Rullmotstånd hos dragna hjul med lågprofildäck
This investigation was performed during the summer and autumn in 1984. The purpose was to investigate factors on low profile implement tyres affecting the coefficient of rolling resistance. The following factors were studied: - inflation pressure - width - diameter - construction - ply rating - aspect ratio - tread pattern Tests wars performed on concrete, harrowed fields, ploughed fields and stubble. Important factors when reducing the CRR when driving on concrete are: - increase the diameter and width - higher ply rating - decrease in aspect ratio - less aggressive tread pattern - choice of particular constructions (Garden Tractor or Steel Belt). The most important factor in reducing rolling resistance on soft ground is to ensure that the tyre size is adequate to carry the vertical load at as low inflation pressure as possible. A big soft tyre with low inflation pressure giving no or little sinkage is desirable. Choice of aggressive tread patterns will lead to an increase in rolling resistance because of the energy losses produced by the high compaction under the lugs. The relation between diameter and width must be large enough to ensure no or a minimum of bulldozing resistance. Reducing rolling resistance will lead to a number of advantages. The low inflation pressures will cause a decrease in soil compaction, and there will be an increase in yields. Lower railing resistance will also result in savings in fuel and time.
Rapport - Sveriges lantbruksuniversitet, Institutionen för lantbruksteknik
Publisher: Institutionen för lantbruksteknik, Sveriges lantbruksuniversitet
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