Dynamic O-ring seal, rotary axial face seal

[bdeuell]

I am attempting to seal a an output of a gearbox against water and dust. This seal is intended to make the joint weather resistant and the pressure differential will be minimal. It needs to be cheap so I was hoping to use an O-ring. The O-ring would need to seal in the axial direction between two rotating faces with an ID of .375". I referenced the Parker O-ring handbook but they only described radial seals for rotating shafts. Is it possible to create an axial rotary shaft seal with an O-ring? Is there any reference material that would provide grove dimensions for this configuration?

 

[SnTMan]

Why not ask them?

Regards,

Mike

 

[Cockroach]

PolyPak. Much more robust for your application.

Regards,
Cockroach

 

[hydtools]

I've had good luck with the Forsheda v-ring. Grips the shaft and runs as a face seal against the housing to keep dirt and water out.

http://www.allsealsinc.com/forsheda_oil_seals.html

Ted

 

[btrueblood]

You want the seal surface to be in the axial, as opposed to radial direction, if I read the OP correctly. I see no reason it couldn't work, but it's not a common application; it's easier to control the runout/wobble of a shaft than an endplate/cap, and the endplate needs some way to hold the gap "closed" (i.e. spring loading?). In general, the dynamic O-ring seal requires higher tolerance controls to reduce the effect of shaft runout on e-gap, and to hold a smaller range of useful seal compression (smaller is better because it reduces O-ring friction and wear). Take a look at the amount of ring compression generated by the groove dimensions in the Parker handbook, comparing radial seal geometries between the static and dynamic cases. Then take a stab at using the same compression range for the face seal geometry (i.e. slightly deeper, but more tightly toleranced, groove depth).

 

[bdeuell]

Thanks for your responses. I think I'm going to take a stab at using an o-ring and creating my own groove dimensions based off the compression in the radial seal. I liked the Forsheda v-ring but would prefer to use a cheaper seal if possible, I will keep it in mind if I fail with the o-rings.

 

[monkeydog]

When I web search "axial face seal" there are a number of companys with "off the shelf" products.

Wouldn't one of those work?

 

[Tmoose]

A forsheda type seal does not require much extra machining, and possibly can approach IP 54 sealing rating.

 

[hydtools]

For the v-ring, just machine the correct housing face and the correct shaft diameter and not screw around with developing a groove($) and clearance($) for a 'cheap' o-ring.

Ted

 

[Hidromar]

Hi!

O-ring can be a good seal for rotating app both radial and axial, alwayss having a good hardware design, and working conditions

Grove design will be the same(just interpole sizes) on the ones from your preferred catalogue

http://www.hidromar.es