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Hydraulic cylinder tips part 2

Author : Andrew Delaney Parker Hannifin

14 December 2012

Second in a seven part series of useful tips for hydraulic engineers and maintenance professionals

Andrew Delaney
Andrew Delaney

Pay attention to mountings
Careful attention at the design stage to considerations such as cylinder mounting will have a bearing on the ultimate cost of ownership. Cylinder mountings transmit the force applied by the cylinder to the surface on which it is mounted.

They are responsible for controlling alignment and resisting movement, which would result in eventual fatigue failure. The most efficient transmission of force occurs along the cylinder’s centre line, as with flange-mounted cylinders. Trunnion mounted cylinders also absorb force on their centreline, but lack the rigidity of a fixed mounting. Foot-mounted cylinders do not absorb force on their centrelines and should be firmly secured, using a thrust key for positive location where necessary.

In ‘pull’ applications, where the piston rod is in tension, mounting the cylinder from the head end reduces the forces applied to the cylinder body. In ‘push’ applications, with the piston rod in compression, a cap end mounting is generally preferred.

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