JP2000097118A - Surge tank with built-in resonator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surge tank with built-in resonator which allows to use parts commonly in different sorts of vehicles, as well as can reduce the assembling process number in a simple structure, so as to reduce the manufacture cost. SOLUTION: A surge tank is formed of a pair of housings 1 and 2 which are formed by dividing along from an upstream side connection 4 to a downstream side connection 5, a dividing plate 12 is arranged from the upstream connection 4 side to the downstream connection 5 side in one side housing 1, a resonator chamber 14 is partitioned in the surge tank, and communicating parts 15 and 16 are provided to the partition plate 12, so as to communicate the inside of the surge tank and the inside of the resonator chamber 14. As a result, a desired performance can be obtained by a simple structure and very few number of part items, and only by converting the dividing plate 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surge tank provided in an intake passage of an engine, and more particularly to a surge tank having a built-in resonator for improving volumetric efficiency and reducing intake noise. .

[0002]

2. Related Art As is well known, a resonator is used to improve volumetric efficiency in a specific rotation range and reduce intake noise by positively utilizing a pressure wave generated by opening and closing an intake valve. Has been put to practical use. In this resonator, a box-shaped resonator chamber is provided independently of the intake passage of the engine, and the resonator chamber is formed by, for example, a portion having an enlarged passage cross-sectional area immediately upstream of the throttle (hereinafter, this portion is referred to as
In order to distinguish the intake air on the downstream side of the throttle from the surge tank that distributes the intake air to each cylinder, this is connected to an upstream surge tank by a hose or the like. The volume of the resonator chamber, the inner diameter of the hose, and the length of the hose are set in accordance with the intake system of the engine so that the above-described effect of the pressure wave is maximized.

[0003]

However, the conventional resonator requires the production of an independent resonator chamber as described above, and also requires parts such as a hose and a hose clip for retaining the hose. However, there is a problem that the manufacturing cost rises as the number of steps increases.

[0004] In addition, since the arrangement of the intake system of the engine is changed when the type of the mounted vehicle is different, it is necessary to reset the specifications of the resonator. However, for example, a change in the volume of the resonator chamber means remanufacture of the resonator chamber itself, which is a factor that further increases the manufacturing cost. An object of the present invention is to provide a surge tank with a built-in resonator that can reduce the number of assembly steps and the manufacturing cost with a simple configuration.

[0005]

In order to achieve the above object, according to the present invention, a surge tank is formed by a plurality of housings divided along an upstream connection portion and a downstream connection portion, and the surge tank is formed in one of the housings. A split plate was arranged from the upstream connection portion side to the downstream connection portion side to divide a resonator chamber in the surge tank, and a communication portion was provided in the split plate to allow communication between the surge tank and the resonator chamber. Therefore, since the inside of the surge tank is simply divided by the dividing plate provided with the communicating portion, the number of parts is extremely small, and the surge tank can be completed in advance alone and the position of the dividing plate can be changed. The desired performance can be obtained only by changing the volume of the resonator chamber or changing the specification of the communicating portion provided on the divided plate.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a surge tank with a built-in resonator (upstream surge tank) embodying the present invention will be described below. FIG. 1 is a plan view of a surge tank with a built-in resonator, in which the upper housing is partially broken, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a sectional view taken along line III-III of FIG. . As shown in these figures, the upstream surge tank is configured by overlapping an upper housing 1 and a lower housing 2 in a monaka shape.
Is provided with a pair of brackets 3 for attachment to a vehicle. Both housings 1 and 2 are injection-molded with a synthetic resin material, and the entire periphery thereof is fixed to each other by ultrasonic welding or the like. Cylindrical upstream connection portions 4 and downstream connection portions 5 are formed integrally at two positions of the upstream surge tank 1 that are substantially 180 degrees opposite each other in the horizontal direction. The upper halves of the connecting portions 4 and 5 are formed integrally with the upper housing 1 and the lower half thereof is formed integrally with the lower housing 2.

As shown by a two-dot chain line in FIG. 1, when mounted on a vehicle, an air duct 6 is connected to the upstream connecting portion 4 and a throttle body 7 having a built-in throttle valve is connected to the downstream connecting portion 5. You. As indicated by the two-dot chain line arrow, the intake air flows into the upstream connection portion 4 in the upstream surge tank.
From the air to the downstream connecting portion 5 in a substantially horizontal direction.

In the upstream surge tank, a partition wall 9 is formed in the vicinity of the upstream connection portion 4 in a vertical direction, and the partition wall 9 defines a first resonator chamber 10 with respect to the intake air passage 8. A curved first communication pipe 11 is provided on the bottom surface of the first resonator section chamber 10.
One end of the communication pipe 11 is opened in the first resonator chamber 10 and the other end is opened in the intake air passage 8.
The inside of the resonator chamber 10 communicates with the inside of the intake air passage 8 through the first communication pipe 11.

The upper half of the partition 9 is the upper housing 1.
On the other hand, the lower half is formed integrally with the lower housing 2. The lower half of the first communication pipe 11 is formed integrally with the lower housing 2, and the upper half is manufactured as a separate piece 11a. On the upper housing 1 side in the intake passage 8, a split plate 12 is disposed substantially horizontally from the upstream connection portion 4 to the downstream connection portion 5. The division plate 12 cooperates with a vertical wall 13 extending downward from the ceiling surface in the upper housing 1 to partition a second resonator chamber 14 above the intake air passage 8, and The outer periphery is fixed to the upper housing 1 at predetermined intervals by ultrasonic welding or the like.
The split plate 12 is injection-molded from a synthetic resin material, and a plurality of ribs 12a are formed at upper and lower surfaces thereof at predetermined intervals to ensure strength. Note that the vertical wall 13 may be formed on the division plate 12 side. In this case, the housings 1, 2
In addition to changing the volume in the vertical direction of the
The volume of the resonator chamber 14 can be changed in the flow direction of the intake air only by changing

A circular communication hole 15 is formed at a position close to the downstream connecting portion 5 of the split plate 12, that is, at a position closest to the engine when mounted on a vehicle, and an upper surface of the split plate 12 (the second resonator chamber 14) is formed. On the (side) side, a linear second communication pipe 16 is integrally formed so as to cover the communication hole 15. One end of the second communication pipe 16 is connected to the communication hole 15.
, The other end opens into the second resonator chamber 14, respectively. As a result, the inside of the second resonator chamber 14 is opened via the communication hole 15 and the second communication pipe 16. It communicates with the inside of the intake passage 8. In the present embodiment, a communication portion is formed by the communication hole 15 and the second communication tube 16, and the inner diameter of the communication hole 15 and the second communication tube 16 is:
They are set almost equal.

Although the structure of the upstream surge tank is as described above, the shape of the second communication pipe 16 can be simultaneously injection-molded with the split plate 12 by devising its shape. More specifically, FIG. 4 shows the relationship between the dies during injection molding. The upper die 21 that forms the upper surface of the split plate 12 and the outer surface of the second communication tube 16, the lower surface of the split plate 12, A lower mold 22 for forming the communication hole 15;
Using the core 23 forming the inner surface of the second communication pipe 16,
Injection molding is performed.

When the upper mold 21, the lower mold 22, and the core 23 are closed, a cavity corresponding to the entire divided plate 12 including the second communication pipe 16 and the communication hole 15 is formed. By injecting the resin, the entire divided plate 12 is formed. Split plate 12 after molding
In order to take out the upper mold 21, the lower mold 22, and the core 23 need to be mold-opened, respectively. However, the lower mold 22 unrelated to the molding of the second communication pipe 16 can naturally be mold-opened downward. . As for the upper die 21 and the core 23, as is clear from the figure, the second communication pipe 16 is
Since the opening is formed laterally along the upper surface of 2, the upper mold 21 can be opened upward and the core 23 can be opened laterally without any trouble. As a result, the split plate 12 is formed by one injection molding.
At the same time, the second communication pipe 16 is formed.

On the other hand, the surge tank with a built-in resonator configured as described above functions as described below when mounted on a vehicle. Intake air taken in from an air inlet (not shown) flows through an air filter, an air flow meter, and an air duct 6 into an intake passage 8 from an upstream connection portion 4 of an upstream surge tank, and then from a downstream connection portion 5 to a throttle body. 7. The fuel is distributed to the intake manifold of each cylinder via the surge tank on the downstream side, and is introduced into the combustion chamber of the engine together with the fuel injected from the injector when the intake valve is opened. At this time, the pressure wave generated due to the opening and closing of the intake valve is reflected to the upstream surge tank, and the first communication pipe 1
After reaching 1 into the first resonator chamber 10 through 1,
After reaching the second resonator chamber 14 via the second communication pipe 16, resonance is generated in both the resonator chambers 10 and 14, thereby improving the volumetric efficiency in a specific rotation range and reducing the intake noise. .

Needless to say, the volumes of the first and second resonator chambers 10, 14 and the first and second communication pipes 1
The inner diameter and the length of 1, 16 are set in accordance with the intake system of the engine so that the above-mentioned effect by the pressure wave is maximized. The surge tank with a built-in resonator according to the present embodiment is configured as described above, and has the following advantages.

First, the inside of the upstream surge tank is partitioned by a partition wall 9 and a split plate 12 to provide first and second resonator chambers 10 and 14, and the resonator chambers 10 and 14 and the intake air passage 8 are connected to each other. First and second communicating
Are formed integrally with the divided plate 12 and the lower housing 2. As a result, the number of parts is extremely small compared to the conventional resonator in which an independent resonator chamber is manufactured and connected with a hose, and the upstream surge tank can be completed in advance by itself. In this case, the number of steps can be reduced, and the manufacturing cost can be greatly reduced.

As is well known, the specifications of the resonator (the volumes of the resonator chambers 10 and 14 and the inner diameters and lengths of the communication pipes 11 and 16) need to be set according to the layout of the intake system of the type of vehicle mounted. However, the specifications of the second resonator chamber 14 can be easily handled only by changing the division plate 12. In other words, the optimal inner diameter and length of the second
When the split plate 12 having the communicating pipes 16 is manufactured, and the split plate 12 is fixed in the upstream surge tank, the vertical position of the second resonator chamber 14 is adjusted so that the second resonator chamber 14 has a volume suitable for the vehicle type. Should be determined.

As a result, the upper housing 1 and the lower housing 2 can be shared between different vehicle types only by preparing only the split plate 12 for each vehicle type. Moreover, although the split plate 12 needs to be manufactured for each vehicle model, the shape of the second communication pipe 16 is devised as described above, so that the split plate 12 can be easily manufactured by one injection molding, and the above-described cost reduction is further achieved. You can push forward.

On the other hand, in the present embodiment, the position of the second communication pipe 16 on the dividing plate 12 is set closest to the engine. This is a consideration for effectively applying the pressure wave from the engine to the second resonator chamber 14, but if the shape of the split plate 12 is determined, the second communication pipe 1
Since the position of No. 6 is uniquely determined, there is no need to change the position. On the other hand, in consideration of the cycle of the pressure wave of the intake system, the second communication pipe 16 may be provided at the antinode of the cycle in which the pressure wave becomes maximum. In this case, it is necessary to change the position of the second communication pipe 16 according to the intake system of the engine. However, similarly to the above-described inner diameter and length, the second communication pipe 16 is optimized for each vehicle type. If the split plate 12 provided at the position is manufactured, the housings 1 and 2 can be shared as described above.

The description of the embodiment has been completed above, but the embodiments of the present invention are not limited to this embodiment. For example,
In the above embodiment, the first resonator chamber 10 and the first communication pipe 11 are provided in the upstream surge tank in addition to the second resonator chamber 14 and the second communication pipe 16. The first resonator chamber 10 and the first communication pipe 11 may be omitted as long as the required resonance characteristics can be realized.

In the above embodiment, the split plate 12 is provided in the upper housing 1 so that the second resonator chamber 14
However, the arrangement state of the division plate 12 is not limited to this. For example, even if a similar division plate is arranged in the lower housing 2 and a new resonator chamber is added. Good. On the other hand, in the above-described embodiment, the second communication pipe 16 is formed to be laterally opened along the upper surface of the division plate 12 so that the second communication pipe 16 can be integrally formed with the division plate 12. However, the present invention is not limited to this. For example, it may be formed in a general upright pipe shape.

[0021]

As described above, according to the surge tank with a built-in resonator of the present invention, since the inside of the surge tank is simply divided by the dividing plate provided with the communicating portion, the number of parts is extremely small. , It is possible to reduce the man-hours on the assembly line by completing the surge tank alone in advance.
Moreover, the desired performance can be obtained only by changing the position of the split plate and the specification of the communicating portion, and the manufacturing cost can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a partially broken plan view illustrating a surge tank with a built-in resonator according to an embodiment.

FIG. 2 is a sectional view taken along line II-II of FIG.

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

FIG. 4 is an explanatory diagram showing the interrelationship of dies during injection molding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper housing 2 Lower housing 4 Upstream connection part 5 Downstream connection part 12 Division plate 14 2nd resonator chamber 15 Communication hole (communication part) 16 2nd communication pipe (communication part)

 ──────────────────────────────────────────────────続 き Continuing from the front page (71) Applicant 000006286 Mitsubishi Motors, Inc. 5-33-8 Shiba, Minato-ku, Tokyo (72) Inventor Yoshihiro Omi 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Inside (72) Inventor Kiyoshi Konishi 4-21-1, Shimomaruko, Ota-ku, Tokyo Inside Mitsubishi Automotive Engineering Co., Ltd. (72) Inventor Tatsuhiko Ozaki 3-3-1 Shododa, Hirakata-shi, Osaka Shin-Kobe Plastics Stock In company

Claims (1)

[Claims] 1. A plurality of housings, which are formed separately from an upstream connection portion communicating with an air intake and a downstream connection portion communicating with an engine side to form a surge tank through which intake air flows. A split plate arranged in the housing from the upstream connection portion side to the downstream connection portion side to partition the resonator chamber in the surge tank; and provided on the split plate, and inside the surge tank and the resonator chamber. A surge tank with a built-in resonator.