JP6001521B2 - Vent pipe open structure - Google Patents

Description

  The present invention relates to an open structure of a vent pipe, for example, an open atmosphere structure of a vent pipe connected to a canister.

  For example, a vent pipe (drain hose) communicating with the outside is connected to a fuel tank of an automobile via a canister. When the fuel vaporizes in the fuel tank and the internal pressure rises, the vaporized fuel is discharged to the outside of the fuel tank through the vent pipe, so that the increase in internal pressure is suppressed. The gaseous fuel discharged from the fuel tank is captured by the canister, and the discharge of the fuel to the outside of the automobile is suppressed. Further, the fuel trapped in the canister is supplied to the engine by air (outside air) taken in through the vent pipe.

  If one end of the vent pipe is open to the outside, foreign matters such as insects (for example, moths) may enter the vent pipe from this opening. Therefore, for example, a technique described in Patent Document 1 is known in order to prevent foreign matter from entering the ventilation pipe. Patent Document 1 describes that a hose connector connected to a hose is provided with a lattice-like filter that prevents intrusion of spiders or the like at the open end of the hose connector.

Japanese Patent No. 3655151

  In the technique described in Patent Document 1, if the filter lattice is increased in order to reduce the airflow resistance, foreign matter is liable to enter the air pipe. Therefore, if the filter lattice is reduced, the ventilation resistance of the filter increases, and sufficient ventilation may not be achieved. The present invention has been made in view of such a problem, and the problem is to provide an open structure of a vent pipe capable of preventing foreign matter from entering the vent pipe while reducing the ventilation resistance. .

  As a result of intensive studies to solve the above problems, the present inventors have found the following findings. That is, the invention according to claim 1 is an open structure of the other end of the vent pipe in one end of the vent pipe connected to the structure of the automobile, One ventilation slit is formed, and a cover member having a second ventilation slit formed on a side surface is attached to the other end of the ventilation pipe so as to cover the opening of the first ventilation slit and the ventilation pipe. The present invention relates to a vent pipe open structure.

  According to this, since the cover member in which the second ventilation slit is formed is attached so as to cover the first ventilation slit of the ventilation pipe, the labyrinth structure can be formed inside the cover member. Therefore, even if a foreign object enters the inside of the cover member through the second ventilation slit of the cover member, the outer surface of the ventilation pipe is disposed facing the second ventilation slit, so that the ventilation pipe in the back Intrusion of foreign matter inside is prevented. In particular, it is possible to prevent the intrusion of spiders and prevent the spiders from forming nests in the vent pipe. Thereby, the ventilation resistance raise by nest formation can be prevented. Further, the inside and outside communicate with each other by the first ventilation slit of the ventilation pipe and the second ventilation slit of the cover member so that the ventilation resistance can be sufficiently communicated, so that the ventilation resistance can be reduced.

  In the invention according to claim 2, the first ventilation slit and the second ventilation slit are formed so that the first ventilation slit and the second ventilation slit intersect.

  According to this, foreign matter that has passed through the second ventilation slit can be prevented from directly entering the inside of the ventilation pipe through the first ventilation slit, and entry of foreign matter can be more reliably prevented.

  In the invention according to claim 3, a clearance is formed between the outer surface of the vent pipe and the inner surface of the cover member, and the width of the clearance is narrower than the width of the second vent slit. .

  According to this, even if a foreign object reaches the outer surface of the ventilation pipe through the second ventilation slit of the cover member, the clearance width formed between the outer surface of the ventilation pipe and the inner surface of the cover member. Therefore, it is possible to prevent the foreign matter from invading further. In addition, a sufficient ventilation path is formed by providing the clearance, and the ventilation resistance can be reduced.

  In the invention according to claim 4, a vent hole is formed in the cover member at a portion covering the opening of the vent pipe, and the diameter of the vent hole is smaller than the width of the second vent slit.

  According to this, ventilation resistance can be further reduced by performing sufficient ventilation through the ventilation hole. Moreover, since the size of the vent hole is smaller than the width of the second vent slit formed in the cover member, it is possible to prevent foreign matter from entering the vent pipe through the vent hole.

  ADVANTAGE OF THE INVENTION According to this invention, the open | release structure of the vent pipe which can prevent the foreign material penetration | invasion to the inside of a vent pipe can be provided, reducing ventilation resistance.

It is an external appearance perspective view of the open structure of the drain hose of this embodiment. It is a disassembled perspective view of the open structure of the drain hose of this embodiment. FIG. 2 is a cross-sectional perspective view taken along line AA in FIG. 1. FIG. 5 is an end view taken along line BB in FIG. 4. It is the elements on larger scale of the open structure of the drain hose of this embodiment.

  Hereinafter, although the form (this embodiment) for implementing this invention is demonstrated, this embodiment is not limited to the following examples.

  First, components of the drain hose opening structure of the present embodiment will be described with reference to FIGS. 1 and 2.

  FIG. 1 is an external perspective view of the open structure of the drain hose 30 of the present embodiment. The drain hose joint 1 shown in FIG. 1 is connected to a drain hose 30, and the drain hose 30 is connected to a canister (vehicle structure) (not shown). The end of the drain hose joint 1 opposite to the side connected to the drain hose 30 (open end 2, see FIG. 2) is open to the outside. That is, the canister communicates with the outside through the drain hose 30 and the drain hose joint 1. Thereby, exhaust from the canister and ventilation to the canister are possible. Further, the drain hose joint 1 is fixed to the vehicle body frame of the automobile by a flange 20.

  A cylindrical cover member 10 is attached to the drain hose joint 1 in order to prevent foreign matter from entering the drain hose joint 1 and the drain hose 30. However, although details will be described later, a vent slit 13 and a vent hole 14 are formed in the cover member 10 so that the drain hose 30 can be vented.

  The cover member 10 is provided so as to cover the cylindrical housing 11 mounted so as to accommodate the drain hose joint 1 and the open end 2 (see FIG. 2) of the drain hose joint 1. It is comprised by the front-end | tip member 12 comprised by comprising. A plurality of ventilation slits 13 formed in a direction perpendicular to the air flow in the drain hose joint 1 and a fixing hole 15 for fixing the cover member 10 to the drain hose joint 1 are formed in the cylindrical housing 11. ing. This ventilation slit 13 enables good ventilation inside and outside the drain hose 30. In addition, a plurality of vent holes 14 are formed in the tip member 12 in order to allow better ventilation of the drain hose 30.

  FIG. 2 is an exploded perspective view of the open structure of the drain hose 30 of the present embodiment. On the upper and lower outer surfaces of the drain hose joint 1, ribs 6 are provided extending outward so that a clearance (details will be described later with reference to FIG. 4) can be formed between the drain hose joint 1 and the cover member 10. ing. A plurality of ventilation slits 3 are provided in the vicinity of the open end 2 of the drain hose joint 1 in a direction parallel to the air flow in the drain hose joint 1 (that is, in a direction orthogonal to the ventilation slit 13 of the cover member 10). Is formed.

  Further, the drain hose joint 1 is formed with a convex portion 4 for fixing the cover member 10 to the drain hose joint 1 by fitting in the fixing hole 15 of the cover member 10. That is, the protrusion 4 is fitted into the fixing hole 15 of the cover member 10, so that the cover member 10 is mounted and fixed to the drain hose joint 1. Further, the drain hose joint 1 has a hook 5 for stopping the cover member 10 so that the ventilation slits 3 and 13 are in a desired position when the cover member 10 is inserted over the drain hose joint 1 and inserted. Is formed.

  A method for attaching the cover member 10 to the drain hose joint 1 will be described. When the cover member 10 is inserted along the drain hose joint 1 having a drum-shaped cross section, the convex portion 4 of the drain hose joint 1 is buried by a pressing force generated by the slope formed on the convex portion 4. At the same time, the cover member 10 slides on the buried convex portion 4. Then, when the end portion of the cover member 10 contacts the flange 5 and the convex portion 4 reaches the position of the fixing hole 15 of the cover member 10, the convex portion 4 elastically jumps up and fits into the fixing hole 15. Thereby, the cover member 10 is attached and fixed to the drain hose joint 1. When removing the cover member 10, the cover member 10 can be removed by pulling it out of the drain hose joint 1 while pressing down the convex portion 4 fitted in the fixing hole 15.

  Next, the structure inside the cover member 10 when the cover member 10 is attached to the drain hose joint 1 will be described with reference to FIGS. 3 and 4.

  In the following description, the flow of air in the open structure of this embodiment will be mainly described by taking as an example the case where the internal pressure of the fuel tank rises and air flows from a canister (not shown) to the outside. When the fuel in the canister (fuel adsorbed by the canister) is returned to the engine, the air taken in from the outside in the direction opposite to the air flow described below (that is, the direction from the outside toward the canister). Will flow.

  FIG. 3 is a cross-sectional perspective view taken along line AA of FIG. As shown in FIG. 3, a clearance 16 having a width L <b> 3 is formed between the outer surface of the vent pipe 1 and the inner surface of the cover member 10. Therefore, when the gas from the canister flows toward the open end 2, the gas flows into the clearance 16 through the ventilation slit 3 of the ventilation pipe 1. The gas flowing into the clearance 16 is exhausted to the outside through the ventilation slit 13 of the cover member 10. Incidentally, the gas from the canister is obtained after the fuel vapor is adsorbed and removed by activated carbon or the like in the canister.

  Further, the vent member 14 is formed in the tip member 12 of the cover member 10 as described above. Therefore, the gas from the canister is discharged to the outside through the vent hole 14. As described above, in this embodiment, exhaust can be performed in two systems, that is, exhaust to the outside through the vent slits 3 and 13 and exhaust to the outside through the vent hole 14. In particular, since each system is provided so as to go in the downstream direction of the airflow from the canister, it can be discharged to the outside without going against the flow of the airflow. Therefore, ventilation resistance can be reduced satisfactorily and the load on the canister can be reduced.

  In addition, in the drain hose opening structure of the present embodiment, in addition to reducing ventilation resistance, entry of foreign matter from the outside is also prevented. That is, as shown in FIG. 3, the cover member 10 is formed with a ventilation slit 13 and a ventilation hole 14. These are all small. Therefore, the provision of these makes it difficult for foreign matter to enter from the outside.

  However, in this embodiment, the width L2 of the ventilation slit 13 (see also FIG. 5) is larger than the diameter L1 of the ventilation hole 14 in order to increase the effect of reducing the ventilation resistance. Therefore, a foreign substance that cannot pass through the vent hole 14 but can pass through the vent slit 13 may enter the inside of the cover member 10 through the vent slit 13. Accordingly, a clearance 16 having a width L3 is provided inside the ventilation slit 13 of the cover member 10 so that the outer surface of the drain hose joint 1 is disposed. That is, the inside of the cover member 10 has a so-called labyrinth structure in which foreign matter is difficult to enter.

  Accordingly, even if foreign matter enters the cover member 10 through the ventilation slit 13 of the cover member 10, the inside of the drain hose joint 1 has a labyrinth structure due to the outer surface of the drain hose joint 1. Is hard to penetrate. Furthermore, since the ventilation slit 3 of the drain hose joint 1 is formed in a direction orthogonal to the ventilation slit 13 of the cover member 10, the presence of both the ventilation slit 13 and the ventilation slit 3 results in the labyrinth. The structure can be made more complex and foreign matter can be prevented more reliably.

  FIG. 4 is an end view taken along line BB in FIG. That is, FIG. 4 is an end view obtained by cutting the drain hose joint 1 and the cover member 10 in a direction perpendicular to the air flow direction from the canister. As described above, the outer surface of the drain hose joint 1 and the inner surface of the cover member 10 are separated from each other, and a clearance 16 is formed therebetween. Since the clearance 16 is formed, a sufficiently wide ventilation path can be formed, and the ventilation resistance can be reduced.

  In the present embodiment, the clearance width L3 is shorter than the width L2 of the ventilation slit 13 formed in the cover member 10. That is, the clearance 16 is narrower than the ventilation slit 13. Therefore, even if a foreign object enters the cover member 10 through the ventilation slit 13, the width L3 of the clearance 16 between the inner surface of the cover member 13 and the outer surface of the drain hose joint 1 is sufficiently short. Intruders cannot move any further. Thereby, foreign substance intrusion into the drain hose joint 1 can be more reliably removed while reducing the airflow resistance.

  Further, the rib 6 formed on the outer surface of the drain hose joint 1 is in contact with the inner surface of the cover member 10. As a result, the clearance 16 is formed as described above, the ventilation resistance is reduced, and the cover member 10 is fixed to the drain hose joint 1 without wobbling.

  FIG. 5 is a partially enlarged view of the open structure of the drain hose 30 of the present embodiment. FIG. 5 shows the cover member 10 viewed from the side. In FIG. 5, the broken line is an imaginary line showing the shape of the drain hose joint 1. However, for simplification of illustration, illustration of a part of the shape is omitted, and visible parts are also indicated by virtual lines.

  As described above, the ventilation hose 3 is formed in the drain hose joint 1, and the ventilation slit 13 is formed in the cover member 10. The ventilation slit 3 and the ventilation slit 13 are formed to face each other so as to be orthogonal to each other. In particular, in this embodiment, as shown in FIG. 5, the ventilation slits 13 of the cover member 10 are formed more than the ventilation slits 3 of the drain hose joint 1.

  This mainly considers the ease of gas flow. That is, since the drain hose joint 1 has a large-diameter open end 2 through which gas is particularly easy to pass, it is not necessary to provide a large number of ventilation slits 3 on the side surface of the drain hose joint 1. On the other hand, since the cover member 10 is closed by joining the drain hose joint 1 and the like except for the ventilation slits 13, more ventilation slits 13 are formed in order to ensure a sufficient amount of exhaust. Yes. Therefore, by forming the ventilation slits 3 and 13 in this way, in addition to the effect of preventing foreign matter from entering, the ventilation resistance can be further reduced.

Although the present embodiment has been described above, the present embodiment is not limited to the above example.
For example, in the above-described embodiment, the drain hose connecting the drain hose joint 1 is connected to the canister.

  Further, the structure and shape of the drain hose joint 1, the number of ventilation slits 3 to be formed, the structure and shape of the cover member 10, the number of ventilation slits 13 to be formed and the number and shape of the ventilation holes 14 are also included in the gist of the present invention. Any change can be made without departing from the scope of the invention. For example, the vent slit 3 and the vent slit 13 are more preferably formed in a direction orthogonal to each other as described above, but it is also preferable that the vent slit 3 and the vent slit 13 intersect each other. For example, the vent slit 3 and the vent slit 13 may intersect with a certain angle. .

  Further, the width of the ventilation slit 3 and the width of the ventilation slit 13 are not necessarily the same, and can be appropriately changed. However, when the width of the ventilation slit 3 is different from the width of the ventilation slit 13, the width of the ventilation slit 3 formed in the drain hose joint 1 is narrow from the viewpoint of more surely preventing foreign matter from entering the drain hose joint 1. It is preferable to become.

  Furthermore, the attachment method of the cover member 10 to the drain hose joint 1 is preferably a method that is difficult to come off by vibration because it is attached to an automobile. Specifically, although the method of the above embodiment is preferred, the attachment method Is not limited to the above example. For example, a simpler mounting structure may be used from the viewpoint of ease of inspection, and a more rigid mounting structure may be used from the viewpoint of making it more difficult for the vibration to come off.

  In the above-described embodiment, the vent hole 14 is provided only in the tip member 12 constituting the cover member 10, but may be provided as appropriate on the side surface of the cover member 10 (that is, the cylindrical housing 12). . As a result, the ventilation resistance can be further reduced.

1 Drain hose (vent pipe)
3 Ventilation slit (first ventilation slit)
10 Cover member 13 Ventilation slit (second ventilation slit)
14 Vent

Claims (4)

In the vent pipe, one end of which is connected to an automobile structure, an open structure of the other end of the vent pipe,
A first ventilation slit is formed on a side surface of the other end of the ventilation pipe,
A cover member having a second ventilation slit formed on a side surface is attached to the other end of the ventilation pipe so as to cover the opening of the first ventilation slit and the ventilation pipe. Open structure of trachea.   2. The vent pipe opening according to claim 1, wherein the first ventilation slit and the second ventilation slit are formed so that the first ventilation slit and the second ventilation slit intersect each other. Construction. A clearance is formed between the outer surface of the vent pipe and the inner surface of the cover member,
3. The vent pipe opening structure according to claim 1, wherein a width of the clearance is shorter than a width of the second ventilation slit. 4. The cover member is formed with a vent hole in a portion covering the opening of the vent pipe,
The vent pipe opening structure according to any one of claims 1 to 3, wherein a diameter of the vent hole is smaller than a width of the second vent slit.

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