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Bottom-feed-injector-with-top-calibration-feed

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Bottom feed injector with top calibration feed

Details

Inventors: Nally, Debora E.; Wieczorek, David P.;
Assignee: Siemens Automotive Corporation (Auburn Hills, MI)
Primary Examiner: Weldon; Kevin
Assistant Examiner:
Attorney, Agent or Firm: Wells; Russel C.

A bottom feed engine fuel injector is provided with a valve spring calibration adjuster such as an adjusting tube, which permits fuel flow from the top of the injector during manufacturing calibration and run in. The upper end of the injector is capped in the last manufacturing step after calibration to prevent fuel passage through this opening in normal engine use where bottom fuel feed is used in conventional fashion. Several exemplary adjusters and top feed closing embodiments are illustrated and described. The modified injector structure and manufacturing process reduces costs by allowing both top and bottom feed injectors to be assembled and calibrated on the same manufacturing equipment.

DETAILED DESCRIPTION The present invention provides improved embodiments of bottom feed injectors which utilize calibration means similar of those of top feed injectors and allow fuel for calibration and run in to be delivered through the top of the injector in the same manner as with top feed injectors.
Means for blocking off the side inlet ports of the bottom feed injector must also be provided on the line.
Thus, both top feed and bottom feed injectors are able to be assembled, calibrated and run in on the same manufacturing line, reducing the overall manufacturing cost and increasing flexibility.
These and other features and advantages of the invention will be more fully understood from the following description of certain exemplary embodiments of the invention taken together with the accompanying drawings.

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