JPS6233408A - Ignition coil integrated plug cap - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an ignition coil-integrated plug cap that reduces vibration due to engine vibration.

(Prior art and its problems) Compared to other ignition methods, the capacitive discharge ignition method (CDI method) used in internal combustion engines is capable of increasing the voltage applied to the primary coil of the ignition coil. This has the advantage that the ignition coil can be made smaller and the secondary voltage can be further improved.

However, increasing the secondary voltage in this way increases leakage from the high voltage cord that connects the ignition coil and the spark plug, making it impossible to lengthen the cord, or the insulation of the cord increases. It has the disadvantage that the characteristics must be significantly improved, and furthermore, since the capacitance between this high voltage cord and the ground is added to the capacitance of the secondary coil, the secondary voltage It was also a factor in decreasing the

In order to solve the above problem, an ignition coil integrated plug cap has been proposed in which the ignition coil and the plug cap are integrally formed, thereby substantially eliminating the need for the high withstand voltage cord (for example, 5O-591
93).

However, since this ignition coil integrated plug cap has the ignition coil built into the plug camp, the head tends to be heavy and is easily affected by engine vibration, so it is not possible to attach it to the engine via the spark plug. In this case, it was necessary to sufficiently reinforce the mounting portion, which resulted in high cost, and it took time and effort to attach and detach, reducing work efficiency.

(Object of the Invention) The present invention has been made in view of the above-mentioned points, and provides an ignition coil-integrated plug cap that reduces vibration due to engine vibration.

(Summary of the Invention) In order to achieve the above object, the present invention provides a bobbin around which an ignition coil is wound and which stores an insulating insulator of a spark plug removably over substantially the entire length thereof, and a bobbin at the center of an open end on one side of the bobbin. An output terminal arranged in the ignition coil and connected to the ignition coil and covered with the terminal of the plug, and a cylindrical core fitted inside the bobbin are housed in a case and integrated with an insulating resin member. A seal rubber is molded and the insulating insulator of the plug is inserted and removably inserted into the other open end of the bobbin and the case.

(Example) Hereinafter, one embodiment of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 shows a longitudinal section of an ignition coil integrated plug camp 1 according to the present invention, and the plug camp 1 includes a cylindrical core 2 and a primary coil wound around a bobbin 3 that is fitted onto the core 2. An ignition coil 4 composed of a coil 4a and a secondary coil 4b, a case 5 that accommodates the ignition coil 4 and the core 2, and a seal rubber that fits and fixes the case 5 to the insulating insulator 6a of the spark plug 6. 7.

The core 2 is open at both ends and is inserted and fixed into a deep annular space @3a provided in the axial direction on the peripheral wall of the bobbin 3.

The primary coil 4a and secondary coil 4b of the ignition coil 4 are wound around the bobbin 3, respectively.
One end of each of primary coil 4a and 4b is connected to ground cord 9 via terminal 8, and the other end of primary coil 4a is connected to terminal IO.
The other end of the secondary coil 4b is connected to an output terminal 12 that is fitted and fixed in a hole 3c bored in the axis of the end surface 3b of the bobbin 3.

The bobbin 3 is housed in a case 5, and the end surface of the annular protrusion 3d protruding from the outer surface of the end surface 3b abuts the inner end surface of the case 5, thereby separating and insulating the output terminal 12 from the inner end surface of the case 5. ing.

The bobbin 3 is fixed within the case 5 by an insulating resin member 13. This case 5 has good strength and magnetic properties.
For example, it is made of iron. The cords 9 and 11 are each led out from the open end of the case 5 to the outside of the case, and then laid on the outer peripheral surface of the case 5 along the axial direction to approximately the center of the end surface,
It is guided to a power supply section (not shown). Each of these codes 9,1
1 is fixed to the outer surface of the case 5 by a cord retainer 14.

The seal rubber 7 has a cylindrical shape with a bottom, and a hole 7a into which an insulating insulator 6a of the spark plug 6 is inserted is bored in the center of the bottom end surface. The peripheral edge 7b of the opening end of the hole 7a is internally fitted into the opening end 3d of the bobbin 3, and the peripheral wall 7c is externally fitted into the opening end of the case 5. The insulating insulator 6a of the spark plug 6 screwed onto the cylinder head 15a of the engine 15 is inserted into the bobbin 3 through the hole 7a of the seal rubber 7, and the terminal 6b is press-fitted into the output terminal 12 and electrically connected. The vicinity of the base of the insulating insulator 6a is connected to the hole '7a of the seal rubber 7.
mated to. In this way, the plug cap 1 is fitted onto the spark plug 6.

Engine vibrations are transmitted to the ignition coil-integrated plug cap 1 through the spark plug 6. In this case, since the plug cap 1 is configured to approximately accommodate the insulating insulator 6a of the spark plug 6, the center of mass of the plug cap 1 is approximately at the middle point A of the case 5, and the plug cap 1 and the spark plug 6 are connected to each other. The distance %lt from the joining position of point B
d is located on the engine 15 side. Furthermore, since the plug cap 1 is attached to the insulating insulator 6a via the seal rubber 7, the vibration of the plug cap l is greatly reduced, and the terminal 6b of the spark plug 6 and the output terminal 12 are
This results in better bonding.

Figure 2 shows ignition coil integrated plug cap 1
The engine 15 is attached to the swing arm 18 that holds the rear wheel 17 and is swingable relative to the vehicle body 16, and the ignition coil wiring cord 19 is attached to the pivot shaft 20. The ignition/notion coil-integrated brake knob 1 and the wiring cord 19 are wired through the lower part of the vehicle, and the engine 15 and the engine 15 are surrounded by a vehicle body outer panel 21 provided on the vehicle body 16 and shown by a two-dot chain line.

The ignition coil wiring cord 19 is the primary coil 4
Since it is connected to a, a thin electric wire can be used, and it can be easily bent, so that the wiring can be passed below the pivot shaft 20 as described above, and the swing arm 18 can swing around the pivot shaft 20. Also the wiring code 19
Since the plug cap 1 integrated with the ignition coil is surrounded by the vehicle body outer panel 21 and is not visible from the outside, it is aesthetically superior and effective in terms of protection.

(Effects of the Invention) As detailed above, according to the present invention, there is provided a bobbin around which an ignition coil is wound and which stores an insulating insulator of a spark plug removably over substantially the entire length thereof; An output terminal arranged in the center, connected to the ignition coil, and covered with the terminal of the plug, and a cylindrical core fitted inside the bobbin are housed in a case and integrated with an insulating resin member. The seal rubber, into which the insulating insulator of the plug can be inserted and removed, is integrally fitted to the other end of the bobbin and the case, making wiring easier and preventing engine vibration. It has the advantages of being able to significantly reduce vibration, making it easier to attach to the engine, reducing the need for reinforcement of the mounting part, and making it smaller and lighter.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an embodiment of the ignition coil integrated plug cap according to the present invention, and FIG. 2 shows the ignition coil integrated plug cap shown in FIG.
FIG. 3 is a side view showing an example of a lowered state assembled to a wheeled vehicle. 1...Ignition coil integrated plug cap,
2... Core, 3... Bobbin, 4... Ignition coil, 5... Case, 6... Spark plug, 6a
... Insulating insulator, 6b... Terminal, 7... Seal rubber, 12... Output terminal, 13... Insulating resin member.

Claims (1)

[Claims] 1. A bobbin around which the ignition coil is wound and which stores the spark plug insulation insulator over almost its entire length so that it can be inserted and removed;
An output terminal disposed at the center of one open end of the bobbin, connected to the ignition coil, and capped by a terminal of the plug, and a cylindrical core fitted into the bobbin are housed in a case. An ignition coil characterized in that a seal rubber is integrally molded with an insulating resin member and is integrally fitted to the other open end of the bobbin and the case, into which the insulating insulator of the plug can be inserted and removed. Integrated plug cap.