Decreasing of sliding friction in hydraulic piston damper

Decreasing of sliding friction in hydraulic piston damper

Stať ve sborníku v databázi WoS či Scopus

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 increasing of F-v dependence of the whole system. 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 contributes to the increasing 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 with different preload from materials NOVATHAN and NBR 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.

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 increasing of F-v dependence of the whole system. 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 contributes to the increasing 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 with different preload from materials NOVATHAN and NBR 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.

hydraulic piston damper, hydraulic damper, piston rod seal

hydraulic piston damper, hydraulic damper, piston rod seal

KUBÍK, M.; MAZŮREK, I.; ROUPEC, J.

2016

14.05.2015

Prague

978-80-86246-42-0

Engineering mechanics 2015

NEUVEDENO

170

171

2