JP2547198Y2 - Ignition unit for internal combustion engine with indicator light - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an ignition device unit for an internal combustion engine provided with an indicator light for confirming the operation of the ignition device of the internal combustion engine.

[0002]

2. Description of the Related Art Generally, an ignition device for an internal combustion engine controls an ignition coil and a primary current supplied from an ignition power supply to a primary coil of the ignition coil so as to be rapidly changed to an ignition timing.
It comprises a secondary current control circuit and an ignition timing control circuit for controlling the ignition timing according to the rotational speed of the engine, etc., and generates a high voltage for ignition by rapidly changing the primary current of the ignition coil at the ignition timing. Let me.

In this type of ignition device, at least a part of the components of the ignition device is mounted on a printed circuit board to constitute a circuit unit. In order to provide weather resistance, the circuit unit is housed in a unit case. It constitutes an ignition device unit.

In this type of ignition device, in order to be able to confirm the operation of the ignition device at the time of starting and during operation of the engine, an indicator lamp for confirming the operation is housed in a unit case. 2. Description of the Related Art An indicator lamp has been made visible through a viewing hole provided in a part of a unit case.

FIGS. 6 and 7 schematically show the structure of a conventional ignition device unit with an indicator light of this type. In this example, a box-shaped unit case 2 'having a bottom and an upper surface opened.
Inside, a circuit unit 3 'in which an electronic circuit component 14' is mounted on a printed circuit board 13 'is housed, and a cover 32' is attached so as to close an opening of the unit case 2 '. An indicator light 20 'composed of a light emitting diode (LED) or the like is provided to confirm the operation of the ignition device. The light emitting diode 20' is located at a position close to the peripheral wall 8 'of the unit case 2' of the printed circuit board 13 '. It is installed. In order to make the light emission of the light emitting diode 20 'visible from the outside of the unit case 2', a viewing hole 26 'is provided in the peripheral wall portion 8' of the unit case 2 '.

[0006]

In the conventional ignition device unit with an indicator light, the indicator light 20 'is directly mounted on the printed circuit board, and a gap is formed between the indicator light and the viewing hole 26'. . Therefore, when this ignition device is used in an internal combustion engine such as an outboard motor, a snowmobile or a marine jet, which is used in a state where it is easily touched by water, moisture may enter the unit case 2 'through the viewing hole 26'. There is a risk of infiltration and poor insulation of the circuit unit.

The indicator lamp attached to the printed circuit board is arranged in contact with the viewing hole 26 ', and the circuit unit is molded with the resin poured into the case 2' and the indicator lamp 20 'is viewed. Bonded to the periphery of the hole 26 ',
It is also conceivable to prevent water from entering the case 2 'through the viewing hole 26'. However, in this case, it is difficult to bond the indicator light to the periphery of the viewing hole, and the bonding may not be performed sufficiently. Therefore, when the resin is filled in the unit case, the viewing hole 26 'is used. Through the resin. In addition, stress is applied to the indicator light due to thermal distortion of the resin surrounding the indicator light, and the indicator light may be damaged, or the indicator light may be covered with the resin, making it difficult to visually recognize the presence or absence of light emission. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide an ignition device unit for an internal combustion engine with an indicator light, in which the waterproofness of the circuit unit is improved without adversely affecting the visibility of the indicator light and the reliability is improved.

[0009]

According to the present invention, a circuit unit having at least a part of components of an ignition device mounted on a printed circuit board and an indicator light for confirming the operation of the ignition device are provided in a unit case. An ignition device unit for an internal combustion engine with an indicator light, which is housed in a housing and allows the indicator light to be viewed through a peephole provided in a part of the unit case, so that the waterproofness of the circuit unit portion can be enhanced. It was done.

Therefore, in the present invention, the circuit unit storage chamber and the indicator light storage chamber are provided in the unit case in a state of being separated from each other, and the viewing hole is provided in a state of communicating with the display light storage chamber. Then, the circuit unit and the indicator light are housed in the circuit unit housing room and the indicator light housing room, respectively, and the indicator light is connected to the circuit unit by connection means in which a partition wall between the circuit unit housing room and the indicator light housing room is penetrated in a liquid-tight manner. Connect to A resin is filled in the circuit unit storage chamber, and the circuit unit is molded with the resin.

[0011]

With the above construction, the circuit unit is completely molded with the resin in the circuit unit storage chamber, so that the waterproofness is improved. Further, the indicator lamp is housed in the indicator lamp housing room, and is connected to the circuit unit by a connection means having a liquid-tight penetrating partition for separating the circuit unit housing room and the indicator lamp housing room from each other. When the resin is filled, the resin does not leak into the indicator light storage room, stress is applied to the indicator light due to thermal distortion of the resin, and the indicator light is damaged, or the indicator light is covered with the resin and the light is emitted. There is no difficulty in visually recognizing the presence or absence of the presence.

[0012]

1 to 4 show the structure of an embodiment of the present invention. In these figures, 2 is a unit case made of metal or synthetic resin, 3 is a circuit unit,
4 is an indicator light assembly connected to the circuit unit 3,
Reference numeral 5 denotes a wire harness for connecting the circuit unit 3 to other components of the ignition device, and reference numeral 6 denotes a filling resin for molding the circuit unit 3, and these constitute the ignition device unit 1.

The unit case 2 has a bottom wall (see FIG. 2).
The peripheral wall 8 is formed in a box shape having an opening on the lower side, and has a mounting portion 9 projecting outward at each of the squares on the opening side end of the peripheral wall 8. Inside the unit case 2, a circuit unit storage room 11 and an indicator lamp storage room 12 which are separated from each other by a partition 10 are formed.

The circuit unit 3 has a printed circuit board 13 on which electronic circuit parts 14 which are a part of components of an ignition device are mounted. It is arranged in a state of being located near the wall 7 and is fixed to the bottom wall 7 by screws 15. The wire harness 5 collectively connects a large number of conductors 16 led out of the circuit unit 3 to the protective tube 1.
., Constituting the wire harness, a grommet 18 made of rubber which is fitted in a notch 17 formed in a part of the peripheral wall portion 8 of the unit case in a liquid-tight manner. Is drawn out to the outside while penetrating through in a liquid-tight manner.

As shown in FIG. 4, the indicator light assembly 4 includes an indicator light (a light emitting diode in this example) 20 having a pair of lead wires 21 and 21 led out in the same direction, and a pair of the indicator lights 20. A grommet 22 through which the lead wires 21 and 21 penetrate in a liquid-tight manner, insulating tubes 21a and 21a covering the lead wires 21 and 21, and a connector 24 connected to the tips of the lead wires 21 and 21. The indicator light assembly 4 is attached to the unit case by fitting the grommet 22 to the notch 25 formed in the partition 10 in a liquid-tight manner with the indicator light 20 positioned in the indicator light storage chamber 12. ing. The connector 24 includes terminal pins 2 connected to a pair of lead wires 21 and 21, respectively.
The terminal pins are inserted into a socket mounted on the printed circuit board 13 and connected to the circuit unit 3.

In order to allow the light emitted from the indicator lamp 20 to be seen from outside the unit case 2, a peephole 26 is provided through a portion of the bottom wall 7 of the unit case 2 corresponding to the bottom of the indicator lamp storage chamber. ing.

The circuit unit 3 and the indicator light 20 are accommodated in the circuit unit accommodation room 11 and the indicator light accommodation room 12, respectively.
After the connection, the resin 6 is poured into the circuit unit storage chamber 11 from the opening of the unit case 2, and the circuit unit 3 is completely molded (to cover the entire circuit unit) with the resin 6. I have.

In this embodiment, the conductor 1 of the wire harness 5 is used.
6 and the lead wire 21 of the indicator lamp 20 penetrate the peripheral wall portion 8 and the partition wall 10 of the unit case 2 in a liquid-tight manner by the grommet 18 and the grommet 22, respectively. Does not leak out of the unit case 2 or into the indicator light storage room 12.

The above-described ignition device 1 is disposed with an opening of the unit case 2 abutting on an ignition device mounting portion provided on an engine or an operation control panel of the engine or the like. Screwed to the ignition device mounting part.

FIG. 5 is a block diagram showing an example of a circuit configuration of the ignition device for an internal combustion engine. In this example, a portion surrounded by a chain line in FIG. Are provided separately from the ignition device unit.

In the ignition device shown in FIG. 5, an exciter coil E provided in a magnet generator (not shown) which rotates synchronously with the engine is provided.
The primary current supplied to the ignition coil IG by X is controlled by the primary current control circuit 27. The primary current control circuit 27 is a circuit that controls the primary current of the ignition coil to change rapidly at the ignition timing of the engine, and is of various types such as a capacitor discharge type circuit and a current cutoff type circuit. There is. The signal generator PS generates a signal in synchronization with the rotation of the engine. The signal voltage output from the signal generator PS is shaped by a waveform shaping circuit 28 and input to an ignition timing calculating circuit 29. An ignition timing calculation circuit 29 using the battery B as a power source calculates the ignition timing of the engine based on the angular position information and the engine rotation speed information included in the input signal from the waveform shaping circuit 28, and outputs the ignition signal Vi to the calculated ignition timing. Occurs. The primary current control circuit 27 suddenly changes the primary current of the ignition coil IG when the ignition signal is given, and induces a high voltage for ignition on the secondary side of the ignition coil. The ignition operation detection circuit 30 includes a primary current control circuit 27
Operation, for example, detecting charging / discharging of the ignition energy storage capacitor and providing a drive signal to the indicator light drive circuit 31 and outputting the signal from the indicator light drive circuit 31 when the primary current control circuit 27 is operating normally. The indicator lamp 20 emits light.

In the above embodiment, the indicator lamp 20 is made to emit light when the ignition device is operating normally. However, when the operation of the ignition device is stopped or the operation of the ignition device is abnormal. It is also possible to configure so that the indicator light is caused to emit light when the condition is reached.

In the above embodiment, a light emitting diode (LED) is used as the indicator light, but an incandescent light bulb may be used as the indicator light.

In the above embodiment, the ignition coil is arranged outside the unit case. However, the ignition coil can be arranged inside the unit case together with the circuit unit.

[0025]

As described above, according to the present invention, the circuit unit and the indicator lamp are housed in the circuit unit housing room and the indicator lamp housing room which are separated from each other, and the circuit unit housing room is filled with resin. Thus, since the circuit unit is molded, the waterproofness of the circuit unit can be improved.

Further, in the present invention, the indicator lamp is housed in the indicator lamp housing room, and the indicator lamp and the circuit unit are connected by a liquid-tightly penetrating partition for separating the circuit unit housing room and the indicator lamp housing room from each other. Connected, the resin can be prevented from leaking into the indicator light housing room when the resin is filled in the circuit unit housing room, and the indicator light is damaged due to stress applied to the indicator light due to thermal distortion of the resin. There is an advantage that it is possible to prevent the display lamp from being covered with the resin and making it difficult to visually recognize the presence or absence of light emission.

[Brief description of the drawings]

FIG. 1 is a partially cutaway top view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a view showing a main part of the embodiment of the present invention, and is a view in the Z direction of FIG. 2;

FIG. 4 is a front view of the indicator light assembly used in the embodiment of the present invention.

FIG. 5 is a block diagram showing an example of a circuit configuration of the embodiment of the present invention.

FIG. 6 is a top view showing a conventional example with a part cut away.

FIG. 7 is a sectional view taken along line A′-A ′ of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ignition unit 2 Unit case 3 Circuit unit 4 Indicator light assembly 6 Resin 10 Partition wall 11 Circuit unit storage room 12 Indicator light storage room 13 Printed circuit board 20 Indicator light (LED) 26 Viewing hole

Claims (1)

(57) [Scope of request for utility model registration] 1. A circuit unit comprising at least a part of components of an ignition device mounted on a printed circuit board, and an indicator light for confirming operation of the ignition device are housed in a unit case. An ignition device unit for an internal combustion engine with an indicator light, wherein the indicator light is visible through a peephole provided in a part thereof, wherein a circuit unit storage chamber and an indicator light storage chamber are provided in the unit case in a state of being separated from each other. The peephole is provided so as to be communicated with the indicator light storage room. The circuit unit and the indicator light are stored in the circuit unit storage room and the indicator light storage room, respectively. The indicator lamp is connected to the circuit unit by a connection means having a partition wall between the storage unit and the storage unit penetrated in a liquid-tight manner. An ignition device unit for an internal combustion engine with an indicator light, wherein the circuit unit is molded.