JPH01110875A - Distributor equipped with overspeed preventing mechanism - Google Patents

Abstract

PURPOSE:To ensure good operation of an engine eliminated in its vibration in a mechanism operational region by constituting a mechanism, when it is in overspeed preventing operation, arranging one end part of a circular arc-shaped electrode plate so as to perform regular ignition for only the predetermined cylinder approaching a cap side electrode and to perform waste ignition for the rest of the other cylinders. CONSTITUTION:A rotor head 1 provides a fixed electrode 2, movable electrode 3 able to move by centrifugal force and relay electrodes 4, 4' limiting a movement of the movable electrode 3. Forming large and small gaps with these relay electrode plates 4, 4' by two circular arc-shaped electrode plates 9, 10, their each one end part is fixedly arranged approaching two oppositely facing cylinder cap side electrodes 8. When a mechanism is in overspeed preventing operation, the one end part of the circular arc-shaped electrode plates 9, 10 performs regular ignition for only either one predetermined cylinder approaching the capside electrode 8 and waste ignition for the rest of all the other three cylinders. As a result, ensuring good operation with no vibration of an engine and a vehicle in a region of the mechanism in its overspeed preventing action, a quiet exhaust sound can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power distribution device that is attached to a four-cylinder internal combustion engine and that operates electrical ignition to prevent overspeeding of the engine.

[Conventional technology]

For example, as shown in FIGS. 3 and 4, a conventional power distributor equipped with an over-speed prevention mechanism has an electrode 2 fixed to one tip of a rotor head l, and one surface of this fixed electrode 2 (the same The movable electrode 3 is set at a position opposite to the center of the rotor head 1 (on one side of the height) in a tensioned state via a tension spring 5, and is opposed to the cap-side electrode 8.

When the engine speed increases to a predetermined overspeed, centrifugal force acts on the movable electrode 3 due to the rotation of the rotor head 1, stretching the tension spring 5, and the movable electrode 3 is balanced on the outer periphery and is positioned toward the camp side. A secondary voltage is sent through the movable electrode 3 close to the electrode 8, and ignition is not sent to the regular cylinder, so that the engine speed can be reduced and overspeed of the engine can be prevented.

[Problem that the invention seeks to solve]

However, in a power distributor equipped with such a conventional overspeed prevention mechanism, when the engine overspeeds, the movable electrode 3
The camp 11
The secondary voltage sent through the center terminal 12 of the engine was sent to the electrodes in the narrow gap, and the cylinders that were in the normal combustion and explosion process could not be ignited, resulting in ignition errors in all cylinders and the voltage being supplied to the combustion chamber. Not only does the fuel not burn, resulting in a sudden drop in engine speed, but it also ignites during a stroke other than normal ignition to all cylinder exhaust or normal ignition timing, resulting in ignition of unburned gas, or unburned gas remaining as it is. It is released into the exhaust manifold, and the heat of the exhaust manifold causes combustion, resulting in afterburn and bank fire.Furthermore, it ignites outside the normal ignition stroke, making combustion unstable and causing excessive engine vibration. there were.

The present invention has been made by focusing on such conventional problems.In a four-cylinder internal combustion engine, when the overspeed prevention mechanism is activated, that is, when a predetermined overspeed has been reached, only one of the four cylinders is activated. The structure is such that the engine can be operated under stable conditions, and there is no backfire, afterburn, or engine vibration in the engine overspeed range, and the exhaust noise is quiet. The purpose of this invention is to provide a power distributor equipped with an anti-rotation mechanism in an inexpensive form with improved reliability.

[Means for solving problems]

The present invention provides a power distributor that is attached to a four-cylinder internal combustion engine and is equipped with a rotor head that serves as a power distributor, and that a high voltage led to a center terminal on the cap side is connected to a cap side electrode that is connected to each cylinder via the rotor head. In the power distributor which is sent to the rotor head and sequentially distributed to each cylinder, a fixed electrode is provided on the rotor head, and a movable electrode that is movable by centrifugal force is disposed on the fixed electrode via a spring, and a relay that restricts the movement of the movable electrode. Further, an arc-shaped electrode plate with one end close to each of the two opposing cap-side electrodes is provided on a fixed part of the power distributor, and the other end of each arc-shaped electrode plate is connected to the rotation of the relay electrode. It has an arc-shaped part inside that is close to the relay electrode,
When overspeed prevention is activated, normal ignition is performed only in one of the predetermined cylinders in which one end of the arc-shaped electrode plate is close to the cap-side electrode, and the remaining cylinders are all ignited in other cylinders. This is a power distributor equipped with an over-rotation prevention mechanism, characterized in that it is configured to prevent over-rotation.

〔Example〕

An embodiment of the present invention will be explained by taking a four-cylinder internal combustion engine with an ignition order of 11 ml-3-4-2 as an example, and referring to FIGS. 1 and 2. A fixed electrode 2 is disposed on the side, and a movable electrode 3 that can slide at 180 degrees is set in a tensioned state via a spring 5, and a high voltage (2 voltage) is applied to the cap side electrode 8 via the fixed electrode 2 that rotates together with the rotor head 1.
The relay electrode 4 that restricts the movement of the movable electrode 3 is connected to the rotor head 1.
It is protruded from the top surface.

On the other hand, there is an insulating cover 7 fixed to the housing 6 inside the housing 6, and when the cap 11 is assembled to the housing 6, one end thereof is close to the cap-side electrode 8 for the opposing 1 m 3.1 m 2 cylinder. Two deformed arc-shaped electrode plates 9 and 10 are fixed to the insulating cover 7. The shape of one arcuate electrode plate 9 is such that when the relay electrode 4 rotates together with the rotor head l, the relay electrode 4 and the arcuate electrode plate 9 are connected at the cap side electrode 8 for the cylinders 1 and 11h3. The air gap is made smaller than the air gap between the fixed electrode 2 and the cap side electrode 8 (Na4.m2) at that time. The shape of the other arc-shaped electrode plate IO is such that when the relay electrode 4 rotates together with the rotor head 1, an air gap between the relay electrode 4 and the arc-shaped electrode plate 10 is formed at the cap side electrode 8 for the cylinder 1lh4. At that time, the fixed electrode 2 and the camp side electrode 8 (Nal
) is smaller than the air gap between the relay electrode 4 and the arc-shaped electrode plate 10 at the cap side electrode 8 for the positive 2 cylinder.
The air gap between the fixed electrode 2 and the camp side electrode (block 3) is made larger than that between the fixed electrode 2 and the camp side electrode (block 3) at that time.

In other words, these arc-shaped electrode plates 9.10 connect the arc-shaped electrode plates 9.1 and the relay electrode 4 (or a part thereof 4').
), the relay electrode 4 is Nal-3-4-
When rotating in the order of 2, 11hl, N113.1lh
It is configured to rotate while having large and small air gaps, such that the near gap is small at magnet 4 and the near gap is large at magnet 2.

The tip of the fixed electrode 2 fixed to the rotor head 1, which distributes power to the camping side electrode 8, is arranged above and below the movable electrode 3, which slides by centrifugal force, at different heights. The cap side electrode 8 that receives power from 2 is 4
The height and installation location are the same for the number of cylinders.

To explain the order of power distribution, first, when the cylinder 11k13.4.2 is ignited, when the rotational speed of the rotor head 1 (A rotation of the engine rotation) reaches a certain overspeed, the movable electrode 3 The force acts to stretch the spring 5, and the movable electrode 3 slides in the circumferential direction and comes into contact with the relay electrode 4.

Then, when the middle m electrode 4 (or 4') faces the arc-shaped electrode plate 9 with a small near gap at PkLl and nu 3 of the camp side electrode 8, ignition occurs in the cylinder of N11L3 (that is, ignition is performed by the fixed electrode 2). The ignition spark for the N14.2 cylinder is dumped into the Hidden 3 cylinder).

Next, the relay electrode 4 (or 4') is connected to the camp side electrode magnetic 4
When facing the arc-shaped electrode plate lO with a small near gap, N
The cylinder a2 is ignited (that is, the ignition spark for the cylinder Nal, which is performed by the fixed electrode 2, is ejected into the cylinder fish 2).

Furthermore, when the relay electrode 4 (or 4') faces the arcuate electrode plate 10 with a large near gap at the second cap side electrode,
Due to the fixed electrode 2, normal ignition is performed in the cylinder 3 even when overspeed is prevented.

In this way, only the third cylinder can be properly ignited, and the other three cylinders can be used for ignition, so that overspeeding of the engine can be prevented.

Note that although the above description is based on the case where the power distribution order is N11-3-4-2, even if the power distribution order changes, the corresponding power distribution is possible.

〔Effect of the invention〕

The present invention provides a rotor head with a fixed electrode, a movable electrode that is movable by centrifugal force, and a relay electrode that restricts the movement of the movable electrode, and two arc-shaped electrode plates that have a gap between them and the relay electrode. One end of each is fixedly arranged close to the cap-side electrode for two opposing cylinders, and one end of the arc-shaped electrode plate is fixedly placed close to the cap-side electrode for two opposing cylinders. By configuring the engine so that only one cylinder is properly ignited and all the other three cylinders are ignited in the other cylinders, there is no engine vibration or vehicle vibration in the overspeed prevention mechanism activation range, ensuring good operation. This ensures that there is no bank fire or afterburn, making the exhaust noise quieter, and since the movable electrode comes into contact with the relay electrode, excessive stress is not generated on the spring during over-rotation, improving reliability. Extremely beneficial effects such as these can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of the main part showing an embodiment of the present invention, Fig. 2 is a plan view taken along the line 1-1 in Fig. 1, Fig. 3 is a longitudinal sectional view of the conventional example, and Fig. FIG. 1... Rotor head, 2... Fixed electrode, 3...
Movable electrode, 4, 4'... Relay electrode, 5... Spring, 6... Housing, 7... Insulating cover, 8...
・Cap side electrode, 9.10...Circular electrode plate, 11
...Camp, 12...Central terminal.

Claims (1)

[Claims] (1) A high voltage led to the central terminal on the cap side of a power distributor installed in a 4-cylinder internal combustion engine and equipped with a rotor head that serves as a power distributor passes through the rotor head to the cap side electrodes connected to each cylinder. A fixed electrode on the rotor head in a power distribution device that distributes the power to each cylinder sequentially;
A movable electrode that is movable by centrifugal force is provided on the fixed electrode via a spring, a relay electrode is provided to restrict the movement of the movable electrode, and an arc-shaped electrode is provided with one end close to each of the two opposing cap-side electrodes. The plate is disposed at a fixed part of the power distributor, and the other end of each arc-shaped electrode plate has an arc-shaped part that approaches the relay electrode during rotation of the relay electrode, and the arc-shaped electrode It is characterized by a structure in which normal ignition is performed only in one of the predetermined cylinders whose one end of the plate is close to the cap side electrode, and all remaining cylinders are ignited in other cylinders. A power distributor equipped with an overspeed prevention mechanism.