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Rotary piston seal lubrication.

 
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Graviman



Joined: 24 Feb 2006
Posts: 6

PostPosted: Sat Feb 25, 2006 8:36 am    Post subject: Rotary piston seal lubrication. Reply with quote

I've just had a look at this most excellent site. Am i right in saying that the Mazda Renesis has absolutely no oil lubrication to it's outer most rotary piston seals? I'm amazed since piston engines have at least have a trace of oil getting to the seals, and burning off in combustion. I gather these are cast iron seals, so there will be some carbon content.

How on earth is the wear kept to acceptable rates? The springs provide seal pressure, but is this just to help bed in the seals? What sort of pressures would be expected on the seals in service? How long would the seals be expected to last for road use? Is scuffing ever a problem?

I realise much work has been done perfecting rotary engine seals. I'm just trying to tap into what this was...

Mart Very Happy
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Blake
Been there, done that


Joined: 12 Jul 2005
Posts: 135
Location: Portland, OR

PostPosted: Sat Feb 25, 2006 9:31 pm    Post subject: Re: Rotary piston seal lubrication. Reply with quote

Graviman wrote:
I've just had a look at this most excellent site. Am i right in saying that the Mazda Renesis has absolutely no oil lubrication to it's outer most rotary piston seals? I'm amazed since piston engines have at least have a trace of oil getting to the seals, and burning off in combustion. I gather these are cast iron seals, so there will be some carbon content.

How on earth is the wear kept to acceptable rates? The springs provide seal pressure, but is this just to help bed in the seals? What sort of pressures would be expected on the seals in service? How long would the seals be expected to last for road use? Is scuffing ever a problem?

I realise much work has been done perfecting rotary engine seals. I'm just trying to tap into what this was...

Mart Very Happy


I'm guessing you mean apex seals when you say "rotary piston seals"...please clarify if I'm wrong. Anyway, there is lubrication from the oil injectors. The RENESIS has a pair of oil injectors in each rotor housing which lubricate the apex seals.
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Graviman



Joined: 24 Feb 2006
Posts: 6

PostPosted: Sun Feb 26, 2006 3:09 am    Post subject: Reply with quote

I mean the apex seals and side seals. I looked up the lubrication section on this site, but it is still under construction. I did wonder whether the seals might have oil feeds drilled into them, but the photos didn't show anything.

Where in the housing do the oil injectors sit? I'm curious since the seals are also used for port timing, so minimising oil loss would be a concern.

Don't worry i'm not EPA or anything - just another dumb engineer...

Mart
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