Conveyor roll assembly, torque transmission and support means and process for making a conveyor roll assembly used in a high temperature environment

A conveyor roll assembly for use at high temperature comprising

• a) a ceramic spool having a first end and a second end, a flexural strength of at least 15 MPa and an external diameter D and at least the first end of the ceramic spool has an axial, centered bore of a diameter d, and a depth Dd≤1.5 d and,
• b) a torque transmitter and support having a general cylindrical shape, having a longitudinal axis, being provided at least partially in the bore of the ceramic spool, and having a supporting end and a connecting end disposed distally to the supporting end, the torque transmitter and support comprising a body and
• b1. a supporting portion, located at the supporting end, that is substantially not deformed and is configured to support the spool from the inside, comprising at least two cylindrical supporting surfaces and,
• b2. a connecting portion, located at the connecting end, that is mechanically and resiliently deformed by the introduction of the torque transmitter and support inside the ceramic spool,
• said connecting portion being capable of returning to its original shape when the torque transmitter and support is removed from the ceramic spool,
• said connecting portion comprising at least two distinct connecting surfaces, frictionally connecting the torque transmitter and support to the ceramic spool,
• wherein the connecting portion is arranged between two cylindrical supporting surfaces and the diameter of the center bore of the ceramic spool is 10 mm≤d≤¾ D.