All-terrain fire truck water pump power take-off system

Abstract

The application discloses a kind of all-terrain fire engine water pump power take-off system, including front transmission component, power source component and rear transmission component, and front transmission component is equipped with water pump power take-off unit, wherein, front transmission component includes front axle motor, front axle motor independently controls the on-off of power transmission between power source component and front transmission component, water pump power take-off unit includes power take-off motor, power take-off motor independently controls the on-off of power transmission between power source component and water pump power take-off unit, rear transmission component includes rear axle motor, and rear axle motor independently controls the on-off of power transmission between power source component and rear transmission component.The power take-off system in the all-terrain fire engine water pump power take-off system of the application is connected with vehicle main reducer, and power is derived from engine, and independent forward, reverse and working gear are simultaneously arranged, can avoid operation program error or damage power take-off system to appear when mis-touching power take-off switch, improve the use safety of system.

Description

Technical Field

[0001] This invention relates to an all-terrain vehicle, and more specifically, to a water pump power take-off system for an all-terrain fire truck. Background Technology

[0002] All-terrain fire trucks, also known as off-road fire trucks or mountain fire trucks, are special vehicles designed specifically for firefighting and rescue missions in complex terrains inaccessible to ordinary wheeled vehicles. They combine the high mobility of off-road vehicles with the specialized capabilities of firefighting equipment, and are primarily used in forest fires, grassland fires, oil field fires, geological disaster sites, and remote areas lacking roads. A power take-off (PTO) is one or more sets of transmission gears that, connected to the output shaft of the gearbox, output power to external working devices, enabling the driving of various auxiliary equipment and performing multiple functions. It is widely used in various special-purpose vehicles.

[0003] In existing publicly available technologies, the water pumps equipped on all-terrain fire trucks are mainly driven by a small general-purpose gasoline engine mounted in the cargo box. This technical approach occupies a lot of space and is not suitable for high-power demand conditions. It also leads to problems such as increased production costs and more parts.

[0004] To address the aforementioned technical problems, this invention proposes a power take-off system and control method for a water pump in an all-terrain fire truck. Summary of the Invention

[0005] Therefore, it is necessary to provide an all-terrain fire truck water pump power take-off system to address the aforementioned technical problems.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A power take-off system for a water pump in an all-terrain fire truck is characterized in that the system comprises a front drive assembly, a power source assembly, and a rear drive assembly, wherein the front drive assembly is equipped with a water pump power take-off unit. in, The front drive assembly includes a front axle motor, which independently controls the on / off state of power transmission between the power source assembly and the front drive assembly. The power take-off unit of the water pump includes a power take-off motor, which independently controls the on / off of power transmission between the power source assembly and the power take-off unit of the water pump. The rear drive assembly includes a rear axle motor, which independently controls the on / off state of power transmission between the power source assembly and the rear drive assembly.

[0007] As a preferred embodiment of the present invention, The aforementioned front drive assembly, in the direction of power transmission, sequentially includes a front drive shaft, a front axle drive gear, a front axle reducer driven gear, a front axle differential, a front axle output shaft, a front axle engagement gear ring, a front axle engagement sleeve, a front wheel axle spline hub, a front wheel axle, and a front wheel. The front axle motor drives the front axle shift fork to move, and the front axle shift fork controls the front axle engagement sleeve, causing the front axle engagement sleeve to engage or disengage synchronously with the front wheel axle spline hub and the front axle engagement gear ring. The power take-off unit for the water pump includes a power take-off gear, a power take-off engagement gear ring, a power take-off engagement sleeve, a power take-off splined hub, a power take-off output shaft, and a water pump. The power take-off motor drives the power take-off shift fork to move, and the power take-off shift fork controls the power take-off engagement sleeve, causing the power take-off engagement sleeve to engage or disengage synchronously with the power take-off splined hub and the power take-off engagement gear ring. The rear drive assembly, in the direction of power transmission, sequentially includes a rear drive shaft, a rear axle drive gear, a rear axle reducer driven gear, a rear axle differential, a rear axle output shaft, a rear axle engagement gear ring, a rear axle engagement sleeve, a rear wheel half-shaft splined hub, a rear wheel half-shaft, and a rear wheel. The rear axle motor drives the rear axle shift fork to move, and the rear axle shift fork controls the rear axle engagement sleeve, causing the rear axle engagement sleeve to engage or disengage synchronously with the rear wheel half-shaft splined hub and the rear axle engagement gear ring.

[0008] As a preferred embodiment of the present invention, The power source components include an engine and a transmission.

[0009] A control circuit for the power take-off system of a water pump in an all-terrain fire truck as described in any of the preceding claims, characterized in that the control circuit includes a power supply link and a grounding link, the power supply link includes a first power terminal and a second power terminal, and the grounding link includes a first grounding terminal and a second grounding terminal. The first electrical terminal is connected to the first common terminal in sequence via the power take-off switch, the contact switch of the power take-off relay, and the power take-off motor. The first common terminal is connected to the second common terminal via the water spray front drive switch, the front axle motor, and the front drive switch. The first common terminal is electrically connected to the second common terminal via the water spray rear drive switch, the rear axle motor, and the rear drive switch. The second common pole is electrically connected to the second power terminal after being switched by the contact switch of the driving relay. The first grounding terminal is electrically connected to the second grounding terminal via the coil of the power take-off relay, the gearbox controller, and the drive relay. The transmission controller is electrically connected to the electronic parking brake controller, and the electronic parking brake controller is electrically connected to the parking switch. The power take-off relay and drive relay are opened or closed based on the gear position signal from the gearbox controller. When the all-terrain fire truck is in front-wheel drive, rear-wheel drive, or four-wheel drive mode, the contact switch of the drive relay is closed, and the contact switch of the power take-off relay is open. When the all-terrain fire truck is in parking spray mode, rear-wheel drive spray mode, or four-wheel drive spray mode, the contact switch of the drive relay is open, and the contact switch of the power take-off relay is closed.

[0010] In a preferred embodiment of the present invention, the gear position signals include five gear position signals: parking, neutral, reverse, forward, and water spray.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a power take-off (PTO) system for an all-terrain fire truck pump. The PTO system of this invention is connected to the vehicle's main reducer and is powered by the engine. It can adapt to various operating conditions, has a compact layout, solves the problem of cargo box occupation, and is equipped with independent forward, reverse, and working gears. This can prevent accidental activation of the PTO switch, which could lead to operating errors or damage to the PTO system, thus improving the safety of the system. Attached Figure Description

[0012] To more clearly illustrate the solutions in this invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the modular structure of the all-terrain fire truck water pump power take-off system of the present invention; Figure 2 This is a schematic diagram of the control electrical connections of the all-terrain fire truck water pump power take-off system of the present invention. Detailed Implementation

[0014] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0015] like Figure 1 As shown, the all-terrain fire truck's water pump power take-off system includes a front drive assembly S1, a power source assembly S2, and a rear drive assembly S3. The front drive assembly S1 is equipped with a water pump power take-off unit S11.

[0016] The front drive assembly S1 includes a front axle motor 11, which independently controls the power transmission between the power source assembly S2 and the front drive assembly S1. The water pump power take-off unit S11 includes a power take-off motor 6, which independently controls the power transmission between the power source assembly S2 and the water pump power take-off unit S11. The rear drive assembly S3 includes a rear axle motor 33, which independently controls the power transmission between the power source assembly S2 and the rear drive assembly S3.

[0017] The front drive assembly S1 includes, in sequence according to the direction of power transmission, a front drive shaft 20, a front axle drive gear 19, a front axle reducer driven gear 9, a front axle differential 10, a front axle output shaft 17, a front axle engagement gear ring 18, a front axle engagement sleeve 16, a front wheel half-shaft splined hub 15, a front wheel half-shaft 14, and a front wheel 13. The front axle motor 11 drives the front axle shift fork 12 to move, and the front axle shift fork 12 controls the front axle engagement sleeve 16, so that the front axle engagement sleeve 16 engages or disengages synchronously with the front wheel half-shaft splined hub 15 and the front axle engagement gear ring 18.

[0018] The power take-off unit S11 includes a power take-off gear 8, a power take-off engagement gear ring 5, a power take-off engagement sleeve 4, a power take-off splined hub 3, a power take-off output shaft 2, and a water pump 1. The power take-off motor 6 drives the power take-off shift fork 7 to move. The power take-off shift fork 7 controls the power take-off engagement sleeve 4, and causes the power take-off engagement sleeve 4 to engage or disengage synchronously with the power take-off splined hub 3 and the power take-off engagement gear ring 5.

[0019] The power source assembly S2 includes an engine 22 and a gearbox 21.

[0020] The rear drive assembly S3, in the direction of power transmission, sequentially includes a rear drive shaft 23, a rear axle drive gear 24, a rear axle reducer driven gear 25, a rear axle differential 26, a rear axle output shaft 30, a rear axle engagement gear ring 31, a rear axle engagement sleeve 27, a rear wheel half-shaft splined hub 28, a rear wheel half-shaft 29, and a rear wheel 34. The rear axle motor 33 drives the rear axle shift fork 32 to move, and the rear axle shift fork 32 controls the rear axle engagement sleeve 27, causing the rear axle engagement sleeve 27 to engage or disengage synchronously with the rear wheel half-shaft splined hub 28 and the rear axle engagement gear ring 31.

[0021] like Figure 2 The diagram shown is a schematic of the control electrical connections of the all-terrain fire truck water pump power take-off system of the present invention.

[0022] The control circuit includes a power link P and a ground link N. The power link P includes a first power terminal P1 and a second power terminal P2. The ground link N includes a first ground terminal N1 and a second ground terminal N2.

[0023] The first electrical terminal P1 is connected to the first common terminal P3 via the power take-off switch 130, the contact switch of the power take-off relay 140, and the power take-off motor 6. The first common terminal P3 is connected to the second common terminal P4 via the water spray front drive switch 160, the front axle motor 11, and the front drive switch 190. The first common terminal P3 is electrically connected to the second common terminal P4 via the water spray rear drive switch 170, the rear axle motor 33, and the rear drive switch 180.

[0024] The second common pole P4 is electrically connected to the second electrical terminal P2 after being switched by the contact switch of the drive relay 200.

[0025] The first grounding terminal N1 is electrically connected to the second grounding terminal N2 via the coil of the power take-off relay 140, the gearbox controller 110, and the drive relay 200.

[0026] The transmission controller 110 is electrically connected to the electronic parking controller 210, which is electrically connected to the parking switch 220.

[0027] The power take-off relay 140 and drive relay 200 open or close based on the gear position signal from the transmission controller 110. When the all-terrain fire truck is in front-wheel drive, rear-wheel drive, or four-wheel drive mode, the contact switch of the drive relay 200 is closed, and the contact switch of the power take-off relay 140 is open. When the all-terrain fire truck is in parking spray mode, rear-wheel drive spray mode or four-wheel drive spray mode, the contact switch of the drive relay 200 is open and the contact switch of the power take-off relay 140 is closed.

[0028] It should be noted that the transmission controller 110 is used to send gear position signals, including five gears: Park (P), Neutral (N), Reverse (R), Drive (D), and Wastewater Injection (W).

[0029] The following describes the operation of the pump power take-off system of this all-terrain fire truck, including drive mode and water spray mode. Drive mode includes two-wheel drive and four-wheel drive modes. Water spray modes include parking water spray mode, front-wheel drive water spray mode, rear-wheel drive water spray mode, and four-wheel drive water spray mode.

[0030] 1. Drive Mode (1) Front-wheel drive mode The transmission controller 110 sends a gear position signal for R or D, which closes the contact switch in the drive relay 200 and opens the contact in the power take-off relay 140.

[0031] At this time, the power take-off switch 130, the water spray front drive switch 160, and the water spray rear drive switch 170 all fail, which can effectively protect the power take-off system and prevent damage to the power take-off unit caused by accidental activation.

[0032] When the front drive switch 190 is closed, the front axle motor 11 operates, and the front axle motor 11 pushes the front axle shift fork 12 to move. The front axle engagement sleeve 16 moves with the front axle shift fork 12, and the front axle engagement sleeve 16 engages with the front wheel half shaft spline hub 15 and the front axle engagement gear ring 18 simultaneously.

[0033] At this time, the power is generated by the engine 22, and transmitted to the front wheel 13 through the gearbox 21, front drive shaft 20, front axle drive gear 19, front axle reducer driven gear 9, front axle differential 10, front axle output shaft 17, front axle engagement gear ring 18, front axle engagement sleeve 16, front wheel half shaft spline hub 15, and front wheel half shaft 14, thereby driving the front wheel 13 forward or backward.

[0034] (2) Rear-wheel drive mode The transmission controller 110 sends a gear position signal for R or D, which closes the contact switch in the drive relay 200 and opens the contact in the power take-off relay 140.

[0035] At this time, the power take-off switch 130, the water spray front drive switch 160, and the water spray rear drive switch 170 all fail, which can effectively protect the power take-off system and prevent damage to the power take-off unit caused by accidental activation.

[0036] When the rear drive switch 210 is closed, the rear axle motor 33 operates, and the rear axle motor 33 pushes the rear axle shift fork 32 to move. The rear axle engagement sleeve 27 then moves with the rear axle shift fork 32, and the rear axle engagement sleeve 27 engages with the rear wheel half-shaft spline hub 28 and the rear axle engagement gear ring 31 simultaneously.

[0037] At this time, the power is generated by the engine 22, and transmitted to the rear wheel 34 through the gearbox 21, rear drive shaft 23, rear axle drive gear 24, rear axle reducer driven gear 25, rear axle differential 26, rear axle output shaft 30, rear axle engagement gear ring 31, rear axle engagement sleeve 27, rear wheel half-shaft splined hub 28, and rear wheel half-shaft 29, thereby driving the rear wheel 34 forward or backward.

[0038] (3) Four-wheel drive mode The transmission controller 110 sends a gear position signal for R or D, which closes the contact switch in the drive relay 200 and opens the contact in the power take-off relay 140.

[0039] At this time, the power take-off switch 130, the water spray front drive switch 160, and the water spray rear drive switch 170 all fail, which can effectively protect the power take-off system and prevent damage to the power take-off unit caused by accidental activation.

[0040] When the front drive switch 190 is closed, the front axle motor 11 operates, and the front axle motor 11 pushes the front axle shift fork 12 to move. The front axle engagement sleeve 16 moves with the front axle shift fork 12, and the front axle engagement sleeve 16 engages with the front wheel half shaft spline hub 15 and the front axle engagement gear ring 18 simultaneously.

[0041] When the rear drive switch 210 is closed, the rear axle motor 33 operates, and the rear axle motor 33 pushes the rear axle shift fork 32 to move. The rear axle engagement sleeve 27 then moves with the rear axle shift fork 32, and the rear axle engagement sleeve 27 engages with the rear wheel half-shaft spline hub 28 and the rear axle engagement gear ring 31 simultaneously.

[0042] At this point, power is generated by engine 22, and part of it is transmitted to the front wheel 13 via gearbox 21, front drive shaft 20, front axle drive gear 19, front axle reducer driven gear 9, front axle differential 10, front axle output shaft 17, front axle engagement gear ring 18, front axle engagement sleeve 16, front wheel half-shaft splined hub 15, and front wheel half-shaft 14. The other part is transmitted to the rear wheel 34 via gearbox 21, rear drive shaft 23, rear axle drive gear 24, rear axle reducer driven gear 25, rear axle differential 26, rear axle output shaft 30, rear axle engagement gear ring 31, rear axle engagement sleeve 27, rear wheel half-shaft splined hub 28, and rear wheel half-shaft 29. At this time, the front wheel 13 and rear wheel 34 of the vehicle can move forward or backward simultaneously. 2. Water spray mode (1) Parking water spray The transmission controller 110 sends a W gear signal, the contacts in the power take-off relay 140 close, and the contacts in the drive relay 200 open.

[0043] The electronic parking controller 210 receives the W gear signal sent by the transmission controller 110, sends a parking signal, the electronic parking system is activated, and the vehicle is in parking status.

[0044] At this time, the rear drive switch 180 and the front drive switch 190 are disabled. The power take-off switch 130 is effective. The water spray front drive switch 160 and the water spray rear drive switch 170 can only be activated after the power take-off switch 130 is closed. This ensures that the vehicle is stationary when the power take-off system and water pump start working, ensuring operational safety and preventing equipment damage caused by incorrect operation.

[0045] When the water spray switch 130 is closed, the power take-off motor 6 starts working. The power take-off motor 6 pushes the power take-off shift fork 7 to move. The power take-off engagement sleeve 4 moves with the power take-off shift fork 7. The power take-off engagement sleeve 4 engages with the power take-off spline hub 3 and the power take-off engagement gear ring 5 at the same time.

[0046] At this time, the power is generated by the engine 22, and transmitted to the water pump 1 through the gearbox 21, the front drive shaft 20, the front axle drive gear 19, the front axle reducer driven gear 9, the power take-off gear 8, the power take-off engagement gear ring 5, the power take-off engagement sleeve 4, the power take-off spline hub 3, and the power take-off output shaft 2, and the water pump 1 starts to work.

[0047] (2) Front-end water spray The transmission controller 110 sends a W gear signal, the contacts in the power take-off relay 140 close, and the contacts in the drive relay 200 open.

[0048] The electronic parking controller 210 receives the W gear signal sent by the transmission controller 110, sends a parking signal, the electronic parking system is activated, and the vehicle is parked.

[0049] At this time, the rear drive switch 180 and the front drive switch 190 are disabled. The power take-off switch 130 is effective. The water spray front drive switch 160 and the water spray rear drive switch 170 can only be activated after the power take-off switch 130 is closed. This ensures that the vehicle is stationary when the power take-off system and water pump start working, ensuring operational safety and preventing damage to vehicle parts caused by incorrect operation.

[0050] When the water spray switch 130 is closed, the power take-off motor 6 starts working. The power take-off motor 6 pushes the power take-off shift fork 7 to move. The power take-off engagement sleeve 4 moves with the power take-off shift fork 7. The power take-off engagement sleeve 4 engages with the power take-off spline hub 3 and the power take-off engagement gear ring 5 at the same time.

[0051] When the water spray front drive switch 160 is closed again, the front axle motor 11 starts working, and the front axle motor 11 pushes the front axle shift fork 12 to move. The front axle engagement sleeve 16 moves with the front axle shift fork 12, and the front axle engagement sleeve 16 meshes with the front wheel half shaft spline hub 15 and the front axle engagement gear ring 18 at the same time.

[0052] At this point, power is generated by engine 22. Part of the power is transmitted to the front wheel 13 via gearbox 21, front drive shaft 20, front axle drive gear 19, front axle reducer driven gear 9, front axle differential 10, front axle output shaft 17, front axle engagement gear ring 18, front axle engagement sleeve 16, front wheel half-shaft splined hub 15, and front wheel half-shaft 14. The other part is transmitted to water pump 1 via gearbox 21, front drive shaft 20, front axle drive gear 19, front axle reducer driven gear 9, power take-off gear 8, power take-off engagement gear ring 5, power take-off engagement sleeve 4, power take-off splined hub 3, and power take-off output shaft 2, and water pump 1 begins to work.

[0053] When the parking switch 220 is operated, the electronic parking controller 210 receives the signal and releases the vehicle from the parking state. At this time, the front wheels 13 of the vehicle can move forward while the water pump 1 is working.

[0054] (3) Rear drive water jet The transmission controller 110 sends a W gear signal, the contacts in the power take-off relay 140 close, and the contacts in the drive relay 200 open.

[0055] The electronic parking controller 210 receives the W gear signal sent by the transmission controller 110, sends a parking signal, the electronic parking system is activated, and the vehicle is parked.

[0056] At this time, the rear drive switch 180 and the front drive switch 190 are disabled. The power take-off switch 130 is effective. The water spray front drive switch 160 and the water spray rear drive switch 170 can only be activated after the power take-off switch 130 is closed. This ensures that the vehicle is stationary when the power take-off system and water pump start working, ensuring operational safety and preventing damage to vehicle parts caused by incorrect operation.

[0057] When the water spray switch 130 is closed, the power take-off motor 6 starts working. The power take-off motor 6 pushes the power take-off shift fork 7 to move. The power take-off engagement sleeve 4 moves with the power take-off shift fork 7. The power take-off engagement sleeve 4 engages with the power take-off spline hub 3 and the power take-off engagement gear ring 5 at the same time.

[0058] When the water spray rear drive switch 170 is closed again, the rear axle motor 33 starts working. The rear axle motor 33 pushes the rear axle shift fork 32 to move. The rear axle engagement sleeve 27 moves with the rear axle shift fork 32, and the rear axle engagement sleeve 27 meshes with the rear wheel half shaft spline hub 28 and the rear axle engagement gear ring 31 at the same time.

[0059] At this point, power is generated by engine 22. Part of the power is transmitted to the rear wheel 34 via gearbox 21, rear drive shaft 23, rear axle drive gear 24, rear axle reducer driven gear 25, rear axle differential 26, rear axle output shaft 30, rear axle engagement gear ring 31, rear axle engagement sleeve 27, rear wheel half-shaft splined hub 28, and rear wheel half-shaft 29. The other part is transmitted to water pump 1 via gearbox 21, front drive shaft 20, front axle drive gear 19, front axle reducer driven gear 9, power take-off gear 8, power take-off engagement gear ring 5, power take-off engagement sleeve 4, power take-off splined hub 3, and power take-off output shaft 2, and water pump 1 begins to work.

[0060] When the parking switch 220 is operated, the electronic parking controller 210 receives the signal and releases the vehicle from the parking state. At this time, the rear wheels 34 of the vehicle can move forward while the water pump 1 is working.

[0061] (4) Four-wheel drive water spray The transmission controller 110 sends a W gear signal, the contacts in the power take-off relay 140 close, and the contacts in the drive relay 200 open.

[0062] The electronic parking controller 210 receives the W gear signal sent by the transmission controller 110, sends a parking signal, the electronic parking system is activated, and the vehicle is parked.

[0063] At this time, the rear drive switch 180 and the front drive switch 190 are disabled. The power take-off switch 130 is effective. The water spray front drive switch 160 and the water spray rear drive switch 170 can only be activated after the power take-off switch 130 is closed. This ensures that the vehicle is stationary when the power take-off system and water pump start working, ensuring operational safety and preventing damage to vehicle parts caused by incorrect operation.

[0064] When the water spray switch 130 is closed, the power take-off (PTO) motor 6 operates, driving the PTO shift fork 7 to move. The PTO engagement sleeve 4 moves with the PTO shift fork 7, simultaneously engaging with the PTO splined hub 3 and the PTO engagement gear ring 5. When the water spray front drive switch 160 is closed again, the front axle motor 11 starts working, and the front axle motor 11 pushes the front axle shift fork 12 to move. The front axle engagement sleeve 16 moves with the front axle shift fork 12, and the front axle engagement sleeve 16 meshes with the front wheel half shaft spline hub 15 and the front axle engagement gear ring 18 at the same time.

[0065] When the water spray rear drive switch 170 is closed again, the rear axle motor 33 starts working. The rear axle motor 33 pushes the rear axle shift fork 32 to move. The rear axle engagement sleeve 27 moves with the rear axle shift fork 32, and the rear axle engagement sleeve 27 meshes with the rear wheel half shaft spline hub 28 and the rear axle engagement gear ring 31 at the same time.

[0066] At this point, power is generated by engine 22, and part of it is transmitted to the front wheel 13 via gearbox 21, front drive shaft 20, front axle drive gear 19, front axle reducer driven gear 9, front axle differential 10, front axle output shaft 17, front axle engagement gear ring 18, front axle engagement sleeve 16, front wheel half-shaft splined hub 15, and front wheel half-shaft 14. Part of it is transmitted to the rear wheel 34 via gearbox 21, rear drive shaft 23, rear axle drive gear 24, rear axle reducer driven gear 25, rear axle differential 26, rear axle output shaft 30, rear axle engagement gear ring 31, rear axle engagement sleeve 27, rear wheel half-shaft splined hub 28, and rear wheel half-shaft 29. The final part is transmitted through the gearbox 21, front drive shaft 20, front axle drive gear 19, front axle reducer driven gear 9, power take-off gear 8, power take-off engagement gear ring 5, power take-off engagement sleeve 4, power take-off splined hub 3, and power take-off output shaft 2 to the water pump 1, and the water pump 1 starts to work.

[0067] When the parking switch 220 is operated, the electronic parking controller 210 receives the signal and releases the vehicle from the parking state. At this time, the front wheels 13 and rear wheels 34 of the vehicle can move forward simultaneously while the water pump 1 is working.

[0068] The power take-off system of the all-terrain fire truck water pump of the present invention is connected to the vehicle's main reducer and the power comes from the engine. It can adapt to various working conditions, has a compact layout, solves the problem of cargo box occupation, and has independent forward, reverse and working gears. It can avoid accidental activation of the power take-off switch, resulting in operation errors or damage to the power take-off system, thus improving the safety of the system.

[0069] Obviously, the embodiments described above are only some embodiments of this application, and not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application.

Claims

1. A control circuit applied to an all-terrain fire truck water pump power take-off system, characterized in that, The control circuit includes a power link (P) and a ground link (N). The power link (P) includes a first power terminal (P1) and a second power terminal (P2). The ground link (N) includes a first ground terminal (N1) and a second ground terminal (N2). The first electrical terminal (P1) is connected to the first common terminal (P3) sequentially via the power take-off switch (130), the contact switch of the power take-off relay (140), and the power take-off motor (6). The first common terminal (P3) is connected to the second common terminal (P4) via the water spray front drive switch (160), the front axle motor (11), and the front drive switch (190). The first common terminal (P3) is electrically connected to the second common terminal (P4) via the water spray rear drive switch (170), the rear axle motor (33), and the rear drive switch (180). The second common pole (P4) is electrically connected to the second energized terminal (P2) after being switched by the contact switch of the drive relay (200). The first grounding terminal (N1) is electrically connected to the second grounding terminal (N2) after passing through the coil of the power take-off relay (140), the gearbox controller (110), and the drive relay (200). The transmission controller (110) is electrically connected to the electronic parking brake controller (210), and the electronic parking brake controller (210) is electrically connected to the parking switch (220). The power take-off relay (140) and drive relay (200) are opened or closed based on the gear position signal from the gearbox controller (110). When the all-terrain fire truck is in front-wheel drive mode, rear-wheel drive mode, or four-wheel drive mode, the contact switch of the drive relay (200) is closed, and the contact switch of the power take-off relay (140) is open. When the all-terrain fire truck is in parking spray mode, rear-wheel drive spray mode, or four-wheel drive spray mode, the contact switch of the drive relay (200) is open, and the contact switch of the power take-off relay (140) is closed. in, The all-terrain fire truck water pump power take-off system includes a front drive assembly (S1), a power source assembly (S2), and a rear drive assembly (S3). The front drive assembly (S1) is equipped with a water pump power take-off unit (S11). The front drive assembly (S1) includes a front axle motor (11), which independently controls the on / off state of power transmission between the power source assembly (S2) and the front drive assembly (S1). The power take-off unit (S11) of the water pump includes a power take-off motor (6), which independently controls the on / off of power transmission between the power source assembly (S2) and the power take-off unit (S11). The rear drive assembly (S3) includes a rear axle motor (33), which independently controls the on / off state of power transmission between the power source assembly (S2) and the rear drive assembly (S3). The front drive assembly (S1) comprises, in sequence according to the direction of power transmission, a front drive shaft (20), a front axle drive gear (19), a front axle reducer driven gear (9), a front axle differential (10), a front axle output shaft (17), a front axle engagement gear ring (18), a front axle engagement sleeve (16), a front wheel half-shaft splined hub (15), a front wheel half-shaft (14), and a front wheel (13). The front axle motor (11) drives the front axle shift fork (12) to move. The front axle shift fork (12) controls the front axle engagement sleeve (16), causing the front axle engagement sleeve (16) to engage or disengage synchronously with the front wheel half-shaft splined hub (15) and the front axle engagement gear ring (18). The power take-off unit (S11) includes a power take-off gear (8), a power take-off engagement gear ring (5), a power take-off engagement sleeve (4), a power take-off splined hub (3), a power take-off output shaft (2), and a water pump (1). The power take-off motor (6) drives the power take-off shift fork (7) to move. The power take-off shift fork (7) controls the power take-off engagement sleeve (4), causing the power take-off engagement sleeve (4) to engage or disengage synchronously with the power take-off splined hub (3) and the power take-off engagement gear ring (5). The rear drive assembly (S3) comprises, in sequence according to the direction of power transmission, a rear drive shaft (23), a rear axle drive gear (24), a rear axle reducer driven gear (25), a rear axle differential (26), a rear axle output shaft (30), a rear axle engagement gear ring (31), a rear axle engagement sleeve (27), a rear wheel half-shaft splined hub (28), a rear wheel half-shaft (29), and a rear wheel (34). The rear axle motor (33) drives the rear axle shift fork (32) to move. The rear axle shift fork (32) controls the rear axle engagement sleeve (27), causing the rear axle engagement sleeve (27) to engage or disengage synchronously with the rear wheel half-shaft splined hub (28) and the rear axle engagement gear ring (31). The power source assembly (S2) includes an engine (22) and a gearbox (21).

2. The control circuit applied to the all-terrain fire fighting truck water pump power take-off system according to claim 1, characterized in that, The gear position signals include five gear position signals: parking, neutral, reverse, forward, and water spray.

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