EP0402093A2 - Gerippte elastomerische Schienenunterlage - Google Patents

Gerippte elastomerische Schienenunterlage Download PDF

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Publication number
EP0402093A2
EP0402093A2 EP90306089A EP90306089A EP0402093A2 EP 0402093 A2 EP0402093 A2 EP 0402093A2 EP 90306089 A EP90306089 A EP 90306089A EP 90306089 A EP90306089 A EP 90306089A EP 0402093 A2 EP0402093 A2 EP 0402093A2
Authority
EP
European Patent Office
Prior art keywords
rail
pad
rib
tie
improvement
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.)
Withdrawn
Application number
EP90306089A
Other languages
English (en)
French (fr)
Other versions
EP0402093A3 (de
Inventor
Hartley Frank Young
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.)
McKay Australia Ltd
Original Assignee
McKay Australia Ltd
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 McKay Australia Ltd filed Critical McKay Australia Ltd
Publication of EP0402093A2 publication Critical patent/EP0402093A2/de
Publication of EP0402093A3 publication Critical patent/EP0402093A3/de
Withdrawn legal-status Critical Current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
    • E01B9/68—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair
    • E01B9/685—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair characterised by their shape
    • E01B9/686—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair characterised by their shape with textured surface
    • 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
    • E01B9/68—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair
    • E01B9/685—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair characterised by their shape

Definitions

  • This invention relates to improvements in rail insulating pads which are used to electrically and dynamically insulate the rail from the rail tie.
  • U.K. Patents 2154635 and 2152119 provide pads of relatively hard material which provide, by way of selective removal of material from the pads, good attenuation and rail stability.
  • the rail head In curved track the rail head is subject to the vertically down gravity forces from the rolling stock and in addition, horizontal centrifugal forces. These combine to impart a rolling tendency to the rail which is resisted by the rail fasteners and the pad beneath the rail.
  • the field edge is the outside edge of the rail in a track formed by a pair of rails.
  • the inside edge is referred to as the gauge side of gauge edge of the rail.
  • the present invention provides a rail pad to electrically and dynamically insulate a rail from the rail tie in which the rail pad incorporates an upstanding rib on either or both the upper and lower surface of said pad on the field edge side of said pad.
  • This invention is a way to reduce the intensity of the pressure under the field edge of the rail thereby prolonging the life of the elastomeric rail pad. This is done by providing a ridge on the field edge of the pad which runs parallel to the length of the rail and is located with the edge a short distance away from the rail edge towards the rail centre. Preferably the ridge may be about 10mm wide with the edge approximately 10mm from the field edge of the rail.
  • the rib is preferably about 1 or 1.5mm high and is preferably of a material which is compressed flat by the load of the rail and in so doing, creates a higher than normal pressure in the region of the rib which then subtracts some of the load from the region of the pad directly underneath the rail edge thereby causing a reduced pressure in this region with the consequent reduction in the tendency for the rail edge to cut the pad.
  • the increased pressure in the proximity of the pad does not create a cutting tendency since there is no edge in this area.
  • the rib should have a low height, preferably 1 to 1.5mm so that under the load of the installed rail fastening clips it compresses down to the general level of the remainder of the pad thereby ensuring that the rib does not carry the total load and also to ensure that the pad peripheral edges are in contact with the concrete rail seat and rail to ensure an adequate seal to prevent the ingress of damaging abrasive grit particles.
  • the rib can be placed either on the top side of the pad or on the bottom or alternatively, distributed between both top and bottom. However, the preferred position is on top to minimise the risk of dust entering between the pad and concrete rail face.
  • the rail head can receive a lateral force by the gravity component which exceeds the centrifugal component giving a net force towards the centre of the curve.
  • the rib is preferably applied to both the field and gauge sides which has the additional benefit of making the pad less susceptible to being installed the incorrect way around.
  • figure 1 is a general schematic view of a rail seat illustrating the position of the rail pad
  • figure 2 is a plan view of a preferred form of the invention
  • figure 3 is an edge view of the pad.
  • Figures 4A and 4B provide a comparison of the standard prior art pads and the pads of this invention.
  • the rail seat comprises a rail 7, a rail tie 8 and the rail pad 9 interposed between them.
  • the rail is fastened by the rail clips 11 seated in the clip holders 10 embedded in rail tie 8.
  • An insulator 12 lies between the rail 7 and the fastener 11.
  • the rail pad 9 comprises field side 21 and gauge side 22 with the edge recesses 23 to fit about the clip holders 10.
  • Grooves 24 are provided in the surface of the pad to improve attenuation.
  • the low ribs 25 are each about 1mm in height and are designed to lie under the rail within 10mm of the field and gauge edges of the rail.
  • a standard rail pad 30 is shown under a rail 7.
  • the arrows on the rail head indicate the direction of forces imposed on the rail by the passing rail trucks.
  • the arrow 28 on the field side 21 of the rail pad shows deep indentation underload which leads to cutting of the pad along the field edge of the rail.
  • a pad 9 of this invention shows reduced indentation 29 on the field edge due to the provision of ribs 25. There is also less roll by the rail with consequent improved stability.
  • the present invention provides an improved rail pad with enhanced durability.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Railway Tracks (AREA)
EP19900306089 1989-06-09 1990-06-05 Gerippte elastomerische Schienenunterlage Withdrawn EP0402093A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU4636/89 1989-06-09
AUPJ463689 1990-05-28

Publications (2)

Publication Number Publication Date
EP0402093A2 true EP0402093A2 (de) 1990-12-12
EP0402093A3 EP0402093A3 (de) 1991-02-06

Family

ID=3773975

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900306089 Withdrawn EP0402093A3 (de) 1989-06-09 1990-06-05 Gerippte elastomerische Schienenunterlage

Country Status (3)

Country Link
EP (1) EP0402093A3 (de)
AU (1) AU627314B2 (de)
CA (1) CA2017855C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4234007A1 (de) * 1992-07-08 1994-01-13 Schwihag Gmbh Fußauflagemodifikation für Eisenbahnschienen
WO2017190970A1 (de) * 2016-05-02 2017-11-09 Semperit Ag Holding Schienenzwischenlage

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2377942A (en) * 1942-09-05 1945-06-12 Hubbard & Company Cushioned tie plate

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2377942A (en) * 1942-09-05 1945-06-12 Hubbard & Company Cushioned tie plate

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4234007A1 (de) * 1992-07-08 1994-01-13 Schwihag Gmbh Fußauflagemodifikation für Eisenbahnschienen
WO2017190970A1 (de) * 2016-05-02 2017-11-09 Semperit Ag Holding Schienenzwischenlage

Also Published As

Publication number Publication date
AU5599990A (en) 1990-12-13
EP0402093A3 (de) 1991-02-06
CA2017855C (en) 2000-08-01
CA2017855A1 (en) 1990-12-09
AU627314B2 (en) 1992-08-20

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