Provided is a fuel injection valve capable of improving durability as compared with the conventional case and making the amount of fuel injected uniform as compared with the conventional case. Further, the present invention provides a fuel injection valve capable of injecting fuel with a high fuel pressure as compared with the conventional case and improving the reliability of the product as compared with the conventional case. For this reason, the configuration has a shape relationship in which φB>φC>φD>φE>φF is satisfied where φB represents a hole diameter of a valve body insertion hole 31 consisting of the through hole formed in the central axis of a movable core 30, φC represents an outer diameter of an intermediate portion 22, of a valve body 20, that slides on a valve body insertion hole (through hole) 31, φD represents a diameter of an inner peripheral face 121 of a front end member 12 having an injection hole 11 that slides on a front end side (downstream side) spherical portion 230 of the valve body 20, φE represents an outermost diameter (sphere diameter) of a front end side (downstream side) spherical portion 230 of the valve body 20, and φF represents an outer diameter of a neck 223, the smallest diameter portion, which is located toward the rear end (upstream) relative to the front end side (downstream side) spherical portion 230 of the valve body 20 and located at the intermediate portion 22 of the valve body 20, and a side face of the movable core 30 and the inner peripheral face of the nozzle body 10 are not in contact with each other.

A direct injection fuel injection valve includes a valve casing housing therein a valve member and fitted into an engine main body of an internal combustion engine. The casing includes: a tubular case member; and a valve seat member joined to one end part thereof and having a valve seat and a fuel injection hole. The valve member can be in contact with and detached from the valve seat. The injection hole is opened and closed by cooperation between the valve seat and the valve member. At least part of the valve seat member is exposed to a combustion chamber of the engine main body. Fuel can be injected into the combustion chamber via the injection hole. The valve seat member is formed from a martensitic stainless steel having a PI value of at least 19, containing at least N, and having a C content of no greater than 0.3%.

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.

This fuel injection valve is provided with: a valve seat (15b) and a valve body (27c), which cooperate to open and close a fuel passage; a valve seat member (15) having formed thereon the valve seat (15b) and a guide surface (15c) which guides the valve body (27c); and a cylindrical body (5) having the valve seat member (15) press-fitted in the front end-side end thereof. The valve seat member (15) is configured so that the press-fit section (15f) thereof which is press-fitted in the cylindrical body (5) is provided at a position offset toward the base end of the cylindrical body (5) relative to both the valve seat (15b) and the guide surface (15c) in the direction of the center axis (1x) of the fuel injection valve.

Disclosed is a fuel injection valve in which a movable core and a fixed core are enclosed in a cylindrical body. The cylindrical body has an annular groove formed therein, on an outer circumferential side of a region in which the movable core and the fixed core are opposed to each other, to define a thin portion of small wall thickness. In a cross section taken along a center axis of the fuel injection valve, the thin portion has curved line sections on both end sides thereof in a direction along the center axis such that the curved line sections respectively connect a bottom of the annular groove to side edges of the annular groove by curved lines. The curved line sections are provided over a range of larger dimension, from the respective side edges in the direction along the center axis, than a depth dimension of the annular groove.

In the present invention, two side-section side surfaces and each horizontal passage run along a fuel flow direction and have a linear section, and an end-section side surface formed between the two side-section side surfaces and forming an upstream-side end portion has a curved section connected to the side-section side surfaces and. When a fuel inlet and the horizontal passages are projected onto a plane perpendicular to a valve axial center, a projected line of the linear section of each of the horizontal passages extends to a place intersecting a projected line of the opening edge of the fuel inlet, and the upstream-side end portion of each of the horizontal passages extends toward the inside of the opening edge.

Provided is a fuel injection valve which can be easily processed and can realize sufficient atomization while suppressing spreading of spray. In the fuel injection valve according to the present invention, when a nozzle plate 6 and a first direction 15a-1 in which fuel is sprayed are projected onto a virtual plane perpendicular to a central axis line of the fuel injection valve along an opening and closing valve direction of a valve body and a first orthogonal coordinate system having an X1 passing through a center O1 of the nozzle plate 6 and along the first direction 15a-1 and a Y1 axis passing through the center O1 of the nozzle plate 6 and perpendicular to the X1 axis is virtualized on the virtual plane, an introduction passage 11a-1 is inclined so that a straight line segment 14a-1 connecting between a central point 40a-1 of an upstream side end portion and a center Oa-1 of an inlet opening surface of a fuel injection hole 13a-1 is positioned on the Y1 axis side with respect to a straight line 30a-1 passing through the central point 40a-1 and the center O1 of the nozzle plate 6.

The present disclosure relates to valves. Some embodiments may include solenoid injection valves with a valve body; a valve needle with a needle shaft, an upper retaining element, and a lower retaining element; an electro-magnetic actuator comprising a pole piece and an armature spaced from the pole piece by a first axial gap when de-energized. The armature slides on the valve needle between the upper retaining element and the lower retaining element. The valve may include a calibration spring and a spring element arranged between the armature and the upper retaining element. The armature compresses the spring element and travels at least 50% of the first axial gap before an opening force of the valve assembly becomes larger than a total needle closing force. An opening force for displacing the valve needle away from the closing position is transferred from the armature to the valve needle completely through the spring element and a second axial gap between the armature and the upper retaining element is maintained throughout the operation of the valve assembly.

The present disclosure relates to a nozzle body for a fuel injection valve, the nozzle body including a cavity and an injection channel for dispensing fuel from the cavity. The injection channel includes a first section and a second section downstream of the first section, the first and second sections having a common interface. The first section extends from a fuel inlet opening to a second opening disposed at the common interface. The cross-sectional area of the first section monotonically decreases from the fuel inlet opening to the common interface. The cross-sectional area of the second section monotonically increases from the common interface to the fuel outlet opening.

An injection hole body has multiple injection holes for injecting fuel. A valve body is unseated from and seated on a seating surface of the injection hole body. The injection hole body and the valve body form a specific space therebetween to communicate with inflow ports of the injection holes. A virtual region is surrounded by multiple straight lines. The straight lines connect portions of peripheral edges of the inflow ports, which are closest to a center axis of the valve body in the radial direction. A center volume is formed by extending the virtual region from the injection hole body toward the valve body along the center axis. A total injection hole volume is a total volume of the injection holes. The total injection hole volume is larger than the center volume in a state where the valve body is seated on the seating surface.