A hydrophobic, non-stick biomimetic brake pad and its manufacturing method

Abstract

This invention discloses a hydrophobic, anti-stick, biomimetic brake pad and its manufacturing method, relating to the field of automotive friction braking technology. The hydrophobic, anti-stick, biomimetic brake pad includes a brake pad body and multiple composite biomimetic textures located on the brake pad body. Each composite biomimetic texture includes polygonal hydrophobic recesses disposed on the surface of the brake pad body for chip containment and drainage; and cylindrical protrusions located within the polygonal hydrophobic recesses. The edges of the polygonal hydrophobic recesses and the upper edges of the cylindrical protrusions respectively form cutting edges for removing deposits from the brake disc. This invention, through the design of composite biomimetic textures, resembles the microstructure of a taro leaf surface, providing hydrophobic and anti-stick properties. The polygonal hydrophobic recesses effectively contain chips and drain water, improving wear resistance. The edges of the polygonal hydrophobic recesses and the upper edges of the cylindrical protrusions act as cutting edges, removing rust and other deposits from the brake disc during braking.

Description

Technical Field

[0001] This invention relates to the field of automotive friction braking technology, and particularly to a hydrophobic, non-sticking bionic brake pad, as well as a method for manufacturing the hydrophobic, non-sticking bionic brake pad. Background Technology

[0002] New energy vehicles can brake at low speeds by recovering braking torque, and at high speeds by using a hybrid braking mode that combines regenerative braking with friction braking. Compared to traditional fuel vehicle braking systems, this significantly reduces the use of brake pads, resulting in very limited natural rust removal. Brake discs are prone to retaining corroded rust, which in turn carries dust, mud, and water, affecting the coefficient of friction, leading to asymmetrical braking torque, increased residual resistance, and increased braking noise. Therefore, maintaining a stable coefficient of friction under harsh conditions such as rust, dust, mud, dryness, and wetness, and providing highly stable and reliable braking performance across the entire range of speed, pressure, and temperature, presents a new challenge in the design and manufacturing of composite braking systems for new energy vehicles. Currently, the domestic and international new energy vehicle industry still uses brake pads and braking systems from fuel vehicles. Brake pad manufacturing largely remains on the non-textured surface, with some opting for direct texturing on the brake pad surface. However, since brake pads are not made of metal but rather pressed powder, direct surface processing results in lower texturing precision and reduced brake pad strength.

[0003] The research and improvement efforts on the braking torque distribution strategy have only addressed the aforementioned issues, with little exploration into the braking system's structure, the brake pad's working mechanism, and the manufacturing of brake pads with surface textures.

[0004] Existing methods for improving the braking stability of new energy vehicles mostly involve improvements to the vehicle's control system. For example, the invention patent with publication number CN112477610A distributes the total braking force to the front and rear wheels based on different braking intensities during each braking action, with friction braking providing additional braking force when the electric motor braking is insufficient. While this improves braking stability, it is only applicable at lower speeds. At high speeds, when the electric braking torque is insufficient and friction braking by the brake pads is still required, this method becomes ineffective. To address complex operating conditions, the invention patent with publication number CN208311335U proposes a wear-resistant and heat-dissipating racing brake pad with multiple intersecting first and second grooves for chip removal and heat dissipation. However, the groove structure mentioned in this patent only serves the purpose of chip removal and heat dissipation, improving wear resistance to a certain extent. Since it does not change the friction principle between the brake pad and the metal components, it does not significantly contribute to the stability of the friction coefficient. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the aforementioned technical problems in the prior art. To this end, embodiments of the present invention provide a biomimetic brake pad with a hydrophobic, anti-stick, and wear-resistant structure, which improves wear resistance and stability.

[0006] This invention also provides a method for manufacturing a hydrophobic, non-stick, biomimetic brake pad.

[0007] According to an embodiment of the first aspect of the present invention, a hydrophobic and non-stick biomimetic brake pad is provided, comprising a brake pad body and a plurality of composite biomimetic textures located on the brake pad body, wherein the composite biomimetic textures include polygonal hydrophobic pits disposed on the surface of the brake pad body for chip containment and drainage; and cylindrical protrusions located within the polygonal hydrophobic pits, wherein the edge of the opening of the polygonal hydrophobic pits and the upper edge of the peripheral wall of the cylindrical protrusions respectively form cutting edges for removing adhering substances from the brake disc.

[0008] The aforementioned hydrophobic and anti-stick biomimetic brake pad has at least the following beneficial effects: By designing a composite biomimetic texture, similar to the microstructure on the surface of a taro leaf, it possesses hydrophobic and anti-stick properties. The polygonal hydrophobic pits can accommodate debris and drain water, improving wear resistance. The edges of the polygonal hydrophobic pits and the upper edge of the cylindrical protrusions act as cutting edges, removing rust and other deposits from the brake disc during braking. This invention proposes preparing a composite biomimetic texture on the surface of the brake pad body. From a friction and wear mechanism perspective, the structure itself possesses hydrophobic, anti-stick, and wear-resistant properties, providing stable friction in both dry and wet environments, and also removing rust. This brake pad with a composite biomimetic texture can maintain a stable coefficient of friction and improve wear resistance and braking stability even after a period of use in new energy vehicles, due to reduced friction participation in braking and complex conditions such as residual rust on the brake disc, and the presence of dust, mud, and water.

[0009] According to an embodiment of the first aspect of the present invention, the polygonal hydrophobic recess is a regular hexagonal recess. Further, the radius R of the central inscribed circle of the polygonal hydrophobic recess is 0.8-1.8 mm, and the depth h of the polygonal hydrophobic recess is 1-2 mm. Even further, the radius r of the cylindrical protrusion is 0.5-0.7 mm.

[0010] According to an embodiment of the first aspect of the present invention, each of the composite biomimetic textures is arranged in a hexagonal array radiating from the center. Further, the vertical distance w between adjacent sides of two adjacent polygonal hydrophobic pits is 0.1-0.8 mm.

[0011] According to an embodiment of a second aspect of the present invention, a method for manufacturing a hydrophobic, non-stick, biomimetic brake pad is provided, characterized in that the method for manufacturing the hydrophobic, non-stick, biomimetic brake pad according to an embodiment of a first aspect of the present invention includes the following steps:

[0012] S1, laser etching is performed on the bottom of the concave mold of the mold to process the reverse mold corresponding to the set composite biomimetic texture;

[0013] S2, put the prepared friction material into the mixer and mix it evenly, fill the bottom of the die with the friction material and compact it;

[0014] S3, place the base material into the concave mold of the mold and press it firmly, then place the glued back plate, and then turn on the hot press to press it.

[0015] S4. After the hot-pressed brake pads are left to stand at room temperature, they are placed in a heat treatment oven for heat treatment.

[0016] S5, machining of the heat-treated brake pads;

[0017] S6. Electrostatic spraying is performed on the machined brake pads, followed by surface ablation and then surface activation to prepare a hydrophobic, non-stick biomimetic brake pad.

[0018] The aforementioned method for manufacturing hydrophobic, non-stick, biomimetic brake pads has at least the following beneficial effects: This invention proposes a novel brake pad manufacturing method, which improves the mold required for hot pressing. The bottom of the die is processed by laser etching, and a reverse mold with a surface texture corresponding to the brake pad is manufactured based on the surface texture of the brake pad. This allows brake pads with a composite biomimetic texture on the surface to be manufactured by molding. This method can press out brake pads with a composite biomimetic texture on the surface without significantly increasing manufacturing costs or complexity compared to traditional manufacturing methods. The laser etching method for processing existing molds is simple and reliable.

[0019] According to an embodiment of the second aspect of the present invention, the manufacturing method of the hydrophobic and non-stick bionic brake pad further includes step S7, which involves bonding and riveting the shock-absorbing sheet to the outer surface of the back plate of the hydrophobic and non-stick bionic brake pad, and then applying inkjet printing and riveting the alarm spring to the hydrophobic and non-stick bionic brake pad. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0021] Figure 1 This is a perspective view of an embodiment of the present invention;

[0022] Figure 2This is a perspective view of the composite biomimetic texture in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the arrangement of the composite biomimetic texture in a centrally radiating hexagonal array in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of parameter calibration for the composite biomimetic texture in an embodiment of the present invention. Detailed Implementation

[0025] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0026] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0027] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0028] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0029] In existing technologies, improving the braking stability of new energy vehicles mainly focuses on enhancing braking stability through regenerative braking distribution strategies. This includes improving brake pad wear resistance by creating wider grooves on the brake pad surface for chip removal, drainage, and heat dissipation, but the results are still unsatisfactory. However, there is little exploration into the braking system's structural design, the brake pad's operational mechanism, and the manufacturing of brake pads with surface textures.

[0030] With the continuous development of bionics, it has been discovered that many organisms possess hydrophobic, anti-sticking properties and can resist external abrasion. However, their surfaces are not smooth but rather have different geometrically non-smooth morphologies. Under sticky and wet conditions, non-smooth surfaces have the functions of reducing adhesion, desorption, and drag. For example, the surfaces of desert lizards such as the rock lizard and the chameleon lizard are not completely smooth but are non-smooth surfaces composed of scales. It is precisely the presence of these microscopic scales that gives the surfaces of these desert lizards their wear-resistant and erosion-resistant properties. Furthermore, the microstructure of taro leaf surfaces possesses hydrophobic and anti-sticking properties. This invention applies the microstructure of taro leaf surfaces to brake pads.

[0031] The following reference Figure 1 A hydrophobic, non-stick biomimetic brake pad is provided, including a brake pad body 11 and multiple composite biomimetic textures 20 located on the brake pad body.

[0032] Among them, combined Figure 2 The composite biomimetic texture 20 includes polygonal hydrophobic pits 21 and cylindrical protrusions 22.

[0033] Specifically, polygonal hydrophobic recesses 21 are provided on the surface of the brake pad body 11 for absorbing debris and draining water. Specifically, the polygonal hydrophobic recesses 21 are regular hexagonal recesses. Cylindrical protrusions 22 are located inside the polygonal hydrophobic recesses 21, and the edges of the openings of the polygonal hydrophobic recesses 21 and the upper edges of the peripheral walls of the cylindrical protrusions 22 respectively form cutting edges for removing deposits on the brake disc.

[0034] In this embodiment, each composite biomimetic texture 20 is arranged in a centrally radiating hexagonal array. That is, multiple composite biomimetic textures are arranged in a centrally radiating hexagonal array covering the entire surface of the brake pad body, as shown in the reference diagram. Figure 3 Construct a coordinate system for the planar figure, using the center of the initial regular hexagon as the origin, and further calibrate the parameters, such as... Figure 4 As shown. Specifically, the parameter calibrations for the composite biomimetic texture are as follows: the radius R of the central inscribed circle of the polygonal hydrophobic pit 21 is 0.8-1.8 mm, and the depth h of the polygonal hydrophobic pit 21 is 1-2 mm. The radius r of the cylindrical protrusion 22 is 0.5-0.7 mm. The perpendicular distance w between the two nearest sides of two adjacent polygonal hydrophobic pits 21 is 0.1-0.8 mm.

[0035] This invention, from a biomimetic perspective, studies the microstructure of taro leaf surface, which has hydrophobic and anti-stick properties, and applies this microstructure to brake pads. It is understood that in the composite biomimetic texture 20, the polygonal hydrophobic pits 21 can act as chip-retaining and drainage points, improving wear resistance; the edges of the polygonal hydrophobic pits 21 and the upper edges of the cylindrical protrusions 22 act as cutting edges, removing rust and other deposits from the brake disc during braking. It is understood that the composite biomimetic structure, formed by the relatively closely distributed hexagonal pits and protrusions after removing specific pits, does not affect the overall strength of the brake pad, while also providing chip-retaining and heat dissipation functions. In rainy conditions, the discontinuous surface structure can disrupt the water film, improving wear resistance. The structure itself prevents sticking and removes adhering substances, ensuring the removal of deposits from the brake disc, thus providing stable friction.

[0036] From the perspective of friction and wear mechanisms, the composite biomimetic texture itself possesses hydrophobic, non-stick, and wear-resistant properties, providing stable friction in both dry and wet environments, and also serving to remove rust. Brake pads with this composite biomimetic texture can maintain a stable coefficient of friction even after a period of use in new energy vehicles, due to reduced friction-based braking and complex conditions such as residual rust on the brake discs, along with dust, mud, and water. This provides highly stable and reliable braking performance across the entire range of speed, pressure, and temperature.

[0037] This invention also provides a method for manufacturing a hydrophobic, non-stick, biomimetic brake pad, comprising the following steps:

[0038] S1, laser etching is performed on the bottom of the concave mold of the mold to process the reverse mold corresponding to the set composite biomimetic texture 20.

[0039] S2, put the prepared friction material into the mixer and mix it evenly, fill the bottom of the die with the friction material and compact it.

[0040] S3. Place the base material into the concave mold of the mold and press it firmly. Then place the glued back plate on the mold and press it in the pressing mode of the hot press.

[0041] S4. After the hot-pressed brake pads are left to stand at room temperature, they are placed in a heat treatment oven for heat treatment.

[0042] S5, machining of the heat-treated brake pads.

[0043] S6. Electrostatic spraying is performed on the machined brake pads, followed by surface ablation and then surface activation to prepare a hydrophobic, non-stick biomimetic brake pad.

[0044] S7, the shock-absorbing pads are bonded and riveted on the outer surface of the back plate of the hydrophobic and non-stick bionic brake pad, and then the hydrophobic and non-stick bionic brake pads are marked with inkjet printing and riveted with alarm spring clips.

[0045] Understandably, traditional brake pad manufacturing methods cannot produce brake pads with a composite biomimetic texture on the surface. This invention proposes a new brake pad manufacturing method, which improves the mold required for hot pressing. The bottom of the die is processed by laser etching. Based on the surface texture of the brake pad, a reverse mold with a corresponding surface texture is created, enabling the production of brake pads with a composite biomimetic texture through molding. This method can produce brake pads with a composite biomimetic texture on the surface without significantly increasing manufacturing costs or complexity compared to traditional methods. The laser etching method for processing existing molds is simple and reliable.

[0046] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A hydrophobic, non-stick, biomimetic brake pad, characterized in that: It includes a brake pad body and multiple composite biomimetic textures located on the brake pad body, wherein the composite biomimetic textures include Polygonal hydrophobic recesses are provided on the surface of the brake pad body for chip collection and drainage; and A cylindrical protrusion is located within the polygonal hydrophobic recess. The edge of the opening of the polygonal hydrophobic recess and the upper edge of the peripheral wall of the cylindrical protrusion are respectively formed with cutting edges to remove the adhering substances on the brake disc. The polygonal hydrophobic pit is a regular hexagonal pit, the radius R of the inscribed circle of the polygonal hydrophobic pit is 0.8-1.8mm, the depth h of the polygonal hydrophobic pit is 1-2mm, and the radius r of the cylindrical protrusion is 0.5-0.7mm.

2. The hydrophobic, non-stick, biomimetic brake pad according to claim 1, characterized in that: Each of the aforementioned composite biomimetic textures is arranged in a hexagonal array radiating from the center.

3. The hydrophobic, non-stick, biomimetic brake pad according to claim 2, characterized in that: The vertical distance w between the two adjacent sides of two adjacent polygonal hydrophobic pits is 0.1-0.8 mm.

4. A method for manufacturing a hydrophobic, non-stick, biomimetic brake pad, characterized in that, The method for manufacturing the hydrophobic, non-stick, biomimetic brake pad according to any one of claims 1 to 3 includes the following steps: S1, laser etching is performed on the bottom of the concave mold of the mold to process the reverse mold corresponding to the set composite biomimetic texture; S2, put the prepared friction material into the mixer and mix it evenly, fill the bottom of the die with the friction material and compact it; S3, place the base material into the concave mold of the mold and press it firmly, then place the glued back plate, and then turn on the hot press to press it. S4. After the hot-pressed brake pads are left to stand at room temperature, they are placed in a heat treatment oven for heat treatment. S5, machining of the heat-treated brake pads; S6. Electrostatic spraying is performed on the machined brake pads, followed by surface ablation and then surface activation to prepare a hydrophobic, non-stick biomimetic brake pad.

5. The manufacturing method of the hydrophobic, non-stick, biomimetic brake pad according to claim 4, characterized in that: The manufacturing method of the hydrophobic and non-stick bionic brake pad further includes step S7, which involves bonding and riveting the shock-absorbing sheet to the outer surface of the back plate of the hydrophobic and non-stick bionic brake pad, and then applying inkjet printing and riveting the alarm spring to the hydrophobic and non-stick bionic brake pad.

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