Friction lining

FIELD: automotive industry.

SUBSTANCE: invention relates to automotive industry, particularly to automotive friction disk or drum brake shoe linings. Proposed lining comprises polymer composite friction element of porous structure and communicating cavities. Aforesaid friction element comprises particles made from material in high-elasticity state at normal operating conditions. Particles sizes correspond to pore sizes or exceed them at least 15 times.

EFFECT: longer life.

 

The invention relates to friction devices, in particular, blocks and pads, disc and drum brakes for vehicles, brake pads for rail transport and other

Analogous to the claimed invention is a friction device, including polymer composite friction element with composite particles of the elastic-plastic material (see RF patent №2078263, IPC7F16D 69/02. 1997). The essential features of similar polymer composite friction element with particles of elastic-plastic material" match the essential features of the claimed invention.

The disadvantages are the counterpart lack of compressibility of the friction element, causing unwanted sound effects and vibration during operation, and irreversible deformation of the friction element with a significant contraction due to the plastic properties of the material, which affects the operational characteristics of friction products.

The prototype of the claimed invention is a friction device, including polymer composite friction element having a porous structure with interconnected voids (see Vperson and other Effect of sorbed water on the strength and frictional properties of brake pads. Proceedings of the 3rd International Symposium on the tribologie friction materials AROMI-97, Yaroslavl, 1997, cc.257-260). The essential features of the prototype polymeric composite friction element having a porous structure with interconnected voids" match the essential features of the claimed invention.

The disadvantage of the prototype is the possibility of destruction of the porous structure of the friction element during strong contractions, leading to irreversible deformation of the element and its structure, loss of the element of the ability to recover from operational compression and thus to premature wear and deterioration of friction and other operational characteristics.

The challenge which seeks the invention is to improve the friction and operational characteristics of the product by reducing the possibility of the destruction of the porous structure of the friction element when operating the contraction and increase its ability to recover from compression.

To achieve the technical result in friction products, including polymer composite friction element porous structure with interconnected voids, the friction element contains particles of material in the highly elastic state under normal operating conditions of the product, and the particle sizes correspond to the sizes on the item or exceed not more than 15 times. The essential features of the claimed invention "of the friction element contains particles of material in the highly elastic state under normal operating conditions of the product, and the particle sizes correspond to the sizes of the pores in the element or exceed not more than 5 times" are different from the characteristics of the prototype.

Friction product includes polymer composite friction element and, optionally, a metal frame. The friction element is made of a polymeric friction composite based on a polymeric binder with various fillers, including fiber and dispersed, including a filler made of highly elastic material, preserving the highly elastic state when the operating conditions of a product in the friction node. The size of the filler particles larger than the pores in the composite is not more than 15 times.

Be manufactured friction products may known methods.

A specific example of the invention is a pad disc brake of the vehicle, a friction element which is made of a polymer composite containing, in addition to other fillers, particles made of special rubber. The dispersion of the filler corresponds to the porosity of the element, the particle size of ~ 0.5 mm Pad is made secenespressure and fillers (including highly elastic particles), forming, thermal and mechanical processing of the product.

Use in the composition of the polymer composite particles of a material capable of large (up to hundreds of percent) reversible deformation under conditions of actual product use, causes compression of the filling of pores in this composite material, which prevents the destruction of the porous structure of the friction element. After removal of the compression material frees the pores, which helps to restore the composite after compression. The result is improved operational performance friction products.

Friction products, including polymer composite friction element porous structure with interconnected cavities, characterized in that the friction element contains particles of material in the highly elastic state under normal conditions of use of the product, and the particle sizes correspond to the sizes of the pores in the element or exceed not more than 15 times.



 

Same patents:

FIELD: railway transport.

SUBSTANCE: invention relates to railway transport, particularly to railway vehicle block brakes. Block brake comprises at least one-layer composite friction element, wire carcass and two solid inserts. Aforesaid wire carcass is pressed in the composite friction material on the block brake rear side. Solid inserts are jointed with the wire carcass. Each of two solid inserts has at least one ledge on the brake rear part, on every side along the insert length. One of the said ledges is arranged in central boss, on both sides from the block center.

EFFECT: higher-efficiency braking, increased durability and longer life.

4 cl, 4 dwg

Friction product // 2361131

FIELD: machine building.

SUBSTANCE: invention relates to friction products, particularly, to blocks and linings of the vehicle disk and drum brakes. The proposed friction product includes a polymer composite friction element with ferromagnetic particles from magnetically soft material. Additionally, it comprises the particles of magnetically hard material with the ratio of magnetically soft-to-magnetically hard particles making from 1:1 to 1.5:1, respectively. As a result, friction properties are improved due to accelerated stabilisation of friction characteristics during initial operation in, primarily, out-of-town conditions. This has been achieved because of constant heating of proposed product during reversal magnetisation under temperatures that cause no fast destruction of friction composite polymer matrix.

EFFECT: improved friction properties.

FIELD: chemistry.

SUBSTANCE: invention refers to the method for oxidation defence of the article made from composite carbon-containing material and having the residual open inner pores. The said method includes at least one stage of composite material impregnating to depth with the impregnating composition containing at least one metal phosphate in the solution and titanium diboride in the form of the powder with particle size in the range from 0.1 mcm to 200 mcm. The invention refers also to the article obtained by the aforementioned method. Invention is developed in related items of invention formula.

EFFECT: invention provides the article oxidation defence at temperatures more than 1000°C, particularly in the presence of carbon oxidation catalyst and in wet conditions.

10 cl, 12 dwg, 9 ex, 3 tbl

Friction product // 2353837

FIELD: mechanics.

SUBSTANCE: invention relates to friction elements containing a polymer composite layer to be operated in various friction assemblies in contact with a metal counter body. The proposed friction product comprises a friction element made in a polymer binder, dispersed fillers, fibrous reinforcing and metal-containing fillers. The friction element comprises additionally not over 2.5 % of a material made from powder high-molecular polyethylene as filler.

EFFECT: higher friction-wear properties due to higher friction and mechanical-effect.

FIELD: engineering industry.

SUBSTANCE: invention refers to engineering industry, and namely to manufacturing methods of friction items with firm inserts, which are meant for various transport types. Method is realised by hot moulding of shoe from polymer compound in a moulding tool under pressure at simultaneous alignment thereof with metal frame and firm inserts. Hot moulding is carried out in moulding tool with grooves located in a punch that forms the shoe working surface in firm insert location areas. Process projections are formed from polymer friction material on shoe working surface in those zones; then, shoe working surface is machined and process projections are removed, thus providing arrangement of working surfaces of firm inserts and polymer friction material in one plane. Moulding tool used for shoe manufacturing consists of a matrix and upper and lower punches. Punch forming the shoe working surface is equipped with grooves meant for each of the inserts arranged in location areas of firm insert working surfaces. Each groove is bigger than the appropriate insert.

EFFECT: providing the possibility of manufacturing railroad transport means brake shoe and locating working surfaces of firm inserts and working surface of friction material of shoe friction element in one and the same plane, providing efficient operation from the very beginning of brake shoe operation, and minimising the number of expensive friction material waste appearing during machining of shoe working surface.

2 cl, 3 dwg, 4 ex

FIELD: transport.

SUBSTANCE: braking block comprises metal carcass, composite material friction element and two solid inserts arranged symmetrically relative to the block horizontal axis and overlapping its friction part over the width. The said metal carcass represents a wire carcass representing two closed frames press-fitted into the block rear part friction material and perforated tin press-fitted into the block rear part composite friction material. Inner parts of the said frames are partially interoverlapped and bent outwards from the block rear part to form an ear designed to pass the cotter. Rear nonoperating part of every cotter has consoles arranged on each side of the aforesaid inserts all along their length. One of the said consoles is bent towards the block rear surface and arranged in the central boss, the other one being located between the central and auxiliary bosses. Each of the inserts is fitted into one of the wire carcass frames and jammed therein. The inserts, along with the carcass, are pressed in the composite friction material so that the insert console rear surfaces are located in one plate with the perforated tin of the block rear side.

EFFECT: higher durability and safety, longer service life, sable braking capacity and wheel surface recovery in braking.

3 cl, 3 dwg

Gasket // 2341702

FIELD: machine building.

SUBSTANCE: invention relates to machine building, particularly, to components used for separation of stacked porous plates in production process. Proposed circular gasket has opposed first and second surfaces with multiple holes. The said gasket is made of metal wire screen and partially form multiple radial gas-passages, each passing between the gasket inner and outer radial sides to inter-joint them. Method of preparing circular carbon fiber blanks for chemical filtration in vapor phase consists in stacking the aforesaid carbon fiber blanks. Between every two circular blanks, a circular metal screen cushion is laid so as to make stacked circular blanks and circular gaskets form interfaces of internal space inside a stack. Every circular gasket has first and second opposed surfaces and is made so as to form multiple radial gas passages communicating the stack inner space with outside space.

EFFECT: updating production process.

20 cl, 11 dwg

Gasket // 2341701

FIELD: machine building.

SUBSTANCE: invention relates to machine building, particularly, to components used for separation of stacked porous plates in production process. Circular gasket is made of carbon material whereon an adhesive coat layer is applied and incorporates opposed first and second surfaces. Note that at least one of the said surfaces has multiple radial channels each passing between the gasket inner and outer radial sides to inter-joint them. Method of preparing circular carbon fiber blanks for chemical filtration in vapor phase consists in stacking the aforesaid carbon fiber blanks. Between every two circular blanks, a circular metal screen cushion is laid so as to make stacked circular blanks and circular gaskets form interfaces of internal space inside a stack. Every aforesaid circular gasket comprises adhesive coat layer applied thereon to prevent sticking of circular carbon blanks. Method of producing one-piece circular carbon-material gasket consists in forming one-piece circular carbon-material gasket with opposed first and second surfaces and radial channel and applying adhesive coat layer on the said circular gasket.

EFFECT: updating production process.

22 cl, 11 dwg

FIELD: transport.

SUBSTANCE: invention refers to railway transport, namely to brake blocks of railway vehicles. Brake block contains composite friction element, metal frame made of steel strip and solid insert welded to it, wire frame, central boss with orifice for splint and two side bosses. Metal frame of steel strip is less in width than wire frame, it is radiussed over brake block rear surface and pressed in brake block rear surface from both sides of solid insert between side bosses and central boss. Wire framework is essentially two closed up frames around block periphery pressed into composite friction element in the rear part of brake block. Inner parts of two closed up frames overlap each other are folded outside rear part of brake block forming an eye for a splint. Side bosses are made of composite friction material. Solid insert has slot open from the side of its rear surface is enclosed in wire frame and pressed in central boss so that its rear surface is in same plane with central boss rear surface. Enhancement of strength of brake block construction and tool-life gain are reached, as well as spoilage reduction in their manufacturing.

EFFECT: enhancement of strength of brake block construction and tool-life gain are reached, as well as spoilage reduction in their manufacturing.

2 dwg

FIELD: transport.

SUBSTANCE: invention refers to railway transport, namely to brake blocks of railway vehicles. Brake block contains composite friction element, wire framework, solid insert located in central part of block and pressed into composite friction element. Wire framework is essentially two closed up frames around block periphery pressed into composite friction element in the rear part of brake block. Inner parts of two closed up frames overlap each other are folded outside rear part of brake block forming an eye for a splint. The block contains in its rear part wire-mesh or perforated metal sheet pressed into composite friction element. Insert has slot in its upper idle part pressed by composite friction element with orifice for splint and cantilevers symmetrically located over insert length from each side. Upper idle part of insert is put in wire frame and jammed in it. Enhancement of strength, reliability of brake block construction, tool-life gain are reached.

EFFECT: enhancement of strength, reliability of brake block construction, tool-life gain are reached.

4 cl, 3 dwg

Friction article // 2245467

FIELD: mechanical engineering.

SUBSTANCE: friction article is made of a polymeric friction composite reinforced with fibers. The diameter of openings for rivets is larger than that of the reinforcing fibers by a factor of 2-8.

EFFECT: enhanced reliability.

Friction article // 2246645

FIELD: mechanical engineering.

SUBSTANCE: friction article comprises indicator of wearing mounted on the side of the article and made of hollow and projection. The indicator comprises at least two surfaces one of which is a wall and the other one is a flat surface. The plane of the flat surface of the indicator is nonparallel to the plane of the side surface of the article.

EFFECT: improved visibility of wearing indicator.

4 cl, 7 dwg

Friction article // 2251035

FIELD: mechanical engineering.

SUBSTANCE: friction article comprises friction member and metallic structure whose surface is covered with a paint. The paint covering is hard and has relief surface which is defined by the alternating projections and hollows. The hollows receive metallic particles the hardness of which is less than that of the structure metal.

EFFECT: enhanced noise suppresion and simplified design.

2 dwg

Friction article // 2265759

FIELD: mechanical engineering.

SUBSTANCE: proposed friction article contains metal skeleton with holes and molded-on friction member. Friction member is provided with bosses corresponding to holes in skeleton and fitted in holes. Friction member is made of polymeric friction composite. Density of composite of bosses is lower than that of other parts of friction member. Invention is aimed at increasing resistance of connection of skeleton and friction member to shift loads under variable thermal loads in process of operation of friction article and reducing mass of friction article and reducing mass of friction member as a whole.

EFFECT: improved manufacturability.

1 dwg

Friction article // 2269546

FIELD: friction materials.

SUBSTANCE: invention relates to technology of preparing asbestos-free friction article for use in a variety of friction mechanisms (brake assemblies of motor cars and equipment). Friction article comprises 15% of polymeric binder, 6% of reinforcing component, 46% of powdered interaction filler, 32% of metal-containing filler, and, additionally, 1% of pulp composed of fibers degrading at temperature 130-250°C arising on working surface of friction article upon braking. Fibers are selected from group including cotton, cellulose, and viscose fibers.

EFFECT: improved performance characteristics of articles due to reduced probability of formation of gas and liquid phases on friction couple surfaces upon braking.

1 tbl

Friction lining // 2270384

FIELD: mechanical engineering.

SUBSTANCE: friction lining is made of reinforced polymeric friction composition material. The reinforce is made of threads. The inclination of the threads to the plane of the linings varies in thickness of the lining. The angle has a minimum in the vicinity of one surface of the lining, and has a maximum in the vicinity of the opposite surface of the lining.

EFFECT: enhanced reliability.

Friction article // 2270944

FIELD: mechanical engineering.

SUBSTANCE: friction article is ring-shaped and has composite friction member. The friction surface of the friction member is provided with radial grooves. The radial grooves are made in the top section of the outer radius and in the bottom section of the inner radius of the article. The radial grooves are continuous and their width and depth are no less than ¼ of the thickness of the friction article.

EFFECT: enhanced reliability.

1 dwg

Friction article // 2270945

FIELD: mechanical engineering.

SUBSTANCE: friction article comprises metallic frame, friction member made of a polymeric composition and secured to the metallic frame by means of adhesive layer, and means for indicating wear of the friction material. The means for indicating the friction member wear is made of the substrate whose thickness is uniform and is no less than the permissible thickness of the worn friction member. The substrate is positioned from the side of the metallic frame and is made of as polymeric composition as the friction member. The substrate is additionally provided with particles of the material which sounds in the friction of the substrate on the metallic surface, which indicates that the thickness of the worn friction member reaches its permissible value.

EFFECT: enhanced reliability.

1 dwg

Friction article // 2277193

FIELD: mechanical engineering; friction articles.

SUBSTANCE: proposed friction article contains flat reinforcement skeleton and friction member molded to skeleton. Layer of friction member adjoining skeleton is reinforced additionally by means of notched-and-drawn metal sheet fixed on skeleton by welding. Welded joint is formed by separate spots arranged so that at least two wells spots are located in direction of shifting friction member relative to skeleton in operation.

EFFECT: reduced possibility of thermal deformation of skeleton, increased strength of skeleton-to-friction member joint, simplified process of forming high-strength joint of skeleton and friction member.

2 dwg

Friction member // 2283973

FIELD: mechanical engineering; friction members with polymer composite friction components.

SUBSTANCE: proposed friction member has metal framework and polymer composite friction component mounted on it. Polymer composite friction component consists of layers; each layer consists of polymer matrix and filler (or fillers). Polymer composite friction component is made from at least three layers including layer located on working surface of component which is made from unhardened polymer matrix and filler (or fillers); mass ratio of polymer matrix to filler (or fillers) exceeds that of polymer matrix to filler (or fillers) in layer (or layers) of polymer composite friction component located between layer on working surface and layer which is in contact with metal framework. Layer which is in contact with metal framework has ratio of matrix to filler exceeding ratio of matrix to filler in layer (or layers) of polymer composite friction component located between layer which is contact with metal framework and layer located on working surface. Service characteristics of article are improved due to reduced vibrations because of enhanced dampening ability of laminated composite component.

EFFECT: improved service characteristics; reduced running-in time due to charging of working surface in the course of initial period of operation.

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