JPH0355710B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a two-way valve mainly used for controlling the internal pressure of fuel tanks of vehicles such as automobiles and for so-called "full tank regulation". It is connected between the tank and the air cleaner and is used for specifications such as adjusting the internal pressure of the fuel tank and regulating fuel evaporation.

(Prior Art) There are many conventional two-way valves used for the above-mentioned purposes, and their structures vary.

Particularly in valves that use springs to control opening and closing in two directions, the structure of the valve itself is complex, the number of parts is large, and there is a lot of waste in product specification management, cost management, etc.

As a two-way valve with the least number of parts, the umbrella shape and slit valve are integrally molded from an elastic material such as rubber.
There is an example of using a so-called combination valve (hereinafter referred to as a combination valve). Hereinafter, an example of this will be explained using the drawings. In Fig. 4, the casing 5
0 has a cylindrical shape and is partitioned near the center by a partition plate 51. 52 is a combination valve, which includes a cylindrical portion 53 and an umbrella-shaped valve portion 5.
4. The slit valve portion 55 is integrally molded from a rubber material. The cylindrical portion 53 has a groove 53a for attaching to the partition plate 51. The partition plate 51 has a hole 51a for attaching the combination valve 52, and the combination valve 52 is fixed to the casing 50 by engaging with the attachment groove 53a. Furthermore, the partition plate 51 has a passage 51b, which is opened and closed by the umbrella-shaped valve portion 54. 56 and 57 are lid portions having ports 58 and 59, respectively. The structure has been explained above, but to explain its operation, the umbrella-shaped valve portion 5
4 blocks the passage 51b and the slit valve portion 55 is opened, so that the fluid enters from the port 58 and moves in the direction of exiting from the port 59. Next, the slit valve part 55 blocks and closes the flow pressure from the direction of the port 59, and the umbrella-shaped valve part 54 separates from the partition plate 51 surface.
Since the port 51b is opened, the fluid enters from the port 59 and moves in the direction of exiting from the port 58.

(Problems to be Solved by the Invention) Although the conventional structure has been described above, there is a major problem here. In other words, when installing a combination valve, it is essential to have a mounting groove in the cylindrical part on the valve side and a partition plate on the casing side. For valves, when molding rubber materials, etc., the need to create narrow grooves means that the mold must be made into a complex shape.
This will have an impact on cost and dimensional quality.

Also, providing a partition plate on the casing means that
During molding, the mold is released centering on the partition plate, which not only limits the method of molding the casing, but also requires that the lid be molded separately, and the number of parts varies between the casing and the lid. A minimum of 3 pieces are required for each department. The present invention solves the above-mentioned drawbacks, fixes a combination valve between a casing and a lid, and aims to achieve certain objectives.

(Means for Solving the Problems) The following features include: a cylindrical casing having an open opening; a lid having an opening and connected to the casing; and either the casing or the lid. A cylindrical convex portion communicating with the opening is provided on either side, and the convex portion is made of an elastic material and has a cylindrical shape with a slit valve at the end, and an umbrella-shaped valve around the cylindrical convex portion. The other end cylindrical part of the slit valve part of the combination valve is engaged, the facing part of the convex part serves as the valve seat of the umbrella valve, the combination valve is held between the casing and the lid part, and the convex part , where a passage is provided that communicates between the opening and the inside of the casing.

(Example) The present invention will be described below with reference to the drawings. FIG. 1 shows one embodiment of the present invention, in which numeral 3 denotes a cylindrical casing, which has an opening 1 at its bottom 3a. 7 is a lid portion of the casing 3, which includes an opening 2 and an opening 2;
a convex portion 4 communicating with the casing 3 and projecting into the casing 3;
has. The convex portion 4 has a small hole 5 that opens into the casing 3. An end portion of a combination valve 6 formed of an elastic material is engaged and fixed to the convex portion. The combination valve 6 has a slit valve part 6b in the center that opens with the pressure of the opening port 2 and shuts off with the pressure of the opening port 1, and a slit valve part 6b that opens with the pressure of the opening port 1 and uses the bottom 3a of the casing 3 as a valve seat. It has an umbrella-shaped valve portion 6a that is closed and closed by the pressure of the opening port 2. The periphery of the lid portion 7 is fitted and fixed to the end portion of the casing 3, so that the combination valve is held therebetween. A is the internal space of the casing 3. The structure of the present invention has been described above, and the operation will be explained below.The opening 1 is connected to the fuel tank of an automobile, and the opening 2 is connected to an air cleaner.

When evaporative gas is generated in the fuel tank and the pressure in the fuel tank increases, the pressure opens the umbrella-shaped valve portion 6a of the combination valve 6 from the opening port 1, passes through the space A, and passes through the small hole 5. Evaporative gas is discharged from the opening 2 into the air cleaner to maintain constant pressure inside the fuel tank. Next, the fuel in the fuel tank is consumed,
When the internal pressure of the fuel tank decreases, the slit valve part 6b of the combination valve 6 is opened, and atmospheric air is conducted from the air cleaner to the fuel tank through the opening port 2, the slit valve part 6b, and the opening port 1 to maintain a constant pressure. be.

FIGS. 2 and 3 show another embodiment, in which the casing 21 is resin-molded into a cup shape and has an opening 22 at the center bottom. The opening 2
2 is extended to form a convex portion 27 inside the casing 21. The convex portion 27 has two stages, and as shown in FIG. 3, a communication groove 23 is cut in the convex portion 27, which communicates the inner space 21 of the casing 21 with the opening 22.
A cylindrical portion 24a of the combination valve 24 formed of an elastic material is fixed to the narrow diameter stepped portion 27a of the convex portion 27.
The combination valve 24 has an umbrella-shaped valve part 24b on the outer periphery of the cylindrical part 24a, and a slit valve part 24c at one end of the cylindrical part 24a. 25 is the lid part,
It has an open opening 26 near its center. Lid part 2
5 has a cylindrical space from the opening 26 and a ring-shaped protrusion 25a along the inner surface of the cup-shaped casing 21. The ring-shaped protrusion 25a
The umbrella-shaped valve portion 24b of the combination valve 24 comes into contact with the surface and serves as its valve seat. The slit valve seat 24c projects into the cylindrical space. Casing 2
1 and the lid 25 are fixedly sealed at their ends, so that the combined valve is sandwiched between the casing 21 and the lid 25.

The structure has been explained above, and its operation will be explained. The opening port 26 is connected to the fuel tank, the opening port 22 is connected to the air cleaner, and the umbrella-shaped valve part 24b is opened to release the high pressure evaporative gas generated in the fuel tank. When the pressure inside the fuel tank becomes low, the slit valve portion 24a is opened and atmospheric air is introduced from the air cleaner to maintain a constant pressure inside the fuel tank.

(Effects of the Invention) The embodiments of the present invention have been described above, and the product of the present invention has a very simple structure, consisting of three parts: a casing, a lid, and a valve. The moldability of the casing is also very good because the casing does not require a mounting plate, which is common when attaching a combined two-way valve. Furthermore, since a coil spring is not used in the valve portion, there is no flow resistance and the valve can respond smoothly. Further, since the combination valve does not need to be tightly engaged with the convex portion, the umbrella valve will not be deformed and the function of the umbrella valve will not be adversely affected.

[Brief explanation of drawings]

FIGS. 1 and 2 are sectional views showing an embodiment of the present invention, and FIG. 3 is an AA sectional view of an embodiment of the present invention.
FIG. 4 is a sectional view of a conventional example. 3, 21...Casing, 1, 2, 22, 26
...Open opening, 4,27...Protrusion, 5...Small hole, 2
3... Conduit, 6, 24... Combination valve, 6a, 24
b... Umbrella-shaped valve seat, 6b, 24c... Slit valve portion, 3a, 25a... Valve seat.

Claims (1)

[Claims] 1. A cylindrical casing having an opening, a lid having an opening and connected to the casing, and a cylindrical protrusion communicating with the opening on either the casing or the lid. the other end of the slit valve part of the combination valve, which is cylindrical and has a slit valve at the end and an umbrella-shaped valve around it, is engaged with the convex part by an elastic body; The facing portion of the convex portion is a valve seat of an umbrella-shaped valve, the combination valve is held between the casing and the lid portion, and the convex portion is provided with a passage communicating between the opening and the inside of the casing. Two-way valve.