Abstract
This paper shows a performance analysis for conical type sealless cylinders and rod bearings. The pistons withoutseal have partly cylindrical and conical shapes. 2 dimensional Reynolds equation and FD (finite differential) numericaltechniques are utilized for the performance analysis. The relationship among self-centering forces and leakage flows areinvestigated. Also, optimal design values for a sealless cylinder are presented. A prototype of sealless cylinder whichhad rod bearing with four pockets, five pockets, and six pockets was manufactured respectively. Leakage flow test isconducted to evaluate performance of piston and rod bearing in sealless cylinder.
