Abstract: The fuel injection valve is constructed of a valve body and a single valve needle. The valve needle operates under the pressure of the fuel to move a first distance permitting injection of fuel through the bottom nozzle of the valve body into a combustion chamber and moves a greater distance to expose the remaining nozzles to inject additional fuel into the combustion chamber. The valve needle has a conical end face which sealingly engages a valve seat of the valve body disposed between the respective set of nozzles when in the closed position.

Abstract: An accumulation type fuel injector is provided with an injector body and a needle valve guide having its one end fixed to the injector body. A nozzle body is fixed to the other end of the needle valve guide. The nozzle body is formed with an injection port and with an accumulation chamber. A needle valve is disposed in the accumulation chamber and is guided by the needle valve guide. A valve member is fitted in the injector body, and a check valve is guided by the valve member. A high-pressure fuel supply conduit is in communication with the accumulation chamber such that the needle valve opens when pressure in the fuel conduit is reduced. A controller guided by the valve member opens the check valve at the end of the fuel injection and a control piston guided by the injector body closes the needle valve.

Abstract: An electronically controlled fuel supply system for an internal combustion engine. The timing of the commencement of fuel injection into each combustion chamber is not fixed relative to the rotational position of the camshaft or other engine components. A unit injector assembly associated with each combustion chamber includes a control module and an accumulator type injector module. The control module contains a solenoid valve and, in some embodiments, a hydraulic pressure intensifier. The accumulator type injector module contains an injector nozzle, a hydraulic accumulator, and a non-return valve for admitting liquid fuel under pressure into the accumulator. In operation, an electrical control system supplies an electrical signal to the control module an appreciable portion of the engine cycle in advance of the time when fuel injection is to be initiated in the particular combustion chamber.

Abstract: A fuel injection nozzle of the present invention has an accumulating chamber in a body in which high pressure fuel fed from the fuel injection pump is stored using a non-return valve. A needle valve is arranged in the body to inject the fuel in the accumulating chamber. A nozzle needle of the needle valve and a valve member are arranged coaxially and in series with each other. Those end portions of the nozzle needle and valve member which are adjacent to each other are slidably and liquid-sealingly fitted together to define a damping chamber between the valve member and the nozzle needle. Further, a damping plunger is coaxially fitted into the valve member. A passage which connects the damping chamber with the side of the fuel injection pump is coaxially formed in the damping plunger and has a reduced area.

Abstract: An accumulator injector employs a shuttle piston assembly to produce a pilot injection prior to the primary fuel injection of the injector and to control the injection rate. The shuttle piston communicates with the control chamber and the accumulator chamber of the injector to provide a controllable pressure bleed means for controlling the valve needle lift of the injector.

Abstract: A fuel injector is provided wherein an accumulating chamber is formed around a needle valve in a nozzle assembly housing to open and close an inlet port. An injection end control valve is disposed between the accumulating chamber and a fuel passage having communication with an atmospheric pressure side of the needle valve. The injection end control valve functions to introduce high-pressure fuel from the accumulating chamber into the atmospheric pressure side of the needle valve. Thus, rapid closing of the needle valve is enabled.

Abstract: An electromagnetic unit fuel injector for use in a multi-cylinder diesel engine has an externally actuated pump for intensifying the pressure of fuel delivered to a pressure actuated injection valve controlling flow discharge out through a spray outlet and which is normally biased to a closed position by a spring. Pressurized fuel from the pump is also supplied via a throttling orifice to a modulated pressure servo control chamber having a servo piston means operatively associated with the injection valve.

Abstract: A fuel injection nozzle assembly for the injection of fuel under pressure into a combustion chamber of an internal combustion engine. A nozzle body has formed therein a fuel inlet, a storage chamber and spray orifices for discharging pressurized fuel from the storage chamber. Disposed in the storage chamber is a needle valve for opening and closing the spray orifices and a check valve for admitting a metered amount of pressurized fuel into the storage chamber. The needle valve has formed therein a blind hole in which is slidably mounted a stem extending from a cylindrical section of a check valve and an axial passageway is formed through the stem.

Abstract: A fuel injector of the accumulator type for use in an internal combustion engine which has a primary accumulator chamber and an auxiliary one. These accumulator chambers are connected through check valves with each other. The fuel injector is constructed such that the timing of fuel injection through an injection nozzle can be always kept constant regardless of the quantity of fuel under a high pressure to be supplied into the primary accumulator chamber which varies in response to the load on the engine.

Abstract: An injection valve assembly for spraying fuel into a diesel engine by receiving accurately metered charges of the fuel under pressure from an engine-driven jerk pump. The fuel inlet of the valve assembly communicates via a check valve with a storage chamber, where each incoming charge of pressurized fuel is stored temporarily. The fuel outlet of the valve assembly, in communication with the storage chamber, is normally closed by a spring-biased needle valve member. Upon full accumulation of each fuel charge in the storage chamber the check valve automatically closes the fuel inlet thereby causing the needle valve member to be displaced under the fuel pressure against the bias of the spring and hence to open the fuel outlet. Another embodiment employs two needle valve members, one for the on-off control of communication between the storage chamber and the fuel outlet, and the other for the on-off control of the fuel outlet.

Abstract: A fuel injection apparatus for a diesel engine comprising a holder body having an accumulator chamber and a spring chamber, a nozzle body detachably connected to the holder body, the nozzle body having formed therein a stepped longitudinal bore, a pressure chamber intermediate the stepped longitudinal bore and an injection orifice communicating with the longitudinal bore, a check valve disposed in a passage communicating a fuel injection pump with the accumulator chamber, a solenoid-operated spool valve mounted in the accumulator chamber, a communication passage having an upper end selectively connectible with the accumulator chamber through the spool valve and a lower end being in constant communication with the pressure chamber, a needle valve fitted in the stepped longitudinal bore and movable therein, and a spring accommodated in the spring chamber for biasing the needle valve toward closing the injection orifice.

Abstract: A pump nozzle for an air-compressing injection internal combustion engine with a mechanically actuated pump piston and with an inlet bore connected with the pump working space, through which fuel is fed to a nozzle needle, as well as with a return bore for leakage oil and a control device influencing the fuel delivery; a valve which is actuated in the rhythm of the engine and which with an increasing fuel pressure separates the inlet line from the pump working space is arranged in the flow path of the inlet bore upstream of the pump working space, whereby the closing position of the valve is lifted by opening of a discharge bore leading to the return bore.

Abstract: A fuel injector nozzle includes a housing having a compartment therein divided by a valve seat disc into a control chamber of predetermined volume on one side of the valve seat disc and a fuel chamber on the other side thereof, the valve seat disc having an aperture therethrough to effect communication between the control chamber and the fuel chamber, the housing having an inlet to the fuel chamber and an outlet from the fuel chamber for injection of fuel into an engine cylinder, a check valve in the form of a sleeve movably positioned in the fuel chamber for controlling flow from the control chamber through the aperture in the valve seat disc to the fuel chamber, and an inwardly opening, spring biased injection valve positioned in the fuel chamber with its enlarged diameter stem end guided in the check valve sleeve and having its other end positioned to control fuel injection out through the outlet.

Abstract: A closure is provided for an accumulator. The closure comprises a drain housing, a spring within the drain housing, and hollow cup-like piston within the drain housing, which is urged into an open position by the spring. With the piston in a closed position, the accumulator port is closed and blocks the bladder from entering the drain. The piston has substantially elliptical drain holes in its cylindrical side wall. With the piston in an open condition, the drain holes extend from within the accumulator housing to within the drain housing. The wall which defines the opening of each drain hole, at the portion adjacent to the closed joint of the piston, is canted so that a vector of the forces attributable to liquids leaving the accumulator is directed against the piston to aid in keeping it open. The spring is a coiled spring, so dimensioned as to be proximate the drain housing wall so as to be removed from the flow of the stored substance as it enters and leaves the accumulator.

Abstract: An electromagnetic unit fuel injector for use in a diesel engine includes a pump, in the form of a cam actuated plunger reciprocable in a bushing, to supply fuel at high pressure to a variable volume pressure accumulator chamber and through a flow control orifice to a control chamber in supply flow communication with a fuel injection nozzle assembly having a pressure actuated injection valve controlling the injected charge of fuel from the unit. Flow through the control orifice into the control chamber is selectively controlled by an electromagnetic valve assembly which also selectively controls flow from the control chamber through a drain orifice to a low pressure fuel return or drain line.

Abstract: An electromagnetic unit fuel injector for use in a diesel engine has a pump, provided by a cam actuated plunger reciprocable in a bushing, for intensifying the pressure of fuel delivered to a spring biased closed, pressure actuated injection valve controlling flow discharge out through a spray outlet, to a pressure accumulator and through a throttling orifice passage into one end of a modulation pressure control chamber having an enlarged diameter stem portion of the injection valve therein, the modulation pressure control chamber downstream of the throttling orifice passage being connected by a conduit including a solenoid actuated valve controlling metering orifice with a low pressure fuel drain return line whereby the pressure of fuel in the modulation pressure control chamber acting on the enlarged diameter stem portion of the injection valve is modulated so as to control the seating and unseating of the injection valve.

Abstract: An electromagnetic unit fuel injector for use in a diesel engine has a pump including a cam actuated plunger reciprocable in a bushing for intensifying the pressure of fuel delivered to a pressure actuated injection valve controlling flow discharge out through a spray outlet, to a pressure accumulator and, through a throttling orifice passage into one end of a modulation pressure control chamber having a spring biased piston movable therein, the piston engaging one end of the injection valve, this one end of the pressure control chamber downstream of the throttling orifice passage being connected by a conduit, including a solenoid actuated valve controlling flow through a metering orifice to a low pressure fuel drain return line whereby the pressure of fuel in the pressure control chamber acting on the piston is modulated so as to control the seating and unseating of the injection valve.

Abstract: An accumulator type injection valve of simple construction and relatively large accumulator capacity has opposed inlet and outlet valves for alternately and intermittently communicating a single chamber with an inlet passage for receiving fuel from a pump and an outlet passage in further communication with an injection nozzle, the outlet valve being an inwardly opening needle valve responsive to fluid pressure within the chamber. In order to even further improve operating response of the injection valve, a dump valve relieves fluid pressure from the chamber below a preselected pressure.

Abstract: A dual phase fuel injection nozzle assembly, including primary injection means which operate to provide a fine flow of fuel through an outward-opening check valve assembly and through a relatively small orifice. The assembly also includes secondary injection means which operate as an accumulator type fuel nozzle, utilizing a "non-return" valve to trap the fuel under pressure in an accumulator chamber and an inward-opening valve to control flow from the accumulator chamber through a relatively large orifice. The two phases are correlated with engine operating conditions to provide optimum rates of fuel injection over the entire operating range of a diesel engine.

Abstract: A pressure transfer unit having a movable partition including a flexible bellows for separating an internal, controlled-pressure chamber from a reference-pressure chamber. A valve is provided for limiting the volume of liquid that can be injected into and received in the controlled-pressure chamber during filling or refilling thereof. A spring biases the partition to apply a predetermined force to the partition and to shut off fluid transfer in the event of bellows failure. The unit is arranged for simple and rapid assembly and disassembly.