CN210063280U

CN210063280U - Coaxial middle motor of moped and moped

Info

Publication number: CN210063280U
Application number: CN201920957403.3U
Authority: CN
Inventors: 陈智清
Original assignee: Shenzhen Orcan Intelligent Technology Co Ltd
Current assignee: Shenzhen Orcan Intelligent Technology Co Ltd
Priority date: 2019-06-24
Filing date: 2019-06-24
Publication date: 2020-02-14
Anticipated expiration: 2029-06-24

Abstract

The utility model provides a motor and moped are put to moped is coaxial relates to moped technical field. The coaxial middle motor of the moped comprises a shell, and a middle shaft core, an output structure, a power-assisted motor, a sun gear, a duplex planetary gear, an inner gear ring and a planet carrier which are arranged in the shell. The sun gear is connected with the power-assisted motor. The duplex planetary gear comprises a first planetary gear and a second planetary gear which are coaxial and fixed, and both are rotationally connected with the planet carrier. The first planetary gear is meshed with the sun gear, and the second planetary gear is meshed with the inner gear ring. The inner gear ring is fixed on the shell. The planet carrier can drive the output structure. The middle shaft core can drive the output structure. The power-assisted motor shaft core, the middle shaft core, the sun gear, the planet carrier, the inner gear ring and the output structure are coaxially arranged. The utility model also provides a moped, it has adopted the coaxial motor of putting of moped. The utility model provides a motor and moped can reduce the volume and increase power take off performance in the coaxial middle of vehicle using motor of helping hand.

Description

Coaxial middle motor of moped and moped

Technical Field

The utility model relates to a moped technical field particularly, relates to a motor and moped are put to moped is coaxial.

Background

An electric power-assisted bicycle, also known as an intelligent electric bicycle, is a riding tool between a bicycle and an electric bicycle. The electric power-assisted bicycle controls the power-assisted motor to output power in proportion according to the pedaling force of a rider to assist riding, and is a product of a living mode in which people pursue high efficiency, convenience, health and environmental protection.

In the prior art, a Power Assist System (PAS) has been disclosed, in which a power assist motor is divided into three types according to a position of the power assist motor mounted on a bicycle: the front-mounted hub motor (the booster motor is mounted on the front wheel of the bicycle), the middle-mounted motor (the booster motor is mounted on the middle shaft of the crank of the bicycle), and the rear-mounted hub motor (the booster motor is mounted on the rear wheel of the bicycle).

In the prior art, the technology of the middle-mounted motor is more and more mature, and the technology of the middle-mounted motor is difficult to develop obviously, so that the size, the output power and the integration degree of the middle-mounted motor are difficult to further develop.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a put motor in the vehicle using motor is coaxial, its volume that can further reduce the coaxial motor of putting of vehicle using motor, increase its power take off performance and promote the integration degree.

The utility model discloses an aim at still including providing a moped, its volume that can further reduce moped, increase its power take off performance and promote integration degree.

The embodiment of the utility model discloses a can realize like this:

the embodiment of the utility model provides a motor is put in to vehicle using motor is coaxial, the coaxial motor of putting of vehicle using motor include the casing and set up in inside axis axle core, output structure, helping hand motor and the planetary gear transmission structure of casing.

The power-assisted motor is fixedly connected to the shell.

The planetary gear transmission structure comprises a sun gear, a duplex planetary gear, an inner gear ring and a planet carrier.

The sun gear is connected with the power-assisted motor.

The duplex planetary gear comprises a first planetary gear and a second planetary gear which are coaxially arranged and fixedly connected with each other, the first planetary gear is meshed with the sun gear, the second planetary gear is meshed with the inner gear ring, and the first planetary gear and the second planetary gear are both rotationally connected to the planet carrier.

The inner gear ring is fixedly connected to the shell.

The planet carrier is sleeved on the output structure, is rotatably connected to the shell, and can drive the output structure to rotate along a first direction.

The output structure is sleeved on the middle shaft core, the middle shaft core is rotatably connected to the shell, and the middle shaft core can drive the output structure to rotate along the first direction.

The shaft core of the power-assisted motor, the middle shaft core, the sun gear, the planet carrier, the inner gear ring and the output structure are coaxially arranged.

Optionally, the radius of the first planet gear is greater than the radius of the second planet gear.

Optionally, the duplex planetary gear further comprises a gear shaft, and the first planetary gear and the second planetary gear are rotatably connected to the planet carrier through the gear shaft.

Optionally, the sun gear, the first planet gears and the second planet gears are all straight or helical teeth.

Optionally, the coaxial centrally-mounted motor of the moped further comprises a first one-way backstop and a second one-way backstop.

First one-way backstop cover is located the output structure, the planet carrier cover is located first one-way backstop, the planet carrier can be followed first direction rotates and passes through first one-way backstop drives the output structure is followed first direction rotates.

The output structure is sleeved on the second one-way backstop, the second one-way backstop is sleeved on the middle shaft core, and the middle shaft core can rotate along the first direction and drives the output structure to rotate along the first direction through the second one-way backstop.

Optionally, the first one-way backstop is an overrunning clutch or a ratchet-pawl mechanism.

The second one-way backstop is an overrunning clutch or a ratchet and pawl mechanism.

Optionally, the coaxial centrally-mounted motor of the moped further comprises a torque detection device and a tread frequency detection device.

The moment detection device is connected to the middle shaft core and used for detecting the moment acting on the middle shaft core.

The treading frequency detection device is connected to the middle shaft core and used for detecting the rotating direction and the treading frequency of the middle shaft core.

Optionally, the torque detection device includes a torque sleeve and a torque sensor, the torque sleeve is sleeved on the center shaft core, the planet carrier is sleeved on the torque sleeve, and the center shaft core can drive the planet carrier along the first direction through the torque sleeve.

The moment sensor and the treading frequency detection device are coaxially sleeved on the center shaft core.

Optionally, the middle shaft core adopts a square hole middle shaft or a spline middle shaft.

A moped comprises a coaxial middle motor of the moped. The coaxial middle motor of the moped comprises a shell, and a middle shaft core, an output structure, a power-assisted motor and a planetary gear transmission structure which are arranged in the shell. The power-assisted motor is fixedly connected to the shell. The planetary gear transmission structure comprises a sun gear, a duplex planetary gear, an inner gear ring and a planet carrier. The sun gear is connected with the power-assisted motor. The duplex planetary gear comprises a first planetary gear and a second planetary gear which are coaxially arranged and fixedly connected with each other, the first planetary gear is meshed with the sun gear, the second planetary gear is meshed with the inner gear ring, and the first planetary gear and the second planetary gear are both rotationally connected to the planet carrier. The inner gear ring is fixedly connected to the shell. The planet carrier is sleeved on the output structure, is rotatably connected to the shell, and can drive the output structure to rotate along a first direction. The output structure is sleeved on the middle shaft core, the middle shaft core is rotatably connected to the shell, and the middle shaft core can drive the output structure to rotate along the first direction. The shaft core of the power-assisted motor, the middle shaft core, the sun gear, the planet carrier, the inner gear ring and the output structure are coaxially arranged.

The utility model provides a coaxial middle motor of vehicle using motor is for prior art's beneficial effect:

the utility model provides a coaxial middle motor of vehicle using motor can be through the sun gear of coaxial setting, axis axle core, the planet carrier, ring gear and output structure, make can set up more compact with each part of the coaxial middle motor of vehicle using motor, and then can reduce the axial dimensions of axis axle core, can be convenient for set up in suitable value trampling the width value, and then can will use the lateral distance between the two feet on the moped of the coaxial middle motor of vehicle using motor to reduce, be favorable to the user to exert force, reduce the windward area simultaneously, can reduce the windage. Meanwhile, a larger reduction ratio can be conveniently set through the arrangement of the duplex planetary gear, and the problem that the output torque of the whole machine, the power density of the motor and the efficiency of the motor are lower due to the fact that a single-stage planetary gear reduction mechanism needs to select a lower rotating speed under the condition of a certain rated output rotating speed of the middle motor because the reduction ratio is small is further solved.

The utility model provides a moped is the same for prior art's beneficial effect with the coaxial motor of putting of above-mentioned moped that provides for prior art's beneficial effect, no longer gives unnecessary details here.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of a power-assisted bicycle provided in an embodiment of the present invention;

fig. 2 is a transmission schematic diagram of a coaxial middle motor of a moped provided in the embodiment of the present invention;

fig. 3 is an exploded schematic view of a coaxial mid-motor of a power-assisted vehicle provided in an embodiment of the present invention;

fig. 4 is an exploded view of an assist motor according to an embodiment of the present invention;

fig. 5 is a sectional view of a coaxial middle motor of a moped provided in an embodiment of the present invention.

Icon: 1-a power-assisted bicycle; 10-a motor is coaxially arranged in the moped; 11-a frame; 12-a wheel; 13-pedaling; 14-chain wheel; 100-a housing; 200-a power-assisted motor; 210-flywheel disc; 300-planetary gear drive configuration; 310-sun gear; 320-double planetary gear; 321-a first planet gear; 322-a second planet gear; 323-gear shaft; 330-ring gear; 340-a planet carrier; 400-output structure; 500-middle axis core; 610-a first one-way backstop; 620-second one-way backstop.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be interpreted as a limitation of the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

Referring to fig. 1, the present embodiment provides a power assisted bicycle 1, which can provide power assistance to a user when the user rides the bicycle, so as to reduce the force applied by the user to ride the bicycle, and further save labor for the user to ride the bicycle. In addition, the power-assisted bicycle 1 provided in the embodiment can further reduce the size of the power-assisted bicycle 1, and simultaneously can increase the power output performance and improve the integration degree.

The moped 1 comprises a frame 11, wheels 12, pedals 13 and a coaxial middle motor 10 of the moped. The arrangement of the frame 11 and the wheel 12 is prior art and will not be described in detail herein. In addition, the coaxial middle motor 10 of the moped is arranged on the frame 11, and can provide assistance for the moped 1 when the moped 1 is ridden, thereby saving the riding force of a rider. The coaxial middle motor 10 of the moped can be connected to the wheel 12 through the chain disc 14, the chain and other transmission connecting pieces, so that the boosting effect is transmitted to the wheel 12, and the boosting effect is further provided. The pedals 13 are arranged on the coaxial middle motor 10 of the moped, so that a rider can apply a treading force to drive the moped 1 to move.

It should be noted that, when the assisted bicycle 1 is ridden, the rider can provide a pedaling force through the pedals 13 to drive the assisted bicycle 1, and at the same time, the assisted bicycle 1 can be assisted by providing an assistance force through the coaxially disposed motor 10 of the assisted bicycle to drive the assisted bicycle 1.

Referring to fig. 2 and fig. 3, the coaxial middle motor 10 of the moped includes a housing 100, and a middle shaft core 500, an output structure 400, a power motor 200, and a planetary gear transmission structure 300 disposed inside the housing 100. Wherein, the housing 100 is used for being fixedly connected to the frame 11, so as to ensure the stability of the coaxial middle motor 10 of the whole moped. The assist motor 200 is fixedly coupled to the housing 100 so that the assist motor 200 stably provides an assist function.

The bottom bracket axle core 500 is connected to the pedals 13, so that when a user steps on the pedals 13, the pedals 13 directly act on the bottom bracket axle core 500, and the bottom bracket axle core 500 transmits the rotational power to the wheels 12 to drive the wheels 12. It should be noted that the output structure 400 is used to connect to the chain wheel 14, i.e., the power can be output to the chain wheel 14 through the output structure 400, and transmitted to the wheel 12 through the chain wheel 14. The output structure 400 is sleeved on the center shaft core 500, so that the power can be transmitted to the chain wheel 14 through the output structure 400 and then to the wheel 12 through the center shaft core 500. In addition, the power assisting motor 200 is connected to the output structure 400 through the planetary gear transmission structure 300, that is, the power assisting motor 200 can transmit power to the output structure 400 through the planetary gear transmission structure 300 and further transmit the power to the wheel 12 to assist riding.

When the coaxial middle motor 10 of the moped is installed on the frame 11 and the pedals 13 are installed on the middle shaft core 500, a rider can provide power rotating along a first direction by pedaling the pedals 13, so as to drive the output structure 400 to rotate along the first direction, and the moped 1 can be driven. In addition, the power-assisted motor 200 can rotate along the first direction, the planetary gear transmission structure 300 can drive the output structure 400 to rotate along the first direction, the power-assisted force of the output structure 400 rotating along the first direction can be provided, and the power-assisted riding can be further provided.

It should be noted that, when the central shaft core 500 rotates in the first direction and/or the power motor 200 rotates in the first direction and drives the output structure 400, the power bicycle 1 is in a forward state.

Further, referring to fig. 2, fig. 3 and fig. 5, in the present embodiment, the coaxial middle motor 10 of the moped further includes a first one-way check device 610 and a second one-way check device 620. The first one-way check device 610 is disposed between the planetary gear transmission structure 300 and the output structure 400, and when the power motor 200 rotates along a first direction, the output structure 400 can be driven to rotate along the first direction by the first one-way check device 610. In addition, when the central shaft core 500 drives the output structure 400 to rotate and the assisting motor 200 does not provide assisting power to the output structure 400 at the same time, the assisting motor 200 rotates in a second direction relative to the first one-way backstop 610, wherein the second direction is opposite to the first direction. At this time, the output structure 400 can rotate relative to the first one-way check 610, that is, when the rotation direction of the assisting motor 200 relative to the first one-way check 610 is the second direction, the assisting motor 200 does not transmit power to the output structure 400 at this time. That is, the assist motor 200 provides the assist force to the output structure 400 through the first one-way check 610 when rotating in the first direction with respect to the first one-way check 610, and the assist motor 200 and the first one-way check 610 rotate relatively, that is, the power is not transmitted to the output structure 400, when the assist motor 200 rotates in the second direction with respect to the first one-way check 610.

In addition, the second one-way check device 620 is disposed between the middle shaft core 500 and the output structure 400, and when the middle shaft core 500 rotates along the first direction, the output structure 400 can be driven to rotate along the first direction through the second one-way check device 620. In addition, when the rider stops pedaling or pedals 13 in the second direction, the bottom bracket axle core 500 rotates in the second direction relative to the second one-way check device 620, that is, the bottom bracket axle core 500 does not transmit power to the output structure 400. That is, when the middle shaft core 500 rotates in the first direction relative to the second one-way check device 620, power is transmitted to the output structure 400 through the second one-way check device 620; when the middle shaft core 500 rotates in the second direction relative to the second one-way check device 620, the middle shaft core 500 and the second one-way check device 620 rotate relative to each other, i.e., power is not transmitted to the output structure 400.

Through the setting of first one-way backstop 610 and one-way backstop 620 of second, eliminated and caused the phenomenon of magnetic resistance or mechanical resistance to the central spindle core 500 when helping hand motor 200 shut down, and then guaranteed not to cause extra burden to the passerby of riding when making helping hand motor 200 not carrying out the helping hand.

Further, the first one-way check 610 is an overrunning clutch or a ratchet-pawl mechanism. The second one-way backstop 620 is an overrunning clutch or a ratchet-pawl mechanism. The specific structure of the overrunning clutch and the ratchet-pawl structure is the prior art, and is not described herein.

In addition, in the present embodiment, the planetary gear transmission structure 300 includes a sun gear 310, a double planetary gear 320, an inner gear 330, and a carrier 340. The sun gear 310 is connected to the power motor 200, and specifically, the power motor 200 has an output shaft, and the sun gear 310 is connected to the output shaft, so that the power motor 200 can drive the sun gear 310 to rotate through the output shaft. The double planetary gears 320 are engaged with the sun gear 310, and the double planetary gears 320 are engaged with the ring gear 330 and the carrier 340. The ring gear 330 is fixedly connected to the housing 100, and the planet carrier 340 is sleeved on the output structure 400, so that the kinetic energy assisting power can be transmitted to the output structure 400 through the planet carrier 340. When the power assisting motor 200 operates, the duplex planetary gear 320 and the planet carrier 340 can be sequentially driven by the sun gear 310, and the output structure 400 is driven by the planet carrier 340 to rotate along the first direction.

Further, in the present embodiment, the shaft core of the assist motor 200, the sun gear 310, the ring gear 330, the planet carrier 340, the middle shaft core 500, and the output structure 400 are coaxially disposed. Through the sun gear 310, the ring gear 330, the planet carrier 340, the axis axle core 500 and the output structure 400 that set up coaxially, can make can set up each part of the coaxial mid motor 10 of vehicle using motor more compactly, and then can reduce the axial dimensions of axis axle core 500, can be convenient for set up trample width value in suitable value, and then can reduce the lateral distance between the both feet on the moped 1 that uses this coaxial mid motor 10 of vehicle using motor 10, be favorable to the user to exert oneself, reduce the area of facing the wind simultaneously, can reduce the windage.

The double planetary gear 320 includes a first planetary gear 321 and a second planetary gear 322, and the first planetary gear 321 and the second planetary gear 322 are fixedly connected and coaxially disposed. Wherein the first planetary gears 321 are engaged with the sun gear 310, the second planetary gears 322 are engaged with the ring gear 330, and the first planetary gears 321 and the second planetary gears 322 are both rotatably connected to the carrier 340. When the power-assisted motor 200 rotates, the sun gear 310 rotates along with the power-assisted motor 200, meanwhile, the sun gear 310 drives the first planetary gears 321 to rotate, and when the first planetary gears 321 rotate, the second planetary gears 322 rotate synchronously with the first planetary gears 321, so that the second planetary gears 322 can move along the inner gear ring 330 when rotating, and simultaneously drive the planet carrier 340 to rotate, and the planet carrier 340 can drive the output shaft to rotate along the first direction. In this embodiment, the radius of the first planetary gear 321 is greater than the radius of the second planetary gear 322, so that the reduction ratio of the planetary gear transmission structure 300 formed by the sun gear 310, the first planetary gear 321, the second planetary gear 322, the ring gear 330 and the planet carrier 340 is increased, and thus the power-assisted motor 200 can adopt a high-speed driving motor, which is beneficial to increasing the transmission ratio, increasing the output torque, increasing the power density and efficiency of the power-assisted motor 200, and saving the battery power of the power-assisted bicycle.

In addition, the duplex planetary gear 320 further includes a gear shaft 323, and the first planetary gear 321 and the second planetary gear 322 are rotatably connected to the carrier 340 through the gear shaft 323. That is, the gear shaft 323 is fixedly connected to the carrier 340, and the first and second

planetary gears

321 and 322 are both rotatably connected to the gear shaft 323; alternatively, the gear shaft 323 is rotatably connected to the carrier 340, and the first and second

planetary gears

321 and 322 are both rotatably connected to the gear shaft 323.

Further, in the present embodiment, the sun gear 310, the first planetary gears 321, and the second planetary gears 322 are all provided by spur gears. Correspondingly, the inner gear ring 330 and the planet carrier 340 are also provided with straight teeth. It should be understood that in other embodiments, the sun gear 310, the first planet gears 321 and the second planet gears 322 are arranged in helical gears, and correspondingly, the inner gear 330 and the planet carrier 340 are also arranged in helical gears. The duplex planetary gear 320 structure can bear larger load through the arrangement of the helical teeth, the overload capacity of the duplex planetary gear 320 structure can be improved, noise is reduced, and the movement is more stable.

The coaxial middle motor 10 of the moped further comprises a torque detection device and a tread frequency detection device. The moment detecting device is connected to the bottom bracket axle core 500 and is used for detecting the moment acting on the bottom bracket axle core 500. When the center shaft core 500 is subjected to the acting force of the pedals 13, the moment applied to the center shaft core 500 can be detected by the moment detection device. The pedaling frequency detecting device is also connected to the bottom bracket axle core 500 and is used for detecting the rotation direction and the pedaling frequency of the bottom bracket axle core 500.

Further, in this embodiment, the coaxial centrally-mounted motor 10 of the moped further includes a controller, and the controller is electrically connected to the torque detection device and the tread frequency detection device. The torque detection device and the pedaling frequency detection device can send the detected torque data, the rotation direction data of the middle shaft core 500 and the pedaling frequency data to the controller. In addition, the controller is electrically connected with the power-assisted motor 200, and the controller can control the power-assisted motor 200 to operate according to the received torque data, the rotation direction data of the middle shaft core 500 and the treading frequency data, so as to control the power-assisted motor 200 to provide power-assisted riding.

In this embodiment, the torque detection device includes a torque sleeve and a torque sensor, the torque sleeve is sleeved on the middle shaft core 500, the planet carrier 340 is sleeved on the torque sleeve, and the middle shaft core 500 can drive the planet carrier 340 along the first direction through the torque sleeve. The pedaling frequency detection device adopts a pedaling frequency sensor. Wherein, the moment sensor and the pedal frequency sensor are coaxially sleeved on the middle shaft core 500. When the central shaft core 500 transmits power to the planet carrier 340 through the torque sleeve, the torque and the tread frequency can be detected through the torque sensor and the tread frequency sensor.

The following describes a plurality of different riding states:

when the assist motor 200 assists the normal driving state of the drive and the human pedaling drive is stationary or the backward pedaling. At this time, the power-assisted motor 200 transmits power to the output structure 400 through the planetary gear transmission structure 300, outputs the power to the wheel 12 through the output structure 400, and drives the power-assisted bicycle 1 to move. At this time, since the rider does not step on the pedals 13 or drives the middle shaft core 500 to rotate along the second direction, at this time, the middle shaft core 500 rotates along the second direction relative to the second one-way check device 620, that is, the middle shaft core 500 does not affect the power transmission of the output structure 400. At this time, the power-assisted motor 200 drives the power-assisted bicycle 1 to move, i.e. the pure electric driving mode of the power-assisted bicycle 1 can be considered.

When the motor is in the normal driving state of auxiliary driving and in the normal driving state of manual treading. At this time, the assist motor 200 also supplies power to the output structure 400. Meanwhile, the rider provides a force to the center shaft core 500 by stepping on the pedals 13, so that the center shaft core 500 can be driven to rotate. Output structure 400 receives the manpower and tramples the dual drive of drive and helping hand motor 200 drive this moment, is the mixed drive power of the drive of trampling the drive for the manpower and helping hand motor 200 drive this moment and acts on output structure 400, and then output structure 400 is with power transmission to wheel 12 to drive moped 1.

It should be noted that in the present embodiment, the assist motor 200 has a rated rotation speed, that is, the assist motor 200 has the highest rotation speed. When the normal driving state of the motor auxiliary driving and the normal driving state of the manual treading are performed, when the treading frequency detection device detects that the rotating speed of the center shaft core 500 is greater than or equal to the rated rotating speed of the power-assisted motor 200, the controller controls the power-assisted motor 200 to stop running, and at the moment, the power-assisted bicycle 1 is switched to a pure manual driving mode. At this time, due to the arrangement of the first one-way backstop 610 and the second one-way backstop 620, the influence of the power-assisted motor 200 on the rotation of the central shaft core 500 can be avoided, and then the influence of magnetic resistance and mechanical resistance on manual driving is eliminated. When the pedaling frequency detecting device detects that the rotating speed and the speed of the central shaft core 500 are less than the rated rotating speed of the power-assisted motor 200, the power-assisted bicycle 1 is driven to move by adopting a mixed driving force mode. When the rotation speed of the middle shaft core 500 is less than the rated rotation speed of the power motor 200, due to the arrangement of the second one-way backstop 620, even if the rotation speed of the power motor 200 is greater than the rotation speed of the middle shaft core 500, the middle shaft core 500 can be prevented from influencing the output structure 400.

When the assist motor 200 assists the drive and is damaged or loses power, the assist bicycle 1 can be driven only by manpower at this time. And, can be through the setting of first one-way backstop 610 this moment for when driving axis axle core 500 through pedal 13, and drive output structure 400 through axis axle core 500 and rotate, can avoid the motor to produce magnetic resistance or mechanical resistance to output structure 400, and then guarantee that the manpower is ridden and not receive helping hand motor 200 and planetary gear transmission structure 300's influence.

When the power-assisted motor 200 is in an initial starting state and is started by pedaling by manpower forwards, the torque detection device detects an electric signal generated by pedaling by the manpower, and transmits torque data to the controller, and the controller controls the power-assisted motor 200 to start and perform power assistance to assist riding.

When the power-assisted motor 200 stops driving and is manually stepped to retreat or stop driving, namely, the middle shaft core 500 rotates or stops rotating along the second direction at the moment, and the driving motor stops driving, at the moment, due to the arrangement of the first one-way backstop 610 and the second one-way backstop 620, the influence of the middle shaft core 500 and the power-assisted motor 200 on the output structure 400 can be avoided, and the safety of free sliding or pushing of the power-assisted bicycle 1 can be ensured.

In summary, the coaxial middle motor 10 of the moped provided in this embodiment can make the arrangement of each component of the coaxial middle motor 10 of the moped more compact through the coaxially arranged sun gear 310, the middle shaft core 500, the planet carrier 340, the ring gear 330 and the output structure 400, so as to reduce the axial size of the middle shaft core 500, facilitate the setting of the tread width value at a proper value, reduce the transverse distance between the two feet of the moped 1 applying the coaxial middle motor 10 of the moped, facilitate the force generation of a user, reduce the windward area, and reduce the wind resistance. Meanwhile, a larger reduction ratio can be conveniently set through the arrangement of the duplex planetary gear 320, and the problem that the output torque of the whole machine, the power density of the motor and the efficiency of the motor are lower due to the fact that a single-stage planetary gear reduction mechanism needs to select a lower rotating speed under the condition of a certain rated output rotating speed of the middle motor because the reduction ratio is small is further solved.

In addition, in the embodiment, the power assisting motor 200 is arranged in a manner of an inner rotor and an outer stator, the central shaft core 500 is arranged through the center of the rotor and is coaxial with the rotor, and the rotor is connected to the sun gear 310 so as to transmit power to the sun gear 310. It should be appreciated that in other embodiments, such as that shown in FIG. 4, the assist motor 200 may also be designed in the form of an inner stator and an outer rotor, where the rotor is coupled to the sun gear 310 via the flywheel disk 210 to facilitate power transfer to the sun gear 310. The specific structure is the prior art and is not described herein.

In addition, the middle shaft core 500 can adopt a square hole middle shaft or a spline middle shaft.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A coaxial middle motor of a moped is characterized by comprising a shell, a middle shaft core, an output structure, a power-assisted motor and a planetary gear transmission structure, wherein the middle shaft core, the output structure, the power-assisted motor and the planetary gear transmission structure are arranged in the shell;

the power-assisted motor is fixedly connected to the shell;

the planetary gear transmission structure comprises a sun gear, a duplex planetary gear, an inner gear ring and a planet carrier;

the sun gear is connected with the power-assisted motor;

the duplex planetary gear comprises a first planetary gear and a second planetary gear which are coaxially arranged and fixedly connected with each other, the first planetary gear is meshed with the sun gear, the second planetary gear is meshed with the inner gear ring, and the first planetary gear and the second planetary gear are both rotationally connected to the planet carrier;

the inner gear ring is fixedly connected to the shell;

the planet carrier is sleeved on the output structure, is rotatably connected to the shell and can drive the output structure to rotate along a first direction;

the output structure is sleeved on the middle shaft core, the middle shaft core is rotationally connected to the shell, and the middle shaft core can drive the output structure to rotate along the first direction;

2. The coaxial middle motor of power-assisted vehicle of claim 1, wherein the radius of the first planetary gear is larger than the radius of the second planetary gear.

3. The coaxial middle motor of power-assisted vehicle of claim 1, wherein the duplex planetary gear further comprises a gear shaft, and the first planetary gear and the second planetary gear are rotatably connected to the planet carrier through the gear shaft.

4. The coaxial centrally-mounted motor for the moped as recited in any one of claims 1 to 3, wherein the sun gear, the first planetary gear and the second planetary gear are all straight teeth or helical teeth.

5. The coaxial middle motor of the moped as recited in claim 1, further comprising a first one-way check device and a second one-way check device;

the first one-way backstop is sleeved on the output structure, the planet carrier is sleeved on the first one-way backstop, and the planet carrier can rotate along the first direction and drive the output structure to rotate along the first direction through the first one-way backstop;

6. The coaxial middle motor of the moped as recited in claim 5, wherein the first one-way backstop is an overrunning clutch or a ratchet-pawl mechanism;

7. The coaxial middle motor of the moped as recited in claim 1, further comprising a torque detection device and a tread frequency detection device;

the moment detection device is connected to the middle shaft core and used for detecting the moment acting on the middle shaft core;

8. The coaxial centrally-mounted motor of the moped as claimed in claim 7, wherein the torque detection device comprises a torque sleeve and a torque sensor, the torque sleeve is sleeved on the center shaft core, the planet carrier is sleeved on the torque sleeve, and the center shaft core can drive the planet carrier along the first direction through the torque sleeve;

9. The coaxial middle motor of the moped, according to claim 1, characterized in that the center shaft core is a square hole center shaft or a splined center shaft.

10. A power-assisted bicycle, characterized by comprising the coaxial middle motor of the power-assisted bicycle as claimed in any one of claims 1 to 9.