JP2008057482A - Resin intake manifold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin intake manifold suppressing increase in dead material by ribs near welding protrusions of a lower case, while sufficiently securing stiffness of an intake manifold itself. <P>SOLUTION: The intake manifold is manufactured by connecting the welding protrusions 22a, 25a of a lower case side joint collar 22 with a lower case side joint part 25 and protrusions 47a, 48a of a second middle case side protrusion 47 and a middle case side joint part 48, by means of vibration-welding. In the intake manifold, a screen part 22d is disposed to a joint line of the lower case side joint part 25 of an upper edge of the lower case so as to serves as a screen of a welding burr G generated in welding with the protrusion 48a of the middle case side joint part 48, and is projected upward to be orthogonal to a directing where the welding projection 25a of lower case side joint part 25 faces the protrusion 48a of middle case side joint part 48. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a resin intake manifold manufactured by joining protrusions of welding portions of two divided bodies by vibration welding.

  In general, a resin intake manifold is manufactured by vibrating and welding ridges in a welding portion of a divided body divided into a plurality of parts.

  By the way, since welding burr | flash generate | occur | produces at the time of welding of the protrusions of each division | segmentation body, it will become a very bad appearance.

In view of this, conventionally, a rib provided with a rib for concealing a welding burr on the outer side of the ridge of one divided body is known (for example, see Patent Document 1).
JP 2004-316468 A

  However, in the above-mentioned conventional one, since the rib for concealing the welding burr is provided outside the protrusion of the first divided body as one divided body, the second divided body as the other divided body is provided. Joining can be performed only between the protrusions of the second divided body, and the rigidity of the resin intake manifold itself cannot be sufficiently ensured.

  In addition, if ribs for concealing the welding burrs are provided outside the protrusions of the first divided body, the thickness of the ribs in the vicinity of the protrusions of the first divided body is increased by the ribs, so that the welding burrs are hidden. Since the ribs are not involved in the rigidity of the resin intake manifold, it is unavoidable that the ribs increase due to the ribs for hiding the welding burrs.

  The present invention has been made in view of such a point, and the object of the present invention is to secure the rigidity of the resin intake manifold itself while preventing ribs due to ribs in the vicinity of the protrusions of the first divided body. An object of the present invention is to provide a resin intake manifold capable of suppressing the increase.

  In order to achieve the above object, the present invention is premised on a resin intake manifold manufactured by joining the protrusions of the welded portions of the first and second divided bodies by vibration welding. And on the outer side of the ridges of the first divided body, the direction in which the ridges of the welded portions of the respective divided bodies face each other so as to hide the welding burrs generated at the time of welding with the ridges of the second divided body, Is provided with a partition that protrudes in the orthogonal direction.

  Due to this specific matter, a welding portion for the second divided body is secured by the partition portion protruding in a direction orthogonal to the direction in which the protruding portions of the welded portions of each divided body face each other on the outside of the first divided body. Thus, the partition portion serves as a receiving surface at the time of welding with the second divided body, and the rigidity of the resin intake manifold itself can be sufficiently ensured.

  In addition, the above-mentioned partition portion blinds the welding burrs generated when the second divided body is welded to the ridges, and it is necessary to provide a rib for hiding the welding burrs on the outside of the first divided body ridges. As a result, it is possible to reduce the bursiness due to the ribs near the ridges of the first divided body, and to suppress the increase of the bursiness due to the ribs near the ridges of the first divided body.

  The second divided body has a surge tank portion, a port portion provided above the surge tank portion, connected to the engine, and intake air from the surge tank portion with respect to the port portion. An intake pipe that is fed around the back side of the gas pipe, and the partition portion shields a space formed between the surge tank portion, the port portion, and the intake pipe of the second divided body. In the case of projecting upward, even if spatial resonance that becomes radiated sound occurs in the space, the radiated sound leaks out of the space by the screen portion protruding upward so as to shield the space. This can be effectively prevented.

  Further, when the second divided body is provided with a reinforcing rib extending in a direction orthogonal to the partition portion so that the end surface faces the partition portion, the reinforcing rib for reinforcing the second divided body itself is the partition. In addition to being received by the portion, the end face of the reinforcing rib is welded and fixed to the partition during vibration welding, and the rigidity of the resin intake manifold can be effectively increased.

  As described above, in short, the portion to be welded to the second divided body is secured by the partition portion protruding in the direction orthogonal to the direction in which the protruding portions of the welded portions of each divided body face each other on the outer side of the first divided body. The partition portion is used as a receiving surface during welding with the second divided body, and the rigidity of the resin intake manifold itself can be sufficiently secured. In addition, the partitioning part conceals the welding burr generated at the time of welding with the protrusions of the second divided body, abolishes the rib for hiding the welding burr, and the ribs near the protrusions of the first divided body are used. Increase in meat can be suppressed.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  1 is a perspective view of an intake manifold applied to an in-line four-cylinder engine as viewed from one side, FIG. 2 is a side view of the intake manifold as viewed from the other side, and FIG. 3 is an intake manifold as viewed from the engine side. FIG. 4 is a front view of the intake manifold as viewed from the side opposite to the engine. The intake manifold 1 includes a lower case 2 as a first divided body, an upper case 3, and the lower case 2 described above. And a middle case 4 as a second divided body provided between the upper case 3 and the upper case 3. The lower case 2, the upper case 3 and the middle case 4 are each formed of a thermoplastic synthetic resin such as 6 nylon containing filler, and constitute a resin intake manifold 1. The intake manifold 1 is assembled between a throttle body (not shown) and an intake port of a cylinder head of the engine.

  As shown in FIG. 5, the middle case 4 is provided with a surge tank 41 (surge tank portion) formed in a substantially semicircular cross section, and above the surge tank 41, and includes four engine cylinder heads. A port mounting flange 42 as a port portion having four ports 42a, 42a,... (Shown in FIG. 3) individually connected to the intake port, and the back side (anti-engine side) of the surge tank 41 Inside the four distribution passages 11 (only one is shown in FIG. 5) (the engine side) as intake pipes for distributing and supplying intake air from the surge tank 41 to the ports 42a (port mounting flanges 42) And a throttle provided on the other side of the surge tank 41 (right side in FIG. 4). And a de-mounting portion 44. In this case, a space K (shown in FIG. 5) is provided between the surge tank 41 of the middle case 4, the port mounting flange 42, and each distribution passage inner portion 43. The upper end of the tank 41 extends outward (on the side opposite to the engine) and is surrounded by the upper wall 41a connected to each distribution passage inner portion 43 and the port mounting flange 42, and opens inward (engine side). ing.

  The upper case 3 is joined to the distribution passage inner portions 43, 43,... From the non-engine side, and forms the outer side of the distribution passage 11 (the anti-engine side) together with the distribution passage inner portions 43. .. Are provided.

  The lower case 2 has a substantially semicircular cross section, and is provided with distribution passage upstream portions 21, 21,... That are joined to the inner side of the middle case 4 and constitute the upstream side of the distribution passages 11. Each upstream portion 21 of each distribution passage is joined to the upstream end of each distribution passage 11 including each distribution passage inner portion 43 of the middle case 4 and each distribution passage outer portion 31 of the upper case 3. ing.

  Then, the upper case 3 and the middle case 4 are welded by vibration welding along a joining line provided at the peripheral edge portions (peripheral edge portion of the upper case 3 and the peripheral edge portion on the non-engine side of the middle case 4) facing each other. It is like that. As shown in FIG. 6, the upper case 3 and the middle case 4 include an upper case side joining rod 32 and a first middle case side joining rod that are continuous outward along a joining line of peripheral edges facing each other. 45 (welded portion) are provided. The first middle case side joint rod 45 of the joint rods 32, 45 has a protrusion 45a that protrudes toward the upper case side joint rod 32 side from a substantially central position in the inner and outer directions of the joint line along the joint line. Are provided continuously. On the other hand, on the upper case side joining rod 32, a welding projection 32a that protrudes toward the first middle case side joining rod 45 from the substantially center position in the inner and outer directions of the joining line and is welded to the projection 45a is joined to the upper case side joining rod 32. It is provided continuously along. The upper case side joining rod 32 is joined with inner and outer ribs 32b and 32c projecting from the inner and outer sides of the joining line toward the first middle case side joining rod 45 with the welding protrusion 32a interposed therebetween. It is provided continuously along the line. As shown in FIG. 6, the inner side of the joining line is surrounded by the protrusion 45a of the first middle case side joining rod 45, the inner rib 32b of the upper case side joining rod 32, and the welding projection 32a. The burr pool 33 is continuously formed along the joining line, and on the outside of the joining line, the protrusion 45a of the first middle case side joining rod 45, the outer rib 32c of the upper case side joining rod 32, and welding are provided. The outer burr pool 34 surrounded by the protrusion 32a is formed continuously along the joining line, and the upper case side joining rod 32 is welded to the projection 45a of the first middle case side joining rod 45. When the welding protrusion 32a becomes a welding burr G by vibration welding and flows out to both the inner and outer sides of the joining line, the welding burr G becomes the inner burr pool 33 and the outer burr pool 3, respectively. Is adapted to be reservoir is received by the.

  In addition, the lower case 2 and the middle case 4 are welded by vibration welding along the joining lines provided at the opposite peripheral portions (the peripheral portion of the lower case 2 and the peripheral portion on the engine side of the middle case 4). ing. Of the peripheral edge portion of the lower case 2, the lower edge and the left and right side edges excluding the upper edge serve as joint portions that continue outwardly along the joint lines of the lower edge and the left and right side edges facing each other. A lower case side joining rod 22 and a second middle case side joining rod 47 are provided. On the engine side surface of the second middle case side joining rod 47, a protrusion 47a is provided continuously along the joining line so as to protrude from the substantially center position in the inside and outside direction of the joining line toward the lower case side joining rod 22 side. Yes. On the other hand, the lower case side joining rod 22 projects toward the second middle case side joining rod 47 from the substantially center position in the inner and outer directions of the joining line and is welded to the above-mentioned projection 47a (projection). Are continuously provided along the joining line. The lower case side joining rod 22 has inner and outer ribs 22b and 22c projecting from the inner and outer sides of the joining line toward the second middle case side joining rod 47 with the welding protrusion 22a interposed therebetween. It is provided continuously along. The inner burr pool 23 surrounded by the projection 47a of the second middle case side joining rod 47, the inner rib 22b of the lower case side joining rod 22 and the welding projection 22a is joined to the inside of the joining line of the lower case 2. On the other hand, on the outer side of the joining line of the lower case 2, the protrusion 47 a of the second middle case side joining rod 47, the outer rib 22 c of the lower case side joining rod 22, and the welding projection 22 a are formed along the line. The outer burr pool 24 surrounded by and is continuously formed along the joining line, and the welding protrusion 22a of the lower case side joining rod 22 is welded to the protrusion 47a of the second middle case side joining rod 47. When welding becomes a welding burr G by vibration welding and flows out to both the inner and outer sides of the joining line, the welding burr G becomes the inner burr pool 23 and the outer burr pool, respectively. It is adapted to be reservoir is received by 24.

  As shown in FIG. 7, the lower case side joint portion 25 as a joint portion that is continuous along the joint lines facing each other at the upper edge of the upper edge of the peripheral portions of the lower case 2 and the middle case 4. A middle case side joint 48 is also provided. The middle case side joint portion 48 is continuously provided with a ridge 48a protruding from the center position in the inner and outer direction of the joint line toward the lower case side joint portion 25 along the joint line. On the other hand, in the lower case side joint portion 25, a welding protrusion 25a that protrudes toward the middle case side joint portion 48 from the center position in the inner and outer directions of the joining line and is welded to the protrusion 48a is continuously provided along the joining line. Is provided. The lower case side joint portion 25 is continuously provided with inner ribs 25b protruding from the inner side of the joint line toward the middle case side joint portion 48 along the joint line. Further, an inner burr pool 26 surrounded by the protrusion 48a of the middle case side joint portion 48, the inner rib 25b of the lower case side joint portion 25, and the welding protrusion 25a is joined to the inner side of the joint line at the upper edge of the lower case 2. It is formed continuously along the line. Further, on the outer side of the joining line of the lower case side joining portion 25, the welding protrusion of the lower case side joining portion 25 so as to conceal the welding burr G generated when the middle case side joining portion 48 is welded to the protrusion 48a. A partition portion 22 d that protrudes in a direction orthogonal to the direction in which the strips 48 a of the strip 25 a and the middle case side joint 48 face each other is provided. The partition portion 22d protrudes upward so as to shield the space K between the upper wall 41a of the surge tank 41 and the port mounting flange 42 from the inside (engine side). In this case, when the welding ridge 25a of the lower case side joining portion 25 welded to the ridge 48a of the middle case side joining portion 48 becomes welding burrs G by vibration welding and flows out to both the inside and outside of the joining line, the joining line The weld burr G that has flowed out to the inside is received and stored by the inner burr reservoir 26, while the weld burr G that has flowed out to the outside of the joint line is outward from between the lower case side joint 25 and the middle case side joint 48. It flows out (upward) as it is.

  Further, the upper wall 41a of the middle case 4 has four substantially T-shaped sections extending in the inner and outer directions of the engine (left and right directions in FIGS. 1, 2 and 7) to reinforce the middle case 4 itself. T-shaped ribs 46, 46,. The engine-side end of each T-shaped rib 46 extends from the inner side 43 of the distribution passage to the vicinity of the tip (engine-side end) of the first middle case-side joint portion 48 on the lower surface of the space K.

  In this case, as shown in FIG. 8, the lower case 2 is formed by rotating the lower case 2 in a predetermined direction (the direction of the solid arrow shown in FIG. 8) when the mold is extracted from the distribution passage upstream portion 21 during manufacture. The mold is extracted from the upstream side portion 21 of the distribution passage by rotating relative to 2 (rotating in the direction of the wavy arrow shown in FIG. 8).

  Therefore, in the said embodiment, the welding protrusion 25a and middle case of the lower case side junction part 25 in the outer side of the lower case side junction part 25 which continues the upper edge of the peripheral part of the lower case 2 and the middle case 4 along a joining line The partitioning portion 22d that protrudes upward perpendicular to the direction in which the protrusions 48a of the side joint portion 48 face each other secures a welded portion to the middle case side joint portion 48, and is welded to the middle case side joint portion 48. The screen 22d serves as a receiving surface. Therefore, T-shaped ribs 46, 46,... Extending from the inner wall 43 a of the middle case 4 to the inside and outside of the engine and extending to the vicinity of the front end of the middle case side joint portion 48 are partitioning portions. In addition to being received by 22d, when the lower case 2 and the middle case 4 are vibration welded, the tip (engine side end) of each T-shaped rib 46 is welded and fixed to the partition portion 22d. The rigidity of can be effectively increased.

  In addition, the partition burr 22d smoothly hides the welding burr G generated at the time of welding with the protrusion 48a of the middle case side joint 48, and the rib for hiding the welding burr G is provided on the lower case side joint. 25, it is not necessary to provide the outer side of the welding protrusion 25a of the lower case 25, so that the ribs near the welding protrusion 25a of the lower case side joining portion 25 are reduced, and the rib near the welding protrusion 25a of the lower case side joining portion 25 is reduced. It is possible to suppress the increase of sacrificial meat. Furthermore, welding burrs generated by vibration welding between the tips of the T-shaped ribs 46 and the partition portions 22d can also be blinded by the partition portions 22d.

  Further, since the space K between the upper wall 41a of the surge tank 41 and the port mounting flange 42 is shielded from the inside (engine side) by the screen portion 22d, the radiated sound is generated in the space K. Even if spatial resonance occurs, it is possible to effectively prevent the radiated sound (spatial resonance) from leaking out of the space K.

  Furthermore, the partition portion 22d is a rotational force acting portion that causes a rotational force to act when the mold is extracted from the upstream portion 21 of the distribution passage by rotating the lower case 2 in a predetermined direction (the direction indicated by the solid line in FIG. 8) during manufacture. And can be smoothly performed when the mold is extracted from the upstream portion 21 of the distribution passage.

  In addition, this invention is not limited to the said embodiment, The other various modifications are included. For example, in the above embodiment, the intake manifold 1 applied to an in-line four-cylinder engine has been described. However, the present invention is not limited to an in-line engine, and may be applied to an intake manifold such as a V-type engine.

  Further, in the above embodiment, the partition portion 22d protrudes outside the joint line of the lower case side joint portion 25 at the upper edge of the lower case 2, but the partition portion projects outside the joint line at the lower edge or the left and right side edges of the lower case. It may be provided.

It is the perspective view which looked at the intake manifold which concerns on embodiment of this invention from one side. It is the side view which looked at the intake manifold from the other side. It is the rear view which looked at the intake manifold from the engine side used as an inner side. It is the front view which looked at the intake manifold from the non-engine side used as the outside. It is a vertical side view of an intake manifold. It is a vertical side view which shows the welding state with the upper case and middle case in the lower case vicinity vicinity. It is a vertical side view which shows the welding state with the upper case side joining rod and middle case side joining rod in the lower case upper edge vicinity. It is a vertical side view of a lower case showing an operation procedure when a mold is extracted from a distribution passage upstream side portion.

Explanation of symbols

1 Intake manifold 2 Lower case (first divided body)
22 Lower case side joint (welded part)
22a Welding ridge (ridge)
22d Screen 25 Lower case side joint (welded part)
25a Welding ridge (ridge)
4 Middle case (second divided body)
41 Surge tank (Surge tank part)
42 Port mounting flange (port)
43 Distribution passage inner part (intake piping)
46 T-shaped rib (reinforcing rib)
47 Second middle case side welding rod (welded part)
47a Projection 48 Middle case side joint (welded part)
48a ridge G welding burr K space

Claims (3)

A resin intake manifold manufactured by joining the protrusions of the welded portions of the first and second divided bodies by vibration welding,
On the outer side of the ridges of the first divided body, the direction in which the ridges of the welded portions of the divided bodies face each other so as to conceal the welding burr generated at the time of welding with the ridges of the second divided body A resin intake manifold, characterized in that it is provided with a partition that protrudes in a direction perpendicular to it. The resin intake manifold according to claim 1,
The second divided body is provided with a surge tank section, a port section provided above the surge tank section, connected to the engine, and intake air from the surge tank section with respect to the port section. With intake piping that feeds around the side,
The partition portion is projected upward so as to shield a space formed between the surge tank portion, the port portion, and the intake pipe of the second divided body. Intake manifold. In the resin intake manifold according to claim 1 or 2,
A resin intake manifold, wherein the second divided body is provided with a reinforcing rib extending in a direction perpendicular to the partition portion so that an end surface thereof faces the partition portion.

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