Common fault causes and troubleshooting methods of skeleton oil seals
The skeleton oil seal is a dynamic sealing element, and the existence of "critical oil film" is a necessary and sufficient condition for oil seal sealing. A leak-free seal is not allowed or impossible. Because the existence of lubricating oil film is indispensable to ensure the oil seal edge to achieve lubricating friction lock, and the existence of lubricating oil film makes a certain amount of leakage inevitable. For rotary oil seals, it is permissible if a small amount of leakage occurs within 50 to 100 hours in the initial period of operation. As the operating time increases, the leakage will gradually stop, and the life of such oil seals is often relatively long. Within the effective period of use, a small amount of leakage is allowed, otherwise, it must be dealt with in accordance with the following common failure causes and troubleshooting methods of oil seals.
The skeleton oil seal is not good, causing early leakage
|Poor lip of the skeleton oil seals
|The seal Poor manufacturing quality, burr or defect on the edge of the skeleton oil seals
|Remove the burr or replace the skeleton oil seals
|The quality or failure of the spring of the skeleton oil seal
|The seal is poor ,The quality of the spring of the skeleton oil seal,The seal is not good.
|Replace the spring of the skeleton oil seals.
|The radial pressure is too small
|The spring is too loose and the holding force is too small
|Adjust the spring of the skeleton oil seals.
The skeleton oil seal is poorly assembled and leaks occur
|The lip of the skeleton oil seal seal has obvious scars
|During assembly, the skeleton oil seal seals through the keyway or thread, scratching the lip
|Replace the skeleton oil seal; when reinstalling, use a sheath to protect the lip of the skeleton oil seal
|The skeleton oil seal is deformed in a butterfly shape
|Improper installation tool for skeleton oil seal
|Redesign and manufacture of skeleton oil seal installation tool
|The lip assembly direction of the skeleton oil seal seal is reversed or the spring is loose
|Improper chamfering of the shaft end, excessive roughness, or excessive assembly force, causing the lip of the skeleton oil seal to turn over or the spring to fall off
|Grind the shaft end chamfer with fine sandpaper, apply grease, and install the skeleton oil seal carefully
|Excessive application of grease on the lip of the skeleton oil seal and the surface of the shaft
|During assembly, too much grease is applied to the lip of the skeleton oil seal and the surface of the shaft
|After the shaft runs for a period of time, the grease can be reduced and returned to normal
The skeleton oil seal lip wear
|Poor lubrication, the working surface of the lip seal of the skeleton oil seal is seriously worn, the width exceeds 1/3 or more, and it is dull
|Poor lubrication, dry friction on the lip of the skeleton oil seal
|Ensure lubrication of skeleton oil seals
|Shaft surface roughness higher than 0.8
|The shaft surface roughness is low, and the lip of the skeleton oil seal seal is seriously worn
|Shaft surface roughness drops below 0.8
|The lubricating oil contains dust, impurities, or there is no dust cover to cause the intrusion of dust and foreign objects.
|The oil is not clean, the hydraulic piping system is too dirty; the lip is invaded by dust, etc., causing abnormal wear; the shaft is adhered with powder and hard particles; during assembly, iron filings penetrate into the lip; casting sand penetrates into the lip; on the shaft Or the lip of the skeleton oil seal seal is misapplied with paint
|Ensure lubrication and cleanliness, and strengthen the cleaning of the piping system; in order to prevent dust from invading the lip, a dust-proof device is added; when assembling, pay attention to cleaning and remove misapplied paint
|The radial pressure of the lip of the skeleton oil seal seal is too large, the oil film is interrupted, and dry friction occurs
|The spring of the skeleton oil seal seal is too tight
|Adjusting the skeleton oil seal seal spring
|When the installation is eccentric, abnormal wear occurs on the lip sliding of the skeleton oil seal seal, and the maximum and minimum wear widths are symmetrically distributed; the size of the wear marks on the sliding surfaces of the main lip and the auxiliary lip of the skeleton oil seal seal is symmetrical with each other, but the size and position on the contrary
|The box , end cover and shaft are not concentric, causing the skeleton oil seal to run eccentrically; the seat hole of the skeleton oil seal is too small, and the skeleton oil seal is improperly pressed into the skeleton oil seal, resulting in tilting
|Guarantee the concentricity requirements of the box body, end cover and shaft; guarantee the skeleton oil seal seat hole size requirements
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the second part is Common fault causes and troubleshooting methods of skeleton oil seals.