92results about How to "Meet braking requirements" patented technology

The invention provides a copper-based powder metallurgy friction material for high-speed train braking. The copper-based powder metallurgy friction material comprises, by weight percentage, 40%-60% of copper, 7%-20% of iron, 3%-5% of chromium, 5%-10% of zirconite, 3%-6% of aluminum oxide, 2%-5% of tin, 2%-4% of manganese, 5%-10% of graphite, 2%-5% of molybdenum disulfide and 1%-5% of ferrochromium. A preparation method of the copper-based powder metallurgy friction material comprises the steps of proportioning, mixing, pressing, sintering and the like. The copper-based powder metallurgy friction material has excellent friction performance and stable and safe braking performance, and can meet the braking requirement of a 380 km/h high-speed train. The preparation method is simple and environmentally friendly, and has a good market prospect.

The embodiment of the invention provides a preparation method of a powder metallurgy material for a train brake pad. The powder metallurgy material comprises the following components by weight percent: 40-50% of copper powder, 10-25% of iron powder, 8-15% of ferro-manganese ore powder, 2-7% of silica, 5-9% of molybdenum disulfide, 2-8% of aluminum oxide, 1-5% of boron nitride, 15-25% of graphite and 0.2-1% of polyacrylonitrile fiber. In the preparation method, the components are evenly mixed by a high speed stirrer and then pressed into a biscuit; and the biscuit is fixed on a support steel back, and the required powder metallurgy material is obtained by a high temperature sintering technology. The powder metallurgy material obtained by implementation of the technical scheme has the advantages of over 125 MPa of compressive strength, excellent friction stability and heat resistance, thus the compressive strength and braking performance of the brake pad can meet the braking requirements of a high-speed train with a speed of 300km/h or beyond.

The invention discloses a brake energy feedback control system of a pure electric automobile. The system in the invention combines electric brake and mechanical brake, wherein the electric brake is realized by controlling a motor to work in a generating state; and the mechanical brake is realized by an electronic brake system. An entire automobile control unit is a core control unit of the brake energy feedback control system; and the entire automobile control unit is used for calculating brake torque needed by the motor and the brake force needed by the electronic brake system, and respectively transmitting control commands to a motor controller control circuit and the electronic brake system. The brake energy feedback control system in the invention not only meets the brake requirements of the automobile under various work conditions, but also ensures the stability of the automobile during driving and the smoothness of automobile brake speed reduction; and furthermore, the system is capable of effectively recovering the brake energy and improving the use efficiency of the entire automobile energy.

The invention discloses a brake energy feedback control method of a pure electric automobile. The method comprises the following steps of: judging whether a brake signal exists, if so, judging whether an ABS (antilock braking system) works, and if the ABS works, enabling a brake force Fm of a motor to be 0, enabling the front axle brake force Ff and the rear axle brake force Fb to be controlled by the ABS; if the ABS dose not work, adjusting based on the fact whether the maximum brake force Fmax provided by the motor currently meets the brake threshold value F, the sliding rate threshold value S of the front axle wheels and other factors required by a driver; if no brake signal exits, judging whether the automobile is in a sliding state, if so, judging whether a current speed V is greater than the sliding speed threshold value V0, if V is greater than V0, controlling the motor to provide the brake force Fh needed by over-speed sliding of the automobile, and if V is less than or equal to V0, requiring no braking for the automobile; and repeating the steps till the driver steps on an acceleration pedal or the automobile stops moving, ending the brake. By the method in the invention, the use efficiency of the entire automobile energy can be increased.

The invention relates to a carbon ceramic braking pad for a high-speed train and a preparation method of the carbon ceramic braking pad. The carbon ceramic braking pad is made of carbon ceramic composite material; the carbon ceramic composite material comprises the following components in percentage by mass: 16-30 percent of carbon fibers, 20-36 percent of pyrolytic carbon, 28-46 percent of silicon carbide, 6-12 percent of molybdenum disilicide and 2-6 percent of simple substance silicon; the density of the carbon ceramic composite material is 1.8-2.4g/cm<3>; the carbon fibers are uniformly distributed in the carbon ceramic composite material in a three-dimensional network structure. According to the invention, after the high-temperature heat treatment is performed on a carbon fiber felt with the density of 0.20-0.65g/cm<3>, the pyrolytic carbon is generated in the carbon fiber felt through the thermal-gradient chemical vapor deposition carburizing treatment, then the catalytic graphitization treatment, non-immersion type melting infiltration and assembly are performed, so that the carbon ceramic braking pad for the high-speed train is obtained.The carbon ceramic braking pad is simple in preparation technology, moderate in friction coefficient, good in abrasion performance, stable in braking and strong in environmental suitability and can meet braking requirements of the high-speed train with the speed of 200Km/h.

A hydraulic double-motor driving electronic hydraulic braking system comprises a braking pedal, a braking master cylinder, a secondary master cylinder, a liquid storage tank, a pedal displacement sensor, a hydraulic pressure sensor, an electronic control unit ECU, a first electronic control linear moving module and a second electronic control linear moving module for performing active control on hydraulic braking force and pedal force of the system, an electronic stability control module ESC for regulating the hydraulic braking force of each wheel cylinder, a tee joint for connecting hydraulic pipelines between the braking master cylinder and the inlet of the electronic stability control (ESC) module as well as between the secondary master cylinder and the inlet of the ESC module. According to the invention, the pedal force of a driver can be utilized for pressure establishing, the active control on the pedal force is realized while a pedal force simulator with a complex structure is omitted, braking pedal feel is ensured, the braking intention of the driver can be correctly reflected, the active control on hydraulic pressure is realized, the braking requirement of a vehicle is met, maximum braking energy recycling can be realized, the control is precise, and the response speed is high.

The invention relates to a copper-base powder metallurgy brake pad which is composed of copper, graphite, sea sand, ferrochromium, tin and ferrosilicon. The preparation technique comprises the following steps: weighing the powder components according to the proportion, incorporating zinc stearate and aviation kerosene, and evenly mixing; pressing into a pressed compact; and putting the pressed compact on a steel backing of which the surface is plated with copper, covering a graphite plate on the surface of the pressed compact, pressure-sintering in a sintering furnace in a gradient-temperature gradient-pressure mode, cooling in a water-cooling hood to room temperature, and discharging to obtain the copper-base powder metallurgy brake pad blank. The invention has the advantages of reasonable component proportioning, convenient manufacture, favorable wearability and long service life; the service life and braking performance of the brake pad can meet the braking requirements for a high speed shaft in the wind turbine generator set of which the power is greater than 2.5 MW; and the brake pad can be industrially produced, and has wide industrialization prospects.

A superimposed braking driver of a normally closed type brake comprises a driver (1), the external end of a push rod (7) is used for connecting a driving arm (8) in a braking part by hinge shaft so as to act on the braking part (9), a superimposed braking mechanism which can lead the braking part to realize superimposed braking is arranged, and the superimposed braking mechanism acts on the braking arm (10) in the braking part (9) by a corresponding component; the superimposed braking mechanism can adopt a plurality of structures like a superimposed braking mechanism (11a) or a superimposed braking mechanism (11b) or a superimposed braking mechanism (11c). By operating the driver (1) individually, the openness and restoration of the normally closed brake can be realized, and according to requirement, the superimposed braking mechanism can be operated individually to realize the superimposed brake; and the working process of the openness and restoration of the normally closed brake can be applied to a working condition with frequent braking individually to lead the normally closed brake and the superimposed brake to be in a working process of a braking mode, and can be applied to a more stable and reliable braking.

The invention discloses a powder metallurgy brake lining fora high speed train and a preparing method thereof, belonging to the technical field of a brake. The preparing method comprises the steps of raw material treating, burdening, mixing, compression moulding, molding and sintering, machining, rivet processing and so on. The power is prepared from, by weight, 50-70 parts of copper powder, 3-10 parts of iron powder, 10-20 parts of graphite, 5-10 parts of silicon carbide, 2-6 parts of quartz sand, 0.5-3 parts of nickel powder, 1-7 parts of tungsten carbide, 0.5-2 parts of molybdenum oxide, 1-4 parts of zirconite, 2-6 parts of tin powder and 0.5-2 parts of boron nitride. The technical scheme takes the copper as the base component; the base is reinforced by adding iron powder, nickel powder, tin powder and the like; the friction coefficient of the car brake block is increased by adding silicon carbide, zirconite, quartz sand and the like, and the brake pad with stable brake, log service life and capability of meeting the brake requirement of the high-speed train.

The invention discloses a planetary gear series-parallel twin-mode hybrid vehicle drive system and relates to the technical field of vehicles. The system comprises an engine, a front planetary gear train, a rear planetary gear train, a first clutch, a second clutch, an overrun clutch, a backstop, a brake, a first motor and a second motor. Conversion among different working modes can be achieved through combination and separation of the clutches and the brake. The system is compact in structural design, the power grades of the motors are effectively decreased, the sizes of the motors are reduced, the slope climbing performance of the vehicle in a pure electric mode is improved, and the low-speed performance of the vehicle in the pure electric mode is improved; the defect that parasitic power is generated when the vehicle travels in a high-speed area is overcome, the high-efficiency range of a hybrid power system is enlarged, and the economic efficiency of the vehicle is improved; and the problems that the acceleration performance of the vehicle is poor and the slope climbing capability is limited in a low-speed area are solved, and the dynamic property and the economic efficiency of the vehicle are improved.

The invention discloses a vehicle electronic mechanical brake actuator. The vehicle electronic mechanical brake actuator comprises the structure that a motor shell is connected with a harmonic gear reducer rigid gear and a bracket through fastening screws; the bracket is fixedly connected with a brake caliper body through a locking nut; power of a motor is transmitted to a harmonic gear reducer through a motor shaft; flexible wheel gears at the two ends of a long shaft are inserted into harmonic gear reducer rigid gear grooves; a flexible gear is connected with a screw nut of a ball screw through a fastening screw to transmit torque; a groove is formed in the screw nut; a bump on the bracket is embedded into the groove and is in clearance fit with the groove; a guide key is arranged between the ball screw and the bracket; the bracket is contacted with the left end of the ball screw; the ball screw is sequentially connected with a linear pushing block, a brake friction block and a brake disc; a brake friction sheet is arranged in a clamping groove of the brake caliper body; a brake disc is fixed to a wheel hub; the linear pushing block is arranged in a cavity of the brake caliper body. The vehicle electronic mechanical brake actuator is simple and compact in structure and good in brake performance.

The invention relates to the technical field of engineering machinery, and discloses a lithium battery system and an overhead working truck. The lithium battery system comprises a battery and a feedback current control device, wherein the feedback current control device comprises a plurality of current capture module groups, each module group comprises a heating module matched with the position ofa battery module and used for capturing feedback current, a first switch module used for conducting a current capture branch where the switch module is located, and a control module used for receiving a first voltage and a second voltage on a main circuit and the average temperature of the battery, controlling the first switch module in each current capture module group to switch on the current capture branch in which the first switch module is located when the difference between the first voltage and the second voltage is greater than a preset voltage and the average temperature of the battery is less than or equal to a preset temperature, and converting the feedback current into heat energy by the heating module to heat the corresponding module. According to the invention, the probability of lithium precipitation of the battery and the risk of thermal runaway of the battery can be greatly reduced.

The invention discloses a silane coupling agent modified artificial graphite resin-based brake pad and a manufacturing method of the silane coupling agent modified artificial graphite resin-based brake pad. Materials comprise phenolic resin, rubber and organic friction powder, short cut steel fibers, red copper fibers, aramid fibers, high-aluminum ceramic fibers, mineral fibers, silane coupling agents, graphite, composite fillers and the like. The manufacturing method of the silane coupling agent modified artificial graphite resin-based brake pad includes the steps that the silane coupling agents are used for modifying the artificial graphite first, the materials are weighed in sequence and added into a high-speed mixer to be uniformly mixed, pressing and heat curing treatment are conducted according to the dry method one-shot forming method for traditional resin-based friction materials, and finally machining, ceramic treatment and inspecting packaging are carried out. The silane coupling agent modified artificial graphite resin-based brake pad manufactured according to the method has the advantages of being large in braking torque, comfortable and stable in emergency braking, free of obvious degeneration and noise and less in dust fall. The production method is simple and environmentally friendly. The silane coupling agent modified artificial graphite resin-based brake pad is especially suitable for urban bus air disk brakes and has broad market prospects.

An automatic braking device of a gardening tool comprises a fixing plate, wherein a motor and an output shaft are arranged on the fixing plate. A big belt wheel is fixed on the output shaft. The lower end of a shaft of the motor stretches out of the fixing plate and a small belt wheel is fixed on the lower end of the shaft of the motor. The big belt wheel is connected with the small belt wheel in a transmission mode through a transmission belt. A friction ring sleeved on the output shaft and stretching into the big belt wheel is fixed on the fixing plate. A spring and a braking block are arranged in an inner cavity of the big belt wheel. One end of the braking block is movably connected with the big belt wheel. The other end of the braking block is matched with the spring in an abutting mode. A check slope is further arranged in the inner cavity of the big belt wheel. A protrusion is arranged on the braking block and is capable of sliding on the check slope. The automatic braking device of the gardening tool has the advantages of being simple in structure, high in safety, good in braking effect, low in production cost, long in service life, stable and reliable in working, and the like.

The invention relates to a roller type mechanical brake belonging to the field of mechanical brakes and provided with a roller type overrunning clutch mechanism having a star wheel as an outer star wheel. The roller type mechanical brake is characterized in that a spring lifting pin mechanism installed on the outer star wheel (11) in the roller type overrunning clutch mechanism having the star wheel as the outer star wheel is removed and is replaced by a cylindrical roller lifting post (9) installed nearby the original spring lifting pin mechanism, wherein the cylindrical roller lifting post (9) can do constrained motion along the radial direction of the outer star wheel (11), lift a roller (2) in the mechanism on a working position under the action of operational external force and be separated from the roller (2) under the action of the operational external force.

The invention relates to a railway locomotive synthetic brake shoe preparation technique, particularly a brake shoe body preparation material which is prepared from the following components in parts by weight: 9-10 parts of nitrile-butadiene rubber, 4-5 parts of phenol aldehyde resin, 8-10 parts of meerschaum, 21-23 parts of iron powder, 3-4 parts of steel wool fiber, 0.3-0.8 part of bauxite, 11.5-12.5 parts of composition fiber, 15-17 parts of barium sulfate, 14-15.5 parts of graphite, 5-6 parts of potash feldspar, 0.2-0.7 part of accelerator, 0.1-0.5 part of zinc oxide, 0.1-0.5 part of stearic acid and 0.5-1 part of sulfur. The invention develops the friction material for Chinese railway HXD2 locomotives and forms the manufacturing technique of the friction material for Chinese CRH locomotives. The novel brake shoe can substitute imported products to satisfy the braking requirements of Chinese railway high-power locomotives.

The invention discloses a main shaft brake lining of a wind-driven generator. The brake lining is composed of, by weight, electrolytic copper powder of 55-65%, atomization tin powder of 1-8%, reduced iron powder of 5-15%, flake graphite of 5-12%, granular graphite of 5-10%, aluminum hydroxide of 5-15% and chromium powder of 8-15%. The invention further discloses a preparation method of the main shaft brake lining of the wind-driven generator. The brake lining is obtained through the steps of material proportioning, material mixing, cold blank compression forming, high temperature sintering in an elevator furnace, furnace cooling and final machining. The brake lining manufactured through the method is stable in friction coefficient, high in wear resistance, free of sparks in braking, long in service life and small in wear to mating plates, and can fully meet the braking requirement of a main shaft of the wind-driven generator.

The invention discloses a light weight wear-resistant aluminum-based powder metallurgy composite material rail traffic brake disc and a preparation method thereof. The rail traffic brake disc is prepared from an aluminum-based powder metallurgy composite material through cold press molding, sintering and integrated hot pressing shaping processes. The prepared rail traffic brake disc has a series of advantages of no damage, no defect, good compactness, high strength and the like, and can meet braking and wear-resisting demands of the rail traffic brake disc well. Meanwhile, compared with a conventional cast iron brake disc, the weight is reduced by 40-60%, so that energy consumption is saved greatly, and the demand on energy conservation and emission reduction in China is met. The rail traffic brake disc is simple in preparation method, low in cost and high in rate of finished products. The preparation method can be used for preparing rail traffic brake discs of various dimensions and structures, and meet the industrial continuous production demand on a large scale.

The invention discloses a carbon-ceramic brake disc with a wear-resistant and anti-oxidation coating and a preparation method of the carbon-ceramic brake disc. The preparation method comprises the following steps that grooving treatment is conducted on the upper surface and the lower surface of a carbon/carbon composite material disc body, then coating slurry is brushed in a groove in the upper surface till the groove in the upper surface is filled with the coating slurry, and then the carbon/carbon composite material disc body is turned over, the groove in the lower surface is coated with the coating slurry till the groove in the lower surface is filled with the coating slurry, thus the carbon/carbon composite material disc body containing the coating slurry is obtained, curing, carbonization and ceramization treatment are sequentially conducted, and the carbon-ceramic brake disc is obtained. The preparation process of the wear-resistant and oxidation-resistant coating is simple, large-scale industrial mass production is easy to realize, the coating is bright and smooth in appearance, the bonding strength between the coating and the disc body is high, the size precision is easy to accurately control, and the problem that the size is easy to control inaccurately when the ceramic brake disc is subjected to machining treatment can be effectively solved.

The invention relates to a braking energy feedback system of a full electric vehicle based on data redundancy dual controllers. The system comprises a vehicle controller as well as an energy management system, an energy storage system and a data redundancy system which are controlled by the vehicle controller, wherein the data redundancy system consists of an ABS (Anti-skid Brake System) controller and a motor controller which are connected with each other through a data interaction channel CAN (Controller Area Network) bus, and are simultaneously connected with the vehicle controller through the CAN bus. Regenerated braking force and frictional braking force in a braking process are operated by the ABS controller and the motor controller, and data interaction and optimization between the two controllers is carried out to increase the speed, so that data is prevented from being transmitted from the vehicle controller to the brake controller and the ABS controller, therefore, the deficiency that the best opportunity of brake is always missing caused by too low response speed in a conventional braking process is overcome, the braking energy recycling effect is improved and the response speed and the driving range of the full electric vehicle are increased.

The invention relates to a brake shoe external arc surface accuracy measuring instrument for automobile brakes. The brake shoe external arc surface accuracy measuring instrument comprises a base body part, a measuring mechanism and a workpiece positioning mechanism; three support pins, distributed along the inner edge of the arc periphery of an upright plate of the base body part, are arranged on the upright plate of the base body part; the sliding seat bushing of the measuring mechanism sleeves a guide rod; a sliding seat sleeves the sliding seat bushing; the sliding seat is sleeved with a meter stand; the meter stand is provided with a dial indicator; the dial indicator can synchronously rotate or move axially with the sliding seat; an axial positioning sleeve sleeves the guide rod; the guide rod is mounted on a guide rod tail seat and a guide rod front seat; the positioning rod supporting seats of the workpiece positioning mechanism are provided with workpiece positioning rods; and a bottom plate is provided with a sliding seat limiting rod which limits the axial movement of the sliding seat when the sliding seat rotates, and limits the rotation of the sliding seat when the sliding seat axially slides. With the brake shoe external arc surface accuracy measuring instrument adopted, the use condition of a brake shoe on an automobile can be simulated; and the circularity of the outer arc surface of a brake shoe panel (M) and the axial straightness of the brake shoe panel (M) can be measured conveniently and accurately.

The invention provides a synthetic friction material and a preparation method and application thereof. The synthetic friction material comprises the following components in percentage by mass: 8-10% of nitrile rubber, 0.9-3% of sulfur, 5-7% of boron modified phenolic resin, 10-14% of crystalline flake graphite, 8-10% of bauxite, 8-10% of wollastonite, 3-5% of diatomite, 6-7% of reduced iron powder, 12-15% of precipitated barium sulphate, 5-7% of pineapple leaf fibers, 6-8% of steel fibers, 2-4% of a coupling agent combination agent and 7-10% of inorganic mineral fibers. The sum of the mass percentages of all the components is 100%. The coupling agent combination agent comprises a silane coupling agent and an aluminate coupling agent. The invention further provides application of the synthetic friction material in synthetic friction materials for urban rail vehicles. The synthetic friction material provided by the invention has the advantages of environmental protection, high mechanical strength, low compression modulus, small dual wear, low abrasion and the like.