Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Forging gear

Status
Not open for further replies.
Viet_Doan

Viet_Doan

Automotive
Joined
Jul 29, 2023
Messages
3
Hi everyone i want to ask a question about gear forging gear
i don't really understand what function it is (red mark ).it is for strengthen gear or something else, isn't it ?
1731985948540.png
 
Sort by date Sort by votes
OP
Depending on the material, a forged gear with have higher UT and YT because of grain flow. Than wrought steel, eg bar , plate.
 
Upvote 0 Downvote
The shape is a tradeoff.
You want to use less material to save weight and cost.
But you need some level of stiffness and strength.
 
Upvote 0 Downvote
Well thank you so much
if purpose is to reduce cost, is it possible to remove them ? we have some gears with equivalent function but no this rib
EdStainless said:
The shape is a tradeoff.
You want to use less material to save weight and cost.
But you need some level of stiffness and strength.
Click to expand...
1732065781220.png
 
Upvote 0 Downvote
mfgenggear said:
OP
Depending on the material, a forged gear with have higher UT and YT because of grain flow. Than wrought steel, eg bar , plate.
Click to expand...
thank you so much for explanation.
Is possible to remove these rib? I think we have to face some trouble with strength or manufacturing.
 
Upvote 0 Downvote
OP
Even if it is forged, it still requires extensive machining , heat treating and inspection. Machining gears can be complex. Pull the process planing and all the certs.
 
Upvote 0 Downvote
The gears may mate up to other gears the same, but other thicknesses/geometry could be different to where company A need the rib for strength but company B can get away without it. Metallurgy could also be different. If you would of to try modifying one, I would do extensive testing before moving that to final production.
 
Upvote 0 Downvote
The rib may be required to tune the vibration response of the gearbox/system.
 
Upvote 0 Downvote
Gear rim , in this case rib is added for extra strength for the gear. Thickness of the rim and rib can not enough can result in abnormal vibration and wear to the gear. And the gear box assembly
 
Upvote 0 Downvote
Yes it can be, there many factors, torsional stress, resulting from high torque and rpm, shock, and moment to the box. Like a helicopter gear box.
Or gear box connected to a turbo prop, turbine generator, with extreme torque and rpm.
 
Upvote 0 Downvote
Sorry to open this back up, but this looks like to me a sintered gear? And instead it looks like the concave area outside the diameter of the rib was to reduce the total surface area needing to be ground flat. That inner rib yes would be for strength and stiffness comparative to the concave area, but I'm not sure if that radius is adequate? Given the lack of relevant information, that's an impossible question to answer.

Instead I'm mostly posting to see if anyone can point me to material/references on stress risers for axial faces like in this case, because I realized I don't have any.
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

deepnsteep
  • Locked
  • Question Question
Gear Ratios and BSFC
Replies
9
Views
1K
BrianPetersen
BrianPetersen
Charlie144
  • Locked
  • Question Question
help to finding starter ring gear tooth profile
Replies
3
Views
1K
GregLocock
GregLocock
Joel_Lapointe
  • Locked
  • Question Question
Pressure angle for helical gears, with tangential, axial and radial forces.
Replies
2
Views
1K
pmbrunelle
pmbrunelle
Cool Bananas
  • Locked
  • Question Question
Peerless 100 series gearbox
Replies
7
Views
1K
3DDave
3DDave
Rat5
  • Locked
  • Question Question
Differential crown gear
Replies
6
Views
723
EHudson
EHudson

Part and Inventory Search

Sponsor

Back
Top