JP2013108382A - Intake manifold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake manifold with which noise associated with engine operation is hard to propagate to a passenger while inhibiting increase in an intake temperature and a manufacturing cost or the like.SOLUTION: An engine 1 is transverse-mounted on a front part of a vehicle body of an automobile 2 with its inlet side disposed backward. The intake manifold 10 is fastened in a forwardly tilting posture on a region rightward (closer to a driver's seat 4) from a center line CL of the vehicle body on an inlet port sidewall face 3a of a cylinder head 3. A sound insulation cover 15 is fastened on a rear face of a branch pipe part 13 of the intake manifold 10. The sound insulation cover 15 has a vertical size of a right part (part closer to the driver's seat 4) specified to be longer than the vertical size of a left part (part closer to the center line CL of the vehicle body), whereby an area of the right part is significantly larger than an area of the left part.

Description

  The present invention relates to an intake manifold with a sound absorbing material, and more particularly, to a technique for making it difficult to transmit noise caused by engine operation to an occupant while suppressing an increase in intake air temperature and the like.

  In a multi-cylinder engine for automobiles, an intake manifold is generally fastened to a side wall surface of an intake port in a cylinder head, and fresh air (air or air-fuel mixture) is generally supplied to a combustion chamber of each cylinder through the intake manifold. . Many intake manifolds are composed of an intake chamber that temporarily stores fresh air that has passed through an air cleaner or a throttle body, and a branch pipe that distributes fresh air in the intake chamber to the intake ports of the cylinders. Die-cast molding using aluminum alloy as a material may be adopted as a manufacturing method for intake manifolds. However, in recent years, injection molded products using resin as a material have been increasing in order to reduce weight and cost. Yes.

The plastic intake manifold has relatively low vibration damping and rigidity, and is inferior in sound insulation. Therefore, fuel injector drive sound and engine combustion sound (hereinafter referred to as engine operation noise) due to solid conduction are external. Often released. Therefore, in a car equipped with a rear intake side-mounted engine, the entire rear part of the intake manifold is covered with a large steel plate sound insulation cover with a sound absorbing material (foamed resin, etc.), making it difficult for passengers to feel engine operating noise. The thing is proposed (refer patent document 1).
JP 2004-270623 A

  Since the sound insulation cover of the cited document 1 covers the intake manifold over a wide area, it has a high effect of reducing engine operating noise, but has the following problems. That is, since the sound insulation cover also functions as a heat insulating material, the temperature of the intake air passing through the intake manifold (intake air temperature) is significantly higher than that without the sound insulation cover, and the engine output is reduced due to a decrease in charging efficiency. A reduction is brought about. In addition, the large sound insulation cover increases the manufacturing cost due to the increase in the amount of the sound absorbing material incorporated therein, and also reduces the ease of assembly to the intake manifold due to the increase in the number of fastening members.

  The present invention has been made in view of such a background, and an object of the present invention is to provide an intake manifold that makes it difficult for noise caused by engine operation to be transmitted to an occupant while suppressing an increase in intake temperature and manufacturing cost. .

  In the present invention, an intake manifold is attached to a rear intake side mounted engine mounted on a front part of a vehicle body of an automobile, and a sound insulation cover is attached to a rear part thereof. The sound insulation cover is set such that the vertical dimension on the driver's seat side is larger than the vertical dimension on the other side.

  According to the present invention, since the area of the sound insulation cover on the side close to the occupant (driver) is increased, engine operation noise can be effectively prevented, and the area of the shielding cover at a site away from the occupant is small. Therefore, an increase in intake air temperature can be prevented.

It is a top view which shows the mounting state of the engine for motor vehicles which concerns on embodiment. It is a perspective view of the intake manifold which concerns on embodiment. FIG. 6 is a rear view of the intake manifold according to the embodiment. It is an expanded sectional view of the vehicle-mounted state which follows the IV-IV line in FIG. It is a figure which shows the effect | action of embodiment.

  Hereinafter, an embodiment in which the present invention is applied to an intake manifold of an in-line four-cylinder engine for automobiles (hereinafter referred to as an engine) will be described in detail with reference to the drawings. In the description of each member, up, down, left, and right, front and back are indicated by arrows in FIG. 2, and positions and directions are indicated along these.

As shown in FIG. 1, the engine 1 according to this embodiment is mounted horizontally on the front side of a vehicle body of a right-hand drive type vehicle 2 so that the intake side is rearward. The intake manifold side wall surface 3a is fastened with a resin-made (vibration welded product made of resin) leaning forward at a position to the right (close to the driver's seat 4) with respect to the vehicle body center line CL. ing. A throttle body 5 is connected to the intake manifold 10, and fresh air from an air cleaner (not shown) is introduced into the intake manifold 10 through the throttle body 5. A fuel pipe 6 is piped near the engine 1 above the intake manifold 10, and a refrigerant pipe 7 for an air conditioner is piped behind the fuel pipe 6. Reference numeral 9 in FIG. 1 indicates a passenger seat.

<Intake manifold>
As shown in FIG. 2, the intake manifold 10 includes an intake air introduction portion 11 in which the throttle body 5 is fastened to a leftmost mounting flange 11 a, an intake chamber 12 into which fresh air from the intake air introduction portion 11 flows, and an intake chamber 12. A branch pipe portion 13 that guides the fresh air inside to the intake port (not shown) of each cylinder of the engine 1, and a sound insulation cover 15 is fastened to the rear surface of the branch pipe portion 13 by four screws 16. ing. As shown in FIG. 4, a pair of left and right protection plates 21 and 22 are integrally formed in the branch pipe portion 13 so as to separate the fuel pipe 6 and the refrigerant pipe 7. The protection plates 21 and 22 are erected on the upper surface of the branch pipe portion 13 via the bracket 23 so as to extend in the left-right direction, and the reinforcing ribs 25 and 26 are respectively provided between the front and rear surfaces of the protection plates 21 and 22. Is provided.

  The sound insulation cover 15 is an injection-molded product made of heat-resistant resin. As shown in FIG. 3, the vertical dimension L1 of the right part (the part near the driver seat 4) is the left part (the part near the vehicle body center line CL) ) Is set longer than the vertical dimension L2, the area of the right part is significantly larger than the area of the left part. As shown in FIG. 4, a sound absorbing material 17 made of heat-resistant foamed resin (or glass wool) and closely attached to the rear surface of the branch pipe portion 13 in the assembled state is held inside the sound insulating cover 15. . The sound insulation cover 15 is configured to shield the upper portion of the intake manifold 10 from the driver's ear, because the intake manifold 10 is tilted forward.

<< Operation of Embodiment >>
When the driver gets into the automobile 2 and starts the engine 1, engine operating noise (fuel injector drive noise and combustion noise) is generated in the engine 1, and this engine operating noise vibrates the intake manifold 10 by solid conduction. Alternatively, the light is radiated from the rear surface of the branch pipe portion 13 by passing through the intake manifold 10.

  However, in the case of this embodiment, since the sound insulation cover 15 is attached to the rear surface of the branch pipe portion 13 and the area of the right side portion of the sound insulation cover 15 is increased, Most of the engine operating noise radiated from a nearby part is absorbed by the sound absorbing material 17 and is blocked by the sound insulating cover 15. Since the intake manifold 10 is inclined forward, the sound insulating cover 15 shields most of the intake manifold 10 from the driver while having a relatively small area as shown in FIG. be able to. As a result, the level of engine operation noise felt by the driver is suppressed to a very low level, making it difficult to concentrate on driving operations and to prevent conversation with the passenger on the passenger seat 9 side. On the other hand, since the intake manifold 10 is located to the right of the vehicle body center line CL (that is, closer to the driver's seat 4), even if the area of the left portion of the sound insulation cover 15 is small, the passenger on the passenger seat 9 side has a large occupant. There is no driving noise.

  In addition, since the sound insulation cover 15 has a smaller area on the left side, the effect of increasing the intake air temperature is smaller than that of a conventional cover that covers the entire intake manifold, resulting in a decrease in output due to a decrease in charging efficiency. Less is. Furthermore, since the overall size of the sound insulation cover 15 is relatively small, the number of screws 16 for fastening to the intake manifold 10 can be reduced to four.

  On the other hand, when the automobile 2 collides with another vehicle or a building (for example, a median strip), the engine 1 moves rearward and the fuel pipe 6 and the refrigerant pipe 7 (or a vehicle body panel such as a bulkhead) approach each other. There is a case. However, in this embodiment, since the protective plates 21 and 22 and the reinforcing rib 25 are interposed between the fuel pipe 6 and the refrigerant pipe 7, as shown in FIG. Direct contact and collision are prevented, and fuel leakage caused by damage to the fuel pipe 6 is effectively suppressed. Further, since the reinforcing ribs 25 and 26 are provided between the bracket 23 and the protective pipes 21 and 22 are not easily bent even if the refrigerant pipe 7 collides, the fuel pipe 6 and the protective plates 21 and 22 and the reinforcing rib 25 are not bent. (That is, the fuel pipe 6 is more reliably protected).

  This is the end of the description of specific embodiments. However, aspects of the present invention are not limited to these embodiments. For example, in the above-described embodiment, the present invention is applied to an intake manifold of a right-hand drive vehicle, but can naturally be applied to a left-hand drive vehicle. In the above embodiment, the intake manifold and the sound insulation cover are resin molded products. However, these may be aluminum alloy die cast products or steel plate press molded products, and the same effect can be obtained in that case. In addition, the specific shapes and the like of the intake manifold and the sound insulation cover can be set as appropriate without departing from the spirit of the present invention.

1 Engine 2 Car 4 Driver's seat 6 Fuel pipe
DESCRIPTION OF SYMBOLS 10 Intake manifold 13 Branch pipe part 15 Sound insulation cover 16 Screw 17 Sound absorption material 21,22 Protective plate CL Vehicle body center line L1 Vertical dimension of one side L2 Vertical dimension of the other side

Claims (1)

An intake manifold attached to a rear intake side engine mounted on the front part of a car body and having a sound insulation cover attached to the rear part thereof,
The intake manifold is biased toward the driver's seat in the left-right direction with respect to the vehicle center line,
The intake manifold according to claim 1, wherein the sound insulation cover is set such that a vertical dimension on the driver's seat side is larger than a vertical dimension on the other side.

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