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Offset Crank
Offset the crank to prevent side-loading during expansion | |
As the piston goes down during expansion, the angle of the
connecting rod creates a reaction force of the piston against
the cylinder wall. On older engines you can tell which way the
engine was spinning because the walls become more worn
from the expansion reaction than from the compression
reaction. Proposed is an crankshaft off center from the
center of piston travel. A compromise would be made to
balance the advantages of reducing this side-loading while
not interfering too much with TDC dwell characteristics and
with compression-stage side-loading.
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Annotation:
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I was pretty sure we'd already done this one at least twice,
because I remember being embroiled in an intense
discussion involving side-loading and unveven cylinder wall
wear. I'm also reasonably certain that real-world attempts
to bake this have been made. |
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I didn't say anything at first because, well, I was feeling too
lazy to go searching for links to back up my claims. Thanks
to mob rule, I now feel comfortable to make groundless
accusations. Thanks [WcW]. |
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Piston slap has been an issue since the first IC engines were designed. Take away the crosshead and slide (reducing mass, thus allowing higher revs) and the piston starts to oscillate round the gudgeon pin. |
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Sorry, you're about a century late with this one ... |
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//done this// most recently was yours truly's "Squiggle Cylinder" which totally eliminates downstroke sideloading, using a "Donut Piston" where the contact area is a circle instead of a cylinder. |
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But there are existing designs which offset the cylinder angle. |
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I thought this was just going to be me, standing a little to one side. |
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