摘要:
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.
摘要:
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.
摘要:
A device for controlling fuel injection preventing the wasteful consumption of electric power and expanding the dynamic range for controlling the amount of fuel. The device comprises fuel pressure regulator means (4) for adjusting fuel pressure (Pf) of the fuel to be injected, injector drive means (5) including an electromagnetic coil for opening the valve body of the injector (2), and injection control means (1) for controlling the fuel regulator means and the injector drive means depending upon the operating conditions (Ne, Qa and Pf), wherein, the injection control means includes an injection timer (13) for setting the exciting time for controlling the driving time for opening the valve body by controlling the exciting current and the exciting time for the electromagnetic coil, an over-excitation timer (14) for feeding an over-exciting current, and an over-exciting period control unit (15) for variably setting the initial count value of the over-excitation timer depending upon the fuel pressure, and wherein the over-exciting period is variably set to be a minimum required limit that increases with an increase in the fuel pressure.
摘要:
An air fuel mixing portion 5A in an air fuel assist type fuel injection valve comprises an upstream cylindrical portion including an air injection opening and a tapered downstream portion whereby dripping of fuel can be minimized. A spray angle of 30.degree. or less is obtainable, and a rate of change in fuel flow between an air-injection time and a non-air-injection time can be reduced. Further, the relation between the inner diameter D.sub.1 of the cylindrical portion and the smallest diameter of the tapered portion is determined to be D.sub.1
摘要:
An air fuel mixing portion 5A in an air fuel assist type fuel injection valve comprises a cylindrical upstream portion 5a including an air injection opening 3, and a cylindrical downstream portion 5b whereby dripping of fuel can be minimized. A spray angle of 30.degree. or less is obtainable, and a rate of change in fuel flow between an air-injection time and a non-air-injection time can be reduced. Further, the relation between the diameter D.sub.1 of the upstream portion and the diameter D.sub.2 of the downstream portion is determined to be D.sub.1
摘要:
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.
摘要:
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. The pressure-receiving surface area SB of the delivery-pipe-side pressure-receiving portion 150 is greater than the pressure-receiving surface area SA of the housing-side pressure-receiving portion 140.
摘要:
A cutting insert includes an insert body portion and a plurality of projecting portions provided integrally with the insert body portion. The projecting portion includes a cutting edge and includes projecting portion upper and lower surfaces, two projecting portion side surfaces, and a projecting portion side end surface extending therebetween. In the projecting portion, a round corner surface extends between the projecting portion upper surface and the projecting portion side end surface. The cutting edge is formed so as to include a corner formed along an edge of the round corner surface and such that the projecting portion side surface serves as a rake face. The projecting portion is designed such that a length between the two projecting portion side surfaces is smaller than a diameter of an inscribed circle defined on the insert body portion.
摘要:
A current driven D/A converter sets an OFF control voltage (BIAS3) for turning off NMOS transistors M12P, M12N, M22P, M22N, M32P and M32N at a voltage close to an ON control voltage (BIAS2). This makes it possible to reduce the swing of the control voltage (ON control voltage−OFF control voltage) of the NMOS transistors, and hence to reduce the noise due to charge injections through parasitic capacitances, and noise of a ground voltage or power supply voltage due to flowing of discharge currents from the parasitic capacitances to the ground or power supply at turn off of the transistors, thereby being able to offer a high performance current driven D/A converter.
摘要:
A frequency converter for outputting a power to drive a motor, having: an inverter unit for inverting a d.c. power to an a.c. power; a control unit for controlling the inverter unit; and a housing for supporting at least the inverter unit and control unit, wherein a rise time change unit is provided in the housing, the rise time change unit changes a rise time of a waveform of a voltage output from the inverter unit.