High-reliability hydraulic retarder

Abstract

The application relates to a high-reliability hydraulic speed reducer and relates to the technical field of automobile parts. The speed reducer body comprises a stator and a rotor, a working cavity is formed between the stator and the rotor, a cooling cover is arranged on the outer wall of the speed reducer body, the cooling cover is arranged along the circumferential direction of the stator and the rotor, input ports and output ports for the working liquid to enter and exit the working cavity are formed in the cooling cover, a plurality of heat exchange fins are arranged on the cooling cover, one end of the heat exchange fins penetrates through the cooling cover and is inserted into the working cavity, a refrigerant tank is arranged on the outer wall of the cooling cover, and the end of the heat exchange fin extending out of the cooling cover is inserted into the refrigerant tank; an ejection mechanism for changing the volume of the working cavity is arranged on the end wall of the stator facing the rotor. The application has the effects of improving the cooling effect of the hydraulic speed reducer on the working liquid, maintaining the braking performance of the hydraulic speed reducer and improving the reliability of the hydraulic speed reducer.

Description

Technical Field

[0001] This application relates to the field of automotive parts technology, and in particular to a high-reliability hydraulic reducer. Background Technology

[0002] A hydraulic speed reducer, also known as a hydraulic retarder, is an automotive component that uses a hydraulic device to reduce the speed of a vehicle.

[0003] In related technologies, a hydraulic reducer is designed, including a rotor, a stator, a working chamber, and an oil reservoir. The stator is the housing of the hydraulic reducer and is connected to the rear end of the transmission or the vehicle frame. The rotor is connected to the drive shaft through a hollow shaft. The working chamber is located between the rotor and the stator, and the oil reservoir is connected to the working chamber. When the hydraulic reducer is working, the working fluid in the oil reservoir fills the working chamber between the rotor and the stator. When the rotor rotates, the working fluid exerts torque on the stator. The counter-torque of the stator becomes the braking torque of the rotor. The buffering effect is generated by the liquid damping, thereby realizing the braking of the vehicle.

[0004] Regarding the aforementioned technologies, the following problems exist: When a car is driven continuously for a long time, the temperature of the working fluid in the hydraulic reducer's working chamber gradually increases. Because existing hydraulic reducers have poor cooling effects on the working fluid, when the working fluid temperature is too high, the car's control system will forcibly drive the hydraulic reducer to automatically reduce torque to prevent the working fluid temperature from rising further and causing safety hazards. At this time, the hydraulic reducer will gradually exit the working state, and the braking torque will gradually weaken linearly, resulting in low reliability of the hydraulic reducer and difficulty in timely and accurate braking effect, posing safety hazards. Therefore, improvements are needed. Summary of the Invention

[0005] In order to improve the cooling effect of the hydraulic reducer on the working fluid, maintain the braking performance of the hydraulic reducer, and improve the reliability of the hydraulic reducer, this application provides a high-reliability hydraulic reducer.

[0006] The high-reliability hydraulic reducer provided in this application adopts the following technical solution: A high-reliability hydraulic reducer includes a reducer body, which includes a stator and a rotor, forming a working chamber between the stator and rotor. A cooling shroud is provided on the outer wall of the reducer body, and the cooling shroud is arranged along the circumferential direction of the stator and rotor. The cooling shroud has an inlet and an outlet for the working fluid to enter and exit the working chamber. A plurality of heat exchange fins are provided on the cooling shroud, with one end of each heat exchange fin passing through the cooling shroud and inserted into the working chamber. A refrigerant tank is provided on the outer wall of the cooling shroud, and the ends of the heat exchange fins extending out of the cooling shroud are inserted into the refrigerant tank. A plurality of ejection mechanisms for changing the volume of the working chamber are provided on the end wall of the stator facing the rotor.

[0007] By adopting the above technical solution, the low-temperature refrigerant in the refrigerant tank exchanges heat with the heat exchange plates, enabling the heat exchange plates to maintain a low temperature. The temperature is then transferred to one end of the heat exchange plates located in the working chamber. The working fluid in the working chamber comes into contact with the heat exchange plates, thereby exchanging the low temperature of the heat exchange plates with the working fluid, thus cooling the working fluid. When the temperature is too high, the ejection mechanism is activated, expanding the volume of the working chamber, allowing more working fluid to enter the working chamber. The working fluid that just enters the working chamber is at a lower temperature and can exchange heat with the original working fluid, thereby reducing the overall temperature, maintaining the braking performance of the hydraulic reducer, and improving the safety and reliability of the hydraulic reducer.

[0008] Optionally, the heat exchange fin sidewall is provided with a snap-fit ​​block, the outer wall of the cooling cover is provided with a first clearance groove for the lower end of the snap-fit ​​block to be embedded, the bottom wall of the refrigerant tank is in contact with the outer wall of the cooling cover, the bottom wall of the refrigerant tank is provided with a second clearance groove for the upper end of the snap-fit ​​block to be embedded, and the refrigerant tank is provided with fasteners for fixing the refrigerant tank and the cooling cover.

[0009] By adopting the above technical solution, the refrigerant box is detachably connected to the cooling cover by fasteners, which facilitates the quick disassembly and replacement of the refrigerant box. The first and second clearance grooves are respectively opened for the mounting of the retaining block, so that the heat exchanger plates that are damaged or corroded can be easily replaced, ensuring that the heat exchanger plates in the hydraulic reducer of this application can maintain normal operation, thus improving convenience and practicality.

[0010] Optionally, the inner wall of the cooling cover is provided with a plurality of elastic sealing rings, each of which corresponds to a heat exchange plate. The inner wall of the elastic sealing ring is constricted toward the center. One end of the heat exchange plate inserted into the working chamber passes through the corresponding elastic sealing ring, and the inner wall of the elastic sealing ring abuts against the outer wall of the heat exchange plate.

[0011] By adopting the above technical solution and setting an elastic sealing ring, the elastic sealing ring can be kept in close contact with the heat exchange fins, thereby improving the airtightness of the cooling cover, preventing the leakage of working fluid, and improving the overall sealing performance and safety.

[0012] Optionally, the end wall of the heat exchange plate inserted into the working chamber has a pointed end.

[0013] By adopting the above technical solution, an opening with a pointed tip is made at the bottom of the heat exchange plate to facilitate the opening of the elastic sealing ring, which makes the installation of the heat exchange plate easier and more convenient.

[0014] Optionally, a liquid pump is provided on the outer wall of the refrigerant tank. The input end of the liquid pump is connected to the refrigerant tank, and the output end of the liquid pump is connected to a spiral cooling pipe. The other end of the spiral cooling pipe is connected to the refrigerant tank.

[0015] By adopting the above technical solution, the liquid pump and spiral cooling pipe can discharge and cool the refrigerant that has been heated by heat exchange in the refrigerant tank. After cooling is completed, the refrigerant can re-enter the refrigerant tank for heat exchange, thereby improving the sustainability of the working fluid cooling in this application and further improving the cooling efficiency.

[0016] Optionally, the ejection mechanism includes two sliding rods, a reset component, two sets of driving components, a mounting plate, and a universal ball joint. The sliding rods and driving components correspond one-to-one. The stator end wall has a sliding groove. One end of each of the two sliding rods is slidably connected in the sliding groove. The reset component is disposed in the sliding groove and abuts between the two sliding rods. The reset component causes the two sliding rods to slide in opposite directions. The driving component is disposed on the side of the corresponding sliding rod away from the other sliding rod. The driving component is used to drive the two sliding rods to slide in a direction closer to each other. The ends of the two sliding rods extending out of the sliding groove approach each other. The mounting plate is located at the end of the sliding rod near the rotor. An intermediate plate is disposed at the end of the mounting plate facing the sliding rod. The intermediate plate is located between the two sliding rods. The sliding rod is hinged to the intermediate plate. The universal ball joint is disposed at the end of the mounting plate facing the rotor. The rotor end wall has an annular groove along the circumferential direction for the universal ball joint to be embedded and slide.

[0017] By adopting the above technical solution, when the working fluid temperature is too high, the drive unit starts, driving the respective sliding rods to move towards each other. Since the sliding rods and the mounting plates are hinged through the intermediate plate, they can push the mounting plates towards the rotor. Through the universal ball joint, the rotor is pressed against the rotor, causing the rotor to move away from the stator, thereby increasing the volume of the working chamber. This allows more working fluid to enter the working chamber and mix with the original working fluid for cooling. When the temperature drops, the drive unit starts again. Under the action of the reset unit, the two sliding rods move away from each other, causing the mounting plates to gradually move away from the rotor. The rotor, which has lost the pressure of the universal ball joint, will also gradually reset, restoring the volume of the working chamber. The ejection mechanism of this application has a simple structure, is easy to implement, and has high convenience.

[0018] Optionally, the driving component includes a piston tube and a piston rod. The piston tube is connected to the inner wall of the sliding groove, and the piston rod is slidably connected inside the piston tube. One end of the piston rod extending out of the piston tube is hinged to a corresponding sliding rod, and the piston tube is filled with inert gas.

[0019] By adopting the above technical solution, inert gas is filled into the piston tube. When the temperature of the working fluid in the working chamber rises, it will exchange heat with the inert gas in the piston column. The inert gas expands when heated, pushing the piston column outward, thereby driving the sliding rod to move. The driving component of this application can be realized without the use of a power element, with a simple and convenient structure. Moreover, the inert gas has stable chemical properties. As the temperature of the working fluid continues to rise, the volume of the working chamber can be continuously increased, while improving the safety of the driving component during operation.

[0020] Optionally, the piston tube is made of silicon carbide.

[0021] By adopting the above technical solution, silicon carbide tubes have stable chemical properties, high thermal conductivity, and low coefficient of thermal expansion, which can better conduct heat to the inert gas inside, making the thermal expansion of the inert gas more sensitive, and thus having high stability and practicality.

[0022] Optionally, the rotor has a buffer cavity on the end wall facing the stator, a buffer block is provided in the buffer cavity, and an elastic element is provided between the buffer block and the bottom wall of the buffer cavity. The elastic element keeps the buffer block moving in the direction of extending out of the buffer cavity, and the annular groove is formed on the surface of the buffer block.

[0023] By adopting the above technical solution and setting a buffer block, the buffer block slides in the buffer cavity, thereby replacing the rotor in sliding. This can reduce the wear between the rotor and each transmission shaft, maintain the proper connection, and extend the service life.

[0024] Optionally, the bottom wall of the buffer block is provided with an elastic sealing sleeve, which is coaxially arranged with the buffer block and abuts against the bottom wall of the buffer cavity.

[0025] By adopting the above technical solution, the elastic sealing sleeve can block the working fluid from entering through the gap between the self-buffer block and the buffer chamber, so as to prevent liquid accumulation in the buffer chamber and improve safety.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The low-temperature refrigerant in the refrigerant box exchanges heat with the heat exchange plate, enabling the heat exchange plate to maintain a low temperature. The temperature is then transferred to one end of the heat exchange plate located in the working chamber. The working fluid in the working chamber comes into contact with the heat exchange plate, thereby exchanging the low temperature of the heat exchange plate with the working fluid, thus achieving the cooling of the working fluid. 2. When the temperature is too high, the ejection mechanism is activated to expand the volume of the working chamber, allowing more working fluid to enter the working chamber. The working fluid that just enters the working chamber is at a lower temperature and can exchange heat with the original working fluid, thereby reducing the overall temperature, maintaining the braking performance of the hydraulic reducer, and improving the safety and reliability of the hydraulic reducer. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a high-reliability hydraulic reducer in an embodiment of this application.

[0028] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0029] Figure 3 yes Figure 2 A magnified view of a section at point B in the middle.

[0030] Explanation of reference numerals in the attached drawings: 1. Reducer body; 2. Stator; 21. Sliding groove; 3. Rotor; 31. Buffer chamber; 32. Buffer block; 321. Annular groove; 33. Elastic element; 34. Elastic sealing sleeve; 4. Working chamber; 5. Cooling cover; 51. Inlet; 52. Outlet; 53. First clearance groove; 54. Elastic sealing ring; 6. Heat exchange plate; 61. Snap-fit ​​block; 62. Tip; 7. Refrigerant tank; 71. Second clearance groove; 72. Fastener; 73. Liquid pump; 74. Spiral cooling pipe; 8. Ejection mechanism; 81. Sliding rod; 82. Reset element; 83. Drive element; 831. Piston tube; 832. Piston column; 84. Mounting plate; 841. Intermediate plate; 85. Universal ball joint. Implementation

[0031] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0032] This application discloses a high-reliability hydraulic reducer. (Refer to...) Figure 1 The reducer body 1 includes a stator 2 and a rotor 3. The stator 2 is connected to the rear end of the vehicle frame or transmission. The stator 2 is connected to the drive shaft through a hollow shaft. The rotor 3 is rotatably arranged relative to the stator 2. A working chamber 4 for filling with working fluid is formed between the stator 2 and the rotor 3.

[0033] Reference Figure 1 and Figure 2A cooling shroud 5 is provided on the outer wall of the reducer body 1. The cooling shroud 5 is welded to the outer wall of the stator 2. The cooling shroud 5 is arranged along the circumferential direction of the stator 2 and the rotor 3 to cover the working chamber 4. The cooling shroud 5 has an inlet 51 and an outlet 52 for the working fluid to enter and exit the working chamber 4. Several heat exchange fins 6 are provided on the cooling shroud 5. The heat exchange fins 6 are arranged linearly. Each heat exchange fin 6 has an integrally formed snap-fit ​​block 61 on its peripheral wall. Several first clearance grooves 53 are provided on the surface of the cooling shroud 5 for the lower end of the snap-fit ​​block 61 to be embedded. The heat exchange fin 6 is embedded into the first clearance groove 53 through the snap-fit ​​block 61, and one end of the snap-fit ​​block 6 passes through the first clearance groove 53. The bottom wall of the clearance groove 53 enters the working chamber 4; a refrigerant tank 7 is provided on the outer wall of the cooling cover 5, and a fastener 72 is provided on the side wall of the refrigerant tank 7 to fix the refrigerant tank 7 to the cooling cover 5. In this embodiment, the fastener 72 is a bolt. The bottom wall of the refrigerant tank 7 is provided with a second clearance groove 71 for the upper end of the locking block 61 to be embedded. The other end of the heat exchange plate 6 passes through the second clearance groove 71 and is inserted into the refrigerant tank 7. The refrigerant tank 7 is filled with low-temperature refrigerant to cool the heat exchange plate 6. Then, the working fluid is cooled by the end of the heat exchange plate 6 inserted into the working chamber 4 to ensure the normal operation of the hydraulic reducer and improve reliability.

[0034] Reference Figure 1 and Figure 2 A liquid pump 73 is installed on the outer wall of the refrigerant tank 7. The input end of the liquid pump 73 is connected to the refrigerant tank 7, and the output end of the liquid pump 73 is connected to a spiral cooling pipe 74. The other end of the spiral cooling pipe 74 is connected to the refrigerant tank 7. By setting the spiral cooling pipe 74 and the liquid pump 73, the refrigerant in the refrigerant tank 7 is replaced after the temperature rises. Low-temperature refrigerant is introduced, and the refrigerant extracted is cooled by flowing through the length of the spiral cooling pipe 74. This improves the continuous cooling effect of the working fluid in this application to meet the needs of long-term operation of automobiles.

[0035] Reference Figure 1 and Figure 2 The inner wall of the cooling cover 5 is provided with several elastic sealing rings 54 by adhesive. In this embodiment, the elastic sealing rings 54 are made of rubber. The elastic sealing rings 54 correspond one-to-one with the heat exchange plates 6. The inner wall of the elastic sealing rings 54 is constricted towards the center. The end wall of the heat exchange plate 6 inserted into the working cavity 4 has a pointed part 62. The pointed part 62 of the heat exchange plate 6 passes through the corresponding elastic sealing ring 54. The inner wall of the elastic sealing ring 54 abuts against the outer wall of the heat exchange plate 6 to improve the sealing performance of the cooling cover 5.

[0036] Reference Figure 1 and Figure 3The stator 2 is provided with several ejection mechanisms 8 on the end wall facing the rotor 3 to change the volume of the working chamber 4, so as to replenish the low-temperature working fluid when the temperature rises continuously, mix it with the high-temperature coolant, and reduce the overall temperature. The ejection mechanism 8 includes two sliding rods 81, a reset member 82, two sets of driving members 83, a mounting plate 84 and a universal ball joint 85, wherein the sliding rods 81 and the driving members 83 are arranged one-to-one.

[0037] Reference Figure 1 and Figure 3 The stator 2 end wall is provided with several sliding grooves 21, each sliding groove 21 corresponds to an ejection mechanism 8. One end of each of the two sliding rods 81 is slidably connected in the corresponding sliding groove 21. In the initial state, the ends of the two sliding rods 81 inserted into the sliding groove 21 are far apart from each other. The reset member 82 is set in the sliding groove 21. In this embodiment, the reset member 82 is a spring, which is glued between the two sliding rods 81. Under the action of the reset member 82, the two sliding rods 81 maintain the tendency to slide in the opposite direction.

[0038] Reference Figure 1 and Figure 3 The driving component 83 is disposed on the side of the corresponding sliding rod 81 opposite to the other sliding rod 81. The driving component 83 is used to drive the two sliding rods 81 to slide in a direction closer to each other. The driving component 83 includes a piston tube 831 and a piston column 832. The piston tube 831 is glued to the inner wall of the sliding groove 21. In this embodiment, the piston tube 831 is a silicon carbide tube with stable chemical properties, high thermal conductivity, and low coefficient of thermal expansion, so as to more sensitively transmit the temperature of the external working fluid. The piston column 832 is slidably connected to the sliding groove 21. Inside the piston tube 831, one end of the piston rod 832 extending out of the piston tube 831 is hinged to the corresponding sliding rod 81. The piston tube 831 is filled with inert gas. When the inert gas is heated, it expands and pushes the piston rod 832 to slide, thereby pushing the sliding rod 81. Conversely, when the temperature decreases, the inert gas contracts. Under the action of external hydraulic pressure, the piston rod 832 moves in the opposite direction. Under the action of the reset member 82, the sliding rod 81 is reset. The structure is simple, convenient and efficient. At the same time, the inert gas has stable chemical properties and high safety.

[0039] Reference Figure 1 and Figure 3 Two sliding rods 81 extend from one end of the sliding groove 21 and approach each other. The mounting plate 84 is located at the end of the sliding rod 81 near the rotor 3. An intermediate plate 841 is integrally formed at the end of the mounting plate 84 facing the sliding rod 81. The intermediate plate 841 is perpendicular to the mounting plate 84 and is located between the two sliding rods 81. The end of the sliding rod 81 away from the sliding groove 21 is hinged to the intermediate plate 841. A universal ball joint 85 is provided at the end of the mounting plate 84 facing the rotor 3.

[0040] Reference Figure 1 and Figure 3 A buffer cavity 31 is provided on the end wall of the rotor 3 facing the stator 2. A buffer block 32 is provided in the buffer cavity 31. The end wall of the buffer block 32 has an annular groove 321 along the circumferential direction for the universal ball joint 85 to be embedded and slide. When the drive unit 83 is started, it will push the buffer block 32 to slide in the buffer cavity 31, thereby expanding the volume of the working cavity 4. Several sets of elastic elements 33 are provided between the buffer block 32 and the bottom wall of the buffer cavity 31. In this embodiment, the elastic elements 33 are guide rods and springs. The guide rods are connected to the bottom wall of the buffer block 32. The bottom wall of the buffer block 32 has a circular hole for the guide rod to be inserted and slide. The spring is sleeved on the circumferential wall of the guide rod and is glued to the bottom wall of the buffer block 32 and the bottom wall of the buffer cavity 31. Under the action of the elastic element 33, the buffer block 32 maintains the tendency to move towards the direction of extending out of the buffer cavity 31. When the ejection mechanism 8 is started, the elastic element 33 is compressed and accumulates elastic potential energy. The presence of the elastic element 33 allows the buffer block 32 to rotate with the rotor 3 and slide instead of the rotor 3, so as to reduce the wear between the rotor 3 and the transmission shaft and extend the service life.

[0041] Reference Figure 1 and Figure 3 The bottom wall of the buffer block 32 is provided with an elastic sealing sleeve 34. In this embodiment, the elastic sealing sleeve 34 is made of rubber. The elastic sealing sleeve 34 and the buffer block 32 are coaxially arranged. The elastic sealing sleeve 34 abuts between the buffer block 32 and the bottom wall of the buffer cavity 31 to prevent the working fluid from entering the buffer cavity 31 and prevent liquid accumulation.

[0042] The implementation principle of a high-reliability hydraulic reducer in this application embodiment is as follows: the low-temperature refrigerant in the refrigerant tank 7 exchanges heat with the heat exchange plate 6, so that the heat exchange plate 6 can maintain a low temperature, and then the temperature is transferred to one end of the heat exchange plate 6 located in the working chamber 4. The working fluid in the working chamber 4 comes into contact with the heat exchange plate 6, so that the low temperature of the heat exchange plate 6 can be exchanged to the working fluid, thereby achieving the cooling of the working fluid. When the temperature is too high, the ejection mechanism 8 is activated, expanding the volume of the working chamber 4 so that more working fluid can enter the working chamber 4. The working fluid that just enters the working chamber 4 is at a lower temperature and can exchange heat with the original working fluid, thereby reducing the overall temperature. The two cooling structures work together to maintain the braking performance of the hydraulic reducer and improve the safety and reliability of the hydraulic reducer.

[0043] 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 high-reliability hydraulic reducer, comprising a reducer body (1), the reducer body (1) comprising a stator (2) and a rotor (3), wherein a working cavity (4) is formed between the stator (2) and the rotor (3), characterized in that: The reducer body (1) is provided with a cooling cover (5) on its outer wall. The cooling cover (5) is arranged along the circumferential direction of the stator (2) and the rotor (3). The cooling cover (5) has an inlet (51) and an outlet (52) for the working fluid to enter and exit the working chamber (4). The cooling cover (5) is provided with a plurality of heat exchange fins (6). One end of the heat exchange fins (6) passes through the cooling cover (5) and is inserted into the working chamber (4). The cooling cover (5) is provided with a refrigerant tank (7) on its outer wall. The heat exchange plate (6) has a snap-fit ​​block (61) on its side wall, and the outer wall of the cooling cover (5) has a first clearance groove (53) for the lower end of the snap-fit ​​block (61) to be embedded in. The bottom wall of the refrigerant tank (7) is in contact with the outer wall of the cooling cover (5), and the bottom wall of the refrigerant tank (7) has a second clearance groove (71) for the upper end of the snap-fit ​​block (61) to be embedded in. The refrigerant tank (7) is provided with fasteners (72) for fixing the refrigerant tank (7) to the cooling cover (5); the cooling cover (5) The inner wall is provided with several elastic sealing rings (54), each elastic sealing ring (54) corresponding to a heat exchange plate (6). The inner wall of the elastic sealing ring (54) converges towards the center. One end of the heat exchange plate (6) inserted into the working cavity (4) passes through the corresponding elastic sealing ring (54), and the inner wall of the elastic sealing ring (54) abuts against the outer wall of the heat exchange plate (6). The end wall of the heat exchange plate (6) inserted into the working cavity (4) is provided with a pointed tip (62). One end of the heat sink (6) extending out of the cooling cover (5) is inserted into the refrigerant tank (7); a liquid pump (73) is provided on the outer wall of the refrigerant tank (7), the input end of the liquid pump (73) is connected to the refrigerant tank (7), the output end of the liquid pump (73) is connected to a spiral cooling pipe (74), and the other end of the spiral cooling pipe (74) is connected to the refrigerant tank (7); the end wall of the stator (2) facing the rotor (3) is provided with several ejection mechanisms (8) for changing the volume of the working chamber (4).

2. The high-reliability hydraulic reducer according to claim 1, characterized in that: The ejection mechanism (8) includes two sliding rods (81), a reset member (82), two sets of driving members (83), a mounting plate (84), and a universal ball joint (85). The sliding rods (81) and the driving members (83) correspond one-to-one. The stator (2) end wall is provided with a sliding groove (21). One end of each of the two sliding rods (81) is slidably connected in the sliding groove (21). The reset member (82) is disposed in the sliding groove (21) and abuts against the two sliding rods (81). The reset member (82) makes the two sliding rods (81) tend to slide in opposite directions. The driving member (83) is disposed on the side of the corresponding sliding rod (81) that is opposite to the other sliding rod (81). On one side, the driving member (83) is used to drive the two sliding rods (81) to slide in a direction that approaches each other. The two sliding rods (81) extend one end out of the sliding groove (21) and approach each other. The mounting plate (84) is located at the end of the sliding rod (81) near the rotor (3). The mounting plate (84) is provided with an intermediate plate (841) at the end facing the sliding rod (81). The intermediate plate (841) is located between the two sliding rods (81). The sliding rod (81) is hinged to the intermediate plate (841). The universal ball joint (85) is provided at the end of the mounting plate (84) facing the rotor (3). The end wall of the rotor (3) is provided with an annular groove (321) along the circumferential direction for the universal ball joint (85) to be embedded and slide.

3. A high-reliability hydraulic reducer according to claim 2, characterized in that: The drive unit (83) includes a piston tube (831) and a piston rod (832). The piston tube (831) is connected to the inner wall of the sliding groove (21). The piston rod (832) is slidably connected inside the piston tube (831). One end of the piston rod (832) extending out of the piston tube (831) is hinged to a corresponding sliding rod (81). The piston tube (831) is filled with inert gas.

4. A high-reliability hydraulic reducer according to claim 3, characterized in that: The piston tube (831) is made of silicon carbide.

5. A high-reliability hydraulic reducer according to claim 2, characterized in that: The rotor (3) has a buffer cavity (31) on the end wall facing the stator (2). A buffer block (32) is provided in the buffer cavity (31). An elastic element (33) is provided between the buffer block (32) and the bottom wall of the buffer cavity (31). The elastic element (33) makes the buffer block (32) maintain the tendency of movement towards the direction of extending out of the buffer cavity (31). The annular groove (321) is opened on the surface of the buffer block (32).

6. A high-reliability hydraulic reducer according to claim 5, characterized in that: The bottom wall of the buffer block (32) is provided with an elastic sealing sleeve (34), which is coaxial with the buffer block (32) and abuts against the bottom wall of the buffer block (32) and the buffer cavity (31).

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