JP2000344060A - Ventilation structure of washer tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure both high ventilation properties and anti-liquid spill properties with its structure simplified. SOLUTION: A kerf 32 is formed up in a packing 3 assembled with the inner side of a cap 2 having a vent hole 23. Paired pedestal parts 24 are formed at both the sides of a groove 25 communicating the kerf 32 with the vent hole 23 in the inner surface of the cap 2. When the inside of a washer tank 1 is negative in pressure, the packing 3 is inwardly deformed, and since there is a gap in the kerf 32, the inside of the washer tank 1 can be kept at atmospheric pressure. When the packing 3 is subjected to positive pressure by means of washing in the washer tank 1, since the packing 3 will never be deformed even if it is hit against the pedestal 24, there will never be any gap in the kerf 32, and washing is hardly spilled out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washer tank of a vehicular washer device for spraying a cleaning liquid onto a surface to be cleaned such as a windshield of an automobile, and more particularly to a ventilation structure of a washer tank.

[0002]

2. Description of the Related Art Generally, a vehicle is provided with a washer device for spraying a cleaning liquid onto a surface to be cleaned such as a windshield when wiping with a wiper. The washer device includes a washer tank in which the cleaning liquid is stored, and the cleaning liquid in the washer tank is pressure-fed by a washer pump attached to the washer tank to inject the cleaning liquid from the washer nozzle.

[0003] A cap (lid) is attached to the water inlet of the washer tank so that the cleaning liquid does not leak. A vent is formed in the cap so that the inside of the washer tank communicates with the outside atmospheric pressure so that the inside of the washer tank does not become negative pressure when the washer pump injects the cleaning liquid.

[0004] However, the ventilation holes make it easy for the washing liquid inside to leak due to the vibration or inclination of the washer tank, and the liquid leakage resistance of the cap is reduced. In particular, when the washer tank is disposed in the vehicle interior, it is necessary to sufficiently increase the liquid leakage resistance.

For example, a vehicle (truck) 8 shown in FIG.
Reference numeral 1 denotes a mechanism for tilting (tilting) the vehicle compartment 82, and a washer tank is mounted inside the vehicle compartment 82. In this case, when the liquid level in the washer tank 83 is located above the cap 84 when the casing 82 is tilted, the cleaning liquid in the washer tank 83 is
Leaks from the vent holes of the vehicle.

In order to solve this problem, a packing 91 is conventionally provided inside a cap 90 as shown in FIG.
And a structure in which a cross-shaped (or one-shaped) cut groove (cut) 93 is provided in the packing 91 at a position substantially 180 degrees opposite to the vent hole 92 of the cap 90. When the washing liquid is jetted by the washer pump and the pressure in the washer tank becomes negative, the packing 91 is deformed by the negative pressure, and a gap is formed in the cut groove 93 to ensure air permeability. on the other hand,
Since the cut groove 93 is a mere cut, it is normally closed and the liquid leakage resistance is improved. Further, the ventilation hole 92 and the cut groove 93 were located on the opposite side of about 180 degrees, and liquid leakage to the ventilation hole 92 was hard to occur.

Japanese Patent Application Laid-Open No. 61-96274 discloses a porous material 9 made of a water-repellent material as shown in FIG.
There is disclosed that a ventilation valve 97 having a plate-like structure in which an elastic material 96 such as rubber is integrated around the perimeter 5 as a packing at an opening 98 a of a container 98 and a lid 99 is provided. The ventilation valve 97 attached to the mouth 98a of the container 98 functions as a seal packing that allows gas to pass through the porous material 95 and does not allow liquid to pass through. This ventilation valve 97
When used as packing in a washer tank, high air permeability and liquid leakage resistance can be obtained.

[0008]

However, FIG.
In the structure shown in (1), since there is a space (recessed portion of the cap) for the ventilation path between the packing 91 and the bottom surface of the cap 90, the packing 91 can be deformed upward. For example, the washer tank is tilted when the passenger compartment is tilted, and the level of the cleaning liquid inside the tank is higher than the cap, or the head of the cleaning liquid hits the packing 91, etc.
When a small positive pressure is generated in the packing 91, the packing pressure may deform the packing 91 toward the cap 90, and a gap may be formed in the cut groove 93, so that the cleaning liquid may leak.

In addition, according to the structure shown in FIG. 20, it is difficult to integrate the elastic material 96 such as rubber around the porous material 95, and the production cost is high. In addition, the porous material 9
In the case of No. 5, since care must be taken so as not to cause damage and the vent valve 97 must be handled relatively carefully, it cannot be adopted in a washer tank at present.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a ventilation structure for a washer tank which has a simple structure and can ensure high ventilation and liquid leakage resistance. To provide.

[0011]

According to the first aspect of the present invention, there is provided a lid which is attached to an inlet of a washer tank and has a ventilation hole, and which is disposed inside the lid. A gasket having a cut-out portion allowing communication between the ventilation hole of the lid and the inside of the washer tank; and a regulating means for preventing a portion of the gasket near the cutout portion from being deformed toward the lid. The gist is to have

According to a second aspect of the present invention, in the first aspect, the regulating means is provided so as to be capable of regulating the position on both sides near the cut portion of the packing.

According to the third aspect of the present invention, a lid attached to the inlet of the washer tank and having a ventilation hole, and the lid disposed inside the lid and having the ventilation hole and the washer formed therein. A packing having an opening communicating with the inside of the tank, the inside of the washer tank and the ventilation hole of the lid are communicated with each other when the pressure in the washer tank is negative, A valve means for opening and closing the opening so as to establish communication is provided.

According to the fourth aspect of the invention, the first to third aspects are provided.
In the invention described in any one of the above, the lid and the packing are such that the ventilation hole, the cutout portion or the opening are located on opposite sides of a center of the lid. Characterized by being arranged in

(Operation) According to the first aspect of the present invention,
When the pressure in the washer tank becomes negative, the packing deforms downward and a gap is formed in the cut portion, so that high air permeability is ensured. Further, when the pressure in the washer tank becomes positive, the position of the packing is regulated by the regulating means in the vicinity of the cut portion, so that a gap is hardly formed in the cut portion, and the liquid leakage resistance is improved. Therefore, high air permeability and liquid leakage resistance are secured with a simple structure.

According to the invention described in claim 2, according to claim 1
In addition to the effect of the invention described in the above, the position of the packing is regulated on both sides near the cut portion by the restricting means, so that a gap is less likely to be formed in the cut portion at the time of positive pressure, and the liquid leakage resistance is further improved. .

According to the third aspect of the present invention, when the pressure inside the washer tank is negative, the valve means functions to open the opening to communicate the inside of the washer tank with the atmosphere, so that the air permeability is ensured. You. Further, when the pressure in the washer tank is positive, the valve means functions to close the opening and the inside of the washer tank is sealed, so that the liquid in the washer tank is prevented from leaking to the outside. Therefore, high air permeability and liquid leakage resistance are secured with a simple structure.

According to the invention of claim 4, according to claim 1,
In addition to the effects of the invention described in any one of (1) to (3),
Since the passage connecting the inside of the washer tank and the outside atmosphere through the ventilation hole of the lid has a maze shape, the liquid leakage resistance is further improved.

[0019]

(First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, a washer tank 1 has a tubular inlet 11 extending therefrom. A cap 2 serving as a lid seals a liquid inlet (water inlet) 12 with a packing 3. It is fitted into the inlet 11 in this state. That is, the locking recess 21 on the inner peripheral wall of the cap 2
And the engaging projection 13 at the distal end of the outer peripheral surface of the inlet portion 11 is engaged with the engaging portion. The washer tank 1 and the cap 2 are both made of resin, and the packing 3 is made of an elastic material such as rubber. A washer pump is provided below the washer tank 1 in a state where the washer pump is connected to an outlet (both not shown), and the washing liquid in the washer tank 1 is pumped to the outside through a pipeline by driving the washer pump. The fuel is injected from a washer nozzle (not shown) of the vehicle.

FIG. 2 is a plan view of the inner surface of the cap 2. As shown in FIG. 1 and FIG.
Are integrally attached to the inner surface side of the. At the center of the inner surface of the cap 2, a vertically projecting locking projection 22 is formed, and at the center of one packing 3, a locking hole 31 is formed. Then, the packing 3 is controlled by the locking projection 22 inserted into the locking hole 31 so as to have a regulating portion 22a at the tip thereof.
Is held on the inner surface of the cap 2 in a state where it is prevented from falling off. The packing 3 has an outer diameter at which the outer peripheral edge is disposed in the locking recess 21 of the cap 2, and can be sealed so as to cover the entire front end surface of the inlet 11.

As shown in FIGS. 1 and 2, the cap 2 is provided with a vent hole 23 at one location near the outer periphery. Further, the packing 3 is formed with a cross-shaped groove 32 as a cut portion at one location near the outer periphery. The packing 3 is attached to the cap 2 in such a direction that the cut groove 32 is disposed at a position approximately 180 degrees opposite to the vent hole 23 with respect to the center of the cap 2.

As shown in FIG. 2, a pair of pedestals 24 is formed on the inner surface of the cap 2 as regulating means.
The pair of pedestal portions 24 are semicircular thick portions located at a predetermined distance from each other, and a linear groove 25 connecting the ventilation hole 23 and the cut groove 32 is formed between them. FIG.
As shown in the figure, the packing 3 is attached to each base 24 of the cap 2.
Is held in contact with the lower surface of the washer tank 1
Although deformation inside is permitted, deformation toward the cap 2 side is regulated by each pedestal portion 24. The washer tank 1 of the present embodiment is mounted in a vehicle compartment 82 of a vehicle 81 such as a truck in which the vehicle compartment 82 tilts as shown in FIG.

Next, the operation of the ventilation structure of the washer tank 1 will be described. When the washing liquid in the washer tank 1 is pressure-fed to the washer nozzle by the washer pump, the pressure in the washer tank 1 becomes negative. As a result, as shown in FIG. 4, the packing 3 is deformed toward the inside of the washer tank 1 to form a gap in the incision 32, and air is introduced into the washer tank 1 through the gap and the vent hole 23, and the washer is formed. The inside of the tank 1 is maintained at the atmospheric pressure.

On the other hand, when the cabin 82 of the vehicle 81 is tilted as shown in FIG.
The liquid level of the cleaning liquid in the washer tank 1 becomes higher than the cap 2, or the head of the cleaning liquid hits the packing 3. Therefore, a small positive pressure acts on the packing 3 which has received the cleaning liquid in the washer tank 1. However, since the packing 3 does not contact the pedestal portion 24 and is deformed toward the cap 2, no gap is formed in the cut groove 32.
Therefore, the cleaning liquid is very unlikely to leak.

The kerf 32 and the vent hole 23 are located approximately 180 degrees opposite each other with the center of the cap 2 interposed therebetween.
The ventilation path from 2 to the ventilation hole 23 through the groove 25 is maze-shaped. For this reason, even if the cleaning liquid leaks from the gap formed by slightly opening the incision 32 due to the vibration of the vehicle 81 or the like, the liquid leaking to the outside of the ventilation hole 23 hardly occurs.

Therefore, in this embodiment, the following effects can be obtained. (1) When the pressure in the washer tank 1 is negative, the packing 3 is deformed and a gap is formed in the incision 32, so that air permeability can be secured. When the cleaning liquid in the washer tank 1 is received and a positive pressure is applied to the packing 3 Is the deformation of the packing 3
4, there is no gap in the cut groove 32, so that high liquid leakage resistance can be obtained. Therefore, cap 2
And a simple lid structure made of the packing 3, it is possible to ensure high air permeability and liquid leakage resistance.

(2) When the packing 3 receives the cleaning liquid in the washer tank 1, the packing 3 is regulated by the pedestal portion 24 from both sides near the cut groove 32.
A gap can be more reliably prevented, and the liquid leakage resistance can be further enhanced.

(3) Since the ventilation path from the cut groove 32 of the packing 3 to the ventilation hole 23 of the cap 2 is maze-shaped, it is difficult for the cleaning liquid to leak to the outside of the cap 2, and the liquid leakage resistance is further improved. Can be secured.

(Second Embodiment) Next, a second embodiment will be described with reference to FIGS. As shown in FIGS. 5 to 7, the packing 3 has a one-shaped cut groove 3 as a cut portion.
3 are formed on the inner surface of the cap 2, two restricting portions 26 as restricting means are provided at positions opposed to both sides sandwiching the cut groove 33.
Are formed. The restricting portion 26 extends downward to cut the kerf 3
3, the position of the gasket 3 is regulated so that when the packing 3 is deformed, a portion near the incision 33 is not deformed.

In this embodiment, when the pressure in the washer tank 1 is negative, as shown in FIG. 8, the packing 3 is deformed toward the inside of the washer tank 1 to form a gap in the cut groove 33. Washer tank 1 through 23
Air is introduced into the inside of the washer, and the inside of the washer tank 1 is maintained at the atmospheric pressure. Conversely, when the pressure in the washer tank 1 is positive, as shown in FIG. 9, both side portions near the cut groove 33 of the packing 3 are restricted in position by the two restricting portions 26 and do not deform toward the cap 2. No gap is formed in the cut groove 33. Therefore, the cleaning liquid is very unlikely to leak.

Next, the results of a comparison test between the actual product and the comparative product will be described. As shown in FIG. 10, this graph compares the liquid leakage resistance of a product having the lid structure of the present embodiment with a comparative product corresponding to a conventional lid structure having no restricting portion 26. The horizontal axis indicates the length of the kerf, and the vertical axis indicates the pressure in the liquid leakage occurrence tank. For the actual product, one having a one-cut groove 33 in the packing 3 was prepared, and for the comparative product, two types having a one-cut groove and a cross-cut groove in the packing 3 were prepared. As shown in this graph, the product in which the regulating portion 26 for regulating the position of the packing 3 is provided has a higher pressure in the liquid leakage tank than the comparative product. That is, since it is difficult to form a gap in which the liquid leaks out in the cut groove 33, the pressure in the liquid leakage generating tank increases, and it can be seen that the liquid leakage resistance is improved in the embodiment. Also, in the embodiment, the shorter the kerf length, the higher the pressure in the liquid leakage generating tank as compared with the comparative product, and it can be seen that the liquid leakage resistance is improved. In particular, it is difficult to shorten the kerf because of its production, and it is preferable that the kerf has a length of about 5 mm. At this time, the pressure in the liquid leakage generating tank is greatly improved.

In this configuration, as well as the effects described in (1) to (3) of the first embodiment, the following effects can be obtained in addition to high air permeability and liquid leakage resistance with a simple structure. Can be (4) Since the number of extending portions extending from the inner surface of the cap 2 to form the restricting portion 26 is relatively small, the material cost can be reduced.

(Third Embodiment) As shown in FIGS. 11 and 12, a hole 34 as an opening is formed in the packing 3, and a tapered shape is formed on the inner surface of the cap 2 at a position facing the hole 34. Are formed. The convex portion 27 is inserted into the hole portion 34, and when the packing 3 is displaced upward during positive pressure, the hole portion 34 is closed at a portion where the cross-sectional diameter of the convex portion 27 is large,
The inside of the washer tank 1 is sealed. In addition, at the time of negative pressure, the packing 3 is displaced downward to form a gap between the convex portion 27 and the hole portion 34, and air permeability is secured. Note that the valve means is constituted by the convex portion 27.

In this configuration, as well as the effects described in the above items (1) to (3), the following effects can be obtained in addition to high air permeability and liquid leakage resistance with a simple structure. (5) At the time of receiving the pressure of the packing 3 (positive pressure), the hole 34 is closed, so that the liquid in the washer tank 1 can be prevented from leaking to the outside.

(Fourth Embodiment) As shown in FIG. 13, a hole 35 as an opening is formed in the packing 3, while the inner surface of the cap 2 has a diameter larger than the diameter of the hole 35. A convex portion 28 as a valve means is formed. When the upper surface of the packing 3 comes into contact with the lower surface of the convex portion 28 at the time of positive pressure, the hole 35 is closed by the convex portion 28, and the inside of the washer tank 1 is sealed. In addition, at the time of negative pressure, the packing 3 is displaced downward and the hole 35 is opened, so that air permeability is ensured. Also in this configuration, similarly to the effects described in (1) to (3) and (5), high air permeability and liquid leakage resistance can be obtained with a simple structure.

(Fifth Embodiment) As shown in FIG. 14 (b), a valve body 36 constituting a valve means is cut into the packing 3, and the valve body 36 is bent at a base to open the opening in the packing 3. 36a are formed. As shown in FIG. 14 (a), an extension portion 29 constituting valve means is formed on the inner surface of the cap 2 at a position facing the valve body 36 of the packing 3, and the ventilation hole 23 is formed in the extension portion 29. Is formed. At the time of positive pressure, the opening 36a is closed by the valve body 36 contacting the lower surface of the extension portion 29, and the inside of the washer tank 1 is sealed. In addition, at the time of negative pressure, the valve body 36 is bent downward and displaced, the opening 36a is opened, and the inside of the tank 1 is communicated with the atmosphere, so that air permeability is secured. Also in this configuration, similarly to the effects described in (1) to (3) and (5), high air permeability and liquid leakage resistance can be obtained with a simple structure.

(Sixth Embodiment) As shown in FIG. 15, the packing 3 is bent upward, and a cut groove 37 is formed in the bent portion as a straight cut portion. In the packing 3, a restricting portion 38 is formed on both sides of the cut groove 37 as a restricting means extending upward. ing. At the time of positive pressure, it is in the state shown in FIG. 15, and since the regulating portion 38 hits the upper surface of the cap 2 and no gap is formed in the cut groove 37, the liquid in the washer tank 1 is hard to leak. In addition, at the time of negative pressure, the packing 3 is deformed downward, so that a gap is formed in the cut groove 37, and air permeability is secured. Even in this configuration, the above (1) to
As with the effect described in (3), high air permeability and liquid leakage resistance can be obtained with a simple structure.

(Seventh Embodiment) As shown in FIGS. 16 and 17, a locking projection 22 as a valve means for assembling the packing 3 to the cap 2 has a function of preventing the packing 3 from coming off. A regulating portion 22a and an insertion portion 22b inserted into a locking hole 31 forming an opening formed in the packing 3.
And The insertion portion 22b is tapered so that the cross-sectional diameter decreases as it goes downward, and the locking hole 31 is closed when the packing 3 is displaced upward. Grooves 22c forming openings are formed on both sides (left and right in FIG. 17) of the upper surface of the regulating portion 22a. It is a passage that communicates with. At the time of positive pressure, the packing 3 is displaced upward, the locking hole 31 is closed, the inside of the washer tank 1 is sealed, and the pressure in the tank is maintained at a high pressure. In addition, at the time of negative pressure, the packing 3 is displaced downward, and the inside of the washer tank is communicated with the atmosphere, so that air permeability is ensured.

In this configuration, as well as the effects described in the above (1) to (3) and (5), the following effects can be obtained in addition to high air permeability and liquid leakage resistance with a simple structure. Can be.

(6) The valve means is provided on the locking projection 22 for mounting the packing 3, so that the structure of the cap 2 can be simplified. Note that the embodiment is not limited to the above, and for example, may be changed as follows.

In the first, second and sixth embodiments,
Each of the cut grooves 32, 33, and 37 may have a cut shape other than the one-letter shape and the cross shape. -In the said 2nd Embodiment, it is not restricted to two regulating parts 26 being formed in the vicinity of both sides of the cutting groove 33. For example,
It may extend annularly from the inner surface of the cap 2 to the vicinity of the incision 33.

The technical ideas other than the claims that can be grasped from the embodiment and the other examples will be described below together with their effects. (1) In claim 1 or 2, the restricting means is a restricting portion (24, 26, 3) formed on the lid or packing.
8). According to this configuration, the number of components for the ventilation structure can be reduced.

(2) In claim 1 or 2, the valve means is a valve portion (22, 27, 28) formed on the lid. According to this configuration, the number of components for the ventilation structure can be reduced.

[0045]

As described above in detail, according to the first aspect of the present invention, when the pressure in the washer tank is negative, the packing is deformed and a gap is formed in the cut portion, so that air permeability can be ensured. When the packing receives the liquid, the packing does not deform in the vicinity of the cut portion and there is no gap in the cut portion, so that the liquid leakage can be improved. Therefore, it is possible to secure high air permeability and liquid leakage resistance with a simple structure.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in the above, when the packing receives the liquid in the washer tank, the packing is regulated from both sides near the cut portion, so that it is possible to more reliably prevent a gap from being formed in the cut portion, Liquid leakage can be further enhanced.

According to the third aspect of the present invention, when the pressure in the washer tank is negative, the ventilation hole and the inside of the washer tank communicate with each other through the opening of the packing, so that air permeability can be ensured. When the pressure is received, the opening of the packing is closed, so that liquid leakage can be prevented. Therefore, it is possible to secure high air permeability and liquid leakage resistance with a simple structure.

According to the invention described in claim 4, according to claim 1
In addition to the effects of the invention described in the third aspect, since the ventilation path from the cutout or opening on the packing side to the ventilation hole on the lid side is maze-shaped, higher liquid leakage resistance can be secured. it can.

[Brief description of the drawings]

FIG. 1 is a side sectional view taken along line III-III of FIG. 2, showing a ventilation structure of a washer pump according to a first embodiment.

FIG. 2 is a plan view showing the inner surface of the cap.

FIG. 3 is a side sectional view taken along line IV-IV of FIG. 2;

FIG. 4 is a side sectional view for explaining the ventilation function of the ventilation structure.

FIG. 5 is a side sectional view taken along line VV of FIG. 6 showing a ventilation structure of a washer tank according to a second embodiment.

FIG. 6 is a plan view showing the inner surface of the cap.

FIG. 7 is a side sectional view showing the vicinity of a kerf.

FIG. 8 is a side sectional view for explaining the ventilation function of the ventilation structure.

FIG. 9 is a side cross-sectional view for explaining a liquid leakage resistance action of the ventilation structure.

FIG. 10 is a graph showing liquid leakage resistance.

FIG. 11 is a side sectional view showing a ventilation structure of a washer tank according to a third embodiment.

FIG. 12 is a side sectional view showing a valve structure.

FIG. 13 is a side sectional view showing a valve structure according to a fourth embodiment.

14A is a side sectional view showing a valve structure, and FIG. 14B is a plan view of an inner surface of a cap in the fifth embodiment.

FIG. 15 is a side sectional view showing a valve structure according to a sixth embodiment.

FIG. 16 is a side sectional view showing a ventilation structure of a washer tank according to a seventh embodiment.

17 (a) is a side sectional view of the valve structure, and FIG. 17 (b) is a sectional view taken along the line VI-VI in FIG. 17 (a).

FIG. 18 is a schematic side view of a vehicle.

FIG. 19 is a side sectional view showing a ventilation structure of a conventional washer tank.

FIG. 20 is a side sectional view showing a ventilation structure according to the related art.

[Explanation of symbols]

1 ... Washer tank, 2 ... Cap as lid, 3
... packing, 11 ... inlet part, 22 ... locking projection as valve means, 22c ... groove part forming an opening, 23 ... vent hole, 24 ... pedestal part as restriction means, 26 ... restriction part as restriction means 27, a convex portion as valve means, 28, a convex portion as valve means, 29, an extension portion as valve means, 31
... Locking holes constituting an opening, 32... A kerf as a notch, 33... A kerf as a notch, 34. A hole as an opening, 35. A hole as an opening, 36. , A cut-out portion as a cut-out portion, and a regulating portion as a regulating means.

Claims (4)

[Claims] 1. A lid (2) attached to an inlet portion (11) of a washer tank (1) and having a vent hole (23); and a lid (2) disposed inside the lid (2), Notches (32, 33, 3) through which the ventilation holes (23) of the body (2) can communicate with the interior of the washer tank (1).
And a notch (32, 33, 3) of the packing (3).
7) A ventilation structure in a washer tank, comprising a regulating means (24, 26, 38) for preventing a portion near 7) from being deformed toward the lid (2). 2. The washer according to claim 1, wherein the regulating means is provided so as to regulate the position of both sides of the packing (3) in the vicinity of the cuts (32, 33, 37). Ventilation structure of the tank. 3. A lid (2) attached to an inlet (11) of a washer tank (1) and having a ventilation hole (23); and a lid (2) disposed inside the lid (2), Openings (22c, 31, 3) through which the ventilation holes (23) of the body (2) can communicate with the inside of the washer tank (1).
4, 35, 36a), and the inside of the washer tank (1) and the vent (23) of the lid (2) are communicated with each other at the time of negative pressure in the washer tank (1). And a valve means (22, 27, 28, 29, 36) for opening and closing the opening so as not to communicate with the washer tank (1) at the time of positive pressure. Ventilation structure. 4. The lid (2) and the packing (3)
Are provided with the ventilation holes (23) and the cut portions (32, 3).
3, 37) or the opening (22c, 31, 34, 3)
The washer according to any one of claims 1 to 3, wherein the washers (5, 36a) are arranged on opposite sides of the center of the lid (2). Ventilation structure of the tank.