Isolator belt pulley

The invention discloses an isolator belt pulley. The isolator belt pulley comprises a belt pulley main shaft, a sleeve, a belt pulley outer ring, a spring type seal ring and a profile roller one-way retainer, wherein two ends of the profile roller one-way retainer are respectively provided with a sealed carrying bearing and a carrying bearing. The belt pulley is characterized in that: a group of profile rollers are uniformly embedded in the profile roller one-way retainer through springs. According to the isolator belt pulley, hard friction of a traditional gear type thrust plate is canceled, the profile roller one-way retainer is adopted, and the profile rollers and the belt pulley main shaft form flexible friction to achieve the aim of one way by utilizing the change of contact angles between cambered surfaces of internal surfaces of the profile rollers and the belt pulley main shaft when relative rotating speed between the belt pulley outer ring and the belt pulley main shaft changes, so that the hard fric