JP2001106162A - Series hybrid type electric two wheeler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a series hybrid type electric two wheeler capable of cooling fully an engine and a generator with keeping its nimbleness. SOLUTION: A down frame part 11 that extends downward in rear from a head pipe is mounted on a bicycle body frame 4. A saddle supporting part 12 at a rear end part of the down frame part 11 for extending from a neighbor of a pedal crankshaft 18 to support a saddle 8 is mounted. Inside the down frame part 11 and the saddle supporting part 12, a running wind passage S adapted to guide a running wind from a piercing hole 17 (a running wind inlet) in front of the down frame part 11 to a running wind outlet of the saddle supporting part 12 is formed. The generator 24 and the engine 25 are placed in rear of the running wind outlet and between the saddle supporting part 12 and a 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 electric bicycles, there is an electric assisted bicycle that runs while assisting human power by 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 mount the engine and the generator on the body frame of the electric motorcycle, cooling of these heat generating members has been a problem. The body frame of an electric motorcycle is formed by arranging a plurality of frame members such as pipes in the front-rear direction of the vehicle body. It is because it becomes difficult to hit. Such inconvenience can be solved to some extent by mounting the engine or generator so as to protrude laterally from the body frame. However, when the engine and the generator are mounted as described above, the vehicle body becomes large, and the lightness of the electric motorcycle is impaired.

The present invention has been made to solve such a problem, and while maintaining the lightness of an electric motorcycle,
It is an object of the present invention to provide a series hybrid electric motorcycle that can reliably cool an engine and a generator.

[0005]

In order to achieve this object, a series hybrid electric motorcycle according to the present invention comprises a down frame portion extending rearward and downward from a head pipe in a body frame, and a rear end portion of the down frame portion. A traveling air passage is formed inside the saddle supporting portion extending upward from the front and supporting the saddle, and guiding a traveling wind from a traveling air inlet at a front portion of the down frame portion to a traveling air outlet of the saddle support portion. And a generator and an engine are arranged in a vertical direction between the saddle support portion and the rear wheel.

According to the present invention, the generator and the engine are mounted without using the dead space formed between the saddle support portion of the body frame and the rear wheel so that the generator and the engine do not protrude laterally. be able to. In addition, the traveling wind is blown to the generator and the engine through the traveling wind passage in the body frame, and these can be cooled by the traveling wind.

According to a second aspect of the present invention, there is provided a series hybrid electric motorcycle according to the first aspect, wherein a generator and an engine are housed in a shroud, and a traveling wind in the shroud is provided. An air inlet is formed at the front part facing the outlet, and an air outlet is formed at the rear part. According to the present invention, the space in the shroud constitutes the rear end of the traveling air passage in the vehicle body frame.

According to a third aspect of the present invention, there is provided a series hybrid electric motorcycle according to the first or second aspect, wherein a battery is provided in a traveling wind passage in the down frame portion. And a motor is disposed inside a connection portion between the down frame portion and the saddle support portion.
According to the present invention, the battery and the motor can be cooled by running wind having a relatively low temperature before cooling the generator and the engine.

[0009]

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 designates an electric assisted 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. This through hole 17 constitutes a traveling air inlet according to the present invention.

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 between the saddle support portion 12 and the rear wheel 2 for generating electric power for charging the battery 16 and electric power for supplying power to the motor 3 of the power unit 21. 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 controller 30 (see FIG. 9) for controlling the power of the motor 3, 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 on the housing 27 by bearings 32 to 34 (three), 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. In this embodiment, the motor 3 is disposed inside a connection portion between the down frame portion 11 and the saddle support portion 12 in the vehicle body frame 4.
The gear type power transmission device 28 is for transmitting the combined force of the human power and the power of the motor 3 to the rear wheel drive power transmission device 22, and is a planetary gear connected to the pedal crankshaft 18 via a one-way clutch 37. The gearbox 38, the ring gear 36, and the input bevel gear 39 of the rear wheel drive power transmission device 22
And an output bevel gear 40 that meshes with the gear. The planetary gear intensifier 38 is a sun gear in which a carrier 41 is connected to the one-way clutch 37 and a planetary gear 42 rotatably supported by the carrier 41 is rotatably supported by the pedal crankshaft 18. In addition to being engaged with the outer bevel gear 43, the outer peripheral gear 44 fixed to the output bevel gear 40 is also engaged. The ring gear 36 is fixed to the outer peripheral gear 44,
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. Further, the sun gear 43 has a structure in which an arm 45 for detecting human power is fixed, and a reaction force of human power is received by a spring member (not shown) elastically mounted between the arm 45 and the housing 27. I have. 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. In this embodiment, an outlet (running air outlet) of the running air passage S formed in the down frame portion 11 and the saddle supporting portion 12 is formed between the upper surface of the rear portion of the power unit 21 and the saddle supporting portion 12. A generator 24 and an engine 25 are disposed behind the traveling wind outlet.

As shown in FIG. 9, the generator 24 comprises a motor generator 64 and a motor generator controller 65. The generator 24 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. 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 vaporizer 71
A fuel supply pipe 73 through which fuel is supplied from the fuel tank 26 is connected to a portion disposed between the cylinder head 69 and the fuel tank 26 and facing the fuel tank 26.
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 of the carburetor 71 (FIG. 9)
) Employs a structure driven by an actuator (not shown). The actuator (throttle opening) is controlled by the integrated controller 15. The start of the engine 25 is performed by driving the crankshaft 68 by the motor generator 64, and the stop of the engine 25 is performed by the integrated controller 15 opening 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 1 configured as described above, the traveling wind flows into the down frame portion 4 from the through hole 17 of the down frame portion 11,
The air is discharged rearward from the air outlet 63 of the shroud 61 through the running air passage S in the down frame portion 11 and the saddle support portion 12 and the inside of the shroud 61. When the traveling wind passes through the inside of the shroud 61, the traveling wind is blown to the generator 24 and the engine 25, and these are cooled. Further, the saddle support portion 12 of the body frame 4 and the rear wheel 2
Generator 2 utilizing the dead space formed between
4 and the engine 25 can be mounted in a state where they do not protrude significantly to the side. Therefore, the generator 24
Despite the fact that the bicycle is equipped with the engine 25, the lightness of the bicycle can be maintained.
5 can be reliably cooled by the traveling wind.

The generator 24 and the engine 25 are housed in a shroud 61, and an air inlet 62 is formed at a front portion of the shroud 61 and an air outlet 63 is formed at a rear portion of the shroud 61. Constitutes the rear end of the traveling wind passage S in the vehicle body frame 4. Therefore, the traveling wind can be reliably blown to the generator 24 and the engine 25. Further, the down frame unit 11
Since the battery 16 is disposed in the traveling wind passage S inside the motor and the motor 3 is disposed inside the connection portion between the down frame portion 11 and the saddle support portion 12, the generator 24
The battery 16 and the motor 3 can be cooled by the relatively low-temperature running wind before the engine and the engine 25 are cooled.

Second Embodiment 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. Other parts of the body frame 4 have the same structure as that of the first embodiment.
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 positions 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 such that the cylinder axis is directed rearward and upward, as in the case of the first and second embodiments. As shown in FIG.
Even if the vaporizer 71 is mounted, the same effect as when the first and second embodiments are adopted can be obtained.

Fourth Embodiment When the generator 24 is disposed above the engine 25,
As shown in FIG. 12, the engine 25 can be mounted so that the vertical direction is opposite. FIG. 12 is a side view showing another embodiment in which the engine is mounted in an inverted state. In FIG. 12, the same or equivalent members as those described with reference to FIGS. Description is omitted. The engine 25 shown in FIG. 12 is mounted on the shroud 61 such that the crankcase 25a is located at the top. By adopting this structure, the cylinder head 69 where the temperature of the engine 25 becomes the highest is located near the air inlet 62, and the engine 25 can be cooled efficiently. Further, the distance between the carburetor 71 and the cylinder head 69 is reduced, and the intake pipe 70 can be shortened.

In the electric assist bicycles of the first to fourth embodiments, each device may be controlled by the integrated controller 15 as follows. The main switch is turned on, the passenger applies a pedaling force to the pedal 36, the electric assisted bicycle starts running, and the vehicle speed is 5 km / h.
, The motor generator 64 starts the engine 25. While the engine speed is maintained at 5 km / h or more after startup, the engine 25 generates power in accordance with the vehicle speed and the remaining capacity of the battery 66 to drive the motor generator 64, and the power generated by the motor generator 64. Is supplied to the battery 66.
When the main switch is in the ON state, the motor 3 generates rotational power in accordance with two parameters, a pedaling force on the pedal 36 and a vehicle speed. That is, when a pedaling force equal to or greater than a predetermined value is applied, such as at the start of running or during acceleration, a power corresponding to the pedaling force (in direct proportion) is generated (acceleration running mode), while a region where the pedaling force is equal to or smaller than the predetermined value (the pedal 36 is stopped). In this case, the vehicle speed is detected and feedback control of the motor 3 is performed so as to maintain the vehicle speed immediately before the pedaling force becomes equal to or less than the predetermined value (steady running mode). The motor 3 drives the rear wheels 2 with power corresponding to running resistance such as wind resistance and friction resistance that weaken inertia.

The steady running mode and the accelerated running mode are released while a brake (not shown) is operated, and the mode is set to the decelerated running mode. That is, when the brake operation force is equal to or more than the predetermined value, the motor 3 generates a regenerative current to charge the battery 66. This enables rapid deceleration.
When the brake operation force is equal to or less than the predetermined value, the motor 3 does not generate a rotational force or generate a regenerative current. This enables slow deceleration. When the brake operation is released, the pedal 36
The acceleration traveling mode or the steady traveling mode is performed according to the pedaling force on the vehicle. The vehicle speed is 5k by the brake operation.
m / h or less, the engine 25 is stopped due to misfire or the like, and if the vehicle speed becomes 0 before the brake is released,
After the brake is released, the motor 3 does not generate a rotating force until the pedaling force is applied again to the pedal 36, and the electric assist bicycle remains stopped.

In the first to fourth embodiments, an example has been shown in which the present invention is applied to an electric assisted bicycle that assists human power with the power of a motor 3. However, the present invention is directed to running using only the power of a motor. 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. 13, one end is supported by the bearing 33a, and the other end is supported by 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. 13, 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.

[0029]

As described above, according to the present invention, the generator and the engine can be made compact by utilizing the dead space formed between the saddle support portion of the body frame and the rear wheel. The generator and the engine can be cooled by the traveling wind guided by the traveling wind passage in the body frame. Therefore, while maintaining the lightness of the bicycle,
A series hybrid electric motorcycle that can reliably cool the generator and the engine can be provided. According to the second aspect of the present invention, since the space inside the shroud constitutes the rear end of the traveling wind passage, the traveling wind can be reliably blown to the generator and the engine. Claim 3
According to the described invention, the battery and the motor can be cooled by the traveling wind having a relatively low temperature before the generator and the engine are cooled. The battery and the motor can be prevented from being heated.

[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 side view showing another embodiment in which the engine is mounted in an inverted state.

FIG. 13 is a sectional view around a power unit.

[Explanation of symbols]

1: electric assist bicycle, 3: motor, 4: body frame,
10 ... frame body, 11 ... down frame part, 12 ...
Saddle support part, 16: battery, 17: through hole, 21
... power unit, 24 ... generator, 25 ... engine, 61
... shroud, 62 ... air inlet, 63 ... air outlet, S ...
Running wind passage.

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. A down frame portion extending backward from the head pipe in the frame,
Inside the saddle support that extends upward from the rear end of the down frame and supports the saddle, a traveling air passage that guides the traveling wind from the traveling air inlet at the front of the down frame to the traveling air outlet of the saddle support. A series hybrid electric motor, wherein the generator and the engine are arranged behind the traveling wind outlet and between the saddle support portion and the rear wheel so that they are arranged vertically. Motorcycle. 2. The series hybrid electric motorcycle according to claim 1, wherein the generator and the engine are housed in a shroud, and an air inlet is formed at a front portion of the shroud facing a traveling wind outlet, and an air outlet is formed at a rear portion. A series hybrid electric motorcycle characterized by the formation of: 3. The series hybrid electric motorcycle according to claim 1, wherein a battery is disposed in a traveling air passage in the down frame portion, and a battery is provided inside a connection portion between the down frame portion and the saddle support portion. A series hybrid electric motorcycle characterized by a motor.