Car brake shoe with composite inserts

FIELD: transport.

SUBSTANCE: brake shoe comprises steel carcass and iron arched body furnished with grouped inserts. Insert abrasivity exceeds that of shoe body material. Said inserts are welded in place while the entire set is cast-in with iron to make integral working surface of the shoe. Said shoe has an extra metal carcass. Extra metal carcass incorporates inserts of the shoe body main section made of composite friction material, its friction factor exceeding that of the body, and lateral inserts composed of shaped elements in contact with locomotive tire flange surface interacting with rail side surface. Inserts are made of antifriction material with friction factor lower than that of the base and abrasiveness lower than that of the base and inserts fitted in pad body main section.

EFFECT: more efficient braking, lower noise and wear, increased MTBR, reliable and stable operation of brake systems.

5 cl, 4 dwg

 

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

Known brake pad on Avtv 1572889, B61H 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.

Known brake pad containing a steel frame and cast-iron arched body, consisting of a main and profile plots. 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 in rows, at least two of the GRU is p inserts a cylindrical shape. 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 B61H 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 of the inserts is reduced coefficient of friction, which contributes to further wear of friction pairs. Block creates noise during operation. The block has no lubricating effect of the wheel tread and rail track.

The objective of the proposed technical solution is to improve the braking performance of the train cars, the improvement of the ecological situation in the area of the braking train, lower operating costs, maintenance manual steam railway cars and railway tracks.

In the process of solving the task is achieved technical result, which was to reduce the level of noise pollution in the process of braking, reduce wear of the wheel flange and the side surface of the rail, increase time between maintenance wheelset, reducing the consumption of brake pads, improving stability and reliability fu is klonirovania brake systems.

The technical result is achieved wagon brake Shoe with composite inserts containing steel frame, cast-iron arched body, provided with inserts placed groups, the abrasiveness of the material of the inserts is greater than the abrasiveness of the material body pads, inserts secured by welding, and the entire set is filled with iron to form a unified working surface of the pad, and the pad has an additional metal frame, which is fixed to the insertion of the main body part pads, made of composite friction material, and a coefficient of friction higher than the coefficient of friction of the base, and side grips, made 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, while the side panels are made of anti-friction composite material with a coefficient of friction lower than the coefficient of friction of the base material and the abrasive lower abrasiveness of the substrate material and the material of the inserts of the main body part pads. In addition, an additional metal frame, which is fixed to the friction and anti-friction insert, fixed by welding on a steel frame, frictional insertion of the main body part pads made of composite friction material, the work is non at temperatures up to 800C, the total area of the friction surface of the friction cylindrical inserts of the main body part of the pad is 60-95% of the working surface of the main site pads, the total surface area of the anti-friction lateral inserts is at least 80% of the lateral surface of the last main section of the pad in contact with the ridge of the wheel surface that interacts with the side surfaces of the rail.

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 of the proposed technical solutions were studies wheelset locomotive that worked 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 is to be followed by delamination (separation) of the particle. 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 the cracks is a significant part of reaching 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 wheel rim and has a high coefficient of friction. We offer brake pad has a metal frame, which is fixed to the cylindrical insert main body part pads, made of composite friction material, and a coefficient of friction higher than the coefficient of friction fundamentals, such performance pads allows you to clean the surface of the wheel. Regular cleansing wheelset from dirt and odourisation in the braking process leads to increase time between maintenance 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 most of the contact surface system "brake pad wheel falls on the inserts of composition, because this will reduce noise pollution in the braking process.

The second surface of the wheel subjected to intensive wear of the surface ridge. Particularly the wear of this surface occurs when driving 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. That was such a process, the proposed technical solution, side grips, pads, made in the form of a flat

items that are in contact with the ridge of the wheel surface that interacts with the side surfaces of the rail, made of anti-friction composite material with a coefficient of friction lower than the coefficient of friction of the base material of the profile plot and have low abrasion resistance. In the process of braking every time will be the contact anti-friction material to the surface of the wheel flange. P is because the abrasion resistance of the inserts below the abrasion resistance of the material of the wheel rail, it will be a transfer of anti-friction material on the surface of the wheel flange, and later, when driving in curves, wear will be reduced crest rail.

The proposed solution is illustrated by drawings, where figure 2 presents a General view of the pad from the top in figure 3 - view And figure 2, the surface of the pads, interacting with the ridge surface of the wheel, figure 4 shows a section along the section b-B figure 2.

Brake wagon Shoe with composite inserts contains a steel frame 1, cast iron arched body 2 consisting of a main body part 2.1 pads with inserts 3, the abrasiveness of the material of the inserts is greater than the abrasiveness of the material body pads, specialized body part pads 2.2, provided with inserts 4, the insert 3 and 4 are fixed by welding, and the entire set is filled with iron to form a unified working surface of the pad. The block has an additional metal frame 5, which is fixed to the cylindrical insert 3 of the main body part 2.1 pads, made of a composite friction material with a coefficient of friction higher than the coefficient of friction of the base, and the side of the insertion section 2.2, made in the form of core inserts 4 in contact with the ridge of the wheel surface that interacts with the side surface of the rail, ridge surface of the wheel h is shown). Insert 4 is made of anti-friction composite material with a coefficient of friction lower than the coefficient of friction of the base material side of the site and abrasiveness lower abrasiveness of the material body pads 2 and the material of the inserts 3, placed in the main body of the pad 2.1. Additional metal frame 5, which is fixed to the friction of the insert 3 of the main body part of the pad 2.1. Friction insert 3 of the main body part 2.1 pads made of composite friction material, operating at temperatures up to 800C.

The abrasive material of any insertion of the main body part pads may exceed the abrasiveness of the material body pads. The preferred excess of the abrasiveness of the material of the inserts is not less than 1.2-1.5 times. The abrasive material of any ridge inserts made of antifriction material, installed in the Creek core area of the body pads, may be less than the abrasiveness of the material body pads preferably not less than 2 times.

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

The possibility of producing, using different materials and manufacturing techniques inserts can improve their quality and to vary the resulting technical indicators pads depending on the requirements of specific conditions in a particular section of road, terrain and climatic conditions.

1. Brake wagon Shoe with composite inserts containing steel frame, cast-iron arched body, provided with inserts which are placed groups, the abrasiveness of the material of the inserts is greater than the abrasiveness of the material body pads, inserts secured by welding, and the entire set is filled with iron to form a unified working surface of the pad, wherein the pad has an additional metal frame, which is fixed to the insertion of the main body part pads, made of composite friction material, and a coefficient of friction higher than the coefficient of friction of the base, and side grips, made in the form of profiled elements being in contact with the ridge surface of the wheel tread, interactive with the side surfaces of the rail, the side stawk is made of anti-friction composite material with a coefficient of friction lower than the coefficient of friction of the base material and the abrasive lower abrasiveness of the substrate material and the material of the inserts of the main body part pads

2. Brake pad according to claim 1, wherein the additional metal frame, which is fixed to the friction and anti-friction insert, fixed by welding on a steel frame.

3. Brake pad according to claim 1, characterized in that the friction of the insert main body part pads made of composite friction material, operating at temperatures up to 800C.

4. Brake pad according to claim 1, characterized in that the total area of the friction surface of the friction cylindrical inserts of the main body part of the pad is 60-95% of the working surface of the main site pads.

5. Brake pad according to claim 1, characterized in that the total surface area of the anti-friction lateral inserts is at least 80% of the lateral surface of the last main section of the pad in contact with the ridge of the wheel surface that interacts with the side surfaces of the rail.



 

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