Tests of the wheel interaction with the terrain for the
4WD tractor working with front-mounted loader were conducted
while driving without a load, transporting 500 kg
and 1000 kg of loads. The distribution of overall mass of
tractor with loader on the front and rear wheels, are presented
in Fig. 2. The figure shows that while driving without
a load, front/rear wheel load ratios were, respectively,
53.0%/47.0%; while transporting 500 kg of load – 61.2%/
38.4%, and while transporting 1000 kg of load – 72.1%/
27.9%. These results indicate that, for a tractor working
with front-mounted loader, weight distribution between
front and rear wheels vary within a large range. Loaded
differently, front and rear tires deform differently. Tire
deformations change the wheel dynamic radiuses. Disproportionate
change in the dynamic radiuses of the front
and rear wheels make kinematic discrepancy between driving
wheels, and the consequence is that one pair of the
wheels is forced to slip, while the other – to skid [1,7,8,26].
Figs. 3–5 show front and rear wheels’ slip/skid dependence
on tires’ pressure, when tractor is traveling without
a load, transporting 500 kg and 1000 kg of load. Fig. 3
shows front and rear wheels’ slip/skid d dependence on rear
tires’ pressure pr, when the tractor is traveling without a
load and front tires’ pressure pf is, respectively: 80; 120;
160; 200; 240 kPa.
From the dependencies shown in Fig. 3 we can see that
Tests of the wheel interaction with the terrain for the
4WD tractor working with front-mounted loader were conducted
while driving without a load, transporting 500 kg
and 1000 kg of loads. The distribution of overall mass of
tractor with loader on the front and rear wheels, are presented
in Fig. 2. The figure shows that while driving without
a load, front/rear wheel load ratios were, respectively,
53.0%/47.0%; while transporting 500 kg of load – 61.2%/
38.4%, and while transporting 1000 kg of load – 72.1%/
27.9%. These results indicate that, for a tractor working
with front-mounted loader, weight distribution between
front and rear wheels vary within a large range. Loaded
differently, front and rear tires deform differently. Tire
deformations change the wheel dynamic radiuses. Disproportionate
change in the dynamic radiuses of the front
and rear wheels make kinematic discrepancy between driving
wheels, and the consequence is that one pair of the
wheels is forced to slip, while the other – to skid [1,7,8,26].
Figs. 3–5 show front and rear wheels’ slip/skid dependence
on tires’ pressure, when tractor is traveling without
a load, transporting 500 kg and 1000 kg of load. Fig. 3
shows front and rear wheels’ slip/skid d dependence on rear
tires’ pressure pr, when the tractor is traveling without a
load and front tires’ pressure pf is, respectively: 80; 120;
160; 200; 240 kPa.
From the dependencies shown in Fig. 3 we can see that
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