Abstract: In the apparatus for controlling a coasting air recirculation valve of the turbocharger of an internal combustion engine, the coasting air recirculation valve is arranged in the coasting air recirculation line bypassing a compressor in the intake duct, and the coasting air recirculation valve is controllable by way of the intake duct pressure on the downstream side of the throttle valve. In order to ensure defined opening and closing of the coasting air recirculation valve, an additional control pressure, with which the coasting air recirculation valve can be opened independently of the intake duct pressure, can be delivered to the coasting air recirculation valve.

Abstract: A rotary-body type throttle valve for a spark ignition internal combustion engine is disclosed. The valve includes a valve casing, an intake passage formed with a rotary-body recess portion, a valve element having a rotary-body shape which is rotatably fitted into the rotary-body recess portion of the valve casing, and a communication passage that permits an upstream intake passage and a downstream intake passage to communicate with each other is formed in the valve element. The upstream intake passage and the downstream intake passage sandwich the rotary-body recess portion of the valve casing. A through hole which is directed from the communication passage of the valve element in a direction intersecting a central axis of the communication passage and reaches only one of rotary outer surfaces of the valve element is formed in the valve element. This arrangement results in a reduced flow resistance by decreasing the size and number of vortices generated during partially opened states of the valve element.

Abstract: A metal plate is made of a material having strength higher than a resin material for forming a throttle body and is disposed in the throttle body. The plate supports one end of a throttle shaft, fixes a shaft, and holds a motor. When the throttle body is made of a resin material, therefore, the rigidity of the throttle apparatus is enhanced and high dimensional accuracy among the throttle shaft, the shaft, and a rotary shaft can be assured.

Abstract: A hot water conduit is formed between an inner cylinder and an outer cylinder. A gasket seals an annular opening of the hot water conduit facing to a surge tank. Hot water is supplied into the conduit from an engine cooling water passage. Heat of the hot water is effectively transferred to the entire vicinity or surrounding of a throttle valve, thereby effectively avoiding icing phenomenon of the throttle apparatus.

Abstract: An electronic throttle apparatus permits aggregating of various parts and rationalization of installation, and can simplify assembling operation and wiring operation to an engine room for rationalization of an installation space. The throttle apparatus for an engine includes a throttle body housing therein a throttle valve and disposed in an air intake of the engine, a throttle actuating motor, a throttle position sensor detecting a throttle valve angle and an air flow sensor located on upstream of the throttle valve and measuring an intake air flow rate. The throttle actuating motor, the throttle position sensor and the air flow sensor are mounted on the throttle body.

Abstract: A disk-shaped throttle valve composed of an injection-molded resin having first main surface and a second main surface which are generally parallel includes a circular groove or semi-circular grooves centered on a gate resin portion where the resin is injected. The first main surface may also include a recess portion around the gate resin portion positioned such that the gate resin portion does not project beyond the first main surface. An accumulated resin portion may also be disposed on the second main surface opposite the gate resin portion, the accumulated resin portion being formed as a protrusion positioned such that an apex portion does not project beyond the second main surface.

Abstract: A shut-off device for progressive regulation of the flow rate of a fluid flowing in a pipe includes a main shut-off member which is able to pivot independently about a spindle passing through the pipe in order to close the latter, and at least one drive flap able to pivot about the spindle and act mechanically on the main shut-off member in such a way as to turn it about the spindle. The main shut-off member also being traversed by at least one orifice that can be closed by at least one shut-off flap, which flap can also pivot about the spindle, is integral with the drive flap and can regulate the rate of flow of the fluid through the orifice. The main shut-off member only begins to pivot about the spindle, from an initial closed position, when the drive flap is at a predetermined non-zero angular distance &phgr; from the said member, thus allowing the fluid to flow only through the orifice until the main shut-off member begins to open.

Abstract: A returning spring 7 of the electronic control throttle and a default spring 8 for securing an initial opening degree (default opening degree) of the throttle valve 3 have diameters different from each other, and both of the springs 7, 8 are held around a shaft of the throttle valve shaft 3 and arranged between a gear 43 attached to the throttle valve shaft 3 and a wall portion of the throttle body 100. A shaft supporting gap of the throttle valve shaft 3 is filled with an air leak preventing material, and a minimum opening degree on control purpose of the throttle valve is set to a value larger than an amount of overshoot of the throttle valve occurring when opening degree of the throttle valve is changed from a maximum opening degree on control purpose of the throttle valve to the minimum opening degree.

Abstract: In an intake passage arrangement in an internal combustion engine at least two intake ports located in a cylinder head depart from a common intake flow path. In the area where the flow path branches into the separate intake ports a swirl control device configured as a control flap is positioned, which is rotatable about a rotation axis situated at one end of the control flap. In one position the control flap opens both intake ports, whereas it blocks one intake port in another position. To ensure control of the swirl motion of the intake flow entering the combustion chamber and to permit a most simple and compact design an intermediary part carrying the control flap is essentially configured as a thin, flat frame, and preferably as a die-cast part made of aluminum.

Abstract: A disc type throttle stop selectively regulates the power of an internal combustion engine by controlling the flow between an air metering device and the intake valves and presents substantially no restriction to the flow in the full open position of the throttle stop at wide open throttle conditions of the engine.

Abstract: A throttle valve for throttling the combustion air flow for an internal combustion engine is disclosed, having a body with a throat, a butterfly in the throat to throttle flow, and a shaft connected to the butterfly to operate it. The shaft has an arm that abuts a throttle stop to maintain the butterfly in an almost-closed (or idle) position. The arm has an opening that permits access to the head of the throttle stop to adjust the throttle stop when the throttle valve is in the almost-closed position. The opening is located so that a tool such as a hex wrench can pass through the opening and engage a socket in the head of the throttle stop, pemitting it to be rotated and adjusted. The throttle shaft and arm are preferably integrally molded of plastic, and the throttle stop head is preferably larger than the threaded shaft of the throttle stop.

Abstract: A throttle valve is rotatably mounted to a throttle body through a throttle shaft. An internal bore shape of the throttle body is of a straight bore type having a shape in which the center of rotation of the throttle valve is placed on the central line of the throttle body. Spherically-shaped internal profile portions are provided in an idle control region lying in the neighborhood of a fully-closed angle of the throttle valve. Further, spherically-shaped internal profile portions are provided as regions following the spherically-shaped internal profile portions referred to above. Moreover, regions each formed by a spherical shape and a composite surface profile of a cylindrical surface substantially parallel to the flow of intake air or regions each formed by a conical surface profile are provided as regions following the spherically-shaped profiles. Incidentally, the center of each spherical profile is offset on the central line of the bore in upward and downward directions.

Abstract: An inlet manifold/throttle valve chamber unit for a vehicle comprising a heat engine, is characterized in that a module (2) for adjusting the passage cross section is attached in the region of the fresh air feed orifice (3) of an inlet manifold (1) so as to form an integrated inlet manifold/throttle valve chamber unit.

Abstract: A throttle body (61) has a first body part (62) containing an upstream portion of a through-bore (68) and a second body part (64) containing a downstream portion of the through-bore. The two body parts are joined together to register the downstream portion of the through-bore as a continuation of the upstream portion at respective confronting faces of the two body parts. A throttle mechanism (92) is captured between the two body parts. The mechanism includes a torsion spring (78) external to the through-bore having tails (78A, 78B) respectively associated with formations in the exterior of the throttle body and in a cam on the shaft for spring-biasing a throttle blade (70) of the mechanism that is disposed within the through-bore to closed position.

Abstract: A portion of a throttle valve at which the throttle valve is fixed on a throttle valve shaft is formed as a thick portion, and the throttle valve has an outer peripheral portion of at least one of an internal combustion engine side and an air intake side formed with a gradually thinned portion which is formed so as to be gradually thinned toward an intake pipe wall than the thick portion.

Abstract: An electronic throttle valve for an engine includes a throttle plate with upper and lower reliefs that allows for tight closed in bore sealing and allows the throttle plate to rotate past the maximum airflow position. A unidirectional spring force is used to reduce feedback control problems.

Abstract: In a throttle valve control device 11, which controls a throttle valve 14 to rotate in a normal direction from a fully closed position S to a fully opened position F or in a reverse direction from the fully opened position F to the fully closed position S in order to open or close an air intake passage 20 of an engine, there are provided a return spring 19 for urging the throttle valve 14 in the reverse rotation direction and an adjustment screw 25 for causing the throttle valve 14 to stop in a predetermined position when the valve 14 is rotated by a predetermined angle .theta. in the reverse rotation direction from the fully closed position S to the predetermined position.

Abstract: A throttle body (61) has a first body part (62) containing an upstream portion of the through-bore (68) and a second body part (64) containing a downstream portion of the through-bore. The two body parts are joined together to register the downstream portion of the through-bore as a continuation of the upstream portion at respective confronting faces of the two body parts, capturing at least one bearing assembly (94) of a throttle mechanism between the confronting faces to thereby journal a throttle shaft (72) on opposite wall portions of the throttle body. The two body parts also contain a by-pass air passage (114). In one form (FIGS. 1 and 2) an idle air control valve (58) associates with the by-pass passage; in another (FIGS. 3 and 4), an electric motor actuator (167) associates with the passage and with the throttle shaft.

Abstract: An internal combustion engine with charge stratification and directed air flow is provided. A charge motion control valve is positioned in the upper intake manifold and bifurcated intake ports are utilized in the cylinder head which direct the air flow into one intake port when desired. This provides improved engine performance, emissions, and fuel economy with easier packaging and consequently reduced cost.

Abstract: There is disclosed an intake control valve device for an internal combustion engine in which a high sealing effect of a valve can be achieved even if dispersions in the machining precision etc. of the valve, a valve shaft and other portions as well as thermal strain deformation of these parts cause. The intake control valve device includes a butterfly-type valve provided in an intake passage in a body. A valve seat surface, which can face an outer peripheral portion of an upstream-side surface of the valve at one half-periphery portion of the valve, disposed on one side of a valve shaft, is formed on the body, and another valve seat surface, which can face an outer peripheral portion of a downstream-side surface of the valve at another half-periphery portion of the valve, disposed on another side of said valve shaft, is formed on the body. The angle .theta..sub.3 of inclination of each of the two valve seat surfaces is larger than the angle .theta..sub.

Abstract: An electronic throttle valve for an engine includes a throttle plate with upper and lower reliefs that allows for tight closed in bore sealing and allows the throttle plate to rotate past the maximum airflow position. A unidirectional spring force is used to reduce feedback control problems.

Abstract: A throttle valve assembly for an internal combustion engine includes a throttle body having a bore formed therein and a sidewall having a throttle shaft opening formed therethrough. A throttle shaft passes through the throttle shaft opening and includes a shaped end. A disc shaped retainer is positioned within the opening and has a corresponding shaped opening for receiving the shaped end of the throttle shaft. When the shape end of the throttle shaft passes through the shaped end of shaped opening of the retainer, the throttle shaft is rotated relative to the retainer to create an interference engagement therewith so as to retain the throttle shaft within the throttle body to limit axial displacement thereof.

Abstract: A throttle valve includes a one-piece valve body defining a transverse flow passage and an actuation device cavity. The throttle valve includes a valve assembly having a shaft which extends through the flow passage and which is mounted to the valve body via a pair of aligned passages formed in the walls of the valve body defining the flow passage. One of the aligned passages establishes communication with the actuation device so as to enable the valve shaft to be assembled to the valve body through the actuation device cavity. A pole carrier is mounted to the valve shaft and a pair of pole members are secured to the pole carrier. An electromagnetic actuation device is mounted within the actuation device cavity and is operable on the pole members in a contactless manner to impart rotation to the valve shaft through the pole members and the pole carrier upon energization of a coil assembly associated with theelectromagnetic actuation device.

Abstract: In an air intake system of a multi-cylinder internal combustion engine with exhaust gas recirculation, particularly a Diesel engine, including an intake duct with a throttle valve wherein the intake duct is connected to an intake manifold of the engine and an exhaust gas recirculation conduit is connected to the intake duct downstream of the throttle valve, the throttle valve includes a valve member provided with a turbulence plate which has a diameter smaller than the valve member and extends normal to the valve member, and the valve member has passages and the turbulence member has holes for generating turbulence in the intake duct downstream of the throttle valve.

Abstract: An electronic throttle apparatus permits aggregating of various parts and rationalization of installation, and can simplify assembling operation and wiring operation to an engine room for rationalization of an installation space. The throttle apparatus for an engine includes a throttle body housing therein a throttle valve and disposed in an air intake of the engine, a throttle actuating motor, a throttle position sensor detecting a throttle valve angle and an air flow sensor located on upstream of the throttle valve and measuring an intake air flow rate. The throttle actuating motor, the throttle position sensor and the air flow sensor are mounted on the throttle body.

Abstract: In a resin-made throttle body for controlling air flow rate in an air intake passage, orientation of resinous material of a wall of the throttle body surrounding the valve member has a step portion for controlling orientation of fiber-including resinous material. As a result, the inner periphery of the wall can expand or contract evenly as the valve member expands or contracts.

Abstract: A method of operating a two-cycle internal combustion engine under low load conditions. A throttle is placed at the intake air system to reduce air intake into the engine cylinders. A pump is placed in the exhaust system, such that it creates reduced pressure downstream of the exhaust valves. In this manner, when the air intake ports close, the exhaust is evacuated and the air trapped in the cylinder is reduced. This permits fuel to be reduced so that the engine may operate in a low load state without losing combustion.

Abstract: The governor for a gasoline engine is a roller-shaped rotary slide valve (8a, 8b)which permits precise adjustment of the quantity of gas-air mixture supplied to the combustion chamber. The actuation forces for operating the rotary slide valve (8a, 8b) are lower than previously used throttle valves, which permits use of a smaller and less expensive control device for operating the valve.

Abstract: A throttle valve body (1) including a flap (6) of which the side pivoting down or up on opening has a shoulder (17) on the flap surface facing upwards or downwards, respectively, defining a gradually widening cross-sectional area with the cylindrical (7) or frusto-conical (9) wall opposite the intake channel (3) through the housing (2). The side of the flap (6) which rotates up or down, respectively, on opening consists of a flat half disk of which the edge is , at first, opposite a tapered surface portion (14) with a complex shape to define a gradually widening cross-sectional area downstream from an inlet convergent (15,12) and upstream from an outlet divergent, respectively.

Abstract: An apparatus for controlling an opening of a throttle valve to adjust an amount of air flow led into an internal combustion engine mounted on a vehicle. A depression sensor detects the degree of depression of an accelerator pedal. An electric component is provided for electrically adjusting the opening of the throttle valve based on the depression of the gas pedal. A mechanical component is provided for adjusting the opening of the throttle valve in response to the depression of the accelerator pedal. The mechanical component is rendered operable when the electric component fails to control the opening of the throttle valve. An electric control unit (ECU) prohibits the electric component from resuming control of the throttle valve until a certain condition is met, such as stoppage of the engine or the entire vehicle, even if the electric component is capable of controlling the throttle valve.

Abstract: A throttle body and bracket assembly permits the joining of the bracket to the throttle body without fasteners by incorporating preselected and complementary geometries on a mating portion of the bracket and on a portion of the throttle body. These mating portions, which may be in the form of a dovetail-type configuration, may be fit together in locking fashion, and the bracket may be further held in place by securing a lip or retainer portion of the bracket between the free ends of the air hose and the throttle body when they are joined. Additionally, a throttle body may be molded to include an idle air by-pass passage having an open, exterior surface that is sealed by the mating portion of the bracket when it is placed in its mated position with the throttle body.

Abstract: An air control valve for an engine includes a throttle body defining an air intake passage and a throttle valve rotatably mounted in the passage. The range of valve rotation includes an idle control portion extending from a minimum air flow position to an intermediate air flow position and a power control portion extending from the intermediate air flow position to a maximum air flow position. The intake passage is defined by an internal wall of the throttle body having a pair of arcuate surfaces spaced from the valve periphery, at a maximum first radius from the valve axis, with gradually increasing clearance on opposite sides of the valve axis in the idle control range from the minimum to the intermediate air flow position of the valve. The arcuate surfaces are defined by second and third radii greater than the maximum first radius and centered on second and third axes spaced laterally of the passage a predetermined offset distance beyond the valve axis relative to their respective surfaces.

Abstract: A throttle device comprises a throttle valve having a circular body and a compensation member made of resin. The body has an upstream half rotatable at an upstream side with respect to a throttle shaft and a downstream half rotatable at a downstream side with respect thereto. The compensation member is installed on the upstream half at a downstream side thereof and bulged toward an inner wall of a throttle body. When the throttle valve rotates in an open direction from a closed position, the area of an intake air passage at the upstream half is smaller than the area of a passage at the downstream half and thus, the difference between the flow velocity at the upstream half and that at the downstream half can be reduced. Accordingly, it is possible to restrict the flow of the intake air from becoming oblique to the axis of the intake air passage and hence measure the flow rate of the intake air accurately.

Abstract: Shut-off device for progressive regulation of the flow rate of a fluid flowing in a pipe (1), comprising(a) a main shut-off member (3) able to pivot independently about a spindle (4) passing through the pipe and close the latter, and(b) at least one drive flap (5) able to pivot about the spindle (4) and act mechanically on the main shut-off member (3) in such a way as to turn it about the spindle (4); the main shut-off member (3) also being traversed by at least one orifice (6) that can be closed by at least one shut-off flap, which flap can also pivot about the spindle (4), is integral with the drive flap (5) and can regulate the rate of flow of the fluid through the orifice; the main shut-off member (3) only beginning to pivot about the spindle (4), from an initial closed position, when the drive flap (5) is at a predetermined non-zero angular distance .o slashed. from the said member, thus allowing the fluid to flow only through the orifice (6) until the main shut-off member (3) begins to open.

Abstract: An apparatus for controlling a throttle valve electronically in an internal combustion engine comprises a throttle valve with a rotation axis disposed in an intake air passage of an internal combustion engine, and an actuator with two ends and a central body disposed in parallel with the rotation axis of the throttle valve and extending back part way along the length of the throttle valve, and a casing formed around the throttle valve and the actuator, but not covering the central body of the actuator to thereby allow a mold for the casing to be slidably removed in a direction at approximately a right angle to the rotation axis.

Abstract: An inlet arrangement is provided for a multi-cylinder internal combustion engine. Each cylinder has an air inlet passage and a pair of inlet valves. A control flap is disposed within the inlet passage of one of the cylinders, the flap being pivotable about a pivot axle. The axle is disposed transverse to the length of the inlet passage. The flap has an operative position in which swirling of the air occurs and a starting position. The flap has a pair of wings provided on opposite sides of the pivot axle. The control flap has a base profile substantially corresponding to the internal profile of the inlet passage and a base area. One of the wings has a greater base area than the second of the wings. The first wing has a recess adjacent to the outer circumference of the wing. The recess, in the starting position of the control flap, faces away from direction from which the air flows.

Abstract: A spring assembly in a throttle valve connection for control of combustion air to an internal combustion engine, in which a rotor is movable in opposite directions to control flow of combustion air. The spring assembly has a coil spring with first and second legs at respective opposite ends engaging housing and rotor parts. The housing and rotor parts are provided with respective oblique surfaces engaging one of the legs of the spring when the spring is relaxed to resist relative rotation of the housing and rotor.

Abstract: Throttle body in which on the internal wall of the feed pipe there is provided at least one channel the base of which defines together with external edge of the butterfly valve at least one limp-home flow and in which on the internal wall of the feed pipe there is provided a curvilinear section, adjacent to the channel, the base of which defines together with the external edge of the butterfly valve at least one idling flow.

Abstract: A throttle body assembly for an internal combustion engine comprising a straddle-mounted throttle plate shaft extending transversely through an airflow passage, a bearing located on each side of the airflow passage for rotatably supporting the throttle plate shaft, and a mechanical connection between the throttle plate and the throttle plate shaft including strategically positioned clearances between the shaft and the throttle plate which will allow the throttle plate to move relative to the shaft, thereby permitting self-alignment of the throttle plate within the airflow passage.

Abstract: An air intake system for an internal combustion engine. The air intake system includes an intake manifold (24) with a throttle body (22) mounted thereto. The intake manifold (24) and throttle body housing (26) are both formed primarily from a plastic or composite material. A snap-fit joint secures the throttle body (22) to the intake manifold (24). The joint includes a pair of mounting flanges (46,48), with the throttle body flange (46) including a set of lugs (54), and the manifold flange (48) including cutouts (56) and ramps (58) for receiving the lugs (54). The throttle body flange (46) also includes a loop hook (76) and gasket (52), which mate, respectively, with retention surfaces (84) and a sealing surface (70) on the manifold flange (48). The throttle body (22) also includes a main bore extension (62) with pilots (66) that mate with an entrance region (68) in the manifold (24).

Abstract: A combustion engine throttle valve includes a multipiece clamshell throttle body which is divided along an axis of rotation of a throttling member subassembly, which may be placed within the throttle body as one component. The throttle body further includes a face sealing ledge within the throttle body's air conduit, with the ledge being positioned so that the throttle plate will be in contact with the ledge when the plate is in the closed position, and such that the plate pivots perpendicularly off the ledge when opening. The clamshell design permits greater use of lighter plastics in place of metallic components and minimizes the number of parts through incorporation of plastic injection molding techniques.

Abstract: An internal combustion engine having a cylinder and piston located therein has a charge motion control valve for controlling kinetic energy within an air charge flowing through an intake runner and into the cylinder of the engine. The charge motion control valve includes an actuator for controlling the position of the valve and an aerodynamic, wing-shaped valve disc being rotatable from a closed position to one or more open positions. The valve disc has leading and trailing segments. The leading segment masks airflow at small opening values of the valve and the trailing segment acts to prevent flow separation when the valve is in a wide-open throttle position.

Abstract: A joint structure connected to an air intake passage is composed of a throttle body having a set of a groove and a chamfered surface formed on an outer surface thereof diagonally opposite to each other and a joint member having a flexible arm and a rigid arm. The flexible arm has a ridge in engagement with the groove of the throttle body, and the rigid arm has a sloped surface in engagement with the chamfered surface of the throttle body.

Abstract: An evaporative emissions control system for carburetors used in the internal combustion engines of vehicles, such as motorcycles, has an evaporative emissions control valve attached to the carburetor in the air intake path to the carburetor. The evaporative emissions control valve may be implemented as a sub-assembly add-on or as an integral part of a carburetor or back plate. The evaporative emissions control valve includes a valve, such as a rotatable plate valve, which may be electrically operated by an electrical actuator, such as a dual-wound solenoid actuator. At engine start-up, when the vehicle ignition switch and starter switch are both closed, both windings of the solenoid actuator are energized to provide a strong opening force for the evaporative emission control valve. During steady-state running of the engine, only a single solenoid winding is energized by the power provided through the ignition switch, to maintain the evaporative emissions control valve in the open position.

Abstract: An internal combustion engine having at least one variable volume combustion chamber with an intake passage leading thereto, an ignition element for igniting an air/fuel mixture in the chamber, an exhaust passage leading therefrom and including a catalyst in communication therewith, and an emission control for controlling the emission content is disclosed. Preferably, the emission control comprises a mechanism for closing the intake passage leading to the chamber in the event an engine abnormality is detected and an engine ignition misfire mode is employed, thereby preventing the emission of unburned air and fuel into the exhaust passage leading to the catalyst.

Abstract: A throttle valve system comprising at least: a throttle valve housing component (98); a throttle valve spindle component (99), on which a throttle valve component (100) is arranged and which is fitted so as to move at least in a gas mixture cavity (103) in the throttle valve housing component; a throttle valve drive unit (91) and an angle sensor unit (93), which are connected at least partially with the throttle valve spindle component (99), and an electronic control unit (7,8), which are enclosed, by the throttle valve housing component (98); a temperature sensor unit (94); and a valve unit (95). The valve unit (95), the throttle valve drive unit (91), the angle sensor unit (93) and the electronic control unit (7,8) are enclosed by the throttle valve housing component (98). The valve unit (95) is connected to the gas mixture cavity (103) via a fuel vapor recess (102) passing through the throttle valve housing component (98).

Abstract: An air intake system for an internal combustion engine. The air intake system includes an intake manifold (24) with a throttle body (22) mounted thereto. The intake manifold (24) and throttle body housing (26) are both formed primarily from a plastic or composite material. A snap-fit joint secures the throttle body (22) to the intake manifold (24). The joint includes a pair of mounting flanges (46,48), with the throttle body flange (46) including a set of lugs (54), and the manifold flange (48) including cutouts (56) and ramps (58) for receiving the lugs (54). The throttle body flange (46) also includes a loop hook (76) and gasket (52), which mate, respectively, with retention surfaces (84) and a sealing surface (70) on the manifold flange (48). The throttle body (22) also includes a main bore extension (62) with pilots (66) that mate with an entrance region (68) in the manifold (24).

Abstract: A resin air intake system provided with an intake control valve which permits simplifying the mold structure and maintaining axis center precision. In an air intake manifold, air intake passages are fabricated to be opened and provided with an intake control valve supported by a shaft having an axis in a direction perpendicular to the axes of the openings. The air intake manifold is molded from a resin as an air intake manifold proper and an air intake manifold cluster which have split faces, the split face of the air intake manifold proper provided with grooves in a direction perpendicular to the axes of the openings. Bearings which slidably support the shaft are mounted in the grooves and a projection which projects from the split face of the air intake manifold cluster is brought into contact with the bearings.

Abstract: A variable air intake device for an internal combustion engine includes a first manifold, air intake pipes for connecting the first manifold to individual cylinders of the internal combustion engine to supply intake air, and a second manifold connected to the air intake pipes. The second manifold has a portion between the first manifold and the cylinders. The portion has further mutually closely adjacent air intake pipes. The further air intake pipes have walls with mutually adjacent ports and the further air intake pipes have bearing collars. A closing device has shafts and closing elements in the form of elongate bodies in the vicinity of the bearing collars. Each of the elongate bodies is rotatably mounted as a flap on a respective one of the shafts for closing and opening the ports as a function of a parameter of the internal combustion engine.

Abstract: An induction system for a multi-valve internal combustion engine including a control valve arrangement for redirecting the flow into the combustion chamber through a relatively small displaced bypass passageway under certain running conditions so as to provide a high velocity flow into the combustion chamber even though the total air flow is small. The flow is also directed so as to generate a slant-type tumble motion in the combustion chamber to further increase the turbulence and improve combustion under the running conditions when the control valve is in its flow restricting flow redirecting position. The bypass passage has a relatively regular configuration with a low peripheral length to cross-sectional area ratio so as to provide a compact overall assembly and to facilitate manufacturing. In the open position, the control valve offers substantially no restriction to air flow so that high power outputs can be achieved while still maintaining good running under low-speed, low-load conditions.