Clutch braking device with reverse rotation preventing function

Abstract

The utility model discloses a clutch braking device with an anti-reverse function, which belongs to the technical field of clutch braking and comprises a mounting device, a clutch device used for clutch adjustment and a braking device used for braking the clutch device are mounted on the mounting device, and the clutch device is connected with the braking device. The brake device comprises an anti-reversion assembly, a detachable brake disc assembly, two brake driving assemblies and two brake assemblies, the anti-reversion assembly is connected with the mounting device and the clutch device, the detachable brake disc assembly is mounted on the clutch device, and the two brake driving assemblies are mounted on the inner side of the mounting device; the two brake assemblies are correspondingly installed on the two brake driving assemblies respectively. By means of the mode, the braking efficiency and stability are improved by clamping the two sides of the detachable brake disc assembly through the braking assembly, and the problem that the clutch device reversely rotates in the rotating and braking process can be effectively solved through the arrangement of the anti-reverse-rotation assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of clutch brakes, in particular to a clutch brake device with an anti-reverse function. Background Art

[0002] The clutch is a device used in mechanical transmission systems, mainly used to control the transmission and cut-off of power. However, the clutch state cannot immediately stop the machine from running, so in some cases the clutch is braked through a braking device.

[0003] For example, Chinese patent application CN102425634B discloses a clutch with a braking function, comprising a clutch active sleeve mounted on a drive shaft and a clutch housing mounted on a driven shaft, a main driven disc mounted on the clutch active sleeve, and a secondary driven disc mounted on the clutch housing. The clutch housing comprises an inner sleeve and an outer sleeve, the front end of the inner sleeve is inserted into the rear end of the clutch active sleeve, a main spring and a piston are mounted between the inner sleeve and the outer sleeve, the front end of the main spring is connected to the inner sleeve, and the rear end of the main spring rests on the piston, a hydraulic oil channel is provided in the clutch housing, an annular boss is provided on the outer surface of the clutch housing, a plurality of spring seats are evenly distributed along the circumference of the annular boss, a secondary spring is installed in the spring seat, an axially movable brake disc is mounted on the outer surface of the clutch housing, the secondary spring is located between the spring seat and the brake disc, the brake disc is fixedly connected to the piston through a piston pin, and a baffle assembly is fixedly mounted on the clutch housing.

[0004] However, when the clutch with braking function is in normal use and the brake disc and baffle assembly are combined to block, the impact force of the external fixed object is large, the braking state is unstable, and the clutch reversal at the moment of braking cannot be avoided.

[0005] Based on this, the utility model designs a clutch brake device with an anti-reverse function to solve the above problem. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides a clutch braking device with an anti-reverse function.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A clutch brake device with an anti-reverse function includes a mounting device;

[0009] A clutch device for clutch adjustment and a brake device for braking the clutch device are installed on the mounting device, and the clutch device is connected to the brake device;

[0010] The braking device includes an anti-reversal component for preventing the clutch device from reversing, a detachable brake disc component for connecting to the clutch device for braking, two brake drive components for providing driving force for braking, and two brake components for clamping the detachable brake disc component to brake the clutch device. The anti-reversal component is connected to the mounting device and the clutch device, the detachable brake disc assembly is installed on the clutch device, the two brake drive components are installed on the inner side of the mounting device, and the two brake components are respectively installed on the two brake drive components.

[0011] Furthermore, the mounting device includes a mounting plate, a top plate and a bottom plate, the top plate is fixedly mounted on the upper end of the mounting plate, the bottom plate is fixedly mounted on the lower end of the mounting plate, the mounting plate is connected to the clutch device, the anti-reverse assembly, the detachable brake disc assembly and the brake drive assembly, and the top plate and the bottom plate are respectively connected to a brake drive assembly.

[0012] Furthermore, the clutch device includes a movable semi-clutch disc, a fixed semi-clutch disc and a rotating shaft. The movable semi-clutch disc is located on the left side of the fixed semi-clutch disc. A rotating shaft is fixedly installed on the right end of the fixed semi-clutch disc. The rotating shaft passes through the mounting plate and is rotatably connected to the mounting plate. The rotating shaft is connected to the anti-reversal assembly and the detachable brake disc assembly. The right end of the movable semi-clutch disc and the left end of the fixed semi-clutch disc are correspondingly provided with mutually cooperating teeth for meshing connection. The center of the movable semi-clutch disc, the center of the fixed semi-clutch disc and the axis of the rotating shaft are collinear.

[0013] Furthermore, the anti-reversal assembly includes a mounting seat, two spring plates, two springs, two pawls and an internally meshing ratchet. The mounting seat is fixedly connected to the rotating shaft, the mounting seat is rotatably connected to the right end of the mounting plate, the two spring plates are fixedly installed on the right end of the mounting seat, the two pawls are rotatably installed on the right end of the mounting seat, the two ends of the two springs are respectively fixedly connected to the spring plates and the pawls, the pawls are meshed with the inner side of the internally meshing ratchet, and the internally meshing ratchet is fixedly installed on the right end of the mounting plate.

[0014] Furthermore, the detachable brake disc assembly includes a fixed plate, a brake disc, multiple threaded rods and multiple nuts. The fixed plate is fixedly installed on the rotating shaft. The fixed plate is located at the right end of the internal meshing ratchet. Multiple threaded rods are evenly distributed and fixed on the right end of the fixed plate. The brake disc passes through the threaded rods and is in contact with the fixed plate. Multiple nuts are threadedly connected to the threaded rods one by one, and the nuts are in contact with the brake disc.

[0015] Furthermore, the two brake drive assemblies are symmetrically arranged on the inner sides of the top plate and the bottom plate respectively. The brake drive assembly includes a cylinder mounting bracket and an electric cylinder. The cylinder mounting bracket is fixedly installed on the right end of the mounting plate. The upper electric cylinder is fixedly installed between the top plate and the upper cylinder mounting bracket. The lower electric cylinder is fixedly installed between the bottom plate and the lower cylinder mounting bracket. The output end of the electric cylinder passes through the cylinder mounting bracket and is connected to the brake assembly. The output direction of the electric cylinder is toward the side close to the brake disc.

[0016] Furthermore, the two brake assemblies are symmetrically arranged on the inner sides of the two cylinder mounting frames, and the brake assembly includes a push plate, two inclined blocks, two brake blocks and two inclined slot blocks. The push plate is fixedly connected to the output end of the electric cylinder, and the two inclined blocks are symmetrically arranged along the left and right sides of the brake disc. The outer sides of the two inclined blocks are inclined and connected to the inclined slot blocks for limiting sliding. A groove is provided on the inner side of the inclined block to cooperate with the sliding of the push plate. The push plate is located in the slide groove on the inner side of the inclined block and is slidably connected to the inclined block. A protrusion that cooperates with the brake block is provided on the inner side of the inclined block. The two inclined slot blocks are fixedly installed on the inner sides of the protrusions of the two inclined blocks by bolts, and the side of the inclined slot block away from the brake disc is fixedly connected to the cylinder mounting frame.

[0017] Furthermore, the outer side of the inclined block is gradually inclined inward from the side away from the brake disc toward the side close to the brake disc, the inner sides of the two inclined groove blocks are inclined to cooperate with the inclined block, the inner sides of the two brake blocks are provided with protrusions that increase friction, and the outer side of the brake disc is provided with an annular protrusion that cooperates with the inner side of the brake block to increase friction.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. The braking efficiency and stability are increased by the double-sided clamping of the detachable brake disc assembly by the brake assembly, and the problem of the clutch device reversing during the rotation and braking process can be effectively prevented by the setting of the anti-reversal assembly;

[0019] 2. The detachable brake disc and brake pads and the avoidance setting of the inclined block to the brake disc when the vehicle stops running make it easy to replace the brake disc and brake pads when they are severely worn, thus avoiding accidents caused by reduced braking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0021] Figure 1 The utility model is a three-dimensional clutch brake device with anti-reverse function Figure 1 ;

[0022] Figure 2 This is a front view of a clutch brake device with an anti-reverse function according to the present invention;

[0023] Figure 3 This is a right side view of a clutch brake device with an anti-reverse function according to the present invention;

[0024] Figure 4 The utility model is a three-dimensional clutch brake device with anti-reverse function Figure 2 ;

[0025] Figure 5 To follow Figure 2 AA direction cross-sectional view;

[0026] Figure 6 This is a partial disassembly diagram of the braking device of the present invention.

[0027] The numbers in the figure represent:

[0028] 1. Mounting device; 11. Mounting plate; 12. Top plate; 13. Bottom plate; 2. Clutch device; 21. Movable semi-clutch disc; 22. Fixed semi-clutch disc; 23. Rotating shaft; 3. Braking device; 31. Anti-reverse assembly; 311. Mounting seat; 312. Spring plate; 313. Spring; 314. Pawl; 315. Internally meshing ratchet; 32. Removable brake disc assembly; 321. Fixed plate; 322. Brake disc; 323. Threaded rod; 324. Nut; 33. Brake drive assembly; 331. Cylinder mounting bracket; 332. Electric cylinder; 34. Braking assembly; 341. Push plate; 342. Bevel block; 343. Brake block; 344. Bevel block. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] The terms “left,” “right,” “front,” “back,” “up,” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0031] In some embodiments, please refer to the accompanying drawings of the specification. Figures 1-6 , a clutch brake device with an anti-reverse function, comprising a mounting device 1;

[0032] The mounting device 1 is provided with a clutch device 2 for clutch adjustment and a brake device 3 for braking the clutch device 2, and the clutch device 2 is connected to the brake device 3;

[0033] The braking device 3 includes an anti-reversal component 31 for preventing the clutch device 2 from reversing, a detachable brake disc component 32 for connecting to the clutch device 2 for braking, two brake drive components 33 for providing driving force for braking, and two brake components 34 for clamping the detachable brake disc component 32 to brake the clutch device 2. The anti-reversal component 31 is connected to the mounting device 1 and the clutch device 2, the detachable brake disc component 32 is installed on the clutch device 2, the two brake drive components 33 are installed on the inner side of the mounting device 1, and the two brake components 34 are respectively installed on the two brake drive components 33.

[0034] When the clutch brake device with anti-reverse function is in normal use, the brake drive component 33 is started, and the brake drive component 33 drives the brake component 34 to clamp the detachable brake disc component 32 on both sides to increase friction and brake the detachable brake disc component 32. The detachable brake disc component 32 drives the clutch device 2 to stop rotating, and the anti-reverse component 31 prevents the clutch device 2 from reversing during the rotation and braking process of the clutch device 2. The brake component 34 clamps the detachable brake disc component 32 on both sides, which increases the braking efficiency and stability. The detachable setting of the detachable brake disc component 32 facilitates regular replacement of the components of the detachable brake disc component 32 to avoid brake failure caused by long-term use. The setting of the anti-reversal component 31 can effectively prevent the clutch device 2 from reversing during rotation and braking.

[0035] The mounting device 1 includes a mounting plate 11, a top plate 12 and a bottom plate 13. The top plate 12 is fixedly mounted on the upper end of the mounting plate 11, and the bottom plate 13 is fixedly mounted on the lower end of the mounting plate 11. The mounting plate 11 is connected to the clutch device 2, the anti-reversal component 31, the detachable brake disc component 32 and the brake drive component 33. The top plate 12 and the bottom plate 13 are respectively connected to a brake drive component 33.

[0036] The clutch device 2 includes a movable semi-clutch disc 21, a fixed semi-clutch disc 22 and a rotating shaft 23. The movable semi-clutch disc 21 is located on the left side of the fixed semi-clutch disc 22. The right end of the fixed semi-clutch disc 22 is fixedly installed with a rotating shaft 23. The rotating shaft 23 passes through the mounting plate 11 and is rotatably connected to the mounting plate 11. The rotating shaft 23 is connected to the anti-reverse component 31 and the detachable brake disc component 32. The right end of the movable semi-clutch disc 21 and the left end of the fixed semi-clutch disc 22 are correspondingly provided with mutually cooperating teeth for meshing connection. The center of the movable semi-clutch disc 21, the center of the fixed semi-clutch disc 22 and the axis of the rotating shaft 23 are collinear.

[0037] The anti-reversal assembly 31 includes a mounting seat 311, two spring plates 312, two springs 313, two pawls 314 and an internally meshing ratchet 315. The mounting seat 311 is fixedly connected to the rotating shaft 23, and the mounting seat 311 is rotatably connected to the right end of the mounting plate 11. The two spring plates 312 are fixedly installed on the right end of the mounting seat 311, and the two pawls 314 are rotatably installed on the right end of the mounting seat 311. The two ends of the two springs 313 are fixedly connected to the spring plates 312 and the pawls 314 respectively, and the pawls 314 are meshed with the inner side of the internally meshing ratchet 315, and the internally meshing ratchet 315 is fixedly installed on the right end of the mounting plate 11.

[0038] The detachable brake disc assembly 32 includes a fixed plate 321, a brake disc 322, multiple threaded rods 323 and multiple nuts 324. The fixed plate 321 is fixedly installed on the rotating shaft 23. The fixed plate 321 is located at the right end of the internally meshing ratchet 315. Multiple threaded rods 323 are evenly distributed and fixedly installed on the right end of the fixed plate 321. The brake disc 322 passes through the threaded rods 323 and is in contact with the fixed plate 321. Multiple nuts 324 are threadedly connected to the threaded rods 323 in a one-to-one correspondence, and the nuts 324 are in contact with the brake disc 322.

[0039] The two brake drive components 33 are symmetrically arranged on the inner sides of the top plate 12 and the bottom plate 13 respectively. The brake drive component 33 includes a cylinder mounting bracket 331 and an electric cylinder 332. The cylinder mounting bracket 331 is fixedly mounted on the right end of the mounting plate 11. The upper electric cylinder 332 is fixedly mounted between the top plate 12 and the upper cylinder mounting bracket 331. The lower electric cylinder 332 is fixedly mounted between the bottom plate 13 and the lower cylinder mounting bracket 331. The output end of the electric cylinder 332 is connected to the brake component 34 through the cylinder mounting bracket 331, and the output direction of the electric cylinder 332 is toward the side close to the brake disc 322.

[0040] The two brake assemblies 34 are respectively located on the inner sides of the two cylinder mounting frames 331 and are symmetrically arranged. The brake assembly 34 includes a push plate 341, two inclined blocks 342, two brake blocks 343 and two inclined slot blocks 344. The push plate 341 is fixedly connected to the output end of the electric cylinder 332. The two inclined blocks 342 are symmetrically arranged along the left and right sides of the brake disc 322. The outer sides of the two inclined blocks 342 are inclined and connected to the inclined slot blocks 344 for limited sliding. A groove is provided on the inner side of the inclined block 342 to cooperate with the sliding of the push plate 341. The push plate 341 is located in the slide groove on the inner side of the inclined block 342 and is slidably connected to the inclined block 342. A protrusion that cooperates with the brake block 343 is provided on the inner side of the inclined block 342. The two inclined slot blocks 344 are fixedly installed on the inner side of the protrusions of the two inclined blocks 342 by bolts. The side of the inclined slot block 344 away from the brake disc 322 is fixedly connected to the cylinder mounting frame 331.

[0041] The outer side of the inclined block 342 is gradually inclined inward from the side away from the brake disc 322 to the side close to the brake disc 322, the inner sides of the two inclined groove blocks 344 are inclined to cooperate with the inclined block 342, the inner sides of the two brake blocks 343 are provided with protrusions that increase friction, and the outer side of the brake disc 322 is provided with an annular protrusion that cooperates with the inner side of the brake block 343 to increase friction.

[0042] When the clutch brake device with anti-reverse function is in normal use, the movable half-clutch disc 21 moves to the right to engage with the fixed half-clutch disc 22 and drive the fixed half-clutch disc 22 to rotate synchronously, and the fixed half-clutch disc 22 drives the rotating shaft 23 to rotate synchronously. When braking is needed, the electric cylinder 332 is started, and the electric cylinder 332 drives the push plate 341 to move toward the brake disc 322. The push plate 341 drives the inclined block 342 to move, and the inclined block 342 slides along the inclined groove block 344 so that the two inclined blocks 342 move downward and move inward at the same time. The two inclined blocks 342 drive the brake block 343 to move so that the brake block 343 contacts the brake disc 322 and gradually clamps it. Under the action of the brake block 343, the brake disc 322 stops rotating, and the brake disc 322 drives the fixed plate 321 to stop rotating, and the fixed plate 321 drives the rotating shaft 2 When the cam 322 is in the unlocked position, the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam 322 is in the unlocked position, and the cam

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A clutch brake device with an anti-reverse function, comprising a mounting device (1), characterized in that: A clutch device (2) for clutch adjustment and a brake device (3) for braking the clutch device (2) are installed on the mounting device (1), and the clutch device (2) is connected to the brake device (3); The braking device (3) comprises an anti-reversal component (31) for preventing the clutch device (2) from reversing, a detachable brake disc component (32) for connecting to the clutch device (2) for braking, two brake drive components (33) for providing driving force for braking, and two brake components (34) for clamping the detachable brake disc component (32) to brake the clutch device (2). The anti-reversal component (31) is connected to the mounting device (1) and the clutch device (2), the detachable brake disc component (32) is mounted on the clutch device (2), the two brake drive components (33) are mounted on the inner side of the mounting device (1), and the two brake components (34) are respectively mounted on the two brake drive components (33).

2. The clutch brake device with anti-reverse function according to claim 1, characterized in that: The mounting device (1) comprises a mounting plate (11), a top plate (12) and a bottom plate (13); the top plate (12) is fixedly mounted on the upper end of the mounting plate (11); the bottom plate (13) is fixedly mounted on the lower end of the mounting plate (11); the mounting plate (11) is connected to the clutch device (2), the anti-reverse assembly (31), the detachable brake disc assembly (32) and the brake drive assembly (33); the top plate (12) and the bottom plate (13) are respectively connected to one brake drive assembly (33).

3. The clutch brake device with anti-reverse function according to claim 2, characterized in that: The clutch device (2) comprises a movable semi-clutch disc (21), a fixed semi-clutch disc (22) and a rotating shaft (23). The movable semi-clutch disc (21) is located to the left of the fixed semi-clutch disc (22). The right end of the fixed semi-clutch disc (22) is fixedly mounted with a rotating shaft (23). The rotating shaft (23) passes through the mounting plate (11) and is rotatably connected to the mounting plate (11). The rotating shaft (23) is connected to the anti-reversal component (31) and the detachable brake disc component (32). The right end of the movable semi-clutch disc (21) and the left end of the fixed semi-clutch disc (22) are correspondingly provided with teeth that cooperate with each other for meshing connection. The center of the movable semi-clutch disc (21), the center of the fixed semi-clutch disc (22) and the axis of the rotating shaft (23) are collinear.

4. The clutch brake device with anti-reverse function according to claim 3, characterized in that: The anti-reversal assembly (31) comprises a mounting seat (311), two spring plates (312), two springs (313), two pawls (314) and an inner meshing ratchet (315), wherein the mounting seat (311) is fixedly connected to the rotating shaft (23), the mounting seat (311) is rotatably connected to the right end of the mounting plate (11), the two spring plates (312) are fixedly mounted on the right end of the mounting seat (311), the two pawls (314) are rotatably mounted on the right end of the mounting seat (311), the two ends of the two springs (313) are fixedly connected to the spring plates (312) and the pawls (314) respectively, the pawls (314) are meshed with the inner side of the inner meshing ratchet (315), and the inner meshing ratchet (315) is fixedly mounted on the right end of the mounting plate (11).

5. The clutch brake device with anti-reverse function according to claim 4, characterized in that: The detachable brake disc assembly (32) comprises a fixing plate (321), a brake disc (322), a plurality of threaded rods (323) and a plurality of nuts (324). The fixing plate (321) is fixedly mounted on the rotating shaft (23). The fixing plate (321) is located at the right end of the internally meshing ratchet (315). A plurality of threaded rods (323) are evenly distributed and fixedly mounted on the right end of the fixing plate (321). The brake disc (322) passes through the threaded rods (323) and is in contact connection with the fixing plate (321). The plurality of nuts (324) are threadedly connected to the threaded rods (323) in a one-to-one correspondence. The nuts (324) are in contact connection with the brake disc (322).

6. The clutch brake device with anti-reverse function according to claim 5, characterized in that: The two brake drive assemblies (33) are symmetrically arranged on the inner sides of the top plate (12) and the bottom plate (13), respectively. The brake drive assembly (33) includes a cylinder mounting frame (331) and an electric cylinder (332). The cylinder mounting frame (331) is fixedly mounted on the right end of the mounting plate (11). The upper electric cylinder (332) is fixedly mounted between the top plate (12) and the upper cylinder mounting frame (331). The lower electric cylinder (332) is fixedly mounted between the bottom plate (13) and the lower cylinder mounting frame (331). The output end of the electric cylinder (332) passes through the cylinder mounting frame (331) and is connected to the brake assembly (34). The output direction of the electric cylinder (332) is toward the side close to the brake disc (322).

7. The clutch brake device with anti-reverse function according to claim 6, characterized in that: The two brake assemblies (34) are respectively located on the inner sides of the two oil cylinder mounting frames (331) and are symmetrically arranged. The brake assembly (34) includes a push plate (341), two inclined blocks (342), two brake blocks (343) and two inclined slot blocks (344). The push plate (341) is fixedly connected to the output end of the electric cylinder (332). The two inclined blocks (342) are symmetrically arranged along the brake disc (322). The outer sides of the two inclined blocks (342) are inclined to slide with the inclined slot blocks (344) in a limited manner. The inclined block (342) is provided with a groove on the inner side thereof for cooperating with the push plate (341) for sliding. The push plate (341) is located in the groove on the inner side thereof and is slidably connected with the inclined block (342). The inner side of the inclined block (342) is provided with a protrusion for cooperating with the brake block (343) for fixing. The two inclined slot blocks (344) are fixedly mounted on the inner sides of the protrusions of the two inclined blocks (342) by bolts. The side of the inclined slot block (344) away from the brake disc (322) is fixedly connected to the cylinder mounting frame (331).

8. The clutch brake device with anti-reverse function according to claim 7, characterized in that: The outer side of the inclined block (342) is gradually inclined inward from the side away from the brake disc (322) toward the side close to the brake disc (322), the inner sides of the two inclined groove blocks (344) are inclined to match the inclined block (342), the inner sides of the two brake blocks (343) are provided with protrusions for increasing friction force, and the outer side of the brake disc (322) is provided with an annular protrusion for matching the inner side of the brake block (343) for increasing friction force.

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