First of all, because Japan uses high-precision machine tools to process engine parts, they fit perfectly after assembly. The car is equipped with such an engine, and there is no abnormal sound, oil leakage, oil burning and other phenomena, and the frequency of repairing cars is not so high, so it can be put on the market. Guaranteed sales. Japan has made in-depth research on equipment accuracy, far exceeding its rivals. Even if the drawings of the engine are published, it is difficult for others to build the same engine.
then attach great importance to the protection of technology. Even if a country has a joint venture with a Japanese car company in China, the Japanese car company will only assemble it. When it comes to product development-related projects, it will only be used. Japanese people, even those who study in other countries, are rare, which shows how strict the Japanese are in protecting engines.
furthermore, the processing technology in Japan is very developed. In the process of assembling the engine, every step is completed by professional workers. In addition to heat treatment, low temperature assembly is also adopted. This is also a unique technology of Japanese car companies, which is difficult to imitate. Most parts on the engine are connected by holes and shafts, and some are fixed by screws. This is a key link, related to the quality of the engine. If the gap between parts is too large, abnormal noise will occur. Or oil leakage. When the engine is assembled to the over-matching stage, it must be carried out at low temperature first, and then heat treatment is carried out after the parts are assembled. Under the huge temperature difference, the shaft sleeve of the part will not slip in the hole, that is, the principle of thermal expansion and contraction is used.
attaches great importance to patent protection. Therefore, even if you steal the relevant technology, Japanese car companies will sanction or even withdraw from China, which is a huge loss for a country. Japan started to make cars from the beginning, imitated them all the way, and then began to make bold innovations after summing up experience. This process is very difficult. In addition, cars are the backbone of Japan's domestic economy. Once the core technology is leaked, Japan will be hit hard, so they should not only keep the core technology secret, but also imitate the technology of other countries.