JP2003013816A - Intake pre-cleaner structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake pre-cleaner structure capable of certainly discharging outside water mist and dust collected by an outer pipe. SOLUTION: This intake pre-cleaner structure 1 comprises a pre-cleaner body including a turning flow forming means 7 for converting introduced air A to turning flow, the outer pipe 4 having the turning flow forming means 7 on the upstream side in the air flow direction, and an inner pipe 8 that has one end coaxially communicating with the downstream side of the outer pipe 4 in the air flow direction, the other end communicating with an intake duct 2, and a diameter smaller than that of the outer pipe 4, and a casing 3 that stores the outer pipe 4 of the pre-cleaner body and has a discharge part 9a downwardly. An axially extending slit 10 is disposed near the lower end of the outer pipe 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake precleaner structure for an internal combustion engine that removes water mist, dust and the like contained in the air supplied to an air cleaner.

[0002]

2. Description of the Related Art An air cleaner is used to supply clean air from an intake duct to a combustion chamber of an internal combustion engine. Before supplying air to the air cleaner, a water mist or a relatively large amount is preliminarily provided by an intake precleaner. It is common practice to remove dust.

An example of the intake precleaner is shown in FIG.
There is one shown in. Intake precleaner 1 shown in FIG.
Is disposed on the right side of the rear surface of the cab of the vehicle and is attached to the tip of an intake duct 2 that sucks in combustion air to remove water mist and dust. That is, the casing 3 is provided at the upper end of the intake duct 2 so as to project from the intake duct 2 in the horizontal direction. The casing 3 has both ends open and one end protruding outside the casing 3 and the other end. A cylindrical outer pipe 4 positioned so as to be positioned inside the casing 3 is attached so as to be oriented in the horizontal direction. Also, the other end of the outer pipe 4 located inside the casing 3 and the wall surface 2 of the intake duct 2 facing the outer pipe 4
A gap G is formed between a and a.

At one end of the outer pipe 4, which is an air inlet port protruding outside the casing 3, a cylindrical guide member 5 having a hemispherical portion facing the outside is concentrically arranged with respect to the outer pipe 4. The guide member 5 outer circumference and the outer pipe 4 inner circumference are connected by a plurality of blades 6 arranged at a predetermined pitch in the circumferential direction to form a swirling flow forming means 7. The swirl flow forming means 7 is for generating a swirl flow in the air A introduced into the outer pipe 4 through the space between the blades 6. For example, the blade 6 has an arc portion and two straight line portions having different lengths. It is made of and has a twisted fan shape.

On the wall surface 2a of the intake duct 2 facing the outer pipe 4, there is provided a cylindrical inner pipe 8 which penetrates the wall surface 2a and has one end located inside the outer pipe 4 and the other end located inside the intake duct 2. , Are attached concentrically to the outer pipe 4 with both ends open. The outer diameter of the inner pipe 8 is smaller than the inner diameter of the outer pipe 4. This is done by allowing the air A flowing through the center of the swirl flow to flow into the inner pipe 8 and by the centrifugal force generated by the swirl flow to the outer side. This is because the water mist and dust that have been blown into the air collide with the inner peripheral wall surface of the outer pipe 4 and are easily removed from the air.

Thus, the swirl flow forming means 7, the outer pipe 4, and the inner pipe 8 form a precleaner body (not shown).

An unload pipe 9 having a discharge portion 9a at its lower end for discharging water mist and dust is attached to the lower end portion of the casing 3 on the side away from the wall surface 2a side of the intake duct 2. .

In such a precleaner, the swirl flow forming means 7 is generated by the negative pressure of the internal combustion engine when the internal combustion engine is driven.
The air A sucked into the air becomes a swirl flow by passing through the blades 6 attached to the air inlet, and water mist and dust in the air are blown in the circumferential direction by the centrifugal force of the swirl flow, and the inside of the outer pipe 4 It collides with the surrounding wall surface and is collected. For this reason, the water mist and dust aggregate and flow down along the inner peripheral wall surface of the outer pipe 4, and the outer pipe 4 and the intake duct 2
Is discharged into the casing 3 through a gap G formed between the wall surface 2a of In the figure, W is a water droplet formed by aggregation of water mist.

The air A, from which water mist and dust have been removed, flows from the outer pipe 4 through the inner pipe 8 into the intake duct 2, reverses and moves downward, and is introduced into the internal combustion engine via the air cleaner.

[0010]

However, in the intake precleaner 1 described above, the casing 3 is removed from the gap G.
Since the water mist and dust discharged inside are replaced with the air A that has flowed into the casing 3 from the discharge portion 9a at the lower end of the unload pipe 9 due to the negative pressure of the internal combustion engine, the water mist and dust are replaced. May not be sufficiently discharged, and water mist or dust may flow into the internal combustion engine along with the air A flowing into the casing 3 from the discharge portion 9a at the lower end of the unload pipe 9.

In view of the above situation, it is an object of the present invention to provide an intake precleaner structure capable of reliably discharging the water mist and dust collected by the outer pipe to the outside. .

[0012]

In the intake precleaner structure according to claim 1 of the present invention, a swirl flow forming means for making the introduced air a swirl flow, and the swirl flow forming means are arranged on the upstream side in the air flow direction. The first cylindrical body is provided with a smaller diameter than the first cylindrical body having one end coaxially communicating with the downstream side of the first cylindrical body in the air flow direction and the other end communicating with the intake duct. An intake precleaner structure comprising a precleaner main body composed of a second tubular body, and a casing accommodating the first tubular body of the precleaner main body and having a discharge portion provided below the first tubular body An opening extending in the axial direction is provided near the lower end of the body.

The intake precleaner structure according to claim 2 of the present invention is the intake precleaner structure according to claim 1, wherein:
The opening is arranged closer to the turning direction at the lower end of the first tubular body with respect to a perpendicular line passing through the axis of the first tubular body.

The intake precleaner structure according to claim 3 of the present invention is the intake precleaner structure according to claim 1 or 2, wherein a plurality of precleaner bodies are arranged in parallel in the casing in the horizontal direction. At the same time, the air swirling directions of the adjacent precleaner bodies are opposite to each other and swirl toward the upper side in the vertical direction on the adjacent side.

According to the first aspect of the invention, the water mist, dust and the like separated by the air flow and the swirling are discharged into the casing from the axially downstream side of the opening of the first cylindrical body, and transmitted through the inner wall of the casing. And is mainly discharged from the rear side of the discharge portion. Further, the air sucked from the discharge portion due to the negative pressure of the internal combustion engine is mainly taken into the first cylindrical body from the front side of the discharge portion through the opening on the axially upstream side of the first cylindrical body. Therefore, it is possible to replace the water mist, dust, and the like separated by the swirling flow with the air without causing the water mist and the dust to flow back into the intake passage of the first tubular body.

According to the second aspect of the present invention, water mist, dust and the like are discharged efficiently and reliably according to the swirling flow and gravity.

According to the third aspect of the present invention, water drops, dust and the like discharged from the precleaner main bodies which are adjacent to each other in the horizontal direction are collected in the center of both precleaner main bodies and are collected together to increase the weight and are discharged. Therefore, the dischargeability can be further improved.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first example of an embodiment for carrying out the present invention. In the drawings, the parts denoted by the same reference numerals as those in FIG. 10 represent the same parts, and the basic configuration is shown in FIG. It is similar to the conventional one.

In the illustrated example, in the vicinity of the lower end portion of the outer pipe 4, the end portion on the wall surface 2a extending in the axial direction is opened, and the end portion on the blade 6 side is close to the end portion on the blade 6 side of the outer pipe 4. The slit 10 which is an opening and is positioned so as to penetrate through the outer pipe 4 in the radial direction. Further, as shown in FIG. 2, the slit 10 is provided at a position shifted in phase by an angle θ with respect to a vertical line passing through the center of the outer pipe 4 with respect to a downstream side in the air swirl direction (close to the swirl direction).

Next, the operation of the illustrated example will be described. In the intake precleaner 1 of the illustrated example, the air A sucked into the swirl flow forming means 7 due to the negative pressure of the internal combustion engine at the time of driving the internal combustion engine passes through the blades 6 attached to the air inlet. It becomes a swirl flow, and water mist and dust in the air are blown in the circumferential direction by the centrifugal force of the swirl flow, collide with the inner peripheral wall surface of the outer pipe 4, and are collected. For this reason, the water mist and dust aggregate and flow down along the inner peripheral wall surface of the outer pipe 4, and are discharged into the casing 3 from the portion on the downstream side (inner pipe 8 side) in the longitudinal direction of the slit 10 and the gap G. .

Further, due to the negative pressure of the internal combustion engine, the casing 3 from the front side of the discharge portion 9a at the lower end of the unload pipe 9 is shown.
The air A that has flowed into the inside is introduced into the outer pipe 4 from the upstream side (the blade 6 side) in the longitudinal direction of the slit 10.
Entrained in the air A from the swirl flow forming means 7, water mist and dust are removed.

The air A, from which water mist and dust have been removed, flows from the outer pipe 4 through the inner pipe 8 into the intake duct 2, reverses and moves downward, and is introduced into the internal combustion engine via the air cleaner.

The water mist and dust discharged into the casing 3 from the downstream side in the longitudinal direction of the slit 10 formed in the outer pipe 4 travels down the inner wall of the casing 3 and descends to form water drops W mainly from the rear side of the discharge portion 9a. It is discharged to the outside.

In the illustrated example, the water mist and dust removed by the outer pipe 4 and the discharge portion 9 a of the unload pipe 9 are provided.
Since the replacement with the air A introduced from the above is performed well in the slit 10, it is possible to prevent water mist and dust from being entrained in the air A fed to the internal combustion engine.

That is, water mist, dust, etc. separated by the air flow and swirl in the outer pipe 4 are discharged into the casing 3 from the slits 10 on the downstream side of the outer pipe 4, travel along the inner wall of the casing 3, and mainly discharge part 9a. Is discharged to the outside from the rear side of. or,
The air sucked from the discharge portion 9a due to the negative pressure of the internal combustion engine is mainly taken in from the front side of the discharge portion 9a through the axial upstream side of the slit 10 formed in the outer pipe 4 into the outer pipe 4, It is possible to perform replacement with air without causing water mist, dust, etc. separated by the swirling flow to flow back into the intake passage of the outer pipe 4.

Further, since the slit 10 is provided at a position shifted in phase from the vertical line passing through the center of the outer pipe 4 by the angle θ with respect to the downstream side in the air swirl direction (close to the swirl direction), water mist and dust are provided. Etc. are efficiently and reliably discharged according to the swirling flow and gravity.

FIGS. 3 to 5 are second to fourth examples of a mode for carrying out the present invention, and as in the case of FIG. 1, FIG.
The parts denoted by the same reference numerals as are the same,
The basic configuration is the same as the conventional one shown in FIG.

In the second example shown in FIG. 3, in the vicinity of the lower end portion of the outer pipe 4, the outer pipe 4 extends in the axial direction and has an end portion on the side of the wall surface 2a that is open and the end portion on the side opposite to the wall surface 2a. The slit 11 located at the axially intermediate portion and a plurality of circular holes 12 arranged in series at a constant interval from the vicinity of the end of the slit 11 toward the blade 6 are arranged in the outer pipe 4 in the radial direction. It is formed so as to penetrate.
Thus, the slit 11 and the plurality of round holes 12 form an opening.

Similar to the slit 10 in the intake precleaner 1 of FIG. 1, the slit 11 and the round hole 12 are phased with respect to a perpendicular line passing through the center of the outer pipe 4 by an angle θ with respect to the downstream side (closer to the swirling direction) of the air swirling direction. It is provided at a position deviated from (see FIG. 2).

Also in the intake precleaner 1 of this illustrated example, when the internal combustion engine is driven, the air A becomes a swirl flow by passing through the blades 6 attached to the air inlet, and water mist and dust in the air swirl flow. It is blown in the circumferential direction by the centrifugal force of and collides with the inner peripheral wall surface of the outer pipe 4 and is collected.
Therefore, the water mist and dust are aggregated and flow downward along the inner peripheral wall surface of the outer pipe 4, and are discharged into the casing 3 through the slits 11 and the gap G, and the water mist and dust discharged into the casing 3 flow down. Then, it is discharged to the outside from the rear side of the discharge portion 9a.

Further, the discharge portion 9a at the lower end of the unload pipe 9
The air A that has flowed into the casing 3 from the front side is introduced into the outer pipe 4 through the plurality of round holes 12, and is entrained by the air A from the swirl flow forming means 7 to remove water mist and dust.

In the third example shown in FIG. 4, in the vicinity of the lower end portion of the outer pipe 4, a plurality of square holes 13 arranged in a line in the axial direction penetrate the outer pipe 4 in the radial direction as openings. It is provided. Therefore, a plurality of square holes 1
One of the end portions on the side of the wall surface 2a of 3 is open toward the wall surface 2a, and the one of the end portion on the side opposite to the wall surface 2a is located close to the blade 6. Further, like the slit 10 in the intake precleaner 1 of FIG. 1, the square hole 13 is displaced from the vertical line passing through the center of the outer pipe 4 by an angle θ with respect to the downstream side in the air swirl direction (close to the swirl direction). (See FIG. 2).

Also in the intake precleaner 1 of this illustrated example, when the internal combustion engine is driven, the air A becomes a swirl flow by passing through the blades 6 attached to the air inlet, and water mist and dust in the air swirl flow. It is blown in the circumferential direction by the centrifugal force of and collides with the inner peripheral wall surface of the outer pipe 4 and is collected.
For this reason, the water mist and dust are aggregated and flow downward along the inner peripheral wall surface of the outer pipe 4, and the casing 3 from the square hole 13 or the gap G formed on the axially downstream side (the inner pipe 8 side) of the outer pipe 4. The water mist and dust discharged inside and discharged into the casing 3 flow down and are discharged to the outside from the rear side of the discharge portion 9a.

Further, the discharge portion 9a at the lower end of the unload pipe 9
The air A that has flowed into the casing 3 from the front side has the blades 6
Is introduced into the outer pipe 4 from the plurality of square holes 13 on the side,
Entrained in the air A from the swirl flow forming means 7, water mist and dust are removed.

In the fourth example shown in FIG. 5, in the vicinity of the lower end of the outer pipe 4, a plurality of round holes 14 arranged in a line in the axial direction from the wall surface 2a side to the blade 6 side are provided as opening portions. It is provided so as to penetrate the outer pipe 4 in the radial direction. In addition, the round hole 14 corresponds to the intake precleaner 1 of FIG.
Similar to the slit 10 in, the air swirl direction downstream side (closer to the swirl direction) with respect to the perpendicular line passing through the center of the outer pipe 4.
It is provided at a position that is out of phase with the angle θ (see FIG. 2).

Also in the intake precleaner 1 of this illustrated example, when the internal combustion engine is driven, the air A becomes a swirl flow by passing through the blades 6 attached to the air inlet, and water mist and dust in the air swirl flow. It is blown in the circumferential direction by the centrifugal force of and collides with the inner peripheral wall surface of the outer pipe 4 and is collected.
Therefore, the water mist and dust are aggregated and flow downward along the inner peripheral wall surface of the outer pipe 4, and the casing 3 from the round hole 14 or the gap G formed on the axially downstream side (the inner pipe 8 side) of the outer pipe 4. The water mist and dust discharged inside and discharged into the casing 3 flow down and are discharged to the outside from the rear side of the discharge portion 9a.

Further, the discharge portion 9a at the lower end of the unload pipe 9
Air A that has flowed into the casing 3 from the inside is introduced into the outer pipe 4 through the plurality of round holes 14 on the blade 6 side, and is entrained by the air A from the swirl flow forming means 7 to remove water mist and dust.

Also in the illustrated examples shown in FIGS. 3 to 5, the air A from which water mist and dust have been removed flows from the outer pipe 4 through the inner pipe 8 into the intake duct 2 and reverses and heads downward. It is introduced into the internal combustion engine via the air cleaner.

Further, in the illustrated examples shown in FIGS. 3 to 5,
Similar to the illustrated example shown in FIG. 1, the replacement of the water mist and dust removed by the outer pipe 4 with the air A introduced from the unload pipe 9 is performed by slits 11 and a plurality of round holes 12, square holes 13, round holes. Since it is performed satisfactorily in 14, it is possible to prevent water mist and dust from being entrained in the air A sent to the internal combustion engine.

That is, also in the illustrated examples shown in FIGS. 3 to 5, the water mist, dust and the like separated by the air flow and the swirling in the outer pipe 4 have the slit 11, the square hole 13 and the round hole on the downstream side of the outer pipe 4. The air discharged into the casing 3 through the openings 14 and the like, transmitted through the inner wall of the casing 3 and discharged mainly from the rear of the discharge portion 9a to the outside, and the air sucked from the discharge portion 9a by the negative pressure of the internal combustion engine Since the air is mainly taken in from the front of the discharge portion 9a through the axial upstream side of the slit 10 formed in the outer pipe 4 and is taken into the outer pipe 4, the water mist, dust and the like separated by the swirling flow are sucked into the outer pipe 4. The air can be replaced without backflowing into the flow path.

Further, the slit 11, the square hole 13, the round hole 14
Is provided at a position that is out of phase with the vertical line passing through the center of the outer pipe 4 by an angle θ with respect to the downstream side (closer to the swirling direction) of the air swirl direction, so that water mist, dust, etc. follow swirl flow and gravity. Efficient and reliable discharge.

6 to 9 show a fifth example of the embodiment of the present invention, which is a multi-intake pre-cleaner in which pre-cleaner main bodies composed of a swirl flow forming means, an outer pipe and an inner pipe are arranged in multiple stages and multiple rows. This is an example.

The multi-intake precleaner 21 includes a wing portion 22 and a housing portion 23. That is, an opening is formed in the vehicle rear surface of the intake duct 25, and the box-shaped housing body 2 in the housing portion 23 is formed in the opening.
4 is fitted. A wall surface 24 a is formed on a surface of the housing body 24 located inside the intake duct 25.

In the housing body 24, a plurality of stages (5 stages in the illustrated example) of precleaner bodies are arranged in two columns. That is, the outer pipe 26, which is open at both ends in the axial direction, is horizontally arranged in the housing body 24 while being attached to the casing 32 of the wing portion 22,
In the vicinity of the lower end of each outer pipe 26, a slit 27 extending in the axial direction and having an opening on the side facing the wall surface 24a is formed as an opening. The slit 27 penetrates each outer pipe 26 in the radial direction, and as shown in FIG. 7, is provided at a position shifted in phase by an angle θ downstream from the perpendicular line passing through the center of the outer pipe 26 in the air swirling direction. A gap G is formed between the end of the outer pipe 26 on the downstream side in the air flow direction and the wall surface 24a of the housing body 24, as shown in FIG.

At the tip of the outer pipe 26 on the air inlet side, a cylindrical guide member 28 having a hemispherical portion facing the outside is concentrically arranged, and the outer periphery of the guide member 28 and the inner periphery of the outer pipe 26 are separated from each other. The swirl flow forming means 30 is formed by being connected by a plurality of (eight in the illustrated example) blades 29 arranged at a required pitch in the circumferential direction. The swirl flow forming means 30 passes between the vanes 29 and passes through the outer pipe 26.
The blade 29 is for generating a swirling flow in the air A introduced therein. For example, the blade 29 is formed into a twisted fan shape including an arc portion and two straight portions having different lengths.

The blades 29 are twisted in opposite directions by the left and right swirling flow forming means 30, so that the left and right swirling flow forming means 30 can give a reverse swirling flow to the air A. It has become. For example, as shown in FIG. 6, in the swirl flow forming means 30 in the left column when viewed from the front, a counterclockwise swirl flow is generated in the air A introduced into the outer pipe 26, and in the right column. The swirling flow forming means 30 is capable of giving a swirling flow in the clockwise direction to the air A introduced into the outer pipe 26 (see arrows A and B in FIG. 6). That is, the air swirling directions of the adjacent precleaner bodies are opposite to each other and swirl toward the upper side in the vertical direction on the adjacent side.

On the downstream side of the outer pipe 26 in the air flow direction, an inner pipe 31 having both axial ends open and having a diameter smaller than that of the outer pipe 26 is provided.
6 are arranged concentrically. Thus, the end portion of the inner pipe 31 on the upstream side in the air flow direction has the outer pipe 26.
The inner end of the outer pipe 26 on the downstream side in the air flow direction extends to the downstream side in the air flow direction with respect to the downstream end of the outer pipe 26 in the air flow direction. It extends to the inside. Inner pipe 3
The diameter of 1 is made smaller than the diameter of the outer pipe 26 in order to allow the air A flowing through the center of the swirling flow to flow into the inner pipe 31 and to prevent water mist and dust blown to the outside by the centrifugal force of the swirling flow. This is because it is easily removed from the air.

Thus, in the illustrated example, the outer pipe 2
6. The wing portion 22 is formed by the casing 32 to which the swirling flow forming means 30 and the outer pipe 26 are attached,
A housing portion 23 is formed by the inner pipe 31 and the housing body 24 to which the inner pipe 31 is attached. Further, the outer pipe 26, the swirl flow forming means 30, and the inner pipe 31 are arranged in a total of 10 sets, that is, two rows on the left and right, and five steps vertically.
Thus, the multi-intake precleaner 21 is formed.

Outer pipe 26 in wing section 22
At the central portion in the width direction of the lower end of the attached casing 32, a protruding portion 33 having a shape protruding toward the front surface is provided as shown in FIGS. The left and right sides and the upper surface of the protrusion 33 are closed, and the lower end is open. Although the rear surface of the protruding portion 33 is open, when the housing portion 23 and the wing portion 22 are set in the opening portion of the intake duct 25, water is discharged in cooperation with the facing surface of the intake duct 25. The unloader pipe 34 is formed. Thus, the lower end portion of the unloader pipe 34 is the discharge portion 3
4a, even if the discharge portion 34a is always open,
Alternatively, it may have a valve structure.

Next, the operation of the illustrated example will be described. When the internal combustion engine is driven, the wing portion 22 is driven by the negative pressure of the internal combustion engine.
The air A flowing between the vanes 29 of each swirling flow forming means 30 in (1) is given a swirling force by the vanes 29 and is introduced into the outer pipe 26 as a swirling flow. For this reason,
The water mist and dust entrained in the air A are blown to the inner peripheral side of the outer pipe 26 by the centrifugal force, and the outer pipe 2
6 is contacted with the inner peripheral wall of 6, and is collected and agglomerated into particles, forming water droplets W containing dust and flowing down along the inner circumference of the outer pipe 26, and then downstream of the slit 27 in the axial direction of the outer pipe 26 (inner pipe 31 Side) and the gap G to the outside of the outer pipe 26, are gathered to the widthwise center side of the housing body 24 and flow down, and are discharged to the outside from the rear side of the discharge portion 34a of the unloader pipe 34.

When the internal combustion engine is driven, a part of the air A flows from the front side of the discharge portion 34a of the unloader pipe 34 to the axial upstream side of the outer pipe 26 (the blade 29 side) of the slit 27 due to the negative pressure of the internal combustion engine. Flow into the outer pipe 26 and are entrained by the air A that has been swirled by the swirling flow forming means 30. From the outer pipe 26 to the inner pipe 3
1 is introduced into the intake duct 25. Therefore, in the slit 27, water mist and dust and the unloader pipe 3
The replacement with the air A taken in from No. 4 is smoothly performed, and the water droplets W and dust are smoothly discharged from the rear side of the discharge portion 34a of the unloader pipe 34.

Further, the air A from which water mist and dust have been removed in the outer pipe 26 is introduced into the intake duct 25 through the inner pipe 31, turns upside down, passes downward through the air cleaner, and then enters the internal combustion engine. Sent.

In the illustrated example, the water mist and dust collected by the outer pipe 26 of each precleaner body and the air A flowing from the unloader pipe 34 are smoothly replaced, so that they are fed to the internal combustion engine. It is possible to prevent water mist and dust from being entrained in the air A to be blown, and to give a swirling force in the swirling flow forming means 30 to the air swirling directions opposite to each other and to the vertically upper side on the adjacent side. Therefore, the water mist and dust are collected on the center side in the width direction of the housing body 24. Therefore, the water droplets W and dust discharged from the slits 10 of the adjacent left and right precleaners are in the center of both precleaner bodies. Since they are collected on the side and are collected together to increase the weight and are discharged, the drainage property is further improved.

The intake precleaner structure of the present invention is
Of course, the present invention is not limited to the illustrated examples, and various modifications can be made without departing from the scope of the invention.

[0055]

As described above, the first aspect of the present invention is as described above.
According to the intake precleaner structure described in any one of 3 to 3, the water and air can be easily replaced, so that there is no possibility that water mist and dust are entrained in the air sent to the internal combustion engine, and the drainage performance is improved. In the case of the intake precleaner structure of claim 3,
Various excellent effects such as further improved drainage can be achieved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first example of an embodiment of an intake precleaner structure of the present invention.

FIG. 2 is a sectional view of the outer pipe shown in FIG. 1 taken along the line II-II.

FIG. 3 is a vertical sectional view of a second example of the embodiment of the intake precleaner structure of the present invention.

FIG. 4 is a vertical sectional view of a third example of the embodiment of the intake precleaner structure of the present invention.

FIG. 5 is a vertical sectional view of a fourth example of the embodiment of the intake precleaner structure of the present invention.

FIG. 6 is a front view of an example of a multi-intake precleaner in a fifth example of the embodiment of the intake precleaner structure of the present invention.

FIG. 7 is a front view of a housing portion applied to the multi-intake precleaner of FIG.

8 is a VIII-VIII direction arrow view of FIG. 6;

FIG. 9 is a perspective view of a wing portion applied to the multi-intake precleaner of FIG.

FIG. 10 is a vertical sectional view of an example of a conventional intake precleaner structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 intake precleaner (intake precleaner structure) 2 intake duct 2a wall surface 3 casing 4 outer pipe (first cylindrical body) 7 swirl flow forming means 8 inner pipe (second cylindrical body) 9a discharge part 10 slit (opening) 11 Slit (Opening) 12 Round Hole (Opening) 13 Square Hole (Opening) 14 Round Hole (Opening) 21 Multi-Intake Precleaner (Intake Precleaner Structure) 25 Intake Duct 26 Outer Pipe (First Cylindrical Body) 27 slit (opening) 30 swirl flow forming means 31 inner pipe (second tubular body) 32 casing 34a discharge part

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02M 35/10 301D (72) Inventor Hiroshi Urushihara 3-1-1 Hinodai, Hino-shi, Tokyo Hino Motors Ltd. (72) Inventor Hideki Endo 3-1-1 Hinodai, Hino-shi, Tokyo Hino Motors Ltd. (72) Inventor Yasuhiro Okazaki 1-1-1 Toyota-cho, Kariya-shi, Aichi Toyota Boshoku Co., Ltd. (72) Inventor Hitoshi Wakita 1-1-1 Toyota-cho, Kariya city, Aichi Prefecture Toyota Boshoku Co., Ltd.

Claims (3)

[Claims] 1. A swirl flow forming means for making the introduced air a swirl flow, a first cylindrical body provided with the swirl flow forming means on an upstream side in an air flow direction, and one end of the first cylindrical body. Of the pre-cleaner body, which comprises a second tubular body having a diameter smaller than that of the first tubular body, which is coaxially communicated to the downstream side in the air flow direction and whose other end is communicated to the intake duct. In the intake precleaner structure, which comprises a casing that accommodates the first cylindrical body and has a discharge portion provided below,
An intake precleaner structure characterized in that an opening extending in the axial direction is provided near the lower end of the first tubular body. 2. The intake precleaner structure according to claim 1, wherein the opening is arranged at a lower end portion of the first tubular body toward a turning direction with respect to a perpendicular line passing through an axis of the first tubular body. Intake pre-cleaner structure characterized by 3. The intake precleaner structure according to claim 1 or 2, wherein a plurality of precleaner bodies are arranged in parallel in the casing in the horizontal direction, and the air swirl direction of the adjacent precleaner bodies is increased. The intake pre-cleaner structure is characterized in that the two are swung in the opposite directions and toward the upper side in the vertical direction on the adjacent side.