Rail vehicle brake shoe

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

 

The invention relates to brake devices, namely to the brake pads railway rolling stock.

The famous cast-iron brake rail pads, including with a metal frame, manufactured according to GOST 1205-73.

These pads have a positive impact on the surface of the rolling wheel, but they do not provide a high coefficient of friction, have insufficient wear resistance, are large (up to 16 kg) weight, require more effort pressing lever transmission during braking, do not provide silent and smooth braking of the train.

Known brake Shoe for railway vehicles, comprising a composite friction element (Baserev, the Production of brake pads made of composite materials for railroad cars. M.: Chemistry, 1982, p.9).

The essential features of similar polymer composite friction element coincide with the essential features of the invention.

The disadvantage of the above-mentioned brake pads is reduced brake efficiency when water is present in the friction zone in bad weather conditions and increased icing in the periodic heating during braking and subsequent cooling to ambient temperature when operating in cold climates. The result is e icing impair its performance pads up to the impossibility to carry out braking with significant icing.

The analogue of the claimed pads is also a brake pad containing a pair of solid inserts on the friction part, symmetrical about the horizontal axis of the pad and overlying its frictional portion across the width (A.S. USSR 159186 (IPC B61h, 1963).

The material of the inserts increases the efficiency of interaction of the pads with the wheel rim when water is present in the friction zone (rain, snow). Known deficiencies: insert retained in the composite friction material due to the friction and adhesion between the contacting between the surfaces of the inserts and of the friction material and are manufactured by preformative composite friction material at elevated temperature and pressure to a solid inserts in special molds. The design of these pads do not provide the required reliability, as with long-term and emergency braking is an intensive heat transfer from the zone of friction on the surface of solid inserts is fading and melting of composite material surrounding the insert, and therefore the mounting of these inserts is waning, and they fail to fulfill its purpose until the fall of solid inserts of the pads.

The closest analogue is the block containing as metallicheskaya wire frame, and the friction part of the pad is fixed to the frame of the three elements along the length of the pads and overlying the entire area of the cross section of the wear layer pads. One solid insert is located in the Central part of the pad, provided with a hole for the pin, and its wear layer is made of cast iron. Two inserts made of composite friction material and are located on both edges of a rigid insert (U.S. Pat. RU # 2188347 C1, 7 F16D 65/06, B61H 1/00, 15.05.2001).

The disadvantage of this block is the existence of a region of intersection between the solid plug from the metal in the Central part of the pad and composite friction part, across the surface of contact with the wheel rim. When heating the metal when braking possible delamination of the composite part pads.

The essential features most similar analogue "solid insert overlying the strip across its width and composite friction part are shared with the essential features of the claimed pads.

The challenge which seeks inventive brake pad, is to increase the service life of the wheels by saving the running surface of the wheels by reducing the appearance of it and repair thermal crack, floaters, and a fat, caused by the use of a composition of the mother of the crystals, increase brake efficiency pads in contact with water or ice in the friction zone, the surface increasing heat dissipation from the specified location, improving structural safety shoes when operating in cold climates, and using frequent braking cycles.

To achieve the technical result in brake Shoe for railway vehicles, comprising a metal wire frame with celnikom and with a hole for the pin in the Central ledge pads, friction part with hard inserts, used paste mainly made of metal, made in the form of a rectangle in the longitudinal cross-section with side walls along the entire length of the pad and at least two ridges on each side of the Central protrusion of the pad containing the locking sampling under the valve frame, and composite friction element is located inside the insert.

In addition, the pad may be rectangular solid inserts and jumpers in the shape other than rectangular, for example, in the form of a-line with short edge near Telnice, and their height does not exceed the maximum allowable wear.

In addition, the block may be solid inserts that are located either in the Central part of the pad and on the sides, or only on the edges or in the and with the walls in the form of a rectangle, located on both sides of the Central protrusion pads, and two inserts made of composite friction material, located either in front of a solid insert, either between or within.

The essential features of the claimed invention "insert, primarily from metal, made in the plan in the form of a rectangle in the longitudinal cross-section with side walls along the entire length of the pad and at least two ridges on each side of the Central protrusion of the pad containing the locking sampling under the valve frame, and composite friction element is located inside the insert, are different from the characteristics of the prototype.

Be made Shoe can known methods.

Figure 1 shows the block, General view; figure 2 presents the incision pads vertically and horizontally and insert tabs; figure 3 shows a section of the pad along the longitudinal section inserts on the edges and in the middle, and a top view, figure 4 shows a cut pads pad with inserts on the edges; figure 5 - section pads with rectangular inserts.

Brake pad made in the form of arcuate rectangular beam 1 and the Central protrusion or tide 2 in the middle part, a hole 3 for fastening the pin, and the entire side surface is a solid insert 4, which is made to direct the coal forms and with the ridges 5. On the jumpers in the respective grooves is located a valve metal frame 6.

Figure 2 presents a view of this block in two planes and solid insert jumpers in the rectangular version. Jumpers can be other than the rectangular shape, such as trapezoidal, as well as periodic profile along the length. Composite friction part or the insert 7 is located within the area bounded by a solid box 4. Telnic not shown.

Figure 3 presents the implementation of the pads, when solid inserts are only at the edges. Composite friction element 7 is located between them.

4 shows an embodiment of the pad with solid inserts that are located in the middle 8 and the edges 9. At this time, the valve metal frame 6 can enter the body at a solid insert.

Figure 5 presents an embodiment of the pad when extreme insert 9 is connected with the middle of the outer side surface and form two rectangular solid insert, United Central tab 2.

The block operates as follows.

When the pressing of the friction surfaces of the pads to the wheel surface of the rim Catania contact during friction with inserts. Solid inserts cover a large part of the friction surface across to the boat, therefore, the probability of catching the bully box across the width of the pad increases. This leads to less wear basics pads, increases service life in operation. In the presence of water or solid ice box when braking rips and melts the ice at the beginning of the braking, and then the bulk of the load in this case is a composite part, and the metal serves to increase the heat transfer from the composite into the environment.

A specific example of the fabrication is a railway brake pad of a composite material containing a solid insert, obtained, for example, by casting or stamping. Tylenol pads includes a metal frame, which can be performed, for example, in the form of two closed frames, for example, from a wire, the inner part which are mutually overlapped and bent out the rear of the pads, forming an eyelet for passing the checks. Frame is embedded in a solid box and further in friction polymeric material in the molding process of the pad in the mold. Tylenol may also contain sheet material, such as perforated sheet metal, metal mesh, etc. placed on the outside of the frame, which is also shrinked in polymer friction material. The composite is made by mixing a binder, fillers (for example, rubber mixer), molded the eat of the product (if necessary with a metal frame), for example in the mold, and further thermal and mechanical processing.

The use of polymer composite with solid inserts can improve heat transfer during heating pads in the process of frictional contact with the braking and subsequent abrupt cooling under the influence of external conditions.

1. Brake pad railway rolling stock comprising a metal wire frame with celnikom and with a hole for the pin in the Central ledge pads, friction part with hard inserts, wherein the inserts, mostly from metal, made in the form of a rectangle in the longitudinal cross-section with side walls along the entire length of the pad and at least two ridges on each side of the Central protrusion of the pad containing the locking sampling under the valve frame, and composite friction element is located inside the insert.

2. Brake pad railway rolling stock according to claim 1, characterized in that the rectangular solid inserts and jumpers in the shape other than rectangular, for example, in the form of a-line with short edge near Telnice and with a height not exceeding the value of the maximum permissible wear.

3. Brake pad railway rolling stock according to claim 1, characterized in that it is solid in Tawke, located either in the Central part of the pad and on the sides, or only on the edges, or made with walls in the form of a rectangle, located on both sides of the Central protrusion pads, and two inserts made of composite friction material, located either in front of a solid insert, either between or within.



 

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