The working principle of the trailer jack

Trailer's Jacks are divided into mechanical jacks and hydraulic jacks, with different principles. In principle, the most basic principle of hydraulic transmission is Pascal's law, that is, the pressure everywhere is the same. In this way, in a balanced system, the pressure applied on the smaller piston is relatively small, and the pressure applied on the larger piston is also relatively large, which can keep the liquid stationary. Therefore, through the transmission of liquid, different pressures on different ends can be obtained, and a transformation purpose can be achieved. The common hydraulic jack uses this principle to transfer force. The screw jack pulls the handle back and forth, pulls out the claw, that is, it pushes the ratchet clearance to rotate, and the small bevel gear drives the large bevel gear to rotate the weight lifting screw, so that the lifting sleeve can be lifted or lowered to achieve the function of lifting tension, but it is not as simple as the hydraulic jack