Nominal size
technology are key variables which do not refer to units or dimensions and do not have to be associated with any numerical variable for these devices. Specifically, the nominal size for pumps and motors as per [...] are no standard specifications for valves. It has become normal practice to link the nominal size with the size of the connecting bore. However, it tells us nothing, for example, about the maximum or
Creeping motion
Control process required in a mobile hydraulic drive system — with a specific (mechanical or electronic) relationship between the accelerator pedal position and the movement velocity — where a particular [...] brake if the creep pedal is used to cancel the brake pressure (again via the pivoting angle associated with the pump).
Scraper
wear-resistant, elastic materials with very high hardness (80-90 Shore A) and given a sharp edge to ease the stripping action. There are scrapers made of pure elastomers or with a metal part vulcanised into
Flushing a system
has been achieved ( Figure S 77 ). As with this process, the system pump is completely exposed to contamination, it is recommended to use a flushing power pack with its own pump (normally a gear pump) for
Seal leakage
of fluid on the wall associated with the escape lifts the sealing lip and therefore remains on the surface. When the movement is reversed, this film comes into contact with the harder rear side of the seal
Seal wear
25 to 0.5 μm with a contact ratio t p >50 % or R p <0.5); The thickness of the lubrication film (if the seal scrapes off the lubrication film, boundary friction or dry friction occurs with correspondingly
Volume (bulk) filters
separates contaminations primarily on the inside (bulk) of the filtering material. Filter elements with several layers are used for this and are made of metal powder (sintered filer or fibrous materials [...] the filter. It is therefore misleading if volume (bulk) filters made of non-woven fabrics are marked with a filtration grade (e.g. 10μm).
Delivery flow pulsation
Pumps with a finite number of displacement units (pistons, vanes, teeth) deliver a flow rate that fluctuates around an average value due to the periodic change between the suction and pressure phase. The [...] average value is larger, the smaller the number of displacement units (Figure F 27) . Here piston pumps with an even number of pistons have double delivery flow pulsation (select odd number of pistons!) If the
Closed loop synchronisation control
Closed loop position control system with several actuators that move synchronously. In control systems there are various ways of realising this action: in the simple form the first actuator can be open [...] drive element. It is also possible to use closed loop control for all drives and to operate them with the same setpoint. In addition, the differences between the position actual values (synchronisation
Power density
the device (drive). A high power density thus means that large amounts of power can be transferred with relatively small components.