About the Book
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 78. Chapters: Gear, Transmission, List of gear nomenclature, Derailleur gears, Bicycle gearing, Gear ratio, Hub gear, Epicyclic gearing, Worm drive, Hobbing, Non-synchronous transmission, Wheel train, Backlash, Harmonic drive, Bevel gear, Bicycle drivetrain systems, Rohloff Speedhub, Spiral bevel gear, Gear oil, Helix angle, Gashing, Gear cutting, Non-circular gear, Cycloidal drive, Involute gear, Duplex worm, Shimano Alfine, Dynamic simulation, Rack and pinion, Herringbone gear, Sun and planet gear, Profile angle, Cremaillere, Sprocket, Tooth Interior Fatigue Fracture, Retro-Direct, Shimano Nexus, Sachs Elan, Cycloid gear, Gear shaping, Ravigneaux planetary gearset, Starter ring gear, Lead, American Gear Manufacturers Association, Pressure angle, Rotafix, Segmented spindle, Quench press, Gear manufacturing, SRAM i-Motion, Spur gear corrected tooth, Karbonite gears, Gear train, Gear shaper. Excerpt: A gear or more correctly a "gear wheel" is a rotating machine part having cut teeth, or cogs, which mesh with another toothed part in order to transmit torque. Two or more gears working in tandem are called a transmission and can produce a mechanical advantage through a gear ratio and thus may be considered a simple machine. Geared devices can change the speed, torque, and direction of a power source. The most common situation is for a gear to mesh with another gear, however a gear can also mesh a non-rotating toothed part, called a rack, thereby producing translation instead of rotation. The gears in a transmission are analogous to the wheels in a pulley. An advantage of gears is that the teeth of a gear prevent slipping. When two gears of unequal number of teeth are combined a mechanical advantage is produced, with both the rotational speeds and the torques of the two gears differing in a simple relationship. In transmissions which ...
