Rail vehicle brake shoe

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

 

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

The famous cast iron brake pads, including with a metal frame, manufactured according to GOST 1205-73 "Pads cast-iron brake for cars and tenders Railways. Design and basic dimensions".

These pads have a positive impact on the surface of the rolling wheel, but they have a low coefficient of friction and operation provide a low braking performance, and therefore require more effort tensioning linkage during braking, do not provide silent and smooth braking of a train, have a lot of weight (16 kg), high wear and high cost.

Known technical solution is used for the same purpose as the claimed, and has shared with him the essential characteristic "brake pad".

Known composite brake block containing friction element and metal (steel) frame. (Baserev "Production of brake pads made of composite materials for railroad cars", Moscow, Khimiya, 1982 (p.9-11, 13, 70).

The metal frame consists of one part - the main strip, and sometimes of two parts: the main strip and welded thereto on the inner side of the enhanced place the ins. The main strip of the frame has an outer curvilinear path around the perimeter of the finished block and in the center of the U-shaped or semi-circular protrusion, forming a Central boss. The Central boss of the frame is provided with holes for the pin (metal bracket). On the main plate of the frame are also two side lugs that serve as guides for the checks. The Central boss is used to fasten the brake pads in the brake Shoe by means of checks, and the guides (side boss) to simplify the installation checks.

Amplification plate is used to provide additional rigidity to the frame and improve the reliability of mounting frame with a friction element.

Amplification plate cut from a steel strip in the form of an octagon, with its main edge along the length and width of the bent inwards pads and form ribs.

Amplification plate has four holes, two on each side for welding to the main strip on both sides of the U-shaped protrusion, and has two curved pads inside holes for flowing friction mixture in forming to improve the fastening of the friction element.

On the main strip can also be cut holes and/or half holes with bending nevirapine part of the holes inside the pads from getting spikes for for the Cania into the holes of the friction mass in forming and improving the fastening of the friction element.

Brake composite block compared to cast iron has become significantly more widespread use, 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, during the operation of composite brake blocks can occur separate defects, including thermal cracks on the surface of the rolling wheels, the wear of the rolling surface of the wheels, reducing braking efficiency of the brake pads in contact with water in the friction zone (rain, snow), and in the presence of coal or peat dust and leaves on the surface of the rail.

The essential features composite brake pad friction element, a metal frame in the form of a "curved main strip with a U-shaped or semicircular lug with holes for the pin and the lateral boss" - guides for checks, as well as "reinforcement plate welded to the inner side of the base band are shared with the essential features of the claimed invention.

The closest analogue of the claimed pads is a brake pad of a rail vehicle on the application number 2005133046/22 (037001) from 26.10.2005 (the decision to grant a patent for utility model from 16.01.2006)./p>

Consider brake pad contains metal steel frame, composite friction element and a solid insert of cast iron. The metal frame consists of one part - the main strip and has a U-shaped protrusion forming a Central boss. On both sides of the U-shaped protrusion, the inner side of the main strip it is welded across the width of the pad solid insert of cast iron, represents in longitudinal section of the pad trapezoidal shape.

The essential features closest analogue composite friction element", "metal frame" and "solid box" are shared with the essential features of the claimed invention.

Pad on the closest analogue ensures the preservation of the rolling surface of the wheel, and therefore, an increased service life of the wheels while maintaining high durability pads, and provides stability and braking performance under normal and severe operating conditions.

However, the pad on the closest analogue has disadvantages when operating in severe conditions, for example at low temperatures in the Far North.

Due to the fact that the brake pad on the closest analogue metal frame is made of one part - the main strip with P-clicks the s ledge, without reinforcing plate, the rigidity of the metal frame is insufficient.

When the vibrations at low temperatures in the spot welding the insert to the main strip of metal frame with a continuous seam across the width of the insert can be formed in the main strip of the crack, leading to fracture of the frame in its width.

The task, which is aimed by the invention, is to increase the strength and reliability of the brake pads.

The task decides brake pad of a rail vehicle, comprising a metal frame made of two parts - the main strip with the tab in its Central part and a reinforcing plate welded to the main strip, the composite friction element and a solid insert of rectangular, trapezoidal or other shape. Solid insert is welded to the reinforcing plate metal frame with a continuous weld in the longitudinal and/or transverse direction in the Central part of it.

The essential features of the claimed invention "metal frame consisting of two parts - the main strip with a ledge in the Central part thereof and welded to reinforcing plates" and "solid insert is welded to the reinforcing plate by a continuous seam in the longitudinal and/or transverse direction are distinctive from significant at Nakov closest analogue.

Manufacturing technology pads is simple and involves the following stages:

- manufacturing (cast) cast iron insert;

- manufacturing (stamping) steel frame;

- manufacturing (stamping) reinforcing plates;

- welding of reinforcing plates to the main strip of the frame;

- welding the insert to the amplifying plate frame;

- fabrication of polymeric compositions;

- laying in the mold frame with welded reinforcement plate and the insertion and fixing of fluff and polymer compositions;

- molding pads in the mold under pressure and subsequent vulcanization.

As the metal for the manufacture of base band frame and reinforcement plate using mild steel.

The insert is made of cast iron of any brand.

The drawing shows a brake pad of a rail vehicle, where:

1 - the main strip of the frame,

2 - the ledge on the main strip of the frame,

3 - hole pin for fastening pads in the brake node

4 - composite friction element,

5 - cast iron insert,

6 - place welding the insert to the amplifying plate,

7 - amplification plate.

Performing a metal frame with reinforcing plate and welding solid insert to the base of the amplifying plate and/or R is Brum can significantly increase the stiffness, strength and vibration pads and exclude the formation of transverse cracks and fracture on the main strip of the frame.

Brake pad railway vehicle containing composite friction element, a metal frame and a solid insert, characterized in that the metal frame consists of 2 parts - the main strip with a ledge in the Central part thereof and a reinforcing plate welded to the main strip and the rigid insert is welded to the reinforcing plate metal frame in the Central part of a continuous weld in the longitudinal and/or transverse direction.



 

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