JPS5861363A - Sealing member for fuel neck - Google Patents

Abstract

PURPOSE:To obtain a good sealing effect throughout a long period, by molding a sealing member of foaming resin to a sufficient thickness, impregnating a waterproof agent to the sealing member and using the sealing member under a fully compressed condition through tightening of bolts and nuts. CONSTITUTION:A sealing member B is made from foaming soft resin by using a foaming agent and impregnated with a waterproof agent, then a boss part 11, having a bore slightly smaller than external diameter of a fuel neck 6, and a peripheral flange 12, in internal diameter sligtly smaller than external diameter of a flange 7, are integrally molded in the sealing member B. Then a center hole 13, to which the fuel neck 6 can be inserted, is perforated in the center of the sealing member B. Further mounting holes 14, through which bolts 8 can be extended, are circumferentially formed in an equal interval on a surface of the sealing member B, under a mounting condition, the sealing member B is compressed by tightening the bolt 8 and nut 9.

Description

[Detailed description of the invention] TECHNICAL FIELD The present invention relates to an improvement in the fuel filler port of an automatic engine.

%, relates to a sealing member used to attach a fuel neck to a vehicle body.

A conventional fuel filler port is made as shown in the @/ figure and the second figure. That is, a fuel filler port 3 that is closed with a lid is formed on the outer panel of the rear fender panel 1, etc., and a cup-shaped Bethelda is spot welded inside the fuel filler port 3. A fuel neck 6 sealed with a cap S is introduced into the fuel filler port 3.
The flange 7 welded to the fuel neck 4 is fixed to the vessel QK with bolts S and nuts 9. A sealing member A is provided between the 7-ring and Bethelda to prevent spilled fuel and rainwater from entering the body.
is an intermediary.

By the way, the above-mentioned seal member A has conventionally been made in the shape of a disc with an annular lip a using rubber or synthetic rubber. The installation work is done by gluing it to the bottom in advance. However, when such a sealing member A is used, unevenness of the panel due to bumps and spot dents during molding of the petuselda and flange cannot be completely absorbed, and due to aging of the rubber etc. Problems such as deterioration of the sealing effect have arisen. In addition, in the conventional 7 fuel neck mounting structure, between the fuel neck 6 and the 7 fuel neck, between the vessel and the washer 10,
Since the flange 7 and the nut 9 are in contact with each other between metal surfaces, there is a problem that fuel, rainwater, etc. may infiltrate into the vehicle body, albeit slightly, as shown by the arrow in Figure 1. A seal member that has been used cannot reliably prevent these intrusions.

In order to solve the above-mentioned conventional problems, the present invention uses a thick foamed resin sealing member impregnated with a waterproofing agent formed into a plate shape instead of the above-mentioned rubber sealing member,
It is proposed that the sealing member be sufficiently compressed with bolts and nuts. That is, if the seal member made of foamed resin is sufficiently compressed between the vessel and the 7-lunge, sufficient restoring force will be ensured inside the seal member.

Even if the sealing material has some changes over time,
The sealing effect will not deteriorate later.

Other advantages of the foamed resin molded seal member will be clearly seen in the explanatory drawings of the embodiments described below.

Hereinafter, the present invention will be explained in detail with reference to FIGS. 3 to S.

FIG. 3 shows a sealing member B according to the invention, which is made of a soft resin foamed using a foaming agent, e.g.
Asphalt for olefin-based, ester-based, urethane-based, and phenolic resins.

Waterproofing material impregnated with a special chemical agent made of petrochemical resin such as unvulcanized butyl rubber (for example, Brideston tires)
Ltd.'s ``Everlight Seal J, etc. 1 - Made by molding into a thick disk shape.

In the sealing member B of the illustrated embodiment, the boss portion 1 has a diameter slightly smaller than the outer diameter of the fuel neck 6, and the outer periphery 7 has an inner diameter slightly smaller than the outer diameter of the flange. It is.

Therefore, when assembling the fuel neck 6 to the Petselda as shown in the figures, the boss part // is attached to the fuel neck 6, and the outer periphery flange 12 can be tightly fitted to the flange. It is possible to secure the position of the seal member B with respect to the 7-layer network without using it.

In addition, the center hole 13 into which the fuel neck t can be inserted is bored in the center of the seal member B in the illustrated example, and the diameter of the center hole 130 is the same as the natural diameter of the seal member B, as described above. ! In 1, the value is equal to the outer diameter of the fuel neck. The table rIi sum of seal member B is pol) f
Three mounting holes /4 (that can penetrate through f) are formed equidistantly in the circumferential direction, and the apertures of these mounting holes /4 (pol) have a value that coincides with the outer diameter of l. Last name is Pol)
When attaching f and nuts q+m, the seal member B is compressed from the virtual water mixing state shown in FIG. The seal member B is tightly pressed against the outer peripheral surface of the fuel neck 6 and the curved surface of the bolt t. Therefore, it is possible to completely prevent fuel, rainwater, etc. from penetrating into the vehicle body through the outer circumferential surface of the fuel neck B or the surface of the bolt groove.

In addition, when the seal member B is in a compressed state, a part of the seal member B enters into the inside of the bolt insertion hole lj of Bethelda as shown in FIG. 5, so that a complete sealing state is obtained.

What is shown in FIG. 6 is another embodiment of the present invention, in which a sealing member B having a diameter larger than that of the 7 flange 7 and having a constant wall thickness T is attached to the outer peripheral edge s/
The 7-range compatible portion 16 is compressed, leaving S, and has a wall thickness of t. Therefore, the outer periphery @/! Since the density of the flange corresponding part/B is larger than that of the bolt t, the amount of compressive deformation of the seal member B when tightening the bolt t is small, reducing the amount of tightening, improving work efficiency.

As is clear from the above description, in the present invention, the sealing member molded from foamed resin is sufficiently compressed between the vessel and the flange.

Even if the foamed resin undergoes some deterioration over time, sufficient restoring force can be ensured, so the sealing effect will not deteriorate later. Further, if the structure of the above embodiment is adopted, it becomes possible to position the sealing member without using any adhesive, and it becomes possible to obtain a structure that does not allow even the slightest leakage.

[Brief explanation of drawings]

FIG. 7 is a sectional WJ diagram of a conventional twisted material oil filler port structure, FIG. 1 is an enlarged sectional view of the main part of the gap, and FIG. 3 is a partially cutaway perspective view of the seal member of the present invention. Fig. 4 is a view corresponding to Fig. 1 of the fuel filler port using the same seal member, Fig. g5 is an enlarged cross-sectional view of the main part of Fig. 4, and Fig. 6 is an enlarged cross-section of the main part of the 8g co-embodiment of the present invention. It is a diagram. B...7-ru member, e...vessel. 6...Fuel neck, 7...7 lunge, S...
・Bolt, 9-...Nut% //...Boss part, l...Outer flange, 13-...Center hole, /4I...
Mounting hole. Patent applicant Nissan Motor Co., Ltd.

Claims (1)

[Scope of Claims] 1) A fuel neck sealing member that is interposed between the vessel and the flange of the 7 fuel neck to seal the gap between the two is a thick plate made of foamed resin impregnated with a waterproofing agent. A sealing member for a fuel neck, which is formed into a shape and is compressed and deformed by a bolt and nut that tightens the two lunges to the vessel. 2) The sealing member is tightly attached to the outer IIa of the 7-well neck or 7-lunge on the inner peripheral portion or outer lR portion [t'! The boss or outer flange that can be attached is integrally molded, and the sealing member can be installed easily. 2. The sealing member according to claim 1, wherein the sealing member is positioned by a boss-7 connection or by fitting between outer peripheral flanges. 5) The sealing member has a center hole and a mounting hole that are approximately equal to the outer diameter of the fuel neck and the outer diameter of the bolt in a natural state, and when the bolt/nut is tightened, the diameter of the center hole and the mounting hole is reduced. The sealing member according to claim 1 or 2, wherein the outer circumferential surface of the fuel neck and the outer circumferential surface of the bolt are sealed.