Design and Technology wise - a sight with sketches would be nice
2006-12-06 03:03:33 · 6 answers · asked by Anonymous in Education & Reference ➔ Homework Help
I guy knocks on your window with his gun and says get the hell out of the car if you want to live! You get out. He gets in and drives away. You've just been carjacked.
Seriouisly, the owners manual of your vehicle should have the instructions you seek. If you don't have the manual, try finding it on the carmakers web site.
2006-12-06 03:07:47 · answer #1 · answered by Forward Kindness 3 · 1⤊ 0⤋
There are several different kinds of car jacks. The very basic Jack like the one which comes with most cars works like a large screw or more appropriately a rack and pinion gear. But if you take it apart the shaft (the part that lifts up the car) will have what looks like the threads on a screw on it. The pinion gear (were you stick your jack handle) Also looks like a threaded screw but it a lot smaller than the shaft gear. When you stick your handle in and start turning it your are turning the small gear which in turn turns the large gear but at a slower rate. The small gear is mated to the larger gear (the shaft) which causes the larger gear to in turn also turn and because the gear is like a large screw by turning the smaller gear you are in effect screwing the shaft out raising the car.
Because the small gear is so much smaller than the large gear you have a torque multiplying effect which simply means that because of the gear ratios the amount of power you are using i.e. (how much you are straining) is multiplied to where you can lift the car with the jack.
The other type of jack that does with cars is called the scissor jack. There you can actually see the screw turning. On each end is a special nut which is threaded inside where the screw goes through them. as you turn the crank you screw the two nuts closer together which causes the lever arms to raise lifting the car.
You might want to go to an automotive store and get the parts man to show you a scissor jack and show you how it works. Watching it is worth a thousand pictures.
There is another type of jack used mainly by shops. It is the hydruilic jack. It uses hydruilic pressure to raise the car. It is comprised of a hydruilic cylinder and manual hydruilic pump. When you are pumping up and down on the handle you are working the pump pumping hydruilic fluid into the cylinder chamber the more fluid you pump in the higher the jack will lift the car.
2006-12-06 11:45:47 · answer #2 · answered by JUAN FRAN$$$ 7 · 0⤊ 0⤋
The mechanical ones work like a workshop vice (vise if you are from the US), only they spread apart, rather than clamping together. Like a vice, the screw action generates considerable force from the relatively small effort you put in.
The hydraulic ones operate rather like a bike tyre pump, but with oil, rather than air. The tyre pump has a small diameter, so you can pump in a bit of air at a time with little effort, to generate a great pressure in the tyre. With a hydraulic jack, you pump a bit of oil at a time from a little piston in a narrow cylinder into a wide cylinder with a big piston in it. If the area of the top of the big piston is 100 square centimetres, and the area of the little one is only 1 square centimetre, and you apply (say) 10kg of push to the little piston, the push given by the big one will be 100 times bigger - 1,000kg, or 1 tonne - enough to lift the car.
2006-12-06 21:03:06 · answer #3 · answered by andrew f 4 · 0⤊ 0⤋
They work like any other basic hydraulic works. Here's a site that explains how hydraulics work.
http://science.howstuffworks.com/hydraulic1.htm
2006-12-06 11:09:51 · answer #4 · answered by hsupilot08 3 · 1⤊ 0⤋
He doesn't work...that's why he's jacking cars...duh!
2006-12-06 11:05:13 · answer #5 · answered by fly_girl_pc12 2 · 0⤊ 0⤋
Hope this helps.
2006-12-06 11:09:39 · answer #6 · answered by Melo379 2 · 1⤊ 0⤋