Vibration insulating device with flexible diaphragm between radially outer gas chamber and radially inner liquid chamber

A vibration insulating device comprising:

• an inner cylindrical member;
• an outer cylindrical member disposed around said inner cylindrical member;
• an annular elastic member disposed between said inner and outer cylindrical members and securely connected to said inner and outer cylindrical members, respectively, said elastic member being generally coaxial with said inner cylindrical member;
• means defining an annular hollow chamber between said inner and outer cylindrical members, said annular hollow chamber being generally coaxial with said outer cylindrical member;
• an annular flexible diaphragm member at least a part of which is disposed within said hollow chamber to define, within said hollow chamber, a liquid chamber filled with a liquid and a gas chamber filled with a gas, said flexible diaphragm member being generally coaxial with said outer cylindrical member, each of said liquid and gas chambers extending throughout a periphery of said elastic member;
• and
• said annular elastic member having an annular groove formed therein which is located generally coaxial with said inner cylindrical member, said annular groove having a bottom surface located near an inner peripheral surface of said elastic member to provide a diaphragm-like section of said elastic member, said annular groove being open in an outside direction and having an annular opening at an outer peripheral surface of said annular elastic member, said annular opening being closed with said outer cylindrical member, the outer peripheral surface of said annular elastic member being securely connected with said outer cylindrical member, the inner peripheral surface of said annular elastic member being securely connected with said inner cylindrical member, said flexible diaphragm member being generally cylindrical, extending axially, and including a cylindrical central section located within said annular groove to divide inside of the annular groove into the liquid chamber and the gas chamber, said flexible diaphragm member central section having a generally C-shaped cross section to form an annular space serving as the gas chamber between said cylindrical central section and said outer cylindrical member, the liquid chamber being located on an opposite side of said central section from the gas chamber and being defined between a surface of said central section and a wall surface of said elastic member annular groove;
• and
• an annular stop member disposed generally coaxial with and projecting radially outwardly from said flexible diaphragm member central section into the gas chamber, said annular stop member being contactable with said outer cylindrical member.