| 摘要 |
PURPOSE:To realize fuel injection at high pressure so as to enable injection with invariable reliability from a very small to large amount of fuel by using a solenoid driving spool pipe control valve with five ports as a pilot valve, and providing two logic valves each of which communicates with an oil passage leading to the large diameter side of a servo valve. CONSTITUTION:When the coil 106 of a spool pipe control valve 19 is excited and a spool valve 103 is moved downward, high pressure acting on the large diameter side oil passage 15 of a delivery-start logic valve 11 from a pressure accumulator 22 is closed and communicated with a drain pipe 21 whereby the pressure is lowered. Further, pressure from the pressure accumulator 22 acts on the large diameter side oil passage 17 of a delivery end logic valve 16 and the logic valve 16 is exerted at its closing side with a large force. When a small diameter plunger 2 is thrusted upward by a large diameter plunger 8, fuel allowed to flow into a space above the small diameter plunger 2 has its pressure boosted and thrusts the delivery valve 5 upward and is allowed to pass through an injection pipe 6 and injected into a cylinder from a fuel valve 7. |
