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US 7,188,788 B2Granted
Common rail injector with active needle closing device
AssigneeSiemens VDO Automotive Corporation
InventorUlrich Augustin
Life of this patent
Estimating the term…
Abstract
A fuel injector includes a needle valve having a metering land that corresponds with the metering edge to define a metering gap. The metering gap produces a pressure drop utilized to tailor needle valve opening and closing response times.
Claims5
A fuel injector assembly comprising:
- a housing defining a bore including an inlet and an outlet;
- a needle valve movable between an open position that provides for fuel flow through the outlet, and a closed position preventing fuel flow through the outlet, the needle valve including an upper portion and a lower portion, where the upper portion includes a diameter smaller than the lower portion;
- a valve for controlling movement of the needle valve by selectively controlling a pressure differential between the upper portion of the needle valve and the lower portion of the needle valve;
- a sleeve disposed over the needle valve defining a metering land selectively overlapping a metering bore to define a flow passage that creates a desired pressure differential between an upper surface of the metering land and a lower surface that generates a hydraulic bias on the needle valve toward the closed position;
- and
- a spacer disposed below the metering sleeve for aligning the sleeve with a metering edge defined by the metering bore.
3 more elements
A fuel injector assembly comprising:
- a housing defining a bore including an inlet and an outlet;
- a needle valve movable between an open position that provides for fuel flow through the outlet, and a closed position preventing fuel flow through the outlet, the needle valve including an upper portion and a lower portion;
- a valve for controlling movement of the needle valve by selectively controlling a pressure differential between the upper portion of the needle valve and the lower portion of the needle valve;
- a sleeve disposed over the needle valve defining a metering land selectively overlapping a metering bore to define a flow passage that creates a desire pressure differential between an upper surface of the metering land an a lower surface that generates a hydraulic bias on the needle valve toward the closed position;
- a biasing member that biases the needle valve toward the closed position;
- and
- a spacer supported on the sleeve for supporting one end of the biasing member.
4 more elements
Dependencies are inferred from the claim text.