Patent ID: 7284509
Filing Date: 2007-10-23
Classification: F01P,F02B,F02F

Abstract:
1. A method of vibration control supporting a cooling fan cover fixed directly by means of fixing bolts to a cylinder block of a forced-air-cooled engine at a plurality of fixing foot parts provided at a peripheral border of the fan cover, wherein said fixing foot parts are provided at certain spacing along rotation direction of the crankshaft, band-like vibration damping members are disposed between the peripheral border of the fan cover and the cylinder block in each region of the peripheral border belonging to each sector part defined between two adjacent fixing points of two adjacent fixing foot parts among said plurality of fixing foot parts respectively so that each of said damping members is pressed against the cylinder block by each region of the peripheral border when the bolts are tightened, thus two kinds of supporting constructions are combined, wherein said band-like damper members are flexible damping members each of which is disposed in an essential part of loop of vibration of the periphery for preventing generation of noise due to vibration of the fan cover with the fixing points as nodes of vibration resonating to cylinder block vibration, and wherein said band-like flexible vibration damping members are adjusted thereby to adjust elastic force and damping capacity of the damping members so that resonance of the fan cover occurs at a rotation speed of engine higher than normal rotation speed thereof.