JPS6217370A - Igniter for motor-cycle - Google Patents

Abstract

PURPOSE:To reduce the width of engine and to improve the maneuverability of motor-cycle by arranging an ignition power source generator at the front face section of engine while an ignition timing detector at the crankshaft end section of engine. CONSTITUTION:2-cycle engine 12 is mounted at the lower central portion of body 11 of racing motor-cycle 10. An ignition power source generator 16 is arranged at the front face section of engine 12 with respect to the advancing direction of vehicle. While an ignition timing detector 18 is arranged at the end section of engine crankshaft 17. Consequently, the width of engine 12 associated with ignition power source generator 16 is reduced to deepen the bank angle when cornering resulting in improvement of maneuverability.

Description

[Detailed description of the invention] [Industrial application field] This invention is an eye! ! ) Regarding an ignition system for a 12-wheeled vehicle.

[Prior Art] Conventionally, a two-wheeled motor vehicle equipped with a two-stroke engine mounted at the lower center of the vehicle body has an ignition power source generator and an ignition timing detection device installed at the end of the engine's crankshaft. This ignition device for a motorcycle uses an ignition timing detection device to directly detect a specific rotation angle position of the crankshaft corresponding to the ignition timing, thereby making it possible to control the ignition timing with high precision.

[Problems to be Solved by the Invention] Incidentally, in a motorcycle, it is desired to be able to take a deeper bank angle of the vehicle during cornering in order to improve the cornering performance of the vehicle.

However, as described above, in conventional motorcycles, the ignition power generator and the ignition timing detection device are installed at the end of the crankshaft of the engine, that is, at the left or right side of the engine. Therefore, the width of the engine unit protrudes laterally by the volume of the ignition power source generator and the ignition timing detection device, making it difficult to obtain a deeper bank angle.

An object of the present invention is to reduce the width of an engine equipped with a generator for one ignition power source, thereby improving the maneuverability of a vehicle.

[Means for Solving the Problems] The present invention provides an ignition device for a two-wheeled motor vehicle having a two-stroke engine mounted at the lower center of the vehicle body, in which a generator for ignition power is installed in the front part of the engine, An ignition timing detection device is installed at the end of the engine's crankshaft.

[Operation] According to the present invention, only the ignition timing detection device is installed at the end of the crankshaft of the engine.

Therefore, it is possible to reduce the width of the engine including the ignition power generator and improve the maneuverability of the vehicle.

Note that a motorcycle equipped with a two-stroke engine to which the present invention is applied is equipped with an intake piping system such as an intake pipe and a carburetor at the rear of the engine. However, in the present invention, since the ignition power generator is disposed at the front of the engine, the ignition power generator can be easily installed without interfering with the intake piping system.

[Embodiment] FIGS. 1 and 2 show a racing two-wheeled motor vehicle IO to which the present invention is applied, and an engine 12 is mounted in the lower center of a main body 11 thereof. The engine 12 is a two-stroke engine, and includes a cylinder block 14 on the top of a crankcase 13, and an intake piping system such as a carburetor 15 on the rear side of the cylinder block 14 in the direction of vehicle travel.

As shown in FIG. 3, the two-wheeled motor vehicle 1O has an A! An ignition power source generator 16 is installed on one side. Further, an ignition timing detection device 18 is installed at the end of the crankshaft 17 in the engine 12.

The ignition power generator 16 is a flywheel magneto 19
and one power generation coil 20. The flywheel magneto 19 includes a permanent magnet 21 and is coupled to the crankshaft 17 via a gear or a chain so as to be interlockable.

The ignition timing detection coil 23, which includes the ignition timing detection device 18a, the timing rotor 22, and the ignition timing detection coil 23, detects the protrusion of the timing rotor 22 that is directly connected to the crankshaft 17. 1
The predetermined rotational angle position of 7 can be directly detected and an ignition signal current can be generated.

In other words, the ignition power source generator 16 is C as shown in FIG.
In the DI ignition circuit, the voltage generated in the generator coil 20 is rectified by the diode 24 and charged into the ignition capacitor 25. Note that when the ignition signal current generated in the ignition timing detection coil 23 enters the gate of the 5CR27 via the diode 26, the electric charge of the ignition capacitor 25 is discharged to the ignition coil 28 at the same time as the 5CR27 becomes conductive, and a spark is generated in the ignition plug 29. will occur.

According to the motorcycle 10, only the ignition timing detection device 18 is installed at the end of the crankshaft 17 in the engine 12. Therefore, the ignition power generator 16
It is possible to reduce the width of the engine 12 provided with the engine 12, and to take a deeper bank angle α during cornering, thereby improving the maneuverability of the vehicle.

Furthermore, the ignition timing detection device 18 installed at the end of the crankshaft 17 in the engine 12 is relatively lightweight;
Therefore, it is possible to improve the maneuverability of the vehicle even with the weight of the engine unit (7).

Further, since the ignition timing detection device 18 has its timing rotor 22 directly connected to the end of the crankshaft 17, the ignition timing of the engine 12 can be controlled with high precision as in the conventional case.

Note that FIG. 3 illustrates a four-pole ignition power source fi16. However, in carrying out the present invention, if a multi-pole generator with 8 or more poles is used as the generator 16 for one ignition power source, the external dimensions can be further reduced by improving power generation efficiency, and the width of the engine unit can be reduced. In addition to increasing the number of charging cycles, it becomes possible to synchronize power generation output and ignition timing with high precision.

[Effects of the Invention] As described above, according to the present invention, the ignition timing detection device is only installed at the end of the crankshaft of the engine.
Therefore, the width of the engine equipped with the ignition power generator has been reduced to improve vehicle maneuverability.

[Brief explanation of drawings]

FIG. 1 is a side view showing a motorcycle to which the present invention is applied, FIG. 2 is a front view showing the cornering state of the motorcycle in FIG. 1, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a side view showing essential parts of the motorcycle according to the example, and FIG. 4 is a circuit diagram showing the ignition device of the engine shown in FIG. 3. DESCRIPTION OF SYMBOLS 10... Two-wheeled motor vehicle, 11... Main body, 12... Engine, 16... Generator for ignition power supply, 18... Ignition timing detection device. Agent Patent Attorney Osamu Shiokawa Figure 1 Figure 2

Claims (1)

[Claims] (1) In an ignition system for a motorcycle equipped with a two-stroke engine mounted at the lower center of the vehicle body, a generator for ignition power is installed at the front of the engine, and an ignition timing detection device is installed at the end of the engine's crankshaft. An ignition system for a two-wheeled motor vehicle, characterized in that it is equipped with a.