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The oil seal to prevent leakage from the can in the dynamic and static conditions by controlling the amount of interference between the lip and the mating surface must meet the following conditions:
    1, according to the tolerance of the standard requirements of the manufacture of oil seals.
    
    2, The requirements of the shaft surface, such as the roundness of the shaft runout, shock load, deformation dynamic hold to be controlled within the limits of, in order to establish and maintain satisfactory oil film.
Surface roughness of

2.1 axis
Whether the role of the ring, the shaft surface roughness is a major factor (Ra = 0.2 to 0.8υm or Rz and = 1 ~ 4υm Rmax = 6.3υm) work in order to save the film Ra and Rz values ??are generally less than the above brackets given the minimum, in order to guarantee the life of Ra and Rz values ??should not be larger than the maximum roughness more than Rmax can lead to leakage.
Hardness of

2.2 axis
Minimum hardness of the shaft surface and the oil seal contact area for the RC30. Axis of occasions in the installation process is easy to scratch the shaft, it is recommended that the hardness increased to at least RC45, to prevent the shaft when installing permanent damage, affect the sealing ring sealing effect.
2.3 eccentricity
Eccentricity can cause irregular wear, and impact on seal life; proven practical experience, the eccentricity should be maintained at the following 0.25mmTIR.
2.4 axis of the bulge or not round
This situation is caused by the mechanical installation, such as the flywheel bolts to connect the shaft end this phenomenon occurs, it will cause the seals leak.
2.5-axis radial swing amount
Generally no more than 0.25mmTIR Otherwise, the shaft speed increases, the seal lip can not follow the axis of the high-frequency partial convex role, resulting in seal failure; at higher speeds, the rubber lip due to its inertia to leave the shaft the possibility of the surface, and also lead to seal failure; radial swing deviation between the main lip and the shaft is greater than the value necessary to keep the fluid dynamics lubrication, fluid in the sealed position will leak, having no seal effect, resulting in the leakage phenomenon.
    
3, the choice of rubber lip material conditions of use of the environment can play a role.
3.1 lubricating oil
Lubricant during use, not only the material will change, and which act as a lubricant additives will change after the change of decomposition will produce heat, oxides, these decomposition products may be the sealing material will have a huge impact , so they will be considered.
3.2 Temperature
The time and temperature enables the sealing materials and lubricants respective itself as well as between them the role of irreversible change. Temporarily harden at low temperatures, the rubber material, to temporarily increase the viscosity of the lubricating oil, the main lip may leak, seals the gap and abnormal wear, this hardening of the material will lead to a reduced ability of the main lip to follow the axis changes , which occurred in the low-temperature leakage. Continuous high temperature rubber main hardening phenomenon. Axis the amount of interference, the role of pressure on the seal also make rubber lip and the axis of the contact surface heating phenomenon, the higher rotation speed, pressure can also cause the temperature of the main lip and the lip contact surface and lubrication a larger temperature difference between the oil, so that the lip below the viscosity of the lubricant changes will also affect the sealing effect of the ring.
    4 correctly install the oil seal
4.1 tilt installation
The main oil seal lip whether it can effectively sealing the role of a factor is the verticality of the outer side face of the installation of the reference axis. Along the oil seal outside diameter measurement of the vertical take 0.25mmTIR is recognized to be effective.
4.2 The sealing lip protection
The oil seal lip over the surface should be smooth with no rough, the installation process do not flip lip painted with oil or grease films, before installation in the shaft or oil seal lip to prevent damage oil seal lip possibilities.
4.3 The bond strength
Sealing material and metal inserts combined with poor will also be a serious cause seal failure.

    5 is mistaken for oil seal leakage examples:
5.1 junction leakage from the machine. The permanent deformation of the gasket and tighten the screws to release the assembly of component defects.
5.2 by the cracking of the machine body, hood and other parts of pit (casting) at the leak.
5.3 assembly of the seal and chamber toward the atmospheric surface attached to the part of the grease.
    5.4 oil seal using the initial lubricant overflow.