Carbon ceramic brake pair for heavy truck

Abstract

The invention relates to the technical field of automobile parts, and discloses a carbon ceramic brake pair for a heavy truck, which comprises a brake disc and two groups of friction linings, and the brake disc is positioned between the two groups of friction linings; each group of friction linings comprises two friction plates, and when the friction plates are in contact with the brake disc, friction braking is carried out; the brake disc is made of a carbon ceramic material, and the heat dissipation piece is arranged on the friction lining. The carbon-ceramic brake disc is matched with the powder metallurgy friction plate, the staggered structure of the key grooves and the through holes and the heat dissipation channels are combined, the high temperature resistance, the structural stability and the heat dissipation efficiency of the brake pair are remarkably improved, the brake pair is suitable for severe working conditions such as heavy loads and long downhill slopes, the weight of a brake is reduced, and the friction area is increased; and the maximum friction braking temperature is reduced.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, and in particular to a carbon-ceramic brake pair for heavy-duty trucks. Background Technology

[0002] Carbon-ceramic composite materials are a type of brake material that has developed rapidly in recent years, following powder metallurgy materials and carbon / carbon brake materials. These materials are lightweight (specific gravity 2.0–2.4 g / cm³). 3 Carbon-ceramic composite materials (containing only about 30% of the material of cast steel brake discs) are highly resistant to high temperatures and wear, have a high and stable coefficient of friction, are insensitive to humid environments in terms of braking performance, possess excellent oxidation resistance, and have a long service life. These advantages have led to their widespread use in aircraft brakes, perfectly solving the shortcomings of existing cast steel brake discs. It is foreseeable that carbon-ceramic brake discs will gradually replace cast steel brake discs in the future.

[0003] Studies have shown that, in scaled-down braking friction experiments, the combination of powder metallurgy blocks and carbon ceramic discs not only exhibits a higher overall friction coefficient but also shows less friction coefficient decay with speed and higher frictional stability. The friction coefficient stability factor is 0.908 across the initial velocity range from low to high speeds, higher than the 0.895 of a steel disc. Wear tests show that the brake pads paired with the carbon ceramic discs have a maximum wear rate of 0.147 cm. 3 / MJ, while the wear of the mating part with the steel disc reached 0.338cm. 3 / MJ, which is 2.3 times that of the carbon ceramic disc pair. Observing the friction surface of the brake pads, when paired with the carbon ceramic disc, the surface is slightly damaged after high-speed braking, maintaining a high friction area, thus the friction coefficient decreases less.

[0004] Most existing automotive braking materials are powder metallurgy brake pads. Their braking principle involves absorbing the kinetic energy of the vehicle through friction between the powder metallurgy pad and the cast steel brake disc, thus achieving deceleration. Carbon ceramic brake materials, due to their inherent high strength, low density, and high heat resistance, are currently fixed to the automotive braking system using fasteners.

[0005] Therefore, there is an urgent need for a carbon-ceramic brake pair for heavy-duty trucks to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a carbon-ceramic brake pair for heavy trucks, which reduces the weight of the brake and lowers the maximum temperature of friction braking.

[0007] To achieve the above objectives, the present invention provides the following solution: The present invention provides a carbon ceramic brake pair for heavy trucks, comprising: A brake disc and two sets of friction pads, wherein the brake disc is located between the two sets of friction pads; Each set of friction pads includes two friction pads, which perform friction braking when the friction pads contact the brake disc; The brake disc is made of carbon ceramic. A heat sink is disposed on the friction liner.

[0008] According to the present invention, a carbon ceramic brake pair for heavy trucks is provided, wherein a retaining ring and a connecting member are installed on the brake disc by bolt sleeve.

[0009] According to the present invention, a carbon-ceramic brake pair for heavy trucks is provided, wherein a plurality of first through holes and a plurality of keyways are provided on the inner side of the brake disc, and the plurality of first through holes and the plurality of keyways are staggered along the circumference of the brake disc.

[0010] According to the present invention, a carbon-ceramic brake pair for heavy trucks is provided, wherein the connector is provided with a plurality of second through holes and a plurality of external keys, the plurality of second through holes and the plurality of external keys are staggered along the circumference of the connector, the plurality of first through holes correspond one-to-one with the plurality of second through holes, and the plurality of keyways correspond one-to-one with the plurality of external keys.

[0011] According to the present invention, a carbon-ceramic brake pad for heavy trucks includes a friction plate comprising a pressed blank and a steel backing, wherein the pressed blank is fixedly connected to the steel backing, and a transition layer is provided between the pressed blank and the steel backing.

[0012] According to the present invention, a carbon ceramic brake pair for heavy trucks is provided, wherein the pressed blank is formed by pressing powder metallurgy friction material and sintering it onto the steel backing under pressure.

[0013] According to the present invention, a carbon ceramic brake pair for heavy trucks is provided, wherein both the pressed blank and the steel backing are fan-shaped structures, and the side length of the pressed blank is smaller than the side length of the steel backing.

[0014] According to the present invention, a carbon ceramic brake pair for heavy trucks has two protruding keys on the steel back.

[0015] According to the present invention, a carbon-ceramic brake assembly for heavy trucks includes a heat dissipation channel disposed on the pressed blank.

[0016] According to the present invention, a carbon ceramic brake pair for heavy trucks is provided, wherein the retaining ring is provided with a plurality of third through holes, and the plurality of third through holes correspond one-to-one with a plurality of first through holes.

[0017] Compared with the prior art, the present invention has the following advantages and technical effects: This invention provides a carbon-ceramic brake pair for heavy-duty trucks, which uses a carbon-ceramic brake disc and a powder metallurgy liner. It is lightweight, heat-resistant, has a stable coefficient of friction, and high braking efficiency. The alternating arrangement of multiple discs increases the friction area, reduces the energy load per unit area, and reduces the maximum braking temperature. The multi-layer staggered arrangement of heat dissipation components enhances heat dissipation capacity and extends service life. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described 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. Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the friction liner structure of the present invention; Figure 3 For the present invention Figure 2 Sectional view of AA; Figure 4 This is a schematic diagram of the heat dissipation channel structure of the present invention; Figure 5 For the present invention Figure 4 Sectional view of AA; Figure 6 This is a schematic diagram of the brake disc structure of the present invention; Figure 7 This is a schematic diagram of the connector structure of the present invention; Figure 8 This is a schematic diagram of the retaining ring structure of the present invention; Figure 9 This is a schematic diagram of the bolt sleeve structure of the present invention; Among them, 1. Friction lining; 2. Retaining ring; 3. Brake disc; 4. Bolt sleeve; 5. Connector; 6. Steel back; 7. Pressed blank; 8. Raised key; 9. Heat dissipation channel; 10. Third through hole; 11. First through hole; 12. Keyway; 13. Second through hole; 14. External key. Detailed Implementation

[0019] 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.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Reference Figures 1-9 This invention provides a carbon-ceramic brake pair for heavy-duty trucks, comprising: A brake disc 3 and two sets of friction pads 1, with the brake disc 3 located between the two sets of friction pads 1; Each set of friction pads includes two friction pads, which perform friction braking when they contact the brake disc 3. Brake disc 3 is made of carbon ceramic. The heat sink is mounted on the friction pad 1.

[0022] In one embodiment of the present invention, carbon-ceramic material is applied to heavy-duty truck brake discs and matched with powder metallurgy friction pads. Carbon-ceramic material has advantages such as low density, high temperature resistance, and wear resistance, effectively achieving brake disc weight reduction, improving the thermal stability and anti-fading performance of the brake assembly, and extending its service life. The added heat dissipation components further enhance the heat dissipation capacity of the entire system under frequent, high-intensity braking conditions of heavy-duty trucks, ensuring continuous and stable braking performance.

[0023] As an optional implementation, a retaining ring 2 and a connecting piece 5 are mounted on the brake disc 3 via a bolt sleeve 4.

[0024] In one embodiment of the present invention, this design achieves symmetrical and balanced heat dissipation on both sides of the brake disc, avoiding uneven heating of the brake disc and potential thermal stress deformation (such as disc warping) caused by heat dissipation on one side, thereby ensuring the smoothness of the braking process and further extending the service life of the brake disc and friction pads.

[0025] As an optional implementation, the brake disc 3 has a plurality of first through holes 11 and a plurality of keyways 12 on its inner side, and the plurality of first through holes 11 and the plurality of keyways 12 are staggered along the circumference of the brake disc 3.

[0026] As an optional implementation, the connector 5 is provided with a plurality of second through holes 13 and a plurality of external keys 14. The plurality of second through holes 13 and the plurality of external keys 14 are staggered along the circumference of the connector 5. A plurality of first through holes 11 correspond one-to-one with a plurality of second through holes 13, and a plurality of keyways 12 correspond one-to-one with a plurality of external keys 14.

[0027] In one embodiment of the present invention, to ensure installation stability and torsional strength, a plurality of first through holes 11 and a plurality of keyways 12 are provided on the inner side of the brake disc 3. The plurality of first through holes 11 and the plurality of keyways 12 are staggered along the circumference of the brake disc 3. Correspondingly, a plurality of second through holes 13 and a plurality of external keys 14 are provided on the connector 5. The plurality of second through holes 13 and the plurality of external keys 14 are staggered along the circumference of the connector 5. During installation, the plurality of first through holes 11 and the plurality of second through holes 13 correspond one-to-one to mate with the bolt sleeve 4; the plurality of keyways 12 and the plurality of external keys 14 correspond one-to-one to transmit torque through keyed connection, preventing the connector 5 from rotating relative to the brake disc 3.

[0028] As an optional implementation, the friction plate includes a blank 7 and a steel back 6, the blank 7 is fixedly connected to the steel back 6, and a transition layer is provided between the blank 7 and the steel back 6.

[0029] In one embodiment of the present invention, the design of the transition layer promotes the interdiffusion of atoms / molecules between metals. Furthermore, pressure sintering is adopted to improve the density of the friction body, enhance the bonding strength between the steel back of the friction block and the friction material layer after sintering, improve the shear resistance and impact resistance of the two, and have high mechanical strength. This effectively avoids phenomena such as slag shedding, block shedding, and detachment caused by low mechanical strength, and improves the service life of the friction lining.

[0030] As an alternative implementation, the compact 7 is formed by pressing powder metallurgy friction material and sintering it onto the steel backing 6 under pressure.

[0031] In one embodiment of the present invention, a pressure sintering process is used to form a strong metallurgical bond between the powder metallurgy friction material and the steel backing. This bonding method significantly improves the bonding strength between the friction material and the substrate, avoids material spalling caused by high temperature or stress impact during use, and ensures the overall structural integrity and heat transfer efficiency of the friction plate.

[0032] As an optional implementation, both the pressed billet 7 and the steel back 6 have a fan-shaped structure, and the side length of the pressed billet 7 is smaller than the side length of the steel back 6.

[0033] In one embodiment of the present invention, the friction pad has a fan-shaped structure, which makes it easier to use and maintain. It can provide uniform frictional contact pressure, ensuring smooth braking without vibration. At the same time, this shape is conducive to the full utilization of materials and reduces waste. Its structure also facilitates reasonable arrangement in the circumferential direction to maximize the friction area.

[0034] As an optional implementation, the steel back 6 is provided with two protruding keys 8.

[0035] In one embodiment of the present invention, a convex key 8 connection method is used to achieve rapid installation, positioning, and replacement of the friction pads, greatly improving maintenance convenience. This connection structure is simple and reliable, can effectively transmit braking force, and allows for a small radial thermal expansion space for the friction pads, preventing jamming.

[0036] As an optional implementation, the heat sink includes a heat dissipation channel 9 disposed on the blank 7.

[0037] In one embodiment of the present invention, the heat dissipation channel 9 provided on the blank 7 effectively enhances heat dissipation, reduces the risk of thermal fatigue, and also has the functions of removing grinding debris and reducing weight.

[0038] As an optional implementation, the retaining ring 2 is provided with a plurality of third through holes 10, and the plurality of third through holes 10 correspond one-to-one with the plurality of first through holes 11.

[0039] In one embodiment of the present invention, the third through hole 10 is aligned with the first through hole 11.

[0040] This invention employs an integrally movable carbon-ceramic brake pad, reducing brake weight, increasing friction area, lowering energy load per unit area, and reducing maximum brake temperature, thereby extending service life. Compared to cast steel discs, carbon-ceramic discs are inherently lightweight, heat-resistant, highly wear-resistant, have a high and stable coefficient of friction, are insensitive to humid environments, and possess excellent oxidation resistance. Compared to existing friction pairs of powder metallurgy discs paired with cast steel brake discs, the friction pair of powder metallurgy discs paired with carbon-ceramic brake discs provided by this invention not only exhibits higher stability and a higher average coefficient of friction, and a better high-temperature thermal fade effect, but also shows significantly lower high-speed wear than cast steel discs, resulting in higher braking efficiency and therefore a longer service life. The friction pads are all fan-shaped structures, connected to the outside via external convex keys on the steel back of the friction lining, facilitating disassembly and assembly, and making use and maintenance more convenient. The transition layer design promotes interdiffusion of atoms / molecules between metals. Further pressure sintering enhances the density of the friction body, strengthening the bond between the steel backing of the friction block and the friction material layer after sintering. This improves their shear and impact resistance, resulting in high mechanical strength and effectively preventing slag shearing, chipping, and detachment caused by insufficient mechanical strength, thus extending the service life of the friction lining. The heat dissipation channels on the friction lining effectively enhance heat dissipation, reducing the risk of thermal fatigue, and also help remove wear debris and reduce weight.

[0041] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0042] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A carbon-ceramic brake pair for heavy-duty trucks, characterized in that, include: A brake disc (3) and two sets of friction pads (1), wherein the brake disc (3) is located between the two sets of friction pads (1); Each set of friction pads includes two friction pads, which perform friction braking when they contact the brake disc (3); The brake disc (3) is made of carbon ceramic. A heat dissipation component is disposed on the friction liner (1).

2. The carbon-ceramic brake pair for heavy trucks according to claim 1, characterized in that: The brake disc (3) is fitted with a retaining ring (2) and a connector (5) via a bolt sleeve (4).

3. The carbon-ceramic brake pair for heavy trucks according to claim 2, characterized in that: The brake disc (3) has multiple first through holes (11) and multiple keyways (12) on its inner side, and the multiple first through holes (11) and multiple keyways (12) are staggered along the circumference of the brake disc (3).

4. The carbon-ceramic brake pair for heavy trucks according to claim 3, characterized in that: The connector (5) has multiple second through holes (13) and multiple external keys (14). The multiple second through holes (13) and multiple external keys (14) are staggered along the circumference of the connector (5). The multiple first through holes (11) correspond one-to-one with the multiple second through holes (13), and the multiple keyways (12) correspond one-to-one with the multiple external keys (14).

5. A carbon-ceramic brake pair for heavy trucks according to claim 1, characterized in that: The friction plate includes a blank (7) and a steel back (6). The blank (7) is fixedly connected to the steel back (6), and a transition layer is provided between the blank (7) and the steel back (6).

6. A carbon-ceramic brake pair for heavy trucks according to claim 5, characterized in that: The pressed blank (7) is formed by pressing powder metallurgy friction material and sintering it onto the steel back (6) under pressure.

7. A carbon-ceramic brake pair for heavy trucks according to claim 5, characterized in that: Both the pressed blank (7) and the steel back (6) are fan-shaped structures, and the side length of the pressed blank (7) is smaller than the side length of the steel back (6).

8. A carbon-ceramic brake pair for heavy trucks according to claim 5, characterized in that: Two protruding keys (8) are provided on the steel back (6).

9. A carbon-ceramic brake pair for heavy trucks according to claim 5, characterized in that: The heat dissipation component includes a heat dissipation channel (9) disposed on the pressed blank (7).

10. A carbon-ceramic brake pair for heavy trucks according to claim 3, characterized in that: The retaining ring (2) has multiple third through holes (10), and the multiple third through holes (10) correspond one-to-one with the multiple first through holes (11).

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