JP2882502B2 - 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 directly connected to a spark plug of an engine, and more particularly to an improved locking structure of a coil spring inserted and arranged inside a high-voltage terminal. Things.

[0002]

2. Description of the Related Art Conventionally, as an engine ignition device, as shown in FIG. 14, a high-voltage terminal 2 is buried in a high-pressure tower 1 and a high-voltage terminal 2 and a head of an ignition plug 3 are provided inside the high-voltage terminal 2. There is provided one in which a conductive coil spring 5 for electrically connecting the 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. 15 (A), an annular locking concave groove 2a is provided by swelling on the peripheral surface of the cylindrical portion of the high voltage terminal 2, and the outer diameter of the insertion end 5a of the coil spring 5 is increased. d1 is formed to have a larger diameter (d1> d2) than the outer diameter d2 of the coil spring 5, and the coil spring 5
Is inserted in the high-voltage terminal 2 while rotating in the opposite direction to the winding direction to reduce the diameter of the insertion end 5a.
Is locked in the locking groove 2a.

[0004]

However, the large-diameter insertion end 5 of the coil spring 5 is provided inside the high-voltage terminal 2.
There has been a problem that the work of inserting a is difficult, and the insertion workability is poor. Further, there is a problem that the insertion end 5a of the coil spring 5 is not visually confirmed that the insertion end 5a of the coil spring 5 is locked in the locking groove 2a of the high voltage terminal 2.

For this reason, as shown in FIG. 15B, the insertion end 5a of the coil spring 5 has the same diameter as the outer diameter d2 of the coil spring 5, and the coil spring 5 is inserted into the high voltage terminal 2. After that, there is a method in which a part of the outer peripheral wall of the high voltage terminal 2 is pulled out and raised inward, and the insertion end 5a is locked by the pulled out and raised pieces 2b and 2b.

[0006] In the case of locking with the pull-out pieces 2b, it is necessary to perform pull-up processing in a separate step after inserting the coil spring 5, and when the bending of the pull-up piece to the inside is small. In many cases, the spring cannot be seen from the gap between the pull-out pieces due to the play of the spring in the vertical direction, and it is also difficult to visually confirm the engagement of the spring from the outside.

SUMMARY OF THE INVENTION It is an object of the present invention to easily insert and lock a coil spring into a high voltage terminal, and to provide a high voltage terminal in an engine ignition device in which the locked state can be visually observed from the outside. An object of the present invention is to provide a coil spring locking structure.

[0008]

In order to achieve the above object,
The present invention, in the cylindrical portion of the high voltage terminal to which a high voltage is applied,
In an engine ignition device in which a conductive coil spring for electrically connecting a head terminal of an ignition plug and the high-voltage terminal is inserted and disposed, the coil spring is disposed at a position opposed to a peripheral wall of a cylindrical portion of the high-voltage terminal in a direction perpendicular to the axis. While providing a pair of locking portions consisting of holes and / or concave grooves for locking the insertion-side end, the coil spring separates adjacent winding elements and has an outer diameter smaller than the inner diameter of the cylindrical portion. Wound so as to form a perfect circular spiral, terminate the winding element at one end on the insertion side in a horizontal state, and at a position facing the spring axis of the winding element at one end on the insertion side in a direction orthogonal to the inner diameter of the cylindrical portion. A configuration in which a pair of projecting portions whose outer diameters are large is provided, and the coil spring is disposed between the winding elements adjacent to the winding element for several turns from the winding element at one end on the insertion side. Reduce on one forming position side Then, the winding element at the other forming position is inserted into the cylindrical portion of the high-voltage terminal in a state where the winding element at one end on the insertion side is inclined, and after the insertion, the winding element at one end on the insertion side is subjected to elastic force. A coil spring locking structure for the high-voltage terminal in the engine ignition device, wherein the pair of protrusions is locked to a pair of locking portions provided on the cylindrical peripheral wall of the high-voltage terminal. doing.

[0009]

Specifically, for example, the cross-section of the insertion end of the coil spring is made elliptical, the elliptical portion is inserted obliquely when the terminal is inserted, and both sides are projected horizontally at the locking portion. It is a projection. Furthermore, the present invention relates to an engine ignition device in which a conductive coil spring for electrically connecting a head terminal of an ignition plug and the high-voltage terminal is inserted and disposed in a cylindrical portion of a high-voltage terminal to which a high voltage is applied. The coil spring was wound so as to form a perfect circular spiral having an outer diameter smaller than the inner diameter of the cylindrical portion, and the winding element at one end on the insertion side was terminated in an inclined state, and terminated in the inclined state. A configuration in which a pair of projecting portions having a horizontal separation distance between the outer ends of the winding elements larger than the inner diameter of the cylindrical portion is provided at a position facing the inclined direction of the winding element,
On a pair of straight lines parallel to the axis of the cylindrical portion at positions opposing each other in the direction orthogonal to the axis of the peripheral wall of the cylindrical portion of the high-voltage terminal, a pair of locking portions formed of holes and / or concave grooves for locking the pair of protrusions is formed. It is formed so as to be vertically displaced corresponding to the inclination angle of the winding element at one end on the insertion side, and the coil spring is inserted into the cylindrical portion of the high voltage terminal from the winding element at one end on the insertion side,
A coil spring locking structure for a high-voltage terminal in an engine ignition device, wherein the pair of protrusions is locked to a pair of vertically-shifted locking portions provided on a peripheral wall of a cylindrical portion of a soil high-voltage terminal. doing.

Also, of the pair of locking portions provided on the terminal side for locking the projecting portions on both sides of the coil spring,
At least one of the holes is formed with a hole, and the hole is shaped so that the locked coil spring can be viewed from the outside.

[0012]

According to the coil spring locking structure of the present invention,
If the insertion end of the coil spring is tilted so that the protrusion is in the vertical position, the outside diameter of the protrusion will be approximately the same as the outside diameter of the coil spring, so insert the insertion end inside the high voltage terminal Work can be performed easily. The inclined insertion end is locked at a different angle by the locking portion of the high-voltage terminal, or is locked after being restored to a horizontal position. As described above, the coil spring can be inserted and locked with one touch, and workability is improved.

When the locking portion of the high-voltage terminal is formed by a hole, it can be visually confirmed from the outside that the insertion end of the coil spring is locked in the locking portion. Further, if the insertion end of the coil spring is inclined in advance, the trouble of inclining before insertion is not required.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. 1 to 7 show a first embodiment of the present invention. FIGS. 1 and 2 show a state where a coil spring 10 is locked to a terminal 11, FIG. 3 shows a terminal 11, and FIGS. 10 and 7 show a state before the coil spring 10 is inserted into the terminal.

The coil spring 10 is, like the conventional coil spring 5, wound in a perfect spiral with a predetermined pitch and a predetermined outer diameter d2. At the insertion end 10a of the coil spring 10, as viewed from the plane of FIG.
On both sides of the insertion end 10a in the direction perpendicular to the axis, there are provided protrusions 10b, 10b projecting outward with a diameter d1 larger than the outer diameter d2 of the coil spring 10. Therefore, the insertion end 10a has an elliptical shape as shown in FIG. 4 due to the protruding portions 10b, 10b. In addition to the above elliptical shape,
The shape may be a rhombus as shown in FIG. 8 (A) or a projection as shown in FIG. 8 (B), and is not limited as long as the shape has projections on both sides.

On the other hand, as shown in FIG.
Is a coil spring 10 similar to the conventional high voltage terminal 2.
Is formed in a cylindrical shape having an insertion hole 11a having a diameter slightly larger than the outer diameter d2 of the coil spring 10 at a predetermined position on the outer peripheral wall of the high-voltage terminal 11.
Lock holes 11b, 11b for locking b, 10b are opened. The locking holes 11b, 11b may have a perfect circular shape as shown in FIG. 9A, an elliptical shape as shown in FIG. 9B, or a slit shape as shown in FIG. 9C.

When inserting and locking the coil spring 11 into the terminal 10 having the above-described configuration, first, before inserting the coil spring 10, the insertion end 10a of the coil spring 10 is moved up and down by the protrusions 10b and 10b. Incline to the position. As a result, the outer diameter d1 of the insertion end portion 10a with respect to the outer diameter d2 of the coil spring 10 becomes smaller by the amount of inclination as shown in FIG. d3
The high voltage terminal 11 can be easily inserted into the insertion hole 11a.

The insertion end 10a of the coil spring 10 inserted into the insertion hole 11a of the high-voltage terminal 11 while being inclined.
When the projections 10b, 10b coincide with the locking holes 11b, as shown in FIG. 1 and FIG. 2, the inclined state is restored to the horizontal state by the elastic force, and the projections 10b, 10b are The coil spring 10 is prevented from dropping naturally from the high-voltage terminal 11 by being fitted into and locked by 11b.

As described above, since the coil spring 10 can be inserted and locked into the high-voltage terminal 11 with one touch, workability is improved. When the locking holes 11b, 11b of the high-voltage terminal 11 are viewed from the outside, the protrusions 10b, 10b of the insertion end 10a of the coil spring 10 are fixed to the locking holes 11b, 11b.
Can be visually confirmed.

The high-voltage terminal 11 of the first embodiment has the locking holes 11b, 11b that can be viewed from the outside. However, if it is not necessary to visually check the high-voltage terminal 11, as shown in FIG. The locking groove 11c may be a vertically long locking groove 11c or a semicircular locking groove 11d as shown in FIG. Particularly, in the case of the long locking concave groove 11c shown in FIG. 10A, the insertion end 10a of the coil spring 10 inserted while being inclined.
Can be restored to the horizontal state. In addition, as shown in FIG.
b, if the locking groove 11d is provided on the other side, visual observation becomes possible.

The locking grooves 11c and 11d of the high-voltage terminal 11 shown in FIGS. 10A and 10B and FIG. 11 are formed by projecting the inner surface of the peripheral wall outward. As shown in FIGS. 12 (A) and 12 (B), the outer surfaces of the peripheral wall may be stamped inward to form the locking grooves 11c and 11d. In this case, in order to prevent the protrusions 10b, 10b of the insertion end 10a from being caught by the projections 11e, 11e when the coil spring 10 is inserted,
It is preferable that the coil spring 10 be housed in the sleeve-like jig 15 having a diameter smaller than the inner diameter of the embossing projections 11e, 11e to perform the insertion operation.

As shown in FIG. 7, if the insertion end 10a of the coil spring 10 is tilted in advance so that the protruding portions 10b, 10b are in the vertical position, the insertion end 10a is tilted before insertion. No labor is required, and the insertion operation can be performed more quickly. In this case, as shown in FIG. 13, the locking holes 11b, 11b of the high-voltage terminal 11 may be formed so that the vertical positions thereof are shifted in accordance with the inclination angles of the protruding portions 10b, 10b which change under no load. .

That is, the coil spring protrusions 10b,
10b may be made to protrude from the outer diameter in a horizontal direction or an inclined state when no load is applied, and
The locking portion formed on the terminal locked by these protrusions may be formed at a position for locking the protrusion protruding under no load.

It is sufficient that the locking portion formed on the terminal is locked to such an extent that the projecting portion of the coil spring is hooked to the inner edge of the hole in the falling direction. However, when the number of locking portions is small, it is preferable to provide a projection serving as a stopper on the inner surface of the terminal on the side where the coil spring is compressed in the opposite direction.

[0025]

As is apparent from the above description, in the coil spring locking structure of the high voltage terminal according to the present invention, the insertion end of the coil spring is inclined such that the protruding portion is in the vertical position, and the terminal is inserted. Sometimes it is smaller than the inner diameter of the cylindrical terminal, so the insertion work can be done smoothly, and the outer diameter of the projecting part of the coil spring projects at the locking part provided on the terminal, so the one-touch coil spring on the high voltage terminal , And the workability is improved.

When the locking portion of the high-voltage terminal is formed by a hole, it can be visually confirmed that the insertion end of the coil spring has been locked to the locking portion.

[Brief description of the drawings]

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

FIG. 2 is a plan sectional view of FIG.

FIG. 3 is a side sectional view of a high voltage terminal.

FIG. 4 is a plan view of the coil spring of FIG. 1;

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a sectional view taken along line BB of FIG. 4;

FIG. 7 is a side sectional view showing a state where the coil spring is inserted into a terminal.

FIGS. 8A and 8B are plan views showing modified examples of the insertion end of the coil spring.

FIGS. 9A, 9B, and 9C are side views showing modified examples of locking portions provided on terminals.

FIGS. 10A and 10B are side cross-sectional views showing modified examples of a locking portion provided on each terminal.

FIG. 11 is a side sectional view showing a modification of the locking portion of the terminal.

FIGS. 12A and 12B are side cross-sectional views showing a modification of the locking portion of the terminal.

FIG. 13 is a side sectional view showing a modification of the locking structure of the coil spring.

FIG. 14 is a side sectional view of a conventional engine ignition device.

15A and 15B are side sectional views showing a conventional coil spring locking structure, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Coil spring 10a Insertion end 10b Projection 11 High voltage terminal 11b Locking hole 11c, 11d Locking groove

Claims (3)

(57) [Claims] 1. An engine ignition device in which a conductive coil spring for electrically connecting a head terminal of an ignition plug and said high-voltage terminal is inserted into a cylindrical portion of a high-voltage terminal to which a high voltage is applied, A pair of locking portions including a hole and / or a concave groove for locking the insertion side end of the coil spring is provided at a position opposed to the peripheral wall of the cylindrical portion of the high-voltage terminal in a direction perpendicular to the axis, while the coil spring is adjacent. The winding element is separated and wound so as to form a perfect circular spiral whose outer diameter is smaller than the inner diameter of the cylindrical portion, and the winding element at one end on the insertion side is terminated in a horizontal state, and one end on the insertion side. And a pair of projecting portions whose outer diameter is larger than the inner diameter of the cylindrical portion is provided at a position opposed to the spring axis of the winding element in a direction orthogonal to the spring axis. Adjacent winding elements In the cylindrical portion of the high-voltage terminal in a state where the winding element to be reduced at one forming position side of the pair of protrusions and enlarged at the other forming position side and the winding element at one end on the insertion side is inclined. And after the insertion, the winding element at one end on the insertion side is returned to a horizontal state by its elastic force,
A coil spring locking structure for a high voltage terminal in an engine ignition device, wherein a pair of protrusions are locked to a pair of locking portions provided on a peripheral wall of a cylindrical portion of the high voltage terminal. 2. An engine ignition device in which a conductive coil spring for electrically connecting a head terminal of an ignition plug and the high-voltage terminal is inserted into a cylindrical portion of a high-voltage terminal to which a high voltage is applied, The coil spring is wound so as to form a perfect spiral having an outer diameter smaller than the inner diameter of the cylindrical portion, and the winding element at one end on the insertion side is terminated in an inclined state, and the coil element is terminated in the inclined state. A configuration is provided in which a pair of protrusions is provided at a position opposed to each other in the direction of inclination of the element in which the horizontal separation distance between the outer ends of the elements is larger than the inner diameter of the cylindrical portion. A pair of locking portions formed of holes and / or concave grooves for locking the pair of protrusions on a pair of straight lines parallel to the axis of the cylindrical portion at the opposing positions, and the inclination angle of the winding element at one end on the insertion side. Formed by shifting the position up and down corresponding to The coil spring is inserted into the cylindrical portion of the high-voltage terminal from the winding element at one end on the insertion side, and the pair of projecting portions are engaged with a pair of locking portions provided on the peripheral wall of the cylindrical portion of the high-voltage terminal and displaced vertically. A coil spring locking structure for a high-voltage terminal in an engine ignition device, which is locked. 3. A pair of locking portions provided on the terminal side for locking the pair of projecting portions of the coil spring, at least one of the pair of locking portions is formed of a hole, and the hole is used to connect the locked coil spring to the outside. 2. A shape that is more visible.
A coil spring locking structure for a high voltage terminal in the engine ignition device according to claim 2.