EP0313188A2 - Longitudinal steering linkage for truck with interaxle yokes - Google Patents
Longitudinal steering linkage for truck with interaxle yokes Download PDFInfo
- Publication number
- EP0313188A2 EP0313188A2 EP88306882A EP88306882A EP0313188A2 EP 0313188 A2 EP0313188 A2 EP 0313188A2 EP 88306882 A EP88306882 A EP 88306882A EP 88306882 A EP88306882 A EP 88306882A EP 0313188 A2 EP0313188 A2 EP 0313188A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- steering
- truck
- car body
- wheelsets
- yoke
- 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.)
- Granted
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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
- B61F5/38—Arrangements or devices for adjusting or allowing self- adjustment of wheel axles or bogies when rounding curves, e.g. sliding axles, swinging axles
- B61F5/44—Adjustment controlled by movements of vehicle body
Definitions
- This invention relates to railway vehicles having trucks which are equipped with wheelsets which are pivotally mounted to the truck.
- the wheelsets are guided to a radial alignment during travel of the railway vehicle along circular curved track.
- each wheelset is mounted in a steering yoke.
- the yokes are interconnected.
- these mechanisms make use of the yaw motion of the car body relative to the truck centre line to create the steering motions.
- forces are created in a lateral direction on the outboard yoke and reacted through a reference link and lateral link to the truck side frame.
- the stiffness which can be designed into these type of components making up the mechanical linkage, is usually such that steering accuracy is inadequate and stability against hunting oscillations is unsatisfactory.
- the steering mechanism of this invention may be mounted on an existing truck having axles mounted in interconnected yokes.
- the mechanism is offset laterally from the centre line of the truck. It is advantageous to effect the mechanism as far as practical.
- a steering mechanism for use on a railway vehicle having a car body mounted on at least two trucks. At least one of the trucks has inboard and outboard wheelsets, each of the wheelsets being mounted in a yoke. The inboard and outboard yokes are pivotally interconnected. Each of the wheelsets is affixed to the truck in such a manner as to be adapted for relative pivotal movement with respect to the truck about a general vertical axis.
- the mechanism further includes a steering mechanism for guiding the wheelsets to a radial alignment when the vehicle is travelling on circular curved track.
- the mechanism comprises a steering link connected to the car body and a steering lever which is pivotally connected to the steering link.
- a linkage mechanism interconnects the steering lever and the inboard and outboard yokes whereby relative longitudinal movement of the car body/steering link connection point with respect to the truck when moving from tangent track to circular track causes relative and opposite pivotal movement of the inboard and outboard yokes whereby the wheelsets assume a radial configuration when on curved track.
- Figure 1 illustrates in side view, a truck or bogie, incorporating a preferred embodiment of the steering mechanism of this invention
- Figures 2 and 3 show plan views of the truck or bogie.
- the mechanism may be mounted on typical wheelset yokes and is offset laterally from the centre line of the truck as far as practical.
- a bracket may be attached to the outboard yoke which bracket carries the lower pivot for a vertical steering lever which is thereby connected to it.
- a steering rod is connected to the bracket by means of a pivotal connection and this steering rod is similarly attached to the inboard yoke through a bracket carrying a pivot connection.
- the top of the steering lever is connected to a longitudinal steering link through a pivot connection and the other end of that link is connected to the car body.
- the steering link As the car body swivels relative to the truck the steering link is moved fore and aft relative to points on the truck, thus pivoting the steering lever and forcing the yokes apart or together. Because the yokes are pinned together at the centre of the truck, the action of the steering mechanism is to cause the wheelset/yoke assemblies to rotate relative to one another into a steered alignment. Correct proportioning of the lever ratio ensures that true radial alignment is achieved on circular curves.
- FIG. 1 illustrates a truck generally at 10 having a steering mechanism according to this invention installed thereon.
- the truck comprises an outboard wheelset 12 and an inboard wheelset 14.
- Each wheelset as will be understood by those familiar with railroad art, comprises an axle and a pair of flanged conical wheels fixed thereto such that the axle and wheels turn at the same radial speed.
- Such conical wheelsets if permitted appropriate freedom will move to a radial configuration when travelling on curved tracks.
- such single wheelsets are unstable and will continue to hunt when travelling on either tangent track or on curved track.
- the wheelsets are mounted in yokes.
- the outboard yoke is indicated at 16 and the inboard yoke at 18.
- the truck frame is indicated generally at 20.
- a bracket 30 is attached to outboard yoke 16.
- the bracket 30 comprises a pivotal connection 32 at a convenient portion of the bracket.
- a substantially vertical steering lever 34 is pivotally connected to bracket 30 at pivotal connection 32.
- the steering lever 34 has a pivotal connection 36 at its upper end.
- a steering link 40 is pivotally connected to steering lever 34 at the pivotal connection 36.
- the steering link 40 is attached to the car body, which is not illustrated, at connection 42.
- the bracket 30, steering lever 34 and steering link 40 are all located laterally as remote as possible from the centre line of the vehicle.
- the location of the steering mechanism is dictated by the configuration of the truck frame, the yokes and the configuration of bracket 30.
- the advantage of having the mechanism remote as far as possible from the centre line is that larger motions are available for more accurate steering inputs.
- the steering lever 34 has a pivotal connection 44 which is intermediate the pivotal connections 32 and 36.
- a steering rod 46 is pivotally connected to the steering lever 34 at pivotal connection 44.
- the steering rod 46 is pivotally connected to a bracket 48 at pivotal connection 50.
- Bracket 48 is affixed to the inboard steering yoke 18.
- the outboard steering yoke 16 and the inboard steering yoke 18 are pivotally connected to each other for relative pivotal movement.
- connection 42 will move longitudinally as the truck pivots with respect to the car body.
- the steering lever 34 will be caused to pivot about the pivotal connection 32.
- the steering rod 46 to be drawn to the left with respect to the pivotal connection 32.
- the two wheels illustrated of wheelsets 12 and 14 respectively will be moved towards each other and thus accomplish a turn with the centre of curvature in front of the sheet.
- movement in the other direction will cause the wheels illustrated in the drawing to move further apart accomplishing a turn in the direction with the radius of curvature behind the sheet.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Steering Controls (AREA)
- Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
- Handcart (AREA)
- Motor Power Transmission Devices (AREA)
- Platform Screen Doors And Railroad Systems (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Automatic Cycles, And Cycles In General (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
Description
- This invention relates to railway vehicles having trucks which are equipped with wheelsets which are pivotally mounted to the truck. The wheelsets are guided to a radial alignment during travel of the railway vehicle along circular curved track.
- Railway trucks having steerable axles to achieve radial alignment are well-known in the art. Various mechanisms have been provided to steer the axles to a radial alignment.
- In some trucks equipped for radial alignment of the wheelsets each wheelset is mounted in a steering yoke. The yokes are interconnected. Typically these mechanisms make use of the yaw motion of the car body relative to the truck centre line to create the steering motions. In such trucks, forces are created in a lateral direction on the outboard yoke and reacted through a reference link and lateral link to the truck side frame. In experience it has been found that the mechanical advantage of this system demanded the production of relatively large forces in order to generate the required steering motions and maintain them against the influences of wheel/rail forces, particularly those acting at the flange of the wheels when flange rail contact occurs and also the oscillatory forces generated during hunting. The stiffness, which can be designed into these type of components making up the mechanical linkage, is usually such that steering accuracy is inadequate and stability against hunting oscillations is unsatisfactory.
- A new linkage has been developed to overcome these deficiencies. According to the new linkage steering motions are created without utilization of the truck frame for any pivotal connections.
- The steering mechanism of this invention may be mounted on an existing truck having axles mounted in interconnected yokes. The mechanism is offset laterally from the centre line of the truck. It is advantageous to effect the mechanism as far as practical.
- According to the invention there is provided a steering mechanism for use on a railway vehicle having a car body mounted on at least two trucks. At least one of the trucks has inboard and outboard wheelsets, each of the wheelsets being mounted in a yoke. The inboard and outboard yokes are pivotally interconnected. Each of the wheelsets is affixed to the truck in such a manner as to be adapted for relative pivotal movement with respect to the truck about a general vertical axis. The mechanism further includes a steering mechanism for guiding the wheelsets to a radial alignment when the vehicle is travelling on circular curved track. The mechanism comprises a steering link connected to the car body and a steering lever which is pivotally connected to the steering link. A linkage mechanism interconnects the steering lever and the inboard and outboard yokes whereby relative longitudinal movement of the car body/steering link connection point with respect to the truck when moving from tangent track to circular track causes relative and opposite pivotal movement of the inboard and outboard yokes whereby the wheelsets assume a radial configuration when on curved track.
- A more complete understanding of the invention may be had by reference to the attached drawings and description which illustrate preferred embodiments of the invention and in which
- Figure 1 illustrates in side view, a truck or bogie, incorporating a preferred embodiment of the steering mechanism of this invention, and Figures 2 and 3 show plan views of the truck or bogie.
- When a railroad vehicle moves from tangent track to circular curved track there is relative rotation between the car body and the trucks supporting the car body typically at either end of the railroad vehicle. In view of the relative rotation of the truck and car body, a point remote from the centre line of the car body will appear to move in the longitudinal direction with reference to the truck as well as having slight motion in the lateral direction. The longitudinal component of such motion is directly related to the radius of curvature and is used in this invention as the steering input to guide the wheelsets to a radial configuration.
- Generally speaking, the mechanism may be mounted on typical wheelset yokes and is offset laterally from the centre line of the truck as far as practical. A bracket may be attached to the outboard yoke which bracket carries the lower pivot for a vertical steering lever which is thereby connected to it. At a point on the steering lever, intermediate between its upper and lower ends, a steering rod is connected to the bracket by means of a pivotal connection and this steering rod is similarly attached to the inboard yoke through a bracket carrying a pivot connection. The top of the steering lever is connected to a longitudinal steering link through a pivot connection and the other end of that link is connected to the car body.
- As the car body swivels relative to the truck the steering link is moved fore and aft relative to points on the truck, thus pivoting the steering lever and forcing the yokes apart or together. Because the yokes are pinned together at the centre of the truck, the action of the steering mechanism is to cause the wheelset/yoke assemblies to rotate relative to one another into a steered alignment. Correct proportioning of the lever ratio ensures that true radial alignment is achieved on circular curves.
- Figure 1 illustrates a truck generally at 10 having a steering mechanism according to this invention installed thereon. The truck comprises an
outboard wheelset 12 and aninboard wheelset 14. Each wheelset, as will be understood by those familiar with railroad art, comprises an axle and a pair of flanged conical wheels fixed thereto such that the axle and wheels turn at the same radial speed. Such conical wheelsets if permitted appropriate freedom will move to a radial configuration when travelling on curved tracks. However, as also well understood by those familiar with this art, such single wheelsets are unstable and will continue to hunt when travelling on either tangent track or on curved track. - In the
truck 10 as illustrated in Figure 1 the wheelsets are mounted in yokes. The outboard yoke is indicated at 16 and the inboard yoke at 18. The truck frame is indicated generally at 20. - A
bracket 30 is attached tooutboard yoke 16. Thebracket 30 comprises apivotal connection 32 at a convenient portion of the bracket. A substantiallyvertical steering lever 34 is pivotally connected tobracket 30 atpivotal connection 32. Thesteering lever 34 has apivotal connection 36 at its upper end. Asteering link 40 is pivotally connected tosteering lever 34 at thepivotal connection 36. Thesteering link 40 is attached to the car body, which is not illustrated, atconnection 42. - The
bracket 30,steering lever 34 andsteering link 40 are all located laterally as remote as possible from the centre line of the vehicle. The location of the steering mechanism is dictated by the configuration of the truck frame, the yokes and the configuration ofbracket 30. The advantage of having the mechanism remote as far as possible from the centre line is that larger motions are available for more accurate steering inputs. - The
steering lever 34 has apivotal connection 44 which is intermediate thepivotal connections steering rod 46 is pivotally connected to thesteering lever 34 atpivotal connection 44. Thesteering rod 46 is pivotally connected to abracket 48 atpivotal connection 50.Bracket 48 is affixed to theinboard steering yoke 18. - The
outboard steering yoke 16 and theinboard steering yoke 18 are pivotally connected to each other for relative pivotal movement. - With respect to the Figure it may be appreciated that the
connection 42 will move longitudinally as the truck pivots with respect to the car body. Assuming that theconnection 42 moves to the left in the Figure, thesteering lever 34 will be caused to pivot about thepivotal connection 32. This in turn causes thesteering rod 46 to be drawn to the left with respect to thepivotal connection 32. Thus, on this side of the truck the two wheels illustrated ofwheelsets - It will be understood by those skilled in the art that the mechanism may be duplicated on either side of the truck to provide a redundant steering mechanism.
Claims (6)
a steering mechanism for guiding said wheelsets to a radial alignment when said vehicle is travelling on circular curved track, comprising
a steering link (40) connected to said car body remote from the longitudinal centre line of said car body,
a steering lever (34) pivotally connected to said steering link (40),
and linkage mechanism (30,46,48) interconnecting said steering lever (34) and said inboard (18) and outboard (16) yokes whereby longitudinal movement of the connection (42) between said steering link (40) and said car body with respect to said truck when said truck rotates with respect to said body guides said wheelsets (16,18) to a radial alignment.
a steering lever (34) pivotally connected to said steering link (40), a pivotal connection between said steering lever and said outboard wheelset, said steering lever (34) having a further pivotal connection (44) intermediate said pivotal connection between said steering lever and said steering link and the pivotal connection between said steering lever and said outboard yoke
a steering rod (46) pivotally linked to said steering lever (34) at said further pivotal connection, said steering rod pivotally linked to said inboard yoke.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT88306882T ATE83445T1 (en) | 1987-07-28 | 1988-07-26 | LINKAGE FOR THE LONGITUDINAL CONTROL OF THE INNER AXLE JACKS OF RAILWAY BOGIES. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US7874287A | 1987-07-28 | 1987-07-28 | |
US78742 | 1987-07-28 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0313188A2 true EP0313188A2 (en) | 1989-04-26 |
EP0313188A3 EP0313188A3 (en) | 1989-11-29 |
EP0313188B1 EP0313188B1 (en) | 1992-12-16 |
Family
ID=22145953
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88306882A Expired - Lifetime EP0313188B1 (en) | 1987-07-28 | 1988-07-26 | Longitudinal steering linkage for truck with interaxle yokes |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0313188B1 (en) |
JP (1) | JPH01106769A (en) |
KR (1) | KR890001814A (en) |
AT (1) | ATE83445T1 (en) |
AU (1) | AU609502B2 (en) |
DE (1) | DE3876751T2 (en) |
HU (1) | HU201707B (en) |
PL (1) | PL273961A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0930210A1 (en) * | 1998-01-14 | 1999-07-21 | SLM Schweizerische Lokomotiv- und Maschinenfabrik AG | Running gear for railway vehicles and railway vehicle with at least one such running gear |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2624719A1 (en) * | 1976-05-07 | 1977-11-17 | Schweizerische Lokomotiv | RAIL VEHICLE |
EP0072328A1 (en) * | 1981-08-07 | 1983-02-16 | SOCIETE M T E Société anonyme | Bogie with orientatable wheel axles |
EP0165752A2 (en) * | 1984-06-21 | 1985-12-27 | Railway Engineering Associates, Inc. | Self-steering trucks |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH542743A (en) * | 1971-09-24 | 1973-10-15 | Schweizerische Lokomotiv | Device for transmitting tractive and braking forces on a rail vehicle |
-
1988
- 1988-07-26 DE DE8888306882T patent/DE3876751T2/en not_active Expired - Fee Related
- 1988-07-26 AT AT88306882T patent/ATE83445T1/en not_active IP Right Cessation
- 1988-07-26 EP EP88306882A patent/EP0313188B1/en not_active Expired - Lifetime
- 1988-07-27 AU AU20034/88A patent/AU609502B2/en not_active Ceased
- 1988-07-28 KR KR1019880009536A patent/KR890001814A/en not_active Application Discontinuation
- 1988-07-28 JP JP63189566A patent/JPH01106769A/en active Pending
- 1988-07-28 PL PL27396188A patent/PL273961A1/en unknown
- 1988-07-28 HU HU884013A patent/HU201707B/en not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2624719A1 (en) * | 1976-05-07 | 1977-11-17 | Schweizerische Lokomotiv | RAIL VEHICLE |
EP0072328A1 (en) * | 1981-08-07 | 1983-02-16 | SOCIETE M T E Société anonyme | Bogie with orientatable wheel axles |
EP0165752A2 (en) * | 1984-06-21 | 1985-12-27 | Railway Engineering Associates, Inc. | Self-steering trucks |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0930210A1 (en) * | 1998-01-14 | 1999-07-21 | SLM Schweizerische Lokomotiv- und Maschinenfabrik AG | Running gear for railway vehicles and railway vehicle with at least one such running gear |
Also Published As
Publication number | Publication date |
---|---|
DE3876751T2 (en) | 1993-07-08 |
EP0313188B1 (en) | 1992-12-16 |
JPH01106769A (en) | 1989-04-24 |
EP0313188A3 (en) | 1989-11-29 |
KR890001814A (en) | 1989-04-06 |
AU2003488A (en) | 1989-02-02 |
HU201707B (en) | 1990-12-28 |
PL273961A1 (en) | 1989-04-17 |
DE3876751D1 (en) | 1993-01-28 |
AU609502B2 (en) | 1991-05-02 |
ATE83445T1 (en) | 1993-01-15 |
HUT49310A (en) | 1989-09-28 |
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