When buying a car , the location where the vehicle trunk will lorry comes with some simple car maintenance tools, in addition to the common wrench and screwdriver , there is a "large " is the jack, jack configurations of different models are not the same species , then the specific what use is it ?

    Family cars Considering that space problem , usually comes with the jack will be placed in the trunk below , opened the trunk under the partition we can see it. Household jacks are usually relatively simple design , jack can be divided into rack jacks, mechanical jacks , hydraulic jacks and heavy gas jack several categories. Common chassis with replacement tires and viewing conditions will be used .

    Rack jacks : family cars , the most common type of tool , from a manpower driven by a lever and gear rack top heavy lifting , there are two of these jacks shape, one is the " herringbone " , one is the "diamond ." Herringbone jack , light weight, small volume after folding up a good store , the disadvantage is to support the weight of small, not very strong, generally used for about 1 ton of the family car. Principles and diamond jack herringbone similar, before use to familiarize yourself with crank assembly before use.

    Mechanical jack : by rotating the threaded rising effect achieved by the thread self-locking effect to support heavy loads. This jack simple structure, endless corruption and relatively large weight-bearing , transmission efficiency ratio is low, the rise and fall is slow and larger self , using them is a manual labor.

    Hydraulic jacks : the use of hydraulic jacks used to lift up more time-saving , the principle is to manually oil reservoir chamber pressed into the cylinder through the check valve to lift heavy loads. This jack lift and back down fast, able to withstand the weight of 3 tons , car repair workshop can see it, but the volume is large, extremely inconvenient to carry , though easy to use but also consider the interior space and aesthetics degrees, so basically which car would not have such a monster configuration .

    Inflatable jack : This jack is still rare, the basic tools are purchased separately . Inflatable jack for more special environment, such as off-road vehicles of self-help and rescue , road tough rescue . Its principle is through the hose connected to the car exhaust pipe , use a set of car emissions to air bag inflator to achieve a supportive role. Set air bag is very tough to withstand the weight of about 4 tons , but also because without traffic restrictions , eliminating the hassle of finding a flat ground , readily available.

    Precautions

    1 in the car before the first fixed to the vehicle , in order to avoid the process of lifting the car skidding and bring damage. Fixed light vehicles using the handbrake is not enough, the safest way is to pull the handbrake while the manual transmission models linked into a file or reverse gear, automatic models will pull up the handbrake gear can be pushed to the P file .

    2 jacks must be placed on a hard flat ground , if unfortunately the car breaks in the soft ground or sand , you can use the hard texture of wood point to guarantee the jack jack support angles, different environments are different ways However, we must ensure that the jack and secure. It also can be made ​​to put the spare tire on the chassis , if Jack unfortunate " died " a spare tire can also "reveal all ."

    3 vehicle inner side skirts and side skirts are parallel to jack the anchor by hand can touch , then be sure to use the jack support on a dedicated anchor , anchor manufactured from sheet strength comparisons large . Like other parts of the guard under the engine , suspension lower arm should avoid jack support , because of their low intensity appeared to slip easily cause unnecessary damage.

    4 When using the jack is usually carried out using hand-cranked lift , when in use force must be uniform , remember too much too fast . Especially in just contact with the body , be sure to confirm the location and stability of the jack , if too much force is easy to position and angle of the jack touch crooked , lifting lower and lower down again laborious , as from the beginning of a steady rise in demand good .

    Jack by the physical effect, so not many difficulties in the use of things , but if you do not pay attention to use , had a multiplier things will become less effective.