RU213983U1 - BOOT BEAM OF A FREIGHT CAR - Google Patents

Abstract

The utility model relates to the field of railway transport and concerns the design of freight car bogies in the part of the bolster beam. The bolster beam of a freight car bogie is made in the form of a steel casting, consisting of an upper chord (1), including an annular thrust bearing plate (2), a lower chord (3) with a central horizontal section (4), inclined sections (5) and support platforms (6) spring set, outer vertical walls (7) connecting the upper (1) and lower (3) chords, inner vertical wall (8) located along the longitudinal axis (9) of the bolster beam. In this case, the inner vertical wall (8) is divided into two walls (10) in the transition zone (11) of the support platform (6) of the spring set into an inclined section (5) of the lower belt (2), which in the upper part go into two ribs (12 ), and in the lower part they end with a smooth transition (13) to the inclined part (5) of the lower belt (3). 10 FIG.

Description

The utility model relates to the field of railway transport in terms of the design of beams for bolsters of freight cars.

Known beam bolster freight car, containing the upper belt with a thrust bearing, bearing platforms for side bearings, a lower belt with inclined sections, with a lower bearing wall and bearing surfaces for accommodating springs of a spring set, bearing side walls connecting the upper and lower belts, the central end walls under support platforms for side bearings connecting the upper and lower chords, and two divergent inner walls (see RU 157798 U1, publication date 12/10/2015).

The closest technical solution to the claimed object is the bolster of a freight car bogie, containing an upper belt with an annular thrust bearing plate, a lower belt with a central horizontal section, with inclined sections and support pads of the spring set, outer walls connecting the upper and lower belts, located along the longitudinal bolster axis of the bolster inner wall connecting the upper and lower chords in the area of the support platform of the spring set and smoothly turning into two inner walls running along the entire length of the beam to its center (see RU 104523 U1, publication date 20.05.2011).

The disadvantage of these designs is that at the point of transition of the inner wall connecting the upper and lower chords in the area of the support platform of the spring set, into the rib running along the upper chord, a mechanical stress concentrator is formed due to a sharp change in stiffness.

The technical result of the utility model is to increase the fatigue strength of the bolster beam.

The claimed technical result of the utility model is achieved due to the improved design of the inner wall located along the longitudinal axis of the bolster beam, connecting the upper and lower chords in the area of the spring set support platform and dividing into two inner walls in the zone of transition of the spring kit support platform to the inclined section of the lower chord, at the same time, two divided inner walls in the upper part pass into two ribs running along the entire length of the upper chord symmetrically relative to the longitudinal axis of the bolster beam to the center of the bearing plate, and in the lower part, the divided two inner walls end in a smooth transition to the inclined section of the lower chord.

The claimed utility model differs from the prototype in that two divided inner walls in the upper part turn into two ribs running along the entire length of the upper belt symmetrically relative to the longitudinal axis of the bolster beam to the center of the thrust plate, and in the lower part they end with a smooth transition to the inclined section of the lower belt , two inner walls and two ribs extending from these walls have a thickness "S1" in the range from 12 to 35 mm, the radius "R1" of the transition in the upper part of the two inner walls into two ribs lies in the range from 20 to 80 mm, two the ribs have wall thickenings "S2" on the length "L1" in the transition zone with a radius "R1", while the thickening "S2" lies in the range from 15 to 40 mm, the length "L1" in the range from 25 to 80 mm, two ribs are spaced from the inner surface of the upper chord by the value "h" in the range from 20 to 100 mm, the smooth transition of the two inner walls into the inclined section of the lower chord is formed by the radius "R2" connected in series with the radius "R3" from top to bottom, while m radius "R2" ranges from 20 to 80 mm, radius "R3" ranges from 80 to 150 mm, distance "b" between two ribs running along the entire length of the upper chord ranges from 40 to 110 mm, the radius of conjugation "R4" of two internal walls separated from each other lies in the range from 20 to 55 mm.

The essence of the utility model is illustrated by drawings, where:

- in Fig. 1 shows a general view of the bolster beam;

- in Fig. 2 shows a front view of the bolster beam;

- in Fig. 3 shows section A-A of the bolster beam in Fig. 2 overlooking the upper belt with ribs;

- in Fig. 4 shows a section B-B of the bolster beam in Fig. 3 with an inside view of the inner wall and ribs of the upper chord of the bolster beam;

- in Fig. 5 shows the remote element B of the bolster in FIG. 3 showing the thickening of the walls of the upper chord;

- in Fig. 6 shows a three-dimensional view from the inside of the bolster beam to the inner wall with the ribs of the upper chord;

- in Fig. 7 shows the results of the calculation, additional design mode (preliminary fatigue assessment) for a structure with one rib with a view of the outer walls;

- in Fig. 8 shows the results of the calculation, additional design mode (preliminary fatigue assessment) for a structure with two ribs with a view of the outer walls;

- in Fig. 9 shows the results of the calculation, additional design mode (preliminary fatigue assessment) for a structure with a single rib with a view of the upper chord;

- in Fig. 10 shows the results of the calculation, additional design mode (preliminary fatigue assessment) for a structure with two ribs with a view of the upper chord.

The bolster beam of a freight car bogie (Fig. 1) is made in the form of a steel casting and consists of an upper belt 1, which includes an annular thrust plate 2, a lower belt 3 with a central section 4 (Fig. 2), inclined sections 5 and support platforms 6 spring set, outer walls 7 connecting the upper 1 and lower 3 belts, the inner wall 8 (Fig. 4), located along the longitudinal axis 9 of the bolster beam (Fig. 3), connecting the upper 1 and lower 3 belt in the area of each support platform 6 spring kit.

The inner wall 8 (Fig. 4) is divided into two inner walls 10 (Fig. 5) in the transition zone 11 of the support platform 6 of the spring set into the inclined section 5 of the lower belt 2 (Fig. 4), with two inner walls 10 in the upper part pass into two ribs 12 running along the entire length of the upper belt 1 symmetrically relative to the longitudinal axis 9 of the bolster beam to the center of the thrust bearing plate 2, and in the lower part end with a smooth transition 13 into the inclined section 5 of the lower belt 3 (Fig. 4).

The ribs 12 (FIG. 3) and the inner walls 10 have a thickness "S1" ranging from 12 to 35 mm. The radius "R1" (Fig. 4) of the transition in the upper part of the two inner walls 10 into two ribs 12 lies in the range from 20 to 80 mm. The ribs 12 (Fig. 5) have thickenings 14 of the walls up to the value "S2" on the length "L1" in the zone of the radial transition "R1" (Fig. 4) of the two inner walls 10 into the ribs 12, while the thickening "S2" lies in the range from 15 to 40 mm, length "L1" - from 25 to 80 mm. The lower ends of the ribs 12 (Fig. 4) are separated from the inner surface of the upper belt 1 by the value "h" in the range from 20 to 100 mm. A smooth transition 13 of the inner walls 10 into the inclined section 5 of the lower belt 3 is formed by the radius "R2" connected in series with the radius "R3" from top to bottom, while the values of the radii lie in the ranges: "R2" - from 20 to 80 mm, "R3" – from 80 to 150 mm. The distance "b" between two ribs 12 (Fig. 5, 6) lies in the range from 40 to 110 mm. The junction radius "R4" (Fig. 5) of the inner walls 10 in the zone of transition to the ribs 12 lies in the range from 20 to 55 mm.

The value of the dimensions "h", "L", "R1", "R2", "R3", "S1", "S2" less than the specified ranges does not lead to a significant increase in the strength of the upper chord 1 of the bolster beam, and also does not lead to a significant reduction of stress concentration in the transition zone with a radius "R1" of the inner walls 10 into the ribs 12. Exceeding the specified size ranges "h", "L", "R1", "R2", "R3", "S1", "S2" leads to excess strength and rigidity of the bolster beam.

The indicated size ranges "b" and "R4" are due to the choice of a uniform spacing of the ribs 12 on the upper chord 1, which ensures the strength of the upper chord 1.

The results of the calculation of the strength of the bolster beam according to GOST 33211 “Freight cars. Requirements for strength and dynamic qualities”, according to which an additional design mode (preliminary fatigue assessment) is considered, are shown in Fig. 7 - 10.

The application of the proposed utility model makes it possible to produce a rational design of the bolster beam with increased fatigue strength by reducing the concentration of mechanical stresses in the transition zones of the inner walls into the ribs of the upper chord, as well as on the upper chord of the bolster beam.

The proposed utility model is used as follows.

The load from the car body through the center plate is transferred to the center plate of the bolster bogie beam and then through the spring set to the support pads of the side frame spring sets. The proposed design of the inner wall of the bolster beam, located along the longitudinal axis of the bolster beam and connecting the upper and lower chords in the area of the support platform of the spring set, helps to reduce the magnitude of mechanical stresses in the transition zone of the inner wall into the ribs of the upper chord, as well as on the upper chord of the bolster beam.

Claims (1)

Bolster beam, containing an upper chord with an annular thrust bearing plate, a lower chord with a central horizontal section, with inclined sections and support platforms of the spring set, outer walls connecting the upper and lower chords, an inner wall located along the longitudinal axis of the bolster beam, connecting the upper and lower chords in the area of the support platform of the spring set and dividing into two inner walls in the zone of transition of the support platform of the spring set to the inclined section of the lower belt, characterized in that the two divided inner walls in the upper part pass into two ribs running along the entire length of the upper belt symmetrically with respect to the longitudinal the axis of the bolster beam to the center of the thrust plate, and in the lower part end with a smooth transition to the inclined section of the lower chord, two inner walls and two ribs emerging from these walls have a thickness S1 in the range from 12 to 35 mm, a radius R1 of the transition in the upper part two inner walls into two the ribs are in the range from 20 to 80 mm, two ribs have wall thickenings S2 along the length L1 in the transition zone with a radius R1, while the thickening S2 lies in the range from 15 to 40 mm, the length L1 is in the range from 25 to 80 mm, two ribs are separated from the inner surface of the upper chord by a value h in the range from 20 to 100 mm, the smooth transition of the two inner walls into the inclined section of the lower chord is formed by radius R2 connected in series with the radius R3 from top to bottom, while the radius R2 lies in the range from 20 to 80 mm, radius R3 in the range from 80 to 150 mm, the distance b between two ribs running along the entire length of the upper chord is in the range from 40 to 110 mm, the radius of mating R4 of two divided inner walls with each other lies in the range from 20 to 55 mm.

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