Abstract: A body of a seal ring is in an annular shape and includes an abutment joint at a location in the circumferential direction. The opposite ends of the body forming the abutment joint include an overlapping part where one end and the other end of the body overlap each other. The overlapping part includes a step cut joint that forms an overlap in the radial direction and a lap joint that forms an overlap in the plate thickness direction. Facing faces that face each other in the plate thickness direction in the lap joint are planes extending from an inner peripheral circular arc of the seal ring up to an outer peripheral circular arc of the seal ring.

Abstract: The present disclosure provides a valve device including a housing, a shaft, a butterfly valve, and a sealing member. The butterfly valve has a disk shape and defines a groove formed on an outer circumferential surface. The butterfly valve is fixed to the shaft and housed in a passage in the housing to selectively open and close the passage. The sealing member has an annular shape and fit into the groove. The outer circumferential surface of the sealing member has an arc surface having a diameter equal to the diameter of the passage. The arc surface comes into contact with the inner wall of the passage when the passage is closed.

Abstract: A body of a seal ring is in an annular shape and includes an abutment joint at a location in the circumferential direction. The opposite ends of the body forming the abutment joint include an overlapping part where one end and the other end of the body overlap each other. The overlapping part includes a step cut joint that forms an overlap in the radial direction and a lap joint that forms an overlap in the plate thickness direction. Facing faces that face each other in the plate thickness direction in the lap joint are planes extending from an inner peripheral circular arc of the seal ring up to an outer peripheral circular arc of the seal ring.

Abstract: The present disclosure provides a valve device including a housing, a shaft, a butterfly valve, and a sealing member. The butterfly valve has a disk shape and defines a groove formed on an outer circumferential surface. The butterfly valve is fixed to the shaft and housed in a passage in the housing to selectively open and close the passage. The sealing member has an annular shape and fit into the groove. The outer circumferential surface of the sealing member has an arc surface having a diameter equal to the diameter of the passage. The arc surface comes into contact with the inner wall of the passage when the passage is closed.

Abstract: A valve apparatus performs at least one of a first operation in which an electric motor is energized in a valve-close direction and a rotation shaft is rotated until its rotation is stopped and a second operation in which the electric motor is deenergized and a valve is fully closed by a biasing force of a return spring. Thereby, a rotation angle of the rotation shaft becomes a rotation-stop angle or the rotation angle becomes in the backlash range, so that a biasing force of the return spring is not transmitted to the rotation shaft. Then, the electric motor generates a specified torque, which is less than a valve-opening torque by which the valve starts opening. Thereby, a rotation angle of the rotation shaft can be stopped at a full-close angle. The full-close angle can be made correspond to an output of a rotational angle sensor.

Abstract: In an exhaust system for an internal combustion engine, an output member is configured to transmit power generated by a motor to a valving element via a valve stem. An output shaft is disposed on a rotation central axis of an output gear and coupled with the output gear to be rotatable integrally therewith. A follower is disposed eccentrically relative to a rotation central axis of the output shaft and connected to the output shaft to be rotatable integrally therewith. A first accommodating chamber accommodates at least the valve stem and the follower. A second accommodating chamber accommodates at least the motor and the output gear. A housing includes a housing wall that divides the first chamber from the second chamber. The housing wall includes a first bearing slidably supporting the output shaft in its rotation direction, and a cylindrical first bearing holder holding outer periphery of the first bearing.

Abstract: An arm portion is integrally formed with a housing. The arm portion protrudes from the housing in such a manner as not to be in contact with a passage-forming portion and a passage-side fastening portion. The arm portion has corner portions and a drive-side fastening portion. After a heat of EGR gas is transferred to the drive-side fastening portion, the heat is transferred to the housing through the corner portions. The arm portion elongates a heat transfer pass from the EGR gas to the driving portion to increase a resistance of heat transfer. Further, the arm portion increases a heat radiation surface area to increase a heat radiation quantity. The EGR apparatus can restrict a heat transfer from the EGR gas to the driving portion.

Abstract: In an exhaust device for an internal combustion engine, a control device controls a motor based on an output signal of a sensor. The control device has a first valve position detector detecting a first valve position when a valve unit is biased to close using only a biasing force of a spring. The control device has a second valve position detector detecting a second valve position when the valve unit is biased to close using a driving force of the motor that is larger than the biasing force of the spring. The control device detects a foreign object between a valve object and a valve seat and detects a size of the foreign object based on a comparison result between the first valve position and the second valve position.

Abstract: In an exhaust system for an internal combustion engine, an output member is configured to transmit power generated by a motor to a valving element via a valve stem. An output shaft is disposed on a rotation central axis of an output gear and coupled with the output gear to be rotatable integrally therewith. A follower is disposed eccentrically relative to a rotation central axis of the output shaft and connected to the output shaft to be rotatable integrally therewith. A first accommodating chamber accommodates at least the valve stem and the follower. A second accommodating chamber accommodates at least the motor and the output gear. A housing includes a housing wall that divides the first chamber from the second chamber. The housing wall includes a first bearing slidably supporting the output shaft in its rotation direction, and a cylindrical first bearing holder holding outer periphery of the first bearing.

Abstract: An axial groove is provided in an inner peripheral wall surface of a motor case of a housing of a motor actuator, and a spring installation opening is provided to the axial groove at a location adjacent to an opening end of a motor receiving hole of the motor case, which receives a motor. A damper spring is inserted into the groove through the spring installation opening. The damper spring urges the motor against first and second ridges formed in the inner peripheral wall surface of the motor case.

Abstract: A valve apparatus performs at least one of a first operation in which an electric motor is energized in a valve-close direction and a rotation shaft is rotated until its rotation is stopped and a second operation in which the electric motor is deenergized and a valve is fully closed by a biasing force of a return spring. Thereby, a rotation angle of the rotation shaft becomes a rotation-stop angle or the rotation angle becomes in the backlash range, so that a biasing force of the return spring is not transmitted to the rotation shaft. Then, the electric motor generates a specified torque, which is less than a valve-opening torque by which the valve starts opening. Thereby, a rotation angle of the rotation shaft can be stopped at a full-close angle. The full-close angle can be made correspond to an output of a rotational angle sensor.

Abstract: An arm portion is integrally formed with a housing. The arm portion protrudes from the housing in such a manner as not to be in contact with a passage-forming portion and a passage-side fastening portion. The arm portion has corner portions and a drive-side fastening portion. After a heat of EGR gas is transferred to the drive-side fastening portion, the heat is transferred to the housing through the corner portions. The arm portion elongates a heat transfer pass from the EGR gas to the driving portion to increase a resistance of heat transfer. Further, the arm portion increases a heat radiation surface area to increase a heat radiation quantity. The EGR apparatus 1 can restrict a heat transfer from the EGR gas to the driving portion.

Abstract: A valve device includes a control valve for manipulating a communication between a first fluid channel and a second fluid channel. The valve device further includes a pressure sensor for detecting pressure in the first fluid channel. The pressure sensor is provided on a side face defining the first fluid channel. The pressure sensor has a pressure detection face directly opposed to the first fluid channel. The pressure detection face is substantially in parallel with a first axis of the first fluid channel.

Abstract: A torque-transmitting device is advantageously applied to a secondary air control valve mounted on an automotive vehicle. The device includes a gear train for reducing a rotational speed of a motor and a mechanism for converting a rotational motion to a linear motion of a valve shaft. The gear train includes a final gear coupled to the valve shaft, and the final gear includes a flange positioned at an axial end of an axis of the final gear. A coil spring for biasing the final gear toward a predetermined position is disposed next to the flange and around the axis of the final gear. Slits or holes are formed through the flange, so that holding jigs for holding the coil spring are inserted, in an assembling process, into a cylindrical space between an inner circumference of the coil spring and the axis of the final gear.

Abstract: A valve device includes a control valve for manipulating a communication between a first fluid channel and a second fluid channel. The valve device further includes a pressure sensor for detecting pressure in the first fluid channel. The pressure sensor is provided on a side face defining the first fluid channel. The pressure sensor has a pressure detection face directly opposed to the first fluid channel. The pressure detection face is substantially in parallel with a first axis of the first fluid channel.

Abstract: A fluid-controlled valve includes a housing, a valve, and a sealing member. The housing has an annular valve seat, which has a fluid passing hole therein. The valve sits on or is separated from the valve seat to close or open the fluid passing hole respectively. The sealing member is attached on the valve. The sealing member has a sealing lip, which is closely attached to the valve seat while the fluid passing hole is closed by the valve, to seal a gap between the valve seat and the valve. The sealing member has a load receiving portion, which contacts the valve seat while the fluid passing hole is closed by the valve, in addition to the sealing lip.

Abstract: A torque-transmitting device is advantageously applied to a secondary air control valve mounted on an automotive vehicle. The device includes a gear train for reducing a rotational speed of a motor and a mechanism for converting a rotational motion to a linear motion of a valve shaft. The gear train includes a final gear coupled to the valve shaft, and the final gear includes a flange positioned at an axial end of an axis of the final gear. A coil spring for biasing the final gear toward a predetermined position is disposed next to the flange and around the axis of the final gear. Slits or holes are formed through the flange, so that holding jigs for holing the coil spring are inserted, in an assembling process, into a cylindrical space between an inner circumference of the coil spring and the axis of the final gear.

Abstract: An axial groove is provided in an inner peripheral wall surface of a motor case of a housing of a motor actuator, and a spring installation opening is provided to the axial groove at a location adjacent to an opening end of a motor receiving hole of the motor case, which receives a motor. A damper spring is inserted into the groove through the spring installation opening. The damper spring urges the motor against first and second ridges formed in the inner peripheral wall surface of the motor case.

Abstract: An airflow control valve is composed of a housing forming an air passage therein and an electromagnetically driven valve disposed in the air passage. The valve divides the air passage into an upstream passage having an air inlet port and a downstream passage having an outlet port open to an exhaust pipe. A barrier facing an exhaust gas blown back from the exhaust pipe is formed in the downstream passage in order to reduce an amount of deposits accumulating on and around the valve due to foreign particles contained in the exhaust gas. The barrier may be a dead end space in which the exhaust gas stagnates or a wall interfering with a flow of the exhaust gas. A one-way valve may be disposed immediately downstream of the valve to prevent the exhaust gas from flowing toward the valve.

Abstract: In an idle speed control valve, an adjusting screw is inserted into a hole of a valve body and passes through a center of a coil provided in the valve body. The adjusting screw has a ring-shaped flexible projection on its outer periphery between a head portion and a threaded portion thereof to prevent a sealing material from entering. An outer diameter of the projection is equal to or slightly larger than an inner diameter of the hole. Therefore, when the adjusting screw is inserted into the hole, a peak of the projection contacts an inner wall of the hole. The projection may be integrally molded with the adjusting screw. A ring-shaped projection may be provided on a thin wall portion of the adjusting screw.