Brake torque adjusting mechanism of disc brake

Abstract

The utility model relates to a brake torque adjusting mechanism of a disc brake. The technical problem that an existing brake cannot conduct semi-braking is solved. Comprising a brake shell and a transmission shaft rotationally arranged in the brake shell, the transmission shaft is sleeved with a friction plate assembly, a piston body is arranged on the inner side of the brake shell in the circumferential direction, the piston body is of a split structure, and the piston body is provided with a small piston and a large piston abutting against the small piston. A first braking jacking assembly is arranged at the end, away from the small piston, of the large piston, a second braking jacking assembly is arranged at the end, away from the large piston, of the small piston, and a first oil way assembly and a second oil way assembly are arranged in the brake shell. The transmission shaft has the advantages that the first oil way assembly can keep the large piston away from the friction plate assembly, and the transmission effect of the transmission shaft is guaranteed. The second oil way assembly can enable the small piston to overcome the pressure of the second braking jacking assembly, so that the friction plate assembly brakes and decelerates the transmission shaft, the rotating speed of the transmission shaft is reduced, and the deceleration effect is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of brake equipment, and particularly relates to a braking torque adjusting mechanism of a disc brake. BACKGROUND

[0002] The existing wheel loader needs to brake the wheels in real time during loading movement to cope with different road conditions and prevent accidents caused by excessive speed; however, the existing wheel loader is large in size and heavy in load, and is high in requirement for the brake, and the existing brake is insufficient in braking force and cannot effectively brake the wheel loader, affecting the use safety of the wheel loader, and the brake used in the existing wheel loader cannot adjust the speed of the wheel loader in real time to ensure braking effect, affecting the user experience and the use safety of the wheel loader.

[0003] In order to solve the problems in the prior art, people have carried out long-term exploration and proposed various solutions. For example, the Chinese patent document discloses a parking brake and loader [201920755404.X], which comprises a brake shaft, a shell is sleeved on the brake shaft, a brake pad and a friction plate are arranged between the brake shaft and the shell and cooperate with each other, the brake pad is coaxially installed on the brake shaft, the friction plate is installed on the shell, a piston is further sleeved on the brake shaft, and the piston is used to push the friction plate to clamp the brake pad.

[0004] The above-mentioned scheme solves the problem of insufficient braking force of the existing loader brake to some extent, but the scheme still has many deficiencies, for example, the brake cannot maintain a half-braking state, and the speed of the wheel loader cannot be adjusted, affecting the user experience. SUMMARY

[0005] The utility model aims at the above-mentioned problem and provides a braking torque adjusting mechanism of a disc brake.

[0006] In order to achieve the above object, the utility model discloses the following technical scheme: a kind of piece brake brake torque adjusting mechanism, including brake shell and transmission shaft rotationally arranged in brake shell, the transmission shaft is equipped with friction plate assembly that can be linked with transmission shaft, piston body is arranged on the circumferential inner side of brake shell, the piston body is split structure, the piston body has small piston at one end of friction plate assembly and large piston being arranged at the end of small piston away from friction plate assembly and abutting against small piston, the end of large piston away from small piston and brake shell is equipped with first brake pressing assembly, and the end of small piston away from large piston and brake shell is equipped with second brake pressing assembly, first oil circuit assembly that can drive large piston to overcome the force of first brake pressing assembly and move towards the direction away from friction plate assembly and second oil circuit assembly that can drive small piston to overcome the force of second brake pressing assembly and move towards friction plate assembly are arranged in brake shell, the pressure of second brake pressing assembly is overcome by first brake pressing assembly to push piston body and make piston body press friction plate assembly, guarantee the brake effect of friction plate assembly to transmission shaft, and large piston is driven away from friction plate assembly by first oil circuit assembly, so that friction plate assembly loses pressure and releases brake, and small piston is pushed towards friction plate assembly and displaced by second oil circuit assembly, so that friction plate assembly is contacted with transmission shaft, so that the speed of transmission shaft is reduced, guaranteeing the effect of deceleration.

[0007] In the piece brake brake torque adjusting mechanism, the friction plate assembly includes a plurality of dynamic friction plates and static friction plates respectively sleeved on the transmission shaft, the dynamic friction plates and static friction plates are arranged in an alternating staggered manner, the static friction plates are positioned circumferentially and slide axially on the transmission shaft through the spline tooth structure, and a certain sliding friction braking torque is generated when the static friction plates and dynamic friction plates are pressed tightly, the spline tooth structure can brake and decelerate the transmission shaft, and the effect of deceleration is guaranteed.

[0008] In the piece brake brake torque adjusting mechanism, the transmission shaft is rotationally arranged on the circumferential inner side of one end of the brake shell through a bearing, and the brake shell is coaxially arranged with the transmission shaft, and the transmission effect of the transmission shaft in the brake shell is guaranteed through the bearing.

[0009] In the above-mentioned brake torque adjusting mechanism of the disc brake, the large piston and the small piston are both in a cylindrical shape, the large piston is slidingly arranged on the inner side of the brake shell in the circumferential direction, and the small piston is movably arranged on the inner side of the large piston in the circumferential direction, the end of the large piston away from the small piston is provided with a large piston ring extending outwardly to the inner side of the open end of the brake shell and abutting against the first brake pressing assembly, the other end of the small piston is provided with a small piston ring extending outwardly to the outer side of the end of the large piston and abutting against the friction plate assembly, and the small piston ring abuts against the second brake pressing assembly, the contact area with the first brake pressing assembly can be increased by the large piston ring, the pushing effect of the first brake pressing assembly on the large piston ring is ensured, the small piston can abut against the friction plate assembly by the small piston ring, the small piston can easily apply pressure to the friction plate assembly, and the braking effect of the friction plate assembly is ensured.

[0010] In the above-mentioned brake torque adjusting mechanism of the disc brake, two large piston sealing members are arranged between the outer side of the large piston in the circumferential direction and the inner side of the brake shell in the circumferential direction, two small piston sealing members are arranged between the outer side of the small piston in the circumferential direction and the inner side of the large piston in the circumferential direction, and a large piston ring sealing member is arranged between the outer side of the large piston ring in the circumferential direction and the inner side of the open end of the brake shell in the circumferential direction, the sealing effect between the large piston and the brake shell is ensured by the large piston sealing members, the oil cavity pressure is ensured, the sealing effect between the small piston and the large piston is ensured by the small piston sealing members, and the oil pressure thrust is ensured.

[0011] In the above-mentioned brake torque adjusting mechanism of the disc brake, the first oil path assembly comprises a first oil path arranged in the brake shell, one end of the first oil path is in communication with a first oil port arranged on the brake shell, and the other end of the first oil path is in communication with a first annular oil cavity located at the end of the large piston ring away from the first brake pressing assembly, the first annular oil cavity is located between the large piston ring sealing member and the large piston sealing member, oil enters the first annular oil cavity through the first oil path, and the pressure oil in the first annular oil cavity applies pressure to the large piston away from the friction plate assembly, so that the friction plate assembly is released from braking the transmission shaft, and the sealing effect is ensured by the large piston ring sealing member and the large piston sealing member, and the oil pressure in the first annular oil cavity is ensured.

[0012] In the brake torque adjusting mechanism of the above-mentioned disc brake, the second oil passage assembly comprises a second oil passage arranged in the brake housing, one end of the first oil passage is communicated with the second oil port arranged on the brake housing, and the other end of the first oil passage is communicated with an annular connecting cavity located on the outer periphery of the large piston and the inner periphery of the brake housing, the annular connecting cavity is located between two large piston ring seals, the outer periphery of the small piston is provided with an annular step located on the inner periphery of the large piston, one side of the annular step is provided with a small piston pushing oil cavity, the small piston pushing oil cavity is communicated with the annular connecting cavity through a communication oil passage penetrating the large piston, and the small piston pushing oil cavity is located between two small piston seals, the second oil port enters oil through the second oil passage to flow into the annular connecting cavity, the small piston pushing oil cavity is communicated with the annular connecting cavity through the connecting oil passage, and the annular connecting cavity and the small piston pushing oil cavity can apply a pushing force to the small piston towards the friction plate assembly, so that the friction plate assembly brakes and slows down the transmission shaft, and the slowing effect is ensured.

[0013] In the brake torque adjusting mechanism of the above-mentioned disc brake, the open end of the brake housing is provided with a cover plate, one end of the cover plate is inserted into the inner side of the open end of the brake housing, and a cover plate seal is arranged between the cover plate and the open end of the brake housing, the cover plate can support the first brake pressing assembly, and the cover plate seal can ensure the sealing effect between the cover plate and the brake housing.

[0014] In the brake torque adjusting mechanism of the above-mentioned disc brake, the first brake pressing assembly comprises a plurality of first brake springs arranged in a circumferential direction, the first brake springs are arranged in spring holders respectively, one end of each first brake spring acts on the cover plate, and the other end acts on the large piston ring, and a compression gap is formed between one end of the spring holder and the cover plate, the spring holder can facilitate positioning and installation of the first brake spring, the compression gap can facilitate extension and contraction of the first brake spring, and the first brake spring can apply a pushing force to the large piston ring to displace the large piston towards the friction plate assembly, so that the braking effect in the braking state is ensured.

[0015] In the brake torque adjusting mechanism of the above-mentioned disc brake, the second brake pressing assembly comprises a spring mounting groove arranged on the inner periphery of the brake housing and located on the outer periphery of the friction plate assembly, a plurality of second brake springs are arranged in the spring mounting groove, one end of each second brake spring acts in the spring mounting groove, and the other end acts on the small piston ring, the spring mounting groove can facilitate installation and placement of the second brake spring, and the second brake spring can apply a pushing force to the small piston ring away from the friction plate assembly.

[0016] Compared with the prior art, the brake torque adjusting mechanism of the disc brake has the advantages that:

[0017] 1、Through the first brake top pressure assembly, the pressure of the second brake top pressure assembly can be overcome, the pressure of the piston body on the friction plate assembly is ensured, the braking force of the friction plate assembly on the transmission shaft is ensured, and the braking effect is ensured.

[0018] 2、Through the first oil way assembly, the large piston can be away from the friction plate assembly, and through the second brake top pressure assembly, the small piston can be away from the friction plate assembly, so that the friction plate assembly cancels the braking on the transmission shaft, and the transmission effect of the transmission shaft is ensured.

[0019] 3、Through the second oil way assembly, the small piston can overcome the pressure of the second brake top pressure assembly, so that the friction plate assembly brakes and slows down the transmission shaft, the rotation speed of the transmission shaft is reduced, and the slowing effect is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic view of the utility model.

[0021] Figure 2 is Figure 1 the structure schematic view of the local amplification in A place of

[0022] Figure 3 is the structural explosion drawing of the utility model.

[0023] In the drawing: brake shell 1, transmission shaft 11, bearing 12, open end 13, cover plate 14, cover plate sealing element 15, friction plate assembly 2, dynamic friction plate 21, static friction plate 22, piston body 3, small piston 31, small piston ring 311, small piston sealing element 312, large piston 32, large piston ring 321, large piston sealing element 322, large piston ring sealing element 323, first brake top pressure assembly 4, first brake spring 41, spring retainer 42, compression gap 43, second brake top pressure assembly 5, spring mounting groove 51, second brake spring 52, first oil way assembly 6, first oil way 61, first oil port 62, first annular oil cavity 63, second oil way assembly 7, second oil way 71, second oil port 72, annular connecting cavity 73, annular step 74, small piston pushing oil cavity 75, communication oil way 76, spline tooth structure 8. DETAILED DESCRIPTION

[0024] The utility model will be further explained in detail in combination with the drawings and specific embodiments.

[0025] As Figure 1 , Figure 3As shown, the brake torque adjusting mechanism of the present application comprises a brake shell 1, a transmission shaft 11 rotatably arranged in the brake shell 1, a friction plate assembly 2 arranged on the transmission shaft 11 and capable of generating braking force on the transmission shaft 11 during transmission to ensure braking effect, a piston body 3 arranged on the inner side of the brake shell 1 in the circumferential direction, the piston body 3 being of split structure and comprising a small piston 31 arranged at one end of the friction plate assembly 2 and a large piston 32 arranged at the end of the small piston 31 away from the friction plate assembly 2 and abutting against the small piston 31, a first brake pressing assembly 4 arranged between the end of the large piston 32 away from the small piston 31 and the brake shell 1, and a second brake pressing assembly 5 arranged between the end of the small piston 31 away from the large piston 32 and the brake shell 1, a first oil path assembly 6 arranged in the brake shell 1 and capable of driving the large piston 32 to move towards the end away from the friction plate assembly 2 against the force of the first brake pressing assembly 4, and a second oil path assembly 7 arranged in the brake shell 1 and capable of driving the small piston 31 to move towards the friction plate assembly 2 against the force of the second brake pressing assembly 5, the first brake pressing assembly 4 being capable of pushing the piston body 3 to press the friction plate assembly 2 against the pressure of the second brake pressing assembly 5 to ensure the braking effect of the friction plate assembly 2 on the transmission shaft 11, the first oil path assembly 6 being capable of driving the large piston 32 to move away from the friction plate assembly 2 to release the pressure of the friction plate assembly 2 to release braking, and the second oil path assembly 7 being capable of pushing the small piston 31 to move towards the friction plate assembly 2 to make the friction plate assembly 2 contact the transmission shaft 11 to reduce the speed of the transmission shaft 11 and ensure the speed reduction effect.

[0026] Specifically, the friction plate assembly 2 comprises a plurality of dynamic friction plates 21 and static friction plates 22 arranged on the transmission shaft 11, the dynamic friction plates 21 and the static friction plates 22 are arranged in an alternating manner and the static friction plates 22 are positioned in the circumferential direction and axially slide on the transmission shaft 11 through the spline tooth structure 8, the static friction plates 22 and the dynamic friction plates 21 generate certain sliding friction braking torque when pressed, and the spline tooth structure 8 is capable of braking and reducing the speed of the transmission shaft 11 to ensure the speed reduction effect.

[0027] The transmission shaft 11 is rotatably arranged on the inner side of one end of the brake shell 1 through the bearing 12, and the brake shell 1 is coaxially arranged with the transmission shaft 11, and the bearing 12 is capable of ensuring the transmission effect of the transmission shaft 11 in the brake shell 1.

[0028] As shown in the drawings, Figure 1 , Figure 3As shown, the large piston 32 and the small piston 31 are both in a cylindrical shape, the large piston 32 is slidingly arranged on the inner side of the brake housing 1 in the circumferential direction, and the small piston 31 is movably arranged on the inner side of the large piston 32 in the circumferential direction, the end of the large piston 32 away from the small piston 31 is provided with a large piston ring 321 extending outwardly to the inner side of the open end of the brake housing 1 and abutting against the first brake pressing assembly 4, and the other end of the small piston 31 is provided with a small piston ring 311 extending outwardly to the outer side of the end of the large piston 32 and abutting against the friction plate assembly 2, the small piston ring 311 abutting against the second brake pressing assembly 5, the contact area with the first brake pressing assembly 4 can be increased through the large piston ring 321, and the pushing effect of the first brake pressing assembly 4 on the large piston ring 321 is ensured, and the small piston 31 can be controlled to abut against the friction plate assembly 2 through the small piston ring 311, the small piston 31 can easily apply pressure to the friction plate assembly 2, and the braking effect of the friction plate assembly 2 is ensured.

[0029] Further, two large piston sealing members 322 are arranged between the outer side of the large piston 32 in the circumferential direction and the inner side of the brake housing 1 in the circumferential direction, two small piston sealing members 312 are arranged between the outer side of the small piston 31 in the circumferential direction and the inner side of the large piston 32 in the circumferential direction, and a large piston ring sealing member 323 is arranged between the outer side of the large piston ring 321 in the circumferential direction and the inner side of the open end 13 of the brake housing 1 in the circumferential direction, the sealing effect between the large piston 32 and the brake housing 1 can be ensured through the large piston sealing members 322, the oil cavity pressure is ensured, and the sealing effect between the small piston 31 and the large piston 32 can be ensured through the small piston sealing members 312, and the oil pressure thrust is ensured.

[0030] The first oil path assembly 6 comprises a first oil path 61 arranged in the brake housing 1, one end of the first oil path 61 is in communication with a first oil port 62 arranged on the brake housing 1, and the other end of the first oil path 61 is in communication with a first annular oil cavity 63 located at the end of the large piston ring 321 away from the first brake pressing assembly 4, the first annular oil cavity 63 is located between the large piston ring sealing member 323 and the large piston sealing member 322, the oil inlet of the first oil port 62 flows to the first annular oil cavity 63 through the first oil path 61, and the pressure oil in the first annular oil cavity 63 applies pressure to the large piston 32 away from the friction plate assembly 2, so that the friction plate assembly 2 is released from the brake of the transmission shaft 11, and the sealing effect is ensured through the large piston ring sealing member 323 and the large piston sealing member 322, and the oil pressure in the first annular oil cavity 63 is ensured.

[0031] In combination Figure 1 , Figure 2 , Figure 3As shown, the second oil passage assembly 7 comprises a second oil passage 71 arranged in the brake housing 1, one end of the first oil passage 61 communicates with a second oil port 72 arranged on the brake housing 1, and the other end of the first oil passage 61 communicates with an annular connecting cavity 73 located on the outer side of the brake housing 1 and the inner side of the brake housing 1. The annular connecting cavity 73 is located between two large piston ring seals 323, which can ensure the sealing effect of the annular connecting cavity 73 and ensure the oil pressure in the annular connecting cavity 73. The outer side of the small piston 31 has an annular step 74 located on the inner side of the large piston 32, and one side of the annular step 74 is provided with a small piston pushing oil cavity 75. The small piston pushing oil cavity 75 communicates with the annular connecting cavity 73 through a communication oil passage 76 penetrating the large piston 32, and the small piston pushing oil cavity 75 is located between two small piston seals 312. The second oil port 72 enters oil through the second oil passage 71 into the annular connecting cavity 73, and the small piston pushing oil cavity 75 is connected with the annular connecting cavity 73 through the connecting oil passage 76. The annular connecting cavity 73 and the small piston pushing oil cavity 75 can exert a pushing force on the small piston 31 towards the friction plate assembly 2, so that the friction plate assembly 2 brakes and slows down the transmission shaft 11, ensuring the deceleration effect.

[0032] The open end 13 of the brake housing 1 is provided with a cover plate 14, one end of the cover plate 14 is inserted into the inner side of the open end 13 of the brake housing 1, and the cover plate 14 and the open end 13 of the brake housing 1 are provided with a cover plate seal 15. The first brake top pressing assembly 4 can be supported by the cover plate 14, and the sealing effect between the cover plate 14 and the brake housing 1 can be ensured by the cover plate seal 15.

[0033] Specifically, the first brake top pressing assembly 4 comprises a plurality of first brake springs 41 arranged in a circumferential direction, the first brake springs 41 are arranged in the spring retainer 42, one end of the first brake spring 41 acts on the cover plate 14 and the other end acts on the large piston ring 321, and the spring retainer 42 has a compression gap 43 between one end and the cover plate 14. The spring retainer 42 can facilitate positioning and installation of the first brake spring 41, and the compression gap 43 can facilitate extension and retraction of the first brake spring 41. The first brake spring 41 can exert a pushing force on the large piston ring 321 to displace the large piston 32 towards the friction plate assembly 2, ensuring the braking effect in the braking state.

[0034] In combination Figure 1 , Figure 3As shown, the second brake top pressing assembly 5 comprises a spring mounting groove 51 arranged on the inner side of the brake shell 1 and located on the peripheral side of the friction plate assembly 2, a plurality of second brake springs 52 are arranged in the spring mounting groove 51, one end of the second brake spring 52 is arranged in the spring mounting groove 51 and the other end is arranged on the small piston ring 311, the spring mounting groove 51 can facilitate the installation of the second brake spring 52, and the second brake spring 52 can apply a pushing force to the small piston ring 311 away from the friction plate assembly 2.

[0035] The principle of the embodiment is that when the vehicle needs to maintain the braking state, the first oil way assembly 6 and the second oil way assembly 7 do not enter oil, and the large piston 32 pushes the small piston 32 to apply pressure to the friction plate assembly 2 by overcoming the pressure of the second brake top pressing assembly 5 through the first brake top pressing assembly 4, the friction plate assembly 2 applies pressure to the transmission shaft 11 through the spline tooth structure 8, so that the transmission shaft 11 stops rotating with the brake shell 1, and the braking effect is guaranteed; when the vehicle needs to maintain the driving state, the first oil way assembly 6 enters oil, the large piston 32 is displaced away from the friction plate assembly 2 under the oil pressure, and the small piston 31 is reversely displaced away from the friction plate assembly 2 through the second brake top pressing assembly 5, the friction plate assembly 2 is not under pressure and is free to spread, and the transmission shaft 11 is not under braking force, ensuring the transmission effect; when the vehicle needs to ensure the deceleration half-braking state, the first oil way assembly 6 enters oil at the same time, the second oil way assembly 7 also enters oil, the position of the large piston 32 does not change, the small piston 31 is displaced towards the friction plate assembly 2 under the control of the second oil way assembly 7, and applies pressure to the friction plate assembly 2, and the friction plate assembly 2 generates a certain sliding friction braking torque, which is transmitted through the spline tooth structure 8, so that the rotation speed of the transmission shaft 11 is reduced, and the deceleration effect is guaranteed.

[0036] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

[0037] Although the terms brake shell 1, transmission shaft 11, bearing 12, open end 13, cover plate 14, cover plate seal 15, friction plate assembly 2, dynamic friction plate 21, static friction plate 22, piston body 3, small piston 31, small piston ring 311, small piston seal 312, large piston 32, large piston ring 321, large piston seal 322, large piston ring seal 323, first brake pressing assembly 4, first brake spring 41, spring retainer 42, compression gap 43, second brake pressing assembly 5, spring mounting groove 51, second brake spring 52, first oil passage assembly 6, first oil passage 61, first oil port 62, first annular oil cavity 63, second oil passage assembly 7, second oil passage 71, second oil port 72, annular connecting cavity 73, annular step 74, small piston pushing oil cavity 75, communication oil passage 76, spline tooth structure 8 are used more frequently in the text, but the possibility of using other terms is not excluded. The use of these terms is only to facilitate the description and explanation of the essence of the utility model; any additional limitation is contrary to the spirit of the utility model.

Claims

1. A brake torque adjustment mechanism for a disc brake, comprising a brake housing (1) and a transmission shaft (11) rotatably disposed within the brake housing (1), wherein a friction disc assembly (2) capable of linkage with the transmission shaft (11) is sleeved on the transmission shaft (11), and a piston body (3) is provided on the inner circumferential side of the brake housing (1), characterized in that, The piston body (3) is a split structure. The piston body (3) has a small piston (31) located at one end of the friction plate assembly (2) and a large piston (32) located at the end of the small piston (31) away from the friction plate assembly (2) and abutting against the small piston (31). A first brake pressing assembly (4) is provided between the end of the large piston (32) away from the small piston (31) and the brake housing (1). A second brake pressing assembly (5) is provided between the end of the small piston (31) away from the large piston (32) and the brake housing (1). A first oil circuit assembly (6) is provided in the brake housing (1) to drive the large piston (32) to overcome the force of the first brake pressing assembly (4) and move in a direction away from the friction plate assembly (2). A second oil circuit assembly (7) is provided to drive the small piston (31) to overcome the force of the second brake pressing assembly (5) and move in a direction towards the friction plate assembly (2).

2. The brake torque adjustment mechanism for a disc brake according to claim 1, characterized in that, The friction plate assembly (2) includes several dynamic friction plates (21) and static friction plates (22) respectively sleeved on the transmission shaft (11). The dynamic friction plates (21) and static friction plates (22) are arranged alternately, and the static friction plates (22) are circumferentially positioned with the transmission shaft (11) and axially sliding through the spline structure (8).

3. The brake torque adjustment mechanism for a disc brake according to claim 1, characterized in that, The drive shaft (11) is rotatably mounted on the inner side of one end of the brake housing (1) via a bearing (12), and the brake housing (1) and the drive shaft (11) are coaxially mounted.

4. A disc brake torque adjustment mechanism according to claim 1, 2, or 3, characterized in that, Both the large piston (32) and the small piston (31) are cylindrical. The large piston (32) is slidably disposed on the inner side of the brake housing (1) and one end of the small piston (31) is movably disposed on the inner side of the large piston (32). The end of the large piston (32) away from the small piston (31) has a large piston ring (321) that extends outward to the inner side of the opening at one end of the brake housing (1) and abuts against the first brake pressure assembly (4). The other end of the small piston (31) has a small piston ring (311) that extends outward to the outer side of the end of the large piston (32) and abuts against the friction plate assembly (2). The small piston ring (311) abuts against the second brake pressure assembly (5).

5. The disc brake torque adjustment mechanism according to claim 4, characterized in that, Two large piston seals (322) are provided between the outer circumferential side of the large piston (32) and the inner circumferential side of the brake housing (1), and two small piston seals (312) are provided between the outer circumferential side of the small piston (31) and the inner circumferential side of the large piston (32), and a large piston ring seal (323) is provided between the outer circumferential side of the large piston ring (321) and the inner circumferential side of the open end (13) of the brake housing (1).

6. The disc brake torque adjustment mechanism according to claim 5, characterized in that, The first oil circuit assembly (6) includes a first oil circuit (61) disposed in the brake housing (1). One end of the first oil circuit (61) is connected to a first oil port (62) disposed on the brake housing (1), and the other end of the first oil circuit (61) is connected to a first annular oil cavity (63) located at the end of the large piston ring (321) away from the first brake pressure assembly (4). The first annular oil cavity (63) is located between the large piston ring seal (323) and the large piston seal (322).

7. The brake torque adjustment mechanism for a disc brake according to claim 5, characterized in that, The second oil circuit assembly (7) includes a second oil circuit (71) disposed in the brake housing (1). One end of the first oil circuit (61) is connected to a second oil port (72) disposed on the brake housing (1), and the other end of the first oil circuit (61) is connected to an annular connecting cavity (73) located on the outer circumferential side of the large piston (32) and the inner circumferential side of the brake housing (1). The annular connecting cavity (73) is located between two large piston ring seals (323). The outer circumferential side of the small piston (31) has an annular step (74) located on the inner circumferential side of the large piston (32), and a small piston pushing oil chamber (75) is provided on one side of the annular step (74). The small piston pushing oil chamber (75) is connected to the annular connecting cavity (73) through a connecting oil circuit (76) penetrating the large piston (32), and the small piston pushing oil chamber (75) is located between two small piston seals (312).

8. The braking torque adjustment mechanism for a disc brake according to claim 4, characterized in that, The open end (13) of the brake housing (1) is provided with a cover plate (14), one end of the cover plate (14) is inserted into the inside of the open end (13) of the brake housing (1), and a cover plate seal (15) is provided between the cover plate (14) and the open end (13) of the brake housing (1).

9. The braking torque adjustment mechanism for a disc brake according to claim 8, characterized in that, The first braking pressure assembly (4) includes several circumferentially distributed first braking springs (41), which are respectively disposed in the spring retainer (42). One end of the first braking spring (41) acts on the cover plate (14) and the other end acts on the large piston ring (321). There is a compression gap (43) between one end of the spring retainer (42) and the cover plate (14).

10. The braking torque adjustment mechanism for a disc brake according to claim 4, characterized in that, The second brake pressure assembly (5) includes a spring mounting groove (51) disposed on the inner side of the brake housing (1) and on the outer side of the friction pad assembly (2). The spring mounting groove (51) is provided with a plurality of second brake springs (52), and one end of the second brake spring (52) acts in the spring mounting groove (51) and the other end acts on the small piston ring (311).

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