Fixing structure for exhaust gas sensor of internal combustion engine
First Claim
1. A fixing structure for an exhaust gas sensor of an internal combustion engine, mounted on a saddle-type vehicle and having a single cylinder with a cylinder axis inclining forward to a substantially horizontal attitude, wherein the engine has a single cylinder head formed therein with a first exhaust port section having an upstream inlet opened and closed by a first exhaust valve, a second exhaust port section having an upstream inlet opened and closed by a second exhaust valve, and a single collective exhaust port section into which the first and second exhaust port sections merge at downstream ends thereof, and wherein the cylinder head has an exhaust gas sensor fixed to a first inner wall portion of the collective exhaust port section, with a sensing tip of the sensor positioned in the collective exhaust port section;
- wherein;
the collective exhaust port section has a second inner wall portion disposed opposite to the first inner wall portion in an upstream region relative to the exhaust gas sensor, with an exhaust gas guide part bulging out on the second inner wall portion to guide exhaust gas toward the exhaust gas sensor;
the first exhaust port section and the second exhaust port section are disposed in side-by-side arrangement in a transverse direction of the saddle-type vehicle;
the cylinder head has an exhaust gas guide wall defining therein the collective exhaust port section and extending downward from the cylinder head, the exhaust gas guide wall having an exhaust pipe connecting portion at a lowermost part thereof;
the exhaust gas guide wall together with the exhaust gas guide part extend in a direction to be offset to one side of the vehicle in the vehicle transverse direction with respect to said cylinder axis; and
the exhaust gas sensor is fixed to the exhaust gas guide wall on the other side of the vehicle in the vehicle transverse direction with respect to said cylinder axis.
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Accused Products
Abstract
A cylinder head of an internal combustion engine includes a first exhaust port section having an upstream inlet opened and closed by a first exhaust valve, a second exhaust port section having an upstream inlet opened and closed by a second exhaust valve, and a collective exhaust port section into which the first and second exhaust port sections merge at downstream ends thereof. In a fixing structure for an exhaust gas sensor, the sensor is fixed to the collective exhaust port section with its sensing tip in the port section. An exhaust gas guide part is formed, at a position upstream of the sensor, on an internal wall of the port section, opposite the internal wall to which the sensor is fixed, so as to bulge out to guide exhaust gas toward the sensor, whereby exhaust gas is effectively intermixed and directed to the sensor with resultant increased sensing accuracy.
14 Citations
17 Claims
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1. A fixing structure for an exhaust gas sensor of an internal combustion engine, mounted on a saddle-type vehicle and having a single cylinder with a cylinder axis inclining forward to a substantially horizontal attitude, wherein the engine has a single cylinder head formed therein with a first exhaust port section having an upstream inlet opened and closed by a first exhaust valve, a second exhaust port section having an upstream inlet opened and closed by a second exhaust valve, and a single collective exhaust port section into which the first and second exhaust port sections merge at downstream ends thereof, and wherein the cylinder head has an exhaust gas sensor fixed to a first inner wall portion of the collective exhaust port section, with a sensing tip of the sensor positioned in the collective exhaust port section;
- wherein;
the collective exhaust port section has a second inner wall portion disposed opposite to the first inner wall portion in an upstream region relative to the exhaust gas sensor, with an exhaust gas guide part bulging out on the second inner wall portion to guide exhaust gas toward the exhaust gas sensor; the first exhaust port section and the second exhaust port section are disposed in side-by-side arrangement in a transverse direction of the saddle-type vehicle; the cylinder head has an exhaust gas guide wall defining therein the collective exhaust port section and extending downward from the cylinder head, the exhaust gas guide wall having an exhaust pipe connecting portion at a lowermost part thereof; the exhaust gas guide wall together with the exhaust gas guide part extend in a direction to be offset to one side of the vehicle in the vehicle transverse direction with respect to said cylinder axis; and the exhaust gas sensor is fixed to the exhaust gas guide wall on the other side of the vehicle in the vehicle transverse direction with respect to said cylinder axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- wherein;
Specification