Secondary adjustment of hydrostatic transmissions
and a variable motor, which performs the torque setting itself. This results — at constant pressure — in a declining torque at an increasing rotation speed and –– theoretically –– a constant output (this
Accumulator losses
accumulator — regardless of the size of the current pressure required = load pressure p L –– is always charged up to the upper operating pressure p 2, during the removal, larger power losses P v arise as
Built-in dirt
This casual term covers all particles of dirt that - unlike debris - enter the system during the manufacture and assembly of the devices in the system. These include above all casting sand, welding slag [...] slag and chips. This built-in dirt must be removed at the latest prior to commissioning. For this purpose often a separate flushing power pack is used.
Seals
pressure equalisation between two chambers at different pressures and that are connected together by gaps. For this purpose non-contact seals ( gap seals ) or - more often - contact seals are used (Figure D 16)
Impulse resistance of hoses
Resistance of pressure hoses to pressure impulses. This is used — based on the max. permissible operating pressure — to determine the number of impulses required before the hose fails.
Leakage line
leaked fluid to the container. Its dimensions should ensure this is possible at all times with hardly any pressure — even at low temperatures.
Hydraulic actuation
Actuation whereby switching movements are triggered by a flow of hydraulic oil and - depending on the design - the pressure alone or a combination of pressure and flow rate take care of actuation.
High torque motors
Term for — mainly slow-speed — hydraulic motors with very high displacement and therefore very high torque. High torque motors are generally designed as multi-stroke hydrostatic motors in terms of the
Neutral position of the pump
position of the pump, i.e. the position in which the pump covers the leakage losses incurred, is – incorrectly – labelled the pump's neutral position.
Nominal operating conditions
Conditions for which a device has been designed based on its application. The details — if not already specified in standards — are generally set out in manufacturer's catalogues and identified via the index