Dust cap seal:
The suffix is Z. ZZ or 2Z means that both sides are sealed with dust caps. Use environment: ordinary motor, dust-proof working environment. Advantages: low cost, low starting torque, and can be used in high temperature and low temperature conditions. Disadvantages: The sealing gap is large (generally above 0.4mm), and the dust resistance is low.
The suffix RZ-the bearing has a skeleton rubber cover seal on one side (non-contact type)/2RZ-the bearing has a skeleton rubber cover seal on both sides (non-contact type). Advantages: 1. The two sealing lips are not in contact with the bearing, the starting torque is low, and the heat generation is small; 2. The manufacturing accuracy of the sealing ring and the sealing labyrinth groove is low, and the cost is relatively low; 3. Due to the use of the labyrinth Sealed structure, with good dust-proof effect. Disadvantages: The sealing gap is Max 0.2mm, and it has no resistance to dust, muddy water and water vapor.
Low friction contact seal:
Indicated by the designation suffix RSL or RST, have a better sealing effect than non-contact seals, and are made of nitrile rubber (oil and abrasion resistant) reinforced with a steel backbone. It is mostly used for reducer bearings.
Denoted by the designation suffix RSH, RSH2, RS1 or RS2, made of steel frame reinforcement, typically nitrile but also Viton (designation suffix RS2 or RSH2 available on request)
RS-bearing with skeleton rubber cover seal on one side (contact type)/2RS-bearing with skeleton rubber cover seal on both sides (contact type). Use environment: motors, water pumps, automotive tensioners, etc. Advantages: 1. The main lip is in axial contact with the labyrinth seal groove, and the starting torque and calorific value are slightly increased; 2. Because the main lip is in axial contact and sealed, and the two auxiliary lips are sealed in the radial gap, it has a good dustproof effect . Disadvantages: 1. High requirements on the shape of sealing groove and sealing ring; 2. No waterproof effect.
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