An issue I am encountering while tryng to work on my cardan gear design is that you need a minimum crank element diameter to transmit all the torque and horsepower without failing or distorting. However, since the ring gear is twice the diameter of the pinion gear, this forces a relatively long...
The extra connecting rods can be engineered from titanium and or take the form of thin wall tubes, adding little mass. If you change the crank to a cardan gear hypocycloidal system, the outer piston rockers, the inner piston rod connections, and the seperate crank journal pieces can all be...
I think that the main attraction of the OPOC design is that it offers the efficiency of a diesel in a small package with a lot of power. Ecomotors estimate over 300 hp for their 2 cylinder, 4 piston version for automotive use. Even if that is off by a lot, and maintains diesel liek efficiency...
Indeed, I have yet to find any evidence of any rollerized diesel engines at all. However, I have done quite a bit of research on silicon nitride bearings lately, and thought they might be able to make a rollerized diesel a possibility. The rolling elements are much harder and lighter, they run...
Most of the motors on the road today don't run in trucks for a million miles...
Look, I am just having fun with this and exploring some ideas. I'm not saying what I am doing will introduce anything new in the world of engines, and I am sceptical as anyone else. If shown my concept is fatally...
By the way, Timken has split shell bearings that they have used to rollerize crank slide motors with pretty good success.
http://engineeringtv.com/blogs/etv/archive/2007/05/31/episode-42-rollerized-engines.aspx
I don't even think the bearing elements are silicon nitride, as I would like to...
And thats what I was trying to determine - if a cardan gear "built up" crankshaft could handle the loads of diesel engine operation. I am trying to figure out if commercially available bearings can withstand the pulses and loads, and if the general design I am working on is robust enough as...
Thanks for the input on figuring out those forces. After doing the numbers using your inputs, I am getting approximately 49,000 psi. Does that sound like the upper limit of the forces that occur at the big end?
As far as the problem I am trying to solve, I want to combine the surface area and...
Well, you could use a boxer configuration, or an OPOC design, and there are a couple of designs at www.wiseman.com. The Wiseman site claims you can use counterweights to create hypocycloidal engines with as many cylinders as you like. I'm not saying they are the final word on the subject, far...
https://oa.doria.fi/bitstream/handle/10024/36120/isbn9789522145345.pdf
This paper compares the slider crank to the Cardan gear when used in internal combustion engines and was written just last year. The conclusion states that a cardan gear setup in IC engines would be superior to that of...
I think if you work out a couple of refinements that the OPOC engine DOES have a lot to offer in the way of increased efficiency. The desireable characteristics of the engine have been spelled out in detail. No valvetrain, increased power density, etc. I too would like to see independent testing...
I am curious, could the use of biodiesel in this kind of engine increase lubrication in the cylinder and perhaps help prevent piston ring scuffing? Though there seem to be some compatibility problems with some direct injection sytems, I have been reading that bidiesel has more lubrication...
Hi All, I am curious if anyone can share some info on how close of a tolerance you can achieve with full ceramic bearings (including ceramic races), preferably in silicon nitride. I am looking for both roller or ball configuration, and the ability to withstand heavy duty use. I am considering...
I have a design I have been working on for a few months that would give the OPOC engine a hypocycloidal "cardan gear" crank system. The more I develop it, the more reluctant I am to post it in public. You know how that is...
It uses silicon nitride bearings to save weight, to increase rpm and...
