed change mechanism protrudes out of the shell, and the power output wheel is arranged on the part of the speed change mechanism protruding out of the shell.

Preferably, the power-assisted transmission mechanism of the middle shaft multi-gear speed change motor is further configured as follows: the power output wheel is a chain wheel.

Preferably, the power-assisted transmission mechanism of the middle shaft multi-gear speed change motor is further configured as follows: the first main shaft is connected with the shell through a bearing.

Compared with the prior art, the invention has the following beneficial effects: the invention has made the centre of gravity of the car locate at the middle position through setting up the structure of helping hand of the electrical machinery on the mean axis, thus has greatly improved and ridden the stability, in addition the invention has carried on the corresponding improvement to the structure of the mean axis in order to adapt to the structure of helping hand of the electrical machinery to mount on the mean axis, the drive mechanism in the invention can realize the speed change of the multi-step, and make and ride and step on frequently in the normal range, so can realize the low-speed start, can realize the high-speed is ridden.

[ description of the drawings ]

Fig. 1 is a schematic structural diagram of a power transmission mechanism of a middle shaft multi-gear speed change motor in embodiment 1 of the present invention.

Fig. 2 is a schematic sectional structure view of a power transmission mechanism of a middle shaft multi-speed variable speed motor in embodiment 1 of the present invention.

Fig. 3 is an exploded schematic view of a power transmission mechanism of a middle shaft multi-speed variable speed motor in embodiment 1 of the present invention.

Fig. 4 is a schematic structural view of the first automatic centrifugal shift assembly in embodiment 1 of the present invention.

Fig. 5 is a schematic structural view of a second automatic centrifugal shift assembly in embodiment 1 of the present invention.

Fig. 6 is a schematic sectional structure view of a power transmission mechanism of a middle shaft multi-speed variable speed motor in embodiment 2 of the present invention.

Fig. 7 is an exploded schematic view of a power transmission mechanism of a middle shaft multi-speed variable speed motor in embodiment 2 of the present invention.

Fig. 8 is a schematic structural view of the first automatic centrifugal shift assembly in embodiment 2 of the present invention.

Fig. 9 is a schematic structural view of a second automatic centrifugal shift assembly in embodiment 2 of the invention.

Fig. 10 is a schematic structural view of a third automatic centrifugal shift assembly in embodiment 2 of the invention.

In fig. 1 to 5: 1. a housing, 2, a first main shaft, 20, a first transmission wheel, 21, a transmission member, 3, a second main shaft, 30, a second transmission wheel, 4, an automatic centrifugal speed change mechanism, 40, a speed change mechanism output, 400, a first overrunning clutch, 41, a first planetary transmission, 410, a first sun wheel, 411, a first planet carrier, 412, a first ring gear, 413, a first planet wheel, 42, a second planetary transmission, 420, a second sun wheel, 421, a second planet carrier, 422, a second ring gear, 423, a second planet wheel, 43, a first automatic centrifugal gear shift assembly, 430, a first pawl carrier, 431, a first ratchet wheel, 432, a first centrifugal linkage, 4320, a first counterweight, 433, a first pawl member, 4330, a first pawl portion, 434, a first balance member, 435, a first elastic member, 436, a second elastic member, 437, a first pin, 438, a second centrifugal pin, 44, a second automatic centrifugal gear shift assembly, 440. second pawl holder, 441, second ratchet, 442, second eccentric linkage, 443, second pawl, 444, second balance, 445, third elastic element, 446, fourth elastic element, 5, power take-off wheel, 6, movement assembly, 60, motor assembly, 600, motor stator, 601, motor rotor, 61, reduction assembly, 610, reduction center wheel, 611, reduction planet carrier, 612, reduction ring gear, 613, reduction planet gear, 7, first assembly, 8, second assembly.

In fig. 6 to 10: 1. housing, 2, first main shaft, 20, first drive wheel, 21, transmission piece, 3, second main shaft, 30, second drive wheel, 4, automatic centrifugal gear shift mechanism, 40, gear shift mechanism output, 400, first overrunning clutch, 41, first planetary transmission, 410, first sun wheel, 411, first planet carrier, 412, first ring gear, 413, first planet wheel, 42, second planetary transmission, 420, second sun wheel, 421, second planet carrier, 422, second ring gear, 423, second planet wheel, 43, third planetary transmission, 430, third sun wheel, 431, third planet carrier, 432, third ring gear, 433, third planet wheel, 44, first automatic centrifugal gear shift assembly, 440, first ratchet carrier, 441, first ratchet wheel, 442, first centrifugal link, 4420, first counterweight, 443, first ratchet piece, 4430, first pawl portion, 444. first balance, 445, first spring, 446, second spring, 447, first pin, 448, second pin, 45, second automatic centrifugal shift assembly, 450, second pawl carrier, 451, second ratchet, 452, second centrifugal linkage, 453, second pawl, 454, second balance, 455, third spring, 456, fourth spring, 46, third automatic centrifugal shift assembly, 460, third pawl carrier, 461, third ratchet, 462, third centrifugal linkage, 463, third pawl, 464, third balance, 465, fifth spring, 466, sixth spring, 5, power take-off wheel, 6, movement assembly, 60, motor assembly, 600, motor stator, 601, motor rotor, 61, reduction assembly, 610, center wheel, 611, reduction planet carrier, 612, ring gear, 613, planet gear, 7. a first assembly, 8, a second assembly, 9, a third assembly.

[ detailed description ] embodiments

The present invention provides a power transmission mechanism of a middle shaft multi-gear speed changing motor, which is further described in detail by specific embodiments.

Example 1

Referring to fig. 1 to 5, a power transmission mechanism of a middle shaft multi-gear speed-changing motor comprises: the automatic centrifugal speed changing device comprises a shell 1, a first main shaft 2, a second main shaft 3, an automatic centrifugal speed changing mechanism 4, a power output wheel 5, a movement assembly 6 and a treading piece (not shown), wherein the first main shaft 2 is arranged on the shell 1 and can rotate relative to the shell 1, and the first main shaft 2 is connected with the shell 1 through a bearing. The second main shaft 3 is arranged on the shell 1 and is parallel to the first main shaft 2, the automatic centrifugal speed change mechanism 4 is sleeved on the first main shaft 2, the treading pieces are arranged at two ends of the first main shaft 2, and the core assembly 6 is sleeved on the second main shaft 3. The first main shaft 2 protrudes out of the housing 1, and in the present embodiment, the power output wheel 5 is a sprocket.

The automatic centrifugal speed change mechanism 4 includes a speed change mechanism output member 40, two sets of planetary transmissions (i.e., a first planetary transmission 41 and a second planetary transmission 42) and two sets of automatic centrifugal gear shift assemblies (i.e., a first automatic centrifugal gear shift assembly 43 and a second automatic centrifugal gear shift assembly 44), the speed change mechanism output member 40 protrudes out of the housing 1, and the power output wheel 5 is disposed on a portion of the speed change mechanism output member 40 protruding out of the housing 1. The first automatic centrifugal shift assembly 43 is disposed between the first planetary transmission 41 and the variator output 40, the second automatic centrifugal shift assembly 44 is disposed between the second planetary transmission 42 and the variator output 40, the power output wheel 5 is fixedly connected to the variator output 40, and a plurality of sets of planetary transmissions are sequentially arranged from a low speed stage to a high speed stage in the structural arrangement, in this embodiment, because there are only two sets of planetary transmissions, the first planetary transmission 41 is a low speed planetary transmission, the second planetary transmission 42 is a high speed planetary transmission, the first planetary transmission 41 is disposed on the left, the second planetary transmission 42 is disposed on the right, the first planetary transmission 41 includes a first sun gear 410, a first carrier 411, a first ring gear 412 and a first planet gear 413, and the second planetary transmission 42 includes a second sun gear 420, Second planet carrier 421, second ring gear 422 and second planet wheel 423, first ring gear 412 forms first subassembly 7 with second planet carrier 421, first centre wheel 410 forms second subassembly 8 with second centre wheel 420, second subassembly 8 and casing 1 fixed connection, be equipped with first freewheel clutch 400 between first planet carrier 411 and the speed change mechanism output 40, first main shaft 2 and second ring gear 422 fixed connection.

The first automatic centrifugal shifting assembly 43 includes a first pawl frame 430, a first ratchet wheel 431, at least two first centrifugal linkages 432, at least one first pawl 433, at least one first balance 434, a first elastic member 435 for controlling an initial position of the first pawl 433, and a second elastic member 436 for controlling the first centrifugal linkage 432, the first centrifugal linkage 432 and the first pawl 433 are rotatably mounted on the first pawl frame 430 by a first pin 437, the first elastic member 435 is mounted on the first pin 437, the second elastic member 436 is mounted on the first pawl frame 430 by a second pin 438, the first balance 434 is connected between two adjacent first centrifugal linkages 432, the first centrifugal linkage 432 is provided with a first weight portion 4320, the first pawl 433 is provided with a first pawl portion 4330 engaged with the first ratchet wheel 431, when the first weight part 4320 rotates close to the first ratchet 431, the first pawl part 4330 rotates away from the first ratchet 431 and out of engagement with the first ratchet 431, and when the first weight part 4320 rotates away from the first ratchet 431, the first pawl part 4330 rotates close to the first ratchet 431 and into engagement with the first ratchet 431. The first pawl frame 430 is fixedly connected to or integrally formed with the transmission output member 40, the first ratchet 431 is disposed on the first assembly 7, and the second automatic centrifugal shift assembly 44 has the same structure as the first automatic centrifugal shift assembly 43, and includes: a second pawl frame 440, a second ratchet wheel 441, at least two second eccentric linkages 442, at least two second pawl 443, at least one second balance member 444, a third elastic member 445 for controlling the initial position of the second pawl 443, and a fourth elastic member 446 for controlling the second eccentric linkage 442, wherein the second pawl frame 440 is fixedly connected with or integrally formed with the gearshift mechanism output member 40, and the second ratchet wheel 441 is disposed on the second ring gear 422.

The core assembly 6 comprises a motor assembly 60 and a speed reduction assembly 61, the motor assembly 60 comprises a motor stator 600 and a motor rotor 601, the motor stator 600 is fixedly connected with the housing 1, the motor rotor 601 is sleeved on the second spindle 3 and can rotate relative to the second spindle 3, the speed reduction assembly 61 comprises a speed reduction center wheel 610, a speed reduction planet carrier 611, a speed reduction gear ring 612 and a speed reduction planet gear 613, the speed reduction center wheel 610 is fixedly connected with the motor rotor 601, the speed reduction gear ring 612 is fixedly connected with the housing 1, the speed reduction planet carrier 611 is a core assembly output part, the speed reduction planet carrier 611 is in transmission connection with the speed change mechanism output part 40, the first spindle 2 is provided with a first transmission wheel 20, the second spindle 3 is provided with a second transmission wheel 30, and the first transmission wheel 20 is in transmission with the second transmission wheel 30 through a transmission piece 21, in this embodiment, the second transmission wheel 30 is fixedly connected to the output member of the movement assembly (i.e. the reduction carrier 611), and a second overrunning clutch is disposed between the output member 40 of the speed change mechanism and the first transmission wheel 20. In other embodiments, the second overrunning clutch is disposed between the second transmission wheel 30 and the reduction carrier 611, and the output member 40 of the speed change mechanism is fixedly connected to the first transmission wheel 20, which can also be implemented in the present invention, in this embodiment, the first transmission wheel 20 and the second transmission wheel 30 are both belt wheels, and the transmission member 21 is a transmission belt, but in other embodiments, the first transmission wheel 20 and the second transmission wheel 30 can also be chain wheels, and the transmission member 21 is a chain, or the first transmission wheel 20 and the second transmission wheel 30 are both gears, and both are directly engaged with each other, and the transmission member 21 is not disposed.

The working principle of the middle shaft multi-gear speed change motor power-assisted transmission mechanism in the embodiment is as follows: in a low gear, the first spindle 2 is driven to rotate by a manual treading part, because the second ring gear 422 is fixedly connected with the first spindle 2, the first spindle 2 drives the second ring gear 422 to rotate, the second ring gear 422 drives the second planet carrier 421 to rotate through the meshing transmission of the second planet wheel 423, because the second planet carrier 421 and the first ring gear 412 form a first assembly, the first ring gear 412 rotates synchronously, the first ring gear 412 drives the first planet carrier 411 to rotate through the meshing transmission of the first planet wheel 413, because the first planet carrier 411 drives the speed change mechanism output part 40 to rotate through the first overrunning clutch 400, because the power output wheel 5 is fixedly connected with the speed change mechanism output part 40, the power output wheel 5 rotates synchronously to output power, the process is a two-stage speed reduction power output, in a medium gear, when the speed of the speed change mechanism output part 40 reaches a certain value, the first centrifugal link 432 of the first automatic centrifugal shift assembly 43 releases the first pawl 433 under the action of centrifugal force, so that the first pawl 433 is engaged with the first ratchet 431, the manual pedaling drives the first spindle 2 to rotate, because the second ring gear 422 is fixedly connected with the first spindle 2, the first spindle 2 drives the second ring gear 422 to rotate, the second ring gear 422 drives the second planet carrier 421 to rotate through the engagement transmission of the second planet gear 423, because the second planet carrier 421 and the first ring gear 412 form the first assembly 7, the first ratchet 431 is arranged on the outer circumferential surface of the first assembly 7, so that the first assembly 7 drives the first pawl 433 and the first pawl frame 430 to simultaneously rotate, because the first pawl frame 430 is fixedly connected with the speed change mechanism output member 40, the speed change mechanism output member 40 is fixedly connected with the power output wheel 5, and therefore the power output wheel 5 synchronously rotates, and outputting power, wherein the process is the first-stage deceleration output power, and the first overrunning clutch 400 follows. In high gear, when the speed of the variator output 40 reaches a higher value, the second centrifugal linkage 442 of the second automatic centrifugal shifting assembly 44 releases the second pawl 443 under the action of centrifugal force, so that the second pawl 443 is engaged with the second ratchet wheel 441, and the manual pedal drives the first main shaft 2 to rotate, because the second gear 422 is fixedly connected with the first spindle 2, the first spindle 2 drives the second gear 422 to rotate, since the second ratchet wheel 441 is disposed on the outer circumferential surface of the second ring gear 422, the second ring gear 422 drives the second pawl 443 and the second pawl frame 440 to rotate, since the second pawl carrier 440 is fixedly attached to the variator output 40, the variator output 40 is in turn fixedly attached to the pto wheel 5, therefore, the power take-off wheel 5 rotates synchronously to output power, and the process is the same speed power output, and the first overrunning clutch 400 and the first centrifugal gear-shifting assembly 43 follow up. The motor can assist power when being pedaled by manpower, the motor rotor 601 drives the speed reducing central wheel 610 to rotate, the speed reducing central wheel 610 drives the speed reducing planet carrier 611 to rotate through the meshing transmission of the speed reducing planet wheel 613, the speed reducing planet carrier 611 and the second transmission wheel 30 are fixedly connected, so the speed reducing planet carrier 611 drives the second transmission wheel 30 to rotate, the second transmission wheel 30 drives the first transmission wheel 20 to rotate through the transmission of the transmission piece 21, and the speed change mechanism output piece 40 is fixedly connected with the power output wheel 5 due to the fact that the second overrunning clutch is arranged between the first transmission wheel 20 and the speed change mechanism output piece 40, so the power output wheel 5 synchronously rotates and outputs power.

Although the first main shaft 2 is fixedly connected to the second ring gear 422 in this embodiment, in other embodiments, the first main shaft 2 may also be fixedly connected to the first carrier 411 or the second carrier 421 to implement the present invention, and when the first main shaft 2 is fixedly connected to the first carrier 411, the transmission path thereof is: during the low-speed gear, the manpower is stepped on and is trampled the piece and drive first main shaft 2 and rotate, because first planet carrier 411 and first main shaft 2 fixed connection, consequently first main shaft 2 drives first planet carrier 411 and rotates, because be equipped with first freewheel clutch 400 between first planet carrier 411 and speed change mechanism output 40, consequently first planet carrier 411 drives speed change mechanism output 40 through first freewheel clutch 400 and rotates, because speed change mechanism output 40 is again with power take off wheel 5 fixed connection, therefore power take off wheel 5 rotates in step, output power. In the middle gear, when the speed of the transmission mechanism output member 40 reaches a certain value, the first centrifugal link 432 of the first automatic centrifugal shift assembly 43 releases the first pawl 433 under the action of centrifugal force, so that the first pawl 433 is engaged with the first ratchet 431, the manual pedal drives the first spindle 2 to rotate, the first spindle 2 drives the first planet carrier 411 to rotate due to the fixed connection of the first planet carrier 411 and the first spindle 2, the first planet carrier 411 drives the first ring gear 412 to rotate through the engagement transmission of the first planet gears 413, the second planet carrier 421 and the first ring gear 412 form the first assembly 7, the first ratchet 431 is arranged on the outer circumferential surface of the first assembly 7, so that the first assembly 7 drives the first pawl 433 and the first pawl carrier 430 to rotate synchronously, and the first pawl carrier 430 is fixedly connected with the transmission mechanism output member 40, the variator output member 40 is in turn fixedly connected to the pto 5 so that the pto 5 rotates synchronously to output power while the first overrunning clutch 400 is in follow-up. In high gear, when the speed of the transmission mechanism output element 40 reaches a higher value, the second centrifugal link 442 of the second automatic centrifugal shift assembly 44 releases the second pawl 443 under the action of centrifugal force, so that the second pawl 443 is engaged with the second ratchet wheel 441, the manual pedal drives the first spindle 2 to rotate, the first spindle 2 drives the first planet carrier 411 to rotate due to the fixed connection of the first planet carrier 411 and the first spindle 2, the first planet carrier 411 drives the first ring gear 412 to rotate through the engagement transmission of the first planet wheels 413, the second planet carrier 421 and the first ring gear 412 form the first assembly 7, so that the second planet carrier 421 rotates synchronously, the second planet carrier 421 drives the second ring gear 422 to rotate through the engagement transmission of the second planet wheels 423, and the second ratchet wheel 441 is disposed on the outer circumferential surface of the second ring gear 422, so that the second ring gear 422 drives the second pawl 443 and the second ring gear rack 440 to rotate synchronously, since the second pawl carrier 440 is fixedly connected to the variator output 40 and the variator output 40 is fixedly connected to the pto wheel 5, the pto wheel 5 rotates synchronously to output power. The first overrunning clutch 400 and the first automatic centrifugal shift assembly 43 now follow.

When the first main shaft 2 is fixedly connected with the second planet carrier 421, the transmission path is as follows: during the low-speed gear, the manpower is stepped on and is trampled a drive first main shaft 2 and rotate, because second planet carrier 421 and first main shaft 2 fixed connection, consequently first main shaft 2 drives second planet carrier 421 and rotates, because second planet carrier 421 and first ring gear 412 form first subassembly 7, consequently first ring gear 412 synchronous revolution, first ring gear 412 drives first planet carrier 411 through the meshing transmission of first planet wheel 413 and rotates, because be equipped with first freewheel clutch 400 between first planet carrier 411 and the speed change mechanism output member 40, consequently first planet carrier 411 drives speed change mechanism output member 40 through first freewheel clutch 400 and rotates, because speed change mechanism output member 40 again with power take off wheel 5 fixed connection, therefore power take off wheel 5 synchronous revolution, output power. In the middle gear, when the speed of the transmission mechanism output member 40 reaches a certain value, the first centrifugal link member 432 of the first automatic centrifugal shift assembly 43 releases the first pawl member 433 under the action of centrifugal force, so that the first pawl member 433 is engaged with the first ratchet wheel 431, the first main shaft 2 is driven to rotate by the manual pedaling member, the first main shaft 2 drives the second pawl member 421 to rotate because the second planetary carrier 421 is fixedly connected with the first main shaft 2, the first assembly 7 is formed by the second planetary carrier 421 and the first gear ring 412, the first ratchet wheel 431 is arranged on the outer circumferential surface of the first assembly 7, so that the first assembly 7 drives the first pawl member 433 and the first pawl member frame 430 to rotate synchronously, the transmission mechanism output member 40 is fixedly connected with the transmission mechanism output member 40, and the power output wheel 5 is fixedly connected with the transmission mechanism output member 40, so that the power output wheel 5 rotates synchronously, this process is a constant speed output power, with the first overrunning clutch 400 following. In high gear, when the speed of the transmission mechanism output element 40 reaches a higher value, the second centrifugal link 442 of the second automatic centrifugal shift assembly 44 releases the second pawl 443 under the action of centrifugal force, so that the second pawl 443 is meshed with the second ratchet wheel 441, the manual pedal drives the first spindle 2 to rotate, the first spindle 2 drives the second planet carrier 421 to rotate because the second planet carrier 421 is fixedly connected with the first spindle 2, the second planet carrier 421 drives the second ring gear 422 to rotate through meshing transmission of the second planet gear 423, the second ratchet wheel 441 is arranged on the outer circumferential surface of the second ring gear 422, so that the second ring gear 422 drives the second pawl 443 and the second pawl carrier 440 to rotate, the transmission mechanism output element 40 is fixedly connected with the transmission mechanism output element 40, and the transmission mechanism output element 40 is fixedly connected with the power output wheel 5, so that the power output wheel 5 rotates synchronously, and outputting power. This process is accelerating output power, the first overrunning clutch 400 and the first automatic centrifugal shift assembly 43 follow.

In addition, the structure of the middle shaft is correspondingly improved in order to adapt to the arrangement of the motor power-assisted structure on the middle shaft, the transmission mechanism can realize multi-gear speed change, the riding treading frequency is in a normal range, and therefore low-speed starting and high-speed riding can be realized.

Example 2

Referring to fig. 6 to 10, a power transmission mechanism of a middle shaft multi-gear speed change motor comprises: the automatic centrifugal speed change mechanism comprises a shell 1, a first main shaft 2, a second main shaft 3, an automatic centrifugal speed change mechanism 4, a power output wheel 5, a machine core assembly 6 and a treading piece, wherein the first main shaft 2 is arranged on the shell 1 and can rotate relative to the shell 1, and the first main shaft 2 is connected with the shell 1 through a bearing. The second main shaft 3 is arranged on the shell 1 and is parallel to the first main shaft 2, the automatic centrifugal speed change mechanism 4 is sleeved on the first main shaft 2, the treading pieces are arranged at two ends of the first main shaft 2, and the core assembly 6 is sleeved on the second main shaft 3. The first main shaft 2 protrudes out of the housing 1, and in the present embodiment, the power output wheel 5 is a chain wheel.

The automatic centrifugal speed change mechanism 4 includes a speed change mechanism output member 40, three sets of planetary transmissions (i.e., a first planetary transmission 41, a second planetary transmission 42, and a third planetary transmission 43), and three sets of automatic centrifugal shift assemblies (i.e., a first automatic centrifugal shift assembly 44, a second automatic centrifugal shift assembly 45, and a third automatic centrifugal shift assembly 46), the speed change mechanism output member 40 protrudes out of the housing 1, and the power output wheel 5 is disposed on a portion of the speed change mechanism output member 40 protruding out of the housing 1. The first automatic centrifugal shifting assembly 44 is disposed between the first planetary transmission 41 and the transmission output member 40, the second automatic centrifugal shifting assembly 45 is disposed between the second planetary transmission 42 and the transmission output member 40, the third automatic centrifugal shifting assembly 46 is disposed between the third planetary transmission 43 and the transmission output member 40, the power take-off wheel 5 is fixedly connected with the transmission output member 40, and several planetary transmissions are arranged in sequence from a low speed stage to a high speed stage, in this embodiment, the first planetary transmission 41 is a lowest speed stage planetary transmission, the second planetary transmission 42 is a medium speed stage planetary transmission, the third planetary transmission 43 is a highest speed stage planetary transmission, the first planetary transmission 41 is disposed on the left side, and the second planetary transmission 42 is disposed in the middle, the third planetary transmission 43 is disposed on the right, the first planetary transmission 41 includes a first sun gear 410, a first carrier 411, a first ring gear 412, and first planetary gears 413, the second planetary transmission 42 includes a second sun gear 420, a second planet carrier 421, a second ring gear 422, and second planet gears 423, the third planetary transmission 43 includes a third sun gear 430, a third carrier 431, a third ring gear 432, and a third planet gear 433, the first center wheel 410, the second center wheel 420 and the third center wheel 430 form a first assembly 7, the first assembly 7 is fixedly connected with the housing 1, the first ring gear 412 and the second planet carrier 421 form a second assembly 8, the second ring gear 422 and the third planet carrier 431 form a third assembly 9, the third ring gear 432 is fixedly connected with the first main shaft 2, a first overrunning clutch 400 is arranged between the first planet carrier 411 and the output member 40 of the speed change mechanism.

The first automatic centrifugal shifting assembly 44 comprises a first pawl frame 440, a first ratchet wheel 441, at least two first centrifugal linkages 442, at least one first pawl member 443, at least one first balance member 444, a first elastic member 445 for controlling an initial position of the first pawl member 443, and a second elastic member 446 for controlling the first centrifugal linkage 442, the first centrifugal linkage 442 and the first pawl member 443 being rotatably mounted on the first pawl frame 440 by a first pin 447, the first elastic member 445 being mounted on the first pin 447, the second elastic member being mounted on the first pawl frame 440 by a second pin 448, the first balance member 444 being connected between two adjacent first centrifugal linkages 442, the first centrifugal linkage 442 being provided with a first weight portion 4420, the first pawl member 443 being provided with a first pawl portion 4430 engaged with the first ratchet wheel 441, when the first weight portion 4420 rotates to approach the first ratchet wheel 441, the first pawl portion 4430 rotates to separate from the first ratchet wheel 441 and to disengage from the first ratchet wheel 441, and when the first weight portion 4420 rotates to separate from the first ratchet wheel 441, the first pawl portion 4430 rotates to approach the first ratchet wheel 441 and to engage with the first ratchet wheel 441. The first pawl frame 440 is fixedly connected to or integrally formed with the gearshift mechanism output 40, the first ratchet wheel 441 is disposed on the second assembly 8, and the second automatic centrifugal shift assembly 45 has the same structure as the first automatic centrifugal shift assembly 44, and includes: a second pawl frame 450, a second ratchet 451, at least two second eccentric linkages 452, at least two second pawls 453, at least one second balance 454, a third elastic member 455 for controlling the initial position of the second pawl 453, and a fourth elastic member 456 for controlling the second eccentric linkage 452, wherein the second pawl frame 450 is fixedly connected with or integrally formed with the gearshift mechanism output 40, and the second ratchet 451 is disposed on the third assembly 9. The third automatic centrifugal shift assembly 46 is of the same construction as the first automatic centrifugal shift assembly 44 and includes: the third pawl holder 460 is fixedly connected with or integrally formed with the gearshift mechanism output 40, and the third ratchet wheel 461 is disposed on the outer circumferential surface of the third ring gear 432.

The core assembly 6 comprises a motor assembly 60 and a speed reduction assembly 61, the motor assembly 60 comprises a motor stator 600 and a motor rotor 601, the motor stator 600 is fixedly connected with the housing 1, the motor rotor 601 is sleeved on the second spindle 3 and can rotate relative to the second spindle 3, the speed reduction assembly 61 comprises a speed reduction center wheel 610, a speed reduction planet carrier 611, a speed reduction gear ring 612 and a speed reduction planet gear 613, the speed reduction center wheel 610 is fixedly connected with the motor rotor 601, the speed reduction gear ring 612 is fixedly connected with the housing 1, the speed reduction planet carrier 611 is an output part of the core assembly, the speed reduction planet carrier 611 is in transmission connection with the speed change mechanism output part 40, the first spindle 2 is provided with a first transmission wheel 20, the second spindle 3 is provided with a second transmission wheel 30, and the first transmission wheel 20 and the second transmission wheel 30 are in transmission through a transmission piece 21, in this embodiment, the second transmission wheel 30 is fixedly connected to the output member of the movement assembly (i.e. the reduction carrier 611), and a second overrunning clutch is disposed between the output member 40 of the speed change mechanism and the first transmission wheel 20. In other embodiments, the second overrunning clutch is disposed between the second transmission wheel 30 and the reduction carrier 611, and the output member 40 of the speed change mechanism is fixedly connected to the first transmission wheel 20, which can also be implemented in the present invention, in this embodiment, the first transmission wheel 20 and the second transmission wheel 30 are both belt wheels, and the transmission member 21 is a transmission belt, but in other embodiments, the first transmission wheel 20 and the second transmission wheel 30 can also be chain wheels, and the transmission member 21 is a chain, or the first transmission wheel 20 and the second transmission wheel 30 are both gears, and both are directly engaged with each other, and the transmission member 21 is not disposed.

The working principle of the power-assisted transmission mechanism of the middle shaft multi-gear variable-speed motor in the embodiment is as follows: in a low gear, the manual treading part drives the first spindle 2 to rotate, the third gear ring 432 is fixedly connected with the first spindle 2, so the first spindle 2 drives the third gear ring 432 to rotate, the third gear ring 432 drives the third planet carrier 431 to rotate through the meshing transmission of the third planet wheel 433, as the third planet carrier 431 and the second gear ring 422 form a third assembly 9, so the second gear ring 422 rotates, the second gear ring 422 drives the second planet carrier 421 to rotate through the meshing transmission of the second planet wheel 423, as the second planet carrier 421 and the first gear ring 412 form a second assembly 8, so the first gear ring 412 rotates, the first gear ring 412 drives the first planet carrier 411 to rotate through the meshing transmission of the first planet wheel 413, as the first overrunning clutch 400 is arranged between the first planet carrier 411 and the speed change mechanism output part 40, the power output wheel 5 is fixedly connected with the speed change mechanism output part 40, therefore, the power output wheel 5 rotates synchronously to output power, the process is three-stage speed reduction power output, when the speed of the output element 40 of the speed change mechanism reaches a certain value at a medium speed and a first gear, the first centrifugal linkage 442 of the first automatic centrifugal gear shift assembly 44 releases the first pawl element 443 under the action of centrifugal force, so that the first pawl element 443 is meshed with the first ratchet wheel 441, the manual pedal element drives the first spindle 2 to rotate, the first spindle 2 drives the third ring gear 432 to rotate because the third ring gear 432 is fixedly connected with the first spindle 2, the third ring gear 432 drives the third planet carrier 431 to rotate through meshing transmission of the third planet gears 433, the second planet carrier 431 rotates because the third planet carrier 431 and the second ring gear 422 form a third assembly 9, so the second ring gear 422 rotates, the second ring gear 422 drives the second planet carrier 421 to rotate through meshing transmission of the second planet gears 423, and the second planet carrier 421 and the first ring gear 412 form a second assembly 8, the first ratchet wheel 441 is disposed on the second assembly 8, so that the second assembly 8 drives the first pawl 443 and the first pawl frame 440 to rotate synchronously, and since the first pawl frame 440 is fixedly connected to the output member 40 of the speed change mechanism, the power take-off wheel 5 is fixedly connected to the output member 40 of the speed change mechanism, so that the power take-off wheel 5 rotates synchronously, and this process is a two-stage deceleration power take-off process, and at this time, the first overrunning clutch 400 follows up. At the middle gear, when the speed of the transmission mechanism output element 40 reaches a higher value, the second centrifugal link 452 of the second automatic centrifugal shifting assembly 45 releases the second pawl 453 under the action of centrifugal force, so that the second pawl 453 is meshed with the second ratchet wheel 451, the manual treading member drives the first spindle 2 to rotate, the first spindle 2 drives the third ring gear 432 to rotate because the third ring gear 432 is fixedly connected with the first spindle 2, the third ring gear 432 drives the third planet carrier 431 to rotate through the meshing transmission of the third planet gears 433, the third planet carrier 431 and the second ring gear 422 form the third assembly 9, the second ratchet wheel 451 is further arranged on the outer circumferential surface of the third assembly 9, so that the rotation of the third assembly 9 drives the second pawl 453 and the second pawl carrier 450 to rotate, and the second pawl carrier 450 is fixedly connected with the transmission mechanism output element 40, the pto 5 is fixedly connected to the variator output 40 such that the pto 5 rotates synchronously at a reduced speed, which is followed by the first overrunning clutch 400 and the first automated centrifugal shifting assembly 44. In a high gear, when the speed of the transmission mechanism output member 40 reaches a higher value, the third centrifugal link 462 of the third automatic centrifugal shift assembly 46 releases the third pawl 463 to enable the third pawl 463 to mesh with the third ratchet wheel 461 under the action of centrifugal force, the first spindle 2 is driven to rotate by the manual pedal, the third spindle 2 drives the third ring gear 432 to rotate due to the fact that the third ring gear 432 is fixedly connected with the first spindle 2, and the third ring gear 432 drives the third pawl 463 and the third pawl holder 460 to rotate due to the fact that the third ratchet wheel 461 is arranged on the outer circumferential surface of the third ring gear 432, and the third pawl holder 460 is driven to rotate by the rotation of the third ring gear 432, and the first overrunning clutch 400, the second overrunning clutch 400, the third pawl holder 460, and the power take-off wheel 5 are fixedly connected with the transmission mechanism output member 40, so that the power take-off wheel 5 synchronously rotates during the same speed power take-off process, and the first overrunning clutch 400 is used for outputting power at the same speed, The first automatic centrifugal shift assembly 44 and the second automatic centrifugal shift assembly 45 follow.

The foregoing embodiments are illustrative only of the principles and utilities of the present invention, as well as some embodiments, and are not intended to limit the invention; it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications belong to the protection scope of the present invention.

Claims (9)

1. The utility model provides a axis multi-gear variable speed motor helping hand drive mechanism which characterized in that includes: the automatic centrifugal speed change mechanism comprises a speed change mechanism output part, at least two sets of planetary transmissions and at least two sets of automatic centrifugal gear shift assemblies, each set of automatic centrifugal gear shift assembly is correspondingly arranged between each set of planetary transmission and the speed change mechanism output part, the power output wheel is fixedly connected with the speed change mechanism output part, and a plurality of sets of planetary transmissions are sequentially arranged from a low-speed stage to a high-speed stage on the structural arrangement, every set of planetary transmission all includes sun gear, planet carrier, ring gear and planet wheel, and in every two sets of adjacent planetary transmission, one of them set of planetary transmission's ring gear and another set of planetary transmission's planet carrier form first subassembly, and several sets of planetary transmission's sun gear form second subassembly, second subassembly and casing fixed connection, one of them and first main shaft fixed connection in the planet carrier of lowest speed level planetary transmission, highest speed level planetary transmission's ring gear and highest speed level planetary transmission's the planet carrier three, be equipped with first freewheel clutch between lowest speed level planetary transmission's planet carrier and the speed change mechanism output, the core subassembly is equipped with core subassembly output, the transmission is connected between core subassembly output and the speed change mechanism output.

2. The power-assisted transmission mechanism of the middle shaft multi-gear variable-speed motor as claimed in claim 1, characterized in that: each set of automatic centrifugal gear-shifting assembly comprises a pawl frame, a ratchet wheel, at least two centrifugal linkage members, at least one pawl member, at least one balance member, a first elastic member for controlling the initial position of the pawl member and a second elastic member for controlling the centrifugal linkage members, wherein the pawl frame is fixedly connected with the output member of the speed change mechanism or integrally formed, the ratchet wheel is arranged on the first assembly member or a gear ring of the highest-speed planetary transmission, the centrifugal linkage members and the pawl members are rotatably arranged on the pawl frame through first pins, the first elastic member is arranged on the first pins, the second elastic member is arranged on the pawl frame through second pins, the balance members are connected between two adjacent centrifugal linkage members, each centrifugal linkage member is provided with a counterweight part, each pawl member is provided with a pawl part meshed with the ratchet wheel, when the counterweight parts rotate to be close to the ratchet wheel, the pawl part rotates to be away from the ratchet wheel and is disengaged from the ratchet wheel, and when the counterweight part rotates to be away from the ratchet wheel, the pawl part rotates to be close to the ratchet wheel and is engaged with the ratchet wheel.

3. The power-assisted transmission mechanism of the middle shaft multi-gear variable-speed motor as claimed in claim 1, characterized in that: the core sub-assembly includes motor sub-assembly and speed reduction sub-assembly, the motor sub-assembly includes motor stator and electric motor rotor, motor stator with casing fixed connection, the electric motor rotor cover is located on the second main shaft and can rotates for the second main shaft, the speed reduction sub-assembly includes speed reduction centre wheel, speed reduction planet carrier, speed reduction ring gear and speed reduction planet wheel, speed reduction centre wheel and motor rotor fixed connection, speed reduction ring gear with casing fixed connection, speed reduction planet carrier do core sub-assembly output.

4. The power transmission mechanism of the middle shaft multi-gear variable speed motor as claimed in claim 1, wherein: the first main shaft is provided with a first gear, the second main shaft is provided with a second gear, the first gear is meshed with the second gear, a second overrunning clutch is arranged between the second gear and the output part of the core assembly, the output part of the speed change mechanism is fixedly connected with the first gear, or the second gear is fixedly connected with the output part of the core assembly, and the second overrunning clutch is arranged between the output part of the speed change mechanism and the first gear.

5. The power transmission mechanism of the middle shaft multi-gear variable speed motor as claimed in claim 1, wherein: the automatic transmission mechanism is characterized in that a first transmission wheel is arranged on the first main shaft, a second transmission wheel is arranged on the second main shaft, the first transmission wheel and the second transmission wheel are transmitted through a transmission part, a second overrunning clutch is arranged between the second transmission wheel and an output part of the core assembly, the output part of the speed change mechanism is fixedly connected with the first transmission wheel, or the second transmission wheel is fixedly connected with the output part of the core assembly, and the second overrunning clutch is arranged between the output part of the speed change mechanism and the first transmission wheel.

6. The power assisted transmission mechanism of a middle shaft multi-gear speed changing motor as claimed in claim 5, characterized in that: the transmission part is a transmission belt or a chain, and the transmission wheel is a belt wheel or a chain wheel.

7. The power transmission mechanism of the middle shaft multi-gear variable speed motor as claimed in claim 1, wherein: the output member of the speed change mechanism protrudes out of the shell, and the power output wheel is arranged on the part of the speed change mechanism protruding out of the shell.

8. The power transmission mechanism of the middle shaft multi-gear variable speed motor as claimed in claim 1, wherein: the power output wheel is a chain wheel.

9. The power transmission mechanism of the middle shaft multi-gear variable speed motor as claimed in claim 1, wherein: the first main shaft is connected with the shell through a bearing.

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