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Patent Searching and Data

Document Type and Number:
Japanese Patent JP3881241
Kind Code:
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.

Crofts, John, Dee.
Morris, C., Edward
Benson, Donald, Jay.
Application Number:
Publication Date:
February 14, 2007
Filing Date:
January 08, 2001
Export Citation:
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Cummins Engine Company, Inc.
International Classes:
F02M47/00; F02M47/02; F02M63/00
Domestic Patent References:
Attorney, Agent or Firm:
Atsushi Nakajima
Kato Kazunori
Katsuichi Nishimoto