Abstract: A load adjustment device for an actuator that determines the power of an internal combustion engine, designed as a throttle valve and is disposed on an actuator shaft in a housing, the actuator shaft being pivotally drivable about the rotary axis of the actuator shaft between a minimal load setting defined by a minimal load stop and a full load setting defined by a full load stop by means of a reversibly drivable actuating drive via an actuating part rotationally fixed to said shaft. The actuator shaft is subject to a load in the minimum load direction by a restoring spring. The actuating part can be subjected to a load by a leg of a torsion spring disposed radially outside the pivoting range of the part, the leg of the torsion spring extending into the pivoting range of the actuating part.

Abstract: A sensor unit includes a unit main body mounted on a throttle device, and a pressure sensor chamber that is provided at the unit main body and that accommodates an intake pressure sensor to detect an intake pressure through an intake pipe. The pressure sensor chamber is divided by a partition into a pressure receiving area to receive a pressure in the intake pipe and a pressure detecting area to detect the pressure by the intake pressure sensor, such that the pressure receiving area communicates with the pressure detecting area through a communication portion. A foreign substance is prevented from flowing into the intake pressure sensor when guiding air in the intake pipe to the intake pressure sensor, thereby improving detection accuracy by the intake pressure sensor.

Abstract: In an adjusting device having a gear, high gear ratios are often demanded. High transverse forces often arise in the gear and must be intercepted by suitably dimensioned bearings. In the adjusting device proposed here, having a basic body and a cap, an embedded device is provided between a shaft, serving to support a gear wheel, and the cap. With the aid of the embedded device, good bearing of the gear wheel on both sides is attained, regardless of component tolerances. The adjusting device is intended especially for vehicles having an internal combustion engine.

Abstract: Throttle valves often have the problem that the throttle must be precisely positioned with and fixed to the throttle shaft. In the throttle valve (2) proposed by the invention, hardening filler material (10) is inserted into the intermediate space (22) between the throttle (6) and the throttle shaft (8). After said filler material (10) has hardened, the throttle (6) is precisely positioned relative to the throttle shaft (8) and fixed in a torque-proof manner. The throttle valve may be used for controlling the output of an internal combustion engine.

Abstract: Three or more independent passages are coupled to respective cylinders which are different from each other, and a collective portion where the independent passages collect is provided. An exhaust turbocharger is arranged downstream of the collective portion. Rotary throttle valves are arranged respectively in the independent passages upstream of the collective portion. At least two of the throttle valves are supported by a common rotary axis. The independent passages with the throttle valves supported by the common rotary axis are coupled to cylinders which have exhaust strokes which are not adjacent to each other. Accordingly, the exhaust gas can be supplied to the exhaust turbocharger efficiently.

Abstract: A throttle body (2) includes a resin main body (3) defining a bore (7) through which intake air flows, a valve body (60) having a shaft part (20) rotatably supported by the resin body (3) and a valve part (4) for opening and closing the bore (7) of the main body (3), and a resin cover body (40) attached to the main body (3). The cover body (4) is attached to the main body (3) by welding.

Abstract: In order to provide a carburettor unit for motorized equipment, in particular hand-operated motorized equipment such as a chain saw, a trimmer, a lawn-cutting appliance, a foliage clearing appliance or suchlike, having a housing, in which a throttle valve and a choke valve are held so as to be movable respectively between a closed position and an open position, which overcomes the disadvantages of the prior art and in which an incorrect position between the throttle valve and the choke valve is avoided, it is proposed that a locking element is provided, which is adjustable through the movement of the throttle valve and cooperates with the choke valve such that a movement of the choke valve into the closed position is locked when the motorized equipment is set in operation.

Abstract: A cross-sectional shape of a first intake passage is formed in a circular shape and a cross-sectional shape of a second intake passage is formed in a rectangular shape. Thus, an opening area of a second intake throttle portion can be made larger than an opening area of a first intake throttle portion even when the opening area of the first intake throttle portion is narrow and an intake air quantity supplied into a combustion chamber of an engine is small as in the case of engine start-up or engine idling operation. Accordingly, an intended strong tumble flow in accordance with a demand for improving a combustion efficiency in the combustion chamber can be generated in the combustion chamber while achieving the intake air quantity necessary during the engine start-up or the engine idling operation.

Abstract: An electronically controlled throttle valve unit includes a valve shaft supported by a throttle body, a throttle valve provided on the valve shaft rotatably therewith, an actuator for controlling the valve shaft, and a mechanical valve opening/closing mechanism. The mechanical valve opening/closing mechanism comprises: a valve lever provided on the valve shaft rotatably therewith; a cam lever supported rotatably with respect to the valve shaft so as to be directly operated through a throttle operation; and a link lever supported rotatably by the throttle body and transmitting a rotation of the cam lever in a direction of opening the throttle valve to the valve lever so as to rotate the valve lever and the valve shaft in a throttle valve opening direction with a predetermined rotation angle characteristics.

Abstract: A throttle valve body includes a main body and a main valve. The main body includes an intake passage, a bypass passage, and a mounting hole. The intake passage has an upstream portion and a downstream portion. The bypass passage has an upstream section in fluid communication with the upstream portion, a downstream section extending along a first axis, and a downstream end in fluid communication with the downstream portion of the intake passage. The mounting hole extends along a second axis intersecting the first axis. The main valve is disposed in the intake passage to divide the intake passage into the upstream portion and the downstream portion.

Abstract: The present invention relates to a valve device (13) for controlling a gas flow in a fresh air system (6) of an internal combustion engine (2), in particular of a motor vehicle, with a housing (17) which encloses at least one duct section (19) through which the gas flow (14) can pass transversely to the main flow direction (18), with at least one flap (15) which can be rotated about an axis of rotation (21) which runs transversely with respect to the main flow direction (18) in the duct section (19). In order to improve the fail-safety of the valve device (13), at least one rotary frame (24) is provided, which can be rotated about an axis of rotation (25) which runs transversely with respect to the main flow direction (18) in the duct section (19) and has a frame opening (26) through which the gas flow (14) can pass.

Abstract: In an electronic throttle control system, a target intake pipe pressure as well as a presumed value for the intake pipe pressure is calculated, so that a deviation between the target value and the presumed value for the intake pipe pressure is calculated. The deviation is compensated in an advancing side by an amount corresponding to a delay of response in the throttle control system. An intake air amount passing through a throttle valve is calculated based on the above compensated deviation and a presumed intake air amount. A target opening degree of a throttle valve is finally calculated based on the above-calculated intake air amount passing through a throttle valve. Accordingly, a response and stability of the throttle control can be improved.

Abstract: A fuel injection unit is designed for replacement of existing carburetors. The fuel injection unit can be sized similarly to the existing carburetor. The fuel injection unit can have concealed fuel injectors. End caps can be provided that overlie the fuel injectors and that contain fuel line connections. The end caps provide an appearance of carburetor fuel bowls while generally concealing the fuel injectors and the associated fluid connections.

Abstract: An electronic throttle device includes a throttle body, a bulge, and a ring. The throttle body includes a bore part having an approximately cylindrical shape. The bore part is connected to an upstream air hose such that the upstream air hose is located on an outside of the bore part and is fastened with a fastening member from an outside of the upstream air hose. The bulge is discontinuously located along an outer circumference of the bore part and has a groove along an outer circumference of the bulge. The ring has a cross-sectional dimension larger than a depth of the groove in a radial direction of the bore part, and is located into the groove to configurate a protruding part that protrudes radially outwardly and extends entirely on the outer circumference of the bore part.

Abstract: An air intake device for an engine is provided that includes a throttle body (1), a throttle valve (5) that has a valve shaft (5a) rotatably supported on the throttle body (1), a throttle drum (8) connected to one end of the throttle valve (5), a throttle sensor (51) connected to the other end of the valve shaft (5a), a bypass (20) bypassing the throttle valve (5), and a bypass valve (25) that opens and closes the bypass (20), a bearing boss (3) supporting one end part, on the throttle drum (8) side, of the valve shaft (5a) being integrally and projecting provided on one side face of the throttle body (1), wherein the bypass (20) is formed so as to surround the bearing boss (3). This enables the air intake device for an engine to be made compact in spite of the bypass being present.

Abstract: A fuel supply system for a boat minimizes and prevents deterioration in combustion efficiency of the engine. The fuel supply system includes a throttle body that is connected to an engine and that supplies air to the engine, and an injector that injects fuel to the throttle body. The injector is configured to inject fuel to a direction opposite to an airflow direction in the throttle body.

Abstract: An intake charge regulating apparatus for an engine includes a throttle body having a throttle bore formed therein for communicating with an intake port, and a throttle valve for controlling flow through the throttle bore. A throttle-driving mechanism includes an electric motor and a transmission mechanism for decelerating a driving force of the electric motor and for transmitting the driving force to the throttle valve. A camshaft sprocket is fixed to an end portion of a camshaft, which is included in a valve train for driving intake and exhaust valves in a cylinder head to open and close. The throttle-driving mechanism is arranged opposite a side where the camshaft sprocket is located in an axis direction of the crankshaft. The electric motor is disposed between the throttle body and the cylinder head in top plan view.

Abstract: The invention relates to a method which uses an injection mould for the production of an intake system which is composed of plastic and is intended for internal combustion engines, and which has a plurality of parallel-running intake pipes and which has, arranged in the intake pipes, throttle flaps operated by way of a shared shaft bearing against bearings located in the walls of the intake pipe. A simplified production process is obtained if two mandrels (1, 2) of the injection mould, intended for formation of apertures for the bearings, are inserted respectively from one side of the injection mould in such a way that ends of the mandrels (1, 2) bear against one another in the injection mould, and if the method of production of apertures situated further outwards, with respectively greater diameter than the adjacent inwardly situated apertures is such that each mandrel (1, 2) is of staged shape, and the mandrels (1, 2) are drawn out during demoulding at the two sides of the injection mould.

Abstract: A magnesium-based throttle body is disclosed. The throttle body is manufactured by using a mold for manufacture of a throttle body. The throttle body includes a cooling water tube fixing portion into which a cooling water tube is press-inserted, the cooling water tube fixing portion being formed integrally with the throttle body.

Abstract: A resin main body (3) defining a bore (7) through which intake air flows, and a valve body (60) having a shaft part (20) rotatably supported by the main body (3) and a valve part (4) for opening and closing the bore (7) of the main body (3) are provided. The main body (3) is molded with the valve body (60) inserted together with a pair of bearing sleeves (24). At the time of molding the main body (3), the bearing sleeves (24) are biased in a direction opposite to the flow of the intake air with the valve body (60) being positioned in place.

Abstract: An throttle body for rotating a valve shaft of an air-intake throttle valve through a decelerating mechanism by a motor and change the opening area of an air-intake passage by rotating the valve shaft is equipped with a lever portion that is disposed so as to be interlocked with the decelerating mechanism and regulates the opening degree of the air-intake throttle valve under the full-open state, and an adjusting screw that is threadably inserted from the outside of the body portion and abuts against the lever portion in the body portion to change the opening degree of the air-intake throttle valve under the full-open state.

Abstract: To reduce cost and size of a throttle valve control device, one end 3a of a throttle valve shaft 3 fixedly has a throttle valve lever 5 energized in valve opening direction by a throttle valve lever open spring 8, and rotatably has a drive gear 6 connected to a motor gear 9, a limp opening control lever 15 is fixed at another end 13b of a drum shaft 13 axially supported by a first cover 12, an accelerator drum 14 energized in valve closing direction by a drum close spring 16 is fixed at one end 12a, a first opening directional end face 5a of the throttle valve lever 5 is provided facing a limp opening control end face 15b, and a second opening directional end face 5b of the throttle valve lever 5 is provided facing a drive pin 6a of the drive gear 6.

Abstract: A throttle assembly including a first throttle component that is formed of a plastic material including a conductive additive substantially homogeneously dispersed within the plastic material, and a second throttle component is axially aligned with the first throttle component and movable relative to the first throttle component between a first position and a second position to selectively vary a flow through the throttle assembly. A terminal is coupled to the first throttle component such that electricity may be provided to the first throttle component, thereby resistively heating the first throttle component via the conductive additive and a flow window is defined in one of the first throttle component and the second throttle component.

Abstract: An assembly for controlling an air intake runner of an air intake manifold. The assembly includes a cartridge including a plurality of compartments. Each of the compartments has a plurality of that are joined to define a central opening and an outer perimeter. Adjacent compartments are spaced apart to define a groove between each of the compartments. The assembly also includes bushing carriers that are configured to be snap-fit into one of the grooves of the cartridge. The assembly further includes bushings configured to rotatably fit within the central openings of the bushing carriers. Each of the bushings has an outer rim and an open center. Flaps including a slot and having a shape configured to substantially adjustably seal the central opening are also included and a shaft is included that extends through the slots of the flaps and the open centers of the bushings.

Abstract: A leisure vehicle equipped with an internal combustion engine as a power unit to drive the leisure vehicle, including a drive wheel, a slip sensor unit configured to detect a slip of the drive wheel, a throttle device mounted to the internal combustion engine, a throttle valve position changing device configured to change a position of a throttle valve of the throttle device, a throttle close operation sensor unit configured to detect that a rider has performed a throttle close operation to close a throttle of the throttle device, and a controller configured to control an operation of the throttle valve position changing device.

Abstract: A compact throttle device with a short air intake pipe length. A throttle device includes: throttle bodies that define air intake paths; throttle valves that are disposed in the air intake paths and adjust the air flow rate in the air intake paths; a throttle shaft that rotatably supports the throttle valves; a motor that rotates the throttle shaft; and a gear that connects the throttle shaft to the motor. A pin is provided as a protrusion on the peripheral surface of the throttle shaft. The gear externally fitted and fixed to the throttle shaft has, on a fixing ring that is externally fitted to the throttle shaft, a housing groove for housing the pin, the housing groove being impelled against the pin by a spring.

Abstract: An intake manifold assembly includes an intake manifold having an inlet configured to receive an air/fuel mixture from a carburetor, an outlet configured to discharge the air/fuel mixture into a combustion chamber, an interior wall at least partially defining an intake passageway fluidly communicating the inlet and the outlet, and an aperture in the interior wall. The aperture is positioned between the inlet and the outlet. The intake manifold assembly also includes a first regulator received in the aperture and at least partially positioned in the intake passageway to effectively decrease the cross-sectional open area of the intake passageway. The first regulator is selectable from a plurality of regulators configured to each be at least partially positionable in the intake passageway. The first regulator is configured to be removed and replaced by a second regulator from the plurality of regulators without disassembly of the intake manifold from the carburetor.

Abstract: A throttle plate for use with internal combustion engines comprised of a relatively thin piece of material so that installation of the throttle plate between the carburetor or throttle body and intake manifold of a vehicle does not require additional brackets or components to correct throttle cable linkage length or geometry. The throttle plate comprises a plate having apertures to accommodate pre-existing connectors and a perimeter that corresponds to connections between, and the geometry of, the carburetor or throttle body and intake manifold. The plate fits between the carburetor or throttle body and intake manifold and defines at least one airflow hole corresponding to the airflow path in the carburetor or throttle body. If there are multiple airflow paths between the carburetor or throttle body and intake manifold, then there will be multiple airflow holes. One or more vanes integral with the plate extend radially from the perimeter of each airflow hole toward its center.

Abstract: Provided is a throttle valve device for an internal combustion engine which is favorably protected from icing, and enables a favorable control of the intake flow rate by avoiding an abrupt increase in the flow rate particularly in a small opening angle range. An upstream recess (21) and a downstream recess (22) are formed in a lower part of the throttle bore (11) of the throttle valve device. Moisture that may deposit on the inner wall of the throttle bore is allowed to be drained to the recesses. A cross sectional area of one of the recesses over which the lower edge of the throttle valve member sweeps as the throttle valve member (30) opens from the fully closed position is smaller than that of the other recess so that an abrupt change in the intake flow rate can be avoided in a small opening angle region.

Abstract: A butterfly valve including a housing having a hollow passage defining a flow path and a shaft mounted to the housing and extending transversely across the flow path. The shaft defines an axis of rotation for a butterfly valve element carried on the shaft. The valve element can be rotated about the axis between an open position permitting flow along the flow path and a closed position restricting flow along the flow path. The butterfly valve element includes a thin, substantially disc-shaped, flow-regulating plate having front and rear faces and a flow-straightening vane extending from one of the faces transversely relative to the shaft. The vane is solid and extends substantially to the wall of the hollow passage thereby defining separate non-communicating flow channels on opposite sides thereof for reducing flow turbulence and for straightening and accelerating flow across the plate.

Abstract: A marine vessel propulsion device includes an engine, an intake pathway which has a gas flow hole in the inner surface thereof and is arranged to supply air to the engine, and an air restrictor disposed on the upstream side with respect to the gas flow hole of the intake pathway. The air restrictor has a vent hole, and is arranged to restrict the amount of air to flow into the engine via the intake pathway. The vent hole of the air restrictor is arranged at a position which is near the inner surface of the intake pathway and corresponds to the gas flow hole.

Abstract: An intake air amount controlling apparatus of an engine is provided. The apparatus comprises an intake manifold that is branched from an intake manifold collecting portion of the engine. The intake manifold communicates with an intake port of a cylinder head of a corresponding cylinder. The apparatus further comprises a throttle valve in the intake manifold of the cylinder and a throttle bore provided in the intake manifold. The throttle bore has a curved surface. The throttle valve rotates such that one half of the throttle valve contacts with the curved surface of the throttle bore until the throttle valve reaches a predetermined opening degree. Thus, an air flow via the one half of the throttle valve is prevented from entering the intake port. An air flow via the other half of the throttle valve is allowed to enter the intake port.

Abstract: A throttle valve device includes at least one throttle body (1, 2, 3), a throttle valve (4) and a throttle valve shaft (5), with which the throttle valve (4) is adjustably arranged in the throttle body (1, 2, 3). In order for these parts to be able to function more trouble free and be manufactured at a more favorable price, the throttle body comprises an inner cylinder (1) made of a hard, smooth material around which at least partially an outer cylinder (2) made of thermoplastics is formed.

Abstract: A throttle valve of the invention includes a clearance closing member provided along a peripheral edge of a valve body displaceably and elastically deformable in a direction extending along an axis of an intake passage, a direction perpendicular to the axis of the intake passage, and a direction inclined with respect to the axis of the intake passage, for closing a clearance between the peripheral edge of the valve body and an inner wall surface of the intake passage.

Abstract: A device for detecting the angle of rotation of a throttle valve operated by an electric motor is disclosed. The valve is rotatably supported on a throttle valve shaft in an intake system of a throttle valve housing, wherein an actuator motor coupled to the throttle valve shaft predefines the throttle valve angular position in a manner controlled by a control unit, and wherein a predetermined value of the throttle valve angular position is predetermined by a manually operated predetermined-value input apparatus and is fed to the control unit. The predetermined-value input apparatus is coupled to a predetermined value sensor shaft, wherein the angular position of the predetermined value sensor shaft corresponds to the manually predefined predetermined value of the throttle valve angular position.

Abstract: In a general-purpose internal combustion engine having a throttle valve and a choke valve each installed in an air intake passage connected to a combustion chamber, air sucked in flowing through the air intake passage and mixing with fuel supplied by a carburetor to generate an air-fuel mixture that enters the combustion chamber of a cylinder and is ignited to drive a piston to rotate a crankshaft to be connected to a load such as a generator, there are provided an electric motor (actuator), a throttle valve opening/closing mechanism connected to the motor to open/close the throttle valve and a choke valve opening/closing mechanism connected to the throttle valve opening/closing mechanism to open/close the choke valve in response to operation of the throttle valve opening/closing mechanism, thereby enabling to move a choke valve without need to install an additional actuator.

Abstract: A valve unit for an internal combustion engine includes a duct, a valve and a shaft. The duct includes an inner tube defining a gas passage and an outer tube disposed radially outside of the inner tube. The duct has an annular liquid storage groove between the outer tube and the inner tube. The valve is supported by the shaft in the inner tube to control the gas passage The shaft is held by a bearing portion of the duct. The inner tube has an overflow portion and an overflow-restricting portion at an upper end. The overflow portion regulates a level of liquid stored in the storage groove and allows excess liquid to overflow from the storage groove. The overflow-restricting portion is provided in a predetermined area above the bearing portion and located higher than the overflow portion to restrict the liquid from overflowing from the predetermined area.

Abstract: A method of manufacturing a valve unit is disclosed that includes providing a plurality of injection molding dies that define a cavity corresponding in shape to the valve unit. The valve unit includes a housing and a valve, and the housing defines a fluid flow path with an axis having an upstream direction and a downstream direction corresponding to a predetermined direction of fluid flow in the fluid flow path. The valve is cantilevered and includes a valve body having a coupled end rotationally coupled to the housing and a free end, and the valve body rotates about the coupled end to thereby change flow through the fluid flow path. The method also includes simultaneously molding the housing and the valve within the cavity such that the valve body is formed with the free end extending away from the downstream direction of the axis of the fluid flow path.

Abstract: To stably maintain an opening degree characteristic of a driven lever, the driven lever (5) is attached to one end (3A) of a main throttle shaft (3) to which a main throttle valve (4) is attached, a cam lever (10) is attached to one end (8A) of a sub throttle shaft (8) to which a sub throttle valve (9) is attached, a cam surface (10A) of the cam lever (10) faces to a roller (5A) of the driven lever (5), a cup-shaped throttle cover (12) is arranged on one side wall (1A) of a throttle body (1), an opening portion (12C) of a throttle cover (12) is closed by a closing cover (20), and a lever storage chamber (22) formed by the throttle cover (12) and the closing cover (20) accommodates the cam lever (10) and the driven lever (5).

Abstract: A throttle assembly for intake air protects a link mechanism for interlocking throttles with each other from water and mud and maintains the throttle operability in a satisfactory state. The throttle assembly for intake air includes a plurality of throttle devices for injecting fuel into intake air to generate an air-fuel mixture; a link mechanism for connecting driving portions of the throttle devices with each other, a link mechanism housing chamber defined by an outer wall member for forming a link mechanism housing chamber and housing the link mechanism, and seal members provided at the connected or mated portions of the outer wall member and a different member or the connected or mated portions of a plurality of outer wall configuring members which configure the outer wall member.

Abstract: An electronic throttle control system is described. The system includes a non-contacting sensor stator integrated into an electronic throttle body and is aligned to the sensor rotor attached to the shaft to properly set sensor air gap by assembly aids or by close fit to the throttle body. A motor and vehicle connector is electrically connected to the sensor stator but is allowed to be positioned separately from the sensor stator by means of a flexible interconnect.

Abstract: A throttle valve control device for controlling an intake flow to an engine making it hard for a driver to hear return spring check sound and capable of detecting the failure of a return spring earlier by checking the return spring while the engine is operating and a throttle valve control method. To reduce the wear of the gears of the throttle valve control device, when a target throttle opening is controllably fully opened while the engine is operating, the control of a throttle valve is stopped. After the control of the throttle valve is stopped, it is checked whether or not a throttle sensor output value is equal to a throttle sensor output value at a throttle machine full open position.

Abstract: An outflow valve is disclosed for use in a pressure vessel. The outflow valve includes a dual wall valve housing having a central bore, a butterfly plate assembly and an angled drive shaft. The butterfly plate assembly is designed to fit and rotate within the central bore. The angled drive shaft has first and second ends rotateably coupled to the dual wall valve housing, and the angled drive shaft is attached to the butterfly plate. The drive shaft is designed to rotate the butterfly plate assembly between a closed position and an open position within the central bore.

Abstract: A valve unit for an internal combustion engine includes a duct, a valve and a shaft. The duct includes an inner tube defining a gas passage and an outer tube disposed radially outside of the inner tube. The duct has an annular liquid storage groove between the outer tube and the inner tube. The valve is supported by the shaft in the inner tube to control the gas passage The shaft is held by a bearing portion of the duct. The inner tube has an overflow portion and an overflow-restricting portion at an upper end. The overflow portion regulates a level of liquid stored in the storage groove and allows excess liquid to overflow from the storage groove. The overflow-restricting portion is provided in a predetermined area above the bearing portion and located higher than the overflow portion to restrict the liquid from overflowing from the predetermined area.

Abstract: To improve maintenance workability of fuel injection valves in multiple throttle bodies, a distribution member (D) is provided with a fuel distribution path (3) communicating with a fuel inflow path (8), throttle body mounting holes (7, 7) and injection valve support member mounting holes (6, 6), injection valve support members (S, S) are provided with injection valve support bosses (12, 12), the distribution member (D) is screwed to the one and other side throttle bodies (T1, T2) via the throttle body mounting holes (7, 7), the other side end surfaces (11, 11) of the injection valve support members (S, S) are screwed on one and the other side end surfaces (1, 2) of the distribution member (D), and the other and one side fuel injection valves (Ja, Jb) are held by the injection valve support members (S, S) and the other and one side throttle body (T2, T1) respectively.

Abstract: An intake control device for a vehicle engine includes: a throttle body; a main throttle valve configured to be opened or closed in response to an operation applied to a throttle grip, the main throttle valve being rotatably supported by the throttle body; a sub-throttle valve configured to be opened or closed under control of an actuator, the sub-throttle valve being rotatably supported by the throttle body; an intake air path formed in the throttle body and provided with the main throttle valve and the sub-throttle valve so as to open or close the intake air path; and a bypass air path that is different from the intake air path and provided with an idle speed control (ISC) valve that is controlled so as to open or close the bypass air path in conjunction with the sub-throttle valve.

Abstract: A variable geometry intake manifold for an internal combustion engine; the intake manifold presents: at least one intake pipe which connects the intake manifold to at least one cylinder of the internal combustion engine; and a choking system to vary the geometry of the intake manifold and comprising at least one choke valve provided with a choke body, which is arranged within the intake pipe and is turnably mounted about an axis of rotation; the choke valve integrates therein a pair of mechanical stoppers, which respectively determine the location of an active position and of a home position of the choke body.

Abstract: A throttle body includes a resin body (3) defining a bore (7) through which intake air flows, and a valve body (60) having a shaft part (20) rotatably supported by the body (3) via a pair of bearing members (24) and a resin valve part (4) for opening and closing the bore (7). End faces (67) of the valve part (4) slidably contacting with end faces (69) of the bearing members (24). The end faces (67) and (69) of at least one of the valve part (4) and the bearing members (24) slidably contacting with each other are formed to have a radius (69r) equal to or larger than a radius (68r) of paths of rotation (68) of radially outer ends (67a) of the end faces (67) of the valve part (4).

Abstract: The invention relates to a throttle plate port whose pivot axis is disposed so as to be axially offset with respect to the throttle plate and whose radial peripheral surface is shaped, at least by sections, in the form of spherical sectors, where in the position which closes the bore the peripheral surface of the throttle plate abuts, in the form of a line, the seat face of the housing. Through this type of eccentric disposition and simultaneous realization of the peripheral surface, the housing can be realized without undercuts and nonetheless precise dosing can be achieved in the case of small pivot angles.

Abstract: A method and a device are provided for operating an internal combustion engine, which make possible an improved characteristics curve correction of an actuator in an air supply of the internal combustion engine. In the process, an air mass flow supplied to the internal combustion engine is influenced via the actuator in an air supply. For the setting of an actuating position of the actuator having a specified, e.g., minimum, air mass flow, starting from a specified actuating position, the actuator is moved by an offset value of the actuating position. The offset value of the actuating position is corrected as a function of an offset value for the air mass flow.