JPS5911233Y2 - valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a valve used in an ignition timing adjustment device of an internal combustion engine installed to purify vehicle exhaust gas, and more specifically, provides a valve that can be operated by a minute differential pressure. It is something.

Conventionally, as illustrated in FIG. 1, a certain valve is made from a mounting part 1 and a flexible part 2 which is made of a rubber-like elastic material and extends outward from one end of the mounting part 1 to have a substantially umbrella shape.
Alternatively, as illustrated in FIG. 2, the mounting portion 1, the flexible portion 2 extending outward from the mounting portion 1 in a flat plate shape, and the annular sealing piece 3 protruding in the axial direction from the outer end of the flexible portion 2. As shown in the drawings, the valve is attached to a valve plate 6 having a communication hole 7 with a flexible part 2 (Fig. 1) or a flexible part 2 and a sealing piece 3 (Fig. 2) covering the communication hole 7. The pressure of the fluid on the flow hole 7 side (up and down in the figure) is on the opposite side of the valve,
When the pressure of the fluid becomes considerably higher than the pressure of the fluid at the upper part of the figure, the lower fluid flows through the flow JL7, and when the contrast between the fluid pressures on both sides is the opposite of the above, the fluid For example, a valve device designed to stop the flow was developed in 1983-6.
It is widely known in Japanese Patent No. 5921 and the like.

In a valve device using a valve with the above structure,
In order for the flexible part 2 of the valve to exhibit elastic resistance against bending deformation during the valve opening operation, the valve is opened until the pressure difference between the fluids in the two cavities that sandwich the valve reaches a considerable value. I can't see it working.

On the other hand, in the valve used in the ignition timing adjustment device, when a minute pressure difference occurs between the fluids in the two chambers sandwiching the valve, a valve-opening force is applied to the valve by the minute pressure difference. Therefore, it is desired to obtain a valve opening characteristic that enables immediate valve opening operation.

However, if an additional structure that applies a valve-opening assisting force is inserted into the valve body, the structure of the entire valve becomes complicated, which is not preferable.

For this reason, it is desirable to apply a valve-opening assisting force without adding any new additions.

The technical problem of the present invention is to provide a flexible portion shape that generates a force that promotes displacement in the opening direction.

As a technical means to solve this technical problem, the inventor
An arcuate curved portion is formed on the flexible portion toward the side from which the sealing piece protrudes.

Among the fluids present on both sides of the flexible part, when the pressure of the fluid on the outside of the bulge, that is, on the valve plate side, increases slightly compared to the pressure of the fluid on the opposite side, the curved part of the flexible part Since the area of the outer circumferential surface is larger than the area of the inner circumferential surface, a bending moment acts that separates the sealing piece from the valve plate using the curved portion as a fulcrum.

Therefore, the sealing piece can be separated from the valve plate by an extremely small pressure difference.

The valve according to the present invention has the following unique effects by being equipped with the above-mentioned means.

The same effect as the above is produced by providing a ■-shaped part in the flexible part that bulges toward the side from which the sealing piece protrudes, and the above technical problem is solved, but bending stress is generated at the bottom of the ■-shaped part. It is concentrated and has poor durability.

On the other hand, in the present invention, since the curved part is in a circular arc shape,
Bending is performed over the entire curved part, and stress is not concentrated in one part.

Therefore, the present invention is superior in durability compared to the one provided with the ■-shaped portion.

Embodiments of the valve according to the present invention will be described below with reference to the drawings.

In the embodiment shown in FIG. 3, a flexible portion 2 extends outward from a substantially columnar mounting portion 1 located at the center and has an annular sealing piece 3 attached to the outer end thereof, and the sealing piece 3 protrudes from the flexible portion 2. A valve plate 6 is provided with an annular curved portion 9 that swells in the direction, and has a communication hole 7 bored therein.
The flexible part 2 covers the communication hole 7 and is attached without the need for opening and closing the communication hole 7 by means of a sealing piece 3 that is in contact with and away from the surface of the valve plate 6. In the embodiment shown in FIG. The curved portion 9 attached to the portion 2 is different from the embodiment shown in FIG. 3 in that it has two strips, and in the embodiment shown in FIG. An annular curved portion 9 that bulges toward the sealing piece 3 is attached to the middle of the flexible portion 2, which has an annular sealing piece 3 attached thereto.

[Brief explanation of drawings]

1 and 2 are cross-sectional views showing examples of valve devices using valves according to the prior art, and FIGS. 3, 4, and 5 are examples of valve devices using valves according to the present invention, respectively. FIG. DESCRIPTION OF SYMBOLS 1... Mounting part, 2... Flexible part, 3... Sealing piece, 6
... Valve plate, 7... Distribution hole, 9... Curved part.

Claims (1)

[Scope of utility model registration request] A mounting part 1 , a flexible part 2 extending radially from the mounting part 1 , and an annular sealing piece 3 projecting in the axial direction from an end of the flexible part 2 , wherein the flexible part 2 is connected to the sealing piece 3 . A valve characterized by having an arc-shaped curved portion 9 that swells toward the projecting side.