BMG’s range of Tsubaki high performance chains comprises engineering-class SJ3 sealed joint chains fitted with improved sealing technology, increasing the reliability of mechanical components exposed to harsh environments.
“An important feature of the Tsubaki SJ3 series, is that extended bushing barrier seals prevent abrasive materials from entering and attacking chain joints, thus reducing wear and extending the service life of chains,” explains national product manager – Tsubaki, BMG, Marthinus Janse van Rensburg. “Tsubaki’s patented SJ3 labyrinth structure keeps each pin and bushing assembly, free and clear of contaminants. This multi-seal combination inhibits fine particulates from entering critical bearing areas. As a result, the risks of premature elongation, joint lockage and dry cavitation are reduced, allowing for more effective chain performance and longer life.
“The Tsubaki SJ3 design comprises three distinct seals. Although independent of one another, the seals complement each other to provide secure bushing and pin protection. The first seal is an industry standard extended bushing, that limits the clearance between the ends of the bushings and the mating sidebars. This provides a highly effective first layer of protection.
“The second seal is a polymer face seal placed around the extended bushings. These polymer face seals are available in various performance materials and can withstand temperatures up to 204° C. The final seal is a patented labyrinth seal that inhibits any remaining fine particles from entering the critical bearing area. The labyrinth is formed by a Stainless Steel ring attached to the pin, which rotates freely in a finely crafted groove in the bushing,” says Janse van Rensburg.
BMG’s durable Tsubaki SJ3 series has been designed for dependable operation in harsh environments, including mining, cement, paper, sugar and grain, chemical and petrochemical, as well as asphalt applications.
