RU2691903C1 - Bolster beam - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to railway transport, particularly, to bogie bolster beams. Bolster comprises upper and lower belts, side walls and inner ribs. Ribs are located between upper and lower belts. In the central part of the ribs there are two openings separated by bridges. In central part of side walls there is one window.

EFFECT: reduced metal consumption of the bolster.

4 cl, 2 dwg

Description

The invention relates to the field of railway transport and relates to the design of the bolster bogie railway carts.

Known invention according to the patent of the Russian Federation No. 2621515 "Frame sidewall and bolster for a railway truck, as well as the method of their manufacture" (priority date: 05/17/2011, publication date: 06/06/2017). FIG. 9B of this analogue is represented the nadressor beam containing upper and lower belts, side walls and internal ribs located between the upper and lower belts, while in the middle part of the side walls and internal ribs two windows for the brake are made, separated by bridges.

The BarberS2HD-9C trolley from VabTecCorporation (USA) was selected as a prototype: [website] URL: https://www.wabtec.com/products/1262/barber%C2%AE-side-frame-and -bolster-castings (circulation date 06/19/2017), containing a bolster, with each symmetrical longitudinal side with two holes for the brake system. These holes are separated by a vertical jumper.

The disadvantages of the bolster under patent No. 2621515 and the prototype are their lack of reliability, durability, and increased metal content.

The technical result provided by the invention is to increase the strength, reliability of the bolster bolster while reducing its metal content.

The technical result is achieved due to the fact that the bolster beam contains upper and lower belts, side walls and internal edges located between the upper and lower belts, in the central part of the inner edges are made of two windows separated by bridges, while in the central part of the side walls on one window.

The height of the central part of the bolster beam can be from 450 to 550 mm.

The windows in the central part of the side walls of the bolster are 400-480 mm wide and 250-300 mm high.

The windows in the central part of the internal ribs are 150-200 mm wide and 250-300 mm high.

The durability and reliability of the bolster beam is ensured by the fact that in the central part of each side wall there is one window for elements of the brake system. The absence of a bridge between the windows in the side walls of the beam avoids a sharp change in stiffness along the side walls and leads to a decrease in stresses on the edges of the windows. As a result of stress reduction in the corners of windows for elements of the brake system, the strength and reliability of the beam as a whole is ensured. In addition, the exclusion of the jumper between the windows in the central part of each side wall reduces the metal intensity of the bolster beam.

The dimensions of the windows, made in the side walls and internal edges, are determined by the dimensions of the braking system elements, passed through the windows, and the size of the displacements of these elements relative to the bolster during operation of the railway bogie. Therefore, the claimed technical solution for the expert is not obvious from the prior art.

The claimed technical solution is presented in the figures.

FIG. 1 - nadressorny beam on which are designated:

1 - upper belt;

2 - lower belt;

3 - side walls;

4 - internal edges;

5 - side wall windows for elements of the brake system;

6 - windows of internal edges for elements of the brake system;

7 - technological holes;

8 - podatnikovy place;

9 - supporting sites for side bearings;

10 - pockets for installing wedges.

2 is a diagram of the distribution of equivalent voltages of a nressress von according to Mises.

Figure 1 shows the bolster beam, containing the upper belt 1 and the lower belt 2, two side walls 3 and the inner ribs 4, located between the upper 1 and lower 2 belts. In the central part of each side wall 3, a window 5 is made for elements of the braking system, the width of which is 400-480 mm, height 250-300 mm. These dimensions of the window 5 make it possible to obtain a passage through passage for free passage through the central part of the bolster bolster of the car’s braking mechanism while ensuring the necessary rigidity and strength of the bolster bolster during its operation as part of a railway bogie.

To provide the necessary strength and stiffness of the bolster beam, the height of the central part of the bolster beam ranges from 450 to 550 mm.

The nadressorny beam contains in the internal ribs 4 two windows 6 each with a width of 150–200 mm and a height of 250–300 mm, which provide access to the brake system elements through the air bolster. Vertical jumpers between the windows 6 (position not shown) made a width of 80-100 mm

Nadressorny beam may contain internal edges 4 with windows 6, having flared (not shown), protruding from one side of the window 6, 15-30 mm wide, 22-50 mm thick. Flanging creates a local gain windows 6, which are stress concentrators.

On the beam (Fig. 1), technological holes 7 can be additionally made. The upper belt 1 of the beam includes a thrust spot 8 and support platforms 9 for side bearings. In addition, the beam contains pockets 10 for installing wedges.

The achievement of the technical result is confirmed by the simulation results. Simulation of the load distribution on the overpressure beam for the preliminary assessment of the fatigue resistance of the supporting structure according to GOST 32211 “Freight wagons. Requirements for strength and dynamic qualities ”confirmed that the presence of one window 5 for elements of the braking system (brake equipment) in each side wall 3, made in the center, provides greater strength and reliability of the beam compared to the strength of the beam with two windows formed by a jumper in center beam.

The simulation was carried out in the software package "EN X Nastran" ("NX Nastran").

In the simulation it was assumed that the bolster beam was made by casting from steel with the following characteristics: elastic modulus = 2.1 * 10 ⁵ MPa, Poisson's ratio = 0.3

The strength calculation of the bolster beam with one window 5 in the central part of each side wall 3 (beam without lintel) and the bolster beam with the same accepted characteristics, but with two windows in each side wall (beam with jumper) is made. The results of the calculation of the distribution of equivalent von Mises stress are presented in the table.

Table

Stress Distribution Calculation Results

Point stress, MPa a b c d e f g h Beam without lintel 115 103 91 82 114 103 91 82 Lintel 133 104 91 94 133 103 90 94

The table shows the voltage values at the points marked in FIG. 2. The table shows that the calculated data at points a, b, c, d (to the left of the center of the side wall) almost coincide with the data at points e, f, g, h (to the right of the center of the side wall), respectively. Thus, the distribution of stresses arising from the right side of window 5 is symmetrical to the stresses arising from the left side of this window.

As can be seen from the results of the calculations given in the table, at points d and e, the voltage is significantly less in the claimed technical solution (beam without jumper) compared with the prototype (beam with jumper). As a result of the analysis of the stress-strain state of the von Mises, the presence of a local zone (jumper) with an increased stress level was revealed. By combining two windows for brake system elements in the central part of each side wall 3 into one window and eliminating the stiffness element (bridge) between them, which is a stress concentrator, increases the reliability and strength of the beam.

Thus, the claimed design of the bolster bolster provides reliable and long-term operation at high dynamic loads and cyclic loading. The application materials disclose the mechanism for achieving the technical result provided by the invention. This disclosure is not known from the prior art, therefore, the claimed invention meets the condition of inventive step.

Claims (4)

1. A nadressorny beam containing upper and lower belts, side walls and internal ribs located between the upper and lower belts, while in the central part of the inner ribs two windows are made separated by bridges, characterized in that in the central part of each side wall one window. 2. Nadressorny beam according to claim 1, characterized in that it is made in the central part with a height of 450-550 mm. 3. The nadressorny beam according to claim 1, characterized in that the windows in the central part of the side walls are 400-480 mm wide and 250-300 mm high. 4. Nadressorny beam according to claim 1, characterized in that the windows in the central part of the inner ribs are made with a width of 150-200 mm and a height of 250-300 mm.

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