| 摘要 |
<p>A noise-refraining structure for an engine crankcase includes a crankshaft, a crankcase. rolling bearings, and a disk-like spring. Inside the crankcase there are provided with two bearing seats located at two sides of the crankshaft, respectively. The roller bearings are each disposed in the bearing seats, wherein an outer race of one of the rolling bearings is loose-fitted to the bearing seat, and the inner race of the rolling bearing is press-fitted to a journal of the crankshaft. The disk-like spring is interposed between the outer race and the bearing seat, axially away from the first outer race. Therefore, subject to an axial thrust of the disk-like spring, the phenomenon of vibration and impact occurred between the rolling bearings and the crankcase when the engine is running can be avoided. This will overcome vibration and noise caused by quiver and impact, and will provide a stable and long-time engine power, and will lengthen life of use for the rolling bearings.</p> |
