JPH0226770B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention mainly relates 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] As a conventional technology of this kind, there is a
As described in Publication No. 25580, a ring-shaped copper plate is installed around the outer circumference of the pick-up coil,
It is known to reduce noise by installing an insulated wire with both ends short-circuited to slow changes in magnetic flux applied from the outside due to eddy current loss.

However, in the conventional method mentioned above,
Those that use a ring-shaped copper plate are large and heavy, and have problems with mounting and vibration resistance, and those that use insulated wires not only require short-circuiting at both ends of the insulated wire. There is a problem in that if the insulated wire is disconnected midway, eddy current will no longer flow, making it impossible to obtain a noise reduction effect.

[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 pickup coil, thereby achieving a pickup coil that is small and lightweight, has excellent wearability and vibration resistance, and It is an object of the present invention to maintain a noise reduction effect even if the wire does not need to be connected and is broken in the middle.

[Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIGS. 1 to 3, 1 is an electromagnetic pick-up, 2 is a pick-up coil made of enamelled copper winding of the pick-up 1, and 3 is a bare copper wire wound randomly or tightly around the outer periphery of the pick-up coil 2. 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 distribution cap, 7 is a power distribution rotor, 8 is a signal rotor, 9 is a centrifugal governor, 10 is a power distribution housing, 11 is a power distribution shaft, 12 is a vacuum advance device, 13 is an iron core of pick-up 1, 1
4 is a magnet.

In the above structure, the pick-up 1 has a bobbin 4 wound with a pick-up coil 2 made of enamelled copper winding, and a bare copper wire 3 with high conductivity on top of the pick-up coil 2.
Wrap it 200 to 300 times randomly or closely, and harden the whole thing with resin 5. According to experimental results, the bare copper wire 3 has good workability when it has a diameter of about 0.05 to 1 mm, and the thinner the wire, the more compact the wire can be. Furthermore, both ends of the bare copper wire 3 are glued together.
This process is possible, and even if there is a break in the wire, the effect remains the same because both sides are in bare contact.

As a result, an eddy current flows through the bare copper wire 3 due to leakage magnetic flux from an electromagnetic device outside the ignition distributor, 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 most effective when a non-magnetic material with high electrical conductivity, such as copper, is used.

FIG. 4 shows the main structure of a second embodiment of the present invention, in which grooves 16 are formed along both sides of the bobbin 4.
is provided, and a bare copper wire 3 is also wound within this groove portion 16. Pick up coil 2 like this
By covering almost the entire circumference with bare copper wire 3, magnetic flux in all directions can be almost completely canceled out.

FIG. 5 shows the main structure of a third embodiment of the present invention, in which a copper plate 17 is fitted in place of the groove 16 in the second embodiment.

FIG. 6 shows the main structure of a fourth embodiment of the present invention, in which a bare copper wire 3 is wound around the inner circumference of a pickup coil 2, and the same effect as in the first embodiment is obtained. can get. 19 is pick up coil 2
It is an insulating tape wrapped around the outer circumference of the

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

〔Effect of the invention〕

As described above, in the present invention, since the bare linear conductive member is wound around the outer or inner circumference of the pick-up coil, it is only necessary to wrap the bare linear conductive member. It has excellent vibration resistance, does not require electrical connection at both ends of the wire, and has the excellent effect of maintaining the noise reduction effect even if the wire is disconnected midway.

[Brief explanation of drawings]

Figures 1 and 2 are longitudinal and cross-sectional views of an ignition distributor to which the device of the present invention is applied, Figure 3A,
B is a longitudinal cross-sectional view and a front view showing the configuration of main parts of the first embodiment of the device of the present invention, and FIGS. 4 to 7 are longitudinal cross-sections showing the structure of main parts of the second to fifth embodiments of the device of the present invention It is a diagram. 2... Pick-up coil, 3, 18... Bare copper wire and bare copper tape forming a bare linear conductive member.

Claims (1)

[Claims] 1. A signal generator for an internal combustion engine comprising a bare linear conductive member wrapped around the outer or inner circumference of a pick-up coil.