JPH1077918A - Resin intake manifold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress generation of noise caused by pressure pulsation accompanied with the opening and closing operation of a throttle valve in a resin intake manifold provided with a furcate branch pipe to be connected with a throttle body, a set part with which the branch pipe is connected and a distribution pipe for distributing inlet air from the set part to an intake port. SOLUTION: An intake manifold 11 is provided with a furcate branch pipe 14, a surge tank 15 with which the downstream side part of the branch pipe 114 is connected and 6 distribution pipes 16 connected with the surge tank 15. In a triangle area R surrounded by the branch pipe 114 and the surge tank 15, a connection plate 40 is provided. The area R is covered by the connection plate 40 roughly all over the area Each parts surrounding the area R in the branch pipe 114 and the surge tank 15 is connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin intake manifold, and more particularly, to a bifurcated branch pipe connected to a throttle body, and an assembly part connected to the branch pipe.
The present invention relates to a resin intake manifold having a distribution pipe for distributing intake air from a collecting portion to an intake port.

[0002]

2. Description of the Related Art In recent years, it has been attempted to reduce the weight and cost of various automobile parts by converting them into resin. For example, Japanese Unexamined Utility Model Publication No. 2-72354 discloses a technique in which an intake manifold constituting a part of an intake passage is formed of a synthetic resin.
This type of intake manifold includes, for example, an inlet pipe connected to the downstream side of a throttle body, a surge tank connected to the inlet pipe, and a distribution pipe for guiding intake air in the surge tank to an intake port. Is done.

[0003] In the intake manifold as described above, for example, the introduction pipe is branched into two branches for the purpose of reducing the pipe resistance in the introduction pipe, or because a valve for controlling the intake is provided in the surge tank. There is a case where a structure that is made to be used is adopted. FIG. 5 shows an example of such an intake manifold 100. As shown in FIG. 1, a throttle body 1 having a built-in throttle valve 101a is provided.
The downstream side of the introduction pipe 102 connected to 01 is bifurcated and connected to the surge tank 103. The plurality of distribution pipes 10 connected to the surge tank 103
Reference numerals 4 are respectively connected to intake ports (not shown).

[0004] The intake air that has passed through the throttle body 101 is introduced into a surge tank 103 through an introduction pipe 102. The intake air introduced into the surge tank 103 is introduced into the intake port from each pipe 104, and the intake valve 1
When the valve 01a (not shown) is opened, it is taken into a combustion chamber (both not shown) of the engine.

[0005]

Here, the amount of intake air taken into the combustion chamber is adjusted by opening and closing the throttle valve 101a. The opening and closing operation of the throttle valve 101a causes the intake manifold 1 to open and close.
A pressure pulsation occurs in the intake air flow within 00. as a result,
In some cases, the intake manifold 100 generates noise using the pressure pulsation as a vibrating force. That is, when the intake air flow having the pressure pulsation that has passed through the throttle valve 101a collides with the branched portion (the portion indicated by A in FIG. 5) of the introduction pipe 102, the portion A vibrates and generates noise. In particular, the intake manifold 100 made of a resin material has a lower rigidity than the same manifold made of a metal material, so that the amplitude of vibration tends to be large, and there is a problem that noise is further increased.

The present invention has been made in view of the above circumstances, and has as its object to provide a bifurcated branch pipe connected to a throttle body, a collecting part to which the branch pipe is connected, and an intake port from the collecting part. In a resin intake manifold provided with a distribution pipe for distributing intake air to the intake manifold, generation of noise due to pressure pulsation accompanying opening / closing operation of a throttle valve is suppressed.

[0007]

According to a first aspect of the present invention, there is provided an intake manifold formed of a resin material, wherein the intake manifold is located downstream of a throttle body containing a throttle valve. A branch pipe, the downstream side of which is bifurcated, a collecting section connected to the downstream side of the branch pipe, and a distribution pipe connected to the collecting section for distributing intake air to an intake port of the engine. In the resin intake manifold, a support member is disposed in a region surrounded by the branch pipe and the gathering portion, and the purpose is to connect portions surrounding the region in the branch pipe and the gathering portion to each other with the support member. I do.

According to the above configuration, the support member is provided in the region surrounded by the branch pipe and the collecting portion, and the member surrounds the region surrounding the region in the branch pipe and the collecting portion. This increases the rigidity, particularly the bending rigidity, of the portion surrounding the region in the branch pipe and the collecting portion. Therefore, even when the intake airflow having pressure pulsation collides with the portion surrounding the region, the amplitude of the vibration caused by the pressure pulsation can be suppressed to a small value.

According to a second aspect of the present invention, in the first aspect, the support member has a plate-like shape and substantially covers the entire area surrounded by the branch pipe and the collecting portion. Its purpose is to cover over.

[0010] According to the above configuration, in addition to the operation of the first aspect, since the area surrounded by the branch pipe and the collecting portion is substantially entirely covered by the plate-shaped support member, noise passing through the area is covered. Is reduced in size.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view of the intake manifold 11, and FIG. 2 is a left side view of the manifold 11. Also, FIG.
FIG. 3 is a cross-sectional view taken along line −3.

The intake manifold 11 in this embodiment forms a part of an intake passage in a six-cylinder engine (not shown). As shown in FIG. 2, the intake manifold 11 has an upper divided body 12 divided into upper and lower parts.
And a lower divided body 13, and each of these divided bodies 12, 1
3 are joined together and integrated. Each of the divided bodies 12 and 13 is formed of a resin material, for example, a polyamide resin (66 nylon or the like). The intake manifold 11 is connected to a branch pipe 14 having a bifurcated shape, a surge tank 15 serving as an assembly to which a downstream portion (the lower portion in FIG. 1) of the branch pipe 14 is connected, and a surge tank 15. It is constituted by six distribution pipes 16. These branch pipe 14, surge tank 15,
Inside the distribution pipe 16, an upstream opening 14a of the branch pipe 14 is provided.
The intake air introduced from the downstream side opening 1 of each distribution pipe 16
Internal spaces 17 (shown in FIG. 3) that can flow to 6a (shown in FIG. 1) are formed.

As shown in FIG. 1, a mounting flange 20 integrally formed with the lower divided body 13 is provided at an upstream portion (upper portion in FIG. 1) of the branch pipe 14. A throttle body (not shown) having a built-in throttle valve (not shown) is attached to the mounting flange 20.
Air cleaner (not shown) upstream of the throttle body
Etc. are connected. The intake air introduced into the intake passage via an air cleaner or the like is introduced into the internal space 17 of the intake manifold 11 from the upstream opening 14a of the branch pipe 14.

As shown in FIG. 1 and FIG.
Is provided with a mounting plate 21 integrally formed with the lower divided body 13, and the downstream portion of each distribution pipe 16 is connected by the plate 21. By attaching the mounting plate 21 to a cylinder head (not shown) of the engine, the downstream openings 16a of the distribution pipes 16 are connected to intake ports (not shown) formed in the cylinder head. The intake air introduced into the intake manifold 11 is introduced into each intake port through the inside of the branch pipe 14, the surge tank 15, and each distribution pipe 16, and from each port when an intake valve (not shown) is opened. It is taken into a combustion chamber (not shown).

As shown in FIG. 3 and FIG.
Flanges 22 and 23 are respectively formed on the peripheral edges of 2 and 13, and the divided bodies 12 and 13 are integrated based on the joining of these flanges 22 and 23 by vibration welding.

As shown in FIGS. 1 and 3, a connecting plate 40 as a support member is provided in a triangular region R surrounded by a bifurcated branch pipe 14 and a surge tank 15. The region R is substantially entirely covered by the connecting plate 40. This connecting plate 40 is the upper divided body 1
The portion surrounding the region R in the branch pipe 14 and the surge tank 15 is connected via a flange 22. In the connecting plate 40, a pair of outlets 41 is formed in a portion which is the lowest position when the intake manifold 11 is attached to the engine. When water adheres to the upper surface of the connecting plate 40, the water is discharged from each outlet 41 without stopping on the connecting plate 40.

As shown in FIGS. 1 to 3, each divided body 12, 1
A plurality of ribs 30 and 31 extending in the vertical and horizontal directions are formed on the outer peripheral surface of 3. Similarly, a plurality of ribs 42 and 43 extending vertically and horizontally are formed on the lower surface of the connecting plate 40.

The operation and effect of the embodiment constructed as described above will be described below. When the operation of the engine is started, the intake air is supplied to the intake manifold 1
1 and is taken into the combustion chamber. At this time, the amount of intake air taken into the combustion chamber is adjusted by a throttle valve built in the throttle body. With the opening / closing operation of the throttle valve, the intake air flowing downstream of the throttle valve has a pressure pulsation. Occurs. When the suction air flow having the pressure pulsation is introduced into the intake manifold 11 from the upstream opening 14a of the branch pipe 14, the suction air flow is applied to the pipe wall of the bifurcated branch pipe 14 (in the above-described region). (The inner wall surrounding R). Then, the intake airflow flows downstream while the flow direction is changed by the pipe wall. At this time, the pipe wall vibrates due to the pressure pulsation of the intake air flow, and noise is generated from the pipe wall.

According to the present embodiment, the portions surrounding the region R in the branch pipe 14 and the surge tank 15 are connected by the connecting plate 40. Thereby, the region R
The rigidity of the part surrounding is increased. Therefore, even when the intake air flow collides with the pipe wall of the branch pipe 14, the amplitude of the vibration caused by the pressure pulsation can be suppressed to be small. As a result, noise generated by the vibration of the pipe wall can be reduced.

In particular, according to this embodiment, the connecting plate 4
Since the rigidity of the connecting plate 40 itself is increased by forming the ribs 42 and 43 extending vertically and horizontally on the lower surface of 0, the rigidity of the portion surrounding the region R in the branch pipe 14 and the surge tank 15 can be further improved. it can. As a result, noise due to pressure pulsation can be reduced more reliably.

There are various noise sources in the engine room where the intake manifold 11 is arranged. According to the present embodiment, since substantially the entire region R is covered by the connecting plate 40, noise that propagates from below the intake manifold 11 through the region R and propagates upward can be reduced. This can contribute to reduction of engine noise.

FIG. 4 shows the result of an experiment conducted to confirm the noise reduction effect of the present embodiment, and shows the sound pressure level in the vicinity of the intake manifold 11 for each frequency. In the figure, the dashed line indicates the sound pressure level in the present embodiment, and the broken line indicates the sound pressure level in the intake manifold in which the connecting plate 40 is omitted in the present embodiment as a comparative example. As is clear from the experimental results, according to the present embodiment, the sound pressure level in a high frequency region above a certain specific frequency is larger than the comparative example by (1).
0 dB).

Further, in the present embodiment, a pair of outlets 41 are formed in the connecting plate 40 at the lowest position when the intake manifold 11 is attached to the engine. Generally, a resin material tends to decrease its rigidity by absorbing moisture. In this regard, according to the present embodiment, the water adhering to the upper surface of the connecting plate 40 is discharged from each outlet 41 without stopping. Accordingly, it is possible to suppress a decrease in rigidity caused by the connection plate 40 absorbing moisture, and to avoid an increase in sound pressure level due to the decrease in rigidity.

Further, according to the present embodiment, a plurality of horizontal ribs 30 and vertical ribs 31 are formed on the outer peripheral surfaces of the divided bodies 12 and 13. Accordingly, the rigidity of the intake manifold 11 can be increased while minimizing the weight increase. As a result, vibration and noise generated in the entire intake manifold 11 can be reduced.

The present invention can be embodied as another embodiment described below. (1) In the above embodiment, the polyamide resin is used as the resin material forming the intake manifold 11. On the other hand, other resin materials such as polypropylene and polyester resin may be used.

(2) In the above embodiment, each divided body 12,
13 were joined together to form the intake manifold 11. On the other hand, the intake manifold 11 may be formed integrally.

(3) In the above embodiment, the connecting plate 40 covering the support member according to the present invention over substantially the entire region R is provided.
However, the support member does not necessarily have to be plate-shaped, and may have any shape, for example, a rod shape, as long as the member connects the portions surrounding the region R in the branch pipe 14 and the surge tank 15 to each other. Is also good.

(4) In the above embodiment, the ribs 42 and 43 are formed only on the lower surface of the connecting plate 40. On the other hand, the ribs 42 and 43 may be formed only on the upper and lower surfaces or the upper surface of the connecting plate 40.

The technical ideas that can be grasped from the above embodiments are described below together with their effects. (A) The resin intake manifold according to the second aspect, characterized in that ribs are formed on the surface of the plate-shaped support member. According to this configuration, the noise of the intake manifold caused by the pressure pulsation can be reduced more reliably by increasing the rigidity of the support member.

[0030]

According to the first aspect of the present invention, the support member is provided in a region surrounded by the branch pipe and the collecting portion.
The support member connects the portions surrounding the region in the branch pipe and the collecting portion to each other. Therefore,
Rigidity of a portion surrounding the region in the branch pipe and the collecting portion,
In particular, the bending rigidity increases. As a result, even when the intake air flow having pressure pulsation collides with the portion surrounding the region,
The amplitude of the vibration caused by the pressure pulsation can be suppressed to be small, and the generation of noise caused by the pressure pulsation can be suppressed.

According to a second aspect of the present invention, in the first aspect, the support member has a plate-like shape, and the member covers substantially the entire area with the support member. Therefore,
In addition to the effects of the first aspect, the magnitude of noise passing through the region can be reduced, and the sound pressure level that propagates from the engine room where the intake manifold is installed to the outside can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of an intake manifold.

FIG. 2 is a side view of the intake manifold.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is a diagram showing the magnitude of a sound pressure level at each frequency.

FIG. 5 is a plan view showing a resin intake manifold according to a conventional technique.

[Explanation of symbols]

11 intake manifold, 14 branch pipe, 15 surge tank, 16 distribution pipe, 40 connecting plate.

Claims (2)

[Claims] 1. An intake manifold formed of a resin material, which is connected to a downstream side of a throttle body containing a throttle valve, the downstream side of which is bifurcated, and the downstream side of the branch pipe is connected. In the resin intake manifold, which is provided with a collecting portion connected to the collecting portion and a distribution pipe for distributing intake air to an intake port of an engine, a region surrounded by the branch pipe and the collecting portion A resin intake manifold, wherein a support member is provided, and the portion surrounding the region in the branch pipe and the collecting portion is connected to each other by the support member. 2. The resin intake manifold according to claim 1, wherein the support member has a plate shape and covers substantially the entire area.