Engineering Mechanics

Proceedings Vol. 21 (2015)

ENGINEERING MECHANICS 2015

Copyright © 2015 Institute of Theoretical and Applied Mechanics, Academy of Sciences of the Czech Republic, v.v.i., Prague

 

M. Kubík, I. Mazůrek, O. Macháček
pages 170 - 171, full text

The published paper deals with the decreasing of sliding friction in hydraulic cylinder with double-ended piston rod. The hydraulic cylinder extrudes oil through the throttling gap placed in the external bypass, and so the throttling gap works as a hydraulic damper. Commercial hydraulic cylinder is the simplest way to ensure the fluid flow through the bypass. The hydraulic piston is manufactured with minimal leaking around the piston rod and maximal sealing of the piston. It results in high friction losses particularly caused by piston and piston rod sealing. This causes the undesired increase of force in whole range of velocities. The main goal of this paper is a proposal of suitable design and material selection which decreases friction losses. The measurement of all components, which contribute to the increase of shear friction, is described (piston rod sealing, piston sealing, dust cover, sliding tapes). The piston rod sealing has a significant effect on the total frictional force. New seals were designed and measured. The material NBR with suitable design modification of seal preload is the best solution for low shear friction operation of hydraulic cylinder.

Text and facts may be copied and used freely, but credit should be given to these Proceedings.

All papers were reviewed by members of the scientific committee.