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. Polymer composite features a discrete-structure polymer matrix.

EFFECT: higher stability of friction properties in high-torque friction contact and reduced noise.

 

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

Analogous to the claimed invention is a friction device, including a friction element of a polymer composite with a porous structure (see France application No. 2581149, IPC7F16D 69/02, 1986). The essential features of the analogue of the friction element from a polymer composite with a porous structure coincide with the essential features of the claimed invention.

The disadvantage are the counterpart in case of use of the product in high-speed vehicles is the lack of stability of the friction characteristics and low noise characteristics of the product due to the lack of compressibility and sorption capacity of the composite, due to the underdevelopment of the porous structure (small pore volume).

The prototype of the claimed invention is a friction device, including a friction element of a polymer composite with a porous structure (see Lapshin VP and other Effect of sorbed water on the strength and frictional properties of brake pads. Proceedings of the 3rd International Symposium on tribology friction materials "AROMI-97". Yaroslavl, 1997, s.257-260). The essential features of the prototype of the friction element from a polymer composite with a porous structure coincide with the essential features of the claimed invention.

The disadvantage of the prototype are also in case of use of the product in high-speed vehicles is the lack of stability of the friction characteristics and low noise characteristics of the product due to the lack of compressibility and sorption capacity of the composite, due to the underdevelopment of the porous structure.

The task, which is aimed by the invention, is to increase the stability of the frictional characteristics of the product under conditions of high friction contact and reduced noise characteristics by increasing the sorption capacity and compressibility of the composite by increasing the pore volume of the composite and provide a more developed porosity.

To achieve the technical result in friction product, comprising a friction element of a polymer composite with a porous structure, the composite made with the discrete structure of the matrix.

The essential features of the claimed invention "composite made with discrete matrix structure are different from the characteristics of the prototype.

Friction products is a friction element, if necessary fixed to the frame. The friction element may also include additional reinforcement in the form of frames, inserts, etc. Element is made of Polym REGO friction composite material, including a polymer matrix and various fillers such as particulate and fibrous. The friction element has a porous structure (typically, a microporous). The polymer matrix has a discrete ("granular") structure in which particles ("grains") matrix of interconnected particles of fillers, which gives the composite monolithic, provides transmission and distribution of stresses (loads) between the individual particles of the fillers. However, the matrix does not fill completely the space between the particles of the fillers. Such a composite structure can provide, for example, the following technology products. Prepared molding the mixture into a mixture of dispersed particles of fillers (including fibrous particles) and dispersed particles of a binder. The particles of the binder is taken in a quantity sufficient to fill the space between the particles and formation of monolithic polymer matrix. Then the mixture is molded product by the conventional methods.

A specific example of the invention is a pad disc brake car, polymer composite which contains a polymer matrix in an amount of not more than 8 wt.%. The total volume of the capillary pores in the composite is at least 20% of the volume of the composite.

Made the e friction element product of the polymer composite with a discrete structure of the matrix allows to improve the elastic properties of the material, to increase its compressibility and recoverability after compression, because a sufficient number of voids in the composite to compensate for stresses in the material by providing opportunities for internal deformation of the material structure. After removing the load provides the ability to restore the structure of the material. As a result, the porosity, good compressibility and resilience of the composite are provided with stable friction characteristics and reduced noise characteristics of the product.

Friction device, including a friction element of a polymer composite with a porous structure, wherein the polymer composite is made with discrete structure of the polymer matrix.



 

Same patents:
Friction lining // 2364770

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.

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 1000C, 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

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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