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对于所有往复式四冲程内燃机和直流扫气的二冲程内燃机来说,气门是不可缺少的零件。气门是进气门和排气门的泛称。无论是进气门或排气门在关闭状态必须密封良好,气门的任何细小损坏或漏气均使发动机不能正常工作;如果气门头部掉块或断裂而落入气缸会造成发动机的严重破坏。可见气门虽小,影响却大,所以国内外纷纷从设计、材料、金相、热处理工艺、冷热加工等方面,对气门进行试验研究,不断提高其可靠性和使用寿命。
For all reciprocating four-stroke internal combustion engines and two-stroke DC scavenged internal combustion engine, the valve is an indispensable part. Valve is the general term for intake and exhaust valves. Neither the intake valve nor the exhaust valve must be well closed in the closed state. Any minor damage or leakage of the valve will make the engine unable to work normally. If the valve head is dropped or broken, falling into the cylinder may cause serious engine damage. Visible valve is small, the impact is large, so at home and abroad have from the design, materials, metallography, heat treatment process, hot and cold processing, the valve test research and continuously improve its reliability and service life.