A self-sealing gap-adjusted air disc brake

Abstract

The application relates to the field of brakes and discloses a self-sealing gap-adjusting air pressure disc brake, which comprises a clamp body, a cavity arranged in the clamp body, an adjuster assembly installed in the cavity, a brake block arranged at the lower end of the adjuster assembly, a guide shaft in sliding fit with the clamp body and a pressure arm for adjusting the movement of the adjuster assembly; an adapter adjusting block is arranged in the interior of the clamp body and has a first limiting table at the upper part and a second limiting table at the lower part; the interior of the clamp body is provided with a first limiting surface matched with the first limiting table; the adjusting sleeve is provided with a second limiting surface matched with the second limiting table; the clamp body further comprises a sealing surface, the adapter adjusting block is provided with a pressing surface matched with the sealing surface, and the upper end surface of the adapter adjusting block is provided with an axial threaded connection hole. The air pressure disc brake has the advantages of stable adjustment, reliable sealing, long service life and the like.

Description

Technical Field

[0001] This invention relates to the field of pneumatic disc brakes, and more particularly to a pneumatic disc brake with self-sealing clearance adjustment. Background Technology

[0002] The brake clearance self-adjustment mechanism, also known as the automatic brake clearance adjustment mechanism, is a key module in disc brakes. It automatically adjusts excessive clearance caused by wear on the brake pads or disc, ensuring the brake clearance remains within a specified range. Currently, most brake clearance self-adjustment mechanisms adjust for excessive clearance during vehicle braking to achieve a preset clearance. A traditional brake clearance self-adjustment mechanism mainly includes a main adjustment assembly, two push rods arranged on both sides of the main adjustment assembly, and threaded sleeves connected to the push rods. The main adjustment assembly includes a main adjustment shaft, a main adjustment gear mounted on the main adjustment shaft, a pressure plate, and a return spring. Driven gears meshing with the main adjustment gear are fixed on each of the two push rods.

[0003] Currently, conventional air disc brakes often use an interference fit method for sealing the brake clearance adjustment port with rubber parts, which leads to many shortcomings in actual use.

[0004] From a structural sealing performance perspective, harsh working environments during use can lead to aging, detachment, and seal failure in rubber components. Secondly, to enhance structural sealing, the assembly pressure of the sealing plug is often increased during the design phase. However, excessive assembly pressure can cause difficulties in assembly and improper installation during actual production. Furthermore, in after-sales service, it can lead to difficulties for maintenance personnel in disassembling the plug, and damage to the sealing structure during disassembly.

[0005] From the perspective of product installation space requirements, because easy gap adjustment is required, the adjusting rod of the adjuster is often higher than the outer surface of the clamp body. Also, because the sealing plug needs to be designed with a force-applying protrusion during disassembly, in actual production, the sealing plug may have a small gap with other accessories in the installation environment, or even interfere with them, reducing the product's versatility. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a pneumatic disc brake with self-sealing gap adjustment.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0008] A self-sealing gap adjustment pneumatic disc brake, characterized in that: it includes a caliper body, a chamber is provided inside the caliper body, an adjuster assembly is installed inside the chamber, a brake block is provided at the lower end of the adjuster assembly, and the adjuster assembly includes a guide shaft that slides with the caliper body, and a pressure arm for the movement of the adjuster assembly.

[0009] The regulator assembly also includes an adjusting sleeve and an adjusting screw;

[0010] It also includes a gap adjustment sealing structure, including an adapter adjustment block and a locking screw;

[0011] The adapter adjustment block is located inside the clamp body and has an upper first limiting platform and a lower second limiting platform; the clamp body is provided with a first limiting surface for matching the first limiting platform; the adjustment sleeve has a second limiting surface for matching the second limiting platform; the clamp body also includes a sealing surface, and the adapter adjustment block has a pressing surface that abuts against the sealing surface.

[0012] During the adjustment process, the locking screw and the threaded connection hole disengage, and the axial movement of the adapter adjustment block causes the first limiting platform and the first limiting surface to disengage and be limited, while the second limiting platform and the second limiting surface engage and limit. Rotating the adapter adjustment block drives the adjustment sleeve to rotate, thereby driving the adjustment screw that is threadedly engaged with it to move axially.

[0013] Preferably, the clamp body is provided with a chamber, and the adapter adjustment block, adjustment sleeve and adjustment screw are all arranged in the chamber. The clamp body is provided with a first limiting groove and a first guide groove in sequence below the mounting hole. The side of the first limiting groove is the first limiting surface and the upper end surface of the first guide groove is the sealing surface. The upper end surface of the adjustment sleeve is provided with a second limiting groove and the inner side of the second limiting groove is the second limiting surface.

[0014] Preferably, the first limiting platform has a polygonal cross-section, the second limiting platform has a polygonal cross-section, and the boss has a circular cross-section.

[0015] Preferably, a first seal is provided between the limiting screw and the clamp body, and / or a second seal is provided between the sealing surface and the boss.

[0016] Preferably, the upper end face of the adapter adjustment block is provided with a first adjustment hole and a threaded connection hole from top to bottom. The diameter of the first adjustment hole is larger than that of the threaded connection hole, and the threaded connection hole is located on the bottom surface of the first adjustment hole.

[0017] Preferably, a guide post is provided on the lower end face of the second limiting stage.

[0018] Preferably, the upper end of the adjusting sleeve extends through and connects to the mating cavity of the adjusting sleeve, and the mating cavity is provided with an internal thread, and the adjusting screw is threadedly connected to the mating cavity; it also includes a return spring, the upper end of the return spring is mated and limited by the guide post, and the lower end abuts against the adjusting screw in the mating cavity.

[0019] Because the present invention adopts the above technical solution, it has the following significant technical effects:

[0020] This new structure improves the sealing method, solving the problem of seal failure caused by rubber aging from a material perspective. Structurally, the self-locking clamping force of the sealing screw and adapter adjustment block, combined with the O-ring, greatly enhances sealing reliability. From a production perspective, this structure helps improve the product assembly qualification rate. From an after-sales maintenance perspective, this structure improves the convenience of maintenance and reduces the probability of damaged parts requiring repair. From a product compatibility perspective, the built-in adjustment block reduces the product's installation space requirements and improves its versatility. From a product functional reliability perspective, this structure effectively prevents seizing or braking clearance failures caused by large adjustment thread clearances. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the clamp body.

[0022] Figure 2 This is a schematic diagram of the regulator assembly.

[0023] Figure 3 This is a schematic diagram of the clamp body.

[0024] Figure 4 yes Figure 1 Top view.

[0025] Figure 5 yes Figure 4 A partial view of the sectional view.

[0026] Figure 6 yes Figure 5 A magnified view of a portion of the image.

[0027] Figure 7 This is a schematic diagram of the overall structure of the adapter adjustment block.

[0028] Figure 8 This is a schematic diagram of the internal structure of the adapter adjustment block.

[0029] Figure 9 This is a schematic diagram of the overall structure of the adjusting sleeve and adjusting screw.

[0030] Figure 10 yes Figure 9 Internal structure diagram.

[0031] The technical names of the reference numerals in the figure are as follows: 1-Adjusting block, 2-Clamp body, 3-Adjusting sleeve, 4-Adjusting screw, 5-Locking screw, 6-First limiting platform, 7-Second limiting platform, 8-First limiting surface, 9-Second limiting surface, 10-Sealing surface, 11-Pressure surface, 12-Threaded connection hole, 13-Boss, 14-First limiting groove, 15-First guide groove, 16-Mounting hole, 17-Second limiting groove, 18-First seal, 19-Second seal, 20-First adjusting hole, 21-Mating cavity, 22-Return spring, 23-Guide post, 24-Sealing groove. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0033] Example 1

[0034] A self-sealing gap-adjusting pneumatic disc brake includes a caliper body 2, a chamber 30 inside the caliper body 2, an adjuster assembly 40 installed inside the chamber 30, a brake block 41 at the lower end of the adjuster assembly 40, the adjuster assembly 40 including a guide shaft 42 that slides with the caliper body 2, and a pressure arm 43 for the movement of the adjuster assembly 40; the adjuster assembly 40 also includes an adjusting sleeve 3 and an adjusting screw 4; the adjuster assembly 40 also includes a base 44, on which a vertical mounting positioning plane 45 is provided, and an assembly surface 46 that mates with the positioning plane 45 is provided on the inner wall of the chamber 30; the mounting positioning plane 45 is provided in all directions around the base 44.

[0035] During operation, by pressing the pressure arm 43, the pressure arm 43 and the seat 44 form a cam structure, thereby pushing the adjuster assembly 40 down to push the brake block 41 to brake.

[0036] The installation positioning plane 45 and the assembly surface 46 ensure that the adjuster assembly 40 can be accurately positioned during installation, which facilitates automated identification and tooling fixture operation.

[0037] It also includes a gap adjustment sealing structure, including an adapter adjustment block 1 and a locking screw 5;

[0038] The adapter adjustment block 1 is located inside the clamp body 2, and has an upper first limiting platform 6 and a lower second limiting platform 7; the clamp body 2 is provided with a first limiting surface 8 for matching with the first limiting platform 6; the adjustment sleeve 3 has a second limiting surface 9 that matches the second limiting platform 7; the clamp body 2 also includes a sealing surface 10, and the adapter adjustment block 1 has a pressing surface 11 that abuts against the sealing surface 10;

[0039] The adapter adjustment block 1 is an integral structure, which not only serves as a seal but also adjusts the gap.

[0040] In this scheme, the gap adjustment mechanism is located inside the clamp body 2. Specifically, the adjustment sleeve 3, the adjustment screw 4, and the adapter adjustment block 1 are all located inside the clamp body 2. The adapter adjustment block 1 also has a central boss 13. The upper part of the boss 13 has a first limiting platform 6, and the lower part of the boss 13 has a second limiting platform 7.

[0041] The clamp body 2 is provided with a first limiting surface 8 for matching with the first limiting platform 6;

[0042] The adjusting sleeve 3 has a second limiting surface 9 that matches the second limiting platform 7;

[0043] The clamp body 2 also includes a sealing surface 10, and the adapter adjustment block 1 has a pressing surface 11 that abuts against the sealing surface 10; in this embodiment, the pressing surface 11 is the upper end surface of the boss 13.

[0044] The upper end face of the adapter adjustment block 1 is provided with an axial threaded connection hole 12; the clamp body 2 is provided with an installation hole 16. When the locking screw 5 is connected and locked with the threaded connection hole 12, the second limiting platform 7 and the second limiting surface 9 do not cooperate to limit the movement, the first limiting platform 6 and the first limiting surface 8 cooperate to limit the movement, and the boss 13 and the sealing surface 10 are sealed to cooperate.

[0045] In this design, the fit between the first limiting platform 6 and the first limiting surface 8, and the fit between the second limiting platform 7 and the second limiting surface 9 are both column-hole fits. Therefore, there are multiple first limiting surfaces 8 and second limiting surfaces 9 to ensure the reliability of the limiting assembly.

[0046] During the adjustment process, the locking screw 5 disengages from the threaded connection hole 12, and the axial movement of the adapter adjustment block 1 causes the first limiting platform 6 and the first limiting surface 8 to disengage from their respective limiting positions. The second limiting platform 7 and the second limiting surface 9 then engage and limit the movement. Rotating the adapter adjustment block 1 causes the adjusting sleeve 3 to rotate, thereby causing the adjusting screw 4, which is threadedly engaged with it, to move axially. Thus, the adapter adjustment block 1 achieves two functions: firstly, it works with the adjusting sleeve 3 to adjust the movement of the adjusting screw 4; secondly, after adjustment, it works with the locking screw 5 to achieve a double-sided seal on the mounting hole 16 of the clamp body 2, resulting in a good sealing effect.

[0047] In this embodiment, the clamp body 2 is provided with a chamber 30. The adapter adjustment block 1, adjustment sleeve 3, and adjustment screw 4 are all disposed in the chamber 30. Below the mounting hole 16, the clamp body 2 is provided with a first limiting groove 14 and a first guide groove 15 in sequence. The side of the first limiting groove 14 is a first limiting surface 8, and the upper end surface of the first guide groove 15 is a sealing surface 10. The upper end surface of the adjustment sleeve 3 is provided with a second limiting groove 17, and the inner side of the second limiting groove 17 is a second limiting surface 9. Specifically, in this embodiment, the cross-sectional shape of the first limiting groove 14 is adapted to the first limiting platform 6, the cross-section of the second limiting groove 17 is adapted to the shape of the second limiting platform 7, and the cross-sectional shape of the first guide groove 15 is adapted to the shape of the boss 13.

[0048] The first limiting platform 6 has a polygonal cross-section, the second limiting platform 7 has a polygonal cross-section, and the boss 13 has a circular cross-section. Specifically, both the first limiting platform 6 and the second limiting platform 7 have hexagonal or octagonal cross-sections. The purpose of the circular boss 13 is to ensure that the movement of the second limiting platform 7 and the second limiting surface 9 after they are engaged is not affected by the first guide groove 15 of the clamp body 2. On the other hand, it can be used to guide the adapter adjustment block 1 during axial movement and to maintain its positioning during circumferential rotation, preventing the adjustment sleeve 3 from getting stuck or tilting, and also preventing the adapter adjustment block 1 from being difficult to straighten after it has shifted.

[0049] A first seal 18 is provided between the limiting screw and the clamp body 2, and / or a second seal 19 is provided between the sealing surface 10 and the boss 13. Specifically, in this embodiment, both the first seal 18 and the second seal 19 are provided, and both the first seal 18 and the second seal 19 are O-rings, with grooves for assembling the O-rings provided on the corresponding sealing surface 10.

[0050] In this embodiment, for ease of operation, a first adjustment hole 20 and a threaded connection hole 12 are sequentially arranged from top to bottom on the upper end face of the adapter adjustment block 1. The diameter of the first adjustment hole 20 is larger than that of the threaded connection hole 12, and the threaded connection hole 12 is located on the bottom surface of the first adjustment hole 20. The function of the first adjustment hole 20 is to cooperate with external operating tools for easy operation and adjustment. At the same time, the threaded connection hole 12 is used to cooperate with the locking screw 5. When the locking screw 5 and the threaded connection hole 12 are engaged, the first limiting platform 6 is restricted by the first limiting surface 8 and cannot rotate. Therefore, the locking screw 5 will pull the adapter adjustment block 1 to move axially towards the inner wall of the clamp body 2, thereby realizing the function of double-sided locking of the screw and the adapter adjustment block 1.

[0051] In a further optimized embodiment, a guide post 23 is provided on the lower end face of the second limiting platform 7. The guide post 23 is used to facilitate the axial movement of the adjusting block 1.

[0052] The specific adjustment process of the adjusting screw 4 is as follows: the upper end of the adjusting sleeve 3 is connected to the mating cavity 21 of the adjusting sleeve 3. The mating cavity 21 is provided with an internal thread, and the adjusting screw 4 and the mating cavity 21 are threadedly connected. This kind of threaded engagement to convert rotation into linear motion is quite common. Specifically, the adjusting screw is limited in the circumferential direction to prevent it from rotating. While the adjusting sleeve rotates, the adjusting screw achieves axial linear motion through the internal thread engagement, thus completing the adjustment.

[0053] In the initial state:

[0054] The locking screw 5 is connected to the threaded connection hole 12 and locked on the outside and inside of the mounting hole 16. Further sealing is achieved through the first seal 18 and the second seal 19.

[0055] When it is necessary to adjust the intervals after working for a certain period of time:

[0056] Release the locking screw 5 from the threaded connection hole 12, and push the adapter adjustment block 1 axially to make the second limiting platform 7 and the second limiting groove 17 engage. The operating tool engages in the first adjustment hole 20. Rotate the adapter adjustment block 1 to drive the adjustment sleeve 3 to rotate synchronously. While the adjustment sleeve 3 rotates synchronously, the adjustment screw 4 is restricted in the circumferential direction. Therefore, under the condition of internal thread engagement, the axial movement of the adjustment screw 4 drives the brake block 41 to move to achieve gap adjustment.

[0057] After the gap adjustment is completed:

[0058] Disengage the adapter adjustment block 1 from the second limiting groove 17, and connect it to the locking screw 5 through the threaded connection hole 12. After the first limiting groove 14 limits the first limiting platform 6, rotate the locking screw 5 to firmly press the adapter adjustment block 1 against the inner wall of the clamp body 2, thereby achieving an internal and external seal of the mounting hole 16.

[0059] This new structure fundamentally solves the problem of seal failure caused by rubber aging by improving the sealing method. Structurally, the self-locking clamping force of the sealing screw and adapter adjustment block 1, combined with the O-ring, greatly improves the sealing reliability. From a production perspective, this structure helps improve the product assembly qualification rate. From an after-sales maintenance perspective, this structure improves the convenience of maintenance and reduces the probability of parts being damaged during maintenance. From a product compatibility perspective, the built-in adjustment block reduces the product's installation space requirements and improves its versatility. From a product functional reliability perspective, this structure effectively prevents seizing or braking gaps caused by large adjustment thread clearances.

[0060] Example 2

[0061] It also includes a return spring 22, the upper end of which engages with the guide post 23 for limiting, and the lower end abuts against the adjusting screw 4 inside the mating cavity 21. Obviously, the bottom surface of the second limiting groove 17 extends through the mating cavity 21. In its natural state, the return spring 22 can push the adapter adjusting block 1 against the first limiting platform 6 and the first limiting surface 8 for limiting, while the second limiting platform 7 and the second limiting surface 9 disengage from the limiting position.

[0062] When adjusting the gap, apply a certain axial pressure to push the adapter adjustment block 1 into the second limiting groove 17 for gap adjustment. After the adjustment is completed, remove the external force. Under the action of the return spring 22, the adapter adjustment block 1 automatically moves upward and disengages from the limiting engagement with the second limiting groove 17, thereby achieving the limiting engagement with the first limiting groove 14, which facilitates the installation of locking and fixing.

[0063] Moreover, the return spring 22 of this structural design is always under pressure when the locking screw 5 is locked, thereby giving the adjusting screw a certain thrust to overcome the gap in the threaded fit between the adjusting screw and the adjusting sleeve 3, avoiding the failure of the adjustment due to shaking and vibration and large gap, and extending its service life.

[0064] Example 3

[0065] The difference from Embodiment 1 and Embodiment 2 is that the boss 13 and the first guide groove 15 structure are omitted, and the pressing surface 11 is the upper end surface of the first limiting platform 6.

[0066] Example 4

[0067] The difference between this embodiment and embodiment 1 is that the boss 13 is formed by multiple circumferentially arranged frustums, including a small frustum near the first limiting platform and a large frustum near the second limiting platform, and the first guide groove 15 is adapted to the above shape.

Claims

1. A self-sealing gap-adjusting pneumatic disc brake, characterized in that: Includes a clamp body (2), a chamber (30) is provided inside the clamp body (2), an adjuster assembly (40) is installed inside the chamber (30), a brake block (41) is provided at the lower end of the adjuster assembly (40), the adjuster assembly (40) includes a guide shaft (42) that slides with the clamp body (2), and a pressure arm (43) for the movement of the adjuster assembly (40); The regulator assembly (40) also includes an adjustment sleeve (3) and an adjustment screw (4); It also includes a gap adjustment sealing structure, including a transition adjustment block (1) and a locking screw (5). The adapter adjustment block (1) is located inside the clamp body (2), and it has an upper first limiting platform (6) and a lower second limiting platform (7); the clamp body (2) is provided with a first limiting surface (8) for matching with the first limiting platform (6); the adjustment sleeve (3) has a second limiting surface (9) for matching with the second limiting platform (7); the clamp body (2) also includes a sealing surface (10), and the adapter adjustment block (1) has a pressing surface (11) that abuts against the sealing surface (10). The upper end face of the adapter adjustment block (1) is provided with an axial threaded connection hole (12); when the locking screw (5) is connected and locked to the threaded connection hole (12), the locking screw (5) is locked on the upper side of the clamp body (2), the adapter adjustment block (1) is locked on the lower side of the clamp body (2), the second limiting platform (7) and the second limiting surface (9) do not cooperate to limit, the first limiting platform (6) and the first limiting surface (8) cooperate to limit, and the pressing surface (11) and the sealing surface (10) are sealed to cooperate; During the adjustment process, the locking screw (5) and the threaded connection hole (12) are disengaged. The axial movement of the adapter adjustment block (1) causes the first limiting platform (6) and the first limiting surface (8) to disengage from the matching limit. The second limiting platform (7) and the second limiting surface (9) are matched and limited. Rotating the adapter adjustment block (1) drives the adjustment sleeve (3) to rotate, thereby driving the adjustment screw (4) that is threadedly matched with it to move axially.

2. The pneumatic disc brake with self-sealing gap adjustment according to claim 1, characterized in that: The clamp body (2) is provided with a chamber (30), and the adapter adjustment block (1), adjustment sleeve (3) and adjustment screw (4) are all provided in the chamber (30). The clamp body (2) is provided with a first limiting groove (14), which is connected to the upper side of the clamp body (2). The side of the first limiting groove (14) is the first limiting surface (8). The upper end face of the adjustment sleeve (3) is provided with a second limiting groove (17), and the inner side of the second limiting groove (17) is the second limiting surface (9). The first limiting platform (6) has a polygonal cross section, the second limiting platform (7) has a polygonal cross section, and also includes a first limiting groove (14) forming the first limiting surface (8). The first limiting groove (14) penetrates the upper end face of the clamp body (2) to form a mounting hole (16) for inserting the locking screw (5).

3. A pneumatic disc brake with self-sealing gap adjustment according to claim 1, characterized in that: The adjuster assembly (40) also includes a base (44), on which a vertical mounting positioning plane (45) is provided, and an assembly surface (46) that mates with the positioning plane (45) is provided on the inner wall of the chamber (30); the mounting positioning plane (45) is provided in all directions around the base (44).

4. A self-sealing gap-adjusting pneumatic disc brake according to claim 1, characterized in that: It also includes a boss (13) located between the first limiting platform (6) and the second limiting platform (7). The upper end face of the boss (13) is a pressing surface (11). The clamp body (2) is provided with a first guide groove (15) below the mounting hole (16). The cross-section of the boss (13) is circular. The shapes of the boss (13) and the first guide groove (15) are compatible. The upper end face of the first guide groove (15) is a sealing surface (10).

5. A self-sealing gap-adjusting pneumatic disc brake according to claim 1, 2, 3, or 4, characterized in that: A first seal (18) is provided between the limiting screw and the clamp body (2), and / or a second seal (19) is provided between the sealing surface (10) and the pressing surface (11).

6. A self-sealing gap-adjusting pneumatic disc brake according to claim 1, 2, 3, or 4, characterized in that: The upper end face of the adapter adjustment block (1) is provided with a first adjustment hole (20) and a threaded connection hole (12) from top to bottom. The diameter of the first adjustment hole (20) is larger than that of the threaded connection hole (12). The threaded connection hole (12) is located on the bottom surface of the first adjustment hole (20).

7. A self-sealing gap-adjusting pneumatic disc brake according to claim 1, 2, 3, or 4, characterized in that: The lower end face of the second limiting platform (7) is provided with a guide post (23).

8. A self-sealing gap-adjusting pneumatic disc brake according to claim 1, 2, 3, or 4, characterized in that: The upper end of the adjusting sleeve (3) is connected to the mating cavity (21) of the adjusting sleeve (3). The mating cavity (21) is provided with an internal thread. The adjusting screw (4) is threadedly connected to the mating cavity (21). It also includes a return spring (22). The upper end of the return spring (22) abuts against the adapter adjusting block (1), and the lower end abuts against the adjusting screw (4) in the mating cavity (21).

9. A self-sealing gap-adjusting pneumatic disc brake according to claim 6, characterized in that: In its initial state, the return spring (22) always pushes the adapter adjustment block (1) to the upper region, where the first limiting platform (6) and the first limiting surface (8) cooperate to limit the movement, and the second limiting platform (7) disengages from the limiting cooperation of the second limiting surface (9).

10. A pneumatic disc brake with self-sealing gap adjustment according to claim 5, characterized in that: A sealing groove is provided on the sealing surface (10) or the pressing surface (11), and the second sealing element (19) is an O-ring assembled in the sealing groove.

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