Vibration isolating devices

#This invention relates to a vibration isolating device suitable for use in an automobile and other vehicles, machinery instruments and the like, which serves to sufficiently damp low frequency, large amplitude vibrations but also to effectively insulate high frequency, small amplitude vibrations.

#The conventional known vibration isolating device widely used, for instance, as an engine mount for automobile vehicles comprises a frame body connected to a vehicle chassis, a frame body connected to an engine, an elastic member disposed between these frame bodies and contributing to the formation of a closed chamber, water or other liquid filled in the closed chamber, a partition member secured at its peripheral edge to one of the above two frame bodies and dividing the closed chamber into two liquid chambers, and a passage arranged in the partition member to communicate the two liquid chambers with each other.

#When vibration from the engine is transmitted to the vibration isolating device, it can be damped by a flow resistance subjected to the liquid when the liquid flows from the one liquid chamber to the other through the passage in addition to an internal friction of the elastic member.

#FIG. 1 is a longitudinal section view of a first embodiment of the vibration isolating device according to the invention;

#FIG. 2(a)-(c) are sectional views of various modified embodiments of the partition member, respectively;

#FIG. 3(a) and (b) are a longitudinal section view of another embodiment of the device according to the invention and a perspective view of constructional components of the partition member, respectively;

#The invention will be explained with reference to the following illustrated examples.

#In the figures, numeral 1 is a component, for example, a frame body connected to a vehicle chassis, numeral 2 another component, for example, a frame body connected to an engine, and numeral 3 an elastic member arranged between the frame bodies 1 and 2 and closely adhered thereto and contributing to the formation of a closed chamber as mentioned later.

#The frame body 1 is composed by fixing a lower end flange 6a of a cylindrical member 6 to a flange 5a of a dish-like member 5 provided at its lower surface with a fitting bolt 4 protruding downward from the central portion thereof. On the other hand, the frame body 2 is composed by securing a cup-like member 9 to a lower surface of a flat plate 8 provided at its upper surface with a fitting bolt 7 protruding upward from the central portion thereof.