Railway rolling stock – Trucks – Bogie
Patent
1990-12-20
1992-11-03
Oberleitner, Robert J.
Railway rolling stock
Trucks
Bogie
B61B 1200
Patent
active
051598817
DESCRIPTION:
BRIEF SUMMARY
This application relates to copending U.S. patent application Ser. No. 07/623,722, filed Dec. 21, 1990 now pending in the names of the same inventors.
BACKGROUND OF THE INVENTION
The present invention relates to the railway vehicle industry and more particularly to a process and a system capable of calming the oscillatory motions of the railway vehicle body independently of the disturbances created by the geometrical imperfections of the rails.
French Patent filed on Dec. 3, 1984 under the No. 84-18377 (2,574,036) describes a damping device for the body of a railway vehicle based on the measurement of the body acceleration and the direction of the relative displacement between the body and the rolling element. It consists of reducing--or even eliminating--the action of the dampers placed between the body and the rolling element during the phases of the motion during which the action of these dampers, if it were maintained, would result in maintaining the pulsating motions rather than suppressing them owing to the motions pertaining to the rolling element to which these dampers are attached.
BRIEF SUMMARY OF THE INVENTION
The present invention constitutes an improvement of the device described in the aforementioned patent in that the device may act in a quasi-continuous manner owing to the use of an energy accumulator having a regeneratable energy and to the use of a double-acting cylinder instead of a single switchable damper. Relative to the device described in the aforementioned patent, the present device is moreover simplified by the fact that it no longer requires a detector of the direction of the relative motion of the body relative to the rolling element against which the cylinder bears.
In an advantageous form of the invention, the system is integrated into each wheel bearing of the vehicle and, in this latter case, it permits not only calming the oscillatory motions of the body but also reducing the transmission of the forces between the body and the rail to solely the transmission of the weight to the respective wheel.
The invention also provides a process for calming the motions of railway vehicle elements having a pulsating character, such as the bodies or the axles, by means of a damping device comprising an accelerometer responsive to the direction of the motion to be calmed, a circuit for processing the signal issuing from the accelerometer and a hydraulic double-acting cylinder interposed between the body and the rolling element, characterized by selectively feeding one or the other of the chambers of the cylinder in response to the signals delivered by the processing circuit, from a reservoir of oil under pressure, and automatically regenerating a part of the energy prevailing in the reservoir by the relative motions between the body and the rolling element.
BRIEF DESCRIPTION OF THE DRAWINGS
A better understanding of the invention will be possible from a reading of the following detailed description with reference to the accompanying drawings which represent, by way of example, the manner in which may be calmed for each truck (or axle), the pulsating vertical motion of the body, it being of course understood that the invention may be applied to all of the pulsating motions of the body i.e. sway-roll, yaw and pitch motions, and wherein:
FIG. 1 is a schematic cross-sectional view of a railway body and its truck;
FIG. 2 is a diagrammatic view of the control system of a device according to the invention;
FIG. 3 is another diagrammatic view of a variant of the device shown in FIG. 2;
FIG. 4 is a schematic longitudinal cross-sectional view of an example of the mechanical compensating device according to the invention;
FIG. 4A shows schematic views which illustrate at I, II, and III the different possible positions taken up by the boisseaux seen in detail A of FIG. 4;
FIG. 5 is a diagrammatic view of the electronic part which completes the control adapted to eliminate the forces of inertia exerted on the respective axle; and
FIG. 6 is a view similar to FIG. 4 of another version of the de
REFERENCES:
patent: 3906869 (1975-09-01), Dobson et al.
patent: 4069767 (1978-01-01), Glaze
patent: 4440093 (1984-04-01), Kake
patent: 4480555 (1984-11-01), Shafer et al.
patent: 4715289 (1987-12-01), Okamoto et al.
Durand Charles R.
Durand Jerome C.
Le Mark T.
Oberleitner Robert J.
LandOfFree
Method and system for damping the oscillatory motions of railway does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and system for damping the oscillatory motions of railway, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for damping the oscillatory motions of railway will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2044178