The composition of the chain drive
1—The driving sprocket 2—the chain 3—the driven sprocket 2. The working principle relies on the meshing force between the chain 2 and the two sprockets to make the driven sprocket 1 rotate, thereby realizing the transmission of motion and (or) power. 3. Features: 1) Advantages: ①Accurate average transmission ratio, no sliding ②Compact structure, small pressure Q on the shaft ③High transmission efficiency η=98% ④High bearing capacity P=100KW ⑤Can transmit long-distance transmission amax=5～ 6m, can be used in occasions with high temperature and harsh environment ⑥Low cost. 2) Disadvantages: ① The instantaneous transmission ratio is not constant
②The transmission is not stable ③There is noise and impact during transmission , bicycles, etc.Medium and low speed transmission: transmission ratio ≤ 4, P ≤ 8KW, V ≤ 100-12m/s, the maximum linear speed of silent chain can reach 15m/s (not suitable for impact and rapid reverse, etc.) 40. Chain drive transmission ratio set In a chain drive, the number of teeth of the driving sprocket is z5, and the number of teeth of the driven sprocket is z1. Each time the driving sprocket rotates one tooth, the chain moves one link, and the driven sprocket is driven by the chain to rotate one tooth.When the rotational speed of the driving sprocket is nl and the rotational speed of the driven sprocket is n2, the number of teeth zlnl rotated by the driving sprocket per unit time is equal to the number of teeth z2n2 rotated by the driven sprocket, that is, z2n1=z1n2 or n2/n1=z2 /z1
The transmission ratio of the chain drive: i= n1/n2 =z2/z1 The above formula explains: the transmission ratio of the chain drive is the ratio of the speed of the driving sprocket nl to the speed of the driven sprocket n2, which is also equal to the number of two sprockets z1 and z2 inverse ratio.