JP7106987B2 - Intake manifold for internal combustion engine - Google Patents

Description

The present invention relates to an intake manifold for an internal combustion engine.

A resonator is known that reduces noise of a predetermined frequency by using a resonance effect. For example, in Patent Document 1, in a vehicle provided with an internal combustion engine in the lower part of the passenger compartment, a communicating hole of a resonator is connected to an engine cover disposed above the internal combustion engine, and a resonance chamber of the resonator is placed in the passenger compartment. By installing it between the seats arranged on the left and right sides, the noise in the specific frequency range generated in the engine compartment is reduced.

JP-A-7-242150

By the way, if an attempt is made to dispose a resonator in the engine compartment in order to reduce noise within the engine compartment, a space for disposing such a resonator must be prepared in the engine compartment. As a result, the volume of the interior of the engine compartment is reduced by the space in which the resonator is installed, resulting in a narrower space.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an intake manifold for an internal combustion engine capable of suppressing volumetric reduction in the engine compartment due to the provision of a resonator.

An intake manifold for an internal combustion engine that solves the above problems includes a surge tank extending in the cylinder arrangement direction of the internal combustion engine, a curved distribution passage that distributes the air in the surge tank to each cylinder, and a curved portion of the distribution passage. It has a resonance chamber formed at an inner position, and a communication hole that communicates the inside of the resonance chamber with the outside.

According to this configuration, the resonator having the resonance chamber and the communication hole is integrated with the intake manifold. By attaching the intake manifold to the internal combustion engine arranged in the engine compartment, the resonator can be installed in the engine compartment. are placed. Here, in this configuration, since the resonator is provided inside the curved portion of the distribution passage, the resonator can be provided in the intake manifold without enlarging the shape of the intake manifold. Therefore, according to this configuration, it is possible to suppress the volume reduction in the engine compartment due to the arrangement of the resonator.

1 is a schematic diagram showing a front portion of a vehicle including an intake manifold according to one embodiment; FIG. The front view of the intake manifold of the same embodiment. FIG. 3 is a cross-sectional view of the intake manifold taken along line 3-3 shown in FIG. 2; FIG. 4 is a cross-sectional view of the intake manifold taken along line 4-4 shown in FIG. 3;

An embodiment of an intake manifold for an internal combustion engine will be described below with reference to FIGS. 1 to 4. FIG. The intake manifold 10 of the present embodiment is a resin intake manifold that is assembled to an in-line four-cylinder internal combustion engine.

As shown in FIG. 1 , an internal combustion engine 1 having a plurality of cylinders is horizontally mounted in an engine compartment 110 provided in the front portion of a vehicle 100 . An intake manifold 10 that supplies air to each cylinder of the internal combustion engine 1 is assembled to an intake port of the internal combustion engine 1 .

As shown in FIG. 2, the intake manifold 10 is provided with a surge tank 30 extending in the cylinder arrangement direction (arrow L direction shown in FIGS. 2 and 4) of the internal combustion engine 1 to be assembled.

A throttle flange 32 is provided at one end in the longitudinal direction (the same direction as the arrow L direction shown in FIGS. 2 and 4) of the surge tank 30 extending in the cylinder arrangement direction. , an air introduction port 33 for introducing air into the surge tank 30 is formed (see FIG. 4). A throttle body (not shown) having a throttle valve is connected to the throttle flange 32 .

As shown in FIGS. 2 and 3 , the intake manifold 10 includes a distribution passage 20 which is a curved passage branched from a surge tank 30 and which distributes and supplies the air in the surge tank 30 to each cylinder of the internal combustion engine 1 . are provided for the number of cylinders. Further, as shown in FIG. 2 , a port flange 21 for connecting the distribution passage 20 to the intake port of the internal combustion engine 1 is provided on the intake downstream side of the distribution passage 20 .

As shown in FIGS. 3 and 4, a resonance chamber 71 of a resonator 70 is formed in the distribution passage 20 at a position inside the curved portion thereof. More specifically, it is a space formed between the surge tank 30 and the distribution passage 20 and between the wall surface 39 at the bottom of the surge tank 30 and the wall surface 24 on the inner peripheral side of the curved distribution passage 20. The formed space is the resonance chamber 71 .

The resonance chamber 71 extends in the longitudinal direction of the surge tank 30 (the same direction as the arrow L direction shown in FIG. 4), and one end thereof is closed by a first wall portion 72 . A second wall portion 73 having a communication hole 74 that communicates the interior of the resonance chamber 71 with the outside (more specifically, the external space of the intake manifold 10) is provided on the other end side of the resonance chamber 71. .

In this embodiment, the first wall portion 72 and the second wall portion 73 are prepared as plate-shaped separate members, and the first wall portion 72 and the second wall portion 73 are fixed to the intake manifold 10 by vibration welding or the like. However, the first wall portion 72 and the second wall portion 73 may be provided on the intake manifold 10 by other methods. For example, the first wall portion 72 and the second wall portion 73 may be integrally formed with the intake manifold 10 .

The interior of the resonance chamber 71 communicates with the space outside the intake manifold 10 , that is, the space within the engine compartment 110 through the communication hole 74 . When a sound wave of a specific frequency generated in the engine compartment 110 enters the resonance chamber 71 through the communication hole 74 , a resonance sound wave having the same frequency and opposite phase as the incident sound wave is generated from the resonance chamber 71 . This resonant sound wave reduces the sound pressure level of the sound wave of a specific frequency generated within the engine compartment 110 .

A communication hole 74 of the second wall portion 73 functions as a neck portion of the resonator 70 . That is, the thickness t of the second wall portion 73 is the neck length of the resonator 70 , and the diameter D of the communication hole 74 is the neck diameter of the resonator 70 . If the fixed position of the first wall portion 72 in the longitudinal direction of the surge tank 30 is changed, the volume V of the resonance chamber 71 changes. Further, even if the fixing position of the second wall portion 73 in the longitudinal direction of the surge tank 30 is changed, the volume V of the resonance chamber 71 also changes.

In this embodiment, the thickness t of the second wall portion 73, the diameter D of the communication hole 74, and the volume of the resonance chamber 71 are adjusted so that the resonance frequency of the resonator 70 matches the noise frequency band to be reduced in the engine compartment 110. V is optimized respectively.

According to this embodiment described above, the following effects can be obtained.
(1) The resonator 70 having the resonance chamber 71 and the communication hole 74 is integrated with the intake manifold 10. By attaching the intake manifold 10 to the internal combustion engine 1 arranged in the engine compartment 110, the inside of the engine compartment 110 can be , a resonator 70 is arranged.

Here, in this embodiment, since the resonator 70 is provided at a position inside the curved portion of the distribution passage 20, the resonator 70 can be provided in the intake manifold 10 without enlarging the shape of the intake manifold 10. can be done. Therefore, it is possible to suppress the reduction in the volume of the engine compartment 110 due to the arrangement of the resonator 70 .

(2) The intake manifold 10 and the resonator 70 are integrated, and the installation of the resonator 70 in the engine compartment 110 is completed only by assembling the intake manifold 10 to the internal combustion engine 1 arranged in the engine compartment 110. . Therefore, the work of assembling a separate resonator in the engine compartment 110 is not necessary.

In addition, this embodiment can be changed and implemented as follows. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
The intake manifold 10 is an intake manifold assembled to an in-line four-cylinder internal combustion engine, but may be an intake manifold for an internal combustion engine having other cylinder arrangement and number of cylinders. Also, although the intake manifold 10 is made of resin, it may be made of other materials.

Reference Signs List 1 Internal combustion engine 10 Intake manifold 20 Distribution passage 21 Port flange 24 Wall surface 30 Surge tank 32 Throttle flange 33 Air inlet 39 Wall surface 70 Resonator 71... resonance chamber, 72... first wall, 73... second wall, 74... communication hole, 100... vehicle, 110... engine compartment.

Claims (2)

Located in the vehicle's engine compartment,
a surge tank extending in the cylinder arrangement direction of the internal combustion engine;
a curved distribution passage that distributes the air in the surge tank to each cylinder;
a resonance chamber formed at a position inside the curved portion of the distribution passage;
An intake manifold for an internal combustion engine, comprising a communication hole that communicates the interior of the resonance chamber with the space within the engine compartment . The resonance chamber is a space defined by a wall surface of the surge tank and an inner peripheral wall surface of the distribution passage.
An intake manifold for an internal combustion engine according to claim 1.

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