JPS62203976A - Distributor in internal combustion engine - Google Patents

Abstract

PURPOSE:To stabilize the operation of an engine and prevent the generation of afterburning and the vibration of said engine by specifying the relation between each of the contact gaps to a fixed electrode and a movable electrode, of one part of cap side electrodes. CONSTITUTION:A fixed electrode 3 and a movable electrode 2 are provided up and down on a rotatable rotor head 1, and the movable electrode 2 is pulled by a spring 4. Both the electrodes 2, 3 are oppositely provided to the electrodes 5, 5' on the cap side of a distributor, and send a high voltage which is led y the central terminal 5 of the cap 7 side to the electrodes 5, 5' by means of a spark discharge, via a rotor head 1. And, the gap 11 between the end side of one electrode 5' and the fixed electrode 3 is made constant, while a notch 52 with a depth 13 is formed on the end side of the electrode 5' to make a gap 12 between the movable electrode 2 which is moved to the maximum and the electrode 5' smaller than said gap 11. Thereby, when an engine is overly rotated, only one electrode 5' is electrified to carry out reduction in the rotation of the engine with only a part of cylinders.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a power distribution device used for electrical ignition operation for engine drive in an internal combustion engine.

[Conventional technology]

In a conventional power distributor, for example, as shown in FIG. 7, an electrode 3 is fixed to one end of a rotor head l, and one surface of this fixed electrode 3 (one surface at the same height) is connected to the rotor head 1.
At a position opposite to the center of the movable electrode 2, the movable electrode 2 is placed under tension via a tension spring 4 and is opposed to the cap side electrode 5.degree. 5'.

And electrodes 2, 3 and gear on the rotor head.

Too small or too small a contact gap with the side electrode 5.5' will not only change the ignition timing, but also change the closing angle, which will not only cause a significant drop in secondary voltage at high speeds and contact burnout, but also cause damage to the engine. Since this causes an increase in HC and NOx in the exhaust gas, it is necessary to match the correct specified values. Conventionally, when the engine rotation speed increases to a predetermined rotation speed, centrifugal force acts on the movable electrode 2 and stretches the tension spring. The secondary voltage is sent through the movable electrode 2, which is balanced on the outer periphery and close to the cap side electrode, and does not send ignition to the regular cylinder, making it possible to reduce engine speed and prevent engine overspeed. It is now possible to do so.

[Problem that the invention seeks to solve]

However, in a power distributor with such a conventional over-rotation prevention mechanism, the movable electrode is pulled out in the outer circumferential direction by centrifugal force, and the movable electrode is moved to a state narrower than the gap between the fixed electrode 3 and the cap-side electrode 5. Because of this structure, the secondary voltage sent through the center terminal of the gap is transmitted to the electrodes in the narrow gap.

Therefore, if ignition cannot be supplied during the combustion process and the engine overspeeds, all cylinders will fail to ignite, and the fuel that is supplied to the combustion chamber will not be combusted and the engine speed will suddenly drop.In addition, unburned gas will remain in the exhaust manifold. The heat of the exhaust manifold causes combustion and afterburn, and the engine combustion is unstable, which causes excessive engine vibration.

The present invention has been made by focusing on such conventional problems, and it is possible to ignite the exhaust of one or more cylinders when the engine overspeeds, that is, to transmit power from the movable electrode to only some of the cap-side electrodes. The purpose of this is to provide an inexpensive power distribution device using a component wheel, which allows the engine to operate in a stable state without causing afterburn or engine vibration by reducing the engine rotation speed only in some cylinders. That is.

[Means for solving problems]

In the present invention, a flat voltage led to a central terminal on the cap side of a power distribution board equipped with a rotor head serving as a power distribution is sent via the rotor head to a side electrode on the cap side by spark discharge, and is sequentially distributed to each cylinder. In the power distribution device, a fixed electrode and a movable electrode are disposed vertically on the rotor head, and a contact gap corresponding to the fixed electrode and the movable electrode on the rotor head side is formed in a part of the cap side electrode so that the movable electrode is closer to the fixed electrode than the movable electrode. This is a power distributor for an internal combustion engine, characterized in that the gap between the fixed electrode and the movable electrode is larger, and the gap between the movable electrode and the fixed electrode is smaller when the engine is overspeeding.

〔Example〕

The present invention will be explained with examples of FIGS. 1 to 3.
A fixed electrode 3 and a movable electrode 2 are mounted on the rotatable rotor head l.
are arranged vertically, and the movable electrode 2 is set in a tensioned state via a tension spring 4, and both electrodes 2,
3 is placed opposite to the cap-side electrode 5.5' of the switchboard, and a high voltage (
A secondary voltage) is sent via the rotor head 1 to the electrodes 5, 5' in the form of a spark discharge.

The fixed electrode 3 fixed to the rotor head 1 has an electrode tip that distributes power to the cap side electrode 5 or electrode 5' and is arranged above and below at different heights compared to the movable electrode 2 which is movable by centrifugal force. A cap electrode 5 that receives power from the fixed electrode 3.
5' are arranged according to the number of metal parts, that is, electrodes 5.
5' indicates the same height and installation position. Furthermore, movable electrode 2
The cap-side electrode 5', which acts on and receives voltage, is an electrode with a notch 5□ at its tip, and is installed at any cylinder location as required.

In the example shown in FIG. 1, the electrode 5' on the cap 7 side that acts on the movable electrode 2 is only for one cylinder, and if necessary, the position of the cap side electrode 5 on which the fixed electrode 3 acts is for all cylinders. It is installed at the cylinder position, and during engine operation, power is distributed to all cylinders by the fixed electrode 3 through the electrodes 5° 5'. In addition, when the shape of the electrode 5' to which the movable electrode 2 distributes power is changed, it is arranged with one cylinder or multiple cylinders, and each is shown in Figs. 4 to 6.
It is preferable to use the configuration shown in the figure.

Note that these direct effects are such that the number of cylinders to which power is distributed can be selected according to the engine rotation, so that smooth fluctuations in overspeed can be obtained.

That is, in the example shown in FIG. 4, the distal end side of the cap side electrode 5' has a constant gear angle with the fixed electrode 3, and forms a notch 5□ with a depth of 1 to form a gap 12 (movable electrode 2) with the movable electrode 2. 2) and the gap with the cap side electrode 5' when 2 is moved to the maximum) and 1. >Itt is now used in the range.

Also, the example in Figure 5 is 7! , >e, the tip of the electrode 5' is cut off at the slope of the angle θ, and the gap with the movable electrode 2 is 7! It is assumed that t can be changed by an angle θ.

In the specific example of FIG. 6, the gaps lI, l with the corresponding arrangement
This is a type that utilizes the tip side surface and lower end surface of the cap side electrode 5' when the fixed electrode 3 and the movable electrode 2 are disposed opposite each other so as to obtain , and the notch 5□ of the previous example is omitted. Similarly l.

12 can be set by changing the protruding length of the electrode 5'.

The operation of a 6-cylinder engine will be explained by assigning cylinder numbers to the electrodes 5 and 5' provided on the cap 7 (see Fig. 3), that is, the order of power distribution is shown as ■, ■, ■.

Taking as an example a case in which an electrode 5' with a notch 5□ is provided in the 0.0 cylinder of a 6-cylinder engine with a 0.050 order, when a predetermined overspeed is reached, the movable electrode 2 As the force acts, the movable electrode 2 approaches the cap-side electrode 5' and acts on power distribution, but the cap-side electrode has a smaller gap only for the 0th and 0th cylinders, so the rotor hand l
Exhaust ignition occurs only when the movable electrode 2 faces cylinders 0 and 0, and normal ignition occurs when the movable electrode 2 faces other cylinders.

In the above, only the No. 0.0 cylinder was used for exhaust ignition as the electrode in the two-stage processing, but it goes without saying that the number of cylinders for exhaust ignition and the cylinders can be selected as necessary based on the relationship between the output characteristics of the engine and the running performance of the vehicle.

〔Effect of the invention〕

In the present invention, a fixed electrode provided in a rotor head and a movable electrode that moves by centrifugal force are arranged in vertical positions, and a part of the cap-side electrode is arranged so that the movable electrode is larger than the fixed electrode.
By making the movable electrode have a smaller gap than the fixed electrode when the engine overspeeds, the engine vibration in the overspeed prevention mechanism activation range is reduced when power is distributed to a specific cylinder. In addition, it is possible to prevent afterburn caused by excessive unburned gas, and to ensure operability during operation.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of the main part, Figure 2 is a plan view taken along the line ■-■ in Figure 1, Figure 3 is an explanatory plan view, Figure 4 is an enlarged vertical cross-sectional view of the electrode, Figures 5 and FIG. 6 is an enlarged vertical cross-sectional view of the other side of the electrode, and FIG. 7 is a vertical cross-sectional view of the conventional example. ■...Rotor head, 2...Movable electrode, 3...Fixed electrode, 4...Spring, 5.5'...Cap side electrode, 5□...Notch, 6...Center Terminal, 7...
Cap, j! 1゜lt...Gear Tsubu. Figure 5 Figure 6

Claims (1)

[Claims] 1. A high voltage led to the central terminal on the cap side of a power distribution board equipped with a rotor head serving as a power distribution is sent through the rotor head to the side electrodes on the cap side by spark discharge, and is sequentially applied to each side electrode. In a power distributor that distributes power to cylinders, a fixed electrode and a movable electrode are arranged above and below the rotor head, and a contact gap corresponding to the fixed electrode and the movable electrode on the rotor head side is formed in a part of the cap side electrode. 1. A power distributor for an internal combustion engine, characterized in that the gap between the movable electrode and the electrode is larger than that between the electrodes, and the gap between the movable electrode and the fixed electrode is smaller when the engine overspeeds. 2. The power distributor according to claim 1, wherein the cap-side electrode has a different portion in electrical contact with the movable electrode for each cylinder to vary the gap. 3. The power distributor according to claim 1 or 2, wherein the cap-side electrode has a notch or a slope formed by cutting a surface facing the movable electrode or the fixed electrode. 4. Any one of claims 1 to 3, wherein the cap-side electrode is arranged so that its side surface and lower end face are opposed to the fixed electrode and the movable electrode with a gap therebetween, respectively. Distributor as described in Section 1.