张悦1，史文献1,2，吴士军1,2，周帅2,3，周明胜1,2
1.潍柴动力扬州柴油机有限责任公司，江苏扬州225009；2.内燃机可靠性国家重点实验室，山东潍坊261061；3.潍柴动力股份有限公司，山东潍坊261061
摘要：针对某四缸直列轻型柴油机存在的掉缸故障，采用台架振动测试、道路振动测试、振动疲劳试验以及端子保持力测试等测试手段，系统地分析掉缸故障原因。结果表明：柴油机掉缸原因为喷油器接插件端子保持力可靠性不稳定，在线束拉扯力和振动的相互作用下导致接触件断路。通过改进喷油器接插件结构型式，采用更稳定的接插件端子，优化线束走向，重新设计大刚度的固定支架，优化高压油管管型并增加固定管夹等措施，彻底消除掉缸故障。
关键词：掉缸；振动测试；疲劳耐久；保持力测试
Abstract:The problem of misfire for a four cylinder inline light diesel engine is investigated. Engine vibration test, road vibration test, durability test and terminal retention test are used to systematically analyze the causes of misfire. The results show that the main cause of misfire is the instability of the terminal retention force of the injector connector, which leads to the open circuit of the contact under the interaction of the pulling force and vibration of the wire harness. By improving the structure of injector connector, adopting more stable connector terminals, optimizing the direction of wiring harness, redesigning the fixed bracket with large stiffness, optimizing the highpressure oil pipe and increasing the fixed clamp, the misfire fault is completely eliminated.
Keywords:diesel misfire; vibration test; durability test; retention test
|
