JP2017172514A - Intake manifold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake manifold capable of restraining deformation such as warpage caused by changes with time, and capable of securing a work space for maintenance without having interference with peripheral members in an engine room.SOLUTION: An intake manifold 1 of this invention is formed by welding a first resin molded member 11 and a second resin molded member 12, and includes a surge tank 2, and a plurality of intake pipes 3 having one end side connected with the surge tank and provided in parallel. A welding portion 13 of one of the first and the second resin molded members includes a welding rib 15, a burr hide rib 16 provided in a periphery of the welding portion so as to accumulate a weld burr with the welding rib, and a connection rib 17 for connecting the welding rib and the burr hide rib.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an intake manifold, and more particularly, to an intake manifold in which a first resin molded member and a second resin molded member are integrally formed by welding.

  As a conventional intake manifold, one having a surge tank and a plurality of intake pipes connected at one end to the surge tank and arranged in parallel is generally known (see, for example, Patent Documents 1 and 2). Patent Document 1 discloses an intake manifold in which a first resin molded member and a second resin molded member are integrally formed by vibration welding and formed in a snail shape as a whole. Further, Patent Document 2 discloses an intake manifold in which a PCV (Positive Crankcase Ventilation) passage for supplying blowby gas generated in an engine in each intake pipe is formed on the surface side of a plurality of intake pipes. . In this intake manifold, each of the plurality of intake pipes is formed with a flow hole that communicates the PCV passage and the inside of the intake pipe.

JP 2004-308506 A JP 2000-220536 A

  Here, since the intake manifold disclosed in Patent Document 1 has a complicated shape, it is necessary to suppress deformation such as warpage due to aging and to suppress a decrease in assembly accuracy with a counterpart part. The reinforcing rib 28 is set on the surface side of the intake manifold (see FIG. 6 of Patent Document 1). Further, in the intake manifold disclosed in Patent Document 2, there is a concern that the flow hole may be crushed at the time of welding. Therefore, it is considered to set a reinforcing rib at a position corresponding to the flow hole on the surface side of the intake manifold. It is done. However, in recent automobiles, it is difficult to secure space in the engine room, and it is difficult to set ribs on the surface side of the intake manifold. There are frequent cases where it is difficult to provide.

  The present invention has been made in view of the above-described present situation, and provides an intake manifold that can suppress deformation such as warping due to aging and can secure a work space for maintenance and the like without interference with peripheral members in the engine room. The purpose is to do. Furthermore, in addition to the above object, another object of the present invention is to provide an intake manifold capable of suppressing the collapse of the flow hole connected to the gas passage during welding.

In order to solve the above problem, the invention according to claim 1 is configured by welding a first resin molded member and a second resin molded member, and one end side is connected to the surge tank and the surge tank. A plurality of intake pipes arranged side by side, wherein the weld portion of one of the first resin molding member and the second resin molding member is a welding rib, The gist of the present invention is to include a burr hidden rib that is provided on the periphery of the welded portion and collects a weld burr with the weld rib, and a connecting rib that connects the weld rib and the burr hidden rib.
According to a second aspect of the present invention, in the first aspect of the invention, each of the plurality of intake pipes is formed in a spiral shape so as to surround the surge tank, and is disposed on the engine side of the plurality of intake pipes. A cavity extending in the direction in which the plurality of intake pipes are arranged is formed between each outlet portion to be connected and the surge tank, and the connecting rib is the burr concealment forming the welding rib and the cavity. The gist is that the rib is connected.
According to a third aspect of the present invention, in the first or second aspect of the present invention, a gas passage for supplying gas is formed on a surface side of the plurality of intake pipes, and the plurality of intake pipes Each of which is formed with a flow hole communicating with the gas passage and the inside of the intake pipe, and the connecting rib is connected to the flow hole in a portion surrounding the gas passage of the welded portion of the one resin molded member. The gist is that they are arranged at corresponding positions.
A fourth aspect of the present invention is the invention according to the third aspect, wherein the connecting rib is arranged so that positions of the plurality of intake pipes are aligned with the flow hole. And
The invention according to claim 5 is the invention according to claim 3 or 4, wherein the gas passage is a PCV passage for supplying blow-by gas generated in the engine.

According to the intake manifold of the present invention, the welded portion of one of the first resin molded member and the second resin molded member is provided between the weld rib and the weld rib at the periphery of the weld portion. A burr hidden rib for accumulating the weld burr and a connecting rib for connecting the weld rib and the burr hidden rib are provided. Thereby, since the rigidity in the vicinity of the welded portion is enhanced by the connecting rib, it is possible to suppress deformation such as warpage due to aging, and it is possible to suppress a decrease in assembly accuracy with the counterpart part. Further, since the connecting rib is provided in the welded portion, there is no interference with peripheral members in the engine room, and a work space for maintenance or the like can be secured.
Each of the plurality of intake pipes is formed in a spiral shape so as to surround the surge tank, and between each of the outlet portions connected to the engine side of the plurality of intake pipes and the surge tank, When a cavity is formed, and the connecting rib connects the welding rib and the burr hidden rib forming the cavity, the rigidity in the vicinity of the cavity is enhanced by the connecting rib, and therefore due to a change with time. Deformation such as warpage can be more effectively suppressed. Furthermore, a wide working space for maintenance and the like can be secured by using the cavity.
Further, a gas passage is formed on the surface side of the plurality of intake pipes, a flow hole is formed in each of the plurality of intake pipes, and the connection rib is welded to the one resin molded member When the portion surrounding the gas passage is disposed at a position corresponding to the flow hole, the rigidity of the vicinity of the gas passage and the flow hole is enhanced by the connecting rib, so that deformation such as warpage due to aging is further improved. It can be effectively suppressed. Furthermore, since the crushing of the flow holes connected to the gas passages during welding is suppressed, gas can be supplied to each intake pipe equally or at a target ratio.
Moreover, when the connection rib is arranged so that the positions of the plurality of intake pipes are aligned with the flow hole, the flow hole can be more effectively prevented from being crushed during welding.
Further, when the gas passage is a PCV passage for supplying blow-by gas generated in the engine, it is possible to suppress the crushing of the flow hole connected to the PCV passage at the time of welding.

The present invention will be further described in the following detailed description with reference to the drawings referred to, with reference to non-limiting examples of exemplary embodiments according to the present invention. Similar parts are shown throughout the several figures.
It is a perspective view of the intake manifold which concerns on an Example. It is a longitudinal cross-sectional view of the said intake manifold. It is a principal part enlarged view of FIG. 2, (a) shows the welding state of the 1st and 2nd resin molding member, (b) shows the butt | matching state of the 1st and 2nd resin molding member. It is the top view seen from the welding part side of the 1st resin molding member which concerns on an Example. It is a principal part enlarged view of FIG. It is the top view seen from the welding part side of the 2nd resin molding member which concerns on an Example. It is explanatory drawing for demonstrating the connection rib which concerns on another form, (a) shows the connection rib arrange | positioned by shifting the position of the row direction of a some intake pipe with respect to a flow hole, (b) is The connection rib arrange | positioned by connecting between a welding rib and an inner peripheral side burr | flash concealment rib is shown.

  The items shown here are exemplary and illustrative of the embodiments of the present invention, and are the most effective and easy-to-understand explanations of the principles and conceptual features of the present invention. It is stated for the purpose of providing what seems to be. In this respect, it is not intended to illustrate the structural details of the present invention beyond what is necessary for a fundamental understanding of the present invention. It will be clear to those skilled in the art how it is actually implemented.

<Intake manifold>
The intake manifold according to the present embodiment is configured by welding a first resin molded member (11) and a second resin molded member (12), and one end side is connected to the surge tank (2) and the surge tank. And an intake manifold (1) including a plurality of intake pipes (3) arranged side by side (see, for example, FIGS. 1 and 2). And the welding part (13) of one resin molding member of the 1st resin molding member (11) and the 2nd resin molding member (12) is provided in the periphery of the welding rib (15) and the welding part. A burr concealing rib (16) that accumulates welding burrs between the fusing ribs and a connecting rib (17) that couples the fusing ribs and the burr concealing ribs (see, for example, FIG. 4). There are no particular restrictions on the location, number, size, etc. of the connecting rib (17).

  As the intake manifold according to the present embodiment, for example, each of the plurality of intake pipes (3) is formed in a spiral shape so as to surround the surge tank (2), and is connected to the engine side of the plurality of intake pipes. A cavity (5) extending in the direction (P) in which a plurality of intake pipes are arranged is formed between each outlet portion (3a) and the surge tank (2), and the connecting rib (17) is welded. The form (For example, refer FIG.4 and FIG.7 (a) etc.) which connects the rib (15) and the burr | flash concealment rib (16) which forms a cavity (5) can be mentioned.

  As the intake manifold according to the present embodiment, for example, a gas passage (7) for supplying gas is formed on the surface side of the plurality of intake pipes (3). Has a flow hole (9) that communicates the gas passage and the inside of the intake pipe, and the connecting rib (17) is formed in a portion surrounding the gas passage (7) of the welded portion (13) of one resin molded member. The form (for example, refer FIG.4 and FIG.7 (a) (b) etc.) arrange | positioned in the position corresponding to a circulation hole (9) can be mentioned.

  In the case of the above-mentioned form, for example, the connecting rib (17) can be arranged so that the positions of the arrangement direction (P) of the plurality of intake pipes coincide with the flow hole (9) (for example, FIG. 4 and FIG. 7 (b) etc.).

  In the case of the above-described embodiment, for example, the gas passage can be a PCV passage (7) for supplying blow-by gas generated in the engine (see, for example, FIG. 4).

  In the case of the above-mentioned form, for example, in the portion surrounding the gas passage (7) of the welded portion (13) of the one resin molded member, the burr hidden rib (16) is arranged in parallel on the outer peripheral side of the welded rib (15). An outer peripheral burr hidden rib (16a) and an inner peripheral burr hidden rib (16b) arranged side by side on the inner peripheral side of the welding rib (15). The parallel spacing (L1) with the rib (15) is wider than the parallel spacing (L2) between the inner-side burr hidden rib (16b) and the welding rib (15), and the connecting rib (17) The welding rib (15) and the outer peripheral burr hidden rib (16a) can be connected (for example, see FIG. 5 and the like). Thereby, since a connection rib becomes elongate, the rigidity of a gas channel and the vicinity of a circulation hole is further effectively improved by a connection rib. Furthermore, since the accumulation volume of the welding burr between the welding rib and the outer peripheral side burr hidden rib is enlarged, it is possible to prevent the welding burr from protruding to the surface side.

  In addition, the code | symbol in the parenthesis of each structure described in the said embodiment shows the correspondence with the specific structure as described in the Example mentioned later.

  Hereinafter, the present invention will be specifically described with reference to the drawings. In this embodiment, as an “intake manifold” according to the present invention, an intake manifold used in an in-line three-cylinder internal combustion engine is illustrated.

(1) Configuration of Intake Manifold As shown in FIGS. 1 and 2, the intake manifold 1 according to this embodiment is integrally formed by welding a first resin molding member 11 and a second resin molding member 12. . The intake manifold 1 includes a surge tank 2 and a plurality of (three in the drawing) intake pipes 3 connected to the surge tank 2 at one end side.

  The surge tank 2 is a tank for temporarily storing air sent from the feed port 4. Further, each intake pipe 3 is formed in a spiral shape (specifically, substantially 9-letter shape) so as to surround the surge tank 2. Further, each outlet portion 3 a connected to the engine side (not shown) of each intake pipe 3 extends away from the surge tank 2. Between each outlet portion 3a and the surge tank 2, a cavity 5 extending in the direction P in which the plurality of intake pipes 3 are arranged is formed. The cavity 5 is used as a work space when the flange 23 on one end side of the outlet portion 3a of each intake pipe 3 is fastened to the engine side.

  On the surface side of the plurality of intake pipes 3 (specifically, the curved inner surface side downstream of each intake pipe 3), a PCV (Positive Positive) for supplying blow-by gas generated in the engine into each intake pipe 3 is provided. Crankcase Ventilation) passage 7 (illustrated as “gas passage” according to the present invention) is formed. The PCV passage 7 extends along the arrangement direction P of the intake pipes 3 at a position adjacent to the surge tank 2. Further, an inflow pipe 8 connected to an engine crankcase (not shown), a cylinder head cover, and the like is connected to one end side of the PCV passage 7. Further, each intake pipe 3 is formed with a through hole 9 that allows the PCV passage 7 and the intake pipe 3 to communicate with each other.

  As shown in FIGS. 2 and 4, the first resin molding member 11 forms approximately half of the surge tank 2, forms the downstream side of each intake pipe 3, and further approximately half of the PCV passage 7. Is forming. A cover member 28 that forms the curved outer side of the downstream side of the intake pipe 3 is welded to the first resin molding member 11. A first welded portion 13 is formed on the butt end side of the first resin molded member 11 with respect to the second resin molded member 12. Further, the first resin molding member 11 is formed with a plurality of (three in FIG. 4) flow holes 9 in the partition wall 11 a that partitions the PCV passage 7 and each intake pipe 3.

  As shown in FIG. 4, the first welded portion 13 is formed in a circumferential shape surrounding the portions of the first resin molded member 11 that form the surge tank 2, the intake pipe 3, and the PCV passage 7. The first welding portion 13 includes a welding rib 15, a burr hidden rib 16 provided on the periphery of the first welded portion 13 to collect a welding burr between the welding rib 15, a welding rib 15, and a burr hidden rib 16. And a plurality (three in FIG. 4) of connecting ribs 17 that connect both the members 15 and 16. As shown in FIG. 3, each of the welding ribs 15, the burr hidden ribs 16, and the connecting ribs 17 protrudes in the butting direction Q of the first and second resin molding members 11 and 12. Further, the burr hidden ribs 16 are arranged side by side apart from the side of the welding rib 15. Between the welding rib 15 and the burr hidden rib 16, a burr reservoir portion 19 is formed for accumulating the welding burr B generated at the time of welding. In addition,

  Here, as shown in FIGS. 3 and 5, the burr hidden ribs 16 are arranged on the outer circumferential side of the weld rib 15 in the portion surrounding the PCV passage 7 of the first weld portion 13. 16a and inner side burr hidden ribs 16b arranged in parallel on the inner side of the welding rib 15. The parallel arrangement interval L1 between the outer peripheral side burr hidden rib 16a and the welding rib 15 forming the cavity 5 is wider than the parallel arrangement interval L2 between the inner peripheral side burr hidden rib 16b and the welding rib 15.

  As shown in FIGS. 4 and 5, each of the connecting ribs 17 connects the welding rib 15 and the outer peripheral burr hidden rib 16 a that forms the cavity 5. Further, each connecting rib 17 is disposed at a position corresponding to the flow hole 9 in a portion surrounding the PCV passage 7 of the first welding portion 13. Specifically, the connecting ribs 17 are arranged such that the positions of the plurality of intake pipes 3 in the arrangement direction P coincide with the flow holes 9.

  As shown in FIGS. 2 and 6, the second resin molding member 12 forms approximately half of the surge tank 2, forms the upstream side of each intake pipe 3, and further approximately half of the PCV passage 7. Is forming. A cover member 29 that forms the curved outer side on the upstream side of the intake pipe 3 is welded to the second resin molding member 12. Furthermore, a second welded portion 14 is formed on the butt end side of the second resin molded member 12 with respect to the first resin molded member 11. The second welded portion 14 is formed in a circumferential shape that surrounds the portions of the second resin molding member 12 that form the surge tank 2, the intake pipe 3, and the PCV passage 7. Furthermore, the 2nd welding part 14 is equipped with the welding rib 21 which protrudes in the butt | matching direction Q of the 1st and 2nd resin molding members 11 and 12 (refer FIG. 3).

(2) Manufacturing method of intake manifold Next, the manufacturing method of the intake manifold 1 of the said structure is demonstrated. First, the 1st resin molding member 11 to which the cover member 28 was joined by vibration welding, and the 2nd resin molding member 12 to which the cover member 29 was joined by vibration welding are prepared. And the 1st welding part 13 of these 1st resin molding members 11 and the 2nd welding part 14 of the 2nd resin molding member 12 are faced | matched (refer FIG.3 (b)). After that, the intake manifold 1 is obtained by pressurizing and vibrating both the parts 13 and 14 in close contact with each other. At the time of this vibration welding, the first welding portion 13 accumulates welding burrs generated at the time of welding in the burr reservoir portion 19 (see FIG. 3A). In addition, each of the 1st and 2nd resin molding members 11 and 12 is comprised by shape | molding the part adjacent to the cavity 5 with a slide type | mold.

  Here, in the intake manifold 1 having the above-described configuration, as shown in FIG. 3A, blow-by gas G generated in the engine when the engine is operating is sent to the PCV passage 7 and passes through each flow hole 9 to each intake pipe 3. The air A is fed into the intake pipe 3 from the surge tank 2 and recirculated to the intake side of the engine for combustion.

(3) Effect of Example According to the intake manifold 1 of this example, the first welded portion 13 of the first resin molded member 11 is provided on the weld rib 15 and the peripheral edge of the first welded portion 13, and the welded rib 15. And burr concealing ribs 16 for accumulating welding burrs, and connecting ribs 17 connecting the fusing ribs 15 and the burr concealing ribs 16. Thereby, since the rigidity of the vicinity of the 1st welding part 13 is improved by the connection rib 17, deformation | transformation, such as a curvature by a time-dependent change, can be suppressed, and the fall of the assembly | attachment precision with a counterpart component can be suppressed. Further, since the connecting rib 17 is provided in the first welded portion 13, there is no interference with the peripheral members in the engine room, and a work space for maintenance and the like can be secured. Further, the connection rib 17 can be easily set without being influenced by the structure of the molding die of the first resin molding member 11, and the accumulation volume of the welding burr can be set wide.

  In the present embodiment, each of the plurality of intake pipes 3 is formed in a spiral shape so as to surround the surge tank 2, and each outlet portion 3 a connected to the engine side of the plurality of intake pipes 3 and the surge tank 2, the cavity 5 is formed, and the connecting rib 17 connects the welding rib 15 and the burr hidden rib 16 that forms the cavity 5. Thereby, since the rigidity in the vicinity of the cavity 5 is enhanced by the connecting rib 17, it is possible to more effectively suppress deformation such as warpage due to aging. Furthermore, by using the cavity 5, a wide work space for maintenance and the like can be secured.

  In the present embodiment, the PCV passage 7 is formed on the surface side of the plurality of intake pipes 3, the flow holes 9 are formed in each of the plurality of intake pipes 3, and the connecting ribs 17 are In the portion surrounding the gas passage 7 of the first welding part 13, it is arranged at a position corresponding to the flow hole 9. Thereby, since the rigidity in the vicinity of the PCV passage 7 and the flow hole 9 is enhanced by the connecting rib 17, it is possible to more effectively suppress deformation such as warpage due to aging. Furthermore, since the crushing of the flow hole 9 connected to the PCV passage 7 is suppressed at the time of welding, blow-by gas can be evenly supplied to the intake pipes 3.

  In the present embodiment, the connecting rib 17 is arranged so that the positions of the plurality of intake pipes 3 in the arrangement direction P coincide with the flow hole 9. Thereby, collapse of the flow hole 9 at the time of welding can be suppressed more effectively.

  Further, in the present embodiment, the burr hidden rib 16 is disposed on the outer peripheral side of the weld rib 15 in the portion surrounding the PCV passage 7 of the first weld portion 13 and the weld rib 15. An inner peripheral side burr hidden rib 16b arranged in parallel on the inner peripheral side, and a parallel arrangement interval L1 between the outer peripheral side burr hidden rib 16a and the weld rib 15 is equal to the inner peripheral burr hidden rib 16b and the weld rib 15; The connecting rib 17 connects the welding rib 15 and the outer-side burr hidden rib 16a. Thereby, since the connecting rib 17 becomes long, the rigidity in the vicinity of the PCV passage 7 and the flow hole 9 is further effectively enhanced by the connecting rib 17. Furthermore, since the accumulation volume of the welding burr between the welding rib 15 and the outer peripheral side burr hidden rib 16a is enlarged, it is possible to prevent the welding burr from protruding to the surface side.

  In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the said Example, although the form provided with the connection rib 17 in the 1st welding part 13 of the 1st resin molding member 11 was illustrated, it is not limited to this, For example, the 2nd welding part of the 2nd resin molding member 12 14 may include a connecting rib 17.

  Moreover, in the said Example, although the form which arrange | positions the connection rib 17 in the vicinity of the flow hole 9 was illustrated so that the position of the arrangement direction P of the some intake pipe 3 may correspond with respect to the flow hole 9, it is limited to this. For example, as shown in FIG. 7A, the connecting ribs 17 are arranged in the vicinity of the circulation holes 9 by shifting the positions of the plurality of intake pipes 3 in the arrangement direction P with respect to the circulation holes 9. Also good.

  Moreover, in the said Example, although the form which connected the welding rib 15 and the outer peripheral side burr | flash concealment rib 16a with the connection rib 17 was illustrated, it is not limited to this, For example, as shown in FIG.7 (b), welding is carried out. The rib 15 and the inner peripheral side burr hidden rib 16 b may be connected by a connecting rib 17.

  In the above embodiment, the PCV passage 7 for supplying blow-by gas into each intake pipe 3 is illustrated as the gas passage. However, the present invention is not limited to this, and for example, a gas for supplying exhaust gas into each intake pipe 3. A passage or a gas passage for supplying fuel vapor into each intake pipe 3 may be used. Further, different types of gas passages may be provided in parallel.

  Furthermore, in the said Example, although vibration welding was illustrated as a joining method of the 1st and 2nd resin molding members 11 and 12, it is not limited to this, For example, laser welding, ultrasonic welding, thermal welding, induction welding, etc. May be adopted.

  The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. Although the invention has been described with reference to exemplary embodiments, it is to be understood that the language used in the description and illustration of the invention is illustrative and exemplary rather than limiting. As detailed herein, changes may be made in its form within the scope of the appended claims without departing from the scope or spirit of the invention. Although specific structures, materials and examples have been referred to in the detailed description of the invention herein, it is not intended to limit the invention to the disclosure herein, but rather, the invention is claimed. It covers all functionally equivalent structures, methods and uses within the scope.

  The present invention is not limited to the embodiments described in detail above, and various modifications or changes can be made within the scope of the claims of the present invention.

  It is widely used as a technique related to an intake manifold that guides intake air to an intake port of an internal combustion engine used in vehicles such as passenger cars, buses, and trucks.

  DESCRIPTION OF SYMBOLS 1; Intake manifold, 2; Surge tank, 3; Intake pipe, 7; PCV channel | path, 9; Flow hole, 11; 1st resin molding member, 12: 2nd resin molding member, 13; Welding rib, 16; burr hidden rib, 17; connecting rib, P;

Claims (5)

An intake manifold is formed by welding a first resin molded member and a second resin molded member, and includes a surge tank and a plurality of intake pipes connected at one end to the surge tank and arranged in parallel. And
The welded portion of one of the first resin molded member and the second resin molded member is provided on the periphery of the weld rib and the weld rib, and collects weld burrs between the weld rib. An intake manifold, comprising: a burr hidden rib; and a connecting rib that couples the weld rib and the burr hidden rib. Each of the plurality of intake pipes is formed in a spiral shape so as to surround the surge tank,
Between each outlet portion connected to the engine side of the plurality of intake pipes and the surge tank, a cavity extending in the arrangement direction of the plurality of intake pipes is formed,
The intake manifold according to claim 1, wherein the connection rib connects the welding rib and the burr hidden rib forming the cavity. A gas passage for supplying gas is formed on the surface side of the plurality of intake pipes,
Each of the plurality of intake pipes is formed with a flow hole communicating the gas passage and the inside of the intake pipe.
The intake manifold according to claim 1 or 2, wherein the connecting rib is disposed at a position corresponding to the flow hole in a portion surrounding the gas passage of the welded portion of the one resin molded member.   The intake manifold according to claim 3, wherein the connection rib is arranged so that positions of the plurality of intake pipes in alignment with the flow hole coincide with each other.   The intake manifold according to claim 3 or 4, wherein the gas passage is a PCV passage for supplying blow-by gas generated in an engine.

Images