22
EUROCARGO Euro 6
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CHASSIS INTERVENTIONS
CHASSIS INTERVENTIONS
2.6
INSTALLING THE TOW HOOK
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Printed 603.95.747
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1st Ed. - Base 12/2013
Towing hooks for conventional trailers
According to Directive 94/20/CE, both for the choice of the hook and for the application of any reinforcements to the rear cross-
bar, it is important to take into account the action of the horizontal forces generated by the masses of the tractor and trailer, based
on the following formula:
D = 9.81 (T • R) / (T + R)
D = representative value of drawbar class [kN]
T = maximum mass of the tractor [t]
R = maximum mass of trailer with mobile vertical drawbar [t]
Drawbar couplings for centre axle trailers
Centre axle trailers are defined as those that have the drawbar rigidly connected to the frame and the axle (or more close axles)
placed at half the length of the same chassis.
Compared to the articulated drawbars, the rigid drawbar acts on the drawbar coupling with the increase of the static vertical loads
and, in the braking phase or in the oscillations caused by the road surface, the increase of the dynamic vertical loads. By means of
the hook, these loads lead to increases in the torsion of the rear crossbar of the vehicle, as well as push-ups on the overhang.
The use of centre axle trailers therefore requires the use of suitable towing hooks.
The values of the towed weights and vertical loads allowed are listed on the technical documents of the drawbar coupling manufac-
turer and on the part manufacture plate (see DIN 74051 and 74052).
Towing hooks that bear special approvals and with values greater than those listed in the above standards may be used. However,
these towing hooks may pose restrictions in relation to the type of trailer used (e.g. drawbar length); In addition, the drawbar may
require reinforcement for the towing vehicle as well as larger counter chassis profile section.
For mechanical coupling devices for trailers with a central axle, refer to the following formulas:
D
C
= g (T • C) / (T + C)
V = a • C (X
2
/ L
2
)
D
C
= representative value of drawbar class [kN]. This is defined as the determination of the theoretical reference value for hori-
zontal load between tractor
g = acceleration of gravity [m/s
2
]
T = maximum weight of tractor
R = maximum weight of trailer
S = value of vertical static load that, in static conditions, is transmitted to the coupling point. S must be
≤
0.1 x R
≤
1000 kg of the
trailer
C = sum of maximum axial loads of the centre axle trailer at full load It is equal to the maximum mass of the trailer decreased by
the vertical static load (C = R - S)
V = value of the theoretical dynamic vertical load [kN]
a = vertical acceleration in the area of the drawbar coupling/hook. in function of the rear tractor suspension, use the following
values:
●
a = 1.8 m/s
2
of air suspension
●
a = 2.4 m/s
2
for other types of suspension
X = length of the load bed [m], (see Figure 2.10)
L = theoretical drawbar length, distance between the centre of the drawbar eye and the centre line of the trailer axles [m], (see
Figure 2.10)
X
2
/ L
2
≥
1 if the result is less than the unit, use the value 1
Содержание EUROCARGO
Страница 1: ...EUROCARGO EURO 6 M E D I U M R A N G E BODYBUILDERS INSTRUCTIONS ISSUE 2013 ...
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Страница 9: ... Printed 603 95 747 Base 12 2013 SECTION 1 GENERAL INFORMATION ...
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Страница 28: ...20 EUROCARGO Euro 6 GENERAL INFORMATION GENERAL INFORMATION Printed 603 95 747 1st Ed Base 12 2013 ...
Страница 29: ... Printed 603 95 747 Base 12 2013 SECTION 2 CHASSIS INTERVENTIONS ...
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Страница 91: ... Printed 603 95 747 Base 12 2013 SECTION 3 APPLICATIONS OF SUPERSTRUCTURES ...
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Страница 135: ... Printed 603 95 747 Base 12 2013 SECTION 4 POWER TAKE OFFS ...
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Страница 161: ... Printed 603 95 747 Base 12 2013 SECTION 5 ELECTRONIC SUB SYSTEMS ...
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Страница 215: ... Printed 603 95 747 Base 12 2013 SECTION 6 SPECIAL INSTRUCTIONS FOR SCR EXHAUST SYSTEM ...
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