Probability of Load-Carrying Ability of Two-Profile Chain Drives

The analysis of the available calculation methods of chain-drives load-carrying ability is given according to the criterion of the tolerance unit pressure in a single profile chain joint [p]₀. It is shown, that the values of [p]₀ were determined according to the deterministic ideas without consideration of the distribution law of both random varieties of contact step of inner and outer rings and lengths of drive strands of the first and second profile of the chain drive.

Probability task of determination of the tolerance unit pressure in two profile chain joints [p₀]_q is solved, when the structural, technological and physical-mechanical characteristic of the chain, that is, the lengths of drive strand of a chain-drive, accuracy of contact steps and stiffness of a drive roller chain are considered.

The measurement procedure and the empirical dependencies for determination of drive roller chains deformation and stiffness are presented.

As a result, the dependencies for the determination of [p₀]_q as the basic criterion according to which selection of a chain dimension-type, as well as characteristics used for the comparative estimation of a drive chain quality of different manufacturers when certain probability estimations are taken into consideration, were obtained.