Abstract: Sticking of carbon deposit to a passage portion between a seat portion and an injection port is reduced. An injection port 13 for injecting a fuel that is arranged to face a combustion chamber of an internal combustion engine. A seat portion H where a valve element 8 comes in contact with a face of a valve seat 11 to intermit fuel injection is arranged at a place upstream the injection port 13. The valve element 8 is conical at a portion downstream the seat portion H to an inlet of the injection port 13. Sectional area of passage between the valve element 8 and the face of the valve seat 11 at the time of fully opening the valve element 8 is arranged so that sectional area of passage downstream the vicinity of the seat portion H is larger. A tapered face 17 having a bore not more than 1/2.5 of inner diameter of a swirl chamber 16 of a swirler 10 is formed on the valve seat 11 face downstream the seat portion H.

Abstract: A fuel injection valve includes an orifice plate having a plurality of discharge orifices formed therein. A valve seat is disposed upstream of the discharge orifices and has a cylindrical fuel passage formed therein. A fuel cavity is formed between the cylindrical fuel passage and the orifice plate directly above the discharge orifices. A valve member is supported for reciprocating movement into and out of contact with the valve seat.

Abstract: A fuel injection system capable of improving the degree of atomization and the combustibility of a fuel, including a fuel swirler, a valve seat having a fuel injection port, an annular fuel swirl chamber formed between the fuel swirler and a valve seat and communicating with plural swirl grooves and a fuel injection port, and a valve body adapted to be moved forward and backward in the interior of the fuel swirler in the axial direction thereof and thereby disengaged from and engaged with the valve seat to open and close a communication passage between the fuel swirl chamber and fuel injection port. Let S1, S2 and S3 equal a minimum cross-sectional area of an opening between the valve body and valve seat in the condition in which the communication passage is fully opened, an area of a cross section of the fuel injection port which is perpendicular to the axis thereof, and an average cross-sectional area of a fuel flow in the fuel injection port, respectively.

Abstract: A cylinder injecting fuel injection valve including a seal gasket sealing at least first two of three regions defined between the shoulder portion of the fuel injection valve main body, the shoulder portion of the cylinder head and an outer circumferential portion of the fuel injection valve main body. The gasket comprises an annular metallic elastic member and an annular support member elastically supporting the metallic elastic member. The gasket abuts at an abutting surface against the shoulder portion of the cylinder head at an axial position closer to the combustion chamber of the internal combustion engine than an upstream side end surface of the swirler member.

Abstract: A device for controlling fuel injection preventing the wasteful consumption of electric power and expanding the dynamic range for controlling the amount of fuel.

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: An in-cylinder fuel injection valve which can realize perfectly hollow conical spray with the minimum amount of center spray. When the outer diameter of a portion of a valve supported by a turning body in such a manner that it can move in an axial direction is represented by D1, the inner diameter of a center hole is represented by D2 and the outer diameter of an inner annular groove is represented by D3, 2×(D2−D1)<D3−D1, and the total of the volume of a space surrounded by a valve seat, the turning body and the valve when the valve is closed and the volume of the inner annular groove is set to 0.25 mm3 or less.

Abstract: A valve-closure member has an outer straight portion or an outer cylindrical portion confronted respective groove outlets of a swirler at a length of not less than ⅓ of the groove depth of the grooves when the valve is fully opened, or at a length of not less than {fraction (1/10)} of the groove depth when the valve is totally closed.

Abstract: A fuel injection valve having an adapter 50 molded from resin and mounted to an extreme end of an injection valve main body 1; a plurality of air/fuel mixing passages 51 formed in the adapter 50 at equal pitches about a first center line drawn axially through the fuel injection valve, having passage centers defined from cross-sectional areas of the air/fuel mixing passages 51 which provide second center lines through each of the passage centers; the second center lines intersect at one point on the first center line, the intersection point being positioned on an upper stream side of the adapter 50, each of the passages 51 being disposed at a same angle of inclination with respect to the first center line; air passages 52, formed in the adapter 50 which communicate with the air/fuel mixing passages 51 to introduce air into the passages 51; a plate 24, disposed between the injection valve main body 1 and the adapter 50; and orifice holes 24a, formed in the plate 24 to confront openings of the plurality of air/f

Abstract: A cylinder injection type fuel injection valve comprising a valve body of a cylindrical type, a valve seat having an injection nozzle for injecting fuel at the center thereof, a valve capable of abutting on and separating from the valve seat to open and close the injection nozzle, a hollow housing connected to the valve body at one end, a solenoid located in the inside of the housing for operating the valve to be opened and closed, and a core which is connected to the housing at one end to form a magnetic circuit in association with the housing, wherein the connecting portion between the housing and the core is encirclingly welded, whereby connecting strength of the connecting portion between the core and the housing is improved, a change in properties under high combustion pressure can be prevented, and capability of withstanding pressure is improved.

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: An improved fuel injection valve for improving the flow of fuel includes a vortex forming member and a needle valve having a planar surface on its leading end. A valve seat has a fuel injection nozzle formed therein and the needle valve opens and closes the fuel injection nozzle by engaging and disengaging with the valve seat. The vortex forming member provides a vortex motion to the fuel entering the fuel injection nozzle, upstream of a seat portion. The flat portion reduces the amount of surface area in which particles may adhere, thus preventing particles from adhering to the needle valve and reducing interference with the flow of fuel.

Abstract: A seal ring to be disposed between two surfaces to sealingly isolate a clearance therebetween into radially inner and outer portions, the seal ring (45) comprisinig a first ridge portion (51) extending through the entire circumference on the first side (46) for sealingly contacting the first surface at a first radial position, and a second ridge portion (52) extending through the entire circumference on the second side for sealingly contacting the second surface at a second radial position different from the first radial position. The seal ring may a generally wave-shaped or S-shaped cross section or include a soft material layer on its surface. The seal ring (65) may also comprise a projection (62) extending from the inner circumference surface of the seal ring in substantially radially inner direction for elastically engaging with a member disposed in the innter circumferential portion of the seal ring.

Abstract: A cylinder injection type fuel injection valve comprising: a valve body of a cylindrical type; a valve seat having at the center thereof an injection nozzle for injecting fuel; a valve capable of contacting to and separating from the valve seat to open and closing the injection nozzle; a swirler having a substantially cylindrical shape which causes a swirl motion in the fuel flowing into the injection nozzle of the valve seat, and which is located around the valve to support the valve so that the valve is slidably moved therein; a hollow housing having one end connected to the valve body and the other end connectable to a fuel supply tube; and a solenoid located in the inside of the housing to operate the valve to be opened and closed, wherein a clearance between the inner diameter of the swirler and the outer diameter of the valve is set to be a half or less of a lifting distance of the valve, whereby a deviation between the valve seat and the valve at a time of a valve-opening state is controlled to be a ha

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.

Abstract: A fuel injection valve comprisesa valve unit 3 which includes a hollow valve body 9, a valve seat 11 provided at an end of the valve body and having an injection nozzle 10, a valve 12 movable in the valve body to come into contact with and separate from the valve seat 11 so that the injection nozzle 10 is opened and closed, anda swirler 13 which is arranged around the valve 12 to support the same in a slidable manner and which provides a swirling force to fuel flowing through the injection nozzle 10, wherein the swirler 13 has outer circumferential surface portions 19a which are in contact with an inner circumference of the valve body 9 to regulate the position with respect to the valve body 9; flow passage portions formed between adjacent outer circumferential surface portions 19a to define fuel passages for passing fuel in the axial direction, and swirling grooves 25 formed in the end surface which faces the valve seat 11 in the axial direction so as to be at an eccentric position with respect to the center

Abstract: A direct injection fuel injection valve includes a valve assembly 6, a hollow housing 14 having a coupling portion 16 coupled to the valve assembly and adapted to be connected to the fuel supply pipe 5, and a solenoid assembly 22 disposed for operating the valve assembly. The housing has an abutting surface 36 disposed at a position radially outward of the coupling portion with respect to the valve assembly and in an opposing relationship relative to a shoulder portion 3 of the fuel injection valve insertion hole 2, and a mounting surface 31 for positioning the housing relative to the cylinder head. A sleeve 40 is provided with one end disposed on the valve assembly in opposition to the shoulder portion of the cylinder head and the other end mounted to the housing in abutment against the abutting surface to bridge across the valve assembly and the housing over the coupling portion.

Abstract: An idling speed control valve for an internal combustion engine is disposed bypassing a throttle valve arranged at an intake passage of the engine, and proportionally controls the quantity of air flowing in the bypass passage based on an output of an electronic control unit including an idling revolution number control function. The valve is controlled by an electromagnetic coil of a solenoid device, and the coil is made of a brass series alloy wire material.