Abstract
One of the most important parameters that characterize the traction-coupling properties of a wheeled tractor is its slip. The more tractor’s gross traction exists, the higher its traction-coupling properties are. However, this gross traction should not exceed its maximum possible value, which, in turn out, is to be determined by the maximum permissible slip, δmax. This article provides the equation to calculate this crucial parameter and establishes the dependencies between the tractor’s slip and soil structure coefficient. It was shown that the value of δmax basically depends on such soil characteristics as the bulk deformation coefficient and the coefficient of rolling resistance. Calculations showed that, for the average value of the soil bulk deformation coefficient at 4000 kN·m−3, the average value of rolling resistance coefficient at 0.16, and the ratio value of the maximum permissible soil pressure to the tractor wheel rolling radius at 222 kPa·m−1, the maximum permitted amount slip of the tractor wheels should not exceed 15%. With more slip, the soil structure deteriorates significantly. In this case, its structure coefficient may be less than critical, equal to 0.4.
Highlights
The drive wheel’s main rolling problem is to provide it with a large traction force due to the high adhesion of its tire to the supporting surface
Analysis of Equation (1) shows that the slip of the tractor wheel depended on only one constructive parameter of a tractor—the rolling radius of the wheel Rk
One of of the the most most important important parameters parameters that thatcharacterize characterizeaawheeled wheeledtractor’s tractor’s tractiontractioncoupling properties is its slip when operating in a particular machine-tractor unit
Summary
The drive wheel’s main rolling problem is to provide it with a large traction force due to the high adhesion of its tire to the supporting surface. The action of the following forces causes the adhesion of the drive wheel tire to the soil: (i) frictional forces between the soil and the tire’s supporting surface; (ii) the force generated by the pressure of the tire vertical lug side on the soil; (iii) the force acting along the tire-soil contact surface located between lugs The impact of these forces is accompanied by the displacement (sliding) of the wheel’s tire relative to the soil, commonly called slip. The circumferential deformation of an elastic pneumatic tire is caused by the torque applied to the wheel The latter causes the wheel hub to turn at some angle relative to that part of the tire that is in contact with the soil. In practice, this slip is most often determined together with slip δs
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