Railway rolling stock – Trucks – Radial
Patent
1990-04-27
1993-05-18
Le, Mark T.
Railway rolling stock
Trucks
Radial
1051991, B61F 538
Patent
active
052111164
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a bogie for high-speed rail vehicles.
In the prior art, devices are known which are intended to prevent sinusoidal running of the wheel sets of a rail vehicle (DE-PS 934 453).
Bogies of rail vehicles are also known whose set of wheels are guided in parallel using means which are also known in order to ensure stable straight travel by means of a stiff to rigid wheel set guiding in the longitudinal direction of the vehicle, in particular in high-speed vehicles (DE-PS 834 256). By the additional mounting of rolling dampers, the turning-out resistance between bogie and carriage body can be increased and disadvantageous side effects, which are produced on a straight track due to the rotary oscillations arising from rolling, can be thus effectively damped (DE-PS 2 042 458). Although bogie vehicles thus equipped do run in a sufficiently stable manner at high speeds, in bends they exhibit unacceptably high wheel/rail wear.
Relatively new developments attempt to unite these contrary requirements of stable running at high speeds and low wear in the bends, in particular by the radial adjustment of the sets of wheels towards the center point of the bend during travel round bends. To this end, hitherto, two modes of operation known in the prior art have been used, in particular mutual automatic control (EP-0 221 667) or constrained control of the wheel sets from the carriage body (EP-0 072 328). The disadvantage of both embodiments has been that the wheel sets are subject to a certain amount of faulty control especially when running into and out of the bend, which also leads to wheel/rail wear and impairs running on bends. The most recent practical experiments have shown, furthermore, that known controls for wheel sets already respond to the small, rapid turning-out movements which arise inside the track clearance as a result of sinusoidal running. This too leads to faulty controls of the wheel sets, which reduce stability and cause wear.
To optimize a bogie in terms of running stability and travelling round bends, the following are therefore of critical importance:
SUMMARY OF THE INVENTION
The object of the invention, then, is to create a bogie for a high-speed rail vehicle, which even at high travel speeds exhibits stable vehicle running which spares the track by virtue of the radial adjustment of the wheel sets only during travel on bends.
The object is achieved by separating the dynamic movements due to sinusoidal running from the quasi-static movements of the bend travel.
DESCRIPTION OF THE DRAWINGS
The invention, as well as its objects, advantages and features will be more readily understood from the following detailed description, when considered in conjunction with the appended drawings, in which:
FIG. 1 is a perspective diagram of the construction according to the invention of a bogie with a control device for the mutual automatic control of the wheel sets, provided with restraining means and a decoupling device,
FIG. 2 is a perspective diagram of a bogie similar to that of FIG. 1, with a variant of the decoupling device,
FIG. 3 is a perspective diagram similar to FIG. 1 and 2 of a bogie with a control device for the constrained control of the wheel sets from the carriage body, provided with restraining means and a decoupling device.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A first example of application is illustrated in FIG. 1, wherein a bogie 1 is provided with a respective automatic control device 11, 11' for the mutual automatic control of the two wheel sets 5, 5'. In this case, a bogie frame 2 is on the one side supported on the wheel sets 5, 5' by known guide, suspension and damping means, and on the other side the bogie frame 2 carries and guides with similar means of the secondary spring stage an associated carriage body 10. The bogie frame 2 is provided with two rotary bearings 3, 3', in each of which is mounted a respective steering lever 12, 12' of the automatic control devices 11, 11' mounted on both sides of the bogie frame 2.
REFERENCES:
patent: 424089 (1890-03-01), Bosdevex
patent: 4648326 (1987-03-01), Jackson
patent: 4660476 (1987-04-01), Franz
patent: 4676172 (1987-06-01), Bullock
patent: 4679507 (1987-07-01), Rassain
patent: 4903613 (1990-02-01), Lang et al.
patent: 4926756 (1990-05-01), Smith et al.
Le Mark T.
SIG - Schweizerische Industrie-Gesellschaft
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