Leaf springs are still widely used in commercial vehicles. They are a robust alternative to air springs. In many vehicle classes, such as construction site trucks, pick-ups or vans, these are therefore very popular.
The leaf springs must be mounted movably to ensure their function. Depending on the structure and application, this is done at different points and accordingly with different bearing types. Rubber-metal components are usually used. These have largely replaced lubricated plain bearings due to various advantages. The main reason here is the maintenance-free nature of rubber-metal parts.
Leaf spring eye bearings
In the commercial vehicle, the leaf spring ends are rolled to eyes, in which the Jörn leaf spring eye bearings are used. At one end, the bushings are attached directly to the frame. On the other, an identical bushing is attached to the frame and the two bushings are connected by a short handlebar. Even with air-spring trucks, there is a Jörn leaf spring eye bearing in the rolled eye of the handlebars.
leaf spring end mounts
Construction site vehicles with tandem axles often do not have leaf spring eyes. The spring ends rest loosely on special compression springs or are screwed to them.
Special version with integrated stop
A 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. Thus, a bolt has an effect in all directions. Classically, the stops for each direction are usually integrated separately into the cover plate. Of course, this is also possible, but requires more installation space. With this special shape, you can achieve a significantly increased load capacity in the same installation space or, conversely, for the same load capacity, you can build more compactly.
leaf spring center mount
Leaf springs used in tandem axles as well as in construction site vehicles must be elastically rotatable in order to compensate for large unevenness. Depending on the application, winding bushes or the more robust flange bushings can be used here to ensure maintenance-free and durable mounting of the leaf spring.
Jörn dual bush
smart solution, easy to mount
Jörn GmbH presents further components. Today the bushing sockets, duo bushes, winding bushes and their special shapes. With the help of the duo bushing, Jörn GmbH revolutionized the assembly of stabilizers and roll supports in railway bogies and truck chassis. The duo socket made assembly faster, easier and less prone to errors, saving vehicle manufacturers a lot of money and time. In the video, special forms of the duo socket are also briefly presented.