WO1991013786A1 - Suspension system - Google Patents

Suspension system Download PDF

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Publication number
WO1991013786A1
WO1991013786A1 PCT/CA1991/000084 CA9100084W WO9113786A1 WO 1991013786 A1 WO1991013786 A1 WO 1991013786A1 CA 9100084 W CA9100084 W CA 9100084W WO 9113786 A1 WO9113786 A1 WO 9113786A1
Authority
WO
WIPO (PCT)
Prior art keywords
support
vehicle according
axle
support member
pivotally connected
Prior art date
Application number
PCT/CA1991/000084
Other languages
French (fr)
Inventor
Steven P. Lapp
Peter E. Timan
Original Assignee
Utdc Inc.
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 Utdc Inc. filed Critical Utdc Inc.
Publication of WO1991013786A1 publication Critical patent/WO1991013786A1/en

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
    • B61F5/02—Arrangements permitting limited transverse relative movements between vehicle underframe or bolster and bogie; Connections between underframes and bogies
    • B61F5/04—Bolster supports or mountings
    • B61F5/08—Bolster supports or mountings incorporating rubber springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/22—Resilient suspensions characterised by arrangement, location or kind of springs having rubber springs only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
    • B61D13/00—Tramway vehicles
    • 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

  • the present invention relates to an axle assembly for rail vehicles.
  • the use of rail vehicles in urban mass transit applications and airport people movers has resulted in the need for a compact lightweight vehicle that may be produced economically.
  • Most vehicles are derived from conventional passenger carrying vehicles using running gear designed to cover long distances at high speeds under varying track conditions. Consequently, the running gear tends to be heavy and designed as a unit separate from the vehicle.
  • the adaptation of these units for mass transit therefore results in running gear that tends to be over-engineered for the particular application and, in turn, dictates the overall construction of the vehicle on which it is used.
  • Transit vehicles should facilitate the loading and unloading of passengers with the minimum of inconvenience, be able to run on tracks with small radius of curvature and minimize weight to reduce the motive power required.
  • the first of these requirements suggests a low floor level for the vehicle to avoid the need for purpose built platforms and the second requirement suggests the use of steerable axles to minimize flange contact between the wheel and rail.
  • An axle assembly for a mass transit vehicle must accomodate these needs and it is therefore an object of the present invention to provide an axle assembly which obviates or mitigates the above disadvantages.
  • an axle assembly for a transit vehicle comprising an axle beam having wheels rotatably supported at opposite ends and pivotally connected to a chassis member intermediate its ends for rotation about a vehicle steering axis, a support member vertically spaced from said beam and having pivot means located thereon to permit rotation of
  • a vehicle comprising a body supported at spaced locations by a pair of axle assemblies and a chassis extending between the axle assemblies, said axle assemblies comprising an axle beam having a wheel rotatably supported at opposite ends and pivotally connected intermediate its ends to said chassis member for movement about a vertical steering axis, a support member vertically spaced from said beam and pivotally connected to said body for rotation about said vertical steering axis, and resilient suspension means extending between said beam and support at laterally spaced locations to either side of said steering axis to maintain said beam and support in spaced relationship.
  • Figure 1 is a diagrammatic representation of a transit system
  • Figure 2 is a view on the line 2-2 of Figure 1;
  • Figure 3 is a view on the line 3-3 of Figure 2;
  • Figure 4 is a view on the line 4-4 of Figure 2;
  • Figure 5 is a view on the line 5-5 of Figure 2.
  • Figure 6 is a view on the line 6-6 of Figure 2. Referring therefore to Figure 1, a transit system
  • the 10 comprises a pair of transit vehicles 12 interconnected by an articulated joint 14. Each of the vehicles 12 is substantially identical in construction and therefore only one will be described in detail.
  • the transit vehicle 12 has a body 16 supported on a pair of axle assemblies 18 that run along a track 20.
  • the body 16 includes a floor pan 22 having a central depressed area 24 located between elevated end portions 26.
  • Seats 28 are supported by the elevated portions 26 to provide oppositely facing benches to either side of the well 24.
  • axle assemblies 18 are maintained in longitudinally spaced relationship by a chassis 30 that extends beneath the floor pan 22 along the length of the vehicle.
  • each of the axle assemblies 18 is secured to the underside of the elevated portion 26 by a turntable 32.
  • the turntable 32 comprises an outer ace 34 secured to the elevated portion 26 and an inner race 36 secured to a diamond shaped plate 38.
  • the races 34 and 36 are separated by ball bearings 40 to permit rotation about a vertical axis indicated at V-V.
  • Plate 38 is secured to a generally transverse horizontal support member 42 which has longitudinally extending outriggers 44 to provide support for the plate 38. Opposite ends of the support member 42 are provided with an inclined plate 46 that serves as a mounting point for a resilient suspension element 48. These elements are typically formed from elastomeric cylinders with the opposite ends received on an inclined support bracket 50. Brackets 50 are mounted at opposite ends of a horizontal axle tube 52 that has wheels 54 rotatably mounted at opposite ends. The wheels 54 are rotatably mounted on hubs 56 secured to the tube 52 and supporting the wheels 54 on bearings 58.
  • the elements 48 are inclined so that a projection of their longitudinal axis intersects the rail 20 at the contact point of the rail with the wheel, thereby reducing the bending moment on the tube 52.
  • the tube 52 is hollow and a torque transmitting tube 60 extends through the axle tube 52 and is connected at opposite ends by discs 62
  • Bracket 64 includes a pair of aligned bores 66 that accommodate bearings 68.
  • the bearings engage bosses 70 secured to the upper and lower surfaces of the tube 52 to constrain the tube 52 for rotation about an axis coincident with the axis of rotation of the turntable 32.
  • Bracket 64 also includes a pair of upstanding ears
  • Link 76 transmits longitudinal forces induced by acceleration and deceleration from the body 16 to the chassis 30.
  • Drag link assembly 86 comprises a vertical link 88 depending from the support member 42 with a U-shaped bracket 90 mounted at one end.
  • a second vertical link 92 projects upwardly from the rear face of the tube 52 to overlap in the vertical direction bracket 90.
  • a tie rod 94 extends between the bracket 90 and link 92 and is received in bores 96. The tie rod 94 is secured within the bores 96 through elastomeric bushings 98 to permit limited movement in the vertical direction between the tube 52 and support member 42. Resistance to roll between the body 16 and chassis
  • torsion bar 100 secured by hangers 102 to the front edge of support member 42 ( Figure 4) .
  • the torsion bar 100 is free to pivot in the hangers 102 and has its opposite end portions 104 offset from the pivot axis of the torsion bar 100 at the support member 42.
  • SUBSTITUTE SHEET vertical link 106 extends from the end portions 104 to brackets 108 secured to the axle tube 52 with elastomeric bushings 110,112 resiliently connecting the vertical link 106 to the torsion bar 100 and bracket 108 respectively.
  • Roll of the body 16 on the chassis 20 induces a torsional load in the bar 100 which acts through the axle tube 52 to oppose the rolling motion.
  • the axle tube 52 also includes a mounting bracket 114 to receive a steering link (not shown) that controls rotation of the axle assemblies about their respective steering axis to insure that they maintain themselves in a radial orientation.
  • a steering link (not shown) that controls rotation of the axle assemblies about their respective steering axis to insure that they maintain themselves in a radial orientation.
  • the vertical loads of the vehicle are transmitted through the turntable 32 and into the axle assemblies 18.
  • the suspension elements 48 provide for resilience between the axle tube 52 and support member 42 to provide primary suspension for the vehicle.
  • the loads imparted by the suspension are taken through the turntable 32 and therefore further reinforcement of the body 16 is not required.
  • the constraints applied to the support member 42 and tube 52 enable the axle assembly 18 to be accommodated within the well in the floor pan 22 that would normally be required for the seats 28. It will be seen therefore that a simple compact axle assembly is provided which may be accommodated within a lightweight vehicle without inducing excessive loading at a number of points within the vehicle.

Abstract

An axle assembly (18) comprises a support member (42) pivotally mounted to a vehicle body (16) for rotation about a vertical steering axis (6). An axle beam (52-60) is pivotally connected to a chassis (30) for movement about the steering axis (6) and has a wheel (54) at opposite ends. Elastomeric suspension elements (48) are located between the ends of the beam (52-60) and the ends of the support member (42) to maintain the tube and support member (42) in a vertically spaced relationship.

Description

SUSPENSION SYSTEM
The present invention relates to an axle assembly for rail vehicles. The use of rail vehicles in urban mass transit applications and airport people movers has resulted in the need for a compact lightweight vehicle that may be produced economically. Most vehicles are derived from conventional passenger carrying vehicles using running gear designed to cover long distances at high speeds under varying track conditions. Consequently, the running gear tends to be heavy and designed as a unit separate from the vehicle. The adaptation of these units for mass transit therefore results in running gear that tends to be over-engineered for the particular application and, in turn, dictates the overall construction of the vehicle on which it is used.
Transit vehicles should facilitate the loading and unloading of passengers with the minimum of inconvenience, be able to run on tracks with small radius of curvature and minimize weight to reduce the motive power required. The first of these requirements suggests a low floor level for the vehicle to avoid the need for purpose built platforms and the second requirement suggests the use of steerable axles to minimize flange contact between the wheel and rail. An axle assembly for a mass transit vehicle must accomodate these needs and it is therefore an object of the present invention to provide an axle assembly which obviates or mitigates the above disadvantages.
According to the present invention, there is provided an axle assembly for a transit vehicle comprising an axle beam having wheels rotatably supported at opposite ends and pivotally connected to a chassis member intermediate its ends for rotation about a vehicle steering axis, a support member vertically spaced from said beam and having pivot means located thereon to permit rotation of
SUBSTITUTE SHEET said support member about said vertical steering axis, and resilient suspension means extending between said beam and said support member at laterally spaced locations to either side of said steering axis to maintain said beam and support in spaced relationship.
According also to the present invention, there is provided a vehicle comprising a body supported at spaced locations by a pair of axle assemblies and a chassis extending between the axle assemblies, said axle assemblies comprising an axle beam having a wheel rotatably supported at opposite ends and pivotally connected intermediate its ends to said chassis member for movement about a vertical steering axis, a support member vertically spaced from said beam and pivotally connected to said body for rotation about said vertical steering axis, and resilient suspension means extending between said beam and support at laterally spaced locations to either side of said steering axis to maintain said beam and support in spaced relationship.
An embodiment of the present invention will now be described by way of example only with reference to the accompanying drawings in which
Figure 1 is a diagrammatic representation of a transit system;
Figure 2 is a view on the line 2-2 of Figure 1; Figure 3 is a view on the line 3-3 of Figure 2;
Figure 4 is a view on the line 4-4 of Figure 2;
Figure 5 is a view on the line 5-5 of Figure 2; and
Figure 6 is a view on the line 6-6 of Figure 2. Referring therefore to Figure 1, a transit system
10 comprises a pair of transit vehicles 12 interconnected by an articulated joint 14. Each of the vehicles 12 is substantially identical in construction and therefore only one will be described in detail. The transit vehicle 12 has a body 16 supported on a pair of axle assemblies 18 that run along a track 20. The body 16 includes a floor pan 22 having a central depressed area 24 located between elevated end portions 26. Seats 28 are supported by the elevated portions 26 to provide oppositely facing benches to either side of the well 24.
The axle assemblies 18 are maintained in longitudinally spaced relationship by a chassis 30 that extends beneath the floor pan 22 along the length of the vehicle.
As can best be seen in Figure 2, each of the axle assemblies 18 is secured to the underside of the elevated portion 26 by a turntable 32. The turntable 32 comprises an outer ace 34 secured to the elevated portion 26 and an inner race 36 secured to a diamond shaped plate 38. The races 34 and 36 are separated by ball bearings 40 to permit rotation about a vertical axis indicated at V-V.
Plate 38 is secured to a generally transverse horizontal support member 42 which has longitudinally extending outriggers 44 to provide support for the plate 38. Opposite ends of the support member 42 are provided with an inclined plate 46 that serves as a mounting point for a resilient suspension element 48. These elements are typically formed from elastomeric cylinders with the opposite ends received on an inclined support bracket 50. Brackets 50 are mounted at opposite ends of a horizontal axle tube 52 that has wheels 54 rotatably mounted at opposite ends. The wheels 54 are rotatably mounted on hubs 56 secured to the tube 52 and supporting the wheels 54 on bearings 58. The elements 48 are inclined so that a projection of their longitudinal axis intersects the rail 20 at the contact point of the rail with the wheel, thereby reducing the bending moment on the tube 52. The tube 52 is hollow and a torque transmitting tube 60 extends through the axle tube 52 and is connected at opposite ends by discs 62
SUBSTITUTE SHEET to the respective wheels 54. The tube 60 thus interconnects the wheels 54 for conjoint rotation.
The tube 52 is pivotally mounted to the chassis 30 through a bracket 64 secured to the chassis 30. Bracket 64 includes a pair of aligned bores 66 that accommodate bearings 68. The bearings engage bosses 70 secured to the upper and lower surfaces of the tube 52 to constrain the tube 52 for rotation about an axis coincident with the axis of rotation of the turntable 32. Bracket 64 also includes a pair of upstanding ears
72 that receive a ball joint 74 located at one end of a link 76. The opposite end of link 76 is formed as a clevis 78 that is secured by a pin 80 to a ball joint 82 mounted on a bracket 84 secured to the vertical surface of the elevated portion 26 of body 16. Link 76 transmits longitudinal forces induced by acceleration and deceleration from the body 16 to the chassis 30.
" The support member 42 and axle tube 52 are maintained in a common vertical plane by means of a drag link assembly 86 best seen in Figure 5. Drag link assembly 86 comprises a vertical link 88 depending from the support member 42 with a U-shaped bracket 90 mounted at one end. A second vertical link 92 projects upwardly from the rear face of the tube 52 to overlap in the vertical direction bracket 90. A tie rod 94 extends between the bracket 90 and link 92 and is received in bores 96. The tie rod 94 is secured within the bores 96 through elastomeric bushings 98 to permit limited movement in the vertical direction between the tube 52 and support member 42. Resistance to roll between the body 16 and chassis
30 is provided by means of a torsion bar 100 secured by hangers 102 to the front edge of support member 42 (Figure 4) . The torsion bar 100 is free to pivot in the hangers 102 and has its opposite end portions 104 offset from the pivot axis of the torsion bar 100 at the support member 42. A
SUBSTITUTE SHEET vertical link 106 extends from the end portions 104 to brackets 108 secured to the axle tube 52 with elastomeric bushings 110,112 resiliently connecting the vertical link 106 to the torsion bar 100 and bracket 108 respectively. Roll of the body 16 on the chassis 20 induces a torsional load in the bar 100 which acts through the axle tube 52 to oppose the rolling motion.
The axle tube 52 also includes a mounting bracket 114 to receive a steering link (not shown) that controls rotation of the axle assemblies about their respective steering axis to insure that they maintain themselves in a radial orientation. The details of the steering mechanism, however, do not form part of the present invention, it being apparent that one of many well-known systems may be incorporated for use with the axle shown in the present application.
In operation, the vertical loads of the vehicle are transmitted through the turntable 32 and into the axle assemblies 18. The suspension elements 48 provide for resilience between the axle tube 52 and support member 42 to provide primary suspension for the vehicle. The loads imparted by the suspension are taken through the turntable 32 and therefore further reinforcement of the body 16 is not required. The constraints applied to the support member 42 and tube 52 enable the axle assembly 18 to be accommodated within the well in the floor pan 22 that would normally be required for the seats 28. It will be seen therefore that a simple compact axle assembly is provided which may be accommodated within a lightweight vehicle without inducing excessive loading at a number of points within the vehicle.
SUBSTITUTE SHEET

Claims

We claim:
1. An axle assembly for a transit vehicle comprising an axle beam having wheels rotatably supported at opposite ends for rotation about a generally horizontal axis and pivotally connected to a chassis member intermediate its ends for rotation about a vertical steering axis intersecting said horizontal axis, a support member vertically spaced from said beam and having pivot means located thereon to permit rotation of said support member about said vertical steering axis, and resilient suspension means extending between said beam and said support member at laterally spaced locations to either side of said steering axis to" maintain said beam and support in spaced relationship.
2. An axle assembly according to claim 1 including link means extending between said beam and said support to provide conjoint steering movement of said beam and support.
3. An axle assembly according to claim 2 wherein said link means includes a horizontal drag link pivotally connected at opposite ends to said support and beam respectively to permit relative vertical displacement therebetween.
4. An axle assembly according to claim 3 wherein said pivotal connections are resilient bushings.
5. An axle assembly according to claim 3 wherein a pair of drag links are provided, one on each side of said steering axis.
6. An axle assembly according to claim 2 wherein said resilient suspension means are elastomeric members.
SUBSTITUTE SHEET
7. An axle assembly according to claim 6 wherein said elastomeric members are inclined inwardly toward said support member.
8. An axle assembly according to claim 7 wherein a projection of the longitudinal axis of said elastomeric members passes through the contact area of said wheel on the surface on which it rolls.
9. A vehicle comprising a body supported at spaced locations by a pair of axle assemblies and a chassis extending between the axle assemblies, said axle assemblies comprising an axle beam having a wheel rotatably supported at opposite ends for rotation about a generally horizontal axis, and pivotally connected intermediate its ends to said chassis member for movement about a vertical steering axis intersecting said horizontal axis, a support member vertica iy spaced from said beam and pivotally connected to said body for rotation about said vertical steering axis and resilient suspension means extending between said beam end support at laterally-spaced locations to either side of said steering axis to maintain said beam and support in spaced relationship.
10. A vehicle according to claim 9 wherein said axle assemblies include attachment means to permit steering links to impart steering movement thereto.
11. A vehicle according to claim 9 wherein said support member is pivotally connected to said body by an annular bearing assembly disposed between a pair of plates, one of which is secured to said body and the other of which is connected to said support member.
SUBSTITUTE SHEET
12. A vehicle according to claim 9 wherein said support members are pivotally connected to a floor pan of said body at longitudinally spaced locations, said suspension means maintaining said floor pan elevated from said chassis between said pivotal connections.
13. A vehicle according to claim 12 wherein said pivotal connections are located at opposite ends of said body and said floor pan is elevated at each end to accommodate said support members.
14. A vehicle according to claim 13 wherein said elevated portions of said floor pan provide supports for seats located in said body.
15. A vehicle according to claim 13 wherein said link means extending between said beam and said support provides conjoint steering movement of said beam and support.
16. A vehicle according to claim 15 wherein said link means includes a horizontal drag link pivotally connected at opposite ends to said support and beam respectively to permit relative vertical displacement therebetween.
17. A vehicle according to claim 16 wherein said pivotal connections are resilient bushings.
18. A vehicle according to claim 16 wherein a pair of drag links are provided, one on each side of said steering axis.
19. A vehicle according to claim 15 wherein said resilient suspension means are elastomeric members.
ET
20. A vehicle according to claim 19 wherein said elastomeric members are inclined inwardly toward said support member.
21. A vehicle according to claim 20 wherein a projection of the longitudinal axis of said elastomeric members passes through the contact area of said wheel on the surface on which it rolls.
SUBSTITUTE SHEET
PCT/CA1991/000084 1990-03-15 1991-03-14 Suspension system WO1991013786A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US49394290A 1990-03-15 1990-03-15
US493,942 1990-03-15

Publications (1)

Publication Number Publication Date
WO1991013786A1 true WO1991013786A1 (en) 1991-09-19

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ID=23962363

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1991/000084 WO1991013786A1 (en) 1990-03-15 1991-03-14 Suspension system

Country Status (2)

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AU (1) AU7451191A (en)
WO (1) WO1991013786A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AP1499A (en) * 2000-11-28 2005-11-30 Deton Engineering Pty Limited Wheel and axle assembly.
WO2006013451A1 (en) * 2004-08-02 2006-02-09 Dolphin Electric Holdings Inc Rotating electrical machine
WO2015053682A1 (en) 2013-10-07 2015-04-16 Rosenqvist Rail Ab A device for a wheel axle and a track bounded vehicle with such a wheel axle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3073620A (en) * 1960-09-01 1963-01-15 Lord Mfg Co Spring suspension
DE1405613A1 (en) * 1960-06-17 1969-06-04 Metalastik Ltd Wheel suspension for vehicles
US3797863A (en) * 1972-08-11 1974-03-19 Cunha Prod Inc Lightweight converter dolly
FR2255192A1 (en) * 1973-12-20 1975-07-18 Wragg Ronald
US3961582A (en) * 1971-10-14 1976-06-08 Hamilton Neil King Paton Articulated railcar

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1405613A1 (en) * 1960-06-17 1969-06-04 Metalastik Ltd Wheel suspension for vehicles
US3073620A (en) * 1960-09-01 1963-01-15 Lord Mfg Co Spring suspension
US3961582A (en) * 1971-10-14 1976-06-08 Hamilton Neil King Paton Articulated railcar
US3797863A (en) * 1972-08-11 1974-03-19 Cunha Prod Inc Lightweight converter dolly
FR2255192A1 (en) * 1973-12-20 1975-07-18 Wragg Ronald

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AP1499A (en) * 2000-11-28 2005-11-30 Deton Engineering Pty Limited Wheel and axle assembly.
WO2006013451A1 (en) * 2004-08-02 2006-02-09 Dolphin Electric Holdings Inc Rotating electrical machine
WO2015053682A1 (en) 2013-10-07 2015-04-16 Rosenqvist Rail Ab A device for a wheel axle and a track bounded vehicle with such a wheel axle
EP3055181B1 (en) * 2013-10-07 2021-08-04 Rosenqvist Rail AB A device for a wheel axle and a track bounded vehicle with such a wheel axle

Also Published As

Publication number Publication date
AU7451191A (en) 1991-10-10

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