59results about How to "Improved resistance to heat fading" patented technology

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 invention discloses a reinforce wear-resistant automobile brake composite material which is prepared from the following components in parts by weight: 85-100 parts of resin matrix, 100-150 parts of composite reinforcing fiber, 80-120 parts of filler, 25-40 parts of toughening material, 6-10 parts of curing agent, 4-6 parts of curing accelerator, 30-85 parts of frictional property regulator, 30-40 parts of noise reducer and 4.5-6 parts of releasing agent. The resin matrix is reinforced by the composite reinforcing fiber and matched with proper frictional property regulator, filler, toughening material and noise reducer to display the synergic coupling actions among the resin matrix, reinforcing fiber, filler and frictional property regulator, thereby obtaining the novel automobile brake composite material which has the advantages of stable friction factor, small wear rate, high heat fade resistance, favorable braking effect, shock absorption, noise reduction, high mechanical strength, low cost, long service life and favorable braking property at different temperatures.

The invention discloses a modified phenolic resin adhesive for a friction material and a preparation method for the modified phenolic resin adhesive. The method comprises the following steps of: mixing 100 mass parts of phenol, 60 to 120 mass parts of 37 mass percent formaldehyde solution, 2 to 20 mass parts of amine substance and 8 to 40 mass parts of cardanol uniformly, dripping 1 to 20 parts of composite catalyst, heating to the temperature of between 80 and 105 DEG C, and performing constant-temperature reaction for 0.5 to 2 hours; and adding 0 to 10 parts of acid catalyst, continuously performing constant-temperature reaction for 1 to 2 hours to obtain orange milky dope, washing the orange milky dope for 2 to 5 times in water of 60 to 70 DEG C, drying, dehydrating, and thus obtaining the cardanol and amine substance modified phenolic resin adhesive. The amine substance can be well dissolved, so that the reaction rate is quickened; the toughness of the modified phenolic resin adhesive is further enhanced by adding powdery nitrile rubber; and the friction material prepared by using the modified phenolic resin adhesive has the advantages of low abrasion rate, long service life, high toughness, high-temperature resistance, high-strength impact resistance and low noise.

The invention discloses a magnetic brake and friction brake combined mixed brake and an operating mode switching method thereof. A brake caliper body side is provided with a magnetic brake fixing frame which is fixedly connected with a steering knuckle; the magnetic brake fixing frame is axially fixedly connected with the outer ends of each permanent magnet and each magnetic conducting block; an inner end side of each permanent magnet is provided with an iron core; an inner end of the iron core is fixedly connected with a magnetic conducting plate, and a side face of the iron core is connected with an upper end of a push rod; a lower end of the push rod extends into an oil cylinder; a coil winding is wound outside the iron core; a pair of permanent magnets, iron cores, magnetic conductingplates, coil windings, push rods and oil cylinders are arranged and symmetrically distributed on two sides of a brake disc; and both ends of each oil cylinder are provided with an oil way interface. Retarding brake can be switched back and forth among electromagnetic brake, permanent magnet brake and electromagnetic and permanent magnet brake, the brake requirement of an automobile under different working conditions is met, braking force of electromagnetic and permanent magnet superposed brake is higher than that of only permanent magnet brake, and more needed brake torque in the process of braking the automobile can be borne; and heat-resistant recession of the brake and riding comfort are improved.

The invention discloses a heat-resistant flexible transparent conductive film and a preparation method of the film. According to the film, the surface of PET is coated with coating, and then the film is prepared after being dried . According to the formula of the coating, the coating is composed of nanometer silver wires, oleoresin, additive powder, flatting agents and a proper quantity of organic solvents. The nanometer silver wires excellent in electrical conductivity and mixed additives composed of carbon fibers, nanometer limestone powder, nanometer palygorskite powder, nanometer aluminum oxide powder and propyl gallate are adopted for improving the electrical conductivity and the heat resistance of the film. The heat-resistant flexible transparent conductive film is low in cost and raw materials are easy to obtain.

The invention provides a preparation method of friction particles. The method comprises the following steps of: uniformly mixing the friction particles as raw materials with water to obtain slurry, wherein the friction particles as the raw material contain fibers, resin, a water-soluble adhesive and a filler, and the weight ratio of water to the water-soluble adhesive is (1-3):1; pelletizing the slurry to obtain particles; and drying the particles at the temperature of between 100 DEG C and 120 DEG C for 30-60 minutes. The invention also provides friction particles obtained by the method provided by the invention. The invention provides a friction material composition, wherein the friction material composition contains the friction particles, tubular fibers, powder resin and a powder filler; and the friction particles are the friction particles provided by the invention. The invention also provides a friction material for preparing a brake pad. The friction material is obtained by performing hot press molding and thermal treatment on the friction material composition, wherein the friction material composition is the friction material composition provided by the invention.

The invention discloses a method for preparing a clutch facing through taking water soluble phenol-formaldehyde resin as an adhesion agent. The method adopts the water soluble phenol-formaldehyde resin which is multiply modified by polyvinyl alcohol, nanoscale attapulgite and micron-order copper powder as the adhesion agent, the water soluble phenol-formaldehyde resin, a friction performance conditioning agent and water are mixed to produce slurry, fibers are soaked in the slurry, are dried and are wound to form a parison, the parison is then subjected to hot-press forming to form the facing, grinding and drilling are carried out after the thermal treatment, the clutch facing is obtained. The modified adhesion agent has high solubility, cohesiveness, toughness, heat resistance, thermal fading resistance and abrasion resistance; and the clutch facing which is produced through the adhesion agent is low in cost, green and environment-friendly, can bear impact force during the processing and using processes, cannot crack and has high thermal stability, high and stable friction coefficient and low abrasion resistance.

The invention discloses a copper-free ceramic type friction material and a preparation method thereof. The friction material at least comprises 2 to 30 mass percent of alkaline earth-based metallic compound and 2 to 30 mass percent of carbon fiber, wherein the alkaline earth-based metallic compound is MxFeyTiOz, M is alkaline earth metallic element, namely Be, Mg, Ca, Sr or Ba, x is 0.2 to 2, y is 1 to 2, and z is 4 to 16. The friction material prepared by the method has the advantages of: high friction and wear property, higher heat conductivity, high performance of resisting high-temperature recession, and capacity of efficiently reducing the temperature of a friction surface in the braking process.

The invention discloses an environment-friendly type ceramic-based friction material, and is characterized in that the ceramic-based friction material includes the following materials in parts by weight: 16-31 parts of cashew nut shell oil modified phenolic resin, 3-18 parts of carbon fiber, 12-30 parts of organosilicon modified phenolic resin, 25-60 parts of graphite, 3-9 parts of molybdenum disulfide, 11-14 parts of a talc powder, 3-9 parts of mica, 5-18 parts of zircon, 35-60 parts of ceramic fiber, 20-60 parts of butadiene-acrylonitrile rubber, 10-20 parts of a scallop shell powder, 3.5-7 parts of a zeolite powder, 1.5-3.9 parts of zinc sulfide, 1-5 parts of hornblende, 5-11 parts of borax, 3-6 parts of titanium oxide, 0-2 parts of quartz sand, 4-8 parts of a boride, 6-18 parts of silicon nitride, and 1-5 parts of titanium carbide. The ceramic-based friction material has the beneficial effects that the ceramic-based friction material has excellent heat-conducting property, ensures the stability of the friction material, improves heat fading resistance of the friction material, provides good and stable braking force output, and has longer service life and comfort.

The invention relates to the technical field of vehicle brake, in particular to a double-motor brake actuation mechanism of a vehicle decoupling distribution brake system. The mechanism comprises a brake disc, a brake actuation part and a regeneration motor part; the brake actuation part includes a stepper motor and a brake clamp body; two ends of the brake clamp body are respectively positioned on two sides of the brake disc; the brake clamp body and the stepper motor are both slidingly connected with a shell of the brake actuation part; a friction block is arranged at one end of the brake clamp body; the other end of the brake clamp body is connected with the stepper motor; the stepper motor is in transmission connection with a first lead screw; a first nut is arranged on the first lead screw, and is connected with the friction block; the friction block on the brake clamp body and a friction block on a first nut are positioned on two sides of the brake disc; the regeneration motor part includes an electromagnetic clutch, a regeneration motor, a battery set and an electronic control unit; the battery set is electrically connected with the stepper motor; and the electronic control unit controls connection and disconnection of current between the battery set and the stepper motor. The mechanism converts brake energy to electric energy as brake power, and can share brake loads.

The invention discloses a high temperature-resistant heavy-duty vehicle brake disc. The high temperature-resistant heavy-duty vehicle brake disc comprises a steel sheet and a friction base material pasted on the steel sheet, raw materials of the friction base material comprise phenolic resin, hydroxyl-terminated liquid polybutadiene rubber, acrylate rubber, silicone rubber, composite modified graphite, meerschaum fibers, potassium titanate whiskers, carbon fibers, aluminum fibers, silicon carbide fibers, molybdenum fibers, talcum powder, zirconium silicide, aluminum carbide, barium sulfate, zinc stannate, octaphenyl silsesquioxane and zirconium boride; and the composite modified graphite is prepared through the following steps: adding phenolic resin, a silane coupling agent KH-550, natural graphite oxide, nano-silica, nanometer titanium dioxide, nano-alumina, ethyl orthosilicate and phenyltriethoxysilane to ethanol, uniformly mixing above added materials and ethanol, stirring the added materials and ethanol at normal temperature for 2-4 h, heating the obtained mixture to 65-75 DEG C, stirring the heated mixture for 20-50 min, evaporating the stirred mixture, drying the evaporated mixture, carrying out dry crushing, and filtering the crushed mixture through a 300-350 mesh sieve.

The invention provides a whisker composite material for reinforcing automobile brake friction and a method for producing the same, wherein the composite friction material consists of basic magneislum whisker, pyrophyllite power, phenol resin, copper powder, graphite powder, aluminium oxide and zine stearate, as raw materials; the producing method comprises raw material pretreatment, raw material mixing, hot press molding and cooling. The invention achieves the phenol resin reinforcement by the basic magneislum whisker [MgSO4.5MgO.8H2O] with excellent low cost, selects the pyrophyllite [Al4Si8O20OH4] as the filler for the assorted fiber brake friction material, the concerted coupling function of a substrate, the whister and the filler can be exerted according to the addition of a friction reinforcing agent, and an antiwear agent, thereby the novel automobile brake composite material has advantages of good heat resistance, moderate coefficient of friction, small wear rate, well heat fade resistance, good brake effect and low cost.

The invention discloses a vehicle wheel rim composite brake device integrating permanent magnet braking and friction braking, and belongs to the field of vehicle braking. A support base ring is coaxially sleeved with an integrated brake disc, the support base ring is coaxially and fixedly sleeved with a magnetic circuit guide frame, a plurality of magnetic conductive pole pieces are evenly embedded in the side wall of the magnetic circuit guide frame in the circumferential direction, the support base ring is sleeved with a movable magnet support through a bearing, the support base ring is fixedly sleeved with a fixed magnet support, a plurality of movable magnets are evenly and fixedly connected to the outer wall of the movable magnet support in the circumferential direction, a plurality of fixed magnets are evenly and fixedly connected to the outer wall of the fixed magnet support in the circumferential direction, the movable magnets and one fixed magnet are arranged left and right inthe axial direction, the fixed magnets and the movable magnets which are opposite in the axial direction at the initial position are opposite in magnetizing direction, the movable magnets are rotatedto enable each movable magnet and the corresponding fixed magnet opposite to the movable magnet in the axial direction to be the same in magnetizing direction during permanent magnet braking, brakingenergy is shared through non-contact permanent magnet braking, and friction braking abrasion is reduced.

The invention discloses a ceramic-like friction material and a preparation method thereof, and is used for solving the technical problem that the friction material prepared by the traditional method is poor in heat resistance. The technical scheme is as follows: in the components of the friction material, powdery silicate inorganic binder replaces the organic binder in the prior art to prepare the ceramic-like high-temperature-resistant friction material, so that the heat fading resistance of the friction material is improved. The preparation method of the ceramic-like friction material adopts a preparing process of organically synthesizing the friction material, the friction material with ceramic characteristics is prepared by dry-process mixing and low-temperature treatment, and by test with a constant speed testing machine, the result shows that the friction factor does not attenuate at 400 DEG C.

An automobile brake lining is prepared from, by weight, 14%-18% of ceramic fibers, 3%-6% of carbon fibers, 3%-7% of cellulose fibers, 8%-13% of aramid fibers, 8%-13% of modified phenolic resin, 2%-4% of aluminium oxide, 3%-5% of barium sulphide, 6%-9% of graphite, 4%-6% of zirconite, 8%-12% of quartz sand, 1%-2% of bauxite, 1%-2% of zinc oxide, 2%-4% of chemigum, 1%-4% of antimony sulfide, 7%-10% of friction powder and 6%-9% of nanometer silicon carbide. According to the automobile brake lining, a ceramic brake pad is kept to be stable in braking, low in noise and the like, the mechanical strength of the brake lining is further improved, and the service life of the brake lining is prolonged; meanwhile, recession and expansion of the high temperature can be avoided, and the automobile brake lining has the advantages of being good in braking performance and abrasion resistance, stable in braking, less in dust, moderate in hardness and good in high temperature recovery performance.

The invention discloses a roof steering follow-up air resistance retarder comprising a control system, a fixed support and at least one sub-retarder. Each sub-retarder comprises a wind resisting blade, a steering follow-up mechanism, a transmission mechanism and a locking mechanism, wherein the steering follow-up mechanism is used for driving the wind resisting blade to perpendicularly rotate in relation to a car roof and mounted on the fixed support, the transmission mechanism is used for driving the wind resisting blade to horizontally swing in relation to the car roof and mounted on the steering follow-up mechanism, the transmission mechanism comprises rotating shafts and a motor, the rotating shafts are rotatably supported on the steering follow-up mechanism, the motor is movably connected with the rotating shafts, one wind resisting blade is fixedly connected to each rotating shaft, the locking mechanism disposed on the rotating shafts is used for limiting the swing angles of the rotating shafts which horizontally swing in relation to the car roof. The roof steering follow-up air resistance retarder has the advantages that the roof steering follow-up air resistance retarder has the steering follow-up function, a car is retarded by means of air resistance, thermal load of a frictional brake during vehicle continuous braking and continuous downhill running is distributed effectively, heat fading is prevented, vehicle driving safety is improved, and wear of the frictional brake is reduced.

The invention provides a resin-based friction material, which comprises the following components in percent by mass: 10 to 40 percent of mullite, 10 to 30 percent of phenolic resin, 10 to 30 percent of butadiene rubber, 10 to 30 percent of barium sulfate, 5 to 20 percent of feldspar powder, 1 to 10 percent of carbon black and 0.1 to 5 percent of zinc stearate, wherein the sum of the percent content of each component of the resin-based friction material is 100 percent. In the resin-based friction material, the mullite is taken as a component material of the friction material, and the high specific heat of the mullite is utilized to improve the thermal stability of the resin-based friction material, so that the heat fading resistance of an organic group friction material is greatly improved.

A metallurgical friction material for high-speed train brake pads in alpine regions of the present invention relates to the field of powder metallurgy materials and is composed of the following components in parts by weight: 30-70 parts of copper, 10-30 parts of iron, 5-30 parts of graphite 20 parts, 1-20 parts of zirconia, 1-10 parts of molybdenum disulfide, 3-5 parts of silicon carbide, 1-5 parts of tin, 1-5 parts of manganese, 1-5 parts of nickel, 0.5-5 parts of ferrochromium, 1.5-3.5 parts of aluminosilicate ore powder. A metallurgical friction material for brake pads of high-speed trains in alpine regions according to the present invention is suitable for making brake pads for high-speed trains in high-cold regions. Compared with the existing metallurgical friction materials, silicon carbide and mullite are added. These two ingredients improve the product's ability to resist heat fading, avoiding the possible heat fading phenomenon of brake pads in alpine regions, and greatly ensuring the safety of high-speed trains in alpine regions. At the same time, they can obtain good physical and mechanical properties and stability. friction and wear performance.

The invention relates to the technical field of brake materials, in particular to a friction material, an organic carbon ceramic brake pad prepared from the friction material and used for an abrasion-resistant coating braking disc, and a preparation method and application of the organic carbon ceramic brake pad. The friction material is prepared from the following raw materials in parts by weight:3-5 parts of carbon fibers, 10-15 parts of steel fibers, 5-10 parts of mineral fibers, 8-12 parts of modified phenolic resin, 5-10 parts of powdered nitrile rubber, 6-10 parts of cashew nut oil frictional powder, 10-20 parts of precipitated barium sulfate, 1-3 parts of acrylic fibers, 2-4 parts of silicon carbide, 5-10 parts of soft kaolin and 9-12 parts of zirconium silicate. The preparation method of the organic carbon ceramic brake pad comprises the steps of pressing, solidifying and forming. The organic carbon ceramic brake pad for the abrasion-resistant coating braking disc is stable instructure, good in heat resistance and friction performance, simple in preparation process and short in preparation period, the matching property between the organic carbon ceramic brake pad and the abrasion-resistant coating braking disc is good, an abrasion-resistant friction pair is made of the organic carbon ceramic brake pad and the abrasion-resistant coating braking disc, and the service life of the braking disc of an automobile, or a new energy vehicle or a bullet train can be effectively prolonged.

The invention discloses an active adjustment type air resistance retarding device on a car roof. The active adjustment type air resistance retarding device comprises a fixed support, a hydraulic oil way, at least one retarding secondary device and a control system. The retarding secondary devices comprise servo motors, hydraulic servo valves, air resistant blades and rotating shafts. The rotating shafts are supported on the fixed support through fixing assemblies in a rotating mode. The air resistant blades are fixedly connected to the rotating shafts. Input shafts of the hydraulic servo valves are connected with the servo motors, and output shafts of the hydraulic servo valves are connected with the rotating shafts. The control system comprises a speed sensor, a switch knob, blade position sensors and a controller used for controlling the servo motors and the hydraulic oil way to work, wherein the blade position sensors are arranged on the rotating shafts. According to the active adjustment type air resistance retarding device, the windward area of a car can be increased through automatic adjusting of angles or direct adjusting of the angles, retardant braking of the car can be achieved by means of air resistance, and the active adjustment type air resistance retarding device can convert weak signals into big hydraulic power to carry out adjustment, and is high in sensitivity and good in speedability.

The invention relates to application of a bismuth oxychloride/sulphur/potassium titanate compound ingredient to a phenolic-resin-based friction material. The compound ingredient is obtained through pelleting; the content of the compound ingredient in the phenolic-resin-based friction material is 5-40wt%; and the compound ingredient is capable of increasing the stability of the friction coefficient, reducing the wear rate and replacing poisonous and harmful sulfides.

The invention provides a running brake system and a vehicle. A rear brake loop in the running brake system comprises a second cavity of a mater pump assembly, a central brake assembly, a left differential lock assembly and a right differential lock assembly. When a pedal plate of a brake pedal plate assembly is treaded, the left differential lock assembly and the right differential lock assembly enable a rear axle differential mechanism to lose the differential effect under the hydraulic effect. The running brake system solves the problems that an existing running brake system is poor in heat-fading resistance and reliability, the phenomenon that when the vehicle is braked, due to affected by poor part consistency, large differences exist in brake torque of a left wheel and a right wheel of a rear axle is avoided, and the brake stability is improved.