JP6982825B2 - Electric three-wheeled bicycle - Google Patents

Description

The present invention relates to an electric three-wheeled bicycle and relates to a frame structure for applications such as for the elderly.

Conventionally, there are roughly two types of bicycles for the elderly, a three-wheeled vehicle type and a four-wheeled vehicle type, and the three-wheeled vehicle type has two front wheels and one rear wheel. And, there is a form in which the front wheel is one wheel and the rear wheel is two wheels.

Comparing the three-wheeled vehicle type bicycle for the elderly and the four-wheeled vehicle type bicycle for the elderly, there are the following differences. In terms of riding sensation, the three-wheel type elderly bicycle is closer to a normal bicycle, and in terms of running speed, the three-wheel type elderly bicycle is easier to achieve faster running speed. Can be done. Further, regarding running stability, the four-wheel type bicycle for the elderly is less likely to fall, and therefore, the four-wheel type bicycle for the elderly is suitable for the elderly who are particularly inferior in physical ability.

In addition, there are two types of bicycles for the elderly, one is an electrically assisted bicycle type and the other is a general bicycle type. Naturally, the electrically assisted bicycle requires less physical burden to drive the pedals on a slope, and starts. It can be said that it is kind to the elderly in that it is smooth and there is little wobbling of the handle.

In addition, some electrically power 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 arranged in the hub of the rear wheel and operates when the pedal is rotated in the direction opposite to that during forward traveling, and a coaster brake. When the coaster brake is operated, the electric motor is provided with a control unit for performing a regenerative braking operation or a braking operation.

Japanese Patent No. 4959858

There are the following problems in the development of electric three-wheeled bicycles, especially electric three-wheeled bicycles for the elderly.

The conventional three-wheeled vehicle is not limited to the electric three-wheeled bicycle, and its stability is poor due to its structural cause, so that it is easy to fall when cornering at a high speed. In particular, a three-wheeled vehicle having two front wheels and one rear wheel has a structural cause of being prone to tipping over.

In a three-wheeled vehicle with two front wheels and one rear wheel, if the required distance is secured between the handlebar and the saddle, the riding position (saddle position) on which the weight of the rider acts is set on the rear wheel side. .. Therefore, the center of gravity of the three-wheeled bicycle with a person on it moves away from the front wheels of the two wheels and acts at a position closer to the rear wheel side of one wheel. Therefore, it is easy to fall 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 far from the front wheel of one wheel and closer to the rear wheel side of the two wheels. It works. Therefore, it becomes difficult to fall in cornering.

Further, in the electric three-wheeled bicycle, a motor unit is 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 this force transmission, a one-wheel drive system is adopted in which a driving force is applied to only one of the two rear wheels. Therefore, if the drive wheels of the rear wheels are derailed in a groove or the like by mistake in the course, the drive wheels slip and the electric three-wheeled bicycle cannot move.

Further, since the elderly person has a weak grip strength, he / she cannot firmly grip the brake lever of the steering wheel, and there is a problem that he / she cannot exert a strong braking force because the brake operation force is weak. Especially on long downhills and steep downhills, it is necessary to continue the braking operation to squeeze the brake lever, which increases the physical burden on elderly people with weak grip strength and lack of endurance. It is a factor that causes a fall or a collision accident because it cannot obtain power.

In addition, elderly people have a large amount of wobbling when operating the steering wheel due to physical factors, and especially when luggage is put in the basket provided on the front wheel side, the weight of the steering wheel is likely to cause an accident such as a fall. ..

The present invention solves the above-mentioned problems, and an object of the present invention is to provide an electric three-wheeled bicycle in which the center of gravity of the rider in a riding state is acted on a position close to the rear wheel side of the two wheels. do.

In order to solve the above problems, the electric three-wheeled bicycle according to the present invention is an electric three-wheeled bicycle having one front wheel and two rear wheels, and has a seat tube for arranging a saddle and a torque having a crank shaft. Equipped with a sensor unit, the crank shaft is located in front of the lower end of the seat tube, the saddle is shifted from the position on the axis of the seat tube to the offset position on the rear side of the vehicle body, and the hanger is on the front side of the vehicle body of the gusset to which the torque sensor unit is attached. The feature is that the tube is connected, the lower end of the seat tube is connected to the rear side of the vehicle body of the gusset, and the battery is placed above the gusset.

The electric three-wheeled bicycle according to the present invention is an electric three-wheeled bicycle having one front wheel and two rear wheels, and includes a seat tube for arranging a saddle and a torque sensor unit having a crank shaft, and the crank shaft is Located in front of the lower end of the seat tube, the saddle is shifted from the position on the axis of the seat tube to the offset position on the rear side of the car body, and the hanger tube is connected to the front side of the car body of the gusset to which the torque sensor unit is attached, and the car body of the gusset The lower end of the seat tube is connected to the rear side, and the battery is placed above the gusset.

The electric three-wheeled bicycle according to the present invention is characterized in that the seat tube is composed of a lower seat tube and an upper seat tube, and the upper seat tube is shifted to an offset position on the rear side of the vehicle body of the lower seat tube.

In the electric three-wheeled bicycle according to the present invention, the saddle is supported by the seat tube via the seat post, the seat post bends to the rear side of the vehicle body with respect to the axis of the seat tube, and the end portion of the seat post on the rear side of the vehicle body. The feature is that the saddle is placed in.

In the electric three-wheeled bicycle according to the present invention, the seat post holds the saddle fixing bracket for fixing the saddle movably in the axial direction of the seat post, and extends in the axial direction toward the lower surface side within the moving range of the saddle bracket. The saddle fixing bracket has a post groove portion, and is characterized by comprising a detent portion that engages with the post groove portion to prevent the seat post from rotating around the axis.

In the electric three-wheeled bicycle according to the present invention, the torque sensor unit having a hub motor arranged in the hub of the front wheel and mounted below the gusset detects the torque derived from human power generated by the pedaling force of the pedal, and is derived from the detected human power. It is characterized in that the motor output of the hub motor is controlled according to the torque of the hub motor.

In the electric three-wheeled bicycle according to the present invention, the hub motor is characterized in that it performs a regenerative operation for generating regenerative power when it is not in operation.

In the electric three-wheeled bicycle according to the present invention, the hub motor is characterized in that it operates as a regenerative brake by the rotation of the front wheels when it is not driven.

The electric three-wheeled bicycle according to the present invention is characterized in that the front frame and the rear frame forming the vehicle body frame are relatively swingable via a swing mechanism.

The electric three-wheeled bicycle according to the present invention is characterized in that the front frame and the rear frame forming the vehicle body frame are integrally fixed.

According to the electric three-wheeled bicycle according to the present invention, the seat tube in which the saddle is arranged and the crank shaft arranged in the torque sensor unit have an offset positional relationship in the front-rear direction of the vehicle body, and the saddle is on the axis of the seat tube. By shifting from the position of to the rear side of the vehicle body, the front center, which is the distance between the axis of the crank shaft and the center of rotation of the front wheels, can be shortened, making it possible to make a compact electric three-wheeled bicycle. While achieving compactness, the center of gravity of the electric three-wheeled bicycle with the rider on board can be placed at the rear of the vehicle body. Therefore, it becomes difficult to fall in cornering.

Also, when adjusting the saddle height from the ground to the saddle by moving the saddle on the axis of the seat tube as in the past, it is inconvenient when adjusting the saddle height to a short rider. Occurs. That is, when the saddle height is lowered, the distance between the pedal and the saddle that rotates around the crank axis becomes short, which becomes a factor that hinders the rider from pedaling.

However, the seat tube on which the saddle is placed and the crank shaft have an offset positional relationship in the front-rear direction of the vehicle body, so that there is sufficient distance between the pedal and saddle to accommodate the leg length from the rider's hip joint to the ankle. Can be secured.

Also, by shifting the saddle from the position on the axis of the seat tube to the rear side of the vehicle body, even if the saddle height is lowered, the leg length from the rider's hip joint to the ankle can be accommodated between the pedal and the saddle. A sufficient distance can be secured, and the center of gravity of the electric three-wheeled bicycle can be further arranged behind the vehicle body.

In addition, the seat post that supports the saddle bends to the rear side of the vehicle body, and the saddle fixing bracket that fixes the saddle is movably held in the axial direction of the seat post, so that the saddle height is kept constant and the saddle position. Can be easily changed, a sufficient distance can be secured between the pedal and saddle to accommodate the leg length from the rider's hip joint to the ankle, and the center of gravity of the electric three-wheeled bicycle can be further increased. Can be placed behind.

Front view of an electric three-wheeled bicycle showing an embodiment of the present invention. Sectional drawing which shows the hub motor in the same embodiment Enlarged view showing the handle portion in the same embodiment Enlarged view showing the frame structure in the same embodiment Enlarged view showing the frame structure in other embodiments of the same embodiment. Enlarged view showing the seat tube structure in the embodiment of the present invention Enlarged view showing the seat tube structure in another embodiment. Enlarged view showing the seat tube structure in the same embodiment Front view of the saddle according to the embodiment of the present invention Back view of the saddle Rear view of the saddle Back perspective view of the saddle Enlarged view showing the conventional frame structure

Embodiments of the present invention will be described with reference to the drawings.
(overall structure)
As shown in FIGS. 1 to 3, the body frame 2 of the electric three-wheeled bicycle 1 is divided into a front frame 3 and a rear frame 4. The front frame 3 includes a head tube 31, a down tube 32, a seat tube 33, a rear tube 36, and a seat stay 37.

The head tube 31 rotatably supports the fork 6 and the handle 7 that support the front wheel 5.

Further, 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 knit 13 forming a control unit, and a battery 14. That is, in the present embodiment, the hub motor 50, the torque sensor knit 13, and the battery 14 form a front wheel drive mechanism that relies on the motor output. The front basket 12 is provided at the center of the handle 7 on the rotation axis of the handle 7, and the center of gravity of the load acts near the rotation axis of the handle 7.

The rear frame 4 is provided with a pair of left and right rear wheels 21 and 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 hung between the front sprocket 9 and the rear sprocket 22, and the rotational force applied by the pedal 8b is transmitted to one of the rear wheels 21 via the chain 24. That is, in the present embodiment, the pedal 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 swing 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 swing mechanism. It is movable. The swing mechanism is not always necessary, and the front frame 3 and the rear frame 4 may be integrally fixed.

The hub motor 50 provided on the front wheel 5 has, for example, the structure shown in FIG. Various types of hub motors can be adopted, and the hub motor 50 is not limited to this embodiment.

As shown in FIG. 3, the hub motor 50 according to the present embodiment is built in a metal hub 51 arranged in the center of the front wheel 5. In the hub 51, the hub support shafts 52a and 52b on both sides are fixed to the fork 12, respectively, and the hub support shaft 52a on one side rotatably supports the metal side rotating portion 53 of the hub 51 on the other side. The hub support shaft 52b fixedly supports the fixed portion 54 of the hub 51, and the fixed portion 54 rotatably supports the metal rotating portion 55 forming the 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. The 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 and the tire 58.

In the hub motor 50, the stator 59 is fixedly supported by the fixed portion 54, and the rotor 60 is 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 integrally formed with the rotor 60, an internal gear 63 provided on the side rotating portion 53, and a planet carrier 64 rotatably supported by a hub support shaft 52a on one side. It is composed of a plurality of planetary gears 65 rotatably supported by the planetary carrier 64 and meshed with the internal gear 63 and the sun gear 62, and transmits the driving force of the hub motor 50 to the hub 51.

The hub motor 50 in the present embodiment can perform a regenerative operation of generating regenerative power to charge the battery 22 when the motor is not in operation and can operate as a regenerative brake. Further, the torque sensor unit 13 is a control device that detects a 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 the grips attached to both ends, and the brake levers 71a and 71b are rotatably supported by the handle 7.

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

Further, a shift operation unit 16 for switching the shift stage of the internal transmission 15 interlocked with the rear wheel 21 is attached to one of the handles 7 (for example, the right side), and is provided in the shift operation unit 16. By rotating the operation grip 16a, the internal transmission 15 operates in conjunction with the speed change wire 17.

An operation unit 18 is attached to the other side of the handle 7, and the operation unit 18 has a switch button (not shown) for electrically turning on / off the additional operation (so-called assist operation) of the driving force by the hub motor 50. It has multiple.

Further, brake switches 75a and 75b for detecting the operating state of the brake levers 71a and 71b are arranged at locations where the brake levers 71a and 71b are attached to the handle 7. These brake switches 75a and 75b act as regenerative switches that operate ON / OFF in conjunction with the brake operation of the brake levers 71a and 71b, and the torque sensor unit 13 detects the operating state of the brake levers 71a and 71b for regenerative charging. Control the function to work properly.

In the present embodiment, the torque sensor unit 13 has a control function for operating the regenerative brake of the hub motor 50 when the rate of increase of the rotation speed of the front wheels 5 per unit time exceeds a set value when the hub motor 50 is not driven. is doing. The rotation speed of the front wheel 5 can be measured by a tachometer (not shown) provided separately, but in the present embodiment, the rotor 60 rotates with the rotation of the front wheel 5 when the hub motor 50 is not driven. , The rotation speed of the rotor 60 at the time of non-driving is measured by a sensor (not shown) provided in the hub motor 50, and the rotation speed of the front wheel 5 is measured based on the rotation speed 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 rotatably holds the pedal 8b around the axis of the crank shaft 8a. Further, the torque sensor unit 13 rotatably supports the front sprocket 9 via the crank shaft 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 located on the front side of the vehicle body of the gusset 34 and is connected between the gusset 34 and the down tube 32. The seat tube 33 is arranged by connecting the lower end 33a of the seat tube to the rear side of the vehicle body of the gusset 34, and the hanger tube 35 and the crank shaft 8a are located in front of the lower end 33a of the seat tube.

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, and the upper seat tube is formed by the offset portion 33c. The 33d is shifted to the offset position on the rear side of the vehicle body of the lower seat tube 33b and arranged.

The upper seat tube 33d holds the seat post 10 so as to be retractable along the axial direction of the upper seat tube 33d, 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 arranges the yagura 92 on the lower surface of the ship line 91 forming the structural material, and the ship line 91 and the base 96 via the coil 94 and the bolt 95 covered by the cover 93. Is connected, and the top 97 is attached to the base 96.

The yagura 92 is provided with a saddle fixing bracket 92a on the ship line 91 via a yagura adjusting bolt 92b. By tightening the yagura adjustment bolt 92b, the saddle fixing bracket 92a is tightened to the seat post 10 to fix the saddle 11 to the seat post 10.

According to the electric three-wheeled bicycle according to the present embodiment described above, the seat tube 33 in which the saddle 11 is arranged and the crank shaft 8a arranged in the torque sensor unit 13 have an offset positional relationship in the front-rear 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 crank shaft 8a and the rotation axis 5a of the front wheel 5, can be shortened, resulting in a compact electric three-wheeled bicycle. It is possible to place the center of gravity of the electric three-wheeled bicycle in the riding state at the rear of the vehicle body while realizing the compactness.

In the conventional configuration, that is, as shown in FIG. 13, when the saddle height from the ground to the saddle 11 is adjusted by moving the saddle 11 on the axis of the seat tube 33, the height is short and the foot is short. Inconvenience occurs when adjusting the saddle height to a short rider. That is, when the saddle height is lowered, the distance between the pedal and the saddle 11 between the pedal 8b rotating around the crank axis and the saddle 11 becomes short, which becomes a factor that hinders the rider from pedaling the pedal 8b.

However, the seat tube 33 on which the saddle 11 is arranged and the crank shaft 8a arranged on the torque sensor unit 13 have an offset positional relationship in the front-rear direction of the vehicle body, so that between the pedal 8b and the saddle 11 from the rider's hip joint. Sufficient distance can be secured to accommodate the leg length to the ankle.

Further, the lower seat tube 33b shifts to the rear side of the vehicle body via the offset portion 33c, and the saddle 11 shifts from the position on the axis of the lower seat tube 33b to the rear side of the vehicle body, whereby the saddle height is increased. Even if the height is lowered, a sufficient distance can be secured between the pedal 8b and the saddle 11 to accommodate the leg length from the rider's hip joint to the ankle, and the center of gravity of the electric three-wheeled bicycle can be further increased. Can be placed behind.
(Other frame structure)
The above-mentioned frame structure can also be the structure described below.

That is, as shown in FIG. 5, the down tube 32 is connected to the front side of the vehicle body of the gusset 34, the rear tube 36 is connected to the rear side of the vehicle body of the gusset 34, and the lower end 33b of the seat tube 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 a single straight tube. The 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 the 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, and is within the moving range of the saddle fixing bracket 10b. Has a post groove portion 10c extending in the axial direction on the lower surface side.

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

According to this frame structure, the saddle 11 is shifted from the position on the 33 axis of the seat tube to the offset position on the rear side of the vehicle body. Further, by holding the saddle fixing bracket 10b for fixing the saddle 11 movably in the axial direction of the seat post 10a, the saddle height is kept constant and the saddle position can be easily changed in the front-rear direction of the vehicle body. A sufficient distance can be secured between the pedal 8b and the saddle 11 to accommodate the leg length from the rider's hip joint to the ankle, and the front center is shortened to make the electric three-wheeled bicycle more compact. , The center of gravity of the electric three-wheeled bicycle can be further arranged behind the vehicle body.

Next, in the electric three-wheeled bicycle according to the present embodiment, the front basket 12 on which the luggage is placed is arranged on the rotation axis of the handle 7 that operates the front wheel 5 driven by the hub motor 50, so that riders such as elderly people can use it. When operating the handle 7, the handle can be operated without the handle 7 swaying even when a heavy load is placed on the front basket 12.

That is, an inertial force in the straight direction acts on the front wheel 5 that receives the driving force of the hub motor 50, and as a result, the swing of the handle 7 is reduced when the electric three-wheeled bicycle is traveling, and the center of gravity of the luggage is near the rotation axis of the handle 7. It is possible to reduce the wobbling of the steering wheel operation in elderly people and the like.

On flat ground or uphill, the pedaling force applied to the pedal 8b by the rider in a state where the assist operation by the hub motor 50 is possible by operating the switch of the operation unit 18 is the front sprocket 9 and the rear sprocket 22 and the chain 24 of the rear wheel drive mechanism. One rear wheel 21 is driven by one wheel via the above. Further, the torque sensor unit 13 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 of the front wheel drive mechanism according to the detected torque derived from human power to control the motor output of the electric three-wheeled bicycle. It assists the driving force required for driving.

As described above, the electric three-wheeled bicycle is performed by combining one-wheel drive in which one of the rear wheels 21 is manually 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, there is no risk of skewing, the need to fine-tune the course by operating the steering wheel to maintain the course is reduced, and the handle 7 is used for elderly people and physically weak people. It is possible to suppress the wobbling of the bicycle, and the straightness of the electric three-wheeled bicycle and the safety of the driving operation are improved.

Further, by providing one-wheel drive of the rear wheel 21 by human power and front-wheel drive by the hub motor 50, even if one of the rear wheels 21 to be driven by one wheel slips due to the presence of an obstacle or the like, the front wheel is driven by the hub motor 50. By driving, the electric three-wheeled bicycle can proceed without stopping.

Next, on a downhill, when the rider does not apply a pedaling force to the pedal 8b and the motor output of the hub motor 50 disappears in a non-driving state, the hub motor 50 operates as a regenerative brake to assist the braking force. That is, when the rate of increase of the rotation speed of the front wheels 5 per unit time exceeds the set value, the torque sensor unit 13 operates the hub motor 50 as a regenerative brake. Therefore, the braking force is applied even if the elderly or the like does not perform the braking operation, the traveling speed is reduced, and the safety during traveling of the elderly or the like is improved.

Further, when an elderly person or the like grips the brake levers 71a and 71b to perform a brake operation and mechanically brakes by the front brake device 73 and the rear brake device 74 by relying on human power, the physical load in the brake operation. Even when the braking force that relies on human power due to the handbrake operation is weak, the regenerative brake of the hub motor 50 assists the braking force, so that a reliable braking force can be secured.

Further, for people with weak grip such as elderly people, it is a heavy physical burden to keep gripping the brake levers 71a and 71b strongly, but even if the brake levers 71a and 71b are not gripped, the braking force by the regenerative brake of the hub motor 50 is applied in a timely manner. By acting as an auxiliary, even on long downhills and steep downhills, by assisting the braking force with regenerative braking, the braking operation force required for braking is reduced, and mechanically by hand brake operation. By combining with braking, it is possible to secure sufficient braking force and prevent falls and collision accidents.

Further, since the brake switches 75a and 75b, which form a regenerative switch in conjunction with the brake operation of the brake levers 71a and 71b, are turned on and off, the number of rotations of the front wheels 5 is not limited to flat ground, uphill or downhill. Nevertheless, the regenerative brake of the hub motor 50 can be activated at any time.

Further, when the rider operates the brakes of the brake levers 71a and 71b, the regenerative switch of the brake switches 75a and 75b is turned on, the hub motor 50 is not operated, and the motor output is lost. Even if the rider carelessly applies the pedaling force to the pedal 8, the vehicle does not start suddenly and high safety can be ensured.

The present invention is applied to an electric three-wheeled bicycle, and is particularly useful for an electric three-wheeled bicycle for the elderly.

1 Electric three-wheeled bicycle 2 Body frame 3 Front frame 4 Rear frame 5 Front wheel 5a Rotating axis 6 Fork 7 Handle 8 Crank 8a Crank shaft 8b Pedal 9 Front sprocket 10, 10a Seatpost 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 braking device 74 Rear braking device 75a, 75b Brake switch

Claims (10)

An electric three-wheeled bicycle with one front wheel and two rear wheels, equipped with a torque sensor unit having a seat tube for arranging the saddle and a crank shaft, the crank shaft is located in front of the lower end of the seat tube, and the saddle. Is shifted from the position on the axis of the seat tube to the offset position on the rear side of the car body, connect the hanger tube to the front side of the car body of the gusset to which the torque sensor unit is attached, and connect the lower end of the seat tube to the rear side of the car body of the gusset. An electric three-wheeled bicycle featuring a battery placed above the gusset. An electric three-wheeled bicycle with one front wheel and two rear wheels, equipped with a torque sensor unit having a seat tube for arranging the saddle and a crank shaft, the crank shaft is located in front of the lower end of the seat tube, and the saddle. Is shifted from the position on the axis of the seat tube to the offset position on the rear side of the car body, connect the down tube to the front side of the car body of the gusset to which the torque sensor unit is attached, connect the rear tube to the rear side of the car body of the gusset, and rear An electric three-wheeled bicycle characterized by connecting the lower end of the seat tube to the tube and placing the battery above the gusset. The electric three-wheeled bicycle according to claim 1 or 2, wherein the seat tube is composed of a lower seat tube and an upper seat tube, and the upper seat tube is shifted to an offset position on the rear side of the vehicle body of the lower seat tube. The saddle is supported by the seat tube via the seat post, the seat post bends to the rear side of the vehicle body with respect to the axis of the seat tube, and the saddle is arranged at the rear end of the vehicle body of the seat post. The electric three-wheeled bicycle according to claim 1 or 2. The seat post holds the saddle fixing bracket for fixing the saddle movably in the axial direction of the seat post, and has a post groove portion extending in the axial direction on the lower surface side within the moving range of the saddle bracket.
The electric three-wheeled bicycle according to claim 4, wherein the saddle fixing bracket includes a detent portion that engages with the post groove portion to detent the seat post around the axis. The torque sensor unit, which has a hub motor placed inside the hub of the front wheel and is installed below the gusset, detects the torque derived from human power generated by the pedaling force of the pedal, and outputs the motor output of the hub motor according to the detected torque derived from human power. The electric three-wheeled bicycle according to any one of claims 1 to 5, wherein the bicycle is controlled. The electric three-wheeled bicycle according to claim 6, wherein the hub motor performs a regenerative operation that generates regenerative electric power when the bicycle is not in operation. The electric three-wheeled bicycle according to claim 6, wherein the hub motor operates as a regenerative brake by the rotation of the front wheels when the bicycle is not driven. The electric three-wheeled bicycle according to any one of claims 1 to 8 , wherein the front frame and the rear frame forming the vehicle body frame are relatively swingable via a swing mechanism. The electric three-wheeled bicycle according to any one of claims 1 to 8 , wherein the front frame and the rear frame forming the vehicle body frame are integrally fixed.

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