An actuator 1 includes a housing 2, an output shaft 3 projecting from the inside of the housing 2 to the outside, a motor 4 provided in the housing 2, a reduction mechanism 5 which connects the motor 4 to the output shaft 3, a magnet 61 provided for rotation integrally with the output shaft 3 inside the housing 2, a Hall effect IC 62 disposed to face the magnet 61 outside the rotation locus of the magnet 61, and a circumferential wall 25 disposed to stand from the inner wall of the housing 2 and interposed between the magnet 61 and the Hall effect IC 62.

A clearance δ between an inner peripheral surface of an attachment hole of an attachment tongue and an outer peripheral surface of a valve shaft is set to be smaller than an allowable displacement amount λ in an axial direction of a valve with respect to the attachment tongue. When a condition is satisfied in which the outer peripheral surface of the valve shaft comes into contact with a front-side periphery and a back-side periphery of the attachment hole of the attachment tongue, and in which a top surface of a valve body comes into contact with a back surface of the attachment tongue, a waste gate valve is constituted so that a metal washer becomes non-contact with a front surface of the attachment tongue.

A crank and linkage assembly for a component of a turbocharger includes a linkage having an end defining a through bore, an inner surface of the through bore defining a linkage groove therein. The crank has a pin whose outer surface defines a pin groove. A generally polygonal retaining ring of elastically deformable wire is installed partially in the linkage groove and partially in the pin groove to retain the linkage on the pin while allowing the linkage to rotate about the pin axis. Vertices of the retaining ring are in the linkage groove, while sides of the retaining ring are in the pin groove. Once the retaining ring is pre-installed in the linkage groove, the assembly can be assembled by a push-to-connect process.

Methods and systems that monitor an actuator state of wear. One or more observations are made as to one or more extremum positions of the actuator to determine a reference extremum position when the actuator is not worn. As the actuator becomes worn, the difference between a present extremum position and the reference is used to monitor actuator wear. Actuator wear may be observed to identify or predict a need for maintenance or replacement, and/or may be used in determining health impacts of control system solutions.

The present disclosure describes a drive circuit for an actuator of an actuator device. The drive circuit includes an interference suppression branch for reducing interferences. The interference suppression branch includes two conductor branches extending along a longitudinal axis and each comprising at least one conductor body. The two conductor branches extend through at least two imaginary conductor alignment sections of the interference suppression branch that are lined up in a row in an axial direction of the longitudinal axis. The two conductor branches have a first portion arranged inside a first conductor alignment section that run obliquely towards one another.

A turbocharger includes a turbine housing and a wastegate valve. The turbine housing defines a bypass passage. The turbine housing has a valve seat surface that is a flat surface that the wastegate valve contacts. The wastegate valve opens and closes the bypass passage. The wastegate valve has a valve surface that is a flat surface facing the valve seat surface. When the geometric center of the shape of an outer edge of the valve surface is called the valve center and the geometric center of the shape of an opening of the bypass passage in the valve seat surface is called the opening center, the shortest distance from the valve center to a central axis of the shaft is longer than the shortest distance from the opening center to the central axis of the shaft.

As seen in a section parallel to a central axis of a shaft and including the center of gravity of a valve surface, with respect to the center of gravity, an end of the valve surface on the side of a first shaft direction is located on the side of a first direction in a direction orthogonal to the central axis of the shaft. As seen in a section orthogonal to the central axis of the shaft and including the center of gravity when the central axis of the shaft and a central axis of a through-hole coincide with each other, with respect to the center of gravity, an end of the valve surface on the side of a second direction in a direction along the valve seat surface is located on the side of the first direction in a direction orthogonal to the valve seat surface.

A turbocharger includes a turbine housing and a wastegate valve. The turbine housing defines two bypass passages. The wastegate valve opens and closes the two bypass passages. The turbine housing has a valve seat surface that is a flat surface that the wastegate valve contacts. The wastegate valve has a valve surface and a depression. The valve surface is a flat surface that faces the valve seat surface when the wastegate valve is in a closed state. The depression is depressed from the valve surface. The depression is located at a portion that faces a region located between openings of the two bypass passages when the wastegate valve is in the closed state.

A bypass valve assembly for a turbocharger includes a bypass valve having a valve stem rotatable about a valve stem axis for opening and closing the valve. The end of a first crank of an articulated two-bar linkage is connected to the valve stem. The end of a second crank of the linkage is connected to a cam follower engaged with a guide cam. An actuator provides motive force to the cam follower to proceed along the guide cam, which is configured to advance the cam follower along a guide path that is non-linear and non-circular arc, causing the two-bar linkage to rotate the valve stem. Valve stem angular displacement versus actuator stroke can be altered by modification of the shape of the guide path.

The invention relates to a wastegate actuator mechanism comprising an elongated link plate and a pin which are rotatable relative to each other. The wastegate actuator mechanism further comprises a sliding assembly including a bushing fixedly connected to the link plate and a sleeve fixedly connected to the pin. Assembly of the wastegate actuator mechanism involves pressing the bushing into the eye of the link plate and allowing material of the link plate to deform and to be received in recessed portions of the bushing in the process and/or arranging the sleeve on the pin and allowing material of the pin to deform and to be received in recessed portions of the sleeve in a process of forming an end section of enlarged diameter on the pin.