Railway vehicle brake shoe (versions)

FIELD: transport.

SUBSTANCE: invention relates to railroad transport, namely to brake shoes of rolling stock. In compliance with the first version, brake shoe comprises one-layer composite friction material rear surface of which has perforated bent steel band and wire carcass pressed therein. Said wire carcass is made up of two interconnected wires. Every carcass is made by bending wires with their ends connected. Wire ends connections cause no thickening of wire carcass along the shoe thickness. In compliance with the second version, brake shoe comprises one-layer composite friction material rear surface of which wire carcass pressed therein. Said wire carcass is made up of two interconnected wires. Every carcass is made by bending wires with their ends connected. Wire ends connections feature thickening of wire carcass along the shoe thickness. Wire ends connections are located at the center of wire carcass, nearby brake shoe outer side surface.

EFFECT: stable braking, recovery of wheel rolling surface, higher safety.

6 cl, 7 dwg

 

The invention relates to railway transport, namely to the brake pads of the brake of a rail vehicle.

Known composite brake pad of a vehicle containing a composition friction element, in Telnic which on the perimeter pads plated two closed frames, the inner part which are mutually overlapped and bent out the rear of the pads, forming an eyelet for passing the checks. In addition, Telnic equipped with a metal mesh or perforated sheet metal, plated in the friction material on the outside of the frame (USSR Author's certificate No. 518403, VN 7/020, 1976).

Description and formula of the copyright certificate, and other patent documents do not contain information about how the frames are closed. In the book Baserev. "Production of brake pads made of composite materials for railroad cars" (M, Chemistry, 1982, C.11-14, 27-28) is schematically depicted and described constructions composite brake pads with steel (metal) frame and mesh wire frame, describes the hardware features of the formulation and the technology of their manufacture. In the book schematically shows the image of the perforated workpiece and the wire frame, briefly described the technology of their manufacture and applicable tothis materials. For example, it is specified that the wire frame (fittings) made of steel wire with a diameter of 4 mm by cutting, bending, Assembly and welding, but it is not specified, for example, the shape and location of welded joints, the sizes.

The closest analogue is the prototype of the claimed invention is known from the prior art solution, namely composite brake wire mesh and wire frame for railway cars 25130-N, 25610-N, manufactured according to the specifications of the manufacturers THAT 2571-028-00149386-2000 THE 38 114166-75 and drawings Design Bureau rolling stock - branch of JSC "Russian Railways" (PKB black Russian Railways OJSC) Moscow, developed in 1975.

Composite brake wire mesh and wire frame according to the above drawings are made in 1976 several factories in Russia and Ukraine for all freight cars operating on the Railways of Russia, Ukraine, Kazakhstan and other countries of the former Soviet Union, and technical documentation for brake pads, including the drawings, is used by all manufacturers of brake pads, as well as all services of the rolling stock and depot engaged in the operation of the brakes.

Annual output pads brake composite with mesh wire frame SOS is to place several million pieces and now they made over a hundred million pieces. In operation annually wears out, and sometimes with complete destruction and denudation of the frame, several million pads with mesh wire frame and therefore their simple design public and well-known.

The design of the prototype presented in the drawings, the Design Bureau of the rolling stock in Moscow - branch of JSC Russian Railways, including:

- 25130-N SB - Assembly drawing pads;

- 25610-N SB - Assembly drawing pads;

- 25611-UL - Assembly drawing armature wire (wire frame);

- 25614-N - drawing blanks frame (perforated tylenol).

As seen from the drawings of the prototype, in the back of the composite friction element pads plated perforated curved steel strip (blank frame), which is pressed into the body of the friction element wire frame (reinforcement wire), consists of two frames (brackets) - external and internal, which vary in width. The internal frame is inserted in the external and connected with it by a welded connection in the area of their bend outwards, with the formation of loops to skip the checks. Each frame is bent from one piece of wire, the ends of which are superimposed on each other and are connected by welded lap-connection thickness of the pads. Each and the curved part of the overlapping ends of the wire overlapping each other in the plane perpendicular to the back surface of the pad, and connected to contact point welding. The working surface of the brake pads in cross section is made with a slope of 1:20 to the back surface corresponding to the slope of the running surface of the wheel with which it cooperates during braking.

Therefore, the thickness of the pads on the inner side surface of the pad, which when operating near the crest of the wheel is less than the thickness of the pads on the outer side of the pad opposite the inner side and the exploitation of the most remote from the wheel flange.

The inner side surface of the pads have a prototype made with the ledge, passing in a toroidal surface, which by the end of the operation, the pads are completely worn.

The working surface of the pad at the inner side of the pad having a smaller thickness, before (faster) in the process of operation is approaching the back side of the pad and to the protruding parts of the wire frame, in contrast to the working surface of the pad in the area of the outer side surface.

The disadvantage of the prototype is the same thickness from the back surface of the pad to the protruding parts of the wire frame and, above all, in the area of lap welded joints of the wire thickness of the pad at the inner and outer is ekovich surfaces of the pads, despite the fact that the block at the inner side surface has a significantly reduced thickness. This circumstance reduces the resource blocks in use.

In addition, the presence of the lap weld the ends of the wire thickness of the pad half pad with the inner side surface (minimum thickness) often causes damage to the wheelset because of the circular openings on the wheelset occurring by reason of its contact with the wire end on the long side of the frame, placed in the side area of the inner surface pads of the prototype.

The original thickness of the new brake pads shown in the drawings of the prototype and in the technical literature (Shiryaev B.A., Production train brake pads made of composite materials for railway carriages, M., Chemistry, 1982, p.72).

The thickness from the back surface of the pad to the protrusions of the metal frame depends on the design of the frame, species composition and its yield, quality manufacturing wire frame (to meet the required geometrical sizes), quality of manufacturing briquettes and finished product quality molds (to meet the required geometrical sizes with material shrinkage during cooling of the product after vulcanization).

Strata is from the back surface of the pad to the protrusions of the metal frame for the prototype - composite brake pads with mesh wire frame is:

- at the location of one wire (taking into account the flattening of the perforated steel strip) from 5 to 6 mm, and the spot welded lap-joints of the ends of the wire thickness pads each of the frames from 7 to 9.0 mm, the reduction of the diameter of the wire in the welding and flattening perforated steel strip.

The minimum thickness of the pad allowed for operation, is greater than the thickness from the back surface to protruding parts of the metal frame to prevent damage to the rim metal frame when braking, namely with regard to mileage and wear until the next inspection station.

The minimum thickness of the pad allowed for the operation defined in the Instruction manual brakes of railway rolling stock" (Publishing house "Inpress" with the assistance of the NPP transport, Omsk, 111395, Moscow, Alley 1st of May, 15, 1994, page 3, 12, 13). The minimum thickness of the pad, is allowed to operate, is also set separately for each type of pads and is:

for composite brake pads with metal back 14 mm;

for composite brake pads with mesh-wire skeleton - 10 mm (for the prototype).

In practice, however, due to the fact, th is the measurement of the thickness of the pads is made with the outer side of the pad, which has a greater thickness pads than the inner side of the pad, to avoid damage to the wheelset wire frame near the inner side of the pad, composite brake pads with mesh wire frame prototype is usually removed from cars (withdrawn from service) at a thickness of 14 mm or more.

In common with the prototype of the characteristics of the invention: "composite friction element, in the rear outside surface of which is plated perforated curved steel strip and wire frame made of two connected frames, each of which is bent from a wire, the ends of which are connected."

In recent years, is a lot of work on the selection of materials and creation of new designs of composite brake pads with solid inserts, for example of cast iron, which increase the braking efficiency of composite pads with ice and water in the zone of friction, smooth down the sliders and Navara due to their abrasiveness and high temperatures during braking is filled with molten cast iron cracks on the surface.

Known brake pad railway vehicle according to the patent of Russian Federation №69597 utility model containing composite freak the ion element, net-wire frame and solid box, the upper outside part of which is inserted in the wire frame and clamped in it.

Known brake pad of a rail vehicle, comprising a metal frame with U-shaped ledge in the Central part thereof and a solid insert, made of ductile or malleable cast iron and welded to the metal frame (RF patent for the invention №2309072).

This brake pad effectively fills the molten cast iron cracks on the tread surface of the wheel during normal braking and thereby prevents their further growth and increases the life of the wheel.

Known composite brake pads with solid inserts are used for the same purpose as the claimed brake pad, and have shared with her essential characteristics: "the Shoe is provided with a rigid insert that is connected with a wire frame"; "solid insert is made of ductile or malleable cast iron".

The disadvantages of the known composite brake pads with mesh-wire frame, including composite brake pads with solid inserts, including from high-strength cast iron, are the following:

- thick wire frame behind the insufficient resource deceleration is Noah pads, consequently, high replacement costs, especially in the case of application of the brake pads with inserts, more expensive than conventional composite pads;

- damage to the wheelset wire frame (loop output);

- the presence of a metal frame.

The task of the invention is the reduction of the minimum thickness of the pad, is allowed to operate damages wheelset because of the circular openings, increasing stability, braking performance with simultaneous recovery of the wheelset during normal braking.

The technical result is to improve the economic efficiency of the rolling stock and safety of its operation by increasing the service life of the brake pads, reducing damage to the wheelset and increase their life, and that means additional profits Railways.

This technical result for option 1 is achieved by the fact that in the back of the pads pressed steel perforated curved strip, and at the rear of the pads pressed into composite of at least a single layer of the friction element, the wire frame is made of two connected frames, each cat is, which is bent from wire, the ends of which are connected, for example, a welded connection. The welded connection can be done without increasing the thickness of the wire frame, the thickness of the pads, for example, in the form of lap-joints along the length of the pads, namely, each of the curved part of the parallel ends of the wire overlapping each other in the plane equidistant back surface of the pad, and is connected, for example, contact point welding.

Brake pad can additionally be equipped with at least one solid insert that is connected with a wire frame, for example, by crushing it and pressed into composite friction element. Solid inserts can be performed, for example, of ductile or malleable iron.

Such performance brake pads allows, in comparison with the known blocks, to provide a smaller and uniform thickness of the wire frame from the Central boss until the end of the wire frame along the length of the pads and to reduce the minimum thickness of the pads allowed for operation, to avoid damage to the wheelset wire frame during operation and to improve stability in braking performance with simultaneous recovery of the wheelset during normal braking.

As a consequence, the surface which agrees safe operation of rolling stock and provided additional income by increasing resource brake pads and wheels.

This technical result for option 2 is achieved by the fact that at the rear of the pads pressed into the composite, at least one-layer composite friction element, the wire frame is made of two connected frames, each of which is bent from a wire, the ends of which are connected with increase of the thickness of the wire frame on the thickness of the pads. Connect both ends of the wire frames are located on the half of the wire frame in the area of the outer side surface of the pad maximum thickness.

Connection of the ends of the wire frames can be performed, for example, in the form of welded joints, lap the thickness of the pads, as the prototype, angular and other or by linking thinner wire and other methods.

Brake pad can additionally be equipped with at least one solid insert that is connected with a wire frame, for example, by crushing it.

Solid inserts can be performed, for example, of ductile or malleable iron.

This embodiment of the brake pads can reduce the thickness of the wire frame by half in the area of the inner side surface of the pad minimum thickness and compared with the known blocks to reduce the minimum thickness of the pads, represen the Yu for the operation, to avoid damage to the wheel with a wire frame in comparison with the prototype, as well as to improve the stability in braking performance with simultaneous recovery of the wheelset during normal braking. As a result, improves the safety of operation of the rolling stock and provided additional income by increasing resource brake pads and wheels.

The thickness of the wire frame in the area of the smallest thickness of the pad compared to the prototype decreased (when the wire diameter 4 mm) with 7 mm to 4 mm by eliminating the connection of the ends of the wire with the increasing thickness of the wire frame in the area. As a consequence, the minimum thickness of the pad allowed for operation in comparison with the prototype, also decreased by 3 mm.

In accordance with known engineering solutions proposed composite brake pads can be made with a mesh wire frame or just a wire frame without shrunk in the back of the composite friction element pads perforated curved steel strips, as well as one - and two-layer, depending on the tasks that need to be addressed for a particular application.

The resource is commercially produced in the present composite brake pads is a mesh wire frame from the composition of tier-300 in accordance with these specifications is 90-200 thousand km Average mileage per 1 mm thickness of the pad is 3.5 thousand km the increase of the minimum thickness of the pad, is allowed to operate, will increase the resource serial brake pads on average 10 thousand kilometers or approximately 7%.

For modern, new wear-resistant composite brake pads this increase in the minimum thickness of the pad allowed for operation at 3 mm will increase the life of brake pads to 15 thousand miles and more.

When this reached the resource block with the use of wear-resistant materials ensures a planned replacement of the pads depot conditions with routine maintenance and repair of cars (i.e. equal to overhaul mileage cars).

Figure 1 shows a front view, a view in plan and cross section a-a, offer brake pads for railway vehicles according to option 1. Brake pad contains:

1 - wire frame consisting of two interconnected framework - external and internal;

2 - composite friction element (the diagram depicts a two-layer, but may be a single layer);

3 is perforated, curved strip steel, plated in the friction element from the back side pads;

4 - Central boss;

5 - supporting lugs;

6 - groove of the RA the eyes surface pads (pad may be made without groove);

7 - hole alert.

Figure 2 shows a front view and a view in plan of the proposed brake pads for railway vehicles with solid insert for option 2.

Brake pad contains:

8 - solid box, mounted in a wire skeleton, for example, by way of crushing;

1, 2, 3, 4, 5, 7 - the elements depicted in figure 1.

Figure 3 presents a General view of the wire frame for option 1.

Figure 4 presents a General view of the wire frame version 2.

Manufacturer offer pads can easily be produced on existing equipment manufacturers composite brake pads and frames for them without fundamental changes to existing technology, but taking into account additional data on technology and equipment, the above and other patents relating to pads brake composite with solid inserts.

Manufacture of composite brake blocks for railway transport of the proposed design will allow without increasing the cost pads to reduce the minimum thickness of the pads allowed for operation, to avoid damage to the wheel with a wire frame in comparison with the prototype, as well as to improve the stability in braking performance with simultaneous restoration of power the particular skating wheels during normal braking. As a result, improves the safety of operation of the rolling stock and provided additional income Railways by increasing resource brake pads and wheels.

Increased resource proposed structures pads when using modern wear-resistant compositions will provide overhaul mileage cars that will replace the pads in the conditions of the depot.

1. Brake pad railway vehicle containing at least a single layer of composite friction element at the rear part of which is plated perforated curved steel strip and wire frame made of two connected frames, each of which is bent from a wire, the ends of which are connected, characterized in that the connection end of the wire is performed without increasing the thickness of the wire frame on the thickness of the pads.

2. Brake pad railway vehicle according to claim 1, characterized in that it is further provided with at least one solid insert that is connected with a wire frame.

3. Brake pad according to claim 2, characterized in that the solid insert is made of ductile or malleable iron.

4. Brake pad railway vehicle containing at m is re, single-layer composite friction element at the rear part of which is plated wire frame made of two connected frames, each of which is bent from a wire, the ends of which are connected with a connection end of the wire is made with increasing thickness of the wire frame on the thickness of the pad, wherein the connection ends of the wire are located on the half of the wire frame in the area of the outer side surface of the pad.

5. Brake pad railway vehicle according to claim 4, characterized in that it is further provided with at least one solid insert that is connected with a wire frame.

6. Brake pad according to claim 5, characterized in that the solid insert is made of ductile or malleable cast iron.



 

Same patents:

FIELD: railway transport.

SUBSTANCE: bimetal braking clamp comprises arc-bent cast pig-iron bar furnished with a boss arranged at rear side center and having a bore to receive wedge-like cotter-pin to be fixed in clamp holder. Said cast pig-iron bar body has cylindrical inserts arranged in rows and made from material that features higher abrasive properties compared with those of bar material. Groups of inserts are separated by sections with no inserts, said inserts being point-welded to steel plate repeating the shape of and covering bar rear side. Steel plate is perforated to have 25 mm-dia holes in compliance with arrangement of inserts in bar body. Two inserts should be located opposite each round hole. Insert face overlaps round hole area for 1/3. Insert face is eclectically welded to round hole edge. In casting, mould is filled so that steel plate round holes are filled with pig-iron. Square holes are arranged along steel plate edges to receive pig-iron U-section bosses. Length of section with no inserts exceeds both width.

EFFECT: uniform wear of braking surfaces, wheels locking in all braking conditions.

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FIELD: railway transport.

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EFFECT: ease of manufacture.

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FIELD: metallurgy.

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Friction lining // 2364771

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.

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 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.

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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: railway transport.

SUBSTANCE: bimetal braking clamp comprises arc-bent cast pig-iron bar furnished with a boss arranged at rear side center and having a bore to receive wedge-like cotter-pin to be fixed in clamp holder. Said cast pig-iron bar body has cylindrical inserts arranged in rows and made from material that features higher abrasive properties compared with those of bar material. Groups of inserts are separated by sections with no inserts, said inserts being point-welded to steel plate repeating the shape of and covering bar rear side. Steel plate is perforated to have 25 mm-dia holes in compliance with arrangement of inserts in bar body. Two inserts should be located opposite each round hole. Insert face overlaps round hole area for 1/3. Insert face is eclectically welded to round hole edge. In casting, mould is filled so that steel plate round holes are filled with pig-iron. Square holes are arranged along steel plate edges to receive pig-iron U-section bosses. Length of section with no inserts exceeds both width.

EFFECT: uniform wear of braking surfaces, wheels locking in all braking conditions.

8 dwg

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

FIELD: railway transport industry.

SUBSTANCE: invention refers to railway transport industry, namely to braking mechanisms used at rolling railway equipment. Brake shoe includes steel plate, cast-iron arc-shaped body consisting of main and profile areas with made groove. The body is equipped with friction elements performed in a form of cylindrical inserts. From the back in the middle of the brake shoe body main area there is transverse lug with hole for V-shaped retaining key. At the back the main area of shoe arc-shaped body is equipped with mounting T-shaped lips at the edges for coupling with stop block and stiffeners in a form of triangular lugs. The depth of profile area lug exceeds the height of wheel tread flange by 0.85 of brake shoe main area thickness. Steel plate covers brake shoe back side, encloses transverse cast-iron lug and has holes in side surface at the level of lug holes for U-shaped retaining key. In the steel plate there are mounting holes for inserts fixing. Five metallic inserts are installed from the side of wearing surface perpendicular to groove outer side wall of profile area.

EFFECT: provision of brake shoe operation safety and effectiveness, elimination of thermodynamic cross cracks possible formation, increase of rolling equipment wheel life and provision of better heat extraction and cooling of brake shoe main and profile area working part.

10 cl, 10 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

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.

SUBSTANCE: bimetal braking clamp comprises arc-bent cast pig-iron bar furnished with a boss arranged at rear side center and having a bore to receive wedge-like cotter-pin to be fixed in clamp holder. Said cast pig-iron bar body has cylindrical inserts arranged in rows and made from material that features higher abrasive properties compared with those of bar material. Groups of inserts are separated by sections with no inserts, said inserts being point-welded to steel plate repeating the shape of and covering bar rear side. Steel plate is perforated to have 25 mm-dia holes in compliance with arrangement of inserts in bar body. Two inserts should be located opposite each round hole. Insert face overlaps round hole area for 1/3. Insert face is eclectically welded to round hole edge. In casting, mould is filled so that steel plate round holes are filled with pig-iron. Square holes are arranged along steel plate edges to receive pig-iron U-section bosses. Length of section with no inserts exceeds both width.

EFFECT: uniform wear of braking surfaces, wheels locking in all braking conditions.

8 dwg

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