JP2001106159A - Series hybrid type electric two wheeler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a series hybrid type electric two wheeler that keeps nimbleness of bicycle for having a pipeline for supplying fuel shortened to prevent a carburetor from being heated excessively. SOLUTION: A wheel driving motor 3 is placed at a lower part of a saddle supporting part 12. A fuel tank 26 is placed at an upper part of a rear wheel 2. An engine 25 and a generator 24 are placed between the saddle supporting part 12 of a body frame 4 and the rear wheel 2 in a way that these are placed vertically in line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a series hybrid electric motorcycle including an engine driven generator and a battery.

[0002]

2. Description of the Related Art Conventionally, as one of the electric motorcycles, there is an electric assisted bicycle that travels while assisting human power with the power of a motor. The distance traveled when the motor-assisted traveling is performed using a motor in this type of electric assisted bicycle depends on the remaining capacity of the battery. For this reason, in order to continue traveling over a long distance, a spare battery must be carried and replaced on the way. The battery is charged by connecting a charger using a commercial power supply while the battery is mounted on or removed from the vehicle body. On the other hand, as an electric vehicle, there is a so-called series hybrid electric vehicle equipped with an engine-driven generator that charges a battery that supplies power to a wheel driving motor during traveling. This electric vehicle adopts a configuration in which the electric power generated by the generator and the electric power of the battery are supplied to the motor, and the vehicle runs only by the power of the motor.

[0003]

SUMMARY OF THE INVENTION The present inventors have adopted a series-hybrid configuration in which a generator is driven by an engine to supply power to a battery and a driving motor for an electric two-wheeled vehicle. I thought about eliminating the work of charging the battery. However, in order to achieve this while maintaining the lightness of the motorcycle, there is a problem in that a large and heavy member such as an engine, a generator, and a fuel tank is mounted. For example, a large separation between the engine and the fuel tank not only requires an unnecessarily long fuel supply line, but also requires the use of a fuel pump to supply fuel. In addition, if the interval between the engine and the carburetor is short, the carburetor is excessively heated by the heat of the engine and vapor lock occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is possible to maintain the lightness of a motorcycle, shorten the fuel supply line, and prevent the carburetor from being excessively heated. The aim is to provide a series hybrid electric motorcycle.

[0005]

To achieve this object, a series hybrid electric motorcycle according to the present invention supplies power generated by a generator driven by an engine and power of a battery to a motor for driving a wheel. A hybrid electric motorcycle that travels by transmitting the power of this motor to rear wheels, wherein the motor is provided at a front end portion of a vehicle body frame that rotatably supports a steering fork and is provided at a lower portion of a saddle support portion that supports a saddle. And a fuel tank is disposed above the rear wheel, and the engine and the generator are arranged vertically below the fuel tank in a space between the saddle support portion and the rear wheel. It is arranged as follows. ADVANTAGE OF THE INVENTION According to this invention, an engine and a generator can be mounted using the dead space formed between the saddle support part of a vehicle body frame, and a rear wheel. The fuel tank can be mounted without changing the position of other members.

A series hybrid electric motorcycle according to a second aspect of the present invention is the series hybrid electric motorcycle according to the first aspect of the present invention, wherein the engine is mounted on the rear portion of the upper portion of the frame main body in such a manner that the direction of the axis of the crankshaft is equal to the vehicle width. Along with directing the direction, the cylinder axis is disposed so as to be directed rearward and upward of the vehicle body, and the generator is disposed behind the frame body and below the engine such that the axis direction of the rotating shaft is directed in the vehicle width direction, A carburetor is provided between the engine and the fuel tank. According to the present invention, the power transmission device for transmitting the power of the engine to the generator can be formed so as to extend in the vertical direction on the side of the engine and the generator. Further, since the cylinder head of the engine is located near the fuel tank, the distance between the carburetor and the fuel tank is minimized. The fuel in the fuel tank can be supplied to the vaporizer by gravity.

According to a third aspect of the present invention, there is provided a series hybrid electric motorcycle according to the second aspect, wherein a partition is provided between the engine and the carburetor. According to the present invention, the transfer of heat from the engine to the carburetor can be prevented by the partition.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment Hereinafter, an embodiment of a series hybrid electric motorcycle according to the present invention will be described in detail with reference to FIGS. FIG. 1 is a side view of an electric assist bicycle, which is one of the series hybrid electric motorcycles according to the present invention.
Is an enlarged side view showing a main part, in which the vehicle body frame and the shroud are cut away. FIG. 3 is a plan view of a power unit and a rear wheel drive power transmission device, and FIG.
5 is a cross-sectional view taken along line IV-IV of the power unit, and FIG. 5 is a cross-sectional view taken along line VV of the rear portion of the power transmission device in FIG. FIG.
7 is a front view of the shroud, FIG. 7 is a rear view of the shroud, FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 2, and FIG. 9 is a block diagram schematically showing a configuration of an electric drive system.

In these figures, the reference numeral 1 indicates an electric assist bicycle according to this embodiment. The electrically assisted bicycle 1 has a structure that can adopt a form in which the rear wheel 2 is driven only by human power and a form in which the rear wheel 2 is driven by the combined force of the motor power and human power indicated by reference numeral 3 in FIG. In FIG. 1, reference numeral 4 denotes a vehicle body frame,
Denotes a front fork rotatably supported by the front end of the body frame 4, 6 denotes a front wheel supported by the front fork 5, 7 denotes a steering handle, and 8 denotes a saddle. The body frame 4 is formed by a head pipe 9 that rotatably supports the front fork 5 and a frame main body 10 that is welded to the head pipe 9. The frame main body 10 is formed by casting using an aluminum alloy as a material, and includes a down frame portion 11 extending downward from the head pipe 9, a saddle support portion 12 extending upward from the rear end of the down frame portion 11, A fender section 13 extending from the upper end of the saddle support section 12 to the rear of the vehicle body above the rear wheel 2 and is formed integrally.
As shown in FIG. 8, the down frame portion 11 is formed in a U-shaped cross section that opens downward, and a cover 14 is attached to the opening. In the down frame portion 11, an integrated control controller 15 of an electric drive system and a battery 16 are provided.
Is stored. The integrated controller 15 is housed in the upper part of the down frame part 11, and the battery 16 is housed in the lower part of the down frame part 11. The cover 14 has a large number of through-holes 17 (see FIGS. 2 and 8) formed in portions corresponding to the integrated controller 15.

The lower portion of the saddle support portion 12 is formed in a U-shaped cross section similarly to the down frame portion 11, and
The upper part is formed in a cylindrical shape. At the part connecting the lower part of the saddle support part 12 to the rear end of the down frame part 11,
A power unit 21 that rotatably supports the pedal crankshaft 18 and includes the rear wheel drive motor 3 is mounted. That is, the rear wheel drive motor 3 is supported below the saddle support portion 12. In addition to supporting the motor 3, the power unit 21 supports the rear wheel 2 via a cantilevered rear wheel drive power transmission device 22 described later. As shown in FIG. 2, a seat pillar pipe 8a of the saddle 8 is fitted into and fixed to the cylindrical portion of the saddle support portion 12. The fender portion 13 is formed in a U-shaped cross section that opens downward, and as shown in FIG.
It is formed so as to extend in an arc from the upper end of the saddle support portion 12 to the upper side of the rear wheel 2 in a side view. In this embodiment, a synthetic resin body cover 23 is attached to both sides of the fender portion 13 in the vehicle width direction and both sides of the saddle support portion 12.

The electric assisted bicycle 1 generates electric power for generating electric power for charging the battery 16 and electric power for supplying power to the motor 3 of the power unit 21 between the saddle support portion 12 and the rear wheel 2. A motor 24 and an engine 25 for driving the power generator 24 are arranged to adopt a series hybrid structure. In addition, the fender section 13
Inside and above the rear wheel 2, a fuel tank 26 for storing the fuel of the engine 25 is disposed. The power unit 21 is, as shown in FIG.
Is formed by assembling each member described later. The components to be mounted on the housing 27 include a pedal crankshaft 18 that penetrates the housing 27 in the vehicle width direction.
A motor 3 disposed in front of the vehicle body with respect to the pedal crankshaft 18 and near the pedal crankshaft 18, and a gear type power transmission device 28 mounted on the pedal crankshaft 18.
And a torque detector 29 for detecting the magnitude of human power
(See FIG. 9), a motor 3 controller 30 for controlling the power of the motor 3 (see FIG. 9), a vehicle speed sensor 31 for detecting the vehicle speed, and the like.

As shown in FIG. 4, the pedal crankshaft 18 is rotatably supported by bearings 32 to 34 (three) on a housing 27, and a pedal 36 is connected to both ends via a pedal crank 35. I have. The motor 3 has an output shaft 3a supported by the housing 27 such that the axial direction is directed to the vehicle width direction, and a gear 3 fixed to the output shaft 3a.
5 is a ring gear 36 of the gear type power transmission device 28 described later.
Is engaged. The gear type power transmission device 28 uses the combined force of the human power and the power of the motor 3 to transmit the rear wheel drive power transmission device 2.
And a planetary gearbox 38 connected to the pedal crankshaft 18 via a one-way clutch 37.
, The ring gear 36, and the rear wheel drive power transmission device 2
And an output bevel gear 40 meshing with the second input bevel gear 39. The planetary gear intensifier 38 connects a carrier 41 to the one-way clutch 37, and
The planetary gear 42 rotatably supported by the gear is meshed with the sun gear 43 rotatably supported by the pedal crankshaft 18 and is meshed with the outer peripheral gear 44 fixed to the output bevel gear 40. The ring gear 36 is fixed to the outer peripheral gear 44 so that the power of the motor 3 is transmitted. The one-way clutch 37 has a structure in which power is transmitted only from the pedal crankshaft 18 to the carrier 41. The sun gear 43 has an arm 45 for detecting human power fixed thereto, and this arm 45 and the housing 2
A structure is adopted in which a spring member (not shown) elastically mounted between the first and second members 7 receives a manual reaction force. The torque detector 29 detects the magnitude of human power based on a change in the position of the arm 45. In this embodiment, the vehicle speed sensor 31 has a structure for detecting the vehicle speed based on the rotation of the output bevel gear 40.

The rear wheel drive power transmission device 22 is shown in FIG.
As shown in FIG. 5, the input bevel gear 39 meshing with the output bevel gear 40, and a drive that has a front end fixed to the input bevel gear 39 and extends in the front-rear direction on the left side of the vehicle body of the rear wheel 2. A shaft 46 and an axle 49 gear-coupled to the rear end of the drive shaft 46 via bevel gears 47 and 48.
, A pipe-shaped transmission case 50 that covers the drive shaft 46, the axle housing 27, and the like. The input bevel gear 39 is rotatably supported by the housing 27 of the power unit 21 via bearings 52 and 53. A bevel gear 47 fixed to the rear end of the drive shaft 46, and an axle housing 5 meshed with the bevel gear 47
The bevel gear 48 on one side is rotatably supported by the axle housing 51 via bearings 54 and 55, respectively. Between the bevel gear 48 and the axle 48 on the axle housing 51 side,
A one-way clutch 56 configured to transmit power only from the bevel gear 48 to the axle 49 is provided. The axle 49 is
The hub 2a of the rear wheel 2 is rotatably supported by the protruding portion so as to protrude from the axle housing 51 to the right side of the vehicle body. The transmission case 50 has a front end at the housing 27 of the power unit 21 and a rear end at the axle housing 51.
Connected to each other. Further, a rear wheel brake 58 is attached to the rear end of the transmission case 50 and the axle housing 51.

The motor controller 30 provided in the power unit 21 employs a circuit for controlling the power of the motor 3 so as to be substantially proportional to the magnitude of the human power detected by the torque detector 29. The motor controller 3
0 is a circuit that cuts off the power supply to the motor 3 at a high speed when the vehicle speed detected by the vehicle speed sensor 31 exceeds a predetermined value.

The generator 24 and the engine 25 are shown in FIG.
As shown in FIGS. 6 and 7, the engine 25 is
4 and stored in a box-shaped shroud 61,
It is mounted on the body frame 4 via the shroud 61. The shroud 61 has an air inlet 6 at the lower part on the front side of the vehicle body.
2 and an air outlet 63 at the rear upper part of the vehicle body.
Is formed, and the generator 24 and the engine 25 are cooled by air that flows in from the air inlet 62 and is discharged from the air outlet 63. The lower portion of the shroud 61 on the front side of the vehicle body faces between the power unit 21 and the saddle support portion 12 in the frame body 10 and closes a space formed in the frame body 10 in cooperation with the power unit 21. It is formed as follows. Power unit 21
The space formed between the upper surface of the
Through hole 1 formed in cover 14 of down frame portion 11
It communicates with the atmosphere through 7. As shown in FIG. 8, the integrated controller 15 located at a position corresponding to the through hole 17 has a large number of plate-shaped heat radiation fins 15 a formed at a portion facing the cover 14. This heat radiation fin 1
5a are arranged in parallel so as to be parallel to each other at intervals in the vehicle width direction, and are formed so as to extend along the longitudinal direction of the down frame portion 11. That is, when the electric assisted bicycle travels, the traveling wind flows from the through hole 17 into the down frame portion 11 through the space between the radiating fins 15a. The traveling wind flows backward in the down frame portion 11, flows along the upper surface of the power unit 21, flows into the air inlet 62 of the shroud 61, cools the generator 24 and the engine 25, and cools the air. It is discharged from the exit 63 to the rear of the vehicle body. When traveling wind flows in the down frame portion 11, the traveling wind also cools the battery 16. The direction in which the traveling wind flows is indicated by an arrow in FIG.

As shown in FIG. 9, the generator 24 comprises a motor generator 64 and a motor generator controller 65, and is disposed at the lower end in the shroud 61, that is, near the rear upper portion of the pedal crankshaft 18. Has been established. The motor generator 64 has both functions of a motor and a generator, and is used as a motor when starting the engine 25 and as a generator when generating power. When used as a generator, a structure is employed in which power is generated so as to be substantially proportional to the rotation speed of the engine 25. In addition, this motor generator 6
4 is arranged such that the rotating shaft 64a (see FIGS. 6 and 7) is oriented in the vehicle width direction. In this embodiment,
The engine 25 is integrally connected to a crankcase 25a. Power transmission between the motor generator 64 and the engine 25 is performed by a power transmission device (not shown) disposed on the right side of the vehicle body. In this embodiment, the power transmission device has a structure in which power is transmitted via a chain, but a belt or a gear can be used instead of the chain. The motor generator controller 65
Is connected to the integrated controller 15 to control the start / stop of the engine 25 based on the control signal sent from the integrated controller 15 and to output the electric power generated by the motor generator 64 to the motor 3 of the power unit 21.
And a circuit for supplying the battery 16. As shown in FIG. 9, the battery 16 includes a number of battery cells 66 and a battery fuel gauge 67. The battery cell 66 is composed of a conventionally well-known nickel-metal hydride single cell or nickel cadmium single cell or the like, and these are connected in series.

The engine 25 is a four-cycle air-cooled single-cylinder engine, and the shroud is arranged so that the axis of a crankshaft 68 (see FIG. 2) is oriented in the vehicle width direction and the cylinder axis is oriented rearward and upward. 61 supported. In this embodiment, the engine 25 is elastically supported by the shroud 61 together with the generator 24 via an elastic member (not shown).
Are elastically supported by the frame main body 10 via an elastic member (not shown). A carburetor 71 and an exhaust pipe 72 are connected to a cylinder head 69 of the engine 25 via an intake pipe 70. The carburetor is disposed between the cylinder head 69 and the fuel tank 26,
In the portion facing the fuel tank 26, the fuel is stored in the fuel tank 2
6 is connected to the fuel supply pipe 73. The fuel supply pipe 73 extends substantially horizontally from a lowermost portion of the fuel tank 26 to a carburetor 71 located in front of the vehicle body. The throttle valve 74 (see FIG. 9) of the vaporizer 71 has a structure driven by an actuator (not shown). The actuator (throttle opening) is controlled by the integrated controller 15.
The engine 25 is started by driving a crankshaft 68 by a motor generator 64.
Is stopped when the integrated controller 15 opens the ignition circuit.

The exhaust pipe 72 extends rearward from the front of the cylinder head 69 through the right side of the vehicle body from the cylinder head 69, and connects a silencer 75 to the rear end. The rear end of the exhaust pipe 72 is piped so as to pass near the side of the air outlet 63 of the shroud 61,
The traveling wind exhausted from 1 hits the rear end of the exhaust pipe 72 and the silencer 75 to cool them. The fuel tank 26 is formed of an aluminum alloy and is fixed to the inner surface of the fender 13 of the vehicle body frame 4. The fuel supply pipe 26a of the fuel tank 26 penetrates the fender section 13 and protrudes upward.
The lower portion of the fuel tank 26 is curved along the outside of the rear wheel 2 so that the fuel tank 26 can be disposed as close to the upper edge of the rear wheel 2 as possible.

The integrated controller 15 controls the charge / discharge of the battery 16 and the number of revolutions of the engine 25. As shown in FIG. 9, a throttle control for controlling a throttle valve driving actuator of the carburetor 71 is provided. The display device 78 is connected to the display device 78, including a means 76, a remaining capacity setting means 77 for setting the remaining capacity of the battery 16, and the like. The display device 78 includes a warning light (not shown) and is provided near the steering handle 7. When the battery 16 is deteriorated, the integrated controller 15 turns on the warning light. Battery 1
The deterioration of 6 is detected by a remaining capacity setting unit 77 described later. When the remaining capacity set by the remaining capacity setting means 77 falls below a predetermined lower limit, the throttle control means 76 starts the engine 25 to generate power by the generator 24.
Charging is started, and when the remaining capacity reaches a predetermined upper limit, the engine 25 is stopped to generate power by the generator 24.
A circuit is used to stop charging. That is, when the remaining capacity of the battery 16 falls below the lower limit value, the engine 25 generates the generator 2 until the remaining capacity reaches the upper limit value.
4 is driven and charged with the electric power generated by the generator 24. Also, during charging, the throttle control means 76 controls the throttle valve 74 so that the smaller the difference between the remaining capacity value detected by the remaining capacity setting means 77 during charging and the lower limit, the greater the amount of generated power. Control. Further, the throttle control unit 76 is configured such that the remaining capacity setting unit 77
When the deterioration of the throttle valve 6 is detected, the throttle valve 74 is driven so that the motor 3 is driven only by the electric power generated by the generator 24.
Is controlled. This control is performed so that the output of the motor 3 becomes the average value of the change in the manual torque.
That is, when the pedal 36 is depressed, the engine 25
When the pedaling force disappears and the pedaling force disappears, the rotational speed does not decrease. Generator 24
When the motor 3 is driven only by the generated power, the integrated control controller 15 controls the charging of the battery 16 to be kept as low as possible. For example, the lower limit value is changed so as to be smaller by a predetermined value, and the charge / discharge circuit is shut off when the remaining capacity value exceeds the lower limit value. Even after the charging / discharging is stopped, the engine 25 continues to operate. The remaining capacity setting means 77 includes a battery 16
In this embodiment, a remaining capacity value is assigned to the voltage and current at the time of charging / discharging of the battery 16, and the remaining capacity value is used to control the charging / discharging of the battery 16. When the degree of the battery 16 is relatively small, the remaining capacity value read from the map is used, and when the degree of deterioration of the battery 16 is relatively large, the remaining capacity value read from the map is corrected in accordance with the charge / discharge state. The value is used as the remaining capacity value of the battery 16.

In the series hybrid electric assist bicycle constructed as described above, the motor 3 is disposed near the pedal crankshaft 18, and the fuel tank 26 is disposed above the rear wheel 2. Saddle support 12
Since the engine 25 and the generator 24 are arranged between the rear wheel 2 and the rear wheel 2, the dead space formed between the saddle support portion 12 and the rear wheel 2 is used. Thus, the engine 25 and the generator 24 can be mounted. Moreover, the fuel tank 26 can be mounted without changing the positions of other members. Therefore, a compact and light series hybrid electric assist bicycle 1 can be manufactured. A generator 24 is arranged near the rear upper portion of the pedal crankshaft 18 so that the axis of the rotating shaft 64a is oriented in the vehicle width direction.
The engine 25 is disposed above the engine 25 such that the axis of the crankshaft 68 points in the vehicle width direction and the cylinder axis points in the rear upper direction of the vehicle body. Is provided, a power transmission device for transmitting power between the engine 25 and the generator 24 can be formed so as to extend vertically on the sides of the engine 25 and the generator 24. The transmission device can prevent the vehicle body from becoming longer in the front-rear direction. Further, since the cylinder head 69 of the engine 25 is located near the fuel tank 26, the distance between the carburetor 71 and the fuel tank 26 is shortest. Moreover, the fuel tank 2
6 can be supplied to the vaporizer 71 by gravity. Furthermore, since the upper wall (partition) of the shroud 61 is located between the engine 25 and the carburetor 71, the transfer of heat from the engine 25 to the carburetor 71 can be prevented by the upper wall. . For this reason, the carburetor 71 can be arranged close to the engine 25, and the whole engine including the auxiliary equipment can be made compact.

Second Embodiment The power transmission between the power unit 21 and the rear wheel 2 can be performed by a chain. An example of adopting this mode will be described in detail with reference to FIG. FIG. 10 is a side view showing another embodiment using a chain-type rear wheel drive power transmission device. In the figure, the same or equivalent members as those described with reference to FIGS. 1 to 9 are denoted by the same reference numerals, and detailed description is omitted. The power unit 21 of the battery-assisted bicycle 1 shown in FIG.
The motor 3 is disposed behind the pedal crankshaft 18 in the vehicle body, and a combined force of the power of the motor 3 and the human power for rotating the pedal crankshaft 18 is transmitted to the rear wheel 2 via the chain 81. I have. The chain 81 is disposed on the right side of the vehicle body with respect to the rear wheel 2. The rear wheel 2 includes a chain stay 82 extending rearward of the vehicle body from the rear end of the power unit 21, a seat stay 83 extending rearward downward from the upper end of the saddle support portion 12 of the vehicle body frame 4, It is supported by a rear frame 85 constituted by an end bracket 84 connecting the ends.
The rear frame 85 is provided on both sides of the rear wheel 2 so as to form a pair. In this manner, the structure that transmits power to the rear wheel 2 by using the chain 81 has the same effect as that of the first embodiment.

Third Embodiment The position where the generator 24 and the carburetor 71 are mounted can be changed as shown in FIG. FIG. 11 is a side view showing another embodiment. In FIG. 11, the same or equivalent members as those described with reference to FIGS. 1 to 9 are denoted by the same reference numerals, and detailed description is omitted. The electric assist bicycle 1 shown in FIG. 11 has the generator 24 arranged above the engine 25 and the carburetor 71 arranged below the engine 25. The engine 25 is mounted so that the cylinder axis is directed rearward and upward, as in the first and second embodiments, but is turned upside down so that the crankcase 25a is positioned upward. It may be mounted. By adopting this structure, the distance between the carburetor 71 and the cylinder head 69 is shortened, and the intake pipe 70 can be shortened. As shown in FIG. 11, the generator 24 and the carburetor 7
1 has the same effect as the first and second embodiments.

In the first to third embodiments, the example in which the present invention is applied to the electric assist bicycle which assists human power with the power of the motor 3 has been described. The present invention may be applied to an electric motorcycle capable of performing the following. That is, as shown in a cross-sectional view around the power unit 21 in FIG. 12, one end is supported by the bearing 33a, and the other end is connected to the bearing 33b via the output shaft 3a of the rear wheel drive motor 3 fitted with a clearance fit. The supported output bevel gear 40 is driven by the output shaft 3a, which is also connected and fitted in the rotational direction by a straight spline, and an accelerator grip is attached to the steering handle 7 so as to respond to a load required by the accelerator position. The output of the rear wheel drive motor 3 increases as the required load increases. The rear wheel drive motor 3 is directly supported at a lower portion of the saddle support portion 12. In FIG. 12, reference numeral 21a denotes a casing of the power unit 21, 21b denotes a bracket for mounting the casing 21a to the vehicle body frame 4 in a watertight state while supporting the bearing 33a and the oil seal 100, and 21c denotes a cover.

[0024]

As described above, according to the present invention, the engine and the generator 24 can be mounted by utilizing the dead space, and the fuel tank can be mounted without changing the position of other members. A light series hybrid electric motorcycle can be realized. According to the second aspect of the present invention, the power transmission device for transmitting the power of the engine to the generator can be formed so as to extend vertically in the side of the engine and the generator. Can be prevented from becoming longer in the front-rear direction, so that a more compact series hybrid electric motorcycle can be provided. Also, since the cylinder head of the engine is located near the fuel tank,
The fuel supply pipe connecting the carburetor and the fuel tank located between the engine and the fuel tank can be made short. Further, since the fuel in the fuel tank can be supplied to the vaporizer by gravity, a fuel pump is not required. According to the third aspect of the present invention, since heat can be prevented from being transmitted from the engine to the carburetor by the partition wall, the carburetor can be arranged close to the engine, and the auxiliary equipment is included. The entire engine can be made compact.

[Brief description of the drawings]

FIG. 1 is a side view of a series hybrid electric motorcycle according to the present invention.

FIG. 2 is an enlarged side view showing a main part.

FIG. 3 is a plan view of a power unit and a power transmission device for driving rear wheels.

FIG. 4 is a sectional view of the power unit taken along line IV-IV in FIG. 1;

FIG. 5 is a sectional view taken along line VV of a rear portion of the power transmission device in FIG. 1;

FIG. 6 is a front view of the shroud.

FIG. 7 is a rear view of the shroud.

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a block diagram schematically showing a configuration of an electric drive system.

FIG. 10 is a side view showing another embodiment using a chain-type rear wheel drive power transmission device.

FIG. 11 is a side view showing another embodiment.

FIG. 12 is a sectional view around a power unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric assist bicycle, 2 ... Rear wheel, 3 ... Motor, 4 ... Body frame, 10 ... Frame main body, 12 ... Saddle support part,
13 ... fender part, 18 ... pedal crankshaft, 24 ...
Motor, 25 engine, 26 fuel tank, 71 carburetor.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Masahiko Hirano 2500 Shinkai, Iwata-shi, Shizuoka Yamaha Motor F-term (reference) 5H115 PG10 PI16 PI22 PI29 PU01 PU24 PU26 TB01 TI02 TO04 TU12 UI28

Claims (3)

[Claims] 1. A hybrid electric two-wheeled vehicle that travels by supplying power generated by a generator driven by an engine and power of a battery to a wheel drive motor and transmitting the power of the motor to rear wheels. The rear portion of the vehicle body frame that rotatably supports a steering fork in the portion, the motor is supported below the saddle support portion that supports the saddle, and a fuel tank is disposed above the rear wheel, and the saddle support portion and A series hybrid electric motorcycle, wherein the engine and the generator are arranged below the fuel tank in a space between the rear wheel and the fuel tank so that they are arranged vertically. 2. The series hybrid electric motorcycle according to claim 1, wherein the engine is arranged at an upper rear portion of the frame body such that the axis of the crankshaft is oriented in the vehicle width direction and the cylinder axis is oriented rearward and upward of the vehicle body. The generator is arranged behind the frame body and below the engine so that the axis of the rotating shaft points in the vehicle width direction, and a carburetor is arranged between the engine and the fuel tank. A series hybrid electric motorcycle. 3. The series hybrid electric motorcycle according to claim 2, wherein a partition is provided between the engine and the carburetor.