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 cylinder with a cylinder axis inclining forward to a substantially horizontal attitude, wherein the engine has a cylinder head formed 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 the collective exhaust port section has an exhaust pipe connecting portion at a downstream end thereof;
- and wherein the cylinder head has an exhaust gas sensor fixed to an inner wall of the collective exhaust port section, with a sensing tip of the sensor positioned in the collective exhaust port section;
characterized in that;
the collective exhaust port section has a second inner wall opposite to the first-mentioned inner wall to which the exhaust gas sensor is fixed, and the second inner wall is formed thereon, in an upstream region relative to the exhaust gas sensor, with an exhaust gas guide part bulging out on the second inner wall 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 is so formed as to extend in a direction to offset to one side of the vehicle in the vehicle transverse direction with respect to said cylinder axis of the engine; 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.
15 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 cylinder with a cylinder axis inclining forward to a substantially horizontal attitude, wherein the engine has a cylinder head formed 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 the collective exhaust port section has an exhaust pipe connecting portion at a downstream end thereof;
- and wherein the cylinder head has an exhaust gas sensor fixed to an inner wall of the collective exhaust port section, with a sensing tip of the sensor positioned in the collective exhaust port section;
characterized in that;the collective exhaust port section has a second inner wall opposite to the first-mentioned inner wall to which the exhaust gas sensor is fixed, and the second inner wall is formed thereon, in an upstream region relative to the exhaust gas sensor, with an exhaust gas guide part bulging out on the second inner wall 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 is so formed as to extend in a direction to offset to one side of the vehicle in the vehicle transverse direction with respect to said cylinder axis of the engine; 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)
- and wherein the cylinder head has an exhaust gas sensor fixed to an inner wall of the collective exhaust port section, with a sensing tip of the sensor positioned in the collective exhaust port section;
Specification