Railway vehicle block brake

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

 

The invention relates to brake devices, namely to the brake pads for rail vehicles.

The prior art commercially produced at present cast-iron brake pads, for example, produced according to GOST 1205-73 "cast iron Pads, brake for cars and tenders broad gauge Railways. Design and basic dimensions, and composition brake blocks for railway cars. Composite brake blocks for railway cars manufactured in Russia of two types:

with a metal frame made of a steel strip with a U-shaped ledge and welded to reinforcing plate;

- wire mesh-wire frame.

(see Baserev. Production of brake pads made of composite materials for railroad cars. M., Chemistry 1982, p.8-14).

The main significant external and constructive difference of composite pads with mesh wire frame of composite pads with steel metal frame is that the Central boss these pads are made of a composite material with internal reinforcement, which increases upregulations properties pads and as a result, shock-vibration pads and prevents separation of the composite material from the frame and destroyed the giving frame in place of the U-shaped ledge.

Brake composite block, compared to cast iron, has received significantly more and more widespread, as they have a higher coefficient of friction, less clicking and durability, several times higher service life, less weight, cost, and provide quiet and smooth braking of the train.

However, the operation of the composite brake pads can occur separate defects, including: thermal cracks on the tread surface of the wheels, the wear of the tread surface of the wheels, reducing braking efficiency of the brake pads when injected into the friction zone rain, snow, and in the presence of coal, peat dust or leaves on the surface of the rail.

The prior art composite brake pads containing one or more solid inserts designed to reduce the aforementioned disadvantages of composite brake blocks.

Known brake Shoe on the author's certificate of the USSR No. 159186 (20f.1, IPC 61h, 1963). Brake Shoe for railway rolling stock mainly composite comprises a pair of rigid inserts on the friction part. To increase the effectiveness of interactions pads with the wheel rim, a pair of rigid inserts are symmetrically located relative to the horizontal axis of the pad and perekryvaet friction portion across the entire width. The inserts are held by friction forces arising between them and the friction material pads. In the description of the author's certificate of the invention figure 1 shows a brake Shoe containing the back part of the metal frame.

The design of these pads do not provide the required reliability, as with long-term and emergency braking, especially in hot weather, there is an intensive heat transfer from the zone of friction on the surface of solid inserts, moreover, that the inserts have a higher thermal conductivity, so that the temperature of the composite material on the surfaces which are in contact with solid inserts, increases sharply and is fading and melting of organic materials including a binder included in a composite block, and therefore the fastening inserts weakened, and they fail to fulfill its purpose and can fall out of the block.

The essential features is the closest equivalent of "two solid insert", "friction material" are shared with the essential features of the claimed pads.

Known brake pad for patent for invention №2309072 (F16D 65/04, 2007), containing a metal frame with a U-shaped ledge in the Central part of the composite friction element and one solid insert, RA is put in the Central part of the pad and welded to the metal frame. Solid insert is made of ductile or malleable iron, and the ratio of the area of the working surface of a solid insert to the total area of the working surface of the pad is from 4 to 20%. Composite coleosperma brake pads with an insert made from special high-strength cast iron allow you to increase the life of the wheel, as used type of cast iron has a ferritic structure and graphite in the form of spherical or flaky inclusions, high mechanical properties, including tensile strength and elongation, resulting in the braking process at high temperatures, the iron melts and fills microcracks on the surface of the wheel, thus preventing further development of these cracks; improves wheelset and increase the resistance of the wheels to the formation of fishermen and other defects. In addition, insertion of special cast iron due to its inherent abrasiveness has at normal and low temperatures cleansing effect on the wheel, increases the roughness of the running surface of the wheel and increases the traction wheels with the rail and stability, braking performance, especially in autumn and spring.

However, this design pads when operating in conditions shock vibration occurs a separation of the friction elements is from the metal frame, and sometimes the destruction of a metal frame in place of the N-shaped protrusion. Furthermore, the presence of only one solid insert in the Central part of the pad reduces the functionality of this composite brake pads using insert of ductile or malleable iron.

Known technical solution is used for the same purpose and has in common with the claimed nuts essential features: "composite friction element", "solid insert of ductile or malleable cast iron".

Known brake Shoe for railway transport in the Russian patent for useful model №69597, comprising: composite friction element, the wire frame representing shrunk in the composite friction element back side pads on the perimeter pads, two closed frames, the inner part which are mutually overlapped and bent out the rear of the pads, forming an eyelet for passing checks, solid box, located in the Central part of the pad and pressed into composite friction element. Pad from the back side contains a metal mesh or perforated sheet metal, plated in composite friction element, the insert in the upper outside part has a groove on its rear side, pressed friction composite is a material with a hole for the passage of checks, console and symmetrically located along the length of the insert on each side, with the upper outside portion of the insert is inserted into the wire frame and clamped in it.

In this construction pads for the first time provides a flexible pinched the back outside part of the solid insert in the holes in the wire frame by nparalleled and aperpendicular his sides while taking inserted into the holes of the wire frame parts insert a special form, with experimentally selected size, and also supply outside part of the insert special grooves, ledges, slopes, consoles and other forms, providing locking and engagement of the insert with a wire frame.

Flexible pinched hard insert in a wire skeleton, along with internal reinforcement of the Central boss of the wire frame and solid inserts, and the securing metal elements in elastic composite friction element, for example, rubber binders, determines the ability of the pad during operation to upregulations deformation, to the extent possible for the composite friction element.

Therefore, this design of brake pads has a high shock and vibration resistance, which leads to high is rocheste pads. Since the fastening insert the wire frame is made outside the rear of the pads with the simultaneous presence of a groove on the back side of the insertion and consoles on both sides along the length of the insert, the block has a high resistance against the formation of a single vertical through cracks in the ground contact of the composite friction element with a solid insert because of their different thermal conductivity, and therefore, has a maximum resource exploitation in comparison with the considered equivalents.

As disadvantages discussed pads should be noted that only one insert that does not allow its application where you want a brake pad with two solid inserts.

Known technical solution is used for the same purpose and has in common with the claimed nuts essential features: "composite friction element", "wire frame"; "solid box"; "the nuts from the back side contains a metal mesh or perforated sheet metal, plated in composite friction element.

Known brake Shoe composition for railway rolling stock with spaced inserts (options) by the RF patent for useful model №67045.

In this block, containing one or two-layer composite of friction the th element, mounted on mesh-wire skeleton, there are cast-iron, or steel inserts, spaced from the axis of the pad. As can be seen from figure 1, 2, are given in the description of this patent, the Shoe contains two cast-iron, or steel inserts, one of which is located in one half of the pads, and the second in the other half of the block.

The disadvantages of this block are the following. The design of this block has insufficient strength, because in the process of operation reviewed pads are formed through cracks from the working to the back surface of the pad on the border between the insert and the composite friction element, due to their different thermal conductivity. As soon as the rift between the composite friction element and the solid insert comes from the working to the back surface of the pad and becomes the end-to-end, solid insert hangs on a wire frame and the block is destroyed.

Under the action of shock vibration load during operation at the considered pads quickly cracks at the boundary of the contact inserts with composite material due to the difference in their density and thermal conductivity and a large distance from the axis pads to solid inserts that interacts with the rolling surface of the wheel, compared to nuts, from which this distance is smaller.

For this reason, this pad has a very large minimum thickness of the pads, permitted for operation, in which a through crack has not formed and which, in turn, leads to a very small resource blocks.

Connection of steel, and especially cast iron inserts, with steel wire frame by welding, soldering or combined with a wire frame casting costly and time-consuming operation, and the bonding type lock is not enough clear, as it is not explained either in the description or in the drawings.

According to the description of the utility model insert this block is made of steel and cast iron, which do not recover the rolling surface of the wheel during normal braking by filling the microcracks on the surface of the wheel, for example, molten steel and molten cast iron, and thereby prevent their further development and does not allow to increase the life of the wheel.

The essential features is the closest equivalent of "two solid insert", "one - or two-layer composite friction element", "wire frame" are shared with the essential features of the claimed pads.

The challenge which seeks inventive brake pad, is to increase the strength and structural safety brake pads, increasing resource blocks during the operation, stability, braking performance, as well as in the formation of the tread surface of the wheel during braking, that is, increasing resource wheel.

The task solves offer brake pad for rail vehicles, comprising:

one - or two-layer composite friction element;

two solid paste;

- the wire frame representing shrunk in composite friction material rear pads on the perimeter pads, two closed frames, the inner part which are mutually overlapped and bent out the rear of the pads, forming an eyelet for passing cheques;

- if necessary, a metal mesh or perforated sheet metal, plated in composite friction element back surface of the pad.

Solid inserts are made and placed in the block as follows.

The rear part of each of the two solid inserts has a console located on each side of the insert along its length, and the back outside part of each of the two solid inserts has a groove along the length of the insert, which provides reduction through vertical cracks at the contact interface of the composite friction element with a solid insert. One of the two consoles each of the inserts is curled toward the back surface of the pad and placed in the Central boss on both sides of the axis of the pad, and thus overlaps tinutul console the other inserts is about the length of the pad in the middle of the length of the pad. This prevents the formation of a transverse vertical cracks in the Central boss, to increase the area of attachment of a rigid insert in reformowana to her composite friction element, at the expense of the Central boss, and therefore, increase the durability of fastening of rigid inserts in the Shoe and increase the minimum thickness of the pads allowed for operation, and means to increase the resource block.

Each of the inserts may get caught in the wire frame and insert together with the frame is pressed into the composite element in such a manner that the rear surface of the console inserts, except placed in the Central boss, are in one plane with the surface of the perforated sheet, the back side of the pad.

For this purpose, each of the inserts is inserted and fixed in one part of the wire frame and has at the rear outside portion equal to or less than the frame width and provided with protrusions and/or grooves to further restrict movement of the inserts in the wire frame height and/or length and/or width, and the length and/or width of the insert in place of the protrusions is greater than the length and/or width of the frame.

Solid inserts can be made of ductile or malleable iron, which restores the rolling surface of the wheels during braking.

Solid inserts from ageny in the block so their outside back surface when operating in contact directly or through the perforated tylenol with surface protrusions "toe" Shoe brake pads, in which it is installed, i.e. in the immediate vicinity of the Central boss.

Under construction pads minimum distance between the two parts of the solid inserts in contact with the rolling surface of the wheel, allows to minimize the destructive effect in the Shoe under the action of shock and vibration loads due to the difference of density and thermal conductivity of a composite material and solid inserts.

Below are the essential features of the claimed pads are distinctive from the closest counterpart:

- "Each of the two solid inserts has at least one console at the rear of the pads on each side along the length of the insert, and at least one of the consoles of each of the inserts located in the Central boss on either side of the mid-length pads".

- "Each of solid inserts can be trapped in a wire skeleton".

- "Solid inserts can be placed in the socket so that their outside back surface when operating in contact with the surface of the protruding parts of the Shoe, brake pad, where it's mouth is attached, in the immediate vicinity of the Central boss".

- "Solid inserts can be made of ductile or malleable cast iron".

Figure 1 shows the brake pad of a rail vehicle, where:

1 - composite friction element consisting of one or two longitudinal layers depending on the production version pads;

2 - wire frame, which is a plated

composite friction material rear pads on the perimeter pads, two closed frames, the inner part which are mutually overlapped and bent out the rear of the pads, forming an eyelet for passing cheques;

3 - metal mesh or perforated sheet metal, plated in composite friction element back surface of the pad (in the case of its use in the design of the pads);

4, 5 - two solid paste;

6 - Central boss;

7 - supporting lugs;

8 - pin hole in the Central boss;

9 - groove side of the working surface of the pad (only for the production version of the pad with groove).

Figure 2 shows a General view of the mesh-wire frame with pinched it hard inserts.

Figure 3 shows a General view of the rigid insert, where:

4, 5 - two solid inserts differing in size, as the scope of Otley which are stated from each other by a width;

11 console creased;

12 - direct console;

13 - the tabs at the consoles;

14 - ledges in the solid paste;

15 - the short console;

16 - groove along the length of the insert in the back outside part.

Figure 4 shows a diagram of installation of the pad in the Shoe brake pads. 17 - Shoe brake pad; 18 - brake Shoe; 19 - check.

The technology of manufacture of brake pads may include the following steps (operations):

- production (casting) inserts of ductile or malleable iron;

- production of blanks from a perforated sheet if necessary of its use in the construction of pads;

- fabrication and welding wire frame wire;

- build wire frame with solid inserts by crushing;

- manufacturing composite friction materials for working and non-working layers;

- alternate laying in the press-form the workpieces from a perforated sheet, wire frame and solid inserts, hanging outside layer with leveling and working layer with leveling composite friction materials and followed by molding under pressure in the press;

- vulcanization pads in the mold under pressure and at a temperature of;

- drilling holes for the pin in the brake Shoe.

In exceptional cases when using rusty is or contaminated metal reinforcement and inserts made of cast iron or when specific requirements on the durability of the pad can be cleaned up reinforcement and inserts degreasing or sandblasting machines and impregnation glue in the usual well-known technologies in order to improve the adhesion and fixing of the metal reinforcement with composite element.

All operations except the proposed Assembly wire frame with inserts, is described in detail in the technical literature (see Baserev. Production of brake pads made of composite materials for railroad cars. M, Chemistry, 1982, and presents equivalents).

Solid inserts are located in the block so that their outside back surface when operating in contact directly or through the perforated tylenol with surface protrusions "toe" Shoe brake pads, in which it is installed, i.e. in the immediate vicinity of the Central boss.

Solid inserts can be made of ductile or malleable cast iron by casting of the desired shape, for example, by the method of precision casting in accordance with the image of figure 2, does not require further machining.

Manufacture of solid inserts of ductile or malleable cast iron will, as mentioned above, not only to stabilize the braking performance in autumn and spring and clean the rolling surface of the wheel, but to restore it during normal braking.

To ensure the cleaning, polishing and vos is tavlyayuschego impact on the rolling surface of the wheel on the entire surface area of the contact pads with the wheel cross-section of the pad with insert has the form, not different from the shape of the pad in the other cross sections. To avoid breakage of the mold, and in accordance with the technical requirements on the block, the size of the insert in cross-section may be provided at a few mm less than that of the composite friction element.

The connection is solid inserts with a wire frame can be performed in a manner aligned with the wire frame of casting, welding or soldering or bonding wire, synthetic cord, braid, and in other ways, as well as flexible pinch a wire skeleton.

Flexible compression solid wire inserts in the frame, along with internal reinforcement of the Central boss of the wire frame and solid inserts, and the securing metal elements in elastic composite friction element, such as a rubber binder, determines the ability of the pad during operation to resiliently elastic deformation, to the extent possible for the composite friction element.

Therefore, this design of brake pads has a high shock and vibration resistance, which leads to high strength pads. Since the fastening insert the wire frame is made outside the rear of the pads with simultaneous on what iciam groove on the back side of the insertion and consoles on both sides along the length of the insert, the Shoe has a high resistance against the formation of a single vertical through cracks in the ground contact of the composite friction element with solid inserts because of their different thermal conductivity, and therefore, has a maximum resource exploitation in comparison with the considered equivalents.

When collecting inserts with a wire frame flexible way of crushing it, each of the solid inserts alternately, manually rotate approximately 30° with respect to the width of the wire frame, i.e. along the frame, and start inserting the long side along the length of the frame from the bottom frame so that the curved console insert went into the hole between the frame and the wire long side of the frame above the ledge of solid inserts, but the lower of the two ledges consoles, i.e. between them.

By further rotation of the insert in a horizontal position and at the same time with little effort manually pulling the second wire frame from the first (i.e. thereby increasing the width of the frame), having the following two tabs consoles insert, turning them from "under the wire" to "over the wire". Then release the wire from the drawn position in normal and thereby secure the insert in a wire skeleton.

If necessary, using a pneumatic press in the stamp or in the other way perform additional fixing bend of the wire frame with simultaneous jamming in her two inserts together or alternately.

In addition to jamming inserts in a wire skeleton Pets binding inserts together with wire, synthetic cord, etc. in the Central boss, which in the inserts can be provided for special notches.

After molding with a frictional material in the press under pressure and vulcanization pads in the mold under pressure and at a temperature insert with mesh wire frame will be pressed into composite friction element so that the rear surface of the console inserts, except placed in the Central boss, are in one plane with the surface of the perforated sheet or the back side of the pad.

The implementation of the inventive brake pads new design with features indicated in the characterizing part of the formula, can improve the stability, braking performance, structural strength pads and extend the life of brake pads and wheels in operation.

The rugged, reliable design of composite brake pads with solid inserts of special ductile or malleable cast iron, in turn, will allow to achieve stable braking performance, including icing and rain, to improve the heat dissipation in the environment, to provide cleaning, polishing and vosstanavlivayuschaya on the rolling surface of the wheel, fill tiny cracks on the tread surface of the wheel cast iron at its melting at high temperatures and, thereby, to prevent their further development and, consequently, to increase the life of the wheel and the resource block.

1. Brake pad railway rolling stock containing at least a single layer of composite friction element, the wire frame plated in composite friction material of the back side of the pad, two solid insert connected with a wire frame, wherein each of the two solid inserts has at least one console at the rear of the pads on each side along the length of the insert, and at least one of the consoles of each of the inserts located in the Central boss on both sides from the middle of the length of the pad.

2. Brake pad railway rolling stock according to claim 1, characterized in that each of the solid inserts clamped in the wire frame.

3. Brake pad railway rolling stock according to claim 1, wherein the rigid insert is located in the block so that their outside back surface when operating in contact with the surface of the protruding parts of the Shoe, brake pad, in which it is installed in the immediate vicinity of the Central the boss.

4. Brake pad according to claim 1, wherein the rigid insert is made of ductile or malleable cast iron.



 

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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

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: railway transport; brake shoes.

SUBSTANCE: proposed brake shoe contains metal skeleton, polymeric composite friction member, one or several abrasive friction inserts and support layer placed between polymeric composite friction member and metal skeleton. Support layer is placed also between polymeric composite friction member and abrasive friction insert (inserts), or between polymeric composite friction member and part of surface of abrasive friction insert (inserts). Invention is aimed at improving operating characteristics of shoe owing to increased strength of connection of insert (inserts) and polymeric composite friction member by additional locking and reduced possibility of burning out of polymeric composite friction member in zone of insert (inserts) owing to provision of heat insulation of member relative to insert.

EFFECT: increased service life of shoe.

3 dwg

FIELD: railway transport; brake shoes.

SUBSTANCE: proposed brake shoe contains metal skeleton and fitted-on composite friction member consisting of two longitudinal layers of different thermal conductivity. Lower conductivity layer is made of composite friction material of greater adhesion to metal and strength as compared with layer arranged at working surface of shoe. Thickness of lower heat thermal conductivity layer is less than minimum thickness of shoe approved for operation, but is greater than thickness from rear surface of shoe to projecting parts of metal skeleton. According to second design version, brake shoe contains metal skeleton and fitted-on composite friction member consisting of two longitudinal layers and cast iron insert arranged in central part of shoe. Lower thermal conductivity layer is made of composition friction material featuring higher adhesion to metal and strength, as compared with layer arranged from working surface of shoe. Thickness of lower thermal conductivity layer is less than minimum thickness of shoe approved for operation, but is greater than thickness from rear surface of shoe to projecting parts of metal skeleton.

EFFECT: increased strength, improved reliability and increased service life of shoe.

3 cl, 2 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.

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