Special inner eight-speed five-hole disc

Abstract

The utility model relates to the technical field of bicycle brake discs, and discloses an inner eight-speed five-hole special disc which comprises a disc body, lightening holes, heat dissipation holes, screw holes, protruding parts and friction increasing agents, the screw holes are located in the inner side of the disc body and evenly distributed around the center of the disc, the lightening holes are formed in the outer sides of the screw holes, and the heat dissipation holes are formed in the outer sides of the screw holes. The disc body is provided with a plurality of lightening holes, each lightening hole is provided with a protruding part, the protruding parts comprise first protruding parts and second protruding parts, the second protruding parts are located on the inner side of the disc body, in the clockwise direction of the lightening holes, the first lightening holes are located on the outer side of the disc body and correspond to the two sides of the lightening holes, friction increasing agents are arranged on the outer sides of the lightening holes, and annular concave-convex textures are arranged on the surface of the disc body. The friction increasing agent and the concave-convex textures are used in cooperation, the friction increasing agent increases the friction coefficient of the surface, the concave-convex textures increase the friction area, the brake force is increased while the disc is kept small, and the stress distribution of the disc is more uniform due to the arrangement of the protruding parts.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycle disc brake discs, in particular to a special disc disc with five holes for inner eight-speed. Background Art

[0002] The origin of bicycle disc brakes was not applied on bicycles at the beginning, but was first applied on cars and motorcycles. In the 1970s, with the rise of mountain bikes, the disc brake system began to show its unique advantages. Mountain bikes often face complex and harsh riding environments, and the disc brake system can provide stable braking performance in slippery and muddy conditions. With the continuous advancement of technology, bicycle disc brake systems have been significantly improved. The emergence of mechanical disc brakes and hydraulic disc brakes has greatly improved the performance and reliability of disc brakes. Hydraulic disc brakes transmit liquids, making the braking force more uniform and easier to control, while reducing noise and difficulty in debugging. In addition, with the advancement of material science and engineering technology, the material and design of disc brake discs have also been optimized, further improving their wear resistance and braking effect. These technological advances have significantly improved the braking performance, reliability and durability of bicycle disc brakes.

[0003] However, the existing technology also has some shortcomings. In pursuit of light weight and low cost, brake discs are usually made of metal with lower density, and the size of brake discs has become smaller and smaller. The small size brings many problems, such as insufficient braking force. The small disc has a small braking area during friction with the brake pads, and the braking force it can provide is also relatively limited. It is very likely to be dangerous in some situations where strong braking is required. Moreover, the lightweight disc does not have too much structural redundancy. When braking strongly, the disc itself may face the problem of stress concentration, which will accelerate the metal fatigue of the disc, and may even cause the disc to break. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides a five-hole special disc for an inner eight-speed transmission, which has the advantages of small size and strong braking force, and solves the problem of insufficient braking force of a small disc.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose of small size and strong braking force, the utility model provides the following technical solutions: a special five-hole disc for internal eight-speed, comprising a disc body, weight-reducing holes, heat dissipation holes, screw holes, protrusions and friction-increasing agents, the screw holes being located inside the disc body and evenly distributed around the center of the disc, the weight-reducing holes being arranged outside the screw holes, and the number of the weight-reducing holes being consistent with that of the screw holes, the protrusions comprising a first protrusion and a second protrusion, the second protrusion being located inside the disc body, and in the clockwise direction of the weight-reducing holes, the first protrusion being located outside the disc body, corresponding to the two sides of the weight-reducing holes, the weight-reducing holes having friction-increasing agents in the clockwise direction, and the surface of the disc body having an annular concave-convex texture.

[0008] Preferably, the friction-increasing agent is columnar and fixedly installed in an opening outside the weight-reducing hole.

[0009] Preferably, the heat dissipation holes are grouped into three, with a total of five groups evenly distributed between the weight-reducing holes.

[0010] Preferably, the concave-convex texture is arranged in a ring shape and is symmetrically distributed on both sides of the disc body.

[0011] Preferably, the friction enhancing agent has a red coating inside.

[0012] (III) Beneficial effects

[0013] Compared with the prior art, the utility model provides a five-hole special disc for inner eight-speed, which has the following beneficial effects:

[0014] 1. The inner eight-speed five-hole special disc has a friction enhancer arranged on the outside of the weight-reducing hole. During the use of the disc, the friction enhancer is worn away by the constant friction between the brake pad and the disc, and becomes tiny hard solid particles. As the brake pad rotates, the particles adhere to the surface of the disc. These particles have high hardness and strength, and produce plowing effect and bonding effect when in contact with the dual friction surface to increase friction. The friction enhancer is embedded in the groove of the disc in a columnar form, and can provide an additional source of friction for the disc throughout its life cycle, effectively improving the braking effect of the disc. The friction enhancer is installed in a columnar shape in the opening outside the weight-reducing hole, and there is a red coating on the upper and lower ends of the friction enhancer. As the disc and the brake pad rub, the friction enhancer is constantly worn away. When the red coating is worn away, it means that the service life of the disc has been exhausted. At this time, the small solid particles of the red coating worn away adhere to the entire disc, and the color is bright, which can intuitively remind the user of the current state of the disc, and remind the user to replace the disc as soon as possible to avoid the risk of continuing to use the disc.

[0015] 2. The inner eight-speed five-hole special disc has an annular concave-convex texture on the surface of the disc. When used with a brake pad with the same concave-convex texture, the friction area between the disc and the brake pad is increased without increasing the volume of the disc, thereby improving the braking force. In addition, the simultaneous use of the friction increasing agent set therein increases both the friction area and the friction coefficient, greatly improving the braking effect of the disc and ensuring safety during riding. At the same time, the disc with an uneven surface can also help to discharge impurities contaminated by riding on the surface through the heat dissipation holes when braking.

[0016] 3. The five-hole special disc for the inner eight-speed is equipped with a second protrusion at the weight-reducing hole on the inner side of the disc in a clockwise direction. On the outer side of the disc, there is a first protrusion corresponding to it. Through the cooperation of the two, the original stress distribution pattern of the disc is broken, making the stress distribution more uniform and dispersed, which can extend the service life of the disc, improve the braking performance, and reduce the safety problems caused by stress concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the concave-convex texture of the utility model;

[0019] Figure 3 It is a schematic diagram of the friction increasing agent of the utility model.

[0020] In the figure: 1-disc body, 2-weight reduction hole, 3-heat dissipation hole, 4-screw hole, 5-first protrusion, 6-second protrusion, 7-friction enhancer, 8-concave-convex texture, 9-red coating. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "left", "right", "front", "back", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] See also Figure 1 , a five-hole special disc for an inner eight-speed engine comprises a disc body 1, a weight-reducing hole 2, a heat dissipation hole 3, a protrusion and a friction-increasing agent 7. There are five screw holes 4, which are evenly distributed on the inner side of the disc to fix the disc. A weight-reducing hole 2 is correspondingly arranged on the outer side of the screw hole 4. The weight-reducing hole 2 is arc-shaped as a whole. While reducing the weight, such a shape structure also leaves enough margin for the connection part between the screw hole 4 and the disc, thereby ensuring the connection strength between the screw hole 4 and the disc. In the clockwise direction of the weight-reducing hole 2, there is a friction-increasing agent 7. The friction-increasing agent 7 is columnar as a whole and is installed in the opening of the disc body 1. The main component of the friction-increasing agent 7 is diamond jade, which is low in price and has a good friction-increasing effect. When the disc and the brake pad are frictionally braked, the surface of the friction-increasing agent 7 is subjected to friction and becomes finer hard solid small particles. As the brake pad rotates, it adheres to the surface of the disc. These particles have high hardness and strength, and produce plowing effect and bonding effect when in contact with the dual friction surface to increase the friction force. During the whole life cycle of the disc The disc can provide an additional source of friction for the disc, effectively ensuring that the braking force of the disc will not decline. There are heat dissipation holes 3 on the disc body 1. The heat dissipation holes 3 are grouped into three groups, and a total of five groups are evenly distributed between the weight-reducing holes 2. The design of the heat dissipation holes 3 can increase the contact area between the disc and the air, and take away the heat on the disc through air flow, thereby improving the heat dissipation effect, thereby keeping the temperature of the disc within an acceptable range and ensuring its normal operation. At the same time, the design of the heat dissipation holes 3 can change the natural frequency of the disc and avoid the resonance point, thereby achieving the purpose of reducing noise and vibration during braking. On the inner side of the disc body 1, there is a second protrusion 6 in the counterclockwise direction of the weight-reducing hole 2, and on the outer side of the disc there is a first protrusion 5. The first protrusions 5 are grouped into two groups and evenly distributed on both sides of the outer side of the weight-reducing hole 2. The design of the protrusions breaks the original stress distribution pattern of the disc. Through this design, when the disc is braked, the stress is no longer concentrated in a specific area, but can be distributed more evenly and dispersedly on the entire disc. In this way, the wear degree of the disc will be greatly reduced under long-term and high-intensity use, thereby significantly extending the service life of the disc. At the same time, due to the more uniform stress distribution, the braking performance has also been significantly improved. Both the braking effect and braking stability have been effectively guaranteed, and the safety problems caused by stress concentration have been avoided.

[0024] See also Figure 1 and Figure 2There are evenly distributed concave-convex textures 8 on the surface of the disc, and the concave-convex textures 8 are symmetrically distributed on both sides of the disc body 1. When used with a brake pad with the same texture, the brake pad and the disc can fit perfectly during braking. This design increases the friction area between the disc and the brake pad without changing the volume of the disc, and improves the braking force. The concave-convex texture also solves the problem of impurity adhesion on the surface of the disc. When braking, the brake pad and the disc fit tightly. Compared with the flat surface, the broken line texture is less likely to retain impurities. The attached impurities are discharged from the surface of the disc through the heat dissipation holes as the friction of the brake pad and the rotation of the disc, ensuring that the disc can have good braking force in any environment.

[0025] See also Figure 1 and Figure 3 The friction enhancer 7 is columnar as a whole, and its cross-sectional shape is the same as the shape of the disc slot. The friction enhancer 7 consists of three parts, namely, the friction enhancers on the upper and lower sides, the red coating 9 and the metal part in the middle, wherein the metal part is fixedly connected to the disc body 1. When the brake friction occurs between the brake pad and the disc, the surface of the friction enhancer 7 is subjected to friction and becomes small solid particles attached to the surface of the disc, thereby increasing the friction coefficient between the brake pad and the disc. As the disc and the friction enhancer continue to wear, the thickness continues to decrease. When the red coating 9 in the friction enhancer is exposed, the friction turns the red coating 9 into red particles attached to the surface of the disc, making the surface of the disc red, thereby reminding the user that the disc is exhausted and needs to be replaced as soon as possible, thereby avoiding the risks brought by the continued use of the disc.

[0026] Working principle: the disc is fixedly installed on the hub of the bicycle through the screw hole 4 in the specified direction. When riding, the heat dissipation hole 3 drives the air flow on both sides of the disc, reduces the temperature of the disc, and avoids the thermal attenuation of the braking force. The friction-enhancing agent 7 is subjected to the friction between the brake pad and the disc, and a layer of its surface becomes hard solid small particles, which adhere to the surface of the disc as the disc rotates, thereby increasing the friction coefficient between the brake pad and the disc. The disc surface is composed of annular concave-convex texture 8, which is matched with the brake pad with the same concave-convex texture 8, thereby increasing the friction area between the two. With the use of the friction-enhancing agent, the braking force is greatly improved. There is a red coating 9 inside the columnar friction-enhancing agent 7. As the disc rubs, the red coating 9 inside the friction-enhancing agent 7 is exposed to the surface and becomes small red particles due to friction. The entire surface of the disc will turn red, thereby reminding the user that the life of the disc has been exhausted and needs to be replaced as soon as possible.

[0027] In summary, the inner eight-speed five-hole special disc has a friction enhancer 7 arranged in the clockwise direction of the weight-reducing hole 2. During the use of the disc, the friction enhancer 7 is worn away by the continuous friction between the brake pad and the disc, and becomes fine hard solid particles. As the brake pad rotates, it adheres to the surface of the disc. These particles have high hardness and strength, and produce a plowing effect and an adhesion effect when in contact with the dual friction surface to increase the friction. The friction enhancer 7 is embedded in the groove of the disc in a columnar form, and can provide additional friction for the disc during its entire life cycle. The friction source outside the disc is effectively improved. The friction enhancer is columnar and installed in the opening outside the weight-reducing hole. There are red coatings at the upper and lower ends of the friction enhancer. With the friction between the disc and the brake pad, the friction enhancer 7 is constantly worn away. When the red coating 9 is worn away, it means that the service life of the disc has been exhausted. At this time, the small solid particles of the red coating worn away are attached to the entire disc, and the color is bright, which can intuitively remind the user of the current state of the disc and remind the user to replace the disc as soon as possible to avoid the risk of continuing to use the disc. The disc surface is provided with an annular concave-convex texture 8. When used with a brake pad with the same concave-convex texture 8, the friction area between the disc and the brake pad is increased without increasing the volume of the disc, and the braking force is improved. In addition, the synchronous use of the friction enhancer 7 arranged therein increases the friction area and the friction coefficient, greatly improving the braking effect of the disc and ensuring the safety during riding. At the same time, the disc with an uneven surface also helps to discharge impurities on the surface due to riding through the heat dissipation holes during braking. A second protrusion 6 is provided at the weight-reducing hole 2 in the clockwise direction on the inner side of the disc, and a first protrusion 5 is provided on the outer side of the disc corresponding thereto. Through the cooperation of the two, the original stress distribution pattern of the disc is broken, making the stress distribution more uniform and dispersed, which can extend the service life of the disc, improve the braking performance, and reduce the safety problems caused by stress concentration.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A five-hole special disc for an internal eight-speed transmission, comprising a disc body (1), a weight-reducing hole (2), a heat dissipation hole (3), a screw hole (4), a protrusion and a friction-enhancing agent (7), characterized in that: The screw holes (4) are located on the inner side of the disc body (1) and are evenly distributed around the center of the disc. The weight-reducing holes (2) are arranged on the outer side of the screw holes (4) and the number of the holes is the same as that of the screw holes (4). The protrusions include a first protrusion (5) and a second protrusion (6). The second protrusion (6) is located on the inner side of the disc body (1). In the clockwise direction of the weight-reducing hole (2), the first protrusion (5) is located on the outer side of the disc body (1) and corresponds to the second protrusion (6). The weight-reducing hole (2) has a friction enhancer (7) in the clockwise direction. The surface of the disc body (1) has an annular concave-convex texture (8).

2. The five-hole special disc for inner eight-speed according to claim 1, characterized in that: The friction increasing agent (7) is columnar and is fixedly installed in the opening of the weight reducing hole (2) in the clockwise direction.

3. The five-hole special disc for inner eight-speed according to claim 1, characterized in that: The heat dissipation holes (3) are grouped into three, with a total of five groups evenly distributed between the weight-reducing holes (2).

4. The five-hole special disc for inner eight-speed according to claim 1, characterized in that: The concave-convex texture (8) is arranged in a ring shape and is symmetrically distributed on both sides of the disc body (1).

5. The five-hole special disc for inner eight-speed according to claim 1, characterized in that: The friction enhancing agent (7) has a red coating (9) inside.

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