Railway car brake composite shoe

FIELD: transport.

SUBSTANCE: proposed shoe comprises steel carcass, arc-like body composed of the main and lateral parts in contact with wheel surface. Arc-like body consists of separate elements secured at steel carcass. Note here that elements of the body main part are made from friction material while those of lateral section are made of antifriction material. Friction material friction factor is 1.5-10 times higher and abrasion resistance 1.5-3.5 times higher than those of antifriction material. Friction elements of clamp main part feature different height. Higher friction elements are located at steel carcass edges.

EFFECT: higher safety.

5 cl, 4 dwg

 

The invention relates to railway transport, in particular to the brake equipment of the rolling stock, and can also be used on other modes of transport in brake systems.

Known brake pad on Avtv 1572889, VN 1/00, publ. 23.06.90 containing steel frame, cast-iron arched body, consisting of a main and profile plots made it a stream and is provided with inserts laid in rows in the body of the pad by the working friction surfaces, and ridge insertion profile area is made in the form of a cylindrical element with a longitudinal cut and installed in the Creek pads with the possibility of setting and interaction with the crest of the wheel tread.

However, in the known technical solution inserts made of special cast iron with high hardness, and hence cause heavy wear surfaces of the wheels. In addition, the execution of inserts of the main site prismatic, with a continuous friction surface, affects the heat sink and contribute to the greater wear of friction pairs and reduce the braking force due to the reduction of the coefficient of friction.

Known brake pad containing a steel frame, curved body, consisting of a main body part pads and core body pads made it rucl the m In the body of the pad by the working friction surfaces on the core plot laid one row Diablo inserts, made in the form of a cylindrical element with a longitudinal cut, covering the crest of the wheel tread. On the main plot laid rows of at least two groups of cylindrical inserts. In each group the centers of the three nearest inserts equidistant from each other, and the ranks of these inserts deployed relative to the longitudinal axis of the pad. The insert is made of ductile metal, for example steel. Patent No. 2153994, IPC 7 VN 1/00, F16D 65/04, 69/00, bull. No. 22, 10.08.2000. This solution is taken as a prototype.

A disadvantage of the known brake pads is the reduction of the braking effect when heated pads, due to overheating inserts the friction coefficient decreases. Block creates noise during operation. The block has no lubricating effect of the wheel flange and the rail.

The objective of the proposed technical solution is to increase the safety of railway cars, the improvement of the ecological situation in the area of the braking train, reduction of operational costs for maintenance of railway carriages.

In the process of solving the task is achieved technical result, which was to reduce the level of noise during braking, snizeni the wear of the wheel flange and the side surface of the rail, the increase time between maintenance of wheelsets of rail cars, the reduction in the consumption of brake pads, improving stability and reliability of the brake system.

The technical result is achieved wagon brake pad containing a steel frame, curved body, consisting of a main body part pads and lateral part of the body of the pad in contact with the ridge surface of the wheel and cooperating with the side surfaces of the rail, while the arcuate body of the pad consists of separate elements, mounted on a steel frame, and the elements that make up the main body of the pad, made of friction material, and the elements that form the lateral part of the body pads are made of anti-friction material in the form of profiled elements being in contact with the ridge of the wheel surface that interacts with the side surfaces of the rail friction material is 1.5-10 times the coefficient of friction and 1.5 to 3.5 greater abrasion resistance than that of anti-friction material, the friction elements forming the main body part pads have different height, the friction elements with greater height are located at the edges of the steel frame. In addition, the friction elements forming the primary side and at ASDI body pads, fixed by welding on a metal frame and between a metallurgical method, the friction elements of the main body part pads made of composite friction material, operating at temperatures up to 850C, the friction elements of the main plot pads at least two friction elements of the lateral area of the pad is at least two.

The destruction of the wheelset occurs as a result of contact in the system "brake pad - wheel"and "wheel - rail", i.e. the wheel is subject to wear from the brake pads and side rail. The authors proposed technical solution studies were performed on the running surface of the rail wheels of the car in contact with the brake pads, made of cast iron. We studied the mechanism of formation of microcracks in different parts of the contact surface of the wheel. Fragments of various stages of destruction shown in figure 1.

Photo No. 1-4 shows defects, such as cracks and visibly with a maximum penetration depth of up to 1.5 mm. In photo # 4 shows the zones cracks originated at some distance from the surface. The appearance of such defects due to high contact pressure. With the further development of internal cracks is an exit to the surface with subsequent ocsla the requirement (margin) particles. Such particles further work as abrasive particles, leading to intense wear of the wheel surface. The formation of microcracks occurs gradually and has several stages. Cracks begin to develop long before fracture during fatigue, plastic and even fragile form of destruction. The duration of the process of accumulation of material defects, to the emergence and further development of cracks, occupies a significant portion, reaching up to 90% of the time of the destruction process.

Not to bring up the appearance on the contact surface (rolling surface) of the wheel of microcracks, this surface should always be cleaned from contamination and the removal of the surface layer. Such removal may be held in the braking process, provided that the brake pad has a higher abrasion resistance than the material of the rim wheel of the car and has a high coefficient of friction. We offer brake pad has a steel frame, which is fixed to the friction elements, and the elements that make up the main body of the pad, made of friction material, and the elements that form the lateral part of the body pads are made of anti-friction material, the friction material is 1.5-10 times the coefficient of friction and 1.5 to 3.5 greater abrasion resistance than antimic the ionic material. These pads allows you to clean the surface of the wheel and to carry out the lubrication of the wheel flange and the side surface of the rail head. Regular cleansing wheelset from contamination and loose areas in the braking process, the lubrication of the wheel flange increases the turnaround time of service wheelset associated with the replacement of worn wheels, also decreases the consumption of brake pads, as the abrasion resistance of the composite alloys 2-4 times higher than iron and steel. Since the contact surface system "brake pad wheel made of composition, because this will reduce noise pollution in the braking process.

The friction elements, which form the main part of the body have different height, the elements with higher elevation are located at the edges of the steel frame. This design, when the deflection of the body of the pad in the middle part when the pressure on the pad during braking, leads to tight fit the entire surface of the main site pads for faster grinding pads and to improve the reliability of the brake system.

The second surface of the wheel subjected to intensive wear of the surface ridge. Particularly the wear of this surface occurs when magic cube MOV and on curved roads. To reduce the wear surface of the crest features on its surface, spread a layer of antifriction material, apply this layer should brake pad during braking. In order to place such a process, the proposed technical solution, the anti-friction elements, forming the lateral part of the body pads are made of anti-friction material having a lower abrasion resistance and 1.5-2.5 lower coefficient of friction than the material of the friction elements forming the main body part pads. In the process of braking every time will be the contact side of antifriction elements with the surface of the wheel flange. Because the abrasion resistance of the side antifriction elements below the abrasion resistance of the material of the wheel rail will be the transfer material antifriction elements on the surface of the wheel flange, and subsequently on the rails, and when driving in curves is reduced wear of the wheel flange and the side surface of the rail.

The proposed solution is illustrated by drawings, where figure 2 presents a General view of the pads, a top view, figure 3 shows a General view of the pad, side view, figure 4 is a section along the section a-a figure 3.

Brake wagon composite block contains a steel frame 1, the arcuate body 2 consisting of a main phase the body pads 2.1 and side body part pads 2.2. The arcuate body of the pad 2 has a separate friction elements 3, which are fixed on a steel frame 1. The friction elements 3 that form the main part of the body 2.1 pads, made of a frictional material having 1.5-10 times more abrasion resistance and 1.5-2.5 greater coefficient of friction than the material of the anti-friction elements 4 forming the lateral part of the body pads 2.2. The friction elements 3 that form the main body section 2.1, have different heights. Elements with higher height 3.1 are located at the edges of the steel frame. The friction elements 3 that form the main body of the pad 2.1 fixed by welding (not shown) on the metal frame 1. The friction elements 3 of the main body part 2.1 pads made of composite friction material, operating at temperatures up to 850C.

The operation of the brake pads is as follows. When pressing the working surface of the pad to the working surface of a wheel of a railroad car is braking and smearing (rubbing) ridge surface of the wheel. In the future, when movement occurs, the contact ridge between the wheel surface and the side surfaces of the rail. Because the ridge on the surface of the wheel there are particles of anti-friction material pads, lubrication occurs is the iron surface of the rail and reduces its wear.

The possibility of producing, using different materials and technologies friction and antifriction elements can improve their quality and to obtain technical indicators pads with the specific requirements depending on the working conditions of railway wagons.

1. Brake wagon composite strip containing a steel frame, curved body, consisting of a main body part pads and lateral part of the body of the pad in contact with the ridge of the wheel surface that interacts with the side surfaces of the rail, wherein the arcuate body of the pad consists of separate elements, mounted on a steel frame, and the elements that make up the main body of the pad, made of friction material, and the elements that form the lateral part of the body pads are made of anti-friction material in the form of profiled elements being in contact with the ridge of the wheel surface that interacts with the side surfaces of the rail friction material is 1.5-10 times the coefficient of friction and 1.5 to 3.5 greater abrasion resistance than that of anti-friction material, the friction elements forming the main body part pads have different height, the friction elements with greater height are located at the edges of a hundred is inogo frame.

2. Brake wagon composite block according to claim 1, characterized in that the friction elements forming the main and lateral parts of the body pads, which are welded to a metal frame and between a metallurgical method.

3. Brake composite block according to claim 1, characterized in that the friction elements of the main body part pads made of composite friction material, operating at temperatures up to 850C.

4. Brake composite block according to claim 1, characterized in that the friction elements of the main plot pads at least two.

5. Brake composite block according to claim 1, characterized in that the friction elements of the lateral area of the pad is at least two.



 

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