Abstract: A cylinder head of an internal combustion engine is formed with concavity. Two flat protruded portions are formed on the spherical surface of the concavity and their planes intersect each other at a location slightly below the vertex of the spherical surface. At the two flat protruded portions, intake and exhaust valve seats are disposed. A combustion chamber is defined by the spherical surface, the surfaces of the flat protruded portions and the piston crown.

Abstract: This device pertains to an automatically adjustable length connecting rod, as applied to each cylinder of an internal combustion engine designed to operate at variable speed and torque outputs.The purpose of the adjustable length connecting rod is to substantially maintain the level of compression of the fuel mixture over a wide range of speed and torque requirements by means of varying the compression ratio.Automatic adjustment and locking of the length of the connecting rod is accomplished by means of a hydraulic cylinder within the connecting rod. Pressure is applied during a suitable portion of the intake stroke to lengthen the connecting rod. Compression stroke pressure buildup overcomes a relief valve during a suitable portion of the compression stroke to adjust the length of the connecting rod. The connecting rod length is hydraulically locked except during the two short periods of adjustment per cycle.

Abstract: A gaseous fuel is used in a precombustion chamber for igniting lean fuel-oxidant mixtures in a main combustion chamber of an internal combustion engine.The precombustion chamber preferably utilizes a highly combustible gaseous fuel which burns clean with little or no deposits and produces no pollutants.The combustion gas products from the precombustion chamber are injected into the main combustion chamber at high temperature and at high velocity to produce highly efficient turbulent mixing of a lean fuel-oxidant mixture in the main combustion chamber and to produce effective ignition and efficient burning of the fuel at the lean fuel-oxidant ratios in the main combustion chamber for increased engine efficiency and lowered emissions as compared to existing engine systems using conventional spark ignition.The precombustion chamber mechanism incorporates injection structure for producing standing waves in the main combustion chamber to provide a plurality of highly effective ignition points.

Abstract: A piston-type internal combustion engine is described including a variable valve timing device controlling the timing of the intake valve, a coupling between the accelerator pedal and the variable timing device for varying the timing of the intake valve in response to the movement of the accelerator pedal, and means for maintaining a substantially constant compression ratio in the cylinder notwithstanding variations in the engine output. The latter means comprises a floating piston crown which is permitted to move further inwardly into the cylinder at the end of the compression stroke when the delay in closing the intake-valve is increased, than when the delay is decreased.

Abstract: The subject fuel injection means, disclosed herein with one of various types of internal combustion engines with which it may be employed, comprises a fuel pumping plunger, the pumping stroke of which is controlled by an inclined surface of a manually operable slide element. Said plunger is urged in a pumping direction by fluid pressure applied thereto from compression generated in the engine's combustion chamber and is spring biased in a non-pumping direction. A solenoid, operationally timed to the rotation of the engine's crankshaft, coacts with the pumping plunger to assure starting of the plunger's pumping stroke in proper timed relation to the compression and firing of an explosive charge in the engine's combustion chamber. In said pumping stroke, the plunger closes a fuel inlet to a related pump chamber and forces fuel from said pump chamber, past a one way check valve and into the engine's combustion chamber.

Abstract: This application discloses a two-open-position choke valve control system comprising:A housing;A first diaphragm which is linked with a choke valve shaft;A second diaphragm;A prop rod arranged between said first and second diaphragms, the length of the rod being shorter than the distance between said first and second diaphragms during their release conditions;A stopper means which prevents said second diaphragm from moving toward said first diaphragm;A first chamber formed between said first and second diaphragms and communicating with an intake pipe at the downstream of a carburetor throttle valve, and;A second chamber formed outside of said second diaphragm and communicating with said intake pipe through a device for detecting the driving conditions of a vehicle.

Abstract: Twin cylinder two cycle engine including a pair of stepped cylinders and a pair of stepped pistons slidable in said cylinders defining annular spaces of variable volume in said cylinders. The pistons are interconnected each other with 180.degree. phase difference. Air-fuel mixture introduced into the annular space in one cylinder is forced into the crankchamber of the other cylinder during the upward stroke of the associated piston, so that an additional charge is provided.

Abstract: A glow plug temperature simulator circuit produces an electrical signal having a rate of increase of potential level substantially corresponding to the rate of increase of glow plug temperature and a rate of decrease of potential level substantially corresponding to the rate of decrease of glow plug temperature upon glow plug energization and subsequent deenergization, respectively. An electrical switching arrangement is effective to complete a glow plug energizing circuit across an operating potential source in response to the application of operating potential and, thereafter, is effective to alternately interrupt and complete the glow plug energizing circuit in response to the increase of the electrical signal to a predetermined potential level and in response to the decrease of the electrical signal to another lower predetermined potential level, respectively, to cyclically complete and interrupt the glow plug energizing circuit.

Abstract: An air intake system for an internal combustion engine, particularly for a diesel engine containing a cylinder having a combustion chamber therein, is disclosed. The system comprises a spiral-shaped intake port formed in the cylinder head. The spiral-shaped intake port introduces intake air into the combustion chamber and compulsorily produces a swirling motion of the intake air while the air passes through the intake port. The system further comprises a baffle or baffles for attenuating the swirling motion of the intake air to an optimum level prior to the intake air being sucked into the combustion chamber.

Abstract: A piston and cylinder for two-cycle engines wherein the fuel-air mixture is precompressed in the crankcase and flows to the combustion chamber through transfer passages formed in the cylinder wall and under the control of the piston movement. The piston skirt is formed with windows or openings adjacent the end faces of the piston pin, the latter being mounted in piston pin bosses carried by bearing brackets depending from the piston head and, when the piston is at its lower dead center, the windows or openings register with the inlet openings of the transfer passages so that the precompressed fuel-air mixture then flows through the interior of the piston, the openings in the piston skirt and the transfer passages and into the combustion chamber itself which contains a depression volume.

Abstract: A low pollution internal combustion engine is disclosed in which a predetermined portion of a stratified charge is initially pre-formed in the part of the manifold which supplies the predetermined charge portion to the cylinder, said predetermined charge portion being composed of fuel-air mixture diluted by exhaust gas and pre-formed when the intake valve for the cylinder is in the closed condition, and subsequently being introduced together with the remaining portion of the stratified charge, when the intake valve is opened during the intake stroke of the engine.

Abstract: A reliable efficient rotary valve apparatus for internal combustion engines, configured for ease of installation and maintenance. Rotating valve apparatus controls transfer of intake and exhaust gases between intake and exhaust manifolds respectively of an internal combustion engine and the respective combustion cylinders thereof. Intake and exhaust portions of the rotary valve assembly are isolated by simple seal members. Activating means, responsive to rotation of the rotatable valve member, create positive fluid-flow transfer of gaseous currents through the rotating valve member. Spring biased, pressure equalizing plunger seal apparatus increases reliability and longevity of use of the rotary valve apparatus and maintains proper seals for fluid-flow passage between the rotating valve member and individual compression cylinders of the engine.

Abstract: In an internal combustion engine, an injection hole is provided in the cylinder head to inject narrow streams of air towards the spark gap, particularly during idling and low load running conditions. The injected air is 5 to 30% by weight of the intake fuel-air mixture provided via the intake manifold and creates a swirl or turbulence thereby increasing combustibility. The hole is connected via a sub intake passage to the main air intake passage upstream of the venturi in the carburetor or between the venturi and throttle valve.

Abstract: A fuel injection system for continuous injection to an internal combustion engine has a pivoting air sensor plate with a correction lever that engages a fuel control plunger for metering out fuel in proportion to the air flow. The system also includes a bimetallic, temperature-dependent strip which exerts an opening force on the correction lever when the engine is cold. An electric heater is energized by the starter switch and begins to reduce the force due to the bimetallic strip even before the engine has actually warmed up. A second electric heater of reduced power maintains the strip in disengagement during normal engine operation.

Abstract: A multi-channel, sequentially timed fuel injection system for an internal combustion spark ignited engine employs a solenoid actuated injector valve for each cylinder controlled by the outputs of separate variable width pulse generators. The pulse generators each employ a resistance-capacitance discharge timing circuit and a single thermistor, common to all the generators, sensitive to engine temperature is connected to the RC circuits of the generators in a first circuit configuration during starting of the engine which provides a wide range of fuel delivery rates for starting and in a second circuit configuration during normal operation in which the various RC circuits are isolated from one another so that interaction of the variable width pulse generators does not occur as a result of the common thermistor connection during normal engine operation.

Abstract: An internal combustion engine has a crankshaft offset to one side of the axis of the engine cylinder and an articulated connecting rod linkage operable to vary the stroke of the engine piston in accordance with engine operating conditions, so that different density fuel-air charges inducted into the cylinder will be compressed to substantially the same extent each time the cylinder is fired, regardless of throttle setting, engine speeds, or loads.

Abstract: An internal combustion engine cooled by the forced passage of fluid through ducts, in which such ducts are confined to the individual regions of the engine liable to overheat, the remaining parts of the engine which in operation rise only to acceptable temperatures being left free from such ducts. The invention includes structures to resist separation of the engine components under firing loads and to improve rigidity.

Abstract: An auxiliary intake passageway and an auxiliary intake valve operated for allowing an excessive air-fuel mixture to be drawn into a combustion chamber of an engine through the auxiliary intake passageway and for expelling the drawn excessive air-fuel mixture from the combustion chamber during low load operations of the engine and a bypass intake passageway and an auxiliary valve or a throttle valve operating device for increasing the flow of air passing through the intake passageway of the engine during the engine low load operations for ensuring the excessive air-fuel mixture drawn into the combustion chamber.

Abstract: Disclosed is a starting device for an internal combustion engine having a stationary bearing axle attached to the engine, a pulley rotatably mounted on the axle and adapted for accepting a starting rope wrapped thereabout, a recessed coupling attached to the drive shaft of the engine, coaxially surrounding the rope pulley in its recess and having a plurality of inwardly facing ratchet teeth.

Abstract: An idle speed control mounted on the body of a carburetor for controlling the idle speed of an internal combustion engine is disclosed. In a first condition, the throttle plate is maintained in a position to provide a "normal" idle speed and in a second condition a fixed engagement between the stop means and the throttle plate provides a fast "start-up" idle condition. In a preferred embodiment in the first condition, the throttle plate engages the stop means and the engagement is variably adjustable to vary the "normal" idle speed. The engagement of the throttle plate with stop means in the second condition is stable but may be released by movement of a throttle trigger.