JPH01100380A - Electric distributor consolidated with ignition coil for internal combustion engine - Google Patents

Abstract

PURPOSE:To prevent ill influence of leak flux at an ignition coil upon a solenoid pickup by arranging a plate-shaped member consisting of magnetic substance on the solenoid pickup side of ignition coil, and mounting the plate-shaped member on the housing in a single piece with the ignition coil. CONSTITUTION:A shaft 1 is incorporated rotatably in a housing 2, and a signal rotor 3 is fixed in a single piece to the tip of the shaft 1. A solenoid pickup 4 consisting of a field magnet 5 is arranged in position facing the signal rotor 3, and output signal therefrom is fed to an ignition coil 7 through an igniting amplifier 6. In this arrangement, a plate-shaped member 20 consisting of magnetic substance is fastened to the housing together with the ignition coil 7 by screws 30 in the condition in contact with the external surface of ignition coil 7 on the solenoid pickup 4 side. Thereby ill influence of leak flux at the ignition coil upon the solenoid pickup 4 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power distributor integrated with an ignition coil for an internal combustion engine, and particularly to measures for preventing the adverse effects of magnetic flux leakage from an ignition coil.

[Conventional technology]

Miniaturization of ignition systems for internal combustion engines, improvement of installation workability,
In order to improve the reliability of electrical connections between component parts, it has been known that an ignition coil is integrated into the housing of a power distributor (US Pat. No. 3,888
(See specification No. 225).

By the way, when the ignition coil is integrated into the power distributor, there is a possibility that the leakage magnetic flux of the ignition coil may have an adverse effect on the rotation detection device of the power distributor. That is, as shown in Figure 9,
The ignition coil 7 is formed by winding a coil 71 around an iron core 72.
In addition to the main magnetic flux φC, leakage magnetic flux φ is generated when the negative side current is cut off.
If the ignition coil 7 is integrated into the housing 2 of the power distributor, the electromagnetic pickup 4 for detecting changes in performance due to the rotation of the signal rotor 3 will detect noise due to this leakage magnetic flux φ. There is a risk that the negative side current control circuit will malfunction and abnormal ignition will occur.

Therefore, various countermeasures have been proposed to prevent the adverse effects of leakage magnetic flux from the ignition coil.

For example, in JP-A No. 59-65571, a cylindrical member made of a magnetic material is fixed in the housing of a power distributor, and a signal rotor and an electromagnetic The pickup is stored and arranged. Further, in Japanese Patent Publication No. 60-18834, the negative influence of leakage magnetic flux of the ignition coil on the electromagnetic pickup is minimized by appropriately setting the relative positions of the ignition coil and the electromagnetic pickup.

[Problem that the invention seeks to solve]

However, the former conventional example of incorporating a cylindrical member made of magnetic material has the disadvantage of making the power distributor thicker and heavier, and requires parts to fix the cylindrical member. The number of points has also increased. In addition, in the latter conventional example, in which the relative position of the ignition coil and the electromagnetic pickup is set appropriately, the arrangement of various parts within the housing of the power distributor is restricted, resulting in the outer shape of the power distributor having a poor space factor. There was a problem where the

Therefore, an object of the present invention is to provide an ignition coil-integrated power distribution device for an internal combustion engine that can prevent the adverse effects of the leakage magnetic flux of the ignition coil on the electromagnetic pickup without compromising the reduction in size and weight, without restricting the external shape. It's about doing.

[Means for solving problems]

In order to achieve the above object, the present invention provides a power distribution device for an internal combustion engine in which an ignition coil is integrated in a housing.
A plate member made of a magnetic material is disposed on the electromagnetic pickup side of the ignition coil, and the plate member is attached to the housing integrally with the ignition coil.

[Effect]

That is, in the present invention, the leakage magnetic flux of the ignition coil can be controlled by a plate-like member made of a magnetic material that is attached to the electromagnetic pickup side of the ignition coil, and the plate-like member is attached to the nozzle integrally with the ignition coil. Because it is an installation, there is no need to change the thickness or external shape of the power distributor, and the weight and number of parts remain almost the same.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 to 6 are for explaining one embodiment of the present invention, in which Figure 1 is a longitudinal cross-sectional view of a power distributor, and Figure 2 is a cross-sectional view taken along line I-I in Figure 1. , Figure 3 is the output waveform diagram, Figure 4 is the output waveform diagram.
The figure is an exploded perspective view of the main part, FIG. 5 is a side view thereof, and FIG. 6 is an effect explanatory diagram.

In FIGS. 1 and 2, a shaft 1 that rotates in synchronization with the rotation of an external engine is rotatably incorporated into a housing 2, and a signal rotor 3 is assembled at the tip of this shaft 1. , rotates integrally with the shaft 1 within the housing 2. An electromagnetic pickup 4 composed of a pickup coil and a field magnet 5 is fixed at a position facing the signal rotor 3, and the pickup coil detects the amount of change in magnetic flux accompanying the rotation of the signal rotor 3. , its output signal is input to the ignition amplifier 6. The ignition amplifier 6 controls energization from a battery (not shown) to the primary coil of the ignition coil 7 in accordance with the output signal of the electromagnetic pickup 4.

That is, the output waveform of the electromagnetic pickup 4 is shown in FIG.
), the current flowing through the primary coil of the ignition coil 7 is controlled as shown in Fig. 3(b), and when the power from the battery to the primary coil is cut off, a high voltage is induced in the varnished coil of the ignition coil 7. It looks like this. This high voltage is applied to the spark plugs of each cylinder of the engine (not shown) via the rotor head 9 and the electrode 11 fixed to the power distribution character 7'IO.

The plate member 20 made of a silicon steel plate has a thickness of about 1 mm, and is pressed into a frame shape having an opening 21 as shown in FIG. This plate member 2° is attached to the housing 2 together with the ignition coil 7 via a screw 30 while being in contact with the outer surface of the ignition coil 7 on the electromagnetic pickup 4 side.
are jointly tightened. That is, the plate-like member 20 is integrated with the ignition coil 7 in a state in which the bulge 73 of the ignition coil 7, inside which the coil 71 is wound, protrudes from the opening 21.

By the way, although the ignition coil 7 is a closed magnetic circuit type in which a coil 71 is wound around an iron core 72, magnetic flux leaks around the ignition coil 7 when the negative side current is cut off. However, if the plate member 20 made of a magnetic material is attached to the electromagnetic pickup 4 side of the ignition coil 7 as in the above embodiment, the leakage magnetic flux φ8 of the ignition coil 7 is controlled as shown in FIG. ,
The amount of leakage magnetic flux φ blades directed toward the electromagnetic pickup 4 is significantly reduced. Note that φC in FIG. 6 indicates the main magnetic flux of the ignition coil 7.

As described above, since the leakage magnetic flux φl of the ignition coil 7 is controlled by the plate member 20, the leakage flux φl of the ignition coil 7 is prevented from affecting the electromagnetic pickup 4, and the risk of abnormal ignition is prevented. This is a highly reliable power distribution device with no leaks. Also, l mm)! Ej, plate-like member 20 of degree
Since it is simply attached around the bulge 73 of the ignition coil 7, the arrangement of other parts within the housing 2 is not restricted, and therefore there is no need to enlarge the power distributor or change its external shape. Moreover, this plate-like member 20 only needs to be fastened to the housing 2 together with the ignition coil 7, and no special fixing parts are required, so an increase in the weight or number of parts of the power distributor is hardly a problem. There is no need to worry about deterioration of installation workability.

FIG. 7 is a plan view of a plate-like member according to another embodiment of the present invention. In this embodiment, a notch 22 is used as a plate-shaped member made of a magnetic material and attached to the electromagnetic pickup side of the ignition coil.
A substantially C-shaped plate-like member 20 is used. In this way, by providing the notch 22 at a predetermined position of the plate member 2°, it becomes possible to more effectively control the leakage magnetic flux of the ignition coil.

FIG. 8 is a perspective view of a plate member according to still another embodiment of the present invention. In this example, the thickness of the magnetic material is Q, 5.
Two plate-like members 20 having a diameter of less than 1 mm are put together, and this laminate is attached to the electromagnetic pickup side of the ignition coil. In this way, by stacking and using a plurality of plate members 20, it is also possible to more effectively control the leakage magnetic flux of the ignition coil.

Furthermore, according to both of the above embodiments, the heat generated by the ignition coil is quickly transmitted to the housing of the power distributor via the magnetic plate, and this heat can be effectively dissipated from the outer surface of the housing, so that the heat can be effectively dissipated from the outer surface of the housing. Even though the ignition coil is installed in the engine, the temperature in the internal space does not rise that much.
A power distributor can be obtained in which the adverse effect of heat on the ignition circuit unit is reduced.

〔Effect of the invention〕

As explained above, according to the present invention, since the plate member made of a magnetic material is attached to the electromagnetic pickup side of the ignition coil, it is possible to prevent the negative influence of leakage magnetic flux of the ignition coil on the electromagnetic pickup. Moreover, since the plate-like member is attached to the housing together with the ignition coil, there is no need to worry about the power distributor becoming larger or having a restricted external shape, and there is also almost no increase in the number of TLs or the number of parts. Therefore, it is possible to provide an ignition coil-integrated power distributor that is suitable for reduction in size and weight and is highly reliable.

[Brief explanation of the drawing]

Figures 1 to 6 are for explaining one embodiment of the present invention, where Figure 1 is a longitudinal cross-sectional view of a power distributor, and Figure 2 is a cross-sectional view taken along I-I in Figure 1. , Figure 3 is the output waveform diagram, Figure 4 is the output waveform diagram.
The figure is an exploded perspective view of the main part, FIG. 5 is a side view thereof, FIG. 6 is an explanatory diagram of the effect, FIG. 7 is a plan view of a plate-like member according to another embodiment of the present invention, and FIG. FIG. 9, a perspective view of a plate member according to still another embodiment of the invention, is an explanatory diagram showing leakage magnetic flux of an ignition coil. 1... Shaft, 2... Nousing, 3... Signal rotor, 4... Electromagnetic pickup, 6... Ignition amplifier, 7... ...
...Housing, 20...Plate member, 21...
...Screw, φ3...Leakage magnetic flux. Fig. 1 1-Item shaft 7・Tunfire coil 2 Housing sink 20・Core I missing material 3・
Signal rotor 30 ・Screw 4 ・Electric a
C Tsuk 7/tube Figure 2 Figure 3 Figure 4 Figure 7 Ignition coil Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1. A shaft that rotates in synchronization with the rotation of an external engine, a signal rotor that is attached to the shaft and rotates integrally with it, and a signal that is generated by detecting changes in magnetic flux accompanying the rotation of the signal rotor. In the ignition coil-integrated power distribution device for an internal combustion engine, which has an electromagnetic pickup that generates electricity, and has an ignition coil integrated in the housing, a plate-like member made of a magnetic material is arranged on the electromagnetic pickup side of the ignition coil, and the ignition coil is integrated into the housing. An ignition coil-integrated power distribution device for an internal combustion engine, characterized in that a plate member is attached to the housing integrally with the ignition coil. 2. The ignition coil-integrated power distribution device for an internal combustion engine according to claim 1, wherein the plate member made of a magnetic material has a frame-like or ring-like shape. - Body-shaped power distributor. 3. The ignition coil integrated power distribution device for an internal combustion engine according to claim 1, wherein the plate member made of a magnetic material has a substantially C-shaped shape. power distributor. 4. An ignition coil integrated power distribution device for an internal combustion engine according to claim 1, characterized in that a plurality of the plate members made of a magnetic material are laminated. Electric appliances. 5. The ignition coil integrated power distribution device for an internal combustion engine according to claim 1, wherein the magnetic body is formed from a heat conductive member.