JP2009057890A - Connection structure of synthetic resin pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide connection structure of synthetic resin pipes preventing a burr produced at a depositing part from flowing into a passage or to outside in such a case when producing the plurality of pipes having level differences by depositing two synthetic resin members and to increasing connection strength of a plurality of pipes. <P>SOLUTION: A first depositing rib 18ab and a first depositing rib 18ba are connected with a first connection reinforcing member 30 in a first synthetic resin member 10. A second depositing rib 20ab and a second depositing rib 20ba are connected by a second connection reinforcing member 32 in a second synthetic resin member 14. Depositing parts 24ab, 24ba and inside burr hide ribs 26ab, 26ba are provided for the second depositing rib 20ab, 20ba and pipes 36a, 36b are formed by depositing the first synthetic resin member 10 and the first synthetic resin member 14. Burrs generated at the depositing parts 24ab, 24ba on depositing is confined by the inside burr hide ribs 26ab, 26ba, the first connection reinforcing member 30 and the second connection reinforcing member 32. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a connecting structure of synthetic resin pipes for connecting pipes to each other in which two synthetic resin members are welded to form a plurality of pipes.

  Intake manifolds that perform intake to the engine form a plurality of intake pipes having different shapes, and in recent years, resinization has been promoted in order to reduce the weight and cost. First, two divided synthetic resin members are manufactured, and then the two synthetic resin members are vibration welded to manufacture an intake manifold having a plurality of intake pipes.

  The state in which two synthetic resin members are vibration welded to form the intake manifold intake pipe will be described with reference to FIG. One first synthetic resin member 50 includes a plurality of first divided pipes 52 having a semi-elliptical cross section, for example. A pair of first welding ribs 54a and 54b extending from the free end to the outside are integrally formed at the free ends on both sides of the semi-elliptical shape of the first divided pipe 52. The other synthetic resin member 56 includes a plurality of second divided pipes 56 having a semi-elliptical cross section, for example. FIG. 4 is a cross-sectional view showing a state before the first synthetic resin member 50 and the synthetic resin member 56 are welded.

  A pair of second welding ribs 60a and 60b extending from the free end to the outside are integrally formed at the free ends on both sides of the semi-elliptical shape of the second divided pipe 58. The first weld rib 54a of the first split pipe 52 and the second weld rib 60a of the second split pipe 58 are arranged to face each other, and the first weld rib 54b of the first split pipe 52 and the second weld rib 60a of the second split pipe 58 are arranged. It arrange | positions so that the two welding ribs 60b may oppose. A surface of the first welding rib 54a facing the second welding rib 60a of the second divided tube 58 is defined as a welding surface 62a, and a surface of the first welding rib 54b facing the second welding rib 60b of the second divided tube 58 is welded. Let it be the surface 62b. On the opposed surfaces of the pair of first welding ribs 60a and 60b of the second divided pipe 58 in the pair of first welding ribs 54a and 54b, a melting portion 64a for melting at the center side position at the time of joining. 64b, inner burr concealing ribs 66a, 66b on the inner side (intake passage side), and outer burr concealing ribs 68a, 68b on the outer side are integrally formed in a direction protruding to the opposing surface side.

  The first welding ribs 54a and 54b of the first divided pipe 52 and the second welding ribs 60a and 60b of the second divided pipe 58 are arranged to face each other, move in a direction in which they are joined together, and with respect to the joining surface One of them is vibrated while applying a weight in the vertical direction. Due to the frictional heat generated by this vibration, the melted portion 64a of the second weld rib 60a is melted with the weld surface 62a of the first weld rib 54a, and the melted portion 64b of the second weld rib 60b is fused with the weld surface of the first weld rib 54b. Melts with 62b. As a result, the pair of first welding ribs 54 a and 54 b of the first divided pipe 52 and the pair of second welding ribs 60 a and 60 b of the second divided pipe 58 are welded. After the melted portions 64a and 64b are melted with the welding surfaces 62a and 62b, vibration is further applied, and the inner burr hidden portion 66a and the outer burr hidden portion 68a of the second weld rib 60a are attached to the weld surface 62a of the first weld rib 54a. In addition to welding, the inner burr hidden portion 66b and the outer burr hidden portion 68b of the second weld rib 60b are welded to the weld surface 62b of the first weld rib 54b. As a result, the intake manifold 70 shown in FIGS. 5 and 6 is formed.

  The intake manifold 70 shown in FIGS. 5 and 6 has, for example, three intake pipes 72a, 72b, 72c, and intake passages 74a, 74b, 74c inside the intake pipes 72a, 72b, 72c. One of the three intake pipes 72 a, 72 b, 72 c communicates with the surge tank 76 and the other communicates with the engine 78.

  Here, normally, at the time of welding, burrs, which are the remaining material portions of the melting portions 64a and 64b, are generated. If this burr exists inside the intake passages 74a, 74b, and 74c, not only will the air flow be disturbed, but if it falls during intake, it will cause various troubles such as failure of the intake device and engine. In addition, if there are burrs outside the intake pipes 72a, 72b, 72c, the intake manifold 70 may be damaged when being fixed or assembled in the engine room, or it may be trapped in other parts and the quality of those parts. Or invite a decline. For this reason, deburring work is required. Therefore, the inner burr hidden ribs 66a and 66b and the outer burr hidden ribs 68a and 68b are formed on the inner side and the outer side of the melting parts 64a and 64b, and the pair of first welding ribs 54a and 54b of the first divided pipe 52 are formed. When welding the pair of second welding ribs 60a and 60b of the second divided pipe 58, the inner burr hidden ribs 66a and 66b and the outer burr hidden ribs 68a and 68b cover the melting portions 64a and 64b, The outflow is prevented (for example, patent document 1).

  As shown in FIG. 6, in the intake manifold 70, due to the installation space and the like, the plurality of intake pipes 72a, 72b, 72c are not provided at the same height but are provided with steps at different heights. Is common. When such a step is provided, the intake pipes 72a, 72b, 72c are connected to each other by a reinforcing means 80 such as a reinforcing rib or a connecting arm in order to ensure the bonding strength and pressure resistance of the intake pipes 72a, 72b, 72c. To secure rigidity.

JP-A-2005-315199 (FIGS. 4 to 5)

  In order to ensure the strength and pressure resistance of each intake pipe 72a, 72b, 72c in the intake manifold 70 having a stepped shape in which the heights of the plurality of intake pipes 72a, 72b, 72c are different, conventionally, the intake pipes are connected to each other with reinforcing ribs, The connection is made by means of a reinforcing member 80 made of a rigid material such as a connecting arm. However, in the case of the conventional configuration, there are drawbacks such as an increase in the weight of the intake manifold 70 and an increase in installation space.

  The present invention has been made in view of the above problems, and in the case of manufacturing a plurality of pipes having steps by welding two synthetic resin members, burrs generated in the welded portion flow out into the passage or outside. It is an object of the present invention to provide a connecting structure for synthetic resin pipes that prevents the occurrence of the above problems and increases the strength of a plurality of pipes.

  The synthetic resin pipe connection structure of the present invention has a plurality of first divided pipes provided with first welding ribs on both sides, and the adjacent first welding ribs are connected by a first connection reinforcing member. A second synthetic resin member having a first synthetic resin member and a plurality of second divided pipes provided with second welding ribs on both sides, wherein the adjacent second welding ribs are connected by a second connection reinforcing member. A melted portion and an inner burr hidden rib on one of the first weld rib and the second weld rib, and the melted portion is melted so that the first weld rib and the second weld rib are provided. A pipe having a passage is formed by welding a rib, and the passage and the melted portion are blocked by the inner burr hidden rib. The present invention provides the first welded rib or the second welded rib provided with the melted part and the inner burr hidden rib, wherein the melted part is located at a position opposite to the inner burr hidden rib with the melted part as a center. It is characterized by not having a burr hidden rib for hiding a burr generated in the above. The present invention is characterized in that the adjacent pipes have a step.

  According to the connecting structure of the synthetic resin pipes according to the present invention, the first synthetic resin member in which the first welding ribs of the plurality of first divided pipes are connected by the first connecting reinforcing member, and the plurality of second divided pipes. A second synthetic resin member in which the second welding ribs are connected by a second connection reinforcing member is welded. Even when there is a step in the height of the adjacent first divided pipe and the height of the adjacent second divided pipe, the first connected reinforcing member and the second connected reinforcing member are adjacent to the first divided pipe or adjacent second divided pipes. The divided tubes can be connected to each other, and the strength of each tube after welding can be increased. Since the 1st connection reinforcement member and the 2nd connection reinforcement member connect adjacent welding rib with a level | step difference, the intensity | strength of an air pipe can be ensured, without taking installation space. Further, conventionally, a separate reinforcing member was required from the first synthetic resin member and the second synthetic resin member, but in the present invention, since a separate reinforcing member is not required, it is economical, and Also, the weight of the entire tube can be reduced. In the present invention, each melted portion is sealed by the burr accommodating space surrounded by the first connection reinforcing member and the second connection reinforcing member and the inner burr hidden rib, so that the melted portion is welded to the outside of the burr. Can be reliably prevented. Further, according to the present invention, the conventionally provided outer burr hidden rib can be omitted. That is, by sharing the conventionally used outer burr hidden rib and the connecting reinforcing member, it is possible to connect the tubes while suppressing an increase in the weight of the material, and to increase the strength of the tube.

  Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of a main part showing a connecting structure of synthetic resin pipes according to the present embodiment. FIG. 1 shows a state where two tubes are formed by vibration welding two synthetic resin members. One first synthetic resin member 10 includes, for example, a first divided tube 12a having a semi-elliptical cross section and a first divided tube 12b adjacent thereto. The other second synthetic resin member 14 includes, for example, a second divided pipe 16a having a semi-elliptical cross section and a first divided pipe 16b adjacent thereto. At the free ends on both sides of the semi-elliptical shape of the first divided tube 12a, there are two first weld ribs 18aa and first weld ribs 18ab extending outward from the free ends. The first divided pipe 12a is set to be arranged at the end of the plurality of first divided pipes. At the free ends on both sides of the semi-elliptical shape of the second divided pipe 16a, there are two second weld ribs 20aa and a first weld rib 20ab extending outward from the free ends. Since the 2nd division pipe 16a is welded with the 1st division pipe 12a, it will be arranged at the end among a plurality of 2nd division pipes.

  A first divided pipe 12b is arranged next to the first divided pipe 12a, and two first welding ribs are formed on the first divided pipe 12b. The first divided pipe 12a is located near the first divided pipe 12a. Let the welding rib be the 1st welding rib 18ba. A second divided pipe 16b is arranged next to the second divided pipe 16a, and two second welding ribs are also formed in the second divided pipe 16b, but the second divided pipe 16a is located near the second divided pipe 16a. Let the welding rib be the 2nd welding rib 20ba.

  The first welding rib 18aa of the first dividing pipe 12a and the second welding rib 20aa of the second dividing pipe 16a are arranged to face each other, and the first welding rib 18ab of the first dividing pipe 12a and the second welding rib 20aa of the second dividing pipe 16a are arranged. It arrange | positions so that the 2 welding rib 20ab may oppose. Further, the first welding rib 18ba of the first dividing pipe 12b and the second welding rib 20ba of the second dividing pipe 16b are arranged so as to face each other. A surface of the first weld rib 18aa facing the second welded rib 20aa of the second split tube 16a is a weld surface 22aa, and a surface of the first weld rib 18ab facing the second welded rib 20ab of the second split tube 16a is welded. A surface 22ab is defined as a welding surface 22ba which is a surface facing the second welding rib 20ba of the second divided pipe 16b in the first welding rib 18ba.

  On the surface facing the welding surface 22aa of the first welding rib 18aa of the first dividing tube 12a in the second welding rib 20aa located at the end of the second dividing tube 16a, a melting part for melting at the center side position at the time of joining 24aa, an inner burr hidden rib 26aa on the inner side (passage side), and an outer burr hidden rib 28aa on the outer side are integrally formed in a direction protruding to the welding surface 22aa side. That is, the second welding rib 20aa of the second divided pipe 16a located at the end includes an outer burr hidden rib 28aa for welding to the welding surface 22aa in addition to the melting part 24aa and the inner burr hidden rib 26aa. is there.

  A surface of the second weld rib 20ab of the second split pipe 16a not located at the end, which faces the weld surface 22ab of the first weld rib 18ab of the first split pipe 12a, has a melting portion 24ab for melting at the time of joining, An inner burr hidden rib 26ab is integrally formed in the direction protruding from the position of the melted portion 24ab toward the welding surface 22ab. That is, the second welding rib 20ab of the second divided pipe 16a not located at the end includes the melting portion 24ab and the inner burr hidden rib 26ab, but does not include the outer burr hidden rib.

  A surface of the second weld rib 20ba of the second split pipe 16b that is not located at the end is opposed to the weld surface 22ba of the first weld rib 18ba of the first split pipe 12b, and a melting portion 24ba for melting at the time of joining, An inner burr hidden rib 26ba is integrally formed on the passage side from the position of the melting portion 24ba so as to protrude toward the welding surface 22ba. The second welding rib 20ba of the second divided pipe 16b not located at the end includes the melting portion 24ba and the inner burr hidden rib 26ba, but does not include the outer burr hidden rib.

  The first welding rib 18ab not positioned at the end of the first divided pipe 12a and the first welding rib 18ba of the first divided pipe 12b are connected by a film-like first connection reinforcing member 30. The first connection reinforcing member 30 is formed integrally with the first divided tube 12a and the first divided tube 12b. Similarly, the adjacent first divided pipes (not shown) are connected by the film-like first connection reinforcing member 30. Moreover, the 2nd welding rib 20ab which is not located in the end of the 2nd division pipe 16a and the 2nd welding rib 20ba of the 2nd division pipe 16b are connected with the film-like 2nd connection reinforcement member 32. FIG. The second connection reinforcing member 32 is formed integrally with the second divided pipe 16a and the second divided pipe 16b. Similarly, the adjacent second divided pipes (not shown) are also connected by the film-like second connection reinforcing member 32.

  The first weld rib 18aa of the first split pipe 12a and the second weld rib 20aa of the second split pipe 16a are arranged to face each other, and the first weld rib 18ab of the first split pipe 12a and the second weld rib 20aa of the second split pipe 16a are arranged. The two welding ribs 20ab are arranged to face each other, the first welding ribs 18ba of the first divided pipe 12b and the second welding ribs 20ba of the second divided pipe 16b are arranged to face each other, and in a direction in which they are joined to each other. One of them is vibrated while moving and applying a weight in a direction perpendicular to the joint surface. Due to the frictional heat generated by this vibration, the melted portion 24aa of the second weld rib 20aa is melted with the weld surface 22aa of the first weld rib 18aa, and the melted portion 24ab of the second weld rib 20ab is fused with the weld surface of the first weld rib 18ab. The melted portion 24ba of the second weld rib 20ba is melted with the weld surface 22ba of the first weld rib 18ba. Thereby, the first welding rib 18aa of the first dividing pipe 12a and the second welding rib 20aa of the second dividing pipe 16a are welded, and the first welding rib 18ab of the first dividing pipe 12a and the second welding rib 20aa of the second dividing pipe 16a are welded. The two weld ribs 20ab are welded, and the first weld rib 18ba of the first split pipe 12b and the second weld rib 20ba of the second split pipe 16b are welded.

  After the melted portions 24a, 24b, and 24c are melted with the weld surfaces 22a, 22b, and 22c, further vibration is applied to weld the inner burr hidden portion 26aa of the second weld rib 20aa to the weld surface 22aa of the first weld rib 18aa. The inner burr hidden portion 26ab of the second weld rib 20ab is welded to the weld surface 22ab of the first weld rib 18ab, and the inner burr hidden portion 26ba of the second weld rib 20ba is welded to the weld surface 22ba of the first weld rib 18ba. Let The inner burr hidden portions 26aa, 26ab, 26ba are for preventing the burrs of the melted portions 24aa, 24ab, 24ba from protruding into passages 42aa, 42ab, 42ba, which will be described later. Specifically, the inner burr hidden portions 26aa, 26ab, 26ba block the melting portions 24aa, 24ab, 24ba and the passages 42aa, 42ab, 42ba.

  The first weld rib 18ba of the first split pipe 12b and the second weld rib 20ba of the second split pipe 16b are welded, and the first weld rib 18ba of the first split pipe 12b and the second weld rib of the second split pipe 16b. 20ba is welded. As described above, the first welding ribs 18aa, 18ab, 18ba of the first branch pipes 12a, 12b of the first synthetic resin member 10 and the second welding rib 20aa of the second branch pipes 16a, 16b of the second synthetic resin member 14 are provided. , 20ab, 20ba are welded to form the intake manifold 34 shown in FIGS. The intake manifold 34 includes a surge tank 36 and, for example, three pipes 40 a, 40 b, and 40 c that communicate with the surge tank 36 and communicate with the engine 38. Passages 42a, 42b, and 42c are formed inside the tubes 40a, 40b, and 40c, respectively. 2 and 3, the first welding rib other than the first welding rib 18ba in the tube 40b is defined as a first welding rib 18bc, and the two first welding ribs in the tube 40c are defined as first welding ribs 18cb and 18cc. To do.

  As described above, the first weld rib 18ab of the first split pipe 12a and the first weld rib 18ba of the first split pipe 12b are connected by the film-like first connection reinforcing member 30, and the second split pipe 16a is connected to the second split pipe 16a. The two welding ribs 20ab and the second welding rib 20ba of the second divided pipe 16b are connected by a film-like second connection reinforcing member 32. Therefore, in the intake manifold 34 formed by welding the first synthetic resin member 10 and the second synthetic resin member 14, the pipe 40a and the pipe 40b are connected to the film-like first connection reinforcing member 30 and the film-like second connection. The reinforcing member 32 is connected. Further, the first connection reinforcing member 30 and the second connection reinforcing member 32 are also connected between the pipe 40b and the pipe 40c.

  In the present invention, the conventionally existing outer burr hidden rib is omitted at the welded portion between the rib of the first divided pipe 12 and the rib of the second divided pipe 16 that is not the end. As a result, the first connection reinforcing member 30 that connects the first welding rib 18ab of the first dividing pipe 12a, the first welding rib 18ba of the first dividing pipe 12b, and the first welding rib 18ab and the first welding rib 18ba. A second weld rib 20ab of the second split pipe 16a, a second weld rib 20ba of the second split pipe 16b, and a second connection reinforcing member 32 that connects the second weld rib 20ab and the second weld rib 20ba. The burr accommodating space 44 is formed by the melting part 24ab and the melting part 24ba.

  When the first synthetic resin member 10 and the second synthetic resin member 14 are welded to produce the intake manifold 34, the melting portion 24ab and the inner burr hidden rib formed on the second welding rib 20ab of the second divided pipe 16a. 26ab is welded to the welding surface 22ab of the first welding rib 18ab of the first divided pipe 12a. Further, the melted portion 24ba and the inner burr hidden rib 26ba formed on the second welding rib 20ba of the second divided pipe 16b are welded to the welding surface 22ba of the first welding rib 18ba of the first divided pipe 12b. Here, there is a possibility that burrs may be generated from the melted portion 24ab of the second weld rib 20ab that is welded to the weld surface 22ab of the first weld rib 18ab, and further, the second weld that is welded to the weld surface 22ba of the first weld rib 18ba. There is a possibility that burrs may occur from the melted portion 24ba of the two welding ribs 20ba.

  When burrs are generated on both sides from the melted part 24ab on the tube 40b side in the tube 40a, the burrs on one side do not flow into the passage 42a by the inner burr hidden ribs 26ab. The burr on the other side remains in the burr accommodating space 44 and therefore does not flow out of the intake manifold 34. Similarly, when burrs are generated on both sides from the melted portion 24ab on the tube 40b side in the tube 40a, the burrs on one side do not flow into the passage 42b by the inner burr hidden ribs 26ba. The burr on the other side remains in the burr accommodating space 44 and therefore does not flow out of the intake manifold 34.

  In the above description, the second synthetic resin member 14 is provided with the melted portions 24aa, 24ab, 24ba and the inner burr hidden portions 26aa, 26ab, 26ba, but the melted portions 24aa, 24ab, 24ba and the inner burr hidden portions are provided. The portions 26aa, 26ab, and 26ba may be provided not on the second synthetic resin member 14 but on the first synthetic resin member 10. Further, the inner burr hidden portions 26aa, 26ab, 26ba are formed only on the second welding ribs 20aa, 20ab, 20ba forming the melting portions 24aa, 24ab, 24ba, but the first welding does not form the melting portions 24aa, 24ab, 24ba. The ribs 18aa, 18ab and 18ba may also be formed with inner burr hidden portions which are welded to the inner burr hidden portions 26aa, 26ab and 26ba and project toward the inner burr hidden portions 26aa, 26ab and 26ba. .

It is explanatory drawing which shows the welding state of the connection structure of the synthetic resin pipes which concern on a present Example. It is a top view showing the connection structure of the synthetic resin pipes which concern on this invention. It is AA sectional drawing of FIG. It is explanatory drawing which shows the welding state of the conventional intake manifold. It is a top view of the conventional intake manifold. It is BB sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 1st synthetic resin member 12a, 12b 1st division pipe 14 2nd synthetic resin member 16a, 16b 2nd division pipe 18aa, 18ab, 18ba 1st welding rib 20aa, 20ab, 20ba 2nd welding rib 22aa, 22ab, 22ba welding Surface 24aa, 24ab, 24ba Melting part 26aa, 26ab, 26ba Inner burr hidden part 30 First connection reinforcing member 32 Second connection reinforcing member 34 Intake manifold 40a, 40b, 40c Pipe 42a, 42b, 42c Passage 44 Burr accommodating space

Claims (3)

  A first synthetic resin member having a plurality of first split pipes provided with first weld ribs on both sides and connecting the adjacent first weld ribs with a first connection reinforcing member, and second welds on both sides A second synthetic resin member having a plurality of second divided pipes provided with ribs and connecting the adjacent second weld ribs with a second connection reinforcing member, wherein the first weld rib or the One of the second welding ribs is provided with a melting portion and an inner burr concealing rib, and the melting portion is melted to weld the first welding rib and the second welding rib to have a passage inside. And connecting the passage and the melted portion with the inner burr hidden rib.   In the first welding rib or the second welding rib provided with the melting portion and the inner burr hidden rib, a burr generated in the melting portion at a position opposite to the inner burr hidden rib with the melting portion as a center. 2. The synthetic resin pipe connection structure according to claim 1, wherein no burr concealing rib is provided for concealing.   3. The synthetic resin pipe connection structure according to claim 1, wherein the adjacent pipes have a step.

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