Patent ID: 7770818

Claim:
A fuel injection valve comprising: a housing having a tip end defining a nozzle hole, the housing further having a wall surface on an opposite side of the nozzle hole, the housing further having a fuel passage opening in the wall surface, the fuel passage communicating with the nozzle hole through a nozzle cavity; a valve element accommodated in the nozzle cavity for opening and closing the nozzle hole; a cylinder having one end substantially in contact with the wall surface, the cylinder having an inner circumferential periphery slidably accommodating one end of the valve element, the cylinder partitioning the nozzle cavity substantially into a fuel accumulator chamber and a pressure control chamber; and a spring for biasing the cylinder to the wall surface, wherein the fuel accumulator chamber is adapted to accumulating fuel supplied from the fuel passage, the pressure control chamber is adapted to accumulating fuel for manipulating the valve element, the cylinder has an outer wall defining a deflecting surface adapted to radially outwardly deflecting fuel flowing from the fuel passage, the cylinder has a small diameter portion and a large diameter portion, the small diameter portion has one end having a contact portion substantially in contact with the wall surface, the large diameter portion has one end having a spring seat for supporting the spring, the small diameter portion has an outer wall defining the deflecting surface, the small diameter portion and the large diameter portion therebetween define a step portion, the fuel passage has a diameter d, the fuel passage has an opening in the wall surface, and the opening is at a distance of x from a location where fuel supplied to the nozzle cavity through the opening flows at highest flow velocity and collides against the step portion, and the deflecting surface has a length to satisfy: x≧3d.