Hybrid tracked tractor transmission system

Abstract

The utility model discloses hybrid crawler tractor transmission system belongs to agricultural machinery field, including engine, gearbox assembly, generator, battery group and walking unit, gearbox assembly includes first input shaft, first speed increasing gear set, two -way hydraulic clutch, first output shaft and second output shaft, the output of engine is linked with first input shaft, and first output shaft is linked with the rotor of generator, the input of two -way hydraulic clutch is linked with first input shaft, and two output ends of two -way hydraulic clutch are connected with second output shaft. The beneficial effects of the scheme are: engine generates electricity through the speed -up drive generator, improves the rotational speed and the power generation efficiency, and can also drive the second output shaft to work, and the energy utilization rate is higher, the clutch is post -positioned, and two -way hydraulic clutch can change gear for engine at any time, and is suitable for different work requirements, and the clutch function and the gear shifting function are combined together, and the structure is more compact.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, specifically to a hybrid tracked tractor transmission system. Background Technology

[0002] Tracked tractors consist of a power system, transmission system, walking system, steering system, braking system, electrical system, and hydraulic system. The power system includes a fuel engine, and the transmission system transmits the power output from the power system to the drive wheels, enabling the control system to control the driving state of the walking system.

[0003] To protect the environment and respond to energy conservation and emission reduction initiatives, hybrid transmission systems have been implemented in existing technologies. For example, patent application number 202411749756.6 discloses a hybrid tracked power chassis transmission system, which includes components such as an engine, generator, battery pack, and electric motor; the engine drives the generator to generate electricity and simultaneously drives the tillage shaft. Its shortcomings are: the engine and generator are directly connected, so the power generation efficiency depends entirely on the engine speed, resulting in low energy utilization; the engine also cannot freely shift gears for the tillage shaft, making it difficult to match different working requirements and limiting its application scenarios. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is: to provide a new hybrid tracked tractor transmission system to address the problems of low engine power generation efficiency, insufficient energy utilization, and inability of the work output shaft to flexibly shift gears to adapt to different work requirements in the existing hybrid tracked tractor transmission system.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a hybrid tracked tractor transmission system, including an engine, a gearbox assembly, a generator, a battery pack, and a walking unit; the gearbox assembly includes a first input shaft, a first speed-increasing gear set, a two-way hydraulic clutch, a first reduction gear, a second reduction gear, a first output shaft, and a second output shaft; the output shaft of the engine is connected to the first input shaft via a coupling; the input gear of the first speed-increasing gear set is mounted on the first input shaft, the output gear of the first speed-increasing gear set is mounted on the first output shaft, the first output shaft is connected to the rotor of the generator via a coupling, the output terminal of the generator is electrically connected to the input terminal of the battery pack after passing through a rectifier, and the output terminal of the battery pack is electrically connected to the walking unit; The bidirectional hydraulic clutch is connected to the first input shaft and has a first output drive gear and a second output drive gear. The first reduction gear and the second reduction gear are mounted on the second output shaft, wherein the first reduction gear meshes with the first output drive gear and the second reduction gear meshes with the second output drive gear.

[0006] The beneficial effects of this solution are as follows: the engine drives the generator to generate electricity through speed-increasing transmission, which improves the speed and power generation efficiency. At the same time, it can also drive the second output shaft to work, resulting in higher energy utilization and cost savings. The clutch is located at the rear, with the two-way hydraulic clutch placed between the first reduction gear and the second reduction gear, which facilitates remote control and can shift gears for the engine at any time, making it suitable for different working needs. Furthermore, the clutch function and the gear shifting function are combined together, resulting in a more compact structure.

[0007] Preferably, the bidirectional hydraulic clutch includes a spindle, one end of which is connected to a first input shaft and can rotate with the first input shaft. A baffle is fixedly provided in the middle of its outer wall, and receiving grooves are formed on both end faces of the baffle around the central axis of the spindle. Pistons, at least two external tooth friction plates, and at least one internal tooth friction plate are sequentially provided in the receiving grooves from the inside out. A gap exists between the side of the piston near the spindle and the bottom of the receiving groove. The external tooth friction plates and internal tooth friction plates are alternately arranged. The external tooth friction plates are slidably connected to the inner wall of the receiving groove via a spline structure. Transmission gears are sleeved on both sides of the receiving groove. A transmission ring is provided on the side of each transmission gear near the receiving groove. One end of the transmission ring is fixedly connected to the transmission gear, and the other end extends into the receiving groove. The internal tooth friction plate is sleeved on the transmission ring and slidably connected to the transmission ring via a spline structure. The transmission gears on both sides mesh with a first reduction gear and a second reduction gear, respectively. A retaining ring is also provided on the inner wall of each receiving groove opening. The spindle has a first oil supply channel, a second oil supply channel, and a return oil channel. The first oil supply channel is connected to the gap between the piston on one side of the baffle and the bottom of the receiving groove through an oil hole. The second oil supply channel is connected to the gap between the piston on the other side of the baffle and the bottom of the receiving groove through an oil hole. The return oil channel is connected to the gap between the pistons on both sides of the baffle and the bottom of the receiving groove through an oil hole. When oil is injected into the gap between either the piston and the bottom of the receiving groove through the first or second oil supply channel, the oil pressure pushes the piston on that side to move out of the groove and pushes the external tooth friction plate on that side to fit tightly against the internal tooth friction plate to transmit power.

[0008] The advantages of adopting the above-mentioned preferred solution are: power is input from the spindle and then output from the transmission gears on both sides. The transmission gears on both sides mesh with the first reduction gear and the second reduction gear respectively. When oil is injected into either side, the external tooth friction plate on that side can be driven to closely contact the internal tooth friction plate to transmit power, thereby realizing the clutch and shifting of the gearbox.

[0009] Preferably, the walking unit includes a motor one, a motor two, two track drive wheels, and two planetary reducers; Both motor one and motor two are electrically connected to the output terminals of the battery pack. A first gear is fixedly mounted on the output shaft of motor one, and the first gear meshes with a second gear. The input shafts of the two planetary reducers are located on both sides of the second gear and are fixedly connected to the end faces of the second gear. The output shafts of the two planetary reducers are respectively poweredly connected to the two track drive wheels. A third gear is fixedly mounted on the output shaft of motor two, and the third gear meshes with a fourth gear. The fourth gear is fixedly connected to a fifth gear through a first rotating shaft. The fourth gear meshes with the outer teeth of a planetary reducer gear ring. The fifth gear meshes with a first idler gear, and the first idler gear meshes with the outer teeth of another planetary reducer gear ring.

[0010] The advantages of adopting the above preferred scheme are as follows: when the tractor needs to go straight or backward, motor one drives two planetary reducers, and the two planetary reducers drive the two track drive wheels to move forward or backward respectively; when the tractor needs to turn in place, motor one does not move, and motor two drives the fourth gear and the first idler wheel to rotate. Since the fourth gear and the first idler wheel rotate in opposite directions, the gear rings of the two planetary reducers rotate in different directions, so that the output shafts of the two planetary reducers rotate in opposite directions, thereby realizing the turning of the two track drive wheels in place.

[0011] Preferably, the walking unit includes a motor, a motor, a motor, a third motor, two track drive wheels, and two planetary reducers; Motor 1, Motor 2 and Motor 3 are all electrically connected to the output terminals of the battery pack. A first gear is fixedly mounted on the output shaft of Motor 1. The first gear meshes with a second gear. The input shafts of the two planetary reducers are located on both sides of the second gear and are fixedly connected to the end faces of the second gear. The output shafts of the two planetary reducers are respectively powered to the two track drive wheels. A sixth gear is fixedly mounted on the output shafts of Motor 2 and Motor 3. The two sixth gears mesh with the outer teeth of the gear rings of the two planetary reducers.

[0012] The advantages of adopting the above-mentioned preferred scheme are as follows: When the tractor needs to go straight or backward, motor one drives the planetary reducer, and the two planetary reducers drive the two track drive wheels to move forward or backward respectively; when the tractor needs to turn on the spot, motor two and motor three drive the gear rings of the two planetary reducers to rotate forward or backward respectively, thereby changing the rotation direction of the output shaft of the planetary reducer and realizing the turning of the two track drive wheels on the spot; the separate control on both sides allows for a wider range of speed adjustment, enabling speed reduction turning and improving driving safety.

[0013] Preferably, the walking unit includes a first motor, a second motor, two track drive wheels, and two reducers; Both motor one and motor two are electrically connected to the output terminals of the battery pack. The output shafts of motor one and motor two are respectively fixedly connected to the input shaft of a reducer. The output shafts of the two reducers are respectively powered to the two track drive wheels.

[0014] The advantages of adopting the above-mentioned preferred scheme are: when the tractor needs to go straight or backward, motor one and motor two drive the reducer respectively, and the two reducers drive the two track drive wheels to move forward or backward respectively; when the tractor needs to turn on the spot, motor one and motor two rotate in different directions, and after being decelerated by the reducer, the two track drive wheels can turn on the spot; the structure is simple and the operation is more convenient. Attached Figure Description

[0015] Appendix Figure 1 This is a schematic diagram of the gearbox assembly of this utility model; Appendix Figure 2 This is a schematic diagram of the planetary reducer of this utility model; Appendix Figure 3 This is a schematic diagram of the bidirectional hydraulic clutch of this utility model; Appendix Figure 4 This is a schematic diagram of Embodiment 2 of the present invention; Appendix Figure 5 This is a schematic diagram of Embodiment 3 of the present invention.

[0016] Explanation of reference numerals in the attached diagram: 1. Engine; 2. Generator; 3. Battery pack; 4. First speed-increasing gear set; 5. Two-way hydraulic clutch; 6. First reduction gear; 7. Second reduction gear; 8. First input shaft; 9. Motor 1; 10. Motor 2; 11. Track drive wheel; 12. Planetary reducer; 13. First gear; 14. Second gear; 15. Third gear; 16. Fourth gear; 17. First shaft; 18. Fifth gear; 19. First idler gear; 20. Motor 3; 21. Sixth gear; 22. Reducer; 23. Battery management system; 24. First output shaft; 25. Second output shaft; 501. Spindle; 502. Baffle; 503. Receiving groove; 504. Piston; 505. External gear friction plate; 506. Internal gear friction plate; 507. Transmission ring; 508. Transmission gear; 509. Snap ring; 510. First oil supply channel; 511. Second oil supply channel; 512. Return oil channel; 1201, Sun Gear; 1202, Gear Ring; 1203, Planet Gear; 1204, Planet Carrier. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0018] Example 1 like Figures 1 to 2 As shown, the hybrid tracked tractor transmission system includes an engine 1, a gearbox assembly, a generator 2, a battery pack 3, and a walking unit. The gearbox assembly includes a first input shaft 8, a first speed-increasing gear set 4, a two-way hydraulic clutch 5, a first reduction gear 6, a second reduction gear 7, a first output shaft 24, and a second output shaft 25. The output shaft of the engine 1 is connected to the first input shaft 8 via a coupling. The input gear of the first speed-increasing gear set 4 is mounted on the first input shaft 8, and the output gear of the first speed-increasing gear set 4 is mounted on the first output shaft 24. The first output shaft 24 is connected to the rotor of the generator 2 via a coupling. The output terminals of the generator 2 are electrically connected to the input terminals of the battery pack 3 after passing through a rectifier. The output terminals of the battery pack 3 are electrically connected to the walking unit. The bidirectional hydraulic clutch 5 is connected to the first input shaft 8 and has a first output drive gear and a second output drive gear. The first reduction gear 6 and the second reduction gear 7 are mounted on the second output shaft 25, wherein the first reduction gear 6 meshes with the first output drive gear and the second reduction gear 7 meshes with the second output drive gear.

[0019] In this embodiment, the output shaft of the engine 1 is connected to and drives the first input shaft 8 to rotate. The first input shaft 8 drives the first output shaft 24 to rotate through the first speed-increasing gear set 4 (including a driving gear and a driven gear with a difference in the number of teeth between the two gears), thereby increasing the speed of the first output shaft 24. The first output shaft 24 then drives the rotor of the generator 2 to rotate. Due to the increased speed, the power generation efficiency can be improved. The rotor of the generator 2 rotates in the stator and cuts magnetic field lines to generate current. The current is output to the battery pack 3 for storage after passing through the rectifier (the rectifier can convert the alternating current (AC) of the generator into direct current (DC), and then supply the load or inverter after passing through the filter circuit; it can also stabilize the voltage of the battery pack 3; the power generation of the generator and the storage of electrical energy in the battery pack are existing technologies and will not be described in detail here). The current in the battery pack 3 is used to drive the walking unit.

[0020] Meanwhile, the first input shaft 8 is also connected to the input end of the two-way hydraulic clutch 5. The output end of the two-way hydraulic clutch 5 drives the second output shaft 25 to rotate, resulting in higher energy utilization of the engine 1 and cost savings.

[0021] Specifically, the first and second output drive gears of the bidirectional hydraulic clutch 5 can switch outputs, and then drive the second output shaft 25 to rotate through the first reduction gear 6 and the second reduction gear 7 respectively, which can shift the gears of the engine 1 at any time and is suitable for different working needs; and the clutch function and the shifting function are combined together, making the structure more compact.

[0022] The second output shaft 25 is a working shaft (or PTO shaft). The engine 1 outputs a speed of 2400 rpm, which is reduced to 750 rpm or 1000 rpm by the first reduction gear 6 and the second reduction gear 7 respectively, thereby increasing the torque of the working shaft.

[0023] In addition, speed-increasing transmission means that the output speed is greater than the input speed, while speed-reducing transmission means that the output speed is less than the input speed. In the field of gear transmission, speed-increasing and speed-reducing transmissions are usually determined by the difference in the number of teeth between the driving gear and the driven gear.

[0024] In addition, a battery management system 23 is connected in parallel between the battery pack 3 and the walking unit to monitor and control the input and output of the battery pack 3 in real time.

[0025] like Figure 3As shown, the bidirectional hydraulic clutch 5 includes a spindle 501, one end of which is connected to a first input shaft 8 and can rotate with the first input shaft 8. A baffle 502 is fixedly provided in the middle of its outer wall. The two end faces of the baffle are provided with receiving grooves 503 around the central axis of the spindle 501. Pistons 504, at least two external tooth friction plates 505 and at least one internal tooth friction plate 506 are arranged sequentially from the inside to the outside of the receiving grooves 503. There is a gap between the side of the piston 504 near the spindle 501 and the bottom of the receiving groove 503. The external tooth friction plates 505 and internal tooth friction plates 506 are alternately arranged. 5. The gear 508 is slidably connected to the inner wall of the receiving groove 503 via a spline structure; both sides of the receiving groove 503 are fitted with transmission gears 508, and a transmission ring 507 is respectively provided on the side of the transmission gear 508 near the receiving groove 503. One end of the transmission ring 507 is fixedly connected to the transmission gear 508, and the other end extends into the receiving groove 503; the internal tooth friction plate 506 is fitted on the transmission ring 507 and slidably connected to the transmission ring 507 via a spline structure; the transmission gears 508 on both sides mesh with the first reduction gear 6 and the second reduction gear 7 respectively; a retaining ring 509 is also provided on the inner wall of the opening of each of the two receiving grooves; The spindle 501 has a first oil supply channel 510, a second oil supply channel 511, and a return oil channel 512. The first oil supply channel 510 is connected to the gap between the piston 504 and the bottom of the receiving groove 503 on one side of the baffle 502 through an oil hole. The second oil supply channel 511 is connected to the gap between the piston 504 and the bottom of the receiving groove 503 on the other side of the baffle 502 through an oil hole. The return oil channel 512 is connected to the gap between the piston 504 and the bottom of the receiving groove 503 on both sides of the baffle 502 through an oil hole. When oil is injected into the gap between the bottom of either piston 504 and the receiving groove 503 through the first oil supply channel 510 or the second oil supply channel 511, the oil pressure pushes the piston 504 on that side to move out of the groove and pushes the external tooth friction plate 505 on that side to be in close contact with the internal tooth friction plate 506 to transmit power.

[0026] In this embodiment, as Figure 5 As shown, in the initial state, the left end of the spindle 501 has a spline structure and is connected to the first input shaft 8. When the spindle 501 rotates, it drives the baffle 502 and the receiving groove 503 to rotate. Since the external tooth friction plates 505 on both sides and the receiving groove 503 are connected by a spline structure, the external tooth friction plates 505 on both sides will rotate with the spindle 501. When the external tooth friction plates 505 and the internal tooth friction plates 506 are not in contact, the friction is small, and the piston 504, the internal tooth friction plates 506, the transmission ring 507, and the transmission gear 508 do not rotate.

[0027] The two transmission gears 508 are the first output drive gear and the second output drive gear mentioned above. The two transmission gears 508 are engaged with the first reduction gear 6 and the second reduction gear 7, respectively.

[0028] When oil is injected into the first oil supply channel 510, and the oil enters the gap between the piston 504 on the right and the bottom of the receiving groove 503 through the oil hole, the oil pressure pushes the piston 504 on the right to slide to the right. The piston 504 pushes the external tooth friction plate 505 to slide to the right. The external tooth friction plate 505 and the alternately arranged internal tooth friction plates 506 approach each other until the rightmost external tooth friction plate 505 abuts against the right retaining ring 509 and can no longer move. At this time, the external tooth friction plate 505 is in close contact with and drives the internal tooth friction plate 506 to rotate. The internal tooth friction plate 506 drives the transmission ring 507 to rotate. The transmission ring 507 drives the transmission gear 508. The transmission gear 508 drives the second reduction gear 7 to rotate, thus outputting power. When oil is injected into the second oil supply channel 511, the oil enters the gap between the piston 504 on the left and the bottom of the receiving groove 503 through the oil hole. The oil pressure pushes the piston 504 on the left to slide to the left. The piston 504 pushes the external tooth friction plate 505 to slide to the left. The external tooth friction plate 505 and the alternately arranged internal tooth friction plates 506 approach each other until the leftmost external tooth friction plate 505 abuts against the left retaining ring 509 and can no longer move. At this time, the external tooth friction plate 505 is in close contact with and drives the internal tooth friction plate 506 to rotate. The internal tooth friction plate 506 drives the transmission ring 507 to rotate. The transmission ring 507 drives the transmission gear 508. The transmission gear 508 drives the first reduction gear 6 to rotate, thus outputting power.

[0029] The two transmission gears 508 represent two output gears respectively; when neither side of the receiving groove 503 is filled with oil, it is in neutral; when oil is filled on either side, it pushes the piston 504, and the piston 504 pushes the external tooth friction plate 505 and the internal tooth friction plate 506 to come into close contact, thus transmitting power; the first oil supply channel 510 and the second oil supply channel 511 will not be filled with oil at the same time; when it is necessary to release the pistons 504 on both sides, the oil pump will draw the oil in the receiving grooves 503 on both sides out along the oil return channel 512, the piston 504 loses the oil pressure thrust, and the external tooth friction plate 505 and the internal tooth friction plate 506 no longer come into close contact to transmit power; the two-way hydraulic clutch 5 has the functions of shifting gears and disengaging the clutch.

[0030] As a parallel technical solution in this embodiment, the oil return channel 512 can also be designed as follows: the oil return channel 512 is connected to the gap between the piston 504 and the external tooth friction plate 505 on both sides of the baffle 502 through the oil hole; when it is necessary to release the piston 504, oil is injected into the gap between the piston 504 and the external tooth friction plate 505, and the oil pressure can push the piston 504 to move away from the external tooth friction plate 505, so that the external tooth friction plate 505 and the internal tooth friction plate 506 no longer closely adhere to transmit power.

[0031] As a parallel technical solution in this embodiment, the oil return channel 512 can also be replaced with a return spring. Two return springs are sleeved on both ends of the spindle 501 and located in the receiving groove 503. A retaining ring is also provided on the side of the transmission gear 508 facing the receiving groove 503. One end of the return spring abuts against the retaining ring, and the other end abuts against the piston 504. In the absence of oil pressure, the return spring pushes the piston 504 away from the external tooth friction plate 505.

[0032] like Figure 1 and Figure 2 As shown, the walking unit includes a first motor 9, a second motor 10, two track drive wheels 11, and two planetary reducers 12; Both motor 9 and motor 10 are electrically connected to the output terminals of battery pack 3. A first gear 13 is fixedly mounted on the output shaft of motor 9, and the first gear 13 meshes with the second gear 14. The input shafts of the two planetary reducers 12 are located on both sides of the second gear 14 and are fixedly connected to the end faces of the second gear 14. The output shafts of the two planetary reducers 12 are respectively poweredly connected to the two track drive wheels 11. A third gear 15 is fixedly mounted on the output shaft of motor 10, and the third gear 15 meshes with the fourth gear 16. The fourth gear 16 is fixedly connected to the fifth gear 18 through the first rotating shaft 17. The fourth gear 16 meshes with the external teeth of the gear ring of a planetary reducer 12. The fifth gear 18 meshes with the first idler gear 19, and the first idler gear 19 meshes with the external teeth of the gear ring of another planetary reducer 12.

[0033] In this embodiment, when the tractor needs to go straight or backward, motor 9 drives two planetary reducers 12, which in turn drive two track drive wheels 11 to move forward or backward. When the tractor needs to turn in place, motor 9 remains stationary, and motor 10 drives the fourth gear 16 and the first idler wheel 19 to rotate. Since the fourth gear 16 and the first idler wheel 19 rotate in opposite directions, the gear rings of the two planetary reducers 12 rotate in different directions, causing the output shafts of the two planetary reducers 12 to rotate in opposite directions, thereby enabling the two track drive wheels 11 to turn in place.

[0034] Specifically, the planetary reducers 12 on both the left and right sides each include a sun gear 1201, a ring gear 1202, planet gears 1203, and a planet carrier 1204; a sun gear input shaft is fixedly connected to the sun gear 1201, and a planet carrier output shaft is fixedly connected to the planet carrier 1204, which is connected to the track drive wheel 11; the planet gears 1203 are rotatably installed inside the planet carrier 1204, and the inner and outer sides of the ring gear 1202 are respectively provided with internal teeth and external teeth. One side of the planet gear 1203 meshes with the sun gear 1201, and the other side meshes with the internal teeth of the ring gear 1202; When the tractor needs to go straight or backward, the motor 9 drives the first gear 13 to rotate, the first gear 13 drives the second gear 14, and the second gear 14 drives the sun gear input shafts on both sides respectively. The power is transmitted through the sun gear input shaft, the sun gear 1201, the planet gear 1203, the planet carrier 1204 and the planet carrier output shaft, and finally output to the track drive wheel 11.

[0035] When the tractor needs to turn on the spot, motor 19 remains stationary, motor 210 drives the third gear 15, the third gear 15 drives the fourth gear 16 and the fifth gear 18 to rotate simultaneously, the fourth gear 16 directly meshes with the external teeth of the gear ring 1202 of the right planetary reducer 12 and drives the right gear ring 1202 to rotate, the right gear ring 1202 drives the right planetary gear 1203 to rotate; at this time, the right sun gear 1201 remains stationary, the right planetary gear 1203 drives the right planetary carrier 1204 to rotate, and finally the output shaft of the right planetary carrier outputs to the right track drive wheel 11; The fifth gear 18 meshes with the external teeth of the gear ring 1202 of the left planetary reducer 12 through the first idler gear 19, and drives the left gear ring 1202 to rotate. The left gear ring 1202 drives the left planet gear 1203 to rotate. Since the left sun gear 1201 is stationary at this time, the left planet gear 1203 drives the left planet carrier 1204 to rotate, and finally outputs the rotation to the left track drive wheel 11 through the output shaft of the left planet carrier. Since an idler gear is added on the left, the rotation direction input to the two gear rings 1202 is opposite, and the rotation direction of the output shafts of the two planet carriers is opposite, thereby making the two track drive wheels 11 move in opposite directions, realizing turning in place.

[0036] When it is necessary to move forward while turning to one side (left or right), motor 19 drives the two track drive wheels 11 to rotate via two planetary reducers 12; at the same time, motor 210 drives the third gear 15, the third gear 15 drives the fourth gear 16 and the fifth gear 18 to rotate simultaneously, the fourth gear 16 drives the gear ring 1202 of the right planetary reducer 12 to rotate, and the speed of the right gear ring 1202 is superimposed with that of the right sun gear 1201; the fifth gear 18 drives the gear ring 1202 of the left planetary reducer 12 to rotate via the first idler gear 19, and the speed of the left gear ring 1202 is superimposed with that of the left sun gear 1201, forming a power convergence; since the two sides rotate in opposite directions, one side accelerates the gear ring 1202 and the other side decelerates the gear ring 1202, and the output shafts of the planetary carriers on both sides generate a speed difference, and the track drive wheels 11 on both sides generate a speed difference, realizing unilateral turning to the side with lower speed.

[0037] Example 2 like Figure 4 As shown, as a parallel arrangement of the walking unit, the walking unit includes a first motor 9, a second motor 10, a third motor 20, two track drive wheels 11, and two planetary reducers 12. The first motor 9, the second motor 10, and the third motor 20 are all electrically connected to the output terminals of the battery pack 3. A first gear 13 is fixedly mounted on the output shaft of the first motor 9. The first gear 13 meshes with the second gear 14. The input shafts of the two planetary reducers 12 are located on both sides of the second gear 14 and are fixedly connected to the end faces of the second gear 14. The output shafts of the two planetary reducers 12 are respectively poweredly connected to the two track drive wheels 11. A sixth gear 21 is fixedly mounted on the output shafts of the second motor 10 and the third motor 20. The two sixth gears 21 mesh with the outer teeth of the gear rings of the two planetary reducers 12.

[0038] In this embodiment, when the tractor needs to go straight or backward, motor 9 drives planetary reducer 12, and the two planetary reducers 12 drive the two track drive wheels 11 to move forward or backward respectively; when the tractor needs to turn on the spot, motor 10 and motor 20 drive the gear rings of the two planetary reducers 12 to rotate forward or backward respectively, thereby changing the rotation direction of the output shaft of the planetary reducer 12 and realizing the turning of the two track drive wheels 11 on the spot; the separate control on both sides allows for a wider speed adjustment range, enabling speed reduction turning and improving driving safety.

[0039] Specifically, the planetary reducers 12 on both the left and right sides each include a sun gear 1201, a ring gear 1202, planet gears 1203, and a planet carrier 1204; a sun gear input shaft is fixedly connected to the sun gear 1201, and a planet carrier output shaft is fixedly connected to the planet carrier 1204, which is connected to the track drive wheel 11; the planet gears 1203 are rotatably installed inside the planet carrier 1204, and the inner and outer sides of the ring gear 1202 are respectively provided with internal teeth and external teeth. One side of the planet gear 1203 meshes with the sun gear 1201, and the other side meshes with the internal teeth of the ring gear 1202; When the tractor needs to go straight or backward, the motor 9 drives the first gear 13 to rotate, the first gear 13 drives the second gear 14, and the second gear 14 drives the sun gear input shafts on both sides respectively. The power is output to the track drive wheel 11 after passing through the sun gear input shaft, sun gear 1201, planet gear 1203, planet carrier 1204 and planet carrier output shaft.

[0040] When the tractor needs to turn on the spot, motor 19 remains stationary, while motors 20 and 30 each drive a sixth gear 21. The sixth gear 21 meshes with the external teeth of the ring gears 1202 of the planetary reducers 12 on the left and right sides. Since the sun gear 1201 remains stationary, it is only necessary to control the rotation direction of motors 20 and 30 to be opposite, which ensures that the input rotation direction of the ring gears 1202 on both sides is opposite. The ring gears 1202 on both sides drive the planetary gears 1203 on both sides to rotate. The planetary gears 1203 drive the planet carriers 1204 on both sides to rotate in opposite directions. The output shafts of the planet carriers on both sides rotate in opposite directions, thereby causing the track drive wheels 11 on both sides to move in opposite directions, thus achieving turning on the spot.

[0041] When it is necessary to move forward while turning to one side (left or right), motor 19 drives the two track drive wheels 11 to rotate via two planetary reducers 12; at the same time, motor 20 and motor 3 rotate in opposite directions and drive a sixth gear 21 respectively. The sixth gear 21 meshes with the outer teeth of the gear ring 1202 of the planetary reducers 12 on the left and right sides respectively. The speed of the right gear ring 1202 and the right sun gear 1201 are superimposed to form a power flow; the speed of the left gear ring 1202 and the left sun gear 1201 are superimposed to form a power flow. Since the rotation directions of the gear rings on both sides are opposite, one side accelerates the gear ring 1202 and the other side decelerates the gear ring 1202. The output shafts of the planetary carriers on both sides generate a speed difference, and the track drive wheels 11 on both sides generate a speed difference, realizing unilateral turning to the side with lower speed.

[0042] Compared to Embodiment 1, this solution has a simpler structure. By precisely controlling the speed and direction of rotation of motors 10 and 20 on both sides, the direction and speed of turning on the spot can be adjusted arbitrarily. With separate control on both sides, the speed adjustment range is larger, which can realize deceleration turning and improve driving safety.

[0043] Example 3 like Figure 5 As shown, as a parallel arrangement of the walking unit, the walking unit includes a first motor 9, a second motor 10, two track drive wheels 11, and two reducers 22. Both motor 9 and motor 10 are electrically connected to the output terminals of battery pack 3. The output shafts of motor 9 and motor 10 are respectively fixedly connected to the input shaft of a reducer 22. The output shafts of the two reducers 22 are respectively powered to the two track drive wheels 11.

[0044] In this embodiment, when the tractor needs to go straight or backward, motor 9 and motor 10 drive the input shaft of reducer 22 respectively, and the output shaft of the two reducers 22 drive the two track drive wheels 11 to move forward or backward respectively; when the tractor needs to turn on the spot, motor 9 and motor 10 rotate in different directions, and after being decelerated by reducer 22, the two track drive wheels 11 rotate in opposite directions to achieve turning on the spot; the structure is simple and the operation is more convenient.

[0045] When it is necessary to move forward while turning on one side (left or right), motor 9 and motor 10 are adjusted to different speeds, so that the two track drive wheels 11 produce a speed difference, thus achieving unilateral turning.

[0046] Specifically, the reducer 22 can be any type of gear reducer, worm gear reducer, or planetary gear reducer.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A hybrid tracked tractor transmission system, characterized in that, The system includes an engine (1), a gearbox assembly, a generator (2), a battery pack (3), and a walking unit. The gearbox assembly includes a first input shaft (8), a first speed-increasing gear set (4), a two-way hydraulic clutch (5), a first reduction gear (6), a second reduction gear (7), a first output shaft (24), and a second output shaft (25). The output shaft of the engine (1) is connected to the first input shaft (8) via a coupling. The input gear of the first speed-increasing gear set (4) is mounted on the first input shaft (8), and the output gear of the first speed-increasing gear set (4) is mounted on the first output shaft (24). The first output shaft (24) is connected to the rotor of the generator (2) via a coupling. The output terminal of the generator (2) is electrically connected to the input terminal of the battery pack (3) after passing through a rectifier. The output terminal of the battery pack (3) is electrically connected to the walking unit. The bidirectional hydraulic clutch (5) is connected to the first input shaft (8) and has a first output drive gear and a second output drive gear. The first reduction gear (6) and the second reduction gear (7) are mounted on the second output shaft (25). The first reduction gear (6) meshes with the first output drive gear, and the second reduction gear (7) meshes with the second output drive gear.

2. The hybrid tracked tractor transmission system according to claim 1, characterized in that, The bidirectional hydraulic clutch (5) includes a spindle (501), one end of which is connected to a first input shaft (8) and can rotate with the first input shaft (8). A baffle (502) is fixedly provided in the middle of its outer wall. The two end faces of the baffle (502) are provided with receiving grooves (503) around the central axis of the spindle (501). The receiving grooves (503) on both sides are provided with pistons (504), at least two external tooth friction plates (505) and at least one internal tooth friction plate (506) in sequence from the inside to the outside. There is a gap between the side of the piston (504) near the spindle (501) and the bottom of the receiving groove (503). The external tooth friction plates (505) and internal tooth friction plates (506) are alternately arranged. 505) is slidably connected to the inner wall of the receiving groove (503) through a spline structure; both sides of the receiving groove (503) are fitted with transmission gears (508), and a transmission ring (507) is provided on the side of the transmission gear (508) near the receiving groove (503). One end of the transmission ring (507) is fixedly connected to the transmission gear (508), and the other end extends into the receiving groove (503); the internal tooth friction plate (506) is fitted on the transmission ring (507) and slidably connected to the transmission ring (507) through a spline structure; the transmission gears (508) on both sides are respectively meshed with the first reduction gear (6) and the second reduction gear (7); a retaining ring (509) is also provided on the inner wall of the opening of the two receiving grooves respectively. The spindle (501) has a first oil supply channel (510), a second oil supply channel (511), and a return oil channel (512). The first oil supply channel (510) is connected to the piston (504) on one side of the baffle (502) and the bottom of the receiving groove (503) through an oil hole; the second oil supply channel (511) is connected to the piston (504) on the other side of the baffle (502) and the bottom of the receiving groove (503) through an oil hole; the return oil channel... The channel (512) is connected to the gap between the piston (504) on both sides of the baffle (502) and the bottom of the receiving groove (503) through the oil hole; when the oil is injected into the gap between the piston (504) and the bottom of the receiving groove (503) through the first oil supply channel (510) or the second oil supply channel (511), the oil pressure pushes the piston (504) on that side to move out of the groove, and pushes the external tooth friction plate (505) on that side to fit tightly with the internal tooth friction plate (506) to transmit power.

3. The hybrid tracked tractor transmission system according to claim 1 or 2, characterized in that, The walking unit includes a motor (9), a motor (10), two track drive wheels (11), and two planetary reducers (12). Both motor 1 (9) and motor 2 (10) are electrically connected to the output terminals of battery pack (3). A first gear (13) is fixedly mounted on the output shaft of motor 1 (9). The first gear (13) meshes with the second gear (14). The input shafts of the two planetary reducers (12) are located on both sides of the second gear (14) and are fixedly connected to the end faces of the second gear (14). The output shafts of the two planetary reducers (12) are respectively connected to the two track drive wheels (11). A third gear (15) is fixedly mounted on the output shaft of motor 2 (10). The third gear (15) meshes with the fourth gear (16). The fourth gear (16) is fixedly connected to the fifth gear (18) through the first rotating shaft (17). The fourth gear (16) meshes with the outer teeth of the gear ring of a planetary reducer (12). The fifth gear (18) meshes with the first idler gear (19). The first idler gear (19) meshes with the outer teeth of the gear ring of another planetary reducer (12).

4. The hybrid tracked tractor transmission system according to claim 1 or 2, characterized in that, The walking unit includes a motor (9), a motor (10), a motor (20), two track drive wheels (11), and two planetary reducers (12). The first motor (9), the second motor (10), and the third motor (20) are all electrically connected to the output terminals of the battery pack (3). The first gear (13) is fixedly mounted on the output shaft of the first motor (9). The first gear (13) meshes with the second gear (14). The input shafts of the two planetary reducers (12) are located on both sides of the second gear (14) and are fixedly connected to the end faces of the second gear (14). The output shafts of the two planetary reducers (12) are poweredly connected to the two track drive wheels (11). The output shafts of the second motor (10) and the third motor (20) are fixedly mounted with a sixth gear (21). The two sixth gears (21) mesh with the outer teeth of the gear rings of the two planetary reducers (12).

5. The hybrid tracked tractor transmission system according to claim 1 or 2, characterized in that, The walking unit includes a motor (9), a motor (10), two track drive wheels (11), and two reducers (22). Both motor one (9) and motor two (10) are electrically connected to the output terminals of the battery pack (3). The output shafts of motor one (9) and motor two (10) are fixedly connected to the input shaft of a reducer (22). The output shafts of the two reducers (22) are poweredly connected to the two track drive wheels (11).

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