JPH0217159Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a high-voltage cord extraction structure for taking out a high-voltage cord for ignition from the air guide case of an air-cooled general-purpose engine.

A conventional high voltage cord extraction structure is shown in FIGS. 1 and 2 (see Utility Model Application No. 159628/1983). FIG. 1 shows an air-cooled general-purpose engine, in which an air guide case 12 is attached to the side of the engine body 10 using screws 11, and a flywheel 1 having a cooling fan 13 is installed inside the air guide case 12.
4, and an envelope 15 that is a molded body for the ignition coil.
A built-in coil device 16 is housed therein.
A high voltage cord 17 for ignition is led out from the envelope 15 and connected to a spark plug 18.

The air guide case 12 is provided with a take-out hole 19 consisting of a U-shaped groove with one end open, and the high-voltage cord 17 is inserted through a rubber grommet 21 slidably fitted into the take-out hole 19. It is taken out to the outside of the wind guide case 12.

The coil device 16 is fixed to the wind guide case 12 by screws 23 at the lower part of the iron core 22, as shown in FIG.

In addition, in FIG. 1, 25 is a fuel tank, 2
6 is a carburetor; 27 is a priming pump for supplying fuel from the fuel tank 25 to the carburetor 26 when starting the engine; 28 is a manual starter;
9 is a cylinder cover.

In the above configuration, cooling air 31 is sent from the cooling fan 13 in FIG. 2 to cool the cylinder.
The coil device 16 is also cooled by this, but depending on the environment where the engine is installed, rainwater or chemical solution may be mixed with the cooling air 31 and sent to the coil device 1.
High voltage cord lead-out portion 15a in the envelope 15 of No. 6
Also, it adheres to the root portion 17a of the high voltage cord 17, deteriorating the high voltage cord lead-out portion 15a and the root portion 17a, causing high voltage leakage, and reducing the reliability of the engine.

Furthermore, when assembling the coil device 16 to the wind guide case 12 with the screws 23, it is recommended to fit the grommet 21 into the high voltage cord 17 in advance and position the grommet 21 so that it corresponds to the extraction hole 19. Although it is preferable, since the grommet 21 stops at an arbitrary position in the longitudinal direction of the high voltage cord 17, it is difficult to position the grommet 21, which makes it troublesome to assemble the coil device 16 to the wind guide case 12. In addition, high voltage cord 17 was manually installed.
When a large external force is applied to the high-voltage cord 17, such as when the high-voltage cord 17 is pulled or a wooden handle is caught on the high-voltage cord 17, the grommet 21 easily falls off from the take-out hole 19 of the wind guide case 12.

This invention was made in order to eliminate the above-mentioned conventional drawbacks, and involves forming a grommet fitting protrusion on the high-voltage cord lead-out portion of the envelope of the coil device.
The high-voltage cord is attached to the high-voltage cord by fitting the grommet into the fitting protrusion, and the high-voltage cord has no leakage, easy assembly, and no grommet falling out from the extraction hole 19. The purpose is to provide.

Embodiments of this invention will be described below with reference to the drawings.

In FIG. 3, the same parts as in FIGS. 1 and 2 are given the same numbers, and detailed explanation thereof will be omitted.

A cylindrical fitting protrusion 33 is integrally formed on the high voltage cord lead-out portion 15a of the envelope 15 in FIG. 3 to cover the outer periphery of the high voltage cord 17. An inwardly extending portion 21a extending inwardly and an outwardly extending portion 21b extending outwardly are integrally formed, and the fitting hole 34 provided in the inwardly extending portion 21a is inserted into the fitting protrusion 3
3, the grommet 21 is attached to the high voltage cord 17. Grommet 21 above
As clearly shown in FIG. 4, a mounting groove 35 is provided in the mounting groove 35. The grommet 21 is attached to the air guide case 12 by slidingly fitting this mounting groove 35 into the extraction hole 19 shown in FIG. ing. The attached grommet 21 is positioned by being pressed against the cylinder cover 29 of the engine body 10 by fixing the air guide case 12 to the side of the engine body 10.

In the above configuration, the high voltage cord lead-out portion 15a in FIG. 3 and the air guide case 1 in the high voltage cord 17
Since the root portion 17a located inside the cord 2 is covered by the grommet 21, chemical solution such as rain water mixed with the cooling air 31 is prevented from adhering to the high voltage cord lead-out portion 15a and the root portion 17a.
The high voltage cord lead-out portion 15a and the root portion 17a
This prevents high voltage leaks due to deterioration. Therefore, the waterproofing of the high-voltage cord lead-out section 15a is also simplified compared to the conventional method.

Further, since the grommet 21 is attached to the high voltage cord 17 by being fitted into the fitting protrusion 33 of the envelope 15, the grommet 21 is made to correspond to the extraction hole 19 by the above fitting, and the high voltage code 1
7 can be automatically positioned in the longitudinal direction.

Furthermore, since the grommet 21 is supported at two places, the fitting protrusion 33 of the envelope 15 and the take-out hole 19 of the air guide case 12, this support is strong, so that a large external force is not applied to the high voltage cord 17. Even if the grommet 21 acts, the grommet 21 will not fall out from the extraction hole 19.

6 to 8 show other embodiments of this invention. In FIG. 6, the grommet 21 is provided with a guide surface 36, and as shown in FIG.
The grommet 21 is connected to the fitting protrusion 33 of the envelope 15.
When the guide surface 36 is located between the envelope 15 and the air guide case 12 and is fitted to the outlet hole 19 of the air guide case 12, the cooling air 31
is smoothly guided from the wind guide case 12 to the engine main body 10, as shown in FIG. This facilitates cooling of the coil device 16 and the engine body 10.

Further, as in each of the above embodiments, by making the fitting protrusion 33 of the envelope 15 and the fitting hole 34 of the grommet 21 fit in an uneven manner, it is possible to further improve the sealing performance of the fitting portion. can.

As explained above, according to this invention, high voltage leakage is prevented, so the reliability of the engine is improved. Furthermore, when the grommet 21 is attached to the high voltage cord 17, the grommet 21 is automatically positioned relative to the high voltage cord 17, so the coil device is guided while attaching the grommet attached to the high voltage cord to the outlet hole of the wind guide case. When assembling to the wind case, this assembly becomes easy. Furthermore, the grommet is effectively prevented from falling out of the extraction hole.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a conventional example, Fig. 2 is a front view seen from the - line in Fig. 1, Fig. 3 is a front view corresponding to Fig. 2 showing an embodiment of this invention, and Fig. 4 The figure is a perspective view showing the grommet in Fig. 3, Fig. 5 is an exploded side view showing the main parts of Fig. 3, Fig. 6 is a perspective view showing the grommet in another embodiment, and Fig. 7 is the same embodiment. FIG. 8 is a front view taken from the - line in FIG. 7. 10... Engine body, 12... Wind guide case,
13...Cooling fan, 15...Envelope, 16...
Coil device, 17... High voltage cord, 15a... High voltage cord lead-out portion, 19... Takeout hole, 21... Grommet, 31... Cooling air, 33... Fitting protrusion, 3
6...Information surface.

Claims (1)

[Claims for Utility Model Registration] (1) An engine cooling fan 13 and a coil device 16 having an ignition coil built into the envelope 15 are housed in the wind guide case 12, and the ignition coil is provided from the envelope 15. A high-voltage cord 17 is led out, and on the other hand, a take-out hole 19 consisting of a U-shaped groove with one end open is provided in the wind guide case 12, and the high-voltage cord 17 is slid into the take-out hole 19. In the structure for taking out the high voltage cord to the outside of the wind guide case 12 through the grommet 21, a fitting protrusion 33 of the grommet 21 is formed in the high voltage cord lead-out portion 15a of the envelope 15, and the grommet 21 is connected to the A high-voltage cord extraction structure characterized in that the high-voltage cord 17 is attached to the high-voltage cord 17 by being fitted into a fitting protrusion 33. (2) Utility model registration claim 1, in which the grommet 21 has a guide surface 36 that smoothly guides the cooling air 31 from the air guide case 12 to the engine body 10
High-voltage cord extraction structure as described in section.