One-way torque hinge with adjustable torque force

Abstract

The utility model belongs to the technical field of hinges, and particularly discloses a one-way torque hinge with adjustable torque force, which comprises a left shell, a right shell, a middle shell, a long shaft, a friction plate, a one-way bearing, a sealing ring, a metal side sealing block, a pin and a connection relation of the left shell, the right shell, the middle shell, the long shaft and the pin. Friction force is generated through interference meshing between the metal friction plates and the long shaft, so that torque force is formed, and then the torque force of the hinge is set by changing the number of the friction plates.

Description

Technical Field

[0001] This utility model relates to the field of hinge technology, and in particular to a unidirectional torque hinge with adjustable torque force. Background Technology

[0002] A hinge, also known as a hinge joint, is a mechanical device used to connect two solid objects and allow relative rotation between them. Hinges consist of movable components or are made of foldable materials, and are mainly installed in doors, windows, cabinets, etc. Currently, most hinges on the market require torque to open and close; there is a lack of hinges that require torque to open but not to close, or vice versa. Utility Model Content

[0003] The purpose of this invention is to solve the technical problems existing in the background art. To this end, a unidirectional torque hinge with adjustable torque force is provided.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A torque-adjustable unidirectional torque hinge includes a long shaft, at least one first housing, and at least one second housing;

[0006] N friction plates are interference-fitted onto the long shaft, where N≥1;

[0007] The friction plate is installed in the friction plate mounting cavity of the first housing and rotates as the first housing rotates;

[0008] A one-way bearing is installed between the long shaft and the second housing.

[0009] The following is a further defined technical solution of this utility model: one end of the friction plate is rectangular and the other end is arc-shaped, and the cross-sectional shape of the friction plate mounting cavity is adapted to the shape of the friction plate.

[0010] The following is a further defined technical solution of this utility model: the number of the first outer shell is 1 and it is a middle outer shell. The middle outer shell is installed at the middle position of the long axis by N friction plates.

[0011] The number of the second outer shell is two, and the two second outer shells are a left outer shell and a right outer shell. A left one-way bearing is installed between the left outer shell and the left end of the long shaft, and a right one-way bearing is installed between the right outer shell and the right end of the long shaft.

[0012] The left and right one-way bearings rotate in the same direction.

[0013] The following is a further defined technical solution of this utility model: the left outer shell includes an integrally formed left bearing mounting part and a left connecting part, and a connecting hole is provided on the left connecting part;

[0014] The left bearing mounting part has a stepped mounting cavity, which includes a small inner diameter mounting cavity and a large inner diameter mounting cavity arranged in sequence. Multiple retaining ribs are evenly distributed on the inner wall of the large inner diameter mounting cavity.

[0015] The left one-way bearing is installed in the large inner diameter mounting cavity. The outer diameter of the left one-way bearing is larger than the inner diameter of the small inner diameter mounting cavity and smaller than or equal to the inner diameter of the large inner diameter mounting cavity. Multiple slots are formed on the outer wall of the left one-way bearing along its axial direction. The slots cooperate with the retaining ribs.

[0016] The long shaft is tightly fitted to the inner wall of the left one-way bearing, and the long shaft passes through the left one-way bearing and extends into the small inner diameter mounting cavity.

[0017] The following is a further defined technical solution of this utility model: the right outer shell includes an integrally formed right bearing mounting part and a right connecting part, and a connecting hole is provided on the right connecting part;

[0018] The right bearing mounting part has a stepped mounting cavity, which includes a small inner diameter mounting cavity and a large inner diameter mounting cavity arranged in sequence. The inner wall of the large inner diameter mounting cavity is provided with multiple retaining ribs, and the length of the retaining ribs is less than the axial length of the large inner diameter mounting cavity.

[0019] The right one-way bearing is installed in the large inner diameter mounting cavity. The outer diameter of the right one-way bearing is larger than the inner diameter of the small inner diameter mounting cavity and smaller than or equal to the inner diameter of the large inner diameter mounting cavity. Multiple slots are formed on the outer wall of the right one-way bearing along its axial direction. The slots cooperate with the retaining ribs.

[0020] The long shaft is tightly fitted to the inner wall of the right one-way bearing, and the long shaft passes through the right one-way bearing and extends into the small inner diameter mounting cavity.

[0021] The following is a further defined technical solution of this utility model: the inner shell includes an integrally formed inner mounting part and an inner connecting part. The inner connecting part has a connecting hole. The inner mounting part has a side sealing block mounting cavity and a friction plate mounting cavity. The side sealing block mounting cavities are symmetrically arranged on both sides of the friction plate mounting cavity. N friction plates are axially mounted in the friction plate mounting cavity along the long axis.

[0022] The following is a further technical solution of this utility model: a sealing ring and a metal side sealing block are installed between the middle mounting part and the left bearing mounting part of the left outer shell, and between the middle mounting part and the right bearing mounting part of the right outer shell.

[0023] The metal side sealing block is installed in the side sealing block mounting cavity, with one side of the metal side sealing block abutting against the side opening of the friction plate mounting cavity and the other side abutting against the sealing ring.

[0024] The left or right bearing mounting part abuts against its corresponding sealing ring.

[0025] The following is a further defined technical solution of this utility model: the inner diameter of the large inner diameter mounting cavity of the left bearing mounting part or the inner diameter of the large inner diameter mounting cavity of the right bearing mounting part is adapted to the outer diameter of its corresponding sealing ring.

[0026] The length of the retaining rib on the inner wall of the large inner diameter mounting cavity is less than the axial length of the large inner diameter mounting cavity, and the opening at the end of the large inner diameter mounting cavity away from the sealing ring is aligned with the end of the retaining rib.

[0027] The sealing ring extends into the large inner diameter mounting cavity, with one side abutting against the end of the retaining rib and the other side abutting against the metal side sealing block.

[0028] The following is a further defined technical solution of this utility model: the metal side sealing block includes a first abutting part, a second abutting part and a third abutting part connected in sequence, and the cross-section of the metal side sealing block is set to T-shaped;

[0029] The cross-section of the first abutting part is rectangular at one end and arc-shaped at the other end;

[0030] The cross-section of the second abutment part is rectangular at one end and arc-shaped at the other end;

[0031] The cross-sectional shape of the third abutment portion is circular;

[0032] The first and second abutting parts of the metal side sealing block are installed in the side sealing block mounting cavity, and the outer wall shapes of the first and second abutting parts of the metal side sealing block are adapted to the inner wall shape of the side sealing block mounting cavity.

[0033] A sealing contact surface is provided at the connection between the side sealing block mounting cavity and the friction plate mounting cavity, and the first contact part abuts against the sealing contact surface;

[0034] The sealing ring is fitted on the outside of the third abutment portion;

[0035] The left or right one-way bearing abuts against the third abutment part.

[0036] The following is a further technical solution of this utility model: a pin is connected between the left connecting part of the left outer shell and the right connecting part of the right outer shell; a pin groove is provided on the back of the right connecting part; a stepped pin through groove is provided on the left connecting part; the cross-section of the pin is T-shaped; one end of the pin passes through the stepped pin through groove and extends into the pin groove.

[0037] Compared with the prior art, the present invention has the following technical effects:

[0038] This invention utilizes the interference fit between a metal friction plate and a long shaft to generate friction, thereby forming a torque force. The torque force of the hinge can be set by changing the number of friction plates.

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the structure of this utility model;

[0042] Figure 2 This is an exploded structural diagram of the present invention;

[0043] Figure 3 This is a partial structural schematic diagram of the present invention;

[0044] Figure 4 This is a partial structural diagram of the present invention after reducing the number of friction plates;

[0045] Figure 5 This is a schematic diagram of the structure of the left outer shell of this utility model, wherein, Figure 5 (a) is a structural schematic diagram of the left outer shell from one perspective. Figure 5 (b) is a structural schematic diagram of the left outer shell from another perspective;

[0046] Figure 6 This is a schematic diagram of the right outer shell of this utility model, wherein, Figure 6 (a) is a structural schematic diagram of the right outer shell from one perspective. Figure 6 (b) is a structural schematic diagram of the right outer shell from another perspective;

[0047] Figure 7 This is a schematic diagram of the outer shell structure in this utility model, wherein, Figure 7 (a) is a structural schematic diagram of the inner shell from one perspective. Figure 7 (b) is a structural schematic diagram of the inner shell from another perspective;

[0048] Figure 8 This is a schematic diagram of the structure of the left one-way bearing in this utility model;

[0049] Figure 9 This is a schematic diagram of the structure of the metal side sealing block in this utility model, wherein, Figure 9 (a) is a structural schematic diagram of the metal side sealing block from one perspective. Figure 9 (b) is a structural schematic diagram of the metal side sealing block from another perspective;

[0050] Figure 10 This is a schematic diagram of the friction plate structure in this utility model;

[0051] Figure 11 This is a schematic diagram of the back structure of this utility model.

[0052] Reference numerals: 1. Left outer shell; 101. Left bearing mounting part; 102. Left connecting part; 102a. Stepped pin groove; 2. Right outer shell; 201. Right bearing mounting part; 202. Right connecting part; 202a. Pin groove; 3. Middle outer shell; 301. Middle mounting part; 301a. Side sealing block mounting cavity; 301b. Friction plate mounting cavity; 302. Middle connecting part; 4. Long shaft; 5. Friction plate; 6. Left one-way bearing; 7. Right one-way bearing; 8. Small inner diameter mounting cavity; 9. Large inner diameter mounting cavity; 10. Retaining rib; 11. Retaining groove; 12. Sealing ring; 13. Metal side sealing block; 1301. First abutment part; 1302. Second abutment part; 1303. Third abutment part; 14. Sealing abutment surface; 15. Pin. Detailed Implementation

[0053] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0054] like Figure 1-11 As shown, this embodiment provides a unidirectional torque hinge with adjustable torque force, which is mainly composed of a left outer shell 1, a right outer shell 2, a middle outer shell 3, a long shaft 4, a friction plate 5, a unidirectional bearing, a sealing ring 12, a metal side sealing block 13, and a pin 15, etc.

[0055] like Figure 5As shown, the left outer shell 1 includes an integrally formed left bearing mounting portion 101 and a left connecting portion 102. The left connecting portion 102 has a connecting hole for connecting the hinged left outer shell 1 to other structures. The left bearing mounting portion 101 has a stepped mounting cavity, which includes a small inner diameter mounting cavity 8 and a large inner diameter mounting cavity 9 arranged sequentially. Multiple retaining ribs 10 are evenly distributed on the inner wall of the large inner diameter mounting cavity 9. The left connecting portion 102 has a stepped pin through groove 102a.

[0056] like Figure 6 As shown, the right outer shell 2 includes an integrally formed right bearing mounting portion 201 and a right connecting portion 202. The right connecting portion 202 has a connecting hole for connecting the hinged right outer shell 2 to other structures. The right bearing mounting portion 201 has a stepped mounting cavity, which includes a small inner diameter mounting cavity 8 and a large inner diameter mounting cavity 9 arranged sequentially. The inner wall of the large inner diameter mounting cavity 9 is provided with multiple retaining ribs 10. The back of the right connecting portion 202 has a pin groove 202a.

[0057] like Figure 7 As shown, the inner shell 3 includes an integrally formed central mounting portion 301 and a central connecting portion 302. The central connecting portion 302 has a connecting hole for connecting the hinged inner shell 3 to other structures. The central mounting portion 301 has a side sealing block mounting cavity 301a and a friction plate mounting cavity 301b, with the side sealing block mounting cavity 301a symmetrically arranged on both sides of the friction plate mounting cavity 301b. The inner diameter of the friction plate mounting cavity 301b decreases towards the center.

[0058] like Figure 8 As shown, the one-way bearing is cylindrical, and three slots 11 are evenly distributed along its axial direction on the outer wall of the one-way bearing. It should be noted that the structural characteristics of the one-way bearing itself are existing technology, that is, the inner and outer rings of the one-way bearing can only rotate in one direction, and cannot rotate in both clockwise and counterclockwise directions.

[0059] like Figure 9 As shown, the metal side sealing block 13 includes a first abutting portion 1301, a second abutting portion 1302, and a third abutting portion 1303 connected in sequence. The metal side sealing block 13 is cross-sectioned along the direction through the axis, and its cross-sectional shape is T-shaped. The first abutting portion 1301 is cross-sectioned along the direction perpendicular to the axis, and its cross-sectional shape is rectangular at one end and arc-shaped at the other end. The second abutting portion 1302 is cross-sectioned along the direction perpendicular to the axis, and its cross-sectional shape is rectangular at one end and arc-shaped at the other end. The third abutting portion 1303 is cross-sectioned along the direction perpendicular to the axis, and its cross-sectional shape is circular.

[0060] like Figure 10As shown, one end of the friction plate 5 is rectangular, and the other end is arc-shaped. The arc-shaped part of the friction plate 5 has a central hole so that the long shaft 4 can pass through.

[0061] Based on the above structure, the installation and assembly are performed as follows:

[0062] Twenty-four friction plates 5 are axially mounted within the friction plate mounting cavity 301b along the long axis 4, wherein the cross-sectional shape of the friction plate mounting cavity 301b is adapted to the shape of the friction plates 5. Therefore, the friction plates 5 rotate as the inner housing 3 rotates.

[0063] The inner casing 3 is mounted in the middle of the long shaft 4 via friction plates 5. That is, the long shaft 4 passes through 24 friction plates 5 and is interference-fitted with the 24 friction plates 5. The inner diameter of the metal friction plates 5 is 7.7 mm, the outer diameter of the long shaft 4 is 8 mm, and the interference fit is 0.15 mm in both directions.

[0064] A sealing ring 12 and a metal side sealing block 13 are installed between the middle mounting part 301 of the middle outer shell 3 and the left bearing mounting part 101 of the left outer shell 1, and between the middle mounting part 301 of the middle outer shell 3 and the right bearing mounting part 201 of the right outer shell 2. Specifically, the first abutting part 1301 and the second abutting part 1302 of the metal side sealing block 13 are installed in the side sealing block mounting cavity 301a, and the outer wall shape of the first abutting part 1301 and the second abutting part 1302 of the metal side sealing block 13 is adapted to the inner wall shape of the side sealing block mounting cavity 301a; a sealing abutting surface 14 is provided at the connection between the side sealing block mounting cavity 301a and the friction plate mounting cavity 301b, and the first abutting part 1301 abuts against the sealing abutting surface 14; the sealing ring 12 is sleeved on the outside of the third abutting part 1303.

[0065] The inner diameter of the large inner diameter mounting cavity 9 of the left bearing mounting part 101 or the large inner diameter mounting cavity 9 of the right bearing mounting part 201 is adapted to the outer diameter of their corresponding sealing rings 12. The length of the retaining rib 10 is less than the axial length of the large inner diameter mounting cavity 9. The length of the retaining rib 10 on the inner wall of the large inner diameter mounting cavity 9 is less than the axial length of the large inner diameter mounting cavity 9. The opening at the end of the large inner diameter mounting cavity 9 away from the sealing ring 12 is aligned with one end of the retaining rib 10. The sealing ring 12 extends into the large inner diameter mounting cavity 9, with one side abutting against the end of the retaining rib 10 and the other side abutting against the metal side seal block 13.

[0066] A left one-way bearing 6 is installed between the left outer shell 1 and the left end of the long shaft 4, and a right one-way bearing 7 is installed between the right outer shell 2 and the right end of the long shaft 4. The left one-way bearing 6 and the right one-way bearing 7 rotate in the same direction. Either the left one-way bearing 6 or the right one-way bearing 7 abuts against the third abutment part 1303. The left one-way bearing 6 is installed inside the large inner diameter mounting cavity 9. The outer diameter of the left one-way bearing 6 is larger than the inner diameter of the small inner diameter mounting cavity 8 but less than or equal to the inner diameter of the large inner diameter mounting cavity 9. Multiple slots 11 are formed along the axial direction on the outer wall of the left one-way bearing 6, and these slots 11 cooperate with retaining ribs 10. The long shaft 4 is tightly fitted to the inner wall of the left one-way bearing 6, and the long shaft 4 passes through the left one-way bearing 6 and extends into the small inner diameter mounting cavity 8. A right one-way bearing 7 is installed in the large-diameter mounting cavity 9. The outer diameter of the right one-way bearing 7 is larger than the inner diameter of the small-diameter mounting cavity 8 but smaller than or equal to the inner diameter of the large-diameter mounting cavity 9. Multiple slots 11 are formed along the axial direction on the outer wall of the right one-way bearing 7, and these slots 11 cooperate with retaining ribs 10. A long shaft 4 is tightly fitted to the inner wall of the right one-way bearing 7, and the long shaft 4 passes through the right one-way bearing 7 and extends into the small-diameter mounting cavity 8.

[0067] like Figure 3 and 4 As shown, the number of friction plates 5 can be adjusted, from 24 friction plates 5 to 12 friction plates 5, thereby adjusting the unidirectional torque force. It should be noted that the unidirectional torque force can also be adjusted by adjusting the interference fit between the friction plates 5 and the long shaft 4.

[0068] like Figure 2 and 11 As shown, a pin 15 is connected between the left connecting part 102 of the left outer shell 1 and the right connecting part 202 of the right outer shell 2. The cross-section of the pin 15 is T-shaped, and one end of the pin 15 passes through the stepped pin groove 102a and extends into the pin recess 202a.

[0069] Therefore, the hinge product produced in this embodiment can have torque force when opening and no torque force when closing; or, no torque force when opening and torque force when closing. The product internally utilizes the interference fit between the metal friction plate 5 and the long shaft 4 to generate friction, thereby forming torque force. The torque force of the hinge can be set by changing the number of friction plates 5: for example, when torque force is required for opening, the hinge can open slowly, or it can stop at any point within the torque value; when closing, it can close very smoothly.

[0070] The working process of this embodiment will be further described below:

[0071] 24 friction plates 5 are installed in the friction plate mounting cavity 301b of the inner housing 3.

[0072] The long shaft 4 passes through and is interference-fitted with 24 friction plates 5. The metal side sealing block 13 passes through the long shaft 4 and is installed at both ends of the middle connecting part 302 of the inner housing 3 to perform side sealing at both ends.

[0073] A sealing ring 12 is fitted onto the third abutment portion 1303 of the metal side sealing block 13, and one-way bearings (i.e., left one-way bearing 6 and right one-way bearing 7) are installed at both ends of the long shaft 4, so that the one-way bearings abut against the third abutment portion 1303.

[0074] Install the left outer casing 1 and the right outer casing 2 along the groove 11 on the outer wall of the one-way bearing.

[0075] Install pin 15 between the left outer casing 1 and the right outer casing 2.

[0076] When rotating in the direction without torque, there is relative movement between the one-way bearing and the long shaft 4; when rotating in the direction with torque, the one-way bearing and the long shaft 4 lock together.

[0077] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model using the disclosed methods and techniques, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. Therefore, all equivalent changes made based on the shape, structure, and principle of this utility model without departing from its technical solution should be covered within the protection scope of this utility model.

Claims

1. A unidirectional torque hinge with adjustable torque force, characterized in that, It includes a long shaft (4), at least one first housing and at least one second housing; N friction plates (5) are interference-connected on the long shaft (4), wherein N≥1; The friction plate (5) is installed in the friction plate mounting cavity (301b) of the first housing and the friction plate (5) rotates with the rotation of the first housing; A one-way bearing is installed between the long shaft (4) and the second housing.

2. The unidirectional torque hinge with adjustable torque force as described in claim 1, characterized in that, The friction plate (5) has a rectangular shape at one end and an arc shape at the other end. The cross-sectional shape of the friction plate mounting cavity (301b) is adapted to the shape of the friction plate (5).

3. The unidirectional torque hinge with adjustable torque force as described in claim 2, characterized in that, The first outer shell is one in number and is a middle outer shell (3). The middle outer shell (3) is installed in the middle position of the long shaft (4) by N friction plates (5); The number of the second outer shell is two, and the two second outer shells are a left outer shell (1) and a right outer shell (2). A left one-way bearing (6) is installed between the left outer shell (1) and the left end of the long shaft (4), and a right one-way bearing (7) is installed between the right outer shell (2) and the right end of the long shaft (4). The left one-way bearing (6) and the right one-way bearing (7) rotate in the same direction.

4. A unidirectional torque hinge with adjustable torque force as described in claim 3, characterized in that, The left outer casing (1) includes an integrally formed left bearing mounting part (101) and a left connecting part (102); The left bearing mounting part (101) has a stepped mounting cavity, which includes a small inner diameter mounting cavity (8) and a large inner diameter mounting cavity (9) arranged in sequence. Multiple retaining ribs (10) are evenly distributed on the inner wall of the large inner diameter mounting cavity (9). The left one-way bearing (6) is installed in the large inner diameter mounting cavity (9). The outer diameter of the left one-way bearing (6) is larger than the inner diameter of the small inner diameter mounting cavity (8) and smaller than or equal to the inner diameter of the large inner diameter mounting cavity (9). Multiple slots (11) are provided on the outer wall of the left one-way bearing (6) along its axial direction. The slots (11) cooperate with the retaining ribs (10). The long shaft (4) is tightly fitted to the inner wall of the left one-way bearing (6), and the long shaft (4) passes through the left one-way bearing (6) and extends into the small inner diameter mounting cavity (8).

5. A unidirectional torque hinge with adjustable torque force as described in claim 3, characterized in that, The right outer casing (2) includes an integrally formed right bearing mounting part (201) and a right connecting part (202); The right bearing mounting part (201) has a stepped mounting cavity, which includes a small inner diameter mounting cavity (8) and a large inner diameter mounting cavity (9) arranged in sequence. The inner wall of the large inner diameter mounting cavity (9) is provided with a plurality of retaining ribs (10), and the length of the retaining ribs (10) is less than the axial length of the large inner diameter mounting cavity (9). The right one-way bearing (7) is installed in the large inner diameter mounting cavity (9). The outer diameter of the right one-way bearing (7) is larger than the inner diameter of the small inner diameter mounting cavity (8) and smaller than or equal to the inner diameter of the large inner diameter mounting cavity (9). Multiple slots (11) are provided on the outer wall of the right one-way bearing (7) along its axial direction. The slots (11) cooperate with the retaining ribs (10). The long shaft (4) is tightly fitted to the inner wall of the right one-way bearing (7), and the long shaft (4) passes through the right one-way bearing (7) and extends into the small inner diameter mounting cavity (8).

6. A unidirectional torque hinge with adjustable torque force as described in claim 3, characterized in that, The inner outer shell (3) includes an integrally formed inner mounting part (301) and inner connecting part (302). The inner mounting part (301) has a side sealing block mounting cavity (301a) and a friction plate mounting cavity (301b). The side sealing block mounting cavity (301a) is symmetrically arranged on both sides of the friction plate mounting cavity (301b). N friction plates (5) are axially mounted in the friction plate mounting cavity (301b) along the long axis (4).

7. A unidirectional torque hinge with adjustable torque force as described in claim 6, characterized in that, A sealing ring (12) and a metal side sealing block (13) are installed between the middle mounting part (301) and the left bearing mounting part (101) of the left outer shell (1) and between the middle mounting part (301) and the right bearing mounting part (201) of the right outer shell (2); The metal side sealing block (13) is installed in the side sealing block mounting cavity (301a). One side of the metal side sealing block (13) abuts against the side opening of the friction plate mounting cavity (301b), and the other side abuts against the sealing ring (12). The left bearing mounting part (101) or the right bearing mounting part (201) respectively abuts against its corresponding sealing ring (12).

8. A unidirectional torque hinge with adjustable torque force as described in claim 7, characterized in that, The inner diameter of the large inner diameter mounting cavity (9) of the left bearing mounting part (101) or the inner diameter of the large inner diameter mounting cavity (9) of the right bearing mounting part (201) are respectively adapted to the outer diameter of their corresponding sealing rings (12). The length of the retaining rib (10) on the inner wall of the large inner diameter mounting cavity (9) is less than the axial length of the large inner diameter mounting cavity (9), and the opening of the end of the large inner diameter mounting cavity (9) away from the sealing ring (12) is aligned with the end of the retaining rib (10). The sealing ring (12) extends into the large inner diameter mounting cavity (9) and one side abuts against the end of the retaining rib (10), while the other side abuts against the metal side sealing block (13).

9. A unidirectional torque hinge with adjustable torque force as described in claim 7, characterized in that, The metal side sealing block (13) includes a first abutting part (1301), a second abutting part (1302) and a third abutting part (1303) connected in sequence; The first abutting part (1301) has a rectangular cross-section at one end and an arc shape at the other end; The cross-section of the second abutment part (1302) is rectangular at one end and arc-shaped at the other end; The cross-sectional shape of the third abutment part (1303) is circular; The first abutting part (1301) and the second abutting part (1302) of the metal side sealing block (13) are installed in the side sealing block mounting cavity (301a), and the outer wall shape of the first abutting part (1301) and the second abutting part (1302) of the metal side sealing block (13) are adapted to the inner wall shape of the side sealing block mounting cavity (301a); A sealing contact surface (14) is provided at the connection between the side sealing block mounting cavity (301a) and the friction plate mounting cavity (301b), and the first contact part (1301) abuts against the sealing contact surface (14); The sealing ring (12) is fitted onto the outside of the third abutment portion (1303); The left one-way bearing (6) or the right one-way bearing (7) abuts against the third abutment part (1303).

10. A unidirectional torque hinge with adjustable torque force as described in claim 3, characterized in that, A pin (15) is connected between the left connecting part (102) of the left outer shell (1) and the right connecting part (202) of the right outer shell (2). A pin groove (202a) is provided on the back of the right connecting part (202), and a stepped pin through groove (102a) is provided on the left connecting part (102). The cross-section of the pin (15) is T-shaped, and one end of the pin (15) passes through the stepped pin through groove (102a) and extends into the pin groove (202a).

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