A high seal brake

Abstract

This invention relates to the field of braking technology, and more specifically, to a high-sealing brake. It includes: a caliper assembly comprising a caliper body and a screw hole, the screw hole being formed within the caliper body; a screw assembly inserted into the screw hole; a bushing assembly, configured as an annular shape, the bushing assembly being disposed axially between the caliper body and the screw assembly along the screw hole; and a sealing assembly comprising a dynamic sealing portion and a static sealing portion; the dynamic sealing portion being disposed between the bushing assembly and the screw assembly, and abutting against both the screw assembly and the bushing assembly; the static sealing portion being disposed between the caliper body and the bushing assembly, and abutting against both the caliper body and the bushing assembly; the contact surface between the bushing assembly and the dynamic sealing portion is the bushing surface; the projection surface of the bushing surface onto the caliper body along the radial direction of the bushing assembly is the caliper body surface; the roughness of the bushing surface is less than the roughness of the caliper body surface; the braking state includes: the screw assembly rotating, causing the dynamic sealing portion to move relative to the bushing assembly. This solves the problem of poor brake sealing performance.

Description

Technical Field

[0001] This invention relates to the field of braking technology, and more specifically, to a high-sealing brake. Background Technology

[0002] A high-seal brake is a device that slows down, stops, or keeps a moving mechanism stationary. In a vehicle braking system, it is installed on the side of the wheel or drive shaft and converts kinetic energy into heat energy through friction pairs to achieve braking. A high-seal brake typically includes a brake unit, caliper body, screw, sealing ring, and bushing. The brake unit is connected to the screw drive and is used to press the brake disc. The sealing ring is embedded in the groove of the inner hole of the caliper body and is interference-fitted with the outer circle of the screw to form a seal. The bushing is used to guide the rotational movement of the screw. When the service brake is applied, hydraulic oil drives the piston in the brake unit to produce axial displacement. When the parking brake is applied, the screw is manually pulled to produce rotational movement.

[0003] In existing high-sealing brakes, the sealing ring is subjected to dual combined sealing pressures during service braking and parking braking, including hydraulic pressure (caused by the axial movement of the piston) and rotational pressure (caused by the rotation of the screw). This creates a very harsh sealing environment, making it easy for microscopic leakage channels to form at the contact point between the sealing ring and the caliper body, resulting in brake fluid or grease leakage. Summary of the Invention

[0004] To address the problem of poor sealing performance in brakes, this invention provides a high-sealing brake, comprising:

[0005] The clamp assembly includes a clamp body and a screw hole, with the screw hole located within the clamp body;

[0006] Screw assembly, the screw assembly is inserted into the screw hole;

[0007] The bushing assembly is configured as an annular shape; the bushing assembly is disposed between the clamp body and the screw assembly along the axial direction of the screw hole;

[0008] A sealing assembly includes a dynamic sealing part and a static sealing part; the dynamic sealing part is disposed between the bushing assembly and the screw assembly, and abuts against the screw assembly and the bushing assembly respectively; the static sealing part is disposed between the clamp body and the bushing assembly, and abuts against the clamp body and the bushing assembly respectively.

[0009] The contact surface between the bushing assembly and the dynamic seal is the bushing surface; the projection surface of the bushing surface onto the clamp body along the radial direction of the bushing assembly is the clamp body surface; the roughness of the bushing surface is less than the roughness of the clamp body surface.

[0010] The braking state of a high-sealing brake includes: the rotation of the screw assembly causing the moving seal to move relative to the bushing assembly.

[0011] Optionally, the bushing assembly includes a support and a bushing unit;

[0012] The support part and the bushing unit are connected axially along the screw hole, and the outer peripheral surface of the support part abuts against the clamp body; the bushing unit abuts against the dynamic sealing part; the static sealing part is located between the clamp body and the bushing unit, and abuts against the clamp body and the bushing unit respectively.

[0013] Optionally, the bushing unit includes a first bushing portion and a second bushing portion; one end of the first bushing portion is connected to the support portion, and the other end of the first bushing portion is connected to the second bushing portion; the first bushing portion abuts against the dynamic sealing portion; the second bushing portion is radially disposed between the screw assembly and the clamp body along the screw hole; a static sealing portion is provided between the second bushing portion and the clamp body.

[0014] Optionally, the clamp assembly further includes a static sealing groove; the static sealing groove is disposed around the screw hole in the clamp body and at the junction of the clamp body and the second bushing; the static sealing part is disposed in the static sealing groove.

[0015] Optionally, the static sealing groove and the second bushing portion are spaced apart along the radial direction of the screw hole.

[0016] Optionally, the inner circumferential surface of the support abuts against the screw assembly; the bushing unit, the screw assembly, and the support together form a dynamic sealing groove, and the dynamic sealing part is assembled in the dynamic sealing groove.

[0017] Optionally, the clamp assembly further includes a bushing groove; the bushing groove is disposed within the clamp body and is arranged in a ring along the inner wall of the screw hole; the support portion and the first bushing portion are disposed within the bushing groove.

[0018] Optionally, the bushing groove includes a first groove and a second groove; the first groove and the second groove are connected axially along the screw hole, and the groove depth of the first groove along the screw hole is less than the groove depth of the second groove along the screw hole; the support part is disposed in the first groove and the first bushing part is disposed in the second groove.

[0019] Optionally, the screw assembly includes a screw section and a bearing section; the screw section is inserted into the screw hole and abuts against the dynamic seal; the bearing section is sleeved on the screw section and abuts against the clamp body, the screw section, the dynamic seal, and the bushing assembly respectively.

[0020] Optionally, the leakage rate of the dynamic seal is lower than that of the static seal.

[0021] Optionally, the clamp assembly also includes a braking unit; the braking unit is connected to the screw assembly and the clamp body; the braking state of the high-sealing brake includes: the screw assembly rotating to drive the braking unit to move.

[0022] To solve the problem of poor brake sealing performance, this invention has the following advantages:

[0023] By designing the dynamic seal to directly contact only the bushing surface with lower surface roughness, thus avoiding direct contact with the clamping body surface with higher surface roughness, the surface roughness of the dynamic seal mating interface is significantly reduced, thereby lowering the sealing leakage rate of the dynamic seal. Simultaneously, by adding a static seal, the sealing load originally concentrated on the dynamic seal is distributed and distributed, improving the stress and deformation state of the dynamic seal, thereby significantly optimizing its sealing operating environment and enhancing the overall reliability and durability of the sealing system. Attached Figure Description

[0024] Figure 1 A front view schematic diagram of a high-sealing brake according to one embodiment is shown;

[0025] Figure 2 A schematic diagram of a high-sealing brake structure according to one embodiment is shown;

[0026] Figure 3 A schematic diagram of a high-sealing brake screw assembly assembled in a clamp body according to one embodiment is shown;

[0027] Figure 4 It shows Figure 3 A cross-sectional view;

[0028] Figure 5 It shows Figure 4 Enlarged view of point A in the middle;

[0029] Figure 6 A cross-sectional schematic diagram of a bushing assembly of a high-sealing brake according to an embodiment is shown, assembled within the caliper body.

[0030] Figure 7 It shows Figure 6 Enlarged view of point B in the middle;

[0031] Figure 8 A schematic diagram of the assembly state of the screw assembly and bushing assembly of a high-sealing brake according to an embodiment is shown;

[0032] Figure 9 It shows Figure 8 A cross-sectional view;

[0033] Figure 10 A schematic diagram of the assembly state of the bushing assembly and sealing assembly of a high-sealing brake according to an embodiment is shown;

[0034] Figure 11 It shows Figure 10 A cross-sectional view.

[0035] Reference numerals: 10 Clamp assembly; 11 Clamp body; 12 Bushing groove; 121 First groove; 122 Second groove; 13 Static sealing groove; 14 Screw hole; 15 Braking unit; 20 Bushing assembly; 21 Support part; 22 Bushing unit; 221 First bushing part; 222 Second bushing part; 223 Dynamic sealing groove; 30 Sealing assembly; 31 Dynamic sealing part; 32 Static sealing part; 40 Screw assembly; 41 Screw part; 42 Bearing part. Detailed Implementation

[0036] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0037] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0038] High-seal brakes are key actuators in vehicle braking systems, widely used in hydraulic braking systems of various passenger cars, commercial vehicles, and construction machinery to achieve service braking, parking braking, and emergency braking functions. A high-seal brake typically includes a caliper body 11, a braking unit 15, a screw, a sealing ring, and bushings. The braking unit 15 refers to the assembly that directly generates braking force, including at least a piston, brake pads, and a backing plate for supporting the brake pads. The brake pads are linked to the piston and can move closer to or further away from the brake disc as the piston moves axially. The screw and piston are connected via a threaded pair or a ball screw pair. The external thread of the screw meshes with the internal thread (or nut) of the piston. When the screw rotates around its axis, the rotational motion is converted into axial linear motion of the piston through the threaded engagement, thereby pushing the brake pads to press against the brake disc; when rotating in the opposite direction, the piston and brake pads return to their original positions. A sealing ring is required between the inner bore of the caliper body 11 and the screw to prevent leakage of brake fluid or grease. The sealing ring is typically embedded in the groove of the inner hole of the clamp body 11, with an interference fit to the outer diameter of the screw. The inner diameter of the sealing ring contacts the screw, and the outer diameter contacts the inner wall of the clamp body 11. The sealing effect of the contact interface between the outer diameter of the sealing ring and the clamp body 11 directly depends on the surface quality of the mating surface of the inner hole of the clamp body 11. The bushing guides the rotational movement of the screw. During service braking, the hydraulic oil pressure causes the piston to move axially, thus applying axial sealing pressure to the dynamic seal 31. During parking braking, the rotational movement of the screw applies lateral (radial) torsional sealing pressure to the dynamic seal 31. The combined load of these two factors makes the operating conditions of the dynamic seal 31 quite demanding. To control manufacturing costs, the surface roughness of the inner hole of the clamp body 11 is often relatively large, without precision grinding. This makes it easy for microscopic leakage channels to form at the contact point between the sealing ring and the clamp body 11, causing brake fluid or grease to leak out. If the leakage is to be improved by reducing the surface roughness of the inner hole of the clamp body 11, a high-cost precision machining process must be introduced, which contradicts the need for low-cost mass production. In other words, how to effectively improve the leakage problem at the contact between the dynamic seal part 31 and the clamp body 11 under harsh sealing environment without significantly increasing manufacturing costs has become a technical problem that urgently needs to be solved in this field.

[0039] Example 1:

[0040] In this embodiment, as Figure 5 and Figure 7 As shown, the high-seal brake includes: a clamp assembly 10; including a clamp body 11 and a screw hole 14, the clamp body 11 serving as a support frame for the high-seal brake and providing a mounting base, the screw hole 14 being formed within the clamp body 11; as Figure 1 , Figure 3 , Figure 4 and Figure 6As shown, there is a screw assembly 40; the screw assembly 40 is inserted into the screw hole 14, which provides a precise guiding and receiving channel for the screw assembly 40; the bushing assembly 20 is annular; the bushing assembly 20 is disposed between the clamp body 11 and the screw assembly 40 along the axial direction of the screw hole 14. The bushing assembly 20 avoids direct contact between the screw assembly 40 and the clamp body 11, thereby reducing friction and wear during relative movement, providing wear-resistant and replaceable mating surfaces, and extending the overall life of the high-sealing brake.

[0041] The sealing assembly 30 includes a dynamic sealing part 31 and a static sealing part 32. Through the double sealing of the dynamic sealing part 31 and the static sealing part 32, all-round sealing protection between the screw assembly 40 and the clamp body 11 is achieved. The dynamic sealing part 31 is located between the bushing assembly 20 and the screw assembly 40 and abuts against the screw assembly 40 and the bushing assembly 20 respectively. The dynamic sealing part 31 is used to maintain a tight fit with the screw assembly 40 and the bushing assembly 20 respectively under dynamic conditions. When the screw assembly 40 rotates, the dynamic sealing part 31 adapts to the movement by its own elasticity, thereby continuously playing a reliable sealing role in the moving state and effectively preventing sealing failure. The static sealing part 32 is located between the clamp body 11 and the bushing assembly 20 and abuts against the clamp body 11 and the bushing assembly 20 respectively. The static sealing part 32 effectively prevents sealing leakage between the clamp body 11 and the bushing assembly 20. It cooperates with the dynamic sealing part 31 to form a complete sealing isolation.

[0042] The contact surface between the bushing assembly 20 and the dynamic seal 31 is the bushing surface; the projection surface of the bushing surface onto the clamp body 11 along the radial direction of the bushing assembly 20 is the clamp body surface; the roughness of the bushing surface is less than that of the clamp body surface. Specifically, the clamp body 11 is made of cast iron, while the bushing assembly 20 is formed by powder metallurgy. By setting the dynamic seal 31 to only directly contact the bushing surface with lower surface roughness, and avoiding direct contact with the clamp body surface with higher surface roughness, the surface roughness of the mating interface of the dynamic seal 31 is significantly reduced, thereby reducing the sealing leakage rate of the dynamic seal 31. At the same time, by adding a static seal 32, the sealing load originally concentrated on the dynamic seal 31 is distributed and distributed, improving the stress and deformation state of the dynamic seal 31, thereby significantly optimizing its sealing working environment and improving the overall reliability and durability of the sealing system.

[0043] The braking state of the high-sealing brake includes: the screw assembly 40 rotates, causing the moving seal part 31 to move relative to the bushing assembly 20.

[0044] Furthermore, such as Figure 10 and Figure 11As shown, the bushing assembly 20 includes a support portion 21 and a bushing unit 22; the support portion 21 and the bushing unit 22 are connected axially along the screw hole 14. Preferably, the support portion 21 and the bushing unit 22 adopt an integral molding structure to ensure the connection strength and coaxiality between them, reduce assembly errors, and the outer peripheral surface of the support portion 21 abuts against the clamp body 11 to restrict the radial movement of the bushing assembly 20 as a whole, thereby improving the radial positioning accuracy and overall stability of the bushing assembly 20 during operation and avoiding sealing failure or accelerated wear caused by radial movement. The bushing unit 22 abuts against the dynamic sealing part 31 to provide a low-roughness, high-wear-resistant mating surface for the dynamic sealing part 31, thereby optimizing the dynamic sealing environment of the dynamic sealing part 31. The static sealing part 32 is disposed between the clamp body 11 and the bushing unit 22, and abuts against both the clamp body 11 and the bushing unit 22 respectively. Through the above configuration, the bushing unit 22 not only serves as the direct mating interface of the dynamic sealing part 31, but also as the installation and pressing interface of the static sealing part 32, thereby achieving dual sealing contact with both the dynamic sealing part 31 and the static sealing part 32, further improving the integration.

[0045] Furthermore, such as Figure 10 and Figure 11 As shown, the bushing unit 22 includes a first bushing portion 221 and a second bushing portion 222. The first bushing portion 221 is disposed axially between the screw assembly 40 and the clamp body 11 along the screw hole 14. One end of the first bushing portion 221 is connected to the support portion 21, and the other end of the first bushing portion 221 is connected to the second bushing portion 222. The first bushing portion 221 abuts against the dynamic sealing portion 31. The second bushing portion 222 is disposed radially between the screw assembly 40 and the clamp body 11 along the screw hole 14. A static sealing portion 32 is provided between the second bushing portion 222 and the clamp body 11. In this embodiment, the first bushing portion 221 is specifically used to cooperate with the dynamic sealing portion 31 to undertake the dynamic sealing function; the second bushing portion 222 is specifically used to cooperate with the static sealing portion 32 to undertake the static sealing function. By assigning the dynamic sealing and static sealing functions to two relatively independent bushing parts, the dynamic sealing part 31 and the static sealing part 32 are separated and sealed independently, avoiding mutual interference between the two, reducing the coupling complexity of the seal, and improving the overall sealing reliability.

[0046] Furthermore, such as Figure 7As shown, the clamp assembly 10 also includes a static sealing groove 13, and the static sealing part 32 is disposed in the static sealing groove 13. By adding the static sealing groove 13, a precise installation space is provided for the static sealing part 32, instead of relying on flat pressing for sealing, to avoid the seal from rolling, twisting or being squeezed out during assembly, and to ensure that the static sealing part 32 always maintains a stable sealing state during long-term use. The static sealing groove 13 is disposed around the screw hole 14 in the clamp body 11 and at the junction of the clamp body 11 and the second bushing part 222, rather than in the second bushing part 222. This will not affect the thickness and strength of the second bushing part 222 and will reduce costs.

[0047] Furthermore, such as Figure 7 As shown, the static sealing groove 13 and the second bushing part 222 are spaced apart along the radial direction of the screw hole 14. The static sealing part 32 in the static sealing groove 13 only bears the sealing pressure from the axial direction of the screw hole 14, dispersing the sealing pressure of the dynamic sealing part 31 in the axial direction. Since the frequency of the axial sealing pressure generated by the service brake is much higher than the frequency of the radial sealing pressure generated by the parking brake in the actual use of the high sealing brake, the static sealing part 32 can effectively improve the axial sealing pressure of the dynamic sealing part 31.

[0048] Furthermore, such as Figure 5 and Figure 7 As shown, the inner circumferential surface of the support portion 21 abuts against the screw assembly 40, effectively limiting the overall radial direction of the bushing assembly 20. This significantly improves the radial positioning accuracy and overall stability of the bushing assembly 20 during operation, preventing seal failure or abnormal wear due to radial movement. The bushing unit 22, screw assembly 40, and support portion 21 together form a dynamic sealing groove 223. Since the inner circumferential surface of the support portion 21 abuts against the screw assembly 40, the inner diameter of the support portion 21 is smaller than that of the bushing. The inner diameter of unit 22 naturally forms an annular groove space with bushing unit 22, screw assembly 40 and support 21, which is the dynamic sealing groove 223. There is no need to process grooves separately on screw assembly 40 or bushing unit 22, reducing the complexity of parts and reducing processing costs. The dynamic sealing part 31 is assembled in the dynamic sealing groove 223. The wall of the dynamic sealing groove 223 restricts the position of the dynamic sealing part 31 in both radial and axial directions, preventing it from being carried out, twisted or rolled when the screw assembly 40 rotates.

[0049] Furthermore, such as Figure 7As shown, the clamp assembly 10 also includes a bushing groove 12; the bushing groove 12 is disposed inside the clamp body 11 and is arranged in a ring along the inner wall of the screw hole 14; the support part 21 and the first bushing part 221 are disposed inside the bushing groove 12, and the bushing groove 12 provides the support part 21 and the first bushing part 221 with installation space and precise installation reference, ensuring that the two can obtain accurate and consistent axial and radial positioning during the assembly process, thereby reducing the assembly difficulty and improving the assembly accuracy and consistency.

[0050] Furthermore, such as Figure 7 As shown, the bushing groove 12 includes a first groove 121 and a second groove 122; the first groove 121 and the second groove 122 are connected axially along the screw hole 14, and the groove depth of the first groove 121 along the screw hole 14 radially is less than the groove depth of the second groove 122 along the screw hole 14 radially. By increasing the depth of the second groove 122, sufficient space is provided for the formation of the dynamic sealing groove 223; the support part 21 is provided in the first groove 121, and the first bushing part 221 is provided in the second groove 122, realizing the partitioned positioning installation of the support part 21 and the first bushing part 221.

[0051] Furthermore, such as Figure 8 and Figure 9 As shown, the screw assembly 40 includes a screw portion 41 and a bearing portion 42. The screw portion 41 is inserted into the screw hole 14 and abuts against the dynamic seal portion 31. When braking, the screw portion 41 rotates around its axis, causing the dynamic seal portion 31 to move relative to the bushing assembly 20. The bearing portion 42 is sleeved on the screw portion 41 and abuts against the clamp body 11, the screw portion 41, the dynamic seal portion 31, and the bushing assembly 20 respectively. The bearing portion 42 is used to support the rotational movement of the screw portion 41, reduce the frictional resistance between the screw portion 41 and the surrounding components, and reduce energy loss and wear during rotation.

[0052] Furthermore, the sealing leakage rate of the dynamic sealing part 31 is lower than that of the static sealing part 32. Since the dynamic sealing part 31 is subjected to both axial hydraulic pressure and radial torsional pressure during braking, it is in a dynamic sealing state for a long time. Its sealing environment is more severe than that of the static sealing part 32. Therefore, the sealing performance of the dynamic sealing part 31 needs to be better than that of the static sealing part 32 to ensure the overall service life and reliability of the high-sealing brake. Specifically, the material resilience, wear resistance, extrusion resistance, media resistance, and temperature resistance of the dynamic sealing part 31 are better than those of the static sealing part 32.

[0053] Furthermore, such as Figure 2 As shown, the clamp assembly 10 also includes a braking unit 15; the braking unit 15 is connected to the screw assembly 40 and the clamp body 11; the braking state of the high-sealing brake includes: the screw assembly 40 rotates to drive the braking unit 15 to move, and the braking unit 15 is driven to contact the brake disc to achieve braking.

[0054] During service braking, the hydraulic system supplies pressurized brake fluid to the high-seal brake. At this time, the screw assembly 40 does not rotate, and the brake fluid pressure acts directly on the brake unit 15, pushing it to move axially, causing it to contact and press against the brake disc, thus achieving service braking. During this process, the dynamic seal 31 maintains dynamic contact with the screw assembly 40 and the bushing assembly 20. However, since the screw assembly 40 does not rotate, the dynamic seal 31 mainly bears the axial sealing pressure from the hydraulic system. Simultaneously, the static seal 32, located within the static sealing groove 13, only bears the axial sealing pressure, effectively sharing the axial load of the dynamic seal 31.

[0055] During parking brake operation, the external drive screw assembly 40 rotates around its axis, converting the rotational motion into axial linear motion of the brake unit 15 through threaded engagement. This, in turn, pushes the brake unit 15 to press against the brake disc, thus achieving parking brake operation. During this process, the rotational motion of the screw portion 41 causes relative movement of the dynamic seal portion 31 relative to the bushing assembly 20. The dynamic seal portion 31, relying on its own elasticity, follows the movement of the screw portion 41, maintaining a tight fit with the screw assembly 40 and the bushing assembly 20 under dynamic conditions, primarily bearing the sealing pressure in the radial direction.

[0056] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A high-sealing brake, characterized in that, The high-sealing brake includes: A clamp assembly includes a clamp body and a screw hole, wherein the screw hole is formed in the clamp body; A screw assembly, wherein the screw assembly is inserted into the screw hole; A bushing assembly is configured as an annular shape; the bushing assembly is disposed between the clamp body and the screw assembly along the axial direction of the screw hole; A sealing assembly includes a dynamic sealing portion and a static sealing portion; the dynamic sealing portion is disposed between the bushing assembly and the screw assembly, and abuts against the screw assembly and the bushing assembly respectively; the static sealing portion is disposed between the clamp body and the bushing assembly, and abuts against the clamp body and the bushing assembly respectively. The contact surface between the bushing assembly and the dynamic seal is the bushing surface; the projection surface of the bushing surface onto the clamp body along the radial direction of the bushing assembly is the clamp body surface; the roughness of the bushing surface is less than the roughness of the clamp body surface. The braking state of the high-sealing brake includes: the screw assembly rotating to drive the dynamic sealing part to move relative to the bushing assembly.

2. The high-sealing brake according to claim 1, characterized in that, The bushing assembly includes a support portion and a bushing unit; The support portion is connected to the bushing unit along the axial direction of the screw hole, and the outer peripheral surface of the support portion abuts against the clamp body; the bushing unit abuts against the dynamic sealing portion; the static sealing portion is disposed between the clamp body and the bushing unit, and abuts against the clamp body and the bushing unit respectively.

3. A high-sealing brake according to claim 2, characterized in that, The bushing unit includes a first bushing portion and a second bushing portion; one end of the first bushing portion is connected to the support portion, and the other end of the first bushing portion is connected to the second bushing portion; the first bushing portion abuts against the dynamic sealing portion; the second bushing portion is radially disposed between the screw assembly and the clamp body along the screw hole; the static sealing portion is provided between the second bushing portion and the clamp body.

4. A high-sealing brake according to claim 3, characterized in that, The clamp assembly further includes a static sealing groove; the static sealing groove is disposed around the screw hole in the clamp body and at the junction of the clamp body and the second bushing portion; the static sealing part is disposed in the static sealing groove.

5. A high-sealing brake according to claim 4, characterized in that, The static sealing groove and the second bushing portion are spaced apart along the radial direction of the screw hole.

6. A high-sealing brake according to claim 2, characterized in that, The inner circumferential surface of the support part abuts against the screw assembly; the bushing unit, the screw assembly and the support part together form a dynamic sealing groove, and the dynamic sealing part is assembled in the dynamic sealing groove.

7. A high-sealing brake according to claim 3, characterized in that, The clamp assembly further includes a bushing groove; the bushing groove is disposed within the clamp body and is arranged circumferentially along the inner wall of the screw hole; the support portion and the first bushing portion are disposed within the bushing groove.

8. A high-sealing brake according to claim 7, characterized in that, The bushing groove includes a first groove and a second groove; the first groove and the second groove are connected axially along the screw hole, and the groove depth of the first groove along the screw hole is less than the groove depth of the second groove along the screw hole; the support part is disposed in the first groove, and the first bushing part is disposed in the second groove.

9. A high-sealing brake according to claim 1, characterized in that, The screw assembly includes a screw section and a bearing section; the screw section is inserted into the screw hole and abuts against the dynamic seal section; the bearing section is sleeved on the screw section and abuts against the clamp body, the screw section, the dynamic seal section and the bushing assembly respectively.

10. A high-sealing brake according to claim 1, characterized in that, The leakage rate of the dynamic seal is less than that of the static seal.

11. A high-sealing brake according to claim 1, characterized in that, The clamp assembly further includes a braking unit; the braking unit is connected to the screw assembly and the clamp body; the braking state of the high-sealing brake includes: the screw assembly rotating to drive the braking unit to move.

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