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US 5,397,055 AGranted
Fuel injector system
OwnerMarius A. Paul, Ana Paulinventors
Life of this patent
Estimating the term…
Abstract
A high pressure fuel injector having high pressure fuel admission passages and low pressure fuel return passages with a needle valve hydraulically operated by high pressure fuel from the high pressure fuel admission passage by a distributor valve which selectively directs a hydraulic pressure fuel against one side or the other of a piston body forming part of the needle valve whereby the needle valve is urged to a position closing discharge orifices or position opening discharge orifices the distributor valve being controlled by an electronic actuator.
Claims10
A high pressure fuel injector for internal combustion engines comprising:
- a fuel injector body having a high pressure fuel admission passage and a low pressure fuel return passage;
- a discharge nozzle connected to the injector body having a plenum and at least one fuel discharge orifice in communication with the plenum;
- a displaceable valve needle having a needle tip and a piston body with a front end from which the needle tip projects and a back end, wherein the injector body has a valve needle bore and the piston body of the valve needle is slidable in the valve needle bore, with the back end of the needle valve and the valve needle bore forming a hydraulic chamber, wherein the discharge nozzle has a seat contactable by the needle tip in a position blocking the discharge orifice from communication with the plenum and, wherein the needle has spring bias means for biasing the valve needle in a direction that urges the needle tip to the blocking position;
- a displaceable distributor valve wherein the injector body has a distributor valve bore and the distributor valve is slidable in the distributor valve bore;
- and,
- means for reversibly displacing the distributor valve to a first position, wherein the high pressure fuel admission passage communicates with the plenum and discharge orifice on hydraulic displacement of the needle valve, and, a second position wherein the high pressure fuel admission passage communicates with the hydraulic chamber and with the assistance of the spring bias means urges the needle valve tip against the nozzle seat blocking the discharge orifice, wherein in the first position of the distributor valve, the low pressure fuel passage communicates with the hydraulic chamber, and, in the second position of the distributor valve, the low pressure fuel passage communicates with the plenum.
3 more elements
A high pressure fuel injector for internal combustion engines comprising:
- a fuel injector body having a high pressure fuel return passage;
- a discharge nozzle connected to the injector body having a plenum and at least one fuel discharge orifice in communication with the plenum;
- a displaceable valve needle having a needle tip and a piston body with a front end from which the needle tip projects and a back end, wherein the injector body has a valve needle bore and the piston body of the valve needle is slidable in the valve needle bore, with the back end of the valve needle and the valve needle bore forming a hydraulic chamber, and, wherein the discharge nozzle has a seat contactable by the needle tip in a position blocking the discharge orifice from communication with the plenum;
- a displaceable distributor valve wherein the injector body has a distributor valve bore and the distributor valve is slidable in the distributor valve bore;
- means for reversibly displacing the distributor valve to a first position, wherein the high pressure fuel admission passage communicates with the plenum and discharge orifice on hydraulic displacement of the needle valve, and, a second position wherein the high pressure fuel admission passage communicates with the hydraulic chamber and urges the needle valve tip against the nozzle seat blocking the discharge orifice;
- and
- high pressure hydraulic lines wherein the displaceable distributor valve and the means for reversibly displacing the distributor valve are embodied in a distributor component connected to the discharge nozzle and the displaceable valve needle by the high pressure hydraulic lines, wherein the discharge nozzle and the displaceable valve needle are incorporated into a nozzle body, wherein the piston body of the valve needle includes multiple bypass channels and the discharge nozzle includes multiple fuel supply passages which communicate with the plenum on alignment of the supply passages with the bypass channels.
4 more elements
A high pressure fuel injector for internal combustion engines comprising:
- a fuel injector body having a high pressure fuel admission passage and a low pressure fuel return passage;
- a discharge nozzle connected to the injector body having a plenum and at least one fuel discharge orifice in communication with the plenum;
- a displaceable valve needle having a needle tip and a piston body with a front end from which the needle tip projects and a back end, wherein the injector body has a valve needle bore and the piston body of the valve needle is slidable in the valve needle bore, with the back end of the needle valve and the valve needle bore forming a hydraulic chamber, wherein the discharge nozzle has a seat contactable by the needle tip in a position blocking the discharge orifice from communication with the plenum and, wherein the valve needle has spring bias means for biasing the valve needle in a direction that urges the needle tip to the blocking position;
- a displaceable distributor valve wherein the injector body has a distributor valve bore and the distributor valve is slidable in the distributor valve bore;
- means for reversible displacing the distributor valve to a first position, wherein the high pressure fuel admission passage communicates with the plenum and discharge orifice on hydraulic displacement of the needle valve, and, a second position wherein the high pressure fuel admission passage communicates with the hydraulic chamber and with the assistance of the spring bias means urges the needle valve tip against the nozzle seat blocking the discharge orifice;
- and
- high pressure hydraulic lines wherein the displaceable distributor valve and the means for reversibly displacing the distributor valve are embodied in a distributor component connected to the discharge nozzle and the displaceable valve needle by the high pressure hydraulic lines.
4 more elements
Dependencies are inferred from the claim text.