To achieve attenuation characteristics having two peaks with respect to idling vibration while satisfying damping properties against engine shake and muffled sound.
A liquid sealed vibration-proof device includes: a primary fluid chamber 42 where a vibration-proof base 16 defines part of a chamber wall; a first sub fluid chamber 44 where a first diaphragm 36 defines part of the chamber wall; a second sub fluid chamber 48 sectioned from the first sub fluid chamber 44 by a second diaphragm 46; a third sub fluid chamber 52 sectioned from the first sub fluid chamber 44 by a third diaphragm 50; a first orifice passage 60 communicating the primary fluid chamber 42 with the first sub fluid chamber 44; a second orifice passage 62 tuned to a higher high frequency area and communicating the second sub fluid chamber 48 with the third sub fluid chamber 52; a third orifice passage 64 tuned to much higher high frequency area and communicating the primary fluid chamber 42 with the second sub fluid chamber 48; and a switching valve 66 opening and closing the third orifice passage 64.
OGUCHI TAKAHIRO
SAKURAI KATSUHIRO
TOYOTA MOTOR CORP
| JP2006144806A | 2006-06-08 | |||
| JP2010210045A | 2010-09-24 | |||
| JPH11294518A | 1999-10-29 | |||
| JP2004218753A | 2004-08-05 | |||
| JP2009168102A | 2009-07-30 |
Masato Tsuda
Tetsuji Nakamura
Katsuyuki Tomita