Hinge mechanism with variable damping

Abstract

The invention discloses a hinge mechanism with variable damping, which relates to the technical field of spaceflight and comprises a fixed blade, a movable blade, a hinge shaft, a bushing, a gasket, a connecting pin, a first cam part, a second cam part, a belleville spring, a third cam part, a fourth cam part and a limiting stop block. The fixed hinge is fixedly connected with the cabin body, the movable hinge is fixedly connected with the cabin door, and the hinge shaft is fixedly connected with the movable hinge; the first cam piece and the fourth cam piece are installed on the fixed hinge piece, and the second cam piece and the third cam piece are connected with the hinge shaft through matching of the square shaft and the square groove. When the cabin door is in a closed state, the hinge mechanism has no damping torque, and the situation that the cooperation of the cabin door and the cabin body is affected due to the springback effect generated by the damping torque at the moment when the cabin door is closed by an astronaut is avoided; in the opening process of the cabin door, the hinge mechanism generates damping torque which is gradually increased to a stable value, and the damping torque can prevent the cabin door from drifting in the space weightless environment.

Description

Technical Field

[0001] The invention relates to the field of aerospace technology, and in particular to a hinge mechanism with variable damping. Background Art

[0002] With the development of aerospace engineering, especially manned space flight and space station technology, more and more equipment on some spacecraft, such as large space telescopes, needs to be repaired and replaced by astronauts in order to extend the service life of the spacecraft and improve equipment performance. This requires astronauts to open and close the maintenance doors of the corresponding equipment. For the convenience of astronauts' operation, the maintenance doors are connected to the cabin through a hinge mechanism after opening.

[0003] Although the hatch hinge mechanism on traditional manned spacecraft has good load-bearing capacity and high reliability, the mechanism system is too complex, heavy, large in size, and time-consuming and labor-intensive to operate. Therefore, it is only suitable for manned spacecraft, not unmanned spacecraft. The hinge mechanism used in conventional ground maintenance covers usually adopts a simple hinge structure without built-in damping torque. In the weightless environment of space, the hatch is prone to drift, which interferes with the astronauts' on-orbit maintenance operations and even poses a safety risk. The hinge mechanism with damping torque used in some ground equipment usually adopts a hydraulic damping device or simply squeezes the parts to produce constant damping. It is not suitable for long-term use in a vacuum environment, nor is it suitable for astronauts to operate in the weightless environment of space.

[0004] Based on the above technical problems, technicians in this field urgently need to develop a hinge mechanism with variable damping that can be used to connect the maintenance hatch and the cabin of a spacecraft to facilitate astronauts' on-orbit maintenance operations. Summary of the invention

[0005] The purpose of the present invention is to provide a hinge mechanism with variable damping that can be applied to the connection between a maintenance hatch and a cabin of a spacecraft to facilitate on-orbit maintenance operations by astronauts.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A hinge mechanism with variable damping of the present invention comprises:

[0008] A fixed sheet fixedly connected to the cabin; and

[0009] A movable leaf fixedly connected to the hatch;

[0010] A hinge shaft connected to the movable leaf piece through two connecting pins, and both ends of the hinge shaft are connected to the fixed leaf piece;

[0011] a bushing mounted on one end of the fixed leaf;

[0012] Two washers are arranged at the joints of the fixed leaf and the movable leaf;

[0013] A cam assembly installed on the fixed leaf away from the bushing, the cam assembly comprising a first cam member, a second cam member, a third cam member and a fourth cam member from bottom to top, the first cam member and the fourth cam member are respectively connected to the fixed leaf, two ends of the second cam member are respectively inserted into the third cam member and the hinge shaft, the first cam member and the fourth cam member form a fixed cam, and the second cam member and the third cam member form a movable cam;

[0014] The hinge mechanism also includes:

[0015] A plurality of butterfly springs are arranged in a straight line combination between the second cam member and the third cam member;

[0016] A limit stopper is fixedly connected to the fixed sheet.

[0017] Furthermore, the fixed sheet is provided with a first lug and a second lug at two ends respectively cooperating with the movable sheet, the first lug is provided with a hexagonal groove, and the first cam member is mounted on the first lug through the hexagonal groove;

[0018] The first lug extends outwardly from the cavity structure, and a first connecting lug is provided at the end of the cavity structure;

[0019] The fixed sheet is provided with a plurality of fixed sheet connectors for connecting the fixed sheet and the cabin.

[0020] Furthermore, the movable sheet is configured as a movable sheet cylindrical section at the portion cooperating with the fixed sheet, and the two washers are respectively arranged at the junction of the two ends of the movable sheet cylindrical section and the fixed sheet;

[0021] The movable leaf cylindrical section is longitudinally provided with a second through hole penetrating therethrough, which cooperates with the hinge shaft;

[0022] The movable leaf cylindrical section is transversely provided with two first pin holes for the connecting pin to penetrate;

[0023] The movable sheet is provided with a plurality of movable sheet connectors for connecting the movable sheet and the cabin door.

[0024] Furthermore, one end of the hinge shaft is longitudinally provided with a first square groove, and one end of the second cam member is inserted into the first square groove;

[0025] Two second pin holes are transversely arranged on the hinge shaft body, and the connecting pin passes through the first pin hole and the second pin hole respectively to form an interference fit, so that the hinge shaft is fixedly connected to the movable leaf piece.

[0026] Furthermore, a third through hole is provided in the middle of the bushing for the hinge shaft to pass through;

[0027] A plurality of bushing connectors are provided at the outer edge of the bushing for connecting the bushing and the fixed sheet.

[0028] Furthermore, the first cam member is provided with a hexagonal shaft, and the first cam member is installed on the fixed leaf piece through the cooperation between the hexagonal shaft and the hexagonal groove;

[0029] The upper end surface of the first cam member forms a first cam surface, and a first through hole is provided in the middle of the first cam member for the hinge shaft to penetrate.

[0030] Further, a first square shaft and a second square shaft are respectively provided at both ends of the second cam member, and the first square shaft is inserted into the first square groove so that the second cam member is connected to the hinge shaft;

[0031] An annular boss is provided in the middle of the second cam member, the lower surface of the annular boss forms a second cam surface, and the upper surface of the annular boss is a plane, and the bottom of the disc spring is limited by the upper surface of the annular boss.

[0032] Further, the third cam member includes a cam top plate and a cam cylinder, the upper surface of the cam top plate forms a third cam surface, the lower surface of the cam top plate is a plane, the top of the disc spring is limited by the lower surface of the cam top plate, and the cam cylinder penetrates into the inner hole of the disc spring;

[0033] A second square groove is provided in the middle of the third cam member, and the second square shaft is inserted into the second square groove, so that the third cam member is connected to the second cam member.

[0034] Furthermore, the top surface of the inner cavity of the fourth cam member forms a fourth cam surface, and the end of the fourth cam member is provided with a second connecting ear;

[0035] The second connecting ear is provided with a plurality of top cover connecting members for connecting the second connecting ear with the first connecting ear, so that the fourth cam member and the cavity structure wrap the first cam member, the second cam member, the disc spring and the third cam member which are connected in sequence.

[0036] Furthermore, the limit stopper is provided with a plurality of limit stopper connecting members for connecting the limit stopper and the fixed page.

[0037] Preferably, the fixed page, the movable page and the limit stopper are all provided with reinforcing ribs.

[0038] In the above technical solution, the hinge mechanism with variable damping provided by the present invention has the following beneficial effects:

[0039] The present invention provides a hinge mechanism with variable damping. When the cabin door is in a closed state, there is no extrusion force and an initial gap on the matching surfaces of the cams, and the hinge mechanism has no damping torque, so as to avoid the rebound effect caused by the damping torque at the moment when the astronaut closes the cabin door and affecting the matching between the cabin door and the cabin body. The initial gap enables the hinge mechanism to adapt to certain assembly deviations and avoid assembly stress. During the process of opening the cabin door, two adjacent cam parts produce circumferential and axial relative motion, the disc spring is squeezed, thereby generating friction resistance on the cam matching surface, and the hinge mechanism generates a damping torque and gradually increases to a stable value. The damping torque can prevent the cabin door from drifting in the weightlessness environment of space. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0041] Figure 1 A schematic diagram of the assembly of a hinge mechanism with variable damping provided by an embodiment of the present invention;

[0042] Figure 2 A schematic diagram of disassembly of parts of a hinge mechanism with variable damping provided by an embodiment of the present invention;

[0043] Figure 3 A schematic diagram of a hinge mechanism with variable damping provided by an embodiment of the present invention in a door closed state;

[0044] Figure 4 A schematic diagram of a cam mating surface of a hinge mechanism with variable damping provided by an embodiment of the present invention when the door is closed;

[0045] Figure 5 A schematic diagram of a cam mating surface when a hinge mechanism with variable damping generates gradually increasing damping provided by an embodiment of the present invention;

[0046] Figure 6 A schematic diagram of a cam mating surface when a hinge mechanism with variable damping produces stable and constant damping provided by an embodiment of the present invention;

[0047] Figure 7 A schematic diagram of the position limitation of a hinge mechanism with variable damping when a door is opened to a maximum angle provided in an embodiment of the present invention.

[0048] Description of reference numerals:

[0049] Label name Label name Hinge mechanism 100 First through hole 1072 Fixed Page 101 First cam surface 1073 First lug 1011 Second cam member 108 Second lug 1012 The first square axis 1081 Hexagonal groove 1013 The second square axis 1082 Cavity structure 1014 Annular boss 1083 First connection ear 1015 Second cam surface 1084 Fixed leaf connector 1016 Disc spring 109 Activity Pages 102 The third cam 110 Active leaf cylindrical segment 1021 Cam top plate 1101 Second through hole 1022 Cam cylinder 1102 First pin hole 1023 Second square slot 1103 Active leaf connector 1024 The third cam surface 1104 Hinge axis 103 Fourth cam member 111 First square slot 1031 Fourth cam surface 1111 Second pin hole 1032 Second connecting ear 1112 bushing 104 Top cover connector 1113 The third through hole 1041 Limit stop 112 Bushing connector 1042 Limit stop connector 1121 washer 105 Cabin 200 Connecting pin 106 Hatch 300 First cam element 107 Fixed cam 10 Hexagonal axis 1071 Activity Cam 11 DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0051] See also Figure 1 to Figure 7 As shown;

[0052] A hinge mechanism with variable damping of the present invention comprises:

[0053] A fixed sheet 101 fixedly connected to the cabin 200; and

[0054] A movable leaf 102 fixedly connected to the hatch 300;

[0055] A hinge shaft 103 connected to the movable leaf 102 via two connecting pins 106, wherein both ends of the hinge shaft 103 are connected to the fixed leaf 101;

[0056] A bushing 104 installed at one end of the fixed sheet 101;

[0057] Two washers 105 provided at the joints of the fixed leaf 101 and the movable leaf 102;

[0058] A cam assembly installed on the fixed sheet 101 at one end away from the bushing 104, the cam assembly comprises, from bottom to top, a first cam member 107, a second cam member 108, a third cam member 110 and a fourth cam member 111, the first cam member 107 and the fourth cam member 111 are respectively connected to the fixed sheet 101, two ends of the second cam member 108 are respectively inserted into the third cam member 110 and the hinge shaft 103, the first cam member 107 and the fourth cam member 111 form a fixed cam 10, and the second cam member 108 and the third cam member 110 form a movable cam 11;

[0059] The hinge mechanism also includes:

[0060] A plurality of butterfly springs 109 are arranged in a straight line arrangement between the second cam member 108 and the third cam member 110;

[0061] A limit stopper 112 is fixedly connected to the fixed sheet 101 .

[0062] As a further introduction to this embodiment, the fixed leaf 101 is provided with a first lug 1011 and a second lug 1012 at two ends respectively cooperating with the movable leaf 102, the first lug 1011 is provided with a hexagonal groove 1013, and the first cam member 107 is mounted on the first lug 1011 through the hexagonal groove 1013;

[0063] The first lug 1011 extends outwardly to form a cavity structure 1014, and a first connecting lug 1015 is disposed at the end of the cavity structure 1014;

[0064] The fixed sheet 101 is provided with a plurality of fixed sheet connectors 1016 for connecting the fixed sheet 101 and the cabin 200 .

[0065] As a further introduction to this embodiment, the movable leaf 102 is configured as a movable leaf cylindrical section 1021 at the portion that matches the fixed leaf 101, and the two washers 105 are respectively disposed between the two ends of the movable leaf cylindrical section 1021 and the first lug 1011 and the second lug 1012;

[0066] The movable leaf cylindrical section 1021 is longitudinally provided with a second through hole 1022 penetrating therethrough, which cooperates with the hinge shaft 103;

[0067] The movable leaf cylindrical section 1021 is laterally provided with two first pin holes 1023 for the connecting pin 106 to penetrate;

[0068] The movable sheet 102 is provided with a plurality of movable sheet connectors 1024 for connecting the movable sheet 102 and the cabin door 300 .

[0069] As a further introduction to this embodiment, a first square groove 1031 is longitudinally provided at one end of the hinge shaft 103, and one end of the second cam member 108 is inserted into the first square groove 1031;

[0070] The hinge shaft 103 is provided with two second pin holes 1032 in a transverse direction;

[0071] As a preferred technical solution of this embodiment, the two connecting pins 106 are cylindrical pins or tapered pins, the two first pin holes 1023 and the two second pin holes 1032 are coaxial respectively, and the connecting pin 106 is connected with the first pin hole 1023 and the second pin hole 1032 by interference fit so that the hinge shaft 103 is fixedly connected with the movable leaf 102.

[0072] As a further introduction to this embodiment, a third through hole 1041 is provided in the middle of the bushing 104 for the hinge shaft 103 to penetrate;

[0073] A plurality of bushing connectors 1042 are disposed at the outer edge of the bushing 104 for connecting the bushing 104 and the fixed sheet 101 .

[0074] As a further introduction to this embodiment, the first cam member 107 is provided with a hexagonal shaft 1071, and the first cam member 107 is installed on the fixed leaf 101 through the cooperation between the hexagonal shaft 1071 and the hexagonal groove 1013;

[0075] A first cam surface 1073 is formed on the upper end surface of the first cam member 107 , and a first through hole 1072 is defined in the middle of the first cam member 107 for the hinge shaft 103 to penetrate therethrough.

[0076] As a further introduction to this embodiment, the second cam member 108 is provided with a first square shaft 1081 and a second square shaft 1082 at both ends thereof, and the first square shaft 1081 is inserted into the first square groove 1031, so that the second cam member 108 is connected to the hinge shaft 103;

[0077] An annular boss 1083 is provided in the middle of the second cam member 108 , the lower surface of the annular boss 1083 forms a second cam surface 1084 , and the upper surface of the annular boss 1083 is a plane, and the bottom of the disc spring 109 is limited by the upper surface of the annular boss 1083 .

[0078] As a further introduction to this embodiment, the third cam member 110 includes a cam top plate 1101 and a cam cylinder 1102. The upper surface of the cam top plate 1101 forms a third cam surface 1104. The lower surface of the cam top plate 1101 is a plane. The top of the disc spring 109 is limited by the lower surface of the cam top plate 1101, and the cam cylinder 1102 penetrates into the inner hole of the disc spring 109.

[0079] The third cam member 110 is provided with a second square groove 1103 , and the second square shaft 1082 is inserted into the second square groove 1103 , so that the third cam member 110 is connected to the second cam member 108 .

[0080] As a further introduction to this embodiment, the top surface of the inner cavity of the fourth cam member 111 is a fourth cam surface 1111, and a second connecting ear 1112 is provided at the end of the fourth cam member 111;

[0081] The second connecting ear 1112 is provided with a plurality of top cover connecting members 1113 for connecting the second connecting ear 1112 with the first connecting ear 1015, so that the fourth cam member 111 and the cavity structure 1014 wrap the first cam member 107, the second cam member 108, the disc spring 109 and the third cam member 110 which are connected in sequence.

[0082] As a further introduction to this embodiment, a plurality of limit block connectors 1121 are provided on the limit block 112 for connecting the limit block 112 and the fixed sheet 101 .

[0083] As a preferred technical solution of this embodiment, the fixed leaf connector 1016, the movable leaf connector 1024, the bushing connector 1042, the top cover connector 1113 and the limit stopper connector 1121 can be screws, rivets, welded bodies, etc., and the number thereof is preferably 4. In the drawings of this embodiment, the fixed leaf connector 1016, the movable leaf connector 1024 and the top cover connector 1113 are all hexagon socket head screws, the bushing connector 1042 is a countersunk screw, and the limit stopper connector 1121 is a matching piece of a countersunk screw and a hexagonal nut.

[0084] As a preferred technical solution of this embodiment, the fixed leaf 101, the movable leaf 102, and the limit stopper 112 are all provided with reinforcing ribs to improve the structural rigidity.

[0085] It should be noted that the first square shaft 1081 and the first square groove 1031 are clearance-fitted, and the second square shaft 1082 and the second square groove 1103 are clearance-fitted, so that the two pieces of the square shaft and the square groove can produce axial relative movement.

[0086] Furthermore, the first cam surface 1073 and the second cam surface 1084 are in surface-matching, and the third cam surface 1104 and the fourth cam surface 1111 are in surface-matching. When the hatch 300 is opened, the movable leaf 102 rotates counterclockwise around the hinge shaft 103 and drives the hinge shaft 103 to rotate. The hinge shaft 103 drives the second cam member 108 to rotate through the cooperation between the first square groove 1031 and the first square shaft 1081, and drives the third cam member 110 to rotate through the cooperation between the second square shaft 1082 and the second square groove 1103. The first cam member 107 remains fixed due to the cooperation between the hexagonal shaft 1071 and the hexagonal groove 1013, and the fourth cam member 111 also remains fixed due to the connection with the top cover connecting member 1113. Therefore, the first cam member 107 and the fourth cam member 111 form a fixed cam 10, and the second cam member 108 and the third cam member 110 form a movable cam 11. The schematic diagram of the outer contour surface of two adjacent cam members is shown in FIG. Figures 4 to 6 As shown, the cam mating surface has features such as initial gap a, cam climbing section b, plane section c, and vertical step d. Figure 4 The "e" in the middle represents the limit position of the limit stop.

[0087] In a specific embodiment of the present invention, when the hatch 300 is in a closed state, the disc spring 109 is in a free state, there is no extrusion pressure on the cam mating surface and there is an initial gap, and the hinge mechanism 100 has no damping torque within a certain angle range, so as to avoid the astronaut from generating a rebound effect due to the damping torque at the moment of closing the hatch 300 and affecting the mating between the hatch 300 and the cabin body 200, and the initial gap enables the hinge mechanism 100 to adapt to a certain assembly deviation and avoid assembly stress; during the opening process of the hatch 300, the climbing sections of the upper and lower cam members begin to contact and cooperate, and at this time the movable cam 11 generates an axial relative movement away from the fixed cam 10, that is, the second cam member 108 moves upward and the third cam member 110 moves upward. During the downward movement, the disc spring 109 between the second cam member 108 and the third cam member 110 is continuously squeezed to generate a gradually increasing elastic force, and the two pairs of cam mating surfaces generate a gradually increasing frictional resistance due to the squeezing force and relative movement, which is reflected in the hinge mechanism 100 as a gradually increasing damping torque; then the planar sections of the upper and lower cam members begin to contact and cooperate, the compression amount of the disc spring 109 and the frictional resistance of the cam mating surfaces remain constant, and a stable and unchanged damping torque is generated in the hinge mechanism 100, which can prevent the cabin door 300 from drifting in the weightless environment of space; finally, the movable leaf 103 contacts the limit stop block 112, the hinge mechanism 100 cannot continue to rotate, and the cabin door 300 opens to the maximum angle.

[0088] In the above embodiment, two pairs of cam mating surfaces are used. In other embodiments, only one pair of cam mating surfaces may be used, and the other pair of cam mating surfaces may be changed to plane mating. During the opening process of the hatch 300, one of the movable cams 11 moves relative to one of the fixed cams 10 to squeeze the disc spring 109, and friction resistance is generated between the cam mating surfaces and between the plane mating surfaces. Similarly, the hinge mechanism 100 can have the characteristic of regularly changing damping.

[0089] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A hinge mechanism with variable damping, characterized in that: The hinge mechanism comprises: A fixed sheet (101) fixedly connected to the cabin (200); and A movable leaf (102) fixedly connected to the cabin door (300); A hinge shaft (103) connected to the movable leaf (102) via two connecting pins (106), wherein both ends of the hinge shaft (103) are connected to the fixed leaf (101); A bushing (104) mounted on one end of the fixed sheet (101); Two washers (105) provided at the joints of the fixed leaf (101) and the movable leaf (102); A cam assembly installed on the fixed sheet (101) at one end away from the bushing (104), the cam assembly comprising, from bottom to top, a first cam member (107), a second cam member (108), a third cam member (110) and a fourth cam member (111), the first cam member (107) and the fourth cam member (111) being connected to the fixed sheet (101) respectively, two ends of the second cam member (108) being inserted into the third cam member (110) and the hinge shaft (103) respectively, the first cam member (107) and the fourth cam member (111) forming a fixed cam (10), and the second cam member (108) and the third cam member (110) forming a movable cam (11); The hinge mechanism also includes: A plurality of butterfly springs (109) are arranged in a straight line combination between the second cam member (108) and the third cam member (110); A limit stopper (112) is fixedly connected to the fixed sheet (101).

2. A hinge mechanism with variable damping according to claim 1, characterized in that: The fixed sheet (101) is provided with a first lug (1011) and a second lug (1012) at two ends respectively matched with the movable sheet (102); the first lug (1011) is provided with a hexagonal groove (1013), and the first cam member (107) is installed on the first lug (1011) through the hexagonal groove (1013); The first lug (1011) extends outwardly to form a cavity structure (1014), and a first connecting lug (1015) is provided at an end of the cavity structure (1014); The fixed sheet (101) is provided with a plurality of fixed sheet connectors (1016) for connecting the fixed sheet (101) and the cabin (200).

3. The hinge mechanism with variable damping according to claim 1, characterized in that: The movable sheet (102) is configured as a movable sheet cylindrical section (1021) at the portion matching with the fixed sheet (101), and the two washers (105) are respectively arranged at the junction of the two ends of the movable sheet cylindrical section (1021) and the fixed sheet (101); The movable leaf cylindrical section (1021) is longitudinally provided with a second through hole (1022) penetrating therethrough, which cooperates with the hinge shaft (103); The movable leaf cylindrical section (1021) is laterally provided with two first pin holes (1023) for the connecting pin (106) to penetrate; The movable sheet (102) is provided with a plurality of movable sheet connectors (1024) for connecting the movable sheet (102) and the cabin door (300).

4. A hinge mechanism with variable damping according to claim 3, characterized in that: A first square groove (1031) is longitudinally provided at one end of the hinge shaft (103), and one end of the second cam member (108) is inserted into the first square groove (1031); Two second pin holes (1032) are transversely arranged on the hinge shaft (103) shaft body, and the connecting pin (106) passes through the first pin hole (1023) and the second pin hole (1032) respectively to form an interference fit, so that the hinge shaft (103) is fixedly connected to the movable leaf (102).

5. The hinge mechanism with variable damping according to claim 2, characterized in that: A third through hole (1041) is provided in the middle of the bushing (104) for the hinge shaft (103) to pass through; Furthermore, a plurality of bushing connectors (1042) are provided at the outer edge of the bushing (104) for connecting the bushing (104) and the fixed sheet (101).

6. The hinge mechanism with variable damping according to claim 2, characterized in that: The first cam member (107) is provided with a hexagonal shaft (1071), and the first cam member (107) is installed on the fixed leaf (101) through the cooperation between the hexagonal shaft (1071) and the hexagonal groove (1013); The upper end surface of the first cam member (107) forms a first cam surface (1073), and a first through hole (1072) is provided in the middle of the first cam member (107) for the hinge shaft (103) to penetrate.

7. The hinge mechanism with variable damping according to claim 4, characterized in that: A first square shaft (1081) and a second square shaft (1082) are respectively provided at two ends of the second cam member (108); the first square shaft (1081) is inserted into the first square groove (1031) so that the second cam member (108) is connected to the hinge shaft (103); An annular boss (1083) is provided in the middle position of the second cam member (108), the lower surface of the annular boss (1083) forms a second cam surface (1084), and the upper surface of the annular boss (1083) is a plane, and the bottom of the disc spring (109) is limited by the upper surface of the annular boss (1083).

8. The hinge mechanism with variable damping according to claim 7, characterized in that: The third cam member (110) comprises a cam top plate (1101) and a cam cylinder (1102); the upper surface of the cam top plate (1101) forms a third cam surface (1104); the lower surface of the cam top plate (1101) is a plane; the top of the disc spring (109) is limited by the lower surface of the cam top plate (1101), and the cam cylinder (1102) penetrates into the inner hole of the disc spring (109); A second square groove (1103) is provided in the middle of the third cam member (110), and the second square shaft (1082) is inserted into the second square groove (1103) so that the third cam member (110) is connected to the second cam member (108).

9. The hinge mechanism with variable damping according to claim 2, characterized in that: The top surface of the inner cavity of the fourth cam member (111) forms a fourth cam surface (1111), and the end of the fourth cam member (111) is provided with a second connecting ear (1112); The second connecting ear (1112) is provided with a plurality of top cover connecting members (1113) for connecting the second connecting ear (1112) with the first connecting ear (1015), so that the fourth cam member (111) and the cavity structure (1014) wrap the first cam member (107), the second cam member (108), the disc spring (109) and the third cam member (110) which are connected in sequence.

10. The hinge mechanism with variable damping according to claim 1, characterized in that: The limit stopper (112) is provided with a plurality of limit stopper connecting members (1121) for connecting the limit stopper (112) and the fixed sheet (101).

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