Test #2 MMET 301 Study Guide.pdf - Chapter 3 Belt Drives Types of belts \u25cf V-belts \u25cf multi-rib belts \u25cf double-v \u25cf Flat belts \u25cf Synchronous

Test #2 MMET 301 Study Guide.pdf - Chapter 3 Belt Drives...

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Chapter 3: Belt Drives Types of belts: V-belts multi-rib belts double -v Flat belts Synchronous belts Rope belt Flat Belts (1800s and early 1900s) Disadvantage Relies on high tension inorder to keep the belt in firm contact with the pulley and a high friction force and a high friction force to keep it from slipping Advantages Flexible Can bend easily around small diameters Adaptable to serpentine and twisted drive Made in a variety of lengths and widths Can be endless or open-end Rpe belts(late 1800s) Fitted with v-shaped grooves for the ropes to ride in Allow for higher normal forces at lower belt tension Replaced by belt drives V-belts(1917) The belt was designed to wedge tightly into the sheave groove as tension was applied to the belt Higher torque values Higher drive speeds could be maintained with less slip “V” shape of the belt matches the “v” of the sheave grooves More contact area than round ropes Higher efficiency Theory Synchronous belts New concept in power transmission belt evolution Flat belt with evenly spaced, raised teeth that are perpendicular to the long axis of the belt The belt teeth are designed to mesh with complimentary teeth on a “pulley” or sprocket (similar to how a chain works) Combine the advantages of chains and gears and v-belt No slip, no stretch, no metal-to metal contact No lubrication required Designed to elimiante excessive heat build-up and operate efficiently Rely on positive engagement of belt teeth with complimentary teeth on a sprocket
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Deliver 100% of the intended rotational speed with 98% efficiency Types H-type Round tooth profile HTD S-type circular -arc gear tooth STPD Russian engineer Novikov Dominant design used today R-type Deep-profile parabolic Helical offset tooth Looks like a tractor tire tread
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