JP2871155B2 - Ignition device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In this kind of the related art, a cylindrical holding sleeve is disposed in each plug hole of a cylinder head to form an external casing integrally, and is housed in a coil case in each protective sleeve. Insert each ignition coil,
Some ignition coils are connected to a connector via a power distribution plate such as a printed board (for example, Japanese Patent Application Laid-Open No. 60-50 / 1985).
1961).

[0003]

However, in the above-described conventional device, the electrical connection between each ignition coil and the connector is performed by a plurality of conductors formed on a printed board, so that each part is electrically connected. As the number of connections increases, there is a problem that the width of the printed board increases and the overall physique increases.

Therefore, an object of the present invention is to reduce the width of the distribution plate to reduce the overall size.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention is directed to an ignition device for supplying a high voltage for ignition to each ignition plug arranged in each cylinder of a multi-cylinder internal combustion engine, wherein each of the cylinders has A power distribution plate having a portion corresponding to the ignition plug, each coil case projecting from the power distribution plate toward each of the ignition plugs, each ignition coil winding portion housed in the coil case, and A plate-like terminal that is embedded in the power distribution plate as a parallel positional relationship, one end of which is electrically connected to each of the ignition coil winding portions, and is injected into each of the coil cases, It is an object of the present invention to provide an ignition device for an internal combustion engine comprising: an electrically insulating resin material for fixing and holding each coil winding portion in each of the coil cases.

[0006]

As a result, each plate-like terminal is embedded in the power distribution plate with its plate width direction parallel to each other, one end of which is electrically connected to each ignition coil winding, and The arrangement interval can be narrowed.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIGS. 1 and 2 show a first embodiment of the present invention in which four ignition coils are integrated with a four-cylinder engine, and a synthetic resin such as polybutylene terephthalate (PBT) having electrical insulation properties is formed. Distribution plate 10
Reference numeral 0 denotes a connector part 150 integrally formed at one end. 4 spark plugs for each cylinder of the engine (not shown)
Four coil cases 110, 1 projecting in the vertical direction at substantially equal intervals from the distribution plate 100 corresponding to the mounting positions of
20, 130 and 140 are arranged.

Each of the coil cases 110, 120, 130,
Inside 140 is a coil winding part (not shown) of each ignition coil.
Are inserted, and are held by casting a thermosetting resin 600 having excellent electric insulation such as an epoxy resin.

A plurality of plate-like terminals 210, 220, 230, 240, 250 and 260 made of a material having excellent conductivity such as a copper-based alloy are embedded in the distribution plate 100, and an ignition signal and a battery power supply are provided. To communicate. One terminal 240 is for power supply,
The other terminal 260 is for the secondary coil ground, and the other is for the ignition signal. In the figure, one power supply terminal 240 and secondary coil ground terminal 260 are commonly used for the four coil winding portions.

Here, one coil winding part will be described. One end of the primary coil and one end of the secondary coil of the coil winding part are connected to one end 242 protruding downward from the power distribution plate 100 of the terminals 240 and 260. 262, and the other end of the primary coil is connected to one end 232 of the ignition signal terminal 230 projecting downward from the power distribution plate 100. These terminals 240, 260 and 23
The other ends 241, 261, and 231 are protrudingly arranged in the connector 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 for transmitting a high voltage to the ignition plug.

In this figure, each coil case 110-140 accommodating each ignition coil is formed separately from the power distribution plate 100, and is fixed to a metal bracket 500 also serving as a decorative plate by fixing means 521 and 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 coil connection which extend vertically corresponding to the respective ignition coils. Moreover, each coil case 110-140
Also, one end of the primary coil of each ignition coil and the other end thereof are each formed with a connector section 111 for accommodating each terminal electrically connected to one end of the secondary coil.

Then, the coil connecting connector portions 151 to 151
Ends 212 to 262 of the terminals 210 to 260 are also protrudingly arranged in the 154 similarly to the connector part 150 for external connection. The power distribution plate 100 is arranged between the heads of the coil cases 110 to 140 and the bracket 500.

Each of the terminals 210 to 260 is buried in the distribution plate 100 in a side-by-side vertical and parallel positional relationship. As a result, the arrangement intervals of the terminals 210 to 260 can be reduced, the power distribution plate 100 can be reduced in size, and the igniter can be integrated while suppressing an increase in dimension particularly in the width direction.

Reference numeral 101 denotes a relay terminal inserted into each of the coil connection connector portions 151 to 154, and ends 212 to 262 of the terminals 210 to 260.
And each ignition coil is electrically connected by fitting.

Reference numerals 171 to 174 denote rubber gaskets as elastic members.
Is sandwiched between the upper surface of the connector portion 111 and the power distribution plate 100 and the lower surface to waterproof the connector connecting portion between the ignition coil and the power distribution plate.

Then, each ignition coil is mounted on a bracket 500.
If the gaskets 171 to 174 are set so as to generate an appropriate compression allowance when fixed to the power supply plate 100, the power distribution plate 100 receives a pressing force from the gaskets 171 to 174 toward the bracket 500.

Accordingly, by fixing each ignition coil, not only the connection portion can be waterproofed but also the power distribution plate 100 can be fixed, and the assembling operation can be simplified. This also reduces the number of fixing screws and the like.

The ignition device is mainly mounted between the banks of the double overhead cam engine, and is provided with a plurality of mounting holes (not shown) provided in the bracket 500 by bolts or the like to use a cylinder head (not shown) of the engine. ).

The connector section 150 of the coil case 100
Is connected to a primary coil signal generation circuit and a battery power supply via an external connector (not shown),
00 each terminal 210,220,230,
Through 240, 250 and 260, one of the coil windings
The ignition signal and the power supply voltage are supplied to the next coil. And
When an ignition signal is generated in the primary coil, a high voltage is generated in the secondary coil, and this high voltage is supplied to the ignition plug.

FIG. 3 shows a second embodiment of the distribution plate arrangement. In this drawing, the power distribution plate 100 is disposed on the upper side of each of the coil cases 110 to 140, so that the height of the integrated ignition device can be suppressed to about several millimeters from the height of the ignition coil head. .

Further, one end of the primary coil and one end of the secondary coil are commonly connected to one terminal 240 to reduce the number thereof to one.
The reduced terminals 210 to 250 are buried in the power distribution plate 100 in a parallel positional relationship in the horizontal direction of the plate width direction.

For an internal combustion engine having a large number of cylinders, a large number of buried terminals is required. However, by embedding the terminals in the power distribution plate 100, the width of the ignition device can be increased to increase the width of the engine having a large number of cylinders. Can be kept constant.

In the example shown in FIG.
10 to 140 are bolts 52 on a metal bracket 540.
1, 522 and the like. Also, reference numeral 530
Is a resin or metal decorative cover, and the distribution plate 1
00 and the outer circumference of each ignition coil.

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

In this figure, a coil connection terminal 2 is shown.
10 to 240 are buried in the side portion 100a of the distribution plate 100 which also serves as a decorative plate, with the plate width direction being vertical, so that the height (dimension a) of the ignition device is reduced.

In this embodiment, the power distribution plate 100 in which the relay terminals 101 are inserted in advance and the metal bracket 540 to which the ignition coil cases 110 to 130 are fixed are temporarily connected by, for example, snap-fitting. As shown in FIG.
Is mounted on the base with bolts 511 or the like.

At this time, since the power distribution plate 100 and the bracket 540 are fastened together, a connection that can withstand the vibration of the internal combustion engine is completed. The fourth embodiment of FIG. 6 further reduces the size of the power distribution portion (dimension b) of the ignition device by making the connector fitting direction of the ignition coil and the power distribution plate 100 horizontal with respect to the embodiment of FIG. It is a thing.

FIG. 7 shows an assembling method of this embodiment.
By sliding and connecting the distribution plate 100 as shown by the arrow, the electrical connection between the external connection connector 150 and each ignition coil is performed via the connectors 151 to 153 and the relay terminal 101.

[0030]

According to the present invention, each plate-like terminal is buried in the distribution plate with its plate width direction being in a parallel positional relationship to each other, and one end thereof is electrically connected to each ignition coil winding portion. Since the interval can be reduced, there is an excellent effect that the width of the power distribution plate can be reduced to reduce the overall size.

[Brief description of the drawings]

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

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

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

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

FIG. 5 is a partial cross-sectional front view showing a mounting state of the third embodiment to an internal combustion engine.

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

FIG. 7 is a partial sectional front view showing a part of the fourth embodiment in an exploded manner.

[Explanation of symbols]

REFERENCE SIGNS LIST 100 distribution plate 110, 120, 130, 140 coil case 210, 220, 230, 240, 250 plate-shaped terminal 600 thermosetting resin as electrically insulating resin material

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F02P 15/00 303 F02P 13/00 303 H01F 38/12

Claims (1)

(57) [Claims] An ignition device for supplying a high voltage for ignition to each ignition plug disposed in each cylinder of a multi-cylinder internal combustion engine, comprising: a distribution plate having a portion corresponding to each ignition plug of each cylinder. And each coil case projecting from the power distribution plate toward each of the ignition plugs, each ignition coil winding portion housed in the coil case, and a plate width direction in the power distribution plate in a parallel positional relationship to each other. Each plate-shaped terminal is embedded and one end of which is electrically connected to each of the ignition coil winding portions, and each of the coil cases is injected into each of the coil cases. An ignition device for an internal combustion engine, comprising: an electrically insulating resin material for fixing and holding the inside.