JP2002310021A - Intake air precleaner structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an instake air precleaner structure capable of minimizing infiltration of water into the inside from a surface opening in respective separating scavenging parts. SOLUTION: A water infiltration preventive drip channel 17 overhanging in an eaves shape so as to open a lower part, is arranged in a surface opening edge part in the respective separating scavenging parts 15 of a wing part 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake pre-cleaner structure for separating and collecting foreign matter such as dust and water contained in air supplied to an engine air cleaner.

[0002]

2. Description of the Related Art Generally, as shown in FIGS.
In the case of a vehicle 1 such as a truck, an air cleaner 3 for supplying air to an engine (not shown) is disposed at a lower portion on one side in the left and right direction on the rear surface of the cab 2 of the vehicle 1. The intake hood 5 is placed on the upper end of the intake duct 4 so that water such as rain can be prevented from entering the intake duct 4 and air can be supplied to the lower surface of the intake hood 5. The air is drawn into the intake duct 4 so as to make a U-turn through the opening formed, filtered by the air cleaner 3, and supplied to the engine as clean air.

[0003]

The structure of the intake duct 4 covered with the intake hood 5 as shown in FIGS. 4 and 5 is excellent in preventing water from being absorbed by rain and has a simple structure. Despite the benefits,
Due to the U-turn intake, there is a disadvantage that the intake resistance is large, which affects the engine performance, and that the splash mist blown up by another vehicle easily enters during traveling.

For this reason, as shown in FIG. 6 and FIG. 7, the present inventors have designed a side surface (FIG. 6) of an intake duct 4 that is erected to be connected to an air cleaner 3 that supplies air to the engine of the vehicle 1. A large suction port 6 is opened on the rear side of the vehicle 1 in the example of FIG. 7, and a pre-cleaner 7 that separates and collects foreign matters such as dust and water contained in the air at the suction port 6.
The intake pre-cleaner structure reduces the intake resistance, improves the engine performance, and prevents the entry of foreign substances such as dust and water into the intake duct 4 to improve the reliability of the engine. Development was in progress.

As shown in FIGS. 8 and 9, the pre-cleaner 7 has a box-shaped housing portion 8 having an open surface.
And a wing part 9 integrally assembled so as to cover the opening of the housing part 8. The housing part 8 with the wing part 9 integrally assembled is fitted into the suction port 6 of the intake duct 4. It has become.

A plurality of rows (two rows in the example of FIG. 8) are provided on the wall surface 8a of the housing portion 8 located inside the intake duct 4 in an axial direction of a plurality of levels (five levels in the example of FIG. 8). An inner pipe 10 having both open ends is disposed substantially horizontally.

The inner pipe 1 in the wing section 9
0, the outer pipe 11 whose both ends in the axial direction are open and whose diameter is larger than the diameter of the inner pipe 10 is
It is arranged concentrically with the inner pipe 10.

A cylindrical guide member 12 having an outer portion formed in a hemispherical shape is concentrically disposed at the air inlet side end of the outer pipe 11, and the outer periphery of the guide member 12 and the inner periphery of the outer pipe 11 are provided. Are connected by a plurality (eight in the example of FIG. 8) of blades 13 arranged at a required pitch in the circumferential direction to form a swirl flow forming body 14. The swirl flow forming body 14 passes between the blades 13 and
This is for generating a swirling flow in the air introduced therein. For example, the blade 13 has a fan-shaped shape with a twist.

In the pre-cleaner 7 shown in FIGS. 8 and 9, each of the outer pipes 11, the swirl flow forming body 14 formed by the blades 13 provided between the outer pipe 11 and the guide member 12, and the inner pipe 10, a total of ten sets of separating and collecting units 15 are formed, two rows on the left and right and five steps on the upper and lower sides. A drain 16 is formed at the lower end of the wing 9 for discharging foreign matters such as dust and water collected at the bottom of the housing 8 to the outside. .

In the precleaner 7 as described above, when the engine is driven, air flows between the blades 13 of the swirling flow forming body 14 in each of the separate collecting portions 15 of the wing portion 9 to generate a swirling force. The fluid is provided and swirled to be introduced into the outer pipe 11. For this reason, foreign matter such as dust and water entrained in the air flows along the inner periphery of the outer pipe 11 due to the centrifugal force, flows out of the downstream end of the outer pipe 11 in the air flow direction, into the housing portion 8, and flows into the housing portion 8. And is discharged to the outside through the drain port 16.

The air from which foreign matter such as dust and water has been removed in the outer pipe 11 is introduced into the intake duct 4 through the inner pipe 10 and goes downward, whereupon the air cleaner 3
And is supplied to the engine as clean air.

However, in the case of the pre-cleaner 7 as shown in FIGS. 8 and 9, when water droplets adhering to the surface of the wing portion 9 flow down, the pre-cleaner 7 passes through the surface opening in each of the separation collecting portions 15. Although it is easily sucked into the inside and water is separated by centrifugal force inside, it cannot be said to be very preferable, and there is room for improvement.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an intake pre-cleaner structure capable of minimizing the intrusion of water into the inside from the surface opening in each separation / collection unit.

[0014]

According to the present invention, a housing portion and a wing portion are integrally formed at a suction opening formed on a side surface of an intake duct which is erected to be connected to an air cleaner for supplying air to an engine of a vehicle. An intake pre-cleaner structure, which is provided with a pre-cleaner that is assembled and formed with a plurality of separation and collection portions for foreign matters contained in air, and is configured to prevent entry of foreign matters into the intake duct. The present invention relates to an intake pre-cleaner structure, characterized in that a drip channel for preventing water intrusion is provided at an edge of a surface opening of each separation and collection part of a wing part so as to open a lower part so as to open the lower part. .

In the intake pre-cleaner structure, the amount of protrusion of the lower end of the drip channel can be gradually reduced downward.

According to the above means, the following effects can be obtained.

When the water droplets adhering to the surface of the wing portion flow downward, the water droplets approach the surface openings of the respective separating / collecting portions, and the surface droplets of the respective separating / collecting portions along the surface of the drip channel. Therefore, it is difficult for water to be sucked into the inside of the pre-cleaner from the surface openings in the respective separating / collecting sections.

Here, if the drip channel is formed in a pipe shape instead of an eaves shape in which the lower part is opened, the inlet flow velocity at the surface opening in each separation collecting part increases, and water adhering to the outer peripheral lower part of the drip channel is removed. There is a possibility that a new problem may be caused in that the drip channel is sucked from the surface opening in each separation / collection unit. The flow velocity does not rise more than necessary, and there is no fear that water is sucked in from the surface openings in the respective separating and collecting sections.

In the intake pre-cleaner structure, when the amount of protrusion of the lower end portion of the drip channel is gradually reduced downward, the surface opening in each of the separation collecting portions from the surface of the wing portion along the surface of the drip channel. The water droplets flowing so as to avoid are formed along the surface at the lower end portion of the drip channel and smoothly guided to the surface of the wing portion again. It is possible to avoid being sucked into the inside of the pre-cleaner from the surface opening in the above, which is more advantageous.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an example of an embodiment of the present invention. In the drawings, the portions denoted by the same reference numerals as those in FIGS. 6 to 9
However, as shown in FIGS. 1 and 2, the feature of the illustrated example is that the lower part is opened at the edge of the surface opening of each separation collecting part 15 of the wing part 9. The drip channel 17 for preventing water intrusion that protrudes like an eave is provided.

In the illustrated example, the amount of protrusion of the lower end of the drip channel 17 gradually decreases downward.

Next, the operation of the illustrated example will be described.

When the water droplets adhering to the surface of the wing portion 9 flow downward and approach the vicinity of the surface opening in each of the separation / collection portions 15, the water droplets move along the surface of the drip channel 17. Since the water flows so as to avoid the surface opening at 15, it is difficult for water to be sucked into the inside of the pre-cleaner 7 from the surface opening at each separation / collection unit 15.

Here, if the drip channel 17 is formed into a pipe shape instead of an eaves shape in which the lower part is opened, the inlet flow velocity at the surface opening in each separation collecting part 15 increases, and the drip channel 17 adheres to the lower part of the outer periphery of the drip channel 17. There is a possibility that a new problem may occur in that spilled water is sucked from a surface opening in each of the separation / collection sections 15. 15, the inlet flow velocity at the surface opening does not rise more than necessary,
There is no fear of being sucked through the surface opening in 5.

The amount of protrusion of the lower end of the drip channel 17 is gradually reduced downward, so that each separation and collection section 15 extends along the surface of the drip channel 17 from the surface of the wing 9. Water droplets flowing so as to avoid the surface opening are formed along the surface at the lower end portion of the drip channel 17 and smoothly guided to the surface of the wing portion 9 again, and the water droplets drop from the lower end portion of the drip channel 17. As a result, it is possible to avoid being sucked into the inside of the pre-cleaner 7 from the surface opening of each separation / collection section 15.

In this way, the intrusion of water from the surface opening in each of the separation / collection sections 15 to the inside can be suppressed to a minimum.

It should be noted that the intake precleaner structure of the present invention is not limited to the above illustrated example, and the shape of the drip channel 17 is such that one side extends obliquely downward as shown in FIG. Other things that may be
It goes without saying that various changes can be made without departing from the spirit of the present invention.

[0029]

As described above, according to the intake pre-cleaner structure of the present invention, an excellent effect of minimizing intrusion of water into the inside from the surface opening in each of the separating and collecting portions is exhibited. obtain.

[Brief description of the drawings]

FIG. 1 is a front view of an example of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a front view of a modification of the embodiment for carrying out the present invention.

FIG. 4 is a side view of a vehicle provided with a conventional intake duct.

FIG. 5 is a view taken in the direction of arrows VV in FIG. 4;

FIG. 6 is a side view of a vehicle equipped with a pre-cleaner which is being developed by the present inventors.

FIG. 7 is a view taken along the line VII-VII in FIG. 6;

FIG. 8 is a front view showing a conventional example of the precleaner shown in FIG.

FIG. 9 is a sectional view taken along line IX-IX of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle 3 Air cleaner 4 Intake duct 6 Suction port 7 Precleaner 8 Housing part 9 Wing part 14 Swirling flow forming body 15 Separate collection part 16 Drainage port 17 Drip channel

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hideki Endo 3-1-1, Hinodai, Hino-shi, Tokyo F-term in Hino Motor Co., Ltd. 3D038 BA03 BA04 BA12 BB03 BC02 BC03 BC15

Claims (2)

[Claims] 1. A housing and a wing are integrally assembled to a suction opening opened on a side surface of an intake duct which is erected to be connected to an air cleaner for supplying air to an engine of a vehicle. An intake pre-cleaner structure in which a pre-cleaner is formed by forming a plurality of separated collecting portions for contained foreign matter to prevent foreign matter from entering the intake duct, and each separation collecting portion of the wing portion is provided. 3. A suction pre-cleaner structure, characterized in that a drip channel for preventing water intrusion is provided at an edge portion of a surface opening of the device to protrude like an eaves so that a lower portion is opened. 2. The intake pre-cleaner structure according to claim 1, wherein the amount of protrusion of the lower end of the drip channel is gradually reduced downward.