JP2942391B2 - Ignition device mounting structure for motorcycles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a motorcycle,
The present invention relates to an ignition device mounting structure including an ignition coil integrated plug cap.

[0002]

2. Description of the Related Art An ignition device in which an ignition coil and a plug cap are integrally formed to eliminate the need for a high tension cord is well known. For example, in JP-A-62-51760, an ignition coil integrated plug cap in which an ignition coil and a plug cap are integrally formed in a case is mounted on a spark plug of an engine.
The case is supported and fixed to a shroud that covers a cylinder head of the engine directly or via an elastic member.

[0003]

In recent years, a shroud for covering an engine cylinder head has been made of resin in order to reduce weight and reduce noise, and in order to reduce noise, a system in which the ignition coil integrated plug cap is directly attached to the shroud has been proposed. Instead, a method of supporting while floating via an elastic member such as rubber is often adopted. However,
Since the vibrations around the engine are particularly large, there is a problem that the rigidity around the spark plug of the shroud is increased, and the plug cap may come off unless it is securely fixed with bolts and the like. Due to the functionalization, the space around the engine has become narrower, and especially the head surface of the shroud has the problem that it is difficult to insert tools such as a screwdriver or wrench for maintenance, and it is extremely difficult to fix the plug cap with bolts. ing. In order to solve this, it is conceivable to provide a stay on the ignition coil integrated plug cap, extend it and provide a mounting part at a place where tools are easy to use, such as the engine side,
Due to the large vibration of the engine, a very rigid stay is required. As described above, when the ignition coil integrated plug cap is to be fixed to the shroud, high rigidity is required for the shroud and, in some cases, the ignition coil side, and the cost is increased.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem, and it is possible to securely support an ignition coil-integrated plug cap, and to mount an ignition device in a motorcycle in which a spark plug can be easily replaced. The purpose is to provide a structure.

[0005]

For that purpose, the mounting structure of the ignition device in the motorcycle according to the present invention comprises a cooling fan 18 mounted on the crankshaft 16 of the engine 11.
A shroud 9a, 9b fixed to cover the periphery of the engine 11, an intake port 10, an exhaust port 20, and a spark plug insertion hole 21 formed in the shroud 9a, 9b;
It is characterized by comprising a mounting stay 22 formed integrally with the engine and extending from the exhaust port 20 to the outside, and an ignition coil integrated plug cap 25 mounted on the mounting stay 22. The number added to the above configuration is
This is to be compared with the drawings, and the configuration of the present invention is not limited in any way.

[0006]

In the present invention, for example, as shown in FIG.
Put the shroud 9b over the engine 11 and
7 and the mounting stay 22 are respectively inserted into the ignition plug insertion holes 21.
Then, the shroud 9b is fixed to the engine 11 in a state where the shroud 9b protrudes from the exhaust port 20, and then the ignition coil integrated plug cap 25 is mounted on the mounting stay 22,
The ignition plug 17 is inserted into the plug cap 26. Therefore, the heavy ignition coil 30 is supported by the engine 11 via the mounting stay 22, so that the vibration can be absorbed, the plug cap 26 can be prevented from coming off, and the ignition plug 17 can be easily replaced. Becomes

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is a side view of a motorcycle to which the present invention is applied. 1 is a head pipe, 2 is a front fork, 3 is a front wheel, 5 is a main frame, 6 is a seat, 7 is a rear wheel, 8 Is a muffler, 9 is a shroud for covering the cylinder head of the engine according to the present invention, and has an intake port 10 for taking in cooling air to the engine. In addition,
The invention is not limited to the illustrated scooter type.

FIGS. 1, 2 and 3 show an embodiment of a mounting structure of an ignition device for a motorcycle according to the present invention. FIG. 1 is a sectional view, and FIG. 2 is a perspective view of a shroud and a case in FIG. 3 is an exploded perspective view of the components in FIG.

In FIG. 1, reference numeral 11 denotes an engine, 12 denotes a cylinder head, 13 denotes a cylinder block, 14 denotes a piston, 15 denotes a connecting rod, and 16 denotes a crankshaft. A cooling fan 18 is attached to 16. The shroud 9 covering the engine 11
It consists of two divided shrouds 9a and 9b,
It is fixed to the engine 11 via seal members 19 and 24 such as rubber. An intake port 10 is formed in one of the split shrouds 9a so as to face the cooling fan 18, and an exhaust port 20 and a spark plug insertion hole 21 are formed in the other split shroud 9b.
Are formed, and the cooling fan 18 is rotated in conjunction with the crankshaft 16 to allow the ventilation as shown by the arrows in the figure to cool the engine 11. A mounting stay 22 is formed integrally with the cylinder head 12, and the mounting stay 22 extends upward from the exhaust port 20.

FIG. 2 shows an ignition coil-integrated plug cap 25 in which a plug cap 26 and a coil case 27 are integrally formed. In the plug cap 26, a resistor 28 and a spring connector 29 are inserted. And fixed by mounting screws 23, and coil case 2
The ignition coil 30 is inserted into the terminal 7, and the high-voltage side terminal 31 extends in an L-shape from the bottom to the top, and the resistor 2
8 so as to be in contact with the head. The ignition coil 30 has an iron core 32, a primary coil 33, a secondary coil 34, and a low-voltage terminal 35. Coil case 2
The bracket 37 is integrally formed on the side surface of the bracket 7 and is fixed to the mounting stay 22 by bolts 38.

An elastic member 3 is provided below the plug cap 26.
6 is fixed. The elastic member 36 includes a tongue piece 36a press-fitted into the insertion hole 21, a tongue piece 36b abutting on the split shroud 9b, and a fitting portion 36c into which the spark plug 17 is fitted.
Having.

The method of mounting the ignition device of the present invention having the above structure will be described. As shown in FIG. 3, first, the split shroud 9b is placed over the engine 11, and the ignition plug 17 and the mounting stay 22 are respectively inserted into the ignition plug insertion holes. 2
The split shroud 9 b is fixed to the engine 11 in a state where the split shroud 9 b protrudes from the exhaust port 20. Next, mounting stay 2
An ignition coil integrated plug cap 25 is attached to 2, an ignition plug 17 is inserted into the plug cap 26, and the divided shroud 9 a is fixed to the divided shroud 9 b and the side surface of the engine 11. Therefore, the heavy ignition coil 30 is supported by the engine 11 via the mounting stay 22, so that the vibration can be absorbed, the plug cap 26 can be prevented from coming off, and the ignition plug 17 can be easily replaced. Becomes

The present invention is not limited to the above embodiment, and various modifications can be made by those having ordinary knowledge in the technical field to which the present invention belongs. For example, in the above embodiment, the shroud is divided, but the same operation and effect can be obtained also with an integrated shroud.

Next, the connector structure of the plug cap 26 will be described. A plug cap having no internal resistor for preventing ignition noise has a simple structure and is inexpensive, but a plug cap having a resistor is not simple in the shape of the connector structure and is complicated and expensive to process. FIG. 5 shows the structure of a conventional plug cap.
Inside, a resistor 52 connected to the ignition coil is provided.
Is provided, and is brought into contact with the resistor 52 by screwing the connector 53. An insertion hole 55 for inserting the head of the ignition plug 54 is formed in the connector 53, and a locking groove 56 and an insertion hole passing through the locking groove 56 and the insertion hole 55 are formed on the outer periphery of the connector 53. A hole 57 is formed, and a locking pin 5 made of an elastic member is provided in the insertion hole 57.
8, the head of the ignition plug 54 is fixed in the insertion hole 55 of the connector 53.

FIG. 6 shows the structure of the plug cap according to the present invention, which will be described with reference to FIG. In FIG. 1A, a resistor 28 connected to an ignition coil 30 is provided in a plug cap 26. The spring connector 29 has a small diameter screw locking portion 29a and a large diameter plug locking portion 29b.
b through the head of the spark plug and the mounting screw 23
Is inserted into the small diameter screw locking portion 29a and screwed to the plug cap 26 to be brought into contact with the resistor 28, and the electrical connection between the resistor 28 and the mounting screw 23 and the head of the ignition plug 17 is established. Configuration. The example of FIG. 2B is an example in which the shape of the mounting screw 23 is different. The plug cap having the above configuration has an advantage that the configuration and processing are simple, and the plug cap is strong against axial and radial vibrations.

[0017]

As described above, according to the present invention, since the heavy ignition coil is supported by the engine via the mounting stay, the vibration can be absorbed and the plug cap can be prevented from coming off. It is easy to replace the spark plug. Further, since the mounting stay extends from the exhaust port to the outside, the mounting stay is cooled by the cooling air of the engine, so that the ignition coil can be cooled.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a mounting structure of an ignition device in a motorcycle according to the present invention.

FIG. 2 is a perspective view of a shroud and a case in FIG. 1;

FIG. 3 is an exploded perspective view of components in FIG. 1;

FIG. 4 is a side view of a motorcycle to which the present invention is applied.

5A and 5B show a conventional plug cap, and FIG. 5A is a cross-sectional view, and FIG. 5B is a cross-sectional view taken along a line BB in FIG.

FIG. 6 is a sectional view showing a plug cap according to the present invention.

[Explanation of symbols]

9 Shroud, 9a, 9b Split shroud, 10 ...
Intake port 11 ... Engine, 16 ... Crankshaft, 17 ... Spark plug 18 ... Cooling fan, 20 ... Exhaust port, 21 ... Spark plug insertion hole 22 ... Mounting stay, 25 ... Ignition coil integrated plug cap 26 ... Plug cap, 27 ... Coil case, 30 ... Ignition coil

Continuation of front page (72) Inventor Shiro Asae 1450-6 Morimachi Moricho, Shichioka Prefecture Moriyama Industry Co., Ltd. (56) References JP-A-62-151760 (JP, A) JP-A-1-147161 (JP A) Fully open sho 57-156012 (JP, U) Fully open sho 60-21567 (JP, U) Full open 2-129771 (JP, U) Full open 1-83129 (JP, U) (58) Survey Field (Int.Cl. ⁶ , DB name) F02P 13/00 F02P 15/00

Claims (1)

(57) [Claims] 1. A cooling fan attached to a crankshaft of an engine, a shroud fixed so as to cover a periphery of the engine, an intake port formed in the shroud,
An ignition in a motorcycle, comprising: an exhaust port and a spark plug insertion hole; a mounting stay formed integrally with the engine and extending to the outside from the exhaust port; and an ignition coil integrated plug cap attached to the mounting stay. Equipment mounting structure.