Exhaust gas sensor arrangement structure for motorcycle

An exhaust gas sensor arrangement structure for a motorcycle comprising:

• a vehicle body frame:
• an internal combustion engine suspended on the vehicle body frame between front and rear wheels;
• exhaust pipes extending toward a rear side in the longitudinal direction of a vehicle from a front side of the internal combustion engine in the longitudinal direction of the vehicle in a state where the exhaust pipes extend below the internal combustion engine;
• wherein the vehicle body frame includes a pair of left and right bottom frame portions extending toward a rear side in the longitudinal direction of a vehicle body while extending along both sides of a lower portion of the internal combustion engine;
• and
• exhaust gas sensors arranged on upper halves of the exhaust pipes arranged between the internal combustion engine and the bottom frame portions as viewed from a front side in the longitudinal direction of the vehicle in a state where the exhaust gas sensors are sandwiched between the internal combustion engine and the bottom frame portions as viewed from a front side in the longitudinal direction of the vehicle,
• wherein portions of the upper halves of the exhaust pipes overlap with the bottom frame portions respectively as viewed in a side view, and sensor mounting portions for the exhaust gas sensors are arranged in an overlapping range.

An exhaust gas sensor arrangement structure for a motorcycle comprising:

• exhaust pipes extending toward a rear side in the longitudinal direction of a vehicle from a front side of an internal combustion engine in the longitudinal direction of the vehicle in a state where the exhaust pipes extend below the internal combustion engine;
• a pair of left and right bottom frame portions extending toward a rear side of the motorcycle in the longitudinal direction while extending along both sides of a lower portion of the internal combustion engine;
• and
• exhaust gas sensors arranged on upper halves of the exhaust pipes arranged between the internal combustion engine and the bottom frame portions as viewed from a front side in the longitudinal direction of the motorcycle in a state where the exhaust gas sensors are sandwiched between the internal combustion engine and the bottom frame portions as viewed from a front side in the longitudinal direction of the motorcycle,
• wherein center axes of the exhaust gas sensors are arranged with upper portions thereof inclined toward the outside in the motorcycle width direction with respect to a motorcycle center vertical line in a state where the center axes are directed toward positions between the internal combustion engine and the bottom frame portion, and
• wherein a plurality of exhaust pipes are arranged in a state where the exhaust pipes extend along both left and right sides of the internal combustion engine below the internal combustion engine respectively, and the exhaust gas sensors are arranged on the exhaust pipes on both left and right sides in an inclined manner with respect to the vertical direction.