Waterproof shaft


Hi. Thinking about how to get the shaft completely waterproof. Have looked at common ball bearings from NTN and SKF with seals, but these are certainly no ip-class. Anybody have experience with this?


You mean something like 608 2RS bearings with double sided rubber seals and grease inside? I have those for testing with a direct drive outrunner setup. Do you have a rating considering differntial pressure for those? I did not find a pressure spec, I just use them to protect the bearings in water.


I mean to protect the bearing that is attached to the housing (have not found any waterproof bearings yet).I think I will make some tests with:

A rotary shaft seal (or maybe multiple) attached on top of the bearing that protects from water


I guess most people here have to deal with the danger of getting saltwater into the motor/bearingsā€¦


Two oil lip seals to seal the shaft and I am also using a ceramic bearing running wet outside of the seals to stabilize the prop. See: Pacificmeister Build Info and CAD Sources


Do you have a complete waterproof housing? Any problem with leaks with that solution ?


Another variant could be to use a rubber tube with the same inner diameter as the shaft and put fat on the inside. The advantage of this is that the contact surface between the shaft and the seal becomes considerably larger, however, one should look at heat generation.