JPS6039479Y2 - rollover valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present application relates to a rollover valve used in a fuel system of an internal combustion engine.

The rollover pulp is disposed in a flow path between a fuel reservoir and a carbon canister provided to adsorb and hold evaporated fuel from the fuel reservoir, and when the vehicle body is tilted at an angle exceeding a certain value, the flow path is closed. It has a closing function.

Conventional rollover pulp
As shown in Publication No. 7, a ball body is disposed between upper and lower casings having a communicating pipe, a hemispherical valve body having a protrusion is placed on the ball body, and the protrusion and the upper casing are placed on top of the ball body. A valve is formed between the valve and the opening provided in the communication pipe.

This valve has the feature that it does not use spring means and responds accurately to the inclination of the vehicle body.
On the other hand, it brings about the following drawbacks.

That is, when the vehicle body tilts over a certain angle, the valve closes to cut off the flow of fuel, but when the vehicle body returns to its normal position, the valve body does not return to its original position and the valve remains closed.

This is because the fuel tank is sealed and the evaporated fuel presses the valve body.

The present application provides a rollover pulp that eliminates the above drawbacks.

To explain with reference to the drawings, FIG. 1 shows a rollover pulp 10 of the present invention, in which a ball body 6 and a valve body are arranged in a chamber 5 formed by upper and lower casings 3 and 4 having a communicating pipe 1.2. Destroy.

A communicating pipe 1 is provided horizontally at the upper end of the upper casing 3.

The lower casing 4 has a mortar-shaped bottom wall 8 and an annular flange portion 9 at the upper open end.

A plurality of radially extending flow grooves 11 are formed in the flange portion 9 .

The valve body 7 is made of plastic and has a protrusion 14 in the center, and an umbrella-shaped body 12 is integrally provided with the protrusion, and a metal plate 13 is embedded in the umbrella-shaped body 12.

The outer diameter of the umbrella-shaped body 12 is set to a smaller value than the inner diameter of the open end of the upper casing 3.

An opening 16 is provided in the side wall 15 of the communication pipe 1 facing into the chamber 5, and a valve is formed between the opening and the protrusion 14 of the valve body 7 arranged in the chamber 5.

The opening 16 is open when the valve body 7 is placed on the flange portion 9 of the lower casing 4.

As shown in FIG. 2, the valve body 7 has an umbrella-shaped metal body 12a.
It may be formed with a plastic protrusion 14a, or it may be formed with an umbrella-shaped plastic body and a metal protrusion.

The rollover valve 10 is used with the communication pipe 1 connected to a carbon canister (not shown) that holds evaporated fuel, and the communication pipe 2 connected to a fuel tank (not shown).

In FIG. 1, evaporated fuel generated from the fuel tank passes through the communication pipe 2 into the chamber 5, and from there passes through the communication groove 11 of the flange portion 9 of the lower casing 4, the opening 16 of the upper casing 3, and exits from the communication pipe 1. Furthermore, it flows into the carbon canister.

When the vehicle body tilts, the ball inside the chamber 5 moves and pushes the valve body 7 in contact with it upward, and the protrusion 14 opens into the opening 16.
occlude.

Therefore, even if fuel from the fuel tank flows into the chamber 5, it does not reach the carbon canister.

When the vehicle body falls over, the valve body 7 is pressed by the weight of the ball body 8 and closes the opening 19 as described above to prevent fuel from flowing out.

When the vehicle body is tilted and the opening 16 is closed, the interior of the chamber 5 is pressurized by the evaporated fuel, but when the vehicle body is returned to its normal position, the valve body 7 having the metal plate 13 descends under its own weight and closes the opening 16. to open.

In the case of FIG. 3, at the same time as the vehicle body returns to its normal position, the pressing state of the ball body 6 against the valve body 7a is released and the opening 16 is opened by the spring 17.

As described above, the rollover pulp of the present invention not only responds only to the posture of the vehicle body and provides accurate opening and closing characteristics, but also has a valve body with a metal body that is particularly important even when pressure from evaporated fuel acts inside the valve after the valve is closed. This allows the valve to be opened promptly when the vehicle body is returned to its normal position.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the rollover valve of the present invention, and FIG. 2 is a sectional view of the valve body. 1.2... Communication pipe, 3, 4... Upper and lower casing, 6... Ball body, 7... Valve body, 13...・Metal plate, 14...
・Protrusion, 16...opening, 11...flow groove.

Claims (1)

[Scope of utility model registration request] An upper casing having a horizontal communication pipe at the upper end and an opening in the communication pipe, an annular flange provided above, a plurality of flow grooves extending radially in the flange, and a mortar-shaped bottom wall below. and a lower casing with a communicating pipe between them, a plastic valve body having a protrusion in the center, an umbrella-shaped body provided in the protrusion, and a built-in metal; A ball body is provided, the ball body is positioned on the bottom wall, a valve body is placed on the ball body, the lower end of the umbrella-shaped body of the valve body is placed on the annular flange, and the opening and the valve body are placed on the ball body. A rollover valve for an internal combustion engine that is formed by forming a valve with a protrusion of a valve body.