Abstract

A starting device for a general-purpose engine according to one embodiment includes: a starter motor; a pinion gear mounted on an output shaft of the starter motor; a camshaft gear mounted on a camshaft; a crankshaft gear mounted on a crankshaft and meshing with the camshaft gear; and a gear assembly configured to transmit a driving force of the starter motor via the pinion gear to the camshaft gear and configured not to transmit a driving force of the camshaft gear to the pinion gear. The pinion gear, the camshaft gear, the crankshaft gear, and the gear assembly are disposed in a crankcase in a state where the pinion gear meshes with a gear included in the gear assembly.

IPC Classes  ?

• F02N 15/02 - Gearing between starting-engines and started enginesEngagement or disengagement thereof

Abstract

A startup failure determination/detection device comprising: an acquisition unit configured to acquire a measured temperature value from a temperature sensor for measuring the temperature of an ignition coil of an engine; and a detection unit configured to detect a startup failure in the engine on the basis of a time transition of the measured temperature value.

IPC Classes  ?

• F02M 1/08 - Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically
• F02D 45/00 - Electrical control not provided for in groups

Abstract

This automatic choke device is used to control the opening degree of a choke valve provided to an intake passage of an engine, and is provided with an acquisition unit configured so as to acquire the engine temperature measured by a first temperature sensor and an outside air temperature measured by a second temperature sensor, and an opening degree control unit configured so as to control the opening degree of the choke valve on the basis of the engine temperature and the outside air temperature.

IPC Classes  ?

• F02M 1/10 - Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically dependent on engine temperature, e.g. having thermostat
• F02D 41/06 - Introducing corrections for particular operating conditions for engine starting or warming up
• F02M 1/02 - Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling being chokes for enriching fuel-air mixture

Abstract

This battery unit mounting structure comprises: a box-like case attached to an engine or to a work machine on which the engine is mounted; a battery unit which is accommodated in the case and serves as a power supply source for a cell motor provided to the engine; and a cover which covers an opening of the case in which the battery unit is accommodated.

IPC Classes  ?

• F02N 11/08 - Circuits specially adapted for starting of engines
• F02N 11/00 - Starting of engines by means of electric motors
• F02N 11/12 - Starting of engines by means of mobile, e.g. portable, starting sets
• H01M 10/48 - Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
• H01M 50/20 - MountingsSecondary casings or framesRacks, modules or packsSuspension devicesShock absorbersTransport or carrying devicesHolders

Abstract

This start control device for an engine comprises a start operation control unit for causing a cell motor to perform cranking of the engine for at least a preset fixed cranking time, only when an engine start operation switch that connects to a relay for turning ON/OFF a power supply to the cell motor has been continuously operated in excess of a preset erroneous-operation determination time.

IPC Classes  ?

• F02N 11/08 - Circuits specially adapted for starting of engines

Abstract

An engine control device comprises: an interval control unit which, when a start operation is performed by the engine start operation switch and electricity is supplied from a battery to a starter motor, invalidates the start operation, performed by the engine start operation switch, within a predetermined interval period; a driving state determination unit that determines that the engine is in a driving state when detection of power generation input by an engine is started within the interval period and the voltage and current of the power generation input exceed predetermined thresholds; an erroneous operation prevention unit that invalidates the start operation performed by the engine start operation switch when the driving state determination unit determines that the engine is in the driving state; and a safety control unit which, if the power generation input is interrupted for longer than the predetermined period in a state in which a control ECU is started, determines that the engine is in a stopped state and continues to invalidate the start operation performed by the engine start operation switch.

IPC Classes  ?

• F02N 15/00 - Other power-operated starting apparatusComponent parts, details, or accessories, not provided for in, or of interest apart from, groups
• F02N 11/08 - Circuits specially adapted for starting of engines

Abstract

This engine start control device is provided with: a control ECU that causes a starter motor to crank an engine; and a temperature sensor that measures the surface temperature of an engine starting battery that serves as an electricity supply source for the starter motor. The control ECU includes: a locking determination unit that, if within a designated time determined in advance from the start of the control ECU, the surface temperature of the engine starting battery has risen by a designated temperature, determined in advance, or more from the temperature at the start of the control ECU, determines that the starter motor has locked; and a starting halt unit that, if the lock determination unit determines that locking has occurred, halts cranking of the engine by the starter motor.

IPC Classes  ?

• F02N 11/08 - Circuits specially adapted for starting of engines
• F02B 77/08 - Safety, indicating, or supervising devices

Abstract

This engine start-up control device comprises: a control ECU which causes a starter to crank an engine; and a current sensor which measures a supply current to the starter. The control ECU includes a lock determination unit which determines that the starter is locked when a state in which the supply current to the starter measured by the current sensor is at a predetermined current value or higher continues for a predetermined first time period or longer and a start-up stop unit which stops the starter from cranking the engine when the lock determination unit determines that the starter is locked.

IPC Classes  ?

• F02N 11/08 - Circuits specially adapted for starting of engines

Abstract

A hunting detection device of the present disclosure is for detecting hunting in an engine equipped with a carburetor. The hunting detection device comprises: an acquisition unit that is configured to acquire the engine speed and the outside air temperature which is measured by a temperature sensor; a detection unit that is configured to detect hunting if a speed fluctuation state in which the outside air temperature is equal to or below a first reference value is detected; and an opening degree controller that is configured to control the opening degree of a choke valve provided to an intake passage of the engine. If the detection unit detects hunting, the opening degree controller executes closing control to reduce the opening degree of the choke valve.

IPC Classes  ?

• F02M 1/10 - Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically dependent on engine temperature, e.g. having thermostat
• F02D 41/06 - Introducing corrections for particular operating conditions for engine starting or warming up

Abstract

A general-purpose engine starting device according to an embodiment is provided with: a starter motor; a pinion gear attached to an output shaft of the starter motor; a camshaft gear attached to a camshaft; a crankshaft gear which is attached to a crankshaft and which meshes with the camshaft gear; and a gear assembly configured in such a way as to transmit the starter motor driving force that has passed through the pinion gear to the camshaft gear, and not to transmit the camshaft gear driving force to the pinion gear. The pinion gear, the camshaft gear, the crankshaft gear, and the gear assembly are arranged in a crank case with the pinion gear and the gears contained in the gear assembly in a meshed state.

IPC Classes  ?

• F02N 15/02 - Gearing between starting-engines and started enginesEngagement or disengagement thereof

Abstract

This protection control device for an engine starting battery is a protection control device for an engine starting battery which is a power source of a starter motor that cranks an engine, the protection control device comprising: a control ECU which controls the charging/discharging of one or more battery cells constituting the engine starting battery; and a protection circuit which protects the one or more battery cells from overcharging and overdischarging, wherein the control ECU limits the supply of electricity to the starter motor, if the battery voltage when the engine switch is turned on is lower than a first predetermined value.

IPC Classes  ?

• B60R 16/033 - Electric or fluid circuits specially adapted for vehicles and not otherwise provided forArrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric for supply of electrical power to vehicle subsystems characterised by the use of electrical cells or batteries
• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• H02J 7/04 - Regulation of the charging current or voltage

Abstract

A device for protecting a battery for starting an engine, the device comprising: a cell motor relay that has provided thereto a contact point between a cell motor and a cell motor feed terminal of the battery for starting an engine, and that is, in accordance with a command from a control ECU, actuated to close the contact point provided between the cell motor and the cell motor feed terminal; and a battery protection relay that has provided thereto a contact point provided between a battery cell and the cell motor feed terminal, and that is, in accordance with a command from the control ECU, actuated to close the contact point provided between the battery cell and the cell motor feed terminal, wherein, when an engine switch is turned on and if a battery voltage is higher than a predetermined certain value, the control ECU commands the battery protection relay to close the contact point and also commands the cell motor relay to close the contact point, through a starting operation of an engine-starting operation switch.

IPC Classes  ?

• F02N 11/08 - Circuits specially adapted for starting of engines

Abstract

This engine startup control device is provided with a control ECU for causing a starter motor to crank an engine, an external device output terminal which is provided in the control ECU to supply electricity to an external device provided outside the control ECU, and an engine startup operating switch which is connected to the control ECU to start the starter motor, wherein the control ECU includes an operation determining unit which determines that the external device is operating if the power being supplied from the external output terminal to the external device is equal to or greater than a predetermined threshold, and a startup restricting unit which restricts the operation of the starter motor if the operation determining unit determines that the external device is operating, even if a startup operation is performed using the engine startup operating switch.

IPC Classes  ?

• F02M 1/10 - Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically dependent on engine temperature, e.g. having thermostat
• F02N 11/08 - Circuits specially adapted for starting of engines

Abstract

e).

IPC Classes  ?

• F02N 3/02 - Other muscle-operated starting apparatus having pull-cords
• F16D 41/12 - Freewheels or freewheel clutches with hinged pawl co-operating with teeth, cogs, or the like
• F02N 5/02 - Starting apparatus having mechanical power storage of spring type
• F16H 33/02 - Rotary transmissions with mechanical accumulators, e.g. weights, springs, intermittently-connected flywheels
• F16D 43/16 - Internally controlled automatic clutches actuated entirely mechanically controlled by angular speed with centrifugal masses actuating the clutching members directly in a direction which has at least a radial componentInternally controlled automatic clutches actuated entirely mechanically controlled by angular speed with centrifugal masses themselves being the clutching members with clutching members having interengaging parts
• F02N 15/02 - Gearing between starting-engines and started enginesEngagement or disengagement thereof

Abstract

An engine is equipped with a starter motor which is attached to an engine main body and is configured to perform cranking of a crankshaft. The engine is further equipped with a battery pack (37). The battery pack is equipped with a lithium-based cell which is attached to the engine main body and which is configured to supply electric power which drives the starter motor.

IPC Classes  ?

• F02N 11/08 - Circuits specially adapted for starting of engines
• F02N 3/02 - Other muscle-operated starting apparatus having pull-cords
• F01P 1/06 - Arrangements for cooling other engine or machine parts
• F02N 11/00 - Starting of engines by means of electric motors
• F02B 67/00 - Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functionsDriving auxiliary apparatus from engines, not otherwise provided for

Abstract

A recoil starter (103) is provided with a pull rope reel (22), a ratchet wheel (31), a pulley (32), ratchet pawls (33), and an outer wall (32e). Each of the ratchet pawls (33): can oscillate between an engagement position where the ratchet pawl (33) engages with a protruding part (31a) and a non-engagement position where the ratchet pawl (33) does not engage with the protruding part (31a); and is always urged toward the engagement position. A supporting surface (32d) of the outer wall (32e) supports the base end part of each of the ratchet pawls (33) when the ratchet pawl 33 is at the engagement position. A foreign matter discharge part (32f) of the outer wall (32e) connects the inner space of the pulley (32) and the outer space of the pulley (32).

IPC Classes  ?

• F02N 3/02 - Other muscle-operated starting apparatus having pull-cords
• F16D 41/12 - Freewheels or freewheel clutches with hinged pawl co-operating with teeth, cogs, or the like

Abstract

This fuel tank is provided with a fuel tank body for accommodating engine fuel, and a resilient member provided on a bottom surface of the fuel tank body. The resilient member includes at least one protruding portion which is provided protruding downward and which has a ground-contacting surface which comes into contact with the ground. In addition, the resilient member has a shape which is asymmetric in the axial direction of an engine crankshaft, and/or in a horizontal direction which is orthogonal to said axial direction. The fuel tank may be provided with two resilient members having mutually different moduli of elasticity.

IPC Classes  ?

• F02M 37/00 - Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatusArrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
• A01D 34/68 - MowersMowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis hand-guided by a walking operator with motor driven cutters or wheels

Abstract

This muffler cover, which is capable of being mounted on an engine in such a way as to cover an exhaust muffler of the engine, includes: a tank-facing surface which is formed in such a way that when the muffler cover is mounted on the engine, the tank-facing surface faces a muffler-side surface of a fuel tank of the engine, across a gap, and which is configured in such a way that, together with the muffler-side surface, the tank-facing surface guides cooling air to an outside air intake port of a cooling fan of the engine; and at least two mutually independent ribs which are formed in such a way as to project from the tank-facing surface toward the muffler-side surface of the fuel tank.

IPC Classes  ?

• F01P 5/06 - Guiding or ducting air to or from ducted fans
• F02M 35/06 - Air cleaners specially arranged with respect to engineMounting thereon combined or associated with engine's cooling blower or fan, or with flywheel
• F02B 63/00 - Adaptations of engines for driving pumps, hand-held tools or electric generatorsPortable combinations of engines with engine-driven devices
• F01N 13/14 - Exhaust or silencing apparatus characterised by constructional features having thermal insulation

Abstract

An air cleaner in a two-stroke engine having an air supply passage and an air/fuel mixture supply passage includes: a first air passage and a second air passage arranged in parallel, the first air passage being communicated with the air supply passage and the second air passage being communicated with the air/fuel mixture supply passage; and a choke valve opening and closing both of the first air passage and the second air passage of the air cleaner. The choke valve has a pivot axis and a pivotable valve member pivoting about the pivot axis to open and close respective inlet openings of the first air passage and the second air passage. One of the first air passage and the second air passage that is located closer to the pivot axis has an inlet opening flattened along a pivoting edge of the valve member.

IPC Classes  ?

• F02B 25/00 - Engines characterised by using fresh charge for scavenging cylinders
• F02M 35/024 - Air cleaners using filters, e.g. moistened
• F02M 17/34 - Other carburettors combined or associated with other apparatus, e.g. air filters
• F02M 1/02 - Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling being chokes for enriching fuel-air mixture
• F02B 75/02 - Engines characterised by their cycles, e.g. six-stroke
• F02B 25/22 - Means for reducing the mixing of charge and combustion residues or for preventing escape of fresh charge through outlet ports, not provided for in, or of interest apart from, groups by forming air cushion between charge and combustion residues

Abstract

A scavenging passage structure for a two-stroke engine, having a scavenging passage communicating a scavenging port provided in a cylinder with a crank chamber formed inside a crankcase, the scavenging passage being formed to extend through respective fastening surfaces of the cylinder and the crankcase. The scavenging passage includes a cover member attached inside the crankcase to be in contact with an inner wall surface of the crankcase, and a groove formed in at least one of the inner wall surface of the crankcase contacting the cover member, and the cover member contacting the inner wall surface of the crankcase, the groove forming part of the scavenging passage connecting to the crank chamber and to an upper face of the crankcase.

IPC Classes  ?

• F02B 25/00 - Engines characterised by using fresh charge for scavenging cylinders
• F02B 33/12 - Engines with reciprocating-piston pumpsEngines with crankcase pumps with reciprocating-piston pumps other than simple crankcase pumps with the pumping cylinder situated between working cylinder and crankcase, or with the pumping cylinder surrounding working cylinder the rear face of working piston acting as pumping member and co-operating with a pumping chamber isolated from crankcase, the connecting-rod passing through the chamber and co-operating with movable isolating member
• F02B 33/00 - Engines characterised by provision of pumps for charging or scavenging

Abstract

Providing an engine speed control device and an engine speed control method, wherein the no-load condition of the farm working machine can be estimated independently of the farm working machine and a no-loading operation condition of the engine can be automatically shifted to an idling condition. An engine speed control device with which the engine drives a farm working machine, the engine speed control device provided with: a memory section 8 in which the throttle opening threshold levels corresponding to the target engine speeds are memorized; a first judgment device that reads out the throttle opening threshold level corresponding to the target engine speed from the memory device, and judges whether or not the current throttle opening threshold level is smaller than or equal to the throttle opening threshold level corresponding to the target engine speed; a target engine speed determining section 16 by which the target engine speed diminishes to a low idling engine speed in a case where the first judgment device judges that the current throttle opening threshold level is smaller than or equal to the throttle opening threshold level corresponding to the target engine speed; and, a throttle opening regulating device 14 that regulates the opening of the throttle valve based on the target engine speed.

IPC Classes  ?

• F02D 31/00 - Use of non-electrical speed-sensing governors to control combustion engines, not otherwise provided for
• F02M 3/09 - Valves responsive to engine conditions, e.g. manifold vacuum
• F02D 29/00 - Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
• F02D 41/02 - Circuit arrangements for generating control signals
• F02D 41/08 - Introducing corrections for particular operating conditions for idling
• F02D 11/10 - Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type

Abstract

A zero-governor fitting structure for a gas engine, configured in such a manner that the lower half of a fuel tank for a gasoline engine is utilized as a support box for supporting the zero-governor in which a gas supply inlet pipe and a zero governor can be reliably mounted with vibration and heating of the zero-governor avoided. A zero-governor mounting structure for a gas engine equipped with a zero-governor is provided with a support box fixed to the upper part of the gas engine. The support box is formed as a box having two depths. The zero-governor is supported, through a vibration insulation gasket, on the bottom plate of the shallower depth space of the support box. A gas supply inlet pipe and an elbow joint which is connected to the gas supply inlet pipe and can be bent the direction of the gas flow at a right angle toward the zero-governor are received in the deeper depth space, and the elbow joint is connected to the bottom inlet of the zero-governor.

IPC Classes  ?

• F02M 37/00 - Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatusArrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines

Abstract

s, the an oil discharge device being arranged at an upstream side of a gas mixer 110 mixing the fuel gas with the intake air for the engine, the upstream being in relation to the intake air; the outlet regarding the air from the oil mist separator communicates with an air inlet of the air cleaner 25 for the engine intake air, through a breathing pipe 5.

IPC Classes  ?

• F01M 13/04 - Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil

Abstract

In this multipurpose engine, a fuel gas evaporated within a fuel tank of the engine is drawn out of the fuel tank and is adsorbed by an adsorbing material, the fuel gas is separated from the adsorbing material, and then the fuel gas separated from the adsorbing material is suctioned into an intake system of the engine by using negative pressure inside the intake system. The adsorbing material is accommodated in a canister, and two connection ports used for connection with the canister are respectively provided at a heat-insulating intake pipe between a carburetor and the engine and at a clear section of an air cleaner.

IPC Classes  ?

• F02M 33/04 - Other apparatus for treating combustion-air, fuel or fuel-air mixture for collecting and returning condensed fuel returning to the intake passage
• F02M 33/02 - Other apparatus for treating combustion-air, fuel or fuel-air mixture for collecting and returning condensed fuel

Abstract

A stratified scavenging two-stroke cycle engine with the check valve for introducing scavenging air simplified in construction is provided. The gasket between the flange part forming an air supply chamber and a mixture passage at a side of the cylinder and the passage connecting member having an air flow passage and a mixture flow passage is composed to have an integral leaf valve for allowing air in the air flow passage in the passage connecting member to flow only toward the air supply chamber which is connected to the scavenging passages of the engine so that the gasket has a function as a seal member and that as a check valve.

IPC Classes  ?

• F02B 25/00 - Engines characterised by using fresh charge for scavenging cylinders

Abstract

A structure of crankcase-integrated cylinder block for a small internal combustion engine is posed to increase strength and rigidity in order to reduce particularly vibration and noise. A cylinder part and a crankcase part are formed into a box-like shape being cast in one piece, a crankcase cover is fixed to the crankcase part to cover an opening on a side in anteroposterior thereof, a crankshaft bearing boss has a crankshaft bearing hole being provided at a central part of a back wall of the crankcase part to protrude to both inner and outer sides of the back wall for supporting an end sides of a crankshaft, wherein an inner peripheral rib is formed along the corner where the back wall of said crankcase part connects to a peripheral wall extending from the periphery of the back wall to heave inward form the corner part.

IPC Classes  ?

• F02F 1/00 - CylindersCylinder heads
• F02F 7/00 - Casings, e.g. crankcases

Abstract

The invention provides a method and construction of vibration control supporting a cooling fan cover. In a forcer-air-cooled engine having a cooling fan cover fixed directly by means of fixing bolts to the cylinder block at fixing foot parts provided at a peripheral border of the fan cover, band-like vibration damping members are disposed between the peripheral border of the fan cover and the cylinder block in each region of the peripheral border belonging to each sector part defined between two adjacent fixing points of two adjacent fixing foot parts among said plurality of fixing foot parts respectively so that each of said damping members is pressed against the cylinder block by each region of the peripheral border when the bolts are tightened, said band-like damper members are flexible damping members each of which is disposed in an essential part of loop of vibration of the periphery for preventing generation of noise due to vibration of the fan cover with the fixing points as nodes of vibration resonating to cylinder block vibration, and said band-like flexible vibration damping members are adjusted thereby to adjust elastic force and damping capacity of the damping members so that resonance of the fan cover occurs at a rotation speed of engine higher than normal rotation speed thereof.

IPC Classes  ?

• F01P 1/02 - Arrangements for cooling cylinders or cylinder heads, e.g. ducting cooling-air from its pressure source to cylinders or along cylinders
• F01P 7/04 - Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio

Abstract

A forced-air-cooled engine has a main blow-out opening provided to a back plate of a cooling fan cover at a position facing a cylinder part for blowing out cooling air for cooling a cylinder part and a secondary blow-out opening provided to the back plate at a position opposite to the main blow-out opening in regard to the crankshaft center for cooling a part of a crankcase part, wherein a cooling air guide cover is equipped which is composed of a cylinder air-guide cover part which guides air blown out from the main blow-out opening to flow to cool the cylinder part and cylinder head, and a top cover part which guides air blown out from the secondary blow-out opening to flow along a side face of the crankcase part to cool there and then flow into midstream of the cooling air flow blown out from the main blow-out opening and cooling the cylinder part and cylinder head.

IPC Classes  ?

• F01P 1/02 - Arrangements for cooling cylinders or cylinder heads, e.g. ducting cooling-air from its pressure source to cylinders or along cylinders