Abstract: An exhaust valve includes a pipe body connecting an upstream pipe and a downstream pipe for exhaust, a valve plate disposed inside the pipe body in a state of being attached to a rotary shaft that rotates by drive of an actuator, the valve plate configured to rotate to open/close an exhaust flow path inside the pipe body, and a stopper fixed inside the pipe body and configured to come into contact with the valve plate in a closed state. In the stopper, at least one of an upstream contact surface at which the valve plate makes contact and a downstream contact surface at which the valve plate makes contact runs along an inner peripheral surface of the pipe body at a position closer to an upstream side or a downstream side of the exhaust than an outer periphery of the rotary shaft.

Abstract: An exhaust valve includes a pipe body connecting an upstream pipe and a downstream pipe for exhaust, a valve plate disposed inside the pipe body in a state of being attached to a rotary shaft that rotates by drive of an actuator, the valve plate configured to rotate to open/close an exhaust flow path inside the pipe body, and a stopper fixed inside the pipe body. The stopper is a member including, formed integrally, a base portion including an insertion hole configured to receive insertion of the rotary shaft, a first contact portion extending along an inner peripheral surface of the pipe body on one side of the base portion upstream and downstream of the exhaust, and a second contact portion extending along the inner peripheral surface on another side of the base portion upstream and downstream of the exhaust, on a side opposite to the first contact portion.

Abstract: Provided is a bearing attachment structure for attaching a bearing 71, 72 that supports a rotary shaft 3 inserted into a housing. The bearing attachment structure includes a bearing case 61, 62 including a base portion 612, 622 having a substantially cylindrical shape and a flange portion 611, 621 formed to spread outward from one end portion of the base portion 612, 622 in the axial direction. The bearing 71, 72 is installed in the bearing case 61, 62. The bearing case 61, 62 is disposed by aligning the flange portion 611, 621 with respect to the housing, and the bearing case 61, 62 is welded to the housing at the flange portion 611, 621. This can greatly reduce damage to a bearing caused by welding heat and reliably prevent breakage of the bearing, deterioration of lubricant on the bearing, and a reduction in service life of the bearing.