Ls: bearing side has the contact seal, inner ring without sealing groove;
Rz: bearing side has a low friction lining plate synthetic rubber seal (non-contact);
Rs: bearing side with synthetic rubber or polyurethane contact seal (contact).
Here refers to the sealing and bearing contact and not contact is not in contact with the bearing inner ring, RS type of bearing seal and bearing inner ring close contact, good sealing effect, like oil seal structure, the RS model of bearing could save the mechanical structure of oil seal, imports of RS series bearing sealing effect is better. RZ type bearing ring does not contact with the bearing inner ring, have crack, only have the effect of dustproof, this kind of structure is not sealed, the bearing general refill oil seal device used in the mechanical structure. RS for sealing ring and the inner ring of contact friction, friction type is in fact not contact didn’t limit speed is lower. RZ model can achieve open bearing limit speed. At present, the basic rarely RZ series production, generally with ZZ stamping pure metal dust cover instead.