Abstract
The relevance of the scientific and practical task of forming criteria and objective functions in the rational design of two-shaft gearboxes is described. This has made it possible to understand the need to highlight the topic and conduct relevant research and scientific discussions on the issue. The most significant mass and dimensional characteristics of two-shaft gearboxes from the perspective of vehicle design have been identified and used as criteria for optimal and rational design. Specifically: the center distance, which determines the placement of the gearbox shafts and its height; the length of the gearbox, which determines one of the main overall dimensions of the gearbox; the weight of the gearbox, the reduction of which may be dictated by the requirements for the technical object and also leads to a reduction in the material used and energy consumption; and the probability of reliable operation. Objective functions corresponding to the criteria of optimal and rational design are formulated, which are expressed by functional dependencies between geometric-constructive parameters and mass-dimensional characteristics, and also take into account the strength aspects of the main elements of two-shaft gearboxes. The objective function of the minimum center distance allows reducing the sum of the center distances of all gear meshes of the gearbox, and considering the condition of equality of the center distances of the gearbox gear meshes among themselves, to preserve the structural features and arrangement of the gear meshes. The objective function of minimum length accurately characterizes the linear dimension (length) of the gearbox. It considers not only the widths of the gear teeth but also other indicators (clearances, bearings, synchronizers, etc.), which are significant additions and increase the accuracy of calculations. The objective function of minimum weight of the gearbox consists of the weights of its main elements, namely: gears, shafts, bearings, synchronizers, and housing with the shifting mechanism. These elements make the main contribution to the mass characteristic, and the weights of other parts will be neglected due to their small sizes and inclusion in the error, which may be permissible for estimation calculations. The objective function of maximum reliability probability is presented as a certain «integral» value, which contains all calculated coefficients of stress levels for bending and contact stresses. Also design variables are defined
Published Version
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