国上清文1大些 Fundamental Law of Gearing Angular velocity ratio between the two arms are inversely proportional to their radii to the pitch point. wl Circles drawn through point P from each center are called the pitch circles C2 and the radius of each circle is called the pitch radius. N2 02N2 0,P 0N1 OP w2 O2 圈上泽夫道大学 Fundamental Law of Gearing Law of gearing: if the line drawn perpendicular to the surfaces of two rotating bodies at their point of contact always crosses the centerline between the two bodies at the same place,the angular velocity ratio of the two bodies will be constant. i2=const N2 It is important for gears to have a constant velocity/ ratio,otherwise,they would suffer from severe vibration, impact and noise problems. 1616  Angular velocity ratio between the two arms are inversely proportional to their radii to the pitch point.  Circles drawn through point P from each center are called the pitch circles（节 圆） and the radius of each circle is called the pitch radius. O2 O1 N2 N1 C1 C2 P K w2 w1 O P O P O N O N i 1 2 1 1 2 2 2 1 12      Fundamental Law of Gearing  Law of gearing: if the line drawn perpendicular to the surfaces of two rotating bodies at their point of contact always crosses the centerline between the two bodies at the same place, the angular velocity ratio of the two bodies will be constant. O2 O1 N2 N1 C1 C2 P K w2 w1  It is important for gears to have a constant velocity ratio, otherwise, they would suffer from severe vibration, impact and noise problems. Fundamental Law of Gearing i12  const