JP3247989B2 - Electric motorcycle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electric motorcycle in which a rear wheel is driven by a motor, and particularly to a structure of a power unit.

[Conventional technology]

2. Description of the Related Art Conventionally, in motorcycles such as scooters, a wrapping transmission device mainly using a chain or a belt has been employed to transmit the power of an engine to a rear wheel. Since the sprocket and pulley of this wrapping transmission are supported with their axes parallel to the vehicle width direction, the axis of the crankshaft of the engine that drives them must be parallel to the vehicle width direction to facilitate transmission of the rotation. It had been. That is, in the motorcycle engine, the cylinder is directed in a direction orthogonal to the vehicle width direction. In particular, in a unit swing type engine used for a scooter or the like, the cylinder is directed upward or forward.

[Problems to be solved by the invention]

However, in the conventional motorcycle in which the cylinder of the engine is directed in the direction orthogonal to the vehicle width direction, there is a limit in reducing the size of the vehicle body. This is because the space occupied by the engine is large, and accessories must be arranged so as to avoid this engine. In particular, in a motorcycle equipped with a unit swing type engine, since the engine itself swings with respect to the body frame, if the cylinder is directed upward or forward, a large engine mounting space must be taken.

[Means for solving the problem]

An electric motorcycle according to the present invention has a low-floor footrest portion between a front wheel and a rear wheel, and is bent rearwardly upward at a rear side of the footrest portion to extend rearwardly and substantially horizontally below a seat. A rear frame formed so as to extend to the rear, the rear wheel is driven by a motor in an electric motorcycle, a power unit of the electric motorcycle, a motor located in front of the rear wheel, A transmission case in which a motor is fixed and the rear wheel is rotatably supported at a rear portion; and transmission means built in the transmission case and transmitting the power of the motor to the rear wheels. Wherein the upper portion of the motor is connected to the rear frame via a bracket extending downward from the horizontally extending portion of the rear frame and a link member connected to the bracket. The motor is mounted on the transmission case with its axis parallel to the vehicle width direction, and the motor and the bent portion of the rear frame behind the footrest in the rear frame. Power is supplied to the motor by a first battery disposed in close proximity to the motor and a second battery disposed above and behind the motor and beside the rear wheel, and these batteries are supplied to the link member. On the other hand, they are arranged separately in front of and behind the vehicle body.

Further, an electric motorcycle according to another invention of the present invention is an electric motorcycle in which a rear wheel is driven by a motor, wherein the motor is fixed to a body frame, and on the body frame, on both left and right sides of the rear wheel. An arm located
The rear wheels are swingably supported by a rear arm having a horizontal pivot shaft connecting these arms,
The motor and the rear wheel are connected via a shaft drive type transmission means having a propeller shaft provided in one arm of the rear arm, and the propeller shaft is gear-coupled to an output shaft of the motor. A motor having one axis and a second axis connected to the first axis via a universal joint whose center is located on the same axis as the pivot axis, wherein the motor has its axis parallel to the longitudinal direction of the vehicle body. It is arranged at the center in the vehicle width direction and forward of the vehicle body from the pivot shaft.

(Operation)

According to the present invention, the rear wheels are driven by the motor,
The space in which the cylinders of the engine are arranged becomes unnecessary. In addition, by adopting a configuration in which the battery is arranged close to the motor and in front of and above the motor, the mass can be concentrated, and the size of the vehicle in the front-rear direction can be suppressed while lowering the center of gravity.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 is a side view showing an electric motorcycle according to the present invention,
FIG. 2 is a rear view, and FIG. 3 is a cross-sectional view of the power unit taken along the line III-III in FIG. In these figures, reference numeral 1 denotes a scooter-type motorcycle.
A low-floor footrest 4 is provided between the front wheel 2 and the rear wheel 3. Reference numeral 5 denotes a frame of the motorcycle 1. The frame 5 is composed of a front frame 5a made of a single tube, and two right and left rear frames 5b connected to the front frame 5a by a footrest 4. It is configured. The rear frame 5b is formed so as to be bent rearward at the rear side of the footrest 4 and extend rearward, and to extend substantially horizontally below the seat 8. A front fork 6 rotatably supports the front wheel 2. The front fork 6 is rotatably connected to a head pipe 5c of the front frame 5a. Reference numeral 7 denotes a steering wheel, 8 denotes a seat, and 9 denotes a vehicle body cover.

Reference numeral 10 denotes a power unit for driving the rear wheel 3, and the rear wheel 3 is rotatably supported by a rear portion of the power unit 10. The power unit 10 has a front portion connected to the left and right rear frames 5b so as to be vertically swingable, and a rear portion connected to the left rear frame via the cushion unit 11.
Supported by 5b. 12 is the left and right rear frame 5b
And a unit mounting bracket 13 extending downward from the horizontally extending portion of the rear frame 5b. Reference numeral 13 denotes a link member for connecting the unit mounting bracket power unit 10. The power unit 10 has almost the same structure as a unit swing type engine used in a conventional motorcycle except for the difference between the engine and the motor. As shown in FIG. And a motor 15, a V-belt type automatic transmission 16, and the like, which are located in front of the rear wheel 3 and are mounted in the transmission case 14.

The transmission case 14 includes the unit mounting bracket 12.
And a transmission portion 14b extending rearward from the drive portion 14a through the left side of the rear wheel 3,
The drive shaft 3a of the rear wheel 3 is rotatably supported by the transmission portion 14b. The drive portion 14a has a front portion formed in a substantially semicircular shape in a side view, and a bracket 14c for projecting the transmission case 14 to the link member 13 protrudes from the uppermost portion.

The motor 15 is mounted horizontally in a drive portion 14a of the transmission case 14 with its axis parallel to the vehicle width direction, and its output shaft 15a is connected to a V-belt type automatic transmission 16 via a clutch 17.
It is connected to. As the clutch 17, for example, a centrifugal clutch is employed. 18 is a motor cooling fan,
It is mounted on the free end of the output shaft 15a. A slit 14d for introducing outside air is opened on the right side of the drive section 14a, and an air outlet (not shown) is opened on a portion of the drive section 14a located below the motor 15. The motor 15 by the motor cooling fan 18
Is configured to be air-cooled.

The V-belt type automatic transmission 16 includes a drive pulley 19 that rotates together with a driven side of the clutch 17 and a drive shaft 3a of the rear wheel 3.
The pulley 20 includes a driven pulley 20 that rotates together with the pulley, a V-belt 21 stretched between these pulleys, and the like. It is a conventionally well-known thing. The drive pulley 19, the clutch 17 and the motor 15 are arranged on the same axis. 19a is a fixed pulley of the drive pulley 19, 19b is a movable pulley, 19c is a cam plate, and the weight 22 is interposed between the movable pulley 19b and the cam plate 19c.

Reference numerals 23 and 24 denote batteries serving as power supplies for driving the motor 15. These two batteries 23,2
4 are each supported by a rear frame 5b. As shown in FIGS. 1 and 2, the battery 23 is disposed on the right side of the vehicle body in the vehicle body cover 9, above the motor 15, and beside the rear wheels. The battery 24 is disposed in front of the power unit 10 and between the power unit 10 and the rear frame 5b so as to be close to the motor 15. More specifically, the battery 24 is disposed immediately before the motor 15 and between the motor 15 and the bent portion of the rear frame 5b behind the footrest 4 so as to be close to the motor 15. This battery 24 is the first battery according to the present invention.
And the battery 23 constitutes a second battery according to the present invention.

In the electric motorcycle 1 thus configured, the rotation of the output shaft 15a is transmitted from the clutch 17 to the rear wheel 3 via the V-belt type automatic transmission 16 by driving the motor 15. Since the motor 15 is oriented horizontally, the mounting space for the motor 15 can be provided inside the drive unit 10 simply by extending the drive unit 10 in the vehicle width direction.

Therefore, according to the present invention, the space for disposing the cylinder of the engine, which is required for the conventional motorcycle, is not required. In addition, since the battery 23 is arranged close to the top of the motor 15 and the battery 24 is arranged close to the front of the motor 15, the mass can be concentrated and the center of gravity can be reduced. In addition, an increase in the size of the vehicle body in the front-rear direction can be suppressed.

In this embodiment, the clutch 17 is interposed between the motor 15 and the V-belt type automatic transmission 16.
By using a low rotation speed type motor as the motor 15, the motor 15 can be made unnecessary. In this case, the V-belt type automatic transmission 1 is connected to the output shaft 15a of the motor 15.
The sixth drive pulley 19 can be directly mounted on the shaft.

In this embodiment, an example is shown in which the V-belt type automatic transmission 16 is employed as a transmission means for transmitting the power of the motor 15 to the rear wheel 3, but it may be of a shaft drive type as shown in FIG. .

FIG. 4 is a cross-sectional view of a power unit having a shaft drive type transmission means.
For the same or equivalent members as described in the figures,
The same reference numerals are given and detailed description is omitted. In FIG. 4, reference numeral 31 denotes a propeller shaft as a main body of a shaft drive type transmission means. The propeller shaft 31 is rotatably supported in the transmission case 14 and has a bevel gear at the front end.
The rear end is connected to the output shaft 15a of the motor 15 via 32,33, and the rear end is connected to the drive shaft 3a of the rear wheel 3 via bevel gears 34,35. In this embodiment, the output shaft 15a is connected to the propeller shaft 31 without using a clutch or the like.

As described above, even with the shaft drive type, the same effect as that of the present embodiment can be obtained.

Next, another electric motorcycle according to the present invention will be described in detail with reference to FIGS. 5 (a), (b) and 6. FIG.

5 (a) and 5 (b) are views showing another electric motorcycle according to the present invention, wherein FIG. 5 (a) is a plan view and FIG. 5 (b) is a side view. FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5 (b). In these figures, FIGS.
For the same or equivalent members as described in the figures,
The same reference numerals are given and detailed description is omitted. In these figures, reference numeral 41 denotes an electric motorcycle in which a rear wheel 3 is swingably connected to a vehicle body via a rear arm 42. This rear arm
42 are arm portions 43 and 44 located on the left and right of the rear wheel 3.
And a horizontal pivot shaft connecting these arms
It is composed of 45 mag. And this rear arm 42
Is connected to the vehicle body by rotatably supporting the pivot shaft 45 on a rear arm support member 46 fixed to a frame (not shown). Reference numeral 46b denotes a bracket for fixing the rear arm support member 46 to a frame. The left arm 43 of the rear arm 42 is
A propeller shaft 47 as a shaft drive type transmission means for transmitting the power of a motor to be described later to the rear wheel 3 is provided therein, and the propeller shaft 47
A gear box 48 for connecting the rear wheel 3 to the vehicle is mounted.

Reference numeral 49 denotes a motor for driving the rear wheel 3.
The output shaft 49a is located near the center of the vehicle body in the width direction and is fixed to the frame with its axial direction parallel to the front-rear direction of the vehicle body. The center line of the vehicle body is indicated by a chain line A. The output shaft 49a of the motor 49 protruding rearward of the vehicle body is connected to the propeller shaft 47 via a drive gear 51 mounted on the output shaft 49a and a driven gear 52 meshing with the drive gear 51. Are linked. Reference numeral 53 denotes a gear housing for housing these gears. The gear housing 53 is also fixed to the frame in the same manner as the motor 49.

The propeller shaft 47 includes a first shaft 47a that rotates together with the driven gear 52, a second shaft 47b connected to the first shaft 47a via a universal joint 54, and a second shaft 47b spline-connected to the second shaft 47b. It is composed of three axes 47c. The rear end of the third shaft 47c is connected to the drive shaft 3a of the rear wheel 3 via bevel gears 55 and 56. Note that the center position of the universal joint 54 is
It is positioned on the same axis as 45.

57 and 58 are batteries for driving the motor 49. In this embodiment, the batteries 57, 58 are respectively arranged below the seat 8. One of the batteries 57 is on the vehicle center line A and is just
The other battery 58 is disposed at a relatively low position directly above the battery 57, at a position above the battery 57 and on the right side behind the battery 57.

Reference numeral 59 denotes a leg shield for preventing mud and the like jumped up by the front wheel 2 from getting on the occupant's feet. The lower rear portion of the leg shield 59 is formed so as to overlap the upper portion of the motor 49 when viewed from the side. With this configuration, the running wind is guided to the motor 49 by the leg shield 59, so that the cooling performance of the motor 49 can be improved.

In the electric motorcycle 41 configured as described above, when the motor 49 is driven, the rotation of the output shaft 49a causes the drive gear 5 to rotate.
1, transmitted to the rear wheel 3 via the driven gear 52 and the propeller shaft 47. Since the axial direction of the motor 49 is parallel to the front-rear direction of the vehicle body, the motor 49
Can be obtained simply by providing a columnar space in front of the pivot shaft 45 that swingably supports the rear arm 42 and whose axial direction is the vehicle longitudinal direction.

Therefore, even with such a configuration, the space for disposing the engine cylinder, which is required for the conventional motorcycle, becomes unnecessary.

〔The invention's effect〕

As described above, the electric motorcycle according to the present invention is:
A low-floor footrest between the front wheel and the rear wheel, and a rear frame formed so as to be bent rearward at the rear of the footrest and extend rearward and extend substantially horizontally below the seat. In the electric motorcycle in which the rear wheels are driven by a motor, a power unit of the electric motorcycle includes a motor positioned in front of the rear wheel, a motor fixed to a front portion and a rear portion mounted to the rear portion. A transmission case in which the wheels are rotatably supported, and built into this transmission case,
A transmission means for transmitting the power of the motor to the rear wheels, and a bracket that extends downward from the horizontally extending portion of the rear frame at a front portion of the power unit and above the motor; The rear frame is swingably supported on the rear frame via a link member connected to a bracket, and the motor is mounted on a transmission case with its axis parallel to the vehicle width direction. A first battery disposed close to the motor between the rear frame and the bent portion behind the footrest, and a second battery disposed rearward above the motor and beside the rear wheel. Power is supplied to the motor, and these batteries are distributed to the front and rear of the vehicle body with respect to the link member. Is moving, the space in which the cylinder has been arranged in the engine is not required.

Therefore, other components can be arranged in the space where the cylinder of the engine is conventionally arranged, and the size of the vehicle can be reduced. By placing the battery close to the motor using the large space formed in front of and above the power unit, the mass can be concentrated, and the center of gravity can be reduced while lowering the center of gravity. Size can be suppressed. Also, when a plurality of batteries are mounted, it is possible to prevent the wiring connecting each battery and the motor from becoming unnecessarily long.

An electric motorcycle according to another aspect of the present invention is an electric motorcycle in which a rear wheel is driven by a motor. In the electric motorcycle, the motor is fixed to a vehicle body frame, and the motor is located on both left and right sides of the rear wheel. The rear wheel is swingably supported by a rear arm having an arm and a horizontal pivot shaft connecting the arms, and a shaft drive type transmission means having a propeller shaft provided inside one arm of the rear arm is provided. The propeller shaft is connected to a first shaft gear-coupled to the output shaft of the motor, and a universal joint whose center is located on the same axis as the pivot shaft. A second shaft connected to the first shaft,
Since the motor is disposed at the center of the vehicle width direction with the axial direction thereof parallel to the front-rear direction of the vehicle body and forward of the vehicle body from the pivot shaft, the rear wheels are driven by the motor, and the engine cylinder is disposed. The space that was being used becomes unnecessary.

Therefore, other components can be arranged in the space where the cylinder of the engine is conventionally arranged, and the size of the vehicle can be reduced. Also, since only the rear arm swings with the rear wheel with respect to the body frame, the space formed to avoid interference with the swing member can be made as small as possible, and a compact electric motorcycle can be manufactured. Can be formed.

In particular, if a configuration is adopted in which the motor is built into the power unit, other parts are placed close to the front of the power unit because there is no large protrusion like the conventional cylinder at the front of the power unit. it can. In addition, since the position of the pivot shaft for swingably connecting the power unit to the vehicle body can be positioned at an arbitrary position in front of the power unit, there is an effect that the degree of freedom in design is increased.

[Brief description of the drawings]

1 is a side view showing an electric motorcycle according to the present invention, FIG. 2 is a rear view of the same, and FIG. 3 is a sectional view of the power unit taken along the line III-III in FIG. FIG. 4 is a cross-sectional view of a power unit provided with a shaft drive type transmission means, and FIGS. 5 (a) and 5 (b) are views showing another electric motorcycle according to the present invention, wherein FIG. FIG. 3B is a side view. FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5 (b). 1,41 ... electric motorcycle, 3 ... rear wheel, 5 ... frame, 10 ... power unit, 14 ... transmission case, 15,49 ...
... Motor, 16 ... V-belt type automatic transmission, 23,24,57,5
8 …… Battery, 31,47 …… Propeller shaft, 42 ……
Rear arm, 45 ... Pivot shaft.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeo Ogi 2500 Shinkai, Iwata-shi, Shizuoka Prefecture Inside Yamaha Motor Co., Ltd. (72) Inventor Mitsuo Suzuki 2500 Shinkai, Iwata-shi, Shizuoka Prefecture Inside Yamaha Motor Co., Ltd. (56) References JP-A-3-292278 (JP, A) JP-A-4-31191 (JP, A)

Claims (2)

(57) [Claims] 1. A low-floor footrest between a front wheel and a rear wheel, a rearwardly bent part of the rear part of the footrest that extends upward and extends substantially horizontally below a seat. In the electric motorcycle having a rear frame formed and a rear wheel driven by a motor, a power unit of the electric motorcycle is provided with a motor positioned in front of the rear wheel, and the motor fixed to a front portion. And a transmission case in which the rear wheel is rotatably supported at the rear, and transmission means built in the transmission case and transmitting the power of the motor to the rear wheel. An upper portion of the motor is swingably supported by the rear frame via a bracket extending downward from the horizontally extending portion of the rear frame and a link member connected to the bracket. The motor is mounted on the transmission case with its axis parallel to the vehicle width direction.The motor is positioned immediately before the motor and between the motor and the bent portion behind the footrest in the rear frame. And a second battery disposed above the motor and on the side of the rear wheel to supply power to the motor, and supply these batteries to the link member in front of the vehicle body with respect to the link member. An electric motorcycle characterized by being distributed to the rear. 2. An electric motorcycle in which a rear wheel is driven by a motor, wherein the motor is fixed to a body frame, and an arm located on both left and right sides of the rear wheel, and the arms are fixed to the body frame. The rear wheel is swingably supported by a rear arm having a horizontal pivot shaft connected thereto, and the motor and the rear wheel are connected to each other through a shaft drive type transmission means having a propeller shaft provided inside one arm of the rear arm. The propeller shaft is connected to the first shaft through a universal joint whose center is located on the same axis as the pivot shaft, and a first shaft gear-coupled to the output shaft of the motor. A motor having a central axis in the vehicle width direction with the axis of the motor parallel to the front-rear direction of the vehicle body. Electric motorcycle being characterized in that disposed in front of.