Material
ZX-324V2T

Description of the application
The bushing showed here is built in several places in the articulated arms of the truck tail-lift.

Load
The maximum surface pressure of the plain bearing bush is 120 N/mm², the speed is 4 rpm in combination with the ingress of dirt, water and road salt in the bearing area.

Problem
Since it is a welded structure, in the bearings geometry results errors, which carry to extremely high edge pressures. Maintenance-free, dry running conditions, and quietoperations were also required. A tested composite of epoxy resin and PTFE proved to be as unsuitable (Fracture).

Problem-solving
In the articulated arms of the truck tail-lift cylindrical bushings made of ZX-324V2T, having an inner diameter of 30 mm, an outer diameter of 36 mm and a length of 30 mm are now installed.

Working life
25.000 load cycles as required. Afterwards 25.000 load cycles in the test stand, the bushing was still fully functional. Since 1996 it has been used as standard feature.

Advantages
The application works maintenance-free, there is no need for the greasy lubrication. The material supports high surface pressures.