JPH07103833B2 - Fuel cut-off valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention is a fuel which is disposed in the upper part of a fuel tank and which allows fuel vapor to flow to a canister and prevents liquid fuel from flowing to the canister. The present invention relates to a cutoff valve (hereinafter referred to as a cutoff valve).

<Prior Art> As a conventional cut-off valve V0, the one shown in FIG. 7 is known (see Japanese Utility Model Laid-Open No. 63-138236).

The cut-off valve V0 is provided on a top plate 1 made of synthetic resin having a through hole 1a and an upper surface side of the top plate 1, and is connected to the through hole 1a to form an outflow passage P0. And a nipple 2 that is integrally formed with the nipple 2. The outflow passage P0 is, as shown in FIG. 6, a canister C.
Will be connected to.

The top plate 1 is integrally formed with a cylindrical case 3 formed on the lower surface side so as to surround the through hole 1a.

Further, in the case 3, a float valve 4 capable of closing the through hole 1a by a bottom plate 5 arranged and fixed to the lower portion of the case 3 is housed. Reference numeral 6 is a coil spring that biases the float valve 4 upward.

In the conventional cut-off valve V0, a safety valve 7 is provided on the top surface of the top plate 1 at the rear of the nipple 2 in order to eliminate a sudden pressure increase in the fuel tank T.

The safety valve 7 is configured by arranging ball valves 8 so that the insertion hole 1b formed in the top plate 1 can be closed, and the ball valve 8 is a coil spring whose one end is restricted by a lid body 10 made of synthetic resin. It is urged downward by 9. The safety valve 7 is provided on the top plate 1 through the assembly hole 2a of the nipple 2 and the ball valve 8
The coil spring 9 is provided, and the lid 10 is provided by being fixed to the periphery of the assembly hole 2a at the rear portion of the nipple 2 using ultrasonic welding or the like.

<Problems to be Solved by the Invention> However, in the conventional cutoff valve V0, the float valve 4
However, the safety valve 7 is attached to the top plate 1 from the lower side, which is opposite to the assembling direction.

Therefore, when assembling the cutoff valve V0,
It is necessary to assemble the safety valve 7 to the top plate 1 from above the top plate 1 and then reverse the top and bottom of the top plate 1 to assemble the float valve 4, the coil spring 6 and the bottom plate 5 from above. Top plate 1 during the V0 assembly process
It is difficult to carry out automatic assembly by a machine because it requires time and effort to reverse.

Further, the lid 10 that constitutes the safety valve 7 is a cutoff valve.
Since V0 appears on the outer surface side of the fuel tank T after it is attached to the fuel tank T, sufficient dimensional accuracy is required for the lid 10 and the assembly hole 2a, and the airtightness with the nipple 2 is required. Strict sealability is required for the lid 10 and the mounting hole
It becomes necessary to secure sufficient dimensional accuracy with 2a, and it takes a lot of time to fix the lid 10 to the nipple 2, which requires man-hours and costs for securing dimensional accuracy of each component and assembling the safety valve 7. That was the case.

By the way, as described in Japanese Utility Model Laid-Open No. 3-73657, an assembling hole penetrating vertically is provided in a lower portion of the top plate of the nipple, and the assembling hole is provided with the assembling holes from the bottom in order. If a safety valve is formed by inserting and fixing a spring, a ball valve, and a lid, it will be assembled on the lower side of the top plate, so that automatic assembly is possible and sufficient sealing of the lid is also possible. It doesn't have to be considered.

However, even if it is configured as described in the above publication, the coil spring, the ball valve, and the lid, which are small parts, are inserted into the assembly holes of the top plate in order and assembled. Therefore, it is necessary to assemble with care so as not to lose parts or erroneous assembly, and it takes time to assemble the safety valve into the assembly hole of the top plate.

This invention solves the above-mentioned problems, and can easily perform the work of assembling the safety valve into the assembling hole of the top plate, and can reduce the number of steps and the cost required for the work of assembling the safety valve. An object is to provide a cut-off valve that can be used.

<Means for Solving the Problem> A cut-off valve according to the present invention is provided on a top of a fuel tank, and has a top plate having a through hole and a flange portion for attachment to the fuel tank; A nipple disposed on the upper surface side of the plate and integrally formed with the top plate so as to communicate with the through hole to form an outflow channel, and a periphery of the through hole on the lower surface side of the top plate. A cylindrical case formed so as to surround it and a float valve housed in the case and capable of closing the through hole by a restricting member arranged at a lower portion of the case, and a float valve disposed in the outflow passage. A cut-off valve provided with a safety valve that eliminates a pressure increase in the fuel tank, the assembly valve having a vertical assembly hole at a lower position of the nipple on the top plate. The safety valve is installed And a valve body to be assembled to the assembly, and the assembly is made by inserting the previously assembled assembly into the assembly hole from a lower side of the top plate. By fixing the body to the top plate, the body is assembled in the mounting hole of the top plate.

<Operation / Effect of Invention> In the cut-off valve according to the present invention, an assembling hole that vertically penetrates is formed at a lower position of the nipple on the top plate, and the assembling hole is used to from the lower side of the top plate. A safety valve composed of a preassembled assembly can be assembled.

Therefore, the safety valve can be assembled from the lower side of the top plate in the same manner as the float valve and the regulating member, and it is not necessary to reverse the top plate during the assembly of the cut-off valve, and the automatic assembly can be easily performed.

Further, an assembling hole is formed at a lower position of the nipple on the top plate, and a safety valve is assembled by using the assembling hole of the top plate.
After attaching the cutoff valve to the fuel tank,
Since the part where the safety valve is assembled does not appear on the outer surface side of the fuel tank, strict airtightness is not required when the safety valve is attached to the assembly hole.

Further, the safety valve is assembled to the mounting hole of the top plate by inserting the preassembled assembly into the mounting hole from the lower side of the top plate, and fixing the assembly body to the top plate to assemble it. Therefore, unlike the conventional method, it is not necessary to sequentially install coil springs, valve bodies, etc. in the mounting holes of the top plate, and no parts will be lost or misassembled, and safety valves for the mounting holes of the top plate will not occur. It is possible to easily perform the assembling work of, and it is possible to reduce the man-hours and the cost required for the assembling work of the safety valve.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

The cut-off valve V1 of the first embodiment shown in FIGS.
Similarly to the conventional case, a top plate 11 made of synthetic resin such as polyacetal having a through hole 11a is provided, and the top plate 11 is arranged on the upper surface side of the top plate 11 and communicates with the through hole 11a to form the outflow passage P1. Board 11
And a nipple 12 integrally formed with the nipple 12. The outflow passage P1 is connected to the canister C as shown in FIG.

Then, the top plate 11 has a flange portion 11c arranged in an annular shape one step down, and on the lower surface side of the inner peripheral edge of the flange portion 11c, a cylindrical shape formed so as to surround the periphery of the through hole 11a. The case 13 is integrally formed.

Further, in the case 13, by the bottom plate 15 as a restricting member that is locked to the locking legs 13a formed in the lower portion of the case 13,
A float valve 14 made of polyacetal or the like capable of closing the through hole 11a is housed. Note that 15a is a locking hole of the locking leg 13a, and 16 is a coil spring that biases the float valve 14 upward.

The cutoff valve V1 is provided with a safety valve 17 at a lower position behind the nipple 12 on the top plate 11 in order to eliminate a rapid pressure increase in the fuel tank T.

This safety valve 17 is an assembling hole formed in the top and bottom direction of the top plate 11.
The ball valve 18, the coil spring 19, the stop plate 20, and the assembly body 21 that are mounted on the valve body 11b are assembled in advance from the assembly body 17 (see FIGS. 1 to 3).

The assembling body 21 is made of synthetic resin such as polyacetal and has a substantially cylindrical shape with a bottom. An insertion hole 21a is formed at the bottom with a slanted peripheral edge, and an ultrasonic wave is formed around the peripheral edge of the assembly hole 11c. A flange portion 21b that is fixed by welding or the like is formed. Further, a through hole 21c opening to the outflow passage P1 is formed on the outer peripheral surface above the flange portion 21b, and a fitting groove for fitting the fitting protrusion 20b of the stop plate 20 on the inner peripheral surface of the upper end. 21d is formed.

The stop plate 20 is formed of a synthetic resin such as polyacetal in a substantially disc shape, and has a holding protrusion 20 to which the upper end of the coil spring 19 is fitted.
In addition to a, the outer peripheral surface is provided with a fitting protrusion 20b that fits in the fitting groove 21d of the assembly 21. Also, the holding protrusion 20a
A jig hole 20c for inserting a needle-shaped jig 24 used for facilitating disposition of the stop plate 20 at the time of assembling the assembly 17 is pierced at the center of the (17). See figure).

Reference numeral 22 is a retainer such as a sheet metal, and 23 is a gasket.

Next, the assembling of the cutoff valve V1 will be described.

First, the assembly 17 that constitutes the safety valve 17 is assembled. To assemble this assembly 17, the ball valve 18 and the coil spring 19 are inserted into the assembly 21, the jig 24 is inserted into the jig hole 20c, and the jig 24 is inserted into the coil spring 19. The guide plate of the jig 24 pushes down the stop plate 20, and while the upper end of the coil spring 19 is held by the holding protrusion 20a, the fitting protrusion 20b is fitted into the fitting groove 21d, and the stop plate 20 is attached to the assembly body 21. After being engaged, the jig 24 is pulled out from the jig hole 20c to assemble the assembly 17 as the safety valve 17.

Then, with the case 13 side of the top plate 11 facing upward, the assembled safety valve 17 is inserted into the assembling hole 11b, the flange portion 21b of the assembling body 21 is welded to the periphery of the assembling hole 11b, and the safety valve 17 is attached. Assemble.

After that, with the case 13 side of the top plate 11 facing upward, the float valve 14 and the coil spring 16 are inserted into the case 13, and the locking legs 13a are locked to the peripheral edge of the locking hole 15a. 13 to the bottom plate
15 should be locked.

Then, the cut-off valve V1 can be manufactured by disposing the retainer 22 and the gasket 23 on the upper and lower surfaces of the flange portion 11c of the top plate 11, and then the retainer 22, the flange portion 11c of the top plate 11, and the gasket 23. The cut-off valve V1 can be used if it is mounted on the fuel tank T using the mounting hole (not shown).

As described above, in the cutoff valve V1 according to the first embodiment, the safety valve 17 is located on the lower side of the top plate 11 in the same manner as the float valve 14 and the bottom plate 15 (in the assembly mode described above, the top plate 11 is reversed). Since each component is assembled in this state, it can actually be assembled from the top side of the top plate 11), and there is no need to reverse the top plate 11 during the assembly of the cut-off valve V1. It can be automatically assembled by a machine.

Further, the assembling hole 11 is provided at the lower position of the nickel 12 on the top plate 11.
c is formed, and the safety valve is
17 is assembled, and after the safety valve 17 is covered with the nipple 12 and the cut-off valve V1 is attached to the fuel tank T, the assembly portion of the safety valve 17 is exposed on the outer surface side of the fuel T. Therefore, strict airtightness is not required when the safety valve 17 is fixed to the assembling hole 11c.

Further, the safety valve 17 is assembled to the assembling hole 11b of the top plate 11 by assembling the preassembled assembly 17 to the assembling hole 11b on the lower side of the top plate 11 (when actually assembling, as described above. ,
The upper side of the top plate 11) is inserted, and the flange portion 21b of the assembly body 21 is fixed to the top plate 11 to assemble, so that the coil spring, the valve body, etc. are sequentially installed in the conventional manner. Does not have to be assembled in the assembly hole of the top plate, parts are not lost or misassembled, and the safety valve 17 can be easily assembled in the assembly hole 11b of the top plate 11. It is possible to reduce the man-hours and costs required for the assembly work.

Incidentally, after the cut-off valve V1 is attached to the fuel tank T, normally, the fuel vapor G in the fuel tank T passes through the through hole 13b of the case 13 and the through hole 15b of the bottom plate 15 and then the float valve 14 And between Case 13
It flows out from the outflow passage P1 to the canister C through the through hole 11a.

Further, when the liquid fuel F in the fuel tank T rises, the float valve 14 rises to come into contact with the peripheral edge of the through hole 11a and close the outflow passage P1.

Further, when the inside of the fuel tank T becomes an abnormal positive pressure state, the ball valve 18 rises against the urging force of the coil spring 19 to open the insertion hole 21a, and the inside of the fuel tank T is opened. The fuel vapor G and the air are caused to flow out to the outflow passage P1 to eliminate the pressure increase in the fuel tank T.

In the cut-off valve V1 of the first embodiment, the case where the safety valve 17 as an assembly is assembled to the periphery of the assembly hole 11b formed in the inner part of the case 13 is shown. Like the cut-off valve V2 of the second embodiment,
Assembling hole 1 in flange 11c of top plate 11 at the lower position of 12
1b may be formed, and the safety valve 17 as the assembly 17 may be attached to the outer side portion of the case 13 using the assembling hole 11b.

Further, in the cutoff valve V1 of the first embodiment, the safety valve
As the valve 17, a ball valve 18 and a coil spring 19 are used. However, as in the third embodiment shown in FIG. 5, the safety valve 27 is replaced by a rubber umbrella valve 28 as the valve body. And a substantially disc-shaped synthetic resin assembly 29,
It may consist of 27.

In the cutoff valve V3 of the third embodiment, the shaft portion 28 of the valve 28 is fitted into the fitting hole 29b of the assembly 29 having the plurality of through holes 29a.
b is fitted, and the umbrella-shaped lip 28a of the valve 28 is configured so as to cover the through hole 29a of the assembly body 29.
The rim 9 is welded and assembled to the rim 11b of the top plate 11 by ultrasonic welding or the like. The cut-off valve V3 of the third embodiment also has the same effect as the cut-off valve V1 of the first embodiment.

The safety valve 27 as an assembly 27 including the umbrella-shaped valve 28 is a cut-off valve V2 of the second embodiment shown in FIG.
As described above, at the lower position of the nipple 12, it can be arranged on the flange portion 11c of the top plate 11.

[Brief description of drawings]

1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is an exploded perspective view of the same embodiment, FIG. 3 is an exploded perspective view of a safety valve of the same embodiment, and FIG. FIG. 5 is a sectional view showing a second embodiment, FIG. 5 is a sectional view showing a third embodiment, FIG. 6 is a schematic view showing a state in which a cut-off valve is attached to a fuel tank, and FIG. It is sectional drawing which shows an example. 11 ... Top plate, 11a ... Through hole, 11b ... Assembly hole, 12 ... Nipple,
13 ... Case, 14 ... Float valve, 15 ... (Regulation member) bottom plate,
17/27 ... Assembly / Safety valve, 18 ... (Valve body) Ball valve, 21
・ 29 ... Assembly, 28 ... (Valve body) Valve, P1 ... Outflow passage,
V1, V2, V3 ... Cut-off valve.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F16K 31/18 C

Claims (1)

[Claims] 1. A top plate which is disposed on an upper portion of the fuel tank and has a through hole and a flange portion for mounting on the fuel tank; and a through hole which is disposed on an upper surface side of the top plate and which has the through hole. A nipple that is integrally formed with the top plate so as to communicate with each other to form an outflow passage; and a cylindrical case that is formed so as to surround the periphery of the through hole on the lower surface side of the top plate, A float valve housed in the case and capable of closing the through hole by a restricting member arranged in the lower part of the case, and a float valve arranged in the outflow passage to eliminate a pressure increase in the fuel tank. A safety cutoff valve including: a safety cutoff valve, and an assembly hole that penetrates up and down at a lower position of the nipple on the top plate. Equipped with a valve body that can be assembled to the assembly In addition, the preassembled assembly is inserted into the assembling hole from the lower side of the top plate, and the assembling body is fixed to the top plate. Fuel cut-off valve characterized by being installed in the assembly hole of the plate.