JPH088294Y2 - Fuel passage cutoff valve when the vehicle rolls over - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention prevents the fuel in the fuel tank from flowing out by opening the float valve in the carburetor float chamber when the vehicle rolls over. The present invention relates to a fuel passage cutoff valve that is arranged in a fuel passage that connects a floating chamber and a discharge port of a fuel pump when the vehicle rolls over.

[Prior Art] FIG. 8 shows a fuel cutoff valve disclosed in Japanese Patent Application No. 58-122625, which is arranged in an air breather passage of a fuel tank, and a symbol a is a valve chamber and a fuel vapor or air inlet b is Open,
A valve seat e is formed which accommodates the valve body c and is seated by the spring d when the vehicle rolls over. f is a weight, which is housed in a cylindrical weight chamber g, and when the vehicle is in a normal posture, pushes down the valve element c through an impact rod h to move the valve seat e.
Is separated from and the passage i connecting the valve chamber a and the weight chamber g is made conductive. j is an outlet opening to the weight chamber g.

FIG. 9 is a fuel cutoff valve for a vehicle rollover disclosed in Japanese Utility Model Laid-Open No. 1-71167, which is also arranged in the air breather passage of the fuel tank. Each symbol from a to h and j are the same as those in FIG. As shown in the contents, the outlet port j is opened to the valve chamber, and k is a through hole of the striking rod h and does not form a passage that connects the valve chamber a and the weight chamber g. When the vehicle rolls over, the weight f separates from the striking rod h, and the valve element c moves the inlet b and the outlet j by the bias of the spring d.
Cut off between and.

The fuel cutoff valve at the time of vehicle rollover shown in FIG. 8 is arranged in the fuel passage connecting the fuel pump and the carburetor floating chamber and is also used as a fuel passage cutoff valve at the time of vehicle rollover. In the case where b is opened in the valve chamber a and the fuel outlet is opened in the weight chamber g, the fuel inlet is in the weight chamber g and the fuel outlet is in the valve chamber a.
There is something opened to.

[Problems to be Solved by the Invention] Since a fuel vapor separation tank is used in the fuel passage between the fuel pump and the carburetor floating chamber, when a fuel passage cutoff valve for rolling over the vehicle is also arranged, If the weight chamber of the fuel passage shutoff valve is also used as the fuel vapor separation tank, the arrangement of vehicle accessory parts can be simplified.

Therefore, it is an object of the present invention to obtain a fuel passage cutoff valve for a vehicle overturning in which the weight chamber of the fuel passage cutoff valve is also used as a fuel vapor separation tank.

[Means for Solving the Problems] A fuel passage cutoff which is arranged in a fuel passage connecting a carburetor float chamber and a fuel pump discharge port to prevent fuel from flowing out of the carburetor float chamber when the vehicle rolls over. A valve chamber in which a fuel outlet communicating with the carburetor float chamber is opened, a valve body is housed, and the valve body is seated by a spring bias when the vehicle rolls over; , A weight that is located above the valve chamber and separates the valve body from the valve seat against the bias of the spring when the vehicle is in a normal posture and is connected to the fuel pump discharge port And a valve seat of the valve body on a partition wall that separates the weight chamber from the valve chamber. A fuel passage is formed to electrically connect and cut off the weight chamber In, the fuel passage communicating with the valve chamber is opened at the bottom of the weight chamber,
At the top, a fuel vapor discharge port that returns the fuel vapor generated by the vaporization of the fuel to the space above the fuel oil level of the fuel tank opens,
A fuel inlet opening to the fuel pump discharge opening is opened at a position at an intermediate height between the fuel vapor discharge opening and a fuel passage opening opening to the valve chamber, and the weight chamber also serves as a fuel vapor separation tank. It has a different configuration.

[Operation] When the vehicle is in a normal posture, that is, when the vehicle is not overturned, the valve body in the valve chamber is pushed down against the bias of the spring by the gravity of the weight and separated from the valve seat to form the valve chamber. The fuel passage between the weight chambers is in communication. The fuel vapor mixed in a bubble state in the fuel flowing in from the fuel inlet opening to the dead weight chamber rises in the dead weight chamber due to the difference in the specific gravity of the gas-liquid, and the fuel vapor exhaust opening at the top of the dead weight chamber The fuel, which has flown out from the outlet and has the bubbles of the fuel vapor separated and removed, flows down in the weight chamber, flows into the valve chamber, and flows out from the fuel outlet opening to the valve chamber toward the carburetor float chamber.

When the vehicle rolls over, the gravity of the weight does not act on the valve element in the valve chamber, and the valve element is seated on the valve seat by the biasing of the spring to shut off the fuel passage between the weight chamber and the valve chamber. Can roll over and the fuel in the fuel tank can be prevented from flowing out even if the float valve in the carburetor float chamber is open. (Claim 1) If the surface of the weight is formed as a rough surface having a satin finish, the separation of fuel vapor is promoted. (Claim 2) [Embodiment] FIG. 1 is a first view of a fuel passage shutoff valve according to the present invention when a vehicle rolls over.
1 is a longitudinal sectional view of the embodiment of the present invention, in which reference numeral 1 is a valve chamber in which a fuel outlet 2 is opened, a valve body 3 is accommodated, and the valve body 3 is seated by a biasing force of a spring 4 during both lateral rollovers. Are formed. Reference numeral 6 is a weight for pushing down the valve body 3 against the bias of the spring 4 to separate it when the vehicle is in a normal posture, and 7 is a weight chamber in which the weight is accommodated. 8 is a partition wall partitioning the valve chamber 1 and the weight chamber 7, and a weight receiver 8 formed integrally with the partition body 8 on the partition body 8.
-1 is formed in a funnel shape with the center line of the valve body 3 as a center line, and a small-diameter rod-shaped portion 3-1 on the upper portion of the valve body 3 slidably protrudes from the bottom of the funnel-shaped portion. It is in contact with the weight 6. 9 is the fuel inlet, 10 is the fuel vapor outlet,
-1 is an aperture. The throttle 10-1 secures the fuel pressure in the fuel passage from the fuel pump to the float chamber. Reference numeral 11 denotes a projecting portion for preventing the weight 6 from falling out of the weight receiver 8-1 and being unable to return to the funnel-shaped portion, and a II-II sectional arrow view is shown in FIG. There is. The fuel that has flowed from the fuel inlet 9 and the fuel vapor in a bubble state has been separated is
An annular passage 7-2 formed between a wall body 7-1 forming the weight chamber 7 and a weight receiver 8-1 is flown down to surround the small diameter rod-shaped portion 3-1 above the valve body 3. Annular gap 12 and the gap
The gas flows into the valve chamber 1 through a fuel passage formed by a through hole 13 that communicates between 12 and the bottom of the weight chamber 7, and flows out from the fuel outlet. When the vehicle rolls over, the weight 6 separates from the funnel-shaped inner surface of the weight receiver 8-1 and the upper end surface of the small-diameter rod-shaped portion 3-1 of the valve body 3, and the valve body 3 is seated by the biasing force of the spring 4. However, the fuel passage from the fuel pump to the carburetor float chamber is shut off.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1-
Reference numeral 1 denotes a housing that forms the valve chamber 1 in cooperation with the partition wall body 8, and a wall body 7 that forms the partition wall body 8 and the dead weight chamber 7.
1 and 1 are fixed by giving up.

FIG. 4 is a second embodiment in which the shape of the valve body 3 is different from that of the first embodiment shown in FIG. 1, and in the first embodiment, the valve body 3 is used.
The outer peripheral surface of the lower portion of the valve slides by being guided by a guide surface formed in the housing 1-1 forming the valve chamber 1, and the conical surface 3-2 is seated on the valve seat 5 when the vehicle rolls over. However, in the second embodiment shown in FIG. 4, the valve element 3 is composed of a disc-shaped portion 3-4 having a rod-shaped portion 3-3 having a small diameter on the upper and lower sides, and is attached to the upper surface of the disc-shaped portion. The attached packing 3-5 made of an elastic resin material is seated on the flat valve seat 5 formed on the lower surface of the partition wall 5 to shut off the fuel passage when the vehicle rolls over. The configuration other than the above of the second embodiment shown in FIG.
The configuration is the same as that of the figure, and the reference numerals in the figure indicate the same parts as the reference numerals in FIG.

FIG. 5 shows a third embodiment in which the structure is simplified. The valve chamber 1 is formed by press-fitting a valve seat body 14 into a housing 1-1 forming the valve chamber 1, and has a spherical valve body. 3, the housing 1-1 and the weight receiver 8-1 are integrally formed, and ribs or grooves 8-2 are provided on the funnel-shaped inner surface to form the weight chamber 7 and the valve chamber 1. It forms part of the fuel passage. 15 is a striking rod having a petal-shaped cross section interposed between the valve body 3 and the weight 6 for pushing down the spherical valve body 3 by the gravity of the weight 6, and the through hole of the valve seat body 14 Slide along the inner surface. Since the outer diameter of the weight receiver 8-1 and the inner peripheral surface of the wall body 7-1 of the weight chamber 7 are substantially the same,
Since the weight 6 does not fall off from the funnel-shaped surface and becomes irreversible, the protrusion 11 provided in the first embodiment is unnecessary.
Reference numerals 2, 4, 9, 10, and 10-1 indicate the same parts as the reference numerals in FIG. 1, and a wall body 7-1 forming the weight chamber 7 forms a housing 1-1 forming the valve chamber 1. It is the same as in the case of FIG. 1 that it is fixed by giving up.

The fuel passage shutoff valve of the present invention, which also uses the weight chamber 7 as a fuel vapor separation tank, can be formed integrally with the casing of the carburetor or the lid of the float chamber, as shown in FIG. Show. A case 1-1 forming the valve chamber 1 and a wall body 7-1 forming the weight chamber 7 are integrally formed with the case of the carburetor or the floating chamber lid, and the valve chamber 1 and the weight chamber 7 are formed. The partition wall body 8 and the weight receiver 8-1 for partitioning are separated from each other and are fitted in the weight chamber 7 in an airtight manner. Reference numeral 16 is a float chamber, 17 is a float, 18 is a float valve, 19 is a valve seat body of the float chamber, and other reference numerals are the same as the reference numerals in FIG. 1, but further description is omitted. .

If the surface of the weight 6 is formed as a rough surface with a satin finish, the separation of fuel vapor can be promoted.

[Advantages of the Invention] By constructing the fuel passage isolation valve for the vehicle overturning that also has the fuel vapor separation function, the fuel vapor isolation device and the fuel passage isolation valve for the vehicle overturning are provided more separately than in the case where they are separately arranged in the vehicle. The layout can be facilitated and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of a fuel passage shutoff valve according to the present invention when a vehicle rolls over, and FIGS. 2 and 3 are sectional views taken along arrows II-II and III-III of FIG. 1, respectively. FIG. 4 is a vertical sectional view of the second embodiment, FIG. 5 is a vertical sectional view of the third embodiment, and FIG. 6 is a sectional view taken along the line VI-VI of FIG. FIG. 7 is a view showing an embodiment in which the fuel passage shut-off valve according to the present invention is formed integrally with a carburetor housing or a floating chamber lid, and FIGS. 8 and 9 are arranged in an air breather passage of a fuel tank. FIG. 8 is a diagram showing a conventional configuration of a fuel cutoff valve when the vehicle rolls over. 1 ... valve chamber, 2 ... fuel outlet, 3 ... valve element, 4 ... spring, 5 ... valve seat, 6 ... weight, 7 ... weight chamber, 8
...... Partition wall, 8-2 ...... Ribs or grooves, 9 ...... Fuel inlet, 10 ...... Fuel vapor discharge port, 11 ...... Weight drop-out prevention projections, 12 ...... Annular gap, 13 ...... Transmission Hole, 14 ... Valve seat, 15 ...
… Impulse, 16 …… Float chamber, 17 …… Float, 18 …… Float valve, 19
...... Valve seat body in the float chamber.

Claims (2)

[Scope of utility model registration request] 1. A fuel passage cutoff valve which is arranged in a fuel passage connecting a carburetor float chamber and a discharge port of a fuel pump to prevent fuel from flowing out of the carburetor float chamber when the vehicle rolls over. The fuel outlet (2) communicating with the carburetor float chamber is opened, the valve body (3) is accommodated, and the valve body (3)
When the vehicle is in a normal posture, the valve chamber (1) is formed with a valve seat (5) that is seated by the biasing force of the spring (4) when the vehicle rolls over, and the vehicle is located above the valve chamber (1). A weight (6) for accommodating the valve body (3) against the urging force of the spring (4) and separating it from the valve seat (5) is housed and connected to the discharge port of the fuel pump. And a cylindrical weight chamber (7) having an opening for a fuel inlet, the weight chamber (7)
The valve chamber (1) and the weight chamber (7) are seated on or separated from the valve seat (5) of the valve body (3) on a partition wall (8) that separates the valve chamber (1) from the valve chamber (1). A fuel passage (13) communicating with the valve chamber (1) at the bottom of the weight chamber (7), in which a fuel passage is formed between
Is opened, and a fuel vapor discharge port (10) for returning the fuel vapor generated by the vaporization of fuel to the space above the fuel oil surface of the fuel tank is opened at the top, and the fuel vapor discharge port (10) and the valve chamber (1 ), A fuel inlet (9) leading to the discharge port of the fuel pump is opened at a position intermediate the height of the fuel passage opening, and the weight chamber (7) also serves as a fuel vapor separation tank. A fuel passage shutoff valve when the vehicle rolls over. 2. The fuel passage shutoff valve according to claim 1, wherein the surface of the weight has a satin finish to promote the separation of the fuel vapor.