Patent ID: 6062489
Filing Date: 2000-05-16
Classification: F02M

Abstract:
A fuel injection device for engines comprising:a device body having nozzle holes for injecting fuel;a needle valve reciprocating in a hollow portion in the device body to open and close the nozzle holes at one end thereof;a balance chamber in which is exposed the other end of the needle valve that forms a pressure receiving surface to receive a fuel pressure to control the lift of the needle valve;a supply passage to supply the fuel pressure to the balance chamber;an exhaust passage to release the fuel pressure from the balance chamber;an open-close valve to open and close the exhaust passage; andan actuator to drive the open-close valve;wherein the open-close valve comprises a valve stem piercing through the exhaust passage and extending into the balance chamber and a valve head provided at an end of the valve stem, wherein the valve head has a valve face that, when the valve is closed, contacts a valve seat formed at an inlet port of the exhaust passage, andwherein the actuator drives the open-close valve to adjust the lift of the open-close valve and an effective opening area of the exhaust passage so as to set a fuel injection rate and lift speed of the needle valve.