KR101984056B1 - A brake pad spring and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a brake pad spring and a manufacturing method thereof, and more particularly, to a brake pad spring which is positioned between a pad provided on a brake braking device and a caliper to assist sliding of the pad and to prevent a surface of the caliper from being rubbed when the brake is operated, and a manufacturing method thereof. The brake pad spring is positioned between the pad provided on the brake braking device and the caliper to assist sliding of the pad and to prevent the surface of the caliper from being rubbed when the brake is operated. The brake pad spring comprises: an adhering portion adhering between the pad and the caliper; at least one pair of coupling portions formed on both sides of the adhering portion and provided between the pad and the caliper; at least one pair of guide portions formed in the coupling portion and guiding the pad; a support portion formed in the guide portion and supporting the pad; and, a coating layer formed on at least one surface selected among the adhering portion, the coupling portion, the guide portion and the support portion, wherein the coating layer is at least one selected among a solid lubricating coating layer and an elastic coating layer, thereby providing the brake pad spring and the manufacturing method thereof. According to the present invention, the life of the pad spring can be prolonged by forming the solid lubricating coating layer or the elastic coating layer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to brake pad springs,

The present invention relates to a brake pad spring and a method of manufacturing the brake pad spring. More particularly, the present invention relates to a brake pad spring and a method of manufacturing the brake pad spring. And a method of manufacturing the same.

Generally, a brake is a device installed on each wheel for braking a vehicle to generate a braking force and to decelerate the vehicle while it is running, or to stop and stop the vehicle. Commonly applied brakes include drum brakes and disc brakes.

Among them, disc brakes are brakes that use a braking device that inserts a pair of brake pads into the disc to create a frictional force that slows the rotation of the shaft, such as the vehicle axis, and is used to reduce or maintain the rotational speed.

At this time, the caliper of the disc brake is a device that receives the hydraulic pressure generated in the master cylinder to be hydraulically converted and brakes by using the frictional force generated between the pad and the disc. At this time, a pad spring for guiding the pad to slide is provided in the caliper.

However, in the conventional pad spring, for example, the vibration applied to the pad is transmitted to the caliper, thereby generating noise and friction. Also, since the surface material of the pad spring is weakly scratched or peeled or broken, the maintenance cost is increased.

Korean Patent Publication No. 10-2015-0017573 Korean Registered Utility Model No. 20-0347965

Accordingly, it is an object of the present invention to provide a brake pad spring having at least lubricating properties by forming a solid lubricating coating layer on the pad spring and a method of manufacturing the brake pad spring.

More particularly, the present invention relates to a brake pad spring for lubricating a solid lubricating coating layer by forming a solid lubricating coating layer or an elastic coating layer on one surface or both surfaces contacting the pad, and a brake pad spring for attenuating vibration and noise by an elastic coating layer, The purpose of the method is to provide.

Another object of the present invention is to provide a method of manufacturing a pad spring capable of reducing energy consumption and cost ratio in a process by lowering the temperature of a drying and curing step in forming a coating layer in a pad spring manufacturing process, have.

The present invention relates to a brake pad spring which is positioned between a pad provided on a brake braking device and a caliper to assist sliding of the pad when the brake is operated and to prevent rubbing of the caliper surface, At least a pair of engagement portions formed on both sides of the tight contact portion and provided between the pad and the caliper; At least one pair of guide portions formed in the coupling portion and guiding the pads; A support portion formed on the guide portion and supporting the pad; And a coating layer formed on at least one surface selected from the contact portion, the engagement portion, the guide portion, and the support portion, wherein the coating layer is at least one selected from a solid lubricant coating layer and an elastic coating layer.

The coating layer includes a solid lubricating coating layer and an elastic coating layer, the solid lubricating coating layer being formed on a surface in contact with the pad, and the elastic coating layer being formed on a surface in contact with the caliper.

At this time, the coating layer includes an elastic coating layer, and the elastic coating layer may be formed on both the surface in contact with the pad and the surface in contact with the caliper.

In addition, the coating layer includes a solid lubricating coating layer, wherein the solid lubricating coating layer may be formed on both the surface contacting the pad and the surface contacting the caliper.

In particular, the elastic coating layer may comprise a polymer rubber of chloroprene.

The polymer rubber of the chloroprene may be contained in an amount of 5 to 60% by weight.

Further, in the present invention, the solid lubricating coating layer may further comprise polytetrafluoroethylene. In addition, the solid lubricating coating layer can provide a brake pad spring having a coating hardness of 9H or more.

In addition, the present invention provides a method of manufacturing a brake pad spring that is positioned between a pad provided on a brake braking device and a caliper to assist sliding of a pad when a brake is operated and prevent a caliper surface from being rubbed,

A first step of preparing a base material of a brake pad spring; And a second step of forming a coating layer on one side or both sides of the base material, wherein the second step includes a step of forming a solid lubricating coating layer and a step of forming an elastic coating layer, ≪ / RTI >

More specifically, the step of forming the solid lubricating coating layer includes a coating step (a2) of coating the base material with a solid lubricating coating liquid, and a drying step (b2) of drying the solid lubricating coating liquid, Wherein the lubricating coating liquid contains polytetrafluoroethylene and the drying is performed at 190 to 250 ° C in the drying step (b2).

In the present invention, the step of forming the elastic coating layer may include a coating step (a1) of coating an elastic coating liquid on the base material and a drying step (b1) of drying the elastic coating liquid, wherein the elastic coating liquid is a polymer rubber of chloroprene Wherein the drying step (b1) comprises drying at 130 to 170 ° C.

According to the present invention, a lubricating coating layer formed on one side or both sides of the pad spring is included, and at least lubricity is provided. In addition, it has excellent solid lubricity and durability, so that the surface of the pad spring can be protected from the risk of various scratches.

In addition, according to the present invention, the elastic coating layer is formed on the other surface or both surfaces of the pad spring in contact with the caliper, thereby suppressing transmission of vibration applied to the pad to the caliper, thereby reducing vibration, There is an effect to be maintained.

Therefore, the life of the pad spring can be prolonged by forming at least one of the solid lubricating coating layer and the elastic coating layer on one surface or both surfaces of the pad spring.

In addition, the present invention can reduce the energy consumption and the cost ratio in the process by lowering the temperature in the drying step during the coating layer manufacturing process of the pad spring. In addition, the curing temperature of the surface coating of the pad spring is reduced to improve the productivity.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a caliper interior structure including a brake pad spring in accordance with the present invention;
2 is a perspective view showing a brake pad spring and a solid lubricating coating layer according to an embodiment of the present invention;
3 is a sectional structural view of a pad spring coating layer according to an embodiment of the present invention.
4 is a graph showing friction coefficients according to the load of Example 5 and Comparative Example 1 of the present invention.
5 is a photograph of a coating thickness measurement result of Example 5 of the present invention.
Figs. 6 and 7 are graphs showing the test results of the frictional coefficient according to the number of times of friction in the fourth and fifth embodiments, respectively.
8A and 8B are photographs showing the results of the tests of Comparative Example 1 and Example 5 after five times of coating hardness test.

The terms "forming on top", "forming on top", "forming on bottom", "on top", "mounting on top" and " Does not mean that the constituent elements are directly laminated (installed), but includes the meaning that other constituent elements are formed (installed) between the constituent elements.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

The present invention provides a brake pad spring (150) and a method of manufacturing the same. Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings illustrate exemplary embodiments of the invention and are provided to aid in the understanding of the invention only. In the accompanying drawings, the thickness may be enlarged to clearly show each layer and the area, and the scope of the present invention is not limited by the thickness, size, and / or ratio shown in the drawings.

1 is an exploded perspective view of a brake braking device including a brake pad spring 150 according to the present invention. The brake braking device includes a caliper 1, a body 3, a pad 5, a piston 7, a shim 9, and a pad spring ) 150 and the like.

Specifically, the brake braking apparatus includes a body 3 fixed to the vehicle body, a caliper 1 (hereinafter, referred to as a " brake ") having a guide groove formed therein, ). A piston 7 which is engaged with a hole formed at one side of the body 3 and generates hydraulic pressure in accordance with the pressure of the brake pedal, a protruding step is formed to be inserted into the guide groove of the caliper 1, A pair of pads 5 having a pair of friction pads contacting the pad 5 and a shim 9 which is mounted on the back surface of the pad 5 and minimizes noise generated when the pad 5 and the disk are in friction with each other, And a pair of pad springs 150 positioned inside the caliper 1 and serving as mounts for fixing the pad 5.

The brake pad spring 150 is positioned between the pad 5 provided on the brake braking device and the caliper 1 to assist sliding of the pad 5 when the brake is operated and to prevent the surface of the caliper 1 from being rubbed . Accordingly, the brake pad spring 150 requires a solid lubricating coating for soundproofing and abrasion-resistant functions. In particular, the brake pad spring 150 should have low friction characteristics of the surface during operation. The pad spring 150 serves to prevent the vibration applied to the caliper 1 from being transmitted to the caliper 1 while guiding the sliding operation of the pad 5 between the pad 5 and the caliper 1. [

2 is a perspective view showing a brake pad spring 150 according to the present invention.

Referring to FIG. 2, a brake pad spring 150 according to the present invention includes a base material 100 and a coating layer 210 (220) formed on the surface of the base material 100. At this time, the coating layers 210 and 220 include at least one selected from a solid lubricant coating layer 210 and an elastic coating layer 220.

According to one embodiment, the solid lubricous coating layer 210 may be formed on one side of the base material 100 in contact with the pad 5. The elastic coating layer 220 may be formed on the other surface of the base material 100 in contact with the caliper 1.

More specifically, the base material 100 includes a tight contact portion 155, a coupling portion 162, a guide portion 170, and a support portion 183. The solid lubricant coating layer 210 is formed on one surface of the adhesion portion 155, the coupling portion 162, the guide portion 170 and the support portion 183 which is in contact with the pad 5, Is fixed to the vehicle body and slidably received in the disk. Further, the lubricity of the pad spring 150 is improved to improve abrasion resistance, frictional resistance and durability.

The elastic coating layer 220 is formed on the other surface of the contact portion 155, the engaging portion 162, the guide portion 170 and the support portion 183 which is in contact with the caliper 1, And serves to suppress transmission of vibration to the caliper 1 side.

The tight contact portions 155 are positioned between the pad 5 and the caliper 1 and are in close contact with the inner and / or outer surfaces of the pad 5 and the caliper 1. The engaging portions 162 have at least one pair and are formed symmetrically with each other on both sides of the fastening portion 155. The engaging portion 162 is engaged between the pad 5 and the caliper 1. The guide portion 170 has at least one pair and is formed in the engaging portion 162 and serves to guide the pad 5. [ The support portion 183 is formed on the guide portion 170 and serves to support the pad 5.

3 is a cross-sectional structural view of the pad lubricant coating layer 210 and the elastic coating layer 220 according to the embodiment of the present invention.

The solid lubricant coating layer 210 may be formed by coating a composition including a binder 35, a solid lubricant 55, other additives 15 and a solvent. More specifically, the solid lubricating coating layer 210 comprises 5 to 60% by weight of the binder 35, 5 to 20% by weight of the solid lubricant 55, 0.5 to 15% by weight of the additive 15 and 15 to 88% And the like.

The binder 35 acts as a binder for the solid lubricant 55. The binder 35 may be a polyurethane (PU), a polyamide imide (PAI), an epoxy, or the like.

Further, the solid lubricant 55 may be added for the purpose of lubrication of the surface of the metal base material 100. In addition, spherical particles having good dispersibility and not significantly decreasing lubricity can be used. For example, polytetrafluoroethylene (PTFE), graphite, molybdenum disulfide (MoS ₂ ), graphene, boron nitride (BN), WS ₂ , PbS, Sb ₂ O ₃ , PbO, polyetherether ketone (PEEK), carbon black, and the like.

Particularly, polytetrafluoroethylene (hereinafter referred to as PTFE) is a component that can be further added to form a coating having a low coefficient of friction. By virtue of the strong chemical bonding between fluorine and carbon, they form highly stable compounds, resulting in almost complete inertness and heat resistance, non-tackiness, and low coefficient of friction. It also has the function of improving the lubricity, releasability and abrasion resistance of the coating.

In addition, the additive in the present invention is not particularly limited as long as it is an additive commonly used in the art, and it is preferable to add an antifoaming agent for removing air bubbles generated during the coating operation, a leveling agent for influencing the external appearance of the coating film and the surface scratch resistance, and / Adhesion promoting agent may be used.

On the other hand, in the case of the brake pad spring 150 having a shock and a high load, the coating including the binder 35 and the solid lubricant 55 may be abraded by scratches and the lubricating life may be shortened. In order to overcome such a problem, nanoceramic particles can be further added with other additives (15).

When the curing temperature is high, the nanoceramic particles prevent the problem that the inherent physical properties of the base material 100 are changed or distorted, and provide hardness and abrasion resistance of the material. Nano-ceramic particle in the present invention include TiO _2, alumina (Alumina) particles (e. _{G., Α-Al 2 O 3,} β-Al 2 O 3, Al 2 O 3 _and H ₂ O, etc.), ZrO _2, carbon A nanotube (CNT) or the like can be used. In addition, the nano-ceramic particles may be contained in the solid lubricant coating layer 210 in an amount of 5% by weight or less, specifically 0.1 to 5% by weight.

Finally, the solvent is N-methyl pyrrolidone, C ₅ H ₃ NO, NMP, methyl ethyl ketone, CH ₃ COC ₂ H ₅ , MEK), dimethylacetamide Acetamide, C ₄ H ₉ NO, DMAC), Ethyl Acetate (CH ₃ COOC ₂ H ₅ , EA).

In addition, the kind of the binder 35, the solid lubricant 55 and the other additives 15 mentioned above are not limited thereto. The content is not particularly limited.

According to a preferred embodiment, the solid lubricating coating layer 210 may comprise 10 to 35 parts by weight of the binder, 10 to 20 parts by weight of the solid lubricant and 0.5 to 5 parts by weight of the additive. That is, the solid lubricant coating layer 210 may have a composition based on the dry weight of binder: solid lubricant: additive = 10 to 35:10 to 20: 0.5 to 5 parts by weight. More specifically, the solid lubricating coating layer 210 may be formed by coating a composition containing 10 to 35% by weight of a binder, 10 to 20% by weight of a solid lubricant, 0.5 to 5% by weight of an additive, and a residual solvent. At this time, the residual solvent may be used within a range of, for example, 20 to 70% by weight or 30 to 50% by weight. When the solid lubricant coating layer 210 is included in the above-described components and contents, the best effects can be obtained. These effects can be supported by the following Tables 1 and 2.

Meanwhile, the elastic coating layer 220 may be selected from among rubber. More specifically, the present invention relates to a rubber composition comprising an NBR, NBR, Ethylene Proplene Diene Monomer rubber (hereinafter referred to as EPDM rubber), Natural Rubber (hereinafter referred to as NR) (Hereinafter referred to as SBR), chlorosulfonated polyethylene (hereinafter referred to as CSM), sponge roll (foam rubber), silicone (silicone rubber), butyl rubber, polyurethane Polyurethane and / or 2-chloroprene rubber (hereinafter referred to as CR rubber) may be used.

In particular, the CR rubber is a rubber composed of a polymer of 2-chloroprene rubber, which is also called a neoprene rubber. Unlike ordinary rubber, it has excellent weather resistance, chemical resistance and flame retardancy. In addition, it has low gas permeability, high adhesive strength and good mechanical properties. And can be usefully used in the present invention due to its strong heat resistance and low thermal expansion. In addition, the CR rubber may be contained in the elastic coating layer 220 in an amount of 5 to 60% by weight.

The elastic coating layer 220 may be formed by coating an elastic coating liquid containing the rubber streams and the solvent on the base material 100.

2 and 3, the pad spring 150 may be formed on one surface of the pad spring 150, which contacts the pad 5, on the other surface contacting the caliper 1 and the solid lubricant coating layer 210 An elastic coating layer 220 is formed. Therefore, the pad spring 150 having the solid lubricative coating layer 210 and the elastic coating layer 220 functions to smoothly guide the sliding operation of the pad 5 and the function to smoothly guide the sliding action of the pad 5 to the caliper 1 And at the same time, the friction reducing function and the buffering function are continuously maintained for a long time.

More specifically, when the pads 5 formed of the metal base material come into contact with the pad springs 150 during operation of the pad 5 for pressing and braking in the rotation of the disk, scratches due to friction may be generated. At this time, the solid lubricant coating layer 210 formed on the pad spring 150 can improve smooth sliding motion of the pad 5 and reduce the friction generated upon contact. Further, it has the effect of enhancing the adhesion between the base material 100 and the solid lubricative coating layer 210 while having lubricating properties, and being resistant to scratches, thereby increasing wear resistance and durability.

The elastic coating layer 220 absorbs vibrations generated in the direction perpendicular to the sliding direction of the pad 5 to the vehicle body through the caliper 1 and reduces the elastic deformation and restoration ability over time And has an effect of improving the elasticity force for continuously performing the damping function.

Therefore, the pad spring 150, in which the solid lubricating coating layer 210 and / or the elastic coating layer 220 are formed, can reduce the residual life due to wear, noise, and vibrations generated during long term use of the brake braking device, Lt; / RTI >

As shown in FIG. 2, the solid lubricant coating layer 210 and / or the elastic coating layer 220 may be uniformly coated over the entire area of both surfaces of the pad spring 150, It may be coated locally only for some areas.

<Manufacturing Method>

The method of manufacturing the pad spring 150 according to the present invention may include a first step of preparing the base material 100 of the brake pad spring and a second step of forming a coating layer on one side or both sides of the base material 100. Wherein the second step includes forming at least one of the solid lubricant coating layer 210 and the elastic coating layer 220. [

In the first step, the metal plate is pressed, molded or machined in the form of the pad spring 150, and then alkali-washed to prepare the base material 100.

In the second step, a coating layer is formed on one side or both sides of the base material 100 of the pad spring 150.

The step of forming the solid lubricating coating layer in the second step may include a coating step a2 for coating the base material 100 with a solid lubricating coating liquid and a drying step b2 for drying the solid lubricating coating liquid.

At this time, the coating step (a2) is prepared by mixing a binder, a solid lubricant, other additives and a solvent to prepare a solid lubricant coating solution. Next, the base material 100 of the brake pad spring 150 may be coated with a spray and a roll having a solid lubricant coating liquid on at least one side or both sides thereof. The drying step (b) can then be cured by drying within 400 ° C. After the drying step, the solid lubricating coating layer 210 may further include a secondary coating step (a2) and a drying step (b2) at least once at a predetermined thickness. In addition, the present invention is not limited thereto and may be coated and dried by various methods depending on the case, and the number of times is not limited to second order.

In particular, when the solid lubricant coating liquid contains polytetrafluoroethylene as a solid lubricant, it can be dried at 190 to 250 ° C in the drying step (b2). If the thermal drying (curing) temperature is less than 190 ° C, the thermosetting is not sufficiently carried out and the mechanical strength is lowered. When the temperature is more than 250 ° C, the crystalline state gradually changes and the relatively weak properties such as viscosity and abrasion are increased.

More specifically, the higher the drying temperature is, the more energy is consumed in the process, which may affect the energy consumption and production cost of the product.

In addition, the step of forming the elastic coating layer in the second step may include a coating step (a1) of coating an elastic coating liquid on the base material (100) and a drying step (b1) of drying the elastic coating liquid.

At this time, in the coating step (a1), one of the rubber streams is selected to prepare an elastic coating solution. Next, the base material 100 of the brake pad spring 150 may be coated with a spray and a roll having an elastic coating liquid on at least one side or both sides thereof. Subsequently, the drying step (b1) can be cured by drying within 400 占 폚. After the drying step, the elastic coating layer 220 may further include a secondary coating step (a1) and a drying step (b1) at least once at a predetermined thickness. In addition, the present invention is not limited thereto and may be coated and dried by various methods depending on the case, and the number of times is not limited to second order.

In particular, when the elastomeric coating liquid contains the polymer rubber of chloroprene, the drying step (b1) can be dried at 130 to 170 ° C. If the thermal drying (curing) temperature is less than 130 ° C, the thermosetting is not sufficiently performed and the mechanical strength is lowered. If the temperature is higher than 170 ° C, the energy consumption in the process and the production cost of the product may increase.

In addition, the method of manufacturing the pad spring 150 according to the present invention may further include or omit the coating and drying steps in the step as the case may be. The embodiments of each step are as follows.

Hereinafter, embodiments of the present invention will be exemplified. The following examples are provided to illustrate the present invention in order to facilitate understanding of the present invention, and thus the technical scope of the present invention is not limited thereto. It is also not meant to be a prior art, but is provided for comparison with embodiments only.

[Example 1]

The solid lubricant coating layer 210 is a solid lubricant coating layer composed of polyamide imide (PAI), polytetrafluoroethylene (PTFE), other additives 15 and a solvent in a weight ratio of 40: 8: 2: 50 A lubricating coating solution was prepared. The additive 15 may include a curing agent, a dispersant, a defoaming agent, a leveling agent, and the like. Next, the solid lubricating coating liquid is coated on one side or both sides of the metal base material 100 of the pad spring 150 to form the solid lubricating coating layer 210. Finally, a pad spring 150 specimen having the solid lubricant coating layer 210 formed thereon was manufactured according to the above-described manufacturing method.

[Example 2]

The solid lubricant coating layer 210 is formed of a polyamide imide (PAI), polytetrafluoroethylene (PTFE), carbon black, other additives 15 and a solvent in a ratio of 37: 8: 3: 2: 50 weight ratio. Next, a pad spring 150 specimen having a solid lubricating coating layer 210 formed thereon was prepared in the same manner as in Example 1.

[Example 3]

The solid lubricant coating layer 210 may be formed by coating polyamide imide (PAI), polytetrafluoroethylene (PTFE), carbon black, other additives 15 and a solvent in a ratio of 35: 6: 3: 1.5: 54.5 parts by weight of a solid lubricating coating liquid. Herein, as a further additive, a nano powder of Al ₂ O ₃ was added in a trace amount of 1 wt%. Next, a specimen was prepared in the same manner as in Example 1.

[Example 4]

The solid lubricant coating layer 210 may be formed of a material such as polyamide imide (PAI), epoxy, polytetrafluoroethylene (PTFE), molybdenum disulfide (MoS ₂ ), graphite, And a solvent in a weight ratio of 30: 10: 8: 7: 2: 4.5: 38.5 are prepared. Nano powders of 1 wt% of TiO ₂ and 3 wt% of Al ₂ O ₃ were added to the other additives. Next, a pad spring 150 specimen having a solid lubricating coating layer 210 formed thereon was prepared in the same manner as in Example 1.

[Example 5]

The solid lubricating coating layer 210 is prepared by preparing a solid lubricating coating liquid comprising polyamide imide (PAI), PTFE, carbon black, other additives 15 and a solvent in a weight ratio of 30: 16: 3: 2: 49. Then, a specimen was prepared in the same manner as in Example 1.

[Comparative Example 1]

The solid lubricating coating layer 210 is formed by mixing polyamide imide (PAI), molybdenum disulfide (MoS ₂ ), graphite, other additives 15 and a solvent in a weight ratio of 5: 10: 5: 10: Prepare a solid lubricating coating solution. Next, a specimen was prepared in the same manner as in Example 1.

[Example 6]

An elastic coating liquid containing 60% by weight of CR rubber, which is a polymer of 2-chloroprene rubber, was prepared as the elastic coating layer 220. Solvents and other additives were used as the balance. Other additives may include defoaming agents, labeling agents, dispersing agents, and the like. Next, the elastic coating liquid is coated on one side or both sides of the metal base material 100 of the pad spring 150 to form an elastic coating layer 220. Finally, a pad spring 150 specimen having an elastic coating layer 220 formed according to the above manufacturing method was manufactured.

[Example 7]

The elastic coating layer 220 contained an elastic coating liquid containing 35% by weight of CR rubber, which is a 2-chloroprene rubber, and the remaining amount included solvents and other additives. Next, a pad spring 150 specimen having the elastic coating layer 220 formed thereon was manufactured in the same manner as in Example 6. [

[Example 8]

The elastic coating layer 220 contained an elastic coating liquid containing 10% by weight of CR rubber, and the remaining amount included solvent and other additives. Next, a pad spring 150 specimen having the elastic coating layer 220 formed thereon was manufactured in the same manner as in Example 6. [

[Comparative Example 2]

The mixture and remaining amount of 50% by weight of the heat-resistant reinforced rubber and 40% by weight of the polyurethane in the elastic coating layer 220 included other additives and solvents. At this time, SBR (Styrene Butadiene Rubber) was used as the heat resistant reinforced rubber. Next, a pad spring 150 specimen having the elastic coating layer 220 formed thereon was manufactured in the same manner as in Example 6. [

Table 1 below shows the content and content of the solid lubricating coating layer 210 of the specimen of the pad spring 150 according to Examples 1 to 5 and Comparative Example 1. In Table 1, the content (% by weight) of each component is based on the total weight of the coating liquid.

 <Material and content of brake pad spring solid lubricating coating layer according to each specimen> Coating specimen Content and content (%) bookbinder Solid lubricant Other additives solvent PAI Epoxy PTFE Carbon
black MoS ₂ Graphite Nano
particle Other Example 1 40 - 8 - - - - 2 50 Example 2 37 - 8 3 - - - 2 50 Example 3 35 - 6 3 - - One 0.5 54.5 Example 4 30 10 8 - 7 2 4 0.5 38.5 Example 5 30 - 16 3 - - - 2 49 Comparative Example 1 5 - - - 10 5 - 10 70

The properties of each specimen in [Table 1] and [Table 2] were evaluated by the following test methods and conditions.

[Drying temperature]

And maintained at a temperature of 1.25 ° C / min for 40 minutes, cooled in an oven, dried and cured to prepare a pad spring 150 specimen. At this time, the cured dry temperature results of the specimen having the solid lubricous coating layer 210 were recorded.

[Coating (pencil) hardness]

The specimens with the solid lubricous coating layer 210 were fixed on a flat and hard surface and evaluated with a specified pencil 9H for a total of 5 times with a load of 1,000 gf and 20 mm at a speed of 5 mm / s. At this time, "NG" is indicated when the base material is exposed, and "OK" is displayed when the base material is not exposed.

[Coating Thickness]

The cut surface perpendicular to the coated surface was mounted and polished to make a mirror surface and measured using a video microscope measuring apparatus. In addition, images were obtained at three cut-off and two-sided points in the thickness measurement, and the minimum thickness of the specimen having the solid lubricating coating layer 210 at a magnification of 1700 was measured.

[Coefficient of Friction and Wear]

According to the pin-on-disk method, a friction / wear tester was used. The test conditions were an average friction coefficient and a wear amount of the specimen having a coating thickness of 15 to 25 μm.

The above results are summarized in Table 2 below.

&Lt; Evaluation value of characteristics of solid lubricant coating layer specimen & Coating specimen Drying temperature
(° C) Coating Hardness Coating thickness
(탆) Coefficient of friction Wear amount (mg) Example 1 239 OK (3/5) 23.3 0.27 6.0 Example 2 231 OK (3/5) 22.7 0.23 5.1 Example 3 225 OK (4/5) 23.1 0.22 2.1 Example 4 215 OK (4/5) 21.4 0.13 1.9 Example 5 195 OK (5/5) 17.3 0.06 1.7 Comparative Example 1 360 NG 25.8 0.64 8.8

1) Characterization of specimen according to drying temperature

In the case of Comparative Example 1, the curing drying temperature was 350 ° C or higher, and in the tests of the solid lubricating coating layer 210, Examples 1 to 5 were cured at a temperature within 250 ° C. Particularly, in the case of Example 5, the test results showed that the cured product was dried at a relatively low drying temperature of 195 ° C as compared with the other Examples. Accordingly, it is possible to reduce the energy consumption in the process and the cost ratio by reducing the drying temperature, and to improve the productivity of the pad spring 150.

2) Characterization of specimen according to coating hardness

8A and 8B are photographs showing the results of the tests of Comparative Example 1 and Example 5 after five times of coating hardness. The hardness of the coating was measured by using a pencil hardness tester and a qualitative value based on the hardness of the pencil used was used as a standard. The high hardness standard is a hardness of the pencil hardness, and is a unit that indicates excellent hardness in the order of 9H> 6H> 5H> HB> B> 2B> 4B. In particular, when the coating hardness is 9H or more, the coating layer is very hard, which means that it is resistant to damage such as external scratches. According to the test results in [Table 2], all the examples were marked as " OK " except for Comparative Example 1. Particularly, in Example 5, since the base material was not exposed five times in the fifth test, it was found that the base material was excellent in wear resistance (durability) when compared with other examples.

3) Characterization of specimen according to coating thickness

5 is a photograph of the result of coating thickness measurement of Example 5. Fig. The coating thickness of the solid lubricant coating layer 210 formed on the base material 100 was 17.3 탆. In particular, Example 5 exhibited a thickness of less than 20 占 퐉 in spite of the high coating hardness (9H) as compared with the other Examples. Therefore, it was found that Example 5 is the thinnest even with a high coating hardness, and is most suitable and excellent for coating a precise mold product.

4) Characteristic evaluation of specimen according to friction coefficient

Fig. 4 is a graph showing friction coefficients according to the load of Example 5 and Comparative Example 1. Fig.

As can be seen from FIG. 4, as the load increases with time, the friction coefficient of Example 5 is lower than that of Comparative Example 1. In this case, the friction coefficient is defined as a relative ratio of the friction force divided by the load (vertical contact force), and is greatly influenced by the state of the object surface in contact with the material of the two objects. Therefore, the lower the friction coefficient is, the more the solid lubricant coating layer 210 can improve the problem of sticking to the pad spring 150 base material 100.

Figs. 6 and 7 are graphs showing the results of testing the friction coefficient according to the number of rubbing of the fourth and fifth embodiments, respectively. More specifically, FIG. 6 is a graph of Example 4, and an average friction coefficient according to the number of friction is 0.13. And FIG. 7 is a graph in which the fifth example is tested. The average coefficient of friction according to the number of friction is 0.06. Therefore, it can be seen that the fourth and fifth embodiments have the lowest frictional coefficient among other embodiments and are therefore superior to other specimens.

5) Characteristic evaluation according to wear amount

The lower the amount of wear (mg), the less wear of the solid lubricant coating layer 210 due to friction. As a result of the test for each specimen according to [Table 2], the abrasion amount of Examples 1 to 5 was in the range of 6.5 mg or less. The highest wear amount was Comparative Example 1 and the lowest wear amount was Examples 4 and 5. Therefore, it was found that Examples 4 and 5 had the best abrasion resistance (durability) due to less wear even when exposed to a friction environment.

Particularly, Examples 1 to 5 further included polytetrafluoroethylene (PTFE) among the solid lubricants. Therefore, the evaluation of the characteristics of each specimen was better than that of Comparative Example 1. [

More specifically, in Examples 3 to 4 and Example 2, in Examples 3 to 4 in which nanoparticles were added to the solid lubricous coating layer 210 under the same conditions, the coefficient of friction and wear amount were slightly higher . Therefore, it was evaluated as relatively high in comparison with Examples 1 and 2.

On the other hand, polytetrafluoroethylene (PTFE) was added to the solid lubricating coating layer 210 of Example 5 by 8% more than that of Example 4. Also, a sample was prepared from dimethyl acetamide (C ₄ H ₉ NO, DMAC) as a solvent. Therefore, it can be evaluated that the friction coefficient and the wear amount are remarkably reduced as compared with other examples, and therefore, the wear resistance (durability) and the adhesion are very excellent.

In addition, under the same conditions, the drying temperature was less than 200 ° C lower than those of Examples 1 to 4. Even though the coating hardness was the highest at 9H, it was found that it is the best specimen because the coating thickness is thinly coated within 20μm. Therefore, the fifth embodiment can be applied to a mold product requiring precision other than the pad spring 150 because the coating thickness is thin even with high abrasion resistance (durability) and hardness.

Table 3 below shows the content, the content and the drying temperature of the specimen of the elastic coating layer of the pad spring.

&Lt; Elastic coating layer (220) Specimen-containing material, content and drying temperature > Coating specimen Content and content (%) Drying temperature
(° C) CR rubber Heat-resistant rubber PU Example 6 60 168 Example 7 35 150 Example 8 10 131 Comparative Example 2 50 40 360

In Table 3, in Comparative Example 2, the elastic coating layer 220 is obtained by synthesizing heat-resistant reinforced rubber and polyurethane. As shown in Table 3, Examples 6 to 8, in which the curing temperature was 350 ° C or higher in the case of Comparative Example 2 and 5 to 60% by weight of the CR rubber were contained in the carbon coating layer 220, Lt; 0 &gt; C to 170 &lt; 0 &gt; C. In particular, in the case of Example 8 containing 10% by weight of CR rubber, it was found from the test results that the curing was carried out at a drying temperature of 131 캜 which is relatively low as compared with the other Examples.

Thus, Examples 6 to 8 not only reduce the energy consumption and the cost ratio in the conventional process, but also improve the productivity.

It is to be understood that the invention is not limited to the disclosed embodiments, but is capable of many modifications and alterations, all of which are within the scope of the appended claims. It is self-evident.

1: Caliper 3: Body
5: Pad 7: Piston
9: Shim 15: Other additives
35: Binder 55: Solid lubricant
100: Base material 150: Pad spring
155: tight contact portion 162:
170: guide portion 183:
210: solid lubricating coating layer 220: elastic coating layer

Claims (11)

A brake pad spring which is positioned between a pad provided on a brake braking device and a caliper to help sliding of the pad when the brake is operated and to prevent the surface of the caliper from being rubbed,
A tight contact portion between the pad and the caliper;
At least a pair of engagement portions formed on both sides of the tight contact portion and provided between the pad and the caliper;
At least one pair of guide portions formed in the coupling portion and guiding the pads;
A support portion formed on the guide portion and supporting the pad; And
And a coating layer formed on at least one surface selected from the tight contact portion, the engaging portion, the guide portion and the support portion,
Wherein the coating layer comprises:
An elastic coating layer formed on a surface in contact with the caliper; And
And a solid lubricating coating layer formed on a surface in contact with the pad,
Wherein the elastic coating layer comprises a polymer rubber of chloroprene and is formed by drying at a temperature of 130 to 170 캜 after coating an elastic coating liquid containing 5 to 60% by weight of the polymer rubber of chloroprene,
The solid lubricating coating layer is formed by coating a solid lubricating coating solution containing 10 to 35% by weight of a binder, 10 to 20% by weight of a solid lubricant, 0.5 to 5% by weight of an additive,
Wherein the additive comprises at least one nanoceramic particle selected from Al ₂ O ₃ and TiO ₂ ,
Wherein the solid lubricating coating layer has a pencil hardness of 9H or more. delete delete delete delete delete The method according to claim 1,
Wherein the binder comprises a polyamideimide (PAI) and an epoxy,
The solid lubricant is polytetrafluoroethylene (PTFE), the brake pad spring containing molybdenum disulfide (MoS ₂₎ and graphite (Graphite). delete A method of manufacturing a brake pad spring according to claim 1,
A first step of preparing a base material of a brake pad spring; And
And a second step of forming a coating layer on the base material,
In the second step,
Forming an elastic coating layer on one side of the base material;
And forming a solid lubricating coating layer on the other side of the base material,
The step of forming the elastic coating layer may include a coating step (a1) of coating an elastic coating liquid on the base material with an elastic coating liquid containing 5 to 60% by weight of a polymer rubber of chloroprene,
(B1) drying the elastic coating solution at a temperature of 130 to 170 DEG C,
The step of forming the solid lubricant coating layer comprises coating a solid lubricant coating solution containing 10 to 35% by weight of a binder, 10 to 20% by weight of a solid lubricant, 0.5 to 5% by weight of an additive, (a2)
(B2) drying the solid lubricant coating solution at a temperature of 190 to 250 DEG C,
Wherein the additive comprises at least one nanoceramic particle selected from Al ₂ O ₃ and TiO ₂ . 10. The method of claim 9,
Wherein the binder comprises a polyamideimide (PAI) and an epoxy,
The solid lubricant is polytetrafluoroethylene (PTFE), method for manufacturing a brake pad spring containing molybdenum disulfide (MoS ₂₎ and graphite (Graphite). delete

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