Types of car jacks and precautions for use
Car jacks are indispensable equipment in the process of car repairs, and are generally used to jack up the body when replacing spare tires. The types of automobile jacks are pneumatic jacks, electric jacks, hydraulic jacks and mechanical jacks, and hydraulic and mechanical jacks are commonly used. Car jacks are mostly used to replace spare tires. If the tire is broken when driving out, it can be easily replaced.
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　　 Types of car jacks
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A type of automobile jack: a rack jack; it is composed of a rack, a gear, and a handle . It relies on shaking the handle to make the rack rise and fall; this is also a type of automobile jack commonly seen in ordinary cars. It is not bulky and is easy to store. But it is also because of this, limiting its supporting weight can not be too large.
Two types of automobile jacks: hydraulic jacks; hydraulic jacks are divided into general hydraulic jacks and special hydraulic jacks. Its working principle is more complicated, so I won't go into details here. The advantage of its use is that it has a fast lifting speed and a greater load-bearing capacity than the rack jack. But likewise, such a powerful jack is definitely not easy to carry, so this is not a common type of car jack.
Three types of automobile jacks: screw jacks; screw jacks rely on self-locking threads to support heavy objects, the structure is not complicated, but its support weight is large. However, the working efficiency of this screw jack is slow, rising slowly and falling fast.
Four types of car jacks: Inflatable jacks; this kind of jack may feel a bit strange when you see it, because this type of car jack is not common. It relies on the exhaust of the car to inflate it, so the conditions of use are relatively special and little known.
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　　 Note on the use of car jacks
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1. When the vehicle is jacked up, the engine must never be started, because the vibration of the engine or the rotation of the wheels will cause the vehicle to slide off the jack and cause danger.
2. In order to ensure the safety of various types of cars, jacks generally have a fixed position when they are used. Jacks cannot be used to support bumpers, beams and other parts.
3. Maintenance personnel must not work under unsupported vehicles. When changing wheels, passengers cannot stay on the vehicle because their movement may cause the vehicle to slip off the jack.
4. If there is no jack when changing tires, different emergency measures can be taken according to the different positions of the tires.
5. When disassembling the outer tires of the two wheels, the inner wheels of the car can be parked on wooden blocks or stones with appropriate heights, and the outer tires can be replaced in the air. Pay attention to tighten the hand brake and plug the front wheels.
6. When disassembling the front tires or rear inner tires, use stone or brick to stabilize the front axle and rear axle pads of the car, dig pits under the tires to be removed, and make the tires hangable for replacement.
The above is about the types of car jacks and precautions for use. When using a jack to lift the vehicle, the engine of the car must never be started, because the vibration of the engine or the rotation of the wheels will make the vehicle slide down from the jack and there is a danger. Jacks are generally used in fixed positions. Jacks cannot be used to support bumpers or beams.
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