Hakan VELİOĞLU, Hasan SİLLELİ, Selçuk OLUM, Mustafa KANTAŞ, Hamdi TAŞBAŞ, İbrahim ERGÜL

The Effect of Windscreen on Field of Vision in Tractors

Tractors are used in dusty and muddy conditions because of its functionality. However,apparatus using for increasing the field of vision in tractors can not eliminate the risks associatedwith these conditions. In some situations, windscreen may be entirely covered with mud and fieldof vision may be limited by the only part of the wipers sweep. Efficiency of tractor wipers areassessed according to the current regulations(in respect to the legislation issued by Ministry ofScience, Industry and Technology). “2008/2AT Type Approval Legislation related to Field of viewand windscreen wipers Agricultural Wheeled Tractors or Forestry Tractors” ( Valid in Turkey andEuropean Countries) and/or equivalent regulation “R-71 Approval of Agricultural and Forestry ondrivers’ field of vision” (valid in countries which are member of United Nations).In this study, a research was carried out on agricultural tractors equipped with a cab in accordancewith aforementioned legislation. These two tractors have different track width, and they operatedby three expert drivers. With reference to “Type Approval Regulations 2008/2/AT and 2009/66related to Steering Equipment of Agricultural Wheeled and Forestry Tractors” a special 100 meters‘S’ shaped track formed by 2 circles has been designed. Test track was formed in respect to currentregulations and average rural road and its border determined as 3 and 4 meters wide by usingpins. Trials were carried out in two different speeds; at constant speed and normal drive andwindscreen was clear and dirty. After trials, it was observed that number of pins overthrown werevariable depends on operator’s experience, track width or high clearance shape of tractor, speedand windscreen’s conditions or type. The assessment of Agricultural and Forestry Tractors in thisresearch showed the current regulations or standards cannot provide enough security. For thatreason, it was concluded that current regulations and standards should be revised in order to beable to provide enough driving security.

Anahtar Kelimeler:

Field of view, wipers, driving security

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(2008/2/AT) Tekerlekli Tarım veya Orman Traktörlerinin Görüş Alanı ve Ön Cam Silecekleri ile İlgili Tip Onayı Yönetmeliği.