A motorcycle brake disc with convenient and stable locking

Abstract

The utility model discloses a kind of convenient and stable locking motorcycle brake disc, including brake disc and brake disc mounting seat, coaxial arrangement, and several locking structures are arranged along circumferential direction interval therebetween. Each group of locking structure includes the locking cylinder that is radially arranged, the knob connected with locking cylinder and the locking rod that is inserted into brake disc and mounting seat locking groove, locking cylinder is elastically pushed out under the action of spring, and locking rod can be inserted or withdrawn locking groove by pressing and rotating knob, realize the quick tool-free assembly and disassembly of brake disc relative mounting seat, and limit in unlocking position to prevent vibration and misoperation. The lower end of locking cylinder and the thimble, ball, No.2 spring and limiting plate in mounting seat constitute lower locking assembly, thimble middle part is equipped with clamping groove, ball is pressed into clamping groove to realize one-way self-locking under the action of elastic force, prevent locking structure axial escape under vibration;Self-locking can be released by external magnet attracting ball to separate clamping groove. The structure is convenient to assemble and disassemble, reliable connection, and has anti-theft function.

Description

Technical Field

[0001] This utility model relates to the field of motorcycle braking system technology, and in particular to a convenient and securely lockable motorcycle brake disc. Background Technology

[0002] Most motorcycles currently use disc brakes on the front and rear wheels. The brake discs are usually fixed to the wheel hub or brake disc mounting bracket by several bolts. If the brake disc needs to be replaced during the assembly of the whole vehicle or during later maintenance, all the bolts must be removed in sequence. The operation requires special tools such as wrenches, and the disassembly and assembly time is long and the labor intensity is high.

[0003] To improve maintenance efficiency, some technical solutions have attempted to use quick-release structures to position and connect brake discs, enabling rapid installation and removal without the need for traditional bolts. However, under prolonged motorcycle operation and frequent bumpy conditions, the quick-release locking components are prone to loosening or wear, making it difficult to guarantee the rigidity and stability of the connection between the brake disc and the mounting bracket. Furthermore, some quick-release structures can be unlocked with simple pressing or rotation at exposed parts, allowing unauthorized individuals to easily disassemble the brake disc without tools, posing significant safety hazards and theft risks.

[0004] Therefore, how to enable brake discs to lock and unlock quickly without the need for traditional bolts and special tools, without significantly increasing structural complexity and cost, while maintaining reliable circumferential and axial locking under vehicle operation and external impact conditions, and taking into account anti-theft security, is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] The technical problem to be solved by this utility model is: to achieve a brake disc structure that allows for convenient operation between the brake disc and the brake disc mounting base, reliable circumferential locking, and axial anti-dislodgement stability, while also taking into account anti-theft, without requiring tools for quick removal of the motorcycle brake disc.

[0006] To solve the above-mentioned technical problems, this utility model provides a convenient and stable locking motorcycle brake disc, which includes a brake disc and a brake disc mounting seat coaxially arranged with the brake disc. Several sets of locking structures are arranged circumferentially between the brake disc and the brake disc mounting seat. Each locking structure locks and releases the brake disc quickly through a purely mechanical means.

[0007] Each locking mechanism includes a locking post radially passing between the brake disc and the brake disc mount, a knob located on the outside of the brake disc and connected to the locking post, and a locking rod fixedly connected to the locking post and extending circumferentially. The brake disc and brake disc mount have locking grooves for accommodating the locking rod. A spring is sleeved on the outer periphery of the locking post to elastically push the locking post outwards axially, causing the locking rod to insert into the locking groove in the locked state. When the knob is pressed and rotates the locking post, the locking rod disengages from the locking groove, unlocking the mechanism.

[0008] Preferably, the brake disc and the brake disc mounting base are coaxially formed with matching mounting grooves, and the locking pin is assembled in the mounting groove and slides axially therein, so as to guide the locking pin axially and limit its radial movement. The brake disc mounting base is provided with a retaining plate for supporting the inner end of the first spring. One end of the first spring abuts against the lower part of the knob, and the other end abuts against the retaining plate, thereby ensuring a stable preload while maintaining a compact structure.

[0009] Preferably, a micro-groove is formed on the groove wall of the locking groove at the unlocking position corresponding to the locking rod, which cooperates with the end of the locking rod. When the knob is pressed and rotated to the unlocking angle, the locking rod enters the micro-groove under the elastic force of the first spring to achieve angular positioning, so that the knob in the unlocked state has a clear angular stop.

[0010] Preferably, each locking structure further includes a lower locking component connected to the lower end of the locking post, and a pin fixed in the brake disc mounting seat and cooperating with the lower locking component. The pin applies a one-way self-locking axial limit to the locking post to prevent the locking post and its upper components from accidentally coming out of the mounting slot under vehicle bumpy conditions.

[0011] Preferably, the ejector pin is arranged axially, with a circumferential locking groove in its middle; the lower locking assembly includes a cavity for accommodating the ejector pin, a ball bearing structure located within the cavity and distributed circumferentially, a limiting plate for radially limiting the ball bearing structure, and a second spring disposed between the locking pin and the limiting plate. Under the constraint of the second spring and the limiting plate, the ball bearing structure is pressed against the outer periphery of the ejector pin. When the ejector pin is inserted into the cavity, the ball bearings expand radially outward under the action of the inclined surface of the ejector pin's outer circle and eventually fall into the locking groove; when the ejector pin retracts in the opposite direction, the ball bearings and the sidewall of the locking groove wed each other to prevent the ejector pin from dislodging, thus forming an axial locking effect similar to one-way self-locking.

[0012] Furthermore, the lower end of the locking column is detachably connected to the lower housing that houses the second spring, the limiting plate, and the ball bearing structure via a snap-fit, allowing the lower locking assembly to be quickly disassembled and reassembled with the locking column as a whole, facilitating maintenance and replacement of easily damaged parts such as internal springs and balls.

[0013] Furthermore, the ball bearing structure is made of magnetic material and is configured to change the position of the pin relative to the locking pin under the magnetic field generated by the unlocker, thereby releasing the self-locking constraint on the locking slot. Thus, the pin can only be disassembled and the locking structure removed when operated with a special magnetic unlocking tool, improving anti-theft security.

[0014] This utility model employs the aforementioned technical solution, enabling quick assembly and disassembly of the brake disc and brake disc mounting base through multiple locking structures. The operator only needs to press and rotate the exposed knob to control the insertion and withdrawal of the locking rod in the locking groove, eliminating the need for wrenches or other specialized tools. This significantly shortens the assembly and replacement time of the brake disc and reduces maintenance labor intensity. The first spring continuously presses the locking post outwards, ensuring the locking rod is reliably inserted into the locking groove in the locked state. Combined with the micro-grooves on the locking groove wall, this provides angular positioning for the locking rod in the unlocked state, ensuring stable switching between locked and unlocked states and preventing unintentional knob rotation due to driving vibrations, thereby improving the reliability of the brake disc connection.

[0015] By incorporating coaxial mounting grooves on the brake disc and brake disc mounting base, the locking pin is axially guided and radially limited. The first spring is supported by a retaining plate on the mounting base, ensuring a clear force path and stable operation while maintaining a compact structure. The lower end of the locking pin, in conjunction with the ejector pin and lower locking assembly, forms a ball-and-socket type one-way self-locking structure. The ejector pin is easy to insert but difficult to remove, effectively preventing the locking pin from accidentally disengaging axially under bumpy or impact conditions, thus enhancing the impact resistance and service life of the entire locking structure. The locking pin and lower housing are detachably connected by a snap-fit ​​mechanism, allowing the lower locking assembly, including the second spring, limiting plate, and ball bearing structure, to be disassembled and reassembled as a whole. This facilitates cleaning and replacement of vulnerable parts, reducing maintenance costs. By designing the ball bearing structure and / or limiting plate as magnetic elements, and using a specific magnetic field generated by a dedicated unlocking device to release the self-locking constraint on the pin locking groove, the locking structure can only be unlocked by the action of a special tool. Ordinary tools and simple external forces are difficult to remove the brake disc, which significantly improves anti-theft and usage safety while achieving quick and convenient disassembly. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the overall structure of a convenient and securely locked motorcycle brake disc.

[0017] Figure 2 is a schematic diagram of the explosion structure of a convenient and securely locked motorcycle brake disc.

[0018] Figure 3 is a schematic diagram of a convenient and secure locking structure for motorcycle brake discs.

[0019] Figure 4 is a cross-sectional schematic diagram of a convenient and securely locking motorcycle brake disc.

[0020] 1. Brake disc; 11. Locking groove; 2. Brake disc mounting base; 21. Mounting groove; 22. Clamping plate; 3. Locking structure; 31. Knob; 32. Spring No. 1; 33. Locking column; 34. Locking rod; 35. Spring No. 2; 36. Limiting plate; 37. Ball bearing structure; 38. Buckle; 4. Ejector pin; 41. Snap-fit ​​groove. Detailed Implementation

[0021] The embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of this utility model, and not all embodiments. The components shown in the drawings can be varied and combined in different ways according to actual needs, and do not constitute a limitation on the scope of protection of this utility model.

[0022] like Figures 1 to 4 As shown, this embodiment of a convenient and securely locking motorcycle brake disc includes a brake disc mounting base 2 and a brake disc 1 coaxially arranged therewith. The brake disc 1 is detachably connected to the brake disc mounting base 2 via several sets of locking structures 3, enabling convenient installation and removal of the brake disc 1 while ensuring braking strength and connection reliability. Preferably, the brake disc mounting base 2 can be integrally forged from high-strength steel or aluminum alloy, and the brake disc 1 can be made of conventional wear-resistant brake steel or gray cast iron to meet the braking performance and heat dissipation requirements of motorcycles.

[0023] Several sets of locking structures 3 are arranged circumferentially between the brake disc 1 and the brake disc mounting seat 2. Each locking structure 3 penetrates the brake disc 1 and the brake disc mounting seat 2 radially, achieving partial locking and synchronous unlocking. For ease of processing and assembly, an annular mounting groove 21 is coaxially formed on the brake disc mounting seat 2. The inner side of the brake disc 1 can be provided with a partially mating structure corresponding to the mounting groove 21. The locking column 33 is assembled in the mounting groove 21 and slides axially within it, thereby providing axial guidance and radial limiting for the locking column 33. Several locking structure positions can be set circumferentially in the mounting groove 21 as needed. In this embodiment, three or four sets of locking structures 3 are preferably provided to obtain a better circumferentially uniform force distribution.

[0024] Each locking structure 3 includes an upper locking assembly and a cooperating lower locking assembly. The upper locking assembly mainly consists of a knob 31, a first spring 32, a locking post 33, and a locking rod 34. The locking post 33 is radially inserted into the mounting groove 21 of the brake disc mounting seat 2, and a first spring 32 is sleeved on its outer periphery. The first spring 32 is located between the knob 31 and the retaining plate 22 on the mounting seat 2, with one end abutting against the lower shoulder surface of the knob 31 and the other end abutting against the upper surface of the retaining plate 22, so that the locking post 33 is subjected to an elastic preload in the radial direction towards the outside, thereby automatically being in the extended locking position when no external force is applied. The retaining plate 22 can be fixed to the brake disc mounting seat 2 by screws or integrally formed with the mounting seat 2. Its material is preferably the same metal material as the mounting seat 2, which is convenient for processing and bearing the spring load.

[0025] The outer end of the locking post 33 is fixedly connected to the knob 31 by threads, pins, or an interference fit. The knob 31 is exposed on the outside of the brake disc 1, allowing the operator to press and rotate it directly. The shape of the knob 31 is not limited to the cylindrical or disc shape shown in the figure. It can be designed to fit the shape of the magnetic tool used for unlocking. For example, it can be a polygonal head with grooves or bosses, a disc structure with splines, or an irregularly shaped knob with radial protrusions, so that the magnetic unlocking tool can form a relatively stable placement and positioning position on the knob. Similarly, the end of the unlocking tool can also be cast with a recess or boss structure in the mating area that matches the shape of the knob 31, thereby ensuring a more stable relative position between the magnet and the magnetic elements inside the locking structure during use.

[0026] The locking rod 34 is arranged circumferentially and fixedly connected to the locking post 33. It can be integrally formed from a radially extending cylindrical section at the end of the locking post 33, or it can be fixed to the side wall of the locking post 33 by a pin. The brake disc 1 and the brake disc mounting seat 2 have circumferentially formed locking grooves 11 at corresponding positions. The depth and width of the locking grooves 11 match the shape of the locking rod 34. When the locking post 33 is in the extended position under the action of the first spring 32, the locking rod 34 is inserted into the locking groove 11, achieving circumferential locking of the brake disc 1 relative to the brake disc mounting seat 2. Preferably, the locking groove 11 extends along the thickness direction of the brake disc 1 and the brake disc mounting seat 2 to ensure sufficient force-bearing area for the locking rod 34 during operation, adapting to the torque and impact load during motorcycle braking.

[0027] To ensure a clear angular positioning of the unlocking position, a micro-groove is formed on the groove wall of the locking groove 11 at the unlocking position corresponding to the locking rod 34. This micro-groove can be a shallow circular pit or a sloped transition structure. When the operator presses the knob 31 to radially retract the locking rod 34 and rotate it to the predetermined unlocking angle, the end of the locking rod 34 is pushed into the micro-groove under the restoring force of the first spring 32, forming an angular limit in the unlocked state. This structure prevents the locking rod 34 from freely rotating due to motorcycle vibration in the unlocked state and does not affect subsequent locking operations by pressing the knob 31 again. Preferably, the locking rod 34 can be made of wear-resistant alloy steel or bearing steel, and the mating surface between its end and the micro-groove can be appropriately surface hardened or carburized to improve contact fatigue life.

[0028] A lower locking assembly is provided below the upper locking assembly. The lower locking assembly is used to apply a one-way self-locking axial limit to the locking pin 33 to prevent the locking structure from accidentally disengaging axially under bumpy driving conditions. The lower locking assembly includes a pin 4, a second spring 35, a limiting plate 36, and a ball bearing structure 37 located between the limiting plate 36 and the pin 4, all fixed within the brake disc mounting seat 2. The pin 4 is arranged axially and has a circumferential locking groove 41 machined in its middle. The pin 4 can be made of high-strength alloy steel or stainless steel and is fixed to the brake disc mounting seat 2 by interference fit or threaded connection to prevent it from loosening under braking conditions.

[0029] The housing of the lower locking assembly is preferably made of a non-magnetic or weakly magnetic material, such as stainless steel, aluminum alloy, or brass, to reduce the shielding effect of the housing on external magnetic fields, allowing the magnetic field generated by the external magnet to act more effectively on the ball structure 37 and the limiting plate 36. The lower end of the locking post 33 is detachably connected to the lower housing by a snap-fit ​​38, which can be a resilient claw, a snap ring, or a similar structure. This allows the lower locking assembly, including the second spring 35, the limiting plate 36, and the ball structure 37, to be disassembled as a whole. When replacing the internal spring and balls, other components do not need to be damaged, facilitating maintenance.

[0030] A limiting plate 36 is disposed inside the housing, and has several limiting holes along its circumference to accommodate the ball structure 37. The ball structure 37 is preferably composed of several steel balls, which are arranged at equal intervals along the circumference and can move in a limited radial direction within the holes of the limiting plate 36. A second spring 35 is disposed between the locking post 33 and the limiting plate 36. One end of the second spring 35 abuts against the bottom surface of the locking post 33, and the other end abuts against the limiting plate 36, so that the limiting plate 36 is continuously pushed axially towards the ejector pin 4, thereby continuously pressing the ball structure 37 against the outer periphery of the ejector pin 4 under the constraint of the cooperation between the limiting plate 36 and the housing. When the ejector pin 4 is inserted axially into the lower locking assembly cavity, the ball structure 37 is pushed open by the rounded corner or outer bevel of the ejector pin 4, overcoming its own weight and friction to open radially outward. When the ejector pin 4 continues to be inserted until its locking groove 41 is at the same axial height as the ball structure 37, the ball structure 37 falls into the locking groove 41 under the thrust of the second spring 35, realizing the one-way locking of the ejector pin 4. When the ejector pin 4 attempts to withdraw in the opposite direction, the ball structure 37 and the side wall of the locking groove 41 wed each other tightly, preventing the ejector pin 4 from coming out, thus forming a one-way self-locking effect that is easy to insert but difficult to pull out, effectively preventing the locking pin 33 and the upper locking assembly from being pushed out axially by impact.

[0031] To achieve the magnetic unlocking function, in this embodiment, the ball bearing structure 37 is at least partially made of a magnetic material, such as common bearing steel or other ferromagnetic alloys. The limiting plate 36 can be made of a non-magnetic material such as stainless steel or aluminum alloy, or it can also be made of a magnetic material, at least one of which has a high magnetic permeability to respond to an external magnetic field. When unlocking is not required, the second spring 35 pushes the limiting plate 36 toward the ejector pin 4, and the ball bearing structure 37 is stably pressed into the locking groove 41 under the constraint of the limiting hole and the limiting plate 36, so that the ejector pin 4 is always in a locked state. When unlocking is required, a separately configured magnetic unlocking tool can be used. This tool is essentially a single or group of ordinary magnets, such as permanent magnets, neodymium iron boron block magnets, electromagnets, etc. The operator places the magnetic unlocking tool at a predetermined position above the knob 31, allowing the magnetic field to be transmitted through the knob 31 and the locking post 33 to the lower locking assembly. This attracts or pushes the ball structure 37 radially away from the locking groove 41 of the ejector pin 4, thereby temporarily disengaging the ball structure 37 from the locking groove 41 and causing the ejector pin 4 to lose its self-locking constraint. At this time, by pressing the knob 31, the locking post 33 and the lower locking assembly connected to its lower end can move axially relative to the ejector pin 4, thus unlocking the ejector pin 4. Since the magnetic unlocking tool used is essentially an ordinary magnet and not a complex specialized device, examiners and those skilled in the art can directly understand and implement this unlocking method.

[0032] To avoid excessive shielding of the magnetic field by surrounding structural materials, which could affect the magnetic response of the ball bearing structure 37, the lower end shell of the locking post 33 and the area near the ejector pin 4 are preferably made of materials with moderate magnetic permeability, or the magnetic circuit bypass effect can be reduced by creating thinning sections or openings. For example, windows or thinning sections can be formed on the shell to concentrate the important magnetic circuit on the area where the ball bearing structure 37 is located, ensuring that the ball bearing structure 37 can be driven to move under a reasonable magnetic field strength. The knob 31 body is preferably made of non-magnetic metal or high-strength engineering plastic, such as aluminum alloy, stainless steel, POM, or nylon, to reduce the influence on the magnetic field, while also having good corrosion resistance and a good grip.

[0033] The working process of this embodiment is as follows: In the normal locking state, the first spring 32 pushes the locking post 33 radially outward, causing the locking rod 34 to insert into the locking groove 11 on the brake disc 1 and the brake disc mounting seat 2, thereby locking the brake disc 1 in the circumferential direction. The second spring 35 pushes the limiting plate 36 towards the ejector pin 4, and the ball bearing structure 37, constrained by the limiting hole, is pressed into the snap-fit ​​groove 41 of the ejector pin 4, forming a one-way self-locking on the locking post 33 in the axial direction, preventing the locking assembly from accidentally dislodging from the mounting groove 21 under bumps and impacts. In this state, a stable and reliable mechanical connection is formed between the brake disc 1 and the brake disc mounting seat 2, which can withstand the torque and impact load during motorcycle braking.

[0034] When it is necessary to remove the brake disc 1, first use a magnetic unlocking tool to approach or adhere to the upper surface of the knob 31, so that the magnetic field acts on the ball structure 37 and the limiting plate 36, causing the ball structure 37 to move radially relative to the ejector pin 4 under the action of the magnetic field, temporarily disengaging it from the locking groove 41. At this time, the operator keeps the magnetic unlocking tool in the knob 31 position with one hand, and presses the knob 31 with the other hand to overcome the elastic force of the first spring 32 and the second spring 35, so that the locking post 33 and the lower locking assembly move inward relative to the ejector pin 4, and the locking relationship between the ejector pin 4 and the lower locking assembly is released. Continue to press and rotate the locking post 33 through the knob 31, so that the locking rod 34 exits the locking groove 11 and turns to the position of the corresponding micro-groove. Under the restoring force of the first spring 32, the locking rod 34 can be pushed into the micro-groove, completing the angular positioning in the unlocked state. At this point, the brake disc 1 and the brake disc mounting base 2 are no longer locked in the circumferential direction. The brake disc 1 can be quickly disassembled by removing other auxiliary connecting parts or by directly pulling out the brake disc 1 axially.

[0035] During reinstallation, the brake disc 1 is fitted onto the outside of the brake disc mounting base 2, aligning the approximate positions of the locking structures 3. First, the self-locking of the ball bearing structure 37 to the pin 4 is released using a magnetic unlocking tool. Then, the knob 31 is pressed to retract the locking rod 34 and rotate it to align with the locking groove 11. Subsequently, the knob 31 is released, causing the first spring 32 to push the locking post 33 outward. The locking rod 34 automatically inserts into the locking groove 11 to complete circumferential locking. Simultaneously, under the action of the second spring 35, the ball bearing structure 37 falls back into the snap-fit ​​groove 41, achieving axial self-locking of the pin 4. After the above steps, the brake disc 1 can be reliably assembled without the aid of traditional bolts and wrenches. The overall operation process is simple and intuitive, facilitating quick brake disc replacement by maintenance personnel.

[0036] The above embodiments are merely preferred embodiments of this utility model, used to illustrate the technical solution of this utility model, and do not constitute a limitation on the protection scope of this utility model. Those skilled in the art can make various equivalent substitutions or modifications to the shape, size, material, and quantity of each component according to actual needs without departing from the spirit and essence of this utility model. For example, they can change the number and circumferential distribution of the locking structure 3, adjust the appearance of the knob 31 and the placement of the magnet, and make different selections for the magnetic material combination of the ball structure 37 and the limiting plate 36. All such equivalent substitutions or modifications should be included within the protection scope of this utility model.

Claims

1. A convenient and securely locking motorcycle brake disc, comprising a brake disc (1) and a brake disc mounting seat (2) coaxially disposed with the brake disc (1), characterized in that: Several sets of locking structures (3) are provided circumferentially between the brake disc (1) and the brake disc mounting base (2). Each of the locking structures (3) includes a locking post (33) that passes radially between the brake disc (1) and the brake disc mounting seat (2), a knob (31) disposed on the outside of the brake disc (1) and connected to the locking post (33), and a locking rod (34) that is fixedly connected to the locking post (33) and extends circumferentially. The brake disc (1) and the brake disc mounting base (2) are provided with locking grooves (11) for accommodating the locking rod (34). A first spring (32) is sleeved on the outer periphery of the locking column (33). The first spring (32) is used to elastically push the locking column (33) outward in the axial direction, so that the locking rod (34) is inserted into the locking groove (11) in the locked state. When the knob (31) is pressed and drives the locking column (33) to rotate, the locking rod (34) is disengaged from the locking groove (11).

2. The convenient and securely locking motorcycle brake disc according to claim 1, characterized in that, The brake disc (1) and the brake disc mounting base (2) form a coaxial mounting groove (21) to cooperate with each other. The locking column (33) is assembled in the mounting groove (21) and slides axially therein to guide the locking column (33) axially and limit its radial movement.

3. The convenient and securely locking motorcycle brake disc according to claim 2, characterized in that, The brake disc mounting base (2) is provided with a retaining plate (22) for supporting the inner end of the first spring (32). One end of the first spring (32) abuts against the lower part of the knob (31), and the other end abuts against the retaining plate (22).

4. A convenient and securely locking motorcycle brake disc according to claim 3, characterized in that, On the groove wall of the locking groove (11), a micro-groove is formed at the unlocking position corresponding to the locking rod (34) to cooperate with the end of the locking rod (34). When the knob (31) is pressed and rotated to the unlocking angle, the locking rod (34) enters the micro-groove under the elastic force of the first spring (32) to achieve angular positioning.

5. A convenient and securely locking motorcycle brake disc according to claim 4, characterized in that, Each of the locking structures (3) further includes a lower locking assembly connected to the lower end of the locking column (33), and a pin (4) fixed in the brake disc mounting seat (2) and cooperating with the lower locking assembly, the pin (4) being used to apply a one-way self-locking axial limit to the locking column (33).

6. A convenient and securely locking motorcycle brake disc according to claim 5, characterized in that, The ejector pin (4) is arranged axially, and a circumferential locking groove (41) is provided in its middle. The lower locking assembly includes a cavity for accommodating the ejector pin (4), a ball structure (37) located in the cavity and distributed circumferentially, a limiting plate (36) for limiting the ball structure (37) in the radial direction, and a second spring (35) disposed between the locking post (33) and the limiting plate (36). The ball structure (37) is pressed against the outer periphery of the ejector pin (4) under the constraint of the second spring (35) and the limiting plate (36). When the ejector pin (4) is inserted into the cavity, the ball structure (37) expands radially outward under the action of the outer circumferential inclined surface of the ejector pin (4) and finally falls into the locking groove (41). When the ejector pin (4) is withdrawn in the reverse direction, the ball structure (37) and the side wall of the locking groove (41) are wedged together to prevent the ejector pin (4) from coming out.

7. A convenient and securely locking motorcycle brake disc according to claim 6, characterized in that, The lower end of the locking column (33) is detachably connected to the lower housing that houses the second spring (35), the limiting plate (36) and the ball structure (37) by a snap fastener (38).

8. A convenient and securely locking motorcycle brake disc according to claim 6, characterized in that, The ball structure (37) is made of magnetic material and is configured to change its position relative to the pin (4) under the action of the magnetic field generated by the unlocker to release the self-locking constraint on the locking groove (41).

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