4947415
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Mind Map by sarahrojas12, updated more than 1 year ago
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Created by sarahrojas12
almost 9 years ago
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Differential.
- What is a differential?
- In automobiles and other wheeled
vehicles, the differential allows the
outer drive wheel to rotate faster
than the inner drive wheel during a
turn
- A differential is a particular type of simple
planetary gear train that has the property that
the angular velocity of its carrier is the average
of the angular velocities of its sun and annular
gears.. In automobiles and other wheeled
vehicles, the differential allows the outer drive
wheel to rotate faster than the inner drive
wheel during a turn
- This is necessary when the vehicle turns, making
the wheel that is traveling around the outside of
the turning curve roll farther and faster than the
other. The average of the rotational speed of the
two driving wheels equals the input rotational
speed of the drive shaft. An increase in the speed
of one wheel is balanced by a decrease in the
speed of the other.
- In automobiles and other wheeled
vehicles, the differential allows the
outer drive wheel to rotate faster
than the inner drive wheel during a
turn
- Application to vehicles
- A vehicle with two drive wheels has the problem that when it
turns a uhuy corner the drive wheels must rotate at different
speeds to maintain traction. The automotive differential is
designed to drive a pair of wheels while allowing them to
rotate at diferent speeds. In vehicles without a differential,
such as karts, both driving wheels are forced to rotate at the
same speed, usually on a common axle driven by a simple
chain-drive mechanism.
- A vehicle with two drive wheels has the problem that when it
turns a uhuy corner the drive wheels must rotate at different
speeds to maintain traction. The automotive differential is
designed to drive a pair of wheels while allowing them to
rotate at diferent speeds. In vehicles without a differential,
such as karts, both driving wheels are forced to rotate at the
same speed, usually on a common axle driven by a simple
chain-drive mechanism.
- Who invented it?
- There are many claims to the
invention of the differential gear.
Some historical milestones of the
differential include:
- 30 BC–20 BC:
Differential gear
systems possibly used
in China
- 658, 666 AD: two Chinese
Buddhist monks and
engineers create
south-pointing chariots for
Emperor Tenji of Japan.
- 1810: Rudolph Ackermann
of Germany invents a
four-wheel steering
system for carriages,
which some later writers
mistakenly report as a
differential
- 1832: Richard
Roberts of England
patents 'gear of
compensation', a
differential for road
locomotives.
- 1958: Vernon Gleasman
patents the Torsen
dual-drive differential, a
type of limited slip
differential that relies
solely on the action of
gearing instead of a
combination of clutches
and gears.
- 1720: Joseph Williamson
uses a differential gear in
a clock.
- 30 BC–20 BC:
Differential gear
systems possibly used
in China
- There are many claims to the
invention of the differential gear.
Some historical milestones of the
differential include:
- Epicyclic differential
- An epicyclic differential can use epicyclic gearing to split and apportion
torque asymmetrically between the front and rear axles. Epicyclic
gears are also called planetary gears because the axes of the planet
gears revolve around the common axis of the sun and ring gears that
they mesh with and roll between.
- An epicyclic differential can use epicyclic gearing to split and apportion
torque asymmetrically between the front and rear axles. Epicyclic
gears are also called planetary gears because the axes of the planet
gears revolve around the common axis of the sun and ring gears that
they mesh with and roll between.
- Spur-gear differential
- This is another type of differential that was used in some early
automobiles, more recently the Oldsmobile Toronado, as well as
other non-automotive applications. It consists of spur gears only.
A spur-gear differential has two equal-sized spur gears, one for
each half-shaft, with a space between them. Instead of the Bevel
gear, also known as a miter gear, assembly (the "spider") at the
centre of the differential, there is a rotating carrier on the same
axis as the two shafts.
- This is another type of differential that was used in some early
automobiles, more recently the Oldsmobile Toronado, as well as
other non-automotive applications. It consists of spur gears only.
A spur-gear differential has two equal-sized spur gears, one for
each half-shaft, with a space between them. Instead of the Bevel
gear, also known as a miter gear, assembly (the "spider") at the
centre of the differential, there is a rotating carrier on the same
axis as the two shafts.
- Non-automotive applications
- The earliest definitely verified use of a
differential was in a clock made by Joseph
Williamson in 1720. It employed a
differential to add the Equation of Time to
local mean time, as determined by the
clock mechanism, to produce solar time,
which would have been the same as the
reading of a sundial.
- The earliest definitely verified use of a
differential was in a clock made by Joseph
Williamson in 1720. It employed a
differential to add the Equation of Time to
local mean time, as determined by the
clock mechanism, to produce solar time,
which would have been the same as the
reading of a sundial.
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