Friction product

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.

 

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 ferromagnetic particles of hard magnetic material (see RF patent №2104196, IPC7VN 7/02, 1998). The essential features of similar polymer composite friction element with ferromagnetic particles of hard magnetic material" match the essential features of the claimed invention.

The disadvantage of analog is the reduction of frictional characteristics during operation of the product due to the rather rapid degradation of the polymer matrix as a result of constant heat friction products due to the magnetization reversal under the influence of an alternating magnetic field in the case of a sufficiently large ferromagnetic particles in polymer friction composite.

The prototype of the claimed invention is a friction device, including polymer composite friction element with ferromagnetic particles of magnetic material (see RF patent №2104197, IPC7VN 7/02, 1998). The essential features of the analogue composite f is actiony element with ferromagnetic particles of magnetic material are similar to the essential features of the claimed invention.

The disadvantage of the prototype are insufficient frictional characteristics of the product in the initial period of operation due to the slow stabilization of the friction characteristics of the product, especially in the conditions of rather rare braking when the predominant operating a vehicle in the country mode.

The challenge which seeks the invention is to improve the frictional characteristics of the products by accelerating the stabilization process of the frictional characteristics of the product in the initial period of operation when the predominant operation in country mode by providing continuous heating of the product during magnetization reversal in the temperature range not causing rapid degradation of the polymer matrix friction composite.

To achieve the technical result in friction products, including polymer composite friction element with ferromagnetic particles of magnetic material, a friction element further contains particles of hard magnetic material with a ratio of soft and hard magnetic particles in the element of from 1:1 to 1.5:1. The essential features of the claimed invention "of the friction element further contains particles of hard magnetic material with a ratio of magnetic and magni is otwartych particles in the element of from 1:1 to 1.5:1 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 fillers of soft magnetic materials and hard magnetic magnetic material. Soft and hard magnetic fillers may be located on or in equal proportion, or magnetic filler may be more than 1.5 times, or the ratio of these fillers is within the specified range (from 1:1 to 1.5:1 for soft and hard magnetic filler, respectively).

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, a mixture of steel fibers from welding low carbon steel and carbon steel. The ratio of particles of low carbon and carbon steel between the 1.2 and 1.3:1, respectively, i.e. particles of low carbon steel by 20-30% larger than the particles of carbon steel. The Shoe is made by mixing a binder and fillers (in the th number of steel fibers), forming, thermal and mechanical processing of the product.

Use in the composition of the polymer composite is a mixture of soft and hard magnetic magnetic materials allows for preserving the high content of steel fibres in the composite to provide constant heating the product at the expense of magnetization reversal, and the ratio of ferromagnetic particles allows to obtain temperature, enabling acceleration of the process of stabilization of frictional characteristics, but which have not yet causing rapid degradation of the polymer matrix. The result is still in the initial period of use of the product to improve its frictional characteristics due to the acceleration stabilize them.

Friction products, including polymer composite friction element with ferromagnetic particles of magnetic material, characterized in that the friction element further contains particles of hard magnetic material with a ratio of soft and hard magnetic particles in the element of from 1:1 to 1.5:1, respectively.



 

Same patents:

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.

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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 plate // 2335670

FIELD: mechanics.

SUBSTANCE: friction plate has two holes and is made in a polymer anti-friction composite material reinforced by a thread or threads. The said polymer anti-friction composite material contains a smaller number of reinforcing threads compared to the other parts of the friction plate.

EFFECT: improved strength and operating properties allowed by reducing fracturing nearby holes.

Friction pad // 2324849

FIELD: mechanic.

SUBSTANCE: the invention relates to the area of mechanical engineering, in particular, to friction pads intended for operation in lubricated assemblies. The friction pad is designed as part of a cylindrical shell, on the internal surface of which rectangular grooves are made. The grooves located longitudinally to the pad length have the same width and depth. The grooves transversal to the pad length, have width increasing with the groove depth. This provides stability of friction characteristics of the pad and decreases friction pair wear due to providing of more favourable conditions for penetration of the lubricating oil to the friction contact area, more efficient cooling of the friction elements, and better cleaning of the friction contact area from the wear products.

EFFECT: increased stability of friction characteristics of pad and decreased friction pair wear.

3 dwg

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

Stop block // 2345922

FIELD: transport.

SUBSTANCE: stop block contains shoe with handle attached to runner by two rivets. Shoe has groves with antifriction material pressed-in. Groves in shoe may be made as slots in form of dovetail. Inserts may be made of powdered metal consisting of: 8-10 % Fe, 0.6-1 % Al2O3, 3.5-5 % C, 3.5-4.5 % Sn, with remaining part of Cu.

EFFECT: improvement of device performance and avoiding wheel locking.

3 cl, 2 dwg

FIELD: transport.

SUBSTANCE: brake block incorporates a carcass with mounting ledges arranged at the block rear edges, a boss with a central bore designed for fastening inside the shoe. The carcass rear is coated with a steel plate. There are chambers filled with friction elements arranged on the working surface side. The said steel plate represents a plate-like section spring with the ledges fitted under the show points of bearing. There is a corrugated fluoroplastic heat-resistant lining arranged between the steel plate and the carcass. The aforesaid spring and lining are furnished with cuts made opposite the carcass mounting ledges and the boss hole. The aforesaid chambers are divided into cells filled with friction elements. The chambers, cells and friction elements represent truncated pyramids or cones with their smaller base turned towards the carcass working surface and with lateral walls inclined at the angle α=10-15° to form a fixed dovetail joint. The carcass side surfaces feature two openings arranged on both sides opposite the chambers.

EFFECT: reliable and efficient braking at high speed, longer brake block life ensured by elastic interaction between brake block and shoe, reduced noise.

9 cl, 6 dwg

FIELD: transport.

SUBSTANCE: flangeless brake block incorporates a steel plate, a cast iron arc-like body furnished with friction elements arranged on the block friction side. The block body rear side has a boss with a hole receiving a wedge-type cotter. A lateral stop comes from the said boss, its surface representing a tapered surface with inclination of the generating line from the boss top towards the stop of β=30° and getting transformed into triangular reinforcements running perpendicular to the block side surface from its rear side. The block arc-like body main part represents a carcass with the chambers that can be divided into cells housing the friction elements. The chambers, or cells and friction inserts corresponding to them represent truncated pyramids or cones with their smaller bases turned towards the block friction surface and their walls inclined at the angle of α=10° to 15° to form a fixed joint of the dovetail type. The steel plate covering the main section rear side represents a plate shaped spring with ledges arranged under the shoe point of bearing and rests on the stop bulges. A corrugated heat-resistant fluoroplastic lining is arranged between the aforesaid spring and the block body.

EFFECT: reliable and efficient braking in high-speed conditions, longer life and lower noise.

8 cl, 8 dwg

FIELD: transport.

SUBSTANCE: braking block incorporates a steel plate, a black iron arc-like body made up of the main and section parts with a passage made therein and friction elements. The said friction elements are placed in the block main part body on the friction surface side and into the section body part, i.e. in the block passage. The block arc-like body main part represents a carcass with chambers that can be divided into cells to house the friction elements. The chambers, or cells and friction inserts corresponding to them represent truncated pyramids or cones with their smaller bases turned towards the block friction surface and their walls inclined at the angle of α=10° to 15° to form a fixed joint of the dovetail type. The steel plate covering the main section rear side represents a plate shaped spring with ledges arranged under the shoe point of bearing and rests on the stop bulges. A corrugated heat-resistant fluoroplastic lining is arranged between the aforesaid spring and the block body. The section part passage lateral wall is furnished with a truncated-pyramid cavities with their smaller bases facing the block passage friction surfaces, the said cavities housing the appropriate friction elements to form the aforesaid dovetail joint.

EFFECT: reliable and efficient braking in high-speed conditions, longer life and lower noise.

8 cl, 8 dwg

FIELD: machine building.

SUBSTANCE: brake block contains a polymer friction composite material with U-shaped transverse recess made on its working surface. The polymer friction composite material is fixed on a metal frame with U-shaped ledge in its central part. The said composite material incorporates an additional polymer friction element containing 40 to 96% of metal chips pressed in along the perimeter of the U-shaped recess on the working surface.

EFFECT: greater distance run between overhauls of the wheel pair.

2 dwg

FIELD: railway transport; brake systems.

SUBSTANCE: proposed brake shoe contains composite friction member, metal skeleton made of steel strip and hard insert welded to skeleton and arranged in central part of shoe, wire framing, central boss and two side bosses. Wire framing consists essentially of two closed frames press-fitted into composite friction material from rear side of shoe over perimeter of shoe, whose inner parts are relatively overlapped and bent outwards relative to rear part of shoe, thus forming eye to pass cotter pin. Central boss is provided with hole for cotter, pin. Two side bosses are made of composite friction material. Metal skeleton made of steel strip has width less than width of wire framing, being bent to radius of rear surface of shoe and press-fitted into rear surface of shoe between side bosses and under central boss. Composite friction member consists of two longitudinal layers of material. Strength of layer arranged from rear side of shoe is greater than that of layer arranged from working side of shoe.

EFFECT: increased strength of shoe.

2 dwg

FIELD: railway transport; vehicle brake systems.

SUBSTANCE: proposed brake shoe contains metal skeleton and composite polymeric friction member secured on skeleton. Composite polymeric friction member is manufacture of material containing fiber-like steel particles. Material of friction member contains additionally iron powder and iron ore concentrate in form of powder. Total content of iron containing components is 40-70% of mass.

EFFECT: improved operating characteristics of shoe, increased service life of wheels.

1 dwg

FIELD: railway transport; rail vehicle brake systems.

SUBSTANCE: proposed brake shoe contains friction composite member and metal skeleton with U-shaped projection in central part with two side bosses. Skeleton consists of two parts, one being bent to radius of holder of main strip with two side bosses, and central boss in form of u-shaped projection with four teeth secured on main strip by passing teeth through holes in main strip and bending teeth from inner side of skeleton at cold stamping.

EFFECT: reduced consumption of metal, weight of brake shoe, simplified manufacture of shoe.

1 dwg

FIELD: railway transport; vehicle brakes.

SUBSTANCE: proposed brake shoe of rail vehicle has off-axial conical working surface and cylindrical rear surface. Distance between axis of rotation of rear surface of shoe and working surface is greater than distance between axis of rotation of working surface and shoe working surface.

EFFECT: improved operating characteristic of shoe owing to reduction of possibility of cracking and breaking of edge parts of shoe in operation.

2 dwg

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