This video makes me understand more what a oil seal is. (An automotive student who needs to be tested this topic 2 days later. Alex in Canada from Hong Kong.)
Oil seals are the "unsung heroes" of all cars, machines, anything rotating. If they break, the replacement labour charges are 10 times higher than the cost of the seal.
Seal position normally at the outer part of shaft. To replace a seal, we must disassembly components after the shaft to insert the seal and assembly again and this work consume much time than replace the seal part.
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If the original is using single seal then using double seal will add friction to the shaft. Using thicker seal as long as the housing can accomodate is not a problem.
5:51 I have a project where I have to seal a vertically positioned shaft from water running down all around it. The shaft will rotate and also move up and down. Is this type of seal good enough for axial movement of the shaft too? If yes, which variation do you recommend? If not, what type of seal do you think is suitable for my case?
Seal commonly used for rotating shaft only ( example: engine shaft ) or in and out shaft only ( example: hydraulic jack ). I believe that there is a seal to fit your requirement but maybe it's special product for special application. the parameters like rotating speed, shaft diameter, shaft span in and out, shaft speed in and out, shaft roughness, fluids properties etc. These will be acccounted for the seal specification. I suggest you to contact seal manufacturer to get more comprehensive solutions.
