Tractor gearbox transmission structure and new energy tractor with same

Abstract

The utility model relates to a tractor gearbox transmission structure and a new energy tractor. The tractor gearbox transmission structure comprises a walking motor, a power output motor, a rear axle, a transmission first shaft and a transmission second shaft, the walking motor is connected with the transmission first shaft, the transmission first shaft is connected with the transmission second shaft through a planetary gear transmission mechanism, the transmission second shaft is connected with the rear axle, and the power output motor is connected with a third transmission shaft. The third transmission shaft is provided with a hybrid clutch and is connected with a first shaft of the transmission through the hybrid clutch and the power transmission assembly, the third transmission shaft is further connected with a PTO transmission assembly through a PTO clutch, and the PTO transmission assembly is connected with a PTO transmission shaft. The utility model has the advantage that the purpose of flexible use of the walking motor and the power output motor during low-load operation and high-load operation can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of tractor power transmission, and particularly relates to a transmission structure of a tractor gearbox and a new energy tractor with the same. Background Art

[0002] As an important mechanical equipment in agricultural production, traditional tractors use engines as power sources. However, engines mainly use diesel or gasoline as energy sources, and generally emit exhaust gases, causing damage to the environment.

[0003] At present, new energy tractors generally adopt hybrid power, pure electricity, hydrogen energy, etc., which can minimize environmental pollution. Engines have the characteristics of a small output speed change range and difficulty in starting with load, and a gearbox is required for speed reduction and torque increase, speed change and torque change, etc. Due to the large difference between the low-speed torque and power of the engine and that at high speed, tractors need to design many gears, generally 8 to more than 40 gears. This makes the entire transmission system of the tractor relatively complex and the operation relatively cumbersome.

[0004] The motor has the advantages of large low-speed torque and wide speed regulation range. Therefore, it is necessary to develop a new transmission structure for a tractor gearbox, so that it has become one of the development trends to use the motor instead of the engine as the power source, and utilize the characteristic that the difference between the low-speed power and the high-speed power of the motor is small to greatly reduce the number of gears. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a transmission structure of a tractor gearbox and a new energy tractor with the same, which effectively overcomes the defects of the prior art.

[0006] The technical solution of the utility model to solve the above technical problem is as follows:

[0007] A transmission structure of a tractor gearbox includes a traveling motor, a power output motor, a rear axle, a first transmission shaft and a second transmission shaft. The traveling motor is connected to the first transmission shaft. The first transmission shaft is connected to the second transmission shaft through a planetary gear transmission mechanism. The second transmission shaft is connected to the rear axle. The power output motor is connected to a third transmission shaft. A hybrid clutch is installed on the third transmission shaft, and the third transmission shaft is connected to the first transmission shaft through the hybrid clutch and a power transmission component. The third transmission shaft is also connected to a PTO transmission component through a PTO clutch, and the PTO transmission component is connected to a PTO transmission shaft.

[0008] Based on the above technical solution, the utility model can also be improved as follows.

[0009] Further, the above planetary gear transmission mechanism includes a front row sun gear, a rear row sun gear, a planetary gear carrier, a front row internal gear ring and a rear row internal gear ring. The front row sun gear is rotatably sleeved on the first shaft of the transmission. The rear row sun gear is fixedly installed on the first shaft of the transmission. The planetary gear carrier is sleeved outside the first shaft of the transmission. One end of the planetary gear carrier is assembled with front row planetary gears that mesh with the front row sun gear, and the other end of the planetary gear carrier is assembled with rear row planetary gears that mesh with the rear row sun gear. The front row internal gear ring is coaxially fixed on the first shaft of the transmission, and its internal teeth mesh with the front row planetary gears. The rear row internal gear ring is coaxially fixed on the second shaft of the transmission, and its internal teeth mesh with the rear row planetary gears. A direct gear clutch is also installed on the first shaft of the transmission, and the direct gear clutch is connected to the front row sun gear.

[0010] Further, a low-speed brake band for braking the direct gear clutch is provided at the direct gear clutch, and a reverse brake band for braking the planetary gear carrier is provided at the planetary gear carrier.

[0011] Further, the above power transmission assembly includes a hybrid first gear and a hybrid second gear that mesh with each other. The hybrid first gear is rotatably installed on the third transmission shaft and is connected to the hybrid clutch, and the hybrid second gear is fixedly installed on the first shaft of the transmission.

[0012] Further, a lubricating oil power transmission system is also included. The power transmission assembly further includes a hybrid third gear. The hybrid third gear is coaxially connected to the hybrid first gear, and the hybrid third gear is transmission-connected to the lubricating oil power transmission system through a gear transmission assembly.

[0013] Further, the above lubricating oil power transmission system includes a lubricating hydraulic pump, a system hydraulic pump and a working hydraulic pump. The gear transmission assembly includes a hydraulic output gear. The main shafts of the lubricating hydraulic pump, the system hydraulic pump and the working hydraulic pump are all coaxially connected, and the hydraulic output gear is installed on the connected main shaft. The hydraulic output gear meshes with the hybrid third gear.

[0014] Further, the above-mentioned PTO transmission assembly includes a PTO first shaft, a PTO low-gear driving gear, a PTO low-gear driven gear, a PTO high-gear driving gear, a PTO high-gear driven gear and a sliding sleeve. The above-mentioned PTO first shaft is connected to the above-mentioned PTO clutch. The above-mentioned PTO low-gear driving gear is coaxially and rotatably mounted on the above-mentioned PTO first shaft. The above-mentioned PTO low-gear driven gear is fixedly mounted on the above-mentioned PTO transmission shaft and meshes with the above-mentioned PTO low-gear driving gear. The above-mentioned PTO high-gear driving gear is coaxially and rotatably mounted on the above-mentioned PTO first shaft. The above-mentioned PTO high-gear driven gear is fixedly mounted on the above-mentioned PTO transmission shaft and meshes with the above-mentioned PTO high-gear driving gear. The above-mentioned sliding sleeve is coaxially and slidably mounted on the above-mentioned PTO first shaft and can axially slide to selectively engage with the above-mentioned PTO low-gear driving gear and the PTO high-gear driving gear.

[0015] Further, the second shaft of the above-mentioned transmission is connected to a transfer case. The output end of the transfer case is connected to a first transmission shaft. The front axle of the tractor is connected to a second transmission shaft. The above-mentioned first transmission shaft and the second transmission shaft are connected by a four-wheel drive clutch.

[0016] Further, the above-mentioned transfer case includes a case body and a transfer case driving gear and a transfer case driven gear that are rotatably mounted in the above-mentioned case body. The above-mentioned transfer case driving gear and the transfer case driven gear mesh with each other. The above-mentioned transfer case driving gear is coaxially mounted on the first shaft of the above-mentioned transmission. The above-mentioned transfer case driven gear is coaxially mounted on the shaft end of the above-mentioned first transmission shaft.

[0017] Further, the above-mentioned PTO clutch is a wet clutch.

[0018] The beneficial effects of the present utility model are as follows: The structure is reasonably designed, and it can achieve the purpose of flexible use that the traveling motor and the power output motor can operate independently according to the working conditions during low-load operations and can perform power combination through the hybrid clutch during high-load operations.

[0019] There is also provided a new energy tractor, including a tractor transmission structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of an embodiment of the tractor transmission structure of the present utility model;

[0021] Figure 2 is a schematic structural diagram of another embodiment of the tractor transmission structure of the present utility model

[0022] Figure 3 is a schematic structural diagram of yet another embodiment of the tractor transmission structure of the present utility model.

[0023] In the drawings, the list of components represented by each reference numeral is as follows:

[0024] 1. Travel motor; 2. Power output motor; 3. Rear axle; 4. Front axle; 5. First shaft of transmission; 6. Second shaft of transmission; 7. Four-wheel drive clutch; 8. Hybrid clutch; 9. PTO clutch; 10. PTO drive shaft; 30. Direct gear clutch; 40. Low-speed brake band; 50. Reverse gear brake band; 201. Front row sun gear; 202. Rear row sun gear; 203. Planet gear carrier; 204. Front row internal gear ring; 205. Rear row internal gear ring; 601. First hybrid gear; 602. Second hybrid gear; 603. Third hybrid gear; 701. First PTO shaft; 702. PTO low gear driving gear; 703. PTO low gear driven gear; 704. PTO high gear driving gear; 705. PTO high gear driven gear; 706. Engagement sleeve; 801. Lubricating hydraulic pump; 802. System hydraulic pump; 803. Working hydraulic pump; 804. Hydraulic output gear; 901. Transfer case driving gear; 902. Transfer case driven gear. Detailed implementation mode

[0025] The principle and features of the present utility model will be described below in conjunction with the accompanying drawings. The examples given are only for explaining the present utility model and are not intended to limit the scope of the present utility model.

[0026] Embodiment 1

[0027] As Figure 1 shown, the transmission structure of the tractor gearbox in this embodiment includes a travel motor 1, a power output motor 2, a rear axle 3, a first shaft 5 of the transmission, and a second shaft 6 of the transmission. The travel motor 1 is connected to the first shaft 5 of the transmission. The first shaft 5 of the transmission is connected to the second shaft 6 of the transmission through a planetary gear transmission mechanism. The second shaft 6 of the transmission is connected to the rear axle 3. The power output motor 2 is connected to a third drive shaft. A hybrid clutch 8 is installed on the third drive shaft and is connected to the first shaft 5 of the transmission through the hybrid clutch 8 and a power transmission component. The third drive shaft is also connected to a PTO transmission component through a PTO clutch 9, and the PTO transmission component is connected to a PTO drive shaft 10.

[0028] The transmission structure of the tractor gearbox in this embodiment has two motors for travel and power output. When performing normal operations, the travel motor 1 is used for driving. The other one (that is, the power output motor 2) is used for PTO (POWER TAKE - OFF) power. When in high - load situations, it can achieve the combined high - power output of the two motors. When performing pure traction operations, only the travel motor 1 operates, and the power output motor 2 and the transmission system do not act. When performing pure PTO operations, only the power output motor 2 acts. Thus, the energy consumption can be saved. The transmission structure adopts a planetary gear transmission mechanism, which has the characteristics of smooth transmission and large transmission ratio.

[0029] In this embodiment, the planetary gear transmission mechanism includes a front row sun gear 201, a rear row sun gear 202, a planetary gear carrier 203, a front row internal gear ring 204 and a rear row internal gear ring 205. The front row sun gear 201 is rotatably sleeved on the first shaft 5 of the transmission. The rear row sun gear 202 is fixedly installed on the first shaft 5 of the transmission. The planetary gear carrier 203 is sleeved outside the first shaft 5 of the transmission. One end of the planetary gear carrier 203 is assembled with a front row planetary gear a meshing with the front row sun gear 201, and the other end is assembled with a rear row planetary gear b meshing with the rear row sun gear 202. The front row internal gear ring 204 is coaxially fixed on the first shaft 5 of the transmission, and its internal teeth mesh with the front row planetary gear. The rear row internal gear ring 205 is coaxially fixed on the second shaft 6 of the transmission, and its internal teeth mesh with the rear row planetary gear. A direct gear clutch 30 is also installed on the first shaft 5 of the transmission, and the direct gear clutch 30 is connected to the front row sun gear 201.

[0030] More specifically, a low speed gear brake band 40 for braking the direct gear clutch 30 is provided at the direct gear clutch 30, and a reverse gear brake band 50 for braking the planetary gear carrier 203 is provided at the planetary gear carrier 203.

[0031] Specifically, during the operation process, the power transmission routes of each gear are as follows:

[0032] ① Neutral

[0033] The direct gear clutch 30 is in a disengaged state, and both the low speed gear brake band 40 and the reverse gear brake band 50 are in a non-braking state. At this time, all the basic components in the planetary gear transmission mechanism can rotate freely, so the planetary gear transmission mechanism cannot transmit power and is in a neutral state.

[0034] ② Low speed gear

[0035] The direct gear clutch 30 is in a disengaged state, the low speed gear brake band 40 is braked, and the reverse gear brake band 50 is released, so that the front row sun gear 201 is fixed. The power of the traveling motor 1 is divided into two parts for transmission: one part is transmitted from the front row internal gear ring 204 through the planetary gear carrier 203 to the rear row planetary gear b, and the other part is transmitted through the rear row sun gear 202 to the rear row planetary gear b. After the two parts of power are combined, they are transmitted to the second shaft 6 of the transmission through the rear row internal gear ring 205, and the second shaft 6 of the transmission transmits the power to the rear axle 3.

[0036] It should be noted that: under the condition of having a four-wheel drive clutch 7 and a transfer case, the second shaft 6 of the transmission can transmit a part of the power to the rear axle 3, and the other part is transmitted to the front axle 4 through the transfer case, the first drive shaft, the four-wheel drive clutch 7 and the second drive shaft.

[0037] ③ High speed gear

[0038] The direct gear clutch 30 is in the engaged state, the low-speed brake band 40 and the reverse brake band 50 are both in the relaxed state. The front row sun gear 201, the front row internal gear ring 204 and the first transmission shaft 5 are connected as a whole. Also, since the planetary gear carrier 203 is shared by the planetary gears of the front and rear rows, and the second transmission shaft 6 of the transmission is connected as a whole with the rear row internal gear ring 205, the first transmission shaft 5 and the second transmission shaft 6 of the transmission are integrated, so its transmission ratio is 1. The second transmission shaft 6 transmits power to the rear axle 3.

[0039] It should be noted that: under the condition of having the four-wheel drive clutch 7 and the transfer case, the second transmission shaft 6 can transmit a part of the power to the rear axle 3, and transmit another part of the power to the front axle 4 through the transfer case, the first transmission shaft, the four-wheel drive clutch 7 and the second transmission shaft.

[0040] ④ Reverse gear

[0041] The reverse brake band 50 is in the braking state, the planetary gear carrier 203 is fixed, and the low-speed brake band 40 is relaxed, and the direct gear clutch 30 is disengaged. It can be seen that the front row sun gear 201 can rotate freely. After the power is transmitted from the first transmission shaft 5 to the rear row sun gear 202, it is output via the rear row internal gear ring 205, and the rotation direction of the rear row internal gear ring 205 is opposite to that of the rear row sun gear 202, that is, the reverse gear operation is realized. The second transmission shaft 6 transmits power to the rear axle 3.

[0042] It should be noted that: under the condition of having the four-wheel drive clutch 7 and the transfer case, the second transmission shaft 6 can transmit a part of the power to the rear axle 3, and transmit another part of the power to the front axle 4 through the transfer case, the first transmission shaft, the four-wheel drive clutch 7 and the second transmission shaft.

[0043] When PTO (power take-off) operation is required, the power output motor 2 operates, the PTO clutch 9 is engaged, and the power is transmitted through the PTO transmission component to the PTO transmission shaft 10.

[0044] In the vehicle system, because there is a hybrid clutch 8 designed, when the hybrid clutch 8 is engaged, the power of the traveling motor 1 and the power output motor 2 realizes power confluence through the power transmission component, so as to cope with the super-large load condition.

[0045] As a preferred implementation manner, the above-mentioned power transmission component includes a hybrid first gear 601 and a hybrid second gear 602 that mesh with each other. The above-mentioned hybrid first gear 601 is rotatably installed on the above-mentioned third transmission shaft and is connected to the above-mentioned hybrid clutch 8, and the above-mentioned hybrid second gear 602 is fixedly installed on the above-mentioned first transmission shaft 5 of the transmission.

[0046] In the above embodiments, when the hybrid clutch 8 is engaged, the power of the traveling motor 1 and the power output motor 2 is power combined through the hybrid first gear 601 and the hybrid second gear 602, and the design is relatively simple and ingenious.

[0047] As a preferred embodiment, as Figure 3 shown, it further includes a lubricating oil power transmission system. The above power transmission assembly further includes a hybrid third gear 603. The above hybrid third gear 603 is coaxially connected to the above hybrid first gear 601, and the above hybrid third gear 603 is in transmission connection with the above lubricating oil power transmission system through a gear transmission assembly.

[0048] In the above embodiments, through the design of the power transmission assembly, when the traveling motor 1 operates, the power can be transmitted to the lubricating oil power transmission system through the hybrid first gear 601, the hybrid second gear 602, and the hybrid third gear 603, so that the lubricating oil power transmission system is driven to operate, realizing the output of the lubricating hydraulic oil of the whole machine. Such a design combines the lubrication system with the transmission structure and has good linkage.

[0049] As a preferred embodiment, the above lubricating oil power transmission system includes a lubricating hydraulic pump 801, a system hydraulic pump 802, and a working hydraulic pump 803. The above gear transmission assembly includes a hydraulic output gear 804. The main shafts of the above lubricating hydraulic pump 801, system hydraulic pump 802, and working hydraulic pump 803 are all coaxially connected, and the above hydraulic output gear 804 is installed on the connected main shaft. The above hydraulic output gear 804 meshes with the above hybrid third gear 603.

[0050] In the above embodiments, when the traveling motor 1 acts, the power can be transmitted to the hybrid third gear 603 through the hybrid first gear 601 and the hybrid second gear 602, and then transmitted to the hydraulic output gear 804. The hydraulic output gear 804 drives the lubricating hydraulic pump 801, the system hydraulic pump 802, and the working hydraulic pump 803 to act respectively, and can provide the lubricating hydraulic oil of the whole machine, the system adjustment hydraulic oil, and the working device control hydraulic oil (such as the three-point hitch system) and the hydraulic output of the multi-way valve.

[0051] As a preferred embodiment, the above-mentioned PTO transmission assembly includes a PTO first shaft 701, a PTO low-gear driving gear 702, a PTO low-gear driven gear 703, a PTO high-gear driving gear 704, a PTO high-gear driven gear 705, and a sliding sleeve 706. The above-mentioned PTO first shaft 701 is connected to the above-mentioned PTO clutch 9. The above-mentioned PTO low-gear driving gear 702 is coaxially and rotatably mounted on the above-mentioned PTO first shaft 701. The above-mentioned PTO low-gear driven gear 703 is fixedly mounted on the above-mentioned PTO transmission shaft 10 and meshes with the above-mentioned PTO low-gear driving gear 702. The above-mentioned PTO high-gear driving gear 704 is coaxially and rotatably mounted on the above-mentioned PTO first shaft 701. The above-mentioned PTO high-gear driven gear 705 is fixedly mounted on the above-mentioned PTO transmission shaft 10 and meshes with the above-mentioned PTO high-gear driving gear 704. The above-mentioned sliding sleeve 706 is coaxially and slidably mounted on the above-mentioned PTO first shaft 701 and can axially slide to selectively engage with the above-mentioned PTO low-gear driving gear 702 and the PTO high-gear driving gear 704.

[0052] In the above-mentioned embodiment, when a PTO (power take-off) operation is required, the power output motor 2 operates, the PTO clutch 9 engages, and power is transmitted to the PTO transmission shaft 10 through the transmission action of the PTO low-gear driving gear 702, the PTO low-gear driven gear 703, the PTO high-gear driving gear 704, and the PTO high-gear driven gear 705. The rotational speed of the two gears (PTO transmission shaft 10) at high and low levels can be adjusted by the axial sliding of the sliding sleeve 706. The design is relatively reasonable and the gear shift is smooth.

[0053] As a preferred embodiment, as Figure 2 shown, the second shaft 6 of the above-mentioned transmission is connected to the transfer case, the output end of the transfer case is connected to the first transmission shaft, the front axle 4 of the tractor is connected to the second transmission shaft, and the first transmission shaft and the second transmission shaft are connected by a four-wheel drive clutch 7.

[0054] In the above-mentioned embodiment, the design of the four-wheel drive clutch 7 and the transfer case can achieve the purpose of delivering the power of the transmission to the rear axle 3 and the front axle 4 of the vehicle. The vehicle can disconnect and engage the power transmitted to the front axle 4 through the four-wheel drive clutch 7, thereby realizing two-wheel drive and four-wheel drive of the vehicle. Specifically, when the four-wheel drive clutch 7 engages, the power can be switched to four-wheel drive. When the four-wheel drive clutch 7 disengages, the rear-wheel drive mode is realized.

[0055] In this embodiment, the above-mentioned transfer case includes a case body and a transfer case driving gear 901 and a transfer case driven gear 902 that are rotatably mounted in the case body. The above-mentioned transfer case driving gear 901 and the transfer case driven gear 902 mesh with each other. The above-mentioned transfer case driving gear 901 is coaxially mounted on the first shaft 5 of the transmission, and the above-mentioned transfer case driven gear 902 is coaxially mounted at the shaft end of the first transmission shaft.

[0056] In this embodiment, the above-mentioned PTO clutch 9 adopts a wet clutch of a suitable model.

[0057] Compared with the traditional tractor transmission system or the new energy transmission system, the transmission structure of the tractor gearbox in this embodiment has the characteristics of low emission pollution and low unit operation time cost. Through the special design of the gearbox structure, it is realized that when the walking motor and the power output motor are operating at low load, they can operate independently according to the working conditions. When operating at high load, power combination can be achieved through the hybrid clutch.

[0058] Embodiment 2

[0059] The new energy tractor of this embodiment includes the tractor gearbox transmission structure in Embodiment 1.

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0061] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0062] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0064] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0065] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A transmission structure of a tractor gearbox, characterized in that: The invention comprises a travel motor (1), a power output motor (2), a rear axle (3), a first transmission shaft (5) and a second transmission shaft (6), wherein the travel motor (1) is connected to the first transmission shaft (5), the first transmission shaft (5) is connected to the second transmission shaft (6) via a planetary gear transmission mechanism, the second transmission shaft (6) is connected to the rear axle (3), the power output motor (2) is connected to a third transmission shaft, a hybrid clutch (8) is mounted on the third transmission shaft, and the third transmission shaft is connected to the first transmission shaft (5) via the hybrid clutch (8) and a power transmission assembly, the third transmission shaft is also connected to a PTO transmission assembly via a PTO clutch (9), and the PTO transmission assembly is connected to a PTO transmission shaft (10).

2. The transmission structure of a tractor gearbox according to claim 1, characterized in that: The planetary gear transmission mechanism comprises a front row sun gear (201), a rear row sun gear (202), a planetary gear carrier (203), a front row inner gear ring (204) and a rear row inner gear ring (205); the front row sun gear (201) is rotatably mounted on the first shaft (5) of the transmission; the rear row sun gear (202) is fixedly mounted on the first shaft (5) of the transmission; the planetary gear carrier (203) is sleeved outside the first shaft (5) of the transmission and one end of the planetary gear carrier is equipped with a front row sun gear (201) meshing with the front row sun gear (201). The planetary gear has a rear-row planetary gear meshed with the rear-row sun gear (202) at the other end thereof; the front-row inner gear ring (204) is coaxially fixed on the first shaft (5) of the transmission, and its internal teeth are meshed with the front-row planetary gear; the rear-row inner gear ring (205) is coaxially fixed on the second shaft (6) of the transmission, and its internal teeth are meshed with the rear-row planetary gear; the first shaft (5) of the transmission is also equipped with a direct gear clutch (30), and the direct gear clutch (30) is connected to the front-row sun gear (201).

3. A transmission structure of a tractor gearbox according to claim 2, characterized in that: The direct gear clutch (30) is provided with a low gear brake band (40) for braking the direct gear clutch, and the planetary gear carrier (203) is provided with a reverse gear brake band (50) for braking the direct gear clutch.

4. A transmission structure of a tractor gearbox according to claim 1, characterized in that: The power transmission assembly comprises a hybrid first gear (601) and a hybrid second gear (602) meshing with each other, wherein the hybrid first gear (601) is rotatably mounted on the third transmission shaft and connected to the hybrid clutch (8), and the hybrid second gear (602) is fixedly mounted on the transmission first shaft (5).

5. A transmission structure of a tractor gearbox according to claim 4, characterized in that: It also includes a lubricating oil power transmission system, and the power transmission component also includes a hybrid third gear (603), the hybrid third gear (603) is coaxially connected to the hybrid first gear (601), and the hybrid third gear (603) is connected to the lubricating oil power transmission system through the gear transmission component.

6. A transmission structure of a tractor gearbox according to claim 5, characterized in that: The lubricating oil power transmission system includes a lubricating hydraulic pump (801), a system hydraulic pump (802), and a working hydraulic pump (803). The gear transmission assembly includes a hydraulic output gear (804). The main shafts of the lubricating hydraulic pump (801), the system hydraulic pump (802), and the working hydraulic pump (803) are coaxially connected, and the hydraulic output gear (804) is mounted on the connected main shaft. The hydraulic output gear (804) meshes with the hybrid third gear (603).

7. A transmission structure of a tractor gearbox according to claim 1, characterized in that: The PTO transmission assembly includes a PTO first shaft (701), a PTO low - gear driving gear (702), a PTO low - gear driven gear (703), a PTO high - gear driving gear (704), a PTO high - gear driven gear (705), and a sliding sleeve (706). The PTO first shaft (701) is connected to the PTO clutch (9). The PTO low - gear driving gear (702) is coaxially and rotatably mounted on the PTO first shaft (701). The PTO low - gear driven gear (703) is fixedly mounted on the PTO transmission shaft (10) and meshes with the PTO low - gear driving gear (702). The PTO high - gear driving gear (704) is coaxially and rotatably mounted on the PTO first shaft (701). The PTO high - gear driven gear (705) is fixedly mounted on the PTO transmission shaft (10) and meshes with the PTO high - gear driving gear (704). The sliding sleeve (706) is coaxially and slidably mounted on the PTO first shaft (701) and can axially slide to selectively engage with the PTO low - gear driving gear (702) and the PTO high - gear driving gear (704).

8. A transmission structure of a tractor gearbox according to any one of claims 1 to 7, characterized in that: The second shaft (6) of the transmission is connected to the transfer case. The output end of the transfer case is connected to the first transmission shaft. The front axle (4) of the tractor is connected to the second transmission shaft. The first transmission shaft and the second transmission shaft are connected by a four - wheel drive clutch (7).

9. The transmission structure of a tractor gearbox according to claim 8, characterized in that: The transfer case includes a case body and a transfer case driving gear (901) and a transfer case driven gear (902) rotatably mounted in the case body. The transfer case driving gear (901) and the transfer case driven gear (902) mesh with each other. The transfer case driving gear (901) is coaxially mounted on the first shaft (5) of the transmission. The transfer case driven gear (902) is coaxially mounted on the shaft end of the first transmission shaft.

10. A new energy tractor, characterized in that: It includes the tractor transmission gear structure according to any one of claims 1 to 9.

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