PURPOSE: To reduce a noise due to vibration of an engine, by vertically extensibly forming beads to the side of an oil pan of the engine and placing top end parts of said beads in a position between plural tightening members.
CONSTITUTION: Plural beads 5 are vertically extensibly formed in parallel to the side of an oil pan 1, mounted to a lower part of an engine E by tightening members 2, and upper end parts 5a of the beads are provided in such a manner as to be positioned between the tightening members 2. Since the beads 5 are formed vertically to the side, rigidity of the oil pan can be improved as a whole to eliminate low frequency vibration. While the upper end 5a of each bead 5 is provided to be positioned between the respective tightening members and rigidy of the peripheral part of the tightening member 2 can be low maintained, then its damping effect eliminates high frequency vibration to reduce transmission of the high frequency vibration to the bead 5.
KAMIMURA MASANORI
MISUMI MASANORI
