Exhaust system for internal combustion engine

An exhaust system for an internal combustion engine, comprising:

• a housing that includes a flow passage through which exhaust gas from the engine flows;
• a valve that includes:
• a valving element configured to open or close the flow passage;
• and
• a valve stem supporting the valving element;
• an actuator that includes:
• a motor configured to generate power for driving the valve upon supply of electric power to the motor;
• and
• an output member configured to transmit the power generated by the motor to the valving element via the valve stem, wherein:
• the valve and the actuator are incorporated in the housing;
• and
• the output member includes:
• an output gear configured to receive the power of the motor so as to rotate;
• an output shaft disposed on a central axis of the rotation of the output gear and coupled with the output gear to be rotatable integrally with the output gear;
• and
• a follower disposed eccentrically relative to the central axis of the rotation of the output shaft and connected to the output shaft to be rotatable integrally with the output shaft;
• a first accommodating chamber that accommodates at least the valve stem and the follower;
• and
• a second accommodating chamber that accommodates at least the motor and the output gear, wherein:
• the housing further includes a housing wall that divides the first accommodating chamber from the second accommodating chamber;
• and
• 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.