Lubrication-free shaft specialist at high load.
The front loader test rig is part of the 2,750 sq.m. large test laboratory for motion plastics®.
The aim of this set-up is to test various plain bearing/shaft combinations for the agricultural and construction machine sector under practical conditions.
Each test examines various combinations in a direct comparison. This makes it possible to test various iglidur® materials on one side, and metallic bearings on the other.
Thus, the test rig allows us to compare existing customer solutions (such as steel bushings, metal-rolled bearings with Teflon coating, bronze bearing, etc.) in the real application with maintenance-free iglidur® plain bearings.
The results are not only important with regard to front loaders, but can also be transferred to other applications in the heavy load sector. Similar parameters can generally be found in all applications which are driven by a hydraulic cylinder.
We would be happy to offer you a test for your plain bearing application. According to the required parameters, of course, further test rigs are available to test the application as close to real conditions as possible.
|Tank||Volume flow rate||Operating pressure||Motor||Control system|
|300 l||66 l/min||220 bar max.||11 kW||PLC controlled with 10" touch display|
|Drives||Vibration operation||Max. load||Vmax|
|Single trip||Simple||500 kg (freely selectable)||4 cycl. /min at full pivot|
|Single trip combined||Multiple|
Pivot angle: 55°
Load: 22 MPa
Pivot angle: 48°
Load: 29.5 MPa
Pivot angle: 7°
Load: 29.5 MPa
The lowest wear rate here is the combination of the plain bearing material iglidur® Z with a hard-chromed CF53 shaft. The iglidur® Q290 material offers a cost-effective 100% corrosion-free solution in combination with a 304 stainless steel shaft. These test results also reflect our practical experience.
The test with the lubricated steel bearing was terminated prematurely as the system began to seize.
The iglidur® J material shows consistently good results. Notwithstanding that this material has the lowest permissible surface pressure of all the materials tested here! In addition, a good example with regard to metallic bearings: "hard" does not mean wear-resistant at the same time! As in the test "Bearing point 1", the test with the lubricated steel bearing was also discontinued in this experiment.
The images of the test combination iglidur® Z on hard-chromed shafts show no damage or run-in traces.
Although the sliding path is lowest due to the lowest pivot angle of 7° at this bearing location, the experiment with the lubricated steel bushings was discontinued early. One reason could be that the situation of a lack of lubrication can occur even faster at smaller pivot angles. We will test this in further experiments.
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