The Jörn rubber pressure spring consists of a stable base and top plate as standard. Between these there are several rubber layers separated by sheets. Depending on the type of load, the compression spring can taper upwards like a trapezoid. The upper plate is either screwed to the leaf spring end or the leaf spring end rests loosely.
Compression springs of this type are often used in heavy-duty trucks, for example construction site vehicles as leaf spring end bearings.
Emergency or auxiliary springs can also look similar in bogies of trains. These can now also be offered in a fire protection mixture certified according to DIN EN 45545.
compression spring with integrated stop
This Jörn invention of a compression spring reduces the spring travel and offers a higher load capacity with the same installation space:
A steel bolt in the rubber compression spring ensures a high level of overload protection. It offers a very compact end stop in all directions. The more compact stop construction compared to the competition creates space for more rubber and thus increases the load capacity of the compression spring with the same external dimensions. The reversal, namely less installation space with the same load capacity, is of course just as possible.
Due to the eccentric positioning, the leaf spring is supported more strongly on one side than on the other. This counteracts the equally asymmetrical load. This construction further increases the robustness and thus the service life of the rubber compression spring.
The steel bolt in the rubber compression spring causes a very progressive spring characteristic. It thus serves as overload protection in the vertical direction. At the same time, it limits the displacement in both horizontal directions.
The compression spring with integrated stop is a Jörn development and patented.
developing process of rubber metal parts
Now part 2 of the development process of rubber metal parts from the new series: SECRETS OF JÖRN GMBH, from simulation to FEM and first samples, to the release of serial parts. Among other things, Mr. Reinke also discusses the special characteristics and pitfalls of rubber materials and their effect on development and testing.