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Chain Drives

Chain Drives. Advantages of Chain Drives Do not slip Maintain constant and precise speed. Good service life Easy to install and repair Disadvantages of Chain Drives Noisy Need lubrication Weight of the chain. Chain Drives. Types of Chains Roller Chains

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Chain Drives

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  1. Chain Drives • Advantages of Chain Drives • Do not slip • Maintain constant and precise speed. • Good service life • Easy to install and repair • Disadvantages of Chain Drives • Noisy • Need lubrication • Weight of the chain

  2. Chain Drives • Types of Chains • Roller Chains • Rotate on the teeth of a sprocket • Roller less Chains • No roller links • Used on lifts and hoists • Silent Chains • Sometimes called inverted tooth chain • Used at speeds and loads higher than roller chains • Sprocket, teeth different shape, grove in the middle

  3. Chain Drives • Chain Parts

  4. Chain Drives • Chain Designation • 1st number – Pitch (distance between 2 adjacent rollers). • Expressed in 1/8 inch. (8/8 is a 1 inch pitch) • 2nd number the type of chain • 0 – standard roller chain • 1 – light duty chain • 5 – roller less chain • Chain number followed by H – heavy duty chain • Number at end – multiple strand chain, number of strands. (Ex. 3 strand) • No. 60H-3

  5. Chain Drives • Sprockets • Device used to transmit power • Alignment critical • 3 types of misalignment (Horizontal, Vertical, Parallel) • Chain Tensioning • Only enough to prevent chain from coming off the sprockets • Slack – sag • Acceptable sag • Vertical chain – 2% • Horizontal – 4% • Center to center distance between sprockets

  6. Chain Drives • Sprocket Idlers • Take up slack • Reduce vibration

  7. Chain Drives • Speed, Torque and Sprocket Ratios • N(2)/N(1) = n(1)/n(2) = T(2)/T(1) • N(1) = number of the teeth of the driving sprocket • N(2) = number of teeth of the driven sprocket • n(1) = speed of the driving sprocket • n(2) = speed of the driven sprocket • T(1) = torque at the driving sprocket • T(2) = torque on the driven sprocket

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