Transmission system and working machine

Abstract

The application relates to the technical field of transmission systems, and discloses a transmission system and a working machine. The transmission system comprises a gearbox, a power output box and a transfer box, the gearbox is internally provided with a first input shaft, a transmission assembly and a first output shaft, the first input shaft is in transmission connection with the first output shaft through the transmission assembly, and the transmission assembly establishes at least two transmission paths between the first input shaft and the first output shaft; the power output box is internally provided with a second input shaft, a second output shaft and an output clutch, the second input shaft is connected with the first input shaft, and the output clutch is arranged between the second input shaft and the second output shaft; the transfer box is internally provided with a third input shaft and a third output shaft, the third input shaft is connected with the second output shaft, and the third output shaft is in transmission connection with the third input shaft. The transmission system disclosed by the application can adjust the output rotating speeds of the first output shaft and the third output shaft respectively, realizes decoupling, and is beneficial to improving the flexibility of the transmission system.

Description

Technical Field

[0001] This invention relates to the field of transmission system technology, and more specifically to a transmission system and a working machine. Background Technology

[0002] In agricultural and construction machinery applications, the transmission system is the core component for power distribution and operational functions. The gearbox is the device within the transmission system used to regulate output speed and torque, while the PTO (Power Take-Off) is used to transmit power to external actuators, driving their independent operation.

[0003] In existing transmission systems, the PTO is usually integrated into the gearbox. The power of the drive unit is split through the internal path of the gearbox and then transmitted to the running gear and the PTO respectively.

[0004] However, the above-mentioned integrated solution causes the output speed of the PTO to be limited by the transmission ratio of the transmission path in the gearbox, which creates an unnecessary correlation with the walking state of the working machinery, making it difficult to control independently and resulting in poor flexibility. Summary of the Invention

[0005] This invention provides a transmission system and working machinery to solve the problem in the prior art where the PTO and gearbox are integrated, making independent control difficult and resulting in poor flexibility.

[0006] In a first aspect, the present invention provides a transmission system for a working machine, comprising: a gearbox, wherein the gearbox has a first input shaft, a transmission assembly, and a first output shaft, one end of the first input shaft is used to connect to a drive device of the working machine, the first input shaft and the first output shaft are connected via the transmission assembly, the transmission assembly is configured to establish at least two transmission paths between the first input shaft and the first output shaft, and control one of the at least two transmission paths to be connected, wherein the transmission ratios of the transmission paths are different, and the first output shaft is used to connect to a traveling mechanism of the working machine; a power output box, wherein the power output box has a second input shaft, a second output shaft, and an output clutch, one end of the second input shaft is connected to the other end of the first input shaft, and the output clutch is disposed between the other end of the second input shaft and one end of the second output shaft to control the engagement or disengagement of the second output shaft from the second input shaft; and a transfer case, wherein the transfer case has a third input shaft and a third output shaft, one end of the third input shaft is connected to the other end of the second output shaft, the third output shaft is connected to the third input shaft, and the third output shaft is used to connect to an actuator of the working machine.

[0007] Based on the aforementioned technical means, this application independently sets up the gearbox, power output box, and transfer case. The gearbox is used to connect with the traveling mechanism to drive the working machinery, and achieves gear switching by connecting different power transmission paths. The power output box is connected to the first input shaft, directly receiving the power from the drive device, and the engagement and disengagement of the power output box are independently controlled by the output clutch. Therefore, the rotational speed output by the second output shaft of the power output box does not need to be transmitted through the transmission components within the gearbox, thus eliminating the rigid constraint of the transmission ratio on the transmission path, achieving independent control of the power output box, and decoupling it from the traveling state.

[0008] Furthermore, the transfer case is the final actuator, distributing the power output from the power take-off box to the various actuators of the working machinery. The transmission relationship between its third input shaft and third output shaft can be flexibly configured according to the needs of the working machinery. Therefore, the final output speed of the third output shaft depends only on the operating conditions of the drive unit and the transmission relationship within the transfer case, while the output speed of the first output shaft of the gearbox depends only on the specific conditions of the transmission path within the gearbox. Thus, the operating state of the actuators can be independently controlled at different driving gears of the working machinery, which helps improve the flexibility and adaptability of the working machinery in complex operating scenarios.

[0009] In one optional embodiment, the transmission assembly includes a first clutch, a second clutch, a third clutch, and a fourth clutch; the at least two transmission paths include a first transmission path, a second transmission path, a third transmission path, and a fourth transmission path; when the first clutch is engaged and the second, third, and fourth clutches are all disengaged, the power of the first input shaft is transmitted to the first output shaft through the first transmission path; when the second clutch is engaged and the first, third, and fourth clutches are all disengaged, the power of the first input shaft is transmitted to the first output shaft through the second transmission path; when the third clutch is engaged and the first, second, and fourth clutches are all disengaged, the power of the first input shaft is transmitted to the first output shaft through the third transmission path; when the fourth clutch is engaged and the first, second, and third clutches are all disengaged, the power of the first input shaft is transmitted to the first output shaft through the fourth transmission path.

[0010] Thus, the first, second, third, and fourth clutches are all connected to the control system of the working machinery. The control system switches the transmission path by controlling the engagement or disengagement of the first, second, third, and fourth clutches, thereby achieving full-power gear shifting without power interruption during gear shifting. In conjunction with the adjustment of the drive unit speed, it can achieve smooth and rapid speed adjustment of the walking mechanism, which is simple to operate and highly flexible.

[0011] In one optional embodiment, the transmission assembly includes a first transmission shaft, a first transmission gear, and a second transmission gear; the first transmission gear is drivenly connected to the first input shaft; the first transmission gear is fixedly connected to the first transmission shaft, the second transmission gear is rotatably sleeved on the first transmission shaft, and the second transmission gear is drivenly connected to the first output shaft; a first clutch is disposed on the first transmission shaft and located between the first transmission gear and the second transmission gear to control the engagement or disengagement of the first transmission gear and the second transmission gear; when the first clutch is engaged, and the second clutch, the third clutch, and the fourth clutch are all disengaged, the first transmission gear drives the second transmission gear to rotate through the first clutch, thereby establishing the first transmission path between the first input shaft and the first output shaft.

[0012] Thus, when the first clutch engages, the second transmission gear rotates synchronously with the first transmission gear, connecting the first transmission path. Power from the first input shaft is transmitted sequentially through the first transmission gear, the first clutch, and the second transmission gear to the first output gear. When the first clutch disengages, the first and second transmission gears separate. While the first transmission gear rotates, the second transmission gear remains stationary. The first transmission shaft and the second transmission gear do not interfere with each other, and the first transmission path is cut off. Therefore, both the first and second transmission gears are fixed-axis gears. Compared to planetary gear sets in related technologies, the fixed-axis gears in this embodiment require lower machining precision, which helps save on the manufacturing and maintenance costs of the gearbox. Furthermore, when the first clutch disengages, the first and second transmission gears operate independently and do not interfere with each other. Therefore, rapid switching between other transmission paths in the first transmission path box can be achieved without power interruption, improving the transmission efficiency of the transmission system.

[0013] In one optional embodiment, the transmission assembly further includes a second transmission shaft, a third transmission gear, and a fourth transmission gear; the third transmission gear is fixedly connected to the second transmission shaft, and the fourth transmission gear is rotatably sleeved on the second transmission shaft; the third transmission gear meshes with the first transmission gear, the fourth transmission gear meshes with the second transmission gear, and the fourth transmission gear is drively connected to the first output shaft; a second clutch is disposed on the second transmission shaft and located between the third transmission gear and the fourth transmission gear to control the engagement or disengagement of the third transmission gear and the fourth transmission gear; when the second clutch is engaged, and the first clutch, the third clutch, and the fourth clutch are all disengaged, the third transmission gear drives the fourth transmission gear to rotate through the second clutch, thereby establishing a second transmission path between the first input shaft and the first output shaft.

[0014] Thus, when the second clutch engages, the third and fourth transmission gears connect, causing them to rotate synchronously. At this time, the first clutch disengages, and the first and second transmission gears separate, thus connecting the second transmission path. The power on the first input shaft sequentially passes through the first, third, first clutches, and fourth transmission gears to reach the first output shaft. When the second clutch disengages, the third and fourth transmission gears separate, and the second transmission path is interrupted. Furthermore, since the second and fourth transmission gears mesh, in the first transmission path, after power is transmitted to the second transmission gear, it continues to be transmitted to the first output shaft through the fourth transmission gear. It can be seen that both the first and second transmission paths require the fourth transmission gear to transmit power. The first and second transmission paths share some structural elements, which helps optimize the spatial layout within the gearbox, simplifies the internal structure, improves structural compactness, and thus saves manufacturing costs and reduces the size of the gearbox.

[0015] In one optional embodiment, the transmission assembly further includes a third transmission shaft, a fifth transmission gear, and a sixth transmission gear; the fifth transmission gear is fixedly connected to the second transmission shaft, and the sixth transmission gear is rotatably mounted on the third transmission shaft; the fifth transmission gear meshes with the sixth transmission gear, and the third transmission shaft is drively connected to the first output shaft; a third clutch is disposed on the third transmission shaft to control the engagement or disengagement of the sixth transmission gear from the third transmission shaft; when the third clutch is engaged, and the first clutch, second clutch, and fourth clutch are all disengaged, the sixth transmission gear drives the third transmission shaft to rotate through the third clutch, thereby establishing the third transmission path between the first input shaft and the first output shaft.

[0016] Thus, when the third clutch engages, the sixth transmission gear connects to the third transmission shaft, thereby driving the third transmission shaft to rotate synchronously. The third transmission path is then connected, and the power from the first input shaft sequentially passes through the first transmission gear, the third transmission gear, the second transmission shaft, the fifth transmission gear, the sixth transmission gear, and the third transmission shaft before finally reaching the first output shaft. When the third clutch disengages, the sixth transmission gear separates from the third transmission shaft, rotating only relative to the third transmission shaft, thus cutting off the third transmission path. Therefore, the third transmission path shares the first and third transmission gears with the second transmission path, which helps to further reduce the number of parts within the gearbox, optimize the structural layout of the gearbox, and save on manufacturing costs and space.

[0017] In one optional embodiment, the transmission assembly further includes a seventh transmission gear; the seventh transmission gear is rotatably mounted on the third transmission shaft, and the fourth transmission gear meshes with the third transmission gear; the fourth clutch is disposed on the third transmission shaft to control the engagement or disengagement of the seventh transmission gear from the third transmission shaft; when the fourth clutch is engaged, the seventh transmission gear drives the third transmission shaft to rotate through the fourth clutch to establish the fourth transmission path between the first input shaft and the first output shaft.

[0018] Thus, when the fourth clutch engages, the seventh transmission gear engages with the third transmission shaft, causing the third transmission shaft to rotate synchronously. The fourth transmission path is then connected, and the power on the first input shaft is transmitted sequentially through the first transmission gear, the third transmission gear, the seventh transmission gear, and the third transmission shaft to the first output shaft. When the fourth clutch disengages, the seventh transmission gear separates from the third transmission shaft and idles relative to it, cutting off the fourth transmission path. Therefore, the fourth transmission path shares the first transmission gear, the third transmission gear, and the third transmission shaft with the third transmission path, further reducing the number of parts, which helps lower the transmission failure rate, saves maintenance costs, and improves the reliability of the transmission system.

[0019] In one optional embodiment, the transmission assembly further includes an eighth transmission gear and a ninth transmission gear; a first driving gear is provided on the first input shaft, and a first driven gear is provided on the first output shaft; the eighth transmission gear is rotatably sleeved on the second transmission shaft, and the eighth transmission gear is fixedly connected to the fourth transmission gear; the ninth transmission gear is fixedly connected to the third transmission shaft, and the eighth transmission gear meshes with the ninth transmission gear, and the ninth transmission gear is drivingly connected to the first output shaft; the first driving gear meshes with the first transmission gear, and the first driven gear meshes with the ninth transmission gear.

[0020] Thus, the first, second, third, and fourth transmission paths all begin with the first transmission gear and converge at the ninth transmission gear. Therefore, only one driving gear is needed on the first input shaft, and correspondingly, only one driven gear is needed on the first output shaft. This reduces the number of gears and bearing span on the first input and output shafts, thereby increasing the critical speed of the first output shaft and the shaft system stiffness. Furthermore, the highly integrated internal structure of the gearbox simplifies the design of the lubrication circuits in the transmission system, reducing maintenance costs.

[0021] Furthermore, the meshing relationship of all gears within the transmission remains constant, simplifying gear shifting to a change in the state of each clutch rather than a change in gear meshing position. This eliminates the power interruption caused by changes in gear meshing position during gear shifts, as is common in related technologies. Simultaneously, the first transmission gear serves as a unified input port for all transmission paths, and the ninth transmission gear as a unified output port. This improves the stability of power distribution and merging during gear shifting, specifically during the overlapping engagement of the two clutches, preventing interference between transmission paths and enhancing the reliability of gear shifting within the transmission.

[0022] In one optional embodiment, a lock-up clutch is further included, wherein a fixed portion is provided within the gearbox; the lock-up clutch includes a driving portion and a driven portion that are rotatable relative to each other, the driving portion being connected to the first output shaft and the driven portion being connected to the fixed portion; when the lock-up clutch is engaged, the driving portion and the driven portion are locked to lock the first output shaft.

[0023] When the operating machinery requires parking braking, the drive unit stops outputting power, but the first output shaft will continue to rotate due to inertia. Therefore, a lock-up clutch is necessary. By controlling the engagement of the lock-up clutch, a rigid friction lock is formed between the driving and driven parts, thereby achieving the function of auxiliary braking. This helps improve the braking efficiency, safety, and reliability of the operating machinery. Furthermore, the lock-up clutch prevents ground adhesion from dragging the first output shaft to rotate in the opposite direction through the tires, thus avoiding alternating cyclic loads on the transmission components, reducing wear inside the transmission case, and extending the service life of the transmission case.

[0024] In one optional embodiment, the transfer case is further provided with at least one fourth drive shaft; the fourth drive shaft is provided with a tenth drive gear, the third input shaft is provided with a second drive gear, and the third output shaft is provided with a second driven gear; the tenth drive gear is connected to both the second drive gear and the second driven gear.

[0025] Thus, when the output clutch is engaged, the first input shaft drives the second input shaft to rotate, the second input shaft drives the second output shaft to rotate through the output clutch, the second output shaft drives the third input shaft to rotate, the second driving gear rotates synchronously with the third input shaft, and drives the second driven gear to rotate through the tenth transmission gear, the second driven gear drives the third output shaft to rotate, thereby driving the actuator of the working machine to operate.

[0026] Secondly, the present invention also provides a working machine, including the transmission system described in any one of the first aspects.

[0027] Based on the aforementioned technical means, by setting up the aforementioned transmission system, on the one hand, it is possible to deconstruct the gearbox and transfer case, realize independent control of the traveling mechanism and the actuator of the working machinery, improve the flexibility of the working machinery and its adaptability to complex working conditions, and on the other hand, the control system of the working machinery can control the engagement or disengagement of the first clutch, the second clutch, the third clutch and the fourth clutch, realize the rapid switching of the transmission path and complete the gear shift without power interruption, which is conducive to improving the accuracy of the working machinery operation. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a transmission route diagram of the transmission system according to an embodiment of the present invention; Figure 2 for Figure 1 Transmission route diagram inside the gearbox.

[0030] Explanation of reference numerals in the attached figures: 100 - Gearbox; 110 - First input shaft; 111 - First drive gear; 120 - Transmission assembly; 121 - First drive shaft; 1211 - First clutch; 1212 - First transmission gear; 1213 - Second transmission gear; 122 - Second drive shaft; 1221 - Second clutch; 1222 - Third transmission gear; 1223 - Fourth transmission gear; 1224 - Fifth transmission gear; 1225 - Eighth transmission gear; 123 - Third drive shaft; 1231 - Third clutch; 1232 - Fourth clutch; 1233 - Sixth transmission gear; 1234 - Seventh transmission gear; 1235 - Ninth transmission gear; 130 - First output shaft; 131 - First driven gear; 140 - Lock-up clutch; 200 - Power take-off box; 210 - Second input shaft; 220 - Second output shaft; 230 - Output clutch; 300 - Transfer case; 310 - Third input shaft; 311 - Second drive gear; 320 - Third output shaft; 321 - Second driven gear; 330 - Fourth drive shaft; 331 - Tenth drive gear; 340 - Lubrication pump; 400 - First connecting shaft; 500 - Second connecting shaft; 10-Drive device. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] As demonstrated in the background section, in related technologies, the PTO is typically integrated within the gearbox. The power from the drive unit is split within the gearbox and then transmitted to the traveling mechanism and the PTO respectively. However, the output speed resulting from this integrated solution is limited by the transmission ratio of the transmission path within the gearbox, creating an unnecessary correlation with the traveling state of the working machinery. This makes independent control difficult and results in poor flexibility.

[0033] To address the aforementioned technical problems, this application provides a transmission system and a working machine. The transmission system includes an independently configured gearbox, a power output box, and a transfer case. The gearbox connects to the traveling mechanism, drives the working machine, and switches gears by connecting different power transmission paths. The power output box connects to the first input shaft, directly receiving power from the drive unit. The engagement and disengagement of the power output box's power are independently controlled by an output clutch. Therefore, the rotational speed output from the second output shaft of the power output box does not need to be transmitted through the transmission components within the gearbox, thus overcoming the rigid constraint of the transmission ratio on the transmission path and achieving independent control of the power output box, decoupling it from the traveling state. Furthermore, the transfer case is the end effector, distributing the power output from the power output box to the various actuators of the working machine. The transmission relationship between its third input shaft and third output shaft can be flexibly configured according to the needs of the working machine. Therefore, the final output speed of the third output shaft depends only on the working condition of the drive unit and the transmission relationship in the transfer case, while the output speed of the first output shaft of the gearbox depends only on the specific conditions of the transmission path in the gearbox. Thus, the operating state of the actuator can be independently adjusted under different driving gears of the machine, which is beneficial to improving the flexibility and adaptability of the machine in complex operating scenarios.

[0034] The following is combined with Figures 1 to 2 The following describes embodiments of the present invention.

[0035] According to an embodiment of the present invention, see, in one aspect, Figure 1As shown, a transmission system for working machinery is provided, including: a gearbox 100, a power output box 200, and a transfer case 300. The gearbox 100 contains a first input shaft 110, a transmission assembly 120, and a first output shaft 130. One end of the first input shaft 110 is connected to the drive unit 10 of the working machinery. The first input shaft 110 and the first output shaft 130 are connected via the transmission assembly 120. The transmission assembly 120 is configured to establish at least two transmission paths between the first input shaft 110 and the first output shaft 130, and to control one of the at least two transmission paths to be connected. The transmission ratios of each transmission path are different. The first output shaft 130 is used for the movement of the working machinery. Mechanism connection; the power output box 200 is provided with a second input shaft 210, a second output shaft 220 and an output clutch 230. One end of the second input shaft 210 is connected to the other end of the first input shaft 110. The output clutch 230 is located between the other end of the second input shaft 210 and one end of the second output shaft 220 to control the engagement or disengagement of the second output shaft 220 and the second input shaft 210. The transfer case 300 is provided with a third input shaft 310 and a third output shaft 320. One end of the third input shaft 310 is connected to the other end of the second output shaft 220. The third output shaft 320 is drive-connected to the third input shaft 310 and is used to connect to the actuator of the working machinery.

[0036] In this embodiment, the gearbox 100, power output box 200, and transfer case 300 are all independently configured. The first output shaft 130 of the gearbox 100 is connected to the traveling mechanism of the working machinery, and the third output shaft 320 of the transfer case 300 is connected to the actuator of the working machinery. The transmission assembly 120 establishes multiple transmission paths between the first input shaft 110 and the first output shaft 130. Gear shifting is achieved by controlling the on / off state of different transmission paths, thereby adjusting the output speed of the first output shaft 130. Simultaneously, the traveling mechanism can be stopped by controlling all transmission paths to be disconnected. The second input shaft 210 in the power output box 200 directly receives the power of the drive unit 10 through the first input shaft 110. When the output clutch 230 is engaged, the power output box 200 transmits power to the transfer case 300. The transfer case 300 can set different transmission relationships between the third input shaft 310 and the third output shaft 320 according to the needs of the working machinery, thereby adjusting the output speed of the third output shaft 320. When the output clutch 230 is disengaged, the power transmission path of the power output box 200 is interrupted, and the third output shaft 320 stops outputting power.

[0037] Therefore, the transmission system provided in this embodiment regulates the speed of the first output shaft 130 output to the traveling mechanism and controls the start and stop of the traveling mechanism through the gearbox 100, regulates the speed of the third output shaft 320 output to the actuator through the transfer case 300, and controls the start and stop of the actuator through the power take-off box 200. For example, the working machine can start the actuator to perform work when it is stopped, or it can travel when the actuator is stopped, and flexibly adjust the working conditions of the actuator and the traveling mechanism. Thus, the traveling mechanism and the actuator can be independently controlled to start and stop and adjust speed. The start and stop of the third output shaft 320 and its output speed are no longer subject to the transmission ratio of the transmission path within the gearbox 100, realizing the decoupling of the transfer case 300 and the gearbox 100. This is beneficial to improving the flexibility of the transmission system and enhancing the adaptability of the working machine in complex working environments.

[0038] For example, the drive device 10 of the operating machinery can be an electric motor, and the output speed of the motor can be flexibly adjusted, which is beneficial to further improve the flexibility of the transmission system. This application embodiment does not limit this.

[0039] In practical implementation, if the drive device 10 is a motor, although the motor has a wide speed range, it is still necessary to set multiple transmission paths between the first input shaft 110 and the first output shaft 130 in the gearbox 100. By controlling the connection of different transmission paths, gear switching can be realized. On the one hand, the speed range of the gearbox 100 can be further expanded by setting the gears, thereby improving the speed regulation efficiency. On the other hand, the torque can be flexibly adjusted according to the needs of the actuator and the traveling mechanism during actual operation, thereby reducing motor energy consumption and improving the safety and reliability of the working machinery.

[0040] In some embodiments, the first input shaft 110 and the second input shaft 210 can be directly connected or a first connecting shaft 400 can be provided. The first input shaft 110 drives the second input shaft 210 to rotate through the first connecting shaft 400. The second output shaft 220 and the third input shaft 310 can be directly connected or a second connecting shaft 500 can be provided. The second output shaft 220 drives the third input shaft 310 to rotate through the second connecting shaft 500. By adjusting the lengths of the first connecting shaft 400 and the second connecting shaft 500, the distances between the gearbox 100 and the power output box 200, and between the power output box 200 and the transfer case 300 can be flexibly adjusted to adapt to the spatial layout needs of different working machines, which is beneficial to improving the compatibility of the transmission system. Of course, whether to provide the first connecting shaft 400 and the second connecting shaft 500, and the specific lengths of the first connecting shaft 400 and the second connecting shaft 500, are not limited in this application embodiment and can be reasonably set according to the actual needs of the working machine.

[0041] In one embodiment, see Figure 1 and Figure 2 As shown, the transmission assembly 120 includes a first clutch 1211, a second clutch 1221, a third clutch 1231, and a fourth clutch 1232; at least two transmission paths include a first transmission path, a second transmission path, a third transmission path, and a fourth transmission path; when the first clutch 1211 is engaged, and the second clutch 1221, the third clutch 1231, and the fourth clutch 1232 are all disengaged, the power of the first input shaft 110 is transmitted to the first output shaft 130 through the first transmission path; when the second clutch 1221 is engaged, and the first clutch 121 ... disengaged, the power of the first input shaft 110 is transmitted to the first output shaft 130 through the first transmission path; When all four clutches 1232 are disengaged, the power of the first input shaft 110 is transmitted to the first output shaft 130 through the second transmission path; when the third clutch 1231 is engaged, and the first clutch 1211, the second clutch 1221 and the fourth clutch 1232 are disengaged, the power of the first input shaft 110 is transmitted to the first output shaft 130 through the third transmission path; when the fourth clutch 1232 is engaged, and the first clutch 1211, the second clutch 1221 and the third clutch 1231 are disengaged, the power of the first input shaft 110 is transmitted to the first output shaft 130 through the fourth transmission path.

[0042] In practical implementation, the first clutch 1211, the second clutch 1221, the third clutch 1231, and the fourth clutch 1232 are all connected to the control system of the working machinery. The control system switches the transmission path by controlling the engagement or disengagement of the first clutch 1211, the second clutch 1221, the third clutch 1231, and the fourth clutch 1232, thereby achieving full-power gear shifting without power interruption during the shifting process. Combined with the speed adjustment of the drive device 10, it can achieve smooth and rapid speed adjustment of the traveling mechanism, which is simple to operate and highly flexible. For example, when the first clutch 1211 is engaged and the second clutch 1221, the third clutch 1231, and the fourth clutch 1232 are all disengaged, the control system can switch the transmission path from the first transmission path to the second transmission path by controlling the disengagement of the first clutch 1211 and the engagement of the second clutch 1221, achieving rapid gear shifting without power interruption, which is beneficial to improving the working efficiency of the working machinery.

[0043] In one embodiment, see Figure 1 and Figure 2As shown, the transmission assembly 120 includes a first transmission shaft 121, a first transmission gear 1212, and a second transmission gear 1213. The first transmission gear 1212 is connected to the first input shaft 110. The first transmission gear 1212 is fixedly connected to the first transmission shaft 121, and the second transmission gear 1213 is rotatably sleeved on the first transmission shaft 121 and is connected to the first output shaft 130. A first clutch 1211 is disposed on the first transmission shaft 121 and located between the first transmission gear 1212 and the second transmission gear 1213 to control the engagement or disengagement of the first transmission gear 1212 and the second transmission gear 1213. When the first clutch 1211 is engaged, and the second clutch 1221, the third clutch 1231, and the fourth clutch 1232 are all disengaged, the first transmission gear 1212 drives the second transmission gear 1213 to rotate through the first clutch 1211, thereby establishing a first transmission path between the first input shaft 110 and the first output shaft 130.

[0044] It is understood that the first clutch 1211 includes a first driving part and a first driven part that are rotatable relative to each other. The first driving part is connected to the first transmission gear 1212, and the first driven part is connected to the second transmission gear 1213. When the first clutch 1211 is engaged, the second transmission gear 1213 rotates synchronously with the first transmission gear 1212, the first transmission path is connected, and the power on the first input shaft 110 is transmitted to the first output gear in sequence through the first transmission gear 1212, the first clutch 1211, and the second transmission gear 1213. When the first clutch 1211 is disengaged, the first transmission gear 1212 and the second transmission gear 1213 are separated. When the first transmission gear 1212 rotates, the second transmission gear 1213 remains stationary. The first transmission shaft 121 and the second transmission gear 1213 do not interfere with each other, and the first transmission path is cut off.

[0045] Therefore, both the first transmission gear 1212 and the second transmission gear 1213 are fixed-axis gears. Compared with planetary gear sets in related technologies, the fixed-axis gears in this embodiment have lower machining precision requirements, which helps to save on the manufacturing and maintenance costs of the gearbox 100. Furthermore, when the first clutch 1211 disengages, the first transmission gear 1212 and the second transmission gear 1213 are independent and do not interfere with each other. Therefore, rapid switching of other transmission paths in the first transmission path box can be achieved without power interruption, improving the transmission efficiency of the transmission system.

[0046] In one embodiment, see Figure 1 and Figure 2As shown, the transmission assembly 120 also includes a second transmission shaft 122, a third transmission gear 1222, and a fourth transmission gear 1223; the third transmission gear 1222 is fixedly connected to the second transmission shaft 122, and the fourth transmission gear 1223 is rotatably sleeved on the second transmission shaft 122; the third transmission gear 1222 meshes with the first transmission gear 1212, the fourth transmission gear 1223 meshes with the second transmission gear 1213, and the fourth transmission gear 1223 is connected to the first output shaft 130; the second clutch 1221 is located on the second... On the drive shaft 122, and located between the third drive gear 1222 and the fourth drive gear 1223, to control the engagement or disengagement of the third drive gear 1222 and the fourth drive gear 1223; when the second clutch 1221 is engaged, and the first clutch 1211, the third clutch 1231 and the fourth clutch 1232 are all disengaged, the third drive gear 1222 drives the fourth drive gear 1223 to rotate through the second clutch 1221, so as to establish a second transmission path between the first input shaft 110 and the first output shaft 130.

[0047] In a specific implementation, the second clutch 1221 may include a second driving part and a second driven part that are rotatable relative to each other. The second driving part is connected to the third transmission gear 1222, and the second driven part is connected to the fourth transmission gear 1223. When the second clutch 1221 is engaged, the third transmission gear 1222 is connected to the fourth transmission gear 1223, so that the fourth transmission gear 1223 and the third transmission gear 1222 rotate synchronously. At this time, the first clutch 1211 is disengaged, and the first transmission gear 1212 and the second transmission gear 1213 are disengaged. Therefore, the second transmission path is connected, and the power on the first input shaft 110 passes sequentially through the first transmission gear 1212, the third transmission gear 1222, the first clutch 1211, and the fourth transmission gear 1223 to finally reach the first output shaft 130. When the second clutch 1221 is disengaged, the third transmission gear 1222 and the fourth transmission gear 1223 are disengaged, and the second transmission path is cut off.

[0048] Furthermore, since the second transmission gear 1213 meshes with the fourth transmission gear 1223, in the first transmission path, after the power is transmitted to the second transmission gear 1213, it continues to be transmitted to the first output shaft 130 through the fourth transmission gear 1223. It can be seen that both the first and second transmission paths need to transmit power through the fourth transmission gear 1223. The first and second transmission paths share some structures, which is beneficial to optimize the spatial layout within the gearbox 100, simplify the structure within the gearbox 100, improve the structural compactness, and thus save the manufacturing cost of the gearbox 100 and reduce the size of the gearbox 100.

[0049] In one embodiment, see Figure 1 and Figure 2As shown, the transmission assembly 120 also includes a third transmission shaft 123, a fifth transmission gear 1224, and a sixth transmission gear 1233; the fifth transmission gear 1224 is fixedly connected to the second transmission shaft 122, and the sixth transmission gear 1233 is rotatably sleeved on the third transmission shaft 123; the fifth transmission gear 1224 and the sixth transmission gear 1233 mesh, and the third transmission shaft 123 is connected to the first output shaft 130; the third clutch 1231 is provided on the third transmission shaft 123 to control the engagement or disengagement of the sixth transmission gear 1233 from the third transmission shaft 123; when the third clutch 1231 is engaged, and the first clutch 1211, the second clutch 1221, and the fourth clutch 1232 are all disengaged, the sixth transmission gear 1233 drives the third transmission shaft 123 to rotate through the third clutch 1231, so as to establish a third transmission path between the first input shaft 110 and the first output shaft 130.

[0050] In a specific implementation, the third clutch 1231 may include a third driving part and a third driven part that are rotatable relative to each other. The third driving part is connected to the sixth transmission gear 1233, and the third driven part is connected to the third transmission shaft 123. When the third clutch 1231 is engaged, the sixth transmission gear 1233 is connected to the third transmission shaft 123, thereby driving the third transmission shaft 123 to rotate synchronously. The third transmission path is connected, and the power of the first input shaft 110 passes sequentially through the first transmission gear 1212, the third transmission gear 1222, the second transmission shaft 122, the fifth transmission gear 1224, the sixth transmission gear 1233, and the third transmission shaft 123 to finally reach the first output shaft 130. When the third clutch 1231 is disengaged, the sixth transmission gear 1233 is disengaged from the third transmission shaft 123, and the sixth transmission gear 1233 only rotates freely relative to the third transmission shaft 123, thereby cutting off the third transmission path.

[0051] Therefore, the third transmission path shares the first transmission gear 1212 and the third transmission gear 1222 with the second transmission path, which helps to further reduce the number of parts in the gearbox 100, optimize the structural layout of the gearbox 100, and save the manufacturing cost and space occupied by the gearbox 100.

[0052] In one embodiment, see Figure 1 and Figure 2As shown, the transmission assembly 120 also includes a seventh transmission gear 1234; the seventh transmission gear 1234 is rotatably mounted on the third transmission shaft 123, and the fourth transmission gear 1223 meshes with the third transmission gear 1222; the fourth clutch 1232 is disposed on the third transmission shaft 123 to control the engagement or disengagement of the seventh transmission gear 1234 from the third transmission shaft 123; when the fourth clutch 1232 is engaged, the seventh transmission gear 1234 drives the third transmission shaft 123 to rotate through the fourth clutch 1232, so as to establish a fourth transmission path between the first input shaft 110 and the first output shaft 130.

[0053] In a specific implementation, the fourth clutch 1232 may include a fourth driving part and a fourth driven part that are rotatable relative to each other. The fourth driving part is connected to the seventh transmission gear 1234, and the fourth driven part is connected to the third transmission shaft 123. When the fourth clutch 1232 is engaged, the seventh transmission gear 1234 engages with the third transmission shaft 123 to drive the third transmission shaft 123 to rotate synchronously, and the fourth transmission path is connected. The power on the first input shaft 110 is transmitted to the first output shaft 130 in sequence through the first transmission gear 1212, the third transmission gear 1222, the seventh transmission gear 1234, and the third transmission shaft 123. When the fourth clutch 1232 is disengaged, the seventh transmission gear 1234 disengages from the third transmission shaft 123, and the seventh transmission gear 1234 rotates freely relative to the third transmission shaft 123, and the fourth transmission path is cut off.

[0054] Therefore, the fourth transmission path shares the first transmission gear 1212, the third transmission gear 1222, and the third transmission shaft 123 with the third transmission path, which can further reduce the number of parts, help reduce the failure rate of the gearbox 100, save the maintenance cost of the gearbox 100, and improve the reliability of the transmission system.

[0055] In one embodiment, see Figure 1 and Figure 2 As shown, the transmission assembly 120 also includes an eighth transmission gear 1225 and a ninth transmission gear 1235; the eighth transmission gear 1225 is rotatably sleeved on the second transmission shaft 122, and the eighth transmission gear 1225 is fixedly connected to the fourth transmission gear 1223; the ninth transmission gear 1235 is fixedly connected to the third transmission shaft 123, and the eighth transmission gear 1225 and the ninth transmission gear 1235 mesh, and the ninth transmission gear 1235 is connected to the first output shaft 130 in a transmission connection.

[0056] It is understandable that the eighth transmission gear 1225 is fixedly connected to the fourth transmission gear 1223, and the eighth transmission gear 1225 and the fourth transmission gear 1223 rotate synchronously. The fourth transmission gear 1223 can transmit power to the ninth transmission gear 1235 through the eighth transmission gear 1225, and finally to the first output shaft 130.

[0057] As can be seen, the first, second, third, and fourth transmission paths all begin with the first transmission gear 1212 and end at the ninth transmission gear 1235. Therefore, only one first driving gear 111 needs to be installed on the first input shaft 110, and correspondingly, only one first driven gear 131 needs to be installed on the first output shaft 130. This helps to reduce the number of gears and bearing span on the first input shaft 110 and the first output shaft 130, thereby improving the critical speed and shaft stiffness of the first output shaft 130. In addition, the highly integrated internal structure of the gearbox 100 also helps to simplify the design of the lubrication circuit in the transmission system and reduce the maintenance cost of the transmission system.

[0058] In one embodiment, see Figure 1 and Figure 2 As shown, a first driving gear 111 is provided on the first input shaft 110, and a first driven gear 131 is provided on the first output shaft 130; the first driving gear 111 meshes with the first transmission gear 1212, and the first driven gear 131 meshes with the ninth transmission gear 1235.

[0059] In a specific implementation, when the first transmission path is connected, the power on the first input shaft 110 is transmitted sequentially through the first driving gear 111, the first transmission gear 1212, the second transmission gear 1213, the first clutch 1211, the fourth transmission gear 1223, the eighth transmission gear 1225, the ninth transmission gear 1235 and the first driven gear 131 to the first output shaft 130.

[0060] When the second transmission path is connected, the power on the first input shaft 110 is transmitted sequentially through the first driving gear 111, the first transmission gear 1212, the third transmission gear 1222, the second clutch 1221, the fourth transmission gear 1223, the eighth transmission gear 1225, the ninth transmission gear 1235 and the first driven gear 131 to the first output shaft 130.

[0061] When the third transmission path is connected, the power on the first input shaft 110 is transmitted sequentially through the first driving gear 111, the first transmission gear 1212, the third transmission gear 1222, the second transmission shaft 122, the fifth transmission gear 1224, the sixth transmission gear 1233, the third clutch 1231, the third transmission shaft 123, the ninth transmission gear 1235, and the first driven gear 131 to the first output shaft 130.

[0062] When the fourth transmission path is connected, the power on the first input shaft 110 is transmitted sequentially through the first driving gear 111, the first transmission gear 1212, the third transmission gear 1222, the seventh transmission gear 1234, the fourth clutch 1232, the third transmission shaft 123, the ninth transmission gear 1235 and the first driven gear 131 to the first output shaft 130.

[0063] Therefore, the meshing relationship of each gear within the transmission 100 remains constant, simplifying the gear shifting process of the transmission 100 entirely to the switching of clutch states rather than changes in gear meshing positions. This eliminates the power interruption caused by changes in gear meshing positions during gear shifting, as is common in related technologies. Simultaneously, the first transmission gear 1212 serves as a unified input port for all transmission paths, and the ninth transmission gear 1235 serves as a unified output port for all transmission paths. This improves the stability of power distribution and merging during gear shifting, specifically during the overlapping engagement of the two clutches, preventing interference between transmission paths and enhancing the reliability of gear shifting within the transmission 100.

[0064] In one embodiment, see Figure 1 and Figure 2 As shown, it also includes a lock-up clutch 140, and a fixed part is provided in the gearbox 100; the lock-up clutch 140 includes a driving part and a driven part that can rotate relative to each other, the driving part is connected to the first output shaft 130, and the driven part is connected to the fixed part; when the lock-up clutch 140 is engaged, the driving part and the driven part are locked to lock the first output shaft 130.

[0065] It is understandable that the lock-up clutch 140 can be a normally open clutch, with the driving part rotating with the first output shaft 130 and the driven part connected to the fixed part. When the working machinery needs to park, the drive device 10 stops outputting power, but the first output shaft 130 will continue to rotate due to inertia. Therefore, a lock-up clutch 140 is required. By controlling the engagement of the lock-up clutch 140, a rigid friction lock is formed between the driving part and the driven part, thereby realizing the function of auxiliary braking, which is beneficial to improving the braking efficiency of the working machinery and improving the safety and reliability of the working machinery.

[0066] In addition, the locking clutch 140 can prevent the ground adhesion force from dragging the first output shaft 130 to rotate in the opposite direction through the tire, thereby avoiding the transmission assembly 120 from bearing alternating cyclic loads, which helps to reduce wear inside the transmission box and extend the service life of the transmission box.

[0067] In one embodiment, see Figure 1 and Figure 2 As shown, at least one of the first clutch 1211, the second clutch 1221, the third clutch 1231, the fourth clutch 1232, the lock-up clutch 140, and the output clutch 230 is a wet clutch.

[0068] It should be noted that the friction plates of a wet clutch are immersed in circulating oil. The combined effect of oil film shearing and forced convection provides heat dissipation and allows it to withstand higher sliding power and longer engagement duration. Therefore, by setting each clutch as a wet clutch, the frictional heat generated during clutch speed synchronization can be carried away by the oil in time, avoiding torque transmission failure caused by heat fade. This helps ensure shifting stability, achieves uninterrupted power shifting, reduces wear, extends the service life of the transmission system, and lowers the maintenance cost of the transmission system.

[0069] In one embodiment, see Figure 1 As shown, the transfer case 300 is also provided with at least one fourth drive shaft 330; the fourth drive shaft 330 is provided with a tenth drive gear 331, the third input shaft 310 is provided with a second drive gear 311, and the third output shaft 320 is provided with a second driven gear 321; the tenth drive gear 331 is connected to the second drive gear 311 and the second driven gear 321.

[0070] In a specific implementation, when the output clutch 230 is engaged, the first input shaft 110 drives the second input shaft 210 to rotate. The second input shaft 210 drives the second output shaft 220 to rotate through the output clutch 230. The second output shaft 220 drives the third input shaft 310 to rotate. The second driving gear 311 rotates synchronously with the third input shaft 310 and drives the second driven gear 321 to rotate through the tenth transmission gear 331. The second driven gear 321 drives the third output shaft 320 to rotate, thereby driving the actuator of the working machine to operate.

[0071] In this embodiment, multiple fourth drive shafts 330 can be arranged in parallel, each equipped with a tenth drive gear 331. Adjacent tenth drive gears 331 mesh with each other, and the first and last tenth drive gears 331 mesh with the second driving gear 311 and the second driven gear 321, respectively. Multiple third output shafts 320 can also be provided, allowing the transfer case 300 to connect to multiple actuators simultaneously. Alternatively, different third output shafts 320 can be selected according to the needs of the actuators, which helps the working machinery adapt to complex working conditions and improves its adaptability. Of course, the number of fourth drive shafts 330 and third output shafts 320 is not limited in this embodiment and can be reasonably set according to actual needs.

[0072] Further, see Figure 1As shown, a lubrication pump 340 can also be connected to one end of the fourth drive shaft 330. The lubrication pump 340 can be a mechanical pump. When the fourth drive shaft 330 rotates, it drives the rotor assembly of the mechanical pump to rotate, thereby ensuring that the lubrication pump 340 runs continuously during the operation of the actuator. This helps to ensure that the lubrication pump 340 can pump enough lubricating oil to each bearing and gear, ensure the heat dissipation efficiency of the transmission system, reduce the wear of the transmission system, improve the reliability of the transmission system, and extend the service life of the transmission system.

[0073] According to an embodiment of the present invention, on the other hand, see also... Figure 1 As shown, a working machine is also provided, including any of the above-mentioned transmission systems.

[0074] The specific structure and working principle of the transmission system have been described in detail in the above embodiments, and will not be repeated here.

[0075] In this embodiment, by setting up the above-mentioned transmission system, on the one hand, the gearbox 100 and the transfer case 300 can be deconstructed, and the walking mechanism and the actuator of the working machine can be independently controlled, thereby improving the flexibility of the working machine and its adaptability to complex working conditions. On the other hand, the first clutch 1211, the second clutch 1221, the third clutch 1231 and the fourth clutch 1232 can be engaged or disengaged by the control system of the working machine, thereby realizing the rapid switching of the transmission path and completing the gear shift without power interruption, which is beneficial to improving the accuracy of the working machine.

[0076] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A transmission system for use in machinery, characterized in that, include: A gearbox (100) is provided with a first input shaft (110), a transmission assembly (120) and a first output shaft (130). One end of the first input shaft (110) is used to connect to the drive device (10) of the working machine. The first input shaft (110) and the first output shaft (130) are connected by transmission assembly (120). The transmission assembly (120) is configured to establish at least two transmission paths between the first input shaft (110) and the first output shaft (130) and control one of the at least two transmission paths to be connected. The transmission ratio of each transmission path is different. The first output shaft (130) is used to connect to the walking mechanism of the working machine. A power output box (200) is provided with a second input shaft (210), a second output shaft (220) and an output clutch (230). One end of the second input shaft (210) is connected to the other end of the first input shaft (110). The output clutch (230) is located between the other end of the second input shaft (210) and one end of the second output shaft (220) to control the engagement or disengagement of the second output shaft (220) from the second input shaft (210). Transfer case (300), wherein a third input shaft (310) and a third output shaft (320) are provided inside the transfer case (300). One end of the third input shaft (310) is connected to the other end of the second output shaft (220). The third output shaft (320) is drivenly connected to the third input shaft (310). The third output shaft (320) is used to connect to the actuator of the working machine.

2. The transmission system according to claim 1, characterized in that, The transmission assembly (120) includes a first clutch (1211), a second clutch (1221), a third clutch (1231) and a fourth clutch (1232). The at least two transmission paths include a first transmission path, a second transmission path, a third transmission path, and a fourth transmission path; When the first clutch (1211) is engaged and the second clutch (1221), the third clutch (1231) and the fourth clutch (1232) are disengaged, the power of the first input shaft (110) is transmitted to the first output shaft (130) through the first transmission path. When the second clutch (1221) is engaged and the first clutch (1211), the third clutch (1231) and the fourth clutch (1232) are disengaged, the power of the first input shaft (110) is transmitted to the first output shaft (130) through the second transmission path. When the third clutch (1231) is engaged and the first clutch (1211), the second clutch (1221) and the fourth clutch (1232) are disengaged, the power of the first input shaft (110) is transmitted to the first output shaft (130) through the third transmission path. When the fourth clutch (1232) is engaged and the first clutch (1211), the second clutch (1221) and the third clutch (1231) are all disengaged, the power of the first input shaft (110) is transmitted to the first output shaft (130) through the fourth transmission path.

3. The transmission system according to claim 2, characterized in that, The transmission assembly (120) includes a first transmission shaft (121), a first transmission gear (1212), and a second transmission gear (1213). The first transmission gear (1212) is connected to the first input shaft (110) in a transmission connection; the first transmission gear (1212) is fixedly connected to the first transmission shaft (121), the second transmission gear (1213) is rotatably sleeved on the first transmission shaft (121), and the second transmission gear (1213) is connected to the first output shaft (130) in a transmission connection; The first clutch (1211) is disposed on the first drive shaft (121) and located between the first drive gear (1212) and the second drive gear (1213) to control the engagement or disengagement of the first drive gear (1212) and the second drive gear (1213); When the first clutch (1211) is engaged and the second clutch (1221), the third clutch (1231) and the fourth clutch (1232) are disengaged, the first transmission gear (1212) drives the second transmission gear (1213) to rotate through the first clutch (1211) to establish the first transmission path between the first input shaft (110) and the first output shaft (130).

4. The transmission system according to claim 3, characterized in that, The transmission assembly (120) also includes a second transmission shaft (122), a third transmission gear (1222), and a fourth transmission gear (1223). The third transmission gear (1222) is fixedly connected to the second transmission shaft (122), and the fourth transmission gear (1223) is rotatably sleeved on the second transmission shaft (122). The third transmission gear (1222) meshes with the first transmission gear (1212), the fourth transmission gear (1223) meshes with the second transmission gear (1213), and the fourth transmission gear (1223) is connected to the first output shaft (130) in a transmission connection. The second clutch (1221) is disposed on the second drive shaft (122) and located between the third drive gear (1222) and the fourth drive gear (1223) to control the engagement or disengagement of the third drive gear (1222) and the fourth drive gear (1223); When the second clutch (1221) is engaged and the first clutch (1211), the third clutch (1231) and the fourth clutch (1232) are all disengaged, the third transmission gear (1222) drives the fourth transmission gear (1223) to rotate through the second clutch (1221) to establish the second transmission path between the first input shaft (110) and the first output shaft (130).

5. The transmission system according to claim 4, characterized in that, The transmission assembly (120) also includes a third transmission shaft (123), a fifth transmission gear (1224), and a sixth transmission gear (1233). The fifth transmission gear (1224) is fixedly connected to the second transmission shaft (122), and the sixth transmission gear (1233) is rotatably sleeved on the third transmission shaft (123). The fifth transmission gear (1224) meshes with the sixth transmission gear (1233), and the third transmission shaft (123) is connected to the first output shaft (130) in a transmission connection. The third clutch (1231) is mounted on the third drive shaft (123) to control the engagement or disengagement of the sixth drive gear (1233) from the third drive shaft (123); When the third clutch (1231) is engaged and the first clutch (1211), the second clutch (1221) and the fourth clutch (1232) are disengaged, the sixth transmission gear (1233) drives the third transmission shaft (123) to rotate through the third clutch (1231) to establish the third transmission path between the first input shaft (110) and the first output shaft (130).

6. The transmission system according to claim 5, characterized in that, The transmission assembly (120) also includes a seventh transmission gear (1234). The seventh transmission gear (1234) is rotatably mounted on the third transmission shaft (123), and the fourth transmission gear (1223) meshes with the third transmission gear (1222). The fourth clutch (1232) is located on the third drive shaft (123) to control the engagement or disengagement of the seventh drive gear (1234) from the third drive shaft (123); When the fourth clutch (1232) is engaged, the seventh transmission gear (1234) drives the third transmission shaft (123) to rotate through the fourth clutch (1232) to establish the fourth transmission path between the first input shaft (110) and the first output shaft (130).

7. The transmission system according to claim 5, characterized in that, The transmission assembly (120) also includes an eighth transmission gear (1225) and a ninth transmission gear (1235). The first input shaft (110) is provided with a first driving gear (111), and the first output shaft (130) is provided with a first driven gear (131). The eighth transmission gear (1225) is rotatably sleeved on the second transmission shaft (122), and the eighth transmission gear (1225) is fixedly connected to the fourth transmission gear (1223); The ninth transmission gear (1235) is fixedly connected to the third transmission shaft (123), and the eighth transmission gear (1225) meshes with the ninth transmission gear (1235). The ninth transmission gear (1235) is connected to the first output shaft (130) in a transmission connection. The first driving gear (111) meshes with the first transmission gear (1212), and the first driven gear (131) meshes with the ninth transmission gear (1235).

8. The transmission system according to any one of claims 2-7, characterized in that, It also includes a lock-up clutch (140), and the gearbox (100) has a fixing part inside; The lock-up clutch (140) includes a driving part and a driven part that can rotate relative to each other. The driving part is connected to the first output shaft (130), and the driven part is connected to the fixed part. When the lock-up clutch (140) is engaged, the driving part locks with the driven part to lock the first output shaft (130).

9. The transmission system according to any one of claims 1-7, characterized in that, The transfer case (300) is also provided with at least one fourth drive shaft (330). The fourth transmission shaft (330) is provided with a tenth transmission gear (331), the third input shaft (310) is provided with a second driving gear (311), and the third output shaft (320) is provided with a second driven gear (321). The tenth transmission gear (331) is connected to both the second driving gear (311) and the second driven gear (321).

10. A type of operating machinery, characterized in that, Includes the transmission system as described in any one of claims 1-9.

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