【The owner's family car knowledge】A car will be equipped with many commonly used on-board tools as standard. Among them, the jack is a more important tool. Today we will explain the use of several common jacks equipped with a family car.
● The role of jacks
Generally speaking, jacks are used when replacing tires and initial checking the condition of the vehicle chassis.
● Types of jacks
It can be divided into rack jacks, screw (mechanical) jacks, hydraulic (hydraulic) jacks and pneumatic jacks (pneumatic).
★ Rack jack
This is the most common form of jack in family cars. Human power drives the rack to lift heavy objects through levers and gears. This type of jack has two shapes, one is "herringbone" and the other is "diamond".
advantage:Light weight, small size when folded, easy to store.
shortcoming:The support is not very strong, and the weight of the support is limited. Generally, it is only used for family cars of more than 1 ton.
★ Screw jack
The screw jack supports the heavy objects by the self-locking effect of the thread.
advantage:This kind of jack has a simple structure, reliable service life and relatively large bearing weight.
shortcoming:However, this type of jack generally has a relatively heavy weight, a relatively low transmission efficiency, and a slow lift.
★ Hydraulic jack
This type of jack that uses oil pressure to lift is more time-saving and labor-saving to use. The principle is to manually press the oil in the oil storage cavity into the oil cylinder through a one-way valve to lift heavy objects.
advantage:The lifting and lowering speed is very fast, and the maximum load-bearing capacity is generally very large, about 3 tons.You can see it in most auto repair shops
shortcoming:However, the volume of this type of jack is much larger than the above two types of jacks, and it is inconvenient to carry, so basically it will not appear in the toolbox of the family car, and can only be purchased separately if necessary.
No matter what kind of jack, owners and friends must remember their rated maximum support weight. Generally speaking, the maximum support weight of jacks for family cars is 700-1500 kg; the maximum support weight of jacks for off-road vehicles is generally 1500-3000 Kilogram.
★ Inflatable jack
There is also an unusual type of professional jack-inflatable jack. It uses the exhaust gas of the vehicle to inflate the air bag. Generally, the maximum supporting weight of this type of jack is about 4 tons. It is suitable for rescue under difficult conditions or self-rescue and relief of off-road vehicles. It is sold in domestic auto parts stores. The price is around 500 yuan.
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