JPH0512237U - Connection structure between inlet pipe and fuel tank - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] In connecting the inlet pipe and the fuel tank, it prevents the fuel from leaking as a bellows type polyethylene pipe that hardly affects the cost and copes with slippery defects of the pipe. Set it as a structure to solve. [Structure] The inlet pipe and the metal supply port pipe 3 are provided with stepped mountain-shaped locking bulging portions 7,
Is fitted on each one side of the locking bulging portion with a packing 8 interposed therebetween, and the bulging portion is tightened by a chevron-shaped band 9, or between the inlet pipe and the metal supply port pipe and the polyethylene pipe. The ring is fitted in and then tightened with a chevron band.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for connecting an inlet pipe and a fuel tank, and comprises the inventions of claims 1 and 2, wherein the invention of claim 1 is a bellows-shaped polyethylene pipe, a gasket, and a band having a chevron cross section. The invention of claim 2 is fixed so as not to cause fuel leakage by a bellows-shaped polyethylene pipe and a sealing ring such as an O-ring and a band having a chevron cross section. The invention of claim 2 relates to the invention in which the invention of claim 1 is the specific invention and the main parts of the matters essential to the industrial field of use and structure are the same. .

[0002]

[Prior Art]

 As shown in FIG. 6, the conventional inlet pipe-fuel tank connection structure is such that an oil resistant linear flexible NBR rubber hose b is fitted and connected to the inlet pipe a, and then the rubber hose b is connected. The metal replenishing port pipe d of the fuel tank c is fitted into and connected to each other, and the respective connecting portions are fastened and fixed by the flat band e, which has a drawback that the amount of fuel permeation (fuel leakage) is large. In order to reduce this amount of permeation, it is necessary to use a material such as fluorocarbon rubber, which is costly, which makes profitability poor.

[0003]

[Problems to be solved by the device]

 The present invention uses the bellows-shaped polyethylene pipe, which has almost no effect on the cost, due to the large amount of fuel permeation, which is the above-mentioned conventional defect, as a countermeasure against the conventional defect, and the slippery defect of the pipe is eliminated. It is an object of the present invention to solve the problem of making a corresponding connection structure.

[0004]

[Means for Solving the Problems]

 The connection structure of the inlet pipe and the fuel tank according to the present invention comprises claims 1 and 2, wherein the connection pipe 5 is connected to the inlet pipe 1 or the metal supply port pipe 3 of the fuel tank 2. The pipe 5 uses a bellows-shaped polyethylene pipe 6 capable of a permeation amount (leakage amount) of about 1/3 to 1/5 of the fuel permeation amount of the conventional NBR rubber hose, and the inlet pipe 1 or the metal supply port pipe 3 Is formed with a bulging portion 7 having a mountain-shaped cross section, and the end portion 6a of the pipe 6 is attached to the slope 7a of the bulging portion 7 on the polyethylene pipe 6 side through a gasket 8 having a C-shaped cross section. It is characterized in that it is elastically expanded and fitted, and a band 9 having a chevron cross section is fitted and tightened and fixed on the outer periphery of the sloped surface 7b of the locking bulging portion 7 on the fuel supply side or the fuel tank side and the end portion 6a. It is a thing. According to a second aspect of the present invention, the polyethylene pipe 6 of the first aspect is fitted to the inlet pipe 1 or the metal supply port pipe 3 with a seal ring 11 press-contacted to the inlet pipe 1 or the metal supply port pipe 3, The end 6a of the pipe 6 is fitted on the slope 7a of the locking bulge 7 on the refueling side of the pipe 6, and the end 7a of the lock bulge 7 on the fuel supply port side or the fuel tank side and the end It is characterized in that a band 9 having a mountain-shaped cross section is fitted and clamped and fixed on the outer periphery of the portion 6a.

[0005]

【Example】

 FIG. 1 shows an outline of each embodiment of claims 1 and 2, 1 is an inlet pipe made of metal, synthetic resin or the like, 2 is a fuel tank, 3 is a metal supply port of the fuel tank 2. A pipe, 5 is a connecting pipe, and 9 is a band having a mountain-shaped cross section. 2 and 3 show the embodiment of claim 1, in which the connecting pipe 5 has a permeation amount (leakage amount) of about 1/3 to 1/5 of the fuel permeation amount of the conventional NBR rubber hose in the present invention. 2) is used to form the engagement bulge 7 having a mountain-shaped cross section on the inlet pipe 1 or the metal supply port pipe 3. A gasket 8 having a C-shaped cross section is applied to the slope 7a of the locking bulge 7 on the polyethylene pipe 6 side, and the end 6a of the polyethylene pipe 6 is fitted onto the gasket 8 to lock the bulge 7 Then, a band 9 having a mountain-shaped cross section is applied to the slanted surface 7b of the fuel tank 2 side and the outer circumference of the slanted surface of the end portion 6a so as to be fixed. (FIGS. 2 and 3 show only the metal supply port pipe 3 of the fuel tank 2, but the fitting of the inlet pipe 1 and the other end of the polyethylene pipe 6 is also symmetrical in direction. (The structure is the same)

FIG. 4 and FIG. 5 show an embodiment of claim 2 in which a bellows-shaped polyethylene pipe 6 is used, and the inlet pipe 1 or the metal replenishing port pipe 3 has a mountain-shaped locking bulging portion. Forming 7 is the same as in claim 1. The polyethylene pipe 6 is an O-ring which is welded to the inlet pipe 1 (or the inner surface fitted to the metal supply port pipe 3) with a hard material 6 _-1 as shown in the drawing and press-contacts with the inlet pipe 1 (or the metal supply port pipe 3). And the like, and the end portion 6a of the hard material 6 _-1 of the polyethylene pipe 6 is fitted to the slanted surface 7a of the locking bulging portion 7 of the supply port pipe 3 on the pipe 3 side. A band 9 having a chevron cross section is applied to the sloped portion 7b of the projecting portion 7 on the fuel tank 2 side and the outer periphery of the end portion 6a so as to be fixed by tightening. (The hard material 6 _-1 is not always necessary, and an integral polyethylene pipe 6 without welding can be used) (FIGS. 4 and 5 show only the metal supply port pipe 3 of the fuel tank 2). Although the fitting of the inlet pipe 1 and the other end of the polyethylene pipe 6 is symmetrical in direction, the structure is the same.

[0007]

[Effect of the device]

 The connection structure of the fuel tank and the inlet pipe of the present invention is the device of claim 1, wherein the connection pipe 5 is connected to the metal supply port pipe 3 of the inlet pipe 1 or the fuel tank 2. Shaped polyethylene pipe 6 is used to prevent fuel leakage in a structure that bends flexibly without raising the cost. Regarding the depression, a locking bulging portion 7 having a mountain-shaped cross section is formed on the inlet pipe 1 or the metal supply port pipe 3, and a gasket 8 having a C-shaped cross section is formed on the slope 7a of the locking bulging portion 7 on the polyethylene pipe 6 side. The end portion 6a of the pipe 6 is fitted through the end of the pipe 6 and the band 9 having a mountain-shaped cross section is provided on the outer periphery of the slanted surface 7b of the locking bulging portion 7 on the fuel supply port side or the fuel tank side and the end portion 6a. In the Umate fastening structure, a conventional fuel leakage prevention and Keii, and has an effect of dealing with slipperiness.

Further, in the invention of claim 2, the gasket 8 of the invention of claim 1 is omitted, and instead, the polyethylene pipe 6 is fitted to the inlet pipe 1 or the metal supply port pipe 3 on the inner surface thereof. A seal ring 11, such as an O-ring, which is in pressure contact with the metal supply port pipe 3 is fitted, and the other parts have the same configuration as in claim 1 except that a gasket 8 having a C-shaped cross section is used. Similarly, it is easier to prevent fuel leakage than conventional rubber hoses, and has the effect of dealing with slipperiness.

[Brief description of drawings]

1 is a schematic side view of the present invention.

FIG. 2 is a sectional side view of the embodiment of claim 1.

FIG. 3 is an assembled sectional view of the embodiment of claim 1;

FIG. 4 is a sectional side view of the embodiment of claim 2.

FIG. 5 is an assembled sectional view of the embodiment of claim 2;

FIG. 6 is a side view of a conventional example.

[Explanation of symbols]

1 inlet pipe, 2 fuel tank, 3 metal supply port pipe, 5 connecting pipe, 6 polyethylene pipe, 6a end part, 7 locking bulge part, 7a, 7b slope, 8 gasket, 9 chevron section band, 11
Seal ring

Claims (2)

[Scope of utility model registration request] 1. In a structure in which a connecting pipe 5 is connected to an inlet pipe 1 or a metal supply port pipe 3 of a fuel tank 2, a bellows-shaped polyethylene pipe 6 is used for the connecting pipe 5, and the inlet pipe 1 or the metal supply port pipe is used. 3, a locking bulge 7 having a mountain-shaped cross section is formed, and the locking bulge 7 is formed.
The end portion 6a of the pipe 6 is fitted to the sloped surface 7a on the polyethylene pipe 6 side via the gasket 8 having a C-shaped cross section, and the sloped surface 7b and the end portion 6a of the locking bulging portion 7 on the fuel supply side or the fuel tank side are fitted. A connecting structure for an inlet pipe and a fuel tank, characterized in that a band 9 having a mountain-shaped cross section is applied to the outer periphery of the fuel tank and clamped and fixed. 2. In a structure in which the connecting pipe 5 is connected to the inlet pipe 1 or the metal supply port pipe 3 of the fuel tank 2, a bellows-shaped polyethylene pipe 6 is used for the connecting pipe 5, and the inlet pipe 1 or the metal supply port pipe is used. 3 is formed with a locking bulging portion 7 having a mountain-shaped cross section, and the polyethylene pipe 6 is connected to the inlet pipe 1 or the metal supply port pipe 3
The seal ring 11 which is in pressure contact with the inlet pipe 1 or the metal replenishment port pipe 3 is fitted to the inner surface to be fitted to, and the end portion 6a of the pipe 6 is fitted to the sloped surface 7a of the locking bulging portion 7 on the pipe 6 side. A connection structure between an inlet pipe and a fuel tank, characterized in that a band 9 having a mountain-shaped cross section is applied to the outer periphery of the sloped portion 7b on the fuel supply side or the fuel tank side of the stop bulge portion 7 and the end portion 6a for tightening.