WO2023234091A1

WO2023234091A1 - Dump truck

Info

Publication number: WO2023234091A1
Application number: PCT/JP2023/018886
Authority: WO
Inventors: 晋中野
Original assignee: 株式会社小松製作所
Priority date: 2022-05-31
Filing date: 2023-05-22
Publication date: 2023-12-07
Also published as: JP2023176621A

Abstract

This dump truck comprises: drive wheels; a vehicle body which is supported on the drive wheels; a dump body which is supported on the vehicle body; an electric motor for rotating the drive wheels; and a first duct through which air supplied from the electric motor to an internal flow channel of the dump body flows.

Description

Dump truck

The present disclosure relates to a dump truck.

A dump truck includes a dump body on which cargo is loaded. When discharging the load from the dump body, the dump truck performs a dumping operation of the dump body. When a dump operation is performed, the load is ejected from the dump body under the action of gravity. If the load is wet due to moisture or oil content, and if the outside temperature is low, at least a portion of the load will remain attached to the inner surface of the dump body even if the dump operation is performed, and the dump It may not be excreted from the body. 2. Description of the Related Art Techniques for heating a dump body are known in order to prevent cargo from adhering to the inner surface of the dump body. Currently, a common technique is to heat the dump body using engine exhaust gas. By heating the dump body, freezing of the cargo or hardening of oil content is suppressed, and the cargo is dried. This prevents the cargo from adhering to the inner surface of the dump body. Patent Document 1 describes a resistor that converts electric power generated by a retarder brake operation into thermal energy, a cooling fan that cools this resistor, and a system that guides warm air blown from the cooling fan and warmed by the resistor. A dump truck having a duct is disclosed. In Patent Document 1, the loading platform (dump body) is heated by supplying warm air heated by a resistor to the loading platform (dump body).

JP2012-201227A

In the case of a dump truck without an engine, the dump body cannot be heated by engine exhaust. In addition, when heating the dump body with air warmed by the retarder brake (resistor), when the dump truck is running uphill or on a flat road, the retarder brake does not generate enough heat, so the dump body is heated from the retarder brake. It becomes difficult to supply high temperature air to the body. As a result, the dump body may not be sufficiently heated.

The present disclosure aims to heat a dump body with air heated by an electric motor.

According to the present disclosure, there is provided a drive wheel, a vehicle body supported by the drive wheel, a dump body supported by the vehicle body, an electric motor that rotates the drive wheel, and a flow path supplied from the electric motor to an internal flow path of the dump body. A dump truck is provided, comprising: a first duct through which air flows.

According to the present disclosure, the dump body is heated by air heated by the electric motor.

FIG. 1 is a side view showing a dump truck according to a first embodiment. FIG. 2 is a schematic diagram of the dump truck according to the first embodiment viewed from the rear. FIG. 3 is a side view showing the dump truck according to the first embodiment. FIG. 4 is a diagram showing the dump body according to the first embodiment. FIG. 5 is a side view showing the dump truck according to the first embodiment. FIG. 6 is a diagram showing the dump body according to the first embodiment. FIG. 7 is a schematic diagram of the dump truck according to the second embodiment viewed from the rear. FIG. 8 is a schematic diagram of the dump truck according to the third embodiment viewed from the rear. FIG. 9 is a side view showing a dump truck according to the fourth embodiment. FIG. 10 is a side view showing a dump truck according to the fourth embodiment. FIG. 11 is a diagram showing a dump body of a dump truck according to a fifth embodiment.

Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiments. The components of the embodiments described below can be combined as appropriate. Furthermore, some components may not be used.

[First embodiment]
A first embodiment will be described.

<Dump truck>
FIG. 1 is a side view showing a dump truck 1A according to the present embodiment. In this embodiment, the dump truck 1A is a rigid frame dump truck. Further, the dump truck 1A is an electrically driven dump truck. Dump truck 1A is not equipped with an engine. The dump truck 1A does not emit exhaust gas. The dump truck 1A has a storage battery or a fuel cell as a power source. Note that the dump truck 1A may be driven by power supplied from a contact wire.

As shown in FIG. 1, the dump truck 1A includes a vehicle body 2, front wheels 3, rear wheels 4, a dump body 5, a hoist cylinder 6, a retarder brake 7, and an electric motor 8.

The vehicle body 2 includes a chassis. The vehicle body 2 supports a dump body 5. A cab 9 is provided at the upper part of the front part of the vehicle body 2.

Each of the front wheels 3 and rear wheels 4 supports the vehicle body 2. The front wheels 3 are steered wheels. The rear wheels 4 are driving wheels. A tire 10 is attached to each of the front wheel 3 and the rear wheel 4. The dump truck 1A travels by rotating each of the front wheels 3 and the rear wheels 4.

The dump body 5 is loaded with cargo. An example of the load loaded on the dump body 5 is earth and sand. The dump body 5 is rotatably supported by the vehicle body 2.

The hoist cylinder 6 generates power to rotate the dump body 5. A lower end portion of the hoist cylinder 6 is connected to the vehicle body 2. The upper end of the hoist cylinder 6 is connected to the dump body 5.

The dump body 5 changes between a loading position and a standing position due to the expansion and contraction of the hoist cylinder 6. The loading position refers to a position in which the dump body 5 is lowered to approach the vehicle body 2 most closely within its movable range. The standing posture refers to a posture in which the dump body 5 is raised so as to be most distant from the vehicle body 2 within its movable range. A cargo is loaded onto the dump body 5 when the dump body 5 is in the loading attitude. The dump truck 1A travels when the dump body 5 is in the loading position. When the dump body 5 changes from the loading position to the standing position with the load loaded on the dump body 5, the load is discharged from the dump body 5 by the action of gravity. In this embodiment, the operation of changing the dump body 5 from the loading position to the standing position with a load loaded on the dump body 5 is appropriately referred to as a dumping operation.

By performing the dumping operation of the dump body 5, the load is discharged from the dump body 5. In this embodiment, the dumping operation of the dump body 5 includes an operation of rotating the dump body 5 backward. That is, in this embodiment, the dump body 5 discharges the cargo rearward using a rear dump method.

The retarder brake 7 is arranged at the rear of the cab 9. Retarder brake 7 is housed in brake housing 11 .

FIG. 2 is a schematic diagram of the dump truck 1A according to the embodiment viewed from the rear. The rear wheels 4 include a first rear wheel 4 disposed on the left side (one side) of the center of the vehicle body 2 in the left-right direction (vehicle width direction), and a second rear wheel disposed on the right side (other side). 4.

The electric motor 8 is connected to the rear wheel 4. The electric motor 8 rotates the rear wheel 4. A pair of electric motors 8 are provided. A pair of electric motors 8 are arranged in the left-right direction. The electric motor 8 includes a first electric motor 8 that rotates the left rear wheel 4 and a second electric motor 8 that rotates the right rear wheel 4. The left electric motor 8 is connected to the left rear wheel 4. The right electric motor 8 is connected to the right rear wheel 4.

The electric motor 8 is housed in a motor case 12. Electric motor 8 is housed in motor housing 13 via motor case 12 . The electric motor 8 is placed inside the motor housing 13 while being housed in the motor case 12 . The motor housing 13 is arranged between the left rear wheel 4 and the right rear wheel 4. The motor housing 13 functions as a rear axle case. Motor housing 13 is substantially cylindrical. The motor housing 13 houses the left electric motor 8 and the right electric motor 8, respectively.

The electric motor 8 has a stator 14, a rotor 15, and an output shaft 16. Stator 14 includes a stator core 14A and a coil 14B attached to stator core 14A. Stator 14 is fixed to motor case 12. Rotor 15 is arranged inside stator 14 . Output shaft 16 is fixed to rotor 15 . Rotor 15 and output shaft 16 rotate relative to stator 14 . One end of the output shaft 16 on the outside in the vehicle width direction is connected to the rear wheel 4 .

<Dump body>
FIG. 3 is a side view showing the dump truck 1A according to this embodiment. FIG. 4 is a diagram showing the dump body 5 according to this embodiment.

The dump body 5 includes a front plate 5F, a bottom plate 5B connected to the lower end of the front plate 5F, a left plate 5L connected to the left end of the front plate 5F and the left end of the bottom plate 5B, and the right end of the front plate 5F. and a right plate 5R connected to the right end of the bottom plate 5B, and a protector plate 5P connected to the upper end of the front plate 5F.

The front plate 5F, the bottom plate 5B, the left plate 5L, the right plate 5R, and the protector plate 5P are integrated. Each of the front plate 5F, the bottom plate 5B, the left plate 5L, the right plate 5R, and the protector plate 5P is formed of a steel material.

When the dump body 5 is in the loading position, the protector plate 5P is arranged above the cab 9. The rear end of the protector plate 5P and the upper end of the front plate 5F are connected. The lower end of the front plate 5F and the front end of the bottom plate 5B are connected.

The right plate 5R is arranged to the right of the center of the dump body 5 in the left-right direction, and is connected to the right end of the front plate 5F and the right end of the bottom plate 5B, respectively. The left plate 5L is arranged to the left of the center of the dump body 5 in the left-right direction, and is connected to the left end of the front plate 5F and the left end of the bottom plate 5B, respectively.

In the dump body 5, the loading space in which the cargo is loaded is defined between the rear surface of the front plate 5F, the upper surface of the bottom plate 5B, the right surface of the left plate 5L, and the left surface of the right plate 5R. The cargo contacts at least a portion of the rear surface of the front plate 5F, the upper surface of the bottom plate 5B, the right surface of the left plate 5L, and the left surface of the right plate 5R. In this embodiment, the rear surface of the front plate 5F of the dump body 5, the upper surface of the bottom plate 5B, the right surface of the left plate 5L, and the left surface of the right plate 5R, which are in contact with the cargo, are collectively referred to as the inner surface of the dump body 5.

The dump body 5 has a first inlet 17 into which air from the electric motor 8 flows, a second inlet 18 into which air from the retarder brake 7 flows, and at least the first inlet 17 and the second inlet 18. It has an internal flow path 19 through which air flows in from one side, and an outlet 20 through which the air that has flowed through the internal flow path 19 is discharged.

The first inlet 17 is provided on the lower surface of the bottom plate 5B. The first inlet 17 is provided at the center of the bottom plate 5B in the left-right direction. Note that the first inlet 17 may be provided at a position shifted to the left or right of the center portion of the bottom plate 5B in the left-right direction. The first inlet 17 is provided at the rear of the bottom plate 5B.

The second inlet 18 is provided on the front surface of the front plate 5F. The second inlet 18 is provided at the upper right part of the front surface of the front plate 5F. Note that the second inlet 18 may be provided at the upper left part of the front surface of the front plate 5F, or may be provided at the center.

The outflow port 20 is provided at the rear of the left surface of the left plate 5L. Note that the outlet 20 may be provided on the right plate 5R.

The internal flow path 19 is provided inside the dump body 5. The internal passage 19 includes a first passage 19A provided at the boundary between the bottom plate 5B and the right plate 5R, a second passage 19B provided at the boundary between the front plate 5F and the bottom plate 5B, and a second passage 19B provided at the boundary between the bottom plate 5B and the left plate 5R. It includes a third flow path 19C provided at the boundary with the plate 5L. At least a portion of the first flow path 19A is provided at the right end of the bottom plate 5B. At least a portion of the second flow path 19B is provided at the lower end of the front plate 5F. At least a portion of the third flow path 19C is provided at the lower end of the left plate 5L. The cargo tends to adhere to the above-mentioned boundary portion of the dump body 5. Therefore, the internal flow path 19 is provided at the boundary of the dump body 5. Note that the internal flow path 19 may be provided on a flat surface of the dump body 5.

The first flow path 19A, the second flow path 19B, and the third flow path 19C are connected to each other. The first inlet 17 is connected to the first flow path 19A. The second inlet 18 is connected to the second inlet 18 . Outlet 20 is connected to third flow path 19C.

<First duct and second duct>
The dump truck 1A includes a first duct 21 through which air is supplied from the electric motor 8 to the internal flow path 19 of the dump body 5. The first duct 21 is arranged to connect the motor housing 13 and the first inlet 17 of the internal flow path 19 . A lower end portion of the first duct 21 is connected to the center portion of the motor housing 13 in the left-right direction. Note that the lower end portion of the first duct 21 may be connected to the left or right portion of the motor housing 13. The upper end of the first duct 21 is connected to the first inlet 17 .

The dump truck 1A includes a second duct 22 through which air is supplied from the retarder brake 7 to the internal flow path 19 of the dump body 5. The second duct 22 is arranged to connect the brake housing 11 and the second inlet 18 of the internal flow path 19 . When the dump body 5 is in the loading position, the second duct 22 and the second inlet 18 are connected. When the dump body 5 is in the upright position, the second duct 22 and the second inlet 18 are disconnected.

<Air flow>
As indicated by arrows in FIGS. 3 and 4, air around the electric motor 8 is supplied to the first inlet 17 via the first duct 21. The air that has flowed into the internal channel 19 of the dump body 5 from the first inlet 17 flows through the internal channel 19 and is then discharged from the outlet 20 . For example, when the dump truck 1A travels uphill (uphill road) or on a flat road, the electric motor 8 is driven, and as a result, the electric motor 8 generates heat. Air heated by the electric motor 8 is supplied to the internal flow path 19, thereby heating the dump body 5.

FIG. 5 is a side view showing the dump truck 1A according to the present embodiment. FIG. 6 is a diagram showing the dump body 5 according to this embodiment. As indicated by arrows in FIGS. 5 and 6, air around the retarder brake 7 is supplied to the second inlet 18 via the second duct 22. The air that has flowed into the internal channel 19 of the dump body 5 from the second inlet 18 flows through the internal channel 19 and is then discharged from the outlet 20 . For example, when the dump truck 1A travels downhill (downhill road), the retarder brake 7 is activated, and as a result, the retarder brake 7 generates heat. Air heated by the retarder brake 7 is supplied to the internal flow path 19, thereby heating the dump body 5.

In this embodiment, air is supplied from the electric motor 8 to the internal flow path 19 and air is supplied from the retarder brake 7 to the internal flow path 19 when the dump truck 1A is traveling uphill or on a flat road and when traveling downhill. The air supply may also be switched. Air may be supplied from the electric motor 8 to the internal passage 19 when traveling uphill or on a flat road, and air may be supplied from the retarder brake 7 to the internal passage 19 when traveling downhill. As a result, the dump body 5 is always heated during uphill travel, flat road travel, and downhill travel.

Note that if the on-board controller of the dump truck 1A cannot determine whether the dump truck 1A is traveling on an uphill road, a flat road, or a downhill road, the on-board controller controls the operation of each of the electric motor 8 and retarder brake 7. The situation may be detected and the supply of air from the electric motor 8 to the internal passage 19 and the supply of air from the retarder brake 7 to the internal passage 19 may be switched based on the detected operating status. Further, when a first temperature sensor that detects the temperature around the electric motor 8 and a second temperature sensor that detects the temperature around the retarder brake 7 are provided, the on-vehicle controller detects the detected value of the first temperature sensor. When the temperature is greater than or equal to the first predetermined value, air is supplied from the electric motor 8 to the internal flow path 19, and when the detected value of the second temperature sensor is greater than or equal to the second predetermined value, air is supplied from the retarder brake 7 to the internal flow path 19. may also be controlled so that it is supplied.

<Effect>
As explained above, in the present embodiment, the dump truck 1A includes the rear wheels 4 as driving wheels, the vehicle body 2 supported by the rear wheels 4, the dump body 5 supported by the vehicle body 2, and the rear wheels 4. The dump body 5 includes an electric motor 8 that rotates the dump body 5, and a first duct 21 through which air supplied from the electric motor 8 to the internal flow path 19 of the dump body 5 flows. Air heated by the electric motor 8 is supplied to the internal flow path 19 of the dump body 5 via the first duct 21, so the dump body 5 is heated. Therefore, adhesion of cargo to the inner surface of the dump body 5 is suppressed. In particular, when the dump truck 1A travels uphill or on a flat road, the amount of heat generated by the electric motor 8 increases, so the dump body 5 is effectively heated.

The dump truck 1A includes a motor housing 13 that houses the electric motor 8. The first duct 21 is arranged to connect the motor housing 13 and the first inlet 17 of the internal flow path 19 . Since the electric motor 8 is housed in the motor housing 13, air heated by the electric motor 8 is efficiently supplied to the internal flow path 19.

The motor housing 13 accommodates the left electric motor 8 and the right electric motor 8, respectively. The first duct 21 is connected to the center of the motor housing 13 in the left-right direction. Thereby, each of the air heated by the left electric motor 8 and the air heated by the right electric motor 8 is efficiently supplied to the internal flow path 19.

The first inlet 17 is provided on the bottom plate 5B of the dump body 5. This prevents the first duct 21 from becoming longer.

The dump truck 1A includes a retarder brake 7 and a second duct 22 through which air is supplied from the retarder brake 7 to the internal flow path 19 of the dump body 5. The air heated by the retarder brake 7 is supplied to the internal flow path 19 of the dump body 5 via the second duct 22, so the dump body 5 is heated. Therefore, adhesion of cargo to the inner surface of the dump body 5 is suppressed. In particular, when the dump truck 1A travels downhill, the amount of heat generated by the retarder brake 7 increases, so the dump body 5 is effectively heated.

The dump truck 1A includes a brake housing 11 that accommodates the retarder brake 7. The second duct 22 is arranged to connect the brake housing 11 and the second inlet 18 of the internal flow path 19 . Since the retarder brake 7 is housed in the brake housing 11, air heated by the retarder brake 7 is efficiently supplied to the internal flow path 19.

The second inlet 18 is provided on the front plate 5F of the dump body 5. This prevents the second duct 22 from becoming longer.

[Second embodiment]
A second embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 7 is a schematic diagram of the dump truck 1B according to the present embodiment viewed from the rear. As shown in FIG. 7, the dump truck 1B includes a blower fan 23 arranged inside the motor housing 13. The blower fan 23 rotates so that air is supplied from the electric motor 8 to the internal flow path 19 of the dump body 5. The blower fan 23 is rotated by the electric motor 8. In this embodiment, the blower fan 23 is connected to the output shaft 16. The rotation of the output shaft 16 causes the blower fan 23 to rotate.

The blower fan 23 is arranged at a position closer to the center of the motor housing 13 than the electric motor 8 in the left-right direction. That is, the blower fan 23 is arranged at a position closer to the first duct 21 than the electric motor 8. The blower fan 23 is connected to the other end of the output shaft 16 near the center of the motor housing 13 in the left-right direction. Similar to the embodiments described above, one end of the output shaft 16 is connected to the rear wheel 4.

The blower fan 23 is connected to each of the electric motor 8 on the left side and the electric motor 8 on the right side. The blower fan 23 includes a first blower fan 23 rotated by the electric motor 8 on the left side and a second blower fan 23 rotated by the electric motor 8 on the right side.

As explained above, in this embodiment, the dump truck 1B includes the blower fan 23 arranged inside the motor housing 13. The blower fan 23 rotates so that air is supplied from the electric motor 8 to the internal flow path 19 of the dump body 5. Thereby, air heated by the electric motor 8 is efficiently supplied to the internal flow path 19 via the first duct 21.

[Third embodiment]
A third embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 8 is a schematic diagram of the dump truck 1C according to the present embodiment viewed from the rear. As shown in FIG. 8, the dump truck 1C includes a blower fan 24 arranged inside the first duct 21. The blower fan 24 rotates so that air is supplied from the electric motor 8 to the internal flow path 19 of the dump body 5. The blower fan 24 is rotated by a motor (not shown) that is different from the electric motor 8.

The blower fan 24 rotates so that air is supplied from the electric motor 8 to the internal flow path 19 of the dump body 5 when the dump truck 1C is traveling uphill or on a flat road, and when the dump truck 1C is traveling downhill. It does not rotate. This is because the electric motor 8 is driven and generates heat when the dump truck 1C is traveling uphill or on a flat road, but the electric motor 8 is not driven when the dump truck 1C is traveling downhill. Note that the blower fan 24 may rotate when the temperature of the electric motor 8 is equal to or higher than a first predetermined value, and may not rotate when the temperature of the electric motor 8 is less than the first predetermined value. For example, in the case where a first temperature sensor (not shown) is provided to detect the temperature around the electric motor 8, the blower fan 24 rotates when the detected value of the first temperature sensor is equal to or higher than a first predetermined value. It is not necessary to rotate when the detected value of the sensor is less than the first predetermined value.

As explained above, in this embodiment, the dump truck 1C includes the blower fan 24 arranged inside the first duct 21. The blower fan 24 rotates so that air is supplied from the electric motor 8 to the internal flow path 19 of the dump body 5. Thereby, air heated by the electric motor 8 is efficiently supplied to the internal flow path 19 via the first duct 21.

Note that a retarder fan may be provided that rotates so that air is supplied from the retarder brake 7 to the internal flow path 19 of the dump body 5. The retarder fan may be placed inside the brake housing 11. The retarder fan rotates so that air is supplied from the retarder brake 7 to the internal flow path 19 of the dump body 5 when the dump truck 1C is traveling downhill, and when the dump truck 1C is traveling uphill or on a flat road. It doesn't have to rotate. This is because when the dump truck 1C runs downhill, the retarder brake 7 operates and generates heat, but when the dump truck 1C runs uphill or on a flat road, the retarder brake 7 does not operate. Note that the retarder fan may rotate when the temperature of the retarder brake 7 is equal to or higher than a second predetermined value, and may not rotate when the temperature of the retarder brake 7 is less than the second predetermined value. For example, if a second temperature sensor (not shown) is provided that detects the temperature around the retarder brake 7, the retarder fan rotates when the detected value of the second temperature sensor is equal to or higher than a second predetermined value, and the second temperature sensor It is not necessary to rotate when the detected value of is less than the second predetermined value.

[Fourth embodiment]
A fourth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

Each of FIGS. 9 and 10 is a side view showing the dump truck 1D according to the present embodiment. The dump truck 1D includes an exhaust duct 25 connected to the first duct 21, a first valve 27 that opens and closes the flow path of the first duct 21, and a second valve 28 that opens and closes the flow path of the exhaust duct 25. Be prepared. The exhaust duct 25 is arranged to branch from the first valve 27 between the motor housing 13 and the first inlet 17. One end of the exhaust duct 25 is connected to the first valve 27 . An outlet 26 is provided at the other end of the exhaust duct 25.

Air is supplied from the electric motor 8 to the internal passage 19 and from the retarder brake 7 to the internal passage 19 when the dump truck 1D is traveling uphill or on a flat road and when traveling downhill. Can be switched. When traveling uphill or on a flat road, air is supplied from the electric motor 8 to the internal flow path 19, and when traveling downhill, air is supplied from the retarder brake 7 to the internal flow path 19.

FIG. 9 shows the states of the first valve 27 and the second valve 28 when the dump truck 1D travels uphill or on a flat road. As shown in FIG. 9, the first valve 27 opens the flow path of the first duct 21 when traveling uphill or on a flat road. The second valve 28 closes the flow path of the exhaust duct 25 when traveling uphill or on a flat road. Air supplied from the electric motor 8 to the internal flow path 19 is discharged from the outlet 20. In this way, air is supplied from the electric motor 8 to the internal flow path 19 when traveling uphill or on a flat road.

FIG. 10 shows the states of the first valve 27 and the second valve 28 when the dump truck 1D travels downhill. As shown in FIG. 10, the first valve 27 closes the flow path of the first duct 21 when traveling downhill. The second valve 28 opens the flow path of the exhaust duct 25 when traveling downhill. As a result, air is supplied from the retarder brake 7 to the internal flow path 19 when traveling downhill. The air supplied from the retarder brake 7 to the internal flow path 19 is not supplied to the electric motor 8 but is discharged from the outlet 20. In this way, air is supplied from the retarder brake 7 to the internal flow path 19 when traveling downhill. Air from the electric motor 8 is not supplied to the internal flow path 19, but is discharged around the dump truck 1D via the exhaust duct 25.

As explained above, in this embodiment, the dump truck 1D includes the first valve 27 that opens and closes the flow path of the first duct 21. When the dump truck 1D travels uphill or on a flat road, the flow path of the first duct 21 is opened, so that air heated by the electric motor 8 is supplied to the internal flow path 19. When the dump truck 1D travels downhill, air heated by the retarder brake 7 is supplied to the internal flow path 19 by closing the flow path of the first duct 21. As a result, the dump body 5 is always heated during uphill travel, flat road travel, and downhill travel.

The dump truck 1D includes an exhaust duct 25 that branches from the first duct 21, and a second valve 28 that opens and closes the flow path of the exhaust duct 25. When the flow path of the first duct 21 is opened when the dump truck 1D is traveling uphill or on a flat road, the flow path of the exhaust duct 25 is closed. Thereby, the air heated by the electric motor 8 is efficiently supplied to the internal flow path 19. When the flow path of the first duct 21 is closed when the dump truck 1D travels downhill, the flow path of the exhaust duct 25 is opened. As a result, air from the electric motor 8 is discharged to the surroundings of the dump truck 1D via the exhaust duct 25.

Note that in this embodiment, when the dump truck 1D travels downhill, the electric motor 8 does not operate, and the blower fan 23 and the blower fan 24 also do not operate. That is, when the dump truck 1D travels downhill, air is not supplied from the electric motor 8 to the internal flow path 19 of the dump body 5. Therefore, the exhaust duct 25 may be omitted.

[Fifth embodiment]
A fifth embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 11 is a diagram showing the dump body 5 of the dump truck 1E according to the present embodiment. Similar to the embodiment described above, the dump body 5 includes a bottom plate 5B, a left plate 5L, a right plate 5R, a front plate 5F, and a protector plate 5P.

In this embodiment, the internal flow path of the dump body 5 includes a first internal flow path 191 and a second internal flow path 192 partitioned off from the first internal flow path 191. The first internal flow path 191 and the second internal flow path 192 do not intersect. The first internal flow path 191 and the second internal flow path 192 are separate internal flow paths. Air flowing through the first internal flow path 191 is not supplied to the second internal flow path 192 . Air flowing through the second internal flow path 192 is not supplied to the first internal flow path 191 .

The first duct 21 is connected to the first inlet 170 of the first internal flow path 191. Air from the electric motor 8 is supplied to the first inlet 170 via the first duct 21. The air that has flowed into the first inlet 170 flows through the first internal channel 191 and is then discharged from the outlet 201 of the first internal channel 191 . The first inlet 170 is provided at the center of the lower surface of the bottom plate 5B in the left-right direction. The first inlet 170 is provided at the rear of the bottom plate 5B. The outflow port 201 is provided at the front part of the right side of the right plate 5R.

The second duct 22 is connected to the second inlet 180 of the second internal flow path 192. Air from the retarder brake 7 is supplied to the second inlet 180 via the second duct 22. The air that has entered the second inlet 180 flows through the second internal channel 192 and is then discharged from the outlet 200 of the second internal channel 192 . The second inlet 180 is provided on the front surface of the front plate 5F. The second inlet 180 is provided at the upper right part of the front surface of the front plate 5F. The outlet 200 is provided at the rear of the left surface of the left plate 5L.

At least a portion of the first internal flow path 191 is provided at the center of the bottom plate 5B in the left-right direction (vehicle width direction). The second internal flow path 192 is provided at each of the boundary between the bottom plate 5B and the front plate 5F, the boundary between the bottom plate 5B and the left plate 5L, and the boundary between the bottom plate 5B and the right plate 5R.

In this embodiment, the first internal flow path 191 includes a first flow path 191A provided inside the bottom plate 5B, and a second flow path 191B and a third flow path 191C provided inside the front plate 5F. The first flow path 191A is provided at the center of the bottom plate 5B in the left-right direction. In this embodiment, the first flow path 191A is provided so as to extend in the front-rear direction. Two first channels 191A are provided at intervals in the left-right direction. The second flow path 191B is provided at the center of the front plate 5F in the left-right direction. In this embodiment, the second flow path 191B is provided so as to extend in the vertical direction. Two second flow paths 191B are provided at intervals in the left-right direction. The front end of the first flow path 191A on the left side and the lower end of the second flow path 191B on the left side are connected. The front end of the first flow path 191A on the right side and the lower end of the second flow path 191B on the right side are connected. The third flow path 191C is provided so as to extend in the left-right direction. The upper end portion of the second flow path 191B on the left side and the upper end portion of the second flow path 191B on the right side are each connected to the third flow path 191C. The right end of the third flow path 191C is connected to the outlet 201. Air from the first inlet 170 flows into the rear end of the first flow path 191A on the left and the rear end of the first flow path 191A on the right. The air that has flowed into the first flow path 191A flows through the first flow path 191A, the second flow path 191B, and the third flow path 191C, and then is discharged from the outlet 201.

In this embodiment, the second internal flow path 192 includes a fourth flow path 192B provided inside the front plate 5F, a fifth flow path 192A provided inside the right plate 5R, and a fifth flow path 192A provided inside the left plate 5L. and a sixth flow path 192C. The fourth flow path 192B is connected to the second inlet 180. At least a portion of the fourth flow path 192B is provided at the lower end of the front plate 5F. At least a portion of the fourth flow path 192B is provided at the boundary between the bottom plate 5B and the front plate 5F. At least a portion of the fifth flow path 192A is provided at the lower end of the right plate 5R. At least a portion of the fifth flow path 192A is provided at the boundary between the bottom plate 5B and the right plate 5R. At least a portion of the sixth flow path 192C is provided at the lower end of the left plate 5L. At least a portion of the sixth flow path 192C is provided at the boundary between the bottom plate 5B and the left plate 5L. The fourth flow path 192B, the fifth flow path 192A, and the sixth flow path 192C are interconnected. The air that has flowed into the fourth channel 192B from the second inlet 180 is discharged from the outlet 201 after flowing through each of the fifth channel 192A and the sixth channel 192C.

As explained above, in this embodiment, air from the electric motor 8 flows through the first internal flow path 191, and air from the retarder brake 7 flows through the second internal flow path different from the first internal flow path 191. It flows along road 192. As a result, when the dump truck 1E is traveling uphill or on a flat road, the dump body 5 is effectively heated by the air flowing through the first internal flow path 191, and when the dump truck 1E is traveling downhill, the dump body 5 is effectively heated. The dump body 5 is effectively heated by the air flowing through the second internal flow path 192. Further, since the first internal flow path 191 and the second internal flow path 192 are partitioned, air from the electric motor 8 is suppressed from being supplied to the retarder brake 7, and air from the retarder brake 7 is Supply to the motor 8 is suppressed.

In this embodiment, at least a portion of the second internal flow path 192 includes the boundary between the bottom plate 5B and the front plate 5F, the boundary between the bottom plate 5B and the left plate 5L, and the boundary between the bottom plate 5B and the right plate 5R. provided for each. The cargo is located on the inner surface of the dump body 5 at the boundary (corner) between the top surface of the bottom plate 5B and the rear surface of the front plate 5F, the boundary (corner) between the top surface of the bottom plate 5B and the right surface of the left plate 5L, and the bottom plate. It tends to adhere to the boundary (corner) between the top surface of the right plate 5B and the left surface of the right plate 5R. Furthermore, the air from the retarder brake 7 is likely to have a higher temperature than the air from the electric motor 8. Since high temperature air is supplied to each of the boundary between the bottom plate 5B and the front plate 5F, the boundary between the bottom plate 5B and the left plate 5L, and the boundary between the bottom plate 5B and the right plate 5R, the dump body 5 The adhesion of cargo to the inner surface of the container is effectively suppressed.

[Other embodiments]
In the embodiment described above, the rear wheels 4 are the driving wheels. The front wheel 3 may be a driving wheel, or each of the front wheel 3 and the rear wheel 4 may be a driving wheel. Further, the rear wheels 4 may be steered.

In the above-described embodiment, the dump truck (1A, etc.) is of a rigid frame type. The dump truck (1A etc.) may be of an articulated type.

In the above-described embodiment, the dump truck (1A, etc.) is of the rear dump type. The dump truck (such as 1A) may be of a side dump type in which the load is discharged from the dump body 5 by tilting the dump body 5 to the left or right.

1A...Dump truck, 1B...Dump truck, 1C...Dump truck, 1D...Dump truck, 1E...Dump truck, 2...Vehicle body, 3...Front wheel, 4...Rear wheel (drive wheel), 5...Dump body, 5F...Front Plate, 5B...bottom plate, 5L...left plate, 5R...right plate, 5P...protector plate, 6...hoist cylinder, 7...retarder brake, 8...electric motor, 9...cab, 10...tire, 11...brake housing, 12 ...Motor case, 13...Motor housing, 14...Stator, 14A...Stator core, 14B...Coil, 15...Rotor, 16...Output shaft, 17...First inlet, 18...Second inlet, 19...Internal flow path, 19A...first channel, 19B...second channel, 19C...third channel, 20...outlet, 21...first duct, 22...second duct, 23...blow fan, 24...blow fan, 25... Exhaust duct, 26... Outlet, 27... First valve, 28... Second valve, 170... First inlet, 180... Second inlet, 191... First internal channel, 191A... First channel, 191B ...Second channel, 191C...Third channel, 192...Second internal channel, 192A...Fifth channel, 192B...Fourth channel, 192C...Sixth channel, 200...Outlet, 201...Flow Exit.

Claims

a driving wheel;
a vehicle body supported by the drive wheels;
a dump body supported by the vehicle body;
an electric motor that rotates the drive wheel;
a first duct through which air is supplied from the electric motor to the internal flow path of the dump body;
Dump truck.
a motor housing that accommodates the electric motor;
the first duct is arranged to connect the motor housing and the first inlet of the internal flow path;
The dump truck according to claim 1.
The drive wheels include a first drive wheel disposed on one side of the center of the vehicle body in the vehicle width direction, and a second drive wheel disposed on the other side,
The electric motor includes a first electric motor that rotates the first drive wheel, and a second electric motor that rotates the second drive wheel,
The motor housing accommodates the first electric motor and the second electric motor,
The first duct is connected to a central portion of the motor housing in the vehicle width direction.
The dump truck according to claim 2.
The first inlet is provided in the bottom plate of the dump body.
The dump truck according to claim 2.
comprising a blower fan disposed inside the first duct;
The dump truck according to claim 3.
comprising a blower fan disposed inside the motor housing;
The dump truck according to claim 3.
The blower fan is rotated by the electric motor.
The dump truck according to claim 5.
The blower fan includes a first blower fan rotated by the first electric motor and a second blower fan rotated by the second electric motor.
The dump truck according to claim 7.
retarder brake,
a second duct through which air is supplied from the retarder brake to the internal flow path of the dump body;
The dump truck according to claim 1.
a brake housing that accommodates the retarder brake;
The second duct is arranged to connect the brake housing and the second inlet of the internal flow path.
The dump truck according to claim 9.
The second inlet is provided in the front plate of the dump body,
The dump truck according to claim 10.
comprising a first valve that opens and closes the flow path of the first duct;
The first valve opens the flow path of the first duct when traveling uphill or on a flat road, and closes the flow path of the first duct when traveling downhill.
The dump truck according to claim 9.
an exhaust duct connected to the first duct;
a second valve that opens and closes the flow path of the exhaust duct;
The second valve closes the flow path of the exhaust duct when traveling uphill or on a flat road, and opens the flow path of the second duct when traveling downhill.
The dump truck according to claim 12.
a blower fan that rotates so that air is supplied from the electric motor to the internal flow path of the dump body when traveling uphill or on a flat road;
a retarder fan that rotates so that air is supplied from the retarder brake to the internal flow path of the dump body when traveling downhill;
The dump truck according to claim 9.
a blower fan that rotates so that air is supplied from the electric motor to the internal flow path of the dump body;
a retarder fan that rotates so that air is supplied from the retarder brake to the internal flow path of the dump body when traveling downhill;
a first temperature sensor that detects the temperature around the electric motor;
a second temperature sensor that measures the temperature around the retarder brake;
When the detected value of the first temperature sensor is greater than or equal to a first predetermined value, the blower fan rotates;
When the detected value of the second temperature sensor is equal to or higher than a second predetermined value, the retarder fan rotates;
The dump truck according to claim 9.
The internal flow path of the dump body includes a first internal flow path and a second internal flow path partitioned off from the first internal flow path,
the first duct is connected to a first inlet of the first internal flow path,
the second duct is connected to a second inlet of the second internal flow path;
The dump truck according to claim 9.
The dump body includes a bottom plate, a front plate, a left plate, and a right plate,
At least a portion of the first internal flow path is provided at a central portion of the bottom plate in the vehicle width direction,
The second internal flow path is provided at each of the boundary between the bottom plate and the front plate, the boundary between the bottom plate and the left plate, and the boundary between the bottom plate and the right plate.
The dump truck according to claim 16.
The supply of air from the electric motor to the internal flow path and the supply of air from the retarder brake to the internal flow path are switched between when traveling uphill and when traveling downhill,
When traveling uphill, air is supplied from the electric motor to the internal flow path,
Air is supplied from the retarder brake to the internal flow path when traveling downhill;
The dump truck according to claim 9.
a driving wheel;
a vehicle body supported by the drive wheels;
a dump body supported by the vehicle body;
an electric motor that rotates the drive wheel;
a first duct through which air is supplied from the electric motor to the internal flow path of the dump body;
a blower fan that rotates so that air is supplied from the electric motor to the internal flow path of the dump body;
a first temperature sensor that detects the temperature around the electric motor;
When the detected value of the first temperature sensor is equal to or higher than a first predetermined value, the blower fan rotates;
Dump truck.