JPS58162017A - Ignition coil for internal combustion engine - Google Patents

Abstract

PURPOSE:To obtain an ignition coil which is superior in vibration proof and insulation property by forming the primary coil with the main primary coil and auxiliary primary coil and by eliminating external resistor through short-circuit of the auxiliary primary coil at the time of starting the engine. CONSTITUTION:A coil cap 2 is provided with a linear primary coil 6 by providing the flanges 2c-2e to the upper and lower parts of circumference and the interim part of the cylindrical foot part 2a, and simultaneously the primary coil 6 is so configurated that it can be separated into the main primary coil 6a and the auxiliary primary coil 6b where half parts of all number of turns are mutually wound reversely. In addition, the primary terminals provided at the upper side of the coil cap 2 are also provided with the battery terminal 8a in addition to the conventional plus and minus terminals 8b and 8c (+, -) in order to short-circuit the auxilary primary coil 6b at the time of starting the internal combustion engine. Thereby, the same effect can also be obtained as that obtained conventionally by short-circuitting an external resistor. Accordingly, a heavy current flows into the coil (main primary coil 6a) at the time of starting the the engine and high performance can be obtained without absorption of energy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ignition coil for an internal combustion engine, and relates to a structure of a coil cap portion in a IIK iron case type coil.

Conventionally known ignition coils for internal combustion engines mainly use coils with external resistors to improve performance and startability, and when the ignition coil is started, this external resistor is short-circuited to improve the startability of the ignition coil. Ta.

However, with this external resistor, the resistance wire to produce the necessary resistance value is insulated with an insulator such as an insulator, and both ends of the resistance wire are connected to terminals that connect the wire coming from the power supply and the wire going to the coil. By using a circuit that short-circuits this resistor, a large electric wire flows through the coil only at the time of starting, providing back-filling performance, and greatly improving starting performance. However, since the above-mentioned external resistor is required in addition to the coil body, manufacturing costs are high, and problems caused by cracking of the insulator of this external resistor and Due to the presence of the resistor, there were drawbacks such as the installation space for the ignition coil requiring approximately 41i41.

The present invention solves the above-mentioned drawbacks. The purpose of the present invention is to provide a coil cap with a shape that wraps the secondary coil and the central core part inside the cylindrical leg part so as to insulate them from the ground body such as the case. None, a flange is provided above, below and in the middle of the outer periphery of this cylindrical foot, and the main primary coil and auxiliary primary coil are wound between these parts and connected to the primary terminal at the top of the coil cap. The end of the winding of the auxiliary primary coil and the beginning of the winding of the main primary coil, and the end of the winding of the main primary coil to the zero valence of 1* leprosy, and the end of the winding of the main primary coil fixed to the protrusion of the middle 7 flange. The shape has a battery terminal that connects the beginning of the winding and the lead wire connected to the end of the winding of the secondary coil low-voltage couple, and half of the total number of turns of the auxiliary primary coil are wound in opposite directions. This makes it possible to eliminate the IIC spool, which is the foundation of the primary winding, and also to short-circuit between the coil's buffer terminal and the Φ terminal at startup without the need for a conventional external resistor. Only the main primary coil is used, and a large current flows to the main primary coil during starting, providing high performance without energy absorption, improving starting performance, and eliminating the need for an external resistor. The point is to make it.

The ignition coil for an internal combustion engine according to the present invention will be described in detail below according to embodiments.

FIG. 1 is a partial sectional view of an embodiment of an ignition coil for an internal combustion engine according to the present invention, FIG. 2 (4), @ is a partial sectional front view and plan view of the coil cap portion of FIG. 1, and FIG. 1st
FIG. 4 is a front view showing the coil shown in its lowered position before being stored in the case, and FIG. 4 shows an ignition circuit diagram using the coil shown in FIG. 1.

In FIGS. 1 to 8 FIJ, l is an iron case, and g is a coil cap made of high-voltage insulating resin fixed to the case l by closing the open end of the case l by wrapping the open end of the case l. , 3 is a secondary bobbin made of high-voltage insulating resin having a winding groove 3a with an outer circumference of Km and a closing portion 8b at the lower end, and the closing portion 8b is in contact with the inner bottom surface of the case 3. 4 is to be inserted into the secondary bobbin 3 KJ Rikono 1
This is a central core that is insulated from the closed portion 8bK of the next bobbin 8 and placed in the center of the case l. 5 is a secondary coil wound separately in each winding groove 81 of the secondary bobbin 8; 6 is a primary coil placed around the outer periphery of the secondary coil 5; and 7 company coil cap 2.
The secondary terminals, ab and se, fixed in the center of the coil cap 8 are terminals fixed to the coil cap 8, and
is the battery terminal of the primary coil 6. The primary coil 6 is divided into a main primary coil 6a and an auxiliary primary coil 6bK, and the end of the 50th winding of the secondary coil and the beginning of the winding of the auxiliary primary coil 6b are battery terminals 8kK leads-11 islands.

Electrically via 11b! 1! Resolute, secondary coil 60
The beginning of the winding is electrically connected to the secondary terminal 7 via the central core and the plate spring 9'ft, and the end of the winding of the main primary coil 61 is connected to the θ terminal +1b of the other primary terminal with a lead [1].
Electrical Kll! via 10! Continued. Further, the winding end wire of the auxiliary primary coil 6b and the winding start wire of the main primary coil 6a are electrically connected to the terminal 80 of the primary terminal. 10 companies! This screw is used to close the screw hole provided in the next terminal 7 after filling the case l with insulating oil.

The structure of the coil cap 2 is such that the cylindrical leg portion 2a extends toward the bottom of the case l and wraps the secondary coil b and the central core 4 inside the case l so as to insulate them.
The inner part of this cylindrical foot part gm extends toward the secondary bobbin 8, and is fitted to the outer periphery of the tower part 8C at the upper end of this secondary bobbin 8, thereby fixing the secondary bobbin 8 within the case l. A small cylindrical portion 2b is integrally molded. And the cylindrical leg portion 2a
As is clear from the WIJz diagram and Figure 8, the outer periphery of the
7 flange parts 2C22d and 2e are integrally molded at 8 locations at the bottom and the middle part, and these 7 flange parts 2c
A primary coil 6 is wound around the outer periphery of the cylindrical foot part jla between + 2 d g t e, and among these,
It is divided into the main primary coil 6a and the 7 flange part 2a wound between the cr r g 4, and the auxiliary primary coil 6b wound between the 7 flange parts 2c on the top and in the middle.
, gd are integrally molded with protrusions 2g and gh for winding the end of the auxiliary primary coil 6b. Moreover, a protrusion 2f for folding back the auxiliary primary coil 6b in the middle of winding and winding it in the opposite direction is integrally molded on the lower 7 flange part 26. That is, the winding of the auxiliary primary coil 6b wound around the two 7 flange parts ga+ge is wound so that when the first winding is wound clockwise, it crosses over the protrusion tfK of the 7 flange part 2. By turning back and winding the same number of turns as originally wound in the counterclockwise direction, the necessary resistor of the auxiliary primary coil 6b can be secured, and a coil with no inductance can be obtained.

In the circuit shown in Figure 4, if the auxiliary primary coil 6b is only wound in one direction, a closed loop will be formed at the point indicated by the chain double-dashed line at the time of starting, so the performance will drop by 6 to 10 KV only at the time of starting. . As shown in Fig. 6, the magnetic flux F from the main primary coil 6- forms a closed loop in the auxiliary primary coil 6b, so a back electromotive force is generated, and this magnetic flux is absorbed by -6. It will be done. Then, the magnetic flux that interlinks with the secondary coil 5 is distributed in that area, resulting in a decrease in performance.

As a countermeasure, as shown in the 6th FIDK, even if a closed loop occurs in the auxiliary primary coil 6b, the coil portions 6b are wound in opposite directions by winding each half of the winding in opposite directions. ,.

6'b, the -Δ component and the +6 component cancel each other out, and the magnetic flux F emitted from the main primary coil 6a is transmitted to the secondary coil 5 as it is, so the performance does not deteriorate. do not have.

Note that, from the viewpoint of the configuration, even if the vertical relationship between the main primary coil 6a and the auxiliary primary coil 6b is reversed, there is no difference between them.

Furthermore, it goes without saying that the connection relationship between the winding end and the winding start of each coil 516a16b may be reversed.

The cylindrical foot portion ga of the coil cap 2 shall be provided with 7-way portions 2C+ 2d+ 2” on the upper and lower outer periphery and in the middle thereof.
Therefore, in addition to winding the primary coil 6 directly around the coil cap 2, the primary coil 6 is connected to a main primary coil 6, and an auxiliary primary coil 6 in which half of the total number of turns is wound in opposite directions.
In addition, the primary terminal on the upper side of the coil cap 2 is configured so that it can be separated into sb and sc.
By providing the VC and battery terminals 8a in addition to the eθ terminal, the auxiliary primary coil 6bt is
- By short-circuiting the external resistor of the prior art, it has the same cooked rice, and when starting the coil (main 1
A large current flows through the secondary fill 6&), and high performance is obtained at the time of ignition start without energy absorption. At the same time, it is possible to eliminate the primary spool for winding the primary coil 6, and since the 1 high voltage part is completely wrapped in the cylindrical leg part 2, a highly insulating coil can be obtained. Since the primary coil 6 is directly wound around the fixed cap, an ignition coil with excellent vibration resistance can be obtained.

According to the present invention, the battery terminal 8 &
For example, M 4
You can measure the prevention tube by using O, 7 screws and using the previous terminal for the power supply @Fiφ4 connected here, and using M 5 X O08 screws for the other terminals and θ terminals.

Furthermore, the cylindrical leg part 2a of the cylindrical leg part 2 is extended, and a secondary filter assembled around the central core is housed in the inner part of the cylindrical leg part 2a. 7 in between
A bunge portion is provided, during which the K primary fill 6 can be wound, and the primary coil 6 is also configured to be divided into a main primary coil 6a and an auxiliary primary coil 6b, so that the upper side of the coil cap 2 In addition to θ, the primary terminal of the battery terminal 8 &
By providing the auxiliary primary coil 6 at the time of ignition starting,
b (between the ■ terminal and the battery terminal), short-circuiting the external resistor of the conventional technology and flowing a large current to the coil side, to achieve high performance at startup and to reduce the primary filter. The primary spool used to wrap the coil 6 can also be eliminated, which has the advantage of providing an ignition coil with excellent vibration and insulation properties.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of an embodiment of the ignition coil for an internal combustion engine according to the present invention, FIG. FIG. 1 is a front view showing the state of the coil shown in FIG. 1 before it is housed in a case. FIG. 1 uses the coil shown in FIG. 1. ? E-fireway electrical circuit diagram, Figure 6 and Figure 6v! J is an equivalent circuit diagram for explaining the operation of the coil of the present invention. l...case, 2...coil cap, ga...
The cribriform foot part of the coil cap, lk,... The small phloem part of the coil cap, gc, gd, g...Funji part, gf. 2g, j! h...protrusion, 3...secondary bobbin, 4...
... Central core, 5... Secondary coil, 6... L & coil, 6a... Main primary coil, 6b... Auxiliary primary coil, 7... Tertiary terminal, 8a... Buff terminals forming the second terminals, gb, gc...11g1. Primary terminal that forms the third terminal. Representative patent attorney Okabe I

Claims (1)

[Claims] A central core, a tertiary coil disposed around the outer periphery of the central core, an iron case housing these, a cylindrical foot portion enclosing the tertiary coil, and an enclosure that closes an open end of the case; A main primary coil and an auxiliary primary coil are wound separately above and below the outer periphery of the overall coil cap, and an auxiliary primary coil is wrapped around the outer circumference of the coil cap, and one end of the main primary coil is wrapped around the coil cap. ! A terminal connected to the coil cap is connected to one end of the auxiliary primary coil provided in the coil cap, and a terminal connected to the coil cap is connected to the other end of the main primary coil provided in the coil cap. 1
The other end of the secondary coil is connected to the terminal of the round part 3, and half of the total number of turns of the auxiliary primary coil is mutually %/%.
An ignition coil for an internal combustion engine in which the auxiliary primary coil is wound in a reverse direction and the auxiliary primary coil is short-circuited when starting ignition of the internal combustion engine.