Car Body Joint
Rubber-metal ball joints or spherical bearings used as car body joints combine mechanical robustness with high mobility and contribute significantly to the driving stability, safety and durability of railway vehicles. Depending on the application, they can be customized in terms of installation and performance characteristics to meet operational loads.
Area of application
A car body joint is a key connecting element between the car bodies of multi-unit railway vehicles, such as articulated railcars, trams or light rail vehicles. It enables safe passage between the vehicle segments while also ensuring the necessary freedom of movement required when traveling through curves, switches or over track irregularities. Through this function, the car body joint makes a decisive contribution to the stability, flexibility and comfort of the entire vehicle. The rubber-metal element plays a central role in the function of the car body joint.
Technical details
From a technical standpoint, a car body articulation consists of a combination of mechanical rotational and pivoting joints, which are often supplemented by elastic elements. The elastic element is typically a rubber-metal ball joint or a spherical bearing with specially designed metal parts vulcanized to the inner and outer surfaces. This design allows for controlled relative movements between the car bodies: horizontal rotational movements for cornering, vertical movements to compensate for superelevation and slight roll angles when encountering track irregularities.
Characteristics
Key characteristics of a car body joint include its high load-bearing capacity, fatigue strength and operational reliability. The design must absorb large dynamic forces resulting from cornering, braking and chassis dynamics without causing excessive stiffness or some play. The rubber-metal element in the car body joint serves to reduce the transmission of noise and vibrations between car modules through targeted damping properties, thereby extending maintenance intervals and ensuring reliability.