Principe de fonctionnement et précautions du cric hydraulique

Sep 27, 2024

How vérin hydraulique works?
1. Components: A typical hydraulic jack consists of a pump, a cylinder, a piston, and hydraulic fluid.

2. Pumping Action: When you operate the jack’s handle, it drives a small piston inside the pump, which forces hydraulic fluid into a larger cylinder.

3. Pressure Transmission: As the fluid is pumped into the larger cylinder, it creates pressure. Because of Pascal’s Law, this pressure is transmitted equally throughout the fluid.

4. Lifting the Load: The pressure exerted on the larger piston is greater than the pressure on the smaller piston (due to the difference in area). This allows the jack to lift heavy loads with relatively little effort.

5. Lowering the Load: To lower the load, a release valve is opened, allowing the fluid to flow back into the reservoir, which reduces the pressure and causes the load to descend slowly.
Will a vérin hydraulique work upside down?
A hydraulic jack generally won’t work effectively upside down because the hydraulic fluid needs to be in the correct orientation for the pump and cylinder to function properly. When inverted, air can enter the system, preventing it from building the necessary pressure to lift a load.
Where to put vérin hydraulique under car?
You should place a hydraulic jack under the vehicle’s designated lifting points, which are typically outlined in the owner’s manual. These points are usually reinforced areas on the frame or underbody designed to handle the load safely. Always ensure the car is on a flat surface and engage the parking brake before lifting.