Analysis of the reasons for the frequent blowout accident

1.Overload causing a puncture
At present, the domestic highway overload freight cars running situation are relatively common, quite a part of the individual transport people think, freight cars do not overload is not profitable. However, one of the main causes of freight car tire overload is.

At present, the domestic production and use of freight cars commonly used high-pressure tires, large capacity dual rear wheels generally tire. In normal circumstances, when the load on the wheels when the maximum allowed value, the internal pressure of the tire pressure of 5-7 atm, when freight cars of the actual load exceed the maximum permissible load of the wheel, the tire will increase the internal pressure large, the internal pressure of the tire when the tire valve sealing pressure over time, it will cause a flat tire, a rear wheel bearing capacity if there is a flat tire and the driver failed to find that it will lead to post-wheeled the load is too large and another tire puncture.

In addition, freight car long time use of brakes, brake drum will gradually produce high temperature, because the freight car tire valve close to the middle position tire rim inside, away from the brake drum is very near, high temperature brake drum production will make the valve at the bottom of the rubber expansion and deterioration of sealing variation, freight car that often run in mountain areas, hilly area because of long time, often have to use of brakes, tire valve sealing ordinary poor, therefore a higher probability.

2.Speeding caused a puncture
The common models and tire for speeding is small-sized passenger car, especially senior car performance good. On the highway, some good performance of the car at the speed of more than 110 kilometers per hour, senior car performance similar to overtake each other on the highway, the higher speed.

Tire pressure on modern cars is usually adopted, when the load on the wheel for the maximum permissible value, the tire inner pressure between 1.5 and 1.4 ATM, the car at high speed in the case of long time, the tire and the ground friction will generate a lot of heat, the heat accumulated to a certain degree, will cause the tire itself high temperature.

The adverse effects of high temperature on the tire has two aspects, one is the tire itself expansion and compressive variation; two is to make the air in the tire inflation causes the tire inner pressure. In addition, maintains the high speed running car tire long time, maintain a relatively stable state of the contact surface of the tire and the ground is a long time, tire strain surface difficult to be adjusted, this state maintained for a long time, tend to make more than the tire load and tire pressure strain intensity of the tire.

3. The road condition is not good

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How to judge the brakes when need to change?

A new brake pad thickness is about 1.5cm, with the use of continuous friction thickness becomes thin. Professional and technical personnel, when the brake pad thickness is only the original 1/3 thickness observed by naked eye (about 0.5cm) or so, the owner should increase self frequency, ready to replace at any time. Of course, the individual models because hub design reasons, do not have the naked eye viewing conditions, need to remove the tire to complete.

Each brake pads on both sides of a raised flag, this flag in a couple of millimeters thick, which is the thinnest disc replacement limit, if the thickness of the brake pads have been parallel with this flag, you have to be replaced.So when the brake pad thickness close to the mark, the owner must observe the preparations, but not remove the tire situation through the naked eye is difficult to accurately observe, many models of instruments in the brakes too thin when the hand brake lamp position will be prompt, self-test is relatively convenient.

Tips:Brake pads under the car and driving habits without replacement interval strict, generally in the traveling sixty thousand kilometers is about to consider replacement. When the naked eye observation of brake thinner should be in the maintenance requirements and technical personnel to carry out inspection, because the eye will have errors, professional repair station through the caliper than naked eye observation more rigorous.

If the tap the brakes at the same time "iron loiter iron" hiss, the brake pads must be replaced immediately. Because the ultimate mark on both sides of the brake has direct friction brakes, brake has proved over the limit. Encounter this kind of situation, in the replacement of brake at the same time with the brake disk check, this sound is often the brake disc is damaged, then even if the replacement of new brake pads is still unable to eliminate noise, serious when the need to replace the brake disc.

Tips:When heard the brake voice often late, the brake disc will be more or less damage. Brake disc brake price compared to much higher, it is recommended that you frequently check brake pads, brake disc of things to avoid injury.

When the brake pad became thinned that our braking effect will be affected,at this time need a deeper brake pedal in order to achieve the original light step braking effect can be achieved,the first half of the braking effect is weakened, many people feel the brakes become soft, a bit not brake, this is the time to check whether the brake pads need to be replaced.

Tips:This method is relatively abstract, feel some not good grasp, therefore, to develop a good habit of self-test is very important.In addition the braking effect decreases the brake oil consumption increased at the same time, so the replacement brake to check on the brake oil condition.

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Engine maintenance tips

1.Lubricating oil using the appropriate quality grade. On the gasoline engine exhaust system should be based on the additional device selection and the use of the SD-SF gasoline engine oil; diesel engine according to the mechanical load selection of CB-CD grade diesel engine oil, use standard of not less than the manufacturer specified requirements shall prevail.

2.Oil and filter change regularly. Lubricating oil any quality grade in the using process of the oil will change, in order to avoid failure, should be combined with the conditions of use regular oil, and the oil quantity is moderate (generally in oil rod cap.).

3.To keep the crankcase ventilation. Now most of the gasoline engine is equipped with PCV valve (mandatory crankcase ventilation installation), but the pollutant gas channeling in around deposition in the PCV valve, the valve plug may. Therefore, pollutants shall be regularly cleared PCV around the valve.

4.Regular cleaning of crankcase. The engine in the process of running, the combustion chamber pressure unburned gas, acid, water, sulfur and nitrogen oxides after clearance between piston rings and cylinder wall into the crankcase, and powder metal parts wear the mixed together, forming sludge. Therefore, should be cleaned regularly to keep the engine crankcase, internal cleaning.

5.Regular cleaning fuel oil system, controlling the formation of coke, so the engine can maintain the best state.

6.The engine water tank rust, scale is the most common problems. The cooling system of rust and scale can limit the cooling liquid in the flow, reduce the cooling effect, causing the engine to overheat, even cause engine damage. So in the regular cleaning tank, remove the rust and scale.

Maintain filter: filter refers to the air filter, oil filter, fuel filter. Filter for air in automobile engine, oil and gasoline plays a role of filtration, thus protecting the engine, but also improve the work efficiency of the engine.

Most riders in the face of diesel condensation occurs, the misunderstanding, method of operation is not standardized, easy to damage the vehicle, there are security risks. As in the diesel fuel blending gasoline, will bring the following problems.

First, it enables the vehicle difficult cold start, start times to be a car; the second vehicle combustion deterioration, a portion of the fuel cannot be fully combustion, the fuel consumption increased significantly, decreased sharply increase horsepower, exhaust pollution. In addition, the service life of the engine will have a great influence. In particular, direct baking tank approach, both time-consuming and laborious, but also very dangerous, should put an end to this kind of mistake.

At the same time, consumers are also the universal existence of such a mistake, think of No. 0 diesel oil as long as the temperature can be normal use in 0 ℃, this is mainly due to the diesel antifreeze properties do not understand the cause. To measure diesel antifreeze performance indicators are mainly two, namely the cold filter plugging point and freezing point. Condensation point is the highest temperature diesel loss of mobility in the environment of low temperature; cold filter plugging point through the engine fuel injection system for diesel will be caused by high temperature filter clogging. The national standard diesel No. 0 cold filter plugging point is 4 ℃, the pour point is 0 ℃. No matter what kind of label of diesel, as the temperature drops, it first passes through the cold filter plugging point after condensation point.

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