JP3938564B2 - Air cleaner device for internal combustion engine - Google Patents

Description

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

An air cleaner device in which a duct protrudes into an air cleaner case to secure an intake pipe length has already been disclosed (see, for example, Patent Document 1).
JP-A-8-183352

  As described in Patent Document 1, the length of the intake connecting pipe connected to the throttle body by projecting a duct into the air cleaner case is substantially extended with this duct, and the required torque characteristics are made use of intake inertia and intake pulsation. Is maintained to prevent the output from decreasing.

However, since the intake pipe length is substantially extended, the operation sound of a device such as a bypass valve on the downstream side of the air cleaner may resonate during idling.
The present invention has been made in view of the above points, and its object is to provide an air cleaner device for an internal combustion engine that can prevent resonance of sound while maintaining necessary torque characteristics.

In order to achieve the above object, according to the first aspect of the present invention, an air cleaner element having an air cleaner element main body for purifying intake air is disposed between an upper air cleaner case and a lower air cleaner case which are divided vertically. An air cleaner device provided, wherein a duct connected to the upper air cleaner case and communicating with an intake connecting pipe constituting a downstream intake passage of the air cleaner device on the upstream side is formed to protrude into the air cleaner case, and the lower surface of the duct In the air cleaner device in which a communication port for communicating the inside and outside of the duct is formed in a part of the air duct, fresh air communicating with the inside of the cylinder head cover or the crank case of the internal combustion engine is provided in the vicinity of the connection portion of the intake connecting pipe with the air cleaner case. An inlet pipe is connected and a portion upstream of the opening of the fresh air inlet pipe of the intake connecting pipe The direction of the air cleaner device is inclined downwardly, the communication opening was air cleaner system for an internal combustion engine which is arranged to avoid directly above the air cleaner element body.

The duct is formed in the upper air cleaner case to ensure the required length of the torque by using the intake inertia and intake pulsation to maintain the required torque characteristics. Sound can be reduced.
Since the communication port which connects the inside and outside of the duct is formed on the lower surface of the duct, it can be used as a drain port.

According to a second aspect of the present invention, in the air cleaner device for an internal combustion engine according to the first aspect, the duct is attached to the upper air cleaner case by an attachment portion provided on the duct, and the communication port is provided with the attachment portion of the duct. It is characterized in that it is formed at an avoiding position.

Since the duct is separate from the upper air cleaner case and is attached to the inside of the upper air cleaner case by the mounting portion of the duct, the upper air cleaner case can be easily molded.
Further, since the communication port of the duct is formed at a position avoiding the mounting portion, the mounting rigidity is not lowered.

  According to a third aspect of the present invention, in the air cleaner device for an internal combustion engine according to the second aspect, the communication port is formed by a notch at the downstream end.

  Since the communication port is formed by the notch at the downstream end, the duct can be easily formed.

According to a fourth aspect of the present invention, in the air cleaner device for an internal combustion engine according to the first aspect, the communication port is between the downstream end opening end of the duct and the opening end connected to the intake connection pipe of the upper air cleaner case. It is formed as a gap.

  The necessary torque characteristics can be maintained, resonance can be prevented, the duct shape can be simplified and rigidity can be easily secured, and mounting is also easy without requiring accuracy.

According to a fifth aspect of the present invention, in the air cleaner device for an internal combustion engine according to the fourth aspect, the opening diameter of the opening end connected to the intake connecting pipe of the upper air cleaner case is larger than the inner diameter of the downstream end opening end of the duct. It is characterized by.

  The displacement between the opening connected to the intake pipe and the central axis of the duct can be absorbed, and high mounting accuracy is not required.

An embodiment according to the present invention will be described below with reference to FIGS.
FIG. 1 shows a portion of an intake system in an internal combustion engine mounted on a four-wheeled vehicle to which an air cleaner device 10 according to the present embodiment is applied.

  The internal combustion engine is a four-stroke cycle internal combustion engine. A throttle body 3 is connected to an intake manifold 2 in which an intake pipe extending from an intake port of a cylinder head of the internal combustion engine is gathered. An extending intake connecting pipe 4 is connected to the air cleaner device 10.

  The air cleaner device 10 includes an upper air cleaner case 11 and a lower air cleaner case 12 which are divided into upper and lower parts, and an air cleaner element 13 sandwiched therebetween, and an intake connecting pipe 4 is connected to the upper air cleaner case 11 to form a case. It communicates with the clean side.

A communication pipe 5 connected to the lower air cleaner case 12 and communicating with the dust side in the case extends to the front of the vehicle body (in the direction of arrow F in FIG. 1) and reaches an air intake 6 that opens forward.
A branch pipe 5 a branched from the middle of the communication pipe 5 is connected to the resonator 7.
An internal combustion engine is located below the resonator 7 that is largely flattened.

The air intake system is configured as described above, and the air taken in from the air intake port 6 is sucked into the dust side of the air cleaner device 10 through the communication pipe 5 and purified by the air cleaner element 13 to be air cleaner device 10. From the clean side, the fuel passes through the intake connecting pipe 4, passes through the throttle body 3, mixes the fuel from the fuel injection valve through the intake pipe 2, and reaches the combustion chamber of the internal combustion engine.
Intake sound due to air passing through the communication pipe 5 is absorbed by the resonator 7 and reduced.

  As described above with reference to FIG. 2, the air cleaner device 10 is formed by combining the upper air cleaner case 11 and the lower air cleaner case 12 with the air cleaner element 13 interposed therebetween.

  The upper air cleaner case 11 has a substantially rectangular box shape, and as shown in FIG. 3, a rectangular frame-shaped opening end surface opened downward serves as a mating surface 11a, and bolt holes are formed in mounting boss portions 11b bulging at approximately four corners. 11c is drilled.

A joining tube 11d is formed to protrude obliquely from one corner of the rectangular box-shaped side wall, and the joining tube 11d communicates with the inside of the case.
A pair of support pieces 11e, 11e are projected in parallel to each other on both sides of the inwardly extending portion of the joint pipe 11d, and long grooves 11f, 11f are formed on end surfaces of the support pieces 11e, 11e.

  Inside the upper air cleaner case 11, ribs 11g are formed in a lattice shape at portions excluding the periphery of the pair of support pieces 11e, 11e.

On the other hand, the lower air cleaner case 12 is composed of a case main body portion 12a having a substantially rectangular box shape and a connecting portion 12b bulging rearwardly. As shown in FIG. 4, a rectangular frame opened above the case main body portion 12a. The upper opening end surface is a mating surface 12c, and a nut 12e is fixed to a mounting boss portion 12d bulging at substantially four corners.
A joining tube 12f is formed to protrude from the connecting portion 12b.

Air cleaner element 13, as shown in FIG. 5 is a flat rectangular shape, the element body 13a is not folded in a bellows flange 13b is extended therearound.
The outer peripheral edge portion of the flange 13b is a seal support portion 13c supported via a seal member 17, and this rectangular annular seal support portion 13c is formed by the mating surfaces 11a of the upper air cleaner case 11 and the lower air cleaner case 12. It corresponds to 12c.

1 corner of the element body 13a is formed larger wide flange portion 13d of the area is deficient obliquely directed obliquely to the edge of the element body 13a deficient obliquely in the wide flange portion 13d Thus, a liquid reservoir recess 14 which is a long groove is formed at a predetermined position.

  Such an air cleaner element 13 is united so that the upper air cleaner case 11 and the lower air cleaner case 12 are sandwiched between them as shown in FIG.

  At that time, the seal member 17 is fitted to the seal support portion 13c on the outer peripheral edge of the air cleaner element 13, and the sealing member 17 is sandwiched between the mating surfaces 11a and 12c of the upper air cleaner case 11 and the lower air cleaner case 12. The interior is defined as a lower dust side and an upper clean side (see FIG. 10).

  The four mounting boss portions 11b of the upper air cleaner case 11 and the four mounting boss portions 12d of the lower air cleaner case 12 are in contact with each other, and the bolts 18 are passed through the bolt holes 11c of the mounting boss portion 11b. The upper air cleaner case 11 and the lower air cleaner case 12 are united by screwing into the nut 12e of the boss portion 12d.

Inside the upper air cleaner case 11, an air funnel 15 which is a duct extending in the extending direction of the joining pipe 11d is attached.
Referring to FIGS. 6 to 8, the air funnel 15 has a funnel-shaped funnel body 15a in which one upstream opening of a cylinder having the same diameter as that of the joining pipe 11d is gradually increased in diameter. Mounting pieces 15b and 15b protrude from the outer surface of the funnel body 15a to the left and right.

The left and right mounting pieces 15b and 15b are long in the direction of the central axis C of the air funnel 15, and protrusions 15c and 15c are formed on the top surfaces of the mounting pieces 15b and 15b in the long direction.
The air funnel 15 has a communication port 16 formed by notching the lower side of the downstream opening of the funnel body 15a.

The air funnel 15 as described above is attached by supporting the pair of left and right attachment pieces 15b, 15b on the pair of support pieces 11e, 11e inside the upper air cleaner case 11.
The protrusions 15c and 15c of the attachment pieces 15b and 15b are fitted into the long grooves 11f and 11f of the support pieces 11e and 11e, and are ultrasonically welded to attach the air funnel 15 to the inside of the upper air cleaner case 11 as shown in FIG. It is done.

  The air funnel 15 attached to the pair of support pieces 11e, 11e of the upper air cleaner case 11 has a downstream opening end face with the central axis C of the funnel body 15a aligned with the central axis of the joining pipe 11d having substantially the same diameter. Is in contact with the opening end surface of the joint tube 11d in the case, and the joint tube 11d is extended into the case.

  However, a communication port 16 opened downward is located at the contact portion between the joining pipe 11d and the funnel main body 15a, which communicates the inside and outside of the funnel main body 15a.

  The air funnel 15 is separate from the upper air cleaner case 11 and is attached to the inside of the upper air cleaner case 11 by the mounting pieces 15b, 15b of the air funnel 15, so that the upper air cleaner case 11 can be easily molded.

The formation of the air funnel 15 is facilitated by the communication port 16 being formed by a notch.
Further, since the communication port 16 of the air funnel 15 is formed at a position avoiding the mounting pieces 15b and 15b, the mounting rigidity is not lowered.

  When the upper air cleaner case 11 having such an air funnel 15 attached therein is combined with the lower air cleaner case 12 with the air cleaner element 13 therebetween, as described above, the communication opening opened below the air funnel 15 A liquid reservoir recess 14 formed in the air cleaner element 13 is positioned substantially directly below 16 (see FIG. 10).

  In the air cleaner apparatus 10 having the above-described configuration, the intake coupling pipe 4 is connected to the joining pipe 11d of the upper air cleaner case 11, the communication pipe 5 is connected to the joining pipe 12f of the lower air cleaner case 12, and is supported by the vehicle body. However, as shown in FIG. 10, the air cleaner element 13 is supported in a tilted posture with the rear side somewhat lowered.

  Accordingly, the liquid reservoir recess 14 on the front side of the air cleaner element 13 is at a high position, and the joining pipe 11d and the air funnel 15 parallel to the air cleaner element 13 are also slightly inclined.

  A fresh air introduction pipe 20 communicating with the inside of the cylinder head cover or the crankcase of the internal combustion engine is connected in the vicinity of the connection portion of the intake coupling pipe 4 with the joining pipe 11d, and the air cleaner is connected via the fresh air introduction pipe 20. Fresh air is introduced into the crankcase of the internal combustion engine from the clean side of the device 10.

  Although not shown in the figure, a blow-by gas return passage communicates between the breather chamber in the cylinder head cover or the crankcase and the downstream side of the throttle body 3, and a PCV system is configured to return the blow-by gas to the combustion chamber for combustion. Yes.

  In the air cleaner device 10, the air funnel 15 is formed so as to protrude into the upper air cleaner case 11, thereby extending the length of the intake connecting pipe 4 to secure the pipe length using the intake pulsation and maintaining the necessary torque characteristics. I am doing so.

  By forming a communication port 16 in a part of the air funnel 15, the air funnel 15 and the upper air cleaner case 11 are communicated with each other so that the upper air cleaner case 11 acts as a resonator, and the bypass valve in the throttle body 3 is operated. Resonance can be prevented by suppressing air vibration such as operating noise by resonance.

  A fresh air introduction pipe 20 is connected to the intake connecting pipe 4 so as to introduce fresh air from the air cleaner device 10 into the cylinder head cover of the internal combustion engine. The blow-by gas flows back through the fresh air introduction pipe 20 and is discharged from the opening 20 a of the fresh air introduction pipe 20 to the intake connecting pipe 4.

  At that time, the water-separated water of the blow-by gas flows down along the inner surface of the intake connecting pipe 4 from the opening 20a of the fresh air introduction pipe 20 as shown by the broken line arrow in FIG. The air cleaner case 11 enters the upper air cleaner case 11, but can be drained by dripping downward from the communication port 16 opened in the downward direction by a cutout of the air funnel 15.

Since the liquid reservoir recess 14 of the air cleaner element 13 is positioned almost directly below the communication port 16, the water dripped downward accumulates in the liquid reservoir recess 14.
The water accumulated in the liquid reservoir recess 14 is treated by evaporation.

Therefore it is possible to prevent the consuming water problems will be caused in the element body 13a of the air cleaner element 13.

  Further, the upstream portion of the intake air connection pipe 4 from the opening 20a of the fresh air introduction pipe 20 and the joint pipe 11d are inclined downward in the direction of the air cleaner device 10, so that the intake connection pipe 4 is connected to the intake air connection pipe 4 from the opening 20a of the fresh air introduction pipe 20. The water flowing down along the inner surface flows toward the air cleaner device 10 and does not flow toward the throttle body 3 side.

  Therefore, there is no problem that water enters the throttle body 3 and freezes in a low-temperature environment to hinder the operation of the valve.

  Since the air cleaner element 13 is also inclined and the seal member 17 in the vicinity of the liquid reservoir recess 14 is positioned above the liquid reservoir recess 14, water dripping downward from the communication port 16 of the air funnel 15 is sealed member 17. Therefore, it is possible to prevent the seal member 17 from causing a seal failure due to water entering the seal portion sandwiched between the upper air cleaner case 11 and the lower air cleaner case 12 and expanding due to freezing. .

The larger the volume of the liquid reservoir recess 14, the better it will not overflow, but by forming it along the seal support portion 13 c of the air cleaner element 13, the space of the flange 13 b can be effectively used to increase the volume of the recess. Can do.
Further, it is easy to hold the air cleaner element 13 by using the liquid reservoir recess 14 during maintenance.

The flange portion having the largest width between the element main body portion 13a and the seal support portion 13c is the portion having the lowest rigidity, and since the liquid reservoir recess 14 is provided in the same portion, the rigidity of the flange portion is increased. be able to.
In addition, the rigidity of the said flange part can be improved by providing a liquid pool recessed part in flange parts other than the part where the width | variety between the element main-body part 13a and the seal support part 13c is the minimum.

  In the air funnel 15 in the present embodiment, the notch in the downstream opening of the funnel body 15a is used as the connection port 16, but an example in which the connection port is formed in another configuration is shown in FIG.

That is, the present air funnel 30 has no notch in the downstream opening of the funnel-shaped funnel body 30a provided with mounting pieces on the left and right sides, and the downstream opening end face is from the opening end face in the case of the joining pipe 11d of the upper air cleaner case 11. It is located so as to form a connection port 31 with a gap between them.
Note that members other than the air funnel 30 are the same as those in the above embodiment, and the same reference numerals are used.

  Even with such a configuration, the pipe length of the intake connecting pipe 4 is substantially extended by the air funnel 30 to the inside of the air cleaner case to secure the pipe length using the intake inertia and the intake pulsation, and necessary torque characteristics are maintained. By connecting the inside of the air funnel 30 and the inside of the air cleaner case through the connection port 31 at the opening end of the air funnel 30, the inside of the case can act as a resonator to suppress resonance of air vibrations such as device operating noise by resonance to prevent resonance. it can.

Then, the shape of the air funnel 30 is simplified and it is easy to ensure rigidity.
Further, since the air funnel 30 is attached away from the opening end face in the case of the joining pipe 11d of the upper air cleaner case 11, the attachment is easy without requiring accuracy.

  Further, the connection port 31 at the open end of the air funnel 30 is also used as a drain port as in the above embodiment.

  The opening diameter of the opening end in the case of the joining pipe 11d in the upper air cleaner case 11 is made larger than the inner diameter of the opening end of the downstream end of the air funnel 30, so that the opening of the joining pipe 11d connected to the intake connecting pipe 4 and the air funnel 30 It is possible to absorb the deviation of the center axis of the, and high installation accuracy is not required.

It is a perspective view of the part of the intake system of an internal combustion engine. It is a disassembled side view of an air cleaner apparatus. It is a bottom view of an upper air cleaner case. It is a top view of a lower air cleaner case. It is a top view of an air cleaner element. It is a top view of an air funnel. It is the same side view. It is the same front view. It is a bottom view of an upper air cleaner case to which an air funnel is attached. It is principal part sectional drawing of an air cleaner apparatus. It is principal part sectional drawing of the air cleaner apparatus which concerns on another embodiment.

Explanation of symbols

2 ... intake manifold, 3 ... throttle body, 4 ... intake connection pipe, 5 ... communication pipe, 6 ... air intake, 7 ... resonator,
10 ... Air cleaner device, 11 ... Upper air cleaner case, 12 ... Lower air cleaner case, 13 ... Air cleaner element, 14 ... Puddle reservoir, 15 ... Air funnel, 16 ... Communication port, 17 ... Seal member, 18 ... Bolt, 20 ... Fresh air introduction pipe,
30 ... Air funnel, 31 ... Communication port.

Claims (5)

An air cleaner device in which an air cleaner element provided with an air cleaner element main body for purifying intake air is disposed between an upper air cleaner case and a lower air cleaner case which are divided vertically.
A duct connected to the upper air cleaner case and communicating with an intake connecting pipe constituting a downstream intake passage of the air cleaner device on the upstream side is formed to protrude in the air cleaner case, and a part of the lower surface of the duct is connected to the inside and outside of the duct. In an air cleaner device in which a communication port for communication is formed,
A fresh air introduction pipe communicating with the inside of the cylinder head cover of the internal combustion engine or the inside of the crankcase is connected to the vicinity of the connection portion of the intake coupling pipe with the air cleaner case,
An upstream portion of the intake connecting pipe from the opening of the fresh air introduction pipe is inclined downward in the direction of the air cleaner device,
An air cleaner device for an internal combustion engine, wherein the communication port is disposed so as to avoid a position directly above the air cleaner element main body.   2. The internal combustion engine according to claim 1, wherein the duct is attached to the upper air cleaner case by an attachment portion provided in the duct, and the communication port is formed at a position avoiding the attachment portion of the duct. Air cleaner device.   The air cleaner device for an internal combustion engine according to claim 2, wherein the communication port is formed by a notch at a downstream end.   2. The air cleaner apparatus for an internal combustion engine according to claim 1, wherein the communication port is formed as a gap between a downstream end opening end of the duct and an opening end connected to the intake connection pipe of the upper air cleaner case. .   5. An air cleaner device for an internal combustion engine according to claim 4, wherein an opening diameter of the upper end of the upper air cleaner case connected to the intake connecting pipe is larger than an inner diameter of the opening end of the downstream end of the duct.

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