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US 11,591,995 B2Granted
Fuel injector having valve seat orifice plate with valve seat and drain and re-pressurization orifices
AssigneeCaterpillar Inc.
InventorsCory Andrew Brown, Matthew Robert Vanderveen, Andrew Justin Wallis, Michael Curtis Herr, Dana Ray Coldren
Life of this patent
Estimating the term…
Abstract
A fuel injector includes an injector housing, an outlet check, an injection control valve assembly, and a valve seat orifice plate integrating a valve seat and various orifices for outlet check control. In the valve seat orifice plate a drain orifice extends between a valve seat surface and a check control chamber formed between a closing hydraulic surface of the outlet check and the valve seat orifice plate. First and second re-pressurization orifices extend between an outer surface of the valve seat orifice plate and the check control chamber.
Claims19
A fuel injector comprising:
- an injector housing defining a longitudinal axis and having formed therein a fuel inlet, a fuel drain outlet, a nozzle cavity fluidly connected to the fuel inlet, and a plurality of nozzle outlets;
- an outlet check movable from a closed position blocking the plurality of nozzle outlets from the nozzle cavity, to an open position, and having a closing hydraulic surface;
- a valve seat orifice plate including a first axial side having a valve seat surface, a second axial side, and an outer surface axially between the first axial side and the second axial side and exposed to a fluid pressure of the fuel inlet;
- the valve seat orifice plate further including a drain orifice extending between the valve seat surface and a check control chamber defined in part by each of the closing hydraulic surface and the second axial side, and a first re-pressurization orifice and a second re-pressurization orifice each opening in the outer surface and extending between the outer surface and the check control chamber;
- and
- an injection control valve assembly including an electrical actuator, an armature, and an injection control valve movable from a closed position in contact with the valve seat surface, to an open position fluidly connecting the drain orifice to the fuel drain outlet;
- wherein the first re-pressurization orifice includes an inlet end formed in the outer surface, and an outlet end formed in the second axial side, and the second re-pressurization orifice includes an inlet end formed in the outer surface, and an outlet end directly fluidly connected to the drain orifice.
4 more elements
A fuel injector comprising:
- an injector housing defining a longitudinal axis and having formed therein a fuel inlet, a fuel drain outlet, and a plurality of nozzle outlets;
- an outlet check movable from a closed position blocking the plurality of nozzle outlets, to an open position, and having a closing hydraulic surface;
- an injection control valve assembly;
- and
- a valve seat orifice plate including a first axial side having a valve seat surface, a second axial side, and an outer surface axially between the first axial side and the second axial side;
- the valve seat surface is in contact with an injection control valve of the injection control valve assembly, and the outlet check includes a closing hydraulic surface facing the second axial side;
- the valve seat orifice plate further including a drain orifice extending between the valve seat surface and a check control chamber defined in part by each of the closing hydraulic surface and the second axial side;
- and
- the valve seat orifice plate further including a first re-pressurization orifice and a second re-pressurization orifice each extending from an inlet end formed in the outer surface to an outlet end fluidly connected to the check control chamber.
6 more elements
A fuel injector comprising:
- an injector housing defining a longitudinal axis and having formed therein a fuel inlet, a fuel drain outlet, and a plurality of nozzle outlets;
- an outlet check movable from a closed position blocking the plurality of nozzle outlets, to an open position, and having a closing hydraulic surface;
- an injection control valve assembly;
- and
- a valve seat orifice plate including a first axial side having a valve seat surface, a second axial side, and an outer surface axially between the first axial side and the second axial side;
- the valve seat orifice plate further including a drain orifice extending between the valve seat surface and a check control chamber defined in part by each of the closing hydraulic surface and the second axial side;
- and
- the valve seat orifice plate further including a first re-pressurization orifice formed therein and fluidly connecting to the check control chamber at a radially inward location, and a second re-pressurization orifice formed therein and fluidly connecting to the check control chamber at a radially outward location;
- wherein the first re-pressurization orifice includes an inlet end formed in the outer surface, and an outlet end formed in the second axial side, and the second re-pressurization orifice includes an inlet end formed in the outer surface, and an outlet end directly fluidly connected to the drain orifice.
6 more elements
Dependencies are inferred from the claim text.