A safety hydraulic cylinder for a hydraulic disc brake

Abstract

The present invention discloses a safety hydraulic cylinder for a hydraulic disc brake, which includes a hydraulic cylinder body. A piston rod for supporting is arranged inside the hydraulic cylinder body. A sealing mechanism is arranged between the piston rod and the hydraulic cylinder body. The sealing mechanism includes a mounting plate installed at the top end of the hydraulic cylinder body. A sealing member for closing the piston rod is arranged between the piston rod and the mounting plate. An annular groove for relieving the stress received is formed on the outer surface of the sealing member, and a plurality of air holes for exhausting air are formed inside the annular groove. By forming a groove and air holes on the outer surface of the sealing member, the present invention can effectively relieve the stress received by the sealing member during installation and use. At the same time, the sealing member is dynamically pressurized by the flow of hydraulic oil inside the hydraulic cylinder. This mechanism can automatically adjust the sealing pressure according to the working state of the hydraulic cylinder to ensure good sealing effect under any working conditions.

Description

Technical Field

[0001] The present invention relates to a hydraulic cylinder, and particularly to a safety hydraulic cylinder for a hydraulic disc brake. Background Art

[0002] In a hydraulic transmission system, the safety hydraulic cylinder of a hydraulic disc brake plays a crucial role. It can not only provide stable braking force, but also ensure the safety and reliability of the entire hydraulic system.

[0003] In a traditional hydraulic cylinder, the piston rod and the cylinder body are usually sealed by a rubber gasket or an O-ring. However, during long-term use, due to the pressure of the hydraulic oil and the frequent movement of the piston rod, the rubber gasket or O-ring is prone to wear due to large stress and friction, resulting in a decrease in the sealing effect and causing hydraulic oil leakage. This not only affects the normal operation of the hydraulic cylinder, but may also damage other components of the hydraulic system, reducing the reliability and safety of the entire system. Summary of the Invention

[0004] The purpose of the present invention is to provide a safety hydraulic cylinder for a hydraulic disc brake to solve the problem that due to the pressure of the hydraulic oil and the frequent movement of the piston rod, the rubber gasket or O-ring is prone to wear due to large stress and friction, resulting in a decrease in the sealing effect and causing hydraulic oil leakage as mentioned in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A safety hydraulic cylinder for a hydraulic disc brake, including a hydraulic cylinder body. A piston rod for a supporting function is arranged inside the hydraulic cylinder body. A sealing mechanism is arranged between the piston rod and the hydraulic cylinder body. The sealing mechanism includes a mounting plate installed at the top end of the hydraulic cylinder body. A sealing member for closing the piston rod is arranged between the piston rod and the mounting plate. An annular groove for relieving the stress received is formed on the outer surface of the sealing member. A plurality of air holes for exhausting air are formed inside the annular groove. A pressurizing component is arranged inside the mounting plate. The pressurizing component includes a telescopic cylinder installed inside the mounting plate. A telescopic rod slides through the free end of the telescopic cylinder. A pressing plate for applying pressure to the sealing member is installed at one end of the telescopic rod. A through groove for providing the flow of hydraulic oil is formed between the telescopic cylinder and the inner cavity of the hydraulic cylinder body.

[0006] As a preferred technical solution of the present invention, a liquid passing component is arranged inside the mounting plate close to the telescopic cylinder. The liquid passing component includes a baffle plate arranged at one end of the telescopic cylinder. A first spring is fixedly installed between the baffle plate and the mounting plate. A liquid fixing groove is formed on the surface of the mounting plate close to the through groove. A rotating plate is rotatably installed on the surface of the mounting plate close to the baffle plate. One end of the rotating plate is connected to the baffle plate through a connecting rope, and the free end of the rotating plate rotates inside the liquid fixing groove.

[0007] As a preferred technical solution of the present invention, a collecting pipe is installed inside the mounting plate close to the liquid fixing groove. An exhaust pipe is connected and installed between the collecting pipe and the liquid fixing groove. An exhaust groove communicating with the outside is formed inside the mounting plate. One end of the collecting pipe is communicated with the exhaust groove.

[0008] As a preferred technical solution of the present invention, a top plate is installed at the free end of the hydraulic cylinder body. The mounting plate is arranged between the top plate and the hydraulic cylinder body. A first rubber ring is arranged between the mounting plate and the hydraulic cylinder body.

[0009] As a preferred technical solution of the present invention, a lubricating component is arranged inside the mounting plate. The lubricating component includes a second rubber ring installed on the inner wall of the mounting plate. A support ring is fixedly installed between the seal and the second rubber ring. A roller is rotatably installed on the outer surface of the support ring. The roller slides on the outer surface of the piston rod.

[0010] As a preferred technical solution of the present invention, a moving mechanism is arranged inside the hydraulic cylinder body. The moving mechanism includes a piston plate slidably installed in the inner cavity of the hydraulic cylinder body. The piston rod is fixedly installed on the surface of the piston plate. A groove is formed on the outer surface of the piston plate. A triangular washer is installed inside the groove.

[0011] As a preferred technical solution of the present invention, a pressure-resistant mechanism is arranged at the bottom end of the hydraulic cylinder body. The pressure-resistant mechanism includes a base filled with hydraulic oil fixedly installed at the bottom end of the hydraulic cylinder body. A moving plate is slidably installed inside the base. A plurality of liquid outlet holes are formed on the surface of the moving plate. A first positive magnetic block is fixedly installed on the surface of the piston plate close to the moving plate. A second positive magnetic block is fixedly installed at the top end of the moving plate.

[0012] As a preferred technical solution of the present invention, a buffer component is arranged inside the pressure-resistant mechanism. The buffer component includes a cylinder fixedly installed at the bottom end of the hydraulic cylinder body. A sliding rod slidably penetrates through one end of the cylinder close to the piston plate. A second spring is fixedly installed between the end of the sliding rod located inside the cylinder and the cylinder.

[0013] As a preferred technical solution of the present invention, a connecting pipe is installed in communication between multiple said cylinders, a plurality of air bags are arranged on the inner bottom wall of the base, and an air guide pipe is installed in communication between the air bag and the connecting pipe.

[0014] As a preferred technical solution of the present invention, a liquid inlet pipe and a liquid outlet pipe are installed in communication on the outer surface of the hydraulic cylinder body, one-way valves are arranged on the outer surfaces of the liquid inlet pipe and the liquid outlet pipe, and the liquid inlet pipe and the liquid outlet pipe are respectively located at both ends of the moving mechanism.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. By providing grooves and ventilation holes on the outer surface of the seal, the present invention can effectively relieve the stress on the seal during installation and use, thereby extending its service life. This design not only improves the durability of the seal but also significantly enhances the sealing effect between the piston rod and the hydraulic cylinder, preventing hydraulic oil leakage and ensuring the stability and safety of the hydraulic system.

[0017] 2. The present invention drives the telescopic rod and the pressing plate through the flow of hydraulic oil inside the hydraulic cylinder to dynamically pressurize the seal. This mechanism can automatically adjust the sealing pressure according to the working state of the hydraulic cylinder, ensuring a good sealing effect under any working conditions and further improving the reliability and stability of the equipment.

[0018] 3. By providing grooves on the outer surface of the piston plate and installing triangular washers, the present invention not only increases the contact area between the piston plate and the inner wall of the hydraulic cylinder but also improves the stability of the piston plate based on the principle of the stability of a triangle. At the same time, the presence of the triangular washer also enhances the sealing effect and reduces the risk of hydraulic oil leakage.

[0019] 4. By installing a base and a moving plate at the bottom end of the hydraulic cylinder and utilizing the principle of magnetic blocks with the same poles repelling each other, and at the same time cooperating with the downward pressure of the moving plate with through holes in the hydraulic oil, the flow will cause the liquid to exert a reaction force on the sliding plate, thereby playing a buffering role, not only reducing the impact and vibration of the piston rod during movement but also achieving a buffering effect on the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a schematic diagram of the internal structure of the hydraulic cylinder body of the present invention;

[0022] Figure 3 is a schematic diagram of the internal structure of the mounting plate of the present invention;

[0023] Figure 4 is of the present inventionFigure 3 Schematic diagram of the structure at position A in

[0024] Figure 5 Schematic diagram of the sealing plate structure of the present invention;

[0025] Figure 6 of the present invention Figure 5 Schematic diagram of the structure at position B in

[0026] Figure 7 Schematic diagram of the pressing plate structure of the present invention;

[0027] Figure 8 Schematic diagram of the internal structure of the base of the present invention;

[0028] Figure 9 Schematic diagram of the piston plate structure of the present invention;

[0029] Figure 10 Schematic diagram of the cross-sectional structure of the piston plate of the present invention.

[0030] In the figure: 1. Hydraulic cylinder body; 2. Liquid inlet pipe; 3. Liquid outlet pipe; 4. Piston rod; 5. Moving mechanism; 51. Piston plate; 52. Groove; 53. Triangular washer; 6. Top plate; 7. Sealing mechanism; 71. Mounting plate; 72. First rubber ring; 73. Sealing element; 74. Pressurizing assembly; 741. Telescopic cylinder; 742. Telescopic rod; 743. Pressing plate; 744. Through groove; 75. Liquid conducting assembly; 751. Baffle; 752. First spring; 753. Liquid retaining groove; 754. Rotating plate; 755. Collection pipe; 756. Exhaust pipe; 757. Exhaust groove; 76. Lubricating assembly; 761. Second rubber ring; 762. Support ring; 763. Roller; 8. Pressure-resistant mechanism; 81. First positive magnetic block; 82. Second positive magnetic block; 83. Liquid outlet hole; 84. Moving plate; 85. Buffer assembly; 851. Slide bar; 852. Cylinder; 853. Second spring; 854. Connecting pipe; 855. Air bag; 856. Air guide pipe; 86. Base. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figure 1-10, the present invention provides a safety hydraulic cylinder for a hydraulic disc brake, which includes a hydraulic cylinder body 1. Inside the hydraulic cylinder body 1, there is a piston rod 4 for support. Between the piston rod 4 and the hydraulic cylinder body 1, there is a sealing mechanism 7. The sealing mechanism 7 includes a mounting plate 71 installed at the top of the hydraulic cylinder body 1. Between the piston rod 4 and the mounting plate 71, there is a sealing member 73 for closing the piston rod 4. On the outer surface of the sealing member 73, there is an annular groove for relieving the stress received, and inside the annular groove, there are multiple air holes for exhausting air.

[0033] Among them, by setting the sealing member 73 and the annular groove, the hydraulic cylinder can tightly seal the piston rod 4 to prevent the leakage of hydraulic oil, which ensures that the hydraulic cylinder can still maintain good sealing performance under high pressure, thereby improving the stability and reliability of the entire hydraulic system; the design of the annular groove relieves the stress on the sealing member 73, reduces the risk of damage due to stress concentration, thereby prolonging the service life of the sealing member 73, reducing the replacement frequency, and thus reducing the maintenance cost; by opening air holes to exhaust the gas inside the hydraulic cylinder, the stable pressure inside the system can be maintained, thereby reducing the vibration and noise generated by gas impact and improving the running smoothness of the entire hydraulic system.

[0034] In the technical solution of the embodiment of the present application, a pressurizing component 74 is arranged inside the mounting plate 71. The pressurizing component 74 includes a telescopic cylinder 741 installed inside the mounting plate 71. A telescopic rod 742 slides through the free end of the telescopic cylinder 741. One end of the telescopic rod 742 is installed with a pressing plate 743 for applying pressure to the sealing member 73. A through groove 744 for providing the flow of hydraulic oil is opened between the telescopic cylinder 741 and the inner cavity of the hydraulic cylinder body 1.

[0035] Among them, when the hydraulic cylinder body 1 is in use, a part of the hydraulic oil will be compressed into the telescopic cylinder 741. The telescopic rod 742 and the pressing plate 743 are driven by the flow of the hydraulic oil inside the hydraulic cylinder to dynamically pressurize the sealing member 73. This mechanism can automatically adjust the sealing pressure according to the working state of the hydraulic cylinder to ensure good sealing effect under any working conditions, further improving the reliability and stability of the equipment.

[0036] In some other embodiments, a liquid passing component 75 is arranged inside the mounting plate 71 close to the telescopic cylinder 741. The liquid passing component 75 includes a baffle 751 arranged at one end of the telescopic cylinder 741. A first spring 752 is fixedly installed between the baffle 751 and the mounting plate 71. A liquid fixing groove 753 is opened on the surface of the mounting plate 71 close to the through groove 744. A rotating plate 754 is rotatably installed on the surface of the mounting plate 71 close to the baffle 751. One end of the rotating plate 754 is connected to the baffle 751 by a connecting rope, and the free end of the rotating plate 754 rotates inside the liquid fixing groove 753.

[0037] Among them, when the hydraulic cylinder body 1 is in use, hydraulic oil will be synchronously introduced into the fixed liquid tank 753, thereby driving the rotating plate 754 to rotate. The rotating plate 754 will drive the baffle plate 751 to move, so as to synchronously open a plurality of telescopic cylinders 741 inside the mounting plate 71. At this time, the flow rate and capacity of the liquid entering the telescopic cylinder 741 are the same, so that the pressing plate 743 applies the same pressure to the seal 73, improving the tightness and uniformity of each part of the seal 73, and further improving the sealing effect.

[0038] In some other embodiments, a collecting pipe 755 is installed inside the mounting plate 71 near the fixed liquid tank 753. An exhaust pipe 756 is connected between the collecting pipe 755 and the fixed liquid tank 753. An exhaust groove 757 communicating with the outside is opened inside the mounting plate 71. One end of the collecting pipe 755 is communicated with the exhaust groove 757.

[0039] Among them, when the rotating plate 754 rotates, the air inside the fixed liquid tank 753 will be discharged into the exhaust groove 757, thus avoiding excessive pressure inside the fixed liquid tank 753 and affecting the rotation of the rotating plate 754. At the same time, after exhausting, no external force enters. At this time, the stability of the rotating plate 754 after rotation can be ensured, and the rotating plate 754 is prevented from immediately resetting after rotation, thereby affecting the feeding inside the telescopic cylinder 741 and resulting in uneven pressure.

[0040] In some other embodiments, a top plate 6 is installed at the free end of the hydraulic cylinder body 1. The mounting plate 71 is arranged between the top plate 6 and the hydraulic cylinder body 1. A first rubber ring 72 is arranged between the mounting plate 71 and the hydraulic cylinder body 1.

[0041] Among them, the top plate 6 can be used to fix the mounting plate 71, and it is also convenient to replace and use the mounting plate 71 and the parts inside the mounting plate 71; through the first rubber ring 72, hydraulic oil leakage can be avoided, ensuring the seal between the mounting plate 71 and the hydraulic cylinder body 1.

[0042] In some other embodiments, a lubrication assembly 76 is arranged inside the mounting plate 71. The lubrication assembly 76 includes a second rubber ring 761 installed on the inner wall of the mounting plate 71. A support ring 762 is fixedly installed between the seal 73 and the second rubber ring 761. A roller 763 is rotatably installed on the outer surface of the support ring 762. The roller 763 slides on the outer surface of the piston rod 4.

[0043] Among them, by providing the roller 763, when the seal 73 is in close contact with the piston rod 4, the roller 763 can support and assist the movement of the piston rod 4, avoiding excessive tightness between the piston rod 4 and the seal 73, resulting in excessive resistance during the use of the hydraulic cylinder body 1 and affecting the telescopic use of the hydraulic cylinder body 1.

[0044] In some other embodiments, an actuating mechanism 5 is provided inside the hydraulic cylinder body 1. The actuating mechanism 5 includes a piston plate 51 slidably mounted in the inner cavity of the hydraulic cylinder body 1. A piston rod 4 is fixedly mounted on the surface of the piston plate 51. A groove 52 is formed on the outer surface of the piston plate 51, and a triangular washer 53 is installed inside the groove 52.

[0045] Among them, forming the groove 52 on the outer surface of the piston plate 51 and installing the triangular washer 53 not only increases the contact area between the piston plate 51 and the inner wall of the hydraulic cylinder, but also improves the stability of the piston plate 51 through the principle of the stability of a triangle. At the same time, the presence of the triangular washer 53 also enhances the sealing effect and reduces the risk of hydraulic oil leakage.

[0046] In some other embodiments, a pressure-resistant mechanism 8 is provided at the bottom end of the hydraulic cylinder body 1. The pressure-resistant mechanism 8 includes a base 86 filled with hydraulic oil fixedly mounted at the bottom end of the hydraulic cylinder body 1. A moving plate 84 is slidably mounted inside the base 86. A plurality of liquid outlet holes 83 are formed on the surface of the moving plate 84. A first positive magnetic block 81 is fixedly mounted on the surface of the piston plate 51 close to the moving plate 84, and a second positive magnetic block 82 is fixedly mounted at the top end of the moving plate 84.

[0047] Among them, using the principle of like poles repelling each other in magnets, and at the same time cooperating with the downward pressure of the moving plate 84 with through holes in the liquid oil, the flow will cause the liquid to exert a reaction force on the moving plate 84, and this reaction force is opposite to the moving direction of the moving plate 84, thereby playing a buffering role. This design not only reduces the impact and vibration of the piston rod 4 during movement, achieves the buffering effect on the piston rod 4, but also improves the overall stability and service life of the equipment.

[0048] In some other embodiments, a buffer assembly 85 is provided inside the pressure-resistant mechanism 8. The buffer assembly 85 includes a cylinder 852 fixedly mounted at the bottom end of the hydraulic cylinder body 1. A slide rod 851 slidably penetrates through one end of the cylinder 852 close to the piston plate 51. A second spring 853 is fixedly mounted between the end of the slide rod 851 located inside the cylinder 852 and the cylinder 852.

[0049] Among them, when the piston plate 51 moves, the elastic force of the second spring 853 enables the piston plate 51 to move smoothly during the operation of the hydraulic cylinder body 1. The rapid movement of the piston plate 51 may generate a large impact force, and the elastic force of the second spring 853 can absorb and disperse this part of the impact force, so that the piston plate 51 is more stable during the movement, thereby reducing the impact on the hydraulic cylinder body 1 and other mechanical parts, and helping to protect the stability and safety of the entire mechanical system; in some cases, when the hydraulic cylinder body 1 loses the effect of the hydraulic oil, the piston plate 51 needs to return to its original position, and the second spring 853 can provide the necessary elastic force to help the piston plate 51 smoothly return to its initial state, thereby ensuring the normal operation of the mechanical system.

[0050] In other embodiments, a connecting tube 854 is installed between the multiple cylinders 852 , a multiple airbags 855 are provided on the inner bottom wall of the base 86 , and an air guide tube 856 is installed between the airbags 855 and the connecting tube 854 .

[0051] When the piston plate 51 is pressed down, the slide rod 851 will compress the inside of the cylinder 852, thereby leading out the airflow in the cylinder 852, and filling the gas into the airbag 855 through the air duct 856, so that the airbag 855 inside the base 86 is inflated and expanded. At this time, the expanded airbag 855 can further cushion the movement of the piston rod 4, thereby improving the stability of the movement of the piston rod 4.

[0052] In other embodiments, the outer surface of the hydraulic cylinder body 1 is connected to a liquid inlet pipe 2 and a liquid outlet pipe 3, and the outer surfaces of the liquid inlet pipe 2 and the liquid outlet pipe 3 are both provided with a one-way valve, and the liquid inlet pipe 2 and the liquid outlet pipe 3 are respectively located at the two ends of the movable mechanism 5.

[0053] Among them, the liquid inlet pipe 2 is responsible for introducing high-pressure oil into the inner cavity of the hydraulic cylinder body 1, and the setting of the one-way valve ensures that the oil can only flow into the hydraulic cylinder body 1 from the liquid inlet pipe 2, and cannot flow out in the opposite direction; the liquid outlet pipe 3 is responsible for discharging the low-pressure oil in the inner cavity of the hydraulic cylinder body 1. Similarly, the setting of the one-way valve ensures that the oil can only flow out from the inner cavity of the hydraulic cylinder body 1 through the liquid outlet pipe 3, and cannot flow in in the opposite direction, which helps to maintain the pressure balance in the inner cavity of the hydraulic cylinder body 1 and ensures that the piston plate 51 will not be subject to unnecessary resistance during movement, which ensures that the hydraulic cylinder body 1 can obtain a stable supply of oil when pushing the piston plate 51 to move.

[0054] The working principle is:

[0055] When the hydraulic cylinder body 1 is in use, high-pressure hydraulic fluid is introduced into the inner cavity of the hydraulic cylinder body 1 on one side of the piston plate 51 through the liquid inlet pipe 2 at this time. Meanwhile, the hydraulic oil on one side of the piston plate 51 of the hydraulic cylinder body 1 is discharged from the liquid outlet pipe 3, so as to form a liquid balance inside the hydraulic cylinder body 1, thereby driving the piston plate 51 to move inside the hydraulic cylinder body 1. The movement of the piston plate 51 will drive the piston rod 4 to move, thus realizing the operation of the hydraulic cylinder body 1. At this time, when the hydraulic cylinder body 1 is operating, part of the hydraulic oil will be introduced into the inside of the telescopic cylinder 741 through the through groove 744, so as to apply pressure inside the telescopic cylinder 741, thereby driving the pressing plate 743 to move. The dynamic pressure on the seal 73 on the surface of the piston rod 4 by the pressing plate 743 can automatically adjust the sealing pressure according to the working state of the hydraulic cylinder, ensuring good sealing effect under any working conditions. Further, by arranging a perforated moving plate 84 and an airbag 855 inside the base 86, when the piston plate 51 is retracted, the downward pressure of the moving plate 84 in the hydraulic oil will cause the liquid to exert a reaction force on the moving plate 84, and this reaction force is opposite to the moving direction of the moving plate 84, thus playing a buffering role. The airbag 855 will also expand synchronously for buffering, thereby improving the overall stability of the equipment.

[0056] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all covered by the protection scope of the present invention.

Claims

1. A safety hydraulic cylinder for a hydraulic disc brake, comprising a hydraulic cylinder body (1), characterized in that: A piston rod (4) for supporting is arranged inside the hydraulic cylinder body (1), a sealing mechanism (7) is arranged between the piston rod (4) and the hydraulic cylinder body (1), the sealing mechanism (7) comprises a mounting plate (71) mounted on the top of the hydraulic cylinder body (1), a sealing member (73) for sealing the piston rod (4) is arranged between the piston rod (4) and the mounting plate (71), an annular groove for relieving stress is provided on the outer surface of the sealing member (73), and a plurality of air holes for exhausting air are provided inside the annular groove; A pressurizing assembly (74) is arranged inside the mounting plate (71), and the pressurizing assembly (74) comprises a telescopic cylinder (741) mounted inside the mounting plate (71), a telescopic rod (742) slidingly passing through the free end of the telescopic cylinder (741), a pressure plate (743) for applying pressure to the sealing element (73) being mounted at one end of the telescopic rod (742), and a through groove (744) for providing flow of hydraulic oil is provided between the telescopic cylinder (741) and the inner cavity of the hydraulic cylinder body (1); A liquid-passing assembly (75) is arranged inside the mounting plate (71) near the telescopic cylinder (741), and the liquid-passing assembly (75) comprises a baffle (751) arranged at one end of the telescopic cylinder (741), a first spring (752) is fixedly installed between the baffle (751) and the mounting plate (71), a fixed liquid groove (753) is provided on the surface of the mounting plate (71) near the through groove (744), and a rotating plate (754) is rotatably installed on the surface of the mounting plate (71) near the baffle (751), one end of the rotating plate (754) is connected to the baffle (751) by a connecting rope, and the free end of the rotating plate (754) rotates inside the fixed liquid groove (753); A collecting pipe (755) is installed inside the mounting plate (71) near the fixed liquid tank (753); an exhaust pipe (756) is installed in communication between the collecting pipe (755) and the fixed liquid tank (753); an exhaust groove (757) communicating with the outside is provided inside the mounting plate (71); one end of the collecting pipe (755) is in communication with the exhaust groove (757); The outer surface of the hydraulic cylinder body (1) is connected to and installed with a liquid inlet pipe (2) and a liquid outlet pipe (3), and the outer surfaces of the liquid inlet pipe (2) and the liquid outlet pipe (3) are both provided with a one-way valve, and the liquid inlet pipe (2) and the liquid outlet pipe (3) are respectively located at two ends of the movable mechanism (5).

2. A safety hydraulic cylinder for hydraulic disc brakes according to claim 1, characterized in that: A top plate (6) is mounted on the free end of the hydraulic cylinder body (1); the mounting plate (71) is arranged between the top plate (6) and the hydraulic cylinder body (1); and a first rubber ring (72) is arranged between the mounting plate (71) and the hydraulic cylinder body (1).

3. The safety hydraulic cylinder for hydraulic disc brake according to claim 1, characterized in that: A lubrication assembly (76) is arranged inside the mounting plate (71), and the lubrication assembly (76) comprises a second rubber ring (761) mounted on the inner wall of the mounting plate (71), a support ring (762) is fixedly mounted between the sealing member (73) and the second rubber ring (761), and a roller (763) is rotatably mounted on the outer surface of the support ring (762), and the roller (763) slides on the outer surface of the piston rod (4).

4. The safety hydraulic cylinder for hydraulic disc brake according to claim 1, characterized in that: A movable mechanism (5) is arranged inside the hydraulic cylinder body (1), and the movable mechanism (5) comprises a piston plate (51) slidably mounted in the inner cavity of the hydraulic cylinder body (1); the piston rod (4) is fixedly mounted on the surface of the piston plate (51); a groove (52) is formed on the outer surface of the piston plate (51); and a triangular washer (53) is mounted inside the groove (52).

5. A safety hydraulic cylinder for hydraulic disc brakes according to claim 4, characterized in that: A pressure-resistant mechanism (8) is provided at the bottom end of the hydraulic cylinder body (1), and the pressure-resistant mechanism (8) comprises a base (86) filled with hydraulic oil and fixedly mounted at the bottom end of the hydraulic cylinder body (1); a movable plate (84) is slidably mounted inside the base (86); a plurality of liquid outlet holes (83) are provided on the surface of the movable plate (84); a first positive magnetic block (81) is fixedly mounted on the surface of the piston plate (51) close to the movable plate (84); and a second positive magnetic block (82) is fixedly mounted on the top end of the movable plate (84).

6. A safety hydraulic cylinder for hydraulic disc brakes according to claim 5, characterized in that: A buffer assembly (85) is provided inside the pressure-resistant mechanism (8), and the buffer assembly (85) comprises a cylinder (852) fixedly mounted on the bottom end of the hydraulic cylinder body (1), a sliding rod (851) slidingly passing through one end of the cylinder (852) close to the piston plate (51), and a second spring (853) fixedly mounted between one end of the sliding rod (851) located inside the cylinder (852) and the cylinder (852).

7. A safety hydraulic cylinder for hydraulic disc brakes according to claim 6, characterized in that: A connecting tube (854) is installed in communication between the plurality of cylinders (852), a plurality of air bags (855) are provided on the inner bottom wall of the base (86), and an air guide tube (856) is installed in communication between the air bags (855) and the connecting tube (854).

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