hydraulic spur gear and accumulator studies

[4130 metalworks]

Hi, I am looking for any papers or research done on hydraulics external gear pump heads with spur gears. We are trying to optimise our existing pump by altering tooth counts and clearances. Before spending lots of time and money on prototypes I thought there could be studies already done in this area. Also if anyone has information on coating the internal walls of piston type hydraulic accumulators to help with the stick slip effect.
Thank you

I have posted in another section as well because this relates to multiple sectons

 

[3DDave]

Creating multiple posts creates multiple problems. Pick the best one and stick with it.

I think that the makers of gear pumps have already done this work as would the accumulator makers for their products.