シリンダライナ及びシリンダブロックにおけるキャビテーションエロージョンに関する研究

(シリンダライナ振動計算法に関する研究)

抄録

Cavitation erosion may sometimes occur on cylinder liners or cylinder blocks to cause serious troubles to penetrate them. It had been clear that its phenomenon was resulted from the liner vibration by piston slap. So we studied the calculation method of piston slap and transient response of liner and became to be able to estimate the possibility of the generation of cavitation erosion without running engines.
Many researches have been done and many calculation models have been proposed about piston slap. But some are considered to be insufficient or too complicated for industrial use. So we considered the new calculation model — the force of the oil film between piston and liner ruled the movement of piston. And we assumed two separate oil film for the purpose of treating translational and rotational motion.
We guessed that the force added to liner was equal to the reaction force which piston received from liner and got the wave form of force from the acceleration of piston.
We made a FEM model of cylinder liner and cylinder block to calculate the transient response of liner. We added the force to the model, changing its form into equivalent triangle form.
Then we got a good relation between measured and calculated liner vibration.