초록 ▼

A back-up bearing arrangement (25) for a magnetic bearing (12, 13) includes a stationary dry running bearing material (30) and a rotable collar (26) which runs in abutment where with upon failure of the magnetic bearing. To avoid adhesive wear due to localised welding or melting of bearing material

A back-up bearing arrangement (25) for a magnetic bearing (12, 13) includes a stationary dry running bearing material (30) and a rotable collar (26) which runs in abutment where with upon failure of the magnetic bearing. To avoid adhesive wear due to localised welding or melting of bearing material at surface asperities because of the inability of collar material (chosen to withstand centrifugal stresses at high rotation rates) to remove it adequately, the contact-making face of the collar is plated with a layer of copper on which is deposited a thin layer of titanium nitride.

대표청구항 ▼

A back-up bearing arrangement for a high speed magnetic bearing comprising a stationary dry running bearing material, comprising a metallic matrix loaded with a dry lubricant, and a rotatable load bearing, thermally conductive collar having at least one surface region arranged, in operation of the a

A back-up bearing arrangement for a high speed magnetic bearing comprising a stationary dry running bearing material, comprising a metallic matrix loaded with a dry lubricant, and a rotatable load bearing, thermally conductive collar having at least one surface region arranged, in operation of the arrangement, to run in abutment with the dry running bearing material, each said surface region of the collar being coated with a layer of metal having a higher thermal conductivity than the collar material and a thin layer of hard wearing ceramic material deposited on said layer of metal.