Input type power split hybrid tractor gearbox

Abstract

The invention relates to an input type power split hybrid tractor gearbox. An engine output shaft of an input type power split stepless speed change system is connected with a planet carrier, and a sun gear is connected with a rotating shaft of a power generator; a rotating shaft of a driving motor is connected with the gear ring, a walking driving gear of a walking driving set is connected to a planet carrier hollow shaft, a walking driven gear is connected to a walking output shaft, and the walking driving gear is constantly meshed with the walking driven gear. A driving driven gear of the four-wheel driving power set is connected to the four-wheel driving output shaft, and the four-wheel driving driven gear is constantly meshed with the walking driven gear. A PTO output shaft of the engine direct-drive output system is connected with the output penetrating shaft, and a hydraulic driving gear of the hydraulic pump driving set is connected to the PTO output shaft. The walking stepless speed change control system has the advantages of being high in integration, compact in structure, simple in transmission, capable of guaranteeing independent and stable power performance of high-power power output, hydraulic pump drive and four-wheel drive output while stably controlling walking stepless speed change, and capable of effectively reducing production and use cost.

Description

TECHNICAL FIELD

[0001] The application relates to an input type power split hybrid tractor gearbox and belongs to the technical field of tractor gearboxes. BACKGROUND

[0002] A wheeled tractor is mainly used for field work. With the advantages of energy saving and power performance, a hybrid tractor gradually becomes a new direction of industry development. An existing hybrid power system adopts an engine, a generator, an electric motor and a planetary gear mechanism. The engine drives the generator to work, converts part of mechanical energy into electric power, the generator provides electric energy for the electric motor, and the electric energy is converted into mechanical energy. However, the technical scheme is directly transplanted from an automatic vehicle platform, so that driving power is improved for the wheels, and the special needs of a medium and large power tractor for multiple power outputs cannot be fully considered.

[0003] As disclosed in CN214450249U, a double-mode power split and flow stepless speed change transmission system includes the following: an engine output shaft is fixedly connected with a generator rotor, concentrically passes through an electric motor output hollow shaft, and is fixedly connected with a planetary gear set gear shaft; an electric motor rotor is fixedly connected with a clutch C1 input disc and a planetary gear set sun gear shaft through an electric motor output hollow shaft; a planetary gear set carrier hollow shaft is fixedly connected with a planetary gear set carrier; a power output shaft is fixedly connected with the planetary gear set gear shaft after concentrically passing through the planetary gear set carrier hollow shaft; a clutch C1 output disc is fixedly connected with an electric motor output Z1 gear; a planetary gear set carrier output Z3 gear is fixedly connected with the planetary gear set carrier hollow shaft; an electromechanical power flow shaft is fixedly connected with an electric motor output Z2 gear and a clutch C2 output disc; and a planetary gear set carrier output Z4 driven gear is fixedly connected with a clutch C2 input disc. The engine power split and flow device formed by the above-mentioned components can realize full-power efficient and continuous operation, and reduces the size and cost of double motors and the difficulty of structural design. However, the stepless speed change transmission system is only used for power stepless speed change output and power output of a walking system.

[0004] Therefore, existing hybrid electric transmissions for tractors mostly focus only on the walking system and the PTO (Power Take-Off) mechanism, failing to efficiently integrate the walking system, PTO output, hydraulic pump drive, and four-wheel drive power output. Adopting a multi-functional transmission requires more motors, each driving its own output transmission system. While this achieves decoupling control, it inevitably leads to a complex transmission system structure, resulting in high manufacturing costs, difficult space layout, and significant maintenance challenges. Existing four-wheel drive systems mostly use dedicated mechanical transfer cases, which not only occupy considerable space but also require significant modifications to the existing vehicle structure when combined with a continuously variable transmission (CVT), leading to structural complexity and control difficulties. Therefore, existing hybrid electric CVT systems have always faced a contradiction between the various power output functions and the complexity of the transmission system, preventing a reduction in tractor transmission costs. Summary of the Invention

[0005] The purpose of this invention is to provide an input-type power split hybrid tractor gearbox, which is highly integrated, compact in structure, and simple in transmission. While stably controlling the continuously variable transmission for walking, it can also ensure independent and stable power performance for high-power output, hydraulic pump drive, and four-wheel drive output, effectively reducing production and usage costs.

[0006] The technical solution of this invention to achieve the above objectives is as follows: An input-type power-split hybrid tractor gearbox, characterized in that it includes a gearbox housing, an input-type power-split continuously variable transmission system, and an engine direct-drive output system; The input-type power split continuously variable transmission system includes an engine, a generator, a planetary gear set, a drive motor, a walking drive group, and a four-wheel drive transmission group. The generator, planetary gear set, drive motor, walking drive group, and four-wheel drive transmission group are housed in the gearbox housing. The engine has an output shaft and an output through shaft disposed within the output shaft. The output shaft supports and passes through the gearbox housing and is connected to the planet carrier of the planetary gear set to divert mechanical power to the planetary gear set. The planetary gears are connected to the planet carrier, and the hollow shaft of the planet carrier is mounted on the PTO output shaft and can rotate. The generator provides electrical energy to the drive motor and regulates the walking speed; the sun gear of the planetary gear set is connected to the generator shaft. The drive motor shaft is connected to the ring gear of the planetary gear set to adjust the walking torque. The ring gear meshes with the sun gear through the planetary gears, and the hollow shaft of the ring gear is mounted on the PTO output shaft and can rotate. The walking driving group comprises a walking output shaft, a walking driving gear and a walking driven gear, the walking output shaft is supported on the gearbox housing, the walking driving gear is connected to the hollow shaft of the gear ring, and the walking driven gear is connected to the walking output shaft, the walking driving gear is always engaged with the walking driven gear. The four-wheel driving group comprises a four-wheel driving output shaft and a four-wheel driven gear, the four-wheel driving output shaft is supported on the gearbox housing, the four-wheel driven gear is connected to the four-wheel driving output shaft, and the four-wheel driven gear is always engaged with the walking driven gear. The engine direct driving output system comprises a PTO output shaft and a hydraulic pump driving group, the PTO output shaft and the hydraulic pump driving group are installed in the gearbox housing, the output through shaft of the engine is connected to the PTO output shaft supported on the gearbox housing. The hydraulic pump driving group comprises a hydraulic output shaft, a hydraulic driving gear and a hydraulic driven gear, the hydraulic output shaft is supported on the gearbox housing, the hydraulic driving gear is connected to the PTO output shaft, the hydraulic driven gear is connected to the hydraulic output shaft, and the hydraulic driving gear is always engaged with the hydraulic driven gear.

[0007] The input power split hybrid tractor gearbox of the application adopts the input power split stepless speed change system and the engine direct drive output system arranged in the common gearbox shell, the output shaft of the engine is connected with the planet carrier of the planetary gear set, and the driving motor is connected with the gear ring, so that the power of the stepless speed change system is input by the planet carrier and output by the gear ring, mechanical power split and motor power split are realized, the walking system stepless speed change is realized by the generator speed regulation, the engine can continuously work in the high efficiency speed range, the fuel consumption and emission are significantly reduced, and the walking power output through the gear ring can increase the output torque, further expanding the operation range of the tractor. The four drive power group of the application directly takes power from the walking output shaft, only uses the constant mesh four-wheel drive gear to distribute power to the four-wheel drive output shaft, cancels the dedicated four-wheel drive power distribution box, optimizes the overall layout space, realizes the multifunctional power output in the same shell, greatly simplifies the internal structure of the gearbox, improves the working reliability, reduces the manufacturing and using costs, and also reduces the control difficulty. The engine direct drive output system of the application adopts the PTO output shaft and the hydraulic pump drive group, so the power of the engine is directly input to the PTO output shaft to provide power for each machine tool, realizing high-power power output, and at the same time, the hydraulic drive gear on the hydraulic pump drive group is connected to the PTO output shaft, the hydraulic pump drive group provides power to each hydraulic pump through the hydraulic output shaft, and because the PTO output shaft and the hydraulic pump drive group are directly driven by the engine, the output power is independent of the tractor walking speed, ensuring the stability and sufficiency of power output under different working conditions. The tractor gearbox of the application completely cancels the shift execution element, greatly simplifies the internal structure of the gearbox, and reduces the potential failure points. The tractor gearbox of the application highly integrates the walking drive, four-wheel drive power transmission, PTO output and hydraulic pump power source in one gearbox shell, which is compact in layout, effectively utilizes the space and improves the reliability. The application realizes the innovative structure of the engine direct drive PTO output and hydraulic drive group, the generator stepless speed change walking and the integrated four-wheel drive power output in the same gearbox shell, simultaneously realizes the walking stepless speed change, four-wheel drive power distribution, independent PTO output and hydraulic system output, completely solves the fundamental contradiction between multifunctional output and transmission system complexity, improves the reliability of the overall gearbox, greatly reduces the manufacturing cost, ensures the stability and service life of each power in the common shell under various working conditions, saves the layout space of the whole machine, and provides protection for the normal work of the tractor. BRIEF DESCRIPTION OF DRAWINGS

[0008] The embodiments of the application will be further described in detail below with reference to the accompanying drawings.

[0009] Figure 1 is a structural schematic view of an input power split hybrid tractor gearbox of the application.

[0010] Figure 2 This is a schematic diagram of another input-type power split hybrid tractor gearbox of the present invention.

[0011] Wherein: 1—Engine, 1-1—Output shaft, 1-2—Output through shaft, 2—Generator, 3—Sun gear, 3-1—Hollow shaft of sun gear, 4—Planet gear, 5—Planet carrier, 5-1—Hollow shaft of planet carrier, 6—Ring gear, 6-1—Hollow shaft of ring gear, 7—Drive motor, 8—Hydraulic driven gear, 9—Hydraulic output shaft, 10—Hydraulic drive gear, 11—Travel drive gear, 12—PTO output shaft, 13—Travel driven gear, 14—Travel output shaft, 15—Four-wheel drive driven gear, 16—Four-wheel drive output shaft, 17—Gearbox housing, 17-1—Rear end cover, 17-2—Second inner wall panel, 17-3—Lower bearing cover, 17-4—First inner wall panel, 17-5—Front stiffener plate, 18—Hydraulic guide wheel, 19—Guide wheel shaft. Detailed Implementation

[0012] See Figure 1 , 2 As shown, the present invention provides an input power split hybrid tractor gearbox, comprising a gearbox housing 17, an input power split continuously variable transmission system, and an engine direct drive output system.

[0013] See Figure 1 , 2 As shown, the input-type power split continuously variable transmission system of the present invention includes an engine 1, a generator 2, a planetary gear set, a drive motor 7, a walking drive group, and a four-wheel drive transmission group. The generator 2, the planetary gear set, the drive motor 7, the walking drive group, and the four-wheel drive group are disposed in the gearbox housing 17, integrating the walking output and the four-wheel drive output in the same housing. The operating parameters of the engine 1, the generator 2, and the drive motor 7 are controlled by the electronic control unit (ECU) of existing vehicles.

[0014] See Figure 1 , 2 As shown, the engine 1 of the present invention has an output shaft 1-1 and an output through shaft 1-2 disposed within the output shaft 1-1. The output shaft 1-1 supports and passes through the gearbox housing 17 and is connected to the planet carrier 5 of the planetary gear set to divert mechanical power to the planetary gear set. The planetary gears 4 are connected to the planet carrier 5. Three to four planetary gears 4 can be connected to the planet carrier 5. The hollow shaft 5-1 of the planet carrier 5 is mounted on the PTO output shaft 12 and can rotate. Because the planetary gears 4 mesh with the ring gear 6 and the sun gear 3, the engine 1 transmits mechanical energy to the planet carrier 5. When the planet carrier 5 rotates, it drives the planetary gears 4 to rotate within the sun gear 3 and the ring gear 6, thereby realizing the diversion of mechanical power. Part of the mechanical power enters the ring gear 6 and is transmitted to the driving gear 11, while the other part drives the generator 2 through the sun gear 3.

[0015] As shown in Figure 1 The generator 2 provides power for the driving motor 7 and adjusts the walking speed, the sun gear 3 of the planetary gear set is connected with the rotating shaft of the generator 2, the sun gear 3 of the planetary gear set can drive the generator 2 to work, the power generated by the generator 2 in the power generation mode is directly transmitted to the driving motor 7 through the inverter, and the excess power can be stored in the battery, mechanical energy is converted into electric energy, and the ratio of the engine 1 rotating speed and the wheel rotating speed is continuously and steplessly changed by controlling the rotating speed and the rotating direction of the generator 2, so that continuous stepless speed change is realized, and the engine 1 is always adjusted to operate in the most economical and efficient rotating speed range.

[0016] As shown in Figure 1 , 2 The rotating shaft of the driving motor 7 is connected with the ring gear 6 of the planetary gear set for adjusting the walking torque, the ring gear 6 is engaged with the sun gear 3 through the planetary gear 4, and the ring gear hollow shaft 6-1 of the ring gear 6 is sleeved on the PTO output shaft 12 and can rotate, so that the driving motor 7 converts electric energy into mechanical power again, drives the ring gear 6 to provide the torque required by the walking power demand and adjusts the torque under different working conditions. The walking power of the present application is input by the carrier 5 and output by the ring gear 6, the speed of the generator 2 is adjusted, the torque of the driving motor 7 is adjusted, the stepless speed change of the walking system is controlled, the engine 1 can continuously work in the high-efficiency rotating speed range, and the fuel consumption and emission are significantly reduced.

[0017] As shown in Figure 1 , 2 The walking driving set of the present application comprises a walking output shaft 14, a walking driving gear 11 and a walking driven gear 13, the walking output shaft 14 is supported on the gearbox housing 17, the walking driving gear 11 is connected on the ring gear hollow shaft 6-1, so that based on power split, the power is transmitted to the walking driving gear 11 through the ring gear 6, the walking driven gear 13 is connected on the walking output shaft 14, the walking driving gear 11 is always engaged with the walking driven gear 13, the walking output shaft 14 outputs the driving power of the wheels, and the power is transmitted to the wheels through the rear axle, and the tractor is driven to walk steplessly.

[0018] As shown in Figure 1 , 2As shown, the four-wheel drive power group of the present application comprises a four-wheel drive output shaft 16 and a four-wheel drive driven gear 15, the four-wheel drive output shaft 16 is supported on the gearbox housing 17, the four-wheel drive driven gear 15 is connected to the four-wheel drive output shaft 16, and the four-wheel drive driven gear 15 is always engaged with the walking driven gear 13, the present application directly takes power from the walking output shaft 14 through the four-wheel drive driven gear 15, greatly simplifies the internal structure of the gearbox, improves the working reliability, and at the same time can reduce the manufacturing and using cost, directly redistributes the walking power to the four-wheel drive output shaft 16, facilitates control, the four-wheel drive power is provided to the front wheels through the front axle, realizes four-wheel drive of the tractor, can improve the use economy and operation efficiency, guarantees the continuous, efficient and stable work of high-power machine tools, realizes stepless variable speed walking power output and four-wheel drive power output in the same housing, and protects the stability and service life under various working conditions.

[0019] As shown in Figure 1 , 2 As shown, the engine direct drive output system of the present application comprises a PTO output shaft 12 and a hydraulic pump driving group, the PTO output shaft 12 and the hydraulic pump driving group are installed in the gearbox housing 17, the output through shaft 1-2 of the engine 1 is connected with the PTO output shaft 12 supported on the gearbox housing 17, the PTO output shaft 12 is installed on the rear end cover 17-1 through the rear bearing and penetrates out of the rear end cover, facilitating connection with various machine tools. Figure 1 As shown, the output through shaft 1-2 of the engine 1 is connected with the PTO output shaft 12, so that the power of the engine 1 is directly transmitted to the PTO output shaft 12 to directly output power, which can realize high-power power output and guarantee the stability of power output under different working conditions.

[0020] As shown in Figure 1 As shown, the hydraulic pump driving group comprises a hydraulic output shaft 9, a hydraulic driving gear 10 and a hydraulic driven gear 8, the hydraulic output shaft 9 is supported on the gearbox housing 17, the hydraulic driving gear 10 is connected to the PTO output shaft 12, which can be connected by a key, realizing direct connection of the hydraulic pump driving group and the engine 1, forming independent PTO output and hydraulic power output, the hydraulic driven gear 8 is connected to the hydraulic output shaft 9, the hydraulic driving gear 10 is always engaged with the hydraulic driven gear 8, and the power is output to the hydraulic pump through the hydraulic output shaft 9, and then the hydraulic lifting, steering and hydraulic operation required by agricultural machine tools are realized, in the same gearbox housing 17, each independent high-power power output and driving of the hydraulic pump can be formed, guaranteeing the stability and service life of each power system under various working conditions.

[0021] As shown in Figure 1 , 2As shown, the gearbox housing 17 of this invention has a front rib plate 17-5 between the generator 2 and the planetary gear set, and a first inner wall plate 17-4 and a second inner wall plate 17-2 sequentially arranged at the rear of the drive motor 7, dividing the gearbox housing 17 into a first housing, a second housing, and a third housing. The generator 2, the planetary gear set, and the drive motor 7 are sequentially and coaxially installed in the first housing. This invention places the planetary gear set between the generator 2 and the drive motor 7, which not only reduces the cost of the generator 2 and the drive motor 7 but also facilitates the installation of the planetary gear set with the generator 2 and the drive motor 7, resulting in better manufacturability. The walking drive group and the four-drive force group of this invention are installed in the second housing, achieving low walking power output and four-drive force output. The structure is simple, the operation is reliable, and the control is convenient. See Figure 1 As shown, the hydraulic pump drive unit of the present invention is installed in the third housing, and the hydraulic pump is powered by the hydraulic pump drive unit. The arrangement of each drive unit in the gearbox is optimized, which facilitates its subsequent maintenance and repair.

[0022] See Figure 1 , 2 As shown, the output shaft 1-1 of the engine 1 of the present invention is supported on the front wall by a first bearing and passes through the generator 2 and is connected to the hollow shaft 5-1 of the planetary carrier. The output shaft 1-1 of the engine 1 is installed in the bearing hole of the front housing by the first bearing and then connected to the hollow shaft 5-1 of the planetary carrier. The hollow shaft 3-1 of the sun gear 3 is connected to the rotating shaft of the generator 2. The planetary carrier 5 and the hollow shaft 5-1 of the planetary carrier are integrally formed, or the planetary carrier 5 and the hollow shaft 5-1 of the planetary carrier are fixedly connected. Similarly, the sun gear 3 and the hollow shaft 3-1 of the sun gear are integrally formed, or the sun gear 3 and the hollow shaft 5-1 of the sun gear are integrally formed. The hollow shaft 3-1 of the sun gear is fixedly connected, and the hollow shaft 3-1 of the sun gear is mounted on the front stiffener plate 17-5 through the second bearing. Two second bearings can be used and mounted on the corresponding front stiffener plate 17-5. The hollow shaft 6-1 of the gear ring 6 passes through the drive motor 7 and is mounted on the bearing holes of the first inner wall plate 17-4 and the second inner wall plate 17-2 respectively through the third bearing and the fourth bearing. During the driving and power assistance process, the gear ring 6 has a better load-bearing capacity, improves the working reliability of the planetary gear set, and realizes various operations of the high-horsepower tractor.

[0023] See Figure 1 , 2 As shown, the walking output shaft 14 of the present invention is installed in the bearing holes of the first inner wall plate 17-4 and the rear end cover 17-1 respectively through the fifth bearing and the sixth bearing, and passes through the second inner wall plate 17-2. The walking output shaft 14 passes through the rear end cover 17-1, which has good assembly performance and maintenance performance.

[0024] See Figure 1 , 2As shown, the first inner wall plate 17-4 of the application has an outer wall plate extending outward, the lower bearing cover 17-3 is sealingly installed on the outer wall plate through fasteners, the four-wheel drive output shaft 16 is correspondingly installed on the lower bearing cover 17-3 and the second inner wall plate 17-2 through the ninth bearing and the tenth bearing respectively, the four-wheel drive output shaft 16 penetrates the lower bearing cover 17-3, so that the four-wheel drive output shaft 16 extends out of the lower bearing cover 17-3 and is connected with the front axle, thereby realizing four-wheel drive.

[0025] As shown, Figure 2 As shown, the hydraulic output shaft 9 is correspondingly installed at the bearing hole of the second inner wall plate 17-2 and the bearing hole of the rear end cover 17-1 through the seventh bearing and the eighth bearing respectively, and the hydraulic output shaft 9 penetrates the rear end cover 17-1, thereby facilitating the connection with the hydraulic pump. Figure 1 As shown, the transmission of another structure of the application further has a hydraulic overrunning device 18 and an overrunning device shaft 19, the overrunning device shaft 19 is arranged between the PTO output shaft 12 and the hydraulic output shaft 9, the overrunning device shaft 19 is installed at the bearing holes of the second inner wall plate 17-2 and the rear end cover 17-1 through the ninth bearing and the tenth bearing respectively, the hydraulic overrunning device 18 connected with the overrunning device shaft 19 is always engaged with the hydraulic driving gear 10 and the hydraulic driven gear 8, so that the transmission is more compact.

[0026] When the input power split hybrid tractor transmission of the application works, as shown, Figure 1 、 2 As shown, the working process of the power split continuously variable transmission system is as follows: the flywheel of the engine 1 drives the planet carrier 5 of the planetary gear set through the output shaft 1-1 to rotate, the planet gear 4 rotates with the planet carrier 5 to drive the sun gear 3 and the ring gear 6 to rotate, thereby splitting the mechanical power of the engine 1 to the sun gear 3 and the ring gear 6, and the walking driving gear 11 is connected with the ring gear 6 to realize the output of the walking driving power after splitting; the sun gear 3 rotates to drive the rotating shaft of the generator 2 to rotate to generate electricity, thereby converting mechanical energy into electrical energy, the electrical energy is provided to the driving motor 7 after rectification through the inverter, and the speed and torque of the generator 2 are controlled to realize continuously variable transmission of walking; the rotating shaft of the driving motor 7 is connected with the ring gear 6 to realize the output of walking driving power and torque adjustment, thereby realizing the splitting of electrical power, the power is transmitted to the walking driving gear 11 through the ring gear 6, and then transmitted to the walking output shaft 14 through the walking driven gear 13, and the walking output shaft 14 outputs the rear axle as the driving power of the wheels; the four-wheel drive driven gear 15 is always engaged with the walking driven gear 13, and the four-wheel drive power is output from the four-wheel drive output shaft 16 to the front axle as the driving power of the wheels.

[0027] The working process of the engine direct drive output system is as follows: as shown, ​ 、 2As shown, the flywheel of engine 1 directly outputs PTO power through the output through shaft 1-2 and PTO output shaft 12, while the hydraulic drive gear 10 is connected to the PTO output shaft 12. The hydraulic drive gear 10 meshes with the hydraulic driven gear 8 and outputs power to the hydraulic pump through the hydraulic output shaft 9. Alternatively, the hydraulic drive gear 10 meshes with the hydraulic driven gear 8 through the hydraulic through wheel 18 to form independent PTO output and hydraulic output.

Claims

1. An input-type power-split hybrid tractor gearbox, characterized in that: This includes the gearbox housing, the input power split continuously variable transmission system, and the engine direct drive output system; The input-type power split continuously variable transmission system includes an engine, a generator, a planetary gear set, a drive motor, a walking drive group, and a four-wheel drive transmission group. The generator, planetary gear set, drive motor, walking drive group, and four-wheel drive transmission group are housed in the gearbox housing. The engine has an output shaft and an output through shaft disposed within the output shaft. The output shaft supports and passes through the gearbox housing and is connected to the planet carrier of the planetary gear set to divert mechanical power to the planetary gear set. The planetary gears are connected to the planet carrier, and the hollow shaft of the planet carrier is mounted on the PTO output shaft and can rotate. The generator provides electrical energy to the drive motor and regulates the walking speed; the sun gear of the planetary gear set is connected to the generator shaft. The drive motor shaft is connected to the ring gear of the planetary gear set to adjust the walking torque. The ring gear meshes with the sun gear through the planetary gears, and the hollow shaft of the ring gear is mounted on the PTO output shaft and can rotate. The aforementioned travel drive assembly includes a travel output shaft, a travel drive gear, and a travel driven gear. The travel output shaft is supported on the gearbox housing, the travel drive gear is connected to the hollow gear ring shaft, and the travel driven gear is connected to the travel output shaft. The travel drive gear and the travel driven gear are constantly meshed. The four-wheel drive power group includes a four-wheel drive output shaft and a four-wheel drive driven gear. The four-wheel drive output shaft is supported on the gearbox housing, and the four-wheel drive driven gear is connected to the four-wheel drive output shaft. The four-wheel drive driven gear is constantly meshed with the travel driven gear. The engine direct drive output system includes a PTO output shaft and a hydraulic pump drive assembly, which are installed inside the gearbox housing. The engine output through-shaft is connected to the PTO output shaft supported on the gearbox housing. The hydraulic pump drive assembly includes a hydraulic output shaft, a hydraulic drive gear, and a hydraulic driven gear. The hydraulic output shaft is supported on the gearbox housing, the hydraulic drive gear is connected to the PTO output shaft, and the hydraulic driven gear is connected to the hydraulic output shaft. The hydraulic drive gear and the hydraulic driven gear are constantly meshed.

2. The input-type power-split hybrid tractor gearbox according to claim 1, characterized in that: The gearbox housing has a front stiffener between the generator and the planetary gear set, and a first inner wall plate and a second inner wall plate arranged sequentially at the rear of the drive motor, dividing the gearbox housing into a first housing, a second housing, and a third housing. The generator, the planetary gear set, and the drive motor are installed sequentially and coaxially in the first housing, the walking drive group and the four-drive force group are installed in the second housing, and the hydraulic pump drive group is installed in the third housing.

3. An input-type power-split hybrid tractor gearbox according to claim 1 or 2, characterized in that: The output shaft of the engine is supported on the front wall by the first bearing and passes through the generator and is connected to the hollow shaft of the planetary carrier. The hollow shaft of the sun gear is connected to the rotating shaft of the generator, and the hollow shaft of the sun gear is mounted on the front stiffener plate by the second bearing. The hollow shaft of the gear ring passes through the drive motor and is installed in the bearing holes of the first inner wall plate and the second inner wall plate respectively by the third bearing and the fourth bearing.

4. An input-type power-split hybrid tractor gearbox according to claim 1 or 2, characterized in that: The walking output shaft is installed in the bearing holes of the first inner wall plate and the rear end cover respectively through the fifth bearing and the sixth bearing, and passes through the second inner wall plate. The walking output shaft extends out of the rear end cover.

5. The input-type power-split hybrid tractor gearbox according to claim 2, characterized in that: The first inner wall panel has an outer wall panel extending outwards. The lower bearing cover is sealed and installed on the outer wall panel by fasteners. The four-wheel drive output shaft is installed on the lower bearing cover and the second inner wall panel respectively by the ninth bearing and the tenth bearing, and the four-wheel drive output shaft extends out of the lower bearing cover.

6. An input-type power-split hybrid tractor gearbox according to claim 1 or 2, characterized in that: The hydraulic output shaft is installed in the bearing holes of the second inner wall plate and the rear hydraulic drive gear respectively via the seventh and eighth bearings, and the hydraulic output shaft passes through the rear end cover; the hydraulic pump drive group also has a hydraulic guide wheel and a guide wheel shaft, the guide wheel shaft is located between the PTO output shaft and the hydraulic output shaft, the guide wheel shaft is installed in the bearing holes of the second inner wall plate and the rear end cover respectively via the ninth and tenth bearings, and the guide wheel gear connected to the guide wheel shaft is in constant mesh with the hydraulic drive gear and the hydraulic driven gear.

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