mechanical design of a reducer

[MassiVonWeizen]

The problem is that the boy is using autocad. If he used a 3d cad maybe he'd better understand what he's up to.

no it is true; a 3d definitely facilitates, but also with autocad you can simulate the mounts; just create blocks of individual components and simulate assembly.
There are shortcomings dictated by experience, but there are others that an engineer, as defined and I as such the trait, should not have.
no I have to tell you that they have been constructing whole plants with studies and drawings to tecnigraph; the problem is never the means, but for what you use it and how much you know it and draw a reducer with autocad and feasible.

 

[TETRASTORE]

not only screws that hold the lid to the carcass, but you have to add a seal

I do not know if the user has deliberately omitted them, however in current series reducers the liquid seals that in theory do not have thickness and in the design are not recalled.

 

[meccanicamg]

no it is true; a 3d definitely facilitates, but also with autocad you can simulate the mounts; just create blocks of individual components and simulate assembly.
There are shortcomings dictated by experience, but there are others that an engineer, as defined and I as such the trait, should not have.
no I have to tell you that they have been constructing whole plants with studies and drawings to tecnigraph; the problem is never the means, but for what you use it and how much you know it and draw a reducer with autocad and feasible.

as you could see the radiated contour of the bearing makes from one profile....if it was with a 3d... seen that maybe with autocad do not use the blocks, it would still be visible geometry.

Surely, it is not the means it does....so knowledge.... but so you do more trouble thinking about representation 2d when they are actually solids handling.
a human being is more led to handling and reasoning on a 3d rather than on a 2d projection, especially in recent years that in school teach little and bad.

 

[meccanicamg]

Instead, I can't understand the geometry of the toothed wheel 13.
as the "race" has been realized (by race I mean the intermediate part between the hub and the crown of teeth).View attachment 70264I mean, I can't figure out what these circles are. @mario cats Can you tell me?

being cast wheels have flat breeds and at the center of the flat breed there is a round hole.
It is usually an osett of its shape and not a round trip....so a ray trapeze.
here is a drawing taken by the niemann that clearly shows it.

 

[MassiVonWeizen]

being cast wheels have flat breeds and at the center of the flat breed there is a round hole.
It is usually an osett of its shape and not a round trip....so a ray trapeze.
here is a drawing taken by the niemann that clearly shows it.View attachment 70271

It wouldn't have been bad to let him explain to those who did the design that he definitely knows what he represented.

 

[meccanicamg]

regarding the use of o-ring seals here is a representation with three different ways.at the same time observes that the hole in the lid is wider than the screw otherwise it does not pass
Moreover the partially threaded screws you used can not connect the thread but you must stop in the lid, otherwise use screws to all thread.
other thing is the minimum distance from the edge of the seeger with its bevel. you have little meat and seeger does not hold.

 

[meccanicamg]

other problem... .blue zone there is no air axially between wreath and lid.....if it turns gripping everything. must not touch the lid.

other thing the use of two gaskets to a lip turn all two in the direction of seal does not serve much if not to increase friction and heat.tends to mount a double lip that takes away the powder or two opposites with the intercapedine in the middle filled with fat to lower friction and prevent contamination from abroad.

If you put two like this, you have to leave them away and in the middle of doing the removal of the first healing.... might make sense if you turn high and you have no friction problems and you want to zero oil leaks.

 

[Mario Gatti]

I am a three-year student and not an engineer, I was wrong to write “frequented” I wanted to write “frequent”, I didn’t notice before I published

 

[MassiVonWeizen]

I am a three-year student and not an engineer, I was wrong to write “frequented” I wanted to write “frequent”, I didn’t notice before I published

in your profile what is written in the profession voice?

 

[Mario Gatti]

in your profile what is written in the profession voice?

has been correct, I thank all for the precious advice and for the time dedicated to me, I will light the final result of the work with the corrections

 

[Mario Gatti]

in your profile what is written in the profession voice?

Now there is written student actually I wrong to write engineer

 

[TETRASTORE]

tends to mount a double lip that takes away the powder or two opposites with the intercapedine in the middle filled with fat to lower friction and prevent contamination from abroad.

@meccanicamg while confirming your solution for special applications, I would like to point out that in standard industrial gearboxes the solution normally adopted is that of a seal ring with dust lip.
in particular cases the double seal ring is mounted: with lip to dust the external and normal internal one, not as a barrier against any external contaminants, but for greater safety against the possibility of lubricant losses (contained internally) from the sealing ring, then I would leave the two rings in the design of the user.

 

[meccanicamg]

@meccanicamg while confirming your solution for special applications, I would like to point out that in standard industrial gearboxes the solution normally adopted is that of a seal ring with dust lip.
in particular cases the double seal ring is mounted: with lip to dust the external and normal internal one, not as a barrier against any external contaminants, but for greater safety against the possibility of lubricant losses (contained internally) from the sealing ring, then I would leave the two rings in the design of the user.

Of course... but not two ba flanked as he did.

 

[meccanicamg]

I finally found the pictures, because I don't want to draw.
Special bearing sealsthis below is the standard application of roller-adjustable bearings for slow axles, heavy sector not lubricated by oil through pump or slam but grease lubricated. fills with fat the chamber that holds in all senses and lowers the friction coefficient between tree and seals.
if there are disalignments due to bending is quite compensated and does not lose.
the other system I said, is mainly used on slow or fast axes but subject to strong push-ups and high radial games. forced oil lubrication. the first seal is intended to draw in time and the collection channel recovers the gravity drawing by pressing the oil. the second external seal not being under pressure ensures that it does not enter dust and that it does not outgo absolutely oil. works better than the simple coupled with single lip seals.
after which there are the estates not to contact via maze.

 

[meccanicamg]

for the oil discharge cap, look on elesa. are caps din 908 with seal.there are also different plugs as well magnetic that catch the metal impurities of the gears that are eaten.

 

[meccanicamg]

hello to all, I am a student of mechanical ing and attended polytechnic, I would like a comparison regarding the correct representation in 2d of the components with the regulations of the technical representation of this mechanical assembly. the design represents a reducer of a straw

just to give you a hit.... @funghet ha postato una debate with your original design, what was the text of the project.
at least copy without adding errors.. .

 

[TETRASTORE]

to take point can be useful this manual spare parts lists where the saws of the gearboxes are reported.
I have a doubt: it is not @funghet e @mario cats Am I the same person?

 

[TETRASTORE]

Special bearing seals

to broaden the information regarding the seals I attach a page with the possible variations provided in the gearboxes of one of the main gear manufacturers (sew).

 

[MassiVonWeizen]

In the meantime @mario cats of his is not putting anything on us except the first drawing.
not requests for clarification on why a given choice indicated, not an explanation of its technical choices, nothing.

I have a doubt: is it that @funghet and @mario cats are the same person?

they definitely attend the same course and have the same exam being both Apulian.

 

[Mario Gatti]

I will shortly explain everything unfortunately in these days I am very busy for the examination of energy systems and fluid machines, I will explain all my choices so as to give a sense to everything I have done in the design, excuse me