Straddle-type vehicle

A straddle vehicle comprising:

• an engine which generates driving power for allowing the straddle vehicle to travel and emits an exhaust gas;
• an exhaust device including:
• a catalyst which contacts the exhaust gas to clean the exhaust gas,
• an inner tube in which the catalyst is disposed in an inner passage thereof through which the exhaust gas flows, the inner tube extending to a location that is downstream of the catalyst, in a flow direction of the exhaust gas;
• and
• an outer tube which covers an outer peripheral surface of at least a region of the inner tube in an axial direction of the inner tube, and has a muffling space through which the exhaust gas discharged from an exit of the inner tube is flowed to reduce an exhaust noise radiated from the engine;
• at least one exhaust pipe through which the exhaust gas emitted from the engine is led to the catalyst;
• and
• a downstream oxygen sensor which is disposed to detect an oxygen concentration of the exhaust gas flowing through the inner passage of the inner tube after flowing through the catalyst, at a location that is downstream of the catalyst in the inner passage of the inner tube,
• wherein the downstream oxygen sensor includes an oxygen detecting section which detects the oxygen concentration of the exhaust gas,
• wherein the outer tube is provided with a first insertion hole into which the downstream oxygen sensor is insertable,
• wherein the inner tube is provided with a second insertion hole into which the downstream oxygen sensor is insertable,
• wherein in a state in which the downstream oxygen sensor is inserted into the first insertion hole, the oxygen detecting section is exposed in the inner passage of the inner tube,
• wherein a pipe member having an insertion space into which the downstream oxygen sensor is insertable, is joined to a peripheral edge of the second insertion hole of the inner tube and a peripheral edge of the first insertion hole of the outer tube,
• wherein the exhaust device has a structure in which a displacement of each of a first joining portion of the outer tube and a second joining portion of the inner tube, from a reference position, is permissible, the first joining portion and the second joining portion being joined to the pipe member, and
• wherein an amount of the permissible displacement from the reference position in the axial direction of the inner tube, of at least one of the first joining portion and the second joining portion, is set to be greater than that in a radial direction of the inner tube, of at least one of the first joining portion and the second joining portion.