24 +12 gear variable transmission system and tractor

Abstract

The utility model relates to a 24 + 12 gear variable transmission system and a tractor, which comprise a shuttle type gear shifting device, a creeper gear speed changing device, a main speed changing device and an auxiliary speed changing device, the shuttle type gear shifting device, the main speed changing device and the auxiliary speed changing device are sequentially in transmission connection, and the creeper gear speed changing device is in transmission connection with the shuttle type gear shifting device. The utility model has the beneficial effects that the corresponding speed change device is operated through the control mechanism to realize quick gear shifting and speed change, the structure is compact, the distribution is reasonable, the defect that the creeper gear speed of the existing small and medium horsepower tractor is poor in matching with a machine tool is overcome, and a variable speed transmission system with 24 + 12 gears is provided so as to be suitable for various working conditions; the use is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle speed change, in particular to a 24+12 gear speed change transmission system and a tractor. Technical Background

[0002] Tractors are multi-purpose walking machines composed of engines, chassis, electrical systems, etc., mainly used for traction and transportation. The current small and medium horsepower tractors lack a crawling gear with a suitable speed and have few gear settings, which cannot meet the needs of different agricultural operations.

[0003] Patent No. 201010571433.4, named "24+12-speed tractor transmission box", the transmission box designed by this invention patent is equipped with a main transmission mechanism, a creeper gear mechanism, a sub-speed transmission mechanism, and a field and road conversion mechanism in sequence, which can be regarded as a three-stage gear transmission structure connected in sequence. The number of gear pairs is 3, 2, and 5 in sequence. The number of gear pairs in each section is unevenly distributed and the structure is unreasonable. At the same time, when the transmission box designed by this invention patent is used for field operations, it is necessary to toggle the two joysticks of the main transmission and the sub-speed transmission to switch the four agronomic gears. The transmission box is not simple to operate in actual operation and has high requirements for the driver's operation.

[0004] Patent No. 202120453537.9 is named "A 32+32 speed transmission system and tractor". The creeper gear transmission device in this utility model includes 2 planetary gear carriers, 6 planetary gears, 6 planetary gear shafts, 2 sun gears and 2 ring gears. The structure is complex. If the speed ratio needs to be increased, the planetary carrier needs to be enlarged, that is, the overall structural size needs to be increased. Therefore, it is more suitable for large tractors with a model of more than 200 horsepower, and cannot cover the use needs of tractors with small and medium horsepower. Summary of the invention

[0005] The purpose of the utility model is to provide a 24+12 gear speed transmission system and a tractor, which have a compact structure and a reasonable distribution. The corresponding speed change device is operated through an operating mechanism to realize fast gear shifting, which not only makes up for the defect of the current existing technology that small horsepower lacks a low-speed crawling gear, but also provides a 24+12 gear speed transmission system, which is suitable for a variety of working conditions and is easy to use.

[0006] The utility model solves the above-mentioned technical problems with the following technical solutions: a 24+12-speed transmission system, comprising a shuttle-type shifting device, a crawler gear shifting device, a main speed shifting device, and an auxiliary speed shifting device, wherein the shuttle-type shifting device, the main speed shifting device, and the auxiliary speed shifting device are sequentially connected in transmission, and the crawler gear shifting device is connected in transmission with the shuttle-type shifting device.

[0007] Furthermore, the shuttle shift device includes a shuttle shift input shaft and a shuttle shift output shaft, the shuttle shift input shaft has a coaxial sliding sleeve with a forward gear driving gear, and the forward gear driving gear rotates with the shuttle shift input shaft; the shuttle shift output shaft is installed on one side of the shuttle shift input shaft in parallel and rotationally, and one end of the shuttle shift output shaft has a coaxial sliding sleeve with a forward gear double gear, and the forward gear double gear rotates with the shuttle shift output shaft; the forward gear driving gear slides to engage or disengage with the first stage gear of the forward gear double gear.

[0008] Furthermore, a reverse gear driving gear is coaxially provided on the shuttle-type shift input shaft and the reverse gear driving gear rotates with the shuttle-type shift input shaft; a reverse gear idler shaft rotating in parallel is provided between the shuttle-type shift input shaft and the shuttle-type shift output shaft, and a reverse gear idler is coaxially provided on the reverse gear idler shaft; a reverse gear driven gear is coaxially provided on the shuttle-type shift output shaft and the reverse gear driven gear is located on the same side of the forward gear driving gear and the forward gear double gear, and the reverse gear driven gear rotates with the shuttle-type shift output shaft; the reverse gear driving gear slides to engage with or disengage from the reverse gear idler, and the reverse gear idler slides to engage with or disengage from the reverse gear driven gear.

[0009] Furthermore, the crawler gear transmission device includes a crawler gear double gear and a crawler gear driven gear, the second stage gear in the forward gear double gear is meshed with the first stage gear in the crawler gear double gear, and the second stage gear in the crawler gear double gear is meshed with the crawler gear driven gear.

[0010] Further, the main transmission device includes a constant mesh driving gear, a main transmission input gear shaft, a main transmission output shaft, a plurality of main transmission driving gears and a plurality of main transmission passive gears corresponding to and meshing with the plurality of the main transmission driving gears one by one; the constant mesh driving gear is coaxially slidably sleeved on the other end of the shuttle-type shift output shaft and rotates with the shuttle-type shift output shaft; the main transmission output shaft is coaxially mounted on one end of the shuttle-type shift output shaft close to the constant mesh driving gear and rotates around its own axial direction; a plurality of the main transmission passive gears are coaxially slidably sleeved on the main transmission output shaft at intervals and rotate with the main transmission output shaft; the main transmission input shaft is coaxially mounted on one end of the shuttle-type shift input shaft close to the main transmission output shaft, and the main transmission input shaft meshes with the constant mesh driving gears; a plurality of the main transmission driving gears are coaxially slidably sleeved on the main transmission input shaft at intervals and rotate with the main transmission input shaft.

[0011] Further, the auxiliary transmission device includes an auxiliary transmission input gear shaft, a mid-range driving gear, a low-range driven gear, a mid-range driven gear, and an auxiliary transmission output gear shaft; the auxiliary transmission input gear shaft is coaxially mounted on the end of the main transmission input shaft away from the shuttle-type shift input shaft and rotates around its own axial direction, the auxiliary transmission input gear shaft is correspondingly meshed with the main transmission output shaft, and the mid-range driving gear is coaxially slidably sleeved on the auxiliary transmission input gear shaft; the auxiliary transmission output gear shaft is parallelly mounted on one side of the auxiliary transmission input gear shaft, the low-range driven gear and the mid-range driven gear are coaxially slidably sleeved on the auxiliary transmission output gear shaft at intervals, and rotate with the auxiliary transmission output gear shaft; the mid-range driven gear is meshed with the mid-range driving gear, and the mid-range driven gear is correspondingly meshed with the auxiliary transmission input gear shaft.

[0012] The utility model also relates to a tractor, comprising a machine body and the transmission system as described above, wherein the transmission system is fixedly mounted on the machine body.

[0013] The advantages of the utility model are as follows:

[0014] 1. When adopting this scheme, when shifting gears, the forward gear driving gear is engaged or separated with the first gear of the forward gear double gear by the operating mechanism, so as to realize fast forward gear shifting.

[0015] 2. When adopting this scheme, when shifting gears, the reverse gear driving gear and the reverse gear idler gear and the reverse gear idler gear and the reverse gear driven gear are engaged or separated by the operating mechanism, so as to realize rapid reverse gear shifting.

[0016] 3. When this solution is adopted, when shifting gears, the forward gear double gear drives the crawler gear double gear to rotate, so that the crawler gear double gear drives the crawler gear passive gear to rotate, thereby achieving effective speed change.

[0017] 4. When adopting this solution, when shifting gears, the operating mechanism is used to move any main speed driven gear and the corresponding main speed driving gear, thereby realizing fast main speed shifting.

[0018] 5. When adopting this solution, when shifting gears, the operating mechanism is used to move any auxiliary speed driven gear and the corresponding auxiliary speed driving gear to achieve rapid auxiliary speed shifting.

[0019] 6. The transmission system designed in the utility model is provided with a shuttle shift device, a crawler gear transmission device, a main transmission device, and an auxiliary transmission device in sequence, wherein the shuttle shift device and the crawler gear transmission device are regarded as a group of gear transmission structures, and the transmission system as a whole is a three-stage gear transmission structure that is sequentially connected, and the number of gear pairs is 4, 5, and 3 in sequence. Obviously, the number of gear pairs in each stage of the utility model is more evenly and reasonably distributed.

[0020] 7. When the transmission system designed by the utility model is used for field operations, switching between four agronomic gears only requires operating one joystick of the main transmission. Obviously, the transmission system designed by the utility model is simpler to operate during actual operations and has lower operating requirements for the driver.

[0021] 8. The crawler gear of the utility model uses only two stages of gears for deceleration, has a compact structure, and has a low manufacturing cost, thus meeting the needs of small and medium horsepower tractors for crawler gears.

[0022] 9. The utility model has a compact structure, saves installation space, realizes multi-gear shifting of the tractor, is applicable to a wider range of working conditions and has a wider application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the utility model;

[0024] In the figure, the components represented by the reference numerals are as follows:

[0025] 1. Shuttle shift device, 2. Crawler gear shift device, 3. Main gear shift device, 4. Auxiliary gear shift device, 5. Shuttle shift input shaft, 6. Reverse gear driving gear, 7. Forward gear driving gear, 8. Reverse gear idler, 9. Reverse gear idler shaft, 10. Shuttle shift output shaft, 11. Reverse gear driven gear, 12. Forward gear double gear, 13. Crawler gear double gear, 14. Crawler gear driven gear, 15. Constant mesh driving gear, 16. Main gear input gear shaft , 17, first gear driving gear, 18, second gear driving gear, 19, third gear driving gear, 20, fourth gear driving gear, 21, first gear passive gear, 22, second gear passive gear, 23, third gear passive gear, 24, main speed change output shaft, 25, fourth gear passive gear, 26, auxiliary speed change input gear shaft, 27, middle gear driving gear, 28, low gear passive gear, 29, middle gear passive gear, 30, auxiliary speed change output gear shaft, 31, bridge box, 32, rear axle box. DETAILED DESCRIPTION

[0026] The principles and features of the utility model are described below in conjunction with the accompanying drawings. The examples given are only used to explain the utility model and are not used to limit the scope of the utility model.

[0027] like Figure 1As shown, the utility model provides a 24+12 gear speed transmission system, including a shuttle shift device 1, a crawler gear speed transmission device 2, a main speed transmission device 3 and an auxiliary speed transmission device 4; the shuttle shift device 1, the main speed transmission device 3 and the auxiliary speed transmission device 4 are sequentially connected in transmission, and the crawler gear speed transmission device 2 is connected in transmission with the shuttle shift device 1; when shifting gears, the corresponding speed transmission device is operated through the operating mechanism to realize fast shifting; the utility model has a compact structure and reasonable distribution, which not only makes up for the defect of the current existing technology that small horsepower lacks a low-speed crawling gear, but also provides a 24+12 gear speed transmission system, which is suitable for a variety of working conditions and is easy to use.

[0028] In addition, the utility model also includes a bridge box 31 and a rear axle box 32, which are fixedly installed on the chassis of the vehicle in sequence, the shuttle shift device 1 and the crawler gear transmission device 2 are located in the bridge box 31, and the main transmission device 3 and the auxiliary transmission device 4 are located in the rear axle box 32.

[0029] (I) Example of transmission route in forward gear without crawler device attached:

[0030] 1. First forward gear (high gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → first gear driving gear 17 → first gear driven gear 21 → main speed output shaft 24 → auxiliary speed output gear shaft 30

[0031] 2. Second gear forward (high gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → second gear driving gear 18 → second gear driven gear 22 → main speed output shaft 24 → auxiliary speed output gear shaft 30

[0032] 3. Third gear forward (high gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → third gear driving gear 19 → third gear driven gear 23 → main speed output shaft 24 → auxiliary speed output gear shaft 30

[0033] 4. Fourth gear forward (high gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → fourth gear driving gear 20 → fourth gear driven gear 25 → main speed output shaft 24 → auxiliary speed output gear shaft 30

[0034] 5. First forward gear (mid-gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → first gear driving gear 17 → first gear driven gear 21 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → mid-gear driving gear 27 → mid-gear driven gear 29 → auxiliary speed output gear shaft 30

[0035] 6. Second gear forward (mid-gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → second gear driving gear 18 → second gear driven gear 22 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → mid-gear driving gear 27 → mid-gear driven gear 29 → auxiliary speed output gear shaft 30

[0036] 7. Third gear forward (middle gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → third gear driving gear 19 → third gear driven gear 23 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → middle gear driving gear 27 → middle gear driven gear 29 → auxiliary speed output gear shaft 30

[0037] 8. Fourth gear forward (middle gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → fourth gear driving gear 20 → fourth gear driven gear 25 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → middle gear driving gear 27 → middle gear driven gear 29 → auxiliary speed output gear shaft 30

[0038] 9. First forward gear (low gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → first gear driving gear 17 → first gear driven gear 21 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → low gear driven gear 28 → auxiliary speed output gear shaft 30

[0039] 10. Second gear forward (low gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → second gear driving gear 18 → second gear driven gear 22 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → low gear driven gear 28 → auxiliary speed output gear shaft 30

[0040] 11. Third gear forward (low gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → third gear driving gear 19 → third gear driven gear 23 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → low gear driven gear 28 → auxiliary speed output gear shaft 30

[0041] 12. Fourth gear forward (low gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → fourth gear driving gear 20 → fourth gear driven gear 25 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → low gear driven gear 28 → auxiliary speed output gear shaft 30

[0042] (II) Example of transmission route for forward gear coupled with crawler device:

[0043] 1. First forward gear (high gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → crawler gear double gear 13 → crawler gear passive gear 14 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → first gear driving gear 17 → first gear passive gear 21 → main speed output shaft 24 → auxiliary speed output gear shaft 30

[0044] 2. Second gear forward (high gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → crawler gear double gear 13 → crawler gear passive gear 14 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → second gear driving gear 18 → second gear passive gear 22 → main speed output shaft 24 → auxiliary speed output gear shaft 30

[0045] 3. Third gear forward (high gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → crawler gear double gear 13 → crawler gear passive gear 14 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → third gear driving gear 19 → third gear passive gear 23 → main speed output shaft 24 → auxiliary speed output gear shaft 30

[0046] 4. Fourth gear forward (high gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → crawler gear double gear 13 → crawler gear passive gear 14 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → fourth gear driving gear 20 → fourth gear passive gear 25 → main speed output shaft 24 → auxiliary speed output gear shaft 30

[0047] 5. First forward gear (mid-gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear duplex gear 12 → crawler gear duplex gear 13 → crawler gear passive gear 14 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → first gear driving gear 17 → first gear passive gear 21 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → mid-gear driving gear 27 → mid-gear passive gear 29 → auxiliary speed output gear shaft 30

[0048] 6. Second gear forward (mid-gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear duplex gear 12 → crawler gear duplex gear 13 → crawler gear passive gear 14 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → second gear driving gear 18 → second gear passive gear 22 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → mid-gear driving gear 27 → mid-gear passive gear 29 → auxiliary speed output gear shaft 30

[0049] 7. Third gear forward (middle gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → creeper gear double gear 13 → creeper gear passive gear 14 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → third gear driving gear 19 → third gear passive gear 23 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → middle gear driving gear 27 → middle gear passive gear 29 → auxiliary speed output gear shaft 30

[0050] 8. Fourth gear forward (middle gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → creeper gear double gear 13 → creeper gear passive gear 14 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → fourth gear driving gear 20 → fourth gear passive gear 25 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → middle gear driving gear 27 → middle gear passive gear 29 → auxiliary speed output gear shaft 30

[0051] 9. First forward gear (low gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → crawler gear double gear 13 → crawler gear passive gear 14 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → first gear driving gear 17 → first gear passive gear 21 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → low gear passive gear 28 → auxiliary speed output gear shaft 30

[0052] 10. Second gear forward (low gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → crawler gear double gear 13 → crawler gear passive gear 14 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → second gear driving gear 18 → second gear passive gear 22 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → low gear passive gear 28 → auxiliary speed output gear shaft 30

[0053] 11. Third gear forward (low gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → crawler gear double gear 13 → crawler gear passive gear 14 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → third gear driving gear 19 → third gear passive gear 23 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → low gear passive gear 28 → auxiliary speed output gear shaft 30

[0054] 12. Fourth gear forward (low gear): shuttle shift input shaft 5 → forward gear driving gear 7 → forward gear double gear 12 → creeper gear double gear 13 → creeper gear passive gear 14 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → fourth gear driving gear 20 → fourth gear passive gear 25 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → low gear passive gear 28 → auxiliary speed output gear shaft 30

[0055] (III) Example of reverse gear transmission route:

[0056] 1. First forward gear (high gear): shuttle shift input shaft 5 → reverse gear driving gear 6 → reverse gear idler 8 → reverse gear passive gear 11 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → first gear driving gear 17 → first gear passive gear 21 → main speed output shaft 24 → auxiliary speed output gear shaft 30

[0057] 2. Second gear forward (high gear): shuttle shift input shaft 5 → reverse gear driving gear 6 → reverse gear idler 8 → reverse gear passive gear 11 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → second gear driving gear 18 → second gear passive gear 22 → main speed output shaft 24 → auxiliary speed output gear shaft 30

[0058] 3. Third gear forward (high gear): shuttle shift input shaft 5 → reverse gear driving gear 6 → reverse gear idler 8 → reverse gear passive gear 11 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → third gear driving gear 19 → third gear passive gear 23 → main speed output shaft 24 → auxiliary speed output gear shaft 30

[0059] 4. Fourth gear forward (high gear): shuttle shift input shaft 5 → reverse gear driving gear 6 → reverse gear idler 8 → reverse gear passive gear 11 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → fourth gear driving gear 20 → fourth gear passive gear 25 → main speed output shaft 24 → auxiliary speed output gear shaft 30

[0060] 5. First forward gear (mid-gear): shuttle shift input shaft 5 → reverse gear driving gear 6 → reverse gear idler 8 → reverse gear passive gear 11 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → first gear driving gear 17 → first gear passive gear 21 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → mid-gear driving gear 27 → mid-gear passive gear 29 → auxiliary speed output gear shaft 30

[0061] 6. Second gear forward (mid-gear): shuttle shift input shaft 5 → reverse gear driving gear 6 → reverse gear idler 8 → reverse gear passive gear 11 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → second gear driving gear 18 → second gear passive gear 22 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → mid-gear driving gear 27 → mid-gear passive gear 29 → auxiliary speed output gear shaft 30

[0062] 7. Third gear forward (mid-gear): shuttle shift input shaft 5 → reverse gear driving gear 6 → reverse gear idler 8 → reverse gear passive gear 11 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → third gear driving gear 19 → third gear passive gear 23 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → mid-gear driving gear 27 → mid-gear passive gear 29 → auxiliary speed output gear shaft 30

[0063] 8. Fourth forward gear (mid-gear): shuttle shift input shaft 5 → reverse gear driving gear 6 → reverse gear idler 8 → reverse gear passive gear 11 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → fourth gear driving gear 20 → fourth gear passive gear 25 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → mid-gear driving gear 27 → mid-gear passive gear 29 → auxiliary speed output gear shaft 30

[0064] 9. First forward gear (low gear): shuttle shift input shaft 5 → reverse gear driving gear 6 → reverse gear idler 8 → reverse gear passive gear 11 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → first gear driving gear 17 → first gear passive gear 21 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → low gear passive gear 28 → auxiliary speed output gear shaft 30

[0065] 10. Second gear forward (low gear): shuttle shift input shaft 5 → reverse gear driving gear 6 → reverse gear idler 8 → reverse gear passive gear 11 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → second gear driving gear 18 → second gear passive gear 22 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → low gear passive gear 28 → auxiliary speed output gear shaft 30

[0066] 11. Third forward gear (low gear): shuttle shift input shaft 5 → reverse gear driving gear 6 → reverse gear idler 8 → reverse gear passive gear 11 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → third gear driving gear 19 → third gear passive gear 23 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → low gear passive gear 28 → auxiliary speed output gear shaft 30

[0067] 12. Fourth forward gear (low gear): shuttle shift input shaft 5 → reverse gear driving gear 6 → reverse gear idler gear 8 → reverse gear driven gear 11 → shuttle shift output shaft 10 → constant mesh driving gear 15 → main speed input gear shaft 16 → fourth gear driving gear 20 → fourth gear driven gear 25 → main speed output shaft 24 → auxiliary speed input gear shaft 26 → low gear driven gear 28 → auxiliary speed output gear shaft 30.

Claims

1. A 24+12 gear transmission system, comprising a shuttle gear shift device (1), a crawler gear gear shift device (2), a main gear shift device (3), and an auxiliary gear shift device (4), characterized in that: The shuttle shift device (1), the main transmission device (3) and the auxiliary transmission device (4) are sequentially connected in transmission, and the crawler gear transmission device (2) is connected in transmission to the shuttle shift device (1).

2. A 24+12 gear transmission system according to claim 1, characterized in that: The shuttle shift device (1) comprises a shuttle shift input shaft (5) and a shuttle shift output shaft (10); a forward gear driving gear (7) is coaxially provided on the shuttle shift input shaft (5), and the forward gear driving gear (7) rotates with the shuttle shift input shaft (5); the shuttle shift output shaft (10) is mounted on one side of the shuttle shift input shaft (5) so as to rotate in parallel, and a forward gear double gear (12) is coaxially provided on one end of the shuttle shift output shaft (10); the forward gear driving gear (7) slides to engage with or disengage from the first gear of the forward gear double gear (12).

3. A 24+12 gear transmission system according to claim 2, characterized in that: The shuttle shift input shaft (5) is also provided with a reverse gear driving gear (6) coaxially with the sliding sleeve, and the reverse gear driving gear (6) rotates with the shuttle shift input shaft (5); a reverse gear idler shaft (9) rotating in parallel is provided between the shuttle shift input shaft (5) and the shuttle shift output shaft (10), and a reverse gear idler (8) is also coaxially provided with the sliding sleeve on the reverse gear idler shaft (9); the shuttle shift output shaft (10) is also provided with a reverse gear passive gear coaxially with the sliding sleeve. The reverse gear driven gear (11) and the reverse gear driving gear (6) are located on the same side of the forward gear driving gear (7) and the forward gear double gear (12), and the reverse gear driven gear (11) rotates with the shuttle shift output shaft (10); the reverse gear driving gear (6) slides to mesh with or disengage from the reverse gear idler gear (8), and the reverse gear idler gear (8) slides to mesh with or disengage from the reverse gear driven gear (11).

4. A 24+12 gear transmission system according to claim 2, characterized in that: The crawler gear speed change device (2) comprises a crawler gear double gear (13) and a crawler gear driven gear (14), wherein the first stage gear in the crawler gear double gear (13) meshes with the second stage gear in the forward gear double gear (12), and the second stage gear in the crawler gear double gear (13) meshes with the crawler gear driven gear (14).

5. The 24+12 gear transmission system according to claim 2, characterized in that: The main transmission device (3) comprises a constant mesh driving gear (15), a main transmission input gear shaft (16), a main transmission output shaft (24), a plurality of main transmission driving gears, and a plurality of main transmission passive gears corresponding to and meshing with the plurality of main transmission driving gears; the constant mesh driving gear (15) is coaxially slidably sleeved on the other end of the shuttle-type shift output shaft (10) and rotates with the shuttle-type shift output shaft (10); the main transmission output shaft (24) is coaxially mounted on one end of the shuttle-type shift output shaft (10) close to the constant mesh driving gear (15) and rotates around its own axial direction; the plurality of main transmission passive gears are coaxially slidably sleeved on the main transmission output shaft (24) at intervals and rotate with the main transmission output shaft (24); The main speed change input gear shaft (16) is coaxially mounted on one end of the shuttle shift input shaft (5) close to the main speed change output shaft (24), and the main speed change input gear shaft (16) is correspondingly meshed with the constant meshing driving gear (15); The plurality of main speed driving gears are coaxially slidably sleeved on the main speed input gear shaft (16) at intervals and rotate along with the main speed input gear shaft (16).

6. A 24+12 gear transmission system according to claim 5, characterized in that: The auxiliary speed change device (4) comprises an auxiliary speed change input gear shaft (26), an intermediate gear driving gear (27), a low gear driven gear (28), an intermediate gear driven gear (29), and an auxiliary speed change output gear shaft (30); the auxiliary speed change input gear shaft (26) is coaxially mounted on an end of the main speed change input gear shaft (16) away from the shuttle shift input shaft (5) and rotates around its own axial direction; the auxiliary speed change input gear shaft (26) is correspondingly meshed with the main speed change output shaft (24); the intermediate gear driving gear (27) is coaxially slidably sleeved on the main speed change input gear shaft (16) and the intermediate gear driving gear (27) is coaxially mounted on the main speed change input gear shaft (16). The auxiliary speed change input gear shaft (26) is mounted on the auxiliary speed change output gear shaft (30) so as to rotate in parallel with the auxiliary speed change input gear shaft (26); the low-speed passive gear (28) and the middle-speed passive gear (29) are respectively and coaxially slidably sleeved on the auxiliary speed change output gear shaft (30) at intervals, and rotate with the auxiliary speed change output gear shaft (30); the low-speed passive gear (28) is meshed with the middle-speed driving gear (27), and the low-speed passive gear (28) is correspondingly meshed with the auxiliary speed change input gear shaft (26).

7. A tractor, comprising a body, characterized in that: It also includes a transmission system as described in any one of claims 1 to 6 above, wherein the transmission system is fixed to the machine body.

Images