SCREW JACK

2. CONTENTS
0 Introduction
0 Literature survey
0 working
0 proposed model
0 Force analysis
0 Test results
0 Cost estimation
0 Advantages
0 Application
0 Future scope
0 conclusion

3. INTRODUCTION
0 This device the “AUTOMATIC ELECTRO- MOTORISED JACK has been developed to
later the needs of small and medium automobile garages.
0 In most of the garages the vehicles are lifted by using screw jack. This needs high man power
and skilled labors. In order to avoid all such disadvantages, this “AUTOMATIC
ELECTRO- MOTORISED JACK has been designed in such a way that it can be used to
lift the vehicle very smoothly without any impact force. The operation is made be simple that
even any person can handled, by just pressing the button

4. 0 This project work titled AUTOMATIC ELECTRO-MOTORISED JACK has been
conceived having studied the difficulty in lifting the any type of light vehicles. Or loads our
survey in the regard in several automobile garages, revealed the facts that mostly some
difficult methods were adopted in lifting the vehicles for reconditioning.
0 Now the project has mainly concentrated on this difficulty, and hence a suitable electronic
control unit has been designed. Such that the vehicles can be lifted from the floor land
without application of any impact force. By pressing the button in the dashboard, the
electronic control unit activates the jack automatically. The fabrication part of it has been
considered with almost case for its simplicity and economy, such hat this can be
accommodated as one of the essential tools on automobile garages.

5. LITERATURE SURVEY
[1]Experimental Investigation of Motorized Screw Jack
Maniamramasamy.S1 , Kaviyarasu.P2 , Luke Justin Johnson.G
Over the recent decades maintenance in automobile engineering become a challenging task
among the engineers. Saving economy has become the task of highest priority in our
generation. Design modification of existing product allows the work as much as easier than the
previous model. In this work, design and fabrication of motorized screw jack is fabricated to
reduce the power consumptions and to decrease the human effort. Here the existing screw jack
is modified as motorized screw jack to increase the human comfort. The motorized power jack
can be widely used in low cost automation in manufacturing industries. The weight lifting is
quick and effortless, which reduces the physical fatigue (tiredness) felt by the worker.

6. 2]Modification of the Existing Design of a Car Jack
A. S. Akinwonmi and A. Mohamme
This paper analyzes the modification of the existing motor screw jack by incorporating an electric motor
in the screw in order to make load lifting easier. In this modified design, the power screw is rotated
through its connecting gear with the pinion gear when electrical power flows through the cigarette lighter
receptacle connected to the motor, plugged to the automobile 12 V battery source to generate power for
the prime mover (motor), which transmits its rotating speed to the pinion gear meshing with the bigger
gear connected to the power screw to be rotated with required speed reduction and increased torque to
drive the power screw. The significance and purpose of this work is to modify the existing car jack in
order to make the operation easier, safer and more reliable in order to reduce health risks especially back
ache problems associated with doing work in a bent or squatting position for a long period of time.

7. [3]Modeling of Optimal Screw Jack Design
1R.Senthilkumar, 2P.Ramesh, 3P.Velmurugan,
The aim of this paper is modelling of optimal screw jack design using VBA Programming in
AutoCAD package software. Today’s demand grows need of good design and quality product
with short span of time to achieve a better product. The software development in the digital
world is a vital role to satisfy a number of demands, in this regard author considers CAD
software to develop design of screw jack. The application software having the instruction as
per the developer but it not meets the user. When the user handles that software, they need a
long time span to complete a 3D modelling with complicated design. In AutoCAD, the
programming languages are embedded through macros to design our needs as programming
language.

8. METHODOLOGY:
0SEMESTER I
0-We started our work with literature survey.
0-Search many research papers from various articles and
published journal papers.
0-Worked on diff. Mechanisms that can be useful for our
project.
0-We have done a rough 2D sketch of model in Auto-
CAD,CATIA.
0-After getting rough model we started calculation of some
components.
0-We selected standard components.
0-Simultaneously we have done work of report for semester I.

9. METHODOLOGY:
0 SEMESTER II
0 Actual preparation of project:
0 -We will complete calculations of remaining parts.
0 -We will purchase standard components from market.
0 -We will be done a rough 3D model of our project.
0 - Manufacturing will be done.
0 -Assemble will be done.
0 -Testing of set up will be done.
0 -Representation of actual theoretical report.

10. PROPOSED MODEL

11. Forces in Scissor Jack members

12. DESCRIPTION
0 The motorized screw jack has been developed to cater to the needs of small and medium
automobile garages, which are normally man powered with minimum skilled labor.
0 In most of the garages the vehicles are lifted by using screw jack.
0 This needs high man power and skilled labor.
0 In order to avoid all such disadvantages, the motorized jack has been designed in such a way
that it can be used to lift the vehicle very smoothly without any impact force.
0 The operation is made simple so that even unskilled labor can use it with ease.

13. COMPONENTS OF THE SYSTEM
1. LIFTING ARMS
2. BASE AND UPPER PLATE
3. LEAD SCREW
4. MOTOR

14. LIFTING ARMS
0 AIMCO’s Articulated Lifting Arms are ideal for load manipulation in low headroom
environments. Lifting arms provide the ability to reach-in round, and under obstruction while
providing a safe and secure means of load handling.
0 End of arms Tooling for AIMCO’s articulated lifting arms range from simple lifting forks to
custom grippers with Mechanical or Vacuum Grabs. Parallel linkage is standard to assume the
payload and end of arm tooling retain the proper orientation throughout the lift and transfer
operation.

15. LEAD SCREW
0 A lead screw, also known as a power screw or translational screw, is a screw used as a linkage
in a machine, to translate turning motion into linear motion. Lead screws are an excellent
economical solution for your linear motion requirement.
0 Power screws are a common means of translating rotary motion into linear motion. There are
several different types, each of which has its own advantages and disadvantages depending
on the requirements of the application. Acme lead screws are defined by their thread profile,
which is trapezoidal with a thread angle of 29 degree.

16. Fig: lead screw

17. MOTOR
0Type – 12 volt geared DC motor
A DC motor is any of a class of electrical machines that converts direct current electrical power
into mechanical power. The most common types rely on the forces produced by magnetic fields.
Nearly all types of DC motors have some internal mechanism, either electromechanical or
electronic, to periodically change the direction of current flow in part of the motor. Most types
produce rotary motion; a linear motor directly produces force and motion in a straight line.

18. MOTOR USED IN OUR PROJECT
SPECIFICATIONS
Single phase ac motor
Voltage = 220 volts
Current = 0.36 ampere
Speed = 25 rpm
Power = 1/12 HP = 62.14 Watt (as 1 HP = 745.7 Watt)
Operating frequency = 50 Hz

19. Two way switch*1
2 way switching means having two or more switches in
different locations to control one lamp. They are wired so that
operation of either switch will control the light. This
arrangement is often found in stairways, with one switch
upstairs and one switch downstairs or in long hallways with a
switch at either end.
Fig. two way switch ( M1 clockwise and M2 anticlockwise
rotation)

20. CASE 1=FOR 12 VOLT DC MOTOR
Maximum Load to be lifted = 50 KILO
CASE 2 = FOR SINGLE PHASE AC MOTOR
Maximum Load to be lifted is Q ,
The effort force for a screw jack when taking friction can be expressed as,
F = (Q p) / (2 π R)
Where
F = effort force at the end of the arm due to motor ( N )
Q = weight or load (kg)=?
p = pitch distance or lead of thread in one turn (mm)= 2.5 mm
r = pitch radius of screw (mm)= 8 mm
R = lever-arm radius (mm) = 10 mm
n= speed of motor =25 rpm

21. F = (Q p) / (2 π R)
Q= F*2*3.142*0.008/0.0025
Q=3023.83/9.81 = 308.24kg
So theoretical maximum load can be lifted by our screw jack is 308.24 kg
To find F we have, Torque by motor = T
P = 2πn T/60 watt so T=P*60/(2*3.142*25) = 63*60/(2*3.142*25)
T= 24.06 Nm.
So torque is 24.06 Nm. Then force F is calculated as
F= T/radius of lead screw = 24.06/0.020 = 1203 N. force Then the maximum
lifting weight will be,

22. ADVANTAGES
1. The loaded light vehicles can be easily lifted.
2. Checking and cleaning are easy, because the main parts are screwed.
3. Handling is easy
4. No Manual power required.
5. Easy to Repair.
6. Replacement of parts are easy
7. Maximum height up to 1.5 feet can be reached.

23. APPLICATIONS
1. It is useful in auto-garages.
2. This motorized screw jack is used for lifting the vehicles. Thus it can be useful
for the following types of vehicles in future;
• Maruti, Ambassador, Fiat, MahindraIt is very much useful for Car Owners &
Auto-garages. This automatic electro-hydraulic jack is used for lifting the vehicles.

24. FUTURE SCOPE
0 It is very much useful for Car Owners & Auto-garages.
0 This automatic electro-hydraulic jack is used for lifting the vehicles.
0 All Fabrication and medium scale industries.

25. CONCLUSION
Screw Jacks are the ideal product to push, pull, lift, lower and position loads of anything from a couple of
kilograms to hundreds of tones.
The need has long existed for an improved portable jack for automotive vehicles. It is highly desirable that a
jack become available that can be operated alternatively from inside the vehicle or from a location of safety off
the road on which the vehicle is located.
Such a jack should desirably be light enough and be compact enough so that it can be stored in an automobile
trunk, can be lifted up and carried by most adults to its position of use, and yet be capable of lifting a wheel of
a 4,000-5,000 pound vehicle off the ground.
Further, it should be stable and easily controllable by a switch so that jacking can be done from a position of
safety.

26. REFERENCES
0 [1] T. li Yang, A. xin Liu, L.-Z. Ma, and L.-B. Hang, “Structure compositionprinciple of
reconfigurable mechanisms and basic methods for
changing topological structure,” in Reconfigurable Mechanisms and Robots, 2009. ReMAR 2009.
ASME/IFToMM International Conference
on, june 2009, pp. 104 –109.
0 [2] A. Castano, W.-M. Shen, and P. M. Will, “Conro: Towards deployable robots with inter-robots
metamorphic capabilities,” Auton. Robots,vol.
8, no. 3, pp. 309–324, 2000.
0 [3] Y. Meng, Y. Zhang, A. Sampath, Y. Jin, and B. Sendhoff, “Cross-ball:A new morphogenetic self-
reconfigurable modular robot,” in Robotics
and Automation (ICRA), 2011 IEEE International Conference on, May, pp. 267–272.

27. Thank you