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| Why Sectional Piston Rings? https://www.rypn.org/forums/viewtopic.php?f=1&t=42816 |
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| Author: | mldeets [ Wed Dec 12, 2018 12:58 am ] |
| Post subject: | Why Sectional Piston Rings? |
As a corollary to the Steam Piston Ring thread, I've been asked "Why were sectional rings developed?". I don't know the answer myself and with the good discussion going on I thought I'd pose it to all here..............MLD |
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| Author: | mldeets [ Sat Dec 15, 2018 2:32 pm ] |
| Post subject: | Re: Why Sectional Piston Rings? |
No ideas? ...Bump...mld |
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| Author: | SZuiderveen [ Sat Dec 15, 2018 2:36 pm ] |
| Post subject: | Re: Why Sectional Piston Rings? |
Single snap rings wear the bore oval, while sectional rings wear the bore round(er). Steve |
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| Author: | mjanssen [ Sun Dec 16, 2018 2:36 pm ] |
| Post subject: | Re: Why Sectional Piston Rings? |
American Hammered developed a peening machine to provide variable tension around the circumference of one-piece rings in the 1910's. This technique was done by hand considerably earlier than that. The result is that when you look at the unrestrained ring it is egg-shaped being a smaller radius at the splitline and larger opposite from it. It is possible to make a ring with these characteristics by laser cutting/ cnc milling which is what they do today for large ship engine rings. If you don't have a piston or valve that comes apart at the ring grooves, a sectional ring is the practical solution for a heavy cross-section gray iron ring or a bronze ring. |
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