JPS5826511Y2 - Bobbin for high pressure generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a bobbin used, for example, in a high voltage generator for generating a high voltage applied between ignition electrodes.

In a high voltage generator, when the secondary coils that generate high voltage are wound together in a single winding groove, line-to-line discharge occurs due to the high voltage generated between several turns.

In order to prevent this line-to-line discharge, a bobbin 1 as shown in FIG. 1 is used.

This bobbin 1 has a plurality of winding grooves 4a to 4 by providing a plurality of shielding walls 3a to 3e on the circumferential surface of a cylindrical winding core 2.
d, and the coil for high voltage generation is divided and provided in each of the winding grooves 4a to 4d.

Although this configuration is effective to some extent in preventing line-to-line discharge, it is necessary to provide a notch 5 for guiding the conductor from one winding to the adjacent winding groove, and this notch Since it becomes a discharge path for line-to-line discharge, it is difficult to sufficiently prevent line-to-line discharge.

The object of this invention is to provide a bobbin for a high-pressure generator that is improved so as to be able to effectively prevent discharge between the winding grooves.

Next, an embodiment of this invention will be described with reference to the drawings.

The bobbin indicated by the reference numeral 11 in FIGS. 2 to 7 includes a cylindrical winding core 12 and a plurality of (four in this example) shielding walls 13 a and 13 b formed on the circumferential surface of the winding core 12.
, 13C and 13d, and a winding groove 14a for accommodating each part of the coil between mutually adjacent shielding walls;
14b and 14C are formed.

Terminals 15 and 16 are attached to shield walls 13a and 13d located at both ends, respectively.

Each of the shielding walls 13a to 13d is composed of a pair of mutually parallel partition walls 17 and 18, and an introduction groove 19 located between the partition walls 17 and 18.

The introduction groove 19 formed in the first shielding wall 13a is connected to the terminal 1
The winding groove 1 extends from a position close to the winding groove 5 to a position on the opposite side thereof, and one end thereof is connected to the winding groove 1 through an opening 20 formed in the partition wall 18.
4 Connects to a.

On the other hand, the second shielding wall 13b has an introduction groove 19 that goes around the circumferential surface thereof, and this introduction groove 19 is connected to the partition wall 17.
It communicates with the winding groove 14a through a shallow notch 21 formed in the partition wall 18, and communicates with the winding groove 14b through an opening 20 formed in the partition wall 18.

This configuration also applies to the third shielding wall 13C.

The introduction groove 19 provided in the fourth shielding wall 13d is
The winding groove 14 is connected to the winding groove 14 through a shallow notch 21 formed in the partition wall 17.
C, and one end thereof reaches near the terminal 16.

What is important here is that the openings 20 formed in the partition wall 18 and the notches 21 formed in the partition wall 17 are positioned appropriately on a plane perpendicular to the axis of the bobbin 11 so that they do not face each other. It has a phase difference.

In the illustrated example, this phase difference is set to 180°;
This arrangement is advantageous when the entire pobbin 11 is integrally molded from plastic such as polyethylene.

The conductor wire used to form the coil is first connected to terminal 1 at one end.
5 and then introduced into the introduction groove 19 of the shielding wall 13H from the bottom thereof, passes through the opening 20 into the first winding groove 14a, and is wound here the required number of times.

After the required number of turns are formed within this winding groove 14a, the winding groove 14a is introduced into the introduction groove 19 of the second shielding wall 13b through the notch 21, passes through the opening 20, and enters the second winding groove 14b.
be introduced within.

Further, the conducting wire is wound the required number of times in the winding groove 14b, and then enters the introduction groove 19 of the third shielding wall 13C from the second winding groove 14b through the notch 21, passes through the opening 20, and enters the third shielding wall 13C. The wire is introduced into the winding groove 14C, where it is wound the required number of times, passes through the notch 21, enters the introduction groove 19 of the fourth shielding wall 13d, and is finally connected to the terminal 16.

This constitutes a coil divided into three parts.

For example, as shown in FIG. 8, these high voltage generating coils are two of the same type attached to a common core 31, and a high voltage generator is constructed by arranging a primary coil 32 between them. used for.

In such a high voltage generator, when a predetermined voltage is applied to the primary coil 32, a high voltage is generated in the coil wound around the bobbin 11, and a high potential difference is generated between each winding groove 142 to 14C.

However, each of the winding grooves 14a to 14C is separated by shielding walls 13b and 13C located between them, and since the shielding walls 13b and 13C do not have openings that communicate with each other in the axial direction, line-to-line discharge does not occur. effectively prevented.

In the above embodiment, the introduction grooves 19 were also formed in the shielding walls 13a and 13d located at both ends of the winding core 12.
This may be in the form of a plate similar to a normal bobbin.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional high-pressure generator bobbin, FIG. 2 is a perspective view of a high-pressure generator bobbin according to an embodiment of the invention, FIG. 3 is a partially cutaway perspective view, and FIG. 4 is a side view of the bobbin, FIG. 5 is a side view of the bobbin opposite to that shown in FIG. 4, FIG. 7 is an enlarged sectional view taken along line C--C in FIG. 4, and FIG. 8 is a perspective view of a high-pressure generator constructed using the same bobbin. 11... Bobbin, 12... Winding core, 13
a to 13d...shielding wall, 14a to 14C...
... Winding groove, 15.16 ... Terminal, 17°18
...Partition wall, 19...Introduction groove, 20...
...Opening, 21...Notch.

Claims (1)

[Scope of utility model registration request] A shielding wall perpendicular to the axis is provided on the circumferential surface of the winding core to form multiple winding grooves, and the coil that generates high voltage is divided into each winding groove to prevent line-to-line discharge. In a high-pressure bobbin made of A shallow notch is formed in the other partition wall to guide the conductive wire in the communication groove into the adjacent winding groove at a position not facing the notch. A bobbin for high pressure generators with an opening leading to the bottom.