JP6468097B2 - Tube connection structure - Google Patents

Description

  The present invention relates to a tube connecting structure.

  Hose forming a fluid conduit is often used in connection. In connecting a hose, a structure in which a pipe body to be connected to the hose is press-fitted and connected, or a structure in which a hose is connected using a connection pipe body different from the hose has been proposed (Patent Document 1). etc).

JP-A-8-326975 JP 2005-48857 A

  As seen in the above-mentioned patent document, various structures for connecting two pipe bodies have been proposed. However, if the connection between the two pipe bodies is to be ensured, the structure must be complicated. Moreover, the structure for fixing the tubular body becomes complicated, and the outer diameter of the connected portion becomes large. An object of the present application is to solve such problems and to provide a connection structure for connecting two pipe bodies in a compact manner.

In order to achieve at least a part of the problems described above, the present invention can be implemented as the following forms.
[Form 1]
A pipe connecting structure for connecting two pipes forming a pipe,
A connecting pipe body having engagement protrusions having larger outer diameters than the inner portions of the both ends at both ends,
A first tube that is mounted from one end of the connecting tube over one of the engaging projections;
A second tube mounted from the other end of the connecting tube over the other engaging protrusion and further mounted to a position where it is stacked on a part of the first tube mounted first; Prepared,
One or a plurality of convex portions functioning as positioning members at the time of mounting of the second pipe body are provided at predetermined positions along the pipe line direction from the mounting side hose end of the first pipe body. Provided on a part of the outer periphery of the tube body,
The first tubular body has a ridge that is convex at a height that does not hinder the diameter expansion of the first tubular body on the outer peripheral wall of the tubular body in a region where the second tubular body is laminated,
The protruding line has a protruding height smaller than the one engaging protrusion,
The convex connection height of the said protruding item | line is a tubular body connection structure which is 0.1 mm-0.3 mm.
According to this aspect, the first tubular body is engaged with one engaging convex portion of the connecting tubular body, the second tubular body is engaged with the other engaging convex portion, and both the tubular bodies are connected. After connecting through the tubular body, the second tubular body can be laminated on the first tubular body that is already attached to the connecting tubular body. Therefore, according to the tubular body connection structure of this embodiment, the outer diameter is small just by expanding the second tubular body, and the two tubular bodies can be securely fixed. Moreover, there are the following advantages in adopting such a tube connection structure. When the first tubular body is attached to the connecting tubular body from the side of the one engaging convex portion, the first tubular body is expanded in diameter. Since this first tubular body has a convex portion at a predetermined position along the pipe line direction from the end of the mounting side hose, the diameter of the first tubular body is increased even at the portion where the convex portion is formed. As a result, the engagement protrusion is overcome. Although the convex portion exhibits a reinforcing function to increase the rigidity of the forming portion, in the tubular body connection structure of this embodiment, the convex portion is provided only at a part of the outer periphery of the first tubular body, and thus the portion having no convex portion. Then, since the reinforcing function is not exhibited, the diameter of the first tubular body at the location where the convex portion is formed is not hindered. Therefore, according to the tubular body connection structure of this embodiment, a new tubular body connection structure in which the second tubular body is laminated on the first tubular body after providing the first tubular body with improved wearability is provided. it can. In addition, since the first tube has already been mounted on the connecting tube before the second tube is mounted, the convex portion of the first tube can be positioned as the second tube. Therefore, the marking operation for positioning the second tubular body becomes unnecessary. From this, according to the tubular body connection structure of this embodiment, the mounting workability of the second tubular body is also improved. Moreover, according to this form, in the lamination | stacking location of a 1st tubular body and a 2nd tubular body, since sealing performance can be exhibited by convex shape, sealing performance improves. Moreover, since the height of the ridge is 0.1 to 0.3 mm, the diameter of the first tubular body is not hindered.

  (1) According to one aspect of the present invention, a tube connection structure is provided. This tubular body connection structure is a tubular body connection structure that connects two tubular bodies that form a pipe line, and has a coupling pipe body that has engagement protrusions having outer diameters larger than inner portions of both ends at both ends. A first tube that is mounted on one end of the connection tube over the one engagement projection, and the other engagement projection on the other end of the connection tube. And a second tube mounted to a position where the first tube is stacked on a part of the first tube mounted earlier, from the mounting-side hose end of the first tube in the pipeline direction. One or a plurality of convex portions functioning as positioning members when the second tubular body is mounted are provided at a predetermined position along the outer periphery of the first tubular body.

  In the tubular body connection structure of this embodiment, the first tubular body is engaged with one engaging convex portion of the connecting tubular body, the second tubular body is engaged with the other engaging convex portion, and both pipes are engaged. After connecting the body via the connection pipe body, the second pipe body can be laminated on the first pipe body already attached to the connection pipe body. Therefore, according to the tubular body connection structure of this embodiment, the outer diameter is small just by expanding the second tubular body, and the two tubular bodies can be securely fixed. Moreover, there are the following advantages in adopting such a tube connection structure. When the first tubular body is attached to the connecting tubular body from the side of the one engaging convex portion, the first tubular body is expanded in diameter. Since this first tubular body has a convex portion at a predetermined position along the pipe line direction from the end of the mounting side hose, the diameter of the first tubular body is increased even at the portion where the convex portion is formed. As a result, the engagement protrusion is overcome. Although the convex portion exhibits a reinforcing function to increase the rigidity of the forming portion, in the tubular body connection structure of this embodiment, the convex portion is provided only at a part of the outer periphery of the first tubular body, and thus the portion having no convex portion. Then, since the reinforcing function is not exhibited, the diameter of the first tubular body at the location where the convex portion is formed is not hindered. Therefore, according to the tubular body connection structure of this embodiment, a new tubular body connection structure in which the second tubular body is laminated on the first tubular body after providing the first tubular body with improved wearability is provided. it can. In addition, since the first tube has already been mounted on the connecting tube before the second tube is mounted, the convex portion of the first tube can be positioned as the second tube. Therefore, the marking operation for positioning the second tubular body becomes unnecessary. From this, according to the tubular body connection structure of this embodiment, the mounting workability of the second tubular body is also improved.

  (2) In the tubular body connection structure of the above aspect, the convex portions may be formed to be scattered around the outer periphery of the first tubular body. If it carries out like this, a 2nd pipe body can be positioned equally around the edge part periphery of the attachment side hose end part, and the mounting | wearing form of a 2nd pipe body can be stabilized. Moreover, since the convex part is dotted as a positioning reference | standard at the time of mounting | wearing with a 2nd tubular body, mounting | wearing of a 2nd tubular body becomes easy.

  (3) In any one of the above-described tubular body connection structures, the first tubular body inhibits the diameter expansion of the first tubular body on the tubular outer peripheral wall in a region where the second tubular body is laminated. You may make it have the protruding item | line made convex by the height which does not. If it carries out like this, in the lamination | stacking location of a 1st tubular body and a 2nd tubular body, since a sealing performance can be exhibited by convex shape, a sealing performance improves. If the height of the ridge is 0.1 to 0.3 mm, the diameter of the first tubular body is not hindered.

  (4) In any one of the above-described tubular body connection structures, the first tubular body is formed by expanding the diameter of the mounting-side hose end so as to contact the inner wall of the second tubular body. May be. If it carries out like this, a sealing performance can be exhibited in the contact | abutting location of the mounting side hose edge part of a 1st tubular body, and the inner wall of a 2nd tubular body.

It is a schematic exploded view of the hose assembly product obtained with the tube connection structure according to the embodiment. It is explanatory drawing which shows a 1st hose by sectional view along the 2-2 line in FIG. It is explanatory drawing which shows a cross-sectional view and shows a hose assembly goods along a hose axial direction. It is explanatory drawing which shows the hose assembly goods of a 1st modification by sectional view along a hose axial direction. It is explanatory drawing which shows the hose assembly goods of a 2nd modification by cross-sectional view along a hose axial direction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic exploded view of a hose assembly 10 obtained by the tubular body connection structure according to the embodiment, and FIG. 2 is a cross-sectional view of the first hose 20 taken along line 2-2 in FIG. FIG. 3 is an explanatory view showing the hose assembly 10 in a cross-sectional view along the hose axial direction.

  As shown in the figure, the hose assembly 10 includes a connecting tube 40 in addition to the first hose 20 and the second hose 30 that form a fluid conduit. The first hose 20 is made of an appropriate resin such as polyamide (PA) such as nylon, ethylene vinyl alcohol copolymer (EVOH), etc., and is disposed at an unillustrated location such as a vehicle engine by taking an arbitrary route. Arranged in a room or the like. As shown in FIGS. 1 and 2, the first hose 20 is attached to the connecting tube body 40 from the attachment end 22 which is one end thereof, and four convex portions 21 are provided on the outer peripheral wall of the hose at equal pitches around the outer peripheral wall of the hose. Prepare. That is, the convex portion 21 is provided in a partial region around the outer peripheral wall of the first hose 20. The formation position of the convex portion 21 in the hose path direction will be described later.

  The second hose 30 is formed of an appropriate rubber material such as polybutadiene, nitrile, or chloroprene, and has an inner diameter that can be expanded to overlap the first hose 20. This 2nd hose 30 is arrange | positioned with the 1st hose 20 taking arbitrary paths, after connecting with the 1st hose 20 using the below-mentioned connection pipe body 40. As shown in FIG. Since both the second hose 30 and the above-described first hose 20 are expanded in diameter and attached to the connecting pipe body 40 described later, the hardness may be any as long as the diameter can be expanded.

  The connecting pipe body 40 is used for connecting the first hose 20 and the second hose 30, and includes a first engaging convex portion 43 at one end of the straight pipe main body 42 and a second engaging convex portion 44 at the other end. The connecting pipe body 40 is molded from a thermoplastic resin such as polyacetal or polyamide so that the pipe shape of the straight pipe main body 42 and the shapes of both engaging projections can be constantly maintained.

  Next, the order in which the hose is assembled until the hose assembly 10 is obtained will be described. First, the first hose 20 is attached to the connection tube body 40 from the first engagement convex portion 43 side. That is, the first engaging convex portion 43 is inserted into the hose opening of the mounting end 22 of the first hose 20, and the connecting tube body 40 is press-fitted into the first hose 20. By this press-fitting, the first hose 20 is engaged with the first engagement convex portion 43 with the mounting end 22 positioned before reaching the second engagement convex portion 44 as shown in FIG. This engagement is performed in a diameter-enlarged region surrounding the first engagement convex portion 43 by overcoming the first engagement convex portion 43 while the first hose 20 expands in diameter. The first hose 20 has the convex portion 21 so that the convex portion 21 is positioned in the course of the straight pipe main body 42 in the press-fitting completion state in which the mounting end 22 is positioned before reaching the second engaging convex portion 44. It is provided apart from the mounting end 22. Therefore, the diameter of the first hose 20 is once increased even at the location where the convex portion 21 is formed, and the first hose 20 climbs over the first engaging convex portion 43, and further press-fits the connecting tube body 40, the convex portion 21 is moved to the straight pipe main body 42. Position it in the middle of the route.

  After the press-fitting of the first hose 20 is completed, the second hose 30 is attached to the connection tube body 40 from the second engagement convex portion 44 side. In other words, the second engaging convex portion 44 of the connecting tube 40 to which the first hose 20 has been attached is inserted into the hose opening of the attachment end 31 of the second hose 30, and the first hose 20 has been attached to the second hose 30. The connecting tube body 40 is press-fitted. By this press fitting, as shown in FIG. 3, the second hose 30 is laminated on the first hose 20 until the mounting end 31 reaches the convex portion 21 of the first hose 20 that is already mounted on the connecting pipe body 40. The mounting of the second hose 30 is completed. In the state where the mounting is completed, the second hose 30 is engaged with the second engagement convex portion 44 of the connection pipe body 40, and this engagement is performed while the second hose 30 is expanded in diameter. This is done in a diameter-enlarging region that goes over 44 and surrounds the second engaging convex portion 44. When the mounting of the second hose 30 is completed, the first hose 20 is engaged with the first engaging convex portion 43 of the connecting pipe body 40, and the second hose 30 is engaged with the second engaging convex portion 44 to be connected. A hose assembly 10 is obtained in which the second hose 30 is laminated on the first hose 20 that is already attached to the tube body 40. FIG. 3 shows a state in which the mounting end 31 faces the convex portion 21 with a gap, but the second hose 30 may be mounted until the mounting end 31 contacts the convex portion 21. Good.

  As described above, in the hose assembly 10 of the present embodiment, the first hose 20 is engaged with the first engagement convex portion 43 of the connection pipe body 40, and the second hose 30 is engaged with the second engagement convex portion 44. And the two hoses 30 are connected to each other via the connecting pipe body 40, and the second hose 30 is laminated on the first hose 20 that is already attached to the connecting pipe body 40. Therefore, according to the hose assembly product 10 of the present embodiment, the outer diameter is small just by expanding the diameter of the second hose 30, and the two hoses can be securely fixed.

  In the hose assembly product 10 of the present embodiment, when adopting a tube connecting structure in which the second hose 30 is laminated on the first hose 20, the mounting end 22 is positioned in front of reaching the second engagement convex portion 44. Until the mounting of the hose 20 is completed, the diameter of the first hose 20 is increased at the place where the first engagement convex portion 43 gets over. Since the first hose 20 in the hose assembly product 10 of the present embodiment is in a state where the mounting is completed, the convex portion 21 is positioned on the first engagement convex portion 43 side in the straight pipe main body 42. At the time of mounting on the connecting pipe body 40, the diameter of the convex portion 21 is increased and the first engaging convex portion 43 is overcome. When the first hose 20 expands in diameter at the formation portion of the convex portion 21 and climbs over the first engagement convex portion 43, the convex portion 21 exhibits a reinforcing function to increase the rigidity of the formation portion. As shown in FIG. 1 and FIG. 2, the assembly product 10 includes only four convex portions 21 at an equal pitch around the outer peripheral wall of the hose. Therefore, according to the hose assembly 10 of the present embodiment, the diameter of the first hose 20 can be prevented from being hindered at the location where the convex portion 21 is formed. A new pipe connection structure in which the second hose 30 is laminated on the one hose 20 can be provided.

  In the hose assembly product 10 of the present embodiment, the first hose 20 is already attached to the connecting tube 40 before the second hose 30 is attached. Can be positioned. As a result, according to the hose assembly product 10 of the present embodiment, the marking operation for positioning when the second hose 30 is attached becomes unnecessary, so that the workability of attaching the second hose 30 can be improved. Further, the omission of the marking work process can improve work efficiency and reduce work costs.

  In the hose assembly product 10 of the present embodiment, the convex portions 21 are dotted at equal pitches around the hose outer peripheral wall of the first hose 20. Therefore, according to the hose assembly product 10 of the present embodiment, the second hose 30 can be evenly positioned around the end portion of the mounting end 31 to stabilize the mounting form of the second hose 30. Moreover, since the convex part 21 is dotted as a positioning reference | standard at the time of mounting | wearing with the 2nd hose 30, it can mount | wear easily so that the 2nd hose 30 may be laminated | stacked on the 1st hose 20. FIG.

  Next, a modified example will be described. FIG. 4 is an explanatory view showing the hose assembly 10A of the first modified example in a cross-sectional view along the hose axial direction.

  As shown in the drawing, the hose assembly 10A of the first modified example connects the first hose 20 and the second hose 30 using the connecting pipe body 40 in the same manner as the hose assembly 10 described above. It is characterized by having a plurality of small ridges 23 on the outer peripheral wall of 20 hoses. The small ridges 23 are formed with a height of 0.1 to 0.3 mm from the hose outer peripheral wall of the first hose 20, and the convex tops are joined to the inner peripheral wall of the second hose 30 laminated on the first hose 20. Let Even at the location where the small ridges 23 are formed, the diameter of the first hose 20 is increased when the first hose 20 is mounted. Therefore, the diameter expansion of the first hose 20 at the formation location is not hindered. The small ridges 23 are joined to the inner peripheral wall of the second hose 30 on the convex top by joining the first hose 20 and the second hose 30, specifically the outer peripheral wall of the first hose 20 and the second hose 30. It exhibits sealing performance with the inner peripheral wall of the. Therefore, according to the hose assembly 10 </ b> A of this modified example, the sealing performance of the laminated portion of the first hose 20 and the second hose 30 can be improved without impairing the mounting performance of the first hose 20.

  FIG. 5 is an explanatory view showing the hose assembly product 10B of the second modified example in a cross-sectional view along the hose axial direction.

  As shown in the drawing, the hose assembly 10B of the second modified example connects the first hose 20 and the second hose 30 using the connecting pipe body 40 in the same manner as the hose assembly 10 described above. 20 is characterized in that the mounting end 22a is an enlarged opening end. As shown in the figure, the mounting end 22 a whose diameter has been increased is positioned in front of the second engagement convex portion 44 of the connection pipe body 40 and then abuts against the inner wall of the second hose 30. Therefore, according to the hose assembly 10B of this modified example, the gap between the inner wall surface of the first hose 20 and the connecting pipe body 40, specifically, the first engagement convex portion 43 and the outer wall surface of the straight pipe main body 42 is leaked. The fluid can be sealed at a contact portion between the mounting end 22a having an enlarged diameter and the inner wall of the second hose 30.

  The present invention is not limited to the above-described embodiment, and can be realized with various configurations without departing from the spirit of the present invention. For example, the technical features of the embodiments corresponding to the technical features in each embodiment described in the summary section of the invention are intended to solve part or all of the above-described problems, or part of the above-described effects. Or, in order to achieve the whole, it is possible to replace or combine as appropriate. Further, if the technical feature is not described as essential in the present specification, it can be deleted as appropriate.

  In the above-described embodiment, the convex portions 21 are provided around the hose outer peripheral wall of the first hose 20 at an equal pitch. However, only one convex portion 21 may be provided. In addition, a plurality of convex portions 21 may be provided at equal pitches or a plurality of irregular pitches may be provided as long as the hose diameter expansion at the location where the convex portions 21 are formed is not hindered.

  In the hose assembly 10A of the first modification, the small protrusions 23 of the hose assembly 10B of the second modification may be formed on the hose outer peripheral wall of the first hose 20. Further, in the hose assembly 10A of the first modification shown in FIG. 4, the hose band Hb may be used to bind the stacking range of the first hose 20 and the second hose 30. Rise. The hose band Hb can be used for the hose assembly 10B shown in FIG. 5 as well as the hose assembly 10 shown in FIGS.

  Further, when a pipe connection structure for connecting two pipe bodies forming a pipe line is provided, a connection pipe body having engagement projections having outer diameters larger than inner portions of the both end parts at both ends, and the connection pipe A first tube body that is mounted over one of the engaging projections from one end of the body, and over the other engagement projection from the other end of the connecting tube body, and further the mounting If the second tubular body is mounted to a position where it is stacked on a part of the first tubular body, the outer diameter of the second tubular body is reduced just by expanding the diameter of the second tubular body. One tube can be securely fixed.

DESCRIPTION OF SYMBOLS 10, 10A, 10B ... Hose assembly product 20 ... 1st hose 21 ... Convex part 22, 22a ... Installation end 23 ... Small convex strip 30 ... 2nd hose 31 ... Installation end 40 ... Connection pipe body 42 ... Straight pipe main body 43 ... 1st engagement convex part 44 ... 2nd engagement convex part Hb ... hose band

Claims (2)

A pipe connecting structure for connecting two pipes forming a pipe,
A connecting pipe body (40) having engagement protrusions (43, 44) having outer diameters larger than inner portions of the both end portions at both end portions;
A first tubular body (20) mounted from one end of the connecting tubular body (40) over one of the engaging protrusions (43);
Mounted from the other end of the connecting tube (40) over the other engaging projection (44) to a position where it is stacked on a part of the first tube (20) mounted earlier. A second tubular body (30)
One that functions as a positioning member when the second tube (30) is mounted at a predetermined position along the pipe line direction from the mounting side hose end (22) of the first tube (20). A plurality of convex portions (21) are provided on a part of the outer periphery of the first tubular body (20) ,
The first tubular body (20) is convex on the outer peripheral wall of the tubular body in a region where the second tubular body (30) is stacked at a height that does not hinder the diameter expansion of the first tubular body (20). The projected ridge (23),
The protruding line (23) has a protruding height smaller than the one engaging protrusion (43),
The protruding structure of the said protruding item | line (23) is a tubular body connection structure which is 0.1 mm-0.3 mm .   The tube connection structure according to claim 1, wherein the convex portions (21) are provided around the outer periphery of the first tube (20).

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