Most hydraulic auto lift work on a hydraulic system. Hydraulics is a pressure system that requires pressure to go into one chamber and transferring it to another. Most car lifts for garages need hydraulic car lift installation for smooth operation.
A hydraulic lift automotive system operates using the same basic concept as any hydraulic system: when you apply force to a liquid in one place, the pressure is transmitted through the system to exert an effect somewhere else.
Hydraulic auto lifts use hydraulic fluid (a petroleum oil with additives), which cannot be compressed no matter how much pressure you exert on it. Instead, the fluid flows through the hydraulic system and moves a cylinder that raises the car off the ground.
Some hydraulic car lifts use an air compressor, while others use an electric motor. Regardless the power source utilized, the basic idea is the same. The lift exerts force on the hydraulic fluid, which in turn moves a cylinder to raise the car. Trading force for distance is a common idea in mechanical systems. In the case of a hydraulic auto lift , this means connecting a narrow cylinder to a wide one via hydraulic lines. Oil compressed through the narrow cylinder travels a great distance. When that force is transferred into the wide cylinder, it moves a shorter distance, but with much greater force.
The same theory is used to operate the brakes on your car: when you press down on the brake pedal, the force is transferred through the fluid in the brake lines to the master cylinder, which transmits force equally to the calipers at all four wheels. Because the brake fluid cannot be compressed, you can push down harder on the pedal to exert more pressure on the brakes.
Source: e-how dot com.
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