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图1所示的开口式皮带轮传动中,两皮带轮的包角α、β值按下式计算:式中:D──大皮带轮的直径;d──小皮带轮的直径;α──小皮带轮的包角;β──大皮带轮的包角;A──中心距。利用图2的图表可以很快地确定皮带轮的包角值。例如:大皮带轮直径为100厘米,小皮带轮直径为50厘米,两皮带轮中心距250厘米时,将D-d=50厘米和A=250厦米的两点连线交于斜线即可求出:α=168°30′;β=191°30′。所求得的包角值应保证α≥150°,否则应增加A或减少D-d值或者采用张紧轮装置。若D-d和A的单位均改为毫米,图2同样可用。对于图3所示的交叉式皮带传动,也
In the open pulley drive shown in FIG. 1, the wrap angle α and β values of the two pulleys are calculated as follows: where D is the diameter of the large pulley, d is the diameter of the small pulley, α is the diameter of the small pulley Angle; β ─ ─ large pulley angle; A ─ ─ center distance. Use the chart in Figure 2 to quickly determine the wrap angle values for the pulleys. For example: a large pulley diameter of 100 cm, a small pulley diameter of 50 cm, the distance between the two pulleys 250 cm, the Dd = 50 cm and A = 250 Xiamen meters of the two-point connection to the slash can be obtained: α = 168 ° 30 ’; β = 191 ° 30’. The value of wrap angle obtained should ensure that α≥150 °, otherwise, A should be increased or D-value should be reduced or the tension wheel device should be used. If D-d and A units are changed to millimeters, Figure 2 is also available. For the cross-belt drive shown in Figure 3, too