Hydraulic continuously variable transmission

Abstract

The utility model discloses a hydraulic continuously variable transmission which comprises a mounting box, an input gear and a first gear fixedly arranged on a first output shaft, a pump motor connected with a pump transmission shaft and a sun wheel shaft, a second gear fixedly arranged on the pump transmission shaft, a third gear fixedly arranged on the sun wheel shaft, and a fourth gear and a fifth gear rotationally arranged on a second output shaft. The input shaft is connected with the first output shaft, the first installation frame assembly is in transmission connection with the input gear, the second installation frame assembly and the sun wheel shaft, the first installation frame assembly is connected with the second output shaft through the low-gear clutch assembly, and the second installation frame assembly is in transmission connection with the sun wheel shaft and the fifth gear. The direct gear clutch assembly is arranged on the second output shaft and located between the fourth gear and the fifth gear, the first gear is meshed with the second gear, and the third gear is meshed with the fourth gear. The hydraulic continuously variable transmission can meet the high-power transmission requirement, and is high in adaptability, large in bearing torque and wide in transmission range.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, specifically to a hydraulic continuously variable transmission (CVT). Background Technology

[0002] Existing continuously variable transmissions (CVTs) generally achieve stepless speed regulation through mechanical transmission, which has a relatively low torque capacity, narrow transmission range, and low transmission power. Some CVTs employ a combination of mechanical and hydraulic transmissions, creating a coupling between mechanical and hydraulic flows to achieve stepless speed regulation. However, on the one hand, the overall structural design is often unreasonable, with only one coupling method between the mechanical and hydraulic flows, resulting in a narrow adjustment range, limited transmission ratio, and inability to meet high-power transmission requirements, leading to poor adaptability. On the other hand, the transmission components are typically installed in one or two compartments, resulting in high transmission torque and inconvenient disassembly and assembly. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a hydraulic continuously variable transmission with a wide adjustment range, capable of meeting the requirements of high-power transmission, strong adaptability, large torque capacity, and wide transmission range.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A hydraulic continuously variable transmission (CVT) includes a mounting housing. The mounting housing houses an input shaft, a first output shaft, a second output shaft, a pump motor, a pump drive shaft, a sun gear shaft, a first mounting bracket assembly, a second mounting bracket assembly, a low-speed clutch assembly, and a direct-drive clutch assembly. An input gear and a first gear are fixedly mounted on the first output shaft. The input interface of the pump motor is connected to the pump drive shaft, and the output interface of the pump motor is connected to the sun gear shaft. A second gear is fixedly mounted on the pump drive shaft, and a third gear is fixedly mounted on the sun gear shaft. A fourth gear and a fifth gear are rotatably mounted on the second output shaft. The input shaft is connected to the first output shaft. The first mounting bracket assembly is driven by the input gear, the second mounting bracket assembly, and the sun gear shaft. The first mounting bracket assembly is connected to the second output shaft via the low-speed clutch assembly. The second mounting bracket assembly is driven by the sun gear shaft and the fifth gear. The direct-drive clutch assembly is located on the second output shaft and between the fourth and fifth gears. The first gear meshes with the second gear, and the third gear meshes with the fourth gear.

[0006] As a further improvement to the above technical solution:

[0007] The first mounting bracket assembly includes a first drive shaft, a first drive gear, a first mounting bracket, and a first planetary gear. The first drive shaft is disposed inside a mounting box. The first mounting bracket is rotatably sleeved on the first drive shaft. A first gear ring and a third drive gear are fixed on the first mounting bracket. A second drive gear is fixed on the sun gear shaft. The first drive gear is fixed on the first drive shaft and meshes with an input gear. The first planetary gear is disposed on the first drive shaft and meshes with the first gear ring and the second drive gear, respectively. The second mounting bracket assembly is disposed on the first drive shaft. The third drive gear is connected to the low-speed clutch assembly.

[0008] The second mounting bracket assembly includes a second mounting bracket and a second planetary gear. A second gear ring is provided on the first drive shaft. The second mounting bracket is rotatably sleeved on the sun gear shaft. The second planetary gear is provided on the second mounting bracket and meshes with the second gear ring and the fourth drive gear respectively. A fifth drive gear is fixed on the second mounting bracket and meshes with the fourth gear.

[0009] The low-speed clutch assembly includes a second drive shaft, a low-speed gear, and a low-speed clutch. The second drive shaft is located in a mounting box and is synchronously connected to the second output shaft. The low-speed gear is rotatably mounted on the second drive shaft and meshes with a third drive gear. The low-speed clutch is located on the second drive shaft and is used to engage or disengage with the first drive gear.

[0010] The second drive shaft is coaxial with the second output shaft and is splined together.

[0011] The first drive shaft is coaxial with and rotatably connected to the sun gear shaft.

[0012] The mounting box includes a first box and a second box that are detachably connected. A first chamber is formed inside the first box, a second chamber is formed between the first box and the second box, and a third chamber is formed inside the second box. The input shaft passes through the first chamber, the second chamber, and the third chamber, and the second output shaft passes through the second chamber and the third chamber. The input gear, the first mounting bracket assembly, and the low-speed clutch assembly are all located in the first chamber, and the first gear, the pump drive shaft, the sun gear shaft, the second mounting bracket assembly, the fourth gear, the fifth gear, and the direct drive clutch assembly are all located in the second chamber.

[0013] The input shaft includes a first external shaft and a first connecting shaft. The first external shaft passes through the first chamber and extends out of the first chamber. The first connecting shaft passes through the second chamber and the third chamber. The first external shaft, the first connecting shaft and the first output shaft are coaxial and connected by splines in sequence. The input gear is fixed on the first external shaft and the first gear is fixed on the first connecting shaft.

[0014] The second output shaft includes a second external shaft and a second connecting shaft. The second external shaft passes through the third housing and extends out of the third housing. The second connecting shaft passes through the second housing. The fourth gear and the fifth gear are both rotatably mounted on the second connecting shaft. The direct drive clutch assembly is mounted on the second connecting shaft. The second external shaft and the second connecting shaft are coaxial and splined together.

[0015] The input shaft and the first output shaft are coaxial, and the input shaft, pump drive shaft, sun gear shaft, and second output shaft are parallel.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] This utility model discloses a hydraulic continuously variable transmission (CVT) that employs a combination of mechanical and hydraulic transmission components, forming a convergence and coupling of mechanical and hydraulic flows to achieve stepless speed regulation. The overall structural design is reasonable, with three possible coupling paths between the mechanical and hydraulic flows, resulting in a wide adjustment range, a large transmission ratio, and the ability to meet high-power transmission requirements, demonstrating strong adaptability. Furthermore, it can handle a large torque, has a wide transmission range, and delivers high transmission power. Attached Figure Description

[0018] Figure 1 This is a cross-sectional structural schematic diagram of the hydraulic continuously variable transmission of this utility model.

[0019] Figure 2 yes Figure 1 A magnified structural diagram of point A in the middle.

[0020] The labels in the diagram represent:

[0021] 1. First housing; 11. First mounting bracket assembly; 111. First drive shaft; 112. First mounting bracket; 113. First planetary gear; 114. First gear ring; 115. Third drive gear; 116. Second gear ring; 12. Low-speed clutch assembly; 121. Second drive shaft; 122. Low-speed gear; 123. Low-speed clutch; 13. Sun gear shaft; 131. Second drive gear; 132. Fourth drive gear; 14. Direct drive clutch assembly; 15. First gear; 16. Second gear; 17. Pump 18. Drive shaft; 19. Pump motor; 10. Second mounting bracket assembly; 11. Second mounting bracket; 11. Second planetary gear; 2. Second housing; 20. Fifth transmission gear; 21. Fourth gear; 22. Fifth gear; 23. First transmission gear; 24. Second output shaft; 241. Second external shaft; 242. Second connecting shaft; 25. First output shaft; 3. First housing; 4. Second housing; 5. Third housing; 6. Third gear; 7. Input shaft; 71. First external shaft; 72. First connecting shaft; 8. Input gear. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. 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.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Figure 1 and Figure 2This invention illustrates an embodiment of a hydraulic continuously variable transmission (CVT). The CVT includes a mounting housing with an input shaft 7, a first output shaft 25, a second output shaft 24, a pump motor 18, a pump drive shaft 17, a sun gear shaft 13, a first mounting bracket assembly 11, a second mounting bracket assembly 19, a low-speed clutch assembly 12, and a direct-drive clutch assembly 14. An input gear 8 and a first gear 15 are fixedly mounted on the first output shaft 25. The input interface of the pump motor 18 is connected to the pump drive shaft 17, and the output interface of the pump motor 18 is connected to the sun gear shaft 13. A second gear 16 is fixedly mounted on the pump drive shaft 17, and a... The system includes a third gear 6, a fourth gear 21 and a fifth gear 22 rotatably mounted on the second output shaft 24, an input shaft 7 connected to the first output shaft 25, a first mounting bracket assembly 11 connected to the input gear 8, a second mounting bracket assembly 19, and the sun gear shaft 13, respectively. The first mounting bracket assembly 11 is connected to the second output shaft 24 via a low-speed clutch assembly 12. The second mounting bracket assembly 19 is connected to the sun gear shaft 13 and the fifth gear 22, respectively. A direct-drive clutch assembly 14 is mounted on the second output shaft 24 and located between the fourth gear 21 and the fifth gear 22. The first gear 15 meshes with the second gear 16, and the third gear 6 meshes with the fourth gear 21. The direct-drive clutch assembly 14 is used to engage / disengage the fourth gear 21 and the second output shaft 24, and the fifth gear 22 and the second output shaft 24. The low-speed clutch assembly 12 is used to engage / disengage the first mounting bracket assembly 11 and the second output shaft 24.

[0027] When this hydraulic continuously variable transmission is in use, the engine power is transmitted to torque through the input shaft 7, providing three-way power transmission:

[0028] The first power transmission path involves the direct drive clutch assembly 14 engaging with the fourth gear 21 and disengaging from the fifth gear 22. The low-speed clutch assembly 12 separates the first mounting bracket assembly 11 from the second output shaft 24. Power is transmitted to the first mounting bracket assembly 11 via the input gear 8, and then to the second mounting bracket assembly 19 via the first mounting bracket assembly 11. Power is transmitted to the pump drive shaft 17 via the meshing force of the first gear 15 and the second gear 16, which drives the pump motor 18. Both the pump motor 18 and the second mounting bracket assembly 19 transmit power to the sun gear shaft 13, forming a convergence of the first-stage mechanical and hydraulic flows. The power flowing to the sun gear shaft 13 is transmitted to the second output shaft 24 via the meshing of the third gear 6 and the fourth gear 21, and finally, the torque is transmitted to the drive axle.

[0029] The second power transmission path involves the direct drive clutch assembly 14 disengaging from the fourth gear 21 and engaging with the fifth gear 22. The low-speed clutch assembly 12 separates the first mounting bracket assembly 11 from the second output shaft 24. Power is transmitted to the first mounting bracket assembly 11 via the input gear 8. Power is then transmitted to the pump drive shaft 17 via the meshing force of the first gear 15 and the second gear 16, driving the pump motor 18 to operate. The pump motor 18 transmits power to the sun gear shaft 13. Both the sun gear shaft 13 and the first mounting bracket assembly 11 transmit power to the second mounting bracket assembly 19, forming a convergence of the second-stage mechanical and hydraulic flows. The power flowing to the second mounting bracket assembly 19 is transmitted to the second output shaft 24 via the transmission action of the fifth gear 22 and the direct drive clutch assembly 14, and finally, the torque is transmitted to the drive axle.

[0030] The third power transmission path: the direct drive clutch assembly 14 disengages from the fourth gear 21 and the fifth gear 22; the low-speed clutch assembly 12 engages the first mounting bracket assembly 11 with the second output shaft 24; the input shaft 7 transmits power to the input gear 8; the input shaft 7 transmits power to the pump drive shaft 17 through the meshing force of the first gear 15 and the second gear 16, driving the pump motor 18 to work; the pump motor 18 transmits power to the sun gear shaft 13; both the sun gear shaft 13 and the input gear 8 transmit power to the first mounting bracket assembly 11, forming a convergence of the third-stage mechanical and hydraulic flows; the power flowing to the first mounting bracket assembly 11 is transmitted to the second output shaft 24 through the low-speed clutch assembly 12, and finally the torque is transmitted to the drive axle.

[0031] This hydraulic continuously variable transmission (CVT) employs a combination of mechanical and hydraulic transmission, creating a convergence and coupling of mechanical and hydraulic flows to achieve stepless speed regulation. The overall structural design is rational, with three possible coupling paths between the mechanical and hydraulic flows, resulting in a wide adjustment range, a large transmission ratio, and the ability to meet high-power transmission requirements, demonstrating strong adaptability. Furthermore, it can handle a large torque, has a wide transmission range, and delivers high transmission power.

[0032] Further, in this embodiment, the first mounting bracket assembly 11 includes a first drive shaft 111, a first drive gear 23, a first mounting bracket 112, and a first planetary gear 113. The first drive shaft 111 is disposed in the mounting box, and the first mounting bracket 112 is rotatably sleeved on the first drive shaft 111. A first gear ring 114 and a third drive gear 115 are fixed on the first mounting bracket 112. A second drive gear 131 is fixed on the sun gear shaft 13. The first drive gear 23 is fixed on the first drive shaft 111 and meshes with the input gear 8. The first planetary gear 113 is disposed on the first drive shaft 111 and meshes with the first gear ring 114 and the second drive gear 131 respectively. The second mounting bracket assembly 19 is disposed on the first drive shaft 111, and the third drive gear 115 is connected to the low-speed clutch assembly 12.

[0033] Furthermore, in this embodiment, the second mounting bracket assembly 19 includes a second mounting bracket 191 and a second planetary gear 192. A second gear ring 116 is provided on the first transmission shaft 111. The second mounting bracket 191 is rotatably sleeved on the sun gear shaft 13. The second planetary gear 192 is provided on the second mounting bracket 191 and meshes with the second gear ring 116 and the fourth transmission gear 132 respectively. A fifth transmission gear 20 is fixed on the second mounting bracket 191 and meshes with the fourth gear 21.

[0034] Furthermore, the low-speed clutch assembly 12 includes a second drive shaft 121, a low-speed gear 122, and a low-speed clutch 123. The second drive shaft 121 is located in the mounting box and is synchronously rotatably connected to the second output shaft 24. The low-speed gear 122 is rotatably mounted on the second drive shaft 121 and meshes with the third drive gear 115. The low-speed clutch 123 is mounted on the second drive shaft 121 and is used to engage and disengage with the first drive gear 23.

[0035] The first power transmission path involves the direct drive clutch assembly 14 engaging with the fourth gear 21 and disengaging from the fifth gear 22. The low-speed clutch 123 separates the second drive shaft 121 from the first drive gear 23. Power is transmitted to the first drive gear 23 via the input gear 8, and the first drive gear 23 transmits power to the second planetary gear 192 via the first drive shaft 111. Power is transmitted to the pump drive shaft 17 via the meshing force of the first gear 15 and the second gear 16, driving the pump motor 18. Both the pump motor 18 and the second planetary gear 192 transmit power to the sun gear shaft 13, forming a convergence of the first-stage mechanical and hydraulic flows. The power flowing to the sun gear shaft 13 is transmitted to the second output shaft 24 via the meshing transmission of the third gear 6 and the fourth gear 21, and finally, the torque is transmitted to the drive axle.

[0036] The second power transmission path involves the direct drive clutch assembly 14 disengaging from the fourth gear 21 and engaging with the fifth gear 22. The low-speed clutch 123 separates the second drive shaft 121 from the first drive gear 23. Power is transmitted to the first drive gear 23 via the input gear 8, and then to the first drive shaft 111. Power is transmitted to the pump drive shaft 17 via the meshing force of the first gear 15 and the second gear 16, which drives the pump motor 18. The pump motor 18 transmits power to the sun gear shaft 13. Both the sun gear shaft 13 and the first drive shaft 111 transmit power to the second planetary gear 192, forming a convergence of the second-stage mechanical and hydraulic flows. The power flowing to the second planetary gear 192 is transmitted to the second output shaft 24 via the transmission action of the fifth drive gear 20, the fifth gear 22, and the direct drive clutch assembly 14, and finally, the torque is transmitted to the drive axle.

[0037] The third power transmission path: the direct drive clutch assembly 14 disengages from the fourth gear 21 and the fifth gear 22; the low-speed clutch 123 engages the second drive shaft 121 with the first drive gear 23; the input shaft 7 transmits power to the input gear 8, which in turn transmits power to the first drive gear 23; the first gear 15 and the second gear 16 mesh to transmit power to the pump drive shaft 17, which drives the pump motor 18; the pump motor 18 transmits power to the sun gear shaft 13, which in turn transmits power to the first planetary gear 113 via the second drive gear 131; both the first planetary gear 113 and the first drive gear 23 transmit power to the first drive shaft 111, forming a convergence of the third-stage mechanical and hydraulic flows; the power flowing to the first drive shaft 111 is transmitted to the second output shaft 24 via the low-speed clutch assembly 12, and finally, the torque is transmitted to the drive axle.

[0038] Furthermore, in this embodiment, the second drive shaft 121 is coaxial with the second output shaft 24 and is splinedly connected.

[0039] Furthermore, in this embodiment, the first drive shaft 111 is coaxial with and rotatably connected to the sun gear shaft 13.

[0040] Furthermore, in this embodiment, the mounting box includes a detachably connected first box 1 and a second box 2. A first chamber 3 is formed inside the first box 1, a second chamber 4 is formed between the first box 1 and the second box 2, and a third chamber 5 is formed inside the second box 2. An input shaft 7 passes through the first chamber 3, the second chamber 4, and the third chamber 5, and a second output shaft 24 passes through the second chamber 4 and the third chamber 5. An input gear 8, a first mounting bracket assembly 11, and a low-speed clutch assembly 12 are all located in the first chamber 3. A first gear 15, a pump drive shaft 17, a sun gear shaft 13, a second mounting bracket assembly 19, a fourth gear 21, a fifth gear 22, and a direct-drive clutch assembly 14 are all located in the second chamber 4. The transmission components are respectively installed in the first chamber 3, the second chamber 4, and the third chamber 5. Compared to one or two chambers, the drive shaft can be set shorter, the transmission torque is smaller, and it can be assembled and disassembled in three chambers, making assembly and disassembly more convenient.

[0041] Furthermore, in this embodiment, the input shaft 7 includes a first external shaft 71 and a first connecting shaft 72. The first external shaft 71 passes through the first chamber 3 and extends to the outside of the first chamber 3. The first connecting shaft 72 passes through the second chamber 4 and the third chamber 5. The first external shaft 71, the first connecting shaft 72 and the first output shaft 25 are coaxial and connected sequentially by splines. The input gear 8 is fixed on the first external shaft 71, and the first gear 15 is fixed on the first connecting shaft 72.

[0042] Furthermore, in this embodiment, the second output shaft 24 includes a second external shaft 241 and a second connecting shaft 242. The second external shaft 241 passes through the third chamber 5 and extends to the outside of the third chamber 5. The second connecting shaft 242 passes through the second chamber 4. The fourth gear 21 and the fifth gear 22 are both rotatably mounted on the second connecting shaft 242. The direct drive clutch assembly 14 is mounted on the second connecting shaft 242. The second external shaft 241 and the second connecting shaft 242 are coaxial and splined together.

[0043] Furthermore, in this embodiment, the input shaft 7 and the first output shaft 25 are coaxial, and the input shaft 7, the pump drive shaft 17, the sun gear shaft 13, and the second output shaft 24 are parallel.

[0044] Furthermore, the second chamber 4 is located between the first chamber 3 and the third chamber 5. The side wall of the first chamber 3 away from the second chamber 4 is detachable, facilitating opening and closing for replacement of components within the first chamber 3. The side wall of the third chamber 5 away from the second chamber 4 is also detachable, facilitating opening and closing for replacement of components within the third chamber 5. All shaft components are mounted on the mounting box via bearings.

[0045] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A hydraulic continuously variable transmission, characterized in that: The system includes a mounting box, which is equipped with an input shaft (7), a first output shaft (25), a second output shaft (24), a pump motor (18), a pump drive shaft (17), a sun gear shaft (13), a first mounting bracket assembly (11), a second mounting bracket assembly (19), a low-speed clutch assembly (12), and a direct-drive clutch assembly (14). An input gear (8) and a first gear (15) are fixed on the first output shaft (25). The input interface of the pump motor (18) is connected to the pump drive shaft (17), and the output interface of the pump motor (18) is connected to the sun gear shaft (13). A second gear (16) is fixed on the pump drive shaft (17), and a third gear (6) is fixed on the sun gear shaft (13). A rotating... The device is equipped with a fourth gear (21) and a fifth gear (22). The input shaft (7) is connected to the first output shaft (25). The first mounting bracket assembly (11) is connected to the input gear (8), the second mounting bracket assembly (19), and the sun gear shaft (13) respectively. The first mounting bracket assembly (11) is connected to the second output shaft (24) through the low-speed clutch assembly (12). The second mounting bracket assembly (19) is connected to the sun gear shaft (13) and the fifth gear (22) respectively. The direct drive clutch assembly (14) is located on the second output shaft (24) and between the fourth gear (21) and the fifth gear (22). The first gear (15) meshes with the second gear (16), and the third gear (6) meshes with the fourth gear (21).

2. The hydraulic continuously variable transmission according to claim 1, characterized in that: The first mounting bracket assembly (11) includes a first drive shaft (111), a first drive gear (23), a first mounting bracket (112), and a first planetary gear (113). The first drive shaft (111) is located inside the mounting box. The first mounting bracket (112) is rotatably mounted on the first drive shaft (111). A first gear ring (114) and a third drive gear (115) are fixed on the first mounting bracket (112). A second drive gear (131) is fixed on the sun gear shaft (13). The first drive gear (23) is fixed on the first drive shaft (111) and meshes with the input gear (8). The first planetary gear (113) is located on the first drive shaft (111) and meshes with the first gear ring (114) and the second drive gear (131) respectively. The second mounting bracket assembly (19) is located on the first drive shaft (111). The third drive gear (115) is connected to the low-speed clutch assembly (12).

3. The hydraulic continuously variable transmission according to claim 2, characterized in that: The second mounting bracket assembly (19) includes a second mounting bracket (191) and a second planetary gear (192). A second gear ring (116) is provided on the first drive shaft (111). The second mounting bracket (191) is rotatably sleeved on the sun gear shaft (13). The second planetary gear (192) is provided on the second mounting bracket (191) and meshes with the second gear ring (116) and the fourth drive gear (132) respectively. A fifth drive gear (20) is fixed on the second mounting bracket (191). The fifth drive gear (20) meshes with the fourth gear (21).

4. The hydraulic continuously variable transmission according to claim 2, characterized in that: The low-speed clutch assembly (12) includes a second drive shaft (121), a low-speed gear (122), and a low-speed clutch (123). The second drive shaft (121) is located in the mounting box and is synchronously connected to the second output shaft (24). The low-speed gear (122) is rotatably mounted on the second drive shaft (121) and meshes with the third drive gear (115). The low-speed clutch (123) is located on the second drive shaft (121) and is used to engage with the first drive gear (23).

5. The hydraulic continuously variable transmission according to claim 4, characterized in that: The second drive shaft (121) is coaxial with the second output shaft (24) and is splined together.

6. The hydraulic continuously variable transmission according to claim 2, characterized in that: The first drive shaft (111) is coaxial with and rotatably connected to the sun gear shaft (13).

7. The hydraulic continuously variable transmission according to any one of claims 1 to 6, characterized in that: The mounting box includes a first box (1) and a second box (2) that are detachably connected. A first chamber (3) is formed inside the first box (1). A second chamber (4) is formed between the first box (1) and the second box (2). A third chamber (5) is formed inside the second box (2). The input shaft (7) passes through the first chamber (3), the second chamber (4), and the third chamber (5). The second output shaft (24) passes through the second chamber (4) and the third chamber (5). The input gear (8), the first mounting bracket assembly (11), and the low-speed clutch assembly (12) are all located in the first chamber (3). The first gear (15), the pump drive shaft (17), the sun gear shaft (13), the second mounting bracket assembly (19), the fourth gear (21), the fifth gear (22), and the direct drive clutch assembly (14) are all located in the second chamber (4).

8. The hydraulic continuously variable transmission according to claim 7, characterized in that: The input shaft (7) includes a first external shaft (71) and a first connecting shaft (72). The first external shaft (71) passes through the first chamber (3) and extends to the outside of the first chamber (3). The first connecting shaft (72) passes through the second chamber (4) and the third chamber (5). The first external shaft (71), the first connecting shaft (72) and the first output shaft (25) are coaxial and connected by splines in sequence. The input gear (8) is fixed on the first external shaft (71), and the first gear (15) is fixed on the first connecting shaft (72).

9. The hydraulic continuously variable transmission according to claim 7, characterized in that: The second output shaft (24) includes a second external shaft (241) and a second connecting shaft (242). The second external shaft (241) passes through the third chamber (5) and extends to the outside of the third chamber (5). The second connecting shaft (242) passes through the second chamber (4). The fourth gear (21) and the fifth gear (22) are both rotatably mounted on the second connecting shaft (242). The direct drive clutch assembly (14) is mounted on the second connecting shaft (242). The second external shaft (241) and the second connecting shaft (242) are coaxial and splined together.

10. The hydraulic continuously variable transmission according to claim 7, characterized in that: The input shaft (7) and the first output shaft (25) are coaxial, and the input shaft (7), the pump drive shaft (17), the sun gear shaft (13), and the second output shaft (24) are parallel.

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