JP2594380Y2 - 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 coil spring locking structure for a high voltage terminal in an engine ignition device. More specifically, in an ignition device connecting one ignition plug and one ignition coil, a high voltage is applied to the ignition coil side. A tubular conductor forming a voltage terminal is fixed, a coil spring is inserted into the tubular conductor, the conductor is electrically connected to the coil spring, and the other end of the coil spring is ignited. In the electrical connection with the plug, the coil spring can be easily inserted into the conductor and can be securely locked inside the conductor.

[0002]

2. Description of the Related Art Conventionally, as an ignition device for the above engine,
As shown in FIG. 3, a high-voltage terminal 2 is buried in a high-voltage tower 1 on the ignition coil side, and an insertion hole 2a of the high-voltage terminal 2 is provided.
Further, there is provided a device in which a conductive coil spring 5 for electrically connecting the high voltage terminal 2 and the head terminal 4 of the ignition plug 3 is inserted. (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 to such an extent that the coil spring 5 does not fall naturally. Therefore, a locking structure of the coil spring and the high voltage terminal as shown in detail in FIG. 4 or 5 is provided. In the locking structure shown in FIG. 4, an annular locking concave groove 2b is provided on the peripheral wall of the insertion hole 2a of the high voltage terminal 2 by swelling, and the outer diameter d1 of the insertion end 5a of the coil spring 5 is increased.
Is larger than the outer diameter d2 of the coil spring 5 (d1> d2)
The insertion end 5a is engaged with the locking groove 2b with respect to the insertion hole 2a 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. I try to stop it.

In the locking structure shown in FIG. 5, the outer diameter of the insertion end 5a of the coil spring 5 is
The diameter d3 of the insertion hole 2a 'of the high voltage terminal 2 is set to be smaller than the outer diameter d2 of the coil spring 5 (d2> d3) without making the diameter larger than the outer diameter d2 of the high voltage terminal 2, and the insertion hole 2a' On the other hand, the coil spring 5 is attached by press-fitting while applying relative rotation.

[0005]

However, it is very difficult to insert the coil spring 5 having a large outer diameter into the insertion hole 2a of the high-voltage terminal 2 as described above. In addition, the insertion work of press-fitting the coil spring 5 into the high-voltage terminal 2 while applying relative rotation to the high-voltage terminal 2 is performed manually because it is difficult to perform automation by a machine. Problems such as painful fingertips occur during work.

Further, when the insertion hole 2a of the high voltage terminal 2 is provided by cutting, there is a problem that the cost is increased on the processing surface of the insertion hole. Further, when the coil spring 5 is attached to the locking recess 2b of the insertion hole 2a of the high voltage terminal 2 or the insertion hole 2a 'having a small inner diameter, the locking force (holding force) of the coil spring 5 is reduced. There is a limit, and when the coil spring is pulled in the direction opposite to the insertion direction, there is a problem that the coil spring easily comes off.

The present invention has been made in view of the above problems, and it is possible to easily insert a coil spring into a high-voltage terminal and to securely hold the coil spring in a mounted state so as not to fall off. It is an object of the present invention to provide a coil spring locking structure for a high voltage terminal in an engine ignition device that can be provided.

[0008]

In order to achieve the above-mentioned object, according to the present invention, there is provided a conductive member electrically connected to a spark plug inside a high voltage terminal formed of a tubular conductor fixed to an ignition coil side. The above-mentioned coil spring is inserted and latched from below while being aligned with the center axis of the tubular conductor. Characterized in that a hook-shaped hook portion is provided on the insertion end side of the coil, and the hook portion is hooked on a locking piece of the conductor to lock the coil spring to the tubular conductor. An object of the present invention is to provide a coil spring locking structure for a voltage terminal.

The hook-shaped hook portion provided on the coil spring has a shape which is projected in a direction perpendicular to the coil winding direction and is bent in a round shape. The diameter of the coil winding is set to be equal to or smaller than the inner diameter of the conductor. The coil spring can be inserted into the conductor without rotating.

On the other hand, the locking piece provided on the conductor constituting the high-voltage terminal is formed by cutting and raising the peripheral wall of the conductor and inclining upwardly inward from the peripheral wall. The amount of protrusion in the direction exceeds the center line of the conductor. Further, the conductor is cut and raised on a peripheral wall facing the locking piece, and provided with a stopper piece protruding inward. With the hook portion of the coil spring locked on the locking piece, the coil spring The tip of the coil is brought into contact with the stopper piece to stop the positioning. When the other end of the coil spring is connected to the ignition plug, the coil spring is normally compressed.

[0011]

In the above device, the coil spring is inserted into the cylindrical conductor of the high voltage terminal from the opening at the end without rotating. When the hook-shaped hook at the tip of the coil spring comes into contact with the locking piece, the hook is pushed along the lower surface of the inclined locking piece, and when it gets over the upper end of the locking piece, it returns elastically, and the hook returns. The part is locked to the locking piece. As described above, it is possible to easily lock the locking piece only by pushing the coil spring, and it is not detached after locking the locking piece.

In this locked state, the distal end of the coil winding of the coil spring is pressed against the stopper piece and compressed at a predetermined compression ratio with the other end of the coil spring attached to the ignition plug side.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the drawings. In the present invention, as shown in FIGS. 1A and 1B, a high-voltage terminal made of a tubular conductor 10 is inserted and fixed to a high-voltage tower (shown in FIG. 3) on the ignition coil side. A coil spring 11 is inserted into the tubular conductor 10 and electrically connected thereto, and the other end of the coil spring 11 is connected to a head terminal of an ignition plug (shown in FIG. 3) so as to be electrically connected. ing.

The conductor 10 includes a coil spring 11
And a locking piece 10c protruding inward is provided at a required position on the peripheral wall 10b of the conductor 10. The locking piece 10c is a peripheral wall 10b.
Is cut and raised in the axial direction to be bent inward, and is inclined upward at a required angle with respect to the peripheral wall 10b. The amount of protrusion of the locking piece 10c inward is set so as to exceed the center line l of the insertion hole 10a.

Further, the conductor 10 is provided with
A stopper piece 10d projecting inward is formed on the peripheral wall 10b facing the base of c. The stopper piece 10d is
Similarly to the locking piece 10c, it is cut and raised in the axial direction from the peripheral wall 10b, bent inward, and inclined downward from the peripheral wall 10b.

The coil spring 11 is formed of a conductive spring member, and has a diameter slightly smaller than the inner diameter of the insertion hole 10a of the conductor 10 and is wound in a perfect circular spiral at a required pitch as described above. It was what was.

At the tip of the coil spring 11, a hook-shaped hook portion 11a projecting in the direction perpendicular to the coil winding direction and curved in a circular shape is projected. The hook 1
Since 1a is located on the center line of the coil spring 11 and is curved in a circular shape, it has a circular engaging hole 11b. The hook portion 11a has a distance L from the base end portion 11c to the tip end thereof set substantially equal to the height H from the lower edge of the stopper piece 10d of the conductor 10 to the upper edge of the locking piece 10c. .

Next, the conductor 10 of the high voltage terminal having the above-described structure is used.
An assembly process for mounting the coil spring 11 will be described. First, the coil spring 11 is inserted from below into the insertion hole 10a of the conductor 10 from the hook portion 11a side. In this insertion operation, the outer diameter of the coil spring 11 is set smaller than the inner diameter of the insertion hole 10a of the conductor 10, so that the coil spring 11 can be easily inserted in a straight state without rotating.

By inserting the coil spring 11, FIG.
As shown in (A), first, the leading end of the hook portion 11a of the coil spring 11 abuts on the lower surface of the locking piece 10c in a substantially orthogonal state. When the coil spring 11 is further pushed in from this state, as shown in FIG.
It rises along the inclination of 0c while being elastically inclined with the base end portion 11c as a fulcrum.

As described above, after the hook 11a rises while being inclined along the locking piece 10c and rises to the upper end portion of the locking piece 10c, the base end 11c is moved to the stopper piece 1c.
At the same time that the hooking portion 11a comes into contact with the engaging piece 10c, the hook portion 11a gets over the engaging piece 10c. As a result, the hook portion 11a is elastically returned on the center line of the coil spring 11, that is, on the center line l of the insertion hole 10a, so that the locking piece 10c is brought into the hook portion 11a.
1A and 1B, and is in the mounting state shown in FIGS.

As described above, the hook-shaped hook portion 11a of the coil spring 11 can be formed by simply inserting the coil spring 11 into the conductor 10 of the high-voltage terminal without any relative rotation. It is attached by engaging with a locking piece 10c in the conductor 10.

In this mounted state, the locking piece 10c of the conductor 10 inclined upward is securely inserted into the engagement hole 11b of the coil spring 11 so as to be engaged with the coil spring 11. Even if tension is applied in the anti-insertion direction, the coil spring 11 does not separate from the conductor 10.

Further, the locking piece 10c of the conductor 10 is provided by cutting and raising the peripheral wall 10b.
Is formed with a cut and raised hole 10c-1.
By means of 1, it is possible to visually check whether or not the locking piece 10c and the hook portion 11a of the coil spring 11 are securely engaged.

On the other hand, when the coil spring 11 attached to the ignition coil side is joined to the head terminal of the ignition plug as described above, the coil spring 11 is positioned and held by the stopper piece 10d, so that the required compression ratio Can be compressed.

[0025]

As is apparent from the above description, in the present invention, in the locking structure of the cylindrical conductor which becomes the high voltage terminal and the coil spring, the diameter of the coil spring is made larger than the inner diameter of the insertion hole of the conductor. In addition, a hook-shaped hooking portion is provided at the insertion end of the coil spring, and a locking piece is provided in the conductor so as to protrude in an inclined manner in the insertion hole, so that the coil spring is pushed into the insertion hole of the conductor. It is possible to lock and attach the hook portion of the coil spring to the locking piece of the electric conductor only by inserting the coil.

Therefore, the coil spring can be easily attached to the conductor of the high-voltage terminal by simply pushing it straight in without adding a relative rotation to the conductor, thereby improving workability. Further, when the locking piece of the conductor and the hooking portion of the coil spring are locked, the locking piece is securely locked in the engaging hole of the hooking portion. Is attached, the attached state can be reliably maintained without the coil spring coming off the conductor.

[Brief description of the drawings]

FIG. 1 shows a structure for locking a conductor and a coil spring constituting a high-voltage terminal of the present invention, and FIG.
(B) is a side sectional view.

FIGS. 2A and 2B are cross-sectional views showing an operation process of inserting a coil spring into a conductor.

FIG. 3 is a side sectional view of the engine ignition device.

FIG. 4 is a cross-sectional view showing a conventional coil spring locking structure.

FIG. 5 is a cross-sectional view showing another conventional coil spring locking structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Conductor used as a high voltage terminal 10a Insertion hole 10c Locking piece 10d Stopper piece 11 Coil spring 11a Hook

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01T 13/04 F16F 1/12 H01R 4/48

Claims (3)

(57) [Scope of request for utility model registration] 1. A high-voltage terminal made of a tubular conductor fixed to an ignition coil side, a conductive coil spring electrically connected to an ignition plug is aligned with the center axis of the tubular conductor. In the one to be inserted and locked from below, a locking piece projecting upward and inclined is provided inside the tubular conductor, and a hook-shaped hook is provided on the insertion end side of the coil spring, and the hook is provided. A coil spring locking structure for a high voltage terminal in an engine ignition device, wherein a portion is hooked on a locking piece of the conductor to lock the coil spring to the tubular conductor. 2. The hook-shaped hooking portion provided on the coil spring has a shape that is protruded in a direction perpendicular to the coil winding direction and is bent in a round shape, and the diameter of the coil winding is smaller than the inner diameter of the conductor. The coil spring locking structure according to claim 1, wherein the coil spring is set and inserted into the conductor without rotating the coil spring. 3. The coil spring locking structure according to claim 1, wherein the conductor has a stopper piece protruding inward at a position facing the base side of the locking portion.