JP5243586B2 - Engine intake manifold - Google Patents

Description

  The present invention comprises 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. In addition, the present invention relates to an engine intake manifold that includes a resonator chamber that communicates with the surge chamber via a communication passage.

  Conventionally, in an automobile, for example, Patent Document 1 discloses that a resonator chamber communicating with an interior of an intake duct of an engine is formed at 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 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, so that the resonator chamber may have a sufficient volume. There is a dislike you can't.

  The present invention has been made in view of such circumstances, and is a compact intake manifold for an engine that can sufficiently secure the volume while suppressing the protrusion amount 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 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 an intake inlet pipe and an intake pipe in the inside. An intake manifold for an engine comprising a surge chamber communicating with the surge chamber and a resonator chamber communicating with the surge chamber via a communication passage, and a portion of the resonator chamber between adjacent intake distribution pipes The first manifold half made of a synthetic resin having a plurality of intake pipes, a half of the surge chamber, a half of the resonator, and a first concave groove serving as a half of the communication passage. The opposite joint surfaces of the body and the second half of the synthetic resin having the second concave groove which is the other half of the surge chamber and the other half of the communication path are welded to each other. , The first manifesto A concave portion surrounded by the surge chamber, the plurality of intake distribution pipes, and the resonator small chamber is formed on the lower surface of the half of the cylinder, and the concave portion is welded to the first and second manifold halves. that that was for fitting of the support of the backup convex portion supporting the first manifold halves shall be the first feature.

The present invention, in addition to the first feature, wherein the the joining surfaces of the first and second manifold halves, lower weld bead to be welded to each other so as to define between the surge chamber and the resonator chamber And a lower reinforcing weld bead continuous with the lower weld bead on the ceiling wall of the recess, and is welded to the lower reinforcing weld bead continuously with the upper weld bead. that the upper reinforcing weld bead is formed in the second manifold half and second features.

  According to the first feature of the present invention, the resonator chamber that forms a part of the resonator chamber is formed by using a dead space between adjacent intake pipes, so that a sufficient volume is given to the resonator chamber. In addition, 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 enhanced.

In addition, by welding the two parts of the first and second manifold halves, a compact intake manifold with a resonator can be easily configured . In this case, a surge chamber, a plurality of Since the concave portion surrounded by the intake pipe and the resonator chamber is the concave portion for fitting the backup convex portion of the support base that supports the first manifold half when the first and second manifold halves are welded to each other, the first And the bending of the intermediate part of a 2nd manifold half can be prevented by the backup convex part of a support stand. Accordingly, since it is not necessary to form a dedicated recess for fitting the backup convex portion in the intermediate portion of the first manifold half, the first structure half without changing the original structure and shape. Welding between the intermediate portions of the first and second manifold halves can also be performed reliably.

In particular , according to the second feature of the present invention, the lower and upper reinforcing beads are welded to each other so that the surge chamber and the resonator chamber are separated from each other. The welding strength can be increased. Moreover, since the lower reinforcing weld bead is formed on the upper surface of the concave wall where the backup convex part is fitted, the concave part where the backup convex part is fitted is positioned almost directly below the lower reinforcing weld bead. As a result, the bending around the lower reinforcing weld bead can be strongly suppressed, and the lower and upper reinforcing weld beads can be more reliably welded to each other.

The top view of the intake manifold for engines which concerns on embodiment 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. 9 is a sectional view taken along line 9-9 in FIG. 3. FIG. 10 is a view taken in the direction of arrow 10 in FIG. 9. 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;

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  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,... Arranged in parallel in a substantially horizontal posture are formed on one side wall along the longitudinal direction. A common mounting flange 2 is integrally formed at the downstream end of the intake distribution pipes 1, 1. The mounting flange 4 is coupled to the engine E by a plurality of bolts. As shown in FIG. 2, when the intake manifold M is accommodated in the engine room R of the automobile, 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 hood B.

  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 formed 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, the inside of the intake manifold M is a surge chamber 5 communicating between the intake inlet pipe 3 and the four intake distribution pipes 1, 1,... As shown in FIGS. 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. 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 central portion of the surge chamber 5 can be reached without pressure loss. Therefore, regardless of the distance between each of the intake inlet pipe 3 and the four intake distribution pipes 1, 1... In parallel, 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 guide wall 6 on the intake distribution 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 portion 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, since the other side surface 6b of the intake air guide wall 6 on the side of the intake pipe 1, 1,... Is hardly involved in the induction of air flow, 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 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 10 a and 10 e and a total of five resonator chambers 10 a to 10 e communicate with each other. One end portion in the longitudinal direction of the communication chamber 11 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 above 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 volume expansion 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 volume expansion 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 can mute the intake noise generated in the surge chamber 5 in a predetermined frequency band by resonance action during the operation of the engine E, and contribute to an increase in engine torque. To do. In addition, the intake manifold M with a resonator configured in a compact manner as described above can avoid interference with the engine E and the bonnet B even if it is disposed 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 a 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 to 13c surrounded by the surge chamber 5, four intake distribution pipes 1, 1,... And the three intermediate resonator chambers 10b to 10d. The ceiling walls of the two recesses 13a and 13b adjacent on the intake inlet pipe 3 side constitute a flat wall 16 continuously to the tube walls of the two intake pipes 1 and 1 adjacent to the recesses 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). Accordingly, the first and second manifold halves MA and MB can be welded to each other at the same time as the first 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 enhanced, 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 face each other on the joint surfaces 15A and 15B, which are endless first welds that surround a part of the intake inlet pipe 3 and the entire surge chamber 5 and resonator chamber 10, respectively. The beads 20A, 20B, the second weld beads 21A, 21B with ends extending from the first weld beads 20A, 20B along one side wall of the resonator chamber 10 and the communication passage 12, and the first weld beads 20A, 20B. The reinforcing wall 9 and the intake guide wall from the proximity of the third weld beads 22A and 22B with ends and the third weld beads 22A and 22B extending along the other side wall of the passage 12 and the first weld beads 20A and 20B. 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 weld bead 27A is formed on the upper surface of the ceiling wall 16 of the recess 13a, and forms a closed-letter-shaped weld bead in cooperation with the intermediate portion of the end-attached second weld 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 a support base. 30 and the welding beads 20A to 22A and 27A on the joining surface 15A are superposed on 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.

  In this case, the support base 30 is provided with three backup convex portions 30a to 30c in the substantially central portion in addition to the usual backup portion that supports the lower periphery of the first manifold half MA, and these backup portions The projecting portions 30a to 30c are 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 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 first and second manifold halves MA and MB are bent at the central portions of the backup protrusions 30a to 30a. 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 generate | occur | produce and can weld between both reliably. The welding allowance is regulated by the regulation 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.

  In this way, the three recesses 13a to 13c formed on the lower surface of the first manifold half MA surrounded by the surge chamber 5, the four intake distribution pipes 1, 1,... And the three intermediate resonator chambers 10b to 10d. Is used for the fitting concave portions of the backup convex portions 30a to 30c of the support base 30, so that a dedicated concave portion for fitting the backup convex portions 30a to 30c is formed in the central portion 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 substantially central portion of the first manifold half MA by the support base 30, so that 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 recesses 13a to 13c into which the backup protrusions 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 bending of the peripheral portions of the second and third welding beads 21A, 22A can be firmly suppressed, and the upper and lower second and third welding beads 21A, 22A to 21B, 22B can be more reliably welded to each other.

  Further, in the second and 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 lateral widths of the other main portions. Since it is set more widely, in each end part 21Ae-23Ae; 21Be-23Be of the 2nd-4th welding beads 21A-23A; 21B-23B, a welding area can be expanded and the welding strength can be raised.

  Thus, when the intake manifold M is in use, concentrated stress is generated due to vibrations of the engine E, etc., particularly at the welded portions of the end portions of the second to fourth weld beads 21A to 23A and 21B to 23B. However, 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 can be reliably prevented.

  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 welding beads 27A and 27B constituting the square-shaped welding beads are continuously provided, the welding strength between the intermediate portions of the second welding beads 21A and 21B is enhanced by the mutual welding of the reinforcing welding 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.

  Moreover, 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. The recessed portion 13c into which the reinforced metal fitting is fitted is located substantially immediately below the reinforcing weld bead 27A. Therefore, the bending around the reinforcing 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 is connected to the corner of the surge chamber 5 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-described embodiment, and various design changes can be made without departing from the gist thereof. For example, the present invention can be applied to a multi-cylinder engine other than the above-described four cylinders. Alternatively, the half portion 6A and the other half portion 6B of the intake guide wall 6 may be formed to have substantially the same height, and the ribs 7 and the thinned recess portion 8 may be formed on the other side surface 6b of both.

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 small chamber 12 ··· Communication path 12A ··· First concave groove 12B ... second concave grooves 13a to 13c ... concave portion 15A ... first manifold half-body-side joining surface 15B ... second manifold half-body-side joining 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 (2)

A plurality of intake pipes (1) arranged in parallel in a substantially horizontal posture are provided on one side wall, and 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),
In what formed the resonator small chamber (10b-10d) used as a part of said resonator chamber (10) between adjacent intake pipes (1) ,
A plurality of intake pipes (1), a half (5A) of the surge chamber (5), a resonator chamber (10b to 10d), and a first groove (12A) serving as a half of the communication passage (12) ) Having a first manifold half (MA) made of synthetic resin, the other half (5B) of the surge chamber (5), and the second groove (12B) serving as the other half of the communication path (12). ) And the second manifold halves (MB) made of synthetic resin having mutually opposite joint surfaces (15A, 15B)
On the lower surface of the first manifold half (MA), recesses (13a-13c) surrounded by the surge chamber (5), the plurality of intake pipes (1), and the resonator small chambers (10b-10d) are formed. The recesses (13a to 13c) are formed on the support base (30) for supporting the first manifold half (MA) when the first and second manifold halves (MA, MB) are welded to each other. engine intake Maniforu de, characterized in that it has a for fitting of the backup protrusions (30 a to 30 c). The intake manifold for an engine according to claim 1 ,
Said first and second manifold halves (MA, MB) the joining surfaces of (15A, 15B), the are welded to each other so as to define between the surge chamber (5) and the resonator chamber (10) A lower weld bead (21A) and an upper weld bead (21B) are respectively formed, and a lower reinforcing weld bead (27A) continuous to the lower weld bead (21A) is formed on the ceiling wall (14) of the recesses (13a to 13c). ) to form a, that the upper reinforcing weld beads continuously to the upper weld bead (21B) is welded to the lower reinforcing weld bead (27A) (27B) formed in the second manifold half body (MB) An intake manifold for engines that features

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