A railway brake pad nonasbestos, nonlead and semimetallic. Experimental investigations of brake pad shim properties. By phillip holifield and nick weil srjc, engr 45, fall 2009 semester disk brakes convert kinetic energy from the car into thermal energy by friction the brake fluid compresses the piston inside the brake caliper applying pressure to the brake pads connected to the axel rotating at the same speed as the wheel generally made out of steel commonly slotted or drilled for extra heat dissipation. The solution is to repair and clean the source of the contamination, replace the damaged pads and possibly also have the rotors reskimmed or replaced if. Friction material knott brake company offers a line of light to medium duty brake lining material. Nov 15, 2002 linings are attached to the brake shoe either by riveting or bonding. Material selection method in design of automotive brake disc. And, ma312 helps reduce maintenance costs and downtime. His invention led to the founding of the ferodo company, a firm that still supplies brake lining materials today. Brake lining the products the products of this application are in general friction materials. Their attractive thermal properties include a conductivity comparable to that of metals, a very high mass specific heat, and. Friction and wear behaviors of aircraft brake linings material. Mechanical properties and wear behavior of brake pad produced from palm slag.
Department of energy, assistant secretary for energy efficiency and renewable energy, office of transportation technologies prepared by oak ridge national laboratory oak ridge, tennessee 3783 l6285 managed by utb. Linings are glazed greater than 20% of lining friction surface. Friction materials, woven roll lining, flexible molded. This premium longlife friction material offers up to a 20% service life improvement over comparable products. Brake lining materials can be offered by par group in a range of asbestosfree materials. Material physical and technical properties operating conditions download pdf specific gravity gcm. Apr 12, 2012 a process for manufacturing brake linings that comprises the stage of cold heating of the friction material and compaction by using a punch with a surface having sinuosity 10 that presses the friction material 100 forming undulations on the surface 110, and the stage of heat premolding of the friction material at a temperature lower than. Brake pad material must also be porous so that water does not affect the friction coefficient. Nonasbestos brake lining material is used in the shipping industry transport industry and equipment of different industries as a part of the brake system. The first brake lining materials were woven, but in the 1920s these were replaced with molded materials that contained crysotile asbestos fibers, a plentiful mineral. Compositions, functions, and testing of friction brake.
Friction material manufacturing by midwest brake detroit. An appendix contains thermo physical properties of some. Linings are attached to the brake shoe either by riveting or bonding. There are several factors to be considered when selecting a brake disc material. Typical symptoms will be brake chatter, where the pads vibrate as the lining grabs and releases the rotors surface. The ability of brake pads has an important role is to absorb the amount of kinetic energy during braking. Characterization of brake pad friction materials wit press. Brake lining brake retardation amf4000 ff fade typical friction properties weart data 40 g weight loss brake drum hot friction hot 0. Compositions, functions, and testing of friction brake materials and their additives peter j. They boost their friction levels and slow down their contact, all the while extending the systems life by not letting the components wear down too quickly.
These include brake pads and brake linings for automotives and trucks see figure 1, heavy duty high temperature brakes e. The most important consideration is the ability of the brake disc material to withstand high friction and less abrasive wear. Properties brake lining material asbestos base palm karnel shell base periwinkle shell base banana peels base zircosil base zrsio 4 base 1 specific gravity gcm3 1. The brake lining properties examined are morphology, hardness, compressive strength, density, wear rate, porosity and ash content. Properties of brake linings used in industries and vehicles. Flexible and moulded friction materials escom brakes. Riveted attachment is simpler, but usable lining depth depends upon the depth of rivethead countersink. We doesnt provide brake lining material products or service, please contact them directly and verify their companies info carefully.
The three kinds of brake lining material are nonasbestos, semimetallic, and ceramic friction. The best brake lining materials brake liners brake linings. Asbestos base and asbestos free brake lining materials. Escom produces flexible linings for drum brake shoes made of flexible beral friction material used fordrum brake shoes in the automotive and agricultural sectors, for motorbike clutch linings and the braking systems of various industrial applications. The brake pad or lining is of essential importance for the effectiveness and user comfort of the brake system. Apr 06, 2018 but there three types of brake lining material make up the pads marketed today. A brake lining material must have good mechanical properties such as compressive. And with a little help, you will be able to find the right kind.
Paper open access mechanical properties and fluid absorption. To assist nasa in identifying a potential market for this material, sri has conducted a survey of the market for vehicle brake friction materials in the united states. Development of asbestosfree friction lining material from palm. The drum brake surface is aligned with shoe high spots on the brake lining. The cost of the brake pad would reduce by half if they are made locally in malaysia.
Fade resistance is a measurable property and is basically the ability of the. Drum brake linings for motorcycles, passenger cars, cartrailer. Trimat ltd is an advanced developer and manufacturer of friction materials for use in a wide variety of equipment and environments. Disc brake pads consist of the friction material itself, the pad carrier plate and, in some cases, silencing parts, pad wear warning devices and retaining or guiding elements. The material replacing it should have all these properties with no undermine.
Steel fibers, aluminium oxide, zinc oxide, iron oxide, magnesium oxide. Characterization of friction material formulations for brake pads. Brake lining manufacturers suppliers iqs directory. This includes aramid, graphite, sintered and friction. Pdf mechanical properties and wear behavior of brake pad. Established in 1962 the company has an excellent reputation for supplying premium quality products and customer service, at competitive prices to a worldwide customer base.
Asbestos has ample physical, mechanical and tribological properties. An appendix contains thermophysical properties of some. The result of wear rate to particle size was in agreement with nagesh et al. Carbongraphite materials have demonstrated good friction and wear properties in that they are nongalling and tend to be selflubricating ref. Meritor approved ma312 lining provides the superior stopping power required for demanding heavyduty linehaul and vocational applications such as construction, refuse and heavyhaul. Drum brake linings for motorcycles and industrial brake applications, commercial vehicles, cvt clutches and passenger car handbrakes. Ferodo company, a firm that still supplies brake materials today. Midwest brake has extensive experience manufacturing high quality, dimensionally accurate friction blocks. First four outofplane eigen modes of the brake pad with shim when analyzing both transfer functions a reduction of the oscillation amplitudes for the brake pad with shim is apparent, which leads to a signicant higher damping ratio.
The problem that often occurs in brake lining is wear due to shock loads by sudden braking 1. The brake lining material should not be hazardous and should be free from asbestos. Brake lining is a part of braking system, situated in between brake drum and shoe. Pdf asbestos base and asbestos free brake lining materials. The purpose of this paper is to produce and investigate a reliable and effective aircraft brake lining material.
The brake lining may also become contaminated by oil or leaked brake fluid. In 1901, herbert patented a block made from layers of textile material impregnated with rubber, if the block was to be used against steel, or wax, if it were to. High speed vehicles generate more heat during braking the brake lining material should have a high thermal conductivity to dissipate the heat produced. Material physical and technical properties operating conditions download pdf specific. Brake attaching hardware is broken, loose or missing. Linings are glazed 20% or less of lining friction surface. The material is high quality and durable with a superior performance and very good tensile strength. The material replacing it should have all these properties with no. The carcass consists of brass wire inserted yarns containing a mixture of organic and inorganic fibers, including kevlar. Brake lining, also known as brake pads and similar to brake bands and brake blocks, offer a barrier between components like brake shoes and rotors.
The technological advances achieved by nasa as it fulfills its mission of exploring space, have proved highly useful when applied to earthbound problems. Friction material data sheets premium brakes, brake pads. Index terms brake pads, characterization, friction. Development of environmentally friendly brake lining material.
Pdf the friction brake works as an indispensable guarantee for regular work and safety. Typical friction properties chase test sae j661a n ormal fr ict n c ld 0. Pdf characterization of brake pads by variation in. Brake lining materials must have the capability to work at high temperatures without much change in the coefficient of friction and wear rate. The brake lining having a higher coefficient of friction contribute to more efficient braking.
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