Showing papers on "Disc brake published in 2014"

Disc brake squeal noise generation: predicting its dependency on system parameters including damping

Abstract: The concept of the mechanism of disc brake squeal noise generation being a 'kinematic constraint' or 'geometricallv induced' instability is extended to include pad support and disc damping. A dynamic analysis is presented of a double–pin and disc system and the conditions for unstable oscillatory motion to occur are detailed. It has been shown previously that there is a good correlation between the occurrence of squeal noise and the predicted unstable states. Illustrations are given of the effects of varying, the system parameters, of having dissimilar pins reacting on the disc, and of including pin support and disc damping. From the wide range of possible system parameter combinations, producing many and varying effects on the size motion to occur is that one or bath of the pins has a negative (digging–in) angle of orientation to the disc surface within the range 0 < θ < tan–1μ; sufficient conditions depend on the magnitude of the system parameter. Stable motion may be obtained by using dissimilar pin orientations, having a large disc mass or high pin torsional stiffnesses. Increasing The disc damping has little effect on the area of the unstable region, but substantially reduces the instability magnitude. Varying the pin torsional damping reduces the unstable region, but has little effect on the instability magnitude.

Overview of Disc Brakes and Related Phenomena - A Review

Abstract: Disc brakes have evolved over time to be a reliable method of decelerating and stopping a vehicle. There have been different designs of disc brake systems for different applications. This review gives a detailed description of different geometries of the components and the materials used in a disc brake system. In spite of all the improvements, there are still many operational issues related to disc brakes that need to be understood in greater detail and resolved. There has been a lot of research going on about these issues and at the same time different methods are being proposed to eliminate or reduce them. There has also been intensive fundamental research going on about the evolution of the tribological interface of the disc-pad system. One major purpose of the present paper is to give a comprehensive overview of all such developments.

Disc brake for a commercial vehicle

Abstract: A disc brake for a commercial vehicle includes a brake caliper that straddles a brake disc, a brake application device, arranged in the brake caliper, for pressing brake pads against the brake disc Two parallel, spaced-apart adjusting spindles are mounted in a rotatable manner via a corresponding thread, in a bridge of the brake application device A wear adjusting device is arranged in the brake caliper and compensates for a wear-related change in the clearance between the brake pad and the brake disc by axially moving the adjusting spindles A synchronizing device includes a traction drive mechanism which allows the two adjusting spindles to be synchronously rotated The fraction drive mechanism has a traction mechanism that meshes in a force transmitting manner with drive gears which are effectively connected to the adjusting spindles for conjoint rotation therewith Each drive gear includes at least one form-fitting element which engages with an outer axial guide of the associated adjusting spindle

Design and Analysis of Disc Brake

Abstract: Each single system has been studied and developed in order to meet safety requirement. Instead of having air bag, good suspension systems, good handling and safe cornering, there is one most critical system in the vehicle which is brake systems. Without brake system in the vehicle will put a passenger in unsafe position. Therefore, it is must for all vehicles to have proper brake system. In this paper carbon ceramic matrix disc brake material use for calculating normal force, shear force and piston force. And also calculating the brake distance of disc brake. The standard disc brake two wheelers model using in Ansys and done the Thermal analysis and Modal analysis also calculate the deflection and Heat flux, Temperature of disc brake model. This is important to understand action force and friction force on the disc brake new material, how disc brake works more efficiently, which can help to reduce the accident that may happen in each day.

Electronic Disc Brake

Abstract: Disclosed is an electronic disc brake. The electronic disc brake includes a caliper housing at which a piston is installed, a carrier coupled with the caliper housing, a pair of pad plates installed at the carrier to be slidable toward a disc, an adjuster to prevent the pad plates from moving away from the disc and maintain the pad plates at a certain distance from the disc, a push rod screw-coupled to the adjuster, a spindle unit coupled to the push rod and installed at a cylinder of the caliper housing, a spring case forming an accommodation space between the cylinder and the push rod, a low-pressure spring and a high-pressure spring arranged in parallel in the spring case, and a support plate slidably installed in the cylinder so that a gap is formed between the low-pressure spring and the high-pressure spring in the longitudinal direction.

Structural and Thermal Analysis of Automotive Disc Brake Rotor

Abstract: The main purpose of this study is to analyze the thermomechanical behavior of the dry contact between the brake disc and pads during the braking phase. The simulation strategy is based on softawe ANSYS11. The modeling of transient temperature in the disc brake is actually used to identify the factor of geometric design of the disc to install the ventilation system in vehicles. The thermal-structural analysis is then used with coupling to determine the deformation established and the Von Mises stress in the disc, the contact pressure distribution in pads. The results are satisfactory compared to those of the specialized literature.

Bicycle brake caliper assembly

Abstract: A bicycle brake caliper assembly comprises a brake caliper and a base member. The brake caliper is configured to apply a braking force on a brake disc rotor configured to be rotatable about a rotational axis. The base member is configured to be coupled to the brake caliper and to be attached to a bicycle frame such that relative position between the rotational axis of the brake disc rotor and the brake caliper is adjustable in a radial direction of the brake disc rotor. The base member includes a first coupling portion at which the brake caliper is coupled, and a second coupling portion at which the brake caliper is coupled and which is arranged apart from the first coupling portion in the radial direction.

Ramp starting control method for pure electric vehicle

Abstract: The invention discloses a ramp starting control method for a pure electric vehicle. The ramp starting control method includes the following steps that (1), whether the pure electric vehicle is located on a ramp or not is judged according to a signal of a ramp sensor of the pure electric vehicle, speed of the vehicle is obtained, and whether the vehicle is in a parking state or not is judged according to the speed of the vehicle, the state of a pure electric vehicle electronic hand brake and the state of a pure electric vehicle brake pedal; (2), when the vehicle is in the parking state, whether a driver starts a ramp starting mode or not is judged according to the state changes of the pure electric vehicle electronic hand brake and the brake pedal; (3), when the vehicle is in the ramp starting mode, the pure electric vehicle calculates needed forward torque serving as target torque according to the signal of the pure electric vehicle ramp sensor and vehicle information; when actual torque of the vehicle reaches the target torque, the pure electric vehicle electronic hand brake or the brake pedal loosens a pure electric vehicle brake disc for ramp starting. Integral control over starting is achieved, ramp slipping prevention of a system can be guaranteed at the utmost, and safety of the vehicle is improved.

Road vehicle brake disc made of carborundum foamed ceramics/aluminum alloy composite materials and production method of road vehicle brake disc

Abstract: The invention discloses a road vehicle brake disc made of carborundum foamed ceramics/aluminum alloy composite materials and a production method of the road vehicle brake disc. The body of the reinforced-aluminum-alloy brake disc with a carborundum foamed ceramics framework is made of reinforced aluminum alloy materials such as aluminum alloy or nano ceramics particles or carbon nano-tubes. The carborundum foamed ceramics framework is integrally casted on two symmetrical friction surfaces of the brake disc, and heat dissipation grooves or air holes can be casted or do not need to be casted on the friction surfaces. A plurality of heat dissipation ribs are casted in the peripheral direction of non-friction surfaces. Mounting holes are formed in the disc body. The production method includes the steps of production of the carborundum foamed ceramics framework, preprocessing of the framework, design and production of a casting mold of the brake disc, lower-pressure casting of the brake disc, heat treatment of the brake disc, precision processing of the brake disc and storage of a finished product. The brake disc is simple in production technology, light in weight, high and stable in friction factor, high in heat conductivity, long in service life and applicable to existing road vehicles.

Thermal analysis of both ventilated and full disc brake rotors with frictional heat generation

Abstract: In automotive engineering, the safety aspect has been considered as a number one priority in development of a new vehicle. Each single system has been studied and developed in order to meet safety requirements. Instead of having air bags, good suspension systems, good handling and safe cornering, one of the most critical systems in a vehicle is the brake system. The objective of this work is to investigate and analyze the temperature distribution of rotor disc during braking operation using ANSYS Multiphysics. The work uses the finite element analysis techniques to predict the temperature distribution on the full and ventilated brake discs and to identify the critical temperature of the rotor. The analysis also gives us the heat flux distribution for the two discs.

Composite disc brake backing plate

Abstract: A brake backing plate is provided in which a non-compressible core material is sandwiched between two sheet metal stampings to make a lightweight, composite brake backing plate. Each of the stampings has a textured face with a plurality of integrally formed piercing members. By rolling or pressing, the piercing members of the textured faces are fully embedded in the core material, and thus lock the stampings and the core material together.

Carbon fiber reinforced magnesium base composite material for brake disc and preparation method of composite material

Abstract: The invention relates to a magnesium alloy brake disc, and in particular relates to a carbon fiber reinforced magnesium base composite material for the brake disc and a preparation method of the composite material. The carbon fiber reinforced magnesium base composite material for the brake disc is prepared by taking a magnesium-aluminum-zinc-manganese series magnesium base alloy as a matrix and micro-nano scale carbon fibers as a reinforcing phase of the magnesium alloy matrix, and carrying out a melt synthesis-compression molding method. Compared with the prior art, through carbon fiber reinforcement, the fatigue resistance and wear resistance of the magnesium base alloy material are improved, and the material is high in friction factor, good in braking effect and long in service life and can be applied to brake discs of various motor vehicles.

Brake vibration and noise: reviews, comments, and proposals

Abstract: Automotive brake noise and vibration control have become increasingly important for the improvement of vehicle quietness and passenger comfort. Studies of the problem can be traced back as early as the mid–1950s, but progress has been mainly confined to the explanation of mechanisms and the identification of the sources of brake noise and vibration. Many aspects of the problem still remain unsolved because of the complexity of the problem itself. This paper presents a comprehensive review of previous research on brake noise and vibration. The previous studies on the sources and contributions of drum and disc brake noise and vibration, on the methods and mechanical models used in experimental, numerical and theoretical investigations, and on the materials for brake friction and damping applications are summarised and discussed. The opinions and suggestions of the authors are presented with emphasise on the computer models with dynamic friction considerations and on the potential application of advanced structural composites.

Electric braking device for vehicle

Abstract: There is provided an electric braking device for a vehicle, which includes a brake caliper which is provided to a wheel, a pressing member which is provided to the brake caliper and is driven to press a friction member to a rotary member fixed to the wheel, an electric motor which is a power source to drive the pressing member, an electric power/signal line which supplies electric power to the electric motor or allows a first electric circuit provided in a vehicle body to communicate with a second electric circuit provided in the brake caliper, and a connector which relays the electric power line. The connector includes a terminal joining portion which joins one terminal and another terminal to each other, and the one terminal and the another terminal are made of metal. The terminal joining portion is positioned inside the brake caliper.

Structural and Thermal Analysis of Brake Disc

Abstract: Disc(Rotor) brakes are exposed to large thermal stresses during routine braking and extraordinary thermal stresses during hard braking. The aim of the project is to design, model a disc. Modeling is done using catia. Structural and Thermal analysis is to be done on the disc brakes using three materials Stainless Steel and Cast iron & carbon carbon composite. Structural analysis is done on the disc brake to validate the strength of the disc brake and thermal analysis is done to analyze the thermal properties. Comparison can be done for deformation, stresses, temperature etc. form the three materials to check which material is best. Catia is a 3d modeling software widely used in the design process. ANSYS is general-purpose finite element analysis (FEA) software package. Finite Element Analysis is a numerical method of deconstructing a complex system into very small pieces (of user-designated size) called elements.

Alloy cast steel for high speed train brake disc, heat treatment method thereof and high speed train brake disc manufactured by the alloy cast steel

Abstract: The invention discloses an alloy cast steel for a high speed train brake disc, a heat treatment method thereof and a high speed train brake disc manufactured by the alloy cast steel. The alloy cast steel is composed of the following components in percentage by weight: 0.18-0.26% of carbon, 0.16-0.50% of silicon, 0.55-1.40% of manganese, not larger than 0.03% of phosphorus, not larger than 0.03% of sulfur, 0.90-2.00% of chromium, 0.71-1.80% of nickel, 0.65-1.20% of molybdenum, 0.20-0.35% of vanadium, not larger than 0.30% of other components, smaller than 0.1% of tungsten and the balance of ferrum; and the heat treatment method comprises two steps of normalizing and tempering. The alloy cast steel disclosed by the invention has the beneficial effects that such alloy elements as manganese, nickel, chromium, molybdenum, vanadium, and the like, and such main components in the cast steel material as carbon, silicon and the like are reasonably mixed and are effectively thermally treated to refine the crystalline grain and improve the hardenability and heat resistant properties of the alloy cast steel material, and the normal temperature strength and the high temperature strength are greatly improved, so that the alloy cast steel material has excellent comprehensive mechanical properties. A brake disc manufactured by the alloy cast steel can meet the application requirements of high speed trains.

Automatic bolt tightening machine for wheel brake disc

Abstract: The invention discloses a tightening machine and particularly relates to an automatic bolt tightening machine for a wheel brake disc. The automatic bolt tightening machine comprises a main body and an electric control cabinet, wherein the main body is connected with the electric control cabinet and comprises a column steel frame and a horizontal steel frame; a vertical guide rail and a lifting cylinder are arranged on the column steel frame; a tightening device is movably mounted on the vertical guide rail in a clamped manner and fixedly connected with the piston rod of the lifting cylinder; the horizontal steel frame is arranged right below the tightening device and connected with the column steel frame; a horizontal moving cylinder and a horizontal guide rail are arranged on the horizontal steel frame; an automatic rotary workbench is mounted on the horizontal guide rail in a clamped manner and fixedly connected with the piston rod of the horizontal moving cylinder. The automatic bolt tightening machine for the wheel brake disc is convenient to operate, can effectively reduce the labor intensity of operators and ensure the precision and quality of tightening and assembly of bolts for the wheel brake disc.

Numerical investigation of fluid flow and heat transfer characteristics on the aerodynamics of ventilated disc brake rotor using CFD

Abstract: Ventilated brake discs are used in high speed vehicles. The brake disc is an important component in the braking system which is expected to withstand and dissipate the heat generated during the braking event. In the present work, an attempt is made to study the effect of vane-shape on the flow-field and heat transfer characteristics for different configurations of vanes and at different speeds numerically. Three types of rotor configurations circular pillared, modified taper radial and diamond pillar vanes were considered for the numerical analysis. A rotor segment of 20° was considered for the numerical analysis due to its rotational symmetry. The pre processing is carried out with the help of ICEM-computational fluid dynamics and analysis is carried out using ANSYS CFX 12.1. The three dimensional flow through the brake rotor vanes has been simulated by solving the appropriate governing equations viz. conservation of mass, momentum and energy using the commercial computational fluid dynamic stool, ANSYS CFX 12. The predicted results have been validated with the results available in the literature. Circular pillar rotor vanes are found to have more uniform pressure and velocity distribution which results in more uniform temperature drop around the vanes. The effect of number and diameter of vanes in the circular pillared rotor is studied and the geometry is optimized for better mass flow and heat dissipation characteristics.

Modeling and simulation of pneumatic brake system used in heavy commercial vehicle

Abstract: An air brake system is used in heavy commercial vehicles for the purpose to stop or slow down the vehicle. The effective braking depends mainly on the response time of the entire system. The brake system layout configuration has to be designed in such a way that the response time should meet the vehicle safety standard regulations. This paper describes the detailed modeling of the individual brake system products, right from the actuating valves, control valves, actuators and foundation brakes. Response time prediction for a typical 4X2 Heavy commercial vehicle has been done. Also a study on comparing the transient torque generated by the existing drum brake and an equivalent disc brake model was carried out. The layout was modeled in one of the commercially available multi-domain physical modeling software employing bond graph technique and lumped system. The effective braking depends mainly on the response time of the entire system and driver's feel. The response time is determined as the time elapsing between the beginning of the actuation of the control pedal and the moment the pressure in the actuator reaches 75 percent of its asymptotic value(1). The brake system layout configuration has to be designed in such a way that the response time should meet the vehicle safety standard regulations. The heavy commercial vehicle brake system layout is designed keeping various vehicle parameters like Gross Vehicle Weight, wheel base, Centre of Gravity of the vehicle, number of axles etc. The system layout design is extremely complex since it involves number of valves which have to function in a logical sequence during different stages of braking (Normal, emergency, and One circuit failed condition).Conventionally, the system layout design is arrived after many iterations based on field trials and experience. This method involves more lead time and cost till the layout is finalized. Hence the modeling and analysis of the system layout using AMESim helps us to predict the behavior of the layout in terms of response and the effect of the individual subsystems, valves on the system behavior and thereby optimization study can be carried out. This tool employs bond graph technique and lumped system for developing physical based modeling. Sridhar (2) Describes the modeling of foot brake valve and predicting the dynamic response of the individual valve.Wu (3) studied the robust of pneumatic brake system in commercial vehicle using AMESim. (4), (5),(6) describes the modeling of system by simplifying the valves and the actuators. This paper describes the detailed modeling of individual valves , and actuators by including all the design parameters, thereby makes the model flexible to study the role of each and every design parameter on system level response. Apart from this the paper deals the modeling of foundation brakes and compare the transient torque response of a typical drum and equivalent disc brake for a heavy commercial vehicle. This model can be directly coupled to the vehicle models and the dynamics of the vehicle like stopping distance, stability can be studied. This model can also be used for design and optimization of brake system layouts for various heavy commercial trucks having varying wheel base and Gross Vehicle Weight. II.

Sustainable Analysis in the Product Development of Al-Metal Matrix Composites Automotive Component

Abstract: In this paper sustainable analysis is performed due to the increasing demand for fuel efficiency. Current research focuses on high strength-light weight components in automobile which lead to the development of advance material parts with improved performance. A specific class of advanced material which has gained a lot of attention due for its potential is aluminium based metal matrix composites (Al-MMCs). Al-MMCs have some prospects for several applications in automobile parts. The analysis in this paper is a part of product development which plays a crucial role in determining a product's environmental impact. The objective was accomplished and thus to identify the potential of Al-MMCs rake disc for replacement of the conventional cast iron brake disc. The result indicated that the Al-MMCs have the potential to substitute the cast iron brake disc.

Simulation of Temperature Distribution in Disk Brake Considering a Real Brake Pad Wear

Abstract: This paper presents a methodology for the modeling of the transient thermal behavior of the disk brake of the vehicles using finite element methods. The influence of the wear properties of friction materials on thermoelastic behaviors is investigated to facilitate the conceptual design of the model. The coupled characteristics of the friction heat flow between the disk and pad as well as the effects of the brake disk thermal stress because of the variable applied pressure was considered. At the same time, the model was optimized by the experiment. Repeated brake processes with varying load, sliding speeds and temperature are applied in the simulation of the disk brakes. Experimental dependencies of the coefficient of friction and wear rate on the temperature of brake pad were approximated and applied to the model. The temperature and pressure on the contact surface of the pad/disk brake system obtained for constant and speed/pressure sensitivity applications were confronted and compared. The thermo-distribution is operated to visualize the disk temperature.