JPS584911A - Ignition coil for internal-combustion engine - Google Patents

Abstract

PURPOSE:To prevent damage to a bobbin due to soldering heat and allow a high-voltage terminal to be reliably fixed, by a method wherein a secondary coil constituting an ignition coil is wound on a plastic bobbin, and a high-voltage terminal to be provided thereon is disposed on an end surface part of the bobbin. CONSTITUTION:A projection 4a for mounting a high-voltage leading element is provided at one end on the outer periphery of a plastic bobbin 4 having a plurality of winding grooves formed on its outer periphery. A secondary coil 5 is wound on the winding grooves of the bobbin 4, and lead wires 7 and 6 are led out from the starting end and the terminating end of the winding, respectively. Then, a mounting hole 1 is bored in the projection 4a provided on the bobbin 4, and a cylindrical part 2b of a metal plate 2 stamped out into a cylindrical shape is press-fitted into the mounting hole 1. Then, the lead wire 6 is soldered to a tongue-shaped projecting part 2a provided to the plate 2. Thereafter, a high-voltage terminal 3 having a knurled part 3a at its root is press-fitted into the cylindrical part 2b of the plate 2, thereby obtaining a reliable electrical contact without causing the bobbin 4 to be melted or carbonized.

Description

[Detailed description of the invention] Regarding good.

The secondary winding of the conventionally known ignition coil for internal combustion engines is wound in insulating paper, and the lead wire at the end of the winding of the secondary winding is soldered to a high-voltage terminal and then adhered to the outermost layer of the insulating paper. It was fixed with tape.

However, in the conventional well-known structure described above, the high-voltage terminus μ is taped on the secondary insulating paper, which not only increases the number of man-hours but also prevents the tape from forming during the subsequent work such as carp μ impregnation. The problem is that the high voltage terminal y is peeling off and moving apart.

In order to solve the above-mentioned problems, the present invention adopts a structure in which a secondary carp is wound on a differential stick bobbin, and a high-pressure terminal is disposed on the end face of the bobbin.

In addition, the structure of the present invention is constructed by providing each of the characteristic parts of the above 3m class, and the soldering of the secondary lead wire prevents the plastic bobbin from melting or carbonization due to heat, and provides a more reliable high-pressure terminal. The aim is to fix μ.

II) A mounting hole for a high-voltage draw-out part located on the high-voltage side end face of the coin bobbin; 12) A tongue that is stamped into a cylindrical shape and can be press-fitted into the hobbin's mounting hole and a secondary draw-out wire can be soldered thereto. 13) A high-pressure terminal having a low-left processing portion that is press-fitted into the cylindrical portion of the metal plate, and has a threaded tip portion.

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

In FIG. 1, numeral 4 is a plastic bobbin having a plurality of winding grooves on its outer periphery, and 4a is a protrusion for attaching a resonant voltage extraction component located on the high voltage side end surface of bobbin 4. Reference numeral 2 denotes a metal plate, and 3 a high-voltage terminus μ. The tip of the high-voltage terminal lv3 is threaded and serves as a location for attaching a high-voltage cord (not shown). 5 is bobbin 40
The secondary coil is wound around the winding groove, 6 is a secondary winding end lead-out line, and 7 is a secondary winding start lead-out line.

FIG. 2 shows the configuration of the high-pressure draw-out section. In Figure 2,
A cylindrical portion 21) of the metal plate 2 is press-fitted into a hole 1 provided in the protruding portion 4a, and a secondary winding end portion is inserted into the tongue-like protrusion 2a provided on the metal plate 2. Solder 6 to the drawer. Thereafter, the high voltage terminal/I/3 is press-fitted into the cylindrical portion 2b of the metal plate 20 and fixed. still,
The base of the high voltage terminal lv3 has a low left processed portion 3a, and by press-fitting the low left processed portion 3a into the cylindrical portion 2b, smooth and secure press-fitting of electrical contact can be achieved.

In this way, the secondary lead wire 6 is connected to the metal plate 2 (%).
If a configuration is adopted in which components with small heat capacity are soldered in advance, the high-pressure terminal 3 can be more securely fixed because soldering may cause the plastic bobbin 4 to melt or carbonize at times.

In the above embodiment, the high voltage terminal is disposed on the end face of the secondary bobbin 4, but the end face of the primary bobbin may be used if an increase in the axial dimension is taken into consideration.

The cylindrical portion 2b of the metal plate 20 may be press-fitted into the crest hole l after soldering the tongue-like protrusion 2alζ of the metal grate 2 and the secondary winding end wire 6.

As described above, in the present invention, the secondary carp μ is wound around a plastic bobbin, and the end face of the bobbin is utilized, that is, the high voltage terminal is placed in the southern part of the bobbin end. As a preparation, a crested hole is provided on the high-pressure end surface of the reed hobbin, a metal plate is press-fitted into the hole, and a secondary high-voltage lead-out line is soldered to the metal plate.
After that, the high voltage terminal was press-fitted into the cylindrical part of the metal plate, and the secondary lead wire was soldered to a small part of the pot like the metal plate. This has an excellent effect of preventing damage to the bobbin due to the above-mentioned method, and making it possible to more reliably fix the high-pressure terminal.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing an embodiment of the main structure of a coil according to the present invention, and FIG. 2 is an exploded partially sectional front view showing a high voltage extraction portion in the above embodiment. l...Crest hole of high pressure drawer part, 2...Metal plate, 2a...tongue-like projection, 2b...cylindrical part, 3
. . . High pressure terminal ~, 3a . . . Low left processing part, 4 . . . Plastic bobbin with multiple winding grooves,
5...Secondary carp~, 6...Secondary winding end lead line as a secondary lead line. Agent FF Physician Takashi Mabe 1 Figure-39-

Claims (1)

[Claims] A mounting hole for a high-voltage lead-out component provided in a portion located at the high-voltage end of the coil pobbin, a cylindrical part stamped into the FJfli shape and press-fitted into the mounting hole of the bobbin, and a tongue to which a secondary lead-out wire is soldered. A metal plate having a protrusion, and a lorry whose base part is knurled and press-fitted into the cylindrical part of the metal plate. ) has a processed part,
Ignition carp μ for internal combustion engines equipped with a high-pressure terminal whose tip is threaded.