JP6013085B2 - Resin intake manifold - Google Patents

Description

  The present invention relates to a resin intake manifold for a multi-cylinder engine.

  Conventionally, as disclosed in, for example, Patent Document 1, it is known that an intake manifold having a plurality of intake passages connected to each intake port of an in-line multi-cylinder engine is molded from resin.

  A resin intake manifold 100 of Patent Document 1 is mounted on an in-line four-cylinder engine in which four cylinders are arranged in a straight line, and a cylindrical throttle body mounting portion 130 to which a throttle body having a throttle valve is mounted, and the throttle A surge tank 150 that communicates with the inside of the body mounting portion 130 and four independent intake passages 170 that communicate with the surge tank 150 and communicate with the intake ports of the respective cylinders are integrally configured.

  FIG. 10 shows a longitudinal sectional view of the intake manifold 100. The surge tank 150 is disposed at a substantially central portion in the vertical direction of the intake manifold 100, and a throttle body mounting portion 130 is disposed above the surge tank 150. The four intake passages 170 are arranged side by side in the cylinder row direction of the engine, and are wound around the surge tank 150 when viewed from the cylinder row direction. Specifically, the upstream end of each intake passage 170 opens to the lower wall inner surface 150a of the surge tank 150, and the upstream side of each intake passage 170 passes through the lower side of the surge tank 150 and moves downward toward the anti-engine side (right side in FIG. 10). Curved and extended. Furthermore, the downstream side of the intake passage 170 extends in a curved shape toward the engine side after extending in a curved shape on the side opposite to the engine side of the surge tank 150.

  The resin intake manifold 100 includes an engine side manifold constituting member 111 located on the engine side, an anti-engine side manifold constituting member 113 located on the opposite side of the engine side manifold constituting member 111, and these engine side manifold constituting members. 111 and an intermediate manifold constituting member 115 located between the non-engine side manifold constituting member 113. All the constituent members are injection molded products.

  The intermediate manifold constituting member 115 is formed with a surge tank constituting portion 115 a constituting the anti-engine side of the surge tank 150. The surge tank component 115a is open to the engine side when viewed from the cylinder row direction of the engine, and the upper wall inner surface 150b of the surge tank 150 extends flatly after being inclined upward toward the engine side, while the lower wall The inner surface 150a is inclined downward toward the engine side. When the intermediate manifold component 115 is molded, molten resin is injected and filled into a cavity formed between the fixed die and the movable die provided with a convex portion corresponding to the surge tank component 115a. After the molten resin is cooled and solidified to form an injection molded product, the movable mold is retracted in the direction of the white arrow in FIG. 10, and then the injection molded product is demolded.

Japanese Patent No. 4328693 (pages 5-6, FIG. 5)

  By the way, depending on the type of engine, etc., there is a demand for compactness while arbitrarily setting the capacity of the surge tank and the capacity and length of the intake passage. In order to satisfy this requirement, the angle of wrapping around the surge tank in each intake passage (hereinafter referred to as “winding angle”), as viewed from the cylinder row direction of the engine, while devising the shape of the surge tank, is more than 270 °. You may need to increase it.

  When the winding angle is made larger than 270 ° in the resin intake manifold 100, since the position of the intake port of the engine to which the downstream end of the intake passage 170 is connected is determined, the downstream end cannot be extended. Therefore, the upstream end of the intake passage 170 must be extended upward.

  In order to extend the upstream end of the intake passage 170, for example, the end portion of the lower wall inner surface 150a on the intake passage 170 side is curved upward, so that the engine-side manifold constituent member 111 and the intermediate manifold constituent member 115 can It is conceivable to form an extension. However, if the lower wall inner surface 150a is curved upward, the surge tank constituting portion 115a has an undercut shape, and there is a problem that it takes time to manufacture the intermediate manifold constituting member 115.

  Further, instead of extending the upstream end of the intake passage 170 with both the above-described constituent members 111 and 115, it is also conceivable to provide another cylindrical member facing the surge tank 150 from this upstream end. However, when a separate member is provided, there are problems that the number of parts increases, manufacturing takes time and manufacturing cost increases.

  The present invention has been made in view of the above points, and the object of the present invention is to reduce the number of components and to avoid the undercut shape of the surge tank constituent part of the intermediate manifold constituent member. Is to provide a simple resin intake manifold.

  In order to achieve the above object, the present invention devises the structure of the parts constituting the surge tank and the intake passage in the engine side manifold constituent member and the intermediate manifold constituent member.

  Specifically, in the present invention, a throttle body attaching portion to which a throttle body is attached, a surge tank, and an intake passage communicating with an intake port of a multi-cylinder engine are arranged and connected in order toward the downstream side in the intake flow direction. The multi-cylinder formed such that the upstream side of the intake passage extends from the lower side of the surge tank to the anti-engine side, and the downstream side extends in a curved shape upward from the anti-engine side of the surge tank and then extends to the engine side. The following solution was taken for the engine plastic intake manifold.

According to a first aspect of the present invention, an intake manifold includes an engine-side manifold constituent member located on the engine side, an anti-engine-side manifold constituent member located on the anti-engine side of the engine-side manifold constituent member, the engine-side manifold constituent member, It has the structure divided | segmented into the intermediate manifold structural member located between anti- engine side manifold structural members . The upstream side of the intake passage and the surge tank are constituted by the engine side manifold constituent member and the intermediate manifold constituent member . The downstream end of the intake passage is located above the surge tank and on the engine side, and is configured by the engine-side manifold constituent member. The engine-side wall inner surface at the upstream end of the intake passage of the engine-side manifold component member is inclined upward toward the non-engine side . The intermediate manifold components are integrally molded product, the anti-engine side of the interior wall surface of the intake passage upstream facing wall inner surface of the engine side and at the end of the intermediate manifold components are inclined upward toward the opposite side to the engine And connected to the inner surface of the lower wall of the surge tank. The inner surface of the lower wall of the surge tank is formed in a concave shape in the longitudinal section that is released toward the downstream end side of the intake passage. Both side surfaces of the lower wall inner surface on the engine side and the non-engine side extend in a direction away from each other toward the opening from the bottom surface of the lower wall inner surface. Of the both side surfaces of the inner surface of the lower wall, the engine side surface is an inclined surface that is inclined downward toward the opposite engine side. Interior wall surface on facing the lower wall inner surface of the surge tank in the intermediate manifold component is inclined downwardly toward the opposite side to the engine with greater gradient than parallel or the inclined surface and the inclined surface. In the first aspect of the invention, the dividing surface of the engine-side manifold component and the intermediate manifold component corresponds to the opening of the lower wall inner surface of the surge tank, and corresponds to the lower wall inner surface of the surge tank. It is characterized in that it is inclined upward toward the non-engine side at a position where

The second invention is the resin intake manifold of the first invention, and wherein the angle formed between the passageway central axis of the upstream opening and the downstream end of the intake passage is greater than 90 ° than 0 ° To do.

According to a third invention, in the resin intake manifold of the first or second invention, a plurality of the intake passages are provided side by side in one direction. The third invention is characterized in that the throttle body mounting portion and an intake inlet of a surge tank communicating with the throttle body mounting portion are formed between the adjacent intake passages.

According to a fourth aspect of the present invention, in the resin intake manifold of the third aspect, the throttle body mounting portion extends from the intake inlet toward the side opposite to the engine and is bent upward. .

According to a fifth aspect of the present invention, in the resin intake manifold of the third or fourth aspect, the intake inlet is positioned below the upstream end of the intake passage.

According to the first aspect, the upstream side of the intake passage is constituted by the engine side manifold constituting member and the intermediate manifold constituting member. Among these, the engine-side manifold constituent member is formed with an engine-side wall inner surface at the upstream end of the intake passage, and the intermediate manifold constituent member is formed with an anti-engine-side wall inner surface facing the engine-side wall inner surface, The inner surface of the wall on the opposite engine side is inclined upward toward the opposite engine side. Furthermore, the intermediate manifold components, the lower wall inner surface of the surge tank is formed in the longitudinal sectional concave shape, the surge tank lower wall inner surface have led opposite side to the engine of the wall inner surface of the, the lower wall inner surface Both side surfaces of the engine extend in a direction away from the bottom toward the opening, and the side surface on the engine side is an inclined surface inclined downward toward the opposite engine side. Therefore, the upstream end of the intake passage can be extended to the surge tank side. Therefore, the winding angle of the intake passage can be set to 270 ° or more. Thereby, the upstream end of the intake passage can be extended without providing a separate member at the upstream end of the intake passage.

  Further, in the intermediate manifold component, the inner surface of the upper wall and the lower wall of the surge tank are formed so as to be parallel to each other or close to each other toward the opposite engine side. The part corresponding to the surge tank on the dividing surface is inclined upward toward the non-engine side. If it does so, the part which comprises a surge tank will not become an undercut shape seeing from the direction which inclines upwards as it goes to an engine side. Therefore, by preparing a slide mold having a shape corresponding to the portion constituting the surge tank and sliding the slide mold obliquely upward at the time of injection molding, the intermediate manifold constituting member can be easily manufactured.

  According to the second invention, it is possible to form an intake passage having a winding angle larger than 270 ° and smaller than 360 °. Therefore, a compact resin intake manifold can be obtained.

It is the whole perspective view which looked at the resin intake manifold concerning the embodiment of the present invention from the non-engine side. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1. It is a whole perspective view of an engine side manifold component. It is a whole perspective view of an intermediate manifold constituent member. It is a whole perspective view of a non-engine side manifold constituent member. It is the figure which showed typically the shaping | molding die of an intermediate manifold structural member. It is a disassembled perspective view of a resin intake manifold. It is sectional drawing which shows the process of welding an engine side manifold structural member to an intermediate manifold structural member. It is sectional drawing which shows the process of welding an anti- engine side manifold structural member to the assembly of an engine side manifold structural member and an intermediate manifold structural member. It is sectional drawing which shows the conventional resin intake manifold.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

FIG. 1 is a perspective view showing an entire resin intake manifold 1 of a multi-cylinder engine according to an embodiment of the present invention. 2 is a cross-sectional view taken along the line II-II in FIG. The intake manifold 1 is mounted on an in-line four-cylinder engine E in which four cylinders are arranged in a straight line. The intake manifold 1 includes a cylindrical throttle body mounting portion 3 to which a throttle body (not shown) having a throttle valve is attached, a surge tank 5 communicating with the inside of the throttle body mounting portion 3, and a communication with the surge tank 5. Thus, the engine E is integrally formed with four independent intake passages 7 communicated with intake ports (not shown) of the respective cylinders of the engine E.

  The surge tank 5 is arranged on the upper side of the intake manifold 1 in the vertical center, and the throttle body mounting portion 3 is arranged on the anti-engine E side of the surge tank 5. The four intake passages 7 are arranged side by side in the cylinder row direction of the engine E. When viewed from the cylinder row direction, the angle θ formed by the upstream opening 7a of each intake passage 7 and the passage center shaft 7b at the downstream end is larger than 0 ° and smaller than 90 °. That is, since the winding angle at which each intake passage 7 is wound around the surge tank 5 is larger than 270 ° and smaller than 360 °, the intake manifold 1 can be made compact. The winding angle is preferably larger than 10 °, smaller than 80 °, more preferably larger than 20 °, smaller than 70 °.

  As shown in FIG. 2, the upstream end of each intake passage 7 opens into the lower wall inner surface 5 a of the surge tank 5, and the upstream side of the intake passage 7 passes below the surge tank 5 toward the anti-engine E side. It curves and extends downward. Further, the downstream side of the intake passage 7 extends in a curved shape toward the engine E side after extending the anti-engine E side of the surge tank 5 upward in a curved shape. The upstream side of the intake passage 7 is adjacent to each other, while the downstream side is arranged away from each other in correspondence with the interval of the cylinders of the engine E.

  At the downstream end of the intake passage 7, a flange 9 is provided as an attachment portion fastened to the side surface of the engine E, and the intake manifold 1 is attached to the engine E by this flange 9. The intake manifold 1 attached to the engine E flows into the surge tank 5 through the throttle body mounting portion 3 and the intake air flowing into the surge tank 5 flows into the intake passages 7. The flow is divided and supplied to each intake port of the engine E.

  As shown in FIG. 2 and the like, the intake manifold 1 includes an engine side manifold constituting member 11 located on the engine E side, and an anti-engine side manifold constituting member 13 located on the anti-engine E side of the engine side manifold constituting member 11. And an intermediate manifold constituting member 15 located between the engine side manifold constituting member 11 and the anti-engine side manifold constituting member 13. These manifold constituent members 11, 13, and 15 are resin injection molded products.

  3 to 5 are perspective views showing the manifold constituent member, FIG. 3 shows the engine side manifold constituent member 11, FIG. 4 shows the intermediate manifold constituent member 15, and FIG. 5 shows the anti-engine side manifold constituent member 13. Show.

  As shown in FIG. 3, the engine side manifold constituting member 11 includes the flange 9, four downstream end constituting portions 11 a constituting the vicinity of the downstream end of the intake passage 7, and the engine E side of the surge tank 5. The first tank constituting portion 11b constituting and the four first passage constituting portions 11c constituting the lower portion on the upstream side of the intake passage 7 are integrally formed. The flange 9 is formed in a thick plate shape extending in the vertical direction along the side surface of the engine E, and a plurality of insertion holes 9a through which fastening members (not shown) are inserted are formed on the periphery.

  The downstream end constituting portion 11a is formed in a generally rectangular tube shape that protrudes from the flange 9 toward the anti-engine E side, and is arranged at intervals in the direction in which the intake passages 7 are arranged. The intake passage 7 inside the downstream end constituting portion 11a communicates with an intake port (not shown) of the engine E. A welding surface 11d to be vibration welded to the intermediate manifold constituting member 15 is formed at the end of the downstream end constituting portion 11a on the side opposite to the engine E.

  The first tank constituting portion 11b is formed so as to bulge to the engine E side from the flange 9. The longitudinal section of the first tank component 11b has a substantially trapezoidal shape that opens to the anti-engine E side. Further, the cross section of the first tank constituting portion 11b is formed in a substantially C shape that opens to the anti-engine E side, and has a rectangular bowl shape as a whole. At the periphery of the first tank constituting portion 11b, a welding surface 11e is formed which is continuous with the welding surface 11d and on which the intermediate manifold constituting member 15 is vibration welded.

  Each said 1st channel | path structure part 11c is following the lower part of the 1st tank structure part 11b, and is formed in the recessed part extended in the engine E side from the upper part to the downward direction. Therefore, as shown in FIG. 2, the longitudinal cross section of the engine side manifold constituting member 11 is substantially C-shaped by the first tank constituting portion 11b and the first passage constituting portion 11c. As shown in FIG. 2, a wall inner surface 11f on the engine E side that inclines upward toward the anti-engine E side is formed in a portion corresponding to the upstream end of the intake passage 7 of the first passage constituting portion 11c. Yes. The first passage constituting portion 11c is adjacent to the direction in which the intake passages 7 are arranged, and the lower portion of the engine side manifold constituting member 11 has a wave shape as a whole. As shown in FIG. 3, a weld surface 11g that is vibration welded to the intermediate manifold component 15 is formed on the upper edge of the first passage component 11c and the edge on the anti-engine E side. The welding surface 11g at the upper edge of the portion 11c is continuous with the welding surface 11e.

  As shown in FIGS. 2 and 4, the intermediate manifold constituting member 15 includes a second tank constituting portion 15 a that constitutes the anti-engine E side of the surge tank 5, and each intake passage 7 extends as shown in FIG. 4. And four curved portions 15b that are curved in the direction. As shown in FIG. 2, the longitudinal section of the second tank component 15a has a substantially U-shape that opens to the engine E side so as to correspond to the first tank component 11b. Further, the cross section of the second tank constituting portion 15a is also substantially U-shaped to open to the engine E side. The lower wall inner surface 5a of the second tank component 15a is inclined downward toward the anti-engine E side. An upper wall inner surface 5b facing the lower wall inner surface 5a is parallel to the lower wall inner surface 5a. Further, as shown in FIG. 2, the end surface 15 c on the engine E side of the second tank constituting portion 15 a corresponds to the surge tank 5 on the dividing surface 17 between the engine side manifold constituting member 11 and the intermediate manifold constituting member 15. This end surface 15c is inclined upward toward the anti-engine E side. And the welding surface 15d (refer FIG. 4) welded to the welding surface 11e of the said 1st tank structure part 11b periphery is formed in the periphery of this 2nd tank structure part 15a. An exhaust passage attachment portion 15e to which an exhaust passage (not shown) for returning a part of the exhaust from the engine E to the surge tank 5 is attached to the side wall on the one side in the arrangement direction of the intake passage 7 of the second tank constituting portion 15a. Is provided.

  The curved portion 15b has a plate shape in which the lower portion corresponding to the upstream side of the intake passage 7 is spaced downward from the lower wall of the second tank constituting portion 15a, and the upper portion corresponding to the downstream side constitutes the second tank. It is integrally formed on the upper wall of the portion 15a. Therefore, spaces R1, R2, R3, and R4 are formed in order from the engine E side to the counter-engine E side between the curved portion 15b and the lower wall of the second tank constituting portion 15a.

  A lower annular portion 15f constituting a part of the intake passage 7 is integrally formed on the upstream side of the intake passage 7 of each curved portion 15b so as to protrude downward. A portion on the upstream side of the intake passage 7 with respect to the lower annular portion 15f of each curved portion 15b is a second passage constituting portion 15g (see FIG. 4). The second passage constituting portion 15g is the engine side manifold constituting member 11 described above. The first passage constituting portion 11c is superposed on the upper side of the intake passage 7 together with the first passage constituting portion 11c. As shown in FIG. 2, a wall inner surface 15h on the anti-engine E side upstream of the intake passage 7 is formed in the second passage constituting portion 15g. The wall inner surface 15h on the anti-engine E side is inclined upward toward the anti-engine E side and is connected to the lower wall inner surface 5a of the surge tank 5, and the engine E side of the first passage constituting portion 11c. It faces the wall inner surface 11f. In addition, the welding surface 15i welded to the welding surface 11g of the 1st channel | path structure part 11c is formed in the periphery of the 2nd channel | path structure part 15g.

  Thus, the upstream side of the intake passage 7 is constituted by the engine side manifold constituting member 11 and the intermediate manifold constituting member 15. Among them, the engine side manifold constituting member 11 is formed with an engine E side wall inner surface 11f upstream of the intake passage 7, and the intermediate manifold constituting member 15 is opposed to the engine E side wall inner surface 11f. A side wall inner surface 15h is formed. The wall inner surface 15h on the anti-engine E side is inclined upward toward the anti-engine E side as described above. Further, the lower manifold inner surface 5a of the surge tank 5 is formed on the intermediate manifold constituting member 15, and the lower wall inner surface 5a is connected to the inner wall surface 15h on the anti-engine E side as described above, and toward the anti-engine E side. Inclined downward. Therefore, the upstream end of the intake passage 7 can be extended to the surge tank 5 side. Therefore, the winding angle of the intake passage 7 can be set to 270 ° or more as described above. Thereby, the upstream end of the intake passage 7 can be extended without providing a separate member at the upstream end of the intake passage 7.

  The downstream side of the intake passage 7 from the lower annular portion 15f of each curved portion 15b constitutes the engine E side of the portion extending in a curved shape in the vertical direction so as to protrude toward the anti-engine E side downstream of the intake passage 7. It is set as the 3rd channel | path structure part 15j. The third passage constituting portion 15j is formed to extend to the downstream end constituting portion 11a of the engine side manifold constituting member 11 after extending the anti-engine E side of the second tank constituting portion 15a upward. A welding surface 15k that is vibration welded to the anti-engine side manifold constituting member 13 is formed at the periphery of the third passage constituting portion 15j.

  An upper annular portion 151 that constitutes a part of the intake passage 7 is formed so as to protrude upward at the downstream end portion of the intake passage 7 of each curved portion 15b. A welding surface 15m that is vibration welded to the welding surface 11d of the downstream end constituting portion 11a is formed on the engine E side of the upper annular portion 15l, and the anti-engine side manifold constituting member 13 vibrates on the anti-engine E side. A welding surface 15n to be welded is formed.

  Further, as shown in FIG. 4, the upper wall of the second tank constituting portion 15a located between the two curved portions 15b, 15b on the exhaust passage mounting portion 15e side in the direction in which the intake passages 7 are arranged, An intake air inlet 19 that penetrates the upper wall and communicates with the throttle body mounting portion 3 is formed.

  Next, the manufacturing procedure of the intermediate manifold component 15 having the above configuration will be described with reference to FIG. FIG. 6 is a schematic view of a forming die 21 for forming the intermediate manifold constituting member 15. The mold 21 includes a fixed mold 23 that molds the non-engine E side of the intermediate manifold component 15, a movable mold 25 that molds the engine E, and a first slide mold 27 that molds the second tank component 15a. And a second slide mold 29 that molds the outer surface of the lower annular portion 15f, and a third slide mold 33 that molds the spaces R1 to R4.

  In a state where the fixed mold 23 and the movable mold 25 are clamped, the molten resin is injected and filled into the cavity 31 formed between the four molds, and the molten resin is cooled and solidified to form an injection molded product. Next, the first to third slide molds 27, 29, and 33 are moved backward. Note that the third slide mold 33 is retracted in a direction orthogonal to the opposing direction of the fixed mold 23 and the movable mold 25, that is, the direction perpendicular to the plane of FIG. At this time, in the intermediate manifold constituting member 15, the wall inner surface 15h on the anti-engine E side at the upstream end of the intake passage 7 is inclined upward toward the anti-engine E side, and the lower wall inner surface 5a connected thereto is the anti-engine E side. Since it inclines downward toward the bottom, it has an undercut shape when viewed from the engine E side. However, in the intermediate manifold component 15, the lower wall inner surface 5 a and the upper wall inner surface 5 b are formed in parallel with each other, and the portion corresponding to the surge tank 5 on the split surface 17 with the engine side manifold component 11 is opposite. It inclines upward toward the engine E side. Therefore, the second tank constituting portion 15a does not have an undercut shape when viewed from a direction inclined upward as it goes to the engine E side. Therefore, the first slide mold 27 can be retracted as described above. Finally, the movable mold 25 is retracted, and the injection-molded product is removed from the mold by an ejector pin (not shown) provided on the movable mold 25. In this way, the intermediate manifold component 15 can be easily manufactured.

  As shown in FIG. 5, the anti-engine side manifold constituting member 13 is superposed on the anti-engine E side of the third passage constituting portion 15j and constitutes the downstream side of the intake passage 7 together with the third passage constituting portion 15j. Four fourth passage constituting portions 13a are provided. The vertical cross-sectional shape of each fourth passage component 13a is formed in a substantially U-shape and the cross-sectional shape is formed in a substantially semicircular arc shape, and the third passage component 15j is formed on the periphery of the fourth passage component 13a. A welding surface 13b that is vibration-welded to the welding surface 15k and the welding surface 15n of the upper annular portion 15l is formed.

  Each of the fourth passage constituting portions 13a is formed so as to extend substantially in the vertical direction and a middle portion in the vertical direction is curved toward the counter-engine E side. The fourth passage constituting portions 13a are separated from each other in the direction in which the intake passages 7 are arranged. A connecting wall portion 13c is formed between the two fourth passage constituting portions 13a on the exhaust passage attaching portion 15e side in the arrangement direction of the intake passages 7 so as to connect the fourth passage constituting portions 13a. The connecting wall portion 13c overlaps with the upper wall of the second tank constituting portion 15a of the intermediate manifold constituting member 15 from the outside.

  The connecting wall portion 13c is integrally formed so that the upstream side of the throttle body mounting portion 3 extends in the vertical direction. As shown in FIG. 5, the lower end of the throttle body mounting part 3 opens the connecting wall part 13c. The lower end opening of the throttle body mounting portion 3 coincides with the intake air inlet 19 of the second tank component 15a, and the inside of the throttle body mounting portion 3 and the surge tank 5 communicate with each other via the intake air inlet 19. Yes.

  Next, the manufacturing procedure of the intake manifold 1 configured as described above will be described with reference to FIGS. FIG. 7 is an exploded perspective view of the intake manifold 1, FIG. 8 is a cross-sectional view showing a process of welding the engine-side manifold component 11 to the intermediate manifold component 15, and FIG. FIG. 6 is a cross-sectional view showing a process of welding an anti-engine side manifold constituent member 13 to an assembly of manifold constituent members 15.

  First, using a vibration welding machine (not shown), as shown in FIG. 8, welding surfaces 11d, 11e, and 11g of the engine-side manifold component member 11 and welding surfaces 15m, 15d, and 15i of the intermediate manifold component member 15 are respectively provided. One component member is caused to vibrate with respect to the other component member by pressure contact. As a result, the first tank component 11b and the second tank component 15a are vibration welded to form the surge tank 5, and the second channel component 15g is superposed on the first channel component 11c. The upstream side of the intake passage 7 is configured by vibration welding. Further, using a vibration welding machine, as shown in FIG. 9, the welding surfaces 15k and 15n of the intermediate manifold component 15 and the welding surface 13b of the non-engine-side manifold component 13 are brought into pressure contact with each other. Is vibrated with respect to the other component. If it carries out like this, vibration welding will be carried out in the state where the 4th passage composition part 13a was superposed on the 3rd passage composition part 15j, and the downstream of intake passage 7 will be constituted. As a result, the engine-side manifold component member 11, the intermediate manifold component member 15, and the anti-engine-side manifold component member 13 are integrated into the intake manifold 1. And the intake manifold 1 will be in the state attached to the engine E by attaching the flange 9 of the engine side manifold structural member 11 to the engine E. FIG.

  In the above embodiment, after the anti-engine side manifold constituting member 13 and the intermediate manifold constituting member 15 are welded, the intermediate manifold constituting member 15 may be welded to the engine side manifold constituting member 11. You may make it weld these three structural members 11, 13, and 15 simultaneously.

  In the above embodiment, the upper wall inner surface 5b and the lower wall inner surface 5a formed in the second tank constituting portion 15a of the intermediate manifold constituting member 15 are parallel to each other. However, the present invention is not limited to this. The wall inner surface 5b may be inclined downward toward the anti-engine E side with a larger gradient than the lower wall inner surface 5a. Thereby, the 1st slide type | mold 27 which shape | molds the 2nd tank structure part 15a becomes easy to move.

  As described above, the resin intake manifold according to the present invention reduces the number of parts and avoids the undercut shape of the surge tank constituent part of the intermediate manifold constituent member. The present invention can be applied to provided uses.

DESCRIPTION OF SYMBOLS 1 Intake manifold 3 Throttle body attaching part 5 Surge tank 5a Lower wall inner surface 5b Upper wall inner surface 7 Intake passage 7a Upstream opening 7b Downstream opening 11 Engine side manifold structural member 11f Engine side wall inner surface 13 Anti engine side manifold structural member 15 Intermediate manifold Component member 15h Wall inner surface 17 on opposite side of engine 17 Dividing surface E Engine

Claims (5)

The throttle body mounting part (3) to which the throttle body is mounted, the surge tank (5), and the intake passage (7) communicated with the intake port of the multi-cylinder engine (E) are arranged in order toward the downstream side in the intake flow direction. Arranged and connected, the upstream side of the intake passage (7) extends from the lower side of the surge tank (5) to the anti-engine (E) side, and the downstream side faces the anti-engine (E) side of the surge tank (5) upward A multi-cylinder engine (E) resin intake manifold formed to extend toward the engine (E) after extending in a curved shape,
An engine-side manifold component (11) positioned on the engine (E) side, an anti-engine-side manifold component (13) positioned on the counter-engine (E) side of the engine-side manifold component (11), and the engine Divided into a side manifold component (11) and an anti-engine side manifold component (13) and an intermediate manifold component (15),
The upstream side of the intake passage (7) and the surge tank (5) are constituted by the engine-side manifold component (11) and the intermediate manifold component (15),
The downstream end of the intake passage (7) is located above the surge tank (5) and on the engine (E) side, and is constituted by the engine-side manifold component (11).
The wall inner surface (11f) on the engine (E) side at the upstream end of the intake passage (7) of the engine side manifold component (11) is inclined upward toward the anti-engine (E) side,
The intermediate manifold component (15) is integrally molded product, the anti-engine facing the said engine (E) side wall inner surface (11f) in the intake passage (7) upstream end of the intermediate manifold components (15) The inner wall surface (15h) on the (E) side is inclined upward toward the anti-engine (E) side, and is connected to the lower wall inner surface (5a) of the surge tank (5),
The inner surface (5a) of the lower wall of the surge tank (5) is formed in a concave shape in the longitudinal section that is released toward the downstream end side of the intake passage (7),
Both side surfaces of the lower wall inner surface (5a) on the engine (E) side and the anti-engine (E) side extend from the bottom surface of the lower wall inner surface (5a) toward the opening and away from each other.
Of the both side surfaces of the lower wall inner surface (5a), the side surface on the engine (E) side is an inclined surface that is inclined downward toward the anti-engine (E) side,
The intermediate manifold lower wall inner surface (5a) on the opposite interior wall surface of the component (15) above the surge tank in (5) (5b), said inclined surface and parallel or anti-engine large gradient than the inclined surface ( E) Inclined downward toward the side ,
The split surface (17) between the engine side manifold component (11) and the intermediate manifold component (15) corresponds to the opening of the lower wall inner surface (5a) of the surge tank (5), and the surge A resin intake manifold which is inclined upward toward the non-engine (E) side at a position corresponding to the lower wall inner surface (5a) of the tank (5) . The resin intake manifold according to claim 1,
The resin intake manifold characterized in that an angle (θ) formed between the upstream opening (7a) of the intake passage (7) and the passage center axis (7b) at the downstream end is greater than 0 ° and less than 90 °. . The resin intake manifold according to claim 1 or 2,
A plurality of the intake passages (7) are provided side by side in one direction,
The throttle body mounting portion (3) and the intake inlet (19) of the surge tank (5) communicating with the throttle body mounting portion (3) are formed between the adjacent intake passages (7). Have
This is a resin intake manifold. In the resin intake manifold according to claim 3,
The throttle body mounting portion (3) extends from the intake inlet (19) toward the anti-engine (E) side and is bent upward.
This is a resin intake manifold. In the resin intake manifold according to claim 3 or 4,
The intake inlet (19) is located below the upstream end of the intake passage (7).
This is a resin intake manifold.

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