JPS6118521A - Structure of pouring-in pipe of gasoline tank for automobile - Google Patents

Abstract

PURPOSE:To certainly connect a pipe body and a mouthpiece airtightly and watertightly by fixing the pipe body and the cylinder part of the mouthpiece by the press-fitting of a rubber ring and the fastening of a cap through screwing. CONSTITUTION:A metal mouthpiece 6 forms a cylinder part 7 for insertion. A rubber ring 8 press-fitted between a pipe body 1 and a crown-shaped cap 10 having a screw groove 9 engaged with a screw groove 4 on the inner surface of the side part are freely fitted onto the cylinder part 7, which is inserted up to the insertion stop stage surface 5 in the pipe body 1. Then the cap 10 is fitted onto the body 1 and fastened through screwing. As for said cylinder part 7, a protuberant ring 12 is formed onto the outer surface at the position corresponding to the intermediate part of the press-fitted rubber ring 8, and the press-fitted surface by the rubber ring 8 is bent and widened. The cap 10 can be strengthened by installing two strips of rings 13 in projection onto the outer surface of the inner edge part of a head part 10a and installing several strips of reinforcing ribs 14 in projection onto the outer surface of the side part 10b.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a connection structure between a hollow-molded synthetic resin inlet pipe body connectable to an automobile gasoline tank and a metal cap. .

<Problems to be Solved by the Invention> This type of automobile gasoline tank consists of a tank, an inlet pipe body including a gas venting tube, and an inlet mouthpiece. Many steps were required for assembly, etc. Recently, due to the demand for cost reduction and weight reduction, proposals have been made to mold and manufacture the inlet pipe, including the tank and gas vent tube, using synthetic resin and connect them by heat welding. Because it is still desired to be made of metal due to the relationship with the gasoline injection device and lid, it is difficult to connect them.〇The general method is to blow-mold the injection port pipe body made of synthetic resin. It seems to be better to support the metal cap with a mandrill or the like and connect it by insert molding, but because the materials between them are different, insert molding partially There is a chance that a gap will form and gas will leak from there, or there is a risk of this happening.

Gas from vaporized gasoline is highly flammable, so
When using synthetic resin for the inlet pipe, it is necessary to reliably eliminate gas leakage.

<Object of the Invention> The present invention eliminates the insert molding connection of the metal cap when molding the inlet pipe body using synthetic resin.
The cap is tightened and connected to the injection port pipe body after molding, thereby eliminating the risk of gas leakage.

<Structure of the Invention> The main body of the inlet pipe is hollow-molded using a synthetic resin material and is connectable to an automobile gasoline tank made of synthetic resin in an airtight and watertight manner, and a metal pipe body to be inserted into the base of the pipe. Each cap with a cylindrical part for insertion is formed separately, and a rubber ring with a wedge-shaped cross section is press-fitted between the pipe body and the cylindrical part of the cap to be inserted into the pipe body. The reason is that the cap is airtightly connected to the layered cap that is screwed on.

Embodiment> An embodiment will be described below based on the drawings. As shown in FIG. 1, the inlet vibrator body 1a is hollow-molded in a bent shape using a synthetic resin material so that it can be connected airtightly and watertight to a gasoline tank 2 made of synthetic resin. The inner surface of the end of the pipe body l on the side where the cap is attached has a base end enlarged to facilitate insertion of the cylindrical portion of the cap and to insert a tightening rubber ring (made of fluoro rubber) to be described later. It has a taper 3, and the outer surface is provided with a threaded groove 4 for tightening with a cap. Further, the inner surface of the pipe body 1 is provided with a stepped surface 5t for preventing the insertion of the cylindrical portion of the cap.

The metal cap 6 has a cylindrical part 7 for insertion having a length of g,
A rubber ring 8 press-fitted into the cylindrical portion 7 between the pipe body l and a layered cap 10 having a threaded groove 9 that engages with the threaded groove 4 in the side inner plate are loosely fitted, and the pipe body Insert the cylindrical portion 7 at the insertion stop step surface 5t inside the cap L.
The O is placed over the main pipe L and tightened by screwing.

In the process, the rubber ring 8 is press-fitted into the gap between it and the taper 3, and the cylindrical portion 7 of the cap 6 is connected in an airtight manner. Since the fluororubber forming the rubber ring 8 is highly elastic,
A packing made of synthetic resin or metal or a washer U is inserted between the cap 10 and the cap 10 to prevent the cap 10 from rotating together when the rotary screw is tightened.

Further, the cylindrical portion 7 of one cap is provided with a raised ring 12 on the outer surface at a position corresponding to the middle portion of the rubber ring 8 to be press-fitted, so that the crimped surface by the rubber ring 8 is expanded. The cap 10 has 25f! on the outer surface of the inner end of the head portion IQa. ! The outer surface of the side portion 10b may be reinforced with several reinforcement strips and ribs 14 may be provided on the outer surface of the side portion 10b.

Furthermore, the cap 10 has a thin skirt 15 (
It may be cylindrical or may be divided into four sides as shown in the figure), and the end of this skirt 15 is wrapped around the inlet pipe 1 and inserted into the inside of a band 17 which is secured with a screw 16. This can prevent the cap 10 from returning or loosening due to vibrations or the like.

To prevent the skirt 15 from being pinched, a through hole 18 is provided in each reinforcing rib 14 of the cap 10, and a plate portion 19 is provided at a corresponding position during molding of the inlet pipe l, and a stop hole 20 provided in the plate portion 19 is connected to the inlet pipe l. It can be replaced by passing a wire or belt 21 between them and tightening them.

<Effects of the Invention> The inlet pipe body of the present invention is hollow-molded using a synthetic resin material, the cylindrical part of a metal cap is inserted into the pipe body, and a rubber ring is inserted between the pipe body and the cylindrical part of the cap. The press-fitting of the cap and the tightening of the cap are fixed by screwing.
Unlike the connection by insert molding, this method has the effect of making the connection between the pipe body and the cylindrical part of the cap reliably airtight and watertight.

4. Brief explanation of aspects Figure 1 is a side view showing the connection to an automobile gasoline tank in six states, Figure 2 is an example of the skirt being tightened with a band, showing the connection between the inlet pipe body and the cylindrical part of the mouthpiece. Sectional view shown, 3rd
The figure is a vertical perspective view showing an example of reinforcing the cap, FIG. 4 is a sectional view showing the connection part in an example of binding with wire or band,
The figure is a sectional view showing an example of inserting a washer and packing, l is the inlet pipe body, la is the gas vent tube, 2 is a synthetic resin automobile gasoline tank, 3 is a taper, 4 is a screw groove, and 5 is an insertion stop step. 6 is a metal base, 7 is the same,
Cylindrical part, 8 is a rubber ring, 9 is a threaded groove, 10 is a cap,
U is packing or washer, 12 is a raised ring, 13 is a ring, 14 is a reinforcing rib, 15 is a scar), 16 is a screw,
17 is a band, 18 is a through hole, 19 is a plate, 20 is a stop hole, and 21 is a wire or belt.

Patent applicant: Araki Mold Manufacturing Co., Ltd. la ] Wow 5th area

Claims (1)

[Claims] (1) An inlet pipe body that is hollow-molded using a synthetic resin material and that is connectable to a synthetic resin automobile gasoline tank, and a metal pipe body that is inserted into the end of the pipe body. Each cap with a cylindrical part for insertion is formed separately, and a rubber ring with a wedge-shaped cross section is press-fitted between the pipe body and the cylindrical part of the cap to be inserted, and is tightened and screwed onto the outer surface of the end of the pipe body. A structure of an inlet pipe for an automobile gasoline tank, characterized in that the inlet pipe is connected airtight with a crown-shaped cap. (2) The structure according to claim 1, wherein the cap has several rings protruding from the inner outer surface of the head portion, and protruding reinforcing ribs are provided on the outer side surface. (8) The structure according to claims 1 and 2, characterized in that a packing or a washer is inserted between the head portion of the cap and the rubber ring to facilitate screwing of the cap. (4) The cap has several skirts protruding from the side ends, and the skirt ends are wrapped around the inlet pipe body and held in place by a screw-fastened band. Structures according to ranges 1 to 3. (6) The reinforcing rib of the cap has a through hole at the end, and a belt or wire is passed between the reinforcing rib and the stop hole in the plate provided on the outer surface of the inlet pipe to be tightly bound. Structures according to ranges 1 to 3. (6) Claim 1, characterized in that the inlet pipe body is provided with a stepped surface on its inner surface to prevent the entry of the cylindrical portion of the mouthpiece.
Structure according to items 5 to 5. (7) The structure according to any one of claims 1 to 6, wherein the cylindrical portion of the cap is provided with a raised ring on the outer surface corresponding to the middle of the rubber ring.