JP2005076589A - Intake device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake device for an internal combustion engine having reduced radiation sounds leaking from a sound absorbing material and a higher degree of freedom in engine room layout. <P>SOLUTION: The intake device for the internal combustion engine comprises the sound absorbing material 42 arranged on the upper or lower side of an air cleaner element 40. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

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

In an intake system of an internal combustion engine, noise is generated due to pulsation, airflow noise, and the like caused by intake of the internal combustion engine.
In order to suppress this noise, there are examples in which a large number of small holes are provided in a part of the suction pipe of the air cleaner, and a sound absorbing material is provided around the small holes (see, for example, Patent Document 1 and Patent Document 2).

JP-A-9-88749 JP-A-53-148617

Patent Document 1 discloses a configuration in which a sound-absorbing material is provided in a sound-absorbing duct portion that is in contact with the air cleaner at a part of the intake-side reference duct that protrudes laterally from the air cleaner chamber.
Further, in Patent Document 2, a suction pipe is fitted and inserted into the air cleaner case in front of the air cleaner element obliquely and vertically from above, and a plurality of small holes penetrating the upper wall of the air cleaner case of the suction pipe are provided. A structure is disclosed in which a sound absorbing material is provided around the perforated portion and the outer periphery thereof is covered by a holder.

  A suction pipe (or duct) for introducing air into the air cleaner case extends sideways from the normal air cleaner case as in Patent Document 1, and even when fitted into the air cleaner case, the air cleaner as in Patent Document 2 is used. It is generally located laterally with respect to the element.

  Therefore, the sound absorbing material provided around the suction pipe is also disposed laterally with respect to the air cleaner element, and the sound absorbing material is provided so as to protrude outside even when the suction pipe is fitted into the air cleaner case.

Even if the suction pipe is located outside the air cleaner case, as well as when the suction pipe is inserted into the air cleaner case, if the sound absorbing material is disposed laterally with respect to the air cleaner element, the space in the engine room where the space is limited is limited. The degree of freedom of layout will be regulated.
Moreover, the radiated sound leaking from the sound absorbing material cannot be reduced by the air cleaner element.

  The present invention has been made in view of the above points, and a purpose of the present invention is to provide an intake device for an internal combustion engine that can reduce the radiated sound leaking from the sound absorbing material and can improve the degree of freedom of layout in the engine room. There is in point to offer.

  In order to achieve the above object, the invention according to claim 1 is an intake device for an internal combustion engine in which a sound absorbing material is disposed above or below the air cleaner element.

Since the sound absorbing material is located above or below the air cleaner element and is not located on the side, it is possible to improve the degree of freedom of layout in the engine room and to reduce the radiated sound leaking from the sound absorbing material by the air cleaner element. be able to.
When the sound absorbing material is arranged below the air cleaner element, the sound emitted toward the passenger compartment can be particularly reduced by the air cleaner element and the air cleaner case.

  According to a second aspect of the present invention, in the intake device for an internal combustion engine according to the first aspect, the sound absorbing material is disposed inside an air cleaner case.

  The sound absorbing material located on the upper or lower side of the air cleaner element is further arranged inside the air cleaner case, so that the outer wall of the air cleaner case functions as a sound insulating wall, and the radiation sound to the outside can be further reduced. The degree of freedom of layout in the engine room can be further improved by being made compact.

  According to a third aspect of the present invention, there is provided an intake device for an internal combustion engine in which a sound absorbing material is disposed on the upstream side or the downstream side of the air cleaner element inside the air cleaner case.

  By arranging a sound-absorbing material in the air cleaner case on the upstream side or downstream side of the air cleaner element, the outer wall of the air cleaner case functions as a sound insulating wall, further reducing the sound emitted to the outside and making it more compact. The degree of freedom of layout in the engine room can be improved.

  According to a fourth aspect of the present invention, in the intake device for an internal combustion engine according to any one of the first to third aspects, the sound absorbing material is disposed in parallel to the air cleaner element. To do.

  By arranging the sound absorbing material in parallel with the air cleaner element, the sound absorbing material can be arranged more compactly, and the degree of freedom of layout in the engine room can be further improved.

  According to a fifth aspect of the present invention, there is provided an intake device for an internal combustion engine in which a sound absorbing material is disposed between an air cleaner element and a transmission.

  A sound absorbing material can be disposed in the space between the air cleaner element and the transmission to effectively utilize the space, and the degree of freedom of layout in the engine room is increased.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view of a part of an engine compartment in a four-wheeled vehicle equipped with an internal combustion engine 1 to which an intake device 10 according to the present embodiment is applied, as viewed from the upper front side of the vehicle body.

In FIG. 1, the direction of the arrow F is the front of the vehicle body, and the left and right are defined based on the posture facing the front of the vehicle.
The internal combustion engine 1 is mounted horizontally in an engine room with a crankshaft oriented in the left-right direction, and a cylinder block 3, a cylinder head block 4, a cylinder head cover 5 above a crankcase (not shown) of the internal combustion engine 1. Are combined in one piece.

A transmission 6 is disposed to bulge to the left side (right side in the drawings of FIGS. 1 and 2) of the cylinder block 3 of the internal combustion engine 1, and is supported so as to cover the intercooler 20 above the cylinder head cover 5.
An air cleaner 11 is disposed in the space above the transmission 6 and on the left side of the cylinder head block 4, the cylinder head cover 5 and the intercooler 20.

The air cleaner 11 includes upper and lower split resin air cleaner cases 12 and 13, and an intake duct 15 is formed in a suction opening 12 b (see FIG. 2) that protrudes forward of the front wall 12 a of the box-shaped lower air cleaner case 12. Are connected.
The intake duct 15 is bent upward from the downstream connection end 15b connected to the intake opening 12b, extends to the upper height of the upper air cleaner case 13, and is bent rightward to reach the upstream opening end 15a.

  A flexible connection in which a discharge opening 13b protrudes forward on the right half front wall 13a recessed rearward of the front wall of the upper air cleaner case 13 (see FIG. 2), and an upstream connection end 16a is connected to the discharge opening 13b. A pipe 16 extends forward, passes through the inside of the upper bent portion of the intake duct 15, bends rightward, extends substantially horizontally along the front surface of the cylinder head block 4, and is connected to the connecting pipe 17. .

  The connecting pipe 17 further extends to the right and is connected to a turbocharger (not shown). The turbocharger and the upstream tank on the right side of the intercooler 20 are connected via a connecting pipe (not shown).

A connecting pipe 20b extends leftward from a downstream tank 20a on the left side of the intercooler 20, and a connecting pipe 22 is connected to the connecting pipe 20b via a flexible connecting pipe 21.
The connecting pipe 22 extending leftward is bent and directed rightward, and is connected to the throttle body (not shown), and the throttle body and the intake manifold are connected.

  The connecting pipe 20b extending from the downstream tank 20a has a branch pipe 20c branched forward and provided with a relief valve 25, and the relief pipe 26 extends from the relief valve 25 to the upstream connecting pipe 17.

  The intake device 10 of the internal combustion engine 1 is configured as described above, and the air sucked into the air cleaner 11 through the intake duct 15 is cleaned and passes through the connecting pipe 17 from the flexible connecting pipe 16. Then, it is supercharged by the turbocharger, cooled by the intercooler 20, pressure-adjusted by the relief valve 25, and supplied from the intake manifold to the combustion chamber of the internal combustion engine 1 through the throttle body.

  Referring to FIG. 2, the air cleaner 11 disposed above the transmission 6 has a pair of brackets 12c and 12d protruding rightward from the upper front and rear ends of the right side wall of the box-shaped lower air cleaner case 12, and the left side wall. A bracket 12e protrudes from the center of the lower part to the left.

  On the other hand, a longitudinally long mounting stay 30 is fixed to the left side surface of the cylinder head block 4 of the internal combustion engine 1 by bolts 31 at a plurality of front and rear locations (the front bolt 31 is fastened together with a stay 34 for supporting an intercooler). The pair of brackets 12c and 12d of the air cleaner 11 are supported on the mounting stay 30 via rubber 32, and are attached by bolts 33 with the rubber 32 interposed therebetween.

  A support stay 35 is fixedly erected on the upper surface of the transmission 6 by bolts 36, and a mounting stay 37 bent in a crank shape is welded to a portion protruding above the mounting stay 35. The bracket 12e of the air cleaner 11 is supported by a portion via a rubber 38, and is attached by bolts 39 with the rubber 38 interposed therebetween.

  Accordingly, the air cleaner 11 is attached to a mounting stay 30 in which a pair of brackets 12c and 12d protruding to the right of the lower air cleaner case 12 is fixed to the left surface of the cylinder head block 4 via the rubber 32, and protrudes to the left. The bracket 12e is attached to a mounting stay 36 erected on the upper surface of the transmission 6 via a rubber 37, and is supported by rubber mounts at the above three locations.

  Thus, the air cleaner 11 that is rubber-mounted and supported above the transmission 6 is supported with a gap between the lower surface of the lower air cleaner case 12 and the upper surface of the transmission 6.

  As shown in the cross-sectional view of FIG. 3, the internal structure of the air cleaner 11 is such that the peripheral seal portion 40a is sandwiched between the mating surfaces of the lower air cleaner case 12 and the upper air cleaner case 13 so that the air cleaner element 40 has a lower dust side Sd. The upper clean side Sc is partitioned substantially horizontally.

A suction pipe 41 having the same diameter as the suction opening 12b is provided on the dust side Sd in the lower air cleaner case 12 so as to be coaxial and continuous with the suction opening 12b.
The suction pipe 41 is made of resin, and a pair of front and rear flanges 41a and 41b are formed to protrude on the outer peripheral surface. A large number of rectangular holes 41c are formed in the peripheral wall of the suction pipe between the flanges 41a and 41b. It has a shape.

A sound absorbing material 42 made of non-woven fabric or glass wool is wound around the outer periphery of the lattice-shaped portion between the flanges 41a and 41b of the suction pipe 41.
A resin holder 43 having a cylindrical shape covering the sound absorbing material 42 from the outside is covered.

  The holder 43 has a small diameter portion 43a having the same diameter as the suction pipe 41 having a rear end eccentrically deviated somewhat downward via the stepped portion 43b, and is rearward of the suction pipe 41 around which the sound absorbing material 42 is wound. The stepped portion 43b is brought into contact with the rear surface of the rear flange 41b and a part of the small diameter portion 43a is bitten into the suction pipe 41 to be integrated.

Then, the sound absorbing material 42 is sandwiched between the holder 43 and the lattice portion between the flanges 41 a and 41 b of the suction pipe 41.
The sound absorbing material 42 is deformed so that the lower side is narrower than the upper side.
By deforming the lower side of the sound absorbing material 42 to be narrower than the upper side, the degree of freedom of layout in the engine room is further improved.

  The holder 43 that holds the suction pipe 41 via the sound absorbing material 42 aligns the suction pipe 41 coaxially with the suction opening 12b in the lower air cleaner case 12, and has a locking hole 43c formed at the upper part of the front opening end. Is fixed to the protrusion 12f formed on the inner step of the lower air cleaner case 12 so that the tip of the protrusion 12f is melted and caulked.

Thus, the sound absorbing material 42 is sandwiched between the suction pipe 41 and the holder 43 and disposed in the dust side Sd in the lower air cleaner case 12 so as to be oriented in the horizontal direction.
Therefore, the sound absorbing material 42 is parallel to the horizontal air cleaner element 40.

  Intake sound generated when air is sucked from the intake duct 15 into the air cleaner 11 through the suction pipe 41 is sound-absorbing material wound around a lattice portion in which a large number of rectangular holes 41c of the suction pipe 41 are formed. Absorbed by 42.

  Since the air cleaner element 40 covers the upper side of the sound absorbing material 42, particularly the upward radiated sound of the radiated sound leaking from the sound absorbing material 42 is absorbed by the air cleaner element 40, and the entire sound absorbing material 42 is entirely air cleaner cases 12, 13. Since it is housed inside, the outer walls of the air cleaner cases 12 and 13 function as sound insulation walls, and the sound that leaks to the outside is further reduced.

Since the sound absorbing material 42 is disposed in parallel to the lower side of the air cleaner element 40, the degree of freedom of layout in the limited engine room can be improved.
Further, since the sound absorbing material 42 is disposed on the upstream dust side Sd of the air cleaner element 40 and is housed in the air cleaner cases 12 and 13, the degree of freedom of layout in the engine room is further improved.

  Since the air cleaner 11 is disposed above the transmission 6, and the sound absorbing material 42 is disposed by effectively utilizing the space between the air cleaner element 40 and the transmission 6 in the air cleaner 11, the layout in the engine room is free. The degree is further improved.

Next, an air cleaner 51 of an intake device according to another embodiment will be described with reference to FIG.
The air cleaner 51 has a structure in which the air cleaner 11 of the above-described embodiment is turned upside down.

  That is, the peripheral seal portion 60a is sandwiched between the mating surfaces of the upper air cleaner case 52 and the lower air cleaner case 53, and the air cleaner element 60 is stretched substantially horizontally to partition the upper dust side Sd and the lower clean side Sc. A suction opening 52b protrudes forward from the front wall of the upper air cleaner case 52, and a suction pipe 61 is continuously provided substantially horizontally and coaxially with the suction opening 52b.

The suction pipe 61 is held by a holder 63 around which a sound absorbing material 62 is wound around a number of rectangular hole forming portions.
The lower air cleaner case 53 has a discharge opening 53b protruding forward from the front wall.

  The air cleaner 51 is configured as described above, and the intake sound generated when air is sucked into the air cleaner 51 from the suction opening 52b through the suction pipe 61 is absorbed by the sound absorbing material 62.

  And since the air cleaner element 60 is stretched in parallel below the sound absorbing material 62, the radiated sound leaking from the sound absorbing material 62 is absorbed by the air cleaner element 60, and the sound absorbing material 62 as a whole. Is housed in the air cleaner cases 52 and 53, the outer walls of the air cleaner cases 52 and 53 function as sound insulation walls, and the sound leaking to the outside is further reduced.

Since the sound absorbing material 62 is disposed in parallel to the upper side of the air cleaner element 60, the degree of freedom of layout in a limited engine room can be improved.
In addition, since the sound absorbing material 62 is disposed on the upstream dust side Sd of the air cleaner element 60 and is housed in the air cleaner cases 52 and 53, the degree of freedom of layout in the engine room is further improved.

  The present invention is applicable to all intake devices for internal combustion engines.

1 is a perspective view showing a part of an engine room in a four-wheeled vehicle equipped with an internal combustion engine to which an intake device according to an embodiment of the present invention is applied. It is a perspective view which shows the attachment structure of an air cleaner. It is sectional drawing which shows the internal structure of an air cleaner. It is sectional drawing which shows the internal structure of the air cleaner which concerns on another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 3 ... Cylinder block, 4 ... Cylinder head block, 5 ... Cylinder head cover, 6 ... Transmission,
10 ... Intake device, 11 ... Air cleaner, 12 ... Lower air cleaner case, 13 ... Upper air cleaner case, 15 ... Intake duct, 16 ... Flexible connecting pipe, 17 ... Connecting pipe, 20 ... Intercooler, 21 ... Flexible connecting Pipe, 22 ... Connection pipe, 25 ... Relief valve, 26 ... Relief pipe,
30 ... Mounting stay, 31 ... Bolt, 32 ... Rubber, 33 ... Bolt, 34 ... Stay, 35 ... Support stay, 36 ... Bolt, 37 ... Mounting stay, 38 ... Rubber, 39 ... Bolt,
40 ... Air cleaner element, 41 ... Suction pipe, 42 ... Sound absorbing material, 43 ... Holder,
51 ... Air cleaner, 52 ... Upper air cleaner case, 53 ... Lower air cleaner case,
60 ... Air cleaner element, 61 ... Suction pipe, 62 ... Sound absorbing material, 63 ... Holder.

Claims (5)

  An intake device for an internal combustion engine, characterized in that a sound absorbing material is disposed above or below the air cleaner element.   The intake device for an internal combustion engine according to claim 1, wherein the sound absorbing material is disposed inside an air cleaner case.   An intake device for an internal combustion engine, characterized in that a sound absorbing material is disposed inside an air cleaner case and upstream or downstream of an air cleaner element.   The intake device for an internal combustion engine according to any one of claims 1 to 3, wherein the sound absorbing material is disposed in parallel to the air cleaner element. An intake device for an internal combustion engine, characterized in that a sound absorbing material is disposed between the air cleaner element and the transmission.

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