JPH0591693A - Generator for motor cycle - Google Patents

Abstract

PURPOSE:To provide a generator for motor cycle which is downsized to be contained within the width of cylinder block with margin by increasing the rotational speed and in which the bank angle of vehicle can be increased. CONSTITUTION:A generator 6 to be driven through an engine is disposed at the upper part of crank case within lateral width of cylinder block in the rear thereof. Rotor shaft 8a of the generator is supported at the opposite ends thereof and a drive shaft 12 extends laterally inward from the rotor shaft. Furthermore, a small diameter sprocket 13 is secured to the drive shaft while being disposed closely to a generator side bearing 23 and a chain 15 is entrained about the small diameter sprocket and a large diameter sprocket 14 secured to a crankshaft 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for driving a power generator such as a motorcycle.

[0002]

2. Description of the Related Art Conventionally, in a motorcycle or the like equipped with an engine in which a plurality of cylinder blocks are provided so as to stand up above a crankcase, the cylinder blocks are located behind the cylinder blocks in the widthwise direction of the vehicle body and in the crankcase. A structure in which a generator driven by the engine is provided on the upper portion of the head is known as disclosed in Japanese Patent Laid-Open No. 172823/1982.

In the above generator, a belt is stretched between a driving pulley fixed to the shaft end of the crankshaft and a pulley connected to the generator to generate the rotational force of the crankshaft. It is transmitted to the machine to rotate the electrons and generate electricity.

[0004]

In such a generator drive device, the rotating shaft of the generator by the drive pulley is rotated without being increased in speed, so that the generator is inevitably large in size. , Therefore, it becomes difficult to fit the generator including the transmission within the width of the cylinder block, and
If the diameter of the crank at the end of the crankshaft is increased to increase the speed of the rotating shaft of the generator, the crankcase inevitably becomes large and the bank angle of the vehicle cannot be increased.

The present invention has been made in view of the above problems, and an object of the present invention is to speed up the rotation of the generator to reduce the size of the generator and allow a margin within the width of the cylinder block. It is an object of the present invention to provide a power generation device for a motorcycle or the like that can be stored while holding a bank angle of the vehicle.

[0006]

In order to achieve the above object, a power generator for a motorcycle or the like according to the present invention is provided behind a cylinder block within the width of the cylinder block in the vehicle body left-right direction and above the crankcase. A drive shaft provided with a generator driven by the engine, supporting the rotor shaft of the generator on both sides, and extending inward in the left-right direction of the vehicle from the rotor shaft of the generator supported on both sides Is arranged, and a small diameter sprocket is fixed to the drive shaft in the vicinity of the bearing on the generator side,
A chain is stretched between the small diameter sprocket and the large diameter sprocket fixed to the crankshaft.

[0007]

In the power generator of the motorcycle or the like configured as described above, the rotation of the crankshaft is caused by the rotation of the large diameter sprocket, the chain, and the small diameter sprocket fixed to the drive shaft in the vicinity of the generator side bearing. Since the rotation of the drive shaft is faster than the rotation of the crank shaft, the power generation capacity of the generator is increased by the rotation of the drive shaft, and
Since the rotor shaft of the generator can be supported by both ends and the diameter of the rotor shaft can be made small, the generator can be made quite small. Also, since the small diameter sprocket is fixed to the drive shaft inside the generator close to the bearing on the generator side, the large diameter sprocket that drives the small diameter sprocket must also be fixed to the crankshaft inside the generator. become,
Since the large-diameter sprocket is not at the crankshaft end, it does not hinder the bank angle of the vehicle.

[0008]

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a motorcycle equipped with a power generator according to the present invention, in which 1 is a front wheel, 2 is a rear wheel, and 3 is an engine. The engine 3 has a crank case 4 arranged at a lower portion thereof, and a cylinder block 5 is mounted on an upper portion of the crank case 4 so as to rise upward.

As shown in FIG. 2, a generator 6 is provided behind the cylinder block 5 within the width of the cylinder block 5 in the left-right direction of the vehicle body and above the crank case 4 with the generator 6 exposed. It is designed to be driven by.

By disposing the generator 6 in the above-mentioned position, it is less likely that the water droplets splashed up by the front wheel 1 will be directly applied to the generator 6. That is, the range of splashed water splashes from the grounding point of the front wheel 1 is on the front side of the chain lines F and F, and the range of splashed water splashes from the rear end of the front wheel 1 is the chain line. R,
This is because it is on the front side of R and the front of the generator 6 is blocked by the cylinder block 5 and the lower crankcase 4.

FIG. 3 shows the details of the generator 6. Reference numeral 7 is a casing, 8 is a rotor having an exciting coil 8b, and 9 is a stator having a field coil 9b. The rotor 8 has a rotor shaft 8a at its shaft center, and both ends of the shaft are supported by bearings 10, 10.

A spline 11 is provided at one end of the rotor shaft 8a, and the rotor shaft 8a is detachably fitted to the end of the drive shaft 12 through the spline 11.
The drive shaft 12 is the rotor shaft 8 of the two-sided generator.
It extends inward in the left-right direction of the vehicle body from a, is supported by a bearing 23 on the generator 6 side, and has a small-diameter sprocket 13 near the bearing 23.

The small diameter sprocket 13 is a chain 15
It is connected to a large-diameter sprocket 14 on the crankshaft 16 side via a drive shaft to drive the rotor shaft 8a by inputting rotational power from the crankshaft 16 while increasing the speed.

Further, a commutator 17 is provided on the other end side of the rotor shaft 8a, and a brush 18 comes into contact with the commutator 17 so that a current flows through the exciting coil 8b. In addition, fans 2 are provided on both sides of the rotor 8, respectively.
Nos. 0 and 20 are provided so as to be rotated together with the rotor 8. On the other hand, the wall surface of the casing 7 is provided with a large number of through holes 21 on its front end surface and side surface.
Is provided. Therefore, the outside air is sucked into the casing 7 as shown by A in the figure by the air flow caused by the fan 20, and the air flows through the inside of the casing and passes through the other through hole 21. It is exhausted to the outside like B. Therefore, while the rotor 8 is rotating to generate electricity, fresh air always flows through the casing 7 to cool the inside. An inner wall 22 is provided on the air intake side of the casing 7 at a right angle to the rotor shaft 8a and close to the fan 20 on the intake side. The inner wall 22 is erected from the wall surface of the casing 7. Through hole 22 near the center of generator 6
a is provided.

Therefore, in the above-mentioned power generator, the front wheel 1 is flipped up by disposing the generator 6 behind the cylinder block 5 within the width of the cylinder block in the vehicle body left-right direction and above the crankcase. It rarely receives water splash directly. The rotation of the crankshaft 16 is
Since the large-diameter sprocket 14 is transmitted via the chain 15 to the small-diameter sprocket 13 fixed to the drive shaft 12 in the vicinity of the generator-side bearing 23, the rotation of the drive shaft 12 is increased more than the rotation of the crankshaft 16. Since the speed is increased, the power generation capacity of the generator 6 by the rotation of the drive shaft 12 is increased, and the rotor shaft 8a of the generator 6 is supported by both ends so that the rotor shaft 8a can have a small diameter. The generator 6 can be made quite small. Furthermore, small diameter sprocket 1
3 is a generator side bearing 23 on the drive shaft 12 inside the generator 6.
The large diameter sprocket 14 that drives the small diameter sprocket 13 is also fixed to the crankshaft 16 inside the generator 6, because the large diameter sprocket 14 is fixed close to the crankshaft 16. This is not a cause of obstructing the bank angle of the car, and the bank angle of the car can be made large.

[0016]

As described above, according to the present invention, there is provided a power generator for a motorcycle or the like, in which the generator is disposed behind the cylinder block within the width of the cylinder block in the vehicle body left-right direction and above the crankcase. The generator is less likely to be directly splashed with water splashed by the front wheels, and the generator can be sufficiently prevented from being contaminated.

Further, since the rotation of the crankshaft is transmitted from the large diameter sprocket to the small diameter sprocket fixed to the drive shaft in the vicinity of the generator side bearing through the chain,
The rotation of the drive shaft is accelerated more than the rotation of the crank shaft, and the power generation capacity of the generator is increased by the rotation of the drive shaft,
Moreover, since the rotor shaft of the generator is supported by both ends, the rotor shaft can also have a small diameter, so that the generator can be further downsized, so that the generator is within the width of the cylinder block. You can afford it.

Further, since the small-diameter sprocket is fixed to the drive shaft inside the generator in the vicinity of the generator-side bearing, the large-diameter sprocket that drives the small-diameter sprocket is also fixed to the crankshaft inside the generator. Since the large-diameter sprocket is not located at the crankshaft end, it does not hinder the bank angle of the vehicle, and the vehicle can have a large bank angle.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle equipped with a power generator according to the present invention.

FIG. 2 is a schematic explanatory view showing a principal part of the motorcycle of FIG. 1 as a plane.

FIG. 3 is a vertical cross-sectional view of a generator in the power generator according to the present invention.

[Explanation of symbols]

 3 Engine 4 Crank Case 5 Cylinder Block 6 Generator 8a Rotor Shaft 10 Rotor Bearing 12 Drive Shaft 13 Small Diameter Sprocket 14 Large Diameter Sprocket 15 Chain 16 Crankshaft 23 Generator Side Bearing

Claims (1)

[Claims] 1. A crankcase comprising a plurality of cylinder blocks.
In a motorcycle or the like equipped with an engine installed so as to stand up on the upper part of the engine, a generator driven by the engine is installed behind the cylinder block within the width of the cylinder block in the vehicle body left-right direction and on the upper part of the crankcase. Providing a two-sided support for the rotor shaft of the generator, and arranging a drive shaft extending inward from the rotor shaft of the both-supported generator in the left-right direction of the vehicle body, close to the generator-side bearing A small diameter sprocket is fixed to the drive shaft, and a chain is stretched between the small diameter sprocket and the large diameter sprocket fixed to the crankshaft.