Power shifting gearbox of agricultural tractor chassis

Abstract

The utility model discloses a power shift gearbox of an agricultural tractor chassis, which comprises a first splicing shell, a second splicing shell and a third splicing shell, and the first splicing shell, the second splicing shell and the third splicing shell are sequentially connected to form an outer shell of the gearbox; a first transmission shaft, a first hydraulic wet clutch, a second transmission shaft and a second hydraulic wet clutch are arranged in the second splicing shell; the front ends of the first transmission shaft, the first hydraulic wet clutch, the second transmission shaft and the second hydraulic wet clutch are connected with the first splicing shell, the rear ends of the first transmission shaft and the second transmission shaft are inserted into the third splicing shell, and the second transmission shaft is arranged above the first transmission shaft. The first hydraulic wet clutch and the second hydraulic wet clutch are arranged on the two sides of the first transmission shaft and the second transmission shaft respectively, power does not need to be interrupted, continuity of power output of a tractor is guaranteed, operation efficiency is effectively improved, and meanwhile impact on a transmission system is reduced.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, specifically to a power shift gearbox for an agricultural tractor chassis. Background Technology

[0002] In modern agricultural production, agricultural tractors serve as core power equipment, undertaking various tasks such as tilling, sowing, and harvesting. The gearbox, as a key component of the tractor chassis, directly affects the tractor's working efficiency, fuel economy, and operational comfort. Traditional agricultural tractor gearboxes mostly employ a manual shifting structure. This structure requires the driver to frequently depress the clutch pedal and manually shift gears. In the complex and ever-changing farmland working environment, the driver not only needs to constantly monitor the work situation but also frequently shift gears, which greatly increases the driver's workload, easily leading to fatigue driving and consequently affecting work quality and safety. Moreover, during manual shifting, power is interrupted, resulting in discontinuous power output from the tractor. This not only reduces working efficiency but also causes significant stress on the transmission system, shortening the service life of transmission components.

[0003] Although some tractors employ synchronized shifting mechanisms, this system still requires a considerable amount of time for the synchronizer and gears to reach synchronized speeds during shifting, resulting in a prolonged shifting time that cannot meet the demands of efficient modern agricultural operations. Furthermore, synchronizers are prone to wear over long-term use, leading to shifting difficulties and increasing maintenance costs and workload. As modern agriculture develops towards intelligence and efficiency, higher demands are placed on the shifting speed, power continuity, and ease of operation of agricultural tractor gearboxes. Existing agricultural tractor gearboxes are insufficient to meet these requirements. Therefore, developing a power shift gearbox that enables rapid, uninterrupted power shifting, is easy to operate, and highly reliable has become crucial for improving the performance and operational efficiency of agricultural tractors. Utility Model Content

[0004] The purpose of this utility model is to provide a power shift gearbox for an agricultural tractor chassis, which aims to improve the problems of power interruption and long shift time during the shifting process of existing agricultural tractor gearboxes, thereby improving the operating efficiency and operating comfort of agricultural tractors.

[0005] This utility model is implemented as follows:

[0006] A power shift gearbox for an agricultural tractor chassis includes a first splicing shell, a second splicing shell, and a third splicing shell, which are sequentially connected to form the outer casing of the gearbox. The second splicing shell houses a first drive shaft, a first hydraulic wet clutch, a second drive shaft, and a second hydraulic wet clutch. The front ends of the first drive shaft, the first hydraulic wet clutch, the second drive shaft, and the second hydraulic wet clutch are connected to the first splicing shell. The rear ends of the first and second drive shafts are inserted into the third splicing shell. The second drive shaft is positioned above the first drive shaft. The first and second hydraulic wet clutches are respectively located on either side of the first and second drive shafts.

[0007] Furthermore, the first drive shaft includes a front shaft and a rear shaft sharing a common central axis, with a clearance between the front and rear shafts. The first drive shaft is sequentially equipped with a first gear (number 1), a first gear (number 2), a first gear (number 3), and a first gear (number 4) from front to back. The first gear (number 1) is mounted on the front shaft, and the first, second, third, and fourth gears are mounted on the rear shaft. The first hydraulic wet clutch's rotating shaft is equipped with a second gear (number 1), a second gear (number 2), and a second gear (number 3) from front to back. The second gear (number 1) and second gear (number 2) mesh with the first gear (number 1) and first gear (number 2), respectively. The first hydraulic wet clutch can control the rotation of the second gear (number 2) and second gear (number 3). The second and third gears are meshed with the first and fourth gears; the second transmission shaft is provided with the third and fourth gears from front to back, and the third and fourth gears are integrated gears; the first and fourth gears are meshed with the third and third gears; the rotating shaft of the second hydraulic wet clutch is provided with the fourth and fourth gears from front to back, the fourth and fourth gears are meshed with the first and third gears, and the fourth and third gears are meshed with the third and fourth gears; the second hydraulic wet clutch can control the rotation of the fourth and fourth gears.

[0008] Furthermore, a first bearing seat and a second bearing seat are sequentially provided on the rear axle of the first drive shaft behind the first and fourth gears. The first bearing seat and the second bearing seat are respectively connected to the second splicing shell and the third splicing shell. A transmission joint is provided at the front end of the front axle. The transmission joint is used to connect to the power output end of the engine. A first oil seal seat is provided on the front axle behind the transmission joint. The first oil seal seat is used to connect to the first splicing shell.

[0009] Furthermore, both the first hydraulic wet clutch and the second hydraulic wet clutch are provided with a second oil seal seat at their front ends, and the main bodies of the first hydraulic wet clutch and the second hydraulic wet clutch are located inside the first assembly box.

[0010] Furthermore, the second drive shaft is provided with a coupling sleeve on the third gear, the coupling sleeve can be moved to the third gear, and a third bearing seat and a fourth bearing seat are provided in sequence behind the third gear, the third bearing seat and the fourth bearing seat are respectively connected to the second splicing shell and the third splicing shell.

[0011] Furthermore, the inner side of the first splicing shell is provided with three mounting holes for the shafts of the first drive shaft, the first hydraulic wet clutch, and the second hydraulic wet clutch to pass through. The rear end of the first splicing shell is provided with a connecting platform, and the connecting platform is provided with multiple bolt holes.

[0012] Furthermore, the second splicing shell has a splicing joint at its front end, and the splicing joint has a connecting groove aligned with the bolt hole. The second splicing shell has a support plate on its inner side, and the support plate has through holes along the vertical direction for the first drive shaft and the second drive shaft to pass through the second splicing shell. The support plate also supports the first drive shaft and the second drive shaft.

[0013] Furthermore, the front edge of the third splicing shell is provided with multiple fixing grooves for connecting with the second splicing shell by bolts. The front end of the third splicing shell is provided with a through hole at the position aligned with the through hole, for the rear ends of the first drive shaft and the second drive shaft to pass into the interior of the third splicing shell through the through hole.

[0014] Furthermore, it also includes a shift paddle, which is sleeved on the first drive shaft, and the top of the shift paddle is connected to the engagement sleeve.

[0015] Furthermore, the top of the shift paddle is provided with a latch that engages with the engagement sleeve, and the bottom of the shift paddle is provided with a sleeve hole that fits onto the rear axle of the first drive shaft. The bottom of the shift paddle is provided with a lever, and the bottom end of the lever is provided with a connector.

[0016] Compared with existing technologies, the advantages of this utility model are:

[0017] 1. This utility model provides a second drive shaft above a first drive shaft, with a first hydraulic wet clutch and a second hydraulic wet clutch respectively installed on both sides of the first and second drive shafts. The first and second hydraulic wet clutches control the rotation of the gears above them to control the gearbox's shifting. This type of gearbox does not require interruption of power, ensuring the continuity of the tractor's power output, effectively improving work efficiency, reducing the impact on the transmission system, and extending the service life of the transmission components.

[0018] 2. This utility model uses a wet multi-plate clutch structure through a first hydraulic wet clutch and a second hydraulic wet clutch, which has good performance and can adapt to the long-term, high-load working environment of agricultural tractors, improving the reliability and stability of the gearbox and reducing maintenance costs and workload. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model with the first splicing shell open;

[0020] Figure 2 This is a schematic diagram of the overall assembly of this utility model;

[0021] Figure 3 This is a three-dimensional structural diagram of the first drive shaft, the second drive shaft, the first hydraulic wet clutch, and the second hydraulic wet clutch of this utility model.

[0022] Figure 4 This is a schematic diagram of the structure of the first drive shaft, the second drive shaft, the first hydraulic wet clutch, and the second hydraulic wet clutch of this utility model from a frontal view.

[0023] Figure 5 This is a schematic diagram of the structure of the first drive shaft, the second drive shaft, the first hydraulic wet clutch, and the second hydraulic wet clutch of this utility model from a top-down perspective.

[0024] Figure 6 This is a schematic diagram of the structure of the first drive shaft, the second drive shaft, the first hydraulic wet clutch, and the second hydraulic wet clutch of this utility model from an upward perspective.

[0025] Figure 7 This is a schematic diagram of the structure of the first transmission shaft of this utility model;

[0026] Figure 8 This is a schematic diagram of the structure of the first hydraulic wet clutch of this utility model;

[0027] Figure 9 This is a schematic diagram of the structure of the second drive shaft of this utility model;

[0028] Figure 10 This is a schematic diagram of the structure of the second hydraulic wet clutch of this utility model;

[0029] Figure 11 This is a schematic diagram of the paddle shifter of this utility model;

[0030] Figure 12 This is a structural schematic diagram of the first spliced ​​shell of this utility model;

[0031] Figure 13 This is a schematic diagram of the structure of the second splicing shell of this utility model;

[0032] Figure 14 This is a structural schematic diagram of the third splicing shell of this utility model.

[0033] In the diagram: 1. First drive shaft; 01. Front shaft; 02. Rear shaft; 101. First gear; 102. First gear; 103. First gear; 104. First gear; 105. First bearing housing; 106. Second bearing housing; 107. First oil seal housing; 108. Transmission joint; 2. First hydraulic wet clutch; 201. Second gear; 202. Second gear; 203. Second gear; 204. Second oil seal housing; 3. Second drive shaft; 301. Third gear; 302. Third gear; 303. Third gear; 304. Gears No. 3 and No. 4; 305. Third bearing housing; 306. Fourth bearing housing; 307. Engaging sleeve; 4. Second hydraulic wet clutch; 401. Gear No. 4; 402. Gear No. 4; 403. Gear No. 4; 5. First splicing shell; 51. Mounting hole; 52. Connecting platform; 53. Bolt hole; 6. Second splicing shell; 61. Splice joint; 62. Connecting groove; 63. Support plate; 64. Through hole; 7. Third splicing shell; 71. Fixing groove; 72. Through shaft hole; 8. Shift paddle; 81. Bayonet; 82. Sleeve hole; 83. Shift lever; 84. Connector. Detailed Implementation

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details:

[0036] Example 1

[0037] like Figure 1 , Figure 2 and Figure 3As shown, a power shift gearbox for an agricultural tractor chassis includes a first splicing shell 5, a second splicing shell 6, and a third splicing shell 7. The first splicing shell 5, the second splicing shell 6, and the third splicing shell 7 are connected in sequence to form the outer shell of the gearbox. This modular outer shell structure facilitates the assembly of the various components of the entire gearbox and also facilitates the protection of each component. The second splicing shell 6 is equipped with a first drive shaft 1, a first hydraulic wet clutch 2, a second drive shaft 3, and a second hydraulic wet clutch 4. The front ends of the first drive shaft 1, the first hydraulic wet clutch 2, the second drive shaft 3, and the second hydraulic wet clutch 4 are connected to the first splicing shell 5. The rear ends of the first drive shaft 1 and the second drive shaft 3 are inserted into the third splicing shell 7. The second drive shaft 3 is located above the first drive shaft 1. The first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 are respectively located on both sides of the first drive shaft 1 and the second drive shaft 3. This structure facilitates the rotation of the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 by rotating the first drive shaft 1, and also drives the rear half of the first drive shaft 1 and the second drive shaft 3 to rotate by rotating the first hydraulic wet clutch 2 or the second hydraulic wet clutch 4.

[0038] like Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10As shown, the first drive shaft 1 includes a front shaft 01 and a rear shaft 02 with a common central axis, and a gap is provided between the front shaft 01 and the rear shaft 02. The first drive shaft 1 is provided with a first gear 101, a first gear 102, a first gear 103, and a first gear 104 sequentially from front to back. The first gear 101 is mounted on the front shaft 01, and the first gear 102, first gear 103, and first gear 104 are mounted on the rear shaft 02. The first hydraulic wet clutch 2 has a second gear 104 mounted on its shaft from front to back. Gear 201, Gear 202, and Gear 203 are respectively engaged with Gear 101 and Gear 102. A first hydraulic wet clutch 2 controls the rotation of Gear 202 and Gear 203. Gear 203 is engaged with Gear 104. The second drive shaft 3 has Gear 301, Gear 302, Gear 303, and Gear 104 arranged from front to back. Gear 304, gear 303, and gear 304 are integrated gears; gear 104 meshes with gear 303; gear 401, gear 402, and gear 403 are sequentially arranged on the shaft of the second hydraulic wet clutch 4 from front to back. Gear 401 meshes with gear 101, gear 402 meshes with gear 103, and gear 403 meshes with gear 304. The two hydraulic wet clutches 4 are connected together, and the second hydraulic wet clutch 4 can control the rotation of the fourth gear 402 and the fourth gear 403. This structure facilitates the connection between the front shaft 01 of the first drive shaft 1 and the power output end of the generator. The rotation of the front shaft 01 can drive the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 to rotate, which in turn drives the rear shaft 02 and the second drive shaft 3 to rotate. Moreover, by controlling the rotation of the opposing gears through the first hydraulic real-time clutch and the second hydraulic wet clutch 4, power shifting can be achieved to achieve the purpose of rapid gear change.

[0039] like Figure 7 As shown, a first bearing seat 105 and a second bearing seat 106 are sequentially provided on the rear axle 02 of the first drive shaft 1 behind the first fourth gear 104. The first bearing seat 105 and the second bearing seat 106 are respectively connected to the second splicing shell 6 and the third splicing shell 7. A transmission joint 108 is provided at the front end of the front axle 01. The transmission joint 108 is used to connect to the power output end of the engine. A first oil seal seat 107 is provided on the front axle 01 behind the transmission joint 108. The first oil seal seat 107 is used to connect to the first splicing shell 5.

[0040] like Figure 8 and Figure 10As shown, the front ends of the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 are both provided with a second oil seal seat 204, and the main bodies of the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 are located inside the first assembly box.

[0041] like Figure 9 As shown, a coupling sleeve 307 is provided between the third gear 301 and the third gear 302 on the second drive shaft 3. The coupling sleeve 307 facilitates gear shifting in conjunction with the shifting mechanism. A third bearing housing 305 and a fourth bearing housing 306 are sequentially provided behind the third gear 302. The third bearing housing 305 and the fourth bearing housing 306 are respectively connected to the second splicing shell 6 and the third splicing shell 7, facilitating the installation and fixation of the second drive shaft 3.

[0042] like Figure 12 As shown, the inner side of the first splicing shell 5 is provided with three mounting holes 51 for the shafts of the first drive shaft 1, the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 to pass through. The rear end of the first splicing shell 5 is provided with a connecting platform 52, and the connecting platform 52 is provided with multiple bolt holes 53. The connecting platform 52 and the connecting holes facilitate the connection between the first splicing shell 5 and the second splicing shell 6.

[0043] like Figure 13 As shown, the front end of the second splicing shell 6 is provided with a splicing joint 61. The splicing joint 61 is provided with a connecting groove 62 aligned with the bolt hole 53, which facilitates a stable connection between the first splicing shell 5 and the second splicing shell 6. The inner side of the second splicing shell 6 is provided with a support plate 63. The support plate 63 has through holes 64 along the vertical direction, which are used for the first drive shaft 1 and the second drive shaft 3 to pass through the second splicing shell 6. The support plate 63 also supports the first drive shaft 1 and the second drive shaft 3.

[0044] like Figure 14 As shown, the front edge of the third splicing shell 7 is provided with multiple fixing grooves 71 for connecting with the second splicing shell 6 by bolts. The front end of the third splicing shell 7 is provided with a through shaft hole 72 at the position aligned with the through hole 64, for the rear ends of the first drive shaft 1 and the second drive shaft 3 to pass into the interior of the third splicing shell 7 through the through shaft hole 72.

[0045] Example 2

[0046] like Figure 1 , Figure 2 and Figure 3As shown, a power shift gearbox for an agricultural tractor chassis includes a first splicing shell 5, a second splicing shell 6, and a third splicing shell 7. The first splicing shell 5, the second splicing shell 6, and the third splicing shell 7 are connected in sequence to form the outer shell of the gearbox. This modular outer shell structure facilitates the assembly of the various components of the entire gearbox and also facilitates the protection of each component. The second splicing shell 6 is equipped with a first drive shaft 1, a first hydraulic wet clutch 2, a second drive shaft 3, and a second hydraulic wet clutch 4. The front ends of the first drive shaft 1, the first hydraulic wet clutch 2, the second drive shaft 3, and the second hydraulic wet clutch 4 are connected to the first splicing shell 5. The rear ends of the first drive shaft 1 and the second drive shaft 3 are inserted into the third splicing shell 7. The second drive shaft 3 is located above the first drive shaft 1. The first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 are respectively located on both sides of the first drive shaft 1 and the second drive shaft 3. This structure facilitates the rotation of the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 by rotating the first drive shaft 1, and also drives the rear half of the first drive shaft 1 and the second drive shaft 3 to rotate by rotating the first hydraulic wet clutch 2 or the second hydraulic wet clutch 4.

[0047] like Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10As shown, the first drive shaft 1 includes a front shaft 01 and a rear shaft 02 with a common central axis, and a gap is provided between the front shaft 01 and the rear shaft 02. The first drive shaft 1 is provided with a first gear 101, a first gear 102, a first gear 103, and a first gear 104 sequentially from front to back. The first gear 101 is mounted on the front shaft 01, and the first gear 102, first gear 103, and first gear 104 are mounted on the rear shaft 02. The first hydraulic wet clutch 2 has a second gear 104 mounted on its shaft from front to back. Gear 201, Gear 202, and Gear 203 are respectively engaged with Gear 101 and Gear 102. A first hydraulic wet clutch 2 controls the rotation of Gear 202 and Gear 203. Gear 203 is engaged with Gear 104. The second drive shaft 3 has Gear 301, Gear 302, Gear 303, and Gear 104 arranged from front to back. Gear 304, gear 303, and gear 304 are integrated gears; gear 104 meshes with gear 303; gear 401, gear 402, and gear 403 are sequentially arranged on the shaft of the second hydraulic wet clutch 4 from front to back. Gear 401 meshes with gear 101, gear 402 meshes with gear 103, and gear 403 meshes with gear 304. The two hydraulic wet clutches 4 are connected together, and the second hydraulic wet clutch 4 can control the rotation of the fourth gear 402 and the fourth gear 403. This structure facilitates the connection between the front shaft 01 of the first drive shaft 1 and the power output end of the generator. The rotation of the front shaft 01 can drive the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 to rotate, which in turn drives the rear shaft 02 and the second drive shaft 3 to rotate. Moreover, by controlling the rotation of the opposing gears through the first hydraulic real-time clutch and the second hydraulic wet clutch 4, power shifting can be achieved to achieve the purpose of rapid gear change.

[0048] like Figure 7 As shown, a first bearing seat 105 and a second bearing seat 106 are sequentially provided on the rear axle 02 of the first drive shaft 1 behind the first fourth gear 104. The first bearing seat 105 and the second bearing seat 106 are respectively connected to the second splicing shell 6 and the third splicing shell 7. A transmission joint 108 is provided at the front end of the front axle 01. The transmission joint 108 is used to connect to the power output end of the engine. A first oil seal seat 107 is provided on the front axle 01 behind the transmission joint 108. The first oil seal seat 107 is used to connect to the first splicing shell 5.

[0049] like Figure 8 and Figure 10As shown, the front ends of the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 are both provided with a second oil seal seat 204, and the main bodies of the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 are located inside the first assembly box.

[0050] like Figure 9 As shown, the second drive shaft 3 is provided with a coupling sleeve 307 on the third gear 302. The coupling sleeve 307 can be moved to the third gear 301. The third bearing seat 305 and the fourth bearing seat 306 are arranged in sequence behind the third gear 302. The third bearing seat 305 and the fourth bearing seat 306 are respectively connected to the second splicing shell 6 and the third splicing shell 7.

[0051] like Figure 12 As shown, the inner side of the first splicing shell 5 is provided with three mounting holes 51 for the shafts of the first drive shaft 1, the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 to pass through. The rear end of the first splicing shell 5 is provided with a connecting platform 52, and the connecting platform 52 is provided with multiple bolt holes 53. The connecting platform 52 and the connecting holes facilitate the connection between the first splicing shell 5 and the second splicing shell 6.

[0052] like Figure 13 As shown, the front end of the second splicing shell 6 is provided with a splicing joint 61. The splicing joint 61 is provided with a connecting groove 62 aligned with the bolt hole 53, which facilitates a stable connection between the first splicing shell 5 and the second splicing shell 6. The inner side of the second splicing shell 6 is provided with a support plate 63. The support plate 63 has through holes 64 along the vertical direction, which are used for the first drive shaft 1 and the second drive shaft 3 to pass through the second splicing shell 6. The support plate 63 also supports the first drive shaft 1 and the second drive shaft 3.

[0053] like Figure 14 As shown, the front edge of the third splicing shell 7 is provided with multiple fixing grooves 71 for connecting with the second splicing shell 6 by bolts. The front end of the third splicing shell 7 is provided with a through shaft hole 72 at the position aligned with the through hole 64, for the rear ends of the first drive shaft 1 and the second drive shaft 3 to pass into the interior of the third splicing shell 7 through the through shaft hole 72.

[0054] like Figure 3 and Figure 4 As shown, it also includes a shift paddle 8, which is sleeved on the first drive shaft 1, and the top of the shift paddle 8 is connected to the connecting sleeve 307, so that the connecting sleeve 307 can be slid by shifting the shift paddle 8.

[0055] like Figure 11As shown, the top of the shift paddle 8 has a latch 81, which engages with the engaging sleeve 307, facilitating the use of the shift paddle 8 and the engaging sleeve 307. The bottom of the shift paddle 8 has a sleeve hole 82, which fits onto the rear axle 02 of the first drive shaft 1, facilitating the use of the shift paddle 8 with the rear axle 02. The bottom of the shift paddle 8 has a lever 83, and the bottom end of the lever 83 has a connector 84.

[0056] Working Principle: This power shift transmission connects to a hydraulic system, an electronic control unit (ECU), and multiple solenoid valves. A hydraulic pump continuously operates to build up oil pressure, providing power to the system. When the vehicle needs to shift gears, the ECU sends commands to control the corresponding solenoid valves based on signals such as vehicle speed, engine speed, and accelerator pedal position. After the solenoid valves activate, they change the flow and pressure of the hydraulic oil, causing specific hydraulic wet clutches to engage or disengage. For example, when upshifting, the hydraulic wet clutch corresponding to the original gear gradually disengages after the hydraulic oil is depressurized, reducing power transmission. Simultaneously, the hydraulic wet clutch of the target gear gradually engages under the push of the hydraulic oil, and the new gear set enters its working state. By changing the gear ratio through different gear ratios, smooth power transmission and gear shifting are achieved. Downshifting follows a similar process, only the operation sequence is reversed. Throughout the gear shifting process, the alternating operation of different clutches ensures continuous power transmission, preventing power interruption and improving the smoothness and efficiency of gear shifting. Specifically, when the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 of this application are working, the hydraulic pump starts when the control system issues an engagement command, drawing hydraulic oil from the tank, filtering it, and then pressurizing it before delivering it to the clutch control oil circuit. The high-pressure oil enters the clutch piston chamber, pushing the piston against the return spring force, causing the friction plate assembly and steel plate assembly to press against each other. Power is transmitted through the friction between them, completing the engagement process. When disengagement is required, the control system opens the oil discharge channel, and the hydraulic oil in the piston chamber flows back to the tank under the action of the return spring. The piston returns to its original position, the friction plate assembly and steel plate assembly separate, and power transmission is interrupted. Its core working principle lies in using the pressure generated by the hydraulic oil to push the piston, controlling the pressing and disengaging states between the friction plates and steel plates, thereby achieving power engagement and disengagement. Simultaneously, the friction plates immersed in the oil can dissipate the heat generated by friction through oil circulation, ensuring stable and reliable clutch operation.

[0057] The power transmission process for the specific gears in this application is as follows:

[0058] Rear power output: Engine power → First gear 101 → Second gear 201 → Second gear 202 → First gear 102 → Rear axle 02 output.

[0059] Four-wheel drive (high and low reverse gears):

[0060] Engine power → First gear 101 → Second gear 201 → Second and third gears 203 → First and fourth gears 104 → Rear shaft 02 output → Third gear 303 → Third and fourth gears 304 → Second drive shaft 3 output.

[0061] Engine power → First gear 101 → Fourth gear 401 → Fourth gear 402 → First gear 103 → Rear shaft 02 output → Third gear 303 → Third gear 304 → Second drive shaft 3 output.

[0062] Engine power → First gear 101 → Fourth gear 401 → Fourth gear 403 → Third gear 303 / Third gear 304 → Second gear 203 → First gear 104 → Rear shaft 02 output → Third gear 303 → Third gear 304 → Second drive shaft 3 output.

[0063] High-end: Engine power → First gear 101 → Second gear 201 → Second and third gears 203 → First and fourth gears 104 → Rear axle 02 output.

[0064] Low gear: Engine power → First gear 101 → Fourth gear 401 → Fourth gear 402 → First gear 103 → Rear axle 02 output.

[0065] Reverse gear: Engine power → First gear 101 → Fourth gear 401 → Fourth gear 403 → Third gear 303 / Third gear 304 → Second gear 203 → First gear 104 → Rear axle 02 output.

[0066] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A power shift gearbox for an agricultural tractor chassis, comprising a first splicing housing (5), a second splicing housing (6), and a third splicing housing (7), characterized in that, The first splicing shell (5), the second splicing shell (6) and the third splicing shell (7) are connected in sequence to form the outer shell of the gearbox; the second splicing shell (6) is provided with a first drive shaft (1), a first hydraulic wet clutch (2), a second drive shaft (3) and a second hydraulic wet clutch (4); the front ends of the first drive shaft (1), the first hydraulic wet clutch (2), the second drive shaft (3) and the second hydraulic wet clutch (4) are connected to the first splicing shell (5), the rear ends of the first drive shaft (1) and the second drive shaft (3) are inserted into the third splicing shell (7), the second drive shaft (3) is located above the first drive shaft (1), and the first hydraulic wet clutch (2) and the second hydraulic wet clutch (4) are respectively located on both sides of the first drive shaft (1) and the second drive shaft (3).

2. The power shift gearbox for an agricultural tractor chassis according to claim 1, characterized in that, The first transmission shaft (1) includes a front shaft (01) and a rear shaft (02) with a common central axis. A gap is provided between the front shaft (01) and the rear shaft (02). The first transmission shaft (1) is provided with a first gear (101), a first gear (102), a first gear (103), and a first gear (104) in sequence from front to back. The first gear (101) is mounted on the front shaft (01). The first gear (102), the first gear (103), and the first gear (104) are mounted on the front shaft (01). The wheel (104) is mounted on the rear axle (02). The first hydraulic wet clutch (2) has a second gear (201), a second gear (202), and a second gear (203) arranged from front to back on its shaft. The second gear (201) and the second gear (202) mesh with the first gear (101) and the first gear (102) respectively. The first hydraulic wet clutch (2) can control the rotation of the second gear (202) and the second gear (203). The second and third gears (203) are meshed with the first and fourth gears (104); the second transmission shaft (3) is provided with a third first gear (301), a third second gear (302), a third third gear (303), and a third fourth gear (304) from front to back, wherein the third third gear (303) and the third fourth gear (304) are integrated gears; the first fourth gear (104) is meshed with the third third gear (303), and the shaft of the second hydraulic wet clutch (4) is connected from front to back. The gears are arranged in sequence as follows: the fourth gear (401), the fourth gear (402), and the fourth gear (403). The fourth gear (401) meshes with the first gear (101), the fourth gear (402) meshes with the first gear (103), and the fourth gear (403) meshes with the third gear (304). The second hydraulic wet clutch (4) can control the rotation of the fourth gear (402) and the fourth gear (403).

3. The power shift gearbox for an agricultural tractor chassis according to claim 2, characterized in that, The first drive shaft (1) has a first bearing seat (105) and a second bearing seat (106) arranged sequentially on the rear shaft (02) behind the first fourth gear (104). The first bearing seat (105) and the second bearing seat (106) are connected to the second splicing shell (6) and the third splicing shell (7) respectively. The front shaft (01) has a transmission joint (108) at the front end. The transmission joint (108) is used to connect to the power output end of the engine. The front shaft (01) has a first oil seal seat (107) arranged behind the transmission joint (108). The first oil seal seat (107) is used to connect to the first splicing shell (5).

4. The power shift gearbox for an agricultural tractor chassis according to claim 2, characterized in that, The first hydraulic wet clutch (2) and the second hydraulic wet clutch (4) are both provided with a second oil seal seat (204) at their front ends. The main bodies of the first hydraulic wet clutch (2) and the second hydraulic wet clutch (4) are located inside the first assembly box.

5. The power shift gearbox for an agricultural tractor chassis according to claim 2, characterized in that, The second drive shaft (3) is provided with a coupling sleeve (307) on the third gear (302). The coupling sleeve (307) can be moved to the third gear (301). The third bearing seat (305) and the fourth bearing seat (306) are arranged in sequence behind the third gear (302). The third bearing seat (305) and the fourth bearing seat (306) are respectively connected to the second splicing shell (6) and the third splicing shell (7).

6. The power shift gearbox for an agricultural tractor chassis according to claim 1, characterized in that, The first splicing shell (5) has three mounting holes (51) on its inner side for the shafts of the first drive shaft (1), the first hydraulic wet clutch (2) and the second hydraulic wet clutch (4) to pass through. The first splicing shell (5) has a connecting platform (52) at its rear end, and the connecting platform (52) has multiple bolt holes (53).

7. The power shift gearbox for an agricultural tractor chassis according to claim 6, characterized in that, The second splicing shell (6) has a splicing joint (61) at the front end. The splicing joint (61) has a connecting groove (62) aligned with the bolt hole (53). The second splicing shell (6) has a support plate (63) on the inner side. The support plate (63) has a through hole (64) along the vertical direction for the first drive shaft (1) and the second drive shaft (3) to pass through the second splicing shell (6). The support plate (63) supports the first drive shaft (1) and the second drive shaft (3).

8. The power shift gearbox for an agricultural tractor chassis according to claim 7, characterized in that, The third splicing shell (7) has multiple fixing grooves (71) at its front edge for connecting with the second splicing shell (6) by bolts. The third splicing shell (7) has a through hole (72) at the front end aligned with the through hole (64) for the rear ends of the first drive shaft (1) and the second drive shaft (3) to pass through the through hole (72) into the interior of the third splicing shell (7).

9. The power shift gearbox for an agricultural tractor chassis according to claim 5, characterized in that, It also includes a shift paddle (8), which is sleeved on the first drive shaft (1), and the top of the shift paddle (8) is connected to the engagement sleeve (307).

10. The power shift gearbox for an agricultural tractor chassis according to claim 9, characterized in that, The shift paddle (8) has a slot (81) at the top, which engages with the connecting sleeve (307). The shift paddle (8) has a sleeve hole (82) at the bottom, which is fitted onto the rear shaft (02) of the first drive shaft (1). The shift paddle (8) has a lever (83) at the bottom, and a connector (84) at the bottom end of the lever (83).

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