A factory, inspected the new car before the warranty expired and will go wrong, it seems incomprehensible, but also very "normal".
Why, then, the new car will go wrong? To answer this question we must first know the life expectancy index is the value calculated according to the choice of materials, processing methods, and expected conditions of use and other factors. Due to defects in materials, processing and use of uncertainty factors, does not guarantee the life of each part is consistent.
Second, we must understand the parts life testing methods. The life test is a destructive test, the service life measured out, the parts will be scrapped. Therefore, the life of the parts used in sampling test method. Take a small amount of sample to be tested, according to test results to estimate the life of these parts in a large number of materials, processing conditions are the same parts. Because the factory inspected products may not be able to achieve in life expectancy.
But also to understand the meaning of the parts of life indicators. The life expectancy index is a probability indicators, such as the car most of the rolling bearing, the life is in good condition was based on. Take 1000 some kind of rolling bearing life test as samples, may appear as follows: after running 100 hours a bearing damage, running after 100,000 hours, two bearing destruction operation after 150,000 hours, 5 bearing destruction and operation of one million hours 10 bearing destruction ... So, 95% intact rate condition rated life of 150,000 hours rated life to 90% intact rate conditions for 1 million hours. In other words, you car is filled with a rated life of one million hours of bearing, running 100 hours on the destruction is also the probability index.
To sum up, the parts of life index is a calculated value, the design selection of eligible parts in accordance with this value. However, parts of the so-called qualified sampling the sample in line with a good rate under the conditions to reach the rated life. Therefore, the lifetime value of the parts is a probability. The entire batch of parts to meet the design requirements, and specific to each part, its life may be larger than the rated value, may also be smaller than the rated value. On any one brand of car in the world can not be without failure, the difference is more or less, the structure of the modern car is much more complex than in the past, tens of thousands of parts, some of the defects in the course is not surprising. Mercedes-Benz is the brand-name goods, but does not guarantee that no problems per vehicle for each part. Do not think that new car or a brand-name car can sit back and relax, but the probability of failure is relatively low it. It seems that absolutely no problems the car really is not readily available.



Other News:
British show has crashed a pilot died
Auto parts life detection
Britain allow
Obama complaints made in China collection U.S. car anti-dumping duties
The rolling bearing types of choice
China and Japan BBS reached a consensus
Pakistan to restart NATO supply lines
The choice of rolling bearing elements