Multi-gear interval power gear shifting tractor gearbox

Abstract

The utility model discloses a multi-gear interval power shifting tractor gearbox, which is characterized in that power passing through an input shaft can be transmitted to a first intermediate shaft through any one of four groups of gear clutch devices to perform four-gear output; the power on the first intermediate shaft can be transmitted to the second intermediate shaft through the two-gear shifting device for two-gear output; the power on the first intermediate shaft can also be transmitted to the second intermediate shaft from the retreating gear shifting device to be output after passing through the idle wheel part; the power on the second intermediate shaft can be transmitted to the front axle output shaft through the two-gear high-low gear shifting device for two-gear output; power on the front axle output shaft can be transmitted to the rear axle output shaft through the rear axle disengaging device to be output, and power on the input shaft or power on the idle wheel component can be transmitted to the oil pump to be output. In this way, an output mode of 16 forward gears and 8 reverse gears can be formed, and when the vehicle is in a dragging working condition, the oil pump continuously obtains power.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of gearbox, especially to a multi-gear interval power gear shifting tractor gearbox. BACKGROUND

[0002] The tractor needs to face various different working conditions in actual work, including walking, plowing and ridging operation mode, and the working environment of the tractor is also changing at any time when the tractor is working, including paddy field, dry field and mud field operation environment, and the tractor will often be stuck when working. The working gear of the existing tractor is less, in order to meet the diversified needs, the tractor needs to provide more working gears. When the vehicle is in the towing working condition, the oil pump is also in the shutdown device because the gearbox does not work, which causes dry friction of the internal structure of the vehicle without lubricating oil source. SUMMARY

[0003] In order to solve the problems in the prior art, the purpose of the utility model is to provide a multi-gear interval power gear shifting tractor gearbox, which can provide more forward gears and reverse gears, so that the gearbox can adapt to various working conditions.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme: a multi-gear interval power gear shifting tractor gearbox, comprising an input component, a first intermediate shaft component, a second intermediate shaft component, an idler component, a front axle output component, a rear axle output component and an oil pump shaft component;

[0005] The power of the input shaft on the input component can be transmitted to the first intermediate shaft of the first intermediate shaft component through any one of the four groups of gear clutch devices, so that the first intermediate shaft can output four gears power; The power on the first intermediate shaft can be transmitted to the second intermediate shaft of the second intermediate shaft component through the two gear shifting device, so that the second intermediate shaft can realize two gear output in forward direction; The power on the first intermediate shaft can also be transmitted to the second intermediate shaft of the second intermediate shaft component through the idler component and the reverse gear shifting device, so that the second intermediate shaft can output reverse power; The power on the second intermediate shaft can be transmitted to the front axle output shaft of the front axle output component through the two gear high-low gear shifting device, so that the front axle output shaft can output high speed or low speed; The power on the front axle output shaft can be transmitted to the rear axle output shaft of the rear axle output component through the rear axle disengaging device, so that the front axle output shaft can output alone, or the front axle output shaft and the rear axle output shaft can output synchronously; The power on the input shaft or the power on the idler component can be transmitted to the oil pump through the oil pump shifting device on the oil pump shaft component.

[0006] Preferably, the four sets of gear shifting clutch devices are a first gear clutch, a second gear clutch, a third gear clutch and a fourth gear clutch; the input component comprises a first gear, a third gear, a fourth gear and a fifth gear which are sleeved on the input shaft, the first gear is connected with the input shaft through the first gear clutch, the third gear is connected with the input shaft through the second gear clutch, the fourth gear is connected with the input shaft through the third gear clutch, and the fifth gear is connected with the input shaft through the fourth gear clutch.

[0007] Preferably, the first gear clutch, the second gear clutch, the third gear clutch and the fourth gear clutch are all wet clutches.

[0008] Preferably, one end of the input shaft is connected with the engine, and the other end of the input shaft is connected with the PTO power take-off device.

[0009] Preferably, the housing of the first gear clutch is provided with a first brake for implementing braking, and the housing of the fourth gear clutch is provided with a second brake for implementing braking.

[0010] Preferably, the oil pump shaft component comprises an oil pump driving shaft, and a twenty-first gear and a twenty-second gear which are sleeved on the oil pump driving shaft, the oil pump shifting device is located between the twenty-first gear and the twenty-second gear, and the twenty-first gear and the twenty-second gear are connected with the oil pump driving shaft through the oil pump shifting device; the input shaft is provided with a second gear, the second gear is engaged with the twenty-second gear; the idler component comprises an idler shaft, the idler shaft is sleeved with an idler gear, and the first intermediate shaft is connected with the twenty-first gear through the idler gear.

[0011] Preferably, the first intermediate shaft component comprises a sixth gear, a seventh gear, an eighth gear, a ninth gear, a tenth gear, an eleventh gear and a twelfth gear which are fixed on the first intermediate shaft, the seventh gear is engaged with the first gear, the ninth gear is engaged with the third gear, the eleventh gear is engaged with the fourth gear, and the twelfth gear is engaged with the fifth gear; the eighth gear and the tenth gear are connected with the second intermediate shaft through the two-gear shifting device; the sixth gear is connected with the reverse shifting device on the second intermediate shaft through the idler gear.

[0012] Preferably, the second intermediate shaft component comprises a thirteenth gear, a fourteenth gear, a fifteenth gear, a sixteenth gear and a twentieth gear, the thirteenth gear, the fourteenth gear and the fifteenth gear are sleeved on the second intermediate shaft, and the sixteenth gear and the twentieth gear are fixed on the second intermediate shaft; the thirteenth gear is engaged with the idler gear, the idler gear is connected with the second intermediate shaft through the reverse shifting device, the fourteenth gear is engaged with the sixteenth gear, the fifteenth gear is engaged with the tenth gear, and the fourteenth gear and the fifteenth gear are connected with the second intermediate shaft through the two-gear shifting device.

[0013] As a preferred, the front axle output component comprises a seventeenth gear and an eighteenth gear sleeved on the front axle output shaft, the seventeenth gear is engaged with the twentieth gear, the eighteenth gear is engaged with the sixteenth gear, and the seventeenth gear and the eighteenth gear are connected with the front axle output shaft through the high-low gear shifting device.

[0014] As a preferred, the rear axle output component comprises a twenty-fifth gear fixed on the rear axle output shaft, and the rear axle disengaging device is installed on the front axle output shaft, and the front axle output shaft and the rear axle output shaft rotate synchronously after the rear axle disengaging device is combined with the twenty-fifth gear.

[0015] The beneficial effects of the technical scheme of the utility model are as follows: the gear arrangement combination of the input component A, the intermediate shaft component, the intermediate shaft component, the idler component DD, the front axle output component E, the rear axle output component F and the oil pump shaft component G can form 16 forward gears and 8 reverse gears, and 4 interval power shifts; the meshing sleeve shifting device on the front axle enables the vehicle to select whether to form a four-wheel drive mode; the oil pump can obtain power from the input component A under the working condition of the gearbox operation; meanwhile, the oil pump can also obtain power from the front axle component under the condition that the gearbox does not work and the vehicle is in a towing working condition to supply oil for the gearbox system. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The transmission of the multi-gear interval power shift tractor gearbox is simple Figure One ;

[0017] Figure 2 The transmission of the multi-gear interval power shift tractor gearbox is simple Figure Two .

[0018] Reference numerals: 1, input shaft; 2, first gear; 3, first gear clutch; 4, first brake; 5, second gear; 6, third gear; 7, second gear clutch; 8, third gear clutch; 9, fourth gear; 10, second brake; 11, fourth gear clutch; 12, fifth gear; 13, first intermediate shaft; 14, sixth gear; 15, seventh gear; 16, eighth gear; 17, ninth gear; 18, tenth gear; 19, eleventh gear; 20, twelfth gear; 21, second intermediate shaft; 22, thirteenth gear; 23, reverse gear shifting device; 24, fourteenth gear; 25, two-gear shifting device; 26, fifteenth gear; 27, twentieth gear; 28, sixteenth gear; 29, front axle output shaft; 30, seventeenth gear; 31, two-gear high-low gear shifting device; 32, eighteenth gear; 33, rear axle disconnect device; 34, rear axle output shaft; 35, idler shaft; 36, idler gear; 37, oil pump drive shaft; 38, twenty-first gear; 39, oil pump gear shifting device; 40, twenty-second gear; 41, twenty-third gear; 42, twenty-fourth gear; 43, oil pump input shaft; 44, oil pump;

[0019] A, input component; B, first intermediate shaft component; C, second intermediate shaft component; D, idler component; E, front axle output component; F, rear axle output component; G, oil pump shaft component. DETAILED DESCRIPTION

[0020] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0021] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0022] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are only used for descriptive purpose and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more than two, unless otherwise explicitly limited.

[0023] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0024] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature. Embodiment

[0025] As Figure 1 and Figure 2 A multi-gear range power shift tractor gearbox as shown comprises an input component A, a first intermediate shaft component B, a second intermediate shaft component C, an idler component D, a front axle output component E, a rear axle output component F and an oil pump shaft component G;

[0026] The power through the input shaft 1 on the input component A can be transmitted to the first intermediate shaft 13 of the first intermediate shaft component B through any one of the four sets of gear clutch devices, so that the first intermediate shaft 13 can output four-gear power;

[0027] The power on the first intermediate shaft 13 can be transmitted to the second intermediate shaft 21 of the second intermediate shaft component C through the two-gear shift device 25, so that the second intermediate shaft 21 can realize two-gear output in the forward direction;

[0028] The power on the first intermediate shaft 13 can also be transmitted to the second intermediate shaft 21 of the second intermediate shaft component C from the reverse gear device 23 through the idler component D, so that the second intermediate shaft 21 can output reverse power;

[0029] The power on the second intermediate shaft 21 can be transmitted to the front axle output shaft 29 of the front axle output component E through the two-gear high-low gear device 31, so that the front axle output shaft 29 can output at high speed or low speed;

[0030] The power on the front axle output shaft 29 can be transmitted to the rear axle output shaft 34 of the rear axle output component F through the rear axle disengaging device 33, so that the front axle output shaft 29 can output alone or the front axle output shaft 29 and the rear axle output shaft 34 can output synchronously;

[0031] The power on the input shaft 1 or the power on the idler component can be transmitted to the oil pump through the oil pump gear device on the oil pump shaft component G.

[0032] In this way, through the gear arrangement combination of the input component A, the intermediate shaft component, the intermediate shaft component, the idler component DD, the front axle output component E, the rear axle output component F and the oil pump shaft component G, 16 forward gears and 8 reverse gears can be formed, and 4 interval power gear shifts can be formed. Through the meshing sleeve gear device on the front axle, the vehicle can select whether to form a four-wheel drive mode. The oil pump can obtain power from the input component A under the working condition of the transmission; at the same time, the oil pump can also obtain power from the front axle component when the transmission is not working and the vehicle is in a towing working condition, to supply oil for the transmission system.

[0033] In the embodiment, the four sets of gear clutches are a first clutch 3, a second clutch 7, a third clutch 8 and a fourth clutch 11, and the first clutch 3, the second clutch 7, the third clutch 8 and the fourth clutch 11 are all wet clutches. The input component A includes a first gear 2, a third gear 6, a fourth gear 9 and a fifth gear 12 which are all sleeved on the input shaft 1. The first gear 2 is connected to the input shaft 1 through the first clutch 3, the third gear 6 is connected to the input shaft 1 through the second clutch 7, the fourth gear 9 is connected to the input shaft 1 through the third clutch 8, and the fifth gear 12 is connected to the input shaft 1 through the fourth clutch 11. The specific structure and connection mode of the clutches, gears and input shaft 1 can refer to the existing technical documents with publication numbers CN220910383U, CN220452673U and CN207961343U.

[0034] Further preferably, the outer gear rings of the first gear 2, the third gear 6, the fourth gear 9 and the fifth gear 12 are different in size.

[0035] More preferably, one end of the input shaft 1 is connected to the engine, and the other end of the input shaft 1 is connected to the PTO power take-off device.

[0036] Further preferably, a first brake 4 for applying braking is provided on the housing of the first gear clutch 3, and a second brake 10 for applying braking is provided on the housing of the fourth gear clutch 11. The second gear clutch 7 and the third gear clutch 8 are located between the first gear clutch 3 and the fourth gear clutch 11; thus, auxiliary braking of the vehicle is achieved by using two sets of brakes to assist the input component A, and the two sets of brakes are located on the left and right sides of the four clutches, making the transmission easy to assemble and maintain. For the specific structure and connection method of the clutches and brakes, please refer to existing technical documents such as CN212297438U, CN207961343U, and CN201043581Y.

[0037] In this embodiment, the oil pump shaft component G includes an oil pump drive shaft 37, and a 21st gear 38 and a 22nd gear 40 loosely fitted on the oil pump drive shaft 37. The oil pump shifting device 39 is a two-speed synchronizer, located between the 21st gear 38 and the 22nd gear 40. The 21st gear 38 and the 22nd gear 40 can be connected to the oil pump drive shaft 37 through the oil pump shifting device 39. A second gear 5 is installed on the input shaft 1, and the second gear 5 meshes with the 22nd gear 40. The idler gear component D includes an idler gear shaft 35, on which an idler gear 36 is loosely fitted. The first intermediate shaft 13 is connected to the 21st gear 38 through the idler gear 36.

[0038] After the oil pump shifting device 39 is engaged with the twenty-first gear 38, power can enter the oil pump via the idler gear component D, the twenty-first gear 38, the oil pump shifting device 39, and the oil pump drive shaft 37. After the oil pump shifting device 39 is engaged with the twenty-second gear 40, power can enter the oil pump via the input shaft 1, the second gear 5, the oil pump shifting device 39, and the oil pump drive shaft 37.

[0039] With this configuration, input shaft 1 can always provide power to the oil pump during the operation of the transmission; during vehicle towing, the power fed back to the transmission from the front and rear axles can be fed back to the oil pump through the idler pulley instead of through input shaft 1, thus ensuring the operation of the oil pump while avoiding power shock to the engine.

[0040] In this embodiment, a twenty-third gear 41 is fixed on the oil pump drive shaft 37, and a twenty-fourth gear 42 is installed on the oil pump input shaft 43. The twenty-third gear 41 and the twenty-fourth gear 42 mesh with each other.

[0041] In this embodiment, the first intermediate shaft 13 component B includes a sixth gear 14, a seventh gear 15, an eighth gear 16, a ninth gear 17, a tenth gear 18, an eleventh gear 19, and a twelfth gear 20 fixed on the first intermediate shaft 13. The seventh gear 15 meshes with the first gear 2, the ninth gear 17 meshes with the third gear 6, the eleventh gear 19 meshes with the fourth gear 9, and the twelfth gear 20 meshes with the fifth gear 12. The eighth gear 16 and the tenth gear 18 can be connected to the second intermediate shaft 21 through a two-speed shifting device. The sixth gear 14 is connected to the retraction clutch on the second intermediate shaft 21 through an idler gear 36.

[0042] In this embodiment, the second intermediate shaft component C includes a thirteenth gear 22, a fourteenth gear 24, a fifteenth gear 26, a sixteenth gear 28, and a twentieth gear 27. The thirteenth gear 22, fourteenth gear 24, and fifteenth gear 26 are loosely fitted onto the second intermediate shaft 21, while the sixteenth gear 28 and twentieth gear 27 are fixed to the second intermediate shaft 21. The thirteenth gear 22 meshes with an idler gear 36, which is connected to the second intermediate shaft 21 via a reverse shifting device 23. The fourteenth gear 24 meshes with the sixteenth gear 28, and the fifteenth gear 26 meshes with the tenth gear 18. The fourteenth gear 24 and the fifteenth gear 26 can be connected to the second intermediate shaft 21 via a forward clutch device. Specifically, the reverse shifting device 23 is a synchronizer.

[0043] In this embodiment, the front axle output component E includes a seventeenth gear 30 and an eighteenth gear 32 loosely fitted on the front axle output shaft 29. The seventeenth gear 30 meshes with the twentieth gear 27, and the eighteenth gear 32 meshes with the sixteenth gear 28. The seventeenth gear 30 and the eighteenth gear 32 can be connected to the front axle output shaft 29 via a high-low gear shifting device 31. The high-low gear shifting device 31 is a two-speed synchronizer.

[0044] When the high / low gear shifting device 31 engages with the seventeenth gear 30 on the left, the power on the second intermediate shaft 21 is output at high speed through the front axle output shaft 29 via the twentieth gear 27, the seventeenth gear 30, and the high / low gear shifting device 31; when the high / low gear shifting device 31 engages with the eighteenth gear 32 on the right, the power on the second intermediate shaft 21 is output at low speed through the sixteenth gear 28, the eighteenth gear 32, and the high / low gear shifting device 31.

[0045] More preferably, the seventeenth gear 30 and the eighteenth gear 32 are of different sizes, with the outer gear ring of the seventeenth gear 30 being smaller than that of the eighteenth gear 32.

[0046] In this embodiment, the rear axle output component F includes a 25th gear fixed on the rear axle output shaft 34. The rear axle disengagement device 33 is a synchronizer, which is mounted on the front axle output shaft 29. After the synchronizer engages with the 25th gear, the front axle output shaft 29 and the rear axle output shaft 34 rotate synchronously. In this way, the four-wheel drive output and two-wheel drive output switching of the transmission are realized through the synchronizer.

[0047] In this embodiment, the specific structure and connection method of the synchronizer, gear and shaft in the first intermediate shaft component B, the second intermediate shaft component C, the front axle component and the rear axle component can be referred to the prior art documents such as CN220452657U, CN112013038A and CN116624572A.

[0048] This transmission structure can generate 16 forward gears and 8 reverse gears through the gear arrangement of input component A, intermediate shaft component, idler gear component DD, front axle output component E, and rear axle output component F. The transmission structure also features 4-range power shifting. The rear axle disengagement device 33 allows the vehicle to select whether to enter four-wheel drive mode. The above structure can also meet the system oil supply when there is no power input during towing. The first brake 4 and the second brake 10 can achieve auxiliary braking of the vehicle through the auxiliary brake driven by input component A.

[0049] 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. In this specification, the illustrative expressions of the above terms 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.

[0050] 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. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A multi-gear range power shift tractor gearbox, characterized in that: It includes an input component (A), a first intermediate shaft component (B), a second intermediate shaft component (C), an idler wheel component (D), a front axle output component (E), a rear axle output component (F), and an oil pump shaft component (G). The power transmitted through the input shaft (1) of the input component (A) can be transmitted to the first intermediate shaft (13) of the first intermediate shaft component (B) through any one of the four gear clutch devices, so that the first intermediate shaft (13) can output four gear power. The power on the first intermediate shaft (13) can be transmitted to the second intermediate shaft (21) of the second intermediate shaft component (C) through the two-speed shifting device (25), so that the second intermediate shaft (21) can achieve two-speed output in the forward direction; The power on the first intermediate shaft (13) can also be transmitted from the reverse gear shifting device (23) to the second intermediate shaft (21) of the second intermediate shaft component (C) through the idler wheel component (D), so that the second intermediate shaft (21) can output reverse power; The power on the second intermediate shaft (21) can be transmitted to the front axle output shaft (29) of the front axle output component (E) through the two-speed high-low gear shifting device (31), so that the front axle output shaft (29) can output at high speed or low speed. The power on the front axle output shaft (29) can be transmitted to the rear axle output shaft (34) of the rear axle output component (F) through the rear axle disengagement device (33), so that the front axle output shaft (29) can output independently, or the front axle output shaft (29) and the rear axle output shaft (34) can output synchronously. The power on the input shaft (1) or the power on the idler wheel component (D) can be transmitted to the oil pump (44) through the oil pump shifting device on the oil pump shaft component (G).

2. The multi-gear range power shift tractor gearbox according to claim 1, characterized in that: The four gear clutch devices are a first gear clutch (3), a second gear clutch (7), a third gear clutch (8), and a fourth gear clutch (11); the input component (A) includes a first gear (2), a third gear (6), a fourth gear (9), and a fifth gear (12) that are loosely fitted on the input shaft (1). The first gear (2) is connected to the input shaft (1) through the first gear clutch (3), the third gear (6) is connected to the input shaft (1) through the second gear clutch (7), the fourth gear (9) is connected to the input shaft (1) through the third gear clutch (8), and the fifth gear (12) is connected to the input shaft (1) through the fourth gear clutch (11).

3. The multi-gear range power shift tractor gearbox according to claim 2, characterized in that: The first gear clutch (3), second gear clutch (7), third gear clutch (8) and fourth gear clutch (11) are all wet clutches.

4. A multi-gear range power shift tractor gearbox according to claim 2, characterized in that: One end of the input shaft (1) is connected to the engine, and the other end of the input shaft (1) is connected to the PTO power take-off device.

5. A multi-gear range power shift tractor gearbox according to claim 2, characterized in that: The first brake (4) for applying braking is provided on the housing of the first gear clutch (3), and the second brake (10) for applying braking is provided on the housing of the fourth gear clutch (11).

6. A multi-gear range power shift tractor gearbox according to claim 2, characterized in that: The oil pump shaft assembly (G) includes an oil pump drive shaft (37), and a 21st gear (38) and a 22nd gear (40) loosely fitted on the oil pump drive shaft (37). An oil pump shifting device (39) is located between the 21st gear (38) and the 22nd gear (40). The 21st gear (38) and the 22nd gear (40) can be connected to the oil pump drive shaft (37) through the oil pump shifting device (39). A second gear (5) is installed on the input shaft (1), and the second gear (5) meshes with the 22nd gear (40). The idler assembly (D) includes an idler shaft (35), on which an idler gear (36) is loosely fitted. The first intermediate shaft (13) is connected to the 21st gear (38) through the idler gear (36).

7. A multi-gear range power shift tractor gearbox according to claim 6, characterized in that: The first intermediate shaft component (B) includes a sixth gear (14), a seventh gear (15), an eighth gear (16), a ninth gear (17), a tenth gear (18), an eleventh gear (19), and a twelfth gear (20) fixed on the first intermediate shaft (13). The seventh gear (15) meshes with the first gear (2), the ninth gear (17) meshes with the third gear (6), the eleventh gear (19) meshes with the fourth gear (9), and the twelfth gear (20) meshes with the fifth gear (12). The eighth gear (16) and the tenth gear (18) can be connected to the second intermediate shaft (21) through a two-speed shifting device (25). The sixth gear (14) is connected to the reverse shifting device (23) on the second intermediate shaft (21) through an idler gear (36).

8. A multi-gear range power shift tractor gearbox according to claim 7, characterized in that: The second intermediate shaft component (C) includes a thirteenth gear (22), a fourteenth gear (24), a fifteenth gear (26), a sixteenth gear (28), and a twentieth gear (27). The thirteenth gear (22), fourteenth gear (24), and fifteenth gear (26) are loosely fitted on the second intermediate shaft (21), while the sixteenth gear (28) and twentieth gear (27) are fixed on the second intermediate shaft (21). The thirteenth gear (22) meshes with the idler gear (36), which is connected to the second intermediate shaft (21) via a reverse shifting device (23). The fourteenth gear (24) meshes with the sixteenth gear (28), and the fifteenth gear (26) meshes with the tenth gear (18). The fourteenth gear (24) and the fifteenth gear (26) can be connected to the second intermediate shaft (21) via a two-speed shifting device (25).

9. A multi-gear range power shift tractor gearbox according to claim 8, characterized in that: The front axle output component (E) includes a seventeenth gear (30) and an eighteenth gear (32) loosely fitted on the front axle output shaft (29). The seventeenth gear (30) meshes with the twentieth gear (27), and the eighteenth gear (32) meshes with the sixteenth gear (28). The seventeenth gear (30) and the eighteenth gear (32) can be connected to the front axle output shaft (29) through a two-speed high-low gear shifting device (31).

10. A multi-gear range power shift tractor gearbox according to claim 9, characterized in that: The rear axle output component (F) includes a 25th gear fixed on the rear axle output shaft (34), and a rear axle disengagement device (33) is mounted on the front axle output shaft (29). After the rear axle disengagement device (33) engages with the 25th gear, the front axle output shaft (29) and the rear axle output shaft (34) rotate synchronously.

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