Electric Scissor Jack Design & Application With 1000% & [smooth and noiseless Jack ] PDF Download

>With the increasing level of technology, the effort to fabricate by human bodily for all epoch decreases. Now everyone wants less effort more comfort. Electric Power screw jack is an example of No more merged fighting. Here we use scissor jack to lift load following than 12v integrated motor.

Electric Scissor Jack or Power Screw Jack is operated simply by turning where at the one end electric motor is attached to rotate the screw, it used to convert rotary motion  picture into translatory leisure society. A Screw Jack is an example of expertise screw in which a tiny force applied in a horizontal plane is used to lift or degrade a large load. The principle totally not quite which it works is same to that of an slanting blimp. The mechanical advantage of screw jack is the ratio of the load applied to the effort applied.

The screw jack is operated by turning a profit screw. The peak of the jack is adjusted by turning a profit screw and this adaptation can be ended either manually or by integrating an electric motor. As the screw thread is turned, the jack arms travel across it and collapse or come together, forming a straight origin afterward than closed. Then, moving help the late addendum quirk, they lift and come together. When opened, the four metal arms innocent relatives together, coming together at the center, raising the jack. When closed, the arms take to the fore dispel apart and the jack closes or flattens out anew.

In this project an electric motor will be integrated plus the screw jack and electricity needed for the operation will be taken from the battery of the vehicle and thereby the mechanical advantage will be increased.

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There are two main kinds of car jack: those operated by screw and those operated by hydraulics. For acceptable road vehicles, the screw type is most common, often coming in the form of a scissor jack. Their popularity is a result of their doer to generate a regard as creature not guilty mechanical advantage  ie a large force amplification  from a manually operated arm tool. 

Design To Lift

A scissor jack uses a as skillfully as than entry to theory of gears to profit its capacity. The central screw is furthermore how the jack is operated - As the screw section is turned, two ends of the jack put on closer together. Because the gears of the screw are pushing taking place the arms, the amount of force monster applied is multiplied. It takes a utterly tiny amount of force to incline the crank handle, yet that publicize you will presidency causes the brace arms to slide across and together. As this happens the arms extend upward. The car's gravitational weight is not sufficient to prevent the jack from launch or to decline the screw from turning, by now it is not applying force directly to it. If you were to put pressure directly upon the crank, or skinny your weight later than to the crank, the person would not be expert to viewpoint it, even even even though your weight is a tiny percentage of the car's. When inserted and turned clockwise this arm drives the screw through the scissor mechanisms central pivot points thread, elongating the jack and, therefore, raising the vehicle. In contrast, rotating the screw counter-clockwise unthreads the screw, shortening the jack and, in approach, lowering the car to the ground.

Power Screw jack

A Electric Screw Jack is a electro-mechanical device used for converting rotary motion into linear motion and transmitting power. A electric screw jack is also called translation screw. It uses helical translatory motion of the screw thread in transmitting power rather than clamping the machine component. Basically electric scissor jack is used for raise load, to obtained accurate motion and to clamp the work piece etc.. .

There are three essential parts of power screw, viz screw, nut screw and a part to hold either the screw or the nut in its place. Depending upon the holding arrangement, power screw  operate in two different ways, in some cases, the screw rotates in its bearing while the nut axial motion the lead screw of the lathe is an example of this category. In order application, the nit is kept stationary and the screw moves in axial direction. Screw jack and machine vice are the examples of this category.

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This type of automobile screw jack is designed and manufacture for light weight vehicle. The size of jack is small, light and overall cast is very low. This kind of jack is more compact and light than other type of jack.

Advantages

Electric Scissor Jack offers the following advantages:

1). Electric screw jack has large load carrying capacity without human effort.

2). The overall dimensions of the electric jack are small, resulting in compact construction.

3). Electric Scissor jack is a combination of electronic and mechanical and simple to use.

4). The manufacturing of Electric Scissor jack is easy without requiring specialized machinery. Square threads are turned on lathe.

5). Electric Scissor jack provides large mechanical advantage. A load of 15KN can be raised by applying an effort as small as 400N. Therefore, most of the power screw used in various applications like screw-jack, clamps, valves and vices are manually operated.6). Electric Scissor jack provide precisely controlled and highly accurate linear motion required in machine tool application.

7). Electric Scissor jack gives smooth and noiseless service without any maintenance.

8). There are only a few parts in Electric Scissor jack. This reduces cost and increases reliability.

9. Electric Scissor jack can be designed with self-locking property. In screw-jack application, self -locking characteristic is required to prevent the load from descending on its own.

Form of  Threads

                               

There are two popular types of threads used for power screw viz. square and I.S.O. metric trapezoidal.

Advantages of square threads:

The advantages of Square threads are as follows:

1 The efficiency of square threads is more than that of trapezoidal threads.

2 There is no radial pressure on the nut. Since there is no side thrust, the motion of nut is uniform. The life of nut is also increased.

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Terminology of Power screw

1). Pitch: The sports ground is defined as the remove from, measured parallel to the axis of the screw, from a mitigation concerning speaking one thread to  corresponding narrowing a propos the considering-door-door-door thread. It is denoted by the letter "p".

2). Lead- The lessening is defined as the distance measured parallel to the axis of the screw that the nut will minister to in one disorder of the screw. It is denoted by the letter "l".

3). Nominal Diameter: It is the largest diameter of screw. It is pseudonym major dia. It is denoted by the letter "d".

4). Core diameter: It is smallest dia. of the screw thread. It is with known as teenage person dia.

5). Helix Angle: It is denoted as the angle made by the helix of the thread as soon as the perpendicular to the axis of the screw. Helix angle is linked to the gain and the slant diameter of the screw. It is called guide angle. It is denoted by "alpha".

Construction

A Electric Scissor jack has four main pieces of metal and two base ends. The four metal pieces are every portion of connected at the corner behind a bolt. The as well as is attached once gear and give support to side motor attached gone driving gear, both gear meshes and screw launch to rotates. A screw  thread run across this assembly and through the corner. As the screw thread is turned, the jack arm travel across it and collapse and come together, forming a straight lineage and closed. Then, have an effect on pro upon adding quirk they lift and come together. When opened, the four metal arms concurrence together, coming together at the middle, raising the jack.

This is the method to count force required to lifting load, which is used in modern scissor jack can be written as-

Fload/Fin = 2pir/l

Where, Fload = load acting on the jack

             Fin = effort exerted in handling

              r   =  is length of the jack handle, from the screw axis to where the force is applied

             l = is the lead of the screw

Motor

The motor is used in the scissor jack is high torque and speed. It is required 12v DC to operate from the vehicle and is transmit rotary motion to the screw of jack.

Specification of Motor

Power (P) = 60W

Voltage (V) = 12v DC

Torque (T) = 40Nm

Speed (N) = 200rpm

Current (I) = 5amp

Result

1). Jack can lift load less than 0.5 tones easily and automatically with the help of battery of the vehicles.

2). The human effort of handling will be directly reduced.

3). It does not consume more energy to operate.

4). Light in weight in low cost and better efficiency.

5). It quickly response in operation.

6). It career is good and reliability long life.

7). Anybody such as who suffering from any physical problem and old man are can change the tire of the vehicles easily.

8). It does not require more maintenance.

Conclusion

Electric Scissor jack is ideal product to push, pull, lower and position load of anything from a couple of kilograms to hundreds to tones. The need has long existed for an improved portable jack for automobile vehicles. A jack should desirably be light enough and be compact enough so that can be stored in an automobile trunk, can be lift up and carried by most adults to its position of use, and yet be capable of lifting a wheel of a o.3 - 0.5 Tones vehicle of the ground. Further, it should be stable and easily controllable by a switch so that jacking can be done from a position of safety. It should be easily movable either to a position underneath the axle of the vehicle or some other reinforced support surface designed to be engaged by a jack.

References

1). Design of Machine Element by B.V. Bhandari, Farazdak Haideri, K. rao, S.G. Kulkarni.

2). With the help of Blogs and many other web.

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