JPS5974373A - Cover for preventing generator noise in ignition distributor of internal-combustion engine - Google Patents

Abstract

PURPOSE:To prevent noises with a simple structure without increasing manhours for assemblying, by integrally incoporating together both electrically conductive cover for shielding a pick-up coil in a signal generator and resin cover for protecting from high voltage. CONSTITUTION:A generator is attached with a resin cover having therein with fitting holes hooked onto bolts 6 on the generator to prevent the resin cover 1a from coming off. Further, the resin cover 1a is integrally incorporated with a copper cover 1b used as a filter for shielding a pick-up coil 2 against noises from the outside, in the position where the copper cover 1b shields the pick-up coil 2. With this arrangement, noises may be prevented with a simple structure without increasing manhours.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cover for preventing noise from entering a generator used in a non-contact type ignition power distribution device for an internal combustion engine.

Conventionally, brackets, magnets, pickup coils,
There was a problem (1) in that the magnetic circuit, which consisted of a generator made of bolts and a signal rotor, was unable to obtain a regular output waveform due to external noise.

By the way, a resin cover is attached to the above-mentioned generator to protect it from high voltage, but in the present invention, we focused on this point and installed a resin cover so that a part of the conductive cover is attached to the part that covers the Visoqua knob coil. By integrally molding the conductive cover and the conductive cover, a part of the conductive cover acts as a filter to prevent external noise from being applied to the pickup coil, allowing the generator to obtain the original regular output waveform, resulting in a simple configuration. The purpose is to prevent noise, and because it is integrally molded, there is no increase in assembly man-hours.

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

In FIGS. 1 to 4, a resin cover 1a is placed over the generator and is prevented from being removed by being hooked onto a bolt 6, thereby protecting the generator from high voltage falling on it.

■b is a U-shaped copper cover that is molded integrally with the resin cover 1a, and by covering the upper and both sides of the outer periphery of the pickup coil 2 in a U-shape, noise from the outside (2) is prevented. I'll do it like that.

2 is a pickup coil that picks up the magnetic flux of the magnetic circuit and outputs an output waveform.

A bracket 3 is fixed inside the housing 16 of the ignition distributor by screws 14.

4 is a magnet that generates magnetic flux in the magnetic circuit.

A bracket 5 is made of a magnetic material, serves as a path for magnetic flux, and guides the magnetic flux to the pickup coil 2.

Numeral 6 is a bolt that tightens the brackets 3 and 5 and the magnet 4 together.

7 is a signal rotor driven by engine rotation,
The protrusion faces or separates from the bracket l-5 of the generator, thereby changing the amount of magnetic flux passing through the pink-up coil 2.

A rotor 8 is fitted on the same shaft as the signal rotor 7 and rotates in the same manner, and functions to distribute high voltage from an ignition coil (not shown) to the side electrodes 10 of each cylinder of the camp 9.

9 is the cap and the ignition power distribution is done by the clamp 15 (3) It has a side electrode 10 for each cylinder.

10 is a side electrode that supplies high voltage to the spark plug.

14 is the housing 1 of the power distribution device that ignites the generator with a screw.
6 Fix it inside.

A clamp 15 attaches the cap 9 to the housing 16 of the ignition distributor.

In the above configuration, brackets 3 and 5, magnet 4
, a pickup coil 2, a generator consisting of a bolt 6, and a signal rotor 7 driven by rotation from an engine (not shown), and an output waveform is obtained from the pickup coil 2. This waveform is affected by noise magnetic flux from the outside, and there is a problem in that a normal output waveform cannot be obtained.

On the other hand, high voltage from an ignition coil (not shown) is distributed by the power distribution rotor 8 to the side electrodes 10 of each cylinder of the cap 9, but when the distance to the metal parts inside the ignition distributor is short, flashover occurs there. do.

For this purpose, a resin cover la is attached to the generator. This (4) cover 1a has its fitting hole IC connected to the generator bolt 6.
This prevents it from being pulled out.

In the present invention, the resin cover 1a and the copper cover 1b are integrally molded so that the copper cover 1b is attached to the portion of the resin cover 1 that covers the pickup coil 2, and the copper cover 1b acts as a filter to coil the pickup coil. Since external noise is not added to 2, the normal output waveform of the generator can be obtained.

In the embodiments described above, a copper cover was used as the filter, but the same effect can be obtained with a cover made of a conductive material other than the copper cover.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the generator equipped with the cover of the present invention, Fig. 2 is a front view showing the configuration of main parts of the generator shown in Fig. 1, and Fig. 3 is a plan view showing an embodiment of the generator shown in Fig. 1 installed. FIG. 4 is a partially cutaway plan view showing one embodiment of the ignition distributor, and FIG. 4 is a front view of the generator portion viewed from the direction of arrow A shown in FIG. (5) 1a...Resin cover, 1b...Copper cover, 2...
Pink up coil. Representative Patent Attorney Takashi Okabe (6)

Claims (1)

[Claims] In an ignition power distribution device for an internal combustion engine in which a generator is disposed inside the ignition power distribution device and a resin cover for high voltage protection is attached to the generator, a conductive cover that covers a pickup coil of the signal generator and the resin cover are integrated. A molded generator noise prevention cover for ignition distributors for internal combustion engines.