Railway rolling stock – Trucks – Bogie
Patent
1996-07-09
1997-11-25
Morano, S. Joseph
Railway rolling stock
Trucks
Bogie
74579R, B61F 550
Patent
active
056900341
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a composite push-pull bar for use in a rail vehicle, comprising: end-side connecting elements for axial introduction of compressive and tractive forces; and a rod-shaped structural element disposed between the end-side connecting elements for take-up and transmission of the compressive and tractive forces, the rod-shaped element comprising a longitudinally extending core and a prestressed composite winding, including a defined number of wrappings of one or several reinforcing fibers embedded in a cured matrix material, applied in a longitudinal direction of the core and extending over the connecting elements.
In motive-power rail vehicles, push-pull bars serve, e.g., to articulate the bogie to the vehicle body of the motive-power rail vehicle, with the vehicle body having a false pivot, in order to transmit the tractive and braking forces occurring during operation.
Such push-pull bars must withstand very high loads resulting from tractive and braking forces, short-term static and dynamic loads of the bogie of up to 5 g without being damaged. During operation, the push-pull bar is subject to radial and cardanic excursions between bogie and vehicle body during the negotiation of curves, when travelling on inclines as well as resulting from galloping and rolling of the bogie. These excursions are taken into account by way of end-side link joints of the push-pull bar.
It is known from German Patent DE 29 29 927 C2 to make such push-pull bars predominantly from metallic materials. In a frequently used design, a connecting bar is provided at its ends with flange-mounted joint members. These joint members embrace guiding pins which are form-fittingly secured to members of the vehicle body and to the bogie and which are, e.g., made of cast steel, and the joint members are connected to the guiding pins via a pivot bearing. In order to reduce impulses between bogie and vehicle body during start-up and braking processes, the articulation must take place by way of an elastic connection. Since the connecting bar itself is rigid, the pivot bearing is frequently configured as an elastomeric member which, on the outside and the inside, is vulcanized together with one guide bush each.
One problem of this solution is that strength-increasing and stability-increasing measures that are necessary to increase the performance of the motive-power rail vehicle result in a mass increase at the push-pull bars, thus having a negative impact on the overall mass balance of the vehicle. It is desirable, however, to reduce the mass, if possible. Another problem is that only a very limited installation height is available for the dimensioning of such a reinforced push-pull bar and for its installation. Furthermore, it is a drawback that the elastomeric members of the conventional joints, which are provided with a defined elasticity, change their properties due to environmental influences, oil, cleaning agents and oxidation. Other stable joint members such as, radial bearings, cannot be employed because they reduce the elasticity of the connection between bogie and vehicle body in a disadvantageous manner. A high elasticity of this articulation between vehicle body and bogie, however, is desirable because therewith the inducement of bending vibrations in the vehicle body can be reduced, the resulting vertical accelerations and the dynamic load on the members in the vehicle body can be reduced, and the riding comfort in the engineer's cab can be increased.
The approach for the solution to this problem is the attempt to design a push-pull bar made of composite fiber materials.
In German Patent document DE 29 51 111 A1, a composite member is described as a connecting rod for internal combustion engines, wherein a connecting rod shaft is disposed between two bearing eyes. A strap made of synthetic resin-impregnated fiber strands is placed around this arrangement. The connecting rod shaft is comprised of two U-shaped sections whose backs are facing one another and which are compression-mold
REFERENCES:
patent: 3362252 (1968-01-01), Ditlinger
patent: 4183261 (1980-01-01), Eiselbrecher et al.
patent: 4300410 (1981-11-01), Raghupathi et al.
patent: 4414860 (1983-11-01), Brunsch et al.
patent: 4665834 (1987-05-01), Van Iperen
patent: 4841801 (1989-06-01), Tice
Mohr Hartmut
Rudolph Ulrich
Schahl Wolfgang
Spur Gunter
Weichelt Peter
ABB Daimler-Benz Transportation (Deutschland) GmbH
Morano S. Joseph
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