RU158159U1 - BRAKE SHOES FOR ROLLING COMPOSITION OF RAILWAY TRANSPORT - Google Patents

Abstract

The utility model relates to railway transport, namely, brake pads for rolling stock of railway transport. The brake shoe for railway rolling stock includes a composite friction element, a metal frame is pressed into the back of it, consisting of two narrow and wide frames interconnected, made of wire, the inner parts of which are mutually overlapped and bent outward of the back of the block, forming an eye for transmission checks, while both frames are made of low-carbon steel wire with a diameter of 3.5-4 mm and tensile strength of 600-900 kgf / mm ² by bending the wire and connecting its ends at an angle of 90 ^at the points of contact with the formation of closed parts in both frames, and both frames do not contain protruding outward ends of the wire.

Description

The utility model relates to railway transport, namely, brake pads for rolling stock of railway transport.

At present, in brake systems of rolling stock of railway transport - wagons, electric locomotives, diesel locomotives, brake pads are mainly used, in which a brake element made of composite friction material is used to contact the wheel surface.

Such pads include a metal frame pressed into the brake friction material. They are characterized by a significantly higher coefficient of friction, higher wear resistance, while ensuring silent and smooth braking of railway cars.

Usually a metal frame is two frames connected from each other at an angle, made of wire, the inner parts of which are mutually overlapped and bent outward of the back of the block, forming an eyelet for passing checks.

A brake shoe for a railway vehicle is known, which includes a composite friction element, a wire frame is pressed into the back of it, made of interconnected wide and narrow frames, each of which is bent from a wire to form closed and open parts, while the ends of the wire are not interconnected, and one end of the wire of each frame is directed to the outer side surface of the block, and the other end to the corresponding end side surface of the block, Rich unclosed space frames selected with the relation: P ₁ / P ₂ = 0,04 ÷ 48, where P ₁ - area of an open portion of the general frame, P ₂ - an open area portion narrower frame (patent RU 2397092, IPC B61H 1/00, 2010 g.).

A disadvantage of the known technical solution is the presence on the part of open parts with wire ends directed to the end side surface of the block, which increases the total length of the metal frame and does not exclude the possibility of the ends of the wire beyond the boundaries of the block during its manufacture in case of even slight displacements of the metal frame during production , which leads to the manufacture of defective pads.

Closest to the claimed technical solution is a brake shoe for rolling stock of railway transport, including a metal frame, pressed into a composite friction element, where the specified metal frame includes two interconnected frames, one of which is made of wire with the formation of a closed part and an open part, and the second frame is made with the formation of an open part, while the ends of the wire are not connected, but in a frame made with a closed part and not closed In parts, one end of the wire is directed to the outer side surface of the shoe, and in the frame made to form a closed part, one end of the wire is directed to the outer part of the shoe, and the frame is made to form a closed part without forming an open part, and one of the ends of this the framework does not go beyond the closed part of the framework (RF patent No. 138491, IPC B61H 1/00, F16D 65/06, F16D 69/02, publ. March 20, 2014).

The disadvantage of the brake pad known from the prior art is the insufficiently high strength of the metal frame, the high percentage of defects in the manufacture of pads, due to the presence of an open part in one of the frames and the presence of wire ends that are not interconnected, which can lead to exposure of the metal frame in the finished product and, accordingly, the release of defective products.

The objective of the utility model is to create a brake shoe for rolling stock of railway vehicles with increased strength of the metal frame, the inability to expose the metal frame in the finished product and improved characteristics of the composite friction element.

The problem is achieved in that in the brake shoe for rolling stock of railway transport, which includes a composite friction element, a metal frame is pressed into the back of it, consisting of two narrow and wide frames interconnected, made of wire, the internal parts of which are mutually overlapped and bent outward of the back of the block, forming an eyelet for passing checks, according to a utility model, both frames are made of low-carbon steel wire diameter m 3,5-4 mm and a resistance to rupture of 600-900 kgf / mm ² by bending the wire and its connections ends 90 ^at the points of contact to form a closed pieces in both the framework, both frames contain no protruding wire ends.

In addition, the composite friction element is a composite based on rubber binder material, which contains dispersed and fibrous fillers and has the following physical and mechanical parameters: Brinell hardness 1.1-3.1, friction coefficient in pair with steel 0.3- 0.7, linear wear paired with steel not more than 0.15 mm, tensile strength not less than 15.0 MPa.

In addition, the frames are interconnected at the contact points of the outwardly bent outward parts of the narrow and wide closed frames.

In addition, the connection of the ends of the wire of both frames and frames to each other is performed by the resistance welding method.

The claimed metal frame is made of two interconnected wide and narrow frames made of low-carbon steel wire with a diameter of 3.5-4 mm and tensile strength of 600-900 kgf / mm ² This wire can withstand up to 4 cycles of bending and bending without breaking the wire. The wire was received directly from the manufacturer - PAT "Dniprometiz". The connection of the ends of the wire in both frames is made at an angle of 90 ^at the point of contact and both frames do not contain protruding outward ends of the wire.

A metal frame made in this way completely eliminates the possibility of the appearance of defective products in the process of manufacturing pads and exposing the metal frame in the finished block.

The composite friction element used for the manufacture of the block is a composite based on a rubber binder material containing dispersed and fibrous fillers and has the following physical and mechanical properties: Brinell hardness 1.1-3.1, friction coefficient in pair with steel 0 , 3-0.7, linear wear paired with steel not more than 0.15 mm, tensile strength - not less than 15.0 MPa.

The following graphic materials are provided for a better understanding of the utility model.

FIG. 1 - general view of the brake pads with a metal frame pressed into the composite friction element;

FIG. 2 - top view of the brake pads;

FIG. 3 is a top view of a metal frame of a brake pad for a rolling stock of a railway vehicle after its formation with wire ends extending outside the framework;

FIG. 4 is a top view of the metal frame of the brake pad for rolling stock of railway vehicles with the removed ends of the wire;

FIG. 5 is a side view of a metal frame of a brake pad for a rolling stock of a railway vehicle;

In FIG. 1 shows a general view of a brake shoe for a rolling stock of a railway vehicle, which includes a metal frame 1 pressed into a composite friction element 2.

In FIG. 2 shows a top view of the brake pad, where the dashed line shows the metal frame 1.

In FIG. 3 is a top view of a metal frame 1 of a brake pad for a rolling stock of a railway vehicle.

The metal frame 1 intended for reinforcing the composite friction element is obtained from interconnected narrow frames 3 and wide frames 4. The ends of the wire that forms the frames 3 and 4 are interconnected at points of contact 5 and 6 by superimposing one end of the wire on the other and connecting them together by resistance welding.

In FIG. 3 it is seen that the ends of the wire are interconnected at an angle of 90 °.

As a result, only closed parts 7 and 8 are formed in each of the frames.

Frames are obtained by bending wire on special technological equipment.

The metal frame shown in FIG. 3, contains the ends of the wire 9 and 10, which remained after the technological operation of bending the wire and protrude beyond the boundaries of the frames 3 and 4.

In FIG. 4 shows a metal frame 1 ready to be pressed into a composite friction element, in which the protruding ends of the wire are removed.

The best results are obtained when low-carbon steel wire with a diameter of 3.5-4 mm and tensile strength of 600-900 kgf / mm ² are used for the manufacture of frames 3 and 4. Such a wire can withstand up to 4 cycles of bending and extension. This makes it impossible to destroy the wire during bending during the manufacture of frames 3 and 4.

In FIG. 5 is a side view of a metal frame, which consists of a narrow frame 3 connected to each other and a wide frame 4 at the point of contact 11.

The presence of only closed parts and the absence of protruding wire ends beyond the borders of the frame allows to increase the strength of the frame and makes it impossible for the ends of the wire of the metal frame to go beyond the friction element, and also helps to avoid unwanted deformation of the frame during the manufacture of the brake pads, which also saves wire consumption in the manufacture of frames.

It is clear that the above example of the implementation of the metal frame of the brake pads is only illustrative and does not limit the scope of rights of the utility model, which is determined by the formula of the utility model given below.

Claims (4)

1. Brake pad for railway rolling stock, which includes a composite friction element, a metal frame is pressed into the back of it, consisting of two narrow and wide frames interconnected, made of wire, the inner parts of which are mutually overlapped and bent outside the back of the block , forming an eyelet for passage checks, characterized in that the two frames are made of low carbon steel wire with a diameter of 3.5-4 mm and a resistance to rupture of 600-900 kgf / mm ² pU em bending wire and compounds of its ends at an angle of 90 ° at points of contact to form a closed pieces in both the framework, both frames contain no protruding wire ends. 2. The brake shoe according to claim 1, characterized in that the composite friction element is a composite based on a rubber binder material containing dispersed and fibrous fillers, and has the following physical and mechanical properties: Brinell hardness 1.1-3.1, the friction coefficient paired with steel 0.3-0.7, linear wear paired with steel not more than 0.15 mm, tensile strength not less than 15.0 MPa. 3. The brake shoe according to claim 1 or 2, characterized in that the frames of the metal frame are interconnected at the contact points of the bent outward inner parts of a narrow and wide closed frame. 4. The brake shoe according to claim 1, characterized in that the connection of the ends of the wire of both frames and the frames to each other is performed by contact welding.

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