In this crankshaft support structure in an internal combustion engine, it is possible to increase the compactness of an oil pump while increasing the compactness of the internal combustion engine using a bush bearing. In the support structure of a cranksha...

The structure has a fastener (24) for mounting a sensor (25) on an outer wall (11) of a crankcase (2) below an axis (3) of a crankshaft for detecting engines driving conditions. A cover unit (29) covers the sensor and extends from an outer wall of the cran...