JPH06872U - Pipe assembly - Google Patents

Abstract

(57) [Abstract] [Purpose] A pipe having expanded fitting parts for hose attachment at both ends is inserted into a flange mounting hole, and the middle part of the pipe is fixed to the mounting hole by welding. (EN) Provided is a pipe assembly having a structure in which welding droop and flange deformation are less likely to occur. [Structure] An enlarged diameter portion 2c having substantially the same diameter as the fitting portion 2b is formed in the intermediate portion 2a of the pipe 2, and the enlarged diameter portion 2c is attached to the mounting hole 1a.
Stick to. The enlarged diameter portion 2c is a bulging portion integrally formed with the pipe itself.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe assembly used when a pipe is attached to a container such as an automobile fuel tank, and in particular, a pipe part which is used as an intermediary when the pipe is fixed to the container and a pipe body are integrated in advance. It is about assembly.

[0002]

[Prior art]

 A conventional pipe assembly of this type is shown in FIG. The pipe assembly is composed of a flange 1 that is separately fixed to a container (not shown) and a pipe 2 that is inserted into a mounting hole 1a provided in the flange 1. The intermediate portion 2a of the pipe 2 is fixed to the mounting hole 1a by a welded portion 3. Has been done.

The pipe 2 is preliminarily formed with bulging fitting portions 2b at both ends, and a rubber hose 5 is fitted to each fitting portion 2b by using a clip 4 or the like as shown in FIG. It is fixed and the inside and outside of the container are connected. When applied to a fuel tank for automobiles, it is used to suck up gasoline in the fuel tank by a fuel pump and supply it to the engine.

In the procedure for assembling the above-mentioned pipe assembly, first, a pipe having bulged fitting portions 2b at both ends is prepared, and one fitting portion 2b of this pipe 2 is inserted from the mounting hole 1a of the flange 1. . Since the mounting hole 1a is formed to be slightly larger than the diameter of the fitting portion 2b, there is a relatively large gap between the intermediate portion 2a of the pipe and the mounting hole 1a. Next, the predetermined position of the pipe intermediate portion 2a and the edge portion of the mounting hole 1a are fixed by welding.

[0005]

[Problems to be solved by the device]

 In the above-mentioned pipe assembly, there are fitting parts that bulge out at both ends of the pipe, and since the fitting parts are inserted, the diameter of the mounting hole is large, and there is a large gap between the pipe welding part and the mounting hole. Since the gap is formed, the welding sag portion 3a is generated as shown in FIG. As a result, the welding material increases and the welding work time becomes longer, which causes a problem in work efficiency. In addition, the longer welding time causes a large amount of heat to be added near the welded part of the flange. Deform the flange as shown in.

Therefore, in view of the above-mentioned conventional problems, the present invention has an object to provide a pipe assembly having a structure in which welding sag and flange deformation are less likely to occur.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the pipe assembly made by the present invention inserts a pipe having a diameter-increasing fitting portion for hose attachment at both ends, and inserts the pipe into the attachment hole of the flange, and inserts the intermediate portion of the pipe. In a pipe assembly fixed to the mounting hole by welding, an enlarged diameter portion having substantially the same diameter as the fitting portion is formed in the middle portion of the pipe, and the enlarged diameter portion is fixed to the mounting hole. Is characterized by.

The expanded diameter portion is a bulging portion integrally formed with the pipe itself.

A washer having a diameter larger than that of the mounting hole is loosely fitted in an intermediate portion of the pipe, and the washer and the pipe are integrally fixed to the mounting hole.

[0010]

[Action]

 In the above-mentioned structure, since the expanded portion having substantially the same diameter as the expanded fitting portion at both ends of the pipe is formed in the middle portion of the pipe, the gap between the mounting hole and the pipe is small, and there is no welding sag or deformation of the flange.

Further, since the washer is loosely fitted into the pipe and is welded to the mounting hole, there is no gap with the mounting hole, and there is no welding sag or deformation of the flange.

[0012]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same members as those in the conventional example are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 1 shows a first embodiment of the present invention, and the structure of the flange 1, the mounting hole 1a, the pipe 2, and the fitting portions 2b at both ends is the same as the conventional structure. The feature of this embodiment is that the enlarged diameter portion 2c is formed in the welded intermediate portion 2a of the pipe 2. The expanded diameter portion 2c is formed at the same time when the pipe body is molded, and has a diameter substantially equal to that of the fitting portions 2b at both ends.

At the time of welding, one end of the pipe 2 is inserted into the mounting hole 1a of the flange 1 and the enlarged diameter portion 2c is welded to the mounting hole 1a as in the conventional case. The gap between the mounting hole 1a and the expanded diameter portion 2c should be small enough so that the expanded diameter portion 2c can be inserted through the mounting hole 1a, so that welding sag of the welded portion 3 is unlikely to occur.

FIG. 2 shows another embodiment of the present invention, in which the structure of the flange 1, the mounting hole 1a, the pipe 2, and the fitting portions 2b at both ends is the same as the conventional one. The feature of this embodiment resides in the washer 6 loosely fitted in the intermediate portion 2a of the pipe 2. The washer is loosely fitted to the pipe middle portion 2a before forming the fitting portions 2b at both ends on the pipe 2, and its outer diameter is made larger than the diameter of the mounting hole 1a.

At the time of welding, one end of the pipe is inserted into the mounting hole 1a of the flange, and the washer 6, the mounting hole 1a and the pipe intermediate portion 2a are integrally welded. . Since the washer 6 has an inner diameter substantially the same as the outer diameter of the pipe 2, there is almost no gap between the washer 6 and the pipe 2. Further, since the washer 6 is loosely fitted in the pipe 2 in advance, the outer diameter of the washer 6 can be formed larger than the fitting portions 2b at both ends of the pipe. Therefore, there is no gap between the washer 6 and the mounting hole 1a. In this way, there is no risk of welding sag.

3 and 4 show modifications of the welding structure in the embodiment using the washer 6 of FIG.

In the structure of FIG. 3, the washer 6 is sandwiched by the pedestal 7 below the recess 1b formed near the mounting hole 1a of the flange 1 and welded from the recess 1b side. This structure can reduce the amount of welding material used.

In the structure shown in FIG. 4, the outer diameter of the washer 6 is substantially the same as the inner diameter of the flange recess 1b, and the washer 6 is fitted in the recess 1b. With this structure, it becomes easy to position the pipe 2 with respect to the flange 1 in the direction of the flange 1 surface.

[0020]

[Effect of device]

 As described above, according to the present invention, since the expanded portion which is substantially the same as the expanded fitting portion at both ends of the pipe is formed in the middle portion of the pipe, the gap between the mounting hole and the pipe is the expanded portion or the washer. Since it is filled with the small size, the welding sag and the deformation of the flange are less likely to occur, so that the effect is obtained that the pipe assembly with good dimensional accuracy can be assembled.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of a pipe assembly according to the present invention.

FIG. 2 is a sectional view of a second embodiment of the present invention.

FIG. 3 is a main part explanatory view showing a modification of the second embodiment.

FIG. 4 is an essential part explanatory view showing another modification of the second embodiment.

FIG. 5 is a cross-sectional view of a conventional pipe assembly.

FIG. 6 is an explanatory diagram illustrating a connection between a pipe and a rubber hose.

FIG. 7 is a diagram for explaining the deformation of the flange after welding.

[Explanation of symbols]

 1 Flange 1a Mounting hole 2 Pipe 2a Pipe middle part 2b Fitting part 2c Expanding part 3 Welding part 6 Washer

Claims (3)

[Scope of utility model registration request] 1. A pipe assembly in which a pipe having expanded-diameter fitting portions for attaching a hose at both ends is inserted into a mounting hole of a flange, and an intermediate portion of the pipe is fixed to the mounting hole by welding. A pipe assembly, wherein an enlarged diameter portion having substantially the same diameter as the fitting portion is formed at an intermediate portion of the pipe, and the enlarged diameter portion is fixed to the mounting hole. 2. The pipe assembly according to claim 1, wherein the enlarged diameter portion is a bulging portion integrally formed with the pipe itself. 3. A pipe assembly in which a pipe having enlarged-diameter fitting portions for hose attachment at both ends is inserted into a mounting hole of a flange, and an intermediate portion of the pipe is fixed to the mounting hole by welding. A pipe assembly in which a washer having a diameter larger than that of the mounting hole is loosely fitted in an intermediate portion of the pipe, and the washer and the pipe are integrally fixed to the mounting hole.