Mute hinge

Abstract

The utility model relates to the technical field of hinges, in particular to a mute hinge which comprises a hinge body, the hinge body comprises a pressing rod, an inner rocker arm and a silencing ring, the pressing rod and the inner rocker arm are assembled, the two ends of the pressing rod are both exposed out of the two side walls of the inner rocker arm, and the silencing ring is arranged on the pressing rod. The noise reduction ring is arranged at one end of the pressing rod in a sleeving mode and used for abutting against a torsion arm of a torsion spring, the noise reduction ring is made of a high polymer material, the pressing rod is made of a metal material, the outer diameter of the pressing rod is larger than or equal to the wire diameter of the torsion spring, and friction noise between the metal pressing rod and the metal torsion spring in the opening and closing process of the hinge is reduced. The compression bar made of metal materials is adopted, the overall strength of the compression bar is improved, the silencing ring and the compression bar are arranged in a sleeving mode, assembling is simple, the assembling efficiency is improved, the rigidity and durability of an original metal compression bar are kept, meanwhile, using noise is effectively reduced through the silencing ring made of high polymer materials, and the service life of the compression bar is prolonged. And the balance between performance and cost is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of hinges, in particular to a silent hinge. Background Art

[0002] A hinge, as a basic mechanical connection element, is widely used in various fields such as furniture, doors and windows, and mechanical equipment. Its main function is to connect two components and allow them to rotate relative to each other within a certain range. In daily life, the performance of the hinge directly affects the service life of the product and the user experience;

[0003] In order to improve the user experience, a hydraulic buffer hinge has been introduced on the market. This product can provide a buffering function when the cabinet door is closed, effectively reducing the noise generated by the collision between the cabinet door and the cabinet body, and at the same time protecting the cabinet door and the cabinet body from impact damage. The composition of the existing hydraulic buffer hinge includes components such as a hinge arm, a hinge cup, a buffer, an inner rocker arm, a circular torsion spring, a connecting pin, etc. The inner rocker arm is riveted to the hinge arm through a rotating shaft, and the rotating shaft forms the rotation center of the inner rocker arm. One end of the inner rocker arm is assembled with the hinge cup through a U-shaped pin, and one end of the inner rocker arm is assembled with the piston rod of the buffer to achieve the buffering effect. The pressure rod is assembled with the inner rocker arm and is used to press the first torsion arm of the circular torsion spring, while the second torsion arm of the torsion spring abuts against the inner wall of the hinge arm. The connecting pin passes through the inner circle of the circular torsion spring to assemble the torsion spring with the hinge arm, thereby controlling the opening and closing speed and force of the hinge and achieving the effect of buffering and noise reduction;

[0004] Regarding the above related technologies, the inventor believes that the existing hydraulic buffer hinge has the following defects. Both the pressure rod and the circular torsion spring are made of metal. During the opening and closing process of the hinge, relative movement occurs between the pressure rod and the first torsion arm of the torsion spring, that is, the pressure rod moves back and forth along the first torsion arm. Due to the relatively high friction coefficient between metals, this relative movement will cause vibration and noise during the opening and closing process of the hinge, affecting the user experience; in addition, the pressure rod is cylindrical and is in line contact with the first torsion arm of the circular torsion spring. This contact method makes the force on the pressure rod uneven and prone to bending deformation. After deformation, the assembly gap between the pressure rod and the torsion spring changes, affecting the smooth opening and closing of the hydraulic buffer hinge, thereby increasing the possibility of generating noise during the opening and closing process of the hinge. Summary of the Utility Model

[0005] In order to reduce the noise during the opening and closing of the hinge and improve the user experience, this application provides a silent hinge.

[0006] A silent hinge provided by the utility model adopts the following technical solutions:

[0007] A silent hinge, comprising a hinge body, the hinge body including a pressure rod, an inner rocker arm, and a sound insulation ring. The pressure rod is assembled with the inner rocker arm, and both ends of the pressure rod are exposed on both side walls of the inner rocker arm. The sound insulation ring is sleeved on one end of the pressure rod and is used to abut against the torsion arm of a torsion spring. The sound insulation ring is made of a polymer material, the pressure rod is made of a metal material, and the outer diameter of the pressure rod is greater than or equal to the wire diameter of the torsion spring.

[0008] Preferably, the pressure rod is cylindrical, and the outer diameter of the pressure rod is 1.7 - 1.8 times the wire diameter of the torsion spring.

[0009] Preferably, the inner rocker arm is provided with an assembly hole, the inner diameter of the assembly hole is equal to the outer diameter of the pressure rod, the pressure rod is provided with an assembly portion for interference fitting with the inner wall of the assembly hole, and the outer diameter of the assembly portion is 1.02 - 1.05 times the outer diameter of the pressure rod.

[0010] Preferably, the assembly portion is provided with several groups of grooves, the grooves are recessed from the outside to the inside, and when there are multiple groups of grooves, the multiple groups of grooves are equally angularly spaced on the assembly portion with the axis of the pressure rod as the center.

[0011] Preferably, the axial length of the assembly portion is greater than or equal to the axial length of the assembly hole.

[0012] Preferably, the torsion spring is a square torsion spring, the sound insulation ring is provided with a flat portion for abutting against the torsion spring, and the flat portion is arranged along the axis of the sound insulation ring.

[0013] Preferably, the pressure rod is provided with a first assembly plane, the first assembly plane is arranged parallel to the flat portion, the inner wall of the assembly hole is provided with a second assembly plane, and the second assembly plane is arranged parallel to the torsion arm of the torsion spring.

[0014] Preferably, the pressure rod is provided with a limiting flange, the limiting flange is arranged at one end of the pressure rod close to the sound insulation ring, and the limiting flange protrudes from the end wall of the pressure rod along the radial direction of the pressure rod.

[0015] Preferably, it further includes a ball. The end wall of the pressure rod is provided with a ball groove for assembling the ball. When the ball is rollingly assembled in the ball groove, part of the ball is exposed from the end wall of the pressure rod.

[0016] Preferably, the sound insulation ring is made of polytetrafluoroethylene.

[0017] The beneficial effects of the present utility model are:

[0018] By setting a sound-absorbing ring made of polymer material, the frictional noise between the metal pressure rod and the metal torsion spring during the opening and closing of the hinge is reduced, providing a quieter usage experience. Especially in environments where quietness needs to be maintained, such as hospitals, libraries, etc. Secondly, the pressure rod made of metal material ensures the necessary rigidity for abutting against the torsion spring, enhancing the overall strength of the pressure rod. The sound-absorbing ring and the pressure rod are sleeved, with simple assembly, improving the assembly efficiency. While maintaining the rigidity and durability of the original metal pressure rod, the use noise is effectively reduced by the sound-absorbing ring made of polymer material, achieving a balance between performance and cost;

[0019] By designing the outer diameter of the pressure rod and the wire diameter of the torsion spring, the rigidity of the pressure rod is effectively enhanced, enabling the pressure rod to better resist the elastic force of the torsion spring during the opening and closing of the hinge, avoiding breakage caused by excessive force, thereby enhancing the stability of the entire hinge structure. Secondly, due to the enhanced rigidity of the pressure rod, the possibility of bending and deformation during its use is reduced, which helps to ensure the extension of the service life of the hinge, reduce the frequency of maintenance and replacement, thereby reducing the noise and vibration caused by deformation, enhancing the user's usage experience, and maintaining the smoothness of the hinge operation, avoiding jamming phenomena caused by the deformation of the pressure rod. Brief Description of the Drawings

[0020] Figure 1 is the perspective view in the embodiment of the present application;

[0021] Figure 2 is the top view in the embodiment of the present application;

[0022] Figure 3 is the partial cross-sectional view in the embodiment of the present application;

[0023] Figure 4 is the schematic diagram of the hinge arm split in the embodiment of the present application;

[0024] Figure 5 is the first partial split schematic diagram in the embodiment of the present application;

[0025] Figure 6 is the second partial split schematic diagram in the embodiment of the present application;

[0026] Figure 7 is the front view of the pressure rod in the embodiment of the present application;

[0027] Figure 8 is the third partial split schematic diagram in the embodiment of the present application;

[0028] Figure 9 is the fourth partial split schematic diagram in the embodiment of the present application;

[0029] Figure 10 is the partial assembly schematic diagram in the embodiment of the present application.

[0030] Description of reference numerals: 1, pressure bar; 101, assembly part; 1011, groove; 102, first assembly plane; 103, limiting flange; 2, inner rocker arm; 201, assembly hole; 2011, second assembly plane; 3, sound insulation ring; 301, flat part; 4, ball; 501, hinge cup; 502, connecting arm; 503, hinge arm; 504, base; 505, connecting pin; 506, U-shaped pin; 507, transmission assembly; 6, torsion spring. Detailed implementation manners

[0031] This part will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the drawings. The role of the drawings is to supplement the description of the text part of the specification, so as to be able to intuitively and vividly understand each technical feature and the overall technical solution of the present application, but it cannot be understood as a limitation on the protection scope of the present application.

[0032] In the description of the present application, if it involves orientation description, such as "upper", "lower", "front", "rear", "left", "right", etc., the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the present application. When a certain feature is referred to as "set", "fixed", "connected" to another feature, it can be directly set, fixed, connected to another feature, or indirectly set, fixed, connected to another feature.

[0033] In the description of the present application, if it involves "several", its meaning is one or more; if it involves "multiple", its meaning is more than two; if it involves "greater than", "less than", "exceeding", it should be understood as not including the number itself; if it involves "above", "below", "within", it should be understood as including the number itself. If it involves "first", "second", it should be understood as used to distinguish technical features, rather than indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0034] In addition, unless otherwise defined, the technical terms and scientific terms used in the present application are the same as those generally understood by those skilled in the art to which the present application belongs. The terms used in the present application are only for describing specific embodiments, rather than limiting the present application. It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0035] Embodiment: As Figures 1-10 shown, a silent hinge includes a hinge body. The hinge body includes a pressure rod 1, an inner rocker arm 2, and a sound insulation ring 3. The pressure rod 1 is assembled with the inner rocker arm 2, and both ends of the pressure rod 1 are exposed on both side walls of the inner rocker arm 2. The sound insulation ring 3 is sleeved on one end of the pressure rod 1 and is used to abut against the torsion arm of the torsion spring 6. The sound insulation ring 3 is made of a polymer material, and the pressure rod 1 is made of a metal material. The outer diameter of the pressure rod 1 is greater than or equal to the wire diameter of the torsion spring 6. It is worth mentioning that the pressure rod 1 is fixedly connected to the inner rocker arm 2, and the sound insulation ring 3 is fixedly connected to the pressure rod 1. The sound insulation ring 3 supported by the polymer material significantly reduces the frictional noise between the metal pressure rod 1 and the metal torsion spring 6 during the opening and closing process of the hinge, providing a quieter use environment, especially in environments where quietness needs to be maintained, such as hospitals, libraries, etc. Secondly, the pressure rod 1 made of a metal material ensures the necessary rigidity for abutting against the torsion spring 6 and improves the overall strength of the pressure rod 1. The sound insulation ring 3 is sleeved on the pressure rod 1, with simple assembly and improved assembly efficiency. While maintaining the rigidity and durability of the original metal pressure rod 1, the noise is effectively reduced through the polymer material sound insulation ring 3, achieving a balance between performance and cost.

[0036] To improve the rigidity of the pressure rod 1 and avoid the risk of the pressure rod 1 breaking due to force during the opening and closing process of the hinge, the pressure rod 1 is cylindrical, and the outer diameter of the pressure rod 1 is 1.7 - 1.8 times the wire diameter of the torsion spring 6, effectively improving the rigidity of the pressure rod 1. During the opening and closing process of the hinge, the pressure rod 1 can better resist the elastic force of the torsion spring 6, avoiding breakage caused by excessive force, thereby enhancing the stability of the entire hinge structure. Secondly, due to the improvement of the rigidity of the pressure rod 1, the possibility of bending and deforming during its use is reduced, which helps to ensure the extension of the service life of the hinge, reduce the frequency of maintenance and replacement, thereby reducing the noise and vibration caused by deformation, improving the user experience, and maintaining the smoothness of the hinge operation, avoiding jamming caused by the deformation of the pressure rod 1.

[0037] In terms of the specific structure of the press rod 1 and the inner rocker arm 2, the inner rocker arm 2 is provided with an assembly hole 201. The inner diameter of the assembly hole 201 is equal to the outer diameter of the press rod 1. The press rod 1 is provided with an assembly portion 101 for interference fitting with the inner wall of the assembly hole 201. The outer diameter of the assembly portion 101 is 1.02 - 1.05 times the outer diameter of the press rod 1. Preferably, it is 1.03 times. By providing the assembly portion 101, interference fit between the assembly portion 101 and the assembly hole 201 is achieved, thereby realizing the fixed connection between the press rod 1 and the inner rocker arm 2. While reducing the looseness and falling off of the press rod 1 during use, at the same time, the acting force of the torsion spring 6 can be transmitted to the inner rocker arm 2, improving the reliability of the hinge. Secondly, the interference fit between the assembly portion 101 and the assembly hole 201 ensures the precise assembly between the press rod 1 and the inner rocker arm 2, improves the assembly accuracy of the overall structure, reduces the assembly error, and reduces the relative movement between the assembly portion 101 and the assembly hole 201, reducing the wear.

[0038] In order to reduce the difficulty of interference fitting between the assembly portion 101 of the press rod 1 and the assembly hole 201 of the inner rocker arm 2, a plurality of groups of grooves 1011 are provided in the assembly portion 101. The grooves 1011 are recessed from the outside to the inside. When there are multiple groups of grooves 1011, the multiple groups of grooves 1011 are arranged on the assembly portion 101 at equal angular intervals with the axis of the press rod 1 as the center. By providing the grooves 1011 on the assembly portion 101, the contact area during the interference fitting between the assembly portion 101 and the assembly opening is reduced, making the assembly process smoother, thereby reducing the assembly resistance and difficulty. Secondly, by providing the grooves 1011, when the assembly portion 101 and the assembly hole 201 are assembled, the interference fit is made closer, enhancing the stability of the fixed assembly between the press rod 1 and the inner rocker arm 2 and reducing the risk of looseness during use.

[0039] In terms of the specific structure of the assembly portion 101, the axial length of the assembly portion 101 is greater than or equal to the axial length of the axis of the assembly hole 201. When the axial length of the assembly portion 101 is equal to the axial length of the axis of the assembly hole 201, when the press rod 1 and the inner rocker arm 2 are assembled, the assembly portion 101 is located in the assembly hole 201. When the axial length of the assembly portion 101 is greater than the axial length of the axis of the assembly hole 201, when the press rod 1 and the assembly hole 201 are assembled, at least part of the assembly portion 101 is exposed outside the side wall of the inner rocker arm 2. When the sound insulation ring 3 and the press rod 1 are assembled, the sound insulation ring 3 and the assembly portion 101 are subjected to interference fitting, thereby realizing the fixed connection between the sound insulation ring 3 and the press rod 1.

[0040] Refer to Figures 8 to 10In order to increase the contact area between the pressure rod 1 and the torsion spring 6, the torsion spring 6 is a square torsion spring, and the silencer ring 3 is provided with a flat portion 301 abutting against the torsion spring 6. The flat portion 301 is arranged along the axial direction of the silencer ring 3. By providing the flat portion 301, surface contact is made with the square torsion arm of the square spring. By providing the flat portion 301 on the silencer ring 3, surface contact is made with the square torsion arm of the square torsion spring, and the contact area between the silencer ring 3 and the torsion spring 6 is increased, thereby improving the stability and reliability of the pressure rod 1 pressing the torsion arm of the torsion spring 6. Secondly, the surface contact enables the pressure to be evenly distributed on the entire contact surface, reducing local stress concentration, and reducing the risk of wear and fatigue damage of the pressure rod 1 due to stress concentration. Since the contact area between the pressure rod 1 and the torsion spring 6 is increased, the rigidity of the connection is improved, making the hinge more stable when opening and closing, and reducing the noise caused by shaking.

[0041] It is worth mentioning that a square torsion spring refers to a torsion spring whose torsion arm has a square cross-section, while a circular spring refers to a torsion spring whose torsion arm has a circular cross-section.

[0042] In order to ensure that after the pressure rod 1 and the inner rocker arm 2 are assembled, the plane portion 301 of the silencer ring 3 can abut against the torsion arm to achieve a surface contact effect, the pressure rod 1 is provided with a first assembly plane 102, and the first assembly plane 102 is parallel to the plane portion 301. The inner wall of the assembly hole 201 is provided with a second assembly plane 2011, and the second assembly plane 2011 is parallel to the torsion arm of the torsion spring 6, specifically, parallel to the top surface of the torsion arm of the torsion spring 6. Of course, the inner wall of the silencer ring 3 is provided with a third assembly plane parallel to the plane portion 301. During assembly, the third assembly plane of the silencer ring 3 is aligned with the first assembly plane 102 of the pressure rod 1 and then sleeved, thereby completing the assembly of the silencer ring 3 and the pressure rod 1. At this time, the plane portion 301 is parallel to the first assembly plane 102. Then, the first assembly plane 101 of the pressure rod 1 is aligned with the first assembly plane 102. 2 is aligned with the second assembly plane 2011 of the assembly hole 201 of the inner rocker arm 2 for insertion, thereby completing the assembly of the pressure rod 1 and the inner rocker arm 2. At this time, the plane portion 301 is parallel to the top wall of the torsion arm of the torsion spring 6, which improves the assembly accuracy, reduces the assembly error, simplifies the assembly process, and improves the assembly efficiency. Secondly, the design of the assembly plane and the plane portion 301 makes the assembly process fool-proof. The assembler only needs to operate according to the principle of plane alignment to complete the assembly, thereby reducing the risk of assembly errors. Furthermore, through the setting of the third assembly plane and the first assembly plane 102, the silencer ring 3 and the pressure rod 1 are prevented from rotating relative to each other, thereby improving the reliability of the abutment between the silencer ring 3 and the torsion spring 6. Similarly, the setting of the first assembly plane 102 and the second assembly plane 2011 prevents the pressure rod 1 and the inner rocker arm 2 from rotating relative to each other.

[0043] Reference Figure 10, in order to reduce the risk of the silencing ring 3 falling off during use, the pressure rod 1 is provided with a limiting flange 103. The limiting flange 103 is arranged at one end of the pressure rod 1 close to the silencing ring 3. The limiting flange 103 protrudes radially along the end wall of the pressure rod 1. By providing the limiting flange 103, it plays a limiting role on one end of the silencing ring 3, and the other end of the silencing ring 3 abuts against the side wall of the inner rocker arm 2. Therefore, the other end of the inner rocker arm 2 plays a limiting role on the other end of the silencing ring 3. Therefore, the axial movement of the silencing ring 3 on the pressure rod 1 is restricted, and the stability of the silencing ring 3 assembled on the pressure rod 1 is improved.

[0044] Refer to Figures 8 to 10 , in order to reduce the noise caused by the contact between the end wall of the pressure rod 1 and the inner side wall of the hinge arm 503 during the opening and closing of the hinge and the resulting friction, this embodiment further includes a ball 4. The end wall of the pressure rod 1 is provided with a ball groove for assembling the ball 4. When the ball 4 is rollingly assembled in the ball groove, part of the ball 4 is exposed outside the end wall of the pressure rod 1. Preferably, ball grooves are provided at both ends of the pressure rod 1 and balls 4 are installed at both ends. By contacting the inner side wall of the hinge arm 503 with the ball 4, rolling assembly is achieved, and the smoothness of the movement of the pressure rod 1 during the opening and closing of the hinge is improved. The ball 4 is rollingly assembled in the ball groove, reducing the direct contact between the end wall of the pressure rod 1 and the inner side wall of the hinge arm 503, thereby reducing the noise generated by friction, providing a quieter hinge opening and closing action. Secondly, the rolling assembly of the ball 4 improves the smoothness of the movement of the pressure rod 1, making the hinge more stable during the opening and closing process, reducing jamming and blocking sensations.

[0045] In terms of the polymer material used to make the silencing ring 3, the silencing ring 3 is made of polytetrafluoroethylene. Polytetrafluoroethylene is a very wear-resistant polymer material with an extremely low coefficient of friction, which is one of the lowest among known solid materials. It effectively reduces the frictional resistance between the silencing ring 3 and the torsion arm of the torsion spring 6, reduces wear and noise. Secondly, the silencing ring 3 made of polytetrafluoroethylene has its own lubricity, which can improve the smoothness of the relative movement between the pressure rod 1 and the torsion spring 6 without additional lubricant, reduce wear, reduce vibration and noise during the relative movement process, improve the smoothness of the hinge opening and closing, contribute to improving the silent performance of the hinge opening and closing, and enhance the user experience.

[0046] Among them, the hinge body further includes a hinge cup 501, a connecting arm 502, a hinge arm 503, a base 504, a connecting pin 505, a U-shaped pin 506, a transmission assembly 507, and a damper. The rotating shaft is rotatably assembled with the middle part of the inner swing arm 2 and is used to assemble the inner swing arm 2 in the hinge arm 503. One end of the connecting arm 502 is hinged to the hinge cup 501, one end of the inner swing arm 2 is hinged to the hinge cup 501, and the U-shaped pin 506 is used to insert and connect one end of the connecting arm 502 and one end of the inner swing arm 2. The other end of the connecting arm 502 is hinged to one end of the hinge arm 503. The base 504 is assembled at the other end of the hinge arm 503, and the damper is assembled in the base 504. Both ends of the transmission assembly 507 are connected to the inner swing arm 2 and the push rod of the damper, and the transmission assembly 507 is used to transmit the hydraulic buffering force of the damper. The connecting pin 505 passes through the inner ring of the torsion spring 6 and is used to assemble the torsion spring 6 with the hinge arm 503. The first torsion arm of the torsion spring 6 abuts against the sound-absorbing ring 3, and the second torsion arm of the torsion spring 6 is connected to the inner top wall of the hinge arm 503.

[0047] This embodiment provides a specific implementation manner. The wire diameter of the torsion spring 6 is 2 mm, the outer diameter of the pressure rod 1 is 3.4 mm, the axial length of the pressure rod 1 is 14.6 mm, the axial length of the assembly part 101 is 6.5 mm, and the axial length of the assembly hole 201 is 6.5 mm.

[0048] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A silent hinge, comprising a hinge body, characterized in that: The hinge body includes a pressure rod, an inner rocker arm, and a silencer ring. The pressure rod is assembled with the inner rocker arm, and both ends of the pressure rod are exposed on the two side walls of the inner rocker arm. The silencer ring is sleeved on one end of the pressure rod and is used to abut against the torsion arm of the torsion spring. The silencer ring is made of a polymer material, and the pressure rod is made of a metal material. The outer diameter of the pressure rod is greater than or equal to the wire diameter of the torsion spring.

2. A silent hinge according to claim 1, characterized in that: The pressure rod is cylindrical, and the outer diameter of the pressure rod is 1.7 to 1.8 times the wire diameter of the torsion spring.

3. The silent hinge according to claim 1, characterized in that: The inner rocker arm is provided with an assembly hole, the inner diameter of which is equal to the outer diameter of the pressure rod, and the pressure rod is provided with an assembly portion for interference fitting with the inner wall of the assembly hole, and the outer diameter of the assembly portion is 1.02 to 1.05 times the outer diameter of the pressure rod.

4. The silent hinge according to claim 3, characterized in that: The assembly part is provided with a plurality of groups of grooves, which are recessed from the outside to the inside. When there are a plurality of groups of grooves, the plurality of groups of grooves are arranged on the assembly part at equal angles with the axis of the pressure rod as the center.

5. A silent hinge according to claim 3 or 4, characterized in that: The axial length of the assembly portion is greater than or equal to the axial length of the assembly hole.

6. The silent hinge according to claim 3, characterized in that: The torsion spring is a square torsion spring, and the silencer ring is provided with a plane portion abutting against the torsion spring, and the plane portion is arranged along the axial direction of the silencer ring.

7. The silent hinge according to claim 6, characterized in that: The pressure rod is provided with a first assembly plane, which is arranged parallel to the plane portion; the inner wall of the assembly hole is provided with a second assembly plane, which is arranged parallel to the torsion arm of the torsion spring.

8. The silent hinge according to claim 1, characterized in that: The pressure rod is provided with a limiting flange, and the limiting flange is arranged at one end of the pressure rod close to the silencer ring. The limiting flange is arranged along the radial protrusion of the pressure rod from the end wall of the pressure rod.

9. The silent hinge according to claim 8, characterized in that: It also includes balls, and the end wall of the pressure rod is provided with a ball groove for assembling the balls. When the balls are rolled and assembled in the ball groove, part of the balls are exposed from the end wall of the pressure rod.

10. The silent hinge according to claim 1, characterized in that: The silencer ring is made of polytetrafluoroethylene.

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