CHIARAVALLI
TIMING PULLEYS
with PILOT BORE
FOR SYNCHRONOUS DRIVES
Toothed belts and pulleys are of major importance in synchronous
drives based on flexible components.
These components enable problems to be overcome efficiently
and very economically, problems that would otherwise require the
use of kinematic motion gearing or transmissions with articulated
link chains.
In fact, the performance provided by synchronous belt drives is
analogous to the characteristic performance of both chains and
gearing however belts and pulleys by comparison have additional
advantages deriving from their structural features.
This evident versatility in application is essentially due to the ope-
rating characteristics that are common to all toothed belt synchro-
nous drives, and they can be summarised as follows:
- Transmission of absolute asynchronous motion due to the com
plete absence of slipping.
- Regular and constant motion, since the toothed belt is free
from polygonal winding and the consequent speed variation
typical of chain transmissions.
- Non-extendable belt that transmits the motion without
significant stretching and therefore without lost motion.
- Moderate assembly pre-tension, since adhesion is not required
between the belt and the pulley.
- Minimum radial load on the shafts and on the bearings.
- High capacity to transmit power and high torques at low speed.
- Silent running, good performance, minimum overall dimensions
and limited maintenance requirements.
The quality of synchronous transmission depends to an equal ex-
tent on the characteristics of both the belt and the pulley, which
therefore must comply with demanding design and construction
criteria.
CHIARAVALLI GROUP SpA avails of the technical collaboration
of the most qualified manufacturers of belts worldwide and
produces the Company’s complete range of toothed pulleys in
compliance with current Standards, but implementing a series of
adjustments designed to improve the matching characteristics
with the belt.
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