transmission

[bboyfab]

hello to all.I need your help.
for an examination I have to carry out such a transmission.
In practice what I have to do is put the madman.
I thought I would use a system similar to that of the change of
a car putting a creep bearing between the lower shaft
and the wheel conducted and then put a solid sleeve with the lower shaft controlled by a lever that allows me to transfer or not the bike.

What do you say?

 

[Exatem]

hello to all.I need your help.
for an examination I have to carry out such a transmission.
In practice what I have to do is put the madman.
I thought I would use a system similar to that of the change of
a car putting a creep bearing between the lower shaft
and the wheel conducted and then put a solid sleeve with the lower shaft controlled by a lever that allows me to transfer or not the bike.

What do you say?

If you put a crazy gear, then you have to predict synchronisms to avoid "grated" when you go to insert the marches.
I'll get you a wikipedia extract that explains the operation.the grafting system is a sleeve that runs sideways on a coaxial support to the shaft, the sleeve is flowed by the control forks operated by the gear selector. the support of the sleeve remains supportive to the motor shaft thanks to the millerighe coupling between the two and the gears and thicknesses that do not allow its side shift, the sleeve that is external to this support always has a thousandrighe coupling with its support, but with a greater tolerance, so as to allow the correct lubrication and a smoother sliding. when this sleeve moves sideways with respect to its rest position, you have the return of the small sticks inside the manifold support (these are pushed by springs against the manifold), which serve to stabilize the position when it is in neutral position, moreover the sleeve ingrain the synchronization and pushes it on the gear of the gear, allowing the gear to take to the same rotation speed of the shaft

the synchronizers can therefore be considered as conical or ring minifrictions that carry the sleeve (then the input shaft) and the solid crown to the gear to turn at the same speed, when you feel scratched during a gear change, are not the teeth of the gears to "grat", but those of the sleeve and the crown of the gear, moreover the crown of the gear is sensibly thinner than the contact of the gears

 

[bboyfab]

and there is no other solution instead of using a car change system?

 

[meccanicamg]

a possibility, since I do not subscribe to the text to be interpreted is that you can put a clutch from the motor pulley on the tree that goes to the gear pin.

as regards the sleeve with synchronizer, there is to say that for the disintegration it does not need synchronizer, while the coupling is to be carried out on the motor if you do not want to insert synchronism systems.

If you put the clutch (made in all the ways you want) you can detach and attack the bike with the motor on the regimen. then it is up to you to do the manual or mechanical command, evaluate the graduality of the graft/disconnection etc.

 

[bboyfab]

but from the point of view of costs which of the two solutions is cheaper?

 

[meccanicamg]

but from the point of view of costs which of the two solutions is cheaper?

I think it's the easiest thing to do, and even the cheapest one to create a synchronized gearbox to have a insert/down command.

to more reason if it is a school project it is easier to size and verify a clutch. a change in itself has different robes, synchronization verification, you work in the small and it is not easy to have all the data for fatigue verification and sizing in itself.

You can use a conical clutch mounted on a grooved tree with contrast spring and then the lever that commands you do as you want.

ps: if you ever have to turn the concept if the pot enters z2 and comes out z1

 

[MBT]

attention, conical clutch has the advantage of transmitting a lot more torque than a plain, equal to all the rest
On the other hand, its graft (and disconnection) is much sharper!

 

[bboyfab]

but like a straight tooth front graft without using friction is not feasible?

 

[MBT]

He...
Think about it.
avesti a tree that rotates to say 1000 rpm
another who is still
you would like to make sure that the steady one "gets" and takes itself at the same speed as the one in motion using a straight teeth graft.. .
Yes, it can be done, provided that the speed differences between the two trees are very low and that the inertia of the shaft duct is irrisoria

to make you a comparison... Have you ever tried to change gear in the car without using the clutch?

 

[bboyfab]

I said a big stupid thing!
I think I'm gonna use a conical frizone graft!

thanks to all for advice

 

[MBT]

if it is for ludic-didactic purpose, then good size
if it is to build something.. .
http://www.mwmfrenifrizioni.it/frizioni-pneumatiche-positive.htmhttp://www.ompisrl.com/pneumatiche.htmhttp://www.corbetta.it/prodotti.htmhttp://www.ortlinghaus.com/it/il-nostri-prodotti/frizioni-a-comando-meccanico.htmlhttp://www.baruffaldi.it/

 

[bboyfab]

Thanks for the help and I still take advantage of it to ask if a monodisk dry clutch system costs more or less than a conical firizone.

 

[MBT]

Um...
I don't know if they exist, at least in my memory
You should self-build it, so the discriminant would be the difference in cost between building a flat clutch and a conical...
I believe that in this case the difference makes the mechanical processing, in addition to friction material. . .

 

[bboyfab]

I did some research on the internet and I saw that most motorists
use your own conical clutches!

 

[meccanicamg]

I did some research on the internet and I saw that most motorists
use your own conical clutches!

and then they are beautiful to size and have a very simple mechanics and minor components. and then there are in many texts the explanations.

 

[bboyfab]

if I'm not mistaken the clutch handling takes place through springs... but how are these mounted and how many are there?

 

[meccanicamg]

if I'm not mistaken the clutch handling takes place through springs... but how are these mounted and how many are there?

There are as many as you need to push springs. the command is made to the lever that moves the sleeve on the groove. if you have to make a clutch that hooks and pushes the beam into the female, you will push the male mounted on the groove with compression springs on it.