Patents Assigned to Alfred J. Buescher
  • High-pressure dual-feed-rate injector pump with grooved port-closing edge
    Patent number: 6009850
    Abstract: A groove having a helix angle of zero or more is formed in the plunger of a diesel injector pump, the groove extending along and in association with the port-closing edge of the plunger and along at least a portion of the length of such port-closing edge. The groove interacts with the port that is associated with the port-closing edge to provide, in each of a succession of plunger strokes, initial fuel injection at feed rates lower than those which would obtain in the absence of the groove but without any loss of initial injection pressure, or without substantial loss of such pressure.
    Type: Grant
    Filed: April 10, 1998
    Date of Patent: January 4, 2000
    Assignee: Alfred J. Buescher
    Inventor: Frank DeLuca
  • Injector nozzle with improved engine combustion efficiency
    Patent number: 6007000
    Abstract: A diesel unit injector of the END type is provided with a sac whose center of volume is located below the center of radius of the sac bottom. The bottom-most parts of the annular cavity which is above the seat for the nozzle valve are shaped to provide compensatory structural reinforcement.
    Type: Grant
    Filed: June 16, 1998
    Date of Patent: December 28, 1999
    Assignee: Alfred J. Buescher
    Inventor: Frank DeLuca
  • High-pressure dual-feed-rate injector pump with auxiliary spill port
    Patent number: 5870996
    Abstract: A diesel fuel injector is provided with a secondary spill aperture operable to increase to a maximum value and then decrease to zero during an early part of the injection portion of the stroke of the injector pump plunger in a manner to maintain injection pressure at relatively high levels at the beginning of such injection portion of the plunger stroke whereas the rate of injection is lower during such early part of such injection portion than it would be in the absence of said secondary spill aperture.
    Type: Grant
    Filed: April 10, 1998
    Date of Patent: February 16, 1999
    Assignee: Alfred J. Buescher
    Inventor: Frank DeLuca
  • Unit injector optimized for reduced exhaust emissions
    Patent number: 5467924
    Abstract: A diesel unit injector of the EMD type is provided with a tip whose radius is centered below the center of radius of the sac which it encloses, and the sac volume is minimized. The lower face of the nozzle body of the injector is faired in such a manner as to maintain a strong wall cross-section. A system utilizing a set of potential substitute spring seats is used to reset the opening pressure, as upon rebuilding, within narrow tolerances. The nozzle body is shortened and the check valve cage correspondingly lengthened to reduce the length of the injector valve proper. Trapped volume is reduced consistently with fuel flow requirements.
    Type: Grant
    Filed: September 20, 1994
    Date of Patent: November 21, 1995
    Assignee: Alfred J. Buescher
    Inventors: Alfred J. Buescher, Frank DeLuca