KR102332315B1 - Dust collecting railway wheel assembly - Google Patents

Abstract

According to an embodiment of the present invention, there is provided a wheel assembly for a rail capable of collecting impurities, in a vehicle wheel assembly moving along a rail, comprising: a wheel in contact with an upper surface of the rail and rolling in motion; a connection support unit connecting the wheel and other wheels in contact with the upper surface of the same rail; and an impurity collecting unit formed in the connection support unit to collect or remove impurities present in the air surrounding the transportation means.

Description

Wheel assembly for a rail capable of collecting impurities {DUST COLLECTING RAILWAY WHEEL ASSEMBLY}

The present invention relates to a wheel assembly for a rail capable of collecting impurities, and more particularly, is mounted on a wheel (wheel) assembly of a rail vehicle such as a train (train) or subway to suck air and fine dust contained in the sucked air It relates to a wheel assembly for rails capable of collecting impurities that can remove impurities such as powder and fine fragments generated by the running of a rail vehicle.

Recently, air pollution caused by fine dust has become a big problem. The main cause of fine dust in the city center is exhaust gas from internal combustion engine vehicles, but fine dust can be generated not only by internal combustion engine vehicles but also by rail vehicles, that is, subways or trains (trains).

In the case of subways, operation is performed in a closed underground space, and fine dust such as dust caused by friction between rails and train wheels, dust that has settled on the floor, and dust generated from passenger cars affects the flow of air according to the operation of the subway. Air pollution caused by air pollution is known to be several to tens of times more polluted than general outdoor air.

In particular, when the subway enters a station where passengers are waiting, air flows by the moving subway to move fine particles or fine dust present in a large amount in the subway tunnel to the station.

Therefore, passengers using the subway and those involved in subway operation may get respiratory diseases by being exposed to polluted air. It can cause serious harm to the human body.

In addition, not only subways, but also general trains and high-speed trains may generate scattering dust such as iron powder due to friction between wheels and rails while driving, and fine dust may be generated from passenger cars of the train.

Accordingly, as shown in FIG. 1 , it is necessary to collect or remove impurities such as fine dust or scattering dust generated from the wheel 10 of the rail vehicle 1 .

The present applicant has proposed the present invention in order to solve the above problems.

Korean Patent Publication No. 10-1130178 (2012.03.19.)

The present invention has been proposed to solve the above problems, and a wheel assembly for rail capable of collecting impurities that can remove or collect impurities such as fine dust or scattering dust generated in rail vehicles such as trains or subways provides

A wheel assembly for a rail capable of collecting impurities according to an embodiment of the present invention for achieving the above object, in the wheel assembly for a vehicle moving along the rail, is in contact with the upper surface of the rail, and the rolling motion is wheel; a connection support unit connecting the wheel and other wheels in contact with the upper surface of the same rail; and an impurity collecting unit formed in the connection support unit to collect or remove impurities present in the air surrounding the transportation means.

The impurity collecting unit may suck in air by an airflow generated around the wheel when the transportation means travels, and collect or remove impurities contained in the air.

The impurity collecting part may include a casing formed in the connection support part and into which air is sucked, and a filtering part formed in the casing to block the flow of the sucked air.

An impurity tray for collecting impurities contained in the air is formed under the casing, and when the air sucked into the casing collides with the filter unit, impurities contained in the air may fall into the impurity tray.

An air intake portion is formed at the front end of the casing along the running direction of the transportation means or the longitudinal direction of the rail, and an air discharge portion is formed at the rear end of the casing, and the air intake portion and the air exhaust portion face the rail It may be formed to be inclined to do so.

The filter unit may be arranged alternately or alternately on the upper and lower surfaces of the casing, and the length of the filtering unit formed on the upper surface of the casing and the filtering unit formed on the lower surface of the casing may be different.

The filtering unit may be formed to connect the upper and lower surfaces of the casing at an angle, or may be formed in a zigzag shape.

The filtering unit may operate as an electromagnet.

and a bearing housing provided on a side surface of the wheel to receive one end of a shaft that transmits a rotational driving force to the wheel, and an auxiliary impurity collecting unit formed in the bearing housing.

The auxiliary impurity collecting unit may include an air inlet formed on an outer circumferential surface of the bearing housing and an air outlet formed on a flat surface of the bearing housing.

A dust collecting means for collecting or removing impurities contained in the air may be formed inside the bearing housing.

Since the wheel assembly for a rail capable of collecting impurities according to the present invention is installed near the wheel of a subway or train (train), it is possible to increase the collection amount of fine dust or scattering dust generated by friction between the rail and the wheel during driving.

Since the wheel assembly for a rail capable of collecting impurities according to the present invention has an electromagnet function, it can also collect heavy impurities such as iron powder.

The wheel assembly for a rail capable of collecting impurities according to the present invention can be installed without increasing the size of the wheel assembly because it is attached to the structure of the wheel assembly or uses an internal surplus space of the wheel assembly.

1 is a view showing a general rail vehicle.
2 is a view showing a wheel assembly for a rail capable of collecting impurities according to an embodiment of the present invention.
FIG. 3 is a view showing the inside of the impurity collecting part mounted on the wheel assembly according to FIG. 2 .
FIG. 4 is a view showing the inside of a modified example of the impurity collecting unit according to FIG. 3 .
5 is a view showing a wheel assembly for a rail capable of collecting impurities according to another embodiment of the present invention.
6 is a cross-sectional view of a part of the wheel assembly according to FIG. 5 ;

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the examples. Like reference numerals in each figure indicate like elements.

2 is a view showing a wheel assembly for a rail capable of collecting impurities according to an embodiment of the present invention, FIG. 3 is a view showing the inside of an impurity collecting part mounted on the wheel assembly according to FIG. 2, FIG. 4 is FIG. FIG. 5 is a view showing a wheel assembly for a rail capable of collecting impurities according to another embodiment of the present invention, FIG. 6 is a view showing a part of the wheel assembly according to FIG. It is a cross section.

The wheel assembly for a rail capable of collecting impurities according to the present invention (hereinafter referred to as "wheel assembly") refers to a wheel of a transportation means running on rails, such as a subway, a train (train), and a high-speed train, that is, a wheel assembly. Therefore, hereinafter, the transportation means is a comprehensive concept including traveling along rails such as subways, trains (trains), high-speed trains, and industrial crane vehicles.

2 to 4 , the wheel assembly 100 according to an embodiment of the present invention is illustrated as being provided under the transportation means 1 . Here, the transportation means 1 is a concept including a carriage, a driver's car, or a cargo car.

Meanwhile, FIG. 2 shows the wheel assembly 100 as viewed from one side in the longitudinal direction of the carriage 1 . That is, for convenience, only one of the two wheels 10 mounted on both ends of one shaft (refer to 11 in FIG. 6 ) and traveling along the rail 2 is illustrated.

In the wheel assembly 100 for a rail capable of collecting impurities according to an embodiment of the present invention, in the wheel assembly 100 for a vehicle moving along the rail 2, it is in contact with the upper surface of the rail 2, rolling wheel 10; a connecting support unit 20 connecting the wheel 10 and other wheels in contact with the upper surface of the same rail 2 to each other; and an impurity collecting unit 50 formed in the connection support unit 20 to collect or remove impurities present in the ambient air of the transportation means 1 .

Here, the impurities collected or removed by the impurity collecting unit 50 are fine dust and/or scattering generated from the wheels positioned in front of the connection support unit 20 or the passenger cars positioned in front of the connecting support unit 20 while the transport means 1 is running. It may contain dust. In addition, the impurities may include iron powder generated by friction between the wheel and the rail, and may include fine dust and/or scattering dust generated when the transport means 1 is stopped.

The wheel 10 is a wheel for driving the transport means 1 while rolling on the upper surface of the rail 2 , and a pair of wheels 10 may be connected by the connection support 20 on the same rail 2 . In other words, the wheel assembly 100 includes a pair of wheels positioned back and forth on one of the pair of rails, and a pair of wheels connected to both ends of the shaft so as to be respectively positioned on the pair of rails. FIG. 2 shows a pair of wheels 10 positioned back and forth along the longitudinal or running direction of the vehicle 1 on one of the pair of rails 2 .

The connecting support unit 20 is a member for connecting and elastically supporting a pair of wheels 10 positioned at the front and back. That is, the connecting support 20 is a member serving as a shock absorber that connects the pair of front and rear wheels 10 to each other.

Referring to FIG. 2 , the connecting support unit 20 includes a frame 21 formed in a ring shape so that both ends are connected to a shaft (not shown) of a pair of wheels 10 and a coil spring formed in the middle of the frame 21 . (22) may be included. The coil spring 22 is an elastic member that absorbs shock so that the shock or vibration generated as the transportation means 1 travels is not transmitted to the carriage of the transportation means 1 .

As shown in FIG. 2 , the frame 21 has an approximately inverted trapezoidal shape, and the impurity collecting part 50 may be formed on the lower side having a short length. Here, it may be formed integrally with the connection support unit 20 or the frame 21, or may be formed to be detachable.

The impurity collecting part 50 may be formed in the connecting support part 20 so as to be positioned between a pair of wheels 10 positioned back and forth on the same rail 2 . As described above, since the impurity collecting unit 50 is positioned between the pair of wheels 10 , when the transportation means 1 moves forward or backward, in the wheel 10 positioned in front of the impurity collecting unit 50 , It is advantageous to capture or remove the impurities generated.

Rail transportation means such as subways, trains, and high-speed trains generate iron powder or various dust or dust between rails and wheels while traveling at high speed and spread into the air. It is effective to dispose the impurity collecting unit 50 in the vicinity. In the present invention, by disposing the impurity collecting unit 50 between the pair of wheels 10 arranged in the front and rear, more impurities can be collected or removed from the location closest to the position where the impurities are generated.

The impurity collecting unit 50 may suck in air by an airflow generated around the wheel 10 when the transportation means 1 travels, and collect or remove impurities contained in the air. In the wheel assembly 100 according to the present invention, impurities can be collected or removed from the impurity collecting unit 50 by using an air flow, that is, an air flow, generated when the transportation means travels at a high speed. ), there is no need for a separate means for introducing impurities into the

The impurity collecting part 50 shown in FIG. 3 is formed on the connection support part 20 and formed inside the casing 51 and the casing 51 through which air is sucked into the filtration to prevent the flow of the sucked air. A portion 58 may be included. For reference, FIG. 3 is a cross-sectional view of the impurity collecting unit 50 .

The casing 51 is attached to the lowermost surface of the frame 21 and is preferably formed in a size so that sufficient air can be introduced and a sufficient space can be formed therein so that the filtering unit 58 can be installed.

The casing 51 is preferably formed in a trapezoidal shape elongated along the running direction of the vehicle 1 or the longitudinal direction of the rail 2 . In this case, the trapezoidal shape is preferably formed in an inverted trapezoidal shape, that is, a trapezoidal shape in which the upper straight part is longer than the lower straight part.

An air intake portion 52 is formed at the front end of the casing 51 along the running direction of the transportation means 1 or the longitudinal direction of the rail 2 , and an air discharge portion 54 is formed at the rear end of the casing 51 . ) can be formed. As described above, the casing 51 should be able to introduce impurities such as iron powder generated at the friction portion between the wheel 10 and the rail 2 . Accordingly, the air intake portion 52 formed in the front of the casing 51 and the air exhaust portion 54 formed in the rear portion of the casing 51 may be inclined to face the rail (2). That is, as shown in FIG. 3 , the air intake part 52 and the air exhaust part 54 are preferably formed obliquely to face the upper surface of the rail 2 .

When the vehicle 1 shown in FIG. 2 travels from right to left, the front wheel 10 rotates counterclockwise. Accordingly, impurities such as iron powder generated from the contact or friction between the wheel 10 and the rail 2 are thrown out toward the air intake part 52 of the casing 51 . These impurities may be guided into the air intake unit 52 along the flow of air. If the transportation means 1 travels from left to right, impurities may be introduced through the air outlet 54 of the casing 51 .

Here, the air intake portion 52 and the air exhaust portion 54 formed at both ends of the casing 51 may be interchanged with each other according to the traveling direction of the transportation means (1).

A filtering unit 58 that blocks the flow of the inflow air containing impurities may be formed inside the casing 51 . When the air containing impurities introduced through the air intake unit 52 is discharged directly through the air discharge unit 54, the impurities contained in the air cannot be removed. In order to collect or remove impurities contained in the air from the inside of the casing 51, it is necessary to lengthen the time the air stays inside the casing 51. For this purpose, a filtering part 58 is formed in the inside of the casing 51. can do.

Referring to FIG. 3 , the filtering unit 58 is a partition wall formed on the inner floor and ceiling of the casing 51 . These filtering units 58 may be alternately arranged on the upper surface and the lower surface of the casing 51 or alternately. That is, the lower end of the filtering unit 58 formed on the upper surface of the casing 51 is not connected to the lower surface of the casing 51 and is spaced apart, and the upper end of the filtering unit 58 formed on the lower surface of the casing 51 is the casing ( 51) is not connected to the upper surface and is spaced apart. At this time, it is preferable that the filtering unit 58 formed on the upper surface of the casing 51 and the filtering unit 58 formed on the lower surface of the casing 51 are alternately arranged, respectively.

Meanwhile, the length of the filtering unit 58 formed on the upper surface of the casing 51 and the filtering unit formed on the lower surface of the casing 51 may be formed differently. Referring to FIG. 3 , the filtering unit 58 formed on the upper surface of the casing 51 is longer than the filtering unit 58 formed on the lower surface, but is not necessarily limited thereto.

In the case of FIG. 3 , the air introduced through the air intake unit 52 first collides with the filter unit 58 formed on the upper surface of the casing 51 , and the filter unit 58 first collides with the introduced air. It is preferable to be formed to be relatively long. Since the transportation means 1 travels at a high speed, the air introduced into the casing 51 is also introduced and discharged at a high speed. However, if the speed of the air passing through the air suction unit 52 is not immediately reduced, the time the air stays inside the casing 51 is reduced, and as a result, the amount of impurities collected is inevitably reduced. Therefore, it is preferable that the filtering unit 58, which first collides with the air introduced through the air suction unit 52, is formed to be relatively long.

The air introduced through the air suction unit 52 may not maintain a uniform flow by colliding with the filter unit 58 , and air may flow irregularly in the casing 51 . In this case, impurities contained in the air may also collide with the filtering unit 58 to lose kinetic energy and fall downward. An impurity tray 56 may be formed at a lower portion of the casing 51 in order to collect impurities falling from the lower surface to the bottom of the casing 51 .

As such, an impurity tray 56 for collecting impurities contained in the air is formed in the lower portion of the casing 51 , and when the air sucked into the casing 51 collides with the filtration unit 58 , impurities contained in the air are removed from the impurity tray (56) can be dropped.

The impurity tray 56 may have a form detachable from the lower portion of the casing 51 . For example, the impurity tray 56 preferably has a drawer-like shape.

It is preferable that the lower surface or the bottom of the casing 51 positioned above the impurity tray 56 be provided in the form of a mesh or in a form in which a plurality of micro-structures are formed. The lower surface or bottom of the casing 51 preferably has a mesh or a hole formed therein so that impurities falling down by colliding with the filtering unit 58 can be collected in the impurity tray 56 .

When the transportation means 1 is running, impurities may collide with the filter unit 58 to collect and remove impurities in the impurity tray 56 .

By the way, when the transportation means 1 does not travel and stops, air does not flow into the casing 51 because no air flow occurs. In the wheel assembly 100 according to the present invention, the filtering unit 58 can operate as an electromagnet so that impurities such as iron powder can be collected even while the transportation means 1 is stopped. That is, the filtering unit 58 may be formed to have an electromagnet function. By supplying electricity to the filtering unit 58 to make it an electromagnet, impurities such as iron powder may adhere to the filtering unit 58, and after a sufficient time to remove the impurities has elapsed, the electricity supplied to the filtering unit 58 is turned off. When blocked, the filter unit 58 loses its electromagnet function, so that the attached impurities may fall into the impurity tray 56 . As described above, since the impurity collecting part 50 of the wheel assembly 100 according to the present invention may have an electromagnet function, it is possible to effectively collect and remove impurities such as iron powder even when the transportation means 1 is stopped.

4 shows the deformed impurity collecting unit 60 . As in the case of FIG. 3 , the impurity collecting unit 60 may include a casing 61 formed in the frame 21 of the connection support 20 and a filtering unit 68 provided in the casing 61 . have. An impurity tray 66 may be provided under the casing 61 . An air inlet 62 and an air outlet 64 may be formed at the front end and the rear end of the casing 61 , respectively.

The impurity collecting unit 60 shown in FIG. 4 is different from the filtering unit 58 of the impurity collecting unit 50 shown in FIG. 3 in the configuration or shape of the filtering unit 68, and the rest are shown in FIG. It is the same as that of the impurity collecting unit 50 . A description of the same configuration will be omitted.

Referring to FIG. 4 , the filtering unit 68 may be formed to obliquely connect the upper and lower surfaces of the casing 61 or may be formed in a zigzag shape. The filtering part 68 is preferably formed at an angle to face the bottom of the casing 61 or the impurity tray 66 .

The filtration unit 68 shown in FIG. 4 is a filter type filtration unit. That is, since it is a filter type filtration unit 68 , air can pass through the filter unit 68 . For this reason, the upper and lower ends of the filtering unit 68 may be formed to be respectively connected to the upper and lower surfaces of the casing 61 .

Since the filtration unit 68 functions as a filter, impurities such as iron powder do not pass through the filtration unit 68 and are adsorbed or caught in the filtration unit 68 . When the amount of impurities caught in the filter unit 68 increases, the impurities may fall downward toward the lower surface of the casing 61 and be collected in the impurity tray 66 .

In addition, the filter 68 shown in Fig. 4 can also act as an electromagnet. Therefore, even when the transportation means 1 is stopped, the filtering unit 68 can collect impurities and the like.

Meanwhile, FIGS. 5 and 6 show a wheel assembly 200 for a rail capable of collecting impurities according to another embodiment of the present invention.

5 and 6 , in the wheel assembly 200 for a rail capable of collecting impurities according to another embodiment of the present invention, the impurity collecting part 50 is formed in the frame 21 of the connection support part 20 described above. In addition, an auxiliary impurity collecting part 70 formed in the bearing housing 13 may be further included.

In the wheel 10 of the wheel assembly 200 according to another embodiment of the present invention, a flange 12 is formed extending in the radial direction of the wheel 10 on the inner side of both ends in the width direction in contact with the rail 2 . can be

A shaft 11 that transmits a driving force of a driving unit (not shown) may be coupled to the wheel 10 . A bearing housing 13 accommodating one end of the shaft 11 that transmits rotational driving force to the wheel 10 may be provided inside and outside the wheel 10 . The bearing housing 13 is a member having a predetermined space therein to accommodate the inner bearing 16 and the outer bearing 14 supporting the shaft 11 from the inner and outer sides of the wheel 10 , respectively.

The wheel assembly 200 according to another embodiment of the present invention may include an auxiliary impurity collecting part 70 formed in the bearing housing 13 . In more detail, the auxiliary impurity collecting part 70 may be formed in the bearing housing 13 provided on the outside of the wheel 10 .

The auxiliary impurity collecting unit 70 may include an air inlet 71 formed on the outer circumferential surface of the bearing housing 13 and an air outlet 81 formed in the flat portion 80 of the bearing housing 13 . .

The air inlet 71 is formed to protrude from the circumferential outer peripheral surface of the bearing housing 13, and air containing impurities by the flow of air generated as the transportation means 1 travels through the air inlet 71. can be imported.

The air inlet 71 preferably has a curved or bent shape toward the traveling direction of the transportation means (1).

The auxiliary impurity collecting unit 70 may include dust collecting means such as a filter (not shown) formed inside the bearing housing 13 . Impurities contained in the air may be collected or removed by the dust collecting means provided in the bearing housing 13 .

Air from which impurities are removed may be discharged to the outside of the bearing housing 13 through the air outlet 81 .

As described above, in an embodiment of the present invention, specific matters such as specific components, etc., and limited embodiments and drawings have been described, but these are only provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments. It is not limited, and various modifications and variations are possible from these descriptions by those of ordinary skill in the art to which the present invention pertains. Accordingly, the spirit of the present invention should not be limited to the described embodiments, and not only the claims described below, but also all those with equivalent or equivalent modifications to the claims will fall within the scope of the spirit of the present invention.

1: mode of transport 2: rail
10: wheel 11: shaft
12: flange 13: bearing housing
14, 16: bearing 20: connection support
21: frame 22: coil spring
50, 60: impurity collecting part 51, 61: casing
52, 62: air intake 54, 64: air exhaust
56,66: impurity tray 58,68: filtration unit
70: auxiliary impurity collecting unit 71: air inlet
81: air outlet
100,200: wheel assembly for rail capable of collecting impurities

Claims (9)

A wheel assembly for a vehicle moving along a rail, the wheel assembly comprising:
a wheel in contact with the upper surface of the rail and in rolling motion;
a connection support unit connecting the wheel and other wheels in contact with the upper surface of the same rail; and
and an impurity collecting unit formed in the connection support unit to collect or remove impurities present in the surrounding air of the transportation means; and
The impurity collecting unit sucks air by the airflow generated around the wheel when the transportation means is running, and collects or removes impurities contained in the air,
The impurity collecting part is formed in the connection support part and the air is sucked into the casing; and a filtering unit formed inside the casing to prevent the flow of the sucked air.
The casing is elongated along the running direction of the transportation means or the longitudinal direction of the rail, an air intake portion is formed at the front end of the casing, and an air outlet portion is formed at the rear end of the casing,
The filtering unit is provided with a plurality of partition walls formed on the floor and the ceiling in the casing,
The partition walls are respectively disposed along the longitudinal direction of the casing on the upper surface and the lower surface of the casing, the lower ends of the partition walls formed on the upper surface of the casing are spaced apart from the lower surface of the casing, and the upper ends of the partition walls formed on the lower surface of the casing are the It is spaced apart from the upper surface of the casing,
The partition walls formed on the upper surface of the casing and the partition walls formed on the lower surface of the casing are alternately arranged along the longitudinal direction of the casing to alternately guide the air flowing along the inside of the casing in the vertical direction. A wheel assembly for rails capable of collecting impurities.
According to claim 1,
The barrier ribs formed on the upper surface of the casing and the barrier ribs formed on the lower surface of the casing are formed to have different lengths,
Among the partition walls formed on the upper surface of the casing or the partition walls formed on the lower surface of the casing, the length of the partition walls that first collide with the air sucked into the air intake part is longer than the length of the other partition walls. wheel assembly.
A wheel assembly for a vehicle moving along a rail, the wheel assembly comprising:
a wheel in contact with the upper surface of the rail and in rolling motion;
a connection support unit connecting the wheel and other wheels in contact with the upper surface of the same rail; and
and an impurity collecting unit formed in the connection support unit to collect or remove impurities present in the surrounding air of the transportation means; and
The impurity collecting unit sucks air by the airflow generated around the wheel when the transportation means is running, and collects or removes impurities contained in the air,
The impurity collecting part is formed in the connection support part and the air is sucked into the casing; and a filtering unit formed inside the casing to prevent the flow of the sucked air.
The casing is elongated along the running direction of the transportation means or the longitudinal direction of the rail, an air intake portion is formed at the front end of the casing, and an air outlet portion is formed at the rear end of the casing,
The filtration unit is provided as a filter type filtration unit obliquely connected to the upper and lower surfaces of the casing to adsorb or catch impurities contained in the air in the process of passing the air sucked into the air suction unit,
A wheel assembly for a rail capable of collecting impurities, characterized in that a plurality of filter-type filtration units are arranged in the same shape along the longitudinal direction of the casing or in a zig-zag form along the longitudinal direction of the casing.
4. The method according to any one of claims 1 to 3,
An impurity tray for collecting impurities contained in the air is formed under the casing,
When the air sucked into the casing collides with the filter unit, impurities contained in the air fall into the impurity tray.
4. The method according to any one of claims 1 to 3,
The casing is formed in an inverted trapezoid shape with an upper surface longer than a lower surface,
The air intake portion is inclined in one direction toward the rail at the front end of the casing, and the air outlet portion is inclined in the other direction toward the rail at the rear end of the casing. assembly.
delete delete 4. The method according to any one of claims 1 to 3,
and a bearing housing provided on a side surface of the wheel to receive one end of a shaft that transmits rotational driving force to the wheel, and an auxiliary impurity collecting unit formed in the bearing housing.
9. The method of claim 8,
The bearing housing is provided in a cylindrical shape on the side surface of the wheel,
The auxiliary impurity collecting unit may include: an air inlet formed on an outer circumferential surface of the bearing housing; and an air outlet formed on a flat portion of the bearing housing.
The air inlet protrudes to have a curved or bent shape toward the traveling direction of the transportation means,
and dust collecting means for collecting or removing impurities contained in the air introduced into the air inlet is provided inside the bearing housing.

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