Patent ID: 6830202
Filing Date: 2004-12-14
Classification: F02M

Abstract:
A fuel injector comprising:a barrel defining a first fluid passage, a second fluid passage and a piston bore including an upper bore and a lower bore; an intensifier piston including a shoulder and a stepped top; a first actuation cavity defined by said upper bore, said stepped top and said first fluid passage; a second actuation cavity defined by said lower bore, said shoulder and said second fluid passage; said piston being slidably received in said piston bore wherein said shoulder is received in said lower bore and said stepped top is received in said upper bore; said stepped top having a first surface open to fluid pressure in said first actuation cavity and said shoulder having a second surface open to fluid pressure in said second actuation cavity; said piston being moveable between a first position and a second position; said stepped top being sealable with said upper bore when said piston moves between said first position and said second position; a source of actuation fluid; a drain passage; a control valve to open and close fluid communication between said first and second fluid passages and said source of actuation fluid and said drain passage.