In general, the subject matter described in this disclosure can be embodied in a fuel injector that includes an upper housing portion that defines an inlet passage adapted to receive fuel, and a lower housing portion that is attached to the upper housing portion and that defines an injector outlet adapted to dispense fuel. The fuel injector includes an electromagnetic coil assembly that is user removable while the upper housing portion remains attached to the lower housing portion. The fuel injector includes a movable pintle that is biased to a closed position that is adapted to prevent fuel from flowing through the injector outlet, and movable, responsive to magnetic force produced by energizing the electromagnetic coil assembly, to an open position that is adapted to permit fuel to flow through the injector outlet.

A method for hard machining at least one orifice into a heat-treated fuel system component can include mounting the component into a holding fixture. The at least one orifice can include a first orifice. The method can include determining a desired orifice size of the at least one orifice based on a desired flow rate. The method can include hard machining the first orifice into the component. The method can include forming a first portion of the first orifice. The method can include forming, at an end of the first portion, a second portion of the first orifice. A diameter of the second portion can be smaller than a diameter of the first portion. The method can include forming a corner between the first portion and the second portion. The corner can have an edge condition having a dimension of 50 microns or less.

A method of making a fluid injection component for a gas turbine engine includes depositing material onto a piece of tube stock. The method includes machining an elbow into the deposited material, wherein machining the elbow includes forming a braze joint surface in the deposited material. Depositing can include laser cladding the material onto the piece of tube stock.

A workpiece for a fuel injection component is made of a steel having compositions, by mass %, of C: 0.08 to 0.16%, Si: 0.10 to 0.30%, Mn: 1.00 to 2.00%, S: 0.005 to 0.030%, Cu: 0.01 to 0.30%, Ni: 0.40 to 1.50%, Cr: 0.50 to 1.50%, Mo: 0.30 to 0.70%, V: 0.10 to 0.40%, s-Al: 0.001 to 0.100%, and Fe and unavoidable impurities as remaining components. After heating the workpiece to a temperature of 950 C. or more and 1350 C. or less, the workpiece is subjected to a hot forging, and thereafter cooled at an average cooling rate of 0.1 C./sec. or more in a temperature range from 800 C. to 500 C., and at the average cooling rate of 0.02 C./sec. or more and 10 C./sec. or less in the subsequent temperature range from 500 C. to 300 C. to set an area ratio of a bainite structure after hot forging to 85% or more.

An objective of the present invention is to provide a fuel rail that can be used at a high fuel pressure of 50 MPa or more, for example, has good engine mountability, and has improved material yield. The present invention is regarding a fuel rail including a main pipe portion 10 extending in a longitudinal direction and a plurality of distribution pipe portions 20a, 20b, 20c, and 20d branching from the main pipe portion in a cross direction, in a fuel supply system in which a fuel compressed by a fuel pump passes through a fuel passage hole of the fuel rail fixed to an engine trough a bracket or a stay, the fuel is supplied to injectors, and the fuel is injected into the engine, the present invention is to cut and form the main pipe portion 10 and the plurality of distribution pipe portions 20a, 20b, 20c, and 20d from a same single-sheet plate 100, the single-sheet plate being a plane plate or a flat plate having an irregular shape in cross section, and to seamlessly configure a main pipe hole 11, distribution pipe holes 21a, 21b, 21c, and 21d, and injector attaching holes 22a, 22b, 22c, and 22d, without joints.

A coil assembly in a fuel injector includes a magnetic core and; a winding wound around the core, the winding being overmoulded and forming a cylindrical overmoulding. An axial blind hole extends towards the interior of the coil assembly from a first surface to a distal end, the blind hole being suitable for housing at least one spring for loading a magnetic armature. The coil assembly is provided with a degassing hole passing through the core and the overmoulding from the blind axial hole to an axial outer cylindrical surface, the degassing hole being provided in the magnetic core and having a restriction that is arranged in a first section that is proximal to the blind axial hole.

The present application concerns a fuel-injection metering device for a motor vehicle. The fuel-injection device include a main body with at least one through-hole, whereby the main body forms a valve seat on its inner face that is provided to interact with a valve body, whereby the inner face of the main body is electrochemically machined. The application also concerns a mould, a production method, and a fuel-injection nozzle.

A method of making a fluid injection component for a gas turbine engine includes depositing material onto a piece of tube stock. The method includes machining an elbow into the deposited material, wherein machining the elbow includes forming a braze joint surface in the deposited material. Depositing can include laser cladding the material onto the piece of tube stock.

A control device is applied for an internal combustion engine which is provided with a high-pressure fuel pump driven by a driving shaft of the internal combustion engine to discharge a fuel pressurized in a pressurizing chamber, an accumulator accumulating a high-pressure fuel discharged from the high-pressure fuel pump, and a relief valve which is opened when a fuel pressure in the accumulator is higher than a specified pressure in order to return the fuel in the accumulator to a specified chamber where a fuel has lower pressure than a fuel in the pressurizing chamber. An idle speed of the internal combustion engine is increased to a specified speed when the fuel pressure in the accumulator has been higher than a determination pressure, which is lower than the specified pressure, for a first period or longer.

A method for manufacturing an injector for injecting fuel, the injector including: a closing body which is linearly movable in an axial direction and a valve seat element having at least one passage for injecting the fuel, a valve seat with which the closing body is in contact for closing off the at least one passage, and a guide area for guiding the closing body when same is moving in the axial direction, the method being characterized in that the valve seat and the guide area are hard turned.