National University of Science and Technology—NUST MISIS, Moscow, Russia:

Mnatsakanyan V. U., Professor, Doctor of Engineering Sciences, artvik@bk.ru
Surina N. V., Associate Professor, Candidate of Engineering Sciences
Belyankina O. V., Associate Professor, Candidate of Engineering Sciences
Sizova E. I., Associate Professor, Candidate of Engineering Sciences

The article actualizes the issues of linkage precision in joints in hydraulic cylinders of powered roof supports at the stages of their design, manufacture and repair. The influence of the structural clearances on the position deviations of piston shaft under the action of external forces is shown. The linkage precision parameters for the joints being discussed are substantiated, and the methods to achieve these parameters in hydraulic props during their manufacture, assembly and repair are proposed. Based on the study of the effect exerted by the clearances in the cylinder–piston and bottom box–shaft joints on the position deviations of the shaft and on the level of the contact stresses initiated, the contact conditions of the mating parts are identified to minimize the stresses. The recommendations are developed to ensure the required sizes of clearances in the joints. For this purpose, such methods of precise linkage precision as selective assembly, assembly by the method of intergroup interchangeability and the method of adjustment using a piston as an immobile equalizer are considered. The main technological conditions for the applicability of selective assembly are established in terms of a hydraulic cylinder–piston connection with a diameter of 110H9/f9 in the serial production conditions. The calculated results and the ways to reduce the excess stock as a consequence and a main disadvantage of the selective assembly are presented.

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