Presentation 1
Presentation 1
Presentation 1
SUBMITTED TO
PRESENTED BY-
DIVYANSH SINGH
SISODIA
Requirement of
Transmission System
To provide for disconnecting the engine from
the
driving wheels.
When engine is running , connect the driving
wheels to engine smoothly without shock.
Leverage between engine and driving wheels to
be varied.
Enable the driving wheels to rotate at different
speeds.
Provide relative movement between engine
and
Gears
Spur
Rack and pinion
Internal
Helical
Herringbone
Bevel
Miter
Worm
A Very Simple Transmission
To understand the basic idea behind a standard
transmission, the diagram below shows a very
simple two-speed transmission in neutral:
First Gear
The picture below shows how, when shifted into
first gear, the collar engages the blue gear on the
right:
The five-speed manual transmission is fairly
standard on cars today. Internally, it looks
something like this:
Using Gears to Increase
Torque
and
Gear
Driving Ratio
gear smaller than driven gear
Output speed decreases
Output torque increases
Gear radius
Distance from center of a gear to its
outside edge
Gear ratio
Number of teeth on driven gear divided by
number of teeth on driving gear
Parts of a Transmission
System
Power flows from clutch disc to input shaft
Each forward gear has a synchronizer
Keeps two meshing gears from clashing
Shift linkage acts on shift forks within
transmission to select gear range
Power flows from input shaft to countergear
Then to mainshaft or output shaft
Parts are housed in transmission case
Has drain and fill plugs for adding and
draining oil
Types of Transmission
System
How Manual
Transmission Works
When a driver wants to change from one gear to
another in a standard stick-shift car, he first
presses down the clutch pedal.
This operates a single clutch, which
disconnects the engine from the gearbox
and interrupts power flow to the transmission.
Then the driver uses the stick shift to select a
new gear, a process that involves moving a
toothed collar from one gear wheel to another
gear wheel of a different size.
Devices called synchronizers match the gears
before they are engaged to prevent grinding.
Once the new gear is engaged, the driver
releases the clutch pedal, which re-connects
Function of clutch
Clutch is used to disengage and engage
the engine with rest of the transmission
systems.