Patent ID: 7721716
Filing Date: 2010-05-25
Classification: F02M

Abstract:
1. A high pressure fuel injector for direct injection of fuel into a cylinder of a compression ignition engine, said fuel injector comprising: a piezoelectric actuator disposed within a rigid housing, said piezoelectric actuator having a first end seated against said housing at a distal end and a second end operatively coupled to a piston movable within a bore within said housing; said housing having a fuel input port and passage formed in said housing, said passage coupling said fuel to an inlet side of said piston; said piston having an input check valve formed thereon to allow passage of fuel from said input chamber to a pressurization chamber on a pressurization side of said piston; said pressurization chamber coupled to a nozzle assembly; said nozzle assembly having a spring loaded member pressing against a conical seat at a conical angle; wherein during operation, the piezoelectric actuator is driven by an electrical pulse causing the piezoelectric actuator to lengthen, driving the piston toward the nozzle assembly, closing the input check valve, and generating a high pressure in the pressurization chamber; the high pressure is coupled through said fuel to the spring loaded member and deflects the spring loaded member open allowing a portion of said fuel to exit between the spring loaded member and the conical seat, dispersing said portion of said fuel in accordance with said conical angle of said conical seat.