JPH09177625A - Intake manifold made of resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the intake manifold made of resin, which is high in pressure resistance strength, and is excellent in sealing performance when mounted to an engine. SOLUTION: The intake manifold made of resin is formed out of a first member 11 provided with a plurality of passages divided by each bulkhead 110, and of a second member 12 having a surge tank 4 and downstream side ports 22, and comprising a mounting flange 3 provided for the outlets of the downstream side ports 22. By assembling the aforesaid items, a structure is so constituted as to allow air to flow into the surge tank 4, an upstream side port and the downstream side port 22 in order. At the center portion of the first and second members 11 and 12, bolt holes 17 and 37 penetrating through the bulkheads and the mounting flange, are bored therein, and concurrently the first and second members 11 and 12 are thereby fixed to an engine by inserting the bolt 7 therein.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a resin intake manifold used for an automobile engine.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
Has been proposed, and a resin intake manifold 9 made of synthetic resin has been proposed in which the intake port portion is integrally and compactly integrated. The intake manifold 9 is formed by joining a first member 91 and a second member 92 made of a synthetic resin, and has a surge tank 4, an upstream port 21, and a downstream port 22 therein as shown in FIG. The intake port consists of.

In the intake manifold 9, the air sucked into the surge tank 4 through the opening of the suction side flange portion 45 has the upstream ports 21 of the first member 91 and the downstream ports of the second member 92. It passes through 22 and is sent to the engine.

Further, the intake manifold 9 is shown in FIG.
As shown in FIG. 5, the second member 92 is fixed to the engine through a mounting flange 93 provided at the outlet of the downstream side port 22. For fixing to the engine, bolts are inserted through the four mounting holes 32 provided in the peripheral portion of the mounting flange 93 and fixed.

[0005]

However, the above-mentioned conventional resin intake manifold has the following problems. That is, the intake manifold 9 has the first
The member 91 and the second member 92 are assembled by joining only at the contact surface of the outer peripheral portion thereof. Therefore, if the internal pressure of the intake manifold rises,
The pressure concentrates on the joint portion of the outer peripheral portion. Therefore, excessive joining strength is required for the abutting surface, which causes geometrical restrictions.

Further, as shown in FIG. 8, the mounting hole 32 of the mounting flange 93 in the conventional intake manifold 9 cannot be provided on the side facing the surge tank 4 due to problems such as tightening workability. Therefore, when it is mounted on the engine, the distance between the bolts becomes long and the sealing property between the mounting flange 93 and the engine becomes poor.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a resin intake manifold having a high pressure resistance and an excellent sealability for mounting on an engine.

[0008]

According to a first aspect of the present invention, there is provided a first member having an upstream port and a plurality of passages divided by partition walls, a surge tank and a downstream port, and the downstream side. The surge tank, the upstream side port, and the downstream side are formed by assembling the first member and the second member with a second member provided with a mounting flange for attaching to the engine at the outlet of the port. In a surge tank integrated intake manifold configured so that intake air sequentially flows into a port, a partition wall of the first member and a mounting flange of the second member are provided in a central portion of the first member and the second member. A bolt hole passing through is provided, and the first member and the second member are fixed to the engine by a bolt that penetrates both bolt holes. In the resin intake manifold according to claim.

What is most noticeable in the present invention is that the bolt holes are provided in the central portions of the first member and the second member, respectively, and that the first member and the second member are formed by bolts penetrating both bolt holes. The two members are fixed to the engine.

As described above, the second member has the portion forming the surge tank and the portion forming the downstream side port. The surge tank is a single chamber that communicates for distributing the sucked air to the plurality of upstream ports, and the entire contact surface side with the first member is opened. Further, the downstream port is a plurality of intake passages, and penetrates from the inlet on the contact surface side with the first member to the outlet on the mounting flange side.

On the other hand, in the first member, a part of the end face portions of the plurality of partition walls are arranged in the opening of the surge tank to form the inlet of the upstream side port. Further, the remaining portion of the end face portion of the partition wall is brought into contact with the wall portion between the adjacent downstream side ports of the second member to connect the upstream side port to the downstream side port (see FIG. 1). Therefore, the intake manifold is configured so that the intake air drawn into the surge tank takes a U-shaped orbit and sequentially flows through the upstream port and the downstream port (see FIG. 4).

The first member and the second member are manufactured by injection molding using synthetic resin such as polypropylene and nylon reinforced with fibers such as glass fiber and ceramic whiskers. The first member and the second member are joined by vibration welding or an adhesive, for example.
In the case of joining by vibration welding, it is preferable that a welding flange for welding is provided in advance on the contact surfaces of the first member and the second member, and these are vibration welded. As a result, a uniform and strong joint can be obtained.

Next, the operation of the present invention will be described. In the resin intake manifold of the present invention, the bolt holes are provided in the central portions of the first member and the second member, respectively, and the first member and the second member are connected by bolts penetrating both bolt holes. It is fixed to the engine.

That is, the first member and the second member are firmly crimped by the bolts at the central portion thereof.
Therefore, the first member and the second member are firmly joined not only in the joint surface of the outer peripheral portion but also in the central portion. Therefore, the pressure resistance against the pressure generated inside the intake manifold is significantly improved compared to the conventional method without changing the joining specifications.

The bolt hole of the second member is provided at the center of the mounting flange on the surge tank side.
Therefore, it is possible to easily perform bolting to the central portion where it is difficult to tighten the bolts from the upper portion of the first member, and it is possible to shorten the distance between the mounting flange and other bolts. Therefore, the sealability between the mounting flange and the engine can be further improved.

Next, according to the invention of claim 2, the first
It is preferable that a partition having a communication hole communicating from the surge tank to the upstream port is provided between the member and the second member. As a result, the flow of air between the surge tank and each port can be controlled, and the air in the surge tank can be efficiently and evenly supplied to each port. Also, the rigidity of the entire intake manifold can be increased.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment Example A resin intake manifold according to an embodiment example of the present invention will be described with reference to FIGS. 1 to 7. As shown in FIGS. 1 to 5, the resin intake manifold 1 of this example includes a first member 11 having an upstream port 21 (FIG. 4) and a plurality of passages 111 divided by a partition wall 110. A second member 1 having a surge tank 4 and a downstream side port 22 and provided with an attachment flange 3 for attaching to the engine at the outlet of the downstream side port 22.
It consists of two.

Then, as shown in FIG. 4, the first member 11
By assembling the second member 12 and the second member 12, the intake air sequentially flows to the surge tank 4, the upstream port 21, and the downstream port 22.

Further, as shown in FIGS. 1 and 5, the first member 1 is provided at the central portion of the first member 11 and the second member 12.
The bolt holes 17 and 37 penetrating the partition wall 110 of 1 and the mounting flange 3 of the second member 21 are provided, and the first member 11 and the second member 12 are fixed to the engine by the bolts 7 penetrating both bolt holes. Become.

Further, in this example, FIG. 1, FIG. 4 and FIG.
As shown in FIG. 3, a partition 13 having a communication hole 130 that communicates from the surge tank 4 to the upstream port 21 is provided between the first member 11 and the second member 12.

This will be described in detail below. The second member 12 is
As shown in FIGS. 1 to 5, the surge tank 4 and the downstream port 22 are formed as described above. The surge tank 4 is, as shown in FIG.
This is a single chamber that is in communication for distributing the sucked air to the plurality of upstream ports 21 (FIG. 4), and the entire contact surface side with the first member 11 is opened.

As shown in FIG. 3, the downstream side port 22 is a plurality of intake passages partitioned by the wall portion 120, and is located from the inlet on the contact surface side with the first member 11 to the mounting flange 3 side. Penetrates to the exit. Also, the downstream port 22
As shown in FIG. 3 and FIG. 4, the square inlet gradually changes to a circular outlet. Further, the bolt hole 37 is provided in the central portion of the mounting flange 3 on the surge tank 4 side, that is, the central portion of the second member 11. It should be noted that four bolt holes 32 are provided in the place around the mounting flange 3 where the bolt tightening work is easy, as in the conventional case.

As shown in FIGS. 1 and 3, the second member 12 has a welding flange 128 for welding the first member 11 to the outer periphery thereof. The welding flange 128
As shown in FIG. 6, two bead portions 129 are provided on the entire circumference to prevent the welding burr from protruding during welding.

On the other hand, as shown in FIGS. 1 and 7, the first member 11 is provided with a plurality of partition walls 110, and the bolt hole 17 is provided at the center of the middle partition wall 110. As shown in FIG. 1, the partition wall 110 is provided with a protrusion 112 for fitting into the partition 13.

Further, a welding flange 118 for welding with the second member 12 is provided on the outer peripheral portion of the first member 11. As shown in FIGS. 1 and 6, the welding flange 118 has a projection 119, which is a portion to be welded to a counterpart welding flange 128, in the central portion thereof.

The partition 13 is, as shown in FIG.
The first member 11 has a concave portion 135 into which the protruding portion 112 of the partition wall 110 is fitted, and the communication hole 130 is provided in the concave portion 135. Further, a bolt hole 137 is provided at a position corresponding to the bolt holes 17 and 37 provided in the mounting flanges 3 of the first member 11 and the second member 12 in the upper center portion of the concave portion 135.

Then, as shown in FIG. 1, the first member 11
The second member 12 and the second member 12 are brought into contact with each other with the partition 13 interposed therebetween, and the welding flanges 118 and 128 are vibration-welded. As a result, as shown in FIGS. 4 and 5, an intake passage is formed from the surge tank 4 to the upstream port 21 and the downstream port 22 having the through hole 130 of the partition 13 as an inlet.

Therefore, in the intake manifold 1 of the present example, as shown by the arrow in FIG. 4, the intake air taken into the surge tank 4 takes a U-shaped orbit to form the upstream port 21 and the downstream port 22. It is configured to flow sequentially and be sucked into the engine intake chamber. The first member 1
The first member 12, the second member 12 and the partition 13 are made by injection molding using nylon reinforced with glass fiber.

Next, the operation of this embodiment will be described.
In the resin intake manifold 1 of this example, bolt holes 17, 37, and 137 are provided in the central portions of the first member 11, the second member 12, and the partition 13, respectively, and the bolts 7 penetrate the bolt holes. It is fixed to the engine.

That is, the first member 11 and the second member 12 are
It is firmly crimped with a bolt at its central portion. Therefore, the first member and the second member are firmly joined not only in the joint surface of the outer peripheral portion but also in the central portion. Therefore, the pressure resistance against the pressure generated inside the intake manifold is significantly improved compared to the conventional method without changing the joining specifications.

The bolt hole 37 of the second member 12 is provided at the center of the mounting flange 3 on the surge tank side. Therefore, it is possible to easily perform bolting to the central portion where it is difficult to tighten the bolts from the upper portion of the first member 11, and it is possible to shorten the interval between the mounting flange 3 and another bolt hole 32. Therefore, the sealability between the mounting flange and the engine can be further improved.

In this example, the partition 13 is interposed between the first member 11 and the second member 12. Therefore, the flow of air between the surge tank 4 and each port can be controlled, and the air in the surge tank 4 can be efficiently and evenly supplied to each port. Further, the effect of increasing the rigidity of the intake manifold 1 as a whole can be obtained.

[0033]

As described above, according to the present invention, it is possible to obtain a resin intake manifold having a high pressure resistance and an excellent sealability for mounting on an engine.

[Brief description of the drawings]

FIG. 1 is a developed perspective view of a resin intake manifold according to an embodiment.

FIG. 2 is a perspective view of a resin intake manifold according to the embodiment.

FIG. 3 is a front view of a second member in the embodiment.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a sectional view taken along line BB of FIG. 3;

FIG. 6 is an explanatory view showing a welding flange portion for vibration welding in the embodiment.

FIG. 7 is a cross-sectional explanatory view showing bolt holes of the first member, taken along the line CC in FIG. 5, corresponding to the embodiment.

FIG. 8 is a perspective view of a conventional resin intake manifold.

[Explanation of symbols]

 1. . . Resin intake manifold, 11. . . First member, 110. . . Partition wall, 12. . . Second member, 13. . . Partition, 130. . . Through hole, 17, 37, 137. . . Bolt holes, 21. . . Upstream port, 22. . . Downstream port, 4. . . Surge tank,

Claims (2)

[Claims] 1. A first member which forms an upstream port and which is provided with a plurality of passages divided by a partition wall, has a surge tank and a downstream port, and is attached to an engine at the outlet of the downstream port. And a second member provided with a mounting flange for connecting the first member and the second member, whereby intake air sequentially flows to the surge tank, the upstream port, and the downstream port. In the intake manifold integrated with the surge tank, the first member and the second member
A bolt hole penetrating the partition wall of the first member and the mounting flange of the second member is provided in the central portion of the member, and the first member and the second member are connected to the engine by a bolt penetrating both bolt holes. A resin intake manifold characterized by being fixed to. 2. The partition according to claim 1, wherein a partition having a communication hole communicating from the surge tank to the upstream port is provided between the first member and the second member. Resin intake manifold to be.