Abstract: A device for controlling a working arm of a working machine, which is capable of releasing the pressure of the actuation fluid confined in the actuation cylinder of the working arm device at a predetermined pressure lower than the set pressure and of controlling the opening/closing of the cylinder relief valve. The device comprises releasing means for a releasing a pressurized fluid feed/drain circuit of an actuation cylinder of a working arm device at a predetermined pressure lower than a set pressure of a cylinder relief valve provided for said feed/drain circuit and a control means for controlling the opening/closing of the releasing means.

Abstract: The fuel injection nozzle according to the present invention comprises a nozzle body provided with nozzle holes, a needle valve that opens and closes the nozzle holes, an armature that is mechanically linked with the needle valve and a stator that faces opposite the armature, so that, by displacing the stator with a micromotor, the lift quantity of the needle valve can be adjusted. In addition, a cover member that rotates slidably around the circumference of the nozzle body is provided and by causing this cover member to rotate with a micromotor, the opening area of the nozzle hole contributing to injection is varied. With these structural features, it becomes possible to intentionally achieve a desired injection pattern.

Abstract: A flowmeter which obtains the flow rate of a fluid by detecting the rotational speed of an impeller is provided with a transmitter for transmitting a laser beam or ultrasonic wave to the tip end of the rotating impeller, a receiver for capturing the laser beam or ultrasonic wave reflected by the impeller, and a data processing unit for calculating the difference between the frequency of signals captured by the receiver and the frequency of signals transmitted by the transmitter and for calculating the rotational speed of the impeller based on the calculated values.

Abstract: A plurality of injection holes are circumferentially arranged in the peripheral wall of the hole at predetermined intervals and at axially different circumferential levels in the leading end portion of the nozzle body to introduce pressurized fuel, and the injection holes at each circumferential level are set different in diameter. On the other hand, a rotary valve has a plurality of fuel guide holes each corresponding to the injection holes at the respective circumferential levels. The fuel guide holes of the rotary valve and the injection holes of the nozzle body are arranged in such a relationship that while the fuel guide holes at one or more than one circumferential level are each made to communicate with the fuel guide holes at one or more than one corresponding circumferential level, the fuel guide holes at the other circumferential levels are not allowed to communicate with any injection holes.

Abstract: A nozzle is provided wherein the operation of injection hole groups is switched from one to another in accordance with the axial displacement of a spool valve. A nozzle body has a bottomed hole, and a plurality of injection hole groups are provided at different circumferential levels in the side wall of the bottomed hole, the injection holes at different circumferential levels being different in diameter from each other. The valve portion of the spool valve is urged by a spring so that the lower end of the valve portion abuts against the base of the bottomed hole in the normal condition. Moreover, a fuel passage communicates with one of the injection hole groups in the normal condition and communicates with the other injection hole group at a position where the valve portion is displaced axially against the spring force on receiving the pressure of pressurized fuel.

Abstract: An electronically controlled fuel injection pump includes a control unit mounted on a pump body and having an internal cooling passage through which a fuel oil flows to cool electronic components of the control unit. On a wall or surface defining part of the cooling passage, there are disposed elongate ribs for preventing the fuel oil from lying stagnant in the cooling passage.

Abstract: A distributor-type fuel injection pump of the type including a magnetic valve disposed on the head portion of a pump body, wherein a pair of oil seals is disposed on opposite sides of the feed pump, and a bypass passage bypasses the cam chamber and connects a discharge side of the feed pump and an inlet side of the magnetic valve. With this construction, the fuel is delivered without passing through the cam chamber. On the other hand, the lubrication oil is introduced into the cam chamber through clearances between the drive shaft and the bearings and through passageways defined in the drive shaft. The cam assembly or other movable components are lubricated exclusively with the lubrication oil, so that the fuel injection pump operates stably over an extended period of time.

Abstract: A unit injector for an internal combustion engine has a solenoid valve for closing a fuel overflow passage to determine the injection timing and the injection quantity. A pumping plunger has its outer peripheral surface formed with first and second longitudinal slits both communicating with the plunger chamber, and a circumferentially extending suction slit communicating with the first longitudinal slit and registrable with a fuel intake passage when the plunger is in an extreme position remote from the plunger chamber. The plunger can assume selectively a normal operating position, a starting position, and an emergency stopping position, at respective different circumferential positions thereof. In the normal operating position, the plunger chamber communicates with the fuel intake passage through alignment of the first longitudinal slit or the suction slit with the fuel intake passage, and also communicated and with the fuel overflow passage via the second longitudinal slit.

Abstract: A fuel injection apparatus comprises a first storing device for temporarily storing cut-off fuel drained after the termination of a fuel injection, a second storing device of changeable volume for temporarily storing fuel for intake, the second storing device having a movable member which is movable in response to the quantity of fuel introduced therein, a detector for producing a detection signal showing an actural position of the movable member and a clamping device responsive to an electric signal for clamping the movable member. The clamping device is actuated to clamp the movable member in response to the detection signal when the desired amount of fuel is stored therein. The adjusted quantity of fuel stored in the second storing device is supplied to a high pressure chamber together with the cut-off fuel stored in the first storing device during the next fuel intake stroke of a fuel injection pump. As a result, extremely high accuracy control of fuel quantity can be realized.

Abstract: A suction space is disposed to selectively communicate with a pump working chamber defined at one end of a plunger via a first communication passageway in which a solenoid valve is arranged, or with suction ports formed in the plunger and communicating with the pump working chamber via a second communication passageway having a restriction therein. The solenoid valve alternately opens and closes for ordinary fuel injection during operation of the engine other than at the start thereof. A selector valve keeps the first communication passageway closed and simultaneously keeps the second communication passageway opened for fuel injection through collaboration of the suction ports with the second communication passageway, in place of the alternate opening and closing of the solenoid valve.

Abstract: A pair of cut-off ports are formed in a plunger and a plunger barrel at a predetermined axial location and registrable with each other to spill pressurized fuel into a zone under lower pressure. A communication passageway communicates a pump working chamber defined by the plunger at one end thereof with the zone under lower pressure. A solenoid valve is arranged across the communication passageway for blocking same. Control means controls the solenoid valve to cause same to selectively assume an open position and a closed position. While the plunger moves toward the pump working chamber, the solenoid valve is closed by the control means to start injection of fuel present in the pump working chamber, and upon registration of the cut-off ports with each other, the fuel injection is terminated.

Abstract: The present invention is directed to a fuel injection apparatus for injecting fuel into diesel engine cylinders, comprising multi-type plunger pumping units for pressurizing a fuel to be supplied from a fuel tank into the cylinders of a diesel engine, an accumulation for accumulating therein the fuel pressurized by the multi-type plunger pumping units, a fuel flow control valve for successively distributing the pressurized fuel toward the cylinders of the diesel engine, and fuel injection nozzles, each being disposed adjacent to one of the diesel engine cylinders for injecting the pressurized fuel distributed by the fuel control valve into the adjacent cylinder of the diesel engine.