JP2570008B2 - Ignition switchgear with built-in crank angle detector - 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 power distribution device with a built-in crank angle detection device having a function of detecting a crank angle in an ignition power distribution device for supplying a high voltage for ignition.

[0002]

2. Description of the Related Art In general, an ignition distributor for an automobile is provided with a side electrode provided on a distribution cap and a distribution rotor which rotates in conjunction with rotation of an engine, and supplies a voltage to the side electrode from the distribution rotor. By doing so, electricity is distributed.
Further, in order to efficiently use the space in the engine room, a so-called ignition power distribution device with a built-in crank angle detection device incorporating a power distribution device and a crank angle detection device has become common .

[0003] In this ignition distribution device with a built-in crank angle detection device, a large amount of ozone and nitric oxide is generated by spark discharge generated between the distribution rotor and the side electrode, and further, nitric acid which reacts with water is generated. You. The components of the distributor are corroded by the ozone and nitric acid, causing an electric leak, which has a drawback of hindering the function of the distributor.

In order to prevent these problems, a shield cover is provided between the power distribution rotor and the crank angle detecting device, and ozone and nitric oxide generated by spark discharge between the power distribution rotor and the side electrodes are supplied to the crank angle detecting device. I try not to get in. Such a technique is disclosed in, for example, Japanese Patent Application Laid-Open No. 56-83.
No. 569.

However, protection by the shield cover alone is not sufficient. Even if a small amount of ozone or nitric oxide enters the electronic circuit of the crank angle detecting device, the electronic circuit is corroded, and the resistance value changes. Or the wiring breaks. For this reason, the crank angle cannot be accurately detected.

[0006] For this purpose, as disclosed in Japanese Utility Model Laid-Open No. 55-104771, a configuration is known in which a cap is provided with a ventilation path for communicating the inside of a power distributor with the outside air. Further, as described in Japanese Utility Model Application Laid-Open No. 56-147368, in order to improve the efficiency of ventilation, there is known a configuration in which a windbreak plate is provided near a ventilation path provided in this cap. ing.

[0007]

The object of the invention is to be Solved However, the above-mentioned
In the conventional technology, there is a problem that ventilation cannot be performed sufficiently.
Was. This is because the pressure at the exhaust port is not too high,
This is because they do not have enough power. The present invention provides an exhaust port
Pressure to provide a ventilation system with high exhaust capacity.
aimed to.

[0008]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
According to the present invention, the inner peripheral wall of the power distribution device faces the shaft.
Extending radially inward
The windproof plate is provided, and the windproof plate is
A vent was provided on the near side.

[0009]

As described above, according to the present invention, the inside of the power distribution device is
Pressure is generated by pushing into the ventilation opening with the windproof plate extending to the side
Air is generated by the centrifugal force of the rotor.
Strong flow of air around the ventilation openings
Can be made sufficiently higher than the conventional one.

[0010]

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment shown in FIGS. 1 and 2 will be described below. Reference numeral 1 denotes a cup-shaped housing made of an aluminum die-cast forming a power distribution unit main body. Bearings 3 and 4 are provided in the housing 1 and a shaft 2 is supported by a shaft. The shaft 2 is provided with a rotor plate 8 provided with a plurality of slits in a thin disk shape which rotates between a gap 7 between a light emitting diode 5 and a light receiving diode 6 which is a part of a signal generating mechanism. Is fixedly fastened.

A power distribution rotor 11 is mounted on the rotor shaft 10.

The power distribution rotor 11 is electrically connected to a side electrode 13 provided on a cap 12 via a gap. The housing 1 is provided with ventilation paths 14 and 15 for communicating the inside and the outside of the power distributor.

Reference numerals 14a and 15a denote outlets and inlets of the ventilation paths 14 and 15 which open into the power distribution device.

Reference numerals 14b and 15b denote an outlet 14a and an inlet 1
It is a windbreak board installed near 5b.

In the above, the shaft 2 is synchronized with the engine.
Is rotated, the rotor plate 8 integral with the shaft 2 is rotated.
Rotates between the gap 7 between the light emitting diode 5 and the light receiving diode 6, and controls a plurality of slits provided on the circumference of the rotor plate 8 to control an electrical signal to know, for example, the engine speed, the piston position of the engine, and the like. The circuit 16 is formed. This electric signal is combined with a control unit using an external microcomputer (not shown) or the like, which also generates a high secondary voltage in an ignition coil (not shown) and discharges it from the power distribution rotor 11 to the side electrode 13, and an ignition (not shown) Power is supplied to the plug to ignite the mixture in the engine cylinder.

As described above, the shield cover 17 is provided above the control circuit unit 16 so that the control circuit unit 16 does not malfunction due to spark noise due to the discharge of the power distribution rotor 11 and the side electrodes 13.

Here, the ventilation path 14 and the ventilation path 15 are both disposed so as to be located closer to the rotor plate 8 than the power distribution rotor 11, and are disposed at positions having substantially the same radius around the rotation axis of the power distribution rotor 11. Have been.

In the embodiment configured as described above, a large amount of ozone and nitric oxide is generated by the discharge between the power distribution rotor 11 and the side electrode 13, and nitric acid is generated by reacting with water. The components inside the distributor are corroded by the ozone and nitric acid, and the operation of the distributor is obstructed.

Here, the ventilation function in the embodiment of the present invention will be described in detail. The rotating body such as the power distribution rotor 11 swirls the air containing the harmful gas in the power distribution device, guides the air to the windproof plate 14b in which a part of the shield cover 17 is L-shaped, and forcibly ventilates from the outlet 14a. It is discharged to the outside through the passage 14. On the other hand, before the air in the power distribution device passes through the inflow port 15a of the ventilation path 15, the air is guided upward by the windproof plate 15b in which a part of the shield cover 17 is L-shaped,
As shown in FIG. 3, an air flow is created, the flow velocity of the air at the inlet 15a is increased, and fresh external air is forcibly introduced from the inlet 15a by the Venturi effect.

As described above, the ventilation performance can be greatly improved by providing the windproof plate 15b. 4 and 5 show another embodiment. In FIG. 4, 2 which are substantially on the same circumference
Outlet 14a and Inlet 15a of two ventilation paths 14, 15
A windproof plate 15b is provided between them. As shown in FIG. 5, the windproof plate 15b is obtained by bending a part of the shield cover 17 into an L-shape.

As shown in FIG. 5, the fresh air outside is forcibly introduced from the inflow port 15a and the air in the distributor is discharged from the outflow port 14a by the venturi effect of the windbreak plate 15b. As shown in FIG. 4, the air inside the power distribution device makes a round around its axis by the rotation of the power distribution rotor 11. Therefore, since the air in the distributor is discharged while the introduced fresh air makes one circuit, the ventilation performance is further improved in this embodiment.

With the above configuration, ozone and nitric oxide generated by the spark discharge between the power distribution rotor and the side electrodes join the swirling flow near the shield cover and reach the external circuit before reaching the electronic circuit of the crank angle detecting device. Therefore, the ignition distributor with built-in crank angle detection device can be reduced in size while maintaining good ventilation efficiency.

[0024]

As described above, according to the present invention,
Minimize the size of the ignition distribution device with a built-in crank angle detection device while maintaining good ventilation efficiency so that ozone and nitric oxide generated by spark discharge between the distribution rotor and side electrodes are efficiently released to the outside. can do.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a perspective view of a main part of FIG.

FIG. 3 is a diagram showing the flow of air in the vicinity of an intake ventilation path in FIG. 1;

FIG. 4 is a perspective view of a main part showing another embodiment of the present invention.

FIG. 5 is a view showing the flow of air near the ventilation path in FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Shaft, 3, 4 ... Bearing, 8 ... Rotor plate, 10 ... Rotor shaft, 11 ... Power distribution rotor, 12 ... Cap, 13 ... Side electrode, 14, 15 ... Ventilation path, 14a, 15a ... Opening Parts, 14b, 15b: windproof plate, 17: shield cover.

Claims (1)

(57) [Claims] And 1. A shaft supported in the housing, a distribution row data rotated by said shaft, and a cap secured to said forming a side electrode around cover the distribution rotor housing, in the housing a control circuit for detecting a rotational state before Symbol Shah <br/> shift provided, a crank angle detecting apparatus built-in type ignition distributor having a shield cover that is provided between the power distribution rotor and the control circuit In the above, a ventilation path for communicating a space surrounded by the cap and the shield cover and the outside air is opened in an outer peripheral portion of the power distributor.
And a plate-like shape extending radially inward from the inner peripheral wall of the distributor.
Are provided radially, and the ventilation path is opposed to the windproof plate.
And the ventilation port located on the front side in the rotation direction of the power distribution rotor
An ignition power distribution device with a built-in crank angle detection device, wherein the ignition power distribution device includes a crank angle detection device.