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US 8,262,376 B2Granted
High-pressure pump
AssigneeDenso Corporation
InventorHiroshi Inoue
Life of this patent
Estimating the term…
Abstract
An extended passage of a press-side passage is supposed in a fuel gallery. This supposed extended passage of the press-side passage extends toward a lid member. The press-side passage is opened at the side wall of the fuel gallery. A center axis of the press-side passage is inclined in such a manner that a fuel returning from the press-side passage to the fuel gallery flows toward the lid member. A bottom-side fringe of a damper unit does not exist in the supposed extended passage.
Claims5
A high-pressure pump comprising:
- a press-side passage fluidly connecting a fuel gallery which has a fuel inlet at a bottom thereof and a compression chamber in which fuel is compressed;
- a plunger for varying a volume of the compression chamber and defining a variable volume chamber of which a volume thereof is varied along with a variation in the volume of the compression chamber;
- a volume-chamber passage fluidly connecting the variable volume chamber and the fuel gallery;
- a damper unit provided in the fuel gallery for restricting a variation in a fuel pressure in the fuel gallery;
- and
- a lid member for closing the fuel gallery while biasing the damper unit through an elastic member;
- wherein
- the press-side passage is configured in such a manner that a main stream of a fuel flow, which is returned from the compression chamber to the fuel gallery by the plunger, flows toward the lid member which is opposed to the fuel inlet,
- the press-side passage is configured such that a supposed extended passage thereof extends to the lid member in the fuel gallery, and
- a bottom-side fringe of the damper unit is positioned outside of the supposed extended passage of the press-side passage.
7 more elements
Dependencies are inferred from the claim text.