The car jack has an extremely compact appearance, which can lift a few tons of weight with simple operation without relying on any external force, completely relying on manual labor. This has always puzzled many people. So what gives the jack such powerful ability, is it just human labor? Let Guanhang unravel this mystery for everyone.

It is obviously unscientific to rely solely on human power to provide strong power output to car mounted jacks, and the root cause of all of this mainly comes from the interaction forces between machinery. Car mounted jacks are mostly shear type jacks. So today, we will mainly take you to understand the power transmission mode of shear type jacks.

A scissor jack belongs to a type of screw jack, which is driven by gears to rotate the screw and amplify the applied force by multiple factors. It utilizes the meshing of screws and nuts to transmit power and motion through mechanical transmission, mainly used to convert rotational motion into linear motion, and then convert torque into thrust, thereby achieving a labor-saving effect.

This is the entire process of spiral transmission, and the reason why the compact car jack has such tremendous energy is precisely due to the combination of human output and spiral transmission.