Disaster prevention vehicles

Abstract

To provide a disaster prevention vehicle that allows a fire pump driven by the power taken out from a travelling engine by a power take-out device, and arranged under the floor of a load box to be arranged in a well-balanced manner, and allows a change in the layout to be made easily.SOLUTION: A disaster prevention vehicle includes: a sub-frame 3 attached on a chassis frame 2; a load box 6 attached to the sub-frame 3; and a fire pump 8 driven by the power taken out from a travelling engine 5 by a power take-out device 10, and arranged under the floor of the load box 6 in the rear part of the vehicle. The fire pump 8 includes: an impeller; an impeller rotation shaft for rotating the impeller; a power input shaft to which rotation power from the power take-out device 10 on a vehicle front side is input through a drive shaft 11; and a transmission mechanism for transmitting the rotation power input to the power input shaft to the impeller rotation shaft while separating the shaft center of the impeller rotation shaft and the shaft center of the power input shaft in parallel.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD

[0001] The present invention relates to a disaster prevention vehicle equipped with a cargo box and a fire pump for performing rescue operations and fire extinguishing operations. BACKGROUND ART

[0002] Conventionally, there are disaster prevention vehicles that are dispatched for rescue operations and fire extinguishing operations when a disaster such as a fire, earthquake disaster, or accident occurs. Some disaster prevention vehicles are equipped with both a fire pump for performing fire extinguishing operations and a storage space for storing equipment for performing rescue operations. Examples of such a disaster prevention vehicle include the vehicle disclosed in Patent Document 1 (referred to as "fire vehicle" in the same document). The disaster prevention vehicle disclosed in Patent Document 1 includes a subframe mounted on a chassis frame, a cargo box mounted on the subframe, and a fire pump driven by power extracted from a travel engine by a power take-off device. A water tank and a storage space are provided on the floor inside the cargo box. Fire extinguishing water is stored in the water tank. In addition, equipment is stored in the storage space.

[0003] Further, in the disaster prevention vehicle of Patent Document 1, the fire pump is disposed at the rear of the vehicle and below the storage space. This fire pump is connected to the power take-off device at the front of the vehicle by a drive shaft. The drive shaft is disposed below the water tank and the storage space. The drive shaft is configured using a plurality of drive shafts connected to each other via joint members. PRIOR ART DOCUMENTS PATENT DOCUMENTS

[0004] PATENT DOCUMENT 1 Japanese Unexamined Patent Application Publication No. 2023-32513 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0005] Conventional disaster prevention vehicles, such as those described in Patent Document 1, have faced challenges in adding equipment to accommodate both rescue and firefighting operations. Specifically, when attempting to add equipment while maintaining storage space, the presence of a water tank on the cargo box floor makes it difficult to add equipment there. Therefore, the idea of ​​adding equipment under the cargo box floor arises, but this requires avoiding interference between the drive shaft and the fire pump.

[0006] However, conventionally, the drive shaft was connected to the drive shaft connection point of a fire pump, and this drive shaft connection point was located on the extension of the impeller rotation axis that rotates the fire pump's impeller. Because there is a limit to the connection angle of the drive shaft to the drive shaft connection point, when attempting to add equipment near the fire pump, the layout of the fire pump was limited to accommodate the addition.

[0007] This invention has been made in consideration of the above circumstances, and its purpose is to provide a disaster prevention vehicle in which a fire pump, which is driven by power extracted from the driving engine by a power extraction device and is located under the floor of the cargo box, can be positioned in a balanced manner and the layout can be easily changed. [Means for solving the problem]

[0008] To solve the above-mentioned problems, the invention disclosed herein is configured as follows. That is, the first invention is a disaster prevention vehicle comprising a subframe mounted on a chassis frame, a cargo box mounted on the subframe, and a fire pump driven by power taken out from a driving engine by a power take-out device and located at the rear of the vehicle and under the floor of the cargo box, wherein the fire pump comprises an impeller, an impeller rotation shaft for rotating the impeller, a power input shaft to which rotational power from the power take-out device on the front side of the vehicle is input via a drive shaft, and a transmission mechanism that transmits the rotational power input to the power input shaft to the impeller rotation shaft while spacing the axis of the impeller rotation shaft and the axis of the power input shaft parallel to each other.

[0009] According to the first invention, rotational power from a power extraction device is input to a power input shaft via a drive shaft. The axis of the power input shaft is spaced parallel to the axis of the impeller rotation shaft that rotates the impeller of the fire pump. The rotational power input to the power input shaft is transmitted to the impeller rotation shaft by a transmission mechanism. This eliminates the need to position the drive shaft connection point to the fire pump on the extension of the impeller rotation shaft. Furthermore, while appropriately maintaining the connection angle of the drive shaft to the drive shaft connection point on the power input shaft, the position of the impeller and its casing can be shifted up, down, left, and right relative to the drive shaft connection point. This allows for a well-balanced arrangement of additional equipment and the fire pump when adding equipment near the fire pump under the floor of the cargo box. In addition, equipment can be added more flexibly than before, and the layout of the fire pump can be easily changed at that time. Since equipment can be easily added under the floor of the cargo box, the storage space for equipment on the floor of the cargo box can be maintained as before.

[0010] The second invention is characterized in that, in the first invention, a vacuum pump is attached to the transmission mechanism casing to which the transmission mechanism is attached for exhausting the internal air and filling it with priming water when the fire pump is started, and the transmission mechanism is configured to transmit the rotational power input to the power input shaft to the pump rotation shaft for providing rotational driving force to the vacuum pump.

[0011] According to the second invention, the fire pump and the vacuum pump can be integrated by attaching the vacuum pump to the transmission mechanism casing. Furthermore, since the transmission mechanism is configured to transmit the rotational power input to the power input shaft to the pump rotation shaft that provides rotational driving force to the vacuum pump, the power source for the vacuum pump and the power source for the fire pump can be combined into one. As a result, the space required for the fire pump and the vacuum pump can be reduced, making it easy to add equipment near the fire pump.

[0012] The third invention is characterized in that, in the second invention, the axis of the impeller rotation shaft and the axis of the pump rotation shaft are arranged to be parallel and spaced apart, the power input shaft is positioned above the impeller rotation shaft, and the pump rotation shaft is positioned to the side of the impeller rotation shaft.

[0013] According to the third invention, the power input shaft is positioned above the impeller rotation shaft. This allows power from the drive engine to be transmitted to the impeller rotation shaft while appropriately maintaining the connection angle of the drive shaft to the drive shaft connection on the power input shaft, even when the power outlet of the power extraction device is located above the chassis frame and the height of the fire pump's impeller rotation shaft is located above or below the chassis frame. Furthermore, since the pump rotation shaft of the vacuum pump is positioned to the side of the impeller rotation shaft, it is possible to prevent the fire pump and vacuum pump from protruding significantly below the chassis frame. This allows for a fire pump configuration that ensures sufficient clearance with the road surface.

[0014] The fourth invention is characterized in that, in the third invention, the transmission mechanism casing is provided with a first mounting portion on one side in the vehicle width direction for mounting the vacuum pump and a second mounting portion on the other side in the vehicle width direction, and the second mounting portion is attached to a pump support frame for supporting the fire pump in a hanging manner from the subframe.

[0015] According to the fourth invention, the pump support frame allows the fire pump and vacuum pump to be easily positioned under the floor of the cargo box. Furthermore, since the fire pump is attached to the pump support frame from one side in the vehicle width direction, the fire pump can be positioned with the vertical distance between the cargo box floor and the fire pump as small as possible. This prevents the fire pump from protruding significantly below the chassis frame, even if the vertical dimensions of the fire pump are large. As a result, the fire pump can be positioned with sufficient clearance from the road surface.

[0016] The fifth invention is characterized in that, in any one of the second to fourth inventions, the vehicle comprises a water tank supply pipe for supplying fire extinguishing water sucked up from outside the vehicle by the drive of the fire pump to a water tank inside the cargo box, and a water tank suction pipe for supplying the fire extinguishing water stored in the water tank to the fire pump for discharge, wherein the water tank supply pipe is arranged on one side in the vehicle width direction of the fire pump so as to partially overlap with the fire pump when viewed from the side of the vehicle, while the water tank suction pipe is arranged on the other side in the vehicle width direction of the fire pump so as to partially overlap with the fire pump when viewed from the side of the vehicle.

[0017] According to the fifth invention, the water supply piping and water intake piping for the water tank can be kept as far away from the floor of the cargo box as possible, thereby securing storage space for equipment, and the weight balance and drive balance of the fire pump in the vehicle width direction can be made appropriate. [Effects of the Invention]

[0018] According to the disaster prevention vehicle of the present invention, the fire pump, which is driven by power taken out from the traveling engine by a power take-off device and arranged under the floor of the cargo box, can be arranged in a well-balanced manner and layout changes can be easily performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] [Figure 1] It is a side view of a disaster prevention vehicle according to an embodiment of the present invention. [Figure 2] It is a principal part side view for explaining the layout of the fire pump mounted on the disaster prevention vehicle of the present embodiment and its surroundings. [Figure 3] It is a principal part plan view for explaining the layout of the fire pump mounted on the disaster prevention vehicle of the present embodiment and its surroundings. [Figure 4] It is an enlarged plan view of the principal part of Figure 3. [Figure 5] It is a simplified front view of the winch device mounted on the disaster prevention vehicle of the present embodiment, viewed from the front side of the vehicle. [Figure 6] It is a front view of the fire pump of the present embodiment, viewed from the front side of the vehicle. [Figure 7] It is a schematic diagram for explaining the transmission mechanism of the fire pump of the present embodiment. [Figure 8] It is a piping system diagram of the disaster prevention vehicle of the present embodiment. [Figure 9] It is a principal part plan view showing the piping layout of the disaster prevention vehicle of the present embodiment. [Figure 10] It is a principal part side view showing the layout of the water tank water suction pipe in the disaster prevention vehicle of the present embodiment. [Figure 11] It is a principal part side view showing the layout of the water tank water supply pipe in the disaster prevention vehicle of the present embodiment. DESCRIPTION OF EMBODIMENTS

[0020] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0021] Figure 1 is a side view of a disaster prevention vehicle 1 according to one embodiment of the present invention. This disaster prevention vehicle 1 is a vehicle that enables simultaneous firefighting and rescue operations. As shown in Figure 1, the disaster prevention vehicle 1 comprises a cab 4 located at the front of the chassis frame 2, a subframe 3 mounted on the chassis frame 2 behind the cab 4, a cargo box 6 attached to the subframe 3, and a fire pump 8. Inside the cab 4 are a driver's seat and rear seats for crew members. Inside the cargo box 6 are numerous pieces of equipment necessary for firefighting and rescue operations. The fire pump 8 is, for example, a centrifugal pump and supplies firefighting water drawn from a water source to the discharge point for firefighting operations. The fire pump 8 is located at the rear of the vehicle and under the floor of the cargo box 6. An operation panel 22 for controlling the operation of the fire pump 8 is provided at the rear end of the cargo box 2.

[0022] Figure 2 is a side view of the main components illustrating the layout of the fire pump 8 and its surroundings mounted on disaster prevention vehicle 1. Figure 3 is a top view of the main components illustrating the layout of the fire pump 8 and its surroundings mounted on disaster prevention vehicle 1.

[0023] As shown in Figure 2, the disaster relief vehicle 1 is equipped with a water tank 7 and an equipment storage space 6c on the floor 6a inside the cargo box 6. The disaster relief vehicle 1 is also equipped with a winch device 14 below the floor 6a inside the cargo box 6, between the rear wheels 1a and the fire pump 8. The water tank 7 is provided for storing water for firefighting and is located at the front of the cargo box 6. The equipment storage space 6c is located behind the water tank 7. The equipment storage space 6c stores equipment that can be carried by the crew. For example, this equipment could include a fire hose for use in firefighting activities and a hydraulic cutter for use in rescue activities. The winch device 14 is provided for rescue activities. The winch device 14 is used, for example, to rescue people trapped inside a vehicle at the scene of a traffic accident.

[0024] As shown in Figure 3, the chassis frame 2 is provided in pairs, left and right, extending in the longitudinal direction of the vehicle. The driving engine 5 and the clutch / transmission unit 51 are located at the front of the pair of left and right chassis frames 2, 2, and between the left and right sides of the pair of left and right chassis frames 2, 2. The clutch / transmission unit 51 is equipped with a power extraction device 10 for extracting power from the driving engine 5. The power outlet of the power extraction device 10 is provided above the chassis frame 2 and above the clutch / transmission unit 51. The subframe 3 comprises a right subframe 3a, a left first subframe 3b, a left second subframe 3c, an overhanging member 3d, a first cross member 3e, and a second cross member 3f.

[0025] The right subframe 3a is mounted along the upper surface of the right chassis frame 2. The right subframe 3a extends from the front end of the cargo box 6 to the rear end of the cargo box 6. The right chassis frame 2 extends from the front of the vehicle to the same position as the rear end of the right subframe 3a. The left first subframe 3b is mounted along the upper surface of the left chassis frame 2. The left first subframe 3b extends from the front end of the cargo box 6 to the position of the winch device 14. The left chassis frame 2 extends from the front of the vehicle to the same position as the rear end of the left first subframe 3b.

[0026] The left second subframe 3c is positioned further outward in the vehicle width direction (to the left side of the vehicle) than the left first subframe 3b. The rear of the left first subframe 3b and the front of the left second subframe 3c are connected by an overhanging member 3d. The left second subframe 3c is positioned parallel to the right subframe 3a. The rear end of the left second subframe 3c extends to the same position as the rear end of the right subframe 3a. As shown in Figures 2 and 3, the first cross member 3e connects the right subframe 3a and the left first subframe 3b at a position slightly forward of the rear wheel 1a. The second cross member 3f connects the right subframe 3a and the left first subframe 3b at a position slightly rearward of the rear wheel 1a.

[0027] As shown in Figure 2, floor base members 6b are attached to the upper surfaces of the first cross member 3e and the second cross member 3f. Floor base members 6b are also provided at the front end and rear end of the cargo box 6. The floor portion 6a of the cargo box 6 is attached to the upper surface of the floor base members 6b. The floor base members 6b support the floor portion 6a and create a small gap between the lower surface of the floor portion 6a and the upper surface of the subframe 3.

[0028] The fire pump 8 is driven by power extracted from the drive engine 5 by a power extraction device 10. The power outlet of the power extraction device 10 and the fire pump 8 are connected by a drive shaft 11, as shown in Figures 2 and 3. The drive shaft 11 has a first drive shaft 11a, a second drive shaft 11b, a third drive shaft 11c, a first joint 11d, and a second joint 11e. The first drive shaft 11a, the second drive shaft 11b, and the third drive shaft 11c are arranged in this order from the power outlet side of the power extraction device 10 toward the fire pump 8. The first joint 11d connects the first drive shaft 11a and the second drive shaft 11b and supports them rotatably. The second joint 11e connects the second drive shaft 11b and the third drive shaft 11c and supports them rotatably. The first joint portion 11d is attached to the first joint support member 12.

[0029] The left and right ends of the first joint support member 12 are connected to the right subframe 3a and the left first subframe 3b at a position further forward of the vehicle than the first cross member 3e. The second joint portion 11e is attached to the second joint support member 13. The left and right ends of the second joint support member 13 are connected to the right subframe 3a and the left first subframe 3b at a position between the front and rear of the first cross member 3e and the second cross member 3f. As shown in Figure 2, the second drive shaft 11b and the third drive shaft 11c are positioned approximately at the height of the subframe 3 when viewed from the side of the vehicle. The first cross member 3e is provided with a hole for the second drive shaft 11b to pass in the front-rear direction of the vehicle. The second cross member 3f is also provided with a hole for the third drive shaft 11c to pass in the front-rear direction of the vehicle.

[0030] Figure 4 is an enlarged plan view of the main part of Figure 3. Figure 5 is a simplified front view of the winch device 14 mounted on the disaster prevention vehicle 1, as seen from the front of the vehicle. As shown in Figures 4 and 5, the winch device 14 is attached to the right subframe 3a and the left first subframe 3b via a winch support frame 15. The winch support frame 15 has left and right connecting members 15a that connect the right subframe 3a and the left first subframe 3b, a main body mounting bracket 15b, a first downward extension member 15c, and a second downward extension member 15d.

[0031] The main mounting bracket 15b is provided on the left-right connecting member 15a, closer to the right subframe 3a. The first downward extension member 15c and the second downward extension member 15d are provided on the left-right connecting member 15a, closer to the left first subframe 3b. The first downward extension member 15c and the second downward extension member 15d are arranged at a predetermined distance from each other in the longitudinal direction (left-right direction) of the left-right connecting member 15. The first downward extension member 15c and the second downward extension member 15d are provided to extend downward from the left-right connecting member 15a. The third drive shaft 11c is positioned between the first downward extension member 15c and the second downward extension member 15d.

[0032] The winch device 14 comprises a main body 142, a wire storage section 143, and a wire guide section 144. The main body 142 has an internal mechanism for feeding out and retracting the wire 141. The main body 142 is attached to the left and right connecting members 15a by a main body mounting bracket 15b. The main body 142 is positioned to be suspended from the left and right connecting members 15a. The wire storage section 143 has an outer shape that is roughly short and cylindrical. The wire storage section 143 has a mechanism for storing the wire 141 wound by the main body 142 so as not to tangle. The wire storage section 143 is attached to the lower ends of the first lower extension member 15c and the second lower extension member 15d. The wire guide section 144 connects the main body 142 and the wire storage section 143. The wire guide section 144 has the function of allowing the wire 141 to move smoothly between the main body section 142 and the wire storage section 143.

[0033] Figure 6 is a front view of the fire pump 8 of this embodiment, viewed from the front of the vehicle. Figure 7 is a schematic diagram illustrating the transmission mechanism 85 of the fire pump 8. As shown in Figures 4 and 6, the fire pump 8 comprises an impeller casing 81, an impeller 82 disposed inside the impeller casing 81, an impeller rotation shaft 83 that rotates the impeller 82, a power input shaft 84, a transmission mechanism casing 86, and a transmission mechanism 85 provided in the transmission mechanism casing 86. A water intake port 8a for firefighting is provided on the rear side of the impeller casing 81. The transmission mechanism casing 86 is attached to the front side of the impeller casing 81. The axis C1 of the impeller rotation shaft 83 extends in the longitudinal direction of the vehicle. An impeller-side pulley 85d is connected to the front end of the impeller rotation shaft 83. The impeller-side pulley 85d is provided outside the transmission mechanism casing 86.

[0034] The power input shaft 84 is attached to the transmission mechanism casing 86. Rotational power from the power take-off devices 10 on both front sides is input to the power input shaft 84 via the drive shaft 11. The axis C2 of the power input shaft 84 extends in the longitudinal direction of the vehicle. Most of the power input shaft 84 is located inside the transmission mechanism casing 86, but the vehicle-front end of the power input shaft 84 is exposed to the outside of the transmission mechanism casing 86. A drive shaft connection portion 84a is provided at this vehicle-front end of the power input shaft 84. The vehicle-rear end of the third drive shaft 11c is connected to the drive shaft connection portion 84a.

[0035] The transmission mechanism 85 transmits rotational power input to the power input shaft 84 to the impeller rotation shaft 83 while keeping the axis C1 of the impeller rotation shaft 83 and the axis C2 of the power input shaft 84 parallel and spaced apart. The power input shaft 84 is positioned above the impeller rotation shaft 83. As shown in Figure 7, the transmission mechanism 85 includes an input shaft side gear 85a and an impeller side gear 85b. The input shaft side gear 85a and the impeller side gear 85b are located inside the transmission mechanism casing 86.

[0036] The input shaft gear 85a is mounted on the power input shaft 84 so as to rotate integrally with the power input shaft 84. The impeller side gear 85b is mounted on the impeller rotation shaft 83 so as to rotate integrally with the impeller rotation shaft 83. The input shaft side gear 85a and the impeller side gear 85b are meshed together. As a result, when the power input shaft 84 rotates, the impeller rotation shaft 83 also rotates in conjunction with it. The input shaft side gear 85a and the impeller side gear 85b are configured to have a predetermined gear ratio. This ensures that the relationship between the engine speed of the drive engine 5, the rotation speed of the drive shaft 11, and the rotation speed of the fire pump 8 is appropriate. By changing this gear ratio, it is possible to easily change the rotation speed settings of each part.

[0037] As shown in Figures 6 and 7, the transmission mechanism casing 86 has a first mounting portion 86a on one side in the vehicle width direction (one side in the left-right direction) for mounting the vacuum pump 9, and a second mounting portion 86b on the other side in the vehicle width direction (the other side in the left-right direction). Specifically, the first mounting portion 86a is formed on the left side surface of the transmission mechanism casing 86. The vacuum pump 9 is mounted to this first mounting portion 86a. The vacuum pump 9 is provided to exhaust the internal air and fill it with priming water when the fire pump 8 is started. The vacuum pump 9 is integrated with the fire pump 8 by being mounted to the first mounting portion 86. The vacuum pump 9 has a pump rotation shaft 91 to which rotational driving force is applied from the outside. The axis C3 of the pump rotation shaft 91 and the axis C1 of the impeller rotation shaft 83 are arranged to be parallel and spaced apart. More specifically, the pump rotation shaft 91 is positioned horizontally away from the impeller rotation shaft 83 to the left side of the vehicle.

[0038] The pump rotating shaft 91 is mostly located inside the vacuum pump 9. However, the vehicle-front end of the pump rotating shaft 91 is exposed to the outside of the transmission mechanism casing 86. A vacuum pump-side pulley 85e is attached to this vehicle-front end of the pump rotating shaft 91. The transmission mechanism 85 is configured to transmit rotational power input to the power input shaft 84 to the pump rotating shaft 91, which provides rotational driving force to the vacuum pump 9. Specifically, the transmission mechanism 85 comprises an impeller-side pulley 85d, a vacuum pump-side pulley 85e with an electromagnetic clutch 85c, and a transmission belt 85f stretched between the impeller-side pulley 85d and the vacuum pump-side pulley 85e.

[0039] When rotational power is input from the drive shaft 11 to the power input shaft 84, the impeller rotation shaft 83 rotates due to the meshing of the input shaft side gear 85a and the impeller side gear 85b. When the impeller rotation shaft 83 rotates, the impeller side pulley 85d also rotates via the electromagnetic clutch 85c. The rotation of the impeller side pulley 85d is transmitted to the vacuum pump side pulley 85e via the transmission belt 85f. When this vacuum pump side pulley 85e rotates, the pump rotation shaft 91 rotates.

[0040] The vacuum pump 9 is installed to exhaust the air inside the fire pump 8 and fill it with priming water when the fire pump 8 is started. Therefore, once the inside of the fire pump 8 is filled with priming water, driving the vacuum pump 9 further would be wasteful in terms of energy consumption efficiency. Except when the fire pump 8 is started, the electromagnetic clutch 85c is set to the disengaged position, so that the vacuum pump 9 does not rotate even when the impeller rotation shaft 83 rotates in conjunction with the rotation of the power input shaft 84. This enables efficient operation of the vacuum pump 9.

[0041] As shown in Figures 2 and 4, the second mounting portion 86b of the transmission mechanism casing 86 is attached to a pump support frame 16 for supporting the fire pump 8 in a hanging manner from the subframe 3. The pump support frame 16 comprises a pair of front and rear left-right connecting members 16a, 16a that span between the right subframe 3a and the left second subframe 3c, and a mounting base 16b that hangs down from the longitudinal center of the pair of front and rear left-right connecting members 16a, 16a. The ends of each left-right connecting member 16a are fixed to the upper surfaces of the right subframe 3a and the left second subframe 3c by fasteners or the like. The upper end of the mounting base 16b is fixed to the lower surfaces of the pair of front and rear left-right connecting members 16a, 16a by welding or the like. The portion of the second mounting portion 86b of the transmission mechanism casing 86 is fixed to the mounting base 16b by fasteners or the like. As a result, the fire pump 8 and the vacuum pump 9 are arranged to hang down from the right subframe 3a and the left second subframe 3c.

[0042] Figure 8 is a piping system diagram of the disaster prevention vehicle 1 of this embodiment. Figure 9 is a main part plan view showing the piping layout of the disaster prevention vehicle 1. Figure 10 is a main part side view showing the layout of the water tank intake piping 18 in the disaster prevention vehicle 1. Figure 11 is a main part side view showing the layout of the first water tank supply piping 20 in the disaster prevention vehicle 1. As shown in Figures 8 and 9, the disaster prevention vehicle 1 is equipped with a pump intake piping 17, a water tank intake piping 18, a discharge piping 19, a first water tank supply piping 20, and a second water tank supply piping 21.

[0043] The pump suction piping 17 is a piping system for supplying fire extinguishing water drawn from an external water source or stored in the water tank 7 to the inside of the fire pump 8 through the intake port 8a. The pump suction piping 17 includes a manifold 171, a first intake port 172, a second intake port 173, a first intake valve 174, and a second intake valve 175. The manifold 171 has an external shape that is roughly rectangular. The manifold 171 is constructed by attaching a plurality of flanges 171b, 171c, and 171d to a main body 171a formed into a rectangular parallelepiped shape by welding metal plates. A flange 171b is provided on the front side of the manifold 171. The flange 171b is connected to the intake port 8a of the fire pump 8. Two flanges 171c, 171c are provided on the rear side of the manifold 171.

[0044] Two flanges 171c, 171c are connected to a first water intake valve 174 and a second water intake valve 175. A first water intake port 172 is provided at the end of the first water intake valve 174. A second water intake port 173 is provided at the end of the second water intake valve 175. The first water intake port 172 and the second water intake port 173 are provided to introduce firefighting water from an external water source to the fire pump 8. The first water intake port 172 and the second water intake port 173 are positioned so that firefighters can access them from the rear of the vehicle. The first water intake port 172 and the second water intake port 173 are positioned side by side at the rear of the vehicle. A flange 171d is provided on the left side of the manifold 171. The flange 171d is connected to the water tank intake piping 18.

[0045] The water tank intake pipe 18 is a pipe that supplies fire-fighting water stored in the water tank 7 to the fire pump 8 for discharge. As shown in Figures 8 to 10, the water tank intake pipe 18 has its upstream end at the outlet 73 located at the rear end of the water tank 7. The water tank intake pipe 18 has its downstream end at the connection point to the flange 171d of the manifold 171. The water tank intake pipe 18 has an electrically operated water tank intake valve 181. When fire-fighting water from the water tank 7 is not supplied to the fire pump 8, the electrically operated water tank intake valve 181 is closed.

[0046] As shown in Figure 10, the discharge port 73 at the upstream end of the water tank intake pipe 18 is located above the floor 6a of the cargo box 6. On the other hand, the manifold 171 to which the downstream end of the water tank intake pipe 18 is connected is located below the floor 6a of the cargo box 6. Therefore, the water tank intake pipe 18 is guided from above to below the floor 6a through a floor opening 6d provided in the floor 6a. The electric on / off valve 181 for water tank intake of the water tank intake pipe 18 is located above the floor 6a. The water tank intake pipe 18 is configured to extend linearly along the subframe 3 from directly below the floor opening 6d of the cargo box 6 to a position above the manifold 171. In addition, the water tank intake pipe 18 is located to the left of the fire pump 8 so as to partially overlap with the fire pump 8 when viewed from the side of the vehicle.

[0047] The discharge pipe 19 is a pipe installed on the discharge side of the fire pump 8. As shown in Figures 8, 9, and 11, the discharge pipe 19 has a check valve 191, a first discharge port 192, a second discharge port 193, a first water discharge shut-off valve 194, and a second water discharge shut-off valve 195. The discharge pipe 19 has the discharge port 8b of the fire pump 8 as its upstream end. The discharge pipe 19 has the first water discharge port 192 and the second water discharge port 193 as its downstream ends. As shown in Figure 4, when viewed from above, the discharge pipe 19 is configured to start from the discharge port 8b located on the left side of the vehicle, pass over the manifold 171, and be guided to the right side of the vehicle.

[0048] As shown in Figure 8, the check valve 191 is located near the discharge port 8b. The check valve 191 is designed to close the flow path in the discharge pipe 19 when the drive engine 5 stops, preventing backflow of the firefighting water in the fire pump 8. A first water discharge shut-off valve 194 is located near the first water outlet 192. A second water discharge shut-off valve 195 is located near the second water outlet 193. As shown in Figures 9 and 11, the first water outlet 192 and the second water outlet 193 are positioned so that firefighters can access them from the rear of the vehicle. The first water outlet 192 and the second water outlet 193 are located vertically at the rear of the vehicle.

[0049] As shown in Figure 8, a chemical tank 32 is connected to the middle of the discharge pipe 19 via a chemical injection pipe 31. Furthermore, a motor pump unit 33 is provided in the middle of the chemical injection pipe 31 to send the chemical solution in the chemical tank 32 into the discharge pipe 19 in a foamy form, and a check valve 34 is provided downstream of it to prevent backflow.

[0050] The first water tank supply piping 20 is a pipe that supplies firefighting water drawn up from outside the vehicle by the fire pump 8 to the water tank 7 inside the cargo box 6. As shown in Figures 8, 9, and 11, the first water tank supply piping 20 is connected to the middle of the discharge piping 19, with the connection point being the upstream end. The first water tank supply piping 20 has the first inlet 71, located at the rear end of the water tank 7, as its downstream end. The first water tank supply piping 20 has an electrically operated water tank supply valve 201. The electrically operated water tank supply valve 201 is located at the connection point with the discharge piping 19. When no firefighting water is to be stored in the water tank 7 after being drawn up from outside the vehicle, the electrically operated water tank supply valve 201 is closed.

[0051] As shown in Figure 11, the first inlet 71 at the downstream end of the first water tank supply piping 20 is positioned above the floor 6a of the cargo box 6. On the other hand, the electric shut-off valve 201 for supplying water to the water tank, located at the upstream end of the first water tank supply piping 20, is positioned below the floor 6a of the cargo box 6. Therefore, the first water tank supply piping 20 is guided from below to above the floor 6a through a floor opening 6d provided in the floor 6a. The first water tank supply piping 20 is positioned to the right of the fire pump 8 so as to partially overlap it with the fire pump 8 in a side view of the vehicle.

[0052] The second water tank supply piping 21 is a piping system for supplying firefighting water, drawn up from outside the vehicle by a pump located outside the vehicle and separate from the fire pump 8, to the water tank 7 inside the cargo box 6. As shown in Figures 8 and 9, the second water tank supply piping 21 has a right-side water supply port 211, a left-side water supply port 212, a right-side water supply shut-off valve 213, and a left-side water supply shut-off valve 214. The second water tank supply piping 21 has its upstream ends at the right-side water supply port 211 and the left-side water supply port 212. The right-side water supply port 211 is located on the right side of the vehicle so that firefighters can access it from the right side of the vehicle. The left-side water supply port 212 is located on the left side of the vehicle so that firefighters can access it from the left side of the vehicle. The piping extending downstream from the right-side water supply port 211 and the piping extending downstream from the left-side water supply port 212 merge midway to form a single piping system that connects to the second inlet 72 located at the rear end of the water tank 7. The downstream end of the second water tank supply piping 21 is the second inlet 72. The right-side water supply valve 213 is located near the right-side water supply port 211. The left-side water supply valve 214 is located near the left-side water supply port 212.

[0053] As described above, the disaster prevention vehicle 1 according to this embodiment includes a subframe 3 mounted on a chassis frame 2, a cargo box 6 mounted on the subframe 3, and a fire pump 8 that is driven by power taken out from a driving engine 5 by a power take-out device 10 and is located at the rear of the vehicle and under the floor of the cargo box 6. The fire pump 8 includes an impeller 82, an impeller rotation shaft 83 that rotates the impeller 82, a power input shaft 84 to which rotational power from the power take-out device 10 on the front side of the vehicle is input via a drive shaft 11, and a transmission mechanism 85 that transmits the rotational power input to the power input shaft 84 to the impeller rotation shaft 83 while separating the axis C1 of the impeller rotation shaft 83 and the axis C2 of the power input shaft 84 in parallel.

[0054] According to the above configuration, rotational power from the power extraction device 10 is input to the power input shaft 84 via the drive shaft 11. The axis C2 of the power input shaft 84 is spaced parallel to the axis C1 of the impeller rotation shaft 83 that rotates the impeller 82 of the fire pump 8. The rotational power input to the power input shaft 84 is transmitted to the impeller rotation shaft 83 by the transmission mechanism 85. This eliminates the need to position the connection point of the drive shaft 11 to the fire pump 8 on the extension of the impeller rotation shaft 83. Furthermore, while appropriately maintaining the connection angle of the drive shaft 11 to the drive shaft connection part 84a on the power input shaft 84, the positions of the impeller 82 and impeller casing 81 can be shifted vertically and horizontally relative to the drive shaft connection part 84a. This allows for a well-balanced arrangement of additional equipment and the fire pump 8 when adding equipment near the fire pump 8 under the floor of the cargo box 6. In addition, equipment can be added more flexibly than before, and the layout of the fire pump 8 can be easily changed at that time. Since additional equipment can be easily added to the underside of the cargo box 6, the equipment storage space 6c above the floor of the cargo box 6 can maintain the same space as before.

[0055] In the above embodiment, a vacuum pump 9 is attached to the transmission mechanism casing 86 to which the transmission mechanism 85 is mounted, for exhausting the internal air and filling it with priming water when the fire pump 8 is started. The transmission mechanism 85 is configured to transmit the rotational power input to the power input shaft 84 to the pump rotation shaft 91, which provides rotational driving force to the vacuum pump 9.

[0056] According to the above configuration, the fire pump 8 and the vacuum pump 9 can be integrated by attaching the vacuum pump 9 to the transmission mechanism casing 86. Furthermore, since the transmission mechanism 85 is configured to transmit the rotational power input to the power input shaft 84 to the pump rotation shaft 91 which provides rotational driving force to the vacuum pump 9, the drive source for the vacuum pump 9 and the drive source for the fire pump 8 can be combined into one. As a result, the space required for the fire pump 8 and the vacuum pump 9 can be reduced, making it easy to add equipment near the fire pump 8.

[0057] In the above embodiment, the axis C1 of the impeller rotation shaft 83 and the axis C3 of the pump rotation shaft 91 are arranged parallel to each other and spaced apart. The power input shaft 84 is positioned above the impeller rotation shaft 83, while the pump rotation shaft 91 is positioned to the side of the impeller rotation shaft 83.

[0058] According to the above configuration, the power input shaft 84 is positioned above the impeller rotation shaft 83. This allows power from the drive engine 5 to be transmitted to the impeller rotation shaft 83 while appropriately maintaining the connection angle of the drive shaft 11 to the drive shaft connection portion 84a on the power input shaft 84, even when the power outlet of the power take-off device 10 is located above the chassis frame 2 and the impeller rotation shaft 83 of the fire pump 8 is located at the same height as the chassis frame 2. Furthermore, since the pump rotation shaft 91 of the vacuum pump 9 is positioned to the side of the impeller rotation shaft 83, it is possible to prevent the fire pump 8 and the vacuum pump 9 from protruding significantly below the chassis frame 2. This allows for a positioning of the fire pump 8 that ensures sufficient clearance with the road surface.

[0059] In the above embodiment, the transmission mechanism casing 86 is provided with a first mounting portion 86a on one side in the vehicle width direction (left side of the vehicle) for mounting the vacuum pump 9, and a second mounting portion 86b on the other side in the vehicle width direction (right side of the vehicle). The second mounting portion 86b is attached to a pump support frame 16 for supporting the fire pump 8 in a hanging manner from the subframe 3.

[0060] With the above configuration, the pump support frame 16 allows the fire pump 8 and vacuum pump 9 to be easily positioned under the floor of the cargo box 6. Furthermore, since the fire pump 8 is attached to the pump support frame 16 from one side in the vehicle width direction, the fire pump 8 can be positioned with the vertical distance between the floor 6a of the cargo box 6 and the fire pump 8 kept to a minimum. This prevents the fire pump 8 from protruding significantly below the chassis frame 2, even if its vertical dimensions are large. As a result, the fire pump 8 can be positioned with sufficient clearance from the road surface.

[0061] The disaster prevention vehicle 1 of the above embodiment includes a first water tank supply pipe 20 that sends firefighting water drawn up from outside the vehicle by the drive of a fire pump 8 to a water tank 7 inside the cargo box 6, and a water tank intake pipe 18 that supplies firefighting water stored in the water tank 7 to the fire pump 8 for discharge. The first water tank supply pipe 20 is positioned on one side in the vehicle width direction of the fire pump 8 so as to partially overlap with the fire pump 8 when viewed from the side of the vehicle, while the water tank intake pipe 18 is positioned on the other side in the vehicle width direction of the fire pump 8 so as to partially overlap with the fire pump 8 when viewed from the side of the vehicle.

[0062] According to the above configuration, the first water tank supply piping 20 and the water tank intake piping 18 can be kept as far away from the floor of the cargo box 6 as possible, thereby securing equipment storage space 6c, and the weight balance and drive balance of the fire pump 8 in the vehicle width direction can be made appropriate.

[0063] The embodiments disclosed herein are illustrative in all respects and are not intended to be restrictive. The technical scope of the present invention is not construed solely by the embodiments described above, but is defined by the claims. Furthermore, the technical scope of the present invention includes all modifications within the meaning and scope of equivalence to the claims.

[0064] For example, in the above embodiment, the transmission mechanism 85 included an input shaft side gear 85a and an impeller side gear 85b. The input shaft side gear 85a and the impeller side gear 85b were meshed together. The present invention is not limited to this, and multiple other gears may be meshed between the input shaft side gear and the impeller side gear. Furthermore, the transmission mechanism may not transmit rotational power using multiple meshing gears, but rather using a chain and sprockets.

[0065] Furthermore, in the above embodiment, the power input shaft 84 was positioned above the impeller rotation shaft 83, and the pump rotation shaft 91 was positioned horizontally away from the impeller rotation shaft 83 to the left side of the vehicle. The present invention is not limited to this, and the pump rotation shaft may be positioned vertically away from the impeller rotation shaft. In this case, it is preferable that the vertical distance between the pump rotation shaft and the impeller rotation shaft is smaller than the vertical distance between the power input shaft and the impeller rotation shaft.

[0066] Furthermore, in the above embodiment, the first water tank supply pipe 20 and the water tank suction pipe 18 were arranged so as to partially overlap with the fire pump 8 when viewed from the side of the vehicle. The present invention is not limited to this, and the first water tank supply pipe and the water tank suction pipe do not necessarily have to partially overlap with the fire pump 8 when viewed from the side of the vehicle. Also, in the above embodiment, the first water tank supply pipe 20 was located to the right of the fire pump 8, and the water tank suction pipe 18 was located to the left of the fire pump 8. The present invention is not limited to this, and the first water tank supply pipe and the water tank suction pipe may be located to either the left or right side of the fire pump. [Explanation of Symbols]

[0067] 1. Disaster prevention vehicle 2 Chassis frame 3 Subframes 5. Driving engine 6 packing boxes 7 Aquariums 8. Fire pump 9. Vacuum pump 10 Power take-off device 11 Drive shaft 16 Pump support frame 18. Aquarium intake piping 20. Water supply piping for the first water tank 82 Impeller 83 Impeller Rotation Shaft 84 Power input shaft 85 Transmission Mechanism 86 Transmission mechanism casing 86a First mounting section 86b Second mounting section 91 Pump Rotating Shaft C1 axis center C2 axis center C3 axis center

Claims

1. A disaster prevention vehicle comprising a subframe mounted on a chassis frame, a cargo box mounted on the subframe, and a fire pump driven by power extracted from the drive engine by a power extraction device and located at the rear of the vehicle and under the floor of the cargo box, The fire pump comprises an impeller, an impeller rotation shaft for rotating the impeller, a power input shaft to which rotational power from the power take-off device on the front side of the vehicle is input via a drive shaft, and a transmission mechanism that transmits the rotational power input to the power input shaft to the impeller rotation shaft while separating the axis of the impeller rotation shaft and the axis of the power input shaft in parallel. The transmission mechanism casing to which the transmission mechanism is attached is equipped with a vacuum pump for exhausting the internal air and filling it with priming water when the fire pump is started. The transmission mechanism is configured to transmit the rotational power input to the power input shaft to the pump rotation shaft for providing rotational driving force to the vacuum pump. The axis of the impeller rotation shaft and the axis of the pump rotation shaft are arranged to be parallel and spaced apart. The power input shaft is positioned above the impeller rotation shaft, while the pump rotation shaft is positioned to the side of the impeller rotation shaft. The transmission mechanism casing is provided with a first mounting portion on one side in the vehicle width direction for mounting the vacuum pump and a second mounting portion on the other side in the vehicle width direction. The second mounting portion is attached to a pump support frame for supporting the fire pump in a manner that hangs down from the subframe. A disaster prevention vehicle characterized by the following features.

2. The vehicle is equipped with a water tank supply piping that sends fire extinguishing water drawn up from outside the vehicle by the operation of the fire pump to a water tank inside the cargo box, and a water tank suction piping that supplies the fire extinguishing water stored in the water tank to the fire pump for discharge. The water tank supply piping is positioned on one side in the vehicle width direction of the fire pump so as to partially overlap with the fire pump when viewed from the side of the vehicle, The water tank intake piping is configured to be positioned on the other side in the vehicle width direction of the fire pump so as to partially overlap with the fire pump when viewed from the side of the vehicle. The disaster prevention vehicle according to feature 1.

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