Vibration and noise proofing system for a hydrostatic stepless transmission attached to a transmission case

A vibration and noise-reducing apparatus for a working vehicle, comprising:

• a hydrostatic stepless transmission having a housing;
• an input shaft extending from a first end of said hydrostatic stepless transmission to a main clutch case;
• an output shaft extending from a second end of said hydrostatic stepless transmission and to a gear transmission case;
• a vibration proofing unit connecting said hydrostatic stepless transmission to said transmission case, said vibration proofing unit including:
• an intermediate mounting member integrally molded with said housing of said hydrostatic stepless transmission, said intermediate mounting member having at least one mounting bore extending parallel to said output shaft;
• a metallic outer tube inserted into said mounting bore;
• a metallic inner tube disposed concentrically with respect to said outer tube;
• a rubber element filling an annular space defined between said outer tube and said inner tube;
• a spacer extending from said gear transmission case to a point adjacent said inner tube so as to define a space between said hydrostatic stepless transmission and said transmission case;
• a bolt insertable through said inner tube and said spacer so as to mount said intermediate mounting member to said transmission case;
• and
• vibration absorbing means mounted to said input shaft and said output shaft;
• whereby noise and vibrations of said hydrostatic stepless transmission through said input and output shaft are substantially suppressed.