Zhang Siying,Xu Mingxian.Research on bearing roller modification curve design based on multi-arc fitting[J].Journal of Mechanical Transmission,XXXX,XX(XX):1-7.
Zhang Siying,Xu Mingxian.Research on bearing roller modification curve design based on multi-arc fitting[J].Journal of Mechanical Transmission,XXXX,XX(XX):1-7.DOI:
Research on bearing roller modification curve design based on multi-arc fitting
To satisfy the design requirements for the crowned profile of cylindrical roller bearings
a design method based on multi-circular-arc fitting of the ideal logarithmic curve was proposed.
Methods
2
Firstly
taking the minimum sum of squared deviations between two circular arcs and the ideal logarithmic curve as the optimization objective
the Newton iteration method was adopted to perform unconstrained optimization of structural parameters. Secondly
a transitional tangent arc was arranged between the two arcs. With the minimum sum of squared deviations between the tangent arc and the ideal logarithmic curve set as the objective
penalty functions were introduced according to the constraint that two tangent points fall within the effective length of the roller to convert constrained optimization into unconstrained optimization
and the greedy algorithm was used to optimize parameters of the transitional tangent arc. Finally
fitting verification was carried out on rollers with three different dimensions
and thecontact stress was calculated using finite-length line contact algorithm.
Results
2
The results indicate that the fitted curve obtained by the proposed method achieves high approximation to the ideal logarithmic curve with continuous function values at arc intersection points. The contact stress distribution of loaded rollers is close to the ideal condition. Although slight stress jumps occur at intersections due to discontinuous curvature
the maximum contact stress still appears near the roller midsection
which verifies the validity of the presented design method.
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