JPH0566891U - Coil spring locking structure for high voltage terminal in engine ignition system - Google Patents

Abstract

(57) [Summary] [Object] To improve the workability of inserting and locking a coil spring in a high voltage terminal in a coil spring locking structure for a high voltage terminal in an engine ignition device. [Structure] The insertion end of the coil spring is automatically tilted by the projection provided in the insertion hole of the high voltage terminal, and the outer diameter of the insertion end is approximately equal to the inner diameter between the projection and the insertion hole of the high voltage terminal 11. The projection is smoothly passed over so as to have a diameter, and then the projection is locked.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high voltage terminal in an engine ignition device that is directly connected to a spark plug of an engine, and more particularly, to an improvement of a locking structure of a coil spring inserted and arranged inside the high voltage terminal.

[0002]

[Prior Art]

 Conventionally, as an engine ignition device, as shown in FIG. 4, a high-pressure terminal 2 is embedded in a high-voltage tower 1, and a high-voltage terminal 2 and a head terminal 4 of a spark plug 3 are inserted into an insertion hole of the high-voltage terminal 2. An electrically conductive coil spring 5 for electrically connecting and is provided. (See Japanese Patent Laid-Open No. 3-47475)

The insertion end 5 a of the coil spring 5 needs to be locked to the high voltage terminal 2 so that the coil spring 5 does not fall naturally. Therefore, as shown in detail in FIG. 5, an annular locking groove 2a is provided in a bulged manner on the peripheral wall of the insertion hole of the high-voltage terminal 2 and the outer diameter d1 of the insertion end 5a of the coil spring 5 is set to the coil. The coil spring 5 is formed in a larger diameter (d1> d2) than the outer diameter d2 of the spring, and is inserted into the insertion hole of the high voltage terminal 2 while rotating the coil spring 5 in the winding direction to reduce the insertion end 5a. Then, the insertion end portion 5a is locked in the locking concave groove 2a.

[0004]

[Problems to be solved by the device]

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

Therefore, 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 facilitates insertion and locking work of a coil spring into a high-voltage terminal and can be manufactured at low cost. To do.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides an electrically conductive coil spring for electrically connecting a spark plug or head terminal of an ignition coil to the high voltage terminal in an insertion hole of a high voltage terminal to which a high voltage is applied. In an ignition device for an engine in which is inserted and arranged, a protrusion for locking the insertion end of 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. Is formed to have a gradient narrowing 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 that the projection can be overcome and locked. It has a feature.

It is preferable that the protrusions provided on the same circumference be provided at two locations, but they may be formed by a single protrusion that protrudes within a required angle range. Further, the protrusion may be provided on the same circumference of the peripheral wall of the insertion hole at a position of an angle of 180 degrees from the insertion opening of the insertion hole to a position which is substantially the same as or smaller than the inner diameter of the insertion hole.

[0008]

[Action]

 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, the insertion end hits the protrusion when the angle is other than 180 degrees. With 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, and this inclination causes the outer diameter of the insertion end to be different from that of the projection and the insertion hole. Since the inner diameter is approximately the same as the inner diameter between them, the insertion end can be inserted over the projection. When the insertion end passes through the protrusion, it is horizontally restored by its elastic force, so that it is locked by the protrusion. In this way, coil springs of the same outer diameter can be inserted and locked with one touch, improving workability.

On the other hand, when the protrusion is provided at an angle of 180 degrees, the protrusion can be provided at a specific position so that the insertion end of the coil spring can be inserted while being inclined in advance. The outer coil spring can be inserted and locked with one touch.

[0010]

【Example】

 Hereinafter, the present invention will be described 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 shape with a predetermined pitch and a predetermined outer diameter d2. On the other hand, the high-voltage terminal 11, like the conventional high-voltage terminal 2, has a cylindrical shape having an insertion hole 11a formed with an inner diameter D1 slightly larger than the outer diameter d2 of the coil spring 10.

On the peripheral wall at a position deeper than the insertion port 11b of the high-voltage terminal 11, stoppers 11c erected inward so as to have a diameter smaller than the inner diameter D1 of the insertion hole 11a at two or more locations on the same circumference. , 11c are provided.

In addition, on the peripheral wall at a position shallower than the insertion port 11b of the high voltage terminal 11, the insertion end of the coil spring 10 is provided at two locations on the same circumference at an angle θ1 other than 180 degrees (for example, 150 degrees). Protrusions 11d, 11d for locking the portion 10a are provided. Each of the protrusions 11d, 11d is formed with a slope narrowing toward the inside of the insertion hole 11a. The positions of the protrusions 11d and 11d are deeper than the length of the inner diameter D1 from the tip of the insertion port 11b.

To insert and lock the coil spring 10 in the high-voltage terminal 11 having the above structure, the insertion end 10 a of the coil spring 10 is inserted from the insertion port 11 b of the high-voltage terminal 11 into the insertion hole 11 a. As shown by → in FIG. 2 (B), when the insertion end portion 10a hits the protrusions 11d, 11d, the protrusions 11d, 11d serve as a fulcrum, as shown by a chain double-dashed line in FIG. 2 (A). As the projections 11d and 11d have a wider angle, the protrusions 11d and 11d face downwards and the protrusions 11d and 11d have a narrower angle, and the insertion end 11a naturally tilts without changing the outer diameter d2 of the coil spring 10. Due to this inclination, the insertion end portion 10a is guided by the slope of the protrusions 11d, 11d while passing over the protrusions 11d, 11d and smoothly passing therethrough to be inserted.

When the insertion end portion 11a passes through the protrusions 11d and 11d, the insertion end portion 11a is horizontally restored by its elastic force, so that the insertion end portion 11a is larger than the inner diameter d3 of the protrusions 11d and 11d and the insertion hole 11a. It has a large outer diameter d2 and is locked by the protrusions 11d and 11d, so that the coil spring 10 does not fall naturally from the high voltage terminal 11.

In this way, the coil spring 10 can be easily inserted and locked in the high-voltage terminal 11 with one touch, so that workability is improved.

FIG. 3 shows an example in which the protrusions 11d and 11d of the high voltage terminal 11 are provided at an angle θ2 of 180 degrees. In this case, it is preferable to provide the protrusions 11d, 11d from the insertion opening 11b of the insertion hole 11a at a position having the same diameter dimension D2 or less as the inner diameter D1 of the insertion hole 11a. With this configuration, since the insertion end portion 10a of the coil spring 10 is not easily inclined by the projections 11d and 11d, the insertion end portion 10a can be inserted while being inclined in advance.

[0017]

[Effect of the device]

 As is clear from the above description, the coil spring locking structure of the high-voltage terminal of the present invention automatically tilts the insertion end of the coil spring with the protrusion provided in the insertion hole of the high-voltage terminal, and Since the outer diameter is approximately the same as the inner diameter between the protrusion and the insertion hole of the high-voltage terminal, the insertion end can smoothly pass over the protrusion and be inserted. In this way, the coil spring can be inserted and locked with one touch, and workability is improved. Further, since it is possible to process the high-voltage terminal with a conductive plate material into a cylindrical shape, there is an advantage that it can be manufactured at low cost.

[Brief description of 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 the 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]

 10 coil spring 10a insertion end 11 high voltage terminal 11a insertion hole 11b insertion port 11d protrusion θ1, θ2 angle

Claims (2)

[Scope of utility model registration request] 1. An engine in which a conductive coil spring for electrically connecting a spark plug or a head terminal of an ignition coil and the high voltage terminal is inserted and inserted into an insertion hole of a high voltage terminal to which a high voltage is applied. In the ignition device, a protrusion for locking the coil spring is provided at an angle other than 180 degrees on the same circumference of the peripheral wall of the insertion hole of the high voltage terminal,
Each of the protrusions is formed with a gradient narrowing 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 so as to pass over the protrusion and be locked. A coil spring locking structure for a high-voltage terminal in an engine ignition device, which is characterized in that 2. An ignition device for an engine, wherein a conductive coil spring for electrically connecting a head terminal of an ignition plug and the high voltage terminal is inserted and inserted into an insertion hole of a high voltage terminal to which a high voltage is applied. A protrusion 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 of 180 degrees from the insertion opening of the insertion hole to a position that is less than or equal to the inner diameter of the insertion hole. Each of the protrusions is formed with a gradient narrowing inward from the opening direction of the insertion hole, and the tip of the coil spring having substantially the same outer diameter is inclined and inserted into the insertion hole so as to pass over the protrusion. A coil spring locking structure for a high-voltage terminal in an engine ignition device, which is configured to stop.