applications for gearboxes

[meccanicamg]

then my question continues to be this, if besides the choice of the gear motor outside the gearbox you can apply further gears? Usually in conveyor belts are applied chain gears or seldom belts but never dense wheels, from what I saw in industrial machine explosions I found that are rare applications of gear pairs further applied to the gear motor to the same....

if at the exit of the gear motor there must be a pair of pulleys with belt or two pinions with chain will make the appropriate calculations of the straps or chains. on the manuals of the serious builders there are formulas to check for example the chains according to all variants.

 

[meccanicamg]

and then would there not be a constraint that limits on the choice if to insert a gear motor or a simple transmission of toothed wheels? because in theory it should be enough only the gear motor if it is to put gears, then in the design of machines I do not see then the reason to dimensional the wheels or calculate the module to resistance and possibly to choose it to catalog, since and often preferable the choice to the catalog of the gear motor instead of the use of pairs of dense wheels.

I honestly didn't understand the concept.
the pulleys for belt does not dimensional but the straps yes. chain pins do not size but chains do.

 

[carlo23]

I honestly didn't understand the concept.
the pulleys for belt does not dimensional but the straps yes. chain pins do not size but chains do.

what I wanted to say and that if you put motor gears, then it would no longer make sense to insert other pairs of gears to design at resistance because they are already included in the gearbox. . chains or straps I have seen that you use more often than gears this I wanted to say too.. .

 

[meccanicamg]

what I wanted to say and that if you put motor gears, then it would no longer make sense to insert other pairs of gears to design at resistance because they are already included in the gearbox. . chains or straps I have seen that you use more often than gears this I wanted to say too.. .

generally would not need to add other pairs of gears. if you make special machines, where there is need you can well make a pre-pair with epicycloidal gearbox and then maybe two stages of custom built cylindrical gears. often happens if you need a gearbox with special signatures, on which there are mounted arms, pushers, special equipment.

just to give you an idea, this is a coil aspo in sheet metal. has two pairs of gears inside the case. then if you need to make a higher relationship you put out between the engine and the case a gearbox from business.image taken from qui.

 

[carlo23]

then the reducer by trade can size the module and choose it?

 

[PIETRO2002]

then the reducer by trade can size the module and choose it?

Look, carlo, don't you think you're overreacting now?

 

[meccanicamg]

then the reducer by trade can size the module and choose it?

No. no one knows what's inside, what form has, how much teeth it has. often in the catalog give you a reduction report that is not the real one but is the "nominal".

But what do you not understand? the commercial gearboxes take you for the performance they do.....point and just.

If I build heavy steel machinery I need a reducer that has 6 outputs I build it myself, I size everything myself, gears as I want (module, propeller, width, materials, then maybe the trunks as well as the head diameter of a few mm because I don't want you to touch the gear close with which you don't have to gear etc.), I study the trees, flexions and tensions. I study the blockings, the bearings and calculate the duration.....look that the bearings do not dimensional the spheres....but there are formulas that consider the load, the load of the bearings, lubrication etc....the same thing of the gears. I'm not planning a bearing that sells them already.

 

[carlo23]

thank you now and all clear... thanks again mechanicalmg and to tt you heart carlo. .

 

[TETRASTORE]

carlo23, I suggest you read this document well; Perhaps you can clarify the differences between the various types of transmissions.

 

[carlo23]

Thank you very much. .

 

[carlo23]

hi tetrastore, I studied the choice to the catalog of gear motors, what I came to ask you is this. if I consider the choice of the gearmotor based on the power number of turns and reduction ratio to the catalog, but in the machine to be designed I can choose the gearmotor but the choice is not able to satisfy the required reduction ratio, then outside the gearbox I can design a pair of dentate wheels so as to correct the reduction ratio and possibly bring it to the required one?

 

[@ndreaR]

hi tetrastore, I studied the choice to the catalog of gear motors, what I came to ask you is this. if I consider the choice of the gearmotor based on the power number of turns and reduction ratio to the catalog, but in the machine to be designed I can choose the gearmotor but the choice is not able to satisfy the required reduction ratio, then outside the gearbox I can design a pair of dentate wheels so as to correct the reduction ratio and possibly bring it to the required one?

hi carlo, if you want very push reduction reports you can opt for an endless screw reducer, keeping in mind that with a choice of this type the transmission performance tends to become much lower.
What you say to me is feasible but personally I see it very complex and above all uneconomic.

 

[carlo23]

Thank you.

 

[@ndreaR]

to adjust you can make a first reasoning like this:
1) for gears with cylindrical/conical gears the maximum reduction for a single stage is about 1:8 with yields (if the fabrication according to art, correct lubrication etc.) about 98%. Consider that this data in reality varies from the provider that contacts.
So for example if I need a reduction of 1:20 I will need two stages of reduction.
2) for gears with endless screw gears and helical wheel you can also get a reduction of 1:200 however with very minor yields that can fall even to 40/50 %
for this type it is also necessary to make evaluations on the retrograde motion.

 

[carlo23]

ok andrea, what I was interested in understanding was this, that is in addition to the choice of the gear motor from the catalog through nominal power turns per minute and reduction ratio, if the reduction ratio does not meet the design of the machine, my question was if I could insert designing a further pair of geared wheels outside the gearbox so as to bring the reduction ratio of the gear to the one required in case it does not match the one required of the machine in output. and therefore design the module of the resistance pinion and if they extend some pairs of gears in the catalog I go to look for the right couple according to the module, if not the project I. That's what I was asking if it was possible to do it.

 

[TETRASTORE]

but the choice is not able to satisfy the required reduction ratio, then outside the gearbox I can design a pair of dentate wheels so as to correct the reduction ratio and possibly bring it to the required one?

Yes. obviously depends on the type of application.
with external reductions (pignon-catena or pair of gears) you can use smaller gears because the nominal torque required by the application will be divided for the external reduction ratio.

I have prepared a document, which I attach, where you can see various possibilities of linking a reducer.
the choice of one compared to the other depends on a number of factors to consider during the design. eg.:
- location where to place the reducer
- version
- swallowing
- ease of assembly
- economics; not only of the reducer, but also of the application system
- maintenance
- lubrication
- reliability

 

[carlo23]

great tetrator for the answer, thank you very much again to you and gorea, I am happy for this precious forum, a heartfelt thank you ancora still to tt

 

[TETRASTORE]

p.s. I apologize, I rearrange the last drawing (which I attached in post #36) where I corrected a refuso: in figure tca04 the shaft output is hollow passing and not protruding.

 

[@ndreaR]

p.s. I apologize, I rearrange the last drawing (which I attached in post #36) where I corrected a refuso: in figure tca04 the shaft output is hollow passing and not protruding.

I wanted to ask you a consideration because now I have a doubt too. if the only bond is that relating to the transmission ratio: when is it better to do an external reduction rather than contact another supplier and take the appropriate gearbox? . in the sense, in the end if I buy the gear motor I just have to perform a correct installation while if I want to achieve an external reduction I have to make a project, which is much longer and laborious.
Obviously I understand that if there are spaceways an external reduction (with a belt transmission for example) may be necessary but in the case of the only limit on the transmission ratio it is not clear to me.

 

[carlo23]

I think a designer can be free to realize what he believes, according to the customer's request, to me they told me so, then I am a junior figure