JPS6118628Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a connection terminal for a high voltage cord that is connected to a spark plug installed in the engine of a car, etc., specifically, a spark plug is installed deep into the engine head cover. Regarding the air release of the connection terminal of the high voltage cord used in the model.

(Prior Art) In this type of model, the high-voltage cord is deeply inserted and connected to the narrow spark plug mounting hole, and the area around the spark plug is completely sealed. If exposed to air, the internal pressure will increase, and there is a risk that the high-voltage cord's connecting terminal will come off and fly out while the vehicle is running, so it is essential to vent air from the high-voltage cord's connecting terminal.

For this reason, the conventional high voltage cord had the structure shown in FIG. That is, in the connection terminal A of the high voltage cord, the seal part B that covers the covered wire G and the connector H is inserted into the mounting hole I of the spark plug, and the upper end of the seal part B is fitted to the edge of the mounting hole I. A grommet portion C is formed, and a cap D is connected to this grommet portion C. In addition, an O-ring or annular rib E that fits tightly into the mounting hole I is attached to the seal part B, and the air flow path passes through the gap between the mounting hole I and the seal part B, and the O-ring E It is connected to the outside air through a small hole F which rises up the surface of the covered wire G in the seal part B and opens into the cap D near the bottom of the cap.

(Problem that the invention aims to solve) However, since the spark plug is installed deep within a narrow installation hole with a diameter of 25 mm or less, there is a limit to the thickness of the connection terminal, and for this reason, this structure However, if the required voltage of the spark plug is high, not only is there a possibility of leakage, but the connection between the grommet part of the connection terminal and the cap and the air vent flow path are also complicated, and in addition, it is necessary to ensure close contact with the mounting hole. There were drawbacks such as the need to install O-rings, etc.

This invention improves the drawbacks of the conventional ones mentioned above, and although the structure of the connection terminal and the structure of the air vent passage are simple, it is possible to bleed air reliably, is waterproof, and has electrical resistance. The objective is to obtain a high-voltage cord that has high insulation properties, does not leak even when high voltage is applied, can be installed reliably, and is absolutely free from popping out.

(Means for solving the problem) The cap part, which has a grommet that fits tightly to the engine head cover, and the seal part are integrally molded, and the seal part has multiple ring-shaped ribs protruding from it that fit tightly to the side of the mounting hole. At the same time, slits are formed at different positions on the circumferential edges of these ribs, and slits are similarly formed on the lower surface of the grommet.

(Function) With the above configuration, the multiple ribs of the seal part are in close contact with the mounting hole, and the slits allow the inside of the mounting hole to communicate with the outside air, and the slits provided in the multiple ribs are located at different positions on the circumference of the ribs. Since the grommet is provided with a slit in the umbrella-shaped lower surface of the grommet, it is possible to form a curved passageway and thereby prevent water from entering from the outside.Furthermore, since a slit is provided on the umbrella-shaped lower surface of the grommet part, air can be easily released from the inside. The slit is blocked by a grommet to prevent water from entering from the outside.

(Embodiment) To explain in detail an embodiment of the configuration of this invention shown in the drawings, the covered electric wire 1 at the spark plug side end of the high voltage cord and the connector 2 connected to the tip thereof
is covered with a connecting terminal 3 made of insulating synthetic resin, and this connecting terminal 3 has an upper cap part 4.
Next, there is an umbrella-shaped grommet part 5 that fits into the upper end of the engine cover 10, and a cylindrical seal part 6 that is inserted into the spark plug mounting hole 11 is formed below the grommet part 5. Seal part 6
is provided with two or three stages of ring-shaped ribs 7 that are tightly fitted to the inner wall surface of the mounting hole 11, and at different positions on the circumference of the rib 7 (for example, 180 degrees for two stages, A slit 8 is recessed in the vertical direction at an angle of 120° for three stages, and a single slit 9 is recessed in the umbrella-shaped lower surface of the grommet portion 5 so as to communicate with the outside.

Since the embodiment is configured in this way, when the connecting terminal 3 is inserted into the mounting hole 11, the rib 7 is tightly fitted to the inner wall surface of the mounting hole 11, and the grommet portion 5 is attached to the upper end of the mounting hole 11. Since the fitting is fixed, air passes through the gap between the mounting hole 11 and the seal part 6 in stages through the bending passage connecting the slit 8 of each rib 7, and then exits from the slit 9 in the umbrella-shaped lower part of the grommet part 5. is released in communication.

(Effects of the invention) As described above, in this invention, the air flow path is configured to pass through the outer surface of the connection terminal, and multiple ribs are formed, so although the structure is simple, It can be tightly fixed to the inner wall surface of the mounting hole, and the slit that forms a bending passage allows for reliable air ventilation.In addition, it prevents water from entering from the outside, so the high-voltage cord does not jump out and contaminate the inside. It can be reliably connected to the spark plug without any interference.

Furthermore, even if the mounting hole around the spark plug is narrow (25 mm or less), the connecting terminal can be made of silicone rubber with a thickness of about 4 mm and a structure that can withstand a high voltage of 40 KV, making it durable. It has various excellent effects such as being able to improve leakage properties.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of this invention, Fig. 2 is a longitudinal sectional side view of the main part, Fig. 3 is a transverse plan view taken along line A-A in Fig. 2, and Fig. 4 is a side view of the embodiment of this invention. , a cross-sectional plan view taken along line B--B, and FIG. 5 a vertical cross-sectional side view of the conventional example. 3... Connection terminal, 4... Cap part, 5... Grommet part, 6... Seal part, 7... Rib, 8,
9... Slits.

Claims (1)

[Scope of utility model registration request] At the end of the high-pressure cord on the spark plug side, a cap part with a grommet part that fits tightly to the engine head cover, and a seal part below the cap part to be inserted into the installation hole of the spark plug are integrally molded. A plurality of ring-shaped ribs protrude from the side surface of the mounting hole, and slits are formed at different positions on the circumference of the ribs. A high-voltage cord spark plug connection terminal with a recessed slit that communicates with the.