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Machine-building Technologies
ArticleName Calculation of the maximum functional clearance of a cylindrical joint between a steel shaft and a cast iron sprocket
DOI 10.17580/cisisr.2024.01.17
ArticleAuthor O. A. Leonov, N. Zh. Shkaruba, Yu. G. Vergazova

Russian State Agrarian University – Moscow Timiryazev Agricultural Academy (Moscow, Russia)

O. A. Leonov, Dr. Eng., Prof., e-mail:
N. Zh. Shkaruba, Dr. Eng., Prof., e-mail:
Yu. G. Vergazova, Cand. Eng., Associate Prof., e-mail:


Cylindrical joints are widely used in mechanical engineering, where cast iron (sprockets of chain gears, gears, pulleys, etc.) act as the material for making holes, and steel is used for shafts. As a rule, these joints work in the conditions of dry and boundary friction and, in some cases, they have a key. The analysis showed that the wear of such joints occurred mainly due to the discrepancy between the accuracy standards, which, along with the strength standards, determine the durability and reliability of the joints. And if the strength standards are laid down by the designer, then the accuracy standards are usually assigned by analogy, based on the previous experience of using such constructions, with the use of software, when designer inserts standard deviations of shaft and hole as well as fit in electronic drawings. The main factors determining the margin of safety are such characteristics of the material as the maximal stresses on the cut, crumpling, bending, twisting, etc. To determine the margin of accuracy, it is necessary to set such parameters as the largest functional clearance or interference. Currently, there is no method for calculating the maximum functional clearance for joints with boundary or dry friction. The authors obtained dependence for determining the maximal functional clearance by the criterion of exceeding the allowable normal pressure on the contacting surfaces. An example of calculating the accuracy parameters for connecting a shaft made of steel with a malleable cast iron sprocket is considered, for which the maximal functional clearance is determined and fits are assigned – the first of the preferred series, and the second according to the criterion of reducing the cost of finishing processing of the components.

keywords Accuracy, tolerance, fit, fit tolerance, allowable normal pressure, largest functional clearance, smallest functional clearance

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Full content Calculation of the maximum functional clearance of a cylindrical joint between a steel shaft and a cast iron sprocket