JP2551488Y2 - Distributor ventilation hole cap structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to improvements in distributor vent caps.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
A vent hole 2 is formed in the distributor cap 1 of the distributor to ventilate the inside of the distributor, and a vent hole cap 51 is covered on the outside of the vent hole 2 so that the vent hole cap 51 is provided. An air opening passage 52 communicating with the ventilation hole 2 and having an end open to the atmosphere is formed in the inside of the air hole 51. In the conventional structure, water is supplied to the air opening passage 52 of the ventilation hole cap 51. In this case, water enters the inside of the distributor cap 1 through the vent opening 2 through the open air passage 52, adheres to the electrodes in the distributor cap and the distribution electrodes of the rotor, and the secondary voltage leaks. As a result, there is a problem that engine malfunction or engine stall occurs.

In a distributor cap 55 as shown in FIG. 3, an air opening passage 56 is formed orthogonally to the ventilation hole 2. There is a problem that water enters the ventilation hole 2.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and it is an object of the present invention to provide a vent hole cap which can prevent water from entering a distributor. For the purpose, the gist of the present invention is to provide a vent hole cap having an atmosphere open passage covered outside a vent hole formed in a distributor cap,
Inside the ventilation hole cap, an internal connection passage communicating with the ventilation hole partitioned through the atmosphere opening passage and a partition,
An expansion chamber having a discharge port formed at a lower part thereof is formed in communication with a lower end of the internal connection passage and the air release path, and a discharge pipe is connected to the discharge port toward a lower side,
The cross-sectional area of each of the expansion chamber, the discharge port, and the discharge pipe is formed to have a larger diameter than the cross-sectional area of the atmosphere opening passage.

[0005]

The air opening passage formed in the ventilation hole cap communicates with the expansion chamber, and when water enters from the air opening passage, the water accumulates in the expansion chamber and is discharged from the discharge pipe through the discharge port. Water that is discharged to the outside and enters the internal connection passage that communicates with the ventilation hole can be prevented well, and water can enter the distributor.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional configuration diagram of a ventilation hole cap. A ventilation hole 2 for ventilation is formed in a distributor cap 1, and a ventilation hole cap 3 is covered outside the ventilation hole 2. . An open-to-atmosphere passage 4 whose end is open to the atmosphere is formed in the vent hole cap 3.
In this example, an internal connection passage 8 communicating with the ventilation hole 2 is formed in parallel with the open-to-atmosphere passage 4 via a partition 9 in a partitioned manner. The lower end of the internal connection passage 8 and the lower end of the open-to-atmosphere passage 4 are communicated with an expansion chamber 5 formed below the lower end, and the lower end of the partition 9 is suspended in the expansion chamber 5. A discharge port 6 is formed at a lower portion of the expansion chamber 5, and a discharge pipe 7 is connected to the discharge port 6 toward the lower side. In this example, the cross-sectional area of the expansion chamber 5, the discharge port 6, and the discharge pipe 7 is larger than the cross-sectional area of the atmosphere opening passage 4.

In such a structure, when water is splashed on the vent hole cap 3 and water enters through the open-to-atmosphere passage 4, the intruded water is accumulated in the expansion chamber 5 and discharged from the expansion chamber 5. It passes through the outlet 6 and is discharged outside through the discharge pipe 7. In this case, since the expansion chamber 5, the discharge port 6, and the discharge pipe 7 are formed to have a diameter larger than that of the air release passage 4, the water is discharged from the discharge pipe 7 as compared with the amount of water entering from the air release passage 4. Since the amount of water is larger, the expansion room 5
Since the water level of the water accumulated in the inside is low, the water does not rise to the upper side of the internal connection passage 8 and intrude therein, thereby preventing the water from intruding into the ventilation hole 2 side. In addition,
Since the partition portion 9 is formed so as to hang down into the expansion chamber 5, water does not flow from the open-to-atmosphere passage 4 to the internal connection passage 8 side. It is possible to prevent intrusion into the ventilation hole 2 side and satisfactorily prevent water from adhering to electrodes and the like in the distributor.

[0008]

According to the present invention, there is provided a vent hole cap having an air opening passage covered outside a ventilation hole formed in a distributor cap, wherein the air opening passage is provided in the vent hole cap. An internal connection passage communicating with the ventilation hole partitioned through a partition, and an expansion chamber having a discharge port at a lower portion communicating with a lower end of the internal connection path and the open-to-atmosphere path are formed, and the discharge port has A discharge pipe is connected to the lower side, and each of the cross-sectional areas of the expansion chamber, the discharge port, and the discharge pipe is formed to have a larger diameter than the cross-sectional area of the atmosphere-opening passage. Even if water invades from the open passage, the invading water can be satisfactorily discharged to the outside from the discharge pipe through the expansion chamber, and the water can be well prevented from entering the ventilation hole side. In the distributor No water penetration into, an effect that can satisfactorily prevent the occurrence of such engine trouble by adhering water to the electrode or the like in the distributor.

[Brief description of the drawings]

FIG. 1 is a cross-sectional configuration diagram of a ventilation hole cap.

FIG. 2 is a cross-sectional configuration diagram of a conventional vent hole cap.

FIG. 3 is a cross-sectional configuration diagram of a conventional ventilation hole cap.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Distributor cap 2 Ventilation hole 3 Ventilation hole cap 4 Open-to-atmosphere passage 5 Expansion room 6 Drain port 7 Drain pipe 8 Internal connection passage 9 Partition part

Claims (1)

(57) [Scope of request for utility model registration] 1. A vent hole cap having an atmosphere opening passage covered outside a ventilation hole formed in a distributor cap, wherein the vent hole cap is provided inside the ventilation hole cap with the air opening passage and a partition. An internal connection passage communicating with the partitioned ventilation hole, and an expansion chamber communicating with a lower end of the internal connection passage and the open air passage and having a discharge port at a lower portion are formed, and the discharge port is directed downward. A discharge pipe connected to the expansion chamber, the discharge port, and the discharge pipe having a cross-sectional area larger than a cross-sectional area of the open-to-atmosphere passage. Hole cap structure.