US Patent 7678000 Tensioning arrangement for an endless linkage

A tensioning arrangement to an endless linkage of a drive train is provided. The tensioning arrangement includes a tension arm and a spool mounted at the tension arm. The spool includes a rib generally centrally located between opposing first and second endwalls of the spool. The rib includes a greater outer diameter relative to an outer diameter of adjacent cylindrical portions abutting the rib. Both opposing first and second endwalls of the spool are of greater outer diameter so as to steer the endless linkage therebetween in general alignment with the rib. A spring includes a hook free end engaged at the tension arm, and a linear shaped free end engaged at the frame so as to bias the spool against the endless linkage.