Hydraulics calculator / calculate hydraulics

Hydraulic pumps | Gear pump | Hydraulic motors

 

Hydraulik pumps

Measurements and units used

Drive torque  T  Nm
Differential pressure  ∆p  bar
Rotation speed  n  min-1
Geometr. displacement volumeThe volume of liquid in cm³ in a pump or motor displaced by the upward stroke or other cycle during a rotation of the drive shaft. per rotation  Vg  cm3
Power  P  kW
Volume flow rate  qv  L/min
Volumetric efficiency  ηvol
 0,9 - 0,95
Mechanical hydraulicThe use of liquids to transmit force and energy. efficiency  ηmh  0,9 - 0,95
Total efficiency (ηt = ηvol * ηmh)  ηt  0,8 - 0,85

 

qv = volume flow rate in in L/min

Vg=cm3
n=min-1
ηv=(Standard value ca. 0.9–0.95)
  

 

P=kW
Δp=bar
ηt=(Standard value ca. 0.8–0.85)
  

 

 

Vg = geometric displacement volume cm³/U

qv=L/min
n=min-1
ηv=(Standard value ca. 0.9–0.95)
  

 

T=Nm
Δp=bar
ηmh=(Standard value ca. 0.9–0.95)
  

 

n = rotation speed in min-1

qv=L/min
Vg=cm3/revolution
ηv=(Standard value ca. 0.9–0.95)
  

 

P=kW
T=Nm
  

 

T = torque in Nm

Vg=cm3
Δp=bar
ηmh=(Standard value ca. 0.9–0.95)
  

 

P=kW
n=min-1
  

 

∆p = differential pressure in bar

T=Nm
ηmh=(Standard value ca. 0.9–0.95)
Vg=cm3
  

 

P=kW
qv=L/min
ηt=(Standard value ca. 0.8–0.85)
  

 

P = power in kW

T=Nm
n=min-1
  

 

qv=L/min
Δp=bar
ηt=(Standard value ca. 0.8–0.85)
  

 

Gear pump

Measurements and units used

Geometr. displacement volume per rotation   Vg 
  cm3
Gear pump diameter   D   cm
Length of bore in pump casing   L   cm
Gear width   W   cm

 

Berechnung Zahnradpumpe

Conveyed volume calculation for a gear pumpThe oil volume enclosed in the gap between teeth is conveyed from the intake to the discharge side of the pump by the turning of the gear, displaced to the contact point of the wheel and forced into the pressure connection. per rotation (cm³)

D=cm
L=cm
W=cm
  

 

Hydraulic motors

Measurements and units used

Drive torque  T  Nm
Differential pressure  ∆p  bar
Rotation speed  n  min-1
Geometr. displacement volume per rotation  Vg  cm3
Power  P  kW
Volume flow rate  qv  L/min
Volumetric efficiency  ηvol  0,9 - 0,95
Mechanical hydraulic efficiency  ηmh  0,9 - 0,95
Total efficiency (ηt = ηvol * ηmh)  ηt  0,8 - 0,85

 

q v = volume flow rate in in L/min

Vg=cm3
n=min-1
ηv=(Standard value ca. 0.9–0.95)
  

 

P=kW
Δp=bar
ηt=(Standard value ca. 0.8–0.85)
  

 

V g = geometric displacement volume cm³/U

qv=L/min
n=min-1
ηv=(Standard value ca. 0.9–0.95)
  

 

T=Nm
Δp=bar
ηmh=(Standard value ca. 0.9–0.95)
  

 

n = rotation speed in min-1

qv=L/min/revolution
ηv=(Standard value ca. 0.9–0.95)
Vg=cm3
  

 

P=kW
T=Nm
  

 

T = torque in Nm

Vg=cm3
Δp=bar
ηmh=(Standard value ca. 0.9–0.95)
  

 

P=kW
n=min-1
  

 

∆p = differential pressure in bar

T=Nm
Vg=cm3
ηmh=(Standard value ca. 0.9–0.95)
  

 

P=kW
qv=L/min/revolution
ηt=(Standard value ca. 0.8–0.85)
  

 

P = power in kW

T=Nm
n=min-1
  

 

Δp=bar
qv=L/min
ηt=(Standard value ca. 0.8–0.85)
  

Calculate hydraulics quickly...

 

HK Hydraulik GmbH offers all professionals and interested parties ready-made calculators for the most important hydraulic calculations.

 

Until now, to calculate the Volume flow rate or conveyed volume of a gear pump, technicians had to look up the formulas, pick up a calculator, enter the calculation according to the formula, and recalculate it again to check as a precaution. This could take a whole 15 minutes.

 

Now you just have to enter the values you know / have calculated / measured into the relevant calculator module, and you get your result straight away.

 

Please note: when we suggest standard values, this gives you a very close approximation that is good enough for general use. You can of course also enter the actual values instead of the standard values.

 

Our tip: bookmark this page on your workshop computer or smartphone. We are delighted if we can help you with our hydraulics calculator.

 

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