The introduction of the automatic transmission did this by offering a “no-muss, no-fuss” form of shifting. The earliest automobiles offered only manual transmissions, which were similar in principle to today’s stick-shift vehicles. These cars sported two forward gears and one reverse, coupled to the engine via a series of pedals. But as cars grew larger and traffic got worse, engineers began searching for a way to have the car “automatically” shift from one gear to another. Designers spent decades perfecting the modern automatic transmission. Here we offer a brief introduction and overview of the history of the automatic transmission.

2. Information and History of Products:
The introduction of the automatic transmission did this by
offering a “no-muss, no-fuss” form of shifting.
The earliest automobiles offered only manual transmissions,
which were similar in principle to today’s stick-shift vehicles.
These cars sported two forward gears and one reverse,
coupled to the engine via a series of pedals.
But as cars grew larger and traffic got worse, engineers began
searching for a way to have the car “automatically” shift from
one gear to another.
Designers spent decades perfecting the modern automatic
transmission.
Here we offer a brief introduction and overview of the history
of the automatic transmission.

3. The First Automatic Transmissions
The first automatic transmission was invented in 1921 by a
Canadian steam engineer, Alfred Horner Munro.
Munro designed his device to use compressed air rather
than hydraulic fluid so it lacked power and never became
sold commercially.
General Motors then developed the first automatic
transmission using hydraulic fluid in the 1930’s, and
introduced the “Hydra-Matic” transmission in 1940.
The 1948 Oldsmobile was the first model to use a true
automatic transmission.
The Hydra-Matic went through continual upgrading and
refinements through 1955, but the basic design and theory
used were consistent throughout its remarkably long life
span.
General Motors replaced the Hydra-Matic in 1956 with the
Jetaway.

4. The Hydra-Matic Transmission
The original Hydra-Matic transmission was one of the most
important innovations in the history of the automobile.
It wasn’t the first automatic transmission, but it was the first
one that really worked and its resounding commercial
success paved the way for every subsequent autoshifter.

5. Specification of Product:

7. Detail components of product

9. Manufacturing processes:
A shift lever is composed of a
lower lever section connected to
a control rod of a transmission,
and an upper lever section
formed with a hollow cylindrical
portion and provided with a
shift lever knob.
The lower lever section is formed
with an elongate end portion
which is being inserted in the
hollow cylindrical portion of the
upper lever section.

10. Blanking process the rolling of a
straight trapezoidal bar of steel
into a coiled form.
slitting the entire coil at a point to
separate each steel loop of the coil
which in the form of ring but silt at
point.
Blanking:
Machining:
The machining processes
involved is turning.
Basically the turning operation
on a ring is done in two steps.
In the first step & the internal
diameter is turned to specific
size and surface finish.

11. The term hobbing is refer to the
process of cutting the outer
diameter of the machining ring
into the shape of gear teeth by a
specially designed cutting tool
is called the hob cutter.
Hobbing:
In the process the loose chips of the metal which may have stuck
of the ring are removed and the gear are washed using antirust
oil.
Punching of the batch code and the supplier code is a lose done
after this process.
Debarring & washing punching:
Induction hardening:
This is the operation of raising the surface hardness of the gear
teeth up to a specific level and the depth of the hardness.

12. Compositions of materials:
Gears: Steel Grades-20MnCr5, SAE 8620, SAE 1045 etc
Shafts: Steel Grade-EN8D
Shifter Forks: EN8D,Polymer, Investment Casting
Rails: Bright Bars-EN1A
Transmission Casing: Grey or S.G. Iron Casting
To manufacture these Pig Iron, Coke & CRCA scrap & alloying
elements are used as Raw Materials.
High carbon steel such as 45C8, 50C4, 55C8 which are stronger,
tougher and respond to heat treatment are, therefore used for
gears.
In application like gears, the surface is heavily stressed, while the
stresses in the core are comparatively small magnitude. So that is
achieved by case hardening of gears.
Also nowadays in automotive sector, gears are designed for heavy
duty application and are thus made from alloy steels such as
16Mn5Cr4, 30Ni16Cr5 etc.

13. Applications:
A gear shifter is a metal lever
attached to the shift assembly in
a manual transmission-equipped
automobile and is used to change
gears.
In an automatic transmission
equipped vehicle, a similar device
is known as a gear selector.
Automatic transmission vehicles, semi-automatic transmissions,
and those with continuously variable transmission gearboxes do
not require a clutch pedal.
A gear stick will normally be used to change gear whilst depressing
the clutch pedal with the left foot to disengage the engine from
the drive train and wheels.
Thank You