Problems with the spring coils of the skeleton oil seal
Thread Content
The spring coil of the skeleton oil seal is placed in the annular groove of the oil seal. Is its size the same as that of the annular groove, or is it a bit smaller? Because what we do here is make them of the same size. Can it also serve to hold things tightly? I think the sealing layer is more than ten sizes smaller than the shaft. It acts at the starting point of the spring. The oil seals we use here, if used in over 10 stages, will leak within a year. Adding too many shafts caused more wear. Could it be a problem with the spring?
Are you an oil seal manufacturer or a user? Now I first try it by fitting it on the shaft; if it’s not tight, I cut off a part of the spring. If it’s too tight, stretch the spring a few times. Measurement with calipers is not very accurate; the lip of the oil seal is soft, making it difficult to measure. Rely on experience to make a living
Skeleton oil seals are usually lip-shaped, right? The operating pressure is not higher than 0.5, right? They are used for sealing oil, right? They are applied in situations where the operating conditions are not severe, right?
The outer cylindrical surface of the shaft should have a certain level of smoothness and hardness; the cutting edge of the skeleton oil seal must be smooth and regular, and it should be continuously lubricated with oil – otherwise leakage will occur in a short time
Such machine seals can be used as is; the key issues lie in the smoothness of the relevant static sealing surfaces and the sealing performance of the rubber. For reference.
The function of the spring is to continue providing sufficient clamping force after the oil seal has been in use for some time. For a new oil seal, there will be no leakage in the initial stages even if the spring is not used. Most oil seal manufacturers have equipment for measuring the clamping force; typically a shaft sleeve is used, and steel with a quenched hardness of HRC 50 or higher can be employed
Harden the outside of the shaft and then grind it out
I might not have described it clearly. What I mainly asked about was the size of the spring. Its relationship to the size of the annular groove it is set in
The spring serves a compensatory function; it is usually of a relatively small size. Do you need to add a spring by yourselves for the new oil seals?