RESEARCH OF BRAKING PROPERTIES OF WHEEL FORWARDER 8×8

Abstract

The operating conditions of wheeled forwarders have been considered. The requirements for the efficiency of the braking system are described, as well as methods for testing the working and parking braking systems of wheeled forestry machines when operating on ups and downs of up to 50%. The most severe brake loading situations in terms of keeping the forwarder on a slope have been shown. A calculation scheme for determining the loads in the contact patch during the descent of a wheeled forwarder has been drawn up. The initial data necessary for calculating the braking system of the machine have been given. The results of calculations of reactions when the forwarder is located on a horizontal support surface and the calculation of reactions in the contact patch of the wheel during descent and ascent are given. The technical parameters of the braking system of the NAF TAP 7601 balancer axles used on the developed machine have been presented. The results of calculations of the braking properties of the forwarder in running order and at full weight on the descent (characterized by the parameters α = 40% and α = 50%, as well as on the ascent α = -50%) have been presented. The results of calculations of the required braking torque on the wheels of the machine, the maximum-realized braking torque for the adhesion of all wheels of the front and rear axles of the machine have been presented. The safety factor of braking mechanisms and the safety factor for adhesion have been given