JP2009091953A - Engine intake manifold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact engine intake manifold for sufficiently securing the capacity of a resonator chamber while suppressing the projection amount thereof from the upper and lower faces of the intake manifold. <P>SOLUTION: The engine intake manifold comprises a plurality of intake distribution pipes 1 arranged in parallel to one another in approximately horizontal attitude on one side wall, an intake inlet pipe 3 arranged on the other wall, a surge chamber 5 arranged inside for connecting the intake inlet pipe 4 with the intake distribution pipes 1, and the resonator chamber 10 arranged there and connected with the surge chamber 5 via a connection passage 12. The resonator chamber 10 consists of a plurality of resonator small chambers 10b, 10c passing through spaces between the plurality of intake distribution pipes 1 and protruding to the lower side of the group of intake distribution pipes 1, and a connection chamber 11 for connecting the plurality of resonator small chambers 10b, 10c with each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention includes a plurality of intake pipes arranged in parallel in a substantially horizontal posture on one side wall, an intake inlet pipe on the other wall, and a surge chamber that communicates between the intake inlet pipe and the intake pipe. And an intake manifold for an engine having a resonator chamber communicating with the surge chamber via a communication passage.

Conventionally, in an automobile, for example, Patent Document 1 discloses that a resonator chamber communicating with the interior of an intake duct of an engine is formed in an upper portion of the engine, and intake pulsation noise generated in the intake system is silenced by a resonance action of the resonator chamber. As it is already known.
JP 2006-183565 A

  By the way, a plurality of intake pipes arranged in parallel in a substantially horizontal posture are provided on one side wall, an intake inlet pipe is provided on the other wall, and a surge chamber is provided inside to communicate between the intake inlet pipe and the intake pipe. If the above prior art is applied to the intake manifold, a resonator chamber is arranged above or below the surge chamber of the intake manifold to allow communication between the two chambers. When housed in a narrow engine room of an automobile, the resonator chamber that protrudes greatly above or below the surge chamber may interfere with the engine or bonnet. There is a dislike you can't.

  The present invention has been made in view of such circumstances, and is a compact engine intake manifold that can sufficiently secure the volume while suppressing the amount of protrusion of the resonator chamber from the upper surface and the lower surface of the intake manifold. The purpose is to provide.

  In order to achieve the above object, the present invention comprises a plurality of intake pipes arranged in parallel in a substantially horizontal posture on one side wall and an intake inlet pipe on the other wall, and an intake inlet pipe and an intake pipe in the inside. An intake manifold for an engine comprising a surge chamber that communicates with the surge chamber and a resonator chamber that communicates with the surge chamber via a communication passage, the resonator chamber passing through a plurality of intake manifold pipes. The first feature is that the plurality of resonator chambers projecting downward from the intake pipe group and the communication chambers that communicate with each other.

  In addition to the first feature, the present invention has a second feature in that the communication chamber is formed to be flat in the vertical direction so as to cross the upper surface of the intake pipe group.

  In addition to the second feature, the present invention provides a first synthetic resin having a plurality of intake pipes, a half of a surge chamber, a plurality of small resonator chambers, and a first concave groove serving as a half of a communication path. Weld the opposing joint surfaces of the manifold half and the second manifold half made of synthetic resin with the second groove in the other half of the surge chamber, the communication chamber, and the other half of the communication passage. A plurality of recesses surrounded by a surge chamber, a plurality of intake distribution pipes and a plurality of resonator chambers are formed on the lower surface of the first manifold half, and these recesses are formed between the first and second manifold halves. A third feature is that the back-up projections of the support base that supports the first manifold half are used for fitting at the time of welding.

  Furthermore, in addition to the third feature of the present invention, a lower weld bead and an upper weld welded to each other so as to partition the surge chamber and the resonator chamber are formed on both joint surfaces of the first and second manifold halves. Forming a weld bead and forming a lower reinforcing weld bead continuous with the lower weld bead on at least a part of the ceiling wall of the plurality of recesses, and the lower reinforcing weld bead continuous with the upper weld bead; A fourth feature is that an upper reinforcing weld bead to be welded is formed in the second manifold half.

  According to the first feature of the present invention, the plurality of resonator chambers forming the main part of the resonator chamber are formed using not only the dead space between the plurality of intake pipes but also the dead space below them. Therefore, a sufficient volume can be given to the resonator chamber, and unnecessary protrusion of the resonator chamber to the lower surface of the intake manifold can be prevented. Therefore, the intake manifold can be made compact, and the function of the resonator chamber can be improved. Can be increased.

  According to the second feature of the present invention, the communication chamber communicating between the plurality of resonator chambers has a vertically flat shape extending across the upper surface of the intake pipe, so that the communication chamber is also an intake manifold. While minimizing the protrusion from the top surface, it contributes to the expansion of the volume of the resonator chamber and prevents the intake manifold from being enlarged by the resonator chamber and can be made compact.

  According to the third aspect of the present invention, a compact intake manifold with a resonator can be easily constructed by welding two members of the first and second manifold halves. At this time, the plurality of recesses surrounded by the surge chamber, the plurality of intake pipes, and the plurality of resonator chambers on the lower surface of the first manifold half are welded to each other when the first and second manifold halves are welded to each other. Therefore, the intermediate protrusions of the first and second manifold halves can be prevented from being bent by the backup protrusions of the support base. Therefore, it is not necessary to form a dedicated recess for fitting the backup convex portion in the intermediate portion of the first manifold half, so that the original structure and shape of the first manifold half can be changed without changing the original structure and shape. Welding between the intermediate portions of the first and second manifold halves can also be performed reliably.

  According to the fourth aspect of the present invention, the welding strength between the intermediate portions of the lower and upper welding beads which are welded to each other so as to partition the surge chamber and the resonator chamber by welding the lower and upper reinforcing welding beads. Can be strengthened. In addition, since the lower reinforcing weld bead is formed on the upper surface using the ceiling wall of the concave part where a part of the backup convex part is fitted, the concave part where the backup convex part is fitted is an abbreviation of the lower reinforcing weld bead. It is located immediately below, and the bending around the lower reinforcing weld bead is strongly suppressed, so that the lower and upper reinforcing weld beads can be more reliably welded to each other.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

  1 is a plan view of an intake manifold for an engine according to an embodiment of the present invention, FIG. 2 is a left side view of the intake manifold, FIG. 3 is a bottom view of the intake manifold, and FIG. 4 is a first manifold half of the intake manifold. FIG. 5 is a plan view of the second manifold half of the intake manifold as viewed from the inside, FIG. 6 is a plan view of the essential part of FIG. 7 is a sectional view taken along line 7-7, FIG. 8 is a sectional view taken along line 8-8 in FIG. 3, FIG. 9 is a sectional view taken along line 9-9 in FIG. 3, FIG. 3 is a sectional view taken along the line 11-11 of FIG. 3, and FIG. 12 is a sectional view taken along the line 12-12 of FIG.

  First, in FIG. 1 to FIG. 3, a symbol M indicates an intake manifold for a four-cylinder engine E mounted on an automobile. The intake manifold M has a box shape whose longitudinal direction is the left-right direction in FIG. 1, and four intake distribution pipes 1, 1,. A common mounting flange 2 is integrally formed at the downstream end of the intake pipes 1, 1. The mounting flange 4 is connected to the engine E by a plurality of bolts. As shown in FIG. 2, the intake manifold M is disposed in the upper part of the engine room R so as to be close to the lower surface of the bonnet B when housed in the engine room R of the automobile.

  Further, an intake inlet pipe 3 is integrally formed on one end wall of the intake manifold M along the arrangement direction of the four intake distribution pipes 1, 1..., And a rectangular mounting flange 4 is provided upstream of the intake inlet pipe 3. It is integrally formed. A throttle body T is attached to the attachment flange 4 with a plurality of bolts.

  Further, as shown in FIGS. 4 to 9, the inside of the intake manifold M is a surge chamber 5 that communicates between the intake inlet pipe 3 and the four intake distribution pipes 1, 1,... 5, the opening end of the intake inlet pipe 3 to the surge chamber 5 extends from the edge of the intake distribution pipes 1, 1... In the arrangement direction of the intake distribution pipes 1, 1. An intake guide wall 6 is provided. As clearly shown in FIGS. 4 to 6, the intake guide wall 6 is slightly inclined with respect to the axis X of the intake inlet pipe 3 so as to move away from the intake distribution pipes 1, 1. ing. Further, one side surface of the intake guide wall 6 opposite to the intake pipes 1, 1... Is formed on a smooth surface 6 a that is continuous with the inner peripheral surface of the intake inlet pipe 3.

  Thus, the air that flows into the intake inlet pipe 3 due to the intake action of the engine, as shown by the arrow D1 in FIGS. 4 and 6, is a smooth surface 6a of the intake guide wall 6 that continues to the inner surface of the intake inlet pipe 3. By being guided more smoothly, the center of the surge chamber 5 can be reached without pressure loss. Therefore, regardless of the distance between the intake inlet pipe 3 and the four parallel intake intake pipes 1, 1,..., The air is surged as shown by an arrow D2 in FIGS. The air is distributed substantially evenly from the central portion of the chamber 5 to the four intake distribution pipes 1, 1,..., So that the intake efficiency of each cylinder of the engine E can be increased and the engine output can be improved.

  Further, as shown in FIGS. 6, 9, and 10, on the other side surface 6 b of the intake air guide wall 6 on the intake pipe 1, 1... A plurality of lightening recesses 8, 8... Are formed leaving 7, 7. A reinforcing wall 9 extending so as to be orthogonal to the intake guide wall 6 is integrally connected to an end of the intake guide wall 6 on the intake inlet pipe 3 side.

  Thus, the intake guide wall 6 can be thinned by the plurality of thinned recesses 8, 8... And the rigidity of the intake guide wall 6 can be enhanced by the plurality of ribs 7, 7.. Generation of vibration noise of the intake guide wall 6 due to the pulsation of the intake pressure at this point can be prevented. In addition, the other side surface 6b of the intake guide wall 6 on the side of the intake pipes 1, 1,... Has little influence on the induction of air flow, so that the ribs 7, 7,. ... is hardly an intake resistance. Thus, it is possible to satisfy both the thinning of the intake guide wall and the securing of rigidity while the intake guide wall 6 exhibits a good intake guide function.

  As shown in FIGS. 4 to 9, a resonator chamber 10 that communicates with the surge chamber 5 via the communication path 12 is further provided inside the intake manifold M. The resonator chamber 10 is formed on the outer sides of the three resonator small chambers 10b to 10d defined between the four intake distribution pipes 1, 1... And the intake distribution pipes 1, 1. The upper and lower communication chambers 11 are arranged so as to extend across the upper surfaces of the intake pipes 1, 1... So that the two resonator chambers 10a and 10e and a total of five resonator chambers 10a to 10e communicate with each other. One end of the communication chamber 11 in the longitudinal direction is communicated with the central portion of the surge chamber 5 through the communication passage 12. At this time, the resonator chambers 10a to 10e are formed so as to protrude downward from the lower surfaces of the adjacent intake pipes 1, 1. However, desirably, the protrusions of the resonator small chambers 10 a to 10 e from the intake pipes 1, 1... From the lower surface are stopped at a position higher than the height of the lower surface of the surge chamber 11.

  As described above, the plurality of resonator small chambers 10a to 10e forming the main part of the resonator chamber 10 include not only the dead space between the plurality of intake distribution pipes 1, 1. Since the outer dead space and the dead space below the outer dead space are used, a sufficient volume can be given to the resonator chamber 10 and unnecessary protrusion of the resonator chamber 10 to the lower surface of the intake manifold M can be prevented. Therefore, the intake manifold M can be prevented from being enlarged by the resonator chamber 10. Further, the communication chamber 11 communicating between the plurality of resonator small chambers 10a to 10e has a vertically flat shape extending across the upper surface of the intake pipes 1, 1,... While minimizing the protrusion from the upper surface of the manifold M, it contributes to the expansion of the volume of the resonator chamber 10 and prevents the intake manifold M from being enlarged by the resonator chamber 10 and can be made compact. Further, the communication chamber 11 communicating between the plurality of resonator small chambers 10a to 10e has a vertically flat shape extending across the upper surface of the intake pipes 1, 1,... While minimizing the protrusion from the upper surface of the manifold M, it contributes to the expansion of the volume of the resonator chamber 10 and prevents the intake manifold M from being enlarged by the resonator chamber 10 and can be made compact. The resonator chamber 10 having a sufficient volume in this way enables the silence of the intake noise generated in the surge chamber 5 in a predetermined frequency band by the resonance action during the operation of the engine E, and contributes to an increase in engine torque. To do. Moreover, the intake manifold M with a resonator having a compact configuration as described above can avoid interference with the engine E and the bonnet B even if it is arranged in the upper part of the narrow engine room R of the automobile. It is particularly effective for automobiles.

  4 to 9, the intake manifold M is composed of a lower first manifold half MA and an upper second manifold half MB, which are individually molded with synthetic resin, and both manifold halves. MA and MB are joined together by vibration friction welding their joint surfaces 15A and 15B facing each other.

  The first manifold half MA includes a mounting flange 2, a half part 3 A of the intake inlet pipe 3, a half part 5 A of the surge chamber 5, a half part 6 A of the intake guide wall 6, and the intake distribution pipes 1, 1. ... a group, a mounting flange 2, a group of resonator chambers 10a to 10e, and a shallow first concave groove 12A that is one half of the communication path 12 are provided. On the other hand, the second manifold half MB includes the other half 3B of the intake inlet pipe 3, the other half 5B of the surge chamber 5, the other half 6B of the intake guide wall 6, the communication chamber 11, and the communication passage. 12 is provided with a deep second concave groove 12 </ b> B that is the other half of the twelve and the other half 9 </ b> B of the reinforcing wall 9.

  On the lower surface of the first manifold half MA, there are formed three recesses 13a-13c surrounded by the surge chamber 5, four intake distribution pipes 1, 1,... And the three intermediate resonator chambers 10b-10d. The ceiling walls of the two concave portions 13a and 13b adjacent on the intake inlet pipe 3 side constitute a flat wall 16 continuously to the pipe walls of the two intake pipes 1 and 1 adjacent to the concave portions 13a and 13b. The shallow groove 12A is formed in the flat wall 16.

  One half 6A of the air intake guide wall 6 is formed with a low height, the other half 6B is formed with a high height, and the other half 6B has a plurality of ribs 7, 7,. The lower ends of the hollow recesses 8, 8... End before the lower end surface of the other half 6B, that is, the joining surface 15B (see particularly FIGS. 9 and 10). Therefore, the first and second manifold halves MA and MB can be welded together, and the one half 6A and the other half 6B of the intake guide wall 6 can be welded together to form a strong intake guide wall 6. Thus, the rigidity of the intake manifold M can be increased, and the welding area of the half portion 6A and the other half portion 6B of the intake guide wall 6 can be prevented from decreasing due to the hollow portions 8, 8,. The welding strength between the portions 6A and 6B can be increased.

  The first and second manifold halves MA and MB are opposed to each other on the joint surfaces 15A and 15B, respectively, and endless first welds that surround a part of the intake inlet pipe 3 and the surge chamber 5 and the resonator chamber 10 as a whole. The beads 20A and 20B, the second weld beads 21A and 21B with ends extending along the side walls of the resonator chamber 10 and the communication passage 12 from the first weld beads 20A and 20B, and the first weld beads 21A and 21B. The reinforcing wall 9 and the intake guide wall from the proximity of the third weld beads 22A, 22B having ends and extending along the other side wall of the passage 12 and the first weld beads 21A, 21B of the third weld beads 22A, 22B. 6 is formed with the end-ended fourth beads 23A and 23B extending along the line 6.

  Further, on the joint surface 15B of the second manifold half MB, a pair of restricting walls 25, 25 standing between the grooves 24, 24 on both sides in the width direction of the first to fourth welding beads 20B-23B (see FIG. 7). Is formed.

  4 and 5, the lateral widths of the end portions 21Ae to 23Ae; 21Be to 23Be of the second to fourth weld beads 21A to 23A; 21B to 23B of the first and second manifold halves MA and MB are the other main widths. It is set wider than the width of the part.

  Of the three recesses 13a to 13c of the first manifold half MA, the upper surface of the ceiling wall 16 of one recess 13a that is not related to the formation of the flat wall 16 is a joint surface on the first manifold half MA side. A reinforcing welding bead 27A is formed on the upper surface of the ceiling wall 16 of the recess 13a, and forms a closed-letter-shaped welding bead in cooperation with the intermediate portion of the end-attached second welding bead 21A. The Correspondingly, a reinforcing weld bead 27B is also formed on the joint surface 15B of the second manifold half MB, and a part of the restriction wall 25 is extended so as to surround it.

  As shown in FIGS. 8 and 11, when welding the joint surfaces 15A and 15B of the first and second manifold halves MA and MB, the first manifold half MA is placed with the joint surface 15A facing upward and the support base. 30 and the welding beads 20A to 22A and 27A on the joining surface 15A are overlapped with the welding beads 20B to 22B and 27B on the joining surface 15B of the second manifold half MB, and this second manifold half MB. The presser vibration jig 31 that presses from above is vibrated along the longitudinal direction of the intake manifold M.

  At that time, the support base 30 is provided with a normal backup portion for supporting the lower periphery of the first manifold half MA, and in particular with three backup convex portions 30a to 30c at the substantially central portion. The convex portions 30a to 30c are formed on the lower surface of the first manifold half MA and surrounded by the surge chamber 5, four intake distribution pipes 1, 1,... And the three intermediate resonator chambers 10b to 10d. It fits into the recesses 13a to 13c and comes into contact with their ceiling surfaces. Therefore, when the second manifold half MB is vibrated while being pressed from above by the presser vibration jig 31, the central protrusions of the first and second manifold halves MA and MB are deformed by the backup convex portions 30a to 30a of the support base 30. 30c can prevent the frictional heat evenly between the first welding beads 20A and 20B around the intake manifold M and between the second to fourth welding beads 21A to 22A and 21B to 22B. It can be generated and reliably welded between the two. The welding allowance is regulated by the restriction wall 25 of the second manifold half MB contacting the contact surface 15A of the first manifold half MA, and the burrs generated by the welding are separated from the regulation wall 25 and each It is accommodated in the groove 24 between the weld beads.

  As described above, the three recesses 13a to 13c formed on the lower surface of the first manifold half MA and surrounded by the surge chamber 5, the four intake distribution pipes 1, 1,... And the intermediate three resonator chambers 10b to 10d. Is used as a fitting recess for the backup projections 30a to 30c of the support base 30, so that a dedicated recess for fitting the backup projections 30a to 30c is formed in the center of the first manifold half MA. Therefore, without supporting the original structure and shape of the first manifold half MA, it is possible to firmly support the first central half MA of the first manifold half MA by the support base 30, and both the manifolds can be supported. A good welded portion can be formed between the half bodies MA and MB. In the case of the illustrated example, in particular, the concave portions 13a to 13c into which the backup convex portions 30a to 30c are fitted are positioned substantially immediately below the second and third weld beads 21A and 22A of the first manifold half MA. The second and third weld beads 21A, 22A and the periphery of the second weld beads 21A, 22A is firmly suppressed, and the upper and lower second and third weld beads 21A, 22A-21B, 22B are more welded together. It can be done reliably.

  Further, in the second to fourth weld beads 21A to 23A; 21B to 23B of the first and second manifold halves MA and MB, the lateral widths of the end portions 21Ae to 23Ae; 21Be to 23Be are the other main parts. Therefore, the end areas 21Ae to 23Ae and 21Be to 23Be of the second to fourth welding beads 21A to 23A; 21B to 23B can be expanded to increase their welding strength. it can.

  Thus, when the intake manifold M is in use, concentrated stress is generated at the welded portions of the end portions of the second to fourth welded beads 21A to 23A; However, it is possible to reliably prevent peeling of the welded portions at the respective end portions of the second to fourth weld beads 21A to 23A; 21B to 23B due to the concentrated stress.

  Further, among the second to fourth weld beads 21A to 23A; 21B to 23B having ends, the middle part of the longest second weld beads 21A and 21B is closed in cooperation with the second weld beads 21A and 21B. Since the reinforcing weld beads 27A and 27B constituting the square-shaped weld bead are connected in series, the weld strength between the intermediate portions of the second weld beads 21A and 21B is enhanced by the mutual welding of the reinforcing weld beads 27A and 27B. As a result, it is possible to reliably prevent peeling of the welded portion between the second welded beads 21A and 21B due to vibration.

  In addition, the reinforcing weld bead 27A on the first manifold half MA side is formed on the upper surface of the ceiling wall 14 of the recess 13c into which a part of the backup protrusion 30c is fitted, so the backup protrusion 30c. Since the concave portion 13c into which the butt is fitted is positioned substantially immediately below the reinforcing weld bead 27A, the bending around the reinforced weld bead 27A is strongly suppressed, and the mutual welding between the upper and lower reinforcing weld beads 27A and 27B is further improved. It can be done reliably.

  As shown in FIGS. 5 and 12, the second manifold half MB has a surge chamber 5 at the corner away from the intake inlet pipe 3 to the outermost intake distribution pipe 1 away from the intake inlet pipe 3. A guide wall 33 having an arcuate cross section for smoothly guiding the air flow is provided.

  The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention. For example, the present invention can be applied to a multi-cylinder engine other than the above-described four cylinders. Further, the half portion 6A and the other half portion 6B of the intake guide wall 6 can be formed to have substantially the same height, and the rib 7 and the thinned recess portion 8 can be formed on the other side surface 6b of both.

The top view of the intake manifold for engines which concerns on the Example of this invention. The left view of the same intake manifold. The bottom view of the same intake manifold. The top view which looked at the 1st manifold half of the intake manifold from the inside. The top view which looked at the 2nd manifold half body of the same intake manifold from the inside. The top view which fractured | ruptured and showed the principal part of FIG. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 3. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 3. FIG. 10 is a view taken in the direction of arrow 10 in FIG. 9. The perspective view of the elastic seal member attached to a valve body. FIG. 11 is a sectional view taken along line 11-11 in FIG. 3; FIG. 12 is a sectional view taken along line 12-12 in FIG. 3;

Explanation of symbols

M ... Intake manifold MA ... First manifold half MB ... Second manifold half 1 ... Intake distribution pipe 3 ... Intake inlet pipe 5 ... ··· Surge chamber 5A ··· One half of surge chamber 5B ··· Other half of surge chamber 10 ··· Resonator chambers 10b to 10d · Resonator chamber 11 · · · Communication chamber 12 ··· ..Communication path 12A ... first concave groove 12B ... second concave grooves 13a to 13c ... concave 15A ... joining surface 15B on the first manifold half side ... joining on the second manifold half side Surface 21A ... Lower weld bead (second weld bead on the first manifold half)
21B ... Upper weld bead (second weld bead on the second manifold half)
27A ... Lower reinforcement weld bead 27B ... Upper reinforcement weld bead 30 ... Support bases 30a-30c ... Backup convex part

Claims (4)

A plurality of intake pipes (1) arranged in parallel in a substantially horizontal posture are provided on one side wall, an intake inlet pipe (3) is provided on the other wall, and an intake inlet pipe (3) and an intake pipe (1) are provided inside. An intake manifold for an engine comprising a surge chamber (5) communicating with each other and a resonator chamber (10) communicating with the surge chamber (5) via a communication passage (12),
A plurality of resonator chambers (10b to 10c) projecting downward from the group of intake pipes (1) through the intake pipes (1), and the resonator chambers (10); An intake manifold for an engine comprising a small chamber (10b to 10c) and a communication chamber (11) communicating with each other. The engine intake manifold of claim 1,
An intake manifold for an engine, characterized in that the communication chamber (11) is formed so as to cross the upper surface of the intake manifold (1) group and to be flattened up and down. An intake manifold for an engine according to claim 2,
A plurality of intake pipes (1), a half (5A) of the surge chamber (5), a plurality of resonator chambers (10b to 10c), and a first groove (12A) serving as a half of the communication passage (12) The first manifold half (MA) made of synthetic resin and the second concave groove serving as the other half of the surge chamber (5), the other half (5B), the communication chamber (11), and the communication passage (12). (12B) and the second manifold half (MB) made of synthetic resin, which are opposed to each other, are welded to each other, and the lower surface of the first manifold half (MA) is A plurality of recesses (13a-13c) surrounded by a surge chamber (5), a plurality of intake pipes (1), and a plurality of resonator small chambers (10b-10c) are formed. And the second manifold half (MA, MB) are welded together, An intake manifold for an engine, characterized in that it is used for fitting a backup projection (30a) of a support base (30) that supports a fold half (MA). An intake manifold for an engine according to claim 3,
Lower weld beads (21A) welded to the joint surfaces (15A, 15B) of the first and second manifold halves (MB) so as to partition the surge chamber (5) and the resonator chamber (10). ) And an upper weld bead (21B), and a lower reinforcing weld bead (21A) continuous to the lower weld bead (21A) on at least a part of the ceiling wall (14) of the plurality of recesses (13a to 13c). 27A) and an upper reinforcing weld bead (27B) that is welded to the lower reinforcing weld bead (27A) in succession to the upper weld bead (21B) is formed in the second manifold half (MB). An intake manifold for engines that features

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