A SAFER APROACH TO CUSHIONING…

A SAFER APROACH TO CUSHIONING

3 Years ago Vega started commercialising an all-new Tie Rod Cylinder, named V210CR. This Hydraulic Cylinder has specs higher than our former Tie Rod Hydraulic Cylinders. Today we shed some light on the Cushioning of this Cylinder. We believe we designed a GOOD product!

The Cushioning effect is well known and widely used in general hydraulic applications. Maybe mold makers use it to a lesser extent. It is very useful when piston speed is higher than 0.1 m/s and the mass connected to the cylinder is not negligible. More info in the catalogue.

Cushioning allows kinetic energy absorption jus by trapping oil in a virtually closed volume (at the end of the stroke), and letting it flow out through a very narrow passage. The increase in oil speed (to the square) thus obtained, generates a pressure drop. This latter, multiplied by cushioning length, shall match the energy to absorb.

Of course, VEGA design optimisation during V210CR Tie Rod Cylinder’s Project allowed a BIG improvement on the following features:

  • constant absorption force along cushioning stroke,
  • an easy adjustment of the cushioning effect,
  • safety against cushioning pin over-opening, and
  • fast re-start in the opposite direction.

The schematic below shows cushioning principle, as an example, at cylinder rear.

Cushioning

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