ADJUSTABLE HYDRAULICALLY DAMPED MOUNT FOR A PISTON ENGINE

摘要

A hydraulically damped support such as a piston engine motor mount has a liquid filled working chamber which communicates with a compensation chamber through a connecting passage. The effective length of the connecting passage may be controlled by an adjustable lateral discharge valve which is positioned intermediate the discharge ends and in the wall of the passage. The distance of the lateral discharge valve from these discharge ends is selected so that when the valve is open the volume of liquid contained in the effective length of the passage, is caused to reciprocate in an oscillatory movement which is substantially in phase with the vibration of the load bearing support of the mount (at idle motor speed). When the valve is closed the effective length of the passage is increased and lower frequency vibrations (stutter frequencies) can be damped, with the oscillatory movement in counter phase to that of the load bearing support.