Internal power split
As far as hydrostatic transmissions with an internal power split are concerned, the input torque from the drive motor is fed through the transmission using mechanical means only, while hydraulic torque
Staged switch motor
Hydraulic motor with a larger number of displacement units , which are pooled into two or three groups and can be switched in order to achieve different displacement and therefore different speeds. The
Interference response
on the system. Interference response of a controlled subsystem : Transfer function of the subsystem with respect to changes to the disturbance variable ; Interference response of a control circuit : Behaviour
Open centre system
delivery flow from the constant pump passes through all the valves . Very high flow losses can occur with open centre systems. Opposite: closed centre system .
Logic diagram
Neutral representation of a circuit diagram (for a function sequence) in accordance with IEC (DIN 40 700). The logic diagram is not specific to any component, i.e. it applies to hydraulic, pneumatic or
Hydraulic resonance frequency
stability of a hydraulic system. Whatever applies to this also applies to general natural frequency . With hydraulic drives, it is more or less equivalent to the natural angular frequency because of their
Axial gap compensation on gear pumps (so-called gap compensation)
pressure-controlled leakage that occurs here can be reduced if the clearance gap at the side is reduced with increasing pressure. The axial compensation is undertaken by springs that press the bearing bush or
Analogue computer
among others; the problem as a whole is represented here. Analogue computers are progressive computers with continuous comparison values and operate dynamically, unlike digital computers. Analogue computers
Single edge control
of the speed of a cylinder via control edges. Every displacement chamber has two flow resistances. With the single edge control one resistance can change, the second resistance is however constant (Figure
Internal fluid admission
discharge of the pressure fluid in pumps/motors through the inside of the displacement unit. For example, with valve plate controlled radial piston machines where the pistons are supported at the (outer) stroke