EP4368775A1 - Federstabförmiger clip-befestiger zur schienenbefestigung - Google Patents

Federstabförmiger clip-befestiger zur schienenbefestigung Download PDF

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Publication number
EP4368775A1
EP4368775A1 EP23020340.8A EP23020340A EP4368775A1 EP 4368775 A1 EP4368775 A1 EP 4368775A1 EP 23020340 A EP23020340 A EP 23020340A EP 4368775 A1 EP4368775 A1 EP 4368775A1
Authority
EP
European Patent Office
Prior art keywords
rail
sections
resting
clip
horizontal plane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23020340.8A
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English (en)
French (fr)
Inventor
Sergei Vladimirovich Belov
Vadim Olegovich Berezin
Dmitrii Vladimirovich Buzlaev
Kirill Andreevich Doroshenko
Andrei Aleksandrovich Efimov
Eldar Danilovich Zagitov
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Russian Railways JSC
Original Assignee
Russian Railways JSC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Russian Railways JSC filed Critical Russian Railways JSC
Publication of EP4368775A1 publication Critical patent/EP4368775A1/de
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B9/00—Fastening rails on sleepers, or the like
    • E01B9/02—Fastening rails, tie-plates, or chairs directly on sleepers or foundations; Means therefor
    • E01B9/28—Fastening on wooden or concrete sleepers or on masonry with clamp members
    • E01B9/30—Fastening on wooden or concrete sleepers or on masonry with clamp members by resilient steel clips
    • E01B9/303—Fastening on wooden or concrete sleepers or on masonry with clamp members by resilient steel clips the clip being a shaped bar

Definitions

  • the invention relates to a design of a track structure for railways, namely to a design of a spring rod-shaped clip fastener for a use in intermediate rail fastenings for pressing a rail against a rail support.
  • the clip fastener should provide a force sufficient for pressing a rail against a rail support.
  • the RU 2767807 C1 information source of 22.03.2022 (an analogous solution) is known in the art, wherein a structure of a clip fastener for rail fastening is disclosed; the structure is made of a resilient rod bent to form a rectilinear on-rail section smoothly changing first into side lengthy sections and then into abutting each other on-sleeper arched sections and end sections bent inward the clip; each of the side lengthy sections is formed by a part of a circumference with a center lying on the crossing of a longitudinal axial line of the rectilinear on-rail section and a straight line passing through a point of support of the on-sleeper arched section by a sleeper and a point of force application on an end section.
  • one more disadvantage of this clip is primarily local nature of stress distribution, i.e., in the process of loading the clip by an external load individual sections of the claims become overloaded (a high level of stress concentration appears therein), which leads to formation of fractures and shortens the life time of the clip.
  • a clip structure for rail fastening is disclosed; the structure is made as a single part shaped mirror-symmetrically relative to its longitudinal axis and comprising a rectilinear on-rail section changing on two opposite sides on rounding radii into clip side sections bent upward archwise and deflected outward that are continued in arched, in the projection on a horizontal plane, sections changing into free peripheral sections directed with their ends toward the position of the rectilinear on-rail section of the clip, said free peripheral sections of the clip being made rectilinear and being located below the maximum rise level of the side sections of the clip, and the clip being made, in the projection onto a horizontal plane, smoothly extended with its side sections towards location of the on-rail section.
  • a disadvantage of this technical solution is also excessive stiffness of the clip structure, though the structure of this clip has side sections with complex spatial geometry.
  • the closest analog to the proposed invention is the RU 174600 U1 information source, 23.10.2017 (the closest prior art), wherein the structure of a spring rod-shaped clip fastener for a rail fastening is disclosed that is B-shaped in the plan view (in the projection on a horizontal plane) and that comprises the following sections radially abutting each other in the plan view: a rectilinear section resting on a rail, intermediate sections located at a right angle thereto that are rectilinear in the plan view and radially convex in their profile (in the projection onto a vertical plane), sections resting on a thrust member of a rail fastening, and end sections that are radial in the plan view, radially convex in their profile (in the projection onto a vertical plane) and directed toward the sections resting on the thrust member of the rail fastening; wherein values of inner radii of the intermediate and end sections are equal in the profile, and, in the free state, the clip profile is a figure which closed contour consists of
  • a clip fastener of this structure (a relatively flat clip) is characterized by localized nature of stress distribution (i.e., a high stress concentration factor).
  • clip fastener structures (relatively flat) known in the art do not provide distribution of stresses appearing in operation over the entire clip fastener, which leads to stress localization on certain clip fastener sections, thus overloading them and resulting in shortening the life time of such clip fasteners in general.
  • the object of the proposed invention is to eliminate the disadvantages existing in the prior art.
  • the technical effect achievable when the proposed invention is implemented is higher stability of a force of pressing a rail against a rail support by the spring rod-shaped clip fastener due to its structure having complex spatial geometry, which has enabled to reduce its stiffness owing to increasing a resilient motion of the clip fastener and, at the same time, reduce stress concentration and raise efficiency of using the material of the clip fastener due to making a greater length of the rod operable.
  • a spring rod-shaped clip fastener for a rail fastening is made of a resilient rod bent to form a single B-shaped part in the projection onto a horizontal plane that is symmetrical relative to the transverse axis and consists of sections radially mated therebetween in the projection onto a horizontal plane, said sections comprising a section of resting on a rail, which is rectilinear in the projection onto a horizontal plane and changes on two opposite sides along rounding radii into side sections located perpendicularly to a track centerline and being rectilinear in the projection onto a horizontal plane, said side sections change into radial, in the projection onto a horizontal plane, sections of resting on a thrust member of the rail fastening, which change into end sections directed with their ends towards the section of resting on the rail and are rectilinear in the projection onto a horizontal plane; the section of resting on the rail is made, in its longitudinal profile, convex radially with two edge
  • Novel in the proposed invention is the structure of the clip fastener having a shape with a complex spatial geometry, as compared to the technical solutions known in the art, due to which a radially convex shape of the clip fastener is obtained both in the longitudinal profile, and in the transverse profile.
  • Such sections include a section of resting on a rail, side sections perpendicular to the track centerline, end sections that contact a fastening means (a bolt, screw, etc.), thus providing a point of force application.
  • a fastening means a bolt, screw, etc.
  • the longitudinal profile and the transverse profile should be understood in this invention as a front view and a side view, respectively.
  • the section of resting on a rail which is radially convex in the transverse profile, bends when receiving an acting load.
  • the side sections of the clip which are located perpendicularly to the track centerline, are rectilinear in the projection onto a horizontal plane and radially convex in the transverse profile, are subject to bending and twisting when receiving an external load, but are more compliant due to their complex spatial geometry (as compared to the clip fastener of the closest prior art) relative to the clip fastener longitudinal axis, which enables the clip fastener to provide better stability of the rail pressing force.
  • the end sections of the clip fastener when subject to an external load, bend. Their structural design enables to provide a required resilient motion of the clip fastener, which, in its turn, enables to provide a required rail pressing force when the clip fastener is tightened by a fastening means (a bolt, screw, etc.).
  • a fastening means a bolt, screw, etc.
  • the resilient motion of the clip fastener should be understood as a value of its vertical movement in the point of contact with the fastening means tightened until a required rail pressing force is reached.
  • the proposed structure of the clip fastener has higher compliance and, at the same time, has stress distribution over a greater area of the structure of the clip fastener due to its complex spatial geometry.
  • Figure 1 chows the rail fastening wherein the resilient clip of the closest prior art is used, owing to which a rail is pressed against a rail support; the rail base is positioned on a resilient under-rail pad (1) serving for reducing dynamic loads on an under-rail foundation.
  • the resilient clip When a rail fastening assembly is mounted, the resilient clip is secured with a fastening means (a bolt, screw, etc.), and a force of pressing the rail to the rail support is generated in the course of tightening the fastening means.
  • a fastening means a bolt, screw, etc.
  • a reduction in the pressing force may lead to an insufficient force of fastening rail lengths, loss of temperature conditions of fastening rail lengths, displacement of track.
  • the above deviations from normal maintenance of a railway track may lead to an increase in man-hours required for the operating the track.
  • Figures 2 and 3 show the proposed clip fastener in different views that show the sections of the proposed clip fastener forming complex spatial geometry.
  • the proposed spring rod-shaped clip fastener for the rail fastening is made as a single part having a symmetrical B-shape in the projection onto a horizontal plane.
  • This implementation is realized by bending a rod of a resilient material in preset points to form the sections of the clip fastener, namely, a section (2) of resting on a rail, which is radially convex in the longitudinal profile with the formation of two points (6) of support, two side sections (3) radially convex in the transverse profile and directed perpendicularly to the permanent way axis, sections (4) of resting on a thrust member, end sections (5) (see Fig. 2 ).
  • Figure 2 shows the longitudinal axis (7) and the transverse axes (8) of the proposed clip fastener.
  • the most preferable type of material used for making the proposed clip fastener is steel.
  • Figure 3 shows the proposed resilient clip fastener in a front view, a top view, a sectional side view (A section) and an isometric view in order to better explain the structural differences helping to achieve the claimed technical effect.
  • a value of an inner radius of the side sections in the transverse profile is less than a value of an inner radius of the end sections; owing to this, the structure of the proposed clip fastener has a different geometrical shape in its different sections, in particular, the side sections may compensate for a reduction in a force of pressing a rail due to its sagging as a result of a decreased pad thickness, and the end sections provide a force of pressing a rail when the clip fastener is tightened with fastening means.
  • this implementation provides sufficiently uniform stress distribution over the mated sections of the resilient clip.
  • the calculations simulated the process of tightening the fastening means (as one of the calculated cases of loading the clip) for loading the clip to the point of pressing of a rail with the force equal to 12.5 kN per one of the two fastening clips.
  • Figures 4.1 and 4.2 show the calculation results on distribution of equivalent stresses for the prototype clip, a top view and a bottom view, respectively; and the non-linear calculation step was selected that corresponded to the clamping force of 12.5 kN (for one clip).
  • the pattern of distribution of equivalent stresses relates to a qualitative type (the calculation results comprise graphic information on clip areas with different levels of equivalent stresses without indicating numerical values of these stresses).
  • the areas with the lowest stress values are shown in blue color, the areas with medium stress values are shown in blue, green, yellow, and orange colors according to increases in stresses, respectively, and the areas with the highest stress values are shown in red color.
  • FIG. 5.1 and 5.2 Another pattern of stress distribution is shown in Figures 5.1 and 5.2 , since they show the results of calculating equivalent stress distribution for the proposed technical solution, a top view and a bottom view, respectively; the non-linear calculation step is selected that corresponds to the clamping force of 12.5 kN (for one clip).
  • Figures 5.1 and 5.2 present equivalent stress distribution plots showing that the maximum stress zone is located on the inner portion of the section of resting on the thrust member (the highest stress zone is marked in red in this Figure).
  • this zone in the proposed clip has smaller dimensions, which enables to draw a conclusion that equivalent stresses are distributed over the length of the rod of the proposed clip fastener more uniformly.
  • the proposed solution enables to lower the stress concentration level, which increases the life time of the clip fastener.
  • the section of resting on the rail of proposed clip has equivalent stress distribution with medium values (green color in Figures 5.1 and 5.2 ), which enables to draw a conclusion that the section of resting on the rail works when the clip is loaded.
  • the conclusion may be drawn that the proposed technical solution, namely the spring rod-shaped clip fastener for a rail fastening having the shape with complex spatial geometry provides increased stability of the rail pressing force by increasing the clip structure compliance simultaneously with providing stress distribution over a greater portion of the clip structure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Railway Tracks (AREA)
EP23020340.8A 2022-11-08 2023-07-06 Federstabförmiger clip-befestiger zur schienenbefestigung Pending EP4368775A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EA202292889 2022-11-08

Publications (1)

Publication Number Publication Date
EP4368775A1 true EP4368775A1 (de) 2024-05-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP23020340.8A Pending EP4368775A1 (de) 2022-11-08 2023-07-06 Federstabförmiger clip-befestiger zur schienenbefestigung

Country Status (1)

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EP (1) EP4368775A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2740144A1 (de) * 1977-09-06 1979-03-15 Portec Inc Schienenbefestigungselement
RU170573U1 (ru) 2016-08-24 2017-04-28 Дмитрий Витальевич Гвидонский Клемма для рельсового скрепления
RU174600U1 (ru) 2017-04-07 2017-10-23 Открытое Акционерное Общество "Российские Железные Дороги" Пружинная прутковая клемма рельсового скрепления
RU2767807C1 (ru) 2021-11-09 2022-03-22 Вячеслав Михайлович Мишунин Пружинная клемма рельсового скрепления

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2740144A1 (de) * 1977-09-06 1979-03-15 Portec Inc Schienenbefestigungselement
RU170573U1 (ru) 2016-08-24 2017-04-28 Дмитрий Витальевич Гвидонский Клемма для рельсового скрепления
RU174600U1 (ru) 2017-04-07 2017-10-23 Открытое Акционерное Общество "Российские Железные Дороги" Пружинная прутковая клемма рельсового скрепления
RU2767807C1 (ru) 2021-11-09 2022-03-22 Вячеслав Михайлович Мишунин Пружинная клемма рельсового скрепления

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BLUM E. E.: "Dictionary of Main Metal Science Terms", 2002

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