Abstract: A method and a system are disclosed for the controlled shutting-off of an internal-combustion engine. The engine system includes a fuel injection timing gear, an ignition control, an electric machine in the form of an electric motor and/or generator coupled directly or indirectly with the internal-combustion engine, and another control unit. In order to ensure a controlled shutting-off the control unit is operable to detect a shut-off signal for the internal-combustion engine, to interrupt the fuel injection while the ignition is simultaneously maintained, to maintain a defined rotational engine speed for a defined time or a defined number of crankshaft revolutions by means of the electric machine, and finally to stop the internal-combustion engine by means of the electric machine.

Abstract: An intake passage device is provided for an internal combustion engine having carburetor communicated with a connecting projection of an intake port of a cylinder of the engine, wherein the diameter of the connecting projection becomes smaller toward the inside of the intake port. A connecting pipe is provided for communicating the carburetor with the intake port. An inner end of the connecting pipe is engaged in the connecting projection. There is formed a plurality of one communication passages formed in the connecting pipe for communicating an inside of the connecting pipe with a space between an inside wall of the connecting projection and an outside wall of the connecting pipe.

Abstract: To provide an engine cooling system including a water pump for circulating cooling water in order to cool an engine, and a thermostat provided in the water pump in such a manner as to be openable/closable depending on the temperature of cooling water. The thermostat is provided in the water pump with a reduced number of parts, to thereby reduce the cost, weight and the number of assembling steps. A casing of a water pump is composed of a pump body for rotatably supporting a pump shaft and a pump cover connected to the pump body in such a manner as to cover an impeller fixed to the pump shaft. A thermostat is contained in a containing portion formed in the pump cover in such a manner as to be held between the pump body and the pump cover.

Abstract: A fan assembly (10) which incorporates variable pitched blades (152), is driven by the engine of a vehicle and is used in cooling the engine. A control system (248) is provided which is responsive to at least one signal representative of an operating parameter of the engine and a second signal indicative of a desired cooling requirement to establish an efficient pitch for the blades of the fan assembly. In one embodiment, the speed of the engine is sensed and used in combination with a cooling requirement signal developed by the engine control module (205) to regulate the pitch of the fan assembly. In a second embodiment, engine charge air temperature and coolant temperature signals are utilized in establishing the desired pitch. Furthermore, fuzzy logic controls (290) can be utilized to anticipate the cooling needs of the engine based on variations in the overall dynamic system as derived from information available through the engine control module.

Abstract: The present invention provides a cooling water circulating apparatus capable of securing a required flow rate of cooling water without increasing the heads of water pumps. The apparatus includes a first water pump which has a first supply port for supplying the cooling water into the first water pump, the cooling water for flowing through the interior of an engine, and a first discharge port for discharging the supplied cooling water from the first water pump to the engine again, and which is directly connected to and rotated with a cam shaft of the engine. A control mechanism is adapted to cut off a flow of the cooling water, which is directed from a radiator to the first supply port, when the temperature of the cooling water is not higher than a predetermined level, and operatively connect the radiator and first supply port with each other when the temperature of the cooling water is higher than the predetermined level.

Abstract: A bulkhead is integrally provided in the water jacket provided within the cylinder head of an in-line type four-cylinder engine in the array direction of each cylinder, a cooling water outlet section is provided on the central section in the longitudinal direction of this water outlet side passage, and an outlet to the main body of the water jacket is provided near the bulkhead opposite to that.

Abstract: An exhaust valve for an internal combustion engine including a movable spindle with a valve disc of a nickel-based alloy which also constitutes an annular seat area at the upper surface of the valve disc. The seat area abuts a corresponding seat area on a stationary valve member in the closed position of the valve. At manufacturing, the seat area of the valve disc is subjected to a thermo-mechanical deformation process at a temperature lower than or around the recrystallization temperature of the alloy. The seat area on the upper surface of the valve disc has been given dent mark preventing properties in the form of a yield strength of at least 1000 MPa at a temperature of approximately 20° C. by means of the thermo-mechanical deformation process and possibly a yield strength increasing heat treatment.

Abstract: An oil passage for supplying oil to a nozzle 10 is formed of two communicating bores which are misaligned with one another. The area of overlap between the bores at their intersection is smaller than the cross-section of each of the bores and serves as a flow regulating throttle along the oil passage.

Abstract: The present invention relates to a torsionally compliant sprocket system which absorbs crankshaft torsional vibrations and minimizes their transfer to other components in the engine system. In particular, the present system interposes resilient spring members between a crankshaft sprocket and an adjacent balance shaft drive sprocket which are interconnected. A damping mechanism provides damping of the system to reduce resonant oscillations.

Abstract: A process for controlling a change-over of a rotative direction of a two cycle internal combustion engine used for driving a travelling machine such as a scooter, a snowmobile, a buggy car or the like wherein the rotative direction of the engine is reversed by advancing an ignition position to an over spark advance position just when it is confirmed that reversion allowance conditions are satisfied which are required for reversing the rotative direction of the engine while the travelling machine is driven with safety maintained.

Abstract: A lubricating apparatus for an internal combustion engine incorporating a trap in fluid communication with a low point of the sump of the engine. The trap may house a plurality of meshes having a plurality of sizes for trapping precipitating solids. The trap may be isolated from the sump by a valve for cleaning of the trap and meshes. An auxiliary oil pump may provide a small flow of oil through the trap during periods of engine shutdown.

Abstract: Integrally fastening a cylinder block 6 and a crankcase 7 together by dividing the cylinder block 6 and the crankcase 7 at a dividing surface 31 passing through the center of a crankshaft 15 vertically arranged and screwing a bolt 32 inserted from the crankcase 7 side in the cylinder block 6. The bolt 32 fastening the crankcase 7 to the cylinder block 6 is prevented from interfering with a pair of left and right secondary balancer shafts 37, 38 by supporting both the secondary balancer shafts by the cylinder block 6, but not by the crankcase 7 to increase the degree of freedom of the layout of both the secondary balancer shafts 37, 38.

Abstract: A system (1) for cleaning of intake air (2) for a fan-cooled combustion engine intended for a working tool, such as a chain saw, cutting machine, grasstrimmer or lawn-mower, whose engine is equipped with a fan wheel (3) enclosed in a fan cover (4) for cooling of the engine. A flow duct (5) is connected to the fan cover (4) at least at one of its both ends (6, 7), and a deflection duct (8) is arranged in the wall of the flow duct (5), so that the ducts (5, 8) are forming a T-like crossing, and the deflection duct leads to the engine's inlet duct (9), usually via an inlet volume (10) and a filter (11).

Abstract: A cooled one piece piston for use in an internal combustion engine has a piston body with piston cooling gallery disposed annularly in the piston body and a flange portion extending radially from a supporting portion of the piston body. A piston ring belt portion is connected to the piston body and to the flange portion by welding to provide strength and rigidity, to close off the piston cooling gallery and to define a closed piston cooling gallery. The closed piston cooling gallery has a preselected longitudinal length sufficient to provide a maximum amount of fluid shaking space for improved piston cooling.

Abstract: A water pump includes a pump body and a pump cover. An impeller is housed in a pump chamber defined by the pump body and pump cover. The impeller is attached to one end of a hollow pump shaft. The pump shaft is engaged with a driving section at its other end. An intermediate part of the pump shaft is supported by a shaft support section, in the form of a cylindrical section, of the pump body. The shaft support section is longer than a diameter of the pump shaft. The shaft support section is lubricated via an oil groove. One end of the shaft support section is brought into contact with a flange of the pump shaft via a washer. The flange is integrally formed on the pump shaft by a beading process.

Abstract: The system includes a sensor operable to supply electrical signals indicating the temperature of the engine and further sensors operable to supply electrical signals indicating predetermined parameters established to define operating conditions of the motor vehicle. A processing and control unit is provided to select, on the basis of the signals supplied by the said further sensors, a corresponding predetermined function which correlates the electric power to be supplied to the fan assembly with the electric power to be supplied to the electric pump, in dependence on the heat energy extracted from the engine, in order to obtain the minimum sum of the said electric power values; and to determine, on the basis of the signals supplied by the first sensor and the said selected function, the values of electric power to be supplied to the electric fan and the electric pump.

Abstract: An integral valve stem seal retainer and spring seat for a reduced diameter valve seal subassembly is disclosed having lower and upper portions. An annular sealing member is bonded to the upper portion of the metal retainer and an annular flange extends radially outwardly of the lower portion of the retainer to engage at least one coil of a reduced diameter valve spring. The annular sealing member further includes upper and lower portions, wherein the upper portion engages an outer surface of a valve stem while the lower portion engages a top of a thin-wall valve guide.

Abstract: An electrolysis cell and internal combustion engine kit including an electrolysis cell is disclosed. The cell includes a sealed plastic body having an inlet and an outlet. The plastic body includes a first terminal located at the top of the body, a second terminal located adjacent to the first terminal and insulated conductors associated with each terminal extending through the body and towards the bottom end thereof. Each terminal ends in a respective anode and cathode which are operatively connected to the terminals. The anode and cathode are spaced apart from one another within the body. When an electrolysis solution is placed in the body, and a current provided across the electrodes, water is caused to decompose into hydrogen and oxygen. These combustible gases are then passed into the internal combustion engine to increase the efficiency and power thereof. In one embodiment a reservoir is provided to ensure that the level is maintained in the cell.

Abstract: In an engine block having cylinder cavities arranged close together, a cooling duct is produced in an intermediate wall between the cylinders by pouring the casting material around a mold core made preferably from a material that is soluble in a liquid, combustible and/or brittle, so that the mold core can easily be removed from the duct once the casting has solidified. In the casting mold, the duct mold core is secured solely at its ends so that a cooling duct is formed that is bordered exclusively by a skin of casting material.

Abstract: A gasoline internal combustion engine, including an engine block having a cylinder, fuel intake port and exhaust port therein. A piston is mounted in the cylinder for two-cycle, reciprocating movement therein, and includes an annular piston head and a cylindrical piston skirt, a connecting rod rotatably-mounted by a top end thereof to a piston roller bearing carried on a piston pin of the piston, and by a bottom end of the connecting rod to a crankshaft for outputting power from the reciprocating piston, the crankshaft mounted on a pair of spaced-apart crankshaft roller bearing assemblies, and an array of holes extending through the piston skirt for drawing gasoline from an opposing fuel intake side of the piston to the exhaust side of the piston on the downstroke of the piston to lubricate the exhaust side of the piston and cylinder without the mixture of engine oil with the gasoline.