Patent Number: 6,293,254

Title: Fuel injector with floating sleeve control chamber

Abstract: A fuel injector including a floating sleeve control chamber is provided which effectively minimizes friction and wear, and thus prevents stiction, of a nozzle valve element by avoiding the need to align two bore guiding surfaces for the element. The floating sleeve control chamber includes a floating sleeve positioned on a control piston formed integrally with a nozzle valve element and positioned in a cavity. The floating sleeve is sized with an outer extent or diameter sufficiently less than the size of a surrounding cavity wall so as to permit lateral movement of the floating sleeve and thus movement of the control chamber. Only the nozzle valve element guiding bore surfaces control the alignment of the nozzle valve element relative to its seat while the floating sleeve effectively forms and seals a floating control chamber. The floating sleeve may be formed from one or more sleeve sections. In addition, the floating sleeve may include one or more swivel joints to accommodate perpendicularity errors between the components.

Inventors: Crofts; John D. (Edinburgh, IN), Morris; C. Edward (Columbus, IN), Benson; Donald J. (Columbus, IN)

Assignee: Cummins Engine Company, Inc.

International Classification: F02M 47/02 (20060101); F02M 63/00 (20060101); F02M 041/00 ()

Expiration Date: 09/25/2018