Hydraulically damped elastic motor unit

In a hydraulically damped elastic mount for vibrating equipment comprising:

• a bearing core, an annular elastic member and a bottom plate enclosing a working space for receiving hydraulic liquid;
• means for providing a variable volume equalization space in association with said working space, with said working space and said equalization space forming an enclosed receptacle for retaining received hydraulic liquid;
• two grid plates disposed between said working space and said equalization space with a first grid plate adjacent said working space and a second grid plate adjacent said equalization space, and with each grid plate having a plurality of grid openings and wherein said grid plates are arranged to have a recess therebetween;
• a thin partition member having an outer periphery and wherein said partition member is fabricated from a soft elastic material and is disposed in said recess between said grid plates for restricting fluid communication between said working space and said equalization space through said grid openings;
• means for providing a permanently open choke opening fluid passage between said working space and said equalization space;
• the improvement comprising:
• means for substantially preventing the flow of hydraulic liquid between said working space and said equalization space around the outer periphery of said partition;
• and
• said partition is provided with a plurality of cuts through its thickness each of which severs said partition without substantial removal of material with numerous said grid openings having associated therewith at least one cut whereby when the pressure of said hydraulic fluid in said working space is sufficient to force said partition into abutment with said second grid plate adjacent said equalization space and exceeds the pressure of the hydraulic fluid in said equalization space by a selected value, hydraulic fluid breaks through said cuts thereby providing additional fluid communication through said numerous grid openings in a first direction from said working space to said equalization space and when the pressure of said hydraulic fluid in said equalization space is sufficient to force said partition into abutment with said first grid plate adjacent said working space and exceeds the pressure of said hydraulic fluid in said working space by a selected value, hydraulic fluid breaks through said cuts thereby providing additional fluid communication through said numerous grid openings in a second direction from said equalization space to said working space.