displacement of gear pump

The volume between two teeth of the driven gear times the number of teeth on the driven geat times RPM times two.

Interesting.

How to find the volume between two teeth, using parameters like, 'root dia, tip dia, number of teeth etc'? Any empirical ratio available?

Use the polar integration method on the tooth evolvent profile

How about the leakage? These pumps I thought were incredibly inefficient or am I wrong? Maybe with modern techologies ok, my memory on them is at least 25 years old.

I thought that is why they invented vector pumps, they don't leak and are very precisly dosed.

External gearpumps are used also in todays hydraulic systems up to 200 Bars

The housing in de gearpump is hydraulical ballanced so the sides off the gear has a minimal lekkage.

Averidge efficiency 80-90 Percent.

Gearpump Volumetric efficiency 85 up to 96%

Vanepump Volumetric efficiency 85 up to 93%

Pistonpump Volumetric efficiency 95 up to 98%

The lekkage in a gearpump is depending on the tolerances in the pump and so the costs off the pump. Often we measure 98 Percent flow off the theroretical flow @ 75% off the maximum allowed pressure with 2000-3000 raves

Older pumps will be changed out with 15 % leakage

Depending on Brand. Displacement(V)= Flowrate X 100 / revolutions X efficiency

Br, Harmen Beskers

most are closed looped for accuracy if required - ie.. flow meter feeds back to a frequency drive on the motor to adjust the rpm and correct the flow

could you pls tell me what is a vector pump..and what ensures that they dont leak....thx

gear ratio ! from that you can find displacement given by the manufacturer