JPH1178548A - Mounting structure for roll-over valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To firmly lock a protecting cover to a roll-over valve, instead of welding the cover to a fuel tank. SOLUTION: A mounting flange 18 for welding a roll-over valve 3 to the outside surface of an upper wall of a fuel tank 10, and a flange 15 for loading a protecting cover 7, are provided at the outer peripheral wall of the roll-over valve 3 with a specified vertical space. A pair of right and left projections 16 are formed on the inside wall of a ring-like groove between the mounting flange 18 and the flange 15. A pair of engaging pieces 7b projected inward, are formed at curved edges 7a obtained by bending the lower end edges of the protecting cover 7 integrally provided with a half-divided inverted bowl-like part and a part of inverted U-shaped cross section. Semicircular arc-shaped parts of the curved edges 7a of the protecting cover 7 are engaged with the ring-like groove of the roll-over valve 3 to allow the pair of engaging pieces 7b of the protecting cover 7 to get over a pair of the projections 16 of the ring-like groove, and thus to lock the engaging pieces to a pair of the projections 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rollover valve mounting structure in which a protective cover for protecting the rollover valve is mounted after welding the rollover valve to a fuel tank of a vehicle.

[0002]

2. Description of the Related Art As shown in FIG. 1, even if the internal pressure of a fuel tank 10 becomes too high or too low than the atmospheric pressure,
Since it is disadvantageous in maintaining the strength of the fuel tank 10, in order to keep the fluctuation of the internal pressure of the fuel tank 10 within a predetermined range, the rollover valve 3 disclosed in Japanese Utility Model Laid-Open No. 6-22041 is used. It is configured to discharge the air 4 inside the fuel tank 10 to the outside or to suck the outside air into the fuel tank 10 through the two-way valve 2.

[0003] As shown in FIGS.
The float 14 is supported by a coil spring 20 (see FIG. 1) inside a cylindrical valve housing 11, and the fuel level swings due to rollover, turning, braking, etc. of the vehicle.
When the fuel 4a enters the inside of the valve housing 11, the float 14
Rises and hits the valve seat 13, and the fuel 4 a
To prevent it from overflowing. However, if the rollover valve 3 interferes with another member such as a floor plate and breaks when the vehicle rolls over or collides, the above function cannot be performed, and the safety of the vehicle is impaired.

Accordingly, a protective cover 21 is provided above the rollover valve 3 to prevent the rollover valve 3 from being damaged by interference with other parts such as a floor plate. That is, the synthetic resin rollover valve 3 has the mounting flange 18 fixed to the outer surface of the upper wall of the synthetic resin fuel tank 10 by welding. A protective cover 21 made of a synthetic resin covers the lower end flange 22 so as to cover the upper side of the rollover valve 3.
Welded to. However, the above-described conventional structure for mounting a rollover valve has the following problems.

(A) Connecting pipe of the rollover valve 3 (FIG. 1)
When connecting the hose 8 to the hose 8, the notch 23 of the protective cover 21 is narrow, and the connection work of the hose 8 is difficult. Notch 2
Enlarging 3 is limited in terms of protecting the rollover valve 3.

(B) To weld the rollover valve 3 and the protective cover 21 to the fuel tank 10, first,
0, the rollover valve 3 is welded, and then the protective cover 21
It is necessary to perform the work in the order of welding, and it is not possible to weld the rollover valve 3 and the protective cover 21 at the same time.

(C) For the sake of welding, the protective cover 21 must be made of the same kind of material as the fuel tank 10 or a material that is easily welded, and a material having a higher strength than the fuel tank 10 cannot be used.

[0008]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a rollover valve mounting structure in which a protective cover is securely fixed to a rollover valve without being welded to a fuel tank. Is to do.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a construction of the present invention includes a mounting flange and a protective cover for connecting the rollover valve to an outer surface of an upper wall of the fuel tank on an outer peripheral wall of the rollover valve. A pair of left and right projections are formed on the inner wall of the annular groove between the mounting flange and the flange, and a half-divided inverted bowl-shaped portion is provided. A pair of right and left engaging pieces protruding inward is formed on a bent edge obtained by bending the lower edge of the protective cover integrally provided with an inverted U-shaped section inward to bend the protective cover. A semicircular portion of the edge is engaged with the annular groove of the rollover valve, and a pair of engagement pieces of the protective cover ride over the pair of projections of the annular groove and engage with the pair of projections. It is characterized by being stopped.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, after a rollover valve is welded to a fuel tank, a hose is connected, and a protective cover is firmly locked to the rollover valve. In order to engage the protective cover with the rollover valve, another flange is provided above the mounting flange of the rollover valve to form an annular groove. A pair of left and right protrusions for preventing the protective cover from coming off is provided in the annular groove between the mounting flange and the flange.
The protective cover is provided with a pair of left and right engagement pieces at portions corresponding to the pair of projections of the rollover valve. The bent edge of the protective cover is engaged with the annular groove of the rollover valve, and at the same time, the pair of engagement pieces of the protective cover is engaged with the pair of projections of the annular groove of the rollover valve.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, a rollover valve 3 containing a float 14 is provided on the outer surface of an upper wall of a fuel tank 10 filled with fuel 4a from a fuel injection pipe 5 by a method described later. It is attached. The float 14 of the rollover valve 3 is usually separated from the valve seat 13 and communicates the inside of the valve housing 11 with the hose 8. The hose 8 is opened to the outside via the two-way valve 2. Accordingly, when the fuel tank 10 is heated by the outside air to increase the internal pressure, the air 4 is discharged to the outside via the rollover valve 3, the hose 8, and the two-way valve 2, and keeps the internal pressure at a predetermined value or less. Conversely, when the fuel 4a decreases and the internal pressure of the fuel tank 10 decreases, outside air is sucked into the fuel tank 10 via the two-way valve 2, the hose 8, and the rollover valve 3, thereby preventing an abnormal decrease in the internal pressure.
As shown in FIG. 2, the rollover valve 3 has a float 14 supported by a spring 20 at the inner bottom of a cylindrical valve housing 11 and a valve seat 13 formed on the upper wall of the valve housing 11.
Is connected to the hose 8 via the connection pipe 12. Inside the valve housing 11, a small amount of fuel 4a is supplied from the fuel tank 10.
Enter through a through hole 19 at the bottom.

According to the present invention, the flange 15 for locking the protective cover 7 and the rollover valve 3 are formed on the outer peripheral wall of the valve housing 11 made of synthetic resin at a vertical interval. A mounting flange 18 for welding to the outer surface of the upper wall of the tank 10 is integrally provided. An annular groove 17 is formed between the vertically arranged flanges 15 and 18, and the annular groove 1 is formed.
A pair of right and left protrusions 16 each having a right-angled triangular planar shape are provided on the inner wall of 7.

As shown in FIG. 3, the protective cover 7 has an inverted bowl shape in which an upper half portion is half-split, a lower half portion has an inverted U-shaped cross section, and a lower end is open. As shown in FIG. 4, the lower edge of the protective cover 7 is bent inward at a right angle to form a bent edge 7a, and the left and right bent edges 7a are formed.
A pair of right and left right-angled triangular engaging pieces 7b protrude inward from the parallel parts of a. The thickness of the bent edge 7a is set so as to engage with the annular groove 17 of the rollover valve 3. A connection pipe 12 curved forward is connected to the upper end wall of the rollover valve 3. Rollover valve 3
The lower part is fitted into an opening provided in the upper wall of the fuel tank 10, and the mounting flange 18 is welded to the outer surface of the upper wall.

After fixing the rollover valve 3 to the fuel tank 10, the hose 8 is connected, and then the protective cover 7 is
When the pair of left and right bent edges 7a is engaged with the annular groove 17 of the rollover valve 3 while horizontally moving in the direction of the arrow y, the semicircular portion of the bent edge 7a surrounds a half circumference of the annular groove 17. And the protective cover 7 covers the upper side of the connection pipe 12. Then, the left and right bent edges 7a, which are parallel to each other, are
7, the gap between the pair of engaging pieces 7b is expanded and the gap between the parallel engaging pieces 7b returns to normal when the engaging piece 7b gets over the projection 16, as shown in FIG. And 1
The pair of engagement pieces 7b are firmly engaged with the pair of projections 16 in the lateral direction. Therefore, even if the protective cover 7 is pushed in the direction opposite to the arrow y, the protective cover 7 does not come off.

[0015] The present invention is not limited to the rollover valve,
It can be applied to other valves mounted on the fuel tank.

[0016]

As described above, according to the present invention, the mounting flange for connecting the rollover valve to the outer surface of the upper wall of the fuel tank and the flange for mounting the protective cover are provided on the outer peripheral wall of the rollover valve. A pair of left and right protrusions are formed on the inner wall of the annular groove between the mounting flange and the flange, and a half-divided inverted bowl-shaped portion and a reverse U-shaped section are provided.
A pair of left and right engaging pieces protruding inward are formed on a bent edge obtained by bending the lower edge of the protective cover integrally provided with the shaped portion inward, and the half of the bent edge of the protective cover is formed. An arcuate portion is engaged with the annular groove of the rollover valve, and a pair of engaging pieces of the protective cover ride over a pair of projections of the annular groove and are locked by the pair of projections. After welding the rollover valve to the fuel tank, a hose is connected to the rollover valve, and then the protection cover is moved horizontally and engaged with the rollover valve. The workability of mounting the protective cover is improved, and the protection performance of the protective cover is improved because it is not necessary to provide a cutout in the protective cover which is conventionally required.

Unlike the conventional case, it is not necessary to consider the welding property of the material of the protective cover. The use of a high-strength material such as a steel plate improves the protective performance of the protective cover.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an outline of a fuel tank to which a rollover valve according to the present invention is attached.

FIG. 2 is a front view of the rollover valve.

FIG. 3 is a plan view showing a state in which a protective cover is attached to the rollover valve.

FIG. 4 is a front sectional view of the protective cover.

FIG. 5 is a plan view showing a state in which a protective cover is attached to a conventional rollover valve.

FIG. 6 is a front sectional view of the rollover valve.

[Explanation of symbols]

2: Two-way valve 3: Rollover valve 4: Air
5: fuel injection pipe 7: protective cover 7a: bent edge 7
b: engagement piece 8: hose 10: fuel tank 11: valve housing 12: connection pipe 13: valve seat 14: float
15: Flange 16: Projection 17: Annular groove 18: Mounting flange 19: Through hole 20: Spring 21: Protective cover 22: Flange 23: Notch

Claims (1)

[Claims] An outer peripheral wall of a rollover valve is provided with a mounting flange for connecting the rollover valve to an outer surface of an upper wall of a fuel tank and a flange for mounting a protective cover at a predetermined vertical interval. A pair of left and right protrusions are formed on the inner wall of the annular groove between the mounting flange and the flange, and the lower edge of the protective cover integrally provided with a half-divided inverted bowl-shaped portion and an inverted U-shaped cross section is formed. On the bent edge that is bent inward,
A pair of left and right engaging pieces projecting inward is formed, and a semicircular portion of a bent edge of the protective cover is engaged with an annular groove of the rollover valve, and a pair of the protective cover is formed. An installation structure for a rollover valve, wherein an engagement piece goes over a pair of projections of the annular groove and is locked to the pair of projections.