Crawler tractor chassis structure capable of carrying power gear shifting device

Abstract

The invention discloses a caterpillar tractor chassis structure capable of carrying a power gear shifting device, and relates to the technical field of tractors, the caterpillar tractor chassis structure comprises a rack, a power assembly is arranged on the rack, a transmission case assembly is further arranged on the rear side of the rack, the input end of the transmission case assembly is connected with the power assembly, and the output end of the transmission case assembly is connected with the power assembly. A transmission box assembly is arranged on the machine frame, the output end of the transmission box assembly is connected with a driving wheel output shaft, driving wheels are arranged at the two ends of the driving wheel output shaft, crawler wheel train assemblies are symmetrically arranged on the two sides of the machine frame, crawler belts are wound on the crawler wheel train assemblies in a tensioning mode, and the crawler belts are meshed with the driving wheels respectively. The wheel type tractor has the advantages of being stable in walking, high in road holding force and even in ground pressure in the complex and severe plowing environment, so that the operation reliability and flexibility of the whole tractor can be improved, and the problems that a traditional wheel type tractor is difficult to adapt to plowing and walking in small plots and complex environments in the south of China are solved.

Description

Technical Field

[0001] This application relates to the technical field of tractors, and in particular to a tracked tractor chassis structure capable of carrying a power shift device. Background Technology

[0002] In my country's vast hilly and mountainous areas, scattered farmland, small plots, steep slopes, and complex terrain have made agricultural mechanization a persistent challenge and pain point. For a long time, farmers have relied heavily on small wheeled tractors for farming and transportation.

[0003] However, wheeled tractors have significant shortcomings in this type of terrain: First, they lack traction, easily slipping on wet slopes or loose soil, resulting in low efficiency and a risk of tipping over; second, they exert high ground pressure, causing severe soil compaction, which is detrimental to soil and water conservation and crop growth; third, their climbing and obstacle-crossing abilities are limited, making them unsuitable for steep slopes, field ridges, and rugged roads. These shortcomings severely restrict the improvement of agricultural mechanization and agricultural production efficiency in hilly and mountainous areas.

[0004] Therefore, there is an urgent need for a new type of power equipment with low ground pressure, strong adhesion, excellent climbing performance and flexible steering to replace and supplement it, which is the key background for the application of low horsepower tracked tractors. Summary of the Invention

[0005] The purpose of this application is to provide a tracked tractor chassis structure that can be equipped with a power shift device. Its advantage lies in its large track ground contact area, which results in low ground pressure and extremely strong adhesion. This not only effectively overcomes the risk of slipping and overturning on wet and steep slopes, demonstrating excellent passability and safety, but also significantly reduces soil compaction, achieving a dual improvement in traction efficiency and terrain adaptability.

[0006] The technical solution for a tracked tractor chassis structure capable of carrying a power shift device provided in this application is as follows: A tracked tractor chassis structure capable of carrying a power shift device includes a frame, a powertrain mounted on the frame, a transmission assembly mounted on the rear side of the frame, an input end of the transmission assembly connected to the powertrain, an output end of the transmission assembly connected to a drive wheel output shaft, drive wheels mounted at both ends of the drive wheel output shaft, and track wheel assemblies symmetrically arranged on both sides of the frame, with tracks tensioned and wound around the two track wheel assemblies, and the two tracks respectively engaging with the two drive wheels.

[0007] Furthermore, the transmission assembly includes a front transmission assembly, an intermediate transmission assembly, and a rear transmission assembly; the input end of the front transmission assembly is connected to the output end of the powertrain, the output end of the front transmission assembly is connected to the input end of the intermediate transmission assembly, the output end of the intermediate transmission assembly is connected to the input end of the rear transmission assembly, the drive wheel output shaft is rotatably disposed within the rear transmission assembly, and the output end of the rear transmission assembly is connected to the drive wheel output shaft.

[0008] Furthermore, the front transmission assembly includes a front transmission housing mounted on the frame. A front transmission main shaft and a front transmission output shaft are rotatably mounted inside the front transmission housing. A front transmission gear set is provided between the front transmission main shaft and the front transmission output shaft. The engine output end of the powertrain is connected to a drive shaft. One end of the drive shaft is connected to one end of the front transmission main shaft through a connecting sleeve. One end of the front transmission output shaft is connected to the input end of the intermediate transmission assembly through a clutch, and the other end is connected to a hydraulic pump on the powertrain.

[0009] Furthermore, the intermediate transmission assembly includes an intermediate transmission housing disposed on one side of the front transmission housing. An intermediate transmission shaft is rotatably mounted on the front side of the intermediate transmission housing. The front end of the intermediate transmission shaft is connected to the rear end of the front transmission output shaft via the clutch. An intermediate transmission main shaft, two intermediate shift shafts, and an intermediate auxiliary transmission shaft are also rotatably mounted inside the intermediate transmission housing. The front end of the intermediate transmission main shaft is rotatably connected to the rear end of the intermediate transmission shaft. The front end of the intermediate auxiliary transmission shaft is simultaneously connected to the front end of the intermediate transmission main shaft and... An intermediate transmission gear set is provided between the rear ends of the intermediate transmission shaft. One intermediate shift shaft is equipped with a first- or third-speed power shift component, and the other intermediate shift shaft is equipped with a second- or fourth-speed power shift component. The first- or third-speed power shift component and the second- or fourth-speed power shift component are connected to the intermediate transmission main shaft by a shift gear set. The rear ends of the two intermediate shift shafts and the middle end of the intermediate transmission main shaft are connected to the rear transmission box assembly through a high- or low-gear adjustment component. The end of the intermediate transmission main shaft is connected to the rear transmission box assembly.

[0010] Furthermore, the rear transmission housing assembly includes a rear transmission housing disposed on one side of the intermediate transmission housing. The drive wheel output shaft is rotatably disposed inside the rear transmission housing. A rear linkage gear assembly is disposed between the shaft of the drive wheel output shaft and the output end of the high / low gear adjustment component. A rear transmission main shaft, a PTO output shaft, and a reverse gear shaft are also rotatably disposed inside the rear end of the rear transmission housing. The front end of the rear transmission main shaft is connected to the end of the intermediate transmission main shaft through a second connector. A meshing sleeve assembly is disposed between the rear transmission main shaft, the PTO output shaft, and the reverse gear shaft.

[0011] Furthermore, the rear linkage gear assembly includes a rear linkage shaft disposed in the rear transmission housing, a rear linkage helical gear set disposed between one end of the rear linkage shaft and the high / low gear adjustment assembly, and a rear linkage gear set disposed between the other end of the rear linkage shaft and the shaft of the drive wheel output shaft.

[0012] Furthermore, the track wheel assembly includes a chassis frame disposed on one side of the frame. A front guide driven wheel is rotatably disposed at the front end of the chassis frame via a tensioning assembly, and a rear guide driven wheel is rotatably disposed at the rear end of the chassis frame. A plurality of toothed blocks are disposed on the inner side of the track, and the plurality of toothed blocks respectively cooperate with the front guide driven wheel, the rear guide driven wheel and the drive wheel. A plurality of anti-deviation devices that cooperate with the inner side of the track are symmetrically disposed at both ends of one side of the chassis frame, and a floating mechanism that cooperates with the inner side of the track is disposed in the middle of the chassis frame.

[0013] Furthermore, the anti-deviation device includes fixed shafts symmetrically arranged on one side of the chassis frame. Each of the two fixed shafts is rotatably mounted with a support roller via bearings. The two support rollers are respectively pressed against the inner side of the track. Anti-deviation circular tubes are provided between the middle part of the two support rollers and the middle part of a plurality of toothed blocks. A fixed frame is also provided on one side of the chassis frame. An abutment plate is provided on one side of the fixed frame via a plurality of locking elements. The abutment plate abuts against the anti-deviation circular tube.

[0014] Furthermore, the floating mechanism includes a stabilizing frame disposed on one side of the chassis frame, a stabilizing cylinder rotatably disposed on one side of the stabilizing frame, swing plates symmetrically disposed on the outer side of the stabilizing cylinder, stabilizing tubes symmetrically disposed at both ends of the two swing plates, stabilizing shafts rotatably disposed inside the two stabilizing tubes, floating wheels cooperating with the inner side of the track at both ends of the two stabilizing shafts, a stabilizing block disposed on one side of the stabilizing frame, an elastic reset component disposed between the stabilizing block and the swing plates, and an abutment frame cooperating with the middle of the toothed block rotatably disposed between the two swing plates through a limiting component.

[0015] Furthermore, the tensioning assembly includes a sliding tube slidably disposed at the front end of the chassis frame, a sliding frame at one end of the sliding tube, a rotating shaft on the sliding frame, a front guide driven wheel disposed on the rotating shaft via a bearing, a fixing plate on one side of the front end of the chassis frame, a fixing hole on the fixing plate, an adjusting rod passing through the fixing hole, a fixing round block at the front end of the adjusting rod abutting against one side of the fixing plate, and a movable sleeve plate at the rear end of the adjusting rod movably disposed via a blocking member abutting against the other side of the fixing plate, a threaded sleeve on the sliding frame, and an adjusting screw threadedly connected to the threaded sleeve on one side of the fixing round block.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: By setting up a structure in which the frame, powertrain, transmission assembly, drive wheel output shaft, drive wheel, track wheel system assembly, and tracks work together, the machine can achieve stable movement, strong grip, and uniform ground pressure in complex and harsh tillage environments. This improves the reliability, flexibility, and efficiency of the entire machine, and solves the problems of traditional wheeled tractors being unable to adapt to the small plots and complex environments of southern my country, as well as the difficulty in moving. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a tracked tractor chassis that can be equipped with a power shift device according to an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the transmission box assembly according to an embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the internal structure of the front transmission box assembly, the intermediate transmission box assembly, and the rear transmission box assembly according to an embodiment of this application.

[0020] Figure 4 This is a schematic diagram of the gear transmission of the transmission box assembly according to an embodiment of this application.

[0021] Figure 5 This is a schematic diagram of the track wheel assembly according to an embodiment of this application.

[0022] Figure 6 yes Figure 5 Schematic diagrams of structures in other directions.

[0023] Explanation of reference numerals in the attached figures: 1. Frame; 2. Powertrain; 21. Drive shaft; 22. Connecting sleeve; 3. Transmission box assembly; 31. Front transmission box assembly; 311. Front transmission box housing; 312. Front transmission main shaft; 313. Front transmission output shaft; 314. Front transmission gear set; 32. Intermediate transmission box assembly; 321. Intermediate transmission box housing; 322. Intermediate transmission shaft; 323. Intermediate transmission main shaft; 324. Intermediate shift shaft; 325. Intermediate auxiliary transmission shaft; 326. Middle 327. Intermittent transmission gear set; 328. First and third gear power shift assembly; 329. Second and fourth gear power shift assembly; 3210. Shift gear set; 3211. Clutch; 3212. Adjusting shaft; 3213. High and low gear adjustment gear; 3214. Adjusting gear; 3215. Double main shaft gear sleeve; 33. Rear transmission box assembly; 331. Rear transmission box body; 332. Rear transmission main shaft; 333. PTO output shaft; 334. Reverse gear shaft; 335. Rear linkage shaft 336. Rear linkage helical gear set; 337. Rear linkage gear set; 338. Connecting part two; 339. Rear drive main shaft three-gear sleeve; 3310. Rear drive main shaft reverse gear; 3311. Meshing sleeve; 3312. Meshing sleeve gear set; 3313. Reverse gear double gear sleeve; 4. Drive wheel output shaft; 41. Drive wheel; 5. Track wheel assembly; 51. Chassis frame; 52. Front guide driven wheel; 53. Rear guide driven wheel; 6. Sliding tube; 61 62. Sliding frame; 63. Rotating shaft; 64. Fixed plate; 65. Adjusting rod; 66. Fixed round block; 77. Adjusting screw; 88. Fixed shaft; 99. Support roller; 100. Anti-deviation round tube; 11. Fixed frame; 12. Abutment plate; 13. Stabilizing frame; 14. Stabilizing rotating drum; 15. Swing plate; 16. Stabilizing cylinder tube; 17. Stabilizing rotating shaft; 18. Floating wheel; 19. Stabilizing block; 20. Elastic reset assembly; 21. Abutment frame; 22. Track; 33. Toothed block. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0025] This application discloses a tracked tractor chassis structure capable of carrying a power shift device, referring to... Figures 1-3 In this embodiment, the chassis structure includes a frame 1, a powertrain 2, a transmission assembly 3, a drive wheel output shaft 4, drive wheels 41, a track wheel assembly 5, and tracks 9. The powertrain 2 is mounted on the frame 1 and includes a driver's control room, engine, hydraulic pump, water tank, radiator, and transmission, etc., which are mounted on the front end of the frame 1. The transmission assembly 3 is mounted on the rear side of the frame 1, and its input end is connected to the engine output end of the powertrain 2 to provide power for starting the transmission assembly 3.

[0026] Meanwhile, the drive wheel output shaft 4 is rotatably connected to the output end of the transmission box assembly 3, so that the transmission box assembly 3 drives the drive wheel output shaft 4 to rotate; there are two drive wheels 41, which are installed on both ends of the drive wheel output shaft 4. When the drive wheel output shaft 4 rotates, it can drive both drive wheels 41 to rotate at the same time.

[0027] In addition, there are two track wheel assemblies 5, which are symmetrically installed on both sides of the frame 1. There are two tracks 9, which are tensioned and wrapped around the outer sides of the two track wheel assemblies 5 respectively. The inner sides of the two tracks 9 are respectively engaged with the outer sides of the two drive wheels 41, so that the two drive wheels 41 drive the two tracks 9 to rotate on the outer side of the track wheel assembly 5, thereby enabling the track wheel assembly 5 to move effectively through the rotating tracks 9.

[0028] The structure of transmission box assembly 3 is described in detail below: Specifically, refer to Figures 1-4 In this embodiment, the transmission assembly 3 includes a front transmission assembly 31, an intermediate transmission assembly 32, and a rear transmission assembly 33. The front transmission assembly 31 is mounted at the rear end of the frame 1, and its input end is connected to the engine output end of the powertrain 2 to start the front transmission assembly 31. The intermediate transmission assembly 32 is mounted at the rear end of the front transmission assembly 31, and its output end is connected to the input end of the intermediate transmission assembly 32, so that the front transmission assembly 31 drives the intermediate transmission assembly 32 to start.

[0029] The rear transmission assembly 33 is installed at the rear end of the intermediate transmission assembly 32, and the output end of the intermediate transmission assembly 32 is connected to the input end of the rear transmission assembly 33, so that the intermediate transmission assembly 32 drives the rear transmission assembly 33 to start.

[0030] Meanwhile, the drive wheel output shaft 4 includes two output shafts, which are rotatably mounted on the two end side walls of the rear transmission box assembly 33, and the corresponding ends of the two output shafts are fixedly connected by spline sleeves. The two drive wheels 41 are respectively mounted on the ends of the two output shafts that are far apart from each other and extend out of the rear transmission box assembly 33. The output end of the rear transmission box assembly 33 is connected to one of the output shafts, so that the rear transmission box assembly 33 drives the output shaft to rotate, and the output shaft drives the other output shaft to rotate at the same time, thereby realizing that the entire drive wheel output shaft 4 drives the two drive wheels 41 to rotate simultaneously.

[0031] More specifically, refer to Figures 1-4In this embodiment, the front transmission housing assembly 31 includes a front transmission housing 311, a front transmission main shaft 312, a front transmission output shaft 313, and a front transmission gear set 314. The front transmission housing 311 is mounted at the rear end of the frame 1. The front transmission main shaft 312 is rotatably mounted inside the front transmission housing 311, with its front end extending out of the front transmission housing 311 and its rear end rotatably connected to the rear interior side of the front transmission housing 311. Simultaneously, a drive shaft 21 is connected to the engine output end of the powertrain 2. The end of the drive shaft 21 furthest from the engine is connected to the end of the front transmission main shaft 312 extending out of the front transmission housing 311 via a connecting sleeve 22, and the drive shaft 21 and the front transmission main shaft 312 are fixedly connected via the connecting sleeve 22.

[0032] In addition, the front drive output shaft 313 is rotatably mounted inside the front drive housing 311. Both the front and rear ends of the front drive output shaft 313 extend out of the front drive housing 311, and the front drive output shaft 313 is designed to be parallel to the front drive main shaft 312. Meanwhile, one end of the front drive output shaft 313 is connected to the input end of the intermediate transmission assembly 32 through the clutch 3210, and the other end of the front drive output shaft 313 is connected to the hydraulic pump on the powertrain 2.

[0033] Furthermore, the front drive gear set 314 is disposed between the front drive main shaft 312 and the front drive output shaft 313, and the front drive gear set 314 includes two front drive gears, which are respectively installed between the shaft of the front drive main shaft 312 and the shaft of the front drive output shaft 313, and the two front drive gears mesh with each other.

[0034] When the engine drives the drive shaft 21 to rotate, the drive shaft 21 drives the front drive main shaft 312 to rotate. Then, under the action of the two front drive gears meshing with each other, the front drive main shaft 312 drives the front drive output shaft 313 to rotate. Thus, the front drive output shaft 313 not only drives the intermediate transmission box assembly 32 to start through the clutch 3210, but also drives the hydraulic pump to start, thereby providing power to the intermediate transmission box assembly 32 and the hydraulic pump.

[0035] More specifically, refer to Figures 1-4In this embodiment, the intermediate transmission assembly 32 includes an intermediate transmission housing 321, an intermediate transmission shaft 322, an intermediate transmission main shaft 323, an intermediate shift shaft 324, an intermediate auxiliary transmission shaft 325, an intermediate transmission gear set 326, a first and third gear power shift component 327, a second and fourth gear power shift component 328, and a shift gear set 329. The intermediate transmission housing 321 is mounted on the rear side of the front transmission housing 311; the rear end of the intermediate transmission shaft 322 is rotatably mounted on the front side of the intermediate transmission housing 321, and the front end of the intermediate transmission shaft 322 is connected to the rear end of the front transmission output shaft 313 via a clutch 3210. When the front transmission output shaft 313 rotates, the intermediate transmission shaft 322 can be driven to rotate via the clutch 3210.

[0036] Meanwhile, the intermediate transmission main shaft 323, intermediate shift shaft 324, and intermediate auxiliary transmission shaft 325 are rotatably mounted inside the intermediate transmission housing 321. The front end of the intermediate transmission main shaft 323 is rotatably connected to the rear end of the intermediate transmission shaft 322 via a needle roller bearing. Two intermediate shift shafts 324 are provided, and the two intermediate shift shafts 324 and the intermediate auxiliary transmission shaft 325 are located on the outside of the intermediate transmission main shaft 323. The intermediate transmission gear sleeve 326 is installed at the front end of the intermediate auxiliary transmission shaft 325, between the front end of the intermediate transmission main shaft 323 and the rear end of the intermediate transmission shaft 322.

[0037] Specifically, the intermediate transmission gear assembly 326 includes a first double transmission gear sleeve, an intermediate transmission shaft gear, and a second double transmission gear sleeve. The first double transmission gear sleeve is installed at the front end of the intermediate auxiliary transmission shaft 325; the intermediate transmission shaft gear is installed at the rear end of the intermediate transmission shaft 322 and meshes with the first double transmission gear sleeve; the second double transmission gear sleeve is installed at the front end of the intermediate main transmission shaft 323 and meshes with the first double transmission gear sleeve.

[0038] The first and third gear shift components 327 are mounted on one of the intermediate shift shafts 324 to achieve power switching between first and third gear; the second and fourth gear shift components 328 are mounted on the other intermediate shift shaft 324 to achieve power switching between second and fourth gear. The shift gear set 329 is located between the first and third gear shift components 327 and the second and fourth gear shift components 328 and the intermediate transmission main shaft 323, and the shift gear set 329 cooperates with the double transmission gear sleeve.

[0039] Specifically, the shift gear set 329 includes two first- and third-gear shift gears, two second- and fourth-gear shift gears, and a main shaft shift gear sleeve. The two first- and third-gear shift gears are respectively installed at the front and rear ends of the first- and third-gear power shift component 327; the two second- and fourth-gear shift gears are respectively installed at the front and rear ends of the second- and fourth-gear power shift component 328; and the main shaft shift gear sleeve is installed on the shaft body of the intermediate drive main shaft 323. More specifically, the first- and third-gear shift gears located at the front end of the first- and third-gear power shift component 327 mesh with the second dual-drive gear sleeve, and the first- and third-gear shift gears located at the rear end of the first- and third-gear power shift component 327 mesh with the main shaft shift gear sleeve; and the second- and fourth-gear shift gears located at the front end of the second- and fourth-gear power shift component 328 mesh with the second dual-drive gear sleeve, and the second- and fourth-gear shift gears located at the rear end of the second- and fourth-gear power shift component 328 mesh with the main shaft shift gear sleeve. By shifting the first and third gear power shift components 327 and the second and fourth gear power shift components 328 left and right, the shift gear set 329 and the double transmission gear sleeve 2 can be meshed with each other, thereby achieving an effective shifting effect for the movement of the entire device.

[0040] In addition, in this embodiment, the rear end of the two intermediate shift shafts 324 and the middle end of the intermediate transmission main shaft 323 are connected to the rear transmission box assembly 33 through a high-low gear adjustment component, and the high-low gear adjustment component includes an adjustment shaft 3211, a high-low gear adjustment gear 3212, an adjustment gear 3213 and a double main shaft gear sleeve 3214. One end of the adjusting shaft 3211 is rotatably connected to the rear end of one of the intermediate shift shafts 324, and the other end extends into the interior of the rear transmission assembly 33. The end of the intermediate transmission main shaft 323 is also connected to the rear transmission assembly 33. The high and low gear adjusting gear 3212 is slidably mounted on the adjusting shaft 3211, and a high and low gear adjusting component is also installed on the power assembly 2. A toggle component is installed at the output end of the high and low gear adjusting component. The toggle component cooperates with the high and low gear adjusting gear 3212, so that the high and low gear adjusting component controls the toggle component to move back and forth, and the toggle component drives the high and low gear adjusting gear 3212 to move back and forth.

[0041] Two adjusting gears 3213 are provided, each mounted at the rear end of one of the two intermediate shift shafts 324. A double-spindle gear sleeve 3214 is rotatably mounted on the rear side of the intermediate transmission housing 321, and is fitted onto the middle end of the intermediate transmission main shaft 323, meshing with each of the two adjusting gears 3213. When the high / low gear adjusting gear 3212 moves to the rear end, it meshes with the double-spindle gear sleeve 3214, indicating low gear adjustment. When the high / low gear adjusting gear 3212 moves to the front end, it disengages from the double-spindle gear sleeve 3214, indicating high gear adjustment. When the high / low gear adjusting gear 3212 is in the middle, it is in neutral gear adjustment.

[0042] More specifically, refer to Figures 1-4 In this embodiment, the rear transmission assembly 33 includes a rear transmission housing 331, a rear linkage gear set 337, a rear transmission main shaft 332, a PTO output shaft 333, a reverse gear shaft 334, and a meshing sleeve assembly. The rear transmission housing 331 is mounted on the rear side of the intermediate transmission housing 321, and both ends of the drive wheel output shaft 4 and the rear end of the adjusting shaft 3211 are rotatably mounted inside the rear transmission housing 331. The rear linkage gear set 337 is disposed between the shaft of the drive wheel output shaft 4 and the rear end of the adjusting shaft 3211 on the high / low gear adjustment assembly, thereby driving the drive wheel output shaft 4 to rotate.

[0043] Specifically, in this embodiment, the rear linkage gear set 337 includes a rear linkage shaft 335, a rear linkage helical gear set 336, and a rear linkage gear set 337. The rear linkage shaft 335 is rotatably mounted within the rear transmission housing 331. The rear linkage helical gear set 336 is located between one end of the rear linkage shaft 335 and the rear end of the adjusting shaft 3211. The rear linkage helical gear set 336 consists of two rear linkage helical gears, which are respectively mounted on one end of the rear linkage shaft 335 and the rear end of the adjusting shaft 3211, and the two rear linkage helical gears mesh with each other.

[0044] Meanwhile, the rear linkage gear set 337 is located between the other end of the rear linkage shaft 335 and the shaft of the drive wheel output shaft 4. The rear linkage gear set 337 consists of two rear linkage gears, which are respectively installed on the end of the rear linkage shaft 335 away from the rear linkage helical gear and on the shaft of the drive wheel output shaft 4, and the two rear linkage gears mesh with each other.

[0045] When the adjusting shaft 3211 rotates, the two rear linkage helical gears mesh with each other, causing the adjusting shaft 3211 to drive the rear linkage shaft 335 to rotate. Then, under the action of the two rear linkage gears meshing with each other, the rear linkage shaft 335 drives the drive wheel output shaft 4 to rotate, so that the rotating drive wheel output shaft 4 can simultaneously rotate the two drive wheels 41.

[0046] In addition, in this embodiment, the rear drive main shaft 332, PTO output shaft 333, and reverse gear shaft 334 are rotatably installed inside the rear end of the rear drive housing 331. The front end of the rear drive main shaft 332 is connected to the end of the intermediate drive main shaft 323 through a second connector 338. The second connector 338 is a spline sleeve, which is fitted on both the front end of the rear drive main shaft 332 and the end of the intermediate drive main shaft 323. In this way, the spline sleeve fixes the intermediate drive main shaft 323 and the rear drive main shaft 332, so that the intermediate drive main shaft 323 can drive the rear drive main shaft 332 to rotate when it rotates.

[0047] Meanwhile, the engagement sleeve assembly is disposed between the rear drive main shaft 332, the PTO output shaft 333, and the reverse gear shaft 334. Through the arrangement of this engagement sleeve assembly, the PTO output shaft 333 can achieve power output in first to third gears and reverse gear. Specifically, the engagement sleeve assembly includes a rear drive main shaft three-gear sleeve 339, a rear drive main shaft reverse gear 3310, an engagement sleeve 3311, an engagement sleeve gear set 3312, and a reverse gear double-gear sleeve 3313. The rear drive main shaft three-gear sleeve 339 is installed on the front end shaft of the rear drive main shaft 332; the rear drive main shaft reverse gear 3310 is installed on the rear end shaft of the rear drive main shaft 332; the meshing sleeve 3311 is slidably installed on the PTO output shaft 333, and a gear adjustment component is also installed on the powertrain 2. The output end of the gear adjustment component is also equipped with a toggle component. The toggle component cooperates with the meshing sleeve 3311, so that the gear adjustment component controls the toggle component to move back and forth, and the toggle component drives the meshing sleeve 3311 to move back and forth.

[0048] The meshing sleeve gear set 3312 includes four meshing sleeve gears, which are evenly divided into two groups. The two groups of meshing sleeve gears are symmetrically mounted on the PTO output shaft 333. The two groups of meshing sleeve gears are located on both sides of the meshing sleeve 3311, and these meshing sleeve gears mesh with the meshing sleeve 3311 to realize the power output of the PTO output shaft 333 in first to third gear and reverse gear. Specifically, the four meshing sleeve gears are arranged from front to back as first gear, second gear, neutral, third gear, and reverse gear. The reverse gear double gear sleeve 3313 is mounted on the reverse gear shaft 334, and the reverse gear double gear sleeve 3313 meshes with the meshing sleeve 3311 and the reverse gear 3310 of the rear drive main shaft. The meshing sleeve 3311 meshes with the three gear sleeve 339 of the rear drive main shaft.

[0049] When the PTO output shaft 333 needs to output power in the first gear, the engagement sleeve 3311 is moved to the first gear position, so that the intermediate gear in the three-gear sleeve 339 of the rear transmission main shaft meshes with the second gear at the front end of the engagement sleeve gear set 3312. In this way, the rotation of the intermediate transmission main shaft 323 drives the rear transmission main shaft 332 to rotate. Then, under the action of the engagement between the intermediate gear in the three-gear sleeve 339 of the rear transmission main shaft and the second gear at the front end of the engagement sleeve gear set 3312, the rear transmission main shaft 332 drives the PTO output shaft 333 to rotate, thereby realizing the first gear power output of the PTO output shaft 333.

[0050] When the PTO output shaft 333 needs to output power in second gear, the meshing sleeve 3311 is moved to the second gear position, so that the front gear in the rear drive main shaft three-gear sleeve 339 meshes with the first gear at the front of the meshing sleeve gear set 3312. In this way, the rotation of the intermediate drive main shaft 323 drives the rear drive main shaft 332 to rotate. Then, under the action of the meshing of the front gear in the rear drive main shaft three-gear sleeve 339 with the first gear at the front of the meshing sleeve gear set 3312, the rear drive main shaft 332 drives the PTO output shaft 333 to rotate, thereby realizing the second gear power output of the PTO output shaft 333.

[0051] When the PTO output shaft 333 needs to output power in three gears, the meshing sleeve 3311 is moved to the third gear position, so that the rear gear in the three-gear sleeve 339 of the rear drive main shaft meshes with the second rear gear of the meshing sleeve gear set 3312. In this way, the rotation of the intermediate drive main shaft 323 drives the rear drive main shaft 332 to rotate. Then, under the action of the meshing of the rear gear in the three-gear sleeve 339 of the rear drive main shaft and the second rear gear of the meshing sleeve gear set 3312, the rear drive main shaft 332 drives the PTO output shaft 333 to rotate, thereby realizing the three-gear power output of the PTO output shaft 333.

[0052] When reverse gear power output is required for PTO output shaft 333, the engagement sleeve 3311 is moved to the reverse position, so that the reverse gear 3310 of the rear drive main shaft meshes with the gear at the rear end of the reverse double gear sleeve 3313, and the gear at the front end of the reverse double gear sleeve 3313 meshes with the first gear at the rear end of the engagement sleeve gear set 3312. In this way, the rotation of the intermediate drive main shaft 323 drives the rear drive main shaft 332 to rotate. Then, the reverse gear 3310 of the rear drive main shaft meshes with the gear at the rear end of the reverse double gear sleeve 3313, so that the rear drive main shaft 332 drives the reverse gear shaft 334 to rotate. Then, under the action of the gear at the front end of the reverse double gear sleeve 3313 meshing with the first gear at the rear end of the engagement sleeve gear set 3312, the reverse gear shaft 334 drives the PTO output shaft 333 to rotate, thereby realizing the reverse gear power output of PTO output shaft 333.

[0053] The structure of track wheel assembly 5 is described in detail below: Specifically, refer to Figure 1 , Figure 5 as well as Figure 6 In this embodiment, the track wheel assembly 5 includes a chassis frame 51, a tensioning assembly, a front guide driven wheel 52, a rear guide driven wheel 53, a toothed block 91, an anti-deviation device, and a floating mechanism. The chassis frame 51 is mounted on one side of the frame 1. The front guide driven wheel 52 is rotatably mounted on the front end of the chassis frame 51 via the tensioning assembly, and the front guide driven wheel 52 abuts against the inner side of the track 9. The tensioning assembly allows for adjustment of the position of the front guide driven wheel 52, thereby effectively adjusting the tension of the track 9.

[0054] Specifically, refer to Figure 5 and Figure 6 In this embodiment, the tensioning assembly includes a sliding tube 6, a sliding frame 61, a rotating shaft 62, a fixed plate 63, an adjusting rod 64, a fixed round block 65, a blocking component, a movable sleeve, a threaded sleeve, and an adjusting screw 66. A sliding cavity is provided at the front end of the chassis frame 51, and the sliding tube 6 is slidably mounted within the sliding cavity. The sliding frame 61 is mounted on the end of the sliding tube 6 that extends outside the sliding cavity. The rotating shaft 62 is mounted on the sliding frame 61, and the front guide driven wheel 52 is rotatably mounted on the rotating shaft 62 via a bearing.

[0055] Meanwhile, the fixing plate 63 is installed on the front side of the chassis frame 51, and a fixing hole is provided on the fixing plate 63, through which the adjusting rod 64 passes; the fixing block 65 is installed at the front end of the adjusting rod 64, and the fixing block 65 abuts against the front side of the fixing plate 63; the movable sleeve is fitted on the adjusting rod 64, and a blocking member is installed at the rear end of the adjusting rod 64. The blocking member is a blocking latch, which effectively blocks the movable sleeve, so that the movable sleeve is movably fitted on the adjusting rod 64, and the movable sleeve abuts against the rear side of the fixing plate 63, thereby limiting the adjusting rod 64 to be movably fixed on the fixing plate 63 by the movable sleeve and the fixing block 65.

[0056] The threaded sleeve is installed inside the sliding frame 61 to pass through the sliding frame 61; one end of the adjusting screw 66 is fixedly installed on the side of the fixed round block 65 away from the adjusting rod 64, and the adjusting screw 66 is threadedly connected to the threaded sleeve, so that the adjusting screw 66 is screwed into the inside of the threaded sleeve.

[0057] When the adjusting rod 64 is rotated, the adjusting rod 64 drives the adjusting screw 66 to rotate inside the threaded sleeve. Due to the sliding fit between the sliding tube 6 and the chassis frame 51, the sliding frame 61 is limited, thereby causing the sliding frame 61 to drive the front guide driven wheel 52 on the rotating shaft 62 to adjust back and forth, thereby enabling the front guide driven wheel 52 to adjust the tension of the track 9.

[0058] Additionally, refer to Figure 5 and Figure 6 In this embodiment, the rear guide driven wheel 53 is rotatably mounted on the rear end of the chassis frame 51. The rear guide driven wheel 53 abuts against the inner side of the track 9, and the rear guide driven wheel 53 and the front guide driven wheel 52 are located on the same horizontal plane. The drive wheel 41 is located above the rear guide driven wheel 53 and the front guide driven wheel 52, so as to abut against three positions on the inner side of the track 9 respectively, thereby making the track 9 have a triangular structure.

[0059] Furthermore, in this embodiment, several toothed blocks 91 are provided, and these toothed blocks 91 are sequentially installed at the middle of the inner side of the track 9. The middle grooves of these toothed blocks 91 respectively cooperate with the front guide driven wheel 52, the rear guide driven wheel 53, and the drive wheel 41 to achieve a certain guiding and limiting effect. In addition, several long racks and several short racks are also installed laterally on the outer side of the track 9. These long racks and short racks are arranged alternately, so that dirt and other debris can slide between the long racks and short racks, preventing dirt and other debris from accumulating on the surface of the track 9.

[0060] Secondly, in this embodiment, two anti-deviation devices are provided, symmetrically installed at both ends of the chassis frame 51 on the side away from the frame 1. These two devices abut against the inner side of the track 9 to effectively prevent deviation and thus prevent derailment. Simultaneously, a floating mechanism is located in the middle of the side of the chassis frame 51 away from the frame 1, positioned between the two anti-deviation devices. This floating mechanism abuts against the inner side of the track 9, allowing the track 9 to move smoothly on uneven ground.

[0061] The structure of the two anti-deviation devices is described in detail below: Specifically, refer to Figure 5 and Figure 6 In this embodiment, one of the anti-deviation devices includes a fixed shaft 7, a support roller 71, an anti-deviation tube 72, a fixing frame 73, and an abutment plate 74. Two fixed shafts 7 are provided, symmetrically mounted on one side of the chassis frame 51, and both fixed shafts 7 are located in front of the rear guide driven wheel 53. Two support rollers 71 are provided, each rotatably mounted on one of the two fixed shafts 7 via bearings. The middle portion of each support roller 71 engages with a toothed block 91, and the outer ends of each support roller 71 abut against the inner side of the track 9. The anti-deviation tube 72 is placed between the middle portions of the two support rollers 71 and the middle portions of the toothed blocks 91, and both ends of the anti-deviation tube 72 are curved upwards.

[0062] Meanwhile, the fixing frame 73 is installed on one side of the chassis frame 51, and the fixing frame 73 is located between the two support rollers 71; the abutment plate 74 is installed on the side of the fixing frame 73 away from the chassis frame 51 by two locking parts, both of which are bolts and nuts, to achieve a stable installation of the abutment plate 74, and the bottom of the abutment plate 74 abuts against the middle of the anti-deviation round tube 72, so that the abutment plate 74 effectively blocks and limits the anti-deviation round tube 72; in this way, the structure of the fixed shaft 7, support rollers 71, anti-deviation round tube 72, fixing frame 73 and abutment plate 74 working together can effectively prevent the track 9 from derailing.

[0063] In this embodiment, the other anti-deviation device is located behind the front guide driven wheel 52. The structure of this anti-deviation device is different from that of the anti-deviation device described above. This anti-deviation device lacks a fixed shaft 7 and a support roller 71. It only uses a support roller 71 and abutment plate 74 to limit the anti-deviation circular tube 72 in the middle of these toothed blocks 91. It can also effectively prevent the track 9 from derailing.

[0064] The structure of the floating mechanism is described in detail below: Specifically, refer to Figure 5 and Figure 6 In this embodiment, the floating mechanism includes a stabilizing frame 8, a stabilizing rotating cylinder 81, a swing plate 82, a stabilizing tube 83, a stabilizing rotating shaft 84, a floating wheel 85, a stabilizing block 86, an elastic reset assembly 87, and an abutment frame 88. The stabilizing frame 8 is mounted on one side of the chassis frame 51; the stabilizing rotating cylinder 81 is rotatably mounted on one side of the stabilizing frame 8; two swing plates 82 are provided, symmetrically mounted at their middle portions on the outer sides of the stabilizing rotating cylinder 81, allowing the two swing plates 82 to swing left and right via the stabilizing rotating cylinder 81.

[0065] Meanwhile, there are two stabilizing cylinders 83, which are symmetrically installed between the two ends of the two swing plates 82; there are two stabilizing shafts 84, which are rotatably installed inside the two stabilizing cylinders 83 respectively; there are four floating wheels 85, which are evenly divided into two groups, with each group of floating wheels 85 installed on both ends of the stabilizing shaft 84, and the bottom of these floating wheels 85 abutting against the inner side of the track 9.

[0066] The stabilizing block 86 is installed on the top of one side of the stabilizing frame 8; the elastic reset component 87 is disposed between the stabilizing block 86 and the swing plate 82 near the stabilizing frame 8 to achieve elastic traction of the swing plate 82. The abutment frame 88 is rotatably disposed between the two swing plates 82 via a limiting component, and the abutment frame 88 cooperates with the middle of the toothed blocks 91. Specifically, the limiting component includes rotating sleeves symmetrically installed on both sides of the abutment frame 88, and limiting rods are symmetrically disposed between the two swing plates 82. The abutment frame 88 is rotatably sleeved on the two limiting rods via two rotating sleeves, thus enabling the track 9 to prevent deviation even when traveling on uneven ground by setting the abutment frame 88.

[0067] More specifically, in this embodiment, the elastic reset assembly 87 includes a fixing nut, a fixing bolt, and a spring. Holes are provided on both the stabilizing block 86 and the swing plate 82. Two fixing nuts are provided, each mounted on the stabilizing block 86 and the swing plate 82 respectively, and each fixing nut communicates with one of the two holes. Two fixing bolts are provided, each threadedly connected to one of the two fixing nuts, and each fixing bolt engages with one of the two holes. When the fixing bolt is turned, it extends from the fixing nut into the hole, penetrating the stabilizing block 86 or the swing plate 82, thereby securing the fixing bolt firmly in place.

[0068] The two ends of the spring are respectively installed on the outside of two fixing bolts, so that the spring can be securely installed by the two fixing bolts. When the track 9 travels on a flat road surface, the spring is in normal state, so that the floating wheels 85 are on the same plane. When the track 9 travels on an uneven road surface, under the rotation of the stabilizing cylinder 81, the front end or rear end of the floating wheels 85 is raised, so that the track 9 can travel smoothly on uneven ground. Through the design of the spring, the structure formed by the combination of the swing plate 82, the stabilizing cylinder 83, the stabilizing shaft 84 and the floating wheels 85 can be effectively elastically reset.

[0069] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A tracked tractor chassis structure capable of mounting a power shift device, characterized in that: The system includes a frame (1), on which a power assembly (2) is mounted. A transmission box assembly (3) is also mounted on the rear side of the frame (1). The input end of the transmission box assembly (3) is connected to the power assembly (2). The output end of the transmission box assembly (3) is connected to a drive wheel output shaft (4). Both ends of the drive wheel output shaft (4) are equipped with drive wheels (41). Track wheel assemblies (5) are symmetrically arranged on both sides of the frame (1). Tracks (9) are tensioned and wound around the two track wheel assemblies (5). The two tracks (9) are respectively engaged with the two drive wheels (41).

2. The tracked tractor chassis structure capable of carrying a power shift device according to claim 1, characterized in that: The transmission assembly (3) includes a front transmission assembly (31), an intermediate transmission assembly (32), and a rear transmission assembly (33); the input end of the front transmission assembly (31) is connected to the output end of the powertrain (2), the output end of the front transmission assembly (31) is connected to the input end of the intermediate transmission assembly (32), the output end of the intermediate transmission assembly (32) is connected to the input end of the rear transmission assembly (33), the drive wheel output shaft (4) is rotatably disposed in the rear transmission assembly (33), and the output end of the rear transmission assembly (33) is connected to the drive wheel output shaft (4).

3. The tracked tractor chassis structure capable of carrying a power shift device according to claim 2, characterized in that: The front transmission housing assembly (31) includes a front transmission housing (311) mounted on the frame (1). The front transmission housing (311) is rotatably equipped with a front transmission main shaft (312) and a front transmission output shaft (313). A front transmission gear set (314) is provided between the front transmission main shaft (312) and the front transmission output shaft (313). The engine output end of the powertrain (2) is connected to a drive shaft (21). One end of the drive shaft (21) is connected to one end of the front transmission main shaft (312) through a connecting sleeve (22). One end of the front transmission output shaft (313) is connected to the input end of the intermediate transmission housing assembly (32) through a clutch (3210), and the other end is connected to a hydraulic pump on the powertrain (2).

4. The tracked tractor chassis structure capable of carrying a power shift device according to claim 3, characterized in that: The intermediate transmission box assembly (32) includes an intermediate transmission box (321) disposed on one side of the front transmission box (311). An intermediate transmission shaft (322) is rotatably disposed on the front side of the intermediate transmission box (321). The front end of the intermediate transmission shaft (322) is connected to the rear end of the front transmission output shaft (313) through the clutch (3210). An intermediate transmission main shaft (323), two intermediate shift shafts (324), and an intermediate auxiliary transmission shaft (325) are also rotatably disposed inside the intermediate transmission box (321). The front end of the intermediate transmission main shaft (323) is rotatably connected to the rear end of the intermediate transmission shaft (322), and the front end of the intermediate auxiliary transmission shaft (325) is simultaneously connected to the front end of the intermediate transmission main shaft (323). An intermediate transmission gear set (326) is provided between the rear end of the intermediate transmission shaft (322) and the intermediate transmission shaft (322). One intermediate shift shaft (324) is provided with a first and third gear power shift component (327), and the other intermediate shift shaft (324) is provided with a second and fourth gear power shift component (328). The first and third gear power shift components (327) and the second and fourth gear power shift components (328) are simultaneously provided with a shift gear set (329) between the intermediate transmission main shaft (323) and the intermediate transmission main shaft (324). The rear ends of the two intermediate shift shafts (324) and the middle end of the intermediate transmission main shaft (323) are connected to the rear transmission box assembly (33) through a high and low gear adjustment component. The end of the intermediate transmission main shaft (323) is connected to the rear transmission box assembly (33).

5. The tracked tractor chassis structure capable of carrying a power shift device according to claim 4, characterized in that: The rear transmission box assembly (33) includes a rear transmission box (331) disposed on one side of the intermediate transmission box (321). The drive wheel output shaft (4) is rotatably disposed inside the rear transmission box (331). A rear linkage gear set (337) is disposed between the shaft of the drive wheel output shaft (4) and the output end of the high and low gear adjustment component. A rear transmission main shaft (332), a PTO output shaft (333), and a reverse gear shaft (334) are also rotatably disposed inside the rear end of the rear transmission box (331). The front end of the rear transmission main shaft (332) is connected to the end of the intermediate transmission main shaft (323) through a connecting member two (338). A meshing sleeve (3311) assembly is disposed between the rear transmission main shaft (332), the PTO output shaft (333), and the reverse gear shaft (334).

6. The tracked tractor chassis structure capable of carrying a power shift device according to claim 5, characterized in that: The rear linkage gear set (337) includes a rear linkage shaft (335) disposed in the rear transmission housing (331). A rear linkage helical gear set (336) is disposed between one end of the rear linkage shaft (335) and the high / low gear adjustment component. A rear linkage gear set (337) is disposed between the other end of the rear linkage shaft (335) and the shaft of the drive wheel output shaft (4).

7. The tracked tractor chassis structure capable of carrying a power shift device according to claim 1, characterized in that: The track wheel assembly (5) includes a chassis frame (51) disposed on one side of the frame (1). A front guide driven wheel (52) is rotatably disposed at the front end of the chassis frame (51) via a tensioning assembly. A rear guide driven wheel (53) is rotatably disposed at the rear end of the chassis frame (51). A plurality of toothed blocks (91) are disposed on the inner side of the track (9). The plurality of toothed blocks (91) respectively cooperate with the front guide driven wheel (52), the rear guide driven wheel (53) and the drive wheel (41). A plurality of anti-deviation devices that cooperate with the inner side of the track (9) are symmetrically disposed at both ends of one side of the chassis frame (51). A floating mechanism that cooperates with the inner side of the track (9) is disposed in the middle of the chassis frame (51).

8. The tracked tractor chassis structure capable of carrying a power shift device according to claim 7, characterized in that: The anti-deviation device includes fixed shafts (7) symmetrically arranged on one side of the chassis frame (51). Each of the two fixed shafts (7) is provided with a support roller (71) rotatably mounted on a bearing. The two support rollers (71) abut against the inner side of the track (9). An anti-deviation tube (72) is provided between the middle part of the two support rollers (71) and the middle part of a plurality of toothed blocks (91). A fixed frame (73) is also provided on one side of the chassis frame (51). An abutment plate (74) is provided on one side of the fixed frame (73) through a plurality of locking parts. The abutment plate (74) abuts against the anti-deviation tube (72).

9. A tracked tractor chassis structure capable of carrying a power shift device according to claim 7, characterized in that: The floating mechanism includes a stabilizing frame (8) disposed on one side of the chassis frame (51). A stabilizing rotating cylinder (81) is rotatably disposed on one side of the stabilizing frame (8). Swing plates (82) are symmetrically disposed on the outer side of the stabilizing rotating cylinder (81). Stabilizing tubes (83) are symmetrically disposed at both ends of the two swing plates (82). Stabilizing shafts (84) are rotatably disposed inside the two stabilizing tubes (83). Floating wheels (85) that cooperate with the inner side of the track (9) are disposed at both ends of the two stabilizing shafts (84). A stabilizing block (86) is also disposed on one side of the stabilizing frame (8). An elastic reset component (87) is disposed between the stabilizing block (86) and the swing plate (82). An abutment frame (88) that cooperates with the middle part of the toothed block (91) is rotatably disposed between the two swing plates (82) through a limiting component.

10. A tracked tractor chassis structure capable of carrying a power shift device according to claim 7, characterized in that: The tensioning assembly includes a sliding tube (6) slidably disposed at the front end of the chassis frame (51). A sliding frame (61) is provided at one end of the sliding tube (6). A rotating shaft (62) is provided on the sliding frame (61). The front guide driven wheel (52) is disposed on the rotating shaft (62) through a bearing. A fixing plate (63) is provided on one side of the front end of the chassis frame (51). A fixing hole is provided on the fixing plate (63). An adjusting rod (64) is inserted through the fixing hole. A fixing round block (65) is provided at the front end of the adjusting rod (64) and abuts against one side of the fixing plate (63). A movable sleeve plate is movably sleeved on the rear end of the adjusting rod (64) through a blocking member and abuts against the other side of the fixing plate (63). A threaded sleeve is provided on the sliding frame (61). An adjusting screw (66) is provided on one side of the fixing round block (65) and threadedly connected to the threaded sleeve.

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