Conjoined piston engine with Free valve system.
Vložit
- čas přidán 23. 04. 2021
- My Conjoined piston engine. A new type of internal combustion engine, composed partly of two crankshafts spinning opposite directions. They are kept in sync with a simple gear system. This is simply a different way of building the short block of an engine...with many advantages..such as reduced friction..smaller size..far less moving parts, higher revs, more power, and perfect primary and secondary balance.. Here are the technical specs....... There would be one or two ring gears (with teeth numbering 2x) attached to or part of the pistons surrounding the crankshafts with their diameter equal to the throw of both crankshafts combined or (2y). One or two gears (with teeth numbering x and diameter equal to y) attached to the primary crankshaft affixed to the rod journal so that they ride inside of the ring gear(s). The main crankshaft and secondary (or eccentric lobe) will have the same offset, therefor if each crankshaft has a throw of two inches the pistons would then travel a total of four inches. The engine would have a minimum of two pistons, each set of opposing pistons are bolted together, making one solid unit. This engine would have opposing pistons similar to a Boxer engine configuration, with the exception that the pistons are directly across from one another. The cylinders and heads will work the same as they do in a conventional engine.
The benefits of this design; There are no connecting rods. So the engine should be able to withstand much higher RPM than a conventional engine. This design also insures that the pistons will stay in-line with the cylinders, and therefor reducing friction. There are also less moving parts, a 4-cylinder engine built using this design would have only 5 moving parts in the short block, as opposed to the 9 moving parts found in conventional 4-cylinder engines.
Components;
A. The main crank, a standard looking engine crankshaft, with the exception of the gear(s) permanently affixed to the rod journal, with teeth numbering x. The diameter of the gear(s) is equal to the throw of the main crankshaft or y.
B. The secondary crankshaft, or eccentric lobe is round with an offset hole that the main crankshafts (A) rod journal rides in.
C. The pistons, which when bolted together form one solid unit from piston to piston. They have rings and oilers the same as most other pistons. They have a hole in the middle where the main (A) and secondary (B) crankshafts ride.
D. Ring gear(s), with teeth numbering 2x. The gear(s) that are affixed to the main crankshaft (A) ride inside this ring gear(s). The diameter or the ring gear(s) is equal to the throw of both cranks combined or (2y). Craig Laycock 423-307-4323 5/14/09 - Auta a dopravní prostředky
Crazy compact for 8 combustion chambers
This is very impressive!
This would be the most compact flat 8 ever
And preingnition chamber, velocity stack, CFFRP diagram joined with a variable turbo with a long shaft to separate hot and cold sides and we're good
How do you cool the pistons adequately for this design to compete with modern engines already in production?
But how many eccentric crank shafts fail on rotary, it's not a very common thing and if they make them from some forged high carbon steel then it's got very little chance of breaking a tooth or failing gears are cut so well these days they just don't wear like they used to
Just like most other engines. It’s just a water boxer.
you dont
And interesting, looks like if you wanted to increase throw on the crank, you'd also have to increase bore size. Too cool
I wonder how you would manage oiling and blow-by. Really cool design though.
can't wait to see one of those running on e100 and a big turbo
Do you have an animation with moving valves? Just out of curiosity, do you know how efficient this might be? What RPM would it idle/operate at?
Deceptively simple
Cool idea but the stroke is pretty short and it seems that the pistons change directions too quickly. I would love to see one running.
When is somebody gonna make this already??
This engine will reliable as hell
I think you would need to test the stroke to bore ratio to see which gets the best performance or economy
Looks like your stroke is limited to a max of about 70% of bore, is that correct? (high RPM ratio) The gear width and steel material will need to be hefty to take the shock loads and 1500 psi of combustion, greatly increasing reciprocating weight (limiting RPM back down again). Looks like assembly will be accomplished by slicing the block into 2 cylinders (4 pistons) at a time, making it somewhat modular, like the Wankel. Seems to have the advantages of a Wankel, but none of its drawbacks. Might be as lightweight as a Wankel in kg/hp. I see no problems in cooling; as all the same methods are available as in any conventional engine. Its an extremely compact design, going to fit a lot of places where a V8 can't. Instead of throwing a connecting rod, you're going to break a gear - sure to do lots of damage (but using the red component as a cover plate could contain it). You can clock 4 of the pistons to 90 degrees out from the first 4, for better balance and smoothness of power (or maybe you are swayed by the 'flat-plane' hype, but it only applies to V8s). Fascinating concept; great innovation. Good luck to you.
Thank you! In this iteration the stroke is 80% of the bore, I was able to get closer to 85% by moving the gearing to the center as shown in this video... czcams.com/video/1MS8bYxBZkA/video.html An engine with a shorter stroke has the advantage of reaching a higher rpm. As far as assemble I believe I can get away with a two piece block...although I will need to have some sort of jig to assemble the piston assemblies to the crankshaft and then install all of them into one half of the block at the same time.
As far as timing... combustion would have to take place in pairs in this animation.
Again thanks for the comment!
my same thoughts about the wankel but with
This is gonna work well with crossplane crankshaft
Why would anyone even think about making this crossplane? It's not a V engine, so it will just make vibrations worse with absolutely no benefit.
Very cool idea. Video could do with more insight. It seems very feasible though
Where is useing?
Fusion 360 Autodesk.
I love the idea, but do you need the teeth? Can it even work at all as a geared system?
czcams.com/video/RDssrAHVcFI/video.html Mostly needed when starting the engine.
@@Drcraigpl OK, have you actually got one of these engines built and running?
@@davidevans9992 not yet but I have built a proof of concept as far as the motion of it.
@@Drcraigpl Cool! I hope it works. Would be awesome if it does!
The only problem I can see, coming from a mechanics point of view is how the he'll would you take the eccentric gears or piston gears or whatever off without disassembling the crank,
I mean getting the valve assembly and and spliting the block would be easy then then crank shaft would come straight out and the pistons could side off the gears and off the crank but how would you get the gears of the crank?
If you look closely the piston dome has countersunk bolts, which evidently allow for the pistons to be parted in the middle..... pull the heads, hold bolts on the dome of one piston, loosen the other side.
Soon to come, 8 cylinder Subaru
How do you assemble this monster
You would want to have a special jig to hold the crankshaft, with ring gears hanging free, while you bolt on the red eccentric connecting lobes, then bolt on the upper and lower piston assembles, then bolt on the internal ring gears, then slide all of that into half of the block and then bolt on the other half of the block, next bolt in the 8 piston ends. and finally the heads.
Seems like with all that power you’d need to bulk up some components
There doesn't seem to be much room for coolant channels...
Not necessary you can use the oil as a coolant that's what they do with aircraft engines.
This appears to be a very early proof of concept... still a long way from thermal modeling and factoring in cooling.. Could wind up only needing oil cooling with the right selection of oil pathways, capacities, and flow rates.. partnered with modern materials selections to limit/direct spread of heat...
The only thing that annoys me about this design is that I thought about it 10 years ago.
I know, you're all thinking 'yeah, sure you did'.
Why would it annoy you then? You should be happy that you had an idea that some people believes in
This would NEED freevalve cuz otherwise it would get too thicc
You don't even need gears inside the connecting rods. You just need Scotch yokes.
this looks like a modernized Bourke engine
the difficult part is the electritronic valves, currently there is still no manufacturer which can provide a proven electronic valve system.
and mechanically, the possible weak point is the gear in the scotch mechanism, in conventional engines with connecting rods, the bearing structure plus oil film can be extremely reliable even under sudden load shocks.
however this can be an ideal option for power generation and phev extender (battery charger), these applications need a compact engine with minimum maintenance, and these application can avoid load shocks which could damage that gear.
I thought the Electronic Freevalve technology was already used by Koenigsegg for years now... It is an amazing technology
Next F1 engine
This would never work as it would destroy the cylinder walls from the the opposing combustion and the rattling would cause catastrophic failure. These may be a way to increase dampening through injection ports in bearings to assist and help lubricate. But by way of either burning like a wankle rotor or extremely high pressures and tiny tolerances to prevent "blow-by".
Still a great concept nonetheless.
I'm sorry I don't see/understand the need for the gears. I don't understand why that is necessary.
It's like you have and infinitely short connecting rod. Conventional con rod engines don't need gears there. Great concept. The ic recip engine is far from dead
This confuses me
This would be the most compact flat 8 ever