Abstract: A fuel injection valve includes a valve seat which has a valve seat surface, an injection nozzle having an inclined axis center, and a conically-shaped tapered surface located between the valve seat surface and the injection nozzle; and a valve element for controlling fuel supply to the injection nozzle. One part of an opening of the injection nozzle is connected to the tapered surface; the other part of the opening is connected to the valve seat surface; and a relationship between an angle ?1 formed by the injection nozzle and the tapered surface at an area where the injection nozzle is connected to the tapered surface side, and an angle ?2 formed by the injection nozzle and the valve seat surface at an area where the injection nozzle is connected to the valve seat surface side is configured to be ?1??2.

Abstract: A cylinder injecting fuel injection valve device of the present invention includes: a fuel injection valve including an axially constrained portion formed in an outer periphery of a metal portion so as to protrude radially outwards and a radially constrained portion of a predetermined configuration formed on an outer peripheral surface of a resin portion, and being adapted to inject fuel directly into a cylinder from the fuel injection port; and a retainer one end of which is fixed to the cylinder head and the other end of which has a constraining portion by means of which the fuel injection valve is secured in position, in which the constraining portion of the retainer abuts the axially constrained portion to axially pressurize the fuel injection valve, and is engaged with the radially constrained portion to thereby restrict rotation of the fuel injection valve around an axis.

Abstract: The present invention comprises a housing main body, a valve assembly disposed within the housing main body and provided with a valve main body having a large-diameter cylinder portion and a small-diameter cylinder portion, a valve seat having a fuel injection aperture secured within the valve main body and a needle valve for closing and opening the fuel injection aperture, a seal ring held between a cylinder head and a shoulder portion when the valve assembly is inserted into an insertion port in the cylinder for preventing combustion gas in the cylinder from leaking into the housing main body and a welded joint for securing the valve main body to the housing main body disposed between the side of the large-diameter cylinder portion and an engaging portion on the housing main body.

Abstract: To generate the effective damping relative to the change of fuel pressure when a needle valve is closed and to decrease the generation of after-dripping right after injection (spray), a rubber ring is provided between a core and a sleeve adapted to seal the fuel.

Abstract: There is provided a fuel injection valve in which an operation sound at the time of an operation of the fuel injection valve is lowered, and durability of parts is improved. A flat surface 4a of a valve body 4 is provided at a lower surface side of a shoulder portion 3a provided at a needle valve 3, and when the needle valve 3 moves in a valve closing direction, a portion B in which fuel is confined is compressed at a place between a lower surface of the shoulder portion 3a and the flat surface 4a, so that a damping effect of fluid is obtained and an operation sound is lowered.

Abstract: The fuel injection system includes an injector 7 to be electromagnetically driven, a control device 2 for outputting a drive signal having first current-carrying time T1 and second current-carrying time T2 to this injector 7, and a drive device 6 for passing a large current to open a valve of the injector 7 during the first current-carrying time T1 and passing a small current to hold the injector 7 in a valve opening state during the second current-carrying time T2. The system is constructed so that the first current-carrying time T1 is set to the time shorter than valve opening required time T0 from a current-carrying start of the injector 7 to full opening and this time difference is set to the value shorter than valve closing operation delay time from a current break of the injector 7 in the case of breaking a current in the first current-carrying time T1 to a start of a valve closing operation.

Abstract: Step portions in a core and a valve holder are provided, and an L-shaped sleeve is fitted in these step portions. This construction axially shortens the coextensive portion of the outer circumference of the armature and the inner circumference of the sleeve. The length of the armature is also relatively shortened.

Abstract: There is provided a fuel injection valve in which an operation sound at the time of an operation of the fuel injection valve is lowered, and durability of parts is improved. A flat surface 4a of a valve body 4 is provided at a lower surface side of a should portion 3a provided at a needle valve 3, and when the needle valve 3 moves in a valve closing direction, a portion B in which fuel is confined is compressed at a place between a lower surface of the shoulder portion 3a and the flat surface 4a, so that a damping effect of fluid is obtained and an operation sound is lowered.

Abstract: In a valve main body, there is provided a guide pin having an aligning end portion for aligning with respect to a central axis of a fuel injection path. This guide pin is inserted into the valve main body, and a whirler is inserted into the guide pin, and a valve seat is fixed at one end of the valve main body such that the aligning end of the guide pin is aligned with respect to the central axis of the fuel injection path. The guide pin is then pulled away from the valve main body, and the valve body is inserted into the valve main body so that the section of the valve body to be slid in the whirler can be inserted into the valve body sliding hole.

Abstract: A method of manufacturing a sliding part includes: an injection molding step of injection-molding a compacted member of a molding compound which is a mixture of powder material equivalent to SUS440C, graphite carbon corresponding to an oxygen content of the material, and a binder; a degreasing step of heating the compacted member thus obtained by the injection molding step under a neutral atmospheric condition to remove substantially all of the binder from the compacted member; and a baking step of heating the compacted member which is degreased under a vacuum condition of 0.1333 Pa or less from a room temperature up to 1000° C. to reduce an oxygen content of the compacted member to 0.02% or less by the reaction of C+O→CO, and then heating the compacted member under an argon atmospheric condition of 133.3 to 3999 Pa for two hours after the temperature is increased up to 1250° C.

Abstract: A method for manufacturing a cylinder interior fuel injection valve and an apparatus for adjusting a fuel injection amount used therefor may sufficiently cope with a fluctuation in fuel pressure or combustion gas pressure that would occur in an actual engine. According to this manufacturing method, a position of an adjuster is adjusted (step 110), a fuel injection amount is measured (step 111), and it is judged whether or not the measured value of the fuel injection amount falls within a range of a rated value (step 112). Then, if the fuel injection amount is out of the range of the rated value, the process is returned back to the step 110, and if it falls within the range of the rated value, the process shifts to a subsequent step 113. Subsequently, a spring force of a valve closing spring is measured (step 113), and it is judged whether or not the measured value of the spring force falls within a control range (step 114).

Abstract: A fuel injection valve for the cylinder injection 100 comprising: a valve assembly 3 which injects fuel; a solenoid assembly 26 which opens and closes the valve assembly 3; a housing 102 which accommodates the valve assembly 3 and the solenoid assembly 26; and a core 33 which also functions as a fuel pipe which connects The valve assembly 3 to a delivery pipe 4. The core 33 comprises: a delivery-pipe-side pressure-receiving portion 150 which is disposed within the delivery pipe 4 and is subjected to fuel pressure from within the delivery pipe 4; a housing-side pressure-receiving portion 140 which is connected to the valve assembly 3 within the housing 102 and is subjected to fuel pressure from within the housing 102; and a fastening portion 33d disposed between these two pressurized portions to fasten the core 33 to the housing 102.

Abstract: A cylinder injection type fuel injection valve 1 has a valve body 10 of a hollow cylindrical shape, a valve seat 12 having a fuel injection nozzle 11 at its center, which is disposed at an end of the valve body 10, a hollow housing 2 having an end connected to the valve body, which is capable of coming to contact with and separating from the valve seat 12 so as to open and close the injection nozzle 11, a core 3 disposed in the housing 2 and a coil assembly 4 disposed around the core 3 and inside the housing to cause opening and closing operations of the valve body 10, wherein an O-ring 14 is fitted to a space defined by the housing 2 and the core 3, in which the coil assembly 4 is disposed, at a side to which a fuel pressure is applied, so that the pressure is not applied to the coil assembly, or wherein a sealing ring having a hollow cylindrical shape 17 is fitted to a space defined by the housing 2 and the core 3, in which the coil assembly 4 is disposed, at a side to which a fuel pressure is applied, and

Abstract: A fuel injection valve includes: a valve seat provided at one end of a hollow valve main body and having an injection hole; a valve body separated/contacted from/with the valve seat to open/close the injection hole; and a swirler for surrounding the valve body to slidably support the valve body and for giving swirling to a fuel flowing into the injection hole, the swirler being produced by metal powder injection molding.

Abstract: A cylinder injection type fuel injection valve has a metallic ring 15 of a substantially T-like shape which is disposed inside a solenoid 2 and which has inner and outer sides supported by O-rings 16, 17 in order to seal highly pressurized fuel, whereby a change in a flow rate of fuel, which may be resulted by attaching the fuel injection valve to an internal combustion engine, can be minimized without changing largely a sealing structure for fuel, and deformation of the metallic ring is minimized.