Gearing Flashcards
Types of gearing
Speed reducers and open gearing
Define gearing
Transmits power between 2 or more parallel shafts by means of successively engaging gear teeth
Gear with more teeth (and larger) is the
Gear
Gear with less teeth (and smaller) is the
Pinion
Define gear ratio
Is the ratio of the larger gear to the smaller gear
Open gearing types
Spur gears, helical gears, bevel gears, worm gears, and rack and pinion gears
What is the most common gear
Spur gear
Spur gear purpose
Transmit power between 2 parallel shafts, no axial thrust loads, slower speeds, noisy, easy to assemble, and high strength
Helical gear purpose
Capable of carrying more load than a spur gear, quieter and smoother running than a spur gear, faster, higher cost, and can create thrust loads
Internal gear purpose
Generally a spur gear, allows for a compact design, and used in planetary gearboxes
Internal gears my be what type of element?
Geroller
Worm gear purpose
Good for shock loads, compact design, high ratios, 90 degree operation, durable, and poor efficiencies
Rack and Pinion gear purpose
Automation equipment and are not very common
Speed reducer/gearbox purpose
Used to reduce motor speed and increase torque, smaller package, less guards and bearings, Hp, speed , torque relationship, and hollow shaft C-face adapter
Types of speed reducers/gearboxes
Worm, helical, and bevel
Worm gear reducers purpose
Large gear reductions (100:1), perpendicular shafts (RT angle), not efficient, durable, compact, multiple gear reductions available
What does centerline distance mean?
The distance between the 2 shafts centers
Helical gear purpose
Very efficient (up to 99% for single reduction) and lower operation cost
Types of gearbox mounting
Base mount, shaft mount, and gearmotor mount
T of F use oil to lubricate gears
True
Lubrication concerns for gears
Leveling, concern for open gearing, seals, and ambient temps/operating temps
What issues does elevation pose for gearing?
Safety and gearboxes heat up quicker at higher elevations
