JP2546620Y2 - Reservoir tank cap - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap used for a reservoir tank containing radiator fluid, power steering oil, clutch fluid or brake fluid.

[0002]

2. Description of the Related Art Conventionally, a cap of this type generally comprises a cap body 2 and an inner cap 3, as shown in FIG. A vent hole 5 is provided for communicating a space 4 defined by the inner cap 2 and the inner cap 3 to the outside, and a communication hole 6 for communicating the inside of the tank 7 with the space 4 is provided at a central portion of the inner cap 3. ing.

In the cap 1, since the communication hole 6 is arranged near the liquid surface, when the liquid in the tank 7 fluctuates, the liquid easily enters the space 4 through the communication hole 6, and the cap 1 There has been a problem that the gas leaks to the outside through the ventilation holes 5 provided in the main body 2.

In order to solve such a problem, for example, Japanese Utility Model Publication No. 50-23732 discloses a communication hole 6 formed in an inner cap 3 between a central portion A and an outer peripheral portion B of the inner cap 3 as shown in FIG. Provided on the circumference and downwardly protruding shielding plates 8 and 9 are respectively provided between the communication hole 6 and the central portion A and the outer peripheral portion B, so that the liquid in the tank 7 leaks into the space 4 from the communication hole 6. Trying to prevent that.

[0005]

However, according to the cap structure disclosed in Japanese Utility Model Publication No. 50-23732, the communication hole is still located near the liquid level in the tank, so that the reservoir tank is inclined. It was difficult to completely prevent the liquid from leaking from the communication hole. In addition, since the ventilation hole 5 is provided on the top surface of the cap body 2, there is a problem that external foreign matter easily enters the space 4 from the ventilation hole 5 and further enters the liquid in the tank 7 through the communication hole 6. Had also occurred. The purpose of the present invention is to solve the above-mentioned problem, and even when the reservoir tank is tilted or swung, the liquid in the tank does not leak and no foreign matter enters from outside. It is to provide a reservoir tank cap.

[0006]

Means for Solving the Problems To solve the above problems,
For this purpose, the present invention provides a cap body and the inside of the cap body.
Reservoir tank consisting of an inner cap provided in
Fitting into the reservoir tank opening
The open end of a substantially bottomed cylindrical inner cap
Face the bottom of the body with a slight gap
Forming a space in the cap, the bottom in the inner cap
In the center of the part, the inside of the reservoir tank and the space are communicated.
An upright hollow cylinder is set up, and the upper end of the hollow cylinder is
Facing the bottom of the cap body with a slight gap,
Near the upper end portion of the hollow cylinder portion inside the cylinder, the reservoir tank
Plate having a communication hole for communicating the inside of the space with the space
And the cap body and the inner cap are further provided.
The space facing the outside is projected by alternately protruding
It is characterized in that a maze-shaped ventilation passage is formed.

[0007]

[Action] By such a configuration, the reservoir tank is considerably inclined or swing even liquid was upset, communicating holes are erected on the inner cap central hollow
The liquid is suppressed at the bottom of the inner cap or the lower part of the hollow cylindrical part, and the possibility of reaching the upper part of the cylindrical body is extremely high because the liquid is formed at the bottom of the inner cap or the lower part of the hollow cylindrical part. It is small and hardly leaks from the communication hole of the closing plate. Even if liquid leaks from the communication hole , a slight gap between the bottom of the cap body and the upper end of the hollow cylinder
Possibility to reach the space inside the inner cap through a narrow gap
Is sufficiently low.Furthermore, without providing a vent hole at the bottom of the cap body,
Project from each other to communicate the space inside the inner cap to the outside
Since a maze-shaped ventilation path is provided, it does not leak to the outside. For the same reason, it is possible to prevent foreign matter from entering the tank from outside.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, reference numeral 11 denotes a reservoir tank body for storing a liquid W, and an opening 12 is formed in an upper portion thereof. A cylindrical portion 13 is provided upright at the opening 12, and an upper end portion of the cylindrical portion 13 is a fitting portion 15 whose diameter is enlarged for coupling the cap 14. The cap 14 is generally constituted by a cap body 16 and a substantially bottomed cylindrical inner cap 17 welded to a lower portion of the cap body 16. The cap main body 16 includes an outer peripheral wall 19 and an inner peripheral wall 20 that concentrically hang down from the bottom 18 and a shorter intermediate wall 21 between the outer peripheral wall 19 and the inner peripheral wall 20.

The inner cap 17 is fitted to the cylindrical portion 13 of the reservoir tank body 11 with the bottom 22 facing downward. An intermediate portion of the outer peripheral wall 23 of the inner cap 17 is provided with a radially extending flange portion 24. The flange portion 24 is equally arranged in the circumferential direction, and a fitting portion of the reservoir tank body 11 is provided. 15 are provided with a plurality of engagement pieces 25. Furthermore, this inner cap 17
Has an inner / outer double cylindrical structure, and its outer cylindrical portion 2
3 a is fitted into the bottom of the cap body 16, while the opening of the inner cylindrical portion 23 b is
A slight gap 26 is formed between the cap body 16 and the bottom 18 . Further, a vent hole 27 communicating the inside and outside of the outer cylindrical portion 23a is formed at the tip of the outer cylindrical portion 23a. In this way, the cap body 16 and the inner
By alternately protruding the facing portion with the cap 17,
The space S formed by the cap body 16 and the inner cap 17 and the outside of the reservoir tank body 11 are communicated with each other by a so-called maze-shaped ventilation path 28.

At the center of the bottom portion 22 of the inner cap 17, a hollow cylindrical portion 31 is erected, and a slight gap 3 is formed between the upper end portion of the hollow cylindrical portion 31 and the bottom portion 18 of the cap body 16.
2 are provided. Then, on the inside of the hollow cylindrical body 31
A conical closing plate portion 33 having a vertex is attached near the end , that is, at a position closer to the bottom portion 18 of the cap body 16 than the liquid level, and the space S and the tank interior T are provided at the vertex of the closing plate portion 33. A communication hole 34 for communication is formed. In addition, the reason why the closing plate portion 33 has a conical shape with the vertex downward is as follows.
This is because even if the liquid passes through the communication hole 34 and reaches the upper portion of the hollow cylindrical body portion 31, the liquid can easily return to the inside of the tank again quickly.

Next, the operation of the embodiment constructed as described above will be described.

When the reservoir tank is tilted or rocked for some reason, the liquid W in the tank also rocks. As a result, most of the liquid W is transferred to the upper surface of the tank 11, the bottom 22 of the inner cap 17, and the hollow cylindrical body 31. May fall into the tank at the lower end of the
4 However, the communication hole 34 is provided in the hollow cylindrical body 3 provided in the center of the tank 11.
Cap body 1 inside of 1 and separated from normal liquid level
6, the liquid is very unlikely to reach the communication hole 34 of the closing plate 33 even if the tank is considerably inclined, so that leakage from the communication hole 34 is prevented. Can be. Also, even if the liquid passes through the communication hole 34, the possibility that the liquid leaks into the space S through the gap 32 between the bottom 18 of the cap body 16 and the upper end of the hollow cylindrical body 31 is sufficiently low. , Vent hole 27
Is not provided on the bottom portion 18 of the cap body 16 as in the prior art, but is provided in the maze-shaped ventilation path 28, so that leakage of the liquid to the outside can be prevented. or,
For the same reason, it is possible to prevent foreign matter from entering the tank from outside.

In this embodiment, an engaging piece 25 for engaging with the fitting portion 15 of the reservoir tank body 11 is provided on the flange portion 24 of the inner cap 17. It is also possible to extend the wall 19 downward, further provide a plurality of engaging pieces 25 integrally therewith, form a ventilation hole at an appropriate position on the outer peripheral wall, and communicate the maze-shaped ventilation path 28 with the outside of the tank. Good.

[0015]

[Effect of the Invention] As is clear from the above description, by adopting the reservoir tank cap of the present invention, even when the reservoir tank is tilted or swung and the liquid in the tank fluctuates, It is possible to prevent the liquid in the tank from leaking to the outside and to prevent foreign matter from entering the tank from outside.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a reservoir tank cap according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a first conventional example.

FIG. 3 is a sectional view showing a second conventional example.

[Explanation of symbols]

 14 Cap 16 Cap body 17 Inner cap 22 Bottom part 19 Outer peripheral wall of cap body 20 Inner peripheral wall of cap body 21 Intermediate wall 23 Outer peripheral wall of inner cap 23a Outer cylinder part 23b Inner cylinder part 27 Vent hole 28 Air passage 31 Hollow cylinder part 33 Closure plate part 34 Communication hole S space

Claims (1)

(57) [Scope of request for utility model registration] 1. A reservoir tank cap comprising a cap main body and an inner cap provided inside the cap main body, which is fitted into an opening of the reservoir tank.
The open end of the substantially bottomed cylindrical inner cap is the cap body
Face the bottom of the
Forming a space in the cap and a bottom portion in the inner cap
At the center, the inside of the reservoir tank communicates with the space
A hollow cylindrical body part is erected, and the upper end of the hollow cylindrical body part is
Facing the bottom of the cap body with a slight gap,
Near the upper end of the hollow cylindrical body, the reservoir tank
A closing plate portion having a communication hole for communicating the inside with the space.
The cap body and the inner cap.
The space facing the outside is made to protrude alternately with the
A reservoir tank cap, wherein a maze-shaped ventilation path is formed .