JPS6033352Y2 - internal combustion engine ignition system - Google Patents

Description

[Detailed description of the invention] This invention relates to an internal combustion engine ignition system that connects a capacitor forming a resonant circuit to a coil wound around a core facing the signal rotor, and detects ignition timing based on changes in the oscillation state. be.

Conventionally, there has been a device of this type as shown in FIG.

In the figure, 1 is a signal generator installed in a distributor (not shown), and includes a signal rotor 1a that rotates in synchronization with an internal combustion engine (not shown), a core 1b fixed opposite to this signal rotor, and a coil IC wound around this core.
including.

2 is an electronic circuit section located separately from the signal generation section, and coil 1
A capacitor 2a1 which together with c constitutes a resonant circuit; an oscillation energy supply circuit 2b which supplies oscillation energy to this resonant circuit; an oscillation detection circuit 2C which detects the oscillation state of the resonant circuit; an amplifier circuit 2d which amplifies this output signal; Power transistor 2e driven by the output of the circuit
, includes a power supply circuit 2f, 3 is an ignition coil and a primary winding 3a.
It includes a twelfth winding 3b, and 4 is a battery.

Next, the operation will be explained.

The signal rotor 1 is synchronized with the rotation of an internal combustion engine (not shown).
Fig. 2a shows the core 1b facing the signal rotor 1a and the metal part of the signal rotor 1a facing each other as shown in Fig. 2a.
Make the changes shown in

On the other hand, a coil 1c is wound around the core 1b, and a capacitor 2a is connected to the coil 1c, forming a resonant circuit.

This resonant circuit is supplied with oscillation energy from the oscillation energy supply circuit 2b, and is supplied to the resonant circuit at the corresponding location in FIG. A corresponding oscillation waveform appears, and when the metals are facing each other, since the metal is in the magnetic path of the magnetic flux generated by the core IC, the oscillation weakens due to loss in the metal, and the oscillation waveform changes as shown in Figure 2. do.

The oscillation detection circuit 2c always receives the oscillation waveform shown in FIG. 2 as input, and when the oscillation amplitude becomes larger than the comparison voltage shown in FIG. 2, it emits an output signal shown in FIG. 2C.

This output signal is amplified and sent to the primary winding of the ignition coil.
The current shown in Figure d flows, and when this current is cut off, Figure 2
A pulse voltage shown in is generated, producing a high voltage ignition pulse in the secondary winding.

Since the conventional internal combustion engine ignition system is constructed as described above, it is necessary to connect the signal generating section 1 and the electronic circuit section 2 with a lead wire of sufficient length, and the oscillation waveform shown in Fig. 2 is as follows.
Since the high frequency is used to speed up the response, unnecessary radio waves may be radiated from the lead wire, and high voltage ignition pulses may be induced into the lead wire, resulting in malfunction.
There were drawbacks such as reduced reliability of the connection part.

This invention was made to eliminate the drawbacks of the above-mentioned devices, and by integrating the coil and core with the electronic circuit section, the above drawbacks can be eliminated.

Furthermore, at this time, the core is inserted into the frame and fixed, but the frame itself has a recess for arranging the core, and the core is fixed there by potting, etc., which allows for a processing method with high workability and reliability, and is stable. The purpose is to provide an inexpensive and highly reliable internal combustion engine ignition system.

An embodiment of this invention will be described below.

In FIGS. 3 to 7, 1b is a core around which a coil 1c is wound, 2 is an electronic circuit section integrated on a heat sink 10, and 5 is a frame that constitutes a casing together with the heat sink 10, and the core 1b It has a recess 5a into which the coil 1c is inserted and a groove 5b into which the lead wire of the coil 1c is inserted.

Reference numerals 6a and 6b denote terminal plates to which the lead wires of the coil 1c are connected inside the casing, and are connected to the electronic circuit section through relay leads 7a and 7b, respectively.

The operation is the same as that of the conventional example, but the frame 5 constituting the casing has one or more grooves 5b in the recess 5a for inserting and arranging the core 1b, which prevents air bubbles trapped inside during potting. It can be configured to escape through this groove.

By doing so, it is possible to eliminate as much as possible the possibility of core cracking or coil disconnection due to application of thermal stress to the core.

Furthermore, since the grooves 5b are formed in the mold splitting direction during molding, they can be formed very easily.

Furthermore, the frame 5 has terminal plates 6a and 6b, and the coil 1
By connecting the lead wires c to the terminal plates 6a and 6b, respectively, there is no need to worry about damage to the lead wires when transporting the 571b and coil 1c after inserting and assembling them into the frame 5, resulting in extremely high productivity. has.

As described above, according to the present invention, when the core and coil are potted and fixed to the frame, grooves are provided in the frame, so air bubbles trapped inside during potting are quickly eliminated, and the coil can be disconnected due to stress caused by factors such as thermal stress. , we can supply products with stable performance by minimizing core cracking.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a conventional internal combustion engine ignition system, Fig. 2 is a waveform diagram showing operating waveforms, Fig. 3 is a front view showing an internal combustion engine ignition system according to an embodiment of the invention, and Fig. 4 is a sectional view taken along line I-I in Figure 3, and Figure 5 is a cross-sectional view taken along line I-I in Figure 3.
6 is a back view of FIG. 3, and FIG. 7 is a sectional view taken along line I--■ of FIG. 6. 1... Signal generation section, 1a... Signal rotor, 1b... Core, 1c... Coil, 2... Electronic circuit section, 2a...Capacitor, 2b...Oscillation energy supply circuit, 2c
...Oscillation detection circuit, 2d...Amplification circuit, 2e...Power transistor, 2f...
...Power circuit, 3...Ignition coil, 3a...
・・・Primary winding, 3b...Secondary winding, 4・Curve・
Battery, 5... Frame, 5a...
Recess, 5b...Groove, 6a, 6b...
Terminal board, 7a, 7b...Relay lead, 8...
...Grommet, 9a, 9b...Connector,
10...Heat sink, 11...Potting material. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A rotating shaft that rotates in synchronization with internal combustion opening and opening, a signal rotor attached to this rotating shaft, a core attached opposite to this signal rotor, a coil wound around this core, and the above core and coil are inserted. A frame to be fixed, a capacitor and an oscillation energy supply circuit that together with the coil constitute an oscillation circuit, and an ignition timing control circuit section that detects the oscillation state of the oscillation circuit and determines the ignition timing. A recess formed in a part of the recess is provided with a groove in which a core for winding the coil is inserted and a lead wire connecting the coil and the circuit section is housed, and the core is potted and fixed. An internal combustion engine ignition device characterized by: