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INTRODUCTION
PRELIMINAR STUDIES AND CONSIDERATIONS
MOUNTING AND CONSTRUCTION
A.2.4
Coupling device calculation
The size of the coupling device is determined with respect to value D, which repre-
sents the theoretical horizontal force between the drive vehicle and trailer.
The terms used in the calculation of value D to determine the proper coupling device
are:
TERMS USED IN THE CALCULATION OF THE COUPLING DEVICE
Nom.
D
Value of the theoretical horizontal force between the
drive vehicle and the trailer.
DC
Reduce value of D for rigid drawbar and central axle
trailers.
T
Technically permissible maximum mass of the drive
vehicle.
R
Technically permissible maximum mass of the trailer.
C
Sum of the axle loads of the centre axle trailer.
U
Fifth wheel imposed vertical load.
g
Acceleration due to gravity (assumed as 9.81 m/s²)
V
Value that is defined as the theoretical reference force
for the amplitude of the vertical force between towing
vehicle and centre axle trailers having a maximum mass
exceeding 3,5 tons.(The V-value is taken as a basis for the
vertical test loads in the dynamic tests)
a
Equivalent vertical acceleration in the coupling point.
X
Length of the loading area of the trailer.
l
Distance between the centre of the drawbar eye and the
centre of the axle assembly.
2
Must be ≥ 1.0 (If the result is a value used should be 1)
l
F
Distance from the front axle to the centre of the fifth
wheel.
Table 1-195 LCV_SPBTA2_001 Terms used in the calculation of the coupling devices
For mechanical coupling devices unsuitable for transmitting vertical bearing
loads
8)
For mechanical coupling devices for centre axle trailers suitable for transmitting
vertical bearing loads
9)
DC = g *
272
POWER TAKE-OFF
Description
T
R
*
D = g *
T + R
T * C
10)
(kN)
T + C
Body Builder Manual Part II, Specific Book LCV
MAINTENANCE AND DAMAGE PREVENTION
ELECTRIC AND ELECTRONIC SYSTEMS
(kN)
2
X
V = a *
* C
2
l
WORK ON BASIC VEHICLE
Units
kN
kN
ton
ton
ton
ton
m/s²
- -
m/s²
m
V1.0, February 2015
APPENDIX
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