JP2019064326A - Transportation vehicle - Google Patents

Abstract

To provide a transportation vehicle which does not require maintenance, and has such a structure that automatically collects and discharge dusts.SOLUTION: In this transportation vehicle, a cooling air supply device (16) is so configured as to have: a duct (25) which flows cooling air toward an alternator (18); a cooling fan (21); and a dust collection unit (24) which collects dusts contained in cooling air, and thereafter, can discharge the dusts. The dust collection unit is located on an inner wall (26) of the duct on which a centrifugal force of cooling air acts, and has an inlet (33), an outlet (34), and a seesaw member (29A) which is rotated around a fulcrum (27). When the cooling fan is utilized, the seesaw member is rotated by cooling air pressure, the inlet is opened and the outlet is closed, and thus, becomes such a state as to be capable of collecting dusts, and when the cooling fan is stopped, the seesaw member is rotated, the inlet is closed and the outlet is opened, and thus, becomes such a state as to be capable of discharging dusts.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a transport vehicle such as, for example, a dump truck that transports minerals and the like mined in a mine or the like.

  Generally, in open pit mining sites and mines, a large amount of minerals and sediment are excavated using a hydraulic shovel, and the excavated large quantities of minerals (crushed rocks) are loaded on a large transport vehicle called dump truck, The work of transporting to the unloading site is carried out.

  In particular, in the case of a large dump truck adopting alternating current (AC) drive drive, the engine drives a generator, the electricity is controlled by an inverter, and then an alternating current motor is driven to travel. Since the generator generates heat as energy loss due to the electrical resistance of the coil, it is necessary to forcibly send cooling air into the generator to cool the generator.

  In a mine where a large dump truck operates, dust and dirt generated by a loading machine and a leading traveling vehicle contain a large amount of impurities such as sand (hereinafter referred to as dust) in the atmosphere. Therefore, if the air containing dust is directly taken into the generator mounted on the transport vehicle, the dust may cause the insulation coating of the generator to wear, and the insulation resistance may be reduced.

  If the use of the generator is continued while the insulating coating is worn in this manner, the wear may progress and the insulator may disappear, eventually resulting in dielectric breakdown and the rotor may become unusable. Although the extension of generator life is considered to be the most effective means to remove dust from the cooling air, the dust collection device with a filter requires regular maintenance, and the cooling performance due to the clogging of the filter There is a concern for decline.

  Then, the technique which extends the clogging life of a filter and isolate | separates the dust in the air is also proposed, and "the intake structure to a vehicle interior of a vehicle" (refer patent document 1) is mentioned as an example.

Patent No. 4535631 gazette

  In Patent Document 1 mentioned above, in an intake structure for a vehicle such as a construction machine, a cyclone type dust separator is disposed to separate the dust, and the separated dust is separated by a pressure difference between the atmospheric pressure and the intake pressure. A technique for automatically discharging using an open / close valve that opens and closes is disclosed.

  However, in the dust separator here, if the dust continues to accumulate and becomes heavy, the spring-type on / off valve extends and opens, and air escapes from the open port, whereby the amount of air flowing into the engine decreases and cooling There is a problem that the function is degraded. In addition, when the spring function is deteriorated when the dust is discharged by the on-off valve, the opening area is reduced, so that the amount of the discharged dust is reduced, which causes a problem that the discharge efficiency of the dust is deteriorated. In order to solve these problems, it is necessary to perform maintenance frequently, so in Patent Document 1, problems remain in maintainability.

  The present invention has been made to solve such problems, and its technical problem is to provide a transport vehicle having a structure that can automatically collect and discharge dust without requiring maintenance. .

  In order to solve the above technical problems, one aspect of the present invention is a vehicle body, an engine mounted on the vehicle body, an alternator driven by the engine to generate electric power, and cooling air for supplying cooling air to the alternator. In the transport vehicle provided with a supply device, the cooling air supply device includes a duct for flowing cooling air toward the alternator, a cooling fan provided in the duct for sucking in and discharging the cooling air, and the duct And a dust collection device which is provided and capable of discharging after collecting dust contained in the cooling air, the dust collection device is characterized in that the centrifugal force of the cooling air in the duct acts on the dust collection device. It is disposed on the inner wall of the duct remote from the axial center of the cooling fan, and is located inside the duct and an inlet for taking in the dust; An outlet for discharging the dust to the outside, a seesaw member provided between the inlet and the outlet and pivoting about a fulcrum, and an outlet from the inlet to the outside of the duct. A guide portion which is formed to extend and guides the dust from the inlet to the outlet, the seesaw member is provided at one end side across the fulcrum, and a lid which opens and closes the inlet; A collection part which is provided on the other end side across the fulcrum, opens and closes the outlet, and contacts the guide part to form a closed space with the guide part, and the inner side of the duct from the lid part The seesaw member is rotated when the air intake portion is pressed by the cooling air pressure when the cooling fan is operated, the inlet is opened, and the outlet is closed. Formed by the collection portion The dust can be collected in the closed space, and the inlet is closed when the cooling fan is stopped to close the inlet, and the outlet can be opened to discharge the dust. Do.

  According to the present invention, with the above configuration, it is possible to provide a transport vehicle having a structure capable of automatically collecting and discharging dust without requiring maintenance. In addition, the subject except having mentioned above, a structure, and an effect are clarified by description of the following embodiment.

FIG. 1 is a side view partially showing a basic configuration of a dump truck that is an embodiment of a transport vehicle according to the present invention. It is the block diagram which showed schematic structure of the cooling system apparatus with which the dump truck shown in FIG. 1 is equipped. It is the schematic of the principal part which shows the cooling structure to the alternator with which the dump truck shown in FIG. 1 is equipped with the attachment structure of a dust collection apparatus. It is the figure which showed the dump truck shown in FIG. 1 from the upper surface direction. It is the figure which showed the dump truck shown in FIG. 1 from the back surface direction. It is the schematic which showed the basic composition and operation | movement of the dust collection apparatus which concern on 1st Embodiment, Comprising: It is a figure which shows the state which can collect the dust at the time of a cooling fan working. It is the schematic which showed the basic composition and operation | movement of the dust collection apparatus which concern on 1st Embodiment, Comprising: It is a figure which shows the state which can discharge | emit the dust at the time of a cooling fan stop. It is the schematic which showed the basic composition and operation | movement of the dust collection apparatus which concern on 2nd Embodiment, Comprising: It is a figure which shows the state which can collect the dust at the time of a cooling fan working. It is the schematic which showed the basic composition and operation | movement of the dust collection apparatus which concern on 2nd Embodiment, Comprising: It is a figure which shows the state which can discharge | emit the dust at the time of a cooling fan stop. It is the schematic which showed the basic composition and operation | movement of the dust collection apparatus which concern on 3rd Embodiment, Comprising: It is a figure which shows the state which can collect the dust at the time of a cooling fan working. It is the schematic which showed the basic composition and operation | movement of the dust collection apparatus which concern on 3rd Embodiment, Comprising: It is a figure which shows the state which can discharge | emit the dust at the time of a cooling fan stop.

  Hereinafter, embodiments of a transport vehicle according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a side view partially showing a basic configuration of a dump truck 1 according to an embodiment of a transport vehicle according to the present invention. The dump truck 1 is a large-sized transportation vehicle for transporting crushed stone (mineral) or the like mined in a mine or the like, and a heavy frame 2 such as a crushed stone on the vehicle body 2 and a solid frame structure. And a load carrier (vessel) 3 for loading a large amount of The vehicle body 2 is configured to include a frame 4, a building 5, a deck 6, and a cab 7 which will be described later. The frame 4 is a base of the vehicle body 2 and is formed as a strong support structure having a can structure, and is disposed at a base frame 8 extending in the front-rear direction and an intermediate portion in the front-rear direction of the base frame 8 It is roughly constituted by the upper cross beam 9.

  The base frame 8 includes left and right legs 8A (only the left side is shown) extended in a bifurcated shape (V-shaped or U-shaped) toward the front (shown only in left) and a length direction of each leg 8A The left and right support portions 8B (only the left side is shown) protruding upward from the middle position in the front-rear direction) are provided. An engine 10 described later is disposed between the legs 8A. An upper cross beam 9 that constitutes the frame 4 together with the base frame 8 is formed in a hollow prism extending in the left-right direction, and is attached to the upper end of each support 8 B that constitutes the base frame 8. The upper cross beam 9 projects from the support portions 8B of the base frame 8 in the left-right direction and supports the deck 6, the cab 7, the control cabinet 11 and the like described later from below.

  The left and right front wheels 12 rotatably provided on the front side of the vehicle body 2 constitute steered wheels that are steered (steering operation) by the operator of the dump truck 1. Each front wheel 12 has a tire diameter (outer dimension) ranging, for example, from 2 to 4 meters, similarly to the left and right rear wheels 13 described later. Each rear wheel 13 rotatably provided on the rear side of the vehicle body 2 constitutes a drive wheel of the dump truck 1 and is rotatably supported by a rear axle housing 14 described later. Each rear wheel 13 is rotationally driven by an electric motor 15 which will be described later, which is accommodated in the rear axle housing 14. A rear axle housing 14 provided on the lower rear side of the vehicle body 2 is formed as a cylindrical body extending between the rear wheels 13 in the axial direction (the left-right direction of the vehicle body 2).

  The rear axle housing 14 houses a pair of electric motors 15 described later for driving the rear wheels 13 individually. The rotation of the output shaft of each of the electric motors 15 is transmitted to each rear wheel 13 as a low speed, large torque via a gear reduction mechanism (not shown) or the like. An electric motor side duct 17 of a cooling air supply device 16 to be described later is connected to an axial intermediate portion of the rear axle housing 14, and each electric motor 15 is indirectly driven by the cooling air supplied through the electric motor side duct 17. It is configured to be cooled.

  The building 5 which constitutes a part of the vehicle body 2 is attached to each leg 8A while being located in front of each support 8B. In addition, the building 5 cooperates with the upper cross beam 9 to support the deck 6 described below from below. The deck 6 provided on the upper side of the building 5 is disposed at a position above the front wheels 12 and forms a flat passage surface or the like on the front upper building 5 of the vehicle body 2. On the deck 6, a cab 7 and the like to be described later are installed. A cab 7 located on the front of the loading platform 3 and provided on the left side of the upper end of the vehicle body 2 is disposed on the deck 6 and is supported from below by the upper cross beam 9 of the frame 4 and the building 5.

  The engine 10 mounted on the vehicle body 2 and located below the upper cross beam 9 of the frame 4 is configured using, for example, a large diesel engine or the like, and drives an alternator 18 described later. An alternator 18 driven by the engine 10 is for generating drive power to be output to an electric motor 15 described later, and generates, for example, three-phase AC power of about 1500 kW. Further, an alternator side duct 19 of a cooling air supply device 16 to be described later is connected to the alternator 18, and the alternator 18 is directly cooled by the cooling air supplied through the alternator side duct 19.

  The pair of traveling electric motors 15 provided in the rear axle housing 14 are constituted by large electric motors such as, for example, a three-phase induction motor and a three-phase brushless DC motor, and the rear wheels 13 are rotated independently of each other. To drive. Here, drive electric power based on the electric power generation of the alternator 18 is supplied to each electric motor 15, and the rotation shaft of each electric motor 15 is rotated by the supply of this drive electric power. The rotation of the rotation shaft of each electric motor 15 is transmitted to each rear wheel 13 via a gear reduction mechanism (not shown) or the like, and the dump truck 1 travels according to the rotation of each rear wheel 13.

  A control cabinet 11 provided at the center of the upper end of the vehicle body 2 along the right side of the cab 7 is supported from the lower side by an upper cross beam 9 of the frame 4. The control cabinet 11 contains an inverter for controlling each electric motor 15 for traveling, a control panel for controlling the current generated by the alternator 18 and the rotational speed of the engine 10, a radiator for cooling the cooling water for the inverter, etc. It is done. The control cabinet 11 here has a function of accommodating an inverter and a control panel, and constitutes a passage for supplying cooling air to a cooling air supply device 16 described later. For this reason, a cooling air intake port 11A for taking in outside air as cooling air is provided on the front of the control cabinet 11 so as to open. Further, at the bottom of the control cabinet 11, a cooling air outlet 11B, which is an outlet of the cooling air from which the cooling air introduced into the control cabinet 11 flows out, is opened.

  The cooling air supply device 16 flows in from the cooling air inlet 11A of the control cabinet 11, takes in the outside air flowing out from the cooling air outlet 11B as the cooling air, and supplies the cooling air to the alternator 18 and the electric motor 15. Thereby, the alternator 18 and the electric motor 15 are cooled. The cooling air supply device 16 includes a cooling air supply passage 20 through which the cooling air flows, a dust collection device 24 for removing dust 30 in the cooling air, an alternator side cooling fan 21 and an electric motor side cooling fan 22. Mostly configured.

  The cooling air supply passage 20 includes a collecting box (plenum box) 23 for taking in the cooling air flowing out of the cooling air outlet 11B provided in the control cabinet 11. Further, the cooling air supply passage 20 has a cylindrical alternator side duct 19 which branches from the collecting box 23 and guides the cooling air to the alternator 18 and a cylindrical shape which branches from the collecting box 23 and guides the cooling air to the electric motor 15. And an electric motor side duct 17. The collecting box 23 is attached to the lower side of the control cabinet 11 using a fixing tool (not shown) such as a bolt and is in communication with the cooling air outlet 11 B of the control cabinet 11. Incidentally, the collecting box 23 can also be regarded as a duct for flowing the cooling air toward the alternator 18.

  FIG. 2 is a block diagram showing a schematic configuration of a cooling system provided in the dump truck 1 described above. As shown in FIG. 2, in the cooling system device, the cooling air supply device 16 cools the alternator 18 and the respective electric motors 15 in the rear axle housing 14 in response to the intake of the cooling air in the control cabinet 11.

  Specifically, the cooling air flowing in from the cooling air inlet 11A of the control cabinet 11 and flowing out from the cooling air outlet 11B is taken in by the collecting box 23 of the cooling air supply device 16. The cooling air taken in by the collecting box 23 is guided to the alternator side duct 19 and the electric motor side duct 17. Since the alternator side duct 19 is provided with the alternator side cooling fan 21, the cooling air that has flowed into the collecting box 23 flows to the alternator side duct 19 by the alternator side cooling fan 21. That is, the alternator side cooling fan 21 sucks in and discharges the cooling air. Further, since the electric motor side cooling fan 22 is provided in the electric motor side duct 17, the cooling air flowing into the collecting box 23 also flows to the electric motor side duct 17 by the electric motor side cooling fan 22. That is, the electric motor side cooling fan 22 also sucks in and discharges the cooling air. As a result, the cooling air flowing into the collecting box 23 is divided into the alternator duct 19 and the electric motor duct 17.

  Here, the cooling air supply device 16 in the present embodiment is supplied into the alternator 18 by the shape of the cooling air supply path 20 (the shapes of the ducts 17 and 19) and the arrangement of the alternator 18 and the electric motors 15. The cooling air may collide directly with the stator and rotor coils (not shown). On the other hand, the cooling air supplied into the rear axle housing 14 does not directly collide with the electric motors 15. For this reason, in the present embodiment, by installing the dust collection device 24 on the side of the alternator 18, measures are taken to prevent the insulating coating of the stator and rotor coil of the alternator 18 from being abraded by dust in the cooling air. There is. On the other hand, since the cooling air supplied into the rear axle housing 14 does not directly collide with the respective electric motors 15, the dust collecting device 24 is provided because the possibility of the problem of the abrasion of the insulating coating is low. Absent.

  FIG. 3 is a schematic view of the main part showing the cooling structure (the main part of the cooling air supply device 16) to the alternator 18 provided in the dump truck 1 described above in combination with the mounting structure of the dust collection device 24. In this cooling structure for the alternator 18, the dust collecting device 24 provided on the alternator side ventilation duct 25 at a position between the alternator side cooling fan 21 and the alternator 18 for collecting and discharging dust is used as the alternator side ventilation duct 25. It is provided.

  The cooling air discharged from the control cabinet 11 through the collecting box 23 and the alternator side duct 19 by the alternator side cooling fan 21 generates a centrifugal force when passing through the bent surface portion of the alternator side ventilation duct 25. At this time, since the dust particles having mass tend to go straight by inertia force, if the dust collecting device 24 is provided in the specific area 26 where the centrifugal force by the cooling air on the side surface of the ventilation duct 25 on the alternator side works, Dust can be collected efficiently. The specific area 26 shows the inner wall of the alternator side ventilation duct (duct) 25 on the side far from the axial center of the alternator side cooling fan 21. In addition, as long as the installation location of the dust collection apparatus 24 is an area | region where the centrifugal force by cooling air works, it may be any position. For example, it is also possible to install the dust collection device 24 in the collecting box 23 instead of the alternator side ventilation duct 25 as shown in FIG.

  FIG. 4 is a view showing the above-described dump truck 1 from above. Moreover, FIG. 5 is the figure which showed the dump truck 1 mentioned above from the rear surface direction. As shown in FIG. 4, the dust collection device 24 is installed at the center of the vehicle body 2, and the place where the dust collected by the dust collection device 24 is discharged is also the center of the vehicle body 2. Therefore, as shown in FIG. 5, it is assumed that the dump truck 1 resumes traveling after the dust 30 is discharged to the center of the vehicle body 2. Even in such a case, since the discharged dust 30 is at the center of the vehicle body 2, the dust 30 is not wound up by the front wheels 12 and the rear wheels 13 regardless of forward and reverse travel.

  In the embodiment described above, since the cooling air directly strikes the alternator 18 and the cooling air indirectly strikes the electric motors 15, the dust collecting device 24 is provided only on the alternator 18 side. On the other hand, in the case where the cooling air is directly applied to each electric motor 15 and the cooling air is indirectly applied to the alternator 18, the dust collecting device 24 may be provided only on each electric motor 15 side. . Moreover, it goes without saying that the dust collection device 24 can be used for the cooling system in the entire transport vehicle, besides being installed in the cooling system of the dump truck 1. Hereinafter, the detailed configuration in the case where the dust collection device 24 is provided only on the side of the alternator 18 will be described in detail by citing some embodiments.

First Embodiment
6A and 6B are schematic diagrams showing the basic configuration and operation of the dust collection device 24A according to the first embodiment provided in the dump truck 1 described above. FIG. 6A is a view showing a state in which dust 30 can be collected when the cooling fan is in operation, and FIG. 6B is a view showing a state in which the dust 30 can be discharged when the cooling fan is stopped.

  As shown in FIGS. 6A and 6B, the dust collection device 24A according to the first embodiment is disposed in the specific area 26 where the centrifugal force of the cooling air in the alternator side ventilation duct 25 acts, and the alternator side ventilation duct A dust collection inlet (inlet) 33 for taking in the dust 30 located inside 25 and a dust outlet (outlet) 34 for discharging the dust 30 outside located on the outside of the alternator side ventilation duct 25 And a seesaw member 29A provided between the dust collection inlet 33 and the dust outlet 34 and pivoted about a hinge 27 serving as a fulcrum, extending from the dust collection inlet 33 to the outside of the alternator side ventilation duct 25 And a guide portion G for guiding the dust 30 from the dust collection inlet 33 to the dust outlet 34. The guide portion G is integrally formed with the alternator side ventilation duct 25.

  The seesaw member 29A is provided on one end side (inside of the alternator side ventilation duct 25) across the hinge (fulcrum point) 27 and covers the lid 28B for opening and closing the dust collection inlet 33 and the other end side across the hinge 27 ( The collector 28A is provided on the outer side of the alternator side ventilation duct 25 and opens and closes the dust outlet 34 and contacts the guide G to form a closed space with the guide G, and the lid 28B. Among them, there is a wind receiving portion 28C bent and extended from the position between the hinge 27 and the end of the lid portion 28B (in this example, the end) to the inside of the air duct 25 on the alternator side. The seesaw member 29A has a shape in which a difference in mass is given to the lid 27B so as to be rotatable about the hinge 27 so that the lid 28B and the air receiving portion 28C> the collection portion 28A. .

  Specifically, the collection portion 28A has a short dimension including a length L1 coupled to the hinge 27 and a length L0 bent in a direction perpendicular thereto. The lid 28B has an elongated dimension consisting of a piece of length L2 coupled to the hinge 27. The air receiving portion 28C has a short dimension consisting of a portion having a length L3 bent in an obtuse angle direction from the lid portion 28B. The piece with the length L1 and the piece with the length L2 are integrated to form the same plane. The collection portion 28A, the lid portion 28B and the air receiving portion 28C perform a seesaw operation centering on the hinge 27. A pin or the like may be used instead of the hinge 27.

  The length L0 and the length L1 of the piece in the collecting portion 28A, the length L2 of the piece in the lid 28B, and the length L3 of the piece in the air receiving portion 28C have the following physical characteristics and It is selected to satisfy the relationship of design matters. First, the relationship between the mass W1 of the collection portion 28A and the mass W2 of the lid 28B and the air receiving portion 28C is W1 <W2. Second, the relationship between the wind pressure P1 received by the collection unit 28A and the wind pressure P2 received by the cover 28B is P1 <P2. Thirdly, the relationship between the opening angle θ1 of the air receiving portion 28C and the alternator side ventilation duct 25 and the angle θ2 of the curved surface portion of the alternator side ventilation duct 25 is θ1θθ2.

  By satisfying the relationship of such conditions, the wind receiving portion 28C related to the seesaw member 29A is pushed by the wind pressure (cooling air pressure) of the cooling air when the alternator side cooling fan 21 shown in FIG. 6A is in operation. Thereby, the collection part 28A, the cover part 28B, and the air receiving part 28C rotate counterclockwise around the hinge 27 as a fulcrum. Along with this, a gap is generated between the lid portion 28B and the alternator side air flow duct 25, and the dust collection inlet 33 is formed.

  At this time, the gap (dust discharge port 34) between the collection portion 28A and the guide portion G which is formed by extending from the alternator side ventilation duct 25 is closed simultaneously, and a closed space is formed between the collection portion 28A and the guide portion G. The dust 30 can be collected in the closed space. That is, since the relationship between the wind pressure P1 received by the collection portion 28A and the wind pressure P2 received by the lid portion 28B during operation of the alternator side cooling fan 21 is P1 <P2, the dust discharge port 34 is not formed. As a result, the collection possible state of dust 30 is held stably, and dust 30 can be collected efficiently.

  On the other hand, when the alternator-side cooling fan 21 shown in FIG. 6B is stopped, the cooling air pressure does not act on the seesaw member 29A. Furthermore, since the relationship between the mass W1 of the collection portion 28A and the mass W2 of the lid portion 28B and the air reception portion 28C is W1 <W2, the center of gravity of the seesaw member 29A is the lid 27B with respect to the hinge 27 and the air reception portion 28C side. As a result, the seesaw member 29A rotates clockwise about the hinge 27 as a fulcrum. Along with this, the dust collection inlet 33 in the gap between the lid portion 28B and the alternator side air flow duct 25 is closed. At this time, a gap is simultaneously formed between the collection portion 28A and the guide portion G to form the dust discharge port 34, and the dust 30 can be discharged. As a result, the dischargeable state of the dust 30 can be stably maintained, and the dust 30 can be discharged automatically and efficiently.

  In the dust collection device 24A according to the first embodiment, a filter may be attached to the collection unit 28A. In this case, it is possible to prevent the dust 30 from being rolled up in the dust collection portion formed by the collection portion 28A and the alternator side ventilation duct 25 being closed by the filter. As a result, the dust 30 can be collected more stably.

  As described above, according to the dust collection device 24A of the first embodiment, the dust 30 can be efficiently and stably stabilized by the action of the cooling air pressure during operation of the alternator side cooling fan 21 (during operation of the engine 10). When the operation is stopped and the alternator side cooling fan 21 stops (during the stop of the engine 10), the seesaw member 29A is inclined by its own weight (mass difference) and the dust 30 can be discharged automatically and efficiently. In addition, since the dust collection device 24A has a simple configuration using the seesaw member 29A, maintenance is unnecessary and the usability is good. In the first embodiment, it is also possible to use a pin in place of the hinge 27 as a fulcrum.

"2nd Embodiment"
FIGS. 7A and 7B are schematic views showing the basic configuration and operation of the dust collection device 24B according to the second embodiment provided in the dump truck 1 described above. FIG. 7A is a view showing a state in which dust 30 can be collected when the cooling fan is in operation, and FIG. 7B is a view showing a state in which the dust 30 can be discharged when the cooling fan is stopped.

  As shown in FIGS. 7A and 7B, the dust collection device 24B according to the second embodiment has a seesaw member 29B having a shape different from that of the seesaw member 29A as compared to the dust collection device 24A described above. The point which provided the elastic body 31 of (1) is different. The dust collection device 24B is also disposed in the specific area 26 where the centrifugal force of the cooling air in the alternator side air flow duct 25 acts. The seesaw member 29B here also includes the cover 28B and the collection unit 28A similar to the first embodiment. In addition, the lid 28B is provided with a wind receiving portion 28C extending from the position between the hinge 27 and the end of the lid 28B, here, from the position of the hinge 27 to the inward direction of the alternator side ventilation duct 25. The collecting portion 28A has a short dimension consisting of one portion of a length L1 coupled to the hinge 27 and a length L0 bent in a direction perpendicular thereto. The lid portion 28B has an elongated dimension consisting of a piece of length L4 coupled to the hinge 27. The air receiving portion 28C has a short dimension of a piece of length L5 coupled to the hinge 27 so as to stand up. The piece with the length L1 and the piece with the length L4 are formed integrally so as to form the same plane. Further, in the dust collection device 24B, it is connected to the air receiving portion 28C and the inner wall of the alternator side ventilation duct 25 so that the dust 30 can be discharged to the seesaw member 29B when the alternator side cooling fan 21 is not operating. A first elastic body 31 for holding is provided.

  The length L0, the length L1, the length L1 of the piece in the lid 28B, the length L5 of the piece in the air receiving portion 28C, and the spring of the first elastic body 31 The constant K1 is selected to satisfy the following requirements. This requirement is that the relationship between the wind pressure P1 received by the collection unit 28A and the wind pressure P2 received by the lid 28B is P1 <P2. Further, the spring constant K1 of the first elastic body 31 has an elastic force for holding the dust 30 in a state where the dust 30 can be discharged to the air receiving portion 28C of the seesaw member 29B. That is, this elastic force is only required to close the dust discharge port 34 and open the dust collection inlet 33 at the time of operation in the alternator side cooling fan 21 and open the dust discharge port 34 and close the dust collection inlet 33 at stop. .

  By satisfying such requirements, the wind receiving portion 28C related to the seesaw member 29B is pushed by the wind pressure (cooling air pressure) of the cooling air at the time of operation of the alternator side cooling fan 21 shown in FIG. 7A. As a result, the collecting portion 28A, the lid 28B, and the air receiving portion 28C rotate counterclockwise against the elastic force of the first elastic body 31 with the hinge 27 as a fulcrum. Along with this, a gap is generated between the lid portion 28B and the alternator side air flow duct 25, and the dust collection inlet 33 is formed. At this time, the gap (dust discharge port 34) between the collection portion 28A and the guide portion G is simultaneously closed, and a closed space is formed between the collection portion 28A and the guide portion G. It becomes a state that can be collected. Since the relationship between the wind pressure P1 received by the collection unit 28A and the wind pressure P2 received by the cover 28B during operation of the alternator-side cooling fan 21 is P1 <P2, the dust discharge port 34 is not formed. As a result, the collection possible state of dust 30 is held stably, and dust 30 can be collected efficiently.

  On the other hand, when the alternator-side cooling fan 21 shown in FIG. 7B is stopped, the elastic force (restoring force) of the first elastic body 31 acts on the air receiving portion 28C of the seesaw member 29B. Thereby, the collection part 28A, the cover part 28B, and the wind receiving part 28C rotate clockwise around the hinge 27 as a fulcrum. Along with this, the dust collection inlet 33 in the gap between the lid portion 28B and the alternator side air flow duct 25 is closed. At this time, a gap is simultaneously formed between the collection portion 28A and the guide portion G to form the dust discharge port 34, and the dust 30 can be discharged. At this time, the elastic force of the first elastic body 31 stabilizes the open state of the dust discharge port 34. As a result, the dischargeable state of the dust 30 can be more stably maintained, and the dust 30 can be discharged automatically and efficiently.

  As described above, according to the dust collection device 24B of the second embodiment, the dust is provided by providing the first elastic body 31 in addition to the same effects as the first embodiment. There is an advantage that 30 discharges can be performed more stably.

  Incidentally, also in the dust collection device 24B according to the second embodiment, a filter is attached to the collection part 28A, or the mass W1 of the collection part 28A and the air receiving part 28C and the mass W2 of the lid 28B. The relationship may be operated as W1 <W2. Even when the relationship between the mass W1 of the collection portion 28A and the air receiving portion 28C and the mass W2 of the lid portion 28B is made to satisfy W1 <W2 as in the latter case, the requirements for the elastic force of the first elastic body 31 are the same. It is. However, since the elastic force of the first elastic body 31 acts on the air receiving portion 28C, the mass W1 of the collecting portion 28A and the air receiving portion 28C can be made close to the mass W2 of the lid 28B.

"3rd Embodiment"
8A and 8B are schematic views showing the basic configuration and operation of the dust collection device 24C according to the third embodiment provided in the dump truck 1 described above. FIG. 8A is a diagram related to a state in which dust 30 can be collected when the cooling fan is in operation, and FIG. 8B is a diagram related to a state in which the dust 30 can be discharged when the cooling fan is stopped.

  As shown in FIGS. 8A and 8B, the dust collection device 24C according to the third embodiment has a dust collection inlet capable of discharging dust 30 other than the seesaw member 29B as compared with the dust collection device 24B described above. The difference is that an inlet shielding member is provided to shield 33 separately. The dust collection device 24C is also disposed in the specific area 26 where the centrifugal force of the cooling air in the alternator side air flow duct 25 acts.

  In the inlet shielding member in the third embodiment, a shielding plate 28D is attached to the inclined angle portion of the alternator side air flow duct 25 using a hinge 27 'which is a fulcrum, and between the inclined surface of the alternator side air flow duct 25 and the shielding plate 28D. The second elastic body 31 'is attached to the That is, the inlet shielding member shields the dust collecting inlet 33 by the elastic force of the second elastic body 31 'in a state where the seesaw member 29B can discharge the dust 30 when the alternator side cooling fan 21 is not operating. The second elastic body 31 ′ is in the inlet shielding port 35 existing between the dust collection inlet 33 and the dust outlet 34, and between the shielding plate 28 D of the inlet shielding member and the guiding portion G. It is provided to press the plate 28D. This second elastic body 31 ′ has an elastic force that receives the cooling air pressure during operation of the alternator side cooling fan 21 and opens the dust collection inlet 33 and shields the dust collection inlet 33 when stopped. good. Incidentally, the relationship between the spring constant K1 of the first elastic body 31 and the spring constant K2 of the second elastic body 31 'is K1 <K2.

  By satisfying these requirements, at the time of operation of the alternator-side cooling fan 21 shown in FIG. 8A, the air receiving portion 28C relating to the seesaw member 29B is first pushed by the air pressure (cooling air pressure) of the cooling air. As a result, the collecting portion 28A, the lid 28B, and the air receiving portion 28C rotate counterclockwise against the elastic force of the first elastic body 31 with the hinge 27 as a fulcrum. Along with this, a gap is generated between the lid portion 28B and the shielding plate 28D, and the dust collection inlet 33 is formed. At this time, the gap (dust discharge port 34) between the collection portion 28A and the guide portion G is simultaneously closed, and a closed space is formed between the collection portion 28A and the guide portion G. It becomes a state that can be collected.

  Furthermore, the shielding plate 28D is pushed by the wind pressure (cooling air pressure) of the cooling air blown from the dust collection inlet 33, and the shielding plate 28D resists the elastic force of the second elastic body 31 'with the hinge 27' as a fulcrum. Rotate counterclockwise. Along with this, the gap between the shielding plate 28D and the air receiving portion 28C widens, and a state where the dust 30 can be collected well can be obtained. As a result, the cooling performance is maintained without the cooling air being released to the outside, and the state capable of collecting the dust 30 is stably held, and the dust 30 can be collected efficiently.

  Here, since the relationship between the spring constant K1 of the first elastic body 31 and the spring constant K2 of the second elastic body 31 ′ is K1 <K2, the elastic force F1 of the first elastic body 31 and the second force The relationship of the elastic force F2 of the elastic body 31 'is F1 <F2. Therefore, due to the difference in elastic force, the timing at which the shielding plate 28D is pushed by the wind pressure of the cooling air is later than the timing at which the air receiving portion 28C related to the seesaw member 29B is pushed by the wind pressure of the cooling air. Since the time difference between these timings allows the dust collection port 33 to be opened by the shielding plate 28D after the seesaw member 29B is rotated counterclockwise and the dust outlet 34 is closed, the cooling air Never leak outside.

  On the other hand, when the alternator-side cooling fan 21 shown in FIG. 8B is stopped, the elastic force (restoring force) of the first elastic body 31 first acts on the air receiving portion 28C of the seesaw member 29B. Thereby, the collection part 28A, the cover part 28B, and the wind receiving part 28C rotate clockwise around the hinge 27 as a fulcrum. Along with this, the dust collection inlet 33 in the gap between the lid portion 28B and the shielding plate 28D is closed. At this time, a gap is simultaneously formed between the collection portion 28A and the guide portion G to form the dust discharge port 34, and the dust 30 can be discharged.

  Furthermore, the elastic force (restoring force) of the second elastic body 31 'acts on the shielding plate 28D. As a result, the shielding plate 28D rotates clockwise about the hinge 27 '. Along with this, the dust collection inlet 33 in the gap between the lid portion 28B and the shielding plate 28D is closed, and a state in which the dust 30 can be satisfactorily discharged can be obtained. As a result, the cooling performance can be maintained without letting the cooling air escape to the outside, and the dischargeable state of the dust 30 can be stably maintained, and the dust 30 can be discharged efficiently.

  As described above, according to the dust collection device 24C according to the third embodiment, in addition to the same effects as the second embodiment, by providing the shielding plate 28D, the cooling efficiency can be improved. Also has the advantage of being able to prevent Therefore, when the dust collection device 24C according to the third embodiment is applied to the dump truck 1, for example, a strong wind is generated outside the vehicle body 2 while the alternator side cooling fan 21 is stopped, and the shielding plate 28D is Work as a dust cover. As a result, backflow of dust 30 into the alternator side ventilation duct 25 is prevented. Note that, instead of using the second elastic body 31 'as described in the third embodiment, for example, changing to an inlet shielding member of a seesaw structure having a mass difference as shown in FIGS. 6A and 6B. You can also.

  Incidentally, also in the dust collection device 24C according to the third embodiment, a filter is attached to the collection part 28A, or the mass W1 of the collection part 28A and the air intake part 28C and the mass W2 of the lid 28B. The relationship may be operated as W1 <W2.

  As described above, the dust collection devices 24A, 24B, and 24C described in the respective embodiments are provided in the specific region 26 of the alternator side ventilation duct 25 in which the centrifugal force acts on the cooling air. The dust 30 is collected by centrifugation while the alternator side cooling fan 21 is in operation, and the dust 30 is automatically discharged when stopped. As a result, the dust 30 can be collected and discharged only by the power of the cooling air without reducing the volume of the cooling air.

  In addition, the dust collection devices 24A, 24B, and 24C according to the respective embodiments are based on attaching a plate member and a hinge member, and can be simply configured to attach an elastic member. Thereby, the manufacturing process of dust collection apparatus 24A, 24B, 24C can be shortened, and a manufacturing cost can be reduced. Furthermore, since the dust 30 in the cooling air is automatically separated, collected and discharged, the dust collection devices 24A, 24B, 24C are maintenance-free and easy to use.

  The present invention is not limited to the embodiments disclosed in the above-described embodiment or each embodiment, and various modifications are possible without departing from the technical gist thereof, and the technical idea described in the claims is included. All of the technical matters involved are the subject of the present invention. Although the above-mentioned embodiment and each embodiment showed a suitable example, those skilled in the art can realize various modifications from the disclosed contents, but they are described in the appended claims. It is included in the technical scope. For example, although the seesaw members 29A, 29B, and 29C described in each embodiment have been described as a shape and mechanism that closes the dust collection inlet 33 when the alternator side cooling fan 21 stops, when discharging the dust 30 from the dust outlet 34 The case where it is good also as a shape or a mechanism which does not close the dust collection inlet 33 can be illustrated.

1 Dump truck (carrier vehicle)
Reference Signs List 2 vehicle body 10 engine 11 control cabinet 11A cooling air intake 11B cooling air outlet 14 rear axle housing 15 electric motor 16 cooling air supply device 17 electric motor side duct 18 alternator 19 alternator side duct 20 cooling air supply path 21 alternator side cooling fan 22 Electric motor side cooling fan 23 Assembly box (plenum box)
24, 24A, 24B, 24C Dust collector 25 Alternator side air duct 26 Specific area 27 Hinge (fulcrum)
27 'hinge (inlet shield)
28A collecting portion 28B lid portion 28C air receiving portion 28D shielding plate 29A, 29B seesaw member 30 dust 31 first elastic body 31 'second elastic body (inlet shielding member)
32 Flow of cooling air (cooling air) 33 Dust collection inlet (inlet)
34 Dust outlet (outlet)
35 entrance shield opening G guide part

Claims (4)

A transport vehicle comprising: a vehicle body; an engine mounted on the vehicle body; an alternator driven by the engine to generate electric power; and a cooling air supply device for supplying cooling air to the alternator.
The cooling air supply device includes a duct for flowing cooling air toward the alternator, a cooling fan provided in the duct for sucking in and discharging the cooling air, and dust contained in the cooling air provided in the duct. And a dust collecting device capable of discharging after collection.
The dust collection device is disposed on the inner wall of the duct far from the axial center of the cooling fan on which the centrifugal force of the cooling air in the duct acts, and is positioned inside the duct to take in the dust , An outlet located outside the duct for discharging the dust to the outside, a seesaw member provided between the inlet and the outlet and pivoted about a fulcrum, the inlet And extending from the duct to the outside of the duct, and guiding the dust from the inlet to the outlet,
The seesaw member is provided on one end side across the fulcrum, is provided on the other end side across the fulcrum with a lid portion for opening and closing the inlet, and opens and closes the outlet and is in contact with the guide portion. A collection portion forming a closed space with the guide portion, and a wind receiving portion extending from the lid portion to the inside of the duct;
The seesaw member is rotated when the air receiving portion is pressed by the cooling air pressure when the cooling fan operates, the inlet is opened, and the outlet is closed and the collecting portion is formed. It is characterized in that the dust can be collected in the closed space, it is turned when the cooling fan is stopped, the inlet is closed, and the outlet is opened to be able to discharge the dust. Transport vehicle. In the carrier vehicle according to claim 1,
The seesaw member has a shape having a mass difference with respect to the fulcrum, and is turned around the fulcrum due to the mass difference when the cooling fan is stopped, and the dust can be discharged. Transport vehicle. In the carrier vehicle according to claim 1,
The dust collection device is connected to the inner wall of the duct and the air receiving part, and holds the first elastic body capable of discharging the dust to the seesaw member when the cooling fan is not operating. Equipped
The first elastic body is characterized in that it is capable of collecting the dust when the cooling fan is in operation, and has an elastic force capable of holding the dust in a dischargeable state when the cooling fan is stopped. Transport vehicle. In the carrier vehicle according to claim 3,
The dust collection device includes an inlet shielding member that separately shields the inlet in a state where the dust can be discharged by the seesaw member,
The inlet shielding member shields the inlet by an elastic force of a second elastic body in a state where the seesaw member can discharge the dust when the cooling fan is not in operation.
The second elastic body is provided between the inlet shielding member and the guiding portion so as to press the inlet shielding member, receives the cooling air pressure when the cooling fan operates, and opens the inlet; A transport vehicle characterized by an elastic force capable of shielding the inlet when the cooling fan is stopped.

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