Designing a Car Jack - Best Type & Tips

In summary: Air+Jack&item=&product_id=5691&cat=38&subcat=In summary, the best car jack to design is the old ratchet style bumper jack, but avoid them if possible. An electric scissor jack would be the second best option.
  • #1
charlie
1
0
Designing a car jack?

I have been set a design project in which i am to design a car jack. i am really having trouble starting...so could anyone tell me which kind of car jack would be the best/easiest to deisgn (ie: scissor jack etc - but not a hydraulic one), and also what is the best way to start?

many thanks! :cool:
 
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  • #2
If this is for a physics/mech eng class - you probably want to look at:

How much weight do you have to lift?
Hint - this isn't the mass of the car, the car is acting like a lever pivoting on the wheels on the other side.

How much force can your user supply, and so what mechanical advantage do you need?

How far do you have to lift it?
 
  • #3
Welcome to PF, Charlie.
Mgb covered the main questions, but there are a couple of ancilliary ones. Is this just a single-purpose unit (ie: one model of car and one user), or is it to be more universal? For instance, you'd need a variable 'starting' height for different tire sizes and types of suspension. Also, a very high mechanical advantage would be needed if someone in poor health would have to use it.
Probably the easiest to design and build would be the old ratchet style bumper jack, but I strongly recommend against it. They don't offer a lot of advantage, and were never safe at the best of times.
If you definitely don't want to use hydraulics, which is best, something based upon a lead-screw would be second choice. The scissors type that you mentioned is very good.
Remember to design your top plate so that it can properly support the part of the car that you want to use as your lift point, be it a lower control arm or a frame rail or rear axle tube or whatever. There should be some sort of 'lips' on it so the load can't slip off even if it shifts a bit. Remember: Safety First.
Good luck with it.
 
  • #4
two of the most simple ''jacks''
are used in races, formula 1 uses a ''L'' shaped jack or a bent lever
no moving parts and one man powered by his weight

indy cars use onboard airjacks, plug in an compressed air line
and up pops the car, the jack is two tubes with one end sealed ,
the other end inside the other tube
 
  • #5


I have the same problem. I need to design a jack that lifts 10,000N of force, with a force applied by hand of 180N (turning the jack handle ) ... and I need to lift it by a height of 0.275m
where do I start ?
 
  • #6


By following the suggestions listed above. Don't take it as rude, but you won't learn anything if we tell you how to do it...
 
  • #7


You're right .. I have been working on it and I got stuck a bit at converting the turning moment of the screw... into the horizontal Force acting on the on the sides of the ''scissor jack'' which will then raise it.

I worked out the turning moment of the thread while turning to be 2036N
and set the thread pitch to 1cm but I don't know how to find the possible diameter of the thread if I do this, then I am hoping that I should be able to find the horizontal force
 

1. What are the different types of car jacks available?

There are several types of car jacks available, including scissor jacks, bottle jacks, floor jacks, and hydraulic jacks. Each type has its own advantages and disadvantages, so it is important to consider your specific needs before choosing the best type for you.

2. What is the weight capacity of a car jack?

The weight capacity of a car jack varies depending on the type and brand, but most jacks have a weight capacity of 2-3 tons. It is important to check the weight capacity of the jack before using it to ensure it is suitable for your vehicle.

3. What materials should be used for a car jack?

The most common materials used for car jacks are steel and aluminum. Steel is stronger and more durable, but also heavier. Aluminum is lighter and easier to transport, but may not be as strong as steel. It is important to choose a jack made from high-quality materials to ensure safety and longevity.

4. What are some safety tips for using a car jack?

When using a car jack, it is important to always read the instructions carefully and follow them closely. Make sure to place the jack on a flat, stable surface and use jack stands for added security. It is also important to never go under a vehicle supported only by a jack and to always use the jack for its intended purpose.

5. How do I maintain and store my car jack?

To ensure the longevity of your car jack, it is important to properly maintain and store it. This includes regularly checking for any wear or damage, cleaning and lubricating the moving parts, and storing it in a dry and secure place. It is also important to follow the manufacturer's instructions for maintenance and storage.

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