JPH0334871Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a holder for strengthening the connection of a cap fitted to the tip of an engine spark plug.
In particular, the present invention relates to a holder for a spark plug cap that is useful for engines that are used under conditions of large vibrations, such as engines installed in vehicles for road racing and motocross.

[Prior Art] A socket-type cap is fitted onto the tip of an engine's spark plug to allow ignition current to flow therethrough. This cap is made of rubber on the outside and has a metal socket part on the inside.

Conventionally, this cap is connected by fitting a connector plug provided inside the cap to a terminal portion of a spark plug so that the connector plug does not become unfitted due to the force of a spring. Additionally, the outer rubber lip of the cap wraps around the spark plug to assist in connection.

[Problems to be solved by the invention] However, in engines that are used under conditions with large vibrations, it is necessary to strengthen the coupling force between the spark plug and the cap due to the above structure, and in this case, there is a problem that maintenance becomes difficult. It was hot.

SUMMARY OF THE INVENTION An object of the present invention is to provide a new holder that allows a spark plug cap to be easily installed and removed, and that can reliably connect the cap to a spark plug even in the face of strong vibrations.

[Means for Solving the Problems] The spark plug cap retaining holder of the present invention includes a locking portion that locks on a locked portion of the cap;
It has an engaging part that engages with the stepped part of the plug that is exposed between the engine body and the hem of the cap when the cap is placed over the plug, and the engaging part and the engaging part are integrated by a connecting part. The length of the connecting portion is set in accordance with the distance between the locked portion of the cap and the stepped portion of the plug.

[Function] After the cap is fitted into the plug, the holder with the above structure locks the locking part of the holder to the locked part of the cap, and at the same time, separates the engaging part of the holder from the engine body and the hem of the cap. Set by engaging the exposed stepped part. In this case, since the distance between the locking part and the engaging part is regulated by the connecting part, the cap does not move in the direction of coming out from the state in which it is fitted to the plug.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

1 and 2 show an embodiment of the present invention. The holder 1 of this embodiment is for an L-shaped cap 3 fitted into a spark plug 2 of an engine.

The holder 1 is integrally molded from a relatively hard and somewhat flexible material such as plastic, and has a semicircular top plate portion (locking portion) that covers the head surface 3a of the cap 3. 1a, and a cylindrical side plate portion (connecting portion) 1b that covers the peripheral surface 3b of the cap 3.
and a bottom plate portion 1d having a notch 1c that engages with the stepped portion 5 of the plug 2 exposed between the hem portion (rip portion) 3c of the cap 3 and the engine body 4 in which the plug 2 is set. ing.

Further, an opening 1e is formed in the side plate portion 1b so as to be continuous with the notch 1c, so that the holder 1 can be fitted into the cap 3 fitted into the plug 2 from the side. The height from the bottom plate part 1d to the top plate part 1a is approximately equal to or slightly smaller than the height from the stepped part 5 of the plug 2 to the cap head surface 3a when it is fitted into the plug 2. It is set.

Note that the notch 1c is located at the stepped portion 5 of the plug 2.
A hole with a diameter approximately equal to the diameter of the groove 6 formed by
It has a shape with a notch that is narrower than its diameter, and has a narrow entrance.

To set up holder 1 with such a configuration,
Position the opening 1e of the holder 1 on the side of the cap 3 fitted into the plug 2, and then open the stepped portion 5 of the plug 2.
The entrance of the notch 1e of the bottom plate portion 1d of the holder 1 is made to face the groove 6 below. In this state, push the holder 1 into the cap 3. By doing this, the holder can be set with one touch, whereby the notch 1e of the bottom plate part 1d fits into the groove 6 of the plug 2, and the top plate part 1a hits and presses the head surface 3a of the cap 3.

Therefore, with this holder 1, the cap 3
is held down so that it does not move in the direction of exit.
In this case, since the entrance of the notch 1e of the holder 1 is narrowed, the groove 6 of the plug 2 has a bottom plate portion 1.
d cannot be removed. Moreover, from the bottom plate part 1e to the top plate part 1a
If the height of the cap is smaller than the distance from the stepped part 5 of the plug 2 to the head surface of the cap fitted in the plug 2, the height of the holder 1 can be set by slightly deforming the holder 1. The elastic force of the cap 3 presses the cap 3, thereby further strengthening the bonding force of the cap 3.

Incidentally, by aligning the direction indicated by arrow A in FIGS. 1 and 2 with the forward direction of the vehicle, it is possible to prevent dust from entering the fitting portion between the cap 3 and the plug 2.

In addition, as shown in FIG. 3, if a band 8 with a ring 7 is provided at a suitable location on the holder 1 and a cord 9 connected to the cap 3 is passed through the ring 7, the holder 1 can be attached and removed easily. There is no risk of losing it.

Further, when used in a banked cylinder such as a V-type engine, a drain hole 10 may be made in the top plate portion 1a of the holder 1, as shown in FIG. If necessary, a suitable hole may also be made in the side plate portion 1b.

Next, another embodiment will be described with reference to FIG.

The holder 11 of this embodiment is for application to a straight cap 12, and the schematic configuration is the first one.
This is the same as the one shown in the figure, except that a cutout hole 13 is formed in the top plate portion 1a for penetrating and locking the body portion 12a of the cap 12. Other points are the same configuration as shown in Figure 1, so
The same reference numerals are used to omit the explanation. This notch hole 13
has the same shape as the notch 1c of the bottom plate 1d, and the diameter of the hole matches the diameter of the body 12a of the cap.

In the embodiment shown in FIG. 5, the means for locking the holder 11 to the cap 12 is formed by the cutout hole 13, but any means for locking one end of the holder to the cap may be used. For example, as a modification of the locking means, the locked portion and the locking portion may be integrated, and the holder may be provided integrally with the cap.

In any case, one feature of the present invention is that one end of the holder is engaged with the stepped part of the plug, and various structures can be adopted for locking the other end to the cap. It is.

In addition, in the above embodiment, a case was shown in which the upper stepped part was used as the engaged part on the plug 2 side, but
It goes without saying that the lower stepped portion may also be used.

[Effects of the invention] As explained above, according to the holder of the invention, the locking portion of the holder is locked to the cap,
By simply engaging the engaging portion of the holder with the plug, the holder restricts the cap from moving in the direction of coming out of the plug. Therefore, the connectivity of the cap can be strengthened. Additionally, this cap can be easily installed and removed for easy maintenance.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a state in which a holder according to an embodiment of the present invention is being fitted into a plug cap;
Fig. 2 is a side sectional view showing the holder in its fitted state, Figs. 3 and 4 are perspective views showing modifications of the same embodiment, and Fig. 5 is a plug cap holder of another embodiment of the present invention. It is a perspective view which shows the state which is about to fit. 1, 11... Holder, 1a... Top plate part (locking part), 1b... Side plate part (coupling part), 1c... Notch (engaging part), 1d... Bottom plate part, 1e... Opening part ,2
... Plug, 3, 12 ... Cap, 4 ... Engine body, 5 ... Stepped part, 6 ... Groove, 13 ...
Notch hole (locking part).

Claims (1)

[Scope of utility model registration request] A locking part that locks on the locked part of the cap, and an engaging part that engages with the stepped part of the plug exposed between the engine body and the hem of the cap when the cap is placed over the plug. Integrally connected by a connecting part,
A holder for a spark plug cap, wherein the length of the connecting portion is set in accordance with the distance between the locked portion of the cap and the stepped portion of the plug.