RU213770U1 - FREIGHT CAR BOOT BOOT - Google Patents

Abstract

The utility model relates to railway transport and can be used in the design of bolsters for bogies of freight cars with increased carrying capacity. The bolster contains an upper belt (1), a lower belt (2), side walls (3), pockets (4) for installing friction wedges. Through technological holes (5) are made in the side walls (3). Outer ledges (6) and inner ledges (7) are made along the contour of holes (5). The height of the outer protrusions (6) of the holes (5) is from 2 mm to 15 mm. EFFECT: increased strength of the bolster of the freight car bogie. 4 w.p. f-ly, 7 ill.

Description

The utility model relates to railway transport and can be used in the design of bolsters for bogies of freight cars with increased carrying capacity.

Known bogie bolster railway bogie containing the upper belt with a thrust bearing in the central part, the lower belt with support pads for the springs of the spring set, side walls with technological holes, pockets for installing friction wedges in the end parts, while the technological holes are made extended in the longitudinal direction of the bolster beams and have internal reinforcements along the contour in the form of protrusions-thickenings (see US 3482531 A, publ. 12/09/1969).

Known bogie bogie freight car, containing the upper zone with a thrust bearing, the lower belt containing the support pads of the springs of the spring set, side walls with technological holes containing pockets for friction wedges, while the technological holes of the side walls have reinforcements in the form of rounded protrusions, made according to contour on the outer surface of the side walls (see RU 169160 U1, 03/07/2017).

Known bogie bogie freight wagon high-capacity, containing the upper belt with a thrust bearing in the center, the lower belt with support pads for the elastic elements of the spring set, side walls connecting the upper and lower zones and made with holes, pockets for installing friction wedges in the end parts of the bolster beams, while the holes in the side walls have reinforcements in the form of protrusions-thickenings made along the contour on the outer surface of the side walls (see RU 117129 U1, publ. 20.06.2012). This technical solution is accepted as the closest analogue.

The technical problem of the known bolsters lies in the insufficient strength of the side wall areas weakened by the holes. Reinforcing holes in the form of protrusions on one side of the side walls does not fully solve the problem of ensuring the strength of the structure.

The technical result achieved by using the utility model is to increase the strength of the bolster of a freight car bogie, which increases its operational reliability.

The technical result is achieved due to the fact that the bolster of a freight car bogie, like the closest analogue, contains an upper chord made with a thrust bearing, a lower chord made with bearing surfaces for elastic spring suspension elements, side walls connecting the upper and lower chords and made with holes, pockets for installing friction wedges, while the holes in the side walls have external protrusions made along the contour of the holes on the outer surface of the side walls. The difference of the proposed design is that the holes in the side walls also have internal protrusions made along the contour of the holes on the inner surface of the side walls, while the height of the outer protrusions of the holes in the side walls relative to the outer surface of the side walls is from 2 mm to 15 mm.

In private forms of implementation, the height of the internal protrusions of the holes in the side walls relative to the inner surface of the side walls is from 5 mm to 25 mm; the width of the outer and inner protrusions of the holes in the side walls is from 8 mm to 30 mm; the ratio of the thickness of the side walls to the total value of the height of the outer and inner projections and the thickness of the side walls is from 0.2 to 0.8 with a side wall thickness of 12 mm to 25 mm.

The utility model is illustrated by drawings, which show

in fig. 1 - bolster, general view, axonometric projection;

in fig. 2 - bolster, side view;

in fig. 3 - bolster, top view;

in fig. 4 - section A-A in Fig. 3;

in fig. 5 - section B-B in Fig. four;

in fig. 6 - the result of the calculation for the strength of the bolster structure without internal protrusions of the holes in the side walls;

in fig. 7 - the result of the calculation for the strength of the bolster structure with internal protrusions of the holes in the side walls.

The bolster is a thin-walled box-type structure, which includes an upper belt 1, a lower belt 2, side walls 3 connecting the upper belt 1 and lower belt 2, pockets 4 for installing friction wedges located in the end parts of the bolster.

The upper belt 1 of the bolster is made with a thrust bearing 1.1 in the central part. The lower belt 2 of the bolster is made with bearing surfaces 2.1 for the elastic elements of the spring suspension.

In the side walls 3, through technological holes 5 of oval shape are made, extended in the longitudinal direction of the bolster. Outer protrusions 6 are made along the contour of the holes 5, located on the side of the outer surface of the side walls 3, and internal protrusions 7, located on the side of the inner surface of the side walls 3.

The outer 6 and inner 7 protrusions of the holes 5 have the following geometric dimensions. The height h1 of the outer protrusions 6 is between 2 mm and 15 mm. The height h2 of the inner projections 7 is between 5 mm and 25 mm. The width b of the outer 6 and inner 7 protrusions is from 8 mm to 30 mm. The ratio of the thickness S of the side walls 3 to the total value H of the height h1, h2 and the thickness S is from 0.2 to 0.8 (0.2 S/H≤0.8), while the thickness S of the side walls 3 is in the range from 12 to 25 mm.

When the values of the dimensions h1, h2 and b are less than the lower values of the indicated intervals, as well as when the ratio S/H is more than 0.8, the minimum required level of strength and rigidity of the side walls 3 in the areas of the holes 5 is not achieved. With the values of the dimensions h1, h2 and b more than the upper values of these intervals, as well as with an S/H ratio of less than 0.2, there is a high probability of formation of casting defects in the manufacture of the bolster due to a significant difference between the thickness S of the side walls 3 and the total value H.

When performing strength calculations carried out in accordance with GOST 33211-2014, the von Mises stress distribution fields were obtained in bolster structures without internal protrusions 7 and with internal protrusions 7 holes 5 in the side walls 3 (Fig. 6, 7). Comparison of the results of strength calculations shows that the presence of internal protrusions 7 holes 5 on the inner surface of the side walls 3 reduces mechanical stresses in the centers of formation of stress concentrators located on the end surface of the holes 5 and deep into the side walls 3.

Works bogie bogie freight car as follows.

Through the thrust bearing 1.1 of the upper belt 1, the bolster takes the load from the freight car body. From the bolster, the load through the supporting surfaces 2.1 under the elastic elements of the spring suspension located on the lower chord 2 is transferred to the side frames of the bogie. In this case, part of the transmitted load falls on the side walls 3 connecting the upper 1 and lower 2 belts. The zones of the side walls 3, weakened by the presence of holes 5, in addition to the outer protrusions 6, are also reinforced with internal protrusions 7 along the contour of the holes 5. Thus, an increase in the strength of the bolster of a freight car bogie is achieved, and its operational reliability is increased.

Claims (5)

1. The bolster of a freight car bogie, containing an upper belt made with a thrust bearing, a lower belt made with bearing surfaces for elastic spring suspension elements, side walls connecting the upper and lower belts and made with holes, pockets for installing friction wedges, while the holes in the side walls have external protrusions made along the contour of the holes on the outer surface of the side walls, characterized in that the holes in the side walls have internal protrusions made along the contour of the holes on the inner surface of the side walls, while the height of the outer protrusions of the holes in the side walls is relatively the outer surface of the side walls is from 2 mm to 15 mm. 2. The bolster according to claim 1, characterized in that the height of the inner protrusions of the holes in the side walls relative to the inner surface of the side walls is from 5 mm to 25 mm. 3. Bolster according to claim 1, characterized in that the width of the outer and inner protrusions of the holes in the side walls is from 8 mm to 30 mm. 4. Bolster according to claim 1, characterized in that the ratio of the thickness of the side walls to the total value of the height of the outer and inner protrusions and the thickness of the side walls is from 0.2 to 0.8. 5. Bolster according to claim 1, characterized in that the thickness of the side walls is from 12 mm to 25 mm.

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