P=节距是在带轮或同步带中心节线上测得相邻两个齿的距离
Pitch is the distance measured from the central line between tow adjacent teech of pulleys and timing pulleys
Dp=带轮的节圆直径
pitch circle diameter of belt of belt pulley
De=带轮实际外圆直径
External diameter of pulley
带轮外径计算方式：ZxP/π-2R=De 即齿数×节距/π-节差线=外径

T形齿同步带-轮
    T TOOTHED SYNCHRONOUS BELT-PULLEYS
    带轮选型图
    DESIGN HORSEPOWER (HORSEPOWER SERVICE FACTOR)

梯形齿同步带●轮
LADDER-SHAPED TOOTH SYNCHRONOUS BELT●PULLERYS
同步带选型图
DESIGN HORSEPOWER （HORSEPOWER SERVICE FACTOR）


圆弧形齿同步带●轮/ARC TOOTHED SYNCHRONOUS BELT ● PULLERYS
同步带选型图/DESIGN HORSEPOWER （HORSEPOWER SERVICE FACTOR）