Crank bar linkage is direct get in touch with high temperature gases at high pressure when the engine is that carry-scraper driving force source , engine work,the crank shaft revolution speed is very high , piston advance and return movement linear speed is pretty big , waste gas gets in touch with the combustible gas mixture and combustion at the same time , crank bar linkage accepts the chemistry corrosion effect, and lubricating difficulty. It can be seen that crank bar linkage running conditions is pretty very bad ,it needs to bear high temperature.

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