Abstract
Keywords:
Diesel Engine, Fuel Injection Pump, Cylinder Block, Vibration, Experiment, Finite Element Method, High- Pressure Type, Transfer Function, Modal Shape, Free Decay, Vibration Reduction, Stress, Natural Frequency
Abstract
Reduction of fuel consumption is important for the detrimental constituent contained in the exhaust gas of an automobile. The fuel consumption of a diesel engine with a higher compression ratio is advantageous compared with that of a gasoline engine. However, the selling number of the diesel automobiles in Japanese market, where the automobiles must be required to discharge particulate matter (PM), has been lower from a viewpoint of a city environmental problem, while the selling number of diesel automobiles is increasing in Europe every year. The other reason is that the engine vibration and noise are bigger than those of a gasoline engine. One of the countermeasures is the engine weight saving of diesel engines. The weight of the cylinder block, which is approximately 35% of total of engine weight, provides to fuel consumption of the engine more by saving itself weight. Moreover, in order to reduce PM, high-pressure injection of fuel is useful for an internal combustion improvement to reduce the detrimental constituent contained in the exhaust gas. Although a common-rail type fuel injection pump is mainly used in Europe, America and Japan, many mechanical sequence type fuel injection pumps are used in south-east Asian nations. Vehicle an engine weight saving and the higher-pressure injection of fuel into the cylinder are effective methods as the antipollution measure, a new problem occurs in the increase of engine noise and vibration, the decrease of durability and reliability of the diesel engines. This study describes the weight saving and lower vibration of a cylinder block, fuel injection pump and cylinder from vibration experiments and FEM analysis. We clarified the vibration characteristics of the cylinder block with the fuel pump of a small diesel engine after analyzing each vibration characteristics of the cylinder block, body of fuel injection pump by using FEM. As a result, the following things are gotten; [1] A fuel injection pump is influenced by the vibration characteristics of a cylinder block and a bracket. [2] A bracket is influenced by the vibration characteristics of a cylinder block. [3] The analysis made it possible to examine a cylinder block, oscillating reduction of a fuel injection pump, and a weight saving.