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The multi-impact characteristics and failure mechanism of two kinds of automotive enginechain made in China are studied through engine assembly and road-drive tests. The worn surfacemorphologies of rubbing area between pin, bush and roller are also analyzed based on scanning elec-tron microscope. The results show that the main wear mechanism of automotive engine chain is fa-tigue wear, and its failure mechanism is the forming, extending and flaking of cracks on top layer ofpin and bush. In addition, the material, hot-treatment method and shaping technique for roller have agreat influence upon the resistance to multi-impact. Ensuring sufficient strength and plasticity ofroller, as well as adopting suitable shaping technique are the effective method to increase its resistanceto multi-impact.
The multi-impact characteristics and failure mechanism of two kinds of automotive enginechain made in China are studied through engine assembly and road-drive tests. The worn surfacemorphologies of rubbing area between pin, bush and roller are also based on scanning elec-tron microscope . The results show that the main wear mechanism of automotive engine chain is fa-tigue wear, and its failure mechanism is the forming, extending and flaking of cracks on top layer of pin and bush. In addition, the material, hot-treatment method and shaping technique for roller have agreat influence upon the resistance to multi-impact. Ensuring sufficient strength and plasticity of roller, as well as adopting suitable shaping technique are the effective method to increase its resistanceto multi-impact.