Power takeoff transmission case of engineering vehicle and power takeoff method of hydraulic operating system

Abstract

A power take-off transmission case of an engineering vehicle comprises a case body, a mechanical input shaft, an electric drive input shaft and an output shaft are installed in the case body, and the mechanical input shaft and the output shaft are coaxially aligned, and is characterized in that a coaxial gear assembly coaxially fixed to the mechanical input shaft, a speed reduction assembly connected with the electric drive input shaft and a gear shifting assembly assembled on the output shaft are further installed in the case body; the gear shifting assembly is located between the coaxial gear assembly and the speed reduction assembly and can move in the axial direction to be matched with the coaxial gear assembly or the speed reduction assembly, the gear shifting assembly is matched with the coaxial gear assembly to enable the mechanical input shaft to be in transmission connection with the output shaft, and the gear shifting assembly is matched with the speed reduction assembly to enable the electric drive input shaft to be in transmission connection with the output shaft. When motor transmission power take-off is carried out, the transmission does not need to be put into a neutral gear, and the power take-off transmission safety and the power switching reliability are improved. The invention further provides a power take-off method of the engineering vehicle hydraulic operation system.

Description

Technical Field

[0001] The invention relates to a power take-off transmission box of an engineering vehicle, belonging to the technical field of engineering vehicles. The invention also relates to a power take-off method of a hydraulic operating system of an engineering vehicle. Background Art

[0002] With the continuous development of the automobile industry, some engineering vehicles have functions such as lifting, pumping, and tipping. The realization of these functions requires power to be provided to their hydraulic operating systems. These power acquisition methods are generally directly derived from the vehicle power. It is necessary to add a power take-off transmission structure to the gearbox of the vehicle chassis to transmit the power to the hydraulic operating mechanism. The power take-off transmission structure can connect or disconnect the power as needed. However, if the power take-off transmission structure only takes power from the gearbox, it will lead to an increase in vehicle fuel consumption and exhaust emissions. In order to meet the needs of energy conservation and environmental protection, the drive motor and the gearbox are respectively connected to the power take-off transmission structure to form a hybrid transmission for the hydraulic operating system to reduce the use cost and reduce engine emissions. However, the hybrid power take-off transmission has the following defects: 1. The power take-off shaft of the gearbox is connected to the working oil pump of the hydraulic operation system. When the gearbox is not switched to neutral, the motor transmission will back-drag the gearbox. Therefore, the gearbox needs to be in neutral when the motor transmission is taking power. When taking power, not only the gear of the power take-off transmission needs to be switched, but the gearbox also needs to be shifted to neutral. This is inconvenient to operate and increases the risk of the gearbox being back-drag driven.

[0003] 2. The motor transmission has a small torque transmission and cannot adapt well to the torque requirements under working conditions, which limits the application scenarios of motor transmission power taking. In addition, the switching structure of the motor transmission and the gearbox transmission is complex, and there is a risk of power taking failure due to inadequate switching.

[0004] 3. The gears inside the power take-off transmission are mostly lubricated by splash lubrication, which has a general lubrication effect and causes accelerated wear of the internal gears. If an electronic oil pump and a mechanical gear pump are used for active lubrication, the oil pump needs to be connected to an external drive device, which not only complicates the connection structure but also increases the spatial volume of the power take-off transmission structure, which is not conducive to the spatial layout of the vehicle chassis. Summary of the invention

[0005] The power take-off transmission box of the engineering vehicle provided by the present invention realizes the switching between the motor-driven power take-off and the transmission-driven power take-off. When the motor-driven power take-off is performed, it is not necessary to put the transmission in neutral, thereby improving the safety of the power take-off transmission and the reliability of the power switching, improving the reliability of the motor-driven power take-off, and increasing the application scenarios of the motor-driven power take-off. When the transmission-driven power take-off and the motor-driven power take-off are performed, the lubrication gear pump can be driven to operate, ensuring the lubrication of various components in the box. The lubrication gear pump has a simple assembly structure and does not occupy the external space of the box, which is beneficial to the space layout of the vehicle chassis. The present invention also provides a power take-off method of the hydraulic operation system of an engineering vehicle.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: A power take-off transmission box for an engineering vehicle comprises a box body, in which a mechanical input shaft connected to the power take-off output end of a transmission, an electric drive input shaft connected to a plug-in drive motor, and an output shaft connected to a working oil pump of a hydraulic operation system are mounted, the mechanical input shaft is coaxially aligned with the output shaft, and the box body is characterized in that: the box body is also equipped with a coaxial gear assembly coaxially fixed with the mechanical input shaft, a reduction assembly connected to the electric drive input shaft, and a shift assembly assembled on the output shaft, the shift assembly is located between the coaxial gear assembly and the reduction assembly, and can move axially to form a match with the coaxial gear assembly or the reduction assembly, the shift assembly cooperates with the coaxial gear assembly to drive and connect the mechanical input shaft with the output shaft, and the shift assembly cooperates with the reduction assembly to drive and connect the electric drive input shaft with the output shaft.

[0007] Preferably, the coaxial gear assembly includes an idler shaft, a rotating sleeve coaxially fixed with the mechanical input shaft, and a mating gear that can cooperate with the shift assembly. The rotating sleeve and the mating gear are coaxially fixed at both ends of the idler shaft, respectively, and the idler shaft is rotatably assembled on the output shaft.

[0008] Preferably, the reduction assembly includes a primary driving gear coaxially fixed with the electric drive input shaft, a primary driven gear meshing with the primary driving gear, a secondary driving gear coaxially fixed with the primary driven gear, a secondary driven gear meshing with the secondary driving gear, an idler shaft 2 coaxially fixed with the secondary driven gear, and a matching gear 2 that can cooperate with the shift assembly, the matching gear 2 is coaxially fixed on the idler shaft 2, and the idler shaft 2 is rotatably assembled on the output shaft.

[0009] Preferably, the mating gear 1 and the mating gear 2 are arranged on both sides of the shift assembly and have equal outer diameters, the output shaft passes through the idler shaft 2 and extends into the idler shaft 1, and is supported in the idler shaft sleeve 1 and the idler shaft 2 by bearings.

[0010] Preferably, the shift assembly includes a shift gear coaxially fixed on the output shaft and a sliding gear sleeve sleeved on the shift gear and slidably matched with the shift gear. The shift gear and the sliding gear are arranged between mating gear one and mating gear two. The sliding gear sleeve slides axially on the shift gear to match with mating gear one or mating gear two.

[0011] Preferably, the electric drive input shaft is parallel to the output shaft, and the primary driven gear and the secondary driving gear are coaxially fixed via an intermediate shaft parallel to the output shaft and the electric drive input shaft.

[0012] Preferably, the output shaft is arranged at the bottom of the box, an active lubricating oil channel for actively lubricating the components inside the box is opened in the box, a lubricating gear pump connected to the active lubricating oil channel is installed in the box, and the active gear of the lubricating gear pump is assembled on the output shaft.

[0013] The power taking method of the hydraulic operation system of an engineering vehicle adopts the power taking transmission box of the engineering vehicle described above, and is characterized in that: under the working condition of a plug-in power supply, the shift assembly is matched with the reduction assembly to form a transmission connection between the electric drive input shaft and the shift assembly, and the output power of the plug-in drive motor is transmitted to the working oil pump via the electric drive input shaft, the reduction assembly, the shift assembly and the output shaft to drive the hydraulic operation system to operate; under the working condition of no plug-in power supply, the shift assembly is matched with the coaxial gear assembly to form a transmission connection between the mechanical input shaft and the shift assembly, and the output power of the transmission is transmitted to the working oil pump via the mechanical input shaft, the coaxial gear assembly, the shift assembly and the output shaft to drive the hydraulic operation system to operate.

[0014] The beneficial effects of the invention are: The power take-off transmission box of the engineering vehicle of the present invention has a mechanical input shaft connected to the power take-off output end of the transmission and coaxially fixed with the coaxial gear assembly, an electric drive input shaft connected to the plug-in drive motor and connected to the reduction assembly, and a shift assembly located between the coaxial gear assembly and the reduction assembly is assembled on the output shaft. When the shift assembly cooperates with the coaxial gear assembly, the mechanical input shaft is connected to the output shaft in a driving manner, and the power of the transmission is transmitted to the working oil pump, driving the hydraulic operating system to operate, forming a transmission power take-off. When the shift assembly cooperates with the reduction assembly, the electric drive input shaft is connected to the output shaft in a driving manner, and the power of the plug-in drive motor is transmitted to the working oil pump, driving the hydraulic operating system to operate, forming a motor transmission power take-off, through The movement of the shift assembly is used to switch the power source, realizing the switching between the motor-driven power take-off and the transmission-driven power take-off. The mechanical input shaft and the output shaft are separated by the shift assembly. When the shift assembly cooperates with the reduction assembly, the transmission connection between the mechanical input shaft and the output shaft is disconnected to prevent the output shaft from driving the transmission through the input shaft when the motor-driven power take-off is in progress. When the motor-driven power take-off is in progress, there is no need to put the transmission in neutral, thereby improving the safety of the power take-off transmission and the reliability of power switching. When the motor-driven power take-off is in progress, the reduction assembly effectively reduces the speed and increases the torque of the output torque of the plug-in drive motor, so that the hydraulic operation system can adapt well to the torque requirements under the working conditions, improve the reliability of the motor-driven power take-off, and increase the application scenarios of the motor-driven power take-off.

[0015] A lubrication gear pump is fixed on the output shaft to pump the oil at the bottom of the box to the active lubrication oil channel in the box, thereby actively lubricating the gears and bearings in the box. The lubrication gear pump can be driven to operate when the transmission takes off power and the motor takes off power, thereby ensuring the lubrication of various components in the box. The lubrication gear pump does not require external drive equipment and is arranged in the box. The assembly structure is simple and does not occupy the external space of the box, which is beneficial to the space layout of the vehicle chassis. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1The figure is a transmission principle diagram of the power take-off transmission box of the engineering vehicle of the present invention.

[0017] Figure 2 This is the transmission structure diagram inside the box. DETAILED DESCRIPTION

[0018] Combine the following Figure 1~2 The embodiments of the present invention are described in detail.

[0019] The power take-off transmission box of an engineering vehicle includes a box body 10, in which a mechanical input shaft 1 connected to the power take-off output end of a transmission 4, an electric drive input shaft 2 connected to a plug-in drive motor 5, and an output shaft 3 connected to a working oil pump 6 of a hydraulic operation system are installed. The mechanical input shaft 1 is coaxially aligned with the output shaft 3, and is characterized in that: the box body is also equipped with a coaxial gear assembly 7 coaxially fixed with the mechanical input shaft 1, a reduction assembly 8 connected to the electric drive input shaft 2, and a shift assembly 9 assembled on the output shaft 3. The shift assembly 9 is located between the coaxial gear assembly 7 and the reduction assembly 8, and can move axially to form a match with the coaxial gear assembly 7 or the reduction assembly 8. The shift assembly 9 cooperates with the coaxial gear assembly 7 to drive the mechanical input shaft 1 to the output shaft 3, and the shift assembly 9 cooperates with the reduction assembly 8 to drive the electric drive input shaft 2 to the output shaft 3.

[0020] In the power take-off transmission box of the engineering vehicle described above, the mechanical input shaft 1 is connected to the power take-off output end of the transmission 4 and is coaxially fixed with the coaxial gear assembly 7, the electric drive input shaft 2 is connected to the plug-in drive motor 5 and is connected to the reduction assembly 8, and the output shaft 3 is equipped with a shift assembly 9 located between the coaxial gear assembly 7 and the reduction assembly 8. When the shift assembly 9 cooperates with the coaxial gear assembly 7, the mechanical input shaft 1 is connected to the output shaft 3 in a transmission manner, and the power of the transmission 4 is transmitted to the working oil pump 6, driving the hydraulic operating system to operate, forming a transmission power take-off. When the shift assembly 9 cooperates with the reduction assembly 8, the electric drive input shaft 2 is connected to the output shaft 3 in a transmission manner, and the power of the plug-in drive motor 5 is transmitted to the working oil pump 6, driving the hydraulic operating system to operate, forming a motor transmission. Dynamic power take-off, switching the power source through the movement of the shift assembly 9, realizing the switching between motor-driven power take-off and transmission-driven power take-off, the shift assembly 9 is used to separate the mechanical input shaft 1 and the output shaft 3, and the transmission connection between the mechanical input shaft 1 and the output shaft 3 is disconnected when the shift assembly 9 cooperates with the reduction assembly 8, to prevent the output shaft 3 from dragging the transmission through the input shaft 1 when the motor is driven to take off power, and there is no need to put the transmission in neutral when the motor is driven to take off power, thereby improving the safety of the power take-off transmission and the reliability of power switching; when the motor is driven to take off power, the reduction assembly 8 effectively reduces the speed and increases the torque of the output torque of the plug-in drive motor 5, so that the hydraulic operation system can well adapt to the torque requirements under the working conditions, improve the reliability of the motor-driven power take-off, and increase the application scenarios of the motor-driven power take-off.

[0021] Among them, the coaxial gear assembly 7 includes an idler shaft 71, a rotating sleeve 72 coaxially fixed with the mechanical input shaft 71, and a matching gear 73 that can cooperate with the shift assembly 9. The rotating sleeve 72 and the matching gear 73 are coaxially fixed at both ends of the idler shaft 71, respectively, and the idler shaft 71 can be rotatably assembled on the output shaft 3. The power take-off output end of the transmission 1 drives the mechanical input shaft 1 for transmission, and the mechanical input shaft 1 drives the rotating shaft sleeve 72, the idler shaft 71 and the matching gear 73 to rotate synchronously. When the shift assembly 9 does not cooperate with the matching gear 73, the matching gear 73 cannot transmit the power to the output shaft 3 through the shift assembly 9. At this time, the mechanical input shaft 1 and the output shaft 3 are in a disconnected state, and the output power of the transmission cannot be transmitted to the working oil pump 6. Only when the shift assembly 9 moves to cooperate with the matching gear 73 can the transmission connection between the mechanical input shaft 1 and the output shaft 3 be formed, and the matching gear 73 transmits the power to the output shaft 3 through the shift assembly 9. The output shaft 3 drives the working oil pump 6 to start, drives the hydraulic operation system to operate, and realizes the transmission power take-off. Therefore, when the shift assembly 9 does not cooperate with the matching gear 73, the output shaft 3 and the mechanical input shaft 1 are in a disconnected state, and the rotation of the output shaft 3 will not drive the mechanical input shaft to rotate, and will not form a reverse drag on the transmission. When the motor transmission takes power, there is no need to put the transmission in neutral, which saves the operation of putting the transmission in neutral, and improves the convenience and safety of power switching.

[0022] The deceleration assembly 8 includes a primary driving gear 81 coaxially fixed with the electric drive input shaft 2, a primary driven gear 82 meshing with the primary driving gear 81, a secondary driving gear 83 coaxially fixed with the primary driven gear 82, a secondary driven gear 84 meshing with the secondary driving gear 83, an idler shaft 85 coaxially fixed with the secondary driven gear 84, and a matching gear 86 that can be matched with the shift assembly 9, the matching gear 86 is coaxially fixed on the idler shaft 85, and the idler shaft 85 is rotatably assembled on the output shaft 3. The deceleration assembly 8 includes two-stage deceleration, and the output power of the plug-in drive motor 5 is decelerated and torque-increased before being transmitted to the matching gear 86. When the shift assembly 9 moves to match the matching gear 86, the output power of the plug-in drive motor 5 is transmitted to the output shaft 3 via the output shaft 2 2, the deceleration assembly 3, and the shift assembly 9. The output shaft 3 drives the working oil pump 6 to start, drives the hydraulic operation system to operate, and realizes the motor transmission power take-off.

[0023] The mating gear 1 73 and the mating gear 2 86 are arranged on both sides of the shift assembly 9 and have the same outer diameters. The output shaft 3 passes through the idler shaft 2 85 and extends into the idler shaft 1 71, and is supported in the idler shaft sleeve 1 85 and the idler shaft 2 71 through bearings. The shift assembly 9 is located between the mating gear 1 73 and the mating gear 2 86, and the mating gear 1 73 and the mating gear 2 86 have the same outer diameters, ensuring that the shift assembly 9 can be mated with both the mating gear 1 73 and the mating gear 2 86, and the axial movement of the shift assembly 9 realizes the switching of the motor transmission power take-off and the transmission transmission power take-off.

[0024] Among them, the shift assembly 9 includes a shift gear 91 coaxially fixed on the output shaft 3 and a sliding gear sleeve 92 that is sleeved on the shift gear 91 and slidably matched with the shift gear 91. The shift gear 91 and the sliding gear 92 are arranged between the mating gear 1 73 and the mating gear 2 86. The sliding gear sleeve 92 slides axially on the shift gear 91 and cooperates with the mating gear 1 73 or the mating gear 2 83. As can be seen from the accompanying drawings, the shift gear 91 is fixed to the output shaft 3, and the sliding gear sleeve 92 is sleeved on the shift gear 91 and will rotate synchronously with the shift gear 91. When the sliding gear 92 slides to the left on the shift gear 91 and cooperates with the matching gear 2 86, a transmission connection is formed between the mechanical input shaft 1 and the output shaft 3, and the output power of the transmission 4 is transmitted to the working oil pump 6 to drive the hydraulic operating system to operate. At this time, the electric drive input shaft 2 is disconnected from the output shaft 3, and the power of the plug-in drive motor 5 cannot be transmitted to the output shaft 3. When the sliding gear 92 slides to the right on the shift gear 91 and cooperates with the matching gear 1 73, a transmission connection is formed between the electric drive input shaft 2 and the output shaft 3, and the output power of the plug-in drive motor 5 is transmitted to the working oil pump 6 to drive the hydraulic operating system to operate. At this time, the mechanical input shaft 1 is disconnected from the output shaft 3, and the output power of the transmission cannot be transmitted to the output shaft 3, and the rotation of the output shaft 3 will not cause reverse drag on the transmission 4.

[0025] The electric drive input shaft 2 is parallel to the output shaft 3, and the primary driven gear 82 and the secondary driving gear 83 are coaxially fixed through an intermediate shaft 11 arranged parallel to the output shaft 3 and the electric drive input shaft 2. The primary driven gear 82 and the secondary driving gear 83 are supported by the intermediate shaft 11 to ensure the structural stability of the reduction assembly 8, and the primary driven gear 82 and the secondary driving gear 83 of corresponding diameters are assembled on the intermediate shaft 11 according to the requirements of the reduction and torque increase of the reduction assembly 8 to improve the speed ratio.

[0026] The output shaft 3 is arranged at the bottom of the housing 10, and an active lubricating oil passage for actively lubricating the components in the housing is provided in the housing 10. A lubricating gear pump 12 connected to the active lubricating oil passage is installed in the housing, and the active gear of the lubricating gear pump 12 is assembled on the output shaft. The lubricating gear pump 12 cooperates with the output shaft 3 and is also located at the bottom of the housing. The lubricating gear pump 12 is connected to the active lubricating oil passage in the housing. When the output shaft 3 rotates, the lubricating gear pump 12 rotates synchronously, and the oil at the bottom of the housing is pumped into the active lubricating oil passage in the housing, so as to actively lubricate the gears and bearings in the housing. The lubricating gear pump 12 is connected to the output shaft 3, and can drive the lubricating gear pump 12 to run when the transmission takes off the power and the motor takes off the power, so as to ensure the lubrication of the components in the housing 10. The lubricating gear pump 12 does not need to be driven by an external driving device and is arranged in the housing. The assembly structure is simple, and it does not occupy the external space of the housing, which is conducive to the space layout of the vehicle chassis.

[0027] The present invention also protects a power-taking method for a hydraulic operating system of an engineering vehicle, which adopts the power-taking transmission box of the engineering vehicle described above, and is characterized in that: under the working condition of a plug-in power supply, the shift assembly 9 is matched with the reduction assembly 8 to form a transmission connection between the electric drive input shaft 2 and the shift assembly 9, and the output power of the plug-in drive motor 5 is transmitted to the working oil pump 6 via the electric drive input shaft 2, the reduction assembly 8, the shift assembly 9 and the output shaft 3 to drive the hydraulic operating system to operate; under the working condition of no plug-in power supply, the shift assembly 8 is matched with the coaxial gear assembly 7 to form a transmission connection between the mechanical input shaft 1 and the shift assembly 8, and the output power of the transmission is transmitted to the working oil pump 3 via the mechanical input shaft 1, the coaxial gear assembly 7, the shift assembly 8 and the output shaft 3 to drive the hydraulic operating system to operate.

[0028] In the above-mentioned power taking method, when the shift assembly 9 cooperates with the coaxial gear assembly 7, the mechanical input shaft 1 is connected with the output shaft 3, and the power of the transmission 4 is transmitted to the working oil pump 6, driving the hydraulic operating system to operate, forming the transmission transmission power taking; when the shift assembly 9 cooperates with the reduction assembly 8, the electric drive input shaft 2 is connected with the output shaft 3, and the power of the plug-in drive motor 5 is transmitted to the working oil pump 6, driving the hydraulic operating system to operate, forming the motor transmission power taking, and the power source is switched by the movement of the shift assembly 9 to realize the switching between the motor transmission power taking and the transmission transmission power taking. The output shafts 3 are separated by a shift assembly 9, and the transmission connection between the mechanical input shaft 1 and the output shaft 3 is disconnected when the shift assembly 9 cooperates with the reduction assembly 8, to prevent the output shaft 3 from dragging the transmission through the input shaft 1 when the motor is driving the power. There is no need to put the transmission in neutral when the motor is driving the power, thereby improving the safety of the power transmission and the reliability of power switching. When the motor is driving the power, the reduction assembly 8 effectively reduces the speed and increases the torque of the output torque of the plug-in drive motor 5, so that the hydraulic operating system can adapt well to the torque requirements under the operating conditions, improve the reliability of the motor driving the power, and increase the application scenarios of the motor driving the power.

[0029] The above is a complete description of the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

Claims

1. A power take-off transmission box for an engineering vehicle, comprising a box body, in which a mechanical input shaft connected to a power take-off output end of a transmission, an electric drive input shaft connected to a plug-in drive motor, and an output shaft connected to a working oil pump of a hydraulic operation system are installed, the mechanical input shaft and the output shaft are coaxially aligned, and the characteristics are: The housing is also equipped with a coaxial gear assembly coaxially fixed with the mechanical input shaft, a reduction assembly connected with the electric drive input shaft, and a shift assembly assembled on the output shaft. The shift assembly is located between the coaxial gear assembly and the reduction assembly, and can move axially to form a match with the coaxial gear assembly or the reduction assembly. The shift assembly cooperates with the coaxial gear assembly to drive the mechanical input shaft to the output shaft, and the shift assembly cooperates with the reduction assembly to drive the electric drive input shaft to the output shaft.

2. The power take-off transmission box for an engineering vehicle according to claim 1, characterized in that: The coaxial gear assembly includes an idler shaft, a rotating sleeve coaxially fixed with the mechanical input shaft, and a matching gear that can cooperate with the shift assembly. The rotating sleeve and the matching gear are coaxially fixed at both ends of the idler shaft, and the idler shaft is rotatably assembled on the output shaft.

3. The power take-off transmission box for an engineering vehicle according to claim 2, characterized in that: The reduction assembly includes a primary driving gear coaxially fixed with the electric drive input shaft, a primary driven gear meshing with the primary driving gear, a secondary driving gear coaxially fixed with the primary driven gear, a secondary driven gear meshing with the secondary driving gear, an idler shaft 2 coaxially fixed with the secondary driven gear, and a matching gear 2 that can cooperate with the shift assembly, the matching gear 2 is coaxially fixed on the idler shaft 2, and the idler shaft 2 is rotatably assembled on the output shaft.

4. The power take-off transmission box for an engineering vehicle according to claim 3, characterized in that: The mating gear 1 and the mating gear 2 are arranged on both sides of the shift assembly and have equal outer diameters. The output shaft passes through the idler shaft 2 and extends into the idler shaft 1, and is supported in the idler shaft sleeve 1 and the idler shaft 2 through bearings.

5. The power take-off transmission box for an engineering vehicle according to claim 4, characterized in that: The shift assembly includes a shift gear coaxially fixed on the output shaft and a sliding gear sleeve sleeved on the shift gear and slidably matched with the shift gear. The shift gear and the sliding gear are arranged between the mating gear one and the mating gear two. The sliding gear sleeve slides axially on the shift gear and cooperates with the mating gear one or the mating gear two.

6. The power take-off transmission box for an engineering vehicle according to claim 3, characterized in that: The electric drive input shaft is parallel to the output shaft, and the primary driven gear and the secondary driving gear are coaxially fixed via an intermediate shaft arranged parallel to the output shaft and the electric drive input shaft.

7. The power take-off transmission box for an engineering vehicle according to claim 1, characterized in that: The output shaft is arranged at the bottom of the box body, an active lubricating oil channel for actively lubricating the components inside the box is opened in the box body, a lubricating gear pump connected to the active lubricating oil channel is installed in the box body, and the active gear of the lubricating gear pump is assembled on the output shaft.

8. A power take-off method for a hydraulic operation system of an engineering vehicle, using the power take-off transmission box of an engineering vehicle according to any one of claims 1 to 7, characterized in that: When there is a plug-in power supply, the shift assembly is matched with the reduction assembly to form a transmission connection between the electric drive input shaft and the shift assembly. The output power of the plug-in drive motor is transmitted to the working oil pump via the electric drive input shaft, the reduction assembly, the shift assembly and the output shaft to drive the hydraulic operation system to operate; when there is no plug-in power supply, the shift assembly is matched with the coaxial gear assembly to form a transmission connection between the mechanical input shaft and the shift assembly. The output power of the transmission is transmitted to the working oil pump via the mechanical input shaft, the coaxial gear assembly, the shift assembly and the output shaft to drive the hydraulic operation system to operate.

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