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19 October 2016
PHASE 11
SORRY FOR WAITING NEW PHASE ...
3.2 PNEUMATIC COMPONENTS
The word ‘pneuma’ comes from Greek and means breather wind. The word
pneumatics is the study of air movement and its phenomena is derived from the
word pneuma. Today pneumatics is mainly understood to means the application of
air as a working medium in industry especially the driving and controlling of
machines and equipment.
Pneumatics
has for some considerable time between used for carrying out the simplest
mechanical tasks in more recent times has played a more important role in the
development of pneumatic technology for automation.
Pneumatic
systems operate on a supply of compressed air which must be made available in
sufficient quantity and at a pressure to suit the capacity of the system. When
the pneumatic system is being adopted for the first time, however it wills
indeed the necessary to deal with the question of compressed air supply.
18 June 2016
PHASE 10
iii. AUTOMATIC LOCKERS:
Transmit
power to each wheel through a pair of dog clutches. Differential action, such
as when cornering is provided by
automatically disengaging the appropriate clutch when one wheel rotates
faster than the other. This results in differential action which occurs in
ratcheting stages rather than being smooth and progressive. Power received by
the differential is automatically directed to the wheel with greater traction.
Therefore, if one wheel is lifted off the ground, the other wheel will receive
the total power applied to the differential to maintain vehicle mobility.
Traction is
far superior to conventional and limited slip differentials. While automatic
locking differential provide excellent performance off road, vehicle handling,
particularly on highway, is sacrificed. Unlocking during cornering can be
sudden, resulting in a rapid change of direction, particularly in short wheel
based vehicles. During sharp cornering an audible ratcheting sound usually
occurs as differential action takes place and a loud banging noise may be heard
when the unit locks up again.
16 June 2016
PHASE 9
3.1.2 THE FUNCTION OF A DIFFERENTIAL:
- To aim the engine power at the
wheels
- To act as the final gear reduction in the vehicle,
slowing the rotational speed of the transmission one final time before it
hits the wheels
- To transmit the power to the wheels while allowing them
to rotate at different speeds (This is the one that earned the
differential its name.)
3.1.3 TYPES OF DIFFERENTIALS
§ Conventional or Open
§ Limited Slip
§ Automatic Locking
§ Manual Locking
§ Limited Slip
§ Automatic Locking
§ Manual Locking
15 June 2016
PHASE 8
2.3.4 OVERALL BIAS CONTROL
The differential may be designed with
different bias ratios ranging from approximately '2.5:1' to '6:1' or higher.
This may be accomplished by varying the side gear helix angles, or by altering
the friction characteristics for the primary components. An increase in helix
angle increases the thrust component of the side gear meshes along the axis of
the side gears so that smaller portions of the loads communicated by the side
gear meshes are related to rotation of the side gears.
In addition, the higher thrust
component along the axis of the side gears increases frictional resistance at
the end faces of the side gears which opposes side gear rotation and thereby
further contributes to an increase in bias ratio.
14 June 2016
PHASE 7
2.3.3 STRUCTURE FOR ACHIEVING TORQUE
BIAS
As previously stated, the torque
biasing characteristic of this differential is achieved by interconnecting the
drive axles with an Index gearing configuration which selectively controls the
generation of frictional torques within the differential.
It is important to note that there
are no intrinsic forces or pre-loads within the differentials which affect
transfers of torque between drive axles. All of the forces which are controlled
to produce frictional resistance between drive axles are derived from transfers
of torque between a single drive source and the drive axles.
13 June 2016
PHASE 6
VARIOUS CLAIMS OF THE CONCEPT:
2.3.2 IN-VEX GEARING:
Index gearing in a this differential
includes a gear train arrangement comprised of two or more pairs of satellite
gears (called element gears') in mesh with central helical gears (called 'side
gears'). The pairs of element gears are interconnected with each other by means
of spur tooth engagement. This particular arrangement consists of six element gears
and two side gears. The number of element gear pairs used in a specific design
is a function of overall torque capacity and space requirements.
The modified crossed axis helical
gear mesh, element gear to side gear, is designed and processed to provide
instantaneous elliptical contact for reduced tooth stress and increased tooth
overlap engagement. In addition, gear tooth helix angle, pressure angle and
tooth depth proportions are selected to further minimise stress and wear
without sacrifice to function.
12 June 2016
PHASE 5
iv. EXCELLENT ON ROAD HANDLING
2WD on road handling is
the best available and a front fitment has no affect, even with the hubs locked
(exception : not suitable for C4WD).
Off road steering with a
front fitment is virtually unchanged - you may experience a slight tightening
of the steering wheel in some situations but is barely noticeable except where
the effects of tail shaft windup can occur on hard surfaces (as it does
without). This is because you are feeling the effects of both wheels driving
with 100% traction on the round. Depending on the terrain and driving style
there may be some element of under steer but it is minimal.
11 June 2016
PHASE 4
2.2.4 DYNAMIC LOCKING PRINCIPAL
1. Unlike other types of
Lockers the LOKKA has a locking and unlocking principal that is dynamic. The
more power that is applied the harder it locks so it doesn't need large bias
forces constantly operating on it to keep it locked, the bias spring forces are
minuscule and can be easily compressed with two fingers. This results in a
locker that is able to lock and unlock extremely easily even when driving on
some of the most slippery of surfaces. The locking mechanism is so sensitive
that a wheel can be disengaged with one finger when a wheel is jacked up off
the ground.
2. LOKKA's engineering
principal is based on two sets of opposing forces but simplified . . . there
are two forces acting on the internal gear sets
A. - one acting to unlock
the cam and axle gears by the gear tooth design and effects of the ground
driven forces acting on a wheel when cornering,
10 June 2016
PHASE 3
2.2 LOKKA DIFFERENTIAL UNIT DISCUSSION PAPER
LOKKA is a fully
automatic Differential Lock that does not require any manual operation. It does
not have switches, external lines, electric or pneumatic controls of any sort. It relies
on a simple but highly innovative mechanical design which makes use of two
distinct sets of forces - the "ground driven" forces acting on a
wheel when cornering (that force an outside wheel to turn faster) and the
forces from the engine (power) turning the diff. The combination of these two
sets of opposing forces and the unique design allow the automatic engagement
and disengagement of the driving gears when a vehicle turns or requires
differential action.
(FORM THE
JOURNAL- John. Markel and A. H. Gray, LOKKA electronic
differential concept the MITRE Corporation, Bedford, Massachusetts 01730, Vol. ASSP: 22, April 2007.
2.2.1 DIFFERENCE TO A NORMAL DIFFERENTIAL
09 June 2016
PHASE 2
1.3 FEASIBILITY STUDY
The objective of a feasibility study
is to test the technical, economic, behavioral and operational feasibility of
developing a new mechanism. This is done by investigating and generating ideas
about the same. The proposed project must be evaluated from technical
viewpoints first, and if technically feasible its impact on the environment
must be assessed. If compatible operational and technical aspects can be
devised, then they must be tested for economic feasibility.
1.3.1 TECHNICAL FEASIBILITY
The assessment of technical
feasibility must be based on an outline design of project requirements in terms
of the mechanism used and the drives and components used to execute the above
said mechanism. The components used should be correctly utilized and the drives
also should be exactly used to execute a technically feasible mechanism.
1.3.2 ECONOMIC FEASIBILITY
Economic
feasibility deals with the analysis of costs against benefits (i.e.) whether
the benefits to be enjoyed due to the new mechanism is worthy when compared
with the costs to be spent on the older mechanism. The cost is observed to be
cheaper when it is produced in a mass production than produced in a small
amount.05 June 2016
PHASE 1
AUTOMATIC
DIFFERENTIAL LOCKING SYSTEM
BACHELORS OF ENGINEERING
in
AUTOMOBILE ENGINEERING
ACKNOWLEDGEMENT
At this
pleasing moment of having successfully completed our project, we wish to convey
our sincere thanks and gratitude to the management of our college and our
beloved chairman M. V. Muthuramalingam who provided all the facilities to us.
We would like
to express our sincere thanks to our principal
, for forwarding us to do our
project and offering adequate duration in completing our project.
We are also
grateful to the Head of Department
Prof. Balasubramaniam for His constructive
suggestions & encouragement during our project.
With deep
sense of gratitude, we extend our earnest & sincere thanks to our guide, Mr. Frank Gladson, Department of
Mechanical engineering, for his kind guidance & encouragement during this
project.
02 June 2016
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15 February 2016
14 February 2016
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