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2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic actuators:
cylindersCylinder types:Single acting: work can be done only in one
directionPistonDouble acting piston:Piston rod on both
sidesPlungerWork is done in both directionsTelescopicTelescopicFast
movingTandemFast moving
Hydraulic and Pneumatic Systems
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2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersHydraulic cylinderHidraulikus munkahengerekRgztplcs
kivitel 1.Rgztplcs hidraulika henger, a hengerfejen tallhat karims
rgztssel
Hydraulic and Pneumatic Systems
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2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersHydraulic cylinderHidraulikus munkahengerekHengeres
kivitel 1.Hengeres ptsi mddal kszlt hidraulika henger
Hydraulic and Pneumatic Systems
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2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersProperties:The cylinders have to be good quality steel
with close tolerances.There have to be good sealing both at the
piston rod and at the cylinder.With time dirt may come in and
damage the surfaces. This has to be possibly reduced.In this case,
the leakage will increase all the time.
Hydraulic and Pneumatic Systems
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2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersCalculation of cylindersfriction forcesinertial
forcesmaximum loadslow motion, can be often
neglectedBackward:Outward:
Hydraulic and Pneumatic Systems
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2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersCalculation of cylindersHydraulic cylinders should be
possibly operated in the 3rd region for smooth operation.If the
cylinder is new, the leakage losses are negligibly small so that:c
= mechStick-slipTransitionNormal behaviourat higher pressures
Hydraulic and Pneumatic Systems
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2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersChecking for bucklingn: safety factor: 1-3,5lk: buckling
lengthI1: moment of inertia of the piston rodE: elasticity modulus
of the rod materialMaximum permissible force:
Hydraulic and Pneumatic Systems
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2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersCushioning of cylinders:A hard impact of the piston at the
end surfaces has to be inhibited kinetic energy has to be
absorbed.This is done by increasing the hydraulic resistance at the
end of the stroke.
Hydraulic and Pneumatic Systems
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2005/2006 I.Hydraulic and Pneumatic Systems*Rotary hydraulic
actuatorsSwivel vane rotary actuator:Limited angle in both
directionsMaximum angle always smaller than 360The same torque in
both directionsPiston rotary actuator:With rack and gear
couplingHere maximum angle may be larger than 360Mindkt irnyban
azonosan mkd hengerrel s fogaslces meghajtssal mkdtetett
toldugattys lenghajtsPrhuzamdugattys lenghajtsForgdugattys
lenghajts menettel mkdtetett meghajtcsappalLimited angle rotary
actuatorLimited angle rotary actuatorParallel piston rotary
actuator??????
Hydraulic and Pneumatic Systems
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2005/2006 I.Hydraulic and Pneumatic Systems*Big picturesEnd of
normal presentationBeginning of big pictures
Hydraulic and Pneumatic Systems
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2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersCylinder types: plungersmaller force, better efficiency,
axial support is necessary but cylinder does not have to be so good
qualityWithout inner bufferWith inner buffer (pilot piston)
Hydraulic and Pneumatic Systems
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2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersCylinder types: piston, single acting,
pressing-cylinderSpringinsideoutside
Hydraulic and Pneumatic Systems
-
2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersCylinder types: piston, single acting,
pullerSpringinsideoutside
Hydraulic and Pneumatic Systems
-
2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersCylinder types: piston, double actingVelocity is
different
Hydraulic and Pneumatic Systems
-
2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersCylinder types: piston, double actingPiston rod on both
sideVelocity is the same in both directions
Hydraulic and Pneumatic Systems
-
2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersCylinder types: piston, double actingPiston rod on both
sideVelocity is different in the two directions depending on cross
section ratio of the rods
Hydraulic and Pneumatic Systems
-
2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersCylinder types: double acting piston, tandem
Hydraulic and Pneumatic Systems
-
2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersCylinder types: single acting, fast moving
Hydraulic and Pneumatic Systems
-
2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersCylinder types: double acting, fast moving
Hydraulic and Pneumatic Systems
-
2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersCylinder types: telescopic, single actingLarge working
paths or limited space
Hydraulic and Pneumatic Systems
-
2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersCylinder types: telescopic, double actingLarge working
paths or limited space
Hydraulic and Pneumatic Systems
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2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersChecking for buckling:Eulers casesPictureFree buckling
lengthManner of end fixing
Note1. Case
One end freeOne end fixedOr trunnion at endmounting
stylemounting stylemounting style2. Case
Two ends pivoted and guided
3. Case
One end guided and pivoted, other end fixed4. Case
Two ends fixed and guided
mounting style
Hydraulic and Pneumatic Systems
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2005/2006 I.Hydraulic and Pneumatic Systems*Hydraulic
cylindersCushioning of cylinders:PistonCushion noseCylinder
capStroke volumeCushion orificeThrottleCushion adjustment
screwMotherNon-return valveGas valve
Hydraulic and Pneumatic Systems
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2005/2006 I.Hydraulic and Pneumatic Systems*Rotary hydraulic
actuatorsParallel piston rotary actuator
Hydraulic and Pneumatic Systems
-
2005/2006 I.Hydraulic and Pneumatic Systems*Rotary hydraulic
actuators???
Hydraulic and Pneumatic Systems
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2005/2006 I.Hydraulic and Pneumatic Systems*Rotary hydraulic
actuatorsRack-and-pinion piston-type rotary actuator:
Hydraulic and Pneumatic Systems
-
2005/2006 I.Hydraulic and Pneumatic Systems*Rotary hydraulic
actuatorsLimited angle rotary actuator:
Hydraulic and Pneumatic Systems
-
2005/2006 I.Hydraulic and Pneumatic Systems*Rotary hydraulic
actuatorsLimited angle rotary actuator:
Hydraulic and Pneumatic Systems
-
2005/2006 I.Hydraulic and Pneumatic Systems*Rotary hydraulic
actuatorsHelix actuator:
Hydraulic and Pneumatic Systems
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