JPH05116665A - Motor-driven two wheeler - Google Patents

Abstract

PURPOSE:To improve the strength of a frame and the storage of parts by devising such a means as to dispose two upper pipe materials forming a main frame at the outermost edge of foot step parts and to dispose two lower pipe materials at the lower corners of an inverted trapezoid with a banking angle taken into account. CONSTITUTION:In pipe material forming the main frame of a motor-driven two wheeler, two upper pipe materials 1a in the cross section of foot step parts 18 are disposed on the outermost edge of the foot step parts 18, and two lower pipe materials 1b are disposed at the lower corner parts of an inverted trapezoid with a banking angle theta taken into account. A battery 2 is mounted to the inner center part of two lower pipe materials 1b. A power element 3 for controlling a motor, a power element 4 for switching a battery charger, electronic parts such as a DC/CD converter 5 are disposed within the banking angle theta of the inverted trapezoid connecting the upper and lower pipe materials 1a, 1b to each other. The control circuit 10 of the respective power elements 3, 4 is installed in a space 11 below a seat 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric two-wheeled vehicle (electric scooter) which travels using a motor driven by a battery mounted therein as a power source.

[0002]

2. Description of the Related Art Conventionally, an electric motorcycle is disclosed in, for example, Japanese Patent Laid-Open No. 2-1.
It is disclosed in Japanese Patent No. 82590 and others and belongs to the publicly known, and recently, practical vehicles are also available. A grip accelerator device for an electric two-wheeled vehicle is also known, for example, disclosed in Japanese Utility Model Laid-Open No. 3-50905.

[0003]

[Problems to be Solved by the Present Invention]

(1) For electric motorcycles, it has been researched to mount as many heavy and bulky batteries as possible on the bottom of the main frame, and the structure of the main frame has been devised so that it is durable and considers the storage space for batteries and other devices. Has been done. Regarding the structure of the main frame, it is also necessary to consider the maximum angle (bank angle) at which the vehicle body leans inward when the electric motorcycle (electric scooter) turns. However, the main frame of the electric two-wheeled vehicle described in Japanese Patent Laid-Open No. 2-182590 described above does not have a structure that takes the bank angle into consideration (see FIG. 2B of the same publication). Also, it is necessary to protect precision parts and electronic parts that may be damaged when they fall by using a sturdy main frame to prevent damage.

(2) In the case of an electric scooter, functional parts are efficiently arranged in a narrow space below the foot step,
It is important to make effective use of space. In this case, it is also necessary to enhance the heat radiation effect for removing the heat generation of the functional component. (3) Since the power cable that connects the battery and the drive motor is thick and heavy, it is important to keep it as short as possible and also reduce the electrical resistance.

(4) The control circuit that gives a switching signal to the power element is a component that generates little heat but is sensitive to external influences, and is installed by selecting a location that is reliably shielded from water and dust. It is essential. (5) As disclosed in Japanese Utility Model Laid-Open No. 3-50905 mentioned above, in the case of a grip accelerator device in which a small potentiometer is installed in the accelerator grip of the handle, the potentiometer must be installed because it is installed in a thin handle pipe. There was a problem in that it was unavoidable to choose a small-sized one with poor durability, and as a result, it was prone to failure. There is also a problem that noise (disturbance) easily enters the signal line connecting the potentiometer and the control circuit, which may cause malfunction.

[0006]

As a means for solving the above-mentioned problems of the prior art, an electric two-wheeled vehicle according to the present invention is an electric two-wheeled vehicle as shown in FIGS. 1 to 3. In the pipe material constituting the main frame, the upper two pipe materials 1a, 1a in the cross section of the foot step portion 18 are arranged at the outermost edge positions of the foot step portion 18, and the lower two pipe materials 1b are arranged. , 1b are arranged at the lower corner positions of the inverted trapezoid in consideration of the bank angle θ. A battery 2 is mounted in the center of the inner side of the lower two pipe members 1b and 1b, and the motor 2 is mounted on both sides of the battery 2 within an inverted trapezoidal bank angle θ connecting the upper and lower pipe members 1a and 1b. A control circuit 10 for arranging electronic components such as a power element 3, a switching power element 4 of a charger, a DC / DC converter 5 and the like, and controlling the power elements 3, 4.
Is installed in a space (luggage compartment 11) under the seat 12 that can be opened and closed.

The electric motorcycle according to the present invention includes a power element 3 for controlling a motor and a power element 4 for switching a charger.
Are installed on the upper surface of a heat sink 6 having a long and downward heat dissipation fin 6a in a direction parallel to the traveling direction of the electric motorcycle, and the heat dissipation fin 6a of the heat sink 6 is exposed on the lower surface of the foot step 18. It is also characterized by being.

In a second aspect of the present invention, in an electric two-wheeled vehicle, a motor 16 as a traveling power source is provided at a position of a half of one side of a main frame of the two-wheeled vehicle near a rear wheel (driving wheel) 19. The motor 16 is installed, and is connected to the drive wheels 19 via a continuously variable transmission 17 using a belt installed on the other half of the other side. A power element 3 for motor control is installed below the foot step portion 18 on the same side as the position of the motor 16, and a power control wire 8 for connecting the power element 3 and the motor 16 is provided at an intermediate position for motor control. A current sensor 9 is installed.

In a third aspect of the present invention, in an electric two-wheeled vehicle, an accelerator sensor such as a potentiometer 14 for detecting the opening of a throttle grip 13 has a seat 12 close to a control circuit 10 which sends a signal to a power element 3 of a motor 16. The accelerator sensor 14 and the throttle grip 13 are installed in a space (baggage compartment 11) below and are connected by a flexible wire 15.

[0010]

[Operation] Lower part of the main frame (foot step portion 18
The cross-section of the part) is composed of four pipe members 1a, 1a and 1b, 1b located at the four corners of the inverted trapezoid (Fig. 3),
Large section modulus. Therefore, it exhibits strength and rigidity suitable for mounting the heavy and bulky battery 2, and forms a storage space for the functional component. Even if this electric two-wheeled vehicle falls over, the electronic parts etc. arranged inside this main frame will
It is protected by the strong pipe materials 1a and 1b to prevent breakage. When the electric two-wheeled vehicle travels and turns, the maximum angle (bank angle θ) at which the vehicle body largely tilts inward is sufficiently secured, and the steerability is good.

The storage space under the foot step portion 18 serves as a partition wall by separating the room in which the power elements 3 and 4 are installed from the outside air by the heat sink 6. As a result, since the power elements 3 and 4 are not exposed to the outside, they are not exposed to muddy water. The heat generated by the power elements 3 and 4 is effectively removed through the heat sink 6. A large heat sink 6 that is long in the traveling direction of the two-wheeled vehicle can be installed in the storage space below the foot step portion 18. When the electric motorcycle is running, the outside air easily flows along the heat radiation fins 6a,
There is little resistance. Since the heat radiation fins 6a are in direct contact with the outside air, the heat radiation effect is good. The heat sink 6 is located on the lower surface of the body cowl 7 in which the foot step portion 18 is formed and is not exposed to direct sunlight, so that temperature rise due to sunlight can be avoided.

Since the motor 16 and the power element 3 for controlling the motor are arranged close to each other, the length of the thick and heavy power cable 8 connecting them is shortened, the weight thereof is reduced, and the electric resistance is reduced. To be done. The control circuit 10, which is delicate against external influences, is installed in the space under the seat 12 (the luggage compartment 11), so that it is reliably shielded from water and dust and protected.

A potentiometer (accelerator sensor) 14 for detecting the opening of the throttle grip 13 is installed in a wide space (luggage compartment 11) under the seat 12 and has a sufficient space so that it is sufficiently large and durable. You can use excellent ones. Further, since the potentiometer 14 and the control circuit 10 are arranged close to each other and the signal line connecting them is short, it is difficult for noise to be mixed.

[0014]

EXAMPLE An example of the present invention shown in the drawings will be described below.
The main frame of the electric motorcycle (electric scooter) shown in FIGS. 1 to 3 is composed of a set of several steel pipe materials. In particular, the main frame of the portion along the foot step portion 18 formed by the cowling 7 has the upper two pipe materials 1a, 1a at the outermost edge position of the foot step portion 18 as shown in the cross section in FIG. The lower two pipe members 1b, 1b are arranged at a position slightly inward of the line of the bank angle θ (the lower corner position of the inverted trapezoid), and a total of four pipe members 1a, 1a and 1b, 1b. The cross section has a large cross-section coefficient, makes it easy to store the battery 2, and is suitable for supporting the weight of the battery 2. A battery pedestal (not shown) is installed inside the lower two pipe members 1b and 1b, and as many batteries 2 as possible are mounted thereon.

In the main frame having the above structure, the motor 16 as a traveling power source of the electric two-wheeled vehicle is installed at a position close to the rear drive wheel (rear wheel) 19 and at a position biased to one half on one side. There is. The output shaft of the motor 16 is directly connected to the continuously variable transmission 17 using a belt installed in a portion that is biased to the other side approximately half, and is connected to the drive wheels 19 by the belt of the continuously variable transmission 17 described above. In the figure, 17a is a belt storage case.

Foot step portion 1 of the main frame
8, a space formed in the lower part, that is, the inside of the four pipe members 1a, 1a and 1b, 1b arranged in the inverted trapezoidal shape, which is located on one side of the battery 2, in particular, the same as the motor 16. On the side, three power elements (switching elements such as transistors) 3 for motor control are arranged side by side in the front-rear direction. The power element 3 and the motor 16 are connected to each other by the shortest power wire 8 in the shortest distance, so that the weight of the wire and the electrical resistance are reduced. Each power element 3 is connected to the battery 2. A current sensor 9 using an electromagnetic induction type Hall element is installed in the middle of the power wire 8 from the power element 3 to the motor 16 for motor control. The three power elements 3 are arranged side by side on the upper surface of a relatively large heat sink 6 having long and downward heat radiation fins 6a in a direction parallel to the traveling direction of the electric motorcycle (front-back direction) ( (Fig. 2). Therefore, the heat sink 6 serves as a partition wall that separates the room in which the power element 3 is installed from the outside air, and the power element 3 has its upper surface covered with the body cowl 7.
It is not exposed to muddy water and is not polluted. The heat radiation fins 6 a of the heat sink 6 are exposed on the lower surface of the foot step 18. Although the radiating fins 6a of the heat sink 6 are in direct contact with the outside air, because of the lower surface of the body, the direct sunlight is blocked by the body cowl 7 and does not hit directly, so that the temperature rise due to the direct sunlight can be avoided. The outside air easily flows along the heat dissipation fins 6a of the heat sink 6 that are in direct contact with the outside air, and a high heat dissipation effect is exhibited. Therefore, the power element 3 that controls a large current and generates heat is installed in a place with good heat dissipation.

Similarly, a space formed along the foot step portion 18 of the main frame,
At a position opposite to the place where the power element 3 is installed, with the battery 2 in between, a power element 4 for switching the charger.
Are installed side by side in the front-back direction (Fig. 2). The three power elements 4 are also arranged side by side on the upper surface of a relatively large heat sink 6 having long and downward heat radiation fins 6a in a direction (front-back direction) parallel to the traveling direction of the electric motorcycle. Therefore, the heat sink 6 is the power element 4
It plays the role of a partition wall that separates the room in which is installed from the outside air, and since the power element 4 is covered by the body cowl 7, it is not exposed to muddy water and is not polluted. The heat radiation fins 6 a of the heat sink 6 are exposed on the lower surface of the foot step portion 18. Although the radiating fins 6a on the upper surface of the heat sink 6 are in direct contact with the outside air, since they are located on the lower surface of the body, the direct sunlight is blocked by the body cowl 7 and is not directly hit, so that the temperature rise due to the direct sunlight is avoided. The outside air easily flows along the heat dissipation fins 6a of the heat sink 6 that are in direct contact with the outside air, and a high heat dissipation effect is exhibited. Therefore, the power element 4 that controls a large current and generates heat is installed in a place with good heat dissipation.

Similarly, in the lower space along the foot step portion 18 of the main frame, slightly rearward of the place where the power element 4 is installed, the 48 volt voltage generated by the four batteries 2 is 12 volt. A DC / DC converter 5 for converting into an auxiliary device voltage is installed. In short, each functional component (electronic component) is efficiently arranged in the narrow space below the foot step portion 18 to effectively utilize the space. The electronic components that may be damaged during a fall are located inside the durable main frame and are protected.

Next, the control circuit 10 for giving a switching signal to the above-mentioned power element 3 for controlling the motor can be opened and closed and is a space under the seat 12 that can be locked (locked). It is installed in a close position. Therefore, the control circuit 10, which is a delicate component that does not generate heat, is sufficiently protected from water and dust. Also in the luggage compartment 11 and in the control circuit 1
A potentiometer 14 (accelerator sensor) for detecting the opening degree of the throttle grip 13 provided on one side of the steering wheel is installed at a position close to 0, and a thin signal line for transmitting the output of the potentiometer 14 is controlled by a configuration as short as possible. It is connected to the circuit 10. Therefore, noise mixed in the signal line is eliminated, and malfunction is prevented. The potentiometer 14 and the throttle grip 13 of the steering wheel are connected by a flexible wire (operating wire) 15. Therefore, because there is room for space,
As the potentiometer 14, a sufficiently large and durable one can be used.

[0020]

EFFECTS OF THE INVENTION The electric motorcycle according to the present invention has a strong structure especially in the lower part of the main frame, and efficiently stores the battery 2 and various functional parts arranged inside the main frame. In addition to the protection structure, the bank angle θ at the time of traveling and turning is also sufficiently taken into consideration, so that it has a degree of freedom in design, and is excellent in protection against a fall and steerability. Moreover, since the protection of the functional parts and the countermeasure against the heat generation are sufficiently configured, and the arrangements for linking the parts are sufficiently taken into consideration, a high-performance and high-quality electric two-wheeled vehicle can be provided.

[Brief description of drawings]

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

FIG. 2 is a plan view of an electric motorcycle.

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

[Explanation of symbols]

 18 Foot step 1a, 1b Pipe material θ Bank angle 2 Battery 3,4 Power element 5 Converter 10 Control circuit 12 Seat 6a Heat dissipation fin 6 Heat sink 16 Motor 19 Rear wheel 17 Stepless transmission 8 Power cable 9 Current sensor 13 Throttle grip 14 Potentiometer 11 Luggage compartment 15 Flexible wire

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Kuniyuki Ito 1 Higashishinmachi, Higashi-ku, Nagoya, Aichi Chubu Electric Power Co., Inc. No. Kyushu Electric Power Co., Inc. (72) Inventor Masao Ono 4415-2 Shin-Yoshida-cho, Kohoku-ku, Yokohama-shi, Kanagawa Tokyo R & D Co., Ltd. (72) Inventor Shigeo Hirose 4415, Shin-yoshida-cho, Kohoku-ku, Yokohama-shi, Kanagawa 2 Within Tokyo R & D Co., Ltd.

Claims (4)

[Claims] 1. In an electric two-wheeled vehicle, a pipe material that constitutes a main frame of the electric frame is arranged such that the upper two pipe materials in the cross section of the foot step portion are arranged at the outermost edge positions of the foot step portion and the lower two pipe materials. The pipe material is arranged at the lower corner position of the inverted trapezoid in consideration of the bank angle, the battery is mounted inside the lower two pipe materials, and the upper and lower pipe materials are placed on both sides of the battery. Electronic components such as a motor control power element, a charger switching power element, and a converter are arranged within the inverted trapezoidal bank angle to connect, and the control circuit for controlling the power element is an openable and lockable seat. An electric motorcycle that is installed in the space below. 2. The motor control power element and the charger switching power element are installed on the upper surface of a heat sink having long and downward heat radiation fins in a direction parallel to the traveling direction of the electric motorcycle. The electric motorcycle according to claim 1, wherein the heat radiation fins of the heat sink are exposed on a lower surface of the foot step. 3. In an electric two-wheeled vehicle, a motor of a traveling power source is installed at a portion of one side of a main frame of the two-wheeled vehicle which is close to a rear drive wheel, and the motor is on the other side. It is connected to the drive wheels via a continuously variable transmission with a belt installed in almost half the part,
A power element for motor control is installed under the foot step portion on the same side as the position of the motor, and a current sensor for motor control is installed at an intermediate position of a power wire connecting the power element and the motor. An electric two-wheeled vehicle characterized by having 4. In an electric two-wheeled vehicle, an accelerator sensor such as a potentiometer for detecting the opening degree of a throttle grip is installed in a space under a seat adjacent to a control circuit for sending a signal to a power element of a motor. An electric two-wheeled vehicle in which an accelerator sensor and a throttle grip are connected by a flexible wire.