Gearbox Lubrication Calculations

[pakgears]

I have very little experience/knowledge of fluid flow calculations and I would like some help answering some questions that were posed to me. These questions concern a gearbox with a gerotor oil pump used for gear mesh spray lubrication.

Here is what I know:

The sump from which the pump draws is constantly replenished. Oil enters the pump through a Ø.50" hole. The pump is running at 7000 rev/min. The pump's theoretical displacement is 0.325 in³/rev. Oil exits the pump through a Ø.50" hole. After exiting the pump, the oil enters a sprayer with two exit holes, each Ø.063" in diameter. The oil is SAE Grade 75W-90, viscosity index 106 cst @ 40°C and density 0.859 kg/l. Let's assume an oil temp. of 40°C.

From this information, can I calculate the oil pressure in the line between the sprayer and the pump? If not, what else do I need to know/define? If I can calculate the pressure, how is it done? Let's assume I can neglect piping losses, if that helps.

Thanks in advance for any help.

 

[crysta1c1ear]

See

http://www.eng-tips.com/viewthread.cfm?qid=188583&page=1

which seems to be a copy of the same question, as if a student is desparate to get his homework done for him.

And, funnily enough pakgears seems to have just registered, which is a typical feature of student homework questions.

 

[pakgears]

Thanks for posting, crysta1c1ear. Yes, the question was posted in two forums. I am just trying to plug into two sets of experts because I thought the question was applicable to both pump and piping engineering, two fields in which I hold no claim to much knowledge - that is why I am writing and why most people write from what I have seen. If this is not an accepted practice, I apologize. I am not clear on the purpose or intent of your post. Can you help me answer the questions I posed?

 

[pakgears]

Also, crysta1c1ear, I am not a student in the academic sense anymore. I do try to learn something new every day, however, and I look forward to any help you can provide regarding my questions!