Rodless cylinder
has a normal cylinder tube and takes on the load via a permanent magnet. Figure K 20: Control of a rodless cylinder Figure K 21: Types of rodless cylinders [...] piston sides are the same size, making it easy to insert the pistons inside a pneumatic spring (Figure K 20) . In this form, the pneumatic cylinder has found favour in a range of new applications. The oldest [...] the sealing band cylinder whereby a slotted cylinder tube is sealed using steel sealing bands (Figure K 21 c) . The cylinder with actuating band or cable (a and b) is based on closed cylinders, which gives
Ratio of piston areas α
Fluidlexikon Ratio of piston areas α Relationship between the piston area A K of a differential piston and the annular area A{P} R (Figure K 15):
Kv factor (speed/stroke gain)
Figure K 42 ). Kv is also a measure of the stiffness and accuracy of a drive. Kv is limited by the stability of the control circuit, which can be simplified and calculated as follows ( Figure K 43 ): At [...] (speed/stroke gain) is limited by the natural angular frequency ω e. Figure K 42: Influence of Kv on system stability Figure K 43: Damping based on Kv
Bulk modulus
in advance, i.e. the compression volume V k = V o – V (Figure K 26) , all that is required is the "average" bulk modulus: where V o = volume under pressure, Δ V k = compression volume. The size of the bulk [...] therefore, the bulk modulus is often 1.0 to 1.2 x 105 N/cm2 (see also equivalent bulk modulus ). Figure K 26: Definition of the average or real bulk modulus
Cost of a fluid power plant
power plant The overall costs for a plant consist of the procurement costs A, ( Figure K 33 ) and operating costs K, which can fluctuate considerably in the field of hydraulics. They will depend primarily [...] of purchasing a plant whether they want to save costs in terms of procurement or operation. Figure K 33: Relationship between procurement costs and operating costs for a hydraulic system
Combined piston
pot seal or the like and combining the functions of a piston, piston guide and seal (Figure K 24) . Figure K 24: Combined piston
Short stroke cylinder
y shorter than the piston diameter ( Figure K 41 ). Short stroke cylinders are used in hydraulics for things like tensioning or closing processes. Figure K 41: Short stroke cylinder
Compressibility
mineral oil is also dependent on the temperature and the kind of change of state involved (Figure K 25) . Figure K 25: Reduction in volume for an oil
Integral hydrostatic transmission
are designed as an integral hydrostatic transmission whereby both units are adjustable (Figure K 23) . Figure K 23: Integral hydrostatic transmission
Force gain Eo
control spool deflection for a continuously adjustable valve if the drive is retained ( Figure K 34 ). Figure K 34: Force gain