JPH04342874A - Ignition device for internal combustion engine - Google Patents

Abstract

PURPOSE:To reduce the size of conformation of the whole of an ignition device by reducing the width of a distribution plate. CONSTITUTION:There are provided plural coil cases 110-140 projected from a distribution plate 100 having portions opposite to ignition plugs of the respective cylinders toward each ignition plug. Plural plate terminals 210-260 are buried in the distribution plate 110 in such a manner that the cross directions are parallel to each other. Each one end of the terminals 210-260 is electrically connected to an ignition coil winding portion in each coil case 110-140.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition system for an internal combustion engine having an ignition coil for each cylinder of the engine.

0002

[Prior Art] Conventionally, in this kind of cylinder head, a cylindrical retaining sleeve is placed in each plug hole of the cylinder head, an external casing is integrally formed, and the outer casing is housed inside each protective sleeve and inside a coil case. There are devices in which each ignition coil is inserted and each ignition coil is connected to a connector via a power distribution plate such as a printed board (for example,
Publication No. 961).

0003

[Problems to be Solved by the Invention] However, in the above-mentioned conventional device, the electrical connection between each ignition coil and the connector is made by multiple conductors formed on a printed board, so that There is a problem in that the more connections there are, the wider the printed board becomes, and the larger the overall size becomes.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to reduce the overall size of the power distribution plate by narrowing the width of the power distribution plate.

[0005]

[Means for Solving the Problems] Therefore, the present invention provides an ignition device for supplying high voltage for ignition to each spark plug disposed in each cylinder of a multi-cylinder internal combustion engine, which A power distribution plate having a portion corresponding to the spark plugs, each coil case protruding from the power distribution plate toward each of the spark plugs, and each ignition coil winding portion housed in the coil case, and the plate width direction is mutually arranged. plate-shaped terminals embedded in the power distribution plate in a parallel positional relationship, one end of which is electrically connected to each of the ignition coil windings; The present invention provides an ignition device for an internal combustion engine, which includes an electrically insulating resin material for fixing and holding each coil winding portion in each coil case.

[0006]

[Operation] As a result, each plate-shaped terminal is buried in the distribution plate with its plate width direction parallel to each other, and one end thereof is electrically connected to each ignition coil winding part, and each terminal is The arrangement interval can be narrowed.

[0007]

[Embodiments] The present invention will be described below with reference to embodiments shown in the drawings. 1 and 2 show a first embodiment of the present invention in which four ignition coils are integrated into a four-cylinder engine, and are made of synthetic resin molded with electrically insulating polybutylene terephthalate (PBT) or the like. Power distribution plate 10 which is a product
0 has a connector portion 150 integrally formed at one end thereof. 4 spark plugs for each cylinder of the engine (not shown)
Four coil cases 110, 1 protrude vertically from the power distribution plate 100 at approximately equal intervals corresponding to the mounting positions of the coil cases 110 and 1.
20, 130, and 140 are arranged.

[0008] Each coil case 110, 120, 130,
140 includes a coil winding portion (not shown) of each ignition coil.
are respectively inserted and held by casting with thermosetting resin 600 having excellent electrical insulation properties, such as epoxy resin.

A plurality of plate-shaped terminals 210, 220, 230, 240, 250, and 260 made of a highly conductive material such as a copper-based alloy are buried in the power distribution plate 100, and are used for ignition signals and battery power. communicate. One terminal 240 is for power supply, and
Another terminal 260 is for secondary coil grounding, and the other terminals are for ignition signals. In this figure, one power supply terminal 240 and one secondary coil grounding terminal 260 are used in common for each of the four coil winding sections.

[0010] Here, focusing on one coil winding section, one end of the primary coil and the secondary coil of the coil winding section is one end 242, which protrudes downward from the power distribution plate 100 of the terminals 240, 260. 262, and the other end of the primary coil is connected to one end 232 of the ignition signal terminal 230 that protrudes downward from the power distribution plate 100. Each of these terminals 240, 260 and 23
The other ends 241 , 261 and 231 of the power distribution plate 100 are disposed to protrude into a connector portion 150 formed at the end of the power distribution plate 100 . The other end of the secondary coil is connected to a metal cap-shaped high voltage terminal (not shown) provided at the lower end of the coil case 110 to transmit high voltage to the spark plug.

In this figure, each coil case 110 to 140 housing each ignition coil is constructed separately from the power distribution plate 100, and is fixed to a metal bracket 500 which also serves as a decorative plate by fixing means 521, 522 such as bolts. ing.

The power distribution plate 100 is integrally formed with not only a connector section 150 for external connection, but also connector sections 151 to 154 for connecting vertically extending coils corresponding to each ignition coil. In addition, each coil case 110 to 140
Connector portions 111 are formed at one end of each ignition coil to house terminals electrically connected to one end and the other end of the primary coil of each ignition coil, and one end of the secondary coil, respectively.

[0013]Then, the coil connection connector part 151~
End portions 212 to 262 of terminals 210 to 260 are disposed to protrude within the connector portion 154 as well as the connector portion 150 for external connection. The power distribution plate 100 is placed between the head of each coil case 110 to 140 and the bracket 500.

Each of the terminals 210 to 260 is embedded in the power distribution plate 100 in a parallel position with the board width direction perpendicular. As a result, the intervals between the terminals 210 to 260 can be narrowed, the power distribution plate 100 can be made smaller, and the ignition device can be integrated without increasing its dimensions, especially in the width direction.

[0015] Reference numeral 101 is a relay terminal inserted into each coil connecting connector part 151 to 154, and electrical connection is established between the ends 212 to 262 of each terminal 210 to 260 and each ignition coil by fitting. It is connected to.

Reference numerals 171 to 174 indicate rubber gaskets forming elastic members, and each coil case 110 to 140
It is sandwiched between the upper surface of the connector portion 111 and the lower surface of the power distribution plate 100, and waterproofs the connector connection portion between the ignition coil and the power distribution plate.

[0017] Then, each ignition coil is attached to a bracket 500.
If the gaskets 171 to 174 are set so that an appropriate compression amount is generated when the power distribution plate 100 is fixed to the bracket 500 side, the power distribution plate 100 receives a pressing force from the gaskets 171 to 174 toward the bracket 500 side.

Therefore, by fixing each ignition coil, not only can the connecting portion be waterproofed, but also the power distribution plate 100 can be fixed, and the assembly work can be simplified. This also reduces the number of fixing screws, etc.

This ignition system is mainly installed between the banks of a double overhead cam engine, and is attached to the cylinder head of the engine (not shown) using bolts or the like through several mounting holes (not shown) provided in the bracket 500. ) is fixed.

The connector section 150 of the coil case 100 is connected to a primary coil signal generation circuit and a battery power source via an external connector (not shown), and is connected to the power distribution plate 10.
Each terminal 210, 220, 230, 2 buried in 0
An ignition signal and a power supply voltage are supplied to the primary coil of each coil winding through 40, 250, and 260. And 1
When an ignition signal is generated to the secondary coil, a high voltage is generated in the secondary coil, and this high voltage is supplied to the spark plug.

FIG. 3 shows a second embodiment of the distribution plate arrangement. In this figure, the power distribution plate 100 is placed on the upper side of each coil case 110 to 140, and as a result, the height of the integrated ignition device can be kept to a few millimeters above the height of the ignition coil head. .

[0022] Also, one end of the primary coil and one end of the secondary coil are commonly connected to one terminal 240 to reduce the number of coils to one.
The reduced number of terminals 210 to 250 are buried in the power distribution plate 100 in a parallel positional relationship with the board width direction being in the horizontal direction.

An internal combustion engine with a large number of cylinders requires a correspondingly large number of buried terminals, but by burying the terminals in the power distribution plate 100 in this way, the width of the ignition system can be reduced to accommodate a large number of buried terminals. It can be kept constant for .

Note that in the example of this figure, each coil case 1
10 to 140 are metal brackets 540 and bolts 52
1,522 etc. is fixed. Also, code 530
is a decorative cover made of resin or metal, and the power distribution plate 1
00 and covers the outer periphery of each ignition coil.

The third embodiment shown in FIG. 4 is one in which a power distribution plate 100 and a cover portion 102 are integrally formed of resin, and is an example of an ignition system for a three-cylinder internal combustion engine or a V6 internal combustion engine.

In this figure, coil connection terminal 2
10 to 240 are embedded in the side portion 100a of the power distribution plate 100, which also serves as a decorative board, with the plate width direction perpendicular, thereby reducing the height (dimension a) of the ignition device.

In this embodiment, the power distribution plate 100 into which the relay terminals 101 have been inserted in advance and the metal bracket 540 to which each of the ignition coil cases 110 to 130 is fixed are temporarily joined by, for example, snap-fitting, and then the power distribution plate 100 is integrated into one body. The ignition system is installed in the internal combustion engine 1000 as shown in FIG.
Attach it with bolts 511, etc.

At this time, since the power distribution plate 100 and the bracket 540 are fastened together, a connection that can withstand vibrations of the internal combustion engine is completed. In the fourth embodiment shown in FIG. 6, the ignition device power distribution part (dimension b) is further miniaturized by making the connector fitting direction between the ignition coil and the power distribution plate 100 horizontal compared to the embodiment shown in FIG. It is something that

A method of assembling this embodiment is shown in FIG. By sliding and coupling the power distribution plate 100 as shown by the arrow, electrical connection between the connector section 150 for external connection and each ignition coil is established via the connector sections 151 to 153 and the relay terminal 101.

[0030]

[Effects of the Invention] Each plate-shaped terminal is buried in the distribution plate with its plate width direction parallel to each other, and one end thereof is electrically connected to each ignition coil winding portion,
Since the spacing between each terminal can be narrowed,
An excellent effect is that the width of the power distribution plate can be narrowed and the overall size can be reduced.

[Brief explanation of the drawing]

FIG. 1(A) is a partially sectional plan view showing a first embodiment of the device of the present invention, and FIG. 1(B) is a partially sectional front view thereof.

FIG. 2 is a partially sectional side view of the first embodiment.

3A is a partially sectional plan view showing a second embodiment of the device of the present invention, FIG. 3B is a partially sectional front view thereof, and FIG. 3C is a partially sectional side view thereof.

4A is a plan view showing a third embodiment of the device of the present invention, FIG. 4B is a partially sectional front view thereof, and FIG. 4C is a partially sectional side view thereof.

FIG. 5 is a partially sectional front view showing how the third embodiment is attached to an internal combustion engine.

6A is a partially sectional plan view showing a fourth embodiment of the device of the present invention, FIG. 6B is a partially sectional front view thereof, and FIG. 6C is a partially sectional side view thereof.

FIG. 7 is a partially exploded front view showing a part of the fourth embodiment.

[Explanation of symbols]

100 Power distribution plate 110, 120, 130, 140 Coil case 21
0,220,230,240,250 Plate terminal

Claims (1)

[Claims] 1. An ignition device for supplying high voltage for ignition to each spark plug arranged in each cylinder of a multi-cylinder internal combustion engine, the power distribution plate having a portion corresponding to each spark plug of each cylinder. and each coil case protruding from the power distribution plate toward each of the ignition plugs, and each ignition coil winding part housed in the coil case, placed in the power distribution plate in a positional relationship parallel to each other in the plate width direction. Each of the plate-shaped terminals is buried and one end thereof is electrically connected to each of the ignition coil windings, and each terminal is injected into each of the coil cases to connect each of the coil windings to each of the coil cases. An ignition device for an internal combustion engine, comprising an electrically insulating resin material for fixing and holding the ignition device in the internal combustion engine.