Patent ID: 6823833
Filing Date: 2004-11-30
Classification: F02B,F02D,F02M,G01F,Y02T

Abstract:
A swirl injector for a direct injection internal combustion engine, which swirl injector is controlled by a triggering circuit, comprising:(a) a valve body having a fluid passage defined therethrough, the valve body having a fluid inlet at a first end and a nozzle defining a conical valve seat at a second end, which nozzle is for discharging fuel, the nozzle further defining a discharge orifice in fluid communication with the conical valve seat, the valve body further having a shock brake ring disposed in the fluid passage and defining an upper valve body portion and a lower valve body portion; (b) a solenoid disposed in the valve body, the solenoid having a coil and an electrode electrically connected to the coil, the electrode being adapted for connection to the triggering circuit for energizing the solenoid; (c) a needle valve having a head at a first end and a tip at a second end, the needle valve having a disk about its circumference, the needle valve being disposed in the fluid passage with the disk disposed in the lower valve body portion and the head extending at least partially inside the coil of the solenoid, the needle valve having a plurality of spiral grooves adjacent the tip; and (d) a compression spring disposed in the upper valve body portion; (e) wherein the compression spring biases die needle valve to a closed position in which the needle valve tip is seated against the conical valve seat defined in the nozzle and wherein the solenoid moves the needle valve to an open position in which the needle valve tip is moved from the conical valve seat in order to discharge fuel from the nozzle.