JP2009074509A - Intake manifold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To firmly integrate respective components while constituting portions not requiring heat resistance so much by an inexpensive resin material with low heat resistance when resinifying an intake manifold. <P>SOLUTION: A surge tank part has a suction air intake port 11, an outlet cylinder part 22 communicated with the inside of the surge tank part, and a mounting part 15 mounted to an engine. A connection cylinder part 35 connected to a suction passage of the engine is provided in the mounting part 15. A suction pipe part 4 comprises a resin material having lower heat resistance than that of a resin material constituting the surge tank part. An upstream side connection part 41 connected to the outlet cylinder part 22 is formed on the upstream side of the suction pipe part 4, and a downstream side connection part 42 connected to the connection cylinder part 35 is formed on the downstream side of the suction pipe part 4. The outlet cylinder part 22 and the upstream connection part 41 are connected with each other with one press fitted to the other, and the connection cylinder part 35 and the downstream side cylinder part 42 are connected to each other with one press fitted to the other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an intake manifold for supplying intake air to a cylinder of an engine.

  Conventionally, as this kind of intake manifold, one formed by molding a resin material is known (see, for example, Patent Document 1). The intake manifold of Patent Document 1 includes a plurality of intake pipe portions that are respectively connected to engine cylinders, and a surge tank portion that is connected to an upstream end portion of the intake pipe portion. The downstream end of the intake pipe is connected to the engine intake passage while being attached to the engine so that intake air taken into the surge tank is drawn into the intake passage of the engine through the intake pipe. It has become.

A part of the surge tank part and the intake pipe part of this intake manifold is composed of two halved members, and the remaining part of the intake pipe part is a halved member different from the surge tank part. It is configured. These members are joined together by a welding method such as vibration welding after molding.
JP 2004-251176 A

  However, in the intake manifold of Patent Document 1, since the downstream end portion of the intake pipe portion is attached to the engine, the heat of the engine is directly transmitted to the downstream end portion of the intake pipe portion. Therefore, the resin material that forms at least the downstream end of the intake pipe portion needs to have heat resistance that can sufficiently withstand the heat of the engine, but such a heat resistant resin material is expensive.

  Further, when manufacturing a resin intake manifold as in Patent Document 1, it is necessary to divide and mold into a plurality of members, and then weld and integrate them into one another because of the die-cutting of the mold. . In this case, if the material of each member is different from each other, the welding strength cannot be secured sufficiently. Therefore, the part having a small thermal influence away from the engine is also made of the same high heat resistance resin material as the part attached to the engine. Must be molded. In other words, the entire intake manifold is molded from an expensive resin material, resulting in high costs.

  The present invention has been made in view of such a point, and the object of the present invention is to provide a heat-resistant portion where heat resistance is not so required when a plurality of resin members are combined to form an intake manifold. The object is to make it possible to firmly integrate the respective members while being composed of a low-priced resin material.

  In order to achieve the above object, according to the first aspect of the present invention, a resin surge tank portion and a resin intake pipe portion formed separately from the surge tank portion and connected to the surge tank portion are provided. An intake manifold, wherein the surge tank portion has an intake intake for taking intake air into the surge tank portion, an outlet cylinder portion communicating with the surge tank portion, and an attachment portion attached to the engine; The mounting portion is formed with a connecting cylinder portion connected to the intake passage of the engine, and the intake pipe portion is formed by molding a resin material having lower heat resistance than the resin material constituting the surge tank portion. The upstream connection part connected to the outlet cylinder part is formed on the upstream side of the intake pipe part, and the downstream connection part connected to the connection cylinder part is formed on the downstream side, and the outlet The tube and the upstream connection One of which is connected in a state of being pressed into the other, a structure in which one of the said connecting cylinder portion and the downstream side cylindrical portion are connected in a state of being pressed into the other.

  In a second invention, in the first invention, the surge tank portion is divided into a first divided body having an outlet tube portion and a second divided body having a mounting portion, and the first divided body and the second divided body. It is set as the structure welded with the division body.

  According to a third aspect, in the first or second aspect, a bellows portion having a bellows shape is formed between the upstream side connection portion and the downstream side connection portion of the intake pipe portion.

  According to a fourth invention, in any one of the first to third inventions, the outlet tube portion is press-fitted into the upstream connection portion, and is placed on one of the outer peripheral surface of the outlet tube portion and the inner peripheral surface of the upstream connection portion. Is configured such that a convex portion is formed and a concave portion that fits into the convex portion is formed on the other side.

  According to a fifth invention, in any one of the first to fourth inventions, the connection tube portion is press-fitted into the downstream connection portion, and is applied to one of the outer peripheral surface of the connection tube portion and the inner peripheral surface of the downstream connection portion. Is configured such that a convex portion is formed and a concave portion that fits into the convex portion is formed on the other side.

  According to the first aspect of the present invention, the surge tank part having an attachment part to the engine that requires high heat resistance and the intake pipe part connected to the outlet cylinder part and the connection cylinder part of the surge tank part are separated. In addition, since the intake pipe part is made of a resin material having lower heat resistance than the surge tank part, the material cost of the intake pipe part can be reduced, and the cost of the intake manifold can be reduced. Further, the outlet cylinder part of the surge tank part and the upstream connection part of the intake pipe part are connected by a press-fit structure, and the connection cylinder part of the surge tank part and the downstream connection part of the intake pipe part are connected by a press-fit structure. Therefore, the intake pipe portion can be integrated with the surge tank portion in an airtight and firm manner.

  According to 2nd invention, it can manufacture easily by dividing | segmenting a surge tank part into a 1st division body and a 2nd division body. In this case, when the relative position between the outlet tube portion and the connecting tube portion is slightly deviated within the tolerance range in a state where the first divided body and the second divided body of the surge tank portion are welded, the intake pipe Since the part is made of a resin material having low heat resistance, the shape of the intake pipe part is modified by heating, for example, and each connection part of the intake pipe part is easily connected to the outlet cylinder part and the connection cylinder part of the surge tank part and It can be securely connected.

  According to the third invention, the intake pipe portion can be easily deformed to connect each connection portion to the outlet tube portion and the connection tube portion of the surge tank portion.

  According to the fourth invention, in the state where the outlet cylinder portion of the surge tank portion is press-fitted into the upstream connection portion of the intake pipe portion, the concave portion formed on one side is fitted to the convex portion formed on the other side, The upstream connection part of the intake pipe part can be firmly connected to the outlet cylinder part.

  According to the fifth aspect, similarly to the fourth aspect, the downstream connection part of the intake pipe part can be firmly connected to the connection cylinder part of the surge tank part.

  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.

Embodiment 1 of the Invention
FIG. 1 is a view showing an intake manifold 1 according to Embodiment 1 of the present invention. The intake manifold 1 is mounted on an in-line four-cylinder engine and supplies intake air to each cylinder. As shown in FIGS. 2 to 4, the intake manifold 1 includes a resin surge tank portion 2 and four resin intake pipe portions 4, 4,... Separate from the surge tank portion 2. In the surge tank portion 2, intake pipe portions 4, 4,... Are assembled.

  The surge tank portion 2 is made of a resin material that can sufficiently withstand the heat of the engine, while the intake pipe portions 4, 4,... Have lower heat resistance than the resin material constituting the surge tank portion 2, and are at room temperature. Are made of a low-rigidity resin material. As a resin material which comprises the surge tank part 2, although the resin material which glass fiber mixed can be mentioned, for example, it is not limited to this.

  The surge tank portion 2 is formed long in the cylinder row direction (horizontal direction) of the engine, and a bending portion 10 that is bent downward is provided at one end portion in the longitudinal direction (left side in FIG. 1). As shown in FIGS. 5 and 6, an intake intake 11 for taking in intake air into the surge tank portion 2 is formed at the lower end of the curved portion 10, and a flange 12 is provided around the intake intake 11. Is formed. A throttle body (not shown) incorporating a throttle valve is attached to the flange 12. A plurality of insertion holes 16, 16,... Through which bolts (not shown) for fastening and fixing the throttle body are inserted are formed in the peripheral portion of the flange 12. These insertion holes 16, 16,... Are fitted with metal collars (not shown). Further, the surge tank portion 2 is provided with an attachment portion 15 attached to the engine.

  As shown in FIG. 1, the surge tank portion 2 includes a first divided body 20 that constitutes a substantially upper half portion thereof, and a second divided body 30 that constitutes a substantially lower half portion thereof. Are integrated by vibration welding. As shown in FIG. 4, the second divided body 30 is formed by integrally forming the second tank constituting portion 31, the attachment portion 15, and the flange 12. The second tank component 31 is long in the cylinder row direction and has a half shape that is open above the intake manifold 1. On the peripheral edge of the second tank component 31, a welding ridge 32 is formed over the entire circumference. As shown in FIG. 1, the attachment portion 15 has a plate shape that protrudes downward from the lower wall portion of the second tank constituting portion 31 and extends long in the longitudinal direction of the second tank constituting portion 31. The mounting portion 15 is along the fastening surface of the cylinder head H of the engine (shown in phantom lines in FIGS. 2, 3 and 6).

  In the attachment portion 15, four communication holes 33, 33,... Communicating with the upstream end portions of the four intake ports formed in the cylinder head H are formed at intervals in the longitudinal direction of the attachment portion 15. Yes. Around the communication hole 33, a groove 15a into which a sealing material (not shown) is fitted is formed. Further, a plurality of insertion holes 34, 34,... Through which bolts (not shown) for fastening and fixing the mounting portion 15 to the cylinder head H of the engine are inserted in the vicinity of the upper edge portion and the lower edge portion of the mounting portion 15. Is formed. Metal collars (not shown) are fitted into the insertion holes 34 of the attachment portion 15.

  Further, as shown in FIG. 4, the attachment portion 15 is formed with a connecting cylinder portion 35 that protrudes from the peripheral portion of each communication hole 33 to the side opposite to the cylinder head H side. A downstream side of the intake pipe portion 4 is connected to the connection cylinder portion 35. The connection cylinder part 35 has a substantially circular cross section. On the outer peripheral surface of the connecting tube portion 35, a flange portion 35a that protrudes radially outward and extends in the circumferential direction is formed. Further, a convex portion 35 b that protrudes radially outward and extends in the circumferential direction is formed on the distal end side of the flange portion 35 a on the outer peripheral surface of the connection cylinder portion 35. Further, a stepped portion 35c is formed on the outer peripheral surface of the connecting tube portion 35 on the distal end side with respect to the convex portion 35b, and the thickness on the distal end side of the connecting tube portion 35 is brought closer to the proximal end side by the stepped portion 35c. It is thinner than that. A tapered surface 35d is formed at the tip of the connecting tube portion 35 so as to be tapered.

  The first divided body 20 is formed by integrally forming a first tank constituting portion 21 and four outlet cylinder portions 22, 22,. The first tank constituting portion 21 is long in the cylinder row direction and has a halved shape opened downward, and is formed so as to cover the open side of the second tank constituting portion 31. On the peripheral edge of the first tank component 21, a ridge 23 is formed corresponding to the ridge 32 of the second tank component 31. Both protrusions 23 and 32 are vibration welded.

  Four openings 24, 24, ... are formed in the upper wall portion of the first tank constituting portion 21 at intervals in the longitudinal direction. The interval between the openings 24, 24,... Is set to be substantially the same as the interval between the connection tube portions 35, 35,. The outlet cylinder portion 22 protrudes outward from the surge tank portion 2 toward the upper side of the intake manifold 1 from the peripheral edge portion of each opening portion 24 of the first tank constituting portion 21. The axis of the outlet cylinder 22 and the axis of the connection cylinder 35 are substantially orthogonal when the surge tank 2 is viewed from the side. As shown in FIG. 9, a flange 22a, a convex portion 22b, a stepped portion 22c, and a tapered surface 22d are formed on the outer peripheral surface of the outlet cylindrical portion 22 as shown in FIG. .

  The four intake pipe portions 4, 4,... Have the same shape. Each intake pipe portion 4 is formed by blow-molding a resin material, and as shown in FIG. The upstream end portion of the intake pipe portion 4 is an upstream connection portion 41 connected to the outlet tube portion 22, and the downstream end portion is a downstream connection portion 42 connected to the connection tube portion 35. As shown in FIGS. 2 and 3, the intake pipe portion 4 is bent at an approximately 90 ° angle from the upstream connection portion 41 and extended at an approximately 90 ° angle from the first bent portion 43. The second bent portion 44 includes a second bent portion 44, a straight portion 45 extending straight from the second bent portion 44 to the lower side of the intake manifold 1, and a third bent portion 46 extending from the straight portion 45 by bending approximately 90 °. The linear portion 45 is formed with a bellows-shaped bellows portion 45a. The bellows portion 45 a makes it easy to bend between the second bent portion 44 and the third bent portion 46 of the intake pipe portion 4. In addition to blow molding, the intake pipe portion 4 can be obtained by bending after extrusion molding, for example.

  The upstream connection portion 41 has a larger diameter than the midway portion of the intake pipe portion 4. The inner diameter of the upstream connection portion 41 is set to be larger than the inner diameter of the outlet cylinder portion 22 and slightly smaller than the outer diameter. Therefore, the outlet cylinder part 22 is press-fitted into the upstream side connection part 41. As shown in FIG. 9, a concave portion 41 a into which the convex portion 22 b of the outlet tube portion 22 is fitted is formed on the inner peripheral surface of the upstream side connection portion 41 over the entire circumference. Further, a stepped portion 41b is formed on the inner peripheral surface of the upstream connecting portion 41 on the downstream side of the recessed portion 41a.

  The downstream connection portion 42 has a larger diameter than the midway portion of the intake pipe portion 4, similarly to the upstream connection portion 41. The inner diameter of the downstream connection portion 42 is set to be larger than the inner diameter of the connection cylinder portion 35 and slightly smaller than the outer diameter. Therefore, the connection cylinder part 35 is press-fitted into the downstream side connection part 42. Although not shown, on the inner peripheral surface of the downstream connection portion 42, similarly to the upstream connection portion 41, a concave portion 42 a into which the convex portion 35 b of the connection cylinder portion 35 fits and a step portion 42 c are formed.

  Next, the case where the intake manifold 1 comprised as mentioned above is manufactured is demonstrated. First, the first divided body 20 and the second divided body 30 are obtained by injection molding a resin material. Further, the resin material is blow-molded to obtain four intake pipe portions 4, 4,. Thereafter, the first divided body 20 and the second divided body 30 are set in a vibration welding machine (not shown), and the protrusions 23 and 32 of both the members 20 and 30 are butted together, for example, the second divided body. The body 30 is fixed, the first divided body 20 is vibrated, and both the protrusions 23 and 32 are melted. When the vibration is stopped in this state, the peripheral edge portion of the first tank constituting portion 21 of the first divided body 20 and the peripheral edge portion of the second tank constituting portion 31 of the second divided body 30 are welded to each other. And the second divided body 30 are integrated in an airtight manner. At this time, since the first divided body 20 and the second divided body 30 are the same resin material, they are firmly welded.

  After that, the intake pipe portions 4, 4,... Are assembled to the surge tank portion 2. First, after the upstream connection portion 41 and the downstream connection portion 42 of the intake pipe portion 4 are heated, the outlet cylinder portion 22 of the surge tank portion 2 is press-fitted into the upstream connection portion 41 of the intake pipe portion 4. At the same time, the connecting cylinder part 35 is press-fitted into the downstream side connecting part 42. Thereafter, when the upstream connection portion 41 and the downstream connection portion 42 of the intake pipe portion 4 return to room temperature, the intake pipe portion 4 contracts, and the inner peripheral surface of the upstream connection portion 41 comes into close contact with the outer peripheral surface of the outlet tube portion 22, and The inner peripheral surface of the connection portion 42 is in close contact with the outer peripheral surface of the connection cylinder portion 35. As a result, the intake pipe portion 4 is airtightly and firmly fixed to the surge tank portion 2.

  Since the tapered surfaces 22d and 35d are formed on the outlet cylinder part 22 and the connection cylinder part 35 during press-fitting, the outlet cylinder part 22 and the connection cylinder part 35 are easily inserted into the upstream connection part 41 and the downstream connection part 42. It is possible to go.

  Moreover, since the 1st division body 20 in which the exit cylinder part 22 was integrally molded is welded to the 2nd division body 30 in which the connection cylinder part 35 was integrally molded, the connection cylinder part 35 and the exit cylinder part 22 are welded. The relative position may be slightly deviated within the tolerance range. In this case, since the intake pipe portion 4 is formed of a resin material having low rigidity, and the bellows portion 45a is formed in the intake pipe portion 4, the intake pipe portion 4 can be easily deformed with a small force. Thus, it is possible to correct the shape so as to correspond to the positional deviation between the connecting tube portion 35 and the outlet tube portion 22. The shape correction of the intake pipe portion 4 may be performed after the intake pipe portion 4 is heated.

  Further, when the outlet tube portion 22 is inserted deeply into the upstream connection portion 41, the convex portion 22b of the outlet tube portion 22 fits into the concave portion 41a of the upstream connection portion 41, and the upstream connection portion 41 and the outlet tube portion 22 Is sufficiently secured, and the outlet cylinder 22 is more difficult to come off. Similarly, when the connecting cylinder part 35 is also inserted deeply into the downstream connecting part 42, the convex part 35b of the connecting cylinder part 35 fits into the concave part 42a of the downstream connecting part 42, and the downstream connecting part 42, the connecting cylinder part 35, Is sufficiently secured, and the connecting tube portion 35 is more difficult to come off.

  In addition, you may abbreviate | omit the convex part 22b of the exit cylinder part 22, and the recessed part 41a of the upstream connection part 41. FIG. Further, only the concave portion 41a of the upstream side connection portion 41 may be omitted. In this case, when the upstream side connection portion 41 of the intake pipe portion 4 returns to normal temperature, the convex portion 22b of the outlet tube portion 22 is inhaled. It comes to bite into the inner peripheral surface of the upstream side connection part 41 of the pipe part 4, and a sealing performance improves. The same applies to the concave portion 42 a of the downstream connection portion 42 and the convex portion 35 b of the connection cylinder portion 35.

  Further, the flange portion 22a formed on the outlet cylinder portion 22 functions as a stopper, so that the press-fitting depth of the outlet cylinder portion 22 can be made appropriate. Similarly, the flange portion 35a formed in the connecting cylinder portion 35 functions as a stopper. Reference numeral 39 shown in FIG. 9 is a seal member for sealing between the outlet tube portion 22 and the upstream side connection portion 41, but this seal member 39 may or may not be provided.

  As described above, according to the intake manifold 1 according to the first embodiment, the surge tank portion 2 having the engine mounting portion 14 and the intake pipe portion 4 are separated, and the intake pipe portion 4 is connected to the surge tank. Since the outlet tube portion 22 and the connecting tube portion 35 of the portion 2 are connected, the intake pipe portion 4 does not directly contact the engine. Thereby, since the intake pipe part 4 can be comprised with the resin material whose heat resistance is lower than the surge tank part 2, the material cost of the intake pipe part 4 can be reduced, and also the cost reduction of the intake manifold 1 can be aimed at. . Furthermore, since the surge tank portion 2 and the intake pipe portion 4 are connected by a press-fitting structure, the intake pipe portion 4 can be hermetically and firmly fixed to the surge tank portion 2.

  Further, when the relative position between the outlet cylinder part 22 and the connection cylinder part 35 is slightly deviated within the tolerance range in a state where the first divided body 20 and the second divided body 30 of the surge tank part 2 are welded. In addition to the fact that the intake pipe portion 4 is made of a resin having low heat resistance, the intake pipe portion 4 is formed with a bellows portion 45a. It is possible to connect to the outlet cylinder part 22 and the connection cylinder part 35.

  In the first embodiment, the outlet cylinder part 22 is press-fitted into the upstream connection part 41 after the connection cylinder part 35 of the surge tank part 2 is press-fitted into the downstream connection part 42 of the intake pipe part 4. Alternatively, the connection cylinder part 35 may be press-fitted into the downstream connection part 42 after the outlet cylinder part 22 is press-fitted into the upstream connection part 41.

  Moreover, a recessed part may be formed in the outer peripheral surface of the exit cylinder part 22, and a convex part may be formed in the inner peripheral surface of the upstream connection part 41, or a recessed part may be formed in the outer peripheral surface of the connection cylinder part 35, and the downstream side A convex portion may be formed on the inner peripheral surface of the connecting portion 42.

  Further, the upstream side connection portion 41 of the intake pipe portion 4 may be press-fitted into the outlet cylinder portion 22, or the downstream side connection portion 42 of the intake pipe portion 4 may be press-fitted into the connection cylinder portion 35. .

  Further, the bellows portion 45a of the intake pipe portion 4 may be omitted.

  Further, without heating the upstream connection part 41 and the downstream connection part 42 of the intake pipe part 4, the outlet cylinder part 22 is press-fitted into the upstream connection part 41, and the connection cylinder part 35 is press-fitted into the downstream connection part 42. May be. In this case, a seal member 39 is provided between the outlet tube portion 22 and the upstream connection portion 41, and a seal member (not shown) is similarly provided between the connection tube portion 35 and the downstream connection portion 42. Provide. Furthermore, the sealing portion is secured by fitting the convex portion 22b of the outlet cylindrical portion 22 into the concave portion 41a of the upstream connecting portion 41, and the convex portion 35b of the connecting cylindrical portion 35 is fitted into the concave portion 42a of the downstream connecting portion 42. Sealability is ensured.

<< Embodiment 2 of the Invention >>
10 and 11 show an intake manifold 1 according to Embodiment 2 of the present invention. The intake manifold 1 differs from that of the first embodiment in the shape of the surge tank portion 2 and the shape of the intake pipe portion 5, and hereinafter, the same portions as those in the first embodiment are denoted by the same reference numerals. Is omitted.

  The intake intake 11 side in the surge tank portion 2 extends in the cylinder row direction longer than that in the first embodiment. As shown in FIG. 11, the outlet cylinder portion 22 of the first divided body 20 is positioned closer to the intake intake 11 side than the connection cylinder portion 35 as a whole. These outlet cylinder portions 22 are formed so as to project obliquely toward the opposite side of the intake manifold 1 from the intake intake 11 side.

  The intake pipe portion 5 includes a U-shaped portion 53 that bends in a U-shape from the upstream connection portion 51, a straight portion 54 that extends substantially horizontally from the U-shaped portion 53 toward the connecting tube portion 35, and a straight line And a bent portion 55 that is bent by approximately 90 ° from the portion 54 toward the attachment portion 15 and extends to the downstream connection portion 52.

  When manufacturing the intake manifold 1 of the second embodiment, first, the first divided body 20 and the second divided body 30 are welded and integrated. Then, when the intake pipe portion 5 is assembled to the surge tank portion 2, after the connection pipe portion 35 is press-fitted into the downstream side connection portion 52, the entire intake pipe portion 5 is connected to the connection pipe portion as shown by the arrow in FIG. 35, the outlet cylinder portion 22 is inserted into the upstream connection portion 51 and press-fitted. Although no bellows portion is formed in the intake pipe portion 5, a bellows portion similar to the intake pipe portion 4 of the first embodiment may be formed.

  Therefore, also in the second embodiment, the surge tank part 2 having the attachment part 15 and the intake pipe part 5 are separated, and the intake pipe part 5 is made of a resin material having lower heat resistance than the surge tank part 2. Therefore, the cost of the intake manifold 1 can be reduced. Furthermore, since the surge tank portion 2 and the intake pipe portion 5 are connected by a press-fitting structure, the intake pipe portion 5 can be hermetically and firmly fixed to the surge tank portion 2.

  The upstream connection part 51 of the intake pipe part 5 may be press-fitted into the outlet cylinder part 22, or the downstream connection part 52 may be press-fitted into the connection cylinder part 35.

  Although not shown, after changing the shapes of the outlet cylinder part 22 and the connection cylinder part 35 and press-fitting the upstream connection part 51 into the outlet cylinder part 22, the intake pipe part 5 is moved around the axis of the outlet cylinder part 22. You may make it rotate and insert the downstream connection part 52 in the connection cylinder part 35, and may press-fit. Moreover, the upstream connection part 51 and the downstream connection part 52 of the intake pipe part 5 may be heated before press-fitting, or may not be heated. When the upstream side connection part 51 and the downstream side connection part 52 are not heated, similarly to the first embodiment, convex portions are provided on the outer peripheral surfaces of the outlet cylinder part 22 and the connection cylinder part 35, and the upstream side connection part 51 and the downstream side part are provided. It is preferable to provide a concave portion on the inner peripheral surface of the side connection portion 52 and further provide a sealing material.

  Further, the upstream connection portion 51 of the intake pipe portion 5 may be press-fitted into the outlet cylinder portion 22, or the downstream connection portion 52 of the intake pipe portion 5 may be press-fitted into the connection cylinder portion 35. .

  In the first and second embodiments, the case where the present invention is applied to the intake manifold 1 for an in-line four-cylinder engine has been described. However, the present invention is not limited to this, and the present invention can be applied to a horizontally opposed engine or a V-type engine. It can be applied to other intake manifolds. Further, the number of cylinders is not limited to four.

  The surge tank 2 may be divided into three or more members and welded together.

  Further, the shape and length of the intake pipe portions 4 and 5 can be arbitrarily set.

  As described above, the intake manifold according to the present invention can be used, for example, in an intake system of an in-line four-cylinder engine.

It is the front view which looked at the intake manifold which concerns on Embodiment 1 from the attachment part side. It is a right view of an intake manifold. It is a left view of an intake manifold. It is a disassembled perspective view of an intake manifold. It is a rear view of a surge tank part. It is a bottom view of an intake manifold. It is a top view of an intake manifold. It is a side view of an intake pipe part. It is an expanded sectional view of an outlet pipe part and an upstream connection part before connection. 6 is a rear view of an intake manifold according to Embodiment 2. FIG. It is a figure explaining the point which attaches an intake pipe part to a surge tank part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Intake manifold 2 Surge tank part 4, 5 Intake pipe part 11 Intake inlet 15 Attachment part 20 1st division body 22 Outlet cylinder part 22b Convex part 30 2nd division body 35 Connection cylinder part 41, 51 Upstream connection part 41a Concave part 45a Bellows part 42, 52 Downstream side connection part

Claims (5)

A resin surge tank part and an intake manifold that is formed separately from the surge tank part and includes a resin intake pipe part connected to the surge tank part,
The surge tank part has an intake inlet for taking intake air into the surge tank part, an outlet cylinder part communicating with the surge tank part, and an attachment part attached to the engine. A connecting cylinder connected to the intake passage of the engine is formed,
The intake pipe portion is formed by molding a resin material having lower heat resistance than the resin material constituting the surge tank portion, and an upstream connection connected to the outlet cylinder portion is upstream of the intake pipe portion. Part is formed, on the downstream side, a downstream side connection part connected to the connection cylinder part is formed,
One of the outlet tube portion and the upstream connection portion is connected in a state where it is press-fitted into the other, and one of the connection tube portion and the downstream tube portion is connected in a state where it is press-fitted into the other. Intake manifold characterized by Intake manifold according to claim 1,
The surge tank part is divided into a first divided body having an outlet cylinder part and a second divided body having an attachment part,
The intake manifold, wherein the first divided body and the second divided body are welded. Intake manifold according to claim 1 or 2,
An intake manifold, wherein a bellows portion having a bellows shape is formed between an upstream side connection portion and a downstream side connection portion of the intake pipe portion. The intake manifold according to any one of claims 1 to 3,
The outlet cylinder is press-fitted into the upstream connection,
A convex portion is formed on one of the outer peripheral surface of the outlet tube portion and the inner peripheral surface of the upstream connection portion, and a concave portion that fits the convex portion is formed on the other. Intake manifold. The intake manifold according to any one of claims 1 to 4,
The connecting cylinder is press-fitted into the downstream connecting part,
A convex portion is formed on one of the outer peripheral surface of the connecting tube portion and the inner peripheral surface of the downstream connecting portion, and a concave portion that fits the convex portion is formed on the other. Intake manifold.

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