2508results about "Friction lining" patented technology

Novel composite disc brake rotor assemblies are provided, along with novel and efficient methods for manufacturing them. Preferably, the rotor assemblies comprise annular wear plates formed of particle reinforced aluminum-based metal matrix composite (MMC), ceramic matrix composite (CMC), or of ‘carbon graphite foam.’ The wear plates, made of a first material, are attached to annular surfaces of a central rotor, made of a second material, by fusing bonding layers between the wear plates and the rotor surfaces. The bonding layers are comprised of at least one of a metal alloy having a melting temperature lower than that of either the first or second materials, and a high-temperature adhesive. Preferably, the wear plates comprise projections that are positioned within adjacent receiving recesses in the center rotor. The bonding layers and projections enhance thermal and acoustical transference between the wear plates and the center rotor section. Carbon graphite foam provides for substantially enhanced heat transference. Use of the fusable binding layer, or adhesive provides for an efficient, low cost method of manufacturing for composite disc brake rotor assemblies.

A friction material comprising a fibrous reinforcement, a friction modifier and a binder, characterized by being free from asbestos fiber and containing, as the organic fibrous reinforcement, a mixture of a dry aramid pulp with at least one member selected from the group consisting of a wet aramid pulp, a woodpulp and an acrylic pulp.

Carbon nanotubes are incorporated in the fiber structure by growing them on the refractory fibers of the substrate so as to obtain a three-dimensional substrate made of refractory fibers and enriched in carbon nanotubes. The substrate is densified with a matrix to form a part of composite material such as a friction part of C/C composite material.

The invention relates to a method for preparing a C/SiC composite material through a low-cost fused silicon impregnation method, which comprises the following steps: performing calcining pretreatment on a carbon felt or graphite felt at 400-600 temperature; immersing the pretreated carbon felt or graphite felt in a melamine and boric acid solution, thus coating a boron nitride protective layer; immersing in a carbon/silicon carbide slurry water solution, performing impregnation to ensure that pores of the carbon felt or graphite felt are fully filled with carbon/silicon carbide, placing in a sintering furnace, and performing primary fused silicon impregnation treatment at 1600-1800 DEG C; immersing in liquid phenolic resin, and performing carbonization treatment under the protection of an inert atmosphere at 800-1000 DEG C to ensure that all the resin is carbonized; and finally, performing secondary fused silicon impregnation treatment to ensure that carbon produced by carbonization of the resin totally reacts with silicon to generate silicon carbide, thus obtaining the C/SiC composite material. The obtained C/SiC composite material is high in density, low in air pore and free silicon content, and favorable in material strength, toughness and frictional wear performance, and can be used for manufacturing of brake pads.

This invention relates to a preparation technology for producing special products with plastic substances characterizing in mixing an adhesive agent, strengthened fibers, a regulator for friction performance and inorganic fillers in good match to process the surfaces of them with an anti-high temperature coupler to be hot-pressed to a format to get a high performance car brake plate of environmental protection, which replaces that made of asbestos fiber and overcomes the shortcoming of declining at high temperature of the asbestos car brake plates.

The invention discloses a method for preparing a nanoparticle-modified friction material, which comprises the following steps: dissolving a resin in a solvent to obtain solution of the resin, uniformly dispersing nanoparticles in the solution of the resin, soaking reinforcing fibers in the solution and adding surfactant to allow the resin, the nanoparticles and the reinforcing fibers to be tightly bonded and uniformly disperse; and mixing the resin-coated nanoparticles and the resin-coated reinforcing fibers with a friction performance regulator and a filler, uniformly stirring the mixture and drying the mixture. In the method, the flowability of the solution of the resin is used to coat the nanoparticles and the reinforcing fibers, so the uniform mixing of the nanoparticles, the fibers and the resin is realized; the bonding strength of the nanoparticles, the fibers and the resin is increased under the action of the surfactant; and the friction performance and the service life of a brake pad can be improved on the basis of reducing the dosages of the nanoparticles, the reinforcing fibers and the resin. The friction material of the invention can be widely used in the preparation of brake pads of motor vehicles, brakes of machine tools and electrodes, clutch liners and the like.

An air-cooled brake rotor system defining an inter-rotor disk slot through which spacers in the form of turbine or fan vanes propel air when the brake rotor system is turned. An inner disk brake rotor plate is attached to a hub which in turn may be attached to an axle on a vehicle such as an automobile. Pins having ends of opposite threading are used to connect the inner rotor to the outer rotor. The outer rotor is spaced apart from the inner rotor by means of spacers which are shaped to propel air through the slots defined between the two rotors. The spacers are also configured so that compression of the two rotors by a caliper system always serves to have a spacer beneath the area engaged by the brake pad to provide mechanical support for the rotor system. Each rotor generally has defined in it venting holes and inscribed debris-channeling slots in an arcuate, volute, or turbinate manner. An enhanced braking system experiencing lower heat retention is thereby attained.

The disclosure relates to structures and a method for providing an air cooled rotor with ceramic-metal composite friction surface plates, and in particular to a brake rotor including a rotor hat; a ventilation disc having a plurality of cooling vanes extending therefrom; a ceramic matrix composite (CMC) friction surface plate on each side of the ventilation disc; and a fastener for holding the CMC friction surface plates and the ventilation disc to the rotor hat.

Ceramic matrix composites and fiber reinforced ceramic matrix composite components of brake systems and other friction tolerant composite articles of this invention are made by providing a fiber preform, coating the fibers with an interface layer of carbon or ceramic, infiltrating the coated fiber preform with a composition comprising a liquid ceramic forming polymer including friction controlling additives, and pyrolyzing the polymer in the infiltrated preform to form a ceramic matrix around the fibers of the preform.

The invention discloses a prescription of a ceramic-based friction material used in a vehicle braking friction pad, comprising the components (by weight): adhesives 5 percent-15 percent, intensifier 23.5 percent-33.5 percent, grinding aid 0 percent-7 percent anti-wearing lubricant 11.3 percent-21.3 percent, elastic toughening agent 5.7 percent-15.7 percent and filling material 27.5 percent-37.5 percent. The total amount of the components is 100 percent. The materials of the invention can be processed and molded into the vehicle braking pad that is applicable to friction braking on a vehicle braking device. The anti-wearing performance of the pad can be greatly enhanced, thereby reducing noise pollution and promoting the performance of the braking system of the vehicle.

A non-asbestos friction material includes at least one binder, fiber, lubricant, abrasive and titanate in a range of volume fractions in combination with other materials such as fillers and is substantially free of copper and asbestos.

A multi-clutch arrangement, especially a dual clutch for motor vehicles, comprising a first clutch area with a first pressure plate arrangement, with a first opposing support arrangement, and with a first clutch disk arrangement , which can be clamped between the first pressure plate arrangement and the first opposing support arrangement to transmit torque via the first clutch area; and a second clutch area with a second pressure plate arrangement, with a second opposing support arrangement, and with a second clutch disk arrangement, which can be clamped between the second pressure plate arrangement and the second opposing support arrangement to transmit torque via the second clutch area. A torsional vibration damper arrangement is assigned to at least one of the clutch areas, and where-relative to an axis of rotation (A)-the torsional vibration damper arrangement is arranged at least partially in the axial area of the first clutch area and/or of the second clutch area.

A method and apparatus for combining raw fibrous and binding materials in a single mixing step (Step S3), followed by consolidation (Step S5) so as to greatly shorten the overall cycle time to a finished fiber-reinforced composite part. Chopped fibrous materials and binder materials are deposited sequentially onto a belt conveyor (Step S2) so that the materials are successively layered, one on top of each other in a predetermined ratio, and subsequently mixed (Step S3) to achieve uniform dispersion throughout. The mixed materials are then deposited into a rotating mold (Step S4) to further ensure uniform dispersion of fibrous and binder materials. Impregnation of the fibrous materials with the binder material occur in-situ as the uniformly mixed materials are heated and subsequently compacted in the mold (Step S5) to obtain the desired shape of the fiber-reinforced composite part.

The present invention is directed to a unique solution for caliper assemblies, brake pads utilized in such caliper assemblies, support structures utilized in caliper assemblies and disc brake systems containing such caliper assemblies which utilize push pull or pull push abutment designs.

The invention provides a method for manufacturing a coulomb damped disc brake rotor, including the steps of: (A) providing a mold having the general shape of the coulomb damped disc brake rotor; (B) placing a coulomb damper insert having a generally annular body and at least one tab extending generally radially from the generally annular body, wherein the at least one tab operates to locate the coulomb damper insert within the mold, and wherein the at least one tab at least partially defines an orifice with its major axis generally coincident with the periphery of the coulomb damped disc brake rotor; and (C) causing casting material to enter the mold to substantially encapsulate the coulomb damper insert with the casting material to form a rotor cheek of the coulomb damped disc brake rotor. A coulomb damper insert and coulomb damped disc brake rotor are also disclosed.

A composition brake shoe for use on a railway vehicle for reconditioning a wheel tread surface during a normal braking application on such railway vehicle is provided. The composition brake shoe includes a backing plate having a stirrup and a brake surface having a predetermined configuration and a predetermined surface area. It further includes a first friction type composition material extending over the surface area of such brake surface of such composition brake shoe. The composition brake shoe further contains a second friction type material, formed as at least one discrete insert, having a predetermined shape and molded into such first friction type composition material. Such second friction type material initially being completely embedded within such first friction type composition material. One surface of such at least one discrete insert being incrementally exposed as such first friction type composition material is eroded away due to frictional engagement with such wheel tread surface during normal braking operations, such second friction type material exhibiting greater abrasive properties than such first friction type composition material. Such at least one discrete insert of such second friction type material is bonded to such backing plate.

A device for selectively controlling and varying surface texture includes a body having at least one surface, and an active material in operative communication with the at least one surface, wherein the active material is configured to undergo a change in a property upon receipt of an activation signal, wherein the change in a property is effective to change a texture of the at least one surface.

The invention discloses an environmental ceramic base friction material free of copper or metal and a preparation method of the material. The environmental ceramic base friction material is characterized by comprising the following components by weight percent: 6-12% of phenolic resin, 2-10% of ceramic fiber, 2-8% of inorganic fiber, 2-10% of rubber, 4-12% of graphite, 10-25% of potassium titanate lamella, 3-15% of mineral fiber, 4-20% of metal sulfur compound, 6-20% of grinding aid and 5-20% of filler. The prepared friction material has excellent friction and wear properties, high heat-conducting property, excellent high-temperature decline property, stable friction coefficient, and excellent noise performance.

The subject invention generally relates to a disc brake pad which has reduced brake squeal in response to a braking event by the incorporation of a relieved portion to the center section of a friction pad along an outer edge or inner edge thereof, or along both edges. The invention is a disc brake pad which includes a backing plate and friction pad attached to the backing plate.

A friction material for brakes is formed by molding and hardening a raw material composition mainly containing a fibrous substrate, a friction adjuster, an organic filler, an inorganic filler and a binder in the form of a thermosetting resin. The friction material further contains aggregates of fine alumina particles, the aggregates having an average particle diameter of 30 to 60 μm, and the alumina particles having a particle diameter of 0.2 to 0.9 μm.

A method in which at least one piezoceramic sensor, which converts every mechanical force to which it is subjected into an electrical signal and having a Curie temperature higher than 200° C., is solidarized directly onto the surface of a metal support element of a vehicle braking element, which during use faces a vehicle element to be braked. While in contact with such a surface, an electrical circuit is implemented that picks up and eventually processes the electrical signal, the electrical circuit being connected with a connector integrated with the metal support element. An electrically insulating layer sandwiches the at least one piezoceramic sensor and the electrical circuit, and a block of friction material with an underlying damping layer is formed upon the electrically insulating layer. After forming the block of friction material, the piezoceramic sensor is polarized by applying a predetermined potential difference thereto by means of the connector.

The invention discloses a copper-free ceramic friction material with little falling ash and a preparation method thereof. The copper-free ceramic friction material with little falling ash is prepared by mixing, shaping and thermally processing the following raw materials in percentage by weight: 5 to 14 percent of adhesive, 20 to 45 percent of reinforcing material, 10 to 40 percent of ceramic material, 10 to 18 percent of lubricant and the balance of filler, wherein nitrile rubber modified phenolic resin and nitrile rubber powder are used as the adhesive; the reinforcing material is one or a mixture of more of aramid fiber, carbon fiber, steel fiber, foam iron powder and aluminum oxide fiber; the ceramic material is one or a combination of more of molybdenum disulfide, magnesium oxide andferrous disulphide; the lubricant is the mixture of graphite and mica; and the filler is the mixture of composite filler, barite, friction powder and aluminum powder. The material has high friction performance, low brake noise and high heat fading resistance, and particularly shows high performance in aspects of wear resistance, long life and great reduction in the falling ash of a wheel hub; therefore, the material can meet both the requirement of a modern automobile braking system on operating conditions and the requirement on economy and environment friendliness when an automobile is used.

The invention relates to a friction material used in express train brake and its method for preparing. The materials include rubber, gum cement, resin, friction-type mix, fibrous material and mineral filler. It is characterized in that the materials also include tripoly cyanoamine cyanurate, mineral filler, didymia rare-earth powdered ore, lanthanum chlor rare earth powdered ore, the proportion of the weight part of each component is: rubber of 5-10 parts,fibrous material of 8-13 parts, gum cement of 0.2-0.6 part, mineral filler of 2-7 parts,resin of 5-12 parts, tripoly cyanoamine cyanurate of 0.5-1 parts,and friction-type mix of 40-50 parts. The method for preparing includes preparing moulded materials, compression molding and after-treatment. The invention reduces the high-temperature degeneracy of the friction material because it has selected tripoly cyanoamine cyanurate which has self-lubricating property and is of good fire-retardancy as addition agent and improves the cooperating knife-bar among gasket materials because it has added rare-earth powdered ore. The method for preparing moulded materials adopting rubber-making technology is of simple technology and suitable for commercial manufacture, and is of zero environmental contamination, zero noise and nuisance free.

This invention provides carbon composite materials, which comprise metal carbide particles, at least the particle surfaces or the entirety of which are metal carbides, synthesized in situ from a metal source, i.e., at least one member selected from the group comprising metal particles, metal oxide particles, and composite metal oxide particles, and a carbon source, i.e., a thermosetting resin, dispersed in a carbon, carbon fiber, or carbon/carbon fiber matrix, and contain no free metal particles. This invention also provides a method for producing such composite carbon materials, which enables the production of carbon composite materials having a high coefficient of friction, high thermostability, and abrasion resistance.

A disk brake device includes a pair of brake disks and right and left pairs of pads. Each pad includes a twisting compliant section that extends along a line inclined by an angle relative to a radial direction of the corresponding brake disk. The twisting compliant section facilitates the twisting of the pad about the compliant section. The twisting compliant sections of the right inner pad and the left inner pad are inclined in opposite directions relative to the twisting compliant sections of the right outer pad and the right inner pad. The twisting compliant sections of the right inner pad and the left inner pad are inclined in substantially the same direction with one another.

A wet clutch friction plate comprises a metal plate connected to a driving side, friction material layer(s) fixed to one or both side surface(s) thereof. A discharge groove is formed on one of the friction material layers and has an inclination against the direction of rotation from the inner peripheral side toward the outer peripheral side, for discharging lubricating oil from the inner peripheral side to the outer peripheral side, and an inflow groove is formed on the same or other friction material layer to face the discharge groove to receive the lubricating oil from the outer peripheral side to the inner peripheral side. A multiple disc friction clutch apparatus fastened or released by an action of a piston, comprises a clutch drum, a clutch hub, driven plates spline-fitted on the clutch drum, and drive plates spline-fitted on the clutch hub, the drive plate being the wet clutch friction plate.

A caliper assembly comprising: a brake pad comprising a carrier plate having two opposing faces and a top edge a bottom edge and two opposing side edges, wherein on one face is friction material and on the opposing face is a projection adapted to seat in a matched hole or recess in a caliper body, the two opposing side edges each having an ear which is adapted to seat in pad locator indentations in a support structure; a support structure comprising a recess for housing at least one brake pad and at least two pad locator indentations adapted for receiving the ears located on the two opposing sides of the brake pad and at least two caliper body locator indentations for seating two ears defined by the caliper body; and a caliper body having a hole or recess adapted for seating the projection on the opposing face of the brake pad and having two ears on each opposing side which are adapted to seat in the caliper body locator indentations of the support structure; wherein the ears of the brake pad are seated in the pad locator indentations of the support structure, the projection on the opposing face of the brake pad is seated in the hole or recess located in the caliper body, and a clip which engages the opposing face of the brake pad and the caliper body and holds the brake pad in position with respect to the caliper body and the ears of the caliper body are seated in the caliper body locator indentations in the support structure.

The invention discloses a method for making a clutch facing by using phenolic resin as adhesive. The method comprises the following steps that: (1) the latex modified water soluble phenolic resin is used as the adhesive to make the clutch facing, and water is used as solvent, and the adhesive and the solvent are mixed by stirring and prepared into pulp; (2) fibers are impregnated in the pulp; (3) fibers containing the pulp are dried; (4) the dried fibers containing the pulp are wound to become blanks; (5) blanks are heat moulded; (6) the clutch facing is obtained after subsequent treatments. The method of the invention has the advantages of saving a large amount of organic solvent, avoiding the environmental pollution caused by the consumption and the volatilization of the solvent, greatly saving the energy used for the preparation of the pulp and saving equipment cost on aspects of safety, fire fighting and environmental protection and management cost; moreover, the clutch facing made by the method of the invention is excellent in performance.

PCT No. PCT/FR96/01598 Sec. 371 Date May 13, 1998 Sec. 102(e) Date May 13, 1998 PCT Filed Oct. 14, 1996 PCT Pub. No. WO97/18176 PCT Pub. Date May 22, 1997A plurality of substrates (10) are disposed in alternation and in contact with layers (12) which constitute sources of metal-based composition, each layer comprising a majority phase formed by the metal-based composition and a minority phase suitable for forming a structure for retaining and draining the metal-based composition when it is in the molten state. The batch is heated to a temperature greater than the melting temperature of the metal-based composition such that the metal-based composition in the molten state can migrate from each source through the adjacent surface of the, or each, substrate adjacent to the source towards the inside of the substrate. The invention seeks in particular to incorporate a silicon-based composition in a thermostructural composite material, in particular a carbon-carbon composite material for siliciding purposes.

A disc brake enables a parking apparatus to be operated via actuation of an electric motor, thereby permitting easy operation of the parking apparatus. The disc brake comprises a piston to compress a friction pad used for braking of a disc, a caliper housing to receive the piston such that the piston moves linearly therein, and having a cylinder section to which a hydraulic pressure for braking is applied, an actuation shaft rotatably installed within the cylinder section, and having a male screw formed thereon, a compression sleeve installed within the piston to compress or release the piston while linearly moving therein by rotation of the actuation shaft, and having a female screw formed thereon to engage with the male screw of the actuation shaft, an electric motor to rotate the actuation shaft, a multi-stage reduction gear train to transmit rotational force of the electric motor to the actuation shaft. The multi-stage reduction gear train has a central axis deviated from that of the electric motor, and a shaft connected with a shaft of the electric motor via a power transmission unit