EP1186504B1 - Railcar truck - Google Patents

Railcar truck Download PDF

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Publication number
EP1186504B1
EP1186504B1 EP01307658A EP01307658A EP1186504B1 EP 1186504 B1 EP1186504 B1 EP 1186504B1 EP 01307658 A EP01307658 A EP 01307658A EP 01307658 A EP01307658 A EP 01307658A EP 1186504 B1 EP1186504 B1 EP 1186504B1
Authority
EP
European Patent Office
Prior art keywords
pedestal
saddle
roof
friction
pocket
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.)
Expired - Lifetime
Application number
EP01307658A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1186504A3 (en
EP1186504A2 (en
Inventor
Paul Hewitt
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.)
English Welsh & Scottish Railway Holdings Limi
Original Assignee
English Welsh & Scottish Railway Holdings 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 English Welsh & Scottish Railway Holdings Ltd filed Critical English Welsh & Scottish Railway Holdings Ltd
Publication of EP1186504A2 publication Critical patent/EP1186504A2/en
Publication of EP1186504A3 publication Critical patent/EP1186504A3/en
Application granted granted Critical
Publication of EP1186504B1 publication Critical patent/EP1186504B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
    • B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
    • B61F5/26—Mounting or securing axle-boxes in vehicle or bogie underframes
    • B61F5/30—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes
    • B61F5/301—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes incorporating metal springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
    • B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
    • B61F5/26—Mounting or securing axle-boxes in vehicle or bogie underframes
    • B61F5/30—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes
    • B61F5/308—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes incorporating damping devices

Definitions

  • the present invention is directed to a railcar truck, and in particular to a railcar truck having a side frame pedestal including a cast iron wear plate adapted to engage a friction wedge and a saddle having an adjustable and removable rocker member and a removable link arm.
  • Railcar trucks include a pair of spaced apart generally parallel side frames connected by a transverse bolster.
  • Bach side frame includes a pedestal at each end that is adapted to be connected by a saddle to a wheel set.
  • a plurality of springs extend between the saddle and the side frame such that the side frame is resiliently supported on the saddle. Friction wedges are disposed between the saddle and the side frame to dampen vertical, lateral and longitudinal movement of the side frame with respect to the saddle.
  • An embodiment of the invention comprises a pedestal of a side frame for a railcar truck having a first and second friction wedge in which the pedestal includes a first pedestal jaw having a first interior face and a second pedestal jaw including a second interior face.
  • a first wear member is attached to the first face of the pedestal jaw and includes a front friction surface adapted to engage a first friction wedge.
  • a second wear member is attached to the second face of the second pedestal jaw and includes a front friction surface adapted to engage a second friction wedge.
  • the first wear member and the second wear member are formed from the material having a kinetic coefficient of friction with steel of approximately 0.15 such as cast iron.
  • the railcar truck 20 as shown in Figure 1 includes a pair of spaced apart and generally parallel side frames 22 (only one shown).
  • the side frames 22 arc connected to one another by a transverse bolster (not shown).
  • Each side frame 22 includes a pedestal 24 at each end.
  • the pedestal 24 includes a first pedestal jaw 26 and a second pedestal jaw 28.
  • a pedestal cavity 30 is formed between the first and second pedestal jews 26 and 28.
  • the first pedestal jew 26 includes an inclined face 32 and the second pedestal jaw 28 includes an inclined face 34.
  • a saddle 35 is adapted to be located within the pedestal cavity 30.
  • a plurality of resilient coil springs 36 extend between the saddle 35 and the pedestal 24 such that the pedestal 24 is resiliently supported by the springs 36.
  • a bearing 37 and an axle 38 of a wheel set is coupled to the saddle 35 such that the axle 38 is rotatable with respect to the saddle 35.
  • a plurality of friction wedges 39 having wear surfaces formed of composite material and steel or acicular iron, are resiliently biased by one or more springs 36 into engagement with the pedestal 24 and the saddle 35 to dampen vertical movement of the pedestal 24 with respect to the saddle 35.
  • a wear member 40 is removably attached to the inside surface the inclined face 32 of the first pedestal jaw 28 and a wear member 40 is also attached to the inside surface of the inclined face 34 of the second pedestal jaw 28.
  • the wear member 40 includes a generally rectangular wear plate 42 having a top edge 44, a bottom edge 46, and spaced apart and generally parallel first and second side edges 48 and 50 which extend between the top and bottom edges 44 and 46.
  • the wear plate 42 includes a generally planar front friction surface 52 and a generally planar rear surface 54 which is generally parallel to the friction surface 52.
  • the wear plate 42 includes one or more apertures 56 which may be conical or countersunk.
  • the wear plate 42 is preferably formed from cast iron which has a kinetic coefficient of friction with steel or acicular iron of approximately 0.15.
  • the wear member 40 also includes a backing member 60 which may be attached to the rear surface 54 of the wear plate 42 by an adhesive or the like.
  • the backing member 60 extends generally coextensively with the rear surface 54.
  • the backing member 60 is preferably formed from a sheet of polytetrafluoroethylene (PTFE) that is approximately one millimeter thick.
  • the backing member 60 includes an exterior surface 62 and one or more apertures 64 which are respectively aligned with the apertures 56 in the wear plate 42.
  • the backing member 60 is adapted to be placed adjacent the inclined face 32 or 34 of the pedestal 24 to accommodate any surface irregularities in the cast surface of the inclined faces 32 and 34 thereby providing a good mating fit between the rear surface 54 of the wear plates 42 and the inclined faces 32 and 34.
  • the backing member 60 reduces or dampens any noise that may otherwise be produced between the fit of the wear plate 42 with the pedestal 24.
  • the saddle 3 5 of the railcar truck 20 as best shown in Figure 4 extends between a first end 70 and a second end 72.
  • the saddle 35 includes a center post 74 having a generally horizontal roof 76, a first side wall 78 that extends downwardly from the roof 76 to a bottom end 80, and a second side wall 82 that extends downwardly from the roof 76 to a bottom end 84.
  • the second side wall 82 is spaced apart from the first side wall 78 and a cavity 86 is formed therebetween.
  • a horizontal first shelf 88 extends outwardly from the bottom end 80 of the first side wall 78 to the first end 70 of the saddle 35.
  • a horizontal second shelf 90 extends outwardly from the bottom end 84 to the second end 72 of the saddle 35.
  • Each shelf 88 and 90 is adapted to engage and support the bottom end of a spring 36 as shown in Figure 1.
  • the roof 76 includes a roof cavity 92 that is in communication with the cavity 86.
  • the bottom end 80 of the first side wall 78 includes a pocket 94 and the bottom end 84 of the second side wall 82 includes a pocket 95.
  • Each pocket 94 and 95 includes a vertical and generally planar rear wall 96, a horizontal and generally planar top wall 98, a vertical generally planar first side wall 100, and a vertical and generally planar second side wall 102.
  • the first side wall 100 is spaced apart from and is generally parallel to the second side wall 102.
  • the pockets 94 and 95 are in communication with the cavity 86.
  • Each pocket 94 and 95 is open at its bottom end that opposes ita top wall 98.
  • the first pocket 94 forms a pair of opposing wing members 104 at the bottom end 80 of the first side wall 78 on each side of the pocket 94.
  • the second pocket 95 forms a pair of opposing wing members 106 on each side of the pocket 95 at the bottom end 84 of the second side wall 82.
  • a threaded bore 108 extends vertically upwardly through the top wall 98 of the pocket 94 into the first side wall 78.
  • a threaded bore 110 extends vertically upwardly through the top wall 98 of the pocket 95 into the second side wall 82.
  • the saddle 35 includes a selectively removable link member 120.
  • the link member 120 extends generally linearly between a first end 122 and a second end 124.
  • the first end 122 includes an aperture 126 and the second end 124 includes an aperture 127.
  • the first end 122 as best shown in Figure 6, includes a generally vertical and planar end wall 128 which is adapted to engage the rear wall 96 of the first pocket 94 of the first side wall 78.
  • the first end 122 of the link member 120 also includes a generally horizontal and planar top wall 130 that is adapted to engage the top wall 98 of the first pocket 94 of the first side wall 78.
  • the second end 124 of the link member 120 includes a vertical and generally planar end wall 132 that is adapted to engage the rear wall 96 of the second pocket 95 of the second side wall 82.
  • the second end 124 of the link member 120 also includes a horizontal and generally planar top wall 134 which is adapted to engage the top wall 98 of the second pocket 95.
  • the center portion of the link member 120 is generally I-shaped.
  • the first end 122 of the link member 120 is inserted into the first pocket 94 of the first side wall 78 of the saddle 35 such that the end wall 128 engages the rear wall 96 of the first pocket 94, and such that the vertical aperture 126 is aligned with the aperture 108 in the top wall 98 of the pocket 94.
  • a fastener 136 such as a bolt is inserted through the first end 122 of the link member 120 into the saddle bore 108 of the top wall 98.
  • the second end 124 of the link member 120 is inserted into the second pocket 95 of the second side wall 82 of the saddle 35 such that the end wall 132 engages the rear wall 96 of the second pocket 95.
  • the vertical aperture 127 at the second end 124 of the link member 120 is aligned with the bore 110 in the top wall 98 of the second pocket 95 and a fastener 138 is placed therethrough
  • the length of the link member 120 between the end walls 128 and 132 is such that the link member 120 will closely fit between and mate with the rear walls 96 of the first pocket 94 and second pocket 95 due to use of an interference fit.
  • the link member 120 is placed in compression during operation by the loads that are applied from the springs 36 to the shelves 88 and 90 of the saddle 35.
  • the fasteners 136 and 138 do not act to transfer any shear load or shear force between the link member 120 and the first and second side walls 78 and 82 of the saddle 35.
  • the loads from the first and second side walls 78 and 82 are transferred to the link member 120 by engagement with the end walls 128 and 132 of the link member 120.
  • the fasteners 136 and 138 are tightened in order to apply a compression frustrum between the end of the link member 120 and the top walls 98 of the pockets 94 and 95 of the saddle 35. Hence the link member 120 is held in contact with the saddle pockets at all times on walls 96 and 98 of pockets 94 and 95 of saddle 35.
  • the link member 120 facilitates easy maintenance of the railcar truck 20.
  • the fasteners 13 6 and 13 8 are removed, and then the link member 120 is removed from the saddle 35. This is done by use of an expansion tool acting between the side walls 78 and 82, such that the pocket rear walls 96 are moved apart in order to negate the interference fit of the ends of the link member 120 over walls 128 and 132.
  • the saddle 35, springs 36, and side frame 22 may then be lifted upwardly away from the wheel set to enable the performance of maintenance.
  • the saddle 35, springs 36, and side frame 22 are held together during lifting by retaining studs 142.
  • the saddle 35 is supported on the bearing 37 and axle 38 of the wheel set by a rocker member 150.
  • the rocker member 150 includes a top wall 152 which is generally planar and which is adapted to be inserted into the roof cavity 92 of the roof 76 of the saddle 35.
  • the rocker member 150 also includes a bottom wall 154 which is adapted to engage the bearing 37.
  • the rocker member 150 includes a plurality of threaded bores which extend into the rocker member 150 through the top wall 152.
  • a backing member 158 is placed between the rocker member 150 and the roof 76 of the saddle 35 within the roof cavity 92 to accommodate any cast or forged surface irregularities in the surface of the roof 76.
  • the backing member 158 is preferably a sheet of PTFE approximately one millimeter thick.
  • the backing member 158 also reduces or dampens noise which may otherwise be created between the rocker member 150 and the saddle 35.
  • the rocker member 150 is removably attached to the roof 76 of the saddle 35 by a plurality of threaded fasteners 160 which extend through apertures in the roof 76 and which threadably engage the bores 156 in the rocker member 150.
  • the mechanical attachment of the rocker member 150 to the roof 76 of the saddle 35 by the fasteners 160 enables the rocker member 150 to be easily and quickly replaced if the rocker member becomes worn or damaged.
  • the mechanical attachment of the rocker member 150 to the roof 76 also enables, when desired, a shim 162 to be placed between the top wall 152 of the rocker member 150 and the backing member 158 that is located within the roof cavity 92 of the roof 76.
  • the shim 162 includes a plurality of apertures through which the fasteners 160 may extend from the roof 76 into the bores 156 of the rocker member 150.
  • the shim 162 includes a top wall 164 that is adapted to engage the backing member 158 and a bottom wall 166 that is adapted to engage the top wall 152 of the rocker member 150.
  • the shim 162 may have a thickness of up to approximately eighteen to twenty millimeters between the top wall 164 and the bottom wall 166.
  • the ability to place a shim 162 of a desired thickness between the rocker member 150 and the backing member 158 in the roof 76 enables the saddle 35 and its adjoining parts to be height adjusted to accommodate excessive wheel wear and spring vertical movement that otherwise would cause the car body buffer centers go out of gauge tolerance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Plates (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Lens Barrels (AREA)
  • Handcart (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Platform Screen Doors And Railroad Systems (AREA)
  • Escalators And Moving Walkways (AREA)
EP01307658A 2000-09-11 2001-09-10 Railcar truck Expired - Lifetime EP1186504B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US23156000P 2000-09-11 2000-09-11
US231560P 2000-09-11

Publications (3)

Publication Number Publication Date
EP1186504A2 EP1186504A2 (en) 2002-03-13
EP1186504A3 EP1186504A3 (en) 2002-11-06
EP1186504B1 true EP1186504B1 (en) 2007-08-22

Family

ID=22869744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01307658A Expired - Lifetime EP1186504B1 (en) 2000-09-11 2001-09-10 Railcar truck

Country Status (6)

Country Link
US (1) US20020092440A1 (es)
EP (1) EP1186504B1 (es)
AT (1) ATE370873T1 (es)
DE (1) DE60130076T2 (es)
ES (1) ES2292543T3 (es)
NO (1) NO20014387L (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0311480D0 (en) * 2003-05-20 2003-06-25 Powell Duffryn Rail Ltd Improvements in the track friendliness of Y25 bogie
GB2434132B (en) * 2003-07-08 2007-12-12 Nat Steel Car Ltd Rail road car truck and members thereof
GB0711383D0 (en) * 2007-06-13 2007-07-25 Sct Europ Ltd Suspension for a rail vehicle
EP3045373B1 (en) * 2015-01-19 2020-03-04 VR-Yhtymä Oy Friction damper supported by a joint
EP3045372B1 (en) * 2015-01-19 2020-02-26 VR-Yhtymä Oy Spring-enhanched friction damper supported by a joint

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3394662A (en) * 1965-05-24 1968-07-30 Midland Ross Corp Tracking truck
US3638582A (en) * 1969-12-03 1972-02-01 Buckeye Steel Castings Co Resilient bearing mounting
US4192240A (en) * 1978-04-12 1980-03-11 Amsted Industries Incorporated Pedestal roof wear liner
US5404826A (en) * 1991-08-08 1995-04-11 Pennsy Corporation Bearing adapter for railway trucks having downward depending ends on adapter plate for protecting the adapter thrust lugs
US5450799A (en) * 1994-01-11 1995-09-19 Amsted Industries Incorporated Truck pedestal design

Also Published As

Publication number Publication date
NO20014387L (no) 2002-03-12
NO20014387D0 (no) 2001-09-10
DE60130076T2 (de) 2008-01-03
EP1186504A3 (en) 2002-11-06
US20020092440A1 (en) 2002-07-18
EP1186504A2 (en) 2002-03-13
ES2292543T3 (es) 2008-03-16
DE60130076D1 (de) 2007-10-04
ATE370873T1 (de) 2007-09-15

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