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首页> 外文会议>International Pacific Conference on Automotive Engineering >Dynamic Characteristics of Cylinder Head Gaskets for Diesel Engine by Abrupt Change of Cooling Water Temperature and also by Reduction of Tightening Torque of Cylinder Head Bolts
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Dynamic Characteristics of Cylinder Head Gaskets for Diesel Engine by Abrupt Change of Cooling Water Temperature and also by Reduction of Tightening Torque of Cylinder Head Bolts

机译：通过冷却水温突然变化柴油机气缸盖垫圈的动态特性，以及缸盖螺栓拧紧扭矩

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摘要

The cylinder head and the cylinder block of high speed diesel engines for automobiles have lost their rigidity because of weight reduction, utilizing aluminum material and thinner wall thickness. Moreover, both higher output engines and highly turbo charged engines caused gas leakage of the cylinder head gasket through unbalanced sealing conditions. However, the gasket should not leak and should have the durability under high output and highly turbo charged conditions. Then, the dynamic characteristics of the cylinder head gaskets for diesel engines must be clarified from the analytical and experimental standpoints. Experiments on a small, one-cylinder diesel engine were performed by changing the temperature of cooling water, and also by reducing the tightening torque of the cylinder head bolts. Three kinds of test cylinder head gaskets were made by varying the material and the configuration of the cylinder head gaskets. The ambient temperatures at several points of each cylinder head gasket and in its peripheral region were measured in heating and cooling temperature cycle by abrupt change of water during steady operation. The relative displacements between cylinder head and cylinder block, the loads of the cylinder head bolts and the indicator diagram were also measured in the same way. The effect of the temperature differences among the cylinder head, cylinder block and head bolts both on the loads of the head bolts and on the relative displacements were observed by the above-mentioned experiments for the test gaskets. Moreover, the gas leakage was observed by utilizing a leakage detective device during engine running on the condition of reduction of the tightening torque. The sealing characteristics both in the transient state and in the steady state of the cooling water temperature were investigated from an experimental standpoint. The investigation on the gas sealing characteristics in the transient and steady states is the main purpose of this experimental study.
机译：由于重量减轻，利用铝材料和较薄的壁厚，气缸盖和用于汽车的高速柴油发动机的高速柴油发动机的缸体已经失去了刚性。此外，较高输出发动机和高压涡轮增压发动机通过不平衡的密封条件引起了气缸盖垫圈的气体泄漏。但是，垫圈不应泄漏，应在高输出和高涡轮增压条件下具有耐用性。然后，必须从分析和实验观点澄清柴油发动机的气缸盖垫圈的动态特性。通过改变冷却水的温度来进行小型一缸柴油发动机的实验，以及通过减小气缸盖螺栓的紧固扭矩来进行。通过改变材料和气缸盖垫圈的构造来制造三种测试气缸盖垫圈。通过在稳定操作期间通过水突然变化，在加热和冷却温度循环中测量每个气缸盖垫圈和其外围区域的周围区域的环境温度。汽缸盖和气缸体之间的相对位移，气缸盖螺栓的负载和指示器图也以相同的方式测量。通过上述测试垫圈的实验观察到汽缸盖，缸体和头部螺栓之间的温度差异在头部螺栓的负载和相对位移上的影响。此外，通过在发动机运行在减小紧固扭矩的条件下，通过利用泄漏检测装置观察气体泄漏。从实验的角度研究了瞬态状态和冷却水温度稳定状态的密封特性。瞬态和稳定状态下气体密封特性的调查是该实验研究的主要目的。

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