Power gear shifting transmission mechanism and gearbox of agricultural tractor chassis

Abstract

The invention discloses a power gear shifting transmission mechanism and a gearbox of an agricultural tractor chassis. The power gear shifting transmission mechanism comprises a first transmission shaft, a first hydraulic wet clutch, a second transmission shaft and a second hydraulic wet clutch. The first transmission shaft comprises a front shaft and a rear shaft, a first gear I, a first gear II, a first gear III and a first gear IV are sequentially arranged on the first transmission shaft from front to back, and the first gear I is arranged on the front shaft; a second first gear, a second second gear and a second third gear are arranged on a rotating shaft of the first hydraulic wet clutch from front to back, the second first gear and the second second gear are meshed with the first first gear and the first second gear respectively, and the second third gear is connected with the first fourth gear in a meshed mode. According to the invention, the first hydraulic wet clutch and the second hydraulic wet clutch are used for respectively controlling the gears above to rotate so as to control the speed change and gear shifting of the gearbox, so that the continuity of power output of the tractor is ensured, and the working efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gearboxes, in particular to a power shift transmission mechanism and a gearbox for an agricultural tractor chassis. Background Art

[0002] In modern agricultural production, agricultural tractors, as essential core power equipment, are responsible for diverse operations such as plowing, sowing, and harvesting. The transmission mechanism, the key hub for power transmission within the agricultural tractor chassis, directly impacts the tractor's operating efficiency, fuel economy, and operator comfort. Traditional agricultural tractors are often equipped with manual shift transmissions, requiring the driver to frequently depress the clutch pedal and manually shift the gear lever to change gears. In complex and ever-changing farmland environments, drivers must constantly monitor the operating conditions while frequently shifting gears. This significantly increases labor intensity, easily leading to fatigue, and compromises operational quality and safety. Furthermore, power interruptions during manual shifting result in discontinuous tractor power output, reducing operating efficiency and significantly impacting transmission components, shortening their service life.

[0003] The synchronizer shift transmission mechanism used in some tractors has optimized the shifting experience to a certain extent, but the synchronizer and gear still need to reach synchronous speed when shifting, which takes a long time and is difficult to meet the needs of efficient operations in modern agriculture. Moreover, after long-term use, the synchronizer is prone to wear, which makes shifting difficult, increases repair costs and maintenance workload. As modern agriculture moves towards intelligence and efficiency, higher requirements are placed on the shifting speed, power continuity and ease of operation of the transmission mechanism of agricultural tractors. The existing transmission mechanism of agricultural tractors can no longer meet these requirements. There is an urgent need for a power shift transmission mechanism and gearbox that can achieve fast, power-free shifting, simple operation and high reliability, so as to break through the technical bottleneck that restricts the performance and operating efficiency of agricultural tractors. Summary of the Invention

[0004] The purpose of the present invention is to provide a power shift transmission mechanism and a gearbox for an agricultural tractor chassis, aiming to improve the problems of power interruption and long shifting time during gear shifting of the existing agricultural tractor transmission mechanism, so as to improve the operating efficiency and operating comfort of the agricultural tractor.

[0005] The present invention is implemented as follows: According to one aspect of the present invention, the present invention provides a power shift transmission mechanism for an agricultural tractor chassis, comprising a first transmission shaft, a first hydraulic wet clutch, a second transmission shaft, and a second hydraulic wet clutch; the first transmission shaft comprises a front shaft and a rear shaft having a common central axis and a gap therebetween, the first transmission shaft is provided with a first gear, a first gear, a first gear, a first gear, a first gear, a first gear, a first gear and a first gear from front to back, wherein the first gear is arranged on the front shaft; the rotating shaft of the first hydraulic wet clutch is provided with a second gear, a second gear, and a second gear from front to back, the second gear The gear and the second gear are meshed with the first gear and the first gear, respectively, and the second gear is meshed and connected with the first gear; the second transmission shaft is provided with the third gear, the third gear, the third gear and the third gear from front to back, and the first gear is meshed and connected with the third gear; the rotating shaft of the second hydraulic wet clutch is provided with the fourth gear, the fourth gear and the fourth gear from front to back, respectively, and the fourth gear is meshed and connected with the first gear, the fourth gear is meshed and connected with the first gear, the fourth gear is meshed and connected with the first gear, and the fourth gear is meshed and connected with the third gear.

[0006] Furthermore, the second transmission shaft is arranged above the first transmission shaft, and the first hydraulic wet clutch and the second hydraulic wet clutch are respectively arranged on both sides of the first transmission shaft and the second transmission shaft; the central axes of the first transmission shaft, the second transmission shaft, the rotating shaft of the first hydraulic wet clutch and the rotating shaft of the second hydraulic wet clutch are parallel to each other, and the third gear and the third gear are integrated gears.

[0007] According to a second aspect of the present invention, there is provided a power shift transmission for an agricultural tractor chassis, comprising the power shift transmission mechanism of the agricultural tractor chassis; further comprising a first splicing shell, a second splicing shell and a third splicing shell, wherein the first splicing shell, the second splicing shell and the third splicing shell are sequentially connected to form a shell of the transmission; the first transmission shaft, the first hydraulic wet clutch, the second transmission shaft and the second hydraulic wet clutch are all disposed in the second splicing shell, and 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 to the first splicing shell, and the rear ends of the first transmission shaft and the second transmission shaft are inserted into the interior of the third splicing shell.

[0008] Furthermore, a first bearing seat and a second bearing seat are sequentially provided on the rear shaft of the first transmission shaft behind the first and fourth gears, and 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 shaft, and the transmission joint is used to be connected to the power output end of the engine, and a first oil seal seat is provided along the rear of the transmission joint on the front shaft, and the first oil seal seat is used to be connected to the first splicing shell.

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

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

[0011] Furthermore, three mounting holes are provided on the inner side of the first splicing shell for the first transmission shaft and the rotating shafts of the first hydraulic wet clutch and the second hydraulic wet clutch to pass through. A connecting platform is provided at the rear end of the first splicing shell, and a plurality of bolt holes are provided on the connecting platform.

[0012] Furthermore, a splicing joint is provided at the front end of the second splicing shell, and a connecting groove is provided at the position of the splicing joint aligned with the bolt hole. A supporting plate is provided on the inner side of the second splicing shell, and the supporting plate is provided with through holes in the up and down directions for the first transmission shaft and the second transmission shaft to pass through the second splicing shell, and the supporting plate supports the first transmission shaft and the second transmission shaft.

[0013] Furthermore, a plurality of fixing grooves are provided on the front end edge of the third splicing shell for being connected to the second splicing shell by bolts, and an axis-through hole is provided at the front end of the third splicing shell aligned with the perforation position for the rear ends of the first transmission shaft and the second transmission shaft to pass through the axis-through hole into the interior of the third splicing shell.

[0014] Furthermore, it also includes a shift paddle, which is mounted on the first transmission shaft, and the top of the shift paddle is connected to the coupling sleeve; the top of the shift paddle is provided with a bayonet, the bayonet is engaged with the coupling sleeve, and the bottom of the shift paddle is provided with a sleeve hole, the sleeve hole is mounted on the rear axle of the first transmission shaft, the bottom of the shift paddle is provided with a shift rod, and the bottom end of the shift rod is provided with a connecting head.

[0015] Compared with the prior art, the beneficial effects of the invention are:

[0016] 1. The present invention arranges a second transmission shaft above the first transmission shaft, and arranges a first hydraulic wet clutch and a second hydraulic wet clutch on both sides of the first transmission shaft and the second transmission shaft, respectively. The first hydraulic wet clutch and the second hydraulic wet clutch respectively control the rotation of the gear above them to control the speed shifting of the transmission. Moreover, this transmission does not require power interruption, thereby ensuring the continuity of the tractor's power output, effectively improving operating efficiency, and at the same time reducing the impact on the transmission system and extending the service life of the transmission components.

[0017] 2. The present invention adopts a wet multi-plate clutch structure through the first hydraulic wet clutch and the second hydraulic wet clutch, which has good performance, can adapt to the long-term and high-load working environment of agricultural tractors, improves the reliability and stability of the gearbox, and reduces repair costs and maintenance workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the power shift transmission provided by the present invention with the first spliced ​​shell opened;

[0019] Figure 2 It is a structural schematic diagram of the power shift transmission provided by the present invention;

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the power shift transmission mechanism provided by the present invention;

[0021] Figure 4 1 is a schematic structural diagram of the first transmission shaft, the second transmission shaft, the first hydraulic wet clutch, and the second hydraulic wet clutch of the present invention from a main perspective;

[0022] Figure 5 1 is a schematic structural diagram of the first transmission shaft, the second transmission shaft, the first hydraulic wet clutch, and the second hydraulic wet clutch in a top view of the present invention;

[0023] Figure 6 1 is a schematic structural diagram of the first transmission shaft, the second transmission shaft, the first hydraulic wet clutch, and the second hydraulic wet clutch of the present invention from a bottom-up perspective;

[0024] Figure 7 is a schematic structural diagram of the first transmission shaft of the present invention;

[0025] Figure 8 is a schematic structural diagram of a first hydraulic wet clutch of the present invention;

[0026] Figure 9 is a schematic structural diagram of the second transmission shaft of the present invention;

[0027] Figure 10is a schematic structural diagram of a second hydraulic wet clutch of the present invention;

[0028] Figure 11 is a schematic structural diagram of the shift paddle of the present invention;

[0029] Figure 12 is a schematic structural diagram of a first spliced ​​shell of the present invention;

[0030] Figure 13 is a schematic structural diagram of a second spliced ​​shell of the present invention;

[0031] Figure 14 It is a structural schematic diagram of the third spliced ​​shell of the present invention.

[0032] In the figure: 1. First transmission shaft; 01. Front axle; 02. Rear axle; 101. Gear No. 11; 102. Gear No. 12; 103. Gear No. 13; 104. Gear No. 14; 105. First bearing seat; 106. Second bearing seat; 107. First oil seal seat; 108. Transmission joint; 2. First hydraulic wet clutch; 201. Gear No. 21; 202. Gear No. 22; 203. Gear No. 23; 204. Second oil seal seat; 3. Second transmission shaft; 301. Gear No. 31; 302. Gear No. 32; 303. Gear No. 33; 304, gear number 3-4; 305, third bearing seat; 306, fourth bearing seat; 307, coupling sleeve; 4, second hydraulic wet clutch; 401, gear number 4-1; 402, gear number 4-2; 403, gear number 4-3; 5, first splicing shell; 51, mounting hole; 52, connecting platform; 53, bolt hole; 6, second splicing shell; 61, splicing joint; 62, connecting groove; 63, supporting 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 DESCRIPTION

[0033] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0034] The following is further explained in conjunction with the accompanying drawings and specific embodiments. The power shift transmission mechanism is part of the power shift transmission gearbox. The following embodiments reflect the specific structure and working mode of the power shift transmission mechanism through the overall description of the power shift transmission gearbox, and the power shift transmission mechanism will not be repeatedly described separately.

[0035] Example 1

[0036] like Figure 1 、 Figure 2 and Figure 3 As shown, this embodiment provides a power shift transmission for an agricultural tractor chassis, comprising 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 sequentially connected to form a transmission housing; this assembled housing structure facilitates the assembly of the various components of the entire transmission and also facilitates the protection of the various components. A first transmission shaft 1, a first hydraulic wet clutch 2, a second transmission shaft 3 and a second hydraulic wet clutch 4 are provided inside the second splicing shell 6; the front ends of the first transmission shaft 1, the first hydraulic wet clutch 2, the second transmission shaft 3 and the second hydraulic wet clutch 4 are connected to the first splicing shell 5, and the rear ends of the first transmission shaft 1 and the second transmission shaft 3 are inserted into the third splicing shell 7, the second transmission shaft 3 is arranged above the first transmission shaft 1, and the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 are respectively arranged on both sides of the first transmission shaft 1 and the second transmission shaft 3; this structure is convenient for driving the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 to rotate by the rotation of the first transmission shaft 1, and driving the rear half of the first transmission shaft 1 and the second transmission shaft 3 to rotate by the first hydraulic wet clutch 2 or the second hydraulic wet clutch 4.

[0037] like Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10As shown, the first transmission 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 transmission shaft 1 is provided with a first gear 101, a first gear 102, a first gear 103 and a first gear 104 from front to back. The first gear 101 is provided on the front shaft 01, the first gear 102, the first gear 103 and the first gear 104 are provided on the rear shaft 02, and the second gear 101 is provided on the rotating shaft of the first hydraulic wet clutch 2 from front to back. The second first gear 201, the second second gear 202 and the second third gear 203, the second first gear 201 and the second second gear 202 are respectively engaged with the first first gear 101 and the first second gear 102, the first hydraulic wet clutch 2 can control the rotation of the second second gear 202 and the second third gear 203, the second third gear 203 is engaged with the first fourth gear 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 104 from front to back. The gear 304, the third gear 303 and the third gear 304 are integrated gears; the first gear 104 is meshed with the third gear 303, and the shaft of the second hydraulic wet clutch 4 is provided with a fourth gear 401, a fourth gear 402 and a fourth gear 403 from front to back. The fourth gear 401 is meshed with the first gear 101, the fourth gear 402 is meshed with the first gear 103, and the fourth gear 403 is meshed with the third gear 304. The second hydraulic wet clutch 4 can control the rotation of the fourth second gear 402 and the fourth third gear 403; this structure facilitates the connection of the front axle 01 of the first transmission shaft 1 with the power output end of the generator. The rotation of the front axle 01 can drive the rotation of the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4, and then drive the rotation of the rear axle 02 and the second transmission shaft 3. 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 realized to achieve the purpose of fast gear shifting.

[0038] 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 transmission shaft 1 behind the first and fourth gears 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, and the transmission joint 108 is used to be connected to the power output end of the engine, and a first oil seal seat 107 is provided on the front axle 01 along the rear of the transmission joint 108, and the first oil seal seat 107 is used to be connected to the first splicing shell 5.

[0039] 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 arranged inside the first assembly box.

[0040] like Figure 9 As shown, an engagement sleeve 307 is provided along the second transmission shaft 3 between the third-first gear 301 and the third-second gear 302. This engagement sleeve 307 facilitates shifting with the shift mechanism. A third bearing block 305 and a fourth bearing block 306 are located behind the third-second gear 302. These bearing blocks 305 and 306 are connected to the second and third splicing shells 6 and 7, respectively, facilitating the installation and securement of the second transmission shaft 3.

[0041] like Figure 12 As shown, three mounting holes 51 are provided on the inner side of the first splicing shell 5 for the first transmission shaft 1 and the rotating shafts of the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 to pass through. A connecting platform 52 is provided at the rear end of the first splicing shell 5, and a plurality of bolt holes 53 are provided on the connecting platform 52. The connecting platform 52 and the connecting holes are for the convenience of connecting the first splicing shell 5 and the second splicing shell 6.

[0042] like Figure 13 As shown, a splicing joint 61 is provided at the front end of the second splicing shell 6. A connecting groove 62 is provided on the splicing joint 61 aligned with the bolt hole 53 to facilitate the stable connection between the first splicing shell 5 and the second splicing shell 6. A supporting plate 63 is provided on the inside of the second splicing shell 6. The supporting plate 63 has through-holes 64 in the vertical direction for the first and second transmission shafts 1 and 3 to pass through the second splicing shell 6. The supporting plate 63 also supports the first and second transmission shafts 1 and 3.

[0043] like Figure 14 As shown, a plurality of fixing grooves 71 are provided on the front end edge of the third splicing shell 7 for being connected to the second splicing shell 6 by bolts, and an axis hole 72 is provided at the front end of the third splicing shell 7 aligned with the position of the through hole 64 for the rear ends of the first transmission shaft 1 and the second transmission shaft 3 to pass through the interior of the third splicing shell 7 from the axis hole 72.

[0044] Example 2

[0045] like Figure 1 、 Figure 2 and Figure 3As shown, this embodiment provides a power shift transmission for an agricultural tractor chassis, comprising 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 sequentially connected to form a transmission housing; this assembled housing structure facilitates the assembly of the various components of the entire transmission and also facilitates the protection of the various components. A first transmission shaft 1, a first hydraulic wet clutch 2, a second transmission shaft 3 and a second hydraulic wet clutch 4 are provided inside the second splicing shell 6; the front ends of the first transmission shaft 1, the first hydraulic wet clutch 2, the second transmission shaft 3 and the second hydraulic wet clutch 4 are connected to the first splicing shell 5, and the rear ends of the first transmission shaft 1 and the second transmission shaft 3 are inserted into the third splicing shell 7, the second transmission shaft 3 is arranged above the first transmission shaft 1, and the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 are respectively arranged on both sides of the first transmission shaft 1 and the second transmission shaft 3; this structure is convenient for driving the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 to rotate by the rotation of the first transmission shaft 1, and driving the rear half of the first transmission shaft 1 and the second transmission shaft 3 to rotate by the first hydraulic wet clutch 2 or the second hydraulic wet clutch 4.

[0046] like Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 and Figure 10As shown, the first transmission 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 transmission shaft 1 is provided with a first gear 101, a first gear 102, a first gear 103 and a first gear 104 from front to back. The first gear 101 is provided on the front shaft 01, the first gear 102, the first gear 103 and the first gear 104 are provided on the rear shaft 02, and the second gear 101 is provided on the rotating shaft of the first hydraulic wet clutch 2 from front to back. The second first gear 201, the second second gear 202 and the second third gear 203, the second first gear 201 and the second second gear 202 are respectively engaged with the first first gear 101 and the first second gear 102, the first hydraulic wet clutch 2 can control the rotation of the second second gear 202 and the second third gear 203, the second third gear 203 is engaged with the first fourth gear 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 104 from front to back. The gear 304, the third gear 303 and the third gear 304 are integrated gears; the first gear 104 is meshed with the third gear 303, and the shaft of the second hydraulic wet clutch 4 is provided with a fourth gear 401, a fourth gear 402 and a fourth gear 403 from front to back. The fourth gear 401 is meshed with the first gear 101, the fourth gear 402 is meshed with the first gear 103, and the fourth gear 403 is meshed with the third gear 304. The second hydraulic wet clutch 4 can control the rotation of the fourth second gear 402 and the fourth third gear 403; this structure facilitates the connection of the front axle 01 of the first transmission shaft 1 with the power output end of the generator. The rotation of the front axle 01 can drive the rotation of the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4, and then drive the rotation of the rear axle 02 and the second transmission shaft 3. 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 realized to achieve the purpose of fast gear shifting.

[0047] 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 transmission shaft 1 behind the first and fourth gears 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, and the transmission joint 108 is used to be connected to the power output end of the engine, and a first oil seal seat 107 is provided on the front axle 01 along the rear of the transmission joint 108, and the first oil seal seat 107 is used to be connected to the first splicing shell 5.

[0048] 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 arranged inside the first assembly box.

[0049] like Figure 9 As shown, the second transmission shaft 3 is provided with a coupling sleeve 307 on the third-second gear 302, and the coupling sleeve 307 can be moved to the third-first gear 301. A third bearing seat 305 and a fourth bearing seat 306 are provided behind the third-second gear 302 in sequence. 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.

[0050] like Figure 12 As shown, three mounting holes 51 are provided on the inner side of the first splicing shell 5 for the first transmission shaft 1 and the rotating shafts of the first hydraulic wet clutch 2 and the second hydraulic wet clutch 4 to pass through. A connecting platform 52 is provided at the rear end of the first splicing shell 5, and a plurality of bolt holes 53 are provided on the connecting platform 52. The connecting platform 52 and the connecting holes are for the convenience of connecting the first splicing shell 5 and the second splicing shell 6.

[0051] like Figure 13 As shown, a splicing joint 61 is provided at the front end of the second splicing shell 6. A connecting groove 62 is provided on the splicing joint 61 aligned with the bolt hole 53 to facilitate the stable connection between the first splicing shell 5 and the second splicing shell 6. A supporting plate 63 is provided on the inside of the second splicing shell 6. The supporting plate 63 has through-holes 64 in the vertical direction for the first and second transmission shafts 1 and 3 to pass through the second splicing shell 6. The supporting plate 63 also supports the first and second transmission shafts 1 and 3.

[0052] like Figure 14 As shown, a plurality of fixing grooves 71 are provided on the front end edge of the third splicing shell 7 for being connected to the second splicing shell 6 by bolts, and an axis hole 72 is provided at the front end of the third splicing shell 7 aligned with the position of the through hole 64 for the rear ends of the first transmission shaft 1 and the second transmission shaft 3 to pass through the interior of the third splicing shell 7 from the axis hole 72.

[0053] like Figure 3 and Figure 4 As shown, it also includes a shift paddle 8, which is sleeved on the first transmission shaft 1, and the top of the shift paddle 8 is connected to the coupling sleeve 307, so that the shift paddle 8 can be used to slide the coupling sleeve 307.

[0054] like Figure 11As shown, the top of the shift paddle 8 is provided with a bayonet 81, which engages with the coupling sleeve 307, facilitating the use of the shift paddle 8 and the coupling sleeve 307. Furthermore, the bottom of the shift paddle 8 is provided with a sleeve hole 82, which is sleeved onto the rear axle 02 of the first transmission shaft 1, facilitating the use of the shift paddle 8 with the rear axle 02. The bottom of the shift paddle 8 is provided with a lever 83, and the bottom end of the lever 83 is provided with a connector 84.

[0055] Working Principle: Operation of this powershift transmission requires connections between a hydraulic system, an electronic control unit, and multiple solenoid valves. The hydraulic pump continuously operates to build up oil pressure, providing the system with a power source. When the vehicle needs to shift gears, the electronic control unit (ECU) issues commands to control the corresponding solenoid valves based on signals such as vehicle speed, engine speed, and accelerator pedal position. Actuation of the solenoid valves changes the flow and pressure of the hydraulic oil, causing a specific hydraulic wet clutch to engage or disengage. For example, when shifting up, the hydraulic wet clutch corresponding to the original gear gradually disengages after the hydraulic oil pressure is released, reducing power transmission. Simultaneously, the hydraulic wet clutch of the target gear gradually engages under the pressure of the hydraulic oil, and the new gear set enters operation. The gear ratio is changed by the gear ratio, achieving smooth power transmission and gear shifting. Downshifting follows a similar process, except the order of operations is reversed. Throughout the shifting process, the alternating operation of the various clutches ensures consistent power transmission, avoiding power interruptions and improving shifting smoothness and efficiency. Specifically, when the control system issues an engagement command for the first and second hydraulic wet clutches 2 and 4, the hydraulic pump activates, drawing hydraulic oil from the reservoir. After filtering through the filter, it is pressurized and delivered to the clutch control oil circuit. The high-pressure oil enters the clutch piston chamber, pushing the piston against the return spring force, compressing the friction plate pack and the steel plate pack. The friction between the two forces transmits power, completing the engagement process. When disengagement is required, the control system opens the oil discharge channel, allowing the hydraulic oil in the piston chamber to flow back to the reservoir under the action of the return spring. The piston resets, separating the friction plate pack and the steel plate pack, and interrupting power transmission. The core operating principle is to utilize the pressure generated by the hydraulic oil to push the piston, controlling the compression and separation between the friction plate and steel plate, thereby achieving power engagement and disconnection. Simultaneously, the friction plates immersed in the oil circulate and remove heat generated by friction, ensuring stable and reliable clutch operation.

[0056] The power transmission process for the specific gear in this application is as follows:

[0057] Rear power output: engine power → first gear 101 → second gear 201 → second gear 202 → first gear 102 → rear axle 02 output.

[0058] Four-wheel drive (high, low and reverse gear):

[0059] Engine power → first gear 101 → second gear 201 → second gear 203 → first gear 104 → rear axle 02 output → third gear 303 → third gear 304 → second transmission shaft 3 output.

[0060] Engine power → first gear 101 → fourth gear 401 → fourth gear 402 → first gear 103 → rear axle 02 output → third gear 303 → third gear 304 → second transmission shaft 3 output.

[0061] Engine power → 1st gear 101 → 4th gear 401 → 4th gear 403 → 3rd gear 303 / 3rd gear 304 → 2nd gear 203 → 1st gear 104 → rear axle 02 output → 3rd gear 303 → 3rd gear 304 → 2nd transmission shaft 3 output.

[0062] High gear: engine power → first gear 101 → second gear 201 → second gear 203 → first gear 104 → rear axle 02 output.

[0063] Bottom gear: engine power → first gear 101 → fourth gear 401 → fourth gear 402 → first gear 103 → rear axle 02 output.

[0064] Reverse gear: engine power → 1st gear 101 → 4th gear 401 → 4th gear 403 → 3rd gear 303 / 3rd gear 304 → 2nd gear 203 → 1st gear 104 → rear axle 02 output.

[0065] The above is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A power shift transmission mechanism for an agricultural tractor chassis, characterized in that: The invention comprises a first transmission shaft (1), a first hydraulic wet clutch (2), a second transmission shaft (3) and a second hydraulic wet clutch (4); the first transmission shaft (1) comprises a front shaft (01) and a rear shaft (02) having a common central axis and a gap, the first transmission shaft (1) is provided with a first number one gear (101), a first number two gear (102), a first number three gear (103) and a first number four gear (104) in sequence from front to back, wherein the first number one gear (101) is arranged on the front shaft (01); the rotating shaft of the first hydraulic wet clutch (2) is provided with a second number one gear (201), a second number two gear (202) and a second number three gear (203) in sequence from front to back, the second number one gear (201) and the second number two gear (202) are respectively connected to the first number one gear (101) and the first number two gear (1 02), the second gear (203) is meshed and connected with the first gear (104); the second transmission shaft (3) is provided with a third gear (301), a third gear (302), a third gear (303) and a third gear (304) from front to back, the first gear (104) is meshed and connected with the third gear (303), and the rotating shaft of the second hydraulic wet clutch (4) is provided with a fourth gear (401), a fourth gear (402) and a fourth gear (403) from front to back, the fourth gear (401) is meshed and connected with the first gear (101), the fourth gear (402) is meshed and connected with the first gear (103), and the fourth gear (403) is meshed and connected with the third gear (304).

2. The power shift transmission mechanism of an agricultural tractor chassis according to claim 1, characterized in that: The second transmission shaft (3) is arranged above the first transmission shaft (1), and the first hydraulic wet clutch (2) and the second hydraulic wet clutch (4) are respectively arranged on both sides of the first transmission shaft (1) and the second transmission shaft (3); the central axes of the first transmission shaft (1), the second transmission shaft (3), the rotating shaft of the first hydraulic wet clutch (2) and the rotating shaft of the second hydraulic wet clutch (4) are parallel to each other, and the third gear (303) and the third gear (304) are integrated gears.

3. A power shift gearbox for an agricultural tractor chassis, characterized in that: A power shift transmission mechanism having an agricultural tractor chassis according to claim 2; further comprising a first splicing shell (5), a second splicing shell (6) and a third splicing shell (7), wherein the first splicing shell (5), the second splicing shell (6) and the third splicing shell (7) are sequentially connected to form a housing of a gearbox; the first transmission shaft (1), the first hydraulic wet clutch (2), the second transmission shaft (3) and the second hydraulic wet clutch (4) are all arranged in the second splicing shell (6), and the front ends of the first transmission shaft (1), the first hydraulic wet clutch (2), the second transmission shaft (3) and the second hydraulic wet clutch (4) are connected to the first splicing shell (5), and the rear ends of the first transmission shaft (1) and the second transmission shaft (3) are inserted into the interior of the third splicing shell (7).

4. The power shift transmission for an agricultural tractor chassis according to claim 3, characterized in that: A first bearing seat (105) and a second bearing seat (106) are sequentially provided on the rear shaft (02) of the first transmission shaft (1) behind the first and fourth gears (104), and 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 shaft (01), and the transmission joint (108) is used to be connected to the power output end of the engine, and a first oil seal seat (107) is provided on the front shaft (01) behind the transmission joint (108), and the first oil seal seat (107) is used to be connected to the first splicing shell (5).

5. The power shift transmission for an agricultural tractor chassis according to claim 3, characterized in that: A second oil seal seat (204) is provided at the front end of each of the first hydraulic wet clutch (2) and the second hydraulic wet clutch (4), and the main bodies of the first hydraulic wet clutch (2) and the second hydraulic wet clutch (4) are arranged inside the first assembly box.

6. The power shift transmission for an agricultural tractor chassis according to claim 3, characterized in that: The second transmission shaft (3) is provided with an engagement sleeve (307) on the third second gear (302), and the engagement sleeve (307) can be moved onto the third first gear (301). A third bearing seat (305) and a fourth bearing seat (306) are provided in sequence behind the third second gear (302), and 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).

7. The power shift transmission for an agricultural tractor chassis according to claim 3, characterized in that: The first splicing shell (5) is provided with three mounting holes (51) on its inner side for the first transmission shaft (1), the first hydraulic wet clutch (2), and the rotating shaft of the second hydraulic wet clutch (4) to pass through. The first splicing shell (5) is provided with a connecting platform (52) at the rear end, and a plurality of bolt holes (53) are provided on the connecting platform (52).

8. The power shift transmission for an agricultural tractor chassis according to claim 7, characterized in that: A splicing joint (61) is provided at the front end of the second splicing shell (6), and a connecting groove (62) is provided at a position aligned with the bolt hole (53). A supporting plate (63) is provided on the inner side of the second splicing shell (6), and the supporting plate (63) is provided with a through hole (64) in the up-down direction for the first transmission shaft (1) and the second transmission shaft (3) to pass through the second splicing shell (6), and the supporting plate (63) plays a supporting role for the first transmission shaft (1) and the second transmission shaft (3).

9. The power shift transmission for an agricultural tractor chassis according to claim 8, characterized in that: The front edge of the third splicing shell (7) is provided with a plurality of fixing grooves (71) for connecting with the second splicing shell (6) by bolts. The front end of the third splicing shell (7) is aligned with the position of the through hole (64) and is provided with a through-axis hole (72) for the rear ends of the first transmission shaft (1) and the second transmission shaft (3) to pass through the through-axis hole (72) into the interior of the third splicing shell (7).

10. The power shift transmission for an agricultural tractor chassis according to claim 6, characterized in that: The invention also includes a shift paddle (8), wherein the shift paddle (8) is sleeved on the first transmission shaft (1), and the top of the shift paddle (8) is connected to the coupling sleeve (307); the top of the shift paddle (8) is provided with a bayonet (81), the bayonet (81) is engaged with the coupling sleeve (307), and the bottom of the shift paddle (8) is provided with a sleeve hole (82), the sleeve hole (82) is sleeved on the rear axle (02) of the first transmission shaft (1), the bottom of the shift paddle (8) is provided with a shift rod (83), and the bottom end of the shift rod (83) is provided with a connector (84).

Images