Anti-deformation thick-wall pig iron brake disc
By designing the braking extension mechanism and the heat dissipation mechanism, the problem of heat concentration in thick-walled cast iron brake discs during high-speed braking is solved, achieving uniform distribution and efficient heat dissipation of frictional heat, preventing warping and deformation, and enhancing connection stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-10
- Publication Date
- 2026-04-10
AI Technical Summary
Thick-walled cast iron brake discs generate heat due to friction during high-speed braking, which is concentrated in the outer area, resulting in significant local temperature differences and causing warping, deformation, and surface cracking.
The design incorporates a braking extension mechanism and a heat dissipation mechanism. By extending the brake blocks, the friction area is increased and heat is evenly distributed. At the same time, forced airflow from the blades accelerates heat dissipation. Combined with a stable mounting mechanism, stress is buffered to prevent deformation.
It significantly reduces local peak temperature and thermal stress, enhances heat dissipation efficiency, reduces the risk of warping and surface cracking, and improves connection stability.
Smart Images
Figure CN121828368A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of cast iron brake disc technology, and in particular relates to a thick-walled cast iron brake disc that is resistant to deformation. Background Technology
[0002] Pig iron brake discs are key components of vehicle braking systems made from cast iron materials such as gray cast iron or ductile iron, through smelting, casting, and subsequent machining and heat treatment.
[0003] In existing technologies, during continuous high-speed braking, the brake pads have a constant contact area and typically cover the outer perimeter of the disc, causing frictional heat to concentrate at the outer edge of the disc. However, the thick-walled cast iron material itself has low thermal conductivity, making it difficult for heat to dissipate evenly and promptly, resulting in a significant temperature difference between the center and outer perimeter of the disc. This localized high temperature and uneven thermal expansion-contraction effect easily accumulate thermal stress within the disc, leading to warping, deformation, and even surface cracking of the brake disc. Therefore, we propose a deformation-resistant thick-walled cast iron brake disc. Summary of the Invention
[0004] The purpose of this invention is to provide a deformation-resistant thick-walled cast iron brake disc. Through the design of the extended brake block, pushing block and linkage components of the brake extension mechanism, the problem of warping, deformation and even surface cracking of the brake disc surface is solved. In the prior art, when the traditional thick-walled cast iron brake disc is continuously braked at high speed, the brake block's action area is constant and concentrated on the outer periphery of the disc surface, resulting in localized accumulation of frictional heat, significant temperature difference between the center and the periphery of the disc, and uneven thermal expansion-contraction effect.
[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: The present invention is a thick-walled cast iron brake disc that is resistant to deformation, including a hub, a disc body fixedly connected to the circumferential surface of the hub, a mounting sleeve provided on the circumferential surface of the disc body, a bolt passing through the mounting sleeve, a pushing piston provided inside the mounting sleeve, a brake block fixedly connected to the end of the pushing piston away from the mounting sleeve, and a brake expansion mechanism provided inside the mounting sleeve. The brake extension mechanism includes a mounting groove inside the brake block. A push block is slidably connected inside the mounting groove, and a support shaft is rotatably connected inside the mounting groove. A force-bearing plate and a pressure plate are fixedly connected to the circumferential surface of the support shaft. A sliding groove is provided inside the mounting groove, and an extended brake block is slidably connected inside the sliding groove. A torsion spring is fixedly connected inside the mounting groove, with its end away from the mounting groove fixedly connected to the circumferential surface of the support shaft. A return spring is fixedly connected inside the mounting groove, with its end away from the mounting groove fixedly connected to the bottom of the extended brake block. The purpose of this mechanism is to increase the effective friction area by automatically extending the extended brake block during braking, thereby distributing frictional heat more evenly over a wider area of the disc and reducing localized high temperatures and thermal stress concentration.
[0006] Furthermore, the number of the return springs is set to two, and they are arranged in a linear array inside the mounting slot. The purpose of this is to provide a smooth and balanced return force for the extended brake block, ensuring that it can reliably retract in the non-braking state.
[0007] Furthermore, the bottom of the force plate is located on the displacement trajectory of the push block, and the top of the extended brake block is located on the displacement trajectory of the pressure plate. The purpose is that when the push piston pushes the brake block to move towards the disc, the push block moves synchronously and pushes the force plate, driving the support shaft to rotate, thereby causing the pressure plate to press down on the extended brake block, thus achieving precise mechanical linkage of the extension action.
[0008] Furthermore, the initial position of the extended brake block is larger than the distance between the brake block and the disc body than the distance between the brake block and the disc body. The purpose is to ensure that in the initial stage of braking, the brake block contacts the disc body first to generate braking force. When the braking force demand increases or heat accumulates, the extended brake block extends to participate in the work, so as to realize the expansion of braking force and heat dissipation area as needed.
[0009] Furthermore, the disc body is internally equipped with a heat dissipation mechanism, which includes a heat dissipation chamber located inside the disc body. A heat dissipation vent is formed on the circumferential surface of the disc body, and a heat dissipation hole is formed between the disc body and the heat dissipation chamber. A control shaft is rotatably connected inside the heat dissipation chamber. A blade is fixedly connected to the circumferential surface of the control shaft, and a lever is fixedly connected to the circumferential surface of the control shaft. An arc-shaped groove is formed on the side of the disc body, and the circumferential surface of the lever is slidably connected to the interior of the arc-shaped groove. A second torsion spring is fixedly connected inside the heat dissipation chamber, with one end of the torsion spring away from the heat dissipation chamber fixedly connected to the circumferential surface of the control shaft. The purpose of this is to utilize the movement of the extended brake block during braking to trigger the heat dissipation mechanism, drive the blade to rotate, forcibly agitate and promote airflow within the heat dissipation chamber, and accelerate heat dissipation from the inside of the disc body to the outside, thereby achieving active and enhanced heat dissipation.
[0010] Furthermore, the number of control shafts, blades, and torsion springs is set to several, and they are arranged in a circumferential array along the circumference of the disk. The purpose is to achieve comprehensive and uniform heat dissipation of the circumferential area of the disk through the heat dissipation units distributed at multiple points, so as to avoid local heat retention.
[0011] Furthermore, one end of the lever is located on the displacement trajectory of the extended brake block after its movement. The purpose of this is to ensure that the extended brake block can push the lever when it extends, thereby driving the blade to rotate and achieving automatic coordination between braking action and active heat dissipation.
[0012] Furthermore, the wheel hub is provided with a stable mounting mechanism, which includes a positioning hole inside the wheel hub, a bolt mounting port inside the wheel hub, a placement groove inside the wheel hub, a moving groove inside the placement groove, an arc-shaped rubber block fixedly connected inside the placement groove, a moving block fixedly connected to the circumference of the arc-shaped rubber block, the side of the moving block slidingly connected to the inside of the moving groove, and a rubber ring slidingly connected inside the bolt mounting port. The purpose is to absorb and even out the assembly stress, vibration, and thermal deformation stress at the connection between the wheel hub and the axle through an elastic buffer and stress dispersion structure, reduce stress concentration at the installation interface, and suppress deformation transmission.
[0013] Furthermore, the number of bolt mounting holes is set to several and arranged in a circumferential array along the circumference of the wheel hub. The purpose is to ensure the stability of the connection between the wheel hub and the axle through high-strength bolts that are evenly distributed at multiple points.
[0014] Furthermore, one end of the movable block extends beyond the movable groove located inside the bolt mounting opening. The purpose of this is that when tightening the bolt, its end can push the movable block, thereby compressing the arc-shaped rubber block, generating a preload and filling the gap, thus forming elastic locking and buffering.
[0015] The present invention has the following beneficial effects: 1. The present invention dynamically increases the effective friction contact area during braking by cooperating with the extended brake block, the pushing block and the linkage components of the brake extension mechanism. This distributes the frictional heat more evenly on the disc surface, significantly reducing local peak temperature and thermal stress, and suppressing brake disc warping and deformation caused by heat concentration from the source.
[0016] 2. The present invention utilizes the cooperation between the blades, levers and trigger components of the heat dissipation mechanism to automatically drive forced convection of internal air by braking action, which significantly enhances the heat dissipation efficiency of the thick-walled brake disc itself, promotes the rapid dissipation of heat from the inside to the outside, and further balances the temperature distribution of the disc.
[0017] 3. The present invention provides effective elastic buffering and stress dispersion for the connection between the brake disc and the axle by cooperating with the components such as the arc-shaped rubber block, the moving block and the rubber ring of the stable installation mechanism, thereby reducing stress concentration and vibration transmission at the installation interface and reducing the risk of deformation induced by external factors.
[0018] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a structural schematic diagram of the overall three-dimensional appearance of the present invention; Figure 2 This is a schematic diagram of the structure of the mounting sleeve in three-dimensional bottom view of the present invention; Figure 3 This is a three-dimensional cross-sectional structural schematic diagram of the brake block of the present invention; Figure 4 This is a three-dimensional enlarged structural schematic diagram of the extended braking block of the present invention; Figure 5 This is a three-dimensional cross-sectional structural schematic diagram of the disk body of the present invention; Figure 6 This is a three-dimensional enlarged structural schematic diagram of the control axis of the present invention; Figure 7 This is a three-dimensional enlarged structural diagram of the stable mounting mechanism of the present invention.
[0021] The attached diagram lists the components represented by each number as follows: 1. Hub; 2. Disc; 3. Mounting sleeve; 4. Push piston; 5. Brake block; 6. Brake extension mechanism; 7. Bolt; 8. Heat dissipation mechanism; 9. Stabilizing mounting mechanism; 61. Mounting groove; 62. Push block; 63. Support shaft; 64. Force plate; 65. Pressure plate; 66. Slide groove; 67. Extended brake block; 68. Torsion spring one; 69. Return spring; 81. Heat dissipation chamber; 82. Heat dissipation vent; 83. Heat dissipation hole; 84. Control shaft; 85. Blade; 86. Lever; 87. Arc-shaped slide groove; 88. Torsion spring two; 91. Positioning hole; 92. Bolt mounting port; 93. Placement groove; 94. Moving groove; 95. Arc-shaped rubber block; 96. Moving block; 97. Rubber ring. Detailed Implementation
[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0023] Please see Figures 1-7 The present invention is a thick-walled cast iron brake disc that is resistant to deformation, including a hub 1, a disc body 2 fixedly connected to the circumferential surface of the hub 1, an mounting sleeve 3 provided on the circumferential surface of the disc body 2, a bolt 7 passing through the mounting sleeves 3, a pushing piston 4 provided inside the mounting sleeve 3, a brake block 5 fixedly connected to the end of the pushing piston 4 away from the mounting sleeve 3, and a brake expansion mechanism 6 provided inside the mounting sleeve 3. The brake extension mechanism 6 includes a mounting groove 61, which is located inside the brake block 5. A push block 62 is slidably connected inside the mounting groove 61. A support shaft 63 is rotatably connected inside the mounting groove 61. A force-bearing plate 64 and a pressure plate 65 are fixedly connected to the circumferential surface of the support shaft 63. A sliding groove 66 is provided inside the mounting groove 61. An extended brake block 67 is slidably connected inside the sliding groove 66. A torsion spring 68 is fixedly connected inside the mounting groove 61. The end of the torsion spring 68 away from the mounting groove 61 is fixedly connected to the circumferential surface of the support shaft 63. A return spring 69 is fixedly connected inside the mounting groove 61. The end of the return spring 69 away from the mounting groove 61 is fixedly connected to the bottom of the extended brake block 67. The purpose of this mechanism is to increase the effective friction area by automatically extending the extended brake block 67 during braking, thereby distributing the frictional heat more evenly over a wider area of the disc 2 and reducing local high temperatures and thermal stress concentration.
[0024] There are two return springs 69 arranged in a linear array inside the mounting slot 61. The purpose is to provide a smooth and balanced return force for the extended brake block 67, ensuring that it can reliably retract in the non-braking state.
[0025] The bottom of the force plate 64 is located on the displacement trajectory of the push block 62, and the top of the extended brake block 67 is located on the displacement trajectory of the pressure plate 65. The purpose is that when the push piston 4 pushes the brake block 5 to move towards the disc 2, the push block 62 moves synchronously and pushes the force plate 64, driving the support shaft 63 to rotate, thereby causing the pressure plate 65 to press down on the extended brake block 67, thus achieving precise mechanical linkage of the extension action.
[0026] The initial position of the extended brake block 67 is larger than the distance between the brake block 5 and the disc 2 than the distance between the brake block 5 and the disc 2. The purpose is to ensure that in the initial stage of braking, the brake block 5 first contacts the disc 2 to generate braking force. When the braking force demand increases or heat accumulates, the extended brake block 67 extends to participate in the work, so as to realize the expansion of braking force and heat dissipation area as needed.
[0027] The disc body 2 is equipped with a heat dissipation mechanism 8, which includes a heat dissipation chamber 81. The heat dissipation chamber 81 is located inside the disc body 2. A heat dissipation vent 82 is provided on the circumferential surface of the disc body 2. A heat dissipation hole 83 is provided between the disc body 2 and the heat dissipation chamber 81. A control shaft 84 is rotatably connected inside the heat dissipation chamber 81. A blade 85 is fixedly connected to the circumferential surface of the control shaft 84. A lever 86 is fixedly connected to the circumferential surface of the control shaft 84. An arc-shaped groove 87 is provided on the side of the disc body 2. The circumferential surface of the lever 86 is slidably connected to the inside of the arc-shaped groove 87. A torsion spring 88 is fixedly connected inside the heat dissipation chamber 81. The end of the torsion spring 88 away from the heat dissipation chamber 81 is fixedly connected to the circumferential surface of the control shaft 84. The purpose is to use the movement of the extended brake block 67 during braking to trigger the heat dissipation mechanism 8, drive the blade 85 to rotate, forcibly agitate and promote the airflow inside the heat dissipation chamber 81, accelerate the dissipation of heat from the inside of the disc body 2 to the outside, and achieve active enhanced heat dissipation.
[0028] The number of control shafts 84, blades 85 and torsion springs 88 is set to several, and they are arranged in a circular array along the circumference of the disk body 2. The purpose is to achieve comprehensive and uniform heat dissipation of the circumferential area of the disk body 2 through the heat dissipation units distributed at multiple points, so as to avoid local heat retention.
[0029] One end of the lever 86 is located on the displacement trajectory of the extended brake block 67 after it moves. The purpose is to ensure that the extended brake block 67 can push the lever 86 when it extends, thereby driving the blade 85 to rotate, so as to achieve automatic coordination between braking action and active heat dissipation.
[0030] The wheel hub 1 is equipped with a stabilizing mounting mechanism 9, which includes a positioning hole 91 located inside the wheel hub 1. The wheel hub 1 also has a bolt mounting port 92 and a placement groove 93. A moving groove 94 is located inside the placement groove 93. An arc-shaped rubber block 95 is fixedly connected inside the placement groove 93, and a moving block 96 is fixedly connected to the circumference of the arc-shaped rubber block 95. The side of the moving block 96 is slidably connected to the inside of the moving groove 94. A rubber ring 97 is slidably connected inside the bolt mounting port 92. The purpose of this mechanism is to absorb and even out the assembly stress, vibration, and thermal deformation stress at the connection between the wheel hub 1 and the axle through an elastic buffer and stress dispersion structure, thereby reducing stress concentration at the mounting interface and suppressing deformation transmission.
[0031] The number of bolt mounting holes 92 is set to a certain extent and is arranged in a circumferential array along the circumference of the wheel hub 1. The purpose is to ensure the stability of the connection between the wheel hub 1 and the axle through high-strength bolts that are evenly distributed at multiple points.
[0032] One end of the movable block 96 extends beyond the movable groove 94 and is located inside the bolt mounting port 92. Its purpose is to allow the end of the movable block 96 to push the movable block 96 when the bolt 7 is tightened, thereby compressing the arc-shaped rubber block 95, generating a preload and filling the gap, thus forming an elastic locking and buffering mechanism.
[0033] A specific application of this embodiment is as follows: During braking, hydraulic or pneumatic drive pushes piston 4 to move towards disc 2 within mounting sleeve 3, thereby pushing brake block 5 against the surface of disc 2 to generate basic braking force. At this time, brake extension mechanism 6 begins to work in coordination. As brake block 5 moves, push block 62 fixed inside it moves forward synchronously and presses against force plate 64 located on its displacement trajectory. After force is applied to force plate 64, it drives pressure plate 65, which is fixed to the same support shaft 63, to rotate around support shaft 63. Since the initial position of extended brake block 67 is greater than the distance between the disc 2 and the brake block 67, the brake extension mechanism 67 rotates. The distance between brake block 5 and disc 2 ensures that only brake block 5 contacts and rubs during the initial braking phase. When braking continues or the braking force demand increases, the rotating pressure plate 65 presses down on the top of the extended brake block 67, overcoming the elastic force of the two return springs 69, and forcing the extended brake block 67 to slide along the groove 66 towards the disc 2 until its friction surface also contacts the disc 2. The extension of the extended brake block 67 effectively increases the friction contact area with the disc 2, dispersing the frictional heat originally concentrated in the contact area of brake block 5 to a larger area formed by the brake block 5 and the extended brake block 67.
[0034] As the extended brake block 67 extends, the heat dissipation mechanism 8 is automatically triggered. The extended brake block 67 pushes the lever 86 located in front of it along its trajectory. After the lever 86 is subjected to force, it drives the control shaft 84, which is fixedly connected to it, to rotate in the heat dissipation chamber 81, thereby driving the multiple blades 85 of the circumferential array to rotate. The rotation of the blades 85 forcibly agitates the air inside the heat dissipation chamber 81, forming forced convection. The high temperature generated inside the disc 2 due to braking is transferred to the heat dissipation chamber 81 through the heat dissipation holes 83, is quickly carried away by the flowing air, and is discharged through the heat dissipation ports 82 on the circumferential surface of the disc 2. The multiple heat dissipation units of the circumferential array ensure the uniformity of heat dissipation in the circumference of the disc 2. When the brake is released, the piston 4 is pushed back to its original position. The brake block 5 and the extended brake block 67 are retracted under the action of the return spring 69 and the torsion spring 68. The lever 86 is also reset under the restoring force of the torsion spring 88. The blades 85 stop rotating. This heat dissipation mechanism 8 uses the mechanical energy of the braking process itself to achieve the active enhanced heat dissipation effect of "braking is heat dissipation".
[0035] Meanwhile, the stable mounting mechanism 9 provides continuous stability throughout the entire operation. When installing the fastening bolt 7, the end of the bolt 7 is pressed into the bolt mounting port 92 and contacts the moving block 96. The moving block 96 slides along the moving groove 94, compressing the arc-shaped rubber block 95 connected to it. The compressed arc-shaped rubber block 95 generates elastic preload, tightly filling the micro-gap between the wheel hub 1 and the axle, and providing continuous radial clamping force. At the same time, the rubber ring 97 in the bolt mounting port 92 also plays a role in buffering and sealing. This elastic buffer system can effectively absorb and disperse the vibration stress, assembly stress, and deformation stress of the brake disc caused by thermal expansion and contraction during vehicle driving and braking. It reduces the concentration of stress at the mounting interface of the wheel hub 1 and prevents these external or internal stresses from being directly transmitted, causing additional deformation of the disc body 2, thus improving the long-term stability of the entire brake disc system under complex working conditions.
[0036] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0037] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims
1. A deformation-resistant thick-walled cast iron brake disc, characterized in that, Includes a hub (1), a disc (2) is fixedly connected to the circumferential surface of the hub (1), a mounting sleeve (3) is provided on the circumferential surface of the disc (2), a bolt (7) passes through the mounting sleeves (3), a push piston (4) is provided inside the mounting sleeve (3), a brake block (5) is fixedly connected to the end of the push piston (4) away from the mounting sleeve (3), and a brake extension mechanism (6) is provided inside the mounting sleeve (3). The brake extension mechanism (6) includes a mounting groove (61) which is located inside the brake block (5). A push block (62) is slidably connected inside the mounting groove (61). A support shaft (63) is rotatably connected inside the mounting groove (61). A force plate (64) and a pressure plate (65) are fixedly connected to the circumferential surface of the support shaft (63). A sliding groove (66) is provided inside the mounting groove (61). An extension brake block (67) is slidably connected inside the sliding groove (66). A torsion spring (68) is fixedly connected inside the mounting groove (61). One end of the torsion spring (68) away from the mounting groove (61) is fixedly connected to the circumferential surface of the support shaft (63). A return spring (69) is fixedly connected inside the mounting groove (61). One end of the return spring (69) away from the mounting groove (61) is fixedly connected to the bottom of the extension brake block (67).
2. The anti-deformation thick-walled cast iron brake disc according to claim 1, characterized in that, The number of reset springs (69) is set to two, and they are arranged in a linear array inside the mounting slot (61).
3. The anti-deformation thick-walled cast iron brake disc according to claim 2, characterized in that, The bottom of the force plate (64) is located on the displacement trajectory of the push block (62), and the top of the extended brake block (67) is located on the displacement trajectory of the pressure plate (65).
4. The anti-deformation thick-walled cast iron brake disc according to claim 3, characterized in that, The initial position of the extended brake block (67) is closer to the disc body (2) than the distance between the brake block (5) and the disc body (2).
5. A deformation-resistant thick-walled cast iron brake disc according to claim 4, characterized in that, The disk body (2) is provided with a heat dissipation mechanism (8), which includes a heat dissipation chamber (81). The heat dissipation chamber (81) is located inside the disk body (2). A heat dissipation port (82) is provided on the circumferential surface of the disk body (2). A heat dissipation hole (83) is provided between the disk body (2) and the heat dissipation chamber (81). A control shaft (84) is rotatably connected inside the heat dissipation chamber (81). A blade (85) is fixedly connected on the circumferential surface of the control shaft (84). A lever (86) is fixedly connected on the circumferential surface of the control shaft (84). An arc-shaped sliding groove (87) is provided on the side of the disk body (2). The circumferential surface of the lever (86) is slidably connected to the inside of the arc-shaped sliding groove (87). A second torsion spring (88) is fixedly connected inside the heat dissipation chamber (81). The end of the second torsion spring (88) away from the heat dissipation chamber (81) is fixedly connected to the circumferential surface of the control shaft (84).
6. A deformation-resistant thick-walled cast iron brake disc according to claim 5, characterized in that, The number of control shafts (84), blades (85) and torsion springs (88) is set to several, and they are arranged in a circular array along the circumference of the disk body (2).
7. A deformation-resistant thick-walled cast iron brake disc according to claim 6, characterized in that, One end of the lever (86) is located on the displacement trajectory of the extended brake block (67) after it moves.
8. A deformation-resistant thick-walled cast iron brake disc according to claim 7, characterized in that, The hub (1) is provided with a stable mounting mechanism (9) inside. The stable mounting mechanism (9) includes a positioning hole (91) which is opened inside the hub (1). The hub (1) is provided with a bolt mounting port (92). The hub (1) is provided with a placement groove (93). The placement groove (93) is provided with a moving groove (94). An arc-shaped rubber block (95) is fixedly connected inside the placement groove (93). A moving block (96) is fixedly connected to the circumferential surface of the arc-shaped rubber block (95). The side of the moving block (96) is slidably connected to the inside of the moving groove (94). A rubber ring (97) is slidably connected inside the bolt mounting port (92).
9. A deformation-resistant thick-walled cast iron brake disc according to claim 8, characterized in that, The number of bolt mounting holes (92) is set to several, and they are arranged in a circular array along the circumference of the hub (1).
10. A deformation-resistant thick-walled cast iron brake disc according to claim 9, characterized in that, One end of the movable block (96) extends beyond the movable groove (94) and is located inside the bolt mounting port (92).