design of a lubrication/discussion system

[Giag]

hi, I'm trying to figure out how to estimate the viscous friction resistance of a biella's palette in a burst engine, in particular the friction force between the oil mirror and shovel compared to the center of the crank. where can I find valid information, even if this type of lubrication is no longer used much? Moreover, this type of lubrication guarantees the lubrication of each bearing/box, or should it be foreseen particular arrival ducts to the bearings, if the blades do not beat the oil laterally to some of them?
Good day

 

[meccanicamg]

Maybe at least a drawing should be posted to understand what you're talking about. we take care of many things but of different kind.
We're not motorists.
many things are secrets of experimental evidence of constructing companies.
so you can just think of doing a fluid dynamic simulation with a cfd or do calculations by assuming that oil on the blades weighs.... has a distance and therefore lose that pair.
I have no idea that the oil turns with palettes on a biella. What are you talking about?
sure to make holes and lubrication beams improve the attainment of oil to components.

 

[Giag]

in my projects, which simulate and design by dialect, a lubrication system of this type would greatly simplify the application. that, that I always try to do is to properly dimensional everything, acnhe if I have few possibilities to realize what I think.
a few months ago I read an article about this type of lubrication in blast engines, but I can't find it anymore. I was wondering if it was still used, maybe I took a big oversight and I remember badly. I was particularly interested, because the palettes on the crank or on the biella, at regime, and in contact with the oil mirror, should be able to beat the oil everywhere in the carter
If you didn't have specific data, who could I ask?

 

[paulpaul]

hi, I'm trying to figure out how to estimate the viscous friction resistance of a biella's palette in a burst engine, in particular the friction force between the oil mirror and shovel compared to the center of the crank. where can I find valid information, even if this type of lubrication is no longer used much? Moreover, this type of lubrication guarantees the lubrication of each bearing/box, or should it be foreseen particular arrival ducts to the bearings, if the blades do not beat the oil laterally to some of them?
Good day

I think you're talking about the biellas with "dipper", that is, an extension that enters the oil and projects it towards the cylinder.
in these cases the biella is perforated, both on the head and on the foot, to let in oil in the respective bearings. lubrication has a number of well-known limitations:

- does not allow an effective cooling of oil (there is only low on the natural convection in the base, missing an external circuit with exchanger) and therefore it is good for reduced powers;
- is not indicated for high speeds (typical of modern engines), because the dipper in the cup tends to make foam;
- presents fluid dynamic losses of a certain type, although they are hardly quantifiable by hand (I think it is your question);
- does not allow an effective lubrication of smooth bearings that are normally found in the above two positions.

Googlando a little something you find:

Kart Racing Engines - Briggs Racing Engines

View our seven different Briggs & Stratton engines and find out which best fits your racing needs!

www.briggsracing.com

 

[Giag]

Your emails You've got the whole point. Specifically:

- is not indicated for high speeds (typical of modern engines), because the dipper in the cup tends to make foam;

I didn't know.

- presents fluid dynamic losses of a certain type, although they are hardly quantifiable by hand (I think it is your question);

This was my exact request! Plus...

- does not allow an effective lubrication of smooth bearings that are normally found in the above two positions.

...to develop a project with engines around 5kw (cyclomotors), I needed to understand if this is an effective lubrication to cover all moving organs (as well as efficent, i.e. it does not affect too negatively on the engine couple). Your emails kart engines (arrival up to 20kw) adopt this system?

 

[paulpaul]

I have no direct experience of this type of lubrication, but there are engines that use it about the power band you say: in the link I turned you there are explosions, even if not very detailed. If you're looking around, I'm sure you'll find others (see rotax engines for example).
personally I would feel safer using on the biella ball bearings, which are less sensitive to temporary ammancs of oil than smooth bearings, for which even few seconds of interruption of lubrication can lead to catastrophic consequences (of course also depends on working conditions): This, however, obliges us to adopt certain constructive limitations on manpower, and still there are engines with both solutions.
However, at the biella foot of the two times, the desired bearings are however necessary regardless of the method of lubrication (precisely for other reasons).