Abstract: A motor includes a stator formed of a stator iron-core having salient pole iron-cores and windings, and a rotor having a rotor iron-core in which permanent magnets are buried. A magnetic pole centerline connecting a rotary center of the rotor to a magnetic pole center crosses an external shape of the rotor iron-core at end point X, and the magnetic-pole boundary line connecting the rotary center to a magnetic pole boundary point crosses the external shape of the rotor iron-core at end point Z. A straight line angled at a given angle ?a from the magnetic pole centerline has end point A. Then a sectional view of the rotor iron-core shows an arc drawn between the end points X and A, and the arc's center is the rotary center. The end points A and Z are connected by one or more than one straight lines in series.

Abstract: A fuel injection device 1A includes a nozzle body 10 equipped with multiple injection apertures 12, a needle valve 20 arranged in the nozzle body, a fuel swirl portion 24 in which fuel FE is swirled along an inner wall surface of the nozzle body, and a guide portion 22 applying swirl force to the fuel and then guiding the fuel to the fuel swirl portion, the fuel swirl portion being arranged at a position at which the fuel swirl portion partially overlaps with the injection apertures. When the needle valve is at a low lift position, the fuel swirl portion overlaps with parts of the injection apertures so that the shape of sprayed fuel can be formed in diffusive spray having a wide spray angle. When the needle valve is at a high lift position, the shape of sprayed fuel can be formed in column-shaped spray having a narrow spray angle.

Abstract: A needle is forced to open an injection hole by reducing a pressure of fuel in an injection control chamber to thereby inject fuel stored in a fuel storage, while the needle is forced to close the injection hole by increasing the pressure of fuel in the injection control chamber to thereby terminate injection of fuel from the injection hole. In a valve-closing stroke of the needle to close the injection hole, fuel pressure is supplied from a common accumulator to the fuel storage and the injection control chamber in such a manner that the pressure to supply fuel to the fuel storage is lower than that to supply fuel to the injection control chamber. In this way, a force acting on the needle toward the injection hole side can be increased in the valve-closing stroke, to thereby accelerate a valve-closing speed of the needle.

Abstract: A pressure boosting unit (110) is provided in each fuel injection valve of an engine (1). A pressure of fuel to be supplied to the fuel injection valve from a common rail (3) is boosted as required. An ECU (20) causes low pressure injection to be performed with the pressure boosting unit 110 being in a non-operated state, and high pressure injection to be performed with the pressure boosting unit (110) being in an operated state, and the pressure of the fuel being maintained at a boosted pressure. Based on the result, the ECU (20) corrects a fuel injection period of the fuel injection valve. Also, after the correction of the fuel injection period is completed, fuel injection is performed before the pressure of the fuel reaches the boosted pressure after the pressure boosting unit starts to be operated. Based on the result, operation starting timing of the pressure boosting unit is adjusted.

Abstract: In a direction control valve, a bottom face of an insertion hole of a first movable member is at a predetermined distance from a second movable member with respect to a first axial direction when communication between a first communication switching port and a communication object port is made and communication between a second communication switching port and the communication object port is broken. The bottom face contacts and pushes the second movable member in a second axial direction opposite to the first axial direction after the first movable member moves in the second axial direction by the predetermined distance while the first and second movable members move in the second axial direction to switch a port communicating with the communication object port from the first communication switching port to the second communication switching port.

Abstract: A fuel injection valve which injects fuel from a nozzle hole includes a cavitation generation flow path in which a cavitation bubble is generated in fuel flowing inside the injection valve, and a bubble storage flow path which is connected to the cavitation generation flow path and the nozzle hole and which stores the cavitation bubble generated in the cavitation generation flow path. A fuel containing the cavitation bubble stored in the bubble storage flow path is injected from the nozzle hole so that atomization of an injected fuel spray is enhanced.

Abstract: In fuel injector including an accumulator and an intensifier, fuel is injected such that an injection control valve and a piston control valve are individually controlled, an operational phase difference therebetween is regulated, and at least one of a maximum injection pressure, a rate of increase of an injection pressure at the start of an increase of pressure, a rate of decrease of the injection pressure at the completion of injection, a pilot injection pressure, and an after injection pressure of fuel injected from a fuel injection nozzle is arbitrarily changed. Namely, a pressure during a movement from a base common rail pressure of the accumulator to a static maximum pressure statically determined by an operation of the intensifier is positively used as a control factor of injection, whereby a fuel injection pattern can be implemented with an extremely high degree of freedom.

Abstract: A fuel injection device is provided which can inject fuel by very high injection pressure and can realize favorable combustion and exhaust characteristics, and moreover, enables performance of fuel injection with arbitrary fuel injection patterns. In the fuel injection device 30, the protrusion 61 is provided at a distal end portion of the piston control valve 60 which is provided at the pressure intensifier 54, can change a practical opening area of the fuel flow path 57 to the cylinder 56 in accordance with movement of the piston control valve 60, and can control inflow amounts of liquid fuel that is flowed into the cylinder 56 by the piston control valve 60 (does orifice control). Thus, control of injection rates and injection pressures of fuel that is injected from the fuel injection nozzle 34 is enabled, and fuel injection patterns can be realized with an extremely high degree of freedom.

Abstract: A fuel injection device is provided which can inject fuel by very high injection pressure and can realize favorable combustion and exhaust characteristics, and moreover, enables performance of fuel injection with arbitrary fuel injection patterns. In the fuel injection device 30, the protrusion 61 is provided at a distal end portion of the piston control valve 60 which is provided at the pressure intensifier 54, can change a practical opening area of the fuel flow path 57 to the cylinder 56 in accordance with movement of the piston control valve 60, and can control inflow amounts of liquid fuel that is flowed into the cylinder 56 by the piston control valve 60 (does orifice control). Thus, control of injection rates and injection pressures of fuel that is injected from the fuel injection nozzle 34 is enabled, and fuel injection patterns can be realized with an extremely high degree of freedom.

Abstract: To obtain a fuel injection method in a fuel injector capable of realizing excellent combustible and exhaustive characteristics, and carrying out fuel injection with an arbitrary fuel injection pattern thus allowing a degree of freedom of a fuel injection pattern to further expand. In an fuel injector comprising an accumulator and an intensifier, fuel is injected such that an injection control valve and a piston control valve are individually controlled, an operational phase difference therebetween is regulated, and at least one of a maximum injection pressure, a rate of increase of an injection pressure at the start of an increase of pressure, a rate of decrease of the injection pressure at the completion of injection, a pilot injection pressure, and an after injection pressure of fuel injected from a fuel injection nozzle is arbitrarily changed.

Abstract: A fuel injector which is enabled to form a fuel spray efficiently and properly into a flat sector shape by improving the angle, dispersion and atomization of the spray and by optimizing the spray tip penetration. A slit-shaped nozzle outlet 4 is constructed such that its transverse walls from its inner end 9 to its outer end 10 have an included angle .gamma. of 20 to 180 degrees, such that an angle .beta. of 0 to 90 degrees is made between the axis of the fuel injector and the opening direction of the slit-shaped nozzle outlet 4, such that the nozzle outlet 4 is diverged outward from a plane joining the axis to the fuel injector and the inner end 9, and such that the opposite portions of the inner end 9 have a width W of 0.05 mm to 0.24 mm. By combining these constructions suitably, the fuel spray can be formed efficiently and properly into a flat sector shape thereby to improve the fuel injection characteristics.

Abstract: An electro-pressure conversion control device comprising a fluid passage formed in a device body, which fluid passage includes a fluid inlet at one end, a throttle, a jetting hole at the other end, and a control pressure taking port provided between said throttle and said jetting hole and a plate which is driven by an electrical actuator in such a manner as to go across the axis of the jetting hole thereby to open and close the jetting hole whereby the jetting hole operates as a variable throttle. The plate is displaced in a direction perpendicular to the axis of the jetting hole by the electrical actuator to control the degree of opening of the jetting hole thereby to control the pressure in the fluid passage between the throttle and the jetting point so as to provide a pressure which varies according to an electrical signal applied to the electrical actuator.

Abstract: A method and device for forming mixture gas for a direct fuel injection type internal combustion engine, which has a piston with a recess forming a combustion space, air intake means with swirling means for switching intake air to be supplied into the combustion chamber, and an intermittent swirl injector nozzle having at least one tangential passage for swirling fuel supplied through fuel supplying means to the combustion chamber, to jet the fuel in conical form to the swirling intake air, to form a mixture gas, and which comprises the steps of supplying swirling intake air into the combustion space, the swirling intake air having a swirl speed in conformance to the speed of the internal combustion engine, and spraying fuel from the swirl injection nozzle onto the swirling intake air in the combustion space at a fuel spray angle varied in response to the engine speed, thereby controlling the spray travel distance of the fuel and allowing the fuel to float in the combustion space without being stuck onto a wa

Abstract: An intermittent swirl type injection valve having a spray angle, capacity coefficient and fuel spray travel distance set so that the valve produces optimum engine operating conditions, with the spray angle, capacity coefficient and fuel spray travel distances being determined taking into account the gap area A.sub.c, the spray hole diameter d.sub.e, and the area A.sub.g of tangential passages in the valve. The injection valve includes a valve body and a valve needle slidably fitted in a valve hole formed in the valve body. A spray hole in the valve body merges with a valve seat provided at an end of the valve hole, and the spray hole is shaped to receive the lower end of the valve needle. Tangential passages swirl the fuel when the needle valve leaves the valve seat to open the valve to spray fuel substantially conically through the spray hole. The injection valve is designed so as to satisfy the following conditions:.alpha.=20.degree. to 75.degree.,d.sub.e =0.3 to 1.2 mm,and ##EQU1## where .alpha.

Abstract: A swirl injection valve includes: a nozzle body including a hollow cylindrical body having a hole and a bottom portion on which a nozzle port and a valve seat are formed; a needle valve member, slidably inserted and reciprocally moved within the hole of the nozzle body, having a tip portion for seating on the valve seat and controlling the opening and closing of the nozzle port; a swirl chamber formed upstream of the nozzle port and defined between an inner wall of the nozzle body and an outer wall of the needle valve member; a fuel supply passage formed within the nozzle body and connected to a fuel supply source; and inclined passage comprising at least one short passage connected to the swirl chamber and the fuel supply passage and tangentially opened to the swirl chamber at a predetermined inclined angle. The fuel is tangentially supplied from the inclined passage to the swirl chamber without pressure loss.

Abstract: A spill type swirl injector includes a nozzle body, an injection port, a pressurized fluid induction passage, a valve assembly, a swirl chamber, two tangential pressurized fluid supply passages and a spill assembly including two spill openings provided on an outer cylindrical wall of a movable member of the valve assembly and opened to inner side of the swirl chamber. An axial hole provided in the movable member of the valve assembly and in the nozzle body and discharge passage assembly is connected to a pressurized fluid supply source, thereby spilling a predetermined quantity of the pressurized fluid from the inner side of the swirl chamber through the spill opening, axial hole and spill passage assembly.

Abstract: An intermittent injection type fuel injection valve including a nozzle body comprising a hollow cylindrical member and having a valve seat and an injection port, valve comprising a movable member having a valve seat interposed into the nozzle body and intermittently reciprocated therein; a compressed air supply passage communicating with a compressed air supply source and having an air opening provided on or near at least one of the valve seats of the nozzle body and movable member; and a compressed fuel supply passage communicating with a compressed fuel supply source and having at least one fuel opening provided on the valve seat of the nozzle body and movable member, the valve intermittently controlling the on-off communication of the air and fuel openings of the compressed air and fuel supply passages, and the fuel opening of the compressed fuel supply passage being positioned closer to the injection port than the air opening of the compressed air supply passage.