Non-cylindrical Dynamic Seal?
Non-cylindrical Dynamic Seal?
(OP)
I am designing a linear actuator. I would like a dynamic seal between the piston and the bore (IP66), but the piston will have some torque on it as it slides, so a cylindrical design won't necessarily stop it from rotating. Putting a flat on the piston would stop it from rotating, but I'm not sure how to design the seal groove then, or what seal to use. Does anyone have experience with non-cylindrical dynamic seals?
Thanks!
Thanks!





RE: Non-cylindrical Dynamic Seal?
RE: Non-cylindrical Dynamic Seal?
RE: Non-cylindrical Dynamic Seal?
RE: Non-cylindrical Dynamic Seal?
If not, put the d-flat on the shaft and guide it in the housing, and leave the piston round.
RE: Non-cylindrical Dynamic Seal?
I maybe able to use a keyway and a wear ring, because it probably only needs to be IP66. So I may not need to fully seal it.
RE: Non-cylindrical Dynamic Seal?
Making the cylinder and piston oval or trilobular adds various amounts of torque capacity and allows you to seal with conventional materials and geometries. The only penalty is a cost increase.
RE: Non-cylindrical Dynamic Seal?
If your dynamic seal follows your flat face, the seal controls your rotation, sort of. Is that acceptable to you?
Unless someone here actually has done this, you are going to have to build a prototype and test it, and then test it again. What are the consequences of your device not meeting IP66?
--
JHG
RE: Non-cylindrical Dynamic Seal?
Ted
RE: Non-cylindrical Dynamic Seal?
You beat me to it, have done this several times when space is limited.
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