Abstract
Abstract This article contains the results of experimental tests of vibrations of a continuously variable transmission (CVT) belt transmission driven by a two-stroke internal combustion engine. The measurements were made with the use of a high-speed camera, which allowed to obtain results impossible to obtain with other measurement methods. The nonlinear integro-partial differential equation of vibrations of the moving belt is given. Based on a simplified linear equation, the observed effects on the amplitude–frequency characteristics obtained from the measurements are explained. An approximate formula is given that allows for determining the transmission belt velocities for which resonances occur.
Highlights
Modern vehicles are more and more often equipped with stepless gearboxes, which unlike traditional transmissions, allow for much better utilization of the internal combustion engine power characteristics
The program does not require the previous implementation of markers defining base points. This is especially important in the case of continuously variable transmission (CVT) belt vibration measurements because the transmission specificity does not allow for marking the markers on the side V-belt surface
The engine is near the peak of the drive torque characteristic, which directly refers to the maximum longitudinal force in the tight belt side
Summary
Modern vehicles are more and more often equipped with stepless gearboxes, which unlike traditional transmissions, allow for much better utilization of the internal combustion engine power characteristics These mechanisms, called continuously variable transmissions (CVTs), enable for obtaining any gear ratio within a specified range. Only a simple mechanical centrifugal regulator is used, and the advanced way needs the application of the additional device of electromechanical or hydraulic type This includes disadvantages like cost and large powertrain complication because of the lack of space in transmission housing. This study presents the research methodology and the measurements results of the belt transverse vibrations with the use of a high-speed camera. In addition to presenting the experimental data, this article gives a theoretical approach to observed phenomena based on a model of the Rayleigh moving beam. The obtained results may be useful in selecting the operating conditions of the CVT transmission, ensuring its maximum efficiency
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