1. Clutch
A Clutch is a machine member used to
connect the driving shaft to a driven shaft, so that the driven shaft may be
started or stopped at will, without stopping the driving shaft. A clutch thus
provides an interruptible connection between two rotating shafts. Clutches
allow a high inertia load to be stated with a small power.
Clutches are used whenever the
ability to limit the transmission of power or motion needs to be controlled
either in amount or over time (e.g. electric screwdrivers limit how much torque
is transmitted through use of a clutch; clutches control whether automobiles
transmit engine power to the wheels).
2. Brake
2
A brake is a mechanical device which
inhibits motion. Its opposite component is a clutch. Brake pedal slows a car to
a stop. When you depress your brake pedal, your car transmits the force from
your foot to its brakes through a fluid. Since the actual brakes require a much
greater force than you could apply with your leg, your car must also multiply
the force of your foot.
Almost all wheeled vehicles
have a brake of some sort. Even baggage carts
and shopping carts may have them for use on a moving ramp.
Most fixed-wing aircraft are fitted with wheel brakes on the undercarriage.
Some aircraft also feature air brakes designed to reduce their speed in
flight. Friction brakes on automobiles
store braking heat in the drum brake
or disc brake
while braking then conduct it to the air gradually. When traveling downhill
some vehicles can use their engines to
brake.
No comments:
Post a Comment