The relative merits of pneumatic tyres and conventional steel tracks used on agricultural tractors are studied and a case made for the potential of rubber tracks to combine the advantages of both. Two experiments are reported where the tractive performance of rubber tracks was compared with that of tractor drive tyres.

The first was a comparison between a friction drive rubber track of simple construction mounted in a test vehicle, and a conventional radial tractor drive tyre. The track produced about 25% more pull than the wheel.

The second experiment was a comparison between a small dumper truck running on rubber tracks and a conventional tractor of similar weight. This showed that adequately supported rubber tracks could produce performance characteristics similar to those of steel tracks. The truck produced twice the pull of the wheeled tractor at similar tractive efficiencies and caused much less rutting on a soft soil.

Abstract（2）

Traditionally, tractors have been built either for tracks or wheels, with tracks mainly on heavy tractors with high power. Today, it is possible to retrofit four separate track units on a conventional agricultural tractor, creating interesting possibilities for agriculture. The objective of the present study was to compare soil compaction and traction for tracks, single and dual wheels mounted on the same tractor type.

Measurements were made on two clay soils (Eutric Cambisols) in Sweden in 2009, using an 85 kW tractor with a total weight of 7700 kg. The rubber track system consisted of four tracks mounted on the conventional wheel axles of the tractor. The measured stresses were similar for the tracks and dual wheels at all depths studied (15, 30 and 50 cm), but were considerably higher for the single wheels at all depths. Simulations of soil stresses correlated closely to measured values for the tracks and the dual wheels, but underestimated soil stresses in the topsoil compared to measured values for the single wheel.

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