Rotary Kiln Bronze Bushing for Hot Heavy-Load Trunnion

Rotary kiln trunnion bearings work under a combination of heat, heavy load and very low sliding speed. Shell temperatures commonly reach several hundred degrees Celsius, single-side bearing loads can run into hundreds of tonnes, and rotation is typically only a few revolutions per minute. Under these conditions a bronze bushing must resist deformation, keep its running clearance, and avoid seizing against the steel shaft.

Design & materials

Material selection follows the duty of the kiln. Aluminium bronze such as C95400 is often chosen for high-load trunnion areas because of its strength and resistance to oxidation, while tin bronze grades like C93200 (SAE 660) suit medium-load positions. For oil-starved or intermittent-lubrication points, graphite-plugged self-lubricating bushings can reduce reliance on external lubrication. Split bushings are available for large kilns where the housing cannot be dismantled.

• Cast to drawing or reverse-engineered from a worn sample
• Solid or split (bolted) construction for large diameters
• Oil grooves, lubrication holes and clearance machined as specified
• Material grade matched to the original part or to your operating data

Typical applications

These bushings are used on kiln trunnion bearings, riding ring supports and drive-end bearing positions in cement, lime and metallurgical kilns, as well as in dryers and similar slow-rotating drums. Related parts include bronze bushings and crusher bronze components for the same plant.

Manufacturing & inspection

We combine sand casting, centrifugal casting and metal mold casting with in-house CNC machining, so the bore, oil ways and fit are finished to your drawing. Each batch is checked by spectrometer composition analysis and hardness testing before shipment. More detail is available on our quality control page.

Send your drawing or a worn sample for a free evaluation.