Multi-gear variable transmission case

Abstract

The utility model discloses a multi-gear speed change transmission case, which belongs to the technical field of tractor gearboxes and comprises a case body and a speed change transmission mechanism in the case body, the speed change transmission mechanism is additionally provided with a fixed shaft on the basis of the structure of a TE type tractor speed change mechanism, and the fixed shaft is rotatably connected with a middle-gear driving gear and a middle-gear driven gear. Wherein the medium-gear driving gear is meshed with the original III-gear driven gear, and the medium-gear driven gear is meshed with the original sliding gear, so that a medium-gear is added between a high-gear and a low-gear of each gear, when the medium-gear is not needed, transmission between the medium-gear driving gear and the medium-gear driven gear is interrupted, and when the medium-gear is needed, transmission between the medium-gear driving gear and the medium-gear driven gear is not interrupted. The medium-gear driving gear and the medium-gear driven gear are in synchronous transmission connection through the medium-gear meshing sleeve, the variable-speed transmission mechanism can achieve variable-speed transmission of 12 gears in total, and more operation requirements can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of tractor gearboxes, in particular to a multi-gear transmission box. Background Technique

[0002] When a tractor is dealing with different operation tasks, it needs to switch different traveling speeds through the gearbox and output appropriate torque at the same time. The traditional TE model tractor gearbox only has 8 transmission gears, specifically divided into low-speed first gear, high-speed first gear, low-speed second gear, high-speed second gear, low-speed third gear, high-speed third gear, low-speed fourth gear, and high-speed fourth gear. With the continuous development of modern agriculture, the operation scenarios of tractors are becoming more and more diverse. Therefore, the number of gears of the existing TE model tractor gearbox still needs to be further increased. Content of the Utility Model

[0003] In view of the above technical problems, the utility model provides a multi-gear transmission box capable of realizing 12-gear speed change transmission, which can meet more operation requirements.

[0004] To solve the above technical problems, the technical scheme adopted by the utility model is as follows:

[0005] A multi-gear transmission box includes a box body, a speed change transmission cavity is arranged on the box body, a power input shaft, a power output shaft and a fixed shaft which are parallel to each other are arranged inside the speed change transmission cavity, the power input shaft and the power output shaft are respectively rotatably connected to the side wall of the box body, and the fixed shaft is fixedly connected to the side wall of the box body;

[0006] A first spline portion is arranged on the power input shaft, an I-II gear sliding sleeve and a III-IV gear rotating sleeve are drivingly connected to the first spline portion, an I-gear driving gear and a II-gear driving gear are fixedly connected to the I-II gear sliding sleeve, a III-gear driving gear, a IV-gear driving gear and a low-gear rotating sleeve are rotatably connected to the power input shaft, and a low-gear main driven gear and a low-gear secondary driven gear are fixedly connected to the low-gear rotating sleeve;

[0007] A multi-connected rotating sleeve is rotatably connected to the power output shaft, an I-gear driven gear, a II-gear driven gear, a III-gear driven gear, a IV-gear driven gear and a low-gear driving gear are fixedly connected to the multi-connected rotating sleeve, a second spline portion is arranged on the power output shaft, and a sliding gear is drivingly connected to the second spline portion;

[0008] A middle-gear driving gear and a middle-gear driven gear are rotatably connected to the fixed shaft;

[0009] The third-gear driving gear meshes with the third-gear driven gear, the fourth-gear driving gear meshes with the fourth-gear driven gear, the low-gear driving gear meshes with the low-gear driven gear, the third-gear driven gear meshes with the middle-gear driving gear, and the middle-gear driven gear meshes with the sliding gear;

[0010] In the low-speed first gear, the first-gear driving gear meshes with the first-gear driven gear, and the sliding gear meshes with the low-gear secondary driven gear;

[0011] In the medium-speed first gear, the first-gear driving gear meshes with the first-gear driven gear, and the middle-gear driving gear and the middle-gear driven gear are in synchronous transmission;

[0012] In the high-speed first gear, the first-gear driving gear meshes with the first-gear driven gear, and the multi-connected rotating sleeve and the sliding gear are in synchronous transmission;

[0013] In the low-speed second gear, the second-gear driving gear meshes with the second-gear driven gear, and the sliding gear meshes with the low-gear secondary driven gear;

[0014] In the medium-speed second gear, the second-gear driving gear meshes with the second-gear driven gear, and the middle-gear driving gear and the middle-gear driven gear are in synchronous transmission;

[0015] In the high-speed second gear, the second-gear driving gear meshes with the second-gear driven gear, and the multi-connected rotating sleeve and the sliding gear are in synchronous transmission;

[0016] In the low-speed third gear, the third-fourth gear rotating sleeve and the third-gear driving gear are in synchronous transmission, and the sliding gear meshes with the low-gear secondary driven gear;

[0017] In the medium-speed third gear, the third-fourth gear rotating sleeve and the third-gear driving gear are in synchronous transmission, and the middle-gear driving gear and the middle-gear driven gear are in synchronous transmission;

[0018] In the high-speed third gear, the third-fourth gear rotating sleeve and the third-gear driving gear are in synchronous transmission, and the multi-connected rotating sleeve and the sliding gear are in synchronous transmission;

[0019] In the low-speed fourth gear, the third-fourth gear rotating sleeve and the fourth-gear driving gear are in synchronous transmission, and the sliding gear meshes with the low-gear secondary driven gear;

[0020] In the medium-speed fourth gear, the third-fourth gear rotating sleeve and the fourth-gear driving gear are in synchronous transmission, and the middle-gear driving gear and the middle-gear driven gear are in synchronous transmission;

[0021] In the high-speed fourth gear, the third-fourth gear rotating sleeve and the fourth-gear driving gear are in synchronous transmission, and the multi-connected rotating sleeve and the sliding gear are in synchronous transmission.

[0022] As a preferred technical solution, a first annular groove is formed between the first-gear driving gear and the second-gear driving gear. An I-II gear slide rod is slidably connected to the housing along the axial direction of the power input shaft. An I-II gear shift fork is fixedly connected to the I-II gear slide rod, and one end of the I-II gear shift fork is rotatably clamped in the first annular groove.

[0023] As a preferred technical solution, the III-IV gear rotating sleeve is located between the third-gear driving gear and the fourth-gear driving gear. An external meshing gear ring for the III-IV gears is fixedly provided on the outer peripheral surface of the III-IV gear rotating sleeve. A III-IV gear engaging sleeve is slidably sleeved on the outer periphery of the III-IV gear rotating sleeve. An internal meshing gear ring for the III-IV gears is fixedly provided on the inner peripheral surface of the III-IV gear engaging sleeve. The internal meshing gear ring for the III-IV gears meshes with the external meshing gear ring for the III-IV gears;

[0024] An external meshing gear ring for the third gear that is in clutch engagement with the internal meshing gear ring for the III-IV gears is fixedly provided on the end face of the third-gear driving gear close to the III-IV gear rotating sleeve. An external meshing gear ring for the fourth gear that is in clutch engagement with the internal meshing gear ring for the III-IV gears is fixedly provided on the end face of the fourth-gear driving gear close to the III-IV gear rotating sleeve.

[0025] As a preferred technical solution, a second annular groove is provided on the outer peripheral surface of the III-IV gear engaging sleeve. A III-IV gear slide rod is slidably connected to the housing along the axial direction of the power input shaft. A III-IV gear shift fork is fixedly connected to the III-IV gear slide rod, and one end of the III-IV gear shift fork is rotatably clamped in the second annular groove.

[0026] As a preferred technical solution, a high-gear external meshing gear ring is fixedly provided at one end of the multi-rotating sleeve close to the sliding gear. A high-gear engaging sleeve is fixedly connected to the end face of the sliding gear close to the multi-rotating sleeve. An internal meshing gear ring for the high gear that is in clutch engagement with the high-gear external meshing gear ring is fixedly provided on the inner peripheral surface of the high-gear engaging sleeve.

[0027] As a preferred technical solution, a third annular groove is provided on the outer peripheral surface of the high-gear engaging sleeve. A high-low gear slide rod is slidably connected to the housing along the axial direction of the power output shaft. A high-low gear shift fork is fixedly connected to the high-low gear slide rod, and one end of the high-low gear shift fork is rotatably clamped in the third annular groove.

[0028] As a preferred technical solution, an external meshing gear ring for the middle-gear driving gear is fixedly provided on the end face of the middle-gear driving gear close to the middle-gear driven gear. An external meshing gear ring for the middle-gear driven gear is fixedly provided on the end face of the middle-gear driven gear close to the middle-gear driving gear.

[0029] The outer peripheral sliding sleeve of the middle gear active outer meshing gear ring is provided with a middle gear meshing sleeve, and the inner peripheral surface of the middle gear meshing sleeve is fixed with a middle gear inner meshing gear ring. The middle gear inner meshing gear ring is meshed with the middle gear active outer meshing gear ring, and the middle gear inner meshing gear ring is clutch-coordinated with the middle gear driven outer meshing gear ring.

[0030] As a preferred technical solution, a fourth annular groove is provided on the outer peripheral surface of the middle gear engaging sleeve, a middle gear slide rod is slidably connected to the box body along the axial direction of the fixed shaft, a middle gear shift fork is fixedly connected to the middle gear slide rod, and one end of the middle gear shift fork is rotatably engaged in the fourth annular groove.

[0031] As a preferred technical solution, the number of teeth of the I gear driving gear, II gear driving gear, III gear driving gear, IV gear driving gear, low gear main driven gear, low gear auxiliary driven gear, I gear driven gear, II gear driven gear, III gear driven gear, IV gear driven gear, low gear driving gear, sliding gear, middle gear driving gear, and middle gear driven gear are 16, 21, 32, 37, 43, 20, 36, 32, 31, 26, 20, 43, 43, and 31 respectively.

[0032] As a preferred technical solution, one end of the power output shaft is fixedly connected with an output gear, and the output gear is a bevel gear.

[0033] The utility model adopts the above technical solution, and has the following advantages compared with the prior art:

[0034] The speed transmission mechanism in the speed transmission box can connect the original III gear driven gear with the sliding gear by adding a fixed shaft through the middle gear driving gear and the middle gear driven gear and the gear engagement sleeve on the fixed shaft. Different from the transmission mode of high gear and low gear, an intermediate speed gear can be added to each of the I, II, III and IV gears. The speed transmission mechanism can realize a total of 12 gear speed transmission, which is convenient for coping with more operation requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the structure of a multi-speed transmission box in the utility model (differential transmission mechanism omitted);

[0036] Figure 2 It is a structural schematic diagram of the speed change transmission mechanism inside the box body being in a neutral state;

[0037] Figure 3 for Figure 2 An exploded view of the power input shaft and the structure above it;

[0038] Figure 4 for Figure 2 An exploded view of the power output shaft and the structure above it;

[0039] Figure 5 is Figure 2 an exploded view of the fixed shaft and its structure thereon;

[0040] Figure 6 is a schematic structural diagram of the variable speed transmission mechanism in the low-speed first gear state;

[0041] Figure 7 is a schematic structural diagram of the variable speed transmission mechanism in the medium-speed first gear state;

[0042] Figure 8 is a schematic structural diagram of the variable speed transmission mechanism in the high-speed first gear state;

[0043] Figure 9 is a schematic structural diagram of the variable speed transmission mechanism in the low-speed second gear state;

[0044] Figure 10 is a schematic structural diagram of the variable speed transmission mechanism in the medium-speed second gear state;

[0045] Figure 11 is a schematic structural diagram of the variable speed transmission mechanism in the high-speed second gear state;

[0046] Figure 12 is a schematic structural diagram of the variable speed transmission mechanism in the low-speed third gear state;

[0047] Figure 13 is a schematic structural diagram of the variable speed transmission mechanism in the medium-speed third gear state;

[0048] Figure 14 is a schematic structural diagram of the variable speed transmission mechanism in the high-speed third gear state;

[0049] Figure 15 is a schematic structural diagram of the variable speed transmission mechanism in the low-speed fourth gear state;

[0050] Figure 16 is a schematic structural diagram of the variable speed transmission mechanism in the medium-speed fourth gear state;

[0051] Figure 17 is a schematic structural diagram of the variable speed transmission mechanism in the high-speed fourth gear state.

[0052] In the figure,

[0053] 10. Housing; 11. Variable speed transmission cavity; 12. Differential transmission cavity;

[0054] 20. Power input shaft; 21. First spline portion; 22. I-II gear sliding sleeve; 221. First gear driving gear; 222. Second gear driving gear; 223. First annular groove; 23. Third gear driving gear; 231. Third gear external meshing ring gear; 232. First needle roller bearing; 24. III-IV gear rotating sleeve; 241. III-IV gear external meshing ring gear; 25. Fourth gear driving gear; 251. Fourth gear external meshing ring gear; 252. Second needle roller bearing; 26. III-IV gear engaging sleeve; 261. III-IV gear internal meshing ring gear; 262. Second annular groove; 27. Low gear rotating sleeve; 271. Low gear main and driven gears; 272. Low gear secondary driven gear; 273. Third needle roller bearing;

[0055] 30. Power output shaft; 31. Second spline portion; 32. Multi-gear rotating sleeve; 321. First gear driven gear; 322. Second gear driven gear; 323. Third gear driven gear; 324. Fourth gear driven gear; 325. Low gear driving gear; 326. High gear external meshing ring gear; 327. Fourth needle roller bearing; 33. Sliding gear; 331. High gear engaging sleeve; 332. High gear internal meshing ring gear; 333. Third annular groove; 34. Output gear;

[0056] 40. Fixed shaft; 41. Medium gear driving gear; 411. Medium gear driving external meshing ring gear; 412. Fifth needle roller bearing; 42. Medium gear driven gear; 421. Medium gear driven external meshing ring gear; 422. Sixth needle roller bearing; 43. Medium gear engaging sleeve; 431. Medium gear internal meshing ring gear; 432. Fourth annular groove;

[0057] 50. I-II gear sliding rod; 51. I-II gear shifting fork;

[0058] 60. III-IV gear sliding rod; 61. III-IV gear shifting fork;

[0059] 70. High and low gear sliding rod; 71. High and low gear shifting fork;

[0060] 80. Medium gear sliding rod; 81. Medium gear shifting fork. Detailed implementation mode

[0061] The following will clearly and completely describe the detailed implementation mode of the present invention in conjunction with the accompanying drawings of the specification.

[0062] As Figures 1 - 5As shown, a multi-speed transmission case includes a case body 10, on which a speed transmission chamber 11 and a differential transmission chamber 12 are provided. The speed transmission chamber 11 is used to assemble a speed transmission mechanism, and the differential transmission chamber 12 is used to assemble a differential transmission mechanism. Since the utility model does not involve improvements to the existing differential transmission mechanism, the differential transmission mechanism in the differential transmission chamber 12 is omitted in the accompanying drawings. The speed transmission mechanism includes a power input shaft 20, a power output shaft 30 and a fixed shaft 40 which are arranged inside the speed transmission chamber 11 and are parallel to each other. The power input shaft 20 and the power output shaft 30 are rotatably connected to the side walls of the case body 10 respectively through bearings, and the fixed shaft 40 is fixedly connected to the side walls of the case body 10.

[0063] The power input shaft 20 is provided with a first spline portion 21, and the power input shaft 20 is sequentially sleeved with a Ⅰ-Ⅱ gear sliding sleeve 22, a Ⅲ gear driving gear 23, a Ⅲ-Ⅳ gear rotating sleeve 24, a Ⅳ gear driving gear 25 and a low gear rotating sleeve 27 from left to right, wherein the Ⅰ-Ⅱ gear sliding sleeve 22 and the Ⅲ-Ⅳ gear rotating sleeve 24 are respectively provided with a spline hole matched with the first spline portion 21, and the Ⅰ-Ⅱ gear sliding sleeve 22 and the Ⅲ-Ⅳ gear rotating sleeve 24 are respectively connected to the first spline portion 21 through the spline holes thereon, and the Ⅲ-Ⅳ gear rotating sleeve 27 is respectively connected to the first spline portion 21 through the spline holes thereon. The driving gear 23 is rotatably connected to the power input shaft 20 through the first needle bearing 232, the IV gear driving gear 25 is rotatably connected to the power input shaft 20 through the second needle bearing 252, the low gear rotating sleeve 27 is rotatably connected to the power input shaft 20 through the third needle bearing 273, the I-II gear sliding sleeve 22 can slide axially along the power input shaft 20, and the III gear driving gear 23, the III-IV gear rotating sleeve 24, the IV gear driving gear 25 and the low gear rotating sleeve 27 are all axially limited with the power input shaft 20.

[0064] The right end of the I-II gear sliding sleeve 22 is fixedly connected with the I gear driving gear 221, and the left end of the I-II gear sliding sleeve 22 is fixedly connected with the II gear driving gear 222. A first annular groove 223 is formed between the I gear driving gear 221 and the II gear driving gear 222. A I-II gear sliding rod 50 is axially slidably connected to the power input shaft 20 on the housing 10, and a I-II gear shift fork 51 is fixedly connected to the I-II gear sliding rod 50. One end of the I-II gear shift fork 51 is rotatably engaged in the first annular groove 223. The I-II gear shift fork 51 is used to shift the I-II gear sliding sleeve 22 and the I gear driving gear 221 and the II gear driving gear 222 thereon to slide axially, thereby realizing the I-II gear switching.

[0065] The III-IV gear rotating sleeve 24 is located between the III-IV gear driving gear 23 and the IV gear driving gear 25. The outer peripheral surface of the III-IV gear rotating sleeve 24 is fixedly provided with a III-IV gear outer meshing gear ring 241. The outer peripheral sliding sleeve of the III-IV gear rotating sleeve 24 is provided with a III-IV gear meshing sleeve 26. The inner peripheral surface of the III-IV gear meshing sleeve 26 is fixedly provided with a III-IV gear inner meshing gear ring 261. During the sliding process of the III-IV gear meshing sleeve 26, the III-IV gear inner meshing gear ring 261 is always in contact with the III-IV gear outer meshing gear ring 24. 1 meshing, the end surface of the III-IV gear driving gear 23 close to the III-IV gear rotating sleeve 24 is fixed with a III-gear external meshing gear ring 231, and the end surface of the IV-gear driving gear 25 close to the III-IV gear rotating sleeve 24 is fixed with a IV-gear external meshing gear ring 251, the III-gear external meshing gear ring 231 and the IV-gear external meshing gear ring 251 can be clutched with the III-IV gear internal meshing gear ring 261, that is, when the III-IV gear engaging sleeve 26 is in the middle position, the III-gear external meshing gear ring 231 and the IV-gear external meshing gear ring 251 are separated from the inner meshing gear ring 261 of the III-IV gear. When the III-IV gear engagement sleeve 26 slides to the left and approaches the III gear driving gear 23, the outer meshing gear ring 231 of the III gear meshes with the inner meshing gear ring 261 of the III-IV gear, so that the III gear driving gear 23 and the III-IV gear rotating sleeve 24 are synchronously transmitted. When the III-IV gear engagement sleeve 26 slides to the right and approaches the IV gear driving gear 25, the outer meshing gear ring 251 of the IV gear meshes with the inner meshing gear ring 261 of the III-IV gear, so that the IV gear driving gear 23 and the III-IV gear rotating sleeve 24 are synchronously transmitted. The moving gear 25 is synchronously transmitted with the III-IV gear rotating sleeve 24, and a second annular groove 262 is provided on the outer peripheral surface of the III-IV gear engaging sleeve 26. A III-IV gear slide rod 60 is axially slidably connected to the box body 10 along the power input shaft 20, and a III-IV gear shift fork 61 is fixedly connected to the III-IV gear slide rod 60. One end of the III-IV gear shift fork 61 is rotatably engaged in the second annular groove 262, and the III-IV gear engaging sleeve 26 is driven to slide axially by the III-IV gear shift fork 61 to realize the III-IV gear switching.

[0066] The left end of the low-gear rotating sleeve 27 is fixedly connected with a low-gear main driven gear 271 , and the right end of the low-gear rotating sleeve 27 is fixedly connected with a low-gear auxiliary driven gear 272 .

[0067] The power output shaft 30 is sleeved with a multi-joint rotating sleeve 32 and a sliding gear 33. The multi-joint rotating sleeve 32 is rotatably connected to the power output shaft 30 through a fourth needle bearing 327 and is axially limited with the power output shaft 30. The multi-joint rotating sleeve 32 is fixedly connected with a Ⅱ gear driven gear 322, a Ⅰ gear driven gear 321, a Ⅲ gear driven gear 323, a Ⅳ gear driven gear 324 and a low gear driving gear 325 from left to right in sequence. Among them, the Ⅰ gear driven gear 321 is located at the right end of the sliding stroke of the Ⅰ gear driving gear 221, and the Ⅱ gear driven gear 322 is located at the left end of the sliding stroke of the Ⅱ gear driving gear 222. When the Ⅰ-Ⅱ gear sliding sleeve 22 is in When in the middle position, the I gear driving gear 221 is separated from the I gear driven gear 321, and the II gear driving gear 222 is separated from the II gear driven gear 322; when the I-II gear sliding sleeve 22 slides to the right, the I gear driving gear 221 can mesh with the I gear driven gear 321; when the I-II gear sliding sleeve 22 slides to the left, the II gear driving gear 222 can mesh with the II gear driven gear 322; the III gear driven gear 323 is always meshed with the III gear driving gear 23; the IV gear driven gear 324 is always meshed with the IV gear driving gear 25; the low gear driving gear 325 is always meshed with the low gear main driven gear 271.

[0068] A second spline portion 31 is provided at the right end of the power output shaft 30, and a spline hole matching the second spline portion 31 is provided on the sliding gear 33. The sliding gear 33 is connected to the second spline portion 31 through the spline hole thereon, and is slidably connected to the second spline portion 31. The sliding gear 33 slides between the multi-link rotating sleeve 32 and the low-speed auxiliary driven gear 272. A high-speed outer meshing gear ring 326 is fixedly provided at the right end of the multi-link rotating sleeve 32, and a high-speed meshing sleeve 331 is fixedly connected to the left end surface of the sliding gear 33. A high-speed inner meshing gear ring 332 is fixedly provided on the inner circumferential surface of the high-speed meshing sleeve 331. The high-speed inner meshing gear ring 332 is clutched with the high-speed outer meshing gear ring 326, that is, when the high-speed meshing sleeve 331 is in the middle position, the high-speed inner meshing gear ring 332 is separated from the high-speed outer meshing gear ring 326, and The sliding gear 33 is separated from the low gear driven gear 272. When the high gear meshing sleeve 331 slides to the left, the high gear inner meshing gear ring 332 can mesh with the high gear outer meshing gear ring 326, so that the sliding gear 33 and the multi-link rotating sleeve 32 are synchronously transmitted. When the high gear meshing sleeve 331 slides to the right, the sliding gear 33 can mesh with the low gear driven gear 272 for transmission. A third annular groove 333 is provided on the outer circumferential surface of the high gear meshing sleeve 331. A high and low gear slide rod 70 is axially slidably connected to the box body 10 along the power output shaft 30. A high and low gear shift fork 71 is fixedly connected to the high and low gear slide rod 70. One end of the high and low gear shift fork 71 is rotatably engaged in the third annular groove 333. The high gear meshing sleeve 331 is driven to slide axially by the high and low gear shift fork 71 to realize high and low gear switching.

[0069] A middle gear driving gear 41 and a middle gear driven gear 42 are sleeved on the fixed shaft 40 from left to right in sequence. The middle gear driving gear 41 is rotatably connected to the fixed shaft 40 through a fifth needle roller bearing 412, and the middle gear driven gear 42 is rotatably connected to the fixed shaft 40 through a sixth needle roller bearing 422. The middle gear driving gear 41 and the middle gear driven gear 42 are both axially limited with the fixed shaft 40. The middle gear driving gear 41 is always meshed with the III gear driven gear 323. The middle gear driven gear 42 is a long gear and is always meshed with the sliding gear 33. A middle gear driving outer meshing gear ring 411 is fixedly provided on the right end face of the middle gear driving gear 41, and a middle gear driven outer meshing gear ring 421 is fixedly provided on the left end face of the middle gear driven gear 42. A middle gear meshing sleeve 43 is provided on the outer peripheral sliding sleeve of the middle gear driving outer meshing gear ring 411, and a middle gear inner meshing gear ring 431 is fixedly provided on the inner peripheral surface of the middle gear meshing sleeve 43. During the sliding process of the sleeve 43, the middle gear inner meshing gear ring 431 is always meshed with the middle gear active outer meshing gear ring 411, and the middle gear inner meshing gear ring 431 is clutched with the middle gear driven outer meshing gear ring 421, that is, when the middle gear engagement sleeve 43 is at the left end position, the middle gear inner meshing gear ring 431 is separated from the middle gear driven outer meshing gear ring 421, and when the middle gear engagement sleeve 43 slides to the right, the middle gear inner meshing gear ring 431 can be engaged with the middle gear driven outer meshing gear ring 421 The middle gear driving gear 41 and the middle gear driven gear 42 are meshed, so that the middle gear driving gear 41 and the middle gear driven gear 42 are synchronously transmitted. A fourth annular groove 432 is provided on the outer circumferential surface of the middle gear meshing sleeve 43. A middle gear slide rod 80 is slidably connected to the box body 10 along the axial direction of the fixed shaft 40. A middle gear shift fork 81 is fixedly connected to the middle gear slide rod 80. One end of the middle gear shift fork 81 is rotatably engaged in the fourth annular groove 432. The middle gear engagement sleeve 43 is driven to slide axially by the middle gear shift fork 81 to realize the middle gear switching.

[0070] In this embodiment, the module and number of teeth of the above-mentioned gears are as follows:

[0071] Ⅰ gear driving gear 221, 3-die, 16 teeth;

[0072] Ⅱ gear driving gear 222, 3-die, 21 teeth;

[0073] Ⅲ gear driving gear 23, 2.5 module, 32 teeth;

[0074] Ⅳ gear driving gear 25, 2.5 module, 37 teeth;

[0075] Low gear driven gear 271, 2.5 module, 43 teeth;

[0076] Low gear driven gear 272, 2.5 module, 20 teeth;

[0077] Ⅰ gear driven gear 321, 3-die, 36 teeth;

[0078] Ⅱ gear driven gear 322, 3 modules, 32 teeth;

[0079] III gear driven gear 323, 2.5 module, 31 teeth;

[0080] Driven gear 324 of gear IV, 2.5 modulus, 26 teeth;

[0081] Low gear driving gear 325, 2.5 module, 20 teeth;

[0082] Sliding gear 33, 2.5 module, 43 teeth;

[0083] Middle gear driving gear 41, 2.5 module, 43 teeth;

[0084] Middle gear driven gear 42, 2.5 module, 31 teeth.

[0085] The power input shaft 20 in the speed change transmission mechanism can be connected to the front and rear gear switching mechanism outside the box 10, and then connected to the engine through the front and rear gear switching mechanism. Since the front and rear gear switching mechanism and the engine are both existing technologies, they are not shown in the drawings. The right end of the power output shaft 30 is fixedly connected to an output gear 34, which is a bevel gear. The output gear 34 is located in the differential transmission cavity 12 and is connected to the differential transmission mechanism through the output gear 34, so as to transmit power to the wheels on both sides respectively. Except for the neutral gear, the speed change transmission mechanism can realize 12 gear switching. The specific working principle of each gear is as follows:

[0086] like Figure 6 As shown, in low speed gear I, the gear I driving gear 221 meshes with the gear I driven gear 321, and the sliding gear 33 meshes with the low gear sub-driven gear 272. The power transmission mode is: power input shaft 20—I-II gear sliding sleeve 22—Gear I driving gear 221—Gear I driven gear 321—Multi-joint rotating sleeve 32—Low gear driving gear 325—Low gear main driven gear 271—Low gear rotating sleeve 27—Low gear sub-driven gear 272—Sliding gear 33—Power output shaft 30. The transmission ratio of the power input shaft 20 to the power output shaft 30 = 36 / 16×43 / 20×43 / 20≈10.4.

[0087] like Figure 7 As shown, when the medium speed is in gear I, the gear I driving gear 221 is meshed with the gear I driven gear 321, and the middle gear driving gear 41 is synchronously driven with the middle gear driven gear 42. The power transmission mode is: power input shaft 20—I-II gear sliding sleeve 22—I gear driving gear 221—I gear driven gear 321—multi-joint rotating sleeve 32—III gear driven gear 323—middle gear driving gear 41—middle gear meshing sleeve 43—middle gear driven gear 42—sliding gear 33—power output shaft 30. The transmission ratio of the power input shaft 20 to the power output shaft 30 is 36 / 16×43 / 31×43 / 31≈4.33.

[0088] like Figure 8As shown in the figure, in the high-speed first gear, the first-gear driving gear 221 meshes with the first-gear driven gear 321, and the multi-link rotating sleeve 32 and the sliding gear 33 are synchronously driven. The power transmission mode is: power input shaft 20 - first-second gear sliding sleeve 22 - first-gear driving gear 221 - first-gear driven gear 321 - multi-link rotating sleeve 32 - high-gear engaging sleeve 331 - sliding gear 33 - power output shaft 30. The transmission ratio between the power input shaft 20 and the power output shaft 30 = 36 / 16 ≈ 2.25.

[0089] As Figure 9 shown in the figure, in the low-speed second gear, the second-gear driving gear 222 meshes with the second-gear driven gear 322, and the sliding gear 33 meshes with the low-gear secondary driven gear 272. The power transmission mode is: power input shaft 20 - first-second gear sliding sleeve 22 - second-gear driving gear 222 - second-gear driven gear 322 - multi-link rotating sleeve 32 - low-gear driving gear 325 - low-gear main and driven gear 271 - low-gear rotating sleeve 27 - low-gear secondary driven gear 272 - sliding gear 33 - power output shaft 30. The transmission ratio between the power input shaft 20 and the power output shaft 30 = 32 / 21 × 43 / 20 × 43 / 20 ≈ 7.04.

[0090] As Figure 10 shown in the figure, in the medium-speed second gear, the second-gear driving gear 222 meshes with the second-gear driven gear 322, and the medium-gear driving gear 41 and the medium-gear driven gear 42 are synchronously driven. The power transmission mode is: power input shaft 20 - first-second gear sliding sleeve 22 - second-gear driving gear 222 - second-gear driven gear 322 - multi-link rotating sleeve 32 - third-gear driven gear 323 - medium-gear driving gear 41 - medium-gear engaging sleeve 43 - medium-gear driven gear 42 - sliding gear 33 - power output shaft 30. The transmission ratio between the power input shaft 20 and the power output shaft 30 = 32 / 21 × 43 / 31 × 43 / 31 ≈ 2.93.

[0091] As Figure 11 shown in the figure, in the high-speed second gear, the second-gear driving gear 222 meshes with the second-gear driven gear 322, and the multi-link rotating sleeve 32 and the sliding gear 33 are synchronously driven. The power transmission mode is: power input shaft 20 - first-second gear sliding sleeve 22 - second-gear driving gear 222 - second-gear driven gear 322 - multi-link rotating sleeve 32 - high-gear engaging sleeve 331 - sliding gear 33 - power output shaft 30. The transmission ratio between the power input shaft 20 and the power output shaft 30 = 32 / 21 ≈ 1.52.

[0092] As Figure 12As shown in the figure, in the low-speed third gear, the third-fourth gear rotating sleeve 24 and the third gear driving gear 23 are synchronously driven, and the sliding gear 33 meshes with the low-speed secondary driven gear 272. The power transmission mode is: power input shaft 20 - third-fourth gear rotating sleeve 24 - third-fourth gear engaging sleeve 26 - third gear driving gear 23 - third gear driven gear 323 - multi-link rotating sleeve 32 - low-speed driving gear 325 - low-speed primary and secondary driven gear 271 - low-speed rotating sleeve 27 - low-speed secondary driven gear 272 - sliding gear 33 - power output shaft 30. The transmission ratio between the power input shaft 20 and the power output shaft 30 = 31 / 32 × 43 / 20 × 43 / 20 ≈ 4.48.

[0093] As Figure 13 shown in the figure, in the medium-speed third gear, the third-fourth gear rotating sleeve 24 and the third gear driving gear 23 are synchronously driven, and the medium-speed driving gear 41 and the medium-speed driven gear 42 are synchronously driven. The power transmission mode is: power input shaft 20 - third-fourth gear rotating sleeve 24 - third-fourth gear engaging sleeve 26 - third gear driving gear 23 - third gear driven gear 323 - medium-speed driving gear 41 - medium-speed engaging sleeve 43 - medium-speed driven gear 42 - sliding gear 33 - power output shaft 30. The transmission ratio between the power input shaft 20 and the power output shaft 30 = 31 / 32 × 43 / 31 × 43 / 31 ≈ 1.86.

[0094] As Figure 14 shown in the figure, in the high-speed third gear, the third-fourth gear rotating sleeve 24 and the third gear driving gear 23 are synchronously driven, and the multi-link rotating sleeve 32 and the sliding gear 33 are synchronously driven. The power transmission mode is: power input shaft 20 - third-fourth gear rotating sleeve 24 - third-fourth gear engaging sleeve 26 - third gear driving gear 23 - third gear driven gear 323 - multi-link rotating sleeve 32 - high-speed engaging sleeve 331 - sliding gear 33 - power output shaft 30. The transmission ratio between the power input shaft 20 and the power output shaft 30 = 31 / 32 ≈ 0.97.

[0095] As Figure 15 shown in the figure, in the low-speed fourth gear, the third-fourth gear rotating sleeve 24 and the fourth gear driving gear 25 are synchronously driven, and the sliding gear 33 meshes with the low-speed secondary driven gear 272. The power transmission mode is: power input shaft 20 - third-fourth gear rotating sleeve 24 - third-fourth gear engaging sleeve 26 - fourth gear driving gear 25 - fourth gear driven gear 324 - multi-link rotating sleeve 32 - low-speed driving gear 325 - low-speed primary and secondary driven gear 271 - low-speed rotating sleeve 27 - low-speed secondary driven gear 272 - sliding gear 33 - power output shaft 30. The transmission ratio between the power input shaft 20 and the power output shaft 30 = 26 / 37 × 43 / 20 × 43 / 20 ≈ 3.25.

[0096] As Figure 16As shown, in the medium-speed fourth gear, the III-IV gear sleeve 24 and the fourth-gear driving gear 25 are synchronously driven, and the medium-gear driving gear 41 and the medium-gear driven gear 42 are synchronously driven. The power transmission mode is: power input shaft 20 - III-IV gear sleeve 24 - III-IV gear engaging sleeve 26 - fourth-gear driving gear 25 - fourth-gear driven gear 324 - multi-connected gear sleeve 32 - third-gear driven gear 323 - medium-gear driving gear 41 - medium-gear engaging sleeve 43 - medium-gear driven gear 42 - sliding gear 33 - power output shaft 30. The transmission ratio between the power input shaft 20 and the power output shaft 30 = 26 / 37×43 / 31×43 / 31 ≈ 1.35.

[0097] As Figure 17 shown, in the high-speed fourth gear, the III-IV gear sleeve 24 and the fourth-gear driving gear 25 are synchronously driven, and the multi-connected gear sleeve 32 and the sliding gear 33 are synchronously driven. The power transmission mode is: power input shaft 20 - III-IV gear sleeve 24 - III-IV gear engaging sleeve 26 - fourth-gear driving gear 25 - fourth-gear driven gear 324 - multi-connected gear sleeve 32 - high-gear engaging sleeve 331 - sliding gear 33 - power output shaft 30. The transmission ratio between the power input shaft 20 and the power output shaft 30 = 26 / 37 ≈ 0.7.

[0098] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A multi-gear transmission gearbox, including a box body (10), wherein a transmission cavity (11) is provided on the box body (10), and it is characterized in that: Inside the variable speed transmission cavity (11), there are a power input shaft (20), a power output shaft (30) and a fixed shaft (40) that are parallel to each other. The power input shaft (20) and the power output shaft (30) are respectively rotatably connected to the side wall of the box body (10), and the fixed shaft (40) is fixedly connected to the side wall of the box body (10); On the power input shaft (20), there is a first spline portion (21). An I-II gear shift sleeve (22) and a III-IV gear rotating sleeve (24) are drivingly connected to the first spline portion (21). An I-gear driving gear (221) and a II-gear driving gear (222) are fixedly connected to the I-II gear shift sleeve (22). A III-gear driving gear (23), a IV-gear driving gear (25) and a low-speed rotating sleeve (27) are rotatably connected to the power input shaft (20). A low-speed main and driven gear (271) and a low-speed secondary driven gear (272) are fixedly connected to the low-speed rotating sleeve (27); A multi-gear rotating sleeve (32) is rotatably connected to the power output shaft (30). An I-gear driven gear (321), a II-gear driven gear (322), a III-gear driven gear (323), a IV-gear driven gear (324) and a low-speed driving gear (325) are fixedly connected to the multi-gear rotating sleeve (32). A second spline portion (31) is provided on the power output shaft (30). A sliding gear (33) is drivingly connected to the second spline portion (31); A medium-speed driving gear (41) and a medium-speed driven gear (42) are rotatably connected to the fixed shaft (40); The III-gear driving gear (23) meshes with the III-gear driven gear (323), the IV-gear driving gear (25) meshes with the IV-gear driven gear (324), the low-speed driving gear (325) meshes with the low-speed main and driven gear (271), the III-gear driven gear (323) meshes with the medium-speed driving gear (41), and the medium-speed driven gear (42) meshes with the sliding gear (33); In the low-speed first gear, the I-gear driving gear (221) meshes with the I-gear driven gear (321), and the sliding gear (33) meshes with the low-speed secondary driven gear (272); In the medium-speed first gear, the I-gear driving gear (221) meshes with the I-gear driven gear (321), and the medium-speed driving gear (41) and the medium-speed driven gear (42) are synchronously driven; In the high-speed first gear, the I-gear driving gear (221) meshes with the I-gear driven gear (321), and the multi-gear rotating sleeve (32) and the sliding gear (33) are synchronously driven; In the low-speed second gear, the II-gear driving gear (222) meshes with the II-gear driven gear (322), and the sliding gear (33) meshes with the low-speed secondary driven gear (272); In the medium-speed second gear, the II-gear driving gear (222) meshes with the II-gear driven gear (322), and the medium-speed driving gear (41) and the medium-speed driven gear (42) are synchronously driven; In the high-speed second gear, the II-gear driving gear (222) meshes with the II-gear driven gear (322), and the multi-gear rotating sleeve (32) and the sliding gear (33) are synchronously driven; In the low-speed third gear, the third-fourth gear rotating sleeve (24) is synchronously driven with the third gear driving gear (23), and the sliding gear (33) meshes with the low-speed secondary driven gear (272); In the medium-speed third gear, the third-fourth gear rotating sleeve (24) is synchronously driven with the third gear driving gear (23), and the medium-speed driving gear (41) is synchronously driven with the medium-speed driven gear (42); In the high-speed third gear, the third-fourth gear rotating sleeve (24) is synchronously driven with the third gear driving gear (23), and the multi-rotating sleeve (32) is synchronously driven with the sliding gear (33); In the low-speed fourth gear, the third-fourth gear rotating sleeve (24) is synchronously driven with the fourth gear driving gear (25), and the sliding gear (33) meshes with the low-speed secondary driven gear (272); In the medium-speed fourth gear, the third-fourth gear rotating sleeve (24) is synchronously driven with the fourth gear driving gear (25), and the medium-speed driving gear (41) is synchronously driven with the medium-speed driven gear (42); In the high-speed fourth gear, the third-fourth gear rotating sleeve (24) is synchronously driven with the fourth gear driving gear (25), and the multi-rotating sleeve (32) is synchronously driven with the sliding gear (33).

2. The multi-speed transmission gearbox according to claim 1, wherein: A first annular groove (223) is formed between the first gear driving gear (221) and the second gear driving gear (222). An I-II gear sliding rod (50) is slidably connected to the housing (10) along the axial direction of the power input shaft (20). An I-II gear shifting fork (51) is fixedly connected to the I-II gear sliding rod (50), and one end of the I-II gear shifting fork (51) is rotatably clamped in the first annular groove (223).

3. A multi-speed transmission case according to claim 1, characterized in that: The third-fourth gear rotating sleeve (24) is located between the third gear driving gear (23) and the fourth gear driving gear (25). An external meshing gear ring (241) of the third-fourth gear is fixedly provided on the outer peripheral surface of the third-fourth gear rotating sleeve (24). A third-fourth gear engaging sleeve (26) is slidably sleeved on the outer periphery of the third-fourth gear rotating sleeve (24). An internal meshing gear ring (261) of the third-fourth gear is fixedly provided on the inner peripheral surface of the third-fourth gear engaging sleeve (26), and the internal meshing gear ring (261) of the third-fourth gear meshes with the external meshing gear ring (241) of the third-fourth gear; An external meshing gear ring (231) that is in clutch engagement with the internal meshing gear ring (261) of the third-fourth gear is fixedly provided on the end surface of the third gear driving gear (23) close to the third-fourth gear rotating sleeve (24). An external meshing gear ring (251) that is in clutch engagement with the internal meshing gear ring (261) of the third-fourth gear is fixedly provided on the end surface of the fourth gear driving gear (25) close to the third-fourth gear rotating sleeve (24).

4. A multi-gear transmission case according to claim 3, characterized in that: A second annular groove (262) is provided on the outer peripheral surface of the third-fourth gear engaging sleeve (26). A third-fourth gear sliding rod (60) is slidably connected to the housing (10) along the axial direction of the power input shaft (20). A third-fourth gear shifting fork (61) is fixedly connected to the third-fourth gear sliding rod (60), and one end of the third-fourth gear shifting fork (61) is rotatably clamped in the second annular groove (262).

5. A multi-gear transmission case according to claim 1, characterized in that: One end of the multi - joint rotating sleeve (32) close to the sliding gear (33) is fixedly provided with a high - gear external meshing gear ring (326). On the end face of the sliding gear (33) close to the multi - joint rotating sleeve (32), a high - gear meshing sleeve (331) is fixedly connected. On the inner peripheral surface of the high - gear meshing sleeve (331), a high - gear internal meshing gear ring (332) which is in engagement and disengagement cooperation with the high - gear external meshing gear ring (326) is fixedly provided.

6. The multi-speed transmission gearbox according to claim 5, characterized in that: On the outer peripheral surface of the high - gear meshing sleeve (331), a third ring groove (333) is provided. On the housing (10), a high - and - low - gear sliding rod (70) is slidably connected along the axial direction of the power output shaft (30). A high - and - low - gear shifting fork (71) is fixedly connected to the high - and - low - gear sliding rod (70). One end of the high - and - low - gear shifting fork (71) is rotatably clamped in the third ring groove (333).

7. The multi-gear speed change transmission case according to claim 1, characterized in that: On the end face of the intermediate - gear driving gear (41) close to the intermediate - gear driven gear (42), an intermediate - gear driving external meshing gear ring (411) is fixedly provided. On the end face of the intermediate - gear driven gear (42) close to the intermediate - gear driving gear (41), an intermediate - gear driven external meshing gear ring (421) is fixedly provided. An intermediate - gear meshing sleeve (43) is slidably sleeved on the outer periphery of the intermediate - gear driving external meshing gear ring (411). On the inner peripheral surface of the intermediate - gear meshing sleeve (43), an intermediate - gear internal meshing gear ring (431) is fixedly provided. The intermediate - gear internal meshing gear ring (431) meshes with the intermediate - gear driving external meshing gear ring (411), and the intermediate - gear internal meshing gear ring (431) is in engagement and disengagement cooperation with the intermediate - gear driven external meshing gear ring (421).

8. A multi-speed transmission case according to claim 7, characterized in that: On the outer peripheral surface of the intermediate - gear meshing sleeve (43), a fourth ring groove (432) is provided. On the housing (10), an intermediate - gear sliding rod (80) is slidably connected along the axial direction of the fixed shaft (40). An intermediate - gear shifting fork (81) is fixedly connected to the intermediate - gear sliding rod (80). One end of the intermediate - gear shifting fork (81) is rotatably clamped in the fourth ring groove (432).

9. A multi-speed transmission case according to claim 1, characterized in that: The number of teeth of the first - gear driving gear (221), second - gear driving gear (222), third - gear driving gear (23), fourth - gear driving gear (25), low - gear main and driven gear (271), low - gear secondary driven gear (272), first - gear driven gear (321), second - gear driven gear (322), third - gear driven gear (323), fourth - gear driven gear (324), low - gear driving gear (325), sliding gear (33), intermediate - gear driving gear (41), and intermediate - gear driven gear (42) are 16, 21, 32, 37, 43, 20, 36, 32, 31, 26, 20, 43, 43, 31 in sequence.

10. A multi-speed transmission gearbox according to any one of claims 1-9, characterized in that: One end of the power output shaft (30) is fixedly connected with an output gear (34), and the output gear (34) is a bevel gear.

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