Patent ID: 9453453
Filing Date: 2016-09-27
CPC Classification: F01P,F02B,F02F,G01L

Claim Text:
1. A single-cylinder internal combustion engine for a vehicle, the single-cylinder internal combustion engine comprising: a crankcase accommodating a crankshaft; a cylinder block connected to the crankcase and including only a single cylinder provided therein; a cylinder head connected to the cylinder block; a sensor mounting boss provided on the crankcase or the cylinder block; a sensor arranged to detect knocking of the single-cylinder internal combustion engine, the sensor being mounted to the boss; and an air guide member mounted to at least a portion of the crankcase, the cylinder block, or the cylinder head, to guide air at least to the sensor mounting boss; wherein the crankcase, the cylinder block, and the cylinder head are arranged in this order from a rear to a front of the vehicle; the air guide member comprises a shroud including a suction port positioned at a side of the crankcase and arranged to allow air to flow into the shroud and covering at least a portion of the crankcase, the cylinder block, and the cylinder head but not covering at least another portion of the cylinder head, and a fan to introduce air into the shroud in association with rotation of the crankshaft; a distance between a center of the suction port and a center of the sensor mounting boss in a direction along a cylinder axis is shorter than a distance between the center of the suction port and the cylinder head in the direction along the cylinder axis; and an entire body of the single-cylinder combustion engine is configured to be cooled by air.