Transmission system and transmission method

Abstract

The present invention belongs to the technical field of vehicles, and discloses a transmission system and a transmission method. The transmission system includes an input shaft, an output shaft, a planetary gear train assembly, a first transmission assembly, a second transmission assembly, and a third transmission assembly. The planetary gear train assembly includes a first sun gear, a planetary gear, a ring gear, a planet carrier, and a second sun gear. The first transmission assembly includes a hydrostatic unit, and the hydrostatic unit can adjust the transmission ratio between the input shaft and the second sun gear. The input end of the second transmission assembly is drivingly connected to the input shaft, and the output end is selectively drivingly connected to the first sun gear and the ring gear respectively. The planet carrier is drivingly connected to a first output gear and a second output gear, and both the first output gear and the second output gear are selectively drivingly connected to the output shaft. The planet carrier can drive the output shaft to rotate in a first direction through the first output gear, and can drive the output shaft to rotate in a second direction opposite to the first direction through the second output gear.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular, to a transmission system and a transmission method. Background Art

[0002] At present, manual transmissions are still mainly used in tractors in China. The proportion of power shift tractors in the country is less than 1%. Manual tractors are still the main form of tractors in China. During actual operation, both manual transmission tractors and power shift transmission tractors require the driver to select gears according to the actual working conditions, which increases the labor intensity of the driver. On the other hand, for large-horsepower tractors to achieve a large transmission ratio in the transmission, the number of transmission gears often exceeds 20, which increases the difficulty of driving the tractor and the labor intensity of the driver.

[0003] Therefore, there is an urgent need for a transmission system and a transmission method to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a transmission system and a transmission method, which have multiple speed segments in both opposite directions, and the number of speed segments in both opposite directions is the same. In addition, each speed segment is steplessly adjustable, reducing the number of gear shifts and the labor intensity.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A transmission system, comprising:

[0007] An input shaft, which can rotate under the drive of an engine;

[0008] An output shaft, which is used to output power;

[0009] A planetary gear train assembly, which includes a first sun gear, planetary gears, a ring gear, a planet carrier, and a second sun gear. The first sun gear is drivingly connected to the ring gear through the planetary gears, and the second sun gear is drivingly connected to the planetary gears;

[0010] A first transmission component, which includes a hydrostatic unit. The input end of the first transmission component is drivingly connected to the input shaft, and the output end is drivingly connected to the second sun gear. The hydrostatic unit can adjust the transmission ratio between the input shaft and the second sun gear;

[0011] A second transmission component, whose input end is drivingly connected to the input shaft, and the output end is selectively drivingly connected to the first sun gear and the ring gear respectively. Both the first sun gear and the ring gear can cooperate with the second sun gear to drive the planet carrier to rotate;

[0012] The third transmission assembly includes a first output gear and a second output gear. The planet carrier is in transmission connection with the first output gear and the second output gear. The first output gear and the second output gear are selectively in transmission connection with the output shaft. The planet carrier can drive the output shaft to rotate in a first direction through the first output gear and can drive the output shaft to rotate in a second direction opposite to the first direction through the second output gear.

[0013] Preferably, the first transmission assembly further includes a first transmission gear, a second transmission gear, a third transmission gear and a first transmission shaft. The first transmission gear is in transmission connection with the input shaft. The input end of the hydrostatic unit is connected to the first transmission gear, and the output end is connected to the second transmission gear. The second sun gear and the third transmission gear are both fixed on the first transmission shaft, and the third transmission gear meshes with the second transmission gear.

[0014] Preferably, a plurality of hydrostatic units are provided, and the first transmission gear and the second transmission gear are respectively arranged in one-to-one correspondence with the hydrostatic units.

[0015] Preferably, the third transmission assembly includes a fourth transmission gear, a fifth transmission gear, a second transmission shaft, a first idler gear, a first clutch and a second clutch. The planet carrier is in transmission connection with the fourth transmission gear. The fourth transmission gear is connected to the fifth transmission gear through the second transmission shaft. The fourth transmission gear meshes with the first output gear. The fifth transmission gear is in transmission connection with the second output gear through the first idler gear. The first clutch is respectively connected to the first output gear and the output shaft to link or separate the first output gear and the output shaft. The second clutch is respectively connected to the second output gear and the output shaft to link or separate the second output gear and the output shaft.

[0016] Preferably, it further includes a sixth transmission gear. The sixth transmission gear is rotatably arranged on the first transmission shaft and is fixedly connected to the planet carrier. The fourth transmission gear meshes with the sixth transmission gear.

[0017] Preferably, the second transmission assembly includes a first shift gear, a third clutch, a third transmission shaft and a seventh transmission gear. The first shift gear is rotatably arranged on the input shaft. The third clutch is respectively connected to the first shift gear and the input shaft to link or separate the first shift gear and the input shaft. The first sun gear is fixed on the third transmission shaft, and the seventh transmission gear is fixed on the third transmission shaft. The first shift gear meshes with the seventh transmission gear.

[0018] Preferably, the second transmission assembly further includes a second shift gear, a fourth clutch, and an eighth transmission gear. The second shift gear is rotatably disposed on the input shaft. The fourth clutch is respectively connected to the second shift gear and the input shaft to link or separate the second shift gear from the input shaft. The eighth transmission gear is rotatably disposed on the third transmission shaft. The second shift gear meshes with the eighth transmission gear, and the eighth transmission gear is fixedly connected to the ring gear.

[0019] Preferably, the second transmission assembly further includes a third shift gear and a fifth clutch. The third shift gear is rotatably disposed on the third transmission shaft. The third shift gear is in transmission connection with the input shaft. The fifth clutch is respectively connected to the third shift gear and the third transmission shaft to link or separate the third shift gear from the third transmission shaft.

[0020] Preferably, a fourth transmission assembly is further included. The fourth transmission assembly includes a third output gear in transmission connection with the input shaft, and the third output gear is used for outputting power.

[0021] A transmission method uses the transmission system described in any one of the above to perform transmission.

[0022] Advantages of the present invention:

[0023] For the transmission system and transmission method provided by the present invention, the power input through the input shaft is partly transmitted to the second sun gear through the first transmission assembly, and the other part is transmitted to the first sun gear or the ring gear through the second transmission assembly. The first sun gear or the ring gear and the second sun gear jointly drive the planet carrier to rotate, so that the power transmitted through the first transmission assembly and the power transmitted through the second transmission assembly are converged at the planet carrier, and then are transmitted to the output shaft through the first output gear of the third transmission assembly for output, or are transmitted to the output shaft through the second output gear of the third transmission assembly for output. By controlling the transmission path of the power transmitted through the second transmission assembly within the second transmission assembly, the transmission system provided by the present invention can have multiple speed segments, and by adjusting the transmission ratio between the input shaft and the second sun gear through the hydrostatic unit, the rotation speed of the planet carrier can be steplessly adjusted within each speed segment, greatly reducing the number of gear shifts and lowering the labor intensity. In addition, since the rotation direction of the output shaft is opposite when the planet carrier drives the output shaft through the first output gear and when it drives the output shaft through the second output gear, the transmission system provided in this embodiment has multiple speed segments in both opposite directions, the number of speed segments in the two opposite directions is the same, and there is a large rotation speed adjustment range in both opposite directions. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the transmission system provided by an embodiment of the present invention.

[0025] In the figure:

[0026] 1. Input shaft;

[0027] 2. Output shaft;

[0028] 3. Planetary gear train assembly; 31. First sun gear; 32. Planet gear; 33. Ring gear; 34. Planet carrier; 35. Second sun gear; 36. Second idler gear;

[0029] 4. First transmission assembly; 41. Hydrostatic unit; 42. First transmission gear; 43. Second transmission gear; 44. Third transmission gear; 45. First transmission shaft;

[0030] 5. Second transmission assembly; 51. First shift gear; 52. Third clutch; 53. Third transmission shaft; 54. Seventh transmission gear; 55. Second shift gear; 56. Fourth clutch; 57. Eighth transmission gear; 58. Third shift gear; 59. Fifth clutch;

[0031] 6. Third transmission assembly; 61. First output gear; 62. Second output gear; 63. Fourth transmission gear; 64. Fifth transmission gear; 65. Second transmission shaft; 66. First idler gear; 67. First clutch; 68. Second clutch;

[0032] 7. Sixth transmission gear;

[0033] 8. Fourth transmission assembly; 81. Third output gear; 82. Ninth transmission gear;

[0034] 9. Tenth transmission gear;

[0035] 100. Engine. Detailed implementation mode

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention rather than all structures are shown in the drawings.

[0037] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include contact between the first and second features not directly but through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0039] In the description of this embodiment, the orientation or positional relationships such as "up", "down", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] As Figure 1 shown, this embodiment provides a transmission system, for example, used in a vehicle. The transmission system includes an input shaft 1, an output shaft 2, a planetary gear train assembly 3, a first transmission assembly 4, a second transmission assembly 5 and a third transmission assembly 6. The input shaft 1 can rotate under the drive of an engine 100. The output shaft 2 is used to output power. The planetary gear train assembly 3 includes a first sun gear 31, planetary gears 32, a ring gear 33, a planet carrier 34 and a second sun gear 35. The first sun gear 31 is drivingly connected to the ring gear 33 via the planetary gears 32, and the second sun gear 35 is drivingly connected to the planetary gears 32. The first transmission assembly 4 includes a hydrostatic unit 41. The input end of the first transmission assembly 4 is drivingly connected to the input shaft 1, and the output end is drivingly connected to the second sun gear 35. The hydrostatic unit 41 can adjust the transmission ratio between the input shaft 1 and the second sun gear 35. The input end of the second transmission assembly 5 is drivingly connected to the input shaft 1, and the output end is selectively drivingly connected to the first sun gear 31 and the ring gear 33 respectively. Both the first sun gear 31 and the ring gear 33 can cooperate with the second sun gear 35 to jointly drive the planet carrier 34 to rotate. The third transmission assembly 6 includes a first output gear 61 and a second output gear 62. The planet carrier 34 is drivingly connected to the first output gear 61 and the second output gear 62. The first output gear 61 and the second output gear 62 are selectively drivingly connected to the output shaft 2. The planet carrier 34 can drive the output shaft 2 to rotate in a first direction through the first output gear 61, and can drive the output shaft 2 to rotate in a second direction opposite to the first direction through the second output gear 62.

[0041] The transmission system provided in this embodiment, for the power input through the input shaft 1, a part of the power is transmitted to the second sun gear 35 through the first transmission component 4, and another part of the power is transmitted to the first sun gear 31 or the ring gear 33 through the second transmission component 5. The first sun gear 31 or the ring gear 33 and the second sun gear 35 jointly drive the planet carrier 34 to rotate, so as to converge the power transmitted through the first transmission component 4 and the power transmitted through the second transmission component 5 at the planet carrier 34, and then transmit it to the output shaft 2 through the first output gear 61 of the third transmission component 6 for output, or transmit it to the output shaft 2 through the second output gear 62 of the third transmission component 6 for output. By controlling the transmission path of the power transmitted through the second transmission component 5 within the second transmission component 5, the transmission system provided in this embodiment can have different speed segments, and by adjusting the transmission ratio between the input shaft 1 and the second sun gear 35 through the hydrostatic unit 41, the rotation speed of the planet carrier 34 can be steplessly adjusted within each speed segment, greatly reducing the number of gear shifts and lowering the labor intensity. In addition, since the rotation direction of the output shaft 2 is opposite when the planet carrier 34 drives the output shaft 2 through the first output gear 61 and when it drives the output shaft 2 through the second output gear 62, the transmission system provided in this embodiment has multiple speed segments in both opposite directions, the number of speed segments in the two opposite directions is the same, and there is a large rotation speed adjustment range in both opposite directions.

[0042] Specifically, the hydrostatic unit 41 makes the output rotation speed of the hydrostatic unit 41 steplessly adjustable for the speeds of each speed segment and the power continuous without interruption by changing the swash angle of its own hydraulic pump, and the swash angle of the hydraulic pump can change continuously during the switching process between different speed segments, reducing the wear of the clutch during the switching process between different speed segments, improving the service life of the gearbox, and at the same time reducing the gear shift shock and enhancing the driving experience. It is a prior art in the field for the hydrostatic unit 41 to change the output rotation speed of the hydrostatic unit 41 by changing the swash angle of its own hydraulic pump, and the specific principle will not be elaborated here.

[0043] Optionally, the planetary gear train assembly 3 further includes a second idler gear 36. The second idler gear 36 is rotatably arranged on the planet carrier 34. Both the second sun gear 35 and the planetary gear 32 are meshed with the second idler gear 36. By providing the second idler gear 36, the power transmitted to the second sun gear 35 can converge with the power transmitted to the first sun gear 31 or the ring gear 33 to jointly drive the planet carrier 34 to rotate. There are multiple second idler gears 36, and the multiple second idler gears 36 are arranged at intervals along the circumferential direction of the second sun gear 35.

[0044] Optionally, the first transmission assembly 4 further includes a first transmission gear 42, a second transmission gear 43, a third transmission gear 44, and a first transmission shaft 45. The first transmission gear 42 is in transmission connection with the input shaft 1. The input end of the hydrostatic unit 41 is connected to the first transmission gear 42, and the output end is connected to the second transmission gear 43. Both the second sun gear 35 and the third transmission gear 44 are fixedly provided on the first transmission shaft 45, and the third transmission gear 44 meshes with the second transmission gear 43. Part of the power input through the input shaft 1 is input into the hydrostatic unit 41 through the first transmission gear 42, and then is transmitted to the second sun gear 35 through the second transmission gear 43, the third transmission gear 44, and the first transmission shaft 45.

[0045] Further, the transmission system provided in this embodiment further includes a tenth transmission gear 9. The tenth transmission gear 9 is fixedly provided on the input shaft 1, and the first transmission gear 42 meshes with the tenth transmission gear 9, so as to realize the transmission connection between the input shaft 1 and the first transmission gear 42 through the tenth transmission gear 9.

[0046] Optionally, multiple hydrostatic units 41 are provided in the first transmission assembly 4. The first transmission gear 42 and the second transmission gear 43 are both provided in one-to-one correspondence with the hydrostatic unit 41 to enhance the adjustment ability of the first transmission unit 4 for the transmission ratio between the input shaft 1 and the second sun gear 35. Specifically, in this embodiment, two hydrostatic units 41 are provided, and in other embodiments, the number of the hydrostatic units 41 can be adjusted according to needs.

[0047] Optionally, the third transmission assembly 6 includes a fourth transmission gear 63, a fifth transmission gear 64, a second transmission shaft 65, a first idler gear 66, a first clutch 67, and a second clutch 68. The planet carrier 34 is drivingly connected to the fourth transmission gear 63. The fourth transmission gear 63 is connected to the fifth transmission gear 64 through the second transmission shaft 65. The fourth transmission gear 63 meshes with the first output gear 61. The fifth transmission gear 64 is drivingly connected to the second output gear 62 through the first idler gear 66. The first clutch 67 is respectively connected to the first output gear 61 and the output shaft 2 to link or separate the first output gear 61 and the output shaft 2. The second clutch 68 is respectively connected to the second output gear 62 and the output shaft 2 to link or separate the second output gear 62 and the output shaft 2. By providing the first idler gear 66 between the fifth transmission gear 64 and the second output gear 62, the rotation direction of the second output gear 62 is opposite to that of the first output gear 61. By controlling the first clutch 67 and the second clutch 68, the output shaft 2 is drivingly connected to the first output gear 61, enabling the output shaft 2 to rotate in a first direction. When the output shaft 2 is drivingly connected to the second output gear 62, the output shaft 2 can rotate in a second direction opposite to the first direction. Specifically, in this embodiment, both the first clutch 67 and the second clutch 68 are jaw clutches, which can reduce power loss compared to friction plate clutches. In other embodiments, the first clutch 67 and the second clutch 68 can be replaced with friction plate clutches or other shifting mechanisms such as synchronizers and engagement sleeves to achieve the same function.

[0048] Optionally, the transmission system provided in this embodiment further includes a sixth transmission gear 7. The sixth transmission gear 7 is rotatably disposed on the first transmission shaft 45. The sixth transmission gear 7 is fixedly connected to the planet carrier 34. The fourth transmission gear 63 meshes with the sixth transmission gear 7. The driving connection between the planet carrier 34 and the fourth transmission gear 63 of the third transmission assembly 6 is achieved by providing the sixth transmission gear 7.

[0049] Optionally, the second transmission assembly 5 includes a first shifting gear 51, a third clutch 52, a third transmission shaft 53, and a seventh transmission gear 54. The first shifting gear 51 is rotatably disposed on the input shaft 1. The third clutch 52 is respectively connected to the first shifting gear 51 and the input shaft 1 to link or separate the first shifting gear 51 and the input shaft 1. The first sun gear 31 is fixedly disposed on the third transmission shaft 53. The seventh transmission gear 54 is fixedly disposed on the third transmission shaft 53. The first shifting gear 51 meshes with the seventh transmission gear 54. The ring gear 33 is rotatably disposed on the third transmission shaft 53.

[0050] Optionally, the second transmission assembly 5 further includes a second shift gear 55, a fourth clutch 56, and an eighth transmission gear 57. The second shift gear 55 is rotatably arranged on the input shaft 1. The fourth clutch 56 is respectively connected to the second shift gear 55 and the input shaft 1 to link or separate the second shift gear 55 from the input shaft 1. The eighth transmission gear 57 is rotatably arranged on the third transmission shaft 53. The second shift gear 55 meshes with the eighth transmission gear 57, and the eighth transmission gear 57 is fixedly connected to the ring gear 33.

[0051] Optionally, the second transmission assembly 5 further includes a third shift gear 58 and a fifth clutch 59. The third shift gear 58 is rotatably arranged on the third transmission shaft 53. The third shift gear 58 is in transmission connection with the input shaft 1. The fifth clutch 59 is respectively connected to the third shift gear 58 and the third transmission shaft 53 to link or separate the third shift gear 58 from the third transmission shaft 53.

[0052] Further, the third shift gear 58 meshes with the tenth transmission gear 9, thereby realizing the transmission connection between the third shift gear 58 and the input shaft 1.

[0053] Optionally, the transmission system provided in this embodiment further includes a fourth transmission assembly 8. The fourth transmission assembly 8 includes a third output gear 81 in transmission connection with the input shaft 1, and the third output gear 81 is used for power output.

[0054] In this embodiment, the fourth transmission assembly 8 further includes a ninth transmission gear 82. The ninth transmission gear 82 is fixedly arranged on the input shaft 1 and meshes with the third output gear 81.

[0055] This embodiment also provides a transmission method, using the above-mentioned transmission system for transmission.

[0056] The transmission method provided in this embodiment has three forward speed segment modes, three reverse speed segment modes, and a PTO power output mode. The three forward speed segment modes are used for forward movement, and the three reverse speed segment modes are used for reverse movement. The three forward speed segment modes are respectively the first forward mode, the second forward mode, and the third forward mode. The three reverse speed segment modes are respectively the first reverse mode, the second reverse mode, and the third reverse mode. The switching between different speed segments is controlled by the engagement and disengagement of the corresponding clutches. The hydrostatic unit 41 is involved in each speed segment. By changing the swash angle of the hydraulic pump in the hydrostatic unit 41, stepless adjustment of the speed within each speed segment and continuous power without interruption are achieved. Moreover, the swash angle of the hydrostatic unit can change continuously during the switching between different speed segments, reducing the wear of the clutch during the switching between different speed segments, improving the service life of the gearbox, and at the same time reducing the shift shock and providing a driving experience.

[0057] The specific transmission method for each speed segment is as follows:

[0058] Forward first gear mode: In this mode, both the first clutch 67 and the third clutch 52 are engaged, and the fourth clutch 56, the fifth clutch 59, and the second clutch 68 are all disengaged. A part of the power input by the engine 100 through the input shaft 1 is transmitted to the first sun gear 31 in the planetary gear train assembly 3 via the input shaft 1 - the third clutch 52 - the first shift gear 51 - the seventh transmission gear 54; Another part of the power input by the engine 100 through the input shaft 1 is transmitted to the second sun gear 35 in the planetary gear train assembly 3 via the tenth transmission gear 9 - the first transmission gear 42 - the hydrostatic unit 41 - the second transmission gear 43 - the third transmission gear 44; The power of the first sun gear 31 and the second sun gear 35 is coupled in the planetary gear train assembly 3 and then transmitted to the sixth transmission gear 7 through the planet carrier 34, and finally transmitted to the front axle and the rear axle of the whole vehicle via the fourth transmission gear 63 - the first output gear 61 - the first clutch 67.

[0059] Forward second gear mode: In this mode, both the first clutch 67 and the fourth clutch 56 are engaged, and the third clutch 52, the fifth clutch 59, and the second clutch 68 are all disengaged. A part of the power input by the engine 100 through the input shaft 1 is input to the ring gear 33 in the planetary gear train assembly 3 via the input shaft 1 - the fourth clutch 56 - the second shift gear 55 - the eighth transmission gear 57; Another part of the power input by the engine 100 through the input shaft 1 is transmitted to the second sun gear 35 in the planetary gear train assembly 3 via the tenth transmission gear 9 - the first transmission gear 42 - the hydrostatic unit 41 - the second transmission gear 43 - the third transmission gear 44; The power of the ring gear 33 and the second sun gear 35 is coupled in the planetary gear train assembly 3 and then transmitted to the sixth transmission gear 7 through the planet carrier 34, and finally transmitted to the front axle and the rear axle of the whole vehicle via the fourth transmission gear 63 - the first output gear 61 - the first clutch 67.

[0060] Forward third gear mode: In this mode, both the first clutch 67 and the fifth clutch 59 are engaged, and the third clutch 52, the fourth clutch 56, and the second clutch 68 are all disengaged. A part of the power input by the engine 100 through the input shaft 1 is transmitted to the first sun gear 31 in the planetary gear train assembly 3 via the input shaft 1 - the tenth transmission gear 9 - the third shift gear 58 - the third clutch 52; Another part of the power input by the engine 100 through the input shaft 1 is transmitted to the second sun gear 35 in the planetary gear train assembly 3 via the tenth transmission gear 9 - the first transmission gear 42 - the hydrostatic unit 41 - the second transmission gear 43 - the third transmission gear 44; The power of the first sun gear 31 and the second sun gear 35 is coupled in the planetary gear train assembly 3 and then transmitted to the sixth transmission gear 7 through the planet carrier 34, and finally transmitted to the front axle and the rear axle of the whole vehicle via the fourth transmission gear 63 - the first output gear 61 - the first clutch 67.

[0061] Reverse first gear mode: In this mode, the first clutch 67 and the third clutch 52 are both engaged, and the fourth clutch 56, the fifth clutch 59, and the second clutch 68 are all disengaged. A part of the power input by the engine 100 through the input shaft 1 is transmitted to the first sun gear 31 in the planetary gear train assembly 3 via the input shaft 1 - the third clutch 52 - the first shift gear 51 - the seventh transmission gear 54; Another part of the power input by the engine 100 through the input shaft 1 is transmitted to the second sun gear 35 in the planetary gear train assembly 3 via the tenth transmission gear 9 - the first transmission gear 42 - the hydrostatic unit 41 - the second transmission gear 43 - the third transmission gear 44; The power of the first sun gear 31 and the second sun gear 35 is coupled in the planetary gear train assembly 3 and then transmitted to the sixth transmission gear 7 through the planet carrier 34, and finally transmitted to the front axle and the rear axle of the whole vehicle via the fourth transmission gear 63 - the fifth transmission gear 64 - the first idler gear 66 - the second output gear 62 - the second clutch 68.

[0062] Reverse second gear mode: In this mode, the first clutch 67 and the fourth clutch 56 are both engaged, and the third clutch 52, the fifth clutch 59, and the second clutch 68 are all disengaged. A part of the power input by the engine 100 through the input shaft 1 is input to the ring gear 33 in the planetary gear train assembly 3 via the input shaft 1 - the fourth clutch 56 - the second shift gear 55 - the eighth transmission gear 57; Another part of the power input by the engine 100 through the input shaft 1 is transmitted to the second sun gear 35 in the planetary gear train assembly 3 via the tenth transmission gear 9 - the first transmission gear 42 - the hydrostatic unit 41 - the second transmission gear 43 - the third transmission gear 44; The power of the ring gear 33 and the second sun gear 35 is coupled in the planetary gear train assembly 3 and then transmitted to the sixth transmission gear 7 through the planet carrier 34, and finally transmitted to the front axle and the rear axle of the whole vehicle via the fourth transmission gear 63 - the fifth transmission gear 64 - the first idler gear 66 - the second output gear 62 - the second clutch 68.

[0063] Reverse three-stage mode: In this mode, both the first clutch 67 and the fifth clutch 59 are engaged, while the third clutch 52, the fourth clutch 56, and the second clutch 68 are disengaged. A part of the power input by the engine 100 via the input shaft 1 is transmitted to the first sun gear 31 in the planetary gear train assembly 3 through the input shaft 1 - the tenth transmission gear 9 - the third shift gear 58 - the third clutch 52; another part of the power input by the engine 100 via the input shaft 1 is transmitted to the second sun gear 35 in the planetary gear train assembly 3 through the tenth transmission gear 9 - the first transmission gear 42 - the hydrostatic unit 41 - the second transmission gear 43 - the third transmission gear 44; the power of the first sun gear 31 and the second sun gear 35 is coupled in the planetary gear train assembly 3 and then transmitted to the sixth transmission gear 7 through the planet carrier 34, and finally transmitted to the front axle and rear axle of the vehicle through the fourth transmission gear 63 - the fifth transmission gear 64 - the first idler gear 66 - the second output gear 62 - the second clutch 68.

[0064] The transmission method of the PTO power output mode is as follows:

[0065] The power input by the engine 100 via the input shaft 1 is directly output through the input shaft 1 - the ninth transmission gear 82 - the third output gear 83.

[0066] Among them, the PTO power output mode refers to: power take-off of vehicle power output, a device for transmitting rotational power from the rear of the vehicle to agricultural implements.

[0067] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Transmission system, characterized in that, Comprising: An input shaft (1) that can rotate under the drive of an engine (100); An output shaft (2) for outputting power; A planetary gear train assembly (3) including a first sun gear (31), planetary gears (32), a ring gear (33), a planet carrier (34), and a second sun gear (35). The first sun gear (31) is in transmission connection with the ring gear (33) via the planetary gears (32), and the second sun gear (35) is in transmission connection with the planetary gears (32); A first transmission assembly (4) including a hydrostatic unit (41). The input end of the first transmission assembly (4) is in transmission connection with the input shaft (1), and the output end is in transmission connection with the second sun gear (35). The hydrostatic unit (41) can adjust the transmission ratio between the input shaft (1) and the second sun gear (35); A second transmission assembly (5) whose input end is in transmission connection with the input shaft (1), and the output end is selectively in transmission connection with the first sun gear (31) and the ring gear (33) respectively. Both the first sun gear (31) and the ring gear (33) can cooperate with the second sun gear (35) to jointly drive the planet carrier (34) to rotate; A third transmission assembly (6) including a first output gear (61) and a second output gear (62). The planet carrier (34) is in transmission connection with the first output gear (61) and the second output gear (62). The first output gear (61) and the second output gear (62) are selectively in transmission connection with the output shaft (2). The planet carrier (34) can drive the output shaft (2) to rotate in a first direction through the first output gear (61), and can drive the output shaft (2) to rotate in a second direction opposite to the first direction through the second output gear (62); The second transmission assembly (5) includes a first shift gear (51), a third clutch (52), a third transmission shaft (53), and a seventh transmission gear (54). The first shift gear (51) is rotatably arranged on the input shaft (1). The third clutch (52) is respectively connected to the first shift gear (51) and the input shaft (1) to link or separate the first shift gear (51) and the input shaft (1). The first sun gear (31) is fixed on the third transmission shaft (53), and the seventh transmission gear (54) is fixed on the third transmission shaft (53). The first shift gear (51) meshes with the seventh transmission gear (54); The second transmission assembly (5) further includes a second shift gear (55), a fourth clutch (56), and an eighth transmission gear (57). The second shift gear (55) is rotatably disposed on the input shaft (1). The fourth clutch (56) is respectively connected to the second shift gear (55) and the input shaft (1) to link or separate the second shift gear (55) from the input shaft (1). The eighth transmission gear (57) is rotatably disposed on the third transmission shaft (53). The second shift gear (55) meshes with the eighth transmission gear (57), and the eighth transmission gear (57) is fixedly connected to the ring gear (33). The second transmission assembly (5) further includes a third shift gear (58) and a fifth clutch (59). The third shift gear (58) is rotatably disposed on the third transmission shaft (53). The third shift gear (58) is in transmission connection with the input shaft (1). The fifth clutch (59) is respectively connected to the third shift gear (58) and the third transmission shaft (53) to link or separate the third shift gear (58) from the third transmission shaft (53).

2. The transmission system according to claim 1, characterized in that, The first transmission assembly (4) further includes a first transmission gear (42), a second transmission gear (43), a third transmission gear (44), and a first transmission shaft (45). The first transmission gear (42) is in transmission connection with the input shaft (1). The input end of the hydrostatic unit (41) is connected to the first transmission gear (42), and the output end is connected to the second transmission gear (43). Both the second sun gear (35) and the third transmission gear (44) are fixedly disposed on the first transmission shaft (45). The third transmission gear (44) meshes with the second transmission gear (43).

3. The transmission system according to claim 2, characterized in that, A plurality of hydrostatic units (41) are provided, and the first transmission gear (42) and the second transmission gear (43) are respectively provided in one-to-one correspondence with the hydrostatic units (41).

4. The transmission system according to claim 2, characterized in that, The third transmission assembly (6) includes a fourth transmission gear (63), a fifth transmission gear (64), a second transmission shaft (65), a first idler gear (66), a first clutch (67), and a second clutch (68). The planet carrier (34) is in transmission connection with the fourth transmission gear (63). The fourth transmission gear (63) is connected to the fifth transmission gear (64) through the second transmission shaft (65). The fourth transmission gear (63) meshes with the first output gear (61). The fifth transmission gear (64) is in transmission connection with the second output gear (62) through the first idler gear (66). The first clutch (67) is respectively connected to the first output gear (61) and the output shaft (2) to link or separate the first output gear (61) from the output shaft (2). The second clutch (68) is respectively connected to the second output gear (62) and the output shaft (2) to link or separate the second output gear (62) from the output shaft (2).

5. The transmission system according to claim 4, characterized in that, It further includes a sixth transmission gear (7), the sixth transmission gear (7) is rotatably arranged on the first transmission shaft (45), the sixth transmission gear (7) is fixedly connected to the planet carrier (34), and the fourth transmission gear (63) meshes with the sixth transmission gear (7).

6. The transmission system according to claim 1, characterized in that, It further includes a fourth transmission assembly (8), the fourth transmission assembly (8) includes a third output gear (81) in transmission connection with the input shaft (1), and the third output gear (81) is used for outputting power.

7. Transmission method, characterized in that, Use the transmission system according to any one of claims 1-6 for transmission.

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