Brake pad railway rolling stock

 

The invention relates to the brake pads railway rolling stock. Brake pad railway rolling stock has a metal frame and polymer composite friction element. The mass of the metal frame is 0.43-0,49 by weight of the friction element. The technical result is improved performance and increased service life of the brake pads. 1 Il.

The invention relates to the brake pads railway rolling stock.

The analogue of the claimed invention is a rail brake pad containing polymer composite friction element mounted on a metal frame made in the form of the frame and provided with holes Telnice (see and.with. The USSR №518403, IPC761 N 7/02, 1976). The essential features of the analogue composite friction element mounted on a metal frame made in the form of Telnice” match the essential features of the claimed invention.

The disadvantage of analog is the degradation of the performance due to insufficient heat transfer pads in the environment and, in particular, in tormoznoy friction pair.

The prototype of the claimed invention is a rail brake pad containing polymer composite friction element mounted on a metal frame made in the form of Telnice of the metal strip (see B. A. Shiryaev. Production of brake pads made of composite materials for railroad cars. M.: Chemistry, 1982, S. 12-13). The essential features of the prototype polymeric composite element, fixed to the steel frame, made in the form of Telnice of metal bands coincide with the essential features of the claimed invention.

The disadvantage of the prototype is uneven thermal stress due to different thermal conductivity, heat capacity and emissivity of the frame and polymer element, which causes a significant gradient time and temperature of heating and cooling of the armature and the friction element during operation, resulting in possible deformation and cracking as a metal frame, and a friction element.

The task, which is aimed by the invention is the improvement of the operational characteristics of the pad and increase the service life due to the reduction of the mass of metal frame and a friction element.

To achieve the technical result in brake Shoe railway rolling stock containing polymer composite friction element mounted on a metal frame made in the form of Telnice of the metal strip, the metal mass of the armature and the friction element selected from the relation

where M1- weight metal frame;

M2is the mass of the friction element.

The essential features of the claimed invention “weight metal frame and a friction element selected from the relation

where M1- weight metal frame;

M2is the mass of the friction element”

are different from the characteristics of the prototype.

The invention is illustrated by drawings of specific example,

It presents the block, General view

The block polymer contains frictional element 1 and the metal frame 2, representing tylenol, i.e. the back (opposite the working portion of the pads. Weight of frame (M1) is 0.43-0,49 by weight of the friction element (M2). Metal frame is made prou matrix and various fillers, including fiber and dispersed.

A specific example of the invention is a rail brake pad comprising a polymeric composite friction element of the polymer composite with a matrix of a vulcanizate of the rubber and fillers, such as composite tier-300, and the metal Telnic, provided with a reinforcing plate 3. Weight Telnice is 0.46 by weight of the friction element.

Be made of the inventive pad can by known methods, for example by molding from a molding mixture.

Use the specified mass ratio of the metal frame and the friction element allows you to optimize thermal stresses in the pad during operation under conditions as high heatings and deep cooling pads, particularly for the harsh continental climate. If the mass ratio is less than 0,43, reduced bearing capacity of the frame and increases the possibility of overheating and cooling, which increases the stress in the contact zone of the armature and the friction element and, accordingly, the possibility of deformation and destruction of the framework. The mass ratio is more than 0,49, unduly increase the weight of the frame and increases vozmozhnostnogo dismantling pads when replacing them in the service process.

Claims

Brake pad railway rolling stock containing polymer composite friction element mounted on a metal frame made in the form of Telnice of the metal strip, characterized in that the mass of a metal frame and a friction element selected from the relation

where M1- weight metal frame;

M2is the mass of the friction element.

 

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Friction products // 2104197
Friction products // 2104196
The invention relates to friction products, in particular to the brake pads railway rolling stock that runs on electricity, pads and pads, disc and drum brakes for vehicles operated in cold climates (for example, the Far North)

The invention relates to the brake pads railway rolling stock

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

FIELD: railway transport; vehicle brake shoes.

SUBSTANCE: proposed brake shoe contains friction member and metal skeleton, being essentially perforated metal strip and wire frame combined with strip. Ratio of mass of metal skeleton and mass of shoe is 1:15 - 1:35, and ratio of mass of metal perforated strip and mass of wire frame is 1:1 - 1:6.

EFFECT: increased strength of shoe.

1 dwg

FIELD: railway transport; vehicle brake shoes.

SUBSTANCE: proposed brake shoe contains friction member made by hot mounding method from composition containing polybutadiene rubber, curing group, powder fillers and fiber. Friction member is made with ratio of fiber and power fillers in composition being 1:1 - 1:20.

EFFECT: increased strength of shoe owing to increased strength of friction member by choosing optimum ratio of fiber and powder fillers.

1 dwg

FIELD: railway transport vehicle brake shoes.

SUBSTANCE: proposed brake shoe contains polymeric friction member secured on metal skeleton being essentially perforated metal strip provided with hole for cotter and combined with closed frame. Plane of symmetry of hole for cotter asymptotically approaches plane of symmetry of shoe. Friction member is made by hot molding method from composition in which mass of rubber is 5-30% of mass of composition.

EFFECT: improved performance characteristics of brake shoe owing to higher strength indices.

1 dwg

FIELD: railway transport; brake shoes of rolling stock.

SUBSTANCE: proposed brake shoe contains metal wire frame with backing and with hole for cotter in central projection of shoe, and friction part with hard inserts. Insert made of metal in form of rectangle in longitudinal section with side walls over entire length of shoe and with, at least, two bridges from each side from central projection of shoe. Bridges contain fixing cavities for frame fittings, and composite friction element is arranged inside insert. Invention provides increase of braking efficiency of shoe if water or ice gets into friction zone, improves reliability of design of shoes operating in cold climate and frequent application of brakes.

EFFECT: increased service life of wheels.

3 cl, 5 dwg

FIELD: railway transport; brake shoes of rail vehicles.

SUBSTANCE: proposed brake shoe has metal skeleton-back with hole for cotter in central projection of shoe. Skeleton-back is made in plan in form of rectangle with side walls over entire length of shoe and with at least two bridges. Said bridges connect side walls being arranged symmetrically at both sides relative to central projection of shoe. Bridges are provided with fixing grooves for composite friction member arranged inside skeleton-back.

EFFECT: increased braking efficiency of shoe if water or ice get in friction zone, improved reliability of design of shoe in operation in cold climate and at frequent application of brakes.

3 cl, 1 dwg

FIELD: railway transport; brakes.

SUBSTANCE: proposed brake shoe contains metal skeleton with U-shaped projection in central part and compositive friction member and one hard insert. Hard insert is arranged in central part of shoe, being welded to metal skeleton. Hard insert is made of high strength or malleable cast iron. Ratio of area of working surface of hard insert to total area of shoe working surface if from 4% to 20%.

EFFECT: provision of cleaning and polishing action of hard insert onto wheel without impairment of operation of brake shoes at braking.

1 dwg

FIELD: railway transport; brakes.

SUBSTANCE: proposed brake shoe contains composite friction member, metal skeleton and hard insert. Metal skeleton consists of two parts, namely, main strip with projection in central part, and reinforcement plate welded to main strip. Hard insert is welded to reinforcement plate of metal skeleton in its central part by continuous weld in longitudinal and/or transverse direction.

EFFECT: increased strength and improved reliability of brake shoe.

1 dwg

FIELD: railway transport; brake.

SUBSTANCE: proposed brake shoe contains metal skeleton with projection in central part, composite friction member and hard insert. Shoe is furnished with two flat heat insulating elements arranged at both sides of insert between insert and friction and overlapping zone of their contact inside shoe along width and height of shoe. According to second version, shoe is furnished additionally with open slots at both sides from insert between insert and friction member, and overlapping zone of their contact inside shoe along width and height of shoe.

EFFECT: increased reliability of shoe by changing its design to increase heat resistance by preventing thermal cracks in body of friction member and its burning in place of contact with cast iron insert in manufacture and in service.

3 cl, 2 dwg

FIELD: transport.

SUBSTANCE: invention relates to railway transportation, particularly to train brake blocks. The brake block contains a metal carcass representing a basic band with a П-shape ledge in its central part, two side bosses and a friction ceramic metal element. The said metal carcass is furnished with a reinforcing plate, a copper-plated steel strip equal in length and width to the said friction ceramic metal element rear side and sintered to it at pressure in the furnace. The metal carcass basic band with the said П-shape ledge in its central part is welded from outside to the said reinforcing plate on the block rear in the holes specially made to this end in the metal carcass basic band and on both end faces of the brake block.

EFFECT: higher strength and reliability of ceramic metal brake block, easier manufacturability.

1 dwg

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