• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
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  • 优先权
    • 专利摘要:
    FRICTION MATERIAL FOR BRAKES A metallic fiber, copper and an asbestos-free and titanate-free friction material is provided. The friction material includes a binder, such as a phenolic resin, forming 16-24% by volume; a fiber, such as aramid fiber, forming 4-12% by volume; a lubricant, such as a mixture of antimony trisulfide and another metal sulfide, forming 2-5% by volume; and at least one abrasive, such as a mixture of mineral fiber, magnesium oxide and mica, forming 10-22% by volume. The friction material further comprises the rubber powder in an amount of at least 4% by volume. The brake pad can be formed by a cost-effective process consisting essentially of mixing the ingredients, pressing and curing the friction material to a backing plate and after baking the brake pad.
    公开号:BR112014003684B1
    申请号:R112014003684-5
    申请日:2012-08-14
    公开日:2020-12-29
    发明作者:Vijay Subramanian
    申请人:Tenneco Inc；
    IPC主号:
    专利说明:

    CROSS REFERENCE FOR RELATED PATENT APPLICATION
    [0001] This patent application is a partial extension and claims the benefit of U.S. patent application serial number 12 / 245,222, filed on October 3, 2008, which is incorporated into this application, by reference, in its entirety. FIELD OF THE INVENTION
    [0002] The present invention relates to an asbestos-free friction material and especially a friction material for a brake pad to be used in vehicle or industrial machine brakes. BACKGROUND OF THE INVENTION
    [0003] Copper, in non-asbestos-based friction materials for brake pads, provides many useful performance and property characteristics, including excellent reinforcing strength, increased friction coefficient at high temperatures and excellent heat transfer properties. In addition, copper provides many other qualities that increase the longevity of the friction material and the components with which the friction material comes into contact, as well as reducing the brake dust. However, copper is expensive and, therefore, those skilled in the art seek materials with a better cost / benefit ratio for use in brake pads.
    [0004] Asbestos-free materials for brake pads commonly also include titanates, for example, the friction materials of U.S. Patent No. 6,656,240 to Chiba et al. Titanates can provide stability at high temperature comparable to materials of the type containing asbestos. Titanium materials, such as hexatitanate and octatitanate, are useful as they cover the rotor surface with a uniform and consistent transfer layer. However, like copper, titanates are also expensive and, therefore, those skilled in the art seek materials with a better cost / benefit ratio for use in brake pads.
    [0005] Steel fibers have been used in place of copper and titanates in friction materials not based on asbestos for brake pads. U.S. Patent No. 6,220,405 to Kesaven et al discloses examples of copper-free friction materials including steel fibers. However, steel fibers do not have many of the positive attributes of copper and are more frictionally aggressive, thereby increasing the amount of wear on the rotor against which the friction material comes into contact. Steel fibers also generate dust, which can quickly and permanently stain the surface finish of a vehicle's rims.
    [0006] Materials for asbestos-free copper brake pads, including high amounts of dust, have also been developed. U.S. Patent No. 6,617,375 to Kobayashi et al discloses examples of asbestos-free copper friction materials, including high amounts of cashew powder.
    [0007] However, processing such materials provides high rates of waste and requires other costly process steps. SUMMARY OF THE INVENTION
    [0008] One aspect of the present invention provides an asbestos-free friction material for a brake that is free of copper, metal fibers and titanates. The friction material comprises, in percentage (%) by volume of the friction material: a binder forming 15-24% by volume; a fiber forming 3-13% by volume and a lubricant forming 2-6% by volume. The lubricant includes at least one sulfide. The friction material further comprises at least one abrasive forming 9-22% by volume and a filler forming 46-65% by volume. The filler includes a rubber powder and the rubber powder forms at least 4% by volume of the friction material. Metallic fibers, titanates and copper, each form no more than 0.2% by volume of the friction material.
    [0009] Another aspect of the invention provides a brake pad comprising a backing plate and a friction pad attached to the backing plate, where the friction pad is made of the friction material.
    [0010] Yet another aspect of the invention provides a method of forming a brake pad, comprising the step of: mixing a binder, a lubricant, at least an abrasive and rubber powder to form a homogeneous mixture. The homogeneous mixture includes, based on the total volume of the mixture: a binder forming 15-24% by volume; a fiber forming 3-13% by volume; a lubricant forming 2-6% by volume; the lubricant including at least one sulfide; at least one abrasive forming 9-22% by volume; a filler forming 46-65% by volume, the filler including a rubber powder, wherein the rubber powder forms at least 4% by volume of the mixture; metallic fibers forming no more than 0.2% by volume; titanates forming no more than 0.2% by volume; and copper forming no more than 0.2% by volume. The method also includes pressing the homogeneous mixture under a pressure of 4-25 tons / piece at room temperature, to form a mixture friction pad; press the friction pad and a backing plate together, under a pressure of 5-50 tons / piece at a temperature of 129.4-146.1 ° C (265-295 ° F); and bake the pressed friction pad and the backing plate at a temperature of 165.6-187.8 ° C (330 - 370 ° F).
    [0011] While the prior art includes efforts to at least partially remove copper, or copper compounds, and certain degrees of titanates from friction pad compositions, it is known that this has not been successful without sacrificing characteristics of desirable performance, including stopping capacity, longevity, minimum rotor wear, minimum brake dust and minimally staining the vehicle's rims.
    [0012] However, the inventive friction material overcomes the deficiencies of the prior art, providing performance characteristics similar to those of friction materials containing copper and titanate for a fraction of the price, which was completely unexpected. Brake pads formed from the inventive friction material are produced at a cost 30-50% less than other friction materials, such as those containing copper and titanates.
    [0013] The inventive friction material also provides excellent process capabilities, including high efficiency and unexpectedly low residue rates, which contribute to lower production costs. Waste rates from the brake pad forming process using the inventive friction material are approximately 0.6% of primary materials, which is approximately 25% less than prior art waste rates, such as processes using friction including copper and titanates.
    [0014] The friction material of the present invention unexpectedly provides the same level of friction, pellet life, noise and other typical performance characteristics for materials not containing asbestos, copper or titanate. The brake pads formed from the inventive friction material pass the following application tests for vehicles: FMVSS 135 (14% stopping distance margin); vehicle life test (30,000 miles, minimum); and vehicle noise test (zero noise). BRIEF DESCRIPTION OF THE DRAWINGS
    [0015] The present invention will become more fully understood from the accompanying detailed descriptions, claims and design in which:
    [0016] FIG. 1 is a perspective view of an exemplary friction material incorporated in an exemplary brake pad. DETAILED DESCRIPTION OF A PREFERENTIAL MODE
    [0017] The described is an asbestos-free friction material for brake pads and other brake materials that include a binder; a fiber; a lubricant including at least one sulfide; at least one abrasive; a filler including rubber powder and which is substantially free of copper, metal fibers and titanates.
    [0018] The friction material 20 can be used on the brake pad 10 illustrated in fig. 1. The brake pad 10 shown in fig. 1 is just an exemplary brake pad and can be any size, shape or configuration. The friction material 20, when used on a brake pad 10, is typically bonded or otherwise attached to a backing plate 30.
    [0019] However, without asbestos, it means that the friction material includes asbestos in an amount not greater than 0.2% by volume, preferably not greater than 0.1% by volume, and more preferably 0% by volume, based on the total volume of friction material after processing.
    [0020] Substantially free of copper means that the friction material is substantially free of copper or copper alloys, such as brass and bronze, and includes each material containing copper in an amount not greater than 0.2% by volume , preferably not greater than 0.1% by volume, and more preferably 0% by volume, based on the total volume of the friction material, after processing.
    [0021] Substantially free of metallic fibers means that the friction material includes metallic fibers, such as steel or bronze fibers, in an amount not greater than 0.2% by volume, preferably not greater than 0.1% by volume, and more preferably 0% by volume, based on the total volume of the friction material, after processing. Metal fibers that are preferably not used in the friction material, can be formed from any metal or metal alloy and typically have a length of 0.5 mm to 10 mm.
    [0022] By being substantially free of titanates, it means being substantially free of compounds such as potassium titanate, potassium and magnesium titanate, lithium and potassium titanate, potassium and calcium titanate, and other hexa and octa-titanates and others titanates developed as alternatives to asbestos. The friction material includes titanates in an amount not greater than 0.2% by volume, preferably not greater than 0.1% by volume, and more preferably 0% by volume, based on the total volume of the friction material, after processing.
    [0023] The asbestos-free friction material of the invention includes at least one binder that forms approximately 16-24% by volume of the total friction material after processing, and preferably 18-22% by volume. The binder includes at least one resin, for example, a phenolic resin in a direct, unmodified or modified form. Examples of modified binders include silicon, acrylic, epoxy and nitrile. The binder serves as a matrix that holds other ingredients together in the friction material. The binder system can also comprise a mixture of two or more types of binders, at least one of which is a phenolic type binder, if desired, so that a specific application achieves a desired performance characteristic. In one embodiment, the resin is a mixture of a phenolic resin and a non-phenolic resin. In another embodiment, the binder is an unmodified phenolic resin and is present in an amount of 16-24% by volume, or 18-22% by volume or 21% by volume.
    [0024] The fiber of the friction material has a length of 0.5 mm to 10 mm and forms approximately 4-12% by volume of the total friction material, after processing, preferably 4-8% by volume. The fiber is preferably chosen from one or more aramid fibers, polyacrylonitrile (PAN) fibers and cellulose fibers. Aramid fibers preferably have an average length of 1.09 mm, with an approximate range of 0.92 mm to 1.26 mm. PAN fibers have a length range of approximately 5.0 to 7.5 mm. Cellulose fibers have a length of less than 1 mm. The fibers provide structural strength and integrity to the friction material. The fibers also help with the stability of pre-cured preforms during the production process. Various fibers and fiber lengths can therefore be used to control the performance and fabrication characteristics of the friction material. The fibers can be synthetic or natural in origin, and pure or recycled in form. In one embodiment, the fiber includes an aramid and is present in an amount of 4-12% by volume, or 4-8% by volume or 7% by volume.
    [0025] The lubricant includes at least one sulfide and forms approximately 2-5% by volume, preferably 2-4% by volume. In another embodiment, the lubricant forms no more than 5% by volume, or no more than 5% by volume. Lubricant is included in the friction material to reduce pad and disc wear during service. Candidate lubricating materials include metallic sulfides, non-metallic sulfides, organic lubricants, metallic lubricants or a combination thereof. Examples of metal sulfides include, but are not limited to, tin sulfide, antimony trisulfide, antimony trioxide, zinc sulfide and iron sulfide. An example of an organic lubricant is phthalocyanine and examples of metallic lubricants include zinc and tin powders. Metallic sulfides include metal sulfide complexes, such as those having tin sulfide as one of the main ingredients. In one embodiment, the lubricant includes a mixture of antimony trisulfide and at least one different metal sulfide from antimony trisulfide, each in an amount of 1-3% by volume or each in an amount of 2% by volume.
    [0026] The friction material still includes at least one abrasive, such as a hard abrasive or a soft abrasive. The abrasives form approximately 10-22% by volume of the friction material, after processing, preferably 12-18% by volume. More specifically, rigid abrasives typically form approximately 3-14%, while soft abrasives form approximately 3-14% by volume of the friction material. Examples of solid abrasives include certain mineral fibers, zirconia, alumina, magnesium oxide, zirconium silicate, silica, silicon dioxide, sand, silicon carbide, mullite, and iron oxide. Rigid abrasives tend to have higher values on the Mohs hardness scale. Other examples of abrasives include some grades of ceramic fibers, including complex mineral silicates such as calcium and magnesium silicate, zirconium, magnesium and calcium silicate, aluminum, magnesium and calcium silicate, and aluminum and magnesium silicate. Other known abrasives that are mild in nature include iron oxides of different chemicals, other metal oxides, and materials and minerals that have relatively lower values on the Mohs hardness scale. Rigid abrasives are generally used in low concentrations, while soft abrasives are typically used in higher concentrations to achieve the same level of friction desired.
    [0027] In one embodiment, abrasives include magnesium oxide in an amount of 3-8% by volume, or 4-7% by volume or 5% by volume, based on the total volume of the friction material. In another embodiment, abrasives include magnesium oxide in an amount not greater than 10% by volume, or not greater than 7% by volume, based on the total volume of the friction material.
    [0028] In another embodiment, abrasives include a mixture of magnesium oxide, mineral fiber, such as a biosoluble grade mineral fiber, and mica, each, present in an amount of 3-8% by volume or, each, not greater than 7% by volume or, each, 5% by volume, based on the total volume of friction material.
    [0029] The other ingredients included in the friction material form the balance of the composition and are generally classified as fillers and / or modifiers. The filler includes at least the rubber powder and typically includes a mixture of several components. The filler makes up approximately 46-64% of the friction material, after processing, and preferably 49 - 57% by volume. The filler generally provides volume to the formulation, reduces cost, provides noise reduction and helps with coating the rotor surface with a uniform transfer layer. Examples of suitable fillers include lime, calcium oxide, barite, including barium sulfate, graphite, petroleum coke, desulfurized coke, calcium silicate, rubbers, including various rubber powders, such as powdered nitrile rubber and recycled rubber and friction dust including brown, black, direct or other modified degrees of friction dust.
    [0030] In one embodiment, the rubber powder in the filler is present in an amount of 4 - 16% by volume, or 9% by volume, based on the total volume of the friction material. In another embodiment, in addition to the rubber powder in the amount of 4-16% by volume, the filler still includes the graphite in an amount of 3-9% by volume, or at least 5% by volume, or 6% by volume; petroleum coke in an amount of 3-9% by volume or 6% by volume; barite in an amount of 15-30% by volume or 21% by volume; friction dust in an amount of 4-16% by volume or 9% by volume; and hydrated mistletoe in an amount of 1 - 3% by volume or 2% by volume.
    [0031] Still, in one embodiment, the friction material is substantially iron-free and, therefore, includes iron in an amount not greater than 5% by volume, or not greater than 2%, or less than 1% or 0% by volume, based on the total volume of friction material, after processing.
    [0032] In another embodiment, the friction material is substantially free of wetting agents and, therefore, includes wetting agents in an amount not greater than 5% by volume, or not greater than 2% or 1% by volume, based on the total volume of friction material after processing. The wetting agent is also known as a surfactant, detergent, emulsifier, foaming agent or dispersant. The wetting agent is a chemical, or mixture of chemicals, that increases the spreading and penetrating properties of a liquid by reducing its surface tension. The wetting agent can reduce the surface tension of a liquid, the interfacial tension between two liquids or that between a liquid and a solid.
    [0033] The friction material is processed and formed by mixing, pressing and curing operations typically used in industry to make friction materials for brake pads. This involves dry mixing the ingredients in a standard drum mixer, with the optional use of plows and cutters to mix the ingredients in a homogeneous mixture. The total mixing time is approximately 7 minutes.
    [0034] The mixture is then pressed, preferably under a pressure of 4-25 tonnes / piece in friction pads, in the form of preforms or discs, using a pressing operation at room temperature. The preforming time is approximately 5 seconds. Variations in the process may include filling the mixture in the press mold without compression, either directly or through the use of a liquid binder system.
    [0035] The preforms, or disks, are then placed in a hot block mold, with a metal counterplate on one side and cured by means of hot-dip to connect, by curing, the backing plate to form the final brake pad. The friction material can be coupled directly to the backing plate or using a lower layer material, as is well known in the industry. The pressing is preferably carried out at a pressure of 5-50 tons / piece and at a temperature of 129.4-146.1 ° C (265-295 ° F). The total pressing time is approximately 250 seconds.
    [0036] Tablets destined for the market still undergo a post-cooking operation. The cooking of the friction plate and backing plate is preferably carried out in a standard convection oven at a temperature of 165.6-187.8 ° C (330-370 ° F). The total post-cooking time is approximately 6 hours. Brake pads for the market also undergo one or more finishing operations before being packaged for commercialization.
    [0037] Brake pads can be formed by a process that essentially consists of the mixing, pressing and baking steps described above, meaning that other process steps, significant or costly, are not required. The excellent processability of the inventive friction material was completely unexpected and contributes to a 30-50% reduction in costs over the prior art.
    [0038] The following examples 1,2, and 10, provide exemplary inventive friction materials prepared using the present invention and having sufficient performance characteristics. Examples 3-9 provide comparative friction materials. The friction materials in each example were processed and formed into brake pads according to the mixing, pressing, curing and post-cooking operations described above. Each of the examples was also evaluated for certain manufacturing characteristics including mixing, preforming, pressing, physical hardness and physical compression. The friction materials were further evaluated for bonding to the plate at room temperature and at 129.4-146.1 ° C (265-295 ° F), as well as certain performance characteristics, including friction pad life, pad wear , rotor wear characteristics and costs. All compositions described below are expressed in% by volume, based on the total volume of the final product of the friction material after processing, and have been rounded to the nearest whole number for simplicity. INVENTIVE EXAMPLE 1
    [0039] It was found that the friction material of example 1 had good general characteristics of manufacture and performance, similar to those of friction materials containing copper or containing titanate. The friction material provided the same level of friction, pellet life, noise and other typical performance characteristics for asbestos-free friction materials containing copper and titanate. The friction material also provided excellent process capabilities, including high efficiency and unexpectedly low residue rates. INVENTIVE EXAMPLE 2

    [0040] Some variations in example 2, compared to example 1, included extremely low void volumes in the tablet. Generally, a very desirable characteristic for brake pads is low noise levels, as braking noise is one of the common causes of customer complaints related to the brake system. Low level voids also correlate with very rigid inserts, with very low compressibility values. This material showed the lowest compressibility properties of all the tested examples, demonstrating that the high level of binder resin affects this property. The binding to the plate, both at room temperature, and at 129.4- 146.1 ° C (265-295 ° F) was excellent, and very low pressures were required to achieve acceptable insert integrity. However, due to low compressibility and in particular low voids, potentially causing noise, a binder level above 24%, by volume of the friction material, would be undesirable. For this reason, it is believed that 24% binder by volume is the maximum level of binder that can be used in a percentage of the final friction composition volume. COMPARATIVE EXAMPLE 3

    [0041] The fine friction composition of example 3 had generally good performance characteristics, although the preform and bonding characteristics at 129.4-146.1 ° C (265-295 ° F) were not as good as the friction material in the mixture of example 1. It is believed that the binder 15% by volume, or less, decreases the bonding characteristics of the friction material and, especially, the bonding of the friction material to the backplate at 129.4-146 , 1 ° C (265-295 ° F). The friction material of example 3 did not provide the excellent bonding characteristics provided by example 2. COMPARATIVE EXAMPLE 4

    [0042] Example 4 reduces the fiber content to 3% by volume. In comparison with the friction material of example 1, the insert was difficult to be preformed, as well as having low physical compression and, in a way, it was a little difficult to connect it to the backplate at 129.4-146.1 ° C ( 265-295 ° F). The cured friction material was unacceptably brittle. Therefore, the inserts must include more than 3% and preferably 5% or more per volume of fiber, to provide acceptable performance characteristics. COMPARATIVE EXAMPLE 5

    [0043] The material of example 5 employed a high level of fiber, which produced good performance characteristics, but some difficulties in the process. During processing, the high level of the fiber made this material difficult to mix, but dividing the mixture into smaller batches helped. However, smaller batches would significantly increase the cost of manufacturing the material and would therefore be undesirable. Therefore, the friction material must have less than 13% by volume of fibers in the total composition and, more particularly, approximately 5-9% by volume of the total composition. COMPARATIVE EXAMPLE 6

    [0044] Example 6 generally had good general characteristics. However, pressing and pressing of the processing stage were negatively affected by the lack of lubricants. Without lubricants, it was found that the preforms were not as stable as when pressed at low pressures and that the pressure had to be significantly increased to maintain the integrity of the preform and that the parts had to be cured by pressing for longer. It is believed that the presence of lubricants is not only important for the frictional wear properties of brake pads when manufactured, but also during the preforming and pressing stage as the compaction of the ingredients can be influenced by the presence of lubricating materials. COMPARATIVE EXAMPLE 7

    [0045] In example 7, the quantity of lubricant was increased to 6% by volume. It was found that the increase in lubricants requires longer and longer curing and pressing times than in example 1. The extremely high level of lubricants influenced the compaction of the ingredients during the preforming stage, while the remaining performance characteristics were good. For purposes of efficient manufacturing, the material should have less than 6% by volume of the total composition lubricant, and preferably less than 4% by volume of the total friction material composition. Also, as lubricants are expensive, when combined with processing difficulties, it is desirable to minimize the amount of lubricants added. Therefore, at least some lubricant that allows better pressing is desirable, but it is also desirable to keep the amount of lubricants at approximately 6%, or less, and preferably less than 4% by volume. COMPARATIVE EXAMPLE 8

    [0046] The friction material formed in example 8 had the lowest levels of abrasive material. The performance characteristics related to friction became worse, as the material had one of the lowest levels of friction coefficient measured among all variations of examples. However, it is believed that other parameters can be adjusted to keep the friction coefficient within the desired range. Surprisingly, during the processing and formulation stage of the brake pad, the connection to the backplate and in particular the connection on the rear link retaining plate at 129.4-146.1 ° C (265-295 ° F), also was negatively affected. Therefore, it is believed that the total amount of abrasives should be at least greater than 9% by volume of the total composition. COMPARATIVE EXAMPLE 9

    [0047] The friction material of example 9 increased the level of abrasive material to 22%. The performance and preforming characteristics were good. The formulation processed reasonably well with ease of mixing, preforming and pressing cycles. The hardness of the tablets was one of the highest of the materials tested in the examples. A negative aspect of using such high-level abrasives is the cost. It is believed that a friction material having approximately 22%, or less, abrasives is preferable to minimize the cost even though the friction material may have otherwise acceptable processing and performance characteristics. INVENTIVE EXAMPLE 10

    [0048] The friction materials including the components of the exemplary composition within the ranges of example 10 were processed, formed into brake pads and tested as described above. Like the friction material of example 1, the friction materials of example 10 provided excellent performance characteristics. The friction materials provided the same level of friction, pad life, noise, stopping ability, longevity, rotor wear, brake dust, staining and other typical performance characteristics for asbestos-free materials , without copper or titanate.
    [0049] The friction materials of example 10 also provided excellent process capabilities, including process efficiency and unexpectedly low residue rates.
    [0050] The total waste rate of the friction materials of example 10 was determined to be 0.6% total. Residue rates due to nofills / tearout friction were 0.10%; installation 0.10%; cracks 0.01%; friction bubbles 0.03%; and other waste 0.36%.
    [0051] The friction materials of example 10 were formed in brake pads and passed the following application tests for vehicles: FMVSS 135 (14% stopping distance margin); vehicle life test (48,280.32 kilometers (30,000 miles), minimum); and vehicle noise test (zero noise).
    [0052] Brake pads formed from the friction material of example 10 were also produced at a fraction of the cost of brake pads formed from the prior art friction materials, such as those including copper and titanates. Brake pads formed from the inventive friction materials of example 10 were 30-50% cheaper than those formed from friction materials containing copper and titanates.
    [0053] The foregoing description describes exemplary embodiments of the present invention. One skilled in the art will readily recognize from this description, and the accompanying drawings, and claims, that various changes, modifications and variations can be made if it deviates from the scope and spirit of the invention, as defined by the claims.
    权利要求:
    Claims (2)
    [0001]
    1. Friction material for a brake, characterized by the fact that it comprises, in percentage (%) by volume of said friction material: a binder forming 21% by volume, said binder being a phenolic resin; a fiber forming 7% by volume, said fiber being an aramid; a lubricant forming 2-4% by volume, said lubricant being a mixture of antimony trisulfide and at least one metal sulfide different from said antimony trisulfide; wherein said antimony trisulfide of said lubricant forms 2% by volume, and said metal sulfide of said lubricant forms 2% by volume; an abrasive forming 15% by volume and being a mixture of mineral fiber, magnesium oxide, and mica; wherein said mineral fiber of said abrasive forms 5% by volume, said magnesium oxide of said abrasive forms 5% by volume, and said mica of said abrasive forms 5% by volume; a filler forming 53% by volume, said filler being a mixture of rubber powder, graphite, petroleum coke, barites, friction dust, and hydrated lime; wherein said rubber powder of said filler is nitrile rubber and forms 9% by volume, said graphite of said filler forms 6% by volume, said petroleum coke of said filler forms 6% by volume, said barites of said filler they form 21% by volume, said friction dust of said filler forms 9% by volume, and said hydrated lime of said filler forms 2% by volume; metallic fibers forming 0% to no more than 0.2% by volume; titanates forming 0% to no more than 0.2% by volume and copper forming 0% to no more than 0.2% by volume.
    [0002]
    2. Method of forming a brake pad, the friction material of which is as defined in claim 1, characterized by the fact that it comprises the steps of: mixing a binder, a fiber, a lubricant, an abrasive, and a filler to form a homogeneous mixture comprising, based on the total volume of the mixture: the binder forming 21% by volume and being a phenolic resin; the fiber forming 7% by volume and being an aramid; the lubricant forming 4% by volume, the lubricant being a mixture of antimony trisulfide and at least one metal sulfide different from antimony trisulfide, the antimony trisulfide of the lubricant forming 2% by volume, and the metallic sulfide of the lubricant forming 2% in volume; the abrasive forming 15% by volume, the abrasive being a mixture of mineral fiber, magnesium oxide, and mica; the mineral fiber of the abrasive forming 5% by volume, the magnesium oxide of the abrasive forming 5% by volume, and the mica of the abrasive forming 5% by volume; the filler forming 53% by volume, the filler being a mixture of rubber powder, graphite, petroleum coke, barites, friction dust, and hydrated lime; the filler rubber powder being nitrile rubber and forming 9% by volume, the graphite of the filler forming 6% by volume, the petroleum coke by the filler forming 6% by volume, the barites of the filler forming 21% by volume, friction dust from the filler forming 9% by volume, and the hydrated lime from the filler forming 2% by volume; metallic fibers forming 0% to no more than 0.2% by volume; titanates forming 0% to no more than 0.2% by volume and copper forming 0% to no more than 0.2% by volume; press the homogeneous mixture under a pressure of 4-25 tons / piece, at room temperature, to form a friction pad of the mixture; press the friction pad and a backing plate together, under a pressure of 5-50 tonnes / piece at a temperature of 129.4-146.1 ° C; and bake the friction pad and the backing plate pressed to a temperature of 165.6-187.8 ° C.
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    同族专利:
    公开号 | 公开日
    KR102116768B1|2020-06-01|
    EP2745027B1|2017-07-19|
    CN103906942B|2016-09-07|
    JP2014527566A|2014-10-16|
    WO2013048627A1|2013-04-04|
    EP2745027A1|2014-06-25|
    BR112014003684A2|2017-12-12|
    RU2570515C2|2015-12-10|
    CN103906942A|2014-07-02|
    KR20140053254A|2014-05-07|
    RU2014107185A|2015-09-27|
    引用文献:
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    法律状态:
    2018-12-11| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2019-10-29| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2019-12-03| B25D| Requested change of name of applicant approved|Owner name: FEDERAL-MOGUL LLC (US) |
    2019-12-24| B25A| Requested transfer of rights approved|Owner name: TENNECO INC. (US) |
    2020-05-05| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application according art. 36 industrial patent law|
    2020-08-04| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application according art. 36 industrial patent law|
    2020-11-17| B09A| Decision: intention to grant|
    2020-12-29| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 14/08/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/212,445|2011-08-18|
    US13/212,445|US8863917B2|2008-10-03|2011-08-18|Friction material for brakes|
    PCT/US2012/050686|WO2013048627A1|2011-08-18|2012-08-14|Friction material for brakes|
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