transmission motorcycle

[namu1769]

Good morning to all, I am an engineering student and I was assigned an elaborate to perform, but I planted and I don't know how to move on.
I have to design a classic transmission system for a motorcycle 800 cc. I chose chain pinion and crown but I stuck on the sizing of the slotted shaft of the pinion (forgive if I am a little ignorant in the matter but the motorcycles are not my strong).
Thank you in advance!

 

[MassiVonWeizen]

attach your calculations, schematics and what else you have processed so as to verify, comment, discuss

 

[Stan9411]

mhhh this will be interesting. I leave a comment to have notifications. :

However it's a vehicle, I'm interested in knowing what input data they gave you.. also because I think it should be identified a clear and realistic operational condition ... in acceleration and braking the whole transmission group undergoes tears that are to be quantified, because surely more stressful of the operation to regime

 

[namu1769]

I chose a chain 525 step 15.875 road, from catalogs of suppliers I assumed and verified pinion 16 teeth dp 81.37 and crown 42 teeth dp 212.43, I hypothesized an interasse of 650 mm for ua length of the tot chain of 1768.11.
I thought of using a c45 rm 780 for the tree; the engine gives a max torque of 83nm to 5750 rpm, the calculations for the tree I have not yet made them because on the manule that I have not mentioned the millerighe grooved trees. If you had any table or even a reference would be very helpful, thank you.

 

[namu1769]

mhhh this will be interesting. I leave a comment to have notifications. :

However it's a vehicle, I'm interested in knowing what input data they gave you.. also because I think it should be identified a clear and realistic operational condition ... in acceleration and braking the whole transmission group undergoes tears that are to be quantified, because surely more stressful of the operation to regime

I have no starting data, I only know that the engine is a 800cc, looking a little I decided to take the engine data of a bmw 800 gs, regarding the choices I made from a look at the comment above.
regarding tears I have no idea sincerely, it is the first time I dimension a chain, from the catalogs I have the maximum load than 22 thousand n, and I have verified that my chain resists that, I get a maximum force of just over 2000 n and knowing that these chains usually have a degree of security between 10 and 12 should be verified; correct me if I have reasoned wrong.
Thank you very much

 

[Stan9411]

no no, what I say take it with the pliers .. I deal with anything else. I was in the field of opinions.

actually if one refers to the maximum torque dispensed from the engine, it doesn't matter when and in what situation it is using it... at most always that will be. .

I'd say. I'm fried tonight.

 

[meccanicamg]

I lost something.
cinematism is formed, in fact by:
- combustion engine (copy and turn)
- multi-speed mechanical change
- chain transmission between pinion and crown
- all you download on the wheel

say ...63kw to 7500rpm and 83nm to 5750rm reported to the propeller....that is to that thing that doing up and down transforms the rotation motion said motor.then bmw says on his document that chain reports are 17/41 or 17/42 second of the version.

the exchange reports are below:I don't know if I get the idea.

It is not a matter of motorcycle or bike...it is necessary to understand how cinematism of anything that turns.
Try to put it in the first and the gases... all handled....get on the ground for the exchange report.

 

[Stan9411]

and no one had questioned him ....
if it is addressed to me.

as I am at this hour I shot it there that the load conditions to be used for the sizing came from the critical condition of operation side contact with the asphalt ... but, rethinking, one counts with the maximum that can deliver the engine and you are in place with those numbers in input.

I don't think we've said anything to lose.

 

[namu1769]

I lost something.
cinematism is formed, in fact by:
- combustion engine (copy and turn)
- multi-speed mechanical change
- chain transmission between pinion and crown
- all you download on the wheel

say ...63kw to 7500rpm and 83nm to 5750rm reported to the propeller....that is to that thing that doing up and down transforms the rotation motion said motor.View attachment 62197then bmw says on his document that chain reports are 17/41 or 17/42 second of the version.

the exchange reports are below:View attachment 62196I don't know if I get the idea.

It is not a matter of motorcycle or bike...it is necessary to understand how cinematism of anything that turns.
Try to put it in the first and the gases... all handled....get on the ground for the exchange report.

where did you find these bmw cards that I tried to find them myself but without results?
However, I repeat on these things I am a landslide and I am studying them. If available to help me out, I'd be very grateful.

 

[meccanicamg]

and no one had questioned him ....
if it is addressed to me.

as I am at this hour I shot it there that the load conditions to be used for the sizing came from the critical condition of operation side contact with the asphalt ... but, rethinking, one counts with the maximum that can deliver the engine and you are in place with those numbers in input.

I don't think we've said anything to lose.

It wasn't for you. as we write and reiterate of the 80 and broken nm in the first post and then we talk about chain I would say that our student has forgotten of the mechanical change.

 

[meccanicamg]

where did you find these bmw cards that I tried to find them myself but without results?
However, I repeat on these things I am a landslide and I am studying them. If available to help me out, I'd be very grateful.

learning to be is fundamental....I put in google "800 gs power relationships" and is the first link.I'll train you so you don't go crazy looking for him.

 

[namu1769]

However 16 and 42 do 2,625 as stated by bmw, and everything is sized with the highest report so the steps I have done so far should be right I think

 

[meccanicamg]

However 16 and 42 do 2,625 as stated by bmw, and everything is sized with the highest report so the steps I have done so far should be right I think

It says:

primary transmission: first fixed-report gear stage i=1,943

primary transmission variable part: gear speed change with front mount where you have different i=2,462 ratios in front gear

secondary transmission: pinion and crown with chain i=2,625

then if you put the first gear and open the gas to 5759rpm and soft the clutch you downloaded on the wheel shaft 83nm•1,943•2,462•2,625=1042nm ....104 kg on the lever by one meter....this is couple!

 

[Stefano_GS]

would you be so kind to share with us?
I mean: explicit the input data you have considered and the various steps, whether you have made them on a sheet of paper or you have prepared an electronic spreadsheet.
it would be easier for those who read if you even give the references of the components that you go to size/check with the attachments from which you drew the values.
otherwise we do not understand anything and we reason on assumptions built according to our interpretations

 

[meccanicamg]

there are several sites that offer spare parts and various explosions however it takes time to look good.

here an image of a motor of competition.as you see the pistons are connected to the elbow shaft with biella and crank. then you have two gears that make the first fixed stage that I told you to get away from the main axis.
then there are either two axes of the speed change and then the output on the belt or chain transmission system.... going to the wheel.

 

[meccanicamg]

would you be so kind to share with us?
I mean: explicit the input data you have considered and the various steps, whether you have made them on a sheet of paper or you have prepared an electronic spreadsheet.
it would be easier for those who read if you even give the references of the components that you go to size/check with the attachments from which you drew the values.
otherwise we do not understand anything and we reason on assumptions built according to our interpretations

I have recovered all the material otherwise I would not have been able to understand that a piece was missing even if I perceive to nose that 83nm cannot be on the wheel.
certainly that our student if he does not want to kill us must put data, hypotheses and explanations.

 

[namu1769]

would you be so kind to share with us?
I mean: explicit the input data you have considered and the various steps, whether you have made them on a sheet of paper or you have prepared an electronic spreadsheet.
it would be easier for those who read if you even give the references of the components that you go to size/check with the attachments from which you drew the values.
otherwise we do not understand anything and we reason on assumptions built according to our interpretations

Okay, as I didn't say, you opened me a world sincerely, I throw away everything and start over.

 

[namu1769]

I have recovered all the material otherwise I would not have been able to understand that a piece was missing even if I perceive to nose that 83nm cannot be on the wheel.
certainly that our student if he does not want to kill us must put data, hypotheses and explanations.

then returning to the main point, knowing that 390 nm and broken, (83 * 1.943 * 2.462, neglecting for now the relationship chain pinion and crown) as dimension the millerighe grooved shaft that comes out? because as I said in my manual they don't talk about it and I have no idea how this type of tree fits.

 

[meccanicamg]

regarding the transmission chain is a special built by queen chains, with step 525, 116 jerseys and model 137zrd. you can find its construction features here.

if you try to check the chain with a normal 10b-1 you will see that the couple you have to endure is much higher than possible and especially the pressure on the pins and on the compasses is 10 times as much.

then you have to find all the data of the chain, geometrically to be able to approach the real calculation.

 

[wert]

then returning to the main point, knowing that 390 nm and broken, (83 * 1.943 * 2.462, neglecting for now the relationship chain pinion and crown) as dimension the millerighe grooved shaft that comes out? because as I said in my manual they don't talk about it and I have no idea how this type of tree fits.

Come on, I don't believe you don't have a book where you're talking about sizing trees solicited torsion. . .