Abstract: There is provided an air cleaner configured to be disposed inside a vehicle body frame, the air cleaner including: an air cleaner case in which an intake chamber is formed; an intake air temperature sensor configured to detect an intake air temperature in the intake chamber; an inlet tube configured to take in air to the intake chamber; and an outlet tube configured to send out air from the intake chamber. The outlet tube has an upstream portion protruding into the intake chamber, and the upstream portion of the outlet tube has a peripheral wall formed with a through hole.

Abstract: An intake system of an engine including an intake manifold, which includes an intake air introducing pipe and a plurality of independent intake pipes, is provided. Each of the independent intake pipes has an arc shape surrounding the intake air introducing pipe from outside with a space. A first independent intake pipe is curved more in the cylinder lined-up direction than a second. From the side in the cylinder lined-up direction, the arc shape of the second independent intake pipe is more distant from the intake air introducing pipe. To a first member constituting part of the intake air introducing pipe, a second member is joined to form the arc shape of the first independent intake pipe. A third member disposed radially outward from the first member is joined to the second member to form the arc shape of the second independent intake pipe.

Abstract: An EGR gas distributor for distributing EGR gas to branch pipes of an intake manifold includes a plurality of gas distribution passages arranged side by side for the branch pipes, a gas inflow passage and a gas chamber to deliver the EGR gas to each of the gas distribution passages. The gas inflow passage includes two, first and second, gas passage parts branched in a single stage. When the EGR gas distributor is mounted on the intake manifold, a passage cross-section of each gas passage part perpendicular to a central axis has an uppermost vertex and a lowermost vertex. The passage cross-sections of the gas passage parts are sized such that their lengths in a vertical direction are gradually longer from an upstream side of the first gas passage part to a downstream side of the second gas passage part.

Abstract: Cross-port air flow that improves engine fuel economy and reduces pumping losses during part-throttle operation can be implemented in various types of internal combustion engine systems using ports that interconnect the intake ports of different cylinders, thus allowing different cylinders to share combustion air. Cross-port air flow is commenced during part-throttle engine operation to disrupt the primary combustion air flow from each throttle to its associated cylinder, which reduces charge density and engine power. The engine compensates for the reduced power by incrementally opening the throttles, thus increasing the primary combustion air flow, reducing pumping losses and improving fuel economy.

Abstract: An air intake apparatus includes an air intake apparatus body including an intake passage and a detection bore, a sensor holding portion holding a sensor, a pipe member constituted by an elastic member and including a first end and a second end, the first end being connected to the detection bore and the second end being connected to the sensor holding portion, the sensor holding portion including a fitting portion which includes an inner peripheral portion contactable with an outer peripheral portion of the second end, the sensor and the pipe member being fixed to the sensor holding portion by a contact of the outer peripheral portion of the second end with the inner peripheral portion of the fitting portion in a state where an insertion portion of the sensor is inserted to be positioned within the second end of the pipe member to widen the second end.

Abstract: An example system includes a vehicle having a propulsion system, an electric generator, a cooking apparatus, and a fuel storage apparatus configured to store compressed natural gas (CNG). The system also includes a fuel regulation apparatus coupled to the fuel storage apparatus and configured to deliver CNG to the electric generator, the propulsion system, and the cooking apparatus. The system also includes an air intake system configured to intake air from an ambient environment via an intake port, and supply the air to at least one of the propulsion system or the electric generator. The system also includes an exhaust system configured to expel exhaust air from at least one of the propulsion system or the electric generator into the ambient environment via an exhaust port. The intake port is physically separated from the exhaust port.

Abstract: Cross-port air flow that improves engine fuel economy and reduces pumping losses during part-throttle operation can be implemented in various types of internal combustion engine systems using ports that interconnect the intake ports of different cylinders, thus allowing different cylinders to share combustion air. Cross-port air flow is commenced during part-throttle engine operation to disrupt the primary combustion air flow from each throttle to its associated cylinder, which reduces charge density and engine power. The engine compensates for the reduced power by incrementally opening the throttles, thus increasing the primary combustion air flow, reducing pumping losses and improving fuel economy.

Abstract: An intake apparatus of an internal combustion engine includes an intake apparatus main body including plural intake pipes being connected to cylinders of the internal combustion engine, respectively, the internal combustion engine having the plural cylinders, and an external gas passage distributing an external gas to each of the plural intake pipes. The intake apparatus main body is formed such that plural pieces being formed so as to be divided from one another is joined with one another, and the plural intake pipes are formed so as to be curved. The external gas passage is disposed at an inner circumferential side of the plural curved intake pipes, the external gas passage being provided at a joint surface of the plural pieces constituting an inner circumferential part of the plural curved intake pipes.

Abstract: A family of manifolds for a family of engines. A first and second engine respectively have a first and second number of cylinders. The second number is at least one and smaller than the first number. Each manifold has a plenum chamber and an inlet. The first and second manifolds respectively have the first and second number of outlets, each connected to one of a first number of runner passages. The first manifold is manufactured by inserting an outlet insert for forming at least one of the first number of outlets into a first or second mold, forming a first portion thereof using the first mold, forming a second portion thereof using the second mold, and connecting the portions. The second manifold is manufactured by forming a first portion thereof using the first mold, forming a second portion thereof using the second mold, and connecting the portions.

Abstract: An intake apparatus includes an intake apparatus body including a plurality of intake pipes and a distribution passage including a gas passage before branching which includes a first gas passage through which the external gas flows in a first gas flow direction and a second gas passage through which the external gas flows in a second gas flow direction, the second gas passage curving relative to the first gas passage at a downstream, and a gas passage after branching including a third gas passage branched in the first gas flow direction relative to the second gas passage and a fourth gas passage branched in an opposite direction from the first gas flow direction relative to the second gas passage, an angle formed between the second gas passage and the third gas passage is smaller than an angle formed between the second gas passage and the fourth gas passage.

Abstract: An outboard motor unit includes an outboard motor including a cowling and an engine housed in the cowling and that is mounted on a vessel body, a supercharger that compresses air, and a compressed air cooler that is installed outside the cowling of the outboard motor and cools air compressed by the supercharger.

Abstract: Vehicle engine systems and inserts for such systems are presented. The insert can be positioned between an air intake system and a cylinder bank of an engine. In some arrangements, the insert can be positioned such that a first abutment surface directly contacts portions of a surge tank and a second abutment surface directly contacts portions of a cylinder head cover. The insert can be constructed, positioned, and/or oriented to absorb or transfer forces acting upon the engine system during impacts. For instance, the insert can be arranged such that it extends between the surge tank and the cylinder head cover along an axis that is substantially parallel to a predetermined force direction of a predetermined impact force.

Abstract: Vehicle engine systems and load path brackets for such systems are presented. The load path brackets can be positioned between an air intake system and a cylinder bank of an engine. In some embodiments, the load path brackets can be operatively connected to a surge tank at a first end and to a cylinder head cover at a second end. The load path brackets can be constructed, positioned, and/or oriented to absorb or transfer forces acting upon the engine system during impacts. For instance, the load path brackets can be arranged such that a longitudinal axis of a portion of load path bracket is positioned based on a predetermined force direction of a predetermined impact force.

Abstract: An air intake assembly configured to direct air into a throttle body of an engine of an automotive vehicle includes an air cleaner enclosure, primary and secondary air intake ducts and a downstream air intake duct. In a first operating condition, inlet air is directed into the air cleaner enclosure unit from the secondary air intake duct and routed (i) through the downstream air intake duct and into the throttle body and (ii) through the primary air intake duct and out of a primary air inlet. In a second operating condition, inlet air is directed into the air cleaner enclosure unit from the primary air intake duct and routed (iii) through the downstream air intake duct and into the throttle body and (iv) through the secondary air intake duct and out of the secondary air inlet. A method of directing the intake air into the throttle body is also provided.

Abstract: Output performance of the engine may be maximized by a configuration in which air is supplied so as to maximize volumetric efficiency of the respective cylinders in a multi-cylinder engine including a plurality of cylinders.

Abstract: An intake system includes an intake passage for leading intake air to an internal combustion engine; an air cleaner connected to the upstream side end portion of the intake passage. A pressure sensor measures pressure of intake air in the intake passage. An air cleaner case includes a case main body mounted to the upstream side end portion of the intake passage. A cover portion closes the case main body. The intake system includes a throttle body constituting part of the intake passage and having a throttle valve. The pressure sensor is mounted to a support portion extending outward from the case main body and is connected to the downstream side of the throttle valve.

Abstract: The invention addresses a challenge for providing an intake manifold that is able to suppress interference of the intake manifold with fuel injection valves at the time of a collision of a vehicle. In an intake manifold, joint faces and joint portions are connected to each other such that lines extended from the joint faces of flange portions and joint faces of the joint portions are oriented toward positions clear of fuel injection valves. In the intake manifold, each joint portion is formed such that a length of the joint face in a direction in which the joint face extends is longer than a maximum spaced distance between the corresponding fuel injection valve and the corresponding flange portion.

Abstract: The invention relates to a gas distribution manifold (3) in the cylinder head (4) of a heat engine of a motor vehicle, said manifold (3) comprising a manifold housing (31) provided with an inflow face for the inflow of an admission gas (G) and an outflow face (3B) entering the cylinder head of the engine, in such a way as to enable the circulation of the admission gas flow in the downstream direction in the manifold housing (31); and means for injecting a recirculated exhaust gas flow (H) of the engine into the admission gas flow (G). Said injection means are formed in the manifold in such a way that the recirculated exhaust gas flow is injected in a counter-flow to the admission gas flow.

Abstract: An air filter assembly for use with an internal combustion engine is provided. The air filter assembly includes a casing having an inlet configured to receive air from the environment, the casing having a passage, and an outlet disposed downstream the passage. A collection chamber collects particles from the drawn air. The collection chamber is disposed downstream from the inlet and upstream from the outlet. A partition is disposed between passage and the collection chamber. The partition has openings configured to allow particles to pass through. A side port is downstream the partition and in fluid communication with the passage. An internal combustion engine utilizing the air filter assembly is also provided. The internal combustion engine includes an air manifold, a combustion chamber and a filter. The air filter assembly is disposed upstream the filter.

Abstract: A motorcycle includes a body frame, an engine, a lead-in duct, and an air cleaner case. An air cleaner includes a convex cleaner element protruding in a direction opposite to a direction extending toward the lead-in duct, and a convex support frame that supports the inner surface of the cleaner element. The support frame includes an outer frame that supports a periphery of the cleaner element. The cleaner element includes a convex element body and a seal provided adjacent the peripheral edge of the element body to project toward the inner surface of the element body so as to work together with the periphery of the element body to hold the outer frame. The periphery of the element body has a smaller thickness than the other portions of the element body.

Abstract: A casing structure of an automotive internal combustion engine includes an upper/lower divided crankcase structure. A crankshaft and a first transmission shaft of a pair of transmission shafts parallel to the crankshaft of a transmission are axially supported by a dividing surface of the upper crankcase and the lower crankcase. The dividing surface of the crankcase is inclined so that a second transmission shaft axially supported by the upper crankcase above the first transmission shaft is below the crankshaft. A cylinder is formed on the upper crankcase so that a cylinder axial line is orthogonal to the dividing surface.

Abstract: An intake apparatus of an engine includes: a first intake passage supplying fresh air to a cylinder; a second intake passage arranged near the first intake passage, and supplying fresh air to the cylinder; a first intake valve opening and closing the first intake passage at an aperture of the first intake passage; a second intake valve opening and closing the second intake passage at an aperture of the second intake passage. An opening timing of the first intake valve of the intake apparatus advances relative to a top dead center, and a valve lift amount of the first intake valve differs from that of the second intake valve, and there is a period while the valve lift amount of the first intake valve is larger than that of the second intake valve, in an intake stroke.

Abstract: An engine assembly generally includes an engine and an intake manifold. The engine includes a plurality of cylinders. The plurality of cylinders includes a pair of cylinders. The engine is configured to sequentially fire the pair of cylinders. The intake manifold defines a plurality of ports. Each port is in fluid communication with one of the plurality of cylinders. The plurality of ports includes a pair of ports. Each of the pair of ports is disposed in fluid communication with one of the pair of cylinders. The intake manifold further includes a baffle disposed between the pair of ports to restrict fluid flow within the intake manifold between the pair of ports.

Abstract: An intake manifold is provided with a chamber member provided with an exhaust port and a chamber formed therein, a port member provided with an intake groove forming a ventilation passage bent so as to be communicated with the exhaust port and the chamber of the chamber member when the chamber member and the port member are welded together, and a cover member that covers the port member from a side opposite to the welded side between the chamber member and the port member. The intake groove has an outer wall surface opposing to the chamber member is formed with a reinforcing member so as to protrude from at least one of the port member side or chamber member side toward another one thereof, and the reinforcing member extends along an extending direction of the intake groove, the reinforcing member is welded to another reinforcing member protruding from another outer wall surface of the port member and chamber member, or from the port member and the chamber member.

Abstract: Various systems for reducing noise, vibration, and harshness in an intake manifold are provided. In one example, an intake manifold includes one or more runners, a plenum fluidically coupled to the one or more runners, an inlet having a wall thickness, and a first and a second indentation, where the first indentation protrudes radially inward at a first inflection point in a first direction, the second indentation protrudes radially inward at a second inflection point in a second direction substantially anti-parallel to the first direction, and the wall thickness is maintained at the first and second inflection points. In this way, noise, vibration, and harshness associated with the intake manifold and its inlet may be reduced without additional weight, cost, or complexity.

Abstract: An intake manifold assembly for mounting to a cylinder head and configured to deliver combustion air thereto comprises a centrally positioned zip tube having an opening for receipt of combustion air from a throttle body. First and second flow runners extend from the centrally positioned zip tube to terminate at a common intake manifold plenum for delivery of combustion air thereto. A centrally located access opening is defined between the first and second flow runners.

Abstract: A mounting device can mount an intake manifold to an engine and includes a bending moment applying device applying a bending moment to the intake manifold as the intake manifold is mounted to the engine.

Abstract: Embodiments in accordance with the present disclosure may provide an intake manifold that may include a plastic shell defining an intake passage in fluidic communication with a runner configured to pass inlet air to a combustion chamber. The runner may have a substantially flat inner surface. The intake manifold may also include one or more ribs disposed along the inner surface. The one or more ribs may have a length extending along a portion of the inner surface in a direction substantially corresponding to a flow direction in order to reduce NVH while maintaining reducing overall volume of the manifold.

Abstract: An intake system is provided. The intake system including an intake manifold coupled to an engine and a vacuum port located in said intake manifold and in an air flow path downstream of a throttle body, the vacuum port including a molded flow disruptor including a cross-beam traversing an outlet of the vacuum port. The intake system may further include a vacuum passage coupling the vacuum port to a vehicle subsystem.

Abstract: A composite material intake manifold cover includes braces integral to the outside surface of the cover to stiffen the cover and reduce noise and vibration associated with the cover. The cover has a flange around the periphery with a raised weld bead, the weld bead provided for welding the cover to a mating piece. The flange extends outwardly from the cover for a first distance over most of the periphery and a second distance to support the braces over the remainder of the periphery. The braces extend upwardly from the upper surface of the flange at the sections of the flange extending out the second distance and may be placed between adjacent intake runner ports. By providing portions of the flange extending out a greater distance, a more substantial brace can be supported, thereby improving the noise and vibration characteristics relative to conventional stiffening ribs.

Abstract: An intake assembly for a 3-cylinder, V-configured engine comprises an intake manifold configured to conduct combustion air to a first, two-cylinder, cylinder head housing assembly and a second, single-cylinder, cylinder head housing assembly. A centrally extending plenum defines a plenum axis. A first plurality of intake runners, in fluid communication with the plenum, extend from a front side and transition through a circumferential arc around an upper side to deliver combustion air to, the first, two-cylinder, cylinder head housing assembly. A single intake runner, in fluid communication with the centrally extending plenum, extends from a rear side and transitions through a circumferential arc around the upper side to deliver combustion air to, the second, single-cylinder, cylinder head housing assembly. A zip tube delivers combustion air to the central plenum at a location that is between one of the first plurality of intake runners and the single cylinder intake runner.

Abstract: An intake manifold includes a surge tank chamber, a plurality of branch passages and a gas tank chamber capable of introducing a gas and distributing the gas into the plurality of branch passages. The gas is to be refluxed to an engine.

Abstract: An intake apparatus for an internal combustion engine comprises an intake manifold (1) with air feeding passages (3) adapted to be connected to and feed air to cylinders of an engine; a rotary valve (10) including a plurality of valve portions (11) in communication with the air feeding passages (3) through feed switch openings (7); a sealing member (60) fitted to the valve portion, the sealing member including ring portions (61) and interconnecting portions interconnecting the ring portions, recessed portions (76) defined on an outer side of the valve portions for receiving engaging portions (64) on inner sides of the interconnecting portions of the sealing members, wherein when the rotary valve is in the closed position, a first sealing gap (A) between the engaging portion and an inner face (77) of the recessed portion is set smaller than a valve gap (C) between the valve portion and the bore portion (8).

Abstract: An air intake device 40 comprises: a surge tank 44 having an upper tank chamber 50, a lower tank chamber 52, and a communication portion 56; a first intake pipe 46 having communication with the upper tank chamber 50; a second intake pipe 48 having communication with the lower tank chamber 52; and a valve 58 disposed in the lower tank chamber 52, the valve 58 being displaced between a closed position, in which an internal space of the lower tank chamber 52 is divided into a main space 60 having communication with the second intake pipe 48 and a sub-space 62 facing the communication portion 56, and an open position, in which the main space 60 and the sub-space 62 are integrated with each other.

Abstract: An intake manifold for a multiple-cylinder internal combustion engine has a collective part forming an intake gas distribution chamber, and a branch part forming branch intake passages. The collective part includes a first section defining a first space joined to a second section defining a second space. The first and second spaces define the intake gas distribution chamber. The first and second sections have corner parts, the second section being provided with a guide wall covering the inside surfaces of the corner parts. The guide wall has a guide surface and opposes the intake gas inlet, the intake gas distribution chamber being defined between the intake gas inlet and the guide wall. The guide wall and the corner parts define a back space communicating with the intake gas distribution chamber.

Abstract: The present invention provides an intake manifold that improves the intake performance and has a reduced weight. The intake manifold includes a surge tank and intake pipes. Each intake pipe has an inlet port that is connected to the surge tank. The inlet ports are arranged along a flow direction of air drawn into the surge tank from the opening of the surge tank, and project into the surge tank along direction that intersects the flow direction. Each adjacent pair of the inlet ports are separated only by a single common pipe wall.

Abstract: An internal combustion engine has a plurality of cylinders and an air intake system. The air intake system is formed from at least one distributor pipe, a plurality of intake pipes, and at least one plenum. The plenum is located between the distributor pipe and the intake pipes. Here, the combustion air is fed to the air intake system via an air guiding duct which opens out into the distributor pipe. The charge pressure of the combustion air is reduced between the outlet out of the compressor and the inlet into the combustion chamber of the internal combustion engine. A distributor pipe length is dimensioned as a function of an equivalent distributor pipe diameter such that it is possible for a reduction in the charge pressure to be obtained within the air intake system by way of an expansion, with the expansion taking place partially in the plenum in the respective intake pipe and/or within the distributor pipe.

Abstract: An intake manifold for an engine includes a plurality of intake distribution pipes arranged in a side-by-side relation to one another; an intake inlet pipe provided in an end wall and arranged in a direction of the intake distribution pipes; a surge chamber provided inside the intake manifold, and providing communication between the intake inlet pipe and the intake distribution pipes; and an intake guide wall provided integrally with the intake manifold. The intake guide wall extending in the direction in which the intake distribution pipes are arranged. One surface of the intake guide wall is smooth-and-flat and the other side surface of the intake guide wall includes a plurality of thinned concave parts separated by a plurality of ribs provided between the concave parts.

Abstract: An intake passage is formed by connecting an upper case 10 and a lower case 20 of an intake manifold. The lower case 10 has a recessed portion 50 on part of an inner surface 17a of a side wall 17. The recessed portion 50 has a deep surface 53 to which a negative pressure outlet port 42 opens, and an opening 51 opened upwards is provided in an upper portion of the recessed portion 50 in a position which opposes to the upper case 20 in a vertical direction A0. The upper case 20 has a projecting portion 60 which extends further downwards towards the negative pressure outlet port 42 than mating surfaces 10a, 20a and projects into the recessed portion 50 through an opening 52. The projecting portion 60 is positioned between the negative pressure outlet port 42 and the inner surface 17a in a horizontal direction A1.

Abstract: An intake passage is formed by connecting upper and lower cases 10, 20 of an intake manifold. The lower case 10 has a recessed portion 50 on an inner surface 17a. The recessed portion 50 has a deep surface 53 to which a negative pressure outlet port 42 opens, and an opening 51 is provided in an upper portion of the recessed portion 50. The upper case 20 has a projecting portion 60 extending further downwards towards the negative pressure outlet port 42 than mating surfaces 10a, 20a and projects into the recessed portion 50 through an opening 52. The projecting portion 60 is positioned above the negative pressure outlet port 42 and between the negative pressure outlet port 42 and the inner surface 17a. A lower end portion 63 of the projecting portion 60 is formed into an arc-like shape of which central portion 65 projects downwards.

Abstract: A variable intake system may include intake runners that are respectively connected to a plurality of cylinders to supply air that flows therein to the cylinders, a plenum, one side of which is connected to the intake runners and distributes the air to the intake runners, a first resonance pipe, one end of which is connected to the other side of the plenum to supply the air therein, a second resonance pipe, one end of which is connected to the other side of the plenum to supply the air therein, the length thereof being shorter than that of the first resonance pipe and the cross-section thereof being wider than that of the first resonance pipe, and a junction pipe connected to the other ends of the first and second resonance pipes and supplying the air to the first and second resonance pipes respectively from an intake line.

Abstract: An intake manifold is provided with partitions which divide the lower space formed under opening ends. An intake air is prevented from flowing into the lower space by the partitions. Since the intake air can be efficiently suctioned to each opening ends, pressure loss of the intake air can be reduced.

Abstract: An air intake manifold assembly includes an air intake manifold and a insert that is permanently bonded to an inner surface of the air intake manifold. By bonding the insert to the manifold, a dead space is formed between the insert and the manifold, which reduces the plenum volume within the manifold.

Abstract: An intake assembly, such as a supercharger assembly, is provided for an internal combustion engine. The intake assembly includes a housing having a wall defining an inlet passage through which intake air enters the intake assembly. A plurality of stiffening ribs is provided on the wall opposite the inlet passage and at least partially defines at least one cavity. A plate is mounted to the wall of the housing and further defines the at least one cavity. The wall defines at least one orifice configured to provide communication between the inlet passage and the at least one cavity. The at least one cavity and the at least one orifice cooperate to form at least one resonator. A method of forming the intake assembly having integral resonators is also provided.

Abstract: An engine intake control system that includes a first intake passage that has an upstream end portion and a downstream end portion opening in a surge chamber, a second intake passage that has an upstream end portion opening in the surge chamber so as to oppose the downstream end portion of the first intake passage across a gap, and a sleeve-shaped valve body slidably fitted around the downstream end portion of the first intake passage and moving between a first position in which it is distanced from the upstream end portion of the second intake passage and a second position in which it is in contact with the upstream end portion, wherein a linear motion guide bearing system is provided between an intake manifold and the valve body, a rail of the linear motion guide bearing system extending in a direction of movement of the valve body is secured to a support post fixedly provided on the intake manifold, and a slider movably straddle-mounted on the rail is secured to the valve body.

Abstract: An intake manifold (1) having a plurality of branch pipes (11) that link intake ports of an internal combustion engine and a surge tank (2) has rib portions (4) that extend from a surge tank surface (2a) to the branch pipes (11) and that link the surge tank surface (2a) and the branch pipes (11). In the surge tank (2), at least a portion of the surge tank surface (2a) that intersects with a center line of each branch pipe (11) faces an outer peripheral surface of each branch pipe (11). The rib portions (4) include at least parallel portions (4a) that extend substantially parallel with a center line of each branch pipe (11).

Abstract: An intake system is provided for a barrel internal combustion engine. The intake system includes a main air inlet, an intake plenum for a plurality of combustion cylinders, a first throttle, a second throttle and a control unit. The first throttle is operative to control a flow of air from the main air inlet, through a charging unit, and to the intake plenum. The second throttle is operative to control a flow of air from the air inlet to the intake plenum. The control unit controls the operation of the first and second throttles in supercharged or normally aspirated modes, where the first throttle operates as a main throttle and the second throttle is closed in the supercharged mode, and where the first throttle is closed and the second throttle operates as the main throttle in the naturally aspirated mode.

Abstract: The present invention is to provide a synthetic weld body which sectional shape of a passage to a bore can be an ideal shape by welding two synthetic members. The edge at the passage side of the rising boundary line 78a-1, 78a-2, 78b-1, 78b-2, 78c-1, 78c-2, 78d-1, 78d-2 which is the boundary between the top end connecting face and the mount connecting face of the middle member 70 is disposed at or in the vicinity of a contact point of the tangent line of the ridge line 84 of the mount connecting face at the passage side with the inner edge of the top end connecting face 74a, 74b, 74c, 74d at the bore 50a, 50b, 50c, 50d side. The rising boundary line 78a-1, 78a-2, 78b-1, 78b-2, 78c-1, 78c-2, 78d-1, 78d-2 including the edge at the passage side is parallel to the standard direction for vibration.

Abstract: An air intake device 40 comprises: a surge tank 44 having an upper tank chamber 50, a lower tank chamber 52, and a communication portion 56; a first intake pipe 46 having communication with the upper tank chamber 50; a second intake pipe 48 having communication with the lower tank chamber 52; and a valve 58 disposed in the lower tank chamber 52, the valve 58 being displaced between a closed position, in which an internal space of the lower tank chamber 52 is divided into a main space 60 having communication with the second intake pipe 48 and a sub-space 62 facing the communication portion 56, and an open position, in which the main space 60 and the sub-space 62 are integrated with each other.

Abstract: An internal combustion engine has a plurality of cylinders and an air intake system. The air intake system is formed from at least one distributor pipe, a plurality of intake pipes, and at least one plenum. The plenum is located between the distributor pipe and the intake pipes. Here, the combustion air is fed to the air intake system via an air guiding duct which opens out into the distributor pipe. The charge pressure of the combustion air is reduced between the outlet out of the compressor and the inlet into the combustion chamber of the internal combustion engine. A distributor pipe length is dimensioned as a function of an equivalent distributor pipe diameter such that it is possible for a reduction in the charge pressure to be obtained within the air intake system by way of an expansion, with the expansion taking place partially in the plenum in the respective intake pipe and/or within the distributor pipe.