hydraulik - Jahns-Regulatoren

Output torque:
the output torque must never exceed Tmax. In the event that brakess are mounted on the gearbox or the motor,
one must ensure that the braking torque does not exceed the maximum torque of the gearbox, itself multiplied
by 1,1; with regards to the real braking torque, it is also necessary to consider the Effi ciency of the gearbox; see
part 8.
Input velocity:
must not exceed the maximum gearbox input speed.
Thermal power:
in the event that the installed power is greater than the thermal power of the gearbox, it is necessary to provide a
cooling circuit or to select a larger gearbox. The power to dissipate is:
where P2 is the power transmitted by the gearbox. In the event that thermal power is not exceeded, but the
application is particularly onerous, it may be necessary to install an oil circulation and fi ltering system.
3. Motor selection method
3.1 Hydraulic drives
Knowing the hydraulic circuit pressure, from which the Dp of the motor can be obtained, the torque T1, the velocity
n1 required at the input of the gearbox, the hydraulic motor capacity must be greater or equal to:
where ηm is the mechanical effi ciency of the motor. The necessary supply fl ow rate is:
where ηv is the volumetric effi ciency of the motor. Please use the following table as a guide for hydraulic motor
selections.
Hydraulic motors
Use light medium heavy
Pressure [bar]