JPH08303646A - Pipe with u-bolt - Google Patents

Abstract

PURPOSE: To ensure sealing property sufficiently when a pipe in which an U-bolt is temporarily fastened beforehand is connected to the other pipe. CONSTITUTION: Two embossings 25a, 25b are arranged in parallel with each other on the prescribed position of an inserted pipe 2 of a pipe with an U-bolt. A bracket 3 is supported to the pipe 2 in a condition in which a thin wall part 33 is arranged in a space between both embossings 25a, 25b and a notch part 38 abuts on the inserted part 22 of the pipe 2. Both legs 41, 42 of an U-bolt 4 are loosely engaged with first and second inserting hole, and nuts 46, 47 are installed on male screw parts 41a, 42a. The nuts 46, 47 are loosely fastened to the extent that the pipe 2 is not deformed by the U-bolt 4 and the bracket 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a U-bolt-equipped pipe in which U-bolts are temporarily fixed beforehand.

[0002]

2. Description of the Related Art U-bolts have a bracket that can penetrate both legs of the U-bolt and a nut that can be screwed into male threads provided at the ends of both legs. Are connected with a high sealing property.
That is, the insertion pipe is inserted into the insertion pipe, and both legs of the U-bolt are passed through the bracket at the connecting point.
After that, attach nuts to the male threads provided on both legs of the U-bolt, and tighten the nuts to deform the pipe to be inserted and make it adhere to the pipe for insertion, ensuring the sealing property of both pipes. It is a thing.

Conventionally, U bolts, brackets and nuts are
When the product was delivered from the manufacturer to the customer, it was delivered separately from the plugged pipe. However, such separate delivery requires a process for assembling these at the customer's side, and the workability is not good. The customer asked for it.

[0004]

Therefore, initially, a part of the U bolt is welded to the insertion pipe, and then both legs of the U bolt are passed through the bracket and then lightly tightened by nuts to be integrated. I made things.

However, when a pipe for insertion is inserted into such a pipe with a U-bolt and a nut is tightened, the welded portion between the U-bolt and the pipe for insertion is hard to be deformed even if the nut is tightened, It was difficult to obtain sufficient sealability. This is because normally, as shown in FIG. 7A, only the contact point of the U-bolt 204 having a circular cross section has a pressure receiving area, so that the plugged pipe 202 is easily deformed. As shown in FIG. 7B, the contact points and the welded portion 21 of the U-bolt 204 having a circular cross section
Since 0 is the pressure receiving area, a larger force is required to deform the inserted pipe 202, which is considered to be the reason why it is difficult to obtain sufficient sealability at the welded portion.

Even if a part of the bracket is welded to the pipe to be inserted instead of welding a part of the U bolt to the pipe to be inserted, a sufficient sealing property is obtained at the welded portion as described above. There was a problem that it was hard to get. The present invention has been made in view of the above problem, and an object of the present invention is to provide a pipe with U bolts temporarily fixed thereto in advance, which can sufficiently secure the sealability when connected to another pipe.

[0007]

In order to solve the above-mentioned problems, the present invention provides a U-bolt pipe to which U-bolts are temporarily fixed, wherein a bracket that penetrates both legs of the U-bolt has a predetermined position of the pipe. The U-bolt and the bracket are loosely fastened to the pipe by fasteners attached to the legs.

Here, a protrusion may be provided near the predetermined position of the pipe. Further, at least two protrusions may be arranged side by side in the pipe axial direction, and the bracket may be arranged between the two protrusions. Further, the bracket has a thickness in the axial direction of the pipe that is equal to or less than the distance between the two protrusions, and is provided on both sides of the thin portion and the thin portion disposed between the two protrusions. May have a thickness larger than the distance between the two protrusions and a thick portion not disposed between the two protrusions.

[0009]

In the pipe with U-bolt of the present invention having the above-mentioned structure, the U-bolt is temporarily fixed beforehand.
That is, a bracket penetrating both legs of the U-bolt is arranged at a predetermined position of the pipe, and fasteners attached to the both legs loosely clamp the U-bolt and the bracket to the pipe to such an extent that the pipe is not deformed.

As described above, since the U bolt and the bracket are loosely fastened to the pipe by the fastener, the U bolt and the bracket do not fall out of the pipe, and therefore, when the U bolt and the bracket are delivered to the customer, Fasteners and pipes can be delivered together. Also, when the customer inserts another pipe into this U-bolted pipe and tightens the U-bolt and bracket tightly to the pipe with fasteners, the areas where the U-bolt and bracket are in contact with the pipe are delivered individually. Since it is the same as the case described above, the pipe is deformed as usual and sufficient sealing performance can be secured.

Here, a projection may be provided in the vicinity of the predetermined position of the pipe, and in this case, the position where the bracket is arranged can be easily determined. Further, at least two protrusions may be arranged side by side in the pipe axial direction, and the bracket may be arranged between the two protrusions. In this case, the bracket moves in the pipe axial direction by two protrusions. Regulated by Usually, when connecting pipes, insert the insertion pipe into the pipe to be inserted and use the fastener to make a U
The bolts and brackets are tightened to connect both pipes, but if the brackets can move freely in the pipe axis direction, the tightening position will shift in the pipe axis direction, and in some cases it may differ from the plugged pipe. There is a risk of tightening the part that does not overlap the plug-in pipe. However, if this configuration is adopted, such a situation can be reliably eliminated.

Further, the bracket has a thickness in the axial direction of the pipe which is equal to or less than the distance between the two protrusions, and is provided on both sides of the thin portion disposed between the two protrusions.
The pipe may have a thick portion in the axial direction of the pipe that is larger than the distance between the two protrusions and is not arranged between the two protrusions. In this case, the movement of the bracket in the axial direction of the pipe is restricted by the two projections, and at the same time, the movement of the bracket in the circumferential direction of the pipe is restricted to a predetermined range. That is, since the thick part of the bracket cannot pass between the two protrusions, the range in which the bracket can move in the pipe circumferential direction is
The thin portion stays within the range between the two protrusions. Therefore, this configuration is suitable when the fastener is tightened from the predetermined direction with respect to the U-bolted pipe.

The pipe with U-bolt of the present invention can be used as a pipe in various fields such as an automobile exhaust pipe, a water pipe, a factory pipe.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing a main part of a U-bolt-equipped pipe of this embodiment, FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a B view of FIG. 2 and 3, the nut is not shown for convenience.

The U-bolt-equipped pipe 1 of this embodiment comprises a pipe 2 for insertion, a bracket 3, a U-bolt 4 and the like. As shown in FIGS. 2 and 3, the plugged pipe 2 includes a plugged portion 22 having a diameter larger than that of the other portion 21,
An flare 23 having an enlarged diameter is formed at the end of the inserted portion 22. The inside diameter of the insertion portion 22 of the insertion pipe 2 is designed to be slightly larger than the outside diameter of the insertion pipe (not shown). At a predetermined position on the outer peripheral surface of the inserted pipe 2, a pair of (that is, two) embossments 25a, 25b are arranged in parallel in the pipe axial direction, and a bracket described later is provided between the pair of embossments 25a, 25b. Three thin portions 33 are arranged. The insertion portion 22 is provided with a linear groove 26, which is for positioning with an insertion pipe (not shown).

The bracket 3 is composed of first and second symmetrical parts.
The half members 71, 72 are welded together. The bracket 3 includes the first and second thick portions 31 and 3
2 and a thin portion 33. The first of the brackets 3,
The second thick portions 31 and 32 are formed so that the thickness in the axial direction of the pipe is larger than the gap distance d (see FIG. 3) between the embossments 25a and 25b. Therefore, the first and second thick portions 31 and 32 are formed. The parts 31 and 32 cannot pass through the gap between the embossments 25a and 25b. In addition, the first and second thick portions 31,
32 is a first that loosely fits both legs 41 and 42 of the U bolt 4,
Second insertion holes 36 and 37 are provided, respectively. The opening surface 36a of the first insertion hole 36 is the opening surface 37a of the second insertion hole 37.
Is formed at an angle of 5 to 30 degrees.
As shown in FIG. 1, the first thick portion 31 is formed so as to become narrower from bottom to top, and the first insertion hole 36 also becomes narrower from bottom to top. Has been formed.

The thin portion 33 of the bracket 3 is formed by surface-bonding the first half member 71 and the second half member 72 between the first thick portion 31 and the second thick portion 32. The thickness in the axial direction of the pipe is slightly smaller than the gap distance d between the embossments 25a and 25b. The thin-walled portion 33 has a notched portion 38 having a substantially arc-shaped notch, and ribs 39a and 39b for reinforcing the strength.
In the bracket 3, the thin portion 33 has both embossments 25a,
The pipe for insertion 2 is arranged in the gap of 25b, and the notch 38 is in contact with the insertion portion 22 of the insertion pipe 2.
Supported by.

The U-bolt 4 has a substantially circular cross section and is formed in a U-shape as a whole, and is a well-known one having male legs 41a and 42a on both legs 41 and 42. The legs 41 and 42 are respectively provided with the first and second insertion holes 36 and 37.
And nuts 46 and 47 are attached to the male screw portions 41a and 42a. This nut 46,4
7 is loosely tightened by the U bolt 4 and the bracket 3 to the extent that the inserted pipe 2 is not deformed.

Next, U of the first embodiment having the above construction
A method for assembling the bolted pipe 1 will be described. First, the pair of embossments 25a, 25b of the inserted pipe 2
The notch 38 provided in the thin portion 33 of the bracket 3 is arranged between the two. At this time, the embossed 2 is attached to the inserted pipe 2.
Since 5a and 25b are provided, the arrangement position of the bracket 3 can be easily determined. Next, the U-bolt 4 from the side opposite to the bracket 3 with respect to the inserted pipe 2
Both legs 41, 42 of the first and second insertion holes 3 of the bracket 3
6 and 37. And the male screw part 4 of the U bolt 4
The nuts 46 and 47 are attached to 1a and 42a, and the nuts 46 and 47 are tightened by the U bolt 4 and the bracket 3 to such an extent that the inserted pipe 2 is not deformed. This allows
Pipe 1 with U bolts is completed.

In this U-bolted pipe 1, the thin portion 33 of the bracket 3 has a pair of embosses 2 of the pipe 2 to be inserted.
Since it is arranged between 5a and 25b, movement of the U bolt 4 and the bracket 3 in the pipe axial direction is restricted.
Therefore, the U-bolt 4 and the bracket 3 do not fall off from the plugged-in pipe 2, and therefore the U-bolt 4, the bracket 3, the nuts 46 and 47 and the plugged-in pipe 2 are not delivered when delivered to the customer. Can be delivered as a unit.

Next, the pipe 1 with U-bolt of the first embodiment
How to use is explained. First, an unillustrated insertion pipe is inserted into the U-bolt-equipped pipe 1. At this time,
The insertion pipe is a line groove 26 of the pipe 1 with U bolts.
(See FIG. 3) is provided with a linear projection, and the linear groove 26 and the linear projection position the pipes in the circumferential direction.

Next, the nut 46 loosely fitted in the first insertion hole 36 is tightened. At this time, since the movement of the U bolt 4 and the bracket 3 in the pipe axial direction is restricted,
The occurrence of the following situations can be resolved. That is, normally, when connecting the pipes, the insertion pipe is inserted into the insertion pipe, and the U bolt and the bracket are tightened with a nut to connect both pipes, but the bracket is free to move in the pipe axial direction. If possible, the tightening position may shift in the axial direction of the pipe, and depending on the case, there is a risk of tightening a portion where the inserted pipe and the inserting pipe do not overlap. In the present embodiment, the occurrence of such a situation can be eliminated.

Further, the first and second thick portions 3 of the bracket 3
Since 1 and 32 cannot pass between the pair of embossments 25a and 25b, the range in which the bracket 3 can move in the pipe circumferential direction is the range (about 90 °) where the thin portion 33 is located between the embossments 25a and 25b. Stay Therefore, even if the bracket 3 is slightly deviated from the desired position in the circumferential direction of the pipe, the range in which the bracket 3 is displaced remains within the above range.
Easy to fix. Therefore, even when the nut 46 is tightened from the predetermined direction with respect to the U-bolt-equipped pipe 1 (for example, when the nut 46 is dipped under the automobile to tighten the nut), the nut tightening work can be performed. Almost no hindrance.

As the nut 46 is tightened, the nut 4
The lower surface of 6 contacts the opening surface 36 a of the first insertion hole 36.
At this time, the legs 41 and 42 of the U-bolt 4 are closer to each other than at the beginning, so that the U-bolt 4 is attached to the plugged pipe 2
For tightening not only in the vertical direction but also in the horizontal direction,
Improves the sealability with the insertion pipe. Here, the area in which the U-bolt 4 and the bracket 3 are in contact with the plugged pipe 2 is exactly the same as in the case where they are individually delivered, and therefore, as usual (see FIG. 7 (a)). The plug-in pipe 2 can be deformed and a sufficient sealing property can be secured.

Next, a second embodiment will be described with reference to FIG. FIG. 4 shows a pipe 1 with a U bolt according to the second embodiment.
It is an explanatory view of 01, FIG.4 (a) is explanatory drawing showing the principal part, FIG.4 (b) is a C view of FIG.4 (a). The second embodiment has the same configuration as that of the first embodiment except that the pair of embossings is provided on the plugged pipe 2, and therefore the description of the same components will be omitted.

On the outer peripheral surface of the pipe 2 to be inserted, a pair of embossments 25a, 25 are provided at a first position along the pipe axial direction.
b are juxtaposed with each other and a pair of embossments 27 are also provided at the second position
a and 27b are arranged in parallel. Here, the first position refers to a boundary portion of the thin portion 33 of the bracket 3 with the first thick portion 31, and the second position refers to the thin portion 3 of the bracket 3.
Of the three, the boundary with the second thick portion 32.

With the U-bolt-equipped pipe 101 of the second embodiment constructed as described above, substantially the same effects as the effects of the first embodiment can be obtained. However, U bolt 4 and bracket 3
Is prevented from moving not only in the axial direction of the pipe but also in the circumferential direction of the pipe, so that it is more suitable for tightening the nut 46 from a predetermined direction with respect to the pipe 2 to be inserted. Become.

Needless to say, the present invention is not limited to the above-mentioned embodiments and can be implemented in various modes without departing from the technical scope of the present invention. For example,
The opening surface 36a of the first insertion hole 36 of the bracket 3 does not have to make an angle with the opening surface 37a of the second insertion hole 37, and both may be on the same plane as shown in FIG.

Further, in each of the above-mentioned embodiments, the bracket 3 is formed by joining the first and second half members 71 and 72 together, but it may be integrally formed by die casting or the like, and in this case also. The same effect as can be obtained. In addition, although the projection is formed as an embossment in each of the above-described embodiments, the projection may be formed as a ridge having a shape extending in the circumferential direction, and in this case, the same effect as that of the above-described embodiment can be obtained. For example, as shown in FIG. 6, the thin portion 33 and the first thick portion 31
The ridges 28a and 28b may be formed from the boundary between the thin wall portion 33 and the second thick wall portion 32.

Further, in the first embodiment, the thin portion 33 of the bracket 3 has the thickness in the axial direction of the pipe which is equal to that of the both embossments 25.
Although it is formed to be slightly smaller than the gap distance d of a and 25b, this thickness may be made to coincide with the gap distance d. In this case, since the thin portion 33 and the both embossments 25a and 25b contact each other, the bracket 3 does not move at all in the axial direction of the pipe.
Therefore, the bracket 3 is positioned at a predetermined position in the pipe axial direction. However, when a slight clearance is provided between the thin portion 33 and both embossments 25a and 25b as in the first embodiment, the embossments 25a and 25b and the thin portion 33 are provided.
Both embossing 25a, 25b even if the accuracy of
This is preferable because the thin portion 33 can be surely arranged between them.

In addition, the thickness of the thin portion 33 of the first embodiment is made to match the thickness of the first and second thick portions 31 and 32, and the gap distance d between the pair of embossments 25a and 25b is the first and second thick portions. Part 3
You may form so that it may pass 1 and 32. In this case, the movement of the U bolt 4 and the bracket 3 in the pipe axial direction is restricted and the movement in the pipe circumferential direction is not restricted, but the movement in the pipe axial direction is restricted, so that the insertion pipe is inserted. In this case, it is possible to obtain the effect that there is no risk of accidentally tightening the parts other than the overlapping part of both pipes.

Further, although the pair of embossments 25a and 25b are formed in the first embodiment, only one embossment may be formed, or the plugged pipe 2 without forming any embossment. Nut 4 to the extent that the
It is only necessary to loosely tighten 6, 47. In either case, the bracket 3 or the U bolt 4 does not move unless an external force is applied, so that it can be delivered to the customer as a unit. Further, even if the pipe 2 for insertion is moved in the axial direction, since the flare 23 is provided on the pipe 2 for insertion, the U bolt and the bracket do not fall off from the pipe 2 for insertion. Furthermore, in the former case, the presence of one embossment has the effect of facilitating the positioning when disposing the bracket 3 on the inserted pipe 2.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a main part of a U-bolted pipe according to a first embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a B view of FIG. 1.

FIG. 4 is an explanatory diagram of a U-bolted pipe according to a second embodiment.

FIG. 5 is an explanatory diagram showing a main part of a U-bolted pipe according to another embodiment.

FIG. 6 is an explanatory view of a U-bolted pipe according to another embodiment.

FIG. 7 is an explanatory diagram of a conventional example.

[Explanation of symbols]

1 ... Pipe with U bolt, 2 ... Pipe for insertion, 3 ... Bracket, 4 ...
..U bolts, 25a, 25b ... Embossed,
31 ... 1st thick part, 32 ... 2nd thick part,
33 ... Thin portion, 36 ... First insertion hole,
37 ... 2nd penetration hole, 46, 47 ...
nut,

Claims (4)

[Claims] 1. A pipe with a U-bolt having U-bolts temporarily fixed in advance, wherein a bracket penetrating both legs of the U-bolt is arranged at a predetermined position of the pipe, and the U-shaped fastener is attached to the U-bolt. A pipe with a U-bolt, wherein the bolt and the bracket are loosely tightened to the pipe. 2. The pipe with a U-bolt according to claim 1, wherein a protrusion is provided near a predetermined position of the pipe. 3. The projection is at least 2 in the axial direction of the pipe.
The U-bolted pipe according to claim 2, wherein the brackets are arranged in parallel, and the bracket is arranged between the two protrusions. 4. The bracket has a thickness in the pipe axial direction that is equal to or less than a distance between the two protrusions, and is provided on both sides of the thin portion disposed between the two protrusions. The U-bolt pipe according to claim 3, further comprising: a thick wall portion having a thickness in the axial direction of the pipe that is larger than a distance between the two protrusions and is not arranged between the two protrusions.