JP7003508B2 - Air cleaner - Google Patents

Description

The present invention relates to an air cleaner mounted on a vehicle.

It is known that the blow-by gas discharged from the internal combustion engine is returned to the clean chamber of the air cleaner, but the oil in which the oil mist contained in the blow-by gas is aggregated may adhere to the air filter and deteriorate the filtration performance. ..

Conventionally, an air cleaner described in Patent Document 1 is known as one that can prevent oil from adhering to an air filter.

This air cleaner is provided with blow-by gas inlets and air outlets on the first and second side surfaces facing each other of the air cleaner casing, respectively, and the first side surface in the vicinity of the blow-by gas inlet and the vicinity of the air outlet. Is connected to the second side surface by an oil guide member that guides the oil in which the oil mist contained in the blow-by gas is aggregated.

As a result, the oil in which the oil mist contained in the blow-by gas is aggregated can be guided to the air outlet along the oil guide member, and the oil adheres to the element (corresponding to the air filter) to deteriorate the filtration performance. Can be prevented.

Japanese Patent No. 5479560

In such a conventional air cleaner, the outlet of the oil guide member is not formed within the range of the air outlet, so that the outlet of the oil guide member is separated from the air outlet. Therefore, the blow-by gas may not be efficiently guided to the air outlet, and the air filter and the air cleaner may be contaminated.

In addition to this, since the oil guide member connects the first side surface near the blow-by gas inlet and the second side surface near the air outlet, the oil guide member becomes larger and the oil guide member is installed. Space increases.

The present invention has been made by paying attention to the above-mentioned problems, and can prevent the air filter and the air cleaner from being polluted by the blow-by gas while preventing the installation space of the blow-by gas chamber from increasing. It is intended to provide an air cleaner.

In the present invention, an air cleaner case provided with a lower case and an upper case provided above the lower case, and an internal space of the air cleaner case are divided into a dust chamber and a clean chamber located downstream of the dust chamber, and the dust chamber is formed. It has an air filter that purifies the air introduced into the clean chamber, an air inlet pipe portion that is provided in the lower case and introduces air into the dust chamber, and an opening formed in the side wall of the upper case. The air outlet pipe portion for taking out the air introduced into the clean chamber from the clean chamber through the opening, and the blow-by gas inlet pipe portion provided in the lower case for taking in the blow-by gas discharged from the internal combustion engine are provided. An air cleaner is provided with a blow-by gas chamber inside the air cleaner case into which blow-by gas taken in from the blow-by gas inlet pipe portion is introduced, and the blow-by gas chamber receives blow-by gas from the blow-by gas chamber. It has a blow-by gas discharge portion for discharging, and in a plan view of the air cleaner, the blow-by gas discharge portion is provided at a position overlapping the opening, and the air outlet pipe portion is provided from the side wall of the upper case. It is characterized in that it extends diagonally and the width of the opening is formed to be larger than the width of the air outlet pipe portion .

As described above, according to the present invention, it is possible to prevent the installation space of the blow-by gas chamber from increasing, and to prevent the air filter and the air cleaner from being polluted by the blow-by gas.

FIG. 1 is a schematic configuration diagram of an engine provided with an air cleaner according to an embodiment of the present invention. FIG. 2 is a plan view of an engine provided with an air cleaner according to an embodiment of the present invention. FIG. 3 is a left side view of an engine equipped with an air cleaner according to an embodiment of the present invention. FIG. 4 is a rear view of an engine equipped with an air cleaner according to an embodiment of the present invention. FIG. 5 is a cross-sectional view taken along the line VV direction of FIG. FIG. 6 is a cross-sectional view taken along the line in the VI-VI direction of FIG. FIG. 7 is a plan view of the lower case with the upper case removed in the air cleaner according to the embodiment of the present invention.

The air cleaner according to the embodiment of the present invention includes an air cleaner case provided with a lower case and an upper case provided on the upper part of the lower case, and a clean chamber located downstream of the dust chamber and the dust chamber in the internal space of the air cleaner case. It has a partition, an air filter that purifies the air introduced from the dust chamber into the clean chamber, an air inlet pipe portion that is provided in the lower case and introduces air into the dust chamber, and an opening formed in the side wall of the upper case. An air cleaner equipped with an air outlet pipe that takes out the air introduced into the clean chamber from the clean chamber through the opening, and a blow-by gas inlet pipe that is provided in the lower case and takes in the blow-by gas discharged from the internal combustion engine. Therefore, inside the air cleaner case, a blow-by gas chamber into which the blow-by gas taken in from the blow-by gas inlet pipe is introduced is provided, and the blow-by gas chamber has a blow-by gas discharge section for discharging blow-by gas from the blow-by gas chamber. The blow-by gas discharge portion is provided within the range of the opening.

As a result, it is possible to prevent the air filter and the air cleaner from being contaminated by the blow-by gas while preventing the installation space of the blow-by gas chamber from increasing.

Hereinafter, the air cleaner according to an embodiment of the present invention will be described with reference to the drawings.
1 to 7 are views showing an air cleaner according to an embodiment of the present invention. In FIGS. 1 to 7, in the vertical, front-rear, left-right directions, the height direction of the engine is the vertical direction, the cylinder arrangement direction is the front-rear direction, and the direction orthogonal to the cylinder arrangement direction is the left-right direction. The direction is as seen from the driver on board.

First, the configuration will be described.
In FIG. 1, the engine 1 as an internal combustion engine mounted on a vehicle includes a cylinder block 2, a cylinder head 3 provided on the upper part of the cylinder block 2, and a cylinder head cover 4 provided on the upper part of the cylinder head 3. It is provided with an oil pan 5 provided at the bottom of the cylinder block 2.

The cylinder block 2 is provided with a plurality of cylinders 6 arranged side by side in the front-rear direction, and the cylinder 6 is provided with a piston 7 so as to be able to move up and down. The small end of the connecting rod 8 is connected to the piston 7, and the large end of the connecting rod 8 is connected to the crank shaft 9.

As a result, the ascending / descending motion of the piston 7 is converted into the rotational motion of the crank shaft 9 via the connecting rod 8.

A crankcase 2A that rotatably supports the crankshaft 9 is integrally provided at the lower part of the cylinder block 2. A crank chamber 10 is formed between the crankcase 2A and the oil pan 5.

The cylinder head 3 extends along the arrangement direction of the cylinder 6 and extends along the arrangement direction of the intake cam shaft 11 having the intake cam 11a and the intake cam shaft 11 arranged in parallel with the intake cam shaft 11 and extends along the arrangement direction of the cylinder 6 and exhaust cam 12a. The exhaust camshaft 12 and the like are provided.

In the engine 1, the space between the cylinder head 3 in which the intake cam shaft 11 and the exhaust cam shaft 12 are housed and the cylinder head cover 4 constitutes the valve chamber 13.

An intake port 14 and an exhaust port 15 are formed in the cylinder head 3, and the intake port 14 and the exhaust port 15 are driven by the intake valve 16 and the exhaust valve 17 driven by the rotation of the intake cam 11a and the exhaust cam 12a. Each is opened and closed.

An intake manifold 18 is attached to the cylinder head 3, and an air cleaner 41 is connected to the intake manifold 18 via an intake pipe 19. The air cleaner 41 purifies the air taken in from the outside. The air purified by the air cleaner 41 is sucked into the intake manifold 18 from the intake pipe 19.

The air sucked into the intake manifold 18 is distributed to each intake port 14 by the intake manifold 18 and then supplied to each cylinder 6.

A throttle valve 20 is provided in the intake pipe 19, and the throttle valve 20 adjusts the amount of air sucked into the cylinder 6.

The cylinder block 2 is provided with an oil separator chamber 21, and a blow-by gas discharge pipe 23 is connected to the oil separator chamber 21 via a PCV (Positive Crankcase Ventilation) valve 22.

The oil separator chamber 21 communicates with the crank chamber 10 through the blow-by gas passage 24 formed in the cylinder block 2.

The blow-by gas is an unburned air-fuel mixture or combustion gas that leaks into the crank chamber 10 through the gap between the piston 7 and the cylinder 6 during the operation of the engine 1 (shown by G in FIG. 1). A part of the blow-by gas G is introduced into the oil separator chamber 21 through the blow-by gas passage 24.

The blow-by gas introduced into the oil separator chamber 21 is introduced into the intake manifold 18 through the blow-by gas discharge pipe 23 by suction negative pressure after the oil mist contained in the blow-by gas is separated by the oil separator chamber 21. It is burned in the combustion chamber 6A formed in the upper part of the cylinder 6.

The engine 1 of the present embodiment may be provided with a turbocharger (not shown) or an intercooler for cooling the air pressurized by the turbocharger on the downstream side of the intake pipe 19. It may also be composed of a diesel engine. Here, the downstream means the downstream with respect to the direction in which the air flows.

In FIGS. 2 to 4, the air cleaner 41 is attached to the upper part of the cylinder head cover 4.

The air cleaner 41 includes a lower case 42 and an upper case 43, and the lower case 42 and the upper case 43 constitute an air cleaner case 44.

The air cleaner case 44 is provided with an air filter 45 (see FIGS. 5 to 7). In FIG. 5, the air filter 45 is installed between the lower case 42 and the upper case 43. The air filter 45 divides the internal space of the air cleaner case 44 into a dust chamber 46 and a clean chamber 47 downstream of the dust chamber 46, and purifies the air introduced from the dust chamber 46 into the clean chamber 47.

In FIG. 2, an air inlet pipe portion 48 is provided in the lower case 42, and an intake duct 49 is connected to the air inlet pipe portion 48. The intake duct 49 takes in air (outside air), and the air taken in the intake duct 49 is introduced into the dust chamber 46 through the air inlet pipe portion 48.

The upper case 43 is provided with an air outlet pipe portion 50, and the air outlet pipe portion 50 has an opening 50A formed in the side wall 43A of the upper case 43 (see FIGS. 3 and 6).

The air outlet pipe portion 50 takes out the air discharged from the dust chamber 46 to the clean chamber 47 from the clean chamber 47 through the opening 50A.

The downstream end of the air outlet pipe portion 50 is connected to the intake pipe 19, and air is introduced into the intake pipe 19 from the air outlet pipe portion 50.

In FIGS. 1 and 4, the lower case 42 is provided with a blow-by gas inlet pipe portion 51. The cylinder head cover 4 is provided with a blow-by gas discharge pipe portion 52, and the blow-by gas inlet pipe portion 51 is connected to the blow-by gas discharge pipe portion 52 by a grommet pipe 53.

The blow-by gas discharge pipe portion 52 discharges the blow-by gas flowing through the valve chamber 13 to the blow-by gas inlet pipe portion 51. In FIG. 5, a blow-by gas chamber 54 is formed in the air cleaner case 44, and blow-by gas is introduced into the blow-by gas chamber 54 from the blow-by gas discharge pipe portion 52.

In FIGS. 5 and 7, the blow-by gas chamber 54 is provided at a corner of the lower case 42. The blow-by gas chamber 54 is composed of a space surrounded by two side walls 42A and 42B of the lower case 42, a bottom wall 42C of the lower case 42, and a protruding wall 42D protruding upward from the bottom wall 42C of the lower case 42.

A seal member 55 is interposed between the mating surface 42a of the lower case 42 and the mating surface 43a of the upper case 43.

The sealing member 55 extends along the circumferential direction of the lower case 42 (see FIG. 7), and seals the mating surface 42a of the lower case 42 and the mating surface 43a of the upper case 43. This makes it possible to prevent blow-by gas from leaking from the valve chamber 13 to the outside, water, dust, and the like from entering the valve chamber.

The seal member 55 has a ceiling wall portion 55A, and the ceiling wall portion 55A closes the upper part of the blow-by gas chamber 54 to form a blow-by gas chamber 54 together with the side walls 42A and 42B, the bottom wall 42C and the protruding wall 42D.

A blow-by gas discharge hole 55a is formed in the ceiling wall portion 55A, and the blow-by gas introduced into the blow-by gas chamber 54 is discharged from the blow-by gas discharge hole 55a.

The upper case 43 is provided with a bottom plate 43B, and the bottom plate 43B is provided at the bottom of the upper case 43 so as to cover the upper part of the blow-by gas chamber 54.

A blow-by gas discharge hole 43b is formed in the bottom plate 43B, and the blow-by gas discharged from the blow-by gas discharge hole 55a is discharged from the blow-by gas discharge hole 43b to the clean chamber 47. The blow-by gas discharge hole 55a of the present embodiment constitutes the blow-by gas discharge unit of the present invention.

In FIG. 6, the blow-by gas discharge hole 55a is provided within the range of the opening 50A. The range of the opening 50A is a portion where the opening 50A is formed, and the opening 50A is provided so as to overlap the blow-by gas discharge hole 55a in the vertical direction.

In FIG. 6, the air outlet pipe portion 50 extends diagonally from the side wall 43A of the upper case 43, and the width W1 of the opening 50A is formed to be larger than the width W2 of the air outlet pipe portion 50.

In the plan view of the air cleaner 41, the blow-by gas chamber 54 is installed on one side of the axis 50a of the air outlet pipe portion 50, and the air filter 45 is installed on the other side of the axis 50a of the air outlet pipe portion 50. Has been done.

The air filter 45 includes a filter portion 45A for filtering air and a holder portion 45B provided integrally with the filter portion 45A around the filter portion 45A and supported between the lower case 42 and the upper case 43. .. As shown in FIG. 5, the holder portion 45B is supported by the bottom plate 43B and the protruding wall 42D.

In FIG. 5, the ceiling wall portion 55A has a vertical wall 55b. The vertical wall 55b extends from the lower surface of the ceiling wall portion 55A toward the bottom wall 42C along the inner peripheral surface of the side wall 42B of the lower case 42, and has a mating surface 42a of the lower case 42 and a mating surface 43a of the upper case 43. It covers from the inside of the air cleaner case 44.

The lower case 42 is provided with a collision wall 42E, and the collision wall 42E extends upward from the bottom wall 42C toward the ceiling wall portion 55A. When the blow-by gas introduced into the blow-by gas chamber 54 from the blow-by gas inlet pipe portion 51 collides with the collision wall 42E, the oil mist contained in the blow-by gas is separated from the blow-by gas.

In FIG. 7, an oil pit 55c is formed in the ceiling wall portion 55A, and the oil pit 55c communicates the clean chamber 47 and the blow-by gas chamber 54.

In the engine 1 of the present embodiment, the cylinder shaft is tilted with respect to the vertical shaft, and the ceiling wall portion 55A is tilted with respect to the vertical shaft. The oil pit 55c is formed near the side wall 42B of the lower case 42, and the oil dropped on the ceiling wall 55A in the clean chamber 47 moves to the oil pit 55c along the ceiling wall 55A, and then the oil pit 55c. Fall into the blow-by gas chamber 54.

In FIG. 1, a fresh air introduction passage 56 is formed in the engine 1 over a cylinder head cover 4, a cylinder head 3, and a cylinder block 2, and the fresh air introduction passage 56 communicates with a valve operating chamber 13 and a crank chamber 10. There is.

Next, the action will be described.
In FIG. 1, the opening degree of the throttle valve 20 is smaller at low load and medium load of engine 1 than at high load of engine 1. At this time, as shown in the blow-by gas G1, the blow-by gas G of the crankcase 10 passes from the blow-by gas passage 24 to the intake manifold 18 through the oil separator chamber 21, the PCV valve 22 and the blow-by gas discharge pipe 23 due to the negative pressure of the engine 1. be introduced.

The blow-by gas G1 introduced into the intake manifold 18 is introduced into the combustion chamber 6A through the intake port 14 and burned in the combustion chamber 6A.

On the other hand, the air (fresh air) A1 taken into the dust chamber 46 of the air cleaner 41 is purified by the air filter 45 and then introduced into the clean chamber 47 as shown by the air A2. The air A2 introduced into the clean chamber 47 is introduced into the intake pipe 19 from the opening 50A through the air outlet pipe portion 50, and then introduced into the combustion chamber 6A through the intake manifold 18 and the intake port 14.

Further, a part of the air A3 of the air A1 introduced into the clean chamber 47 is introduced into the blow-by gas chamber 54 from the clean chamber 47 through the blow-by gas discharge hole 55a and the blow-by gas discharge hole 43b, and then the blow-by gas inlet pipe portion. It is introduced into the valve chamber 13 through the 51 and the blow-by gas discharge pipe portion 52.

The air A3 introduced into the valve chamber 13 is introduced into the crank chamber 10 through the fresh air introduction passage 56 and scavengs the crank chamber 10.

On the other hand, when the engine 1 has a high load, the opening degree of the throttle valve 20 is larger than when the engine 1 has a low load and a medium load.

At this time, the blow-by gas G in the crank chamber 10 is introduced into the intake manifold 18 from the blow-by gas passage 24 through the oil separator chamber 21 and the blow-by gas discharge pipe 23 by the negative pressure of the engine 1.

However, since the blow-by gas cannot be processed only by the PCV valve 22 when the engine 1 has a high load, the blow-by gas G2 that cannot be processed by the PCV valve 22 is introduced from the crankcase 10 into the valve operating chamber 13 through the fresh air introduction passage 56.

The blow-by gas G2 introduced into the fresh air introduction passage 56 is introduced into the blow-by gas chamber 54 from the valve drive chamber 13 through the blow-by gas discharge pipe portion 52 and the blow-by gas inlet pipe portion 51.

In FIG. 5, the blow-by gas G2 introduced into the blow-by gas chamber 54 collides with the collision wall 42E to separate the oil mist. After the oil mist is separated, the blow-by gas G2 is guided to the blow-by gas discharge hole 55a through the gap between the ceiling wall portion 55A and the collision wall 42E, and then passes through the blow-by gas discharge hole 43b from the blow-by gas discharge hole 55a. It is discharged to the clean chamber 47.

The blow-by gas G2 discharged to the clean chamber 47 is discharged to the air outlet pipe portion 50 from the opening 50A directly above the blow-by gas discharge hole 55a (see FIG. 6).

The blow-by gas discharged to the air outlet pipe portion 50 is introduced into the intake pipe 19, then introduced into the combustion chamber 6A through the intake manifold 18 and the intake port 14, and is burned in the combustion chamber 6A.

The oil mist separated by gas and liquid in the blow-by gas chamber 54 is returned to the valve chamber 13 from the blow-by gas inlet pipe portion 51 through the blow-by gas discharge pipe portion 52. When oil mist is accumulated in the ceiling wall portion 55A, the oil mist is guided to the oil pit 55c along the upper surface of the ceiling wall portion 55A and falls from the oil pit 55c into the blow-by gas chamber 54.

According to the air cleaner 41 of the present embodiment, the air outlet pipe portion having an opening 50A formed in the side wall 43A of the upper case 43 and taking out the air discharged to the clean chamber 47 from the clean chamber 47 through the opening 50A. Has 50.

Inside the air cleaner case 44, a blow-by gas chamber 54 into which the blow-by gas taken in from the blow-by gas inlet pipe portion 51 is introduced is provided.

The blow-by gas chamber 54 has a blow-by gas discharge hole 55a for discharging blow-by gas from the blow-by gas chamber 54, and the blow-by gas discharge hole 55a is provided within the range of the opening 50A.

As a result, the blow-by gas discharged from the blow-by gas chamber 54 from the blow-by gas discharge hole 55a through the blow-by gas discharge hole 43b to the clean chamber 47 is discharged from the blow-by gas discharge hole 43b to the air outlet pipe portion through the opening 50A at the moment when the blow-by gas is discharged from the blow-by gas discharge hole 43b. It can be reliably sucked to 50. Therefore, it is possible to easily prevent the air filter 45 from being contaminated by blow-by gas.

Further, since the blow-by gas can be processed by forming the blow-by gas chamber 54 communicating the blow-by gas inlet pipe portion 51 and the blow-by gas discharge hole 55a in the air cleaner case 44, the blow-by gas chamber 54 is installed in the air cleaner case 44. It is possible to prevent the space from increasing.

Further, according to the air cleaner 41 of the present embodiment, the air outlet pipe portion 50 extends diagonally from the side wall 43A of the upper case 43, and the width W1 of the opening 50A is larger than the width W2 of the air outlet pipe portion 50. It is formed.

As a result, even when the width W1 of the opening 50A is increased and the blow-by gas discharge hole 55a is formed within the range of the opening 50A, the air flow is obstructed by the blow-by gas discharged from the blow-by gas discharge hole 55a. Can be prevented.

Therefore, as shown in FIG. 6, the blow-by gas G2 can be easily merged with the air A2 to improve the blow-by gas processing performance.

Further, since the opening 50A can be formed large, the opening area of the blow-by gas discharge hole 55a can be increased, more blow-by gas can be discharged from the blow-by gas discharge hole 55a, and the blow-by gas can be treated per unit time. You can improve your ability.

Further, according to the air cleaner 41 of the present embodiment, in the plan view of the air cleaner 41, a blow-by gas chamber 54 is installed on one side of the axis 50a of the air outlet pipe portion 50, and the blow-by gas chamber 54 is installed on the axis 50a of the air outlet pipe portion 50. On the other hand, the air filter 45 is installed on the other side.

As a result, as shown in FIG. 6, even if the blow-by gas G2 discharged from the blow-by gas discharge hole 55a tries to flow to the air filter 45 side, it can be blocked by the air A2 flowing from the clean chamber 47 to the air outlet pipe portion 50. can. Therefore, it is possible to prevent the blow-by gas G2 from flowing to the air filter 45 side.

Further, the blow-by gas G2 can be smoothly guided to the air outlet pipe 50 by the air A2 flowing from the clean chamber 47 to the air outlet pipe 50. Therefore, the processing capacity of blow-by gas can be improved.

Further, according to the air cleaner 41 of the present embodiment, since the blow-by gas chamber 54 is provided at the corner of the lower case 42, the blow-by gas chamber 54 is provided in the air cleaner case 44 by using the side walls 42A and 42B of the lower case 42. Can be formed.

Therefore, the installation space of the blow-by gas chamber 54 with respect to the air cleaner case 44 can be reduced, and as a result, the size of the air cleaner 41 can be prevented from becoming large.

Further, according to the air cleaner 41 of the present embodiment, the sealing member 55 is interposed between the mating surface 42a of the lower case 42 and the mating surface 43a of the upper case 43.

Further, the seal member 55 has a ceiling wall portion 55A that closes the upper part of the blow-by gas chamber 54 to form the blow-by gas chamber 54, and the blow-by gas discharge hole 55a is formed in the ceiling wall portion 55A.

Thereby, a part of the blow-by gas chamber 54 can be configured by using the seal member 55, and the configuration of the blow-by gas chamber 54 can be simplified.

Further, according to the air cleaner 41 of the present embodiment, the ceiling wall portion 55A has a vertical wall 55b, and the vertical wall 55b is downward from the lower surface of the ceiling wall portion 55A along the inner peripheral surface of the side wall 42B of the lower case 42. And covers the mating surface 42a of the lower case 42 and the mating surface 43a of the upper case 43 from the inside of the air cleaner case 44.

As a result, the blow-by gas introduced into the blow-by gas chamber 54 is blocked by the vertical wall 55b, so that the blow-by gas leaks to the outside from between the mating surface 42a of the lower case 42 and the mating surface 43a of the upper case 43. It can be effectively prevented.

In addition to this, the vertical wall 55b makes it possible to rectify the blow-by gas flowing through the blow-by gas chamber 54.

Further, according to the air cleaner 41 of the present embodiment, the oil drop hole 55c is formed in the ceiling wall portion 55A, and the oil on the upper surface of the ceiling wall portion 55A can fall from the oil drop hole 55c into the blow-by gas chamber 54.

As a result, the oil dropped on the upper surface of the ceiling wall portion 55A in the clean chamber 47 can be returned to the blow-by gas chamber 54 from the oil pit 55c. Therefore, it is possible to more effectively prevent the air filter 45 from being contaminated by oil. Further, it is possible to prevent the oil from leaking to the outside of the air cleaner 41 and prevent the air cleaner 41 from being soiled.

The air cleaner 41 of this embodiment is provided with a bottom plate 43B having a blow-by gas discharge hole 43b in the upper case 43, but the bottom plate 43B may be abolished. That is, the blow-by gas may be discharged directly from the blow-by gas discharge hole 55a into the clean chamber 47.

Although embodiments of the present invention have been disclosed, it will be apparent to those skilled in the art that modifications may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

1 ... engine (internal combustion engine), 23 blow-by gas exhaust pipe, 41 ... air cleaner, 42 ... lower case, 42A ... side wall, 42a ... mating surface (matching surface of lower case), 43 .. .Upper case, 43a ... mating surface (matching surface of upper case), 44 ... air cleaner case, 45 ... air filter, 46 ... dust chamber, 47 ... clean chamber, 48 ... Air inlet pipe, 50 ... air outlet pipe, 50A ... opening, 50a ... axis (axis of air outlet pipe), 51 ... blow-by gas inlet pipe, 54 ... blow-by Gas chamber, 55 ... Seal member, 55A ... Ceiling wall part, 55a ... Blow-by gas discharge hole (blow-by gas discharge part), 55b ... Vertical wall, 55c ... Oil drop hole

Claims (6)

An air cleaner case provided with a lower case and an upper case provided on the upper part of the lower case, and an air cleaner case.
An air filter that divides the internal space of the air cleaner case into a dust chamber and a clean chamber located downstream of the dust chamber, and purifies the air introduced from the dust chamber into the clean chamber.
An air inlet pipe portion provided in the lower case and introducing air into the dust chamber,
An air outlet pipe portion having an opening formed in the side wall of the upper case and taking out the air introduced into the clean chamber from the clean chamber through the opening.
An air cleaner provided in the lower case and provided with a blow-by gas inlet pipe portion for taking in blow-by gas discharged from an internal combustion engine.
Inside the air cleaner case, a blow-by gas chamber into which the blow-by gas taken in from the blow-by gas inlet pipe portion is introduced is provided.
The blow-by gas chamber has a blow-by gas discharge unit that discharges blow-by gas from the blow-by gas chamber.
In the plan view of the air cleaner, the blow-by gas discharge portion is provided at a position overlapping the opening .
The air cleaner is characterized in that the air outlet pipe portion extends obliquely from the side wall of the upper case, and the width of the opening is formed to be larger than the width of the air outlet pipe portion . An air cleaner case provided with a lower case and an upper case provided on the upper part of the lower case, and an air cleaner case.
An air filter that divides the internal space of the air cleaner case into a dust chamber and a clean chamber located downstream of the dust chamber, and purifies the air introduced from the dust chamber into the clean chamber.
An air inlet pipe portion provided in the lower case and introducing air into the dust chamber,
An air outlet pipe portion having an opening formed in the side wall of the upper case and taking out the air introduced into the clean chamber from the clean chamber through the opening.
An air cleaner provided in the lower case and provided with a blow-by gas inlet pipe portion for taking in blow-by gas discharged from an internal combustion engine.
Inside the air cleaner case, a blow-by gas chamber into which the blow-by gas taken in from the blow-by gas inlet pipe portion is introduced is provided.
The blow-by gas chamber has a blow-by gas discharge unit that discharges blow-by gas from the blow-by gas chamber.
In the plan view of the air cleaner, the blow-by gas discharge portion is provided at a position overlapping the opening.
In a plan view of the air cleaner, the blow-by gas chamber is installed on one side with respect to the axis of the air outlet pipe, and the air filter is installed on the other side with respect to the axis of the air outlet pipe . An air cleaner featuring. An air cleaner case provided with a lower case and an upper case provided on the upper part of the lower case, and an air cleaner case.
An air filter that divides the internal space of the air cleaner case into a dust chamber and a clean chamber located downstream of the dust chamber, and purifies the air introduced from the dust chamber into the clean chamber.
An air inlet pipe portion provided in the lower case and introducing air into the dust chamber,
An air outlet pipe portion having an opening formed in the side wall of the upper case and taking out the air introduced into the clean chamber from the clean chamber through the opening.
An air cleaner provided in the lower case and provided with a blow-by gas inlet pipe portion for taking in blow-by gas discharged from an internal combustion engine.
Inside the air cleaner case, a blow-by gas chamber into which the blow-by gas taken in from the blow-by gas inlet pipe portion is introduced is provided.
The blow-by gas chamber has a blow-by gas discharge unit that discharges blow-by gas from the blow-by gas chamber.
In the plan view of the air cleaner, the blow-by gas discharge portion is provided at a position overlapping the opening.
The blow-by gas chamber is an air cleaner provided at a corner of the lower case . A sealing member is interposed between the mating surface of the lower case and the mating surface of the upper case.
The seal member has a ceiling wall portion that closes the upper part of the blow-by gas chamber to form the blow-by gas chamber.
The air cleaner according to any one of claims 1 to 3 , wherein the blow-by gas discharge portion is formed on the ceiling wall portion . The ceiling wall portion has a vertical wall, and the vertical wall extends downward from the lower surface of the ceiling wall portion and covers the mating surface of the lower case and the mating surface of the upper case from the inside of the air cleaner case. The air cleaner according to claim 4, wherein the air cleaner is provided. According to claim 4 or 5 , an oil drop hole is formed in the ceiling wall portion, and oil on the upper surface of the ceiling wall portion can fall from the oil drop hole into the blow-by gas chamber . The listed air cleaner.

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