摘要
某发动机在冷热冲击试验中多次发生了气缸垫漏机油问题,而全速全负荷试验未发生该问题。为查明原因,对稳态及瞬态工况下气缸垫密封进行对比分析,并研究不同瞬态工况冷却液温度控制对缸垫密封性能的影响。分析结果表明,稳态工况下气缸垫满足密封要求,而冷热冲击工况中排气侧后端密封压力较小,其发生在转速及冷却液温度快速上升阶段,与试验现象高度一致。而减小冷却液温度上升速率可显著提高密封压力。
A problem of oil leakage in the cylinder gasket occurred many times in thermal shock test of engine,but the problem did not occurred in the full load test.In order to find out the reasons,the cylinder gasket seals under steady and transient conditions were compared and analyzed,and the influence of coolant temperature control under different transient conditions on the sealing performance of cylinder gasket was studied.The analysis results show that the cylinder gasket meets the sealing requirements under the steady state condition.However,the sealing pressure at the rear end of the exhaust side is small in the hot and cold shock condition,which occurred in the stage of rapid rise of speed and coolant temperature,which is highly consistent with the test phenomenon.Reducing the coolant temperature rise rate can significantly increase the seal pressure.
作者
李云涛
郭小凤
路明
蓝军
Li Yun-tao;Guo Xiao-feng;Lu Ming;Lan Jun(Ningbo Geely Luoyou Engine Parts Co.,Ltd.,Zhejiang Ningbo 315336)
出处
《内燃机与配件》
2023年第6期1-3,共3页
Internal Combustion Engine & Parts
关键词
瞬态温度场
缸垫密封
有限元方法
冷热冲击
Transient temperature field
Cylinder gasket sealing
Finite element method
Cold and hot shock
