WO2003022656A1 - Self steering rail vehicle - Google Patents
Self steering rail vehicle Download PDFInfo
- Publication number
- WO2003022656A1 WO2003022656A1 PCT/ZA2002/000079 ZA0200079W WO03022656A1 WO 2003022656 A1 WO2003022656 A1 WO 2003022656A1 ZA 0200079 W ZA0200079 W ZA 0200079W WO 03022656 A1 WO03022656 A1 WO 03022656A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rail vehicle
- bogie
- wheelsets
- wheelset
- wheel
- Prior art date
Links
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
- B61F5/305—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes incorporating rubber springs
Definitions
- This invention relates generally to a self steering rail vehicle and more particularly is concerned with a self steering railway bogie.
- the invention provides a rail vehicle which has at least first and second wheelsets and wherein:
- each axle box has an inclined chevron-type primary suspension
- the wheel treads may be coned at an angle of from 5° to 8° but preferably are coned at an angle less than 7°.
- the cone angle is chosen to allow the wheelsets to self- steer around the sharpest curves on a rail track without material contact of the flanges of the wheels with the rails. With a higher or steeper cone angle the likelihood of flange contact is reduced but the critical speed at which instability can occur is also reduced.
- the primary suspension may be of any appropriate type but preferably is of the type described in the specification of South African patent No. ZA97/4198 or ZA89/3711.
- the rail vehicle may include an elongate underframe or chassis with the first and second wheelsets being located respectively towards opposed ends of the underframe or chassis.
- the rail vehicle includes at least one bogie and the first and second wheelsets form part of the bogie.
- the rail vehicle will normally include at least two bogies at spaced positions to support an underframe or chassis.
- Figure 1 is a perspective view of a self steering bogie according to the invention wherein brake gear and certain ancillary equipment associated with the bogie have been omitted for clarity of illustration,
- Figure 2 is schematic end view of portion of a wheel used in the bogie of Figure 1 .
- Figure 3 illustrates in plan two wheelsets of a rail vehicle with a longer wheel base than the bogie of Figure 1 , with preferred suspension assemblies, and
- Figure 4 is a side view of a suspension arrangement used in the bogie of Figure 1.
- FIG. 1 of the accompanying drawings illustrates in perspective a self steering bogie according to the invention. As has been indicated brake gear and other ancillary equipment associated with the bogie have been omitted for clarity of illustration.
- the bogie 10 includes first and second wheelsets 12 and 14 respectively which are mounted in side frame members 16 and 18.
- a cross member 20 extends between the frame members 16 and 18 and, in use, is pivotally connected at a central point 22 to a chassis of a rail vehicle (not shown).
- Springs 24 or similar suspension elements support the cross member on the frame members.
- the springs 24 are preferably made from rubber laminations and may be circular cylindrical in shape. It has been found that rubber springs are highly suitable for they can function under overload conditions while retaining self-damping characteristics. The self-damping characteristics, in turn, eliminate friction wedges or similar devices which are used to provide a measure of friction damping when suspension elements, other than rubber springs, are used.
- Each wheelset 12, 14 includes an axle 26 and wheels 28.
- the wheels roll on rails
- Figure 2 is an end view of a portion of an axle 26 and a wheel 28.
- the wheel has a flange 32 and a track-engaging portion or tread 34.
- the tread portion is coned in the sense that it presents a conical surface, ie. a surface which is inclined to a line 36 which is parallel to the axle 26.
- the wheel tread is coned at an angle 38 which lies in the range of from 4° to 9°, typically in the range of from 5° to 7°.
- the cone angle is chosen to limit flange contact with the rail, taking into account the maximum rail curvature.
- the wheel tread has a width 40 which should be as wide as possible and the flange 32 is relatively thin to ensure maximum tread contact with the top of an associated rail 30.
- the wheel flange 32 should only contact a side of the rail 30 under unusual conditions eg. very poor track and or very sharp radius curves. In other words the wheel flange is a safety feature which comes into play under extreme conditions.
- Figure 3 depicts in plan the wheelsets 12 and 14 of a relatively long vehicle, on the rails 30.
- Each axle 26 is mounted to axle boxes which have a primary suspension consisting of inclined elastromeric chevron-type suspensions designated 44A, 44B, 44C and 44D respectively, in the manner described in the specification of South African patent No. 97/4198 or 89/3711. The disclosures in these specifications are to be deemed to be incorporated in this specification.
- the inclined chevron-type primary suspensions referred to act like springs and provide a very low yaw restraint, some vertical deflection under load and a high lateral spring rate to ensure stability and a high critical speed for "hunting" ie. the yaw oscillation of the rail vehicle about its own centre of gravity.
- FIG 4 is a side view of the chevron-type suspensions 44 referred to in connection with Figure 3.
- the chevrons on the left side of the drawing are illustrated partly sectioned, to show their construction.
- the axle 26 extends through an axle box 50 and is mounted on bearings which are located in the axle box.
- the axle is directly connected to a pair of wheels 28.
- the axle box has two inclined support surfaces 52 and 54 respectively each of which has an upstanding respective spigot 56 for correctly positioning the axle box with respect to chevrons 58 and 60, on opposed sides of the axle box.
- Other means of locating the chevrons correctly could be used in place of the spigots.
- Each of the chevrons 58 and 60 includes angled members, in this case steel plates 62, which are bonded to intermediate elements 64 of rubber or an equivalent elastomeric material.
- each chevron has a bridging plate 68 in which is formed a hole, not shown, and the corresponding spigot 56 is engaged with the hole when the chevron is placed on the inclined surface 52 or 54 of the axle box.
- the plate 66 is essentially parallel to the plates 62.
- An upper plate 70 is fixed to the body of the rail vehicle. Stops 72 or similar devices locate the upper plates 58 and 60 correctly.
- the chevrons 58 and 60 are inclined to the longitudinal axis of the axle and, viewed from the side, the chevrons are inclined to the vertical.
- the aforementioned type of suspension locates the wheel set correctly and keeps the wheel set geometry in a desired configuration.
- Figure 3 illustrates the concept of focalising. This concept is fully described in the specification of patent No. ZA97/4198.
- the wheel base is relatively short in comparison with the track gauge and minimum curvature then focalising is not usually required.
- the wheel base is relatively large compared to the track gauge and the curves are sharp then focalising would normally be required.
- Focalising can however readily be incorporated when chevrons with a small chevron angle are required. These chevrons can increase the yaw restraint substantially in sharp curves unless they are focalised.
- each wheelset follows its own path when travelling on straight (tangent) or curved track. This ensures that the coned wheel treads roll on the track at all times through track irregularities and curves with a very substantial reduction in rolling resistance.
- the wheelsets are linked to each other they influence the motion of each other. They then tend to behave like a conventional rigid wheel base bogie.
- derailments are reduced because the coned wheels with low yaw restraint steer themselves away from a track irregularity. If a wheel flange 32 does contact the rail 30 the point of contact is behind the centre of the vertical force on the rail and this generates a vertical friction force downwardly which increases the adhesion of the wheel on the rail instead of generating an unwanted vertical flange force ahead of the wheel which can lift that wheel over the rail and so result in a derailment.
- the wheelsets of the bogie of the invention are correctly aligned. Nonetheless a degree of misalignment can be tolerated as there is no interconnecting linkage between the wheelsets to generate incorrect tracking of one or both wheelsets.
- the spring characteristics of the secondary suspension must be considered, together with the leading dimensions of the bogie such as wheel diameter, track gauge and wheel base, and the superstructure and load, including parameters such as the bogie centre spacing, and the width and height above the rail.
- Empty and loaded vehicles have natural frequencies of vibration about their principal axes and synchronous/critical conditions arise when any one of these frequencies is the same as any of the input frequencies eg. hunting frequencies (lateral movement across the track) or frequencies induced by rail joints (in the longitudinal direction of the track) or the like.
- Coned wheels generate a sinusoidal motion across the track depending upon cone angle, wheel diameter and track gauge with a wavelength which is very nearly constant.
- the bogie of the invention is simple in design, effective in operation, substantially maintenance free and easy to access should service be required after unusual occurrences such as accidents or derailments.
- Expensive accurately made linkages are an undesirable feature of self-steered and steered bogies and, as stated, such linkages are avoided in the invention by making use of inclined chevron-type primary suspensions which provide lateral stability as well as reducing high frequency vibrations.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/478,012 US20040134374A1 (en) | 2001-05-15 | 2002-05-14 | Self steering rail vehicle |
BR0209643-9A BR0209643A (en) | 2001-05-15 | 2002-05-14 | Auto Steering Rail Vehicle |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ZA200103907 | 2001-05-15 | ||
ZA2001/3907 | 2001-05-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003022656A1 true WO2003022656A1 (en) | 2003-03-20 |
Family
ID=25589161
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/ZA2002/000079 WO2003022656A1 (en) | 2001-05-15 | 2002-05-14 | Self steering rail vehicle |
Country Status (3)
Country | Link |
---|---|
US (1) | US20040134374A1 (en) |
BR (1) | BR0209643A (en) |
WO (1) | WO2003022656A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008007312A1 (en) * | 2006-07-10 | 2008-01-17 | Bobinados De Transformadores S.L. | Power amplifier |
RU170576U1 (en) * | 2016-12-09 | 2017-04-28 | РЕЙЛ 1520 АйПи ЛТД | Universal articulated platform wagon |
US20180215199A1 (en) * | 2017-01-31 | 2018-08-02 | Rex Enterprises, Llc | Self-Steering Wheels for Overhead Crane or Train Car |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3680888A (en) * | 1969-08-08 | 1972-08-01 | Dunlop Co Ltd | Vehicle suspensions |
US3952669A (en) * | 1969-11-02 | 1976-04-27 | Mauzin Andre E | Snubbed railway vehicle bogie |
US4282816A (en) * | 1978-06-10 | 1981-08-11 | Dunlop Limited | Elastomeric railway suspension |
ZA893711B (en) | 1989-05-18 | 1990-01-31 | Murray Franz Philip | Suspension assembly |
EP0876947A1 (en) * | 1996-10-24 | 1998-11-11 | Urban Culture Institute Co., Inc | Axle box support device for bogie truck |
ZA974198B (en) | 1997-04-30 | 1999-02-15 | Philip Murray Franz | Suspension assembly |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4095531A (en) * | 1976-06-08 | 1978-06-20 | Phillips Petroleum Company | Railcar running gear |
US4488495A (en) * | 1981-12-28 | 1984-12-18 | The Budd Company | Soft primar suspension system for a railway car |
US5626083A (en) * | 1996-05-31 | 1997-05-06 | Gunderson, Inc. | Railroad car with lightweight center beam structure |
-
2002
- 2002-05-14 US US10/478,012 patent/US20040134374A1/en not_active Abandoned
- 2002-05-14 WO PCT/ZA2002/000079 patent/WO2003022656A1/en not_active Application Discontinuation
- 2002-05-14 BR BR0209643-9A patent/BR0209643A/en not_active IP Right Cessation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3680888A (en) * | 1969-08-08 | 1972-08-01 | Dunlop Co Ltd | Vehicle suspensions |
US3952669A (en) * | 1969-11-02 | 1976-04-27 | Mauzin Andre E | Snubbed railway vehicle bogie |
US4282816A (en) * | 1978-06-10 | 1981-08-11 | Dunlop Limited | Elastomeric railway suspension |
ZA893711B (en) | 1989-05-18 | 1990-01-31 | Murray Franz Philip | Suspension assembly |
EP0876947A1 (en) * | 1996-10-24 | 1998-11-11 | Urban Culture Institute Co., Inc | Axle box support device for bogie truck |
ZA974198B (en) | 1997-04-30 | 1999-02-15 | Philip Murray Franz | Suspension assembly |
Also Published As
Publication number | Publication date |
---|---|
BR0209643A (en) | 2004-07-06 |
US20040134374A1 (en) | 2004-07-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4483253A (en) | Flexible railway car truck | |
US4003316A (en) | Articulated railway car trucks | |
US4131069A (en) | Articulated railway car trucks | |
US4455946A (en) | Articulated trucks | |
US4938152A (en) | Flexible railway car truck | |
RU2602912C1 (en) | Freight railway car bogie with friction damping | |
US4332201A (en) | Steering railway vehicle trucks | |
US5174218A (en) | Self-steering trucks with side bearings supporting the entire weight of the vehicle | |
US5000097A (en) | Self-steering railway truck | |
MXPA04006132A (en) | Three-piece motion control truck system. | |
US4655143A (en) | Articulated trucks | |
WO2005025961A1 (en) | Railroad freight car truck suspension yaw stabilizer, and corresponding method | |
US2296106A (en) | Radial truck | |
US4570544A (en) | Diagonally braced rail truck | |
KR20200138373A (en) | Shaft box suspension device and bogie vehicle equipped with the same | |
Orlova et al. | The anatomy of railway vehicle running gear | |
US3905305A (en) | Snubbed railway truck bolster | |
EP0662059B1 (en) | Single-axle bogie for trackbound vehicle | |
JPS60229860A (en) | Truck for railway rolling stock | |
US4781124A (en) | Articulated trucks | |
US20040134374A1 (en) | Self steering rail vehicle | |
US8225720B2 (en) | Friction damping system for a railway truck | |
JPS5950546B2 (en) | Railway undercarriage support device | |
US4889054A (en) | Steering arms for self-steering trucks and truck retrofitting method | |
ZA200309182B (en) | Self steering rail vehicle. |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BY BZ CA CH CN CO CR CU CZ DE DM DZ EC EE ES FI GB GD GE GH HR HU ID IL IN IS JP KE KG KP KR LC LK LR LS LT LU LV MA MD MG MN MW MX MZ NO NZ PH PL PT RO SD SE SG SI SK SL TJ TM TR TT TZ UG US UZ VN YU ZA |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW MZ SD SL SZ UG ZW AM AZ BY KG KZ MD TJ TM AT BE CH CY DE DK ES FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 10478012 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2003/09182 Country of ref document: ZA Ref document number: 200309182 Country of ref document: ZA |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
122 | Ep: pct application non-entry in european phase | ||
122 | Ep: pct application non-entry in european phase | ||
122 | Ep: pct application non-entry in european phase | ||
NENP | Non-entry into the national phase |
Ref country code: JP |
|
WWW | Wipo information: withdrawn in national office |
Country of ref document: JP |