Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
2005-05-10
2005-05-10
Moulis, Thomas (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S446000, C417S454000, C137S512000
Reexamination Certificate
active
06889662
ABSTRACT:
A fuel pump for use in a fuel injection system includes a housing at least one piston defining a work chamber and drive means which put the piston into a reciprocating motion in the chamber. An inlet conduit and an outlet conduit can be made to communicate with the work chamber. A first valve device is provided between the inlet conduit and the work chamber, and a second valve device is provided between the work chamber and the outlet conduit. The valve element of one valve device has a guide portion, which is received in a guide opening embodied in the valve element of the other valve device, and the circumferential face of the guide portion and/or of the guide opening has at least one recess, by which the contact area between the guide portion and the guide opening is reduced.
REFERENCES:
patent: 4905729 (1990-03-01), Kawamura
patent: 5015160 (1991-05-01), Hlousek et al.
patent: 5176175 (1993-01-01), Farnham et al.
patent: 5584314 (1996-12-01), Bron
patent: 5605449 (1997-02-01), Reed
patent: 5636975 (1997-06-01), Tiffany et al.
patent: 5839414 (1998-11-01), Klinger et al.
Moulis Thomas
Robert & Bosch GmbH
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