Brickley engine
Brickley engine
(OP)
Those of you with engine friction experience have any thoughts on the Brickley engine?
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
|
RE: Brickley engine
RE: Brickley engine
I'm guessing they'd be in greatest need of hydrodynamic lubrication right where it's least likely available, near zero velocity.
Mike Halloran
Pembroke Pines, FL, USA
RE: Brickley engine
RE: Brickley engine
RE: Brickley engine
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
http://eng-tips.com/market.cfm
for site rules
RE: Brickley engine
Just my opinion, but I fail to see how a larger number of sliding joints combined with a significantly greater amount of dynamic mass and reciprocating inertias, for a given displaced engine volume, will result in lower mechanical losses and/or improved brake thermal efficiency.
It's interesting that you inquired about "engine friction". The largest friction loss fraction in a piston engine is due to pumping losses. And this design does not seem to address those losses.
To paraphrase the old joke, it's just a "complex solution to a non-existent problem".
Hopefully, Mr. Brickley hasn't spent the family nest egg on this boondoggle.
Regards,
T
RE: Brickley engine
RE: Brickley engine
RE: Brickley engine
Not all of the links have the same friction load while others have a disproportionately high load. I can see packaging such a beast as a real problem, something a modern 4 or V-6 does reasonably well.
Wait a moment! He lives in my town! Why havent I heard of such a marvel?
Franz
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: Brickley engine
- Steve
RE: Brickley engine
RE: Brickley engine
Ah, yes. Because the nodding motion of the end of the H-shaped links (visible in the animation on the home page) forces the piston to move not in a straight line, but in a rotating or wobbling motion thru the cylinder. So, you can't have a skirt. Nor piston rings, or at least not conventional ones. And the piston will then need to be a section of a sphere. How does the piston seal?
Eliminating piston rings will certainly help reduce friction. But it will play heck with efficiency due to blow-by, at least until the pistons seize...
RE: Brickley engine
RE: Brickley engine
A Scotch Yolk has fully harmonic and zero side force on pistons and very few more parts but still was not used to any significant extent.
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
http://eng-tips.com/market.cfm
for site rules
RE: Brickley engine
Still, I don't see this living up to the hype. I see nothing about the energy required to continually reverse the direction of all those pieces, just claims about removing some of the rotating bearing losses in the crank.
RE: Brickley engine
RE: Brickley engine
... if they are perfectly proportioned, and if the reaction hinges are stiff enough.
Given all that, the piston can use ordinary rings, doesn't need a huge skirt, and could probably have a round skirt, not an oval skirt.
Mike Halloran
Pembroke Pines, FL, USA
RE: Brickley engine
RE: Brickley engine
This is another one of those internet designs that will go nowhere. Too much monkey motion. For simple recip you can't improve on whats already there.
RE: Brickley engine
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Brickley engine
Until the crankshaft is eliminated the actual thermal efficiency over a drive cycle will only improve a small amount.
Ed Danzer
www.danzcoinc.com
www.dehyds.com
RE: Brickley engine
RE: Brickley engine
RE: Brickley engine
RE: Brickley engine
Uh, maybe at wide open throttle, but the example he uses is for a part throttle condition (1/6th throttle) - meaning losses at the throttle plate.
Extrapolating a Willans line as a linear fit...doesn't sound right to me.
There are better sources out there for estimating the mechanical friction losses of reciprocating engines. The author should find these and cite them. And not buried in a blog somewhere.
RE: Brickley engine
RE: Brickley engine
If you want to convince this crowd that your engine has low friction losses, then you need to build one, and race it and make it survive in a motorcycle or a boat, with a vestigial or absent oil cooler.
Mike Halloran
Pembroke Pines, FL, USA
RE: Brickley engine
I agree that there is a far better way to convert a fuel into performed work, but the IC reciprocating engine probably ain't it. At the end of the day, you can't cheat physics.
RE: Brickley engine
RE: Brickley engine
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
http://eng-tips.com/market.cfm
for site rules
RE: Brickley engine
RE: Brickley engine
How much have you budgeted for formal analysis?
Mike Halloran
Pembroke Pines, FL, USA
RE: Brickley engine
RE: Brickley engine
The proof is in peer review and replicating test results. You have had your peer review from some of the industry top engineers.
Dont get me wrong, but we tend to be doubters until we see a working model. Today's Solidworks and CAD works FEA development is VERY accurate and far less expensive than building a nuts and bolts model.
Franz
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: Brickley engine
RE: Brickley engine
Even if it could do it, I wouldn't trust the results without a physical correlation model, running and instrumented.
Mike Halloran
Pembroke Pines, FL, USA
RE: Brickley engine
It's hard to see the watts link. Is the floating link the piece tying the large pieces to the H pieces? There just is no pivot shown in the middle of it making it very obscure to tell.
RE: Brickley engine
RE: Brickley engine
Of primary importance here is the reduction of the distances that the areas of oil being sheared have to travel.
RE: Brickley engine
just by putting one big piston with a crosshead,all the metal used for the pivotting levers could be used to build the rest of the vehicle.