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Analysis of sealing failure of Koyo bearing

2020-06-26 07:46:47

The hydraulic seal is very important for Koyo rolling bearing. If the sealing position of domestic shock absorber bearing supplier is difficult, it will cause great harm to Koyo rolling bearing. If the hydraulic seal with irregular appearance, lack of meat, tiny crack other defects is allowed.

The sealing test of Koyo rolling bearing is to evaluate the sealing position of hydraulic cylinder the reliability of assembly work. For example, the sealing connection of the cylinder port of the hydraulic cylinder, the upward movement of the piston rod of the hydraulic cylinder (between the rod cavity the non rod cavity), the hydrostatic seal the sealing condition, etc.

The working pressure of Koyo rolling bearing airtight test is very large, especially for the pressure test without rod cavity. If there is no work clothes to bear, it is definitely good for the hydraulic cylinder to bear the very large working pressure on the hydraulic cylinder according to the effect of the piston rod. Therefore, this kind of hydraulic test is usually carried out after carefully assembling the hydraulic cylinder, then it is carried out in the whole equipment adjustment link of welding.

A. Poor installation

The clearance between Koyo rolling bearing shaft diameter Koyo bearing hole with seat is relatively long. The installation of shock absorber bearing is mostly by pressing in method. A very simple way is to use copper rod hammer to strike the seat ring with transition fit of Koyo rolling bearing symmetrically in a certain order, so that the Koyo rolling bearing can be pressed in successfully. In addition, the waterproof sleeve made of soft metal can be driven in by hammer press. If the actual operation is good, the seat ring will be deformed cracked, the non transition fitting seat ring will be hammered by hand, which will cause the dovetail guide rail turnover body to be imprinted the Koyo rolling bearing will be indirectly damaged.

B. Poor temperature control during installation

When installing the Koyo rolling bearing, if the clearance between it the shaft diameter is very large, the hot installation method is generally adopted. Put the Koyo rolling bearing into the gasoline barrel filled with automobile oil. The outside of the oil barrel is heated with boiling water flame. The processing technology of automobile shock absorber bearing stipulates that the temperature of heating should be controlled at 80 ℃ ~ 90 ℃. Generally, it is easy to exceed 100 ℃ the maximum number is easy to exceed 120 ℃. After heating the Koyo bearing, quickly remove the sleeve put it on the motor shaft. If the heating temperature is too high due to poor temperature control, the Koyo rolling bearing will be quenched the strength will be reduced, the Koyo rolling bearing will be easy to damage, fall off even crack during operation.

C. Improper adjustment of time space for installation

Its axial run turn over clearance are all compensated by the rolling element's radial expansion clearance compensation.

For the Koyo rolling bearing with adjustable clearance, because there is a positive proportion between the radial clearance the axial clearance, the required axial clearance can be obtained if the radial clearance is properly adjusted. However, they are generally used in pairs (i.e. installed on both sides one end of the shaft). Therefore, only the radial clearance of one Koyo rolling bearing must be adjusted. Generally, the radial clearance can be adjusted by gasket, some can be adjusted by screw thrust ring.