V型带传动的传递功率损失 第Ⅱ部分:小带轮半径的影响(一)

Power Transmission Losses In V-Belt Drives Part 2:Effects of Small Pulley Radii(Ⅰ)

采用运转的缠绕、毛边和齿形的V型带传递51,36和21mm半径带轮间的功率。分开测量该带轮间的转矩和角速度损失表明它们分别近似与I/R和I/R2成比例,同时还大于根据现有理论的预测值。带轮半径由51减小至21mm时,最大有效拉力比由21降至5。根据转矩损失的简化分析出现一无因次带变形参量(gEI/R4)1/2,已经验求得与超出根据带拉长和径向屈服预测的转矩损失和速度损失两者有关。采用厚平带和圆柱带轮的辅助试验表明它的功率损失与相同截面积的V型带意外的接近,建议这些V型带损失归因于一般原始楔入带轮槽的情况,必须研究推测带体变斜或剪切变形说明小半径带轮与损失的关系。

Run-in AV10 wrapped, raw-edged and cogged V-belts have been used to transmit power between pulleys of equal radii R equal to 51, 36 and 21 ram. Separate measurements of the torque and angular speed losses between the pulleys have shown that these are approximately proportional to I/R and I/R2 respective- ly and are also greater than expected from current theories. The maximum useful belt tension ratio fell from 21 to 5 as R was reduced from 51 to 21 mm. A dimensionless belt deformation parameter （gEI/R4 ）1/2, arising from a simplified analysis of torque loss, has been found empirically to correlate with both torque loss and the speed loss in excess of that ex- pected from belt extension and radial compliance. Subsidiary tests with thick flat belts on cylindrical pulleys have shown their power losses to be unex- pectedly close to those of V-belts of similar cross-sectional area, suggesting that those V-belt losses usually attributed to wedging in the pulley groove are of more general origin. It is speculated that belt carcass war- ping or shearing distortions must be considered to explain losses on small-radii pulleys.