Chain Drives and Roller Chains
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Questions and Answers

Where is the smaller sheave typically mounted when the belt is used for speed reduction?

  • On the belt itself
  • On the driven machine
  • On a high-speed shaft (correct)
  • On the motor shaft
  • What is the side of the belt that experiences an increase in tension when transmitting power known as?

  • Slack side
  • Driving side
  • Loose side
  • Tight side (correct)
  • What causes the belt to grip the driving sheave when transmitting power?

  • Torsion
  • Expansion
  • Friction (correct)
  • Compression
  • Which type of belt is often made from leather or rubber-coated fabric?

    <p>Flat belt</p> Signup and view all the answers

    What is the larger sheave mounted on when using a belt for speed reduction?

    <p>Driven machine</p> Signup and view all the answers

    What provides exceptionally low friction between the chain and the sprockets in a roller chain?

    <p>The roller on each pin</p> Signup and view all the answers

    How is the pitch of a roller chain usually illustrated?

    <p>As the distance between the centers of adjacent pins</p> Signup and view all the answers

    What suffix is used to indicate heavy-duty sizes in roller chains?

    <p>H</p> Signup and view all the answers

    What does ISO-606 style of chain have basically the same design dimensions as?

    <p>U.S. standard roller chains</p> Signup and view all the answers

    In agricultural equipment, what systems employ many chain drives for actuation?

    <p>Tractor accessories</p> Signup and view all the answers

    What is the driving force in flat belts limited by?

    <p>Pure friction between the belt and the sheave</p> Signup and view all the answers

    Why are flat belts preferred for delicate machinery?

    <p>To prevent high torque levels that could damage the machine</p> Signup and view all the answers

    What is a characteristic of synchronous belts in terms of drive mechanism?

    <p>Positive drive limited by tensile strength and shear strength of teeth</p> Signup and view all the answers

    What contributes to the stress in a belt around sheaves?

    <p>Bending around sheaves, especially on the tight side</p> Signup and view all the answers

    What is the recommended minimum sheave diameter for standard belts?

    <p>Using smaller sheaves drastically reduces belt life</p> Signup and view all the answers

    What is the purpose of attachments in roller chains?

    <p>To facilitate connection to rods and buckets</p> Signup and view all the answers

    What are the three modes of failure considered when rating a chain's power transmission capacity?

    <p>Fatigue of link plates, impact of rollers, galling between pins and bushings</p> Signup and view all the answers

    What lubrication method is recommended for chain drives according to the text?

    <p>Petroleum-based lubricating oil</p> Signup and view all the answers

    What does the power capacity of a chain drive depend on?

    <p>The speed of the smaller sprocket and expected life</p> Signup and view all the answers

    How do multiple strands of chain affect the power capacity?

    <p>They have no impact on power capacity</p> Signup and view all the answers

    What is the primary difference between a 5V belt and a 5VX belt?

    <p>The smooth inner surface</p> Signup and view all the answers

    What is the recommended maximum reduction ratio for a plain V-belt drive?

    <p>6:1</p> Signup and view all the answers

    Why should the shafts carrying mating sheaves be parallel and the sheaves be in alignment?

    <p>To ensure smooth belt tracking</p> Signup and view all the answers

    What should the angle of wrap on the smaller sheave be according to the provided text?

    <p>Greater than 120°</p> Signup and view all the answers

    Why are matched belts required in multibelt installations?

    <p>To ensure smooth belt tracking</p> Signup and view all the answers

    Which lubrication method involves applying oil with a brush or a spout can at least once every 8 hours of operation?

    <p>Manual or drip lubrication</p> Signup and view all the answers

    Which lubrication method involves continuously dipping the chain into a sump of oil provided by the chain cover?

    <p>Bath or disc lubrication</p> Signup and view all the answers

    Which lubrication method involves an oil pump delivering a continuous stream of oil to the lower part of the chain?

    <p>Oil stream lubrication</p> Signup and view all the answers

    Which lubrication method does not require the chain to dip into the oil directly?

    <p>Bath or disc lubrication</p> Signup and view all the answers

    Which lubrication method involves feeding oil directly onto the link plates of each chain strand?

    <p>Manual or drip lubrication</p> Signup and view all the answers

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