JP2020159483A - Pipe member connecting structure - Google Patents

Abstract

To connect a first pipe member and a second pipe member to each other without installing a crest-type diameter-expanded part at the first pipe member or the second pipe member.SOLUTION: A pipe member connecting structure 1 comprises a first pipe member 10, a second pipe member 20, a clamp member 30 and an annular member 40. A substantially-V shaped clamp groove 32 is formed at the clamp member, a first flange part 12 is arranged at the first pipe member, and a second flange part 22 is arranged at the second pipe member. The annular member is a member formed into an annular shape which is fit to a portion at a side in a second direction rather than the second flange part out of an external peripheral face 23 of the second pipe member, and an external peripheral face of the annular member has a third inclination face 41 and a fourth inclination face 42. The clamp member is fastened so that a first inclination face 33 of the clamp groove imparts a pressing force in the second direction to the first flange part, and a second inclination face 34 of the clamp groove imparts a pressing force in a first direction to the fourth inclination face, and thus, the first flange part and the second flange part are connected to each other.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a pipe member connection structure.

Conventionally, a type of pipe member connecting structure for connecting a first pipe member and a second pipe member using a clamp member is known (see, for example, Patent Document 1). Specifically, in the conventional pipe member connecting structure as illustrated in Patent Document 1, one of the first pipe member and the second pipe member has a mountain-shaped cross section over the entire circumference. The diameter-expanded portion (hereinafter referred to as a chevron-shaped diameter-expanded portion) is provided, and the other pipe member is provided with a flange portion (referred to as a tapered portion in Patent Document 1) having a divergent diameter. ing. Further, the clamp member is provided with a clamp groove having a substantially V-shaped cross section so as to face the inclined surface of the mountain-shaped enlarged diameter portion and the inclined surface of the flange portion. Then, the angled surface of the mountain-shaped enlarged diameter portion and the inclined surface of the flange portion are tightened by the clamp groove of the clamp member to connect the mountain-shaped enlarged diameter portion and the flange portion.

Japanese Unexamined Patent Publication No. 2005-172156

In the conventional pipe member connection structure described above, one of the first pipe member and the second pipe member is provided with a mountain-shaped diameter-expanded portion, and the mountain-shaped diameter-expanded portion can be used as a pipe member for accuracy. It is not easy to process well. In this respect, the conventional pipe member connection structure has room for improvement.

The present disclosure has been made in view of the above, and an object thereof is to provide a first pipe member and a second pipe member without providing a mountain-shaped enlarged diameter portion in the first pipe member or the second pipe member. It is to provide a pipe member connection structure which can be connected.

In order to achieve the above object, the pipe member connecting structure according to the present disclosure includes a first pipe member and a second pipe member, and a clamp member arranged outside in the radial direction of the first pipe member and the second pipe member. The first direction is defined as the direction from the second pipe member to the first pipe member among the axial directions of the first pipe member and the second pipe member. When the direction opposite to the one direction is defined as the second direction, the clamp member has a first inclined surface inclined so as to reduce the diameter toward the first direction and a reduced diameter toward the second direction. A clamp groove having a substantially V-shaped cross section having a second inclined surface inclined so as to be provided is provided, and a region extending from the end portion of the first pipe member on the side in the second direction to a predetermined distance in the first direction. Is provided with a first flange portion having a portion that faces the first inclined surface and is inclined so as to increase in diameter toward the second direction, and is provided on the side of the second pipe member in the first direction. The region extending from the end portion to the second direction extends outward in the radial direction of the second pipe member, and the maximum outer diameter is the maximum outer diameter of the first flange portion. A second flange portion smaller than the value is provided, and the annular member is an annular member fitted to a portion of the outer peripheral surface of the second pipe member on the side of the second flange portion in the second direction. The outer peripheral surface of the annular member is opposed to the first flange portion and is opposed to the second inclined surface and the third inclined surface which is inclined so as to reduce the diameter toward the first direction. It also has a fourth inclined surface that is inclined so that the diameter is reduced toward the second direction, and the first inclined surface of the clamp groove presses the first flange portion in the second direction. By tightening the clamp member so that the second inclined surface of the clamp groove applies the pressure in the first direction to the fourth inclined surface, the first flange portion and the first flange portion are provided. The second flange portion is connected.

According to the present disclosure, the first pipe member and the second pipe member can be connected without providing the mountain-shaped enlarged diameter portion in the first pipe member or the second pipe member.

It is a schematic cross-sectional view which shows typically the structure of a part of the pipe member connection structure which concerns on embodiment. It is an exploded sectional view of the pipe member connection structure which concerns on embodiment. It is a schematic cross-sectional view which shows typically the state that the clamp member which concerns on embodiment is tightened. FIG. 4A is a schematic cross-sectional view for explaining the pipe member connection structure according to the first modification of the embodiment. FIG. 4B is an exploded cross-sectional view of the first pipe member and the second pipe member of FIG. 4A. FIG. 5A is a schematic cross-sectional view for explaining the pipe member connection structure according to the second modification of the embodiment. FIG. 5B is an enlarged cross-sectional view of a portion A of FIG. 5A. It is a schematic sectional view for demonstrating the pipe member connection structure which concerns on modification 3 of embodiment. It is a schematic cross-sectional view for demonstrating the pipe member connection structure which concerns on modification 4 of embodiment.

Hereinafter, the pipe member connection structure 1 according to the embodiment of the present disclosure will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view schematically showing a partial configuration of a pipe member connection structure 1 according to the present embodiment. The pipe member connecting structure 1 includes a first pipe member 10, a second pipe member 20, a clamp member 30, and an annular member 40. Note that FIG. 1 shows a cross-sectional view of the upper half of the pipe member connection structure 1 above the axis 50 of the first pipe member 10 and the second pipe member 20, and the lower half of the pipe member connection structure 1 is shown in FIG. It has been omitted. The cross-sectional shape of the lower half of the pipe member connection structure 1 below the axis 50 is line-symmetrical with respect to the cross-sectional shape of the upper half.

A fluid flows inside the first pipe member 10 and the second pipe member 20 (inside the pipe). The specific type of the fluid is not particularly limited, and may be a gas or a liquid. The fluid according to this embodiment is, for example, a gas. Further, the first pipe member 10 and the second pipe member 20 according to the present embodiment are pipe members constituting an exhaust pipe connected to the engine. Therefore, the fluid flowing inside the first pipe member 10 and the second pipe member 20 according to the present embodiment is specifically the exhaust gas discharged from the engine.

However, specific examples of the first pipe member 10 and the second pipe member 20 are not limited to the exhaust pipe as described above. To give another example, the first pipe member 10 and the second pipe member 20 may be, for example, a pipe member constituting an intake pipe connected to an engine, or another pipe member used in a vehicle. It may be. Alternatively, the first pipe member 10 and the second pipe member 20 may be pipe members used in devices other than vehicles (for example, industrial machines).

Here, in order to facilitate the explanation, among the directions (axial directions) of the first pipe member 10 and the second pipe member 20 along the axis 50, the direction from the second pipe member 20 toward the first pipe member 10. Is defined as the "first direction", and the direction opposite to the first direction is defined as the "second direction". The fluid according to this embodiment is circulated in the second direction as an example. However, the flow direction of the fluid is not limited to this, and the fluid may circulate in the first direction.

FIG. 2 is an exploded cross-sectional view of the pipe member connection structure 1 according to the embodiment. Specifically, FIG. 2 shows a cross-sectional view of the first pipe member 10, the second pipe member 20, the clamp member 30, and the annular member 40 of the pipe member connection structure 1 of FIG. 1 in an exploded manner.

The clamp member 30 is provided with a clamp groove 32 having a substantially V-shaped cross section. Specifically, the clamp groove 32 is provided on the inner peripheral surface of the retainer portion 31 of the clamp member 30. The clamp groove 32 has a first inclined surface 33 inclined so as to decrease in diameter toward the first direction, a second inclined surface 34 inclined so as to decrease in diameter toward the second direction, and a first inclined surface 33. It has a first connecting surface 35 that connects the second inclined surface 34 and the second inclined surface 34.

The retainer portion 31 of the clamp member 30 has an annular appearance shape as a whole. Further, the clamp member 30 includes a band in which the retainer portion 31 is fixed to the inner peripheral side and a tightening member for tightening the band (in particular, FIG. 6 of Japanese Patent Application Laid-Open No. 2005-172156). It has a quick clutch, trunnion, bolt, nut, etc.), and the clamp member 30 is tightened in the diameter reduction direction by applying tension to the band by the tightening member and tightening the band in the diameter reduction direction.

A first flange portion 12 is provided in a region of the first pipe member 10 that reaches a predetermined distance from the end portion on the second direction side and the first direction. Specifically, the first pipe member 10 according to the present embodiment includes the first flange portion 12 and the first cylindrical portion 11 having a uniform inner diameter.

The first flange portion 12 has a vertical portion 13 and an inclined portion 14. The vertical portion 13 is a portion extending outward in the vertical direction with respect to the axis 50 and in the radial direction of the first pipe member 10, starting from the end surface on the second direction side of the first cylindrical portion 11. is there. The inclined portion 14 is a portion that faces the first inclined surface 33 of the clamp member 30 and is inclined so as to increase in diameter toward the second direction.

However, the configuration of the first flange portion 12 may be such that the inclined portion 14 is provided at least in a part thereof, and the vertical portion 13 may not be provided.

A second flange portion 22 is provided in a region of the second pipe member 20 that reaches a predetermined distance from the end portion on the first direction side and the second direction. Specifically, the second pipe member 20 according to the present embodiment includes the second flange portion 22 and the second cylindrical portion 21 having a uniform inner diameter. The second flange portion 22 extends outward in the radial direction, starting from the end portion on the first direction side of the second cylindrical portion 21. Specifically, the second flange portion 22 according to the present embodiment extends in the vertical direction with respect to the axis 50. Further, the maximum value of the outer diameter of the second flange portion 22 is set to be smaller than the maximum value of the outer diameter of the first flange portion 12.

In the present embodiment, the second flange portion 22 has a function as a "connecting portion" connected to the first flange portion 12. Further, in the second flange portion 22, the end portion of the annular member 40 on the first direction side comes into contact with the second flange portion 22, so that the annular member 40 does not displace toward the first direction side of the second flange portion 22. It also has a function as a "stopper portion (stopper portion for the annular member 40)" for making the above.

The annular member 40 is an annular member fitted to a portion of the outer peripheral surface 23 of the second pipe member 20 on the second direction side of the second flange portion 22. The outer peripheral surface of the annular member 40 according to the present embodiment has a third inclined surface 41, a fourth inclined surface 42, and a second connecting surface 43. The third inclined surface 41 is a surface that faces the first flange portion 12 and is inclined so that the diameter is reduced toward the first direction. The fourth inclined surface 42 is a surface that faces the second inclined surface 34 of the clamp member 30 and is inclined so that the diameter is reduced toward the second direction. The second connecting surface 43 is a surface that connects the end of the third inclined surface 41 on the second direction side and the end of the fourth inclined surface 42 on the first direction side. Further, in the annular member 40 according to the present embodiment, the inner peripheral surface thereof is a groove having a substantially V-shaped cross section, similarly to the clamp groove 32 of the clamp member 30.

With reference to FIGS. 1 and 2, the annular member 40 is the first end of the annular member 40 on the first direction side (specifically, in the present embodiment, the first inclined surface 41 of the annular member 40. The end portion on the directional side) abuts on the surface of the second flange portion 22 facing the second direction (specifically, the root portion of the surface of the second flange portion 22 facing the second direction side). In this way, it is fitted on the outer peripheral surface 23 of the second pipe member 20.

FIG. 3 is a schematic cross-sectional view schematically showing how the clamp member 30 is tightened. Clamping member 30 imparts a first flange portion 12 of the first inclined surface 33 first tube member 10 of the clamping member 30 and the second direction of the pressing against (specifically the inclined portion 14) _{(F a)} In addition, the second inclined surface 34 of the clamp member 30 is tightened so as to apply a pressure (F _b ) in the first direction to the fourth inclined surface 42 of the annular member 40. Specifically, by tightening the clamp member 30 so as to reduce the diameter, such pressure is applied from the clamp member 30 to the first flange portion 12 and the fourth inclined surface 42.

Then, when the annular member 40 is pressed in the first direction (F _b ), the end portion of the annular member 40 on the first direction side is the second with respect to the second flange portion 22 of the second pipe member 20. Applying pressure (F _b ) in one direction. As a result, the second flange portion 22 is pressed toward the first direction. As a result, the first flange portion 12 (specifically, the vertical portion 13) and the second flange portion 22 are closely connected. That is, according to the present embodiment, the first pipe member 10 and the second pipe member 20 can be tightly connected by utilizing the wedge effect of the clamp member 30 and the annular member 40.

As described above, according to the present embodiment, the first pipe member is not provided with the "mountain-shaped enlarged diameter portion" which is not easy to be formed with high processing accuracy in the first pipe member 10 or the second pipe member 20. 10 and the second pipe member 20 can be connected.

Thereby, according to the present embodiment, the processing accuracy of the pipe member connecting structure 1 can be easily improved. As a result, it is possible to prevent the fluid from leaking to the outside from the connection portion between the first pipe member 10 and the second pipe member 20 due to the poor processing accuracy. Further, according to the present embodiment, it is possible to reduce the manufacturing cost of the pipe member connecting structure 1 in that it is not necessary to provide the mountain-shaped enlarged diameter portion.

Further, according to the present embodiment, as compared with the case where the first pipe member 10 or the second pipe member 20 is provided with the mountain-shaped enlarged diameter portion, the inside of the first pipe member 10 or the second pipe member 20 The peripheral surface can be flattened. As a result, it is possible to prevent the flow of the fluid from being disturbed by the mountain-shaped enlarged diameter portion.

(Modified Example 1 of the Embodiment)
Subsequently, the pipe member connection structure 1a according to the first modification of the above embodiment will be described. FIG. 4A is a schematic cross-sectional view for explaining the pipe member connection structure 1a according to the present modification. In FIG. 4A, the clamp member 30 and the annular member 40 are not shown, and only the first pipe member 10a and the second pipe member 20a of the pipe member connection structure 1a are excerpted and shown. There is. FIG. 4B is an exploded cross-sectional view of the first pipe member 10a and the second pipe member 20a of FIG. 4A.

The pipe member connecting structure 1a according to the present modification has a point that the first pipe member 10a is provided instead of the first pipe member 10 and a point that the second pipe member 20a is provided instead of the second pipe member 20. Is different from the above-mentioned pipe member connection structure 1. Other configurations of the pipe member connecting structure 1a are the same as those of the pipe member connecting structure 1. The first pipe member 10a is different from the first pipe member 10 in that the first flange portion 12a is provided instead of the first flange portion 12. The second pipe member 20a is different from the second pipe member 20 in that the second flange portion 22a is provided in place of the second flange portion 22. The first flange portion 12a is different from the first flange portion 12 in that it does not have the vertical portion 13. The second flange portion 22a is different from the second flange portion 22 in that the second flange portion 22a is inclined so as to increase in diameter toward the second direction.

In this modification, when the first pipe member 10a and the second pipe member 20a are connected, the second flange portion 22a of the second pipe member 20a is an inclined portion of the first flange portion 12a of the first pipe member 10a. Connected to 14.

According to this modification, the contact area between the first flange portion 12a and the second flange portion 22a can be increased. As a result, the first pipe member 10a and the second pipe member 20a can be firmly connected. As a result, leakage of fluid from the connection portion between the first pipe member 10a and the second pipe member 20a can be effectively suppressed.

In this modification, the first flange portion 12a does not have the vertical portion 13, but the configuration is not limited to this. In this modification, the first flange portion 12a may further have a vertical portion 13.

(Modification 2 of the embodiment)
Subsequently, the pipe member connection structure 1b according to the second modification of the above embodiment will be described. FIG. 5A is a schematic cross-sectional view for explaining the pipe member connection structure 1b according to the present modification. In FIG. 5A, the clamp member 30 and the annular member 40 are not shown, and only the first pipe member 10a and the second pipe member 20a are excerpted and shown in the pipe member connecting structure 1b. There is. 5 (b) is an enlarged cross-sectional view of a portion A of FIG. 5 (a).

The pipe member connecting structure 1b according to the present modification is different from the pipe member connecting structure 1a according to the above-described modification 1 in that an annular seal member 60 is further provided. The seal member 60 is arranged between the first flange portion 12a and the second flange portion 22a so as to be sandwiched between the first flange portion 12a (specifically, the inclined portion 14) and the second flange portion 22a. ing. As a result, the first flange portion 12a and the second flange portion 22a according to the present modification are connected (indirectly connected) with the seal member 60 sandwiched between them.

According to this modification, since the seal member 60 is further provided, the connection portion between the first pipe member 10a and the second pipe member 20a is compared with the case where the seal member 60 is not provided. The leakage of fluid can be effectively suppressed.

The seal member 60 according to this modification may be applied to the pipe member connection structure 1 described with reference to FIGS. 1 to 3 described above. Specifically, in this case, the seal member 60 is arranged so as to be sandwiched between the first flange portion 12 (specifically, the vertical portion 13) and the second flange portion 22. Even in this case, the leakage of the fluid from the connection portion between the first pipe member 10 and the second pipe member 20 can be effectively suppressed as compared with the case where the seal member 60 is not provided.

(Modification 3 of the embodiment)
Subsequently, the pipe member connection structure 1c according to the third modification of the above embodiment will be described. FIG. 6 is a schematic cross-sectional view for explaining the pipe member connection structure 1c according to the present modification. The pipe member connecting structure 1c according to this modification is different from the pipe member connecting structure 1 described with reference to FIG. 1 in that an annular member 40c is provided instead of the annular member 40. Other configurations of the pipe member connecting structure 1c are the same as those of the pipe member connecting structure 1.

The point that the inner peripheral surface (the portion fitted to the outer peripheral surface 23 of the second pipe member 20) of the annular member 40c is a "flat cylindrical inner peripheral surface" in which no groove or recess is formed. Is different from the annular member 40.

Also in this modification, as in the above-described embodiment, the first pipe member 10 or the second pipe member 20 is not provided with the “mountain-shaped enlarged diameter portion” which is not easy to form with high processing accuracy. The pipe member 10 and the second pipe member 20 can be connected.

The pipe member connecting structure 1a according to the modified example 1 and the pipe member connecting structure 1b according to the modified example 2 may also be provided with the annular member 40c instead of the annular member 40.

(Modified Example 4 of the Embodiment)
Subsequently, the pipe member connection structure 1d according to the modified example 4 of the above embodiment will be described. FIG. 7 is a schematic cross-sectional view for explaining the pipe member connection structure 1d according to the present modification. The pipe member connecting structure 1d according to this modification is different from the pipe member connecting structure 1 described with reference to FIG. 1 in that an annular member 40d is provided instead of the annular member 40. Other configurations of the pipe member connecting structure 1d are the same as those of the pipe member connecting structure 1.

The annular member 40d has an annular member 40 in that the third inclined surface 41 of the annular member 40d is in contact with the first flange portion 12 in a state where the first flange portion 12 and the second flange portion 22 are connected. Is different. Specifically, the third inclined surface 41 of the annular member 40d according to the present modification is in contact with the inclined portion 14 of the first flange portion 12. That is, in the annular member 40d according to this modification, the end portion of the annular member 40d on the first direction side corresponds to the second flange portion 22 in a state where the first flange portion 12 and the second flange portion 22 are connected. The third inclined surface 41 of the annular member 40d is in contact with the inclined portion 14 of the first flange portion 12.

Also in this modification, as in the above-described embodiment, the first pipe member 10 or the second pipe member 20 is not provided with the “mountain-shaped enlarged diameter portion” which is not easy to form with high processing accuracy. The pipe member 10 and the second pipe member 20 can be connected.

The pipe member connecting structure 1a according to the modified example 1 and the pipe member connecting structure 1b according to the modified example 2 may also include the annular member 40d instead of the annular member 40. Further, also in the annular member 40c according to the above-described third modification, the third inclined surface 41 of the annular member 40c may be configured to abut on the inclined portion 14 of the first flange portion 12.

Although the embodiments and modifications according to the present disclosure have been described above, the present disclosure is not limited to such specific embodiments and modifications, and further various aspects are described within the scope of claims. It can be transformed and changed.

1,1a, 1b, 1c, 1d Pipe member connection structure 10,10a First pipe member 12, 12a First flange portion 20, 20a Second pipe member 22, 22a Second flange portion 23 Outer peripheral surface 30 Clamp member 32 Clamp groove 33 First inclined surface 34 Second inclined surface 40, 40c, 40d Circular member 41 Third inclined surface 42 Fourth inclined surface 50 Axis line 60 Seal member

Claims (3)

A first pipe member and a second pipe member, a clamp member arranged outside in the radial direction of the first pipe member and the second pipe member, and an annular member are provided.
Of the axial directions of the first pipe member and the second pipe member, the direction from the second pipe member toward the first pipe member is defined as the first direction, and the direction opposite to the first direction is the second direction. When defined as direction,
The clamp member has a substantially V-shaped cross section having a first inclined surface inclined so as to reduce the diameter toward the first direction and a second inclined surface inclined so as to reduce the diameter toward the second direction. A shaped clamp groove is provided,
The region of the first pipe member that reaches the first direction at a predetermined distance from the end on the second direction side faces the first inclined surface and increases in diameter toward the second direction. A first flange portion having an inclined portion is provided,
A predetermined distance from the end of the second pipe member on the side in the first direction, and a region extending to the second direction extends outward in the radial direction of the second pipe member and has an outer diameter. A second flange portion is provided such that the maximum value is smaller than the maximum value of the outer diameter of the first flange portion.
The annular member is an annular member fitted to a portion of the outer peripheral surface of the second pipe member on the side of the second flange portion in the second direction, and the outer peripheral surface of the annular member is: A third inclined surface that faces the first flange portion and is inclined so as to reduce the diameter toward the first direction, and a third inclined surface that faces the second inclined surface and is inclined toward the second direction. It has an inclined fourth inclined surface and
The first inclined surface of the clamp groove applies a pressure in the second direction to the first flange portion, and the second inclined surface of the clamp groove applies the second inclined surface to the fourth inclined surface. A pipe member connecting structure in which the first flange portion and the second flange portion are connected by tightening the clamp member so as to apply pressure in one direction. The pipe member connecting structure according to claim 1, wherein the second flange portion is further inclined so as to increase in diameter toward the second direction. Claim 1 or 2 further includes an annular sealing member arranged between the first flange portion and the second flange portion so as to be sandwiched between the first flange portion and the second flange portion. The pipe member connection structure described in 1.

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