Where should the jack be placed when changing a car tire?
1 Answers
When changing a car tire, the jack should be placed under the chassis, near the wheel's raised point. Here is some relevant information about jacks: 1. Working principle of jacks: Jacks can be categorized into mechanical jacks and hydraulic jacks, each with different principles. The basic principle of hydraulic transmission is Pascal's Law, which states that the pressure in a liquid is uniform throughout. In a balanced system, a smaller force applied to a smaller piston results in a larger force on a bigger piston, maintaining the liquid's static state. Thus, through liquid transmission, different pressures can be obtained at different ends. The commonly seen hydraulic jack utilizes this principle to achieve force transmission. A screw jack operates by repeatedly moving the handle, which pushes the ratchet intermittently, with the small bevel gear driving the large bevel gear to rotate the lifting screw, thereby raising or lowering the lifting sleeve to achieve lifting force. However, it is not as simple as a hydraulic jack. 2. Classification of jacks: Based on structural features, jacks can be divided into rack jacks, screw jacks, and hydraulic (oil) jacks. Other types include separated jacks, horizontal jacks, claw jacks, synchronous jacks, oil hydraulic jacks, and electric jacks. Commonly used jacks include screw jacks, hydraulic jacks, and electric jacks.
