JPH02299930A - Flap valve device - Google Patents

Abstract

PURPOSE:To make a close contact between a valve seat and a flap plate evenly by providing a play at the pivoted part of the flap plate contacted onto the valve seat and also providing the point of application of a spring, pressing the back surface of the flap plate, at the center of the back surface. CONSTITUTION:A nozzle guide a provided with a nozzle inserting hole 3 is fixed in a valve main body 1 fixed in the filler tube 21 of a fuel tank. When the nozzle 22 of an oil filling gun is inserted into the nozzle inserting hole 3, a flap plate 9 pivoted about a pivot shaft 10 on the bracket 8 of the valve body 1 is slid in the direction of the shaft of the valve seat 4 due to a play of the oval hole 20 formed in the pivoted part to open the valve seat 4. When the top end of the nozzle 22 exceeds the center of the flap plate 9 on which the one end of a spring 12 inserted loosely onto the pivot shaft 10 is contacted elastically, the pivoted part of the flap plate 9 is slid toward the nozzle 22 side by the reactional force of the spring 12. Thus, various errors and dislocations are absorbed due to the above-mentioned play.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flap valve device used in a filler tube of a fuel tank or the like.

Conventional technology In vehicle fuel tanks, etc., a flap valve device is installed at the neck of the filler tube in order to prevent evaporative fuel gas (paper) inside the fuel tank from flowing out of the tank when refueling. This flap valve device prevents the paper in the tank from being discharged to the outside of the tank when the filler cap is removed during refueling, and opens to allow refueling when the refueling gun is inserted. As such a flap valve device, for example, the Utility Model Application No. 61-1
No. 27024 is known. This flap valve device has a nozzle insertion port formed to match the outside diameter of the nozzle of a specific refueling gun, and a bracket protruding from the end face of the valve body in close proximity to the valve seat.The flap plate is rotated on this bracket. In addition to being freely pivoted, the rear side of the flap plate is pressed by a spring to bring the flap plate into close contact with the valve seat.

Problem to be Solved by the Invention When a deviation occurs in the rotational fulcrum of the flap plate in the nozzle entry direction due to a molding error of the bracket or flap plate, or an assembly error, the flap plate is closed in the direction of the valve seat by a spring. Even if power is applied, the flap plate will tilt and the sealing performance between it and the valve seat will deteriorate. SUMMARY OF THE INVENTION Therefore, the present invention provides a flap valve device in which the flap plate does not tilt relative to the valve seat and can be properly brought into close contact with the valve seat to ensure sealing performance.

Means for Solving the Problem: A flap plate is rotatably supported on a bracket protruding from the end face of the valve body near the valve seat, and the rear surface of the flap plate is pressed by a spring to attach the flap plate to the valve seat. In the structure in which the flap plate or the bracket is brought into close contact with each other, a play is provided in the shaft support of either the flap plate or the bracket at least in the axial direction of the valve seat, so that the flap plate is slidably mounted, and the flap plate is attached to a substantially central portion of the back surface of the flap plate. The spring force application point is set at .

Errors in molding and assembly of the action bracket and flap plate are absorbed by the play of the flap plate shaft support, thereby avoiding tilting of the flap plate, and the flap plate receives spring force at approximately the center of the back surface. , so that it comes in close contact with the valve seat evenly.

Embodiment Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings as a flap valve device for preventing erroneous refueling of a fuel tank for a vehicle.

In Figures 1 to 6, l is a valve body that is fitted and fixed to the neck of the filler tube 21 of the fuel tank (not shown);
Inside one side of the valve body l, specifically on the filler port side of the filler tube 21, there is formed a tapered nozzle insertion port 3 whose small diameter portion is slightly larger than the outer diameter of the nozzle 22 of a specific filler gun. A nozzle guide 2 made of a resin material is fitted and fixed. Also, inside the other side of this valve body l,
Valve seat 4 with an annular seal lip 5 attached to the end face
Fit and secure. Reference numeral 6 denotes a nozzle seal whose base end is sandwiched between the fitting portion of the valve seat 4 and the valve body 1, and which is disposed at an intermediate portion between the valve seat 4 and the nozzle guide 2; 4, the seal guide 7 is provided in sliding contact with the inner end surface of the valve body 1, and even if the nozzle 22 swings in the radial direction within the valve body 1, it follows the movement of the nozzle 22 and always remains in close contact with the outer periphery of the nozzle 22 to provide a reliable seal. It is now possible to do so. Valve body! A bracket 8 is protruded from the downstream end of the filler tube 21 near the valve seat 4, and a flap plate 9 is rotatably supported on the bracket 8 by a support shaft 10. The flap plate 9 has a bracket 11 integrally, and
bracket 8 of said valve body 1
The support shaft 10 is slidably connected to the inside of the support shaft 10 and is supported by the support shaft 10 as described above.

Further, a coil spring 12 is loosely installed on this support shaft 10, and one end of the coil spring 12 is brought into elastic contact with the back surface of the flap plate 9, and the other end is brought into elastic contact with the end face of the valve body l, so that the coil spring 12 causes the flap plate 9 to is pressed against the valve seat 4 so that it fits tightly against the seal lip 5. Incidentally, as shown by the broken line in FIG. 1, a protrusion 13 is embossed on the inner surface of the flap plate 9 at a position slightly offset upward from the center thereof, and the nozzle 22
When the flap plate 9 is pushed open, the protrusion 13 rides on the outer periphery of the nozzle 22, separating the flap plate 9 from the outer periphery of the tip of the nozzle 22, and opening the nozzle 22.
The fuel jet from the tip may be prevented from hitting the flap plate 9.

A vapor flow rate 1 formed on the end face side of the valve body 1 is provided between the valve body 1 and the nozzle guide 2 through a communication hole I6.
A vapor chamber 14 is formed which communicates with the vapor chamber 5. The nozzle guide 2 has a plurality of vapor outlet ports that communicate the vapor chamber i4 with the inner circumference of the guide! 7, while the communication hole 1
6 is provided with a relief valve 18 which is biased in the valve closing direction by a spring 19. The relief valve 18 opens when the internal pressure of the fuel tank exceeds a predetermined value, and releases the generated vapor to the vapor flower 15. Communication hole 16. The flap plate 9 is bypassed via the vapor chamber 14 and the vapor outlet 17, and the fuel is discharged from a filler cap (not shown) to maintain the fuel tank internal pressure normally. Here, a long hole 20 is formed in the axial direction of the valve seat 4 in the axial support of either the bracket 11 of the flap plate 9 or the bracket 8 of the valve body 1, for example, in the axial support of the bracket 11 of the flap plate 9. This is a fun place to play.

Also, one end of the spring 12 is connected to the flap plate 9.
The spring force application point is set at the center of the back of the flap plate 9 by making elastic contact with the center of the back. The switch S in FIG. 5 is turned ON and OFF by contact with the flap plate 9, and is used to operate and deactivate electromagnetic valves such as an evaporative cut valve (not shown).

Next, the operation of opening and closing the flap plate 9 will be explained. When the nozzle 22 is inserted through the nozzle insertion port 3 of the valve body 1, the tip of the nozzle 22 comes into contact with the flap plate 9. At this time, the flap plate 9 has its elongated hole 20
It opens while sliding in the axial direction of the valve seat 4 (see Fig. 6, 1). Furthermore, when the nozzle 22 is inserted and the tip of the nozzle 22 passes over the center of the flap plate 9 which is in elastic contact with one end of the spring 12, the nozzle 22
The contact portion between the tip of the flap plate and the flap plate serves as a fulcrum, and the reaction force of the spring 12 causes the pivot support of the flap plate 9 to slide toward the nozzle 22 (see Fig. 6). On the other hand, when removing the nozzle 22, the pivot portion of the flap plate 9 slides toward the filler tube 21 when the nozzle 22 is removed beyond the center as shown in FIG. 6C.

According to the above embodiment structure, since the elongated hole 20 is formed in the axial support of the bracket 11 of the flap plate 9 in the axial direction of the valve seat 4, the bracket 8 of the valve body
Even if the fixing point of the support shaft 10 is shifted from the normal position in the axial direction of the valve seat 4, or even if the support shaft lO is tilted (see Fig. 4), the elongated hole 20 absorbs this deviation. As a result, the flap plate 9 can be prevented from being slightly inclined with respect to the valve seat 4.

Since the point of action of the force of the spring 12 is set at the center of the back of the flap plate 9, the flap plate 9 can be brought evenly into close contact with the seal lip 5 of the valve seat 4, and the flap plate 9 and the valve Sealing between the sheet 4 and the sheet 4 can be ensured.

In the above embodiment, play is provided in the bracket 11 of the flap plate 9, but play may be provided in the bracket 8 on the side of the valve body i, and this play is provided only in the axial direction of the valve seat 4. Instead, it may also be set in the plane direction.

Effects of the Invention As described above, according to the present invention, the deviation of the fixing point of the support shaft that supports the flap plate can be absorbed by the play of the pivot support of the flap plate or the bracket of the valve body, and the flap plate can be attached to the valve seat. In addition, since the point of application of the spring force is set at approximately the center of the back of the flap plate, the flap plate can be brought evenly into close contact with the valve seat.
Therefore, the seal between the flap plate and the valve seat can be perfectly achieved, and the quality and reliability can be further improved, which has a great practical effect.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing one embodiment of the present invention, Figures 2 and 3 are
The figure is the ■ arrow view of Figure 1, the ■ arrow view, and the figure 4 is the ■ arrow view of Figure 2.
5 is a sectional view showing the flap plate in an open state, and FIGS. 6a, b, and c are sectional views showing the operation of this embodiment. l... Valve body, 4... Valve seat, 8...
Bracket, 9... Flap plate, 10... Support shaft, 12... Spring, 20... Play (elongated hole). Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] (1) The flap plate is rotatably supported on a bracket protruding from the end face of the valve body near the valve seat, and the rear surface of the flap plate is pressed by a spring to bring the flap plate into close contact with the valve seat. In this structure, the flap plate is slidably attached by providing play in at least the axial support of either the flap plate or the bracket in the axial direction of the valve seat, and a spring force application point is provided approximately at the center of the back surface of the flap plate. A flap valve device characterized by being set.