35
Figure 2- 14- Vertical force on the disc coulter
for different disc angles, tilt angle=15
Figure 2- 15- Vertical force on the disc coulter for different
disc angles, tilt angle=20
Figure 2- 16- Vertical force on the disc coulter for different disc angles, tilt angle=25
-10
40
90
140
0
7
14
21
28
Ver
tical
Fo
rc
e
(
N
)
Disc Angle (Degrees)
Tilt Angle-15
0
20
40
60
80
100
120
140
0
7
14
21
28
Ver
tical
fo
rc
e
(
N
)
Disc Angle (Degrees)
Tilt Angle-20
-10
40
90
140
0
7
14
21
28
Ver
tical
Fo
rc
e
(
N
)
Disc Angle (Degrees)
Tilt Angle-25
36
2-5-3- Lateral Force:
Unlike
vertical force, lateral or side forces seem to be more predictable. Obviously
increasing the disc angle will increase the lateral force; because with a non-zero disc angle, the
system becomes asymmetrical, which results in a higher lateral force in some angles. But when
we use tilt angle to form a compound angle, it may help to reduce the lateral force. This effect
can be seen in Figure 2-18, 2-19 and 2-20 compared with 2-17. The reason for the reduction in
the lateral force in the presence of tilt angle can be explained the same as the draft force. A
compound angle disc instead of pushing and pressing the soil to the side, it lifts
up the soil and
displaces it to the side. This will result in lower lateral force as well as lower draft force at some
angle combinations.
As it
mentioned for vertical force, these data
are used in the design section, when we
have chosen a specific disc and tilt angle. Thus, for the 7º disc angle and 25º tilt angle, lateral
force which is equal to 760 N.
Figure 2- 17- Lateral force on the disc coulter for different disc angles, tilt angle=0
0
200
400
600
800
1000
1200
0
7
14
21
28
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