215results about How to "Improved braking stability" patented technology

The invention relates to a carbon-ceramic composite brake disc and a preparation method thereof and belongs to the technical field of preparation of carbon-ceramic composites and brake discs. The carbon-ceramic composite brake disc comprises the following components by mass percent: 12% to 20% of short carbon fiber, 20% to 45% of matrix carbon, 30% to 55% of SiC and 2% to 6% of Si, wherein the short carbon fiber is 15-30mm in length. The method comprises the following steps: carbonizing a carbon fiber-reinforced blank body with the density of 0.9g/cm<3> to 1.3g/cm<3> so as to obtain a porous carbon/carbon (C/C) body; then performing dipping on the porous C/C body, cross-linking solidification and splitting decomposition so as to generate a SiC base body on the matrix carbon; performing the dipping, the cross-linking solidification and the splitting decomposition again until the density of an obtained C/C-SiC composite blank body reaches 1.6-1.9g/cm<3>; and performing silicon leaching treatment on the C/C-SiC composite blank body and anti-oxidation treatment and assembling, thus obtaining the carbon-ceramic composite brake disc. According to the method provided by the invention, the difficult problem that a metal brake disc is poor in thermal dissipation and abrasion resistance and heavy in weight in the prior art is effectively solved. The preparation method is simple; and the obtained carbon-ceramic composite brake disc is high in thermal stability, light in weight and resistant to abrasion, and cannot generate thermal vibration.

The invention discloses a mine-hoist constant deceleration safety braking system and a braking method thereof, and relates to the technical field of mine-hoist safety braking control. The system comprises a disk brake, a hydraulic station, an electric control device and a detection feedback device which are arranged on a drum brake disk, wherein a speed sensor arranged on the drum acquires a hoist deceleration signal and inputs the hoist deceleration signal into the electric control device; the electric control device receives the signal and compares the signal with the given speed value to send out a control command; after the control command is processed into an electric signal and compared with an oil pressure signal which is fed back by a pressure sensor on the hydraulic pipeline arranged between the outlet end of an electrohydraulic proportion reversing valve and the disk brake cylinder, an electric signal control command is sent out; and the electrohydraulic proportion reversingvalve of the hydraulic station outputs a hydraulic pressure signal, which varies as the input control command varies, so as to control the motion state of the hoist by the disk brake, thereby realizing constant deceleration safety braking of the mine hoist.

The present invention is to provide a method of manufacturing a potassium titanate adapted for a friction material of a friction slide member. The present invention includes the steps of uniformly mixing an aggregate or a granulation of a titanium compound and a potassium compound with a vibration rod mill to form a mixture and sintering the mixture for reaction one another in order to manufacture a desired potassium titanate with ease and low cost.

The invention provides a vehicle and a vehicle slide energy recycling method and system. The method includes: acquiring required motor brake torque when a slide energy recycling condition is satisfied; acquiring a battery influence factor; acquiring a vehicle speed influence factor; acquiring maximum motor brake torque; acquiring actual motor brake torque, selecting the smaller one of the required motor brake torque and the maximum motor brake torque, and multiplying the smaller one by the battery influence factor and the vehicle speed influence factor to obtain the actual motor brake torque; driving a motor to operate for energy recycling according to the actual motor brake torque. The v vehicle and the vehicle slide energy recycling method and system have the advantages that overall vehicle mass and current road slope can be detected in real time to adjust the required motor brake torque, compatibility of road slope variation and vehicle mass variation during vehicle energy recycling is achieved, the method is widely applicable, brake stability is increased by adding the current vehicle speed influence factor, and vehicle slide energy recycling safety is increased by adding a fault influence factor.

The invention provides a self-locking electronic mechanical braking device. The braking device consists of a box, a first motor, a planet gear transmission mechanism, a lead screw shaft, a second motor, a ball screw pair nut, a spring, friction plates and a brake disc; the first motor is mounted on the box; a sun gear of the planet gear transmission mechanism is arranged on a motor output shaft; a gear ring is fixed in the box; a planet carrier is coaxially connected with the lead screw shaft; the muddle part of the lead screw shaft and a second motor rotor are mounted to form a slide lead screw pair; a second motor stator is fixedly mounted on the inner side of the box; the other end of the lead screw shaft and the ball screw pair nut are mounted to form a ball screw pair; the ball screw pair nut penetrates through the box; the spring is mounted between the ball screw pair nut and the box; two friction plates are respectively mounted on separation plates on the outer sides of the ball screw pair nut and the box; and the brake disc is mounted between the two friction plates. The braking device can effectively save the volume in overall vehicle arrangement, and can stably realize self-locking function.

A method for constructing rubber particles asphalt concrete road surfaces relates to a method for constructing asphalt concrete road surfaces, aiming to resolve the problems that: the asphalt concrete road surfaces have weak wear-resistant, and the attachment coefficient and the adhesive force are reduced and vehicles have the problem of braking stability when the road surfaces are covered by snow and ice. The construction method comprises the following steps that: compositions by weigh percentage of the following materials are adopted: 76.5 to 91.5 percent of mineral aggregate, 2.5 to 7.5 percent of asphalt, 4 to 10 percent of mineral powder and 2 to 6 percent of rubber particles; the mineral aggregate is heated up to 190 to 200 DEG C, the rubber particles are added into the mineral aggregate with mixing about 20 to 25 seconds, the asphalt heated up in advance and the mineral powder are added into the rubber particles and the mineral aggregate with mixing lasting for 70 to 80 seconds, and then the road surfaces are subject to the pavement, the first stage initial pressure, the first and the second stage re-pressure and the second stage final pressure. The invention can increase the deformation capabilities of the road surfaces effectively, improve the bond state between the road surfaces and snow, and the invention can improve the attachment coefficient, increase the adhesive force, and improve the braking and turning operation stability of vehicles when the road surfaces are cover by snow and ice.

The invention discloses a disc type brake-by-wire system based on magnetostrictive material and a control method thereof. The disc type brake-by-wire system comprises a brake pedal module, a left front brake, a right front brake, a left rear brake, a right rear brake, a left front wheel, a right front wheel, a left rear wheel, a right rear wheel, a control module, a power source, a current adjusting module and a parking brake module. According to the system, by means of the characteristics of a magnetostrictive material, the magnetostrictive material serves as a driving source and controls thebraking system by controlling the current in a magnet exciting coil. Due to the fact that traditional hydraulic drive is replaced by magnetostriction drive, the defects of an electric control hydraulic brake system are eliminated. Compared with a mechanical brake-by-wire system, the brake-by-wire system is simple in structure, light in weight, small in size, low in energy consumption and beneficial to control.

The present invention relates to automobile braking system technology, and discloses one kind of brake block of environment friendly composite material and its making process. The present invention features that the brake block is made with nanometer modified resin, composite mineral fiber, organic fiber, mineral fiber, ceramic fiber, artificial graphite, baritite and other materials in certain weight proportion, and through mixing, hot pressing and heat treatment. The brake block has the advantages of no pollution, good damping and noise reducing performance, low cost, long service life, high braking stability, etc.

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 wear-proof brake pad. The wear-proof brake pad comprises a steel plate, a thermal-insulating layer and a friction block. The friction block is fixed to the steel plate through the thermal-insulating layer. The raw materials of the friction block comprise, by weight, 10-20 parts of phenolic resin, 3-12 parts of nitrile rubber, 2-10 parts of butadiene rubber, 5-10 parts of carbon fiber, 3-8 parts of aramid fiber, 2-5 parts of glass fiber, 10-30 parts of potassium titanate lamella crystals, 5-20 parts of iron sodium titanate lamella crystals, 20-40 parts of barium sulfate, 2-5 parts of nano-silica, 2-5 parts of sepiolite, 2-8 parts of alumina powder, 0.2-1.5 parts of accelerant D, 0.1-0.5 part of zinc oxide, 1-4 parts of vermiculite powder, 2-5 parts of petroleum coke, 1-5 parts of synthetic graphite and 3-10 parts of bamboo charcoal. The wear-proof brake pad is excellent in wear resistance and impact resistance, good in heat resistance and small in curing shrinkage.

The invention provides a rail train brake control system and a rail train brake control method. Brake control units in each compartment are arranged for receiving train brake commands and respectivelycalculating the load, the electric brake maximum available value and the air brake maximum available value of the compartment, the load, the electric brake maximum available value and the air brake maximum available value of a traction unit in which the compartment is located, and the load, the electric brake maximum available value and the air brake maximum available value of the train, and finally performing calculating to obtain an electric brake force applying value and an air brake force applying value of the compartment. According to the control system and the control method disclosed by the invention, the unit electric brake maximum available value and the unit air brake maximum available value of the traction unit in which each compartment is located, and the train electric brakemaximum available value and the train air brake maximum available value of the rail train can be updated in real time according to the condition of the compartment, so that the technical problem thatin the prior art, the brake of the rail train fails caused by that a head train brake control unit or an end train brake control unit is broken down, the brake stability of the rail train brake control system is improved, and the travelling safety of the rail train is further improved.

The invention relates to a preparation method of a carbon fiber brake block, relating to the technical field of automobile brake systems. Aiming at the problems of thermal conductivity and high-temperature controllability existing in the current asbestos-free organism-type (NAO type) automobile brake block, the invention provides the preparation method of the carbon fiber brake block which is prepared from the following raw materials including the following components in percentage by weight: 35-55% of carbon fiber, 15-35% of phenolic resin and 20-40% of powdery packing. The prepared carbon fiber brake block has thermal conductivity and electrical conductivity as well as thermal resistance and corrosion resistance of a metal material; and as the rise of temperature, the friction coefficient is kept constant and even is slightly increased, therefore, the carbon fiber brake block has very excellent brake stability.

The invention discloses a detection and braking integrated robot joint driver and relates to the field of industrial control. The detection and braking integrated robot joint driver comprises a speedreducing assembly, a driving assembly, a braking assembly and an angle detection assembly, and a reducer input shaft in the speed reducing assembly penetrates through and integrates the driving assembly, the braking assembly and the angle detection assembly, so that a mechanical structure of the detection and braking integrated robot joint driver is compact and concise; the compact mechanical structure allows electrical design and configuration of the detection and braking integrated robot joint driver to be relatively simple; with the adoption of a speed reducer input shaft coaxial mounting manner, an angle sensor detects more precisely, braking force of a friction block is applied more directly and uniformly, the braking stability is better, and the reliability of the detection and braking integrated robot joint driver is improved integrally; through the use of an elastic component in the detection and braking integrated robot joint driver, an unavoidable error in use and assembly ofthe detection and braking integrated robot joint driver is compensated smartly, and the reliability of the detection and braking integrated robot joint driver is further perfected; in conclusion, themechanical structure assembly mode of the detection and braking integrated robot joint driver can be integrated, the electrical design is simplified and the integrated level and reliability are improved.

A braking pedal feel simulating device of an automobile brake-by-wire system comprises a braking pedal, a pedal controlling arm, a pedal shaft, a pedal fixing support, a torsion spring, a pedal angle displacement sensor, a pedal force sensor and a pedal feel simulator. The braking pedal is fixedly connected with the pedal controlling arm, a round hole is processed at the upper end of the pedal controlling arm which is rotatably connected with the pedal shaft, the pedal shaft is mounted in a mounting hole of the pedal fixing support, a guide small hole is formed in the pedal fixing support, the diameter of the guide small hole is in interference fit with the outer diameter of a pushing rod, the torsion spring is cylindrical and is sleeved on the pedal shaft in a hollow manner, one end of the torsion spring is fixedly connected on the pedal fixing support while the other end of the same is connected on the pedal controlling arm, the torsion spring reverses and generates spring force along with rotating of the pedal controlling arm, the pedal angle displacement sensor is mounted in the round hole at the upper end of the pedal controlling arm, the pedal force sensor is mounted on the braking pedal, and the front end of a pushing rod of the pedal feed simulator is rotatably connected with the pedal controlling arm.

A method for controlling braking force in a regenerative brake cooperation control system can maximally use regenerative braking force of a rear wheel simultaneously while improving vehicular braking stability by preventing the rear wheel from being locked earlier than a front wheel. The method includes controlling braking forces of the front wheel and the rear wheel by considering a distribution of total vehicular braking force including a coasting regenerative braking force in the regenerative brake cooperation control system in an eco-friendly vehicle which can perform regenerative braking in the rear wheel or both the front wheel and the rear wheel.

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The invention relates to an electric vehicle control method based on left and right electric wheel differential motion/braking control. A control system is used for judging a steering intention of a driver according to the steering direction of a steering wheel and then judging an acceleration or deceleration intention of a vehicle; as a mode of acceleration of the vehicle, voltages of a left motor and a right motor are distributed according to the requirements of steering angles, so that the rotating speeds of a left electric wheel and a right electric wheel reach the requirements of the steering angles; as another mode of deceleration of the vehicle, braking forces applied to the left electric wheel and the right electric wheel are distributed according to the requirements of the steering angles; in the process of distributing the braking forces, in accordance with the difference of the braking strengths, different braking modes are adopted, i.e., magnetic fields of the motors are independently used for braking, the magnetic fields of the motors and a hydraulic braking system are jointly used for braking, and the hydraulic braking system is independently used for braking. The electric vehicle control method disclosed by the invention has the characteristics of protecting braking pieces, reducing power consumption, acquiring energy recovery, ensuring that the vehicle stably operates, saving energy, protecting environment, reducing cost and the like, and is convenient to operate.

The invention belongs to the field of vehicle brake, and particularly relates to an electric commercial vehicle brake energy recovery system and a control method. The system comprises a control systemand a pneumatic brake system, the control system comprises a brake controller, a brake bridge valve controller, a motor controller and a motor, and the pneumatic brake system comprises a brake pedal,a high-pressure air storage barrel, a front brake axle valve, a rear brake axle valve, a front wheel brake cylinder and a rear wheel brake cylinder; the brake controller comprises a communication module and a brake force distribution module, the brake bridge valve controller comprises a pressure acquisition module, a control module and a driving module, and the air brake bridge valve comprises anair pressure combination valve, a left brake air path and a right brake air path. The method comprises the steps of obtaining the current vehicle information through a vehicle-mounted CAN bus and a vehicle-mounted sensor; judging the participation condition of a brake source in the current scene; and the brake controller formulating a brake strategy according to the vehicle state and the brake pedal information. According to the scheme provided by the invention, the coordination control method of the air pressure brake and the electric brake of the electric vehicle under the conventional brake working condition is comprehensively considered, so that the brake force distribution is more reasonable.

A motorcycle tire for running on rough terrain is provided, the rotation direction of the motorcycle tire is specified, and the motorcycle tire can maintain traction force and improve brake stability. At least one of pattern blocks comprises a first pattern block, the first pattern block comprises a tread portion, a first ground-touching side wall surface extending from a front edge of the tread portion toward the internal side, and a back ground-touching sidewall surface extending from a back edge toward the internal side. The first ground-touching side wall surface of the pattern block is formed by a steeply inclined surface inclining toward the first ground-touching side. The back ground-touching sidewall surface comprises: a front end side region and a root side region connected with the front end side region and extending toward the internal side. The front end side region is formed by a gently inclined surface inclining toward the back ground-touching sidewall side. The root side region is provided with: a middle surface extending in the same angle with the front end side region; a pair of side part surfaces formed by steeply inclined surfaces disposed respectively at two sides of the pattern block width direction of the middle surface and inclining toward the back ground-touching side; and a step surface connecting the side part surfaces and the middle surface.

The invention discloses a power device for an air jet loom. The power device for the air jet loom comprises a servo motor, wherein a primary driving gear is arranged on the output shaft of the servo motor and is in mesh transmission with a beating-up transmission gear and an open transmission gear simultaneously, the open transmission gear is arranged on an open transmission gear shaft, a power-off brake is arranged on the open transmission gear shaft, the beating-up transmission gear is arranged on a transmission shaft, and a beating-up conjugate cam is arranged on the transmission shaft. By means of the gear transmission structure formed by the primary driving gear, the beating-up transmission gear and the open transmission gear, transmission efficiency is increased, the structure is simplified, and regulation and maintenance are convenient.