Power Transmission IOE
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Transcript of Power Transmission IOE
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Sat a Nara an Shah
B.Sc. Mechanical Engineering (India)
MS in Manufacturing Engineering & Management (UK)
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The Beginning3
PedalDriver
Driver pushes on Pedal to move vehicle
He is more concern about smooth cruising i.e.. Best
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Where Does the Force Come From?
En ine roduces some tor ue at a s eed
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Power- the rate at which work is done:
( )( )VelocityForcePower=
Power is Tor ue times Rotational S eed rotar
VF=
( )( )= SpeedRotationalTorquePower
=
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Where Does the Force Come From?
Power is conserved:5
vehicleaxletransengine PPPP ===
POWER IS ABSOLUTE Torque is relative (depends on gear ratio)
Ignoring Losses, of Course
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WHAT IS POWERTRAIN MATCHING ?
Selectin the ri ht en ine and earin for a iven a lication
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Not just performance, but giving the driver the expectedresponse to pedal inputs
Transmission shift schedules as fuel economy heavily impacted
in automotive applications.
Torque & Power shaping can give optimal performance for
a given set of gearing
Optimal gearing can make your car faster for no changes in
engine performance
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DRIVE TRAIN8
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POWER TRAIN SYSTEM 1 Front driveshaft (2) Output transfer
gearbox
(3) Transmission
(4) Upper driveshaft
(5) Torque converterupdrive transfer gears
orque conver er
(7) Engine
(8) Front differential
(10) Centre bearing
(11) Centre driveshaft
(13) Rear differential
(14) Rear final drives
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Clutches
Connects /disconnects Engine
crankshaft to the transmission
(gear box)Change of gears can not be
smoot w en t e engine is irect y
connected with the transmission.ransm s e power o e roa
wheels smoothly
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Clutches Friction clutches are
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design to absorb energyduring slippage.
Virtually all vehicle
clutches are spring- . The torque transmission capacity of a
clutch can be estimated as,
where, Tc is the torque capacity, f is the
smcc nrfFT =
, c clutch, rm is the mean radius of the clutch,and ns is the number of friction surfaces.
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Clutch should
Consume minimum physical effort13
Be free from slipWearing surface should have long life
Be provided a suitable mechanism for damping of
vibration and elimination of noiseMain parts of clutch
Pressure plate:- It presses the driven plate against the
flywheel
Driven plate:- Is provided with annular facings and
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TypesofclutchThemostlyusedclutchisthefrictiontypeoffollowingtypes
Coneclutch:isonlyusedinthesynchromeshunitsofgearboxesandsometimesinepicyclical gearboxes
Single
plate
clutch:
Mostly
used
in
cars
and
trucksMultiplateclutch: Mostlyusedinmotorcycles,tractorsandmostl construction e ui ment. This t e of clutch is mostlusedwherehightorquetobetransmittedandlimitedspaceavailable
Centrifu alclutch
Freewheelclutchoronewayclutch
Bandtypeclutch
Electricalclutch
JumpClutch
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Advantages of fluid coupling
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transmission
imination o c utc p ate
Damping of the torsional vibration of thecrankshaft
During braking or down hill, the transmission
shocks are absorbed by the fluid
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Torque ConvertorTorque Convertor
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Tor ue ConvertorTor ue Convertor28
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Torque converter basic operation
Coupling stage:- Turbine is rotating at 90 % of the impeller33
spee
Fluid from the turbine strikes the convex side of the statorblade causing it to overrun
Coupling stage will be high when acceleration is not requiredand the equipment is cruising
At this oint the tor ue converter is actin like a fluid clutchThe impeller is rotating at engine speed, the turbine isstationary and the stator is locked against rotation
increasing vertex flowThe vertex flow strikes the turbine blades and diverted around
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Advantages of torque converter
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automatic transmission of the construction equipment
Smoothes out the transfer of engine torque to the
Acts as cushion between the engine and transmission
ampens v ra onsVirtually wear free
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Mechanical transmission
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e eng ne power s ransm e o e w ee s o
equipment through mechanical arrangements.
s ac eve y gear mec an sms n manua gear ox
Mostly this system is found in vehicles, trucks and light
Depending on the no. of gear for forward speeds and reversegear, power flows takes place in manual transmission system
ypes o gear oxe1. Sliding mesh type
2. Constant mesh type
3. Synchromesh type
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Mechanical transmission
Sliding mesh type:- is oldest and simplest, meshing of gears
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takes place by sliding of gears on each other. Consists of main
shaft, countershaft and idler gear shaft for reverse speedConstant mesh t e :- In this earbox all the ears mesh witheach other all the time. Gear changing is made easier byhelical gear. The primary shaft which carries the clutch is
s lined and carries a ear that mesh with ears on thelayshaft gear
Synchromesh gearbox:- Use synchromesh gear devices on the
equalizes their speed with readily and smoothly and thedevices used is synchronizer ring.
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The Planetary Gear combinations provide
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y p
as c operat ons Gear Reduction
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os t on- un gear s e ; ng gear - nput
Position-II Ring gear is held; Sun gear -input
Overdrive
Position-I Ring gear is held; Carrier-input
Position-II Sun gear is held; Carrier-input
Reverse
Position-I Carrier is held; Ring gear-input
Position-II Carrier is held; Sun gear-input
Direct Drive
Entire planetary unit works as single unit
At a time Two units input; one out put
Neutral
When no unit is held
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Powershift Transmissions
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Powershift Transmissions
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power.
and b) planetary.
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Fig. 12.10a Countershaft Powershift Transmission
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(Hi Lo Shift)69
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Hi Lo Powershift
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Hi Lo Powershift70
When neither clutch is engaged, transmission is in
neutral. When left clutch is engaged, output shaft turns
slower than input.
When right clutch is engaged, output shaft turns the
same speed as the input.
When both clutches are engaged, transmission is in
Park.
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Fig. 12.10b Countershaft Powershift Transmission
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(Reverser)71
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Reverser Powershift
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eve se owe s
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en neit er c utc is engage , transmission is
in neutral.,
opposite direction of the input.
turns the same direction as the input.
When both clutches are engaged, transmission
is in Park.
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meshing with the sun and the second meshing with
the ring gear.
May also include two sun and/or two ring gears.
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Hydrostatic transmission system
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Basic ower train of h drostatic s stem
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Actuator
ng nepump valve Travel
motor
Swing motorBasic ower flow in h drostatic drive s stemLike in hydraulic excavator
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