JPH0343407Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a fuel outflow prevention valve disposed in an emission passage or the like to prevent an increase in the internal pressure of a fuel tank of an automobile.

(Prior art) This type of valve has an operating ball that moves when the vehicle body is reversed or rolled over, thereby moving the float valve to the closed position and preventing fuel from flowing out. , for example, Utility Model Application Publication No. 53-3323, Utility Model Application Publication
No. 57-30369, Japanese Utility Model Application No. 58-116414, and Japanese Utility Model Application No. 60-159879 propose a valve box in which the inner bottom surface of the valve box on which the moving ball rolls is provided with a tapered recess. .

Further, as shown in Fig. 5, Japanese Utility Model Publication No. 15980 discloses a valve box c that is provided with a valve hole b that communicates with the outside and communicates with the inside of the fuel tank a, and a A float valve d that moves to open and close the valve hole b, a lower surface e of the float valve d, and a bottom surface f of the valve box c.
In order to convert the movement of the actuating ball g into the closing movement of the float valve d when the vehicle body is tilted by a predetermined angle or more, the bottom surface f of the valve box c is A concave curved surface has been proposed.

According to this conventional example, when the vehicle body is reversed, as shown in FIG. 6, the weight of the float valve d and the operating ball g closes the valve hole b to prevent fuel from flowing out.

Also, when the vehicle rolls over, as the operating ball g falls between the float valve d and the valve box c under its own weight, the operating ball g is guided by the bottom surface f of the valve box c and closes the float valve d. Push into position to prevent fuel from leaking.

(Problem that the invention aims to solve) However, this type of fuel leakage to the outside is not limited to when the vehicle body is tilted at a predetermined angle or more during inversion or rollover, but also when the vehicle makes a sharp turn and the vehicle body is exposed to large amounts of damage. This also occurs when lateral G is applied.

At this time, in the above conventional example, as shown in FIG. 7, it is not only necessary for the actuating ball g to overcome the load of the float valve d, but also to overcome the gravity of the actuating ball g's own weight so that the valve body c Since it is necessary to move the bottom surface f upward, there is a problem in that the reaction movement of the actuating ball g to the lateral G is slow and it is not possible to effectively prevent the outflow of fuel.

(Means for Solving the Problems) In order to solve the above problems, the present invention has a valve box that is provided with a valve hole that communicates with the outside and communicates with the inside of the fuel tank, and a valve box that moves up and down within the valve box. In a fuel outflow prevention valve having a float valve that opens and closes the valve hole, and a movable operating ball disposed between the lower surface of the float valve and the bottom surface of the valve box, the lower surface of the float valve is located at the center of the valve. The valve body is characterized by being recessed so that the valve body is maximally recessed and both sides thereof are sloped surfaces, and the bottom surface of the valve body is formed into a flat shape.

(Function) According to the above configuration, since the bottom surface of the valve box is formed in a planar shape, when the operating ball moves on the bottom surface in response to lateral G, the influence of its own weight can be removed. The lateral movement of the actuation ball is converted into the closing movement of the float valve by the inclined surface formed on the lower surface of the float valve, but the movement of the actuation ball at this time is only due to the load on the float valve. Since it is only necessary to overcome the problem, it is smoother and faster than the conventional example.

Therefore, when the lateral G acts, the moving ball
Since the float valve can be moved to close the float valve, it is possible to effectively prevent fuel from flowing out due to lateral G.

(Embodiment) FIGS. 1 to 4 show an embodiment in which the present invention is applied to a fuel outflow prevention valve disposed in an emission passage.

A valve box 2 is attached to the upper wall opening of a fuel tank 1 via a packing 3. A valve hole 5 is provided in the center of the cap portion 4 of the valve box 2. A conduit 20 connected to this valve hole 5 guides air and evaporated fuel inside the fuel tank 1 to a canister (not shown).
It also communicates with the outside via this canister.

A float valve 6 is disposed within the valve box 2 so as to be vertically movable. A convex portion 7 for opening and closing the valve hole 5 is formed on the upper part of the float valve 6. The lower surface 8 of the float valve 6 has a central portion 9 that is most concave, and left and right side portions 10 of the lower surface 8 that are tapered. This float valve 6 is guided to the inner surface of the valve box 2 and is located between a valve closing position where the protrusion 7 closes the valve hole 5 and a position where the protrusion 7 opens the valve hole 5. Move up and down.

The bottom surface 11 of the valve box 2 is formed into a planar shape, and an operating ball 12 is disposed between the bottom surface 11 and the lower surface 8 of the float valve 6. Further, a through hole 13 is formed in the bottom wall and side wall of the valve box 2, and the internal space of the valve box 2 is opened to the inside of the fuel tank 1.

In the above configuration, under normal conditions, the float valve 6 is in the open position as shown in FIG.
The inside and outside of the fuel tank 1 are in communication.

When the automobile makes a sharp turn and a large lateral force is applied, the operating ball 12 rolls on the bottom surface 11 of the valve box 2 in the direction of arrow P in response to the lateral force, as shown in FIG. At this time, the operating ball 12 can push the tapered inclined surface of the lower side 10 of the float valve 6 in the direction of the arrow U and move the float valve 6 to the closed position. , it is possible to effectively prevent fuel from flowing out due to lateral G.

When the vehicle body is reversed, as shown in FIG.
can be pushed down to the valve closing position to close the valve hole 5. Although not shown, when the vehicle rolls over, the moving ball 12 moves downward under its own weight between the float valve 5 and the valve box 2 and hits the tapered inclined surface of the lower side 10 of the float valve 5. The valve hole 4 can be closed by touching and pushing in the valve closing direction.

When the liquid level of the fuel rises, as shown in FIG. 4, the float valve 6 moves upward to the closed position due to buoyancy, and the convex portion 7 closes the valve hole 5 to prevent the fuel from flowing out.

The present invention can be configured in various ways other than those shown in the above embodiments. For example, in the above embodiment, both sides of the lower surface of the float valve are recessed into a tapered inclined surface, but the lower surface of the float valve can be recessed into a quadratic curved surface or a spherical surface.

(Effect of the invention) Since the present invention has the above-mentioned structure and operation, the closing operation of the float valve can be maintained not only when the vehicle body is reversed or rolled over, but also when receiving a large lateral force such as when making a sharp turn. As a result of being able to do this smoothly and quickly, it is possible to effectively prevent the fuel from flowing out due to the lateral G.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention,
Figure 1 is a vertical front view in normal conditions, Figure 2 is a vertical front view when subjected to lateral G, Figure 3 is a vertical front view when inverted, Figure 4 is a vertical front view when the liquid level is rising, Figures 5 to 7 show conventional examples, with Figure 5 being a vertical sectional front view in normal conditions, Figure 6 being a vertical sectional front view in inversion, and Figure 7 being a vertical sectional front view in reverse.
The figure is a longitudinal sectional front view when receiving lateral G. 1...Fuel tank, 2...Valve box, 5...Valve hole,
6...Float valve, 8...Bottom surface, 9...Center part,
10...side part, 11...bottom surface, 12...operating ball.

Claims (1)

[Scope of utility model registration request] A valve box having a valve hole communicating with the outside and communicating with the inside of the fuel tank, a float valve that moves up and down within the valve box to open and close the valve hole, and a bottom surface of the float valve and a bottom surface of the valve box. In a fuel outflow prevention valve having a movable actuating ball disposed between the float valves, the lower surface of the float valve is recessed so that the center portion thereof is maximally concave and both sides thereof are sloped surfaces, and A fuel outflow prevention valve characterized by a flat bottom surface of the valve box.