Abstract: An airflow control valve structure includes a metallic pivot shaft-and a valve body. The valve body includes a connection portion connected to the pivot shaft and a resin valve portion. The pivot shaft includes first and second pivot shaft side press-fit portions. The connection portion includes a first valve side press-fit portion formed integrally with the valve portion and a metallic fitting member including a second valve side press-fit portion. The first valve side press-fit portion is fitted to the first pivot shaft side press-fit portion at an angular position at which a phase of the valve portion is matched with a phase of the pivot shaft. The second valve side press-fit portion is fitted to the second pivot shaft side press-fit portion. The first pivot shaft side press-fit portion is longer than the second valve side press-fit portion.

Abstract: An intake device for an internal combustion engine includes a valve body and a holding member. The valve body includes a pivot shaft and a valve portion configured to change a passage cross-sectional area of an intake passage. The holding member includes a support portion that pivotally supports the pivot shaft and accommodates the valve body. The holding member is arranged in an inner wall surface of the intake passage. The valve body includes a side wall located between the pivot shaft and the valve portion. The side wall closes a gap between the pivot shaft and the support portion around an entire circumference of the pivot shaft from the intake passage in an axial direction of the pivotal shaft.

Abstract: An airflow control valve structure includes a metal connecting shaft and a plastic valve body. The connection shaft includes an embedded portion. The connecting shaft is configured to rotate about a rotation axis. The embedded portion is embedded so that the valve body rotates integrally with the connecting shaft. The airflow control valve structure further includes a rotation restriction portion and a movement restriction portion. The rotation restriction portion is located on the embedded portion and restricts rotation of the embedded portion relative to the valve body. The movement restriction portion is located on the embedded portion and restricts movement of the embedded portion relative to the valve body in a direction along the rotation axis.

Abstract: An airflow control valve structure includes a metallic pivot shaft- and a valve body. The valve body includes a connection portion connected to the pivot shaft and a resin valve portion. The pivot shaft includes first and second pivot shaft side press-fit portions. The connection portion includes a first valve side press-fit portion formed integrally with the valve portion and a metallic fitting member including a second valve side press-fit portion. The first valve side press-fit portion is fitted to the first pivot shaft side press-fit portion at an angular position at which a phase of the valve portion is matched with a phase of the pivot shaft. The second valve side press-fit portion is fitted to the second pivot shaft side press-fit portion. The first pivot shaft side press-fit portion is longer than the second valve side press-fit portion.

Abstract: An air intake device includes: an air intake valve provided so as to change intake air by rotation of a rotation shaft; an actuator which is a driving source for rotating and driving the rotation shaft of the air intake valve; a first link member rotatable by a predetermined operation angle about the rotation shaft; a second link member rotatably connected to the first link member; a connection member which connects the first link member and the second link member so as to be rotatable to each other; and a biasing member whose one side end is engaged to the first link member and whose other side end is engaged to the second link member or the connection member to bias the first link member and the second link member or the connection member so that rattling between the first link member and the second link member is suppressed.

Abstract: A structure of an air flow control valve includes: valve main body portions respectively provided in intake ports, and controlling the flow of a fluid supplied to combustion chambers of an internal combustion engine; connecting shafts provided integrally with the valve main body portions, and connecting the valve main body portions; a first bearing member formed of a single member having a first bearing hole turnably supporting the connecting shaft at a first end; and a second bearing member provided separately from the first bearing member, and formed of a single member having a second bearing hole turnably supporting the connecting shaft at a second end. The connecting shafts are formed integrally with the valve main body portions in a state where the first and second bearing members are respectively fitted onto the connecting shafts connecting the valve main body portions.

Abstract: An air intake device includes: an air intake valve provided so as to change intake air by rotation of a rotation shaft; an actuator which is a driving source for rotating and driving the rotation shaft of the air intake valve; a first link member rotatable by a predetermined operation angle about the rotation shaft; a second link member rotatably connected to the first link member; a connection member which connects the first link member and the second link member so as to be rotatable to each other; and a biasing member whose one side end is engaged to the first link member and whose other side end is engaged to the second link member or the connection member to bias the first link member and the second link member or the connection member so that rattling between the first link member and the second link member is suppressed.

Abstract: The present invention provides an intake control device that appropriately restricts the flow of intake air when a valve body is set to a restriction position while the valve body is smoothly operated. The valve body is configured such that it is supported so as to be capable of swinging with respect to a sleeve, and when the valve body is set to the restriction position, a main valve portion of the valve body is lifted upward from a bottom plate, and a secondary valve portion of the valve body is sunk into an accommodating space of the bottom plate. In the accommodating space, a stepped portion that allows outward displacement from an inner surface of the sleeve is formed, and a seal portion that is brought closer to the stepped portion when the valve body is set to the restriction position is formed in the secondary valve portion.

Abstract: A structure of an air flow control valve includes: valve main body portions respectively provided in intake ports, and controlling the flow of a fluid supplied to combustion chambers of an internal combustion engine; connecting shafts provided integrally with the valve main body portions, and connecting the valve main body portions; a first bearing member formed of a single member having a first bearing hole turnably supporting the connecting shaft at a first end; and a second bearing member provided separately from the first bearing member, and formed of a single member having a second bearing hole turnably supporting the connecting shaft at a second end. The connecting shafts are formed integrally with the valve main body portions in a state where the first and second bearing members are respectively fitted onto the connecting shafts connecting the valve main body portions.

Abstract: The present invention provides an intake control device that appropriately restricts the flow of intake air when a valve body is set to a restriction position while the valve body is smoothly operated. The valve body is configured such that it is supported so as to be capable of swinging with respect to a sleeve, and when the valve body is set to the restriction position, a main valve portion of the valve body is lifted upward from a bottom plate, and a secondary valve portion of the valve body is sunk into an accommodating space of the bottom plate. In the accommodating space, a stepped portion that allows outward displacement from an inner surface of the sleeve is formed, and a seal portion that is brought closer to the stepped portion when the valve body is set to the restriction position is formed in the secondary valve portion.

Abstract: An airflow control apparatus does not impede fluid flow and does not reduce intake efficiency even when a flow passage area is decreased by the valve area. The airflow control apparatus includes a housing whose interior forms a fluid passage, bushes attached to the housing interior, a shaft held by the bushes, and a valve attached to the housing interior and rotatable in synchronization with the shaft. The passage includes an upstream passage, a dead band, and a downstream passage. Bush attachment grooves are provided in a portion of the passage. The bottom surface of the bush attachment grooves include an opening. The bushes are rotatably fitted to the opening and are attached to the housing interior. A first cross section perpendicular to a flow direction in the upstream passage has a larger cross-sectional area than a second cross section perpendicular to the flow direction in the downstream passage.

Abstract: An air intake apparatus for an internal combustion engine includes an intake manifold adapted for being connected to an engine head, the intake manifold including therein an intake passage through which a stream of fuel-air mixture passes and a receiving portion formed at an inner circumferential surface of the intake passage, the receiving portion being at a downstream side of stream of fuel-air mixture; a valve open/close mechanism including a cartridge made of resin, an open/close valve accommodated in the cartridge, and a shaft for rotating the open/close valve, the cartridge defining a first clearance with the receiving portion and defining a second clearance with the engine head; and a first elastic member arranged between the engine head and the cartridge of the valve opening/closing mechanism for elastically retaining the cartridge in an upstream direction of the stream of fuel-air mixture.

Abstract: An intake device for internal combustion engines includes a casing, a shaft body rotatably supported on the casing, a valve element arranged in an intake passage of the casing, and an actuator that operatively turns the valve element through the shaft body. The shaft body includes plural outer peripheral surfaces, and is inserted through a hole in the valve element. A wall surface of the hole includes a first support region and a second support region supporting different outer peripheral surface portions of the shaft body. The first support region includes plural first wall surfaces, at least one of which is different in circumferential length than the remaining first wall surfaces. The second support region includes plural second wall surfaces, at least one of which is different in circumferential length than the remaining second wall surfaces.

Abstract: An air intake apparatus for an internal combustion engine includes an intake manifold adapted for being connected to an engine head, the intake manifold including therein an intake passage through which a stream of fuel-air mixture passes and a receiving portion formed at an inner circumferential surface of the intake passage, the receiving portion being at a downstream side of stream of fuel-air mixture; a valve open/close mechanism including a cartridge made of resin, an open/close valve accommodated in the cartridge, and a shaft for rotating the open/close valve, the cartridge defining a first clearance with the receiving portion and defining a second clearance with the engine head; and a first elastic member arranged between the engine head and the cartridge of the valve opening/closing mechanism for elastically retaining the cartridge in an upstream direction of the stream of fuel-air mixture.

Abstract: An airflow control apparatus includes a housing for being provided at an air intake passage of an engine and having a passage for allowing an intake air to flow therethrough, a shaft rotatably provided at the housing to extend across the air intake passage, and a valve body provided in the housing to rotate together with the shaft, wherein an opposing surface is provided at the passage to face a circumferential end portion of the valve body when the valve body is in a closing state, and a first inclined surface formed at a portion of the opposing surface extending in an inner circumferential direction of the passage.

Abstract: A valve operating mechanism includes a valve body provided at an air passage of an internal combustion engine, an actuator causing the valve body to rotate so as to adjust a cross-sectional area of the air passage, a shaft body supporting the valve body, a link member connected to the shaft body and integrally rotating with the valve body, an actuator rod rotatably connected to the link member and transmitting a driving force of the actuator to the link member, and a biasing member arranged between the link member and the actuator rod and biasing the link member and the actuator rod so as to contact each other.

Abstract: A valve operating mechanism includes a valve body provided at an air passage of an internal combustion engine, an actuator causing the valve body to rotate so as to adjust a cross-sectional area of the air passage, a shaft body supporting the valve body, a link member connected to the shaft body and integrally rotating with the valve body, an actuator rod rotatably connected to the link member and transmitting a driving force of the actuator to the link member, and a biasing member arranged between the link member and the actuator rod and biasing the link member and the actuator rod so as to contact each other.

Abstract: An exhaust gas sealing system for a turbocharger includes a control valve for controlling a flow of an exhaust gas in a turbine housing, a shaft extending to an outside of the turbine housing through a bearing bore provided on the turbine housing, one end of the shaft being fixed to the control valve, and a sealing member for preventing the exhaust gas from leaking to the outside of the turbine housing through a gap formed between the bearing bore and the shaft. The sealing member includes a through-hole forming a gap with the shaft smaller than a gap formed between the bearing bore and the shaft. One side of the sealing member is pressed against a sealing face and is provided within a cavity formed in the turbine housing and including the sealing face on a peripheral side of the shaft.

Abstract: An exhaust gas sealing system for a turbocharger includes a control valve for controlling a flow of an exhaust gas in a turbine housing, a shaft extending to an outside of the turbine housing through a bearing bore provided on the turbine housing, one end of the shaft being fixed to the control valve, and a sealing member for preventing the exhaust gas from leaking to the outside of the turbine housing through a gap formed between the bearing bore and the shaft. The sealing member includes a through-hole forming a gap with the shaft smaller than a gap formed between the bearing bore and the shaft. One side of the sealing member is pressed against a sealing face and is provided within a cavity formed in the turbine housing and including the sealing face on a peripheral side of the shaft.