JPS6047402A - Signal generating device for internal combustion engine - Google Patents

Abstract

PURPOSE:To realize a compact and lightweight device which is improved in adhesive properties and resistance to vibration and can reduce noises even when the wire is broken on the midway, by winding a bare linear conductive member on the inner or outer periphery of a pickup coil. CONSTITUTION:In a signal generating device for internal combustion engines generating signals for igniting an ignition device for internal combustion engines, a pickup 1 consists of a bobbin 4 with pickup coils 2 of enameled copper wire winding wound thereon; 200-300 turns of bare copper wire 3 having high conductivity and random- or close- wound over the pickup coils 2; and resin 5 for hardening the whole body. Further, the both ends of the copper wire 3 are treated with an adhesive. Even if the breaking of the wire occurs the copper wire 3 remains effective since the adjacent parts of the broken points of the wire are bare and contact is kept with each other. Leakage of magnetic flux from an electromagnetic device outside of a distributor case 10 generates an eddy current flow in the copper wire 3, and by this eddy current, magnetic flux in the opposite direction to the leaked magnetic flux is generated so that the leakage of magnetic flux can be cancelled. Thus, it is enabled to realize a compact and lightweight device which has improved adhesive properties and resistance to vibrations and can reduce noises even when the wire is broken on its midway.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates primarily to a signal generating device for an internal combustion engine for generating an ignition signal for an ignition device for an internal combustion engine.

[Prior art] A conventional technology of this type is disclosed in Japanese Patent Application Laid-Open No. 58-25580.
As described in the publication, a ring-shaped copper plate is installed around the outer periphery of the pickup coil, and an insulated wire with both ends short-circuited is installed to slow changes in magnetic flux applied from the outside due to eddy current loss. Devices that reduce noise are known.

However, in the above-mentioned conventional products, those using ring-shaped copper plates are thick and heavy.
There are problems with installation and vibration resistance, and when using insulated wires, not only do both ends of the insulated wires need to be short-circuited, but if the insulated wires break midway, the thin current will no longer flow, reducing the noise reduction effect. There is a problem that it becomes impossible to obtain.

[Object of the invention] In order to solve the above-mentioned problems, the present invention wraps a bare linear conductive member around the outer or inner circumference of a big amplifier coil, thereby making it small and lightweight, and improving wearability and vibration resistance. It is an object of the present invention to provide an excellent method that does not require connection of wires and can maintain noise reduction effect even if the wires are broken midway.

[Embodiments of the invention] The present invention will be described below with reference to embodiments shown in the drawings.

In Figures 1 to 3, 1 is an electromagnetic type coil, 2 is a pickup coil made of enamelled copper winding of the pickup 1, and 3 is a pickup coil made of an enamelled copper winding of the pickup 1. 4 is a bobbin of the pickup coil 2, and 5 is a molded resin provided to cover the bare copper wire 3. 6 is a power distributor cap, 7 is a power distribution rotor, 8 is a signal rotor, 9 is a centrifugal governor, 10 is a power distributor housing, 11 is a power distributor shaft, 12 is a vacuum advance device, 13 is an iron core of pickup 1, 14 is a magnet.

In the above configuration, the pickup 1 has a pickup coil 2 made of an enamelled copper winding wound around the bobbin 4, and a bare copper wire 3 with high conductivity is wound 200 to 300 times randomly or in close contact on top of the pickup coil 2. Harden with resin 5. According to the experimental results, this bare copper wire 3 has a diameter of 0.05~
Workability is good up to about 1 mm, and the thinner the material, the more compact it can be. Furthermore, both ends of the bare copper wire 3 are
It can be treated with adhesive, and even if there is a break in the wire,
The effect remains the same because both sides are in direct contact.

However, the power outside the ignition distributor! An eddy current flows through the bare copper wire 3 due to the leakage magnetic flux from one device, and this eddy current generates a magnetic flux in the opposite direction to the leakage magnetic flux, thereby canceling out the leakage magnetic flux. This effect is effective when using a non-magnetic material with high electrical conductivity such as copper. Figure 4 shows the main structure of the second embodiment of the present invention.
Grooves 16 are provided along both sides of the flanges of the bobbin 4, and bare copper wire 3 is wound within the grooves 16 as well. By covering almost the entire circumference of the pickup coil 2 with the bare copper wire 3 in this manner, magnetic flux in all directions can be almost completely canceled out.

FIG. 5 shows the main structure of the third embodiment of the present invention.
This embodiment differs from the second embodiment in that a copper plate 17 is fitted in place of the groove 16.

FIG. 6 shows the main structure of the fourth embodiment of the present invention.
A bare vi1 cotton 3 is wound around the inner periphery of the pickup coil 2, and the same effects as in the first embodiment can be obtained. Reference numeral 19 denotes an insulating tape wound around the outer periphery of the pickup coil 2.

FIG. 7 shows the main structure of the fifth embodiment of the present invention.
In contrast to the first embodiment, a bare steel tape 18 is wound instead of the bare copper wire 3.

〔Effect of the invention〕

As described above, in the present invention, since the bare linear conductive member is wound around the outer periphery or the inner periphery of the pickup coil, it is only necessary to wrap the bare linear conductive member. In addition to having excellent vibration resistance,
There is no need to electrically connect both ends of the wire, and the noise reduction effect can be maintained even if the wire is broken midway.

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal and cross-sectional views of an ignition distributor to which the device of the present invention is applied, and Figures 3 (A) and (B) show the main configuration of the first embodiment of the device of the present invention. The longitudinal sectional views and front views shown in FIGS. 4 to 7 are the second to fifth views of the apparatus of the present invention.
FIG. 2 is a longitudinal cross-sectional view showing the configuration of main parts of the embodiment. 2...Pickup coil, 3.18...Bare steel wire and bare copper tape forming a bare linear conductive member. Representative Patent Attorney Takashi Okabe Figure 1 Figure 3 Figure 7

Claims (1)

[Claims] A signal generating device for an internal combustion engine comprising a bare linear conductive member wrapped around the outer or inner circumference of a pickup coil.