OFF-ROAD CAPABILITY IMPROVEMENT OF MAZ-AUTOMOBILE HAVING AGRICULTURAL MODIFICATION

The paper contains requirements to parameters of an automobile being designed with axle arrangement 6x4 and technically permissible mass of 25 tons with its all year round operation in agricultural industry with the purpose to ensure in-time load transportation and technological cycle in crop production of the agricultural complex in accordance with time schedule of the executed mechanized works. The future automobile should also have a power takeoff device.

The paper presents operation chart flowsheets for cultivation of main crops on mineral and peat soils with indication of automobile motion modes and type of transported loads. Specific properties of peat-bog soils are given in the paper. The paper considers off-road capability of mobile machines when they are moving on soils with low bearing capacity. The paper indicates field applications of automobiles with limited and high off-road capability. Description of wheel interaction with bearing surface area, values of soil resistivity after multiple automobile passages have been given in the paper.

The paper specifies values of rolling resistance coefficient and adhesion coefficient of the automobile undercarriage systems in spring and autumn for wheeled and crawler units. Schemes of the automobile front axle drives (electric, hydraulic, mechanical) and their characteristics have been analyzed in the paper. An elastic flexible drive with separation of flow power has been proposed for reduction of dynamic loads in a power transmission drive. The paper describes a drive system of auto-analogue steering wheels with hydraulic hydrostatic drive which is located within a front wheel hub that ensure additional thrust. Recommendations for MAZ-automobile modernization with axle arrangement 6x4 have been given with the purpose to improve its off- road capability.

Metallic anti-skid chain, segment and small link, track and crawler chains, wideners have obtained a wide application for improvement of automobile off-road capacity in various soil preparations. The paper notes the conditions required for provision of the automobile off-road capacity.

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