JP2008223497A - Intake device for engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake device for an engine capable of making a constitution compact while not requiring a time and labor of assembling and enhancing a vibration-proof property. <P>SOLUTION: An intake manifold 10 is provided with a plurality of branch pipes 14 communicating with an intake port 4a of the side surface of a cylinder head 4 above a surge tank 11, and an air cleaner 20 is provided with an air cleaner case 21 having a bottom wall 22 for connecting the branch pipe 14 in an engine cylinder row direction and a side wall 23 integrally formed with the bottom wall 22; and an air cleaner cover 31 for closing an opening of the air cleaner case. On the air cleaner 20, an extended housing 20B extending from one end side in the engine cylinder row direction to the outside, and on the lower surface of the extended housing, a downstream opening 28 opened to a lower part is formed. On the surge tank 11, an intake upstream 12 is provided, and the downstream opening 28 and the intake upstream part 12 communicate with each other through a duct 40 below the extended housing part 20B. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an intake device for an engine, and more particularly, to an intake device for an engine in which an air cleaner is disposed above an intake manifold.

2. Description of the Related Art An intake device for a vehicle engine has a configuration in which an intake manifold is disposed on a side portion of a cylinder head and an air cleaner is disposed on an upper portion of the intake manifold (see, for example, Patent Document 1).
The intake manifold of the intake device described in Patent Document 1 includes a plurality of parallel branch pipes that communicate with an intake port that opens to the side surface of the cylinder head, and a surge tank that joins the plurality of branch pipes. Each branch pipe extends spirally from the intake port to a surge tank positioned below the intake port.

  An air cleaner for an intake device described in Patent Document 1 includes a concave air cleaner case that is airtightly attached to an upper portion of an intake manifold, and an air cleaner cover that closes an opening of the air cleaner case. The air cleaner case and the air cleaner cover define a dusty chamber in the upper part of the branch pipe and a clean chamber in communication with the dusty chamber through a filter element in the upper part of the branch pipe.

  The air cleaner case is integrally formed with a cylindrical passage that extends outward from the clean chamber in the cylinder row direction and opens to the side, and this passage is connected to the lower surge tank by a substantially U-shaped duct. It is connected. The air cleaner cover is formed with an extension portion so as to cover the upper part of the above-described passage and duct.

Japanese National Patent Publication No. 11-511834

However, although the air cleaner is arranged on the upper part of the intake manifold and the configuration can be made compact, the air cleaner case and the intake manifold are separate from each other, and the number of parts is large and the assembly is troublesome. There was a problem of hanging.
Further, in the above-described engine intake device, the extension provided on the air cleaner cover is configured to cover the passage extending outward from the clean chamber and the upper portion of the duct connected to the passage, so that the appearance is improved. Since this passage is a structure separate from the extension and is formed integrally with the air cleaner case, the structure becomes complicated, and vibration and noise are generated in the extension and passage due to engine vibration. There was a problem that it would occur.

  The present invention has been made to solve the above-described problems, and provides an engine air intake apparatus that has a compact configuration, requires no assembling work, and has improved vibration damping. The purpose is that.

  In order to achieve the above object, the present invention provides an intake system for an engine including an intake manifold and an air cleaner disposed above the intake manifold. The intake manifold includes a surge tank and the surge tank. A plurality of branch pipes branched from the upper side of the surge tank and communicated with the intake port on the side of the engine body, and the air cleaner includes a bottom wall portion connecting the outer peripheral walls of the plurality of branch pipes in the direction of the engine cylinder row and the bottom An air cleaner case that opens upward by a side wall formed integrally with the wall and partitions the dusty chamber, and an air cleaner cover that blocks the opening of the air cleaner case and defines a clean chamber that communicates with the dusty chamber via the filter element. The air cleaner extends outward from one end side in the engine cylinder row direction of the clean chamber. An extension housing portion that divides the extension space portion is provided, and a downstream opening that opens downward is provided on the lower surface of the extension housing portion. And a downstream opening of the extension housing portion and an intake upstream portion of the surge tank communicate with each other via a duct below the extension housing portion.

  According to the present invention configured as described above, the air cleaner case of the intake device for the engine has the bottom wall portion formed by connecting the plurality of branch pipes of the intake manifold in the direction of the engine cylinder row. As a result, the air cleaner case and the intake manifold are integrally formed, and modularization with a small number of parts can be achieved, and the manufacturing cost can be reduced by eliminating the work of assembling. Also, with this configuration, the vertical height of the intake manifold and the air cleaner can be kept low, and the intake device can be compactly arranged in the engine room to save space.

  Further, in the present invention, an extension housing portion is formed by extending the air cleaner cover and the air cleaner case in the direction of the engine cylinder row, and the downstream opening formed in the lower portion of the extension housing portion is connected to the intake manifold via the duct. It is connected to the intake upstream. As a result, the air cleaner cover can cover the intake manifold including the duct and the members attached to the duct (for example, the throttle body) in a top view, so that the appearance from above the engine can be improved. Become.

  In the present invention, preferably, the extension housing portion is formed by extending an air cleaner cover and an air cleaner case in the direction of the engine cylinder row. According to the present invention configured as described above, since the extension housing itself is a structure that partitions the extension space portion, it is possible to suppress vibration and noise from being generated due to engine vibration, and to improve damping performance. Can do.

  In the present invention, preferably, the air cleaner cover has a decorative cover portion extending so as to cover the upper surface of the engine body. According to the present invention configured as described above, the air cleaner cover covers not only the intake manifold but also the upper surface of the engine body, so that the appearance can be further improved.

  In the present invention, preferably, a resonator chamber communicating with the clean chamber is formed at the lower portion of the decorative cover portion. According to the present invention configured as described above, since the resonator chamber which is the intake sound suppression unit is covered with the decorative cover, the resonator chamber can also be arranged compactly while maintaining the appearance.

  In the present invention, preferably, a solenoid valve is disposed on the side of the downstream opening at the lower portion of the extension housing portion. According to the present invention configured as described above, a solenoid valve used for engine control (for example, an intake flow control valve used for controlling negative pressure) is disposed on the side of the downstream opening at the lower part of the extension housing. It can be arranged in a compact manner while maintaining the appearance.

  In the present invention, preferably, the engine body has a cylinder row direction along the vehicle width direction and an intake port disposed on the front side of the vehicle. According to the present invention configured in this way, it is possible to improve the appearance in the engine room.

  According to the intake device for an engine of the present invention, the configuration can be made compact, the assembly work is not required, and the damping performance can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1 is a front view of the intake device of the present invention, FIG. 2 is a right side view of the intake device of FIG. 1, FIG. 3 is a left side view of the intake device of FIG. 1, and FIG. 5 is a cross-sectional view taken along line VV in FIG. 1, FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 1, and FIG. 7 is a cross-sectional view taken along line VII-VII in FIG.
As shown in FIG. 2, the intake device 1 is attached to an in-line four-cylinder engine 2 having an engine body including a cylinder block 3 and a cylinder head 4 fixed on the cylinder block 3.
As shown in FIGS. 1 to 4, the intake device 1 includes an intake manifold 10 and an air cleaner 20 provided on the upper portion of the intake manifold 10.

The engine 2 is configured to be disposed in the engine room so that the cylinder row direction faces the vehicle width direction. When the engine 2 is disposed in the engine room, the intake manifold 10 is positioned in front of the engine 2 in the vehicle. (See FIG. 2).
The intake manifold 10 includes a surge tank 11 positioned in front of the engine body and a branch pipe 14 that branches from the surge tank 11 and communicates with the intake port 4 a of the cylinder head 4. The intake manifold 10 is formed by resin molding.

The surge tank 11 is a hollow member having a substantially semicircular sectional shape located below the intake port 4a of the cylinder head 4 and introduces clean air supplied from the air cleaner 20 side into the internal space from the intake pipe 12, The cylinder head 4 is supplied through four branch pipes 14 arranged in the cylinder row direction.
The intake pipe 12 extends outward in the vehicle width direction from the left side surface (side surface on the engine rear side) of the surge tank 11 in the vehicle width direction (cylinder row direction).

  The plurality of branch pipes 14 branch corresponding to the respective cylinders on the rear side of the surge tank 11, and extend upward in a spiral shape in parallel through the outer periphery of the surge tank 11. The upper ends of the plurality of branch pipes 14 are curved so that the interval between the internal passages of the branch pipes 14 is expanded in the cylinder row direction in accordance with the arrangement interval of the intake ports 4 a provided in the cylinder head 4. A flange portion 15 that is an attachment portion to the cylinder head 4 is formed at the distal end portion of the branch pipe 14, and the distal end portion of the branch pipe 14 is connected to the cylinder row direction by the flange portion 15. The connecting portions between the four branch pipes 14 and the flange portion 15 are arranged linearly in the vehicle width direction at substantially equal intervals.

  The flange portion 15 has a substantially rectangular cross section, and has five fastening holes 16 for attachment penetrating in the thickness direction (vehicle longitudinal direction) (see FIG. 7). In the five fastening holes 16, two even numbered fastening holes 16A (upper fastening holes) counted from the vehicle right side (front of the engine) are more odd than three odd numbered fastening holes 16B (lower fastening holes). Are also arranged at positions shifted upward, and a zigzag arrangement as a whole.

  The upper fastening hole 16A is located between the first and second branch pipes 14 and the flange portion 15 from the vehicle right side (front of the engine), and the third and fourth branches from the vehicle right side (front of the engine). It is formed at a position sandwiched between connecting portions of the tube 14 and the flange portion 15. The lower fastening holes 16B are formed at positions slightly shifted downward from the connection portion between the branch pipe 14 and the flange portion 15, and are arranged linearly at substantially equal intervals.

  As shown in FIGS. 1, 5, and 7, the flange portion 15 is formed with a cylindrical wall portion 17 so as to surround the upper fastening hole 16A. The cylindrical wall portion 17 extends forward from the flange portion 15 to the vehicle forward position of the branch pipe 14 along the axial direction of the upper fastening hole 16A. On the other hand, a cylindrical wall portion is not formed in the lower fastening hole 16B.

  The intake manifold 10 is fixed to the engine body by inserting screws into the upper fastening holes 16 </ b> A and the lower fastening holes 16 </ b> B and screwing the flange portions 15 to the side of the cylinder head 4 on the front side of the vehicle. A screw can be inserted into the upper fastening hole 16A from the front of the vehicle through a cylindrical wall portion 17 formed around the upper fastening hole 16A. A screw can be inserted into the lower fastening hole 16B from the front of the vehicle through the space between the branch pipes 14 extending in the vehicle width direction. When the flange portion 15 is fixed to the cylinder head 4, each branch pipe 14 is communicated with the intake port 4a of the cylinder head 4 arranged in the vehicle width direction.

  The air cleaner 20 includes an air cleaner case 21 that forms a concave internal space and opens upward, an air cleaner cover 31 that closes the opening of the air cleaner case 21, and a filter element 29 disposed inside these. The air cleaner case 21 and the air cleaner cover 31 are resin-molded.

The air cleaner 20 has a dusty chamber 21a, a clean chamber 31a, an extended space 31b, and a resonator chamber 31c defined therein by an air cleaner case 21 and an air cleaner cover 31. The dusty chamber 21 a and the clean chamber 31 a are stacked one above the other, separated by the filter element 29, and communicated with each other via the filter element 29.
The air cleaner 20 has two parts on the left and right, that is, a main housing part 20A and an extended housing part 20B. The main housing portion 20A includes a portion constituting a dusty chamber 21a and a clean chamber 31a mainly located at the upper part of the branch pipe 14, and the extension housing portion 20B is mainly located at the upper left side of the branch pipe 14 in the vehicle. The extended space part 31b to be included is included. The resonator chamber 31c is formed across the main housing portion 20A and the extended housing portion 20B.

As shown in FIGS. 5 to 7, the air cleaner case 21 is a concave member as a whole, and is integrally molded with the branch pipe 14, the flange portion 15, and the cylindrical wall portion 17 of the intake manifold 10.
The air cleaner case 21 includes a bottom wall portion 22 located above the branch pipe 14, a side wall portion 23 that extends upward from the edge of the bottom wall portion 22, and a vehicle of the cylinder head 4 from the upper end of the side wall portion 23. An extended bottom wall portion 24 extending to the left side of the vehicle beyond the left side surface (engine rear end surface) and an extended side wall portion 25 extending upward from the end portion of the extended bottom wall portion 24 are provided. The bottom wall portion 22 and the side wall portion 23 form a flat dusty chamber 21a extending in the vehicle width direction and the vehicle front-rear direction.

The bottom wall portion 22 has a configuration in which the four branch pipes 14 and the cylindrical wall portion 17 are connected in the cylinder row direction by a connecting portion 22a. That is, the bottom wall portion 22 is formed in a substantially rectangular shape in a top view by the upper portion of the outer peripheral wall of the branch pipe 14, the upper portion of the outer peripheral wall of the cylindrical wall portion 17, and the connecting portion 22a that connects them.
The side wall portion 23 and the extended side wall portion 25 rise up from the periphery of the bottom wall portion 22 and the extended bottom wall portion 24 to the same height, and a flange portion 26 for connecting to the air cleaner cover 31 is formed on the outer periphery of the upper end. A stepped portion 27 protruding upward from the extended bottom wall portion 24 is formed at a connecting portion between the side wall portion 23 and the extended bottom wall portion 24.
A tubular downstream opening 28 that protrudes downward is integrally formed in the vicinity of the vehicle left end portion of the extended bottom wall portion 24 so as to protrude downward.

A filter element 29 is disposed in the opening above the bottom wall portion 22 so as to close the opening. The filter element 29 is disposed on the upper portion of the dusty chamber 21a and extends in the vehicle width direction and the vehicle front-rear direction.
An outside air introduction portion 23a is formed at the vehicle right end of the air cleaner case 21 so as to bulge out of the vehicle and protrude forward of the vehicle. The outside air introduction part 23 a is open to the front of the vehicle and communicates with the outside air introduction opening part 23 b formed in the side wall part 23. Thereby, outside air can be introduced into the internal dusty chamber 21a from the vehicle right side of the air cleaner case 21.

  The air cleaner cover 31 is a lid-like member that opens downward, and has a rectangular upper wall portion 32 as viewed from above, a side wall portion 33 that extends downward from the left and right ends of the upper wall portion 32, and the rear side of the air cleaner case 21. Corresponding to the side wall portion 23 on the side, a rear wall portion 34 extending downward from the vicinity of the middle portion of the upper wall portion 32 in the vehicle longitudinal direction is provided. An intermediate wall 35 is formed corresponding to the stepped portion 27 of the air cleaner case 21 so as to extend downward from the upper wall portion 32 substantially parallel to the left and right side wall portions 33. The intermediate wall 35 is formed with an air outlet opening 35a that communicates between the left and right sides. Of the upper wall portion 32, the vehicle right side portion from the intermediate wall 35 is a main body portion 32 a located on the branch pipe 14, and the vehicle left side portion from the intermediate wall 35 extends to the vehicle left side from the branch pipe 14. The extended portion 32b.

The upper wall portion 32 is formed to be inclined so that the front side of the vehicle is lower than the rear side of the vehicle. At the front end of the upper wall portion 32, the lower end of the side wall portion 33, and the lower end of the rear wall portion 34, a flange portion 36 that is in contact with the flange portion 26 of the air cleaner case 21 via a seal member is formed.
The flange portions 26 and 36 are formed with engaging portions 26 a and 36 a that are detachably engaged, and the air cleaner cover 31 can be attached to the air cleaner case 21 by engaging them.

The filter element 29 having a substantially rectangular outer shape when viewed from above is disposed in the air cleaner 20 while being sandwiched between the flange portion 26 and the flange portion 36 and between the step portion 27 and the lower end of the intermediate wall 35.
A clean chamber 31a, which is a flat internal space extending in the vehicle width direction and the vehicle front-rear direction, is defined by the filter element 29, the main body portion 32a of the upper wall portion 32, the side wall portion 33, the rear wall portion 34, and the intermediate wall 35. Further, it is a flat internal space extending in the vehicle width direction and the vehicle longitudinal direction by the extended bottom wall portion 24, the extended side wall portion 25, the extended portion 32b of the upper wall portion 32, the intermediate wall 35, the rear wall portion 34, and the side wall portion 33. The extended space portion 31b is partitioned so as to continue to the vehicle left side (the engine rear side) of the clean chamber 31a.

  As shown in FIGS. 4 to 7, the air cleaner cover 31 is formed with a cylindrical wall portion 37 extending in the vertical direction from the upper wall portion 32 to the flange portion 36 on the rear side of the vehicle. A fastening hole (not shown) penetrating in the vertical direction is formed in the bottom portion of the cylindrical wall portion 37, that is, the corresponding portion of the flange portion 36 and the flange portion 26, and a screw is inserted into the fastening hole. Thus, the air cleaner cover 31 and the air cleaner case 21 can be fixed to the upper surface side of the cylinder head 4.

  As shown in FIGS. 4 to 6, the upper wall portion 32 has a decorative cover portion 32 c that extends further to the rear of the vehicle than the connection portion with the rear wall portion 34. The decorative cover portion 32 c extends above the cylinder head 4 and covers the head cover 5 disposed on the upper surface of the cylinder head 4 and the connector portion 6 of the connection cord to the spark plug.

  Further, as shown in FIGS. 5 and 6, on the vehicle rear side of the rear wall portion 34, a lower surface of the decorative cover portion 32 c and a flange portion 36 formed at the lower end of the rear wall portion 34 are connected to each other. A second rear wall portion 38 is formed, and a second side wall portion 39 that closes both ends of the second rear wall portion 38 and the rear wall portion 34 in the vehicle width direction is formed. By the second rear wall portion 38 and the second side wall portion 39, a resonator chamber 31c, which is an intake sound suppression portion, is formed on the vehicle rear side of the rear wall portion 34. A communication opening 34a is formed in the vicinity of the vehicle right end of the rear wall portion 34, and the clean chamber 31a and the resonator chamber 31c communicate with each other through the communication opening 34a.

  As shown in FIG. 1, the air cleaner 20 and the intake manifold 10 are connected via a curved duct 40 and a throttle body 42. The downstream opening 28 extending downward from the air cleaner case 21 of the air cleaner 20 has an air flow sensor 44 attached to the side wall thereof, and a duct 40 connected to the lower end thereof. The duct 40 is bent to the right side of the vehicle, and the lower end of the duct 40 and the intake pipe 12 of the surge tank 11 are connected via a throttle body 42.

  As shown in FIG. 1, a negative pressure actuator 46 of a variable intake valve is attached to the branch pipe 14 of the intake manifold 10 on the side of the left side of the vehicle (rear of the engine) near the lowermost part. As shown in FIG. 2, a negative pressure actuator 48 of a swirl control valve (SCV) is attached to the side of the branch pipe 14 on the left side of the vehicle near the intake port 4a. Solenoid valves 47 and 49 for controlling these negative pressure actuators 46 and 48 are attached to the lower surface of the extended bottom wall portion 24 between the vehicle left side wall portion 23 and the downstream opening 28 of the air cleaner case 21. ing.

Next, the operation (effect) of the intake device according to the above-described embodiment will be described.
In the intake device 1 of the present embodiment, an air cleaner case 21 is formed integrally with the branch pipe 14 of the intake manifold 10. Specifically, the outer wall of the branch pipe 14 is connected in the horizontal direction by the connecting portion 22 a via the cylindrical wall portion 17, and constitutes the bottom wall portion 22 of the air cleaner case 21. For this reason, in the assembling work, the work of airtightly connecting the intake manifold 10 and the air cleaner case 21 is not required, so that the assembling work is not required and the manufacturing cost can be reduced. Further, by integrating the air cleaner case 21 and the branch pipe 14, the height in the vertical direction can be kept low, and the air cleaner case 21 and the branch pipe 14 can be arranged compactly in the engine room.

  Further, since the bottom wall portion 22 of the air cleaner case 21 has a structure in which the outer wall of the branch pipe 14 is connected in the horizontal direction by the connecting portion 22a via the cylindrical wall portion 17, only the outer wall of the branch pipe 14 is connected by the connecting portion 22a. The rigidity around the branch pipe 14 can be increased as compared with the configuration described above, and damage due to engine vibration or the like can be prevented.

  Outside air is introduced into the dusty chamber 21a from an outside air introduction portion 23a formed on the right side of the air cleaner 20 and passes through the filter element 29 from the dusty chamber 21a and enters the clean chamber 31a. The clean air that has entered the clean chamber 31a passes through the air outlet opening 35a, enters the extended space 31b formed on the left side of the vehicle (rear of the engine), and is sent out from the downstream opening 28 toward the lower side of the vehicle. As described above, the air cleaner 20 is configured such that the outside air that has entered from the right side of the vehicle is purified inside and exits from the left side of the vehicle as clean air. Accordingly, since the outside air passes through almost the entire area of the filter element 29 extending in the horizontal direction and moves to the clean chamber 31a, the dispersibility of the outside air in the dusty chamber 21a can be increased.

  Further, the air cleaner 20 has an outside air introduction opening 23b of the outside air introduction portion 23a formed at a position substantially above the branch pipe 14 and the cylindrical wall portion 17, so that the dusty chamber of the branch tube 14 and the cylindrical wall portion 17 is provided. The portion protruding into 21a is unlikely to become an intake resistance of the outside air flowing into the dusty chamber 21a from the outside air introduction opening 23b. Further, in the air cleaner 20, the bottom wall portion 22 and the filter element 29 are vertically opposed to each other with the outside air introduction opening portion 23b interposed therebetween, and the outside air flowing in from the outside air introduction portion 23a Heading toward the filter element 29 side above the vicinity of the portion 22. Thereby, the protrusion part of the branch pipe 14 and the cylindrical wall part 17 becomes difficult to become an intake resistance in the dusty chamber 21a. Thus, in the air cleaner 20 of the present embodiment, the intake resistance of the outside air flowing into the dusty chamber 21a is reduced.

In addition, the intake device 1 of the present embodiment has an extended housing portion 20B in which an air cleaner case 21 and an air cleaner cover 31 are formed to extend toward the vehicle outer side. Since the extended housing portion 20B is a portion formed integrally with the air cleaner case 21 and the air cleaner cover 31, the number of parts does not increase and the assembling work is facilitated.
As described above, the intake device 1 can be modularized by integrating the intake manifold 10 and the air cleaner 20, thereby reducing the number of components and saving space.

  Further, in the intake device 1 of the present embodiment, the extension housing part 20 </ b> B itself forms an extension space part 31 b that is a downstream part of the fluid passage in the air cleaner 20. Thereby, the member which comprises a channel | path separately is not required and a structure can be simplified. Further, since the extension housing portion 20B itself is a structure that constitutes a fluid passage, it is possible to improve vibration damping performance against engine vibration and the like.

  Further, in the intake device 1 of the present embodiment, the air cleaner cover 31 is disposed so as to protrude above the intake manifold 10 and the cylinder head 4, and includes an intake manifold including the negative pressure actuators 46 and 48 in a top view. 10 can cover almost the whole area and a part of the cylinder head 4.

Further, the extension housing portion 20B is formed with a downstream opening 28 protruding downward, and the clean air that has exited the air cleaner 20 is sucked through the duct 40 and the throttle body 42 connected to the downstream opening 28. It is configured to flow into the manifold 10.
With such a configuration, the portion constituting the extended housing portion 20B of the air cleaner cover 31 can cover the downstream opening 28, the duct 40, the throttle body 42, and the like. Furthermore, the air cleaner cover 31 can cover the connector portion 6 of the connection cord to the head cover 5 and the spark plug by a decorative cover portion 32c formed to extend rearward of the vehicle.

  In the intake device 1 of the present embodiment, solenoid valves 47 and 49 are attached to the lower surface of the extension housing portion 20B in the space between the downstream opening 28 and the side wall portion 23 constituting the dusty chamber 21a. Yes. Thus, in the intake device 1, the solenoid valves 47 and 49 can be arranged compactly while maintaining a good appearance.

In the intake device 1 of the present embodiment, a resonator chamber 31c is formed on the vehicle rear side of the clean chamber 31a via a rear wall portion 34. The resonator chamber 31c has a configuration in which an upper portion is covered with an air cleaner cover 31, and can suppress intake noise while maintaining a good appearance from above.
As described above, the air cleaner 20 can improve the appearance from above the engine by covering the lower arrangement member with the air cleaner cover 31.

It is a front view of the air intake device in the embodiment of the present invention. It is a right view of the intake device in the embodiment of the present invention. It is a left view of the intake device in the embodiment of the present invention. It is a top view of the air intake device in the embodiment of the present invention. It is the VV sectional view taken on the line of FIG. It is the VI-VI sectional view taken on the line of FIG. It is the VII-VII sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Intake device 2 Engine 10 Intake manifold 11 Surge tank 12 Intake pipe 14 Branch pipe 20 Air cleaner 20A Main housing part 20B Extension housing part 21 Air cleaner case 21a Dusty chamber 22 Bottom wall part 26, 36 Flange part 28 Downstream opening part 29 Filter element 31 Air cleaner cover 31a Clean chamber 31b Extension space portion 31c Resonator chamber 32a Main body portion 32b Extension portion 32c Cosmetic cover portion 37 Tubular wall portion 40 Duct

Claims (6)

An intake system for an engine including an intake manifold and an air cleaner disposed on an upper portion of the intake manifold,
The intake manifold includes a surge tank and a plurality of branch pipes branched from the surge tank and communicated with an intake port on a side surface of the engine body above the surge tank,
The air cleaner is
An air cleaner case that opens upward by a bottom wall part connecting the outer peripheral walls of the plurality of branch pipes in the direction of the engine cylinder row and a side wall part formed integrally with the bottom wall part, and defines a dusty chamber;
An air cleaner cover that closes the opening of the air cleaner case and defines a clean chamber communicating with the dusty chamber via a filter element;
The air cleaner is provided with an extension housing portion that defines an extension space portion extending outward from one end side in the engine cylinder row direction of the clean chamber,
A downstream opening that opens downward is provided on the lower surface of the extension housing portion.
An intake upstream portion communicating with the inside of the surge tank is provided on one end side in the engine cylinder row direction of the surge tank,
An intake system for an engine, wherein a downstream opening of the extension housing portion and an intake upstream portion of the surge tank communicate with each other via a duct below the extension housing portion.   2. The engine intake device according to claim 1, wherein the extension housing portion is formed by extending the air cleaner cover and the air cleaner case in an engine cylinder row direction.   The engine air intake device according to claim 1 or 2, wherein a decorative cover portion is extended on the air cleaner cover so as to cover an upper surface of the engine body.   The engine intake device according to claim 3, wherein a resonator chamber communicating with the clean chamber is formed at a lower portion of the decorative cover portion.   5. The engine intake device according to claim 1, wherein a solenoid valve is disposed on a side of the downstream opening at a lower portion of the extension housing portion.   The engine intake device according to any one of claims 1 to 5, wherein the engine body has a cylinder row direction along a vehicle width direction, and the intake port is disposed on a front side of the vehicle.

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