Power take-off transmission structure for tractor

Abstract

The utility model provides a tractor power output transmission structure, including coaxial arrangement's input gear shaft, gear shift transmission shaft and extension transmission shaft, gear shift transmission shaft's first end is rotatively connected with the second end of input gear shaft, the second end of gear shift transmission shaft is transmission coupling with the first end of extension transmission shaft, and the second end of extension transmission shaft is transmission coupling with power output shaft, gear shift transmission shaft still is equipped with gear shift transmission wheel system on, and the side of gear shift transmission shaft still is equipped with multi-connection gear shaft, gear shift transmission wheel system and the second end of input gear shaft are transmission coupling with multi-connection gear shaft respectively. Adopt the utility model, through input gear shaft, gear shift transmission shaft and extension transmission shaft coaxial arrangement, and multi-connection gear bearing accepts the power of input gear shaft and then transmits to the gear shift transmission wheel system on gear shift transmission shaft, and gear shift operation is convenient, and compact structure, and the power output power gear position is many, can adapt more operation machine and working condition.

Description

Technical Field

[0001] This utility model relates to the technical field of tractor power output devices, and specifically to a tractor power output transmission structure. Background Technology

[0002] Currently, with the increase in the types of cash crops, agricultural production places higher demands on the power output and operational flexibility of tractors. Tractor operation is a common working mode, and multiple power output speeds can be matched with different agricultural implements, suitable for various operating modes. To adapt to different operating loads and speeds, the demand for multi-speed power output is becoming increasingly strong. However, a tractor typically only has high or low power output speeds, which cannot meet the needs of various working conditions. Utility Model Content

[0003] To solve at least one of the above technical problems, this utility model provides a tractor power output transmission structure.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: This utility model provides a tractor power output transmission structure, including an input gear shaft, a shift gear shaft, and an extension drive shaft arranged coaxially. The first end of the shift gear shaft is rotatably connected to the second end of the input gear shaft, and the second end of the shift gear shaft is drive-connected to the first end of the extension drive shaft. The second end of the extension drive shaft is drive-connected to a power output shaft. A shift gear train is also sleeved on the shift gear shaft, and a multi-gear shaft is also provided on one side of the shift gear shaft. The shift gear train and the second end of the input gear shaft are respectively drive-connected to the multi-gear shaft.

[0005] The beneficial effects of this utility model are: This invention utilizes a coaxial arrangement of the input gear shaft, shift gear shaft, and extension transmission shaft, resulting in a long power transmission distance. Simultaneously, a multi-gear shaft is positioned on one side of the shift gear shaft. The multi-gear bearing receives power from the input gear shaft and transmits it to the shift gear train on the shift gear shaft. Therefore, by simply operating the engagement / disengagement relationship between the shift gear shaft and the shift gear train, the rotational speed transmitted from the shift gear shaft to the power output shaft can be changed, making shifting convenient. Furthermore, multiple gears are achieved on two shafts, resulting in a compact structure with multiple power output gears, adaptable to a wider range of work tools and operating conditions.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the gear shifting system includes a high-gear engagement sleeve, a low-reverse gear engagement sleeve, a middle-gear driven gear, and a low-gear driven gear. The high-gear engagement sleeve and the low-reverse gear engagement sleeve are both connected to the gear shifting shaft for transmission. The middle-gear driven gear and the low-gear driven gear are both rotatably mounted on the gear shifting shaft and mesh with the multi-gear shaft for transmission. The high-gear engagement sleeve is located between the input gear shaft and the middle-gear driven gear and can slide axially to mesh with the input gear shaft or with the middle-gear driven gear. The low-reverse gear engagement sleeve is located on one side of the low-gear driven gear and can slide axially to mesh with or disengage from the low-gear driven gear.

[0008] The system achieves at least three gears through the use of mid-to-high gear engagement sleeves and low-to-reverse gear engagement sleeves, making operation convenient. At the same time, by coaxially connecting the gear shift shaft with the input gear shaft, the mid-to-high gear engagement sleeves can directly engage with the second end of the input gear shaft for gear shifting. This results in fewer gears, better compactness, and when outputting in high gear, it eliminates the process of power transmission from the input gear shaft through a multi-gear shaft, thus improving the overall transmission efficiency of high gear output.

[0009] Furthermore, a reverse gear driven wheel is rotatably sleeved on the shift shaft, and the low reverse gear engagement sleeve is located between the low gear driven wheel and the reverse gear driven wheel; it also includes a reverse idler wheel, and the reverse gear driven wheel and the multi-gear shaft respectively mesh with the reverse idler wheel.

[0010] It enables reverse gear output, thus the gear structure is configured with 3 forward gears + 1 reverse gear for a total of 4 gears, which can be adapted to more operating tools and working conditions.

[0011] Furthermore, it also includes a reverse gear shaft, which is fixed to an external fixed structure; the reverse idler wheel is rotatably sleeved on the reverse gear shaft.

[0012] It improves the stability of the reverse idler gear.

[0013] Furthermore, the second end of the input gear shaft is provided with a coupling groove, and the first end of the shift gear shaft extends into the coupling groove and is connected to the side wall of the coupling groove through a bearing.

[0014] By having the first end of the shift shaft extend into the coupling groove, the surface of the shift shaft connects better with the input gear shaft, and the mid-to-high gear engagement sleeve engages more easily with the input gear shaft, avoiding jamming during shifting and making shifting smoother. At the same time, the shift shaft is installed using the second end of the input gear shaft, and both can share a common external fixing structure for installation, saving the support structure required when installing one end of the shift shaft and improving compactness.

[0015] Furthermore, it also includes a travel drive shaft and a central drive assembly, with one end of the travel drive shaft being connected to the central drive assembly; the multi-gear shaft is a hollow shaft, and the multi-gear shaft is rotatably sleeved on the travel drive shaft.

[0016] By utilizing the space on the drive shaft to install a multi-gear shaft, the structural compactness is improved. The arrangement of the multi-gear shaft does not require additional space and can be implemented on the existing tractor drive space, thus reducing implementation costs.

[0017] Furthermore, a wet clutch is also installed at the first end of the input gear shaft, and the input shaft of the wet clutch is used to connect to the power source.

[0018] By using a wet clutch to receive power and transmit it to the input gear shaft, power transmission and interruption operations are simple, which can improve work efficiency and bring convenience to users.

[0019] Furthermore, a spline sleeve is provided between the shift shaft and the extension drive shaft, and the second end of the shift shaft and the first end of the extension drive shaft both extend into the spline sleeve and engage with it.

[0020] After the gear shift shaft is installed, the spline sleeve is placed on its second end, and then the first end of the extension drive shaft is inserted into the spline sleeve. The second end is connected to the external frame through a bearing. The installation is convenient and the transmission efficiency is high.

[0021] Furthermore, an output drive wheel is fixed to the second end of the extended transmission shaft, and an output driven wheel is fixed to the power output shaft, with the output drive wheel meshing with the output driven wheel.

[0022] It facilitates the transmission between the extended drive shaft and the power output shaft, and the power output shaft can be disassembled and installed separately, making disassembly and assembly convenient and maintenance costs low.

[0023] Furthermore, the output drive wheel and the extended drive shaft are integrally formed; bearing mounting positions are provided on both sides of the output drive wheel and both sides of the output driven wheel.

[0024] It is easy to process, and the output drive wheel has high strength and long service life. Through the bearing mounting position, both sides of the output drive wheel and both sides of the output driven wheel can be mounted on the external frame by bearings, which improves the stability of the extended drive shaft and power output shaft. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model.

[0026] In the accompanying drawings, the technical features represented by each reference numeral are as follows: 1-Input gear shaft; 2-Shift gear shaft; 3-Extension drive shaft; 4-Multi-gear shaft; 5-Power output shaft; 6-Medium / high gear engagement sleeve; 7-Low / reverse gear engagement sleeve; 8-Medium gear driven gear; 9-Low gear driven gear; 10-Reverse gear driven gear; 11-Reverse gear shaft; 12-Reverse gear idler gear; 13-Travel drive shaft; 14-Central drive assembly; 15-Wet clutch; 16-Spline sleeve; 17-Output drive gear; 18-Output driven gear. Detailed Implementation

[0027] The principles and features of this utility model are described below. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0028] This utility model refers to Figure 1 .

[0029] This utility model provides a tractor power output transmission structure, including an input gear shaft 1, a shift gear shaft 2, and an extension transmission shaft 3 arranged coaxially. The first end of the shift gear shaft 2 is rotatably connected to the second end of the input gear shaft 1, and the second end of the shift gear shaft 2 is drive-connected to the first end of the extension transmission shaft 3. The second end of the extension transmission shaft 3 is drive-connected to a power output shaft 5. A shift gear train is also sleeved on the shift gear shaft 2, and a multi-gear shaft 4 is also provided on one side of the shift gear shaft 2. The shift gear train and the second end of the input gear shaft 1 are drive-connected to the multi-gear shaft 4, respectively.

[0030] principle: During installation, the first end of the input gear shaft 1 is connected to the engine output shaft for transmission. The power output shaft 5 is located at the rear of the tractor, i.e., the PTO output shaft, which is used to connect external agricultural implements and provide them with power. The input gear shaft 1, the shift gear shaft 2, the extension drive shaft 3, the multi-gear shaft 4, and the power output shaft 5 can all be connected to the housing or the frame through bearing transmission.

[0031] During operation, the engine's power is transmitted to the input gear shaft 1, which in turn transmits power to the multi-gear shaft 4. The multi-gear shaft 4 drives each gear of the shift gear train to rotate freely on the shift gear shaft 2, with each gear rotating at a different speed. By operating the shift gear train, a specific gear is made to drive the shift gear shaft 2, causing it to rotate at that gear's speed, thus completing gear shifting. The shift gear shaft 2 drives the extension drive shaft 3 to rotate, which transmits power to the rear of the tractor and drives the power take-off shaft 5 to rotate. The power take-off shaft 5 then outputs power to externally mounted agricultural implements.

[0032] This invention utilizes a coaxial arrangement of the input gear shaft 1, the shift gear shaft 2, and the extension transmission shaft 3, resulting in a long power transmission distance. Simultaneously, a multi-gear shaft 4 is positioned on one side of the shift gear shaft 2. This multi-gear shaft 4 receives power from the input gear shaft 1 and transmits it to the shift gear train on the shift gear shaft 2. Therefore, by simply operating the engagement / disengagement relationship between the shift gear shaft 2 and the shift gear train, the rotational speed transmitted from the shift gear shaft 2 to the power output shaft 5 can be changed, making shifting convenient. Furthermore, multiple gears are achieved on two shafts, resulting in a compact structure with multiple power output gears, adaptable to a wider range of work tools and operating conditions.

[0033] Furthermore, the gear shifting system includes a high-gear engagement sleeve 6, a low-reverse gear engagement sleeve 7, a middle-gear driven wheel 8, and a low-gear driven wheel 9. The high-gear engagement sleeve 6 and the low-reverse gear engagement sleeve 7 are both connected to the gear shifting shaft 2 for transmission. The middle-gear driven wheel 8 and the low-gear driven wheel 9 are both rotatably sleeved on the gear shifting shaft 2 and mesh with the multi-gear shaft 4 for transmission. The high-gear engagement sleeve 6 is located between the input gear shaft 1 and the middle-gear driven wheel 8, and can slide axially to mesh with the input gear shaft 1 or with the middle-gear driven wheel 8. The low-reverse gear engagement sleeve 7 is located on one side of the low-gear driven wheel 9, and can slide axially to mesh with or disengage from the low-gear driven wheel 9.

[0034] Note: The transmission from input gear shaft 1 to multi-gear shaft 4 is a reduction gear transmission; the transmission from multi-gear shaft 4 to intermediate driven gear 8 is a constant speed transmission; and the transmission from multi-gear shaft 4 to low driven gear 9 is a reduction gear transmission. Gear states: In high gear and mid-high gear, the engagement sleeve 6 engages with input gear shaft 1, and the power from input gear shaft 1 is directly transmitted to the shift gear shaft 2 via the mid-high gear engagement sleeve 6 without reduction. In medium gear and mid-high gear, the engagement sleeve 6 engages with medium driven gear 8, and the power from input gear shaft 1 is transmitted to multi-gear shaft 4, undergoes one reduction, and then is transmitted to the shift gear shaft 2 via the medium driven gear 8 and mid-high gear engagement sleeve 6. In both high and medium gear states, the low reverse gear engagement sleeve 7 is located in the middle and disengaged from the low driven gear 9. The low gear and medium / high gear engagement sleeve 6 is located in the middle and disengages from the input gear shaft 1 and the medium gear driven wheel 8; the low reverse gear engagement sleeve 7 engages with the low gear driven wheel 9, and the power of the input gear shaft 1 is transmitted to the multi-gear shaft 4 for one reduction. The multi-gear shaft 4 transmits the power to the low gear driven wheel 9 for another reduction. The power of the two reductions is transmitted to the shift gear shaft 2 through the low reverse gear engagement sleeve 7.

[0035] The system achieves at least three gears through the high-speed engagement sleeve 6 and the low-speed reverse engagement sleeve 7, making operation convenient. At the same time, the shift shaft 2 is coaxially connected with the input gear shaft 1, allowing the high-speed engagement sleeve 6 to directly engage with the second end of the input gear shaft 1 for gear shifting. This results in fewer gears, better compactness, and when outputting in high gear, it eliminates the need for the power from the input gear shaft 1 to be transferred through the multi-gear shaft 4, thus improving the overall transmission efficiency of high-speed output.

[0036] Furthermore, a reverse gear driven wheel 10 is rotatably sleeved on the shift shaft 2, and the low reverse gear engagement sleeve 7 is located between the low gear driven wheel 9 and the reverse gear driven wheel 10; it also includes a reverse gear idler wheel 12, and the reverse gear driven wheel 10 and the multi-gear shaft 4 are respectively engaged with the reverse gear idler wheel 12.

[0037] Note: The above configuration includes gear positions. The high gear engagement sleeve 6 is located in the middle and is disengaged from the input gear shaft 1 and the medium gear driven wheel 8. The low reverse gear engagement sleeve 7 engages with the reverse gear driven wheel 10. The power of the input gear shaft 1 is transmitted sequentially to the shift gear shaft 2 via the multi-gear shaft 4, the reverse idler wheel 12, the reverse gear driven wheel 10, and the low reverse gear engagement sleeve 7.

[0038] Preferably, the intermediate gear driven wheel 8, the low gear driven wheel 9, and the reverse gear driven wheel 10 are all connected to the shift shaft 2 via needle roller bearings.

[0039] It enables reverse gear output, thus the gear structure is configured with 3 forward gears + 1 reverse gear for a total of 4 gears, which can be adapted to more operating tools and working conditions.

[0040] Furthermore, it also includes a reverse gear shaft 11, which is fixed to an external fixed structure; the reverse idler wheel 12 is rotatably sleeved on the reverse gear shaft 11.

[0041] Preferably, the reverse idler gear 12 is connected to the reverse gear shaft 11 via a needle roller bearing. Furthermore, the reverse gear shaft 11 is fixed to the outer housing.

[0042] The stability of the reverse idler gear 12 has been improved.

[0043] Furthermore, the second end of the input gear shaft 1 is provided with a coupling groove, and the first end of the shift shaft 2 extends into the coupling groove and is connected to the side wall of the coupling groove through a bearing.

[0044] By having the first end of the shift shaft 2 extend into the coupling groove, the surface of the shift shaft 2 connects better with the input gear shaft 1, and the intermediate and high gear engagement sleeve 6 engages more easily with the input gear shaft 1, avoiding jamming during shifting and making shifting smoother. At the same time, the shift shaft 2 is installed using the second end of the input gear shaft 1, and the two can share a common external fixing structure for installation, saving the support structure required when installing one end of the shift shaft 2 and improving compactness.

[0045] Furthermore, it also includes a travel drive shaft 13 and a central drive assembly 14, with one end of the travel drive shaft 13 being connected to the central drive assembly 14; the multi-gear shaft 4 is a hollow shaft, and the multi-gear shaft 4 is rotatably sleeved on the travel drive shaft 13.

[0046] Note: The travel drive shaft 13 and the central drive assembly 14 are common structures on tractors and belong to existing technology; the two sides of the central drive assembly 14 transmit power to the tires through the half-shaft assembly to achieve travel.

[0047] Preferably, the multi-gear shaft 4 is connected to the travel drive shaft 13 via bearings. Furthermore, both ends of the travel drive shaft 13 are connected to the external frame or housing via bearings.

[0048] By utilizing the space on the travel drive shaft 13 to install the multi-gear shaft 4, the structural compactness is improved, and the arrangement of the multi-gear shaft 4 does not require additional space. It can be implemented on the existing tractor drive space, thus reducing the implementation cost.

[0049] Furthermore, a wet clutch 15 is also installed at the first end of the input gear shaft 1, and the input shaft of the wet clutch 15 is used to connect to the power source.

[0050] Preferably, the input shaft of the wet clutch 15 is connected to the output shaft of the engine.

[0051] The wet clutch 15 receives power and transmits it to the input gear shaft 1. The power transmission and interruption operation are simple, which can improve the work efficiency and bring convenience to the user.

[0052] Furthermore, a spline sleeve 16 is provided between the shift shaft 2 and the extension drive shaft 3, and the second end of the shift shaft 2 and the first end of the extension drive shaft 3 both extend into the spline sleeve 16 and engage with the spline sleeve 16.

[0053] After the gear shift shaft 2 is installed, the spline sleeve 16 is fitted onto its second end, and then the first end of the extension drive shaft 3 is inserted into the spline sleeve 16. The second end is connected to the external frame through a bearing. The installation is convenient and the transmission efficiency is high.

[0054] Furthermore, an output drive wheel 17 is fixed to the second end of the extended transmission shaft 3, and an output driven wheel 18 is fixed to the power output shaft 5, with the output drive wheel 17 meshing with the output driven wheel 18.

[0055] It facilitates the transmission between the extended drive shaft 3 and the power output shaft 5, and the power output shaft 5 can be disassembled and installed separately, which is convenient and has low maintenance costs.

[0056] Furthermore, the output drive wheel 17 is integrally formed with the extended drive shaft 3; bearing mounting positions are provided on both sides of the output drive wheel 17 and both sides of the output driven wheel 18.

[0057] Note: The output drive wheel 17 and the extended drive shaft 3 are manufactured from the same shaft, with a thickened part reserved at the second end and cut into a gear shape, thus forming an integral piece.

[0058] It is easy to process, and the output drive wheel 17 has high strength and long service life. Through the bearing mounting position, both sides of the output drive wheel 17 and both sides of the output driven wheel 18 can be mounted on the external frame through bearings, which improves the stability of the extended drive shaft 3 and the power output shaft 5.

[0059] In the description of this utility model, it should be understood that if descriptive terms indicating orientation, direction, or positional relationship appear, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of understanding this utility model and simplifying the description, and does not indicate or imply that the part, element, or whole referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0060] Furthermore, if sequential descriptive terms such as "first," "second," etc., appear, their purpose in this specification is for ease of understanding or simplification. For example, to distinguish multiple technical features of the same type or function, which must be mentioned separately, this specification may use prefixes or suffixes to differentiate them. Therefore, they should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first," "second," etc., may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this utility model, if descriptive terms describing structural relationships are used, such as "installation," "connection," "joining," and "fixing," they should be interpreted broadly unless otherwise explicitly specified and limited. For example, "installation," "connection," and "joining" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. "Fixing" can refer to an integral fixation or a detachable fixation using fasteners; it can be a direct fixation or a fixation through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood based on the specific circumstances, the context, and the coherence of the preceding and following text.

[0062] In this utility model, if descriptive terms containing subordinate or connecting meanings appear, such as "above" or "below" the second feature, they should not be interpreted restrictively unless otherwise explicitly specified and limited. For example, "above" or "below" can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood according to the specific circumstances, the context, and the coherence of the preceding and following text.

[0063] Furthermore, "above," "on top of," and "above" the first feature in relation to the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments, examples, and features described in this specification, and such combinations or integrations should all fall within the scope of the present invention.

[0065] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Variations, modifications, substitutions, and modifications made by those skilled in the art to the above embodiments within the scope of information available through public channels and in conjunction with the technical teachings given in this application are still covered within the protection scope of this application.

Claims

1. A tractor power take-off drive arrangement, characterised in that: The system includes an input gear shaft (1), a shift gear shaft (2), and an extension drive shaft (3) arranged coaxially. The first end of the shift gear shaft (2) is rotatably connected to the second end of the input gear shaft (1), and the second end of the shift gear shaft (2) is drive-connected to the first end of the extension drive shaft (3). The second end of the extension drive shaft (3) is drive-connected to a power output shaft (5). A shift gear train is also fitted on the shift gear shaft (2), and a multi-gear shaft (4) is also provided on one side of the shift gear shaft (2). The shift gear train and the second end of the input gear shaft (1) are drive-connected to the multi-gear shaft (4).

2. The tractor power take-off drive structure of claim 1, wherein: The gear shifting gear system includes a high-gear engagement sleeve (6), a low-reverse gear engagement sleeve (7), a middle-gear driven wheel (8), and a low-gear driven wheel (9). The high-gear engagement sleeve (6) and the low-reverse gear engagement sleeve (7) are both connected to the gear shifting shaft (2) for transmission. The middle-gear driven wheel (8) and the low-gear driven wheel (9) are both rotatably sleeved on the gear shifting shaft (2) and mesh with the multi-gear shaft (4) for transmission. The high-gear engagement sleeve (6) is located between the input gear shaft (1) and the middle-gear driven wheel (8) and can slide axially to mesh with the input gear shaft (1) or with the middle-gear driven wheel (8). The low-reverse gear engagement sleeve (7) is located on one side of the low-gear driven wheel (9) and can slide axially to mesh with or disengage from the low-gear driven wheel (9).

3. The tractor power take-off drive structure of claim 2, wherein: The shift shaft (2) is also rotatably fitted with a reverse gear driven wheel (10), and the low reverse gear engagement sleeve (7) is located between the low gear driven wheel (9) and the reverse gear driven wheel (10); it also includes a reverse gear idler wheel (12), and the reverse gear driven wheel (10) and the multi-gear shaft (4) are respectively engaged with the reverse gear idler wheel (12).

4. The tractor power take-off drive structure of claim 3, wherein: It also includes a reverse gear shaft (11), which is fixed to an external fixed structure; the reverse idler wheel (12) is rotatably sleeved on the reverse gear shaft (11).

5. The tractor power take-off drive structure of claim 2, wherein: The second end of the input gear shaft (1) is provided with a coupling groove, and the first end of the gear shift shaft (2) extends into the coupling groove and is connected to the side wall of the coupling groove through a bearing.

6. The tractor power take-off drive structure of claim 1, wherein: It also includes a travel drive shaft (13) and a central drive assembly (14), one end of which is connected to the central drive assembly (14) for transmission; the multi-gear shaft (4) is a hollow shaft, and the multi-gear shaft (4) is rotatably sleeved on the travel drive shaft (13).

7. The tractor power take-off drive structure of claim 1, wherein: The first end of the input gear shaft (1) is also equipped with a wet clutch (15), the input shaft of which is used to connect to the power source.

8. The tractor power take-off drive structure of claim 1, wherein: A spline sleeve (16) is provided between the shift shaft (2) and the extension drive shaft (3). The second end of the shift shaft (2) and the first end of the extension drive shaft (3) both extend into the spline sleeve (16) and mesh with the spline sleeve (16).

9. The tractor power take-off drive structure of claim 1, wherein: The second end of the extended transmission shaft (3) is fixed with an output drive wheel (17), and the power output shaft (5) is fixed with an output driven wheel (18). The output drive wheel (17) meshes with the output driven wheel (18).

10. The tractor power take-off drive structure of claim 9, wherein: The output drive wheel (17) and the extended drive shaft (3) are integrally formed; bearing mounting positions are provided on both sides of the output drive wheel (17) and both sides of the output driven wheel (18).

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