Agricultural Tractor’s Tire Resistance Due to the Deflection and It’s Influence on Traction on Road and Firm Soil

Abstract

The paper discusses in what degree the usage of agricultural tractor tires with lower rolling resistance can benefit in traction. The component of the rolling resistance due to deflection that depends on tire design characteristics and that considerably easy can be measured is analyzed. The resistance of tires due to the deflection, for tires made by different manufacturers, was determined experimentally. Using numerical traction model, influence of measured values on the tractor’s tractive performance was analyzed. Obtained results show significant difference of deflection resistance for different tires and imply that tire selection for tractors mainly used for transport on road or firm soils can be based on selection of tires with lower rolling resistance. This can be significant for our practice where agricultural tractors are widely used for transport.

U radu se utvrđuje u kolikoj meri korišćenje pogonskih pneumatika poljoprivrednog traktora sa manjim otporima kotrljanja može da dovede do poboljšanja pokazatelja vuče. Prvenstveno se razmatra defleksioni otpor, komponenta otpora kotrljanja koja je direktno uslovljena konstrukcijom pneumatika i koju je relativno lako izmeriti. Eksperimentalnim putem su određeni defleksioni otpori pneumatika dva proizvođača, te je numeričkom analizom utvrđen njihov uticaj na pokazatelje vuče traktora. Dobijeni rezultati su ukazali na značajne razlike ovih otpora, te da je izbor pneumatika traktora pretežno namenjenih za kretanje po tvrdim podlogama moguće svesti na izbor pneumatika sa najmanjim defleksionim otporima. Ovo se može smatrati naročito značajnim u našim uslovima gde je eksploatacija poljoprivrednog traktora u velikoj meri vezana za korišćenje traktora za transport po tvrdoj ili sabijenoj podlozi.