JP2003127940A - Frame structure for electric motor bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frame structure for an electric motor bicycle not blocking a rider's foot space and not impairing ease of getting on and of and to protect the battery from an external force. SOLUTION: In the electric motor bicycle 1 traveling with driving force of an electric motor operating with a battery 32 as a power source, the battery 32 is arranged below the seat 15 and a structure putting the battery 32 between a left and right pair of rising parts of a vehicle body frame 14. Since the battery 32 is arranged below the seat 15, the rider's foot space is not blocked and ease of getting on and off are not impaired by the battery 32. Since the battery 32 is put between the left and right pair of rising parts of the vehicle frame 14, the same is effectively protected from external force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure of an electric two-wheeled vehicle that travels using an electric motor as a drive source.

[0002]

2. Description of the Related Art Conventionally, most of motorcycles have an engine as a drive source, but an electric motorcycle that uses an electric motor as a drive source has been developed from the viewpoint of environmental protection and the like.

[0003]

A rechargeable battery is indispensable for such an electric motorcycle, but the battery does not obstruct the foot space of the rider.
In addition, it should be placed in a place that does not interfere with getting on and off the vehicle, in a form that is protected against external force.

The present invention has been made based on the above viewpoint, and an object thereof is an electric two-wheeled vehicle in which the battery does not hinder the rider's foot space and getting on and off, and the battery can be protected from external force. To provide the frame structure of.

[0005]

In order to achieve the above object, the invention according to claim 1 is an electric two-wheeled vehicle which is driven by a driving force of an electric motor which operates using a battery as a power source, wherein the battery is arranged below a seat. In addition, a configuration is adopted in which the left and right sides of the battery are sandwiched by a pair of left and right body frame rising portions.

According to a second aspect of the present invention, in the first aspect of the invention, the seats are mounted on the pair of left and right body frames so that the seats can be opened and closed, and the seats are provided between the rising portions of the left and right body frames below the seats. The battery is arranged so that it can be detached.

Therefore, according to the invention of claim 1, since the battery is arranged below the seat, the foot space of the rider is not obstructed by the battery.
A sufficient foot space is secured, and the rider's entry / exitability is not hindered by the battery. Further, since the left and right sides of the battery are sandwiched by the rising portions of the pair of left and right body frames, the battery is effectively protected against external force.

According to the second aspect of the present invention, the seat is attached to the pair of left and right body frames so as to be openable and closable, and the battery is detachably arranged between the rising portions of the left and right body frames below the seat. With the seat open, the battery can be easily attached / detached in a comfortable posture, and the operability of attaching / detaching the battery to / from the vehicle body is enhanced.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side view of an electric motorcycle according to the present invention,
FIG. 2 is a cutaway side view of the rear portion of the electric motorcycle showing the state when the battery is attached and detached, and FIG. 3 is a partial plan view of the electric motorcycle with the battery seat removed.

The electric motorcycle 1 shown in FIG. 1 is provided with a head pipe 2 in the upper front part of the vehicle body, and a steering shaft (not shown) is rotatably inserted in the head pipe 2. An upper bracket 3 is attached to the upper end of the steering shaft, and an under bracket 4 is attached to the lower end of the steering shaft.
Is attached. Grips 6 are attached to both ends of the handle 5, and a brake lever 7 is provided in the vicinity of the left grip 6 so that the grip 6 on the right side (the back side in FIG. 1) not shown rotates. It constitutes a possible throttle grip.

An upper portion of a front fork 8 is attached to the upper bracket 3 and the under bracket 4, and a front wheel 9 is rotatably supported by a front axle 10 at the lower end of the front fork 8. A meter 11 is arranged on the upper bracket 3 in front of the handle 5, a head lamp 12 fixed to an upper part of the front fork 8 is arranged below the meter 11, and both sides of the head lamp 12 are arranged. Flasher lamps 13 (only one of which is shown in FIG. 1) are provided.

On the other hand, the side view U is seen from the head pipe 2.
A pair of left and right body frames 14 each having a character shape are provided extending toward the rear of the vehicle body. That is, the round pipe-shaped vehicle body frame 14 extends obliquely downward from the head pipe 2 toward the rear of the vehicle, is bent rearward in an arc shape and extends substantially horizontally to the rear of the vehicle, and then extends upward. Is bent into an arc shape and rises obliquely upward toward the rear of the vehicle body to form a U-shape in a side view. And the body frame 1
The rear end portion 14a of No. 4 is bent along the shape of the seat 15, and the left and right rear end portions 14a form one continuous pipe.

By the way, in the vicinity of the rear portions of the left and right body frames 14, a seat stay 16 having an inverted U-shape (see FIG. 3).
Is welded to the front of the vehicle body obliquely upward, and the seat 15 is openably and closably disposed in a portion surrounded by the seat stay 16 and the left and right vehicle body frames 14. That is, as shown in FIG. 2, the hinge 17 is provided on the horizontal portion of the front end of the seat stay 16 by the hinge 17.
A front end of the seat 5 is supported rotatably up and down, and a cushion member 18 is attached to the lower surface of the bottom plate 15a of the seat 15.

A seat stay 19 for supporting the seat 15 and a lock mechanism (not shown) for fixedly locking the seat 15 in a closed state are provided on the vehicle body frame 14 side. A tail lamp 21 is attached to the rear surface of the rear fender 20 attached to the rear end of the vehicle body frame 14, and the flasher lamp 2 is attached to the left and right of the tail lamp 21.
2 (only one is shown in FIGS. 1 and 2).

On the other hand, the seats 1 of the left and right body frames 14
5. Rear arm brackets 23 (only one of which is shown in FIGS. 1 and 2) are welded to the lower bent portions, respectively.
A front end of a rear arm 24 is supported by a pair of left and right rear arm brackets 23 by a pivot shaft 25 so as to be vertically swingable. A rear wheel 26, which is a drive wheel, is rotatably supported at the rear end of the rear arm 24, and the rear arm 24 and the rear wheel 26 are suspended on the vehicle body frame 14 by a rear cushion 27.

A foot step 28 is provided on the horizontal portion of the left and right body frames 14 (only one of which is shown in FIGS. 1 and 2).
Are attached respectively, and the left body frame 1
Side stand 29 behind the 4th foot step 28
Is rotatably supported by a shaft 30, and the side stand 29 is biased toward the closing side by a return spring 31.

By the way, in the electric motorcycle 1 according to the present embodiment, the battery 32 is detachably arranged between the rising portions of the left and right body frames 14 below the seat 15. The battery 32 is configured to accommodate a plurality of rechargeable secondary batteries, and a tiltable handle 33 is provided on the upper surface thereof (see FIGS. 2 and 3). Further, as shown in FIG. 3, a guide groove formed by the left and right ribs 32a continuously formed in the vertical direction is provided on the rear surface of the battery 32 in the vertical direction.

On the other hand, as shown in FIGS. 1 and 2, a cup-shaped case 34 having an open top is attached between the left and right body frames 14 below the seat 15, and the case 34 is attached to the case 34. The lower portion of the battery 32 is partially attached. As shown in FIG. 2, a discharge terminal 35 is provided upright in the case 34. When the battery 32 is housed in the case 34 as shown in FIG.
A discharge terminal (not shown) buried in the bottom surface of the second battery 2 is connected to the discharge terminal 35 on the case 34 side.

As shown in FIG. 2, a plate-shaped guide member 36, which is wide in the vehicle width direction, is erected obliquely upward toward the rear of the vehicle body at the rear portion of the case 34. Is supported by a bracket 37 fixed to the vehicle body frame 14 side. The guide member 3
The upper end of 6 is bent in an arc shape toward the rear of the vehicle body to form an introducing portion 36a (see FIG. 2).

Next, the structure of the electric power unit for driving the rear wheels 26 will be described with reference to FIGS. Incidentally, FIG.
Is a left side view of the rear wheel portion of the electric motorcycle, and FIG. 5 is A- in FIG.
A sectional view taken along the line A, FIG. 6 is a view taken along the line BB of FIG. 5, and FIG.
9 is a sectional view taken along the line CC of FIG. 8, FIG. 8 is a sectional view taken along the line DD of FIG.
FIG. 3 is a side view showing a configuration of a drive system of a rear brake.

As shown in FIG. 5, the gear cover 3 is provided on the right end surface of the rear end portion 24 of the rear arm 24, which has a substantially circular shape.
8 is attached, and an electric motor 39, a planetary gear speed reducer 40, and a controller 41, which form an electric power unit, are integrally incorporated in a space formed therein.

The electric motor 39 as a drive source is of an axial gap type that is flat in the vehicle width direction. As shown in FIG. 5, the electric motor 39 is supported at the rear end of the rear arm 24. The rotor 39A is fixed to the rotary shaft 42, and the stator 39B is fixed to the inner surface of the rear arm rear end portion 24a so as to face the rotor 39A.

Here, the rotary shaft 42 is arranged in the vehicle width direction, and the base end portion of the rotary shaft 42 is supported by a bearing 43.
4 is rotatably supported by a rear end portion 24a of the rotor 39, and the rotor 39A is fixed to a yoke 39a whose center portion is connected to a rotating shaft 42 and an outer peripheral surface of the yoke 39a facing the stator 39B. And a magnet 39b that is formed.

In the stator 39B, the plurality of coils 39c are connected to the rotary shaft 4 on the inner surface of the rear end portion 24a of the rear arm 24.
2, the coils 39c are formed in a C-shape open toward the front of the vehicle body (right side in FIG. 6) in a side view, as shown in FIG. They are arranged side by side, and a part of the controller 41 faces the open part.

On the other hand, the planetary gear reducer 40 is incorporated in a recess formed in the central portion of the yoke 39a of the rotor 39A, and this has a small-diameter sun gear 42a integrally formed with the rotary shaft 42. A large-diameter ring gear 44 and a sun gear 42 arranged concentrically with the sun gear 42a.
a and three planetary gears 45 meshing with the ring gear 44 are included.

By the way, the planet gear 45 has a pin 46.
Is rotatably supported by the carrier 47, and each planet gear 45 rotates about the pin 46, revolves around the sun gear 42a, and transmits the rotation to the carrier 47 via the pin 46.

Here, a part of the carrier 47 constitutes a rear axle 47a arranged coaxially with the rotating shaft 42, and the entire carrier 47 including the rear axle 47a is provided with a pair of bearings 48 by the gear cover 38. It is rotatably supported by.

The ring gear 44 is rotatably supported, and a known one-way clutch 49 is provided on the outer peripheral portion of the ring gear 44. The one-way clutch 49
Is to allow rotation transmission from the electric motor 39 in the direction of the rear wheel 26 and block rotation transmission in the opposite direction.

On the other hand, the gear cover 38 of the rear axle 47a.
The rear wheel 26 is spline-fitted and connected to the outer end by a nut 50, and is integrally formed on the inner surface of the wheel 51 of the rear wheel 26, as shown in FIG. A drum-type rear brake 52 is incorporated inside the drum portion 51a.

The rear brake 52 is, as shown in FIG. 7, a brake lining 53 fixed to the inner periphery of the drum portion 51a of the wheel 51 of the rear wheel 26, and two brake linings disposed inside the brake lining 53. A half-moon shaped brake shoe 54 is provided. One ends of the two brake shoes 54 are rotatably connected by a support pin 55, and an operating cam 56 is provided between the other ends. The two brake shoes 54 are closed by two return springs 57 stretched over them (the brake non-operating side).
Is urged by. The support pin 55 is supported by the gear cover 38 via a boss 58, as shown in FIG.

By the way, as shown in FIG. 8, the shaft portion 56a of the actuating cam 56 is rotatably supported by a boss 59 fixedly inserted through the gear cover 38, and the gear cover 38 of the shaft portion 56a is supported. One end facing the inner space (left end)
As shown in FIG. 9, a sector sector gear 60 having a sector shape is attached to the.

On the other hand, the bracket 24b (see FIGS. 7 and 8) formed integrally with the lower portion of the rear arm 24 has a shaft 6
1 is rotatably inserted and supported, and at one end (left end) of the space of the shaft 61 facing the space inside the gear cover 38, as shown in FIG. 7 and FIG. And a lever 63 is attached to the other end (right end) of the shaft 61 protruding outside the rear arm 24. The lever 63 is provided on the return spring 6
4 is urged in one direction (brake non-operating direction) and is connected to the brake lever 7 (see FIG. 1) via a brake wire 65 shown in FIG. As shown in FIG. 8, the sector gear 62 is formed by bending at a right angle to avoid interference with the rotor 39A of the electric motor 39.

The controller 41 controls the electric motor 39. The electric motor 39 and the electric motor 39 are electrically connected by an electrode plate 66 shown in FIG. 6, and the controller 41 and the battery are connected. 32 and the throttle grip (not shown) are electrically connected by a covered wire 67 shown in FIG.

In the electric bicycle 1, when the electric motor 39 is rotationally driven by the electric power supplied from the battery 32, the rotation is reduced by the planetary gear reducer 40 and transmitted to the rear axle 47a. Then, the rear axle 47a and the rear wheel 26 attached to the rear axle 47a are rotationally driven, and the electric motorcycle 1 is caused to travel at a predetermined speed. When the rider rotates a throttle grip (not shown) provided on the handle 5 to accelerate or decelerate the vehicle while the electric motorcycle 1 is traveling, the operation signal is transmitted to the controller 41 to rotate the electric motor 39 and the rear wheel 26. The rotation is controlled and the vehicle speed of the electric motorcycle 1 is accelerated or decelerated.

When the rider rotates the brake lever 7 shown in FIG. 1 to perform a braking operation, the brake wire 65 shown in FIG. 4 is pulled to rotate the lever 63, which is rotated by the shaft 61 and the sector gear 62. , 60 to be transmitted to the operating cam 56, and the operating cam 56 rotates. Then, the brake shoe 54 of the rear brake 52 is pushed open by the actuating cam 56, and the brake shoe 54 rotates around the support pin 55 against the urging force of the return spring 57 and spreads out, and the brake lining. It is pressed against the inner peripheral surface of 53. As a result, a frictional force is generated between the brake shoe 54 and the brake lining 53, and the frictional force exerts a required braking force on the rotation of the rear wheel 26, so that the electric motorcycle 1 is decelerated or stopped.

By the way, when the battery 32 is charged because the voltage of the battery 32 has dropped due to use, the battery 32 is removed from the vehicle body. The battery 32 is removed in the following manner.

That is, the seat 1 by a lock mechanism (not shown)
After releasing the lock of No. 5, when the seat 15 is rotated about the hinge 17 as shown in FIG.
The upper part of the battery 32 is opened.

Next, in the above state, the handle 33 provided on the upper portion of the battery 32 is raised and gripped,
By pulling the battery 32 upward along the guide member 36, the battery 32 can be easily removed, and the removed battery 32 can be charged.

Thereafter, when the battery 32 is charged and the battery 32 is mounted again, the battery 32 is slid downward along the guide member 36 in the state shown in FIG. It may be partially attached to the case 34. That is, when the rear surface of the battery 32 is brought into contact with the introduction portion 36a at the upper end of the guide member 36 and the battery 32 is pushed down along the guide member 36, the guide groove penetrating the rear end surface of the battery 32 is fitted into the guide member 36. In order to fit the battery 32, the battery 32 is smoothly slid and mounted while being guided by the guide member 36.
The discharge terminal (not shown) embedded in the bottom surface of the battery is connected to the discharge terminal 35 on the case 34 side, and the battery 32 can be used.

When the battery 32 is mounted as described above, the seat 15 is rotated about the hinge 17 and is closed as shown in FIG.
The closed state of 5 is locked by the lock mechanism, and the cushion material 18 attached to the bottom plate 15a of the seat 15 presses the upper surface of the battery 32 to securely hold the battery 32.

As described above, in the present embodiment,
Since the battery 32 is arranged below the seat 15, the foot space of the rider is not obstructed by the battery 32, a sufficient foot space is secured, and the rider's entry / exitability is not obstructed by the battery 32 either.

Since the left and right sides of the battery 32 are sandwiched by the pair of left and right body frames 14, the battery 32 is effectively protected against external force, and its damage is prevented.

Further, in this embodiment, the seat 15 is mounted on the pair of left and right body frames 14 so as to be openable and closable, and the battery 32 is detachably arranged between the rising portions of the left and right body frames 14 below the seat 15. Therefore, the rider can open and close the seat 15 to easily attach / detach the battery 32 in a comfortable posture, and the operability of attaching / detaching the battery 32 to / from the vehicle body can be improved. The battery 32 can be easily detached from the vehicle body for charging. You can

In the above embodiment, the battery 32 is used.
The guide member 36 for guiding the guides is erected upward from the rear end of the case 34, but as shown in FIG. In addition to the same effects as described above, the battery 32
It is possible to reduce the size of the surroundings of the vehicle body in the front-rear direction to make the portion compact.

[0046]

As is apparent from the above description, according to the present invention, in an electric motorcycle that is driven by the driving force of an electric motor that operates using a battery as a power source, the battery is arranged below the seat, and Since the configuration in which the left and right sides of the battery are sandwiched by the rising portions of the pair of left and right body frames is adopted, it is possible to obtain an effect that the foot space of the rider and the ability to get on and off the vehicle are not hindered, and the battery can be protected from external force.

[Brief description of drawings]

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

FIG. 2 is a cutaway side view of a rear portion of the electric motorcycle showing a state when the battery is attached and detached.

FIG. 3 is a partial plan view of the electric motorcycle according to the present invention with the seat of the battery portion removed.

FIG. 4 is a left side view of a rear wheel portion of the electric motorcycle according to the present invention.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a view taken along the line BB of FIG.

FIG. 7 is a view taken along the line CC of FIG.

8 is a cross-sectional view taken along the line DD of FIG.

FIG. 9 is a side view showing a configuration of a rear brake drive system of the electric motorcycle according to the present invention.

FIG. 10 is a cutaway side view of a rear portion of an electric motorcycle according to another embodiment of the present invention.

[Explanation of symbols]

1 electric motorcycle 14 Body frame 15 sheets 32 batteries 39 Electric motor

Claims (2)

[Claims] 1. An electric two-wheeled vehicle that is driven by a driving force of an electric motor that operates using a battery as a power source, wherein the battery is arranged below a seat, and the left and right of the battery are sandwiched between a pair of left and right body frame rising portions. The frame structure of the electric motorcycle is characterized by adopting. 2. The seat is attached to the pair of left and right body frames so as to be openable and closable, and the battery is detachably arranged between the rising portions of the left and right body frames below the seat. The frame structure of the electric motorcycle according to 1.