A cycle gear transmission

Abstract

The utility model discloses a kind of circulating gear shift, belong to the technical field of transmission, including main shaft, main shaft includes rotationally connected input shaft and output shaft, input shaft is provided with several driving gears, output shaft is provided with several output gears;First side plate and second side plate are rotationally provided with several around main shaft and be arranged in circular array distribution auxiliary shaft, one end of auxiliary shaft is provided with the transmission gear corresponding with driving gear and meshing, the other end of auxiliary shaft is provided with the intermediate gear meshing with output gear, second side plate is provided with the power structure that driving transmission gear slides on auxiliary shaft, power structure drives transmission gear on several auxiliary shafts and driving gear alternate meshing, auxiliary shaft is rotated by intermediate gear and output gear and drives output shaft, realize circulating gear change.Thus it solves the problem that the existing gear shift auxiliary shaft cannot be adjusted according to torque and rotational speed, and the volume of the transmission is reduced by arranging multiple gears in a circular array around the main shaft.

Description

Technical Field

[0001] This utility model relates to the field of transmission technology, and in particular to a cyclic gear transmission. Background Technology

[0002] As a key component of power transmission, the gearbox plays a crucial role in various mechanical equipment, especially in the automotive field. Its core function is to change the transmission ratio between the engine and drive wheels according to different working scenarios and conditions, thereby achieving rational power distribution and efficient utilization. With continuous technological advancements and increasingly demanding performance requirements from various industries, the research and innovation of gearboxes has become a vital driving force for industry development.

[0003] In the field of transmission technology, fixed-shaft transmissions typically employ a two-shaft design with a main shaft and a countershaft, achieving gear shifting through the meshing of different gears. However, when the total number of gears exceeds six, the arrangement of the shift mechanism becomes significantly more complex, resulting in a substantial increase in the overall longitudinal dimension of the transmission. Furthermore, the shared use of the same main and countershaft across multiple gears makes it impossible to simultaneously meet the performance requirements of different gears. Low-gear operation requires high torque output, which can easily lead to shaft breakage or deformation; while high-gear operation is suited to thin shafts and narrow gears to accommodate high speeds, but existing structures cannot independently design the shafts according to the torque and speed requirements of different gears. Utility Model Content

[0004] The purpose of this invention is to provide a cyclic gear transmission that solves the problem that the countershaft of existing gear transmissions cannot be adjusted according to torque and speed.

[0005] To achieve the above objectives, this utility model provides a cyclic gear transmission, including a main shaft. The main shaft includes an input shaft and an output shaft rotatably connected. The input shaft is rotatably connected to a first side plate, and the output shaft is rotatably connected to a second side plate. The input shaft is provided with a plurality of drive gears, and the output shaft is provided with a plurality of output gears. A plurality of secondary shafts are rotatably arranged between the first side plate and the second side plate in a circular array around the main shaft. One end of the secondary shaft is provided with a transmission gear that corresponds to and meshes with the drive gears, and the other end of the secondary shaft is provided with an intermediate gear that meshes with the output gears. A power structure is provided on the second side plate to drive the transmission gears to slide on the secondary shafts. The power structure drives the transmission gears on the secondary shafts to alternately mesh with the drive gears. The secondary shafts drive the output shaft to rotate through the intermediate gears and the output gears, thereby realizing cyclic gear changes.

[0006] Preferably, the driving gear includes a first driving gear and a second driving gear, both of which are fixedly mounted on the input shaft; A reverse gear structure is provided on the first side plate. The reverse gear structure includes a reverse gear shaft, which is rotatably and slidably connected to both the first side plate and the second side plate. A first reverse gear is provided at one end of the reverse gear shaft located outside the first side plate, a second reverse gear is provided on one of the countershafts, a third drive gear is provided on the input shaft, and a power element is provided outside the transmission to drive the first reverse gear to slide, so that the third drive gear meshes with the first and second reverse gears.

[0007] Preferably, the transmission gear includes a first transmission gear and a second transmission gear. Both the first transmission gear and the second transmission gear are fixedly mounted on a first sliding sleeve. The first sliding sleeve is slidably mounted on a secondary shaft. A spline is fixedly mounted on the secondary shaft to limit the sliding of the first sliding sleeve along the axial direction of the secondary shaft. The first transmission gear and the second transmission gear mesh with the first driving gear and the second driving gear, respectively, and have different transmission ratios. The distance between the first driving gear and the second driving gear is not less than the distance between the opposing surfaces of the first transmission gear and the second transmission gear.

[0008] Preferably, the power structure includes a slide rod, which is slidably connected to both the first side plate and the second side plate. A limiting block is provided on the slide rod to limit its sliding motion. Limiting holes adapted to the limiting blocks are provided on the first and second side plates. A first fixing sleeve is fixedly provided on the slide rod, and a first shift fork is fixedly provided on the first fixing sleeve. The first shift fork is located between the first transmission gear and the second transmission gear. A drive disc coaxial with the main shaft is rotatably provided on the second side plate. A first annular groove for moving the slide rod is provided on the outer wall of the drive disc. A first roller adapted to the first groove is provided on the slide rod. The first roller is located within the first groove and slides along the first groove.

[0009] Preferably, the output gear includes a first output gear, a second output gear, and a third output gear, and three countershafts are provided. Each of the three countershafts has a first intermediate gear fixedly mounted on it, which meshes with the first output gear, the second output gear, and the third output gear. The first intermediate gear has a different transmission ratio with the first output gear, the first intermediate gear has a different transmission ratio with the second output gear, and the first intermediate gear has a different transmission ratio with the third output gear.

[0010] Preferably, the first groove is provided with a first protrusion and a first groove, and the included angle between the first protrusion and the first groove is not greater than 360° / 2. n , n The number of secondary shafts; when the first roller is located at the top of the first protrusion, the second transmission gear meshes with the second drive gear; when the first roller is located at the bottom of the first groove, the first transmission gear meshes with the first drive gear.

[0011] Preferably, the power structure includes a slide rod, which is fixedly connected to the first side plate and the second side plate. A first fixed sleeve and a second fixed sleeve are slidably disposed on the slide rod. A limiting block is provided on the slide rod to limit the sliding of the first fixed sleeve and the second fixed sleeve. A limiting groove adapted to the limiting block is provided on the first fixed sleeve and the second fixed sleeve. A first shift fork is fixedly mounted on the first fixed sleeve. The first shift fork is located between the first transmission gear and the second transmission gear. The first transmission gear and the second transmission gear are fixedly mounted on the first sliding sleeve. The first sliding sleeve is slidably mounted on the outside of the sub-shaft. The first side plate and the second side plate are connected by a housing. A drive disk coaxial with the main shaft is rotatably mounted on the inner wall of the housing. A first groove that drives the first fixed sleeve to move is provided on the inner side wall of the drive disk. A first roller that matches the first groove is provided on the first fixed sleeve. The first roller is located in the first groove and slides along the first groove. A second shift fork is fixedly mounted on the second fixed sleeve. The second shift fork is located between the second intermediate gear and the third intermediate gear. The second intermediate gear and the third intermediate gear are fixedly mounted on the second sliding sleeve. The second sliding sleeve is slidably mounted on the outside of the sub-shaft. A second sliding groove is provided on the inner side wall of the drive disc to drive the second fixed sleeve to move. A second roller is provided on the second fixed sleeve to match the second sliding groove. The second roller is located in the second sliding groove and slides along the second sliding groove.

[0012] Preferably, the output gear includes a fourth output gear and a fifth output gear, and there are two countershafts. The second intermediate gear and the third intermediate gear are slidably disposed at one end of the countershaft near the output shaft. The second intermediate gear and the third intermediate gear mesh with the fourth output gear and the fifth output gear, respectively. The second intermediate gear and the fourth output gear, and the third intermediate gear and the fifth output gear have different transmission ratios.

[0013] Preferably, the first groove includes a first straight section and a first shifting section. The length of the first straight section is not less than the length of the first shifting section projected onto the first straight section. The first shifting section includes a smoothly connected second convex groove and a second recess, which are located on both sides of the first straight section.

[0014] Preferably, the second slide groove includes a second straight section and a second shift section. The second straight section corresponds to the first straight section. The second shift section includes two sets of shift sections that are smoothly connected. Each set of shift sections includes a third convex groove and a third recess that are smoothly connected. The third convex groove and the third recess are located on the upper and lower sides of the second straight section and are spaced apart. The two sets of shift sections correspond to the second convex groove and the second recess, respectively.

[0015] The advantages and positive effects of the cyclic gear transmission described in this utility model are as follows: This utility model has several secondary shafts arranged outside the main shaft. Each secondary shaft has a transmission gear that meshes with the drive gear on the input shaft, and an intermediate gear that meshes with the output gear on the output shaft. By using gears on different secondary shafts to mesh with the drive gear and the output gear, different gear outputs are achieved. The secondary shafts can be independently designed according to torque and speed requirements, meeting the requirements of different torques and speeds on the shaft structure, which is beneficial to improving the stability of the structure and transmission. It is especially suitable for special working conditions such as racing cars where the gear transmission requires high torque. This utility model, by setting an annular first and second sliding groove, achieves gear switching during the rotation of the drive disc, ensuring smooth positioning and switching and preventing gear misalignment.

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present utility model; Figure 2 This is a front view structural diagram of Embodiment 1 of the present utility model; Figure 3 This is a cross-sectional structural diagram of Embodiment 1 of the present invention; Figure 4 This is a three-dimensional structural diagram of the main shaft of Embodiment 1 of this utility model; Figure 5 This is a front view structural diagram of the main shaft of Embodiment 1 of this utility model; Figure 6 This is a schematic diagram of the main shaft cross-section structure of Embodiment 1 of this utility model; Figure 7 This is a three-dimensional structural diagram of the secondary shaft of Embodiment 1 of this utility model; Figure 8 This is a front view schematic diagram of the secondary shaft structure in Embodiment 1 of this utility model; Figure 9 This is a three-dimensional structural diagram of the drive disk of Embodiment 1 of this utility model; Figure 10 This is a schematic diagram of the reverse gear structure of Embodiment 1 of this utility model; Figure 11 This is a three-dimensional structural diagram of Embodiment 2 of the present invention; Figure 12 This is a cross-sectional structural diagram of Embodiment 2 of the present invention; Figure 13 This is a schematic diagram of the internal structure of Embodiment 2 of the present invention; Figure 14 This is a schematic diagram of the speed-changing part of Embodiment 2 of this utility model; Figure 15 This is a three-dimensional structural diagram of the drive disk in Embodiment 2 of this utility model; Figure 16 This is a schematic diagram of the unfolded structure of the drive disk in Embodiment 2 of this utility model.

[0018] Figure Labels 1. First side plate; 2. Second side plate; 3. Input shaft; 4. Output shaft; 5. Sub-shaft; 6. First drive gear; 7. Second drive gear; 8. First output gear; 9. Second output gear; 10. Third output gear; 11. First transmission gear; 12. Second transmission gear; 13. First intermediate gear; 14. Spline; 15. Slide rod; 16. First fixing sleeve; 17. First shift fork; 18. Limiting block; 19. First roller; 20. Drive disc; 21. First slide groove; 22. 23. First groove; 24. Fourth output gear; 25. Fifth output gear; 26. Second intermediate gear; 27. Third intermediate gear; 28. Second fixed sleeve; 29. ​​Second shift fork; 30. Second sliding groove; 31. Housing; 32. First straight section; 33. Second groove; 34. Second groove; 35. Second straight section; 36. Third groove; 37. Third groove; 38. Reverse gear shaft; 39. First reverse gear; 40. Second reverse gear; 41. Third drive gear. Detailed Implementation

[0019] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] In this application, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit the scope of this application.

[0021] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0022] Example 1 like Figure 1-9 As shown, a cyclic gear transmission includes a main shaft, which comprises an input shaft 3 and an output shaft 4 rotatably connected by bearings, and the input shaft 3 and output shaft 4 are coaxially arranged. The input shaft 3 is rotatably connected to a first side plate 1 via bearings, and the output shaft 4 is rotatably connected to a second side plate 2 via bearings. The input shaft 3 is provided with several drive gears, and the output shaft 4 is provided with several output gears in the form of a camshaft structure. Several secondary shafts 5 are rotatably arranged between the first side plate 1 and the second side plate 2, arranged in a circular array around the main shaft, and the secondary shafts 5 are rotatably connected to both the first side plate 1 and the second side plate 2 via bearings.

[0023] One end of the secondary shaft 5 is provided with a transmission gear that corresponds to and meshes with the drive gear, and the other end of the secondary shaft 5 is provided with an intermediate gear that meshes with the output gear. The drive gear drives the output gear to rotate through the transmission gear and the intermediate gear, and the power is output through the output shaft 4.

[0024] The driving gear includes a first driving gear 6 and a second driving gear 7. Both the first driving gear 6 and the second driving gear 7 are fixedly mounted on the input shaft 3 by means of a key block in an interference fit.

[0025] The transmission gears include a first transmission gear 11 and a second transmission gear 12, both of which are fixedly mounted on a first sliding sleeve. The first sliding sleeve is slidably mounted on a secondary shaft 5. A spline 14 is fixedly mounted on the secondary shaft 5 to limit the sliding of the first sliding sleeve along the axial direction of the secondary shaft 5. The first sliding sleeve has a keyway adapted to the spline 14, and the first sliding groove 21 is connected to the secondary shaft 5 through a clearance fit, thereby enabling the first sliding sleeve to slide along the secondary shaft 5.

[0026] The first transmission gear 11 and the second transmission gear 12 mesh with the first driving gear 6 and the second driving gear 7 respectively and have different transmission ratios. The distance between the first driving gear 6 and the second driving gear 7 is not less than the distance between the opposing surfaces of the first transmission gear 11 and the second transmission gear 12, that is, the first transmission gear 11 and the second transmission gear 12 can be completely positioned between the first driving gear 6 and the second driving gear 7 without meshing, thereby realizing the shift to neutral.

[0027] The second side plate 2 is equipped with a power structure that drives the transmission gear to slide on the countershaft 5. The power structure includes a slide rod 15, which is slidably connected to both the first side plate 1 and the second side plate 2. The slide rod 15 is arranged in a one-to-one correspondence with the countershaft 5, and the slide rod 15 is offset from the countershaft 5, meaning the line connecting the slide rod 15 and its corresponding countershaft 5 does not pass through the axis of the main shaft. This arrangement helps to reduce the size of the transmission. A limiting block 18 is fixedly installed on the slide rod 15 to limit its sliding. The first side plate 1 and the second side plate 2 are provided with limiting holes that are adapted to the limiting block 18. Under the action of the limiting block 18 and the limiting holes, the slide rod 15 slides without rotating. A first fixing sleeve 16 is fixedly installed on the slide rod 15 by screws or set screws. A first shift fork 17 is fixedly installed on the first fixing sleeve 16, and the first shift fork 17 is located between the first transmission gear 11 and the second transmission gear 12. The distance between the first transmission gear 11 and the second transmission gear 12 is slightly larger than that between the first shift fork 17, making it easier for the first shift fork 17 to be inserted between the first transmission gear 11 and the second transmission gear 12. The first shift fork 17 does not directly contact the countershaft 5, thus avoiding affecting the rotation of the countershaft 5.

[0028] A drive disc 20, coaxial with the main shaft, is rotatably mounted on the second side plate 2. The drive disc 20 is located outside the second side plate 2 and is rotatably connected to the output shaft 4 via bearings. An annular first slide groove 21, which drives the slide rod 15, is provided on the outer wall of the drive disc 20. A first roller 19, adapted to the first slide groove 21, is rotatably mounted on the slide rod 15. The first roller 19 is located within the first slide groove 21 and slides along it. The diameter of the first roller 19 is slightly smaller than the width of the first slide groove 21, allowing the first roller 19 to slide smoothly within the first slide groove 21.

[0029] The first slide groove 21 is provided with a first protrusion 22 and a first groove 23. The included angle between the first protrusion 22 and the first groove 23 is no greater than 360° / 2n, where n is the number of countershafts 5. When the first roller 19 is located at the top of the first protrusion 22, the second transmission gear 12 meshes with the second drive gear 7. When the first roller 19 is located at the bottom of the first groove 23, the first transmission gear 11 meshes with the first drive gear 6.

[0030] The power to rotate the drive disk 20 can be provided by an existing stepper motor, which drives the drive disk 20 to rotate via gears and a gear ring on the outer wall of the drive disk 20. Other existing technologies can also be used to power the rotation of the drive disk 20, as long as they can achieve the required rotation of the drive disk 20.

[0031] The output gears include a first output gear 8, a second output gear 9, and a third output gear 10, all of which are fixedly connected to the output shaft 4. Three secondary shafts 5 are provided, each with a first intermediate gear 13 fixedly mounted via a spline 14 or key block interference fit, meshing with the first output gear 8, second output gear 9, and third output gear 10. Different transmission ratios exist between the first intermediate gear 13 and the first output gear 8, between the first intermediate gear 13 and the second output gear 9, and between the first intermediate gear 13 and the third output gear 10. In this embodiment, the first driving gear 6 has 23 teeth, the second driving gear 7 has 22 teeth, the first output gear 8 has 18 teeth, the second output gear 9 has 20 teeth, and the third output gear 10 has 22 teeth. The three secondary shafts 5 are respectively the 1-2 gear shaft, the 3-4 gear shaft, and the 5-6 gear shaft, achieving a 6-speed output. The three countershafts 5 can be independently designed according to torque and speed requirements, meeting the requirements of different torques and speeds on the shaft structure, which is beneficial to improving the stability of the structure and transmission. Six-speed output is achieved through the three countershafts 5, which helps increase the number of gears and provides a wider gear ratio. The countershafts 5 are arranged in a circular array outside the main shaft, achieving a multi-gear circular arrangement, which helps reduce the size of the transmission. In use, the drive disc 20 drives the slide rod 15 to slide through the first slide groove 21 and the first roller 19. Two slide rods 15 are located in the smooth section of the first slide groove 21, and one slide rod 15 slides into the first groove 23. At this time, the slide rod 15 drives the first transmission gear 11 on the first countershaft 5 to mesh with the first drive gear 6 on the input shaft 3 through the shift fork. The input shaft 3 drives the first countershaft 5 to rotate through the first drive gear 6 and the first transmission gear 11. The first countershaft 5 drives the output shaft 4 to rotate through the first intermediate gear 13 and the first output gear 8 on it, achieving first-gear output.

[0032] The drive disc 20 rotates, driving the slide rod 15 to slide through the first slide groove 21 and the first roller 19. Two slide rods 15 are located in the smooth section of the first slide groove 21, and one slide rod 15 slides into the first convex groove 22. At this time, the slide rod 15 drives the second transmission gear 12 on the first sub-shaft 5 to mesh with the second drive gear 7 on the input shaft 3 through the shift fork. The input shaft 3 drives the first sub-shaft 5 to rotate through the second drive gear 7 and the second transmission gear 12. The first sub-shaft 5 drives the output shaft 4 to rotate through the first intermediate gear 13 and the first output gear 8 on it, realizing the second-gear output.

[0033] The drive disc 20 rotates, driving the slide rod 15 to slide through the first slide groove 21 and the first roller 19. Two slide rods 15 are located in the smooth section of the first slide groove 21, and one slide rod 15 slides into the first groove 23. At this time, the slide rod 15 drives the first transmission gear 11 on the second sub-shaft 5 to mesh with the first drive gear 6 on the input shaft 3 through the shift fork. The input shaft 3 drives the second sub-shaft 5 to rotate through the first drive gear 6 and the first transmission gear 11. The second sub-shaft 5 drives the output shaft 4 to rotate through the first intermediate gear 13 and the second output gear 9 on it, realizing three-speed output.

[0034] The drive disc 20 rotates, driving the slide rod 15 to slide through the first slide groove 21 and the first roller 19. Two slide rods 15 are located in the smooth section of the first slide groove 21, and one slide rod 15 slides into the first convex groove 22. At this time, the slide rod 15 drives the second transmission gear 12 on the second sub-shaft 5 to mesh with the second drive gear 7 on the input shaft 3 through the shift fork. The input shaft 3 drives the second sub-shaft 5 to rotate through the second drive gear 7 and the second transmission gear 12. The second sub-shaft 5 drives the output shaft 4 to rotate through the first intermediate gear 13 and the second output gear 9 on it, realizing four-speed output.

[0035] The drive disc 20 rotates, driving the slide rod 15 to slide through the first slide groove 21 and the first roller 19. Two slide rods 15 are located in the smooth section of the first slide groove 21, and one slide rod 15 slides into the first groove 23. At this time, the slide rod 15 drives the first transmission gear 11 on the third sub-shaft 5 to mesh with the first drive gear 6 on the input shaft 3 through the shift fork. The input shaft 3 drives the third sub-shaft 5 to rotate through the first drive gear 6 and the first transmission gear 11. The third sub-shaft 5 drives the output shaft 4 to rotate through the first intermediate gear 13 and the third output gear 10 on it, realizing five-speed output.

[0036] The drive disc 20 rotates, causing the slide rods 15 to slide via the first slide groove 21 and the first roller 19. Two slide rods 15 are located within the smooth section of the first slide groove 21, while one slide rod 15 slides into the first protrusion 22. At this time, the slide rod 15 drives the second transmission gear 12 on the third sub-shaft 5 to mesh with the second drive gear 7 on the input shaft 3 via the shift fork. The input shaft 3 drives the third sub-shaft 5 to rotate via the second drive gear 7 and the second transmission gear 12. The third sub-shaft 5 drives the output shaft 4 to rotate via the first intermediate gear 13 and the third output gear 10 on it, thus achieving six-speed output. There is a neutral position between each gear. One rotation of the drive disc 20 completes the switching of the six gears. The drive disc 20 can continue to rotate to enter the next gear cycle, or it can rotate in the opposite direction to achieve a downshift operation.

[0037] like Figure 10As shown, a reverse gear structure can also be provided on the first side plate 1. The reverse gear structure includes a reverse gear shaft 38, which is rotatably and slidably connected to both the first side plate 1 and the second side plate 2. A first reverse gear 39 is fixedly installed at one end of the reverse gear shaft 38 located outside the first side plate 1. A second reverse gear 40 is fixedly installed on one of the auxiliary shafts 5, and a third drive gear 41 is fixedly installed on the input shaft 3. Both the second reverse gear 40 and the third drive gear 41 are located outside the first side plate 1. A power element is provided outside the transmission to drive the reverse gear shaft 38 to slide. The power element can be an existing cylinder, electric cylinder, stepper motor, or cable structure as needed. The power element drives the reverse gear shaft 38 to slide, so that the third drive gear 41 meshes with the first reverse gear 39 and the second reverse gear 40, realizing the reverse gear function. In actual setup, the reverse gear shaft 38 can be rotatably connected to the first side plate 1 and the second side plate 2, the first reverse gear 39 can be slidably connected to the reverse gear shaft 38, the power element can be connected to the first reverse gear 39, and the power element can drive the first reverse gear 39 to slide on the reverse gear shaft 38.

[0038] The power element drives the reverse gear shaft 38 to slide, causing the third drive gear 41 to mesh with the first reverse gear 39 and the second reverse gear 40. The power from the input shaft 3 is transmitted to the auxiliary shaft 5 through the third drive gear 41, the first reverse gear 39, and the second reverse gear 40. The auxiliary shaft 5 transmits the power to the output shaft 4 through the first intermediate gear 13 mounted on it, thus achieving reverse gear output. When outputting in reverse gear, it must be ensured that none of the three auxiliary shafts 5 mesh with the first drive gear 6 and the second drive gear 7 through the first transmission gear 11 and the second transmission gear 12.

[0039] Example 2 like Figure 11-16 As shown, a cyclic gear transmission includes a main shaft, which comprises an input shaft 3 and an output shaft 4 rotatably connected by bearings, and the input shaft 3 and output shaft 4 are coaxially arranged. The input shaft 3 is rotatably connected to a first side plate 1 by bearings, and the output shaft 4 is rotatably connected to a second side plate 2 by bearings. A plurality of drive gears are arranged on the input shaft 3, and a plurality of output gears are arranged on the output shaft 4. A plurality of secondary shafts 5 are rotatably arranged between the first side plate 1 and the second side plate 2, arranged in a circular array around the main shaft, and the secondary shafts 5 are rotatably connected to both the first side plate 1 and the second side plate 2 by bearings.

[0040] One end of the secondary shaft 5 is provided with a transmission gear that corresponds to and meshes with the drive gear, and the other end of the secondary shaft 5 is provided with an intermediate gear that meshes with the output gear. The drive gear drives the output gear to rotate through the transmission gear and the intermediate gear, and the power is output through the output shaft 4.

[0041] The driving gear includes a first driving gear 6 and a second driving gear 7. Both the first driving gear 6 and the second driving gear 7 are fixedly mounted on the input shaft 3 by means of a key block in an interference fit.

[0042] The transmission gears include a first transmission gear 11 and a second transmission gear 12, both of which are fixedly mounted on a first sliding sleeve. The first sliding sleeve is slidably mounted on a secondary shaft 5. A spline 14 is fixedly mounted on the secondary shaft 5 to limit the sliding of the first sliding sleeve along the axial direction of the secondary shaft 5. The first sliding sleeve has a keyway that matches the spline 14. The first sliding sleeve and the secondary shaft 5 are connected by a clearance fit, allowing the first sliding sleeve to slide along the secondary shaft 5.

[0043] The first transmission gear 11 and the second transmission gear 12 mesh with the first driving gear 6 and the second driving gear 7 respectively, and have different transmission ratios. The distance between the first driving gear 6 and the second driving gear 7 is not less than the distance between the opposing surfaces of the first transmission gear 11 and the second transmission gear 12, that is, the first transmission gear 11 and the second transmission gear 12 can be completely positioned between the first driving gear 6 and the second driving gear 7 without meshing, thereby realizing the shift to neutral. A power structure for driving the transmission gears to slide on the countershaft 5 is provided on the second side plate 2. The power structure includes a slide rod 15, which is fixedly connected to both the first side plate 1 and the second side plate 2. A first fixed sleeve 16 and a second fixed sleeve 28 are slidably provided on the slide rod 15. A limiting block 18 is fixedly provided on the slide rod 15 to limit the sliding of the first fixed sleeve 16 and the second fixed sleeve 28, and the first fixed sleeve 16 and the second fixed sleeve 28 are provided with limiting grooves adapted to the limiting block 18. Under the action of the limiting block 18 and the limiting groove, the first fixed sleeve 16 and the second fixed sleeve 28 can only slide along the slide rod 15 and cannot rotate. The second fixed sleeve can also be slidably disposed outside the first fixed sleeve, and a limiting platform is disposed outside the first fixed sleeve to limit the sliding of the second fixed sleeve, so that the second fixed sleeve and the first fixed sleeve can only slide without rotating.

[0044] A first shift fork 17 is fixedly disposed on the first fixed sleeve 16, and the first shift fork 17 is located between the first transmission gear 11 and the second transmission gear 12. The distance between the first transmission gear 11 and the second transmission gear 12 is slightly larger than the first shift fork 17, so that the first shift fork 17 can be inserted between the first transmission gear 11 and the second transmission gear 12.

[0045] The first side plate 1 and the second side plate 2 are fixedly connected by a housing 31. A drive disk 20, coaxial with the main shaft, is rotatably mounted on the inner wall of the housing 31. The drive disk 20 is sleeved on the outside of the main shaft, the secondary shaft 5, and the slide rod 15. An annular first groove 21, which drives the first fixed sleeve 16 to move, is provided on the inner wall of the drive disk 20. A first roller 19, adapted to the first groove 21, is rotatably mounted on the first fixed sleeve 16. The first roller 19 is located within the first groove 21 and slides along it. The diameter of the first roller 19 is slightly smaller than the width of the first groove 21, allowing the first roller 19 to slide smoothly within the first groove 21.

[0046] A second fork 29 is fixedly mounted on the second fixed sleeve 28. The second fork 29 is located between the second intermediate gear 26 and the third intermediate gear 27. The distance between the second intermediate gear 26 and the third intermediate gear 27 is slightly larger than that between the second fork 29, so that the second fork 29 can be inserted between the second intermediate gear 26 and the third intermediate gear 27.

[0047] The second intermediate gear 26 and the third intermediate gear 27 are fixedly mounted on the second sliding sleeve. The second sliding sleeve is slidably fitted onto the outside of the countershaft 5 via a spline 14. The second sliding sleeve and the countershaft 5 are in clearance fit, and the second sliding sleeve can only slide along the countershaft 5 and cannot rotate. The inner sidewall of the drive disc 20 is provided with an annular second sliding groove 30 that drives the second fixed sleeve 28 to move. The second fixed sleeve 28 is provided with a second roller that matches the second sliding groove 30. The second roller is located inside the second sliding groove 30 and slides along the second sliding groove 30.

[0048] Neither the first shift fork 17 nor the second shift fork 29 directly contacts the secondary shaft 5, so as to avoid affecting the rotation of the secondary shaft 5.

[0049] The output gears include a fourth output gear 24 and a fifth output gear 25, both of which are interference-fitted with the output shaft 4 via a key and spline 14. Two countershafts 5 are provided, with a second intermediate gear 26 and a third intermediate gear 27 slidably disposed at one end of the countershaft 5 near the output shaft 4. The second intermediate gear 26 and the third intermediate gear 27 mesh with the fourth output gear 24 and the fifth output gear 25, respectively. The second intermediate gear 26 has a different transmission ratio with the fourth output gear 24, and the third intermediate gear 27 has a different transmission ratio with the fifth output gear 25. The distance between the fourth output gear 24 and the fifth output gear 25 must be sufficient to accommodate the second intermediate gear 26 and the third intermediate gear 27.

[0050] The first slide 21 includes a first straight section 32 and a first shift section, and the second slide 30 includes a second straight section 35 and a second shift section. The first straight section 32 and the second straight section 35 are correspondingly arranged and are equidistant. The length of the first straight section 32 is not less than the length of the first shift section projected onto the first straight section 32, so as to ensure that one sub-shaft 5 is always in neutral and the other sub-shaft 5 switches between gears.

[0051] The second slide 30 includes a second straight section 35 and a second shift section. The second straight section 35 corresponds to the first straight section 32. The second shift section includes two sets of shift sections that are smoothly connected. Each set of shift sections includes a third convex groove 36 and a third groove 37 that are smoothly connected. The third convex groove 36 and the third groove 37 are located on the upper and lower sides of the second straight section 35 and are spaced apart. The two sets of shift sections correspond to the second convex groove 33 and the second groove 34, respectively.

[0052] In the four arc segments of the third protrusion 36 and the third groove 37, the included angle between adjacent arc segments is no greater than 180° / 4. In this embodiment, the acute angle between the two secondary shafts is 160°, and the included angle between adjacent arc segments of the third protrusion 36 and the third groove 37 is 40°. The projected length of the first slide groove 21 and the second slide groove 30 in the direction of the first straight section 32 is 1570.8 mm. The vertical distance between the top center of the second protrusion 33 and the second groove 34 and the first straight section 32 is 50 mm. The vertical distance between the top center of the third protrusion 36 and the third groove 37 and the second straight section 35 is 50 mm. The projected length of each shift segment on the second straight section 35 is 349.06 mm.

[0053] The power to rotate the drive disk 20 can be provided by an existing stepper motor, which drives the drive disk 20 to rotate via gears and a gear ring on the outer wall of the drive disk 20. Other existing technologies can also be used to power the rotation of the drive disk 20, as long as they can achieve the required rotation of the drive disk 20.

[0054] The two countershafts 5 are respectively the 1-4 gear shaft and the 5-8 gear shaft, realizing eight-speed output from two shafts. Achieving eight-speed output through two countershafts 5 increases the number of gears and provides a wider gear ratio range. The countershafts 5 are arranged in a circular array outside the main shaft, achieving a multi-gear circular arrangement, which helps reduce the size of the transmission.

[0055] In use, the drive disc 20 drives the first shift fork 17 to slide via the first slide groove 21 and the first roller 19, and drives the second shift fork 29 to slide via the second slide groove 30 and the second roller. The first shift fork 17 and the second shift fork 29 on one sub-shaft 5 slide within the first straight section 32 and the second straight section 35 respectively, and are in neutral. The first shift fork 17 on the other sub-shaft 5 enters the second convex groove 33, and drives the first transmission gear 11 and the second transmission gear 12 to move upward. The first transmission gear 11 meshes with the first drive gear 6. The second shift fork 29 enters the third convex groove 36, and drives the second intermediate gear 26 and the third intermediate gear 27 to move upward. The second intermediate gear 26 meshes with the fourth output gear 24. The power of the drive shaft is output through the first drive gear 6, the first transmission gear 11, the sub-shaft 5, the second intermediate gear 26, the fourth output gear 24 and the output shaft 4, realizing first gear output.

[0056] The first shift fork 17 and the second shift fork 29 on one of the sub-shafts 5 continue to slide within the first straight section 32 and the second straight section 35 respectively, and are in neutral. The first shift fork 17 on the other sub-shaft 5 is still sliding within the second convex groove 33, and the first transmission gear 11 meshes with the first drive gear 6; the second shift fork 29 enters the third groove 37 from the third convex groove 36, and the second shift fork 29 drives the second intermediate gear 26 and the third intermediate gear 27 to move downward. The third intermediate gear 27 meshes with the fifth output gear 25, and the power of the drive shaft is output through the first drive gear 6, the first transmission gear 11, the sub-shaft 5, the third intermediate gear 27, the fifth output gear 25 and the output shaft 4 to achieve second gear output.

[0057] The first shift fork 17 and the second shift fork 29 on one countershaft 5 continue to slide within the first straight section 32 and the second straight section 35 respectively, and are in neutral. The first shift fork 17 on the other countershaft 5 enters the second groove 34 from the second protrusion 33. The first shift fork 17 drives the first transmission gear 11 and the second transmission gear 12 to move downward, and the second transmission gear 12 meshes with the second drive gear 7. The second shift fork 29 enters the third protrusion 36 of another shift section from the third groove 37. The second shift fork 29 drives the second intermediate gear 26 and the third intermediate gear 27 to move upward. The second intermediate gear 26 meshes with the fourth output gear 24. The power of the drive shaft is output through the second drive gear 7, the second transmission gear 12, the countershaft 5, the second intermediate gear 26, the fourth output gear 24 and the output shaft 4 to achieve three-speed output.

[0058] The first shift fork 17 and the second shift fork 29 on one of the sub-shafts 5 continue to slide within the first straight section 32 and the second straight section 35 respectively, and are in neutral. The first shift fork 17 on the other sub-shaft 5 is still sliding within the second groove 34, and the second transmission gear 12 meshes with the second drive gear 7; the second shift fork 29 enters the third groove 37 from the third protrusion 36, and the second shift fork 29 drives the second intermediate gear 26 and the third intermediate gear 27 to move downward. The third intermediate gear 27 meshes with the fifth output gear 25, and the power of the drive shaft is output through the second drive gear 7, the second transmission gear 12, the sub-shaft 5, the third intermediate gear 27, the fifth output gear 25 and the output shaft 4 to achieve four-speed output.

[0059] The first shift fork 17 on another countershaft 5 slides from the second groove 34 to the first straight section 32, and the second shift fork 29 slides from the third groove 37 to the second straight section 35, thus entering neutral. The first shift fork 17 of the countershaft 5, which was originally in neutral, enters the second protrusion 33. The first shift fork 17 drives the first transmission gear 11 and the second transmission gear 12 to move upward, and the first transmission gear 11 meshes with the first drive gear 6. The second shift fork 29 enters the third protrusion 36, and the second shift fork 29 drives the second intermediate gear 26 and the third intermediate gear 27 to move upward. The second intermediate gear 26 meshes with the fourth output gear 24. The power of the drive shaft is output through the first drive gear 6, the first transmission gear 11, the countershaft 5, the second intermediate gear 26, the fourth output gear 24, and the output shaft 4, realizing five-speed output.

[0060] The first shift fork 17 and the second shift fork 29 on the other countershaft 5 continue to slide within the first straight section 32 and the second straight section 35 respectively, in neutral. The first shift fork 17 on one countershaft 5 still slides within the second convex groove 33, and the first transmission gear 11 meshes with the first drive gear 6; the second shift fork 29 enters the third groove 37 from the third convex groove 36, and the second shift fork 29 drives the second intermediate gear 26 and the third intermediate gear 27 to move downward. The third intermediate gear 27 meshes with the fifth output gear 25, and the power of the drive shaft is output through the first drive gear 6, the first transmission gear 11, the countershaft 5, the third intermediate gear 27, the fifth output gear 25 and the output shaft 4 to achieve six-speed output.

[0061] The first shift fork 17 and the second shift fork 29 on the other countershaft 5 continue to slide within the first straight section 32 and the second straight section 35 respectively, and are in neutral. The first shift fork 17 on one countershaft 5 enters the second groove 34 from the second protrusion 33. The first shift fork 17 drives the first transmission gear 11 and the second transmission gear 12 to move downward, and the second transmission gear 12 meshes with the second drive gear 7. The second shift fork 29 enters the third protrusion 36 of another shift section from the third groove 37. The second shift fork 29 drives the second intermediate gear 26 and the third intermediate gear 27 to move upward. The second intermediate gear 26 meshes with the fourth output gear 24. The power of the drive shaft is output through the second drive gear 7, the second transmission gear 12, the countershaft 5, the second intermediate gear 26, the fourth output gear 24 and the output shaft 4 to achieve seven-speed output.

[0062] The first shift fork 17 and the second shift fork 29 on the other countershaft 5 continue to slide within the first straight section 32 and the second straight section 35 respectively, in neutral. The first shift fork 17 on one countershaft 5 still slides within the second groove 34, and the second transmission gear 12 meshes with the second drive gear 7; the second shift fork 29 enters the third groove 37 from the third protrusion 36, and the second shift fork 29 drives the second intermediate gear 26 and the third intermediate gear 27 to move downward. The third intermediate gear 27 meshes with the fifth output gear 25, and the power of the drive shaft is output through the second drive gear 7, the second transmission gear 12, the countershaft 5, the third intermediate gear 27, the fifth output gear 25 and the output shaft 4, realizing eight-speed output.

[0063] As rotation continues, both countershafts 5 are in neutral. One rotation of the drive disc 20 completes the switching between eight gears and neutral. The drive disc 20 can continue rotating to enter the next gear cycle, or it can be rotated in reverse to achieve a downshift operation.

[0064] A reverse gear structure can also be provided on the first side plate 1. The reverse gear structure includes a reverse gear shaft 38, which is rotatably and slidably connected to both the first side plate 1 and the second side plate 2. A first reverse gear 39 is fixedly installed at one end of the reverse gear shaft 38 located outside the first side plate 1. A second reverse gear 40 is fixedly installed on one of the auxiliary shafts 5, and a third drive gear 41 is fixedly installed on the input shaft 3. Both the second reverse gear 40 and the third drive gear 41 are located outside the first side plate 1. A power element is provided outside the transmission to drive the reverse gear shaft 38 to slide. The power element can be an existing cylinder, electric cylinder, stepper motor, or cable structure as needed. The power element drives the reverse gear shaft 38 to slide, so that the third drive gear 41 meshes with the first reverse gear 39 and the second reverse gear 40, realizing the reverse gear function. In actual setup, the reverse gear shaft 38 can be rotatably connected to the first side plate 1 and the second side plate 2, the first reverse gear 39 can be slidably connected to the reverse gear shaft 38, the power element can be connected to the first reverse gear 39, and the power element can drive the first reverse gear 39 to slide on the reverse gear shaft 38.

[0065] The power element drives the reverse gear shaft 38 to slide, causing the third drive gear 41 to mesh with the first reverse gear 39 and the second reverse gear 40. The power from the input shaft 3 is transmitted to the countershaft 5 through the third drive gear 41, the first reverse gear 39, and the second reverse gear 40. The countershaft 5 transmits the power to the output shaft 4 through the first intermediate gear 13 mounted thereon, thus achieving reverse gear output. During reverse gear output, it must be ensured that neither of the two countershafts 5 meshes with the first drive gear 6 or the second drive gear 7 through the first transmission gear 11 and the second transmission gear 12. Furthermore, one of the second intermediate gears 26 and the third intermediate gear 27 on the countershaft 5 with the second reverse gear 40 meshes with the fourth output gear 24 or the fifth output gear 25 on the output shaft 4. Therefore, the cyclic gear transmission described in this utility model can solve the problem that the countershaft of existing gear transmissions cannot be adjusted according to torque and speed. Moreover, the multiple gears are arranged in a circular array around the main shaft, which is beneficial for increasing the number of gears and reducing the size of the transmission.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A cyclic gear transmission, characterized in that: The system includes a main shaft, which comprises an input shaft and an output shaft rotatably connected. The input shaft is rotatably connected to a first side plate, and the output shaft is rotatably connected to a second side plate. The input shaft is equipped with several drive gears, and the output shaft is equipped with several output gears. Several secondary shafts are rotatably arranged in a circular array around the main shaft between the first and second side plates. One end of each secondary shaft is equipped with a transmission gear that corresponds to and meshes with the drive gears, and the other end of each secondary shaft is equipped with an intermediate gear that meshes with the output gears. A power structure is provided on the second side plate to drive the transmission gears to slide on the secondary shafts. The power structure drives the transmission gears on the secondary shafts to alternately mesh with the drive gears. The secondary shafts drive the output shaft to rotate through the intermediate gears and the output gears, thereby realizing cyclic gear changes.

2. A cyclic gear transmission according to claim 1, characterized in that: The driving gear includes a first driving gear and a second driving gear, both of which are fixedly mounted on the input shaft. A reverse gear structure is provided on the first side plate. The reverse gear structure includes a reverse gear shaft, which is rotatably and slidably connected to both the first side plate and the second side plate. A first reverse gear is provided at one end of the reverse gear shaft located outside the first side plate, a second reverse gear is provided on one of the countershafts, a third drive gear is provided on the input shaft, and a power element is provided outside the transmission to drive the first reverse gear to slide, so that the third drive gear meshes with the first and second reverse gears.

3. A cyclic gear transmission according to claim 2, characterized in that: The transmission gears include a first transmission gear and a second transmission gear. Both the first and second transmission gears are fixedly mounted on a first sliding sleeve. The first sliding sleeve is slidably mounted on a secondary shaft. A spline is fixedly mounted on the secondary shaft to limit the sliding of the first sliding sleeve along the axial direction of the secondary shaft. The first and second transmission gears mesh with the first and second driving gears respectively and have different transmission ratios. The distance between the first and second driving gears is not less than the distance between the opposing surfaces of the first and second transmission gears.

4. A cyclic gear transmission according to claim 3, characterized in that: The power structure includes a slide rod, which is slidably connected to both the first and second side plates. A limiting block is provided on the slide rod to limit its sliding movement. Limiting holes adapted to the limiting blocks are provided on the first and second side plates. A first fixing sleeve is fixedly mounted on the slide rod, and a first shift fork is fixedly mounted on the first fixing sleeve. The first shift fork is located between the first and second transmission gears. A drive disc coaxial with the main shaft is rotatably mounted on the second side plate. A first annular groove for moving the slide rod is provided on the outer wall of the drive disc. A first roller adapted to the first groove is provided on the slide rod, and the first roller is located within and slides along the first groove.

5. A cyclic gear transmission according to claim 4, characterized in that: The output gears include a first output gear, a second output gear, and a third output gear. There are three countershafts, and a first intermediate gear that meshes with the first output gear, the second output gear, and the third output gear is fixedly mounted on each of the three countershafts. The first intermediate gear has a different transmission ratio with the first output gear, the first intermediate gear has a different transmission ratio with the second output gear, and the first intermediate gear has a different transmission ratio with the third output gear.

6. A cyclic gear transmission according to claim 5, characterized in that: The first groove is provided with a first protrusion and a first groove, and the included angle between the first protrusion and the first groove is not greater than 360° / 2. n , n The number of secondary shafts; when the first roller is located at the top of the first protrusion, the second transmission gear meshes with the second drive gear; when the first roller is located at the bottom of the first groove, the first transmission gear meshes with the first drive gear.

7. A cyclic gear transmission according to claim 3, characterized in that: The power structure includes a slide rod, which is fixedly connected to the first side plate and the second side plate. A first fixed sleeve and a second fixed sleeve are slidably disposed on the slide rod. A limiting block is provided on the slide rod to limit the sliding of the first fixed sleeve and the second fixed sleeve. A limiting groove adapted to the limiting block is provided on the first fixed sleeve and the second fixed sleeve. A first shift fork is fixedly mounted on the first fixed sleeve. The first shift fork is located between the first transmission gear and the second transmission gear. The first transmission gear and the second transmission gear are fixedly mounted on the first sliding sleeve. The first sliding sleeve is slidably mounted on the outside of the sub-shaft. The first side plate and the second side plate are connected by a housing. A drive disk coaxial with the main shaft is rotatably mounted on the inner wall of the housing. A first groove that drives the first fixed sleeve to move is provided on the inner side wall of the drive disk. A first roller that matches the first groove is provided on the first fixed sleeve. The first roller is located in the first groove and slides along the first groove. A second shift fork is fixedly mounted on the second fixed sleeve. The second shift fork is located between the second intermediate gear and the third intermediate gear. The second intermediate gear and the third intermediate gear are fixedly mounted on the second sliding sleeve. The second sliding sleeve is slidably mounted on the outside of the sub-shaft. A second sliding groove is provided on the inner side wall of the drive disc to drive the second fixed sleeve to move. A second roller is provided on the second fixed sleeve to match the second sliding groove. The second roller is located in the second sliding groove and slides along the second sliding groove.

8. A cyclic gear transmission according to claim 7, characterized in that: The output gears include a fourth output gear and a fifth output gear. There are two countershafts. The second intermediate gear and the third intermediate gear are slidably disposed at one end of the countershaft near the output shaft. The second intermediate gear and the third intermediate gear mesh with the fourth output gear and the fifth output gear, respectively. The second intermediate gear and the fourth output gear, and the third intermediate gear and the fifth output gear have different transmission ratios.

9. A cyclic gear transmission according to claim 8, characterized in that: The first slide includes a first straight section and a first shift section. The length of the first straight section is not less than the length of the first shift section projected onto the first straight section. The first shift section includes a second convex groove and a second groove that are smoothly connected. The second convex groove and the second groove are located on both sides of the first straight section.

10. A cyclic gear transmission according to claim 9, characterized in that: The second slide includes a second straight section and a second shift section. The second straight section corresponds to the first straight section. The second shift section includes two sets of shift sections that are smoothly connected. Each set of shift sections includes a third convex groove and a third recess that are smoothly connected. The third convex groove and the third recess are located on the upper and lower sides of the second straight section and are spaced apart. The two sets of shift sections correspond to the second convex groove and the second recess, respectively.

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