Technical Manual - Plastorgomma Service

Construction
Tension Cord
As on standard belts, the tension cord consists of continuous,
spirally wound glass fibre. This material ensures high tensile
strength with the minimum stretch. Exceptional flexibility is achieved
by embedding it centrally.
Teeth
The teeth are arranged directly opposite each other and are
manufactured from a medium hard, shear and wear resistant
rubber compound. They mesh exactly with the tooth pitch of the
pulley with the minimum resistance. As long as 6 teeth or more are
in mesh, their strength usually exceeds the tensile strength of the
tension cord.
Fabric Cover
Both sides of the teeth are covered with a tough, friction resistant
fabric giving an effect similar to the protective surface-hardening
applied to gears. After an extended running period the surface of
this protective fabric, which has a low coefficient of friction,
acquires a polish, ensuring a longer life.
Design Hints
Double sided timing belts to ISO 5296
Drive Design
The protective covering on both tooth faces and the resultant
identical power transmission capability of both sides of the belt,
means that the distribution of the power to be transmitted is not
inhibited. The maximum permitted nominal power rating can be
transmitted from either the inner or the outer tooth face. With
several driven pulleys the power can be distributed in any combination
through both sides of the belt. The total power transmitted
cannot, however, exceed the maximum permitted levels.
Example:
The design must be based on the nominal power values for
standard belts (see pages 20 – 29). For the sizes available see
pages 6 to 8.
31