Volume 15 Issue 08, August 2025
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6.995, 2024 7.75
http://www.internationaljournal.co.in/index.php/jasass
144
METHOD FOR CALCULATING THE SUSPENSION MECHANISM OF A
UNIVERSAL ENERGY VEHICLE
Komilov Mukhriddin Raqibbek ugli
,
Assistant, Andijan State Technical University
Department of "Transport Engineering"
Abstract:
This work is dedicated to calculating the lifting force of the suspension mechanism
based on its kinematic diagram. The calculation analyzes two main states of the mechanism: the
conditional working state (CWS) and the upper extreme position (U), determining the forces and
moments under load step by step. Considering the maximum lifting force in the upper position of
the mechanism, the number and type of hydraulic cylinders are selected. This ensures the
mechanism's load-bearing capacity (3.5 tons). Additionally, the line of action of the hydraulic
cylinder is determined through kinematic analysis.
Keywords:
suspension mechanism, kinematic diagram, lifting force, hydraulic cylinder, working
position, moment analysis
Introduction.
The lifting force of the suspension mechanism is calculated by sequentially
determining the forces and moments in the joints of the links for a load applied at a conditional
point (center of gravity) in the kinematic diagram (Fig. 1).
In this case, the calculation is performed for two positions of the suspension mechanism: the
conditional working position "CWS" (in the horizontal position of the longitudinal rod) and the
upper extreme position "U," since in the lower extreme position "L" the applied force arm is
relatively small, therefore its lifting force is less than in the previous positions.
The universal power unit is designed for a suspension mechanism with a lifting capacity of 3.5
tons (34.34 kN). Based on the maximum lifting force obtained in two cases, the number and
model of hydraulic cylinders to be installed are selected. In this case, the line of action of the
hydraulic cylinders is determined through kinematic analysis of the suspension mechanism.
The calculation of the lifting force of the suspension device is performed based on the kinematic
diagram of the suspension mechanism for the upper extreme position "B."
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Figure 1
. Kinematic diagram of the suspension mechanism
The resistance moment
M0
at the
O
hinge of the
OMN
longitudinal rod is equal to [17]
М
G
L
M
=
0
,
(1)
where:
L
- is the load arm
of GM
relative to
the O
hinge.
The force
Pk
applied to point
K
perpendicular to the segment
OK
is equal to
OK
M
P
K
0
=
,
(2)
KB
force
Pp
acting in the direction of inclination
a
cos
=
K
p
P
P
,
(3)
where
α=φ - 90°
is the angle between the
KB
inclination direction and the perpendicular to the
longitudinal tension segment
OK.
From the triangle ΔOBK according to the law of cosines
j
cos
2
2
2
2
-
+
=
KB
OK
KB
OK
OB
,
from this
KB
OK
OB
KB
OK
-
+
=
2
arccos
2
2
2
j
Force
PB
(component of
Pp)
acting at point
B
perpendicular to the opposite direction of the turning
lever
CB
b
cos
=
p
B
P
P
,
(4)
where
β=90° - γ
is the angle between the
KB
inclination direction and the perpendicular to the
turning lever
CB; γ
is the angle between
KB
inclination and
CB
turning lever where
β=900 - γ
-
angle between the direction of inclination
KB
and the perpendicular to the turning lever
CB;
From the triangle ΔCBK based on the law of cosines
KB
CB
CK
KB
CB
-
+
=
2
arccos
2
2
2
g
The resistance moment
MC
at the
C
hinge of the
CB
turning lever is determined as follows:
CB
P
M
B
C
=
.
(5)
The required lifting force
PP
applied to
point A
of the
CB
turning lever
PP
in the direction of the
hydraulic cylinder
force
h
M
P
C
П
=
,
(6)
where:
h
-
C
is the
PP
arm relative to the hinge.
Δ
CAE
, based on the sine theorem, the following ratio is obtained
y
sin
sin
h
E
CA
=
,
from this
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146
(since =90o),
where
ψ
-
PC
is
the angle between the direction of force action and
the CB
turning lever
Δ
CAC
from the triangle according to the cosine theorem
y
y
sin
sin
sin
=
=
CA
E
CA
h
(чунки
E
=90º),
The force generated by the hydraulic cylinder
P
C
is determined by the following relationship:
,
where
p
f
- pressure of the fluid in the line, MPa;
D
- cylinder diameter, m.
Based on the maximum lifting force, the number of hydraulic cylinders to be installed
n
C
is
determined:
89
,1
Ц
=
=
P
P
n
n
Ц
.
(7)
We select two
C100
hydraulic cylinders for the suspension mechanism, with a total force of
2PC100
=
264.4 kN, which is PP =232.73 kN ΔPC =13.67 kN (5.87%) greater than the calculated force.
Conclusion. Thus, a method for calculating the mounting mechanism of a tractor with increased
load capacity has been proposed. Based on this, the force and resistance moments in the hinged
joints of the tractor's suspension mechanism links were determined. As a result of the
calculations, it was shown that with the help of two C100 hydraulic cylinders, it is possible to lift
a load of 3.5 t placed at the conditional point MN of the kinematic scheme of the HOT.
References
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and Equipment for Rural Areas. -2010. - No. 10. - pp. 13-16.
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