What do you call this long angled gear piece?

[Wo Wala Moiz]

 

[Baluncore]

They are pinions;
or planet gears, orbiting a sun gear.
They are not so much long, as they are wide, the width is measured along one tooth.

 

[Wo Wala Moiz]

That doesn't get me results on Google images of similar gears. I'm talking about the individual gear pieces.

They are pinions;
or planet gears, orbiting a sun gear.
They are not so much long, as they are wide, the width is measured along one tooth.

 

[Baluncore]

That doesn't get me results on Google images of similar gears.

Then provide more information.
Where is the picture from?
Why are you interested in that geometry?

 

[Baluncore]

There is a high-speed skewed planetary gear arrangement, pictured at the end of this article, under the heading "Keeping it Quiet and Cool".
https://www.machinedesign.com/mechanical-motion-systems/article/21834331/planetary-gears-the-basics

 

[tech99]

View attachment 356406

Helical pinion.

 

[Wo Wala Moiz]

Then provide more information.
Where is the picture from?
Why are you interested in that geometry?

I just want to know what the individual gears are called.

The reason is that I want to ask a question about their performance if they were used in place of traditional propellers.

 

[Wo Wala Moiz]

Helical pinion.

The typical helical pinion isn't long enough. Isn't there a specific name for such long helical gears?

 

[Rive]

Isn't there a specific name for such long helical gears?

Art. Based on a hyperbolic (or: hyperboloidal) planetary gearset.
You are also free to call it as 'nightmare of mechanical engineers', if you wish.

 

[Wo Wala Moiz]

Art. Based on a hyperbolic (or: hyperboloidal) planetary gearset.
You are also free to call it as 'nightmare of mechanical engineers), if you wish.

Hyperbolic gears are narrowed in the middle.

 

[Rive]

Hyperbolic gears are narrowed in the middle.

 

[Wo Wala Moiz]

Fair point, but this was the best image I could find for what I'm actually looking for- a long cylindrical gear with angled teeth.

 

[Baluncore]

Application: turboprop. Efficient gas turbine engines, rotate too fast to drive an efficient propeller, without a reduction gear.

A hyperbolic pinion gear looks difficult, but it is generated simply from straight lines of contact between gear pairs.

A gear is made wider, when it needs to be strong and reliable. Notice that the teeth on the gear are helical-cut, so they overlap by only one. That will be quieter, because only the lubricated point of contact or separation will generate noise, while the line of contact spreads the contact force, lowering the pressure.

Planetary gears are balanced and enclose the reaction forces between the gear shafts. Many teeth are acting at one time to transfer the forces.

 

[sophiecentaur]

This looks like a graphic. Does anyone have a photo of a 'real one"?

 

[Rive]

long cylindrical gear

The issue is, that the image is made as an art/simulation. Where this kind of setup is chosen the torque (or speed, or size) usually does not allow those long, thin gears (subject to bending and related wear) with enhanced visual impact.

(source)

(source)

 

[Lnewqban]

The reason is that I want to ask a question about their performance if they were used in place of traditional propellers.

Are you thinking along this line?:
https://en.wikipedia.org/wiki/Screw_pump

 

[Wo Wala Moiz]

Are you thinking along this line?:
https://en.wikipedia.org/wiki/Screw_pump

No, screws cause more drag. Conventional propellers started off as screws with one half turns.

Conventional propellers, however, have variable thrust with distance from the centre, which can cause the speed of sound to be broken towards the tips, causing high drag.

The idea of using a long, angled gear for an alternative propeller is so that we can have constant thrust across the area of the propeller.

 

[Lnewqban]

The idea of using a long, angled gear for an alternative propeller is so that we can have constant thrust across the area of the propeller.

Interesting idea.
In that case, the original picture is not precisely what you need.
If you don’t need to reproduce the profile of involute teeth, the machining of the parts could be very much simplified.

 

[Baluncore]

The idea of using a long, angled gear for an alternative propeller is so that we can have constant thrust across the area of the propeller.

The long thin planet gears are normally trapped between the sun and the ring or crown gear, so it does not flex. Without the outer ring gear, there is nothing to stop the flex, or to maintain tooth engagement.

Cutting hyperbolic gears, with any tooth profile, is a job for Wire EDM.

 

[Wo Wala Moiz]

Interesting idea.
In that case, the original picture is not precisely what you need.
If you don’t need to reproduce the profile of involute teeth, the machining of the parts could be very much simplified.

View attachment 356498

The picture was simply the best visualisation of what I meant. I'm thinking of an angled gear that is long, with the teeth between 45 and 90 degrees to the airflow.

 

[Rive]

teeth between 45 and 90 degrees to the airflow.

I think that line of thinking is more aligned with axial compressors than gears.
You may find better matches on that line.
Apparently, 'gearing up' given you a very misaligned start here.

If it's a long single stage (more gear-like) then you'll have to think a lot on the change of pressure.
Also, there is a reason why it's not a continuous gear 'teeth'.

 

[Wo Wala Moiz]

I think that line of thinking is more aligned with axial compressors than gears.
You may find better matches on that line.
Apparently, 'gearing up' given you a very misaligned start here.
View attachment 356526
If it's a long single stage (more gear-like) then you'll have to think a lot on the change of pressure.
Also, there is a reason why it's not a continuous gear 'teeth'.

Axial compressors are meant to increase density of the air.

My concept is meant to maintain continuous speed and pressure across the "blades".