Product details page content
The oil seal device under the Efficient china oil seal design prevents dust, moisture, metal powder and other harmful substances from invading from the outside. Prevent bearing chamber lubricating oil from leaking. Therefore, the oil seal must always remain airtight and dust-proof under any operating conditions. It is not allowed to cause abnormal friction and burns. At the same time, the disassembly and maintenance of the bearing can be carried out smoothly.
When using the oil seal device, you need to choose the appropriate oil seal device according to various purposes and combine lubrication methods.
1. Non -contact oil seal device
As an oil seal device that does not contact the axis, and there is no frictional part of the oil sealing device, there are structures such as oil grooves, oil -shaking rings and maze oil seals, and use the centrifugal force and small gap to seal.
(1) oil groove
The structure of the oil groove is a structure that uses the small gap between the shaft and the shell cover and the several grooves set on the small gap to play a sealing role. In addition to the low speed, it is not effective to prevent the leakage of the lubricant alone. Therefore, it is more used than the oil -shaking ring and the maze oil seal. In addition, it has a certain dustproof effect in the lubricant of about 200 in the oil tank.
The smaller the clearance of the shaft and the shell, the better the effect.
Axis diameter (MM) radial gap (MM)
Below 0.25 ~ 0.4
50 ~ 200 0.5 ~ 1.5
The width of the oil groove is about 3 ~ 5mm, and the depth is about 4 ~ 5mm.
(2) Follow the oil ring
Use the centrifugal force of the rotor installed on the axis to prevent the oil seal structure that prevent oil leakage and dustproof effect. Placing oil rods on the inside of the shell is the main purpose of preventing oil leakage and used for less dust. Placing the oil rod on the outside of the shell is to prevent the invasion of external dust and moisture by the centrifugal force of the oil rod.
(3) Maze oil seal
The maze oil seal is a bump combination with a small gap between the shaft and the shell, which is particularly suitable for preventing the leakage of oil from high -speed shafts.
When the maze oil seal is assembled, the labyrinth oil sealing gaps in the radial direction and axial direction are shown in the table below:
Axis diameter (mm) maze oil seal gap (MM)
Axis direction in the radial direction
Below 0.25 ~ 0.4 1 ~ 2
50 ~ 200 0.5 ~ 1.5 2 ~ 5
2. Contact oil seal device
The contact -type oil seal device is the contact with axis friction with the tip of the synthetic rubber, synthetic resin, and felt.
(1) Oil dense sealing circle
There are many oil sealing circles in places where foreign bodies such as dust and moisture are easily invaded from the outside, or to prevent leakage in the shell. Many structures and sizes in the oil sealing ring have been standardized (refer to JISB2402). In order to maintain proper pressure, multiple sets of springs are installed. Therefore, you can follow the eccentricity of the axis and scratching exercise to a certain extent. The material of the sealing lip uses the synthetic rubber, acryl, silicon, fluorine, etc., and tetrafluorosterolytic ethylene resin. The upper limit of the temperature is allowed to increase in order of the above materials.
If there is no oil film between the sealing lip and the axis, it is easy to cause fever and wear. Therefore, when installation, you must apply some oil on the sealing ring. In addition, during operation, the lubricant in the shell is slightly ideal. The permission of the oil -dense sealing circle is different from the seal structure, the degree of processing of the sliding surface, the sealing object, the temperature conditions, and the eccentricity of the axis. Applicable temperature range, which is limited by the material of the sealing lip. For good conditions, the permit speed and use temperature are allowed below:
Oil seal material allows the circular speed (m/s) to apply temperature range (℃)
Synthetic rubber NITRILE RUBBER 16 below -25 ~+100
Acrylic Rubber 25 ~+130
Silicon system below -70 ~+200
Fluoride 32 below -30 ~+200
Fluoride ethylene resin below 15 ~+220
Note: When running in a short time, you can take about 20 ° C by the upper limit of the use temperature.
The circular speed is large. In the case of high internal pressure, the sliding part of the shaft is required to be well processed, and the eccentricity of the shaft is also less than 0.2 ~ 0.5mm. In order to improve the abrasion resistance, the hardness of the shaft sliding area needs to use heat treatment or hard chrome plating to make the hardness reach HRC40, which is more ideal if it can reach HRC55 above.
The rough standard of the surface of the sliding area of the circular speed requirements of the shaft is as follows:
The maximum surface smoothness R
5 Below 3.2S
5 ~ 10 1.6s
10 or higher 0.8s
(2) Find sealing ring
The felt sealing ring has been used for the transmission shaft a long time ago, but it is difficult to avoid oil leakage and soaking. Therefore, it is only used for the purpose of lubricating dust, and it is not suitable for a large circular speed of the shaft.
