The issue with the pulley groove angle
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Recently, a C-type pulley drive was designed, with the larger pulley having a diameter of Φ500 and the smaller pulley a diameter of Φ200. According to standards, the groove angles of the two pulleys are 38 degrees and 34 degrees respectively, while the wedge angle of the belt is 40 degrees. I wonder what the purpose behind such standard specifications is
The purpose is to increase the friction between the V-belt and the pulley, thereby reducing slippage. Because during operation, the belt stretches and deforms. .
There is a significant difference in diameter between large and small pulleys, and the cross-sectional deformation of V-belts varies depending on the bending radius. To ensure that the belt and the pulley are in a basically identical condition of engagement, friction is increased to reduce slippage.