JPS5916537Y2 - Ignition distributor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an ignition power distributor in which a dual power distribution simultaneous ignition igniter is built into a housing.

An ignition power distributor used in an engine in which two spark plugs are arranged in a cylinder and power is distributed to these spark plugs simultaneously so that both sparks ignite at the same time is a power transistor for energizing one ignition coil and a power transistor for energizing the other. A power transistor for energizing the ignition coil C1 is provided, and a connection wire between each ignition coil and each power transistor is naturally required.

In this case, if the igniter containing each power transistor etc. is placed in the power distribution housing, the igniter is located near the signal coil, so the current in the connection wire between the igniter and the ignition coil, that is, the external lead wire. The magnetic field generated by the signal coil changes the voltage generated by the signal coil, resulting in erroneous ignition.

This idea eliminates the above-mentioned drawbacks of the conventional method.
The present invention provides an ignition power distribution device that prevents erroneous ignition by mutually canceling out the influence of the magnetic fields of two external lead wires from an igniter to an ignition coil.

An embodiment of this invention will be described below with reference to FIGS. 1 to 4.

In the figure, reference numeral 1 denotes the housing of the power distributor, which is made of aluminum or the like with good heat dissipation.

2 is a rotating shaft supported by this housing 1, 3 is a cylinder loosely fitted to this rotating shaft 2, 4 is a ring-shaped signal rotor fitted to this cylinder 3, and an engine is attached to the outer periphery of the ring-shaped signal rotor. As many protrusions 4a as there are cylinders are formed.

Reference numeral 5 denotes a movable plate which is rotatably supported on the housing 1 around the rotating shaft 2, and a connecting pin 6 is pivotally attached to one place of the movable plate, and a link 7 of the vacuum advance angle device is loosely fitted onto the connecting pin 6. has been done.

A stator 8 is fixed on the movable plate 5 via a permanent magnet 9, and has a protrusion 8a that can face the protrusion 4a of the rotor 4 with a gap therebetween.

10 is a signal unit fixed to the housing 1 via a mounting screw 11 as shown in FIG. 2, and includes a bobbin portion 10a around which a signal coil 10f is wound;
a mounting portion 1 which is integrally molded with the mounting screw 11 and into which the mounting screw 11 is inserted;
0b, an ignition unit 12 which is formed in this mounting portion 10b and will be described later, and an external lead wire 17 which will be described later. Connector part 10C, 10d, 10 for connecting with IJ3゜19
It has e.

As shown in FIG. 3, reference numeral 12 is an ignition unit having a built-in control circuit section 12C (consisting of an integrated circuit or the like) having an ignition circuit function, and a pair of mounting sections 12b having mounting holes 12a. It is joined to the mounting portion 10b of the signal unit 10 and fixed to the housing 1 via the mounting screw 11.

12d and 12e are power transistors for supplying current to the ignition coil 10f via external lead wires 17.18, which will be described later, and 13.14 are power transistors 1, respectively.
Output terminals 2d and 12e connect connector parts 10C and 10, respectively.
connected to d.

15 is a power supply terminal to the control circuit section 12C and the connector section 1
0 Connected to e.

Reference numeral 16 designates a pair of input terminals that are spaced apart from each other in the center of the main body of the ignition unit 12 and protrude in the radial direction;
10 connector terminals (not shown) to connect the signal coil 10f and the control circuit section 12C.

17 and 18 are signal units) 10 connector part 10C
and 10d, respectively, are connected to different ignition coils (not shown), and are disposed on substantially the same plane on opposite sides of the rotating shaft 2, and are taken out in the same direction. It is.

19 is a power line connected to the connector part 10e, 20 is a centrifugal governor advance device, 21 is a power distribution rotor for double power distribution simultaneous ignition fixed to the cylinder body 3 via a mounting screw 22,
a first rotor electrode 21 a, and this first rotor electrode 2
The rotor electrode 21b has a second rotor electrode 21b installed at a radius larger than the installation radius of the rotor electrode 1a.

23 is a power distribution cap fixed to the housing 1;
a is a first peripheral electrode provided on this power distribution cap;
Spark plug (not shown) on one side of cylinder (not shown)
The first rotor electrode 21 a is opposed to the first rotor electrode 21 a so that the first rotor electrode 21 a can be connected to the first rotor electrode 21 a.

23b is a second peripheral electrode that faces the second rotor electrode 21b so that the second rotor electrode 21b can be connected to the other spark plug (not shown).

23C and 23d are the first rotor electrodes 21, respectively.
The first and second center electrodes are in contact with one end of each of the rotor electrodes 21a and 21b, and are connected to an ignition coil (not shown), respectively.

Next, the operation of the embodiment will be explained.

First, when the rotating shaft 2 is rotated by the engine, the cylindrical body 3 is rotated and the signal rotor 4 is rotated, so that the protrusion 4'a and the protrusion 8a of the stator 8 approach, face each other, and separate from each other. Due to the rotational movement of the protrusion 4a of the rotor 4, a change occurs in the interlinkage magnetic flux from the permanent magnet 9, and the signal coil 10
A signal voltage corresponding to the rotational speed is generated at f.

This signal voltage is inputted to a pair of input terminals 16 of the ignition unit 12 via a connector terminal (not shown), and the control circuit section 12C in the ignition unit 12 outputs power transistors 12d and 12e in accordance with the engine ignition timing. , output terminal 13
．． 14, connector part 10C, 10d, external lead wire 1
7. Intermittent the primary current of each ignition coil (not shown) energized through 18 to induce an ignition voltage on its secondary side.

This ignition voltage is applied to the first and second center electrodes 23C, 23d,
Respective spark plugs (not shown) are simultaneously ignited through the first and second rotor electrodes 21a, 21b and the first and second surrounding electrodes 23a, 23b.

Here, the signal coil 10f of the signal unit 10 is the fourth
When a signal voltage as shown in Figure a is generated, the power transistors 12d, 12
When e is turned on, the ignition coil is energized, but the current flowing through one of the external lead wires 17 generates a magnetic field, causing the signal voltage to suddenly drop as shown in FIG.

However, since the other external lead line 18 and the external lead line 17 are located at opposite positions with respect to the rotating shaft 2 and are taken out in the same direction, the external lead line 1
The signal voltage is generated by the magnetic field caused by the current flowing in Figure 4C, as shown in Figure 4C. can be obtained, and false ignition is prevented.

Also, a power transistor 12d is provided in the ignition unit 12.
, 12e are arranged approximately symmetrically on the left and right in the figure as shown in FIG.
The heat generated by e is dispersed to opposite sides and is effectively radiated by the housing 1.

As described above, in this invention, the two external lead wires are arranged on substantially the same plane on opposite sides of the rotation axis, and are taken out from the igniter to the outside of the housing in the same direction. Changes in the signal voltage that would otherwise occur due to the magnetic field caused by the current are prevented, and erroneous ignition can be prevented with an extremely simple configuration, which has practical effects.

[Brief Description of the Drawings] Fig. 1 is a sectional view showing an embodiment of the invention, Fig. 2 is a plan view of the main part of Fig. 1, Fig. 3 is a plan view of the main part of Fig. 1, and Fig. 4 is a plan view of the main part of Fig. 1.
Figures a through 4c are characteristic diagrams showing signal voltages. In the figure, 1 is the housing, 2 is the rotating shaft, 1° is the signal unit l-110a is the bobbin part, 10b is the mounting part, 1
0C, 10d is a connector part, 12 is an ignition unit, 12
b is the mounting part, 12 C is the control circuit part, 12 d, 12
e is a power transistor, and 17.18 is an external lead line. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In an ignition power distribution device, an igniter for simultaneous ignition is arranged between the inner wall of the housing and the rotating shaft, and two external lead wires from the igniter to the ignition coil are routed outside the housing. , an ignition device characterized in that the two external lead wires are arranged on substantially the same plane on opposite sides of the rotation axis, and are taken out from the igniter to the outside of the housing in the same direction. power distributor.