Double-speed switching speed reducer

Abstract

The utility model relates to the technical field of speed reducers, in particular to a double-speed switching speed reducer which comprises a shell, an input shaft, an output shaft, a secondary planetary speed reducing mechanism and a clutch mechanism, the secondary planetary speed reducing mechanism is arranged on the shell, and the input shaft is in driving connection with the input end of the secondary planetary speed reducing mechanism; the output shaft is in driving connection with the output end of the second-stage planetary speed reduction mechanism, the clutch mechanism is in driving connection with the second-stage planetary speed reduction mechanism, the clutch mechanism has a high-speed state and a low-speed state, and when the clutch mechanism is in the high-speed state, the second-stage planetary speed reduction mechanism can conduct first-stage speed reduction transmission; when the clutch mechanism is in a low-speed state, power of the input shaft is transmitted to the output shaft after first-stage speed reduction transmission, when the clutch mechanism is in a low-speed state, the second-stage planetary speed reduction mechanism can conduct second-stage speed reduction transmission, and power of the input shaft is transmitted to the output shaft after second-stage speed reduction transmission. The rotary drilling rig power head has the effect of throwing away soil adhered to the rotary drilling rig power head through high-speed rotation.

Description

Technical Field

[0001] This application relates to the technical field of speed reducers, and in particular to a dual-speed switching speed reducer. Background Technology

[0002] Rotary drilling rigs, as a common type of engineering machinery, are widely used in various construction projects, playing a vital role, especially in infrastructure construction and bridge construction. With the continuous advancement of rotary drilling rig technology, their working efficiency and stability have been significantly improved, thereby greatly enhancing construction speed and project quality. However, the performance of rotary drilling rigs varies considerably under different geological conditions, particularly in soft soil areas, where they often face several technical challenges.

[0003] In the design of rotary drilling rig power heads, a fixed-ratio reducer is typically used to adapt to different working conditions. This type of reducer exhibits good performance when excavating hard rock, providing sufficient torque and stable speed. However, when working in soft soil areas, due to the loose soil, a large amount of soil easily adheres to the inner wall of the grab bucket during excavation, making it difficult to completely remove the soil. A common solution to this problem is to manually wash the soil inside the power head with water, but this is not only time-consuming and labor-intensive but also severely impacts construction efficiency and increases project costs.

[0004] Although various methods exist to address this issue, such as improving grab bucket design and optimizing excavation processes, these methods often fall short of completely solving the problem in practical applications. Particularly for construction in soft soil areas, existing fixed-ratio reducers cannot flexibly adjust their operating modes, resulting in insufficient efficiency under different working conditions. Therefore, effectively reducing soil adhesion and improving construction efficiency in soft soil areas has become an urgent technical problem to be solved. Utility Model Content

[0005] In order to remove the soil adhering to the power head of a rotary drilling rig by high-speed rotation, this application provides a dual-speed switching reducer.

[0006] The dual-speed switching reducer provided in this application adopts the following technical solution:

[0007] A dual-speed switching reducer includes a housing, an input shaft, an output shaft, a two-stage planetary reduction mechanism, and a clutch mechanism. The two-stage planetary reduction mechanism is disposed in the housing. The input shaft is driven to the input end of the two-stage planetary reduction mechanism, and the output shaft is driven to the output end of the two-stage planetary reduction mechanism. The clutch mechanism is driven to the two-stage planetary reduction mechanism. The clutch mechanism has a high-speed state and a low-speed state. When the clutch mechanism is in the high-speed state, the two-stage planetary reduction mechanism can perform a first-stage reduction transmission, and the power of the input shaft is transmitted to the output shaft after the first-stage reduction transmission. When the clutch mechanism is in the low-speed state, the two-stage planetary reduction mechanism can perform a second-stage reduction transmission, and the power of the input shaft is transmitted to the output shaft after the second-stage reduction transmission.

[0008] By adopting the above technical solution, the two-stage planetary reduction mechanism and the clutch mechanism work together to enable the reducer to switch between different working scenarios, achieving low-speed, high-torque and high-speed, low-torque operating modes. When the clutch mechanism is in a low-speed state, the reducer enters a low-speed, high-torque operating mode, suitable for excavating hard rock geology. When the clutch mechanism is in a high-speed state, the reducer enters a high-speed, low-torque operating mode, which helps the drilling rig grab bucket quickly shed adhering soil after excavation, improving work efficiency and reducing the time and cost of manual cleaning.

[0009] Optionally, the two-stage planetary reduction mechanism includes an input stage ring gear, an input stage sun gear, multiple input stage planet gears, an input stage planet carrier, an output stage ring gear, an output stage sun gear, multiple output stage planet gears, and an output stage planet carrier. The input stage ring gear is rotatably connected to the housing around its own axis. The output stage ring gear is relatively fixed to the housing. The input stage sun gear and the output stage sun gear are coaxially arranged. The input stage planet carrier and the output stage planet carrier have carrier legs and carrier rings. The input stage sun gear serves as the input end of the two-stage planetary reduction mechanism. The input-stage planetary gears are rotatably connected to the carrier legs of the input-stage planetary carrier via bearings, and the input-stage planetary gears mesh with the input-stage ring gear and the input-stage sun gear respectively. The input-stage planetary carrier rotates synchronously with the output-stage sun gear. The carrier ring of the output-stage planetary carrier serves as the output end of the second-stage planetary reduction mechanism. The output-stage planetary gears are rotatably connected to the carrier legs of the output-stage planetary carrier via bearings, and the output-stage planetary gears mesh with the output-stage ring gear and the output-stage sun gear respectively.

[0010] By employing the above technical solution, with the input stage ring gear locked in place, power is input to the input stage sun gear, i.e., the input end of the two-stage planetary reduction mechanism. Since the ring gear is locked, the input stage planetary gears, during meshing with the input stage sun gear and the input stage ring gear, can rotate on their own axes and simultaneously revolve around the input stage sun gear. The revolution of the input stage planetary gears drives the rotation of the input stage planet carrier, causing the output stage sun gear to rotate. Therefore, the rotation of the input stage sun gear reduces speed and transmits this speed to the output stage sun gear, causing it to rotate. Simultaneously, the output stage planetary gears are connected to the carrier legs of the output stage planet carrier via bearings, allowing them to rotate on their own axes while revolving around the output stage sun gear. Due to the revolution of the output stage planetary gears, the output stage planet carrier rotates along with them. Ultimately, the carrier ring of the output stage planet carrier serves as the output end of the two-stage planetary reduction mechanism, outputting rotation after two stages of speed reduction.

[0011] With the input stage ring gear and input stage sun gear locked relative to each other, the input stage sun gear cannot rotate relative to the input stage ring gear. Therefore, the power from the input shaft acts directly on the input stage planetary carrier. This power is then transmitted through the input stage planetary carrier to the output stage sun gear, causing it to rotate. Simultaneously, the output stage planetary gears are connected to the carrier legs of the output stage planetary carrier via bearings, allowing them to rotate on their own axes while simultaneously revolving around the output stage sun gear. Due to the revolution of the output stage planetary gears, the output stage planetary carrier rotates along with them. Ultimately, the carrier ring of the output stage planetary carrier serves as the output end of the second-stage planetary reduction mechanism, outputting rotation after the first-stage reduction.

[0012] Optionally, the clutch mechanism includes a first clutch assembly and a second clutch assembly. The first clutch assembly is simultaneously driven and connected to both the housing and the input stage gear ring. When the first clutch assembly is closed, the housing and the input stage gear ring are locked relative to each other. The second clutch assembly is simultaneously driven and connected to both the input stage gear ring and the input stage sun gear. When the second clutch assembly is closed, the input stage gear ring and the input stage sun gear are locked relative to each other.

[0013] By adopting the above technical solution, the combination of the first clutch assembly and the second clutch assembly enables the reducer to switch between different working states.

[0014] Optionally, when the clutch mechanism is in the high-speed state, the first clutch component is open and the second clutch component is closed; when the clutch mechanism is in the low-speed state, the first clutch component is closed and the second clutch component is open.

[0015] By adopting the above technical solution, when the first clutch assembly is closed and the second clutch assembly is open, the housing and the gear ring are locked relative to each other, realizing a low-speed, high-torque working mode; when the first clutch assembly is open and the second clutch assembly is closed, the input stage gear ring and the input stage sun gear are locked relative to each other, realizing a high-speed, low-torque working mode.

[0016] Optionally, the clutch mechanism further includes a trigger component, which is used to switch the clutch mechanism from the high-speed state to the low-speed state, or to switch the clutch mechanism from the low-speed state to the high-speed state.

[0017] By adopting the above technical solution, the setting of the trigger component enables the clutch mechanism to switch between high-speed and low-speed states.

[0018] Optionally, the housing includes a housing cover and an end cap disposed at one end of the housing cover; the triggering assembly includes: a cylinder head, which is integrally formed with the housing; a piston, which is reciprocating along its own axis and disposed within the housing, the piston including a first trigger ring and a second trigger ring disposed on the side of the first trigger ring away from the first clutch assembly, the first trigger ring cooperating with the cylinder head, the second trigger ring cooperating with the housing, the first trigger ring being used to abut against the first clutch assembly to close the first clutch assembly, an oil chamber being formed between the cylinder head, the housing, and the piston; and an oil nozzle, which is connected to the oil chamber. A reciprocating spring is provided parallel to the axis of the housing and located on the side of the piston away from the first clutch assembly. One end of the reciprocating spring is fixedly connected to the end cap, and the other end abuts against the second trigger ring. A third trigger ring is provided inside the housing and is capable of reciprocating along its own axis. The third trigger ring abuts against the second clutch assembly to close the second clutch assembly. A lever is provided radially along the housing and hinged to the end cap. One end of the lever abuts against the third trigger ring, and the other end of the lever abuts against the second trigger ring.

[0019] By adopting the above technical solution, during the excavation cycle, the hydraulic cylinder is in a depressurized state. The return spring force presses the second trigger ring, pushing the first trigger ring to close the first clutch assembly, and the second clutch assembly opens, allowing the reducer to operate in a low-speed, high-torque mode. After the rotary drilling rig completes the excavation and emptys the soil from the grab bucket, the grab bucket needs to rotate at high speed to remove the soil adhering to the inner wall. At this time, the hydraulic nozzle connects to pressurized oil, and the piston moves towards the end cover. The first trigger ring moves away from the first clutch assembly, opening it. The second trigger ring drives the lever to pry open the third trigger ring, closing the second clutch assembly. At this point, the input stage of the two-stage planetary reduction mechanism is not working, and the reducer operates in a high-speed, low-torque mode. This design not only improves work efficiency but also reduces the time and labor intensity of manual soil removal, thus enhancing overall operational efficiency.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. When constructing in soft soil areas, the clutch mechanism enables the reducer to switch between two speeds, allowing it to quickly switch to a high-speed, low-torque working mode after excavation, efficiently removing the soil adhering to the inner wall of the grab bucket and significantly improving construction efficiency.

[0022] 2. Through the coordinated action of the first clutch assembly and the second clutch assembly, a smooth transition between the two working modes of low speed and high torque and high speed and low torque is achieved, ensuring the stability and reliability of the rotary drilling rig under different working conditions;

[0023] 3. The ingenious design of the hydraulic cylinder and triggering components makes the switching operation of the clutch mechanism simple and quick, requiring no additional manual intervention, reducing construction costs and improving economic efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the dual-speed switching reducer provided in the embodiments of this application.

[0025] Explanation of reference numerals in the attached diagram: 1-Shell; 2-End cap; 3-Input stage gear ring; 4-Input stage sun gear; 5-Input stage planetary gears; 6-Input stage planetary carrier; 7-Output stage sun gear; 8-Output stage planetary gears; 9-Output stage planetary carrier; 10-Output stage gear ring; 11-First clutch assembly; 12-Second clutch assembly; 13-Cylinder head; 14-Piston; 1401-First trigger ring; 1402-Second trigger ring; 15-Oil nozzle; 16-Reset spring; 17-Third trigger ring; 18-Lever. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0027] This application discloses a dual-speed switching reducer.

[0028] like Figure 1 As shown, the dual-speed switching reducer includes a housing, an input shaft, an output shaft, a two-stage planetary reduction mechanism, and a clutch mechanism. The two-stage planetary reduction mechanism is located in the housing. The input shaft is driven to the input end of the two-stage planetary reduction mechanism, and the output shaft is driven to the output end of the two-stage planetary reduction mechanism. The clutch mechanism is driven to the two-stage planetary reduction mechanism and has high-speed and low-speed modes. When the clutch mechanism is in high-speed mode, the two-stage planetary reduction mechanism can perform first-stage reduction transmission, and the power from the input shaft is transmitted to the output shaft after the first-stage reduction transmission. When the clutch mechanism is in low-speed mode, the two-stage planetary reduction mechanism can perform second-stage reduction transmission, and the power from the input shaft is transmitted to the output shaft after the second-stage reduction transmission. This allows the rotary drilling rig to flexibly adjust its working mode under different working conditions, improving construction efficiency and operational flexibility.

[0029] like Figure 1 As shown, specifically, the two-stage planetary reduction mechanism includes an input stage ring gear 3, an input stage sun gear 4, multiple input stage planet gears 5, an input stage planet carrier 6, an output stage ring gear 10, an output stage sun gear 7, multiple output stage planet gears 8, and an output stage planet carrier 9. Both the input stage ring gear 3 and the output stage ring gear 10 are internal ring gears. The input stage ring gear 3 is rotatably connected to the outer casing around its own axis, the output stage ring gear 10 is fixed relative to the outer casing, the input stage sun gear 4 and the output stage sun gear 7 are coaxially arranged, the input stage planetary carrier 6 and the output stage planetary carrier 9 have carrier feet and carrier rings, the input stage sun gear 4 serves as the input end of the second-stage planetary reduction mechanism, the input stage planetary gear 5 is rotatably connected to the carrier feet of the input stage planetary carrier 6 via bearings around its own axis, and the input stage planetary gear 5 meshes with the input stage ring gear 3 and the input stage sun gear 4 respectively, the input stage planetary carrier 6 rotates synchronously with the output stage sun gear 7, the carrier ring of the output stage planetary carrier 9 serves as the output end of the second-stage planetary reduction mechanism, the output stage planetary gear 8 is rotatably connected to the carrier feet of the output stage planetary carrier 9 via bearings around its own axis, and the output stage planetary gear 8 meshes with the output stage ring gear 10 and the output stage sun gear 7 respectively.

[0030] With the input stage ring gear 3 fixed, power is transmitted to the input stage sun gear 4, which is the input end of the two-stage planetary reduction mechanism. Due to the fixed state of the ring gear, the input stage planet gear 5, during its meshing transmission with the input stage sun gear 4 and the input stage ring gear 3, can achieve both rotation and revolution around the input stage sun gear 4. The revolution of the input stage planet gear 5 drives the input stage planet carrier 6 to rotate, which in turn causes the output stage sun gear 7 to rotate. Therefore, the rotation of the input stage sun gear 4, after reduction, is transmitted to the output stage sun gear 7, enabling its rotation. Simultaneously, the output stage planet gear 8 is connected to the carrier legs of the output stage planet carrier 9 via bearings, allowing it to rotate around the output stage sun gear 7 while simultaneously rotating on its own axis. The revolution of the output stage planet gear 8 drives the output stage planet carrier 9 to rotate. Finally, the carrier ring of the output stage planet carrier 9 serves as the output end of the two-stage planetary reduction mechanism, outputting the rotation after two-stage reduction.

[0031] With the input stage ring gear 3 locked relative to the input stage sun gear 4, the input stage sun gear 4 cannot rotate relative to the input stage ring gear 3. Therefore, the power from the input shaft acts directly on the input stage planetary carrier 6. At this time, the power is transmitted to the output stage sun gear 7 through the input stage planetary carrier 6, causing it to rotate. Simultaneously, the output stage planetary gear 8 is connected to the carrier legs of the output stage planetary carrier 9 via bearings, allowing it to revolve around the output stage sun gear 7 while rotating on its own axis. The revolve motion of the output stage planetary gear 8 drives the output stage planetary carrier 9 to rotate. Ultimately, the carrier ring of the output stage planetary carrier 9 serves as the output end of the second-stage planetary reduction mechanism, outputting rotation after the first-stage reduction.

[0032] The clutch mechanism includes a first clutch assembly 11 and a second clutch assembly 12. The first clutch assembly 11 is drivenly connected to both the housing and the input stage gear ring 3. When the first clutch assembly 11 is closed, the housing and the input stage gear ring 3 are locked relative to each other. The second clutch assembly 12 is drivenly connected to both the input stage gear ring 3 and the input stage sun gear 4. When the second clutch assembly 12 is closed, the input stage gear ring 3 and the input stage sun gear 4 are locked relative to each other. When the clutch mechanism is in a high-speed state, the first clutch assembly 11 is open and the second clutch assembly 12 is closed; when the clutch mechanism is in a low-speed state, the first clutch assembly 11 is closed and the second clutch assembly 12 is open. In this embodiment, the clutch assembly can be a friction disc clutch or a ratchet clutch; this application does not impose any limitation on this.

[0033] In addition, the clutch mechanism also includes a triggering component, which is used to switch the clutch mechanism from a high-speed state to a low-speed state, or from a low-speed state to a high-speed state.

[0034] like Figure 1As shown, specifically, the outer casing includes a housing 1 and an end cap 2 located at one end of the housing 1. The trigger assembly includes a cylinder head 13, a piston 14, an oil nozzle 15, a return spring 16, a third trigger ring 17, and a lever 18. The cylinder head 13 is integrally formed with the outer casing. The piston 14 is reciprocating within the outer casing along its own axis. The piston 14 includes a first trigger ring 1401 and a second trigger ring 1402 located on the side of the first trigger ring 1401 away from the first clutch assembly 11. The first trigger ring 1401 cooperates with the cylinder head 13, and the second trigger ring 1402 cooperates with the outer casing. The first trigger ring 1401 is used to abut against the first clutch assembly 11 to close the first clutch assembly 11. An oil chamber is formed between the cylinder head 13, the outer casing, and the piston 14. The grease nipple 15 is connected to the oil chamber. The return spring 16 is located parallel to the axis of the housing on the side of the piston 14 away from the first clutch assembly 11. One end of the return spring 16 is fixedly connected to the end cover 2, and the other end abuts against the second trigger ring 1402. The third trigger ring 17 is reciprocatingly located inside the housing along its own axis. The third trigger ring 17 abuts against the second clutch assembly 12 to close the second clutch assembly 12. The lever 18 is arranged radially along the housing 1 and hinged to the end cover 2. One end of the lever 18 abuts against the third trigger ring 17, and the other end of the lever 18 abuts against the second trigger ring 1402.

[0035] In practical implementation, when the rotary drilling rig is excavating hard rock, the clutch mechanism is in a low-speed state, the hydraulic cylinder is in a depressurized state, and the second trigger ring 1402 is pressed by the return spring 16, which pushes the first trigger ring 1401 to close the first clutch assembly 11 and open the second clutch assembly 12. The two-stage planetary reduction mechanism performs two-stage reduction transmission, and the power of the input shaft is transmitted to the output shaft after the two-stage reduction transmission, providing a high-torque, low-speed working mode. When the rotary drilling rig is working in soft soil, the clutch mechanism can quickly switch to a high-speed state. The oil nozzle 15 connects to the pressurized oil, the piston 14 moves towards the end cover 2, the first trigger ring 1401 moves away from the first clutch assembly 11, which opens the first clutch assembly 11, and the second trigger ring 1402 drives the lever 18 to pry open the third trigger ring 17, which closes the second clutch assembly 12. The input stage of the two-stage planetary reduction mechanism does not work, and the power of the input shaft is transmitted to the output shaft after the first-stage reduction transmission, providing a high-speed, low-torque working mode. This allows the grab bucket to rotate at high speed after the excavation work is completed, so as to shake off the soil adhering to the inner wall of the grab bucket and improve construction efficiency.

[0036] The implementation principle of this embodiment is as follows: by setting a dual-speed switching reducer, the rotary drilling rig can flexibly adjust its working mode under different working conditions, thereby improving construction efficiency and operational flexibility. Specifically, when the rotary drilling rig is excavating hard rock, the clutch mechanism is in a low-speed state, providing a high-torque, low-speed working mode; when the rotary drilling rig is working in soft soil, the clutch mechanism can quickly switch to a high-speed state, providing a high-speed, low-torque working mode, thus effectively solving the problem of soil adhesion to the inner wall of the grab bucket and improving construction efficiency.

[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dual-speed switching reducer, characterized in that, include: The system comprises a housing, an input shaft, an output shaft, a two-stage planetary reducer, and a clutch mechanism. The two-stage planetary reducer is located within the housing. The input shaft is driven to the input end of the two-stage planetary reducer, and the output shaft is driven to the output end of the two-stage planetary reducer. The clutch mechanism is driven to the two-stage planetary reducer. The clutch mechanism has a high-speed state and a low-speed state. When the clutch mechanism is in the high-speed state, the two-stage planetary reducer can perform a first-stage reduction transmission, and the power from the input shaft is transmitted to the output shaft after the first-stage reduction transmission. When the clutch mechanism is in the low-speed state, the two-stage planetary reducer can perform a second-stage reduction transmission, and the power from the input shaft is transmitted to the output shaft after the second-stage reduction transmission.

2. The dual-speed switching reducer according to claim 1, characterized in that, The two-stage planetary reduction mechanism includes an input stage ring gear (3), an input stage sun gear (4), multiple input stage planetary gears (5), an input stage planet carrier (6), an output stage ring gear (10), an output stage sun gear (7), multiple output stage planetary gears (8), and an output stage planet carrier (9). The input stage ring gear (3) is rotatably connected to the outer casing around its own axis. The output stage ring gear (10) is fixed relative to the outer casing. The input stage sun gear (4) and the output stage sun gear (7) are coaxially arranged. The input stage planet carrier (6) and the output stage planet carrier (9) have carrier legs and carrier rings. The input stage sun gear (4) serves as the input end of the two-stage planetary reduction mechanism. The input stage planetary gear (5) is rotatably connected to the base of the input stage planetary carrier (6) via a bearing around its own axis, and the input stage planetary gear (5) meshes with the input stage ring gear (3) and the input stage sun gear (4) respectively. The input stage planetary carrier (6) rotates synchronously with the output stage sun gear (7). The ring of the output stage planetary carrier (9) serves as the output end of the second-stage planetary reduction mechanism. The output stage planetary gear (8) is rotatably connected to the base of the output stage planetary carrier (9) via a bearing around its own axis, and the output stage planetary gear (8) meshes with the output stage ring gear (10) and the output stage sun gear (7) respectively.

3. The dual-speed switching reducer according to claim 2, characterized in that, The clutch mechanism includes a first clutch assembly (11) and a second clutch assembly (12). The first clutch assembly (11) is simultaneously driven connected to the housing and the input stage gear ring (3). When the first clutch assembly (11) is closed, the housing and the input stage gear ring (3) are locked relative to each other. The second clutch assembly (12) is simultaneously driven connected to the input stage gear ring (3) and the input stage sun gear (4). When the second clutch assembly (12) is closed, the input stage gear ring (3) and the input stage sun gear (4) are locked relative to each other.

4. The dual-speed switching reducer according to claim 3, characterized in that, When the clutch mechanism is in the high-speed state, the first clutch assembly (11) is open and the second clutch assembly (12) is closed. When the clutch mechanism is in the low-speed state, the first clutch assembly (11) is closed and the second clutch assembly (12) is open.

5. The dual-speed switching reducer according to claim 4, characterized in that, The clutch mechanism further includes a triggering component, which is used to switch the clutch mechanism from the high-speed state to the low-speed state, or switch the clutch mechanism from the low-speed state to the high-speed state.

6. The dual-speed switching reducer according to claim 5, characterized in that, The outer shell includes a shell cover (1) and an end cap (2) disposed at one end of the shell cover (1); The triggering component includes: Cylinder head (13), wherein the cylinder head (13) is integrally formed with the outer shell; A piston (14) is disposed within the housing and is capable of reciprocating along its own axis. The piston (14) includes a first trigger ring (1401) and a second trigger ring (1402) disposed on the side of the first trigger ring (1401) away from the first clutch assembly (11). The first trigger ring (1401) cooperates with the cylinder head (13), and the second trigger ring (1402) cooperates with the housing. The first trigger ring (1401) is used to abut against the first clutch assembly (11) to close the first clutch assembly (11). An oil chamber is formed between the cylinder head (13), the housing, and the piston (14). Oil nozzle (15) is connected to the oil cavity; A return spring (16) is provided parallel to the axis of the outer shell on the side of the piston (14) away from the first clutch assembly (11). One end of the return spring (16) is fixedly connected to the end cap (2), and the other end abuts against the second trigger ring (1402). The third trigger ring (17) is disposed inside the housing and is capable of reciprocating along its own axis. The third trigger ring (17) is used to abut against the second clutch assembly (12) to close the second clutch assembly (12). A lever (18) is arranged radially along the housing (1) and hinged to the end cap (2). One end of the lever (18) is used to abut against the third trigger ring (17), and the other end of the lever (18) is used to abut against the second trigger ring (1402).

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