| 摘要 |
PURPOSE:To facilitate valve opening control of a control valve for opening/ closing a communication port by providing a small communication hole for communicating a main chamber with the upper part of an auxiliary chamber, besides a communication port between the main and auxiliary chambers. CONSTITUTION:A control valve 5 equipped with a valve seat 33 on the main chamber side of the communication port 32 below an auxiliary chamber 3 is supported by an axial hole 31 above the auxiliary chamber 3, and an electromagnetic device 6 for lowerqing a control valve 5 is arranged. A small communication hole reaching the upper side of the auxiliary chamber 3 from the main chamber 12 is provided and compressed air inside the main chamber during a compression stroke is led to the upper side of the auxiliary chamber, and upward auxiliary atomization injected from an injection nozzle 35 is combusted, and the control valve 5 is opened by the thrust of an electromagnetic device 6 together with expansion force and unburnt air-mixture caused by main atomization 37 is pressure-fed to the main chamber 12. |
