Exhaust device

An exhaust device, comprising:

• a catalyst unit including a catalyst that purifies exhaust gas discharged from an engine;
• a connection pipe connected to the catalyst unit on a downstream side in a flow direction of the exhaust gas;
• an exhaust gas sensor including a detection portion that detects a state of the exhaust gas flowing inside the connection pipe;
• and
• an outer cylinder that covers an outer periphery of the connection pipe,
• wherein:
• an upstream end portion of the connection pipe is press-fitted into an outlet of the catalyst unit,
• the connection pipe is fixed to another member around the connection pipe at a position downstream of the upstream end portion,
• a peripheral surface of the connection pipe includes a first opening including an opening diameter larger than an outer diameter of the exhaust gas sensor,
• the exhaust gas sensor is fixed to the outer cylinder in a state where the detection portion is inserted into an inside of the connection pipe through the first opening,
• a portion of the outer cylinder to which the exhaust gas sensor is fixed is recessed radially inward with respect to another portion of the outer cylinder,
• the outer cylinder includes:
• an outer cylinder main body including a second opening communicating with the first opening of the connection pipe;
• and
• a lid that closes the second opening,
• the lid includes:
• a central portion including a support portion that supports the exhaust gas sensor in a state where the exhaust gas sensor is inserted into the first opening, the central portion being recessed radially inward from the outer cylinder main body;
• and
• a peripheral edge portion joined to a peripheral edge of the second opening of the outer cylinder main body.

An exhaust device, comprising:

• a catalyst unit including a catalyst that purifies exhaust gas discharged from an engine:
• a connection pipe connected to the catalyst unit on a downstream side in a flow direction of the exhaust gas;
• an exhaust gas sensor including a detection portion that detects a state of the exhaust gas flowing inside the connection pipe;
• and
• an outer cylinder that covers an outer periphery of the connection pipe,
• wherein:
• an upstream end portion of the connection pipe is press-fitted into an outlet of the catalyst unit,
• the connection pipe is fixed to another member around the connection pipe at a position downstream of the upstream end portion,
• a peripheral surface of the connection pipe includes a first opening including an opening diameter larger than an outer diameter of the exhaust gas sensor,
• the exhaust gas sensor is fixed to the outer cylinder in a state where the detection portion is inserted into an inside of the connection pipe through the first opening,
• the outer cylinder accommodates the catalyst unit and is a sound deadening chamber for reducing kinetic energy of the exhaust gas inside the outer cylinder,
• the sound deadening chamber includes:
• the outer cylinder;
• the connection pipe;
• and
• a baffle plate that connects an inner peripheral surface of the outer cylinder and an outer peripheral surface of the connection pipe and regulates the flow of the exhaust gas in a space portion between the outer cylinder and the connection pipe,
• the catalyst unit is accommodated in the outer cylinder together with the connection pipe and the baffle plate, and
• the connection pipe is supported at both ends by a support and the catalyst unit on an upstream side, the support supporting a portion of the connection pipe on a downstream side of the first opening.