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BevelPinion Gears

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Bevel/Pinion Gears. Worm Gear. Spur Gear. Planetary Gear. Let us assume that a driver pulley is attached to a motor. ... When the motor is switched on the ... – PowerPoint PPT presentation

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Title: BevelPinion Gears


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Bevel/Pinion Gears
Spur Gear
Worm Gear
Planetary Gear
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Let us assume that a driver pulley is attached to
a motor. When the motor is switched on the driver
pulley revolves at 20 rpm. The diameter of the
driver pulley wheel is 200mm and the driven
pulley wheel is 400mm. This means for every
single revolution of the larger driven pulley
wheel, the smaller driver pulley wheel rotates
twice. This is due to velocity ratio. The ratio
can be worked out mathematically in different
ways. The two most likely methods are shown below
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The pulley to the left is suspended and as a
consequence the mechanical advantage is
increased. This happens because the rope on the
left and right of the pulley are both lifting the
LOAD, they each lift half its weight. The load is
split into 2.
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A pulley system with the effort applied from
above is very difficult to use. The most
comfortable way to use a single moving pulley is
combine it with a fixed pulley, seen below. This
allows the effort to be applied
downwards. Please note, as one of the pulleys is
a fixed pulley the mechanical advantage and
velocity ratio is still calculated as if only the
moving pulley exists. The velocity ratio and the
mechanical advantage remains 2.
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CRANKS
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CRANKS
360 2?r 180 ?r 90 ½ ?r 45 ¼ ?r
Torque Force Radius (t f r) (Theta) T
(revolutions (2?r / 1rev) Work Torque x
Theta (w t x T)
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