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Robotics Sensors and Actuators

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Module 6: Motion transmission

  1. Q8a. Describe Belt transmission: Component, application, advantage and disadvantage.20247m

    Module 6: Motion transmission

    Describe Belt transmission: Component, application, advantage and disadvantage.

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    Answer

    Belt Transmission

    Components: Driving pulley, driven pulley, belt (flat, V, timing) tensioned, idler.

    Working: Friction (or teeth for timing) transmits motion. Velocity ratio i=N1/N2=D2/D1i = N_1/N_2 = D_2/D_1.

    Advantages: Low cost, quiet, distance transmission, overload slip protects, damping.

    Disadvantages: Slip/creep, limited power, tension maintenance, temperature sensitive, not precise.

    Applications: Conveyor, robot wrist belt drive, 3D printer timing belt, fan.

    Final: Belt pulley friction/timing transmission i=D2/D1i=D_2/D_1, cheap quiet but slip.

  2. Q8b. Describe Gear transmission: Component, application, advantage and disadvantage.20247m

    Module 6: Motion transmission

    Describe Gear transmission: Component, application, advantage and disadvantage.

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    Worked Solution

    Answer

    Gear Transmission

    Components: Pinion and gear (spur, helical, bevel, worm) meshing teeth on pitch circles. Velocity ratio i=Z2/Z1i=Z_2/Z_1, torque T2=T1iηT_2=T_1 i \eta.

    Working: Teeth push, positive drive, no slip.

    Advantages: High power, precise ratio, compact, high efficiency (95%), long life.

    Disadvantages: Costly, noise, backlash, lubrication needed, fixed centers.

    Applications: Robot gearbox, differential, CNC, automotive.

    Final: Gear teeth positive drive i=Z2/Z1i=Z_2/Z_1, precise high power but noisy and backlash.

Previous moduleModule 5: Introduction to motors