Patent ID: 8235851

Claim:
A tensioning or deflector pulley for a belt drive of an internal combustion engine, comprising: a plastic or steel running roller, which is formed by an inner hub ring and an outer running ring and a wheel disk connecting the two rings to one another; a radial rolling bearing which is fixed position radially within the hub ring of the running roller, the radial rolling bearing having an inner bearing ring, with a first groove-shaped raceway, an outer bearing ring, with a second groove-shaped raceway and a multiplicity of rolling bodies rolling between the bearing rings in the groove-shaped raceways; a bearing cage holding the rolling bodies at uniform distances from one another; a seal axially spaced from the rolling bodies at both sides of the rolling bodies so as to seal an interspace, which is designed as a grease repository, between the bearing rings the seal includes a reinforced lip seal and a sealing disk axially spaced from the reinforced lip seal, the sealing disk has an elastic sealing lip at one end which contacts the outer bearing ring and only an axially outwardly extending rim at another end which contacts the inner ring, wherein the radial rolling bearing is a spherical roller bearing, and the rolling bodies are spherical rollers with two side faces flattened symmetrically from a basic spherical shape and arranged parallel to one another, the spherical roller bearing having, in relation to a comparable ball bearing, an increased load-bearing capacity due to a greater number of mountable rolling bodies and, simultaneously, an enlarged grease repository due to a reduced construction space of the rolling bodies.