Advantages of test hydraulic actuators:
  • short changeover times
  • adjustable working areas for cost reduction
  • compact servo hydraulic cylinder construction
  • efficient for varying test series
  • high stability and rigidity
  • high speeds and lateral forces

Hydraulic test actuators series 320
Test hydraulic actuators with special features

Efficient with varying test setups, compact, versatile, quick, sensitive and robust – the best choice for challenging tasks.

Perfect for highly dynamic industry and test tasks

  • Industrial applications – from friction welding and ingot oscillation to compacting sintered metal
  • Checking the functional safety of systems, component parts or products
  • Structure test of aircraft, automobile exhaust systems, refrigerating compressors and many more
  • Load and movement simulation, e.g. operational profiles and flight profiles
Perfect for highly dynamic industry and test tasks
Hydraulic test actuator for every frequency range and for high lateral forces

The test actuators convince with their stability and high inherent stiffness. They are suitable for high speeds and can reliably bear high lateral forces.

Operation without leak oil pump

Thanks to the elaborate sealing and guiding system, Hänchen hydraulic cylinders don't need leak oil pumps.

Bores with millimetre accuracy

The working areas of the test hydraulic actuator can be designed individually for the respective requirements. This saves acquisition and operating costs for the required periphery and increases the energy efficiency, e.g. with regard to the system's energy input and cooling power.

Modular system for efficient change of applications

Switching between different test setups simply, quickly and cost-efficiently: mounting elements and accessories such as spherical rod eyes, integrated position transducers, force transducers, mounting plates, accumulators or control valves fit hydraulic cylinders with different eliminating extra purchases – optimal utilization of the existing test environment.

Hänchen servo hydraulic actuator
Test actuators exactly as they should be. Perfect.

The performance map of a hydraulic drive describes the dynamic movement of a hydraulic servo actuator in a sine wave. Depending on the cylinder design, different performance classes can be reached.

Your applications aren't that challenging? Then our servo hydraulic actuator series 120 and 300 are just right for you. These are industrial hydraulic cylinders in typical Hänchen quality, of course – high surface quality, geometrical accuracy of the component parts, and coordinated sealing elements – for highest technical requirements and safe, reliably controlled drives. Slim test cylinders for simpler test tasks.


Use our HÄKO product configurator to help you design and calculate the right hydraulic cylinder or test cylinder.

 

 

 

 





  Double-rod cylinder series 320
  Double-rod cylinder series 120 and 300
  Single-rod cylinder series 120 and 300

Lateral force design
Design characteristics of series 320 test actuators

Especially important for designing servo actuators for test systems:
Taking into account the lateral forces acting on the piston rod, and a cushioning to protect the cylinder.

 

Design according to the lateral forces
Lateral forces on the piston rod

An important point to be considered when designing servo hydraulic test actuators is the ability to bear lateral forces or side loads acting on the piston rod. Beside the diameter, the elastic curve of a piston rod under lateral forces depends above all on the stroke length, the free piston rod end and the stroke position. So, the admissible lateral force in the retracted end position will always be higher than in the extended position.

Admissible cantilever forces

  

For the exact lateral force curves for every dimension, please use our Hänchen configurator HÄKO at >> Test cylinders >> Equipment

Transverse forces on the piston rod

Cover design of servo hydraulic test cylinders
Sealing and guiding system in the cover

A dynamic test environment requires free-moving, low stick-slip hydraulic cylinders. Hänchen offers three test cylinder designs with especially low friction. High production accuracy with very little guide clearance guarantees wear-free use and thus a long service life. You'll find further information on the design of the pistons sealing system here.

Servoseal® design
with H-CFK® retaining ring to avoid penetrating oil

The Servoseal® is a dynamically sealing synthetic ring. The integrated retaining ring made of H-CFRP® prevents excessive pressure build-up on the sealing surface due to hydraulic pressure. At small amplitudes, no wear and no scoring is produced on the counterfaces due to lack of lubrication.

Servoseal design
Guiding system cover PTFE wear rings
= contact guiding element
Sealing system of the cover Servoseal®, lip seal, wiper ring
Operating limits

Speed:                2 m/s
Temperature:       80 °C
Friction:               pressure-independent



Servofloat®-design with patented floating gap seal for extremely low friction

In the Servofloat® seal element, the pressure in the cylinder chamber is discharged to the outside in a contact-free through a narrow no-contact throttle gap. This system requires no external pressure supply.

In the Servofloat® seal element the pressure in the cylinder chamber is discharged to the outside in a contact-free through a narrow no-contact throttle gap.

 

Guiding system cover PTFE wear rings
= contact guiding element
Sealing system cover Floating gap seal, functional oil
seal, wiper ring
Operating limits

Speed:                4 m/s
Temperature:       100 °C
Friction:              none



Servobear®-design with hydrostatic piston rod guide for highest side loads

Servobear® combines seal and rod guide. The rod is "floating" on an oil film without touching the guide. The pressure is released through this narrow bearing gap. The pressure supply for the hydrostatic bearing is realized internally via the system pressure.

Servobear® combines seal and rod guide. The rod is "floating" on an oil film without touching the guide. The pressure is released through this narrow bearing gap.

 

Guiding system in cover
Hydrostatic bearing
= no-contact guiding elements
Sealing system on the cover
Functional oil seal,
wiper ring
Operating limits

Speed:                4 m/s
Temperature:       100 °C
Friction:               none

Hydraulics design
Flow rate and emergency cushion

The gap seals used in the test cylinder must be observed when designing the necessary flow rate. The penetrating oil flow in the cover is the one required for the Servofloat® and Servobear® design. On the other hand, a leakage occurs at the piston in the "fitted piston" design. This additionally required oil must be added to the flow rate required for the operation of the test cylinder.

 

Functional oil flow in covers

Servoseal® is a contacting sealing system. Contrary to no-contact systems, sealing takes place without functional oil flow.

The contacting functional oil seal is not pressurised in the Servofloat® and Servobear® designs. The resulting residual friction over the entire pressure range is constant and very low. The leak oil flow must be discharged without pressure into the tank through the leak oil port and should not be extracted.

 

Functional oil flow in covers

 











  Servocop®, Servoseal®
  Servofloat®
  Servobear®
Reference values apply to 210 bar chamber pressure [working pressure], for Servobear® 280 bar supply pressure [system pressure], fluid ISO VG 46 at 55°C

Diagram of leakage oil on piston

The Servoseal® at the piston provides a contact seal on both sides of the chamber. Compared to a gap seal, it provides for very low piston leakage.

Here you can find further information on the design of the sealing system on the piston for piston types used in test engineering.

 

Diagram of leakage oil on piston











  Rectangular compact seal, Servoseal®
  Gap seal
Reference values apply to 210 bar differential pressure at the piston,
fluid ISO VG 46 at 55°C

 

Emergency cushioning
Cylinder protection against unforeseen movement

Every servo actuator of the 320 test cylinder series is equipped with an emergency cushioning in front of every end position. This serves to protect the cylinder.

The length of the emergency cushioning is included in the stroke. The actual stroke without emergency cushioning is called the effective stroke.

Every test cylinder of the series 320 is equipped with a safety damper before each end position

Technical data of test cylinders
Series 320

Type of effect: double-rod cylinder | Sealing systems: Servoseal®, Servofloat®, functional oil seal (Servobear®) | Speeds: up to 4 m/s
Rod Ø
(mm)
Bore
(mm)
Type
 
Force (kN)
210 bar
Force (kN)
320 bar
Stroke
(mm)
 25 28 – 45  strong  3 – 23  4 – 35  50 – 170
 30 34 – 55  strong 4 – 35 6 – 53  50 – 220
 40 45 – 70  strong 7 – 54 11 – 83  50 – 270
 50 56 – 80  strong 11 – 64 16 – 98  50 – 450
 63 70 – 110  strong 15 – 134 23 – 204  50 – 450
 80 90 – 120 slim 28 – 132 43 – 201  50 – 450
 80 90 – 150 strong 28 – 266 43 – 405  50 – 450
 100 110 – 150 slim 35 – 206 53 – 314  50 – 450
 100 110 – 175 strong 35 – 312  53 – 518  50 – 450
 125 140 – 175 slim

66 – 219

 100 – 377  50 – 450
 125 140 – 200 strong  66 – 402  100 – 613  50 – 450
 160 180 – 220 slim  112 – 376  171 – 573  50 – 450


strong: massive construction (e.g. vertical installation)
slim: lighter construction (e.g. horizontal installation with spherical rod eyes)




Test hydraulic actuator with variable piston diameter
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