PLEASE NOTE: THIS IS HAUSER GERMANY MANUAL.
FOR USA NOMENCLATURE PLEASE GOTO PARKERMOTION.COM
Mounting / Repair
29
5.2.3 Tensioning the timing belt
5.2.3.1 Fundamentals
Note
The timing belt pre-tension must be adapted to the operating loads, however it may
not exceed the maximum permitted values for setting the tension stated in Table 1
5
.
The timing belt tension to be set depends on the force required to be transferred by the timing
belt Fx (Fx = Fdynamic)
In order to stop the timing belt jumping, the timing belt pre-tension (operating tension) must be
approximately 10% above the force to be transmitted Fx.
In the case of new or old slackened timing belts, the pre-tension will reduce by about 20% a
short time after first being tensioned. Therefore on tensioning the belt, a tension should be set
which is approximately 1.25 times the operating tension. This tension is defined in
Table 9
as
the tension to be set .
Here in
Table 9
, a differentiation is made between standard values and the maximum permitted
values which are based respectively upon different statements of operating life for the drive
system.
Standard value
Maximum permitted values
Service life
20.000 hours
6.000 hours
Average speed
1,5 m/s
1,5 m/s
Table 8:
Service life used as a basis for drive units
For this reason, the standard value should be set first of all if the application allows. If at the
standard value set, the upper and lower timing belt touches, then the belt tension should be
increased in stages until the belt can no longer touch. The belt tension may not, however,
exceed the maximum permitted value from
Table 9
.
In the case of dual actuators, if the load is applied symmetrically between the actuators, the belt
tension can be halved.
If the tension of a timing belt which has been in operation for more than a week is less than
0.9 x the operating tension, then the timing belt tension must be increased to 1.1 x operating
tension (
Table 9
).
Note
HPLA systems are already pretensioned at the respective standard value when
supplied.
5
If you want to exceed these values, please contact Parker.
