Two-wheeled bogie for track-guided vehicles

Details Two-wheeled bogie for track-guided vehicles Two-wheeled bogie for track-guided vehicles

1998-04-13

2000-03-21

Le, Mark T.

Railway rolling stock

Trucks

Radial

B61F 500

Patent

active

060389818

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a two-wheeled running gear for track-guided vehicles, having a traction-assisted means for steering and having a wheel carrier.


BACKGROUND OF THE INVENTION

Since track-bound, and in particular rail-guided, vehicles for high-speed, regional and local transport have been equipped virtually exclusively with bogie-type running gears, so-called individual-wheel running gears have also recently become established. Whereas bogies have two or more sets of wheels or four or more so-called individual wheels, and are thus very heavy, individual-wheel running gears have two individual wheels, and individual-wheel-set running gears have one set of wheels.
In the case of track curves, bogies are steered by the leading set of wheels or the leading individual wheels. The small axle spacing or wheel spacing means that the wheels travel through curves with only a small amount of noise and low wear, and two or more bogies beneath the carriage body provide for stable guidance along a rectilinear track at relatively high speeds. Additional steering of the sets of wheels or individual wheels in the bogie is achieved by the diagonal connection between two sets of wheels or by utilizing the angular movements of leading and trailing carriage bodies.
Two-wheeled individual-wheel running gears have become widespread, in particular, in local and regional transport. Individual wheels make it easier in design terms to provide for simple entrance into carriages by virtue of the carriage floor being lowered to a level of approximately 300 mm, which is the case in so-called low-floor vehicles. If the so-called rolling condition, which is characterized by virtually identical rolling and circumferential speeds for the wheels which are respectively on the inside and outside of the curve, and the so-called adjustment condition, which describes the adjustment of the wheel planes tangentially, or of the wheel axles radially, with respect to the rails, are maintained, there is a virtually physically ideal reduction in wear and noise, and thus a high degree of comfort. Various methods are used in order to realize this ideal track guidance.
"Nahverkehrs-Praxis", no. 11/1992, p. 402 ff., discloses a three-part articulated vehicle with, in each case, two individual-wheel running gears per carriage body. Two individual wheels are arranged in one wheel carrier and, for each carriage, two wheel carriers are mounted in the running gear frame of the carriage body so as to be pivotable about the vertical pin in each case. The vertical king pin for the pivot pin is located in the center between the wheels of the wheel carrier, in the plane of symmetry of the vehicle. The curve-dependent pivoting or steering of the wheel carriers is effected by an additional steering linkage with respect to the pin-free articulation. In this case, the steering linkage is moved in dependence on the articulation angle between the carriage bodies, and the articulation angle is adjusted in a curve-dependent manner, with the result that the wheel carriers can be adjusted approximately radially with respect to the curve. Similar positively controlled steering of individual-wheel running gears, with, in each case, two individual wheels per running gear and a portal-like articulated structure, was developed in Austria (cf. ZEV+DET Glas. Annalen 116 (1992) no. 8/9, p. 333 ff.).
An individual-wheel running gear with self-regulating individual wheels is described in DE 34 09 103 A1 and DE 37 44 983 C2. Each of the individual wheels can be steered about a dedicated vertical pivot pin. The individual-wheel carriers, which are located opposite one another on the inside and outside of the curve, are connected by a track rod. By way of the vertical pivot pins, which are located outside the stand-up points of the wheels, the forces produced during wheel/rail contact are utilized in order to guide the wheel planes back tangentially with respect to the rail, with the result that the wear between wheel and rail is reduced considerably.
EP 02

REFERENCES:
patent: 39332 (1863-07-01), Arnoux
patent: 402950 (1889-05-01), Maloy
patent: 431072 (1890-07-01), Odell
patent: 1416775 (1922-05-01), Bauer
H.R. Kaser et al., "`Cobra`--die Schindler-/SIG-Niederflurtechnologie," Nahverkehrs-Praxis, No. 11/1992, pp. 402-404, 406 and 408.
Von Leopold Lenk et al., "Neue Fahrwerke zur Niveauabsenkung des Fahrgastfu.beta.bodens bei schienengefuhrten Stadtverkehrsmitteln," ZET+DET Glas. Ann. 116, No. 8/9, 1992, pp. 333-343.

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