engleski

Design features and analytical calculation of a continuous variable transmission

With the development of CVT (Continuously Variable Transmission) technology, transmissions are regularly used in industrial plants. At the end of the 20th century, CVT transmissions were increasingly used in agricultural machinery, off- road vehicles, snowmobiles and cars. Nowadays, as more and more attention are paid to environmental awareness, i.e. pollution, the use of CVT transmissions in cars is a normal phenomenon. Continuously variable transmissions are suitable for applications where precise control of the gear ratio or output speed and torque is required and where the power flow in the transmission must not be interrupted. Due to their design, i.e. the operating principle, these transmissions are suitable for automatic control of the transmission ratio with prior knowledge of the characteristics of the input and output sides. The aim of this research is to analyse the existing performance of gearbox structures and to show the efficiency of the design and parts of the analytical calculation for the chosen design. The chosen design solution for the analytical calculation and design elaboration is a continuously variable belt transmission with manual adjustment of the transmission ratio. The design of the machine system for changing the transmission ratio is presented in detail. The SolidWorks 2021 software package is used for the design, while the data from the available catalogues of standard elements are used for the analytical calculations. The principle of operation of the change of transmission ratio, belt CVT transmission, is based on the axial movement of the two halves of the conical pulleys or the change of the distance between them. The change of the transmission ratio is achieved by means of a lever, which achieves the given axial displacement of the two halves of the pulleys through a connection of machine elements. The result of this work was to show the way to calculate the CVT transmission and to present the construction process of the same.

Design features ; Analytical calculation ; Continuous variable transmission ; Belt transmission ; Developing

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