單元: Week 21-23: LO 4 Understand power transmissions, principles of operation and failure patterns of GEAR DRIVES | EAL Level 3 QET3/029 Maintenance of mechanical systems 23-24 | Grŵp NPTC Group Moodle

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Week 21-23: LO 4 Understand power transmissions, principles of operation and failure patterns of GEAR DRIVES

  • Week 21-23: LO 4 Understand power transmissions, principles of operation and failure patterns of GEAR DRIVES

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    29.4 Understand power transmissions, principles of operation and failure patterns of 

    GEAR DRIVES

    Lesson Objectives

    • To discover the principles of operation: tooth profiles, cross-sectional shape, number of teeth, generation of the involute form, the geometry of gears, pressure angles, terms of circular gear geometry, backlash, diametrical pitch and speed relationship between two mating gears
    • To identify the Types and arrangements of gears: bevel gears, plain, spiral, hypoid, helical, spur, worm
    • To explore the maintenance requirements of gears: alignment, lubrication and condition
    • To examine the operating symptoms: noise, overheating and vibration
    • To recognise the symptoms of gear failure: corrosion, link seizure, wear and galling
    • To determine the causes of failure: out of alignment, out of parallel, out of plane and contamination
    • To look at the lubrication of gears: moisture, out of mesh and overload




    • Here is very useful information on all you need to know for gear drives that covers the criteria for the unit.

    • Here is a PowerPoint on an introduction to gears and the engineering formulas associated with them

    • Here is a gear ratio worked example number 1
    • Here is a gear ratio worked example number 2
    • Please complete examples 1 to 6
    • Please complete the Compound Gears Worksheet.