How to determine hole diameter in an oil jet? (For bearing lubrication) 1

[spggodd]

Hi guys,

I'm trying to work out the size hole I will need to put into a small oil jet to lubricate a bearing correctly.

I know the pressure of the flow and the flow rate needed.

Is there a "flow through an orifice" type formula I can use to figure this out?

[Metric units would be awesome if possible!]

Thanks
Steve

 

[Oldhydroman]

Use Q = Cv * Pi/4 * D^2 * (2 * P/rho)^0.5

Use SI units throughout

Q = flow in m³/sec
Cv = flow coefficient - use 0.8 for a typical drilled orifice
D = orifice diameter in metres
P = differential pressure across the orifice in N/m²
rho = fluid density in kg/m³

 

[spggodd]

Thank you very much, i will give it a go and see what I come up with.

Thanks again
Steve

 

[spggodd]

Would you also happen to know the calcualtions for determining oil flow required between 2 meshing spur gears?

 

[Oldhydroman]

Sorry - can't help with that question, but you might have some success posting on the tribology forum or the gear and pulley engineering forum.

Good luck