JPH063693Y2 - Seal structure for attachment holes of accessory devices in vehicle fuel tanks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a seal structure of an attachment device mounting hole portion such as an oil collecting cylinder in a vehicle fuel tank.

2. Description of the Related Art As an example of a sealing structure of an accessory mounting hole formed in a vehicle fuel tank, for example, as shown in FIGS. 1A and 1B, a mounting hole is formed on the upper surface of the accessory mounting hole defining wall 2. The fixing ring 4 is attached so as to surround the fixing ring 4, and the bottom portion of the fixing ring 4 is welded and fixed to the upper surface of the accessory device mounting hole defining wall 2, and at the inner peripheral region of the fixing ring 4 or in FIG. 1C. As shown in the figure, the elastic ring 5 is arranged on the upper surface of the fixed ring, the attachment device mounting plate 6 is placed on the upper surface of the fixed ring 4 by using the fixed ring 4 as a base, and the fixed ring 4 is screwed with bolts 7. A structure is adopted in which the elastic ring 5 is compressed to seal the space between the upper surface of the accessory mounting hole defining wall 2 and the accessory mounting plate 6.

However, in the conventional example, the auxiliary device mounting hole defining wall 2 is formed due to the deformation of the fuel tank due to the collision or the fall of the vehicle.
When a force for pushing into the tank or pushing out to the outside of the tank is applied to the peripheral portion 2'of the mounting hole 1 of the above, the elastic ring 5
There is a risk that the mounting hole defining wall 2 supporting the above will be expanded and deformed as shown by the phantom line in FIG. 1A, and due to this deformation, the compression of the elastic ring 5 will be released and the watertightness will be lost. There is a risk of leakage.

Further, in the conventional example shown in FIGS. 1A and 1B, since the fixing ring 4 and the elastic ring 5 are separately supported on the upper surface of the mounting hole defining wall 2, the elastic ring 5 and the fixing ring are fixed. There is a risk that the level of the upper surface of the ring 4 may vary, resulting in improper tightening, and thus, flaws in the seal.

Further, conventionally, as a measure for preventing the seal breakage due to the above-mentioned collision or the like, as shown in FIGS. 1B and 1C, a reinforcing means for welding a reinforcing ring 8 to the bottom surface of the defining wall 2 of the attachment device mounting hole 1 is adopted. However, a reinforcing ring 8 is provided on the bottom surface of the partition wall 2.
In addition to requiring labor for welding, the number of parts increases and the cost increases.

The purpose and structure of the invention is to form an inward flange on the fixing ring, which extends inward from the inner peripheral surface of the ring and overlaps the upper surface of the wall defining the attachment device mounting hole. The hole defining wall is turned outward toward the fixing ring inner peripheral surface toward the fixing ring inner peripheral surface, the folded piece is superposed on the upper surface of the inward flange, and the folding piece and the mounting hole defining wall are provided. The inward flange is wrapped, and an elastic ring is interposed in a compressed state between the flange wrapped by the folded piece and the attachment device mounting plate of the fuel tank placed on the upper surface of the fixed ring, By configuring the elastic ring to be carried by the fixed ring, the relative position of the fixed ring and the elastic ring and the mounting plate, and the tightening level of the sealing surface can be kept constant at all times to prevent compression failure and seal defects. In case of a collision A mounting hole for a vehicle fuel tank that can prevent deformation such as opening the sealing surface of the wall defining the mounting hole, and maintain the watertightness by maintaining the elastic ring in a good compressed state. The present invention provides a seal structure of.

Embodiments of the Invention Hereinafter, embodiments of the invention will be described in detail with reference to the drawings starting from FIG.

In FIG. 2, reference numeral 11 'indicates an attachment device mounting hole formed in the outer wall of the fuel tank 11, and 14 indicates a fixing ring.
The fixing ring 14 has a flange 15 protruding inward from the inner peripheral surface toward the inside of the ring. The bottom surface of the inward flange and the bottom surface of the fixing ring body are flush with each other, and the inward flange 15 is superposed on the upper surface of the defining wall of the attachment device mounting hole 11 ′ in the inner region of the fixing ring 14, and the inward flange is formed. An annular step portion 16 is formed on the upper surface side.

The mounting hole 11 'is formed on the upper surface of the defining wall 12 of the mounting hole 11'.
An annular step portion 13 is formed so as to surround the
The fixing ring 14 having the inward flange 15 is positionally fitted to the outer ring 3 and the bottom surface of the fixing ring 14 is welded and fixed to the bottom surface of the annular step portion 13 as required. Further, as shown in FIG. 3A, a plurality of bolt holes 21 for attaching accessory devices are formed at equal intervals on the upper surface of the fixing ring 14.

After the fixing ring 14 is installed as described above, as shown in FIGS. 4 and 5, the peripheral edge portion of the accessory device mounting hole defining wall 12 is folded back outward and wrapped around the flange 15.
That is, the periphery of the attachment hole defining wall 12 of the accessory device attachment hole defining wall 12 is outwardly folded back toward the inner peripheral surface of the fixing ring 14, the folding piece 17 is superposed on the upper surface of the inward flange 15, and the folding piece 17 is formed. The inward flange 15 is enclosed between the mounting hole defining wall 12 and the mounting hole defining wall 12.

An elastic ring 18 is arranged on the upper surface of the flange 15 wrapped by the folded piece 17, and is supported by the fixing ring 14. Further, the fixed ring 14 on which the elastic ring 18 is installed
The fuel tank accessory mounting plate 19 is placed on the upper surface, and the bolts 21 are screwed into the bolt holes 21 formed in the upper surface of the fixing ring.

By fixing the mounting plate 19 by tightening, the elastic ring 18 is compressed between the mounting plate 19 and the upper surface of the flange 15 wrapped by the folded piece 17, and the elastic ring 18 becomes strong as a reaction of the compression. A proper sealing surface is formed at each contact portion while closely contacting the mounting plate 19 and the folded piece 17 wrapped around the flange 15, and the mounting interface at the peripheral edge of the attachment hole of the fuel tank is securely sealed. .

Further, FIG. 5 shows that by bending the annular rib 17 'so that the base portion of the folded-back piece 17 projects toward the attachment device mounting plate, the lateral displacement of the elastic ring 18 at the time of compression is prevented, and it is more appropriate. In this case, the elastic ring 18 is installed at various positions to perform compression, and at the same time, the presence of the annular rib 17 'that regulates the inner diameter of the elastic ring further enhances the degree of adhesion during compression deformation.

Further, when forming the inward flange 15 on the fixing ring 14 described above, by appropriately setting the step difference of the step portion 16 between the upper surface of the fixing ring 14 and the upper surface of the flange 15, the proper compression of the elastic ring 18 is performed. You can get the quantity.

As described above, according to the present invention, an inward flange is formed on the fixing ring for mounting the attachment plate of the accessory to overlap the peripheral edge of the wall defining the attachment hole, and the flange for defining the accessory attachment hole is formed on the flange. Since the sealing structure is formed by enclosing the peripheral portion of the wall, it is possible to obtain a good reinforcing effect for the peripheral portion and a curl prevention effect for the partition wall. Even if deformation occurs in the peripheral portion of the mounting hole of the tank, the sealing portion of the mounting hole defining wall is effectively prevented from being deformed or expanded, and proper compression and sealing of the elastic ring are maintained.

In addition, by supporting the elastic ring on the fixed ring, the accuracy of the elastic ring, the attachment device mounting plate, and the sealing surface of the fixed ring can be made highly accurate, and the elastic ring is always provided with a predetermined precision necessary for compression. It is possible to maintain proper level for proper compression and eliminate the chance of fuel leakage from the sealing surface of the accessory mounting hole in the fuel tank.

Moreover, the reinforcing effect can be obtained without using the conventional reinforcing ring,
Enables reduction of parts and man-hours, cost reduction, and weight reduction.

[Brief description of drawings]

FIG. 1A is a sectional view showing a sealing structure of an attachment device mounting hole in a conventional fuel tank, FIG. 1B is a sectional view showing another conventional example, and FIG. 1C is a fuel showing yet another conventional example. FIG. 2 is a sectional view of the same tank, FIG. 2 is a plan view of an attachment hole for attaching an accessory of a fuel tank showing an embodiment of the present invention, FIG. 3A is a plan view of a fixing ring, FIG. 3B is the same sectional view, and FIG. The figure is A in FIG.
5 is a sectional view taken along line A, FIG. 5 is a sectional view showing a seal structure of another embodiment. 11 '... accessory device mounting hole, 12 ... mounting hole defining wall, 14 ...
Fixing ring, 15 ... Inward flange, 17 ... Folding piece,
18 ... Elastic ring, 19 ... Attachment device mounting plate.

Claims (1)

[Scope of utility model registration request] 1. A fixing ring surrounding an accessory mounting hole is attached to an upper surface of a wall defining the accessory mounting hole formed in a vehicle fuel tank, and an elastic ring is arranged in an inner peripheral area of the ring to fix the fixing hole. With the ring as a pedestal, the accessory mounting plate is placed on the upper surface of the ring and screwed to the ring, and the elastic ring is compressed to seal the accessory mounting hole. In the above, the fixing ring is provided with an inward flange protruding inward from the inner peripheral surface of the ring and superimposed on the upper surface of the accessory mounting hole defining wall, and the fixing ring defining wall of the accessory mounting hole defining wall is provided. The mounting hole peripheral portion is folded back outward toward the ring inner peripheral surface, the folding piece is superposed on the upper surface of the inward flange, and the folding piece is attached to the inward direction between the wall and the defining wall of the attachment hole. Wrap the flange, Seal structure accessory mounting holes in the vehicle fuel tank, characterized in that interposed an elastic ring in a compressed state between the flange and the accessory mounting plate which is Tsutsumigi in folded piece.