CHIARAVALLI
LOAD CONDITION
OPERATING CONDITIONS
TYPE OF DRIVE
COUPLING SIZE SELECTION INSTRUCTIONS
29
The torque, speed and useful working life data declared for the couplings are to be understood as valid referred to a
Service Factor SF = 1.
The service factor must be determined therefore, based on the type of load, the load intensity and the range factor that
characterises the type of load exerted on the coupling.
The values shown in the following table can be considered as a precautionary measure in the absence of reliable service
factor design data.
electric motor
diesel engine
UNIFORM
Regular operation without impacts or overloads
1,25
1,5
LIGHT
Regular operation with minor and infrequen
impacts and overloads
1,50
2,0
MEDIUM
Irregular operation with medium overloads for a short
duration and frequent but moderate impacts
2,0
2,5
HEAVY
Markedly irregular operation with very frequent
impacts and overloads and of major intensity.
2,5
3,0
Use the following formula to calculate the value of the
operating torque (Me) expressed in Nm, considering
the drive motor power output (P) in kW and the opera-
ting speed (n) in r.p.m.
Me = 9549 x P
n
Establish the nominal torque to be transmitted (Mn) ba-
sed on the service factor taken from the table.
Mn = Me x FS
Select the coupling with a nominal torque which is
GREATER than the value calculated.
WARNING
The declared nominal torques must be progressively
decreased for angular misalignments that exceed 0.125
degrees.
Check that the largest of the shafts to be connected
has a diameter equal to or less than the nominal bore
declared for the coupling.
The maximum permitted diameter for the selected
coupling should be limited to UNIFORM or LIGHT load
conditions.
CHIARAVALLI GROUP
BRAND
GIFLEX
®
COUPLING SIZE SELECTION INSTRUCTIONS
TEST BASED ON THE POWER TO BE TRANSMITTED
TEST BASED ON THE SHAFT DIAMETER
12