JP7122683B2 - electric tricycle - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electric three-wheeled bicycle, and relates to brake technology for use by the elderly.

Conventionally, bicycles for the elderly are roughly divided into two types, a three-wheeled type and a four-wheeled type, and the three-wheeled type has two front wheels and one rear wheel. There is also a type with one front wheel and two rear wheels.

Comparing a three-wheeled bicycle for the elderly and a four-wheeled bicycle for the elderly, there are the following differences. In terms of riding feeling, the 3-wheeled bicycle for the elderly is closer to a normal bicycle, and in terms of running speed, the 3-wheeled bicycle for the elderly can easily achieve a high running speed. can be done. In terms of running stability, a four-wheeled bicycle for the elderly is less likely to fall over, so a four-wheeled bicycle for the elderly is suitable for elderly people with particularly poor physical abilities.

In addition, bicycles for the elderly can be divided into electric assisted bicycles and general bicycles. Of course, electric assisted bicycles require less physical effort to drive the pedals on slopes, and are easier to start. It can be said that it is friendly to the elderly in that the steering wheel is smooth and the steering wheel does not wobble.

Also, some electrically assisted bicycles perform regenerative braking. For example, in Patent Document 1, an electric motor that generates an auxiliary driving force, a coaster brake that is disposed in the hub of the rear wheel and operates when the pedal is rotated in the direction opposite to when the vehicle is traveling forward, and a control unit that causes the electric motor to perform a regenerative braking operation or a braking operation when the coaster brake is actuated.

Japanese Patent No. 4959858

The development of an electric three-wheeled bicycle, especially an electric three-wheeled bicycle for elderly people, involves the following problems.

Conventional three-wheeled vehicles, not only electric three-wheeled bicycles, have poor stability due to their structural reasons, and therefore tend to overturn when cornering at a high speed. In particular, a three-wheeled vehicle having two front wheels and one rear wheel has a structural reason that it tends to overturn.

In a three-wheeled vehicle with two front wheels and one rear wheel, if the required distance is secured between the handle and the saddle, the riding position (saddle position) where the weight of the rider acts is set on the rear wheel side. . For this reason, the center of gravity of the three-wheeled bicycle with a person on it acts away from the front wheels of the two wheels and close to the rear wheel of the first wheel. Therefore, it becomes easy to overturn in cornering.

Conversely, in a three-wheeled bicycle with one front wheel and two rear wheels, the center of gravity of the three-wheeled bicycle with a person on it is away from the front wheel of one wheel and closer to the rear wheels of the two wheels. works. Therefore, it becomes difficult to overturn in cornering.

Also, the electric three-wheeled bicycle has a motor unit provided in a hanger portion in the middle of the vehicle body, and the driving force output by the motor is transmitted to the rear wheels via a chain. For the transmission of this force, a one-wheel drive system is employed in which driving force is applied to only one of the two rear wheels. Therefore, if the rear driving wheel derails in a ditch or the like by mistake, the driving wheel spins and the electric three-wheeled bicycle cannot move.

Furthermore, since the grip strength of elderly people is weak, they cannot grip the brake lever of the steering wheel tightly, and the brake operation force is weak, so there is a problem that strong braking force cannot be exerted. In particular, when going downhill for a long time or a steep slope, it is necessary to continuously operate the brakes by squeezing the brake lever. The inability to obtain power has become a factor in causing falls and collision accidents.

Also, due to their physical strength, the elderly tend to wobble when operating the steering wheel. Especially when the basket on the front wheel side is loaded with luggage, the weight of the basket may grab the steering wheel and cause accidents such as overturning. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electric three-wheeled bicycle capable of reducing the physical load required for brake operation by assisting the braking force on downhills and the like.

In order to solve the above problems, an electric three-wheeled bicycle according to the present invention has one front wheel and two rear wheels, and comprises a front frame, a rear frame, and a hub of the front wheel . A hub motor that has a planetary gear mechanism arranged inside, and a torque sensor unit that functions as a control device that detects the torque derived from human power generated by the pedaling force and controls the motor output of the hub motor according to the detected torque derived from human power. , the front frame has a fork that supports the front wheel and a head tube that supports a handlebar, a seat tube that holds a seat post on which a saddle is arranged, and a torque sensor unit that rotatably holds the pedals. It is characterized by

In the electric three-wheeled bicycle according to the present invention, the torque sensor unit supports a crankshaft that rotatably supports the pedals, and the tip of the saddle is shifted to the rear side of the vehicle body in the longitudinal direction of the vehicle body relative to the crankshaft. Characterized by

In the electric three-wheeled bicycle according to the present invention, the hub motor operates as a regenerative brake by the rotation of the front wheels when not driven, and the control device controls the rate of increase in the number of rotations of the front wheels per unit time when the hub motor is not driven. is exceeded, the regenerative braking of the hub motor is activated.

In the electric three-wheeled bicycle according to the present invention, the rotor of the hub motor rotates as the front wheel rotates when the hub motor is not driven, and the controller measures the rotation speed of the front wheel based on the rotation speed of the rotor when the hub motor is not driven. characterized by

In the electric three-wheeled bicycle according to the present invention, the brake lever provided on the handle has a regeneration switch that turns on and off in conjunction with the operation of the brake lever, and the control device controls regeneration regardless of the number of rotations of the front wheels. It is characterized by stopping the motor output of the hub motor and activating the regenerative brake when the switch is turned on.

An electric three-wheeled bicycle according to the present invention is characterized in that a basket for carrying luggage is arranged on the rotation axis of the handle.

The electric three-wheeled bicycle according to the present invention is characterized in that the position of the center of gravity when the rider is on the bicycle is offset to the rear side of the vehicle body.

According to the electric three-wheeled bicycle according to the present invention, when the hub motor is driven, one of the front wheels pulls the vehicle body in a front-wheel drive state, thereby improving the straightness of the three-wheeled bicycle. In other words, by combining one-wheel drive, in which either one of the rear wheels is driven by human power, and front-wheel drive by a hub motor, there is no risk of skewing, and the course can be finely adjusted by operating the steering wheel to maintain the course. This reduces the need to do so, suppresses wobbling of the steering wheel when driving by the elderly or physically weak, and improves the straightness of the electric three-wheeled bicycle and the safety of driving operation.

In addition, by providing one-wheel drive of the rear wheels by human power and front-wheel drive by a hub motor, even if one of the rear wheels driven by one-wheel drive spins due to the presence of an obstacle, etc., the front wheels can be driven by the hub motor. , the electric tricycle can run without stopping.

The braking force can be assisted by the hub motor operating as a regenerative brake. As a result, it is possible to reduce the physical burden of brake operation for the elderly and others, and to ensure reliable braking force by supplementing the braking force with regenerative braking even when the braking force that relies on human power due to handbrake operation is weak. can.

When the hub motor is in a non-driving state on a downhill and the rate of increase in the number of rotations of the front wheels per unit time exceeds the set value, the hub motor operates as a regenerative brake, so braking force can be obtained even if the elderly do not operate the brakes. This reduces the running speed and improves the safety of elderly people when running.

Furthermore, for people with weak grip strength, such as the elderly, it is a heavy physical burden to keep gripping the brake lever strongly. Even when going downhill or downhill on a steep slope, the brake operation force required for braking is reduced, and the braking force is supplemented by regenerative braking to ensure sufficient braking force to prevent falls and collision accidents. can be prevented.

By providing a regenerative switch that turns ON/OFF in conjunction with the braking operation of the brake lever, the regenerative braking of the hub motor can be actuated at any time regardless of the number of revolutions of the front wheels. In addition, when the brakes are applied, the regenerative switch is turned on, the hub motor is deactivated, and there is no motor output. improves.

Since the basket for carrying the load is placed on the center of rotation of the handle that operates the front wheel driven by the hub motor, even if a heavy load is placed on the basket, the wobble of the steering wheel can be reduced. That is, inertial force in the straight direction acts on the front wheel that receives the driving force of the hub motor, and as a result, shaking of the steering wheel during traveling of the electric three-wheeled bicycle is reduced, and wobble in steering wheel operation for the elderly and the like can be reduced.

By offsetting the position of the center of gravity to the rear side of the vehicle body when the rider is on the bicycle, the center of gravity of the electric three-wheeled bicycle can be arranged to the rear of the vehicle body, which prevents the bicycle from overturning during cornering.

1 is a front view of an electric three-wheeled bicycle showing an embodiment of the present invention; Sectional view showing the hub motor in the same embodiment An enlarged view showing a handle part in the same embodiment. An enlarged view showing the frame structure in the same embodiment. Enlarged view showing the frame structure in the other same embodiment 1 is an enlarged view showing a seat tube structure according to an embodiment of the present invention; FIG. Enlarged view showing a seat tube structure in another embodiment An enlarged view showing the seat tube structure in the same embodiment. The front view of the saddle in embodiment of this invention Rear view of the same saddle Rear view of the same saddle Rear perspective view of the same saddle Enlarged view showing conventional frame structure

An embodiment of the present invention will be described with reference to the drawings.
(overall structure)
As shown in FIGS. 1 to 3, the electric tricycle 1 has a body frame 2 divided into a front frame 3 and a rear frame 4 . The front frame 3 comprises a head tube 31 , a down tube 32 , a seat tube 33 , a rear tube 36 and seat stays 37 .

A head tube 31 rotatably supports the fork 6 supporting the front wheel 5 and the handle 7 .

The front wheel 5 is provided with a hub motor 50, and the front frame 3 is provided with a front basket 12, a torque sensor unit 13 forming a control unit, and a battery 14. That is, in this embodiment, the hub motor 50, the torque sensor unit 13, and the battery 14 form a front wheel drive mechanism that depends on the motor output. The front basket 12 is provided on the rotation axis of the handle 7 at the center of the handle 7, and the center of gravity of the load acts near the rotation axis of the handle 7. - 特許庁

The rear frame 4 is provided with a pair of left and right rear wheels 21 , 21 , a rear sprocket 22 interlocked with the axle of one of the rear wheels 21 , and a rear basket 23 . A chain 24 is stretched between the front sprocket 9 and the rear sprocket 22, and the rotational force applied by the pedal 8b is transmitted to one rear wheel 21 via the chain 24. - 特許庁That is, in this embodiment, the pedals 8b, the front sprocket 9, the rear sprocket 22 and the chain 24 form a rear wheel drive mechanism that relies on human power.

Further, in the present embodiment, a swinging mechanism (not shown) is interposed between the front frame 3 and the rear frame 4, and the front frame 3 swings relative to the rear frame 4 in the swinging mechanism. It is mobile. The rocking mechanism is not necessarily required, and the front frame 3 and the rear frame 4 may be integrally fixed.

A hub motor 50 provided on the front wheel 5 has a structure shown in FIG. 2, for example. Various types of hub motors 50 can be employed, and are not limited to the present embodiment.

As shown in FIG. 2, the hub motor 50 according to this embodiment is built in a metal hub 51 arranged at the center of the front wheel 5 . The hub 51 has hub support shafts 52a and 52b on both sides fixed to the fork 12, respectively. The hub support shaft 52b fixedly supports a fixed portion 54 of the hub 51, and the fixed portion 54 rotatably supports a metal rotating portion 55 forming an outer peripheral surface of the hub 51 in the radial direction of rotation. The side rotating portion 53 rotates integrally with the rotating portion 55 . Spokes 56 of the front wheel 5 are attached to the rotating portion 55, and the rotating portion 55 and the side rotating portion 53 rotate integrally with the rim 57 of the front wheel 5, the tire 58, and the like.

The hub motor 50 has a stator 59 fixedly supported by a fixed portion 54 and a rotor 60 rotatably supported by the fixed portion 54 . A planetary gear mechanism 61 is provided between the rotor 60 and the side rotating portion 53 .

The planetary gear mechanism 61 includes a sun gear 62 formed integrally with the rotor 60, an internal gear 63 provided on the side rotating portion 53, and a planetary carrier 64 rotatably supported by the hub support shaft 52a on one side. , a plurality of planetary gears 65 which are rotatably supported by a planetary carrier 64 and mesh with an internal gear 63 and a sun gear 62 to transmit the driving force of the hub motor 50 to the hub 51 .

The hub motor 50 in the present embodiment can generate regenerative electric power to charge the battery 22 when not in operation, and can operate as a regenerative brake. Further, the torque sensor unit 13 serves as a control device that detects the torque derived from human power generated by the pedaling force applied to the pedal 8b and controls the motor output of the hub motor 50 according to the detected torque derived from human power.

As shown in FIG. 3, the handle 7 is provided with brake levers 71a and 71b below grips attached to both ends thereof.

One brake lever 71a is interlocked with a front brake device 73 via a brake wire 72a, and the front brake device 73 applies braking force to the front wheels 5 mechanically. The other brake lever 71b is interlocked with a rear brake device 74 via a brake wire 72b, and the rear brake device 74 applies braking force to the rear wheel 21 mechanically.

Further, on one side (for example, the right side) of the handle 7, a shift operating portion 16 for switching gear stages of an internal transmission 15 interlocking with the rear wheels 21 is attached. By rotating the operation grip 16a, the internal transmission 15 is interlocked and operated via the wire 17 for transmission.

An operation unit 18 is attached to the other side of the handle 7, and the operation unit 18 includes a switch button (not shown) or the like for electrically turning ON/OFF the driving force addition operation (so-called assist operation) by the hub motor 50. has multiple

Brake switches 75a and 75b for detecting the operation state of the brake levers 71a and 71b are arranged at the positions where the brake levers 71a and 71b are attached to the handle 7. As shown in FIG. These brake switches 75a and 75b constitute regenerative switches that are turned ON/OFF in conjunction with the braking operation of the brake levers 71a and 71b. It controls functions to work properly.

In the present embodiment, torque sensor unit 13 has a control function of activating regenerative braking of hub motor 50 when the rate of increase in the number of rotations of front wheels 5 per unit time exceeds a set value while hub motor 50 is not driven. is doing. The number of revolutions of the front wheels 5 can be measured by a separately provided tachometer (not shown). A sensor (not shown) provided in the hub motor 50 measures the number of revolutions of the rotor 60 when not driven, and the number of revolutions of the front wheel 5 is measured based on the number of revolutions of the rotor 60 .
(frame structure)
As shown in FIG. 4, the torque sensor unit 13 rotatably supports the crank shaft 8a of the crank portion 8 and holds the pedal 8b rotatably around the axis of the crank shaft 8a. The torque sensor unit 13 also rotatably supports the front sprocket 9 via the crankshaft 8a.

A gusset 34 is arranged between the down tube 32 and the seat tube 33 . The battery 14 is arranged above the gusset 34 and the torque sensor unit 13 is attached below. The hanger tube 35 is positioned on the vehicle front side of the gusset 34 and is connected between the gusset 34 and the down tube 32 . The seat tube 33 is arranged with the seat tube lower end 33a connected to the vehicle body rear side of the gusset 34, and the hanger tube 35 and the crankshaft 8a are positioned in front of the seat tube lower end 33a.

As shown in FIG. 6, the seat tube 33 includes a lower seat tube 33b connected to the gusset 34 and an upper seat tube 33d connected to the lower seat tube 33b via the offset portion 33c. 33d is shifted to an offset position on the vehicle rear side of the lower seat tube 33b.

The upper seat tube 33 d holds the seat post 10 so as to be retractable along the axial direction of the upper seat tube 33 d, and the saddle 11 is arranged at the upper end of the seat post 10 .

As shown in FIGS. 9 to 12, the saddle 11 has a turret 92 arranged on the underside of the hull 91 forming a structural member, and the hull 91 and the base 96 are connected to the hull 91 via coils 94 and bolts 95 covered with a cover 93 . , and a top 97 is attached to the base 96 .

The tower 92 is provided with a saddle fixing metal fitting 92a on the boat line 91 via a tower adjusting bolt 92b. The saddle 11 is fixed to the seat post 10 by tightening the saddle fixing metal fitting 92a to the seat post 10 by tightening the tower adjusting bolt 92b.

According to the electric three-wheeled bicycle according to the present embodiment described above, the seat tube 33 on which the saddle 11 is arranged and the crankshaft 8a arranged on the torque sensor unit 13 have an offset positional relationship in the longitudinal direction of the vehicle body, By shifting the saddle 11 to the rear side of the vehicle body, the front center, which is the distance between the axis of the crankshaft 8a and the rotation axis 5a of the front wheel 5, can be shortened to provide a compact electric three-wheeled bicycle. As a result, the center of gravity of the electric three-wheeled bicycle can be arranged at the rear of the vehicle body while the rider is riding the bicycle while realizing compactness.

When adjusting the saddle height from the ground to the saddle 11 by moving the saddle 11 along the axis of the seat tube 33 as shown in FIG. Inconvenience occurs when matching the saddle height to short riders. That is, when the saddle height is lowered, the pedal-saddle distance between the pedal 8b rotating about the crankshaft and the saddle 11 is shortened, which hinders the rider from pedaling the pedal 8b.

However, since the seat tube 33 on which the saddle 11 is arranged and the crankshaft 8a arranged on the torque sensor unit 13 have an offset positional relationship in the front-rear direction of the vehicle body, there is no interference between the pedals 8b and the saddle 11 from the rider's hip joint. A sufficient distance can be secured to accommodate the leg length up to the ankle.

In addition, the lower seat tube 33b shifts toward the rear side of the upper seat tube 33d via the offset portion 33c, and the saddle 11 shifts toward the rear side of the vehicle body from the axial position of the lower seat tube 33b. Even if the height is lowered, a sufficient distance can be secured between the pedal 8b and the saddle 11 to accommodate the rider's leg length from the hip joint to the ankle, and the center of gravity as an electric three-wheeled bicycle can be further improved. Can be placed backwards.
(other frame structures)
The frame structure described above can also be the structure described below.

That is, as shown in FIG. 5, the down tube 32 is connected to the vehicle body front side of the gusset 34, the rear tube 36 is connected to the vehicle body rear side of the gusset 34, and the seat tube lower end 33b is connected to the rear tube 36.

Also in this configuration, the configuration shown in FIG. 6 can be applied, and the configurations shown in FIGS. 7 and 8 can also be applied.

That is, the seat tube 33 is formed of one straight tube. A seat post 10a that supports the saddle 11 is bent horizontally toward the rear side of the vehicle body, and the saddle 11 is arranged at the end portion of the seat post 10a on the rear side of the vehicle body.

The seat post 10a holds a saddle fixing bracket 10b (reference numeral 92a in FIGS. 9 to 12) for fixing the saddle 11 so as to be movable in the axial direction of the seat post 10a. has a post groove portion 10c extending in the axial direction on the lower surface side.

The saddle fixing bracket 10b has a split structure having an opening 10d, and is fixed to the seat post 10a by tightening bolts 10e at both ends across the opening 10d. The inner surface of the saddle fixing member 10b is provided with a rotation preventing portion 10f that engages with the post groove portion 10c to prevent rotation of the seat post 10a around the axis. A retaining bolt 10g is arranged on the terminal end side of the seat post 10a.

According to this frame structure, the saddle 11 is shifted from the position on the axis 33 of the seat tube to the offset position on the rear side of the vehicle body. Further, by holding the saddle fixing metal fitting 10b for fixing the saddle 11 so as to be movable in the axial direction of the seat post 10a, the saddle height can be kept constant and the saddle position can be easily changed in the longitudinal direction of the vehicle body. It is possible to secure a sufficient distance between the pedal 8b and the saddle 11 to accommodate the rider's leg length from the hip joint to the ankle, and shorten the front center to reduce the size of the electric three-wheeled bicycle. , the center of gravity of the electric three-wheeled bicycle can be further arranged at the rear of the vehicle body.

Next, in the electric three-wheeled bicycle according to the present embodiment, the front basket 12 for carrying luggage is arranged on the rotation axis of the handle 7 that operates the front wheel 5 driven by the hub motor 50. When operating the handle 7, even when a heavy load is placed on the front basket 12, the handle 7 can be operated without wobbling.

That is, the front wheel 5 receives the driving force of the hub motor 50, and the inertial force acts in the straight direction. Therefore, it is possible to reduce the wobble of the steering wheel operation in elderly people and the like.

On a level ground or an uphill slope, in a state in which the assist operation by the hub motor 50 is possible by operating the switch of the operation unit 18, the pedaling force applied to the pedal 8b by the rider is the front sprocket 9, the rear sprocket 22 and the chain 24 of the rear wheel drive mechanism. One rear wheel 21 is one-wheel driven via. Further, the torque sensor unit 13 detects the torque derived from the human power generated by the pedaling force applied to the pedal 8b, and controls the motor output of the hub motor 50 of the front wheel drive mechanism according to the detected torque derived from the human power. It assists the driving force necessary for running.

In this way, the electric three-wheeled bicycle combines one-wheel drive in which one of the rear wheels 21 is driven by human power and front-wheel drive in which the hub motor 50 drives one of the front wheels 5 to pull the vehicle body. This improves straightness.

That is, by driving the front wheels by the hub motor 50, the risk of skewing is eliminated, and the need to finely adjust the course by operating the steering wheel to maintain the course is reduced. It is possible to suppress the swaying of the electric three-wheeled bicycle, and improve the straightness of the electric three-wheeled bicycle and the safety of the driving operation.

In addition, by providing one-wheel drive of the rear wheels 21 by human power and front-wheel drive by the hub motor 50, even if one of the rear wheels 21 driven by the one-wheel drive spins due to the presence of an obstacle or the like, the hub motor 50 drives the front wheels. By driving, the electric three-wheeled bicycle can move forward without stopping.

Next, when the rider does not apply force to the pedal 8b on a downhill and the motor output of the hub motor 50 is lost, the hub motor 50 operates as a regenerative brake to assist the braking force. That is, the torque sensor unit 13 operates the hub motor 50 as a regenerative brake when the rate of increase in the rotation speed of the front wheels 5 per unit time exceeds the set value. Therefore, the braking force is applied even if the elderly person does not operate the brake, and the running speed is reduced, thereby improving the safety of the elderly person when the vehicle is running.

In addition, when elderly people grip the brake levers 71a and 71b to operate the brakes and perform mechanical braking relying on human power with the front brake device 73 and the rear brake device 74, the physical load in the brake operation is reduced. In addition, even when the braking force relying on human power due to handbrake operation is weak, the braking force is assisted by the regenerative brake of the hub motor 50, so that a reliable braking force can be ensured.

Furthermore, for people with weak grip strength, such as the elderly, it is a heavy physical burden to keep gripping the brake levers 71a and 71b strongly. By acting as a supplement, even on long downhills and steep downhills, the regenerative braking assists the braking force, reducing the brake operation force required for braking, while reducing the mechanical power required for braking. Combined with braking, it is possible to secure sufficient braking force and prevent accidents such as falls and collisions.

In addition, since the brake switches 75a and 75b, which function as regenerative switches, are turned ON/OFF in conjunction with the braking operation of the brake levers 71a and 71b, the rotation speed of the front wheels 5 can be controlled regardless of whether the road is flat, uphill, or downhill. Regardless, the regenerative braking of hub motor 50 can be activated at any time.

Furthermore, when the rider operates the brake levers 71a and 71b, the regenerative switches of the brake switches 75a and 75b are turned on, and the hub motor 50 is deactivated, resulting in no motor output. , even if the rider carelessly applies a pedaling force to the pedal 8, the vehicle does not start suddenly, and high safety can be ensured.

INDUSTRIAL APPLICABILITY The present invention is applied to electric three-wheeled bicycles, and is particularly useful for electric three-wheeled bicycles for elderly people.

Reference Signs List 1 electric tricycle 2 body frame 3 front frame 4 rear frame 5 front wheel 5a rotation axis 6 fork 7 handle 8 crank 8a crankshaft 8b pedal 9 front sprocket 10, 10a seat post 10b saddle fixing bracket 10c post groove 10d opening 10e bolt 10f detent part 11 saddle 12 front basket 13 torque sensor knit 14 battery 21 rear wheel 22 rear sprocket 23 rear basket 32 down tube 33 seat tube 33a seat tube lower end 33b lower seat tube 33c offset part 33d upper seat tube 34 gusset 35 Hanger tube 36 Rear tube 50 Hub motor 51 Hub 52a, 52b Hub support shaft 53 Side rotating part 54 Fixed part 55 Rotating part 56 Spoke 59 Stator 60 Rotor 61 Planetary gear mechanism 71a, 71b Brake lever 73 Front brake device 74 Rear brake device 75a, 75b brake switch

Claims (7)

An electric three-wheeled bicycle with one front wheel and two rear wheels,
a front frame;
a rear frame;
a hub motor having a planetary gear mechanism disposed within the hub of the front wheel ;
a torque sensor unit that functions as a control device for detecting human-power-derived torque generated by pedaling force and controlling the motor output of the hub motor according to the detected human-power-derived torque;
The front frame has a fork that supports the front wheel and a head tube that supports a handlebar, a seat tube that holds a seat post on which a saddle is arranged, and a torque sensor unit that rotatably holds the pedals. An electric three-wheeled bicycle characterized by: 2. The electric three-wheeled bicycle according to claim 1, wherein the hub motor operates as a regenerative brake by rotating the front wheel when not driven. 3. The electric three-wheeled bicycle according to claim 2, wherein the control device activates regenerative braking of the hub motor when the rate of increase in the number of rotations of the front wheels per unit time exceeds a set value while the hub motor is not driven. . When the hub motor is not driven, the rotor rotates with the rotation of the front wheels.
4. The electric three-wheeled bicycle according to claim 3, wherein the controller measures the number of rotations of the front wheel based on the number of rotations of the rotor when the hub motor is not driven. The brake lever provided on the handle has a regenerative switch that operates ON/OFF in conjunction with the operation of the brake lever,
5. The electric vehicle according to any one of claims 2 to 4, wherein the control device stops the motor output of the hub motor and operates the regenerative brake when the regenerative switch is turned on regardless of the number of revolutions of the front wheels. three-wheeled bicycle. 6. The electric three-wheeled bicycle according to any one of claims 1 to 5, wherein a basket for carrying a load is arranged on the rotation axis of the handle. 7. The electric three-wheeled bicycle according to any one of claims 1 to 6, wherein the center of gravity is offset toward the rear of the vehicle body when a rider is on the bicycle.

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