RU2714335C1 - Freight car bogie cast side frame - Google Patents

Abstract

FIELD: transportation.

SUBSTANCE: invention relates to railway transport, namely, to design of side frames of three-element trolleys. Frame comprises central spring opening, top, bottom and two inclined belts and two vertical columns. Inner ribs in inclined belts and ledges on outer side of frame adjoin radius transitions made in lower corners of opening. Every lower opening angle contains two radius transitions. Upper transition is made with deepening into vertical column and is conjugated with inclined belt at tangent. Lower transition matches the inclined belt with the support platform.

EFFECT: increase in the reliability of the solebar is achieved.

3 cl, 5 dwg

Description

The invention relates to railway rolling stock, in particular to the construction of a cast side frame of a freight car truck.

There are various designs of cast side frames of freight wagon trolleys (RU 2323843 C1, B61F 5/52, 05/10/2008; UA 8939 U, B61F 5/52, 08/15/2005; US 5546869, B61F 5/52, 08/20/1996; US 6543367 B1, B61F 3/00, 04/08/2003), which contain a symmetrical central spring opening: the upper horizontal zone of a closed section with consoles forming axle openings; closed horizontal lower belt with a support pad for spring kit; two vertical columns and two inclined zones connecting the upper and lower horizontal zones; Radial transitions to the reference platform in the lower corners of the spring opening; technological windows between the upper belt, vertical columns and inclined belts.

To reduce stresses during transmission of operational loads in the zones of radial transitions from the support platform to the vertical columns and inclined belts, internal stiffening ribs located in inclined belts are provided. Analysis of the stress state of these structures shows the presence of a voltage jump in the radial transitions and indicates insufficient frame strength in these zones and the lower parts of the process windows, which reduces the reliability of the structure. The reason for the low strength of such frames is casting defects: loosening, shrinkage shells and other casting defects resulting from the formation of thermal units in these zones that concentrate these defects.

In the known side frame, an attempt has been made to increase the reliability and safety factor of fatigue resistance by forming protrusions at the radial transitions from the support platform to the vertical columns in the convergence zone of the outer ribs. The protrusions combine the outer ribs, mate with their side surfaces and create conditions for directional crystallization (see patent RU 2294855 C1, B61F 5/52, 03/10/2007 - adopted as a prototype).

The disadvantage of the design is its unsatisfactory static and fatigue strength, which leads to failure in operation and reduce the service life of the side frame.

The technical result, the solution of which the invention is directed, is to increase the reliability of the side frame, static and fatigue strength in the areas of the lower corners of its central spring opening.

The specified technical result is achieved by the fact that in the molded side frame, which includes symmetrically framing its spring opening: the upper horizontal belt of closed section with consoles forming axle openings, the lower belt of closed section with the supporting platform for the spring set, two vertical columns and two inclined belts, connecting the upper and lower zones, radius transitions to the supporting platform in the lower corners of the spring opening, technological windows in the walls of the side frame between the upper belt, vertical column mi and side belts, inner ribs in inclined belts adjacent to radius transitions, protrusions on the outside of the side frame in zones of radius transitions, outer ribs adjacent to protrusions, each lower corner of the spring opening contains two radius transitions, the upper of which is made with a recess into a vertical column and mates tangentially with an inclined belt, and the lower one - tangentially mates an inclined belt with a support platform. Two external ribs adjoin each protrusion, one of which is a continuation of the external inclined edging of the technological window, and the other is a continuation of the reference platform.

Comparison of the proposed technical solution with the given analogues and prototype allowed us to establish the presence of distinctive features, therefore, this technical solution meets the criterion of "novelty."

The essence of the invention is illustrated by drawings, where

in FIG. 1 shows a general view of a cast side frame,

in FIG. 2 - remote element A in FIG. 1,

in FIG. 3 - section BB in FIG. 1,

in FIG. 4 is a section BB of FIG. 3

in FIG. 5 is a section GG in FIG. 3

The molded side frame contains symmetrically framing its central spring opening 1 elements: upper horizontal belt 2 of closed section with consoles 3 forming axle openings 4, lower horizontal belt 5 of closed section with supporting platform 6 for spring set, two vertical columns 7 and two inclined belts 8, connecting the upper 2 and lower 5 horizontal belts, technological windows 9 between the upper horizontal belt 2, vertical columns 7 and inclined belts 8.

в вертикальную колонку 7 и сопрягается по касательной с наклонным поясом 8, а нижний R₂ - сопрягает по касательной наклонный пояс 8 с опорной площадкой 6. К радиусному переходу R₁ примыкает внутреннее ребро 10 наклонного пояса 8, сопрягаемое с внутренними окантовками 11 технологического окна 9. В ребре 10 выполнено технологическое отверстие 12. Выступ 13 с наружной стороны боковой рамы в зоне примыкания к радиусным переходам R₁ и R₂ выполнен в виде сегмента и плавно переходит в наружные ребра 14 и 15, первое из которых является продолжением наружной наклонной окантовки 16 технологического окна 9, а второе - продолжением опорной площадки 6. Значения радиусов верхнего и нижнего радиусных переходов составляют 50…55 мм и 30…40 мм соответственно, а углубление верхнего радиусного перехода в вертикальную колонку - 0,9…1,1 от значения радиуса этого перехода.Each lower corner of the Central spring opening 1 contains two radius transitions, the upper R ₁ of which is made with a recess

a vertical column 7 and mates with the inclined tangential belt 8, while the lower R ₂ - matches tangentially inclined belt 8 with the support plate 6. By the transition radius R ₁ abuts the inner edge 10 of the inclined belt 8, matched to the internal edging process window 11 9 A technological hole 12 is made in the rib 10. The protrusion 13 on the outer side of the side frame in the zone adjacent to the radial transitions R ₁ and R _{2 is} made in the form of a segment and smoothly passes into the outer ribs 14 and 15, the first of which is a continuation of the outer pubic border 16 of the technological window 9, and the second - the continuation of the reference pad 6. The radii of the upper and lower radius transitions are 50 ... 55 mm and 30 ... 40 mm, respectively, and the recess of the upper radius transition to the vertical column is 0.9 ... 1.1 from the value of the radius of this transition.

The achieved technical result consists in providing conditions for directional crystallization, eliminating shrinkage porosity, shells, loosening and cracking in the side frame, as well as reducing stress concentration, increasing static and fatigue strength in the lower part of the central spring opening 1 and the reliability of the side frame as a whole.

Theoretical studies of the inventive cast side frame showed that the values of the safety factor of fatigue resistance in the lower corners of the spring aperture related to the extreme zones is at least 2.8, which will contribute to its trouble-free operation for the entire designated service life.

Currently, an experimental batch of side frames is being manufactured using the proposed technical solution, which will be tested in accordance with established standards.

Claims (3)

1. A molded side frame of a freight wagon trolley containing elements symmetrically framing its central spring opening: upper horizontal belt of closed section with consoles forming axle openings, lower horizontal belt of closed section with supporting platform for spring set, two vertical columns and two inclined belts, connecting the upper and lower horizontal zones, radial transitions in the lower corners of the spring opening, technological windows between the upper horizontal belt, vertical columns and inclined belts, inner ribs in inclined belts adjacent to the radial transitions, protrusions on the outside of the side frame in the zone of radius transitions, and external ribs adjacent to the protrusions, characterized in that each lower corner of the spring opening contains two radius transitions, the upper of which it is made with a recess in a vertical column and is mated tangentially with an inclined belt, and the lower one is tangentially mated with an inclined belt with a support platform. 2. Cast side frame according to claim 1, characterized in that the radii of the upper and lower radius transitions are 50 ... 55 mm and 30 ... 40 mm, respectively, and the recess of the upper radius transition into the vertical column is 0.9 ... 1.1 from radius values of this transition. 3. A molded side frame according to claim 1, characterized in that two external ribs adjoin each protrusion, one of which is a continuation of the external inclined edging of the technological window, and the other is a continuation of the supporting platform.

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