What is the features of seal RS RZ RSW RSH ZZ series bearing?

The purpose of the bearing seal is to prevent the leakage of lubricant in the bearing part, and to prevent harmful objects such as external dust, moisture, foreign matter and so on from entering the inside of the bearing, so that the bearing can operate safely and lasting under the required conditions. The general name of the device made for this purpose is the bearing sealing device. The sealing device is responsible for maintaining the running performance and durability of the bearing. Grease-lubricated seals are easier to come by, while oil-lubricated seals are more difficult. The sealing device can also be used in the form of a sealed bearing. The most direct explanation is that when we inquire about the bearing model, we often see the letters after the bearing model: ZZ series bearing, 2RZ, 2RS, 2RSW, 2RSH. These letters represent different types of bearing seals, and another sealing method is bearing composite seals. Based on the knowledge of bearing seals, share where these sealed bearings are used and the advantages and disadvantages of related seals.

1. ZZ-dust cover seal
Use environment: motor, etc. Advantages of ZZ series bearing: low cost, low starting torque, and can be used in high temperature and low temperature conditions. Disadvantages: large sealing gap (generally above 0.4mm) and low dust resistance.

2. RZ-non-contact rubber cover seal
Use environment: motor, etc.
Advantage:
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 precision requirements for the sealing ring and the sealing labyrinth groove are low, and the cost is relatively low;
3. Due to the labyrinth sealing structure, it has a good dust-proof effect.
Disadvantages: sealing gap MAX0.2mm, no resistance to dust, muddy water and water vapor occasions

3. RS-light contact rubber cover seal
Use environment: motor, water pump, automobile tensioner, etc.
Advantage:
1. The main lip is in axial contact with the labyrinth seal groove, and the starting torque and heat generation increase slightly;
2. Since the main lip is axially contacted and sealed, and the two secondary lips are sealed with radial gaps, it has a better dust-proof effect.
Shortcoming:
1. Higher requirements on the shape of the sealing groove and sealing ring;
2. It does not have the waterproof effect.

4. RSW-heavy contact rubber cover seal
Use environment: car tensioner, car condensing fan, etc.
Advantage:
1. Three-lip seal, optimized design of the main lip angle, axial interference to prevent excessive starting torque;
2. The extended first lip to form a small gap seal to prevent lubrication leakage and water vapor entry;
3. The joint cooperation of the second auxiliary lip realizes the combined effect of radial seal and axial seal, and at the same time extends the seal ring's ability to resist mud water and wear resistance.
Shortcoming:
1. Higher requirements on the shape of the sealing groove and sealing ring;
2. Powerless for long-term immersion operation;
3. Large starting torque affects motor power.

5. RSH- high contact rubber cover seal-(power supply hub structure)
Use environment: automobile water pump, industrial water pump, electric motorcycle, agricultural machinery, etc.
Advantage:
1. Used for special water vapor erosion needs;
2. The inner sealing lip improves grease retention;
3. Imported reinforced rubber material can better prevent water vapor from entering the bearing;
4. In order to reduce the torque and improve the sealing performance, the optimal structure of the sealing lip is adopted;
5. Since the sealing contact surface adopts high-precision processing, the friction loss of the sealing material is reduced and the sealing life is prolonged;
6. The special sealing lip design can automatically compensate for the wear of the seal.
Disadvantages: The friction torque is very large.​​​​

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