JP2567904Y2 - Coil spring locking structure of high voltage terminal in engine ignition system - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high voltage terminal in an engine ignition device which is directly connected to a spark plug of an engine, and more particularly, to an improvement in a locking structure of a coil spring inserted and arranged inside a high voltage terminal. .

[0002]

2. Description of the Related Art Conventionally, as an ignition device for an engine, as shown in FIG. 4, a high-voltage terminal 2 is buried in a high-pressure tower 1, and a high-voltage terminal 2 and an ignition plug 3 are inserted into insertion holes of the high-voltage terminal 2. There is provided one in which a conductive coil spring 5 for electrically connecting the head terminal 4 is inserted and arranged. (See JP-A-3-47475)

It is necessary to lock the insertion end 5a of the coil spring 5 to the high voltage terminal 2 so that the coil spring 5 does not fall naturally. For this reason, as shown in detail in FIG. 5, an annular locking concave groove 2a is provided on the peripheral wall of the insertion hole of the high voltage terminal 2 by swelling, and the outer diameter d1 of the insertion end portion 5a of the coil spring 5 is adjusted by the coil spring. Larger than the outer diameter d2 (d
1> d2), insert the coil spring 5 into the insertion hole of the high voltage terminal 2 while rotating the coil spring 5 in the winding direction to reduce the diameter of the insertion end 5a, and lock the insertion end 5a. Groove 2
a.

[0004]

However, there is a problem that it is difficult to insert the large-diameter insertion end 5a of the coil spring 5 into the insertion hole of the high-voltage terminal 2, resulting in poor insertion workability. Further, when the insertion hole of the high-voltage terminal 2 is provided by cutting, there is a problem that the manufacturing cost is increased.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a coil spring locking structure for a high-voltage terminal in an engine ignition device which can be easily inserted and locked into a high-voltage terminal and can be manufactured at low cost. Is to do.

[0006]

In order to achieve the above-mentioned object, the present invention provides a method of connecting a head terminal of an ignition plug or an ignition coil and the high voltage terminal to an insertion hole of a high voltage terminal to which a high voltage is applied. In the ignition device for an engine in which a conductive coil spring to be electrically connected is inserted and arranged, a projection for locking the insertion end of the coil spring is formed on the same circumference of the peripheral wall of the insertion hole of the high-voltage terminal by 180 degrees. Provided at an angle other than the above, each of the protrusions is formed to have a gradient that narrows inward from the opening direction of the insertion hole, and a coil spring having substantially the same outer diameter is inserted into the insertion hole so as to get over the protrusion. It is characterized in that it can be locked by locking.

The protrusions provided on the same circumference are preferably provided at two places, but may be formed from a single ridge protruding within a required angle range. Further, the projection may be provided on the same circumference of the peripheral wall of the insertion hole at an angle of 180 degrees from the insertion opening of the insertion hole to a position substantially equal to or smaller than the inner diameter of the insertion hole.

[0008]

According to the coil spring locking structure of the present invention,
When the insertion end of the coil spring is inserted into the insertion hole of the high voltage terminal, when the projection is at an angle other than 180 degrees,
When the insertion end abuts on the projections, using each projection as a fulcrum,
The insertion end naturally tilts so that the wider angle of the projection is downward and the narrower angle is upward, so that the outer diameter of the insertion end is substantially the same as the inner diameter between the projection and the insertion hole. Thus, the insertion end can be inserted over the projection. When the insertion end portion passes through the protrusion, the insertion end portion is restored to a horizontal state by its elastic force, so that the insertion end portion is locked by the protrusion. As described above, the coil springs having the same outer diameter can be inserted and locked with one touch, and workability is improved.

On the other hand, when the projection is provided at an angle of 180 degrees, by providing the projection at a specific position,
Since the insertion end of the coil spring can be inserted while being tilted in advance, the coil spring having the same outer diameter can be similarly inserted and locked with one touch.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. As shown in FIGS. 1 and 2, the coil spring 10 is wound in a perfect circular spiral at a predetermined pitch and a predetermined outer diameter d2. On the other hand, the high-voltage terminal 11 has a cylindrical shape having an insertion hole 11a formed in the inner diameter D1 slightly larger than the outer diameter d2 of the coil spring 10, similarly to the conventional high-voltage terminal 2.

The peripheral wall at a position deeper than the insertion port 11b of the high-voltage terminal 11 has two or more insertion holes 11 on the same circumference.
Stoppers 11c, 11c raised inward so as to have a smaller diameter than the inner diameter D1 of a are provided.

The peripheral wall at a position shallower than the insertion opening 11b of the high-voltage terminal 11 has 180 points on the same circumference.
At an angle θ1 other than degrees (for example, 150 degrees), the projections 11d for locking the insertion end 10a of the coil spring 10 are provided.
11d is provided. Each of the projections 11d, 11d
The insertion hole 11a is formed with a gradient that narrows inward. The positions of the projections 11d, 11d are
It is provided at a position deeper than the length of the inner diameter D1 from the tip of b.

In order to insert and lock the coil spring 10 into the high-voltage terminal 11 having the above configuration, the insertion end 10a of the coil spring 10 is inserted into the insertion port 11b of the high-voltage terminal 11.
From the insertion hole 11a. As shown by → in FIG. 2 (B), when the insertion end 10a abuts against the protrusions 11d, 11d, the protrusions 11d, 11d are used as fulcrums, as shown by a two-dot chain line in FIG. 2 (A). The larger the angle of the protrusions 11d, 11d is, the lower the direction is, and the smaller the angle, the upper end is. Due to this inclination, the insertion end 10a
Is guided by the gradient of the projections 11d, 11d.
It passes over 1d and 11d and passes smoothly and is inserted.

When the insertion end 11a passes through the projections 11d, 11d, the insertion end 11a is restored horizontally by its elastic force, so that the diameter is larger than the inner diameter d3 of the projections 11d, 11d and the insertion hole 11a. Outer diameter d2 of the projection 11d,
Locked at 11d, the coil spring 10 does not drop naturally from the high voltage terminal 11.

As described above, since the coil spring 10 can be easily inserted and locked into the high-voltage terminal 11 with one touch, workability is improved.

FIG. 3 shows the protrusions 11d, 1 of the high voltage terminal 11.
This is an example in which 1d is provided at an angle θ2 of 180 degrees. In this case, the protrusions 11d are connected to the insertion opening 1 of the insertion hole 11a.
From 1b, it is preferable to provide it at a position not more than the same diameter D2 as the inner diameter D1 of the insertion hole 11a. With this configuration, the insertion ends 10 of the coil spring 10 are
Since a is not easily inclined, the insertion end 10a can be inserted while being inclined in advance.

[0017]

As is clear from the above description, the coil spring locking structure of the high voltage terminal according to the present invention automatically tilts the insertion end of the coil spring with the projection provided in the insertion hole of the high voltage terminal. Since the outer diameter of the insertion end is substantially equal to the inner diameter between the projection and the insertion hole of the high-voltage terminal, the insertion end can smoothly go over the projection and insert. As described above, the coil spring can be inserted and locked with one touch, and workability is improved. In addition, since the high-voltage terminal can be processed into a cylindrical shape by using a conductive plate, it has an advantage that it can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a coil spring locking structure of the present invention.

FIG. 2A is a sectional view taken along line AA of FIG. 1 of the first embodiment,
(B) is an operation explanatory view.

FIG. 3 is a sectional view similar to FIG. 2 of a second embodiment of the present invention;

FIG. 4 is a side sectional view of a conventional engine ignition device.

FIG. 5 is a side sectional view of a conventional coil spring locking structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Coil spring 10a Insertion end part 11 High-voltage terminal 11a Insertion hole 11b Insertion port 11d Projection θ1, θ2 Angle

Claims (2)

(57) [Scope of request for utility model registration] 1. An engine in which a conductive coil spring for electrically connecting a head terminal of an ignition plug or an ignition coil to the high-voltage terminal is inserted into an insertion hole of a high-voltage terminal to which a high voltage is applied. In the ignition device, a projection for locking the coil spring is provided on the same circumference of the peripheral wall of the insertion hole of the high-voltage terminal at an angle other than 180 degrees,
Each of the projections is formed to have a gradient that narrows inward from the opening direction of the insertion hole, and the coil spring having substantially the same outer diameter is inserted into the insertion hole to move over the projection and lock. A coil spring locking structure for a high voltage terminal in an engine ignition device having a configuration. 2. An ignition device for an engine in which a conductive coil spring for electrically connecting a head terminal of an ignition plug and the high voltage terminal is inserted into an insertion hole of a high voltage terminal to which a high voltage is applied. A projection that locks the coil spring on the same circumference of the peripheral wall of the insertion hole of the high-voltage terminal is provided at an angle of 180 degrees from the insertion opening of the insertion hole to a position substantially equal to or less than the inner diameter of the insertion hole; Each of the protrusions is formed to have a gradient that narrows inward from the opening direction of the insertion hole, and the tip of the coil spring having substantially the same outer diameter is inserted into the insertion hole by inclining the protrusion so as to get over the protrusion. A coil spring locking structure for a high voltage terminal in an engine ignition device, wherein the coil spring is locked.