JP2001115912A - Resin hollow structure for intake system of internal combustion engine - Google Patents

Abstract

(57) [Problem] To provide a resin hollow structure for an intake system of an internal combustion engine capable of improving pressure resistance. A manifold body constituting a resin member of a resin intake manifold has four pieces (20, 20).
21) and are integrally formed by bonding and joining the pieces by vibration welding. The first and second pieces 20 and 21 that constitute the peripheral wall of the surge tank 15 are not only divided surfaces 26 and 27 around the first and second pieces 20 and 21 but also further joined surfaces 33 provided at portions offset from the divided surfaces 26 and 27. , 35 are also bonded together.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine such as an intake manifold, a surge tank, or a resonator provided in an intake system of an internal combustion engine and having a hollow portion therein. The present invention relates to a resin hollow structure for an engine intake system.

[0002]

2. Description of the Related Art An intake system of an internal combustion engine is provided with a hollow structure, such as an intake manifold, a surge tank, a resonator, or the like, having a hollow portion into which intake air flowing through an intake passage is introduced. . Conventionally, as such a hollow structure of an intake system for an internal combustion engine, a resin hollow structure formed of a resin member has been used in order to reduce the weight of the hollow structure and improve productivity.

As shown in, for example, JP-A-8-4607 and JP-A-8-252864, a resin member constituting an intake manifold and a surge tank integrated therewith is divided into a plurality of pieces. There is known an intake manifold integrated with a resin surge tank formed by laminating and joining the divided surfaces around the pieces as joining surfaces by vibration welding or the like.

[0004] In this way, if each piece is formed by bonding and joining the divided surfaces on the periphery thereof, a resin hollow such as the above-mentioned resin surge tank integrated type intake manifold having a hollow portion therein can be obtained. Even structures can be easily manufactured.

[0005]

However, in the resin hollow structure formed as described above, as described below,
It has been difficult to ensure sufficient pressure resistance as required.

In such a hollow structure of an intake system of an internal combustion engine, the internal pressure of the hollow portion becomes temporarily high due to backfire or the like during operation of the engine, and the peripheral wall of the hollow portion may be deformed so as to expand. . For this reason, it is necessary for the hollow structure of the intake system of the internal combustion engine to have a sufficiently high pressure resistance enough to withstand an increase in the internal pressure during backfire.

In particular, in a surge tank provided near a cylinder, since the internal pressure rises remarkably due to backfire, the required pressure resistance naturally increases. However, as described above, if only the divided surface around each piece is bonded and bonded as a bonding surface, when the deformation of each piece occurs due to such a pressure increase, stress concentrates on the bonding portion around the piece, and the piece is concentrated. The bonding strength between them may be insufficient. For this reason, it is difficult for the resin hollow structure formed as described above to secure sufficient pressure resistance to withstand a large increase in internal pressure during backfire.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a resin hollow structure for an intake system of an internal combustion engine, which can improve pressure resistance.

[0009]

The means for achieving the above object and the effects thereof will be described below. The invention according to claim 1 divides a resin member which is provided in an intake system of an internal combustion engine and forms a hollow structure having a hollow portion therein into a plurality of pieces, and divides the pieces into peripheral divided surfaces. In a resin hollow structure for an intake system of an internal combustion engine formed by bonding and joining as a joining surface, a further joining surface is formed on the piece at a position offset from the division surface.

In the structure of the first aspect, a plurality of pieces are bonded and joined to form a resin hollow structure having a hollow portion therein and provided in an intake system of an internal combustion engine. At the time of this bonding, the pieces are bonded together not only with the divided surfaces of the pieces being used as bonding surfaces, but also with the additional bonding surface formed at a portion offset from the divided surface. Become like

As a result, the area of the bonded portion between the pieces is increased by the additional bonding surface, and the pieces are bonded more firmly. In addition, since the divided surface around the piece which has been set as the joining surface and the further joining surface are provided at offset portions,
Due to the deformation of the pieces due to the increase of the internal pressure of the hollow portion due to the backfire or the like, the moment applied to the joint between the pieces is dispersed, and the stress applied to the joint is reduced.

Therefore, according to the first aspect of the present invention, the pressure resistance of the resin hollow structure of the intake system of the internal combustion engine can be improved. Further, the invention according to claim 2 divides a resin member which is provided in an intake system of an internal combustion engine and constitutes a hollow structure having a hollow portion therein into a plurality of pieces, and divides the pieces into peripheral pieces. In the resin hollow structure of the internal combustion engine intake system formed by bonding and bonding the surfaces as bonding surfaces, a further bonding surface is formed on the piece at a portion inside the piece with respect to the surrounding divided surface. Like that.

In the structure according to the second aspect of the present invention, when the pieces are bonded and bonded, not only the divided surfaces of the pieces are bonded and bonded, but also the pieces are formed on the inner side of the pieces with respect to the surrounding divided surfaces. The bonding is performed on the further bonded surface.

As a result, the area of the bonded portion between the pieces is increased by the additional bonding surface, and the pieces are bonded more firmly. In addition, the pressure acting on the piece when the internal pressure of the hollow portion rises is also supported in the portion where the further joint surface is formed inside the piece, so that the deformation of the piece can be more suitably suppressed. Become.

Therefore, according to the second aspect of the invention, it is possible to improve the pressure resistance of the resin hollow structure of the intake system of the internal combustion engine. According to a third aspect of the present invention, in the resin hollow structure of the internal combustion engine intake system according to the second aspect, the further joint surface faces inward from the joint surface of the divided surface around the piece. And stretch it.

In the structure according to the third aspect, the further joint surface provided inside the piece extends from the joint surface of the divided surfaces around the piece and is formed integrally. For this reason,
At the same time as applying the surface pressure between the joint surfaces and the small relative displacement between the joint surfaces required for laminating to the joint surface of the divided surface around the piece, also to the additional joint surface inside the piece Will be able to For this reason, even when it is difficult to directly apply a surface pressure or a small relative displacement between the further joining surfaces on the inside of the piece, the further joining surfaces can be easily bonded and joined. Become.

Therefore, according to the third aspect of the present invention, it is possible to more easily manufacture a resin hollow structure for an intake system of an internal combustion engine, which can improve the pressure resistance.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a resin hollow structure for an intake system of an internal combustion engine according to the present invention.

The present embodiment relates to a resin surge tank integrated type intake manifold (hereinafter, simply referred to as “resin intake manifold”) in which a surge tank and an intake manifold of an internal combustion engine are integrally formed by a resin member. Such a resin hollow structure for an intake system of an internal combustion engine is applied.

The resin intake manifold has a hollow structure having a hollow portion inside. A surge tank having a predetermined capacity, a plurality of branch pipes (intake manifolds) branched to communicate the surge tank with the respective intake ports of the internal combustion engine, and a negative pressure actuator are operated therein. A plurality of hollow portions such as a pressure accumulating chamber provided for accumulating a negative pressure are formed.

Incidentally, the resin intake manifold of the present embodiment is applied to an in-line four-cylinder internal combustion engine, and is provided with eight branch pipes for connection to two intake ports of each cylinder. .

First, the structure of a manifold body 10 which is a resin member constituting the resin intake manifold will be described with reference to FIGS. FIG. 1 shows a side structure of the manifold body 10.

As shown in FIG. 1, the manifold body 10 is provided with a suction pipe 11 so as to protrude to the side. A throttle flange 11a for connecting to a throttle body (not shown) of the engine intake system is provided at the tip of the suction pipe 11. The flange 1
1a is provided with a suction port 11b communicating with the inside of the manifold body 10. Also, the manifold body 1
A port-side flange 12 for connecting to an intake port of the internal combustion engine is formed in an upper portion of the cylinder.

On the other hand, on the outer peripheral surface of the front cover 13 which covers the front of the manifold body 10,
Are formed to reinforce the ribs. FIG. 2 shows a side sectional structure of the manifold body 10.

As shown in FIG. 2, the manifold body 10 has a hollow structure, in which hollow parts such as a surge tank 15, a branch pipe 16, and a pressure accumulating chamber 17 are defined.

The suction port 11b of the throttle flange 11a communicates with the surge tank 15. The surge tank 15 is a tank having a predetermined capacity as described above, and is defined between the front cover 13 and a partition wall 18 provided inside the manifold body 10.

An opening 19 communicating with each branch pipe 16 is formed in a lower portion of the surge tank 15. Each branch pipe 16 extends around the rear part of the manifold body 10 from the opening 19 below the surge tank 15, extends upward, and is connected to the port-side flange 12.

Thus, the intake air flowing into the surge tank 15 from the intake port 11b of the throttle flange 11a is distributed and supplied to the branch pipes 16 through the openings 19 provided at the lower part of the tank 15. .

A pressure accumulating chamber 17 is formed between the partition wall 16 and the branch pipe 16 forming the rear peripheral wall of the surge tank 15. The pressure accumulating chamber 17 is provided for accumulating a negative pressure as described above.

FIG. 3 shows an exploded structure of the front part of the manifold body 10. As shown in FIG. 3, the manifold body 10 is mainly formed by dividing into four pieces 20 to 23. Each of these pieces 20 to 23 is made of a synthetic resin material formed by injection molding or the like.

First, the first piece 20 mainly forms the suction pipe 11 and the front cover 13. In the first piece 20, the opening 19 of each of the branch pipes 16 and the lower part 24, which is the upstream part thereof, are formed in a wavy cross section.

On the other hand, the second piece 21 is mainly
8. Further, the lower part 25 of the second piece 21 is formed in a wavy cross section, and in combination with the lower part 24 of the first piece 20 also formed in a wavy cross section, the opening 19 of the branch pipe 16 and The upstream part is formed.

Further, the third piece 22 mainly constitutes a part of the outer wall of the intake port side flange 12 and each branch pipe 16. In the third piece 22, each of the branch pipes 16
A part of the outer wall is formed in a wavy cross section.

The fourth piece 23 mainly constitutes the remaining part of the outer wall of the branch pipe 16. This fourth piece 2
3 is formed in a wavy cross section, and the third piece 22
In combination with the above, a plurality of conduits forming the middle part to the downstream part of each branch pipe 16 are formed.

Then, these four pieces 20 to 23 are bonded and joined by vibration welding, respectively, and are integrated to form the manifold body 10. Incidentally, in the present embodiment, the manifold body 1 is
0 is assembled.

That is, first, (Ia) the first and second pieces 20 and 21 are bonded together so as to mainly form a portion forming the surge tank 15 of the manifold body 10. At the same time, (Ib) the third and fourth pieces 22 and 23 are bonded together so as to mainly form a portion forming the branch pipe 16 of the manifold body. And then (II) the joined first and second pieces 2
0, 21 and the third and fourth pieces 22, 23 are further bonded and joined. In this manner, the manifold body 10 constituting the resin member of the resin intake manifold is integrally assembled.

Next, the resin hollow structure of the intake system of the internal combustion engine according to the present embodiment will be described in detail with reference to FIGS.

As shown in FIG. 3, each of the pieces 20 to 23
Are bonded together by vibration welding using the divided surfaces 26 to 31 around them as bonding surfaces. For example, the bonding bonding of the third piece 22 and the fourth piece 23
This is performed by joining the divided surface 30 and the divided surface 31 around them as joining surfaces, and abutting the two surfaces 30 and 31 to each other and performing vibration welding.

However, the first piece 20 and the second piece 21
And the second piece 21 and the third piece 22 as described below, in addition to the above-described divided surfaces 26 to 29 around the pieces 20 to 22 as described below. , By providing an “additional joining surface”
The pressure resistance of the manifold body 10 is improved.

First, regarding the bonding of the first piece 20 and the second piece 21, the pieces 20, 21
A further joint surface is provided at a position offset from the divided surfaces 26 and 27 around the periphery.

FIG. 4 shows the first and second pieces 20,
21 schematically shows a partial partial cross-sectional structure of FIG. 21, in which (a) schematically shows an aspect before bonding and bonding, and (b) schematically shows an aspect after bonding and bonding. FIG. 5 schematically shows a planar partial cross-sectional structure of the two pieces 20 and 21.

As shown in FIGS. 4 and 5, a concave portion 32 is formed on the upper surface of the front cover 13 of the first piece 20 so as to be partially depressed downward. This first piece 2
In FIG. 0, the “further joining surface” 33 is provided behind the concave portion 32 on the rear side of the manifold body 10.

On the other hand, the second piece 21 has
From the front side of the manifold body 10
A projection 34 projecting in the vertical direction is formed. In the second piece 21, the front end face 35 of the manifold body 10 of the projection 34 is the “further joining surface”.

These two "further joining surfaces" 33, 35
When the divided surfaces 26 and 27 around the pieces 20 and 21 abut against each other, they are formed so as to abut each other. Then, the first and second pieces 20, 21 are separated from each other by vibration welding and bonding between the “further bonding surfaces” 33, 35 as well as between the dividing surfaces 26, 27. 26, 27, and its dividing surface 2
Even at a position offset from 6, 27, it is bonded and joined.

Further, in the present embodiment, the bonded joint portions by these “further joint surfaces” 33 and 35 are bolts 3
6 and are more firmly joined. As a result, the area of the bonded portion of the two pieces 20 and 21 is increased, and the moment applied to the bonding surface when the two pieces 20 and 21 are deformed due to an increase in the internal pressure of the surge tank 15 due to backfire or the like is dispersed. become,
The stress applied to the bonded joint is reduced. Further, the front cover 13 is provided with “an additional joint surface” 33,3.
By supporting with the joint part by 5, the deformation can be suppressed, so that the stress acting on the bonded joint part can be reduced.

On the other hand, the bonding of the second and third pieces 21 and 22 is performed in addition to the divided surfaces 28 and 29 around the two pieces 21 and 22 and the divided surfaces 28 and 29.
A “further joining surface” is provided in a portion inside each of the pieces 21 and 22.

FIG. 6A schematically shows the rear structure of the second piece 21, and FIG. 6B schematically shows the front structure of the third piece 22. As shown in FIGS. 11A and 11B, the two sides of the second and third pieces 21 and 22 are separated from the divided surfaces 28 and 29 around the pieces 21 and 22, respectively. "Further joining surfaces" 37, 38 are formed to extend inward. Then, the divided surfaces 28 and 29 around each of the pieces 21 and 22 are joined and bonded by vibration welding, and at the same time, the “further joined surfaces” 37 and 38 are also bonded and joined. 22 is a dividing surface 28 around the
In addition to the parts 29, the inner parts of the pieces 21 and 22 are also bonded and joined.

As a result, the area of the bonding portion is increased, and the partition wall 18 on which pressure acts when the internal pressure of the surge tank 15 is increased by backfire or the like is removed from the portion where the “further bonding surfaces” 37 and 38 are formed. Thereby, it can be supported from behind, and the deformation can be more suitably suppressed.

Further, in the present embodiment, such "further joining surfaces" 37, 38 extend from the divided surfaces 28, 29 around the respective pieces 21, 22. Vibration welding can be performed simultaneously between the “further joining surfaces” 37 and 38.

According to the above-described resin hollow structure for the intake system of the internal combustion engine of the present embodiment, the following effects can be obtained. (1) In the present embodiment, the first piece 20 and the second piece 21 constituting the peripheral wall of the surge tank 15 in the manifold body 10 are divided into the divided surfaces 2 around the pieces 20 and 21.
In addition to the portions 6 and 27, the portions further offset from the split surfaces 26 and 27 are bonded to each other by using “further joining surfaces” 33 and 35 as joining surfaces. Therefore, the area of the bonded portion between the pieces 20 and 21 is increased by the amount of the “further bonding surface” 33 and 35, and the internal pressure of the surge tank 15 is increased by backfire or the like. Upon deformation, the pieces 20, 21
The moment applied to the joint portion between them can be dispersed, and the stress applied to the joint portion can be reduced. Therefore, the pressure resistance of the manifold main body 10 constituting the resin member in the resin intake manifold can be improved.

(2) In the present embodiment, the second piece 21 and the third piece 22 are divided by the pieces 21 and 22 from the divided faces 28 and 29 around the pieces 21 and 22, respectively. "Further joint surface" provided inside
37 and 38 are bonded to each other as bonding surfaces.
Therefore, the area of the bonded joint between the two pieces 21 and 22 increases, and the pressure acting on the partition wall 18 when the internal pressure of the surge tank 15 increases increases the “further joint surface”.
The joints 37 and 38 can also be supported, and the deformation of the pieces 21 and 22 can be more appropriately suppressed. Therefore, the pressure resistance of the manifold main body 10 constituting the resin member in the resin intake manifold can be improved.

(3) In the present embodiment, the “further joining surfaces” 37 and 38 provided inside the second and third pieces 21 and 22 are combined with the divided faces 28 around the pieces 21 and 22. It extends from 29 to the inside. For this reason, the surface pressure between the joint surfaces and the minute relative displacement between the joint surfaces required for the vibration welding of the two pieces 21 and 22 are reduced by the divided surfaces 28 and 29 around the pieces 21 and 22.
At the same time as the “further joint surface” 3
7, 38 can also be given. For this reason, even when it is difficult to directly apply a surface pressure or a minute relative displacement between the “further joining surfaces” 37 and 38, the joining can be easily performed by vibration welding. Therefore, a resin intake manifold capable of improving the pressure resistance can be more easily manufactured.

The above-described resin hollow structure for the intake system of the internal combustion engine according to the present embodiment can be modified as follows. In the above embodiment, the first piece 20 and the second piece 2
In FIG. 1, "further joining surfaces" 33, 35 formed at portions offset from the divided surfaces 26, 27 around them.
Are further fastened by bolts 36, but merely by "the further joining surfaces" 33, 3
It is possible to improve the pressure resistance by simply bonding and bonding the five members.

In the above embodiment, the manifold body 10, which is a resin member constituting the resin intake manifold, is divided into four pieces 20 to 23. However, the manner in which the manifold body 10 is divided is arbitrary. If at least two or more pieces are divided and the divided surfaces around the pieces are bonded and bonded as a bonding surface, each of the above “further bonding surfaces” 33, 35, 3
By further providing the same bonding surface as that of 6, 37, the pressure resistance can be similarly enhanced.

In the above embodiment, in the second piece 21 and the third piece 22, the “further joining surfaces” 37, 38 formed inside the pieces 21, 22 are divided into pieces around the pieces 21, 22. It extends from the surfaces 28 and 29 toward the inside of the piece. However, if lamination bonding is possible, these "further bonding surfaces" 37, 38
May be provided separately from the surrounding divided surfaces 28 and 29.

In the above embodiment, the first piece 20 and the second piece 21 are provided with “further joining surfaces” 33, 35 at portions offset from the divided surfaces 26, 27 around them, and the second piece 21 and the second piece 21 are provided. The third piece 22 is provided with “further joining surfaces” 37 and 38 at portions inside the pieces 21 and 22 with respect to the surrounding divided surfaces 28 and 29. These "further joining surfaces" 33, 35, 37, 38
Is provided for bonding and joining the pieces 20 to 22 that directly receive the pressure in the surge tank 15, so that the pressure resistance can be more effectively improved. Even if you set up for
It is possible to improve the pressure resistance.

In the above embodiment, the resin intake manifold is provided with “further joining surfaces” 33, 35 formed at portions offset from the divided surface around the piece, and inside the piece from the divided surface around the piece. Although both the formed “further joining surfaces” 36 and 37 are provided, only one of them may be provided.

In the above embodiment, each piece 20 to 23
Are bonded by vibration welding, but the same effect as in the above embodiment can be obtained by bonding and bonding by other means such as spinning welding, hot plate welding, or bonding using an adhesive. Can be obtained.

In the above-described embodiment, the surge tank-integrated resin intake in which the surge tank and the intake manifold (branch pipe) are integrally formed with the structure for strengthening the pressure resistance using the above “further joint surfaces”. The case where the present invention is applied to the manifold has been described. Such a structure for strengthening the pressure resistance,
Although it is more effective to apply it to a resin surge tank or a resin intake manifold integrated with a surge tank in which the internal pressure rises remarkably due to backfire, other internal combustion engines such as a single resin surge tank or a resin resonator The present invention can also be applied to a resin hollow structure of an intake system. In short, the resin member that constitutes the resin hollow structure that is provided in the intake system of the internal combustion engine and has a hollow portion inside is divided into a plurality of pieces, and these pieces are pasted with the surrounding divided surface as the joining surface. If it is a resin hollow structure of the internal combustion engine intake system formed by joining and joining,
By providing the above-mentioned "further joining surfaces" for bonding and joining the pieces, the pressure resistance can be improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a side structure of a manifold body of an embodiment embodying a resin hollow structure of an intake system of an internal combustion engine of the present invention.

FIG. 2 is a cross-sectional view showing a side cross-sectional structure of the manifold body.

FIG. 3 is an exploded view showing an exploded structure of the manifold body.

FIG. 4 is a schematic view showing a bonding state of pieces between the pieces of the manifold body.

FIG. 5 is a schematic view showing a bonding mode of bonding between pieces of the manifold body.

FIG. 6 is a schematic view showing a bonding mode of bonding between pieces of the manifold body.

[Explanation of symbols]

10: manifold body (resin member constituting resin hollow structure of intake system of internal combustion engine), 15: surge tank (hollow part), 16: branch pipe (hollow part), 17: pressure storage chamber (hollow part), 20 to 23 pieces, 26 to 31 pieces divided around the piece, 33, 35 further joined faces (further joined faces provided at sites offset from the divided face around the pieces), 37, 38 ... more Joining surface (further joining surface formed on the inside of the piece from the divided surface around the piece).

Continuing from the front page (72) Inventor Takio Suzuki 1-1, Kyowa-cho, Obu-shi, Aichi Prefecture 1 Ai San Kogyo Co., Ltd. (72) Inventor Toshimichi Asai 1-1-1, Kyowa-cho, Obu City, Aichi Prefecture 1 Ai San Within Industrial Co., Ltd. (72) Inventor Makoto Fujimori 1-1-1, Kyowa-cho, Obu City, Aichi Prefecture Inside Ai San Kogyo Co., Ltd. (72) Inventor Yoshihiro Sakuma 1-1-1, Kyowa-cho, Obu City, Aichi Prefecture Industrial Co., Ltd. F term (reference) 4F211 AD05 AD35 AE10 AG07 AH16 TA01 TA03 TC14 TD01 TH02 TH18 TJ30 TN07 TN20 TN31 TN41 TQ05

Claims (3)

[Claims] 1. A resin member which is provided in an intake system of an internal combustion engine and forms a hollow structure having a hollow portion therein is divided into a plurality of pieces, and these pieces are pasted with a peripheral divided surface as a joining surface. In a resin hollow structure for an intake system of an internal combustion engine formed by joining and joining, an additional joining surface is formed on the piece at a position offset from a division surface thereof. Resin hollow structure for intake system. 2. A resin member, which is provided in an intake system of an internal combustion engine and forms a hollow structure having a hollow portion therein, is divided into a plurality of pieces, and these pieces are pasted on each other with a peripheral divided surface as a joining surface. In a resin hollow structure for an intake system of an internal combustion engine formed by joining and joining, a further joining surface is formed on the piece at a portion inside the piece with respect to a surrounding divided surface. And a resin hollow structure for an intake system of an internal combustion engine. 3. The resin hollow structure for an intake system of an internal combustion engine according to claim 2, wherein the further joint surface extends from the joint surface of the divided surface around the piece toward the inside of the piece. A resin hollow structure for an internal combustion engine intake system.