Hydrostatic / Visco-Elastic / Fluid-Elastomer Buffer
Shock reducing elements of LEBEN-Dämpfungstechnik GmbH with integrated spring-damper operating principle known as hydrostatic, visco-elastic, elasto-fluid shock absorbers or fluid-elastomer buffers.
We offer these types in push direction (type designation of series “ED”) and/or in pull direction (series “EZ”).
In general, our fluid-elastomer buffers have the following main components: Reservoir (cylinder), filling preload with a compressible fluid, high pressure sealing system, piston, piston rod and guide bearing.
Variable parameters include volume of the cylinder, diameter of the piston and piston rod, preload and means of throttling, so that the visco-elastic spring-damper perfectly meets the requirements of your application.
- usage in push and in pull direction (“in tension and compression”)
- variable characteristic (linear, progressive, approximately horizontal or degressive)
- small design with high energy absorption
- very high preload of the spring (depending on the application individual reset force of the piston rod)
- integrated spring return without additional gas spring or mechanical coil spring
- highly viscous elastomer fluid can increase leakage safety
- maintenance-free operation
- lower degree of dissipation compared to hydraulic principle (see C-Type and S-Type)
- high preload force of spring possibly problematic
- high pressure of container can increase risk of leakage
- operational push-in cycles of the piston rod at creep speed with low counterforces are not possible in contrast to hydraulic principle (see C-Type and S-Type)
Operating principle of the ED/EZ series:
Highly viscous, elastic fluids make it possible to design fluid-elastomer dampers based on the principle of hydrostatic compression.
Suspension: The movement of the piston rod reduces the volume of the cylinder filled with silicone elastomer. Compression of the fluid results in increased internal pressure and counteracts the movement of the piston. This is referred to as compressibility.
Damping: The movement of the piston creates a flow path (by means of throttle orifices or annular gap) along the piston. The reaction force of the piston due to laminar flow and viscosity depends on the speed of the movement.
Used as a buffer in:
- Railway couplings
- Water locks / sluices
Illustrated hydrostatic buffer:
Damping of the pre-tensioned rope catch (tensioned catch rope) in front of a water lock.
- Total length of the shock absorber cylinder: 3,7 m
- Weight: approx. 1.4 t